diff --git a/crypto/Kconfig b/crypto/Kconfig
index 86960aa53e0f..bbab6bf33519 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -168,6 +168,16 @@ config CRYPTO_MANAGER_DISABLE_TESTS
 	  Disable run-time self tests that normally take place at
 	  algorithm registration.
 
+config CRYPTO_MANAGER_EXTRA_TESTS
+	bool "Enable extra run-time crypto self tests"
+	depends on DEBUG_KERNEL && !CRYPTO_MANAGER_DISABLE_TESTS
+	help
+	  Enable extra run-time self tests of registered crypto algorithms,
+	  including randomized fuzz tests.
+
+	  This is intended for developer use only, as these tests take much
+	  longer to run than the normal self tests.
+
 config CRYPTO_GF128MUL
 	tristate "GF(2^128) multiplication functions"
 	help
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 0fc9421ddaba..99f84160cb1d 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -43,6 +43,16 @@ static bool notests;
 module_param(notests, bool, 0644);
 MODULE_PARM_DESC(notests, "disable crypto self-tests");
 
+#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
+static bool noextratests;
+module_param(noextratests, bool, 0644);
+MODULE_PARM_DESC(noextratests, "disable expensive crypto self-tests");
+
+static unsigned int fuzz_iterations = 100;
+module_param(fuzz_iterations, uint, 0644);
+MODULE_PARM_DESC(fuzz_iterations, "number of fuzz test iterations");
+#endif
+
 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
 
 /* a perfect nop */
@@ -4103,6 +4113,10 @@ static void testmgr_onetime_init(void)
 {
 	alg_check_test_descs_order();
 	alg_check_testvec_configs();
+
+#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
+	pr_warn("alg: extra crypto tests enabled.  This is intended for developer use only.\n");
+#endif
 }
 
 static int alg_find_test(const char *alg)