------- Comment From pa...@de.ibm.com 2020-03-25 10:35 EDT-------
Verificattion: looks good!

** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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  [UBUNTU 20.04] virtio-blk disks can go dissfunctional when swiotlb
  fills up

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  virtio-blk disks can go dissfunctional when swiotlb fills up
  virtio-blk hw queue gets possibly permanently stopped when swiotlb full

  For example, with a PV guest choose a small swiotlb (30MB) and create
  IO load on several virtio-blk disks simultaneously. It actually should
  not matter what causes the swiotlb pressure (can be virtio-net as

  Fixes posted upstream:

  We will need backports to support Protected Virtualization.

  IBM verified that the patches apply cleanly on focal/master-next,
  upstream commit ids for reference:

  commit bab7e6f05699a481787f7659c4f766dd87187dae
  Author: Halil Pasic <pa...@linux.ibm.com>
  Date:   Thu Feb 13 13:37:27 2020 +0100

      virtio-blk: fix hw_queue stopped on arbitrary error

  commit 24506976aec92052e9fe328146a2e574a1190986
  Author: Halil Pasic <pa...@linux.ibm.com>
  Date:   Thu Feb 13 13:37:28 2020 +0100

      virtio-blk: improve virtqueue error to BLK_STS

  Also applies cleanly on 19.10.....

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