fix migration to obey -S

Since migration returns right away, starting the VM right
after calling qemu_start_incoming_migration is wrong even
if -S is not passed.  We have to do this after migration
has completed.

Cc: Glauber Costa  <glommer@redhat.com>
Cc: Anthony Liguori  <aliguori@us.ibm.com>

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Glauber Costa <glommer@redhat.com>

migration-exec.c

@@ -122,6 +122,8 @@ static void exec_accept_incoming_migration(void *opaque)
     dprintf("successfully loaded vm state\n");
     /* we've successfully migrated, close the fd */
     qemu_set_fd_handler2(qemu_popen_fd(f), NULL, NULL, NULL, NULL);
+    if (autostart)
+        vm_start();
 
 err:
     qemu_fclose(f);

migration-tcp.c

@@ -170,6 +170,8 @@ static void tcp_accept_incoming_migration(void *opaque)
     /* we've successfully migrated, close the server socket */
     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
     close(s);
+    if (autostart)
+        vm_start();
 
 out_fopen:
     qemu_fclose(f);

sysemu.h

@@ -77,6 +77,7 @@ int tap_win32_init(VLANState *vlan, const char *model,
 /* SLIRP */
 void do_info_slirp(void);
 
+extern int autostart;
 extern int bios_size;
 extern int cirrus_vga_enabled;
 extern int std_vga_enabled;

vl.c

@@ -201,7 +201,7 @@ ram_addr_t ram_size;
 int nb_nics;
 NICInfo nd_table[MAX_NICS];
 int vm_running;
-static int autostart;
+int autostart;
 static int rtc_utc = 1;
 static int rtc_date_offset = -1; /* -1 means no change */
 int cirrus_vga_enabled = 1;
@@ -5726,7 +5726,7 @@ int main(int argc, char **argv, char **envp)
         qemu_start_incoming_migration(incoming);
     }
 
-    if (autostart)
+    else if (autostart)
         vm_start();
 
     if (daemonize) {