The changeset referenced in Comment #8 was part of a 21-part changeset shown 
here:
  https://patches.linaro.org/cover/141739/

I was able to backport these changes to our 4.15 kernel and get it
booting w/ the MDS workaround enabled. One option is to SRU those (and a
number of follow-up Fixes: changes for them). Presumably that's of some
security benefit, though I'm not sure how significant of one. It also
isn't clear exactly why those changes are needed for compat with the
firmware MDS workaround.

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https://bugs.launchpad.net/bugs/1931728

Title:
  [scalingstack bos01] bionic (arm64) instances always fail to boot on
  eMAGs in this cloud

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