Messages in this thread | | | Date | Fri, 14 Mar 2014 09:17:45 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU. |
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> The Intel ISR section for RDMSR seems to say: "Specifying a reserved > or unimplemented > MSR address in ECX will also cause a general protection exception". > > From a guest's perspective, MSR_RAPL_POWER_UNIT is unimplemented; kvm matches > this behavior.
MSRs are model specific and defined per model number. If you report a model number you're expected to implement the MSRs defined for that model number.
AFAIK Xen just reports 0 for unknown MSRs (and I'm surprised KVM doesn't too)
I would suggest to fix KVM.
-Andi
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