lock for migration
===
kvm_for_each_vcpu(i, vcpu, kvm) {
if (mutex_lock_killable(&vcpu->mutex))
goto out_unlock;
lockdep_copy_map(&vcpu->v_dep_map, &vcpu->mutex.dep_map);
mutex_release(&vcpu->mutex.dep_map, ip);
}
unlock for migration
===
kvm_for_each_vcpu(i, vcpu, kvm) {
lockdep_copy_map(&vcpu->mutex.dep_map, &vcpu->v_dep_map);
/*
* Or directly acquire without v_dep_map added
*
mutex_acquire(&vcpu->mutex.dep_map, 0, 1,_RET_IP_);
*/
mutex_unlock(&vcpu->mutex);
}