All those changes are in qemu 3.0 and later so there it will be covered by our 
merge of qemu 3.1
Once that is done we can consider adding the three changes linked here to the 
qemu in Bionic and Cosmic.

For your wondering "I'm not sure that fixing backward migration meets the 
criteria for an SRU.":
- it is not guaranteed to be working (not fully supported)
- but if one provides the means (fixes, howto) avoid issue we are willing to 
help getting them applied

For your wondering about "why Canonical didn't pick up the latest stable 
release":
- in the past there were issues with qemu stable releases causing issues on 
updates (this was before my time so no details).
- Due to these issues an SRU exception for those minor release updates was 
nacked by our Service folks
- in the meantime testing in general got much better so I was planning to 
suggest an SRU exception for qemu stable releases from 20.04 onwards (just 
intention so far, nothing committed into plans so far)


** Tags added: qemu-19.04

** Also affects: qemu (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu)
       Status: New => In Progress

** Changed in: qemu (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Cosmic)
       Status: New => Triaged

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1809083

Title:
  [Ubuntu 18.04] Backward migration of Ubuntu 16.04.4 P8 guest from
  Ubuntu 18.04 P9 Host -> Ubuntu 16.04.4 P8 host is broken

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