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Live migration, state save/resume, and hotplug are not trivial when it comes to virtio-net devices backed by externally provided FDs. As the mechanism behind it can be considered as quite "multi-step magic" even for experienced programmers, it makes sense to thoroughly document this to ease debugging and to improve the mental model of developers working on this in the future. Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de> On-behalf-of: SAP philipp.schuster@sap.com