[CentOS-virt] Unknown boot option `pciback.hide=(09:04.0)': ignoring

Günter Zimmermann guenter.zimmermann at gmx.at
Tue Nov 24 07:19:15 UTC 2009

And last but not least the whole thing seems to work.
After adding
pci = ['09:04.0'] to domU
and installing pciutils in that domU I see the device listed there.

But I'm still unsure if it is okay to have it in lspci of dom0 too.  Has
someone else tried to use pciback as a module?

Regrds, Günter Zimmermann

Günter Zimmermann schrieb:
> Hi,
> after thinking about modules and modprobe.conf I added this line to
> modprobe.conf:
> options pciback hide=(09:04.0)
> and rebuilt initrd.
> mkinitrd -v --with=pciback /boot/initrd-2.6.18-164.6.1.el5xen_pcipt
> 2.6.18-164.6.1.el5xen
> after a reboot I found this message in dmesg:
> pciback 0000:09:04.0: seizing device
> looks like it works, but I still have the device in lspci in dom0. 
> Should it  be listed in lspci if pciback is working or not?
> Regards
> Günter Zimmermann
> Günter Zimmermann schrieb:
>> Good morning,
>> I need to use pciback.hide to hide a pci card because I want to pci
>> passthrough that card to a domU. My hardware neither supports Intel-Vt-d
>> nor AMD's IOMMU. Unfortunately this doesn't seem to work in Centos 54
>> anymore. I guess it doesn't work because it is not compiled into the
>> kernel, but as a module. I got the following error in dmesg and the pci
>> device is still listed in dom0 in lspci.
>> Bootdata ok (command line is ro root=/dev/dom0/root pciback.hide=(09:04.0))
>> Kernel command line: ro root=/dev/dom0/root pciback.hide=(09:04.0)
>> Unknown boot option `pciback.hide=(09:04.0)': ignoring
>> I also tried to update initrd to include the module but got the same
>> error message as above.
>> mkinitrd --with=pciback /boot/initrd-2.6.18-164.6.1.el5xen_pcipt
>> 2.6.18-164.6.1.el5xen
>> title CentOS (2.6.18-164.6.1.el5xen PCI PT)
>>     root (hd1,0)
>>     kernel /xen.gz-2.6.18-164.6.1.el5
>>     module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/dom0/root
>> pciback.hide=(09:04.0)
>>     module /boot/initrd-2.6.18-164.6.1.el5xen_pcipt
>> Is there any option to use pciback.hide kernel parameter without
>> compiling a custom kernel?
>> Thanks in advance
>> Günter Zimmermann
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