[Fedora-xen] PCI problems with Xen kernel on SiS motherboard

[Winston Chang]

I just installed FC5-T3 on my computer.  With the normal kernel,  
everthing works fine, but when I boot into the xen-hypervisor kernel,  
kudzu crashes and eth0 won't come up -- it says no such device.  USB  
ports don't work either, under the xen kernel.

I think the problem has something to do with PCI under the xen  
kernel.  Running lspci under the xen kernel returns absolutely  
nothing, and there is nothing in /proc/pci either.  This happens with  
both the stock 1955 kernel and the updated 2009 kernel.  It also  
happened with the FC4 xen kernel, which I why I went to a FC5 test  
distribution in the first place...

It's a desktop system, but it has a mobile Athlon XP 2800+ on a cheap  
PC Chips motherboard, with a SiS 760 GX northbridge and a SiS 964  
southbridge.

Has anyone else seen this or know of a possible fix?

--Winston

===============================================
This is the output when I run on the non-xen kernel (the xen kernel  
simply returns nothing for lspci):

[root at localhost ~]# uname -a
Linux localhost.localdomain 2.6.15-1.2009.4.2_FC5 #1 Thu Mar 2  
18:10:16 EST 2006 i686 athlon i386 GNU/Linux

[root at localhost ~]# lspci
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 741/741GX/M741  
Host (rev 03)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS AGP Port  
(virtual PCI-to-PCI bridge)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS964 [MuTIOL  
Media IO] (rev 36)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE]  
(rev 01)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS]  
Sound Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0  
Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0  
Controller (rev 0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0  
Controller (rev 0f)
00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0  
Controller
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900  
PCI Fast Ethernet (rev 91)
01:00.0 VGA compatible controller: nVidia Corporation NV43 [GeForce  
6600/GeForce 6600 GT] (rev a2)