On 20 January 2012 12:06, Paolo Bonzini <pbonz...@redhat.com> wrote: > This lets the user specify the desired semantics. By default, the RTC > will follow adjustments from the host's NTP client, and will remain in > sync when the virtual machine is stopped. The previous behavior, which > provides determinism with both icount and qtest, remains available with > "-rtc clock=vm". > > pl031 supports migration, so we need to convert the time > base from rtc_clock to vm_clock and back for backwards compatibility.
If it would be cleaner I'm entirely happy for us to do a version bump and break binary compatibility. (We bump the version on the CPUState pretty regularly anyhow; save/load for ARM devices currently is mostly for the benefit of snapshot save/restore rather than between-qemu-versions migration.) -- PMM
