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[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


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