arch/x86/include/asm/kvm_host.h

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This header defines architecture specific interfaces, x86 version
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #ifndef _ASM_X86_KVM_HOST_H
  12 #define _ASM_X86_KVM_HOST_H
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/mmu_notifier.h>
  17 #include <linux/tracepoint.h>
  18
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_para.h>
  21 #include <linux/kvm_types.h>
  22
  23 #include <asm/pvclock-abi.h>
  24 #include <asm/desc.h>
  25 #include <asm/mtrr.h>
  26 #include <asm/msr-index.h>
  27
  28 #define KVM_MAX_VCPUS 16
  29 #define KVM_MEMORY_SLOTS 32
  30 /* memory slots that does not exposed to userspace */
  31 #define KVM_PRIVATE_MEM_SLOTS 4
  32
  33 #define KVM_PIO_PAGE_OFFSET 1
  34 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  35
  36 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  37 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  38 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  39                                   0xFFFFFF0000000000ULL)
  40
  41 #define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST                           \
  42         (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
  43 #define KVM_GUEST_CR0_MASK                                              \
  44         (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
  45 #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST                         \
  46         (X86_CR0_WP | X86_CR0_NE | X86_CR0_TS | X86_CR0_MP)
  47 #define KVM_VM_CR0_ALWAYS_ON                                            \
  48         (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
  49 #define KVM_GUEST_CR4_MASK                                              \
  50         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  51 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  52 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  53
  54 #define INVALID_PAGE (~(hpa_t)0)
  55 #define UNMAPPED_GVA (~(gpa_t)0)
  56
  57 /* KVM Hugepage definitions for x86 */
  58 #define KVM_NR_PAGE_SIZES       2
  59 #define KVM_HPAGE_SHIFT(x)      (PAGE_SHIFT + (((x) - 1) * 9))
  60 #define KVM_HPAGE_SIZE(x)       (1UL << KVM_HPAGE_SHIFT(x))
  61 #define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
  62 #define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
  63
  64 #define DE_VECTOR 0
  65 #define DB_VECTOR 1
  66 #define BP_VECTOR 3
  67 #define OF_VECTOR 4
  68 #define BR_VECTOR 5
  69 #define UD_VECTOR 6
  70 #define NM_VECTOR 7
  71 #define DF_VECTOR 8
  72 #define TS_VECTOR 10
  73 #define NP_VECTOR 11
  74 #define SS_VECTOR 12
  75 #define GP_VECTOR 13
  76 #define PF_VECTOR 14
  77 #define MF_VECTOR 16
  78 #define MC_VECTOR 18
  79
  80 #define SELECTOR_TI_MASK (1 << 2)
  81 #define SELECTOR_RPL_MASK 0x03
  82
  83 #define IOPL_SHIFT 12
  84
  85 #define KVM_ALIAS_SLOTS 4
  86
  87 #define KVM_PERMILLE_MMU_PAGES 20
  88 #define KVM_MIN_ALLOC_MMU_PAGES 64
  89 #define KVM_MMU_HASH_SHIFT 10
  90 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  91 #define KVM_MIN_FREE_MMU_PAGES 5
  92 #define KVM_REFILL_PAGES 25
  93 #define KVM_MAX_CPUID_ENTRIES 40
  94 #define KVM_NR_FIXED_MTRR_REGION 88
  95 #define KVM_NR_VAR_MTRR 8
  96
  97 extern spinlock_t kvm_lock;
  98 extern struct list_head vm_list;
  99
 100 struct kvm_vcpu;
 101 struct kvm;
 102
 103 enum kvm_reg {
 104         VCPU_REGS_RAX = 0,
 105         VCPU_REGS_RCX = 1,
 106         VCPU_REGS_RDX = 2,
 107         VCPU_REGS_RBX = 3,
 108         VCPU_REGS_RSP = 4,
 109         VCPU_REGS_RBP = 5,
 110         VCPU_REGS_RSI = 6,
 111         VCPU_REGS_RDI = 7,
 112 #ifdef CONFIG_X86_64
 113         VCPU_REGS_R8 = 8,
 114         VCPU_REGS_R9 = 9,
 115         VCPU_REGS_R10 = 10,
 116         VCPU_REGS_R11 = 11,
 117         VCPU_REGS_R12 = 12,
 118         VCPU_REGS_R13 = 13,
 119         VCPU_REGS_R14 = 14,
 120         VCPU_REGS_R15 = 15,
 121 #endif
 122         VCPU_REGS_RIP,
 123         NR_VCPU_REGS
 124 };
 125
 126 enum kvm_reg_ex {
 127         VCPU_EXREG_PDPTR = NR_VCPU_REGS,
 128 };
 129
 130 enum {
 131         VCPU_SREG_ES,
 132         VCPU_SREG_CS,
 133         VCPU_SREG_SS,
 134         VCPU_SREG_DS,
 135         VCPU_SREG_FS,
 136         VCPU_SREG_GS,
 137         VCPU_SREG_TR,
 138         VCPU_SREG_LDTR,
 139 };
 140
 141 #include <asm/kvm_x86_emulate.h>
 142
 143 #define KVM_NR_MEM_OBJS 40
 144
 145 #define KVM_NR_DB_REGS  4
 146
 147 #define DR6_BD          (1 << 13)
 148 #define DR6_BS          (1 << 14)
 149 #define DR6_FIXED_1     0xffff0ff0
 150 #define DR6_VOLATILE    0x0000e00f
 151
 152 #define DR7_BP_EN_MASK  0x000000ff
 153 #define DR7_GE          (1 << 9)
 154 #define DR7_GD          (1 << 13)
 155 #define DR7_FIXED_1     0x00000400
 156 #define DR7_VOLATILE    0xffff23ff
 157
 158 /*
 159  * We don't want allocation failures within the mmu code, so we preallocate
 160  * enough memory for a single page fault in a cache.
 161  */
 162 struct kvm_mmu_memory_cache {
 163         int nobjs;
 164         void *objects[KVM_NR_MEM_OBJS];
 165 };
 166
 167 #define NR_PTE_CHAIN_ENTRIES 5
 168
 169 struct kvm_pte_chain {
 170         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 171         struct hlist_node link;
 172 };
 173
 174 /*
 175  * kvm_mmu_page_role, below, is defined as:
 176  *
 177  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 178  *   bits 4:7 - page table level for this shadow (1-4)
 179  *   bits 8:9 - page table quadrant for 2-level guests
 180  *   bit   16 - direct mapping of virtual to physical mapping at gfn
 181  *              used for real mode and two-dimensional paging
 182  *   bits 17:19 - common access permissions for all ptes in this shadow page
 183  */
 184 union kvm_mmu_page_role {
 185         unsigned word;
 186         struct {
 187                 unsigned glevels:4;
 188                 unsigned level:4;
 189                 unsigned quadrant:2;
 190                 unsigned pad_for_nice_hex_output:6;
 191                 unsigned direct:1;
 192                 unsigned access:3;
 193                 unsigned invalid:1;
 194                 unsigned cr4_pge:1;
 195                 unsigned nxe:1;
 196         };
 197 };
 198
 199 struct kvm_mmu_page {
 200         struct list_head link;
 201         struct hlist_node hash_link;
 202
 203         struct list_head oos_link;
 204
 205         /*
 206          * The following two entries are used to key the shadow page in the
 207          * hash table.
 208          */
 209         gfn_t gfn;
 210         union kvm_mmu_page_role role;
 211
 212         u64 *spt;
 213         /* hold the gfn of each spte inside spt */
 214         gfn_t *gfns;
 215         /*
 216          * One bit set per slot which has memory
 217          * in this shadow page.
 218          */
 219         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 220         int multimapped;         /* More than one parent_pte? */
 221         int root_count;          /* Currently serving as active root */
 222         bool unsync;
 223         unsigned int unsync_children;
 224         union {
 225                 u64 *parent_pte;               /* !multimapped */
 226                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 227         };
 228         DECLARE_BITMAP(unsync_child_bitmap, 512);
 229 };
 230
 231 struct kvm_pv_mmu_op_buffer {
 232         void *ptr;
 233         unsigned len;
 234         unsigned processed;
 235         char buf[512] __aligned(sizeof(long));
 236 };
 237
 238 struct kvm_pio_request {
 239         unsigned long count;
 240         int cur_count;
 241         gva_t guest_gva;
 242         int in;
 243         int port;
 244         int size;
 245         int string;
 246         int down;
 247         int rep;
 248 };
 249
 250 /*
 251  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 252  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 253  * mode.
 254  */
 255 struct kvm_mmu {
 256         void (*new_cr3)(struct kvm_vcpu *vcpu);
 257         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 258         void (*free)(struct kvm_vcpu *vcpu);
 259         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 260         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 261                               struct kvm_mmu_page *page);
 262         int (*sync_page)(struct kvm_vcpu *vcpu,
 263                          struct kvm_mmu_page *sp);
 264         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 265         hpa_t root_hpa;
 266         int root_level;
 267         int shadow_root_level;
 268         union kvm_mmu_page_role base_role;
 269
 270         u64 *pae_root;
 271         u64 rsvd_bits_mask[2][4];
 272 };
 273
 274 struct kvm_vcpu_arch {
 275         u64 host_tsc;
 276         /*
 277          * rip and regs accesses must go through
 278          * kvm_{register,rip}_{read,write} functions.
 279          */
 280         unsigned long regs[NR_VCPU_REGS];
 281         u32 regs_avail;
 282         u32 regs_dirty;
 283
 284         unsigned long cr0;
 285         unsigned long cr2;
 286         unsigned long cr3;
 287         unsigned long cr4;
 288         unsigned long cr8;
 289         u32 hflags;
 290         u64 pdptrs[4]; /* pae */
 291         u64 shadow_efer;
 292         u64 apic_base;
 293         struct kvm_lapic *apic;    /* kernel irqchip context */
 294         int32_t apic_arb_prio;
 295         int mp_state;
 296         int sipi_vector;
 297         u64 ia32_misc_enable_msr;
 298         bool tpr_access_reporting;
 299
 300         struct kvm_mmu mmu;
 301         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 302          * put it here to avoid allocation */
 303         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 304
 305         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 306         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 307         struct kvm_mmu_memory_cache mmu_page_cache;
 308         struct kvm_mmu_memory_cache mmu_page_header_cache;
 309
 310         gfn_t last_pt_write_gfn;
 311         int   last_pt_write_count;
 312         u64  *last_pte_updated;
 313         gfn_t last_pte_gfn;
 314
 315         struct {
 316                 gfn_t gfn;      /* presumed gfn during guest pte update */
 317                 pfn_t pfn;      /* pfn corresponding to that gfn */
 318                 int largepage;
 319                 unsigned long mmu_seq;
 320         } update_pte;
 321
 322         struct i387_fxsave_struct host_fx_image;
 323         struct i387_fxsave_struct guest_fx_image;
 324
 325         gva_t mmio_fault_cr2;
 326         struct kvm_pio_request pio;
 327         void *pio_data;
 328
 329         u8 event_exit_inst_len;
 330
 331         struct kvm_queued_exception {
 332                 bool pending;
 333                 bool has_error_code;
 334                 u8 nr;
 335                 u32 error_code;
 336         } exception;
 337
 338         struct kvm_queued_interrupt {
 339                 bool pending;
 340                 bool soft;
 341                 u8 nr;
 342         } interrupt;
 343
 344         int halt_request; /* real mode on Intel only */
 345
 346         int cpuid_nent;
 347         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 348         /* emulate context */
 349
 350         struct x86_emulate_ctxt emulate_ctxt;
 351
 352         gpa_t time;
 353         struct pvclock_vcpu_time_info hv_clock;
 354         unsigned int hv_clock_tsc_khz;
 355         unsigned int time_offset;
 356         struct page *time_page;
 357
 358         bool singlestep; /* guest is single stepped by KVM */
 359         bool nmi_pending;
 360         bool nmi_injected;
 361
 362         struct mtrr_state_type mtrr_state;
 363         u32 pat;
 364
 365         int switch_db_regs;
 366         unsigned long host_db[KVM_NR_DB_REGS];
 367         unsigned long host_dr6;
 368         unsigned long host_dr7;
 369         unsigned long db[KVM_NR_DB_REGS];
 370         unsigned long dr6;
 371         unsigned long dr7;
 372         unsigned long eff_db[KVM_NR_DB_REGS];
 373
 374         u64 mcg_cap;
 375         u64 mcg_status;
 376         u64 mcg_ctl;
 377         u64 *mce_banks;
 378 };
 379
 380 struct kvm_mem_alias {
 381         gfn_t base_gfn;
 382         unsigned long npages;
 383         gfn_t target_gfn;
 384 };
 385
 386 struct kvm_arch{
 387         int naliases;
 388         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 389
 390         unsigned int n_free_mmu_pages;
 391         unsigned int n_requested_mmu_pages;
 392         unsigned int n_alloc_mmu_pages;
 393         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 394         /*
 395          * Hash table of struct kvm_mmu_page.
 396          */
 397         struct list_head active_mmu_pages;
 398         struct list_head assigned_dev_head;
 399         struct iommu_domain *iommu_domain;
 400         int iommu_flags;
 401         struct kvm_pic *vpic;
 402         struct kvm_ioapic *vioapic;
 403         struct kvm_pit *vpit;
 404         struct hlist_head irq_ack_notifier_list;
 405         int vapics_in_nmi_mode;
 406
 407         unsigned int tss_addr;
 408         struct page *apic_access_page;
 409
 410         gpa_t wall_clock;
 411
 412         struct page *ept_identity_pagetable;
 413         bool ept_identity_pagetable_done;
 414
 415         unsigned long irq_sources_bitmap;
 416         unsigned long irq_states[KVM_IOAPIC_NUM_PINS];
 417         u64 vm_init_tsc;
 418 };
 419
 420 struct kvm_vm_stat {
 421         u32 mmu_shadow_zapped;
 422         u32 mmu_pte_write;
 423         u32 mmu_pte_updated;
 424         u32 mmu_pde_zapped;
 425         u32 mmu_flooded;
 426         u32 mmu_recycled;
 427         u32 mmu_cache_miss;
 428         u32 mmu_unsync;
 429         u32 remote_tlb_flush;
 430         u32 lpages;
 431 };
 432
 433 struct kvm_vcpu_stat {
 434         u32 pf_fixed;
 435         u32 pf_guest;
 436         u32 tlb_flush;
 437         u32 invlpg;
 438
 439         u32 exits;
 440         u32 io_exits;
 441         u32 mmio_exits;
 442         u32 signal_exits;
 443         u32 irq_window_exits;
 444         u32 nmi_window_exits;
 445         u32 halt_exits;
 446         u32 halt_wakeup;
 447         u32 request_irq_exits;
 448         u32 irq_exits;
 449         u32 host_state_reload;
 450         u32 efer_reload;
 451         u32 fpu_reload;
 452         u32 insn_emulation;
 453         u32 insn_emulation_fail;
 454         u32 hypercalls;
 455         u32 irq_injections;
 456         u32 nmi_injections;
 457 };
 458
 459 struct descriptor_table {
 460         u16 limit;
 461         unsigned long base;
 462 } __attribute__((packed));
 463
 464 struct kvm_x86_ops {
 465         int (*cpu_has_kvm_support)(void);          /* __init */
 466         int (*disabled_by_bios)(void);             /* __init */
 467         void (*hardware_enable)(void *dummy);      /* __init */
 468         void (*hardware_disable)(void *dummy);
 469         void (*check_processor_compatibility)(void *rtn);
 470         int (*hardware_setup)(void);               /* __init */
 471         void (*hardware_unsetup)(void);            /* __exit */
 472         bool (*cpu_has_accelerated_tpr)(void);
 473
 474         /* Create, but do not attach this VCPU */
 475         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 476         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 477         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 478
 479         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 480         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 481         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 482
 483         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 484                                struct kvm_guest_debug *dbg);
 485         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 486         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 487         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 488         void (*get_segment)(struct kvm_vcpu *vcpu,
 489                             struct kvm_segment *var, int seg);
 490         int (*get_cpl)(struct kvm_vcpu *vcpu);
 491         void (*set_segment)(struct kvm_vcpu *vcpu,
 492                             struct kvm_segment *var, int seg);
 493         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 494         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 495         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 496         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 497         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 498         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 499         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 500         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 501         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 502         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 503         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 504         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 505                        int *exception);
 506         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 507         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 508         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 509
 510         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 511
 512         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 513         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 514         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 515         void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 516         u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 517         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 518                                 unsigned char *hypercall_addr);
 519         void (*set_irq)(struct kvm_vcpu *vcpu);
 520         void (*set_nmi)(struct kvm_vcpu *vcpu);
 521         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 522                                 bool has_error_code, u32 error_code);
 523         int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 524         int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 525         void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 526         void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 527         void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
 528         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 529         int (*get_tdp_level)(void);
 530         u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 531         const struct trace_print_flags *exit_reasons_str;
 532 };
 533
 534 extern struct kvm_x86_ops *kvm_x86_ops;
 535
 536 int kvm_mmu_module_init(void);
 537 void kvm_mmu_module_exit(void);
 538
 539 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 540 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 541 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 542 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 543 void kvm_mmu_set_base_ptes(u64 base_pte);
 544 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 545                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 546
 547 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 548 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 549 void kvm_mmu_zap_all(struct kvm *kvm);
 550 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 551 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 552
 553 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 554
 555 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 556                           const void *val, int bytes);
 557 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 558                   gpa_t addr, unsigned long *ret);
 559 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 560
 561 extern bool tdp_enabled;
 562
 563 enum emulation_result {
 564         EMULATE_DONE,       /* no further processing */
 565         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 566         EMULATE_FAIL,         /* can't emulate this instruction */
 567 };
 568
 569 #define EMULTYPE_NO_DECODE          (1 << 0)
 570 #define EMULTYPE_TRAP_UD            (1 << 1)
 571 #define EMULTYPE_SKIP               (1 << 2)
 572 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 573                         unsigned long cr2, u16 error_code, int emulation_type);
 574 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 575 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 576 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 577 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 578                    unsigned long *rflags);
 579
 580 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 581 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 582                      unsigned long *rflags);
 583 void kvm_enable_efer_bits(u64);
 584 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 585 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 586
 587 struct x86_emulate_ctxt;
 588
 589 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 590                      int size, unsigned port);
 591 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 592                            int size, unsigned long count, int down,
 593                             gva_t address, int rep, unsigned port);
 594 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 595 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 596 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 597 int emulate_clts(struct kvm_vcpu *vcpu);
 598 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 599                     unsigned long *dest);
 600 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 601                     unsigned long value);
 602
 603 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 604 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 605                                 int type_bits, int seg);
 606
 607 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 608
 609 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 610 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 611 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 612 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 613 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 614 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 615 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 616
 617 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 618 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 619
 620 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 621 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 622 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 623                            u32 error_code);
 624
 625 int kvm_pic_set_irq(void *opaque, int irq, int level);
 626
 627 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 628
 629 void fx_init(struct kvm_vcpu *vcpu);
 630
 631 int emulator_write_emulated(unsigned long addr,
 632                             const void *val,
 633                             unsigned int bytes,
 634                             struct kvm_vcpu *vcpu);
 635
 636 unsigned long segment_base(u16 selector);
 637
 638 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 639 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 640                        const u8 *new, int bytes,
 641                        bool guest_initiated);
 642 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 643 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 644 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 645 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 646 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 647
 648 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 649
 650 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 651
 652 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 653 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 654
 655 void kvm_enable_tdp(void);
 656 void kvm_disable_tdp(void);
 657
 658 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 659 int complete_pio(struct kvm_vcpu *vcpu);
 660
 661 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 662
 663 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 664 {
 665         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 666
 667         return (struct kvm_mmu_page *)page_private(page);
 668 }
 669
 670 static inline u16 kvm_read_fs(void)
 671 {
 672         u16 seg;
 673         asm("mov %%fs, %0" : "=g"(seg));
 674         return seg;
 675 }
 676
 677 static inline u16 kvm_read_gs(void)
 678 {
 679         u16 seg;
 680         asm("mov %%gs, %0" : "=g"(seg));
 681         return seg;
 682 }
 683
 684 static inline u16 kvm_read_ldt(void)
 685 {
 686         u16 ldt;
 687         asm("sldt %0" : "=g"(ldt));
 688         return ldt;
 689 }
 690
 691 static inline void kvm_load_fs(u16 sel)
 692 {
 693         asm("mov %0, %%fs" : : "rm"(sel));
 694 }
 695
 696 static inline void kvm_load_gs(u16 sel)
 697 {
 698         asm("mov %0, %%gs" : : "rm"(sel));
 699 }
 700
 701 static inline void kvm_load_ldt(u16 sel)
 702 {
 703         asm("lldt %0" : : "rm"(sel));
 704 }
 705
 706 static inline void kvm_get_idt(struct descriptor_table *table)
 707 {
 708         asm("sidt %0" : "=m"(*table));
 709 }
 710
 711 static inline void kvm_get_gdt(struct descriptor_table *table)
 712 {
 713         asm("sgdt %0" : "=m"(*table));
 714 }
 715
 716 static inline unsigned long kvm_read_tr_base(void)
 717 {
 718         u16 tr;
 719         asm("str %0" : "=g"(tr));
 720         return segment_base(tr);
 721 }
 722
 723 #ifdef CONFIG_X86_64
 724 static inline unsigned long read_msr(unsigned long msr)
 725 {
 726         u64 value;
 727
 728         rdmsrl(msr, value);
 729         return value;
 730 }
 731 #endif
 732
 733 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 734 {
 735         asm("fxsave (%0)":: "r" (image));
 736 }
 737
 738 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 739 {
 740         asm("fxrstor (%0)":: "r" (image));
 741 }
 742
 743 static inline void kvm_fx_finit(void)
 744 {
 745         asm("finit");
 746 }
 747
 748 static inline u32 get_rdx_init_val(void)
 749 {
 750         return 0x600; /* P6 family */
 751 }
 752
 753 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 754 {
 755         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 756 }
 757
 758 #define TSS_IOPB_BASE_OFFSET 0x66
 759 #define TSS_BASE_SIZE 0x68
 760 #define TSS_IOPB_SIZE (65536 / 8)
 761 #define TSS_REDIRECTION_SIZE (256 / 8)
 762 #define RMODE_TSS_SIZE                                                  \
 763         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 764
 765 enum {
 766         TASK_SWITCH_CALL = 0,
 767         TASK_SWITCH_IRET = 1,
 768         TASK_SWITCH_JMP = 2,
 769         TASK_SWITCH_GATE = 3,
 770 };
 771
 772 #define HF_GIF_MASK             (1 << 0)
 773 #define HF_HIF_MASK             (1 << 1)
 774 #define HF_VINTR_MASK           (1 << 2)
 775 #define HF_NMI_MASK             (1 << 3)
 776 #define HF_IRET_MASK            (1 << 4)
 777
 778 /*
 779  * Hardware virtualization extension instructions may fault if a
 780  * reboot turns off virtualization while processes are running.
 781  * Trap the fault and ignore the instruction if that happens.
 782  */
 783 asmlinkage void kvm_handle_fault_on_reboot(void);
 784
 785 #define __kvm_handle_fault_on_reboot(insn) \
 786         "666: " insn "\n\t" \
 787         ".pushsection .fixup, \"ax\" \n" \
 788         "667: \n\t" \
 789         __ASM_SIZE(push) " $666b \n\t"        \
 790         "jmp kvm_handle_fault_on_reboot \n\t" \
 791         ".popsection \n\t" \
 792         ".pushsection __ex_table, \"a\" \n\t" \
 793         _ASM_PTR " 666b, 667b \n\t" \
 794         ".popsection"
 795
 796 #define KVM_ARCH_WANT_MMU_NOTIFIER
 797 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 798 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 799 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 800
 801 #endif /* _ASM_X86_KVM_HOST_H */