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suspend: add infrastructure 

This patch adds some infrastructure to handle suspend and resume to
qemu.  First there are two functions to switch state and second there
is a suspend notifier:

 * qemu_system_suspend_request is supposed to be called when the
   guest asks for being be suspended, for example via ACPI.

 * qemu_system_wakeup_request is supposed to be called on events
   which should wake up the guest.

 * qemu_register_suspend_notifier can be used to register a notifier
   which will be called when the guest is suspended.  Machine types
   and device models can hook in there to modify state if needed.

 * qemu_register_wakeup_notifier can be used to register a notifier
   which will be called when the guest is woken up.  Machine types
   and device models can hook in there to modify state if needed.

 * qemu_system_wakeup_enable can be used to enable/disable wakeup
   events.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann 2012-02-23 13:45:19 +01:00 committed by Anthony Liguori
parent 8283c4f565
commit 95b363b5c6
2 changed files with 76 additions and 0 deletions
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9
sysemu.h
View File

@ -38,7 +38,16 @@ void vm_start(void);
void vm_stop(RunState state);
void vm_stop_force_state(RunState state);
typedef enum WakeupReason {
QEMU_WAKEUP_REASON_OTHER = 0,
} WakeupReason;
void qemu_system_reset_request(void);
void qemu_system_suspend_request(void);
void qemu_register_suspend_notifier(Notifier *notifier);
void qemu_system_wakeup_request(WakeupReason reason);
void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
void qemu_register_wakeup_notifier(Notifier *notifier);
void qemu_system_shutdown_request(void);
void qemu_system_powerdown_request(void);
void qemu_system_debug_request(void);

67
vl.c
View File

@ -1283,6 +1283,13 @@ static int shutdown_requested, shutdown_signal = -1;
static pid_t shutdown_pid;
static int powerdown_requested;
static int debug_requested;
static int suspend_requested;
static bool is_suspended;
static NotifierList suspend_notifiers =
NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
static NotifierList wakeup_notifiers =
NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
static uint32_t wakeup_reason_mask = ~0;
static RunState vmstop_requested = RUN_STATE_MAX;
int qemu_shutdown_requested_get(void)
@ -1325,6 +1332,13 @@ int qemu_reset_requested(void)
return r;
}
static int qemu_suspend_requested(void)
{
int r = suspend_requested;
suspend_requested = 0;
return r;
}
int qemu_powerdown_requested(void)
{
int r = powerdown_requested;
@ -1398,6 +1412,56 @@ void qemu_system_reset_request(void)
qemu_notify_event();
}
static void qemu_system_suspend(void)
{
pause_all_vcpus();
notifier_list_notify(&suspend_notifiers, NULL);
is_suspended = true;
}
void qemu_system_suspend_request(void)
{
if (is_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)
{
if (!is_suspended) {
return;
}
if (!(wakeup_reason_mask & (1 << reason))) {
return;
}
notifier_list_notify(&wakeup_notifiers, &reason);
reset_requested = 1;
qemu_notify_event();
is_suspended = false;
}
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);
}
void qemu_system_killed(int signal, pid_t pid)
{
shutdown_signal = signal;
@ -1438,6 +1502,9 @@ static bool main_loop_should_exit(void)
if (qemu_debug_requested()) {
vm_stop(RUN_STATE_DEBUG);
}
if (qemu_suspend_requested()) {
qemu_system_suspend();
}
if (qemu_shutdown_requested()) {
qemu_kill_report();
monitor_protocol_event(QEVENT_SHUTDOWN, NULL);