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Re: [Xen-devel] Xen primary VGA pass through problems

Am Sonntag 14 Oktober 2012, 12:09:14 schrieb Ferdinand Nölscher:
> 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

Hi Ferdinand,

can you try with gfx_passthru = 0 and eject the device after booting domu?
the secondary amd should show up within the devicemanager icon in the taskbar, 
there you can eject it.

Here this trick helps for the poor performance problem - although this only 
shows up after a domU reboot - performance is fine until the first domu reboot 
here, so i wonder if this tricks helps with our scenario...


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