From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Q on ioctl support in netfront/netback
Date: Tue, 16 Feb 2010 13:14:54 -0500
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To: ravi kerur <rkerur@gmail.com>
Cc: Paul Durrant <paul.durrant@citrix.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
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On Mon, Feb 15, 2010 at 07:54:02AM -0800, ravi kerur wrote:
> Paul,
> 
> Registers are not in netback, they are h/w registers on NIC and the driver
> supports reads/writes via ioctl calls. Driver is in dom0 and application
> which reads/writes registers is run in domU.

You could use PCI passthrough. This way the NIC would be visible in your
DomU and you could fiddle with the registers.