MdeModulePkg/FaultTolerantWrite: Update to consume SpeculationBarrier

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1417

Since BaseLib API AsmLfence() is a x86 arch specific API and should be
avoided using in generic codes, this commit replaces the usage of
AsmLfence() with arch-generic API SpeculationBarrier().

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
index 27fcab19b6..481fea3f1f 100644
--- a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
+++ b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c
@@ -419,11 +419,11 @@ SmmFaultTolerantWriteHandler (
                  );

       if (!EFI_ERROR (Status)) {

         //

-        // The AsmLfence() call here is to ensure the previous range/content

-        // checks for the CommBuffer have been completed before calling into

-        // FtwWrite().

+        // The SpeculationBarrier() call here is to ensure the previous

+        // range/content checks for the CommBuffer have been completed before

+        // calling into FtwWrite().

         //

-        AsmLfence ();

+        SpeculationBarrier ();

         Status = FtwWrite(

                    &mFtwDevice->FtwInstance,

                    SmmFtwWriteHeader->Lba,