CPU suspend is not implemented for sparc guests.
Unlike most other targets, suspending the CPU is controlled by the system
chipset, not by an instruction on the CPU. See slavio_misc.c
Suspending is disabled, because it crashes qemu. It can be tested by
tweaking slavio_misc.c and renaming the device in OpenBIOS from
xxxpower-management to power-management. I can't see why it should crash,
the implementation is very straightforward. Or maybe halting the CPU should
be delayed until the TB is finished executing and halt only from main loop?
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