On Wed, Aug 13, 2025 David Woodhouse <dwmw2@xxxxxxxxxxxxx> wrote: > > On Wed, 2025-08-13 at 17:30 +0800, hugo lee wrote: > > > > Sorry for the misleading, what I was going to say is > > do only cpu_synchroniza_state() in this new userspace exit reason > > and do nothing on the PIT. > > So QEMU will ignore the PIT as the guests do. > > > > The resample is great and needed, but the synchronization > > makes more sense to me on this question. > > So if the guest doesn't actually quiesce the PIT, QEMU will *still* > keep waking up to waggle the PIT output pin, it's just that QEMU won't > bother telling the kernel about it? Yes, just as guests wish. This could eliminate the most performance loss. But I guess resample is more acceptable.
