Jim, I agree. It seems inevitable that the demands on the vPMU will continue to grow. On the current path, we will keep adding complexity to perf until it essentially has a raw MSR interface used by KVM. Your proposal gives a clean separation where KVM notifies perf when the PMC will stop counting. That handles both vPMU and TDX. And it allows KVM to provide the full expressiveness to guests. Dave Dunn On Wed, Feb 2, 2022 at 2:35 PM Jim Mattson <jmattson@xxxxxxxxxx> wrote: > Given what's coming with TDX, I wonder if we should just bite the > bullet and cede the PMU to the guest while it's running, even for > non-TDX guests. That would solve (1) and (2) as well.
