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

From: Benjamin Herrenschmidt
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 01/10] ppc: Fix rfi/rfid/hrfi/... emulation
Date: Mon, 20 Jun 2016 19:32:16 +1000

On Mon, 2016-06-20 at 18:02 +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2016-06-20 at 17:08 +1000, Benjamin Herrenschmidt wrote:
> >  
> > That fixed, it dies elsewhere in something related to page faults,
> > still digging.
> >  
> Next problem: Darwin kernel assumes DSISR is 0 on a 0x380 exception !
> qemu was leaving it to whatever value it had before. Kaboom.
> Now it crashes a bit further :-)

Right so it tries to load a MacRISC2 PE because we don't really emulate
a MacRISC4 with U3 etc... and that isn't going to do it any good,

I'm not *actually* sure where MacOS gets itself into a spin, it seems
to be poking at something at 0xf280_0000 which is somewhat odd as this
would be the IO space and we have nothing there afaik, but I am not
enough of a MacOS expert to figure out quite how to track down which
kext it gets into etc...

In any case, the machine we give it is definitely nowhere near a real
G5 and that might be the main reason. More work needed.

I'll still cleanup & submit my current crop of fixes in case somebody
wants to have a look.


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