>>> On 24.02.16 at 11:33, wrote:
>> From: Tian, Kevin
>> Sent: Thursday, February 18, 2016 2:31 PM
>>
>> >
>> > > If the VCPU is descheduled between these two checks, the contents of
>> > > FCS/FDS is lost, Windows will notice and BugCheck.
>> > >
>> > > When saving a VCPUs FPU state, Xen first
> From: Tian, Kevin
> Sent: Thursday, February 18, 2016 2:31 PM
>
> >
> > > If the VCPU is descheduled between these two checks, the contents of
> > > FCS/FDS is lost, Windows will notice and BugCheck.
> > >
> > > When saving a VCPUs FPU state, Xen first uses a REX.W prefixed XSAVE and
> > > notic
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: 18 February 2016 09:24
> To: Paul Durrant
> Cc: Andrew Cooper; David Vrabel; Feng Wu; Kevin Tian; xen-devel
> Subject: RE: Restoring FPU exception state
>
> >>> On 18.02.16 at 09:54, wrote:
> >> -Original Mes
>>> On 18.02.16 at 09:54, wrote:
>> -Original Message-
>> From: Jan Beulich [mailto:jbeul...@suse.com]
>> Sent: 18 February 2016 08:50
>> To: Paul Durrant; Kevin Tian
>> Cc: Andrew Cooper; David Vrabel; Feng Wu; xen-devel
>> Subject: RE: Restoring FPU exception state
>>
>> >>> On 18.02.1
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: 18 February 2016 08:50
> To: Paul Durrant; Kevin Tian
> Cc: Andrew Cooper; David Vrabel; Feng Wu; xen-devel
> Subject: RE: Restoring FPU exception state
>
> >>> On 18.02.16 at 09:41, wrote:
> >> -Original Mes
>>> On 18.02.16 at 09:41, wrote:
>> -Original Message-
>> From: Jan Beulich [mailto:jbeul...@suse.com]
>> Sent: 18 February 2016 08:16
>> To: Kevin Tian
>> Cc: Andrew Cooper; David Vrabel; Paul Durrant; Feng Wu; xen-devel
>> Subject: RE: Restoring FPU exception state
>>
>> >>> On 18.02.1
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: 18 February 2016 08:16
> To: Kevin Tian
> Cc: Andrew Cooper; David Vrabel; Paul Durrant; Feng Wu; xen-devel
> Subject: RE: Restoring FPU exception state
>
> >>> On 18.02.16 at 07:30, wrote:
> > Interesting. Let me
>>> On 18.02.16 at 07:30, wrote:
> Interesting. Let me also have a check internally whether there is other
> architectural alternative. BTW, not quite related. Could I think finally
> Xen may allow user to specify OS type as a general per-domain control,
> and then Xen can do free optimizations un
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: Wednesday, February 17, 2016 9:46 PM
>
> >>> On 17.02.16 at 14:08, wrote:
> > The FPU exception state includes 4 registers:
> >
> > - 64-bit FIP
> > - 16-bit FCS
> > - 64-bit FDP
> > - 16-bit FDS
> >
> > When a CPU takes an FPU exception in l
>>> On 17.02.16 at 14:08, wrote:
> The FPU exception state includes 4 registers:
>
> - 64-bit FIP
> - 16-bit FCS
> - 64-bit FDP
> - 16-bit FDS
>
> When a CPU takes an FPU exception in long mode, all 4 registers are
> fully updated. This state can be saved with a combination of REX.W
> prefixed
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