drivers/kvm/kvm.h

   1 #ifndef __KVM_H
   2 #define __KVM_H
   3
   4 /*
   5  * This work is licensed under the terms of the GNU GPL, version 2.  See
   6  * the COPYING file in the top-level directory.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/list.h>
  11 #include <linux/mutex.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/signal.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/preempt.h>
  17 #include <asm/signal.h>
  18
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_para.h>
  21
  22 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  23 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  24 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS|0xFFFFFF0000000000ULL)
  25
  26 #define KVM_GUEST_CR0_MASK \
  27         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  28          | X86_CR0_NW | X86_CR0_CD)
  29 #define KVM_VM_CR0_ALWAYS_ON \
  30         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  31          | X86_CR0_MP)
  32 #define KVM_GUEST_CR4_MASK \
  33         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  34 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  35 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  36
  37 #define INVALID_PAGE (~(hpa_t)0)
  38 #define UNMAPPED_GVA (~(gpa_t)0)
  39
  40 #define KVM_MAX_VCPUS 4
  41 #define KVM_ALIAS_SLOTS 4
  42 #define KVM_MEMORY_SLOTS 8
  43 #define KVM_NUM_MMU_PAGES 1024
  44 #define KVM_MIN_FREE_MMU_PAGES 5
  45 #define KVM_REFILL_PAGES 25
  46 #define KVM_MAX_CPUID_ENTRIES 40
  47
  48 #define DE_VECTOR 0
  49 #define NM_VECTOR 7
  50 #define DF_VECTOR 8
  51 #define TS_VECTOR 10
  52 #define NP_VECTOR 11
  53 #define SS_VECTOR 12
  54 #define GP_VECTOR 13
  55 #define PF_VECTOR 14
  56
  57 #define SELECTOR_TI_MASK (1 << 2)
  58 #define SELECTOR_RPL_MASK 0x03
  59
  60 #define IOPL_SHIFT 12
  61
  62 #define KVM_PIO_PAGE_OFFSET 1
  63
  64 /*
  65  * vcpu->requests bit members
  66  */
  67 #define KVM_TLB_FLUSH 0
  68
  69 /*
  70  * Address types:
  71  *
  72  *  gva - guest virtual address
  73  *  gpa - guest physical address
  74  *  gfn - guest frame number
  75  *  hva - host virtual address
  76  *  hpa - host physical address
  77  *  hfn - host frame number
  78  */
  79
  80 typedef unsigned long  gva_t;
  81 typedef u64            gpa_t;
  82 typedef unsigned long  gfn_t;
  83
  84 typedef unsigned long  hva_t;
  85 typedef u64            hpa_t;
  86 typedef unsigned long  hfn_t;
  87
  88 #define NR_PTE_CHAIN_ENTRIES 5
  89
  90 struct kvm_pte_chain {
  91         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
  92         struct hlist_node link;
  93 };
  94
  95 /*
  96  * kvm_mmu_page_role, below, is defined as:
  97  *
  98  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
  99  *   bits 4:7 - page table level for this shadow (1-4)
 100  *   bits 8:9 - page table quadrant for 2-level guests
 101  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 102  *   bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
 103  */
 104 union kvm_mmu_page_role {
 105         unsigned word;
 106         struct {
 107                 unsigned glevels : 4;
 108                 unsigned level : 4;
 109                 unsigned quadrant : 2;
 110                 unsigned pad_for_nice_hex_output : 6;
 111                 unsigned metaphysical : 1;
 112                 unsigned hugepage_access : 3;
 113         };
 114 };
 115
 116 struct kvm_mmu_page {
 117         struct list_head link;
 118         struct hlist_node hash_link;
 119
 120         /*
 121          * The following two entries are used to key the shadow page in the
 122          * hash table.
 123          */
 124         gfn_t gfn;
 125         union kvm_mmu_page_role role;
 126
 127         u64 *spt;
 128         unsigned long slot_bitmap; /* One bit set per slot which has memory
 129                                     * in this shadow page.
 130                                     */
 131         int multimapped;         /* More than one parent_pte? */
 132         int root_count;          /* Currently serving as active root */
 133         union {
 134                 u64 *parent_pte;               /* !multimapped */
 135                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 136         };
 137 };
 138
 139 struct kvm_vcpu;
 140 extern struct kmem_cache *kvm_vcpu_cache;
 141
 142 /*
 143  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 144  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 145  * mode.
 146  */
 147 struct kvm_mmu {
 148         void (*new_cr3)(struct kvm_vcpu *vcpu);
 149         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 150         void (*free)(struct kvm_vcpu *vcpu);
 151         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 152         hpa_t root_hpa;
 153         int root_level;
 154         int shadow_root_level;
 155
 156         u64 *pae_root;
 157 };
 158
 159 #define KVM_NR_MEM_OBJS 20
 160
 161 struct kvm_mmu_memory_cache {
 162         int nobjs;
 163         void *objects[KVM_NR_MEM_OBJS];
 164 };
 165
 166 /*
 167  * We don't want allocation failures within the mmu code, so we preallocate
 168  * enough memory for a single page fault in a cache.
 169  */
 170 struct kvm_guest_debug {
 171         int enabled;
 172         unsigned long bp[4];
 173         int singlestep;
 174 };
 175
 176 enum {
 177         VCPU_REGS_RAX = 0,
 178         VCPU_REGS_RCX = 1,
 179         VCPU_REGS_RDX = 2,
 180         VCPU_REGS_RBX = 3,
 181         VCPU_REGS_RSP = 4,
 182         VCPU_REGS_RBP = 5,
 183         VCPU_REGS_RSI = 6,
 184         VCPU_REGS_RDI = 7,
 185 #ifdef CONFIG_X86_64
 186         VCPU_REGS_R8 = 8,
 187         VCPU_REGS_R9 = 9,
 188         VCPU_REGS_R10 = 10,
 189         VCPU_REGS_R11 = 11,
 190         VCPU_REGS_R12 = 12,
 191         VCPU_REGS_R13 = 13,
 192         VCPU_REGS_R14 = 14,
 193         VCPU_REGS_R15 = 15,
 194 #endif
 195         NR_VCPU_REGS
 196 };
 197
 198 enum {
 199         VCPU_SREG_CS,
 200         VCPU_SREG_DS,
 201         VCPU_SREG_ES,
 202         VCPU_SREG_FS,
 203         VCPU_SREG_GS,
 204         VCPU_SREG_SS,
 205         VCPU_SREG_TR,
 206         VCPU_SREG_LDTR,
 207 };
 208
 209 struct kvm_pio_request {
 210         unsigned long count;
 211         int cur_count;
 212         struct page *guest_pages[2];
 213         unsigned guest_page_offset;
 214         int in;
 215         int port;
 216         int size;
 217         int string;
 218         int down;
 219         int rep;
 220 };
 221
 222 struct kvm_stat {
 223         u32 pf_fixed;
 224         u32 pf_guest;
 225         u32 tlb_flush;
 226         u32 invlpg;
 227
 228         u32 exits;
 229         u32 io_exits;
 230         u32 mmio_exits;
 231         u32 signal_exits;
 232         u32 irq_window_exits;
 233         u32 halt_exits;
 234         u32 halt_wakeup;
 235         u32 request_irq_exits;
 236         u32 irq_exits;
 237         u32 light_exits;
 238         u32 efer_reload;
 239 };
 240
 241 struct kvm_io_device {
 242         void (*read)(struct kvm_io_device *this,
 243                      gpa_t addr,
 244                      int len,
 245                      void *val);
 246         void (*write)(struct kvm_io_device *this,
 247                       gpa_t addr,
 248                       int len,
 249                       const void *val);
 250         int (*in_range)(struct kvm_io_device *this, gpa_t addr);
 251         void (*destructor)(struct kvm_io_device *this);
 252
 253         void             *private;
 254 };
 255
 256 static inline void kvm_iodevice_read(struct kvm_io_device *dev,
 257                                      gpa_t addr,
 258                                      int len,
 259                                      void *val)
 260 {
 261         dev->read(dev, addr, len, val);
 262 }
 263
 264 static inline void kvm_iodevice_write(struct kvm_io_device *dev,
 265                                       gpa_t addr,
 266                                       int len,
 267                                       const void *val)
 268 {
 269         dev->write(dev, addr, len, val);
 270 }
 271
 272 static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
 273 {
 274         return dev->in_range(dev, addr);
 275 }
 276
 277 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
 278 {
 279         if (dev->destructor)
 280                 dev->destructor(dev);
 281 }
 282
 283 /*
 284  * It would be nice to use something smarter than a linear search, TBD...
 285  * Thankfully we dont expect many devices to register (famous last words :),
 286  * so until then it will suffice.  At least its abstracted so we can change
 287  * in one place.
 288  */
 289 struct kvm_io_bus {
 290         int                   dev_count;
 291 #define NR_IOBUS_DEVS 6
 292         struct kvm_io_device *devs[NR_IOBUS_DEVS];
 293 };
 294
 295 void kvm_io_bus_init(struct kvm_io_bus *bus);
 296 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
 297 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
 298 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
 299                              struct kvm_io_device *dev);
 300
 301 struct kvm_vcpu {
 302         struct kvm *kvm;
 303         struct preempt_notifier preempt_notifier;
 304         int vcpu_id;
 305         struct mutex mutex;
 306         int   cpu;
 307         u64 host_tsc;
 308         struct kvm_run *run;
 309         int interrupt_window_open;
 310         int guest_mode;
 311         unsigned long requests;
 312         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 313         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 314         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 315         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 316
 317         unsigned long cr0;
 318         unsigned long cr2;
 319         unsigned long cr3;
 320         gpa_t para_state_gpa;
 321         struct page *para_state_page;
 322         gpa_t hypercall_gpa;
 323         unsigned long cr4;
 324         unsigned long cr8;
 325         u64 pdptrs[4]; /* pae */
 326         u64 shadow_efer;
 327         u64 apic_base;
 328         struct kvm_lapic *apic;    /* kernel irqchip context */
 329 #define VCPU_MP_STATE_RUNNABLE          0
 330 #define VCPU_MP_STATE_UNINITIALIZED     1
 331 #define VCPU_MP_STATE_INIT_RECEIVED     2
 332 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 333 #define VCPU_MP_STATE_HALTED            4
 334         int mp_state;
 335         int sipi_vector;
 336         u64 ia32_misc_enable_msr;
 337
 338         struct kvm_mmu mmu;
 339
 340         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 341         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 342         struct kvm_mmu_memory_cache mmu_page_cache;
 343         struct kvm_mmu_memory_cache mmu_page_header_cache;
 344
 345         gfn_t last_pt_write_gfn;
 346         int   last_pt_write_count;
 347
 348         struct kvm_guest_debug guest_debug;
 349
 350         struct i387_fxsave_struct host_fx_image;
 351         struct i387_fxsave_struct guest_fx_image;
 352         int fpu_active;
 353         int guest_fpu_loaded;
 354
 355         int mmio_needed;
 356         int mmio_read_completed;
 357         int mmio_is_write;
 358         int mmio_size;
 359         unsigned char mmio_data[8];
 360         gpa_t mmio_phys_addr;
 361         gva_t mmio_fault_cr2;
 362         struct kvm_pio_request pio;
 363         void *pio_data;
 364         wait_queue_head_t wq;
 365
 366         int sigset_active;
 367         sigset_t sigset;
 368
 369         struct kvm_stat stat;
 370
 371         struct {
 372                 int active;
 373                 u8 save_iopl;
 374                 struct kvm_save_segment {
 375                         u16 selector;
 376                         unsigned long base;
 377                         u32 limit;
 378                         u32 ar;
 379                 } tr, es, ds, fs, gs;
 380         } rmode;
 381         int halt_request; /* real mode on Intel only */
 382
 383         int cpuid_nent;
 384         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 385 };
 386
 387 struct kvm_mem_alias {
 388         gfn_t base_gfn;
 389         unsigned long npages;
 390         gfn_t target_gfn;
 391 };
 392
 393 struct kvm_memory_slot {
 394         gfn_t base_gfn;
 395         unsigned long npages;
 396         unsigned long flags;
 397         struct page **phys_mem;
 398         unsigned long *dirty_bitmap;
 399 };
 400
 401 struct kvm {
 402         struct mutex lock; /* protects everything except vcpus */
 403         int naliases;
 404         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 405         int nmemslots;
 406         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 407         /*
 408          * Hash table of struct kvm_mmu_page.
 409          */
 410         struct list_head active_mmu_pages;
 411         int n_free_mmu_pages;
 412         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 413         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 414         unsigned long rmap_overflow;
 415         struct list_head vm_list;
 416         struct file *filp;
 417         struct kvm_io_bus mmio_bus;
 418         struct kvm_io_bus pio_bus;
 419         struct kvm_pic *vpic;
 420         struct kvm_ioapic *vioapic;
 421         int round_robin_prev_vcpu;
 422 };
 423
 424 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
 425 {
 426         return kvm->vpic;
 427 }
 428
 429 static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 430 {
 431         return kvm->vioapic;
 432 }
 433
 434 static inline int irqchip_in_kernel(struct kvm *kvm)
 435 {
 436         return pic_irqchip(kvm) != 0;
 437 }
 438
 439 struct descriptor_table {
 440         u16 limit;
 441         unsigned long base;
 442 } __attribute__((packed));
 443
 444 struct kvm_x86_ops {
 445         int (*cpu_has_kvm_support)(void);          /* __init */
 446         int (*disabled_by_bios)(void);             /* __init */
 447         void (*hardware_enable)(void *dummy);      /* __init */
 448         void (*hardware_disable)(void *dummy);
 449         void (*check_processor_compatibility)(void *rtn);
 450         int (*hardware_setup)(void);               /* __init */
 451         void (*hardware_unsetup)(void);            /* __exit */
 452
 453         /* Create, but do not attach this VCPU */
 454         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 455         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 456         void (*vcpu_reset)(struct kvm_vcpu *vcpu);
 457
 458         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 459         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 460         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 461         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 462
 463         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 464                                struct kvm_debug_guest *dbg);
 465         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 466         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 467         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 468         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 469         void (*get_segment)(struct kvm_vcpu *vcpu,
 470                             struct kvm_segment *var, int seg);
 471         void (*set_segment)(struct kvm_vcpu *vcpu,
 472                             struct kvm_segment *var, int seg);
 473         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 474         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 475         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 476         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 477         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 478         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 479         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 480         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 481         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 482         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 483         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 484         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 485                        int *exception);
 486         void (*cache_regs)(struct kvm_vcpu *vcpu);
 487         void (*decache_regs)(struct kvm_vcpu *vcpu);
 488         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 489         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 490
 491         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 492         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 493                                   unsigned long addr, u32 err_code);
 494
 495         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 496
 497         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 498         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 499         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 500         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 501                                 unsigned char *hypercall_addr);
 502         int (*get_irq)(struct kvm_vcpu *vcpu);
 503         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 504         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 505         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 506                                        struct kvm_run *run);
 507 };
 508
 509 extern struct kvm_x86_ops *kvm_x86_ops;
 510
 511 /* The guest did something we don't support. */
 512 #define pr_unimpl(vcpu, fmt, ...)                                       \
 513  do {                                                                   \
 514         if (printk_ratelimit())                                         \
 515                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 516                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 517  } while(0)
 518
 519 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 520 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 521
 522 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 523 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 524
 525 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
 526                   struct module *module);
 527 void kvm_exit_x86(void);
 528
 529 int kvm_mmu_module_init(void);
 530 void kvm_mmu_module_exit(void);
 531
 532 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 533 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 534 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 535
 536 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 537 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 538 void kvm_mmu_zap_all(struct kvm *kvm);
 539
 540 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 541 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 542 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 543 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 544 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 545 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 546
 547 extern hpa_t bad_page_address;
 548
 549 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 550 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 551 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 552
 553 enum emulation_result {
 554         EMULATE_DONE,       /* no further processing */
 555         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 556         EMULATE_FAIL,         /* can't emulate this instruction */
 557 };
 558
 559 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 560                         unsigned long cr2, u16 error_code);
 561 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 562 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 563 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 564 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 565                    unsigned long *rflags);
 566
 567 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 568 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 569                      unsigned long *rflags);
 570 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 571 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 572
 573 struct x86_emulate_ctxt;
 574
 575 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 576                      int size, unsigned port);
 577 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 578                            int size, unsigned long count, int down,
 579                             gva_t address, int rep, unsigned port);
 580 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 581 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 582 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 583 int emulate_clts(struct kvm_vcpu *vcpu);
 584 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 585                     unsigned long *dest);
 586 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 587                     unsigned long value);
 588
 589 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 590 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 591 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 592 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 593 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 594 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 595 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 596
 597 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 598 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 599
 600 void fx_init(struct kvm_vcpu *vcpu);
 601
 602 void kvm_resched(struct kvm_vcpu *vcpu);
 603 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 604 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 605 void kvm_flush_remote_tlbs(struct kvm *kvm);
 606
 607 int emulator_read_std(unsigned long addr,
 608                       void *val,
 609                       unsigned int bytes,
 610                       struct kvm_vcpu *vcpu);
 611 int emulator_write_emulated(unsigned long addr,
 612                             const void *val,
 613                             unsigned int bytes,
 614                             struct kvm_vcpu *vcpu);
 615
 616 unsigned long segment_base(u16 selector);
 617
 618 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 619                        const u8 *new, int bytes);
 620 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 621 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 622 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 623 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 624
 625 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 626
 627 static inline void kvm_guest_enter(void)
 628 {
 629         current->flags |= PF_VCPU;
 630 }
 631
 632 static inline void kvm_guest_exit(void)
 633 {
 634         current->flags &= ~PF_VCPU;
 635 }
 636
 637 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 638                                      u32 error_code)
 639 {
 640         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 641 }
 642
 643 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
 644 {
 645         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 646                 __kvm_mmu_free_some_pages(vcpu);
 647 }
 648
 649 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 650 {
 651         if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
 652                 return 0;
 653
 654         return kvm_mmu_load(vcpu);
 655 }
 656
 657 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 658 {
 659 #ifdef CONFIG_X86_64
 660         return vcpu->shadow_efer & EFER_LME;
 661 #else
 662         return 0;
 663 #endif
 664 }
 665
 666 static inline int is_pae(struct kvm_vcpu *vcpu)
 667 {
 668         return vcpu->cr4 & X86_CR4_PAE;
 669 }
 670
 671 static inline int is_pse(struct kvm_vcpu *vcpu)
 672 {
 673         return vcpu->cr4 & X86_CR4_PSE;
 674 }
 675
 676 static inline int is_paging(struct kvm_vcpu *vcpu)
 677 {
 678         return vcpu->cr0 & X86_CR0_PG;
 679 }
 680
 681 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 682 {
 683         return slot - kvm->memslots;
 684 }
 685
 686 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 687 {
 688         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 689
 690         return (struct kvm_mmu_page *)page_private(page);
 691 }
 692
 693 static inline u16 read_fs(void)
 694 {
 695         u16 seg;
 696         asm ("mov %%fs, %0" : "=g"(seg));
 697         return seg;
 698 }
 699
 700 static inline u16 read_gs(void)
 701 {
 702         u16 seg;
 703         asm ("mov %%gs, %0" : "=g"(seg));
 704         return seg;
 705 }
 706
 707 static inline u16 read_ldt(void)
 708 {
 709         u16 ldt;
 710         asm ("sldt %0" : "=g"(ldt));
 711         return ldt;
 712 }
 713
 714 static inline void load_fs(u16 sel)
 715 {
 716         asm ("mov %0, %%fs" : : "rm"(sel));
 717 }
 718
 719 static inline void load_gs(u16 sel)
 720 {
 721         asm ("mov %0, %%gs" : : "rm"(sel));
 722 }
 723
 724 #ifndef load_ldt
 725 static inline void load_ldt(u16 sel)
 726 {
 727         asm ("lldt %0" : : "rm"(sel));
 728 }
 729 #endif
 730
 731 static inline void get_idt(struct descriptor_table *table)
 732 {
 733         asm ("sidt %0" : "=m"(*table));
 734 }
 735
 736 static inline void get_gdt(struct descriptor_table *table)
 737 {
 738         asm ("sgdt %0" : "=m"(*table));
 739 }
 740
 741 static inline unsigned long read_tr_base(void)
 742 {
 743         u16 tr;
 744         asm ("str %0" : "=g"(tr));
 745         return segment_base(tr);
 746 }
 747
 748 #ifdef CONFIG_X86_64
 749 static inline unsigned long read_msr(unsigned long msr)
 750 {
 751         u64 value;
 752
 753         rdmsrl(msr, value);
 754         return value;
 755 }
 756 #endif
 757
 758 static inline void fx_save(struct i387_fxsave_struct *image)
 759 {
 760         asm ("fxsave (%0)":: "r" (image));
 761 }
 762
 763 static inline void fx_restore(struct i387_fxsave_struct *image)
 764 {
 765         asm ("fxrstor (%0)":: "r" (image));
 766 }
 767
 768 static inline void fpu_init(void)
 769 {
 770         asm ("finit");
 771 }
 772
 773 static inline u32 get_rdx_init_val(void)
 774 {
 775         return 0x600; /* P6 family */
 776 }
 777
 778 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 779 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 780 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 781 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 782 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 783 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 784 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 785 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 786 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 787
 788 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 789
 790 #define TSS_IOPB_BASE_OFFSET 0x66
 791 #define TSS_BASE_SIZE 0x68
 792 #define TSS_IOPB_SIZE (65536 / 8)
 793 #define TSS_REDIRECTION_SIZE (256 / 8)
 794 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 795
 796 #endif