libvirt users - Dec 2014 - Two identical hosts, different capabilities and topologies

Hello,

I've two twin servers (Dell PowerEdge R815) dedicated to kvm+libvirt
and they have the same exact CPU (AMD Opteron(TM) Processor 6272) with
the same topology (2 sockets, 16 cores per socket, so a total of 32
CPUs seen by the kernel) but both virsh -r capabilities and virsh
nodeinfo say that the two machines are different - but they really are
not! - and this prevents live migration from one server to another
(but the other way round works). Attached you will find the output of
some programs, if you need more info just ask. They are both running
Debian Wheezy with latest backported kvm/libvirt (libvirt-daemon
1.2.9-6~bpo70+1). A curious fact is that kvm-host-01 detects the wrong
topology (1 socket, 32 cores per socket) but it displays more
capabilities, so migrating from kvm-host-02 -> kvm-host-01 works but
from 01 to 02 fails.

Any idea?

Thanks in advance