PGMAllBth.h@ 7873

Last change on this file since 7873 was 7873, checked in by vboxsync, 17 years ago
AssertCR3: check the 4 PDPTs too in PAE legacy mode
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File size: 155.4 KB

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1	/* $Id: PGMAllBth.h 7873 2008-04-10 15:46:31Z vboxsync $ */
2	/** @file
3	* VBox - Page Manager, Shadow+Guest Paging Template - All context code.
4	*
5	* This file is a big challenge!
6	*/
7
8	/*
9	* Copyright (C) 2006-2007 innotek GmbH
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*/
19
20	/*******************************************************************************
21	* Internal Functions *
22	*******************************************************************************/
23	__BEGIN_DECLS
24	PGM_BTH_DECL(int, Trap0eHandler)(PVM pVM, RTGCUINT uErr, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault);
25	PGM_BTH_DECL(int, InvalidatePage)(PVM pVM, RTGCUINTPTR GCPtrPage);
26	PGM_BTH_DECL(int, SyncPage)(PVM pVM, GSTPDE PdeSrc, RTGCUINTPTR GCPtrPage, unsigned cPages, unsigned uErr);
27	PGM_BTH_DECL(int, CheckPageFault)(PVM pVM, uint32_t uErr, PSHWPDE pPdeDst, PGSTPDE pPdeSrc, RTGCUINTPTR GCPtrPage);
28	PGM_BTH_DECL(int, SyncPT)(PVM pVM, unsigned iPD, PGSTPD pPDSrc, RTGCUINTPTR GCPtrPage);
29	PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVM pVM, RTGCUINTPTR Addr, unsigned fPage, unsigned uErr);
30	PGM_BTH_DECL(int, PrefetchPage)(PVM pVM, RTGCUINTPTR GCPtrPage);
31	PGM_BTH_DECL(int, SyncCR3)(PVM pVM, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal);
32	#ifdef VBOX_STRICT
33	PGM_BTH_DECL(unsigned, AssertCR3)(PVM pVM, uint64_t cr3, uint64_t cr4, RTGCUINTPTR GCPtr = 0, RTGCUINTPTR cb = ~(RTGCUINTPTR)0);
34	#endif
35	#ifdef PGMPOOL_WITH_USER_TRACKING
36	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackDeref)(PVM pVM, PPGMPOOLPAGE pShwPage, RTHCPHYS HCPhys);
37	#endif
38	__END_DECLS
39
40
41	/* Filter out some illegal combinations of guest and shadow paging, so we can remove redundant checks inside functions. */
42	#if PGM_GST_TYPE == PGM_TYPE_PAE && PGM_SHW_TYPE != PGM_TYPE_PAE
43	#error "Invalid combination; PAE guest implies PAE shadow"
44	#endif
45
46	#if (PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
47	&& !(PGM_SHW_TYPE == PGM_TYPE_32BIT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE)
48	#error "Invalid combination; real or protected mode without paging implies 32 bits or PAE shadow paging."
49	#endif
50
51	#if (PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_PAE) \
52	&& !(PGM_SHW_TYPE == PGM_TYPE_32BIT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE)
53	#error "Invalid combination; 32 bits guest paging or PAE implies 32 bits or PAE shadow paging."
54	#endif
55
56	#if (PGM_GST_TYPE == PGM_TYPE_AMD64 && PGM_SHW_TYPE != PGM_TYPE_AMD64)
57	\|\| (PGM_SHW_TYPE == PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_AMD64)
58	#error "Invalid combination; AMD64 guest implies AMD64 shadow and vice versa"
59	#endif
60
61	/**
62	* #PF Handler for raw-mode guest execution.
63	*
64	* @returns VBox status code (appropriate for trap handling and GC return).
65	* @param pVM VM Handle.
66	* @param uErr The trap error code.
67	* @param pRegFrame Trap register frame.
68	* @param pvFault The fault address.
69	*/
70	PGM_BTH_DECL(int, Trap0eHandler)(PVM pVM, RTGCUINT uErr, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault)
71	{
72	#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
73
74	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_PAE
75	/*
76	* Hide the instruction fetch trap indicator for now.
77	*/
78	/** @todo NXE will change this and we must fix NXE in the switcher too! */
79	if (uErr & X86_TRAP_PF_ID)
80	{
81	uErr &= ~X86_TRAP_PF_ID;
82	TRPMSetErrorCode(pVM, uErr);
83	}
84	# endif
85
86	/*
87	* Get PDs.
88	*/
89	int rc;
90	# if PGM_WITH_PAGING(PGM_GST_TYPE)
91	# if PGM_GST_TYPE == PGM_TYPE_32BIT
92	const unsigned iPDSrc = (RTGCUINTPTR)pvFault >> GST_PD_SHIFT;
93	PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD);
94	# else /* PAE */
95	unsigned iPDSrc;
96	PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, (RTGCUINTPTR)pvFault, &iPDSrc);
97	# endif
98	# else
99	PGSTPD pPDSrc = NULL;
100	const unsigned iPDSrc = 0;
101	# endif
102
103	const unsigned iPDDst = (RTGCUINTPTR)pvFault >> SHW_PD_SHIFT;
104	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
105	PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD);
106	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
107	PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]; /* We treat this as a PD with 2048 entries. */
108
109	# if PGM_GST_TYPE == PGM_TYPE_PAE
110	/* Did we mark the PDPT as not present in SyncCR3? */
111	unsigned iPDPTE = ((RTGCUINTPTR)pvFault >> SHW_PDPT_SHIFT) & SHW_PDPT_MASK;
112	if (!pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present)
113	{
114	pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present = 1;
115	}
116	# endif
117	# else
118	AssertFailed();
119	# endif
120
121	# if PGM_WITH_PAGING(PGM_GST_TYPE)
122	# ifdef PGM_SYNC_DIRTY_BIT
123	/*
124	* If we successfully correct the write protection fault due to dirty bit
125	* tracking, or this page fault is a genuine one, then return immediately.
126	*/
127	STAM_PROFILE_START(&pVM->pgm.s.StatCheckPageFault, e);
128	rc = PGM_BTH_NAME(CheckPageFault)(pVM, uErr, &pPDDst->a[iPDDst], &pPDSrc->a[iPDSrc], (RTGCUINTPTR)pvFault);
129	STAM_PROFILE_STOP(&pVM->pgm.s.StatCheckPageFault, e);
130	if ( rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT
131	\|\| rc == VINF_EM_RAW_GUEST_TRAP)
132	{
133	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution)
134	= rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? &pVM->pgm.s.StatTrap0eDirtyAndAccessedBits : &pVM->pgm.s.StatTrap0eGuestTrap; });
135	LogBird(("Trap0eHandler: returns %s\n", rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? "VINF_SUCCESS" : "VINF_EM_RAW_GUEST_TRAP"));
136	return rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT ? VINF_SUCCESS : rc;
137	}
138	# endif
139
140	STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0ePD[iPDSrc]);
141	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
142
143	/*
144	* A common case is the not-present error caused by lazy page table syncing.
145	*
146	* It is IMPORTANT that we weed out any access to non-present shadow PDEs here
147	* so we can safely assume that the shadow PT is present when calling SyncPage later.
148	*
149	* On failure, we ASSUME that SyncPT is out of memory or detected some kind
150	* of mapping conflict and defer to SyncCR3 in R3.
151	* (Again, we do NOT support access handlers for non-present guest pages.)
152	*
153	*/
154	# if PGM_WITH_PAGING(PGM_GST_TYPE)
155	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
156	# else
157	GSTPDE PdeSrc;
158	PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */
159	PdeSrc.n.u1Present = 1;
160	PdeSrc.n.u1Write = 1;
161	PdeSrc.n.u1Accessed = 1;
162	PdeSrc.n.u1User = 1;
163	# endif
164	if ( !(uErr & X86_TRAP_PF_P) /* not set means page not present instead of page protection violation */
165	&& !pPDDst->a[iPDDst].n.u1Present
166	&& PdeSrc.n.u1Present
167	)
168
169	{
170	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eSyncPT; });
171	STAM_PROFILE_START(&pVM->pgm.s.StatLazySyncPT, f);
172	LogFlow(("=>SyncPT %04x = %08x\n", iPDSrc, PdeSrc.au32[0]));
173	rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, (RTGCUINTPTR)pvFault);
174	if (VBOX_SUCCESS(rc))
175	{
176	STAM_PROFILE_STOP(&pVM->pgm.s.StatLazySyncPT, f);
177	return rc;
178	}
179	Log(("SyncPT: %d failed!! rc=%d\n", iPDSrc, rc));
180	VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */
181	STAM_PROFILE_STOP(&pVM->pgm.s.StatLazySyncPT, f);
182	return VINF_PGM_SYNC_CR3;
183	}
184
185	# if PGM_WITH_PAGING(PGM_GST_TYPE)
186	/*
187	* Check if this address is within any of our mappings.
188	*
189	* This is very fast and it's gonna save us a bit of effort below and prevent
190	* us from screwing ourself with MMIO2 pages which have a GC Mapping (VRam).
191	* (BTW, it's impossible to have physical access handlers in a mapping.)
192	*/
193	if (pgmMapAreMappingsEnabled(&pVM->pgm.s))
194	{
195	STAM_PROFILE_START(&pVM->pgm.s.StatMapping, a);
196	PPGMMAPPING pMapping = CTXALLSUFF(pVM->pgm.s.pMappings);
197	for ( ; pMapping; pMapping = CTXALLSUFF(pMapping->pNext))
198	{
199	if ((RTGCUINTPTR)pvFault < (RTGCUINTPTR)pMapping->GCPtr)
200	break;
201	if ((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pMapping->GCPtr < pMapping->cb)
202	{
203	/*
204	* The first thing we check is if we've got an undetected conflict.
205	*/
206	if (!pVM->pgm.s.fMappingsFixed)
207	{
208	unsigned iPT = pMapping->cPTs;
209	while (iPT-- > 0)
210	if (pPDSrc->a[iPDSrc + iPT].n.u1Present)
211	{
212	STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eConflicts);
213	Log(("Trap0e: Detected Conflict %VGv-%VGv\n", pMapping->GCPtr, pMapping->GCPtrLast));
214	VM_FF_SET(pVM, VM_FF_PGM_SYNC_CR3); /** @todo no need to do global sync,right? */
215	STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a);
216	return VINF_PGM_SYNC_CR3;
217	}
218	}
219
220	/*
221	* Check if the fault address is in a virtual page access handler range.
222	*/
223	PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->HyperVirtHandlers, pvFault);
224	if ( pCur
225	&& (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb
226	&& uErr & X86_TRAP_PF_RW)
227	{
228	# ifdef IN_GC
229	STAM_PROFILE_START(&pCur->Stat, h);
230	rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr);
231	STAM_PROFILE_STOP(&pCur->Stat, h);
232	# else
233	AssertFailed();
234	rc = VINF_EM_RAW_EMULATE_INSTR; /* can't happen with VMX */
235	# endif
236	STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eMapHandler);
237	STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a);
238	return rc;
239	}
240
241	/*
242	* Pretend we're not here and let the guest handle the trap.
243	*/
244	TRPMSetErrorCode(pVM, uErr & ~X86_TRAP_PF_P);
245	STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eMap);
246	LogFlow(("PGM: Mapping access -> route trap to recompiler!\n"));
247	STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a);
248	return VINF_EM_RAW_GUEST_TRAP;
249	}
250	}
251	STAM_PROFILE_STOP(&pVM->pgm.s.StatMapping, a);
252	} /* pgmAreMappingsEnabled(&pVM->pgm.s) */
253	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
254
255	/*
256	* Check if this fault address is flagged for special treatment,
257	* which means we'll have to figure out the physical address and
258	* check flags associated with it.
259	*
260	* ASSUME that we can limit any special access handling to pages
261	* in page tables which the guest believes to be present.
262	*/
263	if (PdeSrc.n.u1Present)
264	{
265	RTGCPHYS GCPhys = NIL_RTGCPHYS;
266
267	# if PGM_WITH_PAGING(PGM_GST_TYPE)
268	uint32_t cr4 = CPUMGetGuestCR4(pVM);
269	if ( PdeSrc.b.u1Size
270	&& (cr4 & X86_CR4_PSE))
271	GCPhys = (PdeSrc.u & GST_PDE_BIG_PG_MASK)
272	\| ((RTGCPHYS)pvFault & (GST_BIG_PAGE_OFFSET_MASK ^ PAGE_OFFSET_MASK));
273	else
274	{
275	PGSTPT pPTSrc;
276	rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc);
277	if (VBOX_SUCCESS(rc))
278	{
279	unsigned iPTESrc = ((RTGCUINTPTR)pvFault >> GST_PT_SHIFT) & GST_PT_MASK;
280	if (pPTSrc->a[iPTESrc].n.u1Present)
281	GCPhys = pPTSrc->a[iPTESrc].u & GST_PTE_PG_MASK;
282	}
283	}
284	# else
285	/* No paging so the fault address is the physical address */
286	GCPhys = (RTGCPHYS)((RTGCUINTPTR)pvFault & ~PAGE_OFFSET_MASK);
287	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
288
289	/*
290	* If we have a GC address we'll check if it has any flags set.
291	*/
292	if (GCPhys != NIL_RTGCPHYS)
293	{
294	STAM_PROFILE_START(&pVM->pgm.s.StatHandlers, b);
295
296	PPGMPAGE pPage;
297	rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage);
298	if (VBOX_SUCCESS(rc))
299	{
300	if (PGM_PAGE_HAS_ANY_HANDLERS(pPage))
301	{
302	if (PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage))
303	{
304	/*
305	* Physical page access handler.
306	*/
307	const RTGCPHYS GCPhysFault = GCPhys \| ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK);
308	PPGMPHYSHANDLER pCur = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->PhysHandlers, GCPhysFault);
309	if (pCur)
310	{
311	# ifdef PGM_SYNC_N_PAGES
312	/*
313	* If the region is write protected and we got a page not present fault, then sync
314	* the pages. If the fault was caused by a read, then restart the instruction.
315	* In case of write access continue to the GC write handler.
316	*
317	* ASSUMES that there is only one handler per page or that they have similar write properties.
318	*/
319	if ( pCur->enmType == PGMPHYSHANDLERTYPE_PHYSICAL_WRITE
320	&& !(uErr & X86_TRAP_PF_P))
321	{
322	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr);
323	if ( VBOX_FAILURE(rc)
324	\|\| !(uErr & X86_TRAP_PF_RW)
325	\|\| rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE)
326	{
327	AssertRC(rc);
328	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync);
329	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
330	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndPhys; });
331	return rc;
332	}
333	}
334	# endif
335
336	AssertMsg( pCur->enmType != PGMPHYSHANDLERTYPE_PHYSICAL_WRITE
337	\|\| (pCur->enmType == PGMPHYSHANDLERTYPE_PHYSICAL_WRITE && (uErr & X86_TRAP_PF_RW)),
338	("Unexpected trap for physical handler: %08X (phys=%08x) HCPhys=%X uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType));
339
340	#if defined(IN_GC) \|\| defined(IN_RING0)
341	if (CTXALLSUFF(pCur->pfnHandler))
342	{
343	STAM_PROFILE_START(&pCur->Stat, h);
344	rc = pCur->CTXALLSUFF(pfnHandler)(pVM, uErr, pRegFrame, pvFault, GCPhysFault, CTXALLSUFF(pCur->pvUser));
345	STAM_PROFILE_STOP(&pCur->Stat, h);
346	}
347	else
348	#endif
349	rc = VINF_EM_RAW_EMULATE_INSTR;
350	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersPhysical);
351	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
352	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndPhys; });
353	return rc;
354	}
355	}
356	# if PGM_WITH_PAGING(PGM_GST_TYPE)
357	else
358	{
359	# ifdef PGM_SYNC_N_PAGES
360	/*
361	* If the region is write protected and we got a page not present fault, then sync
362	* the pages. If the fault was caused by a read, then restart the instruction.
363	* In case of write access continue to the GC write handler.
364	*/
365	if ( PGM_PAGE_GET_HNDL_VIRT_STATE(pPage) < PGM_PAGE_HNDL_PHYS_STATE_ALL
366	&& !(uErr & X86_TRAP_PF_P))
367	{
368	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr);
369	if ( VBOX_FAILURE(rc)
370	\|\| rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE
371	\|\| !(uErr & X86_TRAP_PF_RW))
372	{
373	AssertRC(rc);
374	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync);
375	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
376	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndVirt; });
377	return rc;
378	}
379	}
380	# endif
381	/*
382	* Ok, it's an virtual page access handler.
383	*
384	* Since it's faster to search by address, we'll do that first
385	* and then retry by GCPhys if that fails.
386	*/
387	/** @todo r=bird: perhaps we should consider looking up by physical address directly now? */
388	/** @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
389	* page was changed without us noticing it (not-present -> present without invlpg or mov cr3, xxx)
390	*/
391	PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->VirtHandlers, pvFault);
392	if (pCur)
393	{
394	AssertMsg(!((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb)
395	\|\| ( pCur->enmType != PGMVIRTHANDLERTYPE_WRITE
396	\|\| !(uErr & X86_TRAP_PF_P)
397	\|\| (pCur->enmType == PGMVIRTHANDLERTYPE_WRITE && (uErr & X86_TRAP_PF_RW))),
398	("Unexpected trap for virtual handler: %VGv (phys=%VGp) HCPhys=%HGp uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType));
399
400	if ( (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb
401	&& ( uErr & X86_TRAP_PF_RW
402	\|\| pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) )
403	{
404	# ifdef IN_GC
405	STAM_PROFILE_START(&pCur->Stat, h);
406	rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr);
407	STAM_PROFILE_STOP(&pCur->Stat, h);
408	# else
409	rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */
410	# endif
411	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtual);
412	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
413	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; });
414	return rc;
415	}
416	/* Unhandled part of a monitored page */
417	}
418	else
419	{
420	/* Check by physical address. */
421	PPGMVIRTHANDLER pCur;
422	unsigned iPage;
423	rc = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys + ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK),
424	&pCur, &iPage);
425	Assert(VBOX_SUCCESS(rc) \|\| !pCur);
426	if ( pCur
427	&& ( uErr & X86_TRAP_PF_RW
428	\|\| pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) )
429	{
430	Assert((pCur->aPhysToVirt[iPage].Core.Key & X86_PTE_PAE_PG_MASK) == GCPhys);
431	# ifdef IN_GC
432	RTGCUINTPTR off = (iPage << PAGE_SHIFT) + ((RTGCUINTPTR)pvFault & PAGE_OFFSET_MASK) - ((RTGCUINTPTR)pCur->GCPtr & PAGE_OFFSET_MASK);
433	Assert(off < pCur->cb);
434	STAM_PROFILE_START(&pCur->Stat, h);
435	rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, off);
436	STAM_PROFILE_STOP(&pCur->Stat, h);
437	# else
438	rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */
439	# endif
440	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtualByPhys);
441	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
442	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; });
443	return rc;
444	}
445	}
446	}
447	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
448
449	/*
450	* There is a handled area of the page, but this fault doesn't belong to it.
451	* We must emulate the instruction.
452	*
453	* To avoid crashing (non-fatal) in the interpreter and go back to the recompiler
454	* we first check if this was a page-not-present fault for a page with only
455	* write access handlers. Restart the instruction if it wasn't a write access.
456	*/
457	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersUnhandled);
458
459	if ( !PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)
460	&& !(uErr & X86_TRAP_PF_P))
461	{
462	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr);
463	if ( VBOX_FAILURE(rc)
464	\|\| rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE
465	\|\| !(uErr & X86_TRAP_PF_RW))
466	{
467	AssertRC(rc);
468	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersOutOfSync);
469	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
470	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncHndPhys; });
471	return rc;
472	}
473	}
474
475	/** @todo This particular case can cause quite a lot of overhead. E.g. early stage of kernel booting in Ubuntu 6.06
476	* It's writing to an unhandled part of the LDT page several million times.
477	*/
478	rc = PGMInterpretInstruction(pVM, pRegFrame, pvFault);
479	LogFlow(("PGM: PGMInterpretInstruction -> rc=%d HCPhys=%RHp%s%s\n",
480	rc, pPage->HCPhys,
481	PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage) ? " phys" : "",
482	PGM_PAGE_HAS_ANY_VIRTUAL_HANDLERS(pPage) ? " virt" : ""));
483	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
484	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndUnhandled; });
485	return rc;
486	} /* if any kind of handler */
487
488	# if PGM_WITH_PAGING(PGM_GST_TYPE)
489	if (uErr & X86_TRAP_PF_P)
490	{
491	/*
492	* The page isn't marked, but it might still be monitored by a virtual page access handler.
493	* (ASSUMES no temporary disabling of virtual handlers.)
494	*/
495	/** @todo r=bird: Since the purpose is to catch out of sync pages with virtual handler(s) here,
496	* we should correct both the shadow page table and physical memory flags, and not only check for
497	* accesses within the handler region but for access to pages with virtual handlers. */
498	PPGMVIRTHANDLER pCur = (PPGMVIRTHANDLER)RTAvlroGCPtrRangeGet(&CTXSUFF(pVM->pgm.s.pTrees)->VirtHandlers, pvFault);
499	if (pCur)
500	{
501	AssertMsg( !((RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb)
502	\|\| ( pCur->enmType != PGMVIRTHANDLERTYPE_WRITE
503	\|\| !(uErr & X86_TRAP_PF_P)
504	\|\| (pCur->enmType == PGMVIRTHANDLERTYPE_WRITE && (uErr & X86_TRAP_PF_RW))),
505	("Unexpected trap for virtual handler: %08X (phys=%08x) HCPhys=%X uErr=%X, enum=%d\n", pvFault, GCPhys, pPage->HCPhys, uErr, pCur->enmType));
506
507	if ( (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr < pCur->cb
508	&& ( uErr & X86_TRAP_PF_RW
509	\|\| pCur->enmType != PGMVIRTHANDLERTYPE_WRITE ) )
510	{
511	# ifdef IN_GC
512	STAM_PROFILE_START(&pCur->Stat, h);
513	rc = CTXSUFF(pCur->pfnHandler)(pVM, uErr, pRegFrame, pvFault, pCur->GCPtr, (RTGCUINTPTR)pvFault - (RTGCUINTPTR)pCur->GCPtr);
514	STAM_PROFILE_STOP(&pCur->Stat, h);
515	# else
516	rc = VINF_EM_RAW_EMULATE_INSTR; /** @todo for VMX */
517	# endif
518	STAM_COUNTER_INC(&pVM->pgm.s.StatHandlersVirtualUnmarked);
519	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
520	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eHndVirt; });
521	return rc;
522	}
523	}
524	}
525	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
526	}
527	STAM_PROFILE_STOP(&pVM->pgm.s.StatHandlers, b);
528
529	# ifdef PGM_OUT_OF_SYNC_IN_GC
530	/*
531	* We are here only if page is present in Guest page tables and trap is not handled
532	* by our handlers.
533	* Check it for page out-of-sync situation.
534	*/
535	STAM_PROFILE_START(&pVM->pgm.s.StatOutOfSync, c);
536
537	if (!(uErr & X86_TRAP_PF_P))
538	{
539	/*
540	* Page is not present in our page tables.
541	* Try to sync it!
542	* BTW, fPageShw is invalid in this branch!
543	*/
544	if (uErr & X86_TRAP_PF_US)
545	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser);
546	else /* supervisor */
547	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor);
548
549	# if defined(LOG_ENABLED) && !defined(IN_RING0)
550	RTGCPHYS GCPhys;
551	uint64_t fPageGst;
552	PGMGstGetPage(pVM, pvFault, &fPageGst, &GCPhys);
553	Log(("Page out of sync: %p eip=%08x PdeSrc.n.u1User=%d fPageGst=%08llx GCPhys=%VGp scan=%d\n",
554	pvFault, pRegFrame->eip, PdeSrc.n.u1User, fPageGst, GCPhys, CSAMDoesPageNeedScanning(pVM, (RTGCPTR)pRegFrame->eip)));
555	# endif /* LOG_ENABLED */
556
557	# if PGM_WITH_PAGING(PGM_GST_TYPE) && !defined(IN_RING0)
558	if (CPUMGetGuestCPL(pVM, pRegFrame) == 0)
559	{
560	uint64_t fPageGst;
561	rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL);
562	if ( VBOX_SUCCESS(rc)
563	&& !(fPageGst & X86_PTE_US))
564	{
565	/* Note: can't check for X86_TRAP_ID bit, because that requires execute disable support on the CPU */
566	if ( pvFault == (RTGCPTR)pRegFrame->eip
567	\|\| (RTGCUINTPTR)pvFault - pRegFrame->eip < 8 /* instruction crossing a page boundary */
568	# ifdef CSAM_DETECT_NEW_CODE_PAGES
569	\|\| ( !PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)
570	&& CSAMDoesPageNeedScanning(pVM, (RTGCPTR)pRegFrame->eip)) /* any new code we encounter here */
571	# endif /* CSAM_DETECT_NEW_CODE_PAGES */
572	)
573	{
574	LogFlow(("CSAMExecFault %VGv\n", pRegFrame->eip));
575	rc = CSAMExecFault(pVM, (RTGCPTR)pRegFrame->eip);
576	if (rc != VINF_SUCCESS)
577	{
578	/*
579	* CSAM needs to perform a job in ring 3.
580	*
581	* Sync the page before going to the host context; otherwise we'll end up in a loop if
582	* CSAM fails (e.g. instruction crosses a page boundary and the next page is not present)
583	*/
584	LogFlow(("CSAM ring 3 job\n"));
585	int rc2 = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, 1, uErr);
586	AssertRC(rc2);
587
588	STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c);
589	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eCSAM; });
590	return rc;
591	}
592	}
593	# ifdef CSAM_DETECT_NEW_CODE_PAGES
594	else
595	if ( uErr == X86_TRAP_PF_RW
596	&& pRegFrame->ecx >= 0x100 /* early check for movswd count */
597	&& pRegFrame->ecx < 0x10000
598	)
599	{
600	/* In case of a write to a non-present supervisor shadow page, we'll take special precautions
601	* to detect loading of new code pages.
602	*/
603
604	/*
605	* Decode the instruction.
606	*/
607	RTGCPTR PC;
608	rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC);
609	if (rc == VINF_SUCCESS)
610	{
611	DISCPUSTATE Cpu;
612	uint32_t cbOp;
613	rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp);
614
615	/* For now we'll restrict this to rep movsw/d instructions */
616	if ( rc == VINF_SUCCESS
617	&& Cpu.pCurInstr->opcode == OP_MOVSWD
618	&& (Cpu.prefix & PREFIX_REP))
619	{
620	CSAMMarkPossibleCodePage(pVM, pvFault);
621	}
622	}
623	}
624	# endif /* CSAM_DETECT_NEW_CODE_PAGES */
625
626	/*
627	* Mark this page as safe.
628	*/
629	/** @todo not correct for pages that contain both code and data!! */
630	Log2(("CSAMMarkPage %p; scanned=%d\n", pvFault, true));
631	CSAMMarkPage(pVM, pvFault, true);
632	}
633	}
634	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) && !defined(IN_RING0) */
635	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, PGM_SYNC_NR_PAGES, uErr);
636	if (VBOX_SUCCESS(rc))
637	{
638	/* The page was successfully synced, return to the guest. */
639	STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c);
640	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSync; });
641	return VINF_SUCCESS;
642	}
643	}
644	else
645	{
646	/*
647	* A side effect of not flushing global PDEs are out of sync pages due
648	* to physical monitored regions, that are no longer valid.
649	* Assume for now it only applies to the read/write flag
650	*/
651	if (VBOX_SUCCESS(rc) && (uErr & X86_TRAP_PF_RW))
652	{
653	if (uErr & X86_TRAP_PF_US)
654	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser);
655	else /* supervisor */
656	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor);
657
658
659	/*
660	* 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.
661	*/
662	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)pvFault, 1, uErr);
663	if (VBOX_SUCCESS(rc))
664	{
665	/*
666	* Page was successfully synced, return to guest.
667	*/
668	# ifdef VBOX_STRICT
669	RTGCPHYS GCPhys;
670	uint64_t fPageGst;
671	rc = PGMGstGetPage(pVM, pvFault, &fPageGst, &GCPhys);
672	Assert(VBOX_SUCCESS(rc) && fPageGst & X86_PTE_RW);
673	LogFlow(("Obsolete physical monitor page out of sync %VGv - phys %VGp flags=%08llx\n", pvFault, GCPhys, (uint64_t)fPageGst));
674
675	uint64_t fPageShw;
676	rc = PGMShwGetPage(pVM, pvFault, &fPageShw, NULL);
677	Assert(VBOX_SUCCESS(rc) && fPageShw & X86_PTE_RW);
678	# endif /* VBOX_STRICT */
679	STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c);
680	STAM_STATS({ pVM->pgm.s.CTXSUFF(pStatTrap0eAttribution) = &pVM->pgm.s.StatTrap0eOutOfSyncObsHnd; });
681	return VINF_SUCCESS;
682	}
683
684	/* Check to see if we need to emulate the instruction as X86_CR0_WP has been cleared. */
685	if ( CPUMGetGuestCPL(pVM, pRegFrame) == 0
686	&& ((CPUMGetGuestCR0(pVM) & (X86_CR0_WP\|X86_CR0_PG)) == X86_CR0_PG)
687	&& (uErr & (X86_TRAP_PF_RW \| X86_TRAP_PF_P)) == (X86_TRAP_PF_RW \| X86_TRAP_PF_P))
688	{
689	uint64_t fPageGst;
690	rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL);
691	if ( VBOX_SUCCESS(rc)
692	&& !(fPageGst & X86_PTE_RW))
693	{
694	rc = PGMInterpretInstruction(pVM, pRegFrame, pvFault);
695	if (VBOX_SUCCESS(rc))
696	STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eWPEmulGC);
697	else
698	STAM_COUNTER_INC(&pVM->pgm.s.StatTrap0eWPEmulR3);
699	return rc;
700	}
701	else
702	AssertMsgFailed(("Unexpected r/w page %x flag=%x\n", pvFault, (uint32_t)fPageGst));
703	}
704
705	}
706
707	# if PGM_WITH_PAGING(PGM_GST_TYPE)
708	# ifdef VBOX_STRICT
709	/*
710	* Check for VMM page flags vs. Guest page flags consistency.
711	* Currently only for debug purposes.
712	*/
713	if (VBOX_SUCCESS(rc))
714	{
715	/* Get guest page flags. */
716	uint64_t fPageGst;
717	rc = PGMGstGetPage(pVM, pvFault, &fPageGst, NULL);
718	if (VBOX_SUCCESS(rc))
719	{
720	uint64_t fPageShw;
721	rc = PGMShwGetPage(pVM, pvFault, &fPageShw, NULL);
722
723	/*
724	* Compare page flags.
725	* Note: we have AVL, A, D bits desynched.
726	*/
727	AssertMsg((fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)) == (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)),
728	("Page flags mismatch! pvFault=%p GCPhys=%VGp fPageShw=%08llx fPageGst=%08llx\n", pvFault, GCPhys, fPageShw, fPageGst));
729	}
730	else
731	AssertMsgFailed(("PGMGstGetPage rc=%Vrc\n", rc));
732	}
733	else
734	AssertMsgFailed(("PGMGCGetPage rc=%Vrc\n", rc));
735	# endif /* VBOX_STRICT */
736	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
737	}
738	STAM_PROFILE_STOP(&pVM->pgm.s.StatOutOfSync, c);
739	# endif /* PGM_OUT_OF_SYNC_IN_GC */
740	}
741	else
742	{
743	/*
744	* Page not present in Guest OS or invalid page table address.
745	* This is potential virtual page access handler food.
746	*
747	* For the present we'll say that our access handlers don't
748	* work for this case - we've already discarded the page table
749	* not present case which is identical to this.
750	*
751	* When we perchance find we need this, we will probably have AVL
752	* trees (offset based) to operate on and we can measure their speed
753	* agains mapping a page table and probably rearrange this handling
754	* a bit. (Like, searching virtual ranges before checking the
755	* physical address.)
756	*/
757	}
758	}
759
760
761	# if PGM_WITH_PAGING(PGM_GST_TYPE)
762	/*
763	* Conclusion, this is a guest trap.
764	*/
765	LogFlow(("PGM: Unhandled #PF -> route trap to recompiler!\n"));
766	STAM_COUNTER_INC(&pVM->pgm.s.StatGCTrap0eUnhandled);
767	return VINF_EM_RAW_GUEST_TRAP;
768	# else
769	/* present, but not a monitored page; perhaps the guest is probing physical memory */
770	return VINF_EM_RAW_EMULATE_INSTR;
771	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
772
773
774	#else /* PGM_GST_TYPE != PGM_TYPE_32BIT */
775
776	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
777	return VERR_INTERNAL_ERROR;
778	#endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */
779	}
780
781
782	/**
783	* Emulation of the invlpg instruction.
784	*
785	*
786	* @returns VBox status code.
787	*
788	* @param pVM VM handle.
789	* @param GCPtrPage Page to invalidate.
790	*
791	* @remark ASSUMES that the guest is updating before invalidating. This order
792	* isn't required by the CPU, so this is speculative and could cause
793	* trouble.
794	*
795	* @todo Flush page or page directory only if necessary!
796	* @todo Add a #define for simply invalidating the page.
797	*/
798	PGM_BTH_DECL(int, InvalidatePage)(PVM pVM, RTGCUINTPTR GCPtrPage)
799	{
800	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
801	\|\| PGM_GST_TYPE == PGM_TYPE_PAE
802
803	LogFlow(("InvalidatePage %x\n", GCPtrPage));
804	/*
805	* Get the shadow PD entry and skip out if this PD isn't present.
806	* (Guessing that it is frequent for a shadow PDE to not be present, do this first.)
807	*/
808	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
809	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
810	PX86PDE pPdeDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst];
811	# else
812	PX86PDEPAE pPdeDst = &pVM->pgm.s.CTXMID(ap,PaePDs[0])->a[iPDDst];
813	# endif
814	const SHWPDE PdeDst = *pPdeDst;
815	if (!PdeDst.n.u1Present)
816	{
817	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePageSkipped));
818	return VINF_SUCCESS;
819	}
820
821	/*
822	* Get the guest PD entry and calc big page.
823	*/
824	# if PGM_GST_TYPE == PGM_TYPE_32BIT
825	PX86PD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD);
826	const unsigned iPDSrc = GCPtrPage >> GST_PD_SHIFT;
827	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
828	# else /* PAE */
829	unsigned iPDSrc;
830	PX86PDPAE pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc);
831	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
832	# endif
833
834	const uint32_t cr4 = CPUMGetGuestCR4(pVM);
835	const bool fIsBigPage = PdeSrc.b.u1Size && (cr4 & X86_CR4_PSE);
836
837	# ifdef IN_RING3
838	/*
839	* If a CR3 Sync is pending we may ignore the invalidate page operation
840	* depending on the kind of sync and if it's a global page or not.
841	* This doesn't make sense in GC/R0 so we'll skip it entirely there.
842	*/
843	# ifdef PGM_SKIP_GLOBAL_PAGEDIRS_ON_NONGLOBAL_FLUSH
844	if ( VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3)
845	\|\| ( VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3_NON_GLOBAL)
846	&& fIsBigPage
847	&& PdeSrc.b.u1Global
848	&& (cr4 & X86_CR4_PGE)
849	)
850	)
851	# else
852	if (VM_FF_ISPENDING(pVM, VM_FF_PGM_SYNC_CR3 \| VM_FF_PGM_SYNC_CR3_NON_GLOBAL) )
853	# endif
854	{
855	STAM_COUNTER_INC(&pVM->pgm.s.StatHCInvalidatePageSkipped);
856	return VINF_SUCCESS;
857	}
858	# endif /* IN_RING3 */
859
860
861	/*
862	* Deal with the Guest PDE.
863	*/
864	int rc = VINF_SUCCESS;
865	if (PdeSrc.n.u1Present)
866	{
867	if (PdeDst.u & PGM_PDFLAGS_MAPPING)
868	{
869	/*
870	* Conflict - Let SyncPT deal with it to avoid duplicate code.
871	*/
872	Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
873	Assert(PGMGetGuestMode(pVM) <= PGMMODE_32_BIT);
874	rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage);
875	}
876	else if ( PdeSrc.n.u1User != PdeDst.n.u1User
877	\|\| (!PdeSrc.n.u1Write && PdeDst.n.u1Write))
878	{
879	/*
880	* Mark not present so we can resync the PDE when it's used.
881	*/
882	LogFlow(("InvalidatePage: Out-of-sync at %VGp PdeSrc=%RX64 PdeDst=%RX64\n",
883	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
884	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
885	pPdeDst->u = 0;
886	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDOutOfSync));
887	PGM_INVL_GUEST_TLBS();
888	}
889	# ifdef PGM_SYNC_ACCESSED_BIT
890	else if (!PdeSrc.n.u1Accessed)
891	{
892	/*
893	* Mark not present so we can set the accessed bit.
894	*/
895	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
896	pPdeDst->u = 0;
897	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDNAs));
898	PGM_INVL_GUEST_TLBS();
899	}
900	# endif
901	else if (!fIsBigPage)
902	{
903	/*
904	* 4KB - page.
905	*/
906	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK);
907	RTGCPHYS GCPhys = PdeSrc.u & GST_PDE_PG_MASK;
908	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
909	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
910	GCPhys \|= (iPDDst & 1) * (PAGE_SIZE/2);
911	# endif
912	if (pShwPage->GCPhys == GCPhys)
913	{
914	# if 0 /* likely cause of a major performance regression; must be SyncPageWorkerTrackDeref then */
915	const unsigned iPTEDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
916	PSHWPT pPT = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
917	if (pPT->a[iPTEDst].n.u1Present)
918	{
919	# ifdef PGMPOOL_WITH_USER_TRACKING
920	/* This is very unlikely with caching/monitoring enabled. */
921	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPT->a[iPTEDst].u & SHW_PTE_PG_MASK);
922	# endif
923	pPT->a[iPTEDst].u = 0;
924	}
925	# else /* Syncing it here isn't 100% safe and it's probably not worth spending time syncing it. */
926	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0);
927	if (VBOX_SUCCESS(rc))
928	rc = VINF_SUCCESS;
929	# endif
930	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4KBPages));
931	PGM_INVL_PG(GCPtrPage);
932	}
933	else
934	{
935	/*
936	* The page table address changed.
937	*/
938	LogFlow(("InvalidatePage: Out-of-sync at %VGp PdeSrc=%RX64 PdeDst=%RX64 ShwGCPhys=%VGp iPDDst=%#x\n",
939	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u, pShwPage->GCPhys, iPDDst));
940	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
941	pPdeDst->u = 0;
942	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDOutOfSync));
943	PGM_INVL_GUEST_TLBS();
944	}
945	}
946	else
947	{
948	/*
949	* 4MB - page.
950	*/
951	/* Before freeing the page, check if anything really changed. */
952	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK);
953	RTGCPHYS GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK;
954	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
955	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
956	GCPhys \|= GCPtrPage & (1 << X86_PD_PAE_SHIFT);
957	# endif
958	if ( pShwPage->GCPhys == GCPhys
959	&& pShwPage->enmKind == BTH_PGMPOOLKIND_PT_FOR_BIG)
960	{
961	/* ASSUMES a the given bits are identical for 4M and normal PDEs */
962	/** @todo PAT */
963	# ifdef PGM_SYNC_DIRTY_BIT
964	if ( (PdeSrc.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD))
965	== (PdeDst.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD))
966	&& ( PdeSrc.b.u1Dirty /** @todo rainy day: What about read-only 4M pages? not very common, but still... */
967	\|\| (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)))
968	# else
969	if ( (PdeSrc.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD))
970	== (PdeDst.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD)))
971	# endif
972	{
973	LogFlow(("Skipping flush for big page containing %VGv (PD=%X)-> nothing has changed!\n", GCPtrPage, iPDSrc));
974	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4MBPagesSkip));
975	return VINF_SUCCESS;
976	}
977	}
978
979	/*
980	* Ok, the page table is present and it's been changed in the guest.
981	* If we're in host context, we'll just mark it as not present taking the lazy approach.
982	* We could do this for some flushes in GC too, but we need an algorithm for
983	* deciding which 4MB pages containing code likely to be executed very soon.
984	*/
985	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
986	pPdeDst->u = 0;
987	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePage4MBPages));
988	PGM_INVL_BIG_PG(GCPtrPage);
989	}
990	}
991	else
992	{
993	/*
994	* Page directory is not present, mark shadow PDE not present.
995	*/
996	if (!(PdeDst.u & PGM_PDFLAGS_MAPPING))
997	{
998	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
999	pPdeDst->u = 0;
1000	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDNPs));
1001	PGM_INVL_PG(GCPtrPage);
1002	}
1003	else
1004	{
1005	Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
1006	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,InvalidatePagePDMappings));
1007	}
1008	}
1009
1010	return rc;
1011
1012	#elif PGM_GST_TYPE == PGM_TYPE_AMD64
1013	//# error not implemented
1014	return VERR_INTERNAL_ERROR;
1015
1016	#else /* guest real and protected mode */
1017	/* There's no such thing as InvalidatePage when paging is disabled, so just ignore. */
1018	return VINF_SUCCESS;
1019	#endif
1020	}
1021
1022
1023	#ifdef PGMPOOL_WITH_USER_TRACKING
1024	/**
1025	* Update the tracking of shadowed pages.
1026	*
1027	* @param pVM The VM handle.
1028	* @param pShwPage The shadow page.
1029	* @param HCPhys The physical page we is being dereferenced.
1030	*/
1031	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackDeref)(PVM pVM, PPGMPOOLPAGE pShwPage, RTHCPHYS HCPhys)
1032	{
1033	# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
1034	STAM_PROFILE_START(&pVM->pgm.s.StatTrackDeref, a);
1035	LogFlow(("SyncPageWorkerTrackDeref: Damn HCPhys=%VHp pShwPage->idx=%#x!!!\n", HCPhys, pShwPage->idx));
1036
1037	/** @todo If this turns out to be a bottle neck (very likely) two things can be done:
1038	* 1. have a medium sized HCPhys -> GCPhys TLB (hash?)
1039	* 2. write protect all shadowed pages. I.e. implement caching.
1040	*/
1041	/*
1042	* Find the guest address.
1043	*/
1044	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
1045	pRam;
1046	pRam = CTXALLSUFF(pRam->pNext))
1047	{
1048	unsigned iPage = pRam->cb >> PAGE_SHIFT;
1049	while (iPage-- > 0)
1050	{
1051	if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
1052	{
1053	PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool);
1054	pgmTrackDerefGCPhys(pPool, pShwPage, &pRam->aPages[iPage]);
1055	pShwPage->cPresent--;
1056	pPool->cPresent--;
1057	STAM_PROFILE_STOP(&pVM->pgm.s.StatTrackDeref, a);
1058	return;
1059	}
1060	}
1061	}
1062
1063	for (;;)
1064	AssertReleaseMsgFailed(("HCPhys=%VHp wasn't found!\n", HCPhys));
1065	# else /* !PGMPOOL_WITH_GCPHYS_TRACKING */
1066	pShwPage->cPresent--;
1067	pVM->pgm.s.CTXSUFF(pPool)->cPresent--;
1068	# endif /* !PGMPOOL_WITH_GCPHYS_TRACKING */
1069	}
1070
1071
1072	/**
1073	* Update the tracking of shadowed pages.
1074	*
1075	* @param pVM The VM handle.
1076	* @param pShwPage The shadow page.
1077	* @param u16 The top 16-bit of the pPage->HCPhys.
1078	* @param pPage Pointer to the guest page. this will be modified.
1079	* @param iPTDst The index into the shadow table.
1080	*/
1081	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(PVM pVM, PPGMPOOLPAGE pShwPage, uint16_t u16, PPGMPAGE pPage, const unsigned iPTDst)
1082	{
1083	# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
1084	/*
1085	* We're making certain assumptions about the placement of cRef and idx.
1086	*/
1087	Assert(MM_RAM_FLAGS_IDX_SHIFT == 48);
1088	Assert(MM_RAM_FLAGS_CREFS_SHIFT > MM_RAM_FLAGS_IDX_SHIFT);
1089
1090	/*
1091	* Just deal with the simple first time here.
1092	*/
1093	if (!u16)
1094	{
1095	STAM_COUNTER_INC(&pVM->pgm.s.StatTrackVirgin);
1096	u16 = (1 << (MM_RAM_FLAGS_CREFS_SHIFT - MM_RAM_FLAGS_IDX_SHIFT)) \| pShwPage->idx;
1097	}
1098	else
1099	u16 = pgmPoolTrackPhysExtAddref(pVM, u16, pShwPage->idx);
1100
1101	/* write back, trying to be clever... */
1102	Log2(("SyncPageWorkerTrackAddRef: u16=%#x pPage->HCPhys=%VHp->%VHp iPTDst=%#x\n",
1103	u16, pPage->HCPhys, (pPage->HCPhys & MM_RAM_FLAGS_NO_REFS_MASK) \| ((uint64_t)u16 << MM_RAM_FLAGS_CREFS_SHIFT), iPTDst));
1104	((uint16_t )&pPage->HCPhys + 3) = u16; /** @todo PAGE FLAGS */
1105	# endif /* PGMPOOL_WITH_GCPHYS_TRACKING */
1106
1107	/* update statistics. */
1108	pVM->pgm.s.CTXSUFF(pPool)->cPresent++;
1109	pShwPage->cPresent++;
1110	if (pShwPage->iFirstPresent > iPTDst)
1111	pShwPage->iFirstPresent = iPTDst;
1112	}
1113	#endif /* PGMPOOL_WITH_USER_TRACKING */
1114
1115
1116	/**
1117	* Creates a 4K shadow page for a guest page.
1118	*
1119	* For 4M pages the caller must convert the PDE4M to a PTE, this includes adjusting the
1120	* physical address. The PdeSrc argument only the flags are used. No page structured
1121	* will be mapped in this function.
1122	*
1123	* @param pVM VM handle.
1124	* @param pPteDst Destination page table entry.
1125	* @param PdeSrc Source page directory entry (i.e. Guest OS page directory entry).
1126	* Can safely assume that only the flags are being used.
1127	* @param PteSrc Source page table entry (i.e. Guest OS page table entry).
1128	* @param pShwPage Pointer to the shadow page.
1129	* @param iPTDst The index into the shadow table.
1130	*
1131	* @remark Not used for 2/4MB pages!
1132	*/
1133	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorker)(PVM pVM, PSHWPTE pPteDst, GSTPDE PdeSrc, GSTPTE PteSrc, PPGMPOOLPAGE pShwPage, unsigned iPTDst)
1134	{
1135	if (PteSrc.n.u1Present)
1136	{
1137	/*
1138	* Find the ram range.
1139	*/
1140	PPGMPAGE pPage;
1141	int rc = pgmPhysGetPageEx(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK, &pPage);
1142	if (VBOX_SUCCESS(rc))
1143	{
1144	/** @todo investiage PWT, PCD and PAT. */
1145	/*
1146	* Make page table entry.
1147	*/
1148	const RTHCPHYS HCPhys = pPage->HCPhys; /** @todo FLAGS */
1149	SHWPTE PteDst;
1150	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage))
1151	{
1152	/** @todo r=bird: Are we actually handling dirty and access bits for pages with access handlers correctly? No. */
1153	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
1154	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))
1155	\| (HCPhys & X86_PTE_PAE_PG_MASK);
1156	else
1157	{
1158	LogFlow(("SyncPageWorker: monitored page (%VGp) -> mark not present\n", HCPhys));
1159	PteDst.u = 0;
1160	}
1161	/** @todo count these two kinds. */
1162	}
1163	else
1164	{
1165	#ifdef PGM_SYNC_DIRTY_BIT
1166	# ifdef PGM_SYNC_ACCESSED_BIT
1167	/*
1168	* If the page or page directory entry is not marked accessed,
1169	* we mark the page not present.
1170	*/
1171	if (!PteSrc.n.u1Accessed \|\| !PdeSrc.n.u1Accessed)
1172	{
1173	LogFlow(("SyncPageWorker: page and or page directory not accessed -> mark not present\n"));
1174	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,AccessedPage));
1175	PteDst.u = 0;
1176	}
1177	else
1178	# endif
1179	/*
1180	* If the page is not flagged as dirty and is writable, then make it read-only, so we can set the dirty bit
1181	* when the page is modified.
1182	*/
1183	if (!PteSrc.n.u1Dirty && (PdeSrc.n.u1Write & PteSrc.n.u1Write))
1184	{
1185	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPage));
1186	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))
1187	\| (HCPhys & X86_PTE_PAE_PG_MASK)
1188	\| PGM_PTFLAGS_TRACK_DIRTY;
1189	}
1190	else
1191	{
1192	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageSkipped));
1193	PteDst.u = (PteSrc.u & ~(X86_PTE_PAE_PG_MASK \| X86_PTE_AVL_MASK \| X86_PTE_PAT \| X86_PTE_PCD \| X86_PTE_PWT))
1194	\| (HCPhys & X86_PTE_PAE_PG_MASK);
1195	}
1196	#endif
1197	}
1198
1199	#ifdef PGMPOOL_WITH_USER_TRACKING
1200	/*
1201	* Keep user track up to date.
1202	*/
1203	if (PteDst.n.u1Present)
1204	{
1205	if (!pPteDst->n.u1Present)
1206	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst);
1207	else if ((pPteDst->u & SHW_PTE_PG_MASK) != (PteDst.u & SHW_PTE_PG_MASK))
1208	{
1209	Log2(("SyncPageWorker: deref! *pPteDst=%RX64 PteDst=%RX64\n", (uint64_t)pPteDst->u, (uint64_t)PteDst.u));
1210	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK);
1211	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst);
1212	}
1213	}
1214	else if (pPteDst->n.u1Present)
1215	{
1216	Log2(("SyncPageWorker: deref! *pPteDst=%RX64\n", (uint64_t)pPteDst->u));
1217	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK);
1218	}
1219	#endif /* PGMPOOL_WITH_USER_TRACKING */
1220
1221	/*
1222	* Update statistics and commit the entry.
1223	*/
1224	if (!PteSrc.n.u1Global)
1225	pShwPage->fSeenNonGlobal = true;
1226	*pPteDst = PteDst;
1227	}
1228	/* else MMIO or invalid page, we must handle them manually in the #PF handler. */
1229	/** @todo count these. */
1230	}
1231	else
1232	{
1233	/*
1234	* Page not-present.
1235	*/
1236	LogFlow(("SyncPageWorker: page not present in Pte\n"));
1237	#ifdef PGMPOOL_WITH_USER_TRACKING
1238	/* Keep user track up to date. */
1239	if (pPteDst->n.u1Present)
1240	{
1241	Log2(("SyncPageWorker: deref! *pPteDst=%RX64\n", (uint64_t)pPteDst->u));
1242	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVM, pShwPage, pPteDst->u & SHW_PTE_PG_MASK);
1243	}
1244	#endif /* PGMPOOL_WITH_USER_TRACKING */
1245	pPteDst->u = 0;
1246	/** @todo count these. */
1247	}
1248	}
1249
1250
1251	/**
1252	* Syncs a guest OS page.
1253	*
1254	* There are no conflicts at this point, neither is there any need for
1255	* page table allocations.
1256	*
1257	* @returns VBox status code.
1258	* @returns VINF_PGM_SYNCPAGE_MODIFIED_PDE if it modifies the PDE in any way.
1259	* @param pVM VM handle.
1260	* @param PdeSrc Page directory entry of the guest.
1261	* @param GCPtrPage Guest context page address.
1262	* @param cPages Number of pages to sync (PGM_SYNC_N_PAGES) (default=1).
1263	* @param uErr Fault error (X86_TRAP_PF_*).
1264	*/
1265	PGM_BTH_DECL(int, SyncPage)(PVM pVM, GSTPDE PdeSrc, RTGCUINTPTR GCPtrPage, unsigned cPages, unsigned uErr)
1266	{
1267	# if PGM_WITH_NX(PGM_GST_TYPE)
1268	bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE);
1269	# endif
1270	LogFlow(("SyncPage: GCPtrPage=%VGv cPages=%d uErr=%#x\n", GCPtrPage, cPages, uErr));
1271
1272	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
1273	\|\| PGM_GST_TYPE == PGM_TYPE_PAE
1274
1275	/*
1276	* Assert preconditions.
1277	*/
1278	STAM_COUNTER_INC(&pVM->pgm.s.StatGCSyncPagePD[(GCPtrPage >> X86_PD_SHIFT) & GST_PD_MASK]);
1279	Assert(PdeSrc.n.u1Present);
1280	Assert(cPages);
1281
1282	/*
1283	* Get the shadow PDE, find the shadow page table in the pool.
1284	*/
1285	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
1286	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1287	X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst];
1288	# else /* PAE */
1289	X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst];
1290	# endif
1291	Assert(PdeDst.n.u1Present);
1292	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK);
1293
1294	/*
1295	* Check that the page is present and that the shadow PDE isn't out of sync.
1296	*/
1297	const bool fBigPage = PdeSrc.b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE);
1298	RTGCPHYS GCPhys;
1299	if (!fBigPage)
1300	{
1301	GCPhys = PdeSrc.u & GST_PDE_PG_MASK;
1302	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1303	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
1304	GCPhys \|= (iPDDst & 1) * (PAGE_SIZE/2);
1305	# endif
1306	}
1307	else
1308	{
1309	GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK;
1310	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1311	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
1312	GCPhys \|= GCPtrPage & (1 << X86_PD_PAE_SHIFT);
1313	# endif
1314	}
1315	if ( pShwPage->GCPhys == GCPhys
1316	&& PdeSrc.n.u1Present
1317	&& (PdeSrc.n.u1User == PdeDst.n.u1User)
1318	&& (PdeSrc.n.u1Write == PdeDst.n.u1Write \|\| !PdeDst.n.u1Write)
1319	# if PGM_WITH_NX(PGM_GST_TYPE)
1320	&& (!fNoExecuteBitValid \|\| PdeSrc.n.u1NoExecute == PdeDst.n.u1NoExecute)
1321	# endif
1322	)
1323	{
1324	# ifdef PGM_SYNC_ACCESSED_BIT
1325	/*
1326	* Check that the PDE is marked accessed already.
1327	* Since we set the accessed bit before getting here on a #PF, this
1328	* check is only meant for dealing with non-#PF'ing paths.
1329	*/
1330	if (PdeSrc.n.u1Accessed)
1331	# endif
1332	{
1333	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
1334	if (!fBigPage)
1335	{
1336	/*
1337	* 4KB Page - Map the guest page table.
1338	*/
1339	PGSTPT pPTSrc;
1340	int rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc);
1341	if (VBOX_SUCCESS(rc))
1342	{
1343	# ifdef PGM_SYNC_N_PAGES
1344	Assert(cPages == 1 \|\| !(uErr & X86_TRAP_PF_P));
1345	if (cPages > 1 && !(uErr & X86_TRAP_PF_P))
1346	{
1347	/*
1348	* This code path is currently only taken when the caller is PGMTrap0eHandler
1349	* for non-present pages!
1350	*
1351	* We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and
1352	* deal with locality.
1353	*/
1354	unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1355	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1356	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
1357	const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512;
1358	# else
1359	const unsigned offPTSrc = 0;
1360	# endif
1361	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a));
1362	if (iPTDst < PGM_SYNC_NR_PAGES / 2)
1363	iPTDst = 0;
1364	else
1365	iPTDst -= PGM_SYNC_NR_PAGES / 2;
1366	for (; iPTDst < iPTDstEnd; iPTDst++)
1367	{
1368	if (!pPTDst->a[iPTDst].n.u1Present)
1369	{
1370	GSTPTE PteSrc = pPTSrc->a[offPTSrc + iPTDst];
1371	RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) \| ((offPTSrc + iPTDst) << PAGE_SHIFT);
1372	NOREF(GCPtrCurPage);
1373	#ifndef IN_RING0
1374	/*
1375	* Assuming kernel code will be marked as supervisor - and not as user level
1376	* and executed using a conforming code selector - And marked as readonly.
1377	* Also assume that if we're monitoring a page, it's of no interest to CSAM.
1378	*/
1379	PPGMPAGE pPage;
1380	if ( ((PdeSrc.u & PteSrc.u) & (X86_PTE_RW \| X86_PTE_US))
1381	\|\| iPTDst == ((GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK) /* always sync GCPtrPage */
1382	\|\| !CSAMDoesPageNeedScanning(pVM, (RTGCPTR)GCPtrCurPage)
1383	\|\| ( (pPage = pgmPhysGetPage(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK))
1384	&& PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage))
1385	)
1386	#endif /* else: CSAM not active */
1387	PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
1388	Log2(("SyncPage: 4K+ %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx%s\n",
1389	GCPtrCurPage, PteSrc.n.u1Present,
1390	PteSrc.n.u1Write & PdeSrc.n.u1Write,
1391	PteSrc.n.u1User & PdeSrc.n.u1User,
1392	(uint64_t)PteSrc.u,
1393	(uint64_t)pPTDst->a[iPTDst].u,
1394	pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
1395	}
1396	}
1397	}
1398	else
1399	# endif /* PGM_SYNC_N_PAGES */
1400	{
1401	const unsigned iPTSrc = (GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK;
1402	GSTPTE PteSrc = pPTSrc->a[iPTSrc];
1403	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1404	PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
1405	Log2(("SyncPage: 4K %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s\n",
1406	GCPtrPage, PteSrc.n.u1Present,
1407	PteSrc.n.u1Write & PdeSrc.n.u1Write,
1408	PteSrc.n.u1User & PdeSrc.n.u1User,
1409	(uint64_t)PteSrc.u,
1410	pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
1411	}
1412	}
1413	else /* MMIO or invalid page: emulated in #PF handler. */
1414	{
1415	LogFlow(("PGM_GCPHYS_2_PTR %VGp failed with %Vrc\n", GCPhys, rc));
1416	Assert(!pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK].n.u1Present);
1417	}
1418	}
1419	else
1420	{
1421	/*
1422	* 4/2MB page - lazy syncing shadow 4K pages.
1423	* (There are many causes of getting here, it's no longer only CSAM.)
1424	*/
1425	/* Calculate the GC physical address of this 4KB shadow page. */
1426	RTGCPHYS GCPhys = (PdeSrc.u & GST_PDE_BIG_PG_MASK) \| ((RTGCUINTPTR)GCPtrPage & GST_BIG_PAGE_OFFSET_MASK);
1427	/* Find ram range. */
1428	PPGMPAGE pPage;
1429	int rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage);
1430	if (VBOX_SUCCESS(rc))
1431	{
1432	/*
1433	* Make shadow PTE entry.
1434	*/
1435	const RTHCPHYS HCPhys = pPage->HCPhys; /** @todo PAGE FLAGS */
1436	SHWPTE PteDst;
1437	PteDst.u = (PdeSrc.u & ~(X86_PTE_PAE_PG_MASK \| X86_PTE_AVL_MASK \| X86_PTE_PAT \| X86_PTE_PCD \| X86_PTE_PWT))
1438	\| (HCPhys & X86_PTE_PAE_PG_MASK);
1439	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage))
1440	{
1441	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
1442	PteDst.n.u1Write = 0;
1443	else
1444	PteDst.u = 0;
1445	}
1446	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1447	# ifdef PGMPOOL_WITH_USER_TRACKING
1448	if (PteDst.n.u1Present && !pPTDst->a[iPTDst].n.u1Present)
1449	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst);
1450	# endif
1451	pPTDst->a[iPTDst] = PteDst;
1452
1453
1454	# ifdef PGM_SYNC_DIRTY_BIT
1455	/*
1456	* If the page is not flagged as dirty and is writable, then make it read-only
1457	* at PD level, so we can set the dirty bit when the page is modified.
1458	*
1459	* ASSUMES that page access handlers are implemented on page table entry level.
1460	* Thus we will first catch the dirty access and set PDE.D and restart. If
1461	* there is an access handler, we'll trap again and let it work on the problem.
1462	*/
1463	/** @todo r=bird: figure out why we need this here, SyncPT should've taken care of this already.
1464	* As for invlpg, it simply frees the whole shadow PT.
1465	* ...It's possibly because the guest clears it and the guest doesn't really tell us... */
1466	if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write)
1467	{
1468	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig));
1469	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
1470	PdeDst.n.u1Write = 0;
1471	}
1472	else
1473	{
1474	PdeDst.au32[0] &= ~PGM_PDFLAGS_TRACK_DIRTY;
1475	PdeDst.n.u1Write = PdeSrc.n.u1Write;
1476	}
1477	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1478	pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst] = PdeDst;
1479	# else /* PAE */
1480	pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst] = PdeDst;
1481	# endif
1482	# endif /* PGM_SYNC_DIRTY_BIT */
1483	Log2(("SyncPage: BIG %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} GCPhys=%VGp%s\n",
1484	GCPtrPage, PdeSrc.n.u1Present, PdeSrc.n.u1Write, PdeSrc.n.u1User, (uint64_t)PdeSrc.u, GCPhys,
1485	PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
1486	}
1487	else
1488	LogFlow(("PGM_GCPHYS_2_PTR %VGp (big) failed with %Vrc\n", GCPhys, rc));
1489	}
1490	return VINF_SUCCESS;
1491	}
1492	# ifdef PGM_SYNC_ACCESSED_BIT
1493	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPagePDNAs));
1494	#endif
1495	}
1496	else
1497	{
1498	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPagePDOutOfSync));
1499	Log2(("SyncPage: Out-Of-Sync PDE at %VGp PdeSrc=%RX64 PdeDst=%RX64\n",
1500	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
1501	}
1502
1503	/*
1504	* Mark the PDE not present. Restart the instruction and let #PF call SyncPT.
1505	* Yea, I'm lazy.
1506	*/
1507	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, SHW_POOL_ROOT_IDX, iPDDst);
1508	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1509	pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst].u = 0;
1510	# else /* PAE */
1511	pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst].u = 0;
1512	# endif
1513	PGM_INVL_GUEST_TLBS();
1514	return VINF_PGM_SYNCPAGE_MODIFIED_PDE;
1515
1516	#elif PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT
1517
1518	# ifdef PGM_SYNC_N_PAGES
1519	/*
1520	* Get the shadow PDE, find the shadow page table in the pool.
1521	*/
1522	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
1523	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1524	X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[iPDDst];
1525	# else /* PAE */
1526	X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[iPDDst];
1527	# endif
1528	Assert(PdeDst.n.u1Present);
1529	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, PdeDst.u & SHW_PDE_PG_MASK);
1530	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
1531
1532	# if PGM_SHW_TYPE == PGM_TYPE_PAE
1533	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
1534	const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512;
1535	# else
1536	const unsigned offPTSrc = 0;
1537	# endif
1538
1539	Assert(cPages == 1 \|\| !(uErr & X86_TRAP_PF_P));
1540	if (cPages > 1 && !(uErr & X86_TRAP_PF_P))
1541	{
1542	/*
1543	* This code path is currently only taken when the caller is PGMTrap0eHandler
1544	* for non-present pages!
1545	*
1546	* We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and
1547	* deal with locality.
1548	*/
1549	unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1550	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a));
1551	if (iPTDst < PGM_SYNC_NR_PAGES / 2)
1552	iPTDst = 0;
1553	else
1554	iPTDst -= PGM_SYNC_NR_PAGES / 2;
1555	for (; iPTDst < iPTDstEnd; iPTDst++)
1556	{
1557	if (!pPTDst->a[iPTDst].n.u1Present)
1558	{
1559	GSTPTE PteSrc;
1560
1561	RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) \| ((offPTSrc + iPTDst) << PAGE_SHIFT);
1562
1563	/* Fake the page table entry */
1564	PteSrc.u = GCPtrCurPage;
1565	PteSrc.n.u1Present = 1;
1566	PteSrc.n.u1Dirty = 1;
1567	PteSrc.n.u1Accessed = 1;
1568	PteSrc.n.u1Write = 1;
1569	PteSrc.n.u1User = 1;
1570
1571	PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
1572
1573	Log2(("SyncPage: 4K+ %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx%s\n",
1574	GCPtrCurPage, PteSrc.n.u1Present,
1575	PteSrc.n.u1Write & PdeSrc.n.u1Write,
1576	PteSrc.n.u1User & PdeSrc.n.u1User,
1577	(uint64_t)PteSrc.u,
1578	(uint64_t)pPTDst->a[iPTDst].u,
1579	pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
1580	}
1581	}
1582	}
1583	else
1584	# endif /* PGM_SYNC_N_PAGES */
1585	{
1586	GSTPTE PteSrc;
1587	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1588	RTGCUINTPTR GCPtrCurPage = ((RTGCUINTPTR)GCPtrPage & ~(RTGCUINTPTR)(GST_PT_MASK << GST_PT_SHIFT)) \| ((offPTSrc + iPTDst) << PAGE_SHIFT);
1589
1590	/* Fake the page table entry */
1591	PteSrc.u = GCPtrCurPage;
1592	PteSrc.n.u1Present = 1;
1593	PteSrc.n.u1Dirty = 1;
1594	PteSrc.n.u1Accessed = 1;
1595	PteSrc.n.u1Write = 1;
1596	PteSrc.n.u1User = 1;
1597	PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
1598
1599	Log2(("SyncPage: 4K %VGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s\n",
1600	GCPtrPage, PteSrc.n.u1Present,
1601	PteSrc.n.u1Write & PdeSrc.n.u1Write,
1602	PteSrc.n.u1User & PdeSrc.n.u1User,
1603	(uint64_t)PteSrc.u,
1604	pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
1605	}
1606	return VINF_SUCCESS;
1607
1608	#else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
1609	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
1610	return VERR_INTERNAL_ERROR;
1611	#endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
1612	}
1613
1614
1615
1616	#if PGM_WITH_PAGING(PGM_GST_TYPE)
1617
1618	# ifdef PGM_SYNC_DIRTY_BIT
1619
1620	/**
1621	* Investigate page fault and handle write protection page faults caused by
1622	* dirty bit tracking.
1623	*
1624	* @returns VBox status code.
1625	* @param pVM VM handle.
1626	* @param uErr Page fault error code.
1627	* @param pPdeDst Shadow page directory entry.
1628	* @param pPdeSrc Guest page directory entry.
1629	* @param GCPtrPage Guest context page address.
1630	*/
1631	PGM_BTH_DECL(int, CheckPageFault)(PVM pVM, uint32_t uErr, PSHWPDE pPdeDst, PGSTPDE pPdeSrc, RTGCUINTPTR GCPtrPage)
1632	{
1633	bool fWriteProtect = !!(CPUMGetGuestCR0(pVM) & X86_CR0_WP);
1634	bool fUserLevelFault = !!(uErr & X86_TRAP_PF_US);
1635	bool fWriteFault = !!(uErr & X86_TRAP_PF_RW);
1636	# if PGM_WITH_NX(PGM_GST_TYPE)
1637	bool fNoExecuteBitValid = !!(CPUMGetGuestEFER(pVM) & MSR_K6_EFER_NXE);
1638	# endif
1639
1640	STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a);
1641	LogFlow(("CheckPageFault: GCPtrPage=%VGv uErr=%#x PdeSrc=%08x\n", GCPtrPage, uErr, pPdeSrc->u));
1642
1643	# if PGM_GST_TYPE == PGM_TYPE_AMD64
1644	AssertFailed();
1645	# elif PGM_GST_TYPE == PGM_TYPE_PAE
1646	PX86PDPE pPdpeSrc = &pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[(GCPtrPage >> GST_PDPT_SHIFT) & GST_PDPT_MASK];
1647
1648	/*
1649	* Real page fault?
1650	*/
1651	if ( (uErr & X86_TRAP_PF_RSVD)
1652	\|\| !pPdpeSrc->n.u1Present
1653	# if PGM_GST_TYPE == PGM_TYPE_AMD64 /* NX, r/w, u/s bits in the PDPE are long mode only */
1654	\|\| (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && pPdpeSrc->n.u1NoExecute)
1655	\|\| (fWriteFault && !pPdpeSrc->n.u1Write && (fUserLevelFault \|\| fWriteProtect))
1656	\|\| (fUserLevelFault && !pPdpeSrc->n.u1User)
1657	# endif
1658	)
1659	{
1660	# ifdef IN_GC
1661	STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF);
1662	# endif
1663	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a);
1664	LogFlow(("CheckPageFault: real page fault at %VGv (0)\n", GCPtrPage));
1665
1666	if ( pPdpeSrc->n.u1Present
1667	&& pPdeSrc->n.u1Present)
1668	{
1669	/* Check the present bit as the shadow tables can cause different error codes by being out of sync.
1670	* See the 2nd case below as well.
1671	*/
1672	if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE))
1673	{
1674	TRPMSetErrorCode(pVM, uErr \| X86_TRAP_PF_P); /* page-level protection violation */
1675	}
1676	else
1677	{
1678	/*
1679	* Map the guest page table.
1680	*/
1681	PGSTPT pPTSrc;
1682	int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc);
1683	if (VBOX_SUCCESS(rc))
1684	{
1685	PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK];
1686	const GSTPTE PteSrc = *pPteSrc;
1687	if (pPteSrc->n.u1Present)
1688	TRPMSetErrorCode(pVM, uErr \| X86_TRAP_PF_P); /* page-level protection violation */
1689	}
1690	AssertRC(rc);
1691	}
1692	}
1693	return VINF_EM_RAW_GUEST_TRAP;
1694	}
1695	# endif
1696
1697	/*
1698	* Real page fault?
1699	*/
1700	if ( (uErr & X86_TRAP_PF_RSVD)
1701	\|\| !pPdeSrc->n.u1Present
1702	# if PGM_WITH_NX(PGM_GST_TYPE)
1703	\|\| (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && pPdeSrc->n.u1NoExecute)
1704	# endif
1705	\|\| (fWriteFault && !pPdeSrc->n.u1Write && (fUserLevelFault \|\| fWriteProtect))
1706	\|\| (fUserLevelFault && !pPdeSrc->n.u1User) )
1707	{
1708	# ifdef IN_GC
1709	STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF);
1710	# endif
1711	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat, DirtyBitTracking), a);
1712	LogFlow(("CheckPageFault: real page fault at %VGv (1)\n", GCPtrPage));
1713
1714	if (pPdeSrc->n.u1Present)
1715	{
1716	/* Check the present bit as the shadow tables can cause different error codes by being out of sync.
1717	* See the 2nd case below as well.
1718	*/
1719	if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE))
1720	{
1721	TRPMSetErrorCode(pVM, uErr \| X86_TRAP_PF_P); /* page-level protection violation */
1722	}
1723	else
1724	{
1725	/*
1726	* Map the guest page table.
1727	*/
1728	PGSTPT pPTSrc;
1729	int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc);
1730	if (VBOX_SUCCESS(rc))
1731	{
1732	PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK];
1733	const GSTPTE PteSrc = *pPteSrc;
1734	if (pPteSrc->n.u1Present)
1735	TRPMSetErrorCode(pVM, uErr \| X86_TRAP_PF_P); /* page-level protection violation */
1736	}
1737	AssertRC(rc);
1738	}
1739	}
1740	return VINF_EM_RAW_GUEST_TRAP;
1741	}
1742
1743	/*
1744	* First check the easy case where the page directory has been marked read-only to track
1745	* the dirty bit of an emulated BIG page
1746	*/
1747	if (pPdeSrc->b.u1Size && (CPUMGetGuestCR4(pVM) & X86_CR4_PSE))
1748	{
1749	/* Mark guest page directory as accessed */
1750	pPdeSrc->b.u1Accessed = 1;
1751
1752	/*
1753	* Only write protection page faults are relevant here.
1754	*/
1755	if (fWriteFault)
1756	{
1757	/* Mark guest page directory as dirty (BIG page only). */
1758	pPdeSrc->b.u1Dirty = 1;
1759
1760	if (pPdeDst->n.u1Present && (pPdeDst->u & PGM_PDFLAGS_TRACK_DIRTY))
1761	{
1762	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageTrap));
1763
1764	Assert(pPdeSrc->b.u1Write);
1765
1766	pPdeDst->n.u1Write = 1;
1767	pPdeDst->n.u1Accessed = 1;
1768	pPdeDst->au32[0] &= ~PGM_PDFLAGS_TRACK_DIRTY;
1769	PGM_INVL_BIG_PG(GCPtrPage);
1770	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1771	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT;
1772	}
1773	}
1774	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1775	return VINF_PGM_NO_DIRTY_BIT_TRACKING;
1776	}
1777	/* else: 4KB page table */
1778
1779	/*
1780	* Map the guest page table.
1781	*/
1782	PGSTPT pPTSrc;
1783	int rc = PGM_GCPHYS_2_PTR(pVM, pPdeSrc->u & GST_PDE_PG_MASK, &pPTSrc);
1784	if (VBOX_SUCCESS(rc))
1785	{
1786	/*
1787	* Real page fault?
1788	*/
1789	PGSTPTE pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK];
1790	const GSTPTE PteSrc = *pPteSrc;
1791	if ( !PteSrc.n.u1Present
1792	# if PGM_WITH_NX(PGM_GST_TYPE)
1793	\|\| (fNoExecuteBitValid && (uErr & X86_TRAP_PF_ID) && PteSrc.n.u1NoExecute)
1794	# endif
1795	\|\| (fWriteFault && !PteSrc.n.u1Write && (fUserLevelFault \|\| fWriteProtect))
1796	\|\| (fUserLevelFault && !PteSrc.n.u1User)
1797	)
1798	{
1799	# ifdef IN_GC
1800	STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtyTrackRealPF);
1801	# endif
1802	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1803	LogFlow(("CheckPageFault: real page fault at %VGv PteSrc.u=%08x (2)\n", GCPtrPage, PteSrc.u));
1804
1805	/* Check the present bit as the shadow tables can cause different error codes by being out of sync.
1806	* See the 2nd case above as well.
1807	*/
1808	if (pPdeSrc->n.u1Present && pPteSrc->n.u1Present)
1809	TRPMSetErrorCode(pVM, uErr \| X86_TRAP_PF_P); /* page-level protection violation */
1810
1811	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1812	return VINF_EM_RAW_GUEST_TRAP;
1813	}
1814	LogFlow(("CheckPageFault: page fault at %VGv PteSrc.u=%08x\n", GCPtrPage, PteSrc.u));
1815
1816	/*
1817	* Set the accessed bits in the page directory and the page table.
1818	*/
1819	pPdeSrc->n.u1Accessed = 1;
1820	pPteSrc->n.u1Accessed = 1;
1821
1822	/*
1823	* Only write protection page faults are relevant here.
1824	*/
1825	if (fWriteFault)
1826	{
1827	/* Write access, so mark guest entry as dirty. */
1828	# if defined(IN_GC) && defined(VBOX_WITH_STATISTICS)
1829	if (!pPteSrc->n.u1Dirty)
1830	STAM_COUNTER_INC(&pVM->pgm.s.StatGCDirtiedPage);
1831	else
1832	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageAlreadyDirty);
1833	# endif
1834	pPteSrc->n.u1Dirty = 1;
1835
1836	if (pPdeDst->n.u1Present)
1837	{
1838	/* Bail out here as pgmPoolGetPageByHCPhys will return NULL and we'll crash below.
1839	* Our individual shadow handlers will provide more information and force a fatal exit.
1840	*/
1841	if (MMHyperIsInsideArea(pVM, (RTGCPTR)GCPtrPage))
1842	{
1843	LogRel(("CheckPageFault: write to hypervisor region %VGv\n", GCPtrPage));
1844	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1845	return VINF_SUCCESS;
1846	}
1847
1848	/*
1849	* Map shadow page table.
1850	*/
1851	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, pPdeDst->u & SHW_PDE_PG_MASK);
1852	if (pShwPage)
1853	{
1854	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
1855	PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK];
1856	if ( pPteDst->n.u1Present /** @todo Optimize accessed bit emulation? */
1857	&& (pPteDst->u & PGM_PTFLAGS_TRACK_DIRTY))
1858	{
1859	LogFlow(("DIRTY page trap addr=%VGv\n", GCPtrPage));
1860	# ifdef VBOX_STRICT
1861	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, pPteSrc->u & GST_PTE_PG_MASK);
1862	if (pPage)
1863	AssertMsg(!PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage),
1864	("Unexpected dirty bit tracking on monitored page %VGv (phys %VGp)!!!!!!\n", GCPtrPage, pPteSrc->u & X86_PTE_PAE_PG_MASK));
1865	# endif
1866	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageTrap));
1867
1868	Assert(pPteSrc->n.u1Write);
1869
1870	pPteDst->n.u1Write = 1;
1871	pPteDst->n.u1Dirty = 1;
1872	pPteDst->n.u1Accessed = 1;
1873	pPteDst->au32[0] &= ~PGM_PTFLAGS_TRACK_DIRTY;
1874	PGM_INVL_PG(GCPtrPage);
1875
1876	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1877	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT;
1878	}
1879	}
1880	else
1881	AssertMsgFailed(("pgmPoolGetPageByHCPhys %VGp failed!\n", pPdeDst->u & SHW_PDE_PG_MASK));
1882	}
1883	}
1884	/** @todo Optimize accessed bit emulation? */
1885	# ifdef VBOX_STRICT
1886	/*
1887	* Sanity check.
1888	*/
1889	else if ( !pPteSrc->n.u1Dirty
1890	&& (pPdeSrc->n.u1Write & pPteSrc->n.u1Write)
1891	&& pPdeDst->n.u1Present)
1892	{
1893	PPGMPOOLPAGE pShwPage = pgmPoolGetPageByHCPhys(pVM, pPdeDst->u & SHW_PDE_PG_MASK);
1894	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
1895	PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK];
1896	if ( pPteDst->n.u1Present
1897	&& pPteDst->n.u1Write)
1898	LogFlow(("Writable present page %VGv not marked for dirty bit tracking!!!\n", GCPtrPage));
1899	}
1900	# endif /* VBOX_STRICT */
1901	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1902	return VINF_PGM_NO_DIRTY_BIT_TRACKING;
1903	}
1904	AssertRC(rc);
1905	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,DirtyBitTracking), a);
1906	return rc;
1907	}
1908
1909	# endif
1910
1911	#endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
1912
1913
1914	/**
1915	* Sync a shadow page table.
1916	*
1917	* The shadow page table is not present. This includes the case where
1918	* there is a conflict with a mapping.
1919	*
1920	* @returns VBox status code.
1921	* @param pVM VM handle.
1922	* @param iPD Page directory index.
1923	* @param pPDSrc Source page directory (i.e. Guest OS page directory).
1924	* Assume this is a temporary mapping.
1925	* @param GCPtrPage GC Pointer of the page that caused the fault
1926	*/
1927	PGM_BTH_DECL(int, SyncPT)(PVM pVM, unsigned iPDSrc, PGSTPD pPDSrc, RTGCUINTPTR GCPtrPage)
1928	{
1929	STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
1930	STAM_COUNTER_INC(&pVM->pgm.s.StatGCSyncPtPD[iPDSrc]);
1931	LogFlow(("SyncPT: GCPtrPage=%VGv\n", GCPtrPage));
1932
1933	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
1934	\|\| PGM_GST_TYPE == PGM_TYPE_PAE
1935
1936	/*
1937	* Validate input a little bit.
1938	*/
1939	AssertMsg(iPDSrc == ((GCPtrPage >> GST_PD_SHIFT) & GST_PD_MASK), ("iPDSrc=%x GCPtrPage=%VGv\n", iPDSrc, GCPtrPage));
1940	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1941	PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD);
1942	# else
1943	PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0];
1944	# endif
1945	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
1946	PSHWPDE pPdeDst = &pPDDst->a[iPDDst];
1947	SHWPDE PdeDst = *pPdeDst;
1948
1949	# if PGM_GST_TYPE == PGM_TYPE_32BIT
1950	/*
1951	* Check for conflicts.
1952	* GC: In case of a conflict we'll go to Ring-3 and do a full SyncCR3.
1953	* HC: Simply resolve the conflict.
1954	*/
1955	if (PdeDst.u & PGM_PDFLAGS_MAPPING)
1956	{
1957	Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
1958	# ifndef IN_RING3
1959	Log(("SyncPT: Conflict at %VGv\n", GCPtrPage));
1960	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
1961	return VERR_ADDRESS_CONFLICT;
1962	# else
1963	PPGMMAPPING pMapping = pgmGetMapping(pVM, (RTGCPTR)GCPtrPage);
1964	Assert(pMapping);
1965	int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, iPDSrc);
1966	if (VBOX_FAILURE(rc))
1967	{
1968	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
1969	return rc;
1970	}
1971	PdeDst = *pPdeDst;
1972	# endif
1973	}
1974	# else /* PGM_GST_TYPE == PGM_TYPE_32BIT */
1975	/* PAE and AMD64 modes are hardware accelerated only, so there are no mappings. */
1976	Assert(!pgmMapAreMappingsEnabled(&pVM->pgm.s));
1977	# endif /* PGM_GST_TYPE == PGM_TYPE_32BIT */
1978	Assert(!PdeDst.n.u1Present); /* We're only supposed to call SyncPT on PDE!P and conflicts.*/
1979
1980	/*
1981	* Sync page directory entry.
1982	*/
1983	int rc = VINF_SUCCESS;
1984	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
1985	if (PdeSrc.n.u1Present)
1986	{
1987	/*
1988	* Allocate & map the page table.
1989	*/
1990	PSHWPT pPTDst;
1991	const bool fPageTable = !PdeSrc.b.u1Size \|\| !(CPUMGetGuestCR4(pVM) & X86_CR4_PSE);
1992	PPGMPOOLPAGE pShwPage;
1993	RTGCPHYS GCPhys;
1994	if (fPageTable)
1995	{
1996	GCPhys = PdeSrc.u & GST_PDE_PG_MASK;
1997	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1998	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
1999	GCPhys \|= (iPDDst & 1) * (PAGE_SIZE / 2);
2000	# endif
2001	rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_PT, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage);
2002	}
2003	else
2004	{
2005	GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK;
2006	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2007	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
2008	GCPhys \|= GCPtrPage & (1 << X86_PD_PAE_SHIFT);
2009	# endif
2010	rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_BIG, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage);
2011	}
2012	if (rc == VINF_SUCCESS)
2013	pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
2014	else if (rc == VINF_PGM_CACHED_PAGE)
2015	{
2016	/*
2017	* The PT was cached, just hook it up.
2018	*/
2019	if (fPageTable)
2020	PdeDst.u = pShwPage->Core.Key
2021	\| (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));
2022	else
2023	{
2024	PdeDst.u = pShwPage->Core.Key
2025	\| (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));
2026	# ifdef PGM_SYNC_DIRTY_BIT /* (see explanation and assumptions further down.) */
2027	if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write)
2028	{
2029	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig));
2030	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
2031	PdeDst.b.u1Write = 0;
2032	}
2033	# endif
2034	}
2035	*pPdeDst = PdeDst;
2036	return VINF_SUCCESS;
2037	}
2038	else if (rc == VERR_PGM_POOL_FLUSHED)
2039	return VINF_PGM_SYNC_CR3;
2040	else
2041	AssertMsgFailedReturn(("rc=%Vrc\n", rc), VERR_INTERNAL_ERROR);
2042	PdeDst.u &= X86_PDE_AVL_MASK;
2043	PdeDst.u \|= pShwPage->Core.Key;
2044
2045	# ifdef PGM_SYNC_DIRTY_BIT
2046	/*
2047	* Page directory has been accessed (this is a fault situation, remember).
2048	*/
2049	pPDSrc->a[iPDSrc].n.u1Accessed = 1;
2050	# endif
2051	if (fPageTable)
2052	{
2053	/*
2054	* Page table - 4KB.
2055	*
2056	* Sync all or just a few entries depending on PGM_SYNC_N_PAGES.
2057	*/
2058	Log2(("SyncPT: 4K %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx}\n",
2059	GCPtrPage, PdeSrc.b.u1Present, PdeSrc.b.u1Write, PdeSrc.b.u1User, (uint64_t)PdeSrc.u));
2060	PGSTPT pPTSrc;
2061	rc = PGM_GCPHYS_2_PTR(pVM, PdeSrc.u & GST_PDE_PG_MASK, &pPTSrc);
2062	if (VBOX_SUCCESS(rc))
2063	{
2064	/*
2065	* Start by syncing the page directory entry so CSAM's TLB trick works.
2066	*/
2067	PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK \| X86_PDE_AVL_MASK))
2068	\| (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));
2069	*pPdeDst = PdeDst;
2070
2071	/*
2072	* Directory/page user or supervisor privilege: (same goes for read/write)
2073	*
2074	* Directory Page Combined
2075	* U/S U/S U/S
2076	* 0 0 0
2077	* 0 1 0
2078	* 1 0 0
2079	* 1 1 1
2080	*
2081	* Simple AND operation. Table listed for completeness.
2082	*
2083	*/
2084	STAM_COUNTER_INC(CTXSUFF(&pVM->pgm.s.StatSynPT4k));
2085	# ifdef PGM_SYNC_N_PAGES
2086	unsigned iPTBase = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2087	unsigned iPTDst = iPTBase;
2088	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, ELEMENTS(pPTDst->a));
2089	if (iPTDst <= PGM_SYNC_NR_PAGES / 2)
2090	iPTDst = 0;
2091	else
2092	iPTDst -= PGM_SYNC_NR_PAGES / 2;
2093	# else /* !PGM_SYNC_N_PAGES */
2094	unsigned iPTDst = 0;
2095	const unsigned iPTDstEnd = ELEMENTS(pPTDst->a);
2096	# endif /* !PGM_SYNC_N_PAGES */
2097	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2098	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
2099	const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512;
2100	# else
2101	const unsigned offPTSrc = 0;
2102	# endif
2103	for (; iPTDst < iPTDstEnd; iPTDst++)
2104	{
2105	const unsigned iPTSrc = iPTDst + offPTSrc;
2106	const GSTPTE PteSrc = pPTSrc->a[iPTSrc];
2107
2108	if (PteSrc.n.u1Present) /* we've already cleared it above */
2109	{
2110	# ifndef IN_RING0
2111	/*
2112	* Assuming kernel code will be marked as supervisor - and not as user level
2113	* and executed using a conforming code selector - And marked as readonly.
2114	* Also assume that if we're monitoring a page, it's of no interest to CSAM.
2115	*/
2116	PPGMPAGE pPage;
2117	if ( ((PdeSrc.u & pPTSrc->a[iPTSrc].u) & (X86_PTE_RW \| X86_PTE_US))
2118	\|\| !CSAMDoesPageNeedScanning(pVM, (RTGCPTR)((iPDSrc << GST_PD_SHIFT) \| (iPTSrc << PAGE_SHIFT)))
2119	\|\| ( (pPage = pgmPhysGetPage(&pVM->pgm.s, PteSrc.u & GST_PTE_PG_MASK))
2120	&& PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage))
2121	)
2122	# endif
2123	PGM_BTH_NAME(SyncPageWorker)(pVM, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
2124	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",
2125	(RTGCPTR)((iPDSrc << GST_PD_SHIFT) \| (iPTSrc << PAGE_SHIFT)),
2126	PteSrc.n.u1Present,
2127	PteSrc.n.u1Write & PdeSrc.n.u1Write,
2128	PteSrc.n.u1User & PdeSrc.n.u1User,
2129	(uint64_t)PteSrc.u,
2130	pPTDst->a[iPTDst].u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : "", pPTDst->a[iPTDst].u, iPTSrc, PdeSrc.au32[0],
2131	(PdeSrc.u & GST_PDE_PG_MASK) + iPTSrc*sizeof(PteSrc)));
2132	}
2133	} /* for PTEs */
2134	}
2135	}
2136	else
2137	{
2138	/*
2139	* Big page - 2/4MB.
2140	*
2141	* We'll walk the ram range list in parallel and optimize lookups.
2142	* We will only sync on shadow page table at a time.
2143	*/
2144	STAM_COUNTER_INC(CTXSUFF(&pVM->pgm.s.StatSynPT4M));
2145
2146	/**
2147	* @todo It might be more efficient to sync only a part of the 4MB page (similar to what we do for 4kb PDs).
2148	*/
2149
2150	/*
2151	* Start by syncing the page directory entry.
2152	*/
2153	PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK \| (X86_PDE_AVL_MASK & ~PGM_PDFLAGS_TRACK_DIRTY)))
2154	\| (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));
2155
2156	# ifdef PGM_SYNC_DIRTY_BIT
2157	/*
2158	* If the page is not flagged as dirty and is writable, then make it read-only
2159	* at PD level, so we can set the dirty bit when the page is modified.
2160	*
2161	* ASSUMES that page access handlers are implemented on page table entry level.
2162	* Thus we will first catch the dirty access and set PDE.D and restart. If
2163	* there is an access handler, we'll trap again and let it work on the problem.
2164	*/
2165	/** @todo move the above stuff to a section in the PGM documentation. */
2166	Assert(!(PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY));
2167	if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write)
2168	{
2169	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,DirtyPageBig));
2170	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
2171	PdeDst.b.u1Write = 0;
2172	}
2173	# endif /* PGM_SYNC_DIRTY_BIT */
2174	*pPdeDst = PdeDst;
2175
2176	/*
2177	* Fill the shadow page table.
2178	*/
2179	/* Get address and flags from the source PDE. */
2180	SHWPTE PteDstBase;
2181	PteDstBase.u = PdeSrc.u & ~(GST_PDE_PG_MASK \| X86_PTE_AVL_MASK \| X86_PTE_PAT \| X86_PTE_PCD \| X86_PTE_PWT);
2182
2183	/* Loop thru the entries in the shadow PT. */
2184	const RTGCUINTPTR GCPtr = (GCPtrPage >> SHW_PD_SHIFT) << SHW_PD_SHIFT; NOREF(GCPtr);
2185	Log2(("SyncPT: BIG %VGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} Shw=%VGv GCPhys=%VGp %s\n",
2186	GCPtrPage, PdeSrc.b.u1Present, PdeSrc.b.u1Write, PdeSrc.b.u1User, (uint64_t)PdeSrc.u, GCPtr,
2187	GCPhys, PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
2188	PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
2189	unsigned iPTDst = 0;
2190	while (iPTDst < ELEMENTS(pPTDst->a))
2191	{
2192	/* Advance ram range list. */
2193	while (pRam && GCPhys > pRam->GCPhysLast)
2194	pRam = CTXALLSUFF(pRam->pNext);
2195	if (pRam && GCPhys >= pRam->GCPhys)
2196	{
2197	unsigned iHCPage = (GCPhys - pRam->GCPhys) >> PAGE_SHIFT;
2198	do
2199	{
2200	/* Make shadow PTE. */
2201	PPGMPAGE pPage = &pRam->aPages[iHCPage];
2202	SHWPTE PteDst;
2203
2204	/* Make sure the RAM has already been allocated. */
2205	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC) /** @todo PAGE FLAGS */
2206	{
2207	if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage)))
2208	{
2209	# ifdef IN_RING3
2210	int rc = pgmr3PhysGrowRange(pVM, GCPhys);
2211	# else
2212	int rc = CTXALLMID(VMM, CallHost)(pVM, VMMCALLHOST_PGM_RAM_GROW_RANGE, GCPhys);
2213	# endif
2214	if (rc != VINF_SUCCESS)
2215	return rc;
2216	}
2217	}
2218
2219	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage))
2220	{
2221	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
2222	{
2223	PteDst.u = PGM_PAGE_GET_HCPHYS(pPage) \| PteDstBase.u;
2224	PteDst.n.u1Write = 0;
2225	}
2226	else
2227	PteDst.u = 0;
2228	}
2229	# ifndef IN_RING0
2230	/*
2231	* Assuming kernel code will be marked as supervisor and not as user level and executed
2232	* using a conforming code selector. Don't check for readonly, as that implies the whole
2233	* 4MB can be code or readonly data. Linux enables write access for its large pages.
2234	*/
2235	else if ( !PdeSrc.n.u1User
2236	&& CSAMDoesPageNeedScanning(pVM, (RTGCPTR)(GCPtr \| (iPTDst << SHW_PT_SHIFT))))
2237	PteDst.u = 0;
2238	# endif
2239	else
2240	PteDst.u = PGM_PAGE_GET_HCPHYS(pPage) \| PteDstBase.u;
2241	# ifdef PGMPOOL_WITH_USER_TRACKING
2242	if (PteDst.n.u1Present)
2243	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVM, pShwPage, pPage->HCPhys >> MM_RAM_FLAGS_IDX_SHIFT, pPage, iPTDst); /** @todo PAGE FLAGS */
2244	# endif
2245	/* commit it */
2246	pPTDst->a[iPTDst] = PteDst;
2247	Log4(("SyncPT: BIG %VGv PteDst:{P=%d RW=%d U=%d raw=%08llx}%s\n",
2248	(RTGCPTR)(GCPtr \| (iPTDst << SHW_PT_SHIFT)), PteDst.n.u1Present, PteDst.n.u1Write, PteDst.n.u1User, (uint64_t)PteDst.u,
2249	PteDst.u & PGM_PTFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
2250
2251	/* advance */
2252	GCPhys += PAGE_SIZE;
2253	iHCPage++;
2254	iPTDst++;
2255	} while ( iPTDst < ELEMENTS(pPTDst->a)
2256	&& GCPhys <= pRam->GCPhysLast);
2257	}
2258	else if (pRam)
2259	{
2260	Log(("Invalid pages at %VGp\n", GCPhys));
2261	do
2262	{
2263	pPTDst->a[iPTDst].u = 0; /* MMIO or invalid page, we must handle them manually. */
2264	GCPhys += PAGE_SIZE;
2265	iPTDst++;
2266	} while ( iPTDst < ELEMENTS(pPTDst->a)
2267	&& GCPhys < pRam->GCPhys);
2268	}
2269	else
2270	{
2271	Log(("Invalid pages at %VGp (2)\n", GCPhys));
2272	for ( ; iPTDst < ELEMENTS(pPTDst->a); iPTDst++)
2273	pPTDst->a[iPTDst].u = 0; /* MMIO or invalid page, we must handle them manually. */
2274	}
2275	} /* while more PTEs */
2276	} /* 4KB / 4MB */
2277	}
2278	else
2279	AssertRelease(!PdeDst.n.u1Present);
2280
2281	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
2282	# ifdef IN_GC
2283	if (VBOX_FAILURE(rc))
2284	STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncPTFailed));
2285	# endif
2286	return rc;
2287
2288	#elif PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT
2289
2290	int rc = VINF_SUCCESS;
2291
2292	/*
2293	* Validate input a little bit.
2294	*/
2295	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2296	PX86PD pPDDst = pVM->pgm.s.CTXMID(p,32BitPD);
2297	# else
2298	PX86PDPAE pPDDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0];
2299	# endif
2300	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
2301	PSHWPDE pPdeDst = &pPDDst->a[iPDDst];
2302	SHWPDE PdeDst = *pPdeDst;
2303
2304	Assert(!(PdeDst.u & PGM_PDFLAGS_MAPPING));
2305	Assert(!PdeDst.n.u1Present); /* We're only supposed to call SyncPT on PDE!P and conflicts.*/
2306
2307	GSTPDE PdeSrc;
2308	PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */
2309	PdeSrc.n.u1Present = 1;
2310	PdeSrc.n.u1Write = 1;
2311	PdeSrc.n.u1Accessed = 1;
2312	PdeSrc.n.u1User = 1;
2313
2314	/*
2315	* Allocate & map the page table.
2316	*/
2317	PSHWPT pPTDst;
2318	PPGMPOOLPAGE pShwPage;
2319	RTGCPHYS GCPhys;
2320
2321	/* Virtual address = physical address */
2322	GCPhys = GCPtrPage & X86_PAGE_4K_BASE_MASK_32;
2323	rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_PT, SHW_POOL_ROOT_IDX, iPDDst, &pShwPage);
2324
2325	if ( rc == VINF_SUCCESS
2326	\|\| rc == VINF_PGM_CACHED_PAGE)
2327	pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR(pVM, pShwPage);
2328	else
2329	AssertMsgFailedReturn(("rc=%Vrc\n", rc), VERR_INTERNAL_ERROR);
2330
2331	PdeDst.u &= X86_PDE_AVL_MASK;
2332	PdeDst.u \|= pShwPage->Core.Key;
2333	PdeDst.n.u1Present = 1;
2334	*pPdeDst = PdeDst;
2335
2336	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, (RTGCUINTPTR)GCPtrPage, PGM_SYNC_NR_PAGES, 0 /* page not present */);
2337	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
2338	return rc;
2339
2340	#else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
2341	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
2342	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncPT), a);
2343	return VERR_INTERNAL_ERROR;
2344	#endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
2345	}
2346
2347
2348
2349	/**
2350	* Prefetch a page/set of pages.
2351	*
2352	* Typically used to sync commonly used pages before entering raw mode
2353	* after a CR3 reload.
2354	*
2355	* @returns VBox status code.
2356	* @param pVM VM handle.
2357	* @param GCPtrPage Page to invalidate.
2358	*/
2359	PGM_BTH_DECL(int, PrefetchPage)(PVM pVM, RTGCUINTPTR GCPtrPage)
2360	{
2361	#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
2362	/*
2363	* Check that all Guest levels thru the PDE are present, getting the
2364	* PD and PDE in the processes.
2365	*/
2366	int rc = VINF_SUCCESS;
2367	# if PGM_WITH_PAGING(PGM_GST_TYPE)
2368	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2369	const unsigned iPDSrc = (RTGCUINTPTR)GCPtrPage >> GST_PD_SHIFT;
2370	PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD);
2371	# else /* PAE */
2372	unsigned iPDSrc;
2373	PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc);
2374	if (!pPDSrc)
2375	return VINF_SUCCESS; /* not present */
2376	# endif
2377	const GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
2378	# else
2379	PGSTPD pPDSrc = NULL;
2380	const unsigned iPDSrc = 0;
2381	GSTPDE PdeSrc;
2382
2383	PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */
2384	PdeSrc.n.u1Present = 1;
2385	PdeSrc.n.u1Write = 1;
2386	PdeSrc.n.u1Accessed = 1;
2387	PdeSrc.n.u1User = 1;
2388	# endif
2389
2390	# ifdef PGM_SYNC_ACCESSED_BIT
2391	if (PdeSrc.n.u1Present && PdeSrc.n.u1Accessed)
2392	# else
2393	if (PdeSrc.n.u1Present)
2394	# endif
2395	{
2396	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2397	const X86PDE PdeDst = pVM->pgm.s.CTXMID(p,32BitPD)->a[GCPtrPage >> SHW_PD_SHIFT];
2398	# else
2399	const X86PDEPAE PdeDst = pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[GCPtrPage >> SHW_PD_SHIFT];
2400	# endif
2401	if (!(PdeDst.u & PGM_PDFLAGS_MAPPING))
2402	{
2403	if (!PdeDst.n.u1Present)
2404	/** r=bird: This guy will set the A bit on the PDE, probably harmless. */
2405	rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage);
2406	else
2407	{
2408	/** @note We used to sync PGM_SYNC_NR_PAGES pages, which triggered assertions in CSAM, because
2409	* R/W attributes of nearby pages were reset. Not sure how that could happen. Anyway, it
2410	* makes no sense to prefetch more than one page.
2411	*/
2412	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0);
2413	if (VBOX_SUCCESS(rc))
2414	rc = VINF_SUCCESS;
2415	}
2416	}
2417	}
2418	return rc;
2419
2420	#else /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
2421
2422	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE));
2423	return VERR_INTERNAL_ERROR;
2424	#endif /* PGM_GST_TYPE == PGM_TYPE_AMD64 */
2425	}
2426
2427
2428
2429
2430	/**
2431	* Syncs a page during a PGMVerifyAccess() call.
2432	*
2433	* @returns VBox status code (informational included).
2434	* @param GCPtrPage The address of the page to sync.
2435	* @param fPage The effective guest page flags.
2436	* @param uErr The trap error code.
2437	*/
2438	PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVM pVM, RTGCUINTPTR GCPtrPage, unsigned fPage, unsigned uErr)
2439	{
2440	LogFlow(("VerifyAccessSyncPage: GCPtrPage=%VGv fPage=%#x uErr=%#x\n", GCPtrPage, fPage, uErr));
2441
2442	#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
2443
2444	# ifndef IN_RING0
2445	if (!(fPage & X86_PTE_US))
2446	{
2447	/*
2448	* Mark this page as safe.
2449	*/
2450	/** @todo not correct for pages that contain both code and data!! */
2451	Log(("CSAMMarkPage %VGv; scanned=%d\n", GCPtrPage, true));
2452	CSAMMarkPage(pVM, (RTGCPTR)GCPtrPage, true);
2453	}
2454	# endif
2455	/*
2456	* Get guest PD and index.
2457	*/
2458
2459	# if PGM_WITH_PAGING(PGM_GST_TYPE)
2460	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2461	const unsigned iPDSrc = (RTGCUINTPTR)GCPtrPage >> GST_PD_SHIFT;
2462	PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD);
2463	# else /* PAE */
2464	unsigned iPDSrc;
2465	PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, GCPtrPage, &iPDSrc);
2466	# endif
2467	# else
2468	PGSTPD pPDSrc = NULL;
2469	const unsigned iPDSrc = 0;
2470	# endif
2471	int rc = VINF_SUCCESS;
2472
2473	/*
2474	* First check if the shadow pd is present.
2475	*/
2476	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2477	PX86PDE pPdeDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[GCPtrPage >> SHW_PD_SHIFT];
2478	# else
2479	PX86PDEPAE pPdeDst = &pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[GCPtrPage >> SHW_PD_SHIFT];
2480	# endif
2481	if (!pPdeDst->n.u1Present)
2482	{
2483	rc = PGM_BTH_NAME(SyncPT)(pVM, iPDSrc, pPDSrc, GCPtrPage);
2484	AssertRC(rc);
2485	if (rc != VINF_SUCCESS)
2486	return rc;
2487	}
2488
2489	# if PGM_WITH_PAGING(PGM_GST_TYPE)
2490	/* Check for dirty bit fault */
2491	rc = PGM_BTH_NAME(CheckPageFault)(pVM, uErr, pPdeDst, &pPDSrc->a[iPDSrc], GCPtrPage);
2492	if (rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT)
2493	Log(("PGMVerifyAccess: success (dirty)\n"));
2494	else
2495	{
2496	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
2497	#else
2498	{
2499	GSTPDE PdeSrc;
2500	PdeSrc.au32[0] = 0; /* faked so we don't have to #ifdef everything */
2501	PdeSrc.n.u1Present = 1;
2502	PdeSrc.n.u1Write = 1;
2503	PdeSrc.n.u1Accessed = 1;
2504	PdeSrc.n.u1User = 1;
2505
2506	#endif /* PGM_WITH_PAGING(PGM_GST_TYPE) */
2507	Assert(rc != VINF_EM_RAW_GUEST_TRAP);
2508	if (uErr & X86_TRAP_PF_US)
2509	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncUser);
2510	else /* supervisor */
2511	STAM_COUNTER_INC(&pVM->pgm.s.StatGCPageOutOfSyncSupervisor);
2512
2513	rc = PGM_BTH_NAME(SyncPage)(pVM, PdeSrc, GCPtrPage, 1, 0);
2514	if (VBOX_SUCCESS(rc))
2515	{
2516	/* Page was successfully synced */
2517	Log2(("PGMVerifyAccess: success (sync)\n"));
2518	rc = VINF_SUCCESS;
2519	}
2520	else
2521	{
2522	Log(("PGMVerifyAccess: access violation for %VGv rc=%d\n", GCPtrPage, rc));
2523	return VINF_EM_RAW_GUEST_TRAP;
2524	}
2525	}
2526	return rc;
2527
2528	#else /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2529
2530	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
2531	return VERR_INTERNAL_ERROR;
2532	#endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2533	}
2534
2535
2536	#if PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_PAE
2537	# if PGM_SHW_TYPE == PGM_TYPE_32BIT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE
2538	/**
2539	* Figures out which kind of shadow page this guest PDE warrants.
2540	*
2541	* @returns Shadow page kind.
2542	* @param pPdeSrc The guest PDE in question.
2543	* @param cr4 The current guest cr4 value.
2544	*/
2545	DECLINLINE(PGMPOOLKIND) PGM_BTH_NAME(CalcPageKind)(const GSTPDE *pPdeSrc, uint32_t cr4)
2546	{
2547	if (!pPdeSrc->n.u1Size \|\| !(cr4 & X86_CR4_PSE))
2548	return BTH_PGMPOOLKIND_PT_FOR_PT;
2549	//switch (pPdeSrc->u & (X86_PDE4M_RW \| X86_PDE4M_US /\| X86_PDE4M_PAE_NX/))
2550	//{
2551	// case 0:
2552	// return BTH_PGMPOOLKIND_PT_FOR_BIG_RO;
2553	// case X86_PDE4M_RW:
2554	// return BTH_PGMPOOLKIND_PT_FOR_BIG_RW;
2555	// case X86_PDE4M_US:
2556	// return BTH_PGMPOOLKIND_PT_FOR_BIG_US;
2557	// case X86_PDE4M_RW \| X86_PDE4M_US:
2558	// return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_US;
2559	# if 0
2560	// case X86_PDE4M_PAE_NX:
2561	// return BTH_PGMPOOLKIND_PT_FOR_BIG_NX;
2562	// case X86_PDE4M_RW \| X86_PDE4M_PAE_NX:
2563	// return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_NX;
2564	// case X86_PDE4M_US \| X86_PDE4M_PAE_NX:
2565	// return BTH_PGMPOOLKIND_PT_FOR_BIG_US_NX;
2566	// case X86_PDE4M_RW \| X86_PDE4M_US \| X86_PDE4M_PAE_NX:
2567	// return BTH_PGMPOOLKIND_PT_FOR_BIG_RW_US_NX;
2568	# endif
2569	return BTH_PGMPOOLKIND_PT_FOR_BIG;
2570	//}
2571	}
2572	# endif
2573	#endif
2574
2575	#undef MY_STAM_COUNTER_INC
2576	#define MY_STAM_COUNTER_INC(a) do { } while (0)
2577
2578
2579	/**
2580	* Syncs the paging hierarchy starting at CR3.
2581	*
2582	* @returns VBox status code, no specials.
2583	* @param pVM The virtual machine.
2584	* @param cr0 Guest context CR0 register
2585	* @param cr3 Guest context CR3 register
2586	* @param cr4 Guest context CR4 register
2587	* @param fGlobal Including global page directories or not
2588	*/
2589	PGM_BTH_DECL(int, SyncCR3)(PVM pVM, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal)
2590	{
2591	if (VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3))
2592	fGlobal = true; /* Change this CR3 reload to be a global one. */
2593
2594	/*
2595	* Update page access handlers.
2596	* The virtual are always flushed, while the physical are only on demand.
2597	* WARNING: We are incorrectly not doing global flushing on Virtual Handler updates. We'll
2598	* have to look into that later because it will have a bad influence on the performance.
2599	* @note SvL: There's no need for that. Just invalidate the virtual range(s).
2600	* bird: Yes, but that won't work for aliases.
2601	*/
2602	/** @todo this MUST go away. See #1557. */
2603	STAM_PROFILE_START(&pVM->pgm.s.CTXMID(Stat,SyncCR3Handlers), h);
2604	PGM_GST_NAME(HandlerVirtualUpdate)(pVM, cr4);
2605	STAM_PROFILE_STOP(&pVM->pgm.s.CTXMID(Stat,SyncCR3Handlers), h);
2606
2607	#ifdef PGMPOOL_WITH_MONITORING
2608	/*
2609	* When monitoring shadowed pages, we reset the modification counters on CR3 sync.
2610	* Occationally we will have to clear all the shadow page tables because we wanted
2611	* to monitor a page which was mapped by too many shadowed page tables. This operation
2612	* sometimes refered to as a 'lightweight flush'.
2613	*/
2614	if (!(pVM->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL))
2615	pgmPoolMonitorModifiedClearAll(pVM);
2616	else
2617	{
2618	# ifdef IN_RING3
2619	pVM->pgm.s.fSyncFlags &= ~PGM_SYNC_CLEAR_PGM_POOL;
2620	pgmPoolClearAll(pVM);
2621	# else
2622	LogFlow(("SyncCR3: PGM_SYNC_CLEAR_PGM_POOL is set -> VINF_PGM_SYNC_CR3\n"));
2623	return VINF_PGM_SYNC_CR3;
2624	# endif
2625	}
2626	#endif
2627
2628	Assert(fGlobal \|\| (cr4 & X86_CR4_PGE));
2629	MY_STAM_COUNTER_INC(fGlobal ? &pVM->pgm.s.CTXMID(Stat,SyncCR3Global) : &pVM->pgm.s.CTXMID(Stat,SyncCR3NotGlobal));
2630
2631	#if PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_PAE
2632	/*
2633	* Get page directory addresses.
2634	*/
2635	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2636	PX86PDE pPDEDst = &pVM->pgm.s.CTXMID(p,32BitPD)->a[0];
2637	# else
2638	PX86PDEPAE pPDEDst = &pVM->pgm.s.CTXMID(ap,PaePDs)[0]->a[0];
2639	# endif
2640
2641	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2642	PGSTPD pPDSrc = CTXSUFF(pVM->pgm.s.pGuestPD);
2643	Assert(pPDSrc);
2644	# ifndef IN_GC
2645	Assert(MMPhysGCPhys2HCVirt(pVM, (RTGCPHYS)(cr3 & GST_CR3_PAGE_MASK), sizeof(*pPDSrc)) == pPDSrc);
2646	# endif
2647	# endif
2648
2649	/*
2650	* Iterate the page directory.
2651	*/
2652	PPGMMAPPING pMapping;
2653	unsigned iPdNoMapping;
2654	const bool fRawR0Enabled = EMIsRawRing0Enabled(pVM);
2655	PPGMPOOL pPool = pVM->pgm.s.CTXSUFF(pPool);
2656
2657	/* Only check mappings if they are supposed to be put into the shadow page table. */
2658	if (pgmMapAreMappingsEnabled(&pVM->pgm.s))
2659	{
2660	pMapping = pVM->pgm.s.CTXALLSUFF(pMappings);
2661	iPdNoMapping = (pMapping) ? pMapping->GCPtr >> X86_PD_SHIFT : ~0U; /** PAE todo */
2662	}
2663	else
2664	{
2665	pMapping = 0;
2666	iPdNoMapping = ~0U;
2667	}
2668	# if PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64
2669	for (unsigned iPDPTE = 0; iPDPTE < GST_PDPE_ENTRIES; iPDPTE++)
2670	{
2671	unsigned iPDSrc;
2672	# if PGM_SHW_TYPE == PGM_TYPE_PAE
2673	PX86PDPAE pPDPAE = pVM->pgm.s.CTXMID(ap,PaePDs)[0];
2674	# else
2675	AssertFailed(); /* @todo */
2676	PX86PDPE pPDPAE = pVM->pgm.s.CTXMID(ap,PaePDs)[iPDPTE * X86_PG_AMD64_ENTRIES];
2677	# endif
2678	PX86PDEPAE pPDEDst = &pPDPAE->a[iPDPTE * X86_PG_PAE_ENTRIES];
2679	PGSTPD pPDSrc = pgmGstGetPaePDPtr(&pVM->pgm.s, iPDPTE << X86_PDPT_SHIFT, &iPDSrc);
2680
2681	if (pPDSrc == NULL)
2682	{
2683	/* PDPT not present */
2684	if (pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present)
2685	{
2686	for (unsigned iPD = 0; iPD < ELEMENTS(pPDSrc->a); iPD++)
2687	{
2688	if (pPDEDst[iPD].n.u1Present)
2689	{
2690	pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, pPDEDst[iPD].u & SHW_PDE_PG_MASK), SHW_POOL_ROOT_IDX, iPDPTE * X86_PG_PAE_ENTRIES + iPD);
2691	pPDEDst[iPD].u = 0;
2692	}
2693	}
2694	}
2695	pVM->pgm.s.CTXMID(p,PaePDPT)->a[iPDPTE].n.u1Present = 0;
2696	continue;
2697	}
2698	# else /* PGM_GST_TYPE != PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_AMD64 */
2699	{
2700	# endif /* PGM_GST_TYPE != PGM_TYPE_PAE && PGM_GST_TYPE != PGM_TYPE_AMD64 */
2701	for (unsigned iPD = 0; iPD < ELEMENTS(pPDSrc->a); iPD++)
2702	{
2703	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2704	Assert(&pVM->pgm.s.CTXMID(p,32BitPD)->a[iPD] == pPDEDst);
2705	# elif PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2706	Assert(&pVM->pgm.s.CTXMID(ap,PaePDs)[iPD * 2 / 512]->a[iPD * 2 % 512] == pPDEDst);
2707	# endif
2708	register GSTPDE PdeSrc = pPDSrc->a[iPD];
2709	if ( PdeSrc.n.u1Present
2710	&& (PdeSrc.n.u1User \|\| fRawR0Enabled))
2711	{
2712	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2713	/*
2714	* Check for conflicts with GC mappings.
2715	*/
2716	if (iPD == iPdNoMapping)
2717	{
2718	if (pVM->pgm.s.fMappingsFixed)
2719	{
2720	/* It's fixed, just skip the mapping. */
2721	const unsigned cPTs = pMapping->cPTs;
2722	iPD += cPTs - 1;
2723	pPDEDst += cPTs + (PGM_SHW_TYPE != PGM_TYPE_32BIT) * cPTs;
2724	pMapping = pMapping->CTXALLSUFF(pNext);
2725	iPdNoMapping = pMapping ? pMapping->GCPtr >> X86_PD_SHIFT : ~0U;
2726	continue;
2727	}
2728	# ifdef IN_RING3
2729	int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, iPD);
2730	if (VBOX_FAILURE(rc))
2731	return rc;
2732
2733	/*
2734	* Update iPdNoMapping and pMapping.
2735	*/
2736	pMapping = pVM->pgm.s.pMappingsR3;
2737	while (pMapping && pMapping->GCPtr < (iPD << X86_PD_SHIFT))
2738	pMapping = pMapping->pNextR3;
2739	iPdNoMapping = pMapping ? pMapping->GCPtr >> X86_PD_SHIFT : ~0U;
2740	# else
2741	LogFlow(("SyncCR3: detected conflict -> VINF_PGM_SYNC_CR3\n"));
2742	return VINF_PGM_SYNC_CR3;
2743	# endif
2744	}
2745	# else /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2746	/* PAE and AMD64 modes are hardware accelerated only, so there are no mappings. */
2747	Assert(iPD != iPdNoMapping);
2748	# endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2749	/*
2750	* Sync page directory entry.
2751	*
2752	* The current approach is to allocated the page table but to set
2753	* the entry to not-present and postpone the page table synching till
2754	* it's actually used.
2755	*/
2756	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2757	for (unsigned i = 0, iPdShw = iPD * 2; i < 2; i++, iPdShw++) /* pray that the compiler unrolls this */
2758	# elif PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64
2759	const unsigned iPdShw = iPD + iPDPTE * X86_PG_PAE_ENTRIES; NOREF(iPdShw);
2760	# else
2761	const unsigned iPdShw = iPD; NOREF(iPdShw);
2762	# endif
2763	{
2764	SHWPDE PdeDst = *pPDEDst;
2765	if (PdeDst.n.u1Present)
2766	{
2767	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK);
2768	RTGCPHYS GCPhys;
2769	if ( !PdeSrc.b.u1Size
2770	\|\| !(cr4 & X86_CR4_PSE))
2771	{
2772	GCPhys = PdeSrc.u & GST_PDE_PG_MASK;
2773	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2774	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
2775	GCPhys \|= i * (PAGE_SIZE / 2);
2776	# endif
2777	}
2778	else
2779	{
2780	GCPhys = PdeSrc.u & GST_PDE_BIG_PG_MASK;
2781	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2782	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
2783	GCPhys \|= i * X86_PAGE_2M_SIZE;
2784	# endif
2785	}
2786
2787	if ( pShwPage->GCPhys == GCPhys
2788	&& pShwPage->enmKind == PGM_BTH_NAME(CalcPageKind)(&PdeSrc, cr4)
2789	&& ( pShwPage->fCached
2790	\|\| ( !fGlobal
2791	&& ( false
2792	# ifdef PGM_SKIP_GLOBAL_PAGEDIRS_ON_NONGLOBAL_FLUSH
2793	\|\| ( (PdeSrc.u & (X86_PDE4M_PS \| X86_PDE4M_G)) == (X86_PDE4M_PS \| X86_PDE4M_G)
2794	&& (cr4 & (X86_CR4_PGE \| X86_CR4_PSE)) == (X86_CR4_PGE \| X86_CR4_PSE)) /* global 2/4MB page. */
2795	\|\| ( !pShwPage->fSeenNonGlobal
2796	&& (cr4 & X86_CR4_PGE))
2797	# endif
2798	)
2799	)
2800	)
2801	&& ( (PdeSrc.u & (X86_PDE_US \| X86_PDE_RW)) == (PdeDst.u & (X86_PDE_US \| X86_PDE_RW))
2802	\|\| ( (cr4 & X86_CR4_PSE)
2803	&& ((PdeSrc.u & (X86_PDE_US \| X86_PDE4M_PS \| X86_PDE4M_D)) \| PGM_PDFLAGS_TRACK_DIRTY)
2804	== ((PdeDst.u & (X86_PDE_US \| X86_PDE_RW \| PGM_PDFLAGS_TRACK_DIRTY)) \| X86_PDE4M_PS))
2805	)
2806	)
2807	{
2808	# ifdef VBOX_WITH_STATISTICS
2809	if ( !fGlobal
2810	&& (PdeSrc.u & (X86_PDE4M_PS \| X86_PDE4M_G)) == (X86_PDE4M_PS \| X86_PDE4M_G)
2811	&& (cr4 & (X86_CR4_PGE \| X86_CR4_PSE)) == (X86_CR4_PGE \| X86_CR4_PSE))
2812	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstSkippedGlobalPD));
2813	else if (!fGlobal && !pShwPage->fSeenNonGlobal && (cr4 & X86_CR4_PGE))
2814	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstSkippedGlobalPT));
2815	else
2816	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstCacheHit));
2817	# endif /* VBOX_WITH_STATISTICS */
2818	/** @todo a replacement strategy isn't really needed unless we're using a very small pool < 512 pages.
2819	* The whole ageing stuff should be put in yet another set of #ifdefs. For now, let's just skip it. */
2820	//# ifdef PGMPOOL_WITH_CACHE
2821	// pgmPoolCacheUsed(pPool, pShwPage);
2822	//# endif
2823	}
2824	else
2825	{
2826	pgmPoolFreeByPage(pPool, pShwPage, SHW_POOL_ROOT_IDX, iPdShw);
2827	pPDEDst->u = 0;
2828	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstFreed));
2829	}
2830	}
2831	else
2832	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstNotPresent));
2833	pPDEDst++;
2834	}
2835	}
2836	else if (iPD != iPdNoMapping)
2837	{
2838	/*
2839	* Check if there is any page directory to mark not present here.
2840	*/
2841	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2842	for (unsigned i = 0, iPdShw = iPD * 2; i < 2; i++, iPdShw++) /* pray that the compiler unrolls this */
2843	# elif PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64
2844	const unsigned iPdShw = iPD + iPDPTE * X86_PG_PAE_ENTRIES; NOREF(iPdShw);
2845	# else
2846	const unsigned iPdShw = iPD; NOREF(iPdShw);
2847	# endif
2848	{
2849	if (pPDEDst->n.u1Present)
2850	{
2851	pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, pPDEDst->u & SHW_PDE_PG_MASK), SHW_POOL_ROOT_IDX, iPdShw);
2852	pPDEDst->u = 0;
2853	MY_STAM_COUNTER_INC(&pVM->pgm.s.CTXMID(Stat,SyncCR3DstFreedSrcNP));
2854	}
2855	pPDEDst++;
2856	}
2857	}
2858	else
2859	{
2860	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2861	Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
2862	const unsigned cPTs = pMapping->cPTs;
2863	if (pVM->pgm.s.fMappingsFixed)
2864	{
2865	/* It's fixed, just skip the mapping. */
2866	pMapping = pMapping->CTXALLSUFF(pNext);
2867	iPdNoMapping = pMapping ? pMapping->GCPtr >> X86_PD_SHIFT : ~0U;
2868	}
2869	else
2870	{
2871	/*
2872	* Check for conflicts for subsequent pagetables
2873	* and advance to the next mapping.
2874	*/
2875	iPdNoMapping = ~0U;
2876	unsigned iPT = cPTs;
2877	while (iPT-- > 1)
2878	{
2879	if ( pPDSrc->a[iPD + iPT].n.u1Present
2880	&& (pPDSrc->a[iPD + iPT].n.u1User \|\| fRawR0Enabled))
2881	{
2882	# ifdef IN_RING3
2883	int rc = pgmR3SyncPTResolveConflict(pVM, pMapping, pPDSrc, iPD);
2884	if (VBOX_FAILURE(rc))
2885	return rc;
2886
2887	/*
2888	* Update iPdNoMapping and pMapping.
2889	*/
2890	pMapping = pVM->pgm.s.CTXALLSUFF(pMappings);
2891	while (pMapping && pMapping->GCPtr < (iPD << X86_PD_SHIFT))
2892	pMapping = pMapping->CTXALLSUFF(pNext);
2893	iPdNoMapping = pMapping ? pMapping->GCPtr >> X86_PD_SHIFT : ~0U;
2894	break;
2895	# else
2896	LogFlow(("SyncCR3: detected conflict -> VINF_PGM_SYNC_CR3\n"));
2897	return VINF_PGM_SYNC_CR3;
2898	# endif
2899	}
2900	}
2901	if (iPdNoMapping == ~0U && pMapping)
2902	{
2903	pMapping = pMapping->CTXALLSUFF(pNext);
2904	if (pMapping)
2905	iPdNoMapping = pMapping->GCPtr >> X86_PD_SHIFT;
2906	}
2907	}
2908
2909	/* advance. */
2910	iPD += cPTs - 1;
2911	pPDEDst += cPTs + (PGM_SHW_TYPE != PGM_TYPE_32BIT) * cPTs;
2912	# else /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2913	/* PAE and AMD64 modes are hardware accelerated only, so there are no mappings. */
2914	AssertFailed();
2915	# endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */
2916	}
2917
2918	} /* for iPD */
2919	} /* for each PDPTE (PAE) */
2920
2921	return VINF_SUCCESS;
2922
2923	#elif PGM_GST_TYPE == PGM_TYPE_AMD64
2924	//# error not implemented
2925	return VERR_INTERNAL_ERROR;
2926	#else /* guest real and protected mode */
2927	return VINF_SUCCESS;
2928	#endif
2929	}
2930
2931
2932
2933
2934	#ifdef VBOX_STRICT
2935	#ifdef IN_GC
2936	# undef AssertMsgFailed
2937	# define AssertMsgFailed Log
2938	#endif
2939	#ifdef IN_RING3
2940	# include <VBox/dbgf.h>
2941
2942	/**
2943	* Dumps a page table hierarchy use only physical addresses and cr4/lm flags.
2944	*
2945	* @returns VBox status code (VINF_SUCCESS).
2946	* @param pVM The VM handle.
2947	* @param cr3 The root of the hierarchy.
2948	* @param crr The cr4, only PAE and PSE is currently used.
2949	* @param fLongMode Set if long mode, false if not long mode.
2950	* @param cMaxDepth Number of levels to dump.
2951	* @param pHlp Pointer to the output functions.
2952	*/
2953	__BEGIN_DECLS
2954	PGMR3DECL(int) PGMR3DumpHierarchyHC(PVM pVM, uint32_t cr3, uint32_t cr4, bool fLongMode, unsigned cMaxDepth, PCDBGFINFOHLP pHlp);
2955	__END_DECLS
2956
2957	#endif
2958
2959	/**
2960	* Checks that the shadow page table is in sync with the guest one.
2961	*
2962	* @returns The number of errors.
2963	* @param pVM The virtual machine.
2964	* @param cr3 Guest context CR3 register
2965	* @param cr4 Guest context CR4 register
2966	* @param GCPtr Where to start. Defaults to 0.
2967	* @param cb How much to check. Defaults to everything.
2968	*/
2969	PGM_BTH_DECL(unsigned, AssertCR3)(PVM pVM, uint64_t cr3, uint64_t cr4, RTGCUINTPTR GCPtr, RTGCUINTPTR cb)
2970	{
2971	unsigned cErrors = 0;
2972
2973	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
2974	\|\| PGM_GST_TYPE == PGM_TYPE_PAE
2975
2976	PPGM pPGM = &pVM->pgm.s;
2977	RTHCPHYS HCPhysShw; /* page address derived from the shadow page tables. */
2978	RTGCPHYS GCPhysGst; /* page address derived from the guest page tables. */
2979	RTHCPHYS HCPhys; /* general usage. */
2980	int rc;
2981
2982	/*
2983	* Check that the Guest CR3 and all its mappings are correct.
2984	*/
2985	AssertMsgReturn(pPGM->GCPhysCR3 == (cr3 & GST_CR3_PAGE_MASK),
2986	("Invalid GCPhysCR3=%VGp cr3=%VGp\n", pPGM->GCPhysCR3, (RTGCPHYS)cr3),
2987	false);
2988	# ifndef IN_RING0
2989	# if PGM_GST_TYPE == PGM_TYPE_32BIT
2990	rc = PGMShwGetPage(pVM, pPGM->pGuestPDGC, NULL, &HCPhysShw);
2991	# else
2992	rc = PGMShwGetPage(pVM, pPGM->pGstPaePDPTGC, NULL, &HCPhysShw);
2993	# endif
2994	AssertRCReturn(rc, 1);
2995	HCPhys = NIL_RTHCPHYS;
2996	rc = pgmRamGCPhys2HCPhys(pPGM, cr3 & GST_CR3_PAGE_MASK, &HCPhys);
2997	AssertMsgReturn(HCPhys == HCPhysShw, ("HCPhys=%VHp HCPhyswShw=%VHp (cr3)\n", HCPhys, HCPhysShw), false);
2998	# if PGM_GST_TYPE == PGM_TYPE_32BIT && defined(IN_RING3)
2999	RTGCPHYS GCPhys;
3000	rc = PGMR3DbgHCPtr2GCPhys(pVM, pPGM->pGuestPDHC, &GCPhys);
3001	AssertRCReturn(rc, 1);
3002	AssertMsgReturn((cr3 & GST_CR3_PAGE_MASK) == GCPhys, ("GCPhys=%VGp cr3=%VGp\n", GCPhys, (RTGCPHYS)cr3), false);
3003	# endif
3004	#endif /* !IN_RING0 */
3005
3006	# if PGM_GST_TYPE == PGM_TYPE_32BIT
3007	const GSTPD *pPDSrc = CTXSUFF(pPGM->pGuestPD);
3008	# endif
3009
3010	/*
3011	* Get and check the Shadow CR3.
3012	*/
3013	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
3014	const X86PD *pPDDst = pPGM->CTXMID(p,32BitPD);
3015	unsigned cPDEs = ELEMENTS(pPDDst->a);
3016	# else
3017	const X86PDPAE pPDDst = pPGM->CTXMID(ap,PaePDs[0]); / use it as a 2048 entry PD */
3018	unsigned cPDEs = ELEMENTS(pPDDst->a) * ELEMENTS(pPGM->apHCPaePDs);
3019	# endif
3020	if (cb != ~(RTGCUINTPTR)0)
3021	cPDEs = RT_MIN(cb >> SHW_PD_SHIFT, 1);
3022
3023	/** @todo call the other two PGMAssert() functions. /
3024
3025	# if PGM_GST_TYPE == PGM_TYPE_PAE
3026	/*
3027	* Check the 4 PDPTs too.
3028	*/
3029	for (unsigned i = 0; i < 4; i++)
3030	{
3031	RTHCPTR HCPtr;
3032	RTHCPHYS HCPhys;
3033	RTGCPHYS GCPhys = pVM->pgm.s.CTXSUFF(pGstPaePDPT)->a[i].u & X86_PDPE_PG_MASK;
3034	int rc2 = pgmRamGCPhys2HCPtrAndHCPhysWithFlags(&pVM->pgm.s, GCPhys, &HCPtr, &HCPhys);
3035	if (VBOX_SUCCESS(rc2))
3036	{
3037	AssertMsg( pVM->pgm.s.apGstPaePDsHC[i] == (R3R0PTRTYPE(PX86PDPAE))HCPtr
3038	&& pVM->pgm.s.apGstPaePDsGC[i] == (GCPTRTYPE(PX86PDPAE))GCPtr
3039	&& pVM->pgm.s.aGCPhysGstPaePDs[i] == GCPhys,
3040	("idx %d apGstPaePDsHC %VHv vs %VHv apGstPaePDsGC %VGv vs %VGv aGCPhysGstPaePDs %VGp vs %VGp\n",
3041	i, pVM->pgm.s.apGstPaePDsHC[i], HCPtr, pVM->pgm.s.apGstPaePDsGC[i], GCPtr, pVM->pgm.s.aGCPhysGstPaePDs[i], GCPhys));
3042	}
3043	}
3044	# endif
3045
3046	/*
3047	* Iterate the shadow page directory.
3048	*/
3049	GCPtr = (GCPtr >> SHW_PD_SHIFT) << SHW_PD_SHIFT;
3050	unsigned iPDDst = GCPtr >> SHW_PD_SHIFT;
3051	cPDEs += iPDDst;
3052	for (;
3053	iPDDst < cPDEs;
3054	iPDDst++, GCPtr += _4G / cPDEs)
3055	{
3056	# if PGM_GST_TYPE == PGM_TYPE_PAE
3057	uint32_t iPDSrc;
3058	PGSTPD pPDSrc = pgmGstGetPaePDPtr(pPGM, (RTGCUINTPTR)GCPtr, &iPDSrc);
3059	if (!pPDSrc)
3060	continue;
3061	#endif
3062
3063	const SHWPDE PdeDst = pPDDst->a[iPDDst];
3064	if (PdeDst.u & PGM_PDFLAGS_MAPPING)
3065	{
3066	Assert(pgmMapAreMappingsEnabled(&pVM->pgm.s));
3067	if ((PdeDst.u & X86_PDE_AVL_MASK) != PGM_PDFLAGS_MAPPING)
3068	{
3069	AssertMsgFailed(("Mapping shall only have PGM_PDFLAGS_MAPPING set! PdeDst.u=%#RX64\n", (uint64_t)PdeDst.u));
3070	cErrors++;
3071	continue;
3072	}
3073	}
3074	else if ( (PdeDst.u & X86_PDE_P)
3075	\|\| ((PdeDst.u & (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY)) == (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY))
3076	)
3077	{
3078	HCPhysShw = PdeDst.u & SHW_PDE_PG_MASK;
3079	PPGMPOOLPAGE pPoolPage = pgmPoolGetPageByHCPhys(pVM, HCPhysShw);
3080	if (!pPoolPage)
3081	{
3082	AssertMsgFailed(("Invalid page table address %VGp at %VGv! PdeDst=%#RX64\n",
3083	HCPhysShw, GCPtr, (uint64_t)PdeDst.u));
3084	cErrors++;
3085	continue;
3086	}
3087	const SHWPT pPTDst = (const SHWPT )PGMPOOL_PAGE_2_PTR(pVM, pPoolPage);
3088
3089	if (PdeDst.u & (X86_PDE4M_PWT \| X86_PDE4M_PCD))
3090	{
3091	AssertMsgFailed(("PDE flags PWT and/or PCD is set at %VGv! These flags are not virtualized! PdeDst=%#RX64\n",
3092	GCPtr, (uint64_t)PdeDst.u));
3093	cErrors++;
3094	}
3095
3096	if (PdeDst.u & (X86_PDE4M_G \| X86_PDE4M_D))
3097	{
3098	AssertMsgFailed(("4K PDE reserved flags at %VGv! PdeDst=%#RX64\n",
3099	GCPtr, (uint64_t)PdeDst.u));
3100	cErrors++;
3101	}
3102
3103	const GSTPDE PdeSrc = pPDSrc->a[(iPDDst >> (GST_PD_SHIFT - SHW_PD_SHIFT)) & GST_PD_MASK];
3104	if (!PdeSrc.n.u1Present)
3105	{
3106	AssertMsgFailed(("Guest PDE at %VGv is not present! PdeDst=%#RX64 PdeSrc=%#RX64\n",
3107	GCPtr, (uint64_t)PdeDst.u, (uint64_t)PdeSrc.u));
3108	cErrors++;
3109	continue;
3110	}
3111
3112	if ( !PdeSrc.b.u1Size
3113	\|\| !(cr4 & X86_CR4_PSE))
3114	{
3115	GCPhysGst = PdeSrc.u & GST_PDE_PG_MASK;
3116	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3117	GCPhysGst \|= (iPDDst & 1) * (PAGE_SIZE / 2);
3118	# endif
3119	}
3120	else
3121	{
3122	# if PGM_GST_TYPE == PGM_TYPE_32BIT
3123	if (PdeSrc.u & X86_PDE4M_PG_HIGH_MASK)
3124	{
3125	AssertMsgFailed(("Guest PDE at %VGv is using PSE36 or similar! PdeSrc=%#RX64\n",
3126	GCPtr, (uint64_t)PdeSrc.u));
3127	cErrors++;
3128	continue;
3129	}
3130	# endif
3131	GCPhysGst = PdeSrc.u & GST_PDE_BIG_PG_MASK;
3132	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3133	GCPhysGst \|= GCPtr & RT_BIT(X86_PAGE_2M_SHIFT);
3134	# endif
3135	}
3136
3137	if ( pPoolPage->enmKind
3138	!= (!PdeSrc.b.u1Size \|\| !(cr4 & X86_CR4_PSE) ? BTH_PGMPOOLKIND_PT_FOR_PT : BTH_PGMPOOLKIND_PT_FOR_BIG))
3139	{
3140	AssertMsgFailed(("Invalid shadow page table kind %d at %VGv! PdeSrc=%#RX64\n",
3141	pPoolPage->enmKind, GCPtr, (uint64_t)PdeSrc.u));
3142	cErrors++;
3143	}
3144
3145	PPGMPAGE pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst);
3146	if (!pPhysPage)
3147	{
3148	AssertMsgFailed(("Cannot find guest physical address %VGp in the PDE at %VGv! PdeSrc=%#RX64\n",
3149	GCPhysGst, GCPtr, (uint64_t)PdeSrc.u));
3150	cErrors++;
3151	continue;
3152	}
3153
3154	if (GCPhysGst != pPoolPage->GCPhys)
3155	{
3156	AssertMsgFailed(("GCPhysGst=%VGp != pPage->GCPhys=%VGp at %VGv\n",
3157	GCPhysGst, pPoolPage->GCPhys, GCPtr));
3158	cErrors++;
3159	continue;
3160	}
3161
3162	if ( !PdeSrc.b.u1Size
3163	\|\| !(cr4 & X86_CR4_PSE))
3164	{
3165	/*
3166	* Page Table.
3167	*/
3168	const GSTPT *pPTSrc;
3169	rc = PGM_GCPHYS_2_PTR(pVM, GCPhysGst & ~(RTGCPHYS)(PAGE_SIZE - 1), &pPTSrc);
3170	if (VBOX_FAILURE(rc))
3171	{
3172	AssertMsgFailed(("Cannot map/convert guest physical address %VGp in the PDE at %VGv! PdeSrc=%#RX64\n",
3173	GCPhysGst, GCPtr, (uint64_t)PdeSrc.u));
3174	cErrors++;
3175	continue;
3176	}
3177	if ( (PdeSrc.u & (X86_PDE_P \| X86_PDE_US \| X86_PDE_RW/* \| X86_PDE_A*/))
3178	!= (PdeDst.u & (X86_PDE_P \| X86_PDE_US \| X86_PDE_RW/* \| X86_PDE_A*/)))
3179	{
3180	/// @todo We get here a lot on out-of-sync CR3 entries. The access handler should zap them to avoid false alarms here!
3181	// (This problem will go away when/if we shadow multiple CR3s.)
3182	AssertMsgFailed(("4K PDE flags mismatch at %VGv! PdeSrc=%#RX64 PdeDst=%#RX64\n",
3183	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3184	cErrors++;
3185	continue;
3186	}
3187	if (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)
3188	{
3189	AssertMsgFailed(("4K PDEs cannot have PGM_PDFLAGS_TRACK_DIRTY set! GCPtr=%VGv PdeDst=%#RX64\n",
3190	GCPtr, (uint64_t)PdeDst.u));
3191	cErrors++;
3192	continue;
3193	}
3194
3195	/* iterate the page table. */
3196	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3197	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
3198	const unsigned offPTSrc = ((GCPtr >> SHW_PD_SHIFT) & 1) * 512;
3199	# else
3200	const unsigned offPTSrc = 0;
3201	# endif
3202	for (unsigned iPT = 0, off = 0;
3203	iPT < ELEMENTS(pPTDst->a);
3204	iPT++, off += PAGE_SIZE)
3205	{
3206	const SHWPTE PteDst = pPTDst->a[iPT];
3207
3208	/* skip not-present entries. */
3209	if (!(PteDst.u & (X86_PTE_P \| PGM_PTFLAGS_TRACK_DIRTY))) /** @todo deal with ALL handlers and CSAM !P pages! */
3210	continue;
3211	Assert(PteDst.n.u1Present);
3212
3213	const GSTPTE PteSrc = pPTSrc->a[iPT + offPTSrc];
3214	if (!PteSrc.n.u1Present)
3215	{
3216	#ifdef IN_RING3
3217	PGMAssertHandlerAndFlagsInSync(pVM);
3218	PGMR3DumpHierarchyGC(pVM, cr3, cr4, (PdeSrc.u & GST_PDE_PG_MASK));
3219	#endif
3220	AssertMsgFailed(("Out of sync (!P) PTE at %VGv! PteSrc=%#RX64 PteDst=%#RX64 pPTSrc=%VGv iPTSrc=%x PdeSrc=%x physpte=%VGp\n",
3221	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u, pPTSrc, iPT + offPTSrc, PdeSrc.au32[0],
3222	(PdeSrc.u & GST_PDE_PG_MASK) + (iPT + offPTSrc)*sizeof(PteSrc)));
3223	cErrors++;
3224	continue;
3225	}
3226
3227	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;
3228	# if 1 /** @todo sync accessed bit properly... */
3229	fIgnoreFlags \|= X86_PTE_A;
3230	# endif
3231
3232	/* match the physical addresses */
3233	HCPhysShw = PteDst.u & SHW_PTE_PG_MASK;
3234	GCPhysGst = PteSrc.u & GST_PTE_PG_MASK;
3235
3236	# ifdef IN_RING3
3237	rc = PGMPhysGCPhys2HCPhys(pVM, GCPhysGst, &HCPhys);
3238	if (VBOX_FAILURE(rc))
3239	{
3240	if (HCPhysShw != MMR3PageDummyHCPhys(pVM))
3241	{
3242	AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PteSrc=%#RX64 PteDst=%#RX64\n",
3243	GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3244	cErrors++;
3245	continue;
3246	}
3247	}
3248	else if (HCPhysShw != (HCPhys & SHW_PTE_PG_MASK))
3249	{
3250	AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n",
3251	GCPtr + off, HCPhysShw, HCPhys, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3252	cErrors++;
3253	continue;
3254	}
3255	# endif
3256
3257	pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst);
3258	if (!pPhysPage)
3259	{
3260	# ifdef IN_RING3 /** @todo make MMR3PageDummyHCPhys an 'All' function! */
3261	if (HCPhysShw != MMR3PageDummyHCPhys(pVM))
3262	{
3263	AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PteSrc=%#RX64 PteDst=%#RX64\n",
3264	GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3265	cErrors++;
3266	continue;
3267	}
3268	# endif
3269	if (PteDst.n.u1Write)
3270	{
3271	AssertMsgFailed(("Invalid guest page at %VGv is writable! GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n",
3272	GCPtr + off, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3273	cErrors++;
3274	}
3275	fIgnoreFlags \|= X86_PTE_RW;
3276	}
3277	else if (HCPhysShw != (PGM_PAGE_GET_HCPHYS(pPhysPage) & SHW_PTE_PG_MASK))
3278	{
3279	AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PteSrc=%#RX64 PteDst=%#RX64\n",
3280	GCPtr + off, HCPhysShw, pPhysPage->HCPhys, GCPhysGst, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3281	cErrors++;
3282	continue;
3283	}
3284
3285	/* flags */
3286	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPhysPage))
3287	{
3288	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPhysPage))
3289	{
3290	if (PteDst.n.u1Write)
3291	{
3292	AssertMsgFailed(("WRITE access flagged at %VGv but the page is writable! HCPhys=%VGv PteSrc=%#RX64 PteDst=%#RX64\n",
3293	GCPtr + off, pPhysPage->HCPhys, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3294	cErrors++;
3295	continue;
3296	}
3297	fIgnoreFlags \|= X86_PTE_RW;
3298	}
3299	else
3300	{
3301	if (PteDst.n.u1Present)
3302	{
3303	AssertMsgFailed(("ALL access flagged at %VGv but the page is present! HCPhys=%VHp PteSrc=%#RX64 PteDst=%#RX64\n",
3304	GCPtr + off, pPhysPage->HCPhys, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3305	cErrors++;
3306	continue;
3307	}
3308	fIgnoreFlags \|= X86_PTE_P;
3309	}
3310	}
3311	else
3312	{
3313	if (!PteSrc.n.u1Dirty && PteSrc.n.u1Write)
3314	{
3315	if (PteDst.n.u1Write)
3316	{
3317	AssertMsgFailed(("!DIRTY page at %VGv is writable! PteSrc=%#RX64 PteDst=%#RX64\n",
3318	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3319	cErrors++;
3320	continue;
3321	}
3322	if (!(PteDst.u & PGM_PTFLAGS_TRACK_DIRTY))
3323	{
3324	AssertMsgFailed(("!DIRTY page at %VGv is not marked TRACK_DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n",
3325	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3326	cErrors++;
3327	continue;
3328	}
3329	if (PteDst.n.u1Dirty)
3330	{
3331	AssertMsgFailed(("!DIRTY page at %VGv is marked DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n",
3332	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3333	cErrors++;
3334	}
3335	# if 0 /** @todo sync access bit properly... */
3336	if (PteDst.n.u1Accessed != PteSrc.n.u1Accessed)
3337	{
3338	AssertMsgFailed(("!DIRTY page at %VGv is has mismatching accessed bit! PteSrc=%#RX64 PteDst=%#RX64\n",
3339	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3340	cErrors++;
3341	}
3342	fIgnoreFlags \|= X86_PTE_RW;
3343	# else
3344	fIgnoreFlags \|= X86_PTE_RW \| X86_PTE_A;
3345	# endif
3346	}
3347	else if (PteDst.u & PGM_PTFLAGS_TRACK_DIRTY)
3348	{
3349	/* access bit emulation (not implemented). */
3350	if (PteSrc.n.u1Accessed \|\| PteDst.n.u1Present)
3351	{
3352	AssertMsgFailed(("PGM_PTFLAGS_TRACK_DIRTY set at %VGv but no accessed bit emulation! PteSrc=%#RX64 PteDst=%#RX64\n",
3353	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3354	cErrors++;
3355	continue;
3356	}
3357	if (!PteDst.n.u1Accessed)
3358	{
3359	AssertMsgFailed(("!ACCESSED page at %VGv is has the accessed bit set! PteSrc=%#RX64 PteDst=%#RX64\n",
3360	GCPtr + off, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3361	cErrors++;
3362	}
3363	fIgnoreFlags \|= X86_PTE_P;
3364	}
3365	# ifdef DEBUG_sandervl
3366	fIgnoreFlags \|= X86_PTE_D \| X86_PTE_A;
3367	# endif
3368	}
3369
3370	if ( (PteSrc.u & ~fIgnoreFlags) != (PteDst.u & ~fIgnoreFlags)
3371	&& (PteSrc.u & ~(fIgnoreFlags \| X86_PTE_RW)) != (PteDst.u & ~fIgnoreFlags)
3372	)
3373	{
3374	AssertMsgFailed(("Flags mismatch at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PteSrc=%#RX64 PteDst=%#RX64\n",
3375	GCPtr + off, (uint64_t)PteSrc.u & ~fIgnoreFlags, (uint64_t)PteDst.u & ~fIgnoreFlags,
3376	fIgnoreFlags, (uint64_t)PteSrc.u, (uint64_t)PteDst.u));
3377	cErrors++;
3378	continue;
3379	}
3380	} /* foreach PTE */
3381	}
3382	else
3383	{
3384	/*
3385	* Big Page.
3386	*/
3387	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;
3388	if (!PdeSrc.b.u1Dirty && PdeSrc.b.u1Write)
3389	{
3390	if (PdeDst.n.u1Write)
3391	{
3392	AssertMsgFailed(("!DIRTY page at %VGv is writable! PdeSrc=%#RX64 PdeDst=%#RX64\n",
3393	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3394	cErrors++;
3395	continue;
3396	}
3397	if (!(PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY))
3398	{
3399	AssertMsgFailed(("!DIRTY page at %VGv is not marked TRACK_DIRTY! PteSrc=%#RX64 PteDst=%#RX64\n",
3400	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3401	cErrors++;
3402	continue;
3403	}
3404	# if 0 /** @todo sync access bit properly... */
3405	if (PdeDst.n.u1Accessed != PdeSrc.b.u1Accessed)
3406	{
3407	AssertMsgFailed(("!DIRTY page at %VGv is has mismatching accessed bit! PteSrc=%#RX64 PteDst=%#RX64\n",
3408	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3409	cErrors++;
3410	}
3411	fIgnoreFlags \|= X86_PTE_RW;
3412	# else
3413	fIgnoreFlags \|= X86_PTE_RW \| X86_PTE_A;
3414	# endif
3415	}
3416	else if (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)
3417	{
3418	/* access bit emulation (not implemented). */
3419	if (PdeSrc.b.u1Accessed \|\| PdeDst.n.u1Present)
3420	{
3421	AssertMsgFailed(("PGM_PDFLAGS_TRACK_DIRTY set at %VGv but no accessed bit emulation! PdeSrc=%#RX64 PdeDst=%#RX64\n",
3422	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3423	cErrors++;
3424	continue;
3425	}
3426	if (!PdeDst.n.u1Accessed)
3427	{
3428	AssertMsgFailed(("!ACCESSED page at %VGv is has the accessed bit set! PdeSrc=%#RX64 PdeDst=%#RX64\n",
3429	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3430	cErrors++;
3431	}
3432	fIgnoreFlags \|= X86_PTE_P;
3433	}
3434
3435	if ((PdeSrc.u & ~fIgnoreFlags) != (PdeDst.u & ~fIgnoreFlags))
3436	{
3437	AssertMsgFailed(("Flags mismatch (B) at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PdeSrc=%#RX64 PdeDst=%#RX64\n",
3438	GCPtr, (uint64_t)PdeSrc.u & ~fIgnoreFlags, (uint64_t)PdeDst.u & ~fIgnoreFlags,
3439	fIgnoreFlags, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
3440	cErrors++;
3441	}
3442
3443	/* iterate the page table. */
3444	for (unsigned iPT = 0, off = 0;
3445	iPT < ELEMENTS(pPTDst->a);
3446	iPT++, off += PAGE_SIZE, GCPhysGst += PAGE_SIZE)
3447	{
3448	const SHWPTE PteDst = pPTDst->a[iPT];
3449
3450	if (PteDst.u & PGM_PTFLAGS_TRACK_DIRTY)
3451	{
3452	AssertMsgFailed(("The PTE at %VGv emulating a 2/4M page is marked TRACK_DIRTY! PdeSrc=%#RX64 PteDst=%#RX64\n",
3453	GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3454	cErrors++;
3455	}
3456
3457	/* skip not-present entries. */
3458	if (!PteDst.n.u1Present) /** @todo deal with ALL handlers and CSAM !P pages! */
3459	continue;
3460
3461	fIgnoreFlags = X86_PTE_PAE_PG_MASK \| X86_PTE_AVL_MASK \| X86_PTE_PWT \| X86_PTE_PCD \| X86_PTE_PAT;
3462
3463	/* match the physical addresses */
3464	HCPhysShw = PteDst.u & X86_PTE_PAE_PG_MASK;
3465
3466	# ifdef IN_RING3
3467	rc = PGMPhysGCPhys2HCPhys(pVM, GCPhysGst, &HCPhys);
3468	if (VBOX_FAILURE(rc))
3469	{
3470	if (HCPhysShw != MMR3PageDummyHCPhys(pVM))
3471	{
3472	AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PdeSrc=%#RX64 PteDst=%#RX64\n",
3473	GCPhysGst, GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3474	cErrors++;
3475	}
3476	}
3477	else if (HCPhysShw != (HCPhys & X86_PTE_PAE_PG_MASK))
3478	{
3479	AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n",
3480	GCPtr + off, HCPhysShw, HCPhys, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3481	cErrors++;
3482	continue;
3483	}
3484	# endif
3485
3486	pPhysPage = pgmPhysGetPage(pPGM, GCPhysGst);
3487	if (!pPhysPage)
3488	{
3489	# ifdef IN_RING3 /** @todo make MMR3PageDummyHCPhys an 'All' function! */
3490	if (HCPhysShw != MMR3PageDummyHCPhys(pVM))
3491	{
3492	AssertMsgFailed(("Cannot find guest physical address %VGp at %VGv! PdeSrc=%#RX64 PteDst=%#RX64\n",
3493	GCPhysGst, GCPtr + off, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3494	cErrors++;
3495	continue;
3496	}
3497	# endif
3498	if (PteDst.n.u1Write)
3499	{
3500	AssertMsgFailed(("Invalid guest page at %VGv is writable! GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n",
3501	GCPtr + off, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3502	cErrors++;
3503	}
3504	fIgnoreFlags \|= X86_PTE_RW;
3505	}
3506	else if (HCPhysShw != (pPhysPage->HCPhys & X86_PTE_PAE_PG_MASK))
3507	{
3508	AssertMsgFailed(("Out of sync (phys) at %VGv! HCPhysShw=%VHp HCPhys=%VHp GCPhysGst=%VGp PdeSrc=%#RX64 PteDst=%#RX64\n",
3509	GCPtr + off, HCPhysShw, pPhysPage->HCPhys, GCPhysGst, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3510	cErrors++;
3511	continue;
3512	}
3513
3514	/* flags */
3515	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPhysPage))
3516	{
3517	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPhysPage))
3518	{
3519	if (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage) != PGM_PAGE_HNDL_PHYS_STATE_DISABLED)
3520	{
3521	if (PteDst.n.u1Write)
3522	{
3523	AssertMsgFailed(("WRITE access flagged at %VGv but the page is writable! HCPhys=%VGv PdeSrc=%#RX64 PteDst=%#RX64\n",
3524	GCPtr + off, pPhysPage->HCPhys, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3525	cErrors++;
3526	continue;
3527	}
3528	fIgnoreFlags \|= X86_PTE_RW;
3529	}
3530	}
3531	else
3532	{
3533	if (PteDst.n.u1Present)
3534	{
3535	AssertMsgFailed(("ALL access flagged at %VGv but the page is present! HCPhys=%VGv PdeSrc=%#RX64 PteDst=%#RX64\n",
3536	GCPtr + off, pPhysPage->HCPhys, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3537	cErrors++;
3538	continue;
3539	}
3540	fIgnoreFlags \|= X86_PTE_P;
3541	}
3542	}
3543
3544	if ( (PdeSrc.u & ~fIgnoreFlags) != (PteDst.u & ~fIgnoreFlags)
3545	&& (PdeSrc.u & ~(fIgnoreFlags \| X86_PTE_RW)) != (PteDst.u & ~fIgnoreFlags) /* lazy phys handler dereg. */
3546	)
3547	{
3548	AssertMsgFailed(("Flags mismatch (BT) at %VGv! %#RX64 != %#RX64 fIgnoreFlags=%#RX64 PdeSrc=%#RX64 PteDst=%#RX64\n",
3549	GCPtr + off, (uint64_t)PdeSrc.u & ~fIgnoreFlags, (uint64_t)PteDst.u & ~fIgnoreFlags,
3550	fIgnoreFlags, (uint64_t)PdeSrc.u, (uint64_t)PteDst.u));
3551	cErrors++;
3552	continue;
3553	}
3554	} /* foreach PTE */
3555	}
3556	}
3557	/* not present */
3558
3559	} /* forearch PDE */
3560
3561	# ifdef DEBUG
3562	if (cErrors)
3563	LogFlow(("AssertCR3: cErrors=%d\n", cErrors));
3564	# endif
3565
3566	#elif PGM_GST_TYPE == PGM_TYPE_PAE
3567	//# error not implemented
3568
3569
3570	#elif PGM_GST_TYPE == PGM_TYPE_AMD64
3571	//# error not implemented
3572
3573	/#else: guest real and protected mode /
3574	#endif
3575	return cErrors;
3576	}
3577	#endif /* VBOX_STRICT */
3578

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllBth.h@ 7873

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