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[Boris Filippov <bfilippov@xxxxxxxxxxxxxxxx>]

Well, according to
http://libvirt.org/html/libvirt-libvirt.html#virDomainManagedSave
domain will be suspended.
After snapshotting there is new _create_domain call:

        if state == power_state.RUNNING:
            virt_dom.managedSave(0)

... snapshotting...

            finally:
                libvirt_utils.delete_snapshot(disk_path, snapshot_name)
                if state == power_state.RUNNING:
                    self._create_domain(domain=virt_dom)

So, Is this actually "live" snapshot right now?

>> But qemu can also write the vm state outside of the backend image, which
>> should be usable with all image backends.

This can be exploited for saving VM states. There is blueprint for that:
https://blueprints.launchpad.net/nova/+spec/live-snapshots