Its simpler to handle these events from only one context.

Index: qemu/vl.c
===================================================================
--- qemu.orig/vl.c
+++ qemu/vl.c
@@ -3540,22 +3540,19 @@ void qemu_system_reset_request(void)
     } else {
         reset_requested = 1;
     }
-    if (cpu_single_env)
-        cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+    main_loop_break();
 }
 
 void qemu_system_shutdown_request(void)
 {
     shutdown_requested = 1;
-    if (cpu_single_env)
-        cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+    main_loop_break();
 }
 
 void qemu_system_powerdown_request(void)
 {
     powerdown_requested = 1;
-    if (cpu_single_env)
-        cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+    main_loop_break();
 }
 
 #ifdef _WIN32
@@ -3921,25 +3918,6 @@ static void *cpu_main_loop(void *arg)
             }
             cur_cpu = env;
 
-            if (shutdown_requested) {
-                ret = EXCP_INTERRUPT;
-                if (no_shutdown) {
-                    vm_stop(0);
-                    no_shutdown = 0;
-                }
-                else
-                    break;
-            }
-            if (reset_requested) {
-                reset_requested = 0;
-                qemu_system_reset();
-                ret = EXCP_INTERRUPT;
-            }
-            if (powerdown_requested) {
-                powerdown_requested = 0;
-		qemu_system_powerdown();
-                ret = EXCP_INTERRUPT;
-            }
             if (unlikely(ret == EXCP_DEBUG)) {
                 gdb_set_stop_cpu(cur_cpu);
                 vm_stop(EXCP_DEBUG);
@@ -3987,10 +3965,6 @@ static void *cpu_main_loop(void *arg)
                 timeout = 0;
             }
         } else {
-            if (shutdown_requested) {
-                ret = EXCP_INTERRUPT;
-                break;
-            }
             timeout = 5000;
         }
 #ifdef CONFIG_PROFILER
@@ -4017,8 +3991,18 @@ static void main_loop(void)
 
     qemu_thread_create(&cpus_thread, cpu_main_loop, NULL);
 
-    while (1)
+    while (1) {
         main_loop_wait(1000);
+        if (qemu_shutdown_requested()) {
+            if (no_shutdown)
+                no_shutdown = 0;
+            else
+                    break;
+        } else if (qemu_powerdown_requested())
+            qemu_system_powerdown();
+        else if (qemu_reset_requested())
+            qemu_system_reset();
+    }
 }
 
 static void help(int exitcode)

--