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 64
  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 INVALID_PAGE (~(hpa_t)0)
  42 #define UNMAPPED_GVA (~(gpa_t)0)
  43
  44 /* KVM Hugepage definitions for x86 */
  45 #define KVM_NR_PAGE_SIZES       3
  46 #define KVM_HPAGE_SHIFT(x)      (PAGE_SHIFT + (((x) - 1) * 9))
  47 #define KVM_HPAGE_SIZE(x)       (1UL << KVM_HPAGE_SHIFT(x))
  48 #define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
  49 #define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
  50
  51 #define DE_VECTOR 0
  52 #define DB_VECTOR 1
  53 #define BP_VECTOR 3
  54 #define OF_VECTOR 4
  55 #define BR_VECTOR 5
  56 #define UD_VECTOR 6
  57 #define NM_VECTOR 7
  58 #define DF_VECTOR 8
  59 #define TS_VECTOR 10
  60 #define NP_VECTOR 11
  61 #define SS_VECTOR 12
  62 #define GP_VECTOR 13
  63 #define PF_VECTOR 14
  64 #define MF_VECTOR 16
  65 #define MC_VECTOR 18
  66
  67 #define SELECTOR_TI_MASK (1 << 2)
  68 #define SELECTOR_RPL_MASK 0x03
  69
  70 #define IOPL_SHIFT 12
  71
  72 #define KVM_ALIAS_SLOTS 4
  73
  74 #define KVM_PERMILLE_MMU_PAGES 20
  75 #define KVM_MIN_ALLOC_MMU_PAGES 64
  76 #define KVM_MMU_HASH_SHIFT 10
  77 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
  78 #define KVM_MIN_FREE_MMU_PAGES 5
  79 #define KVM_REFILL_PAGES 25
  80 #define KVM_MAX_CPUID_ENTRIES 40
  81 #define KVM_NR_FIXED_MTRR_REGION 88
  82 #define KVM_NR_VAR_MTRR 8
  83
  84 extern spinlock_t kvm_lock;
  85 extern struct list_head vm_list;
  86
  87 struct kvm_vcpu;
  88 struct kvm;
  89
  90 enum kvm_reg {
  91         VCPU_REGS_RAX = 0,
  92         VCPU_REGS_RCX = 1,
  93         VCPU_REGS_RDX = 2,
  94         VCPU_REGS_RBX = 3,
  95         VCPU_REGS_RSP = 4,
  96         VCPU_REGS_RBP = 5,
  97         VCPU_REGS_RSI = 6,
  98         VCPU_REGS_RDI = 7,
  99 #ifdef CONFIG_X86_64
 100         VCPU_REGS_R8 = 8,
 101         VCPU_REGS_R9 = 9,
 102         VCPU_REGS_R10 = 10,
 103         VCPU_REGS_R11 = 11,
 104         VCPU_REGS_R12 = 12,
 105         VCPU_REGS_R13 = 13,
 106         VCPU_REGS_R14 = 14,
 107         VCPU_REGS_R15 = 15,
 108 #endif
 109         VCPU_REGS_RIP,
 110         NR_VCPU_REGS
 111 };
 112
 113 enum kvm_reg_ex {
 114         VCPU_EXREG_PDPTR = NR_VCPU_REGS,
 115 };
 116
 117 enum {
 118         VCPU_SREG_ES,
 119         VCPU_SREG_CS,
 120         VCPU_SREG_SS,
 121         VCPU_SREG_DS,
 122         VCPU_SREG_FS,
 123         VCPU_SREG_GS,
 124         VCPU_SREG_TR,
 125         VCPU_SREG_LDTR,
 126 };
 127
 128 #include <asm/kvm_emulate.h>
 129
 130 #define KVM_NR_MEM_OBJS 40
 131
 132 #define KVM_NR_DB_REGS  4
 133
 134 #define DR6_BD          (1 << 13)
 135 #define DR6_BS          (1 << 14)
 136 #define DR6_FIXED_1     0xffff0ff0
 137 #define DR6_VOLATILE    0x0000e00f
 138
 139 #define DR7_BP_EN_MASK  0x000000ff
 140 #define DR7_GE          (1 << 9)
 141 #define DR7_GD          (1 << 13)
 142 #define DR7_FIXED_1     0x00000400
 143 #define DR7_VOLATILE    0xffff23ff
 144
 145 /*
 146  * We don't want allocation failures within the mmu code, so we preallocate
 147  * enough memory for a single page fault in a cache.
 148  */
 149 struct kvm_mmu_memory_cache {
 150         int nobjs;
 151         void *objects[KVM_NR_MEM_OBJS];
 152 };
 153
 154 #define NR_PTE_CHAIN_ENTRIES 5
 155
 156 struct kvm_pte_chain {
 157         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 158         struct hlist_node link;
 159 };
 160
 161 /*
 162  * kvm_mmu_page_role, below, is defined as:
 163  *
 164  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 165  *   bits 4:7 - page table level for this shadow (1-4)
 166  *   bits 8:9 - page table quadrant for 2-level guests
 167  *   bit   16 - direct mapping of virtual to physical mapping at gfn
 168  *              used for real mode and two-dimensional paging
 169  *   bits 17:19 - common access permissions for all ptes in this shadow page
 170  */
 171 union kvm_mmu_page_role {
 172         unsigned word;
 173         struct {
 174                 unsigned level:4;
 175                 unsigned cr4_pae:1;
 176                 unsigned quadrant:2;
 177                 unsigned pad_for_nice_hex_output:6;
 178                 unsigned direct:1;
 179                 unsigned access:3;
 180                 unsigned invalid:1;
 181                 unsigned nxe:1;
 182                 unsigned cr0_wp:1;
 183         };
 184 };
 185
 186 struct kvm_mmu_page {
 187         struct list_head link;
 188         struct hlist_node hash_link;
 189
 190         /*
 191          * The following two entries are used to key the shadow page in the
 192          * hash table.
 193          */
 194         gfn_t gfn;
 195         union kvm_mmu_page_role role;
 196
 197         u64 *spt;
 198         /* hold the gfn of each spte inside spt */
 199         gfn_t *gfns;
 200         /*
 201          * One bit set per slot which has memory
 202          * in this shadow page.
 203          */
 204         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 205         bool multimapped;         /* More than one parent_pte? */
 206         bool unsync;
 207         int root_count;          /* Currently serving as active root */
 208         unsigned int unsync_children;
 209         union {
 210                 u64 *parent_pte;               /* !multimapped */
 211                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 212         };
 213         DECLARE_BITMAP(unsync_child_bitmap, 512);
 214 };
 215
 216 struct kvm_pv_mmu_op_buffer {
 217         void *ptr;
 218         unsigned len;
 219         unsigned processed;
 220         char buf[512] __aligned(sizeof(long));
 221 };
 222
 223 struct kvm_pio_request {
 224         unsigned long count;
 225         int in;
 226         int port;
 227         int size;
 228 };
 229
 230 /*
 231  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 232  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 233  * mode.
 234  */
 235 struct kvm_mmu {
 236         void (*new_cr3)(struct kvm_vcpu *vcpu);
 237         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 238         void (*free)(struct kvm_vcpu *vcpu);
 239         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
 240                             u32 *error);
 241         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 242                               struct kvm_mmu_page *page);
 243         int (*sync_page)(struct kvm_vcpu *vcpu,
 244                          struct kvm_mmu_page *sp);
 245         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 246         hpa_t root_hpa;
 247         int root_level;
 248         int shadow_root_level;
 249         union kvm_mmu_page_role base_role;
 250
 251         u64 *pae_root;
 252         u64 rsvd_bits_mask[2][4];
 253 };
 254
 255 struct kvm_vcpu_arch {
 256         u64 host_tsc;
 257         /*
 258          * rip and regs accesses must go through
 259          * kvm_{register,rip}_{read,write} functions.
 260          */
 261         unsigned long regs[NR_VCPU_REGS];
 262         u32 regs_avail;
 263         u32 regs_dirty;
 264
 265         unsigned long cr0;
 266         unsigned long cr0_guest_owned_bits;
 267         unsigned long cr2;
 268         unsigned long cr3;
 269         unsigned long cr4;
 270         unsigned long cr4_guest_owned_bits;
 271         unsigned long cr8;
 272         u32 hflags;
 273         u64 pdptrs[4]; /* pae */
 274         u64 efer;
 275         u64 apic_base;
 276         struct kvm_lapic *apic;    /* kernel irqchip context */
 277         int32_t apic_arb_prio;
 278         int mp_state;
 279         int sipi_vector;
 280         u64 ia32_misc_enable_msr;
 281         bool tpr_access_reporting;
 282
 283         struct kvm_mmu mmu;
 284         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 285          * put it here to avoid allocation */
 286         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 287
 288         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 289         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 290         struct kvm_mmu_memory_cache mmu_page_cache;
 291         struct kvm_mmu_memory_cache mmu_page_header_cache;
 292
 293         gfn_t last_pt_write_gfn;
 294         int   last_pt_write_count;
 295         u64  *last_pte_updated;
 296         gfn_t last_pte_gfn;
 297
 298         struct {
 299                 gfn_t gfn;      /* presumed gfn during guest pte update */
 300                 pfn_t pfn;      /* pfn corresponding to that gfn */
 301                 unsigned long mmu_seq;
 302         } update_pte;
 303
 304         struct i387_fxsave_struct host_fx_image;
 305         struct i387_fxsave_struct guest_fx_image;
 306
 307         gva_t mmio_fault_cr2;
 308         struct kvm_pio_request pio;
 309         void *pio_data;
 310
 311         u8 event_exit_inst_len;
 312
 313         struct kvm_queued_exception {
 314                 bool pending;
 315                 bool has_error_code;
 316                 bool reinject;
 317                 u8 nr;
 318                 u32 error_code;
 319         } exception;
 320
 321         struct kvm_queued_interrupt {
 322                 bool pending;
 323                 bool soft;
 324                 u8 nr;
 325         } interrupt;
 326
 327         int halt_request; /* real mode on Intel only */
 328
 329         int cpuid_nent;
 330         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 331         /* emulate context */
 332
 333         struct x86_emulate_ctxt emulate_ctxt;
 334
 335         gpa_t time;
 336         struct pvclock_vcpu_time_info hv_clock;
 337         unsigned int hv_clock_tsc_khz;
 338         unsigned int time_offset;
 339         struct page *time_page;
 340
 341         bool nmi_pending;
 342         bool nmi_injected;
 343
 344         struct mtrr_state_type mtrr_state;
 345         u32 pat;
 346
 347         int switch_db_regs;
 348         unsigned long db[KVM_NR_DB_REGS];
 349         unsigned long dr6;
 350         unsigned long dr7;
 351         unsigned long eff_db[KVM_NR_DB_REGS];
 352
 353         u64 mcg_cap;
 354         u64 mcg_status;
 355         u64 mcg_ctl;
 356         u64 *mce_banks;
 357
 358         /* used for guest single stepping over the given code position */
 359         unsigned long singlestep_rip;
 360
 361         /* fields used by HYPER-V emulation */
 362         u64 hv_vapic;
 363 };
 364
 365 struct kvm_mem_alias {
 366         gfn_t base_gfn;
 367         unsigned long npages;
 368         gfn_t target_gfn;
 369 #define KVM_ALIAS_INVALID     1UL
 370         unsigned long flags;
 371 };
 372
 373 #define KVM_ARCH_HAS_UNALIAS_INSTANTIATION
 374
 375 struct kvm_mem_aliases {
 376         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 377         int naliases;
 378 };
 379
 380 struct kvm_arch {
 381         struct kvm_mem_aliases *aliases;
 382
 383         unsigned int n_free_mmu_pages;
 384         unsigned int n_requested_mmu_pages;
 385         unsigned int n_alloc_mmu_pages;
 386         atomic_t invlpg_counter;
 387         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 388         /*
 389          * Hash table of struct kvm_mmu_page.
 390          */
 391         struct list_head active_mmu_pages;
 392         struct list_head assigned_dev_head;
 393         struct iommu_domain *iommu_domain;
 394         int iommu_flags;
 395         struct kvm_pic *vpic;
 396         struct kvm_ioapic *vioapic;
 397         struct kvm_pit *vpit;
 398         int vapics_in_nmi_mode;
 399
 400         unsigned int tss_addr;
 401         struct page *apic_access_page;
 402
 403         gpa_t wall_clock;
 404
 405         struct page *ept_identity_pagetable;
 406         bool ept_identity_pagetable_done;
 407         gpa_t ept_identity_map_addr;
 408
 409         unsigned long irq_sources_bitmap;
 410         u64 vm_init_tsc;
 411         s64 kvmclock_offset;
 412
 413         struct kvm_xen_hvm_config xen_hvm_config;
 414
 415         /* fields used by HYPER-V emulation */
 416         u64 hv_guest_os_id;
 417         u64 hv_hypercall;
 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 kvm_x86_ops {
 460         int (*cpu_has_kvm_support)(void);          /* __init */
 461         int (*disabled_by_bios)(void);             /* __init */
 462         int (*hardware_enable)(void *dummy);
 463         void (*hardware_disable)(void *dummy);
 464         void (*check_processor_compatibility)(void *rtn);
 465         int (*hardware_setup)(void);               /* __init */
 466         void (*hardware_unsetup)(void);            /* __exit */
 467         bool (*cpu_has_accelerated_tpr)(void);
 468         void (*cpuid_update)(struct kvm_vcpu *vcpu);
 469
 470         /* Create, but do not attach this VCPU */
 471         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 472         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 473         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 474
 475         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 476         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 477         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 478
 479         void (*set_guest_debug)(struct kvm_vcpu *vcpu,
 480                                 struct kvm_guest_debug *dbg);
 481         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 482         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 483         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 484         void (*get_segment)(struct kvm_vcpu *vcpu,
 485                             struct kvm_segment *var, int seg);
 486         int (*get_cpl)(struct kvm_vcpu *vcpu);
 487         void (*set_segment)(struct kvm_vcpu *vcpu,
 488                             struct kvm_segment *var, int seg);
 489         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 490         void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
 491         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 492         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 493         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 494         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 495         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 496         void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 497         void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 498         void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 499         void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 500         void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
 501         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 502         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 503         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 504         void (*fpu_activate)(struct kvm_vcpu *vcpu);
 505         void (*fpu_deactivate)(struct kvm_vcpu *vcpu);
 506
 507         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 508
 509         void (*run)(struct kvm_vcpu *vcpu);
 510         int (*handle_exit)(struct kvm_vcpu *vcpu);
 511         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 512         void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 513         u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 514         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 515                                 unsigned char *hypercall_addr);
 516         void (*set_irq)(struct kvm_vcpu *vcpu);
 517         void (*set_nmi)(struct kvm_vcpu *vcpu);
 518         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 519                                 bool has_error_code, u32 error_code,
 520                                 bool reinject);
 521         int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 522         int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 523         bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
 524         void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
 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         int (*get_lpage_level)(void);
 532         bool (*rdtscp_supported)(void);
 533
 534         void (*set_supported_cpuid)(u32 func, struct kvm_cpuid_entry2 *entry);
 535
 536         const struct trace_print_flags *exit_reasons_str;
 537 };
 538
 539 extern struct kvm_x86_ops *kvm_x86_ops;
 540
 541 int kvm_mmu_module_init(void);
 542 void kvm_mmu_module_exit(void);
 543
 544 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 545 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 546 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 547 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 548 void kvm_mmu_set_base_ptes(u64 base_pte);
 549 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 550                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 551
 552 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 553 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 554 void kvm_mmu_zap_all(struct kvm *kvm);
 555 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 556 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 557
 558 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 559
 560 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 561                           const void *val, int bytes);
 562 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 563                   gpa_t addr, unsigned long *ret);
 564 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 565
 566 extern bool tdp_enabled;
 567
 568 enum emulation_result {
 569         EMULATE_DONE,       /* no further processing */
 570         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 571         EMULATE_FAIL,         /* can't emulate this instruction */
 572 };
 573
 574 #define EMULTYPE_NO_DECODE          (1 << 0)
 575 #define EMULTYPE_TRAP_UD            (1 << 1)
 576 #define EMULTYPE_SKIP               (1 << 2)
 577 int emulate_instruction(struct kvm_vcpu *vcpu,
 578                         unsigned long cr2, u16 error_code, int emulation_type);
 579 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 580 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 581 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 582
 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_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);
 590 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 591 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 592 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 593 int emulate_clts(struct kvm_vcpu *vcpu);
 594 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 595                     unsigned long *dest);
 596 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 597                     unsigned long value);
 598
 599 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 600 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
 601
 602 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
 603                     bool has_error_code, u32 error_code);
 604
 605 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 606 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 607 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 608 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 609 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val);
 610 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val);
 611 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 612 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 613 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 614
 615 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 616 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 617
 618 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
 619 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 620
 621 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 622 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 623 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 624 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 625 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 626                            u32 error_code);
 627 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
 628
 629 int kvm_pic_set_irq(void *opaque, int irq, int level);
 630
 631 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 632
 633 void fx_init(struct kvm_vcpu *vcpu);
 634
 635 int emulator_write_emulated(unsigned long addr,
 636                             const void *val,
 637                             unsigned int bytes,
 638                             struct kvm_vcpu *vcpu);
 639
 640 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 641 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 642                        const u8 *new, int bytes,
 643                        bool guest_initiated);
 644 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 645 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 646 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 647 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 648 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 649 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 650 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 651 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 652 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 653
 654 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 655
 656 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 657
 658 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 659 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 660
 661 void kvm_enable_tdp(void);
 662 void kvm_disable_tdp(void);
 663
 664 int complete_pio(struct kvm_vcpu *vcpu);
 665 bool kvm_check_iopl(struct kvm_vcpu *vcpu);
 666
 667 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 668
 669 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 670 {
 671         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 672
 673         return (struct kvm_mmu_page *)page_private(page);
 674 }
 675
 676 static inline u16 kvm_read_fs(void)
 677 {
 678         u16 seg;
 679         asm("mov %%fs, %0" : "=g"(seg));
 680         return seg;
 681 }
 682
 683 static inline u16 kvm_read_gs(void)
 684 {
 685         u16 seg;
 686         asm("mov %%gs, %0" : "=g"(seg));
 687         return seg;
 688 }
 689
 690 static inline u16 kvm_read_ldt(void)
 691 {
 692         u16 ldt;
 693         asm("sldt %0" : "=g"(ldt));
 694         return ldt;
 695 }
 696
 697 static inline void kvm_load_fs(u16 sel)
 698 {
 699         asm("mov %0, %%fs" : : "rm"(sel));
 700 }
 701
 702 static inline void kvm_load_gs(u16 sel)
 703 {
 704         asm("mov %0, %%gs" : : "rm"(sel));
 705 }
 706
 707 static inline void kvm_load_ldt(u16 sel)
 708 {
 709         asm("lldt %0" : : "rm"(sel));
 710 }
 711
 712 #ifdef CONFIG_X86_64
 713 static inline unsigned long read_msr(unsigned long msr)
 714 {
 715         u64 value;
 716
 717         rdmsrl(msr, value);
 718         return value;
 719 }
 720 #endif
 721
 722 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 723 {
 724         asm("fxsave (%0)":: "r" (image));
 725 }
 726
 727 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 728 {
 729         asm("fxrstor (%0)":: "r" (image));
 730 }
 731
 732 static inline void kvm_fx_finit(void)
 733 {
 734         asm("finit");
 735 }
 736
 737 static inline u32 get_rdx_init_val(void)
 738 {
 739         return 0x600; /* P6 family */
 740 }
 741
 742 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 743 {
 744         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 745 }
 746
 747 #define TSS_IOPB_BASE_OFFSET 0x66
 748 #define TSS_BASE_SIZE 0x68
 749 #define TSS_IOPB_SIZE (65536 / 8)
 750 #define TSS_REDIRECTION_SIZE (256 / 8)
 751 #define RMODE_TSS_SIZE                                                  \
 752         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 753
 754 enum {
 755         TASK_SWITCH_CALL = 0,
 756         TASK_SWITCH_IRET = 1,
 757         TASK_SWITCH_JMP = 2,
 758         TASK_SWITCH_GATE = 3,
 759 };
 760
 761 #define HF_GIF_MASK             (1 << 0)
 762 #define HF_HIF_MASK             (1 << 1)
 763 #define HF_VINTR_MASK           (1 << 2)
 764 #define HF_NMI_MASK             (1 << 3)
 765 #define HF_IRET_MASK            (1 << 4)
 766
 767 /*
 768  * Hardware virtualization extension instructions may fault if a
 769  * reboot turns off virtualization while processes are running.
 770  * Trap the fault and ignore the instruction if that happens.
 771  */
 772 asmlinkage void kvm_handle_fault_on_reboot(void);
 773
 774 #define __kvm_handle_fault_on_reboot(insn) \
 775         "666: " insn "\n\t" \
 776         ".pushsection .fixup, \"ax\" \n" \
 777         "667: \n\t" \
 778         __ASM_SIZE(push) " $666b \n\t"        \
 779         "jmp kvm_handle_fault_on_reboot \n\t" \
 780         ".popsection \n\t" \
 781         ".pushsection __ex_table, \"a\" \n\t" \
 782         _ASM_PTR " 666b, 667b \n\t" \
 783         ".popsection"
 784
 785 #define KVM_ARCH_WANT_MMU_NOTIFIER
 786 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 787 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 788 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 789 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 790 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 791 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 792 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 793
 794 void kvm_define_shared_msr(unsigned index, u32 msr);
 795 void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
 796
 797 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);
 798
 799 #endif /* _ASM_X86_KVM_HOST_H */