Il 03/02/2014 15:06, Michael S. Tsirkin ha scritto:
Linux seems to be trying to read IA32_PERF_CAPABILITIES without checking the PDCM flag (CPUID[1].ECX[15]). I can't see why this wasn't crashing before, though. That code seems to be old. * v2 and above have a perf capabilities MSR */ if (version > 1) { u64 capabilities; rdmsrl(MSR_IA32_PERF_CAPABILITIES, capabilities); x86_pmu.intel_cap.capabilities = capabilities; } Where does the "v2 and above have a perf capabilities MSR" claim in the code come from?But why doesn't it crash on baremetal? Probably baremetal simply returns 0 or something. Let me try ..
Because KVM doesn't implement the MSR, but your baremetal likely does. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
