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

From: Cédric Le Goater
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 01/10] ppc: Fix rfi/rfid/hrfi/... emulation
Date: Mon, 20 Jun 2016 08:10:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0

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 ? 



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