[Xen-bugs] [Bug 556] New: No PCI bus with Xen kernel on SiS motherboard

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=556

           Summary: No PCI bus with Xen kernel on SiS motherboard
           Product: Xen
           Version: 3.0.1
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: winston@xxxxxxxxxx


I just installed Fedora Core 5 Test 3 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.  The same thing also happened when I used the Xen
3.0 Demo CD.


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 (in FC5-T3) 1955 kernel and
the updated 2009 kernel.

It's a desktop system with a mobile Athlon XP 2800+ on a PC Chips motherboard,
with a SiS 760 GX northbridge and a SiS 964 southbridge.  When I moved the hard
drive to a Dell GX270, the PCI bus worked fine.

Someone else reported the same problem here:
http://lists.xensource.com/archives/html/xen-users/2006-03/msg00120.html

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

[root@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@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)

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