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Re: [Xen-devel] [PATCH 2/2] hvm: allow pass-through of new CPUID feature
| To: | Andre Przywara <andre.przywara@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 2/2] hvm: allow pass-through of new CPUID features |
| From: | Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
| Date: | Wed, 26 Jan 2011 16:05:54 +0000 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx> |
| Delivery-date: | Wed, 26 Jan 2011 08:07:47 -0800 |
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Andre Przywara writes ("[Xen-devel] [PATCH 2/2] hvm: allow pass-through of new
CPUID features"):
> there are some new CPUID features that are safe for guests to see, as
> they don't require OS awareness (FPU/ALU related instructions only).
> Among features for new AMD CPUs there is also the PCLMULQDQ bit, which
> Intel CPU have already for quite a while.
This would seem to be a new feature. We are currently in feature
freeze.
Can you make a justification for a freeze exception ?
Ian.
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