Windows Guest ignores CPU topology settings on Ubuntu Lucid host

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I try to assign 8 host cores to Windows 2003 Server Standard guest. Because this OS version has a limit of 4 sockets, I have to change the CPU topology. My guest definition:

  <vcpu>8</vcpu>
  <cpu match='minimum'>
    <model>core2duo</model>
    <topology sockets='4' cores='1' threads='2'/>
  </cpu>

doesn't work as expected. I should have 4 CPUs in the Device Manager and 8 CPU charts in Task Manager, but I have the opposite. And no matter what numbers I set in the topology, the guest always detects 8 sockets. What am I doing wrong?

libvirt 0.7.5
qemu-kvm 0.12.3
--
Karol Jędrzejczyk

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