On 10/11/2016 12:48, Marcelo Tosatti wrote: > Destination has to run the following logic: > > If (source has KVM_CAP_ADVANCE_CLOCK) > use KVM_GET_CLOCK value > Else > read pvclock from guest > > To support migration from older QEMU versions which do not have > KVM_CAP_ADVANCE_CLOCK (or new QEMU versions running on old > hosts without KVM_CAP_ADVANCE_CLOCK). > > I don't see any clean way to give that information, except changing > the migration format to pass "host: kvm_cap_advance_clock=true/false" > information. If you make it only affect new machine types, you could transmit a dummy clock value such as -1 if the source does not have KVM_CLOCK_TSC_STABLE. Paolo -- 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
