1 files changed, 26 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Variable/RuntimeDxe/SpeculationBarrierSmm.c b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Variable/RuntimeDxe/SpeculationBarrierSmm.c
new file mode 100644
index 00000000..fbbfdc8d
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Variable/RuntimeDxe/SpeculationBarrierSmm.c
@@ -0,0 +1,26 @@
+/** @file
+  Barrier to stop speculative execution (SMM version).
+
+Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include "Variable.h"
+
+/**
+  This service is consumed by the variable modules to place a barrier to stop
+  speculative execution.
+
+  Ensures that no later instruction will execute speculatively, until all prior
+  instructions have completed.
+
+**/
+VOID
+VariableSpeculationBarrier (
+  VOID
+  )
+{
+  SpeculationBarrier ();
+}