[PATCH V3 01/10] vl: start on wakeup request

[Steve Sistare <steven.sistare@oracle.com>]

If qemu starts and loads a VM in the suspended state, then a later wakeup
request directly sets the state to running.  This skips vm_start() and its
initialization steps, which is fatal for the guest.  See
qemu_system_wakeup_request(), and qemu_system_wakeup() in
main_loop_should_exit().

Remember if vm_start has been called.  If not, then call vm_start from
qemu_system_wakeup_request.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
---
 include/sysemu/runstate.h |  1 +
 softmmu/cpus.c            | 12 ++++++++++++
 softmmu/runstate.c        |  2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h
index 7beb29c..42ddf83 100644
--- a/include/sysemu/runstate.h
+++ b/include/sysemu/runstate.h
@@ -34,6 +34,7 @@ static inline bool shutdown_caused_by_guest(ShutdownCause cause)
 }
 
 void vm_start(void);
+void vm_wakeup(void);
 
 /**
  * vm_prepare_start: Prepare for starting/resuming the VM
diff --git a/softmmu/cpus.c b/softmmu/cpus.c
index fed20ff..fa9e5ba 100644
--- a/softmmu/cpus.c
+++ b/softmmu/cpus.c
@@ -66,6 +66,7 @@
 #endif /* CONFIG_LINUX */
 
 static QemuMutex qemu_global_mutex;
+static bool vm_started;
 
 /*
  * The chosen accelerator is supposed to register this.
@@ -264,6 +265,7 @@ static int do_vm_stop(RunState state, bool send_stop)
         if (send_stop) {
             qapi_event_send_stop();
         }
+        vm_started = false;
     }
 
     bdrv_drain_all();
@@ -722,6 +724,16 @@ void vm_start(void)
 {
     if (!vm_prepare_start(false)) {
         resume_all_vcpus();
+        vm_started = true;
+    }
+}
+
+void vm_wakeup(void)
+{
+    if (!vm_started) {
+        vm_start();
+    } else {
+        runstate_set(RUN_STATE_RUNNING);
     }
 }
 
diff --git a/softmmu/runstate.c b/softmmu/runstate.c
index f3bd862..95c6ae7 100644
--- a/softmmu/runstate.c
+++ b/softmmu/runstate.c
@@ -580,7 +580,7 @@ void qemu_system_wakeup_request(WakeupReason reason, Error **errp)
     if (!(wakeup_reason_mask & (1 << reason))) {
         return;
     }
-    runstate_set(RUN_STATE_RUNNING);
+    vm_wakeup();
     wakeup_reason = reason;
     qemu_notify_event();
 }
-- 
1.8.3.1