[Bug 102376] New: iGPU hangs in KVM guest with GPU passthrough

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102376

            Bug ID: 102376
           Summary: iGPU hangs in KVM guest with GPU passthrough
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ebrombugs at protonmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 133720
  --> https://bugs.freedesktop.org/attachment.cgi?id=133720&action=edit
iGPU crash dump (/sys/class/drm/card0/error)

Overview: The iGPU hangs semi-randomly in a KVM virtual machine running Debian
9, with an Intel HD 530 passed through to the guest at 00:02.0 and a GTX 960M
(Optimus device, no outputs of its own) passed through to the guest at 00:04.0
with the appropriate rom file (that nouveau successfully loads) in the default
PRIME setup. 

Steps to reproduce: It's mostly random, but executing this command usually does
the trick:

1. Run
vblank_mode=0 DRI_PRIME=1 glxgears
in the aforementioned environment.

Actual results: The iGPU hangs, rendering the screen completely unresponsive,
except for the cursor which can sometimes be moved around, and is stuck in the
state (the image displayed) it was in at the moment the iGPU hanged. It
sometimes recovers, sometimes stays frozen, and sometimes (happened exactly
once to me) goes black and then displays a static, garbled (appears random)
image. 

Expected results: The iGPU should continuously stay responsive, and provide an
output for the Optimus-enabled dGPU.

Build Dates: 
i915 1.6.0 20160919
nouveau 1.3.1 20120801
Debian 4.9.30-2+deb9u3 (2017-08-06)
X.Org X Server 1.19.2

Additional Information: 
Output of lspci:

00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II]
(rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet
Controller (rev 03)
00:04.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)

Output of xrandr --listproviders:

Provider 0: id: 0x75 cap: 0xf, Source Output, Sink Output, Source Offload, Sink
Offload crtcs: 3 outputs: 3 associated providers: 0 name:modesetting
Provider 1: id: 0x3f cap: 0x5, Source Output, Source Offload crtcs: 0 outputs:
0 associated providers: 0 name:modesetting

Output of DRI_PRIME=0 glxinfo | grep "OpenGL":

OpenGL vendor string: Intel Open Source Technology Center                       
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2)         
OpenGL core profile version string: 4.5 (Core Profile) Mesa 13.0.6              
OpenGL core profile shading language version string: 4.50                       
OpenGL core profile context flags: (none)                                       
OpenGL core profile profile mask: core profile                                  
OpenGL core profile extensions:                                                 
OpenGL version string: 3.0 Mesa 13.0.6                                          
OpenGL shading language version string: 1.30                                    
OpenGL context flags: (none)                                                    
OpenGL extensions:                                                              
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 13.0.6                     
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20       
OpenGL ES profile extensions:  

Output of  DRI_PRIME=1 glxinfo | grep "OpenGL":

OpenGL vendor string: nouveau
OpenGL renderer string: Gallium 0.4 on NV117
OpenGL core profile version string: 4.1 (Core Profile) Mesa 13.0.6
OpenGL core profile shading language version string: 4.10
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 13.0.6
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 13.0.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:

Output of dmesg after crash:

http://paste,debian,net/982675

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