virtio: console: Handle port hot-plug
If the 'nr_ports' variable in the config space is updated to a higher value, that means new ports have been hotplugged. Introduce a new workqueue to handle such updates and create new ports. Signed-off-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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