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smp-core-2022-05-23

smp-core-2022-05-23: Updates for CPU hotplug:
tagged this 23 May 07:37 
  - Initialize the per CPU structures during early boot so that the state
    is consistent from the very beginning.

  - Make the virtualization hotplug state handling more robust and let the
    core bringup CPUs which timed out in an earlier attempt again.

  - Make the x86/XEN CPU state tracking consistent on a failed online
    attempt, so a consecutive bringup does not fall over the inconsistent
    state.
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