KVM: x86: Explicitly zero cpuid "0xa" leaf when PMU is disabled On Tue, Feb 14, 2023, Like Xu wrote: > From: Like Xu <likexu@xxxxxxxxxxx> > > Add an explicit !enable_pmu check as relying on kvm_pmu_cap to be > zeroed isn't obvious. 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. Drop the performance blurb, as I stated multiple times, optimizing this code is a non-goal.
