include/linux/kvm.h

#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 3

/*
 * 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


#define KVM_EXIT_TYPE_FAIL_ENTRY 1
#define KVM_EXIT_TYPE_VM_EXIT    2

enum kvm_exit_reason {
	KVM_EXIT_UNKNOWN          = 0,
	KVM_EXIT_EXCEPTION        = 1,
	KVM_EXIT_IO               = 2,
	KVM_EXIT_CPUID            = 3,
	KVM_EXIT_DEBUG            = 4,
	KVM_EXIT_HLT              = 5,
	KVM_EXIT_MMIO             = 6,
	KVM_EXIT_IRQ_WINDOW_OPEN  = 7,
	KVM_EXIT_SHUTDOWN         = 8,
};

/* for KVM_RUN */
struct kvm_run {
	/* in */
	__u32 vcpu;
	__u32 emulated;  /* skip current instruction */
	__u32 mmio_completed; /* mmio request completed */
	__u8 request_interrupt_window;
	__u8 padding1[3];

	/* out */
	__u32 exit_type;
	__u32 exit_reason;
	__u32 instruction_length;
	__u8 ready_for_interrupt_injection;
	__u8 if_flag;
	__u16 padding2;

	/* in (pre_kvm_run), out (post_kvm_run) */
	__u64 cr8;
	__u64 apic_base;

	union {
		/* KVM_EXIT_UNKNOWN */
		struct {
			__u32 hardware_exit_reason;
		} hw;
		/* KVM_EXIT_EXCEPTION */
		struct {
			__u32 exception;
			__u32 error_code;
		} ex;
		/* KVM_EXIT_IO */
		struct {
#define KVM_EXIT_IO_IN  0
#define KVM_EXIT_IO_OUT 1
			__u8 direction;
			__u8 size; /* bytes */
			__u8 string;
			__u8 string_down;
			__u8 rep;
			__u8 pad;
			__u16 port;
			__u64 count;
			union {
				__u64 address;
				__u32 value;
			};
		} io;
		struct {
		} debug;
		/* KVM_EXIT_MMIO */
		struct {
			__u64 phys_addr;
			__u8  data[8];
			__u32 len;
			__u8  is_write;
		} mmio;
	};
};

/* for KVM_GET_REGS and KVM_SET_REGS */
struct kvm_regs {
	/* in */
	__u32 vcpu;
	__u32 padding;

	/* 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;
};

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 {
	/* in */
	__u32 vcpu;
	__u32 padding;

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

	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;
	__u32 vcpu;
	__u32 padding;

	/* out */
	__u64 physical_address;
	__u8  valid;
	__u8  writeable;
	__u8  usermode;
	__u8  pad[5];
};

/* for KVM_INTERRUPT */
struct kvm_interrupt {
	/* in */
	__u32 vcpu;
	__u32 irq;
};

struct kvm_breakpoint {
	__u32 enabled;
	__u32 padding;
	__u64 address;
};

/* for KVM_DEBUG_GUEST */
struct kvm_debug_guest {
	/* int */
	__u32 vcpu;
	__u32 enabled;
	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;
	};
};

#define KVMIO 0xAE

/*
 * ioctls for /dev/kvm fds:
 */
#define KVM_GET_API_VERSION       _IO(KVMIO, 1)
#define KVM_CREATE_VM             _IO(KVMIO, 2) /* returns a VM fd */
#define KVM_GET_MSR_INDEX_LIST    _IOWR(KVMIO, 15, struct kvm_msr_list)

/*
 * ioctls for VM fds
 */
#define KVM_RUN                   _IOWR(KVMIO, 2, struct kvm_run)
#define KVM_GET_REGS              _IOWR(KVMIO, 3, struct kvm_regs)
#define KVM_SET_REGS              _IOW(KVMIO, 4, struct kvm_regs)
#define KVM_GET_SREGS             _IOWR(KVMIO, 5, struct kvm_sregs)
#define KVM_SET_SREGS             _IOW(KVMIO, 6, struct kvm_sregs)
#define KVM_TRANSLATE             _IOWR(KVMIO, 7, struct kvm_translation)
#define KVM_INTERRUPT             _IOW(KVMIO, 8, struct kvm_interrupt)
#define KVM_DEBUG_GUEST           _IOW(KVMIO, 9, struct kvm_debug_guest)
#define KVM_SET_MEMORY_REGION     _IOW(KVMIO, 10, struct kvm_memory_region)
#define KVM_CREATE_VCPU           _IOW(KVMIO, 11, int /* vcpu_slot */)
#define KVM_GET_DIRTY_LOG         _IOW(KVMIO, 12, struct kvm_dirty_log)
#define KVM_GET_MSRS              _IOWR(KVMIO, 13, struct kvm_msrs)
#define KVM_SET_MSRS              _IOWR(KVMIO, 14, struct kvm_msrs)

#endif