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

[Alexander Graf <agraf@suse.de>]

On 06/20/2016 11:32 AM, Benjamin Herrenschmidt wrote:
> 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,
> really..
>
> 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.

Since the patches do get you further along and get us closer to an 
actual 970, I guess it's a good idea to actually push them into the tree.

Alex