Start up a postcopy/listener thread ready for incoming page data
The loading of a device state (during postcopy) may access guest memory that's still on the source machine and thus might need a page fill; split off a separate thread that handles the incoming page data so that the original incoming migration code can finish off the device data. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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