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

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Message-ID: <20091001114244.GB12334@amit-x200.redhat.com>
Date:	Thu, 1 Oct 2009 17:28:01 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH] virtio_console: Add support for multiple ports for
	generic guest and host communication

On (Thu) Oct 01 2009 [12:28:30], Christian Borntraeger wrote:
> 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.

I spawned two ports; one doing 'find /' and the other transferring a
800M file from the host to the guest, both running at the same time.
This is on top of the latest Linus tree + my patches. It works fine.

Can you give me any additional info that can help me nail this down?

		Amit
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