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Re: [Xen-devel] [Patch] Allowing PV-OPS kernel to detect whether XSAVE i

from [Jan Beulich] [Permanent Link][Original]
To: "Ian Campbell" <Ian.Campbell@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [Patch] Allowing PV-OPS kernel to detect whether XSAVE is supported
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 09 Nov 2010 11:26:31 +0000
Cc: Haitao Shan <maillists.shan@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
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>>> On 09.11.10 at 11:54, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:
> So if OSXSAVE is enabled we can also infer that XSAVE is safe to use,
> because XSAVE was fixed/implemented before OSXSAVE was? Seems
> reasonable.

Yes, that's my understanding (prior to the recent changes, CR4.OSXSAVE
got turned on only in HVM context if I followed things correctly).

Jan


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