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diff --git a/src/VBox/Main/include/BusAssignmentManager.h b/src/VBox/Main/include/BusAssignmentManager.h
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+++ b/src/VBox/Main/include/BusAssignmentManager.h
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+/* $Id: BusAssignmentManager.h $ */
+/** @file
+ * VirtualBox bus slots assignment manager
+ */
+
+/*
+ * Copyright (C) 2010-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_BusAssignmentManager_h
+#define MAIN_INCLUDED_BusAssignmentManager_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "VBox/types.h"
+#include "VBox/pci.h"
+#include "VirtualBoxBase.h"
+#include <vector>
+
+class BusAssignmentManager
+{
+private:
+    struct State;
+    State *pState;
+
+    BusAssignmentManager();
+    virtual ~BusAssignmentManager();
+
+    HRESULT assignPCIDeviceImpl(const char *pszDevName, PCFGMNODE pCfg, PCIBusAddress& GuestAddress,
+                                PCIBusAddress HostAddress, bool fGuestAddressRequired = false);
+
+public:
+    struct PCIDeviceInfo
+    {
+        com::Utf8Str strDeviceName;
+        PCIBusAddress guestAddress;
+        PCIBusAddress hostAddress;
+    };
+
+    static BusAssignmentManager *createInstance(PCVMMR3VTABLE pVMM, ChipsetType_T chipsetType, IommuType_T iommuType);
+    virtual void AddRef();
+    virtual void Release();
+
+    virtual HRESULT assignHostPCIDevice(const char *pszDevName, PCFGMNODE pCfg, PCIBusAddress HostAddress,
+                                        PCIBusAddress& GuestAddress, bool fAddressRequired = false)
+    {
+        return assignPCIDeviceImpl(pszDevName, pCfg, GuestAddress, HostAddress, fAddressRequired);
+    }
+
+    virtual HRESULT assignPCIDevice(const char *pszDevName, PCFGMNODE pCfg, PCIBusAddress& Address, bool fAddressRequired = false)
+    {
+        PCIBusAddress HostAddress;
+        return assignPCIDeviceImpl(pszDevName, pCfg, Address, HostAddress, fAddressRequired);
+    }
+
+    virtual HRESULT assignPCIDevice(const char *pszDevName, PCFGMNODE pCfg)
+    {
+        PCIBusAddress GuestAddress;
+        PCIBusAddress HostAddress;
+        return assignPCIDeviceImpl(pszDevName, pCfg, GuestAddress, HostAddress, false);
+    }
+    virtual bool findPCIAddress(const char *pszDevName, int iInstance, PCIBusAddress& Address);
+    virtual bool hasPCIDevice(const char *pszDevName, int iInstance)
+    {
+        PCIBusAddress Address;
+        return findPCIAddress(pszDevName, iInstance, Address);
+    }
+    virtual void listAttachedPCIDevices(std::vector<PCIDeviceInfo> &aAttached);
+};
+
+#endif /* !MAIN_INCLUDED_BusAssignmentManager_h */