arch/arm64/include/asm/kvm_host.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012,2013 - ARM Ltd
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  *
   6  * Derived from arch/arm/include/asm/kvm_host.h:
   7  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   8  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   9  */
  10
  11 #ifndef __ARM64_KVM_HOST_H__
  12 #define __ARM64_KVM_HOST_H__
  13
  14 #include <linux/arm-smccc.h>
  15 #include <linux/bitmap.h>
  16 #include <linux/types.h>
  17 #include <linux/jump_label.h>
  18 #include <linux/kvm_types.h>
  19 #include <linux/percpu.h>
  20 #include <linux/psci.h>
  21 #include <asm/arch_gicv3.h>
  22 #include <asm/barrier.h>
  23 #include <asm/cpufeature.h>
  24 #include <asm/cputype.h>
  25 #include <asm/daifflags.h>
  26 #include <asm/fpsimd.h>
  27 #include <asm/kvm.h>
  28 #include <asm/kvm_asm.h>
  29
  30 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  31
  32 #define KVM_HALT_POLL_NS_DEFAULT 500000
  33
  34 #include <kvm/arm_vgic.h>
  35 #include <kvm/arm_arch_timer.h>
  36 #include <kvm/arm_pmu.h>
  37
  38 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  39
  40 #define KVM_VCPU_MAX_FEATURES 7
  41
  42 #define KVM_REQ_SLEEP \
  43         KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  44 #define KVM_REQ_IRQ_PENDING     KVM_ARCH_REQ(1)
  45 #define KVM_REQ_VCPU_RESET      KVM_ARCH_REQ(2)
  46 #define KVM_REQ_RECORD_STEAL    KVM_ARCH_REQ(3)
  47 #define KVM_REQ_RELOAD_GICv4    KVM_ARCH_REQ(4)
  48 #define KVM_REQ_RELOAD_PMU      KVM_ARCH_REQ(5)
  49 #define KVM_REQ_SUSPEND         KVM_ARCH_REQ(6)
  50
  51 #define KVM_DIRTY_LOG_MANUAL_CAPS   (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
  52                                      KVM_DIRTY_LOG_INITIALLY_SET)
  53
  54 #define KVM_HAVE_MMU_RWLOCK
  55
  56 /*
  57  * Mode of operation configurable with kvm-arm.mode early param.
  58  * See Documentation/admin-guide/kernel-parameters.txt for more information.
  59  */
  60 enum kvm_mode {
  61         KVM_MODE_DEFAULT,
  62         KVM_MODE_PROTECTED,
  63         KVM_MODE_NONE,
  64 };
  65 enum kvm_mode kvm_get_mode(void);
  66
  67 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
  68
  69 extern unsigned int kvm_sve_max_vl;
  70 int kvm_arm_init_sve(void);
  71
  72 u32 __attribute_const__ kvm_target_cpu(void);
  73 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  74 void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
  75
  76 struct kvm_vmid {
  77         atomic64_t id;
  78 };
  79
  80 struct kvm_s2_mmu {
  81         struct kvm_vmid vmid;
  82
  83         /*
  84          * stage2 entry level table
  85          *
  86          * Two kvm_s2_mmu structures in the same VM can point to the same
  87          * pgd here.  This happens when running a guest using a
  88          * translation regime that isn't affected by its own stage-2
  89          * translation, such as a non-VHE hypervisor running at vEL2, or
  90          * for vEL1/EL0 with vHCR_EL2.VM == 0.  In that case, we use the
  91          * canonical stage-2 page tables.
  92          */
  93         phys_addr_t     pgd_phys;
  94         struct kvm_pgtable *pgt;
  95
  96         /* The last vcpu id that ran on each physical CPU */
  97         int __percpu *last_vcpu_ran;
  98
  99         struct kvm_arch *arch;
 100 };
 101
 102 struct kvm_arch_memory_slot {
 103 };
 104
 105 /**
 106  * struct kvm_smccc_features: Descriptor of the hypercall services exposed to the guests
 107  *
 108  * @std_bmap: Bitmap of standard secure service calls
 109  * @std_hyp_bmap: Bitmap of standard hypervisor service calls
 110  * @vendor_hyp_bmap: Bitmap of vendor specific hypervisor service calls
 111  */
 112 struct kvm_smccc_features {
 113         unsigned long std_bmap;
 114         unsigned long std_hyp_bmap;
 115         unsigned long vendor_hyp_bmap;
 116 };
 117
 118 struct kvm_arch {
 119         struct kvm_s2_mmu mmu;
 120
 121         /* VTCR_EL2 value for this VM */
 122         u64    vtcr;
 123
 124         /* Interrupt controller */
 125         struct vgic_dist        vgic;
 126
 127         /* Mandated version of PSCI */
 128         u32 psci_version;
 129
 130         /*
 131          * If we encounter a data abort without valid instruction syndrome
 132          * information, report this to user space.  User space can (and
 133          * should) opt in to this feature if KVM_CAP_ARM_NISV_TO_USER is
 134          * supported.
 135          */
 136 #define KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER      0
 137         /* Memory Tagging Extension enabled for the guest */
 138 #define KVM_ARCH_FLAG_MTE_ENABLED                       1
 139         /* At least one vCPU has ran in the VM */
 140 #define KVM_ARCH_FLAG_HAS_RAN_ONCE                      2
 141         /*
 142          * The following two bits are used to indicate the guest's EL1
 143          * register width configuration. A value of KVM_ARCH_FLAG_EL1_32BIT
 144          * bit is valid only when KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED is set.
 145          * Otherwise, the guest's EL1 register width has not yet been
 146          * determined yet.
 147          */
 148 #define KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED              3
 149 #define KVM_ARCH_FLAG_EL1_32BIT                         4
 150         /* PSCI SYSTEM_SUSPEND enabled for the guest */
 151 #define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED            5
 152
 153         unsigned long flags;
 154
 155         /*
 156          * VM-wide PMU filter, implemented as a bitmap and big enough for
 157          * up to 2^10 events (ARMv8.0) or 2^16 events (ARMv8.1+).
 158          */
 159         unsigned long *pmu_filter;
 160         struct arm_pmu *arm_pmu;
 161
 162         cpumask_var_t supported_cpus;
 163
 164         u8 pfr0_csv2;
 165         u8 pfr0_csv3;
 166
 167         /* Hypercall features firmware registers' descriptor */
 168         struct kvm_smccc_features smccc_feat;
 169 };
 170
 171 struct kvm_vcpu_fault_info {
 172         u64 esr_el2;            /* Hyp Syndrom Register */
 173         u64 far_el2;            /* Hyp Fault Address Register */
 174         u64 hpfar_el2;          /* Hyp IPA Fault Address Register */
 175         u64 disr_el1;           /* Deferred [SError] Status Register */
 176 };
 177
 178 enum vcpu_sysreg {
 179         __INVALID_SYSREG__,   /* 0 is reserved as an invalid value */
 180         MPIDR_EL1,      /* MultiProcessor Affinity Register */
 181         CSSELR_EL1,     /* Cache Size Selection Register */
 182         SCTLR_EL1,      /* System Control Register */
 183         ACTLR_EL1,      /* Auxiliary Control Register */
 184         CPACR_EL1,      /* Coprocessor Access Control */
 185         ZCR_EL1,        /* SVE Control */
 186         TTBR0_EL1,      /* Translation Table Base Register 0 */
 187         TTBR1_EL1,      /* Translation Table Base Register 1 */
 188         TCR_EL1,        /* Translation Control Register */
 189         ESR_EL1,        /* Exception Syndrome Register */
 190         AFSR0_EL1,      /* Auxiliary Fault Status Register 0 */
 191         AFSR1_EL1,      /* Auxiliary Fault Status Register 1 */
 192         FAR_EL1,        /* Fault Address Register */
 193         MAIR_EL1,       /* Memory Attribute Indirection Register */
 194         VBAR_EL1,       /* Vector Base Address Register */
 195         CONTEXTIDR_EL1, /* Context ID Register */
 196         TPIDR_EL0,      /* Thread ID, User R/W */
 197         TPIDRRO_EL0,    /* Thread ID, User R/O */
 198         TPIDR_EL1,      /* Thread ID, Privileged */
 199         AMAIR_EL1,      /* Aux Memory Attribute Indirection Register */
 200         CNTKCTL_EL1,    /* Timer Control Register (EL1) */
 201         PAR_EL1,        /* Physical Address Register */
 202         MDSCR_EL1,      /* Monitor Debug System Control Register */
 203         MDCCINT_EL1,    /* Monitor Debug Comms Channel Interrupt Enable Reg */
 204         OSLSR_EL1,      /* OS Lock Status Register */
 205         DISR_EL1,       /* Deferred Interrupt Status Register */
 206
 207         /* Performance Monitors Registers */
 208         PMCR_EL0,       /* Control Register */
 209         PMSELR_EL0,     /* Event Counter Selection Register */
 210         PMEVCNTR0_EL0,  /* Event Counter Register (0-30) */
 211         PMEVCNTR30_EL0 = PMEVCNTR0_EL0 + 30,
 212         PMCCNTR_EL0,    /* Cycle Counter Register */
 213         PMEVTYPER0_EL0, /* Event Type Register (0-30) */
 214         PMEVTYPER30_EL0 = PMEVTYPER0_EL0 + 30,
 215         PMCCFILTR_EL0,  /* Cycle Count Filter Register */
 216         PMCNTENSET_EL0, /* Count Enable Set Register */
 217         PMINTENSET_EL1, /* Interrupt Enable Set Register */
 218         PMOVSSET_EL0,   /* Overflow Flag Status Set Register */
 219         PMUSERENR_EL0,  /* User Enable Register */
 220
 221         /* Pointer Authentication Registers in a strict increasing order. */
 222         APIAKEYLO_EL1,
 223         APIAKEYHI_EL1,
 224         APIBKEYLO_EL1,
 225         APIBKEYHI_EL1,
 226         APDAKEYLO_EL1,
 227         APDAKEYHI_EL1,
 228         APDBKEYLO_EL1,
 229         APDBKEYHI_EL1,
 230         APGAKEYLO_EL1,
 231         APGAKEYHI_EL1,
 232
 233         ELR_EL1,
 234         SP_EL1,
 235         SPSR_EL1,
 236
 237         CNTVOFF_EL2,
 238         CNTV_CVAL_EL0,
 239         CNTV_CTL_EL0,
 240         CNTP_CVAL_EL0,
 241         CNTP_CTL_EL0,
 242
 243         /* Memory Tagging Extension registers */
 244         RGSR_EL1,       /* Random Allocation Tag Seed Register */
 245         GCR_EL1,        /* Tag Control Register */
 246         TFSR_EL1,       /* Tag Fault Status Register (EL1) */
 247         TFSRE0_EL1,     /* Tag Fault Status Register (EL0) */
 248
 249         /* 32bit specific registers. Keep them at the end of the range */
 250         DACR32_EL2,     /* Domain Access Control Register */
 251         IFSR32_EL2,     /* Instruction Fault Status Register */
 252         FPEXC32_EL2,    /* Floating-Point Exception Control Register */
 253         DBGVCR32_EL2,   /* Debug Vector Catch Register */
 254
 255         NR_SYS_REGS     /* Nothing after this line! */
 256 };
 257
 258 struct kvm_cpu_context {
 259         struct user_pt_regs regs;       /* sp = sp_el0 */
 260
 261         u64     spsr_abt;
 262         u64     spsr_und;
 263         u64     spsr_irq;
 264         u64     spsr_fiq;
 265
 266         struct user_fpsimd_state fp_regs;
 267
 268         u64 sys_regs[NR_SYS_REGS];
 269
 270         struct kvm_vcpu *__hyp_running_vcpu;
 271 };
 272
 273 struct kvm_host_data {
 274         struct kvm_cpu_context host_ctxt;
 275 };
 276
 277 struct kvm_host_psci_config {
 278         /* PSCI version used by host. */
 279         u32 version;
 280
 281         /* Function IDs used by host if version is v0.1. */
 282         struct psci_0_1_function_ids function_ids_0_1;
 283
 284         bool psci_0_1_cpu_suspend_implemented;
 285         bool psci_0_1_cpu_on_implemented;
 286         bool psci_0_1_cpu_off_implemented;
 287         bool psci_0_1_migrate_implemented;
 288 };
 289
 290 extern struct kvm_host_psci_config kvm_nvhe_sym(kvm_host_psci_config);
 291 #define kvm_host_psci_config CHOOSE_NVHE_SYM(kvm_host_psci_config)
 292
 293 extern s64 kvm_nvhe_sym(hyp_physvirt_offset);
 294 #define hyp_physvirt_offset CHOOSE_NVHE_SYM(hyp_physvirt_offset)
 295
 296 extern u64 kvm_nvhe_sym(hyp_cpu_logical_map)[NR_CPUS];
 297 #define hyp_cpu_logical_map CHOOSE_NVHE_SYM(hyp_cpu_logical_map)
 298
 299 struct vcpu_reset_state {
 300         unsigned long   pc;
 301         unsigned long   r0;
 302         bool            be;
 303         bool            reset;
 304 };
 305
 306 struct kvm_vcpu_arch {
 307         struct kvm_cpu_context ctxt;
 308
 309         /* Guest floating point state */
 310         void *sve_state;
 311         unsigned int sve_max_vl;
 312         u64 svcr;
 313
 314         /* Stage 2 paging state used by the hardware on next switch */
 315         struct kvm_s2_mmu *hw_mmu;
 316
 317         /* Values of trap registers for the guest. */
 318         u64 hcr_el2;
 319         u64 mdcr_el2;
 320         u64 cptr_el2;
 321
 322         /* Values of trap registers for the host before guest entry. */
 323         u64 mdcr_el2_host;
 324
 325         /* Exception Information */
 326         struct kvm_vcpu_fault_info fault;
 327
 328         /* Miscellaneous vcpu state flags */
 329         u64 flags;
 330
 331         /*
 332          * We maintain more than a single set of debug registers to support
 333          * debugging the guest from the host and to maintain separate host and
 334          * guest state during world switches. vcpu_debug_state are the debug
 335          * registers of the vcpu as the guest sees them.  host_debug_state are
 336          * the host registers which are saved and restored during
 337          * world switches. external_debug_state contains the debug
 338          * values we want to debug the guest. This is set via the
 339          * KVM_SET_GUEST_DEBUG ioctl.
 340          *
 341          * debug_ptr points to the set of debug registers that should be loaded
 342          * onto the hardware when running the guest.
 343          */
 344         struct kvm_guest_debug_arch *debug_ptr;
 345         struct kvm_guest_debug_arch vcpu_debug_state;
 346         struct kvm_guest_debug_arch external_debug_state;
 347
 348         struct user_fpsimd_state *host_fpsimd_state;    /* hyp VA */
 349         struct task_struct *parent_task;
 350
 351         struct {
 352                 /* {Break,watch}point registers */
 353                 struct kvm_guest_debug_arch regs;
 354                 /* Statistical profiling extension */
 355                 u64 pmscr_el1;
 356                 /* Self-hosted trace */
 357                 u64 trfcr_el1;
 358         } host_debug_state;
 359
 360         /* VGIC state */
 361         struct vgic_cpu vgic_cpu;
 362         struct arch_timer_cpu timer_cpu;
 363         struct kvm_pmu pmu;
 364
 365         /*
 366          * Guest registers we preserve during guest debugging.
 367          *
 368          * These shadow registers are updated by the kvm_handle_sys_reg
 369          * trap handler if the guest accesses or updates them while we
 370          * are using guest debug.
 371          */
 372         struct {
 373                 u32     mdscr_el1;
 374         } guest_debug_preserved;
 375
 376         /* vcpu power state */
 377         struct kvm_mp_state mp_state;
 378
 379         /* Don't run the guest (internal implementation need) */
 380         bool pause;
 381
 382         /* Cache some mmu pages needed inside spinlock regions */
 383         struct kvm_mmu_memory_cache mmu_page_cache;
 384
 385         /* Target CPU and feature flags */
 386         int target;
 387         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 388
 389         /* Virtual SError ESR to restore when HCR_EL2.VSE is set */
 390         u64 vsesr_el2;
 391
 392         /* Additional reset state */
 393         struct vcpu_reset_state reset_state;
 394
 395         /* True when deferrable sysregs are loaded on the physical CPU,
 396          * see kvm_vcpu_load_sysregs_vhe and kvm_vcpu_put_sysregs_vhe. */
 397         bool sysregs_loaded_on_cpu;
 398
 399         /* Guest PV state */
 400         struct {
 401                 u64 last_steal;
 402                 gpa_t base;
 403         } steal;
 404 };
 405
 406 /* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
 407 #define vcpu_sve_pffr(vcpu) (kern_hyp_va((vcpu)->arch.sve_state) +      \
 408                              sve_ffr_offset((vcpu)->arch.sve_max_vl))
 409
 410 #define vcpu_sve_max_vq(vcpu)   sve_vq_from_vl((vcpu)->arch.sve_max_vl)
 411
 412 #define vcpu_sve_state_size(vcpu) ({                                    \
 413         size_t __size_ret;                                              \
 414         unsigned int __vcpu_vq;                                         \
 415                                                                         \
 416         if (WARN_ON(!sve_vl_valid((vcpu)->arch.sve_max_vl))) {          \
 417                 __size_ret = 0;                                         \
 418         } else {                                                        \
 419                 __vcpu_vq = vcpu_sve_max_vq(vcpu);                      \
 420                 __size_ret = SVE_SIG_REGS_SIZE(__vcpu_vq);              \
 421         }                                                               \
 422                                                                         \
 423         __size_ret;                                                     \
 424 })
 425
 426 /* vcpu_arch flags field values: */
 427 #define KVM_ARM64_DEBUG_DIRTY           (1 << 0)
 428 #define KVM_ARM64_FP_ENABLED            (1 << 1) /* guest FP regs loaded */
 429 #define KVM_ARM64_FP_HOST               (1 << 2) /* host FP regs loaded */
 430 #define KVM_ARM64_HOST_SVE_ENABLED      (1 << 4) /* SVE enabled for EL0 */
 431 #define KVM_ARM64_GUEST_HAS_SVE         (1 << 5) /* SVE exposed to guest */
 432 #define KVM_ARM64_VCPU_SVE_FINALIZED    (1 << 6) /* SVE config completed */
 433 #define KVM_ARM64_GUEST_HAS_PTRAUTH     (1 << 7) /* PTRAUTH exposed to guest */
 434 #define KVM_ARM64_PENDING_EXCEPTION     (1 << 8) /* Exception pending */
 435 /*
 436  * Overlaps with KVM_ARM64_EXCEPT_MASK on purpose so that it can't be
 437  * set together with an exception...
 438  */
 439 #define KVM_ARM64_INCREMENT_PC          (1 << 9) /* Increment PC */
 440 #define KVM_ARM64_EXCEPT_MASK           (7 << 9) /* Target EL/MODE */
 441 /*
 442  * When KVM_ARM64_PENDING_EXCEPTION is set, KVM_ARM64_EXCEPT_MASK can
 443  * take the following values:
 444  *
 445  * For AArch32 EL1:
 446  */
 447 #define KVM_ARM64_EXCEPT_AA32_UND       (0 << 9)
 448 #define KVM_ARM64_EXCEPT_AA32_IABT      (1 << 9)
 449 #define KVM_ARM64_EXCEPT_AA32_DABT      (2 << 9)
 450 /* For AArch64: */
 451 #define KVM_ARM64_EXCEPT_AA64_ELx_SYNC  (0 << 9)
 452 #define KVM_ARM64_EXCEPT_AA64_ELx_IRQ   (1 << 9)
 453 #define KVM_ARM64_EXCEPT_AA64_ELx_FIQ   (2 << 9)
 454 #define KVM_ARM64_EXCEPT_AA64_ELx_SERR  (3 << 9)
 455 #define KVM_ARM64_EXCEPT_AA64_EL1       (0 << 11)
 456 #define KVM_ARM64_EXCEPT_AA64_EL2       (1 << 11)
 457
 458 #define KVM_ARM64_DEBUG_STATE_SAVE_SPE  (1 << 12) /* Save SPE context if active  */
 459 #define KVM_ARM64_DEBUG_STATE_SAVE_TRBE (1 << 13) /* Save TRBE context if active  */
 460 #define KVM_ARM64_FP_FOREIGN_FPSTATE    (1 << 14)
 461 #define KVM_ARM64_ON_UNSUPPORTED_CPU    (1 << 15) /* Physical CPU not in supported_cpus */
 462 #define KVM_ARM64_HOST_SME_ENABLED      (1 << 16) /* SME enabled for EL0 */
 463 #define KVM_ARM64_WFIT                  (1 << 17) /* WFIT instruction trapped */
 464
 465 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
 466                                  KVM_GUESTDBG_USE_SW_BP | \
 467                                  KVM_GUESTDBG_USE_HW | \
 468                                  KVM_GUESTDBG_SINGLESTEP)
 469
 470 #define vcpu_has_sve(vcpu) (system_supports_sve() &&                    \
 471                             ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE))
 472
 473 #ifdef CONFIG_ARM64_PTR_AUTH
 474 #define vcpu_has_ptrauth(vcpu)                                          \
 475         ((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) ||                \
 476           cpus_have_final_cap(ARM64_HAS_GENERIC_AUTH)) &&               \
 477          (vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH)
 478 #else
 479 #define vcpu_has_ptrauth(vcpu)          false
 480 #endif
 481
 482 #define vcpu_on_unsupported_cpu(vcpu)                                   \
 483         ((vcpu)->arch.flags & KVM_ARM64_ON_UNSUPPORTED_CPU)
 484
 485 #define vcpu_set_on_unsupported_cpu(vcpu)                               \
 486         ((vcpu)->arch.flags |= KVM_ARM64_ON_UNSUPPORTED_CPU)
 487
 488 #define vcpu_clear_on_unsupported_cpu(vcpu)                             \
 489         ((vcpu)->arch.flags &= ~KVM_ARM64_ON_UNSUPPORTED_CPU)
 490
 491 #define vcpu_gp_regs(v)         (&(v)->arch.ctxt.regs)
 492
 493 /*
 494  * Only use __vcpu_sys_reg/ctxt_sys_reg if you know you want the
 495  * memory backed version of a register, and not the one most recently
 496  * accessed by a running VCPU.  For example, for userspace access or
 497  * for system registers that are never context switched, but only
 498  * emulated.
 499  */
 500 #define __ctxt_sys_reg(c,r)     (&(c)->sys_regs[(r)])
 501
 502 #define ctxt_sys_reg(c,r)       (*__ctxt_sys_reg(c,r))
 503
 504 #define __vcpu_sys_reg(v,r)     (ctxt_sys_reg(&(v)->arch.ctxt, (r)))
 505
 506 u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg);
 507 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg);
 508
 509 static inline bool __vcpu_read_sys_reg_from_cpu(int reg, u64 *val)
 510 {
 511         /*
 512          * *** VHE ONLY ***
 513          *
 514          * System registers listed in the switch are not saved on every
 515          * exit from the guest but are only saved on vcpu_put.
 516          *
 517          * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but
 518          * should never be listed below, because the guest cannot modify its
 519          * own MPIDR_EL1 and MPIDR_EL1 is accessed for VCPU A from VCPU B's
 520          * thread when emulating cross-VCPU communication.
 521          */
 522         if (!has_vhe())
 523                 return false;
 524
 525         switch (reg) {
 526         case CSSELR_EL1:        *val = read_sysreg_s(SYS_CSSELR_EL1);   break;
 527         case SCTLR_EL1:         *val = read_sysreg_s(SYS_SCTLR_EL12);   break;
 528         case CPACR_EL1:         *val = read_sysreg_s(SYS_CPACR_EL12);   break;
 529         case TTBR0_EL1:         *val = read_sysreg_s(SYS_TTBR0_EL12);   break;
 530         case TTBR1_EL1:         *val = read_sysreg_s(SYS_TTBR1_EL12);   break;
 531         case TCR_EL1:           *val = read_sysreg_s(SYS_TCR_EL12);     break;
 532         case ESR_EL1:           *val = read_sysreg_s(SYS_ESR_EL12);     break;
 533         case AFSR0_EL1:         *val = read_sysreg_s(SYS_AFSR0_EL12);   break;
 534         case AFSR1_EL1:         *val = read_sysreg_s(SYS_AFSR1_EL12);   break;
 535         case FAR_EL1:           *val = read_sysreg_s(SYS_FAR_EL12);     break;
 536         case MAIR_EL1:          *val = read_sysreg_s(SYS_MAIR_EL12);    break;
 537         case VBAR_EL1:          *val = read_sysreg_s(SYS_VBAR_EL12);    break;
 538         case CONTEXTIDR_EL1:    *val = read_sysreg_s(SYS_CONTEXTIDR_EL12);break;
 539         case TPIDR_EL0:         *val = read_sysreg_s(SYS_TPIDR_EL0);    break;
 540         case TPIDRRO_EL0:       *val = read_sysreg_s(SYS_TPIDRRO_EL0);  break;
 541         case TPIDR_EL1:         *val = read_sysreg_s(SYS_TPIDR_EL1);    break;
 542         case AMAIR_EL1:         *val = read_sysreg_s(SYS_AMAIR_EL12);   break;
 543         case CNTKCTL_EL1:       *val = read_sysreg_s(SYS_CNTKCTL_EL12); break;
 544         case ELR_EL1:           *val = read_sysreg_s(SYS_ELR_EL12);     break;
 545         case PAR_EL1:           *val = read_sysreg_par();               break;
 546         case DACR32_EL2:        *val = read_sysreg_s(SYS_DACR32_EL2);   break;
 547         case IFSR32_EL2:        *val = read_sysreg_s(SYS_IFSR32_EL2);   break;
 548         case DBGVCR32_EL2:      *val = read_sysreg_s(SYS_DBGVCR32_EL2); break;
 549         default:                return false;
 550         }
 551
 552         return true;
 553 }
 554
 555 static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
 556 {
 557         /*
 558          * *** VHE ONLY ***
 559          *
 560          * System registers listed in the switch are not restored on every
 561          * entry to the guest but are only restored on vcpu_load.
 562          *
 563          * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but
 564          * should never be listed below, because the MPIDR should only be set
 565          * once, before running the VCPU, and never changed later.
 566          */
 567         if (!has_vhe())
 568                 return false;
 569
 570         switch (reg) {
 571         case CSSELR_EL1:        write_sysreg_s(val, SYS_CSSELR_EL1);    break;
 572         case SCTLR_EL1:         write_sysreg_s(val, SYS_SCTLR_EL12);    break;
 573         case CPACR_EL1:         write_sysreg_s(val, SYS_CPACR_EL12);    break;
 574         case TTBR0_EL1:         write_sysreg_s(val, SYS_TTBR0_EL12);    break;
 575         case TTBR1_EL1:         write_sysreg_s(val, SYS_TTBR1_EL12);    break;
 576         case TCR_EL1:           write_sysreg_s(val, SYS_TCR_EL12);      break;
 577         case ESR_EL1:           write_sysreg_s(val, SYS_ESR_EL12);      break;
 578         case AFSR0_EL1:         write_sysreg_s(val, SYS_AFSR0_EL12);    break;
 579         case AFSR1_EL1:         write_sysreg_s(val, SYS_AFSR1_EL12);    break;
 580         case FAR_EL1:           write_sysreg_s(val, SYS_FAR_EL12);      break;
 581         case MAIR_EL1:          write_sysreg_s(val, SYS_MAIR_EL12);     break;
 582         case VBAR_EL1:          write_sysreg_s(val, SYS_VBAR_EL12);     break;
 583         case CONTEXTIDR_EL1:    write_sysreg_s(val, SYS_CONTEXTIDR_EL12);break;
 584         case TPIDR_EL0:         write_sysreg_s(val, SYS_TPIDR_EL0);     break;
 585         case TPIDRRO_EL0:       write_sysreg_s(val, SYS_TPIDRRO_EL0);   break;
 586         case TPIDR_EL1:         write_sysreg_s(val, SYS_TPIDR_EL1);     break;
 587         case AMAIR_EL1:         write_sysreg_s(val, SYS_AMAIR_EL12);    break;
 588         case CNTKCTL_EL1:       write_sysreg_s(val, SYS_CNTKCTL_EL12);  break;
 589         case ELR_EL1:           write_sysreg_s(val, SYS_ELR_EL12);      break;
 590         case PAR_EL1:           write_sysreg_s(val, SYS_PAR_EL1);       break;
 591         case DACR32_EL2:        write_sysreg_s(val, SYS_DACR32_EL2);    break;
 592         case IFSR32_EL2:        write_sysreg_s(val, SYS_IFSR32_EL2);    break;
 593         case DBGVCR32_EL2:      write_sysreg_s(val, SYS_DBGVCR32_EL2);  break;
 594         default:                return false;
 595         }
 596
 597         return true;
 598 }
 599
 600 struct kvm_vm_stat {
 601         struct kvm_vm_stat_generic generic;
 602 };
 603
 604 struct kvm_vcpu_stat {
 605         struct kvm_vcpu_stat_generic generic;
 606         u64 hvc_exit_stat;
 607         u64 wfe_exit_stat;
 608         u64 wfi_exit_stat;
 609         u64 mmio_exit_user;
 610         u64 mmio_exit_kernel;
 611         u64 signal_exits;
 612         u64 exits;
 613 };
 614
 615 void kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 616 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 617 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 618 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 619 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 620
 621 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu);
 622 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 623 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 624 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 625
 626 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 627                               struct kvm_vcpu_events *events);
 628
 629 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 630                               struct kvm_vcpu_events *events);
 631
 632 #define KVM_ARCH_WANT_MMU_NOTIFIER
 633
 634 void kvm_arm_halt_guest(struct kvm *kvm);
 635 void kvm_arm_resume_guest(struct kvm *kvm);
 636
 637 #define vcpu_has_run_once(vcpu) !!rcu_access_pointer((vcpu)->pid)
 638
 639 #ifndef __KVM_NVHE_HYPERVISOR__
 640 #define kvm_call_hyp_nvhe(f, ...)                                               \
 641         ({                                                              \
 642                 struct arm_smccc_res res;                               \
 643                                                                         \
 644                 arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(f),               \
 645                                   ##__VA_ARGS__, &res);                 \
 646                 WARN_ON(res.a0 != SMCCC_RET_SUCCESS);                   \
 647                                                                         \
 648                 res.a1;                                                 \
 649         })
 650
 651 /*
 652  * The couple of isb() below are there to guarantee the same behaviour
 653  * on VHE as on !VHE, where the eret to EL1 acts as a context
 654  * synchronization event.
 655  */
 656 #define kvm_call_hyp(f, ...)                                            \
 657         do {                                                            \
 658                 if (has_vhe()) {                                        \
 659                         f(__VA_ARGS__);                                 \
 660                         isb();                                          \
 661                 } else {                                                \
 662                         kvm_call_hyp_nvhe(f, ##__VA_ARGS__);            \
 663                 }                                                       \
 664         } while(0)
 665
 666 #define kvm_call_hyp_ret(f, ...)                                        \
 667         ({                                                              \
 668                 typeof(f(__VA_ARGS__)) ret;                             \
 669                                                                         \
 670                 if (has_vhe()) {                                        \
 671                         ret = f(__VA_ARGS__);                           \
 672                         isb();                                          \
 673                 } else {                                                \
 674                         ret = kvm_call_hyp_nvhe(f, ##__VA_ARGS__);      \
 675                 }                                                       \
 676                                                                         \
 677                 ret;                                                    \
 678         })
 679 #else /* __KVM_NVHE_HYPERVISOR__ */
 680 #define kvm_call_hyp(f, ...) f(__VA_ARGS__)
 681 #define kvm_call_hyp_ret(f, ...) f(__VA_ARGS__)
 682 #define kvm_call_hyp_nvhe(f, ...) f(__VA_ARGS__)
 683 #endif /* __KVM_NVHE_HYPERVISOR__ */
 684
 685 void force_vm_exit(const cpumask_t *mask);
 686
 687 int handle_exit(struct kvm_vcpu *vcpu, int exception_index);
 688 void handle_exit_early(struct kvm_vcpu *vcpu, int exception_index);
 689
 690 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu);
 691 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu);
 692 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu);
 693 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu);
 694 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu);
 695 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu);
 696 int kvm_handle_cp10_id(struct kvm_vcpu *vcpu);
 697
 698 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu);
 699
 700 int kvm_sys_reg_table_init(void);
 701
 702 /* MMIO helpers */
 703 void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
 704 unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
 705
 706 int kvm_handle_mmio_return(struct kvm_vcpu *vcpu);
 707 int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa);
 708
 709 /*
 710  * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event,
 711  * arrived in guest context.  For arm64, any event that arrives while a vCPU is
 712  * loaded is considered to be "in guest".
 713  */
 714 static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
 715 {
 716         return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
 717 }
 718
 719 long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu);
 720 gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu);
 721 void kvm_update_stolen_time(struct kvm_vcpu *vcpu);
 722
 723 bool kvm_arm_pvtime_supported(void);
 724 int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
 725                             struct kvm_device_attr *attr);
 726 int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
 727                             struct kvm_device_attr *attr);
 728 int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
 729                             struct kvm_device_attr *attr);
 730
 731 extern unsigned int kvm_arm_vmid_bits;
 732 int kvm_arm_vmid_alloc_init(void);
 733 void kvm_arm_vmid_alloc_free(void);
 734 void kvm_arm_vmid_update(struct kvm_vmid *kvm_vmid);
 735 void kvm_arm_vmid_clear_active(void);
 736
 737 static inline void kvm_arm_pvtime_vcpu_init(struct kvm_vcpu_arch *vcpu_arch)
 738 {
 739         vcpu_arch->steal.base = GPA_INVALID;
 740 }
 741
 742 static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
 743 {
 744         return (vcpu_arch->steal.base != GPA_INVALID);
 745 }
 746
 747 void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome);
 748
 749 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 750
 751 DECLARE_KVM_HYP_PER_CPU(struct kvm_host_data, kvm_host_data);
 752
 753 static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt)
 754 {
 755         /* The host's MPIDR is immutable, so let's set it up at boot time */
 756         ctxt_sys_reg(cpu_ctxt, MPIDR_EL1) = read_cpuid_mpidr();
 757 }
 758
 759 static inline bool kvm_system_needs_idmapped_vectors(void)
 760 {
 761         return cpus_have_const_cap(ARM64_SPECTRE_V3A);
 762 }
 763
 764 void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu);
 765
 766 static inline void kvm_arch_hardware_unsetup(void) {}
 767 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 768 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 769
 770 void kvm_arm_init_debug(void);
 771 void kvm_arm_vcpu_init_debug(struct kvm_vcpu *vcpu);
 772 void kvm_arm_setup_debug(struct kvm_vcpu *vcpu);
 773 void kvm_arm_clear_debug(struct kvm_vcpu *vcpu);
 774 void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu);
 775
 776 #define kvm_vcpu_os_lock_enabled(vcpu)          \
 777         (!!(__vcpu_sys_reg(vcpu, OSLSR_EL1) & SYS_OSLSR_OSLK))
 778
 779 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 780                                struct kvm_device_attr *attr);
 781 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 782                                struct kvm_device_attr *attr);
 783 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 784                                struct kvm_device_attr *attr);
 785
 786 long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
 787                                 struct kvm_arm_copy_mte_tags *copy_tags);
 788
 789 /* Guest/host FPSIMD coordination helpers */
 790 int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu);
 791 void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu);
 792 void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu);
 793 void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu);
 794 void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu);
 795 void kvm_vcpu_unshare_task_fp(struct kvm_vcpu *vcpu);
 796
 797 static inline bool kvm_pmu_counter_deferred(struct perf_event_attr *attr)
 798 {
 799         return (!has_vhe() && attr->exclude_host);
 800 }
 801
 802 /* Flags for host debug state */
 803 void kvm_arch_vcpu_load_debug_state_flags(struct kvm_vcpu *vcpu);
 804 void kvm_arch_vcpu_put_debug_state_flags(struct kvm_vcpu *vcpu);
 805
 806 #ifdef CONFIG_KVM
 807 void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr);
 808 void kvm_clr_pmu_events(u32 clr);
 809 #else
 810 static inline void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr) {}
 811 static inline void kvm_clr_pmu_events(u32 clr) {}
 812 #endif
 813
 814 void kvm_vcpu_load_sysregs_vhe(struct kvm_vcpu *vcpu);
 815 void kvm_vcpu_put_sysregs_vhe(struct kvm_vcpu *vcpu);
 816
 817 int kvm_set_ipa_limit(void);
 818
 819 #define __KVM_HAVE_ARCH_VM_ALLOC
 820 struct kvm *kvm_arch_alloc_vm(void);
 821
 822 int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type);
 823
 824 static inline bool kvm_vm_is_protected(struct kvm *kvm)
 825 {
 826         return false;
 827 }
 828
 829 void kvm_init_protected_traps(struct kvm_vcpu *vcpu);
 830
 831 int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature);
 832 bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
 833
 834 #define kvm_arm_vcpu_sve_finalized(vcpu) \
 835         ((vcpu)->arch.flags & KVM_ARM64_VCPU_SVE_FINALIZED)
 836
 837 #define kvm_has_mte(kvm)                                        \
 838         (system_supports_mte() &&                               \
 839          test_bit(KVM_ARCH_FLAG_MTE_ENABLED, &(kvm)->arch.flags))
 840
 841 int kvm_trng_call(struct kvm_vcpu *vcpu);
 842 #ifdef CONFIG_KVM
 843 extern phys_addr_t hyp_mem_base;
 844 extern phys_addr_t hyp_mem_size;
 845 void __init kvm_hyp_reserve(void);
 846 #else
 847 static inline void kvm_hyp_reserve(void) { }
 848 #endif
 849
 850 void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu);
 851 bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
 852
 853 #endif /* __ARM64_KVM_HOST_H__ */