Closing this ticket (setting to Invalid, since it's about cosmic).
A new ticket got opened that addresses this issue specially for disco: LP 
1841984
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1841984

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

** Changed in: ubuntu-power-systems
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1841488

Title:
  [Ubuntu18.10][Backport] Crypto VMX Fixes

Status in The Ubuntu-power-systems project:
  Invalid
Status in linux package in Ubuntu:
  Invalid

Bug description:
  Cosmic is missing the fix for "5c380d623ed3 - crypto: vmx - Add
  support for VMS instructions by ASM (4 years, 5 months ago) <Leonidas
  S. Barbosa>" ... which is fixed by 'crypto: vmx - fix copy-paste error
  in CTR mode', it fixes a couple of incorrect branch targets, and usage
  of an incorrect vector assembly instruction.

  The others two patches ("crypto: vmx - CTR: always increment IV as
  quadword ", "crypto: vmx - ghash: do nosimd fallback manually ") fixes
  for ghash replaces the fallback mechanism that is used on powerpc an
  operation is required to operate in interrupt context.

  These fixes are important to avoid a potential data integrity issue.

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