[libvirt] Lifecycle events during reboot for KVM and Xen

Hi, during debugging a problem[1] of Openstack Nova I recognized the following: Doing a reboot (from inside of the VM with "reboot" command) on a kvm VM doesn't send any lifecycle events (events debugged with [2]). Doing the same thing with a xen VM leads to 2 events: First a VIR_DOMAIN_EVENT_STOPPED and then a VIR_DOMAIN_EVENT_STARTED event. The problem here is that for the xen case it doesn't seem to be possible to recognize that a reboot is ongoing. For that reason the OpenStack Nova component just forces the domain to stop after receiving the VIR_DOMAIN_EVENT_STOPPED event. Is it expected that the 2 drivers send different events for the same action or a bug in qemu/xen/libvirt? Cheers, Tom [1] https://bugs.launchpad.net/nova/+bug/1293480 [2] https://gist.github.com/toabctl/53f26989ad7634a3168b