From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: SR-IOV function passthrough to a PV domU
Date: Tue, 15 Jun 2010 22:29:24 +0100
Message-ID: <C83DAF44.179C9%keir.fraser@eu.citrix.com>
References: <1276636535.4079.49.camel@chrisr-laptop>
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To: Chris Reeves <chrisr@spectralogic.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Cc: Jan Beulich <JBeulich@novell.com>
List-Id: xen-devel@lists.xenproject.org

The pciback driver in dom0 needs patching.

See http://xenbits.xensource.com/linux-2.6.18-xen.hg changeset 999, for
example. I would imagine some vendor kernels may be missing this, although I
thought Novell had it. Jan might be able to say (cc'ed).

 -- Keir

On 15/06/2010 22:15, "Chris Reeves" <chrisr@spectralogic.com> wrote:

> I'm trying to pass through an SR-IOV virtual function to a PV domU.
> The pci passthrough seems to work, but the virtual function never shows
> up on the pci bus of the domU.  All I see is a message stating:
> [  342.002602] pcifront pci-0: Rescanning PCI Frontend Bus 0000:00
> 
> I'm using kernel 2.6.31.12-0.1-xen from OpenSUSE on the dom0 and domU
> and Xen 4.0.  I've recompiled with the CONFIG_XEN_PCIDEV_FE_DEBUG option
> set, but I don't get any additional output when attaching the device.
> 
> Is it possible to use pci passthrough with SR-IOV virtual functions to a
> PV domU?
> 
> I noticed in this thread:
> http://lists.xensource.com/archives/html/xen-devel/2010-03/msg00082.html
> That someone mentioned a specific SR-IOV pcifront driver.
> Does anyone know where this driver may be available?
> 
> For what it's worth, I've also tried kernel 2.6.34 with the xen patches
> from http://code.google.com/p/gentoo-xen-kernel/downloads/list and I get
> the same results.
> 
> Thanks,
> Chris
> 
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