Commit 19194169 authored by zhenwei pi's avatar zhenwei pi Committed by Greg Kroah-Hartman
Browse files

misc: pvpanic: add crash loaded event 



Some users prefer kdump tools to generate guest kernel dumpfile,
at the same time, need a out-of-band kernel panic event.

Currently if booting guest kernel with 'crash_kexec_post_notifiers',
QEMU will receive PVPANIC_PANICKED event and stop VM. If booting
guest kernel without 'crash_kexec_post_notifiers', guest will not
call notifier chain.

Add PVPANIC_CRASH_LOADED bit for pvpanic event, it means that guest
kernel actually hit a kernel panic, but the guest kernel wants to
handle by itself.

Signed-off-by: default avatarzhenwei pi <pizhenwei@bytedance.com>
Link: https://lore.kernel.org/r/20200102023513.318836-3-pizhenwei@bytedance.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e0b9a427

drivers/misc/pvpanic.c

+8 −1
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 


#include <linux/acpi.h>

#include <linux/kernel.h>

#include <linux/kexec.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_address.h>
@@ -33,7 +34,13 @@ static int 
pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,

		     void *unused)

{

	pvpanic_send_event(PVPANIC_PANICKED);

	unsigned int event = PVPANIC_PANICKED;



	if (kexec_crash_loaded())

		event = PVPANIC_CRASH_LOADED;



	pvpanic_send_event(event);



	return NOTIFY_DONE;

}

include/uapi/misc/pvpanic.h

+1 −0
Original line number Diff line number Diff line
@@ -4,5 +4,6 @@ 
#define __PVPANIC_H__



#define PVPANIC_PANICKED	(1 << 0)

#define PVPANIC_CRASH_LOADED	(1 << 1)



#endif /* __PVPANIC_H__ */