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qemu/system/runstate.c
Juraj Marcin 1b063fe2df reset: Use ResetType for qemu_devices_reset() and MachineClass::reset() 
Currently, both qemu_devices_reset() and MachineClass::reset() use
ShutdownCause for the reason of the reset. However, the Resettable
interface uses ResetState, so ShutdownCause needs to be translated to
ResetType somewhere. Translating it qemu_devices_reset() makes adding
new reset types harder, as they cannot always be matched to a single
ShutdownCause here, and devices may need to check the ResetType to
determine what to reset and if to reset at all.

This patch moves this translation up in the call stack to
qemu_system_reset() and updates all MachineClass children to use the
ResetType instead.

Message-ID: <20240904103722.946194-2-jmarcin@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Juraj Marcin <jmarcin@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
2024-09-24 11:33:34 +02:00

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/*
* QEMU main system emulation loop
*
* Copyright (c) 2003-2020 QEMU contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "audio/audio.h"
#include "block/block.h"
#include "block/export.h"
#include "chardev/char.h"
#include "crypto/cipher.h"
#include "crypto/init.h"
#include "exec/cpu-common.h"
#include "gdbstub/syscalls.h"
#include "hw/boards.h"
#include "hw/resettable.h"
#include "migration/misc.h"
#include "migration/postcopy-ram.h"
#include "monitor/monitor.h"
#include "net/net.h"
#include "net/vhost_net.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-run-state.h"
#include "qapi/qapi-events-run-state.h"
#include "qemu/accel.h"
#include "qemu/error-report.h"
#include "qemu/job.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "qemu/timer.h"
#include "qemu/thread.h"
#include "qom/object.h"
#include "qom/object_interfaces.h"
#include "sysemu/cpus.h"
#include "sysemu/qtest.h"
#include "sysemu/replay.h"
#include "sysemu/reset.h"
#include "sysemu/runstate.h"
#include "sysemu/runstate-action.h"
#include "sysemu/sysemu.h"
#include "sysemu/tpm.h"
#include "trace.h"
static NotifierList exit_notifiers =
NOTIFIER_LIST_INITIALIZER(exit_notifiers);
static RunState current_run_state = RUN_STATE_PRELAUNCH;
/* We use RUN_STATE__MAX but any invalid value will do */
static RunState vmstop_requested = RUN_STATE__MAX;
static QemuMutex vmstop_lock;
typedef struct {
RunState from;
RunState to;
} RunStateTransition;
static const RunStateTransition runstate_transitions_def[] = {
{ RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE },
{ RUN_STATE_PRELAUNCH, RUN_STATE_SUSPENDED },
{ RUN_STATE_DEBUG, RUN_STATE_RUNNING },
{ RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_DEBUG, RUN_STATE_PRELAUNCH },
{ RUN_STATE_INMIGRATE, RUN_STATE_INTERNAL_ERROR },
{ RUN_STATE_INMIGRATE, RUN_STATE_IO_ERROR },
{ RUN_STATE_INMIGRATE, RUN_STATE_PAUSED },
{ RUN_STATE_INMIGRATE, RUN_STATE_RUNNING },
{ RUN_STATE_INMIGRATE, RUN_STATE_SHUTDOWN },
{ RUN_STATE_INMIGRATE, RUN_STATE_SUSPENDED },
{ RUN_STATE_INMIGRATE, RUN_STATE_WATCHDOG },
{ RUN_STATE_INMIGRATE, RUN_STATE_GUEST_PANICKED },
{ RUN_STATE_INMIGRATE, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_INMIGRATE, RUN_STATE_PRELAUNCH },
{ RUN_STATE_INMIGRATE, RUN_STATE_POSTMIGRATE },
{ RUN_STATE_INMIGRATE, RUN_STATE_COLO },
{ RUN_STATE_INTERNAL_ERROR, RUN_STATE_PAUSED },
{ RUN_STATE_INTERNAL_ERROR, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_INTERNAL_ERROR, RUN_STATE_PRELAUNCH },
{ RUN_STATE_IO_ERROR, RUN_STATE_RUNNING },
{ RUN_STATE_IO_ERROR, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_IO_ERROR, RUN_STATE_PRELAUNCH },
{ RUN_STATE_PAUSED, RUN_STATE_RUNNING },
{ RUN_STATE_PAUSED, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_PAUSED, RUN_STATE_POSTMIGRATE },
{ RUN_STATE_PAUSED, RUN_STATE_PRELAUNCH },
{ RUN_STATE_PAUSED, RUN_STATE_COLO},
{ RUN_STATE_PAUSED, RUN_STATE_SUSPENDED},
{ RUN_STATE_POSTMIGRATE, RUN_STATE_RUNNING },
{ RUN_STATE_POSTMIGRATE, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_POSTMIGRATE, RUN_STATE_PRELAUNCH },
{ RUN_STATE_PRELAUNCH, RUN_STATE_RUNNING },
{ RUN_STATE_PRELAUNCH, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_RUNNING },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_PAUSED },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_POSTMIGRATE },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_PRELAUNCH },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_COLO },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_INTERNAL_ERROR },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_IO_ERROR },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_SHUTDOWN },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_SUSPENDED },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_WATCHDOG },
{ RUN_STATE_FINISH_MIGRATE, RUN_STATE_GUEST_PANICKED },
{ RUN_STATE_RESTORE_VM, RUN_STATE_RUNNING },
{ RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH },
{ RUN_STATE_RESTORE_VM, RUN_STATE_SUSPENDED },
{ RUN_STATE_COLO, RUN_STATE_RUNNING },
{ RUN_STATE_COLO, RUN_STATE_PRELAUNCH },
{ RUN_STATE_COLO, RUN_STATE_SHUTDOWN},
{ RUN_STATE_RUNNING, RUN_STATE_DEBUG },
{ RUN_STATE_RUNNING, RUN_STATE_INTERNAL_ERROR },
{ RUN_STATE_RUNNING, RUN_STATE_IO_ERROR },
{ RUN_STATE_RUNNING, RUN_STATE_PAUSED },
{ RUN_STATE_RUNNING, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_RUNNING, RUN_STATE_RESTORE_VM },
{ RUN_STATE_RUNNING, RUN_STATE_SAVE_VM },
{ RUN_STATE_RUNNING, RUN_STATE_SHUTDOWN },
{ RUN_STATE_RUNNING, RUN_STATE_WATCHDOG },
{ RUN_STATE_RUNNING, RUN_STATE_GUEST_PANICKED },
{ RUN_STATE_RUNNING, RUN_STATE_COLO},
{ RUN_STATE_SAVE_VM, RUN_STATE_RUNNING },
{ RUN_STATE_SAVE_VM, RUN_STATE_SUSPENDED },
{ RUN_STATE_SHUTDOWN, RUN_STATE_PAUSED },
{ RUN_STATE_SHUTDOWN, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_SHUTDOWN, RUN_STATE_PRELAUNCH },
{ RUN_STATE_SHUTDOWN, RUN_STATE_COLO },
{ RUN_STATE_DEBUG, RUN_STATE_SUSPENDED },
{ RUN_STATE_RUNNING, RUN_STATE_SUSPENDED },
{ RUN_STATE_SUSPENDED, RUN_STATE_RUNNING },
{ RUN_STATE_SUSPENDED, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_SUSPENDED, RUN_STATE_PRELAUNCH },
{ RUN_STATE_SUSPENDED, RUN_STATE_COLO},
{ RUN_STATE_SUSPENDED, RUN_STATE_PAUSED},
{ RUN_STATE_SUSPENDED, RUN_STATE_SAVE_VM },
{ RUN_STATE_SUSPENDED, RUN_STATE_RESTORE_VM },
{ RUN_STATE_SUSPENDED, RUN_STATE_SHUTDOWN },
{ RUN_STATE_WATCHDOG, RUN_STATE_RUNNING },
{ RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_WATCHDOG, RUN_STATE_PRELAUNCH },
{ RUN_STATE_WATCHDOG, RUN_STATE_COLO},
{ RUN_STATE_GUEST_PANICKED, RUN_STATE_RUNNING },
{ RUN_STATE_GUEST_PANICKED, RUN_STATE_FINISH_MIGRATE },
{ RUN_STATE_GUEST_PANICKED, RUN_STATE_PRELAUNCH },
{ RUN_STATE__MAX, RUN_STATE__MAX },
};
static const RunStateTransition replay_play_runstate_transitions_def[] = {
{ RUN_STATE_SHUTDOWN, RUN_STATE_RUNNING},
{ RUN_STATE__MAX, RUN_STATE__MAX },
};
static bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX];
bool runstate_check(RunState state)
{
return current_run_state == state;
}
static void transitions_set_valid(const RunStateTransition *rst)
{
const RunStateTransition *p;
for (p = rst; p->from != RUN_STATE__MAX; p++) {
runstate_valid_transitions[p->from][p->to] = true;
}
}
void runstate_replay_enable(void)
{
assert(replay_mode != REPLAY_MODE_NONE);
if (replay_mode == REPLAY_MODE_PLAY) {
/*
* When reverse-debugging, it is possible to move state from
* shutdown to running.
*/
transitions_set_valid(&replay_play_runstate_transitions_def[0]);
}
}
static void runstate_init(void)
{
memset(&runstate_valid_transitions, 0, sizeof(runstate_valid_transitions));
transitions_set_valid(&runstate_transitions_def[0]);
qemu_mutex_init(&vmstop_lock);
}
/* This function will abort() on invalid state transitions */
void runstate_set(RunState new_state)
{
assert(new_state < RUN_STATE__MAX);
trace_runstate_set(current_run_state, RunState_str(current_run_state),
new_state, RunState_str(new_state));
if (current_run_state == new_state) {
return;
}
if (!runstate_valid_transitions[current_run_state][new_state]) {
error_report("invalid runstate transition: '%s' -> '%s'",
RunState_str(current_run_state),
RunState_str(new_state));
abort();
}
current_run_state = new_state;
}
RunState runstate_get(void)
{
return current_run_state;
}
bool runstate_is_running(void)
{
return runstate_check(RUN_STATE_RUNNING);
}
bool runstate_needs_reset(void)
{
return runstate_check(RUN_STATE_INTERNAL_ERROR) ||
runstate_check(RUN_STATE_SHUTDOWN);
}
StatusInfo *qmp_query_status(Error **errp)
{
StatusInfo *info = g_malloc0(sizeof(*info));
info->running = runstate_is_running();
info->status = current_run_state;
return info;
}
bool qemu_vmstop_requested(RunState *r)
{
qemu_mutex_lock(&vmstop_lock);
*r = vmstop_requested;
vmstop_requested = RUN_STATE__MAX;
qemu_mutex_unlock(&vmstop_lock);
return *r < RUN_STATE__MAX;
}
void qemu_system_vmstop_request_prepare(void)
{
qemu_mutex_lock(&vmstop_lock);
}
void qemu_system_vmstop_request(RunState state)
{
vmstop_requested = state;
qemu_mutex_unlock(&vmstop_lock);
qemu_notify_event();
}
struct VMChangeStateEntry {
VMChangeStateHandler *cb;
VMChangeStateHandler *prepare_cb;
void *opaque;
QTAILQ_ENTRY(VMChangeStateEntry) entries;
int priority;
};
static QTAILQ_HEAD(, VMChangeStateEntry) vm_change_state_head =
QTAILQ_HEAD_INITIALIZER(vm_change_state_head);
/**
* qemu_add_vm_change_state_handler_prio:
* @cb: the callback to invoke
* @opaque: user data passed to the callback
* @priority: low priorities execute first when the vm runs and the reverse is
* true when the vm stops
*
* Register a callback function that is invoked when the vm starts or stops
* running.
*
* Returns: an entry to be freed using qemu_del_vm_change_state_handler()
*/
VMChangeStateEntry *qemu_add_vm_change_state_handler_prio(
VMChangeStateHandler *cb, void *opaque, int priority)
{
return qemu_add_vm_change_state_handler_prio_full(cb, NULL, opaque,
priority);
}
/**
* qemu_add_vm_change_state_handler_prio_full:
* @cb: the main callback to invoke
* @prepare_cb: a callback to invoke before the main callback
* @opaque: user data passed to the callbacks
* @priority: low priorities execute first when the vm runs and the reverse is
* true when the vm stops
*
* Register a main callback function and an optional prepare callback function
* that are invoked when the vm starts or stops running. The main callback and
* the prepare callback are called in two separate phases: First all prepare
* callbacks are called and only then all main callbacks are called. As its
* name suggests, the prepare callback can be used to do some preparatory work
* before invoking the main callback.
*
* Returns: an entry to be freed using qemu_del_vm_change_state_handler()
*/
VMChangeStateEntry *
qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb,
VMChangeStateHandler *prepare_cb,
void *opaque, int priority)
{
VMChangeStateEntry *e;
VMChangeStateEntry *other;
e = g_malloc0(sizeof(*e));
e->cb = cb;
e->prepare_cb = prepare_cb;
e->opaque = opaque;
e->priority = priority;
/* Keep list sorted in ascending priority order */
QTAILQ_FOREACH(other, &vm_change_state_head, entries) {
if (priority < other->priority) {
QTAILQ_INSERT_BEFORE(other, e, entries);
return e;
}
}
QTAILQ_INSERT_TAIL(&vm_change_state_head, e, entries);
return e;
}
VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
void *opaque)
{
return qemu_add_vm_change_state_handler_prio(cb, opaque, 0);
}
void qemu_del_vm_change_state_handler(VMChangeStateEntry *e)
{
QTAILQ_REMOVE(&vm_change_state_head, e, entries);
g_free(e);
}
void vm_state_notify(bool running, RunState state)
{
VMChangeStateEntry *e, *next;
trace_vm_state_notify(running, state, RunState_str(state));
if (running) {
QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) {
if (e->prepare_cb) {
e->prepare_cb(e->opaque, running, state);
}
}
QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) {
e->cb(e->opaque, running, state);
}
} else {
QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) {
if (e->prepare_cb) {
e->prepare_cb(e->opaque, running, state);
}
}
QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) {
e->cb(e->opaque, running, state);
}
}
}
static ShutdownCause reset_requested;
static ShutdownCause shutdown_requested;
static int shutdown_exit_code = EXIT_SUCCESS;
static int shutdown_signal;
static pid_t shutdown_pid;
static int powerdown_requested;
static int debug_requested;
static int suspend_requested;
static WakeupReason wakeup_reason;
static NotifierList powerdown_notifiers =
NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
static NotifierList suspend_notifiers =
NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
static NotifierList wakeup_notifiers =
NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
static NotifierList shutdown_notifiers =
NOTIFIER_LIST_INITIALIZER(shutdown_notifiers);
static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE);
ShutdownCause qemu_shutdown_requested_get(void)
{
return shutdown_requested;
}
ShutdownCause qemu_reset_requested_get(void)
{
return reset_requested;
}
static int qemu_shutdown_requested(void)
{
return qatomic_xchg(&shutdown_requested, SHUTDOWN_CAUSE_NONE);
}
static void qemu_kill_report(void)
{
if (!qtest_driver() && shutdown_signal) {
if (shutdown_pid == 0) {
/* This happens for eg ^C at the terminal, so it's worth
* avoiding printing an odd message in that case.
*/
error_report("terminating on signal %d", shutdown_signal);
} else {
char *shutdown_cmd = qemu_get_pid_name(shutdown_pid);
error_report("terminating on signal %d from pid " FMT_pid " (%s)",
shutdown_signal, shutdown_pid,
shutdown_cmd ? shutdown_cmd : "<unknown process>");
g_free(shutdown_cmd);
}
shutdown_signal = 0;
}
}
static ShutdownCause qemu_reset_requested(void)
{
ShutdownCause r = reset_requested;
if (r && replay_checkpoint(CHECKPOINT_RESET_REQUESTED)) {
reset_requested = SHUTDOWN_CAUSE_NONE;
return r;
}
return SHUTDOWN_CAUSE_NONE;
}
static int qemu_suspend_requested(void)
{
int r = suspend_requested;
if (r && replay_checkpoint(CHECKPOINT_SUSPEND_REQUESTED)) {
suspend_requested = 0;
return r;
}
return false;
}
static WakeupReason qemu_wakeup_requested(void)
{
return wakeup_reason;
}
static int qemu_powerdown_requested(void)
{
int r = powerdown_requested;
powerdown_requested = 0;
return r;
}
static int qemu_debug_requested(void)
{
int r = debug_requested;
debug_requested = 0;
return r;
}
/*
* Reset the VM. Issue an event unless @reason is SHUTDOWN_CAUSE_NONE.
*/
void qemu_system_reset(ShutdownCause reason)
{
MachineClass *mc;
ResetType type;
mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;
cpu_synchronize_all_states();
switch (reason) {
case SHUTDOWN_CAUSE_SNAPSHOT_LOAD:
type = RESET_TYPE_SNAPSHOT_LOAD;
break;
default:
type = RESET_TYPE_COLD;
}
if (mc && mc->reset) {
mc->reset(current_machine, type);
} else {
qemu_devices_reset(type);
}
switch (reason) {
case SHUTDOWN_CAUSE_NONE:
case SHUTDOWN_CAUSE_SUBSYSTEM_RESET:
case SHUTDOWN_CAUSE_SNAPSHOT_LOAD:
break;
default:
qapi_event_send_reset(shutdown_caused_by_guest(reason), reason);
}
/*
* Some boards use the machine reset callback to point CPUs to the firmware
* entry point. Assume that this is not the case for boards that support
* non-resettable CPUs (currently used only for confidential guests), in
* which case cpu_synchronize_all_post_init() is enough because
* it does _more_ than cpu_synchronize_all_post_reset().
*/
if (cpus_are_resettable()) {
cpu_synchronize_all_post_reset();
} else {
assert(runstate_check(RUN_STATE_PRELAUNCH));
}
vm_set_suspended(false);
}
/*
* Wake the VM after suspend.
*/
static void qemu_system_wakeup(void)
{
MachineClass *mc;
mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;
if (mc && mc->wakeup) {
mc->wakeup(current_machine);
}
}
void qemu_system_guest_panicked(GuestPanicInformation *info)
{
qemu_log_mask(LOG_GUEST_ERROR, "Guest crashed");
if (current_cpu) {
current_cpu->crash_occurred = true;
}
/*
* TODO: Currently the available panic actions are: none, pause, and
* shutdown, but in principle debug and reset could be supported as well.
* Investigate any potential use cases for the unimplemented actions.
*/
if (panic_action == PANIC_ACTION_PAUSE
|| (panic_action == PANIC_ACTION_SHUTDOWN && shutdown_action == SHUTDOWN_ACTION_PAUSE)) {
qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE, info);
vm_stop(RUN_STATE_GUEST_PANICKED);
} else if (panic_action == PANIC_ACTION_SHUTDOWN ||
panic_action == PANIC_ACTION_EXIT_FAILURE) {
qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_POWEROFF, info);
vm_stop(RUN_STATE_GUEST_PANICKED);
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC);
} else {
qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_RUN, info);
}
if (info) {
if (info->type == GUEST_PANIC_INFORMATION_TYPE_HYPER_V) {
qemu_log_mask(LOG_GUEST_ERROR, "\nHV crash parameters: (%#"PRIx64
" %#"PRIx64" %#"PRIx64" %#"PRIx64" %#"PRIx64")\n",
info->u.hyper_v.arg1,
info->u.hyper_v.arg2,
info->u.hyper_v.arg3,
info->u.hyper_v.arg4,
info->u.hyper_v.arg5);
} else if (info->type == GUEST_PANIC_INFORMATION_TYPE_S390) {
qemu_log_mask(LOG_GUEST_ERROR, " on cpu %d: %s\n"
"PSW: 0x%016" PRIx64 " 0x%016" PRIx64"\n",
info->u.s390.core,
S390CrashReason_str(info->u.s390.reason),
info->u.s390.psw_mask,
info->u.s390.psw_addr);
}
qapi_free_GuestPanicInformation(info);
}
}
void qemu_system_guest_crashloaded(GuestPanicInformation *info)
{
qemu_log_mask(LOG_GUEST_ERROR, "Guest crash loaded");
qapi_event_send_guest_crashloaded(GUEST_PANIC_ACTION_RUN, info);
qapi_free_GuestPanicInformation(info);
}
void qemu_system_guest_pvshutdown(void)
{
qapi_event_send_guest_pvshutdown();
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
void qemu_system_reset_request(ShutdownCause reason)
{
if (reboot_action == REBOOT_ACTION_SHUTDOWN &&
reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) {
shutdown_requested = reason;
} else if (!cpus_are_resettable()) {
error_report("cpus are not resettable, terminating");
shutdown_requested = reason;
} else {
reset_requested = reason;
}
cpu_stop_current();
qemu_notify_event();
}
static void qemu_system_suspend(void)
{
pause_all_vcpus();
notifier_list_notify(&suspend_notifiers, NULL);
runstate_set(RUN_STATE_SUSPENDED);
qapi_event_send_suspend();
}
void qemu_system_suspend_request(void)
{
if (runstate_check(RUN_STATE_SUSPENDED)) {
return;
}
suspend_requested = 1;
cpu_stop_current();
qemu_notify_event();
}
void qemu_register_suspend_notifier(Notifier *notifier)
{
notifier_list_add(&suspend_notifiers, notifier);
}
void qemu_system_wakeup_request(WakeupReason reason, Error **errp)
{
trace_system_wakeup_request(reason);
if (!runstate_check(RUN_STATE_SUSPENDED)) {
error_setg(errp,
"Unable to wake up: guest is not in suspended state");
return;
}
if (!(wakeup_reason_mask & (1 << reason))) {
return;
}
runstate_set(RUN_STATE_RUNNING);
wakeup_reason = reason;
qemu_notify_event();
}
void qemu_system_wakeup_enable(WakeupReason reason, bool enabled)
{
if (enabled) {
wakeup_reason_mask |= (1 << reason);
} else {
wakeup_reason_mask &= ~(1 << reason);
}
}
void qemu_register_wakeup_notifier(Notifier *notifier)
{
notifier_list_add(&wakeup_notifiers, notifier);
}
static bool wakeup_suspend_enabled;
void qemu_register_wakeup_support(void)
{
wakeup_suspend_enabled = true;
}
bool qemu_wakeup_suspend_enabled(void)
{
return wakeup_suspend_enabled;
}
void qemu_system_killed(int signal, pid_t pid)
{
shutdown_signal = signal;
shutdown_pid = pid;
shutdown_action = SHUTDOWN_ACTION_POWEROFF;
/* Cannot call qemu_system_shutdown_request directly because
* we are in a signal handler.
*/
shutdown_requested = SHUTDOWN_CAUSE_HOST_SIGNAL;
qemu_notify_event();
}
void qemu_system_shutdown_request_with_code(ShutdownCause reason,
int exit_code)
{
shutdown_exit_code = exit_code;
qemu_system_shutdown_request(reason);
}
void qemu_system_shutdown_request(ShutdownCause reason)
{
trace_qemu_system_shutdown_request(reason);
replay_shutdown_request(reason);
shutdown_requested = reason;
qemu_notify_event();
}
static void qemu_system_powerdown(void)
{
qapi_event_send_powerdown();
notifier_list_notify(&powerdown_notifiers, NULL);
}
static void qemu_system_shutdown(ShutdownCause cause)
{
qapi_event_send_shutdown(shutdown_caused_by_guest(cause), cause);
notifier_list_notify(&shutdown_notifiers, &cause);
}
void qemu_system_powerdown_request(void)
{
trace_qemu_system_powerdown_request();
powerdown_requested = 1;
qemu_notify_event();
}
void qemu_register_powerdown_notifier(Notifier *notifier)
{
notifier_list_add(&powerdown_notifiers, notifier);
}
void qemu_register_shutdown_notifier(Notifier *notifier)
{
notifier_list_add(&shutdown_notifiers, notifier);
}
void qemu_system_debug_request(void)
{
debug_requested = 1;
qemu_notify_event();
}
static bool main_loop_should_exit(int *status)
{
RunState r;
ShutdownCause request;
if (qemu_debug_requested()) {
vm_stop(RUN_STATE_DEBUG);
}
if (qemu_suspend_requested()) {
qemu_system_suspend();
}
request = qemu_shutdown_requested();
if (request) {
qemu_kill_report();
qemu_system_shutdown(request);
if (shutdown_action == SHUTDOWN_ACTION_PAUSE) {
vm_stop(RUN_STATE_SHUTDOWN);
} else {
if (shutdown_exit_code != EXIT_SUCCESS) {
*status = shutdown_exit_code;
} else if (request == SHUTDOWN_CAUSE_GUEST_PANIC &&
panic_action == PANIC_ACTION_EXIT_FAILURE) {
*status = EXIT_FAILURE;
}
return true;
}
}
request = qemu_reset_requested();
if (request) {
pause_all_vcpus();
qemu_system_reset(request);
resume_all_vcpus();
/*
* runstate can change in pause_all_vcpus()
* as iothread mutex is unlocked
*/
if (!runstate_check(RUN_STATE_RUNNING) &&
!runstate_check(RUN_STATE_INMIGRATE) &&
!runstate_check(RUN_STATE_FINISH_MIGRATE)) {
runstate_set(RUN_STATE_PRELAUNCH);
}
}
if (qemu_wakeup_requested()) {
pause_all_vcpus();
qemu_system_wakeup();
notifier_list_notify(&wakeup_notifiers, &wakeup_reason);
wakeup_reason = QEMU_WAKEUP_REASON_NONE;
resume_all_vcpus();
qapi_event_send_wakeup();
}
if (qemu_powerdown_requested()) {
qemu_system_powerdown();
}
if (qemu_vmstop_requested(&r)) {
vm_stop(r);
}
return false;
}
int qemu_main_loop(void)
{
int status = EXIT_SUCCESS;
while (!main_loop_should_exit(&status)) {
main_loop_wait(false);
}
return status;
}
void qemu_add_exit_notifier(Notifier *notify)
{
notifier_list_add(&exit_notifiers, notify);
}
void qemu_remove_exit_notifier(Notifier *notify)
{
notifier_remove(notify);
}
static void qemu_run_exit_notifiers(void)
{
notifier_list_notify(&exit_notifiers, NULL);
}
void qemu_init_subsystems(void)
{
Error *err = NULL;
os_set_line_buffering();
module_call_init(MODULE_INIT_TRACE);
qemu_init_cpu_list();
qemu_init_cpu_loop();
bql_lock();
atexit(qemu_run_exit_notifiers);
module_call_init(MODULE_INIT_QOM);
module_call_init(MODULE_INIT_MIGRATION);
runstate_init();
precopy_infrastructure_init();
postcopy_infrastructure_init();
monitor_init_globals();
if (qcrypto_init(&err) < 0) {
error_reportf_err(err, "cannot initialize crypto: ");
exit(1);
}
os_setup_early_signal_handling();
bdrv_init_with_whitelist();
socket_init();
}
void qemu_cleanup(int status)
{
gdb_exit(status);
/*
* cleaning up the migration object cancels any existing migration
* try to do this early so that it also stops using devices.
*/
migration_shutdown();
/*
* Close the exports before draining the block layer. The export
* drivers may have coroutines yielding on it, so we need to clean
* them up before the drain, as otherwise they may be get stuck in
* blk_wait_while_drained().
*/
blk_exp_close_all();
/* No more vcpu or device emulation activity beyond this point */
vm_shutdown();
replay_finish();
/*
* We must cancel all block jobs while the block layer is drained,
* or cancelling will be affected by throttling and thus may block
* for an extended period of time.
* Begin the drained section after vm_shutdown() to avoid requests being
* stuck in the BlockBackend's request queue.
* We do not need to end this section, because we do not want any
* requests happening from here on anyway.
*/
bdrv_drain_all_begin();
job_cancel_sync_all();
bdrv_close_all();
/* vhost-user must be cleaned up before chardevs. */
tpm_cleanup();
net_cleanup();
audio_cleanup();
monitor_cleanup();
qemu_chr_cleanup();
user_creatable_cleanup();
/* TODO: unref root container, check all devices are ok */
}
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