From b781a3ebcec9b85e165201d851a77623b11cbe0f Mon Sep 17 00:00:00 2001
From: Alwin Berger <alwin.berger@tu-dortmund.de>
Date: Sun, 9 Jan 2022 22:44:41 +0100
Subject: [PATCH] EXPERIMENT: don't flush tbs on loadvm

This should speed up fuzzing somewhat, but could also create
use-after-free bugs.
---
 cpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cpu.c b/cpu.c
index 7dd96b7dbf..eaa40ee55d 100644
--- a/cpu.c
+++ b/cpu.c
@@ -239,7 +239,12 @@ static int cpu_common_post_load(void *opaque, int version_id)
      * memory we've translated code from. So we must flush all TBs,
      * which will now be stale.
      */
+    /* Begin LibAFL instrumentation */
+    // Do not flush old tbs on loadvm, when fuzzing in system-mode
+#if !defined(CONFIG_USER_ONLY) && defined(AS_SHARED_LIB)
     tb_flush(cpu);
+#endif
+    /* End LibAFL instrumentation */
 
     return 0;
 }