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 /*
 205  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 206  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 207  * mode.
 208  */
 209 struct kvm_mmu {
 210         void (*new_cr3)(struct kvm_vcpu *vcpu);
 211         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 212         void (*free)(struct kvm_vcpu *vcpu);
 213         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 214         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 215                               struct kvm_mmu_page *page);
 216         hpa_t root_hpa;
 217         int root_level;
 218         int shadow_root_level;
 219
 220         u64 *pae_root;
 221 };
 222
 223 struct kvm_vcpu_arch {
 224         u64 host_tsc;
 225         int interrupt_window_open;
 226         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 227         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 228         /*
 229          * rip and regs accesses must go through
 230          * kvm_{register,rip}_{read,write} functions.
 231          */
 232         unsigned long regs[NR_VCPU_REGS];
 233         u32 regs_avail;
 234         u32 regs_dirty;
 235
 236         unsigned long cr0;
 237         unsigned long cr2;
 238         unsigned long cr3;
 239         unsigned long cr4;
 240         unsigned long cr8;
 241         u64 pdptrs[4]; /* pae */
 242         u64 shadow_efer;
 243         u64 apic_base;
 244         struct kvm_lapic *apic;    /* kernel irqchip context */
 245         int mp_state;
 246         int sipi_vector;
 247         u64 ia32_misc_enable_msr;
 248         bool tpr_access_reporting;
 249
 250         struct kvm_mmu mmu;
 251
 252         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 253         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 254         struct kvm_mmu_memory_cache mmu_page_cache;
 255         struct kvm_mmu_memory_cache mmu_page_header_cache;
 256
 257         gfn_t last_pt_write_gfn;
 258         int   last_pt_write_count;
 259         u64  *last_pte_updated;
 260         gfn_t last_pte_gfn;
 261
 262         struct {
 263                 gfn_t gfn;      /* presumed gfn during guest pte update */
 264                 pfn_t pfn;      /* pfn corresponding to that gfn */
 265                 int largepage;
 266                 unsigned long mmu_seq;
 267         } update_pte;
 268
 269         struct i387_fxsave_struct host_fx_image;
 270         struct i387_fxsave_struct guest_fx_image;
 271
 272         gva_t mmio_fault_cr2;
 273         struct kvm_pio_request pio;
 274         void *pio_data;
 275
 276         struct kvm_queued_exception {
 277                 bool pending;
 278                 bool has_error_code;
 279                 u8 nr;
 280                 u32 error_code;
 281         } exception;
 282
 283         struct kvm_queued_interrupt {
 284                 bool pending;
 285                 u8 nr;
 286         } interrupt;
 287
 288         struct {
 289                 int active;
 290                 u8 save_iopl;
 291                 struct kvm_save_segment {
 292                         u16 selector;
 293                         unsigned long base;
 294                         u32 limit;
 295                         u32 ar;
 296                 } tr, es, ds, fs, gs;
 297         } rmode;
 298         int halt_request; /* real mode on Intel only */
 299
 300         int cpuid_nent;
 301         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 302         /* emulate context */
 303
 304         struct x86_emulate_ctxt emulate_ctxt;
 305
 306         gpa_t time;
 307         struct pvclock_vcpu_time_info hv_clock;
 308         unsigned int hv_clock_tsc_khz;
 309         unsigned int time_offset;
 310         struct page *time_page;
 311
 312         bool nmi_pending;
 313         bool nmi_injected;
 314
 315         u64 mtrr[0x100];
 316 };
 317
 318 struct kvm_mem_alias {
 319         gfn_t base_gfn;
 320         unsigned long npages;
 321         gfn_t target_gfn;
 322 };
 323
 324 struct kvm_irq_ack_notifier {
 325         struct hlist_node link;
 326         unsigned gsi;
 327         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 328 };
 329
 330 struct kvm_arch{
 331         int naliases;
 332         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 333
 334         unsigned int n_free_mmu_pages;
 335         unsigned int n_requested_mmu_pages;
 336         unsigned int n_alloc_mmu_pages;
 337         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 338         /*
 339          * Hash table of struct kvm_mmu_page.
 340          */
 341         struct list_head active_mmu_pages;
 342         struct kvm_pic *vpic;
 343         struct kvm_ioapic *vioapic;
 344         struct kvm_pit *vpit;
 345         struct hlist_head irq_ack_notifier_list;
 346
 347         int round_robin_prev_vcpu;
 348         unsigned int tss_addr;
 349         struct page *apic_access_page;
 350
 351         gpa_t wall_clock;
 352
 353         struct page *ept_identity_pagetable;
 354         bool ept_identity_pagetable_done;
 355 };
 356
 357 struct kvm_vm_stat {
 358         u32 mmu_shadow_zapped;
 359         u32 mmu_pte_write;
 360         u32 mmu_pte_updated;
 361         u32 mmu_pde_zapped;
 362         u32 mmu_flooded;
 363         u32 mmu_recycled;
 364         u32 mmu_cache_miss;
 365         u32 remote_tlb_flush;
 366         u32 lpages;
 367 };
 368
 369 struct kvm_vcpu_stat {
 370         u32 pf_fixed;
 371         u32 pf_guest;
 372         u32 tlb_flush;
 373         u32 invlpg;
 374
 375         u32 exits;
 376         u32 io_exits;
 377         u32 mmio_exits;
 378         u32 signal_exits;
 379         u32 irq_window_exits;
 380         u32 nmi_window_exits;
 381         u32 halt_exits;
 382         u32 halt_wakeup;
 383         u32 request_irq_exits;
 384         u32 irq_exits;
 385         u32 host_state_reload;
 386         u32 efer_reload;
 387         u32 fpu_reload;
 388         u32 insn_emulation;
 389         u32 insn_emulation_fail;
 390         u32 hypercalls;
 391 };
 392
 393 struct descriptor_table {
 394         u16 limit;
 395         unsigned long base;
 396 } __attribute__((packed));
 397
 398 struct kvm_x86_ops {
 399         int (*cpu_has_kvm_support)(void);          /* __init */
 400         int (*disabled_by_bios)(void);             /* __init */
 401         void (*hardware_enable)(void *dummy);      /* __init */
 402         void (*hardware_disable)(void *dummy);
 403         void (*check_processor_compatibility)(void *rtn);
 404         int (*hardware_setup)(void);               /* __init */
 405         void (*hardware_unsetup)(void);            /* __exit */
 406         bool (*cpu_has_accelerated_tpr)(void);
 407
 408         /* Create, but do not attach this VCPU */
 409         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 410         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 411         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 412
 413         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 414         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 415         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 416
 417         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 418                                struct kvm_debug_guest *dbg);
 419         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 420         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 421         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 422         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 423         void (*get_segment)(struct kvm_vcpu *vcpu,
 424                             struct kvm_segment *var, int seg);
 425         int (*get_cpl)(struct kvm_vcpu *vcpu);
 426         void (*set_segment)(struct kvm_vcpu *vcpu,
 427                             struct kvm_segment *var, int seg);
 428         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 429         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 430         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 431         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 432         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 433         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 434         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 435         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 436         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 437         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 438         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 439         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 440                        int *exception);
 441         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 442         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 443         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 444
 445         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 446
 447         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 448         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 449         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 450         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 451                                 unsigned char *hypercall_addr);
 452         int (*get_irq)(struct kvm_vcpu *vcpu);
 453         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 454         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 455                                 bool has_error_code, u32 error_code);
 456         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 457         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 458         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 459                                        struct kvm_run *run);
 460
 461         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 462         int (*get_tdp_level)(void);
 463 };
 464
 465 extern struct kvm_x86_ops *kvm_x86_ops;
 466
 467 int kvm_mmu_module_init(void);
 468 void kvm_mmu_module_exit(void);
 469
 470 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 471 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 472 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 473 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 474 void kvm_mmu_set_base_ptes(u64 base_pte);
 475 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 476                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 477
 478 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 479 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 480 void kvm_mmu_zap_all(struct kvm *kvm);
 481 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 482 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 483
 484 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 485
 486 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 487                           const void *val, int bytes);
 488 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 489                   gpa_t addr, unsigned long *ret);
 490
 491 extern bool tdp_enabled;
 492
 493 enum emulation_result {
 494         EMULATE_DONE,       /* no further processing */
 495         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 496         EMULATE_FAIL,         /* can't emulate this instruction */
 497 };
 498
 499 #define EMULTYPE_NO_DECODE          (1 << 0)
 500 #define EMULTYPE_TRAP_UD            (1 << 1)
 501 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 502                         unsigned long cr2, u16 error_code, int emulation_type);
 503 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 504 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 505 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 506 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 507                    unsigned long *rflags);
 508
 509 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 510 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 511                      unsigned long *rflags);
 512 void kvm_enable_efer_bits(u64);
 513 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 514 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 515
 516 struct x86_emulate_ctxt;
 517
 518 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 519                      int size, unsigned port);
 520 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 521                            int size, unsigned long count, int down,
 522                             gva_t address, int rep, unsigned port);
 523 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 524 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 525 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 526 int emulate_clts(struct kvm_vcpu *vcpu);
 527 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 528                     unsigned long *dest);
 529 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 530                     unsigned long value);
 531
 532 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 533 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
 534                                 int type_bits, int seg);
 535
 536 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 537
 538 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 539 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 540 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 541 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 542 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 543 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 544 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 545
 546 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 547 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 548
 549 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 550 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 551 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 552                            u32 error_code);
 553
 554 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 555
 556 void fx_init(struct kvm_vcpu *vcpu);
 557
 558 int emulator_read_std(unsigned long addr,
 559                       void *val,
 560                       unsigned int bytes,
 561                       struct kvm_vcpu *vcpu);
 562 int emulator_write_emulated(unsigned long addr,
 563                             const void *val,
 564                             unsigned int bytes,
 565                             struct kvm_vcpu *vcpu);
 566
 567 unsigned long segment_base(u16 selector);
 568
 569 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 570 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 571                        const u8 *new, int bytes);
 572 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 573 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 574 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 575 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 576
 577 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 578
 579 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 580
 581 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 582
 583 void kvm_enable_tdp(void);
 584 void kvm_disable_tdp(void);
 585
 586 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 587 int complete_pio(struct kvm_vcpu *vcpu);
 588
 589 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 590 {
 591         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 592
 593         return (struct kvm_mmu_page *)page_private(page);
 594 }
 595
 596 static inline u16 kvm_read_fs(void)
 597 {
 598         u16 seg;
 599         asm("mov %%fs, %0" : "=g"(seg));
 600         return seg;
 601 }
 602
 603 static inline u16 kvm_read_gs(void)
 604 {
 605         u16 seg;
 606         asm("mov %%gs, %0" : "=g"(seg));
 607         return seg;
 608 }
 609
 610 static inline u16 kvm_read_ldt(void)
 611 {
 612         u16 ldt;
 613         asm("sldt %0" : "=g"(ldt));
 614         return ldt;
 615 }
 616
 617 static inline void kvm_load_fs(u16 sel)
 618 {
 619         asm("mov %0, %%fs" : : "rm"(sel));
 620 }
 621
 622 static inline void kvm_load_gs(u16 sel)
 623 {
 624         asm("mov %0, %%gs" : : "rm"(sel));
 625 }
 626
 627 static inline void kvm_load_ldt(u16 sel)
 628 {
 629         asm("lldt %0" : : "rm"(sel));
 630 }
 631
 632 static inline void kvm_get_idt(struct descriptor_table *table)
 633 {
 634         asm("sidt %0" : "=m"(*table));
 635 }
 636
 637 static inline void kvm_get_gdt(struct descriptor_table *table)
 638 {
 639         asm("sgdt %0" : "=m"(*table));
 640 }
 641
 642 static inline unsigned long kvm_read_tr_base(void)
 643 {
 644         u16 tr;
 645         asm("str %0" : "=g"(tr));
 646         return segment_base(tr);
 647 }
 648
 649 #ifdef CONFIG_X86_64
 650 static inline unsigned long read_msr(unsigned long msr)
 651 {
 652         u64 value;
 653
 654         rdmsrl(msr, value);
 655         return value;
 656 }
 657 #endif
 658
 659 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 660 {
 661         asm("fxsave (%0)":: "r" (image));
 662 }
 663
 664 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 665 {
 666         asm("fxrstor (%0)":: "r" (image));
 667 }
 668
 669 static inline void kvm_fx_finit(void)
 670 {
 671         asm("finit");
 672 }
 673
 674 static inline u32 get_rdx_init_val(void)
 675 {
 676         return 0x600; /* P6 family */
 677 }
 678
 679 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 680 {
 681         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 682 }
 683
 684 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 685 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 686 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 687 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 688 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 689 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 690 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 691 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 692 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 693 #define ASM_VMX_INVEPT            ".byte 0x66, 0x0f, 0x38, 0x80, 0x08"
 694 #define ASM_VMX_INVVPID           ".byte 0x66, 0x0f, 0x38, 0x81, 0x08"
 695
 696 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 697
 698 #define TSS_IOPB_BASE_OFFSET 0x66
 699 #define TSS_BASE_SIZE 0x68
 700 #define TSS_IOPB_SIZE (65536 / 8)
 701 #define TSS_REDIRECTION_SIZE (256 / 8)
 702 #define RMODE_TSS_SIZE                                                  \
 703         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 704
 705 enum {
 706         TASK_SWITCH_CALL = 0,
 707         TASK_SWITCH_IRET = 1,
 708         TASK_SWITCH_JMP = 2,
 709         TASK_SWITCH_GATE = 3,
 710 };
 711
 712
 713 #ifdef CONFIG_64BIT
 714 # define KVM_EX_ENTRY ".quad"
 715 # define KVM_EX_PUSH "pushq"
 716 #else
 717 # define KVM_EX_ENTRY ".long"
 718 # define KVM_EX_PUSH "pushl"
 719 #endif
 720
 721 /*
 722  * Hardware virtualization extension instructions may fault if a
 723  * reboot turns off virtualization while processes are running.
 724  * Trap the fault and ignore the instruction if that happens.
 725  */
 726 asmlinkage void kvm_handle_fault_on_reboot(void);
 727
 728 #define __kvm_handle_fault_on_reboot(insn) \
 729         "666: " insn "\n\t" \
 730         ".pushsection .fixup, \"ax\" \n" \
 731         "667: \n\t" \
 732         KVM_EX_PUSH " $666b \n\t" \
 733         "jmp kvm_handle_fault_on_reboot \n\t" \
 734         ".popsection \n\t" \
 735         ".pushsection __ex_table, \"a\" \n\t" \
 736         KVM_EX_ENTRY " 666b, 667b \n\t" \
 737         ".popsection"
 738
 739 #define KVM_ARCH_WANT_MMU_NOTIFIER
 740 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 741 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 742
 743 #endif /* ASM_X86__KVM_HOST_H */