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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 <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Sheng Yang
2010-06-13 17:29:39 +08:00
committed by Avi Kivity
parent 69b61833f7
commit 2d5b5a6655
5 changed files with 252 additions and 2 deletions
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139
arch/x86/kvm/x86.c
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@ -1680,6 +1680,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_PCI_SEGMENT:
case KVM_CAP_DEBUGREGS:
case KVM_CAP_X86_ROBUST_SINGLESTEP:
case KVM_CAP_XSAVE:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@ -1703,6 +1704,9 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_MCE:
r = KVM_MAX_MCE_BANKS;
break;
case KVM_CAP_XCRS:
r = cpu_has_xsave;
break;
default:
r = 0;
break;
@ -2355,6 +2359,77 @@ static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
return 0;
}
static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
struct kvm_xsave *guest_xsave)
{
if (cpu_has_xsave)
memcpy(guest_xsave->region,
&vcpu->arch.guest_fpu.state->xsave,
sizeof(struct xsave_struct));
else {
memcpy(guest_xsave->region,
&vcpu->arch.guest_fpu.state->fxsave,
sizeof(struct i387_fxsave_struct));
*(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
XSTATE_FPSSE;
}
}
static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
struct kvm_xsave *guest_xsave)
{
u64 xstate_bv =
*(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
if (cpu_has_xsave)
memcpy(&vcpu->arch.guest_fpu.state->xsave,
guest_xsave->region, sizeof(struct xsave_struct));
else {
if (xstate_bv & ~XSTATE_FPSSE)
return -EINVAL;
memcpy(&vcpu->arch.guest_fpu.state->fxsave,
guest_xsave->region, sizeof(struct i387_fxsave_struct));
}
return 0;
}
static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
struct kvm_xcrs *guest_xcrs)
{
if (!cpu_has_xsave) {
guest_xcrs->nr_xcrs = 0;
return;
}
guest_xcrs->nr_xcrs = 1;
guest_xcrs->flags = 0;
guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
}
static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
struct kvm_xcrs *guest_xcrs)
{
int i, r = 0;
if (!cpu_has_xsave)
return -EINVAL;
if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
return -EINVAL;
for (i = 0; i < guest_xcrs->nr_xcrs; i++)
/* Only support XCR0 currently */
if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
guest_xcrs->xcrs[0].value);
break;
}
if (r)
r = -EINVAL;
return r;
}
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@ -2556,6 +2631,70 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
break;
}
case KVM_GET_XSAVE: {
struct kvm_xsave *xsave;
xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
r = -ENOMEM;
if (!xsave)
break;
kvm_vcpu_ioctl_x86_get_xsave(vcpu, xsave);
r = -EFAULT;
if (copy_to_user(argp, xsave, sizeof(struct kvm_xsave)))
break;
r = 0;
break;
}
case KVM_SET_XSAVE: {
struct kvm_xsave *xsave;
xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
r = -ENOMEM;
if (!xsave)
break;
r = -EFAULT;
if (copy_from_user(xsave, argp, sizeof(struct kvm_xsave)))
break;
r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, xsave);
break;
}
case KVM_GET_XCRS: {
struct kvm_xcrs *xcrs;
xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
r = -ENOMEM;
if (!xcrs)
break;
kvm_vcpu_ioctl_x86_get_xcrs(vcpu, xcrs);
r = -EFAULT;
if (copy_to_user(argp, xcrs,
sizeof(struct kvm_xcrs)))
break;
r = 0;
break;
}
case KVM_SET_XCRS: {
struct kvm_xcrs *xcrs;
xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
r = -ENOMEM;
if (!xcrs)
break;
r = -EFAULT;
if (copy_from_user(xcrs, argp,
sizeof(struct kvm_xcrs)))
break;
r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, xcrs);
break;
}
default:
r = -EINVAL;
}