Messages in this thread Patch in this message | | | From | zhenwei pi <> | Subject | [PATCH v2 2/2] misc: pvpanic: add crash loaded event | Date | Wed, 25 Dec 2019 14:26:22 +0800 |
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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> --- drivers/misc/pvpanic.c | 9 ++++++++- include/uapi/misc/pvpanic.h | 1 + 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c index 3f0de3be0a19..a6e1a8983e1f 100644 --- a/drivers/misc/pvpanic.c +++ b/drivers/misc/pvpanic.c @@ -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; } diff --git a/include/uapi/misc/pvpanic.h b/include/uapi/misc/pvpanic.h index cae69a822b25..54b7485390d3 100644 --- a/include/uapi/misc/pvpanic.h +++ b/include/uapi/misc/pvpanic.h @@ -4,5 +4,6 @@ #define __PVPANIC_H__ #define PVPANIC_PANICKED (1 << 0) +#define PVPANIC_CRASH_LOADED (1 << 1) #endif /* __PVPANIC_H__ */ -- 2.11.0
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