Nicholas Piggin <npiggin@xxxxxxxxx> writes: > 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> > --- > arch/powerpc/include/asm/kvm_book3s_asm.h | 4 ++++ > arch/powerpc/kernel/idle_book3s.S | 35 +++++++++++++++++++++---------- > arch/powerpc/kvm/book3s_hv.c | 14 ++++++++++++- > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +++++++ > 4 files changed, 49 insertions(+), 12 deletions(-) Paulus do you mind acking this and I'll put it in my ppc-kvm topic branch. cheers -- 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
