Re: PCI Passthrough, error: The driver 'pci-stub' is occupying your device 0000:08:06.2

James Neave
2011-02-12T16:04:45Z

On Tue, Feb 8, 2011 at 10:17 AM, James Neave <roboj1m@gmail.com> wrote:
> On Tue, Feb 8, 2011 at 9:59 AM, Kenni Lund <kenni@kelu.dk> wrote:
>> 2011/2/7 Daniel P. Berrange <berrange@redhat.com>:
>>> On Sat, Feb 05, 2011 at 04:34:01PM +0000, James Neave wrote:
>>>> Hi,
>>>>
>>>> I'm trying to pass a NOVA-T-500 TV Tuner card through to a gust VM.
>>>> I'm getting the error "The driver 'pci-stub' is occupying your device
>>>> 0000:08:06.2"
>>>
>>> This is a rather misleading error message. It is *expected* that
>>> pci-stub will occupy the device. Unfortunately the rest of the
>>> error messages QEMU is printing aren't much help either, but
>>> ultimately something is returning -EBUSY in the PCI device assign
>>> step
>>
>> James, as far as I remember, I had the same issue when I set up my
>> system. Looking at my current (working) boot-script, apparently I've
>> added a 4th line which removes the pci-stub again as a
>> workaround....and it works:
>>
>> echo "4444 0016" > /sys/bus/pci/drivers/pci-stub/new_id
>> echo "0000:04:08.0" > /sys/bus/pci/drivers/ivtv/unbind
>> echo "0000:04:08.0" > /sys/bus/pci/drivers/pci-stub/bind
>> echo "4444 0016" > /sys/bus/pci/drivers/pci-stub/remove_id
>>
>> Best regards
>> Kenni
>>
>
> Hi Kenni,
>
> Can I get a bit more information on "boot-script" please? Which file
> exaclty have you put this in? Did you write your own service script
> and put it in init.d?
>
> I've tried this:
>
> echo "8086 10b9" > /sys/bus/pci/drivers/pci-stub/new_id
> echo 0000:01:00.0 > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
> echo 0000:01:00.0 > /sys/bus/pci/drivers/pci-stub/bind
>
> I'll try it again with the fourth line added, manually before I start the VM.
>
> How come yours is 'echo "PCI" > /sys/bus/drivers/DRIVERNAME/unbind'
> and mine is echo "PCI" > /sys/bus/pci/devices/PCI/driver/unbind
>
> Obviously one looks up which driver is being used by the PCI id, but
> how do I look up which driver my PCI card is using?
>
> Thanks,
>
> James.
>

Hi,

OK, adding the fourth line does nothing, changing the second line to
"driver" rather than "device" does nothing, including in combination
with fourth line there/not there.

So I'm still stuck, can anybody else help?
Perhaps point me to a guide on how to compile the latest qemu-kvm
against my kernel?

Thanks,

James.