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    Subject[PATCH 1/7] KVM: userspace interface
    This patch defines a bunch of ioctl()s on /dev/kvm.  The ioctl()s allow
    adding
    memory to a virtual machine, adding a virtual cpu to a virtual machine (at
    most one at this time), transferring control to the virtual cpu, and
    querying
    about guest pages changed by the virtual machine.

    Signed-off-by: Yaniv Kamay <yaniv@qumranet.com>
    Signed-off-by: Avi Kivity <avi@qumranet.com>

    Index: linux-2.6/include/linux/kvm.h
    ===================================================================
    --- /dev/null
    +++ linux-2.6/include/linux/kvm.h
    @@ -0,0 +1,202 @@
    +#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>
    +
    +#ifndef __user
    +#define __user
    +#endif
    +
    +/* 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,
    + KVM_EXIT_EXCEPTION,
    + KVM_EXIT_IO,
    + KVM_EXIT_CPUID,
    + KVM_EXIT_DEBUG,
    + KVM_EXIT_HLT,
    + KVM_EXIT_MMIO,
    +};
    +
    +/* for KVM_RUN */
    +struct kvm_run {
    + /* in */
    + __u32 vcpu;
    + __u32 emulated; /* skip current instruction */
    + __u32 mmio_completed; /* mmio request completed */
    +
    + /* out */
    + __u32 exit_type;
    + __u32 exit_reason;
    + __u32 instruction_length;
    + 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;
    +
    + /* out (KVM_GET_SREGS) */
    + __u32 pending_int;
    + __u32 padding2;
    +};
    +
    +/* for KVM_TRANSLATE */
    +struct kvm_translation {
    + /* in */
    + __u64 linear_address;
    + __u32 vcpu;
    + __u32 padding;
    +
    + /* out */
    + __u64 physical_address;
    + __u8 valid;
    + __u8 writeable;
    + __u8 usermode;
    +};
    +
    +/* 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
    +
    +#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)
    +
    +#endif
    --
    error compiling committee.c: too many arguments to function

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