Il 03/02/2014 15:28, Peter Zijlstra ha scritto:
> > 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?
On Intel nothing, the MSRs always returns 0.
AMD did add LBR virtualization to its virtualization exception, so on
AMD you can use LBR from a guest.
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
