> > Is there any event in the host still having PERF_EVENT_STATE_ACTIVE? > > If so, hmm, it will reach perf_pmu_disable(event->pmu), which will > > access the global ctrl MSR. > > I don't think there is any event with PERF_EVENT_STATE_ACTIVE state on > host when guest owns the PMU HW resource. > > In current solution, VM would fail to create if there is any system-wide > event without exclude_guest attribute. If VM is created successfully and > when vm-entry happens, the helper perf_guest_enter() would put all host > events with exclude_guest attribute into PERF_EVENT_STATE_INACTIVE state > and block host to create system-wide events without exclude_guest attribute. > Yeah, that's perfect. Thanks. -Mingwei
