This thread may be of interest: http://lists.gnu.org/archive/html/qemu-devel/2011-05/threads.html#02162 Currently, qemu silently clips any JSON integer in the range 0x8000_0000_0000_0000 - 0xffff_ffff_ffff_ffff (all numbers in this range will be clipped to 0x7fff_ffff_ffff_ffff == LLONG_MAX). This basically could affect any libvirt code in this file which uses the "U:..." prefix as far as I can tell: http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/qemu/qemu_monitor_json.c;hb=HEAD Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list