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diff --git a/include/VBox/vmm/pdmthread.h b/include/VBox/vmm/pdmthread.h
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+/** @file
+ * PDM - Pluggable Device Manager, Threads.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_vmm_pdmthread_h
+#define VBOX_INCLUDED_vmm_pdmthread_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/cdefs.h>
+#include <VBox/types.h>
+#ifdef IN_RING3
+# include <iprt/thread.h>
+#endif
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_pdm_thread The PDM Threads API
+ * @ingroup grp_pdm
+ * @{
+ */
+
+/**
+ * The thread state
+ */
+typedef enum PDMTHREADSTATE
+{
+ /** The usual invalid 0 entry. */
+ PDMTHREADSTATE_INVALID = 0,
+ /** The thread is initializing.
+ * Prev state: none
+ * Next state: suspended, terminating (error) */
+ PDMTHREADSTATE_INITIALIZING,
+ /** The thread has been asked to suspend.
+ * Prev state: running
+ * Next state: suspended */
+ PDMTHREADSTATE_SUSPENDING,
+ /** The thread is supended.
+ * Prev state: suspending, initializing
+ * Next state: resuming, terminated. */
+ PDMTHREADSTATE_SUSPENDED,
+ /** The thread is active.
+ * Prev state: suspended
+ * Next state: running, terminating. */
+ PDMTHREADSTATE_RESUMING,
+ /** The thread is active.
+ * Prev state: resuming
+ * Next state: suspending, terminating. */
+ PDMTHREADSTATE_RUNNING,
+ /** The thread has been asked to terminate.
+ * Prev state: initializing, suspended, resuming, running
+ * Next state: terminated. */
+ PDMTHREADSTATE_TERMINATING,
+ /** The thread is terminating / has terminated.
+ * Prev state: terminating
+ * Next state: none */
+ PDMTHREADSTATE_TERMINATED,
+ /** The usual 32-bit hack. */
+ PDMTHREADSTATE_32BIT_HACK = 0x7fffffff
+} PDMTHREADSTATE;
+
+/** A pointer to a PDM thread. */
+typedef R3PTRTYPE(struct PDMTHREAD *) PPDMTHREAD;
+/** A pointer to a pointer to a PDM thread. */
+typedef PPDMTHREAD *PPPDMTHREAD;
+
+/**
+ * PDM thread, device variation.
+ *
+ * @returns VBox status code.
+ * @param pDevIns The device instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADDEV,(PPDMDEVINS pDevIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADDEV(). */
+typedef FNPDMTHREADDEV *PFNPDMTHREADDEV;
+
+/**
+ * PDM thread, USB device variation.
+ *
+ * @returns VBox status code.
+ * @param pUsbIns The USB device instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADUSB,(PPDMUSBINS pUsbIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADUSB(). */
+typedef FNPDMTHREADUSB *PFNPDMTHREADUSB;
+
+/**
+ * PDM thread, driver variation.
+ *
+ * @returns VBox status code.
+ * @param pDrvIns The driver instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADDRV,(PPDMDRVINS pDrvIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADDRV(). */
+typedef FNPDMTHREADDRV *PFNPDMTHREADDRV;
+
+/**
+ * PDM thread, driver variation.
+ *
+ * @returns VBox status code.
+ * @param pVM The cross context VM structure.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADINT,(PVM pVM, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADINT(). */
+typedef FNPDMTHREADINT *PFNPDMTHREADINT;
+
+/**
+ * PDM thread, driver variation.
+ *
+ * @returns VBox status code.
+ * @param pThread The PDM thread data.
+ */
+typedef int FNPDMTHREADEXT(PPDMTHREAD pThread);
+/** Pointer to a FNPDMTHREADEXT(). */
+typedef FNPDMTHREADEXT *PFNPDMTHREADEXT;
+
+
+
+/**
+ * PDM thread wakeup call, device variation.
+ *
+ * @returns VBox status code.
+ * @param pDevIns The device instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADWAKEUPDEV,(PPDMDEVINS pDevIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADDEV(). */
+typedef FNPDMTHREADWAKEUPDEV *PFNPDMTHREADWAKEUPDEV;
+
+/**
+ * PDM thread wakeup call, device variation.
+ *
+ * @returns VBox status code.
+ * @param pUsbIns The USB device instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADWAKEUPUSB,(PPDMUSBINS pUsbIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADUSB(). */
+typedef FNPDMTHREADWAKEUPUSB *PFNPDMTHREADWAKEUPUSB;
+
+/**
+ * PDM thread wakeup call, driver variation.
+ *
+ * @returns VBox status code.
+ * @param pDrvIns The driver instance.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADWAKEUPDRV,(PPDMDRVINS pDrvIns, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADDRV(). */
+typedef FNPDMTHREADWAKEUPDRV *PFNPDMTHREADWAKEUPDRV;
+
+/**
+ * PDM thread wakeup call, internal variation.
+ *
+ * @returns VBox status code.
+ * @param pVM The cross context VM structure.
+ * @param pThread The PDM thread data.
+ */
+typedef DECLCALLBACKTYPE(int, FNPDMTHREADWAKEUPINT,(PVM pVM, PPDMTHREAD pThread));
+/** Pointer to a FNPDMTHREADWAKEUPINT(). */
+typedef FNPDMTHREADWAKEUPINT *PFNPDMTHREADWAKEUPINT;
+
+/**
+ * PDM thread wakeup call, external variation.
+ *
+ * @returns VBox status code.
+ * @param pThread The PDM thread data.
+ */
+typedef int FNPDMTHREADWAKEUPEXT(PPDMTHREAD pThread);
+/** Pointer to a FNPDMTHREADEXT(). */
+typedef FNPDMTHREADWAKEUPEXT *PFNPDMTHREADWAKEUPEXT;
+
+
+/**
+ * PDM Thread instance data.
+ */
+typedef struct PDMTHREAD
+{
+ /** PDMTHREAD_VERSION. */
+ uint32_t u32Version;
+ /** The thread state. */
+ PDMTHREADSTATE volatile enmState;
+ /** The thread handle. */
+ RTTHREAD Thread;
+ /** The user parameter. */
+ R3PTRTYPE(void *) pvUser;
+ /** Data specific to the kind of thread.
+ * This should really be in PDMTHREADINT, but is placed here because of the
+ * function pointer typedefs. So, don't touch these, please.
+ */
+ union
+ {
+ /** PDMTHREADTYPE_DEVICE data. */
+ struct
+ {
+ /** The device instance. */
+ PPDMDEVINSR3 pDevIns;
+ /** The thread function. */
+ R3PTRTYPE(PFNPDMTHREADDEV) pfnThread;
+ /** Thread. */
+ R3PTRTYPE(PFNPDMTHREADWAKEUPDEV) pfnWakeUp;
+ } Dev;
+
+ /** PDMTHREADTYPE_USB data. */
+ struct
+ {
+ /** The device instance. */
+ PPDMUSBINS pUsbIns;
+ /** The thread function. */
+ R3PTRTYPE(PFNPDMTHREADUSB) pfnThread;
+ /** Thread. */
+ R3PTRTYPE(PFNPDMTHREADWAKEUPUSB) pfnWakeUp;
+ } Usb;
+
+ /** PDMTHREADTYPE_DRIVER data. */
+ struct
+ {
+ /** The driver instance. */
+ R3PTRTYPE(PPDMDRVINS) pDrvIns;
+ /** The thread function. */
+ R3PTRTYPE(PFNPDMTHREADDRV) pfnThread;
+ /** Thread. */
+ R3PTRTYPE(PFNPDMTHREADWAKEUPDRV) pfnWakeUp;
+ } Drv;
+
+ /** PDMTHREADTYPE_INTERNAL data. */
+ struct
+ {
+ /** The thread function. */
+ R3PTRTYPE(PFNPDMTHREADINT) pfnThread;
+ /** Thread. */
+ R3PTRTYPE(PFNPDMTHREADWAKEUPINT) pfnWakeUp;
+ } Int;
+
+ /** PDMTHREADTYPE_EXTERNAL data. */
+ struct
+ {
+ /** The thread function. */
+ R3PTRTYPE(PFNPDMTHREADEXT) pfnThread;
+ /** Thread. */
+ R3PTRTYPE(PFNPDMTHREADWAKEUPEXT) pfnWakeUp;
+ } Ext;
+ } u;
+
+ /** Internal data. */
+ union
+ {
+#ifdef PDMTHREADINT_DECLARED
+ PDMTHREADINT s;
+#endif
+ uint8_t padding[64];
+ } Internal;
+} PDMTHREAD;
+
+/** PDMTHREAD::u32Version value. */
+#define PDMTHREAD_VERSION PDM_VERSION_MAKE(0xefff, 1, 0)
+
+#ifdef IN_RING3
+VMMR3DECL(int) PDMR3ThreadCreate(PVM pVM, PPPDMTHREAD ppThread, void *pvUser, PFNPDMTHREADINT pfnThread,
+ PFNPDMTHREADWAKEUPINT pfnWakeUp, size_t cbStack, RTTHREADTYPE enmType, const char *pszName);
+VMMR3DECL(int) PDMR3ThreadCreateExternal(PVM pVM, PPPDMTHREAD ppThread, void *pvUser, PFNPDMTHREADEXT pfnThread,
+ PFNPDMTHREADWAKEUPEXT pfnWakeUp, size_t cbStack, RTTHREADTYPE enmType, const char *pszName);
+VMMR3DECL(int) PDMR3ThreadDestroy(PPDMTHREAD pThread, int *pRcThread);
+VMMR3DECL(int) PDMR3ThreadIAmSuspending(PPDMTHREAD pThread);
+VMMR3DECL(int) PDMR3ThreadIAmRunning(PPDMTHREAD pThread);
+VMMR3DECL(int) PDMR3ThreadSleep(PPDMTHREAD pThread, RTMSINTERVAL cMillies);
+VMMR3DECL(int) PDMR3ThreadSuspend(PPDMTHREAD pThread);
+VMMR3DECL(int) PDMR3ThreadResume(PPDMTHREAD pThread);
+#endif /* IN_RING3 */
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_vmm_pdmthread_h */