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softmmu/runstate: add a way to detect force shutdowns

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This can be useful for devices that might take too long to shut down
gracefully, but may have a way to shutdown quickly otherwise if needed
or explicitly requested by a force shutdown.

For now we only consider SIGTERM or the QMP quit() command a force
shutdown, since those bypass the guest entirely and are equivalent to
pulling the power plug.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Message-Id: <20250609212547.2859224-2-d-tatianin@yandex-team.ru>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Daniil Tatianin 2025-06-10 00:25:45 +03:00 • committed by Michael S. Tsirkin
parent 9f749129e2
commit 260f826cf8
2 changed files with 11 additions and 0 deletions
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1
include/system/runstate.h
View file

@ -107,6 +107,7 @@ void qemu_system_vmstop_request(RunState reason);
void qemu_system_vmstop_request_prepare(void);
bool qemu_vmstop_requested(RunState *r);
ShutdownCause qemu_shutdown_requested_get(void);
bool qemu_force_shutdown_requested(void);
ShutdownCause qemu_reset_requested_get(void);
void qemu_system_killed(int signal, pid_t pid);
void qemu_system_reset(ShutdownCause reason);

10
system/runstate.c
View file

@ -437,6 +437,7 @@ static ShutdownCause reset_requested;
static ShutdownCause shutdown_requested;
static int shutdown_exit_code = EXIT_SUCCESS;
static int shutdown_signal;
static bool force_shutdown;
static pid_t shutdown_pid;
static int powerdown_requested;
static int debug_requested;
@ -457,6 +458,11 @@ ShutdownCause qemu_shutdown_requested_get(void)
return shutdown_requested;
}
bool qemu_force_shutdown_requested(void)
{
return force_shutdown;
}
ShutdownCause qemu_reset_requested_get(void)
{
return reset_requested;
@ -805,6 +811,7 @@ void qemu_system_killed(int signal, pid_t pid)
* we are in a signal handler.
*/
shutdown_requested = SHUTDOWN_CAUSE_HOST_SIGNAL;
force_shutdown = true;
qemu_notify_event();
}
@ -820,6 +827,9 @@ void qemu_system_shutdown_request(ShutdownCause reason)
trace_qemu_system_shutdown_request(reason);
replay_shutdown_request(reason);
shutdown_requested = reason;
if (reason == SHUTDOWN_CAUSE_HOST_QMP_QUIT) {
force_shutdown = true;
}
qemu_notify_event();
}