VBox/VMM/PGMShw.h

	PGMShw.h revision 7ffaa1c47a862e0f3cab608bdf6834e06706d735
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/* $Id$ */
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/** @file
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * VBox - Page Manager / Monitor, Shadow Paging Template.
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync */
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/*
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync *
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * available from http://www.virtualbox.org. This file is free software;
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * you can redistribute it and/or modify it under the terms of the GNU
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * General Public License (GPL) as published by the Free Software
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync *
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync * additional information or have any questions.
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync */
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/*******************************************************************************
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync*   Defined Constants And Macros                                               *
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync*******************************************************************************/
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHWPT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef PSHWPT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHWPTE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef PSHWPTE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHWPD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef PSHWPD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHWPDE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef PSHWPDE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PDE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PD_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PD_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PTE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PT_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PT_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_TOTAL_PD_ENTRIES
652d85a9390f54d4c6eca560340bf67ac1f85c9dvboxsync#undef SHW_PDPT_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PDPT_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#undef SHW_PDPE_PG_MASK
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync#undef SHW_POOL_ROOT_IDX
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#if PGM_SHW_TYPE == PGM_TYPE_32BIT
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync# define SHWPT                  X86PT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPT                 PX86PT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPTE                 X86PTE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define PSHWPTE                PX86PTE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPD                  X86PD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPD                 PX86PD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPDE                 X86PDE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPDE                PX86PDE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PDE_PG_MASK        X86_PDE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PD_SHIFT           X86_PD_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PD_MASK            X86_PD_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_TOTAL_PD_ENTRIES   X86_PG_ENTRIES
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync# define SHW_PTE_PG_MASK        X86_PTE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PT_SHIFT           X86_PT_SHIFT
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync# define SHW_PT_MASK            X86_PT_MASK
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync# define SHW_POOL_ROOT_IDX      PGMPOOL_IDX_PD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync#elif PGM_SHW_TYPE == PGM_TYPE_EPT
9347f1987dfb760943aba5a9ef094c6066901be3vboxsync# define SHWPT                  EPTPT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPT                 PEPTPT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPTE                 EPTPTE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPTE                PEPTPTE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPD                  EPTPD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPD                 PEPTPD
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPDE                 EPTPDE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPDE                PEPTPDE
0c675b5beb524401226d72640af37108327b2621vboxsync# define SHW_PDE_PG_MASK        EPT_PDE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PD_SHIFT           EPT_PD_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PD_MASK            EPT_PD_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PTE_PG_MASK        EPT_PTE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PT_SHIFT           EPT_PT_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PT_MASK            EPT_PT_MASK
2fb42335a74fe26c4e2bccbf16f077015e42a5e1vboxsync# define SHW_PDPT_SHIFT         EPT_PDPT_SHIFT
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_PDPT_MASK          EPT_PDPT_MASK
d89d64f261b0fecda692038bc6351dedf996c563vboxsync# define SHW_PDPE_PG_MASK       EPT_PDPE_PG_MASK
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHW_TOTAL_PD_ENTRIES   (EPT_PG_AMD64_ENTRIES*EPT_PG_AMD64_PDPE_ENTRIES)
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_POOL_ROOT_IDX      PGMPOOL_IDX_NESTED_ROOT      /* do not use! exception is real mode & protected mode without paging. */
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#else
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPT                  X86PTPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define PSHWPT                 PX86PTPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHWPTE                 X86PTEPAE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define PSHWPTE                PX86PTEPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHWPD                  X86PDPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define PSHWPD                 PX86PDPAE
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# define SHWPDE                 X86PDEPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define PSHWPDE                PX86PDEPAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PDE_PG_MASK        X86_PDE_PAE_PG_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PD_SHIFT           X86_PD_PAE_SHIFT
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PD_MASK            X86_PD_PAE_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PTE_PG_MASK        X86_PTE_PAE_PG_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PT_SHIFT           X86_PT_PAE_SHIFT
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# define SHW_PT_MASK            X86_PT_PAE_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# if PGM_SHW_TYPE == PGM_TYPE_AMD64
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPT_SHIFT        X86_PDPT_SHIFT
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPT_MASK         X86_PDPT_MASK_AMD64
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPE_PG_MASK      X86_PDPE_PG_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_TOTAL_PD_ENTRIES  (X86_PG_AMD64_ENTRIES*X86_PG_AMD64_PDPE_ENTRIES)
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_POOL_ROOT_IDX     PGMPOOL_IDX_AMD64_CR3
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync# else /* 32 bits PAE mode */
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPT_SHIFT        X86_PDPT_SHIFT
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPT_MASK         X86_PDPT_MASK_PAE
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_PDPE_PG_MASK      X86_PDPE_PG_MASK
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_TOTAL_PD_ENTRIES  (X86_PG_PAE_ENTRIES*X86_PG_PAE_PDPE_ENTRIES)
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  ifdef VBOX_WITH_PGMPOOL_PAGING_ONLY
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_POOL_ROOT_IDX     PGMPOOL_IDX_PDPT
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  else
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  define SHW_POOL_ROOT_IDX     PGMPOOL_IDX_PAE_PD
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync#  endif
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync# endif
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync#endif
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/*******************************************************************************
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync*   Internal Functions                                                         *
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync*******************************************************************************/
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync__BEGIN_DECLS
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsync/* r3 */
ec21c063515d0931111f0c1f8d6f4bc8e7a6c882vboxsyncPGM_SHW_DECL(int, InitData)(PVM pVM, PPGMMODEDATA pModeData, bool fResolveGCAndR0);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsyncPGM_SHW_DECL(int, Enter)(PVM pVM);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsyncPGM_SHW_DECL(int, Relocate)(PVM pVM, RTGCPTR offDelta);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsyncPGM_SHW_DECL(int, Exit)(PVM pVM);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/* all */
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsyncPGM_SHW_DECL(int, GetPage)(PVM pVM, RTGCPTR GCPtr, uint64_t *pfFlags, PRTHCPHYS pHCPhys);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsyncPGM_SHW_DECL(int, ModifyPage)(PVM pVM, RTGCPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask);
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync__END_DECLS
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync
760446f710619a9daa6cedc7f0601f49e4ea3442vboxsync/**
 * Initializes the guest bit of the paging mode data.
 *
 * @returns VBox status code.
 * @param   pVM             The VM handle.
 * @param   fResolveGCAndR0 Indicate whether or not GC and Ring-0 symbols can be resolved now.
 *                          This is used early in the init process to avoid trouble with PDM
 *                          not being initialized yet.
 */
PGM_SHW_DECL(int, InitData)(PVM pVM, PPGMMODEDATA pModeData, bool fResolveGCAndR0)
{
    Assert(pModeData->uShwType == PGM_SHW_TYPE || pModeData->uShwType == PGM_TYPE_NESTED);

    /* Ring-3 */
    pModeData->pfnR3ShwRelocate          = PGM_SHW_NAME(Relocate);
    pModeData->pfnR3ShwExit              = PGM_SHW_NAME(Exit);
    pModeData->pfnR3ShwGetPage           = PGM_SHW_NAME(GetPage);
    pModeData->pfnR3ShwModifyPage        = PGM_SHW_NAME(ModifyPage);

    if (fResolveGCAndR0)
    {
        int rc;

#if PGM_SHW_TYPE != PGM_TYPE_AMD64 && PGM_SHW_TYPE != PGM_TYPE_NESTED && PGM_SHW_TYPE != PGM_TYPE_EPT /* No AMD64 for traditional virtualization, only VT-x and AMD-V. */
        /* GC */
        rc = PDMR3LdrGetSymbolRC(pVM, NULL,       PGM_SHW_NAME_RC_STR(GetPage),    &pModeData->pfnRCShwGetPage);
        AssertMsgRCReturn(rc, ("%s -> rc=%Rrc\n", PGM_SHW_NAME_RC_STR(GetPage),  rc), rc);
        rc = PDMR3LdrGetSymbolRC(pVM, NULL,       PGM_SHW_NAME_RC_STR(ModifyPage), &pModeData->pfnRCShwModifyPage);
        AssertMsgRCReturn(rc, ("%s -> rc=%Rrc\n", PGM_SHW_NAME_RC_STR(ModifyPage), rc), rc);
#endif /* Not AMD64 shadow paging. */

        /* Ring-0 */
        rc = PDMR3LdrGetSymbolR0(pVM, NULL,       PGM_SHW_NAME_R0_STR(GetPage),    &pModeData->pfnR0ShwGetPage);
        AssertMsgRCReturn(rc, ("%s -> rc=%Rrc\n", PGM_SHW_NAME_R0_STR(GetPage),  rc), rc);
        rc = PDMR3LdrGetSymbolR0(pVM, NULL,       PGM_SHW_NAME_R0_STR(ModifyPage), &pModeData->pfnR0ShwModifyPage);
        AssertMsgRCReturn(rc, ("%s -> rc=%Rrc\n", PGM_SHW_NAME_R0_STR(ModifyPage), rc), rc);
    }
    return VINF_SUCCESS;
}

/**
 * Enters the shadow mode.
 *
 * @returns VBox status code.
 * @param   pVM         VM handle.
 */
PGM_SHW_DECL(int, Enter)(PVM pVM)
{
#ifdef VBOX_WITH_PGMPOOL_PAGING_ONLY
# if PGM_SHW_TYPE == PGM_TYPE_NESTED || PGM_SHW_TYPE == PGM_TYPE_EPT
    RTGCPHYS     GCPhysCR3 = RT_BIT_64(63);
    PPGMPOOLPAGE pNewShwPageCR3;
    PPGMPOOL     pPool     = pVM->pgm.s.CTX_SUFF(pPool);

    Assert(HWACCMIsNestedPagingActive(pVM));
    Assert(!pVM->pgm.s.pShwPageCR3R3);

    int rc = pgmPoolAlloc(pVM, GCPhysCR3, PGMPOOLKIND_ROOT_NESTED, PGMPOOL_IDX_NESTED_ROOT, GCPhysCR3 >> PAGE_SHIFT, &pNewShwPageCR3);
    AssertFatal(rc == VINF_SUCCESS);

    /* Mark the page as locked; disallow flushing. */
    pgmPoolLockPage(pPool, pNewShwPageCR3);

    pVM->pgm.s.iShwUser      = PGMPOOL_IDX_NESTED_ROOT;
    pVM->pgm.s.iShwUserTable = GCPhysCR3 >> PAGE_SHIFT;
    pVM->pgm.s.pShwPageCR3R3 = pNewShwPageCR3;

    pVM->pgm.s.pShwPageCR3RC = MMHyperCCToRC(pVM, pVM->pgm.s.pShwPageCR3R3);
    pVM->pgm.s.pShwPageCR3R0 = MMHyperCCToR0(pVM, pVM->pgm.s.pShwPageCR3R3);

    Log(("Enter nested shadow paging mode: root %RHv phys %RHp\n", pVM->pgm.s.pShwPageCR3R3, pVM->pgm.s.CTX_SUFF(pShwPageCR3)->Core.Key));
# endif
#else
# if PGM_SHW_TYPE == PGM_TYPE_NESTED
#   ifndef VBOX_WITH_2X_4GB_ADDR_SPACE
    pVM->pgm.s.pShwRootR0 = (R0PTRTYPE(void *))pVM->pgm.s.pShwNestedRootR0;
#   else
    pVM->pgm.s.pShwRootR3 = (R3PTRTYPE(void *))pVM->pgm.s.pShwNestedRootR3;
#   endif
    pVM->pgm.s.HCPhysShwCR3 = pVM->pgm.s.HCPhysShwNestedRoot;

    CPUMSetHyperCR3(pVM, PGMGetHyperCR3(pVM));
# endif
#endif

    return VINF_SUCCESS;
}


/**
 * Relocate any GC pointers related to shadow mode paging.
 *
 * @returns VBox status code.
 * @param   pVM         The VM handle.
 * @param   offDelta    The reloation offset.
 */
PGM_SHW_DECL(int, Relocate)(PVM pVM, RTGCPTR offDelta)
{
    /* nothing special to do here - InitData does the job. */
    return VINF_SUCCESS;
}


/**
 * Exits the shadow mode.
 *
 * @returns VBox status code.
 * @param   pVM         VM handle.
 */
PGM_SHW_DECL(int, Exit)(PVM pVM)
{
#ifdef VBOX_WITH_PGMPOOL_PAGING_ONLY
# if PGM_SHW_TYPE == PGM_TYPE_NESTED || PGM_SHW_TYPE == PGM_TYPE_EPT
    if (pVM->pgm.s.CTX_SUFF(pShwPageCR3))
    {
        PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);

        Assert(pVM->pgm.s.iShwUser == PGMPOOL_IDX_NESTED_ROOT);

        /* Mark the page as unlocked; allow flushing again. */
        pgmPoolUnlockPage(pPool, pVM->pgm.s.CTX_SUFF(pShwPageCR3));

        pgmPoolFreeByPage(pPool, pVM->pgm.s.CTX_SUFF(pShwPageCR3), pVM->pgm.s.iShwUser, pVM->pgm.s.iShwUserTable);
        pVM->pgm.s.pShwPageCR3R3 = 0;
        pVM->pgm.s.pShwPageCR3R0 = 0;
        pVM->pgm.s.pShwPageCR3RC = 0;
        pVM->pgm.s.iShwUser      = 0;
        pVM->pgm.s.iShwUserTable = 0;
    }
# endif
# else
# if PGM_SHW_TYPE == PGM_TYPE_NESTED
    Assert(HWACCMIsNestedPagingActive(pVM));
    pVM->pgm.s.pShwRootR3 = 0;
#  ifndef VBOX_WITH_2X_4GB_ADDR_SPACE
    pVM->pgm.s.pShwRootR0 = 0;
#  endif
    pVM->pgm.s.HCPhysShwCR3 = 0;

    Log(("Leave nested shadow paging mode\n"));
# endif
#endif
    return VINF_SUCCESS;
}