Unrelated to KVM: Do you happen to know whether there are any problems when running 32-bit guests with TCG with the mac99 or g3beige machine while using qemu-system-ppc64 ?
We removed rfi support for 64bit machine in QEMU 2.7. Commit a2e71b28e8 ("ppc: Fix rfi/rfid/hrfi/... emulation"). So a mac99 machine using a 970 CPU needs a 64 bit kernel. The rfi insn was deleted from the ISA ... C.