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[OpenStack Infra <1605016@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/434870
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1f48d3d83b4d5f6f9cd96ee06d2fc005635c1ff9
Submitter: Zuul
Branch:    master

commit 1f48d3d83b4d5f6f9cd96ee06d2fc005635c1ff9
Author: Sivasathurappan Radhakrishnan <siva.radhakrishnan@xxxxxxxxx>
Date:   Thu Feb 16 12:51:45 2017 +0000

    Port binding based on events during live migration
    
    Currently port binding call is made at destination compute in post live
    migration phase. This may cause network outage during post-copy as the
    virtual CPUs are paused immediately at source and unpaused at
    destination by transferring a minimum set of pages.
    
    The following domain life cycle events are emitted in this order during
    post-copy:
    
    * VIR_DOMAIN_EVENT_STARTED(destination)
    * VIR_DOMAIN_EVENT_SUSPENDED_POSTCOPY(source)--migration
      entered post-copy mode
    * VIR_DOMAIN_EVENT_RESUMED_POSTCOPY(destination)--guest
      is running on the destinaton host while some if its
      memory pages still remain on sourcehost.
    * VIR_DOMAIN_EVENT_RESUMED_MIGRATED(destination)
    * VIR_DOMAIN_EVENT_STOPPED_MIGRATED(source)--migration
      finished successfully and the destination host holds
      a complete guest state.
    
    In this change, dest host port binding activation is done when the
    following events are emitted at source for post-copy and pre-copy:
    
    * VIR_DOMAIN_EVENT_SUSPENDED_POSTCOPY
    * VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED
    
    This reduces the network outage during live migration as network switch
    is done right before VM resumes at destination.
    
    Co-Authored-By: Matt Riedemann <mriedem.os@xxxxxxxxx>
    
    Change-Id: Ic5cab99944df9e501ba2032eb96911c36304494d
    Closes-Bug: #1605016


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1605016

Title:
  Post copy live migration interrupts network connectivity

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Post copy live migration causes loss of networking for the duration of
  the post copy phase.

  Post copy live migration is implemented for the libvirt virt driver
  with qemu. It works by switching the active VM to the destination
  early (before the copy is complete) and then completes the copy using
  the post copy algorithm.

  Port rebind is done in post_live_migration_at_destination() which is
  called after the migration has completed. So the destination VM has no
  networking for the duration of the post copy phase.

  The network ports should be rebound to the destination immediately
  after the switch so the destination VM has access to its networking.

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