linux-kernel - Re: Can't build in the virtio console driver on x86_64 when the other virtio drivers are modular

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Date:	Mon, 28 Feb 2011 10:34:56 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: Can't build in the virtio console driver on x86_64 when the
 other virtio drivers are modular

On (Fri) 25 Feb 2011 [12:13:20], Chuck Ebbert wrote:
> On Fri, 25 Feb 2011 11:38:15 +0530
> Amit Shah <amit.shah@...hat.com> wrote:
> 
> > On (Thu) 24 Feb 2011 [11:28:19], Chuck Ebbert wrote:
> > > The virtio configuration options are inconsistent. According to this,
> > > every options that needs virtio will select it:
> > > 
> > >  # Virtio always gets selected by whoever wants it.
> > >  config VIRTIO
> > >         tristate
> > > 
> > > Note that it's not user-selectable, so any config file that tries to
> > > set it will be ignored when kconfig loads those options. And yet we
> > > have a whole set of options that depend on VIRTIO, like VIRTIO_CONSOLE
> > > for example. This makes it impossible to have VIRTIO_PCI modular and
> > > VIRTIO_CONSOLE built-in on x86_64, because:
> > 
> > Any reason to have VIRTIO_PCI modular instead of built in (on x86-64,
> > virtio-console won't work without virtio-pci anyway)?
> > 
> 
> None that I know of offhand, other than not building in things unless
> absolutely necessary. There's no dependency of any kind there, so it's
> even possible to build a kernel with VIRTIO_CONSOLE enabled and
> VIRTIO_PCI completely disabled.

Yes, that's that way because not all architectures need virtio-pci to
have virtio-console functional (eg. s390, which doesn't have a PCI
bus).

So if you're only interested in the x86-64 arch, you could compile in
virtio-pci and virtio-console and this should happily work.

		Amit
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