diff --git a/executer/include/uprotocol.h b/executer/include/uprotocol.h
index dec38125..13ada852 100644
--- a/executer/include/uprotocol.h
+++ b/executer/include/uprotocol.h
@@ -172,6 +172,7 @@ struct program_load_desc {
 #ifdef ENABLE_TOFU
 	int enable_tofu;
 #endif
+	unsigned long mcexec_flags;
 	int nr_processes;
 	int process_rank;
 	__cpu_set_unit cpu_set[PLD_CPU_SET_SIZE];
diff --git a/executer/user/mcexec.c b/executer/user/mcexec.c
index 397e744f..9c78e2a6 100644
--- a/executer/user/mcexec.c
+++ b/executer/user/mcexec.c
@@ -207,6 +207,7 @@ static int enable_uti = 0;
 #ifdef ENABLE_TOFU
 static int enable_tofu = 0;
 #endif
+static unsigned long mcexec_flags = 0;
 
 /* Partitioned execution (e.g., for MPI) */
 static int nr_processes = 0;
@@ -1803,6 +1804,12 @@ static struct option mcexec_options[] = {
 		.flag =		&debug,
 		.val =		1,
 	},
+	{
+		.name =		"flags",
+		.has_arg =	required_argument,
+		.flag =		NULL,
+		.val =		'f',
+	},
 	/* end */
 	{ NULL, 0, NULL, 0, },
 };
@@ -2184,10 +2191,10 @@ int main(int argc, char **argv)
 
 	/* Parse options ("+" denotes stop at the first non-option) */
 #ifdef ADD_ENVS_OPTION
-	while ((opt = getopt_long(argc, argv, "+c:n:t:M:h:e:s:m:u:S:",
+	while ((opt = getopt_long(argc, argv, "+c:n:t:M:h:e:s:m:u:S:f:",
 				  mcexec_options, NULL)) != -1) {
 #else /* ADD_ENVS_OPTION */
-	while ((opt = getopt_long(argc, argv, "+c:n:t:M:h:s:m:u:S:",
+	while ((opt = getopt_long(argc, argv, "+c:n:t:M:h:s:m:u:S:f:",
 				  mcexec_options, NULL)) != -1) {
 #endif /* ADD_ENVS_OPTION */
 		switch (opt) {
@@ -2262,6 +2269,10 @@ int main(int argc, char **argv)
 				uti_thread_rank = atoi(optarg);
 				break;
 
+			case 'f':
+				mcexec_flags = strtoul(optarg, NULL, 16);
+				break;
+
 			case 0:	/* long opt */
 				break;
 
@@ -2415,6 +2426,8 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
+	desc->mcexec_flags = 0;
+
 #ifdef ADD_ENVS_OPTION
 	/* Collect environment variables */
 	for (i = 0; environ[i]; i++) {
@@ -2827,6 +2840,14 @@ int main(int argc, char **argv)
 	desc->enable_tofu = enable_tofu;
 #endif
 
+	/*
+	 * Override mcexec_flags, if explicitly set.
+	 * This must be right before prepare image.
+	 */
+	if (mcexec_flags) {
+		desc->mcexec_flags = mcexec_flags;
+	}
+
 	/* user_start and user_end are set by this call */
 	if (ioctl(fd, MCEXEC_UP_PREPARE_IMAGE, (unsigned long)desc) != 0) {
 		perror("prepare");
diff --git a/kernel/host.c b/kernel/host.c
index 88f9cd73..7241307e 100644
--- a/kernel/host.c
+++ b/kernel/host.c
@@ -589,6 +589,10 @@ static int process_msg_prepare_process(unsigned long rphys)
 	}
 #endif
 
+	proc->mcexec_flags = pn->mcexec_flags;
+	dkprintf("%s: PID: %d, flags: 0x%lx\n",
+		__func__, proc->pid, proc->mcexec_flags);
+
 #ifdef PROFILE_ENABLE
 	proc->profile = pn->profile;
 	thread->profile = pn->profile;
diff --git a/kernel/include/process.h b/kernel/include/process.h
index b5547de6..950a13fa 100644
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@@ -577,6 +577,7 @@ struct process {
 	int enable_tofu;
 #endif
 	size_t straight_map_threshold;
+	unsigned long mcexec_flags;
 
 	// perf_event
 	int perf_status;
diff --git a/kernel/include/syscall.h b/kernel/include/syscall.h
index e54d9306..474aac42 100644
--- a/kernel/include/syscall.h
+++ b/kernel/include/syscall.h
@@ -243,6 +243,7 @@ struct program_load_desc {
 #ifdef ENABLE_TOFU
 	int enable_tofu;
 #endif
+	unsigned long mcexec_flags;
 	int nr_processes;
 	int process_rank;
 	__cpu_set_unit cpu_set[PLD_CPU_SET_SIZE];