[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 #4 from leozinho29_eu at hotmail.com ---
Created attachment 142077
  --> https://bugs.freedesktop.org/attachment.cgi?id=142077&action=edit
dmesg

Using in the guest: 

-Intel driver version 25.20.100.6326;
-Windows 10 18-03 x86_64;

In the host:

-Xubuntu 18.04.1 x86_64;
-Kernel 4.17.19 patched to fix
https://bugs.freedesktop.org/show_bug.cgi?id=107899 ;
-QEMU 3.0.0;
-Mesa 18.3.0-devel (git-58a51d0a67);

The guest seems stable. The workloads that were causing the issues I reported
here no longer cause problems. It seems as stable as when using driver
25.20.100.6136.

The only new thing I noticed were two QEMU errors in the terminal:

qemu-system-x86_64:
vfio_region_write(123f09b0-4c00-11e8-a6ca-f3c21e47e012:region0+0x24ec,
0x83a8,4) failed: Endereço inválido
qemu-system-x86_64:
vfio_region_write(123f09b0-4c00-11e8-a6ca-f3c21e47e012:region0+0x24ec,
0x83a8,4) failed: Endereço inválido

"Endereço inválido" means "Invalid address". The first one appeared when
upgrading the drivers and the second on reboot. dmesg is red with messages as:

[14200.651340] gvt: guest page write error, gpa 11c643e90

which was generated when upgrading the driver. And:

[14411.555755] gvt: vgpu 1: untracked MMIO 00004084 len 4

which appears in multiple circumstances as resolution changes. 4.18 and newer
don't have this messages but
https://bugs.freedesktop.org/show_bug.cgi?id=107945 is still present with
4.19-rc8 and drm-tip.

The Windows 10 guest using iGVT-g is running very well, nearly everything I
tried worked on it as it worked on Windows 10 host, only with a bit of
overhead.

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