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Re: [Xen-devel] [Xen-users] VGA passthough still not working

On Mon, Jan 23, 2012 at 12:45:05PM +0100, Sandi Romih wrote:
> Hi John,
> I am trying to pass my secondary graphics card through to the VM. My dom0
> runs with the primary card (an onboard GPU).
> What happens with me is that the secondary card (GTX480) is relinquished to
> pciback and according to the logs, it looks like the card is passed through
> successfully to the domU.
> What happens though is a bit puzzling (with gfx_passthru=1):
> 1) When I start the domU, my dom0 screen goes blank (which is using a
> different graphics card than is assigned to the domU)
> 2) The domain does not boot; i.e. the CDROM does not spin up.
> 3) If I connect to the domain via vnc, I see only the qemu console.
> With gfx_passthru=0, the following happens:
> a) The domain boots fine (the CDROM spins up).
> b) I can connect to the OS in the domain via vnc.
> c) The Windows OS installs fine and functions fine afterwards too.
> d) I can see the GFX480 card in the device manager, but I can not use the
> device (even if I install the correct drivers for it)

So you are using Nvidia. And those seem to require some extra patches.
Look for the vBar=pBar or so.

> Check out the details of my problem
> here<http://lists.xen.org/archives/html/xen-devel/2012-01/msg01626.html>.
> I have marked the things that concern me in red. I am obviously missing
> something...

Did you look at David Techer postings? He has been doing extensive work
in this area.

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