While investigating a bug [1] found by Xen's osstest I realized I don't quite
understand how to handle modify jobs (e.g. BeginJob/EndJob) on virDomainObj
across the various phases of V3 migration protocol. E.g. on the src host the
Begin, Perform, and Confirm phases are performed. Should a modify job start
(BeginJob) in the Begin phase and stop (EndJob) in the Confirm phase? Or should
each phase, if necessary, do BeginJob/EndJob? Same question for dst host. IMO
the job should be held across the phases on each host, preventing any
modifications during the overall migration process. Although I do worry about
orphaned jobs, e.g. a missed EndJob caused by some obscure error in the
migration machinery.
Regards,
Jim
[1] https://lists.xenproject.org/archives/html/xen-devel/2018-08/msg01945.html
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