This large patch series makes a serious overhaul of the MMU implementation for target-ppc. Previously all the quite dissimilar PowerPC MMU variants attempted to use a more-or-less common code path, with dependencies on env->mmu_model scattered throughout. The resulting confused code was not worth the handful of saved lines.
This series starts the transition to a new model, where the different MMU types are represented by appropriate QOM methods on the CPU object. For now, only the main translation path - previously cpu_ppc_handle_mmu_fault() is made such a method, but more could be added in future. For now, 32-bit and 64-bit hash page table based MMUs (the "classic" PPC MMUs) are given their own handle_mmu_fault functions - the remaining MMU types retain the old code for now, I'm hoping those more familiar with them will perform a similar conversion in future though. There's plenty more cleanup that could be done. As well as the obvious work to convert other MMU types, there's room for improvement in: handling of SDR1 and other SPRs, handling of segment registers, switching MMU code to user PowerPCCPU instead of CPUPPCState, remove the duplicate mmu_model in PowerpCCPUClass and CPUPPCState, removing remaining uses of mmu_model. But if I tackled all those now, I might never get this series ready. Please apply.
