diff options
| author | zhenwei pi <pizhenwei@bytedance.com> | 2020-01-02 10:35:13 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-14 15:07:37 +0100 |
| commit | 191941692a3d1b6a9614502b279be062926b70f5 (patch) | |
| tree | 50484f123e581ad809184a2338aef9a297d18196 | |
| parent | e0b9a42735f2672ca2764cfbea6e55a81098d5ba (diff) | |
| download | lwn-191941692a3d1b6a9614502b279be062926b70f5.tar.gz lwn-191941692a3d1b6a9614502b279be062926b70f5.zip | |
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>
| -rw-r--r-- | drivers/misc/pvpanic.c | 9 | ||||
| -rw-r--r-- | include/uapi/misc/pvpanic.h | 1 |
2 files changed, 9 insertions, 1 deletions
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__ */ |