Necessary for the next refactoring patch.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: qemu-iothread-4/vl.c
===================================================================
--- qemu-iothread-4.orig/vl.c
+++ qemu-iothread-4/vl.c
@@ -3504,6 +3504,7 @@ static QEMUResetEntry *first_reset_entry
 static int reset_requested;
 static int shutdown_requested;
 static int powerdown_requested;
+static int debug_requested;
 
 int qemu_shutdown_requested(void)
 {
@@ -3526,6 +3527,13 @@ int qemu_powerdown_requested(void)
     return r;
 }
 
+static int qemu_debug_requested(void)
+{
+    int r = debug_requested;
+    debug_requested = 0;
+    return r;
+}
+
 void qemu_register_reset(QEMUResetHandler *func, void *opaque)
 {
     QEMUResetEntry **pre, *re;
@@ -3955,6 +3963,8 @@ static int vm_can_run(void)
         return 0;
     if (shutdown_requested)
         return 0;
+    if (debug_requested)
+        return 0;
     return 1;
 }
 
@@ -3981,6 +3991,7 @@ static void main_loop(void)
                 ret = qemu_cpu_exec(env);
                 if (ret == EXCP_DEBUG) {
                     gdb_set_stop_cpu(env);
+                    debug_requested = 1;
                     break;
                 }
             }
@@ -3991,11 +4002,11 @@ static void main_loop(void)
 #ifdef CONFIG_PROFILER
             dev_time += profile_getclock() - ti;
 #endif
-        } while (ret != EXCP_DEBUG && vm_can_run());
+        } while (vm_can_run());
 
-        if (ret == EXCP_DEBUG)
-            vm_stop(EXCP_DEBUG);
 
+        if (qemu_debug_requested())
+            vm_stop(EXCP_DEBUG);
         if (qemu_shutdown_requested()) {
             if (no_shutdown) {
                 vm_stop(0);

--