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
  18 #include <linux/kvm.h>
  19 #include <linux/kvm_para.h>
  20 #include <linux/kvm_types.h>
  21
  22 #include <asm/pvclock-abi.h>
  23 #include <asm/desc.h>
  24 #include <asm/mtrr.h>
  25 #include <asm/msr-index.h>
  26
  27 #define KVM_MAX_VCPUS 16
  28 #define KVM_MEMORY_SLOTS 32
  29 /* memory slots that does not exposed to userspace */
  30 #define KVM_PRIVATE_MEM_SLOTS 4
  31
  32 #define KVM_PIO_PAGE_OFFSET 1
  33 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  34
  35 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  36 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  37 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  38                                   0xFFFFFF0000000000ULL)
  39
  40 #define KVM_GUEST_CR0_MASK                                 \
  41         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  42          | X86_CR0_NW | X86_CR0_CD)
  43 #define KVM_VM_CR0_ALWAYS_ON                                            \
  44         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  45          | X86_CR0_MP)
  46 #define KVM_GUEST_CR4_MASK                                              \
  47         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  48 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  49 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  50
  51 #define INVALID_PAGE (~(hpa_t)0)
  52 #define UNMAPPED_GVA (~(gpa_t)0)
  53
  54 /* shadow tables are PAE even on non-PAE hosts */
  55 #define KVM_HPAGE_SHIFT 21
  56 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  57 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  58
  59 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  60
  61 #define DE_VECTOR 0
  62 #define DB_VECTOR 1
  63 #define BP_VECTOR 3
  64 #define OF_VECTOR 4
  65 #define BR_VECTOR 5
  66 #define UD_VECTOR 6
  67 #define NM_VECTOR 7
  68 #define DF_VECTOR 8
  69 #define TS_VECTOR 10
  70 #define NP_VECTOR 11
  71 #define SS_VECTOR 12
  72 #define GP_VECTOR 13
  73 #define PF_VECTOR 14
  74 #define MF_VECTOR 16
  75 #define MC_VECTOR 18
  76
  77 #define SELECTOR_TI_MASK (1 << 2)
  78 #define SELECTOR_RPL_MASK 0x03
  79
  80 #define IOPL_SHIFT 12
  81
  82 #define KVM_ALIAS_SLOTS 4
  83
  84 #define KVM_PERMILLE_MMU_PAGES 20
  85 #define KVM_MIN_ALLOC_MMU_PAGES 64
  86 #define KVM_MMU_HASH_SHIFT 10
  87 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  88 #define KVM_MIN_FREE_MMU_PAGES 5
  89 #define KVM_REFILL_PAGES 25
  90 #define KVM_MAX_CPUID_ENTRIES 40
  91 #define KVM_NR_FIXED_MTRR_REGION 88
  92 #define KVM_NR_VAR_MTRR 8
  93
  94 extern spinlock_t kvm_lock;
  95 extern struct list_head vm_list;
  96
  97 struct kvm_vcpu;
  98 struct kvm;
  99
 100 enum kvm_reg {
 101         VCPU_REGS_RAX = 0,
 102         VCPU_REGS_RCX = 1,
 103         VCPU_REGS_RDX = 2,
 104         VCPU_REGS_RBX = 3,
 105         VCPU_REGS_RSP = 4,
 106         VCPU_REGS_RBP = 5,
 107         VCPU_REGS_RSI = 6,
 108         VCPU_REGS_RDI = 7,
 109 #ifdef CONFIG_X86_64
 110         VCPU_REGS_R8 = 8,
 111         VCPU_REGS_R9 = 9,
 112         VCPU_REGS_R10 = 10,
 113         VCPU_REGS_R11 = 11,
 114         VCPU_REGS_R12 = 12,
 115         VCPU_REGS_R13 = 13,
 116         VCPU_REGS_R14 = 14,
 117         VCPU_REGS_R15 = 15,
 118 #endif
 119         VCPU_REGS_RIP,
 120         NR_VCPU_REGS
 121 };
 122
 123 enum {
 124         VCPU_SREG_ES,
 125         VCPU_SREG_CS,
 126         VCPU_SREG_SS,
 127         VCPU_SREG_DS,
 128         VCPU_SREG_FS,
 129         VCPU_SREG_GS,
 130         VCPU_SREG_TR,
 131         VCPU_SREG_LDTR,
 132 };
 133
 134 #include <asm/kvm_x86_emulate.h>
 135
 136 #define KVM_NR_MEM_OBJS 40
 137
 138 #define KVM_NR_DB_REGS  4
 139
 140 #define DR6_BD          (1 << 13)
 141 #define DR6_BS          (1 << 14)
 142 #define DR6_FIXED_1     0xffff0ff0
 143 #define DR6_VOLATILE    0x0000e00f
 144
 145 #define DR7_BP_EN_MASK  0x000000ff
 146 #define DR7_GE          (1 << 9)
 147 #define DR7_GD          (1 << 13)
 148 #define DR7_FIXED_1     0x00000400
 149 #define DR7_VOLATILE    0xffff23ff
 150
 151 /*
 152  * We don't want allocation failures within the mmu code, so we preallocate
 153  * enough memory for a single page fault in a cache.
 154  */
 155 struct kvm_mmu_memory_cache {
 156         int nobjs;
 157         void *objects[KVM_NR_MEM_OBJS];
 158 };
 159
 160 #define NR_PTE_CHAIN_ENTRIES 5
 161
 162 struct kvm_pte_chain {
 163         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 164         struct hlist_node link;
 165 };
 166
 167 /*
 168  * kvm_mmu_page_role, below, is defined as:
 169  *
 170  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 171  *   bits 4:7 - page table level for this shadow (1-4)
 172  *   bits 8:9 - page table quadrant for 2-level guests
 173  *   bit   16 - direct mapping of virtual to physical mapping at gfn
 174  *              used for real mode and two-dimensional paging
 175  *   bits 17:19 - common access permissions for all ptes in this shadow page
 176  */
 177 union kvm_mmu_page_role {
 178         unsigned word;
 179         struct {
 180                 unsigned glevels:4;
 181                 unsigned level:4;
 182                 unsigned quadrant:2;
 183                 unsigned pad_for_nice_hex_output:6;
 184                 unsigned direct:1;
 185                 unsigned access:3;
 186                 unsigned invalid:1;
 187                 unsigned cr4_pge:1;
 188                 unsigned nxe:1;
 189         };
 190 };
 191
 192 struct kvm_mmu_page {
 193         struct list_head link;
 194         struct hlist_node hash_link;
 195
 196         struct list_head oos_link;
 197
 198         /*
 199          * The following two entries are used to key the shadow page in the
 200          * hash table.
 201          */
 202         gfn_t gfn;
 203         union kvm_mmu_page_role role;
 204
 205         u64 *spt;
 206         /* hold the gfn of each spte inside spt */
 207         gfn_t *gfns;
 208         /*
 209          * One bit set per slot which has memory
 210          * in this shadow page.
 211          */
 212         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 213         int multimapped;         /* More than one parent_pte? */
 214         int root_count;          /* Currently serving as active root */
 215         bool unsync;
 216         unsigned int unsync_children;
 217         union {
 218                 u64 *parent_pte;               /* !multimapped */
 219                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 220         };
 221         DECLARE_BITMAP(unsync_child_bitmap, 512);
 222 };
 223
 224 struct kvm_pv_mmu_op_buffer {
 225         void *ptr;
 226         unsigned len;
 227         unsigned processed;
 228         char buf[512] __aligned(sizeof(long));
 229 };
 230
 231 struct kvm_pio_request {
 232         unsigned long count;
 233         int cur_count;
 234         gva_t guest_gva;
 235         int in;
 236         int port;
 237         int size;
 238         int string;
 239         int down;
 240         int rep;
 241 };
 242
 243 /*
 244  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 245  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 246  * mode.
 247  */
 248 struct kvm_mmu {
 249         void (*new_cr3)(struct kvm_vcpu *vcpu);
 250         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 251         void (*free)(struct kvm_vcpu *vcpu);
 252         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 253         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 254                               struct kvm_mmu_page *page);
 255         int (*sync_page)(struct kvm_vcpu *vcpu,
 256                          struct kvm_mmu_page *sp);
 257         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 258         hpa_t root_hpa;
 259         int root_level;
 260         int shadow_root_level;
 261         union kvm_mmu_page_role base_role;
 262
 263         u64 *pae_root;
 264         u64 rsvd_bits_mask[2][4];
 265 };
 266
 267 struct kvm_vcpu_arch {
 268         u64 host_tsc;
 269         /*
 270          * rip and regs accesses must go through
 271          * kvm_{register,rip}_{read,write} functions.
 272          */
 273         unsigned long regs[NR_VCPU_REGS];
 274         u32 regs_avail;
 275         u32 regs_dirty;
 276
 277         unsigned long cr0;
 278         unsigned long cr2;
 279         unsigned long cr3;
 280         unsigned long cr4;
 281         unsigned long cr8;
 282         u32 hflags;
 283         u64 pdptrs[4]; /* pae */
 284         u64 shadow_efer;
 285         u64 apic_base;
 286         struct kvm_lapic *apic;    /* kernel irqchip context */
 287         int32_t apic_arb_prio;
 288         int mp_state;
 289         int sipi_vector;
 290         u64 ia32_misc_enable_msr;
 291         bool tpr_access_reporting;
 292
 293         struct kvm_mmu mmu;
 294         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 295          * put it here to avoid allocation */
 296         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 297
 298         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 299         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 300         struct kvm_mmu_memory_cache mmu_page_cache;
 301         struct kvm_mmu_memory_cache mmu_page_header_cache;
 302
 303         gfn_t last_pt_write_gfn;
 304         int   last_pt_write_count;
 305         u64  *last_pte_updated;
 306         gfn_t last_pte_gfn;
 307
 308         struct {
 309                 gfn_t gfn;      /* presumed gfn during guest pte update */
 310                 pfn_t pfn;      /* pfn corresponding to that gfn */
 311                 int largepage;
 312                 unsigned long mmu_seq;
 313         } update_pte;
 314
 315         struct i387_fxsave_struct host_fx_image;
 316         struct i387_fxsave_struct guest_fx_image;
 317
 318         gva_t mmio_fault_cr2;
 319         struct kvm_pio_request pio;
 320         void *pio_data;
 321
 322         u8 event_exit_inst_len;
 323
 324         struct kvm_queued_exception {
 325                 bool pending;
 326                 bool has_error_code;
 327                 u8 nr;
 328                 u32 error_code;
 329         } exception;
 330
 331         struct kvm_queued_interrupt {
 332                 bool pending;
 333                 bool soft;
 334                 u8 nr;
 335         } interrupt;
 336
 337         struct {
 338                 int vm86_active;
 339                 u8 save_iopl;
 340                 struct kvm_save_segment {
 341                         u16 selector;
 342                         unsigned long base;
 343                         u32 limit;
 344                         u32 ar;
 345                 } tr, es, ds, fs, gs;
 346         } rmode;
 347         int halt_request; /* real mode on Intel only */
 348
 349         int cpuid_nent;
 350         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 351         /* emulate context */
 352
 353         struct x86_emulate_ctxt emulate_ctxt;
 354
 355         gpa_t time;
 356         struct pvclock_vcpu_time_info hv_clock;
 357         unsigned int hv_clock_tsc_khz;
 358         unsigned int time_offset;
 359         struct page *time_page;
 360
 361         bool singlestep; /* guest is single stepped by KVM */
 362         bool nmi_pending;
 363         bool nmi_injected;
 364
 365         struct mtrr_state_type mtrr_state;
 366         u32 pat;
 367
 368         int switch_db_regs;
 369         unsigned long host_db[KVM_NR_DB_REGS];
 370         unsigned long host_dr6;
 371         unsigned long host_dr7;
 372         unsigned long db[KVM_NR_DB_REGS];
 373         unsigned long dr6;
 374         unsigned long dr7;
 375         unsigned long eff_db[KVM_NR_DB_REGS];
 376 };
 377
 378 struct kvm_mem_alias {
 379         gfn_t base_gfn;
 380         unsigned long npages;
 381         gfn_t target_gfn;
 382 };
 383
 384 struct kvm_arch{
 385         int naliases;
 386         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 387
 388         unsigned int n_free_mmu_pages;
 389         unsigned int n_requested_mmu_pages;
 390         unsigned int n_alloc_mmu_pages;
 391         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 392         /*
 393          * Hash table of struct kvm_mmu_page.
 394          */
 395         struct list_head active_mmu_pages;
 396         struct list_head assigned_dev_head;
 397         struct iommu_domain *iommu_domain;
 398         int iommu_flags;
 399         struct kvm_pic *vpic;
 400         struct kvm_ioapic *vioapic;
 401         struct kvm_pit *vpit;
 402         struct hlist_head irq_ack_notifier_list;
 403         int vapics_in_nmi_mode;
 404
 405         unsigned int tss_addr;
 406         struct page *apic_access_page;
 407
 408         gpa_t wall_clock;
 409
 410         struct page *ept_identity_pagetable;
 411         bool ept_identity_pagetable_done;
 412
 413         unsigned long irq_sources_bitmap;
 414         unsigned long irq_states[KVM_IOAPIC_NUM_PINS];
 415         u64 vm_init_tsc;
 416 };
 417
 418 struct kvm_vm_stat {
 419         u32 mmu_shadow_zapped;
 420         u32 mmu_pte_write;
 421         u32 mmu_pte_updated;
 422         u32 mmu_pde_zapped;
 423         u32 mmu_flooded;
 424         u32 mmu_recycled;
 425         u32 mmu_cache_miss;
 426         u32 mmu_unsync;
 427         u32 remote_tlb_flush;
 428         u32 lpages;
 429 };
 430
 431 struct kvm_vcpu_stat {
 432         u32 pf_fixed;
 433         u32 pf_guest;
 434         u32 tlb_flush;
 435         u32 invlpg;
 436
 437         u32 exits;
 438         u32 io_exits;
 439         u32 mmio_exits;
 440         u32 signal_exits;
 441         u32 irq_window_exits;
 442         u32 nmi_window_exits;
 443         u32 halt_exits;
 444         u32 halt_wakeup;
 445         u32 request_irq_exits;
 446         u32 irq_exits;
 447         u32 host_state_reload;
 448         u32 efer_reload;
 449         u32 fpu_reload;
 450         u32 insn_emulation;
 451         u32 insn_emulation_fail;
 452         u32 hypercalls;
 453         u32 irq_injections;
 454         u32 nmi_injections;
 455 };
 456
 457 struct descriptor_table {
 458         u16 limit;
 459         unsigned long base;
 460 } __attribute__((packed));
 461
 462 struct kvm_x86_ops {
 463         int (*cpu_has_kvm_support)(void);          /* __init */
 464         int (*disabled_by_bios)(void);             /* __init */
 465         void (*hardware_enable)(void *dummy);      /* __init */
 466         void (*hardware_disable)(void *dummy);
 467         void (*check_processor_compatibility)(void *rtn);
 468         int (*hardware_setup)(void);               /* __init */
 469         void (*hardware_unsetup)(void);            /* __exit */
 470         bool (*cpu_has_accelerated_tpr)(void);
 471
 472         /* Create, but do not attach this VCPU */
 473         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 474         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 475         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 476
 477         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 478         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 479         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 480
 481         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 482                                struct kvm_guest_debug *dbg);
 483         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 484         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 485         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 486         void (*get_segment)(struct kvm_vcpu *vcpu,
 487                             struct kvm_segment *var, int seg);
 488         int (*get_cpl)(struct kvm_vcpu *vcpu);
 489         void (*set_segment)(struct kvm_vcpu *vcpu,
 490                             struct kvm_segment *var, int seg);
 491         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 492         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 493         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 494         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 495         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 496         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 497         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 498         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 499         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 500         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 501         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 502         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 503                        int *exception);
 504         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 505         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 506         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 507
 508         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 509
 510         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 511         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 512         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 513         void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 514         u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 515         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 516                                 unsigned char *hypercall_addr);
 517         void (*set_irq)(struct kvm_vcpu *vcpu);
 518         void (*set_nmi)(struct kvm_vcpu *vcpu);
 519         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 520                                 bool has_error_code, u32 error_code);
 521         int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 522         int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 523         void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 524         void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 525         void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
 526         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 527         int (*get_tdp_level)(void);
 528         u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 529 };
 530
 531 extern struct kvm_x86_ops *kvm_x86_ops;
 532
 533 int kvm_mmu_module_init(void);
 534 void kvm_mmu_module_exit(void);
 535
 536 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 537 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 538 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 539 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 540 void kvm_mmu_set_base_ptes(u64 base_pte);
 541 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 542                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 543
 544 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 545 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 546 void kvm_mmu_zap_all(struct kvm *kvm);
 547 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 548 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 549
 550 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 551
 552 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 553                           const void *val, int bytes);
 554 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 555                   gpa_t addr, unsigned long *ret);
 556 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 557
 558 extern bool tdp_enabled;
 559
 560 enum emulation_result {
 561         EMULATE_DONE,       /* no further processing */
 562         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 563         EMULATE_FAIL,         /* can't emulate this instruction */
 564 };
 565
 566 #define EMULTYPE_NO_DECODE          (1 << 0)
 567 #define EMULTYPE_TRAP_UD            (1 << 1)
 568 #define EMULTYPE_SKIP               (1 << 2)
 569 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 570                         unsigned long cr2, u16 error_code, int emulation_type);
 571 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 572 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 573 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 574 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 575                    unsigned long *rflags);
 576
 577 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 578 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 579                      unsigned long *rflags);
 580 void kvm_enable_efer_bits(u64);
 581 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 582 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 583
 584 struct x86_emulate_ctxt;
 585
 586 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 587                      int size, unsigned port);
 588 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 589                            int size, unsigned long count, int down,
 590                             gva_t address, int rep, unsigned port);
 591 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 592 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 593 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 594 int emulate_clts(struct kvm_vcpu *vcpu);
 595 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 596                     unsigned long *dest);
 597 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 598                     unsigned long value);
 599
 600 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 601 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 602                                 int type_bits, int seg);
 603
 604 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 605
 606 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 607 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 608 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 609 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 610 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 611 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 612 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 613
 614 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 615 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 616
 617 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 618 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 619 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 620                            u32 error_code);
 621
 622 int kvm_pic_set_irq(void *opaque, int irq, int level);
 623
 624 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 625
 626 void fx_init(struct kvm_vcpu *vcpu);
 627
 628 int emulator_write_emulated(unsigned long addr,
 629                             const void *val,
 630                             unsigned int bytes,
 631                             struct kvm_vcpu *vcpu);
 632
 633 unsigned long segment_base(u16 selector);
 634
 635 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 636 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 637                        const u8 *new, int bytes,
 638                        bool guest_initiated);
 639 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 640 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 641 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 642 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 643 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 644
 645 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 646
 647 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 648
 649 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 650 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 651
 652 void kvm_enable_tdp(void);
 653 void kvm_disable_tdp(void);
 654
 655 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 656 int complete_pio(struct kvm_vcpu *vcpu);
 657
 658 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 659
 660 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 661 {
 662         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 663
 664         return (struct kvm_mmu_page *)page_private(page);
 665 }
 666
 667 static inline u16 kvm_read_fs(void)
 668 {
 669         u16 seg;
 670         asm("mov %%fs, %0" : "=g"(seg));
 671         return seg;
 672 }
 673
 674 static inline u16 kvm_read_gs(void)
 675 {
 676         u16 seg;
 677         asm("mov %%gs, %0" : "=g"(seg));
 678         return seg;
 679 }
 680
 681 static inline u16 kvm_read_ldt(void)
 682 {
 683         u16 ldt;
 684         asm("sldt %0" : "=g"(ldt));
 685         return ldt;
 686 }
 687
 688 static inline void kvm_load_fs(u16 sel)
 689 {
 690         asm("mov %0, %%fs" : : "rm"(sel));
 691 }
 692
 693 static inline void kvm_load_gs(u16 sel)
 694 {
 695         asm("mov %0, %%gs" : : "rm"(sel));
 696 }
 697
 698 static inline void kvm_load_ldt(u16 sel)
 699 {
 700         asm("lldt %0" : : "rm"(sel));
 701 }
 702
 703 static inline void kvm_get_idt(struct descriptor_table *table)
 704 {
 705         asm("sidt %0" : "=m"(*table));
 706 }
 707
 708 static inline void kvm_get_gdt(struct descriptor_table *table)
 709 {
 710         asm("sgdt %0" : "=m"(*table));
 711 }
 712
 713 static inline unsigned long kvm_read_tr_base(void)
 714 {
 715         u16 tr;
 716         asm("str %0" : "=g"(tr));
 717         return segment_base(tr);
 718 }
 719
 720 #ifdef CONFIG_X86_64
 721 static inline unsigned long read_msr(unsigned long msr)
 722 {
 723         u64 value;
 724
 725         rdmsrl(msr, value);
 726         return value;
 727 }
 728 #endif
 729
 730 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 731 {
 732         asm("fxsave (%0)":: "r" (image));
 733 }
 734
 735 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 736 {
 737         asm("fxrstor (%0)":: "r" (image));
 738 }
 739
 740 static inline void kvm_fx_finit(void)
 741 {
 742         asm("finit");
 743 }
 744
 745 static inline u32 get_rdx_init_val(void)
 746 {
 747         return 0x600; /* P6 family */
 748 }
 749
 750 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 751 {
 752         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 753 }
 754
 755 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 756
 757 #define TSS_IOPB_BASE_OFFSET 0x66
 758 #define TSS_BASE_SIZE 0x68
 759 #define TSS_IOPB_SIZE (65536 / 8)
 760 #define TSS_REDIRECTION_SIZE (256 / 8)
 761 #define RMODE_TSS_SIZE                                                  \
 762         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 763
 764 enum {
 765         TASK_SWITCH_CALL = 0,
 766         TASK_SWITCH_IRET = 1,
 767         TASK_SWITCH_JMP = 2,
 768         TASK_SWITCH_GATE = 3,
 769 };
 770
 771 #define HF_GIF_MASK             (1 << 0)
 772 #define HF_HIF_MASK             (1 << 1)
 773 #define HF_VINTR_MASK           (1 << 2)
 774 #define HF_NMI_MASK             (1 << 3)
 775 #define HF_IRET_MASK            (1 << 4)
 776
 777 /*
 778  * Hardware virtualization extension instructions may fault if a
 779  * reboot turns off virtualization while processes are running.
 780  * Trap the fault and ignore the instruction if that happens.
 781  */
 782 asmlinkage void kvm_handle_fault_on_reboot(void);
 783
 784 #define __kvm_handle_fault_on_reboot(insn) \
 785         "666: " insn "\n\t" \
 786         ".pushsection .fixup, \"ax\" \n" \
 787         "667: \n\t" \
 788         __ASM_SIZE(push) " $666b \n\t"        \
 789         "jmp kvm_handle_fault_on_reboot \n\t" \
 790         ".popsection \n\t" \
 791         ".pushsection __ex_table, \"a\" \n\t" \
 792         _ASM_PTR " 666b, 667b \n\t" \
 793         ".popsection"
 794
 795 #define KVM_ARCH_WANT_MMU_NOTIFIER
 796 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 797 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 798 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 799
 800 #endif /* _ASM_X86_KVM_HOST_H */