On 2011-05-09 08:45, Pasi Kärkkäinen wrote:
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
Perhaps you know how to extract the initramfs? I'm unable to find the
compression headers and I'm not sure what headers to look for. In the
first step I tried to locate the gzip header:
# grep -a -b --only-matching $'\x8B'$'\x08' \boot\initramfs-`uname
-r`.img
(offset1): (pattern)
...
(offset<n>): (pattern)
# dd if=/boot/intramfs-`uname -r`.img bs=1 skip=(offset1) | gunzip >
myimagefile
but I'm unable to get to the cpio file. I tried once again grepping for
compression headers in myimagefile but I couldn't find anything. It
appears not to be compressed with zx, bzip2 or gzip. I could not use
cpio on the file directly either.
Robin.
>>> 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
>> .
>>
> --
> xen mailing list
> xen(a)lists.fedoraproject.org
>
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.