1 // SPDX-License-Identifier: GPL-2.0-only
3 * Kernel-based Virtual Machine driver for Linux
5 * derived from drivers/kvm/kvm_main.c
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.
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>
19 #include <linux/kvm_host.h>
25 #include "kvm_cache_regs.h"
26 #include "kvm_emulate.h"
35 #include <linux/clocksource.h>
36 #include <linux/interrupt.h>
37 #include <linux/kvm.h>
39 #include <linux/vmalloc.h>
40 #include <linux/export.h>
41 #include <linux/moduleparam.h>
42 #include <linux/mman.h>
43 #include <linux/highmem.h>
44 #include <linux/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>
63 #include <trace/events/kvm.h>
65 #include <asm/debugreg.h>
70 #include <linux/kernel_stat.h>
71 #include <asm/fpu/api.h>
72 #include <asm/fpu/xcr.h>
73 #include <asm/fpu/xstate.h>
74 #include <asm/pvclock.h>
75 #include <asm/div64.h>
76 #include <asm/irq_remapping.h>
77 #include <asm/mshyperv.h>
78 #include <asm/hypervisor.h>
79 #include <asm/tlbflush.h>
80 #include <asm/intel_pt.h>
81 #include <asm/emulate_prefix.h>
83 #include <clocksource/hyperv_timer.h>
85 #define CREATE_TRACE_POINTS
88 #define MAX_IO_MSRS 256
89 #define KVM_MAX_MCE_BANKS 32
91 struct kvm_caps kvm_caps __read_mostly = {
92 .supported_mce_cap = MCG_CTL_P | MCG_SER_P,
94 EXPORT_SYMBOL_GPL(kvm_caps);
96 #define ERR_PTR_USR(e) ((void __user *)ERR_PTR(e))
98 #define emul_to_vcpu(ctxt) \
99 ((struct kvm_vcpu *)(ctxt)->vcpu)
102 * - enable syscall per default because its emulated by KVM
103 * - enable LME and LMA per default on 64 bit KVM
107 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
109 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
112 static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS;
114 #define KVM_EXIT_HYPERCALL_VALID_MASK (1 << KVM_HC_MAP_GPA_RANGE)
116 #define KVM_CAP_PMU_VALID_MASK KVM_PMU_CAP_DISABLE
118 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \
119 KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
121 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
122 static void process_nmi(struct kvm_vcpu *vcpu);
123 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
124 static void store_regs(struct kvm_vcpu *vcpu);
125 static int sync_regs(struct kvm_vcpu *vcpu);
126 static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu);
128 static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2);
129 static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2);
131 struct kvm_x86_ops kvm_x86_ops __read_mostly;
133 #define KVM_X86_OP(func) \
134 DEFINE_STATIC_CALL_NULL(kvm_x86_##func, \
135 *(((struct kvm_x86_ops *)0)->func));
136 #define KVM_X86_OP_OPTIONAL KVM_X86_OP
137 #define KVM_X86_OP_OPTIONAL_RET0 KVM_X86_OP
138 #include <asm/kvm-x86-ops.h>
139 EXPORT_STATIC_CALL_GPL(kvm_x86_get_cs_db_l_bits);
140 EXPORT_STATIC_CALL_GPL(kvm_x86_cache_reg);
142 static bool __read_mostly ignore_msrs = 0;
143 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
145 bool __read_mostly report_ignored_msrs = true;
146 module_param(report_ignored_msrs, bool, S_IRUGO | S_IWUSR);
147 EXPORT_SYMBOL_GPL(report_ignored_msrs);
149 unsigned int min_timer_period_us = 200;
150 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
152 static bool __read_mostly kvmclock_periodic_sync = true;
153 module_param(kvmclock_periodic_sync, bool, S_IRUGO);
155 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
156 static u32 __read_mostly tsc_tolerance_ppm = 250;
157 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
160 * lapic timer advance (tscdeadline mode only) in nanoseconds. '-1' enables
161 * adaptive tuning starting from default advancement of 1000ns. '0' disables
162 * advancement entirely. Any other value is used as-is and disables adaptive
163 * tuning, i.e. allows privileged userspace to set an exact advancement time.
165 static int __read_mostly lapic_timer_advance_ns = -1;
166 module_param(lapic_timer_advance_ns, int, S_IRUGO | S_IWUSR);
168 static bool __read_mostly vector_hashing = true;
169 module_param(vector_hashing, bool, S_IRUGO);
171 bool __read_mostly enable_vmware_backdoor = false;
172 module_param(enable_vmware_backdoor, bool, S_IRUGO);
173 EXPORT_SYMBOL_GPL(enable_vmware_backdoor);
176 * Flags to manipulate forced emulation behavior (any non-zero value will
177 * enable forced emulation).
179 #define KVM_FEP_CLEAR_RFLAGS_RF BIT(1)
180 static int __read_mostly force_emulation_prefix;
181 module_param(force_emulation_prefix, int, 0644);
183 int __read_mostly pi_inject_timer = -1;
184 module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR);
186 /* Enable/disable PMU virtualization */
187 bool __read_mostly enable_pmu = true;
188 EXPORT_SYMBOL_GPL(enable_pmu);
189 module_param(enable_pmu, bool, 0444);
191 bool __read_mostly eager_page_split = true;
192 module_param(eager_page_split, bool, 0644);
195 * Restoring the host value for MSRs that are only consumed when running in
196 * usermode, e.g. SYSCALL MSRs and TSC_AUX, can be deferred until the CPU
197 * returns to userspace, i.e. the kernel can run with the guest's value.
199 #define KVM_MAX_NR_USER_RETURN_MSRS 16
201 struct kvm_user_return_msrs {
202 struct user_return_notifier urn;
204 struct kvm_user_return_msr_values {
207 } values[KVM_MAX_NR_USER_RETURN_MSRS];
210 u32 __read_mostly kvm_nr_uret_msrs;
211 EXPORT_SYMBOL_GPL(kvm_nr_uret_msrs);
212 static u32 __read_mostly kvm_uret_msrs_list[KVM_MAX_NR_USER_RETURN_MSRS];
213 static struct kvm_user_return_msrs __percpu *user_return_msrs;
215 #define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
216 | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
217 | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \
218 | XFEATURE_MASK_PKRU | XFEATURE_MASK_XTILE)
220 u64 __read_mostly host_efer;
221 EXPORT_SYMBOL_GPL(host_efer);
223 bool __read_mostly allow_smaller_maxphyaddr = 0;
224 EXPORT_SYMBOL_GPL(allow_smaller_maxphyaddr);
226 bool __read_mostly enable_apicv = true;
227 EXPORT_SYMBOL_GPL(enable_apicv);
229 u64 __read_mostly host_xss;
230 EXPORT_SYMBOL_GPL(host_xss);
232 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
233 KVM_GENERIC_VM_STATS(),
234 STATS_DESC_COUNTER(VM, mmu_shadow_zapped),
235 STATS_DESC_COUNTER(VM, mmu_pte_write),
236 STATS_DESC_COUNTER(VM, mmu_pde_zapped),
237 STATS_DESC_COUNTER(VM, mmu_flooded),
238 STATS_DESC_COUNTER(VM, mmu_recycled),
239 STATS_DESC_COUNTER(VM, mmu_cache_miss),
240 STATS_DESC_ICOUNTER(VM, mmu_unsync),
241 STATS_DESC_ICOUNTER(VM, pages_4k),
242 STATS_DESC_ICOUNTER(VM, pages_2m),
243 STATS_DESC_ICOUNTER(VM, pages_1g),
244 STATS_DESC_ICOUNTER(VM, nx_lpage_splits),
245 STATS_DESC_PCOUNTER(VM, max_mmu_rmap_size),
246 STATS_DESC_PCOUNTER(VM, max_mmu_page_hash_collisions)
249 const struct kvm_stats_header kvm_vm_stats_header = {
250 .name_size = KVM_STATS_NAME_SIZE,
251 .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
252 .id_offset = sizeof(struct kvm_stats_header),
253 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
254 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
255 sizeof(kvm_vm_stats_desc),
258 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
259 KVM_GENERIC_VCPU_STATS(),
260 STATS_DESC_COUNTER(VCPU, pf_taken),
261 STATS_DESC_COUNTER(VCPU, pf_fixed),
262 STATS_DESC_COUNTER(VCPU, pf_emulate),
263 STATS_DESC_COUNTER(VCPU, pf_spurious),
264 STATS_DESC_COUNTER(VCPU, pf_fast),
265 STATS_DESC_COUNTER(VCPU, pf_mmio_spte_created),
266 STATS_DESC_COUNTER(VCPU, pf_guest),
267 STATS_DESC_COUNTER(VCPU, tlb_flush),
268 STATS_DESC_COUNTER(VCPU, invlpg),
269 STATS_DESC_COUNTER(VCPU, exits),
270 STATS_DESC_COUNTER(VCPU, io_exits),
271 STATS_DESC_COUNTER(VCPU, mmio_exits),
272 STATS_DESC_COUNTER(VCPU, signal_exits),
273 STATS_DESC_COUNTER(VCPU, irq_window_exits),
274 STATS_DESC_COUNTER(VCPU, nmi_window_exits),
275 STATS_DESC_COUNTER(VCPU, l1d_flush),
276 STATS_DESC_COUNTER(VCPU, halt_exits),
277 STATS_DESC_COUNTER(VCPU, request_irq_exits),
278 STATS_DESC_COUNTER(VCPU, irq_exits),
279 STATS_DESC_COUNTER(VCPU, host_state_reload),
280 STATS_DESC_COUNTER(VCPU, fpu_reload),
281 STATS_DESC_COUNTER(VCPU, insn_emulation),
282 STATS_DESC_COUNTER(VCPU, insn_emulation_fail),
283 STATS_DESC_COUNTER(VCPU, hypercalls),
284 STATS_DESC_COUNTER(VCPU, irq_injections),
285 STATS_DESC_COUNTER(VCPU, nmi_injections),
286 STATS_DESC_COUNTER(VCPU, req_event),
287 STATS_DESC_COUNTER(VCPU, nested_run),
288 STATS_DESC_COUNTER(VCPU, directed_yield_attempted),
289 STATS_DESC_COUNTER(VCPU, directed_yield_successful),
290 STATS_DESC_COUNTER(VCPU, preemption_reported),
291 STATS_DESC_COUNTER(VCPU, preemption_other),
292 STATS_DESC_IBOOLEAN(VCPU, guest_mode),
293 STATS_DESC_COUNTER(VCPU, notify_window_exits),
296 const struct kvm_stats_header kvm_vcpu_stats_header = {
297 .name_size = KVM_STATS_NAME_SIZE,
298 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
299 .id_offset = sizeof(struct kvm_stats_header),
300 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
301 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
302 sizeof(kvm_vcpu_stats_desc),
305 u64 __read_mostly host_xcr0;
307 static struct kmem_cache *x86_emulator_cache;
310 * When called, it means the previous get/set msr reached an invalid msr.
311 * Return true if we want to ignore/silent this failed msr access.
313 static bool kvm_msr_ignored_check(u32 msr, u64 data, bool write)
315 const char *op = write ? "wrmsr" : "rdmsr";
318 if (report_ignored_msrs)
319 kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n",
324 kvm_debug_ratelimited("unhandled %s: 0x%x data 0x%llx\n",
330 static struct kmem_cache *kvm_alloc_emulator_cache(void)
332 unsigned int useroffset = offsetof(struct x86_emulate_ctxt, src);
333 unsigned int size = sizeof(struct x86_emulate_ctxt);
335 return kmem_cache_create_usercopy("x86_emulator", size,
336 __alignof__(struct x86_emulate_ctxt),
337 SLAB_ACCOUNT, useroffset,
338 size - useroffset, NULL);
341 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
343 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
346 for (i = 0; i < ASYNC_PF_PER_VCPU; i++)
347 vcpu->arch.apf.gfns[i] = ~0;
350 static void kvm_on_user_return(struct user_return_notifier *urn)
353 struct kvm_user_return_msrs *msrs
354 = container_of(urn, struct kvm_user_return_msrs, urn);
355 struct kvm_user_return_msr_values *values;
359 * Disabling irqs at this point since the following code could be
360 * interrupted and executed through kvm_arch_hardware_disable()
362 local_irq_save(flags);
363 if (msrs->registered) {
364 msrs->registered = false;
365 user_return_notifier_unregister(urn);
367 local_irq_restore(flags);
368 for (slot = 0; slot < kvm_nr_uret_msrs; ++slot) {
369 values = &msrs->values[slot];
370 if (values->host != values->curr) {
371 wrmsrl(kvm_uret_msrs_list[slot], values->host);
372 values->curr = values->host;
377 static int kvm_probe_user_return_msr(u32 msr)
383 ret = rdmsrl_safe(msr, &val);
386 ret = wrmsrl_safe(msr, val);
392 int kvm_add_user_return_msr(u32 msr)
394 BUG_ON(kvm_nr_uret_msrs >= KVM_MAX_NR_USER_RETURN_MSRS);
396 if (kvm_probe_user_return_msr(msr))
399 kvm_uret_msrs_list[kvm_nr_uret_msrs] = msr;
400 return kvm_nr_uret_msrs++;
402 EXPORT_SYMBOL_GPL(kvm_add_user_return_msr);
404 int kvm_find_user_return_msr(u32 msr)
408 for (i = 0; i < kvm_nr_uret_msrs; ++i) {
409 if (kvm_uret_msrs_list[i] == msr)
414 EXPORT_SYMBOL_GPL(kvm_find_user_return_msr);
416 static void kvm_user_return_msr_cpu_online(void)
418 unsigned int cpu = smp_processor_id();
419 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
423 for (i = 0; i < kvm_nr_uret_msrs; ++i) {
424 rdmsrl_safe(kvm_uret_msrs_list[i], &value);
425 msrs->values[i].host = value;
426 msrs->values[i].curr = value;
430 int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask)
432 unsigned int cpu = smp_processor_id();
433 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
436 value = (value & mask) | (msrs->values[slot].host & ~mask);
437 if (value == msrs->values[slot].curr)
439 err = wrmsrl_safe(kvm_uret_msrs_list[slot], value);
443 msrs->values[slot].curr = value;
444 if (!msrs->registered) {
445 msrs->urn.on_user_return = kvm_on_user_return;
446 user_return_notifier_register(&msrs->urn);
447 msrs->registered = true;
451 EXPORT_SYMBOL_GPL(kvm_set_user_return_msr);
453 static void drop_user_return_notifiers(void)
455 unsigned int cpu = smp_processor_id();
456 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
458 if (msrs->registered)
459 kvm_on_user_return(&msrs->urn);
462 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
464 return vcpu->arch.apic_base;
467 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu)
469 return kvm_apic_mode(kvm_get_apic_base(vcpu));
471 EXPORT_SYMBOL_GPL(kvm_get_apic_mode);
473 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
475 enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
476 enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
477 u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff |
478 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);
480 if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
482 if (!msr_info->host_initiated) {
483 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
485 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
489 kvm_lapic_set_base(vcpu, msr_info->data);
490 kvm_recalculate_apic_map(vcpu->kvm);
495 * Handle a fault on a hardware virtualization (VMX or SVM) instruction.
497 * Hardware virtualization extension instructions may fault if a reboot turns
498 * off virtualization while processes are running. Usually after catching the
499 * fault we just panic; during reboot instead the instruction is ignored.
501 noinstr void kvm_spurious_fault(void)
503 /* Fault while not rebooting. We want the trace. */
504 BUG_ON(!kvm_rebooting);
506 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
508 #define EXCPT_BENIGN 0
509 #define EXCPT_CONTRIBUTORY 1
512 static int exception_class(int vector)
522 return EXCPT_CONTRIBUTORY;
529 #define EXCPT_FAULT 0
531 #define EXCPT_ABORT 2
532 #define EXCPT_INTERRUPT 3
535 static int exception_type(int vector)
539 if (WARN_ON(vector > 31 || vector == NMI_VECTOR))
540 return EXCPT_INTERRUPT;
545 * #DBs can be trap-like or fault-like, the caller must check other CPU
546 * state, e.g. DR6, to determine whether a #DB is a trap or fault.
548 if (mask & (1 << DB_VECTOR))
551 if (mask & ((1 << BP_VECTOR) | (1 << OF_VECTOR)))
554 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR)))
557 /* Reserved exceptions will result in fault */
561 void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu,
562 struct kvm_queued_exception *ex)
564 if (!ex->has_payload)
567 switch (ex->vector) {
570 * "Certain debug exceptions may clear bit 0-3. The
571 * remaining contents of the DR6 register are never
572 * cleared by the processor".
574 vcpu->arch.dr6 &= ~DR_TRAP_BITS;
576 * In order to reflect the #DB exception payload in guest
577 * dr6, three components need to be considered: active low
578 * bit, FIXED_1 bits and active high bits (e.g. DR6_BD,
580 * DR6_ACTIVE_LOW contains the FIXED_1 and active low bits.
581 * In the target guest dr6:
582 * FIXED_1 bits should always be set.
583 * Active low bits should be cleared if 1-setting in payload.
584 * Active high bits should be set if 1-setting in payload.
586 * Note, the payload is compatible with the pending debug
587 * exceptions/exit qualification under VMX, that active_low bits
588 * are active high in payload.
589 * So they need to be flipped for DR6.
591 vcpu->arch.dr6 |= DR6_ACTIVE_LOW;
592 vcpu->arch.dr6 |= ex->payload;
593 vcpu->arch.dr6 ^= ex->payload & DR6_ACTIVE_LOW;
596 * The #DB payload is defined as compatible with the 'pending
597 * debug exceptions' field under VMX, not DR6. While bit 12 is
598 * defined in the 'pending debug exceptions' field (enabled
599 * breakpoint), it is reserved and must be zero in DR6.
601 vcpu->arch.dr6 &= ~BIT(12);
604 vcpu->arch.cr2 = ex->payload;
608 ex->has_payload = false;
611 EXPORT_SYMBOL_GPL(kvm_deliver_exception_payload);
613 static void kvm_queue_exception_vmexit(struct kvm_vcpu *vcpu, unsigned int vector,
614 bool has_error_code, u32 error_code,
615 bool has_payload, unsigned long payload)
617 struct kvm_queued_exception *ex = &vcpu->arch.exception_vmexit;
620 ex->injected = false;
622 ex->has_error_code = has_error_code;
623 ex->error_code = error_code;
624 ex->has_payload = has_payload;
625 ex->payload = payload;
628 /* Forcibly leave the nested mode in cases like a vCPU reset */
629 static void kvm_leave_nested(struct kvm_vcpu *vcpu)
631 kvm_x86_ops.nested_ops->leave_nested(vcpu);
634 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
635 unsigned nr, bool has_error, u32 error_code,
636 bool has_payload, unsigned long payload, bool reinject)
641 kvm_make_request(KVM_REQ_EVENT, vcpu);
644 * If the exception is destined for L2 and isn't being reinjected,
645 * morph it to a VM-Exit if L1 wants to intercept the exception. A
646 * previously injected exception is not checked because it was checked
647 * when it was original queued, and re-checking is incorrect if _L1_
648 * injected the exception, in which case it's exempt from interception.
650 if (!reinject && is_guest_mode(vcpu) &&
651 kvm_x86_ops.nested_ops->is_exception_vmexit(vcpu, nr, error_code)) {
652 kvm_queue_exception_vmexit(vcpu, nr, has_error, error_code,
653 has_payload, payload);
657 if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) {
661 * On VM-Entry, an exception can be pending if and only
662 * if event injection was blocked by nested_run_pending.
663 * In that case, however, vcpu_enter_guest() requests an
664 * immediate exit, and the guest shouldn't proceed far
665 * enough to need reinjection.
667 WARN_ON_ONCE(kvm_is_exception_pending(vcpu));
668 vcpu->arch.exception.injected = true;
669 if (WARN_ON_ONCE(has_payload)) {
671 * A reinjected event has already
672 * delivered its payload.
678 vcpu->arch.exception.pending = true;
679 vcpu->arch.exception.injected = false;
681 vcpu->arch.exception.has_error_code = has_error;
682 vcpu->arch.exception.vector = nr;
683 vcpu->arch.exception.error_code = error_code;
684 vcpu->arch.exception.has_payload = has_payload;
685 vcpu->arch.exception.payload = payload;
686 if (!is_guest_mode(vcpu))
687 kvm_deliver_exception_payload(vcpu,
688 &vcpu->arch.exception);
692 /* to check exception */
693 prev_nr = vcpu->arch.exception.vector;
694 if (prev_nr == DF_VECTOR) {
695 /* triple fault -> shutdown */
696 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
699 class1 = exception_class(prev_nr);
700 class2 = exception_class(nr);
701 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) ||
702 (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
704 * Synthesize #DF. Clear the previously injected or pending
705 * exception so as not to incorrectly trigger shutdown.
707 vcpu->arch.exception.injected = false;
708 vcpu->arch.exception.pending = false;
710 kvm_queue_exception_e(vcpu, DF_VECTOR, 0);
712 /* replace previous exception with a new one in a hope
713 that instruction re-execution will regenerate lost
719 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
721 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, false);
723 EXPORT_SYMBOL_GPL(kvm_queue_exception);
725 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
727 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, true);
729 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
731 void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr,
732 unsigned long payload)
734 kvm_multiple_exception(vcpu, nr, false, 0, true, payload, false);
736 EXPORT_SYMBOL_GPL(kvm_queue_exception_p);
738 static void kvm_queue_exception_e_p(struct kvm_vcpu *vcpu, unsigned nr,
739 u32 error_code, unsigned long payload)
741 kvm_multiple_exception(vcpu, nr, true, error_code,
742 true, payload, false);
745 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
748 kvm_inject_gp(vcpu, 0);
750 return kvm_skip_emulated_instruction(vcpu);
754 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
756 static int complete_emulated_insn_gp(struct kvm_vcpu *vcpu, int err)
759 kvm_inject_gp(vcpu, 0);
763 return kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE | EMULTYPE_SKIP |
764 EMULTYPE_COMPLETE_USER_EXIT);
767 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
769 ++vcpu->stat.pf_guest;
772 * Async #PF in L2 is always forwarded to L1 as a VM-Exit regardless of
773 * whether or not L1 wants to intercept "regular" #PF.
775 if (is_guest_mode(vcpu) && fault->async_page_fault)
776 kvm_queue_exception_vmexit(vcpu, PF_VECTOR,
777 true, fault->error_code,
778 true, fault->address);
780 kvm_queue_exception_e_p(vcpu, PF_VECTOR, fault->error_code,
784 void kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
785 struct x86_exception *fault)
787 struct kvm_mmu *fault_mmu;
788 WARN_ON_ONCE(fault->vector != PF_VECTOR);
790 fault_mmu = fault->nested_page_fault ? vcpu->arch.mmu :
794 * Invalidate the TLB entry for the faulting address, if it exists,
795 * else the access will fault indefinitely (and to emulate hardware).
797 if ((fault->error_code & PFERR_PRESENT_MASK) &&
798 !(fault->error_code & PFERR_RSVD_MASK))
799 kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address,
800 fault_mmu->root.hpa);
802 fault_mmu->inject_page_fault(vcpu, fault);
804 EXPORT_SYMBOL_GPL(kvm_inject_emulated_page_fault);
806 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
808 atomic_inc(&vcpu->arch.nmi_queued);
809 kvm_make_request(KVM_REQ_NMI, vcpu);
812 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
814 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, false);
816 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
818 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
820 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, true);
822 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
825 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
826 * a #GP and return false.
828 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
830 if (static_call(kvm_x86_get_cpl)(vcpu) <= required_cpl)
832 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
836 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr)
838 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE))
841 kvm_queue_exception(vcpu, UD_VECTOR);
844 EXPORT_SYMBOL_GPL(kvm_require_dr);
846 static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu)
848 return vcpu->arch.reserved_gpa_bits | rsvd_bits(5, 8) | rsvd_bits(1, 2);
852 * Load the pae pdptrs. Return 1 if they are all valid, 0 otherwise.
854 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
856 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
857 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
861 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
864 * If the MMU is nested, CR3 holds an L2 GPA and needs to be translated
867 real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(pdpt_gfn),
868 PFERR_USER_MASK | PFERR_WRITE_MASK, NULL);
869 if (real_gpa == INVALID_GPA)
872 /* Note the offset, PDPTRs are 32 byte aligned when using PAE paging. */
873 ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(real_gpa), pdpte,
874 cr3 & GENMASK(11, 5), sizeof(pdpte));
878 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
879 if ((pdpte[i] & PT_PRESENT_MASK) &&
880 (pdpte[i] & pdptr_rsvd_bits(vcpu))) {
886 * Marking VCPU_EXREG_PDPTR dirty doesn't work for !tdp_enabled.
887 * Shadow page roots need to be reconstructed instead.
889 if (!tdp_enabled && memcmp(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)))
890 kvm_mmu_free_roots(vcpu->kvm, mmu, KVM_MMU_ROOT_CURRENT);
892 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
893 kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
894 kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
895 vcpu->arch.pdptrs_from_userspace = false;
899 EXPORT_SYMBOL_GPL(load_pdptrs);
901 void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0)
903 if ((cr0 ^ old_cr0) & X86_CR0_PG) {
904 kvm_clear_async_pf_completion_queue(vcpu);
905 kvm_async_pf_hash_reset(vcpu);
908 * Clearing CR0.PG is defined to flush the TLB from the guest's
911 if (!(cr0 & X86_CR0_PG))
912 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
915 if ((cr0 ^ old_cr0) & KVM_MMU_CR0_ROLE_BITS)
916 kvm_mmu_reset_context(vcpu);
918 if (((cr0 ^ old_cr0) & X86_CR0_CD) &&
919 kvm_arch_has_noncoherent_dma(vcpu->kvm) &&
920 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
921 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL);
923 EXPORT_SYMBOL_GPL(kvm_post_set_cr0);
925 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
927 unsigned long old_cr0 = kvm_read_cr0(vcpu);
932 if (cr0 & 0xffffffff00000000UL)
936 cr0 &= ~CR0_RESERVED_BITS;
938 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
941 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
945 if ((vcpu->arch.efer & EFER_LME) && !is_paging(vcpu) &&
946 (cr0 & X86_CR0_PG)) {
951 static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l);
956 if (!(vcpu->arch.efer & EFER_LME) && (cr0 & X86_CR0_PG) &&
957 is_pae(vcpu) && ((cr0 ^ old_cr0) & X86_CR0_PDPTR_BITS) &&
958 !load_pdptrs(vcpu, kvm_read_cr3(vcpu)))
961 if (!(cr0 & X86_CR0_PG) &&
962 (is_64_bit_mode(vcpu) || kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)))
965 static_call(kvm_x86_set_cr0)(vcpu, cr0);
967 kvm_post_set_cr0(vcpu, old_cr0, cr0);
971 EXPORT_SYMBOL_GPL(kvm_set_cr0);
973 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
975 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
977 EXPORT_SYMBOL_GPL(kvm_lmsw);
979 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu)
981 if (vcpu->arch.guest_state_protected)
984 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) {
986 if (vcpu->arch.xcr0 != host_xcr0)
987 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
989 if (vcpu->arch.xsaves_enabled &&
990 vcpu->arch.ia32_xss != host_xss)
991 wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss);
994 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
995 if (static_cpu_has(X86_FEATURE_PKU) &&
996 vcpu->arch.pkru != vcpu->arch.host_pkru &&
997 ((vcpu->arch.xcr0 & XFEATURE_MASK_PKRU) ||
998 kvm_read_cr4_bits(vcpu, X86_CR4_PKE)))
999 write_pkru(vcpu->arch.pkru);
1000 #endif /* CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS */
1002 EXPORT_SYMBOL_GPL(kvm_load_guest_xsave_state);
1004 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu)
1006 if (vcpu->arch.guest_state_protected)
1009 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1010 if (static_cpu_has(X86_FEATURE_PKU) &&
1011 ((vcpu->arch.xcr0 & XFEATURE_MASK_PKRU) ||
1012 kvm_read_cr4_bits(vcpu, X86_CR4_PKE))) {
1013 vcpu->arch.pkru = rdpkru();
1014 if (vcpu->arch.pkru != vcpu->arch.host_pkru)
1015 write_pkru(vcpu->arch.host_pkru);
1017 #endif /* CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS */
1019 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) {
1021 if (vcpu->arch.xcr0 != host_xcr0)
1022 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
1024 if (vcpu->arch.xsaves_enabled &&
1025 vcpu->arch.ia32_xss != host_xss)
1026 wrmsrl(MSR_IA32_XSS, host_xss);
1030 EXPORT_SYMBOL_GPL(kvm_load_host_xsave_state);
1032 #ifdef CONFIG_X86_64
1033 static inline u64 kvm_guest_supported_xfd(struct kvm_vcpu *vcpu)
1035 return vcpu->arch.guest_supported_xcr0 & XFEATURE_MASK_USER_DYNAMIC;
1039 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
1042 u64 old_xcr0 = vcpu->arch.xcr0;
1045 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
1046 if (index != XCR_XFEATURE_ENABLED_MASK)
1048 if (!(xcr0 & XFEATURE_MASK_FP))
1050 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE))
1054 * Do not allow the guest to set bits that we do not support
1055 * saving. However, xcr0 bit 0 is always set, even if the
1056 * emulated CPU does not support XSAVE (see kvm_vcpu_reset()).
1058 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
1059 if (xcr0 & ~valid_bits)
1062 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) !=
1063 (!(xcr0 & XFEATURE_MASK_BNDCSR)))
1066 if (xcr0 & XFEATURE_MASK_AVX512) {
1067 if (!(xcr0 & XFEATURE_MASK_YMM))
1069 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
1073 if ((xcr0 & XFEATURE_MASK_XTILE) &&
1074 ((xcr0 & XFEATURE_MASK_XTILE) != XFEATURE_MASK_XTILE))
1077 vcpu->arch.xcr0 = xcr0;
1079 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
1080 kvm_update_cpuid_runtime(vcpu);
1084 int kvm_emulate_xsetbv(struct kvm_vcpu *vcpu)
1086 /* Note, #UD due to CR4.OSXSAVE=0 has priority over the intercept. */
1087 if (static_call(kvm_x86_get_cpl)(vcpu) != 0 ||
1088 __kvm_set_xcr(vcpu, kvm_rcx_read(vcpu), kvm_read_edx_eax(vcpu))) {
1089 kvm_inject_gp(vcpu, 0);
1093 return kvm_skip_emulated_instruction(vcpu);
1095 EXPORT_SYMBOL_GPL(kvm_emulate_xsetbv);
1097 bool __kvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1099 if (cr4 & cr4_reserved_bits)
1102 if (cr4 & vcpu->arch.cr4_guest_rsvd_bits)
1107 EXPORT_SYMBOL_GPL(__kvm_is_valid_cr4);
1109 static bool kvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1111 return __kvm_is_valid_cr4(vcpu, cr4) &&
1112 static_call(kvm_x86_is_valid_cr4)(vcpu, cr4);
1115 void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4)
1117 if ((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS)
1118 kvm_mmu_reset_context(vcpu);
1121 * If CR4.PCIDE is changed 0 -> 1, there is no need to flush the TLB
1122 * according to the SDM; however, stale prev_roots could be reused
1123 * incorrectly in the future after a MOV to CR3 with NOFLUSH=1, so we
1124 * free them all. This is *not* a superset of KVM_REQ_TLB_FLUSH_GUEST
1125 * or KVM_REQ_TLB_FLUSH_CURRENT, because the hardware TLB is not flushed,
1129 (cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE))
1130 kvm_mmu_unload(vcpu);
1133 * The TLB has to be flushed for all PCIDs if any of the following
1134 * (architecturally required) changes happen:
1135 * - CR4.PCIDE is changed from 1 to 0
1136 * - CR4.PGE is toggled
1138 * This is a superset of KVM_REQ_TLB_FLUSH_CURRENT.
1140 if (((cr4 ^ old_cr4) & X86_CR4_PGE) ||
1141 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
1142 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
1145 * The TLB has to be flushed for the current PCID if any of the
1146 * following (architecturally required) changes happen:
1147 * - CR4.SMEP is changed from 0 to 1
1148 * - CR4.PAE is toggled
1150 else if (((cr4 ^ old_cr4) & X86_CR4_PAE) ||
1151 ((cr4 & X86_CR4_SMEP) && !(old_cr4 & X86_CR4_SMEP)))
1152 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
1155 EXPORT_SYMBOL_GPL(kvm_post_set_cr4);
1157 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1159 unsigned long old_cr4 = kvm_read_cr4(vcpu);
1161 if (!kvm_is_valid_cr4(vcpu, cr4))
1164 if (is_long_mode(vcpu)) {
1165 if (!(cr4 & X86_CR4_PAE))
1167 if ((cr4 ^ old_cr4) & X86_CR4_LA57)
1169 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
1170 && ((cr4 ^ old_cr4) & X86_CR4_PDPTR_BITS)
1171 && !load_pdptrs(vcpu, kvm_read_cr3(vcpu)))
1174 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
1175 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID))
1178 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
1179 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
1183 static_call(kvm_x86_set_cr4)(vcpu, cr4);
1185 kvm_post_set_cr4(vcpu, old_cr4, cr4);
1189 EXPORT_SYMBOL_GPL(kvm_set_cr4);
1191 static void kvm_invalidate_pcid(struct kvm_vcpu *vcpu, unsigned long pcid)
1193 struct kvm_mmu *mmu = vcpu->arch.mmu;
1194 unsigned long roots_to_free = 0;
1198 * MOV CR3 and INVPCID are usually not intercepted when using TDP, but
1199 * this is reachable when running EPT=1 and unrestricted_guest=0, and
1200 * also via the emulator. KVM's TDP page tables are not in the scope of
1201 * the invalidation, but the guest's TLB entries need to be flushed as
1202 * the CPU may have cached entries in its TLB for the target PCID.
1204 if (unlikely(tdp_enabled)) {
1205 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
1210 * If neither the current CR3 nor any of the prev_roots use the given
1211 * PCID, then nothing needs to be done here because a resync will
1212 * happen anyway before switching to any other CR3.
1214 if (kvm_get_active_pcid(vcpu) == pcid) {
1215 kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
1216 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
1220 * If PCID is disabled, there is no need to free prev_roots even if the
1221 * PCIDs for them are also 0, because MOV to CR3 always flushes the TLB
1224 if (!kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
1227 for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
1228 if (kvm_get_pcid(vcpu, mmu->prev_roots[i].pgd) == pcid)
1229 roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
1231 kvm_mmu_free_roots(vcpu->kvm, mmu, roots_to_free);
1234 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1236 bool skip_tlb_flush = false;
1237 unsigned long pcid = 0;
1238 #ifdef CONFIG_X86_64
1239 bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE);
1242 skip_tlb_flush = cr3 & X86_CR3_PCID_NOFLUSH;
1243 cr3 &= ~X86_CR3_PCID_NOFLUSH;
1244 pcid = cr3 & X86_CR3_PCID_MASK;
1248 /* PDPTRs are always reloaded for PAE paging. */
1249 if (cr3 == kvm_read_cr3(vcpu) && !is_pae_paging(vcpu))
1250 goto handle_tlb_flush;
1253 * Do not condition the GPA check on long mode, this helper is used to
1254 * stuff CR3, e.g. for RSM emulation, and there is no guarantee that
1255 * the current vCPU mode is accurate.
1257 if (kvm_vcpu_is_illegal_gpa(vcpu, cr3))
1260 if (is_pae_paging(vcpu) && !load_pdptrs(vcpu, cr3))
1263 if (cr3 != kvm_read_cr3(vcpu))
1264 kvm_mmu_new_pgd(vcpu, cr3);
1266 vcpu->arch.cr3 = cr3;
1267 kvm_register_mark_dirty(vcpu, VCPU_EXREG_CR3);
1268 /* Do not call post_set_cr3, we do not get here for confidential guests. */
1272 * A load of CR3 that flushes the TLB flushes only the current PCID,
1273 * even if PCID is disabled, in which case PCID=0 is flushed. It's a
1274 * moot point in the end because _disabling_ PCID will flush all PCIDs,
1275 * and it's impossible to use a non-zero PCID when PCID is disabled,
1276 * i.e. only PCID=0 can be relevant.
1278 if (!skip_tlb_flush)
1279 kvm_invalidate_pcid(vcpu, pcid);
1283 EXPORT_SYMBOL_GPL(kvm_set_cr3);
1285 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
1287 if (cr8 & CR8_RESERVED_BITS)
1289 if (lapic_in_kernel(vcpu))
1290 kvm_lapic_set_tpr(vcpu, cr8);
1292 vcpu->arch.cr8 = cr8;
1295 EXPORT_SYMBOL_GPL(kvm_set_cr8);
1297 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
1299 if (lapic_in_kernel(vcpu))
1300 return kvm_lapic_get_cr8(vcpu);
1302 return vcpu->arch.cr8;
1304 EXPORT_SYMBOL_GPL(kvm_get_cr8);
1306 static void kvm_update_dr0123(struct kvm_vcpu *vcpu)
1310 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
1311 for (i = 0; i < KVM_NR_DB_REGS; i++)
1312 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
1316 void kvm_update_dr7(struct kvm_vcpu *vcpu)
1320 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1321 dr7 = vcpu->arch.guest_debug_dr7;
1323 dr7 = vcpu->arch.dr7;
1324 static_call(kvm_x86_set_dr7)(vcpu, dr7);
1325 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED;
1326 if (dr7 & DR7_BP_EN_MASK)
1327 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED;
1329 EXPORT_SYMBOL_GPL(kvm_update_dr7);
1331 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu)
1333 u64 fixed = DR6_FIXED_1;
1335 if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM))
1338 if (!guest_cpuid_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT))
1339 fixed |= DR6_BUS_LOCK;
1343 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
1345 size_t size = ARRAY_SIZE(vcpu->arch.db);
1349 vcpu->arch.db[array_index_nospec(dr, size)] = val;
1350 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
1351 vcpu->arch.eff_db[dr] = val;
1355 if (!kvm_dr6_valid(val))
1357 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
1361 if (!kvm_dr7_valid(val))
1363 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
1364 kvm_update_dr7(vcpu);
1370 EXPORT_SYMBOL_GPL(kvm_set_dr);
1372 void kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
1374 size_t size = ARRAY_SIZE(vcpu->arch.db);
1378 *val = vcpu->arch.db[array_index_nospec(dr, size)];
1382 *val = vcpu->arch.dr6;
1386 *val = vcpu->arch.dr7;
1390 EXPORT_SYMBOL_GPL(kvm_get_dr);
1392 int kvm_emulate_rdpmc(struct kvm_vcpu *vcpu)
1394 u32 ecx = kvm_rcx_read(vcpu);
1397 if (kvm_pmu_rdpmc(vcpu, ecx, &data)) {
1398 kvm_inject_gp(vcpu, 0);
1402 kvm_rax_write(vcpu, (u32)data);
1403 kvm_rdx_write(vcpu, data >> 32);
1404 return kvm_skip_emulated_instruction(vcpu);
1406 EXPORT_SYMBOL_GPL(kvm_emulate_rdpmc);
1409 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1410 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1412 * The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features)
1413 * extract the supported MSRs from the related const lists.
1414 * msrs_to_save is selected from the msrs_to_save_all to reflect the
1415 * capabilities of the host cpu. This capabilities test skips MSRs that are
1416 * kvm-specific. Those are put in emulated_msrs_all; filtering of emulated_msrs
1417 * may depend on host virtualization features rather than host cpu features.
1420 static const u32 msrs_to_save_all[] = {
1421 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1423 #ifdef CONFIG_X86_64
1424 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1426 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
1427 MSR_IA32_FEAT_CTL, MSR_IA32_BNDCFGS, MSR_TSC_AUX,
1429 MSR_IA32_RTIT_CTL, MSR_IA32_RTIT_STATUS, MSR_IA32_RTIT_CR3_MATCH,
1430 MSR_IA32_RTIT_OUTPUT_BASE, MSR_IA32_RTIT_OUTPUT_MASK,
1431 MSR_IA32_RTIT_ADDR0_A, MSR_IA32_RTIT_ADDR0_B,
1432 MSR_IA32_RTIT_ADDR1_A, MSR_IA32_RTIT_ADDR1_B,
1433 MSR_IA32_RTIT_ADDR2_A, MSR_IA32_RTIT_ADDR2_B,
1434 MSR_IA32_RTIT_ADDR3_A, MSR_IA32_RTIT_ADDR3_B,
1435 MSR_IA32_UMWAIT_CONTROL,
1437 MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1,
1438 MSR_ARCH_PERFMON_FIXED_CTR0 + 2,
1439 MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS,
1440 MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL,
1441 MSR_IA32_PEBS_ENABLE, MSR_IA32_DS_AREA, MSR_PEBS_DATA_CFG,
1443 /* This part of MSRs should match KVM_INTEL_PMC_MAX_GENERIC. */
1444 MSR_ARCH_PERFMON_PERFCTR0, MSR_ARCH_PERFMON_PERFCTR1,
1445 MSR_ARCH_PERFMON_PERFCTR0 + 2, MSR_ARCH_PERFMON_PERFCTR0 + 3,
1446 MSR_ARCH_PERFMON_PERFCTR0 + 4, MSR_ARCH_PERFMON_PERFCTR0 + 5,
1447 MSR_ARCH_PERFMON_PERFCTR0 + 6, MSR_ARCH_PERFMON_PERFCTR0 + 7,
1448 MSR_ARCH_PERFMON_EVENTSEL0, MSR_ARCH_PERFMON_EVENTSEL1,
1449 MSR_ARCH_PERFMON_EVENTSEL0 + 2, MSR_ARCH_PERFMON_EVENTSEL0 + 3,
1450 MSR_ARCH_PERFMON_EVENTSEL0 + 4, MSR_ARCH_PERFMON_EVENTSEL0 + 5,
1451 MSR_ARCH_PERFMON_EVENTSEL0 + 6, MSR_ARCH_PERFMON_EVENTSEL0 + 7,
1453 MSR_K7_EVNTSEL0, MSR_K7_EVNTSEL1, MSR_K7_EVNTSEL2, MSR_K7_EVNTSEL3,
1454 MSR_K7_PERFCTR0, MSR_K7_PERFCTR1, MSR_K7_PERFCTR2, MSR_K7_PERFCTR3,
1456 /* This part of MSRs should match KVM_AMD_PMC_MAX_GENERIC. */
1457 MSR_F15H_PERF_CTL0, MSR_F15H_PERF_CTL1, MSR_F15H_PERF_CTL2,
1458 MSR_F15H_PERF_CTL3, MSR_F15H_PERF_CTL4, MSR_F15H_PERF_CTL5,
1459 MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2,
1460 MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5,
1462 MSR_IA32_XFD, MSR_IA32_XFD_ERR,
1465 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
1466 static unsigned num_msrs_to_save;
1468 static const u32 emulated_msrs_all[] = {
1469 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
1470 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
1471 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
1472 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC,
1473 HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY,
1474 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2,
1475 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL,
1477 HV_X64_MSR_VP_INDEX,
1478 HV_X64_MSR_VP_RUNTIME,
1479 HV_X64_MSR_SCONTROL,
1480 HV_X64_MSR_STIMER0_CONFIG,
1481 HV_X64_MSR_VP_ASSIST_PAGE,
1482 HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL,
1483 HV_X64_MSR_TSC_EMULATION_STATUS, HV_X64_MSR_TSC_INVARIANT_CONTROL,
1484 HV_X64_MSR_SYNDBG_OPTIONS,
1485 HV_X64_MSR_SYNDBG_CONTROL, HV_X64_MSR_SYNDBG_STATUS,
1486 HV_X64_MSR_SYNDBG_SEND_BUFFER, HV_X64_MSR_SYNDBG_RECV_BUFFER,
1487 HV_X64_MSR_SYNDBG_PENDING_BUFFER,
1489 MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
1490 MSR_KVM_PV_EOI_EN, MSR_KVM_ASYNC_PF_INT, MSR_KVM_ASYNC_PF_ACK,
1492 MSR_IA32_TSC_ADJUST,
1493 MSR_IA32_TSC_DEADLINE,
1494 MSR_IA32_ARCH_CAPABILITIES,
1495 MSR_IA32_PERF_CAPABILITIES,
1496 MSR_IA32_MISC_ENABLE,
1497 MSR_IA32_MCG_STATUS,
1499 MSR_IA32_MCG_EXT_CTL,
1503 MSR_MISC_FEATURES_ENABLES,
1504 MSR_AMD64_VIRT_SPEC_CTRL,
1505 MSR_AMD64_TSC_RATIO,
1510 * The following list leaves out MSRs whose values are determined
1511 * by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs.
1512 * We always support the "true" VMX control MSRs, even if the host
1513 * processor does not, so I am putting these registers here rather
1514 * than in msrs_to_save_all.
1517 MSR_IA32_VMX_TRUE_PINBASED_CTLS,
1518 MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
1519 MSR_IA32_VMX_TRUE_EXIT_CTLS,
1520 MSR_IA32_VMX_TRUE_ENTRY_CTLS,
1522 MSR_IA32_VMX_CR0_FIXED0,
1523 MSR_IA32_VMX_CR4_FIXED0,
1524 MSR_IA32_VMX_VMCS_ENUM,
1525 MSR_IA32_VMX_PROCBASED_CTLS2,
1526 MSR_IA32_VMX_EPT_VPID_CAP,
1527 MSR_IA32_VMX_VMFUNC,
1530 MSR_KVM_POLL_CONTROL,
1533 static u32 emulated_msrs[ARRAY_SIZE(emulated_msrs_all)];
1534 static unsigned num_emulated_msrs;
1537 * List of msr numbers which are used to expose MSR-based features that
1538 * can be used by a hypervisor to validate requested CPU features.
1540 static const u32 msr_based_features_all[] = {
1542 MSR_IA32_VMX_TRUE_PINBASED_CTLS,
1543 MSR_IA32_VMX_PINBASED_CTLS,
1544 MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
1545 MSR_IA32_VMX_PROCBASED_CTLS,
1546 MSR_IA32_VMX_TRUE_EXIT_CTLS,
1547 MSR_IA32_VMX_EXIT_CTLS,
1548 MSR_IA32_VMX_TRUE_ENTRY_CTLS,
1549 MSR_IA32_VMX_ENTRY_CTLS,
1551 MSR_IA32_VMX_CR0_FIXED0,
1552 MSR_IA32_VMX_CR0_FIXED1,
1553 MSR_IA32_VMX_CR4_FIXED0,
1554 MSR_IA32_VMX_CR4_FIXED1,
1555 MSR_IA32_VMX_VMCS_ENUM,
1556 MSR_IA32_VMX_PROCBASED_CTLS2,
1557 MSR_IA32_VMX_EPT_VPID_CAP,
1558 MSR_IA32_VMX_VMFUNC,
1562 MSR_IA32_ARCH_CAPABILITIES,
1563 MSR_IA32_PERF_CAPABILITIES,
1566 static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all)];
1567 static unsigned int num_msr_based_features;
1570 * Some IA32_ARCH_CAPABILITIES bits have dependencies on MSRs that KVM
1571 * does not yet virtualize. These include:
1572 * 10 - MISC_PACKAGE_CTRLS
1573 * 11 - ENERGY_FILTERING_CTL
1575 * 18 - FB_CLEAR_CTRL
1576 * 21 - XAPIC_DISABLE_STATUS
1577 * 23 - OVERCLOCKING_STATUS
1580 #define KVM_SUPPORTED_ARCH_CAP \
1581 (ARCH_CAP_RDCL_NO | ARCH_CAP_IBRS_ALL | ARCH_CAP_RSBA | \
1582 ARCH_CAP_SKIP_VMENTRY_L1DFLUSH | ARCH_CAP_SSB_NO | ARCH_CAP_MDS_NO | \
1583 ARCH_CAP_PSCHANGE_MC_NO | ARCH_CAP_TSX_CTRL_MSR | ARCH_CAP_TAA_NO | \
1584 ARCH_CAP_SBDR_SSDP_NO | ARCH_CAP_FBSDP_NO | ARCH_CAP_PSDP_NO | \
1585 ARCH_CAP_FB_CLEAR | ARCH_CAP_RRSBA | ARCH_CAP_PBRSB_NO)
1587 static u64 kvm_get_arch_capabilities(void)
1591 if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) {
1592 rdmsrl(MSR_IA32_ARCH_CAPABILITIES, data);
1593 data &= KVM_SUPPORTED_ARCH_CAP;
1597 * If nx_huge_pages is enabled, KVM's shadow paging will ensure that
1598 * the nested hypervisor runs with NX huge pages. If it is not,
1599 * L1 is anyway vulnerable to ITLB_MULTIHIT exploits from other
1600 * L1 guests, so it need not worry about its own (L2) guests.
1602 data |= ARCH_CAP_PSCHANGE_MC_NO;
1605 * If we're doing cache flushes (either "always" or "cond")
1606 * we will do one whenever the guest does a vmlaunch/vmresume.
1607 * If an outer hypervisor is doing the cache flush for us
1608 * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that
1609 * capability to the guest too, and if EPT is disabled we're not
1610 * vulnerable. Overall, only VMENTER_L1D_FLUSH_NEVER will
1611 * require a nested hypervisor to do a flush of its own.
1613 if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER)
1614 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH;
1616 if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
1617 data |= ARCH_CAP_RDCL_NO;
1618 if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
1619 data |= ARCH_CAP_SSB_NO;
1620 if (!boot_cpu_has_bug(X86_BUG_MDS))
1621 data |= ARCH_CAP_MDS_NO;
1623 if (!boot_cpu_has(X86_FEATURE_RTM)) {
1625 * If RTM=0 because the kernel has disabled TSX, the host might
1626 * have TAA_NO or TSX_CTRL. Clear TAA_NO (the guest sees RTM=0
1627 * and therefore knows that there cannot be TAA) but keep
1628 * TSX_CTRL: some buggy userspaces leave it set on tsx=on hosts,
1629 * and we want to allow migrating those guests to tsx=off hosts.
1631 data &= ~ARCH_CAP_TAA_NO;
1632 } else if (!boot_cpu_has_bug(X86_BUG_TAA)) {
1633 data |= ARCH_CAP_TAA_NO;
1636 * Nothing to do here; we emulate TSX_CTRL if present on the
1637 * host so the guest can choose between disabling TSX or
1638 * using VERW to clear CPU buffers.
1645 static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
1647 switch (msr->index) {
1648 case MSR_IA32_ARCH_CAPABILITIES:
1649 msr->data = kvm_get_arch_capabilities();
1651 case MSR_IA32_PERF_CAPABILITIES:
1652 msr->data = kvm_caps.supported_perf_cap;
1654 case MSR_IA32_UCODE_REV:
1655 rdmsrl_safe(msr->index, &msr->data);
1658 return static_call(kvm_x86_get_msr_feature)(msr);
1663 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1665 struct kvm_msr_entry msr;
1669 r = kvm_get_msr_feature(&msr);
1671 if (r == KVM_MSR_RET_INVALID) {
1672 /* Unconditionally clear the output for simplicity */
1674 if (kvm_msr_ignored_check(index, 0, false))
1686 static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1688 if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT))
1691 if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
1694 if (efer & (EFER_LME | EFER_LMA) &&
1695 !guest_cpuid_has(vcpu, X86_FEATURE_LM))
1698 if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX))
1704 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1706 if (efer & efer_reserved_bits)
1709 return __kvm_valid_efer(vcpu, efer);
1711 EXPORT_SYMBOL_GPL(kvm_valid_efer);
1713 static int set_efer(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
1715 u64 old_efer = vcpu->arch.efer;
1716 u64 efer = msr_info->data;
1719 if (efer & efer_reserved_bits)
1722 if (!msr_info->host_initiated) {
1723 if (!__kvm_valid_efer(vcpu, efer))
1726 if (is_paging(vcpu) &&
1727 (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
1732 efer |= vcpu->arch.efer & EFER_LMA;
1734 r = static_call(kvm_x86_set_efer)(vcpu, efer);
1740 if ((efer ^ old_efer) & KVM_MMU_EFER_ROLE_BITS)
1741 kvm_mmu_reset_context(vcpu);
1746 void kvm_enable_efer_bits(u64 mask)
1748 efer_reserved_bits &= ~mask;
1750 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
1752 bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type)
1754 struct kvm_x86_msr_filter *msr_filter;
1755 struct msr_bitmap_range *ranges;
1756 struct kvm *kvm = vcpu->kvm;
1761 /* x2APIC MSRs do not support filtering. */
1762 if (index >= 0x800 && index <= 0x8ff)
1765 idx = srcu_read_lock(&kvm->srcu);
1767 msr_filter = srcu_dereference(kvm->arch.msr_filter, &kvm->srcu);
1773 allowed = msr_filter->default_allow;
1774 ranges = msr_filter->ranges;
1776 for (i = 0; i < msr_filter->count; i++) {
1777 u32 start = ranges[i].base;
1778 u32 end = start + ranges[i].nmsrs;
1779 u32 flags = ranges[i].flags;
1780 unsigned long *bitmap = ranges[i].bitmap;
1782 if ((index >= start) && (index < end) && (flags & type)) {
1783 allowed = !!test_bit(index - start, bitmap);
1789 srcu_read_unlock(&kvm->srcu, idx);
1793 EXPORT_SYMBOL_GPL(kvm_msr_allowed);
1796 * Write @data into the MSR specified by @index. Select MSR specific fault
1797 * checks are bypassed if @host_initiated is %true.
1798 * Returns 0 on success, non-0 otherwise.
1799 * Assumes vcpu_load() was already called.
1801 static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data,
1802 bool host_initiated)
1804 struct msr_data msr;
1809 case MSR_KERNEL_GS_BASE:
1812 if (is_noncanonical_address(data, vcpu))
1815 case MSR_IA32_SYSENTER_EIP:
1816 case MSR_IA32_SYSENTER_ESP:
1818 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1819 * non-canonical address is written on Intel but not on
1820 * AMD (which ignores the top 32-bits, because it does
1821 * not implement 64-bit SYSENTER).
1823 * 64-bit code should hence be able to write a non-canonical
1824 * value on AMD. Making the address canonical ensures that
1825 * vmentry does not fail on Intel after writing a non-canonical
1826 * value, and that something deterministic happens if the guest
1827 * invokes 64-bit SYSENTER.
1829 data = __canonical_address(data, vcpu_virt_addr_bits(vcpu));
1832 if (!kvm_is_supported_user_return_msr(MSR_TSC_AUX))
1835 if (!host_initiated &&
1836 !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP) &&
1837 !guest_cpuid_has(vcpu, X86_FEATURE_RDPID))
1841 * Per Intel's SDM, bits 63:32 are reserved, but AMD's APM has
1842 * incomplete and conflicting architectural behavior. Current
1843 * AMD CPUs completely ignore bits 63:32, i.e. they aren't
1844 * reserved and always read as zeros. Enforce Intel's reserved
1845 * bits check if and only if the guest CPU is Intel, and clear
1846 * the bits in all other cases. This ensures cross-vendor
1847 * migration will provide consistent behavior for the guest.
1849 if (guest_cpuid_is_intel(vcpu) && (data >> 32) != 0)
1858 msr.host_initiated = host_initiated;
1860 return static_call(kvm_x86_set_msr)(vcpu, &msr);
1863 static int kvm_set_msr_ignored_check(struct kvm_vcpu *vcpu,
1864 u32 index, u64 data, bool host_initiated)
1866 int ret = __kvm_set_msr(vcpu, index, data, host_initiated);
1868 if (ret == KVM_MSR_RET_INVALID)
1869 if (kvm_msr_ignored_check(index, data, true))
1876 * Read the MSR specified by @index into @data. Select MSR specific fault
1877 * checks are bypassed if @host_initiated is %true.
1878 * Returns 0 on success, non-0 otherwise.
1879 * Assumes vcpu_load() was already called.
1881 int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data,
1882 bool host_initiated)
1884 struct msr_data msr;
1889 if (!kvm_is_supported_user_return_msr(MSR_TSC_AUX))
1892 if (!host_initiated &&
1893 !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP) &&
1894 !guest_cpuid_has(vcpu, X86_FEATURE_RDPID))
1900 msr.host_initiated = host_initiated;
1902 ret = static_call(kvm_x86_get_msr)(vcpu, &msr);
1908 static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu,
1909 u32 index, u64 *data, bool host_initiated)
1911 int ret = __kvm_get_msr(vcpu, index, data, host_initiated);
1913 if (ret == KVM_MSR_RET_INVALID) {
1914 /* Unconditionally clear *data for simplicity */
1916 if (kvm_msr_ignored_check(index, 0, false))
1923 static int kvm_get_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 *data)
1925 if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
1926 return KVM_MSR_RET_FILTERED;
1927 return kvm_get_msr_ignored_check(vcpu, index, data, false);
1930 static int kvm_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 data)
1932 if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
1933 return KVM_MSR_RET_FILTERED;
1934 return kvm_set_msr_ignored_check(vcpu, index, data, false);
1937 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data)
1939 return kvm_get_msr_ignored_check(vcpu, index, data, false);
1941 EXPORT_SYMBOL_GPL(kvm_get_msr);
1943 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
1945 return kvm_set_msr_ignored_check(vcpu, index, data, false);
1947 EXPORT_SYMBOL_GPL(kvm_set_msr);
1949 static void complete_userspace_rdmsr(struct kvm_vcpu *vcpu)
1951 if (!vcpu->run->msr.error) {
1952 kvm_rax_write(vcpu, (u32)vcpu->run->msr.data);
1953 kvm_rdx_write(vcpu, vcpu->run->msr.data >> 32);
1957 static int complete_emulated_msr_access(struct kvm_vcpu *vcpu)
1959 return complete_emulated_insn_gp(vcpu, vcpu->run->msr.error);
1962 static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu)
1964 complete_userspace_rdmsr(vcpu);
1965 return complete_emulated_msr_access(vcpu);
1968 static int complete_fast_msr_access(struct kvm_vcpu *vcpu)
1970 return static_call(kvm_x86_complete_emulated_msr)(vcpu, vcpu->run->msr.error);
1973 static int complete_fast_rdmsr(struct kvm_vcpu *vcpu)
1975 complete_userspace_rdmsr(vcpu);
1976 return complete_fast_msr_access(vcpu);
1979 static u64 kvm_msr_reason(int r)
1982 case KVM_MSR_RET_INVALID:
1983 return KVM_MSR_EXIT_REASON_UNKNOWN;
1984 case KVM_MSR_RET_FILTERED:
1985 return KVM_MSR_EXIT_REASON_FILTER;
1987 return KVM_MSR_EXIT_REASON_INVAL;
1991 static int kvm_msr_user_space(struct kvm_vcpu *vcpu, u32 index,
1992 u32 exit_reason, u64 data,
1993 int (*completion)(struct kvm_vcpu *vcpu),
1996 u64 msr_reason = kvm_msr_reason(r);
1998 /* Check if the user wanted to know about this MSR fault */
1999 if (!(vcpu->kvm->arch.user_space_msr_mask & msr_reason))
2002 vcpu->run->exit_reason = exit_reason;
2003 vcpu->run->msr.error = 0;
2004 memset(vcpu->run->msr.pad, 0, sizeof(vcpu->run->msr.pad));
2005 vcpu->run->msr.reason = msr_reason;
2006 vcpu->run->msr.index = index;
2007 vcpu->run->msr.data = data;
2008 vcpu->arch.complete_userspace_io = completion;
2013 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
2015 u32 ecx = kvm_rcx_read(vcpu);
2019 r = kvm_get_msr_with_filter(vcpu, ecx, &data);
2022 trace_kvm_msr_read(ecx, data);
2024 kvm_rax_write(vcpu, data & -1u);
2025 kvm_rdx_write(vcpu, (data >> 32) & -1u);
2027 /* MSR read failed? See if we should ask user space */
2028 if (kvm_msr_user_space(vcpu, ecx, KVM_EXIT_X86_RDMSR, 0,
2029 complete_fast_rdmsr, r))
2031 trace_kvm_msr_read_ex(ecx);
2034 return static_call(kvm_x86_complete_emulated_msr)(vcpu, r);
2036 EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr);
2038 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
2040 u32 ecx = kvm_rcx_read(vcpu);
2041 u64 data = kvm_read_edx_eax(vcpu);
2044 r = kvm_set_msr_with_filter(vcpu, ecx, data);
2047 trace_kvm_msr_write(ecx, data);
2049 /* MSR write failed? See if we should ask user space */
2050 if (kvm_msr_user_space(vcpu, ecx, KVM_EXIT_X86_WRMSR, data,
2051 complete_fast_msr_access, r))
2053 /* Signal all other negative errors to userspace */
2056 trace_kvm_msr_write_ex(ecx, data);
2059 return static_call(kvm_x86_complete_emulated_msr)(vcpu, r);
2061 EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
2063 int kvm_emulate_as_nop(struct kvm_vcpu *vcpu)
2065 return kvm_skip_emulated_instruction(vcpu);
2068 int kvm_emulate_invd(struct kvm_vcpu *vcpu)
2070 /* Treat an INVD instruction as a NOP and just skip it. */
2071 return kvm_emulate_as_nop(vcpu);
2073 EXPORT_SYMBOL_GPL(kvm_emulate_invd);
2075 int kvm_handle_invalid_op(struct kvm_vcpu *vcpu)
2077 kvm_queue_exception(vcpu, UD_VECTOR);
2080 EXPORT_SYMBOL_GPL(kvm_handle_invalid_op);
2083 static int kvm_emulate_monitor_mwait(struct kvm_vcpu *vcpu, const char *insn)
2085 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MWAIT_NEVER_UD_FAULTS) &&
2086 !guest_cpuid_has(vcpu, X86_FEATURE_MWAIT))
2087 return kvm_handle_invalid_op(vcpu);
2089 pr_warn_once("kvm: %s instruction emulated as NOP!\n", insn);
2090 return kvm_emulate_as_nop(vcpu);
2092 int kvm_emulate_mwait(struct kvm_vcpu *vcpu)
2094 return kvm_emulate_monitor_mwait(vcpu, "MWAIT");
2096 EXPORT_SYMBOL_GPL(kvm_emulate_mwait);
2098 int kvm_emulate_monitor(struct kvm_vcpu *vcpu)
2100 return kvm_emulate_monitor_mwait(vcpu, "MONITOR");
2102 EXPORT_SYMBOL_GPL(kvm_emulate_monitor);
2104 static inline bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
2106 xfer_to_guest_mode_prepare();
2107 return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
2108 xfer_to_guest_mode_work_pending();
2112 * The fast path for frequent and performance sensitive wrmsr emulation,
2113 * i.e. the sending of IPI, sending IPI early in the VM-Exit flow reduces
2114 * the latency of virtual IPI by avoiding the expensive bits of transitioning
2115 * from guest to host, e.g. reacquiring KVM's SRCU lock. In contrast to the
2116 * other cases which must be called after interrupts are enabled on the host.
2118 static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data)
2120 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(vcpu->arch.apic))
2123 if (((data & APIC_SHORT_MASK) == APIC_DEST_NOSHORT) &&
2124 ((data & APIC_DEST_MASK) == APIC_DEST_PHYSICAL) &&
2125 ((data & APIC_MODE_MASK) == APIC_DM_FIXED) &&
2126 ((u32)(data >> 32) != X2APIC_BROADCAST))
2127 return kvm_x2apic_icr_write(vcpu->arch.apic, data);
2132 static int handle_fastpath_set_tscdeadline(struct kvm_vcpu *vcpu, u64 data)
2134 if (!kvm_can_use_hv_timer(vcpu))
2137 kvm_set_lapic_tscdeadline_msr(vcpu, data);
2141 fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu)
2143 u32 msr = kvm_rcx_read(vcpu);
2145 fastpath_t ret = EXIT_FASTPATH_NONE;
2148 case APIC_BASE_MSR + (APIC_ICR >> 4):
2149 data = kvm_read_edx_eax(vcpu);
2150 if (!handle_fastpath_set_x2apic_icr_irqoff(vcpu, data)) {
2151 kvm_skip_emulated_instruction(vcpu);
2152 ret = EXIT_FASTPATH_EXIT_HANDLED;
2155 case MSR_IA32_TSC_DEADLINE:
2156 data = kvm_read_edx_eax(vcpu);
2157 if (!handle_fastpath_set_tscdeadline(vcpu, data)) {
2158 kvm_skip_emulated_instruction(vcpu);
2159 ret = EXIT_FASTPATH_REENTER_GUEST;
2166 if (ret != EXIT_FASTPATH_NONE)
2167 trace_kvm_msr_write(msr, data);
2171 EXPORT_SYMBOL_GPL(handle_fastpath_set_msr_irqoff);
2174 * Adapt set_msr() to msr_io()'s calling convention
2176 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2178 return kvm_get_msr_ignored_check(vcpu, index, data, true);
2181 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2183 return kvm_set_msr_ignored_check(vcpu, index, *data, true);
2186 #ifdef CONFIG_X86_64
2187 struct pvclock_clock {
2197 struct pvclock_gtod_data {
2200 struct pvclock_clock clock; /* extract of a clocksource struct */
2201 struct pvclock_clock raw_clock; /* extract of a clocksource struct */
2207 static struct pvclock_gtod_data pvclock_gtod_data;
2209 static void update_pvclock_gtod(struct timekeeper *tk)
2211 struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
2213 write_seqcount_begin(&vdata->seq);
2215 /* copy pvclock gtod data */
2216 vdata->clock.vclock_mode = tk->tkr_mono.clock->vdso_clock_mode;
2217 vdata->clock.cycle_last = tk->tkr_mono.cycle_last;
2218 vdata->clock.mask = tk->tkr_mono.mask;
2219 vdata->clock.mult = tk->tkr_mono.mult;
2220 vdata->clock.shift = tk->tkr_mono.shift;
2221 vdata->clock.base_cycles = tk->tkr_mono.xtime_nsec;
2222 vdata->clock.offset = tk->tkr_mono.base;
2224 vdata->raw_clock.vclock_mode = tk->tkr_raw.clock->vdso_clock_mode;
2225 vdata->raw_clock.cycle_last = tk->tkr_raw.cycle_last;
2226 vdata->raw_clock.mask = tk->tkr_raw.mask;
2227 vdata->raw_clock.mult = tk->tkr_raw.mult;
2228 vdata->raw_clock.shift = tk->tkr_raw.shift;
2229 vdata->raw_clock.base_cycles = tk->tkr_raw.xtime_nsec;
2230 vdata->raw_clock.offset = tk->tkr_raw.base;
2232 vdata->wall_time_sec = tk->xtime_sec;
2234 vdata->offs_boot = tk->offs_boot;
2236 write_seqcount_end(&vdata->seq);
2239 static s64 get_kvmclock_base_ns(void)
2241 /* Count up from boot time, but with the frequency of the raw clock. */
2242 return ktime_to_ns(ktime_add(ktime_get_raw(), pvclock_gtod_data.offs_boot));
2245 static s64 get_kvmclock_base_ns(void)
2247 /* Master clock not used, so we can just use CLOCK_BOOTTIME. */
2248 return ktime_get_boottime_ns();
2252 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock, int sec_hi_ofs)
2256 struct pvclock_wall_clock wc;
2263 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
2268 ++version; /* first time write, random junk */
2272 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version)))
2276 * The guest calculates current wall clock time by adding
2277 * system time (updated by kvm_guest_time_update below) to the
2278 * wall clock specified here. We do the reverse here.
2280 wall_nsec = ktime_get_real_ns() - get_kvmclock_ns(kvm);
2282 wc.nsec = do_div(wall_nsec, 1000000000);
2283 wc.sec = (u32)wall_nsec; /* overflow in 2106 guest time */
2284 wc.version = version;
2286 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
2289 wc_sec_hi = wall_nsec >> 32;
2290 kvm_write_guest(kvm, wall_clock + sec_hi_ofs,
2291 &wc_sec_hi, sizeof(wc_sec_hi));
2295 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
2298 static void kvm_write_system_time(struct kvm_vcpu *vcpu, gpa_t system_time,
2299 bool old_msr, bool host_initiated)
2301 struct kvm_arch *ka = &vcpu->kvm->arch;
2303 if (vcpu->vcpu_id == 0 && !host_initiated) {
2304 if (ka->boot_vcpu_runs_old_kvmclock != old_msr)
2305 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
2307 ka->boot_vcpu_runs_old_kvmclock = old_msr;
2310 vcpu->arch.time = system_time;
2311 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
2313 /* we verify if the enable bit is set... */
2314 if (system_time & 1)
2315 kvm_gpc_activate(&vcpu->arch.pv_time, system_time & ~1ULL,
2316 sizeof(struct pvclock_vcpu_time_info));
2318 kvm_gpc_deactivate(&vcpu->arch.pv_time);
2323 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
2325 do_shl32_div32(dividend, divisor);
2329 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz,
2330 s8 *pshift, u32 *pmultiplier)
2338 scaled64 = scaled_hz;
2339 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
2344 tps32 = (uint32_t)tps64;
2345 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
2346 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
2354 *pmultiplier = div_frac(scaled64, tps32);
2357 #ifdef CONFIG_X86_64
2358 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0);
2361 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
2362 static unsigned long max_tsc_khz;
2364 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
2366 u64 v = (u64)khz * (1000000 + ppm);
2371 static void kvm_vcpu_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 l1_multiplier);
2373 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
2377 /* Guest TSC same frequency as host TSC? */
2379 kvm_vcpu_write_tsc_multiplier(vcpu, kvm_caps.default_tsc_scaling_ratio);
2383 /* TSC scaling supported? */
2384 if (!kvm_caps.has_tsc_control) {
2385 if (user_tsc_khz > tsc_khz) {
2386 vcpu->arch.tsc_catchup = 1;
2387 vcpu->arch.tsc_always_catchup = 1;
2390 pr_warn_ratelimited("user requested TSC rate below hardware speed\n");
2395 /* TSC scaling required - calculate ratio */
2396 ratio = mul_u64_u32_div(1ULL << kvm_caps.tsc_scaling_ratio_frac_bits,
2397 user_tsc_khz, tsc_khz);
2399 if (ratio == 0 || ratio >= kvm_caps.max_tsc_scaling_ratio) {
2400 pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
2405 kvm_vcpu_write_tsc_multiplier(vcpu, ratio);
2409 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
2411 u32 thresh_lo, thresh_hi;
2412 int use_scaling = 0;
2414 /* tsc_khz can be zero if TSC calibration fails */
2415 if (user_tsc_khz == 0) {
2416 /* set tsc_scaling_ratio to a safe value */
2417 kvm_vcpu_write_tsc_multiplier(vcpu, kvm_caps.default_tsc_scaling_ratio);
2421 /* Compute a scale to convert nanoseconds in TSC cycles */
2422 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC,
2423 &vcpu->arch.virtual_tsc_shift,
2424 &vcpu->arch.virtual_tsc_mult);
2425 vcpu->arch.virtual_tsc_khz = user_tsc_khz;
2428 * Compute the variation in TSC rate which is acceptable
2429 * within the range of tolerance and decide if the
2430 * rate being applied is within that bounds of the hardware
2431 * rate. If so, no scaling or compensation need be done.
2433 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
2434 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
2435 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) {
2436 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi);
2439 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling);
2442 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
2444 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
2445 vcpu->arch.virtual_tsc_mult,
2446 vcpu->arch.virtual_tsc_shift);
2447 tsc += vcpu->arch.this_tsc_write;
2451 #ifdef CONFIG_X86_64
2452 static inline int gtod_is_based_on_tsc(int mode)
2454 return mode == VDSO_CLOCKMODE_TSC || mode == VDSO_CLOCKMODE_HVCLOCK;
2458 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
2460 #ifdef CONFIG_X86_64
2462 struct kvm_arch *ka = &vcpu->kvm->arch;
2463 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2465 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
2466 atomic_read(&vcpu->kvm->online_vcpus));
2469 * Once the masterclock is enabled, always perform request in
2470 * order to update it.
2472 * In order to enable masterclock, the host clocksource must be TSC
2473 * and the vcpus need to have matched TSCs. When that happens,
2474 * perform request to enable masterclock.
2476 if (ka->use_master_clock ||
2477 (gtod_is_based_on_tsc(gtod->clock.vclock_mode) && vcpus_matched))
2478 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
2480 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc,
2481 atomic_read(&vcpu->kvm->online_vcpus),
2482 ka->use_master_clock, gtod->clock.vclock_mode);
2487 * Multiply tsc by a fixed point number represented by ratio.
2489 * The most significant 64-N bits (mult) of ratio represent the
2490 * integral part of the fixed point number; the remaining N bits
2491 * (frac) represent the fractional part, ie. ratio represents a fixed
2492 * point number (mult + frac * 2^(-N)).
2494 * N equals to kvm_caps.tsc_scaling_ratio_frac_bits.
2496 static inline u64 __scale_tsc(u64 ratio, u64 tsc)
2498 return mul_u64_u64_shr(tsc, ratio, kvm_caps.tsc_scaling_ratio_frac_bits);
2501 u64 kvm_scale_tsc(u64 tsc, u64 ratio)
2505 if (ratio != kvm_caps.default_tsc_scaling_ratio)
2506 _tsc = __scale_tsc(ratio, tsc);
2511 static u64 kvm_compute_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
2515 tsc = kvm_scale_tsc(rdtsc(), vcpu->arch.l1_tsc_scaling_ratio);
2517 return target_tsc - tsc;
2520 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
2522 return vcpu->arch.l1_tsc_offset +
2523 kvm_scale_tsc(host_tsc, vcpu->arch.l1_tsc_scaling_ratio);
2525 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc);
2527 u64 kvm_calc_nested_tsc_offset(u64 l1_offset, u64 l2_offset, u64 l2_multiplier)
2531 if (l2_multiplier == kvm_caps.default_tsc_scaling_ratio)
2532 nested_offset = l1_offset;
2534 nested_offset = mul_s64_u64_shr((s64) l1_offset, l2_multiplier,
2535 kvm_caps.tsc_scaling_ratio_frac_bits);
2537 nested_offset += l2_offset;
2538 return nested_offset;
2540 EXPORT_SYMBOL_GPL(kvm_calc_nested_tsc_offset);
2542 u64 kvm_calc_nested_tsc_multiplier(u64 l1_multiplier, u64 l2_multiplier)
2544 if (l2_multiplier != kvm_caps.default_tsc_scaling_ratio)
2545 return mul_u64_u64_shr(l1_multiplier, l2_multiplier,
2546 kvm_caps.tsc_scaling_ratio_frac_bits);
2548 return l1_multiplier;
2550 EXPORT_SYMBOL_GPL(kvm_calc_nested_tsc_multiplier);
2552 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 l1_offset)
2554 trace_kvm_write_tsc_offset(vcpu->vcpu_id,
2555 vcpu->arch.l1_tsc_offset,
2558 vcpu->arch.l1_tsc_offset = l1_offset;
2561 * If we are here because L1 chose not to trap WRMSR to TSC then
2562 * according to the spec this should set L1's TSC (as opposed to
2563 * setting L1's offset for L2).
2565 if (is_guest_mode(vcpu))
2566 vcpu->arch.tsc_offset = kvm_calc_nested_tsc_offset(
2568 static_call(kvm_x86_get_l2_tsc_offset)(vcpu),
2569 static_call(kvm_x86_get_l2_tsc_multiplier)(vcpu));
2571 vcpu->arch.tsc_offset = l1_offset;
2573 static_call(kvm_x86_write_tsc_offset)(vcpu, vcpu->arch.tsc_offset);
2576 static void kvm_vcpu_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 l1_multiplier)
2578 vcpu->arch.l1_tsc_scaling_ratio = l1_multiplier;
2580 /* Userspace is changing the multiplier while L2 is active */
2581 if (is_guest_mode(vcpu))
2582 vcpu->arch.tsc_scaling_ratio = kvm_calc_nested_tsc_multiplier(
2584 static_call(kvm_x86_get_l2_tsc_multiplier)(vcpu));
2586 vcpu->arch.tsc_scaling_ratio = l1_multiplier;
2588 if (kvm_caps.has_tsc_control)
2589 static_call(kvm_x86_write_tsc_multiplier)(
2590 vcpu, vcpu->arch.tsc_scaling_ratio);
2593 static inline bool kvm_check_tsc_unstable(void)
2595 #ifdef CONFIG_X86_64
2597 * TSC is marked unstable when we're running on Hyper-V,
2598 * 'TSC page' clocksource is good.
2600 if (pvclock_gtod_data.clock.vclock_mode == VDSO_CLOCKMODE_HVCLOCK)
2603 return check_tsc_unstable();
2607 * Infers attempts to synchronize the guest's tsc from host writes. Sets the
2608 * offset for the vcpu and tracks the TSC matching generation that the vcpu
2611 static void __kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 offset, u64 tsc,
2612 u64 ns, bool matched)
2614 struct kvm *kvm = vcpu->kvm;
2616 lockdep_assert_held(&kvm->arch.tsc_write_lock);
2619 * We also track th most recent recorded KHZ, write and time to
2620 * allow the matching interval to be extended at each write.
2622 kvm->arch.last_tsc_nsec = ns;
2623 kvm->arch.last_tsc_write = tsc;
2624 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
2625 kvm->arch.last_tsc_offset = offset;
2627 vcpu->arch.last_guest_tsc = tsc;
2629 kvm_vcpu_write_tsc_offset(vcpu, offset);
2633 * We split periods of matched TSC writes into generations.
2634 * For each generation, we track the original measured
2635 * nanosecond time, offset, and write, so if TSCs are in
2636 * sync, we can match exact offset, and if not, we can match
2637 * exact software computation in compute_guest_tsc()
2639 * These values are tracked in kvm->arch.cur_xxx variables.
2641 kvm->arch.cur_tsc_generation++;
2642 kvm->arch.cur_tsc_nsec = ns;
2643 kvm->arch.cur_tsc_write = tsc;
2644 kvm->arch.cur_tsc_offset = offset;
2645 kvm->arch.nr_vcpus_matched_tsc = 0;
2646 } else if (vcpu->arch.this_tsc_generation != kvm->arch.cur_tsc_generation) {
2647 kvm->arch.nr_vcpus_matched_tsc++;
2650 /* Keep track of which generation this VCPU has synchronized to */
2651 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
2652 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
2653 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
2655 kvm_track_tsc_matching(vcpu);
2658 static void kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 data)
2660 struct kvm *kvm = vcpu->kvm;
2661 u64 offset, ns, elapsed;
2662 unsigned long flags;
2663 bool matched = false;
2664 bool synchronizing = false;
2666 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
2667 offset = kvm_compute_l1_tsc_offset(vcpu, data);
2668 ns = get_kvmclock_base_ns();
2669 elapsed = ns - kvm->arch.last_tsc_nsec;
2671 if (vcpu->arch.virtual_tsc_khz) {
2674 * detection of vcpu initialization -- need to sync
2675 * with other vCPUs. This particularly helps to keep
2676 * kvm_clock stable after CPU hotplug
2678 synchronizing = true;
2680 u64 tsc_exp = kvm->arch.last_tsc_write +
2681 nsec_to_cycles(vcpu, elapsed);
2682 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL;
2684 * Special case: TSC write with a small delta (1 second)
2685 * of virtual cycle time against real time is
2686 * interpreted as an attempt to synchronize the CPU.
2688 synchronizing = data < tsc_exp + tsc_hz &&
2689 data + tsc_hz > tsc_exp;
2694 * For a reliable TSC, we can match TSC offsets, and for an unstable
2695 * TSC, we add elapsed time in this computation. We could let the
2696 * compensation code attempt to catch up if we fall behind, but
2697 * it's better to try to match offsets from the beginning.
2699 if (synchronizing &&
2700 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
2701 if (!kvm_check_tsc_unstable()) {
2702 offset = kvm->arch.cur_tsc_offset;
2704 u64 delta = nsec_to_cycles(vcpu, elapsed);
2706 offset = kvm_compute_l1_tsc_offset(vcpu, data);
2711 __kvm_synchronize_tsc(vcpu, offset, data, ns, matched);
2712 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
2715 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
2718 u64 tsc_offset = vcpu->arch.l1_tsc_offset;
2719 kvm_vcpu_write_tsc_offset(vcpu, tsc_offset + adjustment);
2722 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
2724 if (vcpu->arch.l1_tsc_scaling_ratio != kvm_caps.default_tsc_scaling_ratio)
2725 WARN_ON(adjustment < 0);
2726 adjustment = kvm_scale_tsc((u64) adjustment,
2727 vcpu->arch.l1_tsc_scaling_ratio);
2728 adjust_tsc_offset_guest(vcpu, adjustment);
2731 #ifdef CONFIG_X86_64
2733 static u64 read_tsc(void)
2735 u64 ret = (u64)rdtsc_ordered();
2736 u64 last = pvclock_gtod_data.clock.cycle_last;
2738 if (likely(ret >= last))
2742 * GCC likes to generate cmov here, but this branch is extremely
2743 * predictable (it's just a function of time and the likely is
2744 * very likely) and there's a data dependence, so force GCC
2745 * to generate a branch instead. I don't barrier() because
2746 * we don't actually need a barrier, and if this function
2747 * ever gets inlined it will generate worse code.
2753 static inline u64 vgettsc(struct pvclock_clock *clock, u64 *tsc_timestamp,
2759 switch (clock->vclock_mode) {
2760 case VDSO_CLOCKMODE_HVCLOCK:
2761 tsc_pg_val = hv_read_tsc_page_tsc(hv_get_tsc_page(),
2763 if (tsc_pg_val != U64_MAX) {
2764 /* TSC page valid */
2765 *mode = VDSO_CLOCKMODE_HVCLOCK;
2766 v = (tsc_pg_val - clock->cycle_last) &
2769 /* TSC page invalid */
2770 *mode = VDSO_CLOCKMODE_NONE;
2773 case VDSO_CLOCKMODE_TSC:
2774 *mode = VDSO_CLOCKMODE_TSC;
2775 *tsc_timestamp = read_tsc();
2776 v = (*tsc_timestamp - clock->cycle_last) &
2780 *mode = VDSO_CLOCKMODE_NONE;
2783 if (*mode == VDSO_CLOCKMODE_NONE)
2784 *tsc_timestamp = v = 0;
2786 return v * clock->mult;
2789 static int do_monotonic_raw(s64 *t, u64 *tsc_timestamp)
2791 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2797 seq = read_seqcount_begin(>od->seq);
2798 ns = gtod->raw_clock.base_cycles;
2799 ns += vgettsc(>od->raw_clock, tsc_timestamp, &mode);
2800 ns >>= gtod->raw_clock.shift;
2801 ns += ktime_to_ns(ktime_add(gtod->raw_clock.offset, gtod->offs_boot));
2802 } while (unlikely(read_seqcount_retry(>od->seq, seq)));
2808 static int do_realtime(struct timespec64 *ts, u64 *tsc_timestamp)
2810 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
2816 seq = read_seqcount_begin(>od->seq);
2817 ts->tv_sec = gtod->wall_time_sec;
2818 ns = gtod->clock.base_cycles;
2819 ns += vgettsc(>od->clock, tsc_timestamp, &mode);
2820 ns >>= gtod->clock.shift;
2821 } while (unlikely(read_seqcount_retry(>od->seq, seq)));
2823 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
2829 /* returns true if host is using TSC based clocksource */
2830 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp)
2832 /* checked again under seqlock below */
2833 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode))
2836 return gtod_is_based_on_tsc(do_monotonic_raw(kernel_ns,
2840 /* returns true if host is using TSC based clocksource */
2841 static bool kvm_get_walltime_and_clockread(struct timespec64 *ts,
2844 /* checked again under seqlock below */
2845 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode))
2848 return gtod_is_based_on_tsc(do_realtime(ts, tsc_timestamp));
2854 * Assuming a stable TSC across physical CPUS, and a stable TSC
2855 * across virtual CPUs, the following condition is possible.
2856 * Each numbered line represents an event visible to both
2857 * CPUs at the next numbered event.
2859 * "timespecX" represents host monotonic time. "tscX" represents
2862 * VCPU0 on CPU0 | VCPU1 on CPU1
2864 * 1. read timespec0,tsc0
2865 * 2. | timespec1 = timespec0 + N
2867 * 3. transition to guest | transition to guest
2868 * 4. ret0 = timespec0 + (rdtsc - tsc0) |
2869 * 5. | ret1 = timespec1 + (rdtsc - tsc1)
2870 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
2872 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
2875 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
2877 * - 0 < N - M => M < N
2879 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
2880 * always the case (the difference between two distinct xtime instances
2881 * might be smaller then the difference between corresponding TSC reads,
2882 * when updating guest vcpus pvclock areas).
2884 * To avoid that problem, do not allow visibility of distinct
2885 * system_timestamp/tsc_timestamp values simultaneously: use a master
2886 * copy of host monotonic time values. Update that master copy
2889 * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
2893 static void pvclock_update_vm_gtod_copy(struct kvm *kvm)
2895 #ifdef CONFIG_X86_64
2896 struct kvm_arch *ka = &kvm->arch;
2898 bool host_tsc_clocksource, vcpus_matched;
2900 lockdep_assert_held(&kvm->arch.tsc_write_lock);
2901 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
2902 atomic_read(&kvm->online_vcpus));
2905 * If the host uses TSC clock, then passthrough TSC as stable
2908 host_tsc_clocksource = kvm_get_time_and_clockread(
2909 &ka->master_kernel_ns,
2910 &ka->master_cycle_now);
2912 ka->use_master_clock = host_tsc_clocksource && vcpus_matched
2913 && !ka->backwards_tsc_observed
2914 && !ka->boot_vcpu_runs_old_kvmclock;
2916 if (ka->use_master_clock)
2917 atomic_set(&kvm_guest_has_master_clock, 1);
2919 vclock_mode = pvclock_gtod_data.clock.vclock_mode;
2920 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode,
2925 static void kvm_make_mclock_inprogress_request(struct kvm *kvm)
2927 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
2930 static void __kvm_start_pvclock_update(struct kvm *kvm)
2932 raw_spin_lock_irq(&kvm->arch.tsc_write_lock);
2933 write_seqcount_begin(&kvm->arch.pvclock_sc);
2936 static void kvm_start_pvclock_update(struct kvm *kvm)
2938 kvm_make_mclock_inprogress_request(kvm);
2940 /* no guest entries from this point */
2941 __kvm_start_pvclock_update(kvm);
2944 static void kvm_end_pvclock_update(struct kvm *kvm)
2946 struct kvm_arch *ka = &kvm->arch;
2947 struct kvm_vcpu *vcpu;
2950 write_seqcount_end(&ka->pvclock_sc);
2951 raw_spin_unlock_irq(&ka->tsc_write_lock);
2952 kvm_for_each_vcpu(i, vcpu, kvm)
2953 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2955 /* guest entries allowed */
2956 kvm_for_each_vcpu(i, vcpu, kvm)
2957 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
2960 static void kvm_update_masterclock(struct kvm *kvm)
2962 kvm_hv_request_tsc_page_update(kvm);
2963 kvm_start_pvclock_update(kvm);
2964 pvclock_update_vm_gtod_copy(kvm);
2965 kvm_end_pvclock_update(kvm);
2969 * Use the kernel's tsc_khz directly if the TSC is constant, otherwise use KVM's
2970 * per-CPU value (which may be zero if a CPU is going offline). Note, tsc_khz
2971 * can change during boot even if the TSC is constant, as it's possible for KVM
2972 * to be loaded before TSC calibration completes. Ideally, KVM would get a
2973 * notification when calibration completes, but practically speaking calibration
2974 * will complete before userspace is alive enough to create VMs.
2976 static unsigned long get_cpu_tsc_khz(void)
2978 if (static_cpu_has(X86_FEATURE_CONSTANT_TSC))
2981 return __this_cpu_read(cpu_tsc_khz);
2984 /* Called within read_seqcount_begin/retry for kvm->pvclock_sc. */
2985 static void __get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data)
2987 struct kvm_arch *ka = &kvm->arch;
2988 struct pvclock_vcpu_time_info hv_clock;
2990 /* both __this_cpu_read() and rdtsc() should be on the same cpu */
2994 if (ka->use_master_clock &&
2995 (static_cpu_has(X86_FEATURE_CONSTANT_TSC) || __this_cpu_read(cpu_tsc_khz))) {
2996 #ifdef CONFIG_X86_64
2997 struct timespec64 ts;
2999 if (kvm_get_walltime_and_clockread(&ts, &data->host_tsc)) {
3000 data->realtime = ts.tv_nsec + NSEC_PER_SEC * ts.tv_sec;
3001 data->flags |= KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC;
3004 data->host_tsc = rdtsc();
3006 data->flags |= KVM_CLOCK_TSC_STABLE;
3007 hv_clock.tsc_timestamp = ka->master_cycle_now;
3008 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
3009 kvm_get_time_scale(NSEC_PER_SEC, get_cpu_tsc_khz() * 1000LL,
3010 &hv_clock.tsc_shift,
3011 &hv_clock.tsc_to_system_mul);
3012 data->clock = __pvclock_read_cycles(&hv_clock, data->host_tsc);
3014 data->clock = get_kvmclock_base_ns() + ka->kvmclock_offset;
3020 static void get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data)
3022 struct kvm_arch *ka = &kvm->arch;
3026 seq = read_seqcount_begin(&ka->pvclock_sc);
3027 __get_kvmclock(kvm, data);
3028 } while (read_seqcount_retry(&ka->pvclock_sc, seq));
3031 u64 get_kvmclock_ns(struct kvm *kvm)
3033 struct kvm_clock_data data;
3035 get_kvmclock(kvm, &data);
3039 static void kvm_setup_guest_pvclock(struct kvm_vcpu *v,
3040 struct gfn_to_pfn_cache *gpc,
3041 unsigned int offset)
3043 struct kvm_vcpu_arch *vcpu = &v->arch;
3044 struct pvclock_vcpu_time_info *guest_hv_clock;
3045 unsigned long flags;
3047 read_lock_irqsave(&gpc->lock, flags);
3048 while (!kvm_gpc_check(gpc, offset + sizeof(*guest_hv_clock))) {
3049 read_unlock_irqrestore(&gpc->lock, flags);
3051 if (kvm_gpc_refresh(gpc, offset + sizeof(*guest_hv_clock)))
3054 read_lock_irqsave(&gpc->lock, flags);
3057 guest_hv_clock = (void *)(gpc->khva + offset);
3060 * This VCPU is paused, but it's legal for a guest to read another
3061 * VCPU's kvmclock, so we really have to follow the specification where
3062 * it says that version is odd if data is being modified, and even after
3066 guest_hv_clock->version = vcpu->hv_clock.version = (guest_hv_clock->version + 1) | 1;
3069 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
3070 vcpu->hv_clock.flags |= (guest_hv_clock->flags & PVCLOCK_GUEST_STOPPED);
3072 if (vcpu->pvclock_set_guest_stopped_request) {
3073 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED;
3074 vcpu->pvclock_set_guest_stopped_request = false;
3077 memcpy(guest_hv_clock, &vcpu->hv_clock, sizeof(*guest_hv_clock));
3080 guest_hv_clock->version = ++vcpu->hv_clock.version;
3082 mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
3083 read_unlock_irqrestore(&gpc->lock, flags);
3085 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
3088 static int kvm_guest_time_update(struct kvm_vcpu *v)
3090 unsigned long flags, tgt_tsc_khz;
3092 struct kvm_vcpu_arch *vcpu = &v->arch;
3093 struct kvm_arch *ka = &v->kvm->arch;
3095 u64 tsc_timestamp, host_tsc;
3097 bool use_master_clock;
3103 * If the host uses TSC clock, then passthrough TSC as stable
3107 seq = read_seqcount_begin(&ka->pvclock_sc);
3108 use_master_clock = ka->use_master_clock;
3109 if (use_master_clock) {
3110 host_tsc = ka->master_cycle_now;
3111 kernel_ns = ka->master_kernel_ns;
3113 } while (read_seqcount_retry(&ka->pvclock_sc, seq));
3115 /* Keep irq disabled to prevent changes to the clock */
3116 local_irq_save(flags);
3117 tgt_tsc_khz = get_cpu_tsc_khz();
3118 if (unlikely(tgt_tsc_khz == 0)) {
3119 local_irq_restore(flags);
3120 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
3123 if (!use_master_clock) {
3125 kernel_ns = get_kvmclock_base_ns();
3128 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc);
3131 * We may have to catch up the TSC to match elapsed wall clock
3132 * time for two reasons, even if kvmclock is used.
3133 * 1) CPU could have been running below the maximum TSC rate
3134 * 2) Broken TSC compensation resets the base at each VCPU
3135 * entry to avoid unknown leaps of TSC even when running
3136 * again on the same CPU. This may cause apparent elapsed
3137 * time to disappear, and the guest to stand still or run
3140 if (vcpu->tsc_catchup) {
3141 u64 tsc = compute_guest_tsc(v, kernel_ns);
3142 if (tsc > tsc_timestamp) {
3143 adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
3144 tsc_timestamp = tsc;
3148 local_irq_restore(flags);
3150 /* With all the info we got, fill in the values */
3152 if (kvm_caps.has_tsc_control)
3153 tgt_tsc_khz = kvm_scale_tsc(tgt_tsc_khz,
3154 v->arch.l1_tsc_scaling_ratio);
3156 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) {
3157 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL,
3158 &vcpu->hv_clock.tsc_shift,
3159 &vcpu->hv_clock.tsc_to_system_mul);
3160 vcpu->hw_tsc_khz = tgt_tsc_khz;
3163 vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
3164 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
3165 vcpu->last_guest_tsc = tsc_timestamp;
3167 /* If the host uses TSC clocksource, then it is stable */
3169 if (use_master_clock)
3170 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
3172 vcpu->hv_clock.flags = pvclock_flags;
3174 if (vcpu->pv_time.active)
3175 kvm_setup_guest_pvclock(v, &vcpu->pv_time, 0);
3176 if (vcpu->xen.vcpu_info_cache.active)
3177 kvm_setup_guest_pvclock(v, &vcpu->xen.vcpu_info_cache,
3178 offsetof(struct compat_vcpu_info, time));
3179 if (vcpu->xen.vcpu_time_info_cache.active)
3180 kvm_setup_guest_pvclock(v, &vcpu->xen.vcpu_time_info_cache, 0);
3181 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock);
3186 * kvmclock updates which are isolated to a given vcpu, such as
3187 * vcpu->cpu migration, should not allow system_timestamp from
3188 * the rest of the vcpus to remain static. Otherwise ntp frequency
3189 * correction applies to one vcpu's system_timestamp but not
3192 * So in those cases, request a kvmclock update for all vcpus.
3193 * We need to rate-limit these requests though, as they can
3194 * considerably slow guests that have a large number of vcpus.
3195 * The time for a remote vcpu to update its kvmclock is bound
3196 * by the delay we use to rate-limit the updates.
3199 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
3201 static void kvmclock_update_fn(struct work_struct *work)
3204 struct delayed_work *dwork = to_delayed_work(work);
3205 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
3206 kvmclock_update_work);
3207 struct kvm *kvm = container_of(ka, struct kvm, arch);
3208 struct kvm_vcpu *vcpu;
3210 kvm_for_each_vcpu(i, vcpu, kvm) {
3211 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
3212 kvm_vcpu_kick(vcpu);
3216 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
3218 struct kvm *kvm = v->kvm;
3220 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
3221 schedule_delayed_work(&kvm->arch.kvmclock_update_work,
3222 KVMCLOCK_UPDATE_DELAY);
3225 #define KVMCLOCK_SYNC_PERIOD (300 * HZ)
3227 static void kvmclock_sync_fn(struct work_struct *work)
3229 struct delayed_work *dwork = to_delayed_work(work);
3230 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
3231 kvmclock_sync_work);
3232 struct kvm *kvm = container_of(ka, struct kvm, arch);
3234 if (!kvmclock_periodic_sync)
3237 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0);
3238 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
3239 KVMCLOCK_SYNC_PERIOD);
3242 /* These helpers are safe iff @msr is known to be an MCx bank MSR. */
3243 static bool is_mci_control_msr(u32 msr)
3245 return (msr & 3) == 0;
3247 static bool is_mci_status_msr(u32 msr)
3249 return (msr & 3) == 1;
3253 * On AMD, HWCR[McStatusWrEn] controls whether setting MCi_STATUS results in #GP.
3255 static bool can_set_mci_status(struct kvm_vcpu *vcpu)
3257 /* McStatusWrEn enabled? */
3258 if (guest_cpuid_is_amd_or_hygon(vcpu))
3259 return !!(vcpu->arch.msr_hwcr & BIT_ULL(18));
3264 static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3266 u64 mcg_cap = vcpu->arch.mcg_cap;
3267 unsigned bank_num = mcg_cap & 0xff;
3268 u32 msr = msr_info->index;
3269 u64 data = msr_info->data;
3270 u32 offset, last_msr;
3273 case MSR_IA32_MCG_STATUS:
3274 vcpu->arch.mcg_status = data;
3276 case MSR_IA32_MCG_CTL:
3277 if (!(mcg_cap & MCG_CTL_P) &&
3278 (data || !msr_info->host_initiated))
3280 if (data != 0 && data != ~(u64)0)
3282 vcpu->arch.mcg_ctl = data;
3284 case MSR_IA32_MC0_CTL2 ... MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) - 1:
3285 last_msr = MSR_IA32_MCx_CTL2(bank_num) - 1;
3289 if (!(mcg_cap & MCG_CMCI_P) && (data || !msr_info->host_initiated))
3291 /* An attempt to write a 1 to a reserved bit raises #GP */
3292 if (data & ~(MCI_CTL2_CMCI_EN | MCI_CTL2_CMCI_THRESHOLD_MASK))
3294 offset = array_index_nospec(msr - MSR_IA32_MC0_CTL2,
3295 last_msr + 1 - MSR_IA32_MC0_CTL2);
3296 vcpu->arch.mci_ctl2_banks[offset] = data;
3298 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
3299 last_msr = MSR_IA32_MCx_CTL(bank_num) - 1;
3304 * Only 0 or all 1s can be written to IA32_MCi_CTL, all other
3305 * values are architecturally undefined. But, some Linux
3306 * kernels clear bit 10 in bank 4 to workaround a BIOS/GART TLB
3307 * issue on AMD K8s, allow bit 10 to be clear when setting all
3308 * other bits in order to avoid an uncaught #GP in the guest.
3310 * UNIXWARE clears bit 0 of MC1_CTL to ignore correctable,
3311 * single-bit ECC data errors.
3313 if (is_mci_control_msr(msr) &&
3314 data != 0 && (data | (1 << 10) | 1) != ~(u64)0)
3318 * All CPUs allow writing 0 to MCi_STATUS MSRs to clear the MSR.
3319 * AMD-based CPUs allow non-zero values, but if and only if
3320 * HWCR[McStatusWrEn] is set.
3322 if (!msr_info->host_initiated && is_mci_status_msr(msr) &&
3323 data != 0 && !can_set_mci_status(vcpu))
3326 offset = array_index_nospec(msr - MSR_IA32_MC0_CTL,
3327 last_msr + 1 - MSR_IA32_MC0_CTL);
3328 vcpu->arch.mce_banks[offset] = data;
3336 static inline bool kvm_pv_async_pf_enabled(struct kvm_vcpu *vcpu)
3338 u64 mask = KVM_ASYNC_PF_ENABLED | KVM_ASYNC_PF_DELIVERY_AS_INT;
3340 return (vcpu->arch.apf.msr_en_val & mask) == mask;
3343 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
3345 gpa_t gpa = data & ~0x3f;
3347 /* Bits 4:5 are reserved, Should be zero */
3351 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_VMEXIT) &&
3352 (data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT))
3355 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT) &&
3356 (data & KVM_ASYNC_PF_DELIVERY_AS_INT))
3359 if (!lapic_in_kernel(vcpu))
3360 return data ? 1 : 0;
3362 vcpu->arch.apf.msr_en_val = data;
3364 if (!kvm_pv_async_pf_enabled(vcpu)) {
3365 kvm_clear_async_pf_completion_queue(vcpu);
3366 kvm_async_pf_hash_reset(vcpu);
3370 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
3374 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
3375 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT;
3377 kvm_async_pf_wakeup_all(vcpu);
3382 static int kvm_pv_enable_async_pf_int(struct kvm_vcpu *vcpu, u64 data)
3384 /* Bits 8-63 are reserved */
3388 if (!lapic_in_kernel(vcpu))
3391 vcpu->arch.apf.msr_int_val = data;
3393 vcpu->arch.apf.vec = data & KVM_ASYNC_PF_VEC_MASK;
3398 static void kvmclock_reset(struct kvm_vcpu *vcpu)
3400 kvm_gpc_deactivate(&vcpu->arch.pv_time);
3401 vcpu->arch.time = 0;
3404 static void kvm_vcpu_flush_tlb_all(struct kvm_vcpu *vcpu)
3406 ++vcpu->stat.tlb_flush;
3407 static_call(kvm_x86_flush_tlb_all)(vcpu);
3409 /* Flushing all ASIDs flushes the current ASID... */
3410 kvm_clear_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
3413 static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu)
3415 ++vcpu->stat.tlb_flush;
3419 * A TLB flush on behalf of the guest is equivalent to
3420 * INVPCID(all), toggling CR4.PGE, etc., which requires
3421 * a forced sync of the shadow page tables. Ensure all the
3422 * roots are synced and the guest TLB in hardware is clean.
3424 kvm_mmu_sync_roots(vcpu);
3425 kvm_mmu_sync_prev_roots(vcpu);
3428 static_call(kvm_x86_flush_tlb_guest)(vcpu);
3431 * Flushing all "guest" TLB is always a superset of Hyper-V's fine
3434 kvm_hv_vcpu_purge_flush_tlb(vcpu);
3438 static inline void kvm_vcpu_flush_tlb_current(struct kvm_vcpu *vcpu)
3440 ++vcpu->stat.tlb_flush;
3441 static_call(kvm_x86_flush_tlb_current)(vcpu);
3445 * Service "local" TLB flush requests, which are specific to the current MMU
3446 * context. In addition to the generic event handling in vcpu_enter_guest(),
3447 * TLB flushes that are targeted at an MMU context also need to be serviced
3448 * prior before nested VM-Enter/VM-Exit.
3450 void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu)
3452 if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu))
3453 kvm_vcpu_flush_tlb_current(vcpu);
3455 if (kvm_check_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu))
3456 kvm_vcpu_flush_tlb_guest(vcpu);
3458 EXPORT_SYMBOL_GPL(kvm_service_local_tlb_flush_requests);
3460 static void record_steal_time(struct kvm_vcpu *vcpu)
3462 struct gfn_to_hva_cache *ghc = &vcpu->arch.st.cache;
3463 struct kvm_steal_time __user *st;
3464 struct kvm_memslots *slots;
3465 gpa_t gpa = vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS;
3469 if (kvm_xen_msr_enabled(vcpu->kvm)) {
3470 kvm_xen_runstate_set_running(vcpu);
3474 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
3477 if (WARN_ON_ONCE(current->mm != vcpu->kvm->mm))
3480 slots = kvm_memslots(vcpu->kvm);
3482 if (unlikely(slots->generation != ghc->generation ||
3484 kvm_is_error_hva(ghc->hva) || !ghc->memslot)) {
3485 /* We rely on the fact that it fits in a single page. */
3486 BUILD_BUG_ON((sizeof(*st) - 1) & KVM_STEAL_VALID_BITS);
3488 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, gpa, sizeof(*st)) ||
3489 kvm_is_error_hva(ghc->hva) || !ghc->memslot)
3493 st = (struct kvm_steal_time __user *)ghc->hva;
3495 * Doing a TLB flush here, on the guest's behalf, can avoid
3498 if (guest_pv_has(vcpu, KVM_FEATURE_PV_TLB_FLUSH)) {
3499 u8 st_preempted = 0;
3502 if (!user_access_begin(st, sizeof(*st)))
3505 asm volatile("1: xchgb %0, %2\n"
3508 _ASM_EXTABLE_UA(1b, 2b)
3509 : "+q" (st_preempted),
3511 "+m" (st->preempted));
3517 vcpu->arch.st.preempted = 0;
3519 trace_kvm_pv_tlb_flush(vcpu->vcpu_id,
3520 st_preempted & KVM_VCPU_FLUSH_TLB);
3521 if (st_preempted & KVM_VCPU_FLUSH_TLB)
3522 kvm_vcpu_flush_tlb_guest(vcpu);
3524 if (!user_access_begin(st, sizeof(*st)))
3527 if (!user_access_begin(st, sizeof(*st)))
3530 unsafe_put_user(0, &st->preempted, out);
3531 vcpu->arch.st.preempted = 0;
3534 unsafe_get_user(version, &st->version, out);
3536 version += 1; /* first time write, random junk */
3539 unsafe_put_user(version, &st->version, out);
3543 unsafe_get_user(steal, &st->steal, out);
3544 steal += current->sched_info.run_delay -
3545 vcpu->arch.st.last_steal;
3546 vcpu->arch.st.last_steal = current->sched_info.run_delay;
3547 unsafe_put_user(steal, &st->steal, out);
3550 unsafe_put_user(version, &st->version, out);
3555 mark_page_dirty_in_slot(vcpu->kvm, ghc->memslot, gpa_to_gfn(ghc->gpa));
3558 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3561 u32 msr = msr_info->index;
3562 u64 data = msr_info->data;
3564 if (msr && msr == vcpu->kvm->arch.xen_hvm_config.msr)
3565 return kvm_xen_write_hypercall_page(vcpu, data);
3568 case MSR_AMD64_NB_CFG:
3569 case MSR_IA32_UCODE_WRITE:
3570 case MSR_VM_HSAVE_PA:
3571 case MSR_AMD64_PATCH_LOADER:
3572 case MSR_AMD64_BU_CFG2:
3573 case MSR_AMD64_DC_CFG:
3574 case MSR_F15H_EX_CFG:
3577 case MSR_IA32_UCODE_REV:
3578 if (msr_info->host_initiated)
3579 vcpu->arch.microcode_version = data;
3581 case MSR_IA32_ARCH_CAPABILITIES:
3582 if (!msr_info->host_initiated)
3584 vcpu->arch.arch_capabilities = data;
3586 case MSR_IA32_PERF_CAPABILITIES:
3587 if (!msr_info->host_initiated)
3589 if (data & ~kvm_caps.supported_perf_cap)
3592 vcpu->arch.perf_capabilities = data;
3593 kvm_pmu_refresh(vcpu);
3596 return set_efer(vcpu, msr_info);
3598 data &= ~(u64)0x40; /* ignore flush filter disable */
3599 data &= ~(u64)0x100; /* ignore ignne emulation enable */
3600 data &= ~(u64)0x8; /* ignore TLB cache disable */
3602 /* Handle McStatusWrEn */
3603 if (data == BIT_ULL(18)) {
3604 vcpu->arch.msr_hwcr = data;
3605 } else if (data != 0) {
3606 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
3611 case MSR_FAM10H_MMIO_CONF_BASE:
3613 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
3618 case 0x200 ... MSR_IA32_MC0_CTL2 - 1:
3619 case MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) ... 0x2ff:
3620 return kvm_mtrr_set_msr(vcpu, msr, data);
3621 case MSR_IA32_APICBASE:
3622 return kvm_set_apic_base(vcpu, msr_info);
3623 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
3624 return kvm_x2apic_msr_write(vcpu, msr, data);
3625 case MSR_IA32_TSC_DEADLINE:
3626 kvm_set_lapic_tscdeadline_msr(vcpu, data);
3628 case MSR_IA32_TSC_ADJUST:
3629 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) {
3630 if (!msr_info->host_initiated) {
3631 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr;
3632 adjust_tsc_offset_guest(vcpu, adj);
3633 /* Before back to guest, tsc_timestamp must be adjusted
3634 * as well, otherwise guest's percpu pvclock time could jump.
3636 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
3638 vcpu->arch.ia32_tsc_adjust_msr = data;
3641 case MSR_IA32_MISC_ENABLE: {
3642 u64 old_val = vcpu->arch.ia32_misc_enable_msr;
3644 if (!msr_info->host_initiated) {
3646 if ((old_val ^ data) & MSR_IA32_MISC_ENABLE_PMU_RO_MASK)
3649 /* R bits, i.e. writes are ignored, but don't fault. */
3650 data = data & ~MSR_IA32_MISC_ENABLE_EMON;
3651 data |= old_val & MSR_IA32_MISC_ENABLE_EMON;
3654 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT) &&
3655 ((old_val ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) {
3656 if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3))
3658 vcpu->arch.ia32_misc_enable_msr = data;
3659 kvm_update_cpuid_runtime(vcpu);
3661 vcpu->arch.ia32_misc_enable_msr = data;
3665 case MSR_IA32_SMBASE:
3666 if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated)
3668 vcpu->arch.smbase = data;
3670 case MSR_IA32_POWER_CTL:
3671 vcpu->arch.msr_ia32_power_ctl = data;
3674 if (msr_info->host_initiated) {
3675 kvm_synchronize_tsc(vcpu, data);
3677 u64 adj = kvm_compute_l1_tsc_offset(vcpu, data) - vcpu->arch.l1_tsc_offset;
3678 adjust_tsc_offset_guest(vcpu, adj);
3679 vcpu->arch.ia32_tsc_adjust_msr += adj;
3683 if (!msr_info->host_initiated &&
3684 !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
3687 * KVM supports exposing PT to the guest, but does not support
3688 * IA32_XSS[bit 8]. Guests have to use RDMSR/WRMSR rather than
3689 * XSAVES/XRSTORS to save/restore PT MSRs.
3691 if (data & ~kvm_caps.supported_xss)
3693 vcpu->arch.ia32_xss = data;
3694 kvm_update_cpuid_runtime(vcpu);
3697 if (!msr_info->host_initiated)
3699 vcpu->arch.smi_count = data;
3701 case MSR_KVM_WALL_CLOCK_NEW:
3702 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3705 vcpu->kvm->arch.wall_clock = data;
3706 kvm_write_wall_clock(vcpu->kvm, data, 0);
3708 case MSR_KVM_WALL_CLOCK:
3709 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3712 vcpu->kvm->arch.wall_clock = data;
3713 kvm_write_wall_clock(vcpu->kvm, data, 0);
3715 case MSR_KVM_SYSTEM_TIME_NEW:
3716 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
3719 kvm_write_system_time(vcpu, data, false, msr_info->host_initiated);
3721 case MSR_KVM_SYSTEM_TIME:
3722 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
3725 kvm_write_system_time(vcpu, data, true, msr_info->host_initiated);
3727 case MSR_KVM_ASYNC_PF_EN:
3728 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
3731 if (kvm_pv_enable_async_pf(vcpu, data))
3734 case MSR_KVM_ASYNC_PF_INT:
3735 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
3738 if (kvm_pv_enable_async_pf_int(vcpu, data))
3741 case MSR_KVM_ASYNC_PF_ACK:
3742 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
3745 vcpu->arch.apf.pageready_pending = false;
3746 kvm_check_async_pf_completion(vcpu);
3749 case MSR_KVM_STEAL_TIME:
3750 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME))
3753 if (unlikely(!sched_info_on()))
3756 if (data & KVM_STEAL_RESERVED_MASK)
3759 vcpu->arch.st.msr_val = data;
3761 if (!(data & KVM_MSR_ENABLED))
3764 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
3767 case MSR_KVM_PV_EOI_EN:
3768 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI))
3771 if (kvm_lapic_set_pv_eoi(vcpu, data, sizeof(u8)))
3775 case MSR_KVM_POLL_CONTROL:
3776 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL))
3779 /* only enable bit supported */
3780 if (data & (-1ULL << 1))
3783 vcpu->arch.msr_kvm_poll_control = data;
3786 case MSR_IA32_MCG_CTL:
3787 case MSR_IA32_MCG_STATUS:
3788 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
3789 case MSR_IA32_MC0_CTL2 ... MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) - 1:
3790 return set_msr_mce(vcpu, msr_info);
3792 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
3793 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
3796 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
3797 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
3798 if (kvm_pmu_is_valid_msr(vcpu, msr))
3799 return kvm_pmu_set_msr(vcpu, msr_info);
3801 if (pr || data != 0)
3802 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
3803 "0x%x data 0x%llx\n", msr, data);
3805 case MSR_K7_CLK_CTL:
3807 * Ignore all writes to this no longer documented MSR.
3808 * Writes are only relevant for old K7 processors,
3809 * all pre-dating SVM, but a recommended workaround from
3810 * AMD for these chips. It is possible to specify the
3811 * affected processor models on the command line, hence
3812 * the need to ignore the workaround.
3815 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
3816 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
3817 case HV_X64_MSR_SYNDBG_OPTIONS:
3818 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
3819 case HV_X64_MSR_CRASH_CTL:
3820 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
3821 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
3822 case HV_X64_MSR_TSC_EMULATION_CONTROL:
3823 case HV_X64_MSR_TSC_EMULATION_STATUS:
3824 case HV_X64_MSR_TSC_INVARIANT_CONTROL:
3825 return kvm_hv_set_msr_common(vcpu, msr, data,
3826 msr_info->host_initiated);
3827 case MSR_IA32_BBL_CR_CTL3:
3828 /* Drop writes to this legacy MSR -- see rdmsr
3829 * counterpart for further detail.
3831 if (report_ignored_msrs)
3832 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n",
3835 case MSR_AMD64_OSVW_ID_LENGTH:
3836 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3838 vcpu->arch.osvw.length = data;
3840 case MSR_AMD64_OSVW_STATUS:
3841 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
3843 vcpu->arch.osvw.status = data;
3845 case MSR_PLATFORM_INFO:
3846 if (!msr_info->host_initiated ||
3847 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) &&
3848 cpuid_fault_enabled(vcpu)))
3850 vcpu->arch.msr_platform_info = data;
3852 case MSR_MISC_FEATURES_ENABLES:
3853 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT ||
3854 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT &&
3855 !supports_cpuid_fault(vcpu)))
3857 vcpu->arch.msr_misc_features_enables = data;
3859 #ifdef CONFIG_X86_64
3861 if (!msr_info->host_initiated &&
3862 !guest_cpuid_has(vcpu, X86_FEATURE_XFD))
3865 if (data & ~kvm_guest_supported_xfd(vcpu))
3868 fpu_update_guest_xfd(&vcpu->arch.guest_fpu, data);
3870 case MSR_IA32_XFD_ERR:
3871 if (!msr_info->host_initiated &&
3872 !guest_cpuid_has(vcpu, X86_FEATURE_XFD))
3875 if (data & ~kvm_guest_supported_xfd(vcpu))
3878 vcpu->arch.guest_fpu.xfd_err = data;
3881 case MSR_IA32_PEBS_ENABLE:
3882 case MSR_IA32_DS_AREA:
3883 case MSR_PEBS_DATA_CFG:
3884 case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5:
3885 if (kvm_pmu_is_valid_msr(vcpu, msr))
3886 return kvm_pmu_set_msr(vcpu, msr_info);
3888 * Userspace is allowed to write '0' to MSRs that KVM reports
3889 * as to-be-saved, even if an MSRs isn't fully supported.
3891 return !msr_info->host_initiated || data;
3893 if (kvm_pmu_is_valid_msr(vcpu, msr))
3894 return kvm_pmu_set_msr(vcpu, msr_info);
3895 return KVM_MSR_RET_INVALID;
3899 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
3901 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
3904 u64 mcg_cap = vcpu->arch.mcg_cap;
3905 unsigned bank_num = mcg_cap & 0xff;
3906 u32 offset, last_msr;
3909 case MSR_IA32_P5_MC_ADDR:
3910 case MSR_IA32_P5_MC_TYPE:
3913 case MSR_IA32_MCG_CAP:
3914 data = vcpu->arch.mcg_cap;
3916 case MSR_IA32_MCG_CTL:
3917 if (!(mcg_cap & MCG_CTL_P) && !host)
3919 data = vcpu->arch.mcg_ctl;
3921 case MSR_IA32_MCG_STATUS:
3922 data = vcpu->arch.mcg_status;
3924 case MSR_IA32_MC0_CTL2 ... MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) - 1:
3925 last_msr = MSR_IA32_MCx_CTL2(bank_num) - 1;
3929 if (!(mcg_cap & MCG_CMCI_P) && !host)
3931 offset = array_index_nospec(msr - MSR_IA32_MC0_CTL2,
3932 last_msr + 1 - MSR_IA32_MC0_CTL2);
3933 data = vcpu->arch.mci_ctl2_banks[offset];
3935 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
3936 last_msr = MSR_IA32_MCx_CTL(bank_num) - 1;
3940 offset = array_index_nospec(msr - MSR_IA32_MC0_CTL,
3941 last_msr + 1 - MSR_IA32_MC0_CTL);
3942 data = vcpu->arch.mce_banks[offset];
3951 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3953 switch (msr_info->index) {
3954 case MSR_IA32_PLATFORM_ID:
3955 case MSR_IA32_EBL_CR_POWERON:
3956 case MSR_IA32_LASTBRANCHFROMIP:
3957 case MSR_IA32_LASTBRANCHTOIP:
3958 case MSR_IA32_LASTINTFROMIP:
3959 case MSR_IA32_LASTINTTOIP:
3960 case MSR_AMD64_SYSCFG:
3961 case MSR_K8_TSEG_ADDR:
3962 case MSR_K8_TSEG_MASK:
3963 case MSR_VM_HSAVE_PA:
3964 case MSR_K8_INT_PENDING_MSG:
3965 case MSR_AMD64_NB_CFG:
3966 case MSR_FAM10H_MMIO_CONF_BASE:
3967 case MSR_AMD64_BU_CFG2:
3968 case MSR_IA32_PERF_CTL:
3969 case MSR_AMD64_DC_CFG:
3970 case MSR_F15H_EX_CFG:
3972 * Intel Sandy Bridge CPUs must support the RAPL (running average power
3973 * limit) MSRs. Just return 0, as we do not want to expose the host
3974 * data here. Do not conditionalize this on CPUID, as KVM does not do
3975 * so for existing CPU-specific MSRs.
3977 case MSR_RAPL_POWER_UNIT:
3978 case MSR_PP0_ENERGY_STATUS: /* Power plane 0 (core) */
3979 case MSR_PP1_ENERGY_STATUS: /* Power plane 1 (graphics uncore) */
3980 case MSR_PKG_ENERGY_STATUS: /* Total package */
3981 case MSR_DRAM_ENERGY_STATUS: /* DRAM controller */
3984 case MSR_IA32_PEBS_ENABLE:
3985 case MSR_IA32_DS_AREA:
3986 case MSR_PEBS_DATA_CFG:
3987 case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5:
3988 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
3989 return kvm_pmu_get_msr(vcpu, msr_info);
3991 * Userspace is allowed to read MSRs that KVM reports as
3992 * to-be-saved, even if an MSR isn't fully supported.
3994 if (!msr_info->host_initiated)
3998 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
3999 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
4000 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
4001 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
4002 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
4003 return kvm_pmu_get_msr(vcpu, msr_info);
4006 case MSR_IA32_UCODE_REV:
4007 msr_info->data = vcpu->arch.microcode_version;
4009 case MSR_IA32_ARCH_CAPABILITIES:
4010 if (!msr_info->host_initiated &&
4011 !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES))
4013 msr_info->data = vcpu->arch.arch_capabilities;
4015 case MSR_IA32_PERF_CAPABILITIES:
4016 if (!msr_info->host_initiated &&
4017 !guest_cpuid_has(vcpu, X86_FEATURE_PDCM))
4019 msr_info->data = vcpu->arch.perf_capabilities;
4021 case MSR_IA32_POWER_CTL:
4022 msr_info->data = vcpu->arch.msr_ia32_power_ctl;
4024 case MSR_IA32_TSC: {
4026 * Intel SDM states that MSR_IA32_TSC read adds the TSC offset
4027 * even when not intercepted. AMD manual doesn't explicitly
4028 * state this but appears to behave the same.
4030 * On userspace reads and writes, however, we unconditionally
4031 * return L1's TSC value to ensure backwards-compatible
4032 * behavior for migration.
4036 if (msr_info->host_initiated) {
4037 offset = vcpu->arch.l1_tsc_offset;
4038 ratio = vcpu->arch.l1_tsc_scaling_ratio;
4040 offset = vcpu->arch.tsc_offset;
4041 ratio = vcpu->arch.tsc_scaling_ratio;
4044 msr_info->data = kvm_scale_tsc(rdtsc(), ratio) + offset;
4048 case 0x200 ... MSR_IA32_MC0_CTL2 - 1:
4049 case MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) ... 0x2ff:
4050 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data);
4051 case 0xcd: /* fsb frequency */
4055 * MSR_EBC_FREQUENCY_ID
4056 * Conservative value valid for even the basic CPU models.
4057 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
4058 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
4059 * and 266MHz for model 3, or 4. Set Core Clock
4060 * Frequency to System Bus Frequency Ratio to 1 (bits
4061 * 31:24) even though these are only valid for CPU
4062 * models > 2, however guests may end up dividing or
4063 * multiplying by zero otherwise.
4065 case MSR_EBC_FREQUENCY_ID:
4066 msr_info->data = 1 << 24;
4068 case MSR_IA32_APICBASE:
4069 msr_info->data = kvm_get_apic_base(vcpu);
4071 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
4072 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
4073 case MSR_IA32_TSC_DEADLINE:
4074 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
4076 case MSR_IA32_TSC_ADJUST:
4077 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
4079 case MSR_IA32_MISC_ENABLE:
4080 msr_info->data = vcpu->arch.ia32_misc_enable_msr;
4082 case MSR_IA32_SMBASE:
4083 if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated)
4085 msr_info->data = vcpu->arch.smbase;
4088 msr_info->data = vcpu->arch.smi_count;
4090 case MSR_IA32_PERF_STATUS:
4091 /* TSC increment by tick */
4092 msr_info->data = 1000ULL;
4093 /* CPU multiplier */
4094 msr_info->data |= (((uint64_t)4ULL) << 40);
4097 msr_info->data = vcpu->arch.efer;
4099 case MSR_KVM_WALL_CLOCK:
4100 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
4103 msr_info->data = vcpu->kvm->arch.wall_clock;
4105 case MSR_KVM_WALL_CLOCK_NEW:
4106 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
4109 msr_info->data = vcpu->kvm->arch.wall_clock;
4111 case MSR_KVM_SYSTEM_TIME:
4112 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE))
4115 msr_info->data = vcpu->arch.time;
4117 case MSR_KVM_SYSTEM_TIME_NEW:
4118 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2))
4121 msr_info->data = vcpu->arch.time;
4123 case MSR_KVM_ASYNC_PF_EN:
4124 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
4127 msr_info->data = vcpu->arch.apf.msr_en_val;
4129 case MSR_KVM_ASYNC_PF_INT:
4130 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
4133 msr_info->data = vcpu->arch.apf.msr_int_val;
4135 case MSR_KVM_ASYNC_PF_ACK:
4136 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
4141 case MSR_KVM_STEAL_TIME:
4142 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME))
4145 msr_info->data = vcpu->arch.st.msr_val;
4147 case MSR_KVM_PV_EOI_EN:
4148 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI))
4151 msr_info->data = vcpu->arch.pv_eoi.msr_val;
4153 case MSR_KVM_POLL_CONTROL:
4154 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL))
4157 msr_info->data = vcpu->arch.msr_kvm_poll_control;
4159 case MSR_IA32_P5_MC_ADDR:
4160 case MSR_IA32_P5_MC_TYPE:
4161 case MSR_IA32_MCG_CAP:
4162 case MSR_IA32_MCG_CTL:
4163 case MSR_IA32_MCG_STATUS:
4164 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
4165 case MSR_IA32_MC0_CTL2 ... MSR_IA32_MCx_CTL2(KVM_MAX_MCE_BANKS) - 1:
4166 return get_msr_mce(vcpu, msr_info->index, &msr_info->data,
4167 msr_info->host_initiated);
4169 if (!msr_info->host_initiated &&
4170 !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
4172 msr_info->data = vcpu->arch.ia32_xss;
4174 case MSR_K7_CLK_CTL:
4176 * Provide expected ramp-up count for K7. All other
4177 * are set to zero, indicating minimum divisors for
4180 * This prevents guest kernels on AMD host with CPU
4181 * type 6, model 8 and higher from exploding due to
4182 * the rdmsr failing.
4184 msr_info->data = 0x20000000;
4186 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
4187 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
4188 case HV_X64_MSR_SYNDBG_OPTIONS:
4189 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
4190 case HV_X64_MSR_CRASH_CTL:
4191 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
4192 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
4193 case HV_X64_MSR_TSC_EMULATION_CONTROL:
4194 case HV_X64_MSR_TSC_EMULATION_STATUS:
4195 case HV_X64_MSR_TSC_INVARIANT_CONTROL:
4196 return kvm_hv_get_msr_common(vcpu,
4197 msr_info->index, &msr_info->data,
4198 msr_info->host_initiated);
4199 case MSR_IA32_BBL_CR_CTL3:
4200 /* This legacy MSR exists but isn't fully documented in current
4201 * silicon. It is however accessed by winxp in very narrow
4202 * scenarios where it sets bit #19, itself documented as
4203 * a "reserved" bit. Best effort attempt to source coherent
4204 * read data here should the balance of the register be
4205 * interpreted by the guest:
4207 * L2 cache control register 3: 64GB range, 256KB size,
4208 * enabled, latency 0x1, configured
4210 msr_info->data = 0xbe702111;
4212 case MSR_AMD64_OSVW_ID_LENGTH:
4213 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
4215 msr_info->data = vcpu->arch.osvw.length;
4217 case MSR_AMD64_OSVW_STATUS:
4218 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
4220 msr_info->data = vcpu->arch.osvw.status;
4222 case MSR_PLATFORM_INFO:
4223 if (!msr_info->host_initiated &&
4224 !vcpu->kvm->arch.guest_can_read_msr_platform_info)
4226 msr_info->data = vcpu->arch.msr_platform_info;
4228 case MSR_MISC_FEATURES_ENABLES:
4229 msr_info->data = vcpu->arch.msr_misc_features_enables;
4232 msr_info->data = vcpu->arch.msr_hwcr;
4234 #ifdef CONFIG_X86_64
4236 if (!msr_info->host_initiated &&
4237 !guest_cpuid_has(vcpu, X86_FEATURE_XFD))
4240 msr_info->data = vcpu->arch.guest_fpu.fpstate->xfd;
4242 case MSR_IA32_XFD_ERR:
4243 if (!msr_info->host_initiated &&
4244 !guest_cpuid_has(vcpu, X86_FEATURE_XFD))
4247 msr_info->data = vcpu->arch.guest_fpu.xfd_err;
4251 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
4252 return kvm_pmu_get_msr(vcpu, msr_info);
4253 return KVM_MSR_RET_INVALID;
4257 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
4260 * Read or write a bunch of msrs. All parameters are kernel addresses.
4262 * @return number of msrs set successfully.
4264 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
4265 struct kvm_msr_entry *entries,
4266 int (*do_msr)(struct kvm_vcpu *vcpu,
4267 unsigned index, u64 *data))
4271 for (i = 0; i < msrs->nmsrs; ++i)
4272 if (do_msr(vcpu, entries[i].index, &entries[i].data))
4279 * Read or write a bunch of msrs. Parameters are user addresses.
4281 * @return number of msrs set successfully.
4283 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
4284 int (*do_msr)(struct kvm_vcpu *vcpu,
4285 unsigned index, u64 *data),
4288 struct kvm_msrs msrs;
4289 struct kvm_msr_entry *entries;
4294 if (copy_from_user(&msrs, user_msrs, sizeof(msrs)))
4298 if (msrs.nmsrs >= MAX_IO_MSRS)
4301 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
4302 entries = memdup_user(user_msrs->entries, size);
4303 if (IS_ERR(entries)) {
4304 r = PTR_ERR(entries);
4308 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
4313 if (writeback && copy_to_user(user_msrs->entries, entries, size))
4324 static inline bool kvm_can_mwait_in_guest(void)
4326 return boot_cpu_has(X86_FEATURE_MWAIT) &&
4327 !boot_cpu_has_bug(X86_BUG_MONITOR) &&
4328 boot_cpu_has(X86_FEATURE_ARAT);
4331 static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
4332 struct kvm_cpuid2 __user *cpuid_arg)
4334 struct kvm_cpuid2 cpuid;
4338 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
4341 r = kvm_get_hv_cpuid(vcpu, &cpuid, cpuid_arg->entries);
4346 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
4352 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
4357 case KVM_CAP_IRQCHIP:
4359 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
4360 case KVM_CAP_SET_TSS_ADDR:
4361 case KVM_CAP_EXT_CPUID:
4362 case KVM_CAP_EXT_EMUL_CPUID:
4363 case KVM_CAP_CLOCKSOURCE:
4365 case KVM_CAP_NOP_IO_DELAY:
4366 case KVM_CAP_MP_STATE:
4367 case KVM_CAP_SYNC_MMU:
4368 case KVM_CAP_USER_NMI:
4369 case KVM_CAP_REINJECT_CONTROL:
4370 case KVM_CAP_IRQ_INJECT_STATUS:
4371 case KVM_CAP_IOEVENTFD:
4372 case KVM_CAP_IOEVENTFD_NO_LENGTH:
4374 case KVM_CAP_PIT_STATE2:
4375 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
4376 case KVM_CAP_VCPU_EVENTS:
4377 case KVM_CAP_HYPERV:
4378 case KVM_CAP_HYPERV_VAPIC:
4379 case KVM_CAP_HYPERV_SPIN:
4380 case KVM_CAP_HYPERV_SYNIC:
4381 case KVM_CAP_HYPERV_SYNIC2:
4382 case KVM_CAP_HYPERV_VP_INDEX:
4383 case KVM_CAP_HYPERV_EVENTFD:
4384 case KVM_CAP_HYPERV_TLBFLUSH:
4385 case KVM_CAP_HYPERV_SEND_IPI:
4386 case KVM_CAP_HYPERV_CPUID:
4387 case KVM_CAP_HYPERV_ENFORCE_CPUID:
4388 case KVM_CAP_SYS_HYPERV_CPUID:
4389 case KVM_CAP_PCI_SEGMENT:
4390 case KVM_CAP_DEBUGREGS:
4391 case KVM_CAP_X86_ROBUST_SINGLESTEP:
4393 case KVM_CAP_ASYNC_PF:
4394 case KVM_CAP_ASYNC_PF_INT:
4395 case KVM_CAP_GET_TSC_KHZ:
4396 case KVM_CAP_KVMCLOCK_CTRL:
4397 case KVM_CAP_READONLY_MEM:
4398 case KVM_CAP_HYPERV_TIME:
4399 case KVM_CAP_IOAPIC_POLARITY_IGNORED:
4400 case KVM_CAP_TSC_DEADLINE_TIMER:
4401 case KVM_CAP_DISABLE_QUIRKS:
4402 case KVM_CAP_SET_BOOT_CPU_ID:
4403 case KVM_CAP_SPLIT_IRQCHIP:
4404 case KVM_CAP_IMMEDIATE_EXIT:
4405 case KVM_CAP_PMU_EVENT_FILTER:
4406 case KVM_CAP_GET_MSR_FEATURES:
4407 case KVM_CAP_MSR_PLATFORM_INFO:
4408 case KVM_CAP_EXCEPTION_PAYLOAD:
4409 case KVM_CAP_X86_TRIPLE_FAULT_EVENT:
4410 case KVM_CAP_SET_GUEST_DEBUG:
4411 case KVM_CAP_LAST_CPU:
4412 case KVM_CAP_X86_USER_SPACE_MSR:
4413 case KVM_CAP_X86_MSR_FILTER:
4414 case KVM_CAP_ENFORCE_PV_FEATURE_CPUID:
4415 #ifdef CONFIG_X86_SGX_KVM
4416 case KVM_CAP_SGX_ATTRIBUTE:
4418 case KVM_CAP_VM_COPY_ENC_CONTEXT_FROM:
4419 case KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM:
4420 case KVM_CAP_SREGS2:
4421 case KVM_CAP_EXIT_ON_EMULATION_FAILURE:
4422 case KVM_CAP_VCPU_ATTRIBUTES:
4423 case KVM_CAP_SYS_ATTRIBUTES:
4425 case KVM_CAP_ENABLE_CAP:
4426 case KVM_CAP_VM_DISABLE_NX_HUGE_PAGES:
4429 case KVM_CAP_EXIT_HYPERCALL:
4430 r = KVM_EXIT_HYPERCALL_VALID_MASK;
4432 case KVM_CAP_SET_GUEST_DEBUG2:
4433 return KVM_GUESTDBG_VALID_MASK;
4434 #ifdef CONFIG_KVM_XEN
4435 case KVM_CAP_XEN_HVM:
4436 r = KVM_XEN_HVM_CONFIG_HYPERCALL_MSR |
4437 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL |
4438 KVM_XEN_HVM_CONFIG_SHARED_INFO |
4439 KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL |
4440 KVM_XEN_HVM_CONFIG_EVTCHN_SEND;
4441 if (sched_info_on())
4442 r |= KVM_XEN_HVM_CONFIG_RUNSTATE |
4443 KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG;
4446 case KVM_CAP_SYNC_REGS:
4447 r = KVM_SYNC_X86_VALID_FIELDS;
4449 case KVM_CAP_ADJUST_CLOCK:
4450 r = KVM_CLOCK_VALID_FLAGS;
4452 case KVM_CAP_X86_DISABLE_EXITS:
4453 r |= KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE |
4454 KVM_X86_DISABLE_EXITS_CSTATE;
4455 if(kvm_can_mwait_in_guest())
4456 r |= KVM_X86_DISABLE_EXITS_MWAIT;
4458 case KVM_CAP_X86_SMM:
4459 if (!IS_ENABLED(CONFIG_KVM_SMM))
4462 /* SMBASE is usually relocated above 1M on modern chipsets,
4463 * and SMM handlers might indeed rely on 4G segment limits,
4464 * so do not report SMM to be available if real mode is
4465 * emulated via vm86 mode. Still, do not go to great lengths
4466 * to avoid userspace's usage of the feature, because it is a
4467 * fringe case that is not enabled except via specific settings
4468 * of the module parameters.
4470 r = static_call(kvm_x86_has_emulated_msr)(kvm, MSR_IA32_SMBASE);
4472 case KVM_CAP_NR_VCPUS:
4473 r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS);
4475 case KVM_CAP_MAX_VCPUS:
4478 case KVM_CAP_MAX_VCPU_ID:
4479 r = KVM_MAX_VCPU_IDS;
4481 case KVM_CAP_PV_MMU: /* obsolete */
4485 r = KVM_MAX_MCE_BANKS;
4488 r = boot_cpu_has(X86_FEATURE_XSAVE);
4490 case KVM_CAP_TSC_CONTROL:
4491 case KVM_CAP_VM_TSC_CONTROL:
4492 r = kvm_caps.has_tsc_control;
4494 case KVM_CAP_X2APIC_API:
4495 r = KVM_X2APIC_API_VALID_FLAGS;
4497 case KVM_CAP_NESTED_STATE:
4498 r = kvm_x86_ops.nested_ops->get_state ?
4499 kvm_x86_ops.nested_ops->get_state(NULL, NULL, 0) : 0;
4501 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
4502 r = kvm_x86_ops.enable_l2_tlb_flush != NULL;
4504 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
4505 r = kvm_x86_ops.nested_ops->enable_evmcs != NULL;
4507 case KVM_CAP_SMALLER_MAXPHYADDR:
4508 r = (int) allow_smaller_maxphyaddr;
4510 case KVM_CAP_STEAL_TIME:
4511 r = sched_info_on();
4513 case KVM_CAP_X86_BUS_LOCK_EXIT:
4514 if (kvm_caps.has_bus_lock_exit)
4515 r = KVM_BUS_LOCK_DETECTION_OFF |
4516 KVM_BUS_LOCK_DETECTION_EXIT;
4520 case KVM_CAP_XSAVE2: {
4521 u64 guest_perm = xstate_get_guest_group_perm();
4523 r = xstate_required_size(kvm_caps.supported_xcr0 & guest_perm, false);
4524 if (r < sizeof(struct kvm_xsave))
4525 r = sizeof(struct kvm_xsave);
4528 case KVM_CAP_PMU_CAPABILITY:
4529 r = enable_pmu ? KVM_CAP_PMU_VALID_MASK : 0;
4531 case KVM_CAP_DISABLE_QUIRKS2:
4532 r = KVM_X86_VALID_QUIRKS;
4534 case KVM_CAP_X86_NOTIFY_VMEXIT:
4535 r = kvm_caps.has_notify_vmexit;
4543 static inline void __user *kvm_get_attr_addr(struct kvm_device_attr *attr)
4545 void __user *uaddr = (void __user*)(unsigned long)attr->addr;
4547 if ((u64)(unsigned long)uaddr != attr->addr)
4548 return ERR_PTR_USR(-EFAULT);
4552 static int kvm_x86_dev_get_attr(struct kvm_device_attr *attr)
4554 u64 __user *uaddr = kvm_get_attr_addr(attr);
4560 return PTR_ERR(uaddr);
4562 switch (attr->attr) {
4563 case KVM_X86_XCOMP_GUEST_SUPP:
4564 if (put_user(kvm_caps.supported_xcr0, uaddr))
4573 static int kvm_x86_dev_has_attr(struct kvm_device_attr *attr)
4578 switch (attr->attr) {
4579 case KVM_X86_XCOMP_GUEST_SUPP:
4586 long kvm_arch_dev_ioctl(struct file *filp,
4587 unsigned int ioctl, unsigned long arg)
4589 void __user *argp = (void __user *)arg;
4593 case KVM_GET_MSR_INDEX_LIST: {
4594 struct kvm_msr_list __user *user_msr_list = argp;
4595 struct kvm_msr_list msr_list;
4599 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
4602 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs;
4603 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
4606 if (n < msr_list.nmsrs)
4609 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
4610 num_msrs_to_save * sizeof(u32)))
4612 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
4614 num_emulated_msrs * sizeof(u32)))
4619 case KVM_GET_SUPPORTED_CPUID:
4620 case KVM_GET_EMULATED_CPUID: {
4621 struct kvm_cpuid2 __user *cpuid_arg = argp;
4622 struct kvm_cpuid2 cpuid;
4625 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
4628 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries,
4634 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
4639 case KVM_X86_GET_MCE_CAP_SUPPORTED:
4641 if (copy_to_user(argp, &kvm_caps.supported_mce_cap,
4642 sizeof(kvm_caps.supported_mce_cap)))
4646 case KVM_GET_MSR_FEATURE_INDEX_LIST: {
4647 struct kvm_msr_list __user *user_msr_list = argp;
4648 struct kvm_msr_list msr_list;
4652 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
4655 msr_list.nmsrs = num_msr_based_features;
4656 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
4659 if (n < msr_list.nmsrs)
4662 if (copy_to_user(user_msr_list->indices, &msr_based_features,
4663 num_msr_based_features * sizeof(u32)))
4669 r = msr_io(NULL, argp, do_get_msr_feature, 1);
4671 case KVM_GET_SUPPORTED_HV_CPUID:
4672 r = kvm_ioctl_get_supported_hv_cpuid(NULL, argp);
4674 case KVM_GET_DEVICE_ATTR: {
4675 struct kvm_device_attr attr;
4677 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
4679 r = kvm_x86_dev_get_attr(&attr);
4682 case KVM_HAS_DEVICE_ATTR: {
4683 struct kvm_device_attr attr;
4685 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
4687 r = kvm_x86_dev_has_attr(&attr);
4698 static void wbinvd_ipi(void *garbage)
4703 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
4705 return kvm_arch_has_noncoherent_dma(vcpu->kvm);
4708 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
4710 /* Address WBINVD may be executed by guest */
4711 if (need_emulate_wbinvd(vcpu)) {
4712 if (static_call(kvm_x86_has_wbinvd_exit)())
4713 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4714 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
4715 smp_call_function_single(vcpu->cpu,
4716 wbinvd_ipi, NULL, 1);
4719 static_call(kvm_x86_vcpu_load)(vcpu, cpu);
4721 /* Save host pkru register if supported */
4722 vcpu->arch.host_pkru = read_pkru();
4724 /* Apply any externally detected TSC adjustments (due to suspend) */
4725 if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
4726 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
4727 vcpu->arch.tsc_offset_adjustment = 0;
4728 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4731 if (unlikely(vcpu->cpu != cpu) || kvm_check_tsc_unstable()) {
4732 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
4733 rdtsc() - vcpu->arch.last_host_tsc;
4735 mark_tsc_unstable("KVM discovered backwards TSC");
4737 if (kvm_check_tsc_unstable()) {
4738 u64 offset = kvm_compute_l1_tsc_offset(vcpu,
4739 vcpu->arch.last_guest_tsc);
4740 kvm_vcpu_write_tsc_offset(vcpu, offset);
4741 vcpu->arch.tsc_catchup = 1;
4744 if (kvm_lapic_hv_timer_in_use(vcpu))
4745 kvm_lapic_restart_hv_timer(vcpu);
4748 * On a host with synchronized TSC, there is no need to update
4749 * kvmclock on vcpu->cpu migration
4751 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1)
4752 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
4753 if (vcpu->cpu != cpu)
4754 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu);
4758 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
4761 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
4763 struct gfn_to_hva_cache *ghc = &vcpu->arch.st.cache;
4764 struct kvm_steal_time __user *st;
4765 struct kvm_memslots *slots;
4766 static const u8 preempted = KVM_VCPU_PREEMPTED;
4767 gpa_t gpa = vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS;
4770 * The vCPU can be marked preempted if and only if the VM-Exit was on
4771 * an instruction boundary and will not trigger guest emulation of any
4772 * kind (see vcpu_run). Vendor specific code controls (conservatively)
4773 * when this is true, for example allowing the vCPU to be marked
4774 * preempted if and only if the VM-Exit was due to a host interrupt.
4776 if (!vcpu->arch.at_instruction_boundary) {
4777 vcpu->stat.preemption_other++;
4781 vcpu->stat.preemption_reported++;
4782 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
4785 if (vcpu->arch.st.preempted)
4788 /* This happens on process exit */
4789 if (unlikely(current->mm != vcpu->kvm->mm))
4792 slots = kvm_memslots(vcpu->kvm);
4794 if (unlikely(slots->generation != ghc->generation ||
4796 kvm_is_error_hva(ghc->hva) || !ghc->memslot))
4799 st = (struct kvm_steal_time __user *)ghc->hva;
4800 BUILD_BUG_ON(sizeof(st->preempted) != sizeof(preempted));
4802 if (!copy_to_user_nofault(&st->preempted, &preempted, sizeof(preempted)))
4803 vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
4805 mark_page_dirty_in_slot(vcpu->kvm, ghc->memslot, gpa_to_gfn(ghc->gpa));
4808 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
4812 if (vcpu->preempted) {
4813 if (!vcpu->arch.guest_state_protected)
4814 vcpu->arch.preempted_in_kernel = !static_call(kvm_x86_get_cpl)(vcpu);
4817 * Take the srcu lock as memslots will be accessed to check the gfn
4818 * cache generation against the memslots generation.
4820 idx = srcu_read_lock(&vcpu->kvm->srcu);
4821 if (kvm_xen_msr_enabled(vcpu->kvm))
4822 kvm_xen_runstate_set_preempted(vcpu);
4824 kvm_steal_time_set_preempted(vcpu);
4825 srcu_read_unlock(&vcpu->kvm->srcu, idx);
4828 static_call(kvm_x86_vcpu_put)(vcpu);
4829 vcpu->arch.last_host_tsc = rdtsc();
4832 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
4833 struct kvm_lapic_state *s)
4835 static_call_cond(kvm_x86_sync_pir_to_irr)(vcpu);
4837 return kvm_apic_get_state(vcpu, s);
4840 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
4841 struct kvm_lapic_state *s)
4845 r = kvm_apic_set_state(vcpu, s);
4848 update_cr8_intercept(vcpu);
4853 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu)
4856 * We can accept userspace's request for interrupt injection
4857 * as long as we have a place to store the interrupt number.
4858 * The actual injection will happen when the CPU is able to
4859 * deliver the interrupt.
4861 if (kvm_cpu_has_extint(vcpu))
4864 /* Acknowledging ExtINT does not happen if LINT0 is masked. */
4865 return (!lapic_in_kernel(vcpu) ||
4866 kvm_apic_accept_pic_intr(vcpu));
4869 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu)
4872 * Do not cause an interrupt window exit if an exception
4873 * is pending or an event needs reinjection; userspace
4874 * might want to inject the interrupt manually using KVM_SET_REGS
4875 * or KVM_SET_SREGS. For that to work, we must be at an
4876 * instruction boundary and with no events half-injected.
4878 return (kvm_arch_interrupt_allowed(vcpu) &&
4879 kvm_cpu_accept_dm_intr(vcpu) &&
4880 !kvm_event_needs_reinjection(vcpu) &&
4881 !kvm_is_exception_pending(vcpu));
4884 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
4885 struct kvm_interrupt *irq)
4887 if (irq->irq >= KVM_NR_INTERRUPTS)
4890 if (!irqchip_in_kernel(vcpu->kvm)) {
4891 kvm_queue_interrupt(vcpu, irq->irq, false);
4892 kvm_make_request(KVM_REQ_EVENT, vcpu);
4897 * With in-kernel LAPIC, we only use this to inject EXTINT, so
4898 * fail for in-kernel 8259.
4900 if (pic_in_kernel(vcpu->kvm))
4903 if (vcpu->arch.pending_external_vector != -1)
4906 vcpu->arch.pending_external_vector = irq->irq;
4907 kvm_make_request(KVM_REQ_EVENT, vcpu);
4911 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
4913 kvm_inject_nmi(vcpu);
4918 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
4919 struct kvm_tpr_access_ctl *tac)
4923 vcpu->arch.tpr_access_reporting = !!tac->enabled;
4927 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
4931 unsigned bank_num = mcg_cap & 0xff, bank;
4934 if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
4936 if (mcg_cap & ~(kvm_caps.supported_mce_cap | 0xff | 0xff0000))
4939 vcpu->arch.mcg_cap = mcg_cap;
4940 /* Init IA32_MCG_CTL to all 1s */
4941 if (mcg_cap & MCG_CTL_P)
4942 vcpu->arch.mcg_ctl = ~(u64)0;
4943 /* Init IA32_MCi_CTL to all 1s, IA32_MCi_CTL2 to all 0s */
4944 for (bank = 0; bank < bank_num; bank++) {
4945 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
4946 if (mcg_cap & MCG_CMCI_P)
4947 vcpu->arch.mci_ctl2_banks[bank] = 0;
4950 kvm_apic_after_set_mcg_cap(vcpu);
4952 static_call(kvm_x86_setup_mce)(vcpu);
4958 * Validate this is an UCNA (uncorrectable no action) error by checking the
4959 * MCG_STATUS and MCi_STATUS registers:
4960 * - none of the bits for Machine Check Exceptions are set
4961 * - both the VAL (valid) and UC (uncorrectable) bits are set
4962 * MCI_STATUS_PCC - Processor Context Corrupted
4963 * MCI_STATUS_S - Signaled as a Machine Check Exception
4964 * MCI_STATUS_AR - Software recoverable Action Required
4966 static bool is_ucna(struct kvm_x86_mce *mce)
4968 return !mce->mcg_status &&
4969 !(mce->status & (MCI_STATUS_PCC | MCI_STATUS_S | MCI_STATUS_AR)) &&
4970 (mce->status & MCI_STATUS_VAL) &&
4971 (mce->status & MCI_STATUS_UC);
4974 static int kvm_vcpu_x86_set_ucna(struct kvm_vcpu *vcpu, struct kvm_x86_mce *mce, u64* banks)
4976 u64 mcg_cap = vcpu->arch.mcg_cap;
4978 banks[1] = mce->status;
4979 banks[2] = mce->addr;
4980 banks[3] = mce->misc;
4981 vcpu->arch.mcg_status = mce->mcg_status;
4983 if (!(mcg_cap & MCG_CMCI_P) ||
4984 !(vcpu->arch.mci_ctl2_banks[mce->bank] & MCI_CTL2_CMCI_EN))
4987 if (lapic_in_kernel(vcpu))
4988 kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTCMCI);
4993 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
4994 struct kvm_x86_mce *mce)
4996 u64 mcg_cap = vcpu->arch.mcg_cap;
4997 unsigned bank_num = mcg_cap & 0xff;
4998 u64 *banks = vcpu->arch.mce_banks;
5000 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
5003 banks += array_index_nospec(4 * mce->bank, 4 * bank_num);
5006 return kvm_vcpu_x86_set_ucna(vcpu, mce, banks);
5009 * if IA32_MCG_CTL is not all 1s, the uncorrected error
5010 * reporting is disabled
5012 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
5013 vcpu->arch.mcg_ctl != ~(u64)0)
5016 * if IA32_MCi_CTL is not all 1s, the uncorrected error
5017 * reporting is disabled for the bank
5019 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
5021 if (mce->status & MCI_STATUS_UC) {
5022 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
5023 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
5024 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
5027 if (banks[1] & MCI_STATUS_VAL)
5028 mce->status |= MCI_STATUS_OVER;
5029 banks[2] = mce->addr;
5030 banks[3] = mce->misc;
5031 vcpu->arch.mcg_status = mce->mcg_status;
5032 banks[1] = mce->status;
5033 kvm_queue_exception(vcpu, MC_VECTOR);
5034 } else if (!(banks[1] & MCI_STATUS_VAL)
5035 || !(banks[1] & MCI_STATUS_UC)) {
5036 if (banks[1] & MCI_STATUS_VAL)
5037 mce->status |= MCI_STATUS_OVER;
5038 banks[2] = mce->addr;
5039 banks[3] = mce->misc;
5040 banks[1] = mce->status;
5042 banks[1] |= MCI_STATUS_OVER;
5046 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
5047 struct kvm_vcpu_events *events)
5049 struct kvm_queued_exception *ex;
5053 #ifdef CONFIG_KVM_SMM
5054 if (kvm_check_request(KVM_REQ_SMI, vcpu))
5059 * KVM's ABI only allows for one exception to be migrated. Luckily,
5060 * the only time there can be two queued exceptions is if there's a
5061 * non-exiting _injected_ exception, and a pending exiting exception.
5062 * In that case, ignore the VM-Exiting exception as it's an extension
5063 * of the injected exception.
5065 if (vcpu->arch.exception_vmexit.pending &&
5066 !vcpu->arch.exception.pending &&
5067 !vcpu->arch.exception.injected)
5068 ex = &vcpu->arch.exception_vmexit;
5070 ex = &vcpu->arch.exception;
5073 * In guest mode, payload delivery should be deferred if the exception
5074 * will be intercepted by L1, e.g. KVM should not modifying CR2 if L1
5075 * intercepts #PF, ditto for DR6 and #DBs. If the per-VM capability,
5076 * KVM_CAP_EXCEPTION_PAYLOAD, is not set, userspace may or may not
5077 * propagate the payload and so it cannot be safely deferred. Deliver
5078 * the payload if the capability hasn't been requested.
5080 if (!vcpu->kvm->arch.exception_payload_enabled &&
5081 ex->pending && ex->has_payload)
5082 kvm_deliver_exception_payload(vcpu, ex);
5084 memset(events, 0, sizeof(*events));
5087 * The API doesn't provide the instruction length for software
5088 * exceptions, so don't report them. As long as the guest RIP
5089 * isn't advanced, we should expect to encounter the exception
5092 if (!kvm_exception_is_soft(ex->vector)) {
5093 events->exception.injected = ex->injected;
5094 events->exception.pending = ex->pending;
5096 * For ABI compatibility, deliberately conflate
5097 * pending and injected exceptions when
5098 * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled.
5100 if (!vcpu->kvm->arch.exception_payload_enabled)
5101 events->exception.injected |= ex->pending;
5103 events->exception.nr = ex->vector;
5104 events->exception.has_error_code = ex->has_error_code;
5105 events->exception.error_code = ex->error_code;
5106 events->exception_has_payload = ex->has_payload;
5107 events->exception_payload = ex->payload;
5109 events->interrupt.injected =
5110 vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft;
5111 events->interrupt.nr = vcpu->arch.interrupt.nr;
5112 events->interrupt.shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
5114 events->nmi.injected = vcpu->arch.nmi_injected;
5115 events->nmi.pending = vcpu->arch.nmi_pending != 0;
5116 events->nmi.masked = static_call(kvm_x86_get_nmi_mask)(vcpu);
5118 /* events->sipi_vector is never valid when reporting to user space */
5120 #ifdef CONFIG_KVM_SMM
5121 events->smi.smm = is_smm(vcpu);
5122 events->smi.pending = vcpu->arch.smi_pending;
5123 events->smi.smm_inside_nmi =
5124 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK);
5126 events->smi.latched_init = kvm_lapic_latched_init(vcpu);
5128 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
5129 | KVM_VCPUEVENT_VALID_SHADOW
5130 | KVM_VCPUEVENT_VALID_SMM);
5131 if (vcpu->kvm->arch.exception_payload_enabled)
5132 events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD;
5133 if (vcpu->kvm->arch.triple_fault_event) {
5134 events->triple_fault.pending = kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu);
5135 events->flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
5139 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
5140 struct kvm_vcpu_events *events)
5142 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
5143 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
5144 | KVM_VCPUEVENT_VALID_SHADOW
5145 | KVM_VCPUEVENT_VALID_SMM
5146 | KVM_VCPUEVENT_VALID_PAYLOAD
5147 | KVM_VCPUEVENT_VALID_TRIPLE_FAULT))
5150 if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) {
5151 if (!vcpu->kvm->arch.exception_payload_enabled)
5153 if (events->exception.pending)
5154 events->exception.injected = 0;
5156 events->exception_has_payload = 0;
5158 events->exception.pending = 0;
5159 events->exception_has_payload = 0;
5162 if ((events->exception.injected || events->exception.pending) &&
5163 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR))
5166 /* INITs are latched while in SMM */
5167 if (events->flags & KVM_VCPUEVENT_VALID_SMM &&
5168 (events->smi.smm || events->smi.pending) &&
5169 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED)
5175 * Flag that userspace is stuffing an exception, the next KVM_RUN will
5176 * morph the exception to a VM-Exit if appropriate. Do this only for
5177 * pending exceptions, already-injected exceptions are not subject to
5178 * intercpetion. Note, userspace that conflates pending and injected
5179 * is hosed, and will incorrectly convert an injected exception into a
5180 * pending exception, which in turn may cause a spurious VM-Exit.
5182 vcpu->arch.exception_from_userspace = events->exception.pending;
5184 vcpu->arch.exception_vmexit.pending = false;
5186 vcpu->arch.exception.injected = events->exception.injected;
5187 vcpu->arch.exception.pending = events->exception.pending;
5188 vcpu->arch.exception.vector = events->exception.nr;
5189 vcpu->arch.exception.has_error_code = events->exception.has_error_code;
5190 vcpu->arch.exception.error_code = events->exception.error_code;
5191 vcpu->arch.exception.has_payload = events->exception_has_payload;
5192 vcpu->arch.exception.payload = events->exception_payload;
5194 vcpu->arch.interrupt.injected = events->interrupt.injected;
5195 vcpu->arch.interrupt.nr = events->interrupt.nr;
5196 vcpu->arch.interrupt.soft = events->interrupt.soft;
5197 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
5198 static_call(kvm_x86_set_interrupt_shadow)(vcpu,
5199 events->interrupt.shadow);
5201 vcpu->arch.nmi_injected = events->nmi.injected;
5202 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
5203 vcpu->arch.nmi_pending = events->nmi.pending;
5204 static_call(kvm_x86_set_nmi_mask)(vcpu, events->nmi.masked);
5206 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR &&
5207 lapic_in_kernel(vcpu))
5208 vcpu->arch.apic->sipi_vector = events->sipi_vector;
5210 if (events->flags & KVM_VCPUEVENT_VALID_SMM) {
5211 #ifdef CONFIG_KVM_SMM
5212 if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm) {
5213 kvm_leave_nested(vcpu);
5214 kvm_smm_changed(vcpu, events->smi.smm);
5217 vcpu->arch.smi_pending = events->smi.pending;
5219 if (events->smi.smm) {
5220 if (events->smi.smm_inside_nmi)
5221 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
5223 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK;
5227 if (events->smi.smm || events->smi.pending ||
5228 events->smi.smm_inside_nmi)
5232 if (lapic_in_kernel(vcpu)) {
5233 if (events->smi.latched_init)
5234 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
5236 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
5240 if (events->flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT) {
5241 if (!vcpu->kvm->arch.triple_fault_event)
5243 if (events->triple_fault.pending)
5244 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
5246 kvm_clear_request(KVM_REQ_TRIPLE_FAULT, vcpu);
5249 kvm_make_request(KVM_REQ_EVENT, vcpu);
5254 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
5255 struct kvm_debugregs *dbgregs)
5259 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
5260 kvm_get_dr(vcpu, 6, &val);
5262 dbgregs->dr7 = vcpu->arch.dr7;
5264 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
5267 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
5268 struct kvm_debugregs *dbgregs)
5273 if (!kvm_dr6_valid(dbgregs->dr6))
5275 if (!kvm_dr7_valid(dbgregs->dr7))
5278 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
5279 kvm_update_dr0123(vcpu);
5280 vcpu->arch.dr6 = dbgregs->dr6;
5281 vcpu->arch.dr7 = dbgregs->dr7;
5282 kvm_update_dr7(vcpu);
5287 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
5288 struct kvm_xsave *guest_xsave)
5290 if (fpstate_is_confidential(&vcpu->arch.guest_fpu))
5293 fpu_copy_guest_fpstate_to_uabi(&vcpu->arch.guest_fpu,
5294 guest_xsave->region,
5295 sizeof(guest_xsave->region),
5299 static void kvm_vcpu_ioctl_x86_get_xsave2(struct kvm_vcpu *vcpu,
5300 u8 *state, unsigned int size)
5302 if (fpstate_is_confidential(&vcpu->arch.guest_fpu))
5305 fpu_copy_guest_fpstate_to_uabi(&vcpu->arch.guest_fpu,
5306 state, size, vcpu->arch.pkru);
5309 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
5310 struct kvm_xsave *guest_xsave)
5312 if (fpstate_is_confidential(&vcpu->arch.guest_fpu))
5315 return fpu_copy_uabi_to_guest_fpstate(&vcpu->arch.guest_fpu,
5316 guest_xsave->region,
5317 kvm_caps.supported_xcr0,
5321 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
5322 struct kvm_xcrs *guest_xcrs)
5324 if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
5325 guest_xcrs->nr_xcrs = 0;
5329 guest_xcrs->nr_xcrs = 1;
5330 guest_xcrs->flags = 0;
5331 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
5332 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
5335 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
5336 struct kvm_xcrs *guest_xcrs)
5340 if (!boot_cpu_has(X86_FEATURE_XSAVE))
5343 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
5346 for (i = 0; i < guest_xcrs->nr_xcrs; i++)
5347 /* Only support XCR0 currently */
5348 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) {
5349 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
5350 guest_xcrs->xcrs[i].value);
5359 * kvm_set_guest_paused() indicates to the guest kernel that it has been
5360 * stopped by the hypervisor. This function will be called from the host only.
5361 * EINVAL is returned when the host attempts to set the flag for a guest that
5362 * does not support pv clocks.
5364 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
5366 if (!vcpu->arch.pv_time.active)
5368 vcpu->arch.pvclock_set_guest_stopped_request = true;
5369 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
5373 static int kvm_arch_tsc_has_attr(struct kvm_vcpu *vcpu,
5374 struct kvm_device_attr *attr)
5378 switch (attr->attr) {
5379 case KVM_VCPU_TSC_OFFSET:
5389 static int kvm_arch_tsc_get_attr(struct kvm_vcpu *vcpu,
5390 struct kvm_device_attr *attr)
5392 u64 __user *uaddr = kvm_get_attr_addr(attr);
5396 return PTR_ERR(uaddr);
5398 switch (attr->attr) {
5399 case KVM_VCPU_TSC_OFFSET:
5401 if (put_user(vcpu->arch.l1_tsc_offset, uaddr))
5412 static int kvm_arch_tsc_set_attr(struct kvm_vcpu *vcpu,
5413 struct kvm_device_attr *attr)
5415 u64 __user *uaddr = kvm_get_attr_addr(attr);
5416 struct kvm *kvm = vcpu->kvm;
5420 return PTR_ERR(uaddr);
5422 switch (attr->attr) {
5423 case KVM_VCPU_TSC_OFFSET: {
5424 u64 offset, tsc, ns;
5425 unsigned long flags;
5429 if (get_user(offset, uaddr))
5432 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
5434 matched = (vcpu->arch.virtual_tsc_khz &&
5435 kvm->arch.last_tsc_khz == vcpu->arch.virtual_tsc_khz &&
5436 kvm->arch.last_tsc_offset == offset);
5438 tsc = kvm_scale_tsc(rdtsc(), vcpu->arch.l1_tsc_scaling_ratio) + offset;
5439 ns = get_kvmclock_base_ns();
5441 __kvm_synchronize_tsc(vcpu, offset, tsc, ns, matched);
5442 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
5454 static int kvm_vcpu_ioctl_device_attr(struct kvm_vcpu *vcpu,
5458 struct kvm_device_attr attr;
5461 if (copy_from_user(&attr, argp, sizeof(attr)))
5464 if (attr.group != KVM_VCPU_TSC_CTRL)
5468 case KVM_HAS_DEVICE_ATTR:
5469 r = kvm_arch_tsc_has_attr(vcpu, &attr);
5471 case KVM_GET_DEVICE_ATTR:
5472 r = kvm_arch_tsc_get_attr(vcpu, &attr);
5474 case KVM_SET_DEVICE_ATTR:
5475 r = kvm_arch_tsc_set_attr(vcpu, &attr);
5482 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
5483 struct kvm_enable_cap *cap)
5486 uint16_t vmcs_version;
5487 void __user *user_ptr;
5493 case KVM_CAP_HYPERV_SYNIC2:
5498 case KVM_CAP_HYPERV_SYNIC:
5499 if (!irqchip_in_kernel(vcpu->kvm))
5501 return kvm_hv_activate_synic(vcpu, cap->cap ==
5502 KVM_CAP_HYPERV_SYNIC2);
5503 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
5504 if (!kvm_x86_ops.nested_ops->enable_evmcs)
5506 r = kvm_x86_ops.nested_ops->enable_evmcs(vcpu, &vmcs_version);
5508 user_ptr = (void __user *)(uintptr_t)cap->args[0];
5509 if (copy_to_user(user_ptr, &vmcs_version,
5510 sizeof(vmcs_version)))
5514 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
5515 if (!kvm_x86_ops.enable_l2_tlb_flush)
5518 return static_call(kvm_x86_enable_l2_tlb_flush)(vcpu);
5520 case KVM_CAP_HYPERV_ENFORCE_CPUID:
5521 return kvm_hv_set_enforce_cpuid(vcpu, cap->args[0]);
5523 case KVM_CAP_ENFORCE_PV_FEATURE_CPUID:
5524 vcpu->arch.pv_cpuid.enforce = cap->args[0];
5525 if (vcpu->arch.pv_cpuid.enforce)
5526 kvm_update_pv_runtime(vcpu);
5534 long kvm_arch_vcpu_ioctl(struct file *filp,
5535 unsigned int ioctl, unsigned long arg)
5537 struct kvm_vcpu *vcpu = filp->private_data;
5538 void __user *argp = (void __user *)arg;
5541 struct kvm_sregs2 *sregs2;
5542 struct kvm_lapic_state *lapic;
5543 struct kvm_xsave *xsave;
5544 struct kvm_xcrs *xcrs;
5552 case KVM_GET_LAPIC: {
5554 if (!lapic_in_kernel(vcpu))
5556 u.lapic = kzalloc(sizeof(struct kvm_lapic_state),
5557 GFP_KERNEL_ACCOUNT);
5562 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
5566 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
5571 case KVM_SET_LAPIC: {
5573 if (!lapic_in_kernel(vcpu))
5575 u.lapic = memdup_user(argp, sizeof(*u.lapic));
5576 if (IS_ERR(u.lapic)) {
5577 r = PTR_ERR(u.lapic);
5581 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
5584 case KVM_INTERRUPT: {
5585 struct kvm_interrupt irq;
5588 if (copy_from_user(&irq, argp, sizeof(irq)))
5590 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
5594 r = kvm_vcpu_ioctl_nmi(vcpu);
5598 r = kvm_inject_smi(vcpu);
5601 case KVM_SET_CPUID: {
5602 struct kvm_cpuid __user *cpuid_arg = argp;
5603 struct kvm_cpuid cpuid;
5606 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5608 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
5611 case KVM_SET_CPUID2: {
5612 struct kvm_cpuid2 __user *cpuid_arg = argp;
5613 struct kvm_cpuid2 cpuid;
5616 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5618 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
5619 cpuid_arg->entries);
5622 case KVM_GET_CPUID2: {
5623 struct kvm_cpuid2 __user *cpuid_arg = argp;
5624 struct kvm_cpuid2 cpuid;
5627 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
5629 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
5630 cpuid_arg->entries);
5634 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
5639 case KVM_GET_MSRS: {
5640 int idx = srcu_read_lock(&vcpu->kvm->srcu);
5641 r = msr_io(vcpu, argp, do_get_msr, 1);
5642 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5645 case KVM_SET_MSRS: {
5646 int idx = srcu_read_lock(&vcpu->kvm->srcu);
5647 r = msr_io(vcpu, argp, do_set_msr, 0);
5648 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5651 case KVM_TPR_ACCESS_REPORTING: {
5652 struct kvm_tpr_access_ctl tac;
5655 if (copy_from_user(&tac, argp, sizeof(tac)))
5657 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
5661 if (copy_to_user(argp, &tac, sizeof(tac)))
5666 case KVM_SET_VAPIC_ADDR: {
5667 struct kvm_vapic_addr va;
5671 if (!lapic_in_kernel(vcpu))
5674 if (copy_from_user(&va, argp, sizeof(va)))
5676 idx = srcu_read_lock(&vcpu->kvm->srcu);
5677 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
5678 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5681 case KVM_X86_SETUP_MCE: {
5685 if (copy_from_user(&mcg_cap, argp, sizeof(mcg_cap)))
5687 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
5690 case KVM_X86_SET_MCE: {
5691 struct kvm_x86_mce mce;
5694 if (copy_from_user(&mce, argp, sizeof(mce)))
5696 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
5699 case KVM_GET_VCPU_EVENTS: {
5700 struct kvm_vcpu_events events;
5702 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
5705 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
5710 case KVM_SET_VCPU_EVENTS: {
5711 struct kvm_vcpu_events events;
5714 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
5717 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
5720 case KVM_GET_DEBUGREGS: {
5721 struct kvm_debugregs dbgregs;
5723 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
5726 if (copy_to_user(argp, &dbgregs,
5727 sizeof(struct kvm_debugregs)))
5732 case KVM_SET_DEBUGREGS: {
5733 struct kvm_debugregs dbgregs;
5736 if (copy_from_user(&dbgregs, argp,
5737 sizeof(struct kvm_debugregs)))
5740 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
5743 case KVM_GET_XSAVE: {
5745 if (vcpu->arch.guest_fpu.uabi_size > sizeof(struct kvm_xsave))
5748 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL_ACCOUNT);
5753 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
5756 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
5761 case KVM_SET_XSAVE: {
5762 int size = vcpu->arch.guest_fpu.uabi_size;
5764 u.xsave = memdup_user(argp, size);
5765 if (IS_ERR(u.xsave)) {
5766 r = PTR_ERR(u.xsave);
5770 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
5774 case KVM_GET_XSAVE2: {
5775 int size = vcpu->arch.guest_fpu.uabi_size;
5777 u.xsave = kzalloc(size, GFP_KERNEL_ACCOUNT);
5782 kvm_vcpu_ioctl_x86_get_xsave2(vcpu, u.buffer, size);
5785 if (copy_to_user(argp, u.xsave, size))
5792 case KVM_GET_XCRS: {
5793 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL_ACCOUNT);
5798 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
5801 if (copy_to_user(argp, u.xcrs,
5802 sizeof(struct kvm_xcrs)))
5807 case KVM_SET_XCRS: {
5808 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
5809 if (IS_ERR(u.xcrs)) {
5810 r = PTR_ERR(u.xcrs);
5814 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
5817 case KVM_SET_TSC_KHZ: {
5821 user_tsc_khz = (u32)arg;
5823 if (kvm_caps.has_tsc_control &&
5824 user_tsc_khz >= kvm_caps.max_guest_tsc_khz)
5827 if (user_tsc_khz == 0)
5828 user_tsc_khz = tsc_khz;
5830 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz))
5835 case KVM_GET_TSC_KHZ: {
5836 r = vcpu->arch.virtual_tsc_khz;
5839 case KVM_KVMCLOCK_CTRL: {
5840 r = kvm_set_guest_paused(vcpu);
5843 case KVM_ENABLE_CAP: {
5844 struct kvm_enable_cap cap;
5847 if (copy_from_user(&cap, argp, sizeof(cap)))
5849 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
5852 case KVM_GET_NESTED_STATE: {
5853 struct kvm_nested_state __user *user_kvm_nested_state = argp;
5857 if (!kvm_x86_ops.nested_ops->get_state)
5860 BUILD_BUG_ON(sizeof(user_data_size) != sizeof(user_kvm_nested_state->size));
5862 if (get_user(user_data_size, &user_kvm_nested_state->size))
5865 r = kvm_x86_ops.nested_ops->get_state(vcpu, user_kvm_nested_state,
5870 if (r > user_data_size) {
5871 if (put_user(r, &user_kvm_nested_state->size))
5881 case KVM_SET_NESTED_STATE: {
5882 struct kvm_nested_state __user *user_kvm_nested_state = argp;
5883 struct kvm_nested_state kvm_state;
5887 if (!kvm_x86_ops.nested_ops->set_state)
5891 if (copy_from_user(&kvm_state, user_kvm_nested_state, sizeof(kvm_state)))
5895 if (kvm_state.size < sizeof(kvm_state))
5898 if (kvm_state.flags &
5899 ~(KVM_STATE_NESTED_RUN_PENDING | KVM_STATE_NESTED_GUEST_MODE
5900 | KVM_STATE_NESTED_EVMCS | KVM_STATE_NESTED_MTF_PENDING
5901 | KVM_STATE_NESTED_GIF_SET))
5904 /* nested_run_pending implies guest_mode. */
5905 if ((kvm_state.flags & KVM_STATE_NESTED_RUN_PENDING)
5906 && !(kvm_state.flags & KVM_STATE_NESTED_GUEST_MODE))
5909 idx = srcu_read_lock(&vcpu->kvm->srcu);
5910 r = kvm_x86_ops.nested_ops->set_state(vcpu, user_kvm_nested_state, &kvm_state);
5911 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5914 case KVM_GET_SUPPORTED_HV_CPUID:
5915 r = kvm_ioctl_get_supported_hv_cpuid(vcpu, argp);
5917 #ifdef CONFIG_KVM_XEN
5918 case KVM_XEN_VCPU_GET_ATTR: {
5919 struct kvm_xen_vcpu_attr xva;
5922 if (copy_from_user(&xva, argp, sizeof(xva)))
5924 r = kvm_xen_vcpu_get_attr(vcpu, &xva);
5925 if (!r && copy_to_user(argp, &xva, sizeof(xva)))
5929 case KVM_XEN_VCPU_SET_ATTR: {
5930 struct kvm_xen_vcpu_attr xva;
5933 if (copy_from_user(&xva, argp, sizeof(xva)))
5935 r = kvm_xen_vcpu_set_attr(vcpu, &xva);
5939 case KVM_GET_SREGS2: {
5940 u.sregs2 = kzalloc(sizeof(struct kvm_sregs2), GFP_KERNEL);
5944 __get_sregs2(vcpu, u.sregs2);
5946 if (copy_to_user(argp, u.sregs2, sizeof(struct kvm_sregs2)))
5951 case KVM_SET_SREGS2: {
5952 u.sregs2 = memdup_user(argp, sizeof(struct kvm_sregs2));
5953 if (IS_ERR(u.sregs2)) {
5954 r = PTR_ERR(u.sregs2);
5958 r = __set_sregs2(vcpu, u.sregs2);
5961 case KVM_HAS_DEVICE_ATTR:
5962 case KVM_GET_DEVICE_ATTR:
5963 case KVM_SET_DEVICE_ATTR:
5964 r = kvm_vcpu_ioctl_device_attr(vcpu, ioctl, argp);
5976 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
5978 return VM_FAULT_SIGBUS;
5981 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
5985 if (addr > (unsigned int)(-3 * PAGE_SIZE))
5987 ret = static_call(kvm_x86_set_tss_addr)(kvm, addr);
5991 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
5994 return static_call(kvm_x86_set_identity_map_addr)(kvm, ident_addr);
5997 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
5998 unsigned long kvm_nr_mmu_pages)
6000 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
6003 mutex_lock(&kvm->slots_lock);
6005 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
6006 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
6008 mutex_unlock(&kvm->slots_lock);
6012 static unsigned long kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
6014 return kvm->arch.n_max_mmu_pages;
6017 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
6019 struct kvm_pic *pic = kvm->arch.vpic;
6023 switch (chip->chip_id) {
6024 case KVM_IRQCHIP_PIC_MASTER:
6025 memcpy(&chip->chip.pic, &pic->pics[0],
6026 sizeof(struct kvm_pic_state));
6028 case KVM_IRQCHIP_PIC_SLAVE:
6029 memcpy(&chip->chip.pic, &pic->pics[1],
6030 sizeof(struct kvm_pic_state));
6032 case KVM_IRQCHIP_IOAPIC:
6033 kvm_get_ioapic(kvm, &chip->chip.ioapic);
6042 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
6044 struct kvm_pic *pic = kvm->arch.vpic;
6048 switch (chip->chip_id) {
6049 case KVM_IRQCHIP_PIC_MASTER:
6050 spin_lock(&pic->lock);
6051 memcpy(&pic->pics[0], &chip->chip.pic,
6052 sizeof(struct kvm_pic_state));
6053 spin_unlock(&pic->lock);
6055 case KVM_IRQCHIP_PIC_SLAVE:
6056 spin_lock(&pic->lock);
6057 memcpy(&pic->pics[1], &chip->chip.pic,
6058 sizeof(struct kvm_pic_state));
6059 spin_unlock(&pic->lock);
6061 case KVM_IRQCHIP_IOAPIC:
6062 kvm_set_ioapic(kvm, &chip->chip.ioapic);
6068 kvm_pic_update_irq(pic);
6072 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
6074 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state;
6076 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels));
6078 mutex_lock(&kps->lock);
6079 memcpy(ps, &kps->channels, sizeof(*ps));
6080 mutex_unlock(&kps->lock);
6084 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
6087 struct kvm_pit *pit = kvm->arch.vpit;
6089 mutex_lock(&pit->pit_state.lock);
6090 memcpy(&pit->pit_state.channels, ps, sizeof(*ps));
6091 for (i = 0; i < 3; i++)
6092 kvm_pit_load_count(pit, i, ps->channels[i].count, 0);
6093 mutex_unlock(&pit->pit_state.lock);
6097 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
6099 mutex_lock(&kvm->arch.vpit->pit_state.lock);
6100 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
6101 sizeof(ps->channels));
6102 ps->flags = kvm->arch.vpit->pit_state.flags;
6103 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
6104 memset(&ps->reserved, 0, sizeof(ps->reserved));
6108 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
6112 u32 prev_legacy, cur_legacy;
6113 struct kvm_pit *pit = kvm->arch.vpit;
6115 mutex_lock(&pit->pit_state.lock);
6116 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
6117 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
6118 if (!prev_legacy && cur_legacy)
6120 memcpy(&pit->pit_state.channels, &ps->channels,
6121 sizeof(pit->pit_state.channels));
6122 pit->pit_state.flags = ps->flags;
6123 for (i = 0; i < 3; i++)
6124 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count,
6126 mutex_unlock(&pit->pit_state.lock);
6130 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
6131 struct kvm_reinject_control *control)
6133 struct kvm_pit *pit = kvm->arch.vpit;
6135 /* pit->pit_state.lock was overloaded to prevent userspace from getting
6136 * an inconsistent state after running multiple KVM_REINJECT_CONTROL
6137 * ioctls in parallel. Use a separate lock if that ioctl isn't rare.
6139 mutex_lock(&pit->pit_state.lock);
6140 kvm_pit_set_reinject(pit, control->pit_reinject);
6141 mutex_unlock(&pit->pit_state.lock);
6146 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
6150 * Flush all CPUs' dirty log buffers to the dirty_bitmap. Called
6151 * before reporting dirty_bitmap to userspace. KVM flushes the buffers
6152 * on all VM-Exits, thus we only need to kick running vCPUs to force a
6155 struct kvm_vcpu *vcpu;
6158 kvm_for_each_vcpu(i, vcpu, kvm)
6159 kvm_vcpu_kick(vcpu);
6162 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
6165 if (!irqchip_in_kernel(kvm))
6168 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
6169 irq_event->irq, irq_event->level,
6174 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
6175 struct kvm_enable_cap *cap)
6183 case KVM_CAP_DISABLE_QUIRKS2:
6185 if (cap->args[0] & ~KVM_X86_VALID_QUIRKS)
6188 case KVM_CAP_DISABLE_QUIRKS:
6189 kvm->arch.disabled_quirks = cap->args[0];
6192 case KVM_CAP_SPLIT_IRQCHIP: {
6193 mutex_lock(&kvm->lock);
6195 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS)
6196 goto split_irqchip_unlock;
6198 if (irqchip_in_kernel(kvm))
6199 goto split_irqchip_unlock;
6200 if (kvm->created_vcpus)
6201 goto split_irqchip_unlock;
6202 r = kvm_setup_empty_irq_routing(kvm);
6204 goto split_irqchip_unlock;
6205 /* Pairs with irqchip_in_kernel. */
6207 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
6208 kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
6209 kvm_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_ABSENT);
6211 split_irqchip_unlock:
6212 mutex_unlock(&kvm->lock);
6215 case KVM_CAP_X2APIC_API:
6217 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS)
6220 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS)
6221 kvm->arch.x2apic_format = true;
6222 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
6223 kvm->arch.x2apic_broadcast_quirk_disabled = true;
6227 case KVM_CAP_X86_DISABLE_EXITS:
6229 if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS)
6232 if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) &&
6233 kvm_can_mwait_in_guest())
6234 kvm->arch.mwait_in_guest = true;
6235 if (cap->args[0] & KVM_X86_DISABLE_EXITS_HLT)
6236 kvm->arch.hlt_in_guest = true;
6237 if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE)
6238 kvm->arch.pause_in_guest = true;
6239 if (cap->args[0] & KVM_X86_DISABLE_EXITS_CSTATE)
6240 kvm->arch.cstate_in_guest = true;
6243 case KVM_CAP_MSR_PLATFORM_INFO:
6244 kvm->arch.guest_can_read_msr_platform_info = cap->args[0];
6247 case KVM_CAP_EXCEPTION_PAYLOAD:
6248 kvm->arch.exception_payload_enabled = cap->args[0];
6251 case KVM_CAP_X86_TRIPLE_FAULT_EVENT:
6252 kvm->arch.triple_fault_event = cap->args[0];
6255 case KVM_CAP_X86_USER_SPACE_MSR:
6257 if (cap->args[0] & ~KVM_MSR_EXIT_REASON_VALID_MASK)
6259 kvm->arch.user_space_msr_mask = cap->args[0];
6262 case KVM_CAP_X86_BUS_LOCK_EXIT:
6264 if (cap->args[0] & ~KVM_BUS_LOCK_DETECTION_VALID_MODE)
6267 if ((cap->args[0] & KVM_BUS_LOCK_DETECTION_OFF) &&
6268 (cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT))
6271 if (kvm_caps.has_bus_lock_exit &&
6272 cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT)
6273 kvm->arch.bus_lock_detection_enabled = true;
6276 #ifdef CONFIG_X86_SGX_KVM
6277 case KVM_CAP_SGX_ATTRIBUTE: {
6278 unsigned long allowed_attributes = 0;
6280 r = sgx_set_attribute(&allowed_attributes, cap->args[0]);
6284 /* KVM only supports the PROVISIONKEY privileged attribute. */
6285 if ((allowed_attributes & SGX_ATTR_PROVISIONKEY) &&
6286 !(allowed_attributes & ~SGX_ATTR_PROVISIONKEY))
6287 kvm->arch.sgx_provisioning_allowed = true;
6293 case KVM_CAP_VM_COPY_ENC_CONTEXT_FROM:
6295 if (!kvm_x86_ops.vm_copy_enc_context_from)
6298 r = static_call(kvm_x86_vm_copy_enc_context_from)(kvm, cap->args[0]);
6300 case KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM:
6302 if (!kvm_x86_ops.vm_move_enc_context_from)
6305 r = static_call(kvm_x86_vm_move_enc_context_from)(kvm, cap->args[0]);
6307 case KVM_CAP_EXIT_HYPERCALL:
6308 if (cap->args[0] & ~KVM_EXIT_HYPERCALL_VALID_MASK) {
6312 kvm->arch.hypercall_exit_enabled = cap->args[0];
6315 case KVM_CAP_EXIT_ON_EMULATION_FAILURE:
6317 if (cap->args[0] & ~1)
6319 kvm->arch.exit_on_emulation_error = cap->args[0];
6322 case KVM_CAP_PMU_CAPABILITY:
6324 if (!enable_pmu || (cap->args[0] & ~KVM_CAP_PMU_VALID_MASK))
6327 mutex_lock(&kvm->lock);
6328 if (!kvm->created_vcpus) {
6329 kvm->arch.enable_pmu = !(cap->args[0] & KVM_PMU_CAP_DISABLE);
6332 mutex_unlock(&kvm->lock);
6334 case KVM_CAP_MAX_VCPU_ID:
6336 if (cap->args[0] > KVM_MAX_VCPU_IDS)
6339 mutex_lock(&kvm->lock);
6340 if (kvm->arch.max_vcpu_ids == cap->args[0]) {
6342 } else if (!kvm->arch.max_vcpu_ids) {
6343 kvm->arch.max_vcpu_ids = cap->args[0];
6346 mutex_unlock(&kvm->lock);
6348 case KVM_CAP_X86_NOTIFY_VMEXIT:
6350 if ((u32)cap->args[0] & ~KVM_X86_NOTIFY_VMEXIT_VALID_BITS)
6352 if (!kvm_caps.has_notify_vmexit)
6354 if (!((u32)cap->args[0] & KVM_X86_NOTIFY_VMEXIT_ENABLED))
6356 mutex_lock(&kvm->lock);
6357 if (!kvm->created_vcpus) {
6358 kvm->arch.notify_window = cap->args[0] >> 32;
6359 kvm->arch.notify_vmexit_flags = (u32)cap->args[0];
6362 mutex_unlock(&kvm->lock);
6364 case KVM_CAP_VM_DISABLE_NX_HUGE_PAGES:
6368 * Since the risk of disabling NX hugepages is a guest crashing
6369 * the system, ensure the userspace process has permission to
6370 * reboot the system.
6372 * Note that unlike the reboot() syscall, the process must have
6373 * this capability in the root namespace because exposing
6374 * /dev/kvm into a container does not limit the scope of the
6375 * iTLB multihit bug to that container. In other words,
6376 * this must use capable(), not ns_capable().
6378 if (!capable(CAP_SYS_BOOT)) {
6386 mutex_lock(&kvm->lock);
6387 if (!kvm->created_vcpus) {
6388 kvm->arch.disable_nx_huge_pages = true;
6391 mutex_unlock(&kvm->lock);
6400 static struct kvm_x86_msr_filter *kvm_alloc_msr_filter(bool default_allow)
6402 struct kvm_x86_msr_filter *msr_filter;
6404 msr_filter = kzalloc(sizeof(*msr_filter), GFP_KERNEL_ACCOUNT);
6408 msr_filter->default_allow = default_allow;
6412 static void kvm_free_msr_filter(struct kvm_x86_msr_filter *msr_filter)
6419 for (i = 0; i < msr_filter->count; i++)
6420 kfree(msr_filter->ranges[i].bitmap);
6425 static int kvm_add_msr_filter(struct kvm_x86_msr_filter *msr_filter,
6426 struct kvm_msr_filter_range *user_range)
6428 unsigned long *bitmap = NULL;
6431 if (!user_range->nmsrs)
6434 if (user_range->flags & ~KVM_MSR_FILTER_RANGE_VALID_MASK)
6437 if (!user_range->flags)
6440 bitmap_size = BITS_TO_LONGS(user_range->nmsrs) * sizeof(long);
6441 if (!bitmap_size || bitmap_size > KVM_MSR_FILTER_MAX_BITMAP_SIZE)
6444 bitmap = memdup_user((__user u8*)user_range->bitmap, bitmap_size);
6446 return PTR_ERR(bitmap);
6448 msr_filter->ranges[msr_filter->count] = (struct msr_bitmap_range) {
6449 .flags = user_range->flags,
6450 .base = user_range->base,
6451 .nmsrs = user_range->nmsrs,
6455 msr_filter->count++;
6459 static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm,
6460 struct kvm_msr_filter *filter)
6462 struct kvm_x86_msr_filter *new_filter, *old_filter;
6468 if (filter->flags & ~KVM_MSR_FILTER_VALID_MASK)
6471 for (i = 0; i < ARRAY_SIZE(filter->ranges); i++)
6472 empty &= !filter->ranges[i].nmsrs;
6474 default_allow = !(filter->flags & KVM_MSR_FILTER_DEFAULT_DENY);
6475 if (empty && !default_allow)
6478 new_filter = kvm_alloc_msr_filter(default_allow);
6482 for (i = 0; i < ARRAY_SIZE(filter->ranges); i++) {
6483 r = kvm_add_msr_filter(new_filter, &filter->ranges[i]);
6485 kvm_free_msr_filter(new_filter);
6490 mutex_lock(&kvm->lock);
6492 /* The per-VM filter is protected by kvm->lock... */
6493 old_filter = srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1);
6495 rcu_assign_pointer(kvm->arch.msr_filter, new_filter);
6496 synchronize_srcu(&kvm->srcu);
6498 kvm_free_msr_filter(old_filter);
6500 kvm_make_all_cpus_request(kvm, KVM_REQ_MSR_FILTER_CHANGED);
6501 mutex_unlock(&kvm->lock);
6506 #ifdef CONFIG_KVM_COMPAT
6507 /* for KVM_X86_SET_MSR_FILTER */
6508 struct kvm_msr_filter_range_compat {
6515 struct kvm_msr_filter_compat {
6517 struct kvm_msr_filter_range_compat ranges[KVM_MSR_FILTER_MAX_RANGES];
6520 #define KVM_X86_SET_MSR_FILTER_COMPAT _IOW(KVMIO, 0xc6, struct kvm_msr_filter_compat)
6522 long kvm_arch_vm_compat_ioctl(struct file *filp, unsigned int ioctl,
6525 void __user *argp = (void __user *)arg;
6526 struct kvm *kvm = filp->private_data;
6530 case KVM_X86_SET_MSR_FILTER_COMPAT: {
6531 struct kvm_msr_filter __user *user_msr_filter = argp;
6532 struct kvm_msr_filter_compat filter_compat;
6533 struct kvm_msr_filter filter;
6536 if (copy_from_user(&filter_compat, user_msr_filter,
6537 sizeof(filter_compat)))
6540 filter.flags = filter_compat.flags;
6541 for (i = 0; i < ARRAY_SIZE(filter.ranges); i++) {
6542 struct kvm_msr_filter_range_compat *cr;
6544 cr = &filter_compat.ranges[i];
6545 filter.ranges[i] = (struct kvm_msr_filter_range) {
6549 .bitmap = (__u8 *)(ulong)cr->bitmap,
6553 r = kvm_vm_ioctl_set_msr_filter(kvm, &filter);
6562 #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
6563 static int kvm_arch_suspend_notifier(struct kvm *kvm)
6565 struct kvm_vcpu *vcpu;
6569 mutex_lock(&kvm->lock);
6570 kvm_for_each_vcpu(i, vcpu, kvm) {
6571 if (!vcpu->arch.pv_time.active)
6574 ret = kvm_set_guest_paused(vcpu);
6576 kvm_err("Failed to pause guest VCPU%d: %d\n",
6577 vcpu->vcpu_id, ret);
6581 mutex_unlock(&kvm->lock);
6583 return ret ? NOTIFY_BAD : NOTIFY_DONE;
6586 int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state)
6589 case PM_HIBERNATION_PREPARE:
6590 case PM_SUSPEND_PREPARE:
6591 return kvm_arch_suspend_notifier(kvm);
6596 #endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */
6598 static int kvm_vm_ioctl_get_clock(struct kvm *kvm, void __user *argp)
6600 struct kvm_clock_data data = { 0 };
6602 get_kvmclock(kvm, &data);
6603 if (copy_to_user(argp, &data, sizeof(data)))
6609 static int kvm_vm_ioctl_set_clock(struct kvm *kvm, void __user *argp)
6611 struct kvm_arch *ka = &kvm->arch;
6612 struct kvm_clock_data data;
6615 if (copy_from_user(&data, argp, sizeof(data)))
6619 * Only KVM_CLOCK_REALTIME is used, but allow passing the
6620 * result of KVM_GET_CLOCK back to KVM_SET_CLOCK.
6622 if (data.flags & ~KVM_CLOCK_VALID_FLAGS)
6625 kvm_hv_request_tsc_page_update(kvm);
6626 kvm_start_pvclock_update(kvm);
6627 pvclock_update_vm_gtod_copy(kvm);
6630 * This pairs with kvm_guest_time_update(): when masterclock is
6631 * in use, we use master_kernel_ns + kvmclock_offset to set
6632 * unsigned 'system_time' so if we use get_kvmclock_ns() (which
6633 * is slightly ahead) here we risk going negative on unsigned
6634 * 'system_time' when 'data.clock' is very small.
6636 if (data.flags & KVM_CLOCK_REALTIME) {
6637 u64 now_real_ns = ktime_get_real_ns();
6640 * Avoid stepping the kvmclock backwards.
6642 if (now_real_ns > data.realtime)
6643 data.clock += now_real_ns - data.realtime;
6646 if (ka->use_master_clock)
6647 now_raw_ns = ka->master_kernel_ns;
6649 now_raw_ns = get_kvmclock_base_ns();
6650 ka->kvmclock_offset = data.clock - now_raw_ns;
6651 kvm_end_pvclock_update(kvm);
6655 long kvm_arch_vm_ioctl(struct file *filp,
6656 unsigned int ioctl, unsigned long arg)
6658 struct kvm *kvm = filp->private_data;
6659 void __user *argp = (void __user *)arg;
6662 * This union makes it completely explicit to gcc-3.x
6663 * that these two variables' stack usage should be
6664 * combined, not added together.
6667 struct kvm_pit_state ps;
6668 struct kvm_pit_state2 ps2;
6669 struct kvm_pit_config pit_config;
6673 case KVM_SET_TSS_ADDR:
6674 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
6676 case KVM_SET_IDENTITY_MAP_ADDR: {
6679 mutex_lock(&kvm->lock);
6681 if (kvm->created_vcpus)
6682 goto set_identity_unlock;
6684 if (copy_from_user(&ident_addr, argp, sizeof(ident_addr)))
6685 goto set_identity_unlock;
6686 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
6687 set_identity_unlock:
6688 mutex_unlock(&kvm->lock);
6691 case KVM_SET_NR_MMU_PAGES:
6692 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
6694 case KVM_GET_NR_MMU_PAGES:
6695 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
6697 case KVM_CREATE_IRQCHIP: {
6698 mutex_lock(&kvm->lock);
6701 if (irqchip_in_kernel(kvm))
6702 goto create_irqchip_unlock;
6705 if (kvm->created_vcpus)
6706 goto create_irqchip_unlock;
6708 r = kvm_pic_init(kvm);
6710 goto create_irqchip_unlock;
6712 r = kvm_ioapic_init(kvm);
6714 kvm_pic_destroy(kvm);
6715 goto create_irqchip_unlock;
6718 r = kvm_setup_default_irq_routing(kvm);
6720 kvm_ioapic_destroy(kvm);
6721 kvm_pic_destroy(kvm);
6722 goto create_irqchip_unlock;
6724 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */
6726 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
6727 kvm_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_ABSENT);
6728 create_irqchip_unlock:
6729 mutex_unlock(&kvm->lock);
6732 case KVM_CREATE_PIT:
6733 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
6735 case KVM_CREATE_PIT2:
6737 if (copy_from_user(&u.pit_config, argp,
6738 sizeof(struct kvm_pit_config)))
6741 mutex_lock(&kvm->lock);
6744 goto create_pit_unlock;
6746 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
6750 mutex_unlock(&kvm->lock);
6752 case KVM_GET_IRQCHIP: {
6753 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
6754 struct kvm_irqchip *chip;
6756 chip = memdup_user(argp, sizeof(*chip));
6763 if (!irqchip_kernel(kvm))
6764 goto get_irqchip_out;
6765 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
6767 goto get_irqchip_out;
6769 if (copy_to_user(argp, chip, sizeof(*chip)))
6770 goto get_irqchip_out;
6776 case KVM_SET_IRQCHIP: {
6777 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
6778 struct kvm_irqchip *chip;
6780 chip = memdup_user(argp, sizeof(*chip));
6787 if (!irqchip_kernel(kvm))
6788 goto set_irqchip_out;
6789 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
6796 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
6799 if (!kvm->arch.vpit)
6801 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
6805 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
6812 if (copy_from_user(&u.ps, argp, sizeof(u.ps)))
6814 mutex_lock(&kvm->lock);
6816 if (!kvm->arch.vpit)
6818 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
6820 mutex_unlock(&kvm->lock);
6823 case KVM_GET_PIT2: {
6825 if (!kvm->arch.vpit)
6827 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
6831 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
6836 case KVM_SET_PIT2: {
6838 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
6840 mutex_lock(&kvm->lock);
6842 if (!kvm->arch.vpit)
6844 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
6846 mutex_unlock(&kvm->lock);
6849 case KVM_REINJECT_CONTROL: {
6850 struct kvm_reinject_control control;
6852 if (copy_from_user(&control, argp, sizeof(control)))
6855 if (!kvm->arch.vpit)
6857 r = kvm_vm_ioctl_reinject(kvm, &control);
6860 case KVM_SET_BOOT_CPU_ID:
6862 mutex_lock(&kvm->lock);
6863 if (kvm->created_vcpus)
6866 kvm->arch.bsp_vcpu_id = arg;
6867 mutex_unlock(&kvm->lock);
6869 #ifdef CONFIG_KVM_XEN
6870 case KVM_XEN_HVM_CONFIG: {
6871 struct kvm_xen_hvm_config xhc;
6873 if (copy_from_user(&xhc, argp, sizeof(xhc)))
6875 r = kvm_xen_hvm_config(kvm, &xhc);
6878 case KVM_XEN_HVM_GET_ATTR: {
6879 struct kvm_xen_hvm_attr xha;
6882 if (copy_from_user(&xha, argp, sizeof(xha)))
6884 r = kvm_xen_hvm_get_attr(kvm, &xha);
6885 if (!r && copy_to_user(argp, &xha, sizeof(xha)))
6889 case KVM_XEN_HVM_SET_ATTR: {
6890 struct kvm_xen_hvm_attr xha;
6893 if (copy_from_user(&xha, argp, sizeof(xha)))
6895 r = kvm_xen_hvm_set_attr(kvm, &xha);
6898 case KVM_XEN_HVM_EVTCHN_SEND: {
6899 struct kvm_irq_routing_xen_evtchn uxe;
6902 if (copy_from_user(&uxe, argp, sizeof(uxe)))
6904 r = kvm_xen_hvm_evtchn_send(kvm, &uxe);
6909 r = kvm_vm_ioctl_set_clock(kvm, argp);
6912 r = kvm_vm_ioctl_get_clock(kvm, argp);
6914 case KVM_SET_TSC_KHZ: {
6918 user_tsc_khz = (u32)arg;
6920 if (kvm_caps.has_tsc_control &&
6921 user_tsc_khz >= kvm_caps.max_guest_tsc_khz)
6924 if (user_tsc_khz == 0)
6925 user_tsc_khz = tsc_khz;
6927 WRITE_ONCE(kvm->arch.default_tsc_khz, user_tsc_khz);
6932 case KVM_GET_TSC_KHZ: {
6933 r = READ_ONCE(kvm->arch.default_tsc_khz);
6936 case KVM_MEMORY_ENCRYPT_OP: {
6938 if (!kvm_x86_ops.mem_enc_ioctl)
6941 r = static_call(kvm_x86_mem_enc_ioctl)(kvm, argp);
6944 case KVM_MEMORY_ENCRYPT_REG_REGION: {
6945 struct kvm_enc_region region;
6948 if (copy_from_user(®ion, argp, sizeof(region)))
6952 if (!kvm_x86_ops.mem_enc_register_region)
6955 r = static_call(kvm_x86_mem_enc_register_region)(kvm, ®ion);
6958 case KVM_MEMORY_ENCRYPT_UNREG_REGION: {
6959 struct kvm_enc_region region;
6962 if (copy_from_user(®ion, argp, sizeof(region)))
6966 if (!kvm_x86_ops.mem_enc_unregister_region)
6969 r = static_call(kvm_x86_mem_enc_unregister_region)(kvm, ®ion);
6972 case KVM_HYPERV_EVENTFD: {
6973 struct kvm_hyperv_eventfd hvevfd;
6976 if (copy_from_user(&hvevfd, argp, sizeof(hvevfd)))
6978 r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd);
6981 case KVM_SET_PMU_EVENT_FILTER:
6982 r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp);
6984 case KVM_X86_SET_MSR_FILTER: {
6985 struct kvm_msr_filter __user *user_msr_filter = argp;
6986 struct kvm_msr_filter filter;
6988 if (copy_from_user(&filter, user_msr_filter, sizeof(filter)))
6991 r = kvm_vm_ioctl_set_msr_filter(kvm, &filter);
7001 static void kvm_init_msr_list(void)
7006 BUILD_BUG_ON_MSG(KVM_PMC_MAX_FIXED != 3,
7007 "Please update the fixed PMCs in msrs_to_saved_all[]");
7009 num_msrs_to_save = 0;
7010 num_emulated_msrs = 0;
7011 num_msr_based_features = 0;
7013 for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) {
7014 if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0)
7018 * Even MSRs that are valid in the host may not be exposed
7019 * to the guests in some cases.
7021 switch (msrs_to_save_all[i]) {
7022 case MSR_IA32_BNDCFGS:
7023 if (!kvm_mpx_supported())
7027 if (!kvm_cpu_cap_has(X86_FEATURE_RDTSCP) &&
7028 !kvm_cpu_cap_has(X86_FEATURE_RDPID))
7031 case MSR_IA32_UMWAIT_CONTROL:
7032 if (!kvm_cpu_cap_has(X86_FEATURE_WAITPKG))
7035 case MSR_IA32_RTIT_CTL:
7036 case MSR_IA32_RTIT_STATUS:
7037 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT))
7040 case MSR_IA32_RTIT_CR3_MATCH:
7041 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
7042 !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering))
7045 case MSR_IA32_RTIT_OUTPUT_BASE:
7046 case MSR_IA32_RTIT_OUTPUT_MASK:
7047 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
7048 (!intel_pt_validate_hw_cap(PT_CAP_topa_output) &&
7049 !intel_pt_validate_hw_cap(PT_CAP_single_range_output)))
7052 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B:
7053 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
7054 msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >=
7055 intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2)
7058 case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR_MAX:
7059 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_PERFCTR0 >=
7060 min(KVM_INTEL_PMC_MAX_GENERIC, kvm_pmu_cap.num_counters_gp))
7063 case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL_MAX:
7064 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >=
7065 min(KVM_INTEL_PMC_MAX_GENERIC, kvm_pmu_cap.num_counters_gp))
7069 case MSR_IA32_XFD_ERR:
7070 if (!kvm_cpu_cap_has(X86_FEATURE_XFD))
7077 msrs_to_save[num_msrs_to_save++] = msrs_to_save_all[i];
7080 for (i = 0; i < ARRAY_SIZE(emulated_msrs_all); i++) {
7081 if (!static_call(kvm_x86_has_emulated_msr)(NULL, emulated_msrs_all[i]))
7084 emulated_msrs[num_emulated_msrs++] = emulated_msrs_all[i];
7087 for (i = 0; i < ARRAY_SIZE(msr_based_features_all); i++) {
7088 struct kvm_msr_entry msr;
7090 msr.index = msr_based_features_all[i];
7091 if (kvm_get_msr_feature(&msr))
7094 msr_based_features[num_msr_based_features++] = msr_based_features_all[i];
7098 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
7106 if (!(lapic_in_kernel(vcpu) &&
7107 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v))
7108 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v))
7119 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
7126 if (!(lapic_in_kernel(vcpu) &&
7127 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev,
7129 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v))
7131 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v);
7141 void kvm_set_segment(struct kvm_vcpu *vcpu,
7142 struct kvm_segment *var, int seg)
7144 static_call(kvm_x86_set_segment)(vcpu, var, seg);
7147 void kvm_get_segment(struct kvm_vcpu *vcpu,
7148 struct kvm_segment *var, int seg)
7150 static_call(kvm_x86_get_segment)(vcpu, var, seg);
7153 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access,
7154 struct x86_exception *exception)
7156 struct kvm_mmu *mmu = vcpu->arch.mmu;
7159 BUG_ON(!mmu_is_nested(vcpu));
7161 /* NPT walks are always user-walks */
7162 access |= PFERR_USER_MASK;
7163 t_gpa = mmu->gva_to_gpa(vcpu, mmu, gpa, access, exception);
7168 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
7169 struct x86_exception *exception)
7171 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7173 u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
7174 return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
7176 EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read);
7178 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
7179 struct x86_exception *exception)
7181 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7183 u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
7184 access |= PFERR_WRITE_MASK;
7185 return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
7187 EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_write);
7189 /* uses this to access any guest's mapped memory without checking CPL */
7190 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
7191 struct x86_exception *exception)
7193 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7195 return mmu->gva_to_gpa(vcpu, mmu, gva, 0, exception);
7198 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
7199 struct kvm_vcpu *vcpu, u64 access,
7200 struct x86_exception *exception)
7202 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7204 int r = X86EMUL_CONTINUE;
7207 gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access, exception);
7208 unsigned offset = addr & (PAGE_SIZE-1);
7209 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
7212 if (gpa == INVALID_GPA)
7213 return X86EMUL_PROPAGATE_FAULT;
7214 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
7217 r = X86EMUL_IO_NEEDED;
7229 /* used for instruction fetching */
7230 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
7231 gva_t addr, void *val, unsigned int bytes,
7232 struct x86_exception *exception)
7234 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7235 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7236 u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
7240 /* Inline kvm_read_guest_virt_helper for speed. */
7241 gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access|PFERR_FETCH_MASK,
7243 if (unlikely(gpa == INVALID_GPA))
7244 return X86EMUL_PROPAGATE_FAULT;
7246 offset = addr & (PAGE_SIZE-1);
7247 if (WARN_ON(offset + bytes > PAGE_SIZE))
7248 bytes = (unsigned)PAGE_SIZE - offset;
7249 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val,
7251 if (unlikely(ret < 0))
7252 return X86EMUL_IO_NEEDED;
7254 return X86EMUL_CONTINUE;
7257 int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
7258 gva_t addr, void *val, unsigned int bytes,
7259 struct x86_exception *exception)
7261 u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
7264 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED
7265 * is returned, but our callers are not ready for that and they blindly
7266 * call kvm_inject_page_fault. Ensure that they at least do not leak
7267 * uninitialized kernel stack memory into cr2 and error code.
7269 memset(exception, 0, sizeof(*exception));
7270 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
7273 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
7275 static int emulator_read_std(struct x86_emulate_ctxt *ctxt,
7276 gva_t addr, void *val, unsigned int bytes,
7277 struct x86_exception *exception, bool system)
7279 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7283 access |= PFERR_IMPLICIT_ACCESS;
7284 else if (static_call(kvm_x86_get_cpl)(vcpu) == 3)
7285 access |= PFERR_USER_MASK;
7287 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception);
7290 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
7291 struct kvm_vcpu *vcpu, u64 access,
7292 struct x86_exception *exception)
7294 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7296 int r = X86EMUL_CONTINUE;
7299 gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access, exception);
7300 unsigned offset = addr & (PAGE_SIZE-1);
7301 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
7304 if (gpa == INVALID_GPA)
7305 return X86EMUL_PROPAGATE_FAULT;
7306 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite);
7308 r = X86EMUL_IO_NEEDED;
7320 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val,
7321 unsigned int bytes, struct x86_exception *exception,
7324 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7325 u64 access = PFERR_WRITE_MASK;
7328 access |= PFERR_IMPLICIT_ACCESS;
7329 else if (static_call(kvm_x86_get_cpl)(vcpu) == 3)
7330 access |= PFERR_USER_MASK;
7332 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
7336 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val,
7337 unsigned int bytes, struct x86_exception *exception)
7339 /* kvm_write_guest_virt_system can pull in tons of pages. */
7340 vcpu->arch.l1tf_flush_l1d = true;
7342 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
7343 PFERR_WRITE_MASK, exception);
7345 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
7347 static int kvm_can_emulate_insn(struct kvm_vcpu *vcpu, int emul_type,
7348 void *insn, int insn_len)
7350 return static_call(kvm_x86_can_emulate_instruction)(vcpu, emul_type,
7354 int handle_ud(struct kvm_vcpu *vcpu)
7356 static const char kvm_emulate_prefix[] = { __KVM_EMULATE_PREFIX };
7357 int fep_flags = READ_ONCE(force_emulation_prefix);
7358 int emul_type = EMULTYPE_TRAP_UD;
7359 char sig[5]; /* ud2; .ascii "kvm" */
7360 struct x86_exception e;
7362 if (unlikely(!kvm_can_emulate_insn(vcpu, emul_type, NULL, 0)))
7366 kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu),
7367 sig, sizeof(sig), &e) == 0 &&
7368 memcmp(sig, kvm_emulate_prefix, sizeof(sig)) == 0) {
7369 if (fep_flags & KVM_FEP_CLEAR_RFLAGS_RF)
7370 kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) & ~X86_EFLAGS_RF);
7371 kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig));
7372 emul_type = EMULTYPE_TRAP_UD_FORCED;
7375 return kvm_emulate_instruction(vcpu, emul_type);
7377 EXPORT_SYMBOL_GPL(handle_ud);
7379 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
7380 gpa_t gpa, bool write)
7382 /* For APIC access vmexit */
7383 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
7386 if (vcpu_match_mmio_gpa(vcpu, gpa)) {
7387 trace_vcpu_match_mmio(gva, gpa, write, true);
7394 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
7395 gpa_t *gpa, struct x86_exception *exception,
7398 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
7399 u64 access = ((static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0)
7400 | (write ? PFERR_WRITE_MASK : 0);
7403 * currently PKRU is only applied to ept enabled guest so
7404 * there is no pkey in EPT page table for L1 guest or EPT
7405 * shadow page table for L2 guest.
7407 if (vcpu_match_mmio_gva(vcpu, gva) && (!is_paging(vcpu) ||
7408 !permission_fault(vcpu, vcpu->arch.walk_mmu,
7409 vcpu->arch.mmio_access, 0, access))) {
7410 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
7411 (gva & (PAGE_SIZE - 1));
7412 trace_vcpu_match_mmio(gva, *gpa, write, false);
7416 *gpa = mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
7418 if (*gpa == INVALID_GPA)
7421 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write);
7424 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
7425 const void *val, int bytes)
7429 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes);
7432 kvm_page_track_write(vcpu, gpa, val, bytes);
7436 struct read_write_emulator_ops {
7437 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
7439 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
7440 void *val, int bytes);
7441 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
7442 int bytes, void *val);
7443 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
7444 void *val, int bytes);
7448 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
7450 if (vcpu->mmio_read_completed) {
7451 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
7452 vcpu->mmio_fragments[0].gpa, val);
7453 vcpu->mmio_read_completed = 0;
7460 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
7461 void *val, int bytes)
7463 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes);
7466 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
7467 void *val, int bytes)
7469 return emulator_write_phys(vcpu, gpa, val, bytes);
7472 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
7474 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val);
7475 return vcpu_mmio_write(vcpu, gpa, bytes, val);
7478 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
7479 void *val, int bytes)
7481 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL);
7482 return X86EMUL_IO_NEEDED;
7485 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
7486 void *val, int bytes)
7488 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
7490 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
7491 return X86EMUL_CONTINUE;
7494 static const struct read_write_emulator_ops read_emultor = {
7495 .read_write_prepare = read_prepare,
7496 .read_write_emulate = read_emulate,
7497 .read_write_mmio = vcpu_mmio_read,
7498 .read_write_exit_mmio = read_exit_mmio,
7501 static const struct read_write_emulator_ops write_emultor = {
7502 .read_write_emulate = write_emulate,
7503 .read_write_mmio = write_mmio,
7504 .read_write_exit_mmio = write_exit_mmio,
7508 static int emulator_read_write_onepage(unsigned long addr, void *val,
7510 struct x86_exception *exception,
7511 struct kvm_vcpu *vcpu,
7512 const struct read_write_emulator_ops *ops)
7516 bool write = ops->write;
7517 struct kvm_mmio_fragment *frag;
7518 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
7521 * If the exit was due to a NPF we may already have a GPA.
7522 * If the GPA is present, use it to avoid the GVA to GPA table walk.
7523 * Note, this cannot be used on string operations since string
7524 * operation using rep will only have the initial GPA from the NPF
7527 if (ctxt->gpa_available && emulator_can_use_gpa(ctxt) &&
7528 (addr & ~PAGE_MASK) == (ctxt->gpa_val & ~PAGE_MASK)) {
7529 gpa = ctxt->gpa_val;
7530 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write);
7532 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
7534 return X86EMUL_PROPAGATE_FAULT;
7537 if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes))
7538 return X86EMUL_CONTINUE;
7541 * Is this MMIO handled locally?
7543 handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
7544 if (handled == bytes)
7545 return X86EMUL_CONTINUE;
7551 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS);
7552 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
7556 return X86EMUL_CONTINUE;
7559 static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
7561 void *val, unsigned int bytes,
7562 struct x86_exception *exception,
7563 const struct read_write_emulator_ops *ops)
7565 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7569 if (ops->read_write_prepare &&
7570 ops->read_write_prepare(vcpu, val, bytes))
7571 return X86EMUL_CONTINUE;
7573 vcpu->mmio_nr_fragments = 0;
7575 /* Crossing a page boundary? */
7576 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
7579 now = -addr & ~PAGE_MASK;
7580 rc = emulator_read_write_onepage(addr, val, now, exception,
7583 if (rc != X86EMUL_CONTINUE)
7586 if (ctxt->mode != X86EMUL_MODE_PROT64)
7592 rc = emulator_read_write_onepage(addr, val, bytes, exception,
7594 if (rc != X86EMUL_CONTINUE)
7597 if (!vcpu->mmio_nr_fragments)
7600 gpa = vcpu->mmio_fragments[0].gpa;
7602 vcpu->mmio_needed = 1;
7603 vcpu->mmio_cur_fragment = 0;
7605 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len);
7606 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
7607 vcpu->run->exit_reason = KVM_EXIT_MMIO;
7608 vcpu->run->mmio.phys_addr = gpa;
7610 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
7613 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
7617 struct x86_exception *exception)
7619 return emulator_read_write(ctxt, addr, val, bytes,
7620 exception, &read_emultor);
7623 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
7627 struct x86_exception *exception)
7629 return emulator_read_write(ctxt, addr, (void *)val, bytes,
7630 exception, &write_emultor);
7633 #define emulator_try_cmpxchg_user(t, ptr, old, new) \
7634 (__try_cmpxchg_user((t __user *)(ptr), (t *)(old), *(t *)(new), efault ## t))
7636 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
7641 struct x86_exception *exception)
7643 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7649 /* guests cmpxchg8b have to be emulated atomically */
7650 if (bytes > 8 || (bytes & (bytes - 1)))
7653 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
7655 if (gpa == INVALID_GPA ||
7656 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
7660 * Emulate the atomic as a straight write to avoid #AC if SLD is
7661 * enabled in the host and the access splits a cache line.
7663 if (boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT))
7664 page_line_mask = ~(cache_line_size() - 1);
7666 page_line_mask = PAGE_MASK;
7668 if (((gpa + bytes - 1) & page_line_mask) != (gpa & page_line_mask))
7671 hva = kvm_vcpu_gfn_to_hva(vcpu, gpa_to_gfn(gpa));
7672 if (kvm_is_error_hva(hva))
7675 hva += offset_in_page(gpa);
7679 r = emulator_try_cmpxchg_user(u8, hva, old, new);
7682 r = emulator_try_cmpxchg_user(u16, hva, old, new);
7685 r = emulator_try_cmpxchg_user(u32, hva, old, new);
7688 r = emulator_try_cmpxchg_user(u64, hva, old, new);
7695 return X86EMUL_UNHANDLEABLE;
7697 return X86EMUL_CMPXCHG_FAILED;
7699 kvm_page_track_write(vcpu, gpa, new, bytes);
7701 return X86EMUL_CONTINUE;
7704 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
7706 return emulator_write_emulated(ctxt, addr, new, bytes, exception);
7709 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
7710 unsigned short port, void *data,
7711 unsigned int count, bool in)
7716 WARN_ON_ONCE(vcpu->arch.pio.count);
7717 for (i = 0; i < count; i++) {
7719 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, port, size, data);
7721 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, port, size, data);
7728 * Userspace must have unregistered the device while PIO
7729 * was running. Drop writes / read as 0.
7732 memset(data, 0, size * (count - i));
7741 vcpu->arch.pio.port = port;
7742 vcpu->arch.pio.in = in;
7743 vcpu->arch.pio.count = count;
7744 vcpu->arch.pio.size = size;
7747 memset(vcpu->arch.pio_data, 0, size * count);
7749 memcpy(vcpu->arch.pio_data, data, size * count);
7751 vcpu->run->exit_reason = KVM_EXIT_IO;
7752 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
7753 vcpu->run->io.size = size;
7754 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
7755 vcpu->run->io.count = count;
7756 vcpu->run->io.port = port;
7760 static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
7761 unsigned short port, void *val, unsigned int count)
7763 int r = emulator_pio_in_out(vcpu, size, port, val, count, true);
7765 trace_kvm_pio(KVM_PIO_IN, port, size, count, val);
7770 static void complete_emulator_pio_in(struct kvm_vcpu *vcpu, void *val)
7772 int size = vcpu->arch.pio.size;
7773 unsigned int count = vcpu->arch.pio.count;
7774 memcpy(val, vcpu->arch.pio_data, size * count);
7775 trace_kvm_pio(KVM_PIO_IN, vcpu->arch.pio.port, size, count, vcpu->arch.pio_data);
7776 vcpu->arch.pio.count = 0;
7779 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
7780 int size, unsigned short port, void *val,
7783 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7784 if (vcpu->arch.pio.count) {
7786 * Complete a previous iteration that required userspace I/O.
7787 * Note, @count isn't guaranteed to match pio.count as userspace
7788 * can modify ECX before rerunning the vCPU. Ignore any such
7789 * shenanigans as KVM doesn't support modifying the rep count,
7790 * and the emulator ensures @count doesn't overflow the buffer.
7792 complete_emulator_pio_in(vcpu, val);
7796 return emulator_pio_in(vcpu, size, port, val, count);
7799 static int emulator_pio_out(struct kvm_vcpu *vcpu, int size,
7800 unsigned short port, const void *val,
7803 trace_kvm_pio(KVM_PIO_OUT, port, size, count, val);
7804 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
7807 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
7808 int size, unsigned short port,
7809 const void *val, unsigned int count)
7811 return emulator_pio_out(emul_to_vcpu(ctxt), size, port, val, count);
7814 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
7816 return static_call(kvm_x86_get_segment_base)(vcpu, seg);
7819 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
7821 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
7824 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu)
7826 if (!need_emulate_wbinvd(vcpu))
7827 return X86EMUL_CONTINUE;
7829 if (static_call(kvm_x86_has_wbinvd_exit)()) {
7830 int cpu = get_cpu();
7832 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
7833 on_each_cpu_mask(vcpu->arch.wbinvd_dirty_mask,
7834 wbinvd_ipi, NULL, 1);
7836 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
7839 return X86EMUL_CONTINUE;
7842 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
7844 kvm_emulate_wbinvd_noskip(vcpu);
7845 return kvm_skip_emulated_instruction(vcpu);
7847 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
7851 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
7853 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt));
7856 static void emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
7857 unsigned long *dest)
7859 kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
7862 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
7863 unsigned long value)
7866 return kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
7869 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
7871 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
7874 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
7876 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7877 unsigned long value;
7881 value = kvm_read_cr0(vcpu);
7884 value = vcpu->arch.cr2;
7887 value = kvm_read_cr3(vcpu);
7890 value = kvm_read_cr4(vcpu);
7893 value = kvm_get_cr8(vcpu);
7896 kvm_err("%s: unexpected cr %u\n", __func__, cr);
7903 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
7905 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
7910 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
7913 vcpu->arch.cr2 = val;
7916 res = kvm_set_cr3(vcpu, val);
7919 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
7922 res = kvm_set_cr8(vcpu, val);
7925 kvm_err("%s: unexpected cr %u\n", __func__, cr);
7932 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
7934 return static_call(kvm_x86_get_cpl)(emul_to_vcpu(ctxt));
7937 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7939 static_call(kvm_x86_get_gdt)(emul_to_vcpu(ctxt), dt);
7942 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7944 static_call(kvm_x86_get_idt)(emul_to_vcpu(ctxt), dt);
7947 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7949 static_call(kvm_x86_set_gdt)(emul_to_vcpu(ctxt), dt);
7952 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
7954 static_call(kvm_x86_set_idt)(emul_to_vcpu(ctxt), dt);
7957 static unsigned long emulator_get_cached_segment_base(
7958 struct x86_emulate_ctxt *ctxt, int seg)
7960 return get_segment_base(emul_to_vcpu(ctxt), seg);
7963 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
7964 struct desc_struct *desc, u32 *base3,
7967 struct kvm_segment var;
7969 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
7970 *selector = var.selector;
7973 memset(desc, 0, sizeof(*desc));
7981 set_desc_limit(desc, var.limit);
7982 set_desc_base(desc, (unsigned long)var.base);
7983 #ifdef CONFIG_X86_64
7985 *base3 = var.base >> 32;
7987 desc->type = var.type;
7989 desc->dpl = var.dpl;
7990 desc->p = var.present;
7991 desc->avl = var.avl;
7999 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
8000 struct desc_struct *desc, u32 base3,
8003 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8004 struct kvm_segment var;
8006 var.selector = selector;
8007 var.base = get_desc_base(desc);
8008 #ifdef CONFIG_X86_64
8009 var.base |= ((u64)base3) << 32;
8011 var.limit = get_desc_limit(desc);
8013 var.limit = (var.limit << 12) | 0xfff;
8014 var.type = desc->type;
8015 var.dpl = desc->dpl;
8020 var.avl = desc->avl;
8021 var.present = desc->p;
8022 var.unusable = !var.present;
8025 kvm_set_segment(vcpu, &var, seg);
8029 static int emulator_get_msr_with_filter(struct x86_emulate_ctxt *ctxt,
8030 u32 msr_index, u64 *pdata)
8032 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8035 r = kvm_get_msr_with_filter(vcpu, msr_index, pdata);
8037 return X86EMUL_UNHANDLEABLE;
8040 if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_RDMSR, 0,
8041 complete_emulated_rdmsr, r))
8042 return X86EMUL_IO_NEEDED;
8044 trace_kvm_msr_read_ex(msr_index);
8045 return X86EMUL_PROPAGATE_FAULT;
8048 trace_kvm_msr_read(msr_index, *pdata);
8049 return X86EMUL_CONTINUE;
8052 static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
8053 u32 msr_index, u64 data)
8055 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8058 r = kvm_set_msr_with_filter(vcpu, msr_index, data);
8060 return X86EMUL_UNHANDLEABLE;
8063 if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_WRMSR, data,
8064 complete_emulated_msr_access, r))
8065 return X86EMUL_IO_NEEDED;
8067 trace_kvm_msr_write_ex(msr_index, data);
8068 return X86EMUL_PROPAGATE_FAULT;
8071 trace_kvm_msr_write(msr_index, data);
8072 return X86EMUL_CONTINUE;
8075 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
8076 u32 msr_index, u64 *pdata)
8078 return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
8081 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt,
8084 if (kvm_pmu_is_valid_rdpmc_ecx(emul_to_vcpu(ctxt), pmc))
8089 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
8090 u32 pmc, u64 *pdata)
8092 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata);
8095 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
8097 emul_to_vcpu(ctxt)->arch.halt_request = 1;
8100 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
8101 struct x86_instruction_info *info,
8102 enum x86_intercept_stage stage)
8104 return static_call(kvm_x86_check_intercept)(emul_to_vcpu(ctxt), info, stage,
8108 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
8109 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx,
8112 return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, exact_only);
8115 static bool emulator_guest_has_long_mode(struct x86_emulate_ctxt *ctxt)
8117 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_LM);
8120 static bool emulator_guest_has_movbe(struct x86_emulate_ctxt *ctxt)
8122 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_MOVBE);
8125 static bool emulator_guest_has_fxsr(struct x86_emulate_ctxt *ctxt)
8127 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_FXSR);
8130 static bool emulator_guest_has_rdpid(struct x86_emulate_ctxt *ctxt)
8132 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_RDPID);
8135 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
8137 return kvm_register_read_raw(emul_to_vcpu(ctxt), reg);
8140 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
8142 kvm_register_write_raw(emul_to_vcpu(ctxt), reg, val);
8145 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
8147 static_call(kvm_x86_set_nmi_mask)(emul_to_vcpu(ctxt), masked);
8150 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
8152 return emul_to_vcpu(ctxt)->arch.hflags;
8155 #ifndef CONFIG_KVM_SMM
8156 static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
8159 return X86EMUL_UNHANDLEABLE;
8163 static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt)
8165 kvm_make_request(KVM_REQ_TRIPLE_FAULT, emul_to_vcpu(ctxt));
8168 static int emulator_set_xcr(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr)
8170 return __kvm_set_xcr(emul_to_vcpu(ctxt), index, xcr);
8173 static void emulator_vm_bugged(struct x86_emulate_ctxt *ctxt)
8175 struct kvm *kvm = emul_to_vcpu(ctxt)->kvm;
8177 if (!kvm->vm_bugged)
8181 static const struct x86_emulate_ops emulate_ops = {
8182 .vm_bugged = emulator_vm_bugged,
8183 .read_gpr = emulator_read_gpr,
8184 .write_gpr = emulator_write_gpr,
8185 .read_std = emulator_read_std,
8186 .write_std = emulator_write_std,
8187 .fetch = kvm_fetch_guest_virt,
8188 .read_emulated = emulator_read_emulated,
8189 .write_emulated = emulator_write_emulated,
8190 .cmpxchg_emulated = emulator_cmpxchg_emulated,
8191 .invlpg = emulator_invlpg,
8192 .pio_in_emulated = emulator_pio_in_emulated,
8193 .pio_out_emulated = emulator_pio_out_emulated,
8194 .get_segment = emulator_get_segment,
8195 .set_segment = emulator_set_segment,
8196 .get_cached_segment_base = emulator_get_cached_segment_base,
8197 .get_gdt = emulator_get_gdt,
8198 .get_idt = emulator_get_idt,
8199 .set_gdt = emulator_set_gdt,
8200 .set_idt = emulator_set_idt,
8201 .get_cr = emulator_get_cr,
8202 .set_cr = emulator_set_cr,
8203 .cpl = emulator_get_cpl,
8204 .get_dr = emulator_get_dr,
8205 .set_dr = emulator_set_dr,
8206 .set_msr_with_filter = emulator_set_msr_with_filter,
8207 .get_msr_with_filter = emulator_get_msr_with_filter,
8208 .get_msr = emulator_get_msr,
8209 .check_pmc = emulator_check_pmc,
8210 .read_pmc = emulator_read_pmc,
8211 .halt = emulator_halt,
8212 .wbinvd = emulator_wbinvd,
8213 .fix_hypercall = emulator_fix_hypercall,
8214 .intercept = emulator_intercept,
8215 .get_cpuid = emulator_get_cpuid,
8216 .guest_has_long_mode = emulator_guest_has_long_mode,
8217 .guest_has_movbe = emulator_guest_has_movbe,
8218 .guest_has_fxsr = emulator_guest_has_fxsr,
8219 .guest_has_rdpid = emulator_guest_has_rdpid,
8220 .set_nmi_mask = emulator_set_nmi_mask,
8221 .get_hflags = emulator_get_hflags,
8222 .leave_smm = emulator_leave_smm,
8223 .triple_fault = emulator_triple_fault,
8224 .set_xcr = emulator_set_xcr,
8227 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
8229 u32 int_shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
8231 * an sti; sti; sequence only disable interrupts for the first
8232 * instruction. So, if the last instruction, be it emulated or
8233 * not, left the system with the INT_STI flag enabled, it
8234 * means that the last instruction is an sti. We should not
8235 * leave the flag on in this case. The same goes for mov ss
8237 if (int_shadow & mask)
8239 if (unlikely(int_shadow || mask)) {
8240 static_call(kvm_x86_set_interrupt_shadow)(vcpu, mask);
8242 kvm_make_request(KVM_REQ_EVENT, vcpu);
8246 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
8248 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8250 if (ctxt->exception.vector == PF_VECTOR)
8251 kvm_inject_emulated_page_fault(vcpu, &ctxt->exception);
8252 else if (ctxt->exception.error_code_valid)
8253 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
8254 ctxt->exception.error_code);
8256 kvm_queue_exception(vcpu, ctxt->exception.vector);
8259 static struct x86_emulate_ctxt *alloc_emulate_ctxt(struct kvm_vcpu *vcpu)
8261 struct x86_emulate_ctxt *ctxt;
8263 ctxt = kmem_cache_zalloc(x86_emulator_cache, GFP_KERNEL_ACCOUNT);
8265 pr_err("kvm: failed to allocate vcpu's emulator\n");
8270 ctxt->ops = &emulate_ops;
8271 vcpu->arch.emulate_ctxt = ctxt;
8276 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
8278 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8281 static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l);
8283 ctxt->gpa_available = false;
8284 ctxt->eflags = kvm_get_rflags(vcpu);
8285 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
8287 ctxt->eip = kvm_rip_read(vcpu);
8288 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
8289 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 :
8290 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 :
8291 cs_db ? X86EMUL_MODE_PROT32 :
8292 X86EMUL_MODE_PROT16;
8293 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK);
8295 ctxt->interruptibility = 0;
8296 ctxt->have_exception = false;
8297 ctxt->exception.vector = -1;
8298 ctxt->perm_ok = false;
8300 init_decode_cache(ctxt);
8301 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
8304 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
8306 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8309 init_emulate_ctxt(vcpu);
8313 ctxt->_eip = ctxt->eip + inc_eip;
8314 ret = emulate_int_real(ctxt, irq);
8316 if (ret != X86EMUL_CONTINUE) {
8317 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
8319 ctxt->eip = ctxt->_eip;
8320 kvm_rip_write(vcpu, ctxt->eip);
8321 kvm_set_rflags(vcpu, ctxt->eflags);
8324 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
8326 static void prepare_emulation_failure_exit(struct kvm_vcpu *vcpu, u64 *data,
8327 u8 ndata, u8 *insn_bytes, u8 insn_size)
8329 struct kvm_run *run = vcpu->run;
8334 * Zero the whole array used to retrieve the exit info, as casting to
8335 * u32 for select entries will leave some chunks uninitialized.
8337 memset(&info, 0, sizeof(info));
8339 static_call(kvm_x86_get_exit_info)(vcpu, (u32 *)&info[0], &info[1],
8340 &info[2], (u32 *)&info[3],
8343 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
8344 run->emulation_failure.suberror = KVM_INTERNAL_ERROR_EMULATION;
8347 * There's currently space for 13 entries, but 5 are used for the exit
8348 * reason and info. Restrict to 4 to reduce the maintenance burden
8349 * when expanding kvm_run.emulation_failure in the future.
8351 if (WARN_ON_ONCE(ndata > 4))
8354 /* Always include the flags as a 'data' entry. */
8356 run->emulation_failure.flags = 0;
8359 BUILD_BUG_ON((sizeof(run->emulation_failure.insn_size) +
8360 sizeof(run->emulation_failure.insn_bytes) != 16));
8362 run->emulation_failure.flags |=
8363 KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES;
8364 run->emulation_failure.insn_size = insn_size;
8365 memset(run->emulation_failure.insn_bytes, 0x90,
8366 sizeof(run->emulation_failure.insn_bytes));
8367 memcpy(run->emulation_failure.insn_bytes, insn_bytes, insn_size);
8370 memcpy(&run->internal.data[info_start], info, sizeof(info));
8371 memcpy(&run->internal.data[info_start + ARRAY_SIZE(info)], data,
8372 ndata * sizeof(data[0]));
8374 run->emulation_failure.ndata = info_start + ARRAY_SIZE(info) + ndata;
8377 static void prepare_emulation_ctxt_failure_exit(struct kvm_vcpu *vcpu)
8379 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8381 prepare_emulation_failure_exit(vcpu, NULL, 0, ctxt->fetch.data,
8382 ctxt->fetch.end - ctxt->fetch.data);
8385 void __kvm_prepare_emulation_failure_exit(struct kvm_vcpu *vcpu, u64 *data,
8388 prepare_emulation_failure_exit(vcpu, data, ndata, NULL, 0);
8390 EXPORT_SYMBOL_GPL(__kvm_prepare_emulation_failure_exit);
8392 void kvm_prepare_emulation_failure_exit(struct kvm_vcpu *vcpu)
8394 __kvm_prepare_emulation_failure_exit(vcpu, NULL, 0);
8396 EXPORT_SYMBOL_GPL(kvm_prepare_emulation_failure_exit);
8398 static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type)
8400 struct kvm *kvm = vcpu->kvm;
8402 ++vcpu->stat.insn_emulation_fail;
8403 trace_kvm_emulate_insn_failed(vcpu);
8405 if (emulation_type & EMULTYPE_VMWARE_GP) {
8406 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
8410 if (kvm->arch.exit_on_emulation_error ||
8411 (emulation_type & EMULTYPE_SKIP)) {
8412 prepare_emulation_ctxt_failure_exit(vcpu);
8416 kvm_queue_exception(vcpu, UD_VECTOR);
8418 if (!is_guest_mode(vcpu) && static_call(kvm_x86_get_cpl)(vcpu) == 0) {
8419 prepare_emulation_ctxt_failure_exit(vcpu);
8426 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
8427 bool write_fault_to_shadow_pgtable,
8430 gpa_t gpa = cr2_or_gpa;
8433 if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
8436 if (WARN_ON_ONCE(is_guest_mode(vcpu)) ||
8437 WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF)))
8440 if (!vcpu->arch.mmu->root_role.direct) {
8442 * Write permission should be allowed since only
8443 * write access need to be emulated.
8445 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL);
8448 * If the mapping is invalid in guest, let cpu retry
8449 * it to generate fault.
8451 if (gpa == INVALID_GPA)
8456 * Do not retry the unhandleable instruction if it faults on the
8457 * readonly host memory, otherwise it will goto a infinite loop:
8458 * retry instruction -> write #PF -> emulation fail -> retry
8459 * instruction -> ...
8461 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
8464 * If the instruction failed on the error pfn, it can not be fixed,
8465 * report the error to userspace.
8467 if (is_error_noslot_pfn(pfn))
8470 kvm_release_pfn_clean(pfn);
8472 /* The instructions are well-emulated on direct mmu. */
8473 if (vcpu->arch.mmu->root_role.direct) {
8474 unsigned int indirect_shadow_pages;
8476 write_lock(&vcpu->kvm->mmu_lock);
8477 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
8478 write_unlock(&vcpu->kvm->mmu_lock);
8480 if (indirect_shadow_pages)
8481 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
8487 * if emulation was due to access to shadowed page table
8488 * and it failed try to unshadow page and re-enter the
8489 * guest to let CPU execute the instruction.
8491 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
8494 * If the access faults on its page table, it can not
8495 * be fixed by unprotecting shadow page and it should
8496 * be reported to userspace.
8498 return !write_fault_to_shadow_pgtable;
8501 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
8502 gpa_t cr2_or_gpa, int emulation_type)
8504 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8505 unsigned long last_retry_eip, last_retry_addr, gpa = cr2_or_gpa;
8507 last_retry_eip = vcpu->arch.last_retry_eip;
8508 last_retry_addr = vcpu->arch.last_retry_addr;
8511 * If the emulation is caused by #PF and it is non-page_table
8512 * writing instruction, it means the VM-EXIT is caused by shadow
8513 * page protected, we can zap the shadow page and retry this
8514 * instruction directly.
8516 * Note: if the guest uses a non-page-table modifying instruction
8517 * on the PDE that points to the instruction, then we will unmap
8518 * the instruction and go to an infinite loop. So, we cache the
8519 * last retried eip and the last fault address, if we meet the eip
8520 * and the address again, we can break out of the potential infinite
8523 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
8525 if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
8528 if (WARN_ON_ONCE(is_guest_mode(vcpu)) ||
8529 WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF)))
8532 if (x86_page_table_writing_insn(ctxt))
8535 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2_or_gpa)
8538 vcpu->arch.last_retry_eip = ctxt->eip;
8539 vcpu->arch.last_retry_addr = cr2_or_gpa;
8541 if (!vcpu->arch.mmu->root_role.direct)
8542 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL);
8544 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
8549 static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
8550 static int complete_emulated_pio(struct kvm_vcpu *vcpu);
8552 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
8561 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4)
8562 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr)
8567 static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu)
8569 struct kvm_run *kvm_run = vcpu->run;
8571 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
8572 kvm_run->debug.arch.dr6 = DR6_BS | DR6_ACTIVE_LOW;
8573 kvm_run->debug.arch.pc = kvm_get_linear_rip(vcpu);
8574 kvm_run->debug.arch.exception = DB_VECTOR;
8575 kvm_run->exit_reason = KVM_EXIT_DEBUG;
8578 kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS);
8582 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
8584 unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu);
8587 r = static_call(kvm_x86_skip_emulated_instruction)(vcpu);
8591 kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_INSTRUCTIONS);
8594 * rflags is the old, "raw" value of the flags. The new value has
8595 * not been saved yet.
8597 * This is correct even for TF set by the guest, because "the
8598 * processor will not generate this exception after the instruction
8599 * that sets the TF flag".
8601 if (unlikely(rflags & X86_EFLAGS_TF))
8602 r = kvm_vcpu_do_singlestep(vcpu);
8605 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction);
8607 static bool kvm_is_code_breakpoint_inhibited(struct kvm_vcpu *vcpu)
8611 if (kvm_get_rflags(vcpu) & X86_EFLAGS_RF)
8615 * Intel CPUs inhibit code #DBs when MOV/POP SS blocking is active,
8616 * but AMD CPUs do not. MOV/POP SS blocking is rare, check that first
8617 * to avoid the relatively expensive CPUID lookup.
8619 shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
8620 return (shadow & KVM_X86_SHADOW_INT_MOV_SS) &&
8621 guest_cpuid_is_intel(vcpu);
8624 static bool kvm_vcpu_check_code_breakpoint(struct kvm_vcpu *vcpu,
8625 int emulation_type, int *r)
8627 WARN_ON_ONCE(emulation_type & EMULTYPE_NO_DECODE);
8630 * Do not check for code breakpoints if hardware has already done the
8631 * checks, as inferred from the emulation type. On NO_DECODE and SKIP,
8632 * the instruction has passed all exception checks, and all intercepted
8633 * exceptions that trigger emulation have lower priority than code
8634 * breakpoints, i.e. the fact that the intercepted exception occurred
8635 * means any code breakpoints have already been serviced.
8637 * Note, KVM needs to check for code #DBs on EMULTYPE_TRAP_UD_FORCED as
8638 * hardware has checked the RIP of the magic prefix, but not the RIP of
8639 * the instruction being emulated. The intent of forced emulation is
8640 * to behave as if KVM intercepted the instruction without an exception
8641 * and without a prefix.
8643 if (emulation_type & (EMULTYPE_NO_DECODE | EMULTYPE_SKIP |
8644 EMULTYPE_TRAP_UD | EMULTYPE_VMWARE_GP | EMULTYPE_PF))
8647 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
8648 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) {
8649 struct kvm_run *kvm_run = vcpu->run;
8650 unsigned long eip = kvm_get_linear_rip(vcpu);
8651 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
8652 vcpu->arch.guest_debug_dr7,
8656 kvm_run->debug.arch.dr6 = dr6 | DR6_ACTIVE_LOW;
8657 kvm_run->debug.arch.pc = eip;
8658 kvm_run->debug.arch.exception = DB_VECTOR;
8659 kvm_run->exit_reason = KVM_EXIT_DEBUG;
8665 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) &&
8666 !kvm_is_code_breakpoint_inhibited(vcpu)) {
8667 unsigned long eip = kvm_get_linear_rip(vcpu);
8668 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
8673 kvm_queue_exception_p(vcpu, DB_VECTOR, dr6);
8682 static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt)
8684 switch (ctxt->opcode_len) {
8691 case 0xe6: /* OUT */
8695 case 0x6c: /* INS */
8697 case 0x6e: /* OUTS */
8704 case 0x33: /* RDPMC */
8714 * Decode an instruction for emulation. The caller is responsible for handling
8715 * code breakpoints. Note, manually detecting code breakpoints is unnecessary
8716 * (and wrong) when emulating on an intercepted fault-like exception[*], as
8717 * code breakpoints have higher priority and thus have already been done by
8720 * [*] Except #MC, which is higher priority, but KVM should never emulate in
8721 * response to a machine check.
8723 int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
8724 void *insn, int insn_len)
8726 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8729 init_emulate_ctxt(vcpu);
8731 r = x86_decode_insn(ctxt, insn, insn_len, emulation_type);
8733 trace_kvm_emulate_insn_start(vcpu);
8734 ++vcpu->stat.insn_emulation;
8738 EXPORT_SYMBOL_GPL(x86_decode_emulated_instruction);
8740 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
8741 int emulation_type, void *insn, int insn_len)
8744 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
8745 bool writeback = true;
8746 bool write_fault_to_spt;
8748 if (unlikely(!kvm_can_emulate_insn(vcpu, emulation_type, insn, insn_len)))
8751 vcpu->arch.l1tf_flush_l1d = true;
8754 * Clear write_fault_to_shadow_pgtable here to ensure it is
8757 write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
8758 vcpu->arch.write_fault_to_shadow_pgtable = false;
8760 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
8761 kvm_clear_exception_queue(vcpu);
8764 * Return immediately if RIP hits a code breakpoint, such #DBs
8765 * are fault-like and are higher priority than any faults on
8766 * the code fetch itself.
8768 if (kvm_vcpu_check_code_breakpoint(vcpu, emulation_type, &r))
8771 r = x86_decode_emulated_instruction(vcpu, emulation_type,
8773 if (r != EMULATION_OK) {
8774 if ((emulation_type & EMULTYPE_TRAP_UD) ||
8775 (emulation_type & EMULTYPE_TRAP_UD_FORCED)) {
8776 kvm_queue_exception(vcpu, UD_VECTOR);
8779 if (reexecute_instruction(vcpu, cr2_or_gpa,
8784 if (ctxt->have_exception &&
8785 !(emulation_type & EMULTYPE_SKIP)) {
8787 * #UD should result in just EMULATION_FAILED, and trap-like
8788 * exception should not be encountered during decode.
8790 WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR ||
8791 exception_type(ctxt->exception.vector) == EXCPT_TRAP);
8792 inject_emulated_exception(vcpu);
8795 return handle_emulation_failure(vcpu, emulation_type);
8799 if ((emulation_type & EMULTYPE_VMWARE_GP) &&
8800 !is_vmware_backdoor_opcode(ctxt)) {
8801 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
8806 * EMULTYPE_SKIP without EMULTYPE_COMPLETE_USER_EXIT is intended for
8807 * use *only* by vendor callbacks for kvm_skip_emulated_instruction().
8808 * The caller is responsible for updating interruptibility state and
8809 * injecting single-step #DBs.
8811 if (emulation_type & EMULTYPE_SKIP) {
8812 if (ctxt->mode != X86EMUL_MODE_PROT64)
8813 ctxt->eip = (u32)ctxt->_eip;
8815 ctxt->eip = ctxt->_eip;
8817 if (emulation_type & EMULTYPE_COMPLETE_USER_EXIT) {
8822 kvm_rip_write(vcpu, ctxt->eip);
8823 if (ctxt->eflags & X86_EFLAGS_RF)
8824 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
8828 if (retry_instruction(ctxt, cr2_or_gpa, emulation_type))
8831 /* this is needed for vmware backdoor interface to work since it
8832 changes registers values during IO operation */
8833 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
8834 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
8835 emulator_invalidate_register_cache(ctxt);
8839 if (emulation_type & EMULTYPE_PF) {
8840 /* Save the faulting GPA (cr2) in the address field */
8841 ctxt->exception.address = cr2_or_gpa;
8843 /* With shadow page tables, cr2 contains a GVA or nGPA. */
8844 if (vcpu->arch.mmu->root_role.direct) {
8845 ctxt->gpa_available = true;
8846 ctxt->gpa_val = cr2_or_gpa;
8849 /* Sanitize the address out of an abundance of paranoia. */
8850 ctxt->exception.address = 0;
8853 r = x86_emulate_insn(ctxt);
8855 if (r == EMULATION_INTERCEPTED)
8858 if (r == EMULATION_FAILED) {
8859 if (reexecute_instruction(vcpu, cr2_or_gpa, write_fault_to_spt,
8863 return handle_emulation_failure(vcpu, emulation_type);
8866 if (ctxt->have_exception) {
8868 inject_emulated_exception(vcpu);
8869 } else if (vcpu->arch.pio.count) {
8870 if (!vcpu->arch.pio.in) {
8871 /* FIXME: return into emulator if single-stepping. */
8872 vcpu->arch.pio.count = 0;
8875 vcpu->arch.complete_userspace_io = complete_emulated_pio;
8878 } else if (vcpu->mmio_needed) {
8879 ++vcpu->stat.mmio_exits;
8881 if (!vcpu->mmio_is_write)
8884 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
8885 } else if (vcpu->arch.complete_userspace_io) {
8888 } else if (r == EMULATION_RESTART)
8895 unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu);
8896 toggle_interruptibility(vcpu, ctxt->interruptibility);
8897 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
8900 * Note, EXCPT_DB is assumed to be fault-like as the emulator
8901 * only supports code breakpoints and general detect #DB, both
8902 * of which are fault-like.
8904 if (!ctxt->have_exception ||
8905 exception_type(ctxt->exception.vector) == EXCPT_TRAP) {
8906 kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_INSTRUCTIONS);
8907 if (ctxt->is_branch)
8908 kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
8909 kvm_rip_write(vcpu, ctxt->eip);
8910 if (r && (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)))
8911 r = kvm_vcpu_do_singlestep(vcpu);
8912 static_call_cond(kvm_x86_update_emulated_instruction)(vcpu);
8913 __kvm_set_rflags(vcpu, ctxt->eflags);
8917 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
8918 * do nothing, and it will be requested again as soon as
8919 * the shadow expires. But we still need to check here,
8920 * because POPF has no interrupt shadow.
8922 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF))
8923 kvm_make_request(KVM_REQ_EVENT, vcpu);
8925 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
8930 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type)
8932 return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0);
8934 EXPORT_SYMBOL_GPL(kvm_emulate_instruction);
8936 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
8937 void *insn, int insn_len)
8939 return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len);
8941 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer);
8943 static int complete_fast_pio_out_port_0x7e(struct kvm_vcpu *vcpu)
8945 vcpu->arch.pio.count = 0;
8949 static int complete_fast_pio_out(struct kvm_vcpu *vcpu)
8951 vcpu->arch.pio.count = 0;
8953 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip)))
8956 return kvm_skip_emulated_instruction(vcpu);
8959 static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size,
8960 unsigned short port)
8962 unsigned long val = kvm_rax_read(vcpu);
8963 int ret = emulator_pio_out(vcpu, size, port, &val, 1);
8969 * Workaround userspace that relies on old KVM behavior of %rip being
8970 * incremented prior to exiting to userspace to handle "OUT 0x7e".
8973 kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_OUT_7E_INC_RIP)) {
8974 vcpu->arch.complete_userspace_io =
8975 complete_fast_pio_out_port_0x7e;
8976 kvm_skip_emulated_instruction(vcpu);
8978 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
8979 vcpu->arch.complete_userspace_io = complete_fast_pio_out;
8984 static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
8988 /* We should only ever be called with arch.pio.count equal to 1 */
8989 BUG_ON(vcpu->arch.pio.count != 1);
8991 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) {
8992 vcpu->arch.pio.count = 0;
8996 /* For size less than 4 we merge, else we zero extend */
8997 val = (vcpu->arch.pio.size < 4) ? kvm_rax_read(vcpu) : 0;
8999 complete_emulator_pio_in(vcpu, &val);
9000 kvm_rax_write(vcpu, val);
9002 return kvm_skip_emulated_instruction(vcpu);
9005 static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
9006 unsigned short port)
9011 /* For size less than 4 we merge, else we zero extend */
9012 val = (size < 4) ? kvm_rax_read(vcpu) : 0;
9014 ret = emulator_pio_in(vcpu, size, port, &val, 1);
9016 kvm_rax_write(vcpu, val);
9020 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
9021 vcpu->arch.complete_userspace_io = complete_fast_pio_in;
9026 int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in)
9031 ret = kvm_fast_pio_in(vcpu, size, port);
9033 ret = kvm_fast_pio_out(vcpu, size, port);
9034 return ret && kvm_skip_emulated_instruction(vcpu);
9036 EXPORT_SYMBOL_GPL(kvm_fast_pio);
9038 static int kvmclock_cpu_down_prep(unsigned int cpu)
9040 __this_cpu_write(cpu_tsc_khz, 0);
9044 static void tsc_khz_changed(void *data)
9046 struct cpufreq_freqs *freq = data;
9047 unsigned long khz = 0;
9049 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_CONSTANT_TSC));
9054 khz = cpufreq_quick_get(raw_smp_processor_id());
9057 __this_cpu_write(cpu_tsc_khz, khz);
9060 #ifdef CONFIG_X86_64
9061 static void kvm_hyperv_tsc_notifier(void)
9066 mutex_lock(&kvm_lock);
9067 list_for_each_entry(kvm, &vm_list, vm_list)
9068 kvm_make_mclock_inprogress_request(kvm);
9070 /* no guest entries from this point */
9071 hyperv_stop_tsc_emulation();
9073 /* TSC frequency always matches when on Hyper-V */
9074 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
9075 for_each_present_cpu(cpu)
9076 per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
9078 kvm_caps.max_guest_tsc_khz = tsc_khz;
9080 list_for_each_entry(kvm, &vm_list, vm_list) {
9081 __kvm_start_pvclock_update(kvm);
9082 pvclock_update_vm_gtod_copy(kvm);
9083 kvm_end_pvclock_update(kvm);
9086 mutex_unlock(&kvm_lock);
9090 static void __kvmclock_cpufreq_notifier(struct cpufreq_freqs *freq, int cpu)
9093 struct kvm_vcpu *vcpu;
9098 * We allow guests to temporarily run on slowing clocks,
9099 * provided we notify them after, or to run on accelerating
9100 * clocks, provided we notify them before. Thus time never
9103 * However, we have a problem. We can't atomically update
9104 * the frequency of a given CPU from this function; it is
9105 * merely a notifier, which can be called from any CPU.
9106 * Changing the TSC frequency at arbitrary points in time
9107 * requires a recomputation of local variables related to
9108 * the TSC for each VCPU. We must flag these local variables
9109 * to be updated and be sure the update takes place with the
9110 * new frequency before any guests proceed.
9112 * Unfortunately, the combination of hotplug CPU and frequency
9113 * change creates an intractable locking scenario; the order
9114 * of when these callouts happen is undefined with respect to
9115 * CPU hotplug, and they can race with each other. As such,
9116 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
9117 * undefined; you can actually have a CPU frequency change take
9118 * place in between the computation of X and the setting of the
9119 * variable. To protect against this problem, all updates of
9120 * the per_cpu tsc_khz variable are done in an interrupt
9121 * protected IPI, and all callers wishing to update the value
9122 * must wait for a synchronous IPI to complete (which is trivial
9123 * if the caller is on the CPU already). This establishes the
9124 * necessary total order on variable updates.
9126 * Note that because a guest time update may take place
9127 * anytime after the setting of the VCPU's request bit, the
9128 * correct TSC value must be set before the request. However,
9129 * to ensure the update actually makes it to any guest which
9130 * starts running in hardware virtualization between the set
9131 * and the acquisition of the spinlock, we must also ping the
9132 * CPU after setting the request bit.
9136 smp_call_function_single(cpu, tsc_khz_changed, freq, 1);
9138 mutex_lock(&kvm_lock);
9139 list_for_each_entry(kvm, &vm_list, vm_list) {
9140 kvm_for_each_vcpu(i, vcpu, kvm) {
9141 if (vcpu->cpu != cpu)
9143 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
9144 if (vcpu->cpu != raw_smp_processor_id())
9148 mutex_unlock(&kvm_lock);
9150 if (freq->old < freq->new && send_ipi) {
9152 * We upscale the frequency. Must make the guest
9153 * doesn't see old kvmclock values while running with
9154 * the new frequency, otherwise we risk the guest sees
9155 * time go backwards.
9157 * In case we update the frequency for another cpu
9158 * (which might be in guest context) send an interrupt
9159 * to kick the cpu out of guest context. Next time
9160 * guest context is entered kvmclock will be updated,
9161 * so the guest will not see stale values.
9163 smp_call_function_single(cpu, tsc_khz_changed, freq, 1);
9167 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
9170 struct cpufreq_freqs *freq = data;
9173 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
9175 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
9178 for_each_cpu(cpu, freq->policy->cpus)
9179 __kvmclock_cpufreq_notifier(freq, cpu);
9184 static struct notifier_block kvmclock_cpufreq_notifier_block = {
9185 .notifier_call = kvmclock_cpufreq_notifier
9188 static int kvmclock_cpu_online(unsigned int cpu)
9190 tsc_khz_changed(NULL);
9194 static void kvm_timer_init(void)
9196 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
9197 max_tsc_khz = tsc_khz;
9199 if (IS_ENABLED(CONFIG_CPU_FREQ)) {
9200 struct cpufreq_policy *policy;
9204 policy = cpufreq_cpu_get(cpu);
9206 if (policy->cpuinfo.max_freq)
9207 max_tsc_khz = policy->cpuinfo.max_freq;
9208 cpufreq_cpu_put(policy);
9212 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
9213 CPUFREQ_TRANSITION_NOTIFIER);
9215 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online",
9216 kvmclock_cpu_online, kvmclock_cpu_down_prep);
9220 #ifdef CONFIG_X86_64
9221 static void pvclock_gtod_update_fn(struct work_struct *work)
9224 struct kvm_vcpu *vcpu;
9227 mutex_lock(&kvm_lock);
9228 list_for_each_entry(kvm, &vm_list, vm_list)
9229 kvm_for_each_vcpu(i, vcpu, kvm)
9230 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
9231 atomic_set(&kvm_guest_has_master_clock, 0);
9232 mutex_unlock(&kvm_lock);
9235 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn);
9238 * Indirection to move queue_work() out of the tk_core.seq write held
9239 * region to prevent possible deadlocks against time accessors which
9240 * are invoked with work related locks held.
9242 static void pvclock_irq_work_fn(struct irq_work *w)
9244 queue_work(system_long_wq, &pvclock_gtod_work);
9247 static DEFINE_IRQ_WORK(pvclock_irq_work, pvclock_irq_work_fn);
9250 * Notification about pvclock gtod data update.
9252 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused,
9255 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
9256 struct timekeeper *tk = priv;
9258 update_pvclock_gtod(tk);
9261 * Disable master clock if host does not trust, or does not use,
9262 * TSC based clocksource. Delegate queue_work() to irq_work as
9263 * this is invoked with tk_core.seq write held.
9265 if (!gtod_is_based_on_tsc(gtod->clock.vclock_mode) &&
9266 atomic_read(&kvm_guest_has_master_clock) != 0)
9267 irq_work_queue(&pvclock_irq_work);
9271 static struct notifier_block pvclock_gtod_notifier = {
9272 .notifier_call = pvclock_gtod_notify,
9276 int kvm_arch_init(void *opaque)
9278 struct kvm_x86_init_ops *ops = opaque;
9282 if (kvm_x86_ops.hardware_enable) {
9283 pr_err("kvm: already loaded vendor module '%s'\n", kvm_x86_ops.name);
9287 if (!ops->cpu_has_kvm_support()) {
9288 pr_err_ratelimited("kvm: no hardware support for '%s'\n",
9289 ops->runtime_ops->name);
9292 if (ops->disabled_by_bios()) {
9293 pr_err_ratelimited("kvm: support for '%s' disabled by bios\n",
9294 ops->runtime_ops->name);
9299 * KVM explicitly assumes that the guest has an FPU and
9300 * FXSAVE/FXRSTOR. For example, the KVM_GET_FPU explicitly casts the
9301 * vCPU's FPU state as a fxregs_state struct.
9303 if (!boot_cpu_has(X86_FEATURE_FPU) || !boot_cpu_has(X86_FEATURE_FXSR)) {
9304 printk(KERN_ERR "kvm: inadequate fpu\n");
9308 if (IS_ENABLED(CONFIG_PREEMPT_RT) && !boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
9309 pr_err("RT requires X86_FEATURE_CONSTANT_TSC\n");
9314 * KVM assumes that PAT entry '0' encodes WB memtype and simply zeroes
9315 * the PAT bits in SPTEs. Bail if PAT[0] is programmed to something
9316 * other than WB. Note, EPT doesn't utilize the PAT, but don't bother
9317 * with an exception. PAT[0] is set to WB on RESET and also by the
9318 * kernel, i.e. failure indicates a kernel bug or broken firmware.
9320 if (rdmsrl_safe(MSR_IA32_CR_PAT, &host_pat) ||
9321 (host_pat & GENMASK(2, 0)) != 6) {
9322 pr_err("kvm: host PAT[0] is not WB\n");
9326 x86_emulator_cache = kvm_alloc_emulator_cache();
9327 if (!x86_emulator_cache) {
9328 pr_err("kvm: failed to allocate cache for x86 emulator\n");
9332 user_return_msrs = alloc_percpu(struct kvm_user_return_msrs);
9333 if (!user_return_msrs) {
9334 printk(KERN_ERR "kvm: failed to allocate percpu kvm_user_return_msrs\n");
9336 goto out_free_x86_emulator_cache;
9338 kvm_nr_uret_msrs = 0;
9340 r = kvm_mmu_vendor_module_init();
9342 goto out_free_percpu;
9346 if (boot_cpu_has(X86_FEATURE_XSAVE)) {
9347 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
9348 kvm_caps.supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0;
9351 if (pi_inject_timer == -1)
9352 pi_inject_timer = housekeeping_enabled(HK_TYPE_TIMER);
9353 #ifdef CONFIG_X86_64
9354 pvclock_gtod_register_notifier(&pvclock_gtod_notifier);
9356 if (hypervisor_is_type(X86_HYPER_MS_HYPERV))
9357 set_hv_tscchange_cb(kvm_hyperv_tsc_notifier);
9363 free_percpu(user_return_msrs);
9364 out_free_x86_emulator_cache:
9365 kmem_cache_destroy(x86_emulator_cache);
9369 void kvm_arch_exit(void)
9371 #ifdef CONFIG_X86_64
9372 if (hypervisor_is_type(X86_HYPER_MS_HYPERV))
9373 clear_hv_tscchange_cb();
9377 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
9378 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
9379 CPUFREQ_TRANSITION_NOTIFIER);
9380 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE);
9382 #ifdef CONFIG_X86_64
9383 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier);
9384 irq_work_sync(&pvclock_irq_work);
9385 cancel_work_sync(&pvclock_gtod_work);
9387 kvm_x86_ops.hardware_enable = NULL;
9388 kvm_mmu_vendor_module_exit();
9389 free_percpu(user_return_msrs);
9390 kmem_cache_destroy(x86_emulator_cache);
9391 #ifdef CONFIG_KVM_XEN
9392 static_key_deferred_flush(&kvm_xen_enabled);
9393 WARN_ON(static_branch_unlikely(&kvm_xen_enabled.key));
9397 static int __kvm_emulate_halt(struct kvm_vcpu *vcpu, int state, int reason)
9400 * The vCPU has halted, e.g. executed HLT. Update the run state if the
9401 * local APIC is in-kernel, the run loop will detect the non-runnable
9402 * state and halt the vCPU. Exit to userspace if the local APIC is
9403 * managed by userspace, in which case userspace is responsible for
9404 * handling wake events.
9406 ++vcpu->stat.halt_exits;
9407 if (lapic_in_kernel(vcpu)) {
9408 vcpu->arch.mp_state = state;
9411 vcpu->run->exit_reason = reason;
9416 int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu)
9418 return __kvm_emulate_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT);
9420 EXPORT_SYMBOL_GPL(kvm_emulate_halt_noskip);
9422 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
9424 int ret = kvm_skip_emulated_instruction(vcpu);
9426 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered
9427 * KVM_EXIT_DEBUG here.
9429 return kvm_emulate_halt_noskip(vcpu) && ret;
9431 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
9433 int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu)
9435 int ret = kvm_skip_emulated_instruction(vcpu);
9437 return __kvm_emulate_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD,
9438 KVM_EXIT_AP_RESET_HOLD) && ret;
9440 EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold);
9442 #ifdef CONFIG_X86_64
9443 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
9444 unsigned long clock_type)
9446 struct kvm_clock_pairing clock_pairing;
9447 struct timespec64 ts;
9451 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK)
9452 return -KVM_EOPNOTSUPP;
9455 * When tsc is in permanent catchup mode guests won't be able to use
9456 * pvclock_read_retry loop to get consistent view of pvclock
9458 if (vcpu->arch.tsc_always_catchup)
9459 return -KVM_EOPNOTSUPP;
9461 if (!kvm_get_walltime_and_clockread(&ts, &cycle))
9462 return -KVM_EOPNOTSUPP;
9464 clock_pairing.sec = ts.tv_sec;
9465 clock_pairing.nsec = ts.tv_nsec;
9466 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle);
9467 clock_pairing.flags = 0;
9468 memset(&clock_pairing.pad, 0, sizeof(clock_pairing.pad));
9471 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing,
9472 sizeof(struct kvm_clock_pairing)))
9480 * kvm_pv_kick_cpu_op: Kick a vcpu.
9482 * @apicid - apicid of vcpu to be kicked.
9484 static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid)
9487 * All other fields are unused for APIC_DM_REMRD, but may be consumed by
9488 * common code, e.g. for tracing. Defer initialization to the compiler.
9490 struct kvm_lapic_irq lapic_irq = {
9491 .delivery_mode = APIC_DM_REMRD,
9492 .dest_mode = APIC_DEST_PHYSICAL,
9493 .shorthand = APIC_DEST_NOSHORT,
9497 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
9500 bool kvm_apicv_activated(struct kvm *kvm)
9502 return (READ_ONCE(kvm->arch.apicv_inhibit_reasons) == 0);
9504 EXPORT_SYMBOL_GPL(kvm_apicv_activated);
9506 bool kvm_vcpu_apicv_activated(struct kvm_vcpu *vcpu)
9508 ulong vm_reasons = READ_ONCE(vcpu->kvm->arch.apicv_inhibit_reasons);
9509 ulong vcpu_reasons = static_call(kvm_x86_vcpu_get_apicv_inhibit_reasons)(vcpu);
9511 return (vm_reasons | vcpu_reasons) == 0;
9513 EXPORT_SYMBOL_GPL(kvm_vcpu_apicv_activated);
9515 static void set_or_clear_apicv_inhibit(unsigned long *inhibits,
9516 enum kvm_apicv_inhibit reason, bool set)
9519 __set_bit(reason, inhibits);
9521 __clear_bit(reason, inhibits);
9523 trace_kvm_apicv_inhibit_changed(reason, set, *inhibits);
9526 static void kvm_apicv_init(struct kvm *kvm)
9528 unsigned long *inhibits = &kvm->arch.apicv_inhibit_reasons;
9530 init_rwsem(&kvm->arch.apicv_update_lock);
9532 set_or_clear_apicv_inhibit(inhibits, APICV_INHIBIT_REASON_ABSENT, true);
9535 set_or_clear_apicv_inhibit(inhibits,
9536 APICV_INHIBIT_REASON_DISABLE, true);
9539 static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
9541 struct kvm_vcpu *target = NULL;
9542 struct kvm_apic_map *map;
9544 vcpu->stat.directed_yield_attempted++;
9546 if (single_task_running())
9550 map = rcu_dereference(vcpu->kvm->arch.apic_map);
9552 if (likely(map) && dest_id <= map->max_apic_id && map->phys_map[dest_id])
9553 target = map->phys_map[dest_id]->vcpu;
9557 if (!target || !READ_ONCE(target->ready))
9560 /* Ignore requests to yield to self */
9564 if (kvm_vcpu_yield_to(target) <= 0)
9567 vcpu->stat.directed_yield_successful++;
9573 static int complete_hypercall_exit(struct kvm_vcpu *vcpu)
9575 u64 ret = vcpu->run->hypercall.ret;
9577 if (!is_64_bit_mode(vcpu))
9579 kvm_rax_write(vcpu, ret);
9580 ++vcpu->stat.hypercalls;
9581 return kvm_skip_emulated_instruction(vcpu);
9584 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
9586 unsigned long nr, a0, a1, a2, a3, ret;
9589 if (kvm_xen_hypercall_enabled(vcpu->kvm))
9590 return kvm_xen_hypercall(vcpu);
9592 if (kvm_hv_hypercall_enabled(vcpu))
9593 return kvm_hv_hypercall(vcpu);
9595 nr = kvm_rax_read(vcpu);
9596 a0 = kvm_rbx_read(vcpu);
9597 a1 = kvm_rcx_read(vcpu);
9598 a2 = kvm_rdx_read(vcpu);
9599 a3 = kvm_rsi_read(vcpu);
9601 trace_kvm_hypercall(nr, a0, a1, a2, a3);
9603 op_64_bit = is_64_bit_hypercall(vcpu);
9612 if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
9620 case KVM_HC_VAPIC_POLL_IRQ:
9623 case KVM_HC_KICK_CPU:
9624 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_UNHALT))
9627 kvm_pv_kick_cpu_op(vcpu->kvm, a1);
9628 kvm_sched_yield(vcpu, a1);
9631 #ifdef CONFIG_X86_64
9632 case KVM_HC_CLOCK_PAIRING:
9633 ret = kvm_pv_clock_pairing(vcpu, a0, a1);
9636 case KVM_HC_SEND_IPI:
9637 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SEND_IPI))
9640 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit);
9642 case KVM_HC_SCHED_YIELD:
9643 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SCHED_YIELD))
9646 kvm_sched_yield(vcpu, a0);
9649 case KVM_HC_MAP_GPA_RANGE: {
9650 u64 gpa = a0, npages = a1, attrs = a2;
9653 if (!(vcpu->kvm->arch.hypercall_exit_enabled & (1 << KVM_HC_MAP_GPA_RANGE)))
9656 if (!PAGE_ALIGNED(gpa) || !npages ||
9657 gpa_to_gfn(gpa) + npages <= gpa_to_gfn(gpa)) {
9662 vcpu->run->exit_reason = KVM_EXIT_HYPERCALL;
9663 vcpu->run->hypercall.nr = KVM_HC_MAP_GPA_RANGE;
9664 vcpu->run->hypercall.args[0] = gpa;
9665 vcpu->run->hypercall.args[1] = npages;
9666 vcpu->run->hypercall.args[2] = attrs;
9667 vcpu->run->hypercall.longmode = op_64_bit;
9668 vcpu->arch.complete_userspace_io = complete_hypercall_exit;
9678 kvm_rax_write(vcpu, ret);
9680 ++vcpu->stat.hypercalls;
9681 return kvm_skip_emulated_instruction(vcpu);
9683 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
9685 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
9687 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
9688 char instruction[3];
9689 unsigned long rip = kvm_rip_read(vcpu);
9692 * If the quirk is disabled, synthesize a #UD and let the guest pick up
9695 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_FIX_HYPERCALL_INSN)) {
9696 ctxt->exception.error_code_valid = false;
9697 ctxt->exception.vector = UD_VECTOR;
9698 ctxt->have_exception = true;
9699 return X86EMUL_PROPAGATE_FAULT;
9702 static_call(kvm_x86_patch_hypercall)(vcpu, instruction);
9704 return emulator_write_emulated(ctxt, rip, instruction, 3,
9708 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
9710 return vcpu->run->request_interrupt_window &&
9711 likely(!pic_in_kernel(vcpu->kvm));
9714 /* Called within kvm->srcu read side. */
9715 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
9717 struct kvm_run *kvm_run = vcpu->run;
9719 kvm_run->if_flag = static_call(kvm_x86_get_if_flag)(vcpu);
9720 kvm_run->cr8 = kvm_get_cr8(vcpu);
9721 kvm_run->apic_base = kvm_get_apic_base(vcpu);
9723 kvm_run->ready_for_interrupt_injection =
9724 pic_in_kernel(vcpu->kvm) ||
9725 kvm_vcpu_ready_for_interrupt_injection(vcpu);
9728 kvm_run->flags |= KVM_RUN_X86_SMM;
9731 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
9735 if (!kvm_x86_ops.update_cr8_intercept)
9738 if (!lapic_in_kernel(vcpu))
9741 if (vcpu->arch.apic->apicv_active)
9744 if (!vcpu->arch.apic->vapic_addr)
9745 max_irr = kvm_lapic_find_highest_irr(vcpu);
9752 tpr = kvm_lapic_get_cr8(vcpu);
9754 static_call(kvm_x86_update_cr8_intercept)(vcpu, tpr, max_irr);
9758 int kvm_check_nested_events(struct kvm_vcpu *vcpu)
9760 if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
9761 kvm_x86_ops.nested_ops->triple_fault(vcpu);
9765 return kvm_x86_ops.nested_ops->check_events(vcpu);
9768 static void kvm_inject_exception(struct kvm_vcpu *vcpu)
9770 trace_kvm_inj_exception(vcpu->arch.exception.vector,
9771 vcpu->arch.exception.has_error_code,
9772 vcpu->arch.exception.error_code,
9773 vcpu->arch.exception.injected);
9775 if (vcpu->arch.exception.error_code && !is_protmode(vcpu))
9776 vcpu->arch.exception.error_code = false;
9777 static_call(kvm_x86_inject_exception)(vcpu);
9781 * Check for any event (interrupt or exception) that is ready to be injected,
9782 * and if there is at least one event, inject the event with the highest
9783 * priority. This handles both "pending" events, i.e. events that have never
9784 * been injected into the guest, and "injected" events, i.e. events that were
9785 * injected as part of a previous VM-Enter, but weren't successfully delivered
9786 * and need to be re-injected.
9788 * Note, this is not guaranteed to be invoked on a guest instruction boundary,
9789 * i.e. doesn't guarantee that there's an event window in the guest. KVM must
9790 * be able to inject exceptions in the "middle" of an instruction, and so must
9791 * also be able to re-inject NMIs and IRQs in the middle of an instruction.
9792 * I.e. for exceptions and re-injected events, NOT invoking this on instruction
9793 * boundaries is necessary and correct.
9795 * For simplicity, KVM uses a single path to inject all events (except events
9796 * that are injected directly from L1 to L2) and doesn't explicitly track
9797 * instruction boundaries for asynchronous events. However, because VM-Exits
9798 * that can occur during instruction execution typically result in KVM skipping
9799 * the instruction or injecting an exception, e.g. instruction and exception
9800 * intercepts, and because pending exceptions have higher priority than pending
9801 * interrupts, KVM still honors instruction boundaries in most scenarios.
9803 * But, if a VM-Exit occurs during instruction execution, and KVM does NOT skip
9804 * the instruction or inject an exception, then KVM can incorrecty inject a new
9805 * asynchrounous event if the event became pending after the CPU fetched the
9806 * instruction (in the guest). E.g. if a page fault (#PF, #NPF, EPT violation)
9807 * occurs and is resolved by KVM, a coincident NMI, SMI, IRQ, etc... can be
9808 * injected on the restarted instruction instead of being deferred until the
9809 * instruction completes.
9811 * In practice, this virtualization hole is unlikely to be observed by the
9812 * guest, and even less likely to cause functional problems. To detect the
9813 * hole, the guest would have to trigger an event on a side effect of an early
9814 * phase of instruction execution, e.g. on the instruction fetch from memory.
9815 * And for it to be a functional problem, the guest would need to depend on the
9816 * ordering between that side effect, the instruction completing, _and_ the
9817 * delivery of the asynchronous event.
9819 static int kvm_check_and_inject_events(struct kvm_vcpu *vcpu,
9820 bool *req_immediate_exit)
9826 * Process nested events first, as nested VM-Exit supercedes event
9827 * re-injection. If there's an event queued for re-injection, it will
9828 * be saved into the appropriate vmc{b,s}12 fields on nested VM-Exit.
9830 if (is_guest_mode(vcpu))
9831 r = kvm_check_nested_events(vcpu);
9836 * Re-inject exceptions and events *especially* if immediate entry+exit
9837 * to/from L2 is needed, as any event that has already been injected
9838 * into L2 needs to complete its lifecycle before injecting a new event.
9840 * Don't re-inject an NMI or interrupt if there is a pending exception.
9841 * This collision arises if an exception occurred while vectoring the
9842 * injected event, KVM intercepted said exception, and KVM ultimately
9843 * determined the fault belongs to the guest and queues the exception
9844 * for injection back into the guest.
9846 * "Injected" interrupts can also collide with pending exceptions if
9847 * userspace ignores the "ready for injection" flag and blindly queues
9848 * an interrupt. In that case, prioritizing the exception is correct,
9849 * as the exception "occurred" before the exit to userspace. Trap-like
9850 * exceptions, e.g. most #DBs, have higher priority than interrupts.
9851 * And while fault-like exceptions, e.g. #GP and #PF, are the lowest
9852 * priority, they're only generated (pended) during instruction
9853 * execution, and interrupts are recognized at instruction boundaries.
9854 * Thus a pending fault-like exception means the fault occurred on the
9855 * *previous* instruction and must be serviced prior to recognizing any
9856 * new events in order to fully complete the previous instruction.
9858 if (vcpu->arch.exception.injected)
9859 kvm_inject_exception(vcpu);
9860 else if (kvm_is_exception_pending(vcpu))
9862 else if (vcpu->arch.nmi_injected)
9863 static_call(kvm_x86_inject_nmi)(vcpu);
9864 else if (vcpu->arch.interrupt.injected)
9865 static_call(kvm_x86_inject_irq)(vcpu, true);
9868 * Exceptions that morph to VM-Exits are handled above, and pending
9869 * exceptions on top of injected exceptions that do not VM-Exit should
9870 * either morph to #DF or, sadly, override the injected exception.
9872 WARN_ON_ONCE(vcpu->arch.exception.injected &&
9873 vcpu->arch.exception.pending);
9876 * Bail if immediate entry+exit to/from the guest is needed to complete
9877 * nested VM-Enter or event re-injection so that a different pending
9878 * event can be serviced (or if KVM needs to exit to userspace).
9880 * Otherwise, continue processing events even if VM-Exit occurred. The
9881 * VM-Exit will have cleared exceptions that were meant for L2, but
9882 * there may now be events that can be injected into L1.
9888 * A pending exception VM-Exit should either result in nested VM-Exit
9889 * or force an immediate re-entry and exit to/from L2, and exception
9890 * VM-Exits cannot be injected (flag should _never_ be set).
9892 WARN_ON_ONCE(vcpu->arch.exception_vmexit.injected ||
9893 vcpu->arch.exception_vmexit.pending);
9896 * New events, other than exceptions, cannot be injected if KVM needs
9897 * to re-inject a previous event. See above comments on re-injecting
9898 * for why pending exceptions get priority.
9900 can_inject = !kvm_event_needs_reinjection(vcpu);
9902 if (vcpu->arch.exception.pending) {
9904 * Fault-class exceptions, except #DBs, set RF=1 in the RFLAGS
9905 * value pushed on the stack. Trap-like exception and all #DBs
9906 * leave RF as-is (KVM follows Intel's behavior in this regard;
9907 * AMD states that code breakpoint #DBs excplitly clear RF=0).
9909 * Note, most versions of Intel's SDM and AMD's APM incorrectly
9910 * describe the behavior of General Detect #DBs, which are
9911 * fault-like. They do _not_ set RF, a la code breakpoints.
9913 if (exception_type(vcpu->arch.exception.vector) == EXCPT_FAULT)
9914 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
9917 if (vcpu->arch.exception.vector == DB_VECTOR) {
9918 kvm_deliver_exception_payload(vcpu, &vcpu->arch.exception);
9919 if (vcpu->arch.dr7 & DR7_GD) {
9920 vcpu->arch.dr7 &= ~DR7_GD;
9921 kvm_update_dr7(vcpu);
9925 kvm_inject_exception(vcpu);
9927 vcpu->arch.exception.pending = false;
9928 vcpu->arch.exception.injected = true;
9933 /* Don't inject interrupts if the user asked to avoid doing so */
9934 if (vcpu->guest_debug & KVM_GUESTDBG_BLOCKIRQ)
9938 * Finally, inject interrupt events. If an event cannot be injected
9939 * due to architectural conditions (e.g. IF=0) a window-open exit
9940 * will re-request KVM_REQ_EVENT. Sometimes however an event is pending
9941 * and can architecturally be injected, but we cannot do it right now:
9942 * an interrupt could have arrived just now and we have to inject it
9943 * as a vmexit, or there could already an event in the queue, which is
9944 * indicated by can_inject. In that case we request an immediate exit
9945 * in order to make progress and get back here for another iteration.
9946 * The kvm_x86_ops hooks communicate this by returning -EBUSY.
9948 #ifdef CONFIG_KVM_SMM
9949 if (vcpu->arch.smi_pending) {
9950 r = can_inject ? static_call(kvm_x86_smi_allowed)(vcpu, true) : -EBUSY;
9954 vcpu->arch.smi_pending = false;
9955 ++vcpu->arch.smi_count;
9959 static_call(kvm_x86_enable_smi_window)(vcpu);
9963 if (vcpu->arch.nmi_pending) {
9964 r = can_inject ? static_call(kvm_x86_nmi_allowed)(vcpu, true) : -EBUSY;
9968 --vcpu->arch.nmi_pending;
9969 vcpu->arch.nmi_injected = true;
9970 static_call(kvm_x86_inject_nmi)(vcpu);
9972 WARN_ON(static_call(kvm_x86_nmi_allowed)(vcpu, true) < 0);
9974 if (vcpu->arch.nmi_pending)
9975 static_call(kvm_x86_enable_nmi_window)(vcpu);
9978 if (kvm_cpu_has_injectable_intr(vcpu)) {
9979 r = can_inject ? static_call(kvm_x86_interrupt_allowed)(vcpu, true) : -EBUSY;
9983 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), false);
9984 static_call(kvm_x86_inject_irq)(vcpu, false);
9985 WARN_ON(static_call(kvm_x86_interrupt_allowed)(vcpu, true) < 0);
9987 if (kvm_cpu_has_injectable_intr(vcpu))
9988 static_call(kvm_x86_enable_irq_window)(vcpu);
9991 if (is_guest_mode(vcpu) &&
9992 kvm_x86_ops.nested_ops->has_events &&
9993 kvm_x86_ops.nested_ops->has_events(vcpu))
9994 *req_immediate_exit = true;
9997 * KVM must never queue a new exception while injecting an event; KVM
9998 * is done emulating and should only propagate the to-be-injected event
9999 * to the VMCS/VMCB. Queueing a new exception can put the vCPU into an
10000 * infinite loop as KVM will bail from VM-Enter to inject the pending
10001 * exception and start the cycle all over.
10003 * Exempt triple faults as they have special handling and won't put the
10004 * vCPU into an infinite loop. Triple fault can be queued when running
10005 * VMX without unrestricted guest, as that requires KVM to emulate Real
10006 * Mode events (see kvm_inject_realmode_interrupt()).
10008 WARN_ON_ONCE(vcpu->arch.exception.pending ||
10009 vcpu->arch.exception_vmexit.pending);
10014 *req_immediate_exit = true;
10020 static void process_nmi(struct kvm_vcpu *vcpu)
10022 unsigned limit = 2;
10025 * x86 is limited to one NMI running, and one NMI pending after it.
10026 * If an NMI is already in progress, limit further NMIs to just one.
10027 * Otherwise, allow two (and we'll inject the first one immediately).
10029 if (static_call(kvm_x86_get_nmi_mask)(vcpu) || vcpu->arch.nmi_injected)
10032 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
10033 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
10034 kvm_make_request(KVM_REQ_EVENT, vcpu);
10037 void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
10038 unsigned long *vcpu_bitmap)
10040 kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC, vcpu_bitmap);
10043 void kvm_make_scan_ioapic_request(struct kvm *kvm)
10045 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
10048 void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
10050 struct kvm_lapic *apic = vcpu->arch.apic;
10053 if (!lapic_in_kernel(vcpu))
10056 down_read(&vcpu->kvm->arch.apicv_update_lock);
10059 /* Do not activate APICV when APIC is disabled */
10060 activate = kvm_vcpu_apicv_activated(vcpu) &&
10061 (kvm_get_apic_mode(vcpu) != LAPIC_MODE_DISABLED);
10063 if (apic->apicv_active == activate)
10066 apic->apicv_active = activate;
10067 kvm_apic_update_apicv(vcpu);
10068 static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);
10071 * When APICv gets disabled, we may still have injected interrupts
10072 * pending. At the same time, KVM_REQ_EVENT may not be set as APICv was
10073 * still active when the interrupt got accepted. Make sure
10074 * kvm_check_and_inject_events() is called to check for that.
10076 if (!apic->apicv_active)
10077 kvm_make_request(KVM_REQ_EVENT, vcpu);
10081 up_read(&vcpu->kvm->arch.apicv_update_lock);
10083 EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
10085 void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
10086 enum kvm_apicv_inhibit reason, bool set)
10088 unsigned long old, new;
10090 lockdep_assert_held_write(&kvm->arch.apicv_update_lock);
10092 if (!static_call(kvm_x86_check_apicv_inhibit_reasons)(reason))
10095 old = new = kvm->arch.apicv_inhibit_reasons;
10097 set_or_clear_apicv_inhibit(&new, reason, set);
10099 if (!!old != !!new) {
10101 * Kick all vCPUs before setting apicv_inhibit_reasons to avoid
10102 * false positives in the sanity check WARN in svm_vcpu_run().
10103 * This task will wait for all vCPUs to ack the kick IRQ before
10104 * updating apicv_inhibit_reasons, and all other vCPUs will
10105 * block on acquiring apicv_update_lock so that vCPUs can't
10106 * redo svm_vcpu_run() without seeing the new inhibit state.
10108 * Note, holding apicv_update_lock and taking it in the read
10109 * side (handling the request) also prevents other vCPUs from
10110 * servicing the request with a stale apicv_inhibit_reasons.
10112 kvm_make_all_cpus_request(kvm, KVM_REQ_APICV_UPDATE);
10113 kvm->arch.apicv_inhibit_reasons = new;
10115 unsigned long gfn = gpa_to_gfn(APIC_DEFAULT_PHYS_BASE);
10116 int idx = srcu_read_lock(&kvm->srcu);
10118 kvm_zap_gfn_range(kvm, gfn, gfn+1);
10119 srcu_read_unlock(&kvm->srcu, idx);
10122 kvm->arch.apicv_inhibit_reasons = new;
10126 void kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
10127 enum kvm_apicv_inhibit reason, bool set)
10132 down_write(&kvm->arch.apicv_update_lock);
10133 __kvm_set_or_clear_apicv_inhibit(kvm, reason, set);
10134 up_write(&kvm->arch.apicv_update_lock);
10136 EXPORT_SYMBOL_GPL(kvm_set_or_clear_apicv_inhibit);
10138 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
10140 if (!kvm_apic_present(vcpu))
10143 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256);
10145 if (irqchip_split(vcpu->kvm))
10146 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors);
10148 static_call_cond(kvm_x86_sync_pir_to_irr)(vcpu);
10149 if (ioapic_in_kernel(vcpu->kvm))
10150 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
10153 if (is_guest_mode(vcpu))
10154 vcpu->arch.load_eoi_exitmap_pending = true;
10156 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
10159 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu)
10161 u64 eoi_exit_bitmap[4];
10163 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
10166 if (to_hv_vcpu(vcpu)) {
10167 bitmap_or((ulong *)eoi_exit_bitmap,
10168 vcpu->arch.ioapic_handled_vectors,
10169 to_hv_synic(vcpu)->vec_bitmap, 256);
10170 static_call_cond(kvm_x86_load_eoi_exitmap)(vcpu, eoi_exit_bitmap);
10174 static_call_cond(kvm_x86_load_eoi_exitmap)(
10175 vcpu, (u64 *)vcpu->arch.ioapic_handled_vectors);
10178 void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
10179 unsigned long start, unsigned long end)
10181 unsigned long apic_address;
10184 * The physical address of apic access page is stored in the VMCS.
10185 * Update it when it becomes invalid.
10187 apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
10188 if (start <= apic_address && apic_address < end)
10189 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
10192 void kvm_arch_guest_memory_reclaimed(struct kvm *kvm)
10194 static_call_cond(kvm_x86_guest_memory_reclaimed)(kvm);
10197 static void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
10199 if (!lapic_in_kernel(vcpu))
10202 static_call_cond(kvm_x86_set_apic_access_page_addr)(vcpu);
10205 void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu)
10207 smp_send_reschedule(vcpu->cpu);
10209 EXPORT_SYMBOL_GPL(__kvm_request_immediate_exit);
10212 * Called within kvm->srcu read side.
10213 * Returns 1 to let vcpu_run() continue the guest execution loop without
10214 * exiting to the userspace. Otherwise, the value will be returned to the
10217 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
10221 dm_request_for_irq_injection(vcpu) &&
10222 kvm_cpu_accept_dm_intr(vcpu);
10223 fastpath_t exit_fastpath;
10225 bool req_immediate_exit = false;
10227 if (kvm_request_pending(vcpu)) {
10228 if (kvm_check_request(KVM_REQ_VM_DEAD, vcpu)) {
10233 if (kvm_dirty_ring_check_request(vcpu)) {
10238 if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
10239 if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) {
10244 if (kvm_check_request(KVM_REQ_MMU_FREE_OBSOLETE_ROOTS, vcpu))
10245 kvm_mmu_free_obsolete_roots(vcpu);
10246 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
10247 __kvm_migrate_timers(vcpu);
10248 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
10249 kvm_update_masterclock(vcpu->kvm);
10250 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
10251 kvm_gen_kvmclock_update(vcpu);
10252 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
10253 r = kvm_guest_time_update(vcpu);
10257 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
10258 kvm_mmu_sync_roots(vcpu);
10259 if (kvm_check_request(KVM_REQ_LOAD_MMU_PGD, vcpu))
10260 kvm_mmu_load_pgd(vcpu);
10263 * Note, the order matters here, as flushing "all" TLB entries
10264 * also flushes the "current" TLB entries, i.e. servicing the
10265 * flush "all" will clear any request to flush "current".
10267 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
10268 kvm_vcpu_flush_tlb_all(vcpu);
10270 kvm_service_local_tlb_flush_requests(vcpu);
10273 * Fall back to a "full" guest flush if Hyper-V's precise
10274 * flushing fails. Note, Hyper-V's flushing is per-vCPU, but
10275 * the flushes are considered "remote" and not "local" because
10276 * the requests can be initiated from other vCPUs.
10278 if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu) &&
10279 kvm_hv_vcpu_flush_tlb(vcpu))
10280 kvm_vcpu_flush_tlb_guest(vcpu);
10282 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
10283 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
10287 if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
10288 if (is_guest_mode(vcpu))
10289 kvm_x86_ops.nested_ops->triple_fault(vcpu);
10291 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
10292 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
10293 vcpu->mmio_needed = 0;
10298 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
10299 /* Page is swapped out. Do synthetic halt */
10300 vcpu->arch.apf.halted = true;
10304 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
10305 record_steal_time(vcpu);
10306 #ifdef CONFIG_KVM_SMM
10307 if (kvm_check_request(KVM_REQ_SMI, vcpu))
10310 if (kvm_check_request(KVM_REQ_NMI, vcpu))
10312 if (kvm_check_request(KVM_REQ_PMU, vcpu))
10313 kvm_pmu_handle_event(vcpu);
10314 if (kvm_check_request(KVM_REQ_PMI, vcpu))
10315 kvm_pmu_deliver_pmi(vcpu);
10316 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {
10317 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255);
10318 if (test_bit(vcpu->arch.pending_ioapic_eoi,
10319 vcpu->arch.ioapic_handled_vectors)) {
10320 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI;
10321 vcpu->run->eoi.vector =
10322 vcpu->arch.pending_ioapic_eoi;
10327 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
10328 vcpu_scan_ioapic(vcpu);
10329 if (kvm_check_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu))
10330 vcpu_load_eoi_exitmap(vcpu);
10331 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
10332 kvm_vcpu_reload_apic_access_page(vcpu);
10333 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
10334 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
10335 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
10336 vcpu->run->system_event.ndata = 0;
10340 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) {
10341 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
10342 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET;
10343 vcpu->run->system_event.ndata = 0;
10347 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) {
10348 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
10350 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
10351 vcpu->run->hyperv = hv_vcpu->exit;
10357 * KVM_REQ_HV_STIMER has to be processed after
10358 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers
10359 * depend on the guest clock being up-to-date
10361 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu))
10362 kvm_hv_process_stimers(vcpu);
10363 if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu))
10364 kvm_vcpu_update_apicv(vcpu);
10365 if (kvm_check_request(KVM_REQ_APF_READY, vcpu))
10366 kvm_check_async_pf_completion(vcpu);
10367 if (kvm_check_request(KVM_REQ_MSR_FILTER_CHANGED, vcpu))
10368 static_call(kvm_x86_msr_filter_changed)(vcpu);
10370 if (kvm_check_request(KVM_REQ_UPDATE_CPU_DIRTY_LOGGING, vcpu))
10371 static_call(kvm_x86_update_cpu_dirty_logging)(vcpu);
10374 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win ||
10375 kvm_xen_has_interrupt(vcpu)) {
10376 ++vcpu->stat.req_event;
10377 r = kvm_apic_accept_events(vcpu);
10382 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
10387 r = kvm_check_and_inject_events(vcpu, &req_immediate_exit);
10393 static_call(kvm_x86_enable_irq_window)(vcpu);
10395 if (kvm_lapic_enabled(vcpu)) {
10396 update_cr8_intercept(vcpu);
10397 kvm_lapic_sync_to_vapic(vcpu);
10401 r = kvm_mmu_reload(vcpu);
10403 goto cancel_injection;
10408 static_call(kvm_x86_prepare_switch_to_guest)(vcpu);
10411 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt
10412 * IPI are then delayed after guest entry, which ensures that they
10413 * result in virtual interrupt delivery.
10415 local_irq_disable();
10417 /* Store vcpu->apicv_active before vcpu->mode. */
10418 smp_store_release(&vcpu->mode, IN_GUEST_MODE);
10420 kvm_vcpu_srcu_read_unlock(vcpu);
10423 * 1) We should set ->mode before checking ->requests. Please see
10424 * the comment in kvm_vcpu_exiting_guest_mode().
10426 * 2) For APICv, we should set ->mode before checking PID.ON. This
10427 * pairs with the memory barrier implicit in pi_test_and_set_on
10428 * (see vmx_deliver_posted_interrupt).
10430 * 3) This also orders the write to mode from any reads to the page
10431 * tables done while the VCPU is running. Please see the comment
10432 * in kvm_flush_remote_tlbs.
10434 smp_mb__after_srcu_read_unlock();
10437 * Process pending posted interrupts to handle the case where the
10438 * notification IRQ arrived in the host, or was never sent (because the
10439 * target vCPU wasn't running). Do this regardless of the vCPU's APICv
10440 * status, KVM doesn't update assigned devices when APICv is inhibited,
10441 * i.e. they can post interrupts even if APICv is temporarily disabled.
10443 if (kvm_lapic_enabled(vcpu))
10444 static_call_cond(kvm_x86_sync_pir_to_irr)(vcpu);
10446 if (kvm_vcpu_exit_request(vcpu)) {
10447 vcpu->mode = OUTSIDE_GUEST_MODE;
10449 local_irq_enable();
10451 kvm_vcpu_srcu_read_lock(vcpu);
10453 goto cancel_injection;
10456 if (req_immediate_exit) {
10457 kvm_make_request(KVM_REQ_EVENT, vcpu);
10458 static_call(kvm_x86_request_immediate_exit)(vcpu);
10461 fpregs_assert_state_consistent();
10462 if (test_thread_flag(TIF_NEED_FPU_LOAD))
10463 switch_fpu_return();
10465 if (vcpu->arch.guest_fpu.xfd_err)
10466 wrmsrl(MSR_IA32_XFD_ERR, vcpu->arch.guest_fpu.xfd_err);
10468 if (unlikely(vcpu->arch.switch_db_regs)) {
10469 set_debugreg(0, 7);
10470 set_debugreg(vcpu->arch.eff_db[0], 0);
10471 set_debugreg(vcpu->arch.eff_db[1], 1);
10472 set_debugreg(vcpu->arch.eff_db[2], 2);
10473 set_debugreg(vcpu->arch.eff_db[3], 3);
10474 } else if (unlikely(hw_breakpoint_active())) {
10475 set_debugreg(0, 7);
10478 guest_timing_enter_irqoff();
10482 * Assert that vCPU vs. VM APICv state is consistent. An APICv
10483 * update must kick and wait for all vCPUs before toggling the
10484 * per-VM state, and responsing vCPUs must wait for the update
10485 * to complete before servicing KVM_REQ_APICV_UPDATE.
10487 WARN_ON_ONCE((kvm_vcpu_apicv_activated(vcpu) != kvm_vcpu_apicv_active(vcpu)) &&
10488 (kvm_get_apic_mode(vcpu) != LAPIC_MODE_DISABLED));
10490 exit_fastpath = static_call(kvm_x86_vcpu_run)(vcpu);
10491 if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST))
10494 if (kvm_lapic_enabled(vcpu))
10495 static_call_cond(kvm_x86_sync_pir_to_irr)(vcpu);
10497 if (unlikely(kvm_vcpu_exit_request(vcpu))) {
10498 exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
10504 * Do this here before restoring debug registers on the host. And
10505 * since we do this before handling the vmexit, a DR access vmexit
10506 * can (a) read the correct value of the debug registers, (b) set
10507 * KVM_DEBUGREG_WONT_EXIT again.
10509 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) {
10510 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
10511 static_call(kvm_x86_sync_dirty_debug_regs)(vcpu);
10512 kvm_update_dr0123(vcpu);
10513 kvm_update_dr7(vcpu);
10517 * If the guest has used debug registers, at least dr7
10518 * will be disabled while returning to the host.
10519 * If we don't have active breakpoints in the host, we don't
10520 * care about the messed up debug address registers. But if
10521 * we have some of them active, restore the old state.
10523 if (hw_breakpoint_active())
10524 hw_breakpoint_restore();
10526 vcpu->arch.last_vmentry_cpu = vcpu->cpu;
10527 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
10529 vcpu->mode = OUTSIDE_GUEST_MODE;
10533 * Sync xfd before calling handle_exit_irqoff() which may
10534 * rely on the fact that guest_fpu::xfd is up-to-date (e.g.
10535 * in #NM irqoff handler).
10537 if (vcpu->arch.xfd_no_write_intercept)
10538 fpu_sync_guest_vmexit_xfd_state();
10540 static_call(kvm_x86_handle_exit_irqoff)(vcpu);
10542 if (vcpu->arch.guest_fpu.xfd_err)
10543 wrmsrl(MSR_IA32_XFD_ERR, 0);
10546 * Consume any pending interrupts, including the possible source of
10547 * VM-Exit on SVM and any ticks that occur between VM-Exit and now.
10548 * An instruction is required after local_irq_enable() to fully unblock
10549 * interrupts on processors that implement an interrupt shadow, the
10550 * stat.exits increment will do nicely.
10552 kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
10553 local_irq_enable();
10554 ++vcpu->stat.exits;
10555 local_irq_disable();
10556 kvm_after_interrupt(vcpu);
10559 * Wait until after servicing IRQs to account guest time so that any
10560 * ticks that occurred while running the guest are properly accounted
10561 * to the guest. Waiting until IRQs are enabled degrades the accuracy
10562 * of accounting via context tracking, but the loss of accuracy is
10563 * acceptable for all known use cases.
10565 guest_timing_exit_irqoff();
10567 local_irq_enable();
10570 kvm_vcpu_srcu_read_lock(vcpu);
10573 * Profile KVM exit RIPs:
10575 if (unlikely(prof_on == KVM_PROFILING)) {
10576 unsigned long rip = kvm_rip_read(vcpu);
10577 profile_hit(KVM_PROFILING, (void *)rip);
10580 if (unlikely(vcpu->arch.tsc_always_catchup))
10581 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
10583 if (vcpu->arch.apic_attention)
10584 kvm_lapic_sync_from_vapic(vcpu);
10586 r = static_call(kvm_x86_handle_exit)(vcpu, exit_fastpath);
10590 if (req_immediate_exit)
10591 kvm_make_request(KVM_REQ_EVENT, vcpu);
10592 static_call(kvm_x86_cancel_injection)(vcpu);
10593 if (unlikely(vcpu->arch.apic_attention))
10594 kvm_lapic_sync_from_vapic(vcpu);
10599 /* Called within kvm->srcu read side. */
10600 static inline int vcpu_block(struct kvm_vcpu *vcpu)
10604 if (!kvm_arch_vcpu_runnable(vcpu)) {
10606 * Switch to the software timer before halt-polling/blocking as
10607 * the guest's timer may be a break event for the vCPU, and the
10608 * hypervisor timer runs only when the CPU is in guest mode.
10609 * Switch before halt-polling so that KVM recognizes an expired
10610 * timer before blocking.
10612 hv_timer = kvm_lapic_hv_timer_in_use(vcpu);
10614 kvm_lapic_switch_to_sw_timer(vcpu);
10616 kvm_vcpu_srcu_read_unlock(vcpu);
10617 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
10618 kvm_vcpu_halt(vcpu);
10620 kvm_vcpu_block(vcpu);
10621 kvm_vcpu_srcu_read_lock(vcpu);
10624 kvm_lapic_switch_to_hv_timer(vcpu);
10627 * If the vCPU is not runnable, a signal or another host event
10628 * of some kind is pending; service it without changing the
10629 * vCPU's activity state.
10631 if (!kvm_arch_vcpu_runnable(vcpu))
10636 * Evaluate nested events before exiting the halted state. This allows
10637 * the halt state to be recorded properly in the VMCS12's activity
10638 * state field (AMD does not have a similar field and a VM-Exit always
10639 * causes a spurious wakeup from HLT).
10641 if (is_guest_mode(vcpu)) {
10642 if (kvm_check_nested_events(vcpu) < 0)
10646 if (kvm_apic_accept_events(vcpu) < 0)
10648 switch(vcpu->arch.mp_state) {
10649 case KVM_MP_STATE_HALTED:
10650 case KVM_MP_STATE_AP_RESET_HOLD:
10651 vcpu->arch.pv.pv_unhalted = false;
10652 vcpu->arch.mp_state =
10653 KVM_MP_STATE_RUNNABLE;
10655 case KVM_MP_STATE_RUNNABLE:
10656 vcpu->arch.apf.halted = false;
10658 case KVM_MP_STATE_INIT_RECEIVED:
10667 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
10669 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
10670 !vcpu->arch.apf.halted);
10673 /* Called within kvm->srcu read side. */
10674 static int vcpu_run(struct kvm_vcpu *vcpu)
10678 vcpu->arch.l1tf_flush_l1d = true;
10682 * If another guest vCPU requests a PV TLB flush in the middle
10683 * of instruction emulation, the rest of the emulation could
10684 * use a stale page translation. Assume that any code after
10685 * this point can start executing an instruction.
10687 vcpu->arch.at_instruction_boundary = false;
10688 if (kvm_vcpu_running(vcpu)) {
10689 r = vcpu_enter_guest(vcpu);
10691 r = vcpu_block(vcpu);
10697 kvm_clear_request(KVM_REQ_UNBLOCK, vcpu);
10698 if (kvm_xen_has_pending_events(vcpu))
10699 kvm_xen_inject_pending_events(vcpu);
10701 if (kvm_cpu_has_pending_timer(vcpu))
10702 kvm_inject_pending_timer_irqs(vcpu);
10704 if (dm_request_for_irq_injection(vcpu) &&
10705 kvm_vcpu_ready_for_interrupt_injection(vcpu)) {
10707 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
10708 ++vcpu->stat.request_irq_exits;
10712 if (__xfer_to_guest_mode_work_pending()) {
10713 kvm_vcpu_srcu_read_unlock(vcpu);
10714 r = xfer_to_guest_mode_handle_work(vcpu);
10715 kvm_vcpu_srcu_read_lock(vcpu);
10724 static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
10726 return kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
10729 static int complete_emulated_pio(struct kvm_vcpu *vcpu)
10731 BUG_ON(!vcpu->arch.pio.count);
10733 return complete_emulated_io(vcpu);
10737 * Implements the following, as a state machine:
10740 * for each fragment
10741 * for each mmio piece in the fragment
10748 * for each fragment
10749 * for each mmio piece in the fragment
10754 static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
10756 struct kvm_run *run = vcpu->run;
10757 struct kvm_mmio_fragment *frag;
10760 BUG_ON(!vcpu->mmio_needed);
10762 /* Complete previous fragment */
10763 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
10764 len = min(8u, frag->len);
10765 if (!vcpu->mmio_is_write)
10766 memcpy(frag->data, run->mmio.data, len);
10768 if (frag->len <= 8) {
10769 /* Switch to the next fragment. */
10771 vcpu->mmio_cur_fragment++;
10773 /* Go forward to the next mmio piece. */
10779 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
10780 vcpu->mmio_needed = 0;
10782 /* FIXME: return into emulator if single-stepping. */
10783 if (vcpu->mmio_is_write)
10785 vcpu->mmio_read_completed = 1;
10786 return complete_emulated_io(vcpu);
10789 run->exit_reason = KVM_EXIT_MMIO;
10790 run->mmio.phys_addr = frag->gpa;
10791 if (vcpu->mmio_is_write)
10792 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
10793 run->mmio.len = min(8u, frag->len);
10794 run->mmio.is_write = vcpu->mmio_is_write;
10795 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
10799 /* Swap (qemu) user FPU context for the guest FPU context. */
10800 static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
10802 /* Exclude PKRU, it's restored separately immediately after VM-Exit. */
10803 fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, true);
10807 /* When vcpu_run ends, restore user space FPU context. */
10808 static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
10810 fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, false);
10811 ++vcpu->stat.fpu_reload;
10815 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
10817 struct kvm_queued_exception *ex = &vcpu->arch.exception;
10818 struct kvm_run *kvm_run = vcpu->run;
10822 kvm_sigset_activate(vcpu);
10823 kvm_run->flags = 0;
10824 kvm_load_guest_fpu(vcpu);
10826 kvm_vcpu_srcu_read_lock(vcpu);
10827 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
10828 if (kvm_run->immediate_exit) {
10833 * It should be impossible for the hypervisor timer to be in
10834 * use before KVM has ever run the vCPU.
10836 WARN_ON_ONCE(kvm_lapic_hv_timer_in_use(vcpu));
10838 kvm_vcpu_srcu_read_unlock(vcpu);
10839 kvm_vcpu_block(vcpu);
10840 kvm_vcpu_srcu_read_lock(vcpu);
10842 if (kvm_apic_accept_events(vcpu) < 0) {
10847 if (signal_pending(current)) {
10849 kvm_run->exit_reason = KVM_EXIT_INTR;
10850 ++vcpu->stat.signal_exits;
10855 if ((kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) ||
10856 (kvm_run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS)) {
10861 if (kvm_run->kvm_dirty_regs) {
10862 r = sync_regs(vcpu);
10867 /* re-sync apic's tpr */
10868 if (!lapic_in_kernel(vcpu)) {
10869 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
10876 * If userspace set a pending exception and L2 is active, convert it to
10877 * a pending VM-Exit if L1 wants to intercept the exception.
10879 if (vcpu->arch.exception_from_userspace && is_guest_mode(vcpu) &&
10880 kvm_x86_ops.nested_ops->is_exception_vmexit(vcpu, ex->vector,
10882 kvm_queue_exception_vmexit(vcpu, ex->vector,
10883 ex->has_error_code, ex->error_code,
10884 ex->has_payload, ex->payload);
10885 ex->injected = false;
10886 ex->pending = false;
10888 vcpu->arch.exception_from_userspace = false;
10890 if (unlikely(vcpu->arch.complete_userspace_io)) {
10891 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
10892 vcpu->arch.complete_userspace_io = NULL;
10897 WARN_ON_ONCE(vcpu->arch.pio.count);
10898 WARN_ON_ONCE(vcpu->mmio_needed);
10901 if (kvm_run->immediate_exit) {
10906 r = static_call(kvm_x86_vcpu_pre_run)(vcpu);
10910 r = vcpu_run(vcpu);
10913 kvm_put_guest_fpu(vcpu);
10914 if (kvm_run->kvm_valid_regs)
10916 post_kvm_run_save(vcpu);
10917 kvm_vcpu_srcu_read_unlock(vcpu);
10919 kvm_sigset_deactivate(vcpu);
10924 static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10926 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
10928 * We are here if userspace calls get_regs() in the middle of
10929 * instruction emulation. Registers state needs to be copied
10930 * back from emulation context to vcpu. Userspace shouldn't do
10931 * that usually, but some bad designed PV devices (vmware
10932 * backdoor interface) need this to work
10934 emulator_writeback_register_cache(vcpu->arch.emulate_ctxt);
10935 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
10937 regs->rax = kvm_rax_read(vcpu);
10938 regs->rbx = kvm_rbx_read(vcpu);
10939 regs->rcx = kvm_rcx_read(vcpu);
10940 regs->rdx = kvm_rdx_read(vcpu);
10941 regs->rsi = kvm_rsi_read(vcpu);
10942 regs->rdi = kvm_rdi_read(vcpu);
10943 regs->rsp = kvm_rsp_read(vcpu);
10944 regs->rbp = kvm_rbp_read(vcpu);
10945 #ifdef CONFIG_X86_64
10946 regs->r8 = kvm_r8_read(vcpu);
10947 regs->r9 = kvm_r9_read(vcpu);
10948 regs->r10 = kvm_r10_read(vcpu);
10949 regs->r11 = kvm_r11_read(vcpu);
10950 regs->r12 = kvm_r12_read(vcpu);
10951 regs->r13 = kvm_r13_read(vcpu);
10952 regs->r14 = kvm_r14_read(vcpu);
10953 regs->r15 = kvm_r15_read(vcpu);
10956 regs->rip = kvm_rip_read(vcpu);
10957 regs->rflags = kvm_get_rflags(vcpu);
10960 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10963 __get_regs(vcpu, regs);
10968 static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
10970 vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
10971 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
10973 kvm_rax_write(vcpu, regs->rax);
10974 kvm_rbx_write(vcpu, regs->rbx);
10975 kvm_rcx_write(vcpu, regs->rcx);
10976 kvm_rdx_write(vcpu, regs->rdx);
10977 kvm_rsi_write(vcpu, regs->rsi);
10978 kvm_rdi_write(vcpu, regs->rdi);
10979 kvm_rsp_write(vcpu, regs->rsp);
10980 kvm_rbp_write(vcpu, regs->rbp);
10981 #ifdef CONFIG_X86_64
10982 kvm_r8_write(vcpu, regs->r8);
10983 kvm_r9_write(vcpu, regs->r9);
10984 kvm_r10_write(vcpu, regs->r10);
10985 kvm_r11_write(vcpu, regs->r11);
10986 kvm_r12_write(vcpu, regs->r12);
10987 kvm_r13_write(vcpu, regs->r13);
10988 kvm_r14_write(vcpu, regs->r14);
10989 kvm_r15_write(vcpu, regs->r15);
10992 kvm_rip_write(vcpu, regs->rip);
10993 kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED);
10995 vcpu->arch.exception.pending = false;
10996 vcpu->arch.exception_vmexit.pending = false;
10998 kvm_make_request(KVM_REQ_EVENT, vcpu);
11001 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
11004 __set_regs(vcpu, regs);
11009 static void __get_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
11011 struct desc_ptr dt;
11013 if (vcpu->arch.guest_state_protected)
11014 goto skip_protected_regs;
11016 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
11017 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
11018 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
11019 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
11020 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
11021 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
11023 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
11024 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
11026 static_call(kvm_x86_get_idt)(vcpu, &dt);
11027 sregs->idt.limit = dt.size;
11028 sregs->idt.base = dt.address;
11029 static_call(kvm_x86_get_gdt)(vcpu, &dt);
11030 sregs->gdt.limit = dt.size;
11031 sregs->gdt.base = dt.address;
11033 sregs->cr2 = vcpu->arch.cr2;
11034 sregs->cr3 = kvm_read_cr3(vcpu);
11036 skip_protected_regs:
11037 sregs->cr0 = kvm_read_cr0(vcpu);
11038 sregs->cr4 = kvm_read_cr4(vcpu);
11039 sregs->cr8 = kvm_get_cr8(vcpu);
11040 sregs->efer = vcpu->arch.efer;
11041 sregs->apic_base = kvm_get_apic_base(vcpu);
11044 static void __get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
11046 __get_sregs_common(vcpu, sregs);
11048 if (vcpu->arch.guest_state_protected)
11051 if (vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft)
11052 set_bit(vcpu->arch.interrupt.nr,
11053 (unsigned long *)sregs->interrupt_bitmap);
11056 static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)
11060 __get_sregs_common(vcpu, (struct kvm_sregs *)sregs2);
11062 if (vcpu->arch.guest_state_protected)
11065 if (is_pae_paging(vcpu)) {
11066 for (i = 0 ; i < 4 ; i++)
11067 sregs2->pdptrs[i] = kvm_pdptr_read(vcpu, i);
11068 sregs2->flags |= KVM_SREGS2_FLAGS_PDPTRS_VALID;
11072 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
11073 struct kvm_sregs *sregs)
11076 __get_sregs(vcpu, sregs);
11081 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
11082 struct kvm_mp_state *mp_state)
11087 if (kvm_mpx_supported())
11088 kvm_load_guest_fpu(vcpu);
11090 r = kvm_apic_accept_events(vcpu);
11095 if ((vcpu->arch.mp_state == KVM_MP_STATE_HALTED ||
11096 vcpu->arch.mp_state == KVM_MP_STATE_AP_RESET_HOLD) &&
11097 vcpu->arch.pv.pv_unhalted)
11098 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
11100 mp_state->mp_state = vcpu->arch.mp_state;
11103 if (kvm_mpx_supported())
11104 kvm_put_guest_fpu(vcpu);
11109 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
11110 struct kvm_mp_state *mp_state)
11116 switch (mp_state->mp_state) {
11117 case KVM_MP_STATE_UNINITIALIZED:
11118 case KVM_MP_STATE_HALTED:
11119 case KVM_MP_STATE_AP_RESET_HOLD:
11120 case KVM_MP_STATE_INIT_RECEIVED:
11121 case KVM_MP_STATE_SIPI_RECEIVED:
11122 if (!lapic_in_kernel(vcpu))
11126 case KVM_MP_STATE_RUNNABLE:
11134 * Pending INITs are reported using KVM_SET_VCPU_EVENTS, disallow
11135 * forcing the guest into INIT/SIPI if those events are supposed to be
11136 * blocked. KVM prioritizes SMI over INIT, so reject INIT/SIPI state
11137 * if an SMI is pending as well.
11139 if ((!kvm_apic_init_sipi_allowed(vcpu) || vcpu->arch.smi_pending) &&
11140 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
11141 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
11144 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
11145 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
11146 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);
11148 vcpu->arch.mp_state = mp_state->mp_state;
11149 kvm_make_request(KVM_REQ_EVENT, vcpu);
11157 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
11158 int reason, bool has_error_code, u32 error_code)
11160 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
11163 init_emulate_ctxt(vcpu);
11165 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
11166 has_error_code, error_code);
11168 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
11169 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
11170 vcpu->run->internal.ndata = 0;
11174 kvm_rip_write(vcpu, ctxt->eip);
11175 kvm_set_rflags(vcpu, ctxt->eflags);
11178 EXPORT_SYMBOL_GPL(kvm_task_switch);
11180 static bool kvm_is_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
11182 if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) {
11184 * When EFER.LME and CR0.PG are set, the processor is in
11185 * 64-bit mode (though maybe in a 32-bit code segment).
11186 * CR4.PAE and EFER.LMA must be set.
11188 if (!(sregs->cr4 & X86_CR4_PAE) || !(sregs->efer & EFER_LMA))
11190 if (kvm_vcpu_is_illegal_gpa(vcpu, sregs->cr3))
11194 * Not in 64-bit mode: EFER.LMA is clear and the code
11195 * segment cannot be 64-bit.
11197 if (sregs->efer & EFER_LMA || sregs->cs.l)
11201 return kvm_is_valid_cr4(vcpu, sregs->cr4);
11204 static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
11205 int *mmu_reset_needed, bool update_pdptrs)
11207 struct msr_data apic_base_msr;
11209 struct desc_ptr dt;
11211 if (!kvm_is_valid_sregs(vcpu, sregs))
11214 apic_base_msr.data = sregs->apic_base;
11215 apic_base_msr.host_initiated = true;
11216 if (kvm_set_apic_base(vcpu, &apic_base_msr))
11219 if (vcpu->arch.guest_state_protected)
11222 dt.size = sregs->idt.limit;
11223 dt.address = sregs->idt.base;
11224 static_call(kvm_x86_set_idt)(vcpu, &dt);
11225 dt.size = sregs->gdt.limit;
11226 dt.address = sregs->gdt.base;
11227 static_call(kvm_x86_set_gdt)(vcpu, &dt);
11229 vcpu->arch.cr2 = sregs->cr2;
11230 *mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
11231 vcpu->arch.cr3 = sregs->cr3;
11232 kvm_register_mark_dirty(vcpu, VCPU_EXREG_CR3);
11233 static_call_cond(kvm_x86_post_set_cr3)(vcpu, sregs->cr3);
11235 kvm_set_cr8(vcpu, sregs->cr8);
11237 *mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
11238 static_call(kvm_x86_set_efer)(vcpu, sregs->efer);
11240 *mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
11241 static_call(kvm_x86_set_cr0)(vcpu, sregs->cr0);
11242 vcpu->arch.cr0 = sregs->cr0;
11244 *mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
11245 static_call(kvm_x86_set_cr4)(vcpu, sregs->cr4);
11247 if (update_pdptrs) {
11248 idx = srcu_read_lock(&vcpu->kvm->srcu);
11249 if (is_pae_paging(vcpu)) {
11250 load_pdptrs(vcpu, kvm_read_cr3(vcpu));
11251 *mmu_reset_needed = 1;
11253 srcu_read_unlock(&vcpu->kvm->srcu, idx);
11256 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
11257 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
11258 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
11259 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
11260 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
11261 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
11263 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
11264 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
11266 update_cr8_intercept(vcpu);
11268 /* Older userspace won't unhalt the vcpu on reset. */
11269 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
11270 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
11271 !is_protmode(vcpu))
11272 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
11277 static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
11279 int pending_vec, max_bits;
11280 int mmu_reset_needed = 0;
11281 int ret = __set_sregs_common(vcpu, sregs, &mmu_reset_needed, true);
11286 if (mmu_reset_needed)
11287 kvm_mmu_reset_context(vcpu);
11289 max_bits = KVM_NR_INTERRUPTS;
11290 pending_vec = find_first_bit(
11291 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
11293 if (pending_vec < max_bits) {
11294 kvm_queue_interrupt(vcpu, pending_vec, false);
11295 pr_debug("Set back pending irq %d\n", pending_vec);
11296 kvm_make_request(KVM_REQ_EVENT, vcpu);
11301 static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)
11303 int mmu_reset_needed = 0;
11304 bool valid_pdptrs = sregs2->flags & KVM_SREGS2_FLAGS_PDPTRS_VALID;
11305 bool pae = (sregs2->cr0 & X86_CR0_PG) && (sregs2->cr4 & X86_CR4_PAE) &&
11306 !(sregs2->efer & EFER_LMA);
11309 if (sregs2->flags & ~KVM_SREGS2_FLAGS_PDPTRS_VALID)
11312 if (valid_pdptrs && (!pae || vcpu->arch.guest_state_protected))
11315 ret = __set_sregs_common(vcpu, (struct kvm_sregs *)sregs2,
11316 &mmu_reset_needed, !valid_pdptrs);
11320 if (valid_pdptrs) {
11321 for (i = 0; i < 4 ; i++)
11322 kvm_pdptr_write(vcpu, i, sregs2->pdptrs[i]);
11324 kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
11325 mmu_reset_needed = 1;
11326 vcpu->arch.pdptrs_from_userspace = true;
11328 if (mmu_reset_needed)
11329 kvm_mmu_reset_context(vcpu);
11333 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
11334 struct kvm_sregs *sregs)
11339 ret = __set_sregs(vcpu, sregs);
11344 static void kvm_arch_vcpu_guestdbg_update_apicv_inhibit(struct kvm *kvm)
11347 struct kvm_vcpu *vcpu;
11353 down_write(&kvm->arch.apicv_update_lock);
11355 kvm_for_each_vcpu(i, vcpu, kvm) {
11356 if (vcpu->guest_debug & KVM_GUESTDBG_BLOCKIRQ) {
11361 __kvm_set_or_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_BLOCKIRQ, set);
11362 up_write(&kvm->arch.apicv_update_lock);
11365 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
11366 struct kvm_guest_debug *dbg)
11368 unsigned long rflags;
11371 if (vcpu->arch.guest_state_protected)
11376 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
11378 if (kvm_is_exception_pending(vcpu))
11380 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
11381 kvm_queue_exception(vcpu, DB_VECTOR);
11383 kvm_queue_exception(vcpu, BP_VECTOR);
11387 * Read rflags as long as potentially injected trace flags are still
11390 rflags = kvm_get_rflags(vcpu);
11392 vcpu->guest_debug = dbg->control;
11393 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
11394 vcpu->guest_debug = 0;
11396 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
11397 for (i = 0; i < KVM_NR_DB_REGS; ++i)
11398 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
11399 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7];
11401 for (i = 0; i < KVM_NR_DB_REGS; i++)
11402 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
11404 kvm_update_dr7(vcpu);
11406 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
11407 vcpu->arch.singlestep_rip = kvm_get_linear_rip(vcpu);
11410 * Trigger an rflags update that will inject or remove the trace
11413 kvm_set_rflags(vcpu, rflags);
11415 static_call(kvm_x86_update_exception_bitmap)(vcpu);
11417 kvm_arch_vcpu_guestdbg_update_apicv_inhibit(vcpu->kvm);
11427 * Translate a guest virtual address to a guest physical address.
11429 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
11430 struct kvm_translation *tr)
11432 unsigned long vaddr = tr->linear_address;
11438 idx = srcu_read_lock(&vcpu->kvm->srcu);
11439 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
11440 srcu_read_unlock(&vcpu->kvm->srcu, idx);
11441 tr->physical_address = gpa;
11442 tr->valid = gpa != INVALID_GPA;
11450 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
11452 struct fxregs_state *fxsave;
11454 if (fpstate_is_confidential(&vcpu->arch.guest_fpu))
11459 fxsave = &vcpu->arch.guest_fpu.fpstate->regs.fxsave;
11460 memcpy(fpu->fpr, fxsave->st_space, 128);
11461 fpu->fcw = fxsave->cwd;
11462 fpu->fsw = fxsave->swd;
11463 fpu->ftwx = fxsave->twd;
11464 fpu->last_opcode = fxsave->fop;
11465 fpu->last_ip = fxsave->rip;
11466 fpu->last_dp = fxsave->rdp;
11467 memcpy(fpu->xmm, fxsave->xmm_space, sizeof(fxsave->xmm_space));
11473 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
11475 struct fxregs_state *fxsave;
11477 if (fpstate_is_confidential(&vcpu->arch.guest_fpu))
11482 fxsave = &vcpu->arch.guest_fpu.fpstate->regs.fxsave;
11484 memcpy(fxsave->st_space, fpu->fpr, 128);
11485 fxsave->cwd = fpu->fcw;
11486 fxsave->swd = fpu->fsw;
11487 fxsave->twd = fpu->ftwx;
11488 fxsave->fop = fpu->last_opcode;
11489 fxsave->rip = fpu->last_ip;
11490 fxsave->rdp = fpu->last_dp;
11491 memcpy(fxsave->xmm_space, fpu->xmm, sizeof(fxsave->xmm_space));
11497 static void store_regs(struct kvm_vcpu *vcpu)
11499 BUILD_BUG_ON(sizeof(struct kvm_sync_regs) > SYNC_REGS_SIZE_BYTES);
11501 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_REGS)
11502 __get_regs(vcpu, &vcpu->run->s.regs.regs);
11504 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_SREGS)
11505 __get_sregs(vcpu, &vcpu->run->s.regs.sregs);
11507 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_EVENTS)
11508 kvm_vcpu_ioctl_x86_get_vcpu_events(
11509 vcpu, &vcpu->run->s.regs.events);
11512 static int sync_regs(struct kvm_vcpu *vcpu)
11514 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) {
11515 __set_regs(vcpu, &vcpu->run->s.regs.regs);
11516 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS;
11518 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_SREGS) {
11519 if (__set_sregs(vcpu, &vcpu->run->s.regs.sregs))
11521 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_SREGS;
11523 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_EVENTS) {
11524 if (kvm_vcpu_ioctl_x86_set_vcpu_events(
11525 vcpu, &vcpu->run->s.regs.events))
11527 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_EVENTS;
11533 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
11535 if (kvm_check_tsc_unstable() && kvm->created_vcpus)
11536 pr_warn_once("kvm: SMP vm created on host with unstable TSC; "
11537 "guest TSC will not be reliable\n");
11539 if (!kvm->arch.max_vcpu_ids)
11540 kvm->arch.max_vcpu_ids = KVM_MAX_VCPU_IDS;
11542 if (id >= kvm->arch.max_vcpu_ids)
11545 return static_call(kvm_x86_vcpu_precreate)(kvm);
11548 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
11553 vcpu->arch.last_vmentry_cpu = -1;
11554 vcpu->arch.regs_avail = ~0;
11555 vcpu->arch.regs_dirty = ~0;
11557 kvm_gpc_init(&vcpu->arch.pv_time, vcpu->kvm, vcpu, KVM_HOST_USES_PFN);
11559 if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu))
11560 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
11562 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
11564 r = kvm_mmu_create(vcpu);
11568 if (irqchip_in_kernel(vcpu->kvm)) {
11569 r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
11571 goto fail_mmu_destroy;
11574 * Defer evaluating inhibits until the vCPU is first run, as
11575 * this vCPU will not get notified of any changes until this
11576 * vCPU is visible to other vCPUs (marked online and added to
11577 * the set of vCPUs). Opportunistically mark APICv active as
11578 * VMX in particularly is highly unlikely to have inhibits.
11579 * Ignore the current per-VM APICv state so that vCPU creation
11580 * is guaranteed to run with a deterministic value, the request
11581 * will ensure the vCPU gets the correct state before VM-Entry.
11583 if (enable_apicv) {
11584 vcpu->arch.apic->apicv_active = true;
11585 kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu);
11588 static_branch_inc(&kvm_has_noapic_vcpu);
11592 page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
11594 goto fail_free_lapic;
11595 vcpu->arch.pio_data = page_address(page);
11597 vcpu->arch.mce_banks = kcalloc(KVM_MAX_MCE_BANKS * 4, sizeof(u64),
11598 GFP_KERNEL_ACCOUNT);
11599 vcpu->arch.mci_ctl2_banks = kcalloc(KVM_MAX_MCE_BANKS, sizeof(u64),
11600 GFP_KERNEL_ACCOUNT);
11601 if (!vcpu->arch.mce_banks || !vcpu->arch.mci_ctl2_banks)
11602 goto fail_free_mce_banks;
11603 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
11605 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
11606 GFP_KERNEL_ACCOUNT))
11607 goto fail_free_mce_banks;
11609 if (!alloc_emulate_ctxt(vcpu))
11610 goto free_wbinvd_dirty_mask;
11612 if (!fpu_alloc_guest_fpstate(&vcpu->arch.guest_fpu)) {
11613 pr_err("kvm: failed to allocate vcpu's fpu\n");
11614 goto free_emulate_ctxt;
11617 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
11618 vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
11620 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
11622 kvm_async_pf_hash_reset(vcpu);
11624 vcpu->arch.perf_capabilities = kvm_caps.supported_perf_cap;
11625 kvm_pmu_init(vcpu);
11627 vcpu->arch.pending_external_vector = -1;
11628 vcpu->arch.preempted_in_kernel = false;
11630 #if IS_ENABLED(CONFIG_HYPERV)
11631 vcpu->arch.hv_root_tdp = INVALID_PAGE;
11634 r = static_call(kvm_x86_vcpu_create)(vcpu);
11636 goto free_guest_fpu;
11638 vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
11639 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
11640 kvm_xen_init_vcpu(vcpu);
11641 kvm_vcpu_mtrr_init(vcpu);
11643 kvm_set_tsc_khz(vcpu, vcpu->kvm->arch.default_tsc_khz);
11644 kvm_vcpu_reset(vcpu, false);
11645 kvm_init_mmu(vcpu);
11650 fpu_free_guest_fpstate(&vcpu->arch.guest_fpu);
11652 kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt);
11653 free_wbinvd_dirty_mask:
11654 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
11655 fail_free_mce_banks:
11656 kfree(vcpu->arch.mce_banks);
11657 kfree(vcpu->arch.mci_ctl2_banks);
11658 free_page((unsigned long)vcpu->arch.pio_data);
11660 kvm_free_lapic(vcpu);
11662 kvm_mmu_destroy(vcpu);
11666 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
11668 struct kvm *kvm = vcpu->kvm;
11670 if (mutex_lock_killable(&vcpu->mutex))
11673 kvm_synchronize_tsc(vcpu, 0);
11676 /* poll control enabled by default */
11677 vcpu->arch.msr_kvm_poll_control = 1;
11679 mutex_unlock(&vcpu->mutex);
11681 if (kvmclock_periodic_sync && vcpu->vcpu_idx == 0)
11682 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
11683 KVMCLOCK_SYNC_PERIOD);
11686 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
11690 kvmclock_reset(vcpu);
11692 static_call(kvm_x86_vcpu_free)(vcpu);
11694 kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt);
11695 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
11696 fpu_free_guest_fpstate(&vcpu->arch.guest_fpu);
11698 kvm_xen_destroy_vcpu(vcpu);
11699 kvm_hv_vcpu_uninit(vcpu);
11700 kvm_pmu_destroy(vcpu);
11701 kfree(vcpu->arch.mce_banks);
11702 kfree(vcpu->arch.mci_ctl2_banks);
11703 kvm_free_lapic(vcpu);
11704 idx = srcu_read_lock(&vcpu->kvm->srcu);
11705 kvm_mmu_destroy(vcpu);
11706 srcu_read_unlock(&vcpu->kvm->srcu, idx);
11707 free_page((unsigned long)vcpu->arch.pio_data);
11708 kvfree(vcpu->arch.cpuid_entries);
11709 if (!lapic_in_kernel(vcpu))
11710 static_branch_dec(&kvm_has_noapic_vcpu);
11713 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
11715 struct kvm_cpuid_entry2 *cpuid_0x1;
11716 unsigned long old_cr0 = kvm_read_cr0(vcpu);
11717 unsigned long new_cr0;
11720 * Several of the "set" flows, e.g. ->set_cr0(), read other registers
11721 * to handle side effects. RESET emulation hits those flows and relies
11722 * on emulated/virtualized registers, including those that are loaded
11723 * into hardware, to be zeroed at vCPU creation. Use CRs as a sentinel
11724 * to detect improper or missing initialization.
11726 WARN_ON_ONCE(!init_event &&
11727 (old_cr0 || kvm_read_cr3(vcpu) || kvm_read_cr4(vcpu)));
11730 * SVM doesn't unconditionally VM-Exit on INIT and SHUTDOWN, thus it's
11731 * possible to INIT the vCPU while L2 is active. Force the vCPU back
11732 * into L1 as EFER.SVME is cleared on INIT (along with all other EFER
11733 * bits), i.e. virtualization is disabled.
11735 if (is_guest_mode(vcpu))
11736 kvm_leave_nested(vcpu);
11738 kvm_lapic_reset(vcpu, init_event);
11740 WARN_ON_ONCE(is_guest_mode(vcpu) || is_smm(vcpu));
11741 vcpu->arch.hflags = 0;
11743 vcpu->arch.smi_pending = 0;
11744 vcpu->arch.smi_count = 0;
11745 atomic_set(&vcpu->arch.nmi_queued, 0);
11746 vcpu->arch.nmi_pending = 0;
11747 vcpu->arch.nmi_injected = false;
11748 kvm_clear_interrupt_queue(vcpu);
11749 kvm_clear_exception_queue(vcpu);
11751 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
11752 kvm_update_dr0123(vcpu);
11753 vcpu->arch.dr6 = DR6_ACTIVE_LOW;
11754 vcpu->arch.dr7 = DR7_FIXED_1;
11755 kvm_update_dr7(vcpu);
11757 vcpu->arch.cr2 = 0;
11759 kvm_make_request(KVM_REQ_EVENT, vcpu);
11760 vcpu->arch.apf.msr_en_val = 0;
11761 vcpu->arch.apf.msr_int_val = 0;
11762 vcpu->arch.st.msr_val = 0;
11764 kvmclock_reset(vcpu);
11766 kvm_clear_async_pf_completion_queue(vcpu);
11767 kvm_async_pf_hash_reset(vcpu);
11768 vcpu->arch.apf.halted = false;
11770 if (vcpu->arch.guest_fpu.fpstate && kvm_mpx_supported()) {
11771 struct fpstate *fpstate = vcpu->arch.guest_fpu.fpstate;
11774 * All paths that lead to INIT are required to load the guest's
11775 * FPU state (because most paths are buried in KVM_RUN).
11778 kvm_put_guest_fpu(vcpu);
11780 fpstate_clear_xstate_component(fpstate, XFEATURE_BNDREGS);
11781 fpstate_clear_xstate_component(fpstate, XFEATURE_BNDCSR);
11784 kvm_load_guest_fpu(vcpu);
11788 kvm_pmu_reset(vcpu);
11789 vcpu->arch.smbase = 0x30000;
11791 vcpu->arch.msr_misc_features_enables = 0;
11792 vcpu->arch.ia32_misc_enable_msr = MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL |
11793 MSR_IA32_MISC_ENABLE_BTS_UNAVAIL;
11795 __kvm_set_xcr(vcpu, 0, XFEATURE_MASK_FP);
11796 __kvm_set_msr(vcpu, MSR_IA32_XSS, 0, true);
11799 /* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */
11800 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
11801 kvm_register_mark_dirty(vcpu, VCPU_REGS_RSP);
11804 * Fall back to KVM's default Family/Model/Stepping of 0x600 (P6/Athlon)
11805 * if no CPUID match is found. Note, it's impossible to get a match at
11806 * RESET since KVM emulates RESET before exposing the vCPU to userspace,
11807 * i.e. it's impossible for kvm_find_cpuid_entry() to find a valid entry
11808 * on RESET. But, go through the motions in case that's ever remedied.
11810 cpuid_0x1 = kvm_find_cpuid_entry(vcpu, 1);
11811 kvm_rdx_write(vcpu, cpuid_0x1 ? cpuid_0x1->eax : 0x600);
11813 static_call(kvm_x86_vcpu_reset)(vcpu, init_event);
11815 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
11816 kvm_rip_write(vcpu, 0xfff0);
11818 vcpu->arch.cr3 = 0;
11819 kvm_register_mark_dirty(vcpu, VCPU_EXREG_CR3);
11822 * CR0.CD/NW are set on RESET, preserved on INIT. Note, some versions
11823 * of Intel's SDM list CD/NW as being set on INIT, but they contradict
11824 * (or qualify) that with a footnote stating that CD/NW are preserved.
11826 new_cr0 = X86_CR0_ET;
11828 new_cr0 |= (old_cr0 & (X86_CR0_NW | X86_CR0_CD));
11830 new_cr0 |= X86_CR0_NW | X86_CR0_CD;
11832 static_call(kvm_x86_set_cr0)(vcpu, new_cr0);
11833 static_call(kvm_x86_set_cr4)(vcpu, 0);
11834 static_call(kvm_x86_set_efer)(vcpu, 0);
11835 static_call(kvm_x86_update_exception_bitmap)(vcpu);
11838 * On the standard CR0/CR4/EFER modification paths, there are several
11839 * complex conditions determining whether the MMU has to be reset and/or
11840 * which PCIDs have to be flushed. However, CR0.WP and the paging-related
11841 * bits in CR4 and EFER are irrelevant if CR0.PG was '0'; and a reset+flush
11842 * is needed anyway if CR0.PG was '1' (which can only happen for INIT, as
11843 * CR0 will be '0' prior to RESET). So we only need to check CR0.PG here.
11845 if (old_cr0 & X86_CR0_PG) {
11846 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
11847 kvm_mmu_reset_context(vcpu);
11851 * Intel's SDM states that all TLB entries are flushed on INIT. AMD's
11852 * APM states the TLBs are untouched by INIT, but it also states that
11853 * the TLBs are flushed on "External initialization of the processor."
11854 * Flush the guest TLB regardless of vendor, there is no meaningful
11855 * benefit in relying on the guest to flush the TLB immediately after
11856 * INIT. A spurious TLB flush is benign and likely negligible from a
11857 * performance perspective.
11860 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
11862 EXPORT_SYMBOL_GPL(kvm_vcpu_reset);
11864 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
11866 struct kvm_segment cs;
11868 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
11869 cs.selector = vector << 8;
11870 cs.base = vector << 12;
11871 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
11872 kvm_rip_write(vcpu, 0);
11874 EXPORT_SYMBOL_GPL(kvm_vcpu_deliver_sipi_vector);
11876 int kvm_arch_hardware_enable(void)
11879 struct kvm_vcpu *vcpu;
11884 bool stable, backwards_tsc = false;
11886 kvm_user_return_msr_cpu_online();
11887 ret = static_call(kvm_x86_hardware_enable)();
11891 local_tsc = rdtsc();
11892 stable = !kvm_check_tsc_unstable();
11893 list_for_each_entry(kvm, &vm_list, vm_list) {
11894 kvm_for_each_vcpu(i, vcpu, kvm) {
11895 if (!stable && vcpu->cpu == smp_processor_id())
11896 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
11897 if (stable && vcpu->arch.last_host_tsc > local_tsc) {
11898 backwards_tsc = true;
11899 if (vcpu->arch.last_host_tsc > max_tsc)
11900 max_tsc = vcpu->arch.last_host_tsc;
11906 * Sometimes, even reliable TSCs go backwards. This happens on
11907 * platforms that reset TSC during suspend or hibernate actions, but
11908 * maintain synchronization. We must compensate. Fortunately, we can
11909 * detect that condition here, which happens early in CPU bringup,
11910 * before any KVM threads can be running. Unfortunately, we can't
11911 * bring the TSCs fully up to date with real time, as we aren't yet far
11912 * enough into CPU bringup that we know how much real time has actually
11913 * elapsed; our helper function, ktime_get_boottime_ns() will be using boot
11914 * variables that haven't been updated yet.
11916 * So we simply find the maximum observed TSC above, then record the
11917 * adjustment to TSC in each VCPU. When the VCPU later gets loaded,
11918 * the adjustment will be applied. Note that we accumulate
11919 * adjustments, in case multiple suspend cycles happen before some VCPU
11920 * gets a chance to run again. In the event that no KVM threads get a
11921 * chance to run, we will miss the entire elapsed period, as we'll have
11922 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
11923 * loose cycle time. This isn't too big a deal, since the loss will be
11924 * uniform across all VCPUs (not to mention the scenario is extremely
11925 * unlikely). It is possible that a second hibernate recovery happens
11926 * much faster than a first, causing the observed TSC here to be
11927 * smaller; this would require additional padding adjustment, which is
11928 * why we set last_host_tsc to the local tsc observed here.
11930 * N.B. - this code below runs only on platforms with reliable TSC,
11931 * as that is the only way backwards_tsc is set above. Also note
11932 * that this runs for ALL vcpus, which is not a bug; all VCPUs should
11933 * have the same delta_cyc adjustment applied if backwards_tsc
11934 * is detected. Note further, this adjustment is only done once,
11935 * as we reset last_host_tsc on all VCPUs to stop this from being
11936 * called multiple times (one for each physical CPU bringup).
11938 * Platforms with unreliable TSCs don't have to deal with this, they
11939 * will be compensated by the logic in vcpu_load, which sets the TSC to
11940 * catchup mode. This will catchup all VCPUs to real time, but cannot
11941 * guarantee that they stay in perfect synchronization.
11943 if (backwards_tsc) {
11944 u64 delta_cyc = max_tsc - local_tsc;
11945 list_for_each_entry(kvm, &vm_list, vm_list) {
11946 kvm->arch.backwards_tsc_observed = true;
11947 kvm_for_each_vcpu(i, vcpu, kvm) {
11948 vcpu->arch.tsc_offset_adjustment += delta_cyc;
11949 vcpu->arch.last_host_tsc = local_tsc;
11950 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
11954 * We have to disable TSC offset matching.. if you were
11955 * booting a VM while issuing an S4 host suspend....
11956 * you may have some problem. Solving this issue is
11957 * left as an exercise to the reader.
11959 kvm->arch.last_tsc_nsec = 0;
11960 kvm->arch.last_tsc_write = 0;
11967 void kvm_arch_hardware_disable(void)
11969 static_call(kvm_x86_hardware_disable)();
11970 drop_user_return_notifiers();
11973 static inline void kvm_ops_update(struct kvm_x86_init_ops *ops)
11975 memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops));
11977 #define __KVM_X86_OP(func) \
11978 static_call_update(kvm_x86_##func, kvm_x86_ops.func);
11979 #define KVM_X86_OP(func) \
11980 WARN_ON(!kvm_x86_ops.func); __KVM_X86_OP(func)
11981 #define KVM_X86_OP_OPTIONAL __KVM_X86_OP
11982 #define KVM_X86_OP_OPTIONAL_RET0(func) \
11983 static_call_update(kvm_x86_##func, (void *)kvm_x86_ops.func ? : \
11984 (void *)__static_call_return0);
11985 #include <asm/kvm-x86-ops.h>
11986 #undef __KVM_X86_OP
11988 kvm_pmu_ops_update(ops->pmu_ops);
11991 int kvm_arch_hardware_setup(void *opaque)
11993 struct kvm_x86_init_ops *ops = opaque;
11996 rdmsrl_safe(MSR_EFER, &host_efer);
11998 if (boot_cpu_has(X86_FEATURE_XSAVES))
11999 rdmsrl(MSR_IA32_XSS, host_xss);
12001 kvm_init_pmu_capability();
12003 r = ops->hardware_setup();
12007 kvm_ops_update(ops);
12009 kvm_register_perf_callbacks(ops->handle_intel_pt_intr);
12011 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
12012 kvm_caps.supported_xss = 0;
12014 #define __kvm_cpu_cap_has(UNUSED_, f) kvm_cpu_cap_has(f)
12015 cr4_reserved_bits = __cr4_reserved_bits(__kvm_cpu_cap_has, UNUSED_);
12016 #undef __kvm_cpu_cap_has
12018 if (kvm_caps.has_tsc_control) {
12020 * Make sure the user can only configure tsc_khz values that
12021 * fit into a signed integer.
12022 * A min value is not calculated because it will always
12023 * be 1 on all machines.
12025 u64 max = min(0x7fffffffULL,
12026 __scale_tsc(kvm_caps.max_tsc_scaling_ratio, tsc_khz));
12027 kvm_caps.max_guest_tsc_khz = max;
12029 kvm_caps.default_tsc_scaling_ratio = 1ULL << kvm_caps.tsc_scaling_ratio_frac_bits;
12030 kvm_init_msr_list();
12034 void kvm_arch_hardware_unsetup(void)
12036 kvm_unregister_perf_callbacks();
12038 static_call(kvm_x86_hardware_unsetup)();
12041 int kvm_arch_check_processor_compat(void *opaque)
12043 struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
12044 struct kvm_x86_init_ops *ops = opaque;
12046 WARN_ON(!irqs_disabled());
12048 if (__cr4_reserved_bits(cpu_has, c) !=
12049 __cr4_reserved_bits(cpu_has, &boot_cpu_data))
12052 return ops->check_processor_compatibility();
12055 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
12057 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id;
12060 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
12062 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
12065 __read_mostly DEFINE_STATIC_KEY_FALSE(kvm_has_noapic_vcpu);
12066 EXPORT_SYMBOL_GPL(kvm_has_noapic_vcpu);
12068 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
12070 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
12072 vcpu->arch.l1tf_flush_l1d = true;
12073 if (pmu->version && unlikely(pmu->event_count)) {
12074 pmu->need_cleanup = true;
12075 kvm_make_request(KVM_REQ_PMU, vcpu);
12077 static_call(kvm_x86_sched_in)(vcpu, cpu);
12080 void kvm_arch_free_vm(struct kvm *kvm)
12082 kfree(to_kvm_hv(kvm)->hv_pa_pg);
12083 __kvm_arch_free_vm(kvm);
12087 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
12090 unsigned long flags;
12095 ret = kvm_page_track_init(kvm);
12099 ret = kvm_mmu_init_vm(kvm);
12101 goto out_page_track;
12103 ret = static_call(kvm_x86_vm_init)(kvm);
12105 goto out_uninit_mmu;
12107 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list);
12108 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
12109 atomic_set(&kvm->arch.noncoherent_dma_count, 0);
12111 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
12112 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
12113 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
12114 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
12115 &kvm->arch.irq_sources_bitmap);
12117 raw_spin_lock_init(&kvm->arch.tsc_write_lock);
12118 mutex_init(&kvm->arch.apic_map_lock);
12119 seqcount_raw_spinlock_init(&kvm->arch.pvclock_sc, &kvm->arch.tsc_write_lock);
12120 kvm->arch.kvmclock_offset = -get_kvmclock_base_ns();
12122 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
12123 pvclock_update_vm_gtod_copy(kvm);
12124 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
12126 kvm->arch.default_tsc_khz = max_tsc_khz ? : tsc_khz;
12127 kvm->arch.guest_can_read_msr_platform_info = true;
12128 kvm->arch.enable_pmu = enable_pmu;
12130 #if IS_ENABLED(CONFIG_HYPERV)
12131 spin_lock_init(&kvm->arch.hv_root_tdp_lock);
12132 kvm->arch.hv_root_tdp = INVALID_PAGE;
12135 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn);
12136 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn);
12138 kvm_apicv_init(kvm);
12139 kvm_hv_init_vm(kvm);
12140 kvm_xen_init_vm(kvm);
12145 kvm_mmu_uninit_vm(kvm);
12147 kvm_page_track_cleanup(kvm);
12152 int kvm_arch_post_init_vm(struct kvm *kvm)
12154 return kvm_mmu_post_init_vm(kvm);
12157 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
12160 kvm_mmu_unload(vcpu);
12164 static void kvm_unload_vcpu_mmus(struct kvm *kvm)
12167 struct kvm_vcpu *vcpu;
12169 kvm_for_each_vcpu(i, vcpu, kvm) {
12170 kvm_clear_async_pf_completion_queue(vcpu);
12171 kvm_unload_vcpu_mmu(vcpu);
12175 void kvm_arch_sync_events(struct kvm *kvm)
12177 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
12178 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
12183 * __x86_set_memory_region: Setup KVM internal memory slot
12185 * @kvm: the kvm pointer to the VM.
12186 * @id: the slot ID to setup.
12187 * @gpa: the GPA to install the slot (unused when @size == 0).
12188 * @size: the size of the slot. Set to zero to uninstall a slot.
12190 * This function helps to setup a KVM internal memory slot. Specify
12191 * @size > 0 to install a new slot, while @size == 0 to uninstall a
12192 * slot. The return code can be one of the following:
12194 * HVA: on success (uninstall will return a bogus HVA)
12197 * The caller should always use IS_ERR() to check the return value
12198 * before use. Note, the KVM internal memory slots are guaranteed to
12199 * remain valid and unchanged until the VM is destroyed, i.e., the
12200 * GPA->HVA translation will not change. However, the HVA is a user
12201 * address, i.e. its accessibility is not guaranteed, and must be
12202 * accessed via __copy_{to,from}_user().
12204 void __user * __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa,
12208 unsigned long hva, old_npages;
12209 struct kvm_memslots *slots = kvm_memslots(kvm);
12210 struct kvm_memory_slot *slot;
12212 /* Called with kvm->slots_lock held. */
12213 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM))
12214 return ERR_PTR_USR(-EINVAL);
12216 slot = id_to_memslot(slots, id);
12218 if (slot && slot->npages)
12219 return ERR_PTR_USR(-EEXIST);
12222 * MAP_SHARED to prevent internal slot pages from being moved
12225 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE,
12226 MAP_SHARED | MAP_ANONYMOUS, 0);
12227 if (IS_ERR((void *)hva))
12228 return (void __user *)hva;
12230 if (!slot || !slot->npages)
12233 old_npages = slot->npages;
12234 hva = slot->userspace_addr;
12237 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
12238 struct kvm_userspace_memory_region m;
12240 m.slot = id | (i << 16);
12242 m.guest_phys_addr = gpa;
12243 m.userspace_addr = hva;
12244 m.memory_size = size;
12245 r = __kvm_set_memory_region(kvm, &m);
12247 return ERR_PTR_USR(r);
12251 vm_munmap(hva, old_npages * PAGE_SIZE);
12253 return (void __user *)hva;
12255 EXPORT_SYMBOL_GPL(__x86_set_memory_region);
12257 void kvm_arch_pre_destroy_vm(struct kvm *kvm)
12259 kvm_mmu_pre_destroy_vm(kvm);
12262 void kvm_arch_destroy_vm(struct kvm *kvm)
12264 if (current->mm == kvm->mm) {
12266 * Free memory regions allocated on behalf of userspace,
12267 * unless the memory map has changed due to process exit
12270 mutex_lock(&kvm->slots_lock);
12271 __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
12273 __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT,
12275 __x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
12276 mutex_unlock(&kvm->slots_lock);
12278 kvm_unload_vcpu_mmus(kvm);
12279 static_call_cond(kvm_x86_vm_destroy)(kvm);
12280 kvm_free_msr_filter(srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1));
12281 kvm_pic_destroy(kvm);
12282 kvm_ioapic_destroy(kvm);
12283 kvm_destroy_vcpus(kvm);
12284 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1));
12285 kfree(srcu_dereference_check(kvm->arch.pmu_event_filter, &kvm->srcu, 1));
12286 kvm_mmu_uninit_vm(kvm);
12287 kvm_page_track_cleanup(kvm);
12288 kvm_xen_destroy_vm(kvm);
12289 kvm_hv_destroy_vm(kvm);
12292 static void memslot_rmap_free(struct kvm_memory_slot *slot)
12296 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
12297 kvfree(slot->arch.rmap[i]);
12298 slot->arch.rmap[i] = NULL;
12302 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
12306 memslot_rmap_free(slot);
12308 for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
12309 kvfree(slot->arch.lpage_info[i - 1]);
12310 slot->arch.lpage_info[i - 1] = NULL;
12313 kvm_page_track_free_memslot(slot);
12316 int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages)
12318 const int sz = sizeof(*slot->arch.rmap[0]);
12321 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
12323 int lpages = __kvm_mmu_slot_lpages(slot, npages, level);
12325 if (slot->arch.rmap[i])
12328 slot->arch.rmap[i] = __vcalloc(lpages, sz, GFP_KERNEL_ACCOUNT);
12329 if (!slot->arch.rmap[i]) {
12330 memslot_rmap_free(slot);
12338 static int kvm_alloc_memslot_metadata(struct kvm *kvm,
12339 struct kvm_memory_slot *slot)
12341 unsigned long npages = slot->npages;
12345 * Clear out the previous array pointers for the KVM_MR_MOVE case. The
12346 * old arrays will be freed by __kvm_set_memory_region() if installing
12347 * the new memslot is successful.
12349 memset(&slot->arch, 0, sizeof(slot->arch));
12351 if (kvm_memslots_have_rmaps(kvm)) {
12352 r = memslot_rmap_alloc(slot, npages);
12357 for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
12358 struct kvm_lpage_info *linfo;
12359 unsigned long ugfn;
12363 lpages = __kvm_mmu_slot_lpages(slot, npages, level);
12365 linfo = __vcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
12369 slot->arch.lpage_info[i - 1] = linfo;
12371 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
12372 linfo[0].disallow_lpage = 1;
12373 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
12374 linfo[lpages - 1].disallow_lpage = 1;
12375 ugfn = slot->userspace_addr >> PAGE_SHIFT;
12377 * If the gfn and userspace address are not aligned wrt each
12378 * other, disable large page support for this slot.
12380 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1)) {
12383 for (j = 0; j < lpages; ++j)
12384 linfo[j].disallow_lpage = 1;
12388 if (kvm_page_track_create_memslot(kvm, slot, npages))
12394 memslot_rmap_free(slot);
12396 for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
12397 kvfree(slot->arch.lpage_info[i - 1]);
12398 slot->arch.lpage_info[i - 1] = NULL;
12403 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
12405 struct kvm_vcpu *vcpu;
12409 * memslots->generation has been incremented.
12410 * mmio generation may have reached its maximum value.
12412 kvm_mmu_invalidate_mmio_sptes(kvm, gen);
12414 /* Force re-initialization of steal_time cache */
12415 kvm_for_each_vcpu(i, vcpu, kvm)
12416 kvm_vcpu_kick(vcpu);
12419 int kvm_arch_prepare_memory_region(struct kvm *kvm,
12420 const struct kvm_memory_slot *old,
12421 struct kvm_memory_slot *new,
12422 enum kvm_mr_change change)
12424 if (change == KVM_MR_CREATE || change == KVM_MR_MOVE) {
12425 if ((new->base_gfn + new->npages - 1) > kvm_mmu_max_gfn())
12428 return kvm_alloc_memslot_metadata(kvm, new);
12431 if (change == KVM_MR_FLAGS_ONLY)
12432 memcpy(&new->arch, &old->arch, sizeof(old->arch));
12433 else if (WARN_ON_ONCE(change != KVM_MR_DELETE))
12440 static void kvm_mmu_update_cpu_dirty_logging(struct kvm *kvm, bool enable)
12442 struct kvm_arch *ka = &kvm->arch;
12444 if (!kvm_x86_ops.cpu_dirty_log_size)
12447 if ((enable && ++ka->cpu_dirty_logging_count == 1) ||
12448 (!enable && --ka->cpu_dirty_logging_count == 0))
12449 kvm_make_all_cpus_request(kvm, KVM_REQ_UPDATE_CPU_DIRTY_LOGGING);
12451 WARN_ON_ONCE(ka->cpu_dirty_logging_count < 0);
12454 static void kvm_mmu_slot_apply_flags(struct kvm *kvm,
12455 struct kvm_memory_slot *old,
12456 const struct kvm_memory_slot *new,
12457 enum kvm_mr_change change)
12459 u32 old_flags = old ? old->flags : 0;
12460 u32 new_flags = new ? new->flags : 0;
12461 bool log_dirty_pages = new_flags & KVM_MEM_LOG_DIRTY_PAGES;
12464 * Update CPU dirty logging if dirty logging is being toggled. This
12465 * applies to all operations.
12467 if ((old_flags ^ new_flags) & KVM_MEM_LOG_DIRTY_PAGES)
12468 kvm_mmu_update_cpu_dirty_logging(kvm, log_dirty_pages);
12471 * Nothing more to do for RO slots (which can't be dirtied and can't be
12472 * made writable) or CREATE/MOVE/DELETE of a slot.
12474 * For a memslot with dirty logging disabled:
12475 * CREATE: No dirty mappings will already exist.
12476 * MOVE/DELETE: The old mappings will already have been cleaned up by
12477 * kvm_arch_flush_shadow_memslot()
12479 * For a memslot with dirty logging enabled:
12480 * CREATE: No shadow pages exist, thus nothing to write-protect
12481 * and no dirty bits to clear.
12482 * MOVE/DELETE: The old mappings will already have been cleaned up by
12483 * kvm_arch_flush_shadow_memslot().
12485 if ((change != KVM_MR_FLAGS_ONLY) || (new_flags & KVM_MEM_READONLY))
12489 * READONLY and non-flags changes were filtered out above, and the only
12490 * other flag is LOG_DIRTY_PAGES, i.e. something is wrong if dirty
12491 * logging isn't being toggled on or off.
12493 if (WARN_ON_ONCE(!((old_flags ^ new_flags) & KVM_MEM_LOG_DIRTY_PAGES)))
12496 if (!log_dirty_pages) {
12498 * Dirty logging tracks sptes in 4k granularity, meaning that
12499 * large sptes have to be split. If live migration succeeds,
12500 * the guest in the source machine will be destroyed and large
12501 * sptes will be created in the destination. However, if the
12502 * guest continues to run in the source machine (for example if
12503 * live migration fails), small sptes will remain around and
12504 * cause bad performance.
12506 * Scan sptes if dirty logging has been stopped, dropping those
12507 * which can be collapsed into a single large-page spte. Later
12508 * page faults will create the large-page sptes.
12510 kvm_mmu_zap_collapsible_sptes(kvm, new);
12513 * Initially-all-set does not require write protecting any page,
12514 * because they're all assumed to be dirty.
12516 if (kvm_dirty_log_manual_protect_and_init_set(kvm))
12519 if (READ_ONCE(eager_page_split))
12520 kvm_mmu_slot_try_split_huge_pages(kvm, new, PG_LEVEL_4K);
12522 if (kvm_x86_ops.cpu_dirty_log_size) {
12523 kvm_mmu_slot_leaf_clear_dirty(kvm, new);
12524 kvm_mmu_slot_remove_write_access(kvm, new, PG_LEVEL_2M);
12526 kvm_mmu_slot_remove_write_access(kvm, new, PG_LEVEL_4K);
12530 * Unconditionally flush the TLBs after enabling dirty logging.
12531 * A flush is almost always going to be necessary (see below),
12532 * and unconditionally flushing allows the helpers to omit
12533 * the subtly complex checks when removing write access.
12535 * Do the flush outside of mmu_lock to reduce the amount of
12536 * time mmu_lock is held. Flushing after dropping mmu_lock is
12537 * safe as KVM only needs to guarantee the slot is fully
12538 * write-protected before returning to userspace, i.e. before
12539 * userspace can consume the dirty status.
12541 * Flushing outside of mmu_lock requires KVM to be careful when
12542 * making decisions based on writable status of an SPTE, e.g. a
12543 * !writable SPTE doesn't guarantee a CPU can't perform writes.
12545 * Specifically, KVM also write-protects guest page tables to
12546 * monitor changes when using shadow paging, and must guarantee
12547 * no CPUs can write to those page before mmu_lock is dropped.
12548 * Because CPUs may have stale TLB entries at this point, a
12549 * !writable SPTE doesn't guarantee CPUs can't perform writes.
12551 * KVM also allows making SPTES writable outside of mmu_lock,
12552 * e.g. to allow dirty logging without taking mmu_lock.
12554 * To handle these scenarios, KVM uses a separate software-only
12555 * bit (MMU-writable) to track if a SPTE is !writable due to
12556 * a guest page table being write-protected (KVM clears the
12557 * MMU-writable flag when write-protecting for shadow paging).
12559 * The use of MMU-writable is also the primary motivation for
12560 * the unconditional flush. Because KVM must guarantee that a
12561 * CPU doesn't contain stale, writable TLB entries for a
12562 * !MMU-writable SPTE, KVM must flush if it encounters any
12563 * MMU-writable SPTE regardless of whether the actual hardware
12564 * writable bit was set. I.e. KVM is almost guaranteed to need
12565 * to flush, while unconditionally flushing allows the "remove
12566 * write access" helpers to ignore MMU-writable entirely.
12568 * See is_writable_pte() for more details (the case involving
12569 * access-tracked SPTEs is particularly relevant).
12571 kvm_arch_flush_remote_tlbs_memslot(kvm, new);
12575 void kvm_arch_commit_memory_region(struct kvm *kvm,
12576 struct kvm_memory_slot *old,
12577 const struct kvm_memory_slot *new,
12578 enum kvm_mr_change change)
12580 if (!kvm->arch.n_requested_mmu_pages &&
12581 (change == KVM_MR_CREATE || change == KVM_MR_DELETE)) {
12582 unsigned long nr_mmu_pages;
12584 nr_mmu_pages = kvm->nr_memslot_pages / KVM_MEMSLOT_PAGES_TO_MMU_PAGES_RATIO;
12585 nr_mmu_pages = max(nr_mmu_pages, KVM_MIN_ALLOC_MMU_PAGES);
12586 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
12589 kvm_mmu_slot_apply_flags(kvm, old, new, change);
12591 /* Free the arrays associated with the old memslot. */
12592 if (change == KVM_MR_MOVE)
12593 kvm_arch_free_memslot(kvm, old);
12596 void kvm_arch_flush_shadow_all(struct kvm *kvm)
12598 kvm_mmu_zap_all(kvm);
12601 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
12602 struct kvm_memory_slot *slot)
12604 kvm_page_track_flush_slot(kvm, slot);
12607 static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu)
12609 return (is_guest_mode(vcpu) &&
12610 static_call(kvm_x86_guest_apic_has_interrupt)(vcpu));
12613 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
12615 if (!list_empty_careful(&vcpu->async_pf.done))
12618 if (kvm_apic_has_pending_init_or_sipi(vcpu) &&
12619 kvm_apic_init_sipi_allowed(vcpu))
12622 if (vcpu->arch.pv.pv_unhalted)
12625 if (kvm_is_exception_pending(vcpu))
12628 if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
12629 (vcpu->arch.nmi_pending &&
12630 static_call(kvm_x86_nmi_allowed)(vcpu, false)))
12633 #ifdef CONFIG_KVM_SMM
12634 if (kvm_test_request(KVM_REQ_SMI, vcpu) ||
12635 (vcpu->arch.smi_pending &&
12636 static_call(kvm_x86_smi_allowed)(vcpu, false)))
12640 if (kvm_arch_interrupt_allowed(vcpu) &&
12641 (kvm_cpu_has_interrupt(vcpu) ||
12642 kvm_guest_apic_has_interrupt(vcpu)))
12645 if (kvm_hv_has_stimer_pending(vcpu))
12648 if (is_guest_mode(vcpu) &&
12649 kvm_x86_ops.nested_ops->has_events &&
12650 kvm_x86_ops.nested_ops->has_events(vcpu))
12653 if (kvm_xen_has_pending_events(vcpu))
12659 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
12661 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
12664 bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu)
12666 if (kvm_vcpu_apicv_active(vcpu) &&
12667 static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu))
12673 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
12675 if (READ_ONCE(vcpu->arch.pv.pv_unhalted))
12678 if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
12679 #ifdef CONFIG_KVM_SMM
12680 kvm_test_request(KVM_REQ_SMI, vcpu) ||
12682 kvm_test_request(KVM_REQ_EVENT, vcpu))
12685 return kvm_arch_dy_has_pending_interrupt(vcpu);
12688 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
12690 if (vcpu->arch.guest_state_protected)
12693 return vcpu->arch.preempted_in_kernel;
12696 unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
12698 return kvm_rip_read(vcpu);
12701 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
12703 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
12706 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
12708 return static_call(kvm_x86_interrupt_allowed)(vcpu, false);
12711 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu)
12713 /* Can't read the RIP when guest state is protected, just return 0 */
12714 if (vcpu->arch.guest_state_protected)
12717 if (is_64_bit_mode(vcpu))
12718 return kvm_rip_read(vcpu);
12719 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) +
12720 kvm_rip_read(vcpu));
12722 EXPORT_SYMBOL_GPL(kvm_get_linear_rip);
12724 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
12726 return kvm_get_linear_rip(vcpu) == linear_rip;
12728 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
12730 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
12732 unsigned long rflags;
12734 rflags = static_call(kvm_x86_get_rflags)(vcpu);
12735 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
12736 rflags &= ~X86_EFLAGS_TF;
12739 EXPORT_SYMBOL_GPL(kvm_get_rflags);
12741 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
12743 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
12744 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
12745 rflags |= X86_EFLAGS_TF;
12746 static_call(kvm_x86_set_rflags)(vcpu, rflags);
12749 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
12751 __kvm_set_rflags(vcpu, rflags);
12752 kvm_make_request(KVM_REQ_EVENT, vcpu);
12754 EXPORT_SYMBOL_GPL(kvm_set_rflags);
12756 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
12758 BUILD_BUG_ON(!is_power_of_2(ASYNC_PF_PER_VCPU));
12760 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
12763 static inline u32 kvm_async_pf_next_probe(u32 key)
12765 return (key + 1) & (ASYNC_PF_PER_VCPU - 1);
12768 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
12770 u32 key = kvm_async_pf_hash_fn(gfn);
12772 while (vcpu->arch.apf.gfns[key] != ~0)
12773 key = kvm_async_pf_next_probe(key);
12775 vcpu->arch.apf.gfns[key] = gfn;
12778 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
12781 u32 key = kvm_async_pf_hash_fn(gfn);
12783 for (i = 0; i < ASYNC_PF_PER_VCPU &&
12784 (vcpu->arch.apf.gfns[key] != gfn &&
12785 vcpu->arch.apf.gfns[key] != ~0); i++)
12786 key = kvm_async_pf_next_probe(key);
12791 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
12793 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
12796 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
12800 i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
12802 if (WARN_ON_ONCE(vcpu->arch.apf.gfns[i] != gfn))
12806 vcpu->arch.apf.gfns[i] = ~0;
12808 j = kvm_async_pf_next_probe(j);
12809 if (vcpu->arch.apf.gfns[j] == ~0)
12811 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
12813 * k lies cyclically in ]i,j]
12815 * |....j i.k.| or |.k..j i...|
12817 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
12818 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
12823 static inline int apf_put_user_notpresent(struct kvm_vcpu *vcpu)
12825 u32 reason = KVM_PV_REASON_PAGE_NOT_PRESENT;
12827 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &reason,
12831 static inline int apf_put_user_ready(struct kvm_vcpu *vcpu, u32 token)
12833 unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token);
12835 return kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data,
12836 &token, offset, sizeof(token));
12839 static inline bool apf_pageready_slot_free(struct kvm_vcpu *vcpu)
12841 unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token);
12844 if (kvm_read_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data,
12845 &val, offset, sizeof(val)))
12851 static bool kvm_can_deliver_async_pf(struct kvm_vcpu *vcpu)
12854 if (!kvm_pv_async_pf_enabled(vcpu))
12857 if (vcpu->arch.apf.send_user_only &&
12858 static_call(kvm_x86_get_cpl)(vcpu) == 0)
12861 if (is_guest_mode(vcpu)) {
12863 * L1 needs to opt into the special #PF vmexits that are
12864 * used to deliver async page faults.
12866 return vcpu->arch.apf.delivery_as_pf_vmexit;
12869 * Play it safe in case the guest temporarily disables paging.
12870 * The real mode IDT in particular is unlikely to have a #PF
12873 return is_paging(vcpu);
12877 bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu)
12879 if (unlikely(!lapic_in_kernel(vcpu) ||
12880 kvm_event_needs_reinjection(vcpu) ||
12881 kvm_is_exception_pending(vcpu)))
12884 if (kvm_hlt_in_guest(vcpu->kvm) && !kvm_can_deliver_async_pf(vcpu))
12888 * If interrupts are off we cannot even use an artificial
12891 return kvm_arch_interrupt_allowed(vcpu);
12894 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
12895 struct kvm_async_pf *work)
12897 struct x86_exception fault;
12899 trace_kvm_async_pf_not_present(work->arch.token, work->cr2_or_gpa);
12900 kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
12902 if (kvm_can_deliver_async_pf(vcpu) &&
12903 !apf_put_user_notpresent(vcpu)) {
12904 fault.vector = PF_VECTOR;
12905 fault.error_code_valid = true;
12906 fault.error_code = 0;
12907 fault.nested_page_fault = false;
12908 fault.address = work->arch.token;
12909 fault.async_page_fault = true;
12910 kvm_inject_page_fault(vcpu, &fault);
12914 * It is not possible to deliver a paravirtualized asynchronous
12915 * page fault, but putting the guest in an artificial halt state
12916 * can be beneficial nevertheless: if an interrupt arrives, we
12917 * can deliver it timely and perhaps the guest will schedule
12918 * another process. When the instruction that triggered a page
12919 * fault is retried, hopefully the page will be ready in the host.
12921 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
12926 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
12927 struct kvm_async_pf *work)
12929 struct kvm_lapic_irq irq = {
12930 .delivery_mode = APIC_DM_FIXED,
12931 .vector = vcpu->arch.apf.vec
12934 if (work->wakeup_all)
12935 work->arch.token = ~0; /* broadcast wakeup */
12937 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
12938 trace_kvm_async_pf_ready(work->arch.token, work->cr2_or_gpa);
12940 if ((work->wakeup_all || work->notpresent_injected) &&
12941 kvm_pv_async_pf_enabled(vcpu) &&
12942 !apf_put_user_ready(vcpu, work->arch.token)) {
12943 vcpu->arch.apf.pageready_pending = true;
12944 kvm_apic_set_irq(vcpu, &irq, NULL);
12947 vcpu->arch.apf.halted = false;
12948 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
12951 void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu)
12953 kvm_make_request(KVM_REQ_APF_READY, vcpu);
12954 if (!vcpu->arch.apf.pageready_pending)
12955 kvm_vcpu_kick(vcpu);
12958 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
12960 if (!kvm_pv_async_pf_enabled(vcpu))
12963 return kvm_lapic_enabled(vcpu) && apf_pageready_slot_free(vcpu);
12966 void kvm_arch_start_assignment(struct kvm *kvm)
12968 if (atomic_inc_return(&kvm->arch.assigned_device_count) == 1)
12969 static_call_cond(kvm_x86_pi_start_assignment)(kvm);
12971 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment);
12973 void kvm_arch_end_assignment(struct kvm *kvm)
12975 atomic_dec(&kvm->arch.assigned_device_count);
12977 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment);
12979 bool noinstr kvm_arch_has_assigned_device(struct kvm *kvm)
12981 return arch_atomic_read(&kvm->arch.assigned_device_count);
12983 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device);
12985 void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
12987 atomic_inc(&kvm->arch.noncoherent_dma_count);
12989 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma);
12991 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
12993 atomic_dec(&kvm->arch.noncoherent_dma_count);
12995 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma);
12997 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
12999 return atomic_read(&kvm->arch.noncoherent_dma_count);
13001 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
13003 bool kvm_arch_has_irq_bypass(void)
13008 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
13009 struct irq_bypass_producer *prod)
13011 struct kvm_kernel_irqfd *irqfd =
13012 container_of(cons, struct kvm_kernel_irqfd, consumer);
13015 irqfd->producer = prod;
13016 kvm_arch_start_assignment(irqfd->kvm);
13017 ret = static_call(kvm_x86_pi_update_irte)(irqfd->kvm,
13018 prod->irq, irqfd->gsi, 1);
13021 kvm_arch_end_assignment(irqfd->kvm);
13026 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
13027 struct irq_bypass_producer *prod)
13030 struct kvm_kernel_irqfd *irqfd =
13031 container_of(cons, struct kvm_kernel_irqfd, consumer);
13033 WARN_ON(irqfd->producer != prod);
13034 irqfd->producer = NULL;
13037 * When producer of consumer is unregistered, we change back to
13038 * remapped mode, so we can re-use the current implementation
13039 * when the irq is masked/disabled or the consumer side (KVM
13040 * int this case doesn't want to receive the interrupts.
13042 ret = static_call(kvm_x86_pi_update_irte)(irqfd->kvm, prod->irq, irqfd->gsi, 0);
13044 printk(KERN_INFO "irq bypass consumer (token %p) unregistration"
13045 " fails: %d\n", irqfd->consumer.token, ret);
13047 kvm_arch_end_assignment(irqfd->kvm);
13050 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
13051 uint32_t guest_irq, bool set)
13053 return static_call(kvm_x86_pi_update_irte)(kvm, host_irq, guest_irq, set);
13056 bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *old,
13057 struct kvm_kernel_irq_routing_entry *new)
13059 if (new->type != KVM_IRQ_ROUTING_MSI)
13062 return !!memcmp(&old->msi, &new->msi, sizeof(new->msi));
13065 bool kvm_vector_hashing_enabled(void)
13067 return vector_hashing;
13070 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
13072 return (vcpu->arch.msr_kvm_poll_control & 1) == 0;
13074 EXPORT_SYMBOL_GPL(kvm_arch_no_poll);
13077 int kvm_spec_ctrl_test_value(u64 value)
13080 * test that setting IA32_SPEC_CTRL to given value
13081 * is allowed by the host processor
13085 unsigned long flags;
13088 local_irq_save(flags);
13090 if (rdmsrl_safe(MSR_IA32_SPEC_CTRL, &saved_value))
13092 else if (wrmsrl_safe(MSR_IA32_SPEC_CTRL, value))
13095 wrmsrl(MSR_IA32_SPEC_CTRL, saved_value);
13097 local_irq_restore(flags);
13101 EXPORT_SYMBOL_GPL(kvm_spec_ctrl_test_value);
13103 void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_code)
13105 struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
13106 struct x86_exception fault;
13107 u64 access = error_code &
13108 (PFERR_WRITE_MASK | PFERR_FETCH_MASK | PFERR_USER_MASK);
13110 if (!(error_code & PFERR_PRESENT_MASK) ||
13111 mmu->gva_to_gpa(vcpu, mmu, gva, access, &fault) != INVALID_GPA) {
13113 * If vcpu->arch.walk_mmu->gva_to_gpa succeeded, the page
13114 * tables probably do not match the TLB. Just proceed
13115 * with the error code that the processor gave.
13117 fault.vector = PF_VECTOR;
13118 fault.error_code_valid = true;
13119 fault.error_code = error_code;
13120 fault.nested_page_fault = false;
13121 fault.address = gva;
13122 fault.async_page_fault = false;
13124 vcpu->arch.walk_mmu->inject_page_fault(vcpu, &fault);
13126 EXPORT_SYMBOL_GPL(kvm_fixup_and_inject_pf_error);
13129 * Handles kvm_read/write_guest_virt*() result and either injects #PF or returns
13130 * KVM_EXIT_INTERNAL_ERROR for cases not currently handled by KVM. Return value
13131 * indicates whether exit to userspace is needed.
13133 int kvm_handle_memory_failure(struct kvm_vcpu *vcpu, int r,
13134 struct x86_exception *e)
13136 if (r == X86EMUL_PROPAGATE_FAULT) {
13137 if (KVM_BUG_ON(!e, vcpu->kvm))
13140 kvm_inject_emulated_page_fault(vcpu, e);
13145 * In case kvm_read/write_guest_virt*() failed with X86EMUL_IO_NEEDED
13146 * while handling a VMX instruction KVM could've handled the request
13147 * correctly by exiting to userspace and performing I/O but there
13148 * doesn't seem to be a real use-case behind such requests, just return
13149 * KVM_EXIT_INTERNAL_ERROR for now.
13151 kvm_prepare_emulation_failure_exit(vcpu);
13155 EXPORT_SYMBOL_GPL(kvm_handle_memory_failure);
13157 int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
13160 struct x86_exception e;
13167 r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
13168 if (r != X86EMUL_CONTINUE)
13169 return kvm_handle_memory_failure(vcpu, r, &e);
13171 if (operand.pcid >> 12 != 0) {
13172 kvm_inject_gp(vcpu, 0);
13176 pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE);
13179 case INVPCID_TYPE_INDIV_ADDR:
13180 if ((!pcid_enabled && (operand.pcid != 0)) ||
13181 is_noncanonical_address(operand.gla, vcpu)) {
13182 kvm_inject_gp(vcpu, 0);
13185 kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid);
13186 return kvm_skip_emulated_instruction(vcpu);
13188 case INVPCID_TYPE_SINGLE_CTXT:
13189 if (!pcid_enabled && (operand.pcid != 0)) {
13190 kvm_inject_gp(vcpu, 0);
13194 kvm_invalidate_pcid(vcpu, operand.pcid);
13195 return kvm_skip_emulated_instruction(vcpu);
13197 case INVPCID_TYPE_ALL_NON_GLOBAL:
13199 * Currently, KVM doesn't mark global entries in the shadow
13200 * page tables, so a non-global flush just degenerates to a
13201 * global flush. If needed, we could optimize this later by
13202 * keeping track of global entries in shadow page tables.
13206 case INVPCID_TYPE_ALL_INCL_GLOBAL:
13207 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
13208 return kvm_skip_emulated_instruction(vcpu);
13211 kvm_inject_gp(vcpu, 0);
13215 EXPORT_SYMBOL_GPL(kvm_handle_invpcid);
13217 static int complete_sev_es_emulated_mmio(struct kvm_vcpu *vcpu)
13219 struct kvm_run *run = vcpu->run;
13220 struct kvm_mmio_fragment *frag;
13223 BUG_ON(!vcpu->mmio_needed);
13225 /* Complete previous fragment */
13226 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
13227 len = min(8u, frag->len);
13228 if (!vcpu->mmio_is_write)
13229 memcpy(frag->data, run->mmio.data, len);
13231 if (frag->len <= 8) {
13232 /* Switch to the next fragment. */
13234 vcpu->mmio_cur_fragment++;
13236 /* Go forward to the next mmio piece. */
13242 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
13243 vcpu->mmio_needed = 0;
13245 // VMG change, at this point, we're always done
13246 // RIP has already been advanced
13250 // More MMIO is needed
13251 run->mmio.phys_addr = frag->gpa;
13252 run->mmio.len = min(8u, frag->len);
13253 run->mmio.is_write = vcpu->mmio_is_write;
13254 if (run->mmio.is_write)
13255 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
13256 run->exit_reason = KVM_EXIT_MMIO;
13258 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
13263 int kvm_sev_es_mmio_write(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes,
13267 struct kvm_mmio_fragment *frag;
13272 handled = write_emultor.read_write_mmio(vcpu, gpa, bytes, data);
13273 if (handled == bytes)
13280 /*TODO: Check if need to increment number of frags */
13281 frag = vcpu->mmio_fragments;
13282 vcpu->mmio_nr_fragments = 1;
13287 vcpu->mmio_needed = 1;
13288 vcpu->mmio_cur_fragment = 0;
13290 vcpu->run->mmio.phys_addr = gpa;
13291 vcpu->run->mmio.len = min(8u, frag->len);
13292 vcpu->run->mmio.is_write = 1;
13293 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
13294 vcpu->run->exit_reason = KVM_EXIT_MMIO;
13296 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
13300 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_write);
13302 int kvm_sev_es_mmio_read(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes,
13306 struct kvm_mmio_fragment *frag;
13311 handled = read_emultor.read_write_mmio(vcpu, gpa, bytes, data);
13312 if (handled == bytes)
13319 /*TODO: Check if need to increment number of frags */
13320 frag = vcpu->mmio_fragments;
13321 vcpu->mmio_nr_fragments = 1;
13326 vcpu->mmio_needed = 1;
13327 vcpu->mmio_cur_fragment = 0;
13329 vcpu->run->mmio.phys_addr = gpa;
13330 vcpu->run->mmio.len = min(8u, frag->len);
13331 vcpu->run->mmio.is_write = 0;
13332 vcpu->run->exit_reason = KVM_EXIT_MMIO;
13334 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio;
13338 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_read);
13340 static void advance_sev_es_emulated_pio(struct kvm_vcpu *vcpu, unsigned count, int size)
13342 vcpu->arch.sev_pio_count -= count;
13343 vcpu->arch.sev_pio_data += count * size;
13346 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
13347 unsigned int port);
13349 static int complete_sev_es_emulated_outs(struct kvm_vcpu *vcpu)
13351 int size = vcpu->arch.pio.size;
13352 int port = vcpu->arch.pio.port;
13354 vcpu->arch.pio.count = 0;
13355 if (vcpu->arch.sev_pio_count)
13356 return kvm_sev_es_outs(vcpu, size, port);
13360 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
13364 unsigned int count =
13365 min_t(unsigned int, PAGE_SIZE / size, vcpu->arch.sev_pio_count);
13366 int ret = emulator_pio_out(vcpu, size, port, vcpu->arch.sev_pio_data, count);
13368 /* memcpy done already by emulator_pio_out. */
13369 advance_sev_es_emulated_pio(vcpu, count, size);
13373 /* Emulation done by the kernel. */
13374 if (!vcpu->arch.sev_pio_count)
13378 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_outs;
13382 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
13383 unsigned int port);
13385 static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu)
13387 unsigned count = vcpu->arch.pio.count;
13388 int size = vcpu->arch.pio.size;
13389 int port = vcpu->arch.pio.port;
13391 complete_emulator_pio_in(vcpu, vcpu->arch.sev_pio_data);
13392 advance_sev_es_emulated_pio(vcpu, count, size);
13393 if (vcpu->arch.sev_pio_count)
13394 return kvm_sev_es_ins(vcpu, size, port);
13398 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
13402 unsigned int count =
13403 min_t(unsigned int, PAGE_SIZE / size, vcpu->arch.sev_pio_count);
13404 if (!emulator_pio_in(vcpu, size, port, vcpu->arch.sev_pio_data, count))
13407 /* Emulation done by the kernel. */
13408 advance_sev_es_emulated_pio(vcpu, count, size);
13409 if (!vcpu->arch.sev_pio_count)
13413 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_ins;
13417 int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size,
13418 unsigned int port, void *data, unsigned int count,
13421 vcpu->arch.sev_pio_data = data;
13422 vcpu->arch.sev_pio_count = count;
13423 return in ? kvm_sev_es_ins(vcpu, size, port)
13424 : kvm_sev_es_outs(vcpu, size, port);
13426 EXPORT_SYMBOL_GPL(kvm_sev_es_string_io);
13428 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_entry);
13429 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
13430 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
13431 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
13432 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
13433 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
13434 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
13435 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter);
13436 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
13437 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
13438 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
13439 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed);
13440 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
13441 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
13442 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
13443 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
13444 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window_update);
13445 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
13446 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
13447 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
13448 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
13449 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
13450 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_kick_vcpu_slowpath);
13451 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_doorbell);
13452 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_accept_irq);
13453 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
13454 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
13455 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter);
13456 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit);
13458 static int __init kvm_x86_init(void)
13460 kvm_mmu_x86_module_init();
13463 module_init(kvm_x86_init);
13465 static void __exit kvm_x86_exit(void)
13468 * If module_init() is implemented, module_exit() must also be
13469 * implemented to allow module unload.
13472 module_exit(kvm_x86_exit);