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For reasons that may be useful in future, CPU core objects, as used on the pseries machine type have their own nr-threads property, potentially allowing cores with different numbers of threads in the same system. If the user/management uses the values specified in query-hotpluggable-cpus as they're expected to do, this will never matter in pratice. But that's not actually enforced - it's possible to manually specify a core with a different number of threads from that in -smp. That will confuse the platform - most immediately, this can be used to create a CPU thread with index above max_cpus which leads to an assertion failure in spapr_cpu_core_realize(). For now, enforce that all cores must have the same, standard, number of threads. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Bharata B Rao <bharata@linux.vnet.ibm.com>