linux-kernel - Re: [RFC v2] virtio: add virtio-over-PCI driver

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Message-ID: <20090226202558.GB19523@ovro.caltech.edu>
Date:	Thu, 26 Feb 2009 12:25:58 -0800
From:	Ira Snyder <iws@...o.caltech.edu>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...abs.org,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	Jan-Bernd Themann <THEMANN@...ibm.com>
Subject: Re: [RFC v2] virtio: add virtio-over-PCI driver

On Thu, Feb 26, 2009 at 05:53:56PM +0100, Geert Uytterhoeven wrote:
> On Thu, 26 Feb 2009, Arnd Bergmann wrote:
> > On Tuesday 24 February 2009, Ira Snyder wrote:
> > > +/* Virtio-over-PCI descriptors: 12 bytes. These can chain together via "next" */
> > > +struct vop_desc {
> > > +	/* Address (host physical) */
> > > +	__le32 addr;
>                ^^^^
> Only 32-bit? Is this future-proof?
> 

Probably not. If I use __le64 instead, how do I write 64 bytes over the
PCI bus? There isn't an iowrite64()/ioread64() anywhere in Linux.

Thanks,
Ira
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