'resume the specified instance.'

def resume(self, context, instance, network_info, block_device_info=None):

    xml = self._get_existing_domain_xml(instance, network_info, block_device_info)
    guest = self._create_domain_and_network(context, xml, instance, network_info, block_device_info=block_device_info, vifs_already_plugged=True)
    self._attach_pci_devices(guest, pci_manager.get_instance_pci_devs(instance))
    self._attach_direct_passthrough_ports(context, instance, guest, network_info)
    timer = loopingcall.FixedIntervalLoopingCall(self._wait_for_running, instance)
    timer.start(interval=0.5).wait()
    guest.sync_guest_time()
