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 glevels:4;
 175                 unsigned level:4;
 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 cr4_pge:1;
 182                 unsigned nxe:1;
 183         };
 184 };
 185
 186 struct kvm_mmu_page {
 187         struct list_head link;
 188         struct hlist_node hash_link;
 189
 190         struct list_head oos_link;
 191
 192         /*
 193          * The following two entries are used to key the shadow page in the
 194          * hash table.
 195          */
 196         gfn_t gfn;
 197         union kvm_mmu_page_role role;
 198
 199         u64 *spt;
 200         /* hold the gfn of each spte inside spt */
 201         gfn_t *gfns;
 202         /*
 203          * One bit set per slot which has memory
 204          * in this shadow page.
 205          */
 206         DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
 207         int multimapped;         /* More than one parent_pte? */
 208         int root_count;          /* Currently serving as active root */
 209         bool unsync;
 210         unsigned int unsync_children;
 211         union {
 212                 u64 *parent_pte;               /* !multimapped */
 213                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 214         };
 215         DECLARE_BITMAP(unsync_child_bitmap, 512);
 216 };
 217
 218 struct kvm_pv_mmu_op_buffer {
 219         void *ptr;
 220         unsigned len;
 221         unsigned processed;
 222         char buf[512] __aligned(sizeof(long));
 223 };
 224
 225 struct kvm_pio_request {
 226         unsigned long count;
 227         int cur_count;
 228         gva_t guest_gva;
 229         int in;
 230         int port;
 231         int size;
 232         int string;
 233         int down;
 234         int rep;
 235 };
 236
 237 /*
 238  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 239  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 240  * mode.
 241  */
 242 struct kvm_mmu {
 243         void (*new_cr3)(struct kvm_vcpu *vcpu);
 244         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 245         void (*free)(struct kvm_vcpu *vcpu);
 246         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
 247                             u32 *error);
 248         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 249                               struct kvm_mmu_page *page);
 250         int (*sync_page)(struct kvm_vcpu *vcpu,
 251                          struct kvm_mmu_page *sp);
 252         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
 253         hpa_t root_hpa;
 254         int root_level;
 255         int shadow_root_level;
 256         union kvm_mmu_page_role base_role;
 257
 258         u64 *pae_root;
 259         u64 rsvd_bits_mask[2][4];
 260 };
 261
 262 struct kvm_vcpu_arch {
 263         u64 host_tsc;
 264         /*
 265          * rip and regs accesses must go through
 266          * kvm_{register,rip}_{read,write} functions.
 267          */
 268         unsigned long regs[NR_VCPU_REGS];
 269         u32 regs_avail;
 270         u32 regs_dirty;
 271
 272         unsigned long cr0;
 273         unsigned long cr0_guest_owned_bits;
 274         unsigned long cr2;
 275         unsigned long cr3;
 276         unsigned long cr4;
 277         unsigned long cr4_guest_owned_bits;
 278         unsigned long cr8;
 279         u32 hflags;
 280         u64 pdptrs[4]; /* pae */
 281         u64 efer;
 282         u64 apic_base;
 283         struct kvm_lapic *apic;    /* kernel irqchip context */
 284         int32_t apic_arb_prio;
 285         int mp_state;
 286         int sipi_vector;
 287         u64 ia32_misc_enable_msr;
 288         bool tpr_access_reporting;
 289
 290         struct kvm_mmu mmu;
 291         /* only needed in kvm_pv_mmu_op() path, but it's hot so
 292          * put it here to avoid allocation */
 293         struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 294
 295         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 296         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 297         struct kvm_mmu_memory_cache mmu_page_cache;
 298         struct kvm_mmu_memory_cache mmu_page_header_cache;
 299
 300         gfn_t last_pt_write_gfn;
 301         int   last_pt_write_count;
 302         u64  *last_pte_updated;
 303         gfn_t last_pte_gfn;
 304
 305         struct {
 306                 gfn_t gfn;      /* presumed gfn during guest pte update */
 307                 pfn_t pfn;      /* pfn corresponding to that gfn */
 308                 unsigned long mmu_seq;
 309         } update_pte;
 310
 311         struct i387_fxsave_struct host_fx_image;
 312         struct i387_fxsave_struct guest_fx_image;
 313
 314         gva_t mmio_fault_cr2;
 315         struct kvm_pio_request pio;
 316         void *pio_data;
 317
 318         u8 event_exit_inst_len;
 319
 320         struct kvm_queued_exception {
 321                 bool pending;
 322                 bool has_error_code;
 323                 u8 nr;
 324                 u32 error_code;
 325         } exception;
 326
 327         struct kvm_queued_interrupt {
 328                 bool pending;
 329                 bool soft;
 330                 u8 nr;
 331         } interrupt;
 332
 333         int halt_request; /* real mode on Intel only */
 334
 335         int cpuid_nent;
 336         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 337         /* emulate context */
 338
 339         struct x86_emulate_ctxt emulate_ctxt;
 340
 341         gpa_t time;
 342         struct pvclock_vcpu_time_info hv_clock;
 343         unsigned int hv_clock_tsc_khz;
 344         unsigned int time_offset;
 345         struct page *time_page;
 346
 347         bool nmi_pending;
 348         bool nmi_injected;
 349
 350         struct mtrr_state_type mtrr_state;
 351         u32 pat;
 352
 353         int switch_db_regs;
 354         unsigned long db[KVM_NR_DB_REGS];
 355         unsigned long dr6;
 356         unsigned long dr7;
 357         unsigned long eff_db[KVM_NR_DB_REGS];
 358
 359         u64 mcg_cap;
 360         u64 mcg_status;
 361         u64 mcg_ctl;
 362         u64 *mce_banks;
 363
 364         /* used for guest single stepping over the given code position */
 365         unsigned long singlestep_rip;
 366
 367         /* fields used by HYPER-V emulation */
 368         u64 hv_vapic;
 369 };
 370
 371 struct kvm_mem_alias {
 372         gfn_t base_gfn;
 373         unsigned long npages;
 374         gfn_t target_gfn;
 375 #define KVM_ALIAS_INVALID     1UL
 376         unsigned long flags;
 377 };
 378
 379 #define KVM_ARCH_HAS_UNALIAS_INSTANTIATION
 380
 381 struct kvm_mem_aliases {
 382         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 383         int naliases;
 384 };
 385
 386 struct kvm_arch {
 387         struct kvm_mem_aliases *aliases;
 388
 389         unsigned int n_free_mmu_pages;
 390         unsigned int n_requested_mmu_pages;
 391         unsigned int n_alloc_mmu_pages;
 392         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 393         /*
 394          * Hash table of struct kvm_mmu_page.
 395          */
 396         struct list_head active_mmu_pages;
 397         struct list_head assigned_dev_head;
 398         struct iommu_domain *iommu_domain;
 399         int iommu_flags;
 400         struct kvm_pic *vpic;
 401         struct kvm_ioapic *vioapic;
 402         struct kvm_pit *vpit;
 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         gpa_t ept_identity_map_addr;
 413
 414         unsigned long irq_sources_bitmap;
 415         u64 vm_init_tsc;
 416         s64 kvmclock_offset;
 417
 418         struct kvm_xen_hvm_config xen_hvm_config;
 419
 420         /* fields used by HYPER-V emulation */
 421         u64 hv_guest_os_id;
 422         u64 hv_hypercall;
 423 };
 424
 425 struct kvm_vm_stat {
 426         u32 mmu_shadow_zapped;
 427         u32 mmu_pte_write;
 428         u32 mmu_pte_updated;
 429         u32 mmu_pde_zapped;
 430         u32 mmu_flooded;
 431         u32 mmu_recycled;
 432         u32 mmu_cache_miss;
 433         u32 mmu_unsync;
 434         u32 remote_tlb_flush;
 435         u32 lpages;
 436 };
 437
 438 struct kvm_vcpu_stat {
 439         u32 pf_fixed;
 440         u32 pf_guest;
 441         u32 tlb_flush;
 442         u32 invlpg;
 443
 444         u32 exits;
 445         u32 io_exits;
 446         u32 mmio_exits;
 447         u32 signal_exits;
 448         u32 irq_window_exits;
 449         u32 nmi_window_exits;
 450         u32 halt_exits;
 451         u32 halt_wakeup;
 452         u32 request_irq_exits;
 453         u32 irq_exits;
 454         u32 host_state_reload;
 455         u32 efer_reload;
 456         u32 fpu_reload;
 457         u32 insn_emulation;
 458         u32 insn_emulation_fail;
 459         u32 hypercalls;
 460         u32 irq_injections;
 461         u32 nmi_injections;
 462 };
 463
 464 struct kvm_x86_ops {
 465         int (*cpu_has_kvm_support)(void);          /* __init */
 466         int (*disabled_by_bios)(void);             /* __init */
 467         int (*hardware_enable)(void *dummy);
 468         void (*hardware_disable)(void *dummy);
 469         void (*check_processor_compatibility)(void *rtn);
 470         int (*hardware_setup)(void);               /* __init */
 471         void (*hardware_unsetup)(void);            /* __exit */
 472         bool (*cpu_has_accelerated_tpr)(void);
 473         void (*cpuid_update)(struct kvm_vcpu *vcpu);
 474
 475         /* Create, but do not attach this VCPU */
 476         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 477         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 478         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 479
 480         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 481         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 482         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 483
 484         void (*set_guest_debug)(struct kvm_vcpu *vcpu,
 485                                 struct kvm_guest_debug *dbg);
 486         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 487         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 488         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 489         void (*get_segment)(struct kvm_vcpu *vcpu,
 490                             struct kvm_segment *var, int seg);
 491         int (*get_cpl)(struct kvm_vcpu *vcpu);
 492         void (*set_segment)(struct kvm_vcpu *vcpu,
 493                             struct kvm_segment *var, int seg);
 494         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 495         void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
 496         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 497         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 498         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 499         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 500         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 501         void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 502         void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 503         void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 504         void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 505         int (*get_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long *dest);
 506         int (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value);
 507         void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
 508         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 509         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 510         void (*fpu_activate)(struct kvm_vcpu *vcpu);
 511         void (*fpu_deactivate)(struct kvm_vcpu *vcpu);
 512
 513         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 514
 515         void (*run)(struct kvm_vcpu *vcpu);
 516         int (*handle_exit)(struct kvm_vcpu *vcpu);
 517         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 518         void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 519         u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
 520         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 521                                 unsigned char *hypercall_addr);
 522         void (*set_irq)(struct kvm_vcpu *vcpu);
 523         void (*set_nmi)(struct kvm_vcpu *vcpu);
 524         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 525                                 bool has_error_code, u32 error_code);
 526         int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
 527         int (*nmi_allowed)(struct kvm_vcpu *vcpu);
 528         bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
 529         void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
 530         void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 531         void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 532         void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
 533         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 534         int (*get_tdp_level)(void);
 535         u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 536         int (*get_lpage_level)(void);
 537         bool (*rdtscp_supported)(void);
 538
 539         const struct trace_print_flags *exit_reasons_str;
 540 };
 541
 542 extern struct kvm_x86_ops *kvm_x86_ops;
 543
 544 int kvm_mmu_module_init(void);
 545 void kvm_mmu_module_exit(void);
 546
 547 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 548 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 549 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 550 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 551 void kvm_mmu_set_base_ptes(u64 base_pte);
 552 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 553                 u64 dirty_mask, u64 nx_mask, u64 x_mask);
 554
 555 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 556 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 557 void kvm_mmu_zap_all(struct kvm *kvm);
 558 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 559 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 560
 561 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 562
 563 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 564                           const void *val, int bytes);
 565 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 566                   gpa_t addr, unsigned long *ret);
 567 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
 568
 569 extern bool tdp_enabled;
 570
 571 enum emulation_result {
 572         EMULATE_DONE,       /* no further processing */
 573         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 574         EMULATE_FAIL,         /* can't emulate this instruction */
 575 };
 576
 577 #define EMULTYPE_NO_DECODE          (1 << 0)
 578 #define EMULTYPE_TRAP_UD            (1 << 1)
 579 #define EMULTYPE_SKIP               (1 << 2)
 580 int emulate_instruction(struct kvm_vcpu *vcpu,
 581                         unsigned long cr2, u16 error_code, int emulation_type);
 582 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 583 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 584 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 585 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 586                    unsigned long *rflags);
 587
 588 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 589 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 590                      unsigned long *rflags);
 591 void kvm_enable_efer_bits(u64);
 592 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 593 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 594
 595 struct x86_emulate_ctxt;
 596
 597 int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in,
 598                      int size, unsigned port);
 599 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in,
 600                            int size, unsigned long count, int down,
 601                             gva_t address, int rep, unsigned port);
 602 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 603 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 604 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 605 int emulate_clts(struct kvm_vcpu *vcpu);
 606 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 607                     unsigned long *dest);
 608 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 609                     unsigned long value);
 610
 611 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 612 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
 613
 614 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
 615
 616 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 617 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
 618 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
 619 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
 620 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
 621 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 622 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 623
 624 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 625 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 626
 627 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
 628 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 629
 630 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 631 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 632 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 633                            u32 error_code);
 634 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
 635
 636 int kvm_pic_set_irq(void *opaque, int irq, int level);
 637
 638 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
 639
 640 void fx_init(struct kvm_vcpu *vcpu);
 641
 642 int emulator_write_emulated(unsigned long addr,
 643                             const void *val,
 644                             unsigned int bytes,
 645                             struct kvm_vcpu *vcpu);
 646
 647 unsigned long segment_base(u16 selector);
 648
 649 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 650 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 651                        const u8 *new, int bytes,
 652                        bool guest_initiated);
 653 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 654 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 655 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 656 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 657 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 658 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 659 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 660 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 661 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
 662
 663 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 664
 665 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 666
 667 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 668 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
 669
 670 void kvm_enable_tdp(void);
 671 void kvm_disable_tdp(void);
 672
 673 int complete_pio(struct kvm_vcpu *vcpu);
 674 bool kvm_check_iopl(struct kvm_vcpu *vcpu);
 675
 676 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
 677
 678 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 679 {
 680         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 681
 682         return (struct kvm_mmu_page *)page_private(page);
 683 }
 684
 685 static inline u16 kvm_read_fs(void)
 686 {
 687         u16 seg;
 688         asm("mov %%fs, %0" : "=g"(seg));
 689         return seg;
 690 }
 691
 692 static inline u16 kvm_read_gs(void)
 693 {
 694         u16 seg;
 695         asm("mov %%gs, %0" : "=g"(seg));
 696         return seg;
 697 }
 698
 699 static inline u16 kvm_read_ldt(void)
 700 {
 701         u16 ldt;
 702         asm("sldt %0" : "=g"(ldt));
 703         return ldt;
 704 }
 705
 706 static inline void kvm_load_fs(u16 sel)
 707 {
 708         asm("mov %0, %%fs" : : "rm"(sel));
 709 }
 710
 711 static inline void kvm_load_gs(u16 sel)
 712 {
 713         asm("mov %0, %%gs" : : "rm"(sel));
 714 }
 715
 716 static inline void kvm_load_ldt(u16 sel)
 717 {
 718         asm("lldt %0" : : "rm"(sel));
 719 }
 720
 721 static inline void kvm_get_idt(struct desc_ptr *table)
 722 {
 723         asm("sidt %0" : "=m"(*table));
 724 }
 725
 726 static inline void kvm_get_gdt(struct desc_ptr *table)
 727 {
 728         asm("sgdt %0" : "=m"(*table));
 729 }
 730
 731 static inline unsigned long kvm_read_tr_base(void)
 732 {
 733         u16 tr;
 734         asm("str %0" : "=g"(tr));
 735         return segment_base(tr);
 736 }
 737
 738 #ifdef CONFIG_X86_64
 739 static inline unsigned long read_msr(unsigned long msr)
 740 {
 741         u64 value;
 742
 743         rdmsrl(msr, value);
 744         return value;
 745 }
 746 #endif
 747
 748 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
 749 {
 750         asm("fxsave (%0)":: "r" (image));
 751 }
 752
 753 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
 754 {
 755         asm("fxrstor (%0)":: "r" (image));
 756 }
 757
 758 static inline void kvm_fx_finit(void)
 759 {
 760         asm("finit");
 761 }
 762
 763 static inline u32 get_rdx_init_val(void)
 764 {
 765         return 0x600; /* P6 family */
 766 }
 767
 768 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 769 {
 770         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 771 }
 772
 773 #define TSS_IOPB_BASE_OFFSET 0x66
 774 #define TSS_BASE_SIZE 0x68
 775 #define TSS_IOPB_SIZE (65536 / 8)
 776 #define TSS_REDIRECTION_SIZE (256 / 8)
 777 #define RMODE_TSS_SIZE                                                  \
 778         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 779
 780 enum {
 781         TASK_SWITCH_CALL = 0,
 782         TASK_SWITCH_IRET = 1,
 783         TASK_SWITCH_JMP = 2,
 784         TASK_SWITCH_GATE = 3,
 785 };
 786
 787 #define HF_GIF_MASK             (1 << 0)
 788 #define HF_HIF_MASK             (1 << 1)
 789 #define HF_VINTR_MASK           (1 << 2)
 790 #define HF_NMI_MASK             (1 << 3)
 791 #define HF_IRET_MASK            (1 << 4)
 792
 793 /*
 794  * Hardware virtualization extension instructions may fault if a
 795  * reboot turns off virtualization while processes are running.
 796  * Trap the fault and ignore the instruction if that happens.
 797  */
 798 asmlinkage void kvm_handle_fault_on_reboot(void);
 799
 800 #define __kvm_handle_fault_on_reboot(insn) \
 801         "666: " insn "\n\t" \
 802         ".pushsection .fixup, \"ax\" \n" \
 803         "667: \n\t" \
 804         __ASM_SIZE(push) " $666b \n\t"        \
 805         "jmp kvm_handle_fault_on_reboot \n\t" \
 806         ".popsection \n\t" \
 807         ".pushsection __ex_table, \"a\" \n\t" \
 808         _ASM_PTR " 666b, 667b \n\t" \
 809         ".popsection"
 810
 811 #define KVM_ARCH_WANT_MMU_NOTIFIER
 812 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 813 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 814 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 815 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
 816 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 817 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 818 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 819
 820 void kvm_define_shared_msr(unsigned index, u32 msr);
 821 void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
 822
 823 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);
 824
 825 #endif /* _ASM_X86_KVM_HOST_H */