On Fri, 2017-08-25 at 04:30:33 UTC, Nicholas Piggin wrote: > POWER9 CPUs have independent MMU contexts per thread, so KVM does not > need to quiesce secondary threads, so the hwthread_req/hwthread_state > protocol does not have to be used. So patch it away on POWER9, and patch > away the branch from the Linux idle wakeup to kvm_start_guest that is > never used. > > Add a warning and error out of kvmppc_grab_hwthread in case it is ever > called on POWER9. > > This avoids a hwsync in the idle wakeup path on POWER9. > > Signed-off-by: Nicholas Piggin <npig...@gmail.com> > Acked-by: Paul Mackerras <pau...@ozlabs.org>
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/94a04bc25a2c6296bd0c5e82c10e82 cheers
