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_module
>>>>
>>>> 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.
>>>>
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>>>> xen@lists.fedoraproject.org
>>>> https://admin.fedoraproject.org/mailman/listinfo/xen
>>> .
>>>
>> --
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> .
>

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