Mailing List Archive

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.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
sysemu.h | 3 +++
vl.c | 28 ++++++++++++++++++++++++++++
2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/sysemu.h b/sysemu.h
index ddef2bb..22470a3 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -39,6 +39,9 @@ void vm_stop(RunState state);
void vm_stop_force_state(RunState state);

void qemu_system_reset_request(void);
+void qemu_system_suspend_request(void);
+void qemu_register_suspend_notifier(Notifier *notifier);
+void qemu_system_wakeup_request(void);
void qemu_system_shutdown_request(void);
void qemu_system_powerdown_request(void);
void qemu_system_debug_request(void);
diff --git a/vl.c b/vl.c
index ba55b35..755cd67 100644
--- a/vl.c
+++ b/vl.c
@@ -1282,6 +1282,9 @@ static int shutdown_requested, shutdown_signal = -1;
static pid_t shutdown_pid;
static int powerdown_requested;
static int debug_requested;
+static bool is_suspended;
+static NotifierList suspend_notifiers =
+ NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
static RunState vmstop_requested = RUN_STATE_MAX;

int qemu_shutdown_requested_get(void)
@@ -1397,6 +1400,31 @@ void qemu_system_reset_request(void)
qemu_notify_event();
}

+void qemu_system_suspend_request(void)
+{
+ if (is_suspended) {
+ return;
+ }
+ cpu_stop_current();
+ notifier_list_notify(&suspend_notifiers, NULL);
+ is_suspended = true;
+}
+
+void qemu_register_suspend_notifier(Notifier *notifier)
+{
+ notifier_list_add(&suspend_notifiers, notifier);
+}
+
+void qemu_system_wakeup_request(void)
+{
+ if (!is_suspended) {
+ return;
+ }
+ reset_requested = 1;
+ qemu_notify_event();
+ is_suspended = false;
+}
+
void qemu_system_killed(int signal, pid_t pid)
{
shutdown_signal = signal;
--
1.7.1


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel