Re: [Qemu-devel] [Qemu-ppc] [PATCH 01/10] ppc: Fix rfi/rfid/hrfi/... emulation

[Cédric Le Goater]

On 06/19/2016 11:12 PM, Benjamin Herrenschmidt wrote:
> On Sun, 2016-06-19 at 19:23 +0200, Cédric Le Goater wrote:
>>> You can run a 32-bit OS or firmware on ppc64, but it needs to know that
>>> it's running on a 64-bit chip and do a few things differently.
>>
>> yes sure but qemu would still allow rfi under 64bit CPUs, that is what 
>> I was concerned about. Is that ok ? 
> 
> Why ? A real CPU won't allow it, why should we ?

That is how I feel also. So, why don't we just remove the op code in the 
instruction sets from the 32bit CPUs instead of leaving it and testing 
for PPC_SEGMENT_64B ? or is there some reasons we want to keep it around ? 

Cheers,

C.