On Mon, Feb 03, 2014 at 03:26:42PM +0100, Peter Zijlstra wrote: > On Mon, Feb 03, 2014 at 03:19:18PM +0100, Paolo Bonzini wrote: > > Il 03/02/2014 15:12, Peter Zijlstra ha scritto: > > >>> But why doesn't it crash on baremetal? > > >>> Probably baremetal simply returns 0 or something. > > >>> Let me try .. > > >The claim "v2 and above have FEATURE_PDCM" is in fact true for real > > >hardware. > > > > > >If it didn't the rdmsr() would have generated an exception and we'd have > > >crashed just like your virtual thingy did. > > > > Right, and the virt thingy has no PEBS, so there is no correct value that we > > could return from the MSR. That's why the CPUID bit is zero. > > There's more than PEBS in there, there's also the LBR format (which you > obviously also don't have) On that.. LBR is purely model based, what do you guys do with those MSRs? -- 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
