arch/x86/kvm/vmx/vmx.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KVM_X86_VMX_H
   3 #define __KVM_X86_VMX_H
   4
   5 #include <linux/kvm_host.h>
   6
   7 #include <asm/kvm.h>
   8 #include <asm/intel_pt.h>
   9
  10 #include "capabilities.h"
  11 #include "kvm_cache_regs.h"
  12 #include "posted_intr.h"
  13 #include "vmcs.h"
  14 #include "vmx_ops.h"
  15 #include "cpuid.h"
  16
  17 #define MSR_TYPE_R      1
  18 #define MSR_TYPE_W      2
  19 #define MSR_TYPE_RW     3
  20
  21 #define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))
  22
  23 #ifdef CONFIG_X86_64
  24 #define MAX_NR_USER_RETURN_MSRS 7
  25 #else
  26 #define MAX_NR_USER_RETURN_MSRS 4
  27 #endif
  28
  29 #define MAX_NR_LOADSTORE_MSRS   8
  30
  31 struct vmx_msrs {
  32         unsigned int            nr;
  33         struct vmx_msr_entry    val[MAX_NR_LOADSTORE_MSRS];
  34 };
  35
  36 struct vmx_uret_msr {
  37         bool load_into_hardware;
  38         u64 data;
  39         u64 mask;
  40 };
  41
  42 enum segment_cache_field {
  43         SEG_FIELD_SEL = 0,
  44         SEG_FIELD_BASE = 1,
  45         SEG_FIELD_LIMIT = 2,
  46         SEG_FIELD_AR = 3,
  47
  48         SEG_FIELD_NR = 4
  49 };
  50
  51 #define RTIT_ADDR_RANGE         4
  52
  53 struct pt_ctx {
  54         u64 ctl;
  55         u64 status;
  56         u64 output_base;
  57         u64 output_mask;
  58         u64 cr3_match;
  59         u64 addr_a[RTIT_ADDR_RANGE];
  60         u64 addr_b[RTIT_ADDR_RANGE];
  61 };
  62
  63 struct pt_desc {
  64         u64 ctl_bitmask;
  65         u32 addr_range;
  66         u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
  67         struct pt_ctx host;
  68         struct pt_ctx guest;
  69 };
  70
  71 union vmx_exit_reason {
  72         struct {
  73                 u32     basic                   : 16;
  74                 u32     reserved16              : 1;
  75                 u32     reserved17              : 1;
  76                 u32     reserved18              : 1;
  77                 u32     reserved19              : 1;
  78                 u32     reserved20              : 1;
  79                 u32     reserved21              : 1;
  80                 u32     reserved22              : 1;
  81                 u32     reserved23              : 1;
  82                 u32     reserved24              : 1;
  83                 u32     reserved25              : 1;
  84                 u32     bus_lock_detected       : 1;
  85                 u32     enclave_mode            : 1;
  86                 u32     smi_pending_mtf         : 1;
  87                 u32     smi_from_vmx_root       : 1;
  88                 u32     reserved30              : 1;
  89                 u32     failed_vmentry          : 1;
  90         };
  91         u32 full;
  92 };
  93
  94 #define vcpu_to_lbr_desc(vcpu) (&to_vmx(vcpu)->lbr_desc)
  95 #define vcpu_to_lbr_records(vcpu) (&to_vmx(vcpu)->lbr_desc.records)
  96
  97 bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu);
  98 bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu);
  99
 100 int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu);
 101 void vmx_passthrough_lbr_msrs(struct kvm_vcpu *vcpu);
 102
 103 struct lbr_desc {
 104         /* Basic info about guest LBR records. */
 105         struct x86_pmu_lbr records;
 106
 107         /*
 108          * Emulate LBR feature via passthrough LBR registers when the
 109          * per-vcpu guest LBR event is scheduled on the current pcpu.
 110          *
 111          * The records may be inaccurate if the host reclaims the LBR.
 112          */
 113         struct perf_event *event;
 114
 115         /* True if LBRs are marked as not intercepted in the MSR bitmap */
 116         bool msr_passthrough;
 117 };
 118
 119 /*
 120  * The nested_vmx structure is part of vcpu_vmx, and holds information we need
 121  * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
 122  */
 123 struct nested_vmx {
 124         /* Has the level1 guest done vmxon? */
 125         bool vmxon;
 126         gpa_t vmxon_ptr;
 127         bool pml_full;
 128
 129         /* The guest-physical address of the current VMCS L1 keeps for L2 */
 130         gpa_t current_vmptr;
 131         /*
 132          * Cache of the guest's VMCS, existing outside of guest memory.
 133          * Loaded from guest memory during VMPTRLD. Flushed to guest
 134          * memory during VMCLEAR and VMPTRLD.
 135          */
 136         struct vmcs12 *cached_vmcs12;
 137         /*
 138          * Cache of the guest's shadow VMCS, existing outside of guest
 139          * memory. Loaded from guest memory during VM entry. Flushed
 140          * to guest memory during VM exit.
 141          */
 142         struct vmcs12 *cached_shadow_vmcs12;
 143
 144         /*
 145          * Indicates if the shadow vmcs or enlightened vmcs must be updated
 146          * with the data held by struct vmcs12.
 147          */
 148         bool need_vmcs12_to_shadow_sync;
 149         bool dirty_vmcs12;
 150
 151         /*
 152          * Indicates lazily loaded guest state has not yet been decached from
 153          * vmcs02.
 154          */
 155         bool need_sync_vmcs02_to_vmcs12_rare;
 156
 157         /*
 158          * vmcs02 has been initialized, i.e. state that is constant for
 159          * vmcs02 has been written to the backing VMCS.  Initialization
 160          * is delayed until L1 actually attempts to run a nested VM.
 161          */
 162         bool vmcs02_initialized;
 163
 164         bool change_vmcs01_virtual_apic_mode;
 165         bool reload_vmcs01_apic_access_page;
 166         bool update_vmcs01_cpu_dirty_logging;
 167
 168         /*
 169          * Enlightened VMCS has been enabled. It does not mean that L1 has to
 170          * use it. However, VMX features available to L1 will be limited based
 171          * on what the enlightened VMCS supports.
 172          */
 173         bool enlightened_vmcs_enabled;
 174
 175         /* L2 must run next, and mustn't decide to exit to L1. */
 176         bool nested_run_pending;
 177
 178         /* Pending MTF VM-exit into L1.  */
 179         bool mtf_pending;
 180
 181         struct loaded_vmcs vmcs02;
 182
 183         /*
 184          * Guest pages referred to in the vmcs02 with host-physical
 185          * pointers, so we must keep them pinned while L2 runs.
 186          */
 187         struct page *apic_access_page;
 188         struct kvm_host_map virtual_apic_map;
 189         struct kvm_host_map pi_desc_map;
 190
 191         struct kvm_host_map msr_bitmap_map;
 192
 193         struct pi_desc *pi_desc;
 194         bool pi_pending;
 195         u16 posted_intr_nv;
 196
 197         struct hrtimer preemption_timer;
 198         u64 preemption_timer_deadline;
 199         bool has_preemption_timer_deadline;
 200         bool preemption_timer_expired;
 201
 202         /* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
 203         u64 vmcs01_debugctl;
 204         u64 vmcs01_guest_bndcfgs;
 205
 206         /* to migrate it to L1 if L2 writes to L1's CR8 directly */
 207         int l1_tpr_threshold;
 208
 209         u16 vpid02;
 210         u16 last_vpid;
 211
 212         struct nested_vmx_msrs msrs;
 213
 214         /* SMM related state */
 215         struct {
 216                 /* in VMX operation on SMM entry? */
 217                 bool vmxon;
 218                 /* in guest mode on SMM entry? */
 219                 bool guest_mode;
 220         } smm;
 221
 222         gpa_t hv_evmcs_vmptr;
 223         struct kvm_host_map hv_evmcs_map;
 224         struct hv_enlightened_vmcs *hv_evmcs;
 225 };
 226
 227 struct vcpu_vmx {
 228         struct kvm_vcpu       vcpu;
 229         u8                    fail;
 230         u8                    x2apic_msr_bitmap_mode;
 231
 232         /*
 233          * If true, host state has been stored in vmx->loaded_vmcs for
 234          * the CPU registers that only need to be switched when transitioning
 235          * to/from the kernel, and the registers have been loaded with guest
 236          * values.  If false, host state is loaded in the CPU registers
 237          * and vmx->loaded_vmcs->host_state is invalid.
 238          */
 239         bool                  guest_state_loaded;
 240
 241         unsigned long         exit_qualification;
 242         u32                   exit_intr_info;
 243         u32                   idt_vectoring_info;
 244         ulong                 rflags;
 245
 246         /*
 247          * User return MSRs are always emulated when enabled in the guest, but
 248          * only loaded into hardware when necessary, e.g. SYSCALL #UDs outside
 249          * of 64-bit mode or if EFER.SCE=1, thus the SYSCALL MSRs don't need to
 250          * be loaded into hardware if those conditions aren't met.
 251          * nr_active_uret_msrs tracks the number of MSRs that need to be loaded
 252          * into hardware when running the guest.  guest_uret_msrs[] is resorted
 253          * whenever the number of "active" uret MSRs is modified.
 254          */
 255         struct vmx_uret_msr   guest_uret_msrs[MAX_NR_USER_RETURN_MSRS];
 256         int                   nr_active_uret_msrs;
 257         bool                  guest_uret_msrs_loaded;
 258 #ifdef CONFIG_X86_64
 259         u64                   msr_host_kernel_gs_base;
 260         u64                   msr_guest_kernel_gs_base;
 261 #endif
 262
 263         u64                   spec_ctrl;
 264         u32                   msr_ia32_umwait_control;
 265
 266         /*
 267          * loaded_vmcs points to the VMCS currently used in this vcpu. For a
 268          * non-nested (L1) guest, it always points to vmcs01. For a nested
 269          * guest (L2), it points to a different VMCS.
 270          */
 271         struct loaded_vmcs    vmcs01;
 272         struct loaded_vmcs   *loaded_vmcs;
 273
 274         struct msr_autoload {
 275                 struct vmx_msrs guest;
 276                 struct vmx_msrs host;
 277         } msr_autoload;
 278
 279         struct msr_autostore {
 280                 struct vmx_msrs guest;
 281         } msr_autostore;
 282
 283         struct {
 284                 int vm86_active;
 285                 ulong save_rflags;
 286                 struct kvm_segment segs[8];
 287         } rmode;
 288         struct {
 289                 u32 bitmask; /* 4 bits per segment (1 bit per field) */
 290                 struct kvm_save_segment {
 291                         u16 selector;
 292                         unsigned long base;
 293                         u32 limit;
 294                         u32 ar;
 295                 } seg[8];
 296         } segment_cache;
 297         int vpid;
 298         bool emulation_required;
 299
 300         union vmx_exit_reason exit_reason;
 301
 302         /* Posted interrupt descriptor */
 303         struct pi_desc pi_desc;
 304
 305         /* Support for a guest hypervisor (nested VMX) */
 306         struct nested_vmx nested;
 307
 308         /* Dynamic PLE window. */
 309         unsigned int ple_window;
 310         bool ple_window_dirty;
 311
 312         bool req_immediate_exit;
 313
 314         /* Support for PML */
 315 #define PML_ENTITY_NUM          512
 316         struct page *pml_pg;
 317
 318         /* apic deadline value in host tsc */
 319         u64 hv_deadline_tsc;
 320
 321         unsigned long host_debugctlmsr;
 322
 323         /*
 324          * Only bits masked by msr_ia32_feature_control_valid_bits can be set in
 325          * msr_ia32_feature_control. FEAT_CTL_LOCKED is always included
 326          * in msr_ia32_feature_control_valid_bits.
 327          */
 328         u64 msr_ia32_feature_control;
 329         u64 msr_ia32_feature_control_valid_bits;
 330         /* SGX Launch Control public key hash */
 331         u64 msr_ia32_sgxlepubkeyhash[4];
 332
 333         struct pt_desc pt_desc;
 334         struct lbr_desc lbr_desc;
 335
 336         /* Save desired MSR intercept (read: pass-through) state */
 337 #define MAX_POSSIBLE_PASSTHROUGH_MSRS   13
 338         struct {
 339                 DECLARE_BITMAP(read, MAX_POSSIBLE_PASSTHROUGH_MSRS);
 340                 DECLARE_BITMAP(write, MAX_POSSIBLE_PASSTHROUGH_MSRS);
 341         } shadow_msr_intercept;
 342 };
 343
 344 struct kvm_vmx {
 345         struct kvm kvm;
 346
 347         unsigned int tss_addr;
 348         bool ept_identity_pagetable_done;
 349         gpa_t ept_identity_map_addr;
 350 };
 351
 352 bool nested_vmx_allowed(struct kvm_vcpu *vcpu);
 353 void vmx_vcpu_load_vmcs(struct kvm_vcpu *vcpu, int cpu,
 354                         struct loaded_vmcs *buddy);
 355 int allocate_vpid(void);
 356 void free_vpid(int vpid);
 357 void vmx_set_constant_host_state(struct vcpu_vmx *vmx);
 358 void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu);
 359 void vmx_set_host_fs_gs(struct vmcs_host_state *host, u16 fs_sel, u16 gs_sel,
 360                         unsigned long fs_base, unsigned long gs_base);
 361 int vmx_get_cpl(struct kvm_vcpu *vcpu);
 362 unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu);
 363 void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 364 u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu);
 365 void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask);
 366 int vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer);
 367 void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 368 void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 369 void set_cr4_guest_host_mask(struct vcpu_vmx *vmx);
 370 void ept_save_pdptrs(struct kvm_vcpu *vcpu);
 371 void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 372 void __vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 373 u64 construct_eptp(struct kvm_vcpu *vcpu, hpa_t root_hpa, int root_level);
 374
 375 bool vmx_guest_inject_ac(struct kvm_vcpu *vcpu);
 376 void vmx_update_exception_bitmap(struct kvm_vcpu *vcpu);
 377 bool vmx_nmi_blocked(struct kvm_vcpu *vcpu);
 378 bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu);
 379 bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
 380 void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
 381 void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
 382 struct vmx_uret_msr *vmx_find_uret_msr(struct vcpu_vmx *vmx, u32 msr);
 383 void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu);
 384 void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp);
 385 bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched);
 386 int vmx_find_loadstore_msr_slot(struct vmx_msrs *m, u32 msr);
 387 void vmx_ept_load_pdptrs(struct kvm_vcpu *vcpu);
 388
 389 void vmx_disable_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr, int type);
 390 void vmx_enable_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr, int type);
 391
 392 u64 vmx_get_l2_tsc_offset(struct kvm_vcpu *vcpu);
 393 u64 vmx_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu);
 394
 395 static inline void vmx_set_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr,
 396                                              int type, bool value)
 397 {
 398         if (value)
 399                 vmx_enable_intercept_for_msr(vcpu, msr, type);
 400         else
 401                 vmx_disable_intercept_for_msr(vcpu, msr, type);
 402 }
 403
 404 void vmx_update_cpu_dirty_logging(struct kvm_vcpu *vcpu);
 405
 406 static inline u8 vmx_get_rvi(void)
 407 {
 408         return vmcs_read16(GUEST_INTR_STATUS) & 0xff;
 409 }
 410
 411 #define BUILD_CONTROLS_SHADOW(lname, uname)                                 \
 412 static inline void lname##_controls_set(struct vcpu_vmx *vmx, u32 val)      \
 413 {                                                                           \
 414         if (vmx->loaded_vmcs->controls_shadow.lname != val) {               \
 415                 vmcs_write32(uname, val);                                   \
 416                 vmx->loaded_vmcs->controls_shadow.lname = val;              \
 417         }                                                                   \
 418 }                                                                           \
 419 static inline u32 __##lname##_controls_get(struct loaded_vmcs *vmcs)        \
 420 {                                                                           \
 421         return vmcs->controls_shadow.lname;                                 \
 422 }                                                                           \
 423 static inline u32 lname##_controls_get(struct vcpu_vmx *vmx)                \
 424 {                                                                           \
 425         return __##lname##_controls_get(vmx->loaded_vmcs);                  \
 426 }                                                                           \
 427 static inline void lname##_controls_setbit(struct vcpu_vmx *vmx, u32 val)   \
 428 {                                                                           \
 429         lname##_controls_set(vmx, lname##_controls_get(vmx) | val);         \
 430 }                                                                           \
 431 static inline void lname##_controls_clearbit(struct vcpu_vmx *vmx, u32 val) \
 432 {                                                                           \
 433         lname##_controls_set(vmx, lname##_controls_get(vmx) & ~val);        \
 434 }
 435 BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS)
 436 BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS)
 437 BUILD_CONTROLS_SHADOW(pin, PIN_BASED_VM_EXEC_CONTROL)
 438 BUILD_CONTROLS_SHADOW(exec, CPU_BASED_VM_EXEC_CONTROL)
 439 BUILD_CONTROLS_SHADOW(secondary_exec, SECONDARY_VM_EXEC_CONTROL)
 440
 441 static inline void vmx_register_cache_reset(struct kvm_vcpu *vcpu)
 442 {
 443         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
 444                                   | (1 << VCPU_EXREG_RFLAGS)
 445                                   | (1 << VCPU_EXREG_PDPTR)
 446                                   | (1 << VCPU_EXREG_SEGMENTS)
 447                                   | (1 << VCPU_EXREG_CR0)
 448                                   | (1 << VCPU_EXREG_CR3)
 449                                   | (1 << VCPU_EXREG_CR4)
 450                                   | (1 << VCPU_EXREG_EXIT_INFO_1)
 451                                   | (1 << VCPU_EXREG_EXIT_INFO_2));
 452         vcpu->arch.regs_dirty = 0;
 453 }
 454
 455 static inline struct kvm_vmx *to_kvm_vmx(struct kvm *kvm)
 456 {
 457         return container_of(kvm, struct kvm_vmx, kvm);
 458 }
 459
 460 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
 461 {
 462         return container_of(vcpu, struct vcpu_vmx, vcpu);
 463 }
 464
 465 static inline unsigned long vmx_get_exit_qual(struct kvm_vcpu *vcpu)
 466 {
 467         struct vcpu_vmx *vmx = to_vmx(vcpu);
 468
 469         if (!kvm_register_is_available(vcpu, VCPU_EXREG_EXIT_INFO_1)) {
 470                 kvm_register_mark_available(vcpu, VCPU_EXREG_EXIT_INFO_1);
 471                 vmx->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 472         }
 473         return vmx->exit_qualification;
 474 }
 475
 476 static inline u32 vmx_get_intr_info(struct kvm_vcpu *vcpu)
 477 {
 478         struct vcpu_vmx *vmx = to_vmx(vcpu);
 479
 480         if (!kvm_register_is_available(vcpu, VCPU_EXREG_EXIT_INFO_2)) {
 481                 kvm_register_mark_available(vcpu, VCPU_EXREG_EXIT_INFO_2);
 482                 vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
 483         }
 484         return vmx->exit_intr_info;
 485 }
 486
 487 struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags);
 488 void free_vmcs(struct vmcs *vmcs);
 489 int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
 490 void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
 491 void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs);
 492
 493 static inline struct vmcs *alloc_vmcs(bool shadow)
 494 {
 495         return alloc_vmcs_cpu(shadow, raw_smp_processor_id(),
 496                               GFP_KERNEL_ACCOUNT);
 497 }
 498
 499 static inline bool vmx_has_waitpkg(struct vcpu_vmx *vmx)
 500 {
 501         return secondary_exec_controls_get(vmx) &
 502                 SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE;
 503 }
 504
 505 static inline bool vmx_need_pf_intercept(struct kvm_vcpu *vcpu)
 506 {
 507         if (!enable_ept)
 508                 return true;
 509
 510         return allow_smaller_maxphyaddr && cpuid_maxphyaddr(vcpu) < boot_cpu_data.x86_phys_bits;
 511 }
 512
 513 static inline bool is_unrestricted_guest(struct kvm_vcpu *vcpu)
 514 {
 515         return enable_unrestricted_guest && (!is_guest_mode(vcpu) ||
 516             (secondary_exec_controls_get(to_vmx(vcpu)) &
 517             SECONDARY_EXEC_UNRESTRICTED_GUEST));
 518 }
 519
 520 bool __vmx_guest_state_valid(struct kvm_vcpu *vcpu);
 521 static inline bool vmx_guest_state_valid(struct kvm_vcpu *vcpu)
 522 {
 523         return is_unrestricted_guest(vcpu) || __vmx_guest_state_valid(vcpu);
 524 }
 525
 526 void dump_vmcs(struct kvm_vcpu *vcpu);
 527
 528 #endif /* __KVM_X86_VMX_H */