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Subject[RFC] arch generic way to trigger unknown NMIs
Hi,

I was trying to put some automation test scripts together and was looking
for an arch neutral way to generate an unknown NMI. I know some arches
do not support NMI. Any way I wanted to add the code to the lkdtm module,
so I could more easily generate unknown NMIs without hacking up the code.

For x86, I have been using:


diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index ef34de7..c685242 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -43,6 +43,7 @@
#include <linux/slab.h>
#include <scsi/scsi_cmnd.h>
#include <linux/debugfs.h>
+#include <asm/apic.h>

#ifdef CONFIG_IDE
#include <linux/ide.h>
@@ -78,6 +79,7 @@ enum ctype {
SOFTLOCKUP,
HARDLOCKUP,
HUNG_TASK,
+ NMI,
};

static char* cp_name[] = {
@@ -105,6 +107,7 @@ static char* cp_type[] = {
"SOFTLOCKUP",
"HARDLOCKUP",
"HUNG_TASK",
+ "NMI",
};

static struct jprobe lkdtm;
@@ -340,6 +343,9 @@ static void lkdtm_do_action(enum ctype which)
set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
break;
+ case NMI:
+ apic->send_IPI_allbutself(NMI_VECTOR);
+ break;
case NONE:
default:
break;
Anyone have any thoughts? Maybe there is an easier way?

Thanks,
Don


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