[Bug 196409] kvm_amd nested pagetable gpu passthrough performance oddities

bugzilla-daemon
2017-10-24T23:42:50Z

--- 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