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Re: [Xen-devel] VMX: emulated guest use SYSENTER MSRs
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] VMX: emulated guest use SYSENTER MSRs |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Fri, 06 Jul 2007 13:52:37 +0100 |
| Delivery-date: | Fri, 06 Jul 2007 05:50:45 -0700 |
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| Thread-topic: | [Xen-devel] VMX: emulated guest use SYSENTER MSRs |
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Probably because the existing code must remain anyway (since not all VMX CPUs support the MSR bitmap), and the benefit of avoiding the intercepts on CPUs that do support it would have entirely negligible performance benefit, since the MSRs are written only at start of day. We could add calls to avoid the intercepts anyway though, if you want to provide a patch. -- Keir On 6/7/07 13:41, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > What is the reason for not simply clearing the MSR bitmap bits for these three > MSRs, and rather handling the reads/writes in software? > > Jan > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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