3 files changed, 23 insertions, 3 deletions
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 78a8e0de34..886d236226 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -42,6 +42,17 @@ UINT8 mPhysMemAddressWidth;
 STATIC UINT32 mS3AcpiReservedMemoryBase;
 STATIC UINT32 mS3AcpiReservedMemorySize;
 
+STATIC UINT16 mQ35TsegMbytes;
+
+VOID
+Q35TsegMbytesInitialization (
+  VOID
+  )
+{
+  mQ35TsegMbytes = PcdGet16 (PcdQ35TsegMbytes);
+}
+
+
 UINT32
 GetSystemMemorySizeBelow4gb (
   VOID
@@ -348,7 +359,7 @@ PublishPeiMemory (
     //
     // TSEG is chipped from the end of low RAM
     //
-    LowerMemorySize -= FixedPcdGet16 (PcdQ35TsegMbytes) * SIZE_1MB;
+    LowerMemorySize -= mQ35TsegMbytes * SIZE_1MB;
   }
 
   //
@@ -456,7 +467,7 @@ QemuInitializeRam (
     if (FeaturePcdGet (PcdSmmSmramRequire)) {
       UINT32 TsegSize;
 
-      TsegSize = FixedPcdGet16 (PcdQ35TsegMbytes) * SIZE_1MB;
+      TsegSize = mQ35TsegMbytes * SIZE_1MB;
       AddMemoryRangeHob (BASE_1MB, LowerMemorySize - TsegSize);
       AddReservedMemoryBaseSizeHob (LowerMemorySize - TsegSize, TsegSize,
         TRUE);
@@ -605,7 +616,7 @@ InitializeRamRegions (
       // Make sure the TSEG area that we reported as a reserved memory resource
       // cannot be used for reserved memory allocations.
       //
-      TsegSize = FixedPcdGet16 (PcdQ35TsegMbytes) * SIZE_1MB;
+      TsegSize = mQ35TsegMbytes * SIZE_1MB;
       BuildMemoryAllocationHob (
         GetSystemMemorySizeBelow4gb() - TsegSize,
         TsegSize,
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 3e9fda7c7a..b8a28450d6 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -645,6 +645,10 @@ InitializePlatform (
   AddressWidthInitialization ();
   MaxCpuCountInitialization ();
 
+  if (FeaturePcdGet (PcdSmmSmramRequire)) {
+    Q35TsegMbytesInitialization ();
+  }
+
   PublishPeiMemory ();
 
   InitializeRamRegions ();
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index 18f42c3f0e..d2d627b221 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -53,6 +53,11 @@ AddressWidthInitialization (
   VOID
   );
 
+VOID
+Q35TsegMbytesInitialization (
+  VOID
+  );
+
 EFI_STATUS
 PublishPeiMemory (
   VOID