Verified - boot tested both cosmic & bionic proposed kernels on a D06

** Tags removed: verification-needed-bionic verification-needed-cosmic
** Tags added: verification-don-bionic verification-done-cosmic

** Tags removed: verification-don-bionic
** Tags added: verification-done-bionic

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  Avoid potential memory corruption on HiSilicon SoCs

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
Status in linux source package in Disco:
  Fix Released

Bug description:
  There is a potential for memory corruption in MSI payloads. For reasons 
mentioned in the commit message, this happens to not be triggerable today, but 
is fragile, and could rear it's ugly head if a struct layout changes due to 
other backports in the future.

  [Test Case]

  84a9a75774961 iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI 

  [Regression Risk]
  The fix is to add some explicit padding into an internal structure. This 
padding is already implicit today.

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