KVM: Fix OSXSAVE after migration

CPUID's OSXSAVE is a mirror of CR4.OSXSAVE bit. We need to update the CPUID
after migration.

KVM-Stable-Tag.
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cdac9e592aa53ee84b7e184900601ab4730354e5..eb5c83479d895d079ca60e6585b532628ab4944e 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5522,6 +5522,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 
        mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
        kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
+       if (sregs->cr4 & X86_CR4_OSXSAVE)
+               update_cpuid(vcpu);
        if (!is_long_mode(vcpu) && is_pae(vcpu)) {
                load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3);
                mmu_reset_needed = 1;