Re: KVM causes #GP on XRSTORS
From: Wanpeng Li
Date: Sun Nov 23 2014 - 21:26:24 EST
On Fri, Nov 21, 2014 at 03:46:55PM +0100, Paolo Bonzini wrote:
>On 20/11/2014 17:34, Nadav Amit wrote:
>> 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 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.
>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.
>To unsubscribe from this list: send the line "unsubscribe kvm" in
>the body of a message to majordomo@xxxxxxxxxxxxxxx
>More majordomo info at http://vger.kernel.org/majordomo-info.html
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/