include/asm-x86/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
  25 #define KVM_MAX_VCPUS 16
  26 #define KVM_MEMORY_SLOTS 32
  27 /* memory slots that does not exposed to userspace */
  28 #define KVM_PRIVATE_MEM_SLOTS 4
  29
  30 #define KVM_PIO_PAGE_OFFSET 1
  31 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
  32
  33 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  34 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  35 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  36                                   0xFFFFFF0000000000ULL)
  37
  38 #define KVM_GUEST_CR0_MASK                                 \
  39         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  40          | X86_CR0_NW | X86_CR0_CD)
  41 #define KVM_VM_CR0_ALWAYS_ON                                            \
  42         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  43          | X86_CR0_MP)
  44 #define KVM_GUEST_CR4_MASK                                              \
  45         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  46 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  47 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  48
  49 #define INVALID_PAGE (~(hpa_t)0)
  50 #define UNMAPPED_GVA (~(gpa_t)0)
  51
  52 /* shadow tables are PAE even on non-PAE hosts */
  53 #define KVM_HPAGE_SHIFT 21
  54 #define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
  55 #define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
  56
  57 #define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
  58
  59 #define DE_VECTOR 0
  60 #define DB_VECTOR 1
  61 #define BP_VECTOR 3
  62 #define OF_VECTOR 4
  63 #define BR_VECTOR 5
  64 #define UD_VECTOR 6
  65 #define NM_VECTOR 7
  66 #define DF_VECTOR 8
  67 #define TS_VECTOR 10
  68 #define NP_VECTOR 11
  69 #define SS_VECTOR 12
  70 #define GP_VECTOR 13
  71 #define PF_VECTOR 14
  72 #define MF_VECTOR 16
  73 #define MC_VECTOR 18
  74
  75 #define SELECTOR_TI_MASK (1 << 2)
  76 #define SELECTOR_RPL_MASK 0x03
  77
  78 #define IOPL_SHIFT 12
  79
  80 #define KVM_ALIAS_SLOTS 4
  81
  82 #define KVM_PERMILLE_MMU_PAGES 20
  83 #define KVM_MIN_ALLOC_MMU_PAGES 64
  84 #define KVM_MMU_HASH_SHIFT 10
  85 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  86 #define KVM_MIN_FREE_MMU_PAGES 5
  87 #define KVM_REFILL_PAGES 25
  88 #define KVM_MAX_CPUID_ENTRIES 40
  89 #define KVM_NR_VAR_MTRR 8
  90
  91 extern spinlock_t kvm_lock;
  92 extern struct list_head vm_list;
  93
  94 struct kvm_vcpu;
  95 struct kvm;
  96
  97 enum kvm_reg {
  98         VCPU_REGS_RAX = 0,
  99         VCPU_REGS_RCX = 1,
 100         VCPU_REGS_RDX = 2,
 101         VCPU_REGS_RBX = 3,
 102         VCPU_REGS_RSP = 4,
 103         VCPU_REGS_RBP = 5,
 104         VCPU_REGS_RSI = 6,
 105         VCPU_REGS_RDI = 7,
 106 #ifdef CONFIG_X86_64
 107         VCPU_REGS_R8 = 8,
 108         VCPU_REGS_R9 = 9,
 109         VCPU_REGS_R10 = 10,
 110         VCPU_REGS_R11 = 11,
 111         VCPU_REGS_R12 = 12,
 112         VCPU_REGS_R13 = 13,
 113         VCPU_REGS_R14 = 14,
 114         VCPU_REGS_R15 = 15,
 115 #endif
 116         VCPU_REGS_RIP,
 117         NR_VCPU_REGS
 118 };
 119
 120 enum {
 121         VCPU_SREG_ES,
 122         VCPU_SREG_CS,
 123         VCPU_SREG_SS,
 124         VCPU_SREG_DS,
 125         VCPU_SREG_FS,
 126         VCPU_SREG_GS,
 127         VCPU_SREG_TR,
 128         VCPU_SREG_LDTR,
 129 };
 130
 131 #include <asm/kvm_x86_emulate.h>
 132
 133 #define KVM_NR_MEM_OBJS 40
 134
 135 struct kvm_guest_debug {
 136         int enabled;
 137         unsigned long bp[4];
 138         int singlestep;
 139 };
 140
 141 /*
 142  * We don't want allocation failures within the mmu code, so we preallocate
 143  * enough memory for a single page fault in a cache.
 144  */
 145 struct kvm_mmu_memory_cache {
 146         int nobjs;
 147         void *objects[KVM_NR_MEM_OBJS];
 148 };
 149
 150 #define NR_PTE_CHAIN_ENTRIES 5
 151
 152 struct kvm_pte_chain {
 153         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 154         struct hlist_node link;
 155 };
 156
 157 /*
 158  * kvm_mmu_page_role, below, is defined as:
 159  *
 160  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 161  *   bits 4:7 - page table level for this shadow (1-4)
 162  *   bits 8:9 - page table quadrant for 2-level guests
 163  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 164  *   bits 17:19 - common access permissions for all ptes in this shadow page
 165  */
 166 union kvm_mmu_page_role {
 167         unsigned word;
 168         struct {
 169                 unsigned glevels:4;
 170                 unsigned level:4;
 171                 unsigned quadrant:2;
 172                 unsigned pad_for_nice_hex_output:6;
 173                 unsigned metaphysical:1;
 174                 unsigned access:3;
 175                 unsigned invalid:1;
 176         };
 177 };
 178
 179 struct kvm_mmu_page {
 180         struct list_head link;
 181         struct hlist_node hash_link;
 182
 183         /*
 184          * The following two entries are used to key the shadow page in the
 185          * hash table.
 186          */
 187         gfn_t gfn;
 188         union kvm_mmu_page_role role;
 189
 190         u64 *spt;
 191         /* hold the gfn of each spte inside spt */
 192         gfn_t *gfns;
 193         unsigned long slot_bitmap; /* One bit set per slot which has memory
 194                                     * in this shadow page.
 195                                     */
 196         int multimapped;         /* More than one parent_pte? */
 197         int root_count;          /* Currently serving as active root */
 198         union {
 199                 u64 *parent_pte;               /* !multimapped */
 200                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 201         };
 202 };
 203
 204 struct kvm_pv_mmu_op_buffer {
 205         void *ptr;
 206         unsigned len;
 207         unsigned processed;
 208         char buf[512] __aligned(sizeof(long));
 209 };
 210
 211 /*
 212  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 213  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 214  * mode.
 215  */
 216 struct kvm_mmu {
 217         void (*new_cr3)(struct kvm_vcpu *vcpu);
 218         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 219         void (*free)(struct kvm_vcpu *vcpu);
 220         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 221         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 222                               struct kvm_mmu_page *page);
 223         int (*sync_page)(struct kvm_vcpu *vcpu,
 224                          struct kvm_mmu_page *sp);
 225         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 226         hpa_t root_hpa;
 227         int root_level;
 228         int shadow_root_level;
 229
 230         u64 *pae_root;
 231 };
 232
 233 struct kvm_vcpu_arch {
 234         u64 host_tsc;
 235         int interrupt_window_open;
 236         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 237         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 238         /*
 239          * rip and regs accesses must go through
 240          * kvm_{register,rip}_{read,write} functions.
 241          */
 242         unsigned long regs[NR_VCPU_REGS];
 243         u32 regs_avail;
 244         u32 regs_dirty;
 245
 246         unsigned long cr0;
 247         unsigned long cr2;
 248         unsigned long cr3;
 249         unsigned long cr4;
 250         unsigned long cr8;
 251         u64 pdptrs[4]; /* pae */
 252         u64 shadow_efer;
 253         u64 apic_base;
 254         struct kvm_lapic *apic;    /* kernel irqchip context */
 255         int mp_state;
 256         int sipi_vector;
 257         u64 ia32_misc_enable_msr;
 258         bool tpr_access_reporting;
 259
 260         struct kvm_mmu mmu;
 261         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 262          * put it here to avoid allocation */
 263         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 264
 265         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 266         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 267         struct kvm_mmu_memory_cache mmu_page_cache;
 268         struct kvm_mmu_memory_cache mmu_page_header_cache;
 269
 270         gfn_t last_pt_write_gfn;
 271         int   last_pt_write_count;
 272         u64  *last_pte_updated;
 273         gfn_t last_pte_gfn;
 274
 275         struct {
 276                 gfn_t gfn;      /* presumed gfn during guest pte update */
 277                 pfn_t pfn;      /* pfn corresponding to that gfn */
 278                 int largepage;
 279                 unsigned long mmu_seq;
 280         } update_pte;
 281
 282         struct i387_fxsave_struct host_fx_image;
 283         struct i387_fxsave_struct guest_fx_image;
 284
 285         gva_t mmio_fault_cr2;
 286         struct kvm_pio_request pio;
 287         void *pio_data;
 288
 289         struct kvm_queued_exception {
 290                 bool pending;
 291                 bool has_error_code;
 292                 u8 nr;
 293                 u32 error_code;
 294         } exception;
 295
 296         struct kvm_queued_interrupt {
 297                 bool pending;
 298                 u8 nr;
 299         } interrupt;
 300
 301         struct {
 302                 int active;
 303                 u8 save_iopl;
 304                 struct kvm_save_segment {
 305                         u16 selector;
 306                         unsigned long base;
 307                         u32 limit;
 308                         u32 ar;
 309                 } tr, es, ds, fs, gs;
 310         } rmode;
 311         int halt_request; /* real mode on Intel only */
 312
 313         int cpuid_nent;
 314         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 315         /* emulate context */
 316
 317         struct x86_emulate_ctxt emulate_ctxt;
 318
 319         gpa_t time;
 320         struct pvclock_vcpu_time_info hv_clock;
 321         unsigned int hv_clock_tsc_khz;
 322         unsigned int time_offset;
 323         struct page *time_page;
 324
 325         bool nmi_pending;
 326         bool nmi_injected;
 327
 328         u64 mtrr[0x100];
 329 };
 330
 331 struct kvm_mem_alias {
 332         gfn_t base_gfn;
 333         unsigned long npages;
 334         gfn_t target_gfn;
 335 };
 336
 337 struct kvm_arch{
 338         int naliases;
 339         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 340
 341         unsigned int n_free_mmu_pages;
 342         unsigned int n_requested_mmu_pages;
 343         unsigned int n_alloc_mmu_pages;
 344         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 345         /*
 346          * Hash table of struct kvm_mmu_page.
 347          */
 348         struct list_head active_mmu_pages;
 349         struct list_head assigned_dev_head;
 350         struct dmar_domain *intel_iommu_domain;
 351         struct kvm_pic *vpic;
 352         struct kvm_ioapic *vioapic;
 353         struct kvm_pit *vpit;
 354         struct hlist_head irq_ack_notifier_list;
 355
 356         int round_robin_prev_vcpu;
 357         unsigned int tss_addr;
 358         struct page *apic_access_page;
 359
 360         gpa_t wall_clock;
 361
 362         struct page *ept_identity_pagetable;
 363         bool ept_identity_pagetable_done;
 364 };
 365
 366 struct kvm_vm_stat {
 367         u32 mmu_shadow_zapped;
 368         u32 mmu_pte_write;
 369         u32 mmu_pte_updated;
 370         u32 mmu_pde_zapped;
 371         u32 mmu_flooded;
 372         u32 mmu_recycled;
 373         u32 mmu_cache_miss;
 374         u32 remote_tlb_flush;
 375         u32 lpages;
 376 };
 377
 378 struct kvm_vcpu_stat {
 379         u32 pf_fixed;
 380         u32 pf_guest;
 381         u32 tlb_flush;
 382         u32 invlpg;
 383
 384         u32 exits;
 385         u32 io_exits;
 386         u32 mmio_exits;
 387         u32 signal_exits;
 388         u32 irq_window_exits;
 389         u32 nmi_window_exits;
 390         u32 halt_exits;
 391         u32 halt_wakeup;
 392         u32 request_irq_exits;
 393         u32 irq_exits;
 394         u32 host_state_reload;
 395         u32 efer_reload;
 396         u32 fpu_reload;
 397         u32 insn_emulation;
 398         u32 insn_emulation_fail;
 399         u32 hypercalls;
 400         u32 irq_injections;
 401 };
 402
 403 struct descriptor_table {
 404         u16 limit;
 405         unsigned long base;
 406 } __attribute__((packed));
 407
 408 struct kvm_x86_ops {
 409         int (*cpu_has_kvm_support)(void);          /* __init */
 410         int (*disabled_by_bios)(void);             /* __init */
 411         void (*hardware_enable)(void *dummy);      /* __init */
 412         void (*hardware_disable)(void *dummy);
 413         void (*check_processor_compatibility)(void *rtn);
 414         int (*hardware_setup)(void);               /* __init */
 415         void (*hardware_unsetup)(void);            /* __exit */
 416         bool (*cpu_has_accelerated_tpr)(void);
 417
 418         /* Create, but do not attach this VCPU */
 419         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 420         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 421         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 422
 423         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 424         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 425         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 426
 427         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 428                                struct kvm_debug_guest *dbg);
 429         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 430         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 431         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 432         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 433         void (*get_segment)(struct kvm_vcpu *vcpu,
 434                             struct kvm_segment *var, int seg);
 435         int (*get_cpl)(struct kvm_vcpu *vcpu);
 436         void (*set_segment)(struct kvm_vcpu *vcpu,
 437                             struct kvm_segment *var, int seg);
 438         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 439         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 440         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 441         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 442         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 443         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 444         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 445         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 446         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 447         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 448         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 449         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 450                        int *exception);
 451         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 452         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 453         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 454
 455         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 456
 457         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 458         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 459         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 460         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 461                                 unsigned char *hypercall_addr);
 462         int (*get_irq)(struct kvm_vcpu *vcpu);
 463         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 464         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 465                                 bool has_error_code, u32 error_code);
 466         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 467         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 468         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 469                                        struct kvm_run *run);
 470
 471         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 472         int (*get_tdp_level)(void);
 473 };
 474
 475 extern struct kvm_x86_ops *kvm_x86_ops;
 476
 477 int kvm_mmu_module_init(void);
 478 void kvm_mmu_module_exit(void);
 479
 480 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 481 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 482 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 483 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 484 void kvm_mmu_set_base_ptes(u64 base_pte);
 485 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 486                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 487
 488 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 489 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 490 void kvm_mmu_zap_all(struct kvm *kvm);
 491 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 492 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 493
 494 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 495
 496 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 497                           const void *val, int bytes);
 498 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 499                   gpa_t addr, unsigned long *ret);
 500
 501 int is_mmio_pfn(pfn_t pfn);
 502
 503 extern bool tdp_enabled;
 504
 505 enum emulation_result {
 506         EMULATE_DONE,       /* no further processing */
 507         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 508         EMULATE_FAIL,         /* can't emulate this instruction */
 509 };
 510
 511 #define EMULTYPE_NO_DECODE          (1 << 0)
 512 #define EMULTYPE_TRAP_UD            (1 << 1)
 513 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 514                         unsigned long cr2, u16 error_code, int emulation_type);
 515 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 516 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 517 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 518 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 519                    unsigned long *rflags);
 520
 521 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 522 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 523                      unsigned long *rflags);
 524 void kvm_enable_efer_bits(u64);
 525 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 526 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 527
 528 struct x86_emulate_ctxt;
 529
 530 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 531                      int size, unsigned port);
 532 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 533                            int size, unsigned long count, int down,
 534                             gva_t address, int rep, unsigned port);
 535 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 536 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 537 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 538 int emulate_clts(struct kvm_vcpu *vcpu);
 539 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 540                     unsigned long *dest);
 541 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 542                     unsigned long value);
 543
 544 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 545 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 546                                 int type_bits, int seg);
 547
 548 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 549
 550 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 551 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 552 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 553 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 554 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 555 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 556 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 557
 558 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 559 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 560
 561 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 562 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 563 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 564                            u32 error_code);
 565
 566 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 567
 568 void fx_init(struct kvm_vcpu *vcpu);
 569
 570 int emulator_read_std(unsigned long addr,
 571                       void *val,
 572                       unsigned int bytes,
 573                       struct kvm_vcpu *vcpu);
 574 int emulator_write_emulated(unsigned long addr,
 575                             const void *val,
 576                             unsigned int bytes,
 577                             struct kvm_vcpu *vcpu);
 578
 579 unsigned long segment_base(u16 selector);
 580
 581 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 582 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 583                        const u8 *new, int bytes);
 584 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 585 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 586 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 587 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 588 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 589
 590 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 591
 592 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 593
 594 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 595 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 596
 597 void kvm_enable_tdp(void);
 598 void kvm_disable_tdp(void);
 599
 600 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 601 int complete_pio(struct kvm_vcpu *vcpu);
 602
 603 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 604 {
 605         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 606
 607         return (struct kvm_mmu_page *)page_private(page);
 608 }
 609
 610 static inline u16 kvm_read_fs(void)
 611 {
 612         u16 seg;
 613         asm("mov %%fs, %0" : "=g"(seg));
 614         return seg;
 615 }
 616
 617 static inline u16 kvm_read_gs(void)
 618 {
 619         u16 seg;
 620         asm("mov %%gs, %0" : "=g"(seg));
 621         return seg;
 622 }
 623
 624 static inline u16 kvm_read_ldt(void)
 625 {
 626         u16 ldt;
 627         asm("sldt %0" : "=g"(ldt));
 628         return ldt;
 629 }
 630
 631 static inline void kvm_load_fs(u16 sel)
 632 {
 633         asm("mov %0, %%fs" : : "rm"(sel));
 634 }
 635
 636 static inline void kvm_load_gs(u16 sel)
 637 {
 638         asm("mov %0, %%gs" : : "rm"(sel));
 639 }
 640
 641 static inline void kvm_load_ldt(u16 sel)
 642 {
 643         asm("lldt %0" : : "rm"(sel));
 644 }
 645
 646 static inline void kvm_get_idt(struct descriptor_table *table)
 647 {
 648         asm("sidt %0" : "=m"(*table));
 649 }
 650
 651 static inline void kvm_get_gdt(struct descriptor_table *table)
 652 {
 653         asm("sgdt %0" : "=m"(*table));
 654 }
 655
 656 static inline unsigned long kvm_read_tr_base(void)
 657 {
 658         u16 tr;
 659         asm("str %0" : "=g"(tr));
 660         return segment_base(tr);
 661 }
 662
 663 #ifdef CONFIG_X86_64
 664 static inline unsigned long read_msr(unsigned long msr)
 665 {
 666         u64 value;
 667
 668         rdmsrl(msr, value);
 669         return value;
 670 }
 671 #endif
 672
 673 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 674 {
 675         asm("fxsave (%0)":: "r" (image));
 676 }
 677
 678 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 679 {
 680         asm("fxrstor (%0)":: "r" (image));
 681 }
 682
 683 static inline void kvm_fx_finit(void)
 684 {
 685         asm("finit");
 686 }
 687
 688 static inline u32 get_rdx_init_val(void)
 689 {
 690         return 0x600; /* P6 family */
 691 }
 692
 693 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 694 {
 695         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 696 }
 697
 698 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 699 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 700 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 701 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 702 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 703 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 704 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 705 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 706 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 707 #define ASM_VMX_INVEPT            ".byte 0x66, 0x0f, 0x38, 0x80, 0x08"
 708 #define ASM_VMX_INVVPID           ".byte 0x66, 0x0f, 0x38, 0x81, 0x08"
 709
 710 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 711
 712 #define TSS_IOPB_BASE_OFFSET 0x66
 713 #define TSS_BASE_SIZE 0x68
 714 #define TSS_IOPB_SIZE (65536 / 8)
 715 #define TSS_REDIRECTION_SIZE (256 / 8)
 716 #define RMODE_TSS_SIZE                                                  \
 717         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 718
 719 enum {
 720         TASK_SWITCH_CALL = 0,
 721         TASK_SWITCH_IRET = 1,
 722         TASK_SWITCH_JMP = 2,
 723         TASK_SWITCH_GATE = 3,
 724 };
 725
 726 /*
 727  * Hardware virtualization extension instructions may fault if a
 728  * reboot turns off virtualization while processes are running.
 729  * Trap the fault and ignore the instruction if that happens.
 730  */
 731 asmlinkage void kvm_handle_fault_on_reboot(void);
 732
 733 #define __kvm_handle_fault_on_reboot(insn) \
 734         "666: " insn "\n\t" \
 735         ".pushsection .fixup, \"ax\" \n" \
 736         "667: \n\t" \
 737         __ASM_SIZE(push) " $666b \n\t"        \
 738         "jmp kvm_handle_fault_on_reboot \n\t" \
 739         ".popsection \n\t" \
 740         ".pushsection __ex_table, \"a\" \n\t" \
 741         _ASM_PTR " 666b, 667b \n\t" \
 742         ".popsection"
 743
 744 #define KVM_ARCH_WANT_MMU_NOTIFIER
 745 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 746 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 747
 748 #endif /* ASM_X86__KVM_HOST_H */