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Total time of a migration and total downtime transfered from a source to a destination host do not count with the transfer time to the destination host and with the time elapsed before guest CPUs are resumed. Thus, source libvirtd remembers when migration started and when guest CPUs were paused. Both timestamps are transferred to destination libvirtd which uses them to compute total migration time and total downtime. Obviously, this requires the time to be synchronized between the two hosts. The reported times are useless otherwise but they would be equally useless if we didn't do this recomputation so don't lose anything by doing it. Signed-off-by: Jiri Denemark <jdenemar@redhat.com>