Brandon Bergren 6957645145 [PowerPC64] Fix xive order calculation in qemu TCG
When emulating a single thread system for testing reasons, mp_maxid can
be 0. This trips up our math for calculating the order.

Account for this to fix xive attachment when emulating a single-thread
core on qemu powernv (a configuration that doesn't exist in the real world.)

Sponsored by:	Tag1 Consulting, Inc.
2020-09-08 23:48:49 +00:00
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