1 files changed, 14 insertions, 0 deletions
diff --git a/exec-all.h b/exec-all.h
index 1120f84661..72ef246793 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -356,4 +356,18 @@ extern int singlestep;
 /* cpu-exec.c */
 extern volatile sig_atomic_t exit_request;
 
+/* Deterministic execution requires that IO only be performed on the last
+   instruction of a TB so that interrupts take effect immediately.  */
+static inline int can_do_io(CPUState *env)
+{
+    if (!use_icount) {
+        return 1;
+    }
+    /* If not executing code then assume we are ok.  */
+    if (!env->current_tb) {
+        return 1;
+    }
+    return env->can_do_io != 0;
+}
+
 #endif