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

[Anthony Liguori <anthony@codemonkey.ws>]

Gerd Hoffmann wrote:
> On 10/07/09 13:42, Amit Shah wrote:
>> On (Wed) Oct 07 2009 [13:33:57], Gerd Hoffmann wrote:
>>> Second, the bus= argument is optional.  If not specified, qdev will 
>>> pick
>>> the first bus of a matching type it finds.  So as long you have a 
>>> single
>>> port/scsi/usb/... bus only you don't need bus= at all.  You can do:
>>
>> The problem with this is that the management solution needs to know then
>> what is the default bus name (which could change if the code gets
>> updated).
>
> No problem.  Just don't use -virtioconsole.  Go with -device 
> virtio-serial-bus,id=... + -device virtport,bus=.. then and explicitly 
> name your devices (and thereby the buses too).
>
> -virtioconsole should *really* be a pure backward compatibility thing. 
> Use case:  You have a script starting qemu using -virtioconsole.  
> After upgrading qemu it should continue to work, i.e. create a device 
> which the guest can use as before the upgrade and which is linked up 
> to a chardev as it was before.
>
> Anything which wants to use the new features can (and should) 
> completely ignore -virtioconsole.  I just wanted to point out that 
> mixing old and new style is *possible*.  It wasn't my intention to 
> imply that I *recommend* doing that.

I agree.

Regards,

Anthony Liguori