RE: [Xen-devel] [PATCH][SVM] remove FFXSR CPUID bit for AMD-V HVM guests

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Jan Beulich
> Sent: 01 February 2007 08:20
> To: Woller, Thomas
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH][SVM] remove FFXSR CPUID bit 
> for AMD-V HVM guests
> 
> >>> "Woller, Thomas" <thomas.woller@xxxxxxx> 01.02.07 00:06 >>>
> >Remove visibility of the FFXSR CPUID bit to an HVM guest.
> >This patch allows HVM Windows x64 to install/boot on AMD-V platforms.
> 
> Would you mind explaining why this is necessary? (Similarly I 
> have a hard
> time understanding why 3dnow can't be allowed for hvm guests.)

I don't know why FFXSR shouldn't be allowed... 

3Dnow! should be allowed in the guest, however, MMIO from SSE/3Dnow!/MMX
instructions would fail - but that's no reason to disallow 3DNow!

--
Mats
> 
> Jan
> 
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