[libvirt-users] libvirt guests graceful shutdown upon hosts powerdown/reboot

hi everybody by an assumption I expected VM guests to be shut down/off gracefully when the host is being powered down or rebooted, but this does not seem to be the case so I wonder.. Am I missing some libvirt components/packages ? Or my assumption is incorrect and guests have to be shutdown manually? it's all SL 7 and guest are M$ regards P.