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Re: [Xen-devel] [Patch 2/4] Refining Xsave/Xrestore support
| To: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [Patch 2/4] Refining Xsave/Xrestore support |
| From: | Haitao Shan <maillists.shan@xxxxxxxxx> |
| Date: | Thu, 28 Oct 2010 10:57:15 +0800 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, "Han, Weidong" <weidong.han@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Wed, 27 Oct 2010 19:58:09 -0700 |
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Hi, Jeremy, My approach is based an old PV-OPS kernel source. Kernel tries to set CR4.OSXSAVE and read it back to determine whether Xsave is actually available. Could you still use that? Shan Haitao 2010/10/28 Jeremy Fitzhardinge <jeremy@xxxxxxxx>: > On 10/27/2010 12:04 AM, Haitao Shan wrote: >> Hi, Keir, >> >> This is patch #2, which adds PV guest Xsave support. > > How does a PV guest know whether Xsave support is available? Previous > versions of Xen left the xsave cpu feature flag set even though xsave > wasn't usable by the domain, so I had to forceably mask it from the > cpuid features within the domain. Given that a PV domain can't rely on > X86_FEATURE_XSAVE, how can it tell that the feature is actually usable? > > Thanks, > J > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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