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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Changed in: nova/train
       Status: New => In Progress

** Changed in: nova/train
     Assignee: (unassigned) => Boris Bobrov (bbobrov)

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https://bugs.launchpad.net/bugs/1845986

Title:
  SEV does not enable IOMMU on SCSI controller

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) train series:
  In Progress

Bug description:
  https://review.opendev.org/#/c/644565/ added logic to
  libvirt/designer.py for enabling iommu for certain devices where
  virtio is used.  This is required for AMD SEV[0].  However it missed
  the case of a SCSI controller where the model is virtio-scsi, e.g.:

      <controller type='scsi' index='0' model='virtio-scsi'>

  As with other virtio devices, here a child element needs to be added
  to the config when SEV is enabled:

      <driver iommu="on" />

  [0] http://specs.openstack.org/openstack/nova-
  specs/specs/train/approved/amd-sev-libvirt-support.html#proposed-
  change

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