Re: Problem passing a HP-DAT (USB) device to domU

[Matthias Wolf <matthias.wolf@wot.at>]

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@wot.at> 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@lists.xensource.com
>> http://lists.xensource.com/xen-devel
> 
>