Public bug reported:

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: for more details.

This is used for some setups of DPDK see this http://dpdk-

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.

** Affects: dpdk (Ubuntu)
     Importance: Medium
         Status: Incomplete

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Also affects: dpdk (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: dpdk (Ubuntu)
       Status: New => Triaged

** Changed in: dpdk (Ubuntu)
       Status: Triaged => Incomplete

** Changed in: dpdk (Ubuntu)
   Importance: Undecided => Medium

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