Re: [Qemu-devel] [PATCH] exec: fix regression by making system-memory region UINT64_MAX size

[Paolo Bonzini]

Il 07/11/2013 22:51, Peter Maydell ha scritto:
>> > 1. Not all architectures have the behavior: "Address space that is not 
>> > RAM(and friends)
>> >     is for sure PCI". Only x86 behaves like this (I think).
> 
> More specifically, the x86 pc behaves like this. Other
> x86 based systems could in theory behave differently
> (not that we actually model any, I think).

After Marcel's patch, we have changed behavior for at least all boards
that pass get_system_memory() to pci_register_bus or pci_bus_new:

* mips/gt64xxx_pci.c

* pci-host/bonito.c

* pci-host/ppce500.c

* ppc/ppc4xx_pci.c

* sh4/sh_pci.c

These now will not go anymore through unassigned_mem_ops, which is a
behavioral change for MIPS boards (gt64xxx_pci and bonito) at least.

Furthermore, the default behavior of the memory API _is_ read
all-ones/ignore writes, so I'm not sure what's the benefit of adding a
separate region for master abort...

Paolo