Main/include/MachineImpl.h

	MachineImpl.h revision f1fafcf7a20333095aa5a7e236a4deef787efe89
/* $Id$ */
/** @file
 * Implementation of IMachine in VBoxSVC - Header.
 */

/*
 * Copyright (C) 2006-2014 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

#ifndef ____H_MACHINEIMPL
#define ____H_MACHINEIMPL

#include "VirtualBoxBase.h"
#include "SnapshotImpl.h"
#include "ProgressImpl.h"
#include "VRDEServerImpl.h"
#include "MediumAttachmentImpl.h"
#include "PCIDeviceAttachmentImpl.h"
#include "MediumLock.h"
#include "NetworkAdapterImpl.h"
#include "AudioAdapterImpl.h"
#include "SerialPortImpl.h"
#include "ParallelPortImpl.h"
#include "BIOSSettingsImpl.h"
#include "StorageControllerImpl.h"          // required for MachineImpl.h to compile on Windows
#include "USBControllerImpl.h"              // required for MachineImpl.h to compile on Windows
#include "BandwidthControlImpl.h"
#include "BandwidthGroupImpl.h"
#include "VBox/settings.h"
#ifdef VBOX_WITH_RESOURCE_USAGE_API
#include "Performance.h"
#include "PerformanceImpl.h"
#endif /* VBOX_WITH_RESOURCE_USAGE_API */

// generated header
#include "SchemaDefs.h"

#include "VBox/com/ErrorInfo.h"

#include <iprt/file.h>
#include <iprt/thread.h>
#include <iprt/time.h>

#include <list>
#include <vector>

#include "MachineWrap.h"

// defines
////////////////////////////////////////////////////////////////////////////////

// helper declarations
////////////////////////////////////////////////////////////////////////////////

class Progress;
class ProgressProxy;
class Keyboard;
class Mouse;
class Display;
class MachineDebugger;
class USBController;
class USBDeviceFilters;
class Snapshot;
class SharedFolder;
class HostUSBDevice;
class StorageController;

class SessionMachine;

namespace settings
{
    class MachineConfigFile;
    struct Snapshot;
    struct Hardware;
    struct Storage;
    struct StorageController;
    struct MachineRegistryEntry;
}

// Machine class
////////////////////////////////////////////////////////////////////////////////
//
class ATL_NO_VTABLE Machine :
    public MachineWrap
{

public:

    enum StateDependency
    {
        AnyStateDep = 0,
        MutableStateDep,
        MutableOrSavedStateDep,
        OfflineStateDep
    };

    /**
     * Internal machine data.
     *
     * Only one instance of this data exists per every machine -- it is shared
     * by the Machine, SessionMachine and all SnapshotMachine instances
     * associated with the given machine using the util::Shareable template
     * through the mData variable.
     *
     * @note |const| members are persistent during lifetime so can be
     * accessed without locking.
     *
     * @note There is no need to lock anything inside init() or uninit()
     * methods, because they are always serialized (see AutoCaller).
     */
    struct Data
    {
        /**
         * Data structure to hold information about sessions opened for the
         * given machine.
         */
        struct Session
        {
            /** Control of the direct session opened by lockMachine() */
            ComPtr<IInternalSessionControl> mDirectControl;

            typedef std::list<ComPtr<IInternalSessionControl> > RemoteControlList;

            /** list of controls of all opened remote sessions */
            RemoteControlList mRemoteControls;

            /** launchVMProcess() and OnSessionEnd() progress indicator */
            ComObjPtr<ProgressProxy> mProgress;

            /**
             * PID of the session object that must be passed to openSession()
             * to finalize the launchVMProcess() request (i.e., PID of the
             * process created by launchVMProcess())
             */
            RTPROCESS mPID;

            /** Current session state */
            SessionState_T mState;

            /** Session type string (for indirect sessions) */
            Bstr mType;

            /** Session machine object */
            ComObjPtr<SessionMachine> mMachine;

            /** Medium object lock collection. */
            MediumLockListMap mLockedMedia;
        };

        Data();
        ~Data();

        const Guid          mUuid;
        BOOL                mRegistered;

        Utf8Str             m_strConfigFile;
        Utf8Str             m_strConfigFileFull;

        // machine settings XML file
        settings::MachineConfigFile *pMachineConfigFile;
        uint32_t            flModifications;
        bool                m_fAllowStateModification;

        BOOL                mAccessible;
        com::ErrorInfo      mAccessError;

        MachineState_T      mMachineState;
        RTTIMESPEC          mLastStateChange;

        /* Note: These are guarded by VirtualBoxBase::stateLockHandle() */
        uint32_t            mMachineStateDeps;
        RTSEMEVENTMULTI     mMachineStateDepsSem;
        uint32_t            mMachineStateChangePending;

        BOOL                mCurrentStateModified;
        /** Guest properties have been modified and need saving since the
         * machine was started, or there are transient properties which need
         * deleting and the machine is being shut down. */
        BOOL                mGuestPropertiesModified;

        Session             mSession;

        ComObjPtr<Snapshot> mFirstSnapshot;
        ComObjPtr<Snapshot> mCurrentSnapshot;

        // list of files to delete in Delete(); this list is filled by Unregister()
        std::list<Utf8Str>  llFilesToDelete;
    };

    /**
     *  Saved state data.
     *
     *  It's actually only the state file path string, but it needs to be
     *  separate from Data, because Machine and SessionMachine instances
     *  share it, while SnapshotMachine does not.
     *
     *  The data variable is |mSSData|.
     */
    struct SSData
    {
        Utf8Str strStateFilePath;
    };

    /**
     *  User changeable machine data.
     *
     *  This data is common for all machine snapshots, i.e. it is shared
     *  by all SnapshotMachine instances associated with the given machine
     *  using the util::Backupable template through the |mUserData| variable.
     *
     *  SessionMachine instances can alter this data and discard changes.
     *
     *  @note There is no need to lock anything inside init() or uninit()
     *  methods, because they are always serialized (see AutoCaller).
     */
    struct UserData
    {
        settings::MachineUserData s;
        typedef  std::vector<uint8_t> IconBlob;
        IconBlob mIcon;
    };

    /**
     *  Hardware data.
     *
     *  This data is unique for a machine and for every machine snapshot.
     *  Stored using the util::Backupable template in the |mHWData| variable.
     *
     *  SessionMachine instances can alter this data and discard changes.
     */
    struct HWData
    {
        /**
         * Data structure to hold information about a guest property.
         */
        struct GuestProperty {
            /** Property value */
            Utf8Str strValue;
            /** Property timestamp */
            LONG64 mTimestamp;
            /** Property flags */
            ULONG mFlags;
        };

        HWData();
        ~HWData();

        Bstr                mHWVersion;
        Guid                mHardwareUUID;  /**< If Null, use mData.mUuid. */
        ULONG               mMemorySize;
        ULONG               mMemoryBalloonSize;
        BOOL                mPageFusionEnabled;
        GraphicsControllerType_T mGraphicsControllerType;
        ULONG               mVRAMSize;
        ULONG               mVideoCaptureWidth;
        ULONG               mVideoCaptureHeight;
        ULONG               mVideoCaptureRate;
        ULONG               mVideoCaptureFPS;
        Utf8Str             mVideoCaptureFile;
        BOOL                mVideoCaptureEnabled;
        BOOL                maVideoCaptureScreens[SchemaDefs::MaxGuestMonitors];
        ULONG               mMonitorCount;
        BOOL                mHWVirtExEnabled;
        BOOL                mHWVirtExNestedPagingEnabled;
        BOOL                mHWVirtExLargePagesEnabled;
        BOOL                mHWVirtExVPIDEnabled;
        BOOL                mHWVirtExUXEnabled;
        BOOL                mHWVirtExForceEnabled;
        BOOL                mAccelerate2DVideoEnabled;
        BOOL                mPAEEnabled;
        settings::Hardware::LongModeType mLongMode;
        BOOL                mSyntheticCpu;
        BOOL                mTripleFaultReset;
        ULONG               mCPUCount;
        BOOL                mCPUHotPlugEnabled;
        ULONG               mCpuExecutionCap;
        BOOL                mAccelerate3DEnabled;
        BOOL                mHPETEnabled;

        BOOL                mCPUAttached[SchemaDefs::MaxCPUCount];

        settings::CpuIdLeaf mCpuIdStdLeafs[11];
        settings::CpuIdLeaf mCpuIdExtLeafs[11];

        DeviceType_T        mBootOrder[SchemaDefs::MaxBootPosition];

        typedef std::list<ComObjPtr<SharedFolder> > SharedFolderList;
        SharedFolderList    mSharedFolders;

        ClipboardMode_T     mClipboardMode;
        DnDMode_T           mDnDMode;

        typedef std::map<Utf8Str, GuestProperty> GuestPropertyMap;
        GuestPropertyMap    mGuestProperties;
        Utf8Str             mGuestPropertyNotificationPatterns;

        FirmwareType_T      mFirmwareType;
        KeyboardHIDType_T   mKeyboardHIDType;
        PointingHIDType_T   mPointingHIDType;
        ChipsetType_T       mChipsetType;
        ParavirtProvider_T  mParavirtProvider;
        BOOL                mEmulatedUSBCardReaderEnabled;

        BOOL                mIOCacheEnabled;
        ULONG               mIOCacheSize;

        typedef std::list<ComObjPtr<PCIDeviceAttachment> > PCIDeviceAssignmentList;
        PCIDeviceAssignmentList mPCIDeviceAssignments;

        settings::Debugging mDebugging;
        settings::Autostart mAutostart;

        Utf8Str             mDefaultFrontend;
    };

    /**
     *  Hard disk and other media data.
     *
     *  The usage policy is the same as for HWData, but a separate structure
     *  is necessary because hard disk data requires different procedures when
     *  taking or deleting snapshots, etc.
     *
     *  The data variable is |mMediaData|.
     */
    struct MediaData
    {
        MediaData();
        ~MediaData();

        typedef std::list<ComObjPtr<MediumAttachment> > AttachmentList;
        AttachmentList mAttachments;
    };

    DECLARE_EMPTY_CTOR_DTOR(Machine)

    HRESULT FinalConstruct();
    void FinalRelease();

    // public initializer/uninitializer for internal purposes only:

    // initializer for creating a new, empty machine
    HRESULT init(VirtualBox *aParent,
                 const Utf8Str &strConfigFile,
                 const Utf8Str &strName,
                 const StringsList &llGroups,
                 GuestOSType *aOsType,
                 const Guid &aId,
                 bool fForceOverwrite,
                 bool fDirectoryIncludesUUID);

    // initializer for loading existing machine XML (either registered or not)
    HRESULT initFromSettings(VirtualBox *aParent,
                             const Utf8Str &strConfigFile,
                             const Guid *aId);

    // initializer for machine config in memory (OVF import)
    HRESULT init(VirtualBox *aParent,
                 const Utf8Str &strName,
                 const settings::MachineConfigFile &config);

    void uninit();

#ifdef VBOX_WITH_RESOURCE_USAGE_API
    // Needed from VirtualBox, for the delayed metrics cleanup.
    void i_unregisterMetrics(PerformanceCollector *aCollector, Machine *aMachine);
#endif /* VBOX_WITH_RESOURCE_USAGE_API */

protected:
    HRESULT initImpl(VirtualBox *aParent,
                     const Utf8Str &strConfigFile);
    HRESULT initDataAndChildObjects();
    HRESULT i_registeredInit();
    HRESULT i_tryCreateMachineConfigFile(bool fForceOverwrite);
    void uninitDataAndChildObjects();

public:


    // public methods only for internal purposes

    virtual bool i_isSnapshotMachine() const
    {
        return false;
    }

    virtual bool i_isSessionMachine() const
    {
        return false;
    }

    /**
     * Override of the default locking class to be used for validating lock
     * order with the standard member lock handle.
     */
    virtual VBoxLockingClass getLockingClass() const
    {
        return LOCKCLASS_MACHINEOBJECT;
    }

    /// @todo (dmik) add lock and make non-inlined after revising classes
    //  that use it. Note: they should enter Machine lock to keep the returned
    //  information valid!
    bool i_isRegistered() { return !!mData->mRegistered; }

    // unsafe inline public methods for internal purposes only (ensure there is
    // a caller and a read lock before calling them!)

    /**
     * Returns the VirtualBox object this machine belongs to.
     *
     * @note This method doesn't check this object's readiness. Intended to be
     * used by ready Machine children (whose readiness is bound to the parent's
     * one) or after doing addCaller() manually.
     */
    VirtualBox* i_getVirtualBox() const { return mParent; }

    /**
     * Checks if this machine is accessible, without attempting to load the
     * config file.
     *
     * @note This method doesn't check this object's readiness. Intended to be
     * used by ready Machine children (whose readiness is bound to the parent's
     * one) or after doing addCaller() manually.
     */
    bool i_isAccessible() const { return !!mData->mAccessible; }

    /**
     * Returns this machine ID.
     *
     * @note This method doesn't check this object's readiness. Intended to be
     * used by ready Machine children (whose readiness is bound to the parent's
     * one) or after adding a caller manually.
     */
    const Guid& i_getId() const { return mData->mUuid; }

    /**
     * Returns the snapshot ID this machine represents or an empty UUID if this
     * instance is not SnapshotMachine.
     *
     * @note This method doesn't check this object's readiness. Intended to be
     * used by ready Machine children (whose readiness is bound to the parent's
     * one) or after adding a caller manually.
     */
    inline const Guid& i_getSnapshotId() const;

    /**
     * Returns this machine's full settings file path.
     *
     * @note This method doesn't lock this object or check its readiness.
     * Intended to be used only after doing addCaller() manually and locking it
     * for reading.
     */
    const Utf8Str& i_getSettingsFileFull() const { return mData->m_strConfigFileFull; }

    /**
     * Returns this machine name.
     *
     * @note This method doesn't lock this object or check its readiness.
     * Intended to be used only after doing addCaller() manually and locking it
     * for reading.
     */
    const Utf8Str& i_getName() const { return mUserData->s.strName; }

    enum
    {
        IsModified_MachineData          = 0x0001,
        IsModified_Storage              = 0x0002,
        IsModified_NetworkAdapters      = 0x0008,
        IsModified_SerialPorts          = 0x0010,
        IsModified_ParallelPorts        = 0x0020,
        IsModified_VRDEServer           = 0x0040,
        IsModified_AudioAdapter         = 0x0080,
        IsModified_USB                  = 0x0100,
        IsModified_BIOS                 = 0x0200,
        IsModified_SharedFolders        = 0x0400,
        IsModified_Snapshots            = 0x0800,
        IsModified_BandwidthControl     = 0x1000
    };

    /**
     * Returns various information about this machine.
     *
     * @note This method doesn't lock this object or check its readiness.
     * Intended to be used only after doing addCaller() manually and locking it
     * for reading.
     */
    ChipsetType_T i_getChipsetType() const { return mHWData->mChipsetType; }
    ParavirtProvider_T i_getParavirtProvider() const { return mHWData->mParavirtProvider; }

    void i_setModified(uint32_t fl, bool fAllowStateModification = true);
    void i_setModifiedLock(uint32_t fl, bool fAllowStateModification = true);

    bool i_isStateModificationAllowed() const { return mData->m_fAllowStateModification; }
    void i_allowStateModification()           { mData->m_fAllowStateModification = true; }
    void i_disallowStateModification()        { mData->m_fAllowStateModification = false; }

    const StringsList &i_getGroups() const { return mUserData->s.llGroups; }

    // callback handlers
    virtual HRESULT i_onNetworkAdapterChange(INetworkAdapter * /* networkAdapter */, BOOL /* changeAdapter */) { return S_OK; }
    virtual HRESULT i_onNATRedirectRuleChange(ULONG /* slot */, BOOL /* fRemove */ , IN_BSTR /* name */,
                                              NATProtocol_T /* protocol */, IN_BSTR /* host ip */, LONG /* host port */,
                                              IN_BSTR /* guest port */, LONG /* guest port */ ) { return S_OK; }
    virtual HRESULT i_onSerialPortChange(ISerialPort * /* serialPort */) { return S_OK; }
    virtual HRESULT i_onParallelPortChange(IParallelPort * /* parallelPort */) { return S_OK; }
    virtual HRESULT i_onVRDEServerChange(BOOL /* aRestart */) { return S_OK; }
    virtual HRESULT i_onUSBControllerChange() { return S_OK; }
    virtual HRESULT i_onStorageControllerChange() { return S_OK; }
    virtual HRESULT i_onCPUChange(ULONG /* aCPU */, BOOL /* aRemove */) { return S_OK; }
    virtual HRESULT i_onCPUExecutionCapChange(ULONG /* aExecutionCap */) { return S_OK; }
    virtual HRESULT i_onMediumChange(IMediumAttachment * /* mediumAttachment */, BOOL /* force */) { return S_OK; }
    virtual HRESULT i_onSharedFolderChange() { return S_OK; }
    virtual HRESULT i_onClipboardModeChange(ClipboardMode_T /* aClipboardMode */) { return S_OK; }
    virtual HRESULT i_onDnDModeChange(DnDMode_T /* aDnDMode */) { return S_OK; }
    virtual HRESULT i_onBandwidthGroupChange(IBandwidthGroup * /* aBandwidthGroup */) { return S_OK; }
    virtual HRESULT i_onStorageDeviceChange(IMediumAttachment * /* mediumAttachment */, BOOL /* remove */,
                                            BOOL /* silent */) { return S_OK; }
    virtual HRESULT i_onVideoCaptureChange() { return S_OK; }

    HRESULT i_saveRegistryEntry(settings::MachineRegistryEntry &data);

    int i_calculateFullPath(const Utf8Str &strPath, Utf8Str &aResult);
    void i_copyPathRelativeToMachine(const Utf8Str &strSource, Utf8Str &strTarget);

    void i_getLogFolder(Utf8Str &aLogFolder);
    Utf8Str i_queryLogFilename(ULONG idx);
    Utf8Str i_getStartupLogFilename(void);

    void i_composeSavedStateFilename(Utf8Str &strStateFilePath);

    void i_getDefaultVideoCaptureFile(Utf8Str &strFile);

    bool i_isUSBControllerPresent();

    HRESULT i_launchVMProcess(IInternalSessionControl *aControl,
                              const Utf8Str &strType,
                              const Utf8Str &strEnvironment,
                              ProgressProxy *aProgress);

    HRESULT i_getDirectControl(ComPtr<IInternalSessionControl> *directControl)
    {
        HRESULT rc;
        *directControl = mData->mSession.mDirectControl;

        if (!*directControl)
            rc = E_ACCESSDENIED;
        else
            rc = S_OK;

        return rc;
    }

    bool i_isSessionOpen(ComObjPtr<SessionMachine> &aMachine,
                         ComPtr<IInternalSessionControl> *aControl = NULL,
                         bool aAllowClosing = false);
    bool i_isSessionSpawning();

    bool i_isSessionOpenOrClosing(ComObjPtr<SessionMachine> &aMachine,
                                  ComPtr<IInternalSessionControl> *aControl = NULL)
    { return i_isSessionOpen(aMachine, aControl, true /* aAllowClosing */); }

    bool i_checkForSpawnFailure();

    HRESULT i_prepareRegister();

    HRESULT i_getSharedFolder(CBSTR aName,
                              ComObjPtr<SharedFolder> &aSharedFolder,
                              bool aSetError = false)
    {
        AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
        return i_findSharedFolder(aName, aSharedFolder, aSetError);
    }

    HRESULT i_addStateDependency(StateDependency aDepType = AnyStateDep,
                                 MachineState_T *aState = NULL,
                                 BOOL *aRegistered = NULL);
    void i_releaseStateDependency();

    HRESULT i_getBandwidthGroup(const Utf8Str &strBandwidthGroup,
                                ComObjPtr<BandwidthGroup> &pBandwidthGroup,
                                bool fSetError = false)
    {
        return mBandwidthControl->i_getBandwidthGroupByName(strBandwidthGroup,
                                                            pBandwidthGroup,
                                                            fSetError);
    }


protected:

    class ClientToken;

    HRESULT i_checkStateDependency(StateDependency aDepType);

    Machine *i_getMachine();

    void i_ensureNoStateDependencies();

    virtual HRESULT i_setMachineState(MachineState_T aMachineState);

    HRESULT i_findSharedFolder(const Utf8Str &aName,
                               ComObjPtr<SharedFolder> &aSharedFolder,
                               bool aSetError = false);

    HRESULT i_loadSettings(bool aRegistered);
    HRESULT i_loadMachineDataFromSettings(const settings::MachineConfigFile &config,
                                          const Guid *puuidRegistry);
    HRESULT i_loadSnapshot(const settings::Snapshot &data,
                           const Guid &aCurSnapshotId,
                           Snapshot *aParentSnapshot);
    HRESULT i_loadHardware(const settings::Hardware &data, const settings::Debugging *pDbg,
                           const settings::Autostart *pAutostart);
    HRESULT i_loadDebugging(const settings::Debugging *pDbg);
    HRESULT i_loadAutostart(const settings::Autostart *pAutostart);
    HRESULT i_loadStorageControllers(const settings::Storage &data,
                                     const Guid *puuidRegistry,
                                     const Guid *puuidSnapshot);
    HRESULT i_loadStorageDevices(StorageController *aStorageController,
                                 const settings::StorageController &data,
                                 const Guid *puuidRegistry,
                                 const Guid *puuidSnapshot);

    HRESULT i_findSnapshotById(const Guid &aId,
                               ComObjPtr<Snapshot> &aSnapshot,
                               bool aSetError = false);
    HRESULT i_findSnapshotByName(const Utf8Str &strName,
                                 ComObjPtr<Snapshot> &aSnapshot,
                                 bool aSetError = false);

    HRESULT i_getStorageControllerByName(const Utf8Str &aName,
                                         ComObjPtr<StorageController> &aStorageController,
                                         bool aSetError = false);

    HRESULT i_getMediumAttachmentsOfController(const Utf8Str &aName,
                                               MediaData::AttachmentList &aAttachments);

    HRESULT i_getUSBControllerByName(const Utf8Str &aName,
                                     ComObjPtr<USBController> &aUSBController,
                                     bool aSetError = false);

    ULONG   i_getUSBControllerCountByType(USBControllerType_T enmType);

    enum
    {
        /* flags for #saveSettings() */
        SaveS_ResetCurStateModified = 0x01,
        SaveS_InformCallbacksAnyway = 0x02,
        SaveS_Force = 0x04,
        /* flags for #saveStateSettings() */
        SaveSTS_CurStateModified = 0x20,
        SaveSTS_StateFilePath = 0x40,
        SaveSTS_StateTimeStamp = 0x80
    };

    HRESULT i_prepareSaveSettings(bool *pfNeedsGlobalSaveSettings);
    HRESULT i_saveSettings(bool *pfNeedsGlobalSaveSettings, int aFlags = 0);

    void i_copyMachineDataToSettings(settings::MachineConfigFile &config);
    HRESULT i_saveAllSnapshots(settings::MachineConfigFile &config);
    HRESULT i_saveHardware(settings::Hardware &data, settings::Debugging *pDbg,
                           settings::Autostart *pAutostart);
    HRESULT i_saveStorageControllers(settings::Storage &data);
    HRESULT i_saveStorageDevices(ComObjPtr<StorageController> aStorageController,
                                 settings::StorageController &data);
    HRESULT i_saveStateSettings(int aFlags);

    void i_addMediumToRegistry(ComObjPtr<Medium> &pMedium);

    HRESULT i_createImplicitDiffs(IProgress *aProgress,
                                  ULONG aWeight,
                                  bool aOnline);
    HRESULT i_deleteImplicitDiffs(bool aOnline);

    MediumAttachment* i_findAttachment(const MediaData::AttachmentList &ll,
                                       IN_BSTR aControllerName,
                                       LONG aControllerPort,
                                       LONG aDevice);
    MediumAttachment* i_findAttachment(const MediaData::AttachmentList &ll,
                                       ComObjPtr<Medium> pMedium);
    MediumAttachment* i_findAttachment(const MediaData::AttachmentList &ll,
                                       Guid &id);

    HRESULT i_detachDevice(MediumAttachment *pAttach,
                           AutoWriteLock &writeLock,
                           Snapshot *pSnapshot);

    HRESULT i_detachAllMedia(AutoWriteLock &writeLock,
                             Snapshot *pSnapshot,
                             CleanupMode_T cleanupMode,
                             MediaList &llMedia);

    void i_commitMedia(bool aOnline = false);
    void i_rollbackMedia();

    bool i_isInOwnDir(Utf8Str *aSettingsDir = NULL) const;

    void i_rollback(bool aNotify);
    void i_commit();
    void i_copyFrom(Machine *aThat);
    bool i_isControllerHotplugCapable(StorageControllerType_T enmCtrlType);

    struct DeleteTask;
    static DECLCALLBACK(int) deleteThread(RTTHREAD Thread, void *pvUser);
    HRESULT i_deleteTaskWorker(DeleteTask &task);
    Utf8Str i_getExtraData(const Utf8Str &strKey);

#ifdef VBOX_WITH_GUEST_PROPS
    HRESULT i_getGuestPropertyFromService(const com::Utf8Str &aName, com::Utf8Str &aValue,
                                          LONG64 *aTimestamp, com::Utf8Str &aFlags) const;
    HRESULT i_setGuestPropertyToService(const com::Utf8Str &aName, const com::Utf8Str &aValue,
                                        const com::Utf8Str &aFlags);
    HRESULT i_getGuestPropertyFromVM(const com::Utf8Str &aName, com::Utf8Str &aValue,
                                     LONG64 *aTimestamp, com::Utf8Str &aFlags) const;
    HRESULT i_setGuestPropertyToVM(const com::Utf8Str &aName, const com::Utf8Str &aValue,
                                   const com::Utf8Str &aFlags);
    HRESULT i_enumerateGuestPropertiesInService(const com::Utf8Str &aPatterns,
                                                std::vector<com::Utf8Str> &aNames,
                                                std::vector<com::Utf8Str> &aValues,
                                                std::vector<LONG64> &aTimestamps,
                                                std::vector<com::Utf8Str> &aFlags);
    HRESULT i_enumerateGuestPropertiesOnVM(const com::Utf8Str &aPatterns,
                                           std::vector<com::Utf8Str> &aNames,
                                           std::vector<com::Utf8Str> &aValues,
                                           std::vector<LONG64> &aTimestamps,
                                           std::vector<com::Utf8Str> &aFlags);

#endif /* VBOX_WITH_GUEST_PROPS */

#ifdef VBOX_WITH_RESOURCE_USAGE_API
    void i_getDiskList(MediaList &list);
    void i_registerMetrics(PerformanceCollector *aCollector, Machine *aMachine, RTPROCESS pid);

    pm::CollectorGuest     *mCollectorGuest;
#endif /* VBOX_WITH_RESOURCE_USAGE_API */

    Machine * const         mPeer;

    VirtualBox * const      mParent;

    Shareable<Data>         mData;
    Shareable<SSData>       mSSData;

    Backupable<UserData>    mUserData;
    Backupable<HWData>      mHWData;
    Backupable<MediaData>   mMediaData;

    // the following fields need special backup/rollback/commit handling,
    // so they cannot be a part of HWData

    const ComObjPtr<VRDEServer>        mVRDEServer;
    const ComObjPtr<SerialPort>        mSerialPorts[SchemaDefs::SerialPortCount];
    const ComObjPtr<ParallelPort>      mParallelPorts[SchemaDefs::ParallelPortCount];
    const ComObjPtr<AudioAdapter>      mAudioAdapter;
    const ComObjPtr<USBDeviceFilters>  mUSBDeviceFilters;
    const ComObjPtr<BIOSSettings>      mBIOSSettings;
    const ComObjPtr<BandwidthControl>  mBandwidthControl;

    typedef std::vector<ComObjPtr<NetworkAdapter> > NetworkAdapterVector;
    NetworkAdapterVector               mNetworkAdapters;

    typedef std::list<ComObjPtr<StorageController> > StorageControllerList;
    Backupable<StorageControllerList>  mStorageControllers;

    typedef std::list<ComObjPtr<USBController> > USBControllerList;
    Backupable<USBControllerList>      mUSBControllers;

    uint64_t                        uRegistryNeedsSaving;

    friend class SessionMachine;
    friend class SnapshotMachine;
    friend class Appliance;
    friend class VirtualBox;

    friend class MachineCloneVM;

private:
    // wrapped IMachine properties
    HRESULT getParent(ComPtr<IVirtualBox> &aParent);
    HRESULT getIcon(std::vector<BYTE> &aIcon);
    HRESULT setIcon(const std::vector<BYTE> &aIcon);
    HRESULT getAccessible(BOOL *aAccessible);
    HRESULT getAccessError(ComPtr<IVirtualBoxErrorInfo> &aAccessError);
    HRESULT getName(com::Utf8Str &aName);
    HRESULT setName(const com::Utf8Str &aName);
    HRESULT getDescription(com::Utf8Str &aDescription);
    HRESULT setDescription(const com::Utf8Str &aDescription);
    HRESULT getId(com::Guid &aId);
    HRESULT getGroups(std::vector<com::Utf8Str> &aGroups);
    HRESULT setGroups(const std::vector<com::Utf8Str> &aGroups);
    HRESULT getOSTypeId(com::Utf8Str &aOSTypeId);
    HRESULT setOSTypeId(const com::Utf8Str &aOSTypeId);
    HRESULT getHardwareVersion(com::Utf8Str &aHardwareVersion);
    HRESULT setHardwareVersion(const com::Utf8Str &aHardwareVersion);
    HRESULT getHardwareUUID(com::Guid &aHardwareUUID);
    HRESULT setHardwareUUID(const com::Guid &aHardwareUUID);
    HRESULT getCPUCount(ULONG *aCPUCount);
    HRESULT setCPUCount(ULONG aCPUCount);
    HRESULT getCPUHotPlugEnabled(BOOL *aCPUHotPlugEnabled);
    HRESULT setCPUHotPlugEnabled(BOOL aCPUHotPlugEnabled);
    HRESULT getCPUExecutionCap(ULONG *aCPUExecutionCap);
    HRESULT setCPUExecutionCap(ULONG aCPUExecutionCap);
    HRESULT getMemorySize(ULONG *aMemorySize);
    HRESULT setMemorySize(ULONG aMemorySize);
    HRESULT getMemoryBalloonSize(ULONG *aMemoryBalloonSize);
    HRESULT setMemoryBalloonSize(ULONG aMemoryBalloonSize);
    HRESULT getPageFusionEnabled(BOOL *aPageFusionEnabled);
    HRESULT setPageFusionEnabled(BOOL aPageFusionEnabled);
    HRESULT getGraphicsControllerType(GraphicsControllerType_T *aGraphicsControllerType);
    HRESULT setGraphicsControllerType(GraphicsControllerType_T aGraphicsControllerType);
    HRESULT getVRAMSize(ULONG *aVRAMSize);
    HRESULT setVRAMSize(ULONG aVRAMSize);
    HRESULT getAccelerate3DEnabled(BOOL *aAccelerate3DEnabled);
    HRESULT setAccelerate3DEnabled(BOOL aAccelerate3DEnabled);
    HRESULT getAccelerate2DVideoEnabled(BOOL *aAccelerate2DVideoEnabled);
    HRESULT setAccelerate2DVideoEnabled(BOOL aAccelerate2DVideoEnabled);
    HRESULT getMonitorCount(ULONG *aMonitorCount);
    HRESULT setMonitorCount(ULONG aMonitorCount);
    HRESULT getVideoCaptureEnabled(BOOL *aVideoCaptureEnabled);
    HRESULT setVideoCaptureEnabled(BOOL aVideoCaptureEnabled);
    HRESULT getVideoCaptureScreens(std::vector<BOOL> &aVideoCaptureScreens);
    HRESULT setVideoCaptureScreens(const std::vector<BOOL> &aVideoCaptureScreens);
    HRESULT getVideoCaptureFile(com::Utf8Str &aVideoCaptureFile);
    HRESULT setVideoCaptureFile(const com::Utf8Str &aVideoCaptureFile);
    HRESULT getVideoCaptureWidth(ULONG *aVideoCaptureWidth);
    HRESULT setVideoCaptureWidth(ULONG aVideoCaptureWidth);
    HRESULT getVideoCaptureHeight(ULONG *aVideoCaptureHeight);
    HRESULT setVideoCaptureHeight(ULONG aVideoCaptureHeight);
    HRESULT getVideoCaptureRate(ULONG *aVideoCaptureRate);
    HRESULT setVideoCaptureRate(ULONG aVideoCaptureRate);
    HRESULT getVideoCaptureFPS(ULONG *aVideoCaptureFPS);
    HRESULT setVideoCaptureFPS(ULONG aVideoCaptureFPS);
    HRESULT getBIOSSettings(ComPtr<IBIOSSettings> &aBIOSSettings);
    HRESULT getFirmwareType(FirmwareType_T *aFirmwareType);
    HRESULT setFirmwareType(FirmwareType_T aFirmwareType);
    HRESULT getPointingHIDType(PointingHIDType_T *aPointingHIDType);
    HRESULT setPointingHIDType(PointingHIDType_T aPointingHIDType);
    HRESULT getKeyboardHIDType(KeyboardHIDType_T *aKeyboardHIDType);
    HRESULT setKeyboardHIDType(KeyboardHIDType_T aKeyboardHIDType);
    HRESULT getHPETEnabled(BOOL *aHPETEnabled);
    HRESULT setHPETEnabled(BOOL aHPETEnabled);
    HRESULT getChipsetType(ChipsetType_T *aChipsetType);
    HRESULT setChipsetType(ChipsetType_T aChipsetType);
    HRESULT getSnapshotFolder(com::Utf8Str &aSnapshotFolder);
    HRESULT setSnapshotFolder(const com::Utf8Str &aSnapshotFolder);
    HRESULT getVRDEServer(ComPtr<IVRDEServer> &aVRDEServer);
    HRESULT getEmulatedUSBCardReaderEnabled(BOOL *aEmulatedUSBCardReaderEnabled);
    HRESULT setEmulatedUSBCardReaderEnabled(BOOL aEmulatedUSBCardReaderEnabled);
    HRESULT getMediumAttachments(std::vector<ComPtr<IMediumAttachment> > &aMediumAttachments);
    HRESULT getUSBControllers(std::vector<ComPtr<IUSBController> > &aUSBControllers);
    HRESULT getUSBDeviceFilters(ComPtr<IUSBDeviceFilters> &aUSBDeviceFilters);
    HRESULT getAudioAdapter(ComPtr<IAudioAdapter> &aAudioAdapter);
    HRESULT getStorageControllers(std::vector<ComPtr<IStorageController> > &aStorageControllers);
    HRESULT getSettingsFilePath(com::Utf8Str &aSettingsFilePath);
    HRESULT getSettingsModified(BOOL *aSettingsModified);
    HRESULT getSessionState(SessionState_T *aSessionState);
    HRESULT getSessionType(com::Utf8Str &aSessionType);
    HRESULT getSessionPID(ULONG *aSessionPID);
    HRESULT getState(MachineState_T *aState);
    HRESULT getLastStateChange(LONG64 *aLastStateChange);
    HRESULT getStateFilePath(com::Utf8Str &aStateFilePath);
    HRESULT getLogFolder(com::Utf8Str &aLogFolder);
    HRESULT getCurrentSnapshot(ComPtr<ISnapshot> &aCurrentSnapshot);
    HRESULT getSnapshotCount(ULONG *aSnapshotCount);
    HRESULT getCurrentStateModified(BOOL *aCurrentStateModified);
    HRESULT getSharedFolders(std::vector<ComPtr<ISharedFolder> > &aSharedFolders);
    HRESULT getClipboardMode(ClipboardMode_T *aClipboardMode);
    HRESULT setClipboardMode(ClipboardMode_T aClipboardMode);
    HRESULT getDnDMode(DnDMode_T *aDnDMode);
    HRESULT setDnDMode(DnDMode_T aDnDMode);
    HRESULT getGuestPropertyNotificationPatterns(com::Utf8Str &aGuestPropertyNotificationPatterns);
    HRESULT setGuestPropertyNotificationPatterns(const com::Utf8Str &aGuestPropertyNotificationPatterns);
    HRESULT getTeleporterEnabled(BOOL *aTeleporterEnabled);
    HRESULT setTeleporterEnabled(BOOL aTeleporterEnabled);
    HRESULT getTeleporterPort(ULONG *aTeleporterPort);
    HRESULT setTeleporterPort(ULONG aTeleporterPort);
    HRESULT getTeleporterAddress(com::Utf8Str &aTeleporterAddress);
    HRESULT setTeleporterAddress(const com::Utf8Str &aTeleporterAddress);
    HRESULT getTeleporterPassword(com::Utf8Str &aTeleporterPassword);
    HRESULT setTeleporterPassword(const com::Utf8Str &aTeleporterPassword);
    HRESULT getParavirtProvider(ParavirtProvider_T *aParavirtProvider);
    HRESULT setParavirtProvider(ParavirtProvider_T aParavirtProvider);
    HRESULT getFaultToleranceState(FaultToleranceState_T *aFaultToleranceState);
    HRESULT setFaultToleranceState(FaultToleranceState_T aFaultToleranceState);
    HRESULT getFaultTolerancePort(ULONG *aFaultTolerancePort);
    HRESULT setFaultTolerancePort(ULONG aFaultTolerancePort);
    HRESULT getFaultToleranceAddress(com::Utf8Str &aFaultToleranceAddress);
    HRESULT setFaultToleranceAddress(const com::Utf8Str &aFaultToleranceAddress);
    HRESULT getFaultTolerancePassword(com::Utf8Str &aFaultTolerancePassword);
    HRESULT setFaultTolerancePassword(const com::Utf8Str &aFaultTolerancePassword);
    HRESULT getFaultToleranceSyncInterval(ULONG *aFaultToleranceSyncInterval);
    HRESULT setFaultToleranceSyncInterval(ULONG aFaultToleranceSyncInterval);
    HRESULT getRTCUseUTC(BOOL *aRTCUseUTC);
    HRESULT setRTCUseUTC(BOOL aRTCUseUTC);
    HRESULT getIOCacheEnabled(BOOL *aIOCacheEnabled);
    HRESULT setIOCacheEnabled(BOOL aIOCacheEnabled);
    HRESULT getIOCacheSize(ULONG *aIOCacheSize);
    HRESULT setIOCacheSize(ULONG aIOCacheSize);
    HRESULT getPCIDeviceAssignments(std::vector<ComPtr<IPCIDeviceAttachment> > &aPCIDeviceAssignments);
    HRESULT getBandwidthControl(ComPtr<IBandwidthControl> &aBandwidthControl);
    HRESULT getTracingEnabled(BOOL *aTracingEnabled);
    HRESULT setTracingEnabled(BOOL aTracingEnabled);
    HRESULT getTracingConfig(com::Utf8Str &aTracingConfig);
    HRESULT setTracingConfig(const com::Utf8Str &aTracingConfig);
    HRESULT getAllowTracingToAccessVM(BOOL *aAllowTracingToAccessVM);
    HRESULT setAllowTracingToAccessVM(BOOL aAllowTracingToAccessVM);
    HRESULT getAutostartEnabled(BOOL *aAutostartEnabled);
    HRESULT setAutostartEnabled(BOOL aAutostartEnabled);
    HRESULT getAutostartDelay(ULONG *aAutostartDelay);
    HRESULT setAutostartDelay(ULONG aAutostartDelay);
    HRESULT getAutostopType(AutostopType_T *aAutostopType);
    HRESULT setAutostopType(AutostopType_T aAutostopType);
    HRESULT getDefaultFrontend(com::Utf8Str &aDefaultFrontend);
    HRESULT setDefaultFrontend(const com::Utf8Str &aDefaultFrontend);
    HRESULT getUSBProxyAvailable(BOOL *aUSBProxyAvailable);

    // wrapped IMachine methods
    HRESULT lockMachine(const ComPtr<ISession> &aSession,
                        LockType_T aLockType);
    HRESULT launchVMProcess(const ComPtr<ISession> &aSession,
                            const com::Utf8Str &aType,
                            const com::Utf8Str &aEnvironment,
                            ComPtr<IProgress> &aProgress);
    HRESULT setBootOrder(ULONG aPosition,
                         DeviceType_T aDevice);
    HRESULT getBootOrder(ULONG aPosition,
                         DeviceType_T *aDevice);
    HRESULT attachDevice(const com::Utf8Str &aName,
                         LONG aControllerPort,
                         LONG aDevice,
                         DeviceType_T aType,
                         const ComPtr<IMedium> &aMedium);
    HRESULT attachDeviceWithoutMedium(const com::Utf8Str &aName,
                                      LONG aControllerPort,
                                      LONG aDevice,
                                      DeviceType_T aType);
    HRESULT detachDevice(const com::Utf8Str &aName,
                         LONG aControllerPort,
                         LONG aDevice);
    HRESULT passthroughDevice(const com::Utf8Str &aName,
                              LONG aControllerPort,
                              LONG aDevice,
                              BOOL aPassthrough);
    HRESULT temporaryEjectDevice(const com::Utf8Str &aName,
                                 LONG aControllerPort,
                                 LONG aDevice,
                                 BOOL aTemporaryEject);
    HRESULT nonRotationalDevice(const com::Utf8Str &aName,
                                LONG aControllerPort,
                                LONG aDevice,
                                BOOL aNonRotational);
    HRESULT setAutoDiscardForDevice(const com::Utf8Str &aName,
                                    LONG aControllerPort,
                                    LONG aDevice,
                                    BOOL aDiscard);
    HRESULT setHotPluggableForDevice(const com::Utf8Str &aName,
                                     LONG aControllerPort,
                                     LONG aDevice,
                                     BOOL aHotPluggable);
    HRESULT setBandwidthGroupForDevice(const com::Utf8Str &aName,
                                       LONG aControllerPort,
                                       LONG aDevice,
                                       const ComPtr<IBandwidthGroup> &aBandwidthGroup);
    HRESULT setNoBandwidthGroupForDevice(const com::Utf8Str &aName,
                                         LONG aControllerPort,
                                         LONG aDevice);
    HRESULT unmountMedium(const com::Utf8Str &aName,
                          LONG aControllerPort,
                          LONG aDevice,
                          BOOL aForce);
    HRESULT mountMedium(const com::Utf8Str &aName,
                        LONG aControllerPort,
                        LONG aDevice,
                        const ComPtr<IMedium> &aMedium,
                        BOOL aForce);
    HRESULT getMedium(const com::Utf8Str &aName,
                      LONG aControllerPort,
                      LONG aDevice,
                      ComPtr<IMedium> &aMedium);
    HRESULT getMediumAttachmentsOfController(const com::Utf8Str &aName,
                                             std::vector<ComPtr<IMediumAttachment> > &aMediumAttachments);
    HRESULT getMediumAttachment(const com::Utf8Str &aName,
                                LONG aControllerPort,
                                LONG aDevice,
                                ComPtr<IMediumAttachment> &aAttachment);
    HRESULT attachHostPCIDevice(LONG aHostAddress,
                                LONG aDesiredGuestAddress,
                                BOOL aTryToUnbind);
    HRESULT detachHostPCIDevice(LONG aHostAddress);
    HRESULT getNetworkAdapter(ULONG aSlot,
                              ComPtr<INetworkAdapter> &aAdapter);
    HRESULT addStorageController(const com::Utf8Str &aName,
                                 StorageBus_T aConnectionType,
                                 ComPtr<IStorageController> &aController);
    HRESULT getStorageControllerByName(const com::Utf8Str &aName,
                                       ComPtr<IStorageController> &aStorageController);
    HRESULT getStorageControllerByInstance(ULONG aInstance,
                                           ComPtr<IStorageController> &aStorageController);
    HRESULT removeStorageController(const com::Utf8Str &aName);
    HRESULT setStorageControllerBootable(const com::Utf8Str &aName,
                                         BOOL aBootable);
    HRESULT addUSBController(const com::Utf8Str &aName,
                             USBControllerType_T aType,
                             ComPtr<IUSBController> &aController);
    HRESULT removeUSBController(const com::Utf8Str &aName);
    HRESULT getUSBControllerByName(const com::Utf8Str &aName,
                                   ComPtr<IUSBController> &aController);
    HRESULT getUSBControllerCountByType(USBControllerType_T aType,
                                        ULONG *aControllers);
    HRESULT getSerialPort(ULONG aSlot,
                          ComPtr<ISerialPort> &aPort);
    HRESULT getParallelPort(ULONG aSlot,
                            ComPtr<IParallelPort> &aPort);
    HRESULT getExtraDataKeys(std::vector<com::Utf8Str> &aKeys);
    HRESULT getExtraData(const com::Utf8Str &aKey,
                         com::Utf8Str &aValue);
    HRESULT setExtraData(const com::Utf8Str &aKey,
                         const com::Utf8Str &aValue);
    HRESULT getCPUProperty(CPUPropertyType_T aProperty,
                           BOOL *aValue);
    HRESULT setCPUProperty(CPUPropertyType_T aProperty,
                           BOOL aValue);
    HRESULT getCPUIDLeaf(ULONG aId,
                         ULONG *aValEax,
                         ULONG *aValEbx,
                         ULONG *aValEcx,
                         ULONG *aValEdx);
    HRESULT setCPUIDLeaf(ULONG aId,
                         ULONG aValEax,
                         ULONG aValEbx,
                         ULONG aValEcx,
                         ULONG aValEdx);
    HRESULT removeCPUIDLeaf(ULONG aId);
    HRESULT removeAllCPUIDLeaves();
    HRESULT getHWVirtExProperty(HWVirtExPropertyType_T aProperty,
                                BOOL *aValue);
    HRESULT setHWVirtExProperty(HWVirtExPropertyType_T aProperty,
                                BOOL aValue);
    HRESULT setSettingsFilePath(const com::Utf8Str &aSettingsFilePath,
                                ComPtr<IProgress> &aProgress);
    HRESULT saveSettings();
    HRESULT discardSettings();
    HRESULT unregister(CleanupMode_T aCleanupMode,
                       std::vector<ComPtr<IMedium> > &aMedia);
    HRESULT deleteConfig(const std::vector<ComPtr<IMedium> > &aMedia,
                         ComPtr<IProgress> &aProgress);
    HRESULT exportTo(const ComPtr<IAppliance> &aAppliance,
                     const com::Utf8Str &aLocation,
                     ComPtr<IVirtualSystemDescription> &aDescription);
    HRESULT findSnapshot(const com::Utf8Str &aNameOrId,
                         ComPtr<ISnapshot> &aSnapshot);
    HRESULT createSharedFolder(const com::Utf8Str &aName,
                               const com::Utf8Str &aHostPath,
                               BOOL aWritable,
                               BOOL aAutomount);
    HRESULT removeSharedFolder(const com::Utf8Str &aName);
    HRESULT canShowConsoleWindow(BOOL *aCanShow);
    HRESULT showConsoleWindow(LONG64 *aWinId);
    HRESULT getGuestProperty(const com::Utf8Str &aName,
                             com::Utf8Str &aValue,
                             LONG64 *aTimestamp,
                             com::Utf8Str &aFlags);
    HRESULT getGuestPropertyValue(const com::Utf8Str &aProperty,
                                  com::Utf8Str &aValue);
    HRESULT getGuestPropertyTimestamp(const com::Utf8Str &aProperty,
                                      LONG64 *aValue);
    HRESULT setGuestProperty(const com::Utf8Str &aProperty,
                             const com::Utf8Str &aValue,
                             const com::Utf8Str &aFlags);
    HRESULT setGuestPropertyValue(const com::Utf8Str &aProperty,
                                  const com::Utf8Str &aValue);
    HRESULT deleteGuestProperty(const com::Utf8Str &aName);
    HRESULT enumerateGuestProperties(const com::Utf8Str &aPatterns,
                                     std::vector<com::Utf8Str> &aNames,
                                     std::vector<com::Utf8Str> &aValues,
                                     std::vector<LONG64> &aTimestamps,
                                     std::vector<com::Utf8Str> &aFlags);
    HRESULT querySavedGuestScreenInfo(ULONG aScreenId,
                                      ULONG *aOriginX,
                                      ULONG *aOriginY,
                                      ULONG *aWidth,
                                      ULONG *aHeight,
                                      BOOL *aEnabled);
    HRESULT querySavedThumbnailSize(ULONG aScreenId,
                                    ULONG *aSize,
                                    ULONG *aWidth,
                                    ULONG *aHeight);
    HRESULT readSavedThumbnailToArray(ULONG aScreenId,
                                      BOOL aBGR,
                                      ULONG *aWidth,
                                      ULONG *aHeight,
                                      std::vector<BYTE> &aData);
    HRESULT readSavedThumbnailPNGToArray(ULONG aScreenId,
                                         ULONG *aWidth,
                                         ULONG *aHeight,
                                         std::vector<BYTE> &aData);
    HRESULT querySavedScreenshotPNGSize(ULONG aScreenId,
                                        ULONG *aSize,
                                        ULONG *aWidth,
                                        ULONG *aHeight);
    HRESULT readSavedScreenshotPNGToArray(ULONG aScreenId,
                                          ULONG *aWidth,
                                          ULONG *aHeight,
                                          std::vector<BYTE> &aData);
    HRESULT hotPlugCPU(ULONG aCpu);
    HRESULT hotUnplugCPU(ULONG aCpu);
    HRESULT getCPUStatus(ULONG aCpu,
                         BOOL *aAttached);
    HRESULT getEffectiveParavirtProvider(ParavirtProvider_T *aParavirtProvider);
    HRESULT queryLogFilename(ULONG aIdx,
                             com::Utf8Str &aFilename);
    HRESULT readLog(ULONG aIdx,
                    LONG64 aOffset,
                    LONG64 aSize,
                    std::vector<BYTE> &aData);
    HRESULT cloneTo(const ComPtr<IMachine> &aTarget,
                    CloneMode_T aMode,
                    const std::vector<CloneOptions_T> &aOptions,
                    ComPtr<IProgress> &aProgress);

    // wrapped IInternalMachineControl properties

    // wrapped IInternalMachineControl methods
    HRESULT setRemoveSavedStateFile(BOOL aRemove);
    HRESULT updateState(MachineState_T aState);
    HRESULT beginPowerUp(const ComPtr<IProgress> &aProgress);
    HRESULT endPowerUp(LONG aResult);
    HRESULT beginPoweringDown(ComPtr<IProgress> &aProgress);
    HRESULT endPoweringDown(LONG aResult,
                            const com::Utf8Str &aErrMsg);
    HRESULT runUSBDeviceFilters(const ComPtr<IUSBDevice> &aDevice,
                                BOOL *aMatched,
                                ULONG *aMaskedInterfaces);
    HRESULT captureUSBDevice(const com::Guid &aId);
    HRESULT detachUSBDevice(const com::Guid &aId,
                            BOOL aDone);
    HRESULT autoCaptureUSBDevices();
    HRESULT detachAllUSBDevices(BOOL aDone);
    HRESULT onSessionEnd(const ComPtr<ISession> &aSession,
                         ComPtr<IProgress> &aProgress);
    HRESULT beginSavingState(ComPtr<IProgress> &aProgress,
                             com::Utf8Str &aStateFilePath);
    HRESULT endSavingState(LONG aResult,
                           const com::Utf8Str &aErrMsg);
    HRESULT adoptSavedState(const com::Utf8Str &aSavedStateFile);
    HRESULT beginTakingSnapshot(const ComPtr<IConsole> &aInitiator,
                                const com::Utf8Str &aName,
                                const com::Utf8Str &aDescription,
                                const ComPtr<IProgress> &aConsoleProgress,
                                BOOL aFTakingSnapshotOnline,
                                com::Utf8Str &aStateFilePath);
    HRESULT endTakingSnapshot(BOOL aSuccess);
    HRESULT deleteSnapshot(const ComPtr<IConsole> &aInitiator,
                           const com::Guid &aStartId,
                           const com::Guid &aEndId,
                           BOOL aDeleteAllChildren,
                           MachineState_T *aMachineState,
                           ComPtr<IProgress> &aProgress);
    HRESULT finishOnlineMergeMedium();
    HRESULT restoreSnapshot(const ComPtr<IConsole> &aInitiator,
                            const ComPtr<ISnapshot> &aSnapshot,
                            MachineState_T *aMachineState,
                            ComPtr<IProgress> &aProgress);
    HRESULT pullGuestProperties(std::vector<com::Utf8Str> &aNames,
                                std::vector<com::Utf8Str> &aValues,
                                std::vector<LONG64> &aTimestamps,
                                std::vector<com::Utf8Str> &aFlags);
    HRESULT pushGuestProperty(const com::Utf8Str &aName,
                              const com::Utf8Str &aValue,
                              LONG64 aTimestamp,
                              const com::Utf8Str &aFlags);
    HRESULT lockMedia();
    HRESULT unlockMedia();
    HRESULT ejectMedium(const ComPtr<IMediumAttachment> &aAttachment,
                        ComPtr<IMediumAttachment> &aNewAttachment);
    HRESULT reportVmStatistics(ULONG aValidStats,
                               ULONG aCpuUser,
                               ULONG aCpuKernel,
                               ULONG aCpuIdle,
                               ULONG aMemTotal,
                               ULONG aMemFree,
                               ULONG aMemBalloon,
                               ULONG aMemShared,
                               ULONG aMemCache,
                               ULONG aPagedTotal,
                               ULONG aMemAllocTotal,
                               ULONG aMemFreeTotal,
                               ULONG aMemBalloonTotal,
                               ULONG aMemSharedTotal,
                               ULONG aVmNetRx,
                               ULONG aVmNetTx);


};

// SessionMachine class
////////////////////////////////////////////////////////////////////////////////

/**
 *  @note Notes on locking objects of this class:
 *  SessionMachine shares some data with the primary Machine instance (pointed
 *  to by the |mPeer| member). In order to provide data consistency it also
 *  shares its lock handle. This means that whenever you lock a SessionMachine
 *  instance using Auto[Reader]Lock or AutoMultiLock, the corresponding Machine
 *  instance is also locked in the same lock mode. Keep it in mind.
 */
class ATL_NO_VTABLE SessionMachine :
    public Machine
{
public:
    VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(SessionMachine, IMachine)

    DECLARE_NOT_AGGREGATABLE(SessionMachine)

    DECLARE_PROTECT_FINAL_CONSTRUCT()

    BEGIN_COM_MAP(SessionMachine)
        VBOX_DEFAULT_INTERFACE_ENTRIES(IMachine)
        COM_INTERFACE_ENTRY(IInternalMachineControl)
    END_COM_MAP()

    DECLARE_EMPTY_CTOR_DTOR(SessionMachine)

    HRESULT FinalConstruct();
    void FinalRelease();

    struct Uninit
    {
        enum Reason { Unexpected, Abnormal, Normal };
    };

    // public initializer/uninitializer for internal purposes only
    HRESULT init(Machine *aMachine);
    void uninit() { uninit(Uninit::Unexpected); }
    void uninit(Uninit::Reason aReason);


    // util::Lockable interface
    RWLockHandle *lockHandle() const;

    // IInternalMachineControl methods
    STDMETHOD(SetRemoveSavedStateFile)(BOOL aRemove);
    STDMETHOD(UpdateState)(MachineState_T machineState);
    STDMETHOD(BeginPowerUp)(IProgress *aProgress);
    STDMETHOD(EndPowerUp)(LONG iResult);
    STDMETHOD(BeginPoweringDown)(IProgress **aProgress);
    STDMETHOD(EndPoweringDown)(LONG aResult, IN_BSTR aErrMsg);
    STDMETHOD(RunUSBDeviceFilters)(IUSBDevice *aUSBDevice, BOOL *aMatched, ULONG *aMaskedIfs);
    STDMETHOD(CaptureUSBDevice)(IN_BSTR aId);
    STDMETHOD(DetachUSBDevice)(IN_BSTR aId, BOOL aDone);
    STDMETHOD(AutoCaptureUSBDevices)();
    STDMETHOD(DetachAllUSBDevices)(BOOL aDone);
    STDMETHOD(OnSessionEnd)(ISession *aSession, IProgress **aProgress);
    STDMETHOD(BeginSavingState)(IProgress **aProgress, BSTR *aStateFilePath);
    STDMETHOD(EndSavingState)(LONG aResult, IN_BSTR aErrMsg);
    STDMETHOD(AdoptSavedState)(IN_BSTR aSavedStateFile);
    STDMETHOD(BeginTakingSnapshot)(IConsole *aInitiator,
                                   IN_BSTR aName,
                                   IN_BSTR aDescription,
                                   IProgress *aConsoleProgress,
                                   BOOL fTakingSnapshotOnline,
                                   BSTR *aStateFilePath);
    STDMETHOD(EndTakingSnapshot)(BOOL aSuccess);
    STDMETHOD(DeleteSnapshot)(IConsole *aInitiator, IN_BSTR aStartId,
                              IN_BSTR aEndID, BOOL fDeleteAllChildren,
                              MachineState_T *aMachineState, IProgress **aProgress);
    STDMETHOD(FinishOnlineMergeMedium)();
    STDMETHOD(RestoreSnapshot)(IConsole *aInitiator,
                               ISnapshot *aSnapshot,
                               MachineState_T *aMachineState,
                               IProgress **aProgress);
    STDMETHOD(PullGuestProperties)(ComSafeArrayOut(BSTR, aNames), ComSafeArrayOut(BSTR, aValues),
              ComSafeArrayOut(LONG64, aTimestamps), ComSafeArrayOut(BSTR, aFlags));
    STDMETHOD(PushGuestProperty)(IN_BSTR aName, IN_BSTR aValue,
                                  LONG64 aTimestamp, IN_BSTR aFlags);
    STDMETHOD(LockMedia)();
    STDMETHOD(UnlockMedia)();
    STDMETHOD(EjectMedium)(IMediumAttachment *aAttachment,
                           IMediumAttachment **aNewAttachment);
    STDMETHOD(ReportVmStatistics)(ULONG aValidStats, ULONG aCpuUser,
                                  ULONG aCpuKernel, ULONG aCpuIdle,
                                  ULONG aMemTotal, ULONG aMemFree,
                                  ULONG aMemBalloon, ULONG aMemShared,
                                  ULONG aMemCache, ULONG aPageTotal,
                                  ULONG aAllocVMM, ULONG aFreeVMM,
                                  ULONG aBalloonedVMM, ULONG aSharedVMM,
                                  ULONG aVmNetRx, ULONG aVmNetTx);

    // public methods only for internal purposes

    virtual bool i_isSessionMachine() const
    {
        return true;
    }

#ifndef VBOX_WITH_GENERIC_SESSION_WATCHER
    bool i_checkForDeath();

    void i_getTokenId(Utf8Str &strTokenId);
#else /* VBOX_WITH_GENERIC_SESSION_WATCHER */
    IToken *i_getToken();
#endif /* VBOX_WITH_GENERIC_SESSION_WATCHER */
    // getClientToken must be only used by callers who can guarantee that
    // the object cannot be deleted in the mean time, i.e. have a caller/lock.
    ClientToken *i_getClientToken();

    HRESULT i_onNetworkAdapterChange(INetworkAdapter *networkAdapter, BOOL changeAdapter);
    HRESULT i_onNATRedirectRuleChange(ULONG ulSlot, BOOL aNatRuleRemove, IN_BSTR aRuleName,
                                      NATProtocol_T aProto, IN_BSTR aHostIp, LONG aHostPort,
                                      IN_BSTR aGuestIp, LONG aGuestPort);
    HRESULT i_onStorageControllerChange();
    HRESULT i_onMediumChange(IMediumAttachment *aMediumAttachment, BOOL aForce);
    HRESULT i_onSerialPortChange(ISerialPort *serialPort);
    HRESULT i_onParallelPortChange(IParallelPort *parallelPort);
    HRESULT i_onCPUChange(ULONG aCPU, BOOL aRemove);
    HRESULT i_onVRDEServerChange(BOOL aRestart);
    HRESULT i_onVideoCaptureChange();
    HRESULT i_onUSBControllerChange();
    HRESULT i_onUSBDeviceAttach(IUSBDevice *aDevice,
                                IVirtualBoxErrorInfo *aError,
                                ULONG aMaskedIfs);
    HRESULT i_onUSBDeviceDetach(IN_BSTR aId,
                                IVirtualBoxErrorInfo *aError);
    HRESULT i_onSharedFolderChange();
    HRESULT i_onClipboardModeChange(ClipboardMode_T aClipboardMode);
    HRESULT i_onDnDModeChange(DnDMode_T aDnDMode);
    HRESULT i_onBandwidthGroupChange(IBandwidthGroup *aBandwidthGroup);
    HRESULT i_onStorageDeviceChange(IMediumAttachment *aMediumAttachment, BOOL aRemove, BOOL aSilent);
    HRESULT i_onCPUExecutionCapChange(ULONG aCpuExecutionCap);

    bool i_hasMatchingUSBFilter(const ComObjPtr<HostUSBDevice> &aDevice, ULONG *aMaskedIfs);

    HRESULT lockMedia();
    HRESULT unlockMedia();

private:

    struct ConsoleTaskData
    {
        ConsoleTaskData()
            : mLastState(MachineState_Null), mDeleteSnapshotInfo(NULL)
        { }

        MachineState_T mLastState;
        ComObjPtr<Progress> mProgress;

        // used when taking snapshot
        ComObjPtr<Snapshot> mSnapshot;

        // used when deleting online snapshot
        void *mDeleteSnapshotInfo;

        // used when saving state (either as part of a snapshot or separate)
        Utf8Str strStateFilePath;
    };

    struct SnapshotTask;
    struct DeleteSnapshotTask;
    struct RestoreSnapshotTask;

    friend struct DeleteSnapshotTask;
    friend struct RestoreSnapshotTask;

    HRESULT endSavingState(HRESULT aRC, const Utf8Str &aErrMsg);
    void i_releaseSavedStateFile(const Utf8Str &strSavedStateFile, Snapshot *pSnapshotToIgnore);

    void i_deleteSnapshotHandler(DeleteSnapshotTask &aTask);
    void i_restoreSnapshotHandler(RestoreSnapshotTask &aTask);

    HRESULT i_prepareDeleteSnapshotMedium(const ComObjPtr<Medium> &aHD,
                                          const Guid &machineId,
                                          const Guid &snapshotId,
                                          bool fOnlineMergePossible,
                                          MediumLockList *aVMMALockList,
                                          ComObjPtr<Medium> &aSource,
                                          ComObjPtr<Medium> &aTarget,
                                          bool &fMergeForward,
                                          ComObjPtr<Medium> &pParentForTarget,
                                          MediumLockList * &aChildrenToReparent,
                                          bool &fNeedOnlineMerge,
                                          MediumLockList * &aMediumLockList,
                                          ComPtr<IToken> &aHDLockToken);
    void i_cancelDeleteSnapshotMedium(const ComObjPtr<Medium> &aHD,
                                      const ComObjPtr<Medium> &aSource,
                                      MediumLockList *aChildrenToReparent,
                                      bool fNeedsOnlineMerge,
                                      MediumLockList *aMediumLockList,
                                      const ComPtr<IToken> &aHDLockToken,
                                      const Guid &aMediumId,
                                      const Guid &aSnapshotId);
    HRESULT i_onlineMergeMedium(const ComObjPtr<MediumAttachment> &aMediumAttachment,
                                const ComObjPtr<Medium> &aSource,
                                const ComObjPtr<Medium> &aTarget,
                                bool fMergeForward,
                                const ComObjPtr<Medium> &pParentForTarget,
                                MediumLockList *aChildrenToReparent,
                                MediumLockList *aMediumLockList,
                                ComObjPtr<Progress> &aProgress,
                                bool *pfNeedsMachineSaveSettings);

    HRESULT i_setMachineState(MachineState_T aMachineState);
    HRESULT i_updateMachineStateOnClient();

    HRESULT mRemoveSavedState;

    ConsoleTaskData mConsoleTaskData;

    /** client token for this machine */
    ClientToken *mClientToken;

    int miNATNetworksStarted;

    static DECLCALLBACK(int) taskHandler(RTTHREAD thread, void *pvUser);
};

// SnapshotMachine class
////////////////////////////////////////////////////////////////////////////////

/**
 *  @note Notes on locking objects of this class:
 *  SnapshotMachine shares some data with the primary Machine instance (pointed
 *  to by the |mPeer| member). In order to provide data consistency it also
 *  shares its lock handle. This means that whenever you lock a SessionMachine
 *  instance using Auto[Reader]Lock or AutoMultiLock, the corresponding Machine
 *  instance is also locked in the same lock mode. Keep it in mind.
 */
class ATL_NO_VTABLE SnapshotMachine :
    public Machine
{
public:
    VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(SnapshotMachine, IMachine)

    DECLARE_NOT_AGGREGATABLE(SnapshotMachine)

    DECLARE_PROTECT_FINAL_CONSTRUCT()

    BEGIN_COM_MAP(SnapshotMachine)
        VBOX_DEFAULT_INTERFACE_ENTRIES(IMachine)
    END_COM_MAP()

    DECLARE_EMPTY_CTOR_DTOR(SnapshotMachine)

    HRESULT FinalConstruct();
    void FinalRelease();

    // public initializer/uninitializer for internal purposes only
    HRESULT init(SessionMachine *aSessionMachine,
                 IN_GUID aSnapshotId,
                 const Utf8Str &aStateFilePath);
    HRESULT initFromSettings(Machine *aMachine,
                             const settings::Hardware &hardware,
                             const settings::Debugging *pDbg,
                             const settings::Autostart *pAutostart,
                             const settings::Storage &storage,
                             IN_GUID aSnapshotId,
                             const Utf8Str &aStateFilePath);
    void uninit();

    // util::Lockable interface
    RWLockHandle *lockHandle() const;

    // public methods only for internal purposes

    virtual bool i_isSnapshotMachine() const
    {
        return true;
    }

    HRESULT i_onSnapshotChange(Snapshot *aSnapshot);

    // unsafe inline public methods for internal purposes only (ensure there is
    // a caller and a read lock before calling them!)

    const Guid& i_getSnapshotId() const { return mSnapshotId; }

private:

    Guid mSnapshotId;
    /** This field replaces mPeer for SessionMachine instances, as having
     * a peer reference is plain meaningless and causes many subtle problems
     * with saving settings and the like. */
    Machine * const mMachine;

    friend class Snapshot;
};

// third party methods that depend on SnapshotMachine definition

inline const Guid &Machine::i_getSnapshotId() const
{
    return (i_isSnapshotMachine())
                ? static_cast<const SnapshotMachine*>(this)->i_getSnapshotId()
                : Guid::Empty;
}


#endif // ____H_MACHINEIMPL
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