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diff --git a/src/VBox/Main/src-server/GraphicsAdapterImpl.cpp b/src/VBox/Main/src-server/GraphicsAdapterImpl.cpp
new file mode 100644
index 00000000..7ebe01cc
--- /dev/null
+++ b/src/VBox/Main/src-server/GraphicsAdapterImpl.cpp
@@ -0,0 +1,445 @@
+/* $Id: GraphicsAdapterImpl.cpp $ */
+/** @file
+ * Implementation of IGraphicsAdapter in VBoxSVC.
+ */
+
+/*
+ * Copyright (C) 2004-2022 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
+ */
+
+#define LOG_GROUP LOG_GROUP_MAIN_GRAPHICSADAPTER
+
+#include "LoggingNew.h"
+
+#include "GraphicsAdapterImpl.h"
+#include "MachineImpl.h"
+
+#include "AutoStateDep.h"
+#include "AutoCaller.h"
+
+#include <iprt/cpp/utils.h>
+
+
+// constructor / destructor
+/////////////////////////////////////////////////////////////////////////////
+
+GraphicsAdapter::GraphicsAdapter() :
+    mParent(NULL)
+{}
+
+GraphicsAdapter::~GraphicsAdapter()
+{}
+
+HRESULT GraphicsAdapter::FinalConstruct()
+{
+    LogFlowThisFunc(("\n"));
+    return BaseFinalConstruct();
+}
+
+void GraphicsAdapter::FinalRelease()
+{
+    LogFlowThisFunc(("\n"));
+    uninit();
+    BaseFinalRelease();
+}
+
+// public initializer/uninitializer for internal purposes only
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+ *  Initializes the graphics adapter object.
+ *
+ *  @param aParent  Handle of the parent object.
+ */
+HRESULT GraphicsAdapter::init(Machine *aParent)
+{
+    LogFlowThisFunc(("aParent=%p\n", aParent));
+
+    ComAssertRet(aParent, E_INVALIDARG);
+
+    /* Enclose the state transition NotReady->InInit->Ready */
+    AutoInitSpan autoInitSpan(this);
+    AssertReturn(autoInitSpan.isOk(), E_FAIL);
+
+    unconst(mParent) = aParent;
+    /* mPeer is left null */
+
+    mData.allocate();
+
+    /* Confirm a successful initialization */
+    autoInitSpan.setSucceeded();
+
+    return S_OK;
+}
+
+/**
+ *  Initializes the graphics adapter object given another graphics adapter
+ *  object (a kind of copy constructor). This object shares data with
+ *  the object passed as an argument.
+ *
+ *  @note This object must be destroyed before the original object
+ *  it shares data with is destroyed.
+ *
+ *  @note Locks @a aThat object for reading.
+ */
+HRESULT GraphicsAdapter::init(Machine *aParent, GraphicsAdapter *aThat)
+{
+    LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));
+
+    ComAssertRet(aParent && aThat, E_INVALIDARG);
+
+    /* Enclose the state transition NotReady->InInit->Ready */
+    AutoInitSpan autoInitSpan(this);
+    AssertReturn(autoInitSpan.isOk(), E_FAIL);
+
+    unconst(mParent) = aParent;
+    unconst(mPeer) = aThat;
+
+    AutoCaller thatCaller(aThat);
+    AssertComRCReturnRC(thatCaller.rc());
+
+    AutoReadLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
+    mData.share(aThat->mData);
+
+    /* Confirm a successful initialization */
+    autoInitSpan.setSucceeded();
+
+    return S_OK;
+}
+
+/**
+ *  Initializes the graphics adapter object given another graphics adapter
+ *  object (a kind of copy constructor). This object makes a private copy
+ *  of data of the original object passed as an argument.
+ *
+ *  @note Locks @a aThat object for reading.
+ */
+HRESULT GraphicsAdapter::initCopy(Machine *aParent, GraphicsAdapter *aThat)
+{
+    LogFlowThisFunc(("aParent=%p, aThat=%p\n", aParent, aThat));
+
+    ComAssertRet(aParent && aThat, E_INVALIDARG);
+
+    /* Enclose the state transition NotReady->InInit->Ready */
+    AutoInitSpan autoInitSpan(this);
+    AssertReturn(autoInitSpan.isOk(), E_FAIL);
+
+    unconst(mParent) = aParent;
+    /* mPeer is left null */
+
+    AutoCaller thatCaller(aThat);
+    AssertComRCReturnRC(thatCaller.rc());
+
+    AutoReadLock thatLock(aThat COMMA_LOCKVAL_SRC_POS);
+    mData.attachCopy(aThat->mData);
+
+    /* Confirm a successful initialization */
+    autoInitSpan.setSucceeded();
+
+    return S_OK;
+}
+
+/**
+ *  Uninitializes the instance and sets the ready flag to FALSE.
+ *  Called either from FinalRelease() or by the parent when it gets destroyed.
+ */
+void GraphicsAdapter::uninit()
+{
+    LogFlowThisFunc(("\n"));
+
+    /* Enclose the state transition Ready->InUninit->NotReady */
+    AutoUninitSpan autoUninitSpan(this);
+    if (autoUninitSpan.uninitDone())
+        return;
+
+    mData.free();
+
+    unconst(mPeer) = NULL;
+    unconst(mParent) = NULL;
+}
+
+// Wrapped IGraphicsAdapter properties
+/////////////////////////////////////////////////////////////////////////////
+
+HRESULT GraphicsAdapter::getGraphicsControllerType(GraphicsControllerType_T *aGraphicsControllerType)
+{
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    *aGraphicsControllerType = mData->graphicsControllerType;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::setGraphicsControllerType(GraphicsControllerType_T aGraphicsControllerType)
+{
+    switch (aGraphicsControllerType)
+    {
+        case GraphicsControllerType_Null:
+        case GraphicsControllerType_VBoxVGA:
+#ifdef VBOX_WITH_VMSVGA
+        case GraphicsControllerType_VMSVGA:
+        case GraphicsControllerType_VBoxSVGA:
+#endif
+            break;
+        default:
+            return setError(E_INVALIDARG, tr("The graphics controller type (%d) is invalid"), aGraphicsControllerType);
+    }
+
+    /* the machine needs to be mutable */
+    AutoMutableStateDependency adep(mParent);
+    if (FAILED(adep.rc())) return adep.rc();
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    mParent->i_setModified(Machine::IsModified_GraphicsAdapter);
+    mData.backup();
+    mData->graphicsControllerType = aGraphicsControllerType;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::getVRAMSize(ULONG *aVRAMSize)
+{
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    *aVRAMSize = mData->ulVRAMSizeMB;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::setVRAMSize(ULONG aVRAMSize)
+{
+    /* check VRAM limits */
+    if (aVRAMSize > SchemaDefs::MaxGuestVRAM)
+        return setError(E_INVALIDARG,
+                        tr("Invalid VRAM size: %lu MB (must be in range [%lu, %lu] MB)"),
+                        aVRAMSize, SchemaDefs::MinGuestVRAM, SchemaDefs::MaxGuestVRAM);
+
+    /* the machine needs to be mutable */
+    AutoMutableStateDependency adep(mParent);
+    if (FAILED(adep.rc())) return adep.rc();
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    mParent->i_setModified(Machine::IsModified_GraphicsAdapter);
+    mData.backup();
+    mData->ulVRAMSizeMB = aVRAMSize;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::getAccelerate3DEnabled(BOOL *aAccelerate3DEnabled)
+{
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    *aAccelerate3DEnabled = mData->fAccelerate3D;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::setAccelerate3DEnabled(BOOL aAccelerate3DEnabled)
+{
+    /* the machine needs to be mutable */
+    AutoMutableStateDependency adep(mParent);
+    if (FAILED(adep.rc())) return adep.rc();
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    /** @todo check validity! */
+
+    mParent->i_setModified(Machine::IsModified_GraphicsAdapter);
+    mData.backup();
+    mData->fAccelerate3D = !!aAccelerate3DEnabled;
+
+    return S_OK;
+}
+
+
+HRESULT GraphicsAdapter::getAccelerate2DVideoEnabled(BOOL *aAccelerate2DVideoEnabled)
+{
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    /* bugref:9691 The legacy VHWA acceleration has been disabled completely. */
+    *aAccelerate2DVideoEnabled = FALSE;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::setAccelerate2DVideoEnabled(BOOL aAccelerate2DVideoEnabled)
+{
+    /* the machine needs to be mutable */
+    AutoMutableStateDependency adep(mParent);
+    if (FAILED(adep.rc())) return adep.rc();
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    /** @todo check validity! */
+
+    mParent->i_setModified(Machine::IsModified_GraphicsAdapter);
+    mData.backup();
+    mData->fAccelerate2DVideo = !!aAccelerate2DVideoEnabled;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::getMonitorCount(ULONG *aMonitorCount)
+{
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    *aMonitorCount = mData->cMonitors;
+
+    return S_OK;
+}
+
+HRESULT GraphicsAdapter::setMonitorCount(ULONG aMonitorCount)
+{
+    /* make sure monitor count is a sensible number */
+    if (aMonitorCount < 1 || aMonitorCount > SchemaDefs::MaxGuestMonitors)
+        return setError(E_INVALIDARG,
+                        tr("Invalid monitor count: %lu (must be in range [%lu, %lu])"),
+                        aMonitorCount, 1, SchemaDefs::MaxGuestMonitors);
+
+    /* the machine needs to be mutable */
+    AutoMutableStateDependency adep(mParent);
+    if (FAILED(adep.rc())) return adep.rc();
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    mParent->i_setModified(Machine::IsModified_GraphicsAdapter);
+    mData.backup();
+    mData->cMonitors = aMonitorCount;
+
+    return S_OK;
+}
+
+// Wrapped IGraphicsAdapter methods
+/////////////////////////////////////////////////////////////////////////////
+
+// public methods only for internal purposes
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+ *  Loads settings from the given machine node.
+ *  May be called once right after this object creation.
+ *
+ *  @param data Configuration settings.
+ *
+ *  @note Locks this object for writing.
+ */
+HRESULT GraphicsAdapter::i_loadSettings(const settings::GraphicsAdapter &data)
+{
+    AutoCaller autoCaller(this);
+    AssertComRCReturnRC(autoCaller.rc());
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    mData.assignCopy(&data);
+
+    return S_OK;
+}
+
+/**
+ *  Saves settings to the given machine node.
+ *
+ *  @param data Configuration settings.
+ *
+ *  @note Locks this object for reading.
+ */
+HRESULT GraphicsAdapter::i_saveSettings(settings::GraphicsAdapter &data)
+{
+    AutoCaller autoCaller(this);
+    AssertComRCReturnRC(autoCaller.rc());
+
+    AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    data = *mData.data();
+
+    return S_OK;
+}
+
+/**
+ *  @note Locks this object for writing.
+ */
+void GraphicsAdapter::i_rollback()
+{
+    /* sanity */
+    AutoCaller autoCaller(this);
+    AssertComRCReturnVoid(autoCaller.rc());
+
+    AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
+
+    mData.rollback();
+}
+
+/**
+ *  @note Locks this object for writing, together with the peer object (also
+ *  for writing) if there is one.
+ */
+void GraphicsAdapter::i_commit()
+{
+    /* sanity */
+    AutoCaller autoCaller(this);
+    AssertComRCReturnVoid(autoCaller.rc());
+
+    /* sanity too */
+    AutoCaller peerCaller(mPeer);
+    AssertComRCReturnVoid(peerCaller.rc());
+
+    /* lock both for writing since we modify both (mPeer is "master" so locked
+     * first) */
+    AutoMultiWriteLock2 alock(mPeer, this COMMA_LOCKVAL_SRC_POS);
+
+    if (mData.isBackedUp())
+    {
+        mData.commit();
+        if (mPeer)
+        {
+            /* attach new data to the peer and reshare it */
+            mPeer->mData.attach(mData);
+        }
+    }
+}
+
+/**
+ *  @note Locks this object for writing, together with the peer object
+ *  represented by @a aThat (locked for reading).
+ */
+void GraphicsAdapter::i_copyFrom(GraphicsAdapter *aThat)
+{
+    AssertReturnVoid(aThat != NULL);
+
+    /* sanity */
+    AutoCaller autoCaller(this);
+    AssertComRCReturnVoid(autoCaller.rc());
+
+    /* sanity too */
+    AutoCaller thatCaller(aThat);
+    AssertComRCReturnVoid(thatCaller.rc());
+
+    /* peer is not modified, lock it for reading (aThat is "master" so locked
+     * first) */
+    AutoReadLock rl(aThat COMMA_LOCKVAL_SRC_POS);
+    AutoWriteLock wl(this COMMA_LOCKVAL_SRC_POS);
+
+    /* this will back up current data */
+    mData.assignCopy(aThat->mData);
+}
+/* vi: set tabstop=4 shiftwidth=4 expandtab: */