From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [RFC 7/11] virtio_pci: new, capability-aware driver.
Date: Wed, 11 Jan 2012 23:58:09 +0200
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Pawel Moll <pawel.moll@arm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, virtualization <virtualization@lists.linux-foundation.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Sasha Levin <levinsasha928@gmail.com>
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On Wed, Jan 11, 2012 at 02:26:55PM -0600, Anthony Liguori wrote:
> On 01/11/2012 02:14 PM, Michael S. Tsirkin wrote:
> >On Wed, Jan 11, 2012 at 01:42:39PM -0600, Anthony Liguori wrote:
> >>On 01/11/2012 11:08 AM, Michael S. Tsirkin wrote:
> >>>
> >>>Not sure what you mean. Using VQ is DMA which is pretty common for PCI.
> >>
> >>Do you know of a network device that obtains it's mac address via a DMA transaction?
> >
> >Sure.
> >See mlx4_replace_mac in drivers/net/ethernet/mellanox/mlx4/port.c
> 
> I'd say that's a special case but I see what you're getting at here.
> 
> So what about keeping the config space read-only and using control
> queues for everything else?

Not just read-only - constant.

> Regards,
> 
> Anthony Liguori
> 
> >
> >>Regards,
> >>
> >>Anthony Liguori
> >>
> >>>
> >>>>>