[Bug 110951] New: GPU hang while using kvmgt

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110951

            Bug ID: 110951
           Summary: GPU hang while using kvmgt
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: velde666 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144598
  --> https://bugs.freedesktop.org/attachment.cgi?id=144598&action=edit
GPU crash dump

Hi there,

I am running CentOS 7 on an Intel NUC7i3BNH with with KVM/QEMU using GPU
virtualization passthrough to a Windows 10 VM. 

Kernel is 5.1.9 compiled with merged configs from standard CentOS kernel 3.10.x
and 5.1.9 kernel-ml from elrepo-kernel.

I am getting random bluescreen in Windows (also with standard CentOS 3.10.x
kernels) and kernel messages containing "gvt: guest page write error" and "gvt:
vgpu(1) Invalid FORCE_NONPRIV write" and "gvt: vgpu 1: fail: spt" and "gvt:
vgpu 1: fail: shadow page" and others as well as 

Jun 16 13:38:30 floor13 kernel: [drm] GPU hangs can indicate a bug anywhere in
the entire gfx stack, including userspace.
Jun 16 13:38:30 floor13 kernel: [drm] Please file a _new_ bug report on
bugs.freedesktop.org against DRI -> DRM/Intel
Jun 16 13:38:30 floor13 kernel: [drm] drm/i915 developers can then reassign to
the right component if it's not a kernel issue.
Jun 16 13:38:30 floor13 kernel: [drm] The gpu crash dump is required to analyze
gpu hangs, so please always attach it.
Jun 16 13:38:30 floor13 kernel: [drm] GPU crash dump saved to
/sys/class/drm/card0/error

which is why I am here :)

I will attach kernel messages containing gvt stuff as well as the GPU crash
dump.

Thanks in advance for your much appereciated work!

Alex

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