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From: Thomas Huth <thuth@redhat.com>
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Date: Tue, 28 Jun 2016 09:29:33 +0200
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Subject: [Qemu-devel] pseries machine does not like older CPUs anymore
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To: Bharata B Rao <bharata@linux.vnet.ibm.com>, qemu-ppc@nongnu.org
Cc: David Gibson <david@gibson.dropbear.id.au>, QEMU Developers <qemu-devel@nongnu.org>


 Hi Bharata,

there seems to be a regression with current QEMU master: The pseries
machine does not work with older 64-bit ppc CPUs anymore. With QEMU
2.6.0, it is possible to run:

 qemu-system-ppc64 -nographic -M pseries -cpu 970

or

 qemu-system-ppc64 -nographic -M pseries -cpu POWER5+

but with QEMU master, I now only get a "Unable to find sPAPR CPU Core
definition" error message and then QEMU quits.

At a quick glance, this seems to be related to the new CPU hotplug
code... so could you maybe have a look?

 Thanks,
  Thomas