workaround 
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1647389/comments/15
didnt work.

I worried that if we patch this to over Q, 
I assume that live migration current running instances from current Q to 
patched Q

so I've tested some scenario

###########################
Scenario 1
###########################
Mitaka < -> Mitaka  ( 2.5 )
->
Queens ( patched, 2.11 )
->
Focal             :  FAILED
###########################

###########################
Scenario 2
###########################
Mitaka < -> Mitaka  ( 2.5 )
->
Queens ( patched, 2.11 )
->
Bionic          :  FAILED
###########################

###########################
Scenario 3 
###########################
Bionic -> Bionic( patched, 2.11 )
###########################
Bionic <-> Bionic
->
Bionic( patched )      OK
###########################

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https://bugs.launchpad.net/bugs/1894772

Title:
  live migration of windows 2012 r2 instance with virtio balloon driver
  fails from mitaka to queens.

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