** Changed in: linux (Ubuntu Zesty)
Assignee: Tim Gardner (timg-tpi) => (unassigned)
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https://bugs.launchpad.net/bugs/1634050
Title:
Please enable CONFIG_VFIO_NOIOMMU
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Zesty:
Fix Committed
Bug description:
Hi,
for certain cases a user might want to use VFIO in NO IOMMU mode.
This only enables it to be an option, it doesn't change things unless
"enable_unsafe_noiommu_mode" is set. See this reference:
https://patchwork.kernel.org/patch/7906971/ for more details.
This is used for some setups of DPDK see this http://dpdk-
guide.gitlab.io/dpdk-guide/setup/binding.html#vfio-no-iommu
Usually the reason to pick vfio over uio is the isolation. But there
are some cases where vfio is required for extra features but can't
work unless NO-IOMMU mode is used.
I watched the topic a while checking if there is some major "oh crap
what have we done" but there was none. An since by only enabling it in
the kernel it shouldn't change a lot I wanted to ask if you could
enable this config in the kernel for Z*.
Technically it would be nice to get it in Yakkety as well, but I think
we should be fine only working forward and enabling it in the Z
release.
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