COLO: quick failover process by kick COLO thread
COLO thread may sleep at qemu_sem_wait(&s->colo_checkpoint_sem), while failover works begin, It's better to wakeup it to quick the process. Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: NJason Wang <jasowang@redhat.com>
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