Re: [Qemu-devel] [PATCH 3/6] virtio-console: Add a virtio-console bus, support for multiple ports

[Gerd Hoffmann <kraxel@redhat.com>]

   Hi,

> So we will have to spawn a console port at id 0 when the bus is
> initialised.
>
> There are a couple of problems though:
> - How to identify which chardev to associate the port#0 with?

I'd suggest to give the serial-bus a chardev attribute, which is then 
simply passed through, i.e.

   -device virtio-serial-bus,chardev=<name>

automatically creates a virtioconsole with port=0 and chardev=<name> on 
the newly created bus.

> - If there is a virtioconsole device specified on the command line,
>    should that be used as port0? Or should that mean we spawn two
>    consoles?

Two consoles.

> I guess for both these cases, some special command line tweaks will be
> needed? Or keep the old '-virtioconsole' parameter and put that up as
> port0?

See above.

Keeping -virtioconsole for backward compatibility is easy, it would 
basically create a chardev with a virtio<nr> label as it does today, 
then create virtio-serial-bus with chardev=virtio<nr>.

cheers,
   Gerd