[Qemu-devel] [RFC PATCH 1/5] suspend: add infrastructure

[Gerd Hoffmann <kraxel@redhat.com>]

This patch adds qemu_system_suspend_request() and void
qemu_system_wakeup_request() functions to qemu.

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.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 sysemu.h |    2 ++
 vl.c     |   21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/sysemu.h b/sysemu.h
index 3806901..d1834a0 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -39,6 +39,8 @@ void vm_stop(RunState state);
 void vm_stop_force_state(RunState state);
 
 void qemu_system_reset_request(void);
+void qemu_system_suspend_request(qemu_irq wake_irq);
+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..26413e3 100644
--- a/vl.c
+++ b/vl.c
@@ -1282,6 +1282,7 @@ static int shutdown_requested, shutdown_signal = -1;
 static pid_t shutdown_pid;
 static int powerdown_requested;
 static int debug_requested;
+static qemu_irq suspend_wake_irq;
 static RunState vmstop_requested = RUN_STATE_MAX;
 
 int qemu_shutdown_requested_get(void)
@@ -1397,6 +1398,26 @@ void qemu_system_reset_request(void)
     qemu_notify_event();
 }
 
+void qemu_system_suspend_request(qemu_irq wake_irq)
+{
+    if (suspend_wake_irq != NULL) {
+        return;
+    }
+    cpu_stop_current();
+    qemu_notify_event();
+    suspend_wake_irq = wake_irq;
+}
+
+void qemu_system_wakeup_request(void)
+{
+    if (suspend_wake_irq == NULL) {
+        return;
+    }
+    reset_requested = 1;
+    qemu_irq_raise(suspend_wake_irq);
+    suspend_wake_irq = NULL;
+}
+
 void qemu_system_killed(int signal, pid_t pid)
 {
     shutdown_signal = signal;
-- 
1.7.1