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vm.h

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/** @file
 * VM - The Virtual Machine, data.
 */

/*
 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
 *
 * 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.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE 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.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 USA or visit http://www.sun.com if you need
 * additional information or have any questions.
 */

#ifndef ___VBox_vm_h
#define ___VBox_vm_h

#include <VBox/cdefs.h>
#include <VBox/types.h>
#include <VBox/cpum.h>
#include <VBox/stam.h>
#include <VBox/vmapi.h>
#include <VBox/sup.h>


/** @defgroup grp_vm    The Virtual Machine
 * @{
 */

/** Maximum number of virtual CPUs per VM. */
00046 #define VMCPU_MAX_CPU_COUNT    255

/**
 * The state of a virtual CPU.
 *
 * The VM running states are a sub-states of the VMSTATE_RUNNING state. While
 * VMCPUSTATE_NOT_RUNNING is a place holder for the other VM states.
 */
00054 typedef enum VMCPUSTATE
{
    /** The customary invalid zero. */
00057     VMCPUSTATE_INVALID = 0,

    /** Running guest code (VM running). */
00060     VMCPUSTATE_RUN_EXEC,
    /** Running guest code in the recompiler (VM running). */
00062     VMCPUSTATE_RUN_EXEC_REM,
    /** Halted (VM running). */
00064     VMCPUSTATE_RUN_HALTED,
    /** All the other bits we do while running a VM (VM running). */
00066     VMCPUSTATE_RUN_MISC,
    /** VM not running, we're servicing requests or whatever. */
00068     VMCPUSTATE_NOT_RUNNING,
    /** The end of valid virtual CPU states. */
00070     VMCPUSTATE_END,

    /** Ensure 32-bit type. */
00073     VMCPUSTATE_32BIT_HACK = 0x7fffffff
} VMCPUSTATE;


/**
 * Per virtual CPU data.
 */
00080 typedef struct VMCPU
{
    /** Per CPU forced action.
     * See the VMCPU_FF_* \#defines. Updated atomically. */
00084     uint32_t volatile       fForcedActions;
    /** The CPU state. */
00086     VMCPUSTATE volatile     enmState;

    /** Ring-3 Host Context VM Pointer. */
00089     PVMR3                   pVMR3;
    /** Ring-0 Host Context VM Pointer. */
00091     PVMR0                   pVMR0;
    /** Raw-mode Context VM Pointer. */
00093     PVMRC                   pVMRC;
    /** The CPU ID.
     * This is the index into the VM::aCpu array. */
00096     VMCPUID                 idCpu;
    /** The native thread handle. */
00098     RTNATIVETHREAD          hNativeThread;

    /** Align the next bit on a 64-byte boundary.
     *
     * @remarks The aligments of the members that are larger than 48 bytes should be
     *          64-byte for cache line reasons. structs containing small amounts of
     *          data could be lumped together at the end with a < 64 byte padding
     *          following it (to grow into and align the struct size).
     *   */
00107     uint32_t                au32Alignment[HC_ARCH_BITS == 32 ? 9 : 6];

    /** CPUM part. */
    union
    {
#ifdef ___CPUMInternal_h
        struct CPUMCPU      s;
#endif
        char                padding[2560];      /* multiple of 64 */
    } cpum;
    /** VMM part. */
    union
    {
#ifdef ___VMMInternal_h
        struct VMMCPU       s;
#endif
        char                padding[64];        /* multiple of 64 */
    } vmm;

    /** PGM part. */
    union
    {
#ifdef ___PGMInternal_h
        struct PGMCPU       s;
#endif
        char                padding[2048];       /* multiple of 64 */
    } pgm;

    /** HWACCM part. */
    union
    {
#ifdef ___HWACCMInternal_h
        struct HWACCMCPU    s;
#endif
        char                padding[5120];      /* multiple of 64 */
    } hwaccm;

    /** EM part. */
    union
    {
#ifdef ___EMInternal_h
        struct EMCPU        s;
#endif
        char                padding[64];        /* multiple of 64 */
    } em;

    /** TM part. */
    union
    {
#ifdef ___TMInternal_h
        struct TMCPU        s;
#endif
        char                padding[64];        /* multiple of 64 */
    } tm;
} VMCPU;

/** Pointer to a VMCPU. */
#ifndef ___VBox_types_h
00165 typedef struct VMCPU *PVMCPU;
#endif

/** The name of the Guest Context VMM Core module. */
00169 #define VMMGC_MAIN_MODULE_NAME          "VMMGC.gc"
/** The name of the Ring 0 Context VMM Core module. */
00171 #define VMMR0_MAIN_MODULE_NAME          "VMMR0.r0"

/** VM Forced Action Flags.
 *
 * Use the VM_FF_SET() and VM_FF_CLEAR() macros to change the force
 * action mask of a VM.
 *
 * @{
 */
/** This action forces the VM to service check and pending interrups on the APIC. */
00181 #define VM_FF_INTERRUPT_APIC            RT_BIT_32(0)
/** This action forces the VM to service check and pending interrups on the PIC. */
00183 #define VM_FF_INTERRUPT_PIC             RT_BIT_32(1)
/** This action forces the VM to schedule and run pending timer (TM). */
00185 #define VM_FF_TIMER                     RT_BIT_32(2)
/** PDM Queues are pending. */
00187 #define VM_FF_PDM_QUEUES                RT_BIT_32(3)
/** PDM DMA transfers are pending. */
00189 #define VM_FF_PDM_DMA                   RT_BIT_32(4)
/** PDM critical section unlocking is pending, process promptly upon return to R3. */
00191 #define VM_FF_PDM_CRITSECT              RT_BIT_32(5)

/** This action forces the VM to call DBGF so DBGF can service debugger
 * requests in the emulation thread.
 * This action flag stays asserted till DBGF clears it.*/
00196 #define VM_FF_DBGF                      RT_BIT_32(8)
/** This action forces the VM to service pending requests from other
 * thread or requests which must be executed in another context. */
00199 #define VM_FF_REQUEST                   RT_BIT_32(9)
/** Terminate the VM immediately. */
00201 #define VM_FF_TERMINATE                 RT_BIT_32(10)
/** Reset the VM. (postponed) */
00203 #define VM_FF_RESET                     RT_BIT_32(11)

/** This action forces the VM to resync the page tables before going
 * back to execute guest code. (GLOBAL FLUSH) */
00207 #define VM_FF_PGM_SYNC_CR3              RT_BIT_32(16)
/** Same as VM_FF_PGM_SYNC_CR3 except that global pages can be skipped.
 * (NON-GLOBAL FLUSH) */
00210 #define VM_FF_PGM_SYNC_CR3_NON_GLOBAL   RT_BIT_32(17)
/** PGM needs to allocate handy pages. */
00212 #define VM_FF_PGM_NEED_HANDY_PAGES      RT_BIT_32(18)
/** PGM is out of memory.
 * Abandon all loops and code paths which can be resumed and get up to the EM
 * loops. */
00216 #define VM_FF_PGM_NO_MEMORY             RT_BIT_32(19)
/** Check the interupt and trap gates */
00218 #define VM_FF_TRPM_SYNC_IDT             RT_BIT_32(20)
/** Check Guest's TSS ring 0 stack */
00220 #define VM_FF_SELM_SYNC_TSS             RT_BIT_32(21)
/** Check Guest's GDT table */
00222 #define VM_FF_SELM_SYNC_GDT             RT_BIT_32(22)
/** Check Guest's LDT table */
00224 #define VM_FF_SELM_SYNC_LDT             RT_BIT_32(23)
/** Inhibit interrupts pending. See EMGetInhibitInterruptsPC(). */
00226 #define VM_FF_INHIBIT_INTERRUPTS        RT_BIT_32(24)

/** CSAM needs to scan the page that's being executed */
00229 #define VM_FF_CSAM_SCAN_PAGE            RT_BIT_32(26)
/** CSAM needs to do some homework. */
00231 #define VM_FF_CSAM_PENDING_ACTION       RT_BIT_32(27)

/** Force return to Ring-3. */
00234 #define VM_FF_TO_R3                     RT_BIT_32(28)

/** REM needs to be informed about handler changes. */
00237 #define VM_FF_REM_HANDLER_NOTIFY        RT_BIT_32(29)

/** Suspend the VM - debug only. */
00240 #define VM_FF_DEBUG_SUSPEND             RT_BIT_32(31)

/** Externally forced actions. Used to quit the idle/wait loop. */
00243 #define VM_FF_EXTERNAL_SUSPENDED_MASK   (VM_FF_TERMINATE | VM_FF_DBGF | VM_FF_REQUEST)
/** Externally forced actions. Used to quit the idle/wait loop. */
00245 #define VM_FF_EXTERNAL_HALTED_MASK      (VM_FF_TERMINATE | VM_FF_DBGF | VM_FF_TIMER | VM_FF_INTERRUPT_APIC | VM_FF_INTERRUPT_PIC | VM_FF_REQUEST | VM_FF_PDM_QUEUES | VM_FF_PDM_DMA)
/** High priority pre-execution actions. */
00247 #define VM_FF_HIGH_PRIORITY_PRE_MASK    (VM_FF_TERMINATE | VM_FF_DBGF | VM_FF_INTERRUPT_APIC | VM_FF_INTERRUPT_PIC | VM_FF_TIMER | VM_FF_DEBUG_SUSPEND \
                                        | VM_FF_PGM_SYNC_CR3 | VM_FF_PGM_SYNC_CR3_NON_GLOBAL | VM_FF_SELM_SYNC_TSS | VM_FF_TRPM_SYNC_IDT | VM_FF_SELM_SYNC_GDT | VM_FF_SELM_SYNC_LDT | VM_FF_PGM_NEED_HANDY_PAGES | VM_FF_PGM_NO_MEMORY)
/** High priority pre raw-mode execution mask. */
00250 #define VM_FF_HIGH_PRIORITY_PRE_RAW_MASK (VM_FF_PGM_SYNC_CR3 | VM_FF_PGM_SYNC_CR3_NON_GLOBAL | VM_FF_SELM_SYNC_TSS | VM_FF_TRPM_SYNC_IDT | VM_FF_SELM_SYNC_GDT | VM_FF_SELM_SYNC_LDT \
                                         | VM_FF_PGM_NEED_HANDY_PAGES | VM_FF_INHIBIT_INTERRUPTS | VM_FF_PGM_NO_MEMORY)
/** High priority post-execution actions. */
00253 #define VM_FF_HIGH_PRIORITY_POST_MASK   (VM_FF_PDM_CRITSECT | VM_FF_CSAM_PENDING_ACTION | VM_FF_PGM_NO_MEMORY)
/** Normal priority post-execution actions. */
00255 #define VM_FF_NORMAL_PRIORITY_POST_MASK (VM_FF_TERMINATE | VM_FF_DBGF | VM_FF_RESET | VM_FF_CSAM_SCAN_PAGE | VM_FF_PGM_NO_MEMORY)
/** Normal priority actions. */
00257 #define VM_FF_NORMAL_PRIORITY_MASK      (VM_FF_REQUEST | VM_FF_PDM_QUEUES | VM_FF_PDM_DMA | VM_FF_REM_HANDLER_NOTIFY)
/** Flags to clear before resuming guest execution. */
00259 #define VM_FF_RESUME_GUEST_MASK         (VM_FF_TO_R3)
/** Flags that causes the HWACCM loops to go back to ring-3. */
00261 #define VM_FF_HWACCM_TO_R3_MASK         (VM_FF_TO_R3 | VM_FF_TIMER | VM_FF_PGM_NEED_HANDY_PAGES | VM_FF_PGM_NO_MEMORY)
/** All the forced flags. */
00263 #define VM_FF_ALL_MASK                  (~0U)
/** All the forced flags. */
00265 #define VM_FF_ALL_BUT_RAW_MASK          (~(VM_FF_HIGH_PRIORITY_PRE_RAW_MASK | VM_FF_CSAM_PENDING_ACTION | VM_FF_PDM_CRITSECT) | VM_FF_PGM_NO_MEMORY)

/** @} */

/** @def VM_FF_SET
 * Sets a force action flag.
 *
 * @param   pVM     VM Handle.
 * @param   fFlag   The flag to set.
 */
#if 1
00276 # define VM_FF_SET(pVM, fFlag)              ASMAtomicOrU32(&(pVM)->fForcedActions, (fFlag))
#else
# define VM_FF_SET(pVM, fFlag) \
    do { ASMAtomicOrU32(&(pVM)->fForcedActions, (fFlag)); \
         RTLogPrintf("VM_FF_SET  : %08x %s - %s(%d) %s\n", (pVM)->fForcedActions, #fFlag, __FILE__, __LINE__, __FUNCTION__); \
    } while (0)
#endif

/** @def VMCPU_FF_SET
 * Sets a force action flag for given VCPU.
 *
 * @param   pVM     VM Handle.
 * @param   idCpu   Virtual CPU ID.
 * @param   fFlag   The flag to set.
 */
#ifdef VBOX_WITH_SMP_GUESTS
# define VMCPU_FF_SET(pVM, idCpu, fFlag)    ASMAtomicOrU32(&(pVM)->aCpu[idCpu].fForcedActions, (fFlag))
#else
00294 # define VMCPU_FF_SET(pVM, idCpu, fFlag)    VM_FF_SET(pVM, fFlag)
#endif

/** @def VM_FF_CLEAR
 * Clears a force action flag.
 *
 * @param   pVM     VM Handle.
 * @param   fFlag   The flag to clear.
 */
#if 1
00304 # define VM_FF_CLEAR(pVM, fFlag)            ASMAtomicAndU32(&(pVM)->fForcedActions, ~(fFlag))
#else
# define VM_FF_CLEAR(pVM, fFlag) \
    do { ASMAtomicAndU32(&(pVM)->fForcedActions, ~(fFlag)); \
         RTLogPrintf("VM_FF_CLEAR: %08x %s - %s(%d) %s\n", (pVM)->fForcedActions, #fFlag, __FILE__, __LINE__, __FUNCTION__); \
    } while (0)
#endif

/** @def VMCPU_FF_CLEAR
 * Clears a force action flag for given VCPU.
 *
 * @param   pVM     VM Handle.
 * @param   idCpu   Virtual CPU ID.
 * @param   fFlag   The flag to clear.
 */
#ifdef VBOX_WITH_SMP_GUESTS
# define VMCPU_FF_CLEAR(pVM, idCpu, fFlag)  ASMAtomicAndU32(&(pVM)->aCpu[idCpu].fForcedActions, ~(fFlag))
#else
00322 # define VMCPU_FF_CLEAR(pVM, idCpu, fFlag)  VM_FF_CLEAR(pVM, fFlag)
#endif

/** @def VM_FF_ISSET
 * Checks if a force action flag is set.
 *
 * @param   pVM     VM Handle.
 * @param   fFlag   The flag to check.
 */
00331 #define VM_FF_ISSET(pVM, fFlag)             (((pVM)->fForcedActions & (fFlag)) == (fFlag))

/** @def VMCPU_FF_ISSET
 * Checks if a force action flag is set for given VCPU.
 *
 * @param   pVM     VM Handle.
 * @param   idCpu   Virtual CPU ID.
 * @param   fFlag   The flag to check.
 */
#ifdef VBOX_WITH_SMP_GUESTS
# define VMCPU_FF_ISSET(pVM, idCpu, fFlag)  (((pVM)->aCpu[idCpu].fForcedActions & (fFlag)) == (fFlag))
#else
00343 # define VMCPU_FF_ISSET(pVM, idCpu, fFlag)  VM_FF_ISSET(pVM, fFlag)
#endif

/** @def VM_FF_ISPENDING
 * Checks if one or more force action in the specified set is pending.
 *
 * @param   pVM     VM Handle.
 * @param   fFlags  The flags to check for.
 */
#define VM_FF_ISPENDING(pVM, fFlags)        ((pVM)->fForcedActions & (fFlags))

/** @def VMCPU_FF_ISPENDING
 * Checks if one or more force action in the specified set is pending for given VCPU.
 *
 * @param   pVM     VM Handle.
 * @param   idCpu   Virtual CPU ID.
 * @param   fFlags  The flags to check for.
 */
#ifdef VBOX_WITH_SMP_GUESTS
# define VMCPU_FF_ISPENDING(pVM, idCpu, fFlags) ((pVM)->aCpu[idCpu].fForcedActions & (fFlags))
#else
00364 # define VMCPU_FF_ISPENDING(pVM, idCpu, fFlags) VM_FF_ISPENDING(pVM, fFlags)
#endif

/** @def VM_FF_ISPENDING
 * Checks if one or more force action in the specified set is pending while one
 * or more other ones are not.
 *
 * @param   pVM     VM Handle.
 * @param   fFlags  The flags to check for.
 * @param   fExcpt  The flags that should not be set.
 */
#define VM_FF_IS_PENDING_EXCEPT(pVM, fFlags, fExcpt)            ( ((pVM)->fForcedActions & (fFlags)) && !((pVM)->fForcedActions & (fExcpt)) )

/** @def VMCPU_FF_IS_PENDING_EXCEPT
 * Checks if one or more force action in the specified set is pending for given
 * VCPU while one or more other ones are not.
 *
 * @param   pVM     VM Handle.
 * @param   idCpu   Virtual CPU ID.
 * @param   fFlags  The flags to check for.
 * @param   fExcpt  The flags that should not be set.
 */
#ifdef VBOX_WITH_SMP_GUESTS
# define VMCPU_FF_IS_PENDING_EXCEPT(pVM, idCpu, fFlags, fExcpt) ( ((pVM)->aCpu[idCpu].fForcedActions & (fFlags)) && !((pVM)->aCpu[idCpu].fForcedActions & (fExcpt)) )
#else
00389 # define VMCPU_FF_IS_PENDING_EXCEPT(pVM, idCpu, fFlags, fExcpt) VM_FF_ISPENDING(pVM, fFlags, fExcpt)
#endif

/** @def VM_IS_EMT
 * Checks if the current thread is the emulation thread (EMT).
 *
 * @remark  The ring-0 variation will need attention if we expand the ring-0
 *          code to let threads other than EMT mess around with the VM.
 */
#ifdef IN_RC
# define VM_IS_EMT(pVM)                     true
#elif defined(IN_RING0)
# define VM_IS_EMT(pVM)                     true
#else
/** @todo need to rework this macro for the case of multiple emulation threads for SMP */
00404 # define VM_IS_EMT(pVM)                     (VMR3GetVMCPUNativeThread(pVM) == RTThreadNativeSelf())
#endif

/** @def VM_ASSERT_EMT
 * Asserts that the current thread IS the emulation thread (EMT).
 */
#ifdef IN_RC
# define VM_ASSERT_EMT(pVM)                 Assert(VM_IS_EMT(pVM))
#elif defined(IN_RING0)
# define VM_ASSERT_EMT(pVM)                 Assert(VM_IS_EMT(pVM))
#else
00415 # define VM_ASSERT_EMT(pVM) \
    AssertMsg(VM_IS_EMT(pVM), \
        ("Not emulation thread! Thread=%RTnthrd ThreadEMT=%RTnthrd\n", RTThreadNativeSelf(), VMR3GetVMCPUNativeThread(pVM)))
#endif

/** @def VM_ASSERT_EMT_RETURN
 * Asserts that the current thread IS the emulation thread (EMT) and returns if it isn't.
 */
#ifdef IN_RC
# define VM_ASSERT_EMT_RETURN(pVM, rc)      AssertReturn(VM_IS_EMT(pVM), (rc))
#elif defined(IN_RING0)
# define VM_ASSERT_EMT_RETURN(pVM, rc)      AssertReturn(VM_IS_EMT(pVM), (rc))
#else
00428 # define VM_ASSERT_EMT_RETURN(pVM, rc) \
    AssertMsgReturn(VM_IS_EMT(pVM), \
        ("Not emulation thread! Thread=%RTnthrd ThreadEMT=%RTnthrd\n", RTThreadNativeSelf(), VMR3GetVMCPUNativeThread(pVM)), \
        (rc))
#endif


/**
 * Asserts that the current thread is NOT the emulation thread.
 */
00438 #define VM_ASSERT_OTHER_THREAD(pVM) \
    AssertMsg(!VM_IS_EMT(pVM), ("Not other thread!!\n"))


/** @def VM_ASSERT_STATE_RETURN
 * Asserts a certain VM state.
 */
#define VM_ASSERT_STATE(pVM, _enmState) \
        AssertMsg((pVM)->enmVMState == (_enmState), \
                  ("state %s, expected %s\n", VMGetStateName(pVM->enmVMState), VMGetStateName(_enmState)))

/** @def VM_ASSERT_STATE_RETURN
 * Asserts a certain VM state and returns if it doesn't match.
 */
00452 #define VM_ASSERT_STATE_RETURN(pVM, _enmState, rc) \
        AssertMsgReturn((pVM)->enmVMState == (_enmState), \
                        ("state %s, expected %s\n", VMGetStateName(pVM->enmVMState), VMGetStateName(_enmState)), \
                        (rc))




/** This is the VM structure.
 *
 * It contains (nearly?) all the VM data which have to be available in all
 * contexts. Even if it contains all the data the idea is to use APIs not
 * to modify all the members all around the place. Therefore we make use of
 * unions to hide everything which isn't local to the current source module.
 * This means we'll have to pay a little bit of attention when adding new
 * members to structures in the unions and make sure to keep the padding sizes
 * up to date.
 *
 * Run tstVMStructSize after update!
 */
00472 typedef struct VM
{
    /** The state of the VM.
     * This field is read only to everyone except the VM and EM. */
00476     VMSTATE                     enmVMState;
    /** Forced action flags.
     * See the VM_FF_* \#defines. Updated atomically.
     */
00480     volatile uint32_t           fForcedActions;
    /** Pointer to the array of page descriptors for the VM structure allocation. */
    R3PTRTYPE(PSUPPAGE)         paVMPagesR3;
    /** Session handle. For use when calling SUPR0 APIs. */
00484     PSUPDRVSESSION              pSession;
    /** Pointer to the ring-3 VM structure. */
00486     PUVM                        pUVM;
    /** Ring-3 Host Context VM Pointer. */
    R3PTRTYPE(struct VM *)      pVMR3;
    /** Ring-0 Host Context VM Pointer. */
    R0PTRTYPE(struct VM *)      pVMR0;
    /** Raw-mode Context VM Pointer. */
    RCPTRTYPE(struct VM *)      pVMRC;

    /** The GVM VM handle. Only the GVM should modify this field. */
00495     uint32_t                    hSelf;
    /** Number of virtual CPUs. */
00497     uint32_t                    cCPUs;

    /** Size of the VM structure including the VMCPU array. */
00500     uint32_t                    cbSelf;

    /** Offset to the VMCPU array starting from beginning of this structure. */
00503     uint32_t                    offVMCPU;

    /** Reserved; alignment. */
00506     uint32_t                    u32Reserved[6];

    /** @name Public VMM Switcher APIs
     * @{ */
    /**
     * Assembly switch entry point for returning to host context.
     * This function will clean up the stack frame.
     *
     * @param   eax         The return code, register.
     * @param   Ctx         The guest core context.
     * @remark  Assume interrupts disabled.
     */
00518     RTRCPTR             pfnVMMGCGuestToHostAsmGuestCtx/*(int32_t eax, CPUMCTXCORE Ctx)*/;

    /**
     * Assembly switch entry point for returning to host context.
     *
     * This is an alternative entry point which we'll be using when the we have the
     * hypervisor context and need to save  that before going to the host.
     *
     * This is typically useful when abandoning the hypervisor because of a trap
     * and want the trap state to be saved.
     *
     * @param   eax         The return code, register.
     * @param   ecx         Pointer to the  hypervisor core context, register.
     * @remark  Assume interrupts disabled.
     */
00533     RTRCPTR             pfnVMMGCGuestToHostAsmHyperCtx/*(int32_t eax, PCPUMCTXCORE ecx)*/;

    /**
     * Assembly switch entry point for returning to host context.
     *
     * This is an alternative to the two *Ctx APIs and implies that the context has already
     * been saved, or that it's just a brief return to HC and that the caller intends to resume
     * whatever it is doing upon 'return' from this call.
     *
     * @param   eax         The return code, register.
     * @remark  Assume interrupts disabled.
     */
00545     RTRCPTR             pfnVMMGCGuestToHostAsm/*(int32_t eax)*/;
    /** @} */


    /** @name Various VM data owned by VM.
     * @{ */
    RTTHREAD            uPadding1;
    /** The native handle of ThreadEMT. Getting the native handle
     * is generally faster than getting the IPRT one (except on OS/2 :-). */
00554     RTNATIVETHREAD      uPadding2;
    /** @} */


    /** @name Various items that are frequently accessed.
     * @{ */
    /** Raw ring-3 indicator.  */
00561     bool                fRawR3Enabled;
    /** Raw ring-0 indicator. */
00563     bool                fRawR0Enabled;
    /** PATM enabled flag.
     * This is placed here for performance reasons. */
00566     bool                fPATMEnabled;
    /** CSAM enabled flag.
     * This is placed here for performance reasons. */
00569     bool                fCSAMEnabled;
    /** Hardware VM support is available and enabled.
     * This is placed here for performance reasons. */
00572     bool                fHWACCMEnabled;
    /** Hardware VM support is required and non-optional.
     * This is initialized together with the rest of the VM structure. */
00575     bool                fHwVirtExtForced;
    /** PARAV enabled flag. */
00577     bool                fPARAVEnabled;
    /** @} */


    /* padding to make gnuc put the StatQemuToGC where msc does. */
#if HC_ARCH_BITS == 32
    uint32_t            padding0;
#endif

    /** Profiling the total time from Qemu to GC. */
00587     STAMPROFILEADV      StatTotalQemuToGC;
    /** Profiling the total time from GC to Qemu. */
00589     STAMPROFILEADV      StatTotalGCToQemu;
    /** Profiling the total time spent in GC. */
00591     STAMPROFILEADV      StatTotalInGC;
    /** Profiling the total time spent not in Qemu. */
00593     STAMPROFILEADV      StatTotalInQemu;
    /** Profiling the VMMSwitcher code for going to GC. */
00595     STAMPROFILEADV      StatSwitcherToGC;
    /** Profiling the VMMSwitcher code for going to HC. */
00597     STAMPROFILEADV      StatSwitcherToHC;
    STAMPROFILEADV      StatSwitcherSaveRegs;
    STAMPROFILEADV      StatSwitcherSysEnter;
    STAMPROFILEADV      StatSwitcherDebug;
    STAMPROFILEADV      StatSwitcherCR0;
    STAMPROFILEADV      StatSwitcherCR4;
    STAMPROFILEADV      StatSwitcherJmpCR3;
    STAMPROFILEADV      StatSwitcherRstrRegs;
    STAMPROFILEADV      StatSwitcherLgdt;
    STAMPROFILEADV      StatSwitcherLidt;
    STAMPROFILEADV      StatSwitcherLldt;
    STAMPROFILEADV      StatSwitcherTSS;

/** @todo Realign everything on 64 byte boundaries to better match the
 *        cache-line size. */
    /* padding - the unions must be aligned on 32 bytes boundraries. */
00613     uint32_t            padding[HC_ARCH_BITS == 32 ? 4+8 : 6];

    /** CPUM part. */
    union
    {
#ifdef ___CPUMInternal_h
        struct CPUM s;
#endif
        char        padding[4096];      /* multiple of 32 */
    } cpum;

    /** VMM part. */
    union
    {
#ifdef ___VMMInternal_h
        struct VMM  s;
#endif
        char        padding[1600];       /* multiple of 32 */
    } vmm;

    /** PGM part. */
    union
    {
#ifdef ___PGMInternal_h
        struct PGM  s;
#endif
        char        padding[50*1024];   /* multiple of 32 */
    } pgm;

    /** HWACCM part. */
    union
    {
#ifdef ___HWACCMInternal_h
        struct HWACCM s;
#endif
        char        padding[512];       /* multiple of 32 */
    } hwaccm;

    /** TRPM part. */
    union
    {
#ifdef ___TRPMInternal_h
        struct TRPM s;
#endif
        char        padding[5344];      /* multiple of 32 */
    } trpm;

    /** SELM part. */
    union
    {
#ifdef ___SELMInternal_h
        struct SELM s;
#endif
        char        padding[544];      /* multiple of 32 */
    } selm;

    /** MM part. */
    union
    {
#ifdef ___MMInternal_h
        struct MM   s;
#endif
        char        padding[192];       /* multiple of 32 */
    } mm;

    /** CFGM part. */
    union
    {
#ifdef ___CFGMInternal_h
        struct CFGM s;
#endif
        char        padding[32];        /* multiple of 32 */
    } cfgm;

    /** PDM part. */
    union
    {
#ifdef ___PDMInternal_h
        struct PDM s;
#endif
        char        padding[1824];      /* multiple of 32 */
    } pdm;

    /** IOM part. */
    union
    {
#ifdef ___IOMInternal_h
        struct IOM s;
#endif
        char        padding[4544];      /* multiple of 32 */
    } iom;

    /** PATM part. */
    union
    {
#ifdef ___PATMInternal_h
        struct PATM s;
#endif
        char        padding[768];       /* multiple of 32 */
    } patm;

    /** CSAM part. */
    union
    {
#ifdef ___CSAMInternal_h
        struct CSAM s;
#endif
        char        padding[3328];    /* multiple of 32 */
    } csam;

    /** PARAV part. */
    union
    {
#ifdef ___PARAVInternal_h
        struct PARAV s;
#endif
        char        padding[128];
    } parav;

    /** EM part. */
    union
    {
#ifdef ___EMInternal_h
        struct EM   s;
#endif
        char        padding[1344];      /* multiple of 32 */
    } em;

    /** TM part. */
    union
    {
#ifdef ___TMInternal_h
        struct TM   s;
#endif
        char        padding[1536];      /* multiple of 32 */
    } tm;

    /** DBGF part. */
    union
    {
#ifdef ___DBGFInternal_h
        struct DBGF s;
#endif
        char        padding[2368];      /* multiple of 32 */
    } dbgf;

    /** SSM part. */
    union
    {
#ifdef ___SSMInternal_h
        struct SSM  s;
#endif
        char        padding[32];        /* multiple of 32 */
    } ssm;

    /** VM part. */
    union
    {
#ifdef ___VMInternal_h
        struct VMINT    s;
#endif
        char        padding[768];       /* multiple of 32 */
    } vm;

    /** REM part. */
    union
    {
#ifdef ___REMInternal_h
        struct REM  s;
#endif

/** @def VM_REM_SIZE
 * Must be multiple of 32 and coherent with REM_ENV_SIZE from REMInternal.h. */
#if GC_ARCH_BITS == 32
# define VM_REM_SIZE        (HC_ARCH_BITS == 32 ? 0x10800 : 0x10800)
#else
00789 # define VM_REM_SIZE        (HC_ARCH_BITS == 32 ? 0x10900 : 0x10900)
#endif
        char        padding[VM_REM_SIZE];   /* multiple of 32 */
    } rem;

    /** Padding for aligning the cpu array on a 64 byte boundrary. */
00795     uint32_t    u32Reserved2[8];

    /** VMCPU array for the configured number of virtual CPUs.
     * Must be aligned on a 64-byte boundrary.  */
00799     VMCPU       aCpus[1];
} VM;

/** Pointer to a VM. */
#ifndef ___VBox_types_h
00804 typedef struct VM *PVM;
#endif


#ifdef IN_RC
__BEGIN_DECLS

/** The VM structure.
 * This is imported from the VMMGCBuiltin module, i.e. it's a one
 * of those magic globals which we should avoid using.
 */
extern DECLIMPORT(VM)   g_VM;

__END_DECLS
#endif

/** @} */

#endif


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