[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 #11 from leozinho29_eu at hotmail.com ---
Using gvt-stable-4.17 kernel it's noticeable it is more stable when compared to
other kernel versions, as 4.18.0-12 (Ubuntu Bionic Beaver HWE Edge) or drm-tip.
The Intel Windows driver version 25.20.100.6326 seems to be more unstable than
24.20.100.6136 even when using gvt-stable-4.17. 

The most stable Intel Windows driver version to me is 24.20.100.6136 and the
most stable Linux kernel version is gvt-stable-4.17.

I noticed that other, more unstable kernel version print the following message
when booting the Windows 10 guest with 25.20.100.6326:

[2612.248481] gvt: vgpu(1) Invalid FORCE_NONPRIV write 83a8 at offset 24ec

It can't be guaranteed the system is stable when the above message appears.
Under heavy load, mainly heavy memory usage, hundreds messages like:

[3803.580306] gvt: guest page write error, gpa 690814b0

Can appear on dmesg. And, with drm-tip, a kernel panic is likely to happen,
while with 4.18.0-12 and gvt-stable-4.17 it may continue working normally or
blue screen the guest, more likely to continue working when using
24.20.100.6136.

>From my experiences I would say 25.20.100.6326 is worse than 24.20.100.6136
stability-wise. The gvt-stable-4.17 kernel is better than others
stability-wise.

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