spapr: don't advertise radix GTSE if max-compat-cpu < power9
On a POWER9 host, if a guest runs in pre POWER9 compat mode, it necessarily uses the hash MMU mode. In this case, we shouldn't advertise radix GTSE in the ibm,arch-vec-5-platform-support DT property as the current code does. The first reason is that it doesn't make sense, and the second one is that causes the CAS-negotiated options subsection to be migrated. This breaks backward migration to QEMU 2.7 and older versions on POWER8 hosts: qemu-system-ppc64: error while loading state for instance 0x0 of device 'spapr' qemu-system-ppc64: load of migration failed: No such file or directory This patch hence initialize CPUs a bit earlier so that we can check the requested compat mode, and don't set OV5_MMU_RADIX_GTSE for power8 and older. Signed-off-by: NGreg Kurz <groug@kaod.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> (cherry picked from commit 0550b120) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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