Extending virtio_console to support multiple ports

[Alan Cox]

>  - Then, are we certain that there's no case where the tty layer will
> call us with some lock held or in an atomic context ? To be honest,
> I've totally lost track of the locking rules in tty land lately so it
> might well be ok, but something to verify.

Some of the less well behaved line disciplines do this and always have
done.

Alan