linux-kernel - Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation

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Message-ID: <20120904185541.GB3602@redhat.com>
Date:	Tue, 4 Sep 2012 21:55:41 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Sjur Brændeland <sjurbren@...il.com>
Cc:	Amit Shah <amit.shah@...hat.com>, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation

On Tue, Sep 04, 2012 at 06:58:47PM +0200, Sjur Brændeland wrote:
> Hi Michael,
> 
> > Exactly. Though if we just fail load it will be much less code.
> >
> > Generally, using a feature bit for this is a bit of a problem though:
> > normally driver is expected to be able to simply ignore
> > a feature bit. In this case driver is required to
> > do something so a feature bit is not a good fit.
> > I am not sure what the right thing to do is.
> 
> I see - so in order to avoid the binding between driver and device
> there are two options I guess. Either make virtio_dev_match() or
> virtcons_probe() fail. Neither of them seems like the obvious choice.
> 
> Maybe adding a check for VIRTIO_CONSOLE_F_DMA_MEM match
> between device and driver in virtcons_probe() is the lesser evil?
> 
> Regards,
> Sjur

A simplest thing to do is change dev id. rusty?

-- 
MST
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