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[Xen-users] VGA Passthrough with Linux guests

I've been doing some research and have seen the success by David Techer and Teo En Ming in getting a Windows guest to work with VGA passthrough under Xen but I'm wondering if anyone has been able to get it working with a Linux guest. Specifically, I'm trying to run a RHEL 6.4 guest with a Nvidia Quadro graphics card. At the moment, I'm running XCP 6.1 which  is xen 4.1.3-1.6.10 under the covers. I'm not sure if this will work or not. I've got a hvm guest running and I've been able to assign the GPU to it. I'm at the point where the Nvidia driver loads and I can see a card in the guest with lspci, however the GPU isn't functional and I get a black screen. I think the issue may be vgabios related because if I cat /proc/driver/nvidia/gpus/0/information I get this:

Model: Quadro K5000
IRQ:   40
GPU UUID: GPU-????????-????-????-????-????????????
Video BIOS: ??.??.??.??.??
Bus Type: PCI-E
DMA Size: 32 bits
DMA Mask: 0xffffffff
Bus Location: 0000:00.06.0

If there are patches I need to make this work, I'd appreciate a pointer. I tried following Teo En Ming's document from here: 

But unfortunately, at least over the last few days, I can't get the patches referenced at http://www.davidgis.fr/download because the site is down. 

Does anyone have these patches and do you know if they can be applied to XCP 1.6?

Steven Seed
Sr Systems Engineer
Walt Disney Animation Studios
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