[Xen-devel] getting graphics passthrough to work

[Alexia Benington <alexbenington@xxxxxxxxx>]

Hi,

Is there anything that I should take note of for gfx passthrough in
the latest Xen unstable? I followed mostly the instructions from
http://wiki.xensource.com/xenwiki/VTdHowTo.

I tried doing pciback.hide on 01:00.0 (gfx), and was able to see it in
/sys/bus/pci/drivers/pciback. "dmesg | grep pci" also showed the
device being seized. I would have expected that I won't be able to see
anything on my screen, which wasn't the case (I did notice losing the
screen in an earlier version of Xen unstable). I tried to assign the
device to DomU by "pci=['01:00.0']". But lspci wasn't able to see the
device in DomU. However, when I shutdown DomU, my screen went blank.
My serial connection and ssh is still up though. Somehow, I think this
isn't the expected behavior, or am I wrong?

Btw, I'm using a Intel DQ45CB and HD2600XT. I've explicitly selected
PCIe card in the BIOS. This is my lspci.

00:00.0 Host bridge: Intel Corporation Unknown device 2e10 (rev 03)
00:01.0 PCI bridge: Intel Corporation Unknown device 2e11 (rev 03)
00:03.0 Communication controller: Intel Corporation Unknown device 2e14 (rev 03)
00:03.2 IDE interface: Intel Corporation Unknown device 2e16 (rev 03)
00:03.3 Serial controller: Intel Corporation Unknown device 2e17 (rev 03)
00:19.0 Ethernet controller: Intel Corporation Unknown device 10de (rev 02)
00:1a.0 USB Controller: Intel Corporation Unknown device 3a67 (rev 02)
00:1a.1 USB Controller: Intel Corporation Unknown device 3a68 (rev 02)
00:1a.2 USB Controller: Intel Corporation Unknown device 3a69 (rev 02)
00:1a.7 USB Controller: Intel Corporation Unknown device 3a6c (rev 02)
00:1b.0 Audio device: Intel Corporation Unknown device 3a6e (rev 02)
00:1d.0 USB Controller: Intel Corporation Unknown device 3a64 (rev 02)
00:1d.1 USB Controller: Intel Corporation Unknown device 3a65 (rev 02)
00:1d.2 USB Controller: Intel Corporation Unknown device 3a66 (rev 02)
00:1d.7 USB Controller: Intel Corporation Unknown device 3a6a (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a2)
00:1f.0 ISA bridge: Intel Corporation Unknown device 3a14 (rev 02)
00:1f.2 SATA controller: Intel Corporation Unknown device 3a02 (rev 02)
00:1f.3 SMBus: Intel Corporation Unknown device 3a60 (rev 02)
00:1f.5 IDE interface: Intel Corporation Unknown device 3a06 (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc Unknown device 9588
01:00.1 Audio device: ATI Technologies Inc Unknown device aa08
02:01.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 70)

Would appreciate any suggestions or comments. Thank you and have a good day.

Rgds,
Alex

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