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_PERMILLE_MMU_PAGES 20
  44 #define KVM_MIN_ALLOC_MMU_PAGES 64
  45 #define KVM_NUM_MMU_PAGES 1024
  46 #define KVM_MIN_FREE_MMU_PAGES 5
  47 #define KVM_REFILL_PAGES 25
  48 #define KVM_MAX_CPUID_ENTRIES 40
  49
  50 #define DE_VECTOR 0
  51 #define UD_VECTOR 6
  52 #define NM_VECTOR 7
  53 #define DF_VECTOR 8
  54 #define TS_VECTOR 10
  55 #define NP_VECTOR 11
  56 #define SS_VECTOR 12
  57 #define GP_VECTOR 13
  58 #define PF_VECTOR 14
  59
  60 #define SELECTOR_TI_MASK (1 << 2)
  61 #define SELECTOR_RPL_MASK 0x03
  62
  63 #define IOPL_SHIFT 12
  64
  65 #define KVM_PIO_PAGE_OFFSET 1
  66
  67 /*
  68  * vcpu->requests bit members
  69  */
  70 #define KVM_TLB_FLUSH 0
  71
  72 /*
  73  * Address types:
  74  *
  75  *  gva - guest virtual address
  76  *  gpa - guest physical address
  77  *  gfn - guest frame number
  78  *  hva - host virtual address
  79  *  hpa - host physical address
  80  *  hfn - host frame number
  81  */
  82
  83 typedef unsigned long  gva_t;
  84 typedef u64            gpa_t;
  85 typedef unsigned long  gfn_t;
  86
  87 typedef unsigned long  hva_t;
  88 typedef u64            hpa_t;
  89 typedef unsigned long  hfn_t;
  90
  91 #define NR_PTE_CHAIN_ENTRIES 5
  92
  93 struct kvm_pte_chain {
  94         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
  95         struct hlist_node link;
  96 };
  97
  98 /*
  99  * kvm_mmu_page_role, below, is defined as:
 100  *
 101  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 102  *   bits 4:7 - page table level for this shadow (1-4)
 103  *   bits 8:9 - page table quadrant for 2-level guests
 104  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 105  *   bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
 106  */
 107 union kvm_mmu_page_role {
 108         unsigned word;
 109         struct {
 110                 unsigned glevels : 4;
 111                 unsigned level : 4;
 112                 unsigned quadrant : 2;
 113                 unsigned pad_for_nice_hex_output : 6;
 114                 unsigned metaphysical : 1;
 115                 unsigned hugepage_access : 3;
 116         };
 117 };
 118
 119 struct kvm_mmu_page {
 120         struct list_head link;
 121         struct hlist_node hash_link;
 122
 123         /*
 124          * The following two entries are used to key the shadow page in the
 125          * hash table.
 126          */
 127         gfn_t gfn;
 128         union kvm_mmu_page_role role;
 129
 130         u64 *spt;
 131         /* hold the gfn of each spte inside spt */
 132         gfn_t *gfns;
 133         unsigned long slot_bitmap; /* One bit set per slot which has memory
 134                                     * in this shadow page.
 135                                     */
 136         int multimapped;         /* More than one parent_pte? */
 137         int root_count;          /* Currently serving as active root */
 138         union {
 139                 u64 *parent_pte;               /* !multimapped */
 140                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 141         };
 142 };
 143
 144 struct kvm_vcpu;
 145 extern struct kmem_cache *kvm_vcpu_cache;
 146
 147 /*
 148  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 149  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 150  * mode.
 151  */
 152 struct kvm_mmu {
 153         void (*new_cr3)(struct kvm_vcpu *vcpu);
 154         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 155         void (*free)(struct kvm_vcpu *vcpu);
 156         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 157         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 158                               struct kvm_mmu_page *page);
 159         hpa_t root_hpa;
 160         int root_level;
 161         int shadow_root_level;
 162
 163         u64 *pae_root;
 164 };
 165
 166 #define KVM_NR_MEM_OBJS 40
 167
 168 struct kvm_mmu_memory_cache {
 169         int nobjs;
 170         void *objects[KVM_NR_MEM_OBJS];
 171 };
 172
 173 /*
 174  * We don't want allocation failures within the mmu code, so we preallocate
 175  * enough memory for a single page fault in a cache.
 176  */
 177 struct kvm_guest_debug {
 178         int enabled;
 179         unsigned long bp[4];
 180         int singlestep;
 181 };
 182
 183 enum {
 184         VCPU_REGS_RAX = 0,
 185         VCPU_REGS_RCX = 1,
 186         VCPU_REGS_RDX = 2,
 187         VCPU_REGS_RBX = 3,
 188         VCPU_REGS_RSP = 4,
 189         VCPU_REGS_RBP = 5,
 190         VCPU_REGS_RSI = 6,
 191         VCPU_REGS_RDI = 7,
 192 #ifdef CONFIG_X86_64
 193         VCPU_REGS_R8 = 8,
 194         VCPU_REGS_R9 = 9,
 195         VCPU_REGS_R10 = 10,
 196         VCPU_REGS_R11 = 11,
 197         VCPU_REGS_R12 = 12,
 198         VCPU_REGS_R13 = 13,
 199         VCPU_REGS_R14 = 14,
 200         VCPU_REGS_R15 = 15,
 201 #endif
 202         NR_VCPU_REGS
 203 };
 204
 205 enum {
 206         VCPU_SREG_CS,
 207         VCPU_SREG_DS,
 208         VCPU_SREG_ES,
 209         VCPU_SREG_FS,
 210         VCPU_SREG_GS,
 211         VCPU_SREG_SS,
 212         VCPU_SREG_TR,
 213         VCPU_SREG_LDTR,
 214 };
 215
 216 #include "x86_emulate.h"
 217
 218 struct kvm_pio_request {
 219         unsigned long count;
 220         int cur_count;
 221         struct page *guest_pages[2];
 222         unsigned guest_page_offset;
 223         int in;
 224         int port;
 225         int size;
 226         int string;
 227         int down;
 228         int rep;
 229 };
 230
 231 struct kvm_stat {
 232         u32 pf_fixed;
 233         u32 pf_guest;
 234         u32 tlb_flush;
 235         u32 invlpg;
 236
 237         u32 exits;
 238         u32 io_exits;
 239         u32 mmio_exits;
 240         u32 signal_exits;
 241         u32 irq_window_exits;
 242         u32 halt_exits;
 243         u32 halt_wakeup;
 244         u32 request_irq_exits;
 245         u32 irq_exits;
 246         u32 light_exits;
 247         u32 efer_reload;
 248 };
 249
 250 struct kvm_io_device {
 251         void (*read)(struct kvm_io_device *this,
 252                      gpa_t addr,
 253                      int len,
 254                      void *val);
 255         void (*write)(struct kvm_io_device *this,
 256                       gpa_t addr,
 257                       int len,
 258                       const void *val);
 259         int (*in_range)(struct kvm_io_device *this, gpa_t addr);
 260         void (*destructor)(struct kvm_io_device *this);
 261
 262         void             *private;
 263 };
 264
 265 static inline void kvm_iodevice_read(struct kvm_io_device *dev,
 266                                      gpa_t addr,
 267                                      int len,
 268                                      void *val)
 269 {
 270         dev->read(dev, addr, len, val);
 271 }
 272
 273 static inline void kvm_iodevice_write(struct kvm_io_device *dev,
 274                                       gpa_t addr,
 275                                       int len,
 276                                       const void *val)
 277 {
 278         dev->write(dev, addr, len, val);
 279 }
 280
 281 static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
 282 {
 283         return dev->in_range(dev, addr);
 284 }
 285
 286 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
 287 {
 288         if (dev->destructor)
 289                 dev->destructor(dev);
 290 }
 291
 292 /*
 293  * It would be nice to use something smarter than a linear search, TBD...
 294  * Thankfully we dont expect many devices to register (famous last words :),
 295  * so until then it will suffice.  At least its abstracted so we can change
 296  * in one place.
 297  */
 298 struct kvm_io_bus {
 299         int                   dev_count;
 300 #define NR_IOBUS_DEVS 6
 301         struct kvm_io_device *devs[NR_IOBUS_DEVS];
 302 };
 303
 304 void kvm_io_bus_init(struct kvm_io_bus *bus);
 305 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
 306 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
 307 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
 308                              struct kvm_io_device *dev);
 309
 310 struct kvm_vcpu {
 311         struct kvm *kvm;
 312         struct preempt_notifier preempt_notifier;
 313         int vcpu_id;
 314         struct mutex mutex;
 315         int   cpu;
 316         u64 host_tsc;
 317         struct kvm_run *run;
 318         int interrupt_window_open;
 319         int guest_mode;
 320         unsigned long requests;
 321         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 322         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 323         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 324         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 325
 326         unsigned long cr0;
 327         unsigned long cr2;
 328         unsigned long cr3;
 329         unsigned long cr4;
 330         unsigned long cr8;
 331         u64 pdptrs[4]; /* pae */
 332         u64 shadow_efer;
 333         u64 apic_base;
 334         struct kvm_lapic *apic;    /* kernel irqchip context */
 335 #define VCPU_MP_STATE_RUNNABLE          0
 336 #define VCPU_MP_STATE_UNINITIALIZED     1
 337 #define VCPU_MP_STATE_INIT_RECEIVED     2
 338 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 339 #define VCPU_MP_STATE_HALTED            4
 340         int mp_state;
 341         int sipi_vector;
 342         u64 ia32_misc_enable_msr;
 343
 344         struct kvm_mmu mmu;
 345
 346         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 347         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 348         struct kvm_mmu_memory_cache mmu_page_cache;
 349         struct kvm_mmu_memory_cache mmu_page_header_cache;
 350
 351         gfn_t last_pt_write_gfn;
 352         int   last_pt_write_count;
 353         u64  *last_pte_updated;
 354
 355         struct kvm_guest_debug guest_debug;
 356
 357         struct i387_fxsave_struct host_fx_image;
 358         struct i387_fxsave_struct guest_fx_image;
 359         int fpu_active;
 360         int guest_fpu_loaded;
 361
 362         int mmio_needed;
 363         int mmio_read_completed;
 364         int mmio_is_write;
 365         int mmio_size;
 366         unsigned char mmio_data[8];
 367         gpa_t mmio_phys_addr;
 368         gva_t mmio_fault_cr2;
 369         struct kvm_pio_request pio;
 370         void *pio_data;
 371         wait_queue_head_t wq;
 372
 373         int sigset_active;
 374         sigset_t sigset;
 375
 376         struct kvm_stat stat;
 377
 378         struct {
 379                 int active;
 380                 u8 save_iopl;
 381                 struct kvm_save_segment {
 382                         u16 selector;
 383                         unsigned long base;
 384                         u32 limit;
 385                         u32 ar;
 386                 } tr, es, ds, fs, gs;
 387         } rmode;
 388         int halt_request; /* real mode on Intel only */
 389
 390         int cpuid_nent;
 391         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 392
 393         /* emulate context */
 394
 395         struct x86_emulate_ctxt emulate_ctxt;
 396 };
 397
 398 struct kvm_mem_alias {
 399         gfn_t base_gfn;
 400         unsigned long npages;
 401         gfn_t target_gfn;
 402 };
 403
 404 struct kvm_memory_slot {
 405         gfn_t base_gfn;
 406         unsigned long npages;
 407         unsigned long flags;
 408         struct page **phys_mem;
 409         unsigned long *rmap;
 410         unsigned long *dirty_bitmap;
 411         int user_alloc; /* user allocated memory */
 412 };
 413
 414 struct kvm {
 415         struct mutex lock; /* protects everything except vcpus */
 416         int naliases;
 417         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 418         int nmemslots;
 419         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 420         /*
 421          * Hash table of struct kvm_mmu_page.
 422          */
 423         struct list_head active_mmu_pages;
 424         unsigned int n_free_mmu_pages;
 425         unsigned int n_requested_mmu_pages;
 426         unsigned int n_alloc_mmu_pages;
 427         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 428         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 429         unsigned long rmap_overflow;
 430         struct list_head vm_list;
 431         struct file *filp;
 432         struct kvm_io_bus mmio_bus;
 433         struct kvm_io_bus pio_bus;
 434         struct kvm_pic *vpic;
 435         struct kvm_ioapic *vioapic;
 436         int round_robin_prev_vcpu;
 437 };
 438
 439 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
 440 {
 441         return kvm->vpic;
 442 }
 443
 444 static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 445 {
 446         return kvm->vioapic;
 447 }
 448
 449 static inline int irqchip_in_kernel(struct kvm *kvm)
 450 {
 451         return pic_irqchip(kvm) != 0;
 452 }
 453
 454 struct descriptor_table {
 455         u16 limit;
 456         unsigned long base;
 457 } __attribute__((packed));
 458
 459 struct kvm_x86_ops {
 460         int (*cpu_has_kvm_support)(void);          /* __init */
 461         int (*disabled_by_bios)(void);             /* __init */
 462         void (*hardware_enable)(void *dummy);      /* __init */
 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
 468         /* Create, but do not attach this VCPU */
 469         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 470         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 471         void (*vcpu_reset)(struct kvm_vcpu *vcpu);
 472
 473         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 474         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 475         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 476         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 477
 478         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 479                                struct kvm_debug_guest *dbg);
 480         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 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         void (*set_segment)(struct kvm_vcpu *vcpu,
 487                             struct kvm_segment *var, int seg);
 488         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 489         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 490         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 491         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 492         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 493         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 494         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 495         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 496         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 497         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 498         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 499         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 500                        int *exception);
 501         void (*cache_regs)(struct kvm_vcpu *vcpu);
 502         void (*decache_regs)(struct kvm_vcpu *vcpu);
 503         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 504         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 505
 506         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 507         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 508                                   unsigned long addr, u32 err_code);
 509
 510         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 511
 512         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 513         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 514         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 515         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 516                                 unsigned char *hypercall_addr);
 517         int (*get_irq)(struct kvm_vcpu *vcpu);
 518         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 519         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 520         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 521                                        struct kvm_run *run);
 522 };
 523
 524 extern struct kvm_x86_ops *kvm_x86_ops;
 525
 526 /* The guest did something we don't support. */
 527 #define pr_unimpl(vcpu, fmt, ...)                                       \
 528  do {                                                                   \
 529         if (printk_ratelimit())                                         \
 530                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 531                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 532  } while (0)
 533
 534 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 535 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 536
 537 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 538 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 539
 540 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
 541                   struct module *module);
 542 void kvm_exit_x86(void);
 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
 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 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 556
 557 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 558 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 559 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 560 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 561 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 562 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 563
 564 extern hpa_t bad_page_address;
 565
 566 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 567 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 568 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 569                         int len);
 570 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
 571 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 572                          int offset, int len);
 573 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 574                     unsigned long len);
 575 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
 576 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
 577 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 578 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 579
 580 enum emulation_result {
 581         EMULATE_DONE,       /* no further processing */
 582         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 583         EMULATE_FAIL,         /* can't emulate this instruction */
 584 };
 585
 586 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 587                         unsigned long cr2, u16 error_code, int no_decode);
 588 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 589 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 590 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 591 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 592                    unsigned long *rflags);
 593
 594 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 595 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 596                      unsigned long *rflags);
 597 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 598 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 599
 600 struct x86_emulate_ctxt;
 601
 602 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 603                      int size, unsigned port);
 604 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 605                            int size, unsigned long count, int down,
 606                             gva_t address, int rep, unsigned port);
 607 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 608 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 609 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 610 int emulate_clts(struct kvm_vcpu *vcpu);
 611 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 612                     unsigned long *dest);
 613 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 614                     unsigned long value);
 615
 616 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 617 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 618 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 619 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 620 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 621 void 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 void fx_init(struct kvm_vcpu *vcpu);
 628
 629 void kvm_resched(struct kvm_vcpu *vcpu);
 630 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 631 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 632 void kvm_flush_remote_tlbs(struct kvm *kvm);
 633
 634 int emulator_read_std(unsigned long addr,
 635                       void *val,
 636                       unsigned int bytes,
 637                       struct kvm_vcpu *vcpu);
 638 int emulator_write_emulated(unsigned long addr,
 639                             const void *val,
 640                             unsigned int bytes,
 641                             struct kvm_vcpu *vcpu);
 642
 643 unsigned long segment_base(u16 selector);
 644
 645 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 646                        const u8 *new, int bytes);
 647 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 648 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 649 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 650 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 651
 652 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 653
 654 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 655
 656 long kvm_arch_dev_ioctl(struct file *filp,
 657                         unsigned int ioctl, unsigned long arg);
 658 __init void kvm_arch_init(void);
 659
 660 static inline void kvm_guest_enter(void)
 661 {
 662         current->flags |= PF_VCPU;
 663 }
 664
 665 static inline void kvm_guest_exit(void)
 666 {
 667         current->flags &= ~PF_VCPU;
 668 }
 669
 670 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 671                                      u32 error_code)
 672 {
 673         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 674 }
 675
 676 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
 677 {
 678         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 679                 __kvm_mmu_free_some_pages(vcpu);
 680 }
 681
 682 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 683 {
 684         if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
 685                 return 0;
 686
 687         return kvm_mmu_load(vcpu);
 688 }
 689
 690 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 691 {
 692 #ifdef CONFIG_X86_64
 693         return vcpu->shadow_efer & EFER_LME;
 694 #else
 695         return 0;
 696 #endif
 697 }
 698
 699 static inline int is_pae(struct kvm_vcpu *vcpu)
 700 {
 701         return vcpu->cr4 & X86_CR4_PAE;
 702 }
 703
 704 static inline int is_pse(struct kvm_vcpu *vcpu)
 705 {
 706         return vcpu->cr4 & X86_CR4_PSE;
 707 }
 708
 709 static inline int is_paging(struct kvm_vcpu *vcpu)
 710 {
 711         return vcpu->cr0 & X86_CR0_PG;
 712 }
 713
 714 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 715 {
 716         return slot - kvm->memslots;
 717 }
 718
 719 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 720 {
 721         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 722
 723         return (struct kvm_mmu_page *)page_private(page);
 724 }
 725
 726 static inline u16 read_fs(void)
 727 {
 728         u16 seg;
 729         asm("mov %%fs, %0" : "=g"(seg));
 730         return seg;
 731 }
 732
 733 static inline u16 read_gs(void)
 734 {
 735         u16 seg;
 736         asm("mov %%gs, %0" : "=g"(seg));
 737         return seg;
 738 }
 739
 740 static inline u16 read_ldt(void)
 741 {
 742         u16 ldt;
 743         asm("sldt %0" : "=g"(ldt));
 744         return ldt;
 745 }
 746
 747 static inline void load_fs(u16 sel)
 748 {
 749         asm("mov %0, %%fs" : : "rm"(sel));
 750 }
 751
 752 static inline void load_gs(u16 sel)
 753 {
 754         asm("mov %0, %%gs" : : "rm"(sel));
 755 }
 756
 757 #ifndef load_ldt
 758 static inline void load_ldt(u16 sel)
 759 {
 760         asm("lldt %0" : : "rm"(sel));
 761 }
 762 #endif
 763
 764 static inline void get_idt(struct descriptor_table *table)
 765 {
 766         asm("sidt %0" : "=m"(*table));
 767 }
 768
 769 static inline void get_gdt(struct descriptor_table *table)
 770 {
 771         asm("sgdt %0" : "=m"(*table));
 772 }
 773
 774 static inline unsigned long read_tr_base(void)
 775 {
 776         u16 tr;
 777         asm("str %0" : "=g"(tr));
 778         return segment_base(tr);
 779 }
 780
 781 #ifdef CONFIG_X86_64
 782 static inline unsigned long read_msr(unsigned long msr)
 783 {
 784         u64 value;
 785
 786         rdmsrl(msr, value);
 787         return value;
 788 }
 789 #endif
 790
 791 static inline void fx_save(struct i387_fxsave_struct *image)
 792 {
 793         asm("fxsave (%0)":: "r" (image));
 794 }
 795
 796 static inline void fx_restore(struct i387_fxsave_struct *image)
 797 {
 798         asm("fxrstor (%0)":: "r" (image));
 799 }
 800
 801 static inline void fpu_init(void)
 802 {
 803         asm("finit");
 804 }
 805
 806 static inline u32 get_rdx_init_val(void)
 807 {
 808         return 0x600; /* P6 family */
 809 }
 810
 811 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 812 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 813 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 814 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 815 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 816 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 817 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 818 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 819 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 820
 821 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 822
 823 #define TSS_IOPB_BASE_OFFSET 0x66
 824 #define TSS_BASE_SIZE 0x68
 825 #define TSS_IOPB_SIZE (65536 / 8)
 826 #define TSS_REDIRECTION_SIZE (256 / 8)
 827 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 828
 829 #endif