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Address Space IDs allows the VDUSE framework to support devices able to expose different virtqueues to different part of the drivers. For example, to let QEMU handle the net device control virtqueue, so QEMU always knows the state of the device like mac address or number of queues enabled, while leaving the dataplane passthrough to the guest intact. This enables live migration. Expands the VDUSE documentation to explain how to use the new ioctls or the new struct members of old ioctls. Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20260119143306.1818855-14-eperezma@redhat.com>