Re: [Qemu-devel] [6453] x86: Issue reset on triple faults (Jan Kiszka)

[Jan Kiszka <jan.kiszka@siemens.com>]

Kevin Wolf wrote:
> Jan Kiszka schrieb:
>> Kevin Wolf wrote:
>>> Anthony Liguori schrieb:
>>>> Revision: 6453
>>>>           http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6453
>>>> Author:   aliguori
>>>> Date:     2009-01-26 19:54:36 +0000 (Mon, 26 Jan 2009)
>>>>
>>>> Log Message:
>>>> -----------
>>>> x86: Issue reset on triple faults (Jan Kiszka)
>>>>
>>>> As discussed a few times on this list: A triple fault causes a system
>>>> reset on x86, and some guests make use of this (e.g. 386BSD). To keep
>>>> the chance of tracing unexpected resets, log them if CPU_LOG_RESET is
>>>> set.
>>>>
>>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>>> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
>>>>
>>>> Modified Paths:
>>>> --------------
>>>>     trunk/target-i386/op_helper.c
>>>>
>>>> Modified: trunk/target-i386/op_helper.c
>>>> ===================================================================
>>>> --- trunk/target-i386/op_helper.c	2009-01-26 19:54:31 UTC (rev 6452)
>>>> +++ trunk/target-i386/op_helper.c	2009-01-26 19:54:36 UTC (rev 6453)
>>>> @@ -1251,6 +1251,9 @@
>>>>      }
>>>>  }
>>>>  
>>>> +/* This should come from sysemu.h - if we could include it here... */
>>>> +void qemu_system_reset_request(void);
>>>> +
>>>>  /*
>>>>   * Check nested exceptions and change to double or triple fault if
>>>>   * needed. It should only be called, if this is not an interrupt.
>>>> @@ -1267,9 +1270,19 @@
>>>>      qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
>>>>                  env->old_exception, intno);
>>>>  
>>>> -    if (env->old_exception == EXCP08_DBLE)
>>>> -        cpu_abort(env, "triple fault");
>>>> +#if !defined(CONFIG_USER_ONLY)
>>>> +    if (env->old_exception == EXCP08_DBLE) {
>>>> +        if (env->hflags & HF_SVMI_MASK)
>>>> +            helper_vmexit(SVM_EXIT_SHUTDOWN, 0); /* does not return */
>>>>  
>>>> +        if (loglevel & CPU_LOG_RESET)
>>>> +            fprintf(logfile, "Triple fault\n");
>>> I think this one should use the new logging macros as well.
>> Or in other words:
>>
>> --------->
>>
>> Use new logging API.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>
>> diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c
>> index 8cf3bb2..edf569e 100644
>> --- a/target-i386/op_helper.c
>> +++ b/target-i386/op_helper.c
>> @@ -1275,7 +1275,7 @@ static int check_exception(int intno, int *error_code)
>>          if (env->hflags & HF_SVMI_MASK)
>>              helper_vmexit(SVM_EXIT_SHUTDOWN, 0); /* does not return */
>>  
>> -        if (loglevel & CPU_LOG_RESET)
>> +        if (qemu_loglevel_mask(CPU_LOG_RESET))
>>              fprintf(logfile, "Triple fault\n");
>>  
>>          qemu_system_reset_request();
> 
> Well, no. There's still a fprintf on logfile. ;-)
> 
> qemu_log_mask(CPU_LOG_RESET, "Triple fault\n") should do the right thing.
> 

Use new logging API.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c
index 8cf3bb2..9e73b1e 100644
--- a/target-i386/op_helper.c
+++ b/target-i386/op_helper.c
@@ -1275,8 +1275,7 @@ static int check_exception(int intno, int *error_code)
         if (env->hflags & HF_SVMI_MASK)
             helper_vmexit(SVM_EXIT_SHUTDOWN, 0); /* does not return */
 
-        if (loglevel & CPU_LOG_RESET)
-            fprintf(logfile, "Triple fault\n");
+        qemu_log_mask(CPU_LOG_RESET, "Triple fault\n");
 
         qemu_system_reset_request();
         return EXCP_HLT;