Public bug reported:

Hello Canonical,

Could you please include the following patch in Bionic?

When setting up a CPU, we "push" (activate) a pool VP for it.

However it's an error to do so if it already has an active
pool VP.

This happens when doing soft CPU hotplug on powernv since we
don't tear down the CPU on unplug. The HW flags the error which
gets captured by the diagnostics.

Fix this by making sure to "pull" out any already active pool


** Affects: ubuntu-power-systems
     Importance: Medium
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: Triaged

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Tags: architecture-ppc64le bugnameltc-166669 severity-medium 
targetmilestone-inin1804 triage-g

** Tags added: architecture-ppc64le bugnameltc-166669 severity-medium

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 

** Package changed: ubuntu => linux (Ubuntu)

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  Fix trying to "push" an already active pool VP

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