You could try a brute-force test by editing
linux/drivers/xen/pciback/conf_space.c and finding the line:
if (dev_data->permissive) {
And change it to:
if (1) {
You can then put xend-pci-permissive.sxp back as it was.
This should allow any PCI config accesses by your domU driver domain to
succeed.
-- Keir
On 23/8/07 18:07, "Matthias Wolf" <matthias.wolf@xxxxxx> wrote:
> Keir,
>
> thanks a lot for your concern!
>
> Unfortunately, your answer didn't take me too far: At first it was not
> that easy to find out the vendor:device - combination.
>
> lspci -n
>
> returns
>
> 00:1d.7 0c03: 8086:268c (rev 09)
>
> so I assumed 8086:268c was the combination I've been looking for. I
> edited /etc/xen/xend-pci-permissive.sxp which afterwards looked like
> this (apart from the comment-lines:
>
> (unconstrained_dev_ids
> ('8086:268c')
> )
>
> When I bootet the machine hiding LAN-adapters *and* the tapedrive, the
> network-functionality vanished completely, and no devicefiles for the
> tape were built in the domU (/dev/*st*).
>
> I tried
>
> lspci --nn --vv -d 8086:268c
>
> to learn that there is a "Subsystem" with an "Unknown device", so I
> edited /etc/xen/xend-pci-permissive.sxp which then looked like this:
>
> (unconstrained_dev_ids
> ('8086:268c:8086:3484')
> )
>
> but the result was the same as before: no devicefile for the tapedrive
> in the domU *and* no networking functionality at all.
>
> This kind of puzzles me, as the respective stanzas in
> /boot/grub/menu.lst look like this:
>
>
> title Xen 3.0.3-1-amd64 / 2.6.18-3-xen-amd64 (LAN & DAT\
> hidden)
> root (hd0,0)
> kernel /xen-3.0.3-1-amd64.gz
> module /vmlinuz-2.6.18-3-xen-amd64\
> root=/dev/mapper/vgraid0-lvroot ro console=tty0\
> pciback.hide=(05:00.0)(05:00.1)(00:1d.7) maxloop=128
> module /initrd.img-2.6.18-3-xen-amd64
> savedefault
>
> title Xen 3.0.3-1-amd64 / 2.6.18-3-xen-amd64 (LAN hidden)
> root (hd0,0)
> kernel /xen-3.0.3-1-amd64.gz module
> /vmlinuz-2.6.18-3-xen-amd64 root=/dev/mapper/vgraid0-lvroot ro\
> console=tty0 pciback.hide=(05:00.0)(05:00.1) maxloop=128
> module /initrd.img-2.6.18-3-xen-amd64
> savedefault
>
> and I can't spot the difference apart from hiding the tapedrive in the
> former entry and not doing so in the latter one.
>
> Can anyone help me out? I have to fix this, and I would rather not like
> to do backups in the dom0, but as it seems at the moment, I'll have to.
>
> Thanks in advance,
>
> greetings from Vienna/Austria
> Matthew
>
>
>
> Keir Fraser schrieb:
>> 'lspci -n' to find out what the numeric vendor-id and device-id is for the
>> device at PCI slot location 00:1d.7. Then add that vendor-id:device-id pair
>> to /etc/xen/xend-pci-permissive.sxp. When you create the domain that is
>> assigned the PCI device, you should see a warning appear in dmesg or
>> /var/log/messages about the fact that a domU is being allowed to write to
>> any part of a device's PCI config space. You can ignore that, but it shows
>> that the change to /etc/xen/xend-pci-permissive.sxp is working.
>>
>> -- Keir
>>
>> On 7/8/07 23:28, "Matthias Wolf" <matthias.wolf@xxxxxx> wrote:
>>
>>> Hi specialists,
>>>
>>> I'm trying to pass a HP Surestore USB-drive to a domU. I'm hiding the
>>> pci-device in the dom0, capturing it in the domU, and rceive the
>>> following lines in /var/log/syslog of the dom0 after a reboot:
>>>
>>> =======================================================================
>>> Aug 8 00:04:49 localhost kernel: pciback 0000:00:1d.7: Driver tried to
>>> write to a read-only configuration space field at offset 0x54,
>>> size 2. This may be harmless, but if you have problems with your device:
>>> Aug 8 00:04:49 localhost kernel: 1) see permissive attribute in sysfs
>>> Aug 8 00:04:49 localhost kernel: 2) report problems to the xen-devel
>>> mailing list along with details of your device obtained from lspci.
>>> =======================================================================
>>>
>>> I'm not quite sure what I'm expected to do in the /sys-tree: root has
>>> write-permissions all the way down the branches.
>>>
>>> I'm using the stable version of the xen-hypervisor 3.0.3-0-2 (debian).
>>>
>>> I kind of *need* this functionality and would be very grateful for any
>>> kind of help or hint.
>>>
>>> Thanx in advance,
>>>
>>> Bests from Vienna/Austria
>>> Matthew A. Wolf
>>>
>>> pS.: THANKS a whole lot for such a fine piece of software!
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-devel
>>
>>
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