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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: Sun, 19 Jun 2016 19:23:33 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0

On 06/19/2016 04:08 PM, Benjamin Herrenschmidt wrote:
> On Sun, 2016-06-19 at 14:49 +0200, Cédric Le Goater wrote:
>>> So my test is correct in the context of what we emulate today.
>> OK. so this is an openbios issue when run under a ppc64. shouldn't we 
>> be using an openbios-ppc64 in that case ?  
>> We could be more strict with the rfi instruction. 
> Well, ppc64 isn't backward compatible with ppc32 at the supervisor
> level, at least not on server chips (it is on bookE chips). So yes it's
> an OpenBIOS problem but that doesn't mean we have to use openbios-ppc64 
> :-) 
> 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 ? 


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