/* $Id: PGMAllGst.h 10342 2008-07-07 17:22:16Z vboxsync $ */ /** @file * VBox - Page Manager, Guest Paging Template - All context code. */ /* * Copyright (C) 2006-2007 Sun Microsystems, Inc. * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ /******************************************************************************* * Defined Constants And Macros * *******************************************************************************/ #undef GSTPT #undef PGSTPT #undef GSTPTE #undef PGSTPTE #undef GSTPD #undef PGSTPD #undef GSTPDE #undef PGSTPDE #undef GST_BIG_PAGE_SIZE #undef GST_BIG_PAGE_OFFSET_MASK #undef GST_PDE_PG_MASK #undef GST_PDE_BIG_PG_MASK #undef GST_PD_SHIFT #undef GST_PD_MASK #undef GST_PTE_PG_MASK #undef GST_PT_SHIFT #undef GST_PT_MASK #undef GST_TOTAL_PD_ENTRIES #undef GST_CR3_PAGE_MASK #undef GST_PDPE_ENTRIES #undef GST_PDPT_SHIFT #undef GST_PDPT_MASK #undef GST_PDPE_PG_MASK #if PGM_GST_TYPE == PGM_TYPE_REAL \ || PGM_GST_TYPE == PGM_TYPE_PROT # define GSTPT SHWPT # define PGSTPT PSHWPT # define GSTPTE SHWPTE # define PGSTPTE PSHWPTE # define GSTPD SHWPD # define PGSTPD PSHWPD # define GSTPDE SHWPDE # define PGSTPDE PSHWPDE # define GST_PTE_PG_MASK SHW_PTE_PG_MASK #elif PGM_GST_TYPE == PGM_TYPE_32BIT # define GSTPT X86PT # define PGSTPT PX86PT # define GSTPTE X86PTE # define PGSTPTE PX86PTE # define GSTPD X86PD # define PGSTPD PX86PD # define GSTPDE X86PDE # define PGSTPDE PX86PDE # define GST_BIG_PAGE_SIZE X86_PAGE_4M_SIZE # define GST_BIG_PAGE_OFFSET_MASK X86_PAGE_4M_OFFSET_MASK # define GST_PDE_PG_MASK X86_PDE_PG_MASK # define GST_PDE_BIG_PG_MASK X86_PDE4M_PG_MASK # define GST_PD_SHIFT X86_PD_SHIFT # define GST_PD_MASK X86_PD_MASK # define GST_TOTAL_PD_ENTRIES X86_PG_ENTRIES # define GST_PTE_PG_MASK X86_PTE_PG_MASK # define GST_PT_SHIFT X86_PT_SHIFT # define GST_PT_MASK X86_PT_MASK # define GST_CR3_PAGE_MASK X86_CR3_PAGE_MASK #elif PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 # define GSTPT X86PTPAE # define PGSTPT PX86PTPAE # define GSTPTE X86PTEPAE # define PGSTPTE PX86PTEPAE # define GSTPD X86PDPAE # define PGSTPD PX86PDPAE # define GSTPDE X86PDEPAE # define PGSTPDE PX86PDEPAE # define GST_BIG_PAGE_SIZE X86_PAGE_2M_SIZE # define GST_BIG_PAGE_OFFSET_MASK X86_PAGE_2M_OFFSET_MASK # define GST_PDE_PG_MASK X86_PDE_PAE_PG_MASK_FULL # define GST_PDE_BIG_PG_MASK X86_PDE2M_PAE_PG_MASK # define GST_PD_SHIFT X86_PD_PAE_SHIFT # define GST_PD_MASK X86_PD_PAE_MASK # if PGM_GST_TYPE == PGM_TYPE_PAE # define GST_TOTAL_PD_ENTRIES (X86_PG_PAE_ENTRIES * X86_PG_PAE_PDPE_ENTRIES) # define GST_PDPE_ENTRIES X86_PG_PAE_PDPE_ENTRIES # define GST_PDPE_PG_MASK X86_PDPE_PG_MASK_FULL # define GST_PDPT_SHIFT X86_PDPT_SHIFT # define GST_PDPT_MASK X86_PDPT_MASK_PAE # define GST_PTE_PG_MASK X86_PTE_PAE_PG_MASK # define GST_CR3_PAGE_MASK X86_CR3_PAE_PAGE_MASK # else # define GST_TOTAL_PD_ENTRIES (X86_PG_AMD64_ENTRIES * X86_PG_AMD64_PDPE_ENTRIES) # define GST_PDPE_ENTRIES X86_PG_AMD64_PDPE_ENTRIES # define GST_PDPT_SHIFT X86_PDPT_SHIFT # define GST_PDPE_PG_MASK X86_PDPE_PG_MASK_FULL # define GST_PDPT_MASK X86_PDPT_MASK_AMD64 # define GST_PTE_PG_MASK X86_PTE_PAE_PG_MASK_FULL # define GST_CR3_PAGE_MASK X86_CR3_AMD64_PAGE_MASK # endif # define GST_PT_SHIFT X86_PT_PAE_SHIFT # define GST_PT_MASK X86_PT_PAE_MASK #endif /******************************************************************************* * Internal Functions * *******************************************************************************/ __BEGIN_DECLS PGM_GST_DECL(int, GetPage)(PVM pVM, RTGCUINTPTR GCPtr, uint64_t *pfFlags, PRTGCPHYS pGCPhys); PGM_GST_DECL(int, ModifyPage)(PVM pVM, RTGCUINTPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask); PGM_GST_DECL(int, GetPDE)(PVM pVM, RTGCUINTPTR GCPtr, PX86PDEPAE pPDE); PGM_GST_DECL(int, MapCR3)(PVM pVM, RTGCPHYS GCPhysCR3); PGM_GST_DECL(int, UnmapCR3)(PVM pVM); PGM_GST_DECL(int, MonitorCR3)(PVM pVM, RTGCPHYS GCPhysCR3); PGM_GST_DECL(int, UnmonitorCR3)(PVM pVM); PGM_GST_DECL(bool, HandlerVirtualUpdate)(PVM pVM, uint32_t cr4); #ifndef IN_RING3 PGM_GST_DECL(int, WriteHandlerCR3)(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser); # if PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 PGM_GST_DECL(int, PAEWriteHandlerPD)(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser); # endif #endif __END_DECLS /** * Gets effective Guest OS page information. * * When GCPtr is in a big page, the function will return as if it was a normal * 4KB page. If the need for distinguishing between big and normal page becomes * necessary at a later point, a PGMGstGetPage Ex() will be created for that * purpose. * * @returns VBox status. * @param pVM VM Handle. * @param GCPtr Guest Context virtual address of the page. Page aligned! * @param pfFlags Where to store the flags. These are X86_PTE_*, even for big pages. * @param pGCPhys Where to store the GC physical address of the page. * This is page aligned. The fact that the */ PGM_GST_DECL(int, GetPage)(PVM pVM, RTGCUINTPTR GCPtr, uint64_t *pfFlags, PRTGCPHYS pGCPhys) { #if PGM_GST_TYPE == PGM_TYPE_REAL \ || PGM_GST_TYPE == PGM_TYPE_PROT /* * Fake it. */ if (pfFlags) *pfFlags = X86_PTE_P | X86_PTE_RW | X86_PTE_US; if (pGCPhys) *pGCPhys = GCPtr & PAGE_BASE_GC_MASK; return VINF_SUCCESS; #elif PGM_GST_TYPE == PGM_TYPE_32BIT || PGM_GST_TYPE == PGM_TYPE_PAE || PGM_GST_TYPE == PGM_TYPE_AMD64 /* * Get the PDE. */ # if PGM_GST_TYPE == PGM_TYPE_32BIT const X86PDE Pde = CTXSUFF(pVM->pgm.s.pGuestPD)->a[GCPtr >> X86_PD_SHIFT]; #elif PGM_GST_TYPE == PGM_TYPE_PAE X86PDEPAE Pde; bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE); /* pgmGstGetPaePDE will return 0 if the PDPTE is marked as not present * All the other bits in the PDPTE are only valid in long mode (r/w, u/s, nx) */ Pde.u = pgmGstGetPaePDE(&pVM->pgm.s, GCPtr); #elif PGM_GST_TYPE == PGM_TYPE_AMD64 PX86PML4E pPml4e; X86PDPE Pdpe; X86PDEPAE Pde; bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE); Pde.u = pgmGstGetLongModePDE(&pVM->pgm.s, GCPtr, &pPml4e, &Pdpe); Assert(pPml4e); if (!(pPml4e->n.u1Present & Pdpe.n.u1Present)) return VERR_PAGE_TABLE_NOT_PRESENT; /* Merge accessed, write, user and no-execute bits into the PDE. */ Pde.n.u1Accessed &= pPml4e->n.u1Accessed & Pdpe.lm.u1Accessed; Pde.n.u1Write &= pPml4e->n.u1Write & Pdpe.lm.u1Write; Pde.n.u1User &= pPml4e->n.u1User & Pdpe.lm.u1User; Pde.n.u1NoExecute &= pPml4e->n.u1NoExecute & Pdpe.lm.u1NoExecute; # endif /* * Lookup the page. */ if (!Pde.n.u1Present) return VERR_PAGE_TABLE_NOT_PRESENT; if ( !Pde.b.u1Size # if PGM_GST_TYPE != PGM_TYPE_AMD64 || !(CPUMGetGuestCR4(pVM) & X86_CR4_PSE) # endif ) { PGSTPT pPT; int rc = PGM_GCPHYS_2_PTR(pVM, Pde.u & GST_PDE_PG_MASK, &pPT); if (VBOX_FAILURE(rc)) return rc; /* * Get PT entry and check presence. */ const GSTPTE Pte = pPT->a[(GCPtr >> GST_PT_SHIFT) & GST_PT_MASK]; if (!Pte.n.u1Present) return VERR_PAGE_NOT_PRESENT; /* * Store the result. * RW and US flags depend on all levels (bitwise AND) - except for legacy PAE * where the PDPE is simplified. */ if (pfFlags) { *pfFlags = (Pte.u & ~GST_PTE_PG_MASK) & ((Pde.u & (X86_PTE_RW | X86_PTE_US)) | ~(uint64_t)(X86_PTE_RW | X86_PTE_US)); # if PGM_WITH_NX(PGM_GST_TYPE) /* The NX bit is determined by a bitwise OR between the PT and PD */ if (fNoExecuteBitValid) *pfFlags |= (Pte.u & Pde.u & X86_PTE_PAE_NX); # endif } if (pGCPhys) *pGCPhys = Pte.u & GST_PTE_PG_MASK; } else { /* * Map big to 4k PTE and store the result */ if (pfFlags) { *pfFlags = (Pde.u & ~(GST_PTE_PG_MASK | X86_PTE_PAT)) | ((Pde.u & X86_PDE4M_PAT) >> X86_PDE4M_PAT_SHIFT); # if PGM_WITH_NX(PGM_GST_TYPE) /* The NX bit is determined by a bitwise OR between the PT and PD */ if (fNoExecuteBitValid) *pfFlags |= (Pde.u & X86_PTE_PAE_NX); # endif } if (pGCPhys) *pGCPhys = (Pde.u & GST_PDE_BIG_PG_MASK) | (GCPtr & (~GST_PDE_BIG_PG_MASK ^ ~GST_PTE_PG_MASK)); /** @todo pse36 */ } return VINF_SUCCESS; #else # error "shouldn't be here!" /* something else... */ return VERR_NOT_SUPPORTED; #endif } /** * Modify page flags for a range of pages in the guest's tables * * The existing flags are ANDed with the fMask and ORed with the fFlags. * * @returns VBox status code. * @param pVM VM handle. * @param GCPtr Virtual address of the first page in the range. Page aligned! * @param cb Size (in bytes) of the page range to apply the modification to. Page aligned! * @param fFlags The OR mask - page flags X86_PTE_*, excluding the page mask of course. * @param fMask The AND mask - page flags X86_PTE_*. */ PGM_GST_DECL(int, ModifyPage)(PVM pVM, RTGCUINTPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask) { #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 for (;;) { /* * Get the PD entry. */ # if PGM_GST_TYPE == PGM_TYPE_32BIT PX86PDE pPde = &CTXSUFF(pVM->pgm.s.pGuestPD)->a[GCPtr >> X86_PD_SHIFT]; # elif PGM_GST_TYPE == PGM_TYPE_PAE /* pgmGstGetPaePDEPtr will return 0 if the PDPTE is marked as not present * All the other bits in the PDPTE are only valid in long mode (r/w, u/s, nx) */ PX86PDEPAE pPde = pgmGstGetPaePDEPtr(&pVM->pgm.s, GCPtr); Assert(pPde); if (!pPde) return VERR_PAGE_TABLE_NOT_PRESENT; # elif PGM_GST_TYPE == PGM_TYPE_AMD64 /** @todo Setting the r/w, u/s & nx bits might have no effect depending on the pdpte & pml4 values */ PX86PDEPAE pPde = pgmGstGetLongModePDEPtr(&pVM->pgm.s, GCPtr); Assert(pPde); if (!pPde) return VERR_PAGE_TABLE_NOT_PRESENT; # endif GSTPDE Pde = *pPde; Assert(Pde.n.u1Present); if (!Pde.n.u1Present) return VERR_PAGE_TABLE_NOT_PRESENT; if ( !Pde.b.u1Size # if PGM_GST_TYPE != PGM_TYPE_AMD64 || !(CPUMGetGuestCR4(pVM) & X86_CR4_PSE) # endif ) { /* * 4KB Page table * * Walk page tables and pages till we're done. */ PGSTPT pPT; int rc = PGM_GCPHYS_2_PTR(pVM, Pde.u & GST_PDE_PG_MASK, &pPT); if (VBOX_FAILURE(rc)) return rc; unsigned iPTE = (GCPtr >> GST_PT_SHIFT) & GST_PT_MASK; while (iPTE < RT_ELEMENTS(pPT->a)) { GSTPTE Pte = pPT->a[iPTE]; Pte.u = (Pte.u & (fMask | X86_PTE_PAE_PG_MASK)) | (fFlags & ~GST_PTE_PG_MASK); pPT->a[iPTE] = Pte; /* next page */ cb -= PAGE_SIZE; if (!cb) return VINF_SUCCESS; GCPtr += PAGE_SIZE; iPTE++; } } else { /* * 4MB Page table */ Pde.u = (Pde.u & (fMask | ((fMask & X86_PTE_PAT) << X86_PDE4M_PAT_SHIFT) | GST_PDE_BIG_PG_MASK | X86_PDE4M_PS)) /** @todo pse36 */ | (fFlags & ~GST_PTE_PG_MASK) | ((fFlags & X86_PTE_PAT) << X86_PDE4M_PAT_SHIFT); *pPde = Pde; /* advance */ const unsigned cbDone = GST_BIG_PAGE_SIZE - (GCPtr & GST_BIG_PAGE_OFFSET_MASK); if (cbDone >= cb) return VINF_SUCCESS; cb -= cbDone; GCPtr += cbDone; } } #else /* real / protected mode: ignore. */ return VINF_SUCCESS; #endif } /** * Retrieve guest PDE information * * @returns VBox status code. * @param pVM The virtual machine. * @param GCPtr Guest context pointer * @param pPDE Pointer to guest PDE structure */ PGM_GST_DECL(int, GetPDE)(PVM pVM, RTGCUINTPTR GCPtr, PX86PDEPAE pPDE) { #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 # if PGM_GST_TYPE == PGM_TYPE_32BIT X86PDE Pde; Pde = CTXSUFF(pVM->pgm.s.pGuestPD)->a[GCPtr >> GST_PD_SHIFT]; # elif PGM_GST_TYPE == PGM_TYPE_PAE X86PDEPAE Pde; Pde.u = pgmGstGetPaePDE(&pVM->pgm.s, GCPtr); # elif PGM_GST_TYPE == PGM_TYPE_AMD64 X86PDEPAE Pde; Pde.u = pgmGstGetLongModePDE(&pVM->pgm.s, GCPtr); # endif pPDE->u = (X86PGPAEUINT)Pde.u; return VINF_SUCCESS; #else AssertFailed(); return VERR_NOT_IMPLEMENTED; #endif } /** * Maps the CR3 into HMA in GC and locate it in HC. * * Note that a MapCR3 call is usually not followed by an UnmapCR3 call; whenever * CR3 is updated we simply call MapCR3 again. * * @returns VBox status, no specials. * @param pVM VM handle. * @param GCPhysCR3 The physical address in the CR3 register. */ PGM_GST_DECL(int, MapCR3)(PVM pVM, RTGCPHYS GCPhysCR3) { #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 LogFlow(("MapCR3: %VGp\n", GCPhysCR3)); /* * Map the page CR3 points at. */ RTHCPHYS HCPhysGuestCR3; RTHCPTR HCPtrGuestCR3; int rc = pgmRamGCPhys2HCPtrAndHCPhysWithFlags(&pVM->pgm.s, GCPhysCR3 & GST_CR3_PAGE_MASK, &HCPtrGuestCR3, &HCPhysGuestCR3); if (VBOX_SUCCESS(rc)) { rc = PGMMap(pVM, (RTGCUINTPTR)pVM->pgm.s.GCPtrCR3Mapping, HCPhysGuestCR3, PAGE_SIZE, 0); if (VBOX_SUCCESS(rc)) { PGM_INVL_PG(pVM->pgm.s.GCPtrCR3Mapping); # if PGM_GST_TYPE == PGM_TYPE_32BIT pVM->pgm.s.pGuestPDHC = (R3R0PTRTYPE(PX86PD))HCPtrGuestCR3; pVM->pgm.s.pGuestPDGC = (RCPTRTYPE(PX86PD))pVM->pgm.s.GCPtrCR3Mapping; # elif PGM_GST_TYPE == PGM_TYPE_PAE unsigned offset = GCPhysCR3 & GST_CR3_PAGE_MASK & PAGE_OFFSET_MASK; pVM->pgm.s.pGstPaePDPTHC = (R3R0PTRTYPE(PX86PDPT)) HCPtrGuestCR3; pVM->pgm.s.pGstPaePDPTGC = (RCPTRTYPE(PX86PDPT)) ((RCPTRTYPE(uint8_t *))pVM->pgm.s.GCPtrCR3Mapping + offset); Log(("Cached mapping %VGv\n", pVM->pgm.s.pGstPaePDPTGC)); /* * Map the 4 PDs too. */ RTGCUINTPTR GCPtr = (RTGCUINTPTR)pVM->pgm.s.GCPtrCR3Mapping + PAGE_SIZE; for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++, GCPtr += PAGE_SIZE) { if (pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[i].n.u1Present) { 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)) { rc = PGMMap(pVM, GCPtr, HCPhys & X86_PTE_PAE_PG_MASK, PAGE_SIZE, 0); AssertRCReturn(rc, rc); pVM->pgm.s.apGstPaePDsHC[i] = (R3R0PTRTYPE(PX86PDPAE))HCPtr; pVM->pgm.s.apGstPaePDsGC[i] = (RCPTRTYPE(PX86PDPAE))GCPtr; pVM->pgm.s.aGCPhysGstPaePDs[i] = GCPhys; PGM_INVL_PG(GCPtr); continue; } AssertMsgFailed(("pgmR3Gst32BitMapCR3: rc2=%d GCPhys=%RGp i=%d\n", rc2, GCPhys, i)); } pVM->pgm.s.apGstPaePDsHC[i] = 0; pVM->pgm.s.apGstPaePDsGC[i] = 0; pVM->pgm.s.aGCPhysGstPaePDs[i] = NIL_RTGCPHYS; PGM_INVL_PG(GCPtr); } # elif PGM_GST_TYPE == PGM_TYPE_AMD64 PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool); pVM->pgm.s.pGstPaePML4HC = (R3R0PTRTYPE(PX86PML4))HCPtrGuestCR3; if (!HWACCMIsNestedPagingActive(pVM)) { if (pVM->pgm.s.pHCShwAmd64CR3) { pgmPoolFreeByPage(pPool, pVM->pgm.s.pHCShwAmd64CR3, PGMPOOL_IDX_AMD64_CR3, pVM->pgm.s.pHCShwAmd64CR3->GCPhys >> PAGE_SHIFT); pVM->pgm.s.pHCShwAmd64CR3 = 0; pVM->pgm.s.pHCPaePML4 = 0; pVM->pgm.s.HCPhysPaePML4 = 0; } Assert(!(GCPhysCR3 >> (PAGE_SHIFT + 32))); try_again: rc = pgmPoolAlloc(pVM, GCPhysCR3, PGMPOOLKIND_64BIT_PML4_FOR_64BIT_PML4, PGMPOOL_IDX_AMD64_CR3, GCPhysCR3 >> PAGE_SHIFT, &pVM->pgm.s.pHCShwAmd64CR3); if (rc == VERR_PGM_POOL_FLUSHED) { Assert(pVM->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL); rc = pgmPoolSyncCR3(pVM); AssertRC(rc); goto try_again; } pVM->pgm.s.pHCPaePML4 = (PX86PML4)PGMPOOL_PAGE_2_PTR(pPool->CTXSUFF(pVM), pVM->pgm.s.pHCShwAmd64CR3); pVM->pgm.s.HCPhysPaePML4 = pVM->pgm.s.pHCShwAmd64CR3->Core.Key; } # endif } else AssertMsgFailed(("rc=%Vrc GCPhysGuestPD=%VGp\n", rc, GCPhysCR3)); } else AssertMsgFailed(("rc=%Vrc GCPhysGuestPD=%VGp\n", rc, GCPhysCR3)); #else /* prot/real stub */ int rc = VINF_SUCCESS; #endif return rc; } /** * Unmaps the CR3. * * @returns VBox status, no specials. * @param pVM VM handle. */ PGM_GST_DECL(int, UnmapCR3)(PVM pVM) { LogFlow(("UnmapCR3\n")); int rc = VINF_SUCCESS; #if PGM_GST_TYPE == PGM_TYPE_32BIT pVM->pgm.s.pGuestPDHC = 0; pVM->pgm.s.pGuestPDGC = 0; #elif PGM_GST_TYPE == PGM_TYPE_PAE pVM->pgm.s.pGstPaePDPTHC = 0; pVM->pgm.s.pGstPaePDPTGC = 0; for (unsigned i=0; i < X86_PG_PAE_PDPE_ENTRIES; i++) { pVM->pgm.s.apGstPaePDsHC[i] = 0; pVM->pgm.s.apGstPaePDsGC[i] = 0; pVM->pgm.s.aGCPhysGstPaePDs[i] = NIL_RTGCPHYS; } #elif PGM_GST_TYPE == PGM_TYPE_AMD64 pVM->pgm.s.pGstPaePML4HC = 0; if (!HWACCMIsNestedPagingActive(pVM)) { pVM->pgm.s.pHCPaePML4 = 0; if (pVM->pgm.s.pHCShwAmd64CR3) { PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool); pgmPoolFreeByPage(pPool, pVM->pgm.s.pHCShwAmd64CR3, PGMPOOL_IDX_AMD64_CR3, pVM->pgm.s.pHCShwAmd64CR3->GCPhys >> PAGE_SHIFT); pVM->pgm.s.pHCShwAmd64CR3 = NULL; } } #else /* prot/real mode stub */ /* nothing to do */ #endif return rc; } #undef LOG_GROUP #define LOG_GROUP LOG_GROUP_PGM_POOL /** * Registers physical page monitors for the necessary paging * structures to detect conflicts with our guest mappings. * * This is always called after mapping CR3. * This is never called with fixed mappings. * * @returns VBox status, no specials. * @param pVM VM handle. * @param GCPhysCR3 The physical address in the CR3 register. */ PGM_GST_DECL(int, MonitorCR3)(PVM pVM, RTGCPHYS GCPhysCR3) { Assert(!pVM->pgm.s.fMappingsFixed); int rc = VINF_SUCCESS; /* * Register/Modify write phys handler for guest's CR3 if it changed. */ #if PGM_GST_TYPE == PGM_TYPE_32BIT if (pVM->pgm.s.GCPhysGstCR3Monitored != GCPhysCR3) { # ifndef PGMPOOL_WITH_MIXED_PT_CR3 const unsigned cbCR3Stuff = PGM_GST_TYPE == PGM_TYPE_PAE ? 32 : PAGE_SIZE; if (pVM->pgm.s.GCPhysGstCR3Monitored != NIL_RTGCPHYS) rc = PGMHandlerPhysicalModify(pVM, pVM->pgm.s.GCPhysGstCR3Monitored, GCPhysCR3, GCPhysCR3 + cbCR3Stuff - 1); else rc = PGMHandlerPhysicalRegisterEx(pVM, PGMPHYSHANDLERTYPE_PHYSICAL_WRITE, GCPhysCR3, GCPhysCR3 + cbCR3Stuff - 1, pVM->pgm.s.pfnR3GstWriteHandlerCR3, 0, pVM->pgm.s.pfnR0GstWriteHandlerCR3, 0, pVM->pgm.s.pfnGCGstWriteHandlerCR3, 0, pVM->pgm.s.pszR3GstWriteHandlerCR3); # else /* PGMPOOL_WITH_MIXED_PT_CR3 */ rc = pgmPoolMonitorMonitorCR3(pVM->pgm.s.CTXSUFF(pPool), pVM->pgm.s.enmShadowMode == PGMMODE_PAE || pVM->pgm.s.enmShadowMode == PGMMODE_PAE_NX ? PGMPOOL_IDX_PAE_PD : PGMPOOL_IDX_PD, GCPhysCR3); # endif /* PGMPOOL_WITH_MIXED_PT_CR3 */ if (VBOX_FAILURE(rc)) { AssertMsgFailed(("PGMHandlerPhysicalModify/PGMR3HandlerPhysicalRegister failed, rc=%Rrc GCPhysGstCR3Monitored=%RGp GCPhysCR3=%RGp\n", rc, pVM->pgm.s.GCPhysGstCR3Monitored, GCPhysCR3)); return rc; } pVM->pgm.s.GCPhysGstCR3Monitored = GCPhysCR3; } #elif PGM_GST_TYPE == PGM_TYPE_PAE /* Monitor the PDPT page */ /* * Register/Modify write phys handler for guest's CR3 if it changed. */ # ifndef PGMPOOL_WITH_MIXED_PT_CR3 AssertFailed(); # endif if (pVM->pgm.s.GCPhysGstCR3Monitored != GCPhysCR3) { rc = pgmPoolMonitorMonitorCR3(pVM->pgm.s.CTXSUFF(pPool), PGMPOOL_IDX_PDPT, GCPhysCR3); if (VBOX_FAILURE(rc)) { AssertMsgFailed(("PGMHandlerPhysicalModify/PGMR3HandlerPhysicalRegister failed, rc=%Rrc GCPhysGstCR3Monitored=%RGp GCPhysCR3=%RGp\n", rc, pVM->pgm.s.GCPhysGstCR3Monitored, GCPhysCR3)); return rc; } pVM->pgm.s.GCPhysGstCR3Monitored = GCPhysCR3; } /* * Do the 4 PDs. */ for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++) { if (CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].n.u1Present) { RTGCPHYS GCPhys = CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].u & X86_PDPE_PG_MASK; if (pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] != GCPhys) { Assert(pVM->pgm.s.enmShadowMode == PGMMODE_PAE || pVM->pgm.s.enmShadowMode == PGMMODE_PAE_NX); rc = pgmPoolMonitorMonitorCR3(pVM->pgm.s.CTXSUFF(pPool), PGMPOOL_IDX_PAE_PD_0 + i, GCPhys); } if (VBOX_FAILURE(rc)) { AssertMsgFailed(("PGMHandlerPhysicalModify/PGMR3HandlerPhysicalRegister failed, rc=%Rrc GCPhysGstCR3Monitored=%RGp GCPhysCR3=%RGp\n", rc, pVM->pgm.s.aGCPhysGstPaePDsMonitored[i], GCPhys)); return rc; } pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] = GCPhys; } else if (pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] != NIL_RTGCPHYS) { rc = pgmPoolMonitorUnmonitorCR3(pVM->pgm.s.CTXSUFF(pPool), PGMPOOL_IDX_PAE_PD_0 + i); AssertRC(rc); pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] = NIL_RTGCPHYS; } } #else /* prot/real/amd64 mode stub */ #endif return rc; } /** * Deregisters any physical page monitors installed by MonitorCR3. * * @returns VBox status code, no specials. * @param pVM The VM handle. */ PGM_GST_DECL(int, UnmonitorCR3)(PVM pVM) { int rc = VINF_SUCCESS; /* * Deregister the access handlers. * * PGMSyncCR3 will reinstall it if required and PGMSyncCR3 will be executed * before we enter GC again. */ #if PGM_GST_TYPE == PGM_TYPE_32BIT if (pVM->pgm.s.GCPhysGstCR3Monitored != NIL_RTGCPHYS) { # ifndef PGMPOOL_WITH_MIXED_PT_CR3 rc = PGMHandlerPhysicalDeregister(pVM, pVM->pgm.s.GCPhysGstCR3Monitored); AssertRCReturn(rc, rc); # else /* PGMPOOL_WITH_MIXED_PT_CR3 */ rc = pgmPoolMonitorUnmonitorCR3(pVM->pgm.s.CTXSUFF(pPool), pVM->pgm.s.enmShadowMode == PGMMODE_PAE || pVM->pgm.s.enmShadowMode == PGMMODE_PAE_NX ? PGMPOOL_IDX_PAE_PD : PGMPOOL_IDX_PD); AssertRCReturn(rc, rc); # endif /* PGMPOOL_WITH_MIXED_PT_CR3 */ pVM->pgm.s.GCPhysGstCR3Monitored = NIL_RTGCPHYS; } #elif PGM_GST_TYPE == PGM_TYPE_PAE /* The PDPT page */ # ifndef PGMPOOL_WITH_MIXED_PT_CR3 AssertFailed(); # endif if (pVM->pgm.s.GCPhysGstCR3Monitored != NIL_RTGCPHYS) { rc = pgmPoolMonitorUnmonitorCR3(pVM->pgm.s.CTXSUFF(pPool), PGMPOOL_IDX_PDPT); AssertRC(rc); } /* The 4 PDs. */ for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++) { if (pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] != NIL_RTGCPHYS) { Assert(pVM->pgm.s.enmShadowMode == PGMMODE_PAE || pVM->pgm.s.enmShadowMode == PGMMODE_PAE_NX); int rc2 = pgmPoolMonitorUnmonitorCR3(pVM->pgm.s.CTXSUFF(pPool), PGMPOOL_IDX_PAE_PD_0 + i); AssertRC(rc2); if (VBOX_FAILURE(rc2)) rc = rc2; pVM->pgm.s.aGCPhysGstPaePDsMonitored[i] = NIL_RTGCPHYS; } } #else /* prot/real/amd64 mode stub */ #endif return rc; } #undef LOG_GROUP #define LOG_GROUP LOG_GROUP_PGM #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 /** * Updates one virtual handler range. * * @returns 0 * @param pNode Pointer to a PGMVIRTHANDLER. * @param pvUser Pointer to a PGMVHUARGS structure (see PGM.cpp). */ static DECLCALLBACK(int) PGM_GST_NAME(VirtHandlerUpdateOne)(PAVLROGCPTRNODECORE pNode, void *pvUser) { PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)pNode; PPGMHVUSTATE pState = (PPGMHVUSTATE)pvUser; Assert(pCur->enmType != PGMVIRTHANDLERTYPE_HYPERVISOR); #if PGM_GST_TYPE == PGM_TYPE_32BIT PX86PD pPDSrc = pState->pVM->pgm.s.CTXSUFF(pGuestPD); #endif RTGCUINTPTR GCPtr = (RTUINTPTR)pCur->GCPtr; #if PGM_GST_MODE != PGM_MODE_AMD64 /* skip all stuff above 4GB if not AMD64 mode. */ if (GCPtr >= _4GB) return 0; #endif unsigned offPage = GCPtr & PAGE_OFFSET_MASK; unsigned iPage = 0; while (iPage < pCur->cPages) { #if PGM_GST_TYPE == PGM_TYPE_32BIT X86PDE Pde = pPDSrc->a[GCPtr >> X86_PD_SHIFT]; #elif PGM_GST_TYPE == PGM_TYPE_PAE X86PDEPAE Pde; Pde.u = pgmGstGetPaePDE(&pState->pVM->pgm.s, GCPtr); #elif PGM_GST_TYPE == PGM_TYPE_AMD64 X86PDEPAE Pde; Pde.u = pgmGstGetLongModePDE(&pState->pVM->pgm.s, GCPtr); #endif if (Pde.n.u1Present) { if ( !Pde.b.u1Size # if PGM_GST_TYPE != PGM_TYPE_AMD64 || !(pState->cr4 & X86_CR4_PSE) # endif ) { /* * Normal page table. */ PGSTPT pPT; int rc = PGM_GCPHYS_2_PTR(pState->pVM, Pde.u & GST_PDE_PG_MASK, &pPT); if (VBOX_SUCCESS(rc)) { for (unsigned iPTE = (GCPtr >> GST_PT_SHIFT) & GST_PT_MASK; iPTE < RT_ELEMENTS(pPT->a) && iPage < pCur->cPages; iPTE++, iPage++, GCPtr += PAGE_SIZE, offPage = 0) { GSTPTE Pte = pPT->a[iPTE]; RTGCPHYS GCPhysNew; if (Pte.n.u1Present) GCPhysNew = (RTGCPHYS)(pPT->a[iPTE].u & GST_PTE_PG_MASK) + offPage; else GCPhysNew = NIL_RTGCPHYS; if (pCur->aPhysToVirt[iPage].Core.Key != GCPhysNew) { if (pCur->aPhysToVirt[iPage].Core.Key != NIL_RTGCPHYS) pgmHandlerVirtualClearPage(&pState->pVM->pgm.s, pCur, iPage); #ifdef VBOX_STRICT_PGM_HANDLER_VIRTUAL AssertReleaseMsg(!pCur->aPhysToVirt[iPage].offNextAlias, ("{.Core.Key=%VGp, .Core.KeyLast=%VGp, .offVirtHandler=%#RX32, .offNextAlias=%#RX32} GCPhysNew=%VGp\n", pCur->aPhysToVirt[iPage].Core.Key, pCur->aPhysToVirt[iPage].Core.KeyLast, pCur->aPhysToVirt[iPage].offVirtHandler, pCur->aPhysToVirt[iPage].offNextAlias, GCPhysNew)); #endif pCur->aPhysToVirt[iPage].Core.Key = GCPhysNew; pState->fTodo |= PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL; } } } else { /* not-present. */ offPage = 0; AssertRC(rc); for (unsigned iPTE = (GCPtr >> GST_PT_SHIFT) & GST_PT_MASK; iPTE < RT_ELEMENTS(pPT->a) && iPage < pCur->cPages; iPTE++, iPage++, GCPtr += PAGE_SIZE) { if (pCur->aPhysToVirt[iPage].Core.Key != NIL_RTGCPHYS) { pgmHandlerVirtualClearPage(&pState->pVM->pgm.s, pCur, iPage); #ifdef VBOX_STRICT_PGM_HANDLER_VIRTUAL AssertReleaseMsg(!pCur->aPhysToVirt[iPage].offNextAlias, ("{.Core.Key=%VGp, .Core.KeyLast=%VGp, .offVirtHandler=%#RX32, .offNextAlias=%#RX32}\n", pCur->aPhysToVirt[iPage].Core.Key, pCur->aPhysToVirt[iPage].Core.KeyLast, pCur->aPhysToVirt[iPage].offVirtHandler, pCur->aPhysToVirt[iPage].offNextAlias)); #endif pCur->aPhysToVirt[iPage].Core.Key = NIL_RTGCPHYS; pState->fTodo |= PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL; } } } } else { /* * 2/4MB page. */ RTGCPHYS GCPhys = (RTGCPHYS)(Pde.u & GST_PDE_PG_MASK); for (unsigned i4KB = (GCPtr >> GST_PT_SHIFT) & GST_PT_MASK; i4KB < PAGE_SIZE / sizeof(GSTPDE) && iPage < pCur->cPages; i4KB++, iPage++, GCPtr += PAGE_SIZE, offPage = 0) { RTGCPHYS GCPhysNew = GCPhys + (i4KB << PAGE_SHIFT) + offPage; if (pCur->aPhysToVirt[iPage].Core.Key != GCPhysNew) { if (pCur->aPhysToVirt[iPage].Core.Key != NIL_RTGCPHYS) pgmHandlerVirtualClearPage(&pState->pVM->pgm.s, pCur, iPage); #ifdef VBOX_STRICT_PGM_HANDLER_VIRTUAL AssertReleaseMsg(!pCur->aPhysToVirt[iPage].offNextAlias, ("{.Core.Key=%VGp, .Core.KeyLast=%VGp, .offVirtHandler=%#RX32, .offNextAlias=%#RX32} GCPhysNew=%VGp\n", pCur->aPhysToVirt[iPage].Core.Key, pCur->aPhysToVirt[iPage].Core.KeyLast, pCur->aPhysToVirt[iPage].offVirtHandler, pCur->aPhysToVirt[iPage].offNextAlias, GCPhysNew)); #endif pCur->aPhysToVirt[iPage].Core.Key = GCPhysNew; pState->fTodo |= PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL; } } } /* pde type */ } else { /* not-present. */ for (unsigned cPages = (GST_PT_MASK + 1) - ((GCPtr >> GST_PT_SHIFT) & GST_PT_MASK); cPages && iPage < pCur->cPages; iPage++, GCPtr += PAGE_SIZE) { if (pCur->aPhysToVirt[iPage].Core.Key != NIL_RTGCPHYS) { pgmHandlerVirtualClearPage(&pState->pVM->pgm.s, pCur, iPage); pCur->aPhysToVirt[iPage].Core.Key = NIL_RTGCPHYS; pState->fTodo |= PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL; } } offPage = 0; } } /* for pages in virtual mapping. */ return 0; } #endif /* 32BIT, PAE and AMD64 */ /** * Updates the virtual page access handlers. * * @returns true if bits were flushed. * @returns false if bits weren't flushed. * @param pVM VM handle. * @param pPDSrc The page directory. * @param cr4 The cr4 register value. */ PGM_GST_DECL(bool, HandlerVirtualUpdate)(PVM pVM, uint32_t cr4) { #if PGM_GST_TYPE == PGM_TYPE_32BIT \ || PGM_GST_TYPE == PGM_TYPE_PAE \ || PGM_GST_TYPE == PGM_TYPE_AMD64 /** @todo * In theory this is not sufficient: the guest can change a single page in a range with invlpg */ /* * Resolve any virtual address based access handlers to GC physical addresses. * This should be fairly quick. */ PGMHVUSTATE State; pgmLock(pVM); STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncCR3HandlerVirtualUpdate), a); State.pVM = pVM; State.fTodo = pVM->pgm.s.fSyncFlags; State.cr4 = cr4; RTAvlroGCPtrDoWithAll(&pVM->pgm.s.CTXSUFF(pTrees)->VirtHandlers, true, PGM_GST_NAME(VirtHandlerUpdateOne), &State); STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncCR3HandlerVirtualUpdate), a); /* * Set / reset bits? */ if (State.fTodo & PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL) { STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncCR3HandlerVirtualReset), b); Log(("pgmR3VirtualHandlersUpdate: resets bits\n")); RTAvlroGCPtrDoWithAll(&pVM->pgm.s.CTXSUFF(pTrees)->VirtHandlers, true, pgmHandlerVirtualResetOne, pVM); pVM->pgm.s.fSyncFlags &= ~PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL; STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncCR3HandlerVirtualReset), b); } pgmUnlock(pVM); return !!(State.fTodo & PGM_SYNC_UPDATE_PAGE_BIT_VIRTUAL); #else /* real / protected */ return false; #endif } #if PGM_GST_TYPE == PGM_TYPE_32BIT && !defined(IN_RING3) /** * Write access handler for the Guest CR3 page in 32-bit mode. * * This will try interpret the instruction, if failure fail back to the recompiler. * Check if the changed PDEs are marked present and conflicts with our * mappings. If conflict, we'll switch to the host context and resolve it there * * @returns VBox status code (appropritate for trap handling and GC return). * @param pVM VM Handle. * @param uErrorCode CPU Error code. * @param pRegFrame Trap register frame. * @param pvFault The fault address (cr2). * @param GCPhysFault The GC physical address corresponding to pvFault. * @param pvUser User argument. */ PGM_GST_DECL(int, WriteHandlerCR3)(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser) { AssertMsg(!pVM->pgm.s.fMappingsFixed, ("Shouldn't be registered when mappings are fixed!\n")); /* * Try interpret the instruction. */ uint32_t cb; int rc = EMInterpretInstruction(pVM, pRegFrame, pvFault, &cb); if (VBOX_SUCCESS(rc) && cb) { /* * Check if the modified PDEs are present and mappings. */ const RTGCUINTPTR offPD = GCPhysFault & PAGE_OFFSET_MASK; const unsigned iPD1 = offPD / sizeof(X86PDE); const unsigned iPD2 = (offPD + cb - 1) / sizeof(X86PDE); Assert(cb > 0 && cb <= 8); Assert(iPD1 < RT_ELEMENTS(pVM->pgm.s.CTXSUFF(pGuestPD)->a)); /// @todo R3/R0 separation. Assert(iPD2 < RT_ELEMENTS(pVM->pgm.s.CTXSUFF(pGuestPD)->a)); #ifdef DEBUG Log(("pgmXXGst32BitWriteHandlerCR3: emulated change to PD %#x addr=%VGv\n", iPD1, iPD1 << X86_PD_SHIFT)); if (iPD1 != iPD2) Log(("pgmXXGst32BitWriteHandlerCR3: emulated change to PD %#x addr=%VGv\n", iPD2, iPD2 << X86_PD_SHIFT)); #endif if (!pVM->pgm.s.fMappingsFixed) { PX86PD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD); if ( ( pPDSrc->a[iPD1].n.u1Present && pgmGetMapping(pVM, (RTGCPTR)(iPD1 << X86_PD_SHIFT)) ) || ( iPD1 != iPD2 && pPDSrc->a[iPD2].n.u1Present && pgmGetMapping(pVM, (RTGCPTR)(iPD2 << X86_PD_SHIFT)) ) ) { STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteConflict); VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); if (rc == VINF_SUCCESS) rc = VINF_PGM_SYNC_CR3; Log(("pgmXXGst32BitWriteHandlerCR3: detected conflict iPD1=%#x iPD2=%#x - returns %Rrc\n", iPD1, iPD2, rc)); return rc; } } STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteHandled); } else { Assert(VBOX_FAILURE(rc)); if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EMULATE_INSTR_PD_FAULT; Log(("pgmXXGst32BitWriteHandlerCR3: returns %Rrc\n", rc)); STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteUnhandled); } return rc; } #endif /* PGM_TYPE_32BIT && !IN_RING3 */ #if PGM_GST_TYPE == PGM_TYPE_PAE && !defined(IN_RING3) /** * Write access handler for the Guest CR3 page in PAE mode. * * This will try interpret the instruction, if failure fail back to the recompiler. * Check if the changed PDEs are marked present and conflicts with our * mappings. If conflict, we'll switch to the host context and resolve it there * * @returns VBox status code (appropritate for trap handling and GC return). * @param pVM VM Handle. * @param uErrorCode CPU Error code. * @param pRegFrame Trap register frame. * @param pvFault The fault address (cr2). * @param GCPhysFault The GC physical address corresponding to pvFault. * @param pvUser User argument. */ PGM_GST_DECL(int, WriteHandlerCR3)(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser) { AssertMsg(!pVM->pgm.s.fMappingsFixed, ("Shouldn't be registered when mappings are fixed!\n")); /* * Try interpret the instruction. */ uint32_t cb; int rc = EMInterpretInstruction(pVM, pRegFrame, pvFault, &cb); if (VBOX_SUCCESS(rc) && cb) { /* * Check if any of the PDs have changed. * We'll simply check all of them instead of figuring out which one/two to check. */ for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++) { if ( CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].n.u1Present && ( CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].u & X86_PDPE_PG_MASK) != pVM->pgm.s.aGCPhysGstPaePDsMonitored[i]) { /* * The PDPE has changed. * We will schedule a monitoring update for the next TLB Flush, * InvalidatePage or SyncCR3. * * This isn't perfect, because a lazy page sync might be dealing with an half * updated PDPE. However, we assume that the guest OS is disabling interrupts * and being extremely careful (cmpxchg8b) when updating a PDPE where it's * executing. */ pVM->pgm.s.fSyncFlags |= PGM_SYNC_MONITOR_CR3; Log(("pgmXXGstPaeWriteHandlerCR3: detected updated PDPE; [%d] = %#llx, Old GCPhys=%VGp\n", i, CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].u, pVM->pgm.s.aGCPhysGstPaePDsMonitored[i])); } } STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteHandled); } else { Assert(VBOX_FAILURE(rc)); STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteUnhandled); if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EMULATE_INSTR_PD_FAULT; } Log(("pgmXXGstPaeWriteHandlerCR3: returns %Rrc\n", rc)); return rc; } /** * Write access handler for the Guest PDs in PAE mode. * * This will try interpret the instruction, if failure fail back to the recompiler. * Check if the changed PDEs are marked present and conflicts with our * mappings. If conflict, we'll switch to the host context and resolve it there * * @returns VBox status code (appropritate for trap handling and GC return). * @param pVM VM Handle. * @param uErrorCode CPU Error code. * @param pRegFrame Trap register frame. * @param pvFault The fault address (cr2). * @param GCPhysFault The GC physical address corresponding to pvFault. * @param pvUser User argument. */ PGM_GST_DECL(int, WriteHandlerPD)(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser) { AssertMsg(!pVM->pgm.s.fMappingsFixed, ("Shouldn't be registered when mappings are fixed!\n")); /* * Try interpret the instruction. */ uint32_t cb; int rc = EMInterpretInstruction(pVM, pRegFrame, pvFault, &cb); if (VBOX_SUCCESS(rc) && cb) { /* * Figure out which of the 4 PDs this is. */ RTGCUINTPTR i; for (i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++) if (CTXSUFF(pVM->pgm.s.pGstPaePDPT)->a[i].u == (GCPhysFault & X86_PTE_PAE_PG_MASK)) { PX86PDPAE pPDSrc = pgmGstGetPaePD(&pVM->pgm.s, i << X86_PDPT_SHIFT); const RTGCUINTPTR offPD = GCPhysFault & PAGE_OFFSET_MASK; const unsigned iPD1 = offPD / sizeof(X86PDEPAE); const unsigned iPD2 = (offPD + cb - 1) / sizeof(X86PDEPAE); Assert(cb > 0 && cb <= 8); Assert(iPD1 < X86_PG_PAE_ENTRIES); Assert(iPD2 < X86_PG_PAE_ENTRIES); #ifdef DEBUG Log(("pgmXXGstPaeWriteHandlerPD: emulated change to i=%d iPD1=%#05x (%VGv)\n", i, iPD1, (i << X86_PDPT_SHIFT) | (iPD1 << X86_PD_PAE_SHIFT))); if (iPD1 != iPD2) Log(("pgmXXGstPaeWriteHandlerPD: emulated change to i=%d iPD2=%#05x (%VGv)\n", i, iPD2, (i << X86_PDPT_SHIFT) | (iPD2 << X86_PD_PAE_SHIFT))); #endif if (!pVM->pgm.s.fMappingsFixed) { if ( ( pPDSrc->a[iPD1].n.u1Present && pgmGetMapping(pVM, (RTGCPTR)((i << X86_PDPT_SHIFT) | (iPD1 << X86_PD_PAE_SHIFT))) ) || ( iPD1 != iPD2 && pPDSrc->a[iPD2].n.u1Present && pgmGetMapping(pVM, (RTGCPTR)((i << X86_PDPT_SHIFT) | (iPD2 << X86_PD_PAE_SHIFT))) ) ) { Log(("pgmXXGstPaeWriteHandlerPD: detected conflict iPD1=%#x iPD2=%#x\n", iPD1, iPD2)); STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteConflict); VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); return VINF_PGM_SYNC_CR3; } } break; /* ASSUMES no duplicate entries... */ } Assert(i < 4); STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteHandled); } else { Assert(VBOX_FAILURE(rc)); if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EMULATE_INSTR_PD_FAULT; else Log(("pgmXXGst32BitWriteHandlerCR3: returns %Rrc\n", rc)); STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestCR3WriteUnhandled); } return rc; } #endif /* PGM_TYPE_PAE && !IN_RING3 */