diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index df50537d70..77c1f568af 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -114,6 +114,11 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize|0x0|UINT32|0x1a
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd|0x0|UINT32|0x1f
 
+  ## The IO port aperture shared by all PCI root bridges.
+  #
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase|0xC000|UINT64|0x22
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize|0x4000|UINT64|0x23
+
 [PcdsDynamic, PcdsDynamicEx]
   gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 6735b50d70..1df0f383bc 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -201,8 +201,8 @@ MemMapInitialization (
     EFI_RESOURCE_IO,
     EFI_RESOURCE_ATTRIBUTE_PRESENT     |
     EFI_RESOURCE_ATTRIBUTE_INITIALIZED,
-    0xC000,
-    0x4000
+    PcdGet64 (PcdPciIoBase),
+    PcdGet64 (PcdPciIoSize)
     );
 
   //
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
index 11b3865292..22250c061c 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -75,6 +75,8 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize
   gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes
   gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdS3AcpiReservedMemorySize