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Re: [Xen-devel] [PATCH 10/24] xen: mask XSAVE from cpuid

To: "Andi Kleen" <andi@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 10/24] xen: mask XSAVE from cpuid
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
Date: Tue, 17 Mar 2009 10:55:35 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>
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>>> Andi Kleen <andi@xxxxxxxxxxxxxx> 17.03.09 11:48 >>>
>> No, properly coded xsave support will (hopefully) make user-visible context
>> extensions transparent to hypervisor and OS. But I was giving a general
>> example here, and the change from xmm to ymm registers is one that does
>> need hypervisor (and OS) changes.
>Again except for XSAVE support it doesn't, does it?

No, it shouldn't (minus the valid comments hpa added in another reply).


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