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#ifndef __KVM_H
#define __KVM_H

 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.

#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/preempt.h>
#include <asm/signal.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>

#define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)

#define KVM_GUEST_CR0_MASK \
      (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
       | X86_CR0_NW | X86_CR0_CD)
#define KVM_VM_CR0_ALWAYS_ON \
      (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
       | X86_CR0_MP)
#define KVM_GUEST_CR4_MASK \
      (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)

#define INVALID_PAGE (~(hpa_t)0)
#define UNMAPPED_GVA (~(gpa_t)0)

#define KVM_MAX_VCPUS 4
#define KVM_NUM_MMU_PAGES 1024

#define DE_VECTOR 0
#define NM_VECTOR 7
#define DF_VECTOR 8
#define TS_VECTOR 10
#define NP_VECTOR 11
#define SS_VECTOR 12
#define GP_VECTOR 13
#define PF_VECTOR 14

#define SELECTOR_TI_MASK (1 << 2)
#define SELECTOR_RPL_MASK 0x03

#define IOPL_SHIFT 12


 * vcpu->requests bit members
#define KVM_TLB_FLUSH 0

 * Address types:
 *  gva - guest virtual address
 *  gpa - guest physical address
 *  gfn - guest frame number
 *  hva - host virtual address
 *  hpa - host physical address
 *  hfn - host frame number

typedef unsigned long  gva_t;
typedef u64            gpa_t;
typedef unsigned long  gfn_t;

typedef unsigned long  hva_t;
typedef u64            hpa_t;
typedef unsigned long  hfn_t;


struct kvm_pte_chain {
      u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
      struct hlist_node link;

 * kvm_mmu_page_role, below, is defined as:
 *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 *   bits 4:7 - page table level for this shadow (1-4)
 *   bits 8:9 - page table quadrant for 2-level guests
 *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 *   bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
union kvm_mmu_page_role {
      unsigned word;
      struct {
            unsigned glevels : 4;
            unsigned level : 4;
            unsigned quadrant : 2;
            unsigned pad_for_nice_hex_output : 6;
            unsigned metaphysical : 1;
            unsigned hugepage_access : 3;

struct kvm_mmu_page {
      struct list_head link;
      struct hlist_node hash_link;

       * The following two entries are used to key the shadow page in the
       * hash table.
      gfn_t gfn;
      union kvm_mmu_page_role role;

      u64 *spt;
      unsigned long slot_bitmap; /* One bit set per slot which has memory
                            * in this shadow page.
      int multimapped;         /* More than one parent_pte? */
      int root_count;          /* Currently serving as active root */
      union {
            u64 *parent_pte;               /* !multimapped */
            struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */

struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;

 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 * mode.
struct kvm_mmu {
      void (*new_cr3)(struct kvm_vcpu *vcpu);
      int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
      void (*free)(struct kvm_vcpu *vcpu);
      gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
      hpa_t root_hpa;
      int root_level;
      int shadow_root_level;

      u64 *pae_root;

#define KVM_NR_MEM_OBJS 20

struct kvm_mmu_memory_cache {
      int nobjs;
      void *objects[KVM_NR_MEM_OBJS];

 * We don't want allocation failures within the mmu code, so we preallocate
 * enough memory for a single page fault in a cache.
struct kvm_guest_debug {
      int enabled;
      unsigned long bp[4];
      int singlestep;

enum {
      VCPU_REGS_RAX = 0,
      VCPU_REGS_RCX = 1,
      VCPU_REGS_RDX = 2,
      VCPU_REGS_RBX = 3,
      VCPU_REGS_RSP = 4,
      VCPU_REGS_RBP = 5,
      VCPU_REGS_RSI = 6,
      VCPU_REGS_RDI = 7,
#ifdef CONFIG_X86_64
      VCPU_REGS_R8 = 8,
      VCPU_REGS_R9 = 9,
      VCPU_REGS_R10 = 10,
      VCPU_REGS_R11 = 11,
      VCPU_REGS_R12 = 12,
      VCPU_REGS_R13 = 13,
      VCPU_REGS_R14 = 14,
      VCPU_REGS_R15 = 15,

enum {

struct kvm_pio_request {
      unsigned long count;
      int cur_count;
      struct page *guest_pages[2];
      unsigned guest_page_offset;
      int in;
      int port;
      int size;
      int string;
      int down;
      int rep;

struct kvm_stat {
      u32 pf_fixed;
      u32 pf_guest;
      u32 tlb_flush;
      u32 invlpg;

      u32 exits;
      u32 io_exits;
      u32 mmio_exits;
      u32 signal_exits;
      u32 irq_window_exits;
      u32 halt_exits;
      u32 halt_wakeup;
      u32 request_irq_exits;
      u32 irq_exits;
      u32 light_exits;
      u32 efer_reload;

struct kvm_io_device {
      void (*read)(struct kvm_io_device *this,
                 gpa_t addr,
                 int len,
                 void *val);
      void (*write)(struct kvm_io_device *this,
                  gpa_t addr,
                  int len,
                  const void *val);
      int (*in_range)(struct kvm_io_device *this, gpa_t addr);
      void (*destructor)(struct kvm_io_device *this);

      void             *private;

static inline void kvm_iodevice_read(struct kvm_io_device *dev,
                             gpa_t addr,
                             int len,
                             void *val)
      dev->read(dev, addr, len, val);

static inline void kvm_iodevice_write(struct kvm_io_device *dev,
                              gpa_t addr,
                              int len,
                              const void *val)
      dev->write(dev, addr, len, val);

static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
      return dev->in_range(dev, addr);

static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
      if (dev->destructor)

 * It would be nice to use something smarter than a linear search, TBD...
 * Thankfully we dont expect many devices to register (famous last words :),
 * so until then it will suffice.  At least its abstracted so we can change
 * in one place.
struct kvm_io_bus {
      int                   dev_count;
#define NR_IOBUS_DEVS 6
      struct kvm_io_device *devs[NR_IOBUS_DEVS];

void kvm_io_bus_init(struct kvm_io_bus *bus);
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
                       struct kvm_io_device *dev);

struct kvm_vcpu {
      struct kvm *kvm;
      struct preempt_notifier preempt_notifier;
      int vcpu_id;
      struct mutex mutex;
      int   cpu;
      u64 host_tsc;
      struct kvm_run *run;
      int interrupt_window_open;
      int guest_mode;
      unsigned long requests;
      unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
      unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
      unsigned long rip;      /* needs vcpu_load_rsp_rip() */

      unsigned long cr0;
      unsigned long cr2;
      unsigned long cr3;
      gpa_t para_state_gpa;
      struct page *para_state_page;
      gpa_t hypercall_gpa;
      unsigned long cr4;
      unsigned long cr8;
      u64 pdptrs[4]; /* pae */
      u64 shadow_efer;
      u64 apic_base;
      struct kvm_lapic *apic;    /* kernel irqchip context */
#define VCPU_MP_STATE_RUNNABLE          0
#define VCPU_MP_STATE_HALTED            4
      int mp_state;
      int sipi_vector;
      u64 ia32_misc_enable_msr;

      struct kvm_mmu mmu;

      struct kvm_mmu_memory_cache mmu_pte_chain_cache;
      struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
      struct kvm_mmu_memory_cache mmu_page_cache;
      struct kvm_mmu_memory_cache mmu_page_header_cache;

      gfn_t last_pt_write_gfn;
      int   last_pt_write_count;

      struct kvm_guest_debug guest_debug;

      struct i387_fxsave_struct host_fx_image;
      struct i387_fxsave_struct guest_fx_image;
      int fpu_active;
      int guest_fpu_loaded;

      int mmio_needed;
      int mmio_read_completed;
      int mmio_is_write;
      int mmio_size;
      unsigned char mmio_data[8];
      gpa_t mmio_phys_addr;
      gva_t mmio_fault_cr2;
      struct kvm_pio_request pio;
      void *pio_data;
      wait_queue_head_t wq;

      int sigset_active;
      sigset_t sigset;

      struct kvm_stat stat;

      struct {
            int active;
            u8 save_iopl;
            struct kvm_save_segment {
                  u16 selector;
                  unsigned long base;
                  u32 limit;
                  u32 ar;
            } tr, es, ds, fs, gs;
      } rmode;
      int halt_request; /* real mode on Intel only */

      int cpuid_nent;
      struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];

struct kvm_mem_alias {
      gfn_t base_gfn;
      unsigned long npages;
      gfn_t target_gfn;

struct kvm_memory_slot {
      gfn_t base_gfn;
      unsigned long npages;
      unsigned long flags;
      struct page **phys_mem;
      unsigned long *dirty_bitmap;

struct kvm {
      struct mutex lock; /* protects everything except vcpus */
      int naliases;
      struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
      int nmemslots;
      struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
       * Hash table of struct kvm_mmu_page.
      struct list_head active_mmu_pages;
      int n_free_mmu_pages;
      struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
      struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
      unsigned long rmap_overflow;
      struct list_head vm_list;
      struct file *filp;
      struct kvm_io_bus mmio_bus;
      struct kvm_io_bus pio_bus;
      struct kvm_pic *vpic;
      struct kvm_ioapic *vioapic;
      int round_robin_prev_vcpu;

static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
      return kvm->vpic;

static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
      return kvm->vioapic;

static inline int irqchip_in_kernel(struct kvm *kvm)
      return pic_irqchip(kvm) != 0;

struct descriptor_table {
      u16 limit;
      unsigned long base;
} __attribute__((packed));

struct kvm_x86_ops {
      int (*cpu_has_kvm_support)(void);          /* __init */
      int (*disabled_by_bios)(void);             /* __init */
      void (*hardware_enable)(void *dummy);      /* __init */
      void (*hardware_disable)(void *dummy);
      void (*check_processor_compatibility)(void *rtn);
      int (*hardware_setup)(void);               /* __init */
      void (*hardware_unsetup)(void);            /* __exit */

      /* Create, but do not attach this VCPU */
      struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
      void (*vcpu_free)(struct kvm_vcpu *vcpu);
      void (*vcpu_reset)(struct kvm_vcpu *vcpu);

      void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
      void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
      void (*vcpu_put)(struct kvm_vcpu *vcpu);
      void (*vcpu_decache)(struct kvm_vcpu *vcpu);

      int (*set_guest_debug)(struct kvm_vcpu *vcpu,
                         struct kvm_debug_guest *dbg);
      void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
      int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
      int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
      u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
      void (*get_segment)(struct kvm_vcpu *vcpu,
                      struct kvm_segment *var, int seg);
      void (*set_segment)(struct kvm_vcpu *vcpu,
                      struct kvm_segment *var, int seg);
      void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
      void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
      void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
      void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
      void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
      void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
      void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
      void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
      void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
      void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
      unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
      void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
                   int *exception);
      void (*cache_regs)(struct kvm_vcpu *vcpu);
      void (*decache_regs)(struct kvm_vcpu *vcpu);
      unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
      void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);

      void (*tlb_flush)(struct kvm_vcpu *vcpu);
      void (*inject_page_fault)(struct kvm_vcpu *vcpu,
                          unsigned long addr, u32 err_code);

      void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);

      void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
      int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
      void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
      void (*patch_hypercall)(struct kvm_vcpu *vcpu,
                        unsigned char *hypercall_addr);
      int (*get_irq)(struct kvm_vcpu *vcpu);
      void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
      void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
      void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
                               struct kvm_run *run);

extern struct kvm_x86_ops *kvm_x86_ops;

/* The guest did something we don't support. */
#define pr_unimpl(vcpu, fmt, ...)                           \
 do {                                                 \
      if (printk_ratelimit())                               \
            printk(KERN_ERR "kvm: %i: cpu%i " fmt,                \
                   current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 } while(0)

#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)

int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);

int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
              struct module *module);
void kvm_exit_x86(void);

int kvm_mmu_module_init(void);
void kvm_mmu_module_exit(void);

void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
int kvm_mmu_create(struct kvm_vcpu *vcpu);
int kvm_mmu_setup(struct kvm_vcpu *vcpu);

int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
void kvm_mmu_zap_all(struct kvm *kvm);

hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);

extern hpa_t bad_page_address;

struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

enum emulation_result {
      EMULATE_DONE,       /* no further processing */
      EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
      EMULATE_FAIL,         /* can't emulate this instruction */

int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
                  unsigned long cr2, u16 error_code);
void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
               unsigned long *rflags);

unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
                 unsigned long *rflags);
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);

struct x86_emulate_ctxt;

int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
                 int size, unsigned port);
int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
                     int size, unsigned long count, int down,
                      gva_t address, int rep, unsigned port);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_halt(struct kvm_vcpu *vcpu);
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
int emulate_clts(struct kvm_vcpu *vcpu);
int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
                unsigned long *dest);
int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
                unsigned long value);

void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
unsigned long get_cr8(struct kvm_vcpu *vcpu);
void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);

int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);

void fx_init(struct kvm_vcpu *vcpu);

void kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_flush_remote_tlbs(struct kvm *kvm);

int emulator_read_std(unsigned long addr,
                      void *val,
                  unsigned int bytes,
                  struct kvm_vcpu *vcpu);
int emulator_write_emulated(unsigned long addr,
                      const void *val,
                      unsigned int bytes,
                      struct kvm_vcpu *vcpu);

unsigned long segment_base(u16 selector);

void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                   const u8 *new, int bytes);
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
int kvm_mmu_load(struct kvm_vcpu *vcpu);
void kvm_mmu_unload(struct kvm_vcpu *vcpu);

int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);

static inline void kvm_guest_enter(void)
      current->flags |= PF_VCPU;

static inline void kvm_guest_exit(void)
      current->flags &= ~PF_VCPU;

static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
                             u32 error_code)
      return vcpu->mmu.page_fault(vcpu, gva, error_code);

static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
      if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))

static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
      if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
            return 0;

      return kvm_mmu_load(vcpu);

static inline int is_long_mode(struct kvm_vcpu *vcpu)
#ifdef CONFIG_X86_64
      return vcpu->shadow_efer & EFER_LME;
      return 0;

static inline int is_pae(struct kvm_vcpu *vcpu)
      return vcpu->cr4 & X86_CR4_PAE;

static inline int is_pse(struct kvm_vcpu *vcpu)
      return vcpu->cr4 & X86_CR4_PSE;

static inline int is_paging(struct kvm_vcpu *vcpu)
      return vcpu->cr0 & X86_CR0_PG;

static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
      return slot - kvm->memslots;

static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
      struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);

      return (struct kvm_mmu_page *)page_private(page);

static inline u16 read_fs(void)
      u16 seg;
      asm ("mov %%fs, %0" : "=g"(seg));
      return seg;

static inline u16 read_gs(void)
      u16 seg;
      asm ("mov %%gs, %0" : "=g"(seg));
      return seg;

static inline u16 read_ldt(void)
      u16 ldt;
      asm ("sldt %0" : "=g"(ldt));
      return ldt;

static inline void load_fs(u16 sel)
      asm ("mov %0, %%fs" : : "rm"(sel));

static inline void load_gs(u16 sel)
      asm ("mov %0, %%gs" : : "rm"(sel));

#ifndef load_ldt
static inline void load_ldt(u16 sel)
      asm ("lldt %0" : : "rm"(sel));

static inline void get_idt(struct descriptor_table *table)
      asm ("sidt %0" : "=m"(*table));

static inline void get_gdt(struct descriptor_table *table)
      asm ("sgdt %0" : "=m"(*table));

static inline unsigned long read_tr_base(void)
      u16 tr;
      asm ("str %0" : "=g"(tr));
      return segment_base(tr);

#ifdef CONFIG_X86_64
static inline unsigned long read_msr(unsigned long msr)
      u64 value;

      rdmsrl(msr, value);
      return value;

static inline void fx_save(struct i387_fxsave_struct *image)
      asm ("fxsave (%0)":: "r" (image));

static inline void fx_restore(struct i387_fxsave_struct *image)
      asm ("fxrstor (%0)":: "r" (image));

static inline void fpu_init(void)
      asm ("finit");

static inline u32 get_rdx_init_val(void)
      return 0x600; /* P6 family */

#define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
#define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
#define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
#define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
#define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
#define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
#define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
#define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
#define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"

#define MSR_IA32_TIME_STAMP_COUNTER       0x010

#define TSS_BASE_SIZE 0x68
#define TSS_IOPB_SIZE (65536 / 8)
#define TSS_REDIRECTION_SIZE (256 / 8)


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