[CentOS-virt] PCI Passthrough not working

[Francis Greaves]

Further to my last post, I have removed the xen-pciback module from the Dom0 kernel, and reloaded it as 
modprobe xen-pciback passthrough=1 

I now have the PCI device on the DomU matching the Dom0 Device 
usb usb1: SerialNumber: 0000:00:1a.0 
instead of 0000:00:00.0 

However I now have this error 

ehci_hcd 0000:00:1a.0: Unlink after no-IRQ? Controller is probably using the wrong IRQ. 

does this give a clue as to what is going on? 

Many thanks 
Francis 
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