Wrong number of CPUs in /proc/cpuinfo when using Virtual Processor in PowerPC

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Issue

When reserving 4 cores with HMC (Hardware Management Console) in a LPAR, the Operating System shows 16 cores.
Reserved 4 cores not 4 physical processors, HMC shows the correct value (4) that diverges from Operating System.

Environment

Red Hat Enterprise Linux 6.x
IBM Power 770
PowerPC (ppc) architecture

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