def resume_state_on_host_boot(self, context, instance, network_info,
                                  block_device_info=None):
        self._vmops.power_on(instance)
resume guest state when a host is booted.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/virt/xenapi/driver.py/XenAPIDriver.resume_state_on_host_boot