Assertion triggers with power8e_v2.1-powernv-cpu-core

[Thomas Huth]

FYI, scripts/device-crash-test reported an assertion, triggerable like this:

$ qemu-system-ppc64 -machine ppce500 -device power8e_v2.1-powernv-cpu-core
qemu-system-ppc64: hw/ppc/pnv_core.c:221: pnv_core_realize: Assertion
`pc->chip' failed.
Aborted (core dumped)

Of course using that CPU is not possible on ppce500, but there should be
a proper error message instead of that assertion.

Does anybody have an idea what's the best place to fix this issue?

 Thomas