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...
Rich.
--
Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
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