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H A Dspapr.ccba0e779 Tue Feb 23 10:47:59 CST 2016 Greg Kurz <gkurz@linux.vnet.ibm.com> spapr: disable vmdesc submission for old machines

Since QEMU 2.3, we have a vmdesc section in the migration stream.
This section is not mandatory but when migrating a pseries-2.2
machine from QEMU 2.2, you get a warning at the destination:

qemu-system-ppc64: Expected vmdescription section, but got 0

The warning goes away if we decide to skip vmdesc as well for
older pseries, like it is already done for pc's.

This can only be observed with -cpu POWER7 because POWER8
cannot migrate from QEMU 2.2 to 2.3 (insns_flags2 mismatch).

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>