linux-kernel - Re: [PATCH] virtio_console: Add support for multiple ports for generic guest and host communication

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Message-Id: <200910011228.30563.borntraeger@de.ibm.com>
Date:	Thu, 1 Oct 2009 12:28:30 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Alan Cox <alan@...ux.intel.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_console: Add support for multiple ports for generic guest and host communication

Am Mittwoch 30 September 2009 19:13:21 schrieben Sie:
> On (Tue) Sep 29 2009 [15:31:23], Christian Borntraeger wrote:
> > Am Dienstag 29 September 2009 15:09:50 schrieb Amit Shah:
> > > Great, thanks. However I was thinking of moving this init to the
> > > probe() routine instead of in the init_conosle routine just because
> > > multiple consoles can be added and we don't want to init this each
> > > time.. just once in probe is fine.
> >
> > If you have new patch CC me and I can give it a spin.
> 
> Hey Christian,
> 
> I have a new patch that changes a few things:
> - moves the put_char fix to probe instead of doing it in
>   init_port_console(), which gets called on each console port found.
> - uses port->id instead of a static hvc_vtermno to pass on a value to
>   hvc_alloc(). Motivation explained within comments in the code.
> - A few other changes that introduce and make use of port->vcon instead
>   of accessing the static virtconsole directly -- aimed at easing future
>   fix to have multiple virtio-console devices.
> 
> It would be great if you could test this.

With the latest git kernel + your patch I sometmes get a completely frozen 
console. In the dump there is 

    <3>virtio_console virtio0: output:id 68 is not a head!

Seems that I can reproduce it with large amounts of output (find / for example)
Without your patch everything is fine.

Christian

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