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I'm trying to make live migration work in an environment with Xen and
Libvirt, but I found some issues.

The first one I managed to "correct", but it really looks like a bug. The
live migration command will fail and the logs will indicate
"InstanceNotRunning". That's because when a xen virtual machine is not using
the processor, its status is "blocked". I "corrected" it by sending the
instance in an infinite CPU loop and waiting for nova-compute to update the
DB with the status "running". I don't know how these status are handled by
KVM, but at least the migration check should take that in consideration if
it plans to work with xen.

The second one is a little more complicated and I haven't found a solution
yet, so you may help me with it. After making the vm "running" the live
migration just fails and the logs rise an error "Cannot find "'model'". Is
there any configuration that is related to this?

trace from nova-manage.log:

(nova): TRACE: Traceback (most recent call last):
(nova): TRACE:   File "/usr/bin/nova-manage", line 2141, in <module>
(nova): TRACE:     main()
(nova): TRACE:   File "/usr/bin/nova-manage", line 2129, in main
(nova): TRACE:     fn(*fn_args, **fn_kwargs)
(nova): TRACE:   File "/usr/bin/nova-manage", line 987, in live_migration
(nova): TRACE:     self._migration(ec2_id, dest)
(nova): TRACE:   File "/usr/bin/nova-manage", line 976, in _migration
(nova): TRACE:     "block_migration": block_migration}})
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/__init__.py",
line 45, in call
(nova): TRACE:     return get_impl().call(context, topic, msg)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/impl_kombu.py",
line 739, in call
(nova): TRACE:     rv = list(rv)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/impl_kombu.py",
line 703, in __iter__
(nova): TRACE:     raise result
(nova): TRACE: RemoteError: RemoteError Error cannot find 'model'
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