/* $Id: PGMAllBth.h 8033 2008-04-16 12:40:16Z vboxsync $ */ /** @file * VBox - Page Manager, Shadow+Guest Paging Template - All context code. * * This file is a big challenge! */ /* * Copyright (C) 2006-2007 innotek GmbH * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /******************************************************************************* * Internal Functions * *******************************************************************************/ __BEGIN_DECLS PGM_BTH_DECL(int, Trap0eHandler)(PVM pVM, RTGCUINT uErr, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault); PGM_BTH_DECL(int, InvalidatePage)(PVM pVM, RTGCUINTPTR GCPtrPage); PGM_BTH_DECL(int, SyncPage)(PVM pVM, GSTPDE PdeSrc, RTGCUINTPTR GCPtrPage, unsigned cPages, unsigned uErr); PGM_BTH_DECL(int, CheckPageFault)(PVM pVM, uint32_t uErr, PSHWPDE pPdeDst, PGSTPDE pPdeSrc, RTGCUINTPTR GCPtrPage); PGM_BTH_DECL(int, SyncPT)(PVM pVM, unsigned iPD, PGSTPD pPDSrc, RTGCUINTPTR GCPtrPage); PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVM pVM, RTGCUINTPTR Addr, unsigned fPage, unsigned uErr); PGM_BTH_DECL(int, PrefetchPage)(PVM pVM, RTGCUINTPTR GCPtrPage); PGM_BTH_DECL(int, SyncCR3)(PVM pVM, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal); #ifdef VBOX_STRICT PGM_BTH_DECL(unsigned, AssertCR3)(PVM pVM, uint64_t cr3, uint64_t cr4, RTGCUINTPTR GCPtr = 0, RTGCUINTPTR cb = ~(RTGCUINTPTR)0); #endif #ifdef PGMPOOL_WITH_USER_TRACKING DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackDeref)(PVM pVM, PPGMPOOLPAGE pShwPage, RTHCPHYS HCPhys); #endif __END_DECLS /* Filter out some illegal combinations of guest and shadow paging, so we can remove redundant checks inside functions. */ #if PGM_GST_TYPE == PGM_TYPE_PAE && PGM_SHW_TYPE != PGM_TYPE_PAE #error "Invalid combination; PAE guest implies PAE shadow" #endif #if (PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT) \ && !(PGM_SHW_TYPE == PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_PAE) #error "Invalid combination; real or protected mode without paging implies 32 bits or PAE shadow paging." #endif #if (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE) \ && !(PGM_SHW_TYPE == PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_PAE) #error "Invalid combination; 32 bits guest paging or PAE implies 32 bits or PAE shadow paging." #endif #if (PGM_GST_TYPE == PGM_TYPE_AMD64 && PGM_SHW_TYPE != PGM_TYPE_AMD64) || (PGM_SHW_TYPE == PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_AMD64) #error "Invalid combination; AMD64 guest implies AMD64 shadow and vice versa" #endif #ifdef IN_RING0 /* no mappings in VT-x and AMD-V mode */ #define PGM_WITHOUT_MAPPINGS #endif /** * #PF Handler for raw-mode guest execution. * * @returns VBox status code (appropriate for trap handling and GC return). * @param pVM VM Handle. * @param uErr The trap error code. * @param pRegFrame Trap register frame. * @param pvFault The fault address. */ PGM_BTH_DECL(int, Trap0eHandler)(PVM pVM, RTGCUINT uErr, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault) { #if (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT || PGM_GST_TYPE == PGM_TYPE_PAE) && PGM_SHW_TYPE != PGM_TYPE_AMD64 # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_PAE /* * Hide the instruction fetch trap indicator for now. */ /** @todo NXE will change this and we must fix NXE in the switcher too! */ if (uErr & X86_TRAP_PF_ID) { uErr &= ~X86_TRAP_PF_ID; TRPMSetErrorCode(pVM, uErr); } # endif /* * Get PDs. */ int rc; # if PGM_WITH_PAGING(PGM_GST_TYPE) # if PGM_GST_TYPE == PGM_TYPE_32BIT const unsigned iPDSrc = (RTGCUINTPTR)pvFault >> GST_PD_SHIFT; PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); # else /* PAE */ unsigned iPDSrc; PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, (RTGCUINTPTR)pvFault, &iPDSrc); /* Quick check for a valid guest trap. */ if (!pPDSrc) { STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eGuestTrap; }); TRPMSetErrorCode(pVM, uErr); return VINF_EM_RAW_GUEST_TRAP; } # endif # else PGSTPD pPDSrc = NULL; const unsigned iPDSrc = 0; # endif const unsigned iPDDst = (RTGCUINTPTR)pvFault >> SHW_PD_SHIFT; # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD); # elif PGM_SHW_TYPE == PGM_TYPE_PAE PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]; /* We treat this as a PD with 2048 entries. */ # if PGM_GST_TYPE == PGM_TYPE_PAE /* Did we mark the PDPT as not present in SyncCR3? */ unsigned iPDPTE = ((RTGCUINTPTR)pvFault >> SHW_PDPT_SHIFT) & SHW_PDPT_MASK; if (!pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present) { pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present = 1; } # endif # else AssertFailed(); # endif # if PGM_WITH_PAGING(PGM_GST_TYPE) # ifdef PGM_SYNC_DIRTY_BIT /* * If we successfully correct the write protection fault due to dirty bit * tracking, or this page fault is a genuine one, then return immediately. */ STAM_PROFILE_START(&pVM->pgm.s.StatCheckPageFault, e); rc = PGM_BTH_NAME(CheckPageFault)(pVM, uErr, &pPDDst->a[iPDDst], &pPDSrc->a[iPDSrc], (RTGCUINTPTR)pvFault); STAM_PROFILE_STOP(&pVM->pgm.s.StatCheckPageFault, e); if ( rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT || rc == VINF_EM_RAW_GUEST_TRAP) { STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? &pVM->pgm.s.StatTrap0eDirtyAndAccessedBits : &pVM->pgm.s.StatTrap0eGuestTrap; }); LogBird(("Trap0eHandler: returns %s\n", rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? "VINF_SUCCESS" : "VINF_EM_RAW_GUEST_TRAP")); return rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? VINF_SUCCESS : rc; } # endif STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0ePD[iPDSrc]); # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ /* * A common case is the not-present error caused by lazy page table syncing. * * It is IMPORTANT that we weed out any access to non-present shadow PDEs here * so we can safely assume that the shadow PT is present when calling SyncPage later. * * On failure, we ASSUME that SyncPT is out of memory or detected some kind * of mapping conflict and defer to SyncCR3 in R3. * (Again, we do NOT support access handlers for non-present guest pages.) * */ # if PGM_WITH_PAGING(PGM_GST_TYPE) GSTPDE PdeSrc = pPDSrc->a[iPDSrc]; # else GSTPDE PdeSrc; PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */ PdeSrc.n.u1Present = 1; PdeSrc.n.u1Write = 1; PdeSrc.n.u1Accessed = 1; PdeSrc.n.u1User = 1; # endif if ( !(uErr & X86_TRAP_PF_P) /* not set means page not present instead of page protection violation */ && !pPDDst->a[iPDDst].n.u1Present && PdeSrc.n.u1Present ) { STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eSyncPT; }); STAM_PROFILE_START(&pVM->pgm.s.StatLazySyncPT, f); LogFlow(("=>SyncPT %04x = %08x\n", iPDSrc, PdeSrc.au32[0])); rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, (RTGCUINTPTR)pvFault); if (VBOX_SUCCESS(rc)) { STAM_PROFILE_STOP(&pVM->pgm.s.StatLazySyncPT, f); return rc; } Log(("SyncPT: %d failed!! rc=%d\n", iPDSrc, rc)); VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */ STAM_PROFILE_STOP(&pVM->pgm.s.StatLazySyncPT, f); return VINF_PGM_SYNC_CR3; } # if PGM_WITH_PAGING(PGM_GST_TYPE) /* * Check if this address is within any of our mappings. * * This is *very* fast and it's gonna save us a bit of effort below and prevent * us from screwing ourself with MMIO2 pages which have a GC Mapping (VRam). * (BTW, it's impossible to have physical access handlers in a mapping.) */ if (pgmMapAreMappingsEnabled(&pVM->pgm.s)) { STAM_PROFILE_START(&pVM->pgm.s.StatMapping, a); PPGMMAPPING pMapping = CTXALLSUFF(pVM->pgm.s.pMappings); for ( ; pMapping; pMapping = CTXALLSUFF(pMapping->pNext)) { if ((RTGCUINTPTR)pvFault < (RTGCUINTPTR)pMapping->GCPtr) break; if ((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pMapping->GCPtr < pMapping->cb) { /* * The first thing we check is if we've got an undetected conflict. */ if (!pVM->pgm.s.fMappingsFixed) { unsigned iPT = pMapping->cb >> GST_PD_SHIFT; while (iPT-- > 0) if (pPDSrc->a[iPDSrc + iPT].n.u1Present) { STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eConflicts); Log(("Trap0e: Detected Conflict %VGv-%VGv\n", pMapping->GCPtr, pMapping->GCPtrLast)); VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); /** @todo no need to do global sync,right? */ STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a); return VINF_PGM_SYNC_CR3; } } /* * Check if the fault address is in a virtual page access handler range. */ PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->HyperVirtHandlers, pvFault); if ( pCur && (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb && uErr & X86_TRAP_PF_RW) { # ifdef IN_GC STAM_PROFILE_START(&pCur->Stat, h); rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr); STAM_PROFILE_STOP(&pCur->Stat, h); # else AssertFailed(); rc = VINF_EM_RAW_EMULATE_INSTR; /* can't happen with VMX */ # endif STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eMapHandler); STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a); return rc; } /* * Pretend we're not here and let the guest handle the trap. */ TRPMSetErrorCode(pVM, uErr & ~X86_TRAP_PF_P); STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eMap); LogFlow(("PGM: Mapping access -> route trap to recompiler!\n")); STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a); return VINF_EM_RAW_GUEST_TRAP; } } STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a); } /* pgmAreMappingsEnabled(&pVM->pgm.s) */ # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ /* * Check if this fault address is flagged for special treatment, * which means we'll have to figure out the physical address and * check flags associated with it. * * ASSUME that we can limit any special access handling to pages * in page tables which the guest believes to be present. */ if (PdeSrc.n.u1Present) { RTGCPHYS GCPhys = NIL_RTGCPHYS; # if PGM_WITH_PAGING(PGM_GST_TYPE) uint32_t cr4 = CPUMGetGuestCR4(pVM); if ( PdeSrc.b.u1Size && (cr4 & X86_CR4_PSE)) GCPhys = (PdeSrc.u & GST_PDE_BIG_PG_MASK) | ((RTGCPHYS)pvFault & (GST_BIG_PAGE_OFFSET_MASK ^ PAGE_OFFSET_MASK)); else { PGSTPT pPTSrc; rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { unsigned iPTESrc = ((RTGCUINTPTR)pvFault >> GST_PT_SHIFT) & GST_PT_MASK; if (pPTSrc->a[iPTESrc].n.u1Present) GCPhys = pPTSrc->a[iPTESrc].u & GST_PTE_PG_MASK; } } # else /* No paging so the fault address is the physical address */ GCPhys = (RTGCPHYS)((RTGCUINTPTR)pvFault & ~PAGE_OFFSET_MASK); # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ /* * If we have a GC address we'll check if it has any flags set. */ if (GCPhys != NIL_RTGCPHYS) { STAM_PROFILE_START(&pVM->pgm.s.StatHandlers, b); PPGMPAGE pPage; rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage); if (VBOX_SUCCESS(rc)) { if (PGM_PAGE_HAS_ANY_HANDLERS(pPage)) { if (PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage)) { /* * Physical page access handler. */ const RTGCPHYS GCPhysFault = GCPhys | ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK); PPGMPHYSHANDLER pCur = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->PhysHandlers, GCPhysFault); if (pCur) { # ifdef PGM_SYNC_N_PAGES /* * If the region is write protected and we got a page not present fault, then sync * the pages. If the fault was caused by a read, then restart the instruction. * In case of write access continue to the GC write handler. * * ASSUMES that there is only one handler per page or that they have similar write properties. */ if ( pCur->enmType == PGMPHYSHANDLERTYPE_PHYSICAL_WRITE && !(uErr & X86_TRAP_PF_P)) { rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr); if ( VBOX_FAILURE(rc) || !(uErr & X86_TRAP_PF_RW) || rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE) { AssertRC(rc); STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndPhys; }); return rc; } } # endif AssertMsg( pCur->enmType != PGMPHYSHANDLERTYPE_PHYSICAL_WRITE || (pCur->enmType == PGMPHYSHANDLERTYPE_PHYSICAL_WRITE && (uErr & X86_TRAP_PF_RW)), ("Unexpected trap for physical handler: %08X (phys=%08x) HCPhys=%X uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType)); #if defined(IN_GC) || defined(IN_RING0) if (CTXALLSUFF(pCur->pfnHandler)) { STAM_PROFILE_START(&pCur->Stat, h); rc = pCur->CTXALLSUFF(pfnHandler)(pVM, uErr, pRegFrame, pvFault, GCPhysFault, CTXALLSUFF(pCur->pvUser)); STAM_PROFILE_STOP(&pCur->Stat, h); } else #endif rc = VINF_EM_RAW_EMULATE_INSTR; STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersPhysical); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndPhys; }); return rc; } } # if PGM_WITH_PAGING(PGM_GST_TYPE) else { # ifdef PGM_SYNC_N_PAGES /* * If the region is write protected and we got a page not present fault, then sync * the pages. If the fault was caused by a read, then restart the instruction. * In case of write access continue to the GC write handler. */ if ( PGM_PAGE_GET_HNDL_VIRT_STATE(pPage) < PGM_PAGE_HNDL_PHYS_STATE_ALL && !(uErr & X86_TRAP_PF_P)) { rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr); if ( VBOX_FAILURE(rc) || rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE || !(uErr & X86_TRAP_PF_RW)) { AssertRC(rc); STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndVirt; }); return rc; } } # endif /* * Ok, it's an virtual page access handler. * * Since it's faster to search by address, we'll do that first * and then retry by GCPhys if that fails. */ /** @todo r=bird: perhaps we should consider looking up by physical address directly now? */ /** @note r=svl: true, but lookup on virtual address should remain as a fallback as phys & virt trees might be out of sync, because the * page was changed without us noticing it (not-present -> present without invlpg or mov cr3, xxx) */ PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->VirtHandlers, pvFault); if (pCur) { AssertMsg(!((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb) || ( pCur->enmType != PGMVIRTHANDLERTYPE_WRITE || !(uErr & X86_TRAP_PF_P) || (pCur->enmType == PGMVIRTHANDLERTYPE_WRITE && (uErr & X86_TRAP_PF_RW))), ("Unexpected trap for virtual handler: %VGv (phys=%VGp) HCPhys=%HGp uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType)); if ( (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb && ( uErr & X86_TRAP_PF_RW || pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) ) { # ifdef IN_GC STAM_PROFILE_START(&pCur->Stat, h); rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr); STAM_PROFILE_STOP(&pCur->Stat, h); # else rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */ # endif STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtual); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; }); return rc; } /* Unhandled part of a monitored page */ } else { /* Check by physical address. */ PPGMVIRTHANDLER pCur; unsigned iPage; rc = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys + ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK), &pCur, &iPage); Assert(VBOX_SUCCESS(rc) || !pCur); if ( pCur && ( uErr & X86_TRAP_PF_RW || pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) ) { Assert((pCur->aPhysToVirt[iPage].Core.Key & X86_PTE_PAE_PG_MASK) == GCPhys); # ifdef IN_GC RTGCUINTPTR off = (iPage << PAGE_SHIFT) + ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK) - ((RTGCUINTPTR)pCur->GCPtr & PAGE_OFFSET_MASK); Assert(off < pCur->cb); STAM_PROFILE_START(&pCur->Stat, h); rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, off); STAM_PROFILE_STOP(&pCur->Stat, h); # else rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */ # endif STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtualByPhys); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; }); return rc; } } } # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ /* * There is a handled area of the page, but this fault doesn't belong to it. * We must emulate the instruction. * * To avoid crashing (non-fatal) in the interpreter and go back to the recompiler * we first check if this was a page-not-present fault for a page with only * write access handlers. Restart the instruction if it wasn't a write access. */ STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersUnhandled); if ( !PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage) && !(uErr & X86_TRAP_PF_P)) { rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr); if ( VBOX_FAILURE(rc) || rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE || !(uErr & X86_TRAP_PF_RW)) { AssertRC(rc); STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndPhys; }); return rc; } } /** @todo This particular case can cause quite a lot of overhead. E.g. early stage of kernel booting in Ubuntu 6.06 * It's writing to an unhandled part of the LDT page several million times. */ rc = PGMInterpretInstruction(pVM, pRegFrame, pvFault); LogFlow(("PGM: PGMInterpretInstruction -> rc=%d HCPhys=%RHp%s%s\n", rc, pPage->HCPhys, PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage) ? " phys" : "", PGM_PAGE_HAS_ANY_VIRTUAL_HANDLERS(pPage) ? " virt" : "")); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndUnhandled; }); return rc; } /* if any kind of handler */ # if PGM_WITH_PAGING(PGM_GST_TYPE) if (uErr & X86_TRAP_PF_P) { /* * The page isn't marked, but it might still be monitored by a virtual page access handler. * (ASSUMES no temporary disabling of virtual handlers.) */ /** @todo r=bird: Since the purpose is to catch out of sync pages with virtual handler(s) here, * we should correct both the shadow page table and physical memory flags, and not only check for * accesses within the handler region but for access to pages with virtual handlers. */ PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->VirtHandlers, pvFault); if (pCur) { AssertMsg( !((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb) || ( pCur->enmType != PGMVIRTHANDLERTYPE_WRITE || !(uErr & X86_TRAP_PF_P) || (pCur->enmType == PGMVIRTHANDLERTYPE_WRITE && (uErr & X86_TRAP_PF_RW))), ("Unexpected trap for virtual handler: %08X (phys=%08x) HCPhys=%X uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType)); if ( (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb && ( uErr & X86_TRAP_PF_RW || pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) ) { # ifdef IN_GC STAM_PROFILE_START(&pCur->Stat, h); rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr); STAM_PROFILE_STOP(&pCur->Stat, h); # else rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */ # endif STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtualUnmarked); STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; }); return rc; } } } # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ } STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b); # ifdef PGM_OUT_OF_SYNC_IN_GC /* * We are here only if page is present in Guest page tables and trap is not handled * by our handlers. * Check it for page out-of-sync situation. */ STAM_PROFILE_START(&pVM->pgm.s.StatOutOfSync, c); if (!(uErr & X86_TRAP_PF_P)) { /* * Page is not present in our page tables. * Try to sync it! * BTW, fPageShw is invalid in this branch! */ if (uErr & X86_TRAP_PF_US) STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser); else /* supervisor */ STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor); # if defined(LOG_ENABLED) && !defined(IN_RING0) RTGCPHYS GCPhys; uint64_t fPageGst; PGMGstGetPage(pVM, pvFault, &fPageGst, &GCPhys); Log(("Page out of sync: %p eip=%08x PdeSrc.n.u1User=%d fPageGst=%08llx GCPhys=%VGp scan=%d\n", pvFault, pRegFrame->eip, PdeSrc.n.u1User, fPageGst, GCPhys, CSAMDoesPageNeedScanning(pVM, (RTGCPTR)pRegFrame->eip))); # endif /* LOG_ENABLED */ # if PGM_WITH_PAGING(PGM_GST_TYPE) && !defined(IN_RING0) if (CPUMGetGuestCPL(pVM, pRegFrame) == 0) { uint64_t fPageGst; rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL); if ( VBOX_SUCCESS(rc) && !(fPageGst & X86_PTE_US)) { /* Note: can't check for X86_TRAP_ID bit, because that requires execute disable support on the CPU */ if ( pvFault == (RTGCPTR)pRegFrame->eip || (RTGCUINTPTR)pvFault - pRegFrame->eip < 8 /* instruction crossing a page boundary */ # ifdef CSAM_DETECT_NEW_CODE_PAGES || ( !PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) && CSAMDoesPageNeedScanning(pVM, (RTGCPTR)pRegFrame->eip)) /* any new code we encounter here */ # endif /* CSAM_DETECT_NEW_CODE_PAGES */ ) { LogFlow(("CSAMExecFault %VGv\n", pRegFrame->eip)); rc = CSAMExecFault(pVM, (RTGCPTR)pRegFrame->eip); if (rc != VINF_SUCCESS) { /* * CSAM needs to perform a job in ring 3. * * Sync the page before going to the host context; otherwise we'll end up in a loop if * CSAM fails (e.g. instruction crosses a page boundary and the next page is not present) */ LogFlow(("CSAM ring 3 job\n")); int rc2 = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, 1, uErr); AssertRC(rc2); STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eCSAM; }); return rc; } } # ifdef CSAM_DETECT_NEW_CODE_PAGES else if ( uErr == X86_TRAP_PF_RW && pRegFrame->ecx >= 0x100 /* early check for movswd count */ && pRegFrame->ecx < 0x10000 ) { /* In case of a write to a non-present supervisor shadow page, we'll take special precautions * to detect loading of new code pages. */ /* * Decode the instruction. */ RTGCPTR PC; rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC); if (rc == VINF_SUCCESS) { DISCPUSTATE Cpu; uint32_t cbOp; rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp); /* For now we'll restrict this to rep movsw/d instructions */ if ( rc == VINF_SUCCESS && Cpu.pCurInstr->opcode == OP_MOVSWD && (Cpu.prefix & PREFIX_REP)) { CSAMMarkPossibleCodePage(pVM, pvFault); } } } # endif /* CSAM_DETECT_NEW_CODE_PAGES */ /* * Mark this page as safe. */ /** @todo not correct for pages that contain both code and data!! */ Log2(("CSAMMarkPage %p; scanned=%d\n", pvFault, true)); CSAMMarkPage(pVM, pvFault, true); } } # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) && !defined(IN_RING0) */ rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr); if (VBOX_SUCCESS(rc)) { /* The page was successfully synced, return to the guest. */ STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSync; }); return VINF_SUCCESS; } } else { /* * A side effect of not flushing global PDEs are out of sync pages due * to physical monitored regions, that are no longer valid. * Assume for now it only applies to the read/write flag */ if (VBOX_SUCCESS(rc) && (uErr & X86_TRAP_PF_RW)) { if (uErr & X86_TRAP_PF_US) STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser); else /* supervisor */ STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor); /* * Note: Do NOT use PGM_SYNC_NR_PAGES here. That only works if the page is not present, which is not true in this case. */ rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, 1, uErr); if (VBOX_SUCCESS(rc)) { /* * Page was successfully synced, return to guest. */ # ifdef VBOX_STRICT RTGCPHYS GCPhys; uint64_t fPageGst; rc = PGMGstGetPage(pVM, pvFault, &fPageGst, &GCPhys); Assert(VBOX_SUCCESS(rc) && fPageGst & X86_PTE_RW); LogFlow(("Obsolete physical monitor page out of sync %VGv - phys %VGp flags=%08llx\n", pvFault, GCPhys, (uint64_t)fPageGst)); uint64_t fPageShw; rc = PGMShwGetPage(pVM, pvFault, &fPageShw, NULL); Assert(VBOX_SUCCESS(rc) && fPageShw & X86_PTE_RW); # endif /* VBOX_STRICT */ STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c); STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncObsHnd; }); return VINF_SUCCESS; } /* Check to see if we need to emulate the instruction as X86_CR0_WP has been cleared. */ if ( CPUMGetGuestCPL(pVM, pRegFrame) == 0 && ((CPUMGetGuestCR0(pVM) & (X86_CR0_WP|X86_CR0_PG)) == X86_CR0_PG) && (uErr & (X86_TRAP_PF_RW | X86_TRAP_PF_P)) == (X86_TRAP_PF_RW | X86_TRAP_PF_P)) { uint64_t fPageGst; rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL); if ( VBOX_SUCCESS(rc) && !(fPageGst & X86_PTE_RW)) { rc = PGMInterpretInstruction(pVM, pRegFrame, pvFault); if (VBOX_SUCCESS(rc)) STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eWPEmulGC); else STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eWPEmulR3); return rc; } else AssertMsgFailed(("Unexpected r/w page %x flag=%x\n", pvFault, (uint32_t)fPageGst)); } } # if PGM_WITH_PAGING(PGM_GST_TYPE) # ifdef VBOX_STRICT /* * Check for VMM page flags vs. Guest page flags consistency. * Currently only for debug purposes. */ if (VBOX_SUCCESS(rc)) { /* Get guest page flags. */ uint64_t fPageGst; rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL); if (VBOX_SUCCESS(rc)) { uint64_t fPageShw; rc = PGMShwGetPage(pVM, pvFault, &fPageShw, NULL); /* * Compare page flags. * Note: we have AVL, A, D bits desynched. */ AssertMsg((fPageShw & ~(X86_PTE_A | X86_PTE_D | X86_PTE_AVL_MASK)) == (fPageGst & ~(X86_PTE_A | X86_PTE_D | X86_PTE_AVL_MASK)), ("Page flags mismatch! pvFault=%p GCPhys=%VGp fPageShw=%08llx fPageGst=%08llx\n", pvFault, GCPhys, fPageShw, fPageGst)); } else AssertMsgFailed(("PGMGstGetPage rc=%Vrc\n", rc)); } else AssertMsgFailed(("PGMGCGetPage rc=%Vrc\n", rc)); # endif /* VBOX_STRICT */ # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ } STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c); # endif /* PGM_OUT_OF_SYNC_IN_GC */ } else { /* * Page not present in Guest OS or invalid page table address. * This is potential virtual page access handler food. * * For the present we'll say that our access handlers don't * work for this case - we've already discarded the page table * not present case which is identical to this. * * When we perchance find we need this, we will probably have AVL * trees (offset based) to operate on and we can measure their speed * agains mapping a page table and probably rearrange this handling * a bit. (Like, searching virtual ranges before checking the * physical address.) */ } } # if PGM_WITH_PAGING(PGM_GST_TYPE) /* * Conclusion, this is a guest trap. */ LogFlow(("PGM: Unhandled #PF -> route trap to recompiler!\n")); STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eUnhandled); return VINF_EM_RAW_GUEST_TRAP; # else /* present, but not a monitored page; perhaps the guest is probing physical memory */ return VINF_EM_RAW_EMULATE_INSTR; # endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ #else /* PGM_GST_TYPE != PGM_TYPE_32BIT */ AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE)); return VERR_INTERNAL_ERROR; #endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */ } /** * Emulation of the invlpg instruction. * * * @returns VBox status code. * * @param pVM VM handle. * @param GCPtrPage Page to invalidate. * * @remark ASSUMES that the guest is updating before invalidating. This order * isn't required by the CPU, so this is speculative and could cause * trouble. * * @todo Flush page or page directory only if necessary! * @todo Add a #define for simply invalidating the page. */ PGM_BTH_DECL(int, InvalidatePage)(PVM pVM, RTGCUINTPTR GCPtrPage) { #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE LogFlow(("InvalidatePage %x\n", GCPtrPage)); /* * Get the shadow PD entry and skip out if this PD isn't present. * (Guessing that it is frequent for a shadow PDE to not be present, do this first.) */ const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT; # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PDE pPdeDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst]; # else PX86PDEPAE pPdeDst = &pVM->pgm.s.CTXMID(ap,PaePDs[0])->a[iPDDst]; # endif const SHWPDE PdeDst = *pPdeDst; if (!PdeDst.n.u1Present) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePageSkipped)); return VINF_SUCCESS; } /* * Get the guest PD entry and calc big page. */ # if PGM_GST_TYPE == PGM_TYPE_32BIT PX86PD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); const unsigned iPDSrc = GCPtrPage >> GST_PD_SHIFT; GSTPDE PdeSrc = pPDSrc->a[iPDSrc]; # else /* PAE */ unsigned iPDSrc; PX86PDPAE pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc); GSTPDE PdeSrc; if (pPDSrc) PdeSrc = pPDSrc->a[iPDSrc]; else PdeSrc.u = 0; # endif const uint32_t cr4 = CPUMGetGuestCR4(pVM); const bool fIsBigPage = PdeSrc.b.u1Size && (cr4 & X86_CR4_PSE); # ifdef IN_RING3 /* * If a CR3 Sync is pending we may ignore the invalidate page operation * depending on the kind of sync and if it's a global page or not. * This doesn't make sense in GC/R0 so we'll skip it entirely there. */ # ifdef PGM_SKIP_GLOBAL_PAGEDIRS_ON_NONGLOBAL_FLUSH if ( VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3) || ( VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3_NON_GLOBAL) && fIsBigPage && PdeSrc.b.u1Global && (cr4 & X86_CR4_PGE) ) ) # else if (VM_FF_ISPENDING(pVM, VM_FF_PGM_SYNC_CR3 | VM_FF_PGM_SYNC_CR3_NON_GLOBAL) ) # endif { STAM_COUNTER_INC(&pVM->pgm.s.StatHCInvalidatePageSkipped); return VINF_SUCCESS; } # endif /* IN_RING3 */ /* * Deal with the Guest PDE. */ int rc = VINF_SUCCESS; if (PdeSrc.n.u1Present) { if (PdeDst.u & PGM_PDFLAGS_MAPPING) { /* * Conflict - Let SyncPT deal with it to avoid duplicate code. */ Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s)); Assert(PGMGetGuestMode(pVM) <= PGMMODE_32_BIT); rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage); } else if ( PdeSrc.n.u1User != PdeDst.n.u1User || (!PdeSrc.n.u1Write && PdeDst.n.u1Write)) { /* * Mark not present so we can resync the PDE when it's used. */ LogFlow(("InvalidatePage: Out-of-sync at %VGp PdeSrc=%RX64 PdeDst=%RX64\n", GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); pPdeDst->u = 0; STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDOutOfSync)); PGM_INVL_GUEST_TLBS(); } # ifdef PGM_SYNC_ACCESSED_BIT else if (!PdeSrc.n.u1Accessed) { /* * Mark not present so we can set the accessed bit. */ pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); pPdeDst->u = 0; STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDNAs)); PGM_INVL_GUEST_TLBS(); } # endif else if (!fIsBigPage) { /* * 4KB - page. */ PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK); RTGCPHYS GCPhys = PdeSrc.u & GST_PDE_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ GCPhys |= (iPDDst & 1) * (PAGE_SIZE/2); # endif if (pShwPage->GCPhys == GCPhys) { # if 0 /* likely cause of a major performance regression; must be SyncPageWorkerTrackDeref then */ const unsigned iPTEDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; PSHWPT pPT = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); if (pPT->a[iPTEDst].n.u1Present) { # ifdef PGMPOOL_WITH_USER_TRACKING /* This is very unlikely with caching/monitoring enabled. */ PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPT->a[iPTEDst].u & SHW_PTE_PG_MASK); # endif pPT->a[iPTEDst].u = 0; } # else /* Syncing it here isn't 100% safe and it's probably not worth spending time syncing it. */ rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0); if (VBOX_SUCCESS(rc)) rc = VINF_SUCCESS; # endif STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4KBPages)); PGM_INVL_PG(GCPtrPage); } else { /* * The page table address changed. */ LogFlow(("InvalidatePage: Out-of-sync at %VGp PdeSrc=%RX64 PdeDst=%RX64 ShwGCPhys=%VGp iPDDst=%#x\n", GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u, pShwPage->GCPhys, iPDDst)); pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); pPdeDst->u = 0; STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDOutOfSync)); PGM_INVL_GUEST_TLBS(); } } else { /* * 4MB - page. */ /* Before freeing the page, check if anything really changed. */ PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK); RTGCPHYS GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/ GCPhys |= GCPtrPage & (1 << X86_PD_PAE_SHIFT); # endif if ( pShwPage->GCPhys == GCPhys && pShwPage->enmKind == BTH_PGMPOOLKIND_PT_FOR_BIG) { /* ASSUMES a the given bits are identical for 4M and normal PDEs */ /** @todo PAT */ # ifdef PGM_SYNC_DIRTY_BIT if ( (PdeSrc.u & (X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_PWT | X86_PDE_PCD)) == (PdeDst.u & (X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_PWT | X86_PDE_PCD)) && ( PdeSrc.b.u1Dirty /** @todo rainy day: What about read-only 4M pages? not very common, but still... */ || (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY))) # else if ( (PdeSrc.u & (X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_PWT | X86_PDE_PCD)) == (PdeDst.u & (X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_PWT | X86_PDE_PCD))) # endif { LogFlow(("Skipping flush for big page containing %VGv (PD=%X)-> nothing has changed!\n", GCPtrPage, iPDSrc)); STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4MBPagesSkip)); return VINF_SUCCESS; } } /* * Ok, the page table is present and it's been changed in the guest. * If we're in host context, we'll just mark it as not present taking the lazy approach. * We could do this for some flushes in GC too, but we need an algorithm for * deciding which 4MB pages containing code likely to be executed very soon. */ pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); pPdeDst->u = 0; STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4MBPages)); PGM_INVL_BIG_PG(GCPtrPage); } } else { /* * Page directory is not present, mark shadow PDE not present. */ if (!(PdeDst.u & PGM_PDFLAGS_MAPPING)) { pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); pPdeDst->u = 0; STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDNPs)); PGM_INVL_PG(GCPtrPage); } else { Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s)); STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDMappings)); } } return rc; #elif PGM_GST_TYPE == PGM_TYPE_AMD64 //# error not implemented return VERR_INTERNAL_ERROR; #else /* guest real and protected mode */ /* There's no such thing as InvalidatePage when paging is disabled, so just ignore. */ return VINF_SUCCESS; #endif } #ifdef PGMPOOL_WITH_USER_TRACKING /** * Update the tracking of shadowed pages. * * @param pVM The VM handle. * @param pShwPage The shadow page. * @param HCPhys The physical page we is being dereferenced. */ DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackDeref)(PVM pVM, PPGMPOOLPAGE pShwPage, RTHCPHYS HCPhys) { # ifdef PGMPOOL_WITH_GCPHYS_TRACKING STAM_PROFILE_START(&pVM->pgm.s.StatTrackDeref, a); LogFlow(("SyncPageWorkerTrackDeref: Damn HCPhys=%VHp pShwPage->idx=%#x!!!\n", HCPhys, pShwPage->idx)); /** @todo If this turns out to be a bottle neck (*very* likely) two things can be done: * 1. have a medium sized HCPhys -> GCPhys TLB (hash?) * 2. write protect all shadowed pages. I.e. implement caching. */ /* * Find the guest address. */ for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges); pRam; pRam = CTXALLSUFF(pRam->pNext)) { unsigned iPage = pRam->cb >> PAGE_SHIFT; while (iPage-- > 0) { if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys) { PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool); pgmTrackDerefGCPhys(pPool, pShwPage, &pRam->aPages[iPage]); pShwPage->cPresent--; pPool->cPresent--; STAM_PROFILE_STOP(&pVM->pgm.s.StatTrackDeref, a); return; } } } for (;;) AssertReleaseMsgFailed(("HCPhys=%VHp wasn't found!\n", HCPhys)); # else /* !PGMPOOL_WITH_GCPHYS_TRACKING */ pShwPage->cPresent--; pVM->pgm.s.CTXSUFF(pPool)->cPresent--; # endif /* !PGMPOOL_WITH_GCPHYS_TRACKING */ } /** * Update the tracking of shadowed pages. * * @param pVM The VM handle. * @param pShwPage The shadow page. * @param u16 The top 16-bit of the pPage->HCPhys. * @param pPage Pointer to the guest page. this will be modified. * @param iPTDst The index into the shadow table. */ DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(PVM pVM, PPGMPOOLPAGE pShwPage, uint16_t u16, PPGMPAGE pPage, const unsigned iPTDst) { # ifdef PGMPOOL_WITH_GCPHYS_TRACKING /* * We're making certain assumptions about the placement of cRef and idx. */ Assert(MM_RAM_FLAGS_IDX_SHIFT == 48); Assert(MM_RAM_FLAGS_CREFS_SHIFT > MM_RAM_FLAGS_IDX_SHIFT); /* * Just deal with the simple first time here. */ if (!u16) { STAM_COUNTER_INC(&pVM->pgm.s.StatTrackVirgin); u16 = (1 << (MM_RAM_FLAGS_CREFS_SHIFT - MM_RAM_FLAGS_IDX_SHIFT)) | pShwPage->idx; } else u16 = pgmPoolTrackPhysExtAddref(pVM, u16, pShwPage->idx); /* write back, trying to be clever... */ Log2(("SyncPageWorkerTrackAddRef: u16=%#x pPage->HCPhys=%VHp->%VHp iPTDst=%#x\n", u16, pPage->HCPhys, (pPage->HCPhys & MM_RAM_FLAGS_NO_REFS_MASK) | ((uint64_t)u16 << MM_RAM_FLAGS_CREFS_SHIFT), iPTDst)); *((uint16_t *)&pPage->HCPhys + 3) = u16; /** @todo PAGE FLAGS */ # endif /* PGMPOOL_WITH_GCPHYS_TRACKING */ /* update statistics. */ pVM->pgm.s.CTXSUFF(pPool)->cPresent++; pShwPage->cPresent++; if (pShwPage->iFirstPresent > iPTDst) pShwPage->iFirstPresent = iPTDst; } #endif /* PGMPOOL_WITH_USER_TRACKING */ /** * Creates a 4K shadow page for a guest page. * * For 4M pages the caller must convert the PDE4M to a PTE, this includes adjusting the * physical address. The PdeSrc argument only the flags are used. No page structured * will be mapped in this function. * * @param pVM VM handle. * @param pPteDst Destination page table entry. * @param PdeSrc Source page directory entry (i.e. Guest OS page directory entry). * Can safely assume that only the flags are being used. * @param PteSrc Source page table entry (i.e. Guest OS page table entry). * @param pShwPage Pointer to the shadow page. * @param iPTDst The index into the shadow table. * * @remark Not used for 2/4MB pages! */ DECLINLINE(void) PGM_BTH_NAME(SyncPageWorker)(PVM pVM, PSHWPTE pPteDst, GSTPDE PdeSrc, GSTPTE PteSrc, PPGMPOOLPAGE pShwPage, unsigned iPTDst) { if (PteSrc.n.u1Present) { /* * Find the ram range. */ PPGMPAGE pPage; int rc = pgmPhysGetPageEx(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK, &pPage); if (VBOX_SUCCESS(rc)) { /** @todo investiage PWT, PCD and PAT. */ /* * Make page table entry. */ const RTHCPHYS HCPhys = pPage->HCPhys; /** @todo FLAGS */ SHWPTE PteDst; if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage)) { /** @todo r=bird: Are we actually handling dirty and access bits for pages with access handlers correctly? No. */ if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)) PteDst.u = (PteSrc.u & ~(X86_PTE_PAE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT | X86_PTE_RW)) | (HCPhys & X86_PTE_PAE_PG_MASK); else { LogFlow(("SyncPageWorker: monitored page (%VGp) -> mark not present\n", HCPhys)); PteDst.u = 0; } /** @todo count these two kinds. */ } else { #ifdef PGM_SYNC_DIRTY_BIT # ifdef PGM_SYNC_ACCESSED_BIT /* * If the page or page directory entry is not marked accessed, * we mark the page not present. */ if (!PteSrc.n.u1Accessed || !PdeSrc.n.u1Accessed) { LogFlow(("SyncPageWorker: page and or page directory not accessed -> mark not present\n")); STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,AccessedPage)); PteDst.u = 0; } else # endif /* * If the page is not flagged as dirty and is writable, then make it read-only, so we can set the dirty bit * when the page is modified. */ if (!PteSrc.n.u1Dirty && (PdeSrc.n.u1Write & PteSrc.n.u1Write)) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPage)); PteDst.u = (PteSrc.u & ~(X86_PTE_PAE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT | X86_PTE_RW)) | (HCPhys & X86_PTE_PAE_PG_MASK) | PGM_PTFLAGS_TRACK_DIRTY; } else { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageSkipped)); PteDst.u = (PteSrc.u & ~(X86_PTE_PAE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | (HCPhys & X86_PTE_PAE_PG_MASK); } #endif } #ifdef PGMPOOL_WITH_USER_TRACKING /* * Keep user track up to date. */ if (PteDst.n.u1Present) { if (!pPteDst->n.u1Present) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst); else if ((pPteDst->u & SHW_PTE_PG_MASK) != (PteDst.u & SHW_PTE_PG_MASK)) { Log2(("SyncPageWorker: deref! *pPteDst=%RX64 PteDst=%RX64\n", (uint64_t)pPteDst->u, (uint64_t)PteDst.u)); PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK); PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst); } } else if (pPteDst->n.u1Present) { Log2(("SyncPageWorker: deref! *pPteDst=%RX64\n", (uint64_t)pPteDst->u)); PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK); } #endif /* PGMPOOL_WITH_USER_TRACKING */ /* * Update statistics and commit the entry. */ if (!PteSrc.n.u1Global) pShwPage->fSeenNonGlobal = true; *pPteDst = PteDst; } /* else MMIO or invalid page, we must handle them manually in the #PF handler. */ /** @todo count these. */ } else { /* * Page not-present. */ LogFlow(("SyncPageWorker: page not present in Pte\n")); #ifdef PGMPOOL_WITH_USER_TRACKING /* Keep user track up to date. */ if (pPteDst->n.u1Present) { Log2(("SyncPageWorker: deref! *pPteDst=%RX64\n", (uint64_t)pPteDst->u)); PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK); } #endif /* PGMPOOL_WITH_USER_TRACKING */ pPteDst->u = 0; /** @todo count these. */ } } /** * Syncs a guest OS page. * * There are no conflicts at this point, neither is there any need for * page table allocations. * * @returns VBox status code. * @returns VINF_PGM_SYNCPAGE_MODIFIED_PDE if it modifies the PDE in any way. * @param pVM VM handle. * @param PdeSrc Page directory entry of the guest. * @param GCPtrPage Guest context page address. * @param cPages Number of pages to sync (PGM_SYNC_N_PAGES) (default=1). * @param uErr Fault error (X86_TRAP_PF_*). */ PGM_BTH_DECL(int, SyncPage)(PVM pVM, GSTPDE PdeSrc, RTGCUINTPTR GCPtrPage, unsigned cPages, unsigned uErr) { # if PGM_WITH_NX(PGM_GST_TYPE) bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE); # endif LogFlow(("SyncPage: GCPtrPage=%VGv cPages=%d uErr=%#x\n", GCPtrPage, cPages, uErr)); #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE /* * Assert preconditions. */ STAM_COUNTER_INC(&pVM->pgm.s.StatGCSyncPagePD[(GCPtrPage >> GST_PD_SHIFT) & GST_PD_MASK]); Assert(PdeSrc.n.u1Present); Assert(cPages); /* * Get the shadow PDE, find the shadow page table in the pool. */ const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT; # if PGM_SHW_TYPE == PGM_TYPE_32BIT X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst]; # else /* PAE */ X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst]; # endif Assert(PdeDst.n.u1Present); PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK); /* * Check that the page is present and that the shadow PDE isn't out of sync. */ const bool fBigPage = PdeSrc.b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE); RTGCPHYS GCPhys; if (!fBigPage) { GCPhys = PdeSrc.u & GST_PDE_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ GCPhys |= (iPDDst & 1) * (PAGE_SIZE/2); # endif } else { GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/ GCPhys |= GCPtrPage & (1 << X86_PD_PAE_SHIFT); # endif } if ( pShwPage->GCPhys == GCPhys && PdeSrc.n.u1Present && (PdeSrc.n.u1User == PdeDst.n.u1User) && (PdeSrc.n.u1Write == PdeDst.n.u1Write || !PdeDst.n.u1Write) # if PGM_WITH_NX(PGM_GST_TYPE) && (!fNoExecuteBitValid || PdeSrc.n.u1NoExecute == PdeDst.n.u1NoExecute) # endif ) { # ifdef PGM_SYNC_ACCESSED_BIT /* * Check that the PDE is marked accessed already. * Since we set the accessed bit *before* getting here on a #PF, this * check is only meant for dealing with non-#PF'ing paths. */ if (PdeSrc.n.u1Accessed) # endif { PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); if (!fBigPage) { /* * 4KB Page - Map the guest page table. */ PGSTPT pPTSrc; int rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { # ifdef PGM_SYNC_N_PAGES Assert(cPages == 1 || !(uErr & X86_TRAP_PF_P)); if (cPages > 1 && !(uErr & X86_TRAP_PF_P)) { /* * This code path is currently only taken when the caller is PGMTrap0eHandler * for non-present pages! * * We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and * deal with locality. */ unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512; # else const unsigned offPTSrc = 0; # endif const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a)); if (iPTDst < PGM_SYNC_NR_PAGES / 2) iPTDst = 0; else iPTDst -= PGM_SYNC_NR_PAGES / 2; for (; iPTDst < iPTDstEnd; iPTDst++) { if (!pPTDst->a[iPTDst].n.u1Present) { GSTPTE PteSrc = pPTSrc->a[offPTSrc + iPTDst]; RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) | ((offPTSrc + iPTDst) << PAGE_SHIFT); NOREF(GCPtrCurPage); #ifndef IN_RING0 /* * Assuming kernel code will be marked as supervisor - and not as user level * and executed using a conforming code selector - And marked as readonly. * Also assume that if we're monitoring a page, it's of no interest to CSAM. */ PPGMPAGE pPage; if ( ((PdeSrc.u & PteSrc.u) & (X86_PTE_RW | X86_PTE_US)) || iPTDst == ((GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK) /* always sync GCPtrPage */ || !CSAMDoesPageNeedScanning(pVM, (RTGCPTR)GCPtrCurPage) || ( (pPage = pgmPhysGetPage(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK)) && PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage)) ) #endif /* else: CSAM not active */ PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst); Log2(("SyncPage: 4K+ %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx%s\n", GCPtrCurPage, PteSrc.n.u1Present, PteSrc.n.u1Write & PdeSrc.n.u1Write, PteSrc.n.u1User & PdeSrc.n.u1User, (uint64_t)PteSrc.u, (uint64_t)pPTDst->a[iPTDst].u, pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); } } } else # endif /* PGM_SYNC_N_PAGES */ { const unsigned iPTSrc = (GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK; GSTPTE PteSrc = pPTSrc->a[iPTSrc]; const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst); Log2(("SyncPage: 4K %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s\n", GCPtrPage, PteSrc.n.u1Present, PteSrc.n.u1Write & PdeSrc.n.u1Write, PteSrc.n.u1User & PdeSrc.n.u1User, (uint64_t)PteSrc.u, pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); } } else /* MMIO or invalid page: emulated in #PF handler. */ { LogFlow(("PGM_GCPHYS_2_PTR %VGp failed with %Vrc\n", GCPhys, rc)); Assert(!pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK].n.u1Present); } } else { /* * 4/2MB page - lazy syncing shadow 4K pages. * (There are many causes of getting here, it's no longer only CSAM.) */ /* Calculate the GC physical address of this 4KB shadow page. */ RTGCPHYS GCPhys = (PdeSrc.u & GST_PDE_BIG_PG_MASK) | ((RTGCUINTPTR)GCPtrPage & GST_BIG_PAGE_OFFSET_MASK); /* Find ram range. */ PPGMPAGE pPage; int rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage); if (VBOX_SUCCESS(rc)) { /* * Make shadow PTE entry. */ const RTHCPHYS HCPhys = pPage->HCPhys; /** @todo PAGE FLAGS */ SHWPTE PteDst; PteDst.u = (PdeSrc.u & ~(X86_PTE_PAE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | (HCPhys & X86_PTE_PAE_PG_MASK); if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage)) { if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)) PteDst.n.u1Write = 0; else PteDst.u = 0; } const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; # ifdef PGMPOOL_WITH_USER_TRACKING if (PteDst.n.u1Present && !pPTDst->a[iPTDst].n.u1Present) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst); # endif pPTDst->a[iPTDst] = PteDst; # ifdef PGM_SYNC_DIRTY_BIT /* * If the page is not flagged as dirty and is writable, then make it read-only * at PD level, so we can set the dirty bit when the page is modified. * * ASSUMES that page access handlers are implemented on page table entry level. * Thus we will first catch the dirty access and set PDE.D and restart. If * there is an access handler, we'll trap again and let it work on the problem. */ /** @todo r=bird: figure out why we need this here, SyncPT should've taken care of this already. * As for invlpg, it simply frees the whole shadow PT. * ...It's possibly because the guest clears it and the guest doesn't really tell us... */ if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig)); PdeDst.u |= PGM_PDFLAGS_TRACK_DIRTY; PdeDst.n.u1Write = 0; } else { PdeDst.au32[0] &= ~PGM_PDFLAGS_TRACK_DIRTY; PdeDst.n.u1Write = PdeSrc.n.u1Write; } # if PGM_SHW_TYPE == PGM_TYPE_32BIT pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst] = PdeDst; # else /* PAE */ pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst] = PdeDst; # endif # endif /* PGM_SYNC_DIRTY_BIT */ Log2(("SyncPage: BIG %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} GCPhys=%VGp%s\n", GCPtrPage, PdeSrc.n.u1Present, PdeSrc.n.u1Write, PdeSrc.n.u1User, (uint64_t)PdeSrc.u, GCPhys, PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); } else LogFlow(("PGM_GCPHYS_2_PTR %VGp (big) failed with %Vrc\n", GCPhys, rc)); } return VINF_SUCCESS; } # ifdef PGM_SYNC_ACCESSED_BIT STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPagePDNAs)); #endif } else { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPagePDOutOfSync)); Log2(("SyncPage: Out-Of-Sync PDE at %VGp PdeSrc=%RX64 PdeDst=%RX64\n", GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); } /* * Mark the PDE not present. Restart the instruction and let #PF call SyncPT. * Yea, I'm lazy. */ pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst); # if PGM_SHW_TYPE == PGM_TYPE_32BIT pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst].u = 0; # else /* PAE */ pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst].u = 0; # endif PGM_INVL_GUEST_TLBS(); return VINF_PGM_SYNCPAGE_MODIFIED_PDE; #elif PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT # ifdef PGM_SYNC_N_PAGES /* * Get the shadow PDE, find the shadow page table in the pool. */ const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT; # if PGM_SHW_TYPE == PGM_TYPE_32BIT X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst]; # else /* PAE */ X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst]; # endif Assert(PdeDst.n.u1Present); PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK); PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); # if PGM_SHW_TYPE == PGM_TYPE_PAE /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512; # else const unsigned offPTSrc = 0; # endif Assert(cPages == 1 || !(uErr & X86_TRAP_PF_P)); if (cPages > 1 && !(uErr & X86_TRAP_PF_P)) { /* * This code path is currently only taken when the caller is PGMTrap0eHandler * for non-present pages! * * We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and * deal with locality. */ unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a)); if (iPTDst < PGM_SYNC_NR_PAGES / 2) iPTDst = 0; else iPTDst -= PGM_SYNC_NR_PAGES / 2; for (; iPTDst < iPTDstEnd; iPTDst++) { if (!pPTDst->a[iPTDst].n.u1Present) { GSTPTE PteSrc; RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) | ((offPTSrc + iPTDst) << PAGE_SHIFT); /* Fake the page table entry */ PteSrc.u = GCPtrCurPage; PteSrc.n.u1Present = 1; PteSrc.n.u1Dirty = 1; PteSrc.n.u1Accessed = 1; PteSrc.n.u1Write = 1; PteSrc.n.u1User = 1; PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst); Log2(("SyncPage: 4K+ %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx%s\n", GCPtrCurPage, PteSrc.n.u1Present, PteSrc.n.u1Write & PdeSrc.n.u1Write, PteSrc.n.u1User & PdeSrc.n.u1User, (uint64_t)PteSrc.u, (uint64_t)pPTDst->a[iPTDst].u, pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); } } } else # endif /* PGM_SYNC_N_PAGES */ { GSTPTE PteSrc; const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) | ((offPTSrc + iPTDst) << PAGE_SHIFT); /* Fake the page table entry */ PteSrc.u = GCPtrCurPage; PteSrc.n.u1Present = 1; PteSrc.n.u1Dirty = 1; PteSrc.n.u1Accessed = 1; PteSrc.n.u1Write = 1; PteSrc.n.u1User = 1; PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst); Log2(("SyncPage: 4K %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s\n", GCPtrPage, PteSrc.n.u1Present, PteSrc.n.u1Write & PdeSrc.n.u1Write, PteSrc.n.u1User & PdeSrc.n.u1User, (uint64_t)PteSrc.u, pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); } return VINF_SUCCESS; #else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE)); return VERR_INTERNAL_ERROR; #endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ } #if PGM_WITH_PAGING(PGM_GST_TYPE) # ifdef PGM_SYNC_DIRTY_BIT /** * Investigate page fault and handle write protection page faults caused by * dirty bit tracking. * * @returns VBox status code. * @param pVM VM handle. * @param uErr Page fault error code. * @param pPdeDst Shadow page directory entry. * @param pPdeSrc Guest page directory entry. * @param GCPtrPage Guest context page address. */ PGM_BTH_DECL(int, CheckPageFault)(PVM pVM, uint32_t uErr, PSHWPDE pPdeDst, PGSTPDE pPdeSrc, RTGCUINTPTR GCPtrPage) { bool fWriteProtect = !!(CPUMGetGuestCR0(pVM) & X86_CR0_WP); bool fUserLevelFault = !!(uErr & X86_TRAP_PF_US); bool fWriteFault = !!(uErr & X86_TRAP_PF_RW); # if PGM_WITH_NX(PGM_GST_TYPE) bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE); # endif STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a); LogFlow(("CheckPageFault: GCPtrPage=%VGv uErr=%#x PdeSrc=%08x\n", GCPtrPage, uErr, pPdeSrc->u)); # if PGM_GST_TYPE == PGM_TYPE_AMD64 AssertFailed(); # elif PGM_GST_TYPE == PGM_TYPE_PAE PX86PDPE pPdpeSrc = &pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[(GCPtrPage >> GST_PDPT_SHIFT) & GST_PDPT_MASK]; /* * Real page fault? */ if ( (uErr & X86_TRAP_PF_RSVD) || !pPdpeSrc->n.u1Present # if PGM_GST_TYPE == PGM_TYPE_AMD64 /* NX, r/w, u/s bits in the PDPE are long mode only */ || (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && pPdpeSrc->n.u1NoExecute) || (fWriteFault && !pPdpeSrc->n.u1Write && (fUserLevelFault || fWriteProtect)) || (fUserLevelFault && !pPdpeSrc->n.u1User) # endif ) { # ifdef IN_GC STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF); # endif STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a); LogFlow(("CheckPageFault: real page fault at %VGv (0)\n", GCPtrPage)); if ( pPdpeSrc->n.u1Present && pPdeSrc->n.u1Present) { /* Check the present bit as the shadow tables can cause different error codes by being out of sync. * See the 2nd case below as well. */ if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE)) { TRPMSetErrorCode(pVM, uErr | X86_TRAP_PF_P); /* page-level protection violation */ } else { /* * Map the guest page table. */ PGSTPT pPTSrc; int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK]; const GSTPTE PteSrc = *pPteSrc; if (pPteSrc->n.u1Present) TRPMSetErrorCode(pVM, uErr | X86_TRAP_PF_P); /* page-level protection violation */ } AssertRC(rc); } } return VINF_EM_RAW_GUEST_TRAP; } # endif /* * Real page fault? */ if ( (uErr & X86_TRAP_PF_RSVD) || !pPdeSrc->n.u1Present # if PGM_WITH_NX(PGM_GST_TYPE) || (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && pPdeSrc->n.u1NoExecute) # endif || (fWriteFault && !pPdeSrc->n.u1Write && (fUserLevelFault || fWriteProtect)) || (fUserLevelFault && !pPdeSrc->n.u1User) ) { # ifdef IN_GC STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF); # endif STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a); LogFlow(("CheckPageFault: real page fault at %VGv (1)\n", GCPtrPage)); if (pPdeSrc->n.u1Present) { /* Check the present bit as the shadow tables can cause different error codes by being out of sync. * See the 2nd case below as well. */ if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE)) { TRPMSetErrorCode(pVM, uErr | X86_TRAP_PF_P); /* page-level protection violation */ } else { /* * Map the guest page table. */ PGSTPT pPTSrc; int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK]; const GSTPTE PteSrc = *pPteSrc; if (pPteSrc->n.u1Present) TRPMSetErrorCode(pVM, uErr | X86_TRAP_PF_P); /* page-level protection violation */ } AssertRC(rc); } } return VINF_EM_RAW_GUEST_TRAP; } /* * First check the easy case where the page directory has been marked read-only to track * the dirty bit of an emulated BIG page */ if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE)) { /* Mark guest page directory as accessed */ pPdeSrc->b.u1Accessed = 1; /* * Only write protection page faults are relevant here. */ if (fWriteFault) { /* Mark guest page directory as dirty (BIG page only). */ pPdeSrc->b.u1Dirty = 1; if (pPdeDst->n.u1Present && (pPdeDst->u & PGM_PDFLAGS_TRACK_DIRTY)) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageTrap)); Assert(pPdeSrc->b.u1Write); pPdeDst->n.u1Write = 1; pPdeDst->n.u1Accessed = 1; pPdeDst->au32[0] &= ~PGM_PDFLAGS_TRACK_DIRTY; PGM_INVL_BIG_PG(GCPtrPage); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; } } STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_PGM_NO_DIRTY_BIT_TRACKING; } /* else: 4KB page table */ /* * Map the guest page table. */ PGSTPT pPTSrc; int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { /* * Real page fault? */ PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK]; const GSTPTE PteSrc = *pPteSrc; if ( !PteSrc.n.u1Present # if PGM_WITH_NX(PGM_GST_TYPE) || (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && PteSrc.n.u1NoExecute) # endif || (fWriteFault && !PteSrc.n.u1Write && (fUserLevelFault || fWriteProtect)) || (fUserLevelFault && !PteSrc.n.u1User) ) { # ifdef IN_GC STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF); # endif STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); LogFlow(("CheckPageFault: real page fault at %VGv PteSrc.u=%08x (2)\n", GCPtrPage, PteSrc.u)); /* Check the present bit as the shadow tables can cause different error codes by being out of sync. * See the 2nd case above as well. */ if (pPdeSrc->n.u1Present && pPteSrc->n.u1Present) TRPMSetErrorCode(pVM, uErr | X86_TRAP_PF_P); /* page-level protection violation */ STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_EM_RAW_GUEST_TRAP; } LogFlow(("CheckPageFault: page fault at %VGv PteSrc.u=%08x\n", GCPtrPage, PteSrc.u)); /* * Set the accessed bits in the page directory and the page table. */ pPdeSrc->n.u1Accessed = 1; pPteSrc->n.u1Accessed = 1; /* * Only write protection page faults are relevant here. */ if (fWriteFault) { /* Write access, so mark guest entry as dirty. */ # if defined(IN_GC) && defined(VBOX_WITH_STATISTICS) if (!pPteSrc->n.u1Dirty) STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtiedPage); else STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageAlreadyDirty); # endif pPteSrc->n.u1Dirty = 1; if (pPdeDst->n.u1Present) { /* Bail out here as pgmPoolGetPageByHCPhys will return NULL and we'll crash below. * Our individual shadow handlers will provide more information and force a fatal exit. */ if (MMHyperIsInsideArea(pVM, (RTGCPTR)GCPtrPage)) { LogRel(("CheckPageFault: write to hypervisor region %VGv\n", GCPtrPage)); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_SUCCESS; } /* * Map shadow page table. */ PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, pPdeDst->u & SHW_PDE_PG_MASK); if (pShwPage) { PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK]; if ( pPteDst->n.u1Present /** @todo Optimize accessed bit emulation? */ && (pPteDst->u & PGM_PTFLAGS_TRACK_DIRTY)) { LogFlow(("DIRTY page trap addr=%VGv\n", GCPtrPage)); # ifdef VBOX_STRICT PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, pPteSrc->u & GST_PTE_PG_MASK); if (pPage) AssertMsg(!PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage), ("Unexpected dirty bit tracking on monitored page %VGv (phys %VGp)!!!!!!\n", GCPtrPage, pPteSrc->u & X86_PTE_PAE_PG_MASK)); # endif STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageTrap)); Assert(pPteSrc->n.u1Write); pPteDst->n.u1Write = 1; pPteDst->n.u1Dirty = 1; pPteDst->n.u1Accessed = 1; pPteDst->au32[0] &= ~PGM_PTFLAGS_TRACK_DIRTY; PGM_INVL_PG(GCPtrPage); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; } } else AssertMsgFailed(("pgmPoolGetPageByHCPhys %VGp failed!\n", pPdeDst->u & SHW_PDE_PG_MASK)); } } /** @todo Optimize accessed bit emulation? */ # ifdef VBOX_STRICT /* * Sanity check. */ else if ( !pPteSrc->n.u1Dirty && (pPdeSrc->n.u1Write & pPteSrc->n.u1Write) && pPdeDst->n.u1Present) { PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, pPdeDst->u & SHW_PDE_PG_MASK); PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK]; if ( pPteDst->n.u1Present && pPteDst->n.u1Write) LogFlow(("Writable present page %VGv not marked for dirty bit tracking!!!\n", GCPtrPage)); } # endif /* VBOX_STRICT */ STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return VINF_PGM_NO_DIRTY_BIT_TRACKING; } AssertRC(rc); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a); return rc; } # endif #endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ /** * Sync a shadow page table. * * The shadow page table is not present. This includes the case where * there is a conflict with a mapping. * * @returns VBox status code. * @param pVM VM handle. * @param iPD Page directory index. * @param pPDSrc Source page directory (i.e. Guest OS page directory). * Assume this is a temporary mapping. * @param GCPtrPage GC Pointer of the page that caused the fault */ PGM_BTH_DECL(int, SyncPT)(PVM pVM, unsigned iPDSrc, PGSTPD pPDSrc, RTGCUINTPTR GCPtrPage) { STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); STAM_COUNTER_INC(&pVM->pgm.s.StatGCSyncPtPD[iPDSrc]); LogFlow(("SyncPT: GCPtrPage=%VGv\n", GCPtrPage)); #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE /* * Validate input a little bit. */ AssertMsg(iPDSrc == ((GCPtrPage >> GST_PD_SHIFT) & GST_PD_MASK), ("iPDSrc=%x GCPtrPage=%VGv\n", iPDSrc, GCPtrPage)); # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD); # else PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]; # endif const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT; PSHWPDE pPdeDst = &pPDDst->a[iPDDst]; SHWPDE PdeDst = *pPdeDst; # ifndef PGM_WITHOUT_MAPPINGS /* * Check for conflicts. * GC: In case of a conflict we'll go to Ring-3 and do a full SyncCR3. * HC: Simply resolve the conflict. */ if (PdeDst.u & PGM_PDFLAGS_MAPPING) { Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s)); # ifndef IN_RING3 Log(("SyncPT: Conflict at %VGv\n", GCPtrPage)); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); return VERR_ADDRESS_CONFLICT; # else PPGMMAPPING pMapping = pgmGetMapping(pVM, (RTGCPTR)GCPtrPage); Assert(pMapping); # if PGM_GST_TYPE == PGM_TYPE_32BIT int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, GCPtrPage & (GST_PD_MASK << GST_PD_SHIFT)); # elif PGM_GST_TYPE == PGM_TYPE_PAE int rc = pgmR3SyncPTResolveConflictPAE(pVM, pMapping, GCPtrPage & (GST_PD_MASK << GST_PD_SHIFT)); # endif if (VBOX_FAILURE(rc)) { STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); return rc; } PdeDst = *pPdeDst; # endif } # else /* PGM_WITHOUT_MAPPINGS */ Assert(!pgmMapAreMappingsEnabled(&pVM->pgm.s)); # endif /* !PGM_WITHOUT_MAPPINGS */ Assert(!PdeDst.n.u1Present); /* We're only supposed to call SyncPT on PDE!P and conflicts.*/ /* * Sync page directory entry. */ int rc = VINF_SUCCESS; GSTPDE PdeSrc = pPDSrc->a[iPDSrc]; if (PdeSrc.n.u1Present) { /* * Allocate & map the page table. */ PSHWPT pPTDst; const bool fPageTable = !PdeSrc.b.u1Size || !(CPUMGetGuestCR4(pVM) & X86_CR4_PSE); PPGMPOOLPAGE pShwPage; RTGCPHYS GCPhys; if (fPageTable) { GCPhys = PdeSrc.u & GST_PDE_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ GCPhys |= (iPDDst & 1) * (PAGE_SIZE / 2); # endif rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_PT, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage); } else { GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/ GCPhys |= GCPtrPage & (1 << X86_PD_PAE_SHIFT); # endif rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_BIG, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage); } if (rc == VINF_SUCCESS) pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); else if (rc == VINF_PGM_CACHED_PAGE) { /* * The PT was cached, just hook it up. */ if (fPageTable) PdeDst.u = pShwPage->Core.Key | (PdeSrc.u & ~(GST_PDE_PG_MASK | X86_PDE_AVL_MASK | X86_PDE_PCD | X86_PDE_PWT | X86_PDE_PS | X86_PDE4M_G | X86_PDE4M_D)); else { PdeDst.u = pShwPage->Core.Key | (PdeSrc.u & ~(GST_PDE_PG_MASK | X86_PDE_AVL_MASK | X86_PDE_PCD | X86_PDE_PWT | X86_PDE_PS | X86_PDE4M_G | X86_PDE4M_D)); # ifdef PGM_SYNC_DIRTY_BIT /* (see explanation and assumptions further down.) */ if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig)); PdeDst.u |= PGM_PDFLAGS_TRACK_DIRTY; PdeDst.b.u1Write = 0; } # endif } *pPdeDst = PdeDst; return VINF_SUCCESS; } else if (rc == VERR_PGM_POOL_FLUSHED) return VINF_PGM_SYNC_CR3; else AssertMsgFailedReturn(("rc=%Vrc\n", rc), VERR_INTERNAL_ERROR); PdeDst.u &= X86_PDE_AVL_MASK; PdeDst.u |= pShwPage->Core.Key; # ifdef PGM_SYNC_DIRTY_BIT /* * Page directory has been accessed (this is a fault situation, remember). */ pPDSrc->a[iPDSrc].n.u1Accessed = 1; # endif if (fPageTable) { /* * Page table - 4KB. * * Sync all or just a few entries depending on PGM_SYNC_N_PAGES. */ Log2(("SyncPT: 4K %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx}\n", GCPtrPage, PdeSrc.b.u1Present, PdeSrc.b.u1Write, PdeSrc.b.u1User, (uint64_t)PdeSrc.u)); PGSTPT pPTSrc; rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc); if (VBOX_SUCCESS(rc)) { /* * Start by syncing the page directory entry so CSAM's TLB trick works. */ PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK | X86_PDE_AVL_MASK)) | (PdeSrc.u & ~(GST_PDE_PG_MASK | X86_PDE_AVL_MASK | X86_PDE_PCD | X86_PDE_PWT | X86_PDE_PS | X86_PDE4M_G | X86_PDE4M_D)); *pPdeDst = PdeDst; /* * Directory/page user or supervisor privilege: (same goes for read/write) * * Directory Page Combined * U/S U/S U/S * 0 0 0 * 0 1 0 * 1 0 0 * 1 1 1 * * Simple AND operation. Table listed for completeness. * */ STAM_COUNTER_INC(CTXSUFF(&pVM->pgm.s.StatSynPT4k)); # ifdef PGM_SYNC_N_PAGES unsigned iPTBase = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK; unsigned iPTDst = iPTBase; const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a)); if (iPTDst <= PGM_SYNC_NR_PAGES / 2) iPTDst = 0; else iPTDst -= PGM_SYNC_NR_PAGES / 2; # else /* !PGM_SYNC_N_PAGES */ unsigned iPTDst = 0; const unsigned iPTDstEnd = ELEMENTS(pPTDst->a); # endif /* !PGM_SYNC_N_PAGES */ # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512; # else const unsigned offPTSrc = 0; # endif for (; iPTDst < iPTDstEnd; iPTDst++) { const unsigned iPTSrc = iPTDst + offPTSrc; const GSTPTE PteSrc = pPTSrc->a[iPTSrc]; if (PteSrc.n.u1Present) /* we've already cleared it above */ { # ifndef IN_RING0 /* * Assuming kernel code will be marked as supervisor - and not as user level * and executed using a conforming code selector - And marked as readonly. * Also assume that if we're monitoring a page, it's of no interest to CSAM. */ PPGMPAGE pPage; if ( ((PdeSrc.u & pPTSrc->a[iPTSrc].u) & (X86_PTE_RW | X86_PTE_US)) || !CSAMDoesPageNeedScanning(pVM, (RTGCPTR)((iPDSrc << GST_PD_SHIFT) | (iPTSrc << PAGE_SHIFT))) || ( (pPage = pgmPhysGetPage(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK)) && PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage)) ) # endif PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst); Log2(("SyncPT: 4K+ %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s dst.raw=%08llx iPTSrc=%x PdeSrc.u=%x physpte=%VGp\n", (RTGCPTR)((iPDSrc << GST_PD_SHIFT) | (iPTSrc << PAGE_SHIFT)), PteSrc.n.u1Present, PteSrc.n.u1Write & PdeSrc.n.u1Write, PteSrc.n.u1User & PdeSrc.n.u1User, (uint64_t)PteSrc.u, pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "", pPTDst->a[iPTDst].u, iPTSrc, PdeSrc.au32[0], (PdeSrc.u & GST_PDE_PG_MASK) + iPTSrc*sizeof(PteSrc))); } } /* for PTEs */ } } else { /* * Big page - 2/4MB. * * We'll walk the ram range list in parallel and optimize lookups. * We will only sync on shadow page table at a time. */ STAM_COUNTER_INC(CTXSUFF(&pVM->pgm.s.StatSynPT4M)); /** * @todo It might be more efficient to sync only a part of the 4MB page (similar to what we do for 4kb PDs). */ /* * Start by syncing the page directory entry. */ PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK | (X86_PDE_AVL_MASK & ~PGM_PDFLAGS_TRACK_DIRTY))) | (PdeSrc.u & ~(GST_PDE_PG_MASK | X86_PDE_AVL_MASK | X86_PDE_PCD | X86_PDE_PWT | X86_PDE_PS | X86_PDE4M_G | X86_PDE4M_D)); # ifdef PGM_SYNC_DIRTY_BIT /* * If the page is not flagged as dirty and is writable, then make it read-only * at PD level, so we can set the dirty bit when the page is modified. * * ASSUMES that page access handlers are implemented on page table entry level. * Thus we will first catch the dirty access and set PDE.D and restart. If * there is an access handler, we'll trap again and let it work on the problem. */ /** @todo move the above stuff to a section in the PGM documentation. */ Assert(!(PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)); if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write) { STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig)); PdeDst.u |= PGM_PDFLAGS_TRACK_DIRTY; PdeDst.b.u1Write = 0; } # endif /* PGM_SYNC_DIRTY_BIT */ *pPdeDst = PdeDst; /* * Fill the shadow page table. */ /* Get address and flags from the source PDE. */ SHWPTE PteDstBase; PteDstBase.u = PdeSrc.u & ~(GST_PDE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT); /* Loop thru the entries in the shadow PT. */ const RTGCUINTPTR GCPtr = (GCPtrPage >> SHW_PD_SHIFT) << SHW_PD_SHIFT; NOREF(GCPtr); Log2(("SyncPT: BIG %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} Shw=%VGv GCPhys=%VGp %s\n", GCPtrPage, PdeSrc.b.u1Present, PdeSrc.b.u1Write, PdeSrc.b.u1User, (uint64_t)PdeSrc.u, GCPtr, GCPhys, PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges); unsigned iPTDst = 0; while (iPTDst < ELEMENTS(pPTDst->a)) { /* Advance ram range list. */ while (pRam && GCPhys > pRam->GCPhysLast) pRam = CTXALLSUFF(pRam->pNext); if (pRam && GCPhys >= pRam->GCPhys) { unsigned iHCPage = (GCPhys - pRam->GCPhys) >> PAGE_SHIFT; do { /* Make shadow PTE. */ PPGMPAGE pPage = &pRam->aPages[iHCPage]; SHWPTE PteDst; /* Make sure the RAM has already been allocated. */ if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC) /** @todo PAGE FLAGS */ { if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage))) { # ifdef IN_RING3 int rc = pgmr3PhysGrowRange(pVM, GCPhys); # else int rc = CTXALLMID(VMM, CallHost)(pVM, VMMCALLHOST_PGM_RAM_GROW_RANGE, GCPhys); # endif if (rc != VINF_SUCCESS) return rc; } } if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage)) { if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)) { PteDst.u = PGM_PAGE_GET_HCPHYS(pPage) | PteDstBase.u; PteDst.n.u1Write = 0; } else PteDst.u = 0; } # ifndef IN_RING0 /* * Assuming kernel code will be marked as supervisor and not as user level and executed * using a conforming code selector. Don't check for readonly, as that implies the whole * 4MB can be code or readonly data. Linux enables write access for its large pages. */ else if ( !PdeSrc.n.u1User && CSAMDoesPageNeedScanning(pVM, (RTGCPTR)(GCPtr | (iPTDst << SHW_PT_SHIFT)))) PteDst.u = 0; # endif else PteDst.u = PGM_PAGE_GET_HCPHYS(pPage) | PteDstBase.u; # ifdef PGMPOOL_WITH_USER_TRACKING if (PteDst.n.u1Present) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, pPage->HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst); /** @todo PAGE FLAGS */ # endif /* commit it */ pPTDst->a[iPTDst] = PteDst; Log4(("SyncPT: BIG %VGv PteDst:{P=%d RW=%d U=%d raw=%08llx}%s\n", (RTGCPTR)(GCPtr | (iPTDst << SHW_PT_SHIFT)), PteDst.n.u1Present, PteDst.n.u1Write, PteDst.n.u1User, (uint64_t)PteDst.u, PteDst.u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "")); /* advance */ GCPhys += PAGE_SIZE; iHCPage++; iPTDst++; } while ( iPTDst < ELEMENTS(pPTDst->a) && GCPhys <= pRam->GCPhysLast); } else if (pRam) { Log(("Invalid pages at %VGp\n", GCPhys)); do { pPTDst->a[iPTDst].u = 0; /* MMIO or invalid page, we must handle them manually. */ GCPhys += PAGE_SIZE; iPTDst++; } while ( iPTDst < ELEMENTS(pPTDst->a) && GCPhys < pRam->GCPhys); } else { Log(("Invalid pages at %VGp (2)\n", GCPhys)); for ( ; iPTDst < ELEMENTS(pPTDst->a); iPTDst++) pPTDst->a[iPTDst].u = 0; /* MMIO or invalid page, we must handle them manually. */ } } /* while more PTEs */ } /* 4KB / 4MB */ } else AssertRelease(!PdeDst.n.u1Present); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); # ifdef IN_GC if (VBOX_FAILURE(rc)) STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPTFailed)); # endif return rc; #elif PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT int rc = VINF_SUCCESS; /* * Validate input a little bit. */ # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD); # else PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]; # endif const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT; PSHWPDE pPdeDst = &pPDDst->a[iPDDst]; SHWPDE PdeDst = *pPdeDst; Assert(!(PdeDst.u & PGM_PDFLAGS_MAPPING)); Assert(!PdeDst.n.u1Present); /* We're only supposed to call SyncPT on PDE!P and conflicts.*/ GSTPDE PdeSrc; PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */ PdeSrc.n.u1Present = 1; PdeSrc.n.u1Write = 1; PdeSrc.n.u1Accessed = 1; PdeSrc.n.u1User = 1; /* * Allocate & map the page table. */ PSHWPT pPTDst; PPGMPOOLPAGE pShwPage; RTGCPHYS GCPhys; /* Virtual address = physical address */ GCPhys = GCPtrPage & X86_PAGE_4K_BASE_MASK_32; rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_PT, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage); if ( rc == VINF_SUCCESS || rc == VINF_PGM_CACHED_PAGE) pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage); else AssertMsgFailedReturn(("rc=%Vrc\n", rc), VERR_INTERNAL_ERROR); PdeDst.u &= X86_PDE_AVL_MASK; PdeDst.u |= pShwPage->Core.Key; PdeDst.n.u1Present = 1; *pPdeDst = PdeDst; rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)GCPtrPage, PGM_SYNC_NR_PAGES, 0 /* page not present */); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); return rc; #else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE)); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a); return VERR_INTERNAL_ERROR; #endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ } /** * Prefetch a page/set of pages. * * Typically used to sync commonly used pages before entering raw mode * after a CR3 reload. * * @returns VBox status code. * @param pVM VM handle. * @param GCPtrPage Page to invalidate. */ PGM_BTH_DECL(int, PrefetchPage)(PVM pVM, RTGCUINTPTR GCPtrPage) { #if (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT || PGM_GST_TYPE == PGM_TYPE_PAE) && PGM_SHW_TYPE != PGM_TYPE_AMD64 /* * Check that all Guest levels thru the PDE are present, getting the * PD and PDE in the processes. */ int rc = VINF_SUCCESS; # if PGM_WITH_PAGING(PGM_GST_TYPE) # if PGM_GST_TYPE == PGM_TYPE_32BIT const unsigned iPDSrc = (RTGCUINTPTR)GCPtrPage >> GST_PD_SHIFT; PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); # else /* PAE */ unsigned iPDSrc; PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc); if (!pPDSrc) return VINF_SUCCESS; /* not present */ # endif const GSTPDE PdeSrc = pPDSrc->a[iPDSrc]; # else PGSTPD pPDSrc = NULL; const unsigned iPDSrc = 0; GSTPDE PdeSrc; PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */ PdeSrc.n.u1Present = 1; PdeSrc.n.u1Write = 1; PdeSrc.n.u1Accessed = 1; PdeSrc.n.u1User = 1; # endif # ifdef PGM_SYNC_ACCESSED_BIT if (PdeSrc.n.u1Present && PdeSrc.n.u1Accessed) # else if (PdeSrc.n.u1Present) # endif { # if PGM_SHW_TYPE == PGM_TYPE_32BIT const X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[GCPtrPage >> SHW_PD_SHIFT]; # else const X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[GCPtrPage >> SHW_PD_SHIFT]; # endif if (!(PdeDst.u & PGM_PDFLAGS_MAPPING)) { if (!PdeDst.n.u1Present) /** r=bird: This guy will set the A bit on the PDE, probably harmless. */ rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage); else { /** @note We used to sync PGM_SYNC_NR_PAGES pages, which triggered assertions in CSAM, because * R/W attributes of nearby pages were reset. Not sure how that could happen. Anyway, it * makes no sense to prefetch more than one page. */ rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0); if (VBOX_SUCCESS(rc)) rc = VINF_SUCCESS; } } } return rc; #else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE)); return VERR_INTERNAL_ERROR; #endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */ } /** * Syncs a page during a PGMVerifyAccess() call. * * @returns VBox status code (informational included). * @param GCPtrPage The address of the page to sync. * @param fPage The effective guest page flags. * @param uErr The trap error code. */ PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVM pVM, RTGCUINTPTR GCPtrPage, unsigned fPage, unsigned uErr) { LogFlow(("VerifyAccessSyncPage: GCPtrPage=%VGv fPage=%#x uErr=%#x\n", GCPtrPage, fPage, uErr)); #if (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_REAL || PGM_GST_TYPE == PGM_TYPE_PROT || PGM_GST_TYPE == PGM_TYPE_PAE) && PGM_SHW_TYPE != PGM_TYPE_AMD64 # ifndef IN_RING0 if (!(fPage & X86_PTE_US)) { /* * Mark this page as safe. */ /** @todo not correct for pages that contain both code and data!! */ Log(("CSAMMarkPage %VGv; scanned=%d\n", GCPtrPage, true)); CSAMMarkPage(pVM, (RTGCPTR)GCPtrPage, true); } # endif /* * Get guest PD and index. */ # if PGM_WITH_PAGING(PGM_GST_TYPE) # if PGM_GST_TYPE == PGM_TYPE_32BIT const unsigned iPDSrc = (RTGCUINTPTR)GCPtrPage >> GST_PD_SHIFT; PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); # else /* PAE */ unsigned iPDSrc; PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc); if (pPDSrc) { Log(("PGMVerifyAccess: access violation for %VGv due to non-present PDPTR\n", GCPtrPage)); return VINF_EM_RAW_GUEST_TRAP; } # endif # else PGSTPD pPDSrc = NULL; const unsigned iPDSrc = 0; # endif int rc = VINF_SUCCESS; /* * First check if the shadow pd is present. */ # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PDE pPdeDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[GCPtrPage >> SHW_PD_SHIFT]; # else PX86PDEPAE pPdeDst = &pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[GCPtrPage >> SHW_PD_SHIFT]; # endif if (!pPdeDst->n.u1Present) { rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage); AssertRC(rc); if (rc != VINF_SUCCESS) return rc; } # if PGM_WITH_PAGING(PGM_GST_TYPE) /* Check for dirty bit fault */ rc = PGM_BTH_NAME(CheckPageFault)(pVM, uErr, pPdeDst, &pPDSrc->a[iPDSrc], GCPtrPage); if (rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT) Log(("PGMVerifyAccess: success (dirty)\n")); else { GSTPDE PdeSrc = pPDSrc->a[iPDSrc]; #else { GSTPDE PdeSrc; PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */ PdeSrc.n.u1Present = 1; PdeSrc.n.u1Write = 1; PdeSrc.n.u1Accessed = 1; PdeSrc.n.u1User = 1; #endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */ Assert(rc != VINF_EM_RAW_GUEST_TRAP); if (uErr & X86_TRAP_PF_US) STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser); else /* supervisor */ STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor); rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0); if (VBOX_SUCCESS(rc)) { /* Page was successfully synced */ Log2(("PGMVerifyAccess: success (sync)\n")); rc = VINF_SUCCESS; } else { Log(("PGMVerifyAccess: access violation for %VGv rc=%d\n", GCPtrPage, rc)); return VINF_EM_RAW_GUEST_TRAP; } } return rc; #else /* PGM_GST_TYPE != PGM_TYPE_32BIT */ AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE)); return VERR_INTERNAL_ERROR; #endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */ } #if PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE # if PGM_SHW_TYPE == PGM_TYPE_32BIT || PGM_SHW_TYPE == PGM_TYPE_PAE /** * Figures out which kind of shadow page this guest PDE warrants. * * @returns Shadow page kind. * @param pPdeSrc The guest PDE in question. * @param cr4 The current guest cr4 value. */ DECLINLINE(PGMPOOLKIND) PGM_BTH_NAME(CalcPageKind)(const GSTPDE *pPdeSrc, uint32_t cr4) { if (!pPdeSrc->n.u1Size || !(cr4 & X86_CR4_PSE)) return BTH_PGMPOOLKIND_PT_FOR_PT; //switch (pPdeSrc->u & (X86_PDE4M_RW | X86_PDE4M_US /*| X86_PDE4M_PAE_NX*/)) //{ // case 0: // return BTH_PGMPOOLKIND_PT_FOR_BIG_RO; // case X86_PDE4M_RW: // return BTH_PGMPOOLKIND_PT_FOR_BIG_RW; // case X86_PDE4M_US: // return BTH_PGMPOOLKIND_PT_FOR_BIG_US; // case X86_PDE4M_RW | X86_PDE4M_US: // return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_US; # if 0 // case X86_PDE4M_PAE_NX: // return BTH_PGMPOOLKIND_PT_FOR_BIG_NX; // case X86_PDE4M_RW | X86_PDE4M_PAE_NX: // return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_NX; // case X86_PDE4M_US | X86_PDE4M_PAE_NX: // return BTH_PGMPOOLKIND_PT_FOR_BIG_US_NX; // case X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PAE_NX: // return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_US_NX; # endif return BTH_PGMPOOLKIND_PT_FOR_BIG; //} } # endif #endif #undef MY_STAM_COUNTER_INC #define MY_STAM_COUNTER_INC(a) do { } while (0) /** * Syncs the paging hierarchy starting at CR3. * * @returns VBox status code, no specials. * @param pVM The virtual machine. * @param cr0 Guest context CR0 register * @param cr3 Guest context CR3 register * @param cr4 Guest context CR4 register * @param fGlobal Including global page directories or not */ PGM_BTH_DECL(int, SyncCR3)(PVM pVM, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal) { if (VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3)) fGlobal = true; /* Change this CR3 reload to be a global one. */ /* * Update page access handlers. * The virtual are always flushed, while the physical are only on demand. * WARNING: We are incorrectly not doing global flushing on Virtual Handler updates. We'll * have to look into that later because it will have a bad influence on the performance. * @note SvL: There's no need for that. Just invalidate the virtual range(s). * bird: Yes, but that won't work for aliases. */ /** @todo this MUST go away. See #1557. */ STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncCR3Handlers), h); PGM_GST_NAME(HandlerVirtualUpdate)(pVM, cr4); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncCR3Handlers), h); #ifdef PGMPOOL_WITH_MONITORING /* * When monitoring shadowed pages, we reset the modification counters on CR3 sync. * Occationally 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'. */ if (!(pVM->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)) pgmPoolMonitorModifiedClearAll(pVM); else { # ifdef IN_RING3 pVM->pgm.s.fSyncFlags &= ~PGM_SYNC_CLEAR_PGM_POOL; pgmPoolClearAll(pVM); # else LogFlow(("SyncCR3: PGM_SYNC_CLEAR_PGM_POOL is set -> VINF_PGM_SYNC_CR3\n")); return VINF_PGM_SYNC_CR3; # endif } #endif Assert(fGlobal || (cr4 & X86_CR4_PGE)); MY_STAM_COUNTER_INC(fGlobal ? &pVM->pgm.s.CTXMID(Stat,SyncCR3Global) : &pVM->pgm.s.CTXMID(Stat,SyncCR3NotGlobal)); #if PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE /* * Get page directory addresses. */ # if PGM_SHW_TYPE == PGM_TYPE_32BIT PX86PDE pPDEDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[0]; # else PX86PDEPAE pPDEDst = &pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[0]; # endif # if PGM_GST_TYPE == PGM_TYPE_32BIT PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); Assert(pPDSrc); # ifndef IN_GC Assert(MMPhysGCPhys2HCVirt(pVM, (RTGCPHYS)(cr3 & GST_CR3_PAGE_MASK), sizeof(*pPDSrc)) == pPDSrc); # endif # endif /* * Iterate the page directory. */ PPGMMAPPING pMapping; unsigned iPdNoMapping; const bool fRawR0Enabled = EMIsRawRing0Enabled(pVM); PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool); /* Only check mappings if they are supposed to be put into the shadow page table. */ if (pgmMapAreMappingsEnabled(&pVM->pgm.s)) { pMapping = pVM->pgm.s.CTXALLSUFF(pMappings); iPdNoMapping = (pMapping) ? (pMapping->GCPtr >> GST_PD_SHIFT) : ~0U; } else { pMapping = 0; iPdNoMapping = ~0U; } # if PGM_GST_TYPE == PGM_TYPE_PAE || PGM_GST_TYPE == PGM_TYPE_AMD64 for (unsigned iPDPTE = 0; iPDPTE < GST_PDPE_ENTRIES; iPDPTE++) { unsigned iPDSrc; # if PGM_SHW_TYPE == PGM_TYPE_PAE PX86PDPAE pPDPAE = pVM->pgm.s.CTXMID(ap,PaePDs)[0]; # else AssertFailed(); /* @todo */ PX86PDPE pPDPAE = pVM->pgm.s.CTXMID(ap,PaePDs)[iPDPTE * X86_PG_AMD64_ENTRIES]; # endif PX86PDEPAE pPDEDst = &pPDPAE->a[iPDPTE * X86_PG_PAE_ENTRIES]; PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, iPDPTE << X86_PDPT_SHIFT, &iPDSrc); if (pPDSrc == NULL) { /* PDPT not present */ if (pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present) { for (unsigned iPD = 0; iPD < ELEMENTS(pPDSrc->a); iPD++) { if (pPDEDst[iPD].n.u1Present) { pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, pPDEDst[iPD].u & SHW_PDE_PG_MASK), SHW_POOL_ROOT_IDX, iPDPTE * X86_PG_PAE_ENTRIES + iPD); pPDEDst[iPD].u = 0; } } } pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present = 0; continue; } # else /* PGM_GST_TYPE != PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_AMD64 */ { # endif /* PGM_GST_TYPE != PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_AMD64 */ for (unsigned iPD = 0; iPD < ELEMENTS(pPDSrc->a); iPD++) { # if PGM_SHW_TYPE == PGM_TYPE_32BIT Assert(&pVM->pgm.s.CTXMID(p,32BitPD)->a[iPD] == pPDEDst); # elif PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT Assert(&pVM->pgm.s.CTXMID(ap,PaePDs)[iPD * 2 / 512]->a[iPD * 2 % 512] == pPDEDst); # endif register GSTPDE PdeSrc = pPDSrc->a[iPD]; if ( PdeSrc.n.u1Present && (PdeSrc.n.u1User || fRawR0Enabled)) { # if (PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE) \ && !defined(PGM_WITHOUT_MAPPINGS) /* * Check for conflicts with GC mappings. */ # if PGM_GST_TYPE == PGM_TYPE_PAE if (iPD + iPDPTE * X86_PG_PAE_ENTRIES == iPdNoMapping) # else if (iPD == iPdNoMapping) # endif { if (pVM->pgm.s.fMappingsFixed) { /* It's fixed, just skip the mapping. */ const unsigned cPTs = pMapping->cb >> SHW_PD_SHIFT; iPD += cPTs - 1; pPDEDst += cPTs; pMapping = pMapping->CTXALLSUFF(pNext); iPdNoMapping = pMapping ? pMapping->GCPtr >> GST_PD_SHIFT : ~0U; continue; } # ifdef IN_RING3 # if PGM_GST_TYPE == PGM_TYPE_32BIT int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, iPD << GST_PD_SHIFT); # elif PGM_GST_TYPE == PGM_TYPE_PAE int rc = pgmR3SyncPTResolveConflictPAE(pVM, pMapping, (iPDPTE << GST_PDPT_SHIFT) + (iPD << GST_PD_SHIFT)); # endif if (VBOX_FAILURE(rc)) return rc; /* * Update iPdNoMapping and pMapping. */ pMapping = pVM->pgm.s.pMappingsR3; while (pMapping && pMapping->GCPtr < (iPD << GST_PD_SHIFT)) pMapping = pMapping->pNextR3; iPdNoMapping = pMapping ? pMapping->GCPtr >> GST_PD_SHIFT : ~0U; # else LogFlow(("SyncCR3: detected conflict -> VINF_PGM_SYNC_CR3\n")); return VINF_PGM_SYNC_CR3; # endif } # else /* PGM_GST_TYPE != PGM_TYPE_32BIT && PGM_GST_TYPE != PGM_TYPE_PAE && PGM_WITHOUT_MAPPINGS */ Assert(!pgmMapAreMappingsEnabled(&pVM->pgm.s)); # endif /* (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE) && !PGM_WITHOUT_MAPPINGS */ /* * Sync page directory entry. * * The current approach is to allocated the page table but to set * the entry to not-present and postpone the page table synching till * it's actually used. */ # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT for (unsigned i = 0, iPdShw = iPD * 2; i < 2; i++, iPdShw++) /* pray that the compiler unrolls this */ # elif PGM_GST_TYPE == PGM_TYPE_PAE || PGM_GST_TYPE == PGM_TYPE_AMD64 const unsigned iPdShw = iPD + iPDPTE * X86_PG_PAE_ENTRIES; NOREF(iPdShw); # else const unsigned iPdShw = iPD; NOREF(iPdShw); # endif { SHWPDE PdeDst = *pPDEDst; if (PdeDst.n.u1Present) { PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK); RTGCPHYS GCPhys; if ( !PdeSrc.b.u1Size || !(cr4 & X86_CR4_PSE)) { GCPhys = PdeSrc.u & GST_PDE_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ GCPhys |= i * (PAGE_SIZE / 2); # endif } else { GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/ GCPhys |= i * X86_PAGE_2M_SIZE; # endif } if ( pShwPage->GCPhys == GCPhys && pShwPage->enmKind == PGM_BTH_NAME(CalcPageKind)(&PdeSrc, cr4) && ( pShwPage->fCached || ( !fGlobal && ( false # ifdef PGM_SKIP_GLOBAL_PAGEDIRS_ON_NONGLOBAL_FLUSH || ( (PdeSrc.u & (X86_PDE4M_PS | X86_PDE4M_G)) == (X86_PDE4M_PS | X86_PDE4M_G) && (cr4 & (X86_CR4_PGE | X86_CR4_PSE)) == (X86_CR4_PGE | X86_CR4_PSE)) /* global 2/4MB page. */ || ( !pShwPage->fSeenNonGlobal && (cr4 & X86_CR4_PGE)) # endif ) ) ) && ( (PdeSrc.u & (X86_PDE_US | X86_PDE_RW)) == (PdeDst.u & (X86_PDE_US | X86_PDE_RW)) || ( (cr4 & X86_CR4_PSE) && ((PdeSrc.u & (X86_PDE_US | X86_PDE4M_PS | X86_PDE4M_D)) | PGM_PDFLAGS_TRACK_DIRTY) == ((PdeDst.u & (X86_PDE_US | X86_PDE_RW | PGM_PDFLAGS_TRACK_DIRTY)) | X86_PDE4M_PS)) ) ) { # ifdef VBOX_WITH_STATISTICS if ( !fGlobal && (PdeSrc.u & (X86_PDE4M_PS | X86_PDE4M_G)) == (X86_PDE4M_PS | X86_PDE4M_G) && (cr4 & (X86_CR4_PGE | X86_CR4_PSE)) == (X86_CR4_PGE | X86_CR4_PSE)) MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstSkippedGlobalPD)); else if (!fGlobal && !pShwPage->fSeenNonGlobal && (cr4 & X86_CR4_PGE)) MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstSkippedGlobalPT)); else MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstCacheHit)); # endif /* VBOX_WITH_STATISTICS */ /** @todo a replacement strategy isn't really needed unless we're using a very small pool < 512 pages. * The whole ageing stuff should be put in yet another set of #ifdefs. For now, let's just skip it. */ //# ifdef PGMPOOL_WITH_CACHE // pgmPoolCacheUsed(pPool, pShwPage); //# endif } else { pgmPoolFreeByPage(pPool, pShwPage, SHW_POOL_ROOT_IDX, iPdShw); pPDEDst->u = 0; MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstFreed)); } } else MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstNotPresent)); pPDEDst++; } } # if PGM_GST_TYPE == PGM_TYPE_PAE else if (iPD + iPDPTE * X86_PG_PAE_ENTRIES != iPdNoMapping) # else else if (iPD != iPdNoMapping) # endif { /* * Check if there is any page directory to mark not present here. */ # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT for (unsigned i = 0, iPdShw = iPD * 2; i < 2; i++, iPdShw++) /* pray that the compiler unrolls this */ # elif PGM_GST_TYPE == PGM_TYPE_PAE || PGM_GST_TYPE == PGM_TYPE_AMD64 const unsigned iPdShw = iPD + iPDPTE * X86_PG_PAE_ENTRIES; NOREF(iPdShw); # else const unsigned iPdShw = iPD; NOREF(iPdShw); # endif { if (pPDEDst->n.u1Present) { pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, pPDEDst->u & SHW_PDE_PG_MASK), SHW_POOL_ROOT_IDX, iPdShw); pPDEDst->u = 0; MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstFreedSrcNP)); } pPDEDst++; } } else { # if (PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE) \ && !defined(PGM_WITHOUT_MAPPINGS) const unsigned cPTs = pMapping->cb >> SHW_PD_SHIFT; /* needed below to skip the mapping */ Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s)); if (pVM->pgm.s.fMappingsFixed) { /* It's fixed, just skip the mapping. */ pMapping = pMapping->CTXALLSUFF(pNext); iPdNoMapping = pMapping ? pMapping->GCPtr >> GST_PD_SHIFT : ~0U; } else { /* * Check for conflicts for subsequent pagetables * and advance to the next mapping. */ iPdNoMapping = ~0U; unsigned iPT = pMapping->cb >> GST_PD_SHIFT; while (iPT-- > 1) { if ( pPDSrc->a[iPD + iPT].n.u1Present && (pPDSrc->a[iPD + iPT].n.u1User || fRawR0Enabled)) { # ifdef IN_RING3 # if PGM_GST_TYPE == PGM_TYPE_32BIT int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, iPD << GST_PD_SHIFT); # elif PGM_GST_TYPE == PGM_TYPE_PAE int rc = pgmR3SyncPTResolveConflictPAE(pVM, pMapping, (iPDPTE << GST_PDPT_SHIFT) + (iPD << GST_PD_SHIFT)); # endif if (VBOX_FAILURE(rc)) return rc; /* * Update iPdNoMapping and pMapping. */ pMapping = pVM->pgm.s.CTXALLSUFF(pMappings); while (pMapping && pMapping->GCPtr < (iPD << GST_PD_SHIFT)) pMapping = pMapping->CTXALLSUFF(pNext); iPdNoMapping = pMapping ? pMapping->GCPtr >> GST_PD_SHIFT : ~0U; break; # else LogFlow(("SyncCR3: detected conflict -> VINF_PGM_SYNC_CR3\n")); return VINF_PGM_SYNC_CR3; # endif } } if (iPdNoMapping == ~0U && pMapping) { pMapping = pMapping->CTXALLSUFF(pNext); if (pMapping) iPdNoMapping = pMapping->GCPtr >> GST_PD_SHIFT; } } /* advance. */ iPD += cPTs - 1; pPDEDst += cPTs; # else /* PGM_GST_TYPE != PGM_TYPE_32BIT && PGM_GST_TYPE != PGM_TYPE_PAE && PGM_WITHOUT_MAPPINGS */ Assert(!pgmMapAreMappingsEnabled(&pVM->pgm.s)); # endif /* (PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE) && !PGM_WITHOUT_MAPPINGS */ } } /* for iPD */ } /* for each PDPTE (PAE) */ return VINF_SUCCESS; #elif PGM_GST_TYPE == PGM_TYPE_AMD64 //# error not implemented return VERR_INTERNAL_ERROR; #else /* guest real and protected mode */ return VINF_SUCCESS; #endif } #ifdef VBOX_STRICT #ifdef IN_GC # undef AssertMsgFailed # define AssertMsgFailed Log #endif #ifdef IN_RING3 # include /** * Dumps a page table hierarchy use only physical addresses and cr4/lm flags. * * @returns VBox status code (VINF_SUCCESS). * @param pVM The VM handle. * @param cr3 The root of the hierarchy. * @param crr The cr4, only PAE and PSE is currently used. * @param fLongMode Set if long mode, false if not long mode. * @param cMaxDepth Number of levels to dump. * @param pHlp Pointer to the output functions. */ __BEGIN_DECLS PGMR3DECL(int) PGMR3DumpHierarchyHC(PVM pVM, uint32_t cr3, uint32_t cr4, bool fLongMode, unsigned cMaxDepth, PCDBGFINFOHLP pHlp); __END_DECLS #endif /** * Checks that the shadow page table is in sync with the guest one. * * @returns The number of errors. * @param pVM The virtual machine. * @param cr3 Guest context CR3 register * @param cr4 Guest context CR4 register * @param GCPtr Where to start. Defaults to 0. * @param cb How much to check. Defaults to everything. */ PGM_BTH_DECL(unsigned, AssertCR3)(PVM pVM, uint64_t cr3, uint64_t cr4, RTGCUINTPTR GCPtr, RTGCUINTPTR cb) { unsigned cErrors = 0; #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE PPGM pPGM = &pVM->pgm.s; RTGCPHYS GCPhysGst; /* page address derived from the guest page tables. */ RTHCPHYS HCPhysShw; /* page address derived from the shadow page tables. */ # ifndef IN_RING0 RTHCPHYS HCPhys; /* general usage. */ # endif int rc; /* * Check that the Guest CR3 and all its mappings are correct. */ AssertMsgReturn(pPGM->GCPhysCR3 == (cr3 & GST_CR3_PAGE_MASK), ("Invalid GCPhysCR3=%VGp cr3=%VGp\n", pPGM->GCPhysCR3, (RTGCPHYS)cr3), false); # ifndef IN_RING0 # if PGM_GST_TYPE == PGM_TYPE_32BIT rc = PGMShwGetPage(pVM, pPGM->pGuestPDGC, NULL, &HCPhysShw); # else rc = PGMShwGetPage(pVM, pPGM->pGstPaePDPTGC, NULL, &HCPhysShw); # endif AssertRCReturn(rc, 1); HCPhys = NIL_RTHCPHYS; rc = pgmRamGCPhys2HCPhys(pPGM, cr3 & GST_CR3_PAGE_MASK, &HCPhys); AssertMsgReturn(HCPhys == HCPhysShw, ("HCPhys=%VHp HCPhyswShw=%VHp (cr3)\n", HCPhys, HCPhysShw), false); # if PGM_GST_TYPE == PGM_TYPE_32BIT && defined(IN_RING3) RTGCPHYS GCPhys; rc = PGMR3DbgHCPtr2GCPhys(pVM, pPGM->pGuestPDHC, &GCPhys); AssertRCReturn(rc, 1); AssertMsgReturn((cr3 & GST_CR3_PAGE_MASK) == GCPhys, ("GCPhys=%VGp cr3=%VGp\n", GCPhys, (RTGCPHYS)cr3), false); # endif #endif /* !IN_RING0 */ # if PGM_GST_TYPE == PGM_TYPE_32BIT const GSTPD *pPDSrc = CTXSUFF(pPGM->pGuestPD); # endif /* * Get and check the Shadow CR3. */ # if PGM_SHW_TYPE == PGM_TYPE_32BIT const X86PD *pPDDst = pPGM->CTXMID(p,32BitPD); unsigned cPDEs = ELEMENTS(pPDDst->a); # else const X86PDPAE *pPDDst = pPGM->CTXMID(ap,PaePDs[0]); /* use it as a 2048 entry PD */ unsigned cPDEs = ELEMENTS(pPDDst->a) * ELEMENTS(pPGM->apHCPaePDs); # endif if (cb != ~(RTGCUINTPTR)0) cPDEs = RT_MIN(cb >> SHW_PD_SHIFT, 1); /** @todo call the other two PGMAssert*() functions. */ # if PGM_GST_TYPE == PGM_TYPE_PAE /* * Check the 4 PDPTs too. */ for (unsigned i = 0; i < 4; i++) { RTHCPTR HCPtr; RTHCPHYS HCPhys; RTGCPHYS GCPhys = pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[i].u & X86_PDPE_PG_MASK; int rc2 = pgmRamGCPhys2HCPtrAndHCPhysWithFlags(&pVM->pgm.s, GCPhys, &HCPtr, &HCPhys); if (VBOX_SUCCESS(rc2)) { AssertMsg( pVM->pgm.s.apGstPaePDsHC[i] == (R3R0PTRTYPE(PX86PDPAE))HCPtr && pVM->pgm.s.aGCPhysGstPaePDs[i] == GCPhys, ("idx %d apGstPaePDsHC %VHv vs %VHv aGCPhysGstPaePDs %VGp vs %VGp\n", i, pVM->pgm.s.apGstPaePDsHC[i], HCPtr, pVM->pgm.s.aGCPhysGstPaePDs[i], GCPhys)); } } # endif /* * Iterate the shadow page directory. */ GCPtr = (GCPtr >> SHW_PD_SHIFT) << SHW_PD_SHIFT; unsigned iPDDst = GCPtr >> SHW_PD_SHIFT; cPDEs += iPDDst; for (; iPDDst < cPDEs; iPDDst++, GCPtr += _4G / cPDEs) { # if PGM_GST_TYPE == PGM_TYPE_PAE uint32_t iPDSrc; PGSTPD pPDSrc = pgmGstGetPaePDPtr(pPGM, (RTGCUINTPTR)GCPtr, &iPDSrc); if (!pPDSrc) { AssertMsg(!pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[(GCPtr >> GST_PDPT_SHIFT) & GST_PDPT_MASK].n.u1Present, ("Guest PDTPR not present, shadow PDPTR %VX64\n", pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[(GCPtr >> GST_PDPT_SHIFT) & GST_PDPT_MASK].u)); continue; } #endif const SHWPDE PdeDst = pPDDst->a[iPDDst]; if (PdeDst.u & PGM_PDFLAGS_MAPPING) { Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s)); if ((PdeDst.u & X86_PDE_AVL_MASK) != PGM_PDFLAGS_MAPPING) { AssertMsgFailed(("Mapping shall only have PGM_PDFLAGS_MAPPING set! PdeDst.u=%#RX64\n", (uint64_t)PdeDst.u)); cErrors++; continue; } } else if ( (PdeDst.u & X86_PDE_P) || ((PdeDst.u & (X86_PDE_P | PGM_PDFLAGS_TRACK_DIRTY)) == (X86_PDE_P | PGM_PDFLAGS_TRACK_DIRTY)) ) { HCPhysShw = PdeDst.u & SHW_PDE_PG_MASK; PPGMPOOLPAGE pPoolPage = pgmPoolGetPageByHCPhys(pVM, HCPhysShw); if (!pPoolPage) { AssertMsgFailed(("Invalid page table address %VGp at %VGv! PdeDst=%#RX64\n", HCPhysShw, GCPtr, (uint64_t)PdeDst.u)); cErrors++; continue; } const SHWPT *pPTDst = (const SHWPT *)PGMPOOL_PAGE_2_PTR(pVM, pPoolPage); if (PdeDst.u & (X86_PDE4M_PWT | X86_PDE4M_PCD)) { AssertMsgFailed(("PDE flags PWT and/or PCD is set at %VGv! These flags are not virtualized! PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeDst.u)); cErrors++; } if (PdeDst.u & (X86_PDE4M_G | X86_PDE4M_D)) { AssertMsgFailed(("4K PDE reserved flags at %VGv! PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeDst.u)); cErrors++; } const GSTPDE PdeSrc = pPDSrc->a[(iPDDst >> (GST_PD_SHIFT - SHW_PD_SHIFT)) & GST_PD_MASK]; if (!PdeSrc.n.u1Present) { AssertMsgFailed(("Guest PDE at %VGv is not present! PdeDst=%#RX64 PdeSrc=%#RX64\n", GCPtr, (uint64_t)PdeDst.u, (uint64_t)PdeSrc.u)); cErrors++; continue; } if ( !PdeSrc.b.u1Size || !(cr4 & X86_CR4_PSE)) { GCPhysGst = PdeSrc.u & GST_PDE_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT GCPhysGst |= (iPDDst & 1) * (PAGE_SIZE / 2); # endif } else { # if PGM_GST_TYPE == PGM_TYPE_32BIT if (PdeSrc.u & X86_PDE4M_PG_HIGH_MASK) { AssertMsgFailed(("Guest PDE at %VGv is using PSE36 or similar! PdeSrc=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u)); cErrors++; continue; } # endif GCPhysGst = PdeSrc.u & GST_PDE_BIG_PG_MASK; # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT GCPhysGst |= GCPtr & RT_BIT(X86_PAGE_2M_SHIFT); # endif } if ( pPoolPage->enmKind != (!PdeSrc.b.u1Size || !(cr4 & X86_CR4_PSE) ? BTH_PGMPOOLKIND_PT_FOR_PT : BTH_PGMPOOLKIND_PT_FOR_BIG)) { AssertMsgFailed(("Invalid shadow page table kind %d at %VGv! PdeSrc=%#RX64\n", pPoolPage->enmKind, GCPtr, (uint64_t)PdeSrc.u)); cErrors++; } PPGMPAGE pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst); if (!pPhysPage) { AssertMsgFailed(("Cannot find guest physical address %VGp in the PDE at %VGv! PdeSrc=%#RX64\n", GCPhysGst, GCPtr, (uint64_t)PdeSrc.u)); cErrors++; continue; } if (GCPhysGst != pPoolPage->GCPhys) { AssertMsgFailed(("GCPhysGst=%VGp != pPage->GCPhys=%VGp at %VGv\n", GCPhysGst, pPoolPage->GCPhys, GCPtr)); cErrors++; continue; } if ( !PdeSrc.b.u1Size || !(cr4 & X86_CR4_PSE)) { /* * Page Table. */ const GSTPT *pPTSrc; rc = PGM_GCPHYS_2_PTR(pVM, GCPhysGst & ~(RTGCPHYS)(PAGE_SIZE - 1), &pPTSrc); if (VBOX_FAILURE(rc)) { AssertMsgFailed(("Cannot map/convert guest physical address %VGp in the PDE at %VGv! PdeSrc=%#RX64\n", GCPhysGst, GCPtr, (uint64_t)PdeSrc.u)); cErrors++; continue; } if ( (PdeSrc.u & (X86_PDE_P | X86_PDE_US | X86_PDE_RW/* | X86_PDE_A*/)) != (PdeDst.u & (X86_PDE_P | X86_PDE_US | X86_PDE_RW/* | X86_PDE_A*/))) { /// @todo We get here a lot on out-of-sync CR3 entries. The access handler should zap them to avoid false alarms here! // (This problem will go away when/if we shadow multiple CR3s.) AssertMsgFailed(("4K PDE flags mismatch at %VGv! PdeSrc=%#RX64 PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; continue; } if (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY) { AssertMsgFailed(("4K PDEs cannot have PGM_PDFLAGS_TRACK_DIRTY set! GCPtr=%VGv PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeDst.u)); cErrors++; continue; } /* iterate the page table. */ # if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT /* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */ const unsigned offPTSrc = ((GCPtr >> SHW_PD_SHIFT) & 1) * 512; # else const unsigned offPTSrc = 0; # endif for (unsigned iPT = 0, off = 0; iPT < ELEMENTS(pPTDst->a); iPT++, off += PAGE_SIZE) { const SHWPTE PteDst = pPTDst->a[iPT]; /* skip not-present entries. */ if (!(PteDst.u & (X86_PTE_P | PGM_PTFLAGS_TRACK_DIRTY))) /** @todo deal with ALL handlers and CSAM !P pages! */ continue; Assert(PteDst.n.u1Present); const GSTPTE PteSrc = pPTSrc->a[iPT + offPTSrc]; if (!PteSrc.n.u1Present) { #ifdef IN_RING3 PGMAssertHandlerAndFlagsInSync(pVM); PGMR3DumpHierarchyGC(pVM, cr3, cr4, (PdeSrc.u & GST_PDE_PG_MASK)); #endif AssertMsgFailed(("Out of sync (!P) PTE at %VGv! PteSrc=%#RX64 PteDst=%#RX64 pPTSrc=%VGv iPTSrc=%x PdeSrc=%x physpte=%VGp\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u, pPTSrc, iPT + offPTSrc, PdeSrc.au32[0], (PdeSrc.u & GST_PDE_PG_MASK) + (iPT + offPTSrc)*sizeof(PteSrc))); cErrors++; continue; } uint64_t fIgnoreFlags = GST_PTE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_G | X86_PTE_D | X86_PTE_PWT | X86_PTE_PCD | X86_PTE_PAT; # if 1 /** @todo sync accessed bit properly... */ fIgnoreFlags |= X86_PTE_A; # endif /* match the physical addresses */ HCPhysShw = PteDst.u & SHW_PTE_PG_MASK; GCPhysGst = PteSrc.u & GST_PTE_PG_MASK; # ifdef IN_RING3 rc = PGMPhysGCPhys2HCPhys(pVM, GCPhysGst, &HCPhys); if (VBOX_FAILURE(rc)) { if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) { AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PteSrc=%#RX64 PteDst=%#RX64\n", GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } } else if (HCPhysShw != (HCPhys & SHW_PTE_PG_MASK)) { AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, HCPhysShw, HCPhys, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } # endif pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst); if (!pPhysPage) { # ifdef IN_RING3 /** @todo make MMR3PageDummyHCPhys an 'All' function! */ if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) { AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PteSrc=%#RX64 PteDst=%#RX64\n", GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } # endif if (PteDst.n.u1Write) { AssertMsgFailed(("Invalid guest page at %VGv is writable! GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_RW; } else if (HCPhysShw != (PGM_PAGE_GET_HCPHYS(pPhysPage) & SHW_PTE_PG_MASK)) { AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, HCPhysShw, pPhysPage->HCPhys, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } /* flags */ if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPhysPage)) { if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPhysPage)) { if (PteDst.n.u1Write) { AssertMsgFailed(("WRITE access flagged at %VGv but the page is writable! HCPhys=%VGv PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, pPhysPage->HCPhys, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } fIgnoreFlags |= X86_PTE_RW; } else { if (PteDst.n.u1Present) { AssertMsgFailed(("ALL access flagged at %VGv but the page is present! HCPhys=%VHp PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, pPhysPage->HCPhys, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } fIgnoreFlags |= X86_PTE_P; } } else { if (!PteSrc.n.u1Dirty && PteSrc.n.u1Write) { if (PteDst.n.u1Write) { AssertMsgFailed(("!DIRTY page at %VGv is writable! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } if (!(PteDst.u & PGM_PTFLAGS_TRACK_DIRTY)) { AssertMsgFailed(("!DIRTY page at %VGv is not marked TRACK_DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } if (PteDst.n.u1Dirty) { AssertMsgFailed(("!DIRTY page at %VGv is marked DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; } # if 0 /** @todo sync access bit properly... */ if (PteDst.n.u1Accessed != PteSrc.n.u1Accessed) { AssertMsgFailed(("!DIRTY page at %VGv is has mismatching accessed bit! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_RW; # else fIgnoreFlags |= X86_PTE_RW | X86_PTE_A; # endif } else if (PteDst.u & PGM_PTFLAGS_TRACK_DIRTY) { /* access bit emulation (not implemented). */ if (PteSrc.n.u1Accessed || PteDst.n.u1Present) { AssertMsgFailed(("PGM_PTFLAGS_TRACK_DIRTY set at %VGv but no accessed bit emulation! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } if (!PteDst.n.u1Accessed) { AssertMsgFailed(("!ACCESSED page at %VGv is has the accessed bit set! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_P; } # ifdef DEBUG_sandervl fIgnoreFlags |= X86_PTE_D | X86_PTE_A; # endif } if ( (PteSrc.u & ~fIgnoreFlags) != (PteDst.u & ~fIgnoreFlags) && (PteSrc.u & ~(fIgnoreFlags | X86_PTE_RW)) != (PteDst.u & ~fIgnoreFlags) ) { AssertMsgFailed(("Flags mismatch at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PteSrc.u & ~fIgnoreFlags, (uint64_t)PteDst.u & ~fIgnoreFlags, fIgnoreFlags, (uint64_t)PteSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } } /* foreach PTE */ } else { /* * Big Page. */ uint64_t fIgnoreFlags = X86_PDE_AVL_MASK | GST_PDE_PG_MASK | X86_PDE4M_G | X86_PDE4M_D | X86_PDE4M_PS | X86_PDE4M_PWT | X86_PDE4M_PCD; if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write) { if (PdeDst.n.u1Write) { AssertMsgFailed(("!DIRTY page at %VGv is writable! PdeSrc=%#RX64 PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; continue; } if (!(PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)) { AssertMsgFailed(("!DIRTY page at %VGv is not marked TRACK_DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; continue; } # if 0 /** @todo sync access bit properly... */ if (PdeDst.n.u1Accessed != PdeSrc.b.u1Accessed) { AssertMsgFailed(("!DIRTY page at %VGv is has mismatching accessed bit! PteSrc=%#RX64 PteDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_RW; # else fIgnoreFlags |= X86_PTE_RW | X86_PTE_A; # endif } else if (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY) { /* access bit emulation (not implemented). */ if (PdeSrc.b.u1Accessed || PdeDst.n.u1Present) { AssertMsgFailed(("PGM_PDFLAGS_TRACK_DIRTY set at %VGv but no accessed bit emulation! PdeSrc=%#RX64 PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; continue; } if (!PdeDst.n.u1Accessed) { AssertMsgFailed(("!ACCESSED page at %VGv is has the accessed bit set! PdeSrc=%#RX64 PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_P; } if ((PdeSrc.u & ~fIgnoreFlags) != (PdeDst.u & ~fIgnoreFlags)) { AssertMsgFailed(("Flags mismatch (B) at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PdeSrc=%#RX64 PdeDst=%#RX64\n", GCPtr, (uint64_t)PdeSrc.u & ~fIgnoreFlags, (uint64_t)PdeDst.u & ~fIgnoreFlags, fIgnoreFlags, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u)); cErrors++; } /* iterate the page table. */ for (unsigned iPT = 0, off = 0; iPT < ELEMENTS(pPTDst->a); iPT++, off += PAGE_SIZE, GCPhysGst += PAGE_SIZE) { const SHWPTE PteDst = pPTDst->a[iPT]; if (PteDst.u & PGM_PTFLAGS_TRACK_DIRTY) { AssertMsgFailed(("The PTE at %VGv emulating a 2/4M page is marked TRACK_DIRTY! PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; } /* skip not-present entries. */ if (!PteDst.n.u1Present) /** @todo deal with ALL handlers and CSAM !P pages! */ continue; fIgnoreFlags = X86_PTE_PAE_PG_MASK | X86_PTE_AVL_MASK | X86_PTE_PWT | X86_PTE_PCD | X86_PTE_PAT; /* match the physical addresses */ HCPhysShw = PteDst.u & X86_PTE_PAE_PG_MASK; # ifdef IN_RING3 rc = PGMPhysGCPhys2HCPhys(pVM, GCPhysGst, &HCPhys); if (VBOX_FAILURE(rc)) { if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) { AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PdeSrc=%#RX64 PteDst=%#RX64\n", GCPhysGst, GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; } } else if (HCPhysShw != (HCPhys & X86_PTE_PAE_PG_MASK)) { AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, HCPhysShw, HCPhys, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } # endif pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst); if (!pPhysPage) { # ifdef IN_RING3 /** @todo make MMR3PageDummyHCPhys an 'All' function! */ if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) { AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PdeSrc=%#RX64 PteDst=%#RX64\n", GCPhysGst, GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } # endif if (PteDst.n.u1Write) { AssertMsgFailed(("Invalid guest page at %VGv is writable! GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; } fIgnoreFlags |= X86_PTE_RW; } else if (HCPhysShw != (pPhysPage->HCPhys & X86_PTE_PAE_PG_MASK)) { AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, HCPhysShw, pPhysPage->HCPhys, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } /* flags */ if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPhysPage)) { if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPhysPage)) { if (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage) != PGM_PAGE_HNDL_PHYS_STATE_DISABLED) { if (PteDst.n.u1Write) { AssertMsgFailed(("WRITE access flagged at %VGv but the page is writable! HCPhys=%VGv PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, pPhysPage->HCPhys, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } fIgnoreFlags |= X86_PTE_RW; } } else { if (PteDst.n.u1Present) { AssertMsgFailed(("ALL access flagged at %VGv but the page is present! HCPhys=%VGv PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, pPhysPage->HCPhys, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } fIgnoreFlags |= X86_PTE_P; } } if ( (PdeSrc.u & ~fIgnoreFlags) != (PteDst.u & ~fIgnoreFlags) && (PdeSrc.u & ~(fIgnoreFlags | X86_PTE_RW)) != (PteDst.u & ~fIgnoreFlags) /* lazy phys handler dereg. */ ) { AssertMsgFailed(("Flags mismatch (BT) at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PdeSrc=%#RX64 PteDst=%#RX64\n", GCPtr + off, (uint64_t)PdeSrc.u & ~fIgnoreFlags, (uint64_t)PteDst.u & ~fIgnoreFlags, fIgnoreFlags, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u)); cErrors++; continue; } } /* foreach PTE */ } } /* not present */ } /* forearch PDE */ # ifdef DEBUG if (cErrors) LogFlow(("AssertCR3: cErrors=%d\n", cErrors)); # endif #elif PGM_GST_TYPE == PGM_TYPE_PAE //# error not implemented #elif PGM_GST_TYPE == PGM_TYPE_AMD64 //# error not implemented /*#else: guest real and protected mode */ #endif return cErrors; } #endif /* VBOX_STRICT */