lkml.org 
[lkml]   [2014]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: KVM causes #GP on XRSTORS
Hi Paolo,
On Fri, Nov 21, 2014 at 03:46:55PM +0100, Paolo Bonzini wrote:
>
>
>On 20/11/2014 17:34, Nadav Amit wrote:
>> Fenghua,
>>
>> I got KVM (v3.17) crashing on a machine that supports XRSTORS - It appears to get a #GP when it is trying to load the guest FPU.
>> One reason for the #GP is that XCOMP_BV[63] is zeroed on the guest_fpu, but I am not sure it is the only problem.
>> Was KVM ever tested with XRSTORS?
>
>What is the content of the CPUID[EAX=13,ECX=0] and CPUID[EAX=13,ECX=1]
>leaves on the host?
>
>Fenghua, which processors have XSAVEC, which have XGETBV with ECX=1, and
>which have XSAVES? We need to expose this in QEMU, for which I can send

Skylake-client supports XSAVES.

>a patch later today or next week (CCing Eduardo for this).

Actually I do the xsaves work in kvm/qemu recently and the patches are
complete, I will start to test it before send out.

Regards,
Wanpeng Li

>
>We will also have to uncompact the XSAVE area either in KVM_GET_XSAVE or
>in QEMU. It's probably not hard to do it in the kernel.
>
>Paolo
>--
>To unsubscribe from this list: send the line "unsubscribe kvm" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at http://vger.kernel.org/majordomo-info.html


\
 
 \ /
  Last update: 2014-11-24 04:01    [W:0.027 / U:0.808 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site