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

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Message-ID: <49BDA415.9060502@zytor.com>
Date:	Sun, 15 Mar 2009 17:57:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 10/24] xen: mask XSAVE from cpuid

Arjan van de Ven wrote:
> 
> Well.. pretty much all new instructions need Xen modifications due to
> the need to be emulate to deal with traps/vmexits/etc right? 
> So I don't quite see many cpuid bits that would NOT involve some Xen
> modification or another ;)
> 

There are going to be a very small number which need only userspace
support.  However, there will be absolutely no way for Xen to know this
a priori.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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