linux-kernel - Re: KVM causes #GP on XRSTORS

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Message-ID: <20141121001033.GA10834@kernel>
Date:	Fri, 21 Nov 2014 08:10:33 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	Nadav Amit <nadav.amit@...il.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, fenghua.yu@...el.com,
	kvm list <kvm@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: KVM causes #GP on XRSTORS

Hi Nadav,
On Thu, Nov 20, 2014 at 06:34:04PM +0200, 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?

Current kvm and qemu use standard format and xsaves/xrstors should use
compact format, in addition, vmx is still not enabled for xsaves/xrstors 
in kvm.

Regards,
Wanpeng Li 

>
>Thanks,
>Nadav
>
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