VariableHob may be built in PcdPeim (by PcdNvStoreDefaultValueBuffer)
or some platform module (by some tool).
The two solutions should not be co-exist.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 MdeModulePkg/Universal/Variable/Pei/Variable.c     | 24 ++++++++++++++++++++++
 .../Universal/Variable/RuntimeDxe/Variable.c       | 24 ++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/MdeModulePkg/Universal/Variable/Pei/Variable.c b/MdeModulePkg/Universal/Variable/Pei/Variable.c
index 1bcab3b770a5..d75a13e2b079 100644
--- a/MdeModulePkg/Universal/Variable/Pei/Variable.c
+++ b/MdeModulePkg/Universal/Variable/Pei/Variable.c
@@ -507,6 +507,30 @@ GetHobVariableStore (
 {
   EFI_HOB_GUID_TYPE              *GuidHob;
 
+  //
+  // Make sure there is no more than one Variable HOB.
+  //
+  DEBUG_CODE (
+    GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
+    if (GuidHob != NULL) {
+      if ((GetNextGuidHob (&gEfiAuthenticatedVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
+        DEBUG ((DEBUG_ERROR, "ERROR: Found two Auth Variable HOBs\n"));
+        ASSERT (FALSE);
+      } else if (GetFirstGuidHob (&gEfiVariableGuid) != NULL) {
+        DEBUG ((DEBUG_ERROR, "ERROR: Found one Auth + one Normal Variable HOBs\n"));
+        ASSERT (FALSE);
+      }
+    } else {
+      GuidHob = GetFirstGuidHob (&gEfiVariableGuid);
+      if (GuidHob != NULL) {
+        if ((GetNextGuidHob (&gEfiVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
+          DEBUG ((DEBUG_ERROR, "ERROR: Found two Normal Variable HOBs\n"));
+          ASSERT (FALSE);
+        }
+      }
+    }
+  );
+
   GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
   if (GuidHob != NULL) {
     *VariableStoreHeader = (VARIABLE_STORE_HEADER *) GET_GUID_HOB_DATA (GuidHob);
diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
index fca8d5380924..42b0bfda570d 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
@@ -4190,6 +4190,30 @@ GetHobVariableStore (
   BOOLEAN                       NeedConvertNormalToAuth;
 
   //
+  // Make sure there is no more than one Variable HOB.
+  //
+  DEBUG_CODE (
+    GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
+    if (GuidHob != NULL) {
+      if ((GetNextGuidHob (&gEfiAuthenticatedVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
+        DEBUG ((DEBUG_ERROR, "ERROR: Found two Auth Variable HOBs\n"));
+        ASSERT (FALSE);
+      } else if (GetFirstGuidHob (&gEfiVariableGuid) != NULL) {
+        DEBUG ((DEBUG_ERROR, "ERROR: Found one Auth + one Normal Variable HOBs\n"));
+        ASSERT (FALSE);
+      }
+    } else {
+      GuidHob = GetFirstGuidHob (&gEfiVariableGuid);
+      if (GuidHob != NULL) {
+        if ((GetNextGuidHob (&gEfiVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
+          DEBUG ((DEBUG_ERROR, "ERROR: Found two Normal Variable HOBs\n"));
+          ASSERT (FALSE);
+        }
+      }
+    }
+  );
+
+  //
   // Combinations supported:
   // 1. Normal NV variable store +
   //    Normal HOB variable store
-- 
2.7.0.windows.1

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