From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 196409] kvm_amd nested pagetable gpu passthrough performance
 oddities
Date: Tue, 24 Oct 2017 23:42:42 +0000
Message-ID: <bug-196409-28872-NP3x20j6EH@https.bugzilla.kernel.org/>
References: <bug-196409-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=196409

--- Comment #34 from Nick Sarnie (commendsarnex@gmail.com) ---
Hi all,

Just a quick update. A workaround has been found. Please see the following
post:
https://lists.linuxfoundation.org/pipermail/iommu/2017-October/024823.html

Please note that this patch is only a workaround, is incorrect in some cases
and cannot be merged upstream in this form. But, it's a start and you can make
this change locally to workaround the GPU performance hit.


Thanks,
Sarnex

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