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Re: [Xen-devel] [PATCH] xen: mask XSAVE in cpuid since we don't allowgu
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, 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 11:29:15 +0000 |
| Cc: | Boris Derzhavets <bderzhavets@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Marc - A. Dahlhaus \[ Administration | Westermann GmbH \]" <mad@xxxxxx> |
| Delivery-date: | Mon, 09 Mar 2009 04:30:12 -0700 |
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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 11:26, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >>>> Jeremy Fitzhardinge <jeremy@xxxxxxxx> 08.03.09 06:31 >>> >> Mask X86_FEATURE_XSAVE in cpuid leaf 1, ecx, as we don't allow guests to >> use it (by setting cr4.OSXSAVE). > > I actually disagree to this. The kernel should be dealing with the situation > by inspecting the OSXSAVE bit in CPUID when running under Xen, since it's > really Xen that's the 'OS' for that particular feature. > > Then, once Keir gets willing to take Intel xsave patch(es), no further change > is going to be needed here. And the same kernel will work (assuming it has > no other dependencies) on older Xen not having this bit masked. It seems reasonable to mask XSAVE for now though. I don't think it can usefully be used without some Xen support. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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