PGMAllPool.cpp revision 2ac5f62e9b2d9777d72f7e4623c4dc9af53f9088
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/* $Id$ */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/** @file
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * PGM Shadow Page Pool.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/*
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * available from http://www.virtualbox.org. This file is free software;
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * you can redistribute it and/or modify it under the terms of the GNU
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * General Public License (GPL) as published by the Free Software
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * additional information or have any questions.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/*******************************************************************************
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync* Header Files *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync*******************************************************************************/
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#define LOG_GROUP LOG_GROUP_PGM_POOL
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/pgm.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/mm.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/em.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/cpum.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifdef IN_RC
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync# include <VBox/patm.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include "PGMInternal.h"
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/vm.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/disopcode.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/hwacc_vmx.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/log.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <VBox/err.h>
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#include <iprt/asm.h>
881b5ff6bc55e1fb0f4ef42f9782ccec79c0a138vboxsync#include <iprt/string.h>
881b5ff6bc55e1fb0f4ef42f9782ccec79c0a138vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/*******************************************************************************
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync* Internal Functions *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync*******************************************************************************/
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncRT_C_DECLS_BEGIN
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic void pgmPoolFlushAllInt(PPGMPOOL pPool);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifdef PGMPOOL_WITH_USER_TRACKING
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifdef PGMPOOL_WITH_CACHE
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifdef PGMPOOL_WITH_MONITORING
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifndef IN_RING3
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLEXPORT(int) pgmPoolAccessHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#ifdef LOG_ENABLED
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic const char *pgmPoolPoolKindToStr(uint8_t enmKind);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#if defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncstatic void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT, PCX86PTPAE pGstPT);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncint pgmPoolTrackFlushGCPhysPTsSlow(PVM pVM, PPGMPAGE pPhysPage);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncPPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVM pVM, uint16_t *piPhysExt);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncvoid pgmPoolTrackPhysExtFree(PVM pVM, uint16_t iPhysExt);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncvoid pgmPoolTrackPhysExtFreeList(PVM pVM, uint16_t iPhysExt);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncRT_C_DECLS_END
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/**
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Checks if the specified page pool kind is for a 4MB or 2MB guest page.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @returns true if it's the shadow of a 4MB or 2MB guest page, otherwise false.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @param enmKind The page kind.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLINLINE(bool) pgmPoolIsBigPage(PGMPOOLKIND enmKind)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync{
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync switch (enmKind)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync {
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync return true;
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync default:
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync return false;
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync }
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync}
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/** @def PGMPOOL_PAGE_2_LOCKED_PTR
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Maps a pool page pool into the current context and lock it (RC only).
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @returns VBox status code.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @param pVM The VM handle.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @param pPage The pool page.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @remark In RC this uses PGMGCDynMapHCPage(), so it will consume of the
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * small page window employeed by that function. Be careful.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @remark There is no need to assert on the result.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#if defined(IN_RC)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLINLINE(void *) PGMPOOL_PAGE_2_LOCKED_PTR(PVM pVM, PPGMPOOLPAGE pPage)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync{
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync void *pv = pgmPoolMapPageInlined(&pVM->pgm.s, pPage);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync /* Make sure the dynamic mapping will not be reused. */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync if (pv)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync PGMDynLockHCPage(pVM, (uint8_t *)pv);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync return pv;
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync}
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#else
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync# define PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage) PGMPOOL_PAGE_2_PTR(pVM, pPage)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync/** @def PGMPOOL_UNLOCK_PTR
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * Unlock a previously locked dynamic caching (RC only).
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @returns VBox status code.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @param pVM The VM handle.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @param pPage The pool page.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync *
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @remark In RC this uses PGMGCDynMapHCPage(), so it will consume of the
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * small page window employeed by that function. Be careful.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync * @remark There is no need to assert on the result.
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync */
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#if defined(IN_RC)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsyncDECLINLINE(void) PGMPOOL_UNLOCK_PTR(PVM pVM, void *pvPage)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync{
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync if (pvPage)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync PGMDynUnlockHCPage(pVM, (uint8_t *)pvPage);
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync}
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#else
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync# define PGMPOOL_UNLOCK_PTR(pVM, pPage) do {} while (0)
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync#endif
d1c5a03c19683c719b94496bb998fde2f2e5e622vboxsync
#ifdef PGMPOOL_WITH_MONITORING
/**
* Determin the size of a write instruction.
* @returns number of bytes written.
* @param pDis The disassembler state.
*/
static unsigned pgmPoolDisasWriteSize(PDISCPUSTATE pDis)
{
/*
* This is very crude and possibly wrong for some opcodes,
* but since it's not really supposed to be called we can
* probably live with that.
*/
return DISGetParamSize(pDis, &pDis->param1);
}
/**
* Flushes a chain of pages sharing the same access monitor.
*
* @returns VBox status code suitable for scheduling.
* @param pPool The pool.
* @param pPage A page in the chain.
*/
int pgmPoolMonitorChainFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
LogFlow(("pgmPoolMonitorChainFlush: Flush page %RGp type=%d\n", pPage->GCPhys, pPage->enmKind));
/*
* Find the list head.
*/
uint16_t idx = pPage->idx;
if (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
{
while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
{
idx = pPage->iMonitoredPrev;
Assert(idx != pPage->idx);
pPage = &pPool->aPages[idx];
}
}
/*
* Iterate the list flushing each shadow page.
*/
int rc = VINF_SUCCESS;
for (;;)
{
idx = pPage->iMonitoredNext;
Assert(idx != pPage->idx);
if (pPage->idx >= PGMPOOL_IDX_FIRST)
{
int rc2 = pgmPoolFlushPage(pPool, pPage);
AssertRC(rc2);
}
/* next */
if (idx == NIL_PGMPOOL_IDX)
break;
pPage = &pPool->aPages[idx];
}
return rc;
}
/**
* Wrapper for getting the current context pointer to the entry being modified.
*
* @returns VBox status code suitable for scheduling.
* @param pVM VM Handle.
* @param pvDst Destination address
* @param pvSrc Source guest virtual address.
* @param GCPhysSrc The source guest physical address.
* @param cb Size of data to read
*/
DECLINLINE(int) pgmPoolPhysSimpleReadGCPhys(PVM pVM, void *pvDst, CTXTYPE(RTGCPTR, RTHCPTR, RTGCPTR) pvSrc, RTGCPHYS GCPhysSrc, size_t cb)
{
#if defined(IN_RING3)
memcpy(pvDst, (RTHCPTR)((uintptr_t)pvSrc & ~(RTHCUINTPTR)(cb - 1)), cb);
return VINF_SUCCESS;
#else
/* @todo in RC we could attempt to use the virtual address, although this can cause many faults (PAE Windows XP guest). */
return PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc & ~(RTGCPHYS)(cb - 1), cb);
#endif
}
/**
* Process shadow entries before they are changed by the guest.
*
* For PT entries we will clear them. For PD entries, we'll simply check
* for mapping conflicts and set the SyncCR3 FF if found.
*
* @param pVCpu VMCPU handle
* @param pPool The pool.
* @param pPage The head page.
* @param GCPhysFault The guest physical fault address.
* @param uAddress In R0 and GC this is the guest context fault address (flat).
* In R3 this is the host context 'fault' address.
* @param pDis The disassembler state for figuring out the write size.
* This need not be specified if the caller knows we won't do cross entry accesses.
*/
void pgmPoolMonitorChainChanging(PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhysFault, CTXTYPE(RTGCPTR, RTHCPTR, RTGCPTR) pvAddress, PDISCPUSTATE pDis)
{
AssertMsg(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX, ("%#x (idx=%#x)\n", pPage->iMonitoredPrev, pPage->idx));
const unsigned off = GCPhysFault & PAGE_OFFSET_MASK;
const unsigned cbWrite = pDis ? pgmPoolDisasWriteSize(pDis) : 0;
PVM pVM = pPool->CTX_SUFF(pVM);
LogFlow(("pgmPoolMonitorChainChanging: %RGv phys=%RGp cbWrite=%d\n", (RTGCPTR)pvAddress, GCPhysFault, cbWrite));
for (;;)
{
union
{
void *pv;
PX86PT pPT;
PX86PTPAE pPTPae;
PX86PD pPD;
PX86PDPAE pPDPae;
PX86PDPT pPDPT;
PX86PML4 pPML4;
} uShw;
LogFlow(("pgmPoolMonitorChainChanging: page idx=%d phys=%RGp (next=%d) kind=%s\n", pPage->idx, pPage->GCPhys, pPage->iMonitoredNext, pgmPoolPoolKindToStr(pPage->enmKind), cbWrite));
uShw.pv = NULL;
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PTE);
LogFlow(("PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT iShw=%x\n", iShw));
if (uShw.pPT->a[iShw].n.u1Present)
{
# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
X86PTE GstPte;
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
AssertRC(rc);
Log4(("pgmPoolMonitorChainChanging 32_32: deref %016RX64 GCPhys %08RX32\n", uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage,
uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK,
GstPte.u & X86_PTE_PG_MASK);
# endif
ASMAtomicWriteSize(&uShw.pPT->a[iShw], 0);
}
break;
}
/* page/2 sized */
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
if (!((off ^ pPage->GCPhys) & (PAGE_SIZE / 2)))
{
const unsigned iShw = (off / sizeof(X86PTE)) & (X86_PG_PAE_ENTRIES - 1);
LogFlow(("PGMPOOLKIND_PAE_PT_FOR_32BIT_PT iShw=%x\n", iShw));
if (uShw.pPTPae->a[iShw].n.u1Present)
{
# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
X86PTE GstPte;
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
AssertRC(rc);
Log4(("pgmPoolMonitorChainChanging pae_32: deref %016RX64 GCPhys %08RX32\n", uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage,
uShw.pPTPae->a[iShw].u & X86_PTE_PAE_PG_MASK,
GstPte.u & X86_PTE_PG_MASK);
# endif
ASMAtomicWriteSize(&uShw.pPTPae->a[iShw], 0);
}
}
break;
}
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
{
unsigned iGst = off / sizeof(X86PDE);
unsigned iShwPdpt = iGst / 256;
unsigned iShw = (iGst % 256) * 2;
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
LogFlow(("pgmPoolMonitorChainChanging PAE for 32 bits: iGst=%x iShw=%x idx = %d page idx=%d\n", iGst, iShw, iShwPdpt, pPage->enmKind - PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD));
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
if (iShwPdpt == pPage->enmKind - (unsigned)PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD)
{
for (unsigned i = 0; i < 2; i++)
{
# ifndef IN_RING0
if ((uShw.pPDPae->a[iShw + i].u & (PGM_PDFLAGS_MAPPING | X86_PDE_P)) == (PGM_PDFLAGS_MAPPING | X86_PDE_P))
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShwPdpt=%#x iShw=%#x!\n", iShwPdpt, iShw+i));
break;
}
else
# endif /* !IN_RING0 */
if (uShw.pPDPae->a[iShw+i].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw+i, uShw.pPDPae->a[iShw+i].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw+i].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw + i);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw+i], 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 3)
&& (off & 3) + cbWrite > 4)
{
const unsigned iShw2 = iShw + 2 + i;
if (iShw2 < RT_ELEMENTS(uShw.pPDPae->a))
{
# ifndef IN_RING0
if ((uShw.pPDPae->a[iShw2].u & (PGM_PDFLAGS_MAPPING | X86_PDE_P)) == (PGM_PDFLAGS_MAPPING | X86_PDE_P))
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShwPdpt=%#x iShw2=%#x!\n", iShwPdpt, iShw2));
break;
}
else
# endif /* !IN_RING0 */
if (uShw.pPDPae->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw2);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw2].u, 0);
}
}
}
}
}
break;
}
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
{
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PTEPAE);
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
if (uShw.pPTPae->a[iShw].n.u1Present)
{
# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
X86PTEPAE GstPte;
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
AssertRC(rc);
Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", uShw.pPTPae->a[iShw].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PAE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage,
uShw.pPTPae->a[iShw].u & X86_PTE_PAE_PG_MASK,
GstPte.u & X86_PTE_PAE_PG_MASK);
# endif
ASMAtomicWriteSize(&uShw.pPTPae->a[iShw].u, 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 7)
&& (off & 7) + cbWrite > sizeof(X86PTEPAE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTEPAE);
AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPTPae->a));
if (uShw.pPTPae->a[iShw2].n.u1Present)
{
# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
X86PTEPAE GstPte;
# ifdef IN_RING3
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, (RTHCPTR)((RTHCUINTPTR)pvAddress + sizeof(GstPte)), GCPhysFault + sizeof(GstPte), sizeof(GstPte));
# else
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress + sizeof(GstPte), GCPhysFault + sizeof(GstPte), sizeof(GstPte));
# endif
AssertRC(rc);
Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", uShw.pPTPae->a[iShw2].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PAE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage,
uShw.pPTPae->a[iShw2].u & X86_PTE_PAE_PG_MASK,
GstPte.u & X86_PTE_PAE_PG_MASK);
# endif
ASMAtomicWriteSize(&uShw.pPTPae->a[iShw2].u ,0);
}
}
break;
}
case PGMPOOLKIND_32BIT_PD:
{
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PTE); // ASSUMING 32-bit guest paging!
LogFlow(("pgmPoolMonitorChainChanging: PGMPOOLKIND_32BIT_PD %x\n", iShw));
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
# ifndef IN_RING0
if (uShw.pPD->a[iShw].u & PGM_PDFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw=%#x!\n", iShw));
break;
}
# endif /* !IN_RING0 */
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
{
if (uShw.pPD->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPD->a[iShw].u));
pgmPoolFree(pVM,
uShw.pPD->a[iShw].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw);
ASMAtomicWriteSize(&uShw.pPD->a[iShw].u, 0);
}
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 3)
&& (off & 3) + cbWrite > sizeof(X86PTE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTE);
if ( iShw2 != iShw
&& iShw2 < RT_ELEMENTS(uShw.pPD->a))
{
# ifndef IN_RING0
if (uShw.pPD->a[iShw2].u & PGM_PDFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
break;
}
# endif /* !IN_RING0 */
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
{
if (uShw.pPD->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPD->a[iShw2].u));
pgmPoolFree(pVM,
uShw.pPD->a[iShw2].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw2);
ASMAtomicWriteSize(&uShw.pPD->a[iShw2].u, 0);
}
}
}
}
#if 0 /* useful when running PGMAssertCR3(), a bit too troublesome for general use (TLBs). */
if ( uShw.pPD->a[iShw].n.u1Present
&& !VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
{
LogFlow(("pgmPoolMonitorChainChanging: iShw=%#x: %RX32 -> freeing it!\n", iShw, uShw.pPD->a[iShw].u));
# ifdef IN_RC /* TLB load - we're pushing things a bit... */
ASMProbeReadByte(pvAddress);
# endif
pgmPoolFree(pVM, uShw.pPD->a[iShw].u & X86_PDE_PG_MASK, pPage->idx, iShw);
ASMAtomicWriteSize(&uShw.pPD->a[iShw].u, 0);
}
#endif
break;
}
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
{
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PDEPAE);
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
#ifndef IN_RING0
if (uShw.pPDPae->a[iShw].u & PGM_PDFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw=%#x!\n", iShw));
break;
}
#endif /* !IN_RING0 */
/*
* Causes trouble when the guest uses a PDE to refer to the whole page table level
* structure. (Invalidate here; faults later on when it tries to change the page
* table entries -> recheck; probably only applies to the RC case.)
*/
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
{
if (uShw.pPDPae->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPae->a[iShw].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw].u, 0);
}
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 7)
&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
#ifndef IN_RING0
if ( iShw2 != iShw
&& uShw.pPDPae->a[iShw2].u & PGM_PDFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
break;
}
#endif /* !IN_RING0 */
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
if (uShw.pPDPae->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw2);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw2].u, 0);
}
}
break;
}
case PGMPOOLKIND_PAE_PDPT:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
/*
* Hopefully this doesn't happen very often:
* - touching unused parts of the page
* - messing with the bits of pd pointers without changing the physical address
*/
/* PDPT roots are not page aligned; 32 byte only! */
const unsigned offPdpt = GCPhysFault - pPage->GCPhys;
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = offPdpt / sizeof(X86PDPE);
if (iShw < X86_PG_PAE_PDPE_ENTRIES) /* don't use RT_ELEMENTS(uShw.pPDPT->a), because that's for long mode only */
{
# ifndef IN_RING0
if (uShw.pPDPT->a[iShw].u & PGM_PLXFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
LogFlow(("pgmPoolMonitorChainChanging: Detected pdpt conflict at iShw=%#x!\n", iShw));
break;
}
# endif /* !IN_RING0 */
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
if (uShw.pPDPT->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPT->a[iShw].u));
pgmPoolFree(pVM,
uShw.pPDPT->a[iShw].u & X86_PDPE_PG_MASK,
pPage->idx,
iShw);
ASMAtomicWriteSize(&uShw.pPDPT->a[iShw].u, 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (offPdpt & 7)
&& (offPdpt & 7) + cbWrite > sizeof(X86PDPE))
{
const unsigned iShw2 = (offPdpt + cbWrite - 1) / sizeof(X86PDPE);
if ( iShw2 != iShw
&& iShw2 < X86_PG_PAE_PDPE_ENTRIES)
{
# ifndef IN_RING0
if (uShw.pPDPT->a[iShw2].u & PGM_PLXFLAGS_MAPPING)
{
Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
STAM_COUNTER_INC(&(pVCpu->pgm.s.StatRZGuestCR3WriteConflict));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
break;
}
# endif /* !IN_RING0 */
# ifndef IN_RING0
else
# endif /* !IN_RING0 */
if (uShw.pPDPT->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPT->a[iShw2].u));
pgmPoolFree(pVM,
uShw.pPDPT->a[iShw2].u & X86_PDPE_PG_MASK,
pPage->idx,
iShw2);
ASMAtomicWriteSize(&uShw.pPDPT->a[iShw2].u, 0);
}
}
}
}
break;
}
#ifndef IN_RC
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PDEPAE);
Assert(!(uShw.pPDPae->a[iShw].u & PGM_PDFLAGS_MAPPING));
if (uShw.pPDPae->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPae->a[iShw].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw].u, 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 7)
&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
Assert(!(uShw.pPDPae->a[iShw2].u & PGM_PDFLAGS_MAPPING));
if (uShw.pPDPae->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
pgmPoolFree(pVM,
uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
pPage->idx,
iShw2);
ASMAtomicWriteSize(&uShw.pPDPae->a[iShw2].u, 0);
}
}
break;
}
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
/*
* Hopefully this doesn't happen very often:
* - messing with the bits of pd pointers without changing the physical address
*/
if (!VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
{
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PDPE);
if (uShw.pPDPT->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPT->a[iShw].u));
pgmPoolFree(pVM, uShw.pPDPT->a[iShw].u & X86_PDPE_PG_MASK, pPage->idx, iShw);
ASMAtomicWriteSize(&uShw.pPDPT->a[iShw].u, 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 7)
&& (off & 7) + cbWrite > sizeof(X86PDPE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDPE);
if (uShw.pPDPT->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPT->a[iShw2].u));
pgmPoolFree(pVM, uShw.pPDPT->a[iShw2].u & X86_PDPE_PG_MASK, pPage->idx, iShw2);
ASMAtomicWriteSize(&uShw.pPDPT->a[iShw2].u, 0);
}
}
}
break;
}
case PGMPOOLKIND_64BIT_PML4:
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPML4));
/*
* Hopefully this doesn't happen very often:
* - messing with the bits of pd pointers without changing the physical address
*/
if (!VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
{
uShw.pv = PGMPOOL_PAGE_2_LOCKED_PTR(pVM, pPage);
const unsigned iShw = off / sizeof(X86PDPE);
if (uShw.pPML4->a[iShw].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPML4->a[iShw].u));
pgmPoolFree(pVM, uShw.pPML4->a[iShw].u & X86_PML4E_PG_MASK, pPage->idx, iShw);
ASMAtomicWriteSize(&uShw.pPML4->a[iShw].u, 0);
}
/* paranoia / a bit assumptive. */
if ( pDis
&& (off & 7)
&& (off & 7) + cbWrite > sizeof(X86PDPE))
{
const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PML4E);
if (uShw.pPML4->a[iShw2].n.u1Present)
{
LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPML4->a[iShw2].u));
pgmPoolFree(pVM, uShw.pPML4->a[iShw2].u & X86_PML4E_PG_MASK, pPage->idx, iShw2);
ASMAtomicWriteSize(&uShw.pPML4->a[iShw2].u, 0);
}
}
}
break;
}
#endif /* IN_RING0 */
default:
AssertFatalMsgFailed(("enmKind=%d\n", pPage->enmKind));
}
PGMPOOL_UNLOCK_PTR(pVM, uShw.pv);
/* next */
if (pPage->iMonitoredNext == NIL_PGMPOOL_IDX)
return;
pPage = &pPool->aPages[pPage->iMonitoredNext];
}
}
# ifndef IN_RING3
/**
* Checks if a access could be a fork operation in progress.
*
* Meaning, that the guest is setting up the parent process for Copy-On-Write.
*
* @returns true if it's likly that we're forking, otherwise false.
* @param pPool The pool.
* @param pDis The disassembled instruction.
* @param offFault The access offset.
*/
DECLINLINE(bool) pgmPoolMonitorIsForking(PPGMPOOL pPool, PDISCPUSTATE pDis, unsigned offFault)
{
/*
* i386 linux is using btr to clear X86_PTE_RW.
* The functions involved are (2.6.16 source inspection):
* clear_bit
* ptep_set_wrprotect
* copy_one_pte
* copy_pte_range
* copy_pmd_range
* copy_pud_range
* copy_page_range
* dup_mmap
* dup_mm
* copy_mm
* copy_process
* do_fork
*/
if ( pDis->pCurInstr->opcode == OP_BTR
&& !(offFault & 4)
/** @todo Validate that the bit index is X86_PTE_RW. */
)
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,Fork));
return true;
}
return false;
}
/**
* Determine whether the page is likely to have been reused.
*
* @returns true if we consider the page as being reused for a different purpose.
* @returns false if we consider it to still be a paging page.
* @param pVM VM Handle.
* @param pVCpu VMCPU Handle.
* @param pRegFrame Trap register frame.
* @param pDis The disassembly info for the faulting instruction.
* @param pvFault The fault address.
*
* @remark The REP prefix check is left to the caller because of STOSD/W.
*/
DECLINLINE(bool) pgmPoolMonitorIsReused(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pDis, RTGCPTR pvFault)
{
#ifndef IN_RC
/** @todo could make this general, faulting close to rsp should be a safe reuse heuristic. */
if ( HWACCMHasPendingIrq(pVM)
&& (pRegFrame->rsp - pvFault) < 32)
{
/* Fault caused by stack writes while trying to inject an interrupt event. */
Log(("pgmPoolMonitorIsReused: reused %RGv for interrupt stack (rsp=%RGv).\n", pvFault, pRegFrame->rsp));
return true;
}
#else
NOREF(pVM); NOREF(pvFault);
#endif
LogFlow(("Reused instr %RGv %d at %RGv param1.flags=%x param1.reg=%d\n", pRegFrame->rip, pDis->pCurInstr->opcode, pvFault, pDis->param1.flags, pDis->param1.base.reg_gen));
/* Non-supervisor mode write means it's used for something else. */
if (CPUMGetGuestCPL(pVCpu, pRegFrame) != 0)
return true;
switch (pDis->pCurInstr->opcode)
{
/* call implies the actual push of the return address faulted */
case OP_CALL:
Log4(("pgmPoolMonitorIsReused: CALL\n"));
return true;
case OP_PUSH:
Log4(("pgmPoolMonitorIsReused: PUSH\n"));
return true;
case OP_PUSHF:
Log4(("pgmPoolMonitorIsReused: PUSHF\n"));
return true;
case OP_PUSHA:
Log4(("pgmPoolMonitorIsReused: PUSHA\n"));
return true;
case OP_FXSAVE:
Log4(("pgmPoolMonitorIsReused: FXSAVE\n"));
return true;
case OP_MOVNTI: /* solaris - block_zero_no_xmm */
Log4(("pgmPoolMonitorIsReused: MOVNTI\n"));
return true;
case OP_MOVNTDQ: /* solaris - hwblkclr & hwblkpagecopy */
Log4(("pgmPoolMonitorIsReused: MOVNTDQ\n"));
return true;
case OP_MOVSWD:
case OP_STOSWD:
if ( pDis->prefix == (PREFIX_REP|PREFIX_REX)
&& pRegFrame->rcx >= 0x40
)
{
Assert(pDis->mode == CPUMODE_64BIT);
Log(("pgmPoolMonitorIsReused: OP_STOSQ\n"));
return true;
}
return false;
}
if ( ( (pDis->param1.flags & USE_REG_GEN32)
|| (pDis->param1.flags & USE_REG_GEN64))
&& (pDis->param1.base.reg_gen == USE_REG_ESP))
{
Log4(("pgmPoolMonitorIsReused: ESP\n"));
return true;
}
return false;
}
/**
* Flushes the page being accessed.
*
* @returns VBox status code suitable for scheduling.
* @param pVM The VM handle.
* @param pVCpu The VMCPU handle.
* @param pPool The pool.
* @param pPage The pool page (head).
* @param pDis The disassembly of the write instruction.
* @param pRegFrame The trap register frame.
* @param GCPhysFault The fault address as guest physical address.
* @param pvFault The fault address.
*/
static int pgmPoolAccessHandlerFlush(PVM pVM, PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault)
{
/*
* First, do the flushing.
*/
int rc = pgmPoolMonitorChainFlush(pPool, pPage);
/*
* Emulate the instruction (xp/w2k problem, requires pc/cr2/sp detection). Must do this in raw mode (!); XP boot will fail otherwise
*/
uint32_t cbWritten;
int rc2 = EMInterpretInstructionCPU(pVM, pVCpu, pDis, pRegFrame, pvFault, &cbWritten);
if (RT_SUCCESS(rc2))
pRegFrame->rip += pDis->opsize;
else if (rc2 == VERR_EM_INTERPRETER)
{
#ifdef IN_RC
if (PATMIsPatchGCAddr(pVM, (RTRCPTR)pRegFrame->eip))
{
LogFlow(("pgmPoolAccessHandlerPTWorker: Interpretation failed for patch code %04x:%RGv, ignoring.\n",
pRegFrame->cs, (RTGCPTR)pRegFrame->eip));
rc = VINF_SUCCESS;
STAM_COUNTER_INC(&pPool->StatMonitorRZIntrFailPatch2);
}
else
#endif
{
rc = VINF_EM_RAW_EMULATE_INSTR;
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,EmulateInstr));
}
}
else
rc = rc2;
/* See use in pgmPoolAccessHandlerSimple(). */
PGM_INVL_VCPU_TLBS(pVCpu);
LogFlow(("pgmPoolAccessHandlerPT: returns %Rrc (flushed)\n", rc));
return rc;
}
/**
* Handles the STOSD write accesses.
*
* @returns VBox status code suitable for scheduling.
* @param pVM The VM handle.
* @param pPool The pool.
* @param pPage The pool page (head).
* @param pDis The disassembly of the write instruction.
* @param pRegFrame The trap register frame.
* @param GCPhysFault The fault address as guest physical address.
* @param pvFault The fault address.
*/
DECLINLINE(int) pgmPoolAccessHandlerSTOSD(PVM pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault)
{
unsigned uIncrement = pDis->param1.size;
Assert(pDis->mode == CPUMODE_32BIT || pDis->mode == CPUMODE_64BIT);
Assert(pRegFrame->rcx <= 0x20);
#ifdef VBOX_STRICT
if (pDis->opmode == CPUMODE_32BIT)
Assert(uIncrement == 4);
else
Assert(uIncrement == 8);
#endif
Log3(("pgmPoolAccessHandlerSTOSD\n"));
/*
* Increment the modification counter and insert it into the list
* of modified pages the first time.
*/
if (!pPage->cModifications++)
pgmPoolMonitorModifiedInsert(pPool, pPage);
/*
* Execute REP STOSD.
*
* This ASSUMES that we're not invoked by Trap0e on in a out-of-sync
* write situation, meaning that it's safe to write here.
*/
PVMCPU pVCpu = VMMGetCpu(pPool->CTX_SUFF(pVM));
RTGCUINTPTR pu32 = (RTGCUINTPTR)pvFault;
while (pRegFrame->rcx)
{
#ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
uint32_t iPrevSubset = PGMDynMapPushAutoSubset(pVCpu);
pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, (RTGCPTR)pu32, NULL);
PGMDynMapPopAutoSubset(pVCpu, iPrevSubset);
#else
pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, (RTGCPTR)pu32, NULL);
#endif
#ifdef IN_RC
*(uint32_t *)pu32 = pRegFrame->eax;
#else
PGMPhysSimpleWriteGCPhys(pVM, GCPhysFault, &pRegFrame->rax, uIncrement);
#endif
pu32 += uIncrement;
GCPhysFault += uIncrement;
pRegFrame->rdi += uIncrement;
pRegFrame->rcx--;
}
pRegFrame->rip += pDis->opsize;
#ifdef IN_RC
/* See use in pgmPoolAccessHandlerSimple(). */
PGM_INVL_VCPU_TLBS(pVCpu);
#endif
LogFlow(("pgmPoolAccessHandlerSTOSD: returns\n"));
return VINF_SUCCESS;
}
/**
* Handles the simple write accesses.
*
* @returns VBox status code suitable for scheduling.
* @param pVM The VM handle.
* @param pVCpu The VMCPU handle.
* @param pPool The pool.
* @param pPage The pool page (head).
* @param pDis The disassembly of the write instruction.
* @param pRegFrame The trap register frame.
* @param GCPhysFault The fault address as guest physical address.
* @param pvFault The fault address.
* @param pfReused Reused state (out)
*/
DECLINLINE(int) pgmPoolAccessHandlerSimple(PVM pVM, PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault, bool *pfReused)
{
Log3(("pgmPoolAccessHandlerSimple\n"));
/*
* Increment the modification counter and insert it into the list
* of modified pages the first time.
*/
if (!pPage->cModifications++)
pgmPoolMonitorModifiedInsert(pPool, pPage);
/*
* Clear all the pages. ASSUMES that pvFault is readable.
*/
#ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
uint32_t iPrevSubset = PGMDynMapPushAutoSubset(pVCpu);
pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, pvFault, pDis);
PGMDynMapPopAutoSubset(pVCpu, iPrevSubset);
#else
pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, pvFault, pDis);
#endif
/*
* Interpret the instruction.
*/
uint32_t cb;
int rc = EMInterpretInstructionCPU(pVM, pVCpu, pDis, pRegFrame, pvFault, &cb);
if (RT_SUCCESS(rc))
pRegFrame->rip += pDis->opsize;
else if (rc == VERR_EM_INTERPRETER)
{
LogFlow(("pgmPoolAccessHandlerPTWorker: Interpretation failed for %04x:%RGv - opcode=%d\n",
pRegFrame->cs, (RTGCPTR)pRegFrame->rip, pDis->pCurInstr->opcode));
rc = VINF_EM_RAW_EMULATE_INSTR;
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,EmulateInstr));
}
#if 0 /* experimental code */
if (rc == VINF_SUCCESS)
{
switch (pPage->enmKind)
{
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
{
X86PTEPAE GstPte;
int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvFault, GCPhysFault, sizeof(GstPte));
AssertRC(rc);
/* Check the new value written by the guest. If present and with a bogus physical address, then
* it's fairly safe to assume the guest is reusing the PT.
*/
if (GstPte.n.u1Present)
{
RTHCPHYS HCPhys = -1;
int rc = PGMPhysGCPhys2HCPhys(pVM, GstPte.u & X86_PTE_PAE_PG_MASK, &HCPhys);
if (rc != VINF_SUCCESS)
{
*pfReused = true;
STAM_COUNTER_INC(&pPool->StatForceFlushReused);
}
}
break;
}
}
}
#endif
#ifdef IN_RC
/*
* Quick hack, with logging enabled we're getting stale
* code TLBs but no data TLB for EIP and crash in EMInterpretDisasOne.
* Flushing here is BAD and expensive, I think EMInterpretDisasOne will
* have to be fixed to support this. But that'll have to wait till next week.
*
* An alternative is to keep track of the changed PTEs together with the
* GCPhys from the guest PT. This may proove expensive though.
*
* At the moment, it's VITAL that it's done AFTER the instruction interpreting
* because we need the stale TLBs in some cases (XP boot). This MUST be fixed properly!
*/
PGM_INVL_VCPU_TLBS(pVCpu);
#endif
LogFlow(("pgmPoolAccessHandlerSimple: returns %Rrc cb=%d\n", rc, cb));
return rc;
}
/**
* \#PF Handler callback for PT write accesses.
*
* @returns VBox status code (appropriate for GC return).
* @param pVM VM Handle.
* @param uErrorCode CPU Error code.
* @param pRegFrame Trap register frame.
* NULL on DMA and other non CPU access.
* @param pvFault The fault address (cr2).
* @param GCPhysFault The GC physical address corresponding to pvFault.
* @param pvUser User argument.
*/
DECLEXPORT(int) pgmPoolAccessHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser)
{
STAM_PROFILE_START(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), a);
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
PVMCPU pVCpu = VMMGetCpu(pVM);
unsigned cMaxModifications;
bool fForcedFlush = false;
LogFlow(("pgmPoolAccessHandler: pvFault=%RGv pPage=%p:{.idx=%d} GCPhysFault=%RGp\n", pvFault, pPage, pPage->idx, GCPhysFault));
pgmLock(pVM);
if (PHYS_PAGE_ADDRESS(GCPhysFault) != PHYS_PAGE_ADDRESS(pPage->GCPhys))
{
/* Pool page changed while we were waiting for the lock; ignore. */
Log(("CPU%d: pgmPoolAccessHandler pgm pool page for %RGp changed (to %RGp) while waiting!\n", pVCpu->idCpu, PHYS_PAGE_ADDRESS(GCPhysFault), PHYS_PAGE_ADDRESS(pPage->GCPhys)));
STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,Handled), a);
pgmUnlock(pVM);
return VINF_SUCCESS;
}
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
if (pPage->fDirty)
{
Assert(VMCPU_FF_ISSET(pVCpu, VMCPU_FF_TLB_FLUSH));
return VINF_SUCCESS; /* SMP guest case where we were blocking on the pgm lock while the same page was being marked dirty. */
}
#endif
#if 0 /* test code defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) */
if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
{
void *pvShw = PGMPOOL_PAGE_2_LOCKED_PTR(pPool->CTX_SUFF(pVM), pPage);
void *pvGst;
int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
pgmPoolTrackCheckPTPaePae(pPool, pPage, (PX86PTPAE)pvShw, (PCX86PTPAE)pvGst);
}
#endif
/*
* Disassemble the faulting instruction.
*/
PDISCPUSTATE pDis = &pVCpu->pgm.s.DisState;
int rc = EMInterpretDisasOne(pVM, pVCpu, pRegFrame, pDis, NULL);
if (RT_UNLIKELY(rc != VINF_SUCCESS))
{
AssertMsg(rc == VERR_PAGE_NOT_PRESENT || rc == VERR_PAGE_TABLE_NOT_PRESENT, ("Unexpected rc %d\n", rc));
pgmUnlock(pVM);
return rc;
}
Assert(pPage->enmKind != PGMPOOLKIND_FREE);
/*
* We should ALWAYS have the list head as user parameter. This
* is because we use that page to record the changes.
*/
Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
#ifdef IN_RING0
/* Maximum nr of modifications depends on the page type. */
if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
cMaxModifications = 4;
else
cMaxModifications = 24;
#else
cMaxModifications = 48;
#endif
/*
* Incremental page table updates should weight more than random ones.
* (Only applies when started from offset 0)
*/
pVCpu->pgm.s.cPoolAccessHandler++;
if ( pPage->pvLastAccessHandlerRip >= pRegFrame->rip - 0x40 /* observed loops in Windows 7 x64 */
&& pPage->pvLastAccessHandlerRip < pRegFrame->rip + 0x40
&& pvFault == (pPage->pvLastAccessHandlerFault + pDis->param1.size)
&& pVCpu->pgm.s.cPoolAccessHandler == (pPage->cLastAccessHandlerCount + 1))
{
Log(("Possible page reuse cMods=%d -> %d (locked=%d type=%s)\n", pPage->cModifications, pPage->cModifications * 2, pgmPoolIsPageLocked(&pVM->pgm.s, pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
pPage->cModifications = pPage->cModifications * 2;
pPage->pvLastAccessHandlerFault = pvFault;
pPage->cLastAccessHandlerCount = pVCpu->pgm.s.cPoolAccessHandler;
if (pPage->cModifications >= cMaxModifications)
{
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FlushReinit));
fForcedFlush = true;
}
}
if (pPage->cModifications >= cMaxModifications)
Log(("Mod overflow %VGv cMods=%d (locked=%d type=%s)\n", pvFault, pPage->cModifications, pgmPoolIsPageLocked(&pVM->pgm.s, pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
/*
* Check if it's worth dealing with.
*/
bool fReused = false;
bool fNotReusedNotForking = false;
if ( ( pPage->cModifications < cMaxModifications /** @todo #define */ /** @todo need to check that it's not mapping EIP. */ /** @todo adjust this! */
|| pgmPoolIsPageLocked(&pVM->pgm.s, pPage)
)
&& !(fReused = pgmPoolMonitorIsReused(pVM, pVCpu, pRegFrame, pDis, pvFault))
&& !pgmPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
{
/*
* Simple instructions, no REP prefix.
*/
if (!(pDis->prefix & (PREFIX_REP | PREFIX_REPNE)))
{
rc = pgmPoolAccessHandlerSimple(pVM, pVCpu, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault, &fReused);
if (fReused)
goto flushPage;
/* A mov instruction to change the first page table entry will be remembered so we can detect
* full page table changes early on. This will reduce the amount of unnecessary traps we'll take.
*/
if ( rc == VINF_SUCCESS
&& pDis->pCurInstr->opcode == OP_MOV
&& (pvFault & PAGE_OFFSET_MASK) == 0)
{
pPage->pvLastAccessHandlerFault = pvFault;
pPage->cLastAccessHandlerCount = pVCpu->pgm.s.cPoolAccessHandler;
pPage->pvLastAccessHandlerRip = pRegFrame->rip;
/* Make sure we don't kick out a page too quickly. */
if (pPage->cModifications > 8)
pPage->cModifications = 2;
}
else
if (pPage->pvLastAccessHandlerFault == pvFault)
{
/* ignore the 2nd write to this page table entry. */
pPage->cLastAccessHandlerCount = pVCpu->pgm.s.cPoolAccessHandler;
}
else
{
pPage->pvLastAccessHandlerFault = 0;
pPage->pvLastAccessHandlerRip = 0;
}
STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,Handled), a);
pgmUnlock(pVM);
return rc;
}
/*
* Windows is frequently doing small memset() operations (netio test 4k+).
* We have to deal with these or we'll kill the cache and performance.
*/
if ( pDis->pCurInstr->opcode == OP_STOSWD
&& !pRegFrame->eflags.Bits.u1DF
&& pDis->opmode == pDis->mode
&& pDis->addrmode == pDis->mode)
{
bool fValidStosd = false;
if ( pDis->mode == CPUMODE_32BIT
&& pDis->prefix == PREFIX_REP
&& pRegFrame->ecx <= 0x20
&& pRegFrame->ecx * 4 <= PAGE_SIZE - ((uintptr_t)pvFault & PAGE_OFFSET_MASK)
&& !((uintptr_t)pvFault & 3)
&& (pRegFrame->eax == 0 || pRegFrame->eax == 0x80) /* the two values observed. */
)
{
fValidStosd = true;
pRegFrame->rcx &= 0xffffffff; /* paranoia */
}
else
if ( pDis->mode == CPUMODE_64BIT
&& pDis->prefix == (PREFIX_REP | PREFIX_REX)
&& pRegFrame->rcx <= 0x20
&& pRegFrame->rcx * 8 <= PAGE_SIZE - ((uintptr_t)pvFault & PAGE_OFFSET_MASK)
&& !((uintptr_t)pvFault & 7)
&& (pRegFrame->rax == 0 || pRegFrame->rax == 0x80) /* the two values observed. */
)
{
fValidStosd = true;
}
if (fValidStosd)
{
rc = pgmPoolAccessHandlerSTOSD(pVM, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault);
STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,RepStosd), a);
pgmUnlock(pVM);
return rc;
}
}
/* REP prefix, don't bother. */
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,RepPrefix));
Log4(("pgmPoolAccessHandler: eax=%#x ecx=%#x edi=%#x esi=%#x rip=%RGv opcode=%d prefix=%#x\n",
pRegFrame->eax, pRegFrame->ecx, pRegFrame->edi, pRegFrame->esi, (RTGCPTR)pRegFrame->rip, pDis->pCurInstr->opcode, pDis->prefix));
fNotReusedNotForking = true;
}
#if defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) && defined(IN_RING0)
/* E.g. Windows 7 x64 initializes page tables and touches some pages in the table during the process. This
* leads to pgm pool trashing and an excessive amount of write faults due to page monitoring.
*/
if ( pPage->cModifications >= cMaxModifications
&& !fForcedFlush
&& pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT
&& ( fNotReusedNotForking
|| ( !pgmPoolMonitorIsReused(pVM, pVCpu, pRegFrame, pDis, pvFault)
&& !pgmPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
)
)
{
Assert(!pgmPoolIsPageLocked(&pVM->pgm.s, pPage));
Assert(pPage->fDirty == false);
/* Flush any monitored duplicates as we will disable write protection. */
if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
|| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
{
PPGMPOOLPAGE pPageHead = pPage;
/* Find the monitor head. */
while (pPageHead->iMonitoredPrev != NIL_PGMPOOL_IDX)
pPageHead = &pPool->aPages[pPageHead->iMonitoredPrev];
while (pPageHead)
{
unsigned idxNext = pPageHead->iMonitoredNext;
if (pPageHead != pPage)
{
STAM_COUNTER_INC(&pPool->StatDirtyPageDupFlush);
Log(("Flush duplicate page idx=%d GCPhys=%RGp type=%s\n", pPageHead->idx, pPageHead->GCPhys, pgmPoolPoolKindToStr(pPageHead->enmKind)));
int rc2 = pgmPoolFlushPage(pPool, pPageHead);
AssertRC(rc2);
}
if (idxNext == NIL_PGMPOOL_IDX)
break;
pPageHead = &pPool->aPages[idxNext];
}
}
/* The flushing above might fail for locked pages, so double check. */
if ( pPage->iMonitoredNext == NIL_PGMPOOL_IDX
&& pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
{
pgmPoolAddDirtyPage(pVM, pPool, pPage);
/* Temporarily allow write access to the page table again. */
rc = PGMHandlerPhysicalPageTempOff(pVM, pPage->GCPhys, pPage->GCPhys);
if (rc == VINF_SUCCESS)
{
rc = PGMShwModifyPage(pVCpu, pvFault, 1, X86_PTE_RW, ~(uint64_t)X86_PTE_RW);
AssertMsg(rc == VINF_SUCCESS
/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
|| rc == VERR_PAGE_TABLE_NOT_PRESENT
|| rc == VERR_PAGE_NOT_PRESENT,
("PGMShwModifyPage -> GCPtr=%RGv rc=%d\n", pvFault, rc));
pPage->pvDirtyFault = pvFault;
STAM_PROFILE_STOP(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), a);
pgmUnlock(pVM);
return rc;
}
}
}
#endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT */
STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FlushModOverflow));
flushPage:
/*
* Not worth it, so flush it.
*
* If we considered it to be reused, don't go back to ring-3
* to emulate failed instructions since we usually cannot
* interpret then. This may be a bit risky, in which case
* the reuse detection must be fixed.
*/
rc = pgmPoolAccessHandlerFlush(pVM, pVCpu, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault);
if ( rc == VINF_EM_RAW_EMULATE_INSTR
&& fReused)
{
/* Make sure that the current instruction still has shadow page backing, otherwise we'll end up in a loop. */
if (PGMShwGetPage(pVCpu, pRegFrame->rip, NULL, NULL) == VINF_SUCCESS)
rc = VINF_SUCCESS; /* safe to restart the instruction. */
}
STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,FlushPage), a);
pgmUnlock(pVM);
return rc;
}
# endif /* !IN_RING3 */
# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
# ifdef VBOX_STRICT
/**
* Check references to guest physical memory in a PAE / PAE page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
* @param pGstPT The guest page table.
*/
static void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT, PCX86PTPAE pGstPT)
{
unsigned cErrors = 0;
int LastRc = -1; /* initialized to shut up gcc */
unsigned LastPTE = ~0U; /* initialized to shut up gcc */
RTHCPHYS LastHCPhys = NIL_RTHCPHYS; /* initialized to shut up gcc */
#ifdef VBOX_STRICT
for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
AssertMsg(!pShwPT->a[i].n.u1Present, ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, pShwPT->a[i].u, pPage->iFirstPresent));
#endif
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
{
if (pShwPT->a[i].n.u1Present)
{
RTHCPHYS HCPhys = -1;
int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
if ( rc != VINF_SUCCESS
|| (pShwPT->a[i].u & X86_PTE_PAE_PG_MASK) != HCPhys)
{
RTHCPHYS HCPhysPT = -1;
Log(("rc=%d idx=%d guest %RX64 shw=%RX64 vs %RHp\n", rc, i, pGstPT->a[i].u, pShwPT->a[i].u, HCPhys));
LastPTE = i;
LastRc = rc;
LastHCPhys = HCPhys;
cErrors++;
rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pPage->GCPhys, &HCPhysPT);
AssertRC(rc);
for (unsigned iPage = 0; iPage < pPool->cCurPages; iPage++)
{
PPGMPOOLPAGE pTempPage = &pPool->aPages[iPage];
if (pTempPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
{
PX86PTPAE pShwPT2 = (PX86PTPAE)PGMPOOL_PAGE_2_LOCKED_PTR(pPool->CTX_SUFF(pVM), pTempPage);
for (unsigned j = 0; j < RT_ELEMENTS(pShwPT->a); j++)
{
if ( pShwPT2->a[j].n.u1Present
&& pShwPT2->a[j].n.u1Write
&& ((pShwPT2->a[j].u & X86_PTE_PAE_PG_MASK) == HCPhysPT))
{
Log(("GCPhys=%RGp idx=%d %RX64 vs %RX64\n", pTempPage->GCPhys, j, pShwPT->a[j].u, pShwPT2->a[j].u));
}
}
}
}
}
}
}
AssertMsg(!cErrors, ("cErrors=%d: last rc=%d idx=%d guest %RX64 shw=%RX64 vs %RHp\n", cErrors, LastRc, LastPTE, pGstPT->a[LastPTE].u, pShwPT->a[LastPTE].u, LastHCPhys));
}
# endif /* VBOX_STRICT */
/**
* Clear references to guest physical memory in a PAE / PAE page table.
*
* @returns nr of changed PTEs
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
* @param pGstPT The guest page table.
* @param pOldGstPT The old cached guest page table.
* @param fAllowRemoval Bail out as soon as we encounter an invalid PTE
* @param pfFlush Flush reused page table (out)
*/
DECLINLINE(unsigned) pgmPoolTrackFlushPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT, PCX86PTPAE pGstPT, PCX86PTPAE pOldGstPT, bool fAllowRemoval, bool *pfFlush)
{
unsigned cChanged = 0;
#ifdef VBOX_STRICT
for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
AssertMsg(!pShwPT->a[i].n.u1Present, ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, pShwPT->a[i].u, pPage->iFirstPresent));
#endif
*pfFlush = false;
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
{
/* Check the new value written by the guest. If present and with a bogus physical address, then
* it's fairly safe to assume the guest is reusing the PT.
*/
if ( fAllowRemoval
&& pGstPT->a[i].n.u1Present)
{
if (!PGMPhysIsGCPhysValid(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
{
*pfFlush = true;
return ++cChanged;
}
}
if (pShwPT->a[i].n.u1Present)
{
/* If the old cached PTE is identical, then there's no need to flush the shadow copy. */
if ((pGstPT->a[i].u & X86_PTE_PAE_PG_MASK) == (pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
{
#ifdef VBOX_STRICT
RTHCPHYS HCPhys = -1;
int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
AssertMsg(rc == VINF_SUCCESS && (pShwPT->a[i].u & X86_PTE_PAE_PG_MASK) == HCPhys, ("rc=%d guest %RX64 old %RX64 shw=%RX64 vs %RHp\n", rc, pGstPT->a[i].u, pOldGstPT->a[i].u, pShwPT->a[i].u, HCPhys));
#endif
uint64_t uHostAttr = pShwPT->a[i].u & (X86_PTE_P | X86_PTE_US | X86_PTE_A | X86_PTE_D | X86_PTE_G | X86_PTE_PAE_NX);
bool fHostRW = !!(pShwPT->a[i].u & X86_PTE_RW);
uint64_t uGuestAttr = pGstPT->a[i].u & (X86_PTE_P | X86_PTE_US | X86_PTE_A | X86_PTE_D | X86_PTE_G | X86_PTE_PAE_NX);
bool fGuestRW = !!(pGstPT->a[i].u & X86_PTE_RW);
if ( uHostAttr == uGuestAttr
&& fHostRW <= fGuestRW)
continue;
}
cChanged++;
/* Something was changed, so flush it. */
Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX64 hint=%RX64\n",
i, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK);
ASMAtomicWriteSize(&pShwPT->a[i].u, 0);
}
}
return cChanged;
}
/**
* Flush a dirty page
*
* @param pVM VM Handle.
* @param pPool The pool.
* @param idxSlot Dirty array slot index
* @param fAllowRemoval Allow a reused page table to be removed
*/
static void pgmPoolFlushDirtyPage(PVM pVM, PPGMPOOL pPool, unsigned idxSlot, bool fAllowRemoval = false)
{
PPGMPOOLPAGE pPage;
unsigned idxPage;
Assert(idxSlot < RT_ELEMENTS(pPool->aIdxDirtyPages));
if (pPool->aIdxDirtyPages[idxSlot] == NIL_PGMPOOL_IDX)
return;
idxPage = pPool->aIdxDirtyPages[idxSlot];
AssertRelease(idxPage != NIL_PGMPOOL_IDX);
pPage = &pPool->aPages[idxPage];
Assert(pPage->idx == idxPage);
Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
AssertMsg(pPage->fDirty, ("Page %RGp (slot=%d) not marked dirty!", pPage->GCPhys, idxSlot));
Log(("Flush dirty page %RGp cMods=%d\n", pPage->GCPhys, pPage->cModifications));
/* First write protect the page again to catch all write accesses. (before checking for changes -> SMP) */
int rc = PGMHandlerPhysicalReset(pVM, pPage->GCPhys);
Assert(rc == VINF_SUCCESS);
pPage->fDirty = false;
#ifdef VBOX_STRICT
uint64_t fFlags = 0;
RTHCPHYS HCPhys;
rc = PGMShwGetPage(VMMGetCpu(pVM), pPage->pvDirtyFault, &fFlags, &HCPhys);
AssertMsg( ( rc == VINF_SUCCESS
&& (!(fFlags & X86_PTE_RW) || HCPhys != pPage->Core.Key))
/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
|| rc == VERR_PAGE_TABLE_NOT_PRESENT
|| rc == VERR_PAGE_NOT_PRESENT,
("PGMShwGetPage -> GCPtr=%RGv rc=%d flags=%RX64\n", pPage->pvDirtyFault, rc, fFlags));
#endif
/* Flush those PTEs that have changed. */
STAM_PROFILE_START(&pPool->StatTrackDeref,a);
void *pvShw = PGMPOOL_PAGE_2_LOCKED_PTR(pPool->CTX_SUFF(pVM), pPage);
void *pvGst;
bool fFlush;
rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
unsigned cChanges = pgmPoolTrackFlushPTPaePae(pPool, pPage, (PX86PTPAE)pvShw, (PCX86PTPAE)pvGst, (PCX86PTPAE)&pPool->aDirtyPages[idxSlot][0], fAllowRemoval, &fFlush);
STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
/** Note: we might want to consider keeping the dirty page active in case there were many changes. */
/* This page is likely to be modified again, so reduce the nr of modifications just a bit here. */
Assert(pPage->cModifications);
if (cChanges < 4)
pPage->cModifications = 1; /* must use > 0 here */
else
pPage->cModifications = RT_MAX(1, pPage->cModifications / 2);
STAM_COUNTER_INC(&pPool->StatResetDirtyPages);
if (pPool->cDirtyPages == RT_ELEMENTS(pPool->aIdxDirtyPages))
pPool->idxFreeDirtyPage = idxSlot;
pPool->cDirtyPages--;
pPool->aIdxDirtyPages[idxSlot] = NIL_PGMPOOL_IDX;
Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aIdxDirtyPages));
if (fFlush)
{
Assert(fAllowRemoval);
Log(("Flush reused page table!\n"));
pgmPoolFlushPage(pPool, pPage);
STAM_COUNTER_INC(&pPool->StatForceFlushReused);
}
else
Log(("Removed dirty page %RGp cMods=%d cChanges=%d\n", pPage->GCPhys, pPage->cModifications, cChanges));
}
# ifndef IN_RING3
/**
* Add a new dirty page
*
* @param pVM VM Handle.
* @param pPool The pool.
* @param pPage The page.
*/
void pgmPoolAddDirtyPage(PVM pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
unsigned idxFree;
Assert(PGMIsLocked(pVM));
AssertCompile(RT_ELEMENTS(pPool->aIdxDirtyPages) == 8 || RT_ELEMENTS(pPool->aIdxDirtyPages) == 16);
Assert(!pPage->fDirty);
idxFree = pPool->idxFreeDirtyPage;
Assert(idxFree < RT_ELEMENTS(pPool->aIdxDirtyPages));
Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
if (pPool->cDirtyPages >= RT_ELEMENTS(pPool->aIdxDirtyPages))
{
STAM_COUNTER_INC(&pPool->StatDirtyPageOverFlowFlush);
pgmPoolFlushDirtyPage(pVM, pPool, idxFree, true /* allow removal of reused page tables*/);
}
Assert(pPool->cDirtyPages < RT_ELEMENTS(pPool->aIdxDirtyPages));
AssertMsg(pPool->aIdxDirtyPages[idxFree] == NIL_PGMPOOL_IDX, ("idxFree=%d cDirtyPages=%d\n", idxFree, pPool->cDirtyPages));
Log(("Add dirty page %RGp (slot=%d)\n", pPage->GCPhys, idxFree));
/* Make a copy of the guest page table as we require valid GCPhys addresses when removing
* references to physical pages. (the HCPhys linear lookup is *extremely* expensive!)
*/
void *pvShw = PGMPOOL_PAGE_2_LOCKED_PTR(pPool->CTX_SUFF(pVM), pPage);
void *pvGst;
int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
memcpy(&pPool->aDirtyPages[idxFree][0], pvGst, PAGE_SIZE);
#ifdef VBOX_STRICT
pgmPoolTrackCheckPTPaePae(pPool, pPage, (PX86PTPAE)pvShw, (PCX86PTPAE)pvGst);
#endif
STAM_COUNTER_INC(&pPool->StatDirtyPage);
pPage->fDirty = true;
pPage->idxDirty = idxFree;
pPool->aIdxDirtyPages[idxFree] = pPage->idx;
pPool->cDirtyPages++;
pPool->idxFreeDirtyPage = (pPool->idxFreeDirtyPage + 1) & (RT_ELEMENTS(pPool->aIdxDirtyPages) - 1);
if ( pPool->cDirtyPages < RT_ELEMENTS(pPool->aIdxDirtyPages)
&& pPool->aIdxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
{
unsigned i;
for (i = 1; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
{
idxFree = (pPool->idxFreeDirtyPage + i) & (RT_ELEMENTS(pPool->aIdxDirtyPages) - 1);
if (pPool->aIdxDirtyPages[idxFree] == NIL_PGMPOOL_IDX)
{
pPool->idxFreeDirtyPage = idxFree;
break;
}
}
Assert(i != RT_ELEMENTS(pPool->aIdxDirtyPages));
}
Assert(pPool->cDirtyPages == RT_ELEMENTS(pPool->aIdxDirtyPages) || pPool->aIdxDirtyPages[pPool->idxFreeDirtyPage] == NIL_PGMPOOL_IDX);
return;
}
# endif /* !IN_RING3 */
/**
* Check if the specified page is dirty (not write monitored)
*
* @return dirty or not
* @param pVM VM Handle.
* @param GCPhys Guest physical address
*/
bool pgmPoolIsDirtyPage(PVM pVM, RTGCPHYS GCPhys)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
Assert(PGMIsLocked(pVM));
if (!pPool->cDirtyPages)
return false;
GCPhys = GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1);
for (unsigned i = 0; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
{
if (pPool->aIdxDirtyPages[i] != NIL_PGMPOOL_IDX)
{
PPGMPOOLPAGE pPage;
unsigned idxPage = pPool->aIdxDirtyPages[i];
pPage = &pPool->aPages[idxPage];
if (pPage->GCPhys == GCPhys)
return true;
}
}
return false;
}
/**
* Reset all dirty pages by reinstating page monitoring.
*
* @param pVM VM Handle.
*/
void pgmPoolResetDirtyPages(PVM pVM)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
Assert(PGMIsLocked(pVM));
Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aIdxDirtyPages));
if (!pPool->cDirtyPages)
return;
Log(("pgmPoolResetDirtyPages\n"));
for (unsigned i = 0; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
pgmPoolFlushDirtyPage(pVM, pPool, i, true /* allow removal of reused page tables*/);
pPool->idxFreeDirtyPage = 0;
if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aIdxDirtyPages)
&& pPool->aIdxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
{
unsigned i;
for (i = 1; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
{
if (pPool->aIdxDirtyPages[i] == NIL_PGMPOOL_IDX)
{
pPool->idxFreeDirtyPage = i;
break;
}
}
AssertMsg(i != RT_ELEMENTS(pPool->aIdxDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
}
Assert(pPool->aIdxDirtyPages[pPool->idxFreeDirtyPage] == NIL_PGMPOOL_IDX || pPool->cDirtyPages == RT_ELEMENTS(pPool->aIdxDirtyPages));
return;
}
/**
* Reset all dirty pages by reinstating page monitoring.
*
* @param pVM VM Handle.
* @param GCPhysPT Physical address of the page table
*/
void pgmPoolInvalidateDirtyPage(PVM pVM, RTGCPHYS GCPhysPT)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
Assert(PGMIsLocked(pVM));
Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aIdxDirtyPages));
unsigned idxDirtyPage = RT_ELEMENTS(pPool->aIdxDirtyPages);
if (!pPool->cDirtyPages)
return;
GCPhysPT = GCPhysPT & ~(RTGCPHYS)(PAGE_SIZE - 1);
for (unsigned i = 0; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
{
if (pPool->aIdxDirtyPages[i] != NIL_PGMPOOL_IDX)
{
unsigned idxPage = pPool->aIdxDirtyPages[i];
PPGMPOOLPAGE pPage = &pPool->aPages[idxPage];
if (pPage->GCPhys == GCPhysPT)
{
idxDirtyPage = i;
break;
}
}
}
if (idxDirtyPage != RT_ELEMENTS(pPool->aIdxDirtyPages))
{
pgmPoolFlushDirtyPage(pVM, pPool, idxDirtyPage, true /* allow removal of reused page tables*/);
if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aIdxDirtyPages)
&& pPool->aIdxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
{
unsigned i;
for (i = 0; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
{
if (pPool->aIdxDirtyPages[i] == NIL_PGMPOOL_IDX)
{
pPool->idxFreeDirtyPage = i;
break;
}
}
AssertMsg(i != RT_ELEMENTS(pPool->aIdxDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
}
}
}
# endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT */
#endif /* PGMPOOL_WITH_MONITORING */
#ifdef PGMPOOL_WITH_CACHE
/**
* Inserts a page into the GCPhys hash table.
*
* @param pPool The pool.
* @param pPage The page.
*/
DECLINLINE(void) pgmPoolHashInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
Log3(("pgmPoolHashInsert: %RGp\n", pPage->GCPhys));
Assert(pPage->GCPhys != NIL_RTGCPHYS); Assert(pPage->iNext == NIL_PGMPOOL_IDX);
uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
pPage->iNext = pPool->aiHash[iHash];
pPool->aiHash[iHash] = pPage->idx;
}
/**
* Removes a page from the GCPhys hash table.
*
* @param pPool The pool.
* @param pPage The page.
*/
DECLINLINE(void) pgmPoolHashRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
Log3(("pgmPoolHashRemove: %RGp\n", pPage->GCPhys));
uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
if (pPool->aiHash[iHash] == pPage->idx)
pPool->aiHash[iHash] = pPage->iNext;
else
{
uint16_t iPrev = pPool->aiHash[iHash];
for (;;)
{
const int16_t i = pPool->aPages[iPrev].iNext;
if (i == pPage->idx)
{
pPool->aPages[iPrev].iNext = pPage->iNext;
break;
}
if (i == NIL_PGMPOOL_IDX)
{
AssertReleaseMsgFailed(("GCPhys=%RGp idx=%#x\n", pPage->GCPhys, pPage->idx));
break;
}
iPrev = i;
}
}
pPage->iNext = NIL_PGMPOOL_IDX;
}
/**
* Frees up one cache page.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @param pPool The pool.
* @param iUser The user index.
*/
static int pgmPoolCacheFreeOne(PPGMPOOL pPool, uint16_t iUser)
{
#ifndef IN_RC
const PVM pVM = pPool->CTX_SUFF(pVM);
#endif
Assert(pPool->iAgeHead != pPool->iAgeTail); /* We shouldn't be here if there < 2 cached entries! */
STAM_COUNTER_INC(&pPool->StatCacheFreeUpOne);
/*
* Select one page from the tail of the age list.
*/
PPGMPOOLPAGE pPage;
for (unsigned iLoop = 0; ; iLoop++)
{
uint16_t iToFree = pPool->iAgeTail;
if (iToFree == iUser)
iToFree = pPool->aPages[iToFree].iAgePrev;
/* This is the alternative to the SyncCR3 pgmPoolCacheUsed calls.
if (pPool->aPages[iToFree].iUserHead != NIL_PGMPOOL_USER_INDEX)
{
uint16_t i = pPool->aPages[iToFree].iAgePrev;
for (unsigned j = 0; j < 10 && i != NIL_PGMPOOL_USER_INDEX; j++, i = pPool->aPages[i].iAgePrev)
{
if (pPool->aPages[iToFree].iUserHead == NIL_PGMPOOL_USER_INDEX)
continue;
iToFree = i;
break;
}
}
*/
Assert(iToFree != iUser);
AssertRelease(iToFree != NIL_PGMPOOL_IDX);
pPage = &pPool->aPages[iToFree];
/*
* Reject any attempts at flushing the currently active shadow CR3 mapping.
* Call pgmPoolCacheUsed to move the page to the head of the age list.
*/
if (!pgmPoolIsPageLocked(&pPool->CTX_SUFF(pVM)->pgm.s, pPage))
break;
LogFlow(("pgmPoolCacheFreeOne: refuse CR3 mapping\n"));
pgmPoolCacheUsed(pPool, pPage);
AssertLogRelReturn(iLoop < 8192, VERR_INTERNAL_ERROR);
}
/*
* Found a usable page, flush it and return.
*/
return pgmPoolFlushPage(pPool, pPage);
}
/**
* Checks if a kind mismatch is really a page being reused
* or if it's just normal remappings.
*
* @returns true if reused and the cached page (enmKind1) should be flushed
* @returns false if not reused.
* @param enmKind1 The kind of the cached page.
* @param enmKind2 The kind of the requested page.
*/
static bool pgmPoolCacheReusedByKind(PGMPOOLKIND enmKind1, PGMPOOLKIND enmKind2)
{
switch (enmKind1)
{
/*
* Never reuse them. There is no remapping in non-paging mode.
*/
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_32BIT_PD_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT: /* never reuse them for other types */
return false;
/*
* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
*/
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PDPT:
switch (enmKind2)
{
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
return true;
default:
return false;
}
/*
* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
*/
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
switch (enmKind2)
{
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
return true;
default:
return false;
}
/*
* These cannot be flushed, and it's common to reuse the PDs as PTs.
*/
case PGMPOOLKIND_ROOT_NESTED:
return false;
default:
AssertFatalMsgFailed(("enmKind1=%d\n", enmKind1));
}
}
/**
* Attempts to satisfy a pgmPoolAlloc request from the cache.
*
* @returns VBox status code.
* @retval VINF_PGM_CACHED_PAGE on success.
* @retval VERR_FILE_NOT_FOUND if not found.
* @param pPool The pool.
* @param GCPhys The GC physical address of the page we're gonna shadow.
* @param enmKind The kind of mapping.
* @param enmAccess Access type for the mapping (only relevant for big pages)
* @param iUser The shadow page pool index of the user table.
* @param iUserTable The index into the user table (shadowed).
* @param ppPage Where to store the pointer to the page.
*/
static int pgmPoolCacheAlloc(PPGMPOOL pPool, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, uint16_t iUser, uint32_t iUserTable, PPPGMPOOLPAGE ppPage)
{
#ifndef IN_RC
const PVM pVM = pPool->CTX_SUFF(pVM);
#endif
/*
* Look up the GCPhys in the hash.
*/
unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
Log3(("pgmPoolCacheAlloc: %RGp kind %s iUser=%x iUserTable=%x SLOT=%d\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable, i));
if (i != NIL_PGMPOOL_IDX)
{
do
{
PPGMPOOLPAGE pPage = &pPool->aPages[i];
Log4(("pgmPoolCacheAlloc: slot %d found page %RGp\n", i, pPage->GCPhys));
if (pPage->GCPhys == GCPhys)
{
if ( (PGMPOOLKIND)pPage->enmKind == enmKind
&& (PGMPOOLACCESS)pPage->enmAccess == enmAccess)
{
/* Put it at the start of the use list to make sure pgmPoolTrackAddUser
* doesn't flush it in case there are no more free use records.
*/
pgmPoolCacheUsed(pPool, pPage);
int rc = pgmPoolTrackAddUser(pPool, pPage, iUser, iUserTable);
if (RT_SUCCESS(rc))
{
Assert((PGMPOOLKIND)pPage->enmKind == enmKind);
*ppPage = pPage;
if (pPage->cModifications)
pPage->cModifications = 1; /* reset counter (can't use 0, or else it will be reinserted in the modified list) */
STAM_COUNTER_INC(&pPool->StatCacheHits);
return VINF_PGM_CACHED_PAGE;
}
return rc;
}
if ((PGMPOOLKIND)pPage->enmKind != enmKind)
{
/*
* The kind is different. In some cases we should now flush the page
* as it has been reused, but in most cases this is normal remapping
* of PDs as PT or big pages using the GCPhys field in a slightly
* different way than the other kinds.
*/
if (pgmPoolCacheReusedByKind((PGMPOOLKIND)pPage->enmKind, enmKind))
{
STAM_COUNTER_INC(&pPool->StatCacheKindMismatches);
pgmPoolFlushPage(pPool, pPage);
break;
}
}
}
/* next */
i = pPage->iNext;
} while (i != NIL_PGMPOOL_IDX);
}
Log3(("pgmPoolCacheAlloc: Missed GCPhys=%RGp enmKind=%s\n", GCPhys, pgmPoolPoolKindToStr(enmKind)));
STAM_COUNTER_INC(&pPool->StatCacheMisses);
return VERR_FILE_NOT_FOUND;
}
/**
* Inserts a page into the cache.
*
* @param pPool The pool.
* @param pPage The cached page.
* @param fCanBeCached Set if the page is fit for caching from the caller's point of view.
*/
static void pgmPoolCacheInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fCanBeCached)
{
/*
* Insert into the GCPhys hash if the page is fit for that.
*/
Assert(!pPage->fCached);
if (fCanBeCached)
{
pPage->fCached = true;
pgmPoolHashInsert(pPool, pPage);
Log3(("pgmPoolCacheInsert: Caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
STAM_COUNTER_INC(&pPool->StatCacheCacheable);
}
else
{
Log3(("pgmPoolCacheInsert: Not caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
STAM_COUNTER_INC(&pPool->StatCacheUncacheable);
}
/*
* Insert at the head of the age list.
*/
pPage->iAgePrev = NIL_PGMPOOL_IDX;
pPage->iAgeNext = pPool->iAgeHead;
if (pPool->iAgeHead != NIL_PGMPOOL_IDX)
pPool->aPages[pPool->iAgeHead].iAgePrev = pPage->idx;
else
pPool->iAgeTail = pPage->idx;
pPool->iAgeHead = pPage->idx;
}
/**
* Flushes a cached page.
*
* @param pPool The pool.
* @param pPage The cached page.
*/
static void pgmPoolCacheFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
Log3(("pgmPoolCacheFlushPage: %RGp\n", pPage->GCPhys));
/*
* Remove the page from the hash.
*/
if (pPage->fCached)
{
pPage->fCached = false;
pgmPoolHashRemove(pPool, pPage);
}
else
Assert(pPage->iNext == NIL_PGMPOOL_IDX);
/*
* Remove it from the age list.
*/
if (pPage->iAgeNext != NIL_PGMPOOL_IDX)
pPool->aPages[pPage->iAgeNext].iAgePrev = pPage->iAgePrev;
else
pPool->iAgeTail = pPage->iAgePrev;
if (pPage->iAgePrev != NIL_PGMPOOL_IDX)
pPool->aPages[pPage->iAgePrev].iAgeNext = pPage->iAgeNext;
else
pPool->iAgeHead = pPage->iAgeNext;
pPage->iAgeNext = NIL_PGMPOOL_IDX;
pPage->iAgePrev = NIL_PGMPOOL_IDX;
}
#endif /* PGMPOOL_WITH_CACHE */
#ifdef PGMPOOL_WITH_MONITORING
/**
* Looks for pages sharing the monitor.
*
* @returns Pointer to the head page.
* @returns NULL if not found.
* @param pPool The Pool
* @param pNewPage The page which is going to be monitored.
*/
static PPGMPOOLPAGE pgmPoolMonitorGetPageByGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pNewPage)
{
#ifdef PGMPOOL_WITH_CACHE
/*
* Look up the GCPhys in the hash.
*/
RTGCPHYS GCPhys = pNewPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1);
unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
if (i == NIL_PGMPOOL_IDX)
return NULL;
do
{
PPGMPOOLPAGE pPage = &pPool->aPages[i];
if ( pPage->GCPhys - GCPhys < PAGE_SIZE
&& pPage != pNewPage)
{
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PDPT:
{
/* find the head */
while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
{
Assert(pPage->iMonitoredPrev != pPage->idx);
pPage = &pPool->aPages[pPage->iMonitoredPrev];
}
return pPage;
}
/* ignore, no monitoring. */
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_32BIT_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
break;
default:
AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
}
}
/* next */
i = pPage->iNext;
} while (i != NIL_PGMPOOL_IDX);
#endif
return NULL;
}
/**
* Enabled write monitoring of a guest page.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @param pPool The pool.
* @param pPage The cached page.
*/
static int pgmPoolMonitorInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
LogFlow(("pgmPoolMonitorInsert %RGp\n", pPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1)));
/*
* Filter out the relevant kinds.
*/
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PDPT:
break;
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_ROOT_NESTED:
/* Nothing to monitor here. */
return VINF_SUCCESS;
case PGMPOOLKIND_32BIT_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
/* Nothing to monitor here. */
return VINF_SUCCESS;
#ifdef PGMPOOL_WITH_MIXED_PT_CR3
break;
#else
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
#endif
default:
AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
}
/*
* Install handler.
*/
int rc;
PPGMPOOLPAGE pPageHead = pgmPoolMonitorGetPageByGCPhys(pPool, pPage);
if (pPageHead)
{
Assert(pPageHead != pPage); Assert(pPageHead->iMonitoredNext != pPage->idx);
Assert(pPageHead->iMonitoredPrev != pPage->idx);
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
if (pPageHead->fDirty)
pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPageHead->idxDirty, false /* do not remove */);
#endif
pPage->iMonitoredPrev = pPageHead->idx;
pPage->iMonitoredNext = pPageHead->iMonitoredNext;
if (pPageHead->iMonitoredNext != NIL_PGMPOOL_IDX)
pPool->aPages[pPageHead->iMonitoredNext].iMonitoredPrev = pPage->idx;
pPageHead->iMonitoredNext = pPage->idx;
rc = VINF_SUCCESS;
}
else
{
Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX); Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
PVM pVM = pPool->CTX_SUFF(pVM);
const RTGCPHYS GCPhysPage = pPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1);
rc = PGMHandlerPhysicalRegisterEx(pVM, PGMPHYSHANDLERTYPE_PHYSICAL_WRITE,
GCPhysPage, GCPhysPage + (PAGE_SIZE - 1),
pPool->pfnAccessHandlerR3, MMHyperCCToR3(pVM, pPage),
pPool->pfnAccessHandlerR0, MMHyperCCToR0(pVM, pPage),
pPool->pfnAccessHandlerRC, MMHyperCCToRC(pVM, pPage),
pPool->pszAccessHandler);
/** @todo we should probably deal with out-of-memory conditions here, but for now increasing
* the heap size should suffice. */
AssertFatalMsgRC(rc, ("PGMHandlerPhysicalRegisterEx %RGp failed with %Rrc\n", GCPhysPage, rc));
Assert(!(VMMGetCpu(pVM)->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL) || VMCPU_FF_ISSET(VMMGetCpu(pVM), VMCPU_FF_PGM_SYNC_CR3));
}
pPage->fMonitored = true;
return rc;
}
/**
* Disables write monitoring of a guest page.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @param pPool The pool.
* @param pPage The cached page.
*/
static int pgmPoolMonitorFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
/*
* Filter out the relevant kinds.
*/
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PDPT:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
break;
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_32BIT_PD_PHYS:
/* Nothing to monitor here. */
return VINF_SUCCESS;
#ifdef PGMPOOL_WITH_MIXED_PT_CR3
break;
#endif
default:
AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
}
/*
* Remove the page from the monitored list or uninstall it if last.
*/
const PVM pVM = pPool->CTX_SUFF(pVM);
int rc;
if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
|| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
{
if (pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
{
PPGMPOOLPAGE pNewHead = &pPool->aPages[pPage->iMonitoredNext];
pNewHead->iMonitoredPrev = NIL_PGMPOOL_IDX;
rc = PGMHandlerPhysicalChangeCallbacks(pVM, pPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1),
pPool->pfnAccessHandlerR3, MMHyperCCToR3(pVM, pNewHead),
pPool->pfnAccessHandlerR0, MMHyperCCToR0(pVM, pNewHead),
pPool->pfnAccessHandlerRC, MMHyperCCToRC(pVM, pNewHead),
pPool->pszAccessHandler);
AssertFatalRCSuccess(rc);
pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
}
else
{
pPool->aPages[pPage->iMonitoredPrev].iMonitoredNext = pPage->iMonitoredNext;
if (pPage->iMonitoredNext != NIL_PGMPOOL_IDX)
{
pPool->aPages[pPage->iMonitoredNext].iMonitoredPrev = pPage->iMonitoredPrev;
pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
}
pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
rc = VINF_SUCCESS;
}
}
else
{
rc = PGMHandlerPhysicalDeregister(pVM, pPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1));
AssertFatalRC(rc);
#ifdef VBOX_STRICT
PVMCPU pVCpu = VMMGetCpu(pVM);
#endif
AssertMsg(!(pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL) || VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3),
("%#x %#x\n", pVCpu->pgm.s.fSyncFlags, pVM->fGlobalForcedActions));
}
pPage->fMonitored = false;
/*
* Remove it from the list of modified pages (if in it).
*/
pgmPoolMonitorModifiedRemove(pPool, pPage);
return rc;
}
/**
* Inserts the page into the list of modified pages.
*
* @param pPool The pool.
* @param pPage The page.
*/
void pgmPoolMonitorModifiedInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
Log3(("pgmPoolMonitorModifiedInsert: idx=%d\n", pPage->idx));
AssertMsg( pPage->iModifiedNext == NIL_PGMPOOL_IDX
&& pPage->iModifiedPrev == NIL_PGMPOOL_IDX
&& pPool->iModifiedHead != pPage->idx,
("Next=%d Prev=%d idx=%d cModifications=%d Head=%d cModifiedPages=%d\n",
pPage->iModifiedNext, pPage->iModifiedPrev, pPage->idx, pPage->cModifications,
pPool->iModifiedHead, pPool->cModifiedPages));
pPage->iModifiedNext = pPool->iModifiedHead;
if (pPool->iModifiedHead != NIL_PGMPOOL_IDX)
pPool->aPages[pPool->iModifiedHead].iModifiedPrev = pPage->idx;
pPool->iModifiedHead = pPage->idx;
pPool->cModifiedPages++;
#ifdef VBOX_WITH_STATISTICS
if (pPool->cModifiedPages > pPool->cModifiedPagesHigh)
pPool->cModifiedPagesHigh = pPool->cModifiedPages;
#endif
}
/**
* Removes the page from the list of modified pages and resets the
* moficiation counter.
*
* @param pPool The pool.
* @param pPage The page which is believed to be in the list of modified pages.
*/
static void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
Log3(("pgmPoolMonitorModifiedRemove: idx=%d cModifications=%d\n", pPage->idx, pPage->cModifications));
if (pPool->iModifiedHead == pPage->idx)
{
Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
pPool->iModifiedHead = pPage->iModifiedNext;
if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
{
pPool->aPages[pPage->iModifiedNext].iModifiedPrev = NIL_PGMPOOL_IDX;
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
}
pPool->cModifiedPages--;
}
else if (pPage->iModifiedPrev != NIL_PGMPOOL_IDX)
{
pPool->aPages[pPage->iModifiedPrev].iModifiedNext = pPage->iModifiedNext;
if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
{
pPool->aPages[pPage->iModifiedNext].iModifiedPrev = pPage->iModifiedPrev;
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
}
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
pPool->cModifiedPages--;
}
else
Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
pPage->cModifications = 0;
}
/**
* Zaps the list of modified pages, resetting their modification counters in the process.
*
* @param pVM The VM handle.
*/
static void pgmPoolMonitorModifiedClearAll(PVM pVM)
{
pgmLock(pVM);
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
LogFlow(("pgmPoolMonitorModifiedClearAll: cModifiedPages=%d\n", pPool->cModifiedPages));
unsigned cPages = 0; NOREF(cPages);
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
pgmPoolResetDirtyPages(pVM);
#endif
uint16_t idx = pPool->iModifiedHead;
pPool->iModifiedHead = NIL_PGMPOOL_IDX;
while (idx != NIL_PGMPOOL_IDX)
{
PPGMPOOLPAGE pPage = &pPool->aPages[idx];
idx = pPage->iModifiedNext;
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
pPage->cModifications = 0;
Assert(++cPages);
}
AssertMsg(cPages == pPool->cModifiedPages, ("%d != %d\n", cPages, pPool->cModifiedPages));
pPool->cModifiedPages = 0;
pgmUnlock(pVM);
}
/**
* Handle SyncCR3 pool tasks
*
* @returns VBox status code.
* @retval VINF_SUCCESS if successfully added.
* @retval VINF_PGM_SYNC_CR3 is it needs to be deferred to ring 3 (GC only)
* @param pVCpu The VMCPU handle.
* @remark Should only be used when monitoring is available, thus placed in
* the PGMPOOL_WITH_MONITORING #ifdef.
*/
int pgmPoolSyncCR3(PVMCPU pVCpu)
{
PVM pVM = pVCpu->CTX_SUFF(pVM);
LogFlow(("pgmPoolSyncCR3\n"));
/*
* When monitoring shadowed pages, we reset the modification counters on CR3 sync.
* Occasionally we will have to clear all the shadow page tables because we wanted
* to monitor a page which was mapped by too many shadowed page tables. This operation
* sometimes refered to as a 'lightweight flush'.
*/
# ifdef IN_RING3 /* Don't flush in ring-0 or raw mode, it's taking too long. */
if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
pgmR3PoolClearAll(pVM);
# else /* !IN_RING3 */
if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
{
LogFlow(("SyncCR3: PGM_SYNC_CLEAR_PGM_POOL is set -> VINF_PGM_SYNC_CR3\n"));
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */
return VINF_PGM_SYNC_CR3;
}
# endif /* !IN_RING3 */
else
pgmPoolMonitorModifiedClearAll(pVM);
return VINF_SUCCESS;
}
#endif /* PGMPOOL_WITH_MONITORING */
#ifdef PGMPOOL_WITH_USER_TRACKING
/**
* Frees up at least one user entry.
*
* @returns VBox status code.
* @retval VINF_SUCCESS if successfully added.
* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
* @param pPool The pool.
* @param iUser The user index.
*/
static int pgmPoolTrackFreeOneUser(PPGMPOOL pPool, uint16_t iUser)
{
STAM_COUNTER_INC(&pPool->StatTrackFreeUpOneUser);
#ifdef PGMPOOL_WITH_CACHE
/*
* Just free cached pages in a braindead fashion.
*/
/** @todo walk the age list backwards and free the first with usage. */
int rc = VINF_SUCCESS;
do
{
int rc2 = pgmPoolCacheFreeOne(pPool, iUser);
if (RT_FAILURE(rc2) && rc == VINF_SUCCESS)
rc = rc2;
} while (pPool->iUserFreeHead == NIL_PGMPOOL_USER_INDEX);
return rc;
#else
/*
* Lazy approach.
*/
/* @todo This path no longer works (CR3 root pages will be flushed)!! */
AssertCompileFailed();
Assert(!CPUMIsGuestInLongMode(pVM));
pgmPoolFlushAllInt(pPool);
return VERR_PGM_POOL_FLUSHED;
#endif
}
/**
* Inserts a page into the cache.
*
* This will create user node for the page, insert it into the GCPhys
* hash, and insert it into the age list.
*
* @returns VBox status code.
* @retval VINF_SUCCESS if successfully added.
* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
* @param pPool The pool.
* @param pPage The cached page.
* @param GCPhys The GC physical address of the page we're gonna shadow.
* @param iUser The user index.
* @param iUserTable The user table index.
*/
DECLINLINE(int) pgmPoolTrackInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhys, uint16_t iUser, uint32_t iUserTable)
{
int rc = VINF_SUCCESS;
PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
LogFlow(("pgmPoolTrackInsert GCPhys=%RGp iUser %x iUserTable %x\n", GCPhys, iUser, iUserTable));
#ifdef VBOX_STRICT
/*
* Check that the entry doesn't already exists.
*/
if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
{
uint16_t i = pPage->iUserHead;
do
{
Assert(i < pPool->cMaxUsers);
AssertMsg(paUsers[i].iUser != iUser || paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
i = paUsers[i].iNext;
} while (i != NIL_PGMPOOL_USER_INDEX);
}
#endif
/*
* Find free a user node.
*/
uint16_t i = pPool->iUserFreeHead;
if (i == NIL_PGMPOOL_USER_INDEX)
{
rc = pgmPoolTrackFreeOneUser(pPool, iUser);
if (RT_FAILURE(rc))
return rc;
i = pPool->iUserFreeHead;
}
/*
* Unlink the user node from the free list,
* initialize and insert it into the user list.
*/
pPool->iUserFreeHead = paUsers[i].iNext;
paUsers[i].iNext = NIL_PGMPOOL_USER_INDEX;
paUsers[i].iUser = iUser;
paUsers[i].iUserTable = iUserTable;
pPage->iUserHead = i;
/*
* Insert into cache and enable monitoring of the guest page if enabled.
*
* Until we implement caching of all levels, including the CR3 one, we'll
* have to make sure we don't try monitor & cache any recursive reuse of
* a monitored CR3 page. Because all windows versions are doing this we'll
* have to be able to do combined access monitoring, CR3 + PT and
* PD + PT (guest PAE).
*
* Update:
* We're now cooperating with the CR3 monitor if an uncachable page is found.
*/
#if defined(PGMPOOL_WITH_MONITORING) || defined(PGMPOOL_WITH_CACHE)
# ifdef PGMPOOL_WITH_MIXED_PT_CR3
const bool fCanBeMonitored = true;
# else
bool fCanBeMonitored = pPool->CTX_SUFF(pVM)->pgm.s.GCPhysGstCR3Monitored == NIL_RTGCPHYS
|| (GCPhys & X86_PTE_PAE_PG_MASK) != (pPool->CTX_SUFF(pVM)->pgm.s.GCPhysGstCR3Monitored & X86_PTE_PAE_PG_MASK)
|| pgmPoolIsBigPage((PGMPOOLKIND)pPage->enmKind);
# endif
# ifdef PGMPOOL_WITH_CACHE
pgmPoolCacheInsert(pPool, pPage, fCanBeMonitored); /* This can be expanded. */
# endif
if (fCanBeMonitored)
{
# ifdef PGMPOOL_WITH_MONITORING
rc = pgmPoolMonitorInsert(pPool, pPage);
AssertRC(rc);
}
# endif
#endif /* PGMPOOL_WITH_MONITORING */
return rc;
}
# ifdef PGMPOOL_WITH_CACHE /* (only used when the cache is enabled.) */
/**
* Adds a user reference to a page.
*
* This will move the page to the head of the
*
* @returns VBox status code.
* @retval VINF_SUCCESS if successfully added.
* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
* @param pPool The pool.
* @param pPage The cached page.
* @param iUser The user index.
* @param iUserTable The user table.
*/
static int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
{
PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
Log3(("pgmPoolTrackAddUser GCPhys = %RGp iUser %x iUserTable %x\n", pPage->GCPhys, iUser, iUserTable));
# ifdef VBOX_STRICT
/*
* Check that the entry doesn't already exists. We only allow multiple users of top-level paging structures (SHW_POOL_ROOT_IDX).
*/
if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
{
uint16_t i = pPage->iUserHead;
do
{
Assert(i < pPool->cMaxUsers);
AssertMsg(iUser != PGMPOOL_IDX_PD || iUser != PGMPOOL_IDX_PDPT || iUser != PGMPOOL_IDX_NESTED_ROOT || iUser != PGMPOOL_IDX_AMD64_CR3 ||
paUsers[i].iUser != iUser || paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
i = paUsers[i].iNext;
} while (i != NIL_PGMPOOL_USER_INDEX);
}
# endif
/*
* Allocate a user node.
*/
uint16_t i = pPool->iUserFreeHead;
if (i == NIL_PGMPOOL_USER_INDEX)
{
int rc = pgmPoolTrackFreeOneUser(pPool, iUser);
if (RT_FAILURE(rc))
return rc;
i = pPool->iUserFreeHead;
}
pPool->iUserFreeHead = paUsers[i].iNext;
/*
* Initialize the user node and insert it.
*/
paUsers[i].iNext = pPage->iUserHead;
paUsers[i].iUser = iUser;
paUsers[i].iUserTable = iUserTable;
pPage->iUserHead = i;
# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
if (pPage->fDirty)
pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPage->idxDirty, false /* do not remove */);
# endif
# ifdef PGMPOOL_WITH_CACHE
/*
* Tell the cache to update its replacement stats for this page.
*/
pgmPoolCacheUsed(pPool, pPage);
# endif
return VINF_SUCCESS;
}
# endif /* PGMPOOL_WITH_CACHE */
/**
* Frees a user record associated with a page.
*
* This does not clear the entry in the user table, it simply replaces the
* user record to the chain of free records.
*
* @param pPool The pool.
* @param HCPhys The HC physical address of the shadow page.
* @param iUser The shadow page pool index of the user table.
* @param iUserTable The index into the user table (shadowed).
*/
static void pgmPoolTrackFreeUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
{
/*
* Unlink and free the specified user entry.
*/
PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
Log3(("pgmPoolTrackFreeUser %RGp %x %x\n", pPage->GCPhys, iUser, iUserTable));
/* Special: For PAE and 32-bit paging, there is usually no more than one user. */
uint16_t i = pPage->iUserHead;
if ( i != NIL_PGMPOOL_USER_INDEX
&& paUsers[i].iUser == iUser
&& paUsers[i].iUserTable == iUserTable)
{
pPage->iUserHead = paUsers[i].iNext;
paUsers[i].iUser = NIL_PGMPOOL_IDX;
paUsers[i].iNext = pPool->iUserFreeHead;
pPool->iUserFreeHead = i;
return;
}
/* General: Linear search. */
uint16_t iPrev = NIL_PGMPOOL_USER_INDEX;
while (i != NIL_PGMPOOL_USER_INDEX)
{
if ( paUsers[i].iUser == iUser
&& paUsers[i].iUserTable == iUserTable)
{
if (iPrev != NIL_PGMPOOL_USER_INDEX)
paUsers[iPrev].iNext = paUsers[i].iNext;
else
pPage->iUserHead = paUsers[i].iNext;
paUsers[i].iUser = NIL_PGMPOOL_IDX;
paUsers[i].iNext = pPool->iUserFreeHead;
pPool->iUserFreeHead = i;
return;
}
iPrev = i;
i = paUsers[i].iNext;
}
/* Fatal: didn't find it */
AssertFatalMsgFailed(("Didn't find the user entry! iUser=%#x iUserTable=%#x GCPhys=%RGp\n",
iUser, iUserTable, pPage->GCPhys));
}
/**
* Gets the entry size of a shadow table.
*
* @param enmKind The kind of page.
*
* @returns The size of the entry in bytes. That is, 4 or 8.
* @returns If the kind is not for a table, an assertion is raised and 0 is
* returned.
*/
DECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind)
{
switch (enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_32BIT_PD_PHYS:
return 4;
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_PAE_PDPT:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
return 8;
default:
AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
}
}
/**
* Gets the entry size of a guest table.
*
* @param enmKind The kind of page.
*
* @returns The size of the entry in bytes. That is, 0, 4 or 8.
* @returns If the kind is not for a table, an assertion is raised and 0 is
* returned.
*/
DECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind)
{
switch (enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
return 4;
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_PAE_PDPT:
return 8;
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_32BIT_PD_PHYS:
/** @todo can we return 0? (nobody is calling this...) */
AssertFailed();
return 0;
default:
AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
}
}
#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
/**
* Scans one shadow page table for mappings of a physical page.
*
* @returns true/false indicating removal of all relevant PTEs
* @param pVM The VM handle.
* @param pPhysPage The guest page in question.
* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
* @param iShw The shadow page table.
* @param cRefs The number of references made in that PT.
* @param pfKeptPTEs Flag indicating removal of all relevant PTEs (out)
*/
static bool pgmPoolTrackFlushGCPhysPTInt(PVM pVM, PCPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw, uint16_t cRefs)
{
LogFlow(("pgmPoolTrackFlushGCPhysPT: pPhysPage=%RHp iShw=%d cRefs=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw, cRefs));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
bool bRet = false;
/*
* Assert sanity.
*/
Assert(cRefs == 1);
AssertFatalMsg(iShw < pPool->cCurPages && iShw != NIL_PGMPOOL_IDX, ("iShw=%d\n", iShw));
PPGMPOOLPAGE pPage = &pPool->aPages[iShw];
/*
* Then, clear the actual mappings to the page in the shadow PT.
*/
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
{
const uint32_t u32 = PGM_PAGE_GET_HCPHYS(pPhysPage) | X86_PTE_P;
PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
uint32_t u32AndMask, u32OrMask;
u32AndMask = 0;
u32OrMask = 0;
if (!fFlushPTEs)
{
switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
{
case PGM_PAGE_HNDL_PHYS_STATE_NONE: /** No handler installed. */
case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /** Monitoring is temporarily disabled. */
u32OrMask = X86_PTE_RW;
u32AndMask = UINT32_MAX;
bRet = true;
STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
break;
case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /** Write access is monitored. */
u32OrMask = 0;
u32AndMask = ~X86_PTE_RW;
bRet = true;
STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
break;
default:
STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
break;
}
}
else
STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (X86_PTE_PG_MASK | X86_PTE_P)) == u32)
{
X86PTE Pte;
Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX32 cRefs=%#x\n", i, pPT->a[i], cRefs));
Pte.u = (pPT->a[i].u & u32AndMask) | u32OrMask;
if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
Pte.n.u1Write = 0; /* need to disallow writes when dirty bit tracking is still active. */
ASMAtomicWriteSize(&pPT->a[i].u, Pte.u);
cRefs--;
if (!cRefs)
return bRet;
}
#ifdef LOG_ENABLED
Log(("cRefs=%d iFirstPresent=%d cPresent=%d\n", cRefs, pPage->iFirstPresent, pPage->cPresent));
for (unsigned i = 0; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (X86_PTE_PG_MASK | X86_PTE_P)) == u32)
{
Log(("i=%d cRefs=%d\n", i, cRefs--));
}
#endif
AssertFatalMsgFailed(("cRefs=%d iFirstPresent=%d cPresent=%d\n", cRefs, pPage->iFirstPresent, pPage->cPresent));
break;
}
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
{
const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) | X86_PTE_P;
PX86PTPAE pPT = (PX86PTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
uint64_t u64AndMask, u64OrMask;
u64OrMask = 0;
u64AndMask = 0;
if (!fFlushPTEs)
{
switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
{
case PGM_PAGE_HNDL_PHYS_STATE_NONE: /** No handler installed. */
case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /** Monitoring is temporarily disabled. */
u64OrMask = X86_PTE_RW;
u64AndMask = UINT64_MAX;
bRet = true;
STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
break;
case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /** Write access is monitored. */
u64OrMask = 0;
u64AndMask = ~((uint64_t)X86_PTE_RW);
bRet = true;
STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
break;
default:
STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
break;
}
}
else
STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (X86_PTE_PAE_PG_MASK | X86_PTE_P)) == u64)
{
X86PTEPAE Pte;
Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX64 cRefs=%#x\n", i, pPT->a[i], cRefs));
Pte.u = (pPT->a[i].u & u64AndMask) | u64OrMask;
if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
Pte.n.u1Write = 0; /* need to disallow writes when dirty bit tracking is still active. */
ASMAtomicWriteSize(&pPT->a[i].u, Pte.u);
cRefs--;
if (!cRefs)
return bRet;
}
#ifdef LOG_ENABLED
Log(("cRefs=%d iFirstPresent=%d cPresent=%d\n", cRefs, pPage->iFirstPresent, pPage->cPresent));
for (unsigned i = 0; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (X86_PTE_PAE_PG_MASK | X86_PTE_P)) == u64)
{
Log(("i=%d cRefs=%d\n", i, cRefs--));
}
#endif
AssertFatalMsgFailed(("cRefs=%d iFirstPresent=%d cPresent=%d u64=%RX64\n", cRefs, pPage->iFirstPresent, pPage->cPresent, u64));
break;
}
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
{
const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) | X86_PTE_P;
PEPTPT pPT = (PEPTPT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (EPT_PTE_PG_MASK | X86_PTE_P)) == u64)
{
Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX64 cRefs=%#x\n", i, pPT->a[i], cRefs));
STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
pPT->a[i].u = 0;
cRefs--;
if (!cRefs)
return bRet;
}
#ifdef LOG_ENABLED
Log(("cRefs=%d iFirstPresent=%d cPresent=%d\n", cRefs, pPage->iFirstPresent, pPage->cPresent));
for (unsigned i = 0; i < RT_ELEMENTS(pPT->a); i++)
if ((pPT->a[i].u & (EPT_PTE_PG_MASK | X86_PTE_P)) == u64)
{
Log(("i=%d cRefs=%d\n", i, cRefs--));
}
#endif
AssertFatalMsgFailed(("cRefs=%d iFirstPresent=%d cPresent=%d\n", cRefs, pPage->iFirstPresent, pPage->cPresent));
break;
}
default:
AssertFatalMsgFailed(("enmKind=%d iShw=%d\n", pPage->enmKind, iShw));
}
return bRet;
}
/**
* Scans one shadow page table for mappings of a physical page.
*
* @param pVM The VM handle.
* @param pPhysPage The guest page in question.
* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
* @param iShw The shadow page table.
* @param cRefs The number of references made in that PT.
*/
static void pgmPoolTrackFlushGCPhysPT(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw, uint16_t cRefs)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
Log2(("pgmPoolTrackFlushGCPhysPT: pPhysPage=%RHp iShw=%d cRefs=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw, cRefs));
STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPT, f);
bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, iShw, cRefs);
if (!fKeptPTEs)
PGM_PAGE_SET_TRACKING(pPhysPage, 0);
STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPT, f);
}
/**
* Flushes a list of shadow page tables mapping the same physical page.
*
* @param pVM The VM handle.
* @param pPhysPage The guest page in question.
* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
* @param iPhysExt The physical cross reference extent list to flush.
*/
static void pgmPoolTrackFlushGCPhysPTs(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iPhysExt)
{
Assert(PGMIsLockOwner(pVM));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
bool fKeepList = false;
STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTs, f);
Log2(("pgmPoolTrackFlushGCPhysPTs: pPhysPage=%RHp iPhysExt\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iPhysExt));
const uint16_t iPhysExtStart = iPhysExt;
PPGMPOOLPHYSEXT pPhysExt;
do
{
Assert(iPhysExt < pPool->cMaxPhysExts);
pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
{
if (pPhysExt->aidx[i] != NIL_PGMPOOL_IDX)
{
bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, pPhysExt->aidx[i], 1);
if (!fKeptPTEs)
pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
else
fKeepList = true;
}
}
/* next */
iPhysExt = pPhysExt->iNext;
} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
if (!fKeepList)
{
/* insert the list into the free list and clear the ram range entry. */
pPhysExt->iNext = pPool->iPhysExtFreeHead;
pPool->iPhysExtFreeHead = iPhysExtStart;
PGM_PAGE_SET_TRACKING(pPhysPage, 0);
}
STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTs, f);
}
#endif /* PGMPOOL_WITH_GCPHYS_TRACKING */
/**
* Flushes all shadow page table mappings of the given guest page.
*
* This is typically called when the host page backing the guest one has been
* replaced or when the page protection was changed due to an access handler.
*
* @returns VBox status code.
* @retval VINF_SUCCESS if all references has been successfully cleared.
* @retval VINF_PGM_SYNC_CR3 if we're better off with a CR3 sync and a page
* pool cleaning. FF and sync flags are set.
*
* @param pVM The VM handle.
* @param pPhysPage The guest page in question.
* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
* @param pfFlushTLBs This is set to @a true if the shadow TLBs should be
* flushed, it is NOT touched if this isn't necessary.
* The caller MUST initialized this to @a false.
*/
int pgmPoolTrackUpdateGCPhys(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, bool *pfFlushTLBs)
{
PVMCPU pVCpu = VMMGetCpu(pVM);
pgmLock(pVM);
int rc = VINF_SUCCESS;
#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
const uint16_t u16 = PGM_PAGE_GET_TRACKING(pPhysPage);
if (u16)
{
/*
* The zero page is currently screwing up the tracking and we'll
* have to flush the whole shebang. Unless VBOX_WITH_NEW_LAZY_PAGE_ALLOC
* is defined, zero pages won't normally be mapped. Some kind of solution
* will be needed for this problem of course, but it will have to wait...
*/
if (PGM_PAGE_IS_ZERO(pPhysPage))
rc = VINF_PGM_GCPHYS_ALIASED;
else
{
# ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
/* Start a subset here because pgmPoolTrackFlushGCPhysPTsSlow and
pgmPoolTrackFlushGCPhysPTs will/may kill the pool otherwise. */
uint32_t iPrevSubset = PGMDynMapPushAutoSubset(pVCpu);
# endif
if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
pgmPoolTrackFlushGCPhysPT(pVM,
pPhysPage,
fFlushPTEs,
PGMPOOL_TD_GET_IDX(u16),
PGMPOOL_TD_GET_CREFS(u16));
else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
pgmPoolTrackFlushGCPhysPTs(pVM, pPhysPage, fFlushPTEs, PGMPOOL_TD_GET_IDX(u16));
else
rc = pgmPoolTrackFlushGCPhysPTsSlow(pVM, pPhysPage);
*pfFlushTLBs = true;
# ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
PGMDynMapPopAutoSubset(pVCpu, iPrevSubset);
# endif
}
}
#elif defined(PGMPOOL_WITH_CACHE)
if (PGM_PAGE_IS_ZERO(pPhysPage))
rc = VINF_PGM_GCPHYS_ALIASED;
else
{
# ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
/* Start a subset here because pgmPoolTrackFlushGCPhysPTsSlow kills the pool otherwise. */
uint32_t iPrevSubset = PGMDynMapPushAutoSubset(pVCpu);
# endif
rc = pgmPoolTrackFlushGCPhysPTsSlow(pVM, pPhysPage);
if (rc == VINF_SUCCESS)
*pfFlushTLBs = true;
}
# ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
PGMDynMapPopAutoSubset(pVCpu, iPrevSubset);
# endif
#else
rc = VINF_PGM_GCPHYS_ALIASED;
#endif
if (rc == VINF_PGM_GCPHYS_ALIASED)
{
pVCpu->pgm.s.fSyncFlags |= PGM_SYNC_CLEAR_PGM_POOL;
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
rc = VINF_PGM_SYNC_CR3;
}
pgmUnlock(pVM);
return rc;
}
/**
* Scans all shadow page tables for mappings of a physical page.
*
* This may be slow, but it's most likely more efficient than cleaning
* out the entire page pool / cache.
*
* @returns VBox status code.
* @retval VINF_SUCCESS if all references has been successfully cleared.
* @retval VINF_PGM_GCPHYS_ALIASED if we're better off with a CR3 sync and
* a page pool cleaning.
*
* @param pVM The VM handle.
* @param pPhysPage The guest page in question.
*/
int pgmPoolTrackFlushGCPhysPTsSlow(PVM pVM, PPGMPAGE pPhysPage)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTsSlow, s);
LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: cUsedPages=%d cPresent=%d pPhysPage=%R[pgmpage]\n",
pPool->cUsedPages, pPool->cPresent, pPhysPage));
#if 1
/*
* There is a limit to what makes sense.
*/
if (pPool->cPresent > 1024)
{
LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: giving up... (cPresent=%d)\n", pPool->cPresent));
STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
return VINF_PGM_GCPHYS_ALIASED;
}
#endif
/*
* Iterate all the pages until we've encountered all that in use.
* This is simple but not quite optimal solution.
*/
const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) | X86_PTE_P;
const uint32_t u32 = u64;
unsigned cLeft = pPool->cUsedPages;
unsigned iPage = pPool->cCurPages;
while (--iPage >= PGMPOOL_IDX_FIRST)
{
PPGMPOOLPAGE pPage = &pPool->aPages[iPage];
if (pPage->GCPhys != NIL_RTGCPHYS)
{
switch (pPage->enmKind)
{
/*
* We only care about shadow page tables.
*/
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
{
unsigned cPresent = pPage->cPresent;
PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
if (pPT->a[i].n.u1Present)
{
if ((pPT->a[i].u & (X86_PTE_PG_MASK | X86_PTE_P)) == u32)
{
//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX32\n", iPage, i, pPT->a[i]));
pPT->a[i].u = 0;
}
if (!--cPresent)
break;
}
break;
}
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
{
unsigned cPresent = pPage->cPresent;
PX86PTPAE pPT = (PX86PTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
if (pPT->a[i].n.u1Present)
{
if ((pPT->a[i].u & (X86_PTE_PAE_PG_MASK | X86_PTE_P)) == u64)
{
//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX64\n", iPage, i, pPT->a[i]));
pPT->a[i].u = 0;
}
if (!--cPresent)
break;
}
break;
}
}
if (!--cLeft)
break;
}
}
PGM_PAGE_SET_TRACKING(pPhysPage, 0);
STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
return VINF_SUCCESS;
}
/**
* Clears the user entry in a user table.
*
* This is used to remove all references to a page when flushing it.
*/
static void pgmPoolTrackClearPageUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PCPGMPOOLUSER pUser)
{
Assert(pUser->iUser != NIL_PGMPOOL_IDX);
Assert(pUser->iUser < pPool->cCurPages);
uint32_t iUserTable = pUser->iUserTable;
/*
* Map the user page.
*/
PPGMPOOLPAGE pUserPage = &pPool->aPages[pUser->iUser];
union
{
uint64_t *pau64;
uint32_t *pau32;
} u;
u.pau64 = (uint64_t *)PGMPOOL_PAGE_2_PTR(pPool->CTX_SUFF(pVM), pUserPage);
LogFlow(("pgmPoolTrackClearPageUser: clear %x in %s (%RGp) (flushing %s)\n", iUserTable, pgmPoolPoolKindToStr(pUserPage->enmKind), pUserPage->Core.Key, pgmPoolPoolKindToStr(pPage->enmKind)));
/* Safety precaution in case we change the paging for other modes too in the future. */
Assert(!pgmPoolIsPageLocked(&pPool->CTX_SUFF(pVM)->pgm.s, pPage));
#ifdef VBOX_STRICT
/*
* Some sanity checks.
*/
switch (pUserPage->enmKind)
{
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_32BIT_PD_PHYS:
Assert(iUserTable < X86_PG_ENTRIES);
break;
case PGMPOOLKIND_PAE_PDPT:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
case PGMPOOLKIND_PAE_PDPT_PHYS:
Assert(iUserTable < 4);
Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
break;
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PD_PHYS:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
break;
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
Assert(!(u.pau64[iUserTable] & PGM_PDFLAGS_MAPPING));
break;
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
break;
case PGMPOOLKIND_64BIT_PML4:
Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
/* GCPhys >> PAGE_SHIFT is the index here */
break;
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
break;
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
break;
case PGMPOOLKIND_ROOT_NESTED:
Assert(iUserTable < X86_PG_PAE_ENTRIES);
break;
default:
AssertMsgFailed(("enmKind=%d\n", pUserPage->enmKind));
break;
}
#endif /* VBOX_STRICT */
/*
* Clear the entry in the user page.
*/
switch (pUserPage->enmKind)
{
/* 32-bit entries */
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_32BIT_PD_PHYS:
ASMAtomicWriteSize(&u.pau32[iUserTable], 0);
break;
/* 64-bit entries */
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
#if defined(IN_RC)
/* In 32 bits PAE mode we *must* invalidate the TLB when changing a PDPT entry; the CPU fetches them only during cr3 load, so any
* non-present PDPT will continue to cause page faults.
*/
ASMReloadCR3();
#endif
/* no break */
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_PAE_PDPT:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
ASMAtomicWriteSize(&u.pau64[iUserTable], 0);
break;
default:
AssertFatalMsgFailed(("enmKind=%d iUser=%#x iUserTable=%#x\n", pUserPage->enmKind, pUser->iUser, pUser->iUserTable));
}
}
/**
* Clears all users of a page.
*/
static void pgmPoolTrackClearPageUsers(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
/*
* Free all the user records.
*/
LogFlow(("pgmPoolTrackClearPageUsers %RGp\n", pPage->GCPhys));
PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
uint16_t i = pPage->iUserHead;
while (i != NIL_PGMPOOL_USER_INDEX)
{
/* Clear enter in user table. */
pgmPoolTrackClearPageUser(pPool, pPage, &paUsers[i]);
/* Free it. */
const uint16_t iNext = paUsers[i].iNext;
paUsers[i].iUser = NIL_PGMPOOL_IDX;
paUsers[i].iNext = pPool->iUserFreeHead;
pPool->iUserFreeHead = i;
/* Next. */
i = iNext;
}
pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
}
#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
/**
* Allocates a new physical cross reference extent.
*
* @returns Pointer to the allocated extent on success. NULL if we're out of them.
* @param pVM The VM handle.
* @param piPhysExt Where to store the phys ext index.
*/
PPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVM pVM, uint16_t *piPhysExt)
{
Assert(PGMIsLockOwner(pVM));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
uint16_t iPhysExt = pPool->iPhysExtFreeHead;
if (iPhysExt == NIL_PGMPOOL_PHYSEXT_INDEX)
{
STAM_COUNTER_INC(&pPool->StamTrackPhysExtAllocFailures);
return NULL;
}
PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
pPool->iPhysExtFreeHead = pPhysExt->iNext;
pPhysExt->iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
*piPhysExt = iPhysExt;
return pPhysExt;
}
/**
* Frees a physical cross reference extent.
*
* @param pVM The VM handle.
* @param iPhysExt The extent to free.
*/
void pgmPoolTrackPhysExtFree(PVM pVM, uint16_t iPhysExt)
{
Assert(PGMIsLockOwner(pVM));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
Assert(iPhysExt < pPool->cMaxPhysExts);
PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
pPhysExt->iNext = pPool->iPhysExtFreeHead;
pPool->iPhysExtFreeHead = iPhysExt;
}
/**
* Frees a physical cross reference extent.
*
* @param pVM The VM handle.
* @param iPhysExt The extent to free.
*/
void pgmPoolTrackPhysExtFreeList(PVM pVM, uint16_t iPhysExt)
{
Assert(PGMIsLockOwner(pVM));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
const uint16_t iPhysExtStart = iPhysExt;
PPGMPOOLPHYSEXT pPhysExt;
do
{
Assert(iPhysExt < pPool->cMaxPhysExts);
pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
/* next */
iPhysExt = pPhysExt->iNext;
} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
pPhysExt->iNext = pPool->iPhysExtFreeHead;
pPool->iPhysExtFreeHead = iPhysExtStart;
}
/**
* Insert a reference into a list of physical cross reference extents.
*
* @returns The new tracking data for PGMPAGE.
*
* @param pVM The VM handle.
* @param iPhysExt The physical extent index of the list head.
* @param iShwPT The shadow page table index.
*
*/
static uint16_t pgmPoolTrackPhysExtInsert(PVM pVM, uint16_t iPhysExt, uint16_t iShwPT)
{
Assert(PGMIsLockOwner(pVM));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
/* special common case. */
if (paPhysExts[iPhysExt].aidx[2] == NIL_PGMPOOL_IDX)
{
paPhysExts[iPhysExt].aidx[2] = iShwPT;
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackAliasedMany);
LogFlow(("pgmPoolTrackPhysExtInsert: %d:{,,%d}\n", iPhysExt, iShwPT));
return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
}
/* general treatment. */
const uint16_t iPhysExtStart = iPhysExt;
unsigned cMax = 15;
for (;;)
{
Assert(iPhysExt < pPool->cMaxPhysExts);
for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
if (paPhysExts[iPhysExt].aidx[i] == NIL_PGMPOOL_IDX)
{
paPhysExts[iPhysExt].aidx[i] = iShwPT;
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackAliasedMany);
LogFlow(("pgmPoolTrackPhysExtInsert: %d:{%d} i=%d cMax=%d\n", iPhysExt, iShwPT, i, cMax));
return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtStart);
}
if (!--cMax)
{
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackOverflows);
pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
LogFlow(("pgmPoolTrackPhysExtInsert: overflow (1) iShwPT=%d\n", iShwPT));
return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
}
}
/* add another extent to the list. */
PPGMPOOLPHYSEXT pNew = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
if (!pNew)
{
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackOverflows);
pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
LogFlow(("pgmPoolTrackPhysExtInsert: pgmPoolTrackPhysExtAlloc failed iShwPT=%d\n", iShwPT));
return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
}
pNew->iNext = iPhysExtStart;
pNew->aidx[0] = iShwPT;
LogFlow(("pgmPoolTrackPhysExtInsert: added new extent %d:{%d}->%d\n", iPhysExt, iShwPT, iPhysExtStart));
return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
}
/**
* Add a reference to guest physical page where extents are in use.
*
* @returns The new tracking data for PGMPAGE.
*
* @param pVM The VM handle.
* @param u16 The ram range flags (top 16-bits).
* @param iShwPT The shadow page table index.
*/
uint16_t pgmPoolTrackPhysExtAddref(PVM pVM, uint16_t u16, uint16_t iShwPT)
{
pgmLock(pVM);
if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
{
/*
* Convert to extent list.
*/
Assert(PGMPOOL_TD_GET_CREFS(u16) == 1);
uint16_t iPhysExt;
PPGMPOOLPHYSEXT pPhysExt = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
if (pPhysExt)
{
LogFlow(("pgmPoolTrackPhysExtAddref: new extent: %d:{%d, %d}\n", iPhysExt, PGMPOOL_TD_GET_IDX(u16), iShwPT));
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackAliased);
pPhysExt->aidx[0] = PGMPOOL_TD_GET_IDX(u16);
pPhysExt->aidx[1] = iShwPT;
u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
}
else
u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
}
else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
{
/*
* Insert into the extent list.
*/
u16 = pgmPoolTrackPhysExtInsert(pVM, PGMPOOL_TD_GET_IDX(u16), iShwPT);
}
else
STAM_COUNTER_INC(&pVM->pgm.s.StatTrackAliasedLots);
pgmUnlock(pVM);
return u16;
}
/**
* Clear references to guest physical memory.
*
* @param pPool The pool.
* @param pPage The page.
* @param pPhysPage Pointer to the aPages entry in the ram range.
*/
void pgmPoolTrackPhysExtDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMPAGE pPhysPage)
{
const unsigned cRefs = PGM_PAGE_GET_TD_CREFS(pPhysPage);
AssertFatalMsg(cRefs == PGMPOOL_TD_CREFS_PHYSEXT, ("cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
uint16_t iPhysExt = PGM_PAGE_GET_TD_IDX(pPhysPage);
if (iPhysExt != PGMPOOL_TD_IDX_OVERFLOWED)
{
PVM pVM = pPool->CTX_SUFF(pVM);
pgmLock(pVM);
uint16_t iPhysExtPrev = NIL_PGMPOOL_PHYSEXT_INDEX;
PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
do
{
Assert(iPhysExt < pPool->cMaxPhysExts);
/*
* Look for the shadow page and check if it's all freed.
*/
for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
{
if (paPhysExts[iPhysExt].aidx[i] == pPage->idx)
{
paPhysExts[iPhysExt].aidx[i] = NIL_PGMPOOL_IDX;
for (i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
if (paPhysExts[iPhysExt].aidx[i] != NIL_PGMPOOL_IDX)
{
Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d\n", pPhysPage, pPage->idx));
pgmUnlock(pVM);
return;
}
/* we can free the node. */
const uint16_t iPhysExtNext = paPhysExts[iPhysExt].iNext;
if ( iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX
&& iPhysExtNext == NIL_PGMPOOL_PHYSEXT_INDEX)
{
/* lonely node */
pgmPoolTrackPhysExtFree(pVM, iPhysExt);
Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d lonely\n", pPhysPage, pPage->idx));
PGM_PAGE_SET_TRACKING(pPhysPage, 0);
}
else if (iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX)
{
/* head */
Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d head\n", pPhysPage, pPage->idx));
PGM_PAGE_SET_TRACKING(pPhysPage, PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtNext));
pgmPoolTrackPhysExtFree(pVM, iPhysExt);
}
else
{
/* in list */
Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d\n", pPhysPage, pPage->idx));
paPhysExts[iPhysExtPrev].iNext = iPhysExtNext;
pgmPoolTrackPhysExtFree(pVM, iPhysExt);
}
iPhysExt = iPhysExtNext;
pgmUnlock(pVM);
return;
}
}
/* next */
iPhysExtPrev = iPhysExt;
iPhysExt = paPhysExts[iPhysExt].iNext;
} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
pgmUnlock(pVM);
AssertFatalMsgFailed(("not-found! cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
}
else /* nothing to do */
Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage]\n", pPhysPage));
}
/**
* Clear references to guest physical memory.
*
* This is the same as pgmPoolTracDerefGCPhys except that the guest physical address
* is assumed to be correct, so the linear search can be skipped and we can assert
* at an earlier point.
*
* @param pPool The pool.
* @param pPage The page.
* @param HCPhys The host physical address corresponding to the guest page.
* @param GCPhys The guest physical address corresponding to HCPhys.
*/
static void pgmPoolTracDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhys)
{
/*
* Walk range list.
*/
PPGMRAMRANGE pRam = pPool->CTX_SUFF(pVM)->pgm.s.CTX_SUFF(pRamRanges);
while (pRam)
{
RTGCPHYS off = GCPhys - pRam->GCPhys;
if (off < pRam->cb)
{
/* does it match? */
const unsigned iPage = off >> PAGE_SHIFT;
Assert(PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]));
#ifdef LOG_ENABLED
RTHCPHYS HCPhysPage = PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]);
Log2(("pgmPoolTracDerefGCPhys %RHp vs %RHp\n", HCPhysPage, HCPhys));
#endif
if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
{
pgmTrackDerefGCPhys(pPool, pPage, &pRam->aPages[iPage]);
return;
}
break;
}
pRam = pRam->CTX_SUFF(pNext);
}
AssertFatalMsgFailed(("HCPhys=%RHp GCPhys=%RGp\n", HCPhys, GCPhys));
}
/**
* Clear references to guest physical memory.
*
* @param pPool The pool.
* @param pPage The page.
* @param HCPhys The host physical address corresponding to the guest page.
* @param GCPhysHint The guest physical address which may corresponding to HCPhys.
*/
void pgmPoolTracDerefGCPhysHint(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhysHint)
{
Log4(("pgmPoolTracDerefGCPhysHint %RHp %RGp\n", HCPhys, GCPhysHint));
/*
* Walk range list.
*/
PPGMRAMRANGE pRam = pPool->CTX_SUFF(pVM)->pgm.s.CTX_SUFF(pRamRanges);
while (pRam)
{
RTGCPHYS off = GCPhysHint - pRam->GCPhys;
if (off < pRam->cb)
{
/* does it match? */
const unsigned iPage = off >> PAGE_SHIFT;
Assert(PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]));
if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
{
pgmTrackDerefGCPhys(pPool, pPage, &pRam->aPages[iPage]);
return;
}
break;
}
pRam = pRam->CTX_SUFF(pNext);
}
/*
* Damn, the hint didn't work. We'll have to do an expensive linear search.
*/
STAM_COUNTER_INC(&pPool->StatTrackLinearRamSearches);
pRam = pPool->CTX_SUFF(pVM)->pgm.s.CTX_SUFF(pRamRanges);
while (pRam)
{
unsigned iPage = pRam->cb >> PAGE_SHIFT;
while (iPage-- > 0)
{
if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
{
Log4(("pgmPoolTracDerefGCPhysHint: Linear HCPhys=%RHp GCPhysHint=%RGp GCPhysReal=%RGp\n",
HCPhys, GCPhysHint, pRam->GCPhys + (iPage << PAGE_SHIFT)));
pgmTrackDerefGCPhys(pPool, pPage, &pRam->aPages[iPage]);
return;
}
}
pRam = pRam->CTX_SUFF(pNext);
}
AssertFatalMsgFailed(("HCPhys=%RHp GCPhysHint=%RGp\n", HCPhys, GCPhysHint));
}
/**
* Clear references to guest physical memory in a 32-bit / 32-bit page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
* @param pGstPT The guest page table.
*/
DECLINLINE(void) pgmPoolTrackDerefPT32Bit32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT, PCX86PT pGstPT)
{
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPT32Bit32Bit: i=%d pte=%RX32 hint=%RX32\n",
i, pShwPT->a[i].u & X86_PTE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage, pShwPT->a[i].u & X86_PTE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK);
if (!--pPage->cPresent)
break;
}
}
/**
* Clear references to guest physical memory in a PAE / 32-bit page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
* @param pGstPT The guest page table (just a half one).
*/
DECLINLINE(void) pgmPoolTrackDerefPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT, PCX86PT pGstPT)
{
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPTPae32Bit: i=%d pte=%RX64 hint=%RX32\n",
i, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK);
if (!--pPage->cPresent)
break;
}
}
/**
* Clear references to guest physical memory in a PAE / PAE page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
* @param pGstPT The guest page table.
*/
DECLINLINE(void) pgmPoolTrackDerefPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT, PCX86PTPAE pGstPT)
{
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX32 hint=%RX32\n",
i, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
pgmPoolTracDerefGCPhysHint(pPool, pPage, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, pGstPT->a[i].u & X86_PTE_PAE_PG_MASK);
if (!--pPage->cPresent)
break;
}
}
/**
* Clear references to guest physical memory in a 32-bit / 4MB page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPT32Bit4MB(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT)
{
RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPT32Bit4MB: i=%d pte=%RX32 GCPhys=%RGp\n",
i, pShwPT->a[i].u & X86_PTE_PG_MASK, GCPhys));
pgmPoolTracDerefGCPhys(pPool, pPage, pShwPT->a[i].u & X86_PTE_PG_MASK, GCPhys);
if (!--pPage->cPresent)
break;
}
}
/**
* Clear references to guest physical memory in a PAE / 2/4MB page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPT The shadow page table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPTPaeBig(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PTPAE pShwPT)
{
RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPTPaeBig: i=%d pte=%RX64 hint=%RGp\n",
i, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, GCPhys));
pgmPoolTracDerefGCPhys(pPool, pPage, pShwPT->a[i].u & X86_PTE_PAE_PG_MASK, GCPhys);
if (!--pPage->cPresent)
break;
}
}
/**
* Clear references to shadowed pages in an EPT page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPML4 The shadow page directory pointer table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPT pShwPT)
{
RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
if (pShwPT->a[i].n.u1Present)
{
Log4(("pgmPoolTrackDerefPTEPT: i=%d pte=%RX64 GCPhys=%RX64\n",
i, pShwPT->a[i].u & EPT_PTE_PG_MASK, pPage->GCPhys));
pgmPoolTracDerefGCPhys(pPool, pPage, pShwPT->a[i].u & EPT_PTE_PG_MASK, GCPhys);
if (!--pPage->cPresent)
break;
}
}
#endif /* PGMPOOL_WITH_GCPHYS_TRACKING */
/**
* Clear references to shadowed pages in a 32 bits page directory.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPD The shadow page directory (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPD(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PD pShwPD)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
{
if ( pShwPD->a[i].n.u1Present
&& !(pShwPD->a[i].u & PGM_PDFLAGS_MAPPING)
)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & X86_PDE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%x\n", pShwPD->a[i].u & X86_PDE_PG_MASK));
}
}
}
/**
* Clear references to shadowed pages in a PAE (legacy or 64 bits) page directory.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPD The shadow page directory (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPDPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPAE pShwPD)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
{
if ( pShwPD->a[i].n.u1Present
&& !(pShwPD->a[i].u & PGM_PDFLAGS_MAPPING)
)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & X86_PDE_PAE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPD->a[i].u & X86_PDE_PAE_PG_MASK));
/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
}
}
}
/**
* Clear references to shadowed pages in a PAE page directory pointer table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPDPTPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
{
for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++)
{
if ( pShwPDPT->a[i].n.u1Present
&& !(pShwPDPT->a[i].u & PGM_PLXFLAGS_MAPPING)
)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & X86_PDPE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & X86_PDPE_PG_MASK));
}
}
}
/**
* Clear references to shadowed pages in a 64-bit page directory pointer table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPDPT64Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
{
Assert(!(pShwPDPT->a[i].u & PGM_PLXFLAGS_MAPPING));
if (pShwPDPT->a[i].n.u1Present)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & X86_PDPE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & X86_PDPE_PG_MASK));
/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
}
}
}
/**
* Clear references to shadowed pages in a 64-bit level 4 page table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPML4 The shadow page directory pointer table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPML464Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PML4 pShwPML4)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPML4->a); i++)
{
if (pShwPML4->a[i].n.u1Present)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPML4->a[i].u & X86_PDPE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPML4->a[i].u & X86_PML4E_PG_MASK));
/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
}
}
}
/**
* Clear references to shadowed pages in an EPT page directory.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPD The shadow page directory (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPDEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPD pShwPD)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
{
if (pShwPD->a[i].n.u1Present)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & EPT_PDE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPD->a[i].u & EPT_PDE_PG_MASK));
/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
}
}
}
/**
* Clear references to shadowed pages in an EPT page directory pointer table.
*
* @param pPool The pool.
* @param pPage The page.
* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
*/
DECLINLINE(void) pgmPoolTrackDerefPDPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPDPT pShwPDPT)
{
for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
{
if (pShwPDPT->a[i].n.u1Present)
{
PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & EPT_PDPTE_PG_MASK);
if (pSubPage)
pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
else
AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & EPT_PDPTE_PG_MASK));
/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
}
}
}
/**
* Clears all references made by this page.
*
* This includes other shadow pages and GC physical addresses.
*
* @param pPool The pool.
* @param pPage The page.
*/
static void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
{
/*
* Map the shadow page and take action according to the page kind.
*/
void *pvShw = PGMPOOL_PAGE_2_LOCKED_PTR(pPool->CTX_SUFF(pVM), pPage);
switch (pPage->enmKind)
{
#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
{
STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
void *pvGst;
int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
pgmPoolTrackDerefPT32Bit32Bit(pPool, pPage, (PX86PT)pvShw, (PCX86PT)pvGst);
STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
break;
}
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
{
STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
void *pvGst;
int rc = PGM_GCPHYS_2_PTR_EX(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
pgmPoolTrackDerefPTPae32Bit(pPool, pPage, (PX86PTPAE)pvShw, (PCX86PT)pvGst);
STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
break;
}
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
{
STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
void *pvGst;
int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
pgmPoolTrackDerefPTPaePae(pPool, pPage, (PX86PTPAE)pvShw, (PCX86PTPAE)pvGst);
STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
break;
}
case PGMPOOLKIND_32BIT_PT_FOR_PHYS: /* treat it like a 4 MB page */
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
{
STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
pgmPoolTrackDerefPT32Bit4MB(pPool, pPage, (PX86PT)pvShw);
STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
break;
}
case PGMPOOLKIND_PAE_PT_FOR_PHYS: /* treat it like a 2 MB page */
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
{
STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
pgmPoolTrackDerefPTPaeBig(pPool, pPage, (PX86PTPAE)pvShw);
STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
break;
}
#else /* !PGMPOOL_WITH_GCPHYS_TRACKING */
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
break;
#endif /* !PGMPOOL_WITH_GCPHYS_TRACKING */
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
pgmPoolTrackDerefPDPae(pPool, pPage, (PX86PDPAE)pvShw);
break;
case PGMPOOLKIND_32BIT_PD_PHYS:
case PGMPOOLKIND_32BIT_PD:
pgmPoolTrackDerefPD(pPool, pPage, (PX86PD)pvShw);
break;
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
case PGMPOOLKIND_PAE_PDPT:
case PGMPOOLKIND_PAE_PDPT_PHYS:
pgmPoolTrackDerefPDPTPae(pPool, pPage, (PX86PDPT)pvShw);
break;
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
pgmPoolTrackDerefPDPT64Bit(pPool, pPage, (PX86PDPT)pvShw);
break;
case PGMPOOLKIND_64BIT_PML4:
pgmPoolTrackDerefPML464Bit(pPool, pPage, (PX86PML4)pvShw);
break;
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
pgmPoolTrackDerefPTEPT(pPool, pPage, (PEPTPT)pvShw);
break;
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
pgmPoolTrackDerefPDEPT(pPool, pPage, (PEPTPD)pvShw);
break;
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
pgmPoolTrackDerefPDPTEPT(pPool, pPage, (PEPTPDPT)pvShw);
break;
default:
AssertFatalMsgFailed(("enmKind=%d\n", pPage->enmKind));
}
/* paranoia, clear the shadow page. Remove this laser (i.e. let Alloc and ClearAll do it). */
STAM_PROFILE_START(&pPool->StatZeroPage, z);
ASMMemZeroPage(pvShw);
STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
pPage->fZeroed = true;
PGMPOOL_UNLOCK_PTR(pPool->CTX_SUFF(pVM), pvShw);
}
#endif /* PGMPOOL_WITH_USER_TRACKING */
/**
* Flushes a pool page.
*
* This moves the page to the free list after removing all user references to it.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @param pPool The pool.
* @param HCPhys The HC physical address of the shadow page.
* @param fFlush Flush the TLBS when required (should only be false in very specific use cases!!)
*/
int pgmPoolFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fFlush)
{
PVM pVM = pPool->CTX_SUFF(pVM);
bool fFlushRequired = false;
int rc = VINF_SUCCESS;
STAM_PROFILE_START(&pPool->StatFlushPage, f);
LogFlow(("pgmPoolFlushPage: pPage=%p:{.Key=%RHp, .idx=%d, .enmKind=%s, .GCPhys=%RGp}\n",
pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
/*
* Quietly reject any attempts at flushing any of the special root pages.
*/
if (pPage->idx < PGMPOOL_IDX_FIRST)
{
AssertFailed(); /* can no longer happen */
Log(("pgmPoolFlushPage: special root page, rejected. enmKind=%s idx=%d\n", pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx));
return VINF_SUCCESS;
}
pgmLock(pVM);
/*
* Quietly reject any attempts at flushing the currently active shadow CR3 mapping
*/
if (pgmPoolIsPageLocked(&pVM->pgm.s, pPage))
{
AssertMsg( pPage->enmKind == PGMPOOLKIND_64BIT_PML4
|| pPage->enmKind == PGMPOOLKIND_PAE_PDPT
|| pPage->enmKind == PGMPOOLKIND_PAE_PDPT_FOR_32BIT
|| pPage->enmKind == PGMPOOLKIND_32BIT_PD
|| pPage->enmKind == PGMPOOLKIND_PAE_PD_FOR_PAE_PD
|| pPage->enmKind == PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD
|| pPage->enmKind == PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD
|| pPage->enmKind == PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD
|| pPage->enmKind == PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD,
("Can't free the shadow CR3! (%RHp vs %RHp kind=%d\n", PGMGetHyperCR3(VMMGetCpu(pVM)), pPage->Core.Key, pPage->enmKind));
Log(("pgmPoolFlushPage: current active shadow CR3, rejected. enmKind=%s idx=%d\n", pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx));
pgmUnlock(pVM);
return VINF_SUCCESS;
}
#ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
/* Start a subset so we won't run out of mapping space. */
PVMCPU pVCpu = VMMGetCpu(pVM);
uint32_t iPrevSubset = PGMDynMapPushAutoSubset(pVCpu);
#endif
/*
* Mark the page as being in need of an ASMMemZeroPage().
*/
pPage->fZeroed = false;
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
if (pPage->fDirty)
pgmPoolFlushDirtyPage(pVM, pPool, pPage->idxDirty, false /* do not remove */);
#endif
#ifdef PGMPOOL_WITH_USER_TRACKING
/* If there are any users of this table, then we *must* issue a tlb flush on all VCPUs. */
if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
fFlushRequired = true;
/*
* Clear the page.
*/
pgmPoolTrackClearPageUsers(pPool, pPage);
STAM_PROFILE_START(&pPool->StatTrackDeref,a);
pgmPoolTrackDeref(pPool, pPage);
STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
#endif
#ifdef PGMPOOL_WITH_CACHE
/*
* Flush it from the cache.
*/
pgmPoolCacheFlushPage(pPool, pPage);
#endif /* PGMPOOL_WITH_CACHE */
#ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
/* Heavy stuff done. */
PGMDynMapPopAutoSubset(pVCpu, iPrevSubset);
#endif
#ifdef PGMPOOL_WITH_MONITORING
/*
* Deregistering the monitoring.
*/
if (pPage->fMonitored)
rc = pgmPoolMonitorFlush(pPool, pPage);
#endif
/*
* Free the page.
*/
Assert(pPage->iNext == NIL_PGMPOOL_IDX);
pPage->iNext = pPool->iFreeHead;
pPool->iFreeHead = pPage->idx;
pPage->enmKind = PGMPOOLKIND_FREE;
pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
pPage->GCPhys = NIL_RTGCPHYS;
pPage->fReusedFlushPending = false;
pPool->cUsedPages--;
/* Flush the TLBs of all VCPUs if required. */
if ( fFlushRequired
&& fFlush)
{
PGM_INVL_ALL_VCPU_TLBS();
}
pgmUnlock(pVM);
STAM_PROFILE_STOP(&pPool->StatFlushPage, f);
return rc;
}
/**
* Frees a usage of a pool page.
*
* The caller is responsible to updating the user table so that it no longer
* references the shadow page.
*
* @param pPool The pool.
* @param HCPhys The HC physical address of the shadow page.
* @param iUser The shadow page pool index of the user table.
* @param iUserTable The index into the user table (shadowed).
*/
void pgmPoolFreeByPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
{
PVM pVM = pPool->CTX_SUFF(pVM);
STAM_PROFILE_START(&pPool->StatFree, a);
LogFlow(("pgmPoolFreeByPage: pPage=%p:{.Key=%RHp, .idx=%d, enmKind=%s} iUser=%#x iUserTable=%#x\n",
pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), iUser, iUserTable));
Assert(pPage->idx >= PGMPOOL_IDX_FIRST);
pgmLock(pVM);
#ifdef PGMPOOL_WITH_USER_TRACKING
pgmPoolTrackFreeUser(pPool, pPage, iUser, iUserTable);
#endif
#ifdef PGMPOOL_WITH_CACHE
if (!pPage->fCached)
#endif
pgmPoolFlushPage(pPool, pPage);
pgmUnlock(pVM);
STAM_PROFILE_STOP(&pPool->StatFree, a);
}
/**
* Makes one or more free page free.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
*
* @param pPool The pool.
* @param enmKind Page table kind
* @param iUser The user of the page.
*/
static int pgmPoolMakeMoreFreePages(PPGMPOOL pPool, PGMPOOLKIND enmKind, uint16_t iUser)
{
PVM pVM = pPool->CTX_SUFF(pVM);
LogFlow(("pgmPoolMakeMoreFreePages: iUser=%#x\n", iUser));
/*
* If the pool isn't full grown yet, expand it.
*/
if ( pPool->cCurPages < pPool->cMaxPages
#if defined(IN_RC)
/* Hack alert: we can't deal with jumps to ring 3 when called from MapCR3 and allocating pages for PAE PDs. */
&& enmKind != PGMPOOLKIND_PAE_PD_FOR_PAE_PD
&& (enmKind < PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD || enmKind > PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD)
#endif
)
{
STAM_PROFILE_ADV_SUSPEND(&pPool->StatAlloc, a);
#ifdef IN_RING3
int rc = PGMR3PoolGrow(pVM);
#else
int rc = VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_PGM_POOL_GROW, 0);
#endif
if (RT_FAILURE(rc))
return rc;
STAM_PROFILE_ADV_RESUME(&pPool->StatAlloc, a);
if (pPool->iFreeHead != NIL_PGMPOOL_IDX)
return VINF_SUCCESS;
}
#ifdef PGMPOOL_WITH_CACHE
/*
* Free one cached page.
*/
return pgmPoolCacheFreeOne(pPool, iUser);
#else
/*
* Flush the pool.
*
* If we have tracking enabled, it should be possible to come up with
* a cheap replacement strategy...
*/
/* @todo This path no longer works (CR3 root pages will be flushed)!! */
AssertCompileFailed();
Assert(!CPUMIsGuestInLongMode(pVM));
pgmPoolFlushAllInt(pPool);
return VERR_PGM_POOL_FLUSHED;
#endif
}
/**
* Allocates a page from the pool.
*
* This page may actually be a cached page and not in need of any processing
* on the callers part.
*
* @returns VBox status code.
* @retval VINF_SUCCESS if a NEW page was allocated.
* @retval VINF_PGM_CACHED_PAGE if a CACHED page was returned.
* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
* @param pVM The VM handle.
* @param GCPhys The GC physical address of the page we're gonna shadow.
* For 4MB and 2MB PD entries, it's the first address the
* shadow PT is covering.
* @param enmKind The kind of mapping.
* @param enmAccess Access type for the mapping (only relevant for big pages)
* @param iUser The shadow page pool index of the user table.
* @param iUserTable The index into the user table (shadowed).
* @param ppPage Where to store the pointer to the page. NULL is stored here on failure.
* @param fLockPage Lock the page
*/
int pgmPoolAllocEx(PVM pVM, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, uint16_t iUser, uint32_t iUserTable, PPPGMPOOLPAGE ppPage, bool fLockPage)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
STAM_PROFILE_ADV_START(&pPool->StatAlloc, a);
LogFlow(("pgmPoolAlloc: GCPhys=%RGp enmKind=%s iUser=%#x iUserTable=%#x\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable));
*ppPage = NULL;
/** @todo CSAM/PGMPrefetchPage messes up here during CSAMR3CheckGates
* (TRPMR3SyncIDT) because of FF priority. Try fix that?
* Assert(!(pVM->pgm.s.fGlobalSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)); */
pgmLock(pVM);
#ifdef PGMPOOL_WITH_CACHE
if (pPool->fCacheEnabled)
{
int rc2 = pgmPoolCacheAlloc(pPool, GCPhys, enmKind, enmAccess, iUser, iUserTable, ppPage);
if (RT_SUCCESS(rc2))
{
if (fLockPage)
pgmPoolLockPage(pPool, *ppPage);
pgmUnlock(pVM);
STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
LogFlow(("pgmPoolAlloc: cached returns %Rrc *ppPage=%p:{.Key=%RHp, .idx=%d}\n", rc2, *ppPage, (*ppPage)->Core.Key, (*ppPage)->idx));
return rc2;
}
}
#endif
/*
* Allocate a new one.
*/
int rc = VINF_SUCCESS;
uint16_t iNew = pPool->iFreeHead;
if (iNew == NIL_PGMPOOL_IDX)
{
rc = pgmPoolMakeMoreFreePages(pPool, enmKind, iUser);
if (RT_FAILURE(rc))
{
pgmUnlock(pVM);
Log(("pgmPoolAlloc: returns %Rrc (Free)\n", rc));
STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
return rc;
}
iNew = pPool->iFreeHead;
AssertReleaseReturn(iNew != NIL_PGMPOOL_IDX, VERR_INTERNAL_ERROR);
}
/* unlink the free head */
PPGMPOOLPAGE pPage = &pPool->aPages[iNew];
pPool->iFreeHead = pPage->iNext;
pPage->iNext = NIL_PGMPOOL_IDX;
/*
* Initialize it.
*/
pPool->cUsedPages++; /* physical handler registration / pgmPoolTrackFlushGCPhysPTsSlow requirement. */
pPage->enmKind = enmKind;
pPage->enmAccess = enmAccess;
pPage->GCPhys = GCPhys;
pPage->fSeenNonGlobal = false; /* Set this to 'true' to disable this feature. */
pPage->fMonitored = false;
pPage->fCached = false;
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
pPage->fDirty = false;
#endif
pPage->fReusedFlushPending = false;
#ifdef PGMPOOL_WITH_MONITORING
pPage->cModifications = 0;
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
#else
pPage->fCR3Mix = false;
#endif
#ifdef PGMPOOL_WITH_USER_TRACKING
pPage->cPresent = 0;
pPage->iFirstPresent = NIL_PGMPOOL_PRESENT_INDEX;
pPage->pvLastAccessHandlerFault = 0;
pPage->cLastAccessHandlerCount = 0;
pPage->pvLastAccessHandlerRip = 0;
/*
* Insert into the tracking and cache. If this fails, free the page.
*/
int rc3 = pgmPoolTrackInsert(pPool, pPage, GCPhys, iUser, iUserTable);
if (RT_FAILURE(rc3))
{
pPool->cUsedPages--;
pPage->enmKind = PGMPOOLKIND_FREE;
pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
pPage->GCPhys = NIL_RTGCPHYS;
pPage->iNext = pPool->iFreeHead;
pPool->iFreeHead = pPage->idx;
pgmUnlock(pVM);
STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
Log(("pgmPoolAlloc: returns %Rrc (Insert)\n", rc3));
return rc3;
}
#endif /* PGMPOOL_WITH_USER_TRACKING */
/*
* Commit the allocation, clear the page and return.
*/
#ifdef VBOX_WITH_STATISTICS
if (pPool->cUsedPages > pPool->cUsedPagesHigh)
pPool->cUsedPagesHigh = pPool->cUsedPages;
#endif
if (!pPage->fZeroed)
{
STAM_PROFILE_START(&pPool->StatZeroPage, z);
void *pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
ASMMemZeroPage(pv);
STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
}
*ppPage = pPage;
if (fLockPage)
pgmPoolLockPage(pPool, pPage);
pgmUnlock(pVM);
LogFlow(("pgmPoolAlloc: returns %Rrc *ppPage=%p:{.Key=%RHp, .idx=%d, .fCached=%RTbool, .fMonitored=%RTbool}\n",
rc, pPage, pPage->Core.Key, pPage->idx, pPage->fCached, pPage->fMonitored));
STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
return rc;
}
/**
* Frees a usage of a pool page.
*
* @param pVM The VM handle.
* @param HCPhys The HC physical address of the shadow page.
* @param iUser The shadow page pool index of the user table.
* @param iUserTable The index into the user table (shadowed).
*/
void pgmPoolFree(PVM pVM, RTHCPHYS HCPhys, uint16_t iUser, uint32_t iUserTable)
{
LogFlow(("pgmPoolFree: HCPhys=%RHp iUser=%#x iUserTable=%#x\n", HCPhys, iUser, iUserTable));
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, HCPhys), iUser, iUserTable);
}
/**
* Internal worker for finding a 'in-use' shadow page give by it's physical address.
*
* @returns Pointer to the shadow page structure.
* @param pPool The pool.
* @param HCPhys The HC physical address of the shadow page.
*/
PPGMPOOLPAGE pgmPoolGetPage(PPGMPOOL pPool, RTHCPHYS HCPhys)
{
PVM pVM = pPool->CTX_SUFF(pVM);
Assert(PGMIsLockOwner(pVM));
/*
* Look up the page.
*/
pgmLock(pVM);
PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
pgmUnlock(pVM);
AssertFatalMsg(pPage && pPage->enmKind != PGMPOOLKIND_FREE, ("HCPhys=%RHp pPage=%p idx=%d\n", HCPhys, pPage, (pPage) ? pPage->idx : 0));
return pPage;
}
#ifdef IN_RING3 /* currently only used in ring 3; save some space in the R0 & GC modules (left it here as we might need it elsewhere later on) */
/**
* Flush the specified page if present
*
* @param pVM The VM handle.
* @param GCPhys Guest physical address of the page to flush
*/
void pgmPoolFlushPageByGCPhys(PVM pVM, RTGCPHYS GCPhys)
{
#ifdef PGMPOOL_WITH_CACHE
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
VM_ASSERT_EMT(pVM);
/*
* Look up the GCPhys in the hash.
*/
GCPhys = GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1);
unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
if (i == NIL_PGMPOOL_IDX)
return;
do
{
PPGMPOOLPAGE pPage = &pPool->aPages[i];
if (pPage->GCPhys - GCPhys < PAGE_SIZE)
{
switch (pPage->enmKind)
{
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
case PGMPOOLKIND_64BIT_PML4:
case PGMPOOLKIND_32BIT_PD:
case PGMPOOLKIND_PAE_PDPT:
{
Log(("PGMPoolFlushPage: found pgm pool pages for %RGp\n", GCPhys));
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
if (pPage->fDirty)
STAM_COUNTER_INC(&pPool->StatForceFlushDirtyPage);
else
#endif
STAM_COUNTER_INC(&pPool->StatForceFlushPage);
Assert(!pgmPoolIsPageLocked(&pVM->pgm.s, pPage));
pgmPoolMonitorChainFlush(pPool, pPage);
return;
}
/* ignore, no monitoring. */
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
case PGMPOOLKIND_ROOT_NESTED:
case PGMPOOLKIND_PAE_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_PHYS:
case PGMPOOLKIND_32BIT_PD_PHYS:
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
break;
default:
AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
}
}
/* next */
i = pPage->iNext;
} while (i != NIL_PGMPOOL_IDX);
#endif
return;
}
#endif /* IN_RING3 */
#ifdef IN_RING3
/**
* Flushes the entire cache.
*
* It will assert a global CR3 flush (FF) and assumes the caller is aware of
* this and execute this CR3 flush.
*
* @param pPool The pool.
*/
void pgmR3PoolReset(PVM pVM)
{
PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
Assert(PGMIsLockOwner(pVM));
STAM_PROFILE_START(&pPool->StatR3Reset, a);
LogFlow(("pgmR3PoolReset:\n"));
/*
* If there are no pages in the pool, there is nothing to do.
*/
if (pPool->cCurPages <= PGMPOOL_IDX_FIRST)
{
STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
return;
}
/*
* Exit the shadow mode since we're going to clear everything,
* including the root page.
*/
for (VMCPUID i = 0; i < pVM->cCpus; i++)
{
PVMCPU pVCpu = &pVM->aCpus[i];
pgmR3ExitShadowModeBeforePoolFlush(pVM, pVCpu);
}
/*
* Nuke the free list and reinsert all pages into it.
*/
for (unsigned i = pPool->cCurPages - 1; i >= PGMPOOL_IDX_FIRST; i--)
{
PPGMPOOLPAGE pPage = &pPool->aPages[i];
Assert(pPage->Core.Key == MMPage2Phys(pVM, pPage->pvPageR3));
#ifdef PGMPOOL_WITH_MONITORING
if (pPage->fMonitored)
pgmPoolMonitorFlush(pPool, pPage);
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
pPage->cModifications = 0;
#endif
pPage->GCPhys = NIL_RTGCPHYS;
pPage->enmKind = PGMPOOLKIND_FREE;
pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
Assert(pPage->idx == i);
pPage->iNext = i + 1;
pPage->fZeroed = false; /* This could probably be optimized, but better safe than sorry. */
pPage->fSeenNonGlobal = false;
pPage->fMonitored = false;
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
pPage->fDirty = false;
#endif
pPage->fCached = false;
pPage->fReusedFlushPending = false;
#ifdef PGMPOOL_WITH_USER_TRACKING
pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
#else
pPage->fCR3Mix = false;
#endif
#ifdef PGMPOOL_WITH_CACHE
pPage->iAgeNext = NIL_PGMPOOL_IDX;
pPage->iAgePrev = NIL_PGMPOOL_IDX;
#endif
pPage->cLocked = 0;
}
pPool->aPages[pPool->cCurPages - 1].iNext = NIL_PGMPOOL_IDX;
pPool->iFreeHead = PGMPOOL_IDX_FIRST;
pPool->cUsedPages = 0;
#ifdef PGMPOOL_WITH_USER_TRACKING
/*
* Zap and reinitialize the user records.
*/
pPool->cPresent = 0;
pPool->iUserFreeHead = 0;
PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
const unsigned cMaxUsers = pPool->cMaxUsers;
for (unsigned i = 0; i < cMaxUsers; i++)
{
paUsers[i].iNext = i + 1;
paUsers[i].iUser = NIL_PGMPOOL_IDX;
paUsers[i].iUserTable = 0xfffffffe;
}
paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
#endif
#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
/*
* Clear all the GCPhys links and rebuild the phys ext free list.
*/
for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
pRam;
pRam = pRam->CTX_SUFF(pNext))
{
unsigned iPage = pRam->cb >> PAGE_SHIFT;
while (iPage-- > 0)
PGM_PAGE_SET_TRACKING(&pRam->aPages[iPage], 0);
}
pPool->iPhysExtFreeHead = 0;
PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
const unsigned cMaxPhysExts = pPool->cMaxPhysExts;
for (unsigned i = 0; i < cMaxPhysExts; i++)
{
paPhysExts[i].iNext = i + 1;
paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
}
paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
#endif
#ifdef PGMPOOL_WITH_MONITORING
/*
* Just zap the modified list.
*/
pPool->cModifiedPages = 0;
pPool->iModifiedHead = NIL_PGMPOOL_IDX;
#endif
#ifdef PGMPOOL_WITH_CACHE
/*
* Clear the GCPhys hash and the age list.
*/
for (unsigned i = 0; i < RT_ELEMENTS(pPool->aiHash); i++)
pPool->aiHash[i] = NIL_PGMPOOL_IDX;
pPool->iAgeHead = NIL_PGMPOOL_IDX;
pPool->iAgeTail = NIL_PGMPOOL_IDX;
#endif
#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
/* Clear all dirty pages. */
pPool->idxFreeDirtyPage = 0;
pPool->cDirtyPages = 0;
for (unsigned i = 0; i < RT_ELEMENTS(pPool->aIdxDirtyPages); i++)
pPool->aIdxDirtyPages[i] = NIL_PGMPOOL_IDX;
#endif
/*
* Reinsert active pages into the hash and ensure monitoring chains are correct.
*/
for (unsigned i = PGMPOOL_IDX_FIRST_SPECIAL; i < PGMPOOL_IDX_FIRST; i++)
{
PPGMPOOLPAGE pPage = &pPool->aPages[i];
pPage->iNext = NIL_PGMPOOL_IDX;
#ifdef PGMPOOL_WITH_MONITORING
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
pPage->cModifications = 0;
/* ASSUMES that we're not sharing with any of the other special pages (safe for now). */
pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
if (pPage->fMonitored)
{
int rc = PGMHandlerPhysicalChangeCallbacks(pVM, pPage->GCPhys & ~(RTGCPHYS)(PAGE_SIZE - 1),
pPool->pfnAccessHandlerR3, MMHyperCCToR3(pVM, pPage),
pPool->pfnAccessHandlerR0, MMHyperCCToR0(pVM, pPage),
pPool->pfnAccessHandlerRC, MMHyperCCToRC(pVM, pPage),
pPool->pszAccessHandler);
AssertFatalRCSuccess(rc);
# ifdef PGMPOOL_WITH_CACHE
pgmPoolHashInsert(pPool, pPage);
# endif
}
#endif
#ifdef PGMPOOL_WITH_USER_TRACKING
Assert(pPage->iUserHead == NIL_PGMPOOL_USER_INDEX); /* for now */
#endif
#ifdef PGMPOOL_WITH_CACHE
Assert(pPage->iAgeNext == NIL_PGMPOOL_IDX);
Assert(pPage->iAgePrev == NIL_PGMPOOL_IDX);
#endif
}
for (VMCPUID i = 0; i < pVM->cCpus; i++)
{
/*
* Re-enter the shadowing mode and assert Sync CR3 FF.
*/
PVMCPU pVCpu = &pVM->aCpus[i];
pgmR3ReEnterShadowModeAfterPoolFlush(pVM, pVCpu);
VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
VMCPU_FF_SET(pVCpu, VMCPU_FF_TLB_FLUSH);
}
STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
}
#endif /* IN_RING3 */
#ifdef LOG_ENABLED
static const char *pgmPoolPoolKindToStr(uint8_t enmKind)
{
switch(enmKind)
{
case PGMPOOLKIND_INVALID:
return "PGMPOOLKIND_INVALID";
case PGMPOOLKIND_FREE:
return "PGMPOOLKIND_FREE";
case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
return "PGMPOOLKIND_32BIT_PT_FOR_PHYS";
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT";
case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB";
case PGMPOOLKIND_PAE_PT_FOR_PHYS:
return "PGMPOOLKIND_PAE_PT_FOR_PHYS";
case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
return "PGMPOOLKIND_PAE_PT_FOR_32BIT_PT";
case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
return "PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB";
case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
return "PGMPOOLKIND_PAE_PT_FOR_PAE_PT";
case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
return "PGMPOOLKIND_PAE_PT_FOR_PAE_2MB";
case PGMPOOLKIND_32BIT_PD:
return "PGMPOOLKIND_32BIT_PD";
case PGMPOOLKIND_32BIT_PD_PHYS:
return "PGMPOOLKIND_32BIT_PD_PHYS";
case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
return "PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD";
case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
return "PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD";
case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
return "PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD";
case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
return "PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD";
case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
return "PGMPOOLKIND_PAE_PD_FOR_PAE_PD";
case PGMPOOLKIND_PAE_PD_PHYS:
return "PGMPOOLKIND_PAE_PD_PHYS";
case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
return "PGMPOOLKIND_PAE_PDPT_FOR_32BIT";
case PGMPOOLKIND_PAE_PDPT:
return "PGMPOOLKIND_PAE_PDPT";
case PGMPOOLKIND_PAE_PDPT_PHYS:
return "PGMPOOLKIND_PAE_PDPT_PHYS";
case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
return "PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT";
case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
return "PGMPOOLKIND_64BIT_PDPT_FOR_PHYS";
case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
return "PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD";
case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
return "PGMPOOLKIND_64BIT_PD_FOR_PHYS";
case PGMPOOLKIND_64BIT_PML4:
return "PGMPOOLKIND_64BIT_PML4";
case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
return "PGMPOOLKIND_EPT_PDPT_FOR_PHYS";
case PGMPOOLKIND_EPT_PD_FOR_PHYS:
return "PGMPOOLKIND_EPT_PD_FOR_PHYS";
case PGMPOOLKIND_EPT_PT_FOR_PHYS:
return "PGMPOOLKIND_EPT_PT_FOR_PHYS";
case PGMPOOLKIND_ROOT_NESTED:
return "PGMPOOLKIND_ROOT_NESTED";
}
return "Unknown kind!";
}
#endif /* LOG_ENABLED*/