linux-kernel - Re: [PATCH] virtio: make PCI devices take a virtio

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Message-Id: <200812071852.08962.rusty@rustcorp.com.au>
Date:	Sun, 7 Dec 2008 18:52:08 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Anthony Liguori <aliguori@...ibm.com>,
	Michael Tokarev <mjt@....msk.ru>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] virtio: make PCI devices take a virtio_pci module ref

On Saturday 06 December 2008 01:37:06 Mark McLoughlin wrote:
> Another example of a lack of an explicit dependency causing problems is
> Fedora's mkinitrd having this hack:
> 
>     if echo $PWD | grep -q /virtio-pci/ ; then
>         findmodule virtio_pci
>     fi
>
> which basically says "if this is a virtio device, don't forget to
> include virtio_pci in the initrd too!". Now, mkinitrd is full of hacks,
> but this is a particularly unusual one.

Um, I don't know what this does, sorry.

I have no idea how Fedora chooses what to put in an initrd; I can't think
of a sensible way of deciding what goes in and what doesn't other than
lists and heuristics.

But there really is no explicit dependency between virtio modules and
virtio_pci.  There just is for kvm/x86 at the moment, since that is how
they use virtio.  Running over another bus is certainly possible,
though may never happen for x86 (happens today for s390).

Cheers,
Rusty.
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