* Joerg Roedel <joro@xxxxxxxxxx> wrote: > I personally don't like a self-defined event-set as the only solution > because that would probably only work with linux and perf. [...] The 'soft-PMU' i suggested is transparent on the guest side - if you want to enable non-Linux and legacy-Linux. It's basically a PMU interface provided to the guest by catching the right MSR accesses, implemented via perf_event_create_kernel_counter()/etc. on the host side. Note that the 'soft PMU' still sucks from a design POV as there's no generic hw interface to the PMU. So there would have to be a 'soft AMD' and a 'soft Intel' PMU driver at minimum. Far cleaner would be to expose it via hypercalls to guest OSs that are interested in instrumentation. That way it could also transparently integrate with tracing, probes, etc. It would also be wiser to first concentrate on improving Linux<->Linux guest/host combos before gutting the design just to fit Windows into the picture ... Ingo -- 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
