[Xen-users] How to export an Intel USB-Controller to DomU / Driver tried to write to a read-only configuration space

[Franz Von Hahn <franz.vonhahn@xxxxxxxx>]

Hey List!

I'm using Fedora 8 (since Fedora 9 doesn't support Dom0-mode), and i'm really 
stuck. I want to export an Intel ICH7-USB-Controller to a DomU to attach some 
devices. 

When I want to export the device i go this way:
rmmod uhci_hcd
rmmod ohci_hcd
rmmod ehci_hcd
modprobe pciback
echo -n 0000:00:1d.0 > /sys/bus/pci/drivers/pciback/new_slot
echo -n 0000:00:1d.0 > /sys/bus/pci/drivers/pciback/bind
echo -n 0000:00:1d.7 > /sys/bus/pci/drivers/pciback/new_slot
echo -n 0000:00:1d.7 > /sys/bus/pci/drivers/pciback/bind

as lspci says the following:

00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI 
Controller #1 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI 
Controller (rev 01)

Then I fire up the dom0 with

pci = ['00:1d.0','00:1d.7'] in the config file

Then I check dmesg, which says:

pciback 0000:00:1d.0: Driver tried to write to a read-only configuration space 
field at offset 0xc0, size 2. This may be harmless, but if you have problems 
with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of your 
device obtained from lspci.


I've tried to do before fireing up the domU
echo -n 0000:00:1d.0 > /sys/bus/pci/drivers/pciback/permissive
echo -n 0000:00:1d.7 > /sys/bus/pci/drivers/pciback/permissive
Then i fired up the domU and then the whole system got stuck, no chance to see 
any messages



So what can I do to get USB working in the domU? Isn't it possible, to reserve 
a config space for the driver anywhere?

IDs are: 
0000:00:1d.0 => Vendor: 0x8086, Device: 0x27c8
0000:00:1d.7 => Vendor: 0x8086, Device: 0x27cc

 
Many Thanks!!!


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