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[Qemu-devel] Re: [PATCH] Reboot CPU on triple fault
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: [PATCH] Reboot CPU on triple fault |
Date: |
Tue, 15 Apr 2008 18:05:40 +0200 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20080226) |
Kevin Wolf wrote:
> Alexander Graf schrieb:
>> On Mar 29, 2008, at 7:13 PM, Hervé Poussineau wrote:
>>
>>> Hi,
>>>
>>> On i386/x86-64, CPU must reboot when a triple fault is detected.
>>> Attached patch implements this behaviour.
>> So what exactly does check_exception() in target-i386/helper.c do then?
>> Should the cpu_reset call go in there?
>
> It definitely should. Besides, I'd really like to have the CPU dump on
> triple faults retained. In most cases, this will be a lot more useful
> than a silent reboot.
As the same requirement came up here, I worked out the following patch.
I feel a bit uneasy about it because
o I'm unsure if breaking out of the exception loop is OK this way.
o including necessary headers fails, mostly due to stdio redefinitions
in dyngen-exec.h.
This patch behaves as it should, but only in one specific test case.
Feedback is welcome.
(BTW, the original patch didn't work at all.)
Signed-off-by: Jan Kiszka <address@hidden>
---
dyngen-exec.h | 1 +
target-i386/helper.c | 19 +++++++++++++++++--
2 files changed, 18 insertions(+), 2 deletions(-)
Index: b/dyngen-exec.h
===================================================================
--- a/dyngen-exec.h
+++ b/dyngen-exec.h
@@ -86,6 +86,7 @@ typedef struct FILE FILE;
extern int fprintf(FILE *, const char *, ...);
extern int fputs(const char *, FILE *);
extern int printf(const char *, ...);
+extern FILE *stderr;
#undef NULL
#define NULL 0
Index: b/target-i386/helper.c
===================================================================
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1231,6 +1231,8 @@ void do_interrupt(int intno, int is_int,
}
}
+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.
@@ -1248,8 +1250,21 @@ static int check_exception(int intno, in
fprintf(logfile, "check_exception old: %x new %x\n",
env->old_exception, intno);
- if (env->old_exception == EXCP08_DBLE)
- cpu_abort(env, "triple fault");
+ if (env->old_exception == EXCP08_DBLE) {
+ fprintf(stderr, "qemu: warning: triple fault\n");
+ if(env->intercept & INTERCEPT_SVM_MASK) {
+ /* most probably the virtual machine should not
+ be shut down but rather caught by the VMM */
+ vmexit(SVM_EXIT_SHUTDOWN, 0);
+ }
+ cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU | X86_DUMP_CCOP);
+ if (logfile) {
+ fprintf(logfile, "qemu: warning: triple fault\n");
+ cpu_dump_state(env, logfile, fprintf, X86_DUMP_FPU |
X86_DUMP_CCOP);
+ }
+ qemu_system_reset_request();
+ return 0;
+ }
if ((first_contributory && second_contributory)
|| (env->old_exception == EXCP0E_PAGE &&
- [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault,
Jan Kiszka <=
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Paul Brook, 2008/04/15
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Kevin Wolf, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Jamie Lokier, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Antoine Kaufmann, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Kevin Wolf, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Michal Schulz, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Michal Schulz, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Kevin Wolf, 2008/04/16
- [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Jan Kiszka, 2008/04/16
- Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault, Jamie Lokier, 2008/04/16