#ifndef __LINUX_KVM_H
  #define __LINUX_KVM_H
  
  /*
   * Userspace interface for /dev/kvm - kernel based virtual machine
   *
   * Note: this interface is considered experimental and may change without
   *       notice.
   */
  
  #include <asm/types.h>
  #include <linux/ioctl.h>

  #define KVM_API_VERSION 12

  /*
   * Architectural interrupt line count, and the size of the bitmap needed
   * to hold them.
   */
  #define KVM_NR_INTERRUPTS 256
  #define KVM_IRQ_BITMAP_SIZE_BYTES    ((KVM_NR_INTERRUPTS + 7) / 8)
  #define KVM_IRQ_BITMAP_SIZE(type)    (KVM_IRQ_BITMAP_SIZE_BYTES / sizeof(type))
  
  
  /* for KVM_CREATE_MEMORY_REGION */
  struct kvm_memory_region {
  	__u32 slot;
  	__u32 flags;
  	__u64 guest_phys_addr;
  	__u64 memory_size; /* bytes */
  };
  
  /* for kvm_memory_region::flags */
  #define KVM_MEM_LOG_DIRTY_PAGES  1UL

  struct kvm_memory_alias {
  	__u32 slot;  /* this has a different namespace than memory slots */
  	__u32 flags;
  	__u64 guest_phys_addr;
  	__u64 memory_size;
  	__u64 target_phys_addr;
  };

  enum kvm_exit_reason {
  	KVM_EXIT_UNKNOWN          = 0,
  	KVM_EXIT_EXCEPTION        = 1,
  	KVM_EXIT_IO               = 2,

  	KVM_EXIT_HYPERCALL        = 3,

  	KVM_EXIT_DEBUG            = 4,
  	KVM_EXIT_HLT              = 5,
  	KVM_EXIT_MMIO             = 6,

  	KVM_EXIT_IRQ_WINDOW_OPEN  = 7,

  	KVM_EXIT_SHUTDOWN         = 8,

  	KVM_EXIT_FAIL_ENTRY       = 9,

  	KVM_EXIT_INTR             = 10,

  };

  /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */

  struct kvm_run {
  	/* in */

  	__u8 request_interrupt_window;

  	__u8 padding1[7];

  
  	/* out */

  	__u32 exit_reason;

  	__u8 ready_for_interrupt_injection;
  	__u8 if_flag;

  	__u8 padding2[2];

  
  	/* in (pre_kvm_run), out (post_kvm_run) */

  	__u64 cr8;
  	__u64 apic_base;

  	union {
  		/* KVM_EXIT_UNKNOWN */
  		struct {

  			__u64 hardware_exit_reason;

  		} hw;

  		/* KVM_EXIT_FAIL_ENTRY */
  		struct {
  			__u64 hardware_entry_failure_reason;
  		} fail_entry;

  		/* KVM_EXIT_EXCEPTION */
  		struct {
  			__u32 exception;
  			__u32 error_code;
  		} ex;
  		/* KVM_EXIT_IO */

  		struct kvm_io {

  #define KVM_EXIT_IO_IN  0
  #define KVM_EXIT_IO_OUT 1
  			__u8 direction;
  			__u8 size; /* bytes */

  			__u16 port;

  			__u32 count;
  			__u64 data_offset; /* relative to kvm_run start */

  		} io;
  		struct {
  		} debug;
  		/* KVM_EXIT_MMIO */
  		struct {
  			__u64 phys_addr;
  			__u8  data[8];
  			__u32 len;
  			__u8  is_write;
  		} mmio;

  		/* KVM_EXIT_HYPERCALL */
  		struct {
  			__u64 args[6];
  			__u64 ret;
  			__u32 longmode;
  			__u32 pad;
  		} hypercall;

  	};
  };
  
  /* for KVM_GET_REGS and KVM_SET_REGS */
  struct kvm_regs {

  	/* out (KVM_GET_REGS) / in (KVM_SET_REGS) */
  	__u64 rax, rbx, rcx, rdx;
  	__u64 rsi, rdi, rsp, rbp;
  	__u64 r8,  r9,  r10, r11;
  	__u64 r12, r13, r14, r15;
  	__u64 rip, rflags;
  };

  /* for KVM_GET_FPU and KVM_SET_FPU */
  struct kvm_fpu {
  	__u8  fpr[8][16];
  	__u16 fcw;
  	__u16 fsw;
  	__u8  ftwx;  /* in fxsave format */
  	__u8  pad1;
  	__u16 last_opcode;
  	__u64 last_ip;
  	__u64 last_dp;
  	__u8  xmm[16][16];
  	__u32 mxcsr;
  	__u32 pad2;
  };

  struct kvm_segment {
  	__u64 base;
  	__u32 limit;
  	__u16 selector;
  	__u8  type;
  	__u8  present, dpl, db, s, l, g, avl;
  	__u8  unusable;
  	__u8  padding;
  };
  
  struct kvm_dtable {
  	__u64 base;
  	__u16 limit;
  	__u16 padding[3];
  };
  
  /* for KVM_GET_SREGS and KVM_SET_SREGS */
  struct kvm_sregs {

  	/* out (KVM_GET_SREGS) / in (KVM_SET_SREGS) */
  	struct kvm_segment cs, ds, es, fs, gs, ss;
  	struct kvm_segment tr, ldt;
  	struct kvm_dtable gdt, idt;
  	__u64 cr0, cr2, cr3, cr4, cr8;
  	__u64 efer;
  	__u64 apic_base;
  	__u64 interrupt_bitmap[KVM_IRQ_BITMAP_SIZE(__u64)];
  };
  
  struct kvm_msr_entry {
  	__u32 index;
  	__u32 reserved;
  	__u64 data;
  };
  
  /* for KVM_GET_MSRS and KVM_SET_MSRS */
  struct kvm_msrs {

  	__u32 nmsrs; /* number of msrs in entries */

  	__u32 pad;

  
  	struct kvm_msr_entry entries[0];
  };
  
  /* for KVM_GET_MSR_INDEX_LIST */
  struct kvm_msr_list {
  	__u32 nmsrs; /* number of msrs in entries */
  	__u32 indices[0];
  };
  
  /* for KVM_TRANSLATE */
  struct kvm_translation {
  	/* in */
  	__u64 linear_address;

  
  	/* out */
  	__u64 physical_address;
  	__u8  valid;
  	__u8  writeable;
  	__u8  usermode;

  	__u8  pad[5];

  };
  
  /* for KVM_INTERRUPT */
  struct kvm_interrupt {
  	/* in */

  	__u32 irq;
  };
  
  struct kvm_breakpoint {
  	__u32 enabled;
  	__u32 padding;
  	__u64 address;
  };
  
  /* for KVM_DEBUG_GUEST */
  struct kvm_debug_guest {
  	/* int */

  	__u32 enabled;

  	__u32 pad;

  	struct kvm_breakpoint breakpoints[4];
  	__u32 singlestep;
  };
  
  /* for KVM_GET_DIRTY_LOG */
  struct kvm_dirty_log {
  	__u32 slot;
  	__u32 padding;
  	union {
  		void __user *dirty_bitmap; /* one bit per page */
  		__u64 padding;
  	};
  };

  struct kvm_cpuid_entry {
  	__u32 function;
  	__u32 eax;
  	__u32 ebx;
  	__u32 ecx;
  	__u32 edx;
  	__u32 padding;
  };
  
  /* for KVM_SET_CPUID */
  struct kvm_cpuid {
  	__u32 nent;
  	__u32 padding;
  	struct kvm_cpuid_entry entries[0];
  };

  /* for KVM_SET_SIGNAL_MASK */
  struct kvm_signal_mask {
  	__u32 len;
  	__u8  sigset[0];
  };

  #define KVMIO 0xAE

  /*
   * ioctls for /dev/kvm fds:
   */

  #define KVM_GET_API_VERSION       _IO(KVMIO,   0x00)
  #define KVM_CREATE_VM             _IO(KVMIO,   0x01) /* returns a VM fd */
  #define KVM_GET_MSR_INDEX_LIST    _IOWR(KVMIO, 0x02, struct kvm_msr_list)

  /*
   * Check if a kvm extension is available.  Argument is extension number,
   * return is 1 (yes) or 0 (no, sorry).
   */
  #define KVM_CHECK_EXTENSION       _IO(KVMIO,   0x03)

  /*
   * Get size for mmap(vcpu_fd)
   */
  #define KVM_GET_VCPU_MMAP_SIZE    _IO(KVMIO,   0x04) /* in bytes */

  
  /*
   * ioctls for VM fds
   */

  #define KVM_SET_MEMORY_REGION     _IOW(KVMIO, 0x40, struct kvm_memory_region)

  /*
   * KVM_CREATE_VCPU receives as a parameter the vcpu slot, and returns
   * a vcpu fd.
   */

  #define KVM_CREATE_VCPU           _IO(KVMIO,  0x41)
  #define KVM_GET_DIRTY_LOG         _IOW(KVMIO, 0x42, struct kvm_dirty_log)

  #define KVM_SET_MEMORY_ALIAS      _IOW(KVMIO, 0x43, struct kvm_memory_alias)

  
  /*
   * ioctls for vcpu fds
   */

  #define KVM_RUN                   _IO(KVMIO,   0x80)
  #define KVM_GET_REGS              _IOR(KVMIO,  0x81, struct kvm_regs)
  #define KVM_SET_REGS              _IOW(KVMIO,  0x82, struct kvm_regs)
  #define KVM_GET_SREGS             _IOR(KVMIO,  0x83, struct kvm_sregs)
  #define KVM_SET_SREGS             _IOW(KVMIO,  0x84, struct kvm_sregs)
  #define KVM_TRANSLATE             _IOWR(KVMIO, 0x85, struct kvm_translation)
  #define KVM_INTERRUPT             _IOW(KVMIO,  0x86, struct kvm_interrupt)
  #define KVM_DEBUG_GUEST           _IOW(KVMIO,  0x87, struct kvm_debug_guest)
  #define KVM_GET_MSRS              _IOWR(KVMIO, 0x88, struct kvm_msrs)
  #define KVM_SET_MSRS              _IOW(KVMIO,  0x89, struct kvm_msrs)
  #define KVM_SET_CPUID             _IOW(KVMIO,  0x8a, struct kvm_cpuid)

  #define KVM_SET_SIGNAL_MASK       _IOW(KVMIO,  0x8b, struct kvm_signal_mask)

  #define KVM_GET_FPU               _IOR(KVMIO,  0x8c, struct kvm_fpu)
  #define KVM_SET_FPU               _IOW(KVMIO,  0x8d, struct kvm_fpu)

  
  #endif