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Re: [Qemu-devel] [6453] x86: Issue reset on triple faults (Jan Kiszka)
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [6453] x86: Issue reset on triple faults (Jan Kiszka) |
Date: |
Tue, 27 Jan 2009 11:24:31 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
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 <address@hidden>
>> Signed-off-by: Anthony Liguori <address@hidden>
>>
>> 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 <address@hidden>
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();