On Mon, 15 Oct 2012, Gordon McLellan wrote:

pciback is compiled as a module:
[root@xenhost ~]# grep BACKEND /boot/config-3.6.1-1.fc17.x86_64

and the file does exist:
[root@xenhost ~]# ls -lah
total 108K
drwxr-xr-x 2 root root 4.0K Oct 12 10:19 .
drwxr-xr-x 4 root root 4.0K Oct 12 10:19 ..
-rwxr--r-- 1 root root 100K Oct 10 08:41 xen-pciback.ko

Near as I can tell the 0) is coming from the kernel command line but
it is getting mangled somewhere along the way.  If I remove the
xen-pciback.hide directive from the grub config file, the kernel is
able to load the pciback module without issue, and without any
configuration.  I tried moving the xen-pciback.hide directive to the
front of the kernel command line, it did not help.

From dmesg:
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.6.1-1.fc17.x86_64 (mockbuild@) (gcc
version 4.7.2 20120921 (Red Hat 4.7.2-2) (GCC) ) #1 SMP Wed Oct 10
12:13:05 UTC 2012
[    0.000000] Command line: placeholder root=/dev/mapper/vg0-root ro
xen-pciback.hide=(0b:00.0)(09:00.0) rd.md=0 rd.dm=0 rd.lvm.lv=vg0/swap
KEYTABLE=us rd.lvm.lv=vg0/root rd.luks=0 LANG=en_US.UTF-8

If you haven't already done so I suggest you get rid of anything in /etc/modprobe.d/ you added, just in case that is getting in the way.

        Michael Young
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