On Tue, Oct 31, 2023 at 1:58 AM Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx> wrote: > > This patch adds support for the architectural topdown slots event which > is hinted by CPUID.0AH.EBX. Can't a guest already program an event selector to count event select 0xa4, unit mask 1, unless the event is prohibited by KVM_SET_PMU_EVENT_FILTER? AFAICT, this change just enables event filtering based on CPUID.0AH:EBX[bit 7] (though it's not clear to me why two independent mechanisms are necessary for event filtering).
