[Xen-devel] Xen PCI passthrough & OpenWRT domU

[Jean Baptiste Favre <xen-devel@xxxxxxxxxxx>]

Hello,
I'm trying to make Openwrt running as domU with network cards PCI
passthrough.

First part is OK, OpenWRT runs fine as x86 PV domU, but not PCI passthrough.

Dom0 runs debian Xen packages.
# cat /proc/cmdline
placeholder root=/dev/mapper/system-root ro console=tty0 console=hvc0
console=ttyS0,115200n8 xen-pciback.permissive xen-pciback.hide=(04:00.0)
pci=resource_alignment=04:00.0 quiet

# lspci
...
04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E
Gigabit Ethernet Controller (rev 12)

# uname -a
Linux remus 2.6.32-5-xen-amd64 #1 SMP Fri Dec 10 17:41:50 UTC 2010
x86_64 GNU/Linux

OpenWRT uses upstream kernel 2.6.32.27 (but I also tested 2.6.35.9
without any changes).

domU informations:
# cat /proc/cmdline
root=/dev/xvda2 rw swiotlb=force console=hvc0 xencons=tty

# lspci
[empty]

# dmesg | grep -i pci
Allocating PCI resources starting at 10000000 (gap: 10000000:f0000000)
PCI: Fatal: No config space access function found
PCI: System does not support PCI
PCI: System does not support PCI
PCI: CLS 0 bytes, default 128
XENBUS: Device with no driver: device/pci/0

# dmesg | grep -i xen
 Xen: 0000000000000000 - 00000000000a0000 (usable)
 Xen: 00000000000a0000 - 0000000000100000 (reserved)
 Xen: 0000000000100000 - 0000000010000000 (usable)
  #0 [00014c6000 - 00014d4000]   XEN PAGETABLES ==> [00014c6000 -
00014d4000]
  #3 [0001483000 - 00014c6000]   XEN START INFO ==> [0001483000 -
00014c6000]
Booting paravirtualized kernel on Xen
Xen version: 4.0.1 (preserve-AD)
Xen: using vcpu_info placement
Kernel command line: root=/dev/xvda2 rw swiotlb=force console=hvc0
xencons=tty
Xen: using vcpuop timer interface
installing Xen timer for CPU 0
xen_balloon: Initialising balloon driver.
Switching to clocksource xen
Initialising Xen virtual ethernet driver.
XENBUS: Device with no driver: device/pci/0
XENBUS: Device with no driver: device/console/0

So, it seems that domU sees PCI device (and sky2 module is loaded), but
do not recognize it.
I have tried to compile PCI frontend driver, which is not by default,
but not sure I succeeded. How can I check it ?

Another question, are there any requirement in terms of kernel version
regarding the version of Xen I use ? If yes, how can I check that too ?

Sorry for long email, but I also ask it on OpenWRT devel list without
answer for now.
Regards,
JB

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