Public bug reported:

This s an issue found while testing for a planned update.
Filing it as bug to work together on it.


(U) = Updated to the new version
(O) = orig version as in the archive now

Migrations fails from old versions to the new Disco version:
 - Cosmic (O) -> Disco (U) -> fail
 - Disco (O) -> Disco (U) -> fail
Migration works in other cases where the same backport should be active:
 - Bionic (O) -> Bionic (U) -> works
Also it works if both peers of the migration are updated
 - Disco (U) -> Disco (U) -> works
The same worked without the update
 - Disco (O) -> Disco (O) -> works
And the same code in later versions work as well:
 - Disco (U) -> Eoan (O)

The case that fails is the recently added host-model migration check, so there 
might be soemthing we miss so far in the test setup.

$ virsh migrate --unsafe --live kvmguest-disco-normal 
error: internal error: process exited while connecting to monitor: 
2019-07-11T21:33:29.584326Z qemu-system-x86_64: can't apply global Property '.md-clear' not found

TL;DR of the case:
1. Get two Disco systems (x86)
2. one system has the base version, one the new version of qemu
3. start a guest with type "host-model"
4. migrate that guest between the two systems

** Affects: qemu (Ubuntu)
     Importance: Undecided
     Assignee: Rafael David Tinoco (rafaeldtinoco)
         Status: Confirmed

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

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  Migration with Host model fails to set md-clear (not yet released in

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