[fedora-virt] GPU Passthrough problem

[Alex Williamson]

On Mon, 2014-02-17 at 10:15 -0500, Cole Robinson wrote:
> On 02/17/2014 02:58 AM, Eric Viseur wrote:
> > Hello everyone,
> > 
> > As many other before me, I'm having problems with GPU Passthrough.  I'm
> > running Fedora 20 with kernel 3.13.3 and the packages from the virt-preview.
> > My configuration is a Dell OptiPlex 7010, equipped with a Core i5 3470 and a
> > Radeon HD7570 from Dell.
> > 
> > VT-d and vfio work fine for other devices, such as the audio controller, but I
> > can't seem to passthrough the graphic cards.  Primary passthrough simply
> > fails, secondary passthrough with a Cirrus VGA gives me Error 10.  In both
> > cases, I hear the GPU fan reacting when the VM boots, but then nothing happens.
> > 
> > I tried blacklisting completely the i915 driver, as I can live without it. 
> > This is for a project aimed at a seamless interaction with a Windows VM, the
> > Linux hypervisor doing background processing, hidden from the user.  Given my
> > situation, what are my best next shots ?
> > 
> 
> I'd recommend trying qemu.git as well, this stuff is still under active
> development.
> 
> Also see this thread for some possibly related discussion:
> https://lists.fedoraproject.org/pipermail/virt/2013-December/003911.html
> 
> But maybe Alex has more suggestions.

The archlinux forums linked in the above is the best source of
information, but it's currently down.  In short, there is no
out-of-the-box solution for assignment of consumer VGA cards.  Much of
the code is upstream, but there are still pieces like i915 vga arbiter
support that require patches.  Thanks,

Alex