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

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Message-ID: <20090317104817.GO11935@one.firstfloor.org>
Date:	Tue, 17 Mar 2009 11:48:17 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH 10/24] xen: mask XSAVE from cpuid

> 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?

-Andi
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