qemu/softmmu/runstate-action.c
Alejandro Jimenez c753e8e725 vl: Add option to avoid stopping VM upon guest panic
The current default action of pausing a guest after a panic event
is received leaves the responsibility to resume guest execution to the
management layer. The reasons for this behavior are discussed here:
https://lore.kernel.org/qemu-devel/52148F88.5000509@redhat.com/

However, in instances like the case of older guests (Linux and
Windows) using a pvpanic device but missing support for the
PVPANIC_CRASHLOADED event, and Windows guests using the hv-crash
enlightenment, it is desirable to allow the guests to continue
running after sending a PVPANIC_PANICKED event. This allows such
guests to proceed to capture a crash dump and automatically reboot
without intervention of a management layer.

Add an option to avoid stopping a VM after a panic event is received,
by passing:

-action panic=none

in the command line arguments, or during runtime by using an upcoming
QMP command.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Message-Id: <1607705564-26264-3-git-send-email-alejandro.j.jimenez@oracle.com>
[Do not fix panic action in the variable, instead modify -no-shutdown. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15 12:51:58 -05:00

47 lines
1.2 KiB
C

/*
* Copyright (c) 2020 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "sysemu/runstate-action.h"
#include "sysemu/watchdog.h"
#include "qemu/config-file.h"
#include "qapi/error.h"
#include "qemu/option_int.h"
RebootAction reboot_action = REBOOT_ACTION_NONE;
ShutdownAction shutdown_action = SHUTDOWN_ACTION_POWEROFF;
PanicAction panic_action = PANIC_ACTION_POWEROFF;
/*
* Receives actions to be applied for specific guest events
* and sets the internal state as requested.
*/
void qmp_set_action(bool has_reboot, RebootAction reboot,
bool has_shutdown, ShutdownAction shutdown,
bool has_panic, PanicAction panic,
bool has_watchdog, WatchdogAction watchdog,
Error **errp)
{
if (has_reboot) {
reboot_action = reboot;
}
if (has_panic) {
panic_action = panic;
}
if (has_watchdog) {
qmp_watchdog_set_action(watchdog, errp);
}
/* Process shutdown last, in case the panic action needs to be altered */
if (has_shutdown) {
shutdown_action = shutdown;
}
}