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Re: [Xen-devel] [PATCH] xen: mask XSAVE in cpuid since we don't allowgu

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] xen: mask XSAVE in cpuid since we don't allowguests to use it
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 09 Mar 2009 17:54:21 +0000
Cc: Boris Derzhavets <bderzhavets@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Marc - A. Dahlhaus \[ Administration | Westermann GmbH \]" <mad@xxxxxx>
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Thread-topic: [Xen-devel] [PATCH] xen: mask XSAVE in cpuid since we don't allowguests to use it
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On 09/03/2009 16:40, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

> Keir Fraser wrote:
>> It seems reasonable to mask XSAVE for now though. I don't think it can
>> usefully be used without some Xen support.
> You mean Xen support to deal with a new CPU context structure, or
> something requiring specific guest code, like what's needed to support
> sysenter/syscall?

I mean it indicates new CPU context requiring context switching. But, fully
generally, who knows? :-)

 -- Keir

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