Re: [Xen-users] PCI Passthru working on RHEL 5.1?

[Mark Chandler <mcl@xxxxxxxxxxx>]

Nadolski, Ed wrote:
> What Linux(es) is PCI passthru known to work?  I'm a Xen newbie trying
> to get PCI passthru to work on RHEL5.1.  Has anyone successfully done
> this?  I get the "seizing device" from pciback in dom0 but lspci in the
> domU shows nothing, and dmesg in the domU shows no messages from
> pcifront.  My domU config file entry looks like this:
>
> pci = [ '07:00.0' ]
>
> Any thoughts?  Do I need to rebuild the kernel with pcifront linked in?
> (I'm not sure if RHEL does that by default).
>
> Thanks in advance,
> Ed
>
>
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>   
This is most definitely working in RHEL 5.1. I used it recently to pass 
four Ethernet interfaces through to a guest that uses them for network 
monitoring. I think the only difference I have is that I used the bus id 
as part of the PCI string. So, I had pci=[ "0000:10:00.0" ].
I had to load the pciback module early on in the boot sequence by adding 
"modprobe pciback" into a file called /etc/rc.modules (needs to be 
executable) as per the Deployment Guide's instructions. Otherwise, the 
Ethernet modules got there first, and I had to unload them before I 
could use pciback to claim the devices.
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/en-US/RHEL510/Deployment_Guide/s1-kernel-modules-persistant.html

Hope this helps,

Mark C.

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