arch/arm/include/asm/kvm_host.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   4  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   5  */
   6
   7 #ifndef __ARM_KVM_HOST_H__
   8 #define __ARM_KVM_HOST_H__
   9
  10 #include <linux/arm-smccc.h>
  11 #include <linux/errno.h>
  12 #include <linux/types.h>
  13 #include <linux/kvm_types.h>
  14 #include <asm/cputype.h>
  15 #include <asm/kvm.h>
  16 #include <asm/kvm_asm.h>
  17 #include <asm/fpstate.h>
  18 #include <kvm/arm_arch_timer.h>
  19
  20 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  21
  22 #define KVM_USER_MEM_SLOTS 32
  23 #define KVM_HAVE_ONE_REG
  24 #define KVM_HALT_POLL_NS_DEFAULT 500000
  25
  26 #define KVM_VCPU_MAX_FEATURES 2
  27
  28 #include <kvm/arm_vgic.h>
  29
  30
  31 #ifdef CONFIG_ARM_GIC_V3
  32 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  33 #else
  34 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  35 #endif
  36
  37 #define KVM_REQ_SLEEP \
  38         KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  39 #define KVM_REQ_IRQ_PENDING     KVM_ARCH_REQ(1)
  40 #define KVM_REQ_VCPU_RESET      KVM_ARCH_REQ(2)
  41 #define KVM_REQ_RECORD_STEAL    KVM_ARCH_REQ(3)
  42
  43 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
  44
  45 static inline int kvm_arm_init_sve(void) { return 0; }
  46
  47 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  48 int __attribute_const__ kvm_target_cpu(void);
  49 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  50 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  51
  52 struct kvm_vmid {
  53         /* The VMID generation used for the virt. memory system */
  54         u64    vmid_gen;
  55         u32    vmid;
  56 };
  57
  58 struct kvm_arch {
  59         /* The last vcpu id that ran on each physical CPU */
  60         int __percpu *last_vcpu_ran;
  61
  62         /*
  63          * Anything that is not used directly from assembly code goes
  64          * here.
  65          */
  66
  67         /* The VMID generation used for the virt. memory system */
  68         struct kvm_vmid vmid;
  69
  70         /* Stage-2 page table */
  71         pgd_t *pgd;
  72         phys_addr_t pgd_phys;
  73
  74         /* Interrupt controller */
  75         struct vgic_dist        vgic;
  76         int max_vcpus;
  77
  78         /* Mandated version of PSCI */
  79         u32 psci_version;
  80
  81         /*
  82          * If we encounter a data abort without valid instruction syndrome
  83          * information, report this to user space.  User space can (and
  84          * should) opt in to this feature if KVM_CAP_ARM_NISV_TO_USER is
  85          * supported.
  86          */
  87         bool return_nisv_io_abort_to_user;
  88 };
  89
  90 #define KVM_NR_MEM_OBJS     40
  91
  92 /*
  93  * We don't want allocation failures within the mmu code, so we preallocate
  94  * enough memory for a single page fault in a cache.
  95  */
  96 struct kvm_mmu_memory_cache {
  97         int nobjs;
  98         void *objects[KVM_NR_MEM_OBJS];
  99 };
 100
 101 struct kvm_vcpu_fault_info {
 102         u32 hsr;                /* Hyp Syndrome Register */
 103         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
 104         u32 hpfar;              /* Hyp IPA Fault Address Register */
 105 };
 106
 107 /*
 108  * 0 is reserved as an invalid value.
 109  * Order should be kept in sync with the save/restore code.
 110  */
 111 enum vcpu_sysreg {
 112         __INVALID_SYSREG__,
 113         c0_MPIDR,               /* MultiProcessor ID Register */
 114         c0_CSSELR,              /* Cache Size Selection Register */
 115         c1_SCTLR,               /* System Control Register */
 116         c1_ACTLR,               /* Auxiliary Control Register */
 117         c1_CPACR,               /* Coprocessor Access Control */
 118         c2_TTBR0,               /* Translation Table Base Register 0 */
 119         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 120         c2_TTBR1,               /* Translation Table Base Register 1 */
 121         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 122         c2_TTBCR,               /* Translation Table Base Control R. */
 123         c3_DACR,                /* Domain Access Control Register */
 124         c5_DFSR,                /* Data Fault Status Register */
 125         c5_IFSR,                /* Instruction Fault Status Register */
 126         c5_ADFSR,               /* Auxilary Data Fault Status R */
 127         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 128         c6_DFAR,                /* Data Fault Address Register */
 129         c6_IFAR,                /* Instruction Fault Address Register */
 130         c7_PAR,                 /* Physical Address Register */
 131         c7_PAR_high,            /* PAR top 32 bits */
 132         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 133         c10_PRRR,               /* Primary Region Remap Register */
 134         c10_NMRR,               /* Normal Memory Remap Register */
 135         c12_VBAR,               /* Vector Base Address Register */
 136         c13_CID,                /* Context ID Register */
 137         c13_TID_URW,            /* Thread ID, User R/W */
 138         c13_TID_URO,            /* Thread ID, User R/O */
 139         c13_TID_PRIV,           /* Thread ID, Privileged */
 140         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 141         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 142         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 143         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 144 };
 145
 146 struct kvm_cpu_context {
 147         struct kvm_regs gp_regs;
 148         struct vfp_hard_struct vfp;
 149         u32 cp15[NR_CP15_REGS];
 150 };
 151
 152 struct kvm_host_data {
 153         struct kvm_cpu_context host_ctxt;
 154 };
 155
 156 typedef struct kvm_host_data kvm_host_data_t;
 157
 158 static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt)
 159 {
 160         /* The host's MPIDR is immutable, so let's set it up at boot time */
 161         cpu_ctxt->cp15[c0_MPIDR] = read_cpuid_mpidr();
 162 }
 163
 164 struct vcpu_reset_state {
 165         unsigned long   pc;
 166         unsigned long   r0;
 167         bool            be;
 168         bool            reset;
 169 };
 170
 171 struct kvm_vcpu_arch {
 172         struct kvm_cpu_context ctxt;
 173
 174         int target; /* Processor target */
 175         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 176
 177         /* The CPU type we expose to the VM */
 178         u32 midr;
 179
 180         /* HYP trapping configuration */
 181         u32 hcr;
 182
 183         /* Exception Information */
 184         struct kvm_vcpu_fault_info fault;
 185
 186         /* Host FP context */
 187         struct kvm_cpu_context *host_cpu_context;
 188
 189         /* VGIC state */
 190         struct vgic_cpu vgic_cpu;
 191         struct arch_timer_cpu timer_cpu;
 192
 193         /*
 194          * Anything that is not used directly from assembly code goes
 195          * here.
 196          */
 197
 198         /* vcpu power-off state */
 199         bool power_off;
 200
 201          /* Don't run the guest (internal implementation need) */
 202         bool pause;
 203
 204         /* Cache some mmu pages needed inside spinlock regions */
 205         struct kvm_mmu_memory_cache mmu_page_cache;
 206
 207         struct vcpu_reset_state reset_state;
 208
 209         /* Detect first run of a vcpu */
 210         bool has_run_once;
 211 };
 212
 213 struct kvm_vm_stat {
 214         ulong remote_tlb_flush;
 215 };
 216
 217 struct kvm_vcpu_stat {
 218         u64 halt_successful_poll;
 219         u64 halt_attempted_poll;
 220         u64 halt_poll_invalid;
 221         u64 halt_wakeup;
 222         u64 hvc_exit_stat;
 223         u64 wfe_exit_stat;
 224         u64 wfi_exit_stat;
 225         u64 mmio_exit_user;
 226         u64 mmio_exit_kernel;
 227         u64 exits;
 228 };
 229
 230 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 231
 232 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 233 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 234 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 235 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 236 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 237
 238 unsigned long __kvm_call_hyp(void *hypfn, ...);
 239
 240 /*
 241  * The has_vhe() part doesn't get emitted, but is used for type-checking.
 242  */
 243 #define kvm_call_hyp(f, ...)                                            \
 244         do {                                                            \
 245                 if (has_vhe()) {                                        \
 246                         f(__VA_ARGS__);                                 \
 247                 } else {                                                \
 248                         __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
 249                 }                                                       \
 250         } while(0)
 251
 252 #define kvm_call_hyp_ret(f, ...)                                        \
 253         ({                                                              \
 254                 typeof(f(__VA_ARGS__)) ret;                             \
 255                                                                         \
 256                 if (has_vhe()) {                                        \
 257                         ret = f(__VA_ARGS__);                           \
 258                 } else {                                                \
 259                         ret = __kvm_call_hyp(kvm_ksym_ref(f),           \
 260                                              ##__VA_ARGS__);            \
 261                 }                                                       \
 262                                                                         \
 263                 ret;                                                    \
 264         })
 265
 266 void force_vm_exit(const cpumask_t *mask);
 267 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 268                               struct kvm_vcpu_events *events);
 269
 270 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 271                               struct kvm_vcpu_events *events);
 272
 273 #define KVM_ARCH_WANT_MMU_NOTIFIER
 274 int kvm_unmap_hva_range(struct kvm *kvm,
 275                         unsigned long start, unsigned long end);
 276 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 277
 278 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 279 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 280 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 281 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 282
 283 void kvm_arm_halt_guest(struct kvm *kvm);
 284 void kvm_arm_resume_guest(struct kvm *kvm);
 285
 286 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 287 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 288 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 289 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 290
 291 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 292                 int exception_index);
 293
 294 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
 295                                      int exception_index) {}
 296
 297 /* MMIO helpers */
 298 void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
 299 unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
 300
 301 int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
 302 int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
 303                  phys_addr_t fault_ipa);
 304
 305 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 306                                        unsigned long hyp_stack_ptr,
 307                                        unsigned long vector_ptr)
 308 {
 309         /*
 310          * Call initialization code, and switch to the full blown HYP
 311          * code. The init code doesn't need to preserve these
 312          * registers as r0-r3 are already callee saved according to
 313          * the AAPCS.
 314          * Note that we slightly misuse the prototype by casting the
 315          * stack pointer to a void *.
 316
 317          * The PGDs are always passed as the third argument, in order
 318          * to be passed into r2-r3 to the init code (yes, this is
 319          * compliant with the PCS!).
 320          */
 321
 322         __kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 323 }
 324
 325 static inline void __cpu_init_stage2(void)
 326 {
 327         kvm_call_hyp(__init_stage2_translation);
 328 }
 329
 330 static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 331 {
 332         return 0;
 333 }
 334
 335 int kvm_perf_init(void);
 336 int kvm_perf_teardown(void);
 337
 338 static inline long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
 339 {
 340         return SMCCC_RET_NOT_SUPPORTED;
 341 }
 342
 343 static inline gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
 344 {
 345         return GPA_INVALID;
 346 }
 347
 348 static inline void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
 349 {
 350 }
 351
 352 static inline void kvm_arm_pvtime_vcpu_init(struct kvm_vcpu_arch *vcpu_arch)
 353 {
 354 }
 355
 356 static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
 357 {
 358         return false;
 359 }
 360
 361 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 362
 363 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 364
 365 static inline bool kvm_arch_requires_vhe(void) { return false; }
 366 static inline void kvm_arch_hardware_unsetup(void) {}
 367 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 368 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 369 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 370 static inline void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
 371
 372 static inline void kvm_arm_init_debug(void) {}
 373 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 374 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 375 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 376
 377 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 378                                struct kvm_device_attr *attr);
 379 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 380                                struct kvm_device_attr *attr);
 381 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 382                                struct kvm_device_attr *attr);
 383
 384 /*
 385  * VFP/NEON switching is all done by the hyp switch code, so no need to
 386  * coordinate with host context handling for this state:
 387  */
 388 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
 389 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
 390 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}
 391
 392 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
 393 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
 394
 395 static inline void kvm_arm_vhe_guest_enter(void) {}
 396 static inline void kvm_arm_vhe_guest_exit(void) {}
 397
 398 #define KVM_BP_HARDEN_UNKNOWN           -1
 399 #define KVM_BP_HARDEN_WA_NEEDED         0
 400 #define KVM_BP_HARDEN_NOT_REQUIRED      1
 401
 402 static inline int kvm_arm_harden_branch_predictor(void)
 403 {
 404         switch(read_cpuid_part()) {
 405 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 406         case ARM_CPU_PART_BRAHMA_B15:
 407         case ARM_CPU_PART_CORTEX_A12:
 408         case ARM_CPU_PART_CORTEX_A15:
 409         case ARM_CPU_PART_CORTEX_A17:
 410                 return KVM_BP_HARDEN_WA_NEEDED;
 411 #endif
 412         case ARM_CPU_PART_CORTEX_A7:
 413                 return KVM_BP_HARDEN_NOT_REQUIRED;
 414         default:
 415                 return KVM_BP_HARDEN_UNKNOWN;
 416         }
 417 }
 418
 419 #define KVM_SSBD_UNKNOWN                -1
 420 #define KVM_SSBD_FORCE_DISABLE          0
 421 #define KVM_SSBD_KERNEL         1
 422 #define KVM_SSBD_FORCE_ENABLE           2
 423 #define KVM_SSBD_MITIGATED              3
 424
 425 static inline int kvm_arm_have_ssbd(void)
 426 {
 427         /* No way to detect it yet, pretend it is not there. */
 428         return KVM_SSBD_UNKNOWN;
 429 }
 430
 431 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
 432 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
 433
 434 #define __KVM_HAVE_ARCH_VM_ALLOC
 435 struct kvm *kvm_arch_alloc_vm(void);
 436 void kvm_arch_free_vm(struct kvm *kvm);
 437
 438 static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 439 {
 440         /*
 441          * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
 442          * so any non-zero value used as type is illegal.
 443          */
 444         if (type)
 445                 return -EINVAL;
 446         return 0;
 447 }
 448
 449 static inline int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
 450 {
 451         return -EINVAL;
 452 }
 453
 454 static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 455 {
 456         return true;
 457 }
 458
 459 #endif /* __ARM_KVM_HOST_H__ */