On Fri, Nov 11, 2022, Like Xu wrote: > From: Like Xu <likexu@xxxxxxxxxxx> > > Although when !enable_pmu, KVM will have zero-padded kvm_pmu_cap to do > subsequent cpuid leaf assignments, one extra branch instruction saves > a few subsequent zero-assignment instructions, speeding things up a bit. I doubt my motivation was performance, I'm guessing I suggested adding the explicit !enable_pmu check because relying on kvm_pmu_cap to be zeroed isn't obvious.
