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Re: [Xen-users] pciback/front in Fedora 10 domU: should this work?

To: John Morris <john@xxxxxxxxxxx>
Subject: Re: [Xen-users] pciback/front in Fedora 10 domU: should this work?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sun, 21 Dec 2008 14:43:24 +0200
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On Sun, Dec 21, 2008 at 02:25:39PM +0800, John Morris wrote:
> Todd,
> >>Is pcifront perhaps disabled in the stock Fedora 10 kernel?  What can I
> >>check to get more information?
> >>
> >
> >Compare the kernel configs for the Fedora and Centos domUs
> A little investigation shows that the CentOS 2.6.18 kernel RPM has a 
> separate patch that adds Xen capability, as well as a config option 
> The Fedora 2.6.27 kernel, however, is the new paravirt_ops kernel that 
> doesn't need a separate Xen patch (if I understand correctly).  However, 
> the Xen-related config options in this kernel are much more limited, and 
> there is nothing about passing PCI devices.
> >>Back to the original goal, is anyone aware of a quick way to get a domU up
> >>and running with a >=2.6.25 kernel (with the new wireless architecture) 
> >>that
> >>has pcifront functionality?
> >>
> >
> >Have you tried enabling the Xen options, in a kernel.org kernel?
> >You can base your config on the fedora10 domU's kernel even.
> I haven't tried this yet, and may do so for a proof-of-concept. 
> However, I forgot to state another condition, the final solution needs 
> to be in RPM form.
> One more relevant fact:  the latest Xen-ified kernel source on xen.org 
> is a 2.6.18 kernel.
> What this is all starting to look like is, the last Xen kernel that 
> supported pcifront was the last one with the separate Xen patch, that 
> is, 2.6.18.  Xen-capable kernels after this seem to be the new pvops 
> kernels which don't have pcifront capability.  Since the new wireless 
> architecture was only released in more recent kernels, it looks like I 
> won't be able to achieve this goal.  Does this sound right?  I'd be very 
> happy if anyone would show me I'm wrong.  ;)

pv_ops Xen support in upstream/vanilla Linux kernels is a work in progress..
currently dom0 support is being worked on and it should be included in
upcoming Linux 2.6.29.

See: http://wiki.xensource.com/xenwiki/XenParavirtOps

There's also a temporary 'stop-gap' Linux 2.6.27 based tree, with the
Xenlinux patches from Novell/SLES (forward-ported from Xensource Xenlinux 


That temporary 2.6.27 tree should have 'all' the features.. 


-- Pasi

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