linux-kernel - Re: [CFT PATCH 0/2] KVM: support XSAVES usage in the host

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Date:	Sun, 23 Nov 2014 16:24:19 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Nadav Amit <nadav.amit@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
Subject: Re: [CFT PATCH 0/2] KVM: support XSAVES usage in the host

Hi Nadav,
On 11/23/14, 4:16 PM, Nadav Amit wrote:
> I’ll try to check it tomorrow (I don’t have access to the failing machine at the moment).

If the machine you mentioned support xsaves and what's machine you are 
using?

Regards,
Wanpeng Li

>
> Thanks for the quick response.
>
> Nadav
>
>> On Nov 21, 2014, at 20:31, Paolo Bonzini <pbonzini@...hat.com> wrote:
>>
>> The first patch ensures that XSAVES is not exposed in the guest until
>> we emulate MSR_IA32_XSS.  The second exports XSAVE data in the correct
>> format.
>>
>> I tested these on a non-XSAVES system so they should not be completely
>> broken, but I need some help.  I am not even sure which XSAVE states
>> are _not_ enabled, and thus compacted, in Linux.
>>
>> Note that these patches do not add support for XSAVES in the guest yet,
>> since MSR_IA32_XSS is not emulated.
>>
>> If they fix the bug Nadav reported, I'll add Reported-by and commit.
>>
>> Thanks,
>>
>> Paolo
>>
>> Paolo Bonzini (2):
>>   kvm: x86: mask out XSAVES
>>   KVM: x86: support XSAVES usage in the host
>>
>> arch/x86/kvm/cpuid.c | 11 ++++++++++-
>> arch/x86/kvm/x86.c   | 48 +++++++++++++++++++++++++++++++++++++++++++-----
>> 2 files changed, 53 insertions(+), 6 deletions(-)
>>
>> -- 
>> 1.8.3.1
>>
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