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When libvirt is managing a bridge's forwarding database (FDB) (macTableManager='libvirt'), if we add FDB entries for a new guest interface even before the qemu process is created, then in the case of a migration any other guest attached to the "destination" bridge will have its traffic immediately sent to the destination of the migration even while the source domain is still running (and the destination, of course, isn't). To make sure that traffic from other guests on the new host continues flowing to the old guest until the new one is ready, we have to wait until the new guest CPUs are started to add the FDB entries. Conversely, we need to remove the FDB entries from the bridge any time the guest CPUs are stopped; among other things, this will assure proper operation during a post-copy migration (which is just the opposite of the problem described in the previous paragraph).
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>