Hi, I'm trying to figure out how a guest OS can get a monotonic clock using KVM's paravirtual clock. At first, I thought that the clock I get using KVM_SYSTEM_TIME is a monotonic clock, based on the host's monotonic clock. But I'm no longer sure this is actually done correctly: 1. What happens on live migration? On the new host, will the KVM_SYSTEM_TIME continue from the same point? Or will it jump because KVM_WALL_CLOCK (the wall time during boot) is different on the new host? 2. What happens when the wall-clock time is set on the host? I was hoping that only KVM_WALL_CLOCK changes and KVM_SYSTEM_TIME doesn't, but am no longer sure this is actually the case. If KVM_SYSTEM_TIME is not a correct way to get a monotonic paravirtual clock from KVM, is there a correct way? Thanks, Nadav. -- Nadav Har'El | Monday, Jan 20 2014, 19 Shevat 5774 nyh@xxxxxxxxxxxxxxxxxxx |----------------------------------------- Phone +972-523-790466, ICQ 13349191 |Diplomat: A man who always remembers a http://nadav.harel.org.il |woman's birthday but never her age. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
