Hello, On Fri, Sep 29, 2023 at 8:29 PM Jim Mattson <jmattson@xxxxxxxxxx> wrote: > For things to work well in the "vPMU as a client of host perf" world, > we need to have the following at a minimum: > 1) Guaranteed identity mapping of guest PMCs to host PMCs, so that we > don't have to intercept accesses to IA32_PERF_GLOBAL_CTRL. > 2) Exclusive ownership of the PMU MSRs while in the KVM_RUN loop, so > that we don't have to switch any PMU MSRs on VM-entry/VM-exit (with > the exception of IA32_PERF_GLOBAL_CTRL, which has guest and host > fields in the VMCS). IIUC that means multiplexing should be handled in the guest. Not sure it can support mixing host and guest events at the same time. Thanks, Namhyung
