Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/3] ppc: complete the new HV mode

[Mark Cave-Ayland]

On 03/06/16 15:06, Cedric Le Goater wrote:

> On 06/03/2016 04:00 PM, Cédric Le Goater wrote:
>> Hello Mark,
>>
>> On 06/03/2016 03:52 PM, Mark Cave-Ayland wrote:
>>> On 03/06/16 13:11, Cédric Le Goater wrote:
>>>
>>>> This is follow up to complete the serie "ppc: preparing pnv landing
>>>> (round 2)" plus a little fix on instruction privileges.
>>>>
>>>> Tested on a POWER8 pserie guest and on mac99.
>>>>
>>>> Benjamin Herrenschmidt (2):
>>>>   ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV
>>>>   ppc: Better figure out if processor has HV mode
>>>>
>>>> Cédric Le Goater (1):
>>>>   ppc: fix hrfid, tlbia and slbia privilege
>>>>
>>>>  target-ppc/cpu.h            |  4 ++++
>>>>  target-ppc/excp_helper.c    |  8 ++++++--
>>>>  target-ppc/helper_regs.h    |  4 ++--
>>>>  target-ppc/translate.c      | 10 ++++++----
>>>>  target-ppc/translate_init.c | 19 +++++++++++++++----
>>>>  5 files changed, 33 insertions(+), 12 deletions(-)
>>>
>>> Hi Cédric,
>>>
>>> I can confirm that this patchset fixes starting up OpenBIOS for both
>>> g3beige/mac99 in my tests here. With the escc fix also applied, the only
>>> outstanding issue is the removal of the tlb_flush() statements which
>>> causes Darwin, MacOS X and HelenOS 0.60 to panic on boot
>>
>> Is that just booting the CDROM or the complete OS ? because I tried that a 
>> couple of time with ppc-for-2.7-20160531 + the three patches above and 
>> did not see the issue again. I reached the device selection prompt. 
>>
>> I must be doing something wrong. 
> 
> I was using '-cpu 750' for some reason and this is why it succeeded. It fails
> without. We are getting close. 

Hmmm that works for -M g3beige Darwin, but not HelenOS here. Although
interestingly -M g3beige -m 256 seems to "fix" Darwin here too
(presumably because the memory allocation routines can just allocate new
RAM rather than reusing existing RAM which may be cached in the TLB).

What a strange coincidence that I've just posted a patch that fixes up
the debugging in target-ppc/mmu_helper.c ;)


ATB,

Mark.