Bug#445987: OOPS in xen domU

[<rolf@autistici.org>]

I see the problem is still there in the latest Debian kernel,
2.6.18-6-xen-vserver-amd64: I get the same oops.

I'd like to apply one of your patches but I cannot find the
pci-dma-xen.c file in the Debian pre-packaged kernel sources
(apt-get source linux-image-2.6.18-6-xen-vserver-amd64).

I would like to build the kernel starting from Debian source
package but while I can see its structure deals with xen too
I cannot figure out how to really add the Xen support to it.

Thank you

Rolf