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KVM: x86: XSAVE/XRSTOR live migration support

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This patch enable save/restore of xsave state.

Signed-off-by: Sheng Yang <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Sheng Yang 2010-06-13 17:29:39 +08:00 • committed by Avi Kivity
commit 2d5b5a6655
5 changed files with 252 additions and 2 deletions
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74
Documentation/kvm/api.txt
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@ -922,6 +922,80 @@ Define which vcpu is the Bootstrap Processor (BSP). Values are the same
as the vcpu id in KVM_CREATE_VCPU. If this ioctl is not called, the default
is vcpu 0.
4.41 KVM_GET_XSAVE
Capability: KVM_CAP_XSAVE
Architectures: x86
Type: vcpu ioctl
Parameters: struct kvm_xsave (out)
Returns: 0 on success, -1 on error
struct kvm_xsave {
__u32 region[1024];
};
This ioctl would copy current vcpu's xsave struct to the userspace.
4.42 KVM_SET_XSAVE
Capability: KVM_CAP_XSAVE
Architectures: x86
Type: vcpu ioctl
Parameters: struct kvm_xsave (in)
Returns: 0 on success, -1 on error
struct kvm_xsave {
__u32 region[1024];
};
This ioctl would copy userspace's xsave struct to the kernel.
4.43 KVM_GET_XCRS
Capability: KVM_CAP_XCRS
Architectures: x86
Type: vcpu ioctl
Parameters: struct kvm_xcrs (out)
Returns: 0 on success, -1 on error
struct kvm_xcr {
__u32 xcr;
__u32 reserved;
__u64 value;
};
struct kvm_xcrs {
__u32 nr_xcrs;
__u32 flags;
struct kvm_xcr xcrs[KVM_MAX_XCRS];
__u64 padding[16];
};
This ioctl would copy current vcpu's xcrs to the userspace.
4.44 KVM_SET_XCRS
Capability: KVM_CAP_XCRS
Architectures: x86
Type: vcpu ioctl
Parameters: struct kvm_xcrs (in)
Returns: 0 on success, -1 on error
struct kvm_xcr {
__u32 xcr;
__u32 reserved;
__u64 value;
};
struct kvm_xcrs {
__u32 nr_xcrs;
__u32 flags;
struct kvm_xcr xcrs[KVM_MAX_XCRS];
__u64 padding[16];
};
This ioctl would set vcpu's xcr to the value userspace specified.
5. The kvm_run structure
Application code obtains a pointer to the kvm_run structure by