[Xen-users] Atheros AR9287 PCI passthrough issue

[Etienne FLYE SAINTE MARIE <etn@xxxxxxx>]

Hi,
i'm trying to use PCI passthrough feature on Xen 4.0 but it fails on my Wireless card.

I use Xen 4.0 on a Debian 6.0 (package from repo) and try to passthrough the following PCI device
root@omega:~# dpkg -l | grep xen
ii  libxenstore3.0                      4.0.1-1                     Xenstore communications library for Xen
ii  linux-image-2.6.32-5-xen-amd64      2.6.32-30                   Linux 2.6.32 for 64-bit PCs, Xen dom0 support
ii  xen-hypervisor-4.0-amd64            4.0.1-1                     The Xen Hypervisor on AMD64
ii  xen-qemu-dm-4.0                     4.0.1-2                     Xen Qemu Device Model virtual machine hardware emulator
ii  xen-tools                           4.2-1                       Tools to manage Xen virtual servers
ii  xen-utils-4.0                       4.0.1-1                     XEN administrative tools
ii  xen-utils-common                    4.0.0-1                     XEN administrative tools - common files
ii  xenstore-utils                      4.0.1-1                     Xenstore utilities for Xen

root@omega:~# lspci
(...)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
03:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)

root@omega:~# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet xen-pciback.permissive xen-pciback.hide=(01:00.0)(03:00.0) pci=resource_alignment=01:00.0;03:00.0"
GRUB_CMDLINE_LINUX=""

root@omega:~# xm pci-list-assignable-devices
0000:03:00.0
0000:01:00.0

the LAN device works perfectly on the DomU configured with it but it fails on the WLAN one:


root@omega:~# cat /etc/xen/AccessPoint.cfg
#
# Configuration file for the Xen instance AccessPoint, created
# by xen-tools 4.2 on Fri Jan 14 17:37:08 2011.
#

#
#  Kernel + memory size
#
kernel      = '/boot/vmlinuz-2.6.32-5-xen-amd64'
ramdisk     = '/boot/initrd.img-2.6.32-5-xen-amd64'

vcpus       = '1'
memory      = '256'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'phy:/dev/lvg-xen/AccessPoint-disk,xvda2,w',
                  'phy:/dev/lvg-xen/AccessPoint-swap,xvda1,w',
              ]


#
#  Physical volumes
#


#
#  Hostname
#
name        = 'AccessPoint'

#
#  Networking
#
vif         = [ 'ip=192.168.42.5,mac=00:16:3E:1E:88:3E' ]

pci=['03:00.0']
#
#  Behaviour
#

on_reboot   = 'restart'
on_crash    = 'restart'


On the DomU:

root@AccessPoint:~# lspci
00:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)

root@AccessPoint:~# ifconfig wlan0 up
[   51.254777] ADDRCONF(NETDEV_UP): wlan0: link is not ready

root@AccessPoint:~# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any 
          Mode:Managed  Access Point: Not-Associated   Tx-Power=16 dBm  
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on
         
root@AccessPoint:~# iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

[   86.863546] ath: ffff88000dd95be0
[   86.863553] ath: ffff88000dd95c00
[   86.874968] ath: ffff88000dd95bc0
[   86.944314] ath: ffff88000dd95bc0
[   86.944364] ath: ffff88000dd95bf0
[   86.955778] ath: ffff88000dd95be0
[   86.955783] ath: ffff88000dd95c00
[   86.967241] ath: ffff88000dd95bc0
[   87.036195] ath: ffff88000dd95bc0
[   87.036243] ath: ffff88000dd95bf0
[   87.108346] ath: ffff88000dd95bc0
[   87.108395] ath: ffff88000dd95bf0
[   87.119864] ath: ffff88000dd95be0
[   87.119870] ath: ffff88000dd95c00
[   87.131275] ath: ffff88000dd95bc0
[   87.200197] ath: ffff88000dd95bc0
[   87.200245] ath: ffff88000dd95bf0
[   87.272314] ath: ffff88000dd95bc0
[   87.272363] ath: ffff88000dd95bf0
[   87.283832] ath: ffff88000dd95be0
[   87.283837] ath: ffff88000dd95c00
[   87.295239] ath: ffff88000dd95bc0
[   87.364314] ath: ffff88000dd95bc0
[   87.364363] ath: ffff88000dd95bf0
[   87.375829] ath: ffff88000dd95be0
[   87.375835] ath: ffff88000dd95c00
[   87.387240] ath: ffff88000dd95bc0
[   87.456364] ath: ffff88000dd95bc0
[   87.456414] ath: ffff88000dd95bf0
[   87.467821] ath: ffff88000dd95be0
[   87.467826] ath: ffff88000dd95c00
[   87.479286] ath: ffff88000dd95bc0
[   87.548195] ath: ffff88000dd95bc0
[   87.548243] ath: ffff88000dd95bf0
[   87.620314] ath: ffff88000dd95bc0
[   87.620363] ath: ffff88000dd95bf0
[   87.631776] ath: ffff88000dd95be0
[   87.631781] ath: ffff88000dd95c00
[   87.643240] ath: ffff88000dd95bc0
[   87.712209] ath: ffff88000dd95bc0
[   87.712257] ath: ffff88000dd95bf0
[   87.784329] ath: ffff88000dd95bc0
[   87.784378] ath: ffff88000dd95bf0
[   87.795844] ath: ffff88000dd95be0
[   87.795849] ath: ffff88000dd95c00
[   87.807263] ath: ffff88000dd95bc0
[   87.947540] ath: ffff88000dd95be0
[   87.947546] ath: ffff88000dd95c00
[   87.959001] ath: ffff88000dd95bc0
[   88.099529] ath: ffff88000dd95be0
[   88.099535] ath: ffff88000dd95c00
[   88.110942] ath: ffff88000dd95bc0
[   88.251550] ath: ffff88000dd95c40
[   88.251555] ath: ffff88000dd95c60
[   88.263024] ath: ffff88000dd95c20wlan0     No scan results


WLAN Card can't see any ssid whereas this command works on Dom0 if i unhide the device.

Do you any idea why it fails on it? If you have any idea on configuration side, i'm listenning ;)

Thanks a lot

Etienne

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