Re: [PATCH] Check CPL for break 0x80001 case. Re: [Xen-ia64-devel] [Q]ltrace and do_ssc

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

Hi, Isaku

Thank you for your comments.
I am just caring ltrace problem.
I just check dom0 boot and ltrace command.
If any suggestions, please fix it.
(Since I have no idea on this.)

Thanks
Atsushi SAKAI



>This patch is incomplete.
>If the guest kernel issues break 0x80001 or 0x80002 with
>an unknown SSC command, xen shouldn't fall in infinit loop.
>It should panic domain (not xen) or return error.
>
>On Wed, Nov 29, 2006 at 08:07:36PM +0900, Atsushi SAKAI wrote:
>> Hi, All
>> 
>>  This is a patch which intends for fixing ltrace problem.
>> When I execute a command "ltrace ps" on dom0, it makes dom0 hung.
>> It comes from "break 0x80001" is shared by ltrace(CPL=3) and hpsim(CPL=2).
>> To avoid this problem, I just add check CPL in ia64_break_fault code.
>> 
>> References
>> Yamahata mail
>> http://lists.xensource.com/archives/html/xen-ia64-devel/2006-11/msg00319.html
>> Alex mail
>> http://lists.xensource.com/archives/html/xen-ia64-devel/2006-11/msg00318.html
>> 
>> Signed-off-by: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>
>> 
>> 
>> Thanks
>> Atsushi SAKAI
>> 
>> 
>> 
>> 
>> >Hi, Alex
>> >
>> >Thank you for your comments
>> >With this following fixes it seems running.
>> >
>> >
>> >Thanks
>> >Atsushi SAKAI
>> >
>> >>On Wed, 2006-11-29 at 11:27 +0900, Atsushi SAKAI wrote:
>> >>> Hi, Alex
>> >>>
>> >>>   I am trying "ltrace ps" on IA64.
>> >>> It makes dom0 hung.
>> >>>
>> >>> >From the serial console messages,
>> >>> (XEN) ia64_handle_break: bad ssc code 400000000001c480, 
>> >>> iip=0x4000000000002140,
>> >>> b0=0x4000000000002380... spinning
>> >>>
>> >>> It seems come from following system call.
>> >>>
>> >>> ia64_ssc@xxxxxxxxxxxxxxxxxxx/arch/ia64/hp/sim/hpsim.S
>> >>>
>> >>>
>> >>> Do you have any idea to solve this problem?
>> >>
>> >>   I'd guess you happened to hit a break value that overlaps with the
>> >>ones chosen for trapping into ski.  You might try getting rid of the
>> >>first test in handle_break() that calls do_ssc().
>> >>
>> >>   Alex
>> >>
>> >>--
>> >>Alex Williamson                             HP Open Source & Linux Org.
>> >>
>> >>
>> >
>> >
>> >
>> >
>> >
>> 
>> >_______________________________________________
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>> >Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> >http://lists.xensource.com/xen-ia64-devel
>> 
>> 
>> 
>> 
>> 
>> 
>
>
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>
>-- 
>yamahata
>







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