Commit 19194169 authored Jan 02, 2020 by zhenwei pi Committed by Greg Kroah-Hartman Jan 14, 2020

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: zhenwei pi <pizhenwei@bytedance.com>
Link: https://lore.kernel.org/r/20200102023513.318836-3-pizhenwei@bytedance.com


Signed-off-by: Greg 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__ */

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