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RE: [Xen-devel] [PATCH 3/3 v2] XSAVE/XRSTOR: enable guest AVX

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 3/3 v2] XSAVE/XRSTOR: enable guest AVX
From: "Li, Xin" <xin.li@xxxxxxxxx>
Date: Wed, 1 Sep 2010 22:22:43 +0800
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Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
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Thread-topic: [Xen-devel] [PATCH 3/3 v2] XSAVE/XRSTOR: enable guest AVX
> On Tue, Aug 31, 2010 at 10:52:38PM +0800, Han, Weidong wrote:
> > This patch enables Intel(R) Advanced Vector Extension (AVX) for guest.
> I thought that this would also work on the AMD Bulldozer's CPUs? Or is the
> Intel AVX incompatible with AMD AVX?

The code just checks if a feature is available thru CPUID before using, no 
matter it's Intel CPU or AMD.

There are 2 approaches to provide a new feature, use a compatible way the other 
side is using thus reuse the code/binary, or a complete new way.  There are 
many examples you can find in Linux/Xen code.

AMD people can comment if they will implement the AVX like feature.  If yes, if 
it's in a software compatible way or totally new.


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