[Xen-devel] Xen primary VGA pass through problems

[Ferdinand Nölscher <ferdinand@xxxxxxxxxxx>]

Hi!

Recently, I tried setting up VGA pass through with my machine. The set 
up is as follows:
I have two AMD vga adapters - I want to pass through the second one.

I compiled xen 4.2 from source and set everything up.
Attached to this message, you can find my windows 7 domU configuration file.

Whenever I want to pass through the device, I use "xl pci-assignable-add 
BDF" to unbind the adapter, before I create the domU. Pciback is loaded 
as module and is not compiled statically in the kernel.
Unless I do not specify "gfx_passthru = 1" in my configuration file, 
this works fine. The vga adapter gets detected and I can use it as 
secondary vga, with very limited performance.
If I do set "gfx_passthru = 1" the domU doesnt boot at all. It just 
switches state from "r" (for running) to "-----" (which is nothing, i 
guess?) every few seconds. I can't find anything in the logs indicating 
an error.
Any ideas on how to fix that?

kind regards,
Ferdinand

Attachment: win7-vga.cfg
Description: Text document

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