Re: [PATCH] kvm/fpu: Enable fully eager restore kvm FPU

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On 08/23/2012 11:51 AM, Hao, Xudong wrote:
>> -----Original Message-----
>> From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On
>> Behalf Of Avi Kivity
>> Sent: Monday, August 20, 2012 6:43 PM
>> To: Roedel, Joerg
>> Cc: Hao, Xudong; kvm@xxxxxxxxxxxxxxx; Zhang, Xiantao
>> Subject: Re: [PATCH] kvm/fpu: Enable fully eager restore kvm FPU
>> 
>> On 08/20/2012 01:14 PM, Roedel, Joerg wrote:
>> > On Mon, Aug 20, 2012 at 01:08:14PM +0300, Avi Kivity wrote:
>> >> On 08/20/2012 12:24 PM, Roedel, Joerg wrote:
>> >
>> >> So it was broken all along?  Yikes.
>> >
>> > There is no LWP support in the kernel and thus KVM can't expose it to
>> > guests. So for now nothing should be broken, no?
>> 
>> Oh, we mask out xcr0 bits not supported by the host.
>> 
>> So it's broken in another way: it isn't exposed.  Pity, it's such a nice
>> feature.
>> 
> 
> Hi, Avi/Joerg
> 
> What's the decision for it? I don't understand LWP, so how about this patch? 

It's fine (Joerg can send the LWP change), but there was a truncation
issue that needs fixing, no?


-- 
error compiling committee.c: too many arguments to function
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