arch/x86/kvm/x86.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Kernel-based Virtual Machine driver for Linux
   4  *
   5  * derived from drivers/kvm/kvm_main.c
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  * Copyright (C) 2008 Qumranet, Inc.
   9  * Copyright IBM Corporation, 2008
  10  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  11  *
  12  * Authors:
  13  *   Avi Kivity   <avi@qumranet.com>
  14  *   Yaniv Kamay  <yaniv@qumranet.com>
  15  *   Amit Shah    <amit.shah@qumranet.com>
  16  *   Ben-Ami Yassour <benami@il.ibm.com>
  17  */
  18
  19 #include <linux/kvm_host.h>
  20 #include "irq.h"
  21 #include "ioapic.h"
  22 #include "mmu.h"
  23 #include "i8254.h"
  24 #include "tss.h"
  25 #include "kvm_cache_regs.h"
  26 #include "kvm_emulate.h"
  27 #include "x86.h"
  28 #include "cpuid.h"
  29 #include "pmu.h"
  30 #include "hyperv.h"
  31 #include "lapic.h"
  32 #include "xen.h"
  33
  34 #include <linux/clocksource.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/kvm.h>
  37 #include <linux/fs.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/export.h>
  40 #include <linux/moduleparam.h>
  41 #include <linux/mman.h>
  42 #include <linux/highmem.h>
  43 #include <linux/iommu.h>
  44 #include <linux/intel-iommu.h>
  45 #include <linux/cpufreq.h>
  46 #include <linux/user-return-notifier.h>
  47 #include <linux/srcu.h>
  48 #include <linux/slab.h>
  49 #include <linux/perf_event.h>
  50 #include <linux/uaccess.h>
  51 #include <linux/hash.h>
  52 #include <linux/pci.h>
  53 #include <linux/timekeeper_internal.h>
  54 #include <linux/pvclock_gtod.h>
  55 #include <linux/kvm_irqfd.h>
  56 #include <linux/irqbypass.h>
  57 #include <linux/sched/stat.h>
  58 #include <linux/sched/isolation.h>
  59 #include <linux/mem_encrypt.h>
  60 #include <linux/entry-kvm.h>
  61 #include <linux/suspend.h>
  62
  63 #include <trace/events/kvm.h>
  64
  65 #include <asm/debugreg.h>
  66 #include <asm/msr.h>
  67 #include <asm/desc.h>
  68 #include <asm/mce.h>
  69 #include <asm/pkru.h>
  70 #include <linux/kernel_stat.h>
  71 #include <asm/fpu/internal.h> /* Ugh! */
  72 #include <asm/pvclock.h>
  73 #include <asm/div64.h>
  74 #include <asm/irq_remapping.h>
  75 #include <asm/mshyperv.h>
  76 #include <asm/hypervisor.h>
  77 #include <asm/tlbflush.h>
  78 #include <asm/intel_pt.h>
  79 #include <asm/emulate_prefix.h>
  80 #include <asm/sgx.h>
  81 #include <clocksource/hyperv_timer.h>
  82
  83 #define CREATE_TRACE_POINTS
  84 #include "trace.h"
  85
  86 #define MAX_IO_MSRS 256
  87 #define KVM_MAX_MCE_BANKS 32
  88 u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P;
  89 EXPORT_SYMBOL_GPL(kvm_mce_cap_supported);
  90
  91 #define emul_to_vcpu(ctxt) \
  92         ((struct kvm_vcpu *)(ctxt)->vcpu)
  93
  94 /* EFER defaults:
  95  * - enable syscall per default because its emulated by KVM
  96  * - enable LME and LMA per default on 64 bit KVM
  97  */
  98 #ifdef CONFIG_X86_64
  99 static
 100 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
 101 #else
 102 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
 103 #endif
 104
 105 static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS;
 106
 107 #define KVM_EXIT_HYPERCALL_VALID_MASK (1 << KVM_HC_MAP_GPA_RANGE)
 108
 109 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \
 110                                     KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
 111
 112 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
 113 static void process_nmi(struct kvm_vcpu *vcpu);
 114 static void process_smi(struct kvm_vcpu *vcpu);
 115 static void enter_smm(struct kvm_vcpu *vcpu);
 116 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 117 static void store_regs(struct kvm_vcpu *vcpu);
 118 static int sync_regs(struct kvm_vcpu *vcpu);
 119
 120 static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2);
 121 static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2);
 122
 123 struct kvm_x86_ops kvm_x86_ops __read_mostly;
 124 EXPORT_SYMBOL_GPL(kvm_x86_ops);
 125
 126 #define KVM_X86_OP(func)                                             \
 127         DEFINE_STATIC_CALL_NULL(kvm_x86_##func,                      \
 128                                 *(((struct kvm_x86_ops *)0)->func));
 129 #define KVM_X86_OP_NULL KVM_X86_OP
 130 #include <asm/kvm-x86-ops.h>
 131 EXPORT_STATIC_CALL_GPL(kvm_x86_get_cs_db_l_bits);
 132 EXPORT_STATIC_CALL_GPL(kvm_x86_cache_reg);
 133 EXPORT_STATIC_CALL_GPL(kvm_x86_tlb_flush_current);
 134
 135 static bool __read_mostly ignore_msrs = 0;
 136 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
 137
 138 bool __read_mostly report_ignored_msrs = true;
 139 module_param(report_ignored_msrs, bool, S_IRUGO | S_IWUSR);
 140 EXPORT_SYMBOL_GPL(report_ignored_msrs);
 141
 142 unsigned int min_timer_period_us = 200;
 143 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
 144
 145 static bool __read_mostly kvmclock_periodic_sync = true;
 146 module_param(kvmclock_periodic_sync, bool, S_IRUGO);
 147
 148 bool __read_mostly kvm_has_tsc_control;
 149 EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
 150 u32  __read_mostly kvm_max_guest_tsc_khz;
 151 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
 152 u8   __read_mostly kvm_tsc_scaling_ratio_frac_bits;
 153 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits);
 154 u64  __read_mostly kvm_max_tsc_scaling_ratio;
 155 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio);
 156 u64 __read_mostly kvm_default_tsc_scaling_ratio;
 157 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio);
 158 bool __read_mostly kvm_has_bus_lock_exit;
 159 EXPORT_SYMBOL_GPL(kvm_has_bus_lock_exit);
 160
 161 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
 162 static u32 __read_mostly tsc_tolerance_ppm = 250;
 163 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
 164
 165 /*
 166  * lapic timer advance (tscdeadline mode only) in nanoseconds.  '-1' enables
 167  * adaptive tuning starting from default advancement of 1000ns.  '0' disables
 168  * advancement entirely.  Any other value is used as-is and disables adaptive
 169  * tuning, i.e. allows privileged userspace to set an exact advancement time.
 170  */
 171 static int __read_mostly lapic_timer_advance_ns = -1;
 172 module_param(lapic_timer_advance_ns, int, S_IRUGO | S_IWUSR);
 173
 174 static bool __read_mostly vector_hashing = true;
 175 module_param(vector_hashing, bool, S_IRUGO);
 176
 177 bool __read_mostly enable_vmware_backdoor = false;
 178 module_param(enable_vmware_backdoor, bool, S_IRUGO);
 179 EXPORT_SYMBOL_GPL(enable_vmware_backdoor);
 180
 181 static bool __read_mostly force_emulation_prefix = false;
 182 module_param(force_emulation_prefix, bool, S_IRUGO);
 183
 184 int __read_mostly pi_inject_timer = -1;
 185 module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR);
 186
 187 /*
 188  * Restoring the host value for MSRs that are only consumed when running in
 189  * usermode, e.g. SYSCALL MSRs and TSC_AUX, can be deferred until the CPU
 190  * returns to userspace, i.e. the kernel can run with the guest's value.
 191  */
 192 #define KVM_MAX_NR_USER_RETURN_MSRS 16
 193
 194 struct kvm_user_return_msrs {
 195         struct user_return_notifier urn;
 196         bool registered;
 197         struct kvm_user_return_msr_values {
 198                 u64 host;
 199                 u64 curr;
 200         } values[KVM_MAX_NR_USER_RETURN_MSRS];
 201 };
 202
 203 u32 __read_mostly kvm_nr_uret_msrs;
 204 EXPORT_SYMBOL_GPL(kvm_nr_uret_msrs);
 205 static u32 __read_mostly kvm_uret_msrs_list[KVM_MAX_NR_USER_RETURN_MSRS];
 206 static struct kvm_user_return_msrs __percpu *user_return_msrs;
 207
 208 #define KVM_SUPPORTED_XCR0     (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
 209                                 | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
 210                                 | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \
 211                                 | XFEATURE_MASK_PKRU)
 212
 213 u64 __read_mostly host_efer;
 214 EXPORT_SYMBOL_GPL(host_efer);
 215
 216 bool __read_mostly allow_smaller_maxphyaddr = 0;
 217 EXPORT_SYMBOL_GPL(allow_smaller_maxphyaddr);
 218
 219 bool __read_mostly enable_apicv = true;
 220 EXPORT_SYMBOL_GPL(enable_apicv);
 221
 222 u64 __read_mostly host_xss;
 223 EXPORT_SYMBOL_GPL(host_xss);
 224 u64 __read_mostly supported_xss;
 225 EXPORT_SYMBOL_GPL(supported_xss);
 226
 227 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
 228         KVM_GENERIC_VM_STATS(),
 229         STATS_DESC_COUNTER(VM, mmu_shadow_zapped),
 230         STATS_DESC_COUNTER(VM, mmu_pte_write),
 231         STATS_DESC_COUNTER(VM, mmu_pde_zapped),
 232         STATS_DESC_COUNTER(VM, mmu_flooded),
 233         STATS_DESC_COUNTER(VM, mmu_recycled),
 234         STATS_DESC_COUNTER(VM, mmu_cache_miss),
 235         STATS_DESC_ICOUNTER(VM, mmu_unsync),
 236         STATS_DESC_ICOUNTER(VM, lpages),
 237         STATS_DESC_ICOUNTER(VM, nx_lpage_splits),
 238         STATS_DESC_PCOUNTER(VM, max_mmu_page_hash_collisions)
 239 };
 240 static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
 241                 sizeof(struct kvm_vm_stat) / sizeof(u64));
 242
 243 const struct kvm_stats_header kvm_vm_stats_header = {
 244         .name_size = KVM_STATS_NAME_SIZE,
 245         .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
 246         .id_offset = sizeof(struct kvm_stats_header),
 247         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
 248         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
 249                        sizeof(kvm_vm_stats_desc),
 250 };
 251
 252 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
 253         KVM_GENERIC_VCPU_STATS(),
 254         STATS_DESC_COUNTER(VCPU, pf_fixed),
 255         STATS_DESC_COUNTER(VCPU, pf_guest),
 256         STATS_DESC_COUNTER(VCPU, tlb_flush),
 257         STATS_DESC_COUNTER(VCPU, invlpg),
 258         STATS_DESC_COUNTER(VCPU, exits),
 259         STATS_DESC_COUNTER(VCPU, io_exits),
 260         STATS_DESC_COUNTER(VCPU, mmio_exits),
 261         STATS_DESC_COUNTER(VCPU, signal_exits),
 262         STATS_DESC_COUNTER(VCPU, irq_window_exits),
 263         STATS_DESC_COUNTER(VCPU, nmi_window_exits),
 264         STATS_DESC_COUNTER(VCPU, l1d_flush),
 265         STATS_DESC_COUNTER(VCPU, halt_exits),
 266         STATS_DESC_COUNTER(VCPU, request_irq_exits),
 267         STATS_DESC_COUNTER(VCPU, irq_exits),
 268         STATS_DESC_COUNTER(VCPU, host_state_reload),
 269         STATS_DESC_COUNTER(VCPU, fpu_reload),
 270         STATS_DESC_COUNTER(VCPU, insn_emulation),
 271         STATS_DESC_COUNTER(VCPU, insn_emulation_fail),
 272         STATS_DESC_COUNTER(VCPU, hypercalls),
 273         STATS_DESC_COUNTER(VCPU, irq_injections),
 274         STATS_DESC_COUNTER(VCPU, nmi_injections),
 275         STATS_DESC_COUNTER(VCPU, req_event),
 276         STATS_DESC_COUNTER(VCPU, nested_run),
 277         STATS_DESC_COUNTER(VCPU, directed_yield_attempted),
 278         STATS_DESC_COUNTER(VCPU, directed_yield_successful),
 279         STATS_DESC_ICOUNTER(VCPU, guest_mode)
 280 };
 281 static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
 282                 sizeof(struct kvm_vcpu_stat) / sizeof(u64));
 283
 284 const struct kvm_stats_header kvm_vcpu_stats_header = {
 285         .name_size = KVM_STATS_NAME_SIZE,
 286         .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
 287         .id_offset = sizeof(struct kvm_stats_header),
 288         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
 289         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
 290                        sizeof(kvm_vcpu_stats_desc),
 291 };
 292
 293 u64 __read_mostly host_xcr0;
 294 u64 __read_mostly supported_xcr0;
 295 EXPORT_SYMBOL_GPL(supported_xcr0);
 296
 297 static struct kmem_cache *x86_fpu_cache;
 298
 299 static struct kmem_cache *x86_emulator_cache;
 300
 301 /*
 302  * When called, it means the previous get/set msr reached an invalid msr.
 303  * Return true if we want to ignore/silent this failed msr access.
 304  */
 305 static bool kvm_msr_ignored_check(u32 msr, u64 data, bool write)
 306 {
 307         const char *op = write ? "wrmsr" : "rdmsr";
 308
 309         if (ignore_msrs) {
 310                 if (report_ignored_msrs)
 311                         kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n",
 312                                       op, msr, data);
 313                 /* Mask the error */
 314                 return true;
 315         } else {
 316                 kvm_debug_ratelimited("unhandled %s: 0x%x data 0x%llx\n",
 317                                       op, msr, data);
 318                 return false;
 319         }
 320 }
 321
 322 static struct kmem_cache *kvm_alloc_emulator_cache(void)
 323 {
 324         unsigned int useroffset = offsetof(struct x86_emulate_ctxt, src);
 325         unsigned int size = sizeof(struct x86_emulate_ctxt);
 326
 327         return kmem_cache_create_usercopy("x86_emulator", size,
 328                                           __alignof__(struct x86_emulate_ctxt),
 329                                           SLAB_ACCOUNT, useroffset,
 330                                           size - useroffset, NULL);
 331 }
 332
 333 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
 334
 335 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 336 {
 337         int i;
 338         for (i = 0; i < ASYNC_PF_PER_VCPU; i++)
 339                 vcpu->arch.apf.gfns[i] = ~0;
 340 }
 341
 342 static void kvm_on_user_return(struct user_return_notifier *urn)
 343 {
 344         unsigned slot;
 345         struct kvm_user_return_msrs *msrs
 346                 = container_of(urn, struct kvm_user_return_msrs, urn);
 347         struct kvm_user_return_msr_values *values;
 348         unsigned long flags;
 349
 350         /*
 351          * Disabling irqs at this point since the following code could be
 352          * interrupted and executed through kvm_arch_hardware_disable()
 353          */
 354         local_irq_save(flags);
 355         if (msrs->registered) {
 356                 msrs->registered = false;
 357                 user_return_notifier_unregister(urn);
 358         }
 359         local_irq_restore(flags);
 360         for (slot = 0; slot < kvm_nr_uret_msrs; ++slot) {
 361                 values = &msrs->values[slot];
 362                 if (values->host != values->curr) {
 363                         wrmsrl(kvm_uret_msrs_list[slot], values->host);
 364                         values->curr = values->host;
 365                 }
 366         }
 367 }
 368
 369 static int kvm_probe_user_return_msr(u32 msr)
 370 {
 371         u64 val;
 372         int ret;
 373
 374         preempt_disable();
 375         ret = rdmsrl_safe(msr, &val);
 376         if (ret)
 377                 goto out;
 378         ret = wrmsrl_safe(msr, val);
 379 out:
 380         preempt_enable();
 381         return ret;
 382 }
 383
 384 int kvm_add_user_return_msr(u32 msr)
 385 {
 386         BUG_ON(kvm_nr_uret_msrs >= KVM_MAX_NR_USER_RETURN_MSRS);
 387
 388         if (kvm_probe_user_return_msr(msr))
 389                 return -1;
 390
 391         kvm_uret_msrs_list[kvm_nr_uret_msrs] = msr;
 392         return kvm_nr_uret_msrs++;
 393 }
 394 EXPORT_SYMBOL_GPL(kvm_add_user_return_msr);
 395
 396 int kvm_find_user_return_msr(u32 msr)
 397 {
 398         int i;
 399
 400         for (i = 0; i < kvm_nr_uret_msrs; ++i) {
 401                 if (kvm_uret_msrs_list[i] == msr)
 402                         return i;
 403         }
 404         return -1;
 405 }
 406 EXPORT_SYMBOL_GPL(kvm_find_user_return_msr);
 407
 408 static void kvm_user_return_msr_cpu_online(void)
 409 {
 410         unsigned int cpu = smp_processor_id();
 411         struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
 412         u64 value;
 413         int i;
 414
 415         for (i = 0; i < kvm_nr_uret_msrs; ++i) {
 416                 rdmsrl_safe(kvm_uret_msrs_list[i], &value);
 417                 msrs->values[i].host = value;
 418                 msrs->values[i].curr = value;
 419         }
 420 }
 421
 422 int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask)
 423 {
 424         unsigned int cpu = smp_processor_id();
 425         struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
 426         int err;
 427
 428         value = (value & mask) | (msrs->values[slot].host & ~mask);
 429         if (value == msrs->values[slot].curr)
 430                 return 0;
 431         err = wrmsrl_safe(kvm_uret_msrs_list[slot], value);
 432         if (err)
 433                 return 1;
 434
 435         msrs->values[slot].curr = value;
 436         if (!msrs->registered) {
 437                 msrs->urn.on_user_return = kvm_on_user_return;
 438                 user_return_notifier_register(&msrs->urn);
 439                 msrs->registered = true;
 440         }
 441         return 0;
 442 }
 443 EXPORT_SYMBOL_GPL(kvm_set_user_return_msr);
 444
 445 static void drop_user_return_notifiers(void)
 446 {
 447         unsigned int cpu = smp_processor_id();
 448         struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
 449
 450         if (msrs->registered)
 451                 kvm_on_user_return(&msrs->urn);
 452 }
 453
 454 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 455 {
 456         return vcpu->arch.apic_base;
 457 }
 458 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 459
 460 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu)
 461 {
 462         return kvm_apic_mode(kvm_get_apic_base(vcpu));
 463 }
 464 EXPORT_SYMBOL_GPL(kvm_get_apic_mode);
 465
 466 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 467 {
 468         enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
 469         enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
 470         u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff |
 471                 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);
 472
 473         if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
 474                 return 1;
 475         if (!msr_info->host_initiated) {
 476                 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
 477                         return 1;
 478                 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
 479                         return 1;
 480         }
 481
 482         kvm_lapic_set_base(vcpu, msr_info->data);
 483         kvm_recalculate_apic_map(vcpu->kvm);
 484         return 0;
 485 }
 486 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 487
 488 asmlinkage __visible noinstr void kvm_spurious_fault(void)
 489 {
 490         /* Fault while not rebooting.  We want the trace. */
 491         BUG_ON(!kvm_rebooting);
 492 }
 493 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
 494
 495 #define EXCPT_BENIGN            0
 496 #define EXCPT_CONTRIBUTORY      1
 497 #define EXCPT_PF                2
 498
 499 static int exception_class(int vector)
 500 {
 501         switch (vector) {
 502         case PF_VECTOR:
 503                 return EXCPT_PF;
 504         case DE_VECTOR:
 505         case TS_VECTOR:
 506         case NP_VECTOR:
 507         case SS_VECTOR:
 508         case GP_VECTOR:
 509                 return EXCPT_CONTRIBUTORY;
 510         default:
 511                 break;
 512         }
 513         return EXCPT_BENIGN;
 514 }
 515
 516 #define EXCPT_FAULT             0
 517 #define EXCPT_TRAP              1
 518 #define EXCPT_ABORT             2
 519 #define EXCPT_INTERRUPT         3
 520
 521 static int exception_type(int vector)
 522 {
 523         unsigned int mask;
 524
 525         if (WARN_ON(vector > 31 || vector == NMI_VECTOR))
 526                 return EXCPT_INTERRUPT;
 527
 528         mask = 1 << vector;
 529
 530         /* #DB is trap, as instruction watchpoints are handled elsewhere */
 531         if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR)))
 532                 return EXCPT_TRAP;
 533
 534         if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR)))
 535                 return EXCPT_ABORT;
 536
 537         /* Reserved exceptions will result in fault */
 538         return EXCPT_FAULT;
 539 }
 540
 541 void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu)
 542 {
 543         unsigned nr = vcpu->arch.exception.nr;
 544         bool has_payload = vcpu->arch.exception.has_payload;
 545         unsigned long payload = vcpu->arch.exception.payload;
 546
 547         if (!has_payload)
 548                 return;
 549
 550         switch (nr) {
 551         case DB_VECTOR:
 552                 /*
 553                  * "Certain debug exceptions may clear bit 0-3.  The
 554                  * remaining contents of the DR6 register are never
 555                  * cleared by the processor".
 556                  */
 557                 vcpu->arch.dr6 &= ~DR_TRAP_BITS;
 558                 /*
 559                  * In order to reflect the #DB exception payload in guest
 560                  * dr6, three components need to be considered: active low
 561                  * bit, FIXED_1 bits and active high bits (e.g. DR6_BD,
 562                  * DR6_BS and DR6_BT)
 563                  * DR6_ACTIVE_LOW contains the FIXED_1 and active low bits.
 564                  * In the target guest dr6:
 565                  * FIXED_1 bits should always be set.
 566                  * Active low bits should be cleared if 1-setting in payload.
 567                  * Active high bits should be set if 1-setting in payload.
 568                  *
 569                  * Note, the payload is compatible with the pending debug
 570                  * exceptions/exit qualification under VMX, that active_low bits
 571                  * are active high in payload.
 572                  * So they need to be flipped for DR6.
 573                  */
 574                 vcpu->arch.dr6 |= DR6_ACTIVE_LOW;
 575                 vcpu->arch.dr6 |= payload;
 576                 vcpu->arch.dr6 ^= payload & DR6_ACTIVE_LOW;
 577
 578                 /*
 579                  * The #DB payload is defined as compatible with the 'pending
 580                  * debug exceptions' field under VMX, not DR6. While bit 12 is
 581                  * defined in the 'pending debug exceptions' field (enabled
 582                  * breakpoint), it is reserved and must be zero in DR6.
 583                  */
 584                 vcpu->arch.dr6 &= ~BIT(12);
 585                 break;
 586         case PF_VECTOR:
 587                 vcpu->arch.cr2 = payload;
 588                 break;
 589         }
 590
 591         vcpu->arch.exception.has_payload = false;
 592         vcpu->arch.exception.payload = 0;
 593 }
 594 EXPORT_SYMBOL_GPL(kvm_deliver_exception_payload);
 595
 596 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 597                 unsigned nr, bool has_error, u32 error_code,
 598                 bool has_payload, unsigned long payload, bool reinject)
 599 {
 600         u32 prev_nr;
 601         int class1, class2;
 602
 603         kvm_make_request(KVM_REQ_EVENT, vcpu);
 604
 605         if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) {
 606         queue:
 607                 if (reinject) {
 608                         /*
 609                          * On vmentry, vcpu->arch.exception.pending is only
 610                          * true if an event injection was blocked by
 611                          * nested_run_pending.  In that case, however,
 612                          * vcpu_enter_guest requests an immediate exit,
 613                          * and the guest shouldn't proceed far enough to
 614                          * need reinjection.
 615                          */
 616                         WARN_ON_ONCE(vcpu->arch.exception.pending);
 617                         vcpu->arch.exception.injected = true;
 618                         if (WARN_ON_ONCE(has_payload)) {
 619                                 /*
 620                                  * A reinjected event has already
 621                                  * delivered its payload.
 622                                  */
 623                                 has_payload = false;
 624                                 payload = 0;
 625                         }
 626                 } else {
 627                         vcpu->arch.exception.pending = true;
 628                         vcpu->arch.exception.injected = false;
 629                 }
 630                 vcpu->arch.exception.has_error_code = has_error;
 631                 vcpu->arch.exception.nr = nr;
 632                 vcpu->arch.exception.error_code = error_code;
 633                 vcpu->arch.exception.has_payload = has_payload;
 634                 vcpu->arch.exception.payload = payload;
 635                 if (!is_guest_mode(vcpu))
 636                         kvm_deliver_exception_payload(vcpu);
 637                 return;
 638         }
 639
 640         /* to check exception */
 641         prev_nr = vcpu->arch.exception.nr;
 642         if (prev_nr == DF_VECTOR) {
 643                 /* triple fault -> shutdown */
 644                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 645                 return;
 646         }
 647         class1 = exception_class(prev_nr);
 648         class2 = exception_class(nr);
 649         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 650                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 651                 /*
 652                  * Generate double fault per SDM Table 5-5.  Set
 653                  * exception.pending = true so that the double fault
 654                  * can trigger a nested vmexit.
 655                  */
 656                 vcpu->arch.exception.pending = true;
 657                 vcpu->arch.exception.injected = false;
 658                 vcpu->arch.exception.has_error_code = true;
 659                 vcpu->arch.exception.nr = DF_VECTOR;
 660                 vcpu->arch.exception.error_code = 0;
 661                 vcpu->arch.exception.has_payload = false;
 662                 vcpu->arch.exception.payload = 0;
 663         } else
 664                 /* replace previous exception with a new one in a hope
 665                    that instruction re-execution will regenerate lost
 666                    exception */
 667                 goto queue;
 668 }
 669
 670 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 671 {
 672         kvm_multiple_exception(vcpu, nr, false, 0, false, 0, false);
 673 }
 674 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 675
 676 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 677 {
 678         kvm_multiple_exception(vcpu, nr, false, 0, false, 0, true);
 679 }
 680 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 681
 682 void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr,
 683                            unsigned long payload)
 684 {
 685         kvm_multiple_exception(vcpu, nr, false, 0, true, payload, false);
 686 }
 687 EXPORT_SYMBOL_GPL(kvm_queue_exception_p);
 688
 689 static void kvm_queue_exception_e_p(struct kvm_vcpu *vcpu, unsigned nr,
 690                                     u32 error_code, unsigned long payload)
 691 {
 692         kvm_multiple_exception(vcpu, nr, true, error_code,
 693                                true, payload, false);
 694 }
 695
 696 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
 697 {
 698         if (err)
 699                 kvm_inject_gp(vcpu, 0);
 700         else
 701                 return kvm_skip_emulated_instruction(vcpu);
 702
 703         return 1;
 704 }
 705 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
 706
 707 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 708 {
 709         ++vcpu->stat.pf_guest;
 710         vcpu->arch.exception.nested_apf =
 711                 is_guest_mode(vcpu) && fault->async_page_fault;
 712         if (vcpu->arch.exception.nested_apf) {
 713                 vcpu->arch.apf.nested_apf_token = fault->address;
 714                 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
 715         } else {
 716                 kvm_queue_exception_e_p(vcpu, PF_VECTOR, fault->error_code,
 717                                         fault->address);
 718         }
 719 }
 720 EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
 721
 722 bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
 723                                     struct x86_exception *fault)
 724 {
 725         struct kvm_mmu *fault_mmu;
 726         WARN_ON_ONCE(fault->vector != PF_VECTOR);
 727
 728         fault_mmu = fault->nested_page_fault ? vcpu->arch.mmu :
 729                                                vcpu->arch.walk_mmu;
 730
 731         /*
 732          * Invalidate the TLB entry for the faulting address, if it exists,
 733          * else the access will fault indefinitely (and to emulate hardware).
 734          */
 735         if ((fault->error_code & PFERR_PRESENT_MASK) &&
 736             !(fault->error_code & PFERR_RSVD_MASK))
 737                 kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address,
 738                                        fault_mmu->root_hpa);
 739
 740         fault_mmu->inject_page_fault(vcpu, fault);
 741         return fault->nested_page_fault;
 742 }
 743 EXPORT_SYMBOL_GPL(kvm_inject_emulated_page_fault);
 744
 745 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 746 {
 747         atomic_inc(&vcpu->arch.nmi_queued);
 748         kvm_make_request(KVM_REQ_NMI, vcpu);
 749 }
 750 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 751
 752 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 753 {
 754         kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, false);
 755 }
 756 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 757
 758 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 759 {
 760         kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, true);
 761 }
 762 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 763
 764 /*
 765  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 766  * a #GP and return false.
 767  */
 768 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 769 {
 770         if (static_call(kvm_x86_get_cpl)(vcpu) <= required_cpl)
 771                 return true;
 772         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 773         return false;
 774 }
 775 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 776
 777 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr)
 778 {
 779         if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 780                 return true;
 781
 782         kvm_queue_exception(vcpu, UD_VECTOR);
 783         return false;
 784 }
 785 EXPORT_SYMBOL_GPL(kvm_require_dr);
 786
 787 /*
 788  * This function will be used to read from the physical memory of the currently
 789  * running guest. The difference to kvm_vcpu_read_guest_page is that this function
 790  * can read from guest physical or from the guest's guest physical memory.
 791  */
 792 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 793                             gfn_t ngfn, void *data, int offset, int len,
 794                             u32 access)
 795 {
 796         struct x86_exception exception;
 797         gfn_t real_gfn;
 798         gpa_t ngpa;
 799
 800         ngpa     = gfn_to_gpa(ngfn);
 801         real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception);
 802         if (real_gfn == UNMAPPED_GVA)
 803                 return -EFAULT;
 804
 805         real_gfn = gpa_to_gfn(real_gfn);
 806
 807         return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len);
 808 }
 809 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 810
 811 static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu)
 812 {
 813         return vcpu->arch.reserved_gpa_bits | rsvd_bits(5, 8) | rsvd_bits(1, 2);
 814 }
 815
 816 /*
 817  * Load the pae pdptrs.  Return 1 if they are all valid, 0 otherwise.
 818  */
 819 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 820 {
 821         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 822         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 823         int i;
 824         int ret;
 825         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 826
 827         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 828                                       offset * sizeof(u64), sizeof(pdpte),
 829                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 830         if (ret < 0) {
 831                 ret = 0;
 832                 goto out;
 833         }
 834         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 835                 if ((pdpte[i] & PT_PRESENT_MASK) &&
 836                     (pdpte[i] & pdptr_rsvd_bits(vcpu))) {
 837                         ret = 0;
 838                         goto out;
 839                 }
 840         }
 841         ret = 1;
 842
 843         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 844         kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
 845         vcpu->arch.pdptrs_from_userspace = false;
 846
 847 out:
 848
 849         return ret;
 850 }
 851 EXPORT_SYMBOL_GPL(load_pdptrs);
 852
 853 void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0)
 854 {
 855         if ((cr0 ^ old_cr0) & X86_CR0_PG) {
 856                 kvm_clear_async_pf_completion_queue(vcpu);
 857                 kvm_async_pf_hash_reset(vcpu);
 858         }
 859
 860         if ((cr0 ^ old_cr0) & KVM_MMU_CR0_ROLE_BITS)
 861                 kvm_mmu_reset_context(vcpu);
 862
 863         if (((cr0 ^ old_cr0) & X86_CR0_CD) &&
 864             kvm_arch_has_noncoherent_dma(vcpu->kvm) &&
 865             !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
 866                 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL);
 867 }
 868 EXPORT_SYMBOL_GPL(kvm_post_set_cr0);
 869
 870 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 871 {
 872         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 873         unsigned long pdptr_bits = X86_CR0_CD | X86_CR0_NW | X86_CR0_PG;
 874
 875         cr0 |= X86_CR0_ET;
 876
 877 #ifdef CONFIG_X86_64
 878         if (cr0 & 0xffffffff00000000UL)
 879                 return 1;
 880 #endif
 881
 882         cr0 &= ~CR0_RESERVED_BITS;
 883
 884         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 885                 return 1;
 886
 887         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 888                 return 1;
 889
 890 #ifdef CONFIG_X86_64
 891         if ((vcpu->arch.efer & EFER_LME) && !is_paging(vcpu) &&
 892             (cr0 & X86_CR0_PG)) {
 893                 int cs_db, cs_l;
 894
 895                 if (!is_pae(vcpu))
 896                         return 1;
 897                 static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l);
 898                 if (cs_l)
 899                         return 1;
 900         }
 901 #endif
 902         if (!(vcpu->arch.efer & EFER_LME) && (cr0 & X86_CR0_PG) &&
 903             is_pae(vcpu) && ((cr0 ^ old_cr0) & pdptr_bits) &&
 904             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)))
 905                 return 1;
 906
 907         if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
 908                 return 1;
 909
 910         static_call(kvm_x86_set_cr0)(vcpu, cr0);
 911
 912         kvm_post_set_cr0(vcpu, old_cr0, cr0);
 913
 914         return 0;
 915 }
 916 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 917
 918 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 919 {
 920         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 921 }
 922 EXPORT_SYMBOL_GPL(kvm_lmsw);
 923
 924 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu)
 925 {
 926         if (vcpu->arch.guest_state_protected)
 927                 return;
 928
 929         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) {
 930
 931                 if (vcpu->arch.xcr0 != host_xcr0)
 932                         xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
 933
 934                 if (vcpu->arch.xsaves_enabled &&
 935                     vcpu->arch.ia32_xss != host_xss)
 936                         wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss);
 937         }
 938
 939         if (static_cpu_has(X86_FEATURE_PKU) &&
 940             (kvm_read_cr4_bits(vcpu, X86_CR4_PKE) ||
 941              (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU)) &&
 942             vcpu->arch.pkru != vcpu->arch.host_pkru)
 943                 write_pkru(vcpu->arch.pkru);
 944 }
 945 EXPORT_SYMBOL_GPL(kvm_load_guest_xsave_state);
 946
 947 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu)
 948 {
 949         if (vcpu->arch.guest_state_protected)
 950                 return;
 951
 952         if (static_cpu_has(X86_FEATURE_PKU) &&
 953             (kvm_read_cr4_bits(vcpu, X86_CR4_PKE) ||
 954              (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU))) {
 955                 vcpu->arch.pkru = rdpkru();
 956                 if (vcpu->arch.pkru != vcpu->arch.host_pkru)
 957                         write_pkru(vcpu->arch.host_pkru);
 958         }
 959
 960         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) {
 961
 962                 if (vcpu->arch.xcr0 != host_xcr0)
 963                         xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
 964
 965                 if (vcpu->arch.xsaves_enabled &&
 966                     vcpu->arch.ia32_xss != host_xss)
 967                         wrmsrl(MSR_IA32_XSS, host_xss);
 968         }
 969
 970 }
 971 EXPORT_SYMBOL_GPL(kvm_load_host_xsave_state);
 972
 973 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 974 {
 975         u64 xcr0 = xcr;
 976         u64 old_xcr0 = vcpu->arch.xcr0;
 977         u64 valid_bits;
 978
 979         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 980         if (index != XCR_XFEATURE_ENABLED_MASK)
 981                 return 1;
 982         if (!(xcr0 & XFEATURE_MASK_FP))
 983                 return 1;
 984         if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE))
 985                 return 1;
 986
 987         /*
 988          * Do not allow the guest to set bits that we do not support
 989          * saving.  However, xcr0 bit 0 is always set, even if the
 990          * emulated CPU does not support XSAVE (see fx_init).
 991          */
 992         valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
 993         if (xcr0 & ~valid_bits)
 994                 return 1;
 995
 996         if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) !=
 997             (!(xcr0 & XFEATURE_MASK_BNDCSR)))
 998                 return 1;
 999
1000         if (xcr0 & XFEATURE_MASK_AVX512) {
1001                 if (!(xcr0 & XFEATURE_MASK_YMM))
1002                         return 1;
1003                 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
1004                         return 1;
1005         }
1006         vcpu->arch.xcr0 = xcr0;
1007
1008         if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
1009                 kvm_update_cpuid_runtime(vcpu);
1010         return 0;
1011 }
1012
1013 int kvm_emulate_xsetbv(struct kvm_vcpu *vcpu)
1014 {
1015         if (static_call(kvm_x86_get_cpl)(vcpu) != 0 ||
1016             __kvm_set_xcr(vcpu, kvm_rcx_read(vcpu), kvm_read_edx_eax(vcpu))) {
1017                 kvm_inject_gp(vcpu, 0);
1018                 return 1;
1019         }
1020
1021         return kvm_skip_emulated_instruction(vcpu);
1022 }
1023 EXPORT_SYMBOL_GPL(kvm_emulate_xsetbv);
1024
1025 bool kvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1026 {
1027         if (cr4 & cr4_reserved_bits)
1028                 return false;
1029
1030         if (cr4 & vcpu->arch.cr4_guest_rsvd_bits)
1031                 return false;
1032
1033         return static_call(kvm_x86_is_valid_cr4)(vcpu, cr4);
1034 }
1035 EXPORT_SYMBOL_GPL(kvm_is_valid_cr4);
1036
1037 void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4)
1038 {
1039         if (((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS) ||
1040             (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
1041                 kvm_mmu_reset_context(vcpu);
1042 }
1043 EXPORT_SYMBOL_GPL(kvm_post_set_cr4);
1044
1045 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1046 {
1047         unsigned long old_cr4 = kvm_read_cr4(vcpu);
1048         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE |
1049                                    X86_CR4_SMEP;
1050
1051         if (!kvm_is_valid_cr4(vcpu, cr4))
1052                 return 1;
1053
1054         if (is_long_mode(vcpu)) {
1055                 if (!(cr4 & X86_CR4_PAE))
1056                         return 1;
1057                 if ((cr4 ^ old_cr4) & X86_CR4_LA57)
1058                         return 1;
1059         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
1060                    && ((cr4 ^ old_cr4) & pdptr_bits)
1061                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
1062                                    kvm_read_cr3(vcpu)))
1063                 return 1;
1064
1065         if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
1066                 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID))
1067                         return 1;
1068
1069                 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
1070                 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
1071                         return 1;
1072         }
1073
1074         static_call(kvm_x86_set_cr4)(vcpu, cr4);
1075
1076         kvm_post_set_cr4(vcpu, old_cr4, cr4);
1077
1078         return 0;
1079 }
1080 EXPORT_SYMBOL_GPL(kvm_set_cr4);
1081
1082 static void kvm_invalidate_pcid(struct kvm_vcpu *vcpu, unsigned long pcid)
1083 {
1084         struct kvm_mmu *mmu = vcpu->arch.mmu;
1085         unsigned long roots_to_free = 0;
1086         int i;
1087
1088         /*
1089          * If neither the current CR3 nor any of the prev_roots use the given
1090          * PCID, then nothing needs to be done here because a resync will
1091          * happen anyway before switching to any other CR3.
1092          */
1093         if (kvm_get_active_pcid(vcpu) == pcid) {
1094                 kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
1095                 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
1096         }
1097
1098         for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
1099                 if (kvm_get_pcid(vcpu, mmu->prev_roots[i].pgd) == pcid)
1100                         roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
1101
1102         kvm_mmu_free_roots(vcpu, mmu, roots_to_free);
1103 }
1104
1105 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1106 {
1107         bool skip_tlb_flush = false;
1108         unsigned long pcid = 0;
1109 #ifdef CONFIG_X86_64
1110         bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE);
1111
1112         if (pcid_enabled) {
1113                 skip_tlb_flush = cr3 & X86_CR3_PCID_NOFLUSH;
1114                 cr3 &= ~X86_CR3_PCID_NOFLUSH;
1115                 pcid = cr3 & X86_CR3_PCID_MASK;
1116         }
1117 #endif
1118
1119         /* PDPTRs are always reloaded for PAE paging. */
1120         if (cr3 == kvm_read_cr3(vcpu) && !is_pae_paging(vcpu))
1121                 goto handle_tlb_flush;
1122
1123         /*
1124          * Do not condition the GPA check on long mode, this helper is used to
1125          * stuff CR3, e.g. for RSM emulation, and there is no guarantee that
1126          * the current vCPU mode is accurate.
1127          */
1128         if (kvm_vcpu_is_illegal_gpa(vcpu, cr3))
1129                 return 1;
1130
1131         if (is_pae_paging(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
1132                 return 1;
1133
1134         if (cr3 != kvm_read_cr3(vcpu))
1135                 kvm_mmu_new_pgd(vcpu, cr3);
1136
1137         vcpu->arch.cr3 = cr3;
1138         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
1139
1140 handle_tlb_flush:
1141         /*
1142          * A load of CR3 that flushes the TLB flushes only the current PCID,
1143          * even if PCID is disabled, in which case PCID=0 is flushed.  It's a
1144          * moot point in the end because _disabling_ PCID will flush all PCIDs,
1145          * and it's impossible to use a non-zero PCID when PCID is disabled,
1146          * i.e. only PCID=0 can be relevant.
1147          */
1148         if (!skip_tlb_flush)
1149                 kvm_invalidate_pcid(vcpu, pcid);
1150
1151         return 0;
1152 }
1153 EXPORT_SYMBOL_GPL(kvm_set_cr3);
1154
1155 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
1156 {
1157         if (cr8 & CR8_RESERVED_BITS)
1158                 return 1;
1159         if (lapic_in_kernel(vcpu))
1160                 kvm_lapic_set_tpr(vcpu, cr8);
1161         else
1162                 vcpu->arch.cr8 = cr8;
1163         return 0;
1164 }
1165 EXPORT_SYMBOL_GPL(kvm_set_cr8);
1166
1167 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
1168 {
1169         if (lapic_in_kernel(vcpu))
1170                 return kvm_lapic_get_cr8(vcpu);
1171         else
1172                 return vcpu->arch.cr8;
1173 }
1174 EXPORT_SYMBOL_GPL(kvm_get_cr8);
1175
1176 static void kvm_update_dr0123(struct kvm_vcpu *vcpu)
1177 {
1178         int i;
1179
1180         if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
1181                 for (i = 0; i < KVM_NR_DB_REGS; i++)
1182                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
1183                 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD;
1184         }
1185 }
1186
1187 void kvm_update_dr7(struct kvm_vcpu *vcpu)
1188 {
1189         unsigned long dr7;
1190
1191         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1192                 dr7 = vcpu->arch.guest_debug_dr7;
1193         else
1194                 dr7 = vcpu->arch.dr7;
1195         static_call(kvm_x86_set_dr7)(vcpu, dr7);
1196         vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED;
1197         if (dr7 & DR7_BP_EN_MASK)
1198                 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED;
1199 }
1200 EXPORT_SYMBOL_GPL(kvm_update_dr7);
1201
1202 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu)
1203 {
1204         u64 fixed = DR6_FIXED_1;
1205
1206         if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM))
1207                 fixed |= DR6_RTM;
1208
1209         if (!guest_cpuid_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT))
1210                 fixed |= DR6_BUS_LOCK;
1211         return fixed;
1212 }
1213
1214 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
1215 {
1216         size_t size = ARRAY_SIZE(vcpu->arch.db);
1217
1218         switch (dr) {
1219         case 0 ... 3:
1220                 vcpu->arch.db[array_index_nospec(dr, size)] = val;
1221                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
1222                         vcpu->arch.eff_db[dr] = val;
1223                 break;
1224         case 4:
1225         case 6:
1226                 if (!kvm_dr6_valid(val))
1227                         return 1; /* #GP */
1228                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
1229                 break;
1230         case 5:
1231         default: /* 7 */
1232                 if (!kvm_dr7_valid(val))
1233                         return 1; /* #GP */
1234                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
1235                 kvm_update_dr7(vcpu);
1236                 break;
1237         }
1238
1239         return 0;
1240 }
1241 EXPORT_SYMBOL_GPL(kvm_set_dr);
1242
1243 void kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
1244 {
1245         size_t size = ARRAY_SIZE(vcpu->arch.db);
1246
1247         switch (dr) {
1248         case 0 ... 3:
1249                 *val = vcpu->arch.db[array_index_nospec(dr, size)];
1250                 break;
1251         case 4:
1252         case 6:
1253                 *val = vcpu->arch.dr6;
1254                 break;
1255         case 5:
1256         default: /* 7 */
1257                 *val = vcpu->arch.dr7;
1258                 break;
1259         }
1260 }
1261 EXPORT_SYMBOL_GPL(kvm_get_dr);
1262
1263 int kvm_emulate_rdpmc(struct kvm_vcpu *vcpu)
1264 {
1265         u32 ecx = kvm_rcx_read(vcpu);
1266         u64 data;
1267
1268         if (kvm_pmu_rdpmc(vcpu, ecx, &data)) {
1269                 kvm_inject_gp(vcpu, 0);
1270                 return 1;
1271         }
1272
1273         kvm_rax_write(vcpu, (u32)data);
1274         kvm_rdx_write(vcpu, data >> 32);
1275         return kvm_skip_emulated_instruction(vcpu);
1276 }
1277 EXPORT_SYMBOL_GPL(kvm_emulate_rdpmc);
1278
1279 /*
1280  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1281  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1282  *
1283  * The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features)
1284  * extract the supported MSRs from the related const lists.
1285  * msrs_to_save is selected from the msrs_to_save_all to reflect the
1286  * capabilities of the host cpu. This capabilities test skips MSRs that are
1287  * kvm-specific. Those are put in emulated_msrs_all; filtering of emulated_msrs
1288  * may depend on host virtualization features rather than host cpu features.
1289  */
1290
1291 static const u32 msrs_to_save_all[] = {
1292         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1293         MSR_STAR,
1294 #ifdef CONFIG_X86_64
1295         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1296 #endif
1297         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
1298         MSR_IA32_FEAT_CTL, MSR_IA32_BNDCFGS, MSR_TSC_AUX,
1299         MSR_IA32_SPEC_CTRL,
1300         MSR_IA32_RTIT_CTL, MSR_IA32_RTIT_STATUS, MSR_IA32_RTIT_CR3_MATCH,
1301         MSR_IA32_RTIT_OUTPUT_BASE, MSR_IA32_RTIT_OUTPUT_MASK,
1302         MSR_IA32_RTIT_ADDR0_A, MSR_IA32_RTIT_ADDR0_B,
1303         MSR_IA32_RTIT_ADDR1_A, MSR_IA32_RTIT_ADDR1_B,
1304         MSR_IA32_RTIT_ADDR2_A, MSR_IA32_RTIT_ADDR2_B,
1305         MSR_IA32_RTIT_ADDR3_A, MSR_IA32_RTIT_ADDR3_B,
1306         MSR_IA32_UMWAIT_CONTROL,
1307
1308         MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1,
1309         MSR_ARCH_PERFMON_FIXED_CTR0 + 2, MSR_ARCH_PERFMON_FIXED_CTR0 + 3,
1310         MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS,
1311         MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL,
1312         MSR_ARCH_PERFMON_PERFCTR0, MSR_ARCH_PERFMON_PERFCTR1,
1313         MSR_ARCH_PERFMON_PERFCTR0 + 2, MSR_ARCH_PERFMON_PERFCTR0 + 3,
1314         MSR_ARCH_PERFMON_PERFCTR0 + 4, MSR_ARCH_PERFMON_PERFCTR0 + 5,
1315         MSR_ARCH_PERFMON_PERFCTR0 + 6, MSR_ARCH_PERFMON_PERFCTR0 + 7,
1316         MSR_ARCH_PERFMON_PERFCTR0 + 8, MSR_ARCH_PERFMON_PERFCTR0 + 9,
1317         MSR_ARCH_PERFMON_PERFCTR0 + 10, MSR_ARCH_PERFMON_PERFCTR0 + 11,
1318         MSR_ARCH_PERFMON_PERFCTR0 + 12, MSR_ARCH_PERFMON_PERFCTR0 + 13,
1319         MSR_ARCH_PERFMON_PERFCTR0 + 14, MSR_ARCH_PERFMON_PERFCTR0 + 15,
1320         MSR_ARCH_PERFMON_PERFCTR0 + 16, MSR_ARCH_PERFMON_PERFCTR0 + 17,
1321         MSR_ARCH_PERFMON_EVENTSEL0, MSR_ARCH_PERFMON_EVENTSEL1,
1322         MSR_ARCH_PERFMON_EVENTSEL0 + 2, MSR_ARCH_PERFMON_EVENTSEL0 + 3,
1323         MSR_ARCH_PERFMON_EVENTSEL0 + 4, MSR_ARCH_PERFMON_EVENTSEL0 + 5,
1324         MSR_ARCH_PERFMON_EVENTSEL0 + 6, MSR_ARCH_PERFMON_EVENTSEL0 + 7,
1325         MSR_ARCH_PERFMON_EVENTSEL0 + 8, MSR_ARCH_PERFMON_EVENTSEL0 + 9,
1326         MSR_ARCH_PERFMON_EVENTSEL0 + 10, MSR_ARCH_PERFMON_EVENTSEL0 + 11,
1327         MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13,
1328         MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15,
1329         MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
1330 };
1331
1332 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
1333 static unsigned num_msrs_to_save;
1334
1335 static const u32 emulated_msrs_all[] = {
1336         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
1337         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
1338         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
1339         HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC,
1340         HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY,
1341         HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2,
1342         HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL,
1343         HV_X64_MSR_RESET,
1344         HV_X64_MSR_VP_INDEX,
1345         HV_X64_MSR_VP_RUNTIME,
1346         HV_X64_MSR_SCONTROL,
1347         HV_X64_MSR_STIMER0_CONFIG,
1348         HV_X64_MSR_VP_ASSIST_PAGE,
1349         HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL,
1350         HV_X64_MSR_TSC_EMULATION_STATUS,
1351         HV_X64_MSR_SYNDBG_OPTIONS,
1352         HV_X64_MSR_SYNDBG_CONTROL, HV_X64_MSR_SYNDBG_STATUS,
1353         HV_X64_MSR_SYNDBG_SEND_BUFFER, HV_X64_MSR_SYNDBG_RECV_BUFFER,
1354         HV_X64_MSR_SYNDBG_PENDING_BUFFER,
1355
1356         MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
1357         MSR_KVM_PV_EOI_EN, MSR_KVM_ASYNC_PF_INT, MSR_KVM_ASYNC_PF_ACK,
1358
1359         MSR_IA32_TSC_ADJUST,
1360         MSR_IA32_TSC_DEADLINE,
1361         MSR_IA32_ARCH_CAPABILITIES,
1362         MSR_IA32_PERF_CAPABILITIES,
1363         MSR_IA32_MISC_ENABLE,
1364         MSR_IA32_MCG_STATUS,
1365         MSR_IA32_MCG_CTL,
1366         MSR_IA32_MCG_EXT_CTL,
1367         MSR_IA32_SMBASE,
1368         MSR_SMI_COUNT,
1369         MSR_PLATFORM_INFO,
1370         MSR_MISC_FEATURES_ENABLES,
1371         MSR_AMD64_VIRT_SPEC_CTRL,
1372         MSR_IA32_POWER_CTL,
1373         MSR_IA32_UCODE_REV,
1374
1375         /*
1376          * The following list leaves out MSRs whose values are determined
1377          * by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs.
1378          * We always support the "true" VMX control MSRs, even if the host
1379          * processor does not, so I am putting these registers here rather
1380          * than in msrs_to_save_all.
1381          */
1382         MSR_IA32_VMX_BASIC,
1383         MSR_IA32_VMX_TRUE_PINBASED_CTLS,
1384         MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
1385         MSR_IA32_VMX_TRUE_EXIT_CTLS,
1386         MSR_IA32_VMX_TRUE_ENTRY_CTLS,
1387         MSR_IA32_VMX_MISC,
1388         MSR_IA32_VMX_CR0_FIXED0,
1389         MSR_IA32_VMX_CR4_FIXED0,
1390         MSR_IA32_VMX_VMCS_ENUM,
1391         MSR_IA32_VMX_PROCBASED_CTLS2,
1392         MSR_IA32_VMX_EPT_VPID_CAP,
1393         MSR_IA32_VMX_VMFUNC,
1394
1395         MSR_K7_HWCR,
1396         MSR_KVM_POLL_CONTROL,
1397 };
1398
1399 static u32 emulated_msrs[ARRAY_SIZE(emulated_msrs_all)];
1400 static unsigned num_emulated_msrs;
1401
1402 /*
1403  * List of msr numbers which are used to expose MSR-based features that
1404  * can be used by a hypervisor to validate requested CPU features.
1405  */
1406 static const u32 msr_based_features_all[] = {
1407         MSR_IA32_VMX_BASIC,
1408         MSR_IA32_VMX_TRUE_PINBASED_CTLS,
1409         MSR_IA32_VMX_PINBASED_CTLS,
1410         MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
1411         MSR_IA32_VMX_PROCBASED_CTLS,
1412         MSR_IA32_VMX_TRUE_EXIT_CTLS,
1413         MSR_IA32_VMX_EXIT_CTLS,
1414         MSR_IA32_VMX_TRUE_ENTRY_CTLS,
1415         MSR_IA32_VMX_ENTRY_CTLS,
1416         MSR_IA32_VMX_MISC,
1417         MSR_IA32_VMX_CR0_FIXED0,
1418         MSR_IA32_VMX_CR0_FIXED1,
1419         MSR_IA32_VMX_CR4_FIXED0,
1420         MSR_IA32_VMX_CR4_FIXED1,
1421         MSR_IA32_VMX_VMCS_ENUM,
1422         MSR_IA32_VMX_PROCBASED_CTLS2,
1423         MSR_IA32_VMX_EPT_VPID_CAP,
1424         MSR_IA32_VMX_VMFUNC,
1425
1426         MSR_F10H_DECFG,
1427         MSR_IA32_UCODE_REV,
1428         MSR_IA32_ARCH_CAPABILITIES,
1429         MSR_IA32_PERF_CAPABILITIES,
1430 };
1431
1432 static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all)];
1433 static unsigned int num_msr_based_features;
1434
1435 static u64 kvm_get_arch_capabilities(void)
1436 {
1437         u64 data = 0;
1438
1439         if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES))
1440                 rdmsrl(MSR_IA32_ARCH_CAPABILITIES, data);
1441
1442         /*
1443          * If nx_huge_pages is enabled, KVM's shadow paging will ensure that
1444          * the nested hypervisor runs with NX huge pages.  If it is not,
1445          * L1 is anyway vulnerable to ITLB_MULTIHIT exploits from other
1446          * L1 guests, so it need not worry about its own (L2) guests.
1447          */
1448         data |= ARCH_CAP_PSCHANGE_MC_NO;
1449
1450         /*
1451          * If we're doing cache flushes (either "always" or "cond")
1452          * we will do one whenever the guest does a vmlaunch/vmresume.
1453          * If an outer hypervisor is doing the cache flush for us
1454          * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that
1455          * capability to the guest too, and if EPT is disabled we're not
1456          * vulnerable.  Overall, only VMENTER_L1D_FLUSH_NEVER will
1457          * require a nested hypervisor to do a flush of its own.
1458          */
1459         if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER)
1460                 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH;
1461
1462         if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
1463                 data |= ARCH_CAP_RDCL_NO;
1464         if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
1465                 data |= ARCH_CAP_SSB_NO;
1466         if (!boot_cpu_has_bug(X86_BUG_MDS))
1467                 data |= ARCH_CAP_MDS_NO;
1468
1469         if (!boot_cpu_has(X86_FEATURE_RTM)) {
1470                 /*
1471                  * If RTM=0 because the kernel has disabled TSX, the host might
1472                  * have TAA_NO or TSX_CTRL.  Clear TAA_NO (the guest sees RTM=0
1473                  * and therefore knows that there cannot be TAA) but keep
1474                  * TSX_CTRL: some buggy userspaces leave it set on tsx=on hosts,
1475                  * and we want to allow migrating those guests to tsx=off hosts.
1476                  */
1477                 data &= ~ARCH_CAP_TAA_NO;
1478         } else if (!boot_cpu_has_bug(X86_BUG_TAA)) {
1479                 data |= ARCH_CAP_TAA_NO;
1480         } else {
1481                 /*
1482                  * Nothing to do here; we emulate TSX_CTRL if present on the
1483                  * host so the guest can choose between disabling TSX or
1484                  * using VERW to clear CPU buffers.
1485                  */
1486         }
1487
1488         return data;
1489 }
1490
1491 static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
1492 {
1493         switch (msr->index) {
1494         case MSR_IA32_ARCH_CAPABILITIES:
1495                 msr->data = kvm_get_arch_capabilities();
1496                 break;
1497         case MSR_IA32_UCODE_REV:
1498                 rdmsrl_safe(msr->index, &msr->data);
1499                 break;
1500         default:
1501                 return static_call(kvm_x86_get_msr_feature)(msr);
1502         }
1503         return 0;
1504 }
1505
1506 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1507 {
1508         struct kvm_msr_entry msr;
1509         int r;
1510
1511         msr.index = index;
1512         r = kvm_get_msr_feature(&msr);
1513
1514         if (r == KVM_MSR_RET_INVALID) {
1515                 /* Unconditionally clear the output for simplicity */
1516                 *data = 0;
1517                 if (kvm_msr_ignored_check(index, 0, false))
1518                         r = 0;
1519         }
1520
1521         if (r)
1522                 return r;
1523
1524         *data = msr.data;
1525
1526         return 0;
1527 }
1528
1529 static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1530 {
1531         if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT))
1532                 return false;
1533
1534         if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
1535                 return false;
1536
1537         if (efer & (EFER_LME | EFER_LMA) &&
1538             !guest_cpuid_has(vcpu, X86_FEATURE_LM))
1539                 return false;
1540
1541         if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX))
1542                 return false;
1543
1544         return true;
1545
1546 }
1547 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1548 {
1549         if (efer & efer_reserved_bits)
1550                 return false;
1551
1552         return __kvm_valid_efer(vcpu, efer);
1553 }
1554 EXPORT_SYMBOL_GPL(kvm_valid_efer);
1555
1556 static int set_efer(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
1557 {
1558         u64 old_efer = vcpu->arch.efer;
1559         u64 efer = msr_info->data;
1560         int r;
1561
1562         if (efer & efer_reserved_bits)
1563                 return 1;
1564
1565         if (!msr_info->host_initiated) {
1566                 if (!__kvm_valid_efer(vcpu, efer))
1567                         return 1;
1568
1569                 if (is_paging(vcpu) &&
1570                     (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
1571                         return 1;
1572         }
1573
1574         efer &= ~EFER_LMA;
1575         efer |= vcpu->arch.efer & EFER_LMA;
1576
1577         r = static_call(kvm_x86_set_efer)(vcpu, efer);
1578         if (r) {
1579                 WARN_ON(r > 0);
1580                 return r;
1581         }
1582
1583         /* Update reserved bits */
1584         if ((efer ^ old_efer) & EFER_NX)
1585                 kvm_mmu_reset_context(vcpu);
1586
1587         return 0;
1588 }
1589
1590 void kvm_enable_efer_bits(u64 mask)
1591 {
1592        efer_reserved_bits &= ~mask;
1593 }
1594 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
1595
1596 bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type)
1597 {
1598         struct kvm_x86_msr_filter *msr_filter;
1599         struct msr_bitmap_range *ranges;
1600         struct kvm *kvm = vcpu->kvm;
1601         bool allowed;
1602         int idx;
1603         u32 i;
1604
1605         /* x2APIC MSRs do not support filtering. */
1606         if (index >= 0x800 && index <= 0x8ff)
1607                 return true;
1608
1609         idx = srcu_read_lock(&kvm->srcu);
1610
1611         msr_filter = srcu_dereference(kvm->arch.msr_filter, &kvm->srcu);
1612         if (!msr_filter) {
1613                 allowed = true;
1614                 goto out;
1615         }
1616
1617         allowed = msr_filter->default_allow;
1618         ranges = msr_filter->ranges;
1619
1620         for (i = 0; i < msr_filter->count; i++) {
1621                 u32 start = ranges[i].base;
1622                 u32 end = start + ranges[i].nmsrs;
1623                 u32 flags = ranges[i].flags;
1624                 unsigned long *bitmap = ranges[i].bitmap;
1625
1626                 if ((index >= start) && (index < end) && (flags & type)) {
1627                         allowed = !!test_bit(index - start, bitmap);
1628                         break;
1629                 }
1630         }
1631
1632 out:
1633         srcu_read_unlock(&kvm->srcu, idx);
1634
1635         return allowed;
1636 }
1637 EXPORT_SYMBOL_GPL(kvm_msr_allowed);
1638
1639 /*
1640  * Write @data into the MSR specified by @index.  Select MSR specific fault
1641  * checks are bypassed if @host_initiated is %true.
1642  * Returns 0 on success, non-0 otherwise.
1643  * Assumes vcpu_load() was already called.
1644  */
1645 static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data,
1646                          bool host_initiated)
1647 {
1648         struct msr_data msr;
1649
1650         if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
1651                 return KVM_MSR_RET_FILTERED;
1652
1653         switch (index) {
1654         case MSR_FS_BASE:
1655         case MSR_GS_BASE:
1656         case MSR_KERNEL_GS_BASE:
1657         case MSR_CSTAR:
1658         case MSR_LSTAR:
1659                 if (is_noncanonical_address(data, vcpu))
1660                         return 1;
1661                 break;
1662         case MSR_IA32_SYSENTER_EIP:
1663         case MSR_IA32_SYSENTER_ESP:
1664                 /*
1665                  * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1666                  * non-canonical address is written on Intel but not on
1667                  * AMD (which ignores the top 32-bits, because it does
1668                  * not implement 64-bit SYSENTER).
1669                  *
1670                  * 64-bit code should hence be able to write a non-canonical
1671                  * value on AMD.  Making the address canonical ensures that
1672                  * vmentry does not fail on Intel after writing a non-canonical
1673                  * value, and that something deterministic happens if the guest
1674                  * invokes 64-bit SYSENTER.
1675                  */
1676                 data = get_canonical(data, vcpu_virt_addr_bits(vcpu));
1677                 break;
1678         case MSR_TSC_AUX:
1679                 if (!kvm_is_supported_user_return_msr(MSR_TSC_AUX))
1680                         return 1;
1681
1682                 if (!host_initiated &&
1683                     !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP) &&
1684                     !guest_cpuid_has(vcpu, X86_FEATURE_RDPID))
1685                         return 1;
1686
1687                 /*
1688                  * Per Intel's SDM, bits 63:32 are reserved, but AMD's APM has
1689                  * incomplete and conflicting architectural behavior.  Current
1690                  * AMD CPUs completely ignore bits 63:32, i.e. they aren't
1691                  * reserved and always read as zeros.  Enforce Intel's reserved
1692                  * bits check if and only if the guest CPU is Intel, and clear
1693                  * the bits in all other cases.  This ensures cross-vendor
1694                  * migration will provide consistent behavior for the guest.
1695                  */
1696                 if (guest_cpuid_is_intel(vcpu) && (data >> 32) != 0)
1697                         return 1;
1698
1699                 data = (u32)data;
1700                 break;
1701         }
1702
1703         msr.data = data;
1704         msr.index = index;
1705         msr.host_initiated = host_initiated;
1706
1707         return static_call(kvm_x86_set_msr)(vcpu, &msr);
1708 }
1709
1710 static int kvm_set_msr_ignored_check(struct kvm_vcpu *vcpu,
1711                                      u32 index, u64 data, bool host_initiated)
1712 {
1713         int ret = __kvm_set_msr(vcpu, index, data, host_initiated);
1714
1715         if (ret == KVM_MSR_RET_INVALID)
1716                 if (kvm_msr_ignored_check(index, data, true))
1717                         ret = 0;
1718
1719         return ret;
1720 }
1721
1722 /*
1723  * Read the MSR specified by @index into @data.  Select MSR specific fault
1724  * checks are bypassed if @host_initiated is %true.
1725  * Returns 0 on success, non-0 otherwise.
1726  * Assumes vcpu_load() was already called.
1727  */
1728 int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data,
1729                   bool host_initiated)
1730 {
1731         struct msr_data msr;
1732         int ret;
1733
1734         if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
1735                 return KVM_MSR_RET_FILTERED;
1736
1737         switch (index) {
1738         case MSR_TSC_AUX:
1739                 if (!kvm_is_supported_user_return_msr(MSR_TSC_AUX))
1740                         return 1;
1741
1742                 if (!host_initiated &&
1743                     !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP) &&
1744                     !guest_cpuid_has(vcpu, X86_FEATURE_RDPID))
1745                         return 1;
1746                 break;
1747         }
1748
1749         msr.index = index;
1750         msr.host_initiated = host_initiated;
1751
1752         ret = static_call(kvm_x86_get_msr)(vcpu, &msr);
1753         if (!ret)
1754                 *data = msr.data;
1755         return ret;
1756 }
1757
1758 static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu,
1759                                      u32 index, u64 *data, bool host_initiated)
1760 {
1761         int ret = __kvm_get_msr(vcpu, index, data, host_initiated);
1762
1763         if (ret == KVM_MSR_RET_INVALID) {
1764                 /* Unconditionally clear *data for simplicity */
1765                 *data = 0;
1766                 if (kvm_msr_ignored_check(index, 0, false))
1767                         ret = 0;
1768         }
1769
1770         return ret;
1771 }
1772
1773 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data)
1774 {
1775         return kvm_get_msr_ignored_check(vcpu, index, data, false);
1776 }
1777 EXPORT_SYMBOL_GPL(kvm_get_msr);
1778
1779 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
1780 {
1781         return kvm_set_msr_ignored_check(vcpu, index, data, false);
1782 }
1783 EXPORT_SYMBOL_GPL(kvm_set_msr);
1784
1785 static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu)
1786 {
1787         int err = vcpu->run->msr.error;
1788         if (!err) {
1789                 kvm_rax_write(vcpu, (u32)vcpu->run->msr.data);
1790                 kvm_rdx_write(vcpu, vcpu->run->msr.data >> 32);
1791         }
1792
1793         return static_call(kvm_x86_complete_emulated_msr)(vcpu, err);
1794 }
1795
1796 static int complete_emulated_wrmsr(struct kvm_vcpu *vcpu)
1797 {
1798         return static_call(kvm_x86_complete_emulated_msr)(vcpu, vcpu->run->msr.error);
1799 }
1800
1801 static u64 kvm_msr_reason(int r)
1802 {
1803         switch (r) {
1804         case KVM_MSR_RET_INVALID:
1805                 return KVM_MSR_EXIT_REASON_UNKNOWN;
1806         case KVM_MSR_RET_FILTERED:
1807                 return KVM_MSR_EXIT_REASON_FILTER;
1808         default:
1809                 return KVM_MSR_EXIT_REASON_INVAL;
1810         }
1811 }
1812
1813 static int kvm_msr_user_space(struct kvm_vcpu *vcpu, u32 index,
1814                               u32 exit_reason, u64 data,
1815                               int (*completion)(struct kvm_vcpu *vcpu),
1816                               int r)
1817 {
1818         u64 msr_reason = kvm_msr_reason(r);
1819
1820         /* Check if the user wanted to know about this MSR fault */
1821         if (!(vcpu->kvm->arch.user_space_msr_mask & msr_reason))
1822                 return 0;
1823
1824         vcpu->run->exit_reason = exit_reason;
1825         vcpu->run->msr.error = 0;
1826         memset(vcpu->run->msr.pad, 0, sizeof(vcpu->run->msr.pad));
1827         vcpu->run->msr.reason = msr_reason;
1828         vcpu->run->msr.index = index;
1829         vcpu->run->msr.data = data;
1830         vcpu->arch.complete_userspace_io = completion;
1831
1832         return 1;
1833 }
1834
1835 static int kvm_get_msr_user_space(struct kvm_vcpu *vcpu, u32 index, int r)
1836 {
1837         return kvm_msr_user_space(vcpu, index, KVM_EXIT_X86_RDMSR, 0,
1838                                    complete_emulated_rdmsr, r);
1839 }
1840
1841 static int kvm_set_msr_user_space(struct kvm_vcpu *vcpu, u32 index, u64 data, int r)
1842 {
1843         return kvm_msr_user_space(vcpu, index, KVM_EXIT_X86_WRMSR, data,
1844                                    complete_emulated_wrmsr, r);
1845 }
1846
1847 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
1848 {
1849         u32 ecx = kvm_rcx_read(vcpu);
1850         u64 data;
1851         int r;
1852
1853         r = kvm_get_msr(vcpu, ecx, &data);
1854
1855         /* MSR read failed? See if we should ask user space */
1856         if (r && kvm_get_msr_user_space(vcpu, ecx, r)) {
1857                 /* Bounce to user space */
1858                 return 0;
1859         }
1860
1861         if (!r) {
1862                 trace_kvm_msr_read(ecx, data);
1863
1864                 kvm_rax_write(vcpu, data & -1u);
1865                 kvm_rdx_write(vcpu, (data >> 32) & -1u);
1866         } else {
1867                 trace_kvm_msr_read_ex(ecx);
1868         }
1869
1870         return static_call(kvm_x86_complete_emulated_msr)(vcpu, r);
1871 }
1872 EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr);
1873
1874 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
1875 {
1876         u32 ecx = kvm_rcx_read(vcpu);
1877         u64 data = kvm_read_edx_eax(vcpu);
1878         int r;
1879
1880         r = kvm_set_msr(vcpu, ecx, data);
1881
1882         /* MSR write failed? See if we should ask user space */
1883         if (r && kvm_set_msr_user_space(vcpu, ecx, data, r))
1884                 /* Bounce to user space */
1885                 return 0;
1886
1887         /* Signal all other negative errors to userspace */
1888         if (r < 0)
1889                 return r;
1890
1891         if (!r)
1892                 trace_kvm_msr_write(ecx, data);
1893         else
1894                 trace_kvm_msr_write_ex(ecx, data);
1895
1896         return static_call(kvm_x86_complete_emulated_msr)(vcpu, r);
1897 }
1898 EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
1899
1900 int kvm_emulate_as_nop(struct kvm_vcpu *vcpu)
1901 {
1902         return kvm_skip_emulated_instruction(vcpu);
1903 }
1904 EXPORT_SYMBOL_GPL(kvm_emulate_as_nop);
1905
1906 int kvm_emulate_invd(struct kvm_vcpu *vcpu)
1907 {
1908         /* Treat an INVD instruction as a NOP and just skip it. */
1909         return kvm_emulate_as_nop(vcpu);
1910 }
1911 EXPORT_SYMBOL_GPL(kvm_emulate_invd);
1912
1913 int kvm_emulate_mwait(struct kvm_vcpu *vcpu)
1914 {
1915         pr_warn_once("kvm: MWAIT instruction emulated as NOP!\n");
1916         return kvm_emulate_as_nop(vcpu);
1917 }
1918 EXPORT_SYMBOL_GPL(kvm_emulate_mwait);
1919
1920 int kvm_handle_invalid_op(struct kvm_vcpu *vcpu)
1921 {
1922         kvm_queue_exception(vcpu, UD_VECTOR);
1923         return 1;
1924 }
1925 EXPORT_SYMBOL_GPL(kvm_handle_invalid_op);
1926
1927 int kvm_emulate_monitor(struct kvm_vcpu *vcpu)
1928 {
1929         pr_warn_once("kvm: MONITOR instruction emulated as NOP!\n");
1930         return kvm_emulate_as_nop(vcpu);
1931 }
1932 EXPORT_SYMBOL_GPL(kvm_emulate_monitor);
1933
1934 static inline bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
1935 {
1936         xfer_to_guest_mode_prepare();
1937         return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
1938                 xfer_to_guest_mode_work_pending();
1939 }
1940
1941 /*
1942  * The fast path for frequent and performance sensitive wrmsr emulation,
1943  * i.e. the sending of IPI, sending IPI early in the VM-Exit flow reduces
1944  * the latency of virtual IPI by avoiding the expensive bits of transitioning
1945  * from guest to host, e.g. reacquiring KVM's SRCU lock. In contrast to the
1946  * other cases which must be called after interrupts are enabled on the host.
1947  */
1948 static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data)
1949 {
1950         if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(vcpu->arch.apic))
1951                 return 1;
1952
1953         if (((data & APIC_SHORT_MASK) == APIC_DEST_NOSHORT) &&
1954                 ((data & APIC_DEST_MASK) == APIC_DEST_PHYSICAL) &&
1955                 ((data & APIC_MODE_MASK) == APIC_DM_FIXED) &&
1956                 ((u32)(data >> 32) != X2APIC_BROADCAST)) {
1957
1958                 data &= ~(1 << 12);
1959                 kvm_apic_send_ipi(vcpu->arch.apic, (u32)data, (u32)(data >> 32));
1960                 kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR2, (u32)(data >> 32));
1961                 kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR, (u32)data);
1962                 trace_kvm_apic_write(APIC_ICR, (u32)data);
1963                 return 0;
1964         }
1965
1966         return 1;
1967 }
1968
1969 static int handle_fastpath_set_tscdeadline(struct kvm_vcpu *vcpu, u64 data)
1970 {
1971         if (!kvm_can_use_hv_timer(vcpu))
1972                 return 1;
1973
1974         kvm_set_lapic_tscdeadline_msr(vcpu, data);
1975         return 0;
1976 }
1977
1978 fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu)
1979 {
1980         u32 msr = kvm_rcx_read(vcpu);
1981         u64 data;
1982         fastpath_t ret = EXIT_FASTPATH_NONE;
1983
1984         switch (msr) {
1985         case APIC_BASE_MSR + (APIC_ICR >> 4):
1986                 data = kvm_read_edx_eax(vcpu);
1987                 if (!handle_fastpath_set_x2apic_icr_irqoff(vcpu, data)) {
1988                         kvm_skip_emulated_instruction(vcpu);
1989                         ret = EXIT_FASTPATH_EXIT_HANDLED;
1990                 }
1991                 break;
1992         case MSR_IA32_TSC_DEADLINE:
1993                 data = kvm_read_edx_eax(vcpu);
1994                 if (!handle_fastpath_set_tscdeadline(vcpu, data)) {
1995                         kvm_skip_emulated_instruction(vcpu);
1996                         ret = EXIT_FASTPATH_REENTER_GUEST;
1997                 }
1998                 break;
1999         default:
2000                 break;
2001         }
2002
2003         if (ret != EXIT_FASTPATH_NONE)
2004                 trace_kvm_msr_write(msr, data);
2005
2006         return ret;
2007 }
2008 EXPORT_SYMBOL_GPL(handle_fastpath_set_msr_irqoff);
2009
2010 /*
2011  * Adapt set_msr() to msr_io()'s calling convention
2012  */
2013 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2014 {
2015         return kvm_get_msr_ignored_check(vcpu, index, data, true);
2016 }
2017
2018 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2019 {
2020         return kvm_set_msr_ignored_check(vcpu, index, *data, true);
2021 }
2022
2023 #ifdef CONFIG_X86_64
2024 struct pvclock_clock {
2025         int vclock_mode;
2026         u64 cycle_last;
2027         u64 mask;
2028         u32 mult;
2029         u32 shift;
2030         u64 base_cycles;
2031         u64 offset;
2032 };
2033
2034 struct pvclock_gtod_data {
2035         seqcount_t      seq;
2036
2037         struct pvclock_clock clock; /* extract of a clocksource struct */
2038         struct pvclock_clock raw_clock; /* extract of a clocksource struct */
2039
2040         ktime_t         offs_boot;
2041         u64             wall_time_sec;
2042 };
2043
2044 static struct pvclock_gtod_data pvclock_gtod_data;
2045
2046 static void update_pvclock_gtod(struct timekeeper *tk)
2047 {
2048         struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
2049
2050         write_seqcount_begin(&vdata->seq);
2051
2052         /* copy pvclock gtod data */
2053         vdata->clock.vclock_mode        = tk->tkr_mono.clock->vdso_clock_mode;
2054         vdata->clock.cycle_last         = tk->tkr_mono.cycle_last;
2055         vdata->clock.mask               = tk->tkr_mono.mask;
2056         vdata->clock.mult               = tk->tkr_mono.mult;
2057         vdata->clock.shift              = tk->tkr_mono.shift;
2058         vdata->clock.base_cycles        = tk->tkr_mono.xtime_nsec;
2059         vdata->clock.offset             = tk->tkr_mono.base;
2060
2061         vdata->raw_clock.vclock_mode    = tk->tkr_raw.clock->vdso_clock_mode;
2062         vdata->raw_clock.cycle_last     = tk->tkr_raw.cycle_last;
2063         vdata->raw_clock.mask           = tk->tkr_raw.mask;
2064         vdata->raw_clock.mult           = tk->tkr_raw.mult;
2065         vdata->raw_clock.shift          = tk->tkr_raw.shift;
2066         vdata->raw_clock.base_cycles    = tk->tkr_raw.xtime_nsec;
2067         vdata->raw_clock.offset         = tk->tkr_raw.base;
2068
2069         vdata->wall_time_sec            = tk->xtime_sec;
2070
2071         vdata->offs_boot                = tk->offs_boot;
2072
2073         write_seqcount_end(&vdata->seq);
2074 }
2075
2076 static s64 get_kvmclock_base_ns(void)
2077 {
2078         /* Count up from boot time, but with the frequency of the raw clock.  */
2079         return ktime_to_ns(ktime_add(ktime_get_raw(), pvclock_gtod_data.offs_boot));
2080 }
2081 #else
2082 static s64 get_kvmclock_base_ns(void)
2083 {
2084         /* Master clock not used, so we can just use CLOCK_BOOTTIME.  */
2085         return ktime_get_boottime_ns();
2086 }
2087 #endif
2088
2089 void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock, int sec_hi_ofs)
2090 {
2091         int version;
2092         int r;
2093         struct pvclock_wall_clock wc;
2094         u32 wc_sec_hi;
2095         u64 wall_nsec;
2096
2097         if (!wall_clock)
2098                 return;
2099
2100         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
2101         if (r)
2102                 return;
2103
2104         if (version & 1)
2105                 ++version;  /* first time write, random junk */
2106
2107         ++version;
2108
2109         if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version)))
2110                 return;
2111
2112         /*
2113          * The guest calculates current wall clock time by adding
2114          * system time (updated by kvm_guest_time_update below) to the
2115          * wall clock specified here.  We do the reverse here.
2116          */
2117         wall_nsec = ktime_get_real_ns() - get_kvmclock_ns(kvm);
2118
2119         wc.nsec = do_div(wall_nsec, 1000000000);
2120         wc.sec = (u32)wall_nsec; /* overflow in 2106 guest time */
2121         wc.version = version;
2122
2123         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
2124
2125         if (sec_hi_ofs) {
2126                 wc_sec_hi = wall_nsec >> 32;
2127                 kvm_write_guest(kvm, wall_clock + sec_hi_ofs,
2128                                 &wc_sec_hi, sizeof(wc_sec_hi));
2129         }
2130
2131         version++;
2132         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
2133 }
2134
2135 static void kvm_write_system_time(struct kvm_vcpu *vcpu, gpa_t system_time,
2136                                   bool old_msr, bool host_initiated)
2137 {
2138         struct kvm_arch *ka = &vcpu->kvm->arch;
2139
2140         if (vcpu->vcpu_id == 0 && !host_initiated) {
2141                 if (ka->boot_vcpu_runs_old_kvmclock != old_msr)
2142                         kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
2143
2144                 ka->boot_vcpu_runs_old_kvmclock = old_msr;
2145         }
2146
2147         vcpu->arch.time = system_time;
2148         kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
2149
2150         /* we verify if the enable bit is set... */
2151         vcpu->arch.pv_time_enabled = false;
2152         if (!(system_time & 1))
2153                 return;
2154
2155         if (!kvm_gfn_to_hva_cache_init(vcpu->kvm,
2156                                        &vcpu->arch.pv_time, system_time & ~1ULL,
2157                                        sizeof(struct pvclock_vcpu_time_info)))
2158                 vcpu->arch.pv_time_enabled = true;
2159
2160         return;
2161 }
2162
2163 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
2164 {
2165         do_shl32_div32(dividend, divisor);
2166         return dividend;
2167 }
2168
2169 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz,
2170                                s8 *pshift, u32 *pmultiplier)
2171 {
2172         uint64_t scaled64;
2173         int32_t  shift = 0;
2174         uint64_t tps64;
2175         uint32_t tps32;
2176
2177         tps64 = base_hz;
2178         scaled64 = scaled_hz;
2179         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
2180                 tps64 >>= 1;
2181                 shift--;
2182         }
2183
2184         tps32 = (uint32_t)tps64;
2185         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
2186                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
2187                         scaled64 >>= 1;
2188                 else
2189                         tps32 <<= 1;
2190                 shift++;
2191         }
2192
2193         *pshift = shift;
2194         *pmultiplier = div_frac(scaled64, tps32);
2195 }
2196
2197 #ifdef CONFIG_X86_64
2198 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0);
2199 #endif
2200
2201 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
2202 static unsigned long max_tsc_khz;
2203
2204 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
2205 {
2206         u64 v = (u64)khz * (1000000 + ppm);
2207         do_div(v, 1000000);
2208         return v;
2209 }
2210
2211 static void kvm_vcpu_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 l1_multiplier);
2212
2213 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
2214 {
2215         u64 ratio;
2216
2217         /* Guest TSC same frequency as host TSC? */
2218         if (!scale) {
2219                 kvm_vcpu_write_tsc_multiplier(vcpu, kvm_default_tsc_scaling_ratio);
2220                 return 0;
2221         }
2222
2223         /* TSC scaling supported? */
2224         if (!kvm_has_tsc_control) {
2225                 if (user_tsc_khz > tsc_khz) {
2226                         vcpu->arch.tsc_catchup = 1;
2227                         vcpu->arch.tsc_always_catchup = 1;
2228                         return 0;
2229                 } else {
2230                         pr_warn_ratelimited("user requested TSC rate below hardware speed\n");
2231                         return -1;
2232                 }
2233         }
2234
2235         /* TSC scaling required  - calculate ratio */
2236         ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits,
2237                                 user_tsc_khz, tsc_khz);
2238
2239         if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) {
2240                 pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
2241                                     user_tsc_khz);
2242                 return -1;
2243         }
2244
2245         kvm_vcpu_write_tsc_multiplier(vcpu, ratio);
2246         return 0;
2247 }
2248
2249 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
2250 {
2251         u32 thresh_lo, thresh_hi;
2252         int use_scaling = 0;
2253
2254         /* tsc_khz can be zero if TSC calibration fails */
2255         if (user_tsc_khz == 0) {
2256                 /* set tsc_scaling_ratio to a safe value */
2257                 kvm_vcpu_write_tsc_multiplier(vcpu, kvm_default_tsc_scaling_ratio);
2258                 return -1;
2259         }
2260
2261         /* Compute a scale to convert nanoseconds in TSC cycles */
2262         kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC,
2263                            &vcpu->arch.virtual_tsc_shift,
2264                            &vcpu->arch.virtual_tsc_mult);
2265         vcpu->arch.virtual_tsc_khz = user_tsc_khz;
2266
2267         /*
2268          * Compute the variation in TSC rate which is acceptable
2269          * within the range of tolerance and decide if the
2270          * rate being applied is within that bounds of the hardware
2271          * rate.  If so, no scaling or compensation need be done.
2272          */
2273         thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
2274         thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
2275         if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) {
2276                 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi);
2277                 use_scaling = 1;
2278         }
2279         return set_tsc_khz(vcpu, user_tsc_khz, use_scaling);
2280 }
2281
2282 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
2283 {
2284         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
2285                                       vcpu->arch.virtual_tsc_mult,
2286                                       vcpu->arch.virtual_tsc_shift);
2287         tsc += vcpu->arch.this_tsc_write;
2288         return tsc;
2289 }
2290
2291 static inline int gtod_is_based_on_tsc(int mode)
2292 {
2293         return mode == VDSO_CLOCKMODE_TSC || mode == VDSO_CLOCKMODE_HVCLOCK;
2294 }
2295
2296 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
2297 {
2298 #ifdef CONFIG_X86_64
2299         bool vcpus_matched;
2300         struct kvm_arch *ka = &vcpu->kvm->arch;
2301         struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2302
2303         vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
2304                          atomic_read(&vcpu->kvm->online_vcpus));
2305
2306         /*
2307          * Once the masterclock is enabled, always perform request in
2308          * order to update it.
2309          *
2310          * In order to enable masterclock, the host clocksource must be TSC
2311          * and the vcpus need to have matched TSCs.  When that happens,
2312          * perform request to enable masterclock.
2313          */
2314         if (ka->use_master_clock ||
2315             (gtod_is_based_on_tsc(gtod->clock.vclock_mode) && vcpus_matched))
2316                 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
2317
2318         trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc,
2319                             atomic_read(&vcpu->kvm->online_vcpus),
2320                             ka->use_master_clock, gtod->clock.vclock_mode);
2321 #endif
2322 }
2323
2324 /*
2325  * Multiply tsc by a fixed point number represented by ratio.
2326  *
2327  * The most significant 64-N bits (mult) of ratio represent the
2328  * integral part of the fixed point number; the remaining N bits
2329  * (frac) represent the fractional part, ie. ratio represents a fixed
2330  * point number (mult + frac * 2^(-N)).
2331  *
2332  * N equals to kvm_tsc_scaling_ratio_frac_bits.
2333  */
2334 static inline u64 __scale_tsc(u64 ratio, u64 tsc)
2335 {
2336         return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits);
2337 }
2338
2339 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc, u64 ratio)
2340 {
2341         u64 _tsc = tsc;
2342
2343         if (ratio != kvm_default_tsc_scaling_ratio)
2344                 _tsc = __scale_tsc(ratio, tsc);
2345
2346         return _tsc;
2347 }
2348 EXPORT_SYMBOL_GPL(kvm_scale_tsc);
2349
2350 static u64 kvm_compute_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
2351 {
2352         u64 tsc;
2353
2354         tsc = kvm_scale_tsc(vcpu, rdtsc(), vcpu->arch.l1_tsc_scaling_ratio);
2355
2356         return target_tsc - tsc;
2357 }
2358
2359 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
2360 {
2361         return vcpu->arch.l1_tsc_offset +
2362                 kvm_scale_tsc(vcpu, host_tsc, vcpu->arch.l1_tsc_scaling_ratio);
2363 }
2364 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc);
2365
2366 u64 kvm_calc_nested_tsc_offset(u64 l1_offset, u64 l2_offset, u64 l2_multiplier)
2367 {
2368         u64 nested_offset;
2369
2370         if (l2_multiplier == kvm_default_tsc_scaling_ratio)
2371                 nested_offset = l1_offset;
2372         else
2373                 nested_offset = mul_s64_u64_shr((s64) l1_offset, l2_multiplier,
2374                                                 kvm_tsc_scaling_ratio_frac_bits);
2375
2376         nested_offset += l2_offset;
2377         return nested_offset;
2378 }
2379 EXPORT_SYMBOL_GPL(kvm_calc_nested_tsc_offset);
2380
2381 u64 kvm_calc_nested_tsc_multiplier(u64 l1_multiplier, u64 l2_multiplier)
2382 {
2383         if (l2_multiplier != kvm_default_tsc_scaling_ratio)
2384                 return mul_u64_u64_shr(l1_multiplier, l2_multiplier,
2385                                        kvm_tsc_scaling_ratio_frac_bits);
2386
2387         return l1_multiplier;
2388 }
2389 EXPORT_SYMBOL_GPL(kvm_calc_nested_tsc_multiplier);
2390
2391 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 l1_offset)
2392 {
2393         trace_kvm_write_tsc_offset(vcpu->vcpu_id,
2394                                    vcpu->arch.l1_tsc_offset,
2395                                    l1_offset);
2396
2397         vcpu->arch.l1_tsc_offset = l1_offset;
2398
2399         /*
2400          * If we are here because L1 chose not to trap WRMSR to TSC then
2401          * according to the spec this should set L1's TSC (as opposed to
2402          * setting L1's offset for L2).
2403          */
2404         if (is_guest_mode(vcpu))
2405                 vcpu->arch.tsc_offset = kvm_calc_nested_tsc_offset(
2406                         l1_offset,
2407                         static_call(kvm_x86_get_l2_tsc_offset)(vcpu),
2408                         static_call(kvm_x86_get_l2_tsc_multiplier)(vcpu));
2409         else
2410                 vcpu->arch.tsc_offset = l1_offset;
2411
2412         static_call(kvm_x86_write_tsc_offset)(vcpu, vcpu->arch.tsc_offset);
2413 }
2414
2415 static void kvm_vcpu_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 l1_multiplier)
2416 {
2417         vcpu->arch.l1_tsc_scaling_ratio = l1_multiplier;
2418
2419         /* Userspace is changing the multiplier while L2 is active */
2420         if (is_guest_mode(vcpu))
2421                 vcpu->arch.tsc_scaling_ratio = kvm_calc_nested_tsc_multiplier(
2422                         l1_multiplier,
2423                         static_call(kvm_x86_get_l2_tsc_multiplier)(vcpu));
2424         else
2425                 vcpu->arch.tsc_scaling_ratio = l1_multiplier;
2426
2427         if (kvm_has_tsc_control)
2428                 static_call(kvm_x86_write_tsc_multiplier)(
2429                         vcpu, vcpu->arch.tsc_scaling_ratio);
2430 }
2431
2432 static inline bool kvm_check_tsc_unstable(void)
2433 {
2434 #ifdef CONFIG_X86_64
2435         /*
2436          * TSC is marked unstable when we're running on Hyper-V,
2437          * 'TSC page' clocksource is good.
2438          */
2439         if (pvclock_gtod_data.clock.vclock_mode == VDSO_CLOCKMODE_HVCLOCK)
2440                 return false;
2441 #endif
2442         return check_tsc_unstable();
2443 }
2444
2445 static void kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 data)
2446 {
2447         struct kvm *kvm = vcpu->kvm;
2448         u64 offset, ns, elapsed;
2449         unsigned long flags;
2450         bool matched;
2451         bool already_matched;
2452         bool synchronizing = false;
2453
2454         raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
2455         offset = kvm_compute_l1_tsc_offset(vcpu, data);
2456         ns = get_kvmclock_base_ns();
2457         elapsed = ns - kvm->arch.last_tsc_nsec;
2458
2459         if (vcpu->arch.virtual_tsc_khz) {
2460                 if (data == 0) {
2461                         /*
2462                          * detection of vcpu initialization -- need to sync
2463                          * with other vCPUs. This particularly helps to keep
2464                          * kvm_clock stable after CPU hotplug
2465                          */
2466                         synchronizing = true;
2467                 } else {
2468                         u64 tsc_exp = kvm->arch.last_tsc_write +
2469                                                 nsec_to_cycles(vcpu, elapsed);
2470                         u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL;
2471                         /*
2472                          * Special case: TSC write with a small delta (1 second)
2473                          * of virtual cycle time against real time is
2474                          * interpreted as an attempt to synchronize the CPU.
2475                          */
2476                         synchronizing = data < tsc_exp + tsc_hz &&
2477                                         data + tsc_hz > tsc_exp;
2478                 }
2479         }
2480
2481         /*
2482          * For a reliable TSC, we can match TSC offsets, and for an unstable
2483          * TSC, we add elapsed time in this computation.  We could let the
2484          * compensation code attempt to catch up if we fall behind, but
2485          * it's better to try to match offsets from the beginning.
2486          */
2487         if (synchronizing &&
2488             vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
2489                 if (!kvm_check_tsc_unstable()) {
2490                         offset = kvm->arch.cur_tsc_offset;
2491                 } else {
2492                         u64 delta = nsec_to_cycles(vcpu, elapsed);
2493                         data += delta;
2494                         offset = kvm_compute_l1_tsc_offset(vcpu, data);
2495                 }
2496                 matched = true;
2497                 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation);
2498         } else {
2499                 /*
2500                  * We split periods of matched TSC writes into generations.
2501                  * For each generation, we track the original measured
2502                  * nanosecond time, offset, and write, so if TSCs are in
2503                  * sync, we can match exact offset, and if not, we can match
2504                  * exact software computation in compute_guest_tsc()
2505                  *
2506                  * These values are tracked in kvm->arch.cur_xxx variables.
2507                  */
2508                 kvm->arch.cur_tsc_generation++;
2509                 kvm->arch.cur_tsc_nsec = ns;
2510                 kvm->arch.cur_tsc_write = data;
2511                 kvm->arch.cur_tsc_offset = offset;
2512                 matched = false;
2513         }
2514
2515         /*
2516          * We also track th most recent recorded KHZ, write and time to
2517          * allow the matching interval to be extended at each write.
2518          */
2519         kvm->arch.last_tsc_nsec = ns;
2520         kvm->arch.last_tsc_write = data;
2521         kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
2522
2523         vcpu->arch.last_guest_tsc = data;
2524
2525         /* Keep track of which generation this VCPU has synchronized to */
2526         vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
2527         vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
2528         vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
2529
2530         kvm_vcpu_write_tsc_offset(vcpu, offset);
2531         raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
2532
2533         spin_lock_irqsave(&kvm->arch.pvclock_gtod_sync_lock, flags);
2534         if (!matched) {
2535                 kvm->arch.nr_vcpus_matched_tsc = 0;
2536         } else if (!already_matched) {
2537                 kvm->arch.nr_vcpus_matched_tsc++;
2538         }
2539
2540         kvm_track_tsc_matching(vcpu);
2541         spin_unlock_irqrestore(&kvm->arch.pvclock_gtod_sync_lock, flags);
2542 }
2543
2544 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
2545                                            s64 adjustment)
2546 {
2547         u64 tsc_offset = vcpu->arch.l1_tsc_offset;
2548         kvm_vcpu_write_tsc_offset(vcpu, tsc_offset + adjustment);
2549 }
2550
2551 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
2552 {
2553         if (vcpu->arch.l1_tsc_scaling_ratio != kvm_default_tsc_scaling_ratio)
2554                 WARN_ON(adjustment < 0);
2555         adjustment = kvm_scale_tsc(vcpu, (u64) adjustment,
2556                                    vcpu->arch.l1_tsc_scaling_ratio);
2557         adjust_tsc_offset_guest(vcpu, adjustment);
2558 }
2559
2560 #ifdef CONFIG_X86_64
2561
2562 static u64 read_tsc(void)
2563 {
2564         u64 ret = (u64)rdtsc_ordered();
2565         u64 last = pvclock_gtod_data.clock.cycle_last;
2566
2567         if (likely(ret >= last))
2568                 return ret;
2569
2570         /*
2571          * GCC likes to generate cmov here, but this branch is extremely
2572          * predictable (it's just a function of time and the likely is
2573          * very likely) and there's a data dependence, so force GCC
2574          * to generate a branch instead.  I don't barrier() because
2575          * we don't actually need a barrier, and if this function
2576          * ever gets inlined it will generate worse code.
2577          */
2578         asm volatile ("");
2579         return last;
2580 }
2581
2582 static inline u64 vgettsc(struct pvclock_clock *clock, u64 *tsc_timestamp,
2583                           int *mode)
2584 {
2585         long v;
2586         u64 tsc_pg_val;
2587
2588         switch (clock->vclock_mode) {
2589         case VDSO_CLOCKMODE_HVCLOCK:
2590                 tsc_pg_val = hv_read_tsc_page_tsc(hv_get_tsc_page(),
2591                                                   tsc_timestamp);
2592                 if (tsc_pg_val != U64_MAX) {
2593                         /* TSC page valid */
2594                         *mode = VDSO_CLOCKMODE_HVCLOCK;
2595                         v = (tsc_pg_val - clock->cycle_last) &
2596                                 clock->mask;
2597                 } else {
2598                         /* TSC page invalid */
2599                         *mode = VDSO_CLOCKMODE_NONE;
2600                 }
2601                 break;
2602         case VDSO_CLOCKMODE_TSC:
2603                 *mode = VDSO_CLOCKMODE_TSC;
2604                 *tsc_timestamp = read_tsc();
2605                 v = (*tsc_timestamp - clock->cycle_last) &
2606                         clock->mask;
2607                 break;
2608         default:
2609                 *mode = VDSO_CLOCKMODE_NONE;
2610         }
2611
2612         if (*mode == VDSO_CLOCKMODE_NONE)
2613                 *tsc_timestamp = v = 0;
2614
2615         return v * clock->mult;
2616 }
2617
2618 static int do_monotonic_raw(s64 *t, u64 *tsc_timestamp)
2619 {
2620         struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2621         unsigned long seq;
2622         int mode;
2623         u64 ns;
2624
2625         do {
2626                 seq = read_seqcount_begin(&gtod->seq);
2627                 ns = gtod->raw_clock.base_cycles;
2628                 ns += vgettsc(&gtod->raw_clock, tsc_timestamp, &mode);
2629                 ns >>= gtod->raw_clock.shift;
2630                 ns += ktime_to_ns(ktime_add(gtod->raw_clock.offset, gtod->offs_boot));
2631         } while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
2632         *t = ns;
2633
2634         return mode;
2635 }
2636
2637 static int do_realtime(struct timespec64 *ts, u64 *tsc_timestamp)
2638 {
2639         struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2640         unsigned long seq;
2641         int mode;
2642         u64 ns;
2643
2644         do {
2645                 seq = read_seqcount_begin(&gtod->seq);
2646                 ts->tv_sec = gtod->wall_time_sec;
2647                 ns = gtod->clock.base_cycles;
2648                 ns += vgettsc(&gtod->clock, tsc_timestamp, &mode);
2649                 ns >>= gtod->clock.shift;
2650         } while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
2651
2652         ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
2653         ts->tv_nsec = ns;
2654
2655         return mode;
2656 }
2657
2658 /* returns true if host is using TSC based clocksource */
2659 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp)
2660 {
2661         /* checked again under seqlock below */
2662         if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode))
2663                 return false;
2664
2665         return gtod_is_based_on_tsc(do_monotonic_raw(kernel_ns,
2666                                                       tsc_timestamp));
2667 }
2668
2669 /* returns true if host is using TSC based clocksource */
2670 static bool kvm_get_walltime_and_clockread(struct timespec64 *ts,
2671                                            u64 *tsc_timestamp)
2672 {
2673         /* checked again under seqlock below */
2674         if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode))
2675                 return false;
2676
2677         return gtod_is_based_on_tsc(do_realtime(ts, tsc_timestamp));
2678 }
2679 #endif
2680
2681 /*
2682  *
2683  * Assuming a stable TSC across physical CPUS, and a stable TSC
2684  * across virtual CPUs, the following condition is possible.
2685  * Each numbered line represents an event visible to both
2686  * CPUs at the next numbered event.
2687  *
2688  * "timespecX" represents host monotonic time. "tscX" represents
2689  * RDTSC value.
2690  *
2691  *              VCPU0 on CPU0           |       VCPU1 on CPU1
2692  *
2693  * 1.  read timespec0,tsc0
2694  * 2.                                   | timespec1 = timespec0 + N
2695  *                                      | tsc1 = tsc0 + M
2696  * 3. transition to guest               | transition to guest
2697  * 4. ret0 = timespec0 + (rdtsc - tsc0) |
2698  * 5.                                   | ret1 = timespec1 + (rdtsc - tsc1)
2699  *                                      | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
2700  *
2701  * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
2702  *
2703  *      - ret0 < ret1
2704  *      - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
2705  *              ...
2706  *      - 0 < N - M => M < N
2707  *
2708  * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
2709  * always the case (the difference between two distinct xtime instances
2710  * might be smaller then the difference between corresponding TSC reads,
2711  * when updating guest vcpus pvclock areas).
2712  *
2713  * To avoid that problem, do not allow visibility of distinct
2714  * system_timestamp/tsc_timestamp values simultaneously: use a master
2715  * copy of host monotonic time values. Update that master copy
2716  * in lockstep.
2717  *
2718  * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
2719  *
2720  */
2721
2722 static void pvclock_update_vm_gtod_copy(struct kvm *kvm)
2723 {
2724 #ifdef CONFIG_X86_64
2725         struct kvm_arch *ka = &kvm->arch;
2726         int vclock_mode;
2727         bool host_tsc_clocksource, vcpus_matched;
2728
2729         vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
2730                         atomic_read(&kvm->online_vcpus));
2731
2732         /*
2733          * If the host uses TSC clock, then passthrough TSC as stable
2734          * to the guest.
2735          */
2736         host_tsc_clocksource = kvm_get_time_and_clockread(
2737                                         &ka->master_kernel_ns,
2738                                         &ka->master_cycle_now);
2739
2740         ka->use_master_clock = host_tsc_clocksource && vcpus_matched
2741                                 && !ka->backwards_tsc_observed
2742                                 && !ka->boot_vcpu_runs_old_kvmclock;
2743
2744         if (ka->use_master_clock)
2745                 atomic_set(&kvm_guest_has_master_clock, 1);
2746
2747         vclock_mode = pvclock_gtod_data.clock.vclock_mode;
2748         trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode,
2749                                         vcpus_matched);
2750 #endif
2751 }
2752
2753 void kvm_make_mclock_inprogress_request(struct kvm *kvm)
2754 {
2755         kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
2756 }
2757
2758 static void kvm_gen_update_masterclock(struct kvm *kvm)
2759 {
2760 #ifdef CONFIG_X86_64
2761         int i;
2762         struct kvm_vcpu *vcpu;
2763         struct kvm_arch *ka = &kvm->arch;
2764         unsigned long flags;
2765
2766         kvm_hv_invalidate_tsc_page(kvm);
2767
2768         kvm_make_mclock_inprogress_request(kvm);
2769
2770         /* no guest entries from this point */
2771         spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
2772         pvclock_update_vm_gtod_copy(kvm);
2773         spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
2774
2775         kvm_for_each_vcpu(i, vcpu, kvm)
2776                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2777
2778         /* guest entries allowed */
2779         kvm_for_each_vcpu(i, vcpu, kvm)
2780                 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
2781 #endif
2782 }
2783
2784 u64 get_kvmclock_ns(struct kvm *kvm)
2785 {
2786         struct kvm_arch *ka = &kvm->arch;
2787         struct pvclock_vcpu_time_info hv_clock;
2788         unsigned long flags;
2789         u64 ret;
2790
2791         spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
2792         if (!ka->use_master_clock) {
2793                 spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
2794                 return get_kvmclock_base_ns() + ka->kvmclock_offset;
2795         }
2796
2797         hv_clock.tsc_timestamp = ka->master_cycle_now;
2798         hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
2799         spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
2800
2801         /* both __this_cpu_read() and rdtsc() should be on the same cpu */
2802         get_cpu();
2803
2804         if (__this_cpu_read(cpu_tsc_khz)) {
2805                 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL,
2806                                    &hv_clock.tsc_shift,
2807                                    &hv_clock.tsc_to_system_mul);
2808                 ret = __pvclock_read_cycles(&hv_clock, rdtsc());
2809         } else
2810                 ret = get_kvmclock_base_ns() + ka->kvmclock_offset;
2811
2812         put_cpu();
2813
2814         return ret;
2815 }
2816
2817 static void kvm_setup_pvclock_page(struct kvm_vcpu *v,
2818                                    struct gfn_to_hva_cache *cache,
2819                                    unsigned int offset)
2820 {
2821         struct kvm_vcpu_arch *vcpu = &v->arch;
2822         struct pvclock_vcpu_time_info guest_hv_clock;
2823
2824         if (unlikely(kvm_read_guest_offset_cached(v->kvm, cache,
2825                 &guest_hv_clock, offset, sizeof(guest_hv_clock))))
2826                 return;
2827
2828         /* This VCPU is paused, but it's legal for a guest to read another
2829          * VCPU's kvmclock, so we really have to follow the specification where
2830          * it says that version is odd if data is being modified, and even after
2831          * it is consistent.
2832          *
2833          * Version field updates must be kept separate.  This is because
2834          * kvm_write_guest_cached might use a "rep movs" instruction, and
2835          * writes within a string instruction are weakly ordered.  So there
2836          * are three writes overall.
2837          *
2838          * As a small optimization, only write the version field in the first
2839          * and third write.  The vcpu->pv_time cache is still valid, because the
2840          * version field is the first in the struct.
2841          */
2842         BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0);
2843
2844         if (guest_hv_clock.version & 1)
2845                 ++guest_hv_clock.version;  /* first time write, random junk */
2846
2847         vcpu->hv_clock.version = guest_hv_clock.version + 1;
2848         kvm_write_guest_offset_cached(v->kvm, cache,
2849                                       &vcpu->hv_clock, offset,
2850                                       sizeof(vcpu->hv_clock.version));
2851
2852         smp_wmb();
2853
2854         /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
2855         vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED);
2856
2857         if (vcpu->pvclock_set_guest_stopped_request) {
2858                 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED;
2859                 vcpu->pvclock_set_guest_stopped_request = false;
2860         }
2861
2862         trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
2863
2864         kvm_write_guest_offset_cached(v->kvm, cache,
2865                                       &vcpu->hv_clock, offset,
2866                                       sizeof(vcpu->hv_clock));
2867
2868         smp_wmb();
2869
2870         vcpu->hv_clock.version++;
2871         kvm_write_guest_offset_cached(v->kvm, cache,
2872                                      &vcpu->hv_clock, offset,
2873                                      sizeof(vcpu->hv_clock.version));
2874 }
2875
2876 static int kvm_guest_time_update(struct kvm_vcpu *v)
2877 {
2878         unsigned long flags, tgt_tsc_khz;
2879         struct kvm_vcpu_arch *vcpu = &v->arch;
2880         struct kvm_arch *ka = &v->kvm->arch;
2881         s64 kernel_ns;
2882         u64 tsc_timestamp, host_tsc;
2883         u8 pvclock_flags;
2884         bool use_master_clock;
2885
2886         kernel_ns = 0;
2887         host_tsc = 0;
2888
2889         /*
2890          * If the host uses TSC clock, then passthrough TSC as stable
2891          * to the guest.
2892          */
2893         spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
2894         use_master_clock = ka->use_master_clock;
2895         if (use_master_clock) {
2896                 host_tsc = ka->master_cycle_now;
2897                 kernel_ns = ka->master_kernel_ns;
2898         }
2899         spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
2900
2901         /* Keep irq disabled to prevent changes to the clock */
2902         local_irq_save(flags);
2903         tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz);
2904         if (unlikely(tgt_tsc_khz == 0)) {
2905                 local_irq_restore(flags);
2906                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
2907                 return 1;
2908         }
2909         if (!use_master_clock) {
2910                 host_tsc = rdtsc();
2911                 kernel_ns = get_kvmclock_base_ns();
2912         }
2913
2914         tsc_timestamp = kvm_read_l1_tsc(v, host_tsc);
2915
2916         /*
2917          * We may have to catch up the TSC to match elapsed wall clock
2918          * time for two reasons, even if kvmclock is used.
2919          *   1) CPU could have been running below the maximum TSC rate
2920          *   2) Broken TSC compensation resets the base at each VCPU
2921          *      entry to avoid unknown leaps of TSC even when running
2922          *      again on the same CPU.  This may cause apparent elapsed
2923          *      time to disappear, and the guest to stand still or run
2924          *      very slowly.
2925          */
2926         if (vcpu->tsc_catchup) {
2927                 u64 tsc = compute_guest_tsc(v, kernel_ns);
2928                 if (tsc > tsc_timestamp) {
2929                         adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
2930                         tsc_timestamp = tsc;
2931                 }
2932         }
2933
2934         local_irq_restore(flags);
2935
2936         /* With all the info we got, fill in the values */
2937
2938         if (kvm_has_tsc_control)
2939                 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz,
2940                                             v->arch.l1_tsc_scaling_ratio);
2941
2942         if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) {
2943                 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL,
2944                                    &vcpu->hv_clock.tsc_shift,
2945                                    &vcpu->hv_clock.tsc_to_system_mul);
2946                 vcpu->hw_tsc_khz = tgt_tsc_khz;
2947         }
2948
2949         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
2950         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
2951         vcpu->last_guest_tsc = tsc_timestamp;
2952
2953         /* If the host uses TSC clocksource, then it is stable */
2954         pvclock_flags = 0;
2955         if (use_master_clock)
2956                 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
2957
2958         vcpu->hv_clock.flags = pvclock_flags;
2959
2960         if (vcpu->pv_time_enabled)
2961                 kvm_setup_pvclock_page(v, &vcpu->pv_time, 0);
2962         if (vcpu->xen.vcpu_info_set)
2963                 kvm_setup_pvclock_page(v, &vcpu->xen.vcpu_info_cache,
2964                                        offsetof(struct compat_vcpu_info, time));
2965         if (vcpu->xen.vcpu_time_info_set)
2966                 kvm_setup_pvclock_page(v, &vcpu->xen.vcpu_time_info_cache, 0);
2967         if (v == kvm_get_vcpu(v->kvm, 0))
2968                 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock);
2969         return 0;
2970 }
2971
2972 /*
2973  * kvmclock updates which are isolated to a given vcpu, such as
2974  * vcpu->cpu migration, should not allow system_timestamp from
2975  * the rest of the vcpus to remain static. Otherwise ntp frequency
2976  * correction applies to one vcpu's system_timestamp but not
2977  * the others.
2978  *
2979  * So in those cases, request a kvmclock update for all vcpus.
2980  * We need to rate-limit these requests though, as they can
2981  * considerably slow guests that have a large number of vcpus.
2982  * The time for a remote vcpu to update its kvmclock is bound
2983  * by the delay we use to rate-limit the updates.
2984  */
2985
2986 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
2987
2988 static void kvmclock_update_fn(struct work_struct *work)
2989 {
2990         int i;
2991         struct delayed_work *dwork = to_delayed_work(work);
2992         struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
2993                                            kvmclock_update_work);
2994         struct kvm *kvm = container_of(ka, struct kvm, arch);
2995         struct kvm_vcpu *vcpu;
2996
2997         kvm_for_each_vcpu(i, vcpu, kvm) {
2998                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2999                 kvm_vcpu_kick(vcpu);
3000         }
3001 }
3002
3003 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
3004 {
3005         struct kvm *kvm = v->kvm;
3006
3007         kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
3008         schedule_delayed_work(&kvm->arch.kvmclock_update_work,
3009                                         KVMCLOCK_UPDATE_DELAY);
3010 }
3011
3012 #define KVMCLOCK_SYNC_PERIOD (300 * HZ)
3013
3014 static void kvmclock_sync_fn(struct work_struct *work)
3015 {
3016         struct delayed_work *dwork = to_delayed_work(work);
3017         struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
3018                                            kvmclock_sync_work);
3019         struct kvm *kvm = container_of(ka, struct kvm, arch);
3020
3021         if (!kvmclock_periodic_sync)
3022                 return;
3023
3024         schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0);
3025         schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
3026                                         KVMCLOCK_SYNC_PERIOD);
3027 }
3028
3029 /*
3030  * On AMD, HWCR[McStatusWrEn] controls whether setting MCi_STATUS results in #GP.
3031  */
3032 static bool can_set_mci_status(struct kvm_vcpu *vcpu)
3033 {
3034         /* McStatusWrEn enabled? */
3035         if (guest_cpuid_is_amd_or_hygon(vcpu))
3036                 return !!(vcpu->arch.msr_hwcr & BIT_ULL(18));
3037
3038         return false;
3039 }
3040
3041 static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3042 {
3043         u64 mcg_cap = vcpu->arch.mcg_cap;
3044         unsigned bank_num = mcg_cap & 0xff;
3045         u32 msr = msr_info->index;
3046         u64 data = msr_info->data;
3047
3048         switch (msr) {
3049         case MSR_IA32_MCG_STATUS:
3050                 vcpu->arch.mcg_status = data;
3051                 break;
3052         case MSR_IA32_MCG_CTL:
3053                 if (!(mcg_cap & MCG_CTL_P) &&
3054                     (data || !msr_info->host_initiated))
3055                         return 1;
3056                 if (data != 0 && data != ~(u64)0)
3057                         return 1;
3058                 vcpu->arch.mcg_ctl = data;
3059                 break;
3060         default:
3061                 if (msr >= MSR_IA32_MC0_CTL &&
3062                     msr < MSR_IA32_MCx_CTL(bank_num)) {
3063                         u32 offset = array_index_nospec(
3064                                 msr - MSR_IA32_MC0_CTL,
3065                                 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL);
3066
3067                         /* only 0 or all 1s can be written to IA32_MCi_CTL
3068                          * some Linux kernels though clear bit 10 in bank 4 to
3069                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
3070                          * this to avoid an uncatched #GP in the guest
3071                          */
3072                         if ((offset & 0x3) == 0 &&
3073                             data != 0 && (data | (1 << 10)) != ~(u64)0)
3074                                 return -1;
3075
3076                         /* MCi_STATUS */
3077                         if (!msr_info->host_initiated &&
3078                             (offset & 0x3) == 1 && data != 0) {
3079                                 if (!can_set_mci_status(vcpu))
3080                                         return -1;
3081                         }
3082
3083                         vcpu->arch.mce_banks[offset] = data;
3084                         break;
3085                 }
3086                 return 1;
3087         }
3088         return 0;
3089 }
3090
3091 static inline bool kvm_pv_async_pf_enabled(struct kvm_vcpu *vcpu)
3092 {
3093         u64 mask = KVM_ASYNC_PF_ENABLED | KVM_ASYNC_PF_DELIVERY_AS_INT;
3094
3095         return (vcpu->arch.apf.msr_en_val & mask) == mask;
3096 }
3097
3098 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
3099 {
3100         gpa_t gpa = data & ~0x3f;
3101
3102         /* Bits 4:5 are reserved, Should be zero */
3103         if (data & 0x30)
3104                 return 1;
3105
3106         if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_VMEXIT) &&
3107             (data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT))
3108                 return 1;
3109
3110         if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT) &&
3111             (data & KVM_ASYNC_PF_DELIVERY_AS_INT))
3112                 return 1;
3113
3114         if (!lapic_in_kernel(vcpu))
3115                 return data ? 1 : 0;
3116
3117         vcpu->arch.apf.msr_en_val = data;
3118
3119         if (!kvm_pv_async_pf_enabled(vcpu)) {
3120                 kvm_clear_async_pf_completion_queue(vcpu);
3121                 kvm_async_pf_hash_reset(vcpu);
3122                 return 0;
3123         }
3124
3125         if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
3126                                         sizeof(u64)))
3127                 return 1;
3128
3129         vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
3130         vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT;
3131
3132         kvm_async_pf_wakeup_all(vcpu);
3133
3134         return 0;
3135 }
3136
3137 static int kvm_pv_enable_async_pf_int(struct kvm_vcpu *vcpu, u64 data)
3138 {
3139         /* Bits 8-63 are reserved */
3140         if (data >> 8)
3141                 return 1;
3142
3143         if (!lapic_in_kernel(vcpu))
3144                 return 1;
3145
3146         vcpu->arch.apf.msr_int_val = data;
3147
3148         vcpu->arch.apf.vec = data & KVM_ASYNC_PF_VEC_MASK;
3149
3150         return 0;
3151 }
3152
3153 static void kvmclock_reset(struct kvm_vcpu *vcpu)
3154 {
3155         vcpu->arch.pv_time_enabled = false;
3156         vcpu->arch.time = 0;
3157 }
3158
3159 static void kvm_vcpu_flush_tlb_all(struct kvm_vcpu *vcpu)
3160 {
3161         ++vcpu->stat.tlb_flush;
3162         static_call(kvm_x86_tlb_flush_all)(vcpu);
3163 }
3164
3165 static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu)
3166 {
3167         ++vcpu->stat.tlb_flush;
3168
3169         if (!tdp_enabled) {
3170                /*
3171                  * A TLB flush on behalf of the guest is equivalent to
3172                  * INVPCID(all), toggling CR4.PGE, etc., which requires
3173                  * a forced sync of the shadow page tables.  Unload the
3174                  * entire MMU here and the subsequent load will sync the
3175                  * shadow page tables, and also flush the TLB.
3176                  */
3177                 kvm_mmu_unload(vcpu);
3178                 return;
3179         }
3180
3181         static_call(kvm_x86_tlb_flush_guest)(vcpu);
3182 }
3183
3184 static void record_steal_time(struct kvm_vcpu *vcpu)
3185 {
3186         struct kvm_host_map map;
3187         struct kvm_steal_time *st;
3188
3189         if (kvm_xen_msr_enabled(vcpu->kvm)) {
3190                 kvm_xen_runstate_set_running(vcpu);
3191                 return;
3192         }
3193
3194         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
3195                 return;
3196
3197         /* -EAGAIN is returned in atomic context so we can just return. */
3198         if (kvm_map_gfn(vcpu, vcpu->arch.st.msr_val >> PAGE_SHIFT,
3199                         &map, &vcpu->arch.st.cache, false))
3200                 return;
3201
3202         st = map.hva +
3203                 offset_in_page(vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS);
3204
3205         /*
3206          * Doing a TLB flush here, on the guest's behalf, can avoid
3207          * expensive IPIs.
3208          */
3209         if (guest_pv_has(vcpu, KVM_FEATURE_PV_TLB_FLUSH)) {
3210                 u8 st_preempted = xchg(&st->preempted, 0);
3211
3212                 trace_kvm_pv_tlb_flush(vcpu->vcpu_id,
3213                                        st_preempted & KVM_VCPU_FLUSH_TLB);
3214                 if (st_preempted & KVM_VCPU_FLUSH_TLB)
3215                         kvm_vcpu_flush_tlb_guest(vcpu);
3216         } else {
3217                 st->preempted = 0;
3218         }
3219
3220         vcpu->arch.st.preempted = 0;
3221
3222         if (st->version & 1)
3223                 st->version += 1;  /* first time write, random junk */
3224
3225         st->version += 1;
3226
3227         smp_wmb();
3228
3229         st->steal += current->sched_info.run_delay -
3230                 vcpu->arch.st.last_steal;
3231         vcpu->arch.st.last_steal = current->sched_info.run_delay;
3232
3233         smp_wmb();
3234
3235         st->version += 1;
3236
3237         kvm_unmap_gfn(vcpu, &map, &vcpu->arch.st.cache, true, false);
3238 }
3239
3240 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3241 {
3242         bool pr = false;
3243         u32 msr = msr_info->index;
3244         u64 data = msr_info->data;
3245
3246         if (msr && msr == vcpu->kvm->arch.xen_hvm_config.msr)
3247                 return kvm_xen_write_hypercall_page(vcpu, data);
3248
3249         switch (msr) {
3250         case MSR_AMD64_NB_CFG:
3251         case MSR_IA32_UCODE_WRITE:
3252         case MSR_VM_HSAVE_PA:
3253         case MSR_AMD64_PATCH_LOADER:
3254         case MSR_AMD64_BU_CFG2:
3255         case MSR_AMD64_DC_CFG:
3256         case MSR_F15H_EX_CFG:
3257                 break;
3258
3259         case MSR_IA32_UCODE_REV:
3260                 if (msr_info->host_initiated)
3261                         vcpu->arch.microcode_version = data;
3262                 break;
3263         case MSR_IA32_ARCH_CAPABILITIES:
3264                 if (!msr_info->host_initiated)
3265                         return 1;
3266                 vcpu->arch.arch_capabilities = data;
3267                 break;
3268         case MSR_IA32_PERF_CAPABILITIES: {
3269                 struct kvm_msr_entry msr_ent = {.index = msr, .data = 0};
3270
3271                 if (!msr_info->host_initiated)
3272                         return 1;
3273                 if (guest_cpuid_has(vcpu, X86_FEATURE_PDCM) && kvm_get_msr_feature(&msr_ent))
3274                         return 1;
3275                 if (data & ~msr_ent.data)
3276                         return 1;
3277
3278                 vcpu->arch.perf_capabilities = data;
3279
3280                 return 0;
3281                 }
3282         case MSR_EFER:
3283                 return set_efer(vcpu, msr_info);
3284         case MSR_K7_HWCR:
3285                 data &= ~(u64)0x40;     /* ignore flush filter disable */
3286                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
3287                 data &= ~(u64)0x8;      /* ignore TLB cache disable */
3288
3289                 /* Handle McStatusWrEn */
3290                 if (data == BIT_ULL(18)) {
3291                         vcpu->arch.msr_hwcr = data;
3292                 } else if (data != 0) {
3293                         vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
3294                                     data);
3295                         return 1;
3296                 }
3297                 break;
3298         case MSR_FAM10H_MMIO_CONF_BASE:
3299                 if (data != 0) {
3300                         vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
3301                                     "0x%llx\n", data);
3302                         return 1;
3303                 }
3304                 break;
3305         case 0x200 ... 0x2ff:
3306                 return kvm_mtrr_set_msr(vcpu, msr, data);
3307         case MSR_IA32_APICBASE:
3308                 return kvm_set_apic_base(vcpu, msr_info);
3309         case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
3310                 return kvm_x2apic_msr_write(vcpu, msr, data);
3311         case MSR_IA32_TSC_DEADLINE:
3312                 kvm_set_lapic_tscdeadline_msr(vcpu, data);
3313                 break;
3314         case MSR_IA32_TSC_ADJUST:
3315                 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) {
3316                         if (!msr_info->host_initiated) {
3317                                 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr;
3318                                 adjust_tsc_offset_guest(vcpu, adj);
3319                         }
3320                         vcpu->arch.ia32_tsc_adjust_msr = data;
3321                 }
3322                 break;
3323         case MSR_IA32_MISC_ENABLE:
3324                 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT) &&
3325                     ((vcpu->arch.ia32_misc_enable_msr ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) {
3326                         if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3))
3327                                 return 1;
3328                         vcpu->arch.ia32_misc_enable_msr = data;
3329                         kvm_update_cpuid_runtime(vcpu);
3330                 } else {
3331                         vcpu->arch.ia32_misc_enable_msr = data;
3332                 }
3333                 break;
3334         case MSR_IA32_SMBASE:
3335                 if (!msr_info->host_initiated)
3336                         return 1;
3337                 vcpu->arch.smbase = data;
3338                 break;
3339         case MSR_IA32_POWER_CTL:
3340                 vcpu->arch.msr_ia32_power_ctl = data;
3341                 break;
3342         case MSR_IA32_TSC:
3343                 if (msr_info->host_initiated) {
3344                         kvm_synchronize_tsc(vcpu, data);
3345                 } else {
3346                         u64 adj = kvm_compute_l1_tsc_offset(vcpu, data) - vcpu->arch.l1_tsc_offset;
3347                         adjust_tsc_offset_guest(vcpu, adj);
3348                         vcpu->arch.ia32_tsc_adjust_msr += adj;
3349                 }
3350                 break;
3351         case MSR_IA32_XSS:
3352                 if (!msr_info->host_initiated &&
3353                     !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
3354                         return 1;
3355                 /*
3356                  * KVM supports exposing PT to the guest, but does not support
3357                  * IA32_XSS[bit 8]. Guests have to use RDMSR/WRMSR rather than
3358                  * XSAVES/XRSTORS to save/restore PT MSRs.
3359                  */
3360                 if (data & ~supported_xss)
3361                         return 1;
3362                 vcpu->arch.ia32_xss = data;
3363                 break;
3364         case MSR_SMI_COUNT:
3365                 if (!msr_info->host_initiated)
3366                         return 1;
3367                 vcpu->arch.smi_count = data;
3368                 break;
3369         case MSR_KVM_WALL_CLOCK_NEW:
3370                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3371                         return 1;
3372
3373                 vcpu->kvm->arch.wall_clock = data;
3374                 kvm_write_wall_clock(vcpu->kvm, data, 0);
3375                 break;
3376         case MSR_KVM_WALL_CLOCK:
3377                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3378                         return 1;
3379
3380                 vcpu->kvm->arch.wall_clock = data;
3381                 kvm_write_wall_clock(vcpu->kvm, data, 0);
3382                 break;
3383         case MSR_KVM_SYSTEM_TIME_NEW:
3384                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3385                         return 1;
3386
3387                 kvm_write_system_time(vcpu, data, false, msr_info->host_initiated);
3388                 break;
3389         case MSR_KVM_SYSTEM_TIME:
3390                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3391                         return 1;
3392
3393                 kvm_write_system_time(vcpu, data, true,  msr_info->host_initiated);
3394                 break;
3395         case MSR_KVM_ASYNC_PF_EN:
3396                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
3397                         return 1;
3398
3399                 if (kvm_pv_enable_async_pf(vcpu, data))
3400                         return 1;
3401                 break;
3402         case MSR_KVM_ASYNC_PF_INT:
3403                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
3404                         return 1;
3405
3406                 if (kvm_pv_enable_async_pf_int(vcpu, data))
3407                         return 1;
3408                 break;
3409         case MSR_KVM_ASYNC_PF_ACK:
3410                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
3411                         return 1;
3412                 if (data & 0x1) {
3413                         vcpu->arch.apf.pageready_pending = false;
3414                         kvm_check_async_pf_completion(vcpu);
3415                 }
3416                 break;
3417         case MSR_KVM_STEAL_TIME:
3418                 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME))
3419                         return 1;
3420
3421                 if (unlikely(!sched_info_on()))
3422                         return 1;
3423
3424                 if (data & KVM_STEAL_RESERVED_MASK)
3425                         return 1;
3426
3427                 vcpu->arch.st.msr_val = data;
3428
3429                 if (!(data & KVM_MSR_ENABLED))
3430                         break;
3431
3432                 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
3433
3434                 break;
3435         case MSR_KVM_PV_EOI_EN:
3436                 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI))
3437                         return 1;
3438
3439                 if (kvm_lapic_enable_pv_eoi(vcpu, data, sizeof(u8)))
3440                         return 1;
3441                 break;
3442
3443         case MSR_KVM_POLL_CONTROL:
3444                 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL))
3445                         return 1;
3446
3447                 /* only enable bit supported */
3448                 if (data & (-1ULL << 1))
3449                         return 1;
3450
3451                 vcpu->arch.msr_kvm_poll_control = data;
3452                 break;
3453
3454         case MSR_IA32_MCG_CTL:
3455         case MSR_IA32_MCG_STATUS:
3456         case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
3457                 return set_msr_mce(vcpu, msr_info);
3458
3459         case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
3460         case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
3461                 pr = true;
3462                 fallthrough;
3463         case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
3464         case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
3465                 if (kvm_pmu_is_valid_msr(vcpu, msr))
3466                         return kvm_pmu_set_msr(vcpu, msr_info);
3467
3468                 if (pr || data != 0)
3469                         vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
3470                                     "0x%x data 0x%llx\n", msr, data);
3471                 break;
3472         case MSR_K7_CLK_CTL:
3473                 /*
3474                  * Ignore all writes to this no longer documented MSR.
3475                  * Writes are only relevant for old K7 processors,
3476                  * all pre-dating SVM, but a recommended workaround from
3477                  * AMD for these chips. It is possible to specify the
3478                  * affected processor models on the command line, hence
3479                  * the need to ignore the workaround.
3480                  */
3481                 break;
3482         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
3483         case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
3484         case HV_X64_MSR_SYNDBG_OPTIONS:
3485         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
3486         case HV_X64_MSR_CRASH_CTL:
3487         case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
3488         case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
3489         case HV_X64_MSR_TSC_EMULATION_CONTROL:
3490         case HV_X64_MSR_TSC_EMULATION_STATUS:
3491                 return kvm_hv_set_msr_common(vcpu, msr, data,
3492                                              msr_info->host_initiated);
3493         case MSR_IA32_BBL_CR_CTL3:
3494                 /* Drop writes to this legacy MSR -- see rdmsr
3495                  * counterpart for further detail.
3496                  */
3497                 if (report_ignored_msrs)
3498                         vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n",
3499                                 msr, data);
3500                 break;
3501         case MSR_AMD64_OSVW_ID_LENGTH:
3502                 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3503                         return 1;
3504                 vcpu->arch.osvw.length = data;
3505                 break;
3506         case MSR_AMD64_OSVW_STATUS:
3507                 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3508                         return 1;
3509                 vcpu->arch.osvw.status = data;
3510                 break;
3511         case MSR_PLATFORM_INFO:
3512                 if (!msr_info->host_initiated ||
3513                     (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) &&
3514                      cpuid_fault_enabled(vcpu)))
3515                         return 1;
3516                 vcpu->arch.msr_platform_info = data;
3517                 break;
3518         case MSR_MISC_FEATURES_ENABLES:
3519                 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT ||
3520                     (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT &&
3521                      !supports_cpuid_fault(vcpu)))
3522                         return 1;
3523                 vcpu->arch.msr_misc_features_enables = data;
3524                 break;
3525         default:
3526                 if (kvm_pmu_is_valid_msr(vcpu, msr))
3527                         return kvm_pmu_set_msr(vcpu, msr_info);
3528                 return KVM_MSR_RET_INVALID;
3529         }
3530         return 0;
3531 }
3532 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
3533
3534 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
3535 {
3536         u64 data;
3537         u64 mcg_cap = vcpu->arch.mcg_cap;
3538         unsigned bank_num = mcg_cap & 0xff;
3539
3540         switch (msr) {
3541         case MSR_IA32_P5_MC_ADDR:
3542         case MSR_IA32_P5_MC_TYPE:
3543                 data = 0;
3544                 break;
3545         case MSR_IA32_MCG_CAP:
3546                 data = vcpu->arch.mcg_cap;
3547                 break;
3548         case MSR_IA32_MCG_CTL:
3549                 if (!(mcg_cap & MCG_CTL_P) && !host)
3550                         return 1;
3551                 data = vcpu->arch.mcg_ctl;
3552                 break;
3553         case MSR_IA32_MCG_STATUS:
3554                 data = vcpu->arch.mcg_status;
3555                 break;
3556         default:
3557                 if (msr >= MSR_IA32_MC0_CTL &&
3558                     msr < MSR_IA32_MCx_CTL(bank_num)) {
3559                         u32 offset = array_index_nospec(
3560                                 msr - MSR_IA32_MC0_CTL,
3561                                 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL);
3562
3563                         data = vcpu->arch.mce_banks[offset];
3564                         break;
3565                 }
3566                 return 1;
3567         }
3568         *pdata = data;
3569         return 0;
3570 }
3571
3572 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3573 {
3574         switch (msr_info->index) {
3575         case MSR_IA32_PLATFORM_ID:
3576         case MSR_IA32_EBL_CR_POWERON:
3577         case MSR_IA32_LASTBRANCHFROMIP:
3578         case MSR_IA32_LASTBRANCHTOIP:
3579         case MSR_IA32_LASTINTFROMIP:
3580         case MSR_IA32_LASTINTTOIP:
3581         case MSR_AMD64_SYSCFG:
3582         case MSR_K8_TSEG_ADDR:
3583         case MSR_K8_TSEG_MASK:
3584         case MSR_VM_HSAVE_PA:
3585         case MSR_K8_INT_PENDING_MSG:
3586         case MSR_AMD64_NB_CFG:
3587         case MSR_FAM10H_MMIO_CONF_BASE:
3588         case MSR_AMD64_BU_CFG2:
3589         case MSR_IA32_PERF_CTL:
3590         case MSR_AMD64_DC_CFG:
3591         case MSR_F15H_EX_CFG:
3592         /*
3593          * Intel Sandy Bridge CPUs must support the RAPL (running average power
3594          * limit) MSRs. Just return 0, as we do not want to expose the host
3595          * data here. Do not conditionalize this on CPUID, as KVM does not do
3596          * so for existing CPU-specific MSRs.
3597          */
3598         case MSR_RAPL_POWER_UNIT:
3599         case MSR_PP0_ENERGY_STATUS:     /* Power plane 0 (core) */
3600         case MSR_PP1_ENERGY_STATUS:     /* Power plane 1 (graphics uncore) */
3601         case MSR_PKG_ENERGY_STATUS:     /* Total package */
3602         case MSR_DRAM_ENERGY_STATUS:    /* DRAM controller */
3603                 msr_info->data = 0;
3604                 break;
3605         case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5:
3606                 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
3607                         return kvm_pmu_get_msr(vcpu, msr_info);
3608                 if (!msr_info->host_initiated)
3609                         return 1;
3610                 msr_info->data = 0;
3611                 break;
3612         case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
3613         case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
3614         case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
3615         case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
3616                 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
3617                         return kvm_pmu_get_msr(vcpu, msr_info);
3618                 msr_info->data = 0;
3619                 break;
3620         case MSR_IA32_UCODE_REV:
3621                 msr_info->data = vcpu->arch.microcode_version;
3622                 break;
3623         case MSR_IA32_ARCH_CAPABILITIES:
3624                 if (!msr_info->host_initiated &&
3625                     !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES))
3626                         return 1;
3627                 msr_info->data = vcpu->arch.arch_capabilities;
3628                 break;
3629         case MSR_IA32_PERF_CAPABILITIES:
3630                 if (!msr_info->host_initiated &&
3631                     !guest_cpuid_has(vcpu, X86_FEATURE_PDCM))
3632                         return 1;
3633                 msr_info->data = vcpu->arch.perf_capabilities;
3634                 break;
3635         case MSR_IA32_POWER_CTL:
3636                 msr_info->data = vcpu->arch.msr_ia32_power_ctl;
3637                 break;
3638         case MSR_IA32_TSC: {
3639                 /*
3640                  * Intel SDM states that MSR_IA32_TSC read adds the TSC offset
3641                  * even when not intercepted. AMD manual doesn't explicitly
3642                  * state this but appears to behave the same.
3643                  *
3644                  * On userspace reads and writes, however, we unconditionally
3645                  * return L1's TSC value to ensure backwards-compatible
3646                  * behavior for migration.
3647                  */
3648                 u64 offset, ratio;
3649
3650                 if (msr_info->host_initiated) {
3651                         offset = vcpu->arch.l1_tsc_offset;
3652                         ratio = vcpu->arch.l1_tsc_scaling_ratio;
3653                 } else {
3654                         offset = vcpu->arch.tsc_offset;
3655                         ratio = vcpu->arch.tsc_scaling_ratio;
3656                 }
3657
3658                 msr_info->data = kvm_scale_tsc(vcpu, rdtsc(), ratio) + offset;
3659                 break;
3660         }
3661         case MSR_MTRRcap:
3662         case 0x200 ... 0x2ff:
3663                 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data);
3664         case 0xcd: /* fsb frequency */
3665                 msr_info->data = 3;
3666                 break;
3667                 /*
3668                  * MSR_EBC_FREQUENCY_ID
3669                  * Conservative value valid for even the basic CPU models.
3670                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
3671                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
3672                  * and 266MHz for model 3, or 4. Set Core Clock
3673                  * Frequency to System Bus Frequency Ratio to 1 (bits
3674                  * 31:24) even though these are only valid for CPU
3675                  * models > 2, however guests may end up dividing or
3676                  * multiplying by zero otherwise.
3677                  */
3678         case MSR_EBC_FREQUENCY_ID:
3679                 msr_info->data = 1 << 24;
3680                 break;
3681         case MSR_IA32_APICBASE:
3682                 msr_info->data = kvm_get_apic_base(vcpu);
3683                 break;
3684         case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
3685                 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
3686         case MSR_IA32_TSC_DEADLINE:
3687                 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
3688                 break;
3689         case MSR_IA32_TSC_ADJUST:
3690                 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
3691                 break;
3692         case MSR_IA32_MISC_ENABLE:
3693                 msr_info->data = vcpu->arch.ia32_misc_enable_msr;
3694                 break;
3695         case MSR_IA32_SMBASE:
3696                 if (!msr_info->host_initiated)
3697                         return 1;
3698                 msr_info->data = vcpu->arch.smbase;
3699                 break;
3700         case MSR_SMI_COUNT:
3701                 msr_info->data = vcpu->arch.smi_count;
3702                 break;
3703         case MSR_IA32_PERF_STATUS:
3704                 /* TSC increment by tick */
3705                 msr_info->data = 1000ULL;
3706                 /* CPU multiplier */
3707                 msr_info->data |= (((uint64_t)4ULL) << 40);
3708                 break;
3709         case MSR_EFER:
3710                 msr_info->data = vcpu->arch.efer;
3711                 break;
3712         case MSR_KVM_WALL_CLOCK:
3713                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3714                         return 1;
3715
3716                 msr_info->data = vcpu->kvm->arch.wall_clock;
3717                 break;
3718         case MSR_KVM_WALL_CLOCK_NEW:
3719                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3720                         return 1;
3721
3722                 msr_info->data = vcpu->kvm->arch.wall_clock;
3723                 break;
3724         case MSR_KVM_SYSTEM_TIME:
3725                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3726                         return 1;
3727
3728                 msr_info->data = vcpu->arch.time;
3729                 break;
3730         case MSR_KVM_SYSTEM_TIME_NEW:
3731                 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3732                         return 1;
3733
3734                 msr_info->data = vcpu->arch.time;
3735                 break;
3736         case MSR_KVM_ASYNC_PF_EN:
3737                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
3738                         return 1;
3739
3740                 msr_info->data = vcpu->arch.apf.msr_en_val;
3741                 break;
3742         case MSR_KVM_ASYNC_PF_INT:
3743                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
3744                         return 1;
3745
3746                 msr_info->data = vcpu->arch.apf.msr_int_val;
3747                 break;
3748         case MSR_KVM_ASYNC_PF_ACK:
3749                 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
3750                         return 1;
3751
3752                 msr_info->data = 0;
3753                 break;
3754         case MSR_KVM_STEAL_TIME:
3755                 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME))
3756                         return 1;
3757
3758                 msr_info->data = vcpu->arch.st.msr_val;
3759                 break;
3760         case MSR_KVM_PV_EOI_EN:
3761                 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI))
3762                         return 1;
3763
3764                 msr_info->data = vcpu->arch.pv_eoi.msr_val;
3765                 break;
3766         case MSR_KVM_POLL_CONTROL:
3767                 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL))
3768                         return 1;
3769
3770                 msr_info->data = vcpu->arch.msr_kvm_poll_control;
3771                 break;
3772         case MSR_IA32_P5_MC_ADDR:
3773         case MSR_IA32_P5_MC_TYPE:
3774         case MSR_IA32_MCG_CAP:
3775         case MSR_IA32_MCG_CTL:
3776         case MSR_IA32_MCG_STATUS:
3777         case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
3778                 return get_msr_mce(vcpu, msr_info->index, &msr_info->data,
3779                                    msr_info->host_initiated);
3780         case MSR_IA32_XSS:
3781                 if (!msr_info->host_initiated &&
3782                     !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
3783                         return 1;
3784                 msr_info->data = vcpu->arch.ia32_xss;
3785                 break;
3786         case MSR_K7_CLK_CTL:
3787                 /*
3788                  * Provide expected ramp-up count for K7. All other
3789                  * are set to zero, indicating minimum divisors for
3790                  * every field.
3791                  *
3792                  * This prevents guest kernels on AMD host with CPU
3793                  * type 6, model 8 and higher from exploding due to
3794                  * the rdmsr failing.
3795                  */
3796                 msr_info->data = 0x20000000;
3797                 break;
3798         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
3799         case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
3800         case HV_X64_MSR_SYNDBG_OPTIONS:
3801         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
3802         case HV_X64_MSR_CRASH_CTL:
3803         case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
3804         case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
3805         case HV_X64_MSR_TSC_EMULATION_CONTROL:
3806         case HV_X64_MSR_TSC_EMULATION_STATUS:
3807                 return kvm_hv_get_msr_common(vcpu,
3808                                              msr_info->index, &msr_info->data,
3809                                              msr_info->host_initiated);
3810         case MSR_IA32_BBL_CR_CTL3:
3811                 /* This legacy MSR exists but isn't fully documented in current
3812                  * silicon.  It is however accessed by winxp in very narrow
3813                  * scenarios where it sets bit #19, itself documented as
3814                  * a "reserved" bit.  Best effort attempt to source coherent
3815                  * read data here should the balance of the register be
3816                  * interpreted by the guest:
3817                  *
3818                  * L2 cache control register 3: 64GB range, 256KB size,
3819                  * enabled, latency 0x1, configured
3820                  */
3821                 msr_info->data = 0xbe702111;
3822                 break;
3823         case MSR_AMD64_OSVW_ID_LENGTH:
3824                 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3825                         return 1;
3826                 msr_info->data = vcpu->arch.osvw.length;
3827                 break;
3828         case MSR_AMD64_OSVW_STATUS:
3829                 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3830                         return 1;
3831                 msr_info->data = vcpu->arch.osvw.status;
3832                 break;
3833         case MSR_PLATFORM_INFO:
3834                 if (!msr_info->host_initiated &&
3835                     !vcpu->kvm->arch.guest_can_read_msr_platform_info)
3836                         return 1;
3837                 msr_info->data = vcpu->arch.msr_platform_info;
3838                 break;
3839         case MSR_MISC_FEATURES_ENABLES:
3840                 msr_info->data = vcpu->arch.msr_misc_features_enables;
3841                 break;
3842         case MSR_K7_HWCR:
3843                 msr_info->data = vcpu->arch.msr_hwcr;
3844                 break;
3845         default:
3846                 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
3847                         return kvm_pmu_get_msr(vcpu, msr_info);
3848                 return KVM_MSR_RET_INVALID;
3849         }
3850         return 0;
3851 }
3852 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
3853
3854 /*
3855  * Read or write a bunch of msrs. All parameters are kernel addresses.
3856  *
3857  * @return number of msrs set successfully.
3858  */
3859 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
3860                     struct kvm_msr_entry *entries,
3861                     int (*do_msr)(struct kvm_vcpu *vcpu,
3862                                   unsigned index, u64 *data))
3863 {
3864         int i;
3865
3866         for (i = 0; i < msrs->nmsrs; ++i)
3867                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
3868                         break;
3869
3870         return i;
3871 }
3872
3873 /*
3874  * Read or write a bunch of msrs. Parameters are user addresses.
3875  *
3876  * @return number of msrs set successfully.
3877  */
3878 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
3879                   int (*do_msr)(struct kvm_vcpu *vcpu,
3880                                 unsigned index, u64 *data),
3881                   int writeback)
3882 {
3883         struct kvm_msrs msrs;
3884         struct kvm_msr_entry *entries;
3885         int r, n;
3886         unsigned size;
3887
3888         r = -EFAULT;
3889         if (copy_from_user(&msrs, user_msrs, sizeof(msrs)))
3890                 goto out;
3891
3892         r = -E2BIG;
3893         if (msrs.nmsrs >= MAX_IO_MSRS)
3894                 goto out;
3895
3896         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
3897         entries = memdup_user(user_msrs->entries, size);
3898         if (IS_ERR(entries)) {
3899                 r = PTR_ERR(entries);
3900                 goto out;
3901         }
3902
3903         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
3904         if (r < 0)
3905                 goto out_free;
3906
3907         r = -EFAULT;
3908         if (writeback && copy_to_user(user_msrs->entries, entries, size))
3909                 goto out_free;
3910
3911         r = n;
3912
3913 out_free:
3914         kfree(entries);
3915 out:
3916         return r;
3917 }
3918
3919 static inline bool kvm_can_mwait_in_guest(void)
3920 {
3921         return boot_cpu_has(X86_FEATURE_MWAIT) &&
3922                 !boot_cpu_has_bug(X86_BUG_MONITOR) &&
3923                 boot_cpu_has(X86_FEATURE_ARAT);
3924 }
3925
3926 static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
3927                                             struct kvm_cpuid2 __user *cpuid_arg)
3928 {
3929         struct kvm_cpuid2 cpuid;
3930         int r;
3931
3932         r = -EFAULT;
3933         if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
3934                 return r;
3935
3936         r = kvm_get_hv_cpuid(vcpu, &cpuid, cpuid_arg->entries);
3937         if (r)
3938                 return r;
3939
3940         r = -EFAULT;
3941         if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
3942                 return r;
3943
3944         return 0;
3945 }
3946
3947 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
3948 {
3949         int r = 0;
3950
3951         switch (ext) {
3952         case KVM_CAP_IRQCHIP:
3953         case KVM_CAP_HLT:
3954         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
3955         case KVM_CAP_SET_TSS_ADDR:
3956         case KVM_CAP_EXT_CPUID:
3957         case KVM_CAP_EXT_EMUL_CPUID:
3958         case KVM_CAP_CLOCKSOURCE:
3959         case KVM_CAP_PIT:
3960         case KVM_CAP_NOP_IO_DELAY:
3961         case KVM_CAP_MP_STATE:
3962         case KVM_CAP_SYNC_MMU:
3963         case KVM_CAP_USER_NMI:
3964         case KVM_CAP_REINJECT_CONTROL:
3965         case KVM_CAP_IRQ_INJECT_STATUS:
3966         case KVM_CAP_IOEVENTFD:
3967         case KVM_CAP_IOEVENTFD_NO_LENGTH:
3968         case KVM_CAP_PIT2:
3969         case KVM_CAP_PIT_STATE2:
3970         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
3971         case KVM_CAP_VCPU_EVENTS:
3972         case KVM_CAP_HYPERV:
3973         case KVM_CAP_HYPERV_VAPIC:
3974         case KVM_CAP_HYPERV_SPIN:
3975         case KVM_CAP_HYPERV_SYNIC:
3976         case KVM_CAP_HYPERV_SYNIC2:
3977         case KVM_CAP_HYPERV_VP_INDEX:
3978         case KVM_CAP_HYPERV_EVENTFD:
3979         case KVM_CAP_HYPERV_TLBFLUSH:
3980         case KVM_CAP_HYPERV_SEND_IPI:
3981         case KVM_CAP_HYPERV_CPUID:
3982         case KVM_CAP_HYPERV_ENFORCE_CPUID:
3983         case KVM_CAP_SYS_HYPERV_CPUID:
3984         case KVM_CAP_PCI_SEGMENT:
3985         case KVM_CAP_DEBUGREGS:
3986         case KVM_CAP_X86_ROBUST_SINGLESTEP:
3987         case KVM_CAP_XSAVE:
3988         case KVM_CAP_ASYNC_PF:
3989         case KVM_CAP_ASYNC_PF_INT:
3990         case KVM_CAP_GET_TSC_KHZ:
3991         case KVM_CAP_KVMCLOCK_CTRL:
3992         case KVM_CAP_READONLY_MEM:
3993         case KVM_CAP_HYPERV_TIME:
3994         case KVM_CAP_IOAPIC_POLARITY_IGNORED:
3995         case KVM_CAP_TSC_DEADLINE_TIMER:
3996         case KVM_CAP_DISABLE_QUIRKS:
3997         case KVM_CAP_SET_BOOT_CPU_ID:
3998         case KVM_CAP_SPLIT_IRQCHIP:
3999         case KVM_CAP_IMMEDIATE_EXIT:
4000         case KVM_CAP_PMU_EVENT_FILTER:
4001         case KVM_CAP_GET_MSR_FEATURES:
4002         case KVM_CAP_MSR_PLATFORM_INFO:
4003         case KVM_CAP_EXCEPTION_PAYLOAD:
4004         case KVM_CAP_SET_GUEST_DEBUG:
4005         case KVM_CAP_LAST_CPU:
4006         case KVM_CAP_X86_USER_SPACE_MSR:
4007         case KVM_CAP_X86_MSR_FILTER:
4008         case KVM_CAP_ENFORCE_PV_FEATURE_CPUID:
4009 #ifdef CONFIG_X86_SGX_KVM
4010         case KVM_CAP_SGX_ATTRIBUTE:
4011 #endif
4012         case KVM_CAP_VM_COPY_ENC_CONTEXT_FROM:
4013         case KVM_CAP_SREGS2:
4014         case KVM_CAP_EXIT_ON_EMULATION_FAILURE:
4015                 r = 1;
4016                 break;
4017         case KVM_CAP_EXIT_HYPERCALL:
4018                 r = KVM_EXIT_HYPERCALL_VALID_MASK;
4019                 break;
4020         case KVM_CAP_SET_GUEST_DEBUG2:
4021                 return KVM_GUESTDBG_VALID_MASK;
4022 #ifdef CONFIG_KVM_XEN
4023         case KVM_CAP_XEN_HVM:
4024                 r = KVM_XEN_HVM_CONFIG_HYPERCALL_MSR |
4025                     KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL |
4026                     KVM_XEN_HVM_CONFIG_SHARED_INFO;
4027                 if (sched_info_on())
4028                         r |= KVM_XEN_HVM_CONFIG_RUNSTATE;
4029                 break;
4030 #endif
4031         case KVM_CAP_SYNC_REGS:
4032                 r = KVM_SYNC_X86_VALID_FIELDS;
4033                 break;
4034         case KVM_CAP_ADJUST_CLOCK:
4035                 r = KVM_CLOCK_TSC_STABLE;
4036                 break;
4037         case KVM_CAP_X86_DISABLE_EXITS:
4038                 r |=  KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE |
4039                       KVM_X86_DISABLE_EXITS_CSTATE;
4040                 if(kvm_can_mwait_in_guest())
4041                         r |= KVM_X86_DISABLE_EXITS_MWAIT;
4042                 break;
4043         case KVM_CAP_X86_SMM:
4044                 /* SMBASE is usually relocated above 1M on modern chipsets,
4045                  * and SMM handlers might indeed rely on 4G segment limits,
4046                  * so do not report SMM to be available if real mode is
4047                  * emulated via vm86 mode.  Still, do not go to great lengths
4048                  * to avoid userspace's usage of the feature, because it is a
4049                  * fringe case that is not enabled except via specific settings
4050                  * of the module parameters.
4051                  */
4052                 r = static_call(kvm_x86_has_emulated_msr)(kvm, MSR_IA32_SMBASE);
4053                 break;
4054         case KVM_CAP_VAPIC:
4055                 r = !static_call(kvm_x86_cpu_has_accelerated_tpr)();
4056                 break;
4057         case KVM_CAP_NR_VCPUS:
4058                 r = KVM_SOFT_MAX_VCPUS;
4059                 break;
4060         case KVM_CAP_MAX_VCPUS:
4061                 r = KVM_MAX_VCPUS;
4062                 break;
4063         case KVM_CAP_MAX_VCPU_ID:
4064                 r = KVM_MAX_VCPU_ID;
4065                 break;
4066         case KVM_CAP_PV_MMU:    /* obsolete */
4067                 r = 0;
4068                 break;
4069         case KVM_CAP_MCE:
4070                 r = KVM_MAX_MCE_BANKS;
4071                 break;
4072         case KVM_CAP_XCRS:
4073                 r = boot_cpu_has(X86_FEATURE_XSAVE);
4074                 break;
4075         case KVM_CAP_TSC_CONTROL:
4076                 r = kvm_has_tsc_control;
4077                 break;
4078         case KVM_CAP_X2APIC_API:
4079                 r = KVM_X2APIC_API_VALID_FLAGS;
4080                 break;
4081         case KVM_CAP_NESTED_STATE:
4082                 r = kvm_x86_ops.nested_ops->get_state ?
4083                         kvm_x86_ops.nested_ops->get_state(NULL, NULL, 0) : 0;
4084                 break;
4085         case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
4086                 r = kvm_x86_ops.enable_direct_tlbflush != NULL;
4087                 break;
4088         case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
4089                 r = kvm_x86_ops.nested_ops->enable_evmcs != NULL;
4090                 break;
4091         case KVM_CAP_SMALLER_MAXPHYADDR:
4092                 r = (int) allow_smaller_maxphyaddr;
4093                 break;
4094         case KVM_CAP_STEAL_TIME:
4095                 r = sched_info_on();
4096                 break;
4097         case KVM_CAP_X86_BUS_LOCK_EXIT:
4098                 if (kvm_has_bus_lock_exit)
4099                         r = KVM_BUS_LOCK_DETECTION_OFF |
4100                             KVM_BUS_LOCK_DETECTION_EXIT;
4101                 else
4102                         r = 0;
4103                 break;
4104         default:
4105                 break;
4106         }
4107         return r;
4108
4109 }
4110
4111 long kvm_arch_dev_ioctl(struct file *filp,
4112                         unsigned int ioctl, unsigned long arg)
4113 {
4114         void __user *argp = (void __user *)arg;
4115         long r;
4116
4117         switch (ioctl) {
4118         case KVM_GET_MSR_INDEX_LIST: {
4119                 struct kvm_msr_list __user *user_msr_list = argp;
4120                 struct kvm_msr_list msr_list;
4121                 unsigned n;
4122
4123                 r = -EFAULT;
4124                 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
4125                         goto out;
4126                 n = msr_list.nmsrs;
4127                 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs;
4128                 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
4129                         goto out;
4130                 r = -E2BIG;
4131                 if (n < msr_list.nmsrs)
4132                         goto out;
4133                 r = -EFAULT;
4134                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
4135                                  num_msrs_to_save * sizeof(u32)))
4136                         goto out;
4137                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
4138                                  &emulated_msrs,
4139                                  num_emulated_msrs * sizeof(u32)))
4140                         goto out;
4141                 r = 0;
4142                 break;
4143         }
4144         case KVM_GET_SUPPORTED_CPUID:
4145         case KVM_GET_EMULATED_CPUID: {
4146                 struct kvm_cpuid2 __user *cpuid_arg = argp;
4147                 struct kvm_cpuid2 cpuid;
4148
4149                 r = -EFAULT;
4150                 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
4151                         goto out;
4152
4153                 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries,
4154                                             ioctl);
4155                 if (r)
4156                         goto out;
4157
4158                 r = -EFAULT;
4159                 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
4160                         goto out;
4161                 r = 0;
4162                 break;
4163         }
4164         case KVM_X86_GET_MCE_CAP_SUPPORTED:
4165                 r = -EFAULT;
4166                 if (copy_to_user(argp, &kvm_mce_cap_supported,
4167                                  sizeof(kvm_mce_cap_supported)))
4168                         goto out;
4169                 r = 0;
4170                 break;
4171         case KVM_GET_MSR_FEATURE_INDEX_LIST: {
4172                 struct kvm_msr_list __user *user_msr_list = argp;
4173                 struct kvm_msr_list msr_list;
4174                 unsigned int n;
4175
4176                 r = -EFAULT;
4177                 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
4178                         goto out;
4179                 n = msr_list.nmsrs;
4180                 msr_list.nmsrs = num_msr_based_features;
4181                 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
4182                         goto out;
4183                 r = -E2BIG;
4184                 if (n < msr_list.nmsrs)
4185                         goto out;
4186                 r = -EFAULT;
4187                 if (copy_to_user(user_msr_list->indices, &msr_based_features,
4188                                  num_msr_based_features * sizeof(u32)))
4189                         goto out;
4190                 r = 0;
4191                 break;
4192         }
4193         case KVM_GET_MSRS:
4194                 r = msr_io(NULL, argp, do_get_msr_feature, 1);
4195                 break;
4196         case KVM_GET_SUPPORTED_HV_CPUID:
4197                 r = kvm_ioctl_get_supported_hv_cpuid(NULL, argp);
4198                 break;
4199         default:
4200                 r = -EINVAL;
4201                 break;
4202         }
4203 out:
4204         return r;
4205 }
4206
4207 static void wbinvd_ipi(void *garbage)
4208 {
4209         wbinvd();
4210 }
4211
4212 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
4213 {
4214         return kvm_arch_has_noncoherent_dma(vcpu->kvm);
4215 }
4216
4217 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
4218 {
4219         /* Address WBINVD may be executed by guest */
4220         if (need_emulate_wbinvd(vcpu)) {
4221                 if (static_call(kvm_x86_has_wbinvd_exit)())
4222                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4223                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
4224                         smp_call_function_single(vcpu->cpu,
4225                                         wbinvd_ipi, NULL, 1);
4226         }
4227
4228         static_call(kvm_x86_vcpu_load)(vcpu, cpu);
4229
4230         /* Save host pkru register if supported */
4231         vcpu->arch.host_pkru = read_pkru();
4232
4233         /* Apply any externally detected TSC adjustments (due to suspend) */
4234         if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
4235                 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
4236                 vcpu->arch.tsc_offset_adjustment = 0;
4237                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4238         }
4239
4240         if (unlikely(vcpu->cpu != cpu) || kvm_check_tsc_unstable()) {
4241                 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
4242                                 rdtsc() - vcpu->arch.last_host_tsc;
4243                 if (tsc_delta < 0)
4244                         mark_tsc_unstable("KVM discovered backwards TSC");
4245
4246                 if (kvm_check_tsc_unstable()) {
4247                         u64 offset = kvm_compute_l1_tsc_offset(vcpu,
4248                                                 vcpu->arch.last_guest_tsc);
4249                         kvm_vcpu_write_tsc_offset(vcpu, offset);
4250                         vcpu->arch.tsc_catchup = 1;
4251                 }
4252
4253                 if (kvm_lapic_hv_timer_in_use(vcpu))
4254                         kvm_lapic_restart_hv_timer(vcpu);
4255
4256                 /*
4257                  * On a host with synchronized TSC, there is no need to update
4258                  * kvmclock on vcpu->cpu migration
4259                  */
4260                 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1)
4261                         kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
4262                 if (vcpu->cpu != cpu)
4263                         kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu);
4264                 vcpu->cpu = cpu;
4265         }
4266
4267         kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
4268 }
4269
4270 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
4271 {
4272         struct kvm_host_map map;
4273         struct kvm_steal_time *st;
4274
4275         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
4276                 return;
4277
4278         if (vcpu->arch.st.preempted)
4279                 return;
4280
4281         if (kvm_map_gfn(vcpu, vcpu->arch.st.msr_val >> PAGE_SHIFT, &map,
4282                         &vcpu->arch.st.cache, true))
4283                 return;
4284
4285         st = map.hva +
4286                 offset_in_page(vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS);
4287
4288         st->preempted = vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
4289
4290         kvm_unmap_gfn(vcpu, &map, &vcpu->arch.st.cache, true, true);
4291 }
4292
4293 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
4294 {
4295         int idx;
4296
4297         if (vcpu->preempted && !vcpu->arch.guest_state_protected)
4298                 vcpu->arch.preempted_in_kernel = !static_call(kvm_x86_get_cpl)(vcpu);
4299
4300         /*
4301          * Take the srcu lock as memslots will be accessed to check the gfn
4302          * cache generation against the memslots generation.
4303          */
4304         idx = srcu_read_lock(&vcpu->kvm->srcu);
4305         if (kvm_xen_msr_enabled(vcpu->kvm))
4306                 kvm_xen_runstate_set_preempted(vcpu);
4307         else
4308                 kvm_steal_time_set_preempted(vcpu);
4309         srcu_read_unlock(&vcpu->kvm->srcu, idx);
4310
4311         static_call(kvm_x86_vcpu_put)(vcpu);
4312         vcpu->arch.last_host_tsc = rdtsc();
4313         /*
4314          * If userspace has set any breakpoints or watchpoints, dr6 is restored
4315          * on every vmexit, but if not, we might have a stale dr6 from the
4316          * guest. do_debug expects dr6 to be cleared after it runs, do the same.
4317          */
4318         set_debugreg(0, 6);
4319 }
4320
4321 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
4322                                     struct kvm_lapic_state *s)
4323 {
4324         if (vcpu->arch.apicv_active)
4325                 static_call(kvm_x86_sync_pir_to_irr)(vcpu);
4326
4327         return kvm_apic_get_state(vcpu, s);
4328 }
4329
4330 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
4331                                     struct kvm_lapic_state *s)
4332 {
4333         int r;
4334
4335         r = kvm_apic_set_state(vcpu, s);
4336         if (r)
4337                 return r;
4338         update_cr8_intercept(vcpu);
4339
4340         return 0;
4341 }
4342
4343 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu)
4344 {
4345         /*
4346          * We can accept userspace's request for interrupt injection
4347          * as long as we have a place to store the interrupt number.
4348          * The actual injection will happen when the CPU is able to
4349          * deliver the interrupt.
4350          */
4351         if (kvm_cpu_has_extint(vcpu))
4352                 return false;
4353
4354         /* Acknowledging ExtINT does not happen if LINT0 is masked.  */
4355         return (!lapic_in_kernel(vcpu) ||
4356                 kvm_apic_accept_pic_intr(vcpu));
4357 }
4358
4359 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu)
4360 {
4361         return kvm_arch_interrupt_allowed(vcpu) &&
4362                 kvm_cpu_accept_dm_intr(vcpu);
4363 }
4364
4365 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
4366                                     struct kvm_interrupt *irq)
4367 {
4368         if (irq->irq >= KVM_NR_INTERRUPTS)
4369                 return -EINVAL;
4370
4371         if (!irqchip_in_kernel(vcpu->kvm)) {
4372                 kvm_queue_interrupt(vcpu, irq->irq, false);
4373                 kvm_make_request(KVM_REQ_EVENT, vcpu);
4374                 return 0;
4375         }
4376
4377         /*
4378          * With in-kernel LAPIC, we only use this to inject EXTINT, so
4379          * fail for in-kernel 8259.
4380          */
4381         if (pic_in_kernel(vcpu->kvm))
4382                 return -ENXIO;
4383
4384         if (vcpu->arch.pending_external_vector != -1)
4385                 return -EEXIST;
4386
4387         vcpu->arch.pending_external_vector = irq->irq;
4388         kvm_make_request(KVM_REQ_EVENT, vcpu);
4389         return 0;
4390 }
4391
4392 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
4393 {
4394         kvm_inject_nmi(vcpu);
4395
4396         return 0;
4397 }
4398
4399 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu)
4400 {
4401         kvm_make_request(KVM_REQ_SMI, vcpu);
4402
4403         return 0;
4404 }
4405
4406 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
4407                                            struct kvm_tpr_access_ctl *tac)
4408 {
4409         if (tac->flags)
4410                 return -EINVAL;
4411         vcpu->arch.tpr_access_reporting = !!tac->enabled;
4412         return 0;
4413 }
4414
4415 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
4416                                         u64 mcg_cap)
4417 {
4418         int r;
4419         unsigned bank_num = mcg_cap & 0xff, bank;
4420
4421         r = -EINVAL;
4422         if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
4423                 goto out;
4424         if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
4425                 goto out;
4426         r = 0;
4427         vcpu->arch.mcg_cap = mcg_cap;
4428         /* Init IA32_MCG_CTL to all 1s */
4429         if (mcg_cap & MCG_CTL_P)
4430                 vcpu->arch.mcg_ctl = ~(u64)0;
4431         /* Init IA32_MCi_CTL to all 1s */
4432         for (bank = 0; bank < bank_num; bank++)
4433                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
4434
4435         static_call(kvm_x86_setup_mce)(vcpu);
4436 out:
4437         return r;
4438 }
4439
4440 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
4441                                       struct kvm_x86_mce *mce)
4442 {
4443         u64 mcg_cap = vcpu->arch.mcg_cap;
4444         unsigned bank_num = mcg_cap & 0xff;
4445         u64 *banks = vcpu->arch.mce_banks;
4446
4447         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
4448                 return -EINVAL;
4449         /*
4450          * if IA32_MCG_CTL is not all 1s, the uncorrected error
4451          * reporting is disabled
4452          */
4453         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
4454             vcpu->arch.mcg_ctl != ~(u64)0)
4455                 return 0;
4456         banks += 4 * mce->bank;
4457         /*
4458          * if IA32_MCi_CTL is not all 1s, the uncorrected error
4459          * reporting is disabled for the bank
4460          */
4461         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
4462                 return 0;
4463         if (mce->status & MCI_STATUS_UC) {
4464                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
4465                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
4466                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4467                         return 0;
4468                 }
4469                 if (banks[1] & MCI_STATUS_VAL)
4470                         mce->status |= MCI_STATUS_OVER;
4471                 banks[2] = mce->addr;
4472                 banks[3] = mce->misc;
4473                 vcpu->arch.mcg_status = mce->mcg_status;
4474                 banks[1] = mce->status;
4475                 kvm_queue_exception(vcpu, MC_VECTOR);
4476         } else if (!(banks[1] & MCI_STATUS_VAL)
4477                    || !(banks[1] & MCI_STATUS_UC)) {
4478                 if (banks[1] & MCI_STATUS_VAL)
4479                         mce->status |= MCI_STATUS_OVER;
4480                 banks[2] = mce->addr;
4481                 banks[3] = mce->misc;
4482                 banks[1] = mce->status;
4483         } else
4484                 banks[1] |= MCI_STATUS_OVER;
4485         return 0;
4486 }
4487
4488 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
4489                                                struct kvm_vcpu_events *events)
4490 {
4491         process_nmi(vcpu);
4492
4493         if (kvm_check_request(KVM_REQ_SMI, vcpu))
4494                 process_smi(vcpu);
4495
4496         /*
4497          * In guest mode, payload delivery should be deferred,
4498          * so that the L1 hypervisor can intercept #PF before
4499          * CR2 is modified (or intercept #DB before DR6 is
4500          * modified under nVMX). Unless the per-VM capability,
4501          * KVM_CAP_EXCEPTION_PAYLOAD, is set, we may not defer the delivery of
4502          * an exception payload and handle after a KVM_GET_VCPU_EVENTS. Since we
4503          * opportunistically defer the exception payload, deliver it if the
4504          * capability hasn't been requested before processing a
4505          * KVM_GET_VCPU_EVENTS.
4506          */
4507         if (!vcpu->kvm->arch.exception_payload_enabled &&
4508             vcpu->arch.exception.pending && vcpu->arch.exception.has_payload)
4509                 kvm_deliver_exception_payload(vcpu);
4510
4511         /*
4512          * The API doesn't provide the instruction length for software
4513          * exceptions, so don't report them. As long as the guest RIP
4514          * isn't advanced, we should expect to encounter the exception
4515          * again.
4516          */
4517         if (kvm_exception_is_soft(vcpu->arch.exception.nr)) {
4518                 events->exception.injected = 0;
4519                 events->exception.pending = 0;
4520         } else {
4521                 events->exception.injected = vcpu->arch.exception.injected;
4522                 events->exception.pending = vcpu->arch.exception.pending;
4523                 /*
4524                  * For ABI compatibility, deliberately conflate
4525                  * pending and injected exceptions when
4526                  * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled.
4527                  */
4528                 if (!vcpu->kvm->arch.exception_payload_enabled)
4529                         events->exception.injected |=
4530                                 vcpu->arch.exception.pending;
4531         }
4532         events->exception.nr = vcpu->arch.exception.nr;
4533         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
4534         events->exception.error_code = vcpu->arch.exception.error_code;
4535         events->exception_has_payload = vcpu->arch.exception.has_payload;
4536         events->exception_payload = vcpu->arch.exception.payload;
4537
4538         events->interrupt.injected =
4539                 vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft;
4540         events->interrupt.nr = vcpu->arch.interrupt.nr;
4541         events->interrupt.soft = 0;
4542         events->interrupt.shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
4543
4544         events->nmi.injected = vcpu->arch.nmi_injected;
4545         events->nmi.pending = vcpu->arch.nmi_pending != 0;
4546         events->nmi.masked = static_call(kvm_x86_get_nmi_mask)(vcpu);
4547         events->nmi.pad = 0;
4548
4549         events->sipi_vector = 0; /* never valid when reporting to user space */
4550
4551         events->smi.smm = is_smm(vcpu);
4552         events->smi.pending = vcpu->arch.smi_pending;
4553         events->smi.smm_inside_nmi =
4554                 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK);
4555         events->smi.latched_init = kvm_lapic_latched_init(vcpu);
4556
4557         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
4558                          | KVM_VCPUEVENT_VALID_SHADOW
4559                          | KVM_VCPUEVENT_VALID_SMM);
4560         if (vcpu->kvm->arch.exception_payload_enabled)
4561                 events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD;
4562
4563         memset(&events->reserved, 0, sizeof(events->reserved));
4564 }
4565
4566 static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm);
4567
4568 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
4569                                               struct kvm_vcpu_events *events)
4570 {
4571         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
4572                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
4573                               | KVM_VCPUEVENT_VALID_SHADOW
4574                               | KVM_VCPUEVENT_VALID_SMM
4575                               | KVM_VCPUEVENT_VALID_PAYLOAD))
4576                 return -EINVAL;
4577
4578         if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) {
4579                 if (!vcpu->kvm->arch.exception_payload_enabled)
4580                         return -EINVAL;
4581                 if (events->exception.pending)
4582                         events->exception.injected = 0;
4583                 else
4584                         events->exception_has_payload = 0;
4585         } else {
4586                 events->exception.pending = 0;
4587                 events->exception_has_payload = 0;
4588         }
4589
4590         if ((events->exception.injected || events->exception.pending) &&
4591             (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR))
4592                 return -EINVAL;
4593
4594         /* INITs are latched while in SMM */
4595         if (events->flags & KVM_VCPUEVENT_VALID_SMM &&
4596             (events->smi.smm || events->smi.pending) &&
4597             vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED)
4598                 return -EINVAL;
4599
4600         process_nmi(vcpu);
4601         vcpu->arch.exception.injected = events->exception.injected;
4602         vcpu->arch.exception.pending = events->exception.pending;
4603         vcpu->arch.exception.nr = events->exception.nr;
4604         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
4605         vcpu->arch.exception.error_code = events->exception.error_code;
4606         vcpu->arch.exception.has_payload = events->exception_has_payload;
4607         vcpu->arch.exception.payload = events->exception_payload;
4608
4609         vcpu->arch.interrupt.injected = events->interrupt.injected;
4610         vcpu->arch.interrupt.nr = events->interrupt.nr;
4611         vcpu->arch.interrupt.soft = events->interrupt.soft;
4612         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
4613                 static_call(kvm_x86_set_interrupt_shadow)(vcpu,
4614                                                 events->interrupt.shadow);
4615
4616         vcpu->arch.nmi_injected = events->nmi.injected;
4617         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
4618                 vcpu->arch.nmi_pending = events->nmi.pending;
4619         static_call(kvm_x86_set_nmi_mask)(vcpu, events->nmi.masked);
4620
4621         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR &&
4622             lapic_in_kernel(vcpu))
4623                 vcpu->arch.apic->sipi_vector = events->sipi_vector;
4624
4625         if (events->flags & KVM_VCPUEVENT_VALID_SMM) {
4626                 if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm)
4627                         kvm_smm_changed(vcpu, events->smi.smm);
4628
4629                 vcpu->arch.smi_pending = events->smi.pending;
4630
4631                 if (events->smi.smm) {
4632                         if (events->smi.smm_inside_nmi)
4633                                 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
4634                         else
4635                                 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK;
4636                 }
4637
4638                 if (lapic_in_kernel(vcpu)) {
4639                         if (events->smi.latched_init)
4640                                 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
4641                         else
4642                                 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
4643                 }
4644         }
4645
4646         kvm_make_request(KVM_REQ_EVENT, vcpu);
4647
4648         return 0;
4649 }
4650
4651 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
4652                                              struct kvm_debugregs *dbgregs)
4653 {
4654         unsigned long val;
4655
4656         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
4657         kvm_get_dr(vcpu, 6, &val);
4658         dbgregs->dr6 = val;
4659         dbgregs->dr7 = vcpu->arch.dr7;
4660         dbgregs->flags = 0;
4661         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
4662 }
4663
4664 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
4665                                             struct kvm_debugregs *dbgregs)
4666 {
4667         if (dbgregs->flags)
4668                 return -EINVAL;
4669
4670         if (!kvm_dr6_valid(dbgregs->dr6))
4671                 return -EINVAL;
4672         if (!kvm_dr7_valid(dbgregs->dr7))
4673                 return -EINVAL;
4674
4675         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
4676         kvm_update_dr0123(vcpu);
4677         vcpu->arch.dr6 = dbgregs->dr6;
4678         vcpu->arch.dr7 = dbgregs->dr7;
4679         kvm_update_dr7(vcpu);
4680
4681         return 0;
4682 }
4683
4684 #define XSTATE_COMPACTION_ENABLED (1ULL << 63)
4685
4686 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
4687 {
4688         struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave;
4689         u64 xstate_bv = xsave->header.xfeatures;
4690         u64 valid;
4691
4692         /*
4693          * Copy legacy XSAVE area, to avoid complications with CPUID
4694          * leaves 0 and 1 in the loop below.
4695          */
4696         memcpy(dest, xsave, XSAVE_HDR_OFFSET);
4697
4698         /* Set XSTATE_BV */
4699         xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE;
4700         *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv;
4701
4702         /*
4703          * Copy each region from the possibly compacted offset to the
4704          * non-compacted offset.
4705          */
4706         valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
4707         while (valid) {
4708                 u32 size, offset, ecx, edx;
4709                 u64 xfeature_mask = valid & -valid;
4710                 int xfeature_nr = fls64(xfeature_mask) - 1;
4711                 void *src;
4712
4713                 cpuid_count(XSTATE_CPUID, xfeature_nr,
4714                             &size, &offset, &ecx, &edx);
4715
4716                 if (xfeature_nr == XFEATURE_PKRU) {
4717                         memcpy(dest + offset, &vcpu->arch.pkru,
4718                                sizeof(vcpu->arch.pkru));
4719                 } else {
4720                         src = get_xsave_addr(xsave, xfeature_nr);
4721                         if (src)
4722                                 memcpy(dest + offset, src, size);
4723                 }
4724
4725                 valid -= xfeature_mask;
4726         }
4727 }
4728
4729 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src)
4730 {
4731         struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave;
4732         u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET);
4733         u64 valid;
4734
4735         /*
4736          * Copy legacy XSAVE area, to avoid complications with CPUID
4737          * leaves 0 and 1 in the loop below.
4738          */
4739         memcpy(xsave, src, XSAVE_HDR_OFFSET);
4740
4741         /* Set XSTATE_BV and possibly XCOMP_BV.  */
4742         xsave->header.xfeatures = xstate_bv;
4743         if (boot_cpu_has(X86_FEATURE_XSAVES))
4744                 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED;
4745
4746         /*
4747          * Copy each region from the non-compacted offset to the
4748          * possibly compacted offset.
4749          */
4750         valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
4751         while (valid) {
4752                 u32 size, offset, ecx, edx;
4753                 u64 xfeature_mask = valid & -valid;
4754                 int xfeature_nr = fls64(xfeature_mask) - 1;
4755
4756                 cpuid_count(XSTATE_CPUID, xfeature_nr,
4757                             &size, &offset, &ecx, &edx);
4758
4759                 if (xfeature_nr == XFEATURE_PKRU) {
4760                         memcpy(&vcpu->arch.pkru, src + offset,
4761                                sizeof(vcpu->arch.pkru));
4762                 } else {
4763                         void *dest = get_xsave_addr(xsave, xfeature_nr);
4764
4765                         if (dest)
4766                                 memcpy(dest, src + offset, size);
4767                 }
4768
4769                 valid -= xfeature_mask;
4770         }
4771 }
4772
4773 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
4774                                          struct kvm_xsave *guest_xsave)
4775 {
4776         if (!vcpu->arch.guest_fpu)
4777                 return;
4778
4779         if (boot_cpu_has(X86_FEATURE_XSAVE)) {
4780                 memset(guest_xsave, 0, sizeof(struct kvm_xsave));
4781                 fill_xsave((u8 *) guest_xsave->region, vcpu);
4782         } else {
4783                 memcpy(guest_xsave->region,
4784                         &vcpu->arch.guest_fpu->state.fxsave,
4785                         sizeof(struct fxregs_state));
4786                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
4787                         XFEATURE_MASK_FPSSE;
4788         }
4789 }
4790
4791 #define XSAVE_MXCSR_OFFSET 24
4792
4793 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
4794                                         struct kvm_xsave *guest_xsave)
4795 {
4796         u64 xstate_bv;
4797         u32 mxcsr;
4798
4799         if (!vcpu->arch.guest_fpu)
4800                 return 0;
4801
4802         xstate_bv = *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
4803         mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)];
4804
4805         if (boot_cpu_has(X86_FEATURE_XSAVE)) {
4806                 /*
4807                  * Here we allow setting states that are not present in
4808                  * CPUID leaf 0xD, index 0, EDX:EAX.  This is for compatibility
4809                  * with old userspace.
4810                  */
4811                 if (xstate_bv & ~supported_xcr0 || mxcsr & ~mxcsr_feature_mask)
4812                         return -EINVAL;
4813                 load_xsave(vcpu, (u8 *)guest_xsave->region);
4814         } else {
4815                 if (xstate_bv & ~XFEATURE_MASK_FPSSE ||
4816                         mxcsr & ~mxcsr_feature_mask)
4817                         return -EINVAL;
4818                 memcpy(&vcpu->arch.guest_fpu->state.fxsave,
4819                         guest_xsave->region, sizeof(struct fxregs_state));
4820         }
4821         return 0;
4822 }
4823
4824 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
4825                                         struct kvm_xcrs *guest_xcrs)
4826 {
4827         if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
4828                 guest_xcrs->nr_xcrs = 0;
4829                 return;
4830         }
4831
4832         guest_xcrs->nr_xcrs = 1;
4833         guest_xcrs->flags = 0;
4834         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
4835         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
4836 }
4837
4838 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
4839                                        struct kvm_xcrs *guest_xcrs)
4840 {
4841         int i, r = 0;
4842
4843         if (!boot_cpu_has(X86_FEATURE_XSAVE))
4844                 return -EINVAL;
4845
4846         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
4847                 return -EINVAL;
4848
4849         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
4850                 /* Only support XCR0 currently */
4851                 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) {
4852                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
4853                                 guest_xcrs->xcrs[i].value);
4854                         break;
4855                 }
4856         if (r)
4857                 r = -EINVAL;
4858         return r;
4859 }
4860
4861 /*
4862  * kvm_set_guest_paused() indicates to the guest kernel that it has been
4863  * stopped by the hypervisor.  This function will be called from the host only.
4864  * EINVAL is returned when the host attempts to set the flag for a guest that
4865  * does not support pv clocks.
4866  */
4867 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
4868 {
4869         if (!vcpu->arch.pv_time_enabled)
4870                 return -EINVAL;
4871         vcpu->arch.pvclock_set_guest_stopped_request = true;
4872         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4873         return 0;
4874 }
4875
4876 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
4877                                      struct kvm_enable_cap *cap)
4878 {
4879         int r;
4880         uint16_t vmcs_version;
4881         void __user *user_ptr;
4882
4883         if (cap->flags)
4884                 return -EINVAL;
4885
4886         switch (cap->cap) {
4887         case KVM_CAP_HYPERV_SYNIC2:
4888                 if (cap->args[0])
4889                         return -EINVAL;
4890                 fallthrough;
4891
4892         case KVM_CAP_HYPERV_SYNIC:
4893                 if (!irqchip_in_kernel(vcpu->kvm))
4894                         return -EINVAL;
4895                 return kvm_hv_activate_synic(vcpu, cap->cap ==
4896                                              KVM_CAP_HYPERV_SYNIC2);
4897         case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
4898                 if (!kvm_x86_ops.nested_ops->enable_evmcs)
4899                         return -ENOTTY;
4900                 r = kvm_x86_ops.nested_ops->enable_evmcs(vcpu, &vmcs_version);
4901                 if (!r) {
4902                         user_ptr = (void __user *)(uintptr_t)cap->args[0];
4903                         if (copy_to_user(user_ptr, &vmcs_version,
4904                                          sizeof(vmcs_version)))
4905                                 r = -EFAULT;
4906                 }
4907                 return r;
4908         case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
4909                 if (!kvm_x86_ops.enable_direct_tlbflush)
4910                         return -ENOTTY;
4911
4912                 return static_call(kvm_x86_enable_direct_tlbflush)(vcpu);
4913
4914         case KVM_CAP_HYPERV_ENFORCE_CPUID:
4915                 return kvm_hv_set_enforce_cpuid(vcpu, cap->args[0]);
4916
4917         case KVM_CAP_ENFORCE_PV_FEATURE_CPUID:
4918                 vcpu->arch.pv_cpuid.enforce = cap->args[0];
4919                 if (vcpu->arch.pv_cpuid.enforce)
4920                         kvm_update_pv_runtime(vcpu);
4921
4922                 return 0;
4923         default:
4924                 return -EINVAL;
4925         }
4926 }
4927
4928 long kvm_arch_vcpu_ioctl(struct file *filp,
4929                          unsigned int ioctl, unsigned long arg)
4930 {
4931         struct kvm_vcpu *vcpu = filp->private_data;
4932         void __user *argp = (void __user *)arg;
4933         int r;
4934         union {
4935                 struct kvm_sregs2 *sregs2;
4936                 struct kvm_lapic_state *lapic;
4937                 struct kvm_xsave *xsave;
4938                 struct kvm_xcrs *xcrs;
4939                 void *buffer;
4940         } u;
4941
4942         vcpu_load(vcpu);
4943
4944         u.buffer = NULL;
4945         switch (ioctl) {
4946         case KVM_GET_LAPIC: {
4947                 r = -EINVAL;
4948                 if (!lapic_in_kernel(vcpu))
4949                         goto out;
4950                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state),
4951                                 GFP_KERNEL_ACCOUNT);
4952
4953                 r = -ENOMEM;
4954                 if (!u.lapic)
4955                         goto out;
4956                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
4957                 if (r)
4958                         goto out;
4959                 r = -EFAULT;
4960                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
4961                         goto out;
4962                 r = 0;
4963                 break;
4964         }
4965         case KVM_SET_LAPIC: {
4966                 r = -EINVAL;
4967                 if (!lapic_in_kernel(vcpu))
4968                         goto out;
4969                 u.lapic = memdup_user(argp, sizeof(*u.lapic));
4970                 if (IS_ERR(u.lapic)) {
4971                         r = PTR_ERR(u.lapic);
4972                         goto out_nofree;
4973                 }
4974
4975                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
4976                 break;
4977         }
4978         case KVM_INTERRUPT: {
4979                 struct kvm_interrupt irq;
4980
4981                 r = -EFAULT;
4982                 if (copy_from_user(&irq, argp, sizeof(irq)))
4983                         goto out;
4984                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
4985                 break;
4986         }
4987         case KVM_NMI: {
4988                 r = kvm_vcpu_ioctl_nmi(vcpu);
4989                 break;
4990         }
4991         case KVM_SMI: {
4992                 r = kvm_vcpu_ioctl_smi(vcpu);
4993                 break;
4994         }
4995         case KVM_SET_CPUID: {
4996                 struct kvm_cpuid __user *cpuid_arg = argp;
4997                 struct kvm_cpuid cpuid;
4998
4999                 r = -EFAULT;
5000                 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5001                         goto out;
5002                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
5003                 break;
5004         }
5005         case KVM_SET_CPUID2: {
5006                 struct kvm_cpuid2 __user *cpuid_arg = argp;
5007                 struct kvm_cpuid2 cpuid;
5008
5009                 r = -EFAULT;
5010                 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5011                         goto out;
5012                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
5013                                               cpuid_arg->entries);
5014                 break;
5015         }
5016         case KVM_GET_CPUID2: {
5017                 struct kvm_cpuid2 __user *cpuid_arg = argp;
5018                 struct kvm_cpuid2 cpuid;
5019
5020                 r = -EFAULT;
5021                 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5022                         goto out;
5023                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
5024                                               cpuid_arg->entries);
5025                 if (r)
5026                         goto out;
5027                 r = -EFAULT;
5028                 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
5029                         goto out;
5030                 r = 0;
5031                 break;
5032         }
5033         case KVM_GET_MSRS: {
5034                 int idx = srcu_read_lock(&vcpu->kvm->srcu);
5035                 r = msr_io(vcpu, argp, do_get_msr, 1);
5036                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5037                 break;
5038         }
5039         case KVM_SET_MSRS: {
5040                 int idx = srcu_read_lock(&vcpu->kvm->srcu);
5041                 r = msr_io(vcpu, argp, do_set_msr, 0);
5042                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5043                 break;
5044         }
5045         case KVM_TPR_ACCESS_REPORTING: {
5046                 struct kvm_tpr_access_ctl tac;
5047
5048                 r = -EFAULT;
5049                 if (copy_from_user(&tac, argp, sizeof(tac)))
5050                         goto out;
5051                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
5052                 if (r)
5053                         goto out;
5054                 r = -EFAULT;
5055                 if (copy_to_user(argp, &tac, sizeof(tac)))
5056                         goto out;
5057                 r = 0;
5058                 break;
5059         };
5060         case KVM_SET_VAPIC_ADDR: {
5061                 struct kvm_vapic_addr va;
5062                 int idx;
5063
5064                 r = -EINVAL;
5065                 if (!lapic_in_kernel(vcpu))
5066                         goto out;
5067                 r = -EFAULT;
5068                 if (copy_from_user(&va, argp, sizeof(va)))
5069                         goto out;
5070                 idx = srcu_read_lock(&vcpu->kvm->srcu);
5071                 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
5072                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5073                 break;
5074         }
5075         case KVM_X86_SETUP_MCE: {
5076                 u64 mcg_cap;
5077
5078                 r = -EFAULT;
5079                 if (copy_from_user(&mcg_cap, argp, sizeof(mcg_cap)))
5080                         goto out;
5081                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
5082                 break;
5083         }
5084         case KVM_X86_SET_MCE: {
5085                 struct kvm_x86_mce mce;
5086
5087                 r = -EFAULT;
5088                 if (copy_from_user(&mce, argp, sizeof(mce)))
5089                         goto out;
5090                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
5091                 break;
5092         }
5093         case KVM_GET_VCPU_EVENTS: {
5094                 struct kvm_vcpu_events events;
5095
5096                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
5097
5098                 r = -EFAULT;
5099                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
5100                         break;
5101                 r = 0;
5102                 break;
5103         }
5104         case KVM_SET_VCPU_EVENTS: {
5105                 struct kvm_vcpu_events events;
5106
5107                 r = -EFAULT;
5108                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
5109                         break;
5110
5111                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
5112                 break;
5113         }
5114         case KVM_GET_DEBUGREGS: {
5115                 struct kvm_debugregs dbgregs;
5116
5117                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
5118
5119                 r = -EFAULT;
5120                 if (copy_to_user(argp, &dbgregs,
5121                                  sizeof(struct kvm_debugregs)))
5122                         break;
5123                 r = 0;
5124                 break;
5125         }
5126         case KVM_SET_DEBUGREGS: {
5127                 struct kvm_debugregs dbgregs;
5128
5129                 r = -EFAULT;
5130                 if (copy_from_user(&dbgregs, argp,
5131                                    sizeof(struct kvm_debugregs)))
5132                         break;
5133
5134                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
5135                 break;
5136         }
5137         case KVM_GET_XSAVE: {
5138                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL_ACCOUNT);
5139                 r = -ENOMEM;
5140                 if (!u.xsave)
5141                         break;
5142
5143                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
5144
5145                 r = -EFAULT;
5146                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
5147                         break;
5148                 r = 0;
5149                 break;
5150         }
5151         case KVM_SET_XSAVE: {
5152                 u.xsave = memdup_user(argp, sizeof(*u.xsave));
5153                 if (IS_ERR(u.xsave)) {
5154                         r = PTR_ERR(u.xsave);
5155                         goto out_nofree;
5156                 }
5157
5158                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
5159                 break;
5160         }
5161         case KVM_GET_XCRS: {
5162                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL_ACCOUNT);
5163                 r = -ENOMEM;
5164                 if (!u.xcrs)
5165                         break;
5166
5167                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
5168
5169                 r = -EFAULT;
5170                 if (copy_to_user(argp, u.xcrs,
5171                                  sizeof(struct kvm_xcrs)))
5172                         break;
5173                 r = 0;
5174                 break;
5175         }
5176         case KVM_SET_XCRS: {
5177                 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
5178                 if (IS_ERR(u.xcrs)) {
5179                         r = PTR_ERR(u.xcrs);
5180                         goto out_nofree;
5181                 }
5182
5183                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
5184                 break;
5185         }
5186         case KVM_SET_TSC_KHZ: {
5187                 u32 user_tsc_khz;
5188
5189                 r = -EINVAL;
5190                 user_tsc_khz = (u32)arg;
5191
5192                 if (kvm_has_tsc_control &&
5193                     user_tsc_khz >= kvm_max_guest_tsc_khz)
5194                         goto out;
5195
5196                 if (user_tsc_khz == 0)
5197                         user_tsc_khz = tsc_khz;
5198
5199                 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz))
5200                         r = 0;
5201
5202                 goto out;
5203         }
5204         case KVM_GET_TSC_KHZ: {
5205                 r = vcpu->arch.virtual_tsc_khz;
5206                 goto out;
5207         }
5208         case KVM_KVMCLOCK_CTRL: {
5209                 r = kvm_set_guest_paused(vcpu);
5210                 goto out;
5211         }
5212         case KVM_ENABLE_CAP: {
5213                 struct kvm_enable_cap cap;
5214
5215                 r = -EFAULT;
5216                 if (copy_from_user(&cap, argp, sizeof(cap)))
5217                         goto out;
5218                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
5219                 break;
5220         }
5221         case KVM_GET_NESTED_STATE: {
5222                 struct kvm_nested_state __user *user_kvm_nested_state = argp;
5223                 u32 user_data_size;
5224
5225                 r = -EINVAL;
5226                 if (!kvm_x86_ops.nested_ops->get_state)
5227                         break;
5228
5229                 BUILD_BUG_ON(sizeof(user_data_size) != sizeof(user_kvm_nested_state->size));
5230                 r = -EFAULT;
5231                 if (get_user(user_data_size, &user_kvm_nested_state->size))
5232                         break;
5233
5234                 r = kvm_x86_ops.nested_ops->get_state(vcpu, user_kvm_nested_state,
5235                                                      user_data_size);
5236                 if (r < 0)
5237                         break;
5238
5239                 if (r > user_data_size) {
5240                         if (put_user(r, &user_kvm_nested_state->size))
5241                                 r = -EFAULT;
5242                         else
5243                                 r = -E2BIG;
5244                         break;
5245                 }
5246
5247                 r = 0;
5248                 break;
5249         }
5250         case KVM_SET_NESTED_STATE: {
5251                 struct kvm_nested_state __user *user_kvm_nested_state = argp;
5252                 struct kvm_nested_state kvm_state;
5253                 int idx;
5254
5255                 r = -EINVAL;
5256                 if (!kvm_x86_ops.nested_ops->set_state)
5257                         break;
5258
5259                 r = -EFAULT;
5260                 if (copy_from_user(&kvm_state, user_kvm_nested_state, sizeof(kvm_state)))
5261                         break;
5262
5263                 r = -EINVAL;
5264                 if (kvm_state.size < sizeof(kvm_state))
5265                         break;
5266
5267                 if (kvm_state.flags &
5268                     ~(KVM_STATE_NESTED_RUN_PENDING | KVM_STATE_NESTED_GUEST_MODE
5269                       | KVM_STATE_NESTED_EVMCS | KVM_STATE_NESTED_MTF_PENDING
5270                       | KVM_STATE_NESTED_GIF_SET))
5271                         break;
5272
5273                 /* nested_run_pending implies guest_mode.  */
5274                 if ((kvm_state.flags & KVM_STATE_NESTED_RUN_PENDING)
5275                     && !(kvm_state.flags & KVM_STATE_NESTED_GUEST_MODE))
5276                         break;
5277
5278                 idx = srcu_read_lock(&vcpu->kvm->srcu);
5279                 r = kvm_x86_ops.nested_ops->set_state(vcpu, user_kvm_nested_state, &kvm_state);
5280                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5281                 break;
5282         }
5283         case KVM_GET_SUPPORTED_HV_CPUID:
5284                 r = kvm_ioctl_get_supported_hv_cpuid(vcpu, argp);
5285                 break;
5286 #ifdef CONFIG_KVM_XEN
5287         case KVM_XEN_VCPU_GET_ATTR: {
5288                 struct kvm_xen_vcpu_attr xva;
5289
5290                 r = -EFAULT;
5291                 if (copy_from_user(&xva, argp, sizeof(xva)))
5292                         goto out;
5293                 r = kvm_xen_vcpu_get_attr(vcpu, &xva);
5294                 if (!r && copy_to_user(argp, &xva, sizeof(xva)))
5295                         r = -EFAULT;
5296                 break;
5297         }
5298         case KVM_XEN_VCPU_SET_ATTR: {
5299                 struct kvm_xen_vcpu_attr xva;
5300
5301                 r = -EFAULT;
5302                 if (copy_from_user(&xva, argp, sizeof(xva)))
5303                         goto out;
5304                 r = kvm_xen_vcpu_set_attr(vcpu, &xva);
5305                 break;
5306         }
5307 #endif
5308         case KVM_GET_SREGS2: {
5309                 u.sregs2 = kzalloc(sizeof(struct kvm_sregs2), GFP_KERNEL);
5310                 r = -ENOMEM;
5311                 if (!u.sregs2)
5312                         goto out;
5313                 __get_sregs2(vcpu, u.sregs2);
5314                 r = -EFAULT;
5315                 if (copy_to_user(argp, u.sregs2, sizeof(struct kvm_sregs2)))
5316                         goto out;
5317                 r = 0;
5318                 break;
5319         }
5320         case KVM_SET_SREGS2: {
5321                 u.sregs2 = memdup_user(argp, sizeof(struct kvm_sregs2));
5322                 if (IS_ERR(u.sregs2)) {
5323                         r = PTR_ERR(u.sregs2);
5324                         u.sregs2 = NULL;
5325                         goto out;
5326                 }
5327                 r = __set_sregs2(vcpu, u.sregs2);
5328                 break;
5329         }
5330         default:
5331                 r = -EINVAL;
5332         }
5333 out:
5334         kfree(u.buffer);
5335 out_nofree:
5336         vcpu_put(vcpu);
5337         return r;
5338 }
5339
5340 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
5341 {
5342         return VM_FAULT_SIGBUS;
5343 }
5344
5345 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
5346 {
5347         int ret;
5348
5349         if (addr > (unsigned int)(-3 * PAGE_SIZE))
5350                 return -EINVAL;
5351         ret = static_call(kvm_x86_set_tss_addr)(kvm, addr);
5352         return ret;
5353 }
5354
5355 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
5356                                               u64 ident_addr)
5357 {
5358         return static_call(kvm_x86_set_identity_map_addr)(kvm, ident_addr);
5359 }
5360
5361 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
5362                                          unsigned long kvm_nr_mmu_pages)
5363 {
5364         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
5365                 return -EINVAL;
5366
5367         mutex_lock(&kvm->slots_lock);
5368
5369         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
5370         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
5371
5372         mutex_unlock(&kvm->slots_lock);
5373         return 0;
5374 }
5375
5376 static unsigned long kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
5377 {
5378         return kvm->arch.n_max_mmu_pages;
5379 }
5380
5381 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
5382 {
5383         struct kvm_pic *pic = kvm->arch.vpic;
5384         int r;
5385
5386         r = 0;
5387         switch (chip->chip_id) {
5388         case KVM_IRQCHIP_PIC_MASTER:
5389                 memcpy(&chip->chip.pic, &pic->pics[0],
5390                         sizeof(struct kvm_pic_state));
5391                 break;
5392         case KVM_IRQCHIP_PIC_SLAVE:
5393                 memcpy(&chip->chip.pic, &pic->pics[1],
5394                         sizeof(struct kvm_pic_state));
5395                 break;
5396         case KVM_IRQCHIP_IOAPIC:
5397                 kvm_get_ioapic(kvm, &chip->chip.ioapic);
5398                 break;
5399         default:
5400                 r = -EINVAL;
5401                 break;
5402         }
5403         return r;
5404 }
5405
5406 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
5407 {
5408         struct kvm_pic *pic = kvm->arch.vpic;
5409         int r;
5410
5411         r = 0;
5412         switch (chip->chip_id) {
5413         case KVM_IRQCHIP_PIC_MASTER:
5414                 spin_lock(&pic->lock);
5415                 memcpy(&pic->pics[0], &chip->chip.pic,
5416                         sizeof(struct kvm_pic_state));
5417                 spin_unlock(&pic->lock);
5418                 break;
5419         case KVM_IRQCHIP_PIC_SLAVE:
5420                 spin_lock(&pic->lock);
5421                 memcpy(&pic->pics[1], &chip->chip.pic,
5422                         sizeof(struct kvm_pic_state));
5423                 spin_unlock(&pic->lock);
5424                 break;
5425         case KVM_IRQCHIP_IOAPIC:
5426                 kvm_set_ioapic(kvm, &chip->chip.ioapic);
5427                 break;
5428         default:
5429                 r = -EINVAL;
5430                 break;
5431         }
5432         kvm_pic_update_irq(pic);
5433         return r;
5434 }
5435
5436 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
5437 {
5438         struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state;
5439
5440         BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels));
5441
5442         mutex_lock(&kps->lock);
5443         memcpy(ps, &kps->channels, sizeof(*ps));
5444         mutex_unlock(&kps->lock);
5445         return 0;
5446 }
5447
5448 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
5449 {
5450         int i;
5451         struct kvm_pit *pit = kvm->arch.vpit;
5452
5453         mutex_lock(&pit->pit_state.lock);
5454         memcpy(&pit->pit_state.channels, ps, sizeof(*ps));
5455         for (i = 0; i < 3; i++)
5456                 kvm_pit_load_count(pit, i, ps->channels[i].count, 0);
5457         mutex_unlock(&pit->pit_state.lock);
5458         return 0;
5459 }
5460
5461 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
5462 {
5463         mutex_lock(&kvm->arch.vpit->pit_state.lock);
5464         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
5465                 sizeof(ps->channels));
5466         ps->flags = kvm->arch.vpit->pit_state.flags;
5467         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
5468         memset(&ps->reserved, 0, sizeof(ps->reserved));
5469         return 0;
5470 }
5471
5472 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
5473 {
5474         int start = 0;
5475         int i;
5476         u32 prev_legacy, cur_legacy;
5477         struct kvm_pit *pit = kvm->arch.vpit;
5478
5479         mutex_lock(&pit->pit_state.lock);
5480         prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
5481         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
5482         if (!prev_legacy && cur_legacy)
5483                 start = 1;
5484         memcpy(&pit->pit_state.channels, &ps->channels,
5485                sizeof(pit->pit_state.channels));
5486         pit->pit_state.flags = ps->flags;
5487         for (i = 0; i < 3; i++)
5488                 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count,
5489                                    start && i == 0);
5490         mutex_unlock(&pit->pit_state.lock);
5491         return 0;
5492 }
5493
5494 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
5495                                  struct kvm_reinject_control *control)
5496 {
5497         struct kvm_pit *pit = kvm->arch.vpit;
5498
5499         /* pit->pit_state.lock was overloaded to prevent userspace from getting
5500          * an inconsistent state after running multiple KVM_REINJECT_CONTROL
5501          * ioctls in parallel.  Use a separate lock if that ioctl isn't rare.
5502          */
5503         mutex_lock(&pit->pit_state.lock);
5504         kvm_pit_set_reinject(pit, control->pit_reinject);
5505         mutex_unlock(&pit->pit_state.lock);
5506
5507         return 0;
5508 }
5509
5510 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
5511 {
5512
5513         /*
5514          * Flush all CPUs' dirty log buffers to the  dirty_bitmap.  Called
5515          * before reporting dirty_bitmap to userspace.  KVM flushes the buffers
5516          * on all VM-Exits, thus we only need to kick running vCPUs to force a
5517          * VM-Exit.
5518          */
5519         struct kvm_vcpu *vcpu;
5520         int i;
5521
5522         kvm_for_each_vcpu(i, vcpu, kvm)
5523                 kvm_vcpu_kick(vcpu);
5524 }
5525
5526 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
5527                         bool line_status)
5528 {
5529         if (!irqchip_in_kernel(kvm))
5530                 return -ENXIO;
5531
5532         irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
5533                                         irq_event->irq, irq_event->level,
5534                                         line_status);
5535         return 0;
5536 }
5537
5538 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
5539                             struct kvm_enable_cap *cap)
5540 {
5541         int r;
5542
5543         if (cap->flags)
5544                 return -EINVAL;
5545
5546         switch (cap->cap) {
5547         case KVM_CAP_DISABLE_QUIRKS:
5548                 kvm->arch.disabled_quirks = cap->args[0];
5549                 r = 0;
5550                 break;
5551         case KVM_CAP_SPLIT_IRQCHIP: {
5552                 mutex_lock(&kvm->lock);
5553                 r = -EINVAL;
5554                 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS)
5555                         goto split_irqchip_unlock;
5556                 r = -EEXIST;
5557                 if (irqchip_in_kernel(kvm))
5558                         goto split_irqchip_unlock;
5559                 if (kvm->created_vcpus)
5560                         goto split_irqchip_unlock;
5561                 r = kvm_setup_empty_irq_routing(kvm);
5562                 if (r)
5563                         goto split_irqchip_unlock;
5564                 /* Pairs with irqchip_in_kernel. */
5565                 smp_wmb();
5566                 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
5567                 kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
5568                 r = 0;
5569 split_irqchip_unlock:
5570                 mutex_unlock(&kvm->lock);
5571                 break;
5572         }
5573         case KVM_CAP_X2APIC_API:
5574                 r = -EINVAL;
5575                 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS)
5576                         break;
5577
5578                 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS)
5579                         kvm->arch.x2apic_format = true;
5580                 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
5581                         kvm->arch.x2apic_broadcast_quirk_disabled = true;
5582
5583                 r = 0;
5584                 break;
5585         case KVM_CAP_X86_DISABLE_EXITS:
5586                 r = -EINVAL;
5587                 if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS)
5588                         break;
5589
5590                 if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) &&
5591                         kvm_can_mwait_in_guest())
5592                         kvm->arch.mwait_in_guest = true;
5593                 if (cap->args[0] & KVM_X86_DISABLE_EXITS_HLT)
5594                         kvm->arch.hlt_in_guest = true;
5595                 if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE)
5596                         kvm->arch.pause_in_guest = true;
5597                 if (cap->args[0] & KVM_X86_DISABLE_EXITS_CSTATE)
5598                         kvm->arch.cstate_in_guest = true;
5599                 r = 0;
5600                 break;
5601         case KVM_CAP_MSR_PLATFORM_INFO:
5602                 kvm->arch.guest_can_read_msr_platform_info = cap->args[0];
5603                 r = 0;
5604                 break;
5605         case KVM_CAP_EXCEPTION_PAYLOAD:
5606                 kvm->arch.exception_payload_enabled = cap->args[0];
5607                 r = 0;
5608                 break;
5609         case KVM_CAP_X86_USER_SPACE_MSR:
5610                 kvm->arch.user_space_msr_mask = cap->args[0];
5611                 r = 0;
5612                 break;
5613         case KVM_CAP_X86_BUS_LOCK_EXIT:
5614                 r = -EINVAL;
5615                 if (cap->args[0] & ~KVM_BUS_LOCK_DETECTION_VALID_MODE)
5616                         break;
5617
5618                 if ((cap->args[0] & KVM_BUS_LOCK_DETECTION_OFF) &&
5619                     (cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT))
5620                         break;
5621
5622                 if (kvm_has_bus_lock_exit &&
5623                     cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT)
5624                         kvm->arch.bus_lock_detection_enabled = true;
5625                 r = 0;
5626                 break;
5627 #ifdef CONFIG_X86_SGX_KVM
5628         case KVM_CAP_SGX_ATTRIBUTE: {
5629                 unsigned long allowed_attributes = 0;
5630
5631                 r = sgx_set_attribute(&allowed_attributes, cap->args[0]);
5632                 if (r)
5633                         break;
5634
5635                 /* KVM only supports the PROVISIONKEY privileged attribute. */
5636                 if ((allowed_attributes & SGX_ATTR_PROVISIONKEY) &&
5637                     !(allowed_attributes & ~SGX_ATTR_PROVISIONKEY))
5638                         kvm->arch.sgx_provisioning_allowed = true;
5639                 else
5640                         r = -EINVAL;
5641                 break;
5642         }
5643 #endif
5644         case KVM_CAP_VM_COPY_ENC_CONTEXT_FROM:
5645                 r = -EINVAL;
5646                 if (kvm_x86_ops.vm_copy_enc_context_from)
5647                         r = kvm_x86_ops.vm_copy_enc_context_from(kvm, cap->args[0]);
5648                 return r;
5649         case KVM_CAP_EXIT_HYPERCALL:
5650                 if (cap->args[0] & ~KVM_EXIT_HYPERCALL_VALID_MASK) {
5651                         r = -EINVAL;
5652                         break;
5653                 }
5654                 kvm->arch.hypercall_exit_enabled = cap->args[0];
5655                 r = 0;
5656                 break;
5657         case KVM_CAP_EXIT_ON_EMULATION_FAILURE:
5658                 r = -EINVAL;
5659                 if (cap->args[0] & ~1)
5660                         break;
5661                 kvm->arch.exit_on_emulation_error = cap->args[0];
5662                 r = 0;
5663                 break;
5664         default:
5665                 r = -EINVAL;
5666                 break;
5667         }
5668         return r;
5669 }
5670
5671 static struct kvm_x86_msr_filter *kvm_alloc_msr_filter(bool default_allow)
5672 {
5673         struct kvm_x86_msr_filter *msr_filter;
5674
5675         msr_filter = kzalloc(sizeof(*msr_filter), GFP_KERNEL_ACCOUNT);
5676         if (!msr_filter)
5677                 return NULL;
5678
5679         msr_filter->default_allow = default_allow;
5680         return msr_filter;
5681 }
5682
5683 static void kvm_free_msr_filter(struct kvm_x86_msr_filter *msr_filter)
5684 {
5685         u32 i;
5686
5687         if (!msr_filter)
5688                 return;
5689
5690         for (i = 0; i < msr_filter->count; i++)
5691                 kfree(msr_filter->ranges[i].bitmap);
5692
5693         kfree(msr_filter);
5694 }
5695
5696 static int kvm_add_msr_filter(struct kvm_x86_msr_filter *msr_filter,
5697                               struct kvm_msr_filter_range *user_range)
5698 {
5699         unsigned long *bitmap = NULL;
5700         size_t bitmap_size;
5701
5702         if (!user_range->nmsrs)
5703                 return 0;
5704
5705         if (user_range->flags & ~(KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE))
5706                 return -EINVAL;
5707
5708         if (!user_range->flags)
5709                 return -EINVAL;
5710
5711         bitmap_size = BITS_TO_LONGS(user_range->nmsrs) * sizeof(long);
5712         if (!bitmap_size || bitmap_size > KVM_MSR_FILTER_MAX_BITMAP_SIZE)
5713                 return -EINVAL;
5714
5715         bitmap = memdup_user((__user u8*)user_range->bitmap, bitmap_size);
5716         if (IS_ERR(bitmap))
5717                 return PTR_ERR(bitmap);
5718
5719         msr_filter->ranges[msr_filter->count] = (struct msr_bitmap_range) {
5720                 .flags = user_range->flags,
5721                 .base = user_range->base,
5722                 .nmsrs = user_range->nmsrs,
5723                 .bitmap = bitmap,
5724         };
5725
5726         msr_filter->count++;
5727         return 0;
5728 }
5729
5730 static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, void __user *argp)
5731 {
5732         struct kvm_msr_filter __user *user_msr_filter = argp;
5733         struct kvm_x86_msr_filter *new_filter, *old_filter;
5734         struct kvm_msr_filter filter;
5735         bool default_allow;
5736         bool empty = true;
5737         int r = 0;
5738         u32 i;
5739
5740         if (copy_from_user(&filter, user_msr_filter, sizeof(filter)))
5741                 return -EFAULT;
5742
5743         for (i = 0; i < ARRAY_SIZE(filter.ranges); i++)
5744                 empty &= !filter.ranges[i].nmsrs;
5745
5746         default_allow = !(filter.flags & KVM_MSR_FILTER_DEFAULT_DENY);
5747         if (empty && !default_allow)
5748                 return -EINVAL;
5749
5750         new_filter = kvm_alloc_msr_filter(default_allow);
5751         if (!new_filter)
5752                 return -ENOMEM;
5753
5754         for (i = 0; i < ARRAY_SIZE(filter.ranges); i++) {
5755                 r = kvm_add_msr_filter(new_filter, &filter.ranges[i]);
5756                 if (r) {
5757                         kvm_free_msr_filter(new_filter);
5758                         return r;
5759                 }
5760         }
5761
5762         mutex_lock(&kvm->lock);
5763
5764         /* The per-VM filter is protected by kvm->lock... */
5765         old_filter = srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1);
5766
5767         rcu_assign_pointer(kvm->arch.msr_filter, new_filter);
5768         synchronize_srcu(&kvm->srcu);
5769
5770         kvm_free_msr_filter(old_filter);
5771
5772         kvm_make_all_cpus_request(kvm, KVM_REQ_MSR_FILTER_CHANGED);
5773         mutex_unlock(&kvm->lock);
5774
5775         return 0;
5776 }
5777
5778 #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
5779 static int kvm_arch_suspend_notifier(struct kvm *kvm)
5780 {
5781         struct kvm_vcpu *vcpu;
5782         int i, ret = 0;
5783
5784         mutex_lock(&kvm->lock);
5785         kvm_for_each_vcpu(i, vcpu, kvm) {
5786                 if (!vcpu->arch.pv_time_enabled)
5787                         continue;
5788
5789                 ret = kvm_set_guest_paused(vcpu);
5790                 if (ret) {
5791                         kvm_err("Failed to pause guest VCPU%d: %d\n",
5792                                 vcpu->vcpu_id, ret);
5793                         break;
5794                 }
5795         }
5796         mutex_unlock(&kvm->lock);
5797
5798         return ret ? NOTIFY_BAD : NOTIFY_DONE;
5799 }
5800
5801 int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state)
5802 {
5803         switch (state) {
5804         case PM_HIBERNATION_PREPARE:
5805         case PM_SUSPEND_PREPARE:
5806                 return kvm_arch_suspend_notifier(kvm);
5807         }
5808
5809         return NOTIFY_DONE;
5810 }
5811 #endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */
5812
5813 long kvm_arch_vm_ioctl(struct file *filp,
5814                        unsigned int ioctl, unsigned long arg)
5815 {
5816         struct kvm *kvm = filp->private_data;
5817         void __user *argp = (void __user *)arg;
5818         int r = -ENOTTY;
5819         /*
5820          * This union makes it completely explicit to gcc-3.x
5821          * that these two variables' stack usage should be
5822          * combined, not added together.
5823          */
5824         union {
5825                 struct kvm_pit_state ps;
5826                 struct kvm_pit_state2 ps2;
5827                 struct kvm_pit_config pit_config;
5828         } u;
5829
5830         switch (ioctl) {
5831         case KVM_SET_TSS_ADDR:
5832                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
5833                 break;
5834         case KVM_SET_IDENTITY_MAP_ADDR: {
5835                 u64 ident_addr;
5836
5837                 mutex_lock(&kvm->lock);
5838                 r = -EINVAL;
5839                 if (kvm->created_vcpus)
5840                         goto set_identity_unlock;
5841                 r = -EFAULT;
5842                 if (copy_from_user(&ident_addr, argp, sizeof(ident_addr)))
5843                         goto set_identity_unlock;
5844                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
5845 set_identity_unlock:
5846                 mutex_unlock(&kvm->lock);
5847                 break;
5848         }
5849         case KVM_SET_NR_MMU_PAGES:
5850                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
5851                 break;
5852         case KVM_GET_NR_MMU_PAGES:
5853                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
5854                 break;
5855         case KVM_CREATE_IRQCHIP: {
5856                 mutex_lock(&kvm->lock);
5857
5858                 r = -EEXIST;
5859                 if (irqchip_in_kernel(kvm))
5860                         goto create_irqchip_unlock;
5861
5862                 r = -EINVAL;
5863                 if (kvm->created_vcpus)
5864                         goto create_irqchip_unlock;
5865
5866                 r = kvm_pic_init(kvm);
5867                 if (r)
5868                         goto create_irqchip_unlock;
5869
5870                 r = kvm_ioapic_init(kvm);
5871                 if (r) {
5872                         kvm_pic_destroy(kvm);
5873                         goto create_irqchip_unlock;
5874                 }
5875
5876                 r = kvm_setup_default_irq_routing(kvm);
5877                 if (r) {
5878                         kvm_ioapic_destroy(kvm);
5879                         kvm_pic_destroy(kvm);
5880                         goto create_irqchip_unlock;
5881                 }
5882                 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */
5883                 smp_wmb();
5884                 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
5885         create_irqchip_unlock:
5886                 mutex_unlock(&kvm->lock);
5887                 break;
5888         }
5889         case KVM_CREATE_PIT:
5890                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
5891                 goto create_pit;
5892         case KVM_CREATE_PIT2:
5893                 r = -EFAULT;
5894                 if (copy_from_user(&u.pit_config, argp,
5895                                    sizeof(struct kvm_pit_config)))
5896                         goto out;
5897         create_pit:
5898                 mutex_lock(&kvm->lock);
5899                 r = -EEXIST;
5900                 if (kvm->arch.vpit)
5901                         goto create_pit_unlock;
5902                 r = -ENOMEM;
5903                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
5904                 if (kvm->arch.vpit)
5905                         r = 0;
5906         create_pit_unlock:
5907                 mutex_unlock(&kvm->lock);
5908                 break;
5909         case KVM_GET_IRQCHIP: {
5910                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
5911                 struct kvm_irqchip *chip;
5912
5913                 chip = memdup_user(argp, sizeof(*chip));
5914                 if (IS_ERR(chip)) {
5915                         r = PTR_ERR(chip);
5916                         goto out;
5917                 }
5918
5919                 r = -ENXIO;
5920                 if (!irqchip_kernel(kvm))
5921                         goto get_irqchip_out;
5922                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
5923                 if (r)
5924                         goto get_irqchip_out;
5925                 r = -EFAULT;
5926                 if (copy_to_user(argp, chip, sizeof(*chip)))
5927                         goto get_irqchip_out;
5928                 r = 0;
5929         get_irqchip_out:
5930                 kfree(chip);
5931                 break;
5932         }
5933         case KVM_SET_IRQCHIP: {
5934                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
5935                 struct kvm_irqchip *chip;
5936
5937                 chip = memdup_user(argp, sizeof(*chip));
5938                 if (IS_ERR(chip)) {
5939                         r = PTR_ERR(chip);
5940                         goto out;
5941                 }
5942
5943                 r = -ENXIO;
5944                 if (!irqchip_kernel(kvm))
5945                         goto set_irqchip_out;
5946                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
5947         set_irqchip_out:
5948                 kfree(chip);
5949                 break;
5950         }
5951         case KVM_GET_PIT: {
5952                 r = -EFAULT;
5953                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
5954                         goto out;
5955                 r = -ENXIO;
5956                 if (!kvm->arch.vpit)
5957                         goto out;
5958                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
5959                 if (r)
5960                         goto out;
5961                 r = -EFAULT;
5962                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
5963                         goto out;
5964                 r = 0;
5965                 break;
5966         }
5967         case KVM_SET_PIT: {
5968                 r = -EFAULT;
5969                 if (copy_from_user(&u.ps, argp, sizeof(u.ps)))
5970                         goto out;
5971                 mutex_lock(&kvm->lock);
5972                 r = -ENXIO;
5973                 if (!kvm->arch.vpit)
5974                         goto set_pit_out;
5975                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
5976 set_pit_out:
5977                 mutex_unlock(&kvm->lock);
5978                 break;
5979         }
5980         case KVM_GET_PIT2: {
5981                 r = -ENXIO;
5982                 if (!kvm->arch.vpit)
5983                         goto out;
5984                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
5985                 if (r)
5986                         goto out;
5987                 r = -EFAULT;
5988                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
5989                         goto out;
5990                 r = 0;
5991                 break;
5992         }
5993         case KVM_SET_PIT2: {
5994                 r = -EFAULT;
5995                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
5996                         goto out;
5997                 mutex_lock(&kvm->lock);
5998                 r = -ENXIO;
5999                 if (!kvm->arch.vpit)
6000                         goto set_pit2_out;
6001                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
6002 set_pit2_out:
6003                 mutex_unlock(&kvm->lock);
6004                 break;
6005         }
6006         case KVM_REINJECT_CONTROL: {
6007                 struct kvm_reinject_control control;
6008                 r =  -EFAULT;
6009                 if (copy_from_user(&control, argp, sizeof(control)))
6010                         goto out;
6011                 r = -ENXIO;
6012                 if (!kvm->arch.vpit)
6013                         goto out;
6014                 r = kvm_vm_ioctl_reinject(kvm, &control);
6015                 break;
6016         }
6017         case KVM_SET_BOOT_CPU_ID:
6018                 r = 0;
6019                 mutex_lock(&kvm->lock);
6020                 if (kvm->created_vcpus)
6021                         r = -EBUSY;
6022                 else
6023                         kvm->arch.bsp_vcpu_id = arg;
6024                 mutex_unlock(&kvm->lock);
6025                 break;
6026 #ifdef CONFIG_KVM_XEN
6027         case KVM_XEN_HVM_CONFIG: {
6028                 struct kvm_xen_hvm_config xhc;
6029                 r = -EFAULT;
6030                 if (copy_from_user(&xhc, argp, sizeof(xhc)))
6031                         goto out;
6032                 r = kvm_xen_hvm_config(kvm, &xhc);
6033                 break;
6034         }
6035         case KVM_XEN_HVM_GET_ATTR: {
6036                 struct kvm_xen_hvm_attr xha;
6037
6038                 r = -EFAULT;
6039                 if (copy_from_user(&xha, argp, sizeof(xha)))
6040                         goto out;
6041                 r = kvm_xen_hvm_get_attr(kvm, &xha);
6042                 if (!r && copy_to_user(argp, &xha, sizeof(xha)))
6043                         r = -EFAULT;
6044                 break;
6045         }
6046         case KVM_XEN_HVM_SET_ATTR: {
6047                 struct kvm_xen_hvm_attr xha;
6048
6049                 r = -EFAULT;
6050                 if (copy_from_user(&xha, argp, sizeof(xha)))
6051                         goto out;
6052                 r = kvm_xen_hvm_set_attr(kvm, &xha);
6053                 break;
6054         }
6055 #endif
6056         case KVM_SET_CLOCK: {
6057                 struct kvm_arch *ka = &kvm->arch;
6058                 struct kvm_clock_data user_ns;
6059                 u64 now_ns;
6060
6061                 r = -EFAULT;
6062                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
6063                         goto out;
6064
6065                 r = -EINVAL;
6066                 if (user_ns.flags)
6067                         goto out;
6068
6069                 r = 0;
6070                 /*
6071                  * TODO: userspace has to take care of races with VCPU_RUN, so
6072                  * kvm_gen_update_masterclock() can be cut down to locked
6073                  * pvclock_update_vm_gtod_copy().
6074                  */
6075                 kvm_gen_update_masterclock(kvm);
6076
6077                 /*
6078                  * This pairs with kvm_guest_time_update(): when masterclock is
6079                  * in use, we use master_kernel_ns + kvmclock_offset to set
6080                  * unsigned 'system_time' so if we use get_kvmclock_ns() (which
6081                  * is slightly ahead) here we risk going negative on unsigned
6082                  * 'system_time' when 'user_ns.clock' is very small.
6083                  */
6084                 spin_lock_irq(&ka->pvclock_gtod_sync_lock);
6085                 if (kvm->arch.use_master_clock)
6086                         now_ns = ka->master_kernel_ns;
6087                 else
6088                         now_ns = get_kvmclock_base_ns();
6089                 ka->kvmclock_offset = user_ns.clock - now_ns;
6090                 spin_unlock_irq(&ka->pvclock_gtod_sync_lock);
6091
6092                 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE);
6093                 break;
6094         }
6095         case KVM_GET_CLOCK: {
6096                 struct kvm_clock_data user_ns;
6097                 u64 now_ns;
6098
6099                 now_ns = get_kvmclock_ns(kvm);
6100                 user_ns.clock = now_ns;
6101                 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0;
6102                 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
6103
6104                 r = -EFAULT;
6105                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
6106                         goto out;
6107                 r = 0;
6108                 break;
6109         }
6110         case KVM_MEMORY_ENCRYPT_OP: {
6111                 r = -ENOTTY;
6112                 if (kvm_x86_ops.mem_enc_op)
6113                         r = static_call(kvm_x86_mem_enc_op)(kvm, argp);
6114                 break;
6115         }
6116         case KVM_MEMORY_ENCRYPT_REG_REGION: {
6117                 struct kvm_enc_region region;
6118
6119                 r = -EFAULT;
6120                 if (copy_from_user(&region, argp, sizeof(region)))
6121                         goto out;
6122
6123                 r = -ENOTTY;
6124                 if (kvm_x86_ops.mem_enc_reg_region)
6125                         r = static_call(kvm_x86_mem_enc_reg_region)(kvm, &region);
6126                 break;
6127         }
6128         case KVM_MEMORY_ENCRYPT_UNREG_REGION: {
6129                 struct kvm_enc_region region;
6130
6131                 r = -EFAULT;
6132                 if (copy_from_user(&region, argp, sizeof(region)))
6133                         goto out;
6134
6135                 r = -ENOTTY;
6136                 if (kvm_x86_ops.mem_enc_unreg_region)
6137                         r = static_call(kvm_x86_mem_enc_unreg_region)(kvm, &region);
6138                 break;
6139         }
6140         case KVM_HYPERV_EVENTFD: {
6141                 struct kvm_hyperv_eventfd hvevfd;
6142
6143                 r = -EFAULT;
6144                 if (copy_from_user(&hvevfd, argp, sizeof(hvevfd)))
6145                         goto out;
6146                 r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd);
6147                 break;
6148         }
6149         case KVM_SET_PMU_EVENT_FILTER:
6150                 r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp);
6151                 break;
6152         case KVM_X86_SET_MSR_FILTER:
6153                 r = kvm_vm_ioctl_set_msr_filter(kvm, argp);
6154                 break;
6155         default:
6156                 r = -ENOTTY;
6157         }
6158 out:
6159         return r;
6160 }
6161
6162 static void kvm_init_msr_list(void)
6163 {
6164         struct x86_pmu_capability x86_pmu;
6165         u32 dummy[2];
6166         unsigned i;
6167
6168         BUILD_BUG_ON_MSG(INTEL_PMC_MAX_FIXED != 4,
6169                          "Please update the fixed PMCs in msrs_to_saved_all[]");
6170
6171         perf_get_x86_pmu_capability(&x86_pmu);
6172
6173         num_msrs_to_save = 0;
6174         num_emulated_msrs = 0;
6175         num_msr_based_features = 0;
6176
6177         for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) {
6178                 if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0)
6179                         continue;
6180
6181                 /*
6182                  * Even MSRs that are valid in the host may not be exposed
6183                  * to the guests in some cases.
6184                  */
6185                 switch (msrs_to_save_all[i]) {
6186                 case MSR_IA32_BNDCFGS:
6187                         if (!kvm_mpx_supported())
6188                                 continue;
6189                         break;
6190                 case MSR_TSC_AUX:
6191                         if (!kvm_cpu_cap_has(X86_FEATURE_RDTSCP) &&
6192                             !kvm_cpu_cap_has(X86_FEATURE_RDPID))
6193                                 continue;
6194                         break;
6195                 case MSR_IA32_UMWAIT_CONTROL:
6196                         if (!kvm_cpu_cap_has(X86_FEATURE_WAITPKG))
6197                                 continue;
6198                         break;
6199                 case MSR_IA32_RTIT_CTL:
6200                 case MSR_IA32_RTIT_STATUS:
6201                         if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT))
6202                                 continue;
6203                         break;
6204                 case MSR_IA32_RTIT_CR3_MATCH:
6205                         if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
6206                             !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering))
6207                                 continue;
6208                         break;
6209                 case MSR_IA32_RTIT_OUTPUT_BASE:
6210                 case MSR_IA32_RTIT_OUTPUT_MASK:
6211                         if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
6212                                 (!intel_pt_validate_hw_cap(PT_CAP_topa_output) &&
6213                                  !intel_pt_validate_hw_cap(PT_CAP_single_range_output)))
6214                                 continue;
6215                         break;
6216                 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B:
6217                         if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
6218                                 msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >=
6219                                 intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2)
6220                                 continue;
6221                         break;
6222                 case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR0 + 17:
6223                         if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_PERFCTR0 >=
6224                             min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
6225                                 continue;
6226                         break;
6227                 case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL0 + 17:
6228                         if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >=
6229                             min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
6230                                 continue;
6231                         break;
6232                 default:
6233                         break;
6234                 }
6235
6236                 msrs_to_save[num_msrs_to_save++] = msrs_to_save_all[i];
6237         }
6238
6239         for (i = 0; i < ARRAY_SIZE(emulated_msrs_all); i++) {
6240                 if (!static_call(kvm_x86_has_emulated_msr)(NULL, emulated_msrs_all[i]))
6241                         continue;
6242
6243                 emulated_msrs[num_emulated_msrs++] = emulated_msrs_all[i];
6244         }
6245
6246         for (i = 0; i < ARRAY_SIZE(msr_based_features_all); i++) {
6247                 struct kvm_msr_entry msr;
6248
6249                 msr.index = msr_based_features_all[i];
6250                 if (kvm_get_msr_feature(&msr))
6251                         continue;
6252
6253                 msr_based_features[num_msr_based_features++] = msr_based_features_all[i];
6254         }
6255 }
6256
6257 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
6258                            const void *v)
6259 {
6260         int handled = 0;
6261         int n;
6262
6263         do {
6264                 n = min(len, 8);
6265                 if (!(lapic_in_kernel(vcpu) &&
6266                       !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v))
6267                     && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v))
6268                         break;
6269                 handled += n;
6270                 addr += n;
6271                 len -= n;
6272                 v += n;
6273         } while (len);
6274
6275         return handled;
6276 }
6277
6278 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
6279 {
6280         int handled = 0;
6281         int n;
6282
6283         do {
6284                 n = min(len, 8);
6285                 if (!(lapic_in_kernel(vcpu) &&
6286                       !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev,
6287                                          addr, n, v))
6288                     && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v))
6289                         break;
6290                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v);
6291                 handled += n;
6292                 addr += n;
6293                 len -= n;
6294                 v += n;
6295         } while (len);
6296
6297         return handled;
6298 }
6299
6300 static void kvm_set_segment(struct kvm_vcpu *vcpu,
6301                         struct kvm_segment *var, int seg)
6302 {
6303         static_call(kvm_x86_set_segment)(vcpu, var, seg);
6304 }
6305
6306 void kvm_get_segment(struct kvm_vcpu *vcpu,
6307                      struct kvm_segment *var, int seg)
6308 {
6309         static_call(kvm_x86_get_segment)(vcpu, var, seg);
6310 }
6311
6312 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
6313                            struct x86_exception *exception)
6314 {
6315         gpa_t t_gpa;
6316
6317         BUG_ON(!mmu_is_nested(vcpu));
6318
6319         /* NPT walks are always user-walks */
6320         access |= PFERR_USER_MASK;
6321         t_gpa  = vcpu->arch.mmu->gva_to_gpa(vcpu, gpa, access, exception);
6322
6323         return t_gpa;
6324 }
6325
6326 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
6327                               struct x86_exception *exception)
6328 {
6329         u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
6330         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
6331 }
6332 EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read);
6333
6334  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
6335                                 struct x86_exception *exception)
6336 {
6337         u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
6338         access |= PFERR_FETCH_MASK;
6339         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
6340 }
6341
6342 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
6343                                struct x86_exception *exception)
6344 {
6345         u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
6346         access |= PFERR_WRITE_MASK;
6347         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
6348 }
6349 EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_write);
6350
6351 /* uses this to access any guest's mapped memory without checking CPL */
6352 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
6353                                 struct x86_exception *exception)
6354 {
6355         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
6356 }
6357
6358 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
6359                                       struct kvm_vcpu *vcpu, u32 access,
6360                                       struct x86_exception *exception)
6361 {
6362         void *data = val;
6363         int r = X86EMUL_CONTINUE;
6364
6365         while (bytes) {
6366                 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
6367                                                             exception);
6368                 unsigned offset = addr & (PAGE_SIZE-1);
6369                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
6370                 int ret;
6371
6372                 if (gpa == UNMAPPED_GVA)
6373                         return X86EMUL_PROPAGATE_FAULT;
6374                 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
6375                                                offset, toread);
6376                 if (ret < 0) {
6377                         r = X86EMUL_IO_NEEDED;
6378                         goto out;
6379                 }
6380
6381                 bytes -= toread;
6382                 data += toread;
6383                 addr += toread;
6384         }
6385 out:
6386         return r;
6387 }
6388
6389 /* used for instruction fetching */
6390 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
6391                                 gva_t addr, void *val, unsigned int bytes,
6392                                 struct x86_exception *exception)
6393 {
6394         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6395         u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
6396         unsigned offset;
6397         int ret;
6398
6399         /* Inline kvm_read_guest_virt_helper for speed.  */
6400         gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK,
6401                                                     exception);
6402         if (unlikely(gpa == UNMAPPED_GVA))
6403                 return X86EMUL_PROPAGATE_FAULT;
6404
6405         offset = addr & (PAGE_SIZE-1);
6406         if (WARN_ON(offset + bytes > PAGE_SIZE))
6407                 bytes = (unsigned)PAGE_SIZE - offset;
6408         ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val,
6409                                        offset, bytes);
6410         if (unlikely(ret < 0))
6411                 return X86EMUL_IO_NEEDED;
6412
6413         return X86EMUL_CONTINUE;
6414 }
6415
6416 int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
6417                                gva_t addr, void *val, unsigned int bytes,
6418                                struct x86_exception *exception)
6419 {
6420         u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
6421
6422         /*
6423          * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED
6424          * is returned, but our callers are not ready for that and they blindly
6425          * call kvm_inject_page_fault.  Ensure that they at least do not leak
6426          * uninitialized kernel stack memory into cr2 and error code.
6427          */
6428         memset(exception, 0, sizeof(*exception));
6429         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
6430                                           exception);
6431 }
6432 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
6433
6434 static int emulator_read_std(struct x86_emulate_ctxt *ctxt,
6435                              gva_t addr, void *val, unsigned int bytes,
6436                              struct x86_exception *exception, bool system)
6437 {
6438         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6439         u32 access = 0;
6440
6441         if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3)
6442                 access |= PFERR_USER_MASK;
6443
6444         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception);
6445 }
6446
6447 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt,
6448                 unsigned long addr, void *val, unsigned int bytes)
6449 {
6450         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6451         int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes);
6452
6453         return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE;
6454 }
6455
6456 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
6457                                       struct kvm_vcpu *vcpu, u32 access,
6458                                       struct x86_exception *exception)
6459 {
6460         void *data = val;
6461         int r = X86EMUL_CONTINUE;
6462
6463         while (bytes) {
6464                 gpa_t gpa =  vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
6465                                                              access,
6466                                                              exception);
6467                 unsigned offset = addr & (PAGE_SIZE-1);
6468                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
6469                 int ret;
6470
6471                 if (gpa == UNMAPPED_GVA)
6472                         return X86EMUL_PROPAGATE_FAULT;
6473                 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite);
6474                 if (ret < 0) {
6475                         r = X86EMUL_IO_NEEDED;
6476                         goto out;
6477                 }
6478
6479                 bytes -= towrite;
6480                 data += towrite;
6481                 addr += towrite;
6482         }
6483 out:
6484         return r;
6485 }
6486
6487 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val,
6488                               unsigned int bytes, struct x86_exception *exception,
6489                               bool system)
6490 {
6491         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6492         u32 access = PFERR_WRITE_MASK;
6493
6494         if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3)
6495                 access |= PFERR_USER_MASK;
6496
6497         return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
6498                                            access, exception);
6499 }
6500
6501 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val,
6502                                 unsigned int bytes, struct x86_exception *exception)
6503 {
6504         /* kvm_write_guest_virt_system can pull in tons of pages. */
6505         vcpu->arch.l1tf_flush_l1d = true;
6506
6507         return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
6508                                            PFERR_WRITE_MASK, exception);
6509 }
6510 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
6511
6512 int handle_ud(struct kvm_vcpu *vcpu)
6513 {
6514         static const char kvm_emulate_prefix[] = { __KVM_EMULATE_PREFIX };
6515         int emul_type = EMULTYPE_TRAP_UD;
6516         char sig[5]; /* ud2; .ascii "kvm" */
6517         struct x86_exception e;
6518
6519         if (unlikely(!static_call(kvm_x86_can_emulate_instruction)(vcpu, NULL, 0)))
6520                 return 1;
6521
6522         if (force_emulation_prefix &&
6523             kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu),
6524                                 sig, sizeof(sig), &e) == 0 &&
6525             memcmp(sig, kvm_emulate_prefix, sizeof(sig)) == 0) {
6526                 kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig));
6527                 emul_type = EMULTYPE_TRAP_UD_FORCED;
6528         }
6529
6530         return kvm_emulate_instruction(vcpu, emul_type);
6531 }
6532 EXPORT_SYMBOL_GPL(handle_ud);
6533
6534 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
6535                             gpa_t gpa, bool write)
6536 {
6537         /* For APIC access vmexit */
6538         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
6539                 return 1;
6540
6541         if (vcpu_match_mmio_gpa(vcpu, gpa)) {
6542                 trace_vcpu_match_mmio(gva, gpa, write, true);
6543                 return 1;
6544         }
6545
6546         return 0;
6547 }
6548
6549 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
6550                                 gpa_t *gpa, struct x86_exception *exception,
6551                                 bool write)
6552 {
6553         u32 access = ((static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0)
6554                 | (write ? PFERR_WRITE_MASK : 0);
6555
6556         /*
6557          * currently PKRU is only applied to ept enabled guest so
6558          * there is no pkey in EPT page table for L1 guest or EPT
6559          * shadow page table for L2 guest.
6560          */
6561         if (vcpu_match_mmio_gva(vcpu, gva)
6562             && !permission_fault(vcpu, vcpu->arch.walk_mmu,
6563                                  vcpu->arch.mmio_access, 0, access)) {
6564                 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
6565                                         (gva & (PAGE_SIZE - 1));
6566                 trace_vcpu_match_mmio(gva, *gpa, write, false);
6567                 return 1;
6568         }
6569
6570         *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
6571
6572         if (*gpa == UNMAPPED_GVA)
6573                 return -1;
6574
6575         return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write);
6576 }
6577
6578 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
6579                         const void *val, int bytes)
6580 {
6581         int ret;
6582
6583         ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes);
6584         if (ret < 0)
6585                 return 0;
6586         kvm_page_track_write(vcpu, gpa, val, bytes);
6587         return 1;
6588 }
6589
6590 struct read_write_emulator_ops {
6591         int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
6592                                   int bytes);
6593         int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
6594                                   void *val, int bytes);
6595         int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
6596                                int bytes, void *val);
6597         int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
6598                                     void *val, int bytes);
6599         bool write;
6600 };
6601
6602 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
6603 {
6604         if (vcpu->mmio_read_completed) {
6605                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
6606                                vcpu->mmio_fragments[0].gpa, val);
6607                 vcpu->mmio_read_completed = 0;
6608                 return 1;
6609         }
6610
6611         return 0;
6612 }
6613
6614 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
6615                         void *val, int bytes)
6616 {
6617         return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes);
6618 }
6619
6620 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
6621                          void *val, int bytes)
6622 {
6623         return emulator_write_phys(vcpu, gpa, val, bytes);
6624 }
6625
6626 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
6627 {
6628         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val);
6629         return vcpu_mmio_write(vcpu, gpa, bytes, val);
6630 }
6631
6632 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
6633                           void *val, int bytes)
6634 {
6635         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL);
6636         return X86EMUL_IO_NEEDED;
6637 }
6638
6639 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
6640                            void *val, int bytes)
6641 {
6642         struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
6643
6644         memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
6645         return X86EMUL_CONTINUE;
6646 }
6647
6648 static const struct read_write_emulator_ops read_emultor = {
6649         .read_write_prepare = read_prepare,
6650         .read_write_emulate = read_emulate,
6651         .read_write_mmio = vcpu_mmio_read,
6652         .read_write_exit_mmio = read_exit_mmio,
6653 };
6654
6655 static const struct read_write_emulator_ops write_emultor = {
6656         .read_write_emulate = write_emulate,
6657         .read_write_mmio = write_mmio,
6658         .read_write_exit_mmio = write_exit_mmio,
6659         .write = true,
6660 };
6661
6662 static int emulator_read_write_onepage(unsigned long addr, void *val,
6663                                        unsigned int bytes,
6664                                        struct x86_exception *exception,
6665                                        struct kvm_vcpu *vcpu,
6666                                        const struct read_write_emulator_ops *ops)
6667 {
6668         gpa_t gpa;
6669         int handled, ret;
6670         bool write = ops->write;
6671         struct kvm_mmio_fragment *frag;
6672         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
6673
6674         /*
6675          * If the exit was due to a NPF we may already have a GPA.
6676          * If the GPA is present, use it to avoid the GVA to GPA table walk.
6677          * Note, this cannot be used on string operations since string
6678          * operation using rep will only have the initial GPA from the NPF
6679          * occurred.
6680          */
6681         if (ctxt->gpa_available && emulator_can_use_gpa(ctxt) &&
6682             (addr & ~PAGE_MASK) == (ctxt->gpa_val & ~PAGE_MASK)) {
6683                 gpa = ctxt->gpa_val;
6684                 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write);
6685         } else {
6686                 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
6687                 if (ret < 0)
6688                         return X86EMUL_PROPAGATE_FAULT;
6689         }
6690
6691         if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes))
6692                 return X86EMUL_CONTINUE;
6693
6694         /*
6695          * Is this MMIO handled locally?
6696          */
6697         handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
6698         if (handled == bytes)
6699                 return X86EMUL_CONTINUE;
6700
6701         gpa += handled;
6702         bytes -= handled;
6703         val += handled;
6704
6705         WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS);
6706         frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
6707         frag->gpa = gpa;
6708         frag->data = val;
6709         frag->len = bytes;
6710         return X86EMUL_CONTINUE;
6711 }
6712
6713 static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
6714                         unsigned long addr,
6715                         void *val, unsigned int bytes,
6716                         struct x86_exception *exception,
6717                         const struct read_write_emulator_ops *ops)
6718 {
6719         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6720         gpa_t gpa;
6721         int rc;
6722
6723         if (ops->read_write_prepare &&
6724                   ops->read_write_prepare(vcpu, val, bytes))
6725                 return X86EMUL_CONTINUE;
6726
6727         vcpu->mmio_nr_fragments = 0;
6728
6729         /* Crossing a page boundary? */
6730         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
6731                 int now;
6732
6733                 now = -addr & ~PAGE_MASK;
6734                 rc = emulator_read_write_onepage(addr, val, now, exception,
6735                                                  vcpu, ops);
6736
6737                 if (rc != X86EMUL_CONTINUE)
6738                         return rc;
6739                 addr += now;
6740                 if (ctxt->mode != X86EMUL_MODE_PROT64)
6741                         addr = (u32)addr;
6742                 val += now;
6743                 bytes -= now;
6744         }
6745
6746         rc = emulator_read_write_onepage(addr, val, bytes, exception,
6747                                          vcpu, ops);
6748         if (rc != X86EMUL_CONTINUE)
6749                 return rc;
6750
6751         if (!vcpu->mmio_nr_fragments)
6752                 return rc;
6753
6754         gpa = vcpu->mmio_fragments[0].gpa;
6755
6756         vcpu->mmio_needed = 1;
6757         vcpu->mmio_cur_fragment = 0;
6758
6759         vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len);
6760         vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
6761         vcpu->run->exit_reason = KVM_EXIT_MMIO;
6762         vcpu->run->mmio.phys_addr = gpa;
6763
6764         return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
6765 }
6766
6767 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
6768                                   unsigned long addr,
6769                                   void *val,
6770                                   unsigned int bytes,
6771                                   struct x86_exception *exception)
6772 {
6773         return emulator_read_write(ctxt, addr, val, bytes,
6774                                    exception, &read_emultor);
6775 }
6776
6777 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
6778                             unsigned long addr,
6779                             const void *val,
6780                             unsigned int bytes,
6781                             struct x86_exception *exception)
6782 {
6783         return emulator_read_write(ctxt, addr, (void *)val, bytes,
6784                                    exception, &write_emultor);
6785 }
6786
6787 #define CMPXCHG_TYPE(t, ptr, old, new) \
6788         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
6789
6790 #ifdef CONFIG_X86_64
6791 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
6792 #else
6793 #  define CMPXCHG64(ptr, old, new) \
6794         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
6795 #endif
6796
6797 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
6798                                      unsigned long addr,
6799                                      const void *old,
6800                                      const void *new,
6801                                      unsigned int bytes,
6802                                      struct x86_exception *exception)
6803 {
6804         struct kvm_host_map map;
6805         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6806         u64 page_line_mask;
6807         gpa_t gpa;
6808         char *kaddr;
6809         bool exchanged;
6810
6811         /* guests cmpxchg8b have to be emulated atomically */
6812         if (bytes > 8 || (bytes & (bytes - 1)))
6813                 goto emul_write;
6814
6815         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
6816
6817         if (gpa == UNMAPPED_GVA ||
6818             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
6819                 goto emul_write;
6820
6821         /*
6822          * Emulate the atomic as a straight write to avoid #AC if SLD is
6823          * enabled in the host and the access splits a cache line.
6824          */
6825         if (boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT))
6826                 page_line_mask = ~(cache_line_size() - 1);
6827         else
6828                 page_line_mask = PAGE_MASK;
6829
6830         if (((gpa + bytes - 1) & page_line_mask) != (gpa & page_line_mask))
6831                 goto emul_write;
6832
6833         if (kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), &map))
6834                 goto emul_write;
6835
6836         kaddr = map.hva + offset_in_page(gpa);
6837
6838         switch (bytes) {
6839         case 1:
6840                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
6841                 break;
6842         case 2:
6843                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
6844                 break;
6845         case 4:
6846                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
6847                 break;
6848         case 8:
6849                 exchanged = CMPXCHG64(kaddr, old, new);
6850                 break;
6851         default:
6852                 BUG();
6853         }
6854
6855         kvm_vcpu_unmap(vcpu, &map, true);
6856
6857         if (!exchanged)
6858                 return X86EMUL_CMPXCHG_FAILED;
6859
6860         kvm_page_track_write(vcpu, gpa, new, bytes);
6861
6862         return X86EMUL_CONTINUE;
6863
6864 emul_write:
6865         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
6866
6867         return emulator_write_emulated(ctxt, addr, new, bytes, exception);
6868 }
6869
6870 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
6871 {
6872         int r = 0, i;
6873
6874         for (i = 0; i < vcpu->arch.pio.count; i++) {
6875                 if (vcpu->arch.pio.in)
6876                         r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port,
6877                                             vcpu->arch.pio.size, pd);
6878                 else
6879                         r = kvm_io_bus_write(vcpu, KVM_PIO_BUS,
6880                                              vcpu->arch.pio.port, vcpu->arch.pio.size,
6881                                              pd);
6882                 if (r)
6883                         break;
6884                 pd += vcpu->arch.pio.size;
6885         }
6886         return r;
6887 }
6888
6889 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
6890                                unsigned short port, void *val,
6891                                unsigned int count, bool in)
6892 {
6893         vcpu->arch.pio.port = port;
6894         vcpu->arch.pio.in = in;
6895         vcpu->arch.pio.count  = count;
6896         vcpu->arch.pio.size = size;
6897
6898         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
6899                 vcpu->arch.pio.count = 0;
6900                 return 1;
6901         }
6902
6903         vcpu->run->exit_reason = KVM_EXIT_IO;
6904         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
6905         vcpu->run->io.size = size;
6906         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
6907         vcpu->run->io.count = count;
6908         vcpu->run->io.port = port;
6909
6910         return 0;
6911 }
6912
6913 static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
6914                            unsigned short port, void *val, unsigned int count)
6915 {
6916         int ret;
6917
6918         if (vcpu->arch.pio.count)
6919                 goto data_avail;
6920
6921         memset(vcpu->arch.pio_data, 0, size * count);
6922
6923         ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
6924         if (ret) {
6925 data_avail:
6926                 memcpy(val, vcpu->arch.pio_data, size * count);
6927                 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data);
6928                 vcpu->arch.pio.count = 0;
6929                 return 1;
6930         }
6931
6932         return 0;
6933 }
6934
6935 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
6936                                     int size, unsigned short port, void *val,
6937                                     unsigned int count)
6938 {
6939         return emulator_pio_in(emul_to_vcpu(ctxt), size, port, val, count);
6940
6941 }
6942
6943 static int emulator_pio_out(struct kvm_vcpu *vcpu, int size,
6944                             unsigned short port, const void *val,
6945                             unsigned int count)
6946 {
6947         memcpy(vcpu->arch.pio_data, val, size * count);
6948         trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data);
6949         return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
6950 }
6951
6952 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
6953                                      int size, unsigned short port,
6954                                      const void *val, unsigned int count)
6955 {
6956         return emulator_pio_out(emul_to_vcpu(ctxt), size, port, val, count);
6957 }
6958
6959 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
6960 {
6961         return static_call(kvm_x86_get_segment_base)(vcpu, seg);
6962 }
6963
6964 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
6965 {
6966         kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
6967 }
6968
6969 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu)
6970 {
6971         if (!need_emulate_wbinvd(vcpu))
6972                 return X86EMUL_CONTINUE;
6973
6974         if (static_call(kvm_x86_has_wbinvd_exit)()) {
6975                 int cpu = get_cpu();
6976
6977                 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
6978                 on_each_cpu_mask(vcpu->arch.wbinvd_dirty_mask,
6979                                 wbinvd_ipi, NULL, 1);
6980                 put_cpu();
6981                 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
6982         } else
6983                 wbinvd();
6984         return X86EMUL_CONTINUE;
6985 }
6986
6987 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
6988 {
6989         kvm_emulate_wbinvd_noskip(vcpu);
6990         return kvm_skip_emulated_instruction(vcpu);
6991 }
6992 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
6993
6994
6995
6996 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
6997 {
6998         kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt));
6999 }
7000
7001 static void emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
7002                             unsigned long *dest)
7003 {
7004         kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
7005 }
7006
7007 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
7008                            unsigned long value)
7009 {
7010
7011         return kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
7012 }
7013
7014 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
7015 {
7016         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
7017 }
7018
7019 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
7020 {
7021         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7022         unsigned long value;
7023
7024         switch (cr) {
7025         case 0:
7026                 value = kvm_read_cr0(vcpu);
7027                 break;
7028         case 2:
7029                 value = vcpu->arch.cr2;
7030                 break;
7031         case 3:
7032                 value = kvm_read_cr3(vcpu);
7033                 break;
7034         case 4:
7035                 value = kvm_read_cr4(vcpu);
7036                 break;
7037         case 8:
7038                 value = kvm_get_cr8(vcpu);
7039                 break;
7040         default:
7041                 kvm_err("%s: unexpected cr %u\n", __func__, cr);
7042                 return 0;
7043         }
7044
7045         return value;
7046 }
7047
7048 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
7049 {
7050         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7051         int res = 0;
7052
7053         switch (cr) {
7054         case 0:
7055                 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
7056                 break;
7057         case 2:
7058                 vcpu->arch.cr2 = val;
7059                 break;
7060         case 3:
7061                 res = kvm_set_cr3(vcpu, val);
7062                 break;
7063         case 4:
7064                 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
7065                 break;
7066         case 8:
7067                 res = kvm_set_cr8(vcpu, val);
7068                 break;
7069         default:
7070                 kvm_err("%s: unexpected cr %u\n", __func__, cr);
7071                 res = -1;
7072         }
7073
7074         return res;
7075 }
7076
7077 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
7078 {
7079         return static_call(kvm_x86_get_cpl)(emul_to_vcpu(ctxt));
7080 }
7081
7082 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7083 {
7084         static_call(kvm_x86_get_gdt)(emul_to_vcpu(ctxt), dt);
7085 }
7086
7087 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7088 {
7089         static_call(kvm_x86_get_idt)(emul_to_vcpu(ctxt), dt);
7090 }
7091
7092 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7093 {
7094         static_call(kvm_x86_set_gdt)(emul_to_vcpu(ctxt), dt);
7095 }
7096
7097 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7098 {
7099         static_call(kvm_x86_set_idt)(emul_to_vcpu(ctxt), dt);
7100 }
7101
7102 static unsigned long emulator_get_cached_segment_base(
7103         struct x86_emulate_ctxt *ctxt, int seg)
7104 {
7105         return get_segment_base(emul_to_vcpu(ctxt), seg);
7106 }
7107
7108 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
7109                                  struct desc_struct *desc, u32 *base3,
7110                                  int seg)
7111 {
7112         struct kvm_segment var;
7113
7114         kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
7115         *selector = var.selector;
7116
7117         if (var.unusable) {
7118                 memset(desc, 0, sizeof(*desc));
7119                 if (base3)
7120                         *base3 = 0;
7121                 return false;
7122         }
7123
7124         if (var.g)
7125                 var.limit >>= 12;
7126         set_desc_limit(desc, var.limit);
7127         set_desc_base(desc, (unsigned long)var.base);
7128 #ifdef CONFIG_X86_64
7129         if (base3)
7130                 *base3 = var.base >> 32;
7131 #endif
7132         desc->type = var.type;
7133         desc->s = var.s;
7134         desc->dpl = var.dpl;
7135         desc->p = var.present;
7136         desc->avl = var.avl;
7137         desc->l = var.l;
7138         desc->d = var.db;
7139         desc->g = var.g;
7140
7141         return true;
7142 }
7143
7144 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
7145                                  struct desc_struct *desc, u32 base3,
7146                                  int seg)
7147 {
7148         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7149         struct kvm_segment var;
7150
7151         var.selector = selector;
7152         var.base = get_desc_base(desc);
7153 #ifdef CONFIG_X86_64
7154         var.base |= ((u64)base3) << 32;
7155 #endif
7156         var.limit = get_desc_limit(desc);
7157         if (desc->g)
7158                 var.limit = (var.limit << 12) | 0xfff;
7159         var.type = desc->type;
7160         var.dpl = desc->dpl;
7161         var.db = desc->d;
7162         var.s = desc->s;
7163         var.l = desc->l;
7164         var.g = desc->g;
7165         var.avl = desc->avl;
7166         var.present = desc->p;
7167         var.unusable = !var.present;
7168         var.padding = 0;
7169
7170         kvm_set_segment(vcpu, &var, seg);
7171         return;
7172 }
7173
7174 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
7175                             u32 msr_index, u64 *pdata)
7176 {
7177         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7178         int r;
7179
7180         r = kvm_get_msr(vcpu, msr_index, pdata);
7181
7182         if (r && kvm_get_msr_user_space(vcpu, msr_index, r)) {
7183                 /* Bounce to user space */
7184                 return X86EMUL_IO_NEEDED;
7185         }
7186
7187         return r;
7188 }
7189
7190 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
7191                             u32 msr_index, u64 data)
7192 {
7193         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7194         int r;
7195
7196         r = kvm_set_msr(vcpu, msr_index, data);
7197
7198         if (r && kvm_set_msr_user_space(vcpu, msr_index, data, r)) {
7199                 /* Bounce to user space */
7200                 return X86EMUL_IO_NEEDED;
7201         }
7202
7203         return r;
7204 }
7205
7206 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt)
7207 {
7208         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7209
7210         return vcpu->arch.smbase;
7211 }
7212
7213 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase)
7214 {
7215         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7216
7217         vcpu->arch.smbase = smbase;
7218 }
7219
7220 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt,
7221                               u32 pmc)
7222 {
7223         return kvm_pmu_is_valid_rdpmc_ecx(emul_to_vcpu(ctxt), pmc);
7224 }
7225
7226 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
7227                              u32 pmc, u64 *pdata)
7228 {
7229         return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata);
7230 }
7231
7232 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
7233 {
7234         emul_to_vcpu(ctxt)->arch.halt_request = 1;
7235 }
7236
7237 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
7238                               struct x86_instruction_info *info,
7239                               enum x86_intercept_stage stage)
7240 {
7241         return static_call(kvm_x86_check_intercept)(emul_to_vcpu(ctxt), info, stage,
7242                                             &ctxt->exception);
7243 }
7244
7245 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
7246                               u32 *eax, u32 *ebx, u32 *ecx, u32 *edx,
7247                               bool exact_only)
7248 {
7249         return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, exact_only);
7250 }
7251
7252 static bool emulator_guest_has_long_mode(struct x86_emulate_ctxt *ctxt)
7253 {
7254         return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_LM);
7255 }
7256
7257 static bool emulator_guest_has_movbe(struct x86_emulate_ctxt *ctxt)
7258 {
7259         return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_MOVBE);
7260 }
7261
7262 static bool emulator_guest_has_fxsr(struct x86_emulate_ctxt *ctxt)
7263 {
7264         return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_FXSR);
7265 }
7266
7267 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
7268 {
7269         return kvm_register_read_raw(emul_to_vcpu(ctxt), reg);
7270 }
7271
7272 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
7273 {
7274         kvm_register_write_raw(emul_to_vcpu(ctxt), reg, val);
7275 }
7276
7277 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
7278 {
7279         static_call(kvm_x86_set_nmi_mask)(emul_to_vcpu(ctxt), masked);
7280 }
7281
7282 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
7283 {
7284         return emul_to_vcpu(ctxt)->arch.hflags;
7285 }
7286
7287 static void emulator_exiting_smm(struct x86_emulate_ctxt *ctxt)
7288 {
7289         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7290
7291         kvm_smm_changed(vcpu, false);
7292 }
7293
7294 static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt,
7295                                   const char *smstate)
7296 {
7297         return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smstate);
7298 }
7299
7300 static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt)
7301 {
7302         kvm_make_request(KVM_REQ_TRIPLE_FAULT, emul_to_vcpu(ctxt));
7303 }
7304
7305 static int emulator_set_xcr(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr)
7306 {
7307         return __kvm_set_xcr(emul_to_vcpu(ctxt), index, xcr);
7308 }
7309
7310 static const struct x86_emulate_ops emulate_ops = {
7311         .read_gpr            = emulator_read_gpr,
7312         .write_gpr           = emulator_write_gpr,
7313         .read_std            = emulator_read_std,
7314         .write_std           = emulator_write_std,
7315         .read_phys           = kvm_read_guest_phys_system,
7316         .fetch               = kvm_fetch_guest_virt,
7317         .read_emulated       = emulator_read_emulated,
7318         .write_emulated      = emulator_write_emulated,
7319         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
7320         .invlpg              = emulator_invlpg,
7321         .pio_in_emulated     = emulator_pio_in_emulated,
7322         .pio_out_emulated    = emulator_pio_out_emulated,
7323         .get_segment         = emulator_get_segment,
7324         .set_segment         = emulator_set_segment,
7325         .get_cached_segment_base = emulator_get_cached_segment_base,
7326         .get_gdt             = emulator_get_gdt,
7327         .get_idt             = emulator_get_idt,
7328         .set_gdt             = emulator_set_gdt,
7329         .set_idt             = emulator_set_idt,
7330         .get_cr              = emulator_get_cr,
7331         .set_cr              = emulator_set_cr,
7332         .cpl                 = emulator_get_cpl,
7333         .get_dr              = emulator_get_dr,
7334         .set_dr              = emulator_set_dr,
7335         .get_smbase          = emulator_get_smbase,
7336         .set_smbase          = emulator_set_smbase,
7337         .set_msr             = emulator_set_msr,
7338         .get_msr             = emulator_get_msr,
7339         .check_pmc           = emulator_check_pmc,
7340         .read_pmc            = emulator_read_pmc,
7341         .halt                = emulator_halt,
7342         .wbinvd              = emulator_wbinvd,
7343         .fix_hypercall       = emulator_fix_hypercall,
7344         .intercept           = emulator_intercept,
7345         .get_cpuid           = emulator_get_cpuid,
7346         .guest_has_long_mode = emulator_guest_has_long_mode,
7347         .guest_has_movbe     = emulator_guest_has_movbe,
7348         .guest_has_fxsr      = emulator_guest_has_fxsr,
7349         .set_nmi_mask        = emulator_set_nmi_mask,
7350         .get_hflags          = emulator_get_hflags,
7351         .exiting_smm         = emulator_exiting_smm,
7352         .leave_smm           = emulator_leave_smm,
7353         .triple_fault        = emulator_triple_fault,
7354         .set_xcr             = emulator_set_xcr,
7355 };
7356
7357 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
7358 {
7359         u32 int_shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
7360         /*
7361          * an sti; sti; sequence only disable interrupts for the first
7362          * instruction. So, if the last instruction, be it emulated or
7363          * not, left the system with the INT_STI flag enabled, it
7364          * means that the last instruction is an sti. We should not
7365          * leave the flag on in this case. The same goes for mov ss
7366          */
7367         if (int_shadow & mask)
7368                 mask = 0;
7369         if (unlikely(int_shadow || mask)) {
7370                 static_call(kvm_x86_set_interrupt_shadow)(vcpu, mask);
7371                 if (!mask)
7372                         kvm_make_request(KVM_REQ_EVENT, vcpu);
7373         }
7374 }
7375
7376 static bool inject_emulated_exception(struct kvm_vcpu *vcpu)
7377 {
7378         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7379         if (ctxt->exception.vector == PF_VECTOR)
7380                 return kvm_inject_emulated_page_fault(vcpu, &ctxt->exception);
7381
7382         if (ctxt->exception.error_code_valid)
7383                 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
7384                                       ctxt->exception.error_code);
7385         else
7386                 kvm_queue_exception(vcpu, ctxt->exception.vector);
7387         return false;
7388 }
7389
7390 static struct x86_emulate_ctxt *alloc_emulate_ctxt(struct kvm_vcpu *vcpu)
7391 {
7392         struct x86_emulate_ctxt *ctxt;
7393
7394         ctxt = kmem_cache_zalloc(x86_emulator_cache, GFP_KERNEL_ACCOUNT);
7395         if (!ctxt) {
7396                 pr_err("kvm: failed to allocate vcpu's emulator\n");
7397                 return NULL;
7398         }
7399
7400         ctxt->vcpu = vcpu;
7401         ctxt->ops = &emulate_ops;
7402         vcpu->arch.emulate_ctxt = ctxt;
7403
7404         return ctxt;
7405 }
7406
7407 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
7408 {
7409         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7410         int cs_db, cs_l;
7411
7412         static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l);
7413
7414         ctxt->gpa_available = false;
7415         ctxt->eflags = kvm_get_rflags(vcpu);
7416         ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
7417
7418         ctxt->eip = kvm_rip_read(vcpu);
7419         ctxt->mode = (!is_protmode(vcpu))               ? X86EMUL_MODE_REAL :
7420                      (ctxt->eflags & X86_EFLAGS_VM)     ? X86EMUL_MODE_VM86 :
7421                      (cs_l && is_long_mode(vcpu))       ? X86EMUL_MODE_PROT64 :
7422                      cs_db                              ? X86EMUL_MODE_PROT32 :
7423                                                           X86EMUL_MODE_PROT16;
7424         BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK);
7425         BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK);
7426         BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK);
7427
7428         ctxt->interruptibility = 0;
7429         ctxt->have_exception = false;
7430         ctxt->exception.vector = -1;
7431         ctxt->perm_ok = false;
7432
7433         init_decode_cache(ctxt);
7434         vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
7435 }
7436
7437 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
7438 {
7439         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7440         int ret;
7441
7442         init_emulate_ctxt(vcpu);
7443
7444         ctxt->op_bytes = 2;
7445         ctxt->ad_bytes = 2;
7446         ctxt->_eip = ctxt->eip + inc_eip;
7447         ret = emulate_int_real(ctxt, irq);
7448
7449         if (ret != X86EMUL_CONTINUE) {
7450                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
7451         } else {
7452                 ctxt->eip = ctxt->_eip;
7453                 kvm_rip_write(vcpu, ctxt->eip);
7454                 kvm_set_rflags(vcpu, ctxt->eflags);
7455         }
7456 }
7457 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
7458
7459 static void prepare_emulation_failure_exit(struct kvm_vcpu *vcpu)
7460 {
7461         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7462         u32 insn_size = ctxt->fetch.end - ctxt->fetch.data;
7463         struct kvm_run *run = vcpu->run;
7464
7465         run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
7466         run->emulation_failure.suberror = KVM_INTERNAL_ERROR_EMULATION;
7467         run->emulation_failure.ndata = 0;
7468         run->emulation_failure.flags = 0;
7469
7470         if (insn_size) {
7471                 run->emulation_failure.ndata = 3;
7472                 run->emulation_failure.flags |=
7473                         KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES;
7474                 run->emulation_failure.insn_size = insn_size;
7475                 memset(run->emulation_failure.insn_bytes, 0x90,
7476                        sizeof(run->emulation_failure.insn_bytes));
7477                 memcpy(run->emulation_failure.insn_bytes,
7478                        ctxt->fetch.data, insn_size);
7479         }
7480 }
7481
7482 static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type)
7483 {
7484         struct kvm *kvm = vcpu->kvm;
7485
7486         ++vcpu->stat.insn_emulation_fail;
7487         trace_kvm_emulate_insn_failed(vcpu);
7488
7489         if (emulation_type & EMULTYPE_VMWARE_GP) {
7490                 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
7491                 return 1;
7492         }
7493
7494         if (kvm->arch.exit_on_emulation_error ||
7495             (emulation_type & EMULTYPE_SKIP)) {
7496                 prepare_emulation_failure_exit(vcpu);
7497                 return 0;
7498         }
7499
7500         kvm_queue_exception(vcpu, UD_VECTOR);
7501
7502         if (!is_guest_mode(vcpu) && static_call(kvm_x86_get_cpl)(vcpu) == 0) {
7503                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
7504                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
7505                 vcpu->run->internal.ndata = 0;
7506                 return 0;
7507         }
7508
7509         return 1;
7510 }
7511
7512 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
7513                                   bool write_fault_to_shadow_pgtable,
7514                                   int emulation_type)
7515 {
7516         gpa_t gpa = cr2_or_gpa;
7517         kvm_pfn_t pfn;
7518
7519         if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
7520                 return false;
7521
7522         if (WARN_ON_ONCE(is_guest_mode(vcpu)) ||
7523             WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF)))
7524                 return false;
7525
7526         if (!vcpu->arch.mmu->direct_map) {
7527                 /*
7528                  * Write permission should be allowed since only
7529                  * write access need to be emulated.
7530                  */
7531                 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL);
7532
7533                 /*
7534                  * If the mapping is invalid in guest, let cpu retry
7535                  * it to generate fault.
7536                  */
7537                 if (gpa == UNMAPPED_GVA)
7538                         return true;
7539         }
7540
7541         /*
7542          * Do not retry the unhandleable instruction if it faults on the
7543          * readonly host memory, otherwise it will goto a infinite loop:
7544          * retry instruction -> write #PF -> emulation fail -> retry
7545          * instruction -> ...
7546          */
7547         pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
7548
7549         /*
7550          * If the instruction failed on the error pfn, it can not be fixed,
7551          * report the error to userspace.
7552          */
7553         if (is_error_noslot_pfn(pfn))
7554                 return false;
7555
7556         kvm_release_pfn_clean(pfn);
7557
7558         /* The instructions are well-emulated on direct mmu. */
7559         if (vcpu->arch.mmu->direct_map) {
7560                 unsigned int indirect_shadow_pages;
7561
7562                 write_lock(&vcpu->kvm->mmu_lock);
7563                 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
7564                 write_unlock(&vcpu->kvm->mmu_lock);
7565
7566                 if (indirect_shadow_pages)
7567                         kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
7568
7569                 return true;
7570         }
7571
7572         /*
7573          * if emulation was due to access to shadowed page table
7574          * and it failed try to unshadow page and re-enter the
7575          * guest to let CPU execute the instruction.
7576          */
7577         kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
7578
7579         /*
7580          * If the access faults on its page table, it can not
7581          * be fixed by unprotecting shadow page and it should
7582          * be reported to userspace.
7583          */
7584         return !write_fault_to_shadow_pgtable;
7585 }
7586
7587 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
7588                               gpa_t cr2_or_gpa,  int emulation_type)
7589 {
7590         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7591         unsigned long last_retry_eip, last_retry_addr, gpa = cr2_or_gpa;
7592
7593         last_retry_eip = vcpu->arch.last_retry_eip;
7594         last_retry_addr = vcpu->arch.last_retry_addr;
7595
7596         /*
7597          * If the emulation is caused by #PF and it is non-page_table
7598          * writing instruction, it means the VM-EXIT is caused by shadow
7599          * page protected, we can zap the shadow page and retry this
7600          * instruction directly.
7601          *
7602          * Note: if the guest uses a non-page-table modifying instruction
7603          * on the PDE that points to the instruction, then we will unmap
7604          * the instruction and go to an infinite loop. So, we cache the
7605          * last retried eip and the last fault address, if we meet the eip
7606          * and the address again, we can break out of the potential infinite
7607          * loop.
7608          */
7609         vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
7610
7611         if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
7612                 return false;
7613
7614         if (WARN_ON_ONCE(is_guest_mode(vcpu)) ||
7615             WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF)))
7616                 return false;
7617
7618         if (x86_page_table_writing_insn(ctxt))
7619                 return false;
7620
7621         if (ctxt->eip == last_retry_eip && last_retry_addr == cr2_or_gpa)
7622                 return false;
7623
7624         vcpu->arch.last_retry_eip = ctxt->eip;
7625         vcpu->arch.last_retry_addr = cr2_or_gpa;
7626
7627         if (!vcpu->arch.mmu->direct_map)
7628                 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL);
7629
7630         kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
7631
7632         return true;
7633 }
7634
7635 static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
7636 static int complete_emulated_pio(struct kvm_vcpu *vcpu);
7637
7638 static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
7639 {
7640         trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
7641
7642         if (entering_smm) {
7643                 vcpu->arch.hflags |= HF_SMM_MASK;
7644         } else {
7645                 vcpu->arch.hflags &= ~(HF_SMM_MASK | HF_SMM_INSIDE_NMI_MASK);
7646
7647                 /* Process a latched INIT or SMI, if any.  */
7648                 kvm_make_request(KVM_REQ_EVENT, vcpu);
7649         }
7650
7651         kvm_mmu_reset_context(vcpu);
7652 }
7653
7654 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
7655                                 unsigned long *db)
7656 {
7657         u32 dr6 = 0;
7658         int i;
7659         u32 enable, rwlen;
7660
7661         enable = dr7;
7662         rwlen = dr7 >> 16;
7663         for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4)
7664                 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr)
7665                         dr6 |= (1 << i);
7666         return dr6;
7667 }
7668
7669 static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu)
7670 {
7671         struct kvm_run *kvm_run = vcpu->run;
7672
7673         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
7674                 kvm_run->debug.arch.dr6 = DR6_BS | DR6_ACTIVE_LOW;
7675                 kvm_run->debug.arch.pc = kvm_get_linear_rip(vcpu);
7676                 kvm_run->debug.arch.exception = DB_VECTOR;
7677                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
7678                 return 0;
7679         }
7680         kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS);
7681         return 1;
7682 }
7683
7684 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
7685 {
7686         unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu);
7687         int r;
7688
7689         r = static_call(kvm_x86_skip_emulated_instruction)(vcpu);
7690         if (unlikely(!r))
7691                 return 0;
7692
7693         /*
7694          * rflags is the old, "raw" value of the flags.  The new value has
7695          * not been saved yet.
7696          *
7697          * This is correct even for TF set by the guest, because "the
7698          * processor will not generate this exception after the instruction
7699          * that sets the TF flag".
7700          */
7701         if (unlikely(rflags & X86_EFLAGS_TF))
7702                 r = kvm_vcpu_do_singlestep(vcpu);
7703         return r;
7704 }
7705 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction);
7706
7707 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)
7708 {
7709         if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
7710             (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) {
7711                 struct kvm_run *kvm_run = vcpu->run;
7712                 unsigned long eip = kvm_get_linear_rip(vcpu);
7713                 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
7714                                            vcpu->arch.guest_debug_dr7,
7715                                            vcpu->arch.eff_db);
7716
7717                 if (dr6 != 0) {
7718                         kvm_run->debug.arch.dr6 = dr6 | DR6_ACTIVE_LOW;
7719                         kvm_run->debug.arch.pc = eip;
7720                         kvm_run->debug.arch.exception = DB_VECTOR;
7721                         kvm_run->exit_reason = KVM_EXIT_DEBUG;
7722                         *r = 0;
7723                         return true;
7724                 }
7725         }
7726
7727         if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) &&
7728             !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) {
7729                 unsigned long eip = kvm_get_linear_rip(vcpu);
7730                 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
7731                                            vcpu->arch.dr7,
7732                                            vcpu->arch.db);
7733
7734                 if (dr6 != 0) {
7735                         kvm_queue_exception_p(vcpu, DB_VECTOR, dr6);
7736                         *r = 1;
7737                         return true;
7738                 }
7739         }
7740
7741         return false;
7742 }
7743
7744 static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt)
7745 {
7746         switch (ctxt->opcode_len) {
7747         case 1:
7748                 switch (ctxt->b) {
7749                 case 0xe4:      /* IN */
7750                 case 0xe5:
7751                 case 0xec:
7752                 case 0xed:
7753                 case 0xe6:      /* OUT */
7754                 case 0xe7:
7755                 case 0xee:
7756                 case 0xef:
7757                 case 0x6c:      /* INS */
7758                 case 0x6d:
7759                 case 0x6e:      /* OUTS */
7760                 case 0x6f:
7761                         return true;
7762                 }
7763                 break;
7764         case 2:
7765                 switch (ctxt->b) {
7766                 case 0x33:      /* RDPMC */
7767                         return true;
7768                 }
7769                 break;
7770         }
7771
7772         return false;
7773 }
7774
7775 /*
7776  * Decode to be emulated instruction. Return EMULATION_OK if success.
7777  */
7778 int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
7779                                     void *insn, int insn_len)
7780 {
7781         int r = EMULATION_OK;
7782         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7783
7784         init_emulate_ctxt(vcpu);
7785
7786         /*
7787          * We will reenter on the same instruction since we do not set
7788          * complete_userspace_io. This does not handle watchpoints yet,
7789          * those would be handled in the emulate_ops.
7790          */
7791         if (!(emulation_type & EMULTYPE_SKIP) &&
7792             kvm_vcpu_check_breakpoint(vcpu, &r))
7793                 return r;
7794
7795         r = x86_decode_insn(ctxt, insn, insn_len, emulation_type);
7796
7797         trace_kvm_emulate_insn_start(vcpu);
7798         ++vcpu->stat.insn_emulation;
7799
7800         return r;
7801 }
7802 EXPORT_SYMBOL_GPL(x86_decode_emulated_instruction);
7803
7804 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
7805                             int emulation_type, void *insn, int insn_len)
7806 {
7807         int r;
7808         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7809         bool writeback = true;
7810         bool write_fault_to_spt;
7811
7812         if (unlikely(!static_call(kvm_x86_can_emulate_instruction)(vcpu, insn, insn_len)))
7813                 return 1;
7814
7815         vcpu->arch.l1tf_flush_l1d = true;
7816
7817         /*
7818          * Clear write_fault_to_shadow_pgtable here to ensure it is
7819          * never reused.
7820          */
7821         write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
7822         vcpu->arch.write_fault_to_shadow_pgtable = false;
7823
7824         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
7825                 kvm_clear_exception_queue(vcpu);
7826
7827                 r = x86_decode_emulated_instruction(vcpu, emulation_type,
7828                                                     insn, insn_len);
7829                 if (r != EMULATION_OK)  {
7830                         if ((emulation_type & EMULTYPE_TRAP_UD) ||
7831                             (emulation_type & EMULTYPE_TRAP_UD_FORCED)) {
7832                                 kvm_queue_exception(vcpu, UD_VECTOR);
7833                                 return 1;
7834                         }
7835                         if (reexecute_instruction(vcpu, cr2_or_gpa,
7836                                                   write_fault_to_spt,
7837                                                   emulation_type))
7838                                 return 1;
7839                         if (ctxt->have_exception) {
7840                                 /*
7841                                  * #UD should result in just EMULATION_FAILED, and trap-like
7842                                  * exception should not be encountered during decode.
7843                                  */
7844                                 WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR ||
7845                                              exception_type(ctxt->exception.vector) == EXCPT_TRAP);
7846                                 inject_emulated_exception(vcpu);
7847                                 return 1;
7848                         }
7849                         return handle_emulation_failure(vcpu, emulation_type);
7850                 }
7851         }
7852
7853         if ((emulation_type & EMULTYPE_VMWARE_GP) &&
7854             !is_vmware_backdoor_opcode(ctxt)) {
7855                 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
7856                 return 1;
7857         }
7858
7859         /*
7860          * Note, EMULTYPE_SKIP is intended for use *only* by vendor callbacks
7861          * for kvm_skip_emulated_instruction().  The caller is responsible for
7862          * updating interruptibility state and injecting single-step #DBs.
7863          */
7864         if (emulation_type & EMULTYPE_SKIP) {
7865                 kvm_rip_write(vcpu, ctxt->_eip);
7866                 if (ctxt->eflags & X86_EFLAGS_RF)
7867                         kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
7868                 return 1;
7869         }
7870
7871         if (retry_instruction(ctxt, cr2_or_gpa, emulation_type))
7872                 return 1;
7873
7874         /* this is needed for vmware backdoor interface to work since it
7875            changes registers values  during IO operation */
7876         if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
7877                 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
7878                 emulator_invalidate_register_cache(ctxt);
7879         }
7880
7881 restart:
7882         if (emulation_type & EMULTYPE_PF) {
7883                 /* Save the faulting GPA (cr2) in the address field */
7884                 ctxt->exception.address = cr2_or_gpa;
7885
7886                 /* With shadow page tables, cr2 contains a GVA or nGPA. */
7887                 if (vcpu->arch.mmu->direct_map) {
7888                         ctxt->gpa_available = true;
7889                         ctxt->gpa_val = cr2_or_gpa;
7890                 }
7891         } else {
7892                 /* Sanitize the address out of an abundance of paranoia. */
7893                 ctxt->exception.address = 0;
7894         }
7895
7896         r = x86_emulate_insn(ctxt);
7897
7898         if (r == EMULATION_INTERCEPTED)
7899                 return 1;
7900
7901         if (r == EMULATION_FAILED) {
7902                 if (reexecute_instruction(vcpu, cr2_or_gpa, write_fault_to_spt,
7903                                         emulation_type))
7904                         return 1;
7905
7906                 return handle_emulation_failure(vcpu, emulation_type);
7907         }
7908
7909         if (ctxt->have_exception) {
7910                 r = 1;
7911                 if (inject_emulated_exception(vcpu))
7912                         return r;
7913         } else if (vcpu->arch.pio.count) {
7914                 if (!vcpu->arch.pio.in) {
7915                         /* FIXME: return into emulator if single-stepping.  */
7916                         vcpu->arch.pio.count = 0;
7917                 } else {
7918                         writeback = false;
7919                         vcpu->arch.complete_userspace_io = complete_emulated_pio;
7920                 }
7921                 r = 0;
7922         } else if (vcpu->mmio_needed) {
7923                 ++vcpu->stat.mmio_exits;
7924
7925                 if (!vcpu->mmio_is_write)
7926                         writeback = false;
7927                 r = 0;
7928                 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
7929         } else if (r == EMULATION_RESTART)
7930                 goto restart;
7931         else
7932                 r = 1;
7933
7934         if (writeback) {
7935                 unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu);
7936                 toggle_interruptibility(vcpu, ctxt->interruptibility);
7937                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
7938                 if (!ctxt->have_exception ||
7939                     exception_type(ctxt->exception.vector) == EXCPT_TRAP) {
7940                         kvm_rip_write(vcpu, ctxt->eip);
7941                         if (r && (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)))
7942                                 r = kvm_vcpu_do_singlestep(vcpu);
7943                         if (kvm_x86_ops.update_emulated_instruction)
7944                                 static_call(kvm_x86_update_emulated_instruction)(vcpu);
7945                         __kvm_set_rflags(vcpu, ctxt->eflags);
7946                 }
7947
7948                 /*
7949                  * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
7950                  * do nothing, and it will be requested again as soon as
7951                  * the shadow expires.  But we still need to check here,
7952                  * because POPF has no interrupt shadow.
7953                  */
7954                 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF))
7955                         kvm_make_request(KVM_REQ_EVENT, vcpu);
7956         } else
7957                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
7958
7959         return r;
7960 }
7961
7962 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type)
7963 {
7964         return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0);
7965 }
7966 EXPORT_SYMBOL_GPL(kvm_emulate_instruction);
7967
7968 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
7969                                         void *insn, int insn_len)
7970 {
7971         return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len);
7972 }
7973 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer);
7974
7975 static int complete_fast_pio_out_port_0x7e(struct kvm_vcpu *vcpu)
7976 {
7977         vcpu->arch.pio.count = 0;
7978         return 1;
7979 }
7980
7981 static int complete_fast_pio_out(struct kvm_vcpu *vcpu)
7982 {
7983         vcpu->arch.pio.count = 0;
7984
7985         if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip)))
7986                 return 1;
7987
7988         return kvm_skip_emulated_instruction(vcpu);
7989 }
7990
7991 static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size,
7992                             unsigned short port)
7993 {
7994         unsigned long val = kvm_rax_read(vcpu);
7995         int ret = emulator_pio_out(vcpu, size, port, &val, 1);
7996
7997         if (ret)
7998                 return ret;
7999
8000         /*
8001          * Workaround userspace that relies on old KVM behavior of %rip being
8002          * incremented prior to exiting to userspace to handle "OUT 0x7e".
8003          */
8004         if (port == 0x7e &&
8005             kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_OUT_7E_INC_RIP)) {
8006                 vcpu->arch.complete_userspace_io =
8007                         complete_fast_pio_out_port_0x7e;
8008                 kvm_skip_emulated_instruction(vcpu);
8009         } else {
8010                 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
8011                 vcpu->arch.complete_userspace_io = complete_fast_pio_out;
8012         }
8013         return 0;
8014 }
8015
8016 static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
8017 {
8018         unsigned long val;
8019
8020         /* We should only ever be called with arch.pio.count equal to 1 */
8021         BUG_ON(vcpu->arch.pio.count != 1);
8022
8023         if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) {
8024                 vcpu->arch.pio.count = 0;
8025                 return 1;
8026         }
8027
8028         /* For size less than 4 we merge, else we zero extend */
8029         val = (vcpu->arch.pio.size < 4) ? kvm_rax_read(vcpu) : 0;
8030
8031         /*
8032          * Since vcpu->arch.pio.count == 1 let emulator_pio_in perform
8033          * the copy and tracing
8034          */
8035         emulator_pio_in(vcpu, vcpu->arch.pio.size, vcpu->arch.pio.port, &val, 1);
8036         kvm_rax_write(vcpu, val);
8037
8038         return kvm_skip_emulated_instruction(vcpu);
8039 }
8040
8041 static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
8042                            unsigned short port)
8043 {
8044         unsigned long val;
8045         int ret;
8046
8047         /* For size less than 4 we merge, else we zero extend */
8048         val = (size < 4) ? kvm_rax_read(vcpu) : 0;
8049
8050         ret = emulator_pio_in(vcpu, size, port, &val, 1);
8051         if (ret) {
8052                 kvm_rax_write(vcpu, val);
8053                 return ret;
8054         }
8055
8056         vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
8057         vcpu->arch.complete_userspace_io = complete_fast_pio_in;
8058
8059         return 0;
8060 }
8061
8062 int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in)
8063 {
8064         int ret;
8065
8066         if (in)
8067                 ret = kvm_fast_pio_in(vcpu, size, port);
8068         else
8069                 ret = kvm_fast_pio_out(vcpu, size, port);
8070         return ret && kvm_skip_emulated_instruction(vcpu);
8071 }
8072 EXPORT_SYMBOL_GPL(kvm_fast_pio);
8073
8074 static int kvmclock_cpu_down_prep(unsigned int cpu)
8075 {
8076         __this_cpu_write(cpu_tsc_khz, 0);
8077         return 0;
8078 }
8079
8080 static void tsc_khz_changed(void *data)
8081 {
8082         struct cpufreq_freqs *freq = data;
8083         unsigned long khz = 0;
8084
8085         if (data)
8086                 khz = freq->new;
8087         else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
8088                 khz = cpufreq_quick_get(raw_smp_processor_id());
8089         if (!khz)
8090                 khz = tsc_khz;
8091         __this_cpu_write(cpu_tsc_khz, khz);
8092 }
8093
8094 #ifdef CONFIG_X86_64
8095 static void kvm_hyperv_tsc_notifier(void)
8096 {
8097         struct kvm *kvm;
8098         struct kvm_vcpu *vcpu;
8099         int cpu;
8100         unsigned long flags;
8101
8102         mutex_lock(&kvm_lock);
8103         list_for_each_entry(kvm, &vm_list, vm_list)
8104                 kvm_make_mclock_inprogress_request(kvm);
8105
8106         hyperv_stop_tsc_emulation();
8107
8108         /* TSC frequency always matches when on Hyper-V */
8109         for_each_present_cpu(cpu)
8110                 per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
8111         kvm_max_guest_tsc_khz = tsc_khz;
8112
8113         list_for_each_entry(kvm, &vm_list, vm_list) {
8114                 struct kvm_arch *ka = &kvm->arch;
8115
8116                 spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
8117                 pvclock_update_vm_gtod_copy(kvm);
8118                 spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
8119
8120                 kvm_for_each_vcpu(cpu, vcpu, kvm)
8121                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
8122
8123                 kvm_for_each_vcpu(cpu, vcpu, kvm)
8124                         kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
8125         }
8126         mutex_unlock(&kvm_lock);
8127 }
8128 #endif
8129
8130 static void __kvmclock_cpufreq_notifier(struct cpufreq_freqs *freq, int cpu)
8131 {
8132         struct kvm *kvm;
8133         struct kvm_vcpu *vcpu;
8134         int i, send_ipi = 0;
8135
8136         /*
8137          * We allow guests to temporarily run on slowing clocks,
8138          * provided we notify them after, or to run on accelerating
8139          * clocks, provided we notify them before.  Thus time never
8140          * goes backwards.
8141          *
8142          * However, we have a problem.  We can't atomically update
8143          * the frequency of a given CPU from this function; it is
8144          * merely a notifier, which can be called from any CPU.
8145          * Changing the TSC frequency at arbitrary points in time
8146          * requires a recomputation of local variables related to
8147          * the TSC for each VCPU.  We must flag these local variables
8148          * to be updated and be sure the update takes place with the
8149          * new frequency before any guests proceed.
8150          *
8151          * Unfortunately, the combination of hotplug CPU and frequency
8152          * change creates an intractable locking scenario; the order
8153          * of when these callouts happen is undefined with respect to
8154          * CPU hotplug, and they can race with each other.  As such,
8155          * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
8156          * undefined; you can actually have a CPU frequency change take
8157          * place in between the computation of X and the setting of the
8158          * variable.  To protect against this problem, all updates of
8159          * the per_cpu tsc_khz variable are done in an interrupt
8160          * protected IPI, and all callers wishing to update the value
8161          * must wait for a synchronous IPI to complete (which is trivial
8162          * if the caller is on the CPU already).  This establishes the
8163          * necessary total order on variable updates.
8164          *
8165          * Note that because a guest time update may take place
8166          * anytime after the setting of the VCPU's request bit, the
8167          * correct TSC value must be set before the request.  However,
8168          * to ensure the update actually makes it to any guest which
8169          * starts running in hardware virtualization between the set
8170          * and the acquisition of the spinlock, we must also ping the
8171          * CPU after setting the request bit.
8172          *
8173          */
8174
8175         smp_call_function_single(cpu, tsc_khz_changed, freq, 1);
8176
8177         mutex_lock(&kvm_lock);
8178         list_for_each_entry(kvm, &vm_list, vm_list) {
8179                 kvm_for_each_vcpu(i, vcpu, kvm) {
8180                         if (vcpu->cpu != cpu)
8181                                 continue;
8182                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
8183                         if (vcpu->cpu != raw_smp_processor_id())
8184                                 send_ipi = 1;
8185                 }
8186         }
8187         mutex_unlock(&kvm_lock);
8188
8189         if (freq->old < freq->new && send_ipi) {
8190                 /*
8191                  * We upscale the frequency.  Must make the guest
8192                  * doesn't see old kvmclock values while running with
8193                  * the new frequency, otherwise we risk the guest sees
8194                  * time go backwards.
8195                  *
8196                  * In case we update the frequency for another cpu
8197                  * (which might be in guest context) send an interrupt
8198                  * to kick the cpu out of guest context.  Next time
8199                  * guest context is entered kvmclock will be updated,
8200                  * so the guest will not see stale values.
8201                  */
8202                 smp_call_function_single(cpu, tsc_khz_changed, freq, 1);
8203         }
8204 }
8205
8206 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
8207                                      void *data)
8208 {
8209         struct cpufreq_freqs *freq = data;
8210         int cpu;
8211
8212         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
8213                 return 0;
8214         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
8215                 return 0;
8216
8217         for_each_cpu(cpu, freq->policy->cpus)
8218                 __kvmclock_cpufreq_notifier(freq, cpu);
8219
8220         return 0;
8221 }
8222
8223 static struct notifier_block kvmclock_cpufreq_notifier_block = {
8224         .notifier_call  = kvmclock_cpufreq_notifier
8225 };
8226
8227 static int kvmclock_cpu_online(unsigned int cpu)
8228 {
8229         tsc_khz_changed(NULL);
8230         return 0;
8231 }
8232
8233 static void kvm_timer_init(void)
8234 {
8235         max_tsc_khz = tsc_khz;
8236
8237         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
8238 #ifdef CONFIG_CPU_FREQ
8239                 struct cpufreq_policy *policy;
8240                 int cpu;
8241
8242                 cpu = get_cpu();
8243                 policy = cpufreq_cpu_get(cpu);
8244                 if (policy) {
8245                         if (policy->cpuinfo.max_freq)
8246                                 max_tsc_khz = policy->cpuinfo.max_freq;
8247                         cpufreq_cpu_put(policy);
8248                 }
8249                 put_cpu();
8250 #endif
8251                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
8252                                           CPUFREQ_TRANSITION_NOTIFIER);
8253         }
8254
8255         cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online",
8256                           kvmclock_cpu_online, kvmclock_cpu_down_prep);
8257 }
8258
8259 DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
8260 EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu);
8261
8262 int kvm_is_in_guest(void)
8263 {
8264         return __this_cpu_read(current_vcpu) != NULL;
8265 }
8266
8267 static int kvm_is_user_mode(void)
8268 {
8269         int user_mode = 3;
8270
8271         if (__this_cpu_read(current_vcpu))
8272                 user_mode = static_call(kvm_x86_get_cpl)(__this_cpu_read(current_vcpu));
8273
8274         return user_mode != 0;
8275 }
8276
8277 static unsigned long kvm_get_guest_ip(void)
8278 {
8279         unsigned long ip = 0;
8280
8281         if (__this_cpu_read(current_vcpu))
8282                 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
8283
8284         return ip;
8285 }
8286
8287 static void kvm_handle_intel_pt_intr(void)
8288 {
8289         struct kvm_vcpu *vcpu = __this_cpu_read(current_vcpu);
8290
8291         kvm_make_request(KVM_REQ_PMI, vcpu);
8292         __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT,
8293                         (unsigned long *)&vcpu->arch.pmu.global_status);
8294 }
8295
8296 static struct perf_guest_info_callbacks kvm_guest_cbs = {
8297         .is_in_guest            = kvm_is_in_guest,
8298         .is_user_mode           = kvm_is_user_mode,
8299         .get_guest_ip           = kvm_get_guest_ip,
8300         .handle_intel_pt_intr   = kvm_handle_intel_pt_intr,
8301 };
8302
8303 #ifdef CONFIG_X86_64
8304 static void pvclock_gtod_update_fn(struct work_struct *work)
8305 {
8306         struct kvm *kvm;
8307
8308         struct kvm_vcpu *vcpu;
8309         int i;
8310
8311         mutex_lock(&kvm_lock);
8312         list_for_each_entry(kvm, &vm_list, vm_list)
8313                 kvm_for_each_vcpu(i, vcpu, kvm)
8314                         kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
8315         atomic_set(&kvm_guest_has_master_clock, 0);
8316         mutex_unlock(&kvm_lock);
8317 }
8318
8319 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn);
8320
8321 /*
8322  * Indirection to move queue_work() out of the tk_core.seq write held
8323  * region to prevent possible deadlocks against time accessors which
8324  * are invoked with work related locks held.
8325  */
8326 static void pvclock_irq_work_fn(struct irq_work *w)
8327 {
8328         queue_work(system_long_wq, &pvclock_gtod_work);
8329 }
8330
8331 static DEFINE_IRQ_WORK(pvclock_irq_work, pvclock_irq_work_fn);
8332
8333 /*
8334  * Notification about pvclock gtod data update.
8335  */
8336 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused,
8337                                void *priv)
8338 {
8339         struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
8340         struct timekeeper *tk = priv;
8341
8342         update_pvclock_gtod(tk);
8343
8344         /*
8345          * Disable master clock if host does not trust, or does not use,
8346          * TSC based clocksource. Delegate queue_work() to irq_work as
8347          * this is invoked with tk_core.seq write held.
8348          */
8349         if (!gtod_is_based_on_tsc(gtod->clock.vclock_mode) &&
8350             atomic_read(&kvm_guest_has_master_clock) != 0)
8351                 irq_work_queue(&pvclock_irq_work);
8352         return 0;
8353 }
8354
8355 static struct notifier_block pvclock_gtod_notifier = {
8356         .notifier_call = pvclock_gtod_notify,
8357 };
8358 #endif
8359
8360 int kvm_arch_init(void *opaque)
8361 {
8362         struct kvm_x86_init_ops *ops = opaque;
8363         int r;
8364
8365         if (kvm_x86_ops.hardware_enable) {
8366                 printk(KERN_ERR "kvm: already loaded the other module\n");
8367                 r = -EEXIST;
8368                 goto out;
8369         }
8370
8371         if (!ops->cpu_has_kvm_support()) {
8372                 pr_err_ratelimited("kvm: no hardware support\n");
8373                 r = -EOPNOTSUPP;
8374                 goto out;
8375         }
8376         if (ops->disabled_by_bios()) {
8377                 pr_err_ratelimited("kvm: disabled by bios\n");
8378                 r = -EOPNOTSUPP;
8379                 goto out;
8380         }
8381
8382         /*
8383          * KVM explicitly assumes that the guest has an FPU and
8384          * FXSAVE/FXRSTOR. For example, the KVM_GET_FPU explicitly casts the
8385          * vCPU's FPU state as a fxregs_state struct.
8386          */
8387         if (!boot_cpu_has(X86_FEATURE_FPU) || !boot_cpu_has(X86_FEATURE_FXSR)) {
8388                 printk(KERN_ERR "kvm: inadequate fpu\n");
8389                 r = -EOPNOTSUPP;
8390                 goto out;
8391         }
8392
8393         r = -ENOMEM;
8394         x86_fpu_cache = kmem_cache_create("x86_fpu", sizeof(struct fpu),
8395                                           __alignof__(struct fpu), SLAB_ACCOUNT,
8396                                           NULL);
8397         if (!x86_fpu_cache) {
8398                 printk(KERN_ERR "kvm: failed to allocate cache for x86 fpu\n");
8399                 goto out;
8400         }
8401
8402         x86_emulator_cache = kvm_alloc_emulator_cache();
8403         if (!x86_emulator_cache) {
8404                 pr_err("kvm: failed to allocate cache for x86 emulator\n");
8405                 goto out_free_x86_fpu_cache;
8406         }
8407
8408         user_return_msrs = alloc_percpu(struct kvm_user_return_msrs);
8409         if (!user_return_msrs) {
8410                 printk(KERN_ERR "kvm: failed to allocate percpu kvm_user_return_msrs\n");
8411                 goto out_free_x86_emulator_cache;
8412         }
8413         kvm_nr_uret_msrs = 0;
8414
8415         r = kvm_mmu_module_init();
8416         if (r)
8417                 goto out_free_percpu;
8418
8419         kvm_timer_init();
8420
8421         perf_register_guest_info_callbacks(&kvm_guest_cbs);
8422
8423         if (boot_cpu_has(X86_FEATURE_XSAVE)) {
8424                 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
8425                 supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0;
8426         }
8427
8428         if (pi_inject_timer == -1)
8429                 pi_inject_timer = housekeeping_enabled(HK_FLAG_TIMER);
8430 #ifdef CONFIG_X86_64
8431         pvclock_gtod_register_notifier(&pvclock_gtod_notifier);
8432
8433         if (hypervisor_is_type(X86_HYPER_MS_HYPERV))
8434                 set_hv_tscchange_cb(kvm_hyperv_tsc_notifier);
8435 #endif
8436
8437         return 0;
8438
8439 out_free_percpu:
8440         free_percpu(user_return_msrs);
8441 out_free_x86_emulator_cache:
8442         kmem_cache_destroy(x86_emulator_cache);
8443 out_free_x86_fpu_cache:
8444         kmem_cache_destroy(x86_fpu_cache);
8445 out:
8446         return r;
8447 }
8448
8449 void kvm_arch_exit(void)
8450 {
8451 #ifdef CONFIG_X86_64
8452         if (hypervisor_is_type(X86_HYPER_MS_HYPERV))
8453                 clear_hv_tscchange_cb();
8454 #endif
8455         kvm_lapic_exit();
8456         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
8457
8458         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
8459                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
8460                                             CPUFREQ_TRANSITION_NOTIFIER);
8461         cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE);
8462 #ifdef CONFIG_X86_64
8463         pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier);
8464         irq_work_sync(&pvclock_irq_work);
8465         cancel_work_sync(&pvclock_gtod_work);
8466 #endif
8467         kvm_x86_ops.hardware_enable = NULL;
8468         kvm_mmu_module_exit();
8469         free_percpu(user_return_msrs);
8470         kmem_cache_destroy(x86_emulator_cache);
8471         kmem_cache_destroy(x86_fpu_cache);
8472 #ifdef CONFIG_KVM_XEN
8473         static_key_deferred_flush(&kvm_xen_enabled);
8474         WARN_ON(static_branch_unlikely(&kvm_xen_enabled.key));
8475 #endif
8476 }
8477
8478 static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason)
8479 {
8480         ++vcpu->stat.halt_exits;
8481         if (lapic_in_kernel(vcpu)) {
8482                 vcpu->arch.mp_state = state;
8483                 return 1;
8484         } else {
8485                 vcpu->run->exit_reason = reason;
8486                 return 0;
8487         }
8488 }
8489
8490 int kvm_vcpu_halt(struct kvm_vcpu *vcpu)
8491 {
8492         return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT);
8493 }
8494 EXPORT_SYMBOL_GPL(kvm_vcpu_halt);
8495
8496 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
8497 {
8498         int ret = kvm_skip_emulated_instruction(vcpu);
8499         /*
8500          * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered
8501          * KVM_EXIT_DEBUG here.
8502          */
8503         return kvm_vcpu_halt(vcpu) && ret;
8504 }
8505 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
8506
8507 int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu)
8508 {
8509         int ret = kvm_skip_emulated_instruction(vcpu);
8510
8511         return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, KVM_EXIT_AP_RESET_HOLD) && ret;
8512 }
8513 EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold);
8514
8515 #ifdef CONFIG_X86_64
8516 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
8517                                 unsigned long clock_type)
8518 {
8519         struct kvm_clock_pairing clock_pairing;
8520         struct timespec64 ts;
8521         u64 cycle;
8522         int ret;
8523
8524         if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK)
8525                 return -KVM_EOPNOTSUPP;
8526
8527         if (!kvm_get_walltime_and_clockread(&ts, &cycle))
8528                 return -KVM_EOPNOTSUPP;
8529
8530         clock_pairing.sec = ts.tv_sec;
8531         clock_pairing.nsec = ts.tv_nsec;
8532         clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle);
8533         clock_pairing.flags = 0;
8534         memset(&clock_pairing.pad, 0, sizeof(clock_pairing.pad));
8535
8536         ret = 0;
8537         if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing,
8538                             sizeof(struct kvm_clock_pairing)))
8539                 ret = -KVM_EFAULT;
8540
8541         return ret;
8542 }
8543 #endif
8544
8545 /*
8546  * kvm_pv_kick_cpu_op:  Kick a vcpu.
8547  *
8548  * @apicid - apicid of vcpu to be kicked.
8549  */
8550 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
8551 {
8552         struct kvm_lapic_irq lapic_irq;
8553
8554         lapic_irq.shorthand = APIC_DEST_NOSHORT;
8555         lapic_irq.dest_mode = APIC_DEST_PHYSICAL;
8556         lapic_irq.level = 0;
8557         lapic_irq.dest_id = apicid;
8558         lapic_irq.msi_redir_hint = false;
8559
8560         lapic_irq.delivery_mode = APIC_DM_REMRD;
8561         kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
8562 }
8563
8564 bool kvm_apicv_activated(struct kvm *kvm)
8565 {
8566         return (READ_ONCE(kvm->arch.apicv_inhibit_reasons) == 0);
8567 }
8568 EXPORT_SYMBOL_GPL(kvm_apicv_activated);
8569
8570 static void kvm_apicv_init(struct kvm *kvm)
8571 {
8572         if (enable_apicv)
8573                 clear_bit(APICV_INHIBIT_REASON_DISABLE,
8574                           &kvm->arch.apicv_inhibit_reasons);
8575         else
8576                 set_bit(APICV_INHIBIT_REASON_DISABLE,
8577                         &kvm->arch.apicv_inhibit_reasons);
8578 }
8579
8580 static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
8581 {
8582         struct kvm_vcpu *target = NULL;
8583         struct kvm_apic_map *map;
8584
8585         vcpu->stat.directed_yield_attempted++;
8586
8587         if (single_task_running())
8588                 goto no_yield;
8589
8590         rcu_read_lock();
8591         map = rcu_dereference(vcpu->kvm->arch.apic_map);
8592
8593         if (likely(map) && dest_id <= map->max_apic_id && map->phys_map[dest_id])
8594                 target = map->phys_map[dest_id]->vcpu;
8595
8596         rcu_read_unlock();
8597
8598         if (!target || !READ_ONCE(target->ready))
8599                 goto no_yield;
8600
8601         /* Ignore requests to yield to self */
8602         if (vcpu == target)
8603                 goto no_yield;
8604
8605         if (kvm_vcpu_yield_to(target) <= 0)
8606                 goto no_yield;
8607
8608         vcpu->stat.directed_yield_successful++;
8609
8610 no_yield:
8611         return;
8612 }
8613
8614 static int complete_hypercall_exit(struct kvm_vcpu *vcpu)
8615 {
8616         u64 ret = vcpu->run->hypercall.ret;
8617
8618         if (!is_64_bit_mode(vcpu))
8619                 ret = (u32)ret;
8620         kvm_rax_write(vcpu, ret);
8621         ++vcpu->stat.hypercalls;
8622         return kvm_skip_emulated_instruction(vcpu);
8623 }
8624
8625 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
8626 {
8627         unsigned long nr, a0, a1, a2, a3, ret;
8628         int op_64_bit;
8629
8630         if (kvm_xen_hypercall_enabled(vcpu->kvm))
8631                 return kvm_xen_hypercall(vcpu);
8632
8633         if (kvm_hv_hypercall_enabled(vcpu))
8634                 return kvm_hv_hypercall(vcpu);
8635
8636         nr = kvm_rax_read(vcpu);
8637         a0 = kvm_rbx_read(vcpu);
8638         a1 = kvm_rcx_read(vcpu);
8639         a2 = kvm_rdx_read(vcpu);
8640         a3 = kvm_rsi_read(vcpu);
8641
8642         trace_kvm_hypercall(nr, a0, a1, a2, a3);
8643
8644         op_64_bit = is_64_bit_mode(vcpu);
8645         if (!op_64_bit) {
8646                 nr &= 0xFFFFFFFF;
8647                 a0 &= 0xFFFFFFFF;
8648                 a1 &= 0xFFFFFFFF;
8649                 a2 &= 0xFFFFFFFF;
8650                 a3 &= 0xFFFFFFFF;
8651         }
8652
8653         if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
8654                 ret = -KVM_EPERM;
8655                 goto out;
8656         }
8657
8658         ret = -KVM_ENOSYS;
8659
8660         switch (nr) {
8661         case KVM_HC_VAPIC_POLL_IRQ:
8662                 ret = 0;
8663                 break;
8664         case KVM_HC_KICK_CPU:
8665                 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_UNHALT))
8666                         break;
8667
8668                 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
8669                 kvm_sched_yield(vcpu, a1);
8670                 ret = 0;
8671                 break;
8672 #ifdef CONFIG_X86_64
8673         case KVM_HC_CLOCK_PAIRING:
8674                 ret = kvm_pv_clock_pairing(vcpu, a0, a1);
8675                 break;
8676 #endif
8677         case KVM_HC_SEND_IPI:
8678                 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SEND_IPI))
8679                         break;
8680
8681                 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit);
8682                 break;
8683         case KVM_HC_SCHED_YIELD:
8684                 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SCHED_YIELD))
8685                         break;
8686
8687                 kvm_sched_yield(vcpu, a0);
8688                 ret = 0;
8689                 break;
8690         case KVM_HC_MAP_GPA_RANGE: {
8691                 u64 gpa = a0, npages = a1, attrs = a2;
8692
8693                 ret = -KVM_ENOSYS;
8694                 if (!(vcpu->kvm->arch.hypercall_exit_enabled & (1 << KVM_HC_MAP_GPA_RANGE)))
8695                         break;
8696
8697                 if (!PAGE_ALIGNED(gpa) || !npages ||
8698                     gpa_to_gfn(gpa) + npages <= gpa_to_gfn(gpa)) {
8699                         ret = -KVM_EINVAL;
8700                         break;
8701                 }
8702
8703                 vcpu->run->exit_reason        = KVM_EXIT_HYPERCALL;
8704                 vcpu->run->hypercall.nr       = KVM_HC_MAP_GPA_RANGE;
8705                 vcpu->run->hypercall.args[0]  = gpa;
8706                 vcpu->run->hypercall.args[1]  = npages;
8707                 vcpu->run->hypercall.args[2]  = attrs;
8708                 vcpu->run->hypercall.longmode = op_64_bit;
8709                 vcpu->arch.complete_userspace_io = complete_hypercall_exit;
8710                 return 0;
8711         }
8712         default:
8713                 ret = -KVM_ENOSYS;
8714                 break;
8715         }
8716 out:
8717         if (!op_64_bit)
8718                 ret = (u32)ret;
8719         kvm_rax_write(vcpu, ret);
8720
8721         ++vcpu->stat.hypercalls;
8722         return kvm_skip_emulated_instruction(vcpu);
8723 }
8724 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
8725
8726 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
8727 {
8728         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8729         char instruction[3];
8730         unsigned long rip = kvm_rip_read(vcpu);
8731
8732         static_call(kvm_x86_patch_hypercall)(vcpu, instruction);
8733
8734         return emulator_write_emulated(ctxt, rip, instruction, 3,
8735                 &ctxt->exception);
8736 }
8737
8738 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
8739 {
8740         return vcpu->run->request_interrupt_window &&
8741                 likely(!pic_in_kernel(vcpu->kvm));
8742 }
8743
8744 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
8745 {
8746         struct kvm_run *kvm_run = vcpu->run;
8747
8748         /*
8749          * if_flag is obsolete and useless, so do not bother
8750          * setting it for SEV-ES guests.  Userspace can just
8751          * use kvm_run->ready_for_interrupt_injection.
8752          */
8753         kvm_run->if_flag = !vcpu->arch.guest_state_protected
8754                 && (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
8755
8756         kvm_run->cr8 = kvm_get_cr8(vcpu);
8757         kvm_run->apic_base = kvm_get_apic_base(vcpu);
8758         kvm_run->ready_for_interrupt_injection =
8759                 pic_in_kernel(vcpu->kvm) ||
8760                 kvm_vcpu_ready_for_interrupt_injection(vcpu);
8761
8762         if (is_smm(vcpu))
8763                 kvm_run->flags |= KVM_RUN_X86_SMM;
8764 }
8765
8766 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
8767 {
8768         int max_irr, tpr;
8769
8770         if (!kvm_x86_ops.update_cr8_intercept)
8771                 return;
8772
8773         if (!lapic_in_kernel(vcpu))
8774                 return;
8775
8776         if (vcpu->arch.apicv_active)
8777                 return;
8778
8779         if (!vcpu->arch.apic->vapic_addr)
8780                 max_irr = kvm_lapic_find_highest_irr(vcpu);
8781         else
8782                 max_irr = -1;
8783
8784         if (max_irr != -1)
8785                 max_irr >>= 4;
8786
8787         tpr = kvm_lapic_get_cr8(vcpu);
8788
8789         static_call(kvm_x86_update_cr8_intercept)(vcpu, tpr, max_irr);
8790 }
8791
8792
8793 int kvm_check_nested_events(struct kvm_vcpu *vcpu)
8794 {
8795         if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
8796                 kvm_x86_ops.nested_ops->triple_fault(vcpu);
8797                 return 1;
8798         }
8799
8800         return kvm_x86_ops.nested_ops->check_events(vcpu);
8801 }
8802
8803 static void kvm_inject_exception(struct kvm_vcpu *vcpu)
8804 {
8805         if (vcpu->arch.exception.error_code && !is_protmode(vcpu))
8806                 vcpu->arch.exception.error_code = false;
8807         static_call(kvm_x86_queue_exception)(vcpu);
8808 }
8809
8810 static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
8811 {
8812         int r;
8813         bool can_inject = true;
8814
8815         /* try to reinject previous events if any */
8816
8817         if (vcpu->arch.exception.injected) {
8818                 kvm_inject_exception(vcpu);
8819                 can_inject = false;
8820         }
8821         /*
8822          * Do not inject an NMI or interrupt if there is a pending
8823          * exception.  Exceptions and interrupts are recognized at
8824          * instruction boundaries, i.e. the start of an instruction.
8825          * Trap-like exceptions, e.g. #DB, have higher priority than
8826          * NMIs and interrupts, i.e. traps are recognized before an
8827          * NMI/interrupt that's pending on the same instruction.
8828          * Fault-like exceptions, e.g. #GP and #PF, are the lowest
8829          * priority, but are only generated (pended) during instruction
8830          * execution, i.e. a pending fault-like exception means the
8831          * fault occurred on the *previous* instruction and must be
8832          * serviced prior to recognizing any new events in order to
8833          * fully complete the previous instruction.
8834          */
8835         else if (!vcpu->arch.exception.pending) {
8836                 if (vcpu->arch.nmi_injected) {
8837                         static_call(kvm_x86_set_nmi)(vcpu);
8838                         can_inject = false;
8839                 } else if (vcpu->arch.interrupt.injected) {
8840                         static_call(kvm_x86_set_irq)(vcpu);
8841                         can_inject = false;
8842                 }
8843         }
8844
8845         WARN_ON_ONCE(vcpu->arch.exception.injected &&
8846                      vcpu->arch.exception.pending);
8847
8848         /*
8849          * Call check_nested_events() even if we reinjected a previous event
8850          * in order for caller to determine if it should require immediate-exit
8851          * from L2 to L1 due to pending L1 events which require exit
8852          * from L2 to L1.
8853          */
8854         if (is_guest_mode(vcpu)) {
8855                 r = kvm_check_nested_events(vcpu);
8856                 if (r < 0)
8857                         goto out;
8858         }
8859
8860         /* try to inject new event if pending */
8861         if (vcpu->arch.exception.pending) {
8862                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
8863                                         vcpu->arch.exception.has_error_code,
8864                                         vcpu->arch.exception.error_code);
8865
8866                 vcpu->arch.exception.pending = false;
8867                 vcpu->arch.exception.injected = true;
8868
8869                 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
8870                         __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
8871                                              X86_EFLAGS_RF);
8872
8873                 if (vcpu->arch.exception.nr == DB_VECTOR) {
8874                         kvm_deliver_exception_payload(vcpu);
8875                         if (vcpu->arch.dr7 & DR7_GD) {
8876                                 vcpu->arch.dr7 &= ~DR7_GD;
8877                                 kvm_update_dr7(vcpu);
8878                         }
8879                 }
8880
8881                 kvm_inject_exception(vcpu);
8882                 can_inject = false;
8883         }
8884
8885         /*
8886          * Finally, inject interrupt events.  If an event cannot be injected
8887          * due to architectural conditions (e.g. IF=0) a window-open exit
8888          * will re-request KVM_REQ_EVENT.  Sometimes however an event is pending
8889          * and can architecturally be injected, but we cannot do it right now:
8890          * an interrupt could have arrived just now and we have to inject it
8891          * as a vmexit, or there could already an event in the queue, which is
8892          * indicated by can_inject.  In that case we request an immediate exit
8893          * in order to make progress and get back here for another iteration.
8894          * The kvm_x86_ops hooks communicate this by returning -EBUSY.
8895          */
8896         if (vcpu->arch.smi_pending) {
8897                 r = can_inject ? static_call(kvm_x86_smi_allowed)(vcpu, true) : -EBUSY;
8898                 if (r < 0)
8899                         goto out;
8900                 if (r) {
8901                         vcpu->arch.smi_pending = false;
8902                         ++vcpu->arch.smi_count;
8903                         enter_smm(vcpu);
8904                         can_inject = false;
8905                 } else
8906                         static_call(kvm_x86_enable_smi_window)(vcpu);
8907         }
8908
8909         if (vcpu->arch.nmi_pending) {
8910                 r = can_inject ? static_call(kvm_x86_nmi_allowed)(vcpu, true) : -EBUSY;
8911                 if (r < 0)
8912                         goto out;
8913                 if (r) {
8914                         --vcpu->arch.nmi_pending;
8915                         vcpu->arch.nmi_injected = true;
8916                         static_call(kvm_x86_set_nmi)(vcpu);
8917                         can_inject = false;
8918                         WARN_ON(static_call(kvm_x86_nmi_allowed)(vcpu, true) < 0);
8919                 }
8920                 if (vcpu->arch.nmi_pending)
8921                         static_call(kvm_x86_enable_nmi_window)(vcpu);
8922         }
8923
8924         if (kvm_cpu_has_injectable_intr(vcpu)) {
8925                 r = can_inject ? static_call(kvm_x86_interrupt_allowed)(vcpu, true) : -EBUSY;
8926                 if (r < 0)
8927                         goto out;
8928                 if (r) {
8929                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), false);
8930                         static_call(kvm_x86_set_irq)(vcpu);
8931                         WARN_ON(static_call(kvm_x86_interrupt_allowed)(vcpu, true) < 0);
8932                 }
8933                 if (kvm_cpu_has_injectable_intr(vcpu))
8934                         static_call(kvm_x86_enable_irq_window)(vcpu);
8935         }
8936
8937         if (is_guest_mode(vcpu) &&
8938             kvm_x86_ops.nested_ops->hv_timer_pending &&
8939             kvm_x86_ops.nested_ops->hv_timer_pending(vcpu))
8940                 *req_immediate_exit = true;
8941
8942         WARN_ON(vcpu->arch.exception.pending);
8943         return 0;
8944
8945 out:
8946         if (r == -EBUSY) {
8947                 *req_immediate_exit = true;
8948                 r = 0;
8949         }
8950         return r;
8951 }
8952
8953 static void process_nmi(struct kvm_vcpu *vcpu)
8954 {
8955         unsigned limit = 2;
8956
8957         /*
8958          * x86 is limited to one NMI running, and one NMI pending after it.
8959          * If an NMI is already in progress, limit further NMIs to just one.
8960          * Otherwise, allow two (and we'll inject the first one immediately).
8961          */
8962         if (static_call(kvm_x86_get_nmi_mask)(vcpu) || vcpu->arch.nmi_injected)
8963                 limit = 1;
8964
8965         vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
8966         vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
8967         kvm_make_request(KVM_REQ_EVENT, vcpu);
8968 }
8969
8970 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
8971 {
8972         u32 flags = 0;
8973         flags |= seg->g       << 23;
8974         flags |= seg->db      << 22;
8975         flags |= seg->l       << 21;
8976         flags |= seg->avl     << 20;
8977         flags |= seg->present << 15;
8978         flags |= seg->dpl     << 13;
8979         flags |= seg->s       << 12;
8980         flags |= seg->type    << 8;
8981         return flags;
8982 }
8983
8984 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
8985 {
8986         struct kvm_segment seg;
8987         int offset;
8988
8989         kvm_get_segment(vcpu, &seg, n);
8990         put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector);
8991
8992         if (n < 3)
8993                 offset = 0x7f84 + n * 12;
8994         else
8995                 offset = 0x7f2c + (n - 3) * 12;
8996
8997         put_smstate(u32, buf, offset + 8, seg.base);
8998         put_smstate(u32, buf, offset + 4, seg.limit);
8999         put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg));
9000 }
9001
9002 #ifdef CONFIG_X86_64
9003 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
9004 {
9005         struct kvm_segment seg;
9006         int offset;
9007         u16 flags;
9008
9009         kvm_get_segment(vcpu, &seg, n);
9010         offset = 0x7e00 + n * 16;
9011
9012         flags = enter_smm_get_segment_flags(&seg) >> 8;
9013         put_smstate(u16, buf, offset, seg.selector);
9014         put_smstate(u16, buf, offset + 2, flags);
9015         put_smstate(u32, buf, offset + 4, seg.limit);
9016         put_smstate(u64, buf, offset + 8, seg.base);
9017 }
9018 #endif
9019
9020 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
9021 {
9022         struct desc_ptr dt;
9023         struct kvm_segment seg;
9024         unsigned long val;
9025         int i;
9026
9027         put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
9028         put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
9029         put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
9030         put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
9031
9032         for (i = 0; i < 8; i++)
9033                 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
9034
9035         kvm_get_dr(vcpu, 6, &val);
9036         put_smstate(u32, buf, 0x7fcc, (u32)val);
9037         kvm_get_dr(vcpu, 7, &val);
9038         put_smstate(u32, buf, 0x7fc8, (u32)val);
9039
9040         kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
9041         put_smstate(u32, buf, 0x7fc4, seg.selector);
9042         put_smstate(u32, buf, 0x7f64, seg.base);
9043         put_smstate(u32, buf, 0x7f60, seg.limit);
9044         put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
9045
9046         kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
9047         put_smstate(u32, buf, 0x7fc0, seg.selector);
9048         put_smstate(u32, buf, 0x7f80, seg.base);
9049         put_smstate(u32, buf, 0x7f7c, seg.limit);
9050         put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
9051
9052         static_call(kvm_x86_get_gdt)(vcpu, &dt);
9053         put_smstate(u32, buf, 0x7f74, dt.address);
9054         put_smstate(u32, buf, 0x7f70, dt.size);
9055
9056         static_call(kvm_x86_get_idt)(vcpu, &dt);
9057         put_smstate(u32, buf, 0x7f58, dt.address);
9058         put_smstate(u32, buf, 0x7f54, dt.size);
9059
9060         for (i = 0; i < 6; i++)
9061                 enter_smm_save_seg_32(vcpu, buf, i);
9062
9063         put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
9064
9065         /* revision id */
9066         put_smstate(u32, buf, 0x7efc, 0x00020000);
9067         put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase);
9068 }
9069
9070 #ifdef CONFIG_X86_64
9071 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
9072 {
9073         struct desc_ptr dt;
9074         struct kvm_segment seg;
9075         unsigned long val;
9076         int i;
9077
9078         for (i = 0; i < 16; i++)
9079                 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
9080
9081         put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu));
9082         put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
9083
9084         kvm_get_dr(vcpu, 6, &val);
9085         put_smstate(u64, buf, 0x7f68, val);
9086         kvm_get_dr(vcpu, 7, &val);
9087         put_smstate(u64, buf, 0x7f60, val);
9088
9089         put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
9090         put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
9091         put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
9092
9093         put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase);
9094
9095         /* revision id */
9096         put_smstate(u32, buf, 0x7efc, 0x00020064);
9097
9098         put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer);
9099
9100         kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
9101         put_smstate(u16, buf, 0x7e90, seg.selector);
9102         put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
9103         put_smstate(u32, buf, 0x7e94, seg.limit);
9104         put_smstate(u64, buf, 0x7e98, seg.base);
9105
9106         static_call(kvm_x86_get_idt)(vcpu, &dt);
9107         put_smstate(u32, buf, 0x7e84, dt.size);
9108         put_smstate(u64, buf, 0x7e88, dt.address);
9109
9110         kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
9111         put_smstate(u16, buf, 0x7e70, seg.selector);
9112         put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
9113         put_smstate(u32, buf, 0x7e74, seg.limit);
9114         put_smstate(u64, buf, 0x7e78, seg.base);
9115
9116         static_call(kvm_x86_get_gdt)(vcpu, &dt);
9117         put_smstate(u32, buf, 0x7e64, dt.size);
9118         put_smstate(u64, buf, 0x7e68, dt.address);
9119
9120         for (i = 0; i < 6; i++)
9121                 enter_smm_save_seg_64(vcpu, buf, i);
9122 }
9123 #endif
9124
9125 static void enter_smm(struct kvm_vcpu *vcpu)
9126 {
9127         struct kvm_segment cs, ds;
9128         struct desc_ptr dt;
9129         unsigned long cr0;
9130         char buf[512];
9131
9132         memset(buf, 0, 512);
9133 #ifdef CONFIG_X86_64
9134         if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
9135                 enter_smm_save_state_64(vcpu, buf);
9136         else
9137 #endif
9138                 enter_smm_save_state_32(vcpu, buf);
9139
9140         /*
9141          * Give enter_smm() a chance to make ISA-specific changes to the vCPU
9142          * state (e.g. leave guest mode) after we've saved the state into the
9143          * SMM state-save area.
9144          */
9145         static_call(kvm_x86_enter_smm)(vcpu, buf);
9146
9147         kvm_smm_changed(vcpu, true);
9148         kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
9149
9150         if (static_call(kvm_x86_get_nmi_mask)(vcpu))
9151                 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
9152         else
9153                 static_call(kvm_x86_set_nmi_mask)(vcpu, true);
9154
9155         kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
9156         kvm_rip_write(vcpu, 0x8000);
9157
9158         cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
9159         static_call(kvm_x86_set_cr0)(vcpu, cr0);
9160         vcpu->arch.cr0 = cr0;
9161
9162         static_call(kvm_x86_set_cr4)(vcpu, 0);
9163
9164         /* Undocumented: IDT limit is set to zero on entry to SMM.  */
9165         dt.address = dt.size = 0;
9166         static_call(kvm_x86_set_idt)(vcpu, &dt);
9167
9168         kvm_set_dr(vcpu, 7, DR7_FIXED_1);
9169
9170         cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
9171         cs.base = vcpu->arch.smbase;
9172
9173         ds.selector = 0;
9174         ds.base = 0;
9175
9176         cs.limit    = ds.limit = 0xffffffff;
9177         cs.type     = ds.type = 0x3;
9178         cs.dpl      = ds.dpl = 0;
9179         cs.db       = ds.db = 0;
9180         cs.s        = ds.s = 1;
9181         cs.l        = ds.l = 0;
9182         cs.g        = ds.g = 1;
9183         cs.avl      = ds.avl = 0;
9184         cs.present  = ds.present = 1;
9185         cs.unusable = ds.unusable = 0;
9186         cs.padding  = ds.padding = 0;
9187
9188         kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
9189         kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
9190         kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
9191         kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
9192         kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
9193         kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
9194
9195 #ifdef CONFIG_X86_64
9196         if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
9197                 static_call(kvm_x86_set_efer)(vcpu, 0);
9198 #endif
9199
9200         kvm_update_cpuid_runtime(vcpu);
9201         kvm_mmu_reset_context(vcpu);
9202 }
9203
9204 static void process_smi(struct kvm_vcpu *vcpu)
9205 {
9206         vcpu->arch.smi_pending = true;
9207         kvm_make_request(KVM_REQ_EVENT, vcpu);
9208 }
9209
9210 void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
9211                                        unsigned long *vcpu_bitmap)
9212 {
9213         cpumask_var_t cpus;
9214
9215         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
9216
9217         kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC,
9218                                     NULL, vcpu_bitmap, cpus);
9219
9220         free_cpumask_var(cpus);
9221 }
9222
9223 void kvm_make_scan_ioapic_request(struct kvm *kvm)
9224 {
9225         kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
9226 }
9227
9228 void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
9229 {
9230         if (!lapic_in_kernel(vcpu))
9231                 return;
9232
9233         vcpu->arch.apicv_active = kvm_apicv_activated(vcpu->kvm);
9234         kvm_apic_update_apicv(vcpu);
9235         static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);
9236
9237         /*
9238          * When APICv gets disabled, we may still have injected interrupts
9239          * pending. At the same time, KVM_REQ_EVENT may not be set as APICv was
9240          * still active when the interrupt got accepted. Make sure
9241          * inject_pending_event() is called to check for that.
9242          */
9243         if (!vcpu->arch.apicv_active)
9244                 kvm_make_request(KVM_REQ_EVENT, vcpu);
9245 }
9246 EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
9247
9248 /*
9249  * NOTE: Do not hold any lock prior to calling this.
9250  *
9251  * In particular, kvm_request_apicv_update() expects kvm->srcu not to be
9252  * locked, because it calls __x86_set_memory_region() which does
9253  * synchronize_srcu(&kvm->srcu).
9254  */
9255 void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
9256 {
9257         struct kvm_vcpu *except;
9258         unsigned long old, new, expected;
9259
9260         if (!kvm_x86_ops.check_apicv_inhibit_reasons ||
9261             !static_call(kvm_x86_check_apicv_inhibit_reasons)(bit))
9262                 return;
9263
9264         old = READ_ONCE(kvm->arch.apicv_inhibit_reasons);
9265         do {
9266                 expected = new = old;
9267                 if (activate)
9268                         __clear_bit(bit, &new);
9269                 else
9270                         __set_bit(bit, &new);
9271                 if (new == old)
9272                         break;
9273                 old = cmpxchg(&kvm->arch.apicv_inhibit_reasons, expected, new);
9274         } while (old != expected);
9275
9276         if (!!old == !!new)
9277                 return;
9278
9279         trace_kvm_apicv_update_request(activate, bit);
9280         if (kvm_x86_ops.pre_update_apicv_exec_ctrl)
9281                 static_call(kvm_x86_pre_update_apicv_exec_ctrl)(kvm, activate);
9282
9283         /*
9284          * Sending request to update APICV for all other vcpus,
9285          * while update the calling vcpu immediately instead of
9286          * waiting for another #VMEXIT to handle the request.
9287          */
9288         except = kvm_get_running_vcpu();
9289         kvm_make_all_cpus_request_except(kvm, KVM_REQ_APICV_UPDATE,
9290                                          except);
9291         if (except)
9292                 kvm_vcpu_update_apicv(except);
9293 }
9294 EXPORT_SYMBOL_GPL(kvm_request_apicv_update);
9295
9296 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
9297 {
9298         if (!kvm_apic_present(vcpu))
9299                 return;
9300
9301         bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256);
9302
9303         if (irqchip_split(vcpu->kvm))
9304                 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors);
9305         else {
9306                 if (vcpu->arch.apicv_active)
9307                         static_call(kvm_x86_sync_pir_to_irr)(vcpu);
9308                 if (ioapic_in_kernel(vcpu->kvm))
9309                         kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
9310         }
9311
9312         if (is_guest_mode(vcpu))
9313                 vcpu->arch.load_eoi_exitmap_pending = true;
9314         else
9315                 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
9316 }
9317
9318 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu)
9319 {
9320         u64 eoi_exit_bitmap[4];
9321
9322         if (!kvm_apic_hw_enabled(vcpu->arch.apic))
9323                 return;
9324
9325         if (to_hv_vcpu(vcpu))
9326                 bitmap_or((ulong *)eoi_exit_bitmap,
9327                           vcpu->arch.ioapic_handled_vectors,
9328                           to_hv_synic(vcpu)->vec_bitmap, 256);
9329
9330         static_call(kvm_x86_load_eoi_exitmap)(vcpu, eoi_exit_bitmap);
9331 }
9332
9333 void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
9334                                             unsigned long start, unsigned long end)
9335 {
9336         unsigned long apic_address;
9337
9338         /*
9339          * The physical address of apic access page is stored in the VMCS.
9340          * Update it when it becomes invalid.
9341          */
9342         apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
9343         if (start <= apic_address && apic_address < end)
9344                 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
9345 }
9346
9347 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
9348 {
9349         if (!lapic_in_kernel(vcpu))
9350                 return;
9351
9352         if (!kvm_x86_ops.set_apic_access_page_addr)
9353                 return;
9354
9355         static_call(kvm_x86_set_apic_access_page_addr)(vcpu);
9356 }
9357
9358 void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu)
9359 {
9360         smp_send_reschedule(vcpu->cpu);
9361 }
9362 EXPORT_SYMBOL_GPL(__kvm_request_immediate_exit);
9363
9364 /*
9365  * Returns 1 to let vcpu_run() continue the guest execution loop without
9366  * exiting to the userspace.  Otherwise, the value will be returned to the
9367  * userspace.
9368  */
9369 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
9370 {
9371         int r;
9372         bool req_int_win =
9373                 dm_request_for_irq_injection(vcpu) &&
9374                 kvm_cpu_accept_dm_intr(vcpu);
9375         fastpath_t exit_fastpath;
9376
9377         bool req_immediate_exit = false;
9378
9379         /* Forbid vmenter if vcpu dirty ring is soft-full */
9380         if (unlikely(vcpu->kvm->dirty_ring_size &&
9381                      kvm_dirty_ring_soft_full(&vcpu->dirty_ring))) {
9382                 vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL;
9383                 trace_kvm_dirty_ring_exit(vcpu);
9384                 r = 0;
9385                 goto out;
9386         }
9387
9388         if (kvm_request_pending(vcpu)) {
9389                 if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
9390                         if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) {
9391                                 r = 0;
9392                                 goto out;
9393                         }
9394                 }
9395                 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
9396                         kvm_mmu_unload(vcpu);
9397                 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
9398                         __kvm_migrate_timers(vcpu);
9399                 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
9400                         kvm_gen_update_masterclock(vcpu->kvm);
9401                 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
9402                         kvm_gen_kvmclock_update(vcpu);
9403                 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
9404                         r = kvm_guest_time_update(vcpu);
9405                         if (unlikely(r))
9406                                 goto out;
9407                 }
9408                 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
9409                         kvm_mmu_sync_roots(vcpu);
9410                 if (kvm_check_request(KVM_REQ_LOAD_MMU_PGD, vcpu))
9411                         kvm_mmu_load_pgd(vcpu);
9412                 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
9413                         kvm_vcpu_flush_tlb_all(vcpu);
9414
9415                         /* Flushing all ASIDs flushes the current ASID... */
9416                         kvm_clear_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
9417                 }
9418                 if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu))
9419                         kvm_vcpu_flush_tlb_current(vcpu);
9420                 if (kvm_check_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu))
9421                         kvm_vcpu_flush_tlb_guest(vcpu);
9422
9423                 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
9424                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
9425                         r = 0;
9426                         goto out;
9427                 }
9428                 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
9429                         if (is_guest_mode(vcpu)) {
9430                                 kvm_x86_ops.nested_ops->triple_fault(vcpu);
9431                         } else {
9432                                 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
9433                                 vcpu->mmio_needed = 0;
9434                                 r = 0;
9435                                 goto out;
9436                         }
9437                 }
9438                 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
9439                         /* Page is swapped out. Do synthetic halt */
9440                         vcpu->arch.apf.halted = true;
9441                         r = 1;
9442                         goto out;
9443                 }
9444                 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
9445                         record_steal_time(vcpu);
9446                 if (kvm_check_request(KVM_REQ_SMI, vcpu))
9447                         process_smi(vcpu);
9448                 if (kvm_check_request(KVM_REQ_NMI, vcpu))
9449                         process_nmi(vcpu);
9450                 if (kvm_check_request(KVM_REQ_PMU, vcpu))
9451                         kvm_pmu_handle_event(vcpu);
9452                 if (kvm_check_request(KVM_REQ_PMI, vcpu))
9453                         kvm_pmu_deliver_pmi(vcpu);
9454                 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {
9455                         BUG_ON(vcpu->arch.pending_ioapic_eoi > 255);
9456                         if (test_bit(vcpu->arch.pending_ioapic_eoi,
9457                                      vcpu->arch.ioapic_handled_vectors)) {
9458                                 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI;
9459                                 vcpu->run->eoi.vector =
9460                                                 vcpu->arch.pending_ioapic_eoi;
9461                                 r = 0;
9462                                 goto out;
9463                         }
9464                 }
9465                 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
9466                         vcpu_scan_ioapic(vcpu);
9467                 if (kvm_check_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu))
9468                         vcpu_load_eoi_exitmap(vcpu);
9469                 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
9470                         kvm_vcpu_reload_apic_access_page(vcpu);
9471                 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
9472                         vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
9473                         vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
9474                         r = 0;
9475                         goto out;
9476                 }
9477                 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) {
9478                         vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
9479                         vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET;
9480                         r = 0;
9481                         goto out;
9482                 }
9483                 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) {
9484                         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
9485
9486                         vcpu->run->exit_reason = KVM_EXIT_HYPERV;
9487                         vcpu->run->hyperv = hv_vcpu->exit;
9488                         r = 0;
9489                         goto out;
9490                 }
9491
9492                 /*
9493                  * KVM_REQ_HV_STIMER has to be processed after
9494                  * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers
9495                  * depend on the guest clock being up-to-date
9496                  */
9497                 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu))
9498                         kvm_hv_process_stimers(vcpu);
9499                 if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu))
9500                         kvm_vcpu_update_apicv(vcpu);
9501                 if (kvm_check_request(KVM_REQ_APF_READY, vcpu))
9502                         kvm_check_async_pf_completion(vcpu);
9503                 if (kvm_check_request(KVM_REQ_MSR_FILTER_CHANGED, vcpu))
9504                         static_call(kvm_x86_msr_filter_changed)(vcpu);
9505
9506                 if (kvm_check_request(KVM_REQ_UPDATE_CPU_DIRTY_LOGGING, vcpu))
9507                         static_call(kvm_x86_update_cpu_dirty_logging)(vcpu);
9508         }
9509
9510         if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win ||
9511             kvm_xen_has_interrupt(vcpu)) {
9512                 ++vcpu->stat.req_event;
9513                 r = kvm_apic_accept_events(vcpu);
9514                 if (r < 0) {
9515                         r = 0;
9516                         goto out;
9517                 }
9518                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
9519                         r = 1;
9520                         goto out;
9521                 }
9522
9523                 r = inject_pending_event(vcpu, &req_immediate_exit);
9524                 if (r < 0) {
9525                         r = 0;
9526                         goto out;
9527                 }
9528                 if (req_int_win)
9529                         static_call(kvm_x86_enable_irq_window)(vcpu);
9530
9531                 if (kvm_lapic_enabled(vcpu)) {
9532                         update_cr8_intercept(vcpu);
9533                         kvm_lapic_sync_to_vapic(vcpu);
9534                 }
9535         }
9536
9537         r = kvm_mmu_reload(vcpu);
9538         if (unlikely(r)) {
9539                 goto cancel_injection;
9540         }
9541
9542         preempt_disable();
9543
9544         static_call(kvm_x86_prepare_guest_switch)(vcpu);
9545
9546         /*
9547          * Disable IRQs before setting IN_GUEST_MODE.  Posted interrupt
9548          * IPI are then delayed after guest entry, which ensures that they
9549          * result in virtual interrupt delivery.
9550          */
9551         local_irq_disable();
9552         vcpu->mode = IN_GUEST_MODE;
9553
9554         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
9555
9556         /*
9557          * 1) We should set ->mode before checking ->requests.  Please see
9558          * the comment in kvm_vcpu_exiting_guest_mode().
9559          *
9560          * 2) For APICv, we should set ->mode before checking PID.ON. This
9561          * pairs with the memory barrier implicit in pi_test_and_set_on
9562          * (see vmx_deliver_posted_interrupt).
9563          *
9564          * 3) This also orders the write to mode from any reads to the page
9565          * tables done while the VCPU is running.  Please see the comment
9566          * in kvm_flush_remote_tlbs.
9567          */
9568         smp_mb__after_srcu_read_unlock();
9569
9570         /*
9571          * This handles the case where a posted interrupt was
9572          * notified with kvm_vcpu_kick.
9573          */
9574         if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
9575                 static_call(kvm_x86_sync_pir_to_irr)(vcpu);
9576
9577         if (kvm_vcpu_exit_request(vcpu)) {
9578                 vcpu->mode = OUTSIDE_GUEST_MODE;
9579                 smp_wmb();
9580                 local_irq_enable();
9581                 preempt_enable();
9582                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
9583                 r = 1;
9584                 goto cancel_injection;
9585         }
9586
9587         if (req_immediate_exit) {
9588                 kvm_make_request(KVM_REQ_EVENT, vcpu);
9589                 static_call(kvm_x86_request_immediate_exit)(vcpu);
9590         }
9591
9592         fpregs_assert_state_consistent();
9593         if (test_thread_flag(TIF_NEED_FPU_LOAD))
9594                 switch_fpu_return();
9595
9596         if (unlikely(vcpu->arch.switch_db_regs)) {
9597                 set_debugreg(0, 7);
9598                 set_debugreg(vcpu->arch.eff_db[0], 0);
9599                 set_debugreg(vcpu->arch.eff_db[1], 1);
9600                 set_debugreg(vcpu->arch.eff_db[2], 2);
9601                 set_debugreg(vcpu->arch.eff_db[3], 3);
9602                 set_debugreg(vcpu->arch.dr6, 6);
9603                 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
9604         } else if (unlikely(hw_breakpoint_active())) {
9605                 set_debugreg(0, 7);
9606         }
9607
9608         for (;;) {
9609                 exit_fastpath = static_call(kvm_x86_run)(vcpu);
9610                 if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST))
9611                         break;
9612
9613                 if (unlikely(kvm_vcpu_exit_request(vcpu))) {
9614                         exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
9615                         break;
9616                 }
9617
9618                 if (vcpu->arch.apicv_active)
9619                         static_call(kvm_x86_sync_pir_to_irr)(vcpu);
9620         }
9621
9622         /*
9623          * Do this here before restoring debug registers on the host.  And
9624          * since we do this before handling the vmexit, a DR access vmexit
9625          * can (a) read the correct value of the debug registers, (b) set
9626          * KVM_DEBUGREG_WONT_EXIT again.
9627          */
9628         if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) {
9629                 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
9630                 static_call(kvm_x86_sync_dirty_debug_regs)(vcpu);
9631                 kvm_update_dr0123(vcpu);
9632                 kvm_update_dr7(vcpu);
9633                 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
9634         }
9635
9636         /*
9637          * If the guest has used debug registers, at least dr7
9638          * will be disabled while returning to the host.
9639          * If we don't have active breakpoints in the host, we don't
9640          * care about the messed up debug address registers. But if
9641          * we have some of them active, restore the old state.
9642          */
9643         if (hw_breakpoint_active())
9644                 hw_breakpoint_restore();
9645
9646         vcpu->arch.last_vmentry_cpu = vcpu->cpu;
9647         vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
9648
9649         vcpu->mode = OUTSIDE_GUEST_MODE;
9650         smp_wmb();
9651
9652         static_call(kvm_x86_handle_exit_irqoff)(vcpu);
9653
9654         /*
9655          * Consume any pending interrupts, including the possible source of
9656          * VM-Exit on SVM and any ticks that occur between VM-Exit and now.
9657          * An instruction is required after local_irq_enable() to fully unblock
9658          * interrupts on processors that implement an interrupt shadow, the
9659          * stat.exits increment will do nicely.
9660          */
9661         kvm_before_interrupt(vcpu);
9662         local_irq_enable();
9663         ++vcpu->stat.exits;
9664         local_irq_disable();
9665         kvm_after_interrupt(vcpu);
9666
9667         /*
9668          * Wait until after servicing IRQs to account guest time so that any
9669          * ticks that occurred while running the guest are properly accounted
9670          * to the guest.  Waiting until IRQs are enabled degrades the accuracy
9671          * of accounting via context tracking, but the loss of accuracy is
9672          * acceptable for all known use cases.
9673          */
9674         vtime_account_guest_exit();
9675
9676         if (lapic_in_kernel(vcpu)) {
9677                 s64 delta = vcpu->arch.apic->lapic_timer.advance_expire_delta;
9678                 if (delta != S64_MIN) {
9679                         trace_kvm_wait_lapic_expire(vcpu->vcpu_id, delta);
9680                         vcpu->arch.apic->lapic_timer.advance_expire_delta = S64_MIN;
9681                 }
9682         }
9683
9684         local_irq_enable();
9685         preempt_enable();
9686
9687         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
9688
9689         /*
9690          * Profile KVM exit RIPs:
9691          */
9692         if (unlikely(prof_on == KVM_PROFILING)) {
9693                 unsigned long rip = kvm_rip_read(vcpu);
9694                 profile_hit(KVM_PROFILING, (void *)rip);
9695         }
9696
9697         if (unlikely(vcpu->arch.tsc_always_catchup))
9698                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
9699
9700         if (vcpu->arch.apic_attention)
9701                 kvm_lapic_sync_from_vapic(vcpu);
9702
9703         r = static_call(kvm_x86_handle_exit)(vcpu, exit_fastpath);
9704         return r;
9705
9706 cancel_injection:
9707         if (req_immediate_exit)
9708                 kvm_make_request(KVM_REQ_EVENT, vcpu);
9709         static_call(kvm_x86_cancel_injection)(vcpu);
9710         if (unlikely(vcpu->arch.apic_attention))
9711                 kvm_lapic_sync_from_vapic(vcpu);
9712 out:
9713         return r;
9714 }
9715
9716 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
9717 {
9718         if (!kvm_arch_vcpu_runnable(vcpu) &&
9719             (!kvm_x86_ops.pre_block || static_call(kvm_x86_pre_block)(vcpu) == 0)) {
9720                 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
9721                 kvm_vcpu_block(vcpu);
9722                 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
9723
9724                 if (kvm_x86_ops.post_block)
9725                         static_call(kvm_x86_post_block)(vcpu);
9726
9727                 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
9728                         return 1;
9729         }
9730
9731         if (kvm_apic_accept_events(vcpu) < 0)
9732                 return 0;
9733         switch(vcpu->arch.mp_state) {
9734         case KVM_MP_STATE_HALTED:
9735         case KVM_MP_STATE_AP_RESET_HOLD:
9736                 vcpu->arch.pv.pv_unhalted = false;
9737                 vcpu->arch.mp_state =
9738                         KVM_MP_STATE_RUNNABLE;
9739                 fallthrough;
9740         case KVM_MP_STATE_RUNNABLE:
9741                 vcpu->arch.apf.halted = false;
9742                 break;
9743         case KVM_MP_STATE_INIT_RECEIVED:
9744                 break;
9745         default:
9746                 return -EINTR;
9747         }
9748         return 1;
9749 }
9750
9751 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
9752 {
9753         if (is_guest_mode(vcpu))
9754                 kvm_check_nested_events(vcpu);
9755
9756         return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
9757                 !vcpu->arch.apf.halted);
9758 }
9759
9760 static int vcpu_run(struct kvm_vcpu *vcpu)
9761 {
9762         int r;
9763         struct kvm *kvm = vcpu->kvm;
9764
9765         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
9766         vcpu->arch.l1tf_flush_l1d = true;
9767
9768         for (;;) {
9769                 if (kvm_vcpu_running(vcpu)) {
9770                         r = vcpu_enter_guest(vcpu);
9771                 } else {
9772                         r = vcpu_block(kvm, vcpu);
9773                 }
9774
9775                 if (r <= 0)
9776                         break;
9777
9778                 kvm_clear_request(KVM_REQ_UNBLOCK, vcpu);
9779                 if (kvm_cpu_has_pending_timer(vcpu))
9780                         kvm_inject_pending_timer_irqs(vcpu);
9781
9782                 if (dm_request_for_irq_injection(vcpu) &&
9783                         kvm_vcpu_ready_for_interrupt_injection(vcpu)) {
9784                         r = 0;
9785                         vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
9786                         ++vcpu->stat.request_irq_exits;
9787                         break;
9788                 }
9789
9790                 if (__xfer_to_guest_mode_work_pending()) {
9791                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
9792                         r = xfer_to_guest_mode_handle_work(vcpu);
9793                         if (r)
9794                                 return r;
9795                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
9796                 }
9797         }
9798
9799         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
9800
9801         return r;
9802 }
9803
9804 static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
9805 {
9806         int r;
9807
9808         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
9809         r = kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
9810         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
9811         return r;
9812 }
9813
9814 static int complete_emulated_pio(struct kvm_vcpu *vcpu)
9815 {
9816         BUG_ON(!vcpu->arch.pio.count);
9817
9818         return complete_emulated_io(vcpu);
9819 }
9820
9821 /*
9822  * Implements the following, as a state machine:
9823  *
9824  * read:
9825  *   for each fragment
9826  *     for each mmio piece in the fragment
9827  *       write gpa, len
9828  *       exit
9829  *       copy data
9830  *   execute insn
9831  *
9832  * write:
9833  *   for each fragment
9834  *     for each mmio piece in the fragment
9835  *       write gpa, len
9836  *       copy data
9837  *       exit
9838  */
9839 static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
9840 {
9841         struct kvm_run *run = vcpu->run;
9842         struct kvm_mmio_fragment *frag;
9843         unsigned len;
9844
9845         BUG_ON(!vcpu->mmio_needed);
9846
9847         /* Complete previous fragment */
9848         frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
9849         len = min(8u, frag->len);
9850         if (!vcpu->mmio_is_write)
9851                 memcpy(frag->data, run->mmio.data, len);
9852
9853         if (frag->len <= 8) {
9854                 /* Switch to the next fragment. */
9855                 frag++;
9856                 vcpu->mmio_cur_fragment++;
9857         } else {
9858                 /* Go forward to the next mmio piece. */
9859                 frag->data += len;
9860                 frag->gpa += len;
9861                 frag->len -= len;
9862         }
9863
9864         if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
9865                 vcpu->mmio_needed = 0;
9866
9867                 /* FIXME: return into emulator if single-stepping.  */
9868                 if (vcpu->mmio_is_write)
9869                         return 1;
9870                 vcpu->mmio_read_completed = 1;
9871                 return complete_emulated_io(vcpu);
9872         }
9873
9874         run->exit_reason = KVM_EXIT_MMIO;
9875         run->mmio.phys_addr = frag->gpa;
9876         if (vcpu->mmio_is_write)
9877                 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
9878         run->mmio.len = min(8u, frag->len);
9879         run->mmio.is_write = vcpu->mmio_is_write;
9880         vcpu->arch.complete_userspace_io = complete_emulated_mmio;
9881         return 0;
9882 }
9883
9884 static void kvm_save_current_fpu(struct fpu *fpu)
9885 {
9886         /*
9887          * If the target FPU state is not resident in the CPU registers, just
9888          * memcpy() from current, else save CPU state directly to the target.
9889          */
9890         if (test_thread_flag(TIF_NEED_FPU_LOAD))
9891                 memcpy(&fpu->state, &current->thread.fpu.state,
9892                        fpu_kernel_xstate_size);
9893         else
9894                 save_fpregs_to_fpstate(fpu);
9895 }
9896
9897 /* Swap (qemu) user FPU context for the guest FPU context. */
9898 static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
9899 {
9900         fpregs_lock();
9901
9902         kvm_save_current_fpu(vcpu->arch.user_fpu);
9903
9904         /*
9905          * Guests with protected state can't have it set by the hypervisor,
9906          * so skip trying to set it.
9907          */
9908         if (vcpu->arch.guest_fpu)
9909                 /* PKRU is separately restored in kvm_x86_ops.run. */
9910                 __restore_fpregs_from_fpstate(&vcpu->arch.guest_fpu->state,
9911                                         ~XFEATURE_MASK_PKRU);
9912
9913         fpregs_mark_activate();
9914         fpregs_unlock();
9915
9916         trace_kvm_fpu(1);
9917 }
9918
9919 /* When vcpu_run ends, restore user space FPU context. */
9920 static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
9921 {
9922         fpregs_lock();
9923
9924         /*
9925          * Guests with protected state can't have it read by the hypervisor,
9926          * so skip trying to save it.
9927          */
9928         if (vcpu->arch.guest_fpu)
9929                 kvm_save_current_fpu(vcpu->arch.guest_fpu);
9930
9931         restore_fpregs_from_fpstate(&vcpu->arch.user_fpu->state);
9932
9933         fpregs_mark_activate();
9934         fpregs_unlock();
9935
9936         ++vcpu->stat.fpu_reload;
9937         trace_kvm_fpu(0);
9938 }
9939
9940 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
9941 {
9942         struct kvm_run *kvm_run = vcpu->run;
9943         int r;
9944
9945         vcpu_load(vcpu);
9946         kvm_sigset_activate(vcpu);
9947         kvm_run->flags = 0;
9948         kvm_load_guest_fpu(vcpu);
9949
9950         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
9951                 if (kvm_run->immediate_exit) {
9952                         r = -EINTR;
9953                         goto out;
9954                 }
9955                 kvm_vcpu_block(vcpu);
9956                 if (kvm_apic_accept_events(vcpu) < 0) {
9957                         r = 0;
9958                         goto out;
9959                 }
9960                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
9961                 r = -EAGAIN;
9962                 if (signal_pending(current)) {
9963                         r = -EINTR;
9964                         kvm_run->exit_reason = KVM_EXIT_INTR;
9965                         ++vcpu->stat.signal_exits;
9966                 }
9967                 goto out;
9968         }
9969
9970         if (kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) {
9971                 r = -EINVAL;
9972                 goto out;
9973         }
9974
9975         if (kvm_run->kvm_dirty_regs) {
9976                 r = sync_regs(vcpu);
9977                 if (r != 0)
9978                         goto out;
9979         }
9980
9981         /* re-sync apic's tpr */
9982         if (!lapic_in_kernel(vcpu)) {
9983                 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
9984                         r = -EINVAL;
9985                         goto out;
9986                 }
9987         }
9988
9989         if (unlikely(vcpu->arch.complete_userspace_io)) {
9990                 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
9991                 vcpu->arch.complete_userspace_io = NULL;
9992                 r = cui(vcpu);
9993                 if (r <= 0)
9994                         goto out;
9995         } else
9996                 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
9997
9998         if (kvm_run->immediate_exit)
9999                 r = -EINTR;
10000         else
10001                 r = vcpu_run(vcpu);
10002
10003 out:
10004         kvm_put_guest_fpu(vcpu);
10005         if (kvm_run->kvm_valid_regs)
10006                 store_regs(vcpu);
10007         post_kvm_run_save(vcpu);
10008         kvm_sigset_deactivate(vcpu);
10009
10010         vcpu_put(vcpu);
10011         return r;
10012 }
10013
10014 static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10015 {
10016         if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
10017                 /*
10018                  * We are here if userspace calls get_regs() in the middle of
10019                  * instruction emulation. Registers state needs to be copied
10020                  * back from emulation context to vcpu. Userspace shouldn't do
10021                  * that usually, but some bad designed PV devices (vmware
10022                  * backdoor interface) need this to work
10023                  */
10024                 emulator_writeback_register_cache(vcpu->arch.emulate_ctxt);
10025                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
10026         }
10027         regs->rax = kvm_rax_read(vcpu);
10028         regs->rbx = kvm_rbx_read(vcpu);
10029         regs->rcx = kvm_rcx_read(vcpu);
10030         regs->rdx = kvm_rdx_read(vcpu);
10031         regs->rsi = kvm_rsi_read(vcpu);
10032         regs->rdi = kvm_rdi_read(vcpu);
10033         regs->rsp = kvm_rsp_read(vcpu);
10034         regs->rbp = kvm_rbp_read(vcpu);
10035 #ifdef CONFIG_X86_64
10036         regs->r8 = kvm_r8_read(vcpu);
10037         regs->r9 = kvm_r9_read(vcpu);
10038         regs->r10 = kvm_r10_read(vcpu);
10039         regs->r11 = kvm_r11_read(vcpu);
10040         regs->r12 = kvm_r12_read(vcpu);
10041         regs->r13 = kvm_r13_read(vcpu);
10042         regs->r14 = kvm_r14_read(vcpu);
10043         regs->r15 = kvm_r15_read(vcpu);
10044 #endif
10045
10046         regs->rip = kvm_rip_read(vcpu);
10047         regs->rflags = kvm_get_rflags(vcpu);
10048 }
10049
10050 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10051 {
10052         vcpu_load(vcpu);
10053         __get_regs(vcpu, regs);
10054         vcpu_put(vcpu);
10055         return 0;
10056 }
10057
10058 static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10059 {
10060         vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
10061         vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
10062
10063         kvm_rax_write(vcpu, regs->rax);
10064         kvm_rbx_write(vcpu, regs->rbx);
10065         kvm_rcx_write(vcpu, regs->rcx);
10066         kvm_rdx_write(vcpu, regs->rdx);
10067         kvm_rsi_write(vcpu, regs->rsi);
10068         kvm_rdi_write(vcpu, regs->rdi);
10069         kvm_rsp_write(vcpu, regs->rsp);
10070         kvm_rbp_write(vcpu, regs->rbp);
10071 #ifdef CONFIG_X86_64
10072         kvm_r8_write(vcpu, regs->r8);
10073         kvm_r9_write(vcpu, regs->r9);
10074         kvm_r10_write(vcpu, regs->r10);
10075         kvm_r11_write(vcpu, regs->r11);
10076         kvm_r12_write(vcpu, regs->r12);
10077         kvm_r13_write(vcpu, regs->r13);
10078         kvm_r14_write(vcpu, regs->r14);
10079         kvm_r15_write(vcpu, regs->r15);
10080 #endif
10081
10082         kvm_rip_write(vcpu, regs->rip);
10083         kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED);
10084
10085         vcpu->arch.exception.pending = false;
10086
10087         kvm_make_request(KVM_REQ_EVENT, vcpu);
10088 }
10089
10090 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10091 {
10092         vcpu_load(vcpu);
10093         __set_regs(vcpu, regs);
10094         vcpu_put(vcpu);
10095         return 0;
10096 }
10097
10098 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
10099 {
10100         struct kvm_segment cs;
10101
10102         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
10103         *db = cs.db;
10104         *l = cs.l;
10105 }
10106 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
10107
10108 static void __get_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
10109 {
10110         struct desc_ptr dt;
10111
10112         if (vcpu->arch.guest_state_protected)
10113                 goto skip_protected_regs;
10114
10115         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
10116         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
10117         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
10118         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
10119         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
10120         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
10121
10122         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
10123         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
10124
10125         static_call(kvm_x86_get_idt)(vcpu, &dt);
10126         sregs->idt.limit = dt.size;
10127         sregs->idt.base = dt.address;
10128         static_call(kvm_x86_get_gdt)(vcpu, &dt);
10129         sregs->gdt.limit = dt.size;
10130         sregs->gdt.base = dt.address;
10131
10132         sregs->cr2 = vcpu->arch.cr2;
10133         sregs->cr3 = kvm_read_cr3(vcpu);
10134
10135 skip_protected_regs:
10136         sregs->cr0 = kvm_read_cr0(vcpu);
10137         sregs->cr4 = kvm_read_cr4(vcpu);
10138         sregs->cr8 = kvm_get_cr8(vcpu);
10139         sregs->efer = vcpu->arch.efer;
10140         sregs->apic_base = kvm_get_apic_base(vcpu);
10141 }
10142
10143 static void __get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
10144 {
10145         __get_sregs_common(vcpu, sregs);
10146
10147         if (vcpu->arch.guest_state_protected)
10148                 return;
10149
10150         if (vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft)
10151                 set_bit(vcpu->arch.interrupt.nr,
10152                         (unsigned long *)sregs->interrupt_bitmap);
10153 }
10154
10155 static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)
10156 {
10157         int i;
10158
10159         __get_sregs_common(vcpu, (struct kvm_sregs *)sregs2);
10160
10161         if (vcpu->arch.guest_state_protected)
10162                 return;
10163
10164         if (is_pae_paging(vcpu)) {
10165                 for (i = 0 ; i < 4 ; i++)
10166                         sregs2->pdptrs[i] = kvm_pdptr_read(vcpu, i);
10167                 sregs2->flags |= KVM_SREGS2_FLAGS_PDPTRS_VALID;
10168         }
10169 }
10170
10171 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
10172                                   struct kvm_sregs *sregs)
10173 {
10174         vcpu_load(vcpu);
10175         __get_sregs(vcpu, sregs);
10176         vcpu_put(vcpu);
10177         return 0;
10178 }
10179
10180 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
10181                                     struct kvm_mp_state *mp_state)
10182 {
10183         int r;
10184
10185         vcpu_load(vcpu);
10186         if (kvm_mpx_supported())
10187                 kvm_load_guest_fpu(vcpu);
10188
10189         r = kvm_apic_accept_events(vcpu);
10190         if (r < 0)
10191                 goto out;
10192         r = 0;
10193
10194         if ((vcpu->arch.mp_state == KVM_MP_STATE_HALTED ||
10195              vcpu->arch.mp_state == KVM_MP_STATE_AP_RESET_HOLD) &&
10196             vcpu->arch.pv.pv_unhalted)
10197                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
10198         else
10199                 mp_state->mp_state = vcpu->arch.mp_state;
10200
10201 out:
10202         if (kvm_mpx_supported())
10203                 kvm_put_guest_fpu(vcpu);
10204         vcpu_put(vcpu);
10205         return r;
10206 }
10207
10208 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
10209                                     struct kvm_mp_state *mp_state)
10210 {
10211         int ret = -EINVAL;
10212
10213         vcpu_load(vcpu);
10214
10215         if (!lapic_in_kernel(vcpu) &&
10216             mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
10217                 goto out;
10218
10219         /*
10220          * KVM_MP_STATE_INIT_RECEIVED means the processor is in
10221          * INIT state; latched init should be reported using
10222          * KVM_SET_VCPU_EVENTS, so reject it here.
10223          */
10224         if ((kvm_vcpu_latch_init(vcpu) || vcpu->arch.smi_pending) &&
10225             (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
10226              mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
10227                 goto out;
10228
10229         if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
10230                 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
10231                 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);
10232         } else
10233                 vcpu->arch.mp_state = mp_state->mp_state;
10234         kvm_make_request(KVM_REQ_EVENT, vcpu);
10235
10236         ret = 0;
10237 out:
10238         vcpu_put(vcpu);
10239         return ret;
10240 }
10241
10242 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
10243                     int reason, bool has_error_code, u32 error_code)
10244 {
10245         struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
10246         int ret;
10247
10248         init_emulate_ctxt(vcpu);
10249
10250         ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
10251                                    has_error_code, error_code);
10252         if (ret) {
10253                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
10254                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
10255                 vcpu->run->internal.ndata = 0;
10256                 return 0;
10257         }
10258
10259         kvm_rip_write(vcpu, ctxt->eip);
10260         kvm_set_rflags(vcpu, ctxt->eflags);
10261         return 1;
10262 }
10263 EXPORT_SYMBOL_GPL(kvm_task_switch);
10264
10265 static bool kvm_is_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
10266 {
10267         if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) {
10268                 /*
10269                  * When EFER.LME and CR0.PG are set, the processor is in
10270                  * 64-bit mode (though maybe in a 32-bit code segment).
10271                  * CR4.PAE and EFER.LMA must be set.
10272                  */
10273                 if (!(sregs->cr4 & X86_CR4_PAE) || !(sregs->efer & EFER_LMA))
10274                         return false;
10275                 if (kvm_vcpu_is_illegal_gpa(vcpu, sregs->cr3))
10276                         return false;
10277         } else {
10278                 /*
10279                  * Not in 64-bit mode: EFER.LMA is clear and the code
10280                  * segment cannot be 64-bit.
10281                  */
10282                 if (sregs->efer & EFER_LMA || sregs->cs.l)
10283                         return false;
10284         }
10285
10286         return kvm_is_valid_cr4(vcpu, sregs->cr4);
10287 }
10288
10289 static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
10290                 int *mmu_reset_needed, bool update_pdptrs)
10291 {
10292         struct msr_data apic_base_msr;
10293         int idx;
10294         struct desc_ptr dt;
10295
10296         if (!kvm_is_valid_sregs(vcpu, sregs))
10297                 return -EINVAL;
10298
10299         apic_base_msr.data = sregs->apic_base;
10300         apic_base_msr.host_initiated = true;
10301         if (kvm_set_apic_base(vcpu, &apic_base_msr))
10302                 return -EINVAL;
10303
10304         if (vcpu->arch.guest_state_protected)
10305                 return 0;
10306
10307         dt.size = sregs->idt.limit;
10308         dt.address = sregs->idt.base;
10309         static_call(kvm_x86_set_idt)(vcpu, &dt);
10310         dt.size = sregs->gdt.limit;
10311         dt.address = sregs->gdt.base;
10312         static_call(kvm_x86_set_gdt)(vcpu, &dt);
10313
10314         vcpu->arch.cr2 = sregs->cr2;
10315         *mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
10316         vcpu->arch.cr3 = sregs->cr3;
10317         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
10318
10319         kvm_set_cr8(vcpu, sregs->cr8);
10320
10321         *mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
10322         static_call(kvm_x86_set_efer)(vcpu, sregs->efer);
10323
10324         *mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
10325         static_call(kvm_x86_set_cr0)(vcpu, sregs->cr0);
10326         vcpu->arch.cr0 = sregs->cr0;
10327
10328         *mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
10329         static_call(kvm_x86_set_cr4)(vcpu, sregs->cr4);
10330
10331         if (update_pdptrs) {
10332                 idx = srcu_read_lock(&vcpu->kvm->srcu);
10333                 if (is_pae_paging(vcpu)) {
10334                         load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
10335                         *mmu_reset_needed = 1;
10336                 }
10337                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
10338         }
10339
10340         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
10341         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
10342         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
10343         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
10344         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
10345         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
10346
10347         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
10348         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
10349
10350         update_cr8_intercept(vcpu);
10351
10352         /* Older userspace won't unhalt the vcpu on reset. */
10353         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
10354             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
10355             !is_protmode(vcpu))
10356                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
10357
10358         return 0;
10359 }
10360
10361 static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
10362 {
10363         int pending_vec, max_bits;
10364         int mmu_reset_needed = 0;
10365         int ret = __set_sregs_common(vcpu, sregs, &mmu_reset_needed, true);
10366
10367         if (ret)
10368                 return ret;
10369
10370         if (mmu_reset_needed)
10371                 kvm_mmu_reset_context(vcpu);
10372
10373         max_bits = KVM_NR_INTERRUPTS;
10374         pending_vec = find_first_bit(
10375                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
10376
10377         if (pending_vec < max_bits) {
10378                 kvm_queue_interrupt(vcpu, pending_vec, false);
10379                 pr_debug("Set back pending irq %d\n", pending_vec);
10380                 kvm_make_request(KVM_REQ_EVENT, vcpu);
10381         }
10382         return 0;
10383 }
10384
10385 static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)
10386 {
10387         int mmu_reset_needed = 0;
10388         bool valid_pdptrs = sregs2->flags & KVM_SREGS2_FLAGS_PDPTRS_VALID;
10389         bool pae = (sregs2->cr0 & X86_CR0_PG) && (sregs2->cr4 & X86_CR4_PAE) &&
10390                 !(sregs2->efer & EFER_LMA);
10391         int i, ret;
10392
10393         if (sregs2->flags & ~KVM_SREGS2_FLAGS_PDPTRS_VALID)
10394                 return -EINVAL;
10395
10396         if (valid_pdptrs && (!pae || vcpu->arch.guest_state_protected))
10397                 return -EINVAL;
10398
10399         ret = __set_sregs_common(vcpu, (struct kvm_sregs *)sregs2,
10400                                  &mmu_reset_needed, !valid_pdptrs);
10401         if (ret)
10402                 return ret;
10403
10404         if (valid_pdptrs) {
10405                 for (i = 0; i < 4 ; i++)
10406                         kvm_pdptr_write(vcpu, i, sregs2->pdptrs[i]);
10407
10408                 kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
10409                 mmu_reset_needed = 1;
10410                 vcpu->arch.pdptrs_from_userspace = true;
10411         }
10412         if (mmu_reset_needed)
10413                 kvm_mmu_reset_context(vcpu);
10414         return 0;
10415 }
10416
10417 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
10418                                   struct kvm_sregs *sregs)
10419 {
10420         int ret;
10421
10422         vcpu_load(vcpu);
10423         ret = __set_sregs(vcpu, sregs);
10424         vcpu_put(vcpu);
10425         return ret;
10426 }
10427
10428 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
10429                                         struct kvm_guest_debug *dbg)
10430 {
10431         unsigned long rflags;
10432         int i, r;
10433
10434         if (vcpu->arch.guest_state_protected)
10435                 return -EINVAL;
10436
10437         vcpu_load(vcpu);
10438
10439         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
10440                 r = -EBUSY;
10441                 if (vcpu->arch.exception.pending)
10442                         goto out;
10443                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
10444                         kvm_queue_exception(vcpu, DB_VECTOR);
10445                 else
10446                         kvm_queue_exception(vcpu, BP_VECTOR);
10447         }
10448
10449         /*
10450          * Read rflags as long as potentially injected trace flags are still
10451          * filtered out.
10452          */
10453         rflags = kvm_get_rflags(vcpu);
10454
10455         vcpu->guest_debug = dbg->control;
10456         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
10457                 vcpu->guest_debug = 0;
10458
10459         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
10460                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
10461                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
10462                 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7];
10463         } else {
10464                 for (i = 0; i < KVM_NR_DB_REGS; i++)
10465                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
10466         }
10467         kvm_update_dr7(vcpu);
10468
10469         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
10470                 vcpu->arch.singlestep_rip = kvm_get_linear_rip(vcpu);
10471
10472         /*
10473          * Trigger an rflags update that will inject or remove the trace
10474          * flags.
10475          */
10476         kvm_set_rflags(vcpu, rflags);
10477
10478         static_call(kvm_x86_update_exception_bitmap)(vcpu);
10479
10480         r = 0;
10481
10482 out:
10483         vcpu_put(vcpu);
10484         return r;
10485 }
10486
10487 /*
10488  * Translate a guest virtual address to a guest physical address.
10489  */
10490 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
10491                                     struct kvm_translation *tr)
10492 {
10493         unsigned long vaddr = tr->linear_address;
10494         gpa_t gpa;
10495         int idx;
10496
10497         vcpu_load(vcpu);
10498
10499         idx = srcu_read_lock(&vcpu->kvm->srcu);
10500         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
10501         srcu_read_unlock(&vcpu->kvm->srcu, idx);
10502         tr->physical_address = gpa;
10503         tr->valid = gpa != UNMAPPED_GVA;
10504         tr->writeable = 1;
10505         tr->usermode = 0;
10506
10507         vcpu_put(vcpu);
10508         return 0;
10509 }
10510
10511 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
10512 {
10513         struct fxregs_state *fxsave;
10514
10515         if (!vcpu->arch.guest_fpu)
10516                 return 0;
10517
10518         vcpu_load(vcpu);
10519
10520         fxsave = &vcpu->arch.guest_fpu->state.fxsave;
10521         memcpy(fpu->fpr, fxsave->st_space, 128);
10522         fpu->fcw = fxsave->cwd;
10523         fpu->fsw = fxsave->swd;
10524         fpu->ftwx = fxsave->twd;
10525         fpu->last_opcode = fxsave->fop;
10526         fpu->last_ip = fxsave->rip;
10527         fpu->last_dp = fxsave->rdp;
10528         memcpy(fpu->xmm, fxsave->xmm_space, sizeof(fxsave->xmm_space));
10529
10530         vcpu_put(vcpu);
10531         return 0;
10532 }
10533
10534 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
10535 {
10536         struct fxregs_state *fxsave;
10537
10538         if (!vcpu->arch.guest_fpu)
10539                 return 0;
10540
10541         vcpu_load(vcpu);
10542
10543         fxsave = &vcpu->arch.guest_fpu->state.fxsave;
10544
10545         memcpy(fxsave->st_space, fpu->fpr, 128);
10546         fxsave->cwd = fpu->fcw;
10547         fxsave->swd = fpu->fsw;
10548         fxsave->twd = fpu->ftwx;
10549         fxsave->fop = fpu->last_opcode;
10550         fxsave->rip = fpu->last_ip;
10551         fxsave->rdp = fpu->last_dp;
10552         memcpy(fxsave->xmm_space, fpu->xmm, sizeof(fxsave->xmm_space));
10553
10554         vcpu_put(vcpu);
10555         return 0;
10556 }
10557
10558 static void store_regs(struct kvm_vcpu *vcpu)
10559 {
10560         BUILD_BUG_ON(sizeof(struct kvm_sync_regs) > SYNC_REGS_SIZE_BYTES);
10561
10562         if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_REGS)
10563                 __get_regs(vcpu, &vcpu->run->s.regs.regs);
10564
10565         if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_SREGS)
10566                 __get_sregs(vcpu, &vcpu->run->s.regs.sregs);
10567
10568         if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_EVENTS)
10569                 kvm_vcpu_ioctl_x86_get_vcpu_events(
10570                                 vcpu, &vcpu->run->s.regs.events);
10571 }
10572
10573 static int sync_regs(struct kvm_vcpu *vcpu)
10574 {
10575         if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS)
10576                 return -EINVAL;
10577
10578         if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) {
10579                 __set_regs(vcpu, &vcpu->run->s.regs.regs);
10580                 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS;
10581         }
10582         if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_SREGS) {
10583                 if (__set_sregs(vcpu, &vcpu->run->s.regs.sregs))
10584                         return -EINVAL;
10585                 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_SREGS;
10586         }
10587         if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_EVENTS) {
10588                 if (kvm_vcpu_ioctl_x86_set_vcpu_events(
10589                                 vcpu, &vcpu->run->s.regs.events))
10590                         return -EINVAL;
10591                 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_EVENTS;
10592         }
10593
10594         return 0;
10595 }
10596
10597 static void fx_init(struct kvm_vcpu *vcpu)
10598 {
10599         if (!vcpu->arch.guest_fpu)
10600                 return;
10601
10602         fpstate_init(&vcpu->arch.guest_fpu->state);
10603         if (boot_cpu_has(X86_FEATURE_XSAVES))
10604                 vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv =
10605                         host_xcr0 | XSTATE_COMPACTION_ENABLED;
10606
10607         /*
10608          * Ensure guest xcr0 is valid for loading
10609          */
10610         vcpu->arch.xcr0 = XFEATURE_MASK_FP;
10611
10612         vcpu->arch.cr0 |= X86_CR0_ET;
10613 }
10614
10615 void kvm_free_guest_fpu(struct kvm_vcpu *vcpu)
10616 {
10617         if (vcpu->arch.guest_fpu) {
10618                 kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
10619                 vcpu->arch.guest_fpu = NULL;
10620         }
10621 }
10622 EXPORT_SYMBOL_GPL(kvm_free_guest_fpu);
10623
10624 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
10625 {
10626         if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
10627                 pr_warn_once("kvm: SMP vm created on host with unstable TSC; "
10628                              "guest TSC will not be reliable\n");
10629
10630         return 0;
10631 }
10632
10633 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
10634 {
10635         struct page *page;
10636         int r;
10637
10638         vcpu->arch.last_vmentry_cpu = -1;
10639
10640         if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu))
10641                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
10642         else
10643                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
10644
10645         r = kvm_mmu_create(vcpu);
10646         if (r < 0)
10647                 return r;
10648
10649         if (irqchip_in_kernel(vcpu->kvm)) {
10650                 r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
10651                 if (r < 0)
10652                         goto fail_mmu_destroy;
10653                 if (kvm_apicv_activated(vcpu->kvm))
10654                         vcpu->arch.apicv_active = true;
10655         } else
10656                 static_branch_inc(&kvm_has_noapic_vcpu);
10657
10658         r = -ENOMEM;
10659
10660         page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
10661         if (!page)
10662                 goto fail_free_lapic;
10663         vcpu->arch.pio_data = page_address(page);
10664
10665         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
10666                                        GFP_KERNEL_ACCOUNT);
10667         if (!vcpu->arch.mce_banks)
10668                 goto fail_free_pio_data;
10669         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
10670
10671         if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
10672                                 GFP_KERNEL_ACCOUNT))
10673                 goto fail_free_mce_banks;
10674
10675         if (!alloc_emulate_ctxt(vcpu))
10676                 goto free_wbinvd_dirty_mask;
10677
10678         vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
10679                                                 GFP_KERNEL_ACCOUNT);
10680         if (!vcpu->arch.user_fpu) {
10681                 pr_err("kvm: failed to allocate userspace's fpu\n");
10682                 goto free_emulate_ctxt;
10683         }
10684
10685         vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
10686                                                  GFP_KERNEL_ACCOUNT);
10687         if (!vcpu->arch.guest_fpu) {
10688                 pr_err("kvm: failed to allocate vcpu's fpu\n");
10689                 goto free_user_fpu;
10690         }
10691         fx_init(vcpu);
10692
10693         vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
10694         vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
10695
10696         vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
10697
10698         kvm_async_pf_hash_reset(vcpu);
10699         kvm_pmu_init(vcpu);
10700
10701         vcpu->arch.pending_external_vector = -1;
10702         vcpu->arch.preempted_in_kernel = false;
10703
10704 #if IS_ENABLED(CONFIG_HYPERV)
10705         vcpu->arch.hv_root_tdp = INVALID_PAGE;
10706 #endif
10707
10708         r = static_call(kvm_x86_vcpu_create)(vcpu);
10709         if (r)
10710                 goto free_guest_fpu;
10711
10712         vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
10713         vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
10714         kvm_vcpu_mtrr_init(vcpu);
10715         vcpu_load(vcpu);
10716         kvm_set_tsc_khz(vcpu, max_tsc_khz);
10717         kvm_vcpu_reset(vcpu, false);
10718         kvm_init_mmu(vcpu);
10719         vcpu_put(vcpu);
10720         return 0;
10721
10722 free_guest_fpu:
10723         kvm_free_guest_fpu(vcpu);
10724 free_user_fpu:
10725         kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
10726 free_emulate_ctxt:
10727         kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt);
10728 free_wbinvd_dirty_mask:
10729         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
10730 fail_free_mce_banks:
10731         kfree(vcpu->arch.mce_banks);
10732 fail_free_pio_data:
10733         free_page((unsigned long)vcpu->arch.pio_data);
10734 fail_free_lapic:
10735         kvm_free_lapic(vcpu);
10736 fail_mmu_destroy:
10737         kvm_mmu_destroy(vcpu);
10738         return r;
10739 }
10740
10741 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
10742 {
10743         struct kvm *kvm = vcpu->kvm;
10744
10745         if (mutex_lock_killable(&vcpu->mutex))
10746                 return;
10747         vcpu_load(vcpu);
10748         kvm_synchronize_tsc(vcpu, 0);
10749         vcpu_put(vcpu);
10750
10751         /* poll control enabled by default */
10752         vcpu->arch.msr_kvm_poll_control = 1;
10753
10754         mutex_unlock(&vcpu->mutex);
10755
10756         if (kvmclock_periodic_sync && vcpu->vcpu_idx == 0)
10757                 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
10758                                                 KVMCLOCK_SYNC_PERIOD);
10759 }
10760
10761 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
10762 {
10763         struct gfn_to_pfn_cache *cache = &vcpu->arch.st.cache;
10764         int idx;
10765
10766         kvm_release_pfn(cache->pfn, cache->dirty, cache);
10767
10768         kvmclock_reset(vcpu);
10769
10770         static_call(kvm_x86_vcpu_free)(vcpu);
10771
10772         kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt);
10773         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
10774         kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
10775         kvm_free_guest_fpu(vcpu);
10776
10777         kvm_hv_vcpu_uninit(vcpu);
10778         kvm_pmu_destroy(vcpu);
10779         kfree(vcpu->arch.mce_banks);
10780         kvm_free_lapic(vcpu);
10781         idx = srcu_read_lock(&vcpu->kvm->srcu);
10782         kvm_mmu_destroy(vcpu);
10783         srcu_read_unlock(&vcpu->kvm->srcu, idx);
10784         free_page((unsigned long)vcpu->arch.pio_data);
10785         kvfree(vcpu->arch.cpuid_entries);
10786         if (!lapic_in_kernel(vcpu))
10787                 static_branch_dec(&kvm_has_noapic_vcpu);
10788 }
10789
10790 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
10791 {
10792         unsigned long old_cr0 = kvm_read_cr0(vcpu);
10793
10794         kvm_lapic_reset(vcpu, init_event);
10795
10796         vcpu->arch.hflags = 0;
10797
10798         vcpu->arch.smi_pending = 0;
10799         vcpu->arch.smi_count = 0;
10800         atomic_set(&vcpu->arch.nmi_queued, 0);
10801         vcpu->arch.nmi_pending = 0;
10802         vcpu->arch.nmi_injected = false;
10803         kvm_clear_interrupt_queue(vcpu);
10804         kvm_clear_exception_queue(vcpu);
10805
10806         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
10807         kvm_update_dr0123(vcpu);
10808         vcpu->arch.dr6 = DR6_ACTIVE_LOW;
10809         vcpu->arch.dr7 = DR7_FIXED_1;
10810         kvm_update_dr7(vcpu);
10811
10812         vcpu->arch.cr2 = 0;
10813
10814         kvm_make_request(KVM_REQ_EVENT, vcpu);
10815         vcpu->arch.apf.msr_en_val = 0;
10816         vcpu->arch.apf.msr_int_val = 0;
10817         vcpu->arch.st.msr_val = 0;
10818
10819         kvmclock_reset(vcpu);
10820
10821         kvm_clear_async_pf_completion_queue(vcpu);
10822         kvm_async_pf_hash_reset(vcpu);
10823         vcpu->arch.apf.halted = false;
10824
10825         if (vcpu->arch.guest_fpu && kvm_mpx_supported()) {
10826                 void *mpx_state_buffer;
10827
10828                 /*
10829                  * To avoid have the INIT path from kvm_apic_has_events() that be
10830                  * called with loaded FPU and does not let userspace fix the state.
10831                  */
10832                 if (init_event)
10833                         kvm_put_guest_fpu(vcpu);
10834                 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave,
10835                                         XFEATURE_BNDREGS);
10836                 if (mpx_state_buffer)
10837                         memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state));
10838                 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave,
10839                                         XFEATURE_BNDCSR);
10840                 if (mpx_state_buffer)
10841                         memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr));
10842                 if (init_event)
10843                         kvm_load_guest_fpu(vcpu);
10844         }
10845
10846         if (!init_event) {
10847                 kvm_pmu_reset(vcpu);
10848                 vcpu->arch.smbase = 0x30000;
10849
10850                 vcpu->arch.msr_misc_features_enables = 0;
10851
10852                 vcpu->arch.xcr0 = XFEATURE_MASK_FP;
10853         }
10854
10855         memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
10856         vcpu->arch.regs_avail = ~0;
10857         vcpu->arch.regs_dirty = ~0;
10858
10859         vcpu->arch.ia32_xss = 0;
10860
10861         static_call(kvm_x86_vcpu_reset)(vcpu, init_event);
10862
10863         /*
10864          * Reset the MMU context if paging was enabled prior to INIT (which is
10865          * implied if CR0.PG=1 as CR0 will be '0' prior to RESET).  Unlike the
10866          * standard CR0/CR4/EFER modification paths, only CR0.PG needs to be
10867          * checked because it is unconditionally cleared on INIT and all other
10868          * paging related bits are ignored if paging is disabled, i.e. CR0.WP,
10869          * CR4, and EFER changes are all irrelevant if CR0.PG was '0'.
10870          */
10871         if (old_cr0 & X86_CR0_PG)
10872                 kvm_mmu_reset_context(vcpu);
10873 }
10874
10875 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
10876 {
10877         struct kvm_segment cs;
10878
10879         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
10880         cs.selector = vector << 8;
10881         cs.base = vector << 12;
10882         kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
10883         kvm_rip_write(vcpu, 0);
10884 }
10885 EXPORT_SYMBOL_GPL(kvm_vcpu_deliver_sipi_vector);
10886
10887 int kvm_arch_hardware_enable(void)
10888 {
10889         struct kvm *kvm;
10890         struct kvm_vcpu *vcpu;
10891         int i;
10892         int ret;
10893         u64 local_tsc;
10894         u64 max_tsc = 0;
10895         bool stable, backwards_tsc = false;
10896
10897         kvm_user_return_msr_cpu_online();
10898         ret = static_call(kvm_x86_hardware_enable)();
10899         if (ret != 0)
10900                 return ret;
10901
10902         local_tsc = rdtsc();
10903         stable = !kvm_check_tsc_unstable();
10904         list_for_each_entry(kvm, &vm_list, vm_list) {
10905                 kvm_for_each_vcpu(i, vcpu, kvm) {
10906                         if (!stable && vcpu->cpu == smp_processor_id())
10907                                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
10908                         if (stable && vcpu->arch.last_host_tsc > local_tsc) {
10909                                 backwards_tsc = true;
10910                                 if (vcpu->arch.last_host_tsc > max_tsc)
10911                                         max_tsc = vcpu->arch.last_host_tsc;
10912                         }
10913                 }
10914         }
10915
10916         /*
10917          * Sometimes, even reliable TSCs go backwards.  This happens on
10918          * platforms that reset TSC during suspend or hibernate actions, but
10919          * maintain synchronization.  We must compensate.  Fortunately, we can
10920          * detect that condition here, which happens early in CPU bringup,
10921          * before any KVM threads can be running.  Unfortunately, we can't
10922          * bring the TSCs fully up to date with real time, as we aren't yet far
10923          * enough into CPU bringup that we know how much real time has actually
10924          * elapsed; our helper function, ktime_get_boottime_ns() will be using boot
10925          * variables that haven't been updated yet.
10926          *
10927          * So we simply find the maximum observed TSC above, then record the
10928          * adjustment to TSC in each VCPU.  When the VCPU later gets loaded,
10929          * the adjustment will be applied.  Note that we accumulate
10930          * adjustments, in case multiple suspend cycles happen before some VCPU
10931          * gets a chance to run again.  In the event that no KVM threads get a
10932          * chance to run, we will miss the entire elapsed period, as we'll have
10933          * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
10934          * loose cycle time.  This isn't too big a deal, since the loss will be
10935          * uniform across all VCPUs (not to mention the scenario is extremely
10936          * unlikely). It is possible that a second hibernate recovery happens
10937          * much faster than a first, causing the observed TSC here to be
10938          * smaller; this would require additional padding adjustment, which is
10939          * why we set last_host_tsc to the local tsc observed here.
10940          *
10941          * N.B. - this code below runs only on platforms with reliable TSC,
10942          * as that is the only way backwards_tsc is set above.  Also note
10943          * that this runs for ALL vcpus, which is not a bug; all VCPUs should
10944          * have the same delta_cyc adjustment applied if backwards_tsc
10945          * is detected.  Note further, this adjustment is only done once,
10946          * as we reset last_host_tsc on all VCPUs to stop this from being
10947          * called multiple times (one for each physical CPU bringup).
10948          *
10949          * Platforms with unreliable TSCs don't have to deal with this, they
10950          * will be compensated by the logic in vcpu_load, which sets the TSC to
10951          * catchup mode.  This will catchup all VCPUs to real time, but cannot
10952          * guarantee that they stay in perfect synchronization.
10953          */
10954         if (backwards_tsc) {
10955                 u64 delta_cyc = max_tsc - local_tsc;
10956                 list_for_each_entry(kvm, &vm_list, vm_list) {
10957                         kvm->arch.backwards_tsc_observed = true;
10958                         kvm_for_each_vcpu(i, vcpu, kvm) {
10959                                 vcpu->arch.tsc_offset_adjustment += delta_cyc;
10960                                 vcpu->arch.last_host_tsc = local_tsc;
10961                                 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
10962                         }
10963
10964                         /*
10965                          * We have to disable TSC offset matching.. if you were
10966                          * booting a VM while issuing an S4 host suspend....
10967                          * you may have some problem.  Solving this issue is
10968                          * left as an exercise to the reader.
10969                          */
10970                         kvm->arch.last_tsc_nsec = 0;
10971                         kvm->arch.last_tsc_write = 0;
10972                 }
10973
10974         }
10975         return 0;
10976 }
10977
10978 void kvm_arch_hardware_disable(void)
10979 {
10980         static_call(kvm_x86_hardware_disable)();
10981         drop_user_return_notifiers();
10982 }
10983
10984 int kvm_arch_hardware_setup(void *opaque)
10985 {
10986         struct kvm_x86_init_ops *ops = opaque;
10987         int r;
10988
10989         rdmsrl_safe(MSR_EFER, &host_efer);
10990
10991         if (boot_cpu_has(X86_FEATURE_XSAVES))
10992                 rdmsrl(MSR_IA32_XSS, host_xss);
10993
10994         r = ops->hardware_setup();
10995         if (r != 0)
10996                 return r;
10997
10998         memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops));
10999         kvm_ops_static_call_update();
11000
11001         if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
11002                 supported_xss = 0;
11003
11004 #define __kvm_cpu_cap_has(UNUSED_, f) kvm_cpu_cap_has(f)
11005         cr4_reserved_bits = __cr4_reserved_bits(__kvm_cpu_cap_has, UNUSED_);
11006 #undef __kvm_cpu_cap_has
11007
11008         if (kvm_has_tsc_control) {
11009                 /*
11010                  * Make sure the user can only configure tsc_khz values that
11011                  * fit into a signed integer.
11012                  * A min value is not calculated because it will always
11013                  * be 1 on all machines.
11014                  */
11015                 u64 max = min(0x7fffffffULL,
11016                               __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz));
11017                 kvm_max_guest_tsc_khz = max;
11018
11019                 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;
11020         }
11021
11022         kvm_init_msr_list();
11023         return 0;
11024 }
11025
11026 void kvm_arch_hardware_unsetup(void)
11027 {
11028         static_call(kvm_x86_hardware_unsetup)();
11029 }
11030
11031 int kvm_arch_check_processor_compat(void *opaque)
11032 {
11033         struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
11034         struct kvm_x86_init_ops *ops = opaque;
11035
11036         WARN_ON(!irqs_disabled());
11037
11038         if (__cr4_reserved_bits(cpu_has, c) !=
11039             __cr4_reserved_bits(cpu_has, &boot_cpu_data))
11040                 return -EIO;
11041
11042         return ops->check_processor_compatibility();
11043 }
11044
11045 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
11046 {
11047         return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id;
11048 }
11049 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp);
11050
11051 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
11052 {
11053         return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
11054 }
11055
11056 __read_mostly DEFINE_STATIC_KEY_FALSE(kvm_has_noapic_vcpu);
11057 EXPORT_SYMBOL_GPL(kvm_has_noapic_vcpu);
11058
11059 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
11060 {
11061         struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
11062
11063         vcpu->arch.l1tf_flush_l1d = true;
11064         if (pmu->version && unlikely(pmu->event_count)) {
11065                 pmu->need_cleanup = true;
11066                 kvm_make_request(KVM_REQ_PMU, vcpu);
11067         }
11068         static_call(kvm_x86_sched_in)(vcpu, cpu);
11069 }
11070
11071 void kvm_arch_free_vm(struct kvm *kvm)
11072 {
11073         kfree(to_kvm_hv(kvm)->hv_pa_pg);
11074         vfree(kvm);
11075 }
11076
11077
11078 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
11079 {
11080         if (type)
11081                 return -EINVAL;
11082
11083         INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list);
11084         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
11085         INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
11086         INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages);
11087         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
11088         atomic_set(&kvm->arch.noncoherent_dma_count, 0);
11089
11090         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
11091         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
11092         /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
11093         set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
11094                 &kvm->arch.irq_sources_bitmap);
11095
11096         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
11097         mutex_init(&kvm->arch.apic_map_lock);
11098         spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
11099
11100         kvm->arch.kvmclock_offset = -get_kvmclock_base_ns();
11101         pvclock_update_vm_gtod_copy(kvm);
11102
11103         kvm->arch.guest_can_read_msr_platform_info = true;
11104
11105 #if IS_ENABLED(CONFIG_HYPERV)
11106         spin_lock_init(&kvm->arch.hv_root_tdp_lock);
11107         kvm->arch.hv_root_tdp = INVALID_PAGE;
11108 #endif
11109
11110         INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn);
11111         INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn);
11112
11113         kvm_apicv_init(kvm);
11114         kvm_hv_init_vm(kvm);
11115         kvm_page_track_init(kvm);
11116         kvm_mmu_init_vm(kvm);
11117
11118         return static_call(kvm_x86_vm_init)(kvm);
11119 }
11120
11121 int kvm_arch_post_init_vm(struct kvm *kvm)
11122 {
11123         return kvm_mmu_post_init_vm(kvm);
11124 }
11125
11126 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
11127 {
11128         vcpu_load(vcpu);
11129         kvm_mmu_unload(vcpu);
11130         vcpu_put(vcpu);
11131 }
11132
11133 static void kvm_free_vcpus(struct kvm *kvm)
11134 {
11135         unsigned int i;
11136         struct kvm_vcpu *vcpu;
11137
11138         /*
11139          * Unpin any mmu pages first.
11140          */
11141         kvm_for_each_vcpu(i, vcpu, kvm) {
11142                 kvm_clear_async_pf_completion_queue(vcpu);
11143                 kvm_unload_vcpu_mmu(vcpu);
11144         }
11145         kvm_for_each_vcpu(i, vcpu, kvm)
11146                 kvm_vcpu_destroy(vcpu);
11147
11148         mutex_lock(&kvm->lock);
11149         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
11150                 kvm->vcpus[i] = NULL;
11151
11152         atomic_set(&kvm->online_vcpus, 0);
11153         mutex_unlock(&kvm->lock);
11154 }
11155
11156 void kvm_arch_sync_events(struct kvm *kvm)
11157 {
11158         cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
11159         cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
11160         kvm_free_pit(kvm);
11161 }
11162
11163 #define  ERR_PTR_USR(e)  ((void __user *)ERR_PTR(e))
11164
11165 /**
11166  * __x86_set_memory_region: Setup KVM internal memory slot
11167  *
11168  * @kvm: the kvm pointer to the VM.
11169  * @id: the slot ID to setup.
11170  * @gpa: the GPA to install the slot (unused when @size == 0).
11171  * @size: the size of the slot. Set to zero to uninstall a slot.
11172  *
11173  * This function helps to setup a KVM internal memory slot.  Specify
11174  * @size > 0 to install a new slot, while @size == 0 to uninstall a
11175  * slot.  The return code can be one of the following:
11176  *
11177  *   HVA:           on success (uninstall will return a bogus HVA)
11178  *   -errno:        on error
11179  *
11180  * The caller should always use IS_ERR() to check the return value
11181  * before use.  Note, the KVM internal memory slots are guaranteed to
11182  * remain valid and unchanged until the VM is destroyed, i.e., the
11183  * GPA->HVA translation will not change.  However, the HVA is a user
11184  * address, i.e. its accessibility is not guaranteed, and must be
11185  * accessed via __copy_{to,from}_user().
11186  */
11187 void __user * __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa,
11188                                       u32 size)
11189 {
11190         int i, r;
11191         unsigned long hva, old_npages;
11192         struct kvm_memslots *slots = kvm_memslots(kvm);
11193         struct kvm_memory_slot *slot;
11194
11195         /* Called with kvm->slots_lock held.  */
11196         if (WARN_ON(id >= KVM_MEM_SLOTS_NUM))
11197                 return ERR_PTR_USR(-EINVAL);
11198
11199         slot = id_to_memslot(slots, id);
11200         if (size) {
11201                 if (slot && slot->npages)
11202                         return ERR_PTR_USR(-EEXIST);
11203
11204                 /*
11205                  * MAP_SHARED to prevent internal slot pages from being moved
11206                  * by fork()/COW.
11207                  */
11208                 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE,
11209                               MAP_SHARED | MAP_ANONYMOUS, 0);
11210                 if (IS_ERR((void *)hva))
11211                         return (void __user *)hva;
11212         } else {
11213                 if (!slot || !slot->npages)
11214                         return NULL;
11215
11216                 old_npages = slot->npages;
11217                 hva = slot->userspace_addr;
11218         }
11219
11220         for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
11221                 struct kvm_userspace_memory_region m;
11222
11223                 m.slot = id | (i << 16);
11224                 m.flags = 0;
11225                 m.guest_phys_addr = gpa;
11226                 m.userspace_addr = hva;
11227                 m.memory_size = size;
11228                 r = __kvm_set_memory_region(kvm, &m);
11229                 if (r < 0)
11230                         return ERR_PTR_USR(r);
11231         }
11232
11233         if (!size)
11234                 vm_munmap(hva, old_npages * PAGE_SIZE);
11235
11236         return (void __user *)hva;
11237 }
11238 EXPORT_SYMBOL_GPL(__x86_set_memory_region);
11239
11240 void kvm_arch_pre_destroy_vm(struct kvm *kvm)
11241 {
11242         kvm_mmu_pre_destroy_vm(kvm);
11243 }
11244
11245 void kvm_arch_destroy_vm(struct kvm *kvm)
11246 {
11247         if (current->mm == kvm->mm) {
11248                 /*
11249                  * Free memory regions allocated on behalf of userspace,
11250                  * unless the the memory map has changed due to process exit
11251                  * or fd copying.
11252                  */
11253                 mutex_lock(&kvm->slots_lock);
11254                 __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
11255                                         0, 0);
11256                 __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT,
11257                                         0, 0);
11258                 __x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
11259                 mutex_unlock(&kvm->slots_lock);
11260         }
11261         static_call_cond(kvm_x86_vm_destroy)(kvm);
11262         kvm_free_msr_filter(srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1));
11263         kvm_pic_destroy(kvm);
11264         kvm_ioapic_destroy(kvm);
11265         kvm_free_vcpus(kvm);
11266         kvfree(rcu_dereference_check(kvm->arch.apic_map, 1));
11267         kfree(srcu_dereference_check(kvm->arch.pmu_event_filter, &kvm->srcu, 1));
11268         kvm_mmu_uninit_vm(kvm);
11269         kvm_page_track_cleanup(kvm);
11270         kvm_xen_destroy_vm(kvm);
11271         kvm_hv_destroy_vm(kvm);
11272 }
11273
11274 static void memslot_rmap_free(struct kvm_memory_slot *slot)
11275 {
11276         int i;
11277
11278         for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
11279                 kvfree(slot->arch.rmap[i]);
11280                 slot->arch.rmap[i] = NULL;
11281         }
11282 }
11283
11284 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
11285 {
11286         int i;
11287
11288         memslot_rmap_free(slot);
11289
11290         for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
11291                 kvfree(slot->arch.lpage_info[i - 1]);
11292                 slot->arch.lpage_info[i - 1] = NULL;
11293         }
11294
11295         kvm_page_track_free_memslot(slot);
11296 }
11297
11298 static int memslot_rmap_alloc(struct kvm_memory_slot *slot,
11299                               unsigned long npages)
11300 {
11301         const int sz = sizeof(*slot->arch.rmap[0]);
11302         int i;
11303
11304         for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
11305                 int level = i + 1;
11306                 int lpages = gfn_to_index(slot->base_gfn + npages - 1,
11307                                           slot->base_gfn, level) + 1;
11308
11309                 WARN_ON(slot->arch.rmap[i]);
11310
11311                 slot->arch.rmap[i] = kvcalloc(lpages, sz, GFP_KERNEL_ACCOUNT);
11312                 if (!slot->arch.rmap[i]) {
11313                         memslot_rmap_free(slot);
11314                         return -ENOMEM;
11315                 }
11316         }
11317
11318         return 0;
11319 }
11320
11321 int alloc_all_memslots_rmaps(struct kvm *kvm)
11322 {
11323         struct kvm_memslots *slots;
11324         struct kvm_memory_slot *slot;
11325         int r, i;
11326
11327         /*
11328          * Check if memslots alreday have rmaps early before acquiring
11329          * the slots_arch_lock below.
11330          */
11331         if (kvm_memslots_have_rmaps(kvm))
11332                 return 0;
11333
11334         mutex_lock(&kvm->slots_arch_lock);
11335
11336         /*
11337          * Read memslots_have_rmaps again, under the slots arch lock,
11338          * before allocating the rmaps
11339          */
11340         if (kvm_memslots_have_rmaps(kvm)) {
11341                 mutex_unlock(&kvm->slots_arch_lock);
11342                 return 0;
11343         }
11344
11345         for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
11346                 slots = __kvm_memslots(kvm, i);
11347                 kvm_for_each_memslot(slot, slots) {
11348                         r = memslot_rmap_alloc(slot, slot->npages);
11349                         if (r) {
11350                                 mutex_unlock(&kvm->slots_arch_lock);
11351                                 return r;
11352                         }
11353                 }
11354         }
11355
11356         /*
11357          * Ensure that memslots_have_rmaps becomes true strictly after
11358          * all the rmap pointers are set.
11359          */
11360         smp_store_release(&kvm->arch.memslots_have_rmaps, true);
11361         mutex_unlock(&kvm->slots_arch_lock);
11362         return 0;
11363 }
11364
11365 static int kvm_alloc_memslot_metadata(struct kvm *kvm,
11366                                       struct kvm_memory_slot *slot,
11367                                       unsigned long npages)
11368 {
11369         int i, r;
11370
11371         /*
11372          * Clear out the previous array pointers for the KVM_MR_MOVE case.  The
11373          * old arrays will be freed by __kvm_set_memory_region() if installing
11374          * the new memslot is successful.
11375          */
11376         memset(&slot->arch, 0, sizeof(slot->arch));
11377
11378         if (kvm_memslots_have_rmaps(kvm)) {
11379                 r = memslot_rmap_alloc(slot, npages);
11380                 if (r)
11381                         return r;
11382         }
11383
11384         for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
11385                 struct kvm_lpage_info *linfo;
11386                 unsigned long ugfn;
11387                 int lpages;
11388                 int level = i + 1;
11389
11390                 lpages = gfn_to_index(slot->base_gfn + npages - 1,
11391                                       slot->base_gfn, level) + 1;
11392
11393                 linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
11394                 if (!linfo)
11395                         goto out_free;
11396
11397                 slot->arch.lpage_info[i - 1] = linfo;
11398
11399                 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
11400                         linfo[0].disallow_lpage = 1;
11401                 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
11402                         linfo[lpages - 1].disallow_lpage = 1;
11403                 ugfn = slot->userspace_addr >> PAGE_SHIFT;
11404                 /*
11405                  * If the gfn and userspace address are not aligned wrt each
11406                  * other, disable large page support for this slot.
11407                  */
11408                 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1)) {
11409                         unsigned long j;
11410
11411                         for (j = 0; j < lpages; ++j)
11412                                 linfo[j].disallow_lpage = 1;
11413                 }
11414         }
11415
11416         if (kvm_page_track_create_memslot(slot, npages))
11417                 goto out_free;
11418
11419         return 0;
11420
11421 out_free:
11422         memslot_rmap_free(slot);
11423
11424         for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
11425                 kvfree(slot->arch.lpage_info[i - 1]);
11426                 slot->arch.lpage_info[i - 1] = NULL;
11427         }
11428         return -ENOMEM;
11429 }
11430
11431 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
11432 {
11433         struct kvm_vcpu *vcpu;
11434         int i;
11435
11436         /*
11437          * memslots->generation has been incremented.
11438          * mmio generation may have reached its maximum value.
11439          */
11440         kvm_mmu_invalidate_mmio_sptes(kvm, gen);
11441
11442         /* Force re-initialization of steal_time cache */
11443         kvm_for_each_vcpu(i, vcpu, kvm)
11444                 kvm_vcpu_kick(vcpu);
11445 }
11446
11447 int kvm_arch_prepare_memory_region(struct kvm *kvm,
11448                                 struct kvm_memory_slot *memslot,
11449                                 const struct kvm_userspace_memory_region *mem,
11450                                 enum kvm_mr_change change)
11451 {
11452         if (change == KVM_MR_CREATE || change == KVM_MR_MOVE)
11453                 return kvm_alloc_memslot_metadata(kvm, memslot,
11454                                                   mem->memory_size >> PAGE_SHIFT);
11455         return 0;
11456 }
11457
11458
11459 static void kvm_mmu_update_cpu_dirty_logging(struct kvm *kvm, bool enable)
11460 {
11461         struct kvm_arch *ka = &kvm->arch;
11462
11463         if (!kvm_x86_ops.cpu_dirty_log_size)
11464                 return;
11465
11466         if ((enable && ++ka->cpu_dirty_logging_count == 1) ||
11467             (!enable && --ka->cpu_dirty_logging_count == 0))
11468                 kvm_make_all_cpus_request(kvm, KVM_REQ_UPDATE_CPU_DIRTY_LOGGING);
11469
11470         WARN_ON_ONCE(ka->cpu_dirty_logging_count < 0);
11471 }
11472
11473 static void kvm_mmu_slot_apply_flags(struct kvm *kvm,
11474                                      struct kvm_memory_slot *old,
11475                                      struct kvm_memory_slot *new,
11476                                      enum kvm_mr_change change)
11477 {
11478         bool log_dirty_pages = new->flags & KVM_MEM_LOG_DIRTY_PAGES;
11479
11480         /*
11481          * Update CPU dirty logging if dirty logging is being toggled.  This
11482          * applies to all operations.
11483          */
11484         if ((old->flags ^ new->flags) & KVM_MEM_LOG_DIRTY_PAGES)
11485                 kvm_mmu_update_cpu_dirty_logging(kvm, log_dirty_pages);
11486
11487         /*
11488          * Nothing more to do for RO slots (which can't be dirtied and can't be
11489          * made writable) or CREATE/MOVE/DELETE of a slot.
11490          *
11491          * For a memslot with dirty logging disabled:
11492          * CREATE:      No dirty mappings will already exist.
11493          * MOVE/DELETE: The old mappings will already have been cleaned up by
11494          *              kvm_arch_flush_shadow_memslot()
11495          *
11496          * For a memslot with dirty logging enabled:
11497          * CREATE:      No shadow pages exist, thus nothing to write-protect
11498          *              and no dirty bits to clear.
11499          * MOVE/DELETE: The old mappings will already have been cleaned up by
11500          *              kvm_arch_flush_shadow_memslot().
11501          */
11502         if ((change != KVM_MR_FLAGS_ONLY) || (new->flags & KVM_MEM_READONLY))
11503                 return;
11504
11505         /*
11506          * READONLY and non-flags changes were filtered out above, and the only
11507          * other flag is LOG_DIRTY_PAGES, i.e. something is wrong if dirty
11508          * logging isn't being toggled on or off.
11509          */
11510         if (WARN_ON_ONCE(!((old->flags ^ new->flags) & KVM_MEM_LOG_DIRTY_PAGES)))
11511                 return;
11512
11513         if (!log_dirty_pages) {
11514                 /*
11515                  * Dirty logging tracks sptes in 4k granularity, meaning that
11516                  * large sptes have to be split.  If live migration succeeds,
11517                  * the guest in the source machine will be destroyed and large
11518                  * sptes will be created in the destination.  However, if the
11519                  * guest continues to run in the source machine (for example if
11520                  * live migration fails), small sptes will remain around and
11521                  * cause bad performance.
11522                  *
11523                  * Scan sptes if dirty logging has been stopped, dropping those
11524                  * which can be collapsed into a single large-page spte.  Later
11525                  * page faults will create the large-page sptes.
11526                  */
11527                 kvm_mmu_zap_collapsible_sptes(kvm, new);
11528         } else {
11529                 /*
11530                  * Initially-all-set does not require write protecting any page,
11531                  * because they're all assumed to be dirty.
11532                  */
11533                 if (kvm_dirty_log_manual_protect_and_init_set(kvm))
11534                         return;
11535
11536                 if (kvm_x86_ops.cpu_dirty_log_size) {
11537                         kvm_mmu_slot_leaf_clear_dirty(kvm, new);
11538                         kvm_mmu_slot_remove_write_access(kvm, new, PG_LEVEL_2M);
11539                 } else {
11540                         kvm_mmu_slot_remove_write_access(kvm, new, PG_LEVEL_4K);
11541                 }
11542         }
11543 }
11544
11545 void kvm_arch_commit_memory_region(struct kvm *kvm,
11546                                 const struct kvm_userspace_memory_region *mem,
11547                                 struct kvm_memory_slot *old,
11548                                 const struct kvm_memory_slot *new,
11549                                 enum kvm_mr_change change)
11550 {
11551         if (!kvm->arch.n_requested_mmu_pages)
11552                 kvm_mmu_change_mmu_pages(kvm,
11553                                 kvm_mmu_calculate_default_mmu_pages(kvm));
11554
11555         /*
11556          * FIXME: const-ify all uses of struct kvm_memory_slot.
11557          */
11558         kvm_mmu_slot_apply_flags(kvm, old, (struct kvm_memory_slot *) new, change);
11559
11560         /* Free the arrays associated with the old memslot. */
11561         if (change == KVM_MR_MOVE)
11562                 kvm_arch_free_memslot(kvm, old);
11563 }
11564
11565 void kvm_arch_flush_shadow_all(struct kvm *kvm)
11566 {
11567         kvm_mmu_zap_all(kvm);
11568 }
11569
11570 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
11571                                    struct kvm_memory_slot *slot)
11572 {
11573         kvm_page_track_flush_slot(kvm, slot);
11574 }
11575
11576 static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu)
11577 {
11578         return (is_guest_mode(vcpu) &&
11579                         kvm_x86_ops.guest_apic_has_interrupt &&
11580                         static_call(kvm_x86_guest_apic_has_interrupt)(vcpu));
11581 }
11582
11583 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
11584 {
11585         if (!list_empty_careful(&vcpu->async_pf.done))
11586                 return true;
11587
11588         if (kvm_apic_has_events(vcpu))
11589                 return true;
11590
11591         if (vcpu->arch.pv.pv_unhalted)
11592                 return true;
11593
11594         if (vcpu->arch.exception.pending)
11595                 return true;
11596
11597         if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
11598             (vcpu->arch.nmi_pending &&
11599              static_call(kvm_x86_nmi_allowed)(vcpu, false)))
11600                 return true;
11601
11602         if (kvm_test_request(KVM_REQ_SMI, vcpu) ||
11603             (vcpu->arch.smi_pending &&
11604              static_call(kvm_x86_smi_allowed)(vcpu, false)))
11605                 return true;
11606
11607         if (kvm_arch_interrupt_allowed(vcpu) &&
11608             (kvm_cpu_has_interrupt(vcpu) ||
11609             kvm_guest_apic_has_interrupt(vcpu)))
11610                 return true;
11611
11612         if (kvm_hv_has_stimer_pending(vcpu))
11613                 return true;
11614
11615         if (is_guest_mode(vcpu) &&
11616             kvm_x86_ops.nested_ops->hv_timer_pending &&
11617             kvm_x86_ops.nested_ops->hv_timer_pending(vcpu))
11618                 return true;
11619
11620         return false;
11621 }
11622
11623 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
11624 {
11625         return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
11626 }
11627
11628 bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu)
11629 {
11630         if (vcpu->arch.apicv_active && static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu))
11631                 return true;
11632
11633         return false;
11634 }
11635
11636 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
11637 {
11638         if (READ_ONCE(vcpu->arch.pv.pv_unhalted))
11639                 return true;
11640
11641         if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
11642                 kvm_test_request(KVM_REQ_SMI, vcpu) ||
11643                  kvm_test_request(KVM_REQ_EVENT, vcpu))
11644                 return true;
11645
11646         return kvm_arch_dy_has_pending_interrupt(vcpu);
11647 }
11648
11649 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
11650 {
11651         if (vcpu->arch.guest_state_protected)
11652                 return true;
11653
11654         return vcpu->arch.preempted_in_kernel;
11655 }
11656
11657 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
11658 {
11659         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
11660 }
11661
11662 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
11663 {
11664         return static_call(kvm_x86_interrupt_allowed)(vcpu, false);
11665 }
11666
11667 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu)
11668 {
11669         /* Can't read the RIP when guest state is protected, just return 0 */
11670         if (vcpu->arch.guest_state_protected)
11671                 return 0;
11672
11673         if (is_64_bit_mode(vcpu))
11674                 return kvm_rip_read(vcpu);
11675         return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) +
11676                      kvm_rip_read(vcpu));
11677 }
11678 EXPORT_SYMBOL_GPL(kvm_get_linear_rip);
11679
11680 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
11681 {
11682         return kvm_get_linear_rip(vcpu) == linear_rip;
11683 }
11684 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
11685
11686 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
11687 {
11688         unsigned long rflags;
11689
11690         rflags = static_call(kvm_x86_get_rflags)(vcpu);
11691         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
11692                 rflags &= ~X86_EFLAGS_TF;
11693         return rflags;
11694 }
11695 EXPORT_SYMBOL_GPL(kvm_get_rflags);
11696
11697 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
11698 {
11699         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
11700             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
11701                 rflags |= X86_EFLAGS_TF;
11702         static_call(kvm_x86_set_rflags)(vcpu, rflags);
11703 }
11704
11705 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
11706 {
11707         __kvm_set_rflags(vcpu, rflags);
11708         kvm_make_request(KVM_REQ_EVENT, vcpu);
11709 }
11710 EXPORT_SYMBOL_GPL(kvm_set_rflags);
11711
11712 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
11713 {
11714         int r;
11715
11716         if ((vcpu->arch.mmu->direct_map != work->arch.direct_map) ||
11717               work->wakeup_all)
11718                 return;
11719
11720         r = kvm_mmu_reload(vcpu);
11721         if (unlikely(r))
11722                 return;
11723
11724         if (!vcpu->arch.mmu->direct_map &&
11725               work->arch.cr3 != vcpu->arch.mmu->get_guest_pgd(vcpu))
11726                 return;
11727
11728         kvm_mmu_do_page_fault(vcpu, work->cr2_or_gpa, 0, true);
11729 }
11730
11731 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
11732 {
11733         BUILD_BUG_ON(!is_power_of_2(ASYNC_PF_PER_VCPU));
11734
11735         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
11736 }
11737
11738 static inline u32 kvm_async_pf_next_probe(u32 key)
11739 {
11740         return (key + 1) & (ASYNC_PF_PER_VCPU - 1);
11741 }
11742
11743 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
11744 {
11745         u32 key = kvm_async_pf_hash_fn(gfn);
11746
11747         while (vcpu->arch.apf.gfns[key] != ~0)
11748                 key = kvm_async_pf_next_probe(key);
11749
11750         vcpu->arch.apf.gfns[key] = gfn;
11751 }
11752
11753 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
11754 {
11755         int i;
11756         u32 key = kvm_async_pf_hash_fn(gfn);
11757
11758         for (i = 0; i < ASYNC_PF_PER_VCPU &&
11759                      (vcpu->arch.apf.gfns[key] != gfn &&
11760                       vcpu->arch.apf.gfns[key] != ~0); i++)
11761                 key = kvm_async_pf_next_probe(key);
11762
11763         return key;
11764 }
11765
11766 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
11767 {
11768         return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
11769 }
11770
11771 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
11772 {
11773         u32 i, j, k;
11774
11775         i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
11776
11777         if (WARN_ON_ONCE(vcpu->arch.apf.gfns[i] != gfn))
11778                 return;
11779
11780         while (true) {
11781                 vcpu->arch.apf.gfns[i] = ~0;
11782                 do {
11783                         j = kvm_async_pf_next_probe(j);
11784                         if (vcpu->arch.apf.gfns[j] == ~0)
11785                                 return;
11786                         k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
11787                         /*
11788                          * k lies cyclically in ]i,j]
11789                          * |    i.k.j |
11790                          * |....j i.k.| or  |.k..j i...|
11791                          */
11792                 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
11793                 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
11794                 i = j;
11795         }
11796 }
11797
11798 static inline int apf_put_user_notpresent(struct kvm_vcpu *vcpu)
11799 {
11800         u32 reason = KVM_PV_REASON_PAGE_NOT_PRESENT;
11801
11802         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &reason,
11803                                       sizeof(reason));
11804 }
11805
11806 static inline int apf_put_user_ready(struct kvm_vcpu *vcpu, u32 token)
11807 {
11808         unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token);
11809
11810         return kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data,
11811                                              &token, offset, sizeof(token));
11812 }
11813
11814 static inline bool apf_pageready_slot_free(struct kvm_vcpu *vcpu)
11815 {
11816         unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token);
11817         u32 val;
11818
11819         if (kvm_read_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data,
11820                                          &val, offset, sizeof(val)))
11821                 return false;
11822
11823         return !val;
11824 }
11825
11826 static bool kvm_can_deliver_async_pf(struct kvm_vcpu *vcpu)
11827 {
11828         if (!vcpu->arch.apf.delivery_as_pf_vmexit && is_guest_mode(vcpu))
11829                 return false;
11830
11831         if (!kvm_pv_async_pf_enabled(vcpu) ||
11832             (vcpu->arch.apf.send_user_only && static_call(kvm_x86_get_cpl)(vcpu) == 0))
11833                 return false;
11834
11835         return true;
11836 }
11837
11838 bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu)
11839 {
11840         if (unlikely(!lapic_in_kernel(vcpu) ||
11841                      kvm_event_needs_reinjection(vcpu) ||
11842                      vcpu->arch.exception.pending))
11843                 return false;
11844
11845         if (kvm_hlt_in_guest(vcpu->kvm) && !kvm_can_deliver_async_pf(vcpu))
11846                 return false;
11847
11848         /*
11849          * If interrupts are off we cannot even use an artificial
11850          * halt state.
11851          */
11852         return kvm_arch_interrupt_allowed(vcpu);
11853 }
11854
11855 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
11856                                      struct kvm_async_pf *work)
11857 {
11858         struct x86_exception fault;
11859
11860         trace_kvm_async_pf_not_present(work->arch.token, work->cr2_or_gpa);
11861         kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
11862
11863         if (kvm_can_deliver_async_pf(vcpu) &&
11864             !apf_put_user_notpresent(vcpu)) {
11865                 fault.vector = PF_VECTOR;
11866                 fault.error_code_valid = true;
11867                 fault.error_code = 0;
11868                 fault.nested_page_fault = false;
11869                 fault.address = work->arch.token;
11870                 fault.async_page_fault = true;
11871                 kvm_inject_page_fault(vcpu, &fault);
11872                 return true;
11873         } else {
11874                 /*
11875                  * It is not possible to deliver a paravirtualized asynchronous
11876                  * page fault, but putting the guest in an artificial halt state
11877                  * can be beneficial nevertheless: if an interrupt arrives, we
11878                  * can deliver it timely and perhaps the guest will schedule
11879                  * another process.  When the instruction that triggered a page
11880                  * fault is retried, hopefully the page will be ready in the host.
11881                  */
11882                 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
11883                 return false;
11884         }
11885 }
11886
11887 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
11888                                  struct kvm_async_pf *work)
11889 {
11890         struct kvm_lapic_irq irq = {
11891                 .delivery_mode = APIC_DM_FIXED,
11892                 .vector = vcpu->arch.apf.vec
11893         };
11894
11895         if (work->wakeup_all)
11896                 work->arch.token = ~0; /* broadcast wakeup */
11897         else
11898                 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
11899         trace_kvm_async_pf_ready(work->arch.token, work->cr2_or_gpa);
11900
11901         if ((work->wakeup_all || work->notpresent_injected) &&
11902             kvm_pv_async_pf_enabled(vcpu) &&
11903             !apf_put_user_ready(vcpu, work->arch.token)) {
11904                 vcpu->arch.apf.pageready_pending = true;
11905                 kvm_apic_set_irq(vcpu, &irq, NULL);
11906         }
11907
11908         vcpu->arch.apf.halted = false;
11909         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
11910 }
11911
11912 void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu)
11913 {
11914         kvm_make_request(KVM_REQ_APF_READY, vcpu);
11915         if (!vcpu->arch.apf.pageready_pending)
11916                 kvm_vcpu_kick(vcpu);
11917 }
11918
11919 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
11920 {
11921         if (!kvm_pv_async_pf_enabled(vcpu))
11922                 return true;
11923         else
11924                 return kvm_lapic_enabled(vcpu) && apf_pageready_slot_free(vcpu);
11925 }
11926
11927 void kvm_arch_start_assignment(struct kvm *kvm)
11928 {
11929         if (atomic_inc_return(&kvm->arch.assigned_device_count) == 1)
11930                 static_call_cond(kvm_x86_start_assignment)(kvm);
11931 }
11932 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment);
11933
11934 void kvm_arch_end_assignment(struct kvm *kvm)
11935 {
11936         atomic_dec(&kvm->arch.assigned_device_count);
11937 }
11938 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment);
11939
11940 bool kvm_arch_has_assigned_device(struct kvm *kvm)
11941 {
11942         return atomic_read(&kvm->arch.assigned_device_count);
11943 }
11944 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device);
11945
11946 void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
11947 {
11948         atomic_inc(&kvm->arch.noncoherent_dma_count);
11949 }
11950 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma);
11951
11952 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
11953 {
11954         atomic_dec(&kvm->arch.noncoherent_dma_count);
11955 }
11956 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma);
11957
11958 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
11959 {
11960         return atomic_read(&kvm->arch.noncoherent_dma_count);
11961 }
11962 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
11963
11964 bool kvm_arch_has_irq_bypass(void)
11965 {
11966         return true;
11967 }
11968
11969 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
11970                                       struct irq_bypass_producer *prod)
11971 {
11972         struct kvm_kernel_irqfd *irqfd =
11973                 container_of(cons, struct kvm_kernel_irqfd, consumer);
11974         int ret;
11975
11976         irqfd->producer = prod;
11977         kvm_arch_start_assignment(irqfd->kvm);
11978         ret = static_call(kvm_x86_update_pi_irte)(irqfd->kvm,
11979                                          prod->irq, irqfd->gsi, 1);
11980
11981         if (ret)
11982                 kvm_arch_end_assignment(irqfd->kvm);
11983
11984         return ret;
11985 }
11986
11987 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
11988                                       struct irq_bypass_producer *prod)
11989 {
11990         int ret;
11991         struct kvm_kernel_irqfd *irqfd =
11992                 container_of(cons, struct kvm_kernel_irqfd, consumer);
11993
11994         WARN_ON(irqfd->producer != prod);
11995         irqfd->producer = NULL;
11996
11997         /*
11998          * When producer of consumer is unregistered, we change back to
11999          * remapped mode, so we can re-use the current implementation
12000          * when the irq is masked/disabled or the consumer side (KVM
12001          * int this case doesn't want to receive the interrupts.
12002         */
12003         ret = static_call(kvm_x86_update_pi_irte)(irqfd->kvm, prod->irq, irqfd->gsi, 0);
12004         if (ret)
12005                 printk(KERN_INFO "irq bypass consumer (token %p) unregistration"
12006                        " fails: %d\n", irqfd->consumer.token, ret);
12007
12008         kvm_arch_end_assignment(irqfd->kvm);
12009 }
12010
12011 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
12012                                    uint32_t guest_irq, bool set)
12013 {
12014         return static_call(kvm_x86_update_pi_irte)(kvm, host_irq, guest_irq, set);
12015 }
12016
12017 bool kvm_vector_hashing_enabled(void)
12018 {
12019         return vector_hashing;
12020 }
12021
12022 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
12023 {
12024         return (vcpu->arch.msr_kvm_poll_control & 1) == 0;
12025 }
12026 EXPORT_SYMBOL_GPL(kvm_arch_no_poll);
12027
12028
12029 int kvm_spec_ctrl_test_value(u64 value)
12030 {
12031         /*
12032          * test that setting IA32_SPEC_CTRL to given value
12033          * is allowed by the host processor
12034          */
12035
12036         u64 saved_value;
12037         unsigned long flags;
12038         int ret = 0;
12039
12040         local_irq_save(flags);
12041
12042         if (rdmsrl_safe(MSR_IA32_SPEC_CTRL, &saved_value))
12043                 ret = 1;
12044         else if (wrmsrl_safe(MSR_IA32_SPEC_CTRL, value))
12045                 ret = 1;
12046         else
12047                 wrmsrl(MSR_IA32_SPEC_CTRL, saved_value);
12048
12049         local_irq_restore(flags);
12050
12051         return ret;
12052 }
12053 EXPORT_SYMBOL_GPL(kvm_spec_ctrl_test_value);
12054
12055 void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_code)
12056 {
12057         struct x86_exception fault;
12058         u32 access = error_code &
12059                 (PFERR_WRITE_MASK | PFERR_FETCH_MASK | PFERR_USER_MASK);
12060
12061         if (!(error_code & PFERR_PRESENT_MASK) ||
12062             vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, &fault) != UNMAPPED_GVA) {
12063                 /*
12064                  * If vcpu->arch.walk_mmu->gva_to_gpa succeeded, the page
12065                  * tables probably do not match the TLB.  Just proceed
12066                  * with the error code that the processor gave.
12067                  */
12068                 fault.vector = PF_VECTOR;
12069                 fault.error_code_valid = true;
12070                 fault.error_code = error_code;
12071                 fault.nested_page_fault = false;
12072                 fault.address = gva;
12073         }
12074         vcpu->arch.walk_mmu->inject_page_fault(vcpu, &fault);
12075 }
12076 EXPORT_SYMBOL_GPL(kvm_fixup_and_inject_pf_error);
12077
12078 /*
12079  * Handles kvm_read/write_guest_virt*() result and either injects #PF or returns
12080  * KVM_EXIT_INTERNAL_ERROR for cases not currently handled by KVM. Return value
12081  * indicates whether exit to userspace is needed.
12082  */
12083 int kvm_handle_memory_failure(struct kvm_vcpu *vcpu, int r,
12084                               struct x86_exception *e)
12085 {
12086         if (r == X86EMUL_PROPAGATE_FAULT) {
12087                 kvm_inject_emulated_page_fault(vcpu, e);
12088                 return 1;
12089         }
12090
12091         /*
12092          * In case kvm_read/write_guest_virt*() failed with X86EMUL_IO_NEEDED
12093          * while handling a VMX instruction KVM could've handled the request
12094          * correctly by exiting to userspace and performing I/O but there
12095          * doesn't seem to be a real use-case behind such requests, just return
12096          * KVM_EXIT_INTERNAL_ERROR for now.
12097          */
12098         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
12099         vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
12100         vcpu->run->internal.ndata = 0;
12101
12102         return 0;
12103 }
12104 EXPORT_SYMBOL_GPL(kvm_handle_memory_failure);
12105
12106 int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
12107 {
12108         bool pcid_enabled;
12109         struct x86_exception e;
12110         struct {
12111                 u64 pcid;
12112                 u64 gla;
12113         } operand;
12114         int r;
12115
12116         r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
12117         if (r != X86EMUL_CONTINUE)
12118                 return kvm_handle_memory_failure(vcpu, r, &e);
12119
12120         if (operand.pcid >> 12 != 0) {
12121                 kvm_inject_gp(vcpu, 0);
12122                 return 1;
12123         }
12124
12125         pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE);
12126
12127         switch (type) {
12128         case INVPCID_TYPE_INDIV_ADDR:
12129                 if ((!pcid_enabled && (operand.pcid != 0)) ||
12130                     is_noncanonical_address(operand.gla, vcpu)) {
12131                         kvm_inject_gp(vcpu, 0);
12132                         return 1;
12133                 }
12134                 kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid);
12135                 return kvm_skip_emulated_instruction(vcpu);
12136
12137         case INVPCID_TYPE_SINGLE_CTXT:
12138                 if (!pcid_enabled && (operand.pcid != 0)) {
12139                         kvm_inject_gp(vcpu, 0);
12140                         return 1;
12141                 }
12142
12143                 kvm_invalidate_pcid(vcpu, operand.pcid);
12144                 return kvm_skip_emulated_instruction(vcpu);
12145
12146         case INVPCID_TYPE_ALL_NON_GLOBAL:
12147                 /*
12148                  * Currently, KVM doesn't mark global entries in the shadow
12149                  * page tables, so a non-global flush just degenerates to a
12150                  * global flush. If needed, we could optimize this later by
12151                  * keeping track of global entries in shadow page tables.
12152                  */
12153
12154                 fallthrough;
12155         case INVPCID_TYPE_ALL_INCL_GLOBAL:
12156                 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
12157                 return kvm_skip_emulated_instruction(vcpu);
12158
12159         default:
12160                 BUG(); /* We have already checked above that type <= 3 */
12161         }
12162 }
12163 EXPORT_SYMBOL_GPL(kvm_handle_invpcid);
12164
12165 static int complete_sev_es_emulated_mmio(struct kvm_vcpu *vcpu)
12166 {
12167         struct kvm_run *run = vcpu->run;
12168         struct kvm_mmio_fragment *frag;
12169         unsigned int len;
12170
12171         BUG_ON(!vcpu->mmio_needed);
12172
12173         /* Complete previous fragment */
12174         frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
12175         len = min(8u, frag->len);
12176         if (!vcpu->mmio_is_write)
12177                 memcpy(frag->data, run->mmio.data, len);
12178
12179         if (frag->len <= 8) {
12180                 /* Switch to the next fragment. */
12181                 frag++;
12182                 vcpu->mmio_cur_fragment++;
12183         } else {
12184                 /* Go forward to the next mmio piece. */
12185                 frag->data += len;
12186                 frag->gpa += len;
12187                 frag->len -= len;
12188         }
12189
12190         if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
12191                 vcpu->mmio_needed = 0;
12192
12193                 // VMG change, at this point, we're always done
12194                 // RIP has already been advanced
12195                 return 1;
12196         }
12197
12198         // More MMIO is needed
12199         run->mmio.phys_addr = frag->gpa;
12200         run->mmio.len = min(8u, frag->len);
12201         run->mmio.is_write = vcpu->mmio_is_write;
12202         if (run->mmio.is_write)
12203                 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
12204         run->exit_reason = KVM_EXIT_MMIO;
12205
12206         vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
12207
12208         return 0;
12209 }
12210
12211 int kvm_sev_es_mmio_write(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes,
12212                           void *data)
12213 {
12214         int handled;
12215         struct kvm_mmio_fragment *frag;
12216
12217         if (!data)
12218                 return -EINVAL;
12219
12220         handled = write_emultor.read_write_mmio(vcpu, gpa, bytes, data);
12221         if (handled == bytes)
12222                 return 1;
12223
12224         bytes -= handled;
12225         gpa += handled;
12226         data += handled;
12227
12228         /*TODO: Check if need to increment number of frags */
12229         frag = vcpu->mmio_fragments;
12230         vcpu->mmio_nr_fragments = 1;
12231         frag->len = bytes;
12232         frag->gpa = gpa;
12233         frag->data = data;
12234
12235         vcpu->mmio_needed = 1;
12236         vcpu->mmio_cur_fragment = 0;
12237
12238         vcpu->run->mmio.phys_addr = gpa;
12239         vcpu->run->mmio.len = min(8u, frag->len);
12240         vcpu->run->mmio.is_write = 1;
12241         memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
12242         vcpu->run->exit_reason = KVM_EXIT_MMIO;
12243
12244         vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
12245
12246         return 0;
12247 }
12248 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_write);
12249
12250 int kvm_sev_es_mmio_read(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes,
12251                          void *data)
12252 {
12253         int handled;
12254         struct kvm_mmio_fragment *frag;
12255
12256         if (!data)
12257                 return -EINVAL;
12258
12259         handled = read_emultor.read_write_mmio(vcpu, gpa, bytes, data);
12260         if (handled == bytes)
12261                 return 1;
12262
12263         bytes -= handled;
12264         gpa += handled;
12265         data += handled;
12266
12267         /*TODO: Check if need to increment number of frags */
12268         frag = vcpu->mmio_fragments;
12269         vcpu->mmio_nr_fragments = 1;
12270         frag->len = bytes;
12271         frag->gpa = gpa;
12272         frag->data = data;
12273
12274         vcpu->mmio_needed = 1;
12275         vcpu->mmio_cur_fragment = 0;
12276
12277         vcpu->run->mmio.phys_addr = gpa;
12278         vcpu->run->mmio.len = min(8u, frag->len);
12279         vcpu->run->mmio.is_write = 0;
12280         vcpu->run->exit_reason = KVM_EXIT_MMIO;
12281
12282         vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
12283
12284         return 0;
12285 }
12286 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_read);
12287
12288 static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu)
12289 {
12290         memcpy(vcpu->arch.guest_ins_data, vcpu->arch.pio_data,
12291                vcpu->arch.pio.count * vcpu->arch.pio.size);
12292         vcpu->arch.pio.count = 0;
12293
12294         return 1;
12295 }
12296
12297 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
12298                            unsigned int port, void *data,  unsigned int count)
12299 {
12300         int ret;
12301
12302         ret = emulator_pio_out_emulated(vcpu->arch.emulate_ctxt, size, port,
12303                                         data, count);
12304         if (ret)
12305                 return ret;
12306
12307         vcpu->arch.pio.count = 0;
12308
12309         return 0;
12310 }
12311
12312 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
12313                           unsigned int port, void *data, unsigned int count)
12314 {
12315         int ret;
12316
12317         ret = emulator_pio_in_emulated(vcpu->arch.emulate_ctxt, size, port,
12318                                        data, count);
12319         if (ret) {
12320                 vcpu->arch.pio.count = 0;
12321         } else {
12322                 vcpu->arch.guest_ins_data = data;
12323                 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_ins;
12324         }
12325
12326         return 0;
12327 }
12328
12329 int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size,
12330                          unsigned int port, void *data,  unsigned int count,
12331                          int in)
12332 {
12333         return in ? kvm_sev_es_ins(vcpu, size, port, data, count)
12334                   : kvm_sev_es_outs(vcpu, size, port, data, count);
12335 }
12336 EXPORT_SYMBOL_GPL(kvm_sev_es_string_io);
12337
12338 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_entry);
12339 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
12340 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
12341 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
12342 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
12343 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
12344 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
12345 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
12346 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
12347 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
12348 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
12349 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed);
12350 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
12351 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
12352 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
12353 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
12354 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window_update);
12355 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
12356 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
12357 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
12358 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
12359 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
12360 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request);
12361 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
12362 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
12363 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter);
12364 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit);