On Fri, Aug 25, 2017 at 02:30:33PM +1000, 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 <npiggin@xxxxxxxxx> Some of the feature sections seem a little unnecessary except for documentation purposes (e.g. the second one added after the kvm_no_guest label), but they won't actually hurt, so: Acked-by: Paul Mackerras <paulus@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
