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[Xen-users] VGA Passthrough in Xen 4.4

Having updated from 4.1 to 4.4 I am now using the xl toolstack, and it seems
that there is a bug dealing with VGA passthrough. I have a Windows guest and
can get the card to show up, however it throws the error

"If you want to use this device, you will need to disable one of the other
devices on this system."

qemu's log shows

"pt_pci_read_config: [00:05:0] Error: Failed to read register with invalid
access size alignment. [Offset:0eh][Length:4]"

There seem to be plenty of instances of this around the internet, however as
far as I have found, there is no solution.

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