diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index a6d961673d..0b11275157 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -88,7 +88,8 @@ AddIoMemoryBaseSizeHob (
 VOID
 AddReservedMemoryBaseSizeHob (
   EFI_PHYSICAL_ADDRESS        MemoryBase,
-  UINT64                      MemorySize
+  UINT64                      MemorySize,
+  BOOLEAN                     Cacheable
   )
 {
   BuildResourceDescriptorHob (
@@ -96,6 +97,12 @@ AddReservedMemoryBaseSizeHob (
       EFI_RESOURCE_ATTRIBUTE_PRESENT     |
       EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
       EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
+      (Cacheable ?
+       EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
+       EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
+       EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE :
+       0
+       ) |
       EFI_RESOURCE_ATTRIBUTE_TESTED,
     MemoryBase,
     MemorySize
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index 8b6a9760eb..dad3c61e26 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -50,7 +50,8 @@ AddUntestedMemoryBaseSizeHob (
 VOID
 AddReservedMemoryBaseSizeHob (
   EFI_PHYSICAL_ADDRESS        MemoryBase,
-  UINT64                      MemorySize
+  UINT64                      MemorySize,
+  BOOLEAN                     Cacheable
   );
 
 VOID
diff --git a/OvmfPkg/PlatformPei/Xen.c b/OvmfPkg/PlatformPei/Xen.c
index 1886326f20..7fa9019f1a 100644
--- a/OvmfPkg/PlatformPei/Xen.c
+++ b/OvmfPkg/PlatformPei/Xen.c
@@ -223,7 +223,7 @@ InitializeXen (
   // Reserve away HVMLOADER reserved memory [0xFC000000,0xFD000000).
   // This needs to match HVMLOADER RESERVED_MEMBASE/RESERVED_MEMSIZE.
   //
-  AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000);
+  AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000, FALSE);
 
   PcdSetBool (PcdPciDisableBusEnumeration, TRUE);