Re: Does KVM support the P.A. Semi PA6T cpu?

[Alexander Graf <agraf@suse.de>]

On 30.05.14 13:39, Christian Zigotzky wrote:
> On 30.05.2014 09:49, Alexander Graf wrote:
>>
>> On 30.05.14 01:50, Christian Zigotzky wrote:
>>> Hi Alex,
>>>
>>> I have traced a Mac OS X Tiger guest. I have started it in the 
>>> single user mode. Sometimes I get a shell. But the cpu load rise up 
>>> to 100% and I can't enter any commands.
>>>
>>> Screenshot: 
>>> http://forum.hyperion-entertainment.biz/download/file.php?id\x1205&mode=view
>>>
>>> Trace log: 
>>> http://forum.hyperion-entertainment.biz/download/file.php?id\x1204
>>>
>>> Could you look in the trace log, please? I can do more tests if you 
>>> like.
>>
>> $ echo 1 > /sys/kernel/debug/tracing/events/kvm/enabled
>> $ echo 1 > /sys/kernel/debug/tracing/events/kvm_pr/enabled
>> $ cat /sys/kernel/debug/tracing/trace_pipe > /dev/shm/trace &
>> $ start_mol -X
>> ...
>>
>> then check out /dev/shm/trace :).
>>
>>
>> Alex
>>
> Hi Alex,
>
> Thank you for your answer. Here are the traces:
>
> http://www.xenosoft.de/trace_mol_mac_os_x_tiger.txt.tar.gz
> http://www.xenosoft.de/trace_mol_mac_os_x_jaguar.txt.tar.gz

Looking at the Jaguar log, the guest seems to be stuck trying to map a page:

              mol-4087  [001] ....   252.368002: kvm_exit: 
exitÚTA_STORAGE | pc=0x900074c4 | msr=0x4000d030 | dar=0xa000a434 | 
srr1=0x100000000000d032 | last_inst=0x912b0
000

If you look at the trace, you will see that this PC with the exact same 
DAR happens over and over again - every time the guest thinks it's 
mapped the page.

I don't know why that's happening. Try to enable the debug prints (or 
convert them to trace points ;)) in the book3s_32 guest and book3s_64 
host emulation. Maybe that tells us something.


Alex