I have to go back to the libvirt code tomorrow. If I remember correctly it was 
using the physical_id info (which is also seen in /proc/cpuinfo) as the number 
of sockets. At least in the 14.04 version of libvirt. Might be something to 
explicitly check in newer versions. Since you already tested a recent kernel we 
can at least rule out that side. So it is very likely a change in libvirt.
Unfortunately I think it will not be as straight forward to try a newer libvirt 
as that likely has more dependencies. When I look into more details tomorrow, I 
try to build a 15.04 version of libvirt in a 15.04 build environment. The 
result should go only in a test environment as it will never get updated (just 
a cautious warning).

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https://bugs.launchpad.net/bugs/1446177

Title:
  Nodeinfo returns wrong NUMA topology / bad virtualization performance

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