On 14/10/2015 13:26, Jian Zhou wrote: > On 12/10/2015 20:44, Paolo Bonzini wrote: >> In addition, the MSR numbers may differ between the guest and the host, >> because it is possible to emulate e.g. a Core CPU on a Core 2 CPU. So I >> recommend against using the atomic switch mechanism for the from/to MSRs. > > The vLBR feature depends on vPMU, and to enable vPMU, it needs to > specify the "cpu mode" in the guest XML as host-passthrough. I think > the MSR numbers between the guest and the host are the same in this > senario. Does it depend on vPMU _for Linux guests_ or in general? My impression is that LBR can be used by the guest independent of the PMU. You should also write a unit test for kvm-unit-tests to test the behavior of your implementation. Thanks, 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
