Messages in this thread | | | Subject | Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guest os statistics collection in guest os | From | Peter Zijlstra <> | Date | Tue, 22 Jun 2010 12:10:28 +0200 |
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On Tue, 2010-06-22 at 13:06 +0300, Avi Kivity wrote:
> You have a set of MSRs for real hardware (actually several sets) > discoverable by cpuid bits. You have another set of MSRs, using other > indexes, discoverable by more CPUID bits. > > The new MSR indexes will always #GP on real hardware, but will be > trapped and serviced by kvm. In effect kvm will pretend to have a > hardware-like PMU but done according to its own specifications.
So what's the point? I thought the whole MSR interface thing was purely to let other-o$ play with the PMU, but if you move it around like that and make it KVM specific, nobody will find it...
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