[Xen-API] XCP 1.6 and GPU passthrough

[Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxxxx>]

Hello,

I'm running XCP 1.6 and I installed an ubuntu 12.04.02 as a VM. My 
machine has two GPU M2070Q and I'd like to do PCI passthrough to allow 
my VM to use those GPUs.
I modified the /boot/extlinux.conf to add the option 
"xen-pciback.hide=(02:00.0)(02:00.1)(83:00.0)(83:00.1)" as 
PCIDEV_BACKEND is built in the kernel (according to 
/boot/config-2.6.32.43-0.4.1.xs1.6.10.734.170748xen
I rebooted XCP but when I run lspci in dom0, pci devices 02:... and 
83:... are still listed.
I set parameter other-config in my VM by doing:
xe vm-param-set 
other-config:pci=0/0000:02:00.0,0/0000:02:00.1,0/0000:83:00.0,0/0000:83:00.1 
uuid=b6fcf...
But when I start the VM I got the following error:

The server failed to handle your request, due to an internal error.  
The given message may give details useful for debugging the problem.
message: xenopsd internal error: Xenctrl.Error("38: Function not implemented")

I tried to replace xen-pciback.hide= by pciback.hide= as I saw both on 
google but both have the same effect.
Any hints? I also like to know if someone already achieve to do PCI 
passthrouhg with a 3D graphic card on XCP 1.6? If yes can I have its 
recipe :)
Thanks everyone for you help,
Best regards,

Guillaume


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