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This is my first post, so I am hoping this is the
right place to ask my question... I have been
asked to test some training materials that we received, and provide sample
solutions. I've been unable to get one of the exercises to work properly,
even though it follows the same steps that are available both in the documentation, and throughout the
web.
The task is to unbind the
PCI sound card from Domain0 and then assign it to a new VM, as shown
below.
===================
(1) Load the pciback
module by typing -> modprobe pciback
(2) Get the PCI ID for the hardware you will
be using by typing > lspci
(3) Unbind the desired device intended
for pciback. Go to /sys/bus/drivers and look for the folder with your driver. Go
in the folder and you will see the sym link for the device starting with your
pci_id. Next ->
echo -n [pci-slot-id] >
/sys/bus/pci/drivers/e100/unbind
Now that sym link you just checked out should be
gone.
(4) Now bind the device to
pciback.
echo -n [pci-slot-id] >
/sys/bus/pci/drivers/pciback/new_slot
echo -n [pci-slot-id] >
/sys/bus/pci/drivers/pciback/bind
Go to the pciback directory and you should see a
new sym link created.
Now configure your Virtual Machine (DomU) to use
the device.
===================
Every time I get to the command:
echo -n 0000:00:0b.0 >
/sys/bus/pci/drivers/e100/unbind
my terminal window locks up. Although I have no
other processes running, it appears the sound card is being used. I have
tried this several different ways, and can't seem to get past the unbind
command. It's an ensoniq card, so I tried to search for other
dependencies and found:
# lsmod | grep
ens
snd_ens1371
30880
1
gameport
19464 1
snd_ens1371
snd_rawmidi
30848 2
snd_seq_midi,snd_ens1371
snd_ac97_codec
98592 1
snd_ens1371
snd_pcm
101124 3
snd_pcm_oss,snd_ens1371,snd_ac97_codec
snd
63492 12
snd_pcm_oss,snd_mixer_oss,snd_seq_midi,snd_seq,snd_ens1371,snd_rawmidi,snd_seq_device,snd_ac97_codec,snd_pcm,snd_timer
#
I can make the sound card available if I edit
/etc/modprobe.conf.local with:
options pciback
hide=(0000:00:0b.0)
and then reboot. However, I would like to find some way to get the example that is so
widely documented to work. Does anyone know how I can ensure that the
sound card is free and available so that the unbind works
correctly?
Peg
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