Re: [Fedora-xen] How to use xen-pciback
On Fri, May 06, 2011 at 04:18:14PM +0200, Robin Axelsson wrote:
On 2011-05-06 08:03, Pasi Kärkkäinen wrote:
> On Thu, May 05, 2011 at 07:48:36PM +0200, Robin Axelsson wrote:
>> Hi,
>> I have compiled Jeremy's kernel on Fedora 14 and it turned out that
>> xen-pciback is compiled into the kernel as a module. So I made a
>> "xen-pciback.conf" file in /etc/modprobe.d. The problem is that I
have
>> to get modprobe to load before the drivers to the PCI devices I want to
>> hide are loaded.
>>
>> So my question is how do I locate the drivers and find the points in the
>> boot scripts where I can put the modprobe so that it is loaded before
>> them? I tried lsmod and modinfo but they don't give much information. I
>> only managed to find the driver for the Intel EXPI9400PT adapter e1000e.
>>
>> I want to hide the graphics adapter (Radeon 5450), Two USB2.0 ports, the
>> Intel adapter, the USB3.0 controller and the Audio device, their
>> assignments on machine are as follows:
>>
>> pci_0000_00_02_0 (GPU)
>> pci_0000_00_12_0 (USB 2.0 should give 2 ports)
>> pci_0000_00_14_2 (Audio device)
>> pci_0000_00_0a_0 (Intel Adapter)
>> pci_0000_00_09_0 (USB 3.0 Interface)
>>
>> but the question is where can I locate their drivers and how can I tap
>> into the boot sequence so that the xen-pciback driver is loaded
>> beforehand? The page
>>
>>
http://wiki.xensource.com/xenwiki/Assign_hardware_to_DomU_with_PCIBack_as...
>>
>> gives no information about this. It mentions something about "install
>> skge ... " but it doesn't say where this line is to be put and how you
>> figure out that skge is the driver to be disabled.
>>
> You probably should add the modules to be loaded from initrd image.
>
> Are you using mkinitrd? If yes, there's an option to preload modules..
>
> -- Pasi
I issued the command
mkinitrd -v -f --preload xen-pciback /boot/initramfs-2.6.32.39.img
2.6.32.39
and I noticed that the initramfs image file generated is considerably
smaller than the initramfs imagefile generated by dracut. The dracut
file is a bit over 80 MB whereas the new one is less than 8 MB.
But the preload doesn't load the xen-pciback module. After the reboot
when I list assignable PCI devices using xm, Xen returns nothing. If I
issue 'modprobe xen-pciback' and then list the devices using xm I get
one entry. What's wrong?
Hmm.. Is it possible that the other xen-related required modules
are not yet loaded at that point, so loading xen-pciback fails?
You could always extract initramfs-2.6.32.39.img and read the 'init'
script in it and see what it's trying to do..
-- Pasi
>> I have set up the machine to init level 3 in the /etc/inittab (my
>> install of F14 have no upstart targets). The xen-pciback module seems to
>> be working. Something is wrong with the onboard sound chip. No drivers
>> have ever successfully initiated it, neither in Windows nor Linux. So it
>> is marked as an assignable device when looking it up with xm.
>>
>> Regards
>>
>> Robin.
>>
>> --
>> xen mailing list
>> xen(a)lists.fedoraproject.org
>> https://admin.fedoraproject.org/mailman/listinfo/xen
> .
>
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