lkml.org 
[lkml]   [2017]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH 2/2] KVM: X86: XCR0 should be set to the fixed value on vCPU reset
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
>

\
 
 \ /
  Last update: 2017-10-09 00:37    [W:0.601 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site