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...nchronized between cpus. It also uses sched_clock to measure the time a task spends sleeping, in which case "unstolen time" isn''t meaningful. So just use plain xen_clocksource_read to return wallclock nanoseconds for sched_clock. 2.6.36 does not work, since 489fb49 and e7a3481 are missing: Without the "global synchonization point for pvclock" (AKA last_value) plus the fix to "reset it to 0 on resume" VMs migrate fine in the opposite direction (older=higher uptime → newer=lower uptime), but the original direction (lower→higher) now stal...