vl: extract softmmu/runstate.c

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 800 insertions, 0 deletions

diff --git a/softmmu/runstate.c b/softmmu/runstate.c
new file mode 100644
index 0000000000..892f2f679f
--- /dev/null
+++ b/softmmu/runstate.c
@@ -0,0 +1,800 @@
+/*
+ * 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 "chardev/char.h"
+#include "crypto/cipher.h"
+#include "crypto/init.h"
+#include "exec/cpu-common.h"
+#include "exec/exec-all.h"
+#include "exec/gdbstub.h"
+#include "hw/boards.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-common.h"
+#include "qemu/error-report.h"
+#include "qemu/job.h"
+#include "qemu/module.h"
+#include "qemu/plugin.h"
+#include "qemu/sockets.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/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_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_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_RESTORE_VM, RUN_STATE_RUNNING },
+    { RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH },
+
+    { RUN_STATE_COLO, RUN_STATE_RUNNING },
+
+    { 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_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_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 bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX];
+
+bool runstate_check(RunState state)
+{
+    return current_run_state == state;
+}
+
+bool runstate_store(char *str, size_t size)
+{
+    const char *state = RunState_str(current_run_state);
+    size_t len = strlen(state) + 1;
+
+    if (len > size) {
+        return false;
+    }
+    memcpy(str, state, len);
+    return true;
+}
+
+static void runstate_init(void)
+{
+    const RunStateTransition *p;
+
+    memset(&runstate_valid_transitions, 0, sizeof(runstate_valid_transitions));
+    for (p = &runstate_transitions_def[0]; p->from != RUN_STATE__MAX; p++) {
+        runstate_valid_transitions[p->from][p->to] = true;
+    }
+
+    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;
+}
+
+int 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->singlestep = singlestep;
+    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;
+    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)
+{
+    VMChangeStateEntry *e;
+    VMChangeStateEntry *other;
+
+    e = g_malloc0(sizeof(*e));
+    e->cb = 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(int 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) {
+            e->cb(e->opaque, running, state);
+        }
+    } else {
+        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_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;
+
+    mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;
+
+    cpu_synchronize_all_states();
+
+    if (mc && mc->reset) {
+        mc->reset(current_machine);
+    } else {
+        qemu_devices_reset();
+    }
+    if (reason && reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) {
+        qapi_event_send_reset(shutdown_caused_by_guest(reason), reason);
+    }
+    cpu_synchronize_all_post_reset();
+}
+
+/*
+ * 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;
+    }
+    qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE,
+                                   !!info, info);
+    vm_stop(RUN_STATE_GUEST_PANICKED);
+    if (!no_shutdown) {
+        qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_POWEROFF,
+                                       !!info, info);
+        qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC);
+    }
+
+    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, info);
+
+    if (info) {
+        qapi_free_GuestPanicInformation(info);
+    }
+}
+
+void qemu_system_reset_request(ShutdownCause reason)
+{
+    if (no_reboot && reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) {
+        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;
+    no_shutdown = 0;
+
+    /* 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(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(void)
+{
+    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 (no_shutdown) {
+            vm_stop(RUN_STATE_SHUTDOWN);
+        } else {
+            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;
+}
+
+void qemu_main_loop(void)
+{
+#ifdef CONFIG_PROFILER
+    int64_t ti;
+#endif
+    while (!main_loop_should_exit()) {
+#ifdef CONFIG_PROFILER
+        ti = profile_getclock();
+#endif
+        main_loop_wait(false);
+#ifdef CONFIG_PROFILER
+        dev_time += profile_getclock() - ti;
+#endif
+    }
+}
+
+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;
+
+    os_set_line_buffering();
+
+    module_call_init(MODULE_INIT_TRACE);
+
+    qemu_init_cpu_list();
+    qemu_init_cpu_loop();
+    qemu_mutex_lock_iothread();
+
+    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(void)
+{
+    gdbserver_cleanup();
+
+    /*
+     * cleaning up the migration object cancels any existing migration
+     * try to do this early so that it also stops using devices.
+     */
+    migration_shutdown();
+
+    /*
+     * 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.
+     * vm_shutdown() will bdrv_drain_all(), so we may as well include
+     * it in the drained section.
+     * We do not need to end this section, because we do not want any
+     * requests happening from here on anyway.
+     */
+    bdrv_drain_all_begin();
+
+    /* No more vcpu or device emulation activity beyond this point */
+    vm_shutdown();
+    replay_finish();
+
+    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 */
+}