Interrupts can't wake such CPUs up. SIGP from other CPUs has to be used
to toggle the state.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-7-david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>