[vfio-users] Unable to start VM, BUG: unable to handle kernel NULL pointer dereference at 0000000000000501

[Brett Profitt]

I'm running QEMU 3.1 on Ubuntu (kernel 5.0.0-15-lowlatency) and receive the
following error when starting a VM with a passed through video card:

Jun  2 17:43:17 livingroom kernel: [  138.519329] BUG: unable to handle
kernel NULL pointer dereference at 0000000000000501
Jun  2 17:43:17 livingroom kernel: [  138.519332] #PF error: [normal kernel
read fault]
Jun  2 17:43:17 livingroom kernel: [  138.519333] PGD 0 P4D 0
Jun  2 17:43:17 livingroom kernel: [  138.519335] Oops: 0000 [#1] PREEMPT
SMP NOPTI
Jun  2 17:43:17 livingroom kernel: [  138.519336] CPU: 11 PID: 1499 Comm:
kworker/11:3 Tainted: P           OE     5.0.0-15-lowlatency #16-Ubuntu

Full dmesg trace: https://pastebin.com/ZaeqtKM2

The card I am passing through is an MSI Nvidia 2080 Ventus on a Gigabyte
Z390 Aorus Ultra.

There is a similar report [1], but the issue was related to USB, and mine
seems related to snd_hda_codec_hdmi.

Any suggestions on how to correct this behavior?

Thanks,
Brett

[1] https://www.redhat.com/archives/vfio-users/2018-February/msg00030.html
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