On this platform strace still confirms the same paths:
And perf as well (slight arch differences, but still mem setup).
  46.85%  [kernel]                         [k] lruvec_lru_size
  16.89%  [kernel]                         [k] clear_user_page
   5.74%  [kernel]                         [k] inactive_list_is_low.isra.0
   4.48%  [kernel]                         [k] find_next_bit
   3.74%  [kernel]                         [k] cpumask_next
   2.72%  [kernel]                         [k] copypage_power7
   2.40%  [kernel]                         [k] kvm_age_rmapp
   1.94%  [kernel]                         [k] snapshot_refaults
   1.28%  [kernel]                         [k] shrink_page_list

Note: This is 5.2.0-10-generic

Also cross arch, as soon as no hostdev is passed the init can be
skipped. the 75 seconds above drop down to the ~7 seconds I have seen
before the single thread init starts.

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https://bugs.launchpad.net/bugs/1838575

Title:
  passthrough devices cause >17min boot delay

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