runstate: Allow user to migrate twice

It should be a matter of allowing the transition POSTMIGRATE ->
FINISH_MIGRATE, but it turns out that the VM won't do the
transition the second time because it's already stopped.

So this commit also adds vm_stop_force_state() which performs
the transition even if the VM is already stopped.

While there also allow other states to migrate.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/cpus.c b/cpus.c
index 89787794e8..5f5b763e2c 100644
--- a/cpus.c
+++ b/cpus.c
@@ -887,6 +887,17 @@ void vm_stop(RunState state)
     do_vm_stop(state);
 }
 
+/* does a state transition even if the VM is already stopped,
+   current state is forgotten forever */
+void vm_stop_force_state(RunState state)
+{
+    if (runstate_is_running()) {
+        vm_stop(state);
+    } else {
+        runstate_set(state);
+    }
+}
+
 static int tcg_cpu_exec(CPUState *env)
 {
     int ret;