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diff --git a/OvmfPkg/Library/BasePciCapLib/BasePciCapLib.h b/OvmfPkg/Library/BasePciCapLib/BasePciCapLib.h
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+++ b/OvmfPkg/Library/BasePciCapLib/BasePciCapLib.h
@@ -0,0 +1,60 @@
+/** @file
+  Work with PCI capabilities in PCI config space -- internal type definitions.
+
+  Copyright (C) 2018, Red Hat, Inc.
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
+  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#ifndef __BASE_PCI_CAP_LIB_H__
+#define __BASE_PCI_CAP_LIB_H__
+
+#include <Library/OrderedCollectionLib.h>
+
+#include <Library/PciCapLib.h>
+
+//
+// Structure that uniquely identifies a capability instance and serves as key
+// for insertion and lookup.
+//
+typedef struct {
+  PCI_CAP_DOMAIN Domain;
+  UINT16         CapId;
+  UINT16         Instance;
+} PCI_CAP_KEY;
+
+//
+// In Instance==0 PCI_CAP objects, store NumInstances directly. In Instance>0
+// PCI_CAP objects, link Instance#0 of the same (Domain, CapId). This way
+// NumInstances needs maintenance in one object only, per (Domain, CapId) pair.
+//
+typedef union {
+  UINT16  NumInstances;
+  PCI_CAP *InstanceZero;
+} PCI_CAP_NUM_INSTANCES;
+
+//
+// Complete the incomplete PCI_CAP structure here.
+//
+struct PCI_CAP {
+  PCI_CAP_KEY           Key;
+  PCI_CAP_NUM_INSTANCES NumInstancesUnion;
+  UINT16                Offset;
+  UINT16                MaxSizeHint;
+  UINT8                 Version;
+};
+
+//
+// Complete the incomplete PCI_CAP_LIST structure here.
+//
+struct PCI_CAP_LIST {
+  ORDERED_COLLECTION *Capabilities;
+};
+
+#endif // __BASE_PCI_CAP_LIB_H__