>> QEMU already emulates well other Linux-supported PPC32 hardware,
>> among them also other G4-based hardware (like PowerMac3,1/mac99).
>> [...] Furthermore, bug hunting of Linux software doesn't require QEMU
>> system emulation as QEMU user-mode emulation is to be preferred for this.

> Not regular software bugs yes, but Linux kernel bugs.

As said, that's what long-existing PowerMac3,1/mac99 emulation or other PPC32 system emulations are perfectly fine for.

> meanwhile several devs stood up for the Peg2
> so it is safe to stay for the time being.

Yes, Arnd Bergmann's summary for "powerpc/chrp (32-bit rs6000, pegasos2)" and others:

"a couple of users replied, but no architecture maintainer added any information, so I won't take any action."
https://www.lkml.org/lkml/2021/1/13/746