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<body><span class="vcard"><a class="email" href="mailto:christian.ehrhardt@canonical.com" title="Christian Ehrhardt <christian.ehrhardt@canonical.com>"> <span class="fn">Christian Ehrhardt</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Crashes when using MDEV passthrough on i915"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110238">bug 110238</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Crashes when using MDEV passthrough on i915"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110238#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Crashes when using MDEV passthrough on i915"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110238">bug 110238</a>
from <span class="vcard"><a class="email" href="mailto:christian.ehrhardt@canonical.com" title="Christian Ehrhardt <christian.ehrhardt@canonical.com>"> <span class="fn">Christian Ehrhardt</span></a>
</span></b>
<pre>Hi,
thanks for your feedback.
I was experimenting more on the case actually and I found that sometimes it
just doesn not show up even after quite some time. But there was a way to
"force" the issue (which is on the host) from the guest.
To do so install opencl bits and try to use it, that would be:
$ sudo apt install ocl-icd-libopencl1
$ sudo apt install opencl-headers
$ sudo apt install clinfo
$ sudo apt install beignet
And then run clinfo
$ clinfo
So far this triggered the bug immediately in all my tests.
With that set up to ensure I can actively trigger it I tried the suggested
intel_iommu=igfx_off.
That works like a charm in my setup - thanks!
With intel_iommu=igfx_off I can even run accelerated opencl load in the guest
on the mdev.
But since [1] states about that "If this fixes anything, please ensure you file
a bug reporting the problem." I think I might need to file a bug in a different
place - maybe for iommu itself then.
Thanks - we can close this bug and I'll look for a place to file that iommu
bug.
[1]: <a href="https://www.kernel.org/doc/Documentation/Intel-IOMMU.txt">https://www.kernel.org/doc/Documentation/Intel-IOMMU.txt</a></pre>
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