[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 #14 from leozinho29_eu at hotmail.com ---
Using kernel version
4.20.0-rc6-drm-tip-1f86f1fb70f082ed93450c328e518d8013d23953+ and Mesa
19.0.0-devel (git-7fe4e0ad5d), the Windows 10 guest is crashing with
(excessively?) heavy workloads: 

Thousands of gvt: guest page write error until:

[24491.723061] gvt: guest page write error, gpa 7bf0ea60
[24491.723073] gvt: guest page write error, gpa 7bf0ea50
[24491.723111] gvt: guest page write error, gpa 7bf0ea40
[24491.723133] gvt: vgpu 1: fail: shadow page 00000000fe42efcf guest entry
0xc18166088b18458d type 8
[24491.723136] gvt: vgpu 1: fail: spt 0000000047b0f9c1 guest entry
0xc18166088b18458d type 8
[24491.723138] gvt: vgpu 1: fail: shadow page 0000000047b0f9c1 guest entry
0xc18166088b18458d type 8.
[24491.723140] gvt: guest page write error, gpa 7bf0ea38

More thousands of gvt: guest page write error until:

[24729.598263] gvt: guest page write error, gpa 7bf0efff
[24732.170539] gvt: vgpu 1: fail: shadow page 000000008652efc7 guest entry
0x616c430267006c61 type 7
[24732.170546] gvt: vgpu 1: fail: shadow page 0000000081a744b4 guest entry
0x616c430267006c61 type 7
[24732.170551] gvt: vgpu 1: fail: shadow page 0000000081a744b4 guest entry
0x7cd3a045 type 8
[24732.170554] gvt: vgpu 1: fail: spt 0000000047b0f9c1 guest entry 0x7cd3a045
type 8
[24732.170556] gvt: vgpu 1: fail: shadow page 0000000047b0f9c1 guest entry
0x7cd3a045 type 8.
[24732.170558] gvt: vgpu 1: fail to flush post shadow
[24732.170568] gvt: vgpu 1: fail to dispatch workload, skip
[24754.835553] gvt: vgpu mm pin count bug detected

And the iGVT-g guest crashes.

The host seems better as there are no longer GPU hangs happening on it, at
least I can't reproduce them, but the guest is still crashing, not as often as
before and only under heavy workloads.

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