Messages in this thread |  | | From | Jim Mattson <> | Date | Sun, 8 Oct 2017 15:36:37 -0700 | Subject | Re: [PATCH 2/2] KVM: X86: XCR0 should be set to the fixed value on vCPU reset |
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Reviewed-by: Jim Mattson <jmattson@google.com>
On Sat, Oct 7, 2017 at 7:35 PM, Wanpeng Li <kernellwp@gmail.com> wrote: > From: Wanpeng Li <wanpeng.li@hotmail.com> > > SDM section 2.6 mentioned: > > After reset, all bits (except bit 0) in XCR0 are cleared to zero; XCR0[0] is set to 1. > > This patch sets XCRO to the 0x1 after vCPU reset. > > Cc: Paolo Bonzini <pbonzini@redhat.com> > Cc: Radim Krčmář <rkrcmar@redhat.com> > Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> > --- > arch/x86/kvm/x86.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index b0d2915..c784cd6 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -7816,6 +7816,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) > vcpu->arch.regs_avail = ~0; > vcpu->arch.regs_dirty = ~0; > > + vcpu->arch.xcr0 = XFEATURE_MASK_FP; > + > kvm_x86_ops->vcpu_reset(vcpu, init_event); > } > > -- > 2.7.4 >
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