lkml.org 
[lkml]   [2017]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] KVM: x86: Fix load damaged SSEx MXCSR register
From
Date


On 10/05/2017 12:19, Wanpeng Li wrote:
> * with old userspace.
> */
> - if (xstate_bv & ~kvm_supported_xcr0())
> + if (xstate_bv & ~kvm_supported_xcr0() ||
> + mxcsr & ~vcpu->arch.guest_fpu.state.xsave.i387.mxcsr_mask)
> return -EINVAL;
> load_xsave(vcpu, (u8 *)guest_xsave->region);
> } else {
> - if (xstate_bv & ~XFEATURE_MASK_FPSSE)
> + if (xstate_bv & ~XFEATURE_MASK_FPSSE ||
> + mxcsr & ~vcpu->arch.guest_fpu.state.fxsave.mxcsr_mask)
> return -EINVAL;
> memcpy(&vcpu->arch.guest_fpu.state.fxsave,
> guest_xsave->region, sizeof(struct fxregs_state));

Hmm, thinking more about it, maybe use mxcsr_feature_mask instead of
digging into vcpu->arch.guest_fpu? If you send v2, please remember to
Cc stable@vger.kernel.org.

Paolo

\
 
 \ /
  Last update: 2017-05-10 21:22    [W:0.057 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site