[Bug 107475] [iGVT-g][SKL] GPU Hang and iGVT-g guest crash under certain loads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107475

--- Comment #13 from Webi <martin.weber at secunet.com> ---
Created attachment 142813
  --> https://bugs.freedesktop.org/attachment.cgi?id=142813&action=edit
dmesg & /sys/class/drm/card0/error

I can also confirm a GPU hang with the following setup:

* CPU: Core i7 7700T (Intel Graphics HD 620)
* host kernel: 4.20.0-rc3 (gvt-linux/gvt-next branch) - arguments:
i915.enable_gvt=1 kvm.ignore_msrs=1 intel_iommu=on drm.debug=0
  (gvt-stable-4.17 did not work due to unsupported 2MiB GTT)
* host os: Ubuntu 18.04.1 amd64
* guest os: Windows 10 Pro 1803 Build 17134.1 x86_64
* guest GFX driver: Intel HD Graphics 630 25.20.100.6444
* QEMU: 3.1.0 (IGD Assignment: Legacy mode) - arguments:
 -machine type=q35,accel=kvm,kernel_irqchip=on
 -cpu host
 -bios /usr/bin/bios.bin
 -drive
if=virtio,file=.../Windows10.qcow2,aio=native,cache.direct=on,l2-cache-size=8M
 -smp 4,cores=4
 -m 4G
 -enable-kvm
 -object rng-random,id=rng0,filename=/dev/urandom
 -device virtio-rng-pci,rng=rng0
 -monitor stdio
 -device qemu-xhci,id=xhci
 -device usb-tablet
 -M graphics=off
 -vga none
 -display gtk,gl=on
 -device
vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/97d40b8a-f89d-11e8-a95f-4ff9be8f1398,display=on,x-igd-opregion=on
* vGPU with WUXGA resolution (i915-GVTg_V5_4)
* Mesa: 18.0.5-0ubuntu0~18.04.1

Steps for reproduction:

* The GPU hang occurs after some seconds playback of a YouTube video
(https://www.youtube.com/watch?v=I4WIYzizbAs) in Chrome in Full-HD resolution
on an vGPU within a Windows 10 guest.

Do you have any suggestions?

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