[Bug 73834] Launch of Qemu VM (with kvm/vfio/iommu/pci-stub) causes [drm:intel_uncore_check_errors] *ERROR* Unclaimed register before interrupt

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73834

--- Comment #1 from Dave Jopson <duggum at gmail.com> ---
Sorry, hit save before I was finished...

I am trying to run a Qemu virtual machine using kvm/iommu/vfio/pci-stub with a
discreet nVidia GTX-650 bound using vfio, and whenever I launch the virtual
machine, I get the following error:

[drm:intel_uncore_check_errors] *ERROR* Unclaimed register before interrupt

and the VM fails to fully launch.

If I apply the patch attached as i915.patch, the VM launches fine, but I lose
hardware acceleration as my graphics driver does not load and the Gallium GLX
renderer takes over instead of Mesa DRI.

I have attached my dmesg with drm.debug=0xe set. One is before I launch the VM,
and the other is after. I have also included (system-data.txt) the output of
inxi -F and vainfo.

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