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[Xen-devel] Re: [PATCH] xen: mask XSAVE in cpuid since we don't allow gu
| To: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] xen: mask XSAVE in cpuid since we don't allow guests to use it |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Sun, 08 Mar 2009 09:13:16 +0000 |
| Cc: | Boris Derzhavets <bderzhavets@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Marc - A. Dahlhaus \[ Administration | Westermann GmbH \]" <mad@xxxxxx> |
| Delivery-date: | Sun, 08 Mar 2009 01:13:50 -0800 |
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| Thread-topic: | [PATCH] xen: mask XSAVE in cpuid since we don't allow guests to use it |
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On 08/03/2009 05:31, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote: > Mask X86_FEATURE_XSAVE in cpuid leaf 1, ecx, as we don't allow guests to > use it (by setting cr4.OSXSAVE). > > This prevents crashes in pvops dom0 kernels, as new versions of Linux try > to use this feature. > > (This patch deals with dom0 cpuid; I'm not sure where the right place to > set up the default mask for domU is.) Thanks, the whole problem stems from blacklisting rather than whitelisting feature bits. I might try and do a more comprehensive job for xen-unstable at least. This is good for 3.3. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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