Public bug reported:

I'm using MAAS to enable the following kernel flags on install/boot:

  iommu=pt intel_iommu=on

in order to be able to passthrough SR-IOV VF functions to KVM guess;
however when these options are enabled, the servers fail to install (see
attached screenshot).

The install eventually fails - it looks like the writes back to one of
the disks starts to fail for some reason.

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

** Attachment added: "DMAR error.png"
   
https://bugs.launchpad.net/bugs/1641593/+attachment/4777240/+files/DMAR%20error.png

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https://bugs.launchpad.net/bugs/1641593

Title:
  unable to enable iommu on HPE Proliant Gen9 server

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