PGMAllBth.h@ 100594

Last change on this file since 100594 was 100243, checked in by vboxsync, 18 months ago
VMM/PGM: Nested VMX: bugref:10474 Prevent log flooding just in case.
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File size: 233.0 KB

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1	/* $Id: PGMAllBth.h 100243 2023-06-22 03:57:57Z vboxsync $ */
2	/** @file
3	* VBox - Page Manager, Shadow+Guest Paging Template - All context code.
4	*
5	* @remarks Extended page tables (intel) are built with PGM_GST_TYPE set to
6	* PGM_TYPE_PROT (and PGM_SHW_TYPE set to PGM_TYPE_EPT).
7	* bird: WTF does this mean these days? Looking at PGMAll.cpp it's
8	*
9	* @remarks This file is one big \#ifdef-orgy!
10	*
11	*/
12
13	/*
14	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
15	*
16	* This file is part of VirtualBox base platform packages, as
17	* available from https://www.virtualbox.org.
18	*
19	* This program is free software; you can redistribute it and/or
20	* modify it under the terms of the GNU General Public License
21	* as published by the Free Software Foundation, in version 3 of the
22	* License.
23	*
24	* This program is distributed in the hope that it will be useful, but
25	* WITHOUT ANY WARRANTY; without even the implied warranty of
26	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27	* General Public License for more details.
28	*
29	* You should have received a copy of the GNU General Public License
30	* along with this program; if not, see <https://www.gnu.org/licenses>.
31	*
32	* SPDX-License-Identifier: GPL-3.0-only
33	*/
34
35	#ifdef _MSC_VER
36	/** @todo we're generating unnecessary code in nested/ept shadow mode and for
37	* real/prot-guest+RC mode. */
38	# pragma warning(disable: 4505)
39	#endif
40
41
42	/*********************************************************************************************************************************
43	* Internal Functions *
44	*********************************************************************************************************************************/
45	RT_C_DECLS_BEGIN
46	PGM_BTH_DECL(int, Enter)(PVMCPUCC pVCpu, RTGCPHYS GCPhysCR3);
47	#ifndef IN_RING3
48	PGM_BTH_DECL(int, Trap0eHandler)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx, RTGCPTR pvFault, bool *pfLockTaken);
49	PGM_BTH_DECL(int, NestedTrap0eHandler)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx, RTGCPHYS GCPhysNestedFault,
50	bool fIsLinearAddrValid, RTGCPTR GCPtrNestedFault, PPGMPTWALK pWalk, bool *pfLockTaken);
51	# if defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT) && PGM_SHW_TYPE == PGM_TYPE_EPT
52	static void PGM_BTH_NAME(NestedSyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPte, RTGCPHYS GCPhysPage, PPGMPOOLPAGE pShwPage,
53	unsigned iPte, PCPGMPTWALKGST pGstWalkAll);
54	static int PGM_BTH_NAME(NestedSyncPage)(PVMCPUCC pVCpu, RTGCPHYS GCPhysNestedPage, RTGCPHYS GCPhysPage, unsigned cPages,
55	uint32_t uErr, PPGMPTWALKGST pGstWalkAll);
56	static int PGM_BTH_NAME(NestedSyncPT)(PVMCPUCC pVCpu, RTGCPHYS GCPhysNestedPage, RTGCPHYS GCPhysPage, PPGMPTWALKGST pGstWalkAll);
57	# endif /* VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
58	#endif
59	PGM_BTH_DECL(int, InvalidatePage)(PVMCPUCC pVCpu, RTGCPTR GCPtrPage);
60	static int PGM_BTH_NAME(SyncPage)(PVMCPUCC pVCpu, GSTPDE PdeSrc, RTGCPTR GCPtrPage, unsigned cPages, unsigned uErr);
61	static int PGM_BTH_NAME(CheckDirtyPageFault)(PVMCPUCC pVCpu, uint32_t uErr, PSHWPDE pPdeDst, GSTPDE const *pPdeSrc, RTGCPTR GCPtrPage);
62	static int PGM_BTH_NAME(SyncPT)(PVMCPUCC pVCpu, unsigned iPD, PGSTPD pPDSrc, RTGCPTR GCPtrPage);
63	#if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
64	static void PGM_BTH_NAME(SyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPteDst, GSTPDE PdeSrc, GSTPTE PteSrc, PPGMPOOLPAGE pShwPage, unsigned iPTDst);
65	#else
66	static void PGM_BTH_NAME(SyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPteDst, RTGCPHYS GCPhysPage, PPGMPOOLPAGE pShwPage, unsigned iPTDst);
67	#endif
68	PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVMCPUCC pVCpu, RTGCPTR Addr, unsigned fPage, unsigned uErr);
69	PGM_BTH_DECL(int, PrefetchPage)(PVMCPUCC pVCpu, RTGCPTR GCPtrPage);
70	PGM_BTH_DECL(int, SyncCR3)(PVMCPUCC pVCpu, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal);
71	#ifdef VBOX_STRICT
72	PGM_BTH_DECL(unsigned, AssertCR3)(PVMCPUCC pVCpu, uint64_t cr3, uint64_t cr4, RTGCPTR GCPtr = 0, RTGCPTR cb = ~(RTGCPTR)0);
73	#endif
74	PGM_BTH_DECL(int, MapCR3)(PVMCPUCC pVCpu, RTGCPHYS GCPhysCR3);
75	PGM_BTH_DECL(int, UnmapCR3)(PVMCPUCC pVCpu);
76
77	#ifdef IN_RING3
78	PGM_BTH_DECL(int, Relocate)(PVMCPUCC pVCpu, RTGCPTR offDelta);
79	#endif
80	RT_C_DECLS_END
81
82
83
84
85	/*
86	* Filter out some illegal combinations of guest and shadow paging, so we can
87	* remove redundant checks inside functions.
88	*/
89	#if PGM_GST_TYPE == PGM_TYPE_PAE && PGM_SHW_TYPE != PGM_TYPE_PAE \
90	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE
91	# error "Invalid combination; PAE guest implies PAE shadow"
92	#endif
93
94	#if (PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
95	&& !( PGM_SHW_TYPE == PGM_TYPE_32BIT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE \|\| PGM_SHW_TYPE == PGM_TYPE_AMD64 \
96	\|\| PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \|\| PGM_SHW_TYPE == PGM_TYPE_NONE)
97	# error "Invalid combination; real or protected mode without paging implies 32 bits or PAE shadow paging."
98	#endif
99
100	#if (PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_PAE) \
101	&& !( PGM_SHW_TYPE == PGM_TYPE_32BIT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE \
102	\|\| PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \|\| PGM_SHW_TYPE == PGM_TYPE_NONE)
103	# error "Invalid combination; 32 bits guest paging or PAE implies 32 bits or PAE shadow paging."
104	#endif
105
106	#if (PGM_GST_TYPE == PGM_TYPE_AMD64 && PGM_SHW_TYPE != PGM_TYPE_AMD64 && !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE) \
107	\|\| (PGM_SHW_TYPE == PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_PROT)
108	# error "Invalid combination; AMD64 guest implies AMD64 shadow and vice versa"
109	#endif
110
111
112	/**
113	* Enters the shadow+guest mode.
114	*
115	* @returns VBox status code.
116	* @param pVCpu The cross context virtual CPU structure.
117	* @param GCPhysCR3 The physical address from the CR3 register.
118	*/
119	PGM_BTH_DECL(int, Enter)(PVMCPUCC pVCpu, RTGCPHYS GCPhysCR3)
120	{
121	/* Here we deal with allocation of the root shadow page table for real and protected mode during mode switches;
122	* Other modes rely on MapCR3/UnmapCR3 to setup the shadow root page tables.
123	*/
124	#if ( ( PGM_SHW_TYPE == PGM_TYPE_32BIT \
125	\|\| PGM_SHW_TYPE == PGM_TYPE_PAE \
126	\|\| PGM_SHW_TYPE == PGM_TYPE_AMD64) \
127	&& ( PGM_GST_TYPE == PGM_TYPE_REAL \
128	\|\| PGM_GST_TYPE == PGM_TYPE_PROT))
129
130	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
131
132	Assert(!pVM->pgm.s.fNestedPaging);
133
134	PGM_LOCK_VOID(pVM);
135	/* Note: we only really need shadow paging in real and protected mode for VT-x and AMD-V (excluding nested paging/EPT modes),
136	* but any calls to GC need a proper shadow page setup as well.
137	*/
138	/* Free the previous root mapping if still active. */
139	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
140	PPGMPOOLPAGE pOldShwPageCR3 = pVCpu->pgm.s.CTX_SUFF(pShwPageCR3);
141	if (pOldShwPageCR3)
142	{
143	Assert(pOldShwPageCR3->enmKind != PGMPOOLKIND_FREE);
144
145	/* Mark the page as unlocked; allow flushing again. */
146	pgmPoolUnlockPage(pPool, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
147
148	pgmPoolFreeByPage(pPool, pOldShwPageCR3, NIL_PGMPOOL_IDX, UINT32_MAX);
149	pVCpu->pgm.s.pShwPageCR3R3 = NIL_RTR3PTR;
150	pVCpu->pgm.s.pShwPageCR3R0 = NIL_RTR0PTR;
151	}
152
153	/* construct a fake address. */
154	GCPhysCR3 = RT_BIT_64(63);
155	PPGMPOOLPAGE pNewShwPageCR3;
156	int rc = pgmPoolAlloc(pVM, GCPhysCR3, BTH_PGMPOOLKIND_ROOT, PGMPOOLACCESS_DONTCARE, PGM_A20_IS_ENABLED(pVCpu),
157	NIL_PGMPOOL_IDX, UINT32_MAX, false /fLockPage/,
158	&pNewShwPageCR3);
159	AssertRCReturn(rc, rc);
160
161	pVCpu->pgm.s.pShwPageCR3R3 = pgmPoolConvertPageToR3(pPool, pNewShwPageCR3);
162	pVCpu->pgm.s.pShwPageCR3R0 = pgmPoolConvertPageToR0(pPool, pNewShwPageCR3);
163
164	/* Mark the page as locked; disallow flushing. */
165	pgmPoolLockPage(pPool, pNewShwPageCR3);
166
167	/* Set the current hypervisor CR3. */
168	CPUMSetHyperCR3(pVCpu, PGMGetHyperCR3(pVCpu));
169
170	PGM_UNLOCK(pVM);
171	return rc;
172	#else
173	NOREF(pVCpu); NOREF(GCPhysCR3);
174	return VINF_SUCCESS;
175	#endif
176	}
177
178
179	#ifndef IN_RING3
180
181	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
182	/**
183	* Deal with a guest page fault.
184	*
185	* @returns Strict VBox status code.
186	* @retval VINF_EM_RAW_GUEST_TRAP
187	* @retval VINF_EM_RAW_EMULATE_INSTR
188	*
189	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
190	* @param pWalk The guest page table walk result.
191	* @param uErr The error code.
192	*/
193	PGM_BTH_DECL(VBOXSTRICTRC, Trap0eHandlerGuestFault)(PVMCPUCC pVCpu, PPGMPTWALK pWalk, RTGCUINT uErr)
194	{
195	/*
196	* Calc the error code for the guest trap.
197	*/
198	uint32_t uNewErr = GST_IS_NX_ACTIVE(pVCpu)
199	? uErr & (X86_TRAP_PF_RW \| X86_TRAP_PF_US \| X86_TRAP_PF_ID)
200	: uErr & (X86_TRAP_PF_RW \| X86_TRAP_PF_US);
201	if ( pWalk->fRsvdError
202	\|\| pWalk->fBadPhysAddr)
203	{
204	uNewErr \|= X86_TRAP_PF_RSVD \| X86_TRAP_PF_P;
205	Assert(!pWalk->fNotPresent);
206	}
207	else if (!pWalk->fNotPresent)
208	uNewErr \|= X86_TRAP_PF_P;
209	TRPMSetErrorCode(pVCpu, uNewErr);
210
211	LogFlow(("Guest trap; cr2=%RGv uErr=%RGv lvl=%d\n", pWalk->GCPtr, uErr, pWalk->uLevel));
212	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2GuestTrap; });
213	return VINF_EM_RAW_GUEST_TRAP;
214	}
215	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) */
216
217
218	#if !PGM_TYPE_IS_NESTED(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE
219	/**
220	* Deal with a guest page fault.
221	*
222	* The caller has taken the PGM lock.
223	*
224	* @returns Strict VBox status code.
225	*
226	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
227	* @param uErr The error code.
228	* @param pCtx Pointer to the register context for the CPU.
229	* @param pvFault The fault address.
230	* @param pPage The guest page at @a pvFault.
231	* @param pWalk The guest page table walk result.
232	* @param pGstWalk The guest paging-mode specific walk information.
233	* @param pfLockTaken PGM lock taken here or not (out). This is true
234	* when we're called.
235	*/
236	static VBOXSTRICTRC PGM_BTH_NAME(Trap0eHandlerDoAccessHandlers)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx,
237	RTGCPTR pvFault, PPGMPAGE pPage, bool *pfLockTaken
238	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) \|\| defined(DOXYGEN_RUNNING)
239	, PPGMPTWALK pWalk
240	, PGSTPTWALK pGstWalk
241	# endif
242	)
243	{
244	# if !PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
245	GSTPDE const PdeSrcDummy = { X86_PDE_P \| X86_PDE_US \| X86_PDE_RW \| X86_PDE_A };
246	# endif
247	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
248	VBOXSTRICTRC rcStrict;
249
250	if (PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage))
251	{
252	/*
253	* Physical page access handler.
254	*/
255	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
256	const RTGCPHYS GCPhysFault = pWalk->GCPhys;
257	# else
258	const RTGCPHYS GCPhysFault = PGM_A20_APPLY(pVCpu, (RTGCPHYS)pvFault);
259	# endif
260	PPGMPHYSHANDLER pCur;
261	rcStrict = pgmHandlerPhysicalLookup(pVM, GCPhysFault, &pCur);
262	if (RT_SUCCESS(rcStrict))
263	{
264	PCPGMPHYSHANDLERTYPEINT const pCurType = PGMPHYSHANDLER_GET_TYPE(pVM, pCur);
265
266	# ifdef PGM_SYNC_N_PAGES
267	/*
268	* If the region is write protected and we got a page not present fault, then sync
269	* the pages. If the fault was caused by a read, then restart the instruction.
270	* In case of write access continue to the GC write handler.
271	*
272	* ASSUMES that there is only one handler per page or that they have similar write properties.
273	*/
274	if ( !(uErr & X86_TRAP_PF_P)
275	&& pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE)
276	{
277	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
278	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, pGstWalk->Pde, pvFault, PGM_SYNC_NR_PAGES, uErr);
279	# else
280	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, PGM_SYNC_NR_PAGES, uErr);
281	# endif
282	if ( RT_FAILURE(rcStrict)
283	\|\| !(uErr & X86_TRAP_PF_RW)
284	\|\| rcStrict == VINF_PGM_SYNCPAGE_MODIFIED_PDE)
285	{
286	AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
287	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersOutOfSync);
288	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndPhys; });
289	return rcStrict;
290	}
291	}
292	# endif
293	# ifdef PGM_WITH_MMIO_OPTIMIZATIONS
294	/*
295	* If the access was not thru a #PF(RSVD\|...) resync the page.
296	*/
297	if ( !(uErr & X86_TRAP_PF_RSVD)
298	&& pCurType->enmKind != PGMPHYSHANDLERKIND_WRITE
299	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
300	&& (pWalk->fEffective & (PGM_PTATTRS_W_MASK \| PGM_PTATTRS_US_MASK))
301	== PGM_PTATTRS_W_MASK /** @todo Remove pGstWalk->Core.fEffectiveUS and X86_PTE_US further down in the sync code. */
302	# endif
303	)
304	{
305	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
306	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, pGstWalk->Pde, pvFault, PGM_SYNC_NR_PAGES, uErr);
307	# else
308	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, PGM_SYNC_NR_PAGES, uErr);
309	# endif
310	if ( RT_FAILURE(rcStrict)
311	\|\| rcStrict == VINF_PGM_SYNCPAGE_MODIFIED_PDE)
312	{
313	AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
314	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersOutOfSync);
315	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndPhys; });
316	return rcStrict;
317	}
318	}
319	# endif
320
321	AssertMsg( pCurType->enmKind != PGMPHYSHANDLERKIND_WRITE
322	\|\| (pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE && (uErr & X86_TRAP_PF_RW)),
323	("Unexpected trap for physical handler: %08X (phys=%08x) pPage=%R[pgmpage] uErr=%X, enmKind=%d\n",
324	pvFault, GCPhysFault, pPage, uErr, pCurType->enmKind));
325	if (pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE)
326	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysWrite);
327	else
328	{
329	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysAll);
330	if (uErr & X86_TRAP_PF_RSVD) STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysAllOpt);
331	}
332
333	if (pCurType->pfnPfHandler)
334	{
335	STAM_PROFILE_START(&pCur->Stat, h);
336
337	if (pCurType->fKeepPgmLock)
338	{
339	rcStrict = pCurType->pfnPfHandler(pVM, pVCpu, uErr, pCtx, pvFault, GCPhysFault,
340	!pCurType->fRing0DevInsIdx ? pCur->uUser
341	: (uintptr_t)PDMDeviceRing0IdxToInstance(pVM, pCur->uUser));
342
343	STAM_PROFILE_STOP(&pCur->Stat, h); /* no locking needed, entry is unlikely reused before we get here. */
344	}
345	else
346	{
347	uint64_t const uUser = !pCurType->fRing0DevInsIdx ? pCur->uUser
348	: (uintptr_t)PDMDeviceRing0IdxToInstance(pVM, pCur->uUser);
349	PGM_UNLOCK(pVM);
350	*pfLockTaken = false;
351
352	rcStrict = pCurType->pfnPfHandler(pVM, pVCpu, uErr, pCtx, pvFault, GCPhysFault, uUser);
353
354	STAM_PROFILE_STOP(&pCur->Stat, h); /* no locking needed, entry is unlikely reused before we get here. */
355	}
356	}
357	else
358	rcStrict = VINF_EM_RAW_EMULATE_INSTR;
359
360	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2HndPhys; });
361	return rcStrict;
362	}
363	AssertMsgReturn(rcStrict == VERR_NOT_FOUND, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)), rcStrict);
364	}
365
366	/*
367	* There is a handled area of the page, but this fault doesn't belong to it.
368	* We must emulate the instruction.
369	*
370	* To avoid crashing (non-fatal) in the interpreter and go back to the recompiler
371	* we first check if this was a page-not-present fault for a page with only
372	* write access handlers. Restart the instruction if it wasn't a write access.
373	*/
374	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersUnhandled);
375
376	if ( !PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)
377	&& !(uErr & X86_TRAP_PF_P))
378	{
379	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
380	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, pGstWalk->Pde, pvFault, PGM_SYNC_NR_PAGES, uErr);
381	# else
382	rcStrict = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, PGM_SYNC_NR_PAGES, uErr);
383	# endif
384	if ( RT_FAILURE(rcStrict)
385	\|\| rcStrict == VINF_PGM_SYNCPAGE_MODIFIED_PDE
386	\|\| !(uErr & X86_TRAP_PF_RW))
387	{
388	AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
389	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersOutOfSync);
390	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndPhys; });
391	return rcStrict;
392	}
393	}
394
395	/** @todo This particular case can cause quite a lot of overhead. E.g. early stage of kernel booting in Ubuntu 6.06
396	* It's writing to an unhandled part of the LDT page several million times.
397	*/
398	rcStrict = PGMInterpretInstruction(pVCpu, pvFault);
399	LogFlow(("PGM: PGMInterpretInstruction -> rcStrict=%d pPage=%R[pgmpage]\n", VBOXSTRICTRC_VAL(rcStrict), pPage));
400	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2HndUnhandled; });
401	return rcStrict;
402	} /* if any kind of handler */
403	# endif /* !PGM_TYPE_IS_NESTED(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE*/
404
405
406	/**
407	* \#PF Handler for raw-mode guest execution.
408	*
409	* @returns VBox status code (appropriate for trap handling and GC return).
410	*
411	* @param pVCpu The cross context virtual CPU structure.
412	* @param uErr The trap error code.
413	* @param pCtx Pointer to the register context for the CPU.
414	* @param pvFault The fault address.
415	* @param pfLockTaken PGM lock taken here or not (out)
416	*/
417	PGM_BTH_DECL(int, Trap0eHandler)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx, RTGCPTR pvFault, bool *pfLockTaken)
418	{
419	PVMCC pVM = pVCpu->CTX_SUFF(pVM); NOREF(pVM);
420
421	*pfLockTaken = false;
422
423	# if ( PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT \
424	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64) \
425	&& !PGM_TYPE_IS_NESTED(PGM_SHW_TYPE) \
426	&& (PGM_SHW_TYPE != PGM_TYPE_EPT \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
427	&& PGM_SHW_TYPE != PGM_TYPE_NONE
428	int rc;
429
430	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
431	/*
432	* Walk the guest page translation tables and check if it's a guest fault.
433	*/
434	PGMPTWALK Walk;
435	GSTPTWALK GstWalk;
436	rc = PGM_GST_NAME(Walk)(pVCpu, pvFault, &Walk, &GstWalk);
437	if (RT_FAILURE_NP(rc))
438	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerGuestFault)(pVCpu, &Walk, uErr));
439
440	/* assert some GstWalk sanity. */
441	# if PGM_GST_TYPE == PGM_TYPE_AMD64
442	/AssertMsg(GstWalk.Pml4e.u == GstWalk.pPml4e->u, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pml4e.u, (uint64_t)GstWalk.pPml4e->u)); - not always true with SMP guests. /
443	# endif
444	# if PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_GST_TYPE == PGM_TYPE_PAE
445	/AssertMsg(GstWalk.Pdpe.u == GstWalk.pPdpe->u, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pdpe.u, (uint64_t)GstWalk.pPdpe->u)); - ditto /
446	# endif
447	/AssertMsg(GstWalk.Pde.u == GstWalk.pPde->u, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pde.u, (uint64_t)GstWalk.pPde->u)); - ditto /
448	/AssertMsg(GstWalk.Core.fBigPage \|\| GstWalk.Pte.u == GstWalk.pPte->u, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pte.u, (uint64_t)GstWalk.pPte->u)); - ditto /
449	Assert(Walk.fSucceeded);
450	Assert(Walk.fEffective & PGM_PTATTRS_R_MASK);
451
452	if (uErr & (X86_TRAP_PF_RW \| X86_TRAP_PF_US \| X86_TRAP_PF_ID))
453	{
454	if ( ( (uErr & X86_TRAP_PF_RW)
455	&& !(Walk.fEffective & PGM_PTATTRS_W_MASK)
456	&& ( (uErr & X86_TRAP_PF_US)
457	\|\| CPUMIsGuestR0WriteProtEnabled(pVCpu)) )
458	\|\| ((uErr & X86_TRAP_PF_US) && !(Walk.fEffective & PGM_PTATTRS_US_MASK))
459	\|\| ((uErr & X86_TRAP_PF_ID) && (Walk.fEffective & PGM_PTATTRS_NX_MASK))
460	)
461	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerGuestFault)(pVCpu, &Walk, uErr));
462	}
463
464	/* Take the big lock now before we update flags. */
465	*pfLockTaken = true;
466	PGM_LOCK_VOID(pVM);
467
468	/*
469	* Set the accessed and dirty flags.
470	*/
471	/** @todo Should probably use cmpxchg logic here as we're potentially racing
472	* other CPUs in SMP configs. (the lock isn't enough, since we take it
473	* after walking and the page tables could be stale already) */
474	# if PGM_GST_TYPE == PGM_TYPE_AMD64
475	if (!(GstWalk.Pml4e.u & X86_PML4E_A))
476	{
477	GstWalk.Pml4e.u \|= X86_PML4E_A;
478	GST_ATOMIC_OR(&GstWalk.pPml4e->u, X86_PML4E_A);
479	}
480	if (!(GstWalk.Pdpe.u & X86_PDPE_A))
481	{
482	GstWalk.Pdpe.u \|= X86_PDPE_A;
483	GST_ATOMIC_OR(&GstWalk.pPdpe->u, X86_PDPE_A);
484	}
485	# endif
486	if (Walk.fBigPage)
487	{
488	Assert(GstWalk.Pde.u & X86_PDE_PS);
489	if (uErr & X86_TRAP_PF_RW)
490	{
491	if ((GstWalk.Pde.u & (X86_PDE4M_A \| X86_PDE4M_D)) != (X86_PDE4M_A \| X86_PDE4M_D))
492	{
493	GstWalk.Pde.u \|= X86_PDE4M_A \| X86_PDE4M_D;
494	GST_ATOMIC_OR(&GstWalk.pPde->u, X86_PDE4M_A \| X86_PDE4M_D);
495	}
496	}
497	else
498	{
499	if (!(GstWalk.Pde.u & X86_PDE4M_A))
500	{
501	GstWalk.Pde.u \|= X86_PDE4M_A;
502	GST_ATOMIC_OR(&GstWalk.pPde->u, X86_PDE4M_A);
503	}
504	}
505	}
506	else
507	{
508	Assert(!(GstWalk.Pde.u & X86_PDE_PS));
509	if (!(GstWalk.Pde.u & X86_PDE_A))
510	{
511	GstWalk.Pde.u \|= X86_PDE_A;
512	GST_ATOMIC_OR(&GstWalk.pPde->u, X86_PDE_A);
513	}
514
515	if (uErr & X86_TRAP_PF_RW)
516	{
517	# ifdef VBOX_WITH_STATISTICS
518	if (GstWalk.Pte.u & X86_PTE_D)
519	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageAlreadyDirty));
520	else
521	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtiedPage));
522	# endif
523	if ((GstWalk.Pte.u & (X86_PTE_A \| X86_PTE_D)) != (X86_PTE_A \| X86_PTE_D))
524	{
525	GstWalk.Pte.u \|= X86_PTE_A \| X86_PTE_D;
526	GST_ATOMIC_OR(&GstWalk.pPte->u, X86_PTE_A \| X86_PTE_D);
527	}
528	}
529	else
530	{
531	if (!(GstWalk.Pte.u & X86_PTE_A))
532	{
533	GstWalk.Pte.u \|= X86_PTE_A;
534	GST_ATOMIC_OR(&GstWalk.pPte->u, X86_PTE_A);
535	}
536	}
537	Assert(GstWalk.Pte.u == GstWalk.pPte->u);
538	}
539	#if 0
540	/* Disabling this since it's not reliable for SMP, see @bugref{10092#c22}. */
541	AssertMsg(GstWalk.Pde.u == GstWalk.pPde->u \|\| GstWalk.pPte->u == GstWalk.pPde->u,
542	("%RX64 %RX64 pPte=%p pPde=%p Pte=%RX64\n", (uint64_t)GstWalk.Pde.u, (uint64_t)GstWalk.pPde->u, GstWalk.pPte, GstWalk.pPde, (uint64_t)GstWalk.pPte->u));
543	#endif
544
545	# else /* !PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) */
546	GSTPDE const PdeSrcDummy = { X86_PDE_P \| X86_PDE_US \| X86_PDE_RW \| X86_PDE_A}; /** @todo eliminate this */
547
548	/* Take the big lock now. */
549	*pfLockTaken = true;
550	PGM_LOCK_VOID(pVM);
551	# endif /* !PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) */
552
553	# ifdef PGM_WITH_MMIO_OPTIMIZATIONS
554	/*
555	* If it is a reserved bit fault we know that it is an MMIO (access
556	* handler) related fault and can skip some 200 lines of code.
557	*/
558	if (uErr & X86_TRAP_PF_RSVD)
559	{
560	Assert(uErr & X86_TRAP_PF_P);
561	PPGMPAGE pPage;
562	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
563	rc = pgmPhysGetPageEx(pVM, Walk.GCPhys, &pPage);
564	if (RT_SUCCESS(rc) && PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
565	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerDoAccessHandlers)(pVCpu, uErr, pCtx, pvFault, pPage,
566	pfLockTaken, &Walk, &GstWalk));
567	rc = PGM_BTH_NAME(SyncPage)(pVCpu, GstWalk.Pde, pvFault, 1, uErr);
568	# else
569	rc = pgmPhysGetPageEx(pVM, PGM_A20_APPLY(pVCpu, (RTGCPHYS)pvFault), &pPage);
570	if (RT_SUCCESS(rc) && PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
571	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerDoAccessHandlers)(pVCpu, uErr, pCtx, pvFault, pPage, pfLockTaken));
572	rc = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, 1, uErr);
573	# endif
574	AssertRC(rc);
575	PGM_INVL_PG(pVCpu, pvFault);
576	return rc; /* Restart with the corrected entry. */
577	}
578	# endif /* PGM_WITH_MMIO_OPTIMIZATIONS */
579
580	/*
581	* Fetch the guest PDE, PDPE and PML4E.
582	*/
583	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
584	const unsigned iPDDst = pvFault >> SHW_PD_SHIFT;
585	PX86PD pPDDst = pgmShwGet32BitPDPtr(pVCpu);
586
587	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
588	const unsigned iPDDst = (pvFault >> SHW_PD_SHIFT) & SHW_PD_MASK; /* pPDDst index, not used with the pool. */
589	PX86PDPAE pPDDst;
590	# if PGM_GST_TYPE == PGM_TYPE_PAE
591	rc = pgmShwSyncPaePDPtr(pVCpu, pvFault, GstWalk.Pdpe.u, &pPDDst);
592	# else
593	rc = pgmShwSyncPaePDPtr(pVCpu, pvFault, X86_PDPE_P, &pPDDst); /* RW, US and A are reserved in PAE mode. */
594	# endif
595	AssertMsgReturn(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
596
597	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
598	const unsigned iPDDst = ((pvFault >> SHW_PD_SHIFT) & SHW_PD_MASK);
599	PX86PDPAE pPDDst;
600	# if PGM_GST_TYPE == PGM_TYPE_PROT /* (AMD-V nested paging) */
601	rc = pgmShwSyncLongModePDPtr(pVCpu, pvFault, X86_PML4E_P \| X86_PML4E_RW \| X86_PML4E_US \| X86_PML4E_A,
602	X86_PDPE_P \| X86_PDPE_RW \| X86_PDPE_US \| X86_PDPE_A, &pPDDst);
603	# else
604	rc = pgmShwSyncLongModePDPtr(pVCpu, pvFault, GstWalk.Pml4e.u, GstWalk.Pdpe.u, &pPDDst);
605	# endif
606	AssertMsgReturn(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
607
608	# elif PGM_SHW_TYPE == PGM_TYPE_EPT
609	const unsigned iPDDst = ((pvFault >> SHW_PD_SHIFT) & SHW_PD_MASK);
610	PEPTPD pPDDst;
611	rc = pgmShwGetEPTPDPtr(pVCpu, pvFault, NULL, &pPDDst);
612	AssertMsgReturn(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
613	# endif
614	Assert(pPDDst);
615
616	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
617	/*
618	* Dirty page handling.
619	*
620	* If we successfully correct the write protection fault due to dirty bit
621	* tracking, then return immediately.
622	*/
623	if (uErr & X86_TRAP_PF_RW) /* write fault? */
624	{
625	STAM_PROFILE_START(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyBitTracking), a);
626	rc = PGM_BTH_NAME(CheckDirtyPageFault)(pVCpu, uErr, &pPDDst->a[iPDDst], GstWalk.pPde, pvFault);
627	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyBitTracking), a);
628	if (rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT)
629	{
630	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0
631	= rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT
632	? &pVCpu->pgm.s.Stats.StatRZTrap0eTime2DirtyAndAccessed
633	: &pVCpu->pgm.s.Stats.StatRZTrap0eTime2GuestTrap; });
634	Log8(("Trap0eHandler: returns VINF_SUCCESS\n"));
635	return VINF_SUCCESS;
636	}
637	#ifdef DEBUG_bird
638	AssertMsg(GstWalk.Pde.u == GstWalk.pPde->u \|\| GstWalk.pPte->u == GstWalk.pPde->u \|\| pVM->cCpus > 1, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pde.u, (uint64_t)GstWalk.pPde->u)); // - triggers with smp w7 guests.
639	AssertMsg(Walk.fBigPage \|\| GstWalk.Pte.u == GstWalk.pPte->u \|\| pVM->cCpus > 1, ("%RX64 %RX64\n", (uint64_t)GstWalk.Pte.u, (uint64_t)GstWalk.pPte->u)); // - ditto.
640	#endif
641	}
642
643	# if 0 /* rarely useful; leave for debugging. */
644	STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0ePD[iPDSrc]);
645	# endif
646	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) */
647
648	/*
649	* A common case is the not-present error caused by lazy page table syncing.
650	*
651	* It is IMPORTANT that we weed out any access to non-present shadow PDEs
652	* here so we can safely assume that the shadow PT is present when calling
653	* SyncPage later.
654	*
655	* On failure, we ASSUME that SyncPT is out of memory or detected some kind
656	* of mapping conflict and defer to SyncCR3 in R3.
657	* (Again, we do NOT support access handlers for non-present guest pages.)
658	*
659	*/
660	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
661	Assert(GstWalk.Pde.u & X86_PDE_P);
662	# endif
663	if ( !(uErr & X86_TRAP_PF_P) /* not set means page not present instead of page protection violation */
664	&& !SHW_PDE_IS_P(pPDDst->a[iPDDst]))
665	{
666	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2SyncPT; });
667	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
668	LogFlow(("=>SyncPT %04x = %08RX64\n", (pvFault >> GST_PD_SHIFT) & GST_PD_MASK, (uint64_t)GstWalk.Pde.u));
669	rc = PGM_BTH_NAME(SyncPT)(pVCpu, (pvFault >> GST_PD_SHIFT) & GST_PD_MASK, GstWalk.pPd, pvFault);
670	# else
671	LogFlow(("=>SyncPT pvFault=%RGv\n", pvFault));
672	rc = PGM_BTH_NAME(SyncPT)(pVCpu, 0, NULL, pvFault);
673	# endif
674	if (RT_SUCCESS(rc))
675	return rc;
676	Log(("SyncPT: %RGv failed!! rc=%Rrc\n", pvFault, rc));
677	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */
678	return VINF_PGM_SYNC_CR3;
679	}
680
681	/*
682	* Check if this fault address is flagged for special treatment,
683	* which means we'll have to figure out the physical address and
684	* check flags associated with it.
685	*
686	* ASSUME that we can limit any special access handling to pages
687	* in page tables which the guest believes to be present.
688	*/
689	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
690	RTGCPHYS GCPhys = Walk.GCPhys & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK;
691	# else
692	RTGCPHYS GCPhys = PGM_A20_APPLY(pVCpu, (RTGCPHYS)pvFault & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK);
693	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) */
694	PPGMPAGE pPage;
695	rc = pgmPhysGetPageEx(pVM, GCPhys, &pPage);
696	if (RT_FAILURE(rc))
697	{
698	/*
699	* When the guest accesses invalid physical memory (e.g. probing
700	* of RAM or accessing a remapped MMIO range), then we'll fall
701	* back to the recompiler to emulate the instruction.
702	*/
703	LogFlow(("PGM #PF: pgmPhysGetPageEx(%RGp) failed with %Rrc\n", GCPhys, rc));
704	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersInvalid);
705	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2InvalidPhys; });
706	return VINF_EM_RAW_EMULATE_INSTR;
707	}
708
709	/*
710	* Any handlers for this page?
711	*/
712	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) && !PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
713	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
714	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerDoAccessHandlers)(pVCpu, uErr, pCtx, pvFault, pPage, pfLockTaken,
715	&Walk, &GstWalk));
716	# else
717	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(Trap0eHandlerDoAccessHandlers)(pVCpu, uErr, pCtx, pvFault, pPage, pfLockTaken));
718	# endif
719
720	/*
721	* We are here only if page is present in Guest page tables and
722	* trap is not handled by our handlers.
723	*
724	* Check it for page out-of-sync situation.
725	*/
726	if (!(uErr & X86_TRAP_PF_P))
727	{
728	/*
729	* Page is not present in our page tables. Try to sync it!
730	*/
731	if (uErr & X86_TRAP_PF_US)
732	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncUser));
733	else /* supervisor */
734	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncSupervisor));
735
736	if (PGM_PAGE_IS_BALLOONED(pPage))
737	{
738	/* Emulate reads from ballooned pages as they are not present in
739	our shadow page tables. (Required for e.g. Solaris guests; soft
740	ecc, random nr generator.) */
741	rc = VBOXSTRICTRC_TODO(PGMInterpretInstruction(pVCpu, pvFault));
742	LogFlow(("PGM: PGMInterpretInstruction balloon -> rc=%d pPage=%R[pgmpage]\n", rc, pPage));
743	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncBallloon));
744	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2Ballooned; });
745	return rc;
746	}
747
748	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
749	rc = PGM_BTH_NAME(SyncPage)(pVCpu, GstWalk.Pde, pvFault, PGM_SYNC_NR_PAGES, uErr);
750	# else
751	rc = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, PGM_SYNC_NR_PAGES, uErr);
752	# endif
753	if (RT_SUCCESS(rc))
754	{
755	/* The page was successfully synced, return to the guest. */
756	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSync; });
757	return VINF_SUCCESS;
758	}
759	}
760	else /* uErr & X86_TRAP_PF_P: */
761	{
762	/*
763	* Write protected pages are made writable when the guest makes the
764	* first write to it. This happens for pages that are shared, write
765	* monitored or not yet allocated.
766	*
767	* We may also end up here when CR0.WP=0 in the guest.
768	*
769	* Also, a side effect of not flushing global PDEs are out of sync
770	* pages due to physical monitored regions, that are no longer valid.
771	* Assume for now it only applies to the read/write flag.
772	*/
773	if (uErr & X86_TRAP_PF_RW)
774	{
775	/*
776	* Check if it is a read-only page.
777	*/
778	if (PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED)
779	{
780	Log(("PGM #PF: Make writable: %RGp %R[pgmpage] pvFault=%RGp uErr=%#x\n", GCPhys, pPage, pvFault, uErr));
781	Assert(!PGM_PAGE_IS_ZERO(pPage));
782	AssertFatalMsg(!PGM_PAGE_IS_BALLOONED(pPage), ("Unexpected ballooned page at %RGp\n", GCPhys));
783	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2MakeWritable; });
784
785	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhys);
786	if (rc != VINF_SUCCESS)
787	{
788	AssertMsg(rc == VINF_PGM_SYNC_CR3 \|\| RT_FAILURE(rc), ("%Rrc\n", rc));
789	return rc;
790	}
791	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
792	return VINF_EM_NO_MEMORY;
793	}
794
795	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
796	/*
797	* Check to see if we need to emulate the instruction if CR0.WP=0.
798	*/
799	if ( !(Walk.fEffective & PGM_PTATTRS_W_MASK)
800	&& (CPUMGetGuestCR0(pVCpu) & (X86_CR0_WP \| X86_CR0_PG)) == X86_CR0_PG
801	&& CPUMGetGuestCPL(pVCpu) < 3)
802	{
803	Assert((uErr & (X86_TRAP_PF_RW \| X86_TRAP_PF_P)) == (X86_TRAP_PF_RW \| X86_TRAP_PF_P));
804
805	/*
806	* The Netware WP0+RO+US hack.
807	*
808	* Netware sometimes(/always?) runs with WP0. It has been observed doing
809	* excessive write accesses to pages which are mapped with US=1 and RW=0
810	* while WP=0. This causes a lot of exits and extremely slow execution.
811	* To avoid trapping and emulating every write here, we change the shadow
812	* page table entry to map it as US=0 and RW=1 until user mode tries to
813	* access it again (see further below). We count these shadow page table
814	* changes so we can avoid having to clear the page pool every time the WP
815	* bit changes to 1 (see PGMCr0WpEnabled()).
816	*/
817	# if (PGM_GST_TYPE == PGM_TYPE_32BIT \|\| PGM_GST_TYPE == PGM_TYPE_PAE) && 1
818	if ( (Walk.fEffective & (PGM_PTATTRS_W_MASK \| PGM_PTATTRS_US_MASK)) == PGM_PTATTRS_US_MASK
819	&& (Walk.fBigPage \|\| (GstWalk.Pde.u & X86_PDE_RW))
820	&& pVM->cCpus == 1 /* Sorry, no go on SMP. Add CFGM option? */)
821	{
822	Log(("PGM #PF: Netware WP0+RO+US hack: pvFault=%RGp uErr=%#x (big=%d)\n", pvFault, uErr, Walk.fBigPage));
823	rc = pgmShwMakePageSupervisorAndWritable(pVCpu, pvFault, Walk.fBigPage, PGM_MK_PG_IS_WRITE_FAULT);
824	if (rc == VINF_SUCCESS \|\| rc == VINF_PGM_SYNC_CR3)
825	{
826	PGM_INVL_PG(pVCpu, pvFault);
827	pVCpu->pgm.s.cNetwareWp0Hacks++;
828	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2Wp0RoUsHack; });
829	return rc;
830	}
831	AssertMsg(RT_FAILURE_NP(rc), ("%Rrc\n", rc));
832	Log(("pgmShwMakePageSupervisorAndWritable(%RGv) failed with rc=%Rrc - ignored\n", pvFault, rc));
833	}
834	# endif
835
836	/* Interpret the access. */
837	rc = VBOXSTRICTRC_TODO(PGMInterpretInstruction(pVCpu, pvFault));
838	Log(("PGM #PF: WP0 emulation (pvFault=%RGp uErr=%#x cpl=%d fBig=%d fEffUs=%d)\n", pvFault, uErr, CPUMGetGuestCPL(pVCpu), Walk.fBigPage, !!(Walk.fEffective & PGM_PTATTRS_US_MASK)));
839	if (RT_SUCCESS(rc))
840	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eWPEmulInRZ);
841	else
842	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eWPEmulToR3);
843	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2WPEmulation; });
844	return rc;
845	}
846	# endif
847	/// @todo count the above case; else
848	if (uErr & X86_TRAP_PF_US)
849	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncUserWrite));
850	else /* supervisor */
851	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncSupervisorWrite));
852
853	/*
854	* Sync the page.
855	*
856	* Note: Do NOT use PGM_SYNC_NR_PAGES here. That only works if the
857	* page is not present, which is not true in this case.
858	*/
859	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
860	rc = PGM_BTH_NAME(SyncPage)(pVCpu, GstWalk.Pde, pvFault, 1, uErr);
861	# else
862	rc = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrcDummy, pvFault, 1, uErr);
863	# endif
864	if (RT_SUCCESS(rc))
865	{
866	/*
867	* Page was successfully synced, return to guest but invalidate
868	* the TLB first as the page is very likely to be in it.
869	*/
870	# if PGM_SHW_TYPE == PGM_TYPE_EPT
871	HMInvalidatePhysPage(pVM, (RTGCPHYS)pvFault);
872	# else
873	PGM_INVL_PG(pVCpu, pvFault);
874	# endif
875	# ifdef VBOX_STRICT
876	PGMPTWALK GstPageWalk;
877	GstPageWalk.GCPhys = RTGCPHYS_MAX;
878	if (!pVM->pgm.s.fNestedPaging)
879	{
880	rc = PGMGstGetPage(pVCpu, pvFault, &GstPageWalk);
881	AssertMsg(RT_SUCCESS(rc) && ((GstPageWalk.fEffective & X86_PTE_RW) \|\| ((CPUMGetGuestCR0(pVCpu) & (X86_CR0_WP \| X86_CR0_PG)) == X86_CR0_PG && CPUMGetGuestCPL(pVCpu) < 3)), ("rc=%Rrc fPageGst=%RX64\n", rc, GstPageWalk.fEffective));
882	LogFlow(("Obsolete physical monitor page out of sync %RGv - phys %RGp flags=%08llx\n", pvFault, GstPageWalk.GCPhys, GstPageWalk.fEffective));
883	}
884	# if 0 /* Bogus! Triggers incorrectly with w7-64 and later for the SyncPage case: "Pde at %RGv changed behind our back?" */
885	uint64_t fPageShw = 0;
886	rc = PGMShwGetPage(pVCpu, pvFault, &fPageShw, NULL);
887	AssertMsg((RT_SUCCESS(rc) && (fPageShw & X86_PTE_RW)) \|\| pVM->cCpus > 1 /* new monitor can be installed/page table flushed between the trap exit and PGMTrap0eHandler */,
888	("rc=%Rrc fPageShw=%RX64 GCPhys2=%RGp fPageGst=%RX64 pvFault=%RGv\n", rc, fPageShw, GstPageWalk.GCPhys, fPageGst, pvFault));
889	# endif
890	# endif /* VBOX_STRICT */
891	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndObs; });
892	return VINF_SUCCESS;
893	}
894	}
895	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
896	/*
897	* Check for Netware WP0+RO+US hack from above and undo it when user
898	* mode accesses the page again.
899	*/
900	else if ( (Walk.fEffective & (PGM_PTATTRS_W_MASK \| PGM_PTATTRS_US_MASK)) == PGM_PTATTRS_US_MASK
901	&& (Walk.fBigPage \|\| (GstWalk.Pde.u & X86_PDE_RW))
902	&& pVCpu->pgm.s.cNetwareWp0Hacks > 0
903	&& (CPUMGetGuestCR0(pVCpu) & (X86_CR0_WP \| X86_CR0_PG)) == X86_CR0_PG
904	&& CPUMGetGuestCPL(pVCpu) == 3
905	&& pVM->cCpus == 1
906	)
907	{
908	Log(("PGM #PF: Undo netware WP0+RO+US hack: pvFault=%RGp uErr=%#x\n", pvFault, uErr));
909	rc = PGM_BTH_NAME(SyncPage)(pVCpu, GstWalk.Pde, pvFault, 1, uErr);
910	if (RT_SUCCESS(rc))
911	{
912	PGM_INVL_PG(pVCpu, pvFault);
913	pVCpu->pgm.s.cNetwareWp0Hacks--;
914	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2Wp0RoUsUnhack; });
915	return VINF_SUCCESS;
916	}
917	}
918	# endif /* PGM_WITH_PAGING */
919
920	/** @todo else: why are we here? */
921
922	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) && defined(VBOX_STRICT)
923	/*
924	* Check for VMM page flags vs. Guest page flags consistency.
925	* Currently only for debug purposes.
926	*/
927	if (RT_SUCCESS(rc))
928	{
929	/* Get guest page flags. */
930	PGMPTWALK GstPageWalk;
931	int rc2 = PGMGstGetPage(pVCpu, pvFault, &GstPageWalk);
932	if (RT_SUCCESS(rc2))
933	{
934	uint64_t fPageShw = 0;
935	rc2 = PGMShwGetPage(pVCpu, pvFault, &fPageShw, NULL);
936
937	#if 0
938	/*
939	* Compare page flags.
940	* Note: we have AVL, A, D bits desynced.
941	*/
942	AssertMsg( (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK))
943	== (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK))
944	\|\| ( pVCpu->pgm.s.cNetwareWp0Hacks > 0
945	&& (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US))
946	== (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US))
947	&& (fPageShw & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_RW
948	&& (fPageGst & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_US),
949	("Page flags mismatch! pvFault=%RGv uErr=%x GCPhys=%RGp fPageShw=%RX64 fPageGst=%RX64 rc=%d\n",
950	pvFault, (uint32_t)uErr, GCPhys, fPageShw, fPageGst, rc));
951	01:01:15.623511 00:08:43.266063 Expression: (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)) == (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)) \|\| ( pVCpu->pgm.s.cNetwareWp0Hacks > 0 && (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US)) == (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US)) && (fPageShw & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_RW && (fPageGst & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_US)
952	01:01:15.623511 00:08:43.266064 Location : e:\vbox\svn\trunk\srcPage flags mismatch! pvFault=fffff801b0d7b000 uErr=11 GCPhys=0000000019b52000 fPageShw=0 fPageGst=77b0000000000121 rc=0
953
954	01:01:15.625516 00:08:43.268051 Expression: (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)) == (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK)) \|\| ( pVCpu->pgm.s.cNetwareWp0Hacks > 0 && (fPageShw & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US)) == (fPageGst & ~(X86_PTE_A \| X86_PTE_D \| X86_PTE_AVL_MASK \| X86_PTE_RW \| X86_PTE_US)) && (fPageShw & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_RW && (fPageGst & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_US)
955	01:01:15.625516 00:08:43.268051 Location :
956	e:\vbox\svn\trunk\srcPage flags mismatch!
957	pvFault=fffff801b0d7b000
958	uErr=11 X86_TRAP_PF_ID \| X86_TRAP_PF_P
959	GCPhys=0000000019b52000
960	fPageShw=0
961	fPageGst=77b0000000000121
962	rc=0
963	#endif
964
965	}
966	else
967	AssertMsgFailed(("PGMGstGetPage rc=%Rrc\n", rc));
968	}
969	else
970	AssertMsgFailed(("PGMGCGetPage rc=%Rrc\n", rc));
971	# endif /* PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) && VBOX_STRICT */
972	}
973
974
975	/*
976	* If we get here it is because something failed above, i.e. most like guru
977	* meditiation time.
978	*/
979	LogRel(("%s: returns rc=%Rrc pvFault=%RGv uErr=%RX64 cs:rip=%04x:%08RX64\n",
980	__PRETTY_FUNCTION__, rc, pvFault, (uint64_t)uErr, pCtx->cs.Sel, pCtx->rip));
981	return rc;
982
983	# else /* Nested paging, EPT except PGM_GST_TYPE = PROT, NONE. */
984	NOREF(uErr); NOREF(pCtx); NOREF(pvFault);
985	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE));
986	return VERR_PGM_NOT_USED_IN_MODE;
987	# endif
988	}
989
990
991	# if defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT)
992	/**
993	* Deals with a nested-guest \#PF fault for a guest-physical page with a handler.
994	*
995	* @returns Strict VBox status code.
996	* @param pVCpu The cross context virtual CPU structure.
997	* @param uErr The error code.
998	* @param pCtx Pointer to the register context for the CPU.
999	* @param GCPhysNestedFault The nested-guest physical address of the fault.
1000	* @param pPage The guest page at @a GCPhysNestedFault.
1001	* @param GCPhysFault The guest-physical address of the fault.
1002	* @param pGstWalkAll The guest page walk result.
1003	* @param pfLockTaken Where to store whether the PGM is still held when
1004	* this function completes.
1005	*
1006	* @note The caller has taken the PGM lock.
1007	*/
1008	static VBOXSTRICTRC PGM_BTH_NAME(NestedTrap0eHandlerDoAccessHandlers)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx,
1009	RTGCPHYS GCPhysNestedFault, PPGMPAGE pPage,
1010	RTGCPHYS GCPhysFault, PPGMPTWALKGST pGstWalkAll,
1011	bool *pfLockTaken)
1012	{
1013	# if PGM_GST_TYPE == PGM_TYPE_PROT \
1014	&& PGM_SHW_TYPE == PGM_TYPE_EPT
1015
1016	/** @todo Assert uErr isn't X86_TRAP_PF_RSVD and remove release checks. */
1017	PGM_A20_ASSERT_MASKED(pVCpu, GCPhysFault);
1018	AssertMsgReturn(PGM_PAGE_HAS_ANY_PHYSICAL_HANDLERS(pPage), ("%RGp %RGp uErr=%u\n", GCPhysNestedFault, GCPhysFault, uErr),
1019	VERR_PGM_HANDLER_IPE_1);
1020
1021	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1022	RTGCPHYS const GCPhysNestedPage = GCPhysNestedFault & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK;
1023	RTGCPHYS const GCPhysPage = GCPhysFault & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK;
1024
1025	/*
1026	* Physical page access handler.
1027	*/
1028	PPGMPHYSHANDLER pCur;
1029	VBOXSTRICTRC rcStrict = pgmHandlerPhysicalLookup(pVM, GCPhysPage, &pCur);
1030	AssertRCReturn(VBOXSTRICTRC_VAL(rcStrict), rcStrict);
1031
1032	PCPGMPHYSHANDLERTYPEINT const pCurType = PGMPHYSHANDLER_GET_TYPE(pVM, pCur);
1033	Assert(pCurType);
1034
1035	/*
1036	* If the region is write protected and we got a page not present fault, then sync
1037	* the pages. If the fault was caused by a read, then restart the instruction.
1038	* In case of write access continue to the GC write handler.
1039	*/
1040	if ( !(uErr & X86_TRAP_PF_P)
1041	&& pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE)
1042	{
1043	Log7Func(("Syncing Monitored: GCPhysNestedPage=%RGp GCPhysPage=%RGp uErr=%#x\n", GCPhysNestedPage, GCPhysPage, uErr));
1044	rcStrict = PGM_BTH_NAME(NestedSyncPage)(pVCpu, GCPhysNestedPage, GCPhysPage, 1 /cPages/, uErr, pGstWalkAll);
1045	Assert(rcStrict != VINF_PGM_SYNCPAGE_MODIFIED_PDE);
1046	if ( RT_FAILURE(rcStrict)
1047	\|\| !(uErr & X86_TRAP_PF_RW))
1048	{
1049	AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
1050	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersOutOfSync);
1051	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndPhys; });
1052	return rcStrict;
1053	}
1054	}
1055	else if ( !(uErr & X86_TRAP_PF_RSVD)
1056	&& pCurType->enmKind != PGMPHYSHANDLERKIND_WRITE)
1057	{
1058	/*
1059	* If the access was NOT through an EPT misconfig (i.e. RSVD), sync the page.
1060	* This can happen for the VMX APIC-access page.
1061	*/
1062	Log7Func(("Syncing MMIO: GCPhysNestedPage=%RGp GCPhysPage=%RGp\n", GCPhysNestedPage, GCPhysPage));
1063	rcStrict = PGM_BTH_NAME(NestedSyncPage)(pVCpu, GCPhysNestedPage, GCPhysPage, 1 /cPages/, uErr, pGstWalkAll);
1064	Assert(rcStrict != VINF_PGM_SYNCPAGE_MODIFIED_PDE);
1065	if (RT_FAILURE(rcStrict))
1066	{
1067	AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
1068	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersOutOfSync);
1069	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndPhys; });
1070	return rcStrict;
1071	}
1072	}
1073
1074	AssertMsg( pCurType->enmKind != PGMPHYSHANDLERKIND_WRITE
1075	\|\| (pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE && (uErr & X86_TRAP_PF_RW)),
1076	("Unexpected trap for physical handler: %08X (phys=%08x) pPage=%R[pgmpage] uErr=%X, enmKind=%d\n",
1077	GCPhysNestedFault, GCPhysFault, pPage, uErr, pCurType->enmKind));
1078	if (pCurType->enmKind == PGMPHYSHANDLERKIND_WRITE)
1079	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysWrite);
1080	else
1081	{
1082	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysAll);
1083	if (uErr & X86_TRAP_PF_RSVD)
1084	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersPhysAllOpt);
1085	}
1086
1087	if (pCurType->pfnPfHandler)
1088	{
1089	STAM_PROFILE_START(&pCur->Stat, h);
1090	uint64_t const uUser = !pCurType->fRing0DevInsIdx ? pCur->uUser
1091	: (uintptr_t)PDMDeviceRing0IdxToInstance(pVM, pCur->uUser);
1092
1093	if (pCurType->fKeepPgmLock)
1094	{
1095	rcStrict = pCurType->pfnPfHandler(pVM, pVCpu, uErr, pCtx, GCPhysNestedFault, GCPhysFault, uUser);
1096	STAM_PROFILE_STOP(&pCur->Stat, h);
1097	}
1098	else
1099	{
1100	PGM_UNLOCK(pVM);
1101	*pfLockTaken = false;
1102	rcStrict = pCurType->pfnPfHandler(pVM, pVCpu, uErr, pCtx, GCPhysNestedFault, GCPhysFault, uUser);
1103	STAM_PROFILE_STOP(&pCur->Stat, h); /* no locking needed, entry is unlikely reused before we get here. */
1104	}
1105	}
1106	else
1107	{
1108	AssertMsgFailed(("What's going on here!? Fault falls outside handler range!?\n"));
1109	rcStrict = VINF_EM_RAW_EMULATE_INSTR;
1110	}
1111
1112	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2HndPhys; });
1113	return rcStrict;
1114
1115	# else
1116	RT_NOREF8(pVCpu, uErr, pCtx, GCPhysNestedFault, pPage, GCPhysFault, pGstWalkAll, pfLockTaken);
1117	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE));
1118	return VERR_PGM_NOT_USED_IN_MODE;
1119	# endif
1120	}
1121	# endif /* VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
1122
1123
1124	/**
1125	* Nested \#PF handler for nested-guest hardware-assisted execution using nested
1126	* paging.
1127	*
1128	* @returns VBox status code (appropriate for trap handling and GC return).
1129	* @param pVCpu The cross context virtual CPU structure.
1130	* @param uErr The fault error (X86_TRAP_PF_*).
1131	* @param pCtx Pointer to the register context for the CPU.
1132	* @param GCPhysNestedFault The nested-guest physical address of the fault.
1133	* @param fIsLinearAddrValid Whether translation of a nested-guest linear address
1134	* caused this fault. If @c false, GCPtrNestedFault
1135	* must be 0.
1136	* @param GCPtrNestedFault The nested-guest linear address of this fault.
1137	* @param pWalk The guest page table walk result.
1138	* @param pfLockTaken Where to store whether the PGM lock is still held
1139	* when this function completes.
1140	*/
1141	PGM_BTH_DECL(int, NestedTrap0eHandler)(PVMCPUCC pVCpu, RTGCUINT uErr, PCPUMCTX pCtx, RTGCPHYS GCPhysNestedFault,
1142	bool fIsLinearAddrValid, RTGCPTR GCPtrNestedFault, PPGMPTWALK pWalk, bool *pfLockTaken)
1143	{
1144	*pfLockTaken = false;
1145	# if defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT) \
1146	&& PGM_GST_TYPE == PGM_TYPE_PROT \
1147	&& PGM_SHW_TYPE == PGM_TYPE_EPT
1148
1149	Assert(CPUMIsGuestVmxEptPagingEnabled(pVCpu));
1150	Assert(PGM_A20_IS_ENABLED(pVCpu));
1151
1152	/* We don't support mode-based execute control for EPT yet. */
1153	Assert(!pVCpu->CTX_SUFF(pVM)->cpum.ro.GuestFeatures.fVmxModeBasedExecuteEpt);
1154	Assert(!(uErr & X86_TRAP_PF_US));
1155
1156	/* Take the big lock now. */
1157	*pfLockTaken = true;
1158	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1159	PGM_LOCK_VOID(pVM);
1160
1161	/*
1162	* Walk the guest EPT tables and check if it's an EPT violation or misconfiguration.
1163	*/
1164	if (fIsLinearAddrValid)
1165	Log7Func(("cs:rip=%04x:%#08RX64 GCPhysNestedFault=%RGp uErr=%#x GCPtrNestedFault=%RGv\n",
1166	pCtx->cs.Sel, pCtx->rip, GCPhysNestedFault, uErr, GCPtrNestedFault));
1167	else
1168	Log7Func(("cs:rip=%04x:%#08RX64 GCPhysNestedFault=%RGp uErr=%#x\n",
1169	pCtx->cs.Sel, pCtx->rip, GCPhysNestedFault, uErr));
1170	PGMPTWALKGST GstWalkAll;
1171	int rc = pgmGstSlatWalk(pVCpu, GCPhysNestedFault, fIsLinearAddrValid, GCPtrNestedFault, pWalk, &GstWalkAll);
1172	if (RT_FAILURE(rc))
1173	return rc;
1174
1175	Assert(GstWalkAll.enmType == PGMPTWALKGSTTYPE_EPT);
1176	Assert(pWalk->fSucceeded);
1177	Assert(pWalk->fEffective & (PGM_PTATTRS_EPT_R_MASK \| PGM_PTATTRS_EPT_W_MASK \| PGM_PTATTRS_EPT_X_SUPER_MASK));
1178	Assert(pWalk->fIsSlat);
1179
1180	# ifdef DEBUG_ramshankar
1181	/* Paranoia. */
1182	Assert(RT_BOOL(pWalk->fEffective & PGM_PTATTRS_R_MASK) == RT_BOOL(pWalk->fEffective & PGM_PTATTRS_EPT_R_MASK));
1183	Assert(RT_BOOL(pWalk->fEffective & PGM_PTATTRS_W_MASK) == RT_BOOL(pWalk->fEffective & PGM_PTATTRS_EPT_W_MASK));
1184	Assert(RT_BOOL(pWalk->fEffective & PGM_PTATTRS_NX_MASK) == !RT_BOOL(pWalk->fEffective & PGM_PTATTRS_EPT_X_SUPER_MASK));
1185	# endif
1186
1187	Log7Func(("SLAT: GCPhysNestedFault=%RGp -> GCPhys=%#RGp\n", GCPhysNestedFault, pWalk->GCPhys));
1188
1189	/*
1190	* Check page-access permissions.
1191	*/
1192	if ( ((uErr & X86_TRAP_PF_RW) && !(pWalk->fEffective & PGM_PTATTRS_W_MASK))
1193	\|\| ((uErr & X86_TRAP_PF_ID) && (pWalk->fEffective & PGM_PTATTRS_NX_MASK)))
1194	{
1195	Log7Func(("Permission failed! GCPtrNested=%RGv GCPhysNested=%RGp uErr=%#x fEffective=%#RX64\n", GCPtrNestedFault,
1196	GCPhysNestedFault, uErr, pWalk->fEffective));
1197	pWalk->fFailed = PGM_WALKFAIL_EPT_VIOLATION;
1198	return VERR_ACCESS_DENIED;
1199	}
1200
1201	PGM_A20_ASSERT_MASKED(pVCpu, pWalk->GCPhys);
1202	RTGCPHYS const GCPhysPage = pWalk->GCPhys & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK;
1203	RTGCPHYS const GCPhysNestedPage = GCPhysNestedFault & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK;
1204
1205	/*
1206	* If we were called via an EPT misconfig, it should've already resulted in a nested-guest VM-exit.
1207	*/
1208	AssertMsgReturn(!(uErr & X86_TRAP_PF_RSVD),
1209	("Unexpected EPT misconfig VM-exit. GCPhysPage=%RGp GCPhysNestedPage=%RGp\n", GCPhysPage, GCPhysNestedPage),
1210	VERR_PGM_MAPPING_IPE);
1211
1212	/*
1213	* Fetch and sync the nested-guest EPT page directory pointer.
1214	*/
1215	PEPTPD pEptPd;
1216	rc = pgmShwGetNestedEPTPDPtr(pVCpu, GCPhysNestedPage, NULL /ppPdpt/, &pEptPd, &GstWalkAll);
1217	AssertRCReturn(rc, rc);
1218	Assert(pEptPd);
1219
1220	/*
1221	* A common case is the not-present error caused by lazy page table syncing.
1222	*
1223	* It is IMPORTANT that we weed out any access to non-present shadow PDEs
1224	* here so we can safely assume that the shadow PT is present when calling
1225	* NestedSyncPage later.
1226	*
1227	* NOTE: It's possible we will be syncing the VMX APIC-access page here.
1228	* In that case, we would sync the page but will NOT go ahead with emulating
1229	* the APIC-access VM-exit through IEM. However, once the page is mapped in
1230	* the shadow tables, subsequent APIC-access VM-exits for the nested-guest
1231	* will be triggered by hardware. Maybe calling the IEM #PF handler can be
1232	* considered as an optimization later.
1233	*/
1234	unsigned const iPde = (GCPhysNestedPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
1235	if ( !(uErr & X86_TRAP_PF_P)
1236	&& !(pEptPd->a[iPde].u & EPT_PRESENT_MASK))
1237	{
1238	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2SyncPT; });
1239	Log7Func(("NestedSyncPT: Lazy. GCPhysNestedPage=%RGp GCPhysPage=%RGp\n", GCPhysNestedPage, GCPhysPage));
1240	rc = PGM_BTH_NAME(NestedSyncPT)(pVCpu, GCPhysNestedPage, GCPhysPage, &GstWalkAll);
1241	if (RT_SUCCESS(rc))
1242	return rc;
1243	AssertMsgFailedReturn(("NestedSyncPT: %RGv failed! rc=%Rrc\n", GCPhysNestedPage, rc), VERR_PGM_MAPPING_IPE);
1244	}
1245
1246	/*
1247	* Check if this fault address is flagged for special treatment.
1248	* This handles faults on an MMIO or write-monitored page.
1249	*
1250	* If this happens to be the VMX APIC-access page, we don't treat is as MMIO
1251	* but rather sync it further below (as a regular guest page) which lets
1252	* hardware-assisted execution trigger the APIC-access VM-exits of the
1253	* nested-guest directly.
1254	*/
1255	PPGMPAGE pPage;
1256	rc = pgmPhysGetPageEx(pVM, GCPhysPage, &pPage);
1257	if (RT_FAILURE(rc))
1258	{
1259	/*
1260	* We failed to get the physical page which means it's a reserved/invalid
1261	* page address (not MMIO even). This can typically be observed with
1262	* Microsoft Hyper-V enabled Windows guests. We must fall back to emulating
1263	* the instruction, see @bugref{10318#c7}.
1264	*/
1265	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.StatRZTrap0eHandlersInvalid);
1266	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2InvalidPhys; });
1267	return VINF_EM_RAW_EMULATE_INSTR;
1268	}
1269	/* Check if this is an MMIO page and NOT the VMX APIC-access page. */
1270	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) && !PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
1271	{
1272	Log7Func(("MMIO: Calling NestedTrap0eHandlerDoAccessHandlers for GCPhys %RGp\n", GCPhysPage));
1273	return VBOXSTRICTRC_TODO(PGM_BTH_NAME(NestedTrap0eHandlerDoAccessHandlers)(pVCpu, uErr, pCtx, GCPhysNestedFault,
1274	pPage, pWalk->GCPhys, &GstWalkAll,
1275	pfLockTaken));
1276	}
1277
1278	/*
1279	* We are here only if page is present in nested-guest page tables but the
1280	* trap is not handled by our handlers. Check for page out-of-sync situation.
1281	*/
1282	if (!(uErr & X86_TRAP_PF_P))
1283	{
1284	Assert(!PGM_PAGE_IS_BALLOONED(pPage));
1285	Assert(!(uErr & X86_TRAP_PF_US)); /* Mode-based execute not supported yet. */
1286	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncSupervisor));
1287
1288	Log7Func(("SyncPage: Not-Present: GCPhysNestedPage=%RGp GCPhysPage=%RGp\n", GCPhysNestedFault, GCPhysPage));
1289	rc = PGM_BTH_NAME(NestedSyncPage)(pVCpu, GCPhysNestedPage, GCPhysPage, PGM_SYNC_NR_PAGES, uErr, &GstWalkAll);
1290	if (RT_SUCCESS(rc))
1291	{
1292	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSync; });
1293	return VINF_SUCCESS;
1294	}
1295	}
1296	else if (uErr & X86_TRAP_PF_RW)
1297	{
1298	/*
1299	* Write protected pages are made writable when the guest makes the
1300	* first write to it. This happens for pages that are shared, write
1301	* monitored or not yet allocated.
1302	*
1303	* We may also end up here when CR0.WP=0 in the guest.
1304	*
1305	* Also, a side effect of not flushing global PDEs are out of sync
1306	* pages due to physical monitored regions, that are no longer valid.
1307	* Assume for now it only applies to the read/write flag.
1308	*/
1309	if (PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED)
1310	{
1311	/* This is a read-only page. */
1312	AssertFatalMsg(!PGM_PAGE_IS_BALLOONED(pPage), ("Unexpected ballooned page at %RGp\n", GCPhysPage));
1313	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2MakeWritable; });
1314
1315	Log7Func(("Calling pgmPhysPageMakeWritable for GCPhysPage=%RGp\n", GCPhysPage));
1316	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhysPage);
1317	if (rc != VINF_SUCCESS)
1318	{
1319	AssertMsg(rc == VINF_PGM_SYNC_CR3 \|\| RT_FAILURE(rc), ("%Rrc\n", rc));
1320	return rc;
1321	}
1322	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
1323	return VINF_EM_NO_MEMORY;
1324	}
1325
1326	Assert(!(uErr & X86_TRAP_PF_US)); /* Mode-based execute not supported yet. */
1327	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncSupervisorWrite));
1328
1329	/*
1330	* Sync the write-protected page.
1331	* Note: Do NOT use PGM_SYNC_NR_PAGES here. That only works if the
1332	* page is not present, which is not true in this case.
1333	*/
1334	Log7Func(("SyncPage: RW: cs:rip=%04x:%#RX64 GCPhysNestedPage=%RGp uErr=%#RX32 GCPhysPage=%RGp WalkGCPhys=%RGp\n",
1335	pCtx->cs.Sel, pCtx->rip, GCPhysNestedPage, (uint32_t)uErr, GCPhysPage, pWalk->GCPhys));
1336	rc = PGM_BTH_NAME(NestedSyncPage)(pVCpu, GCPhysNestedPage, GCPhysPage, 1 /* cPages */, uErr, &GstWalkAll);
1337	if (RT_SUCCESS(rc))
1338	{
1339	HMInvalidatePhysPage(pVM, GCPhysPage);
1340	STAM_STATS({ pVCpu->pgmr0.s.pStatTrap0eAttributionR0 = &pVCpu->pgm.s.Stats.StatRZTrap0eTime2OutOfSyncHndObs; });
1341	return VINF_SUCCESS;
1342	}
1343	}
1344
1345	/*
1346	* If we get here it is because something failed above => guru meditation time?
1347	*/
1348	LogRelMaxFunc(32, ("rc=%Rrc GCPhysNestedFault=%#RGp (%#RGp) uErr=%#RX32 cs:rip=%04x:%08RX64\n",
1349	rc, GCPhysNestedFault, GCPhysPage, (uint32_t)uErr, pCtx->cs.Sel, pCtx->rip));
1350	return VERR_PGM_MAPPING_IPE;
1351
1352	# else /* !VBOX_WITH_NESTED_HWVIRT_VMX_EPT \|\| PGM_GST_TYPE != PGM_TYPE_PROT \|\| PGM_SHW_TYPE != PGM_TYPE_EPT */
1353	RT_NOREF7(pVCpu, uErr, pCtx, GCPhysNestedFault, fIsLinearAddrValid, GCPtrNestedFault, pWalk);
1354	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE));
1355	return VERR_PGM_NOT_USED_IN_MODE;
1356	# endif
1357	}
1358
1359	#endif /* !IN_RING3 */
1360
1361
1362	/**
1363	* Emulation of the invlpg instruction.
1364	*
1365	*
1366	* @returns VBox status code.
1367	*
1368	* @param pVCpu The cross context virtual CPU structure.
1369	* @param GCPtrPage Page to invalidate.
1370	*
1371	* @remark ASSUMES that the guest is updating before invalidating. This order
1372	* isn't required by the CPU, so this is speculative and could cause
1373	* trouble.
1374	* @remark No TLB shootdown is done on any other VCPU as we assume that
1375	* invlpg emulation is the only reason for calling this function.
1376	* (The guest has to shoot down TLB entries on other CPUs itself)
1377	* Currently true, but keep in mind!
1378	*
1379	* @todo Clean this up! Most of it is (or should be) no longer necessary as we catch all page table accesses.
1380	* Should only be required when PGMPOOL_WITH_OPTIMIZED_DIRTY_PT is active (PAE or AMD64 (for now))
1381	*/
1382	PGM_BTH_DECL(int, InvalidatePage)(PVMCPUCC pVCpu, RTGCPTR GCPtrPage)
1383	{
1384	#if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) \
1385	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \
1386	&& PGM_SHW_TYPE != PGM_TYPE_NONE
1387	int rc;
1388	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1389	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1390
1391	PGM_LOCK_ASSERT_OWNER(pVM);
1392
1393	LogFlow(("InvalidatePage %RGv\n", GCPtrPage));
1394
1395	/*
1396	* Get the shadow PD entry and skip out if this PD isn't present.
1397	* (Guessing that it is frequent for a shadow PDE to not be present, do this first.)
1398	*/
1399	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
1400	const unsigned iPDDst = (uint32_t)GCPtrPage >> SHW_PD_SHIFT;
1401	PX86PDE pPdeDst = pgmShwGet32BitPDEPtr(pVCpu, GCPtrPage);
1402
1403	/* Fetch the pgm pool shadow descriptor. */
1404	PPGMPOOLPAGE pShwPde = pVCpu->pgm.s.CTX_SUFF(pShwPageCR3);
1405	# ifdef IN_RING3 /* Possible we didn't resync yet when called from REM. */
1406	if (!pShwPde)
1407	{
1408	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1409	return VINF_SUCCESS;
1410	}
1411	# else
1412	Assert(pShwPde);
1413	# endif
1414
1415	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
1416	const unsigned iPdpt = (uint32_t)GCPtrPage >> X86_PDPT_SHIFT;
1417	PX86PDPT pPdptDst = pgmShwGetPaePDPTPtr(pVCpu);
1418
1419	/* If the shadow PDPE isn't present, then skip the invalidate. */
1420	# ifdef IN_RING3 /* Possible we didn't resync yet when called from REM. */
1421	if (!pPdptDst \|\| !(pPdptDst->a[iPdpt].u & X86_PDPE_P))
1422	# else
1423	if (!(pPdptDst->a[iPdpt].u & X86_PDPE_P))
1424	# endif
1425	{
1426	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1427	PGM_INVL_PG(pVCpu, GCPtrPage);
1428	return VINF_SUCCESS;
1429	}
1430
1431	/* Fetch the pgm pool shadow descriptor. */
1432	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & X86_PDPE_PG_MASK);
1433	AssertReturn(pShwPde, VERR_PGM_POOL_GET_PAGE_FAILED);
1434
1435	PX86PDPAE pPDDst = (PX86PDPAE)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPde);
1436	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
1437	PX86PDEPAE pPdeDst = &pPDDst->a[iPDDst];
1438
1439	# else /* PGM_SHW_TYPE == PGM_TYPE_AMD64 */
1440	/* PML4 */
1441	/const unsigned iPml4 = (GCPtrPage >> X86_PML4_SHIFT) & X86_PML4_MASK;/
1442	const unsigned iPdpt = (GCPtrPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
1443	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
1444	PX86PDPAE pPDDst;
1445	PX86PDPT pPdptDst;
1446	PX86PML4E pPml4eDst;
1447	rc = pgmShwGetLongModePDPtr(pVCpu, GCPtrPage, &pPml4eDst, &pPdptDst, &pPDDst);
1448	if (rc != VINF_SUCCESS)
1449	{
1450	AssertMsg(rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT \|\| rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT, ("Unexpected rc=%Rrc\n", rc));
1451	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1452	PGM_INVL_PG(pVCpu, GCPtrPage);
1453	return VINF_SUCCESS;
1454	}
1455	PX86PDEPAE pPdeDst = &pPDDst->a[iPDDst];
1456	Assert(pPDDst);
1457	Assert(pPdptDst->a[iPdpt].u & X86_PDPE_P);
1458
1459	/* Fetch the pgm pool shadow descriptor. */
1460	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & SHW_PDPE_PG_MASK);
1461	Assert(pShwPde);
1462
1463	# endif /* PGM_SHW_TYPE == PGM_TYPE_AMD64 */
1464
1465	const SHWPDE PdeDst = *pPdeDst;
1466	if (!(PdeDst.u & X86_PDE_P))
1467	{
1468	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1469	PGM_INVL_PG(pVCpu, GCPtrPage);
1470	return VINF_SUCCESS;
1471	}
1472
1473	/*
1474	* Get the guest PD entry and calc big page.
1475	*/
1476	# if PGM_GST_TYPE == PGM_TYPE_32BIT
1477	PGSTPD pPDSrc = pgmGstGet32bitPDPtr(pVCpu);
1478	const unsigned iPDSrc = (uint32_t)GCPtrPage >> GST_PD_SHIFT;
1479	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
1480	# else /* PGM_GST_TYPE != PGM_TYPE_32BIT */
1481	unsigned iPDSrc = 0;
1482	# if PGM_GST_TYPE == PGM_TYPE_PAE
1483	X86PDPE PdpeSrcIgn;
1484	PX86PDPAE pPDSrc = pgmGstGetPaePDPtr(pVCpu, GCPtrPage, &iPDSrc, &PdpeSrcIgn);
1485	# else /* AMD64 */
1486	PX86PML4E pPml4eSrcIgn;
1487	X86PDPE PdpeSrcIgn;
1488	PX86PDPAE pPDSrc = pgmGstGetLongModePDPtr(pVCpu, GCPtrPage, &pPml4eSrcIgn, &PdpeSrcIgn, &iPDSrc);
1489	# endif
1490	GSTPDE PdeSrc;
1491
1492	if (pPDSrc)
1493	PdeSrc = pPDSrc->a[iPDSrc];
1494	else
1495	PdeSrc.u = 0;
1496	# endif /* PGM_GST_TYPE != PGM_TYPE_32BIT */
1497	const bool fWasBigPage = RT_BOOL(PdeDst.u & PGM_PDFLAGS_BIG_PAGE);
1498	const bool fIsBigPage = (PdeSrc.u & X86_PDE_PS) && GST_IS_PSE_ACTIVE(pVCpu);
1499	if (fWasBigPage != fIsBigPage)
1500	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1501
1502	# ifdef IN_RING3
1503	/*
1504	* If a CR3 Sync is pending we may ignore the invalidate page operation
1505	* depending on the kind of sync and if it's a global page or not.
1506	* This doesn't make sense in GC/R0 so we'll skip it entirely there.
1507	*/
1508	# ifdef PGM_SKIP_GLOBAL_PAGEDIRS_ON_NONGLOBAL_FLUSH
1509	if ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
1510	\|\| ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL)
1511	&& fIsBigPage
1512	&& (PdeSrc.u & X86_PDE4M_G)
1513	)
1514	)
1515	# else
1516	if (VM_FF_IS_ANY_SET(pVM, VM_FF_PGM_SYNC_CR3 \| VM_FF_PGM_SYNC_CR3_NON_GLOBAL) )
1517	# endif
1518	{
1519	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePageSkipped));
1520	return VINF_SUCCESS;
1521	}
1522	# endif /* IN_RING3 */
1523
1524	/*
1525	* Deal with the Guest PDE.
1526	*/
1527	rc = VINF_SUCCESS;
1528	if (PdeSrc.u & X86_PDE_P)
1529	{
1530	Assert( (PdeSrc.u & X86_PDE_US) == (PdeDst.u & X86_PDE_US)
1531	&& ((PdeSrc.u & X86_PDE_RW) \|\| !(PdeDst.u & X86_PDE_RW) \|\| pVCpu->pgm.s.cNetwareWp0Hacks > 0));
1532	if (!fIsBigPage)
1533	{
1534	/*
1535	* 4KB - page.
1536	*/
1537	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK);
1538	RTGCPHYS GCPhys = GST_GET_PDE_GCPHYS(PdeSrc);
1539
1540	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1541	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
1542	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| ((iPDDst & 1) * (GUEST_PAGE_SIZE / 2)));
1543	# endif
1544	if (pShwPage->GCPhys == GCPhys)
1545	{
1546	/* Syncing it here isn't 100% safe and it's probably not worth spending time syncing it. */
1547	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
1548
1549	PGSTPT pPTSrc;
1550	rc = PGM_GCPHYS_2_PTR_V2(pVM, pVCpu, GST_GET_PDE_GCPHYS(PdeSrc), &pPTSrc);
1551	if (RT_SUCCESS(rc))
1552	{
1553	const unsigned iPTSrc = (GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK;
1554	GSTPTE PteSrc = pPTSrc->a[iPTSrc];
1555	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
1556	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
1557	Log2(("SyncPage: 4K %RGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx %s\n",
1558	GCPtrPage, PteSrc.u & X86_PTE_P,
1559	(PteSrc.u & PdeSrc.u & X86_PTE_RW),
1560	(PteSrc.u & PdeSrc.u & X86_PTE_US),
1561	(uint64_t)PteSrc.u,
1562	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
1563	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
1564	}
1565	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePage4KBPages));
1566	PGM_INVL_PG(pVCpu, GCPtrPage);
1567	}
1568	else
1569	{
1570	/*
1571	* The page table address changed.
1572	*/
1573	LogFlow(("InvalidatePage: Out-of-sync at %RGp PdeSrc=%RX64 PdeDst=%RX64 ShwGCPhys=%RGp iPDDst=%#x\n",
1574	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u, pShwPage->GCPhys, iPDDst));
1575	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, pShwPde->idx, iPDDst);
1576	SHW_PDE_ATOMIC_SET(*pPdeDst, 0);
1577	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePagePDOutOfSync));
1578	PGM_INVL_VCPU_TLBS(pVCpu);
1579	}
1580	}
1581	else
1582	{
1583	/*
1584	* 2/4MB - page.
1585	*/
1586	/* Before freeing the page, check if anything really changed. */
1587	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK);
1588	RTGCPHYS GCPhys = GST_GET_BIG_PDE_GCPHYS(pVM, PdeSrc);
1589	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
1590	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
1591	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| (GCPtrPage & (1 << X86_PD_PAE_SHIFT)));
1592	# endif
1593	if ( pShwPage->GCPhys == GCPhys
1594	&& pShwPage->enmKind == BTH_PGMPOOLKIND_PT_FOR_BIG)
1595	{
1596	/* ASSUMES a the given bits are identical for 4M and normal PDEs */
1597	/** @todo This test is wrong as it cannot check the G bit!
1598	* FIXME */
1599	if ( (PdeSrc.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US))
1600	== (PdeDst.u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_US))
1601	&& ( (PdeSrc.u & X86_PDE4M_D) /** @todo rainy day: What about read-only 4M pages? not very common, but still... */
1602	\|\| (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)))
1603	{
1604	LogFlow(("Skipping flush for big page containing %RGv (PD=%X .u=%RX64)-> nothing has changed!\n", GCPtrPage, iPDSrc, PdeSrc.u));
1605	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePage4MBPagesSkip));
1606	return VINF_SUCCESS;
1607	}
1608	}
1609
1610	/*
1611	* Ok, the page table is present and it's been changed in the guest.
1612	* If we're in host context, we'll just mark it as not present taking the lazy approach.
1613	* We could do this for some flushes in GC too, but we need an algorithm for
1614	* deciding which 4MB pages containing code likely to be executed very soon.
1615	*/
1616	LogFlow(("InvalidatePage: Out-of-sync PD at %RGp PdeSrc=%RX64 PdeDst=%RX64\n",
1617	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
1618	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, pShwPde->idx, iPDDst);
1619	SHW_PDE_ATOMIC_SET(*pPdeDst, 0);
1620	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePage4MBPages));
1621	PGM_INVL_BIG_PG(pVCpu, GCPtrPage);
1622	}
1623	}
1624	else
1625	{
1626	/*
1627	* Page directory is not present, mark shadow PDE not present.
1628	*/
1629	pgmPoolFree(pVM, PdeDst.u & SHW_PDE_PG_MASK, pShwPde->idx, iPDDst);
1630	SHW_PDE_ATOMIC_SET(*pPdeDst, 0);
1631	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,InvalidatePagePDNPs));
1632	PGM_INVL_PG(pVCpu, GCPtrPage);
1633	}
1634	return rc;
1635
1636	#else /* guest real and protected mode, nested + ept, none. */
1637	/* There's no such thing as InvalidatePage when paging is disabled, so just ignore. */
1638	NOREF(pVCpu); NOREF(GCPtrPage);
1639	return VINF_SUCCESS;
1640	#endif
1641	}
1642
1643	#if PGM_SHW_TYPE != PGM_TYPE_NONE
1644
1645	/**
1646	* Update the tracking of shadowed pages.
1647	*
1648	* @param pVCpu The cross context virtual CPU structure.
1649	* @param pShwPage The shadow page.
1650	* @param HCPhys The physical page we is being dereferenced.
1651	* @param iPte Shadow PTE index
1652	* @param GCPhysPage Guest physical address (only valid if pShwPage->fDirty is set)
1653	*/
1654	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackDeref)(PVMCPUCC pVCpu, PPGMPOOLPAGE pShwPage, RTHCPHYS HCPhys, uint16_t iPte,
1655	RTGCPHYS GCPhysPage)
1656	{
1657	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1658
1659	# if defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) \
1660	&& PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) \
1661	&& (PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_SHW_TYPE == PGM_TYPE_PAE /* pae/32bit combo */)
1662
1663	/* Use the hint we retrieved from the cached guest PT. */
1664	if (pShwPage->fDirty)
1665	{
1666	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1667
1668	Assert(pShwPage->cPresent);
1669	Assert(pPool->cPresent);
1670	pShwPage->cPresent--;
1671	pPool->cPresent--;
1672
1673	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhysPage);
1674	AssertRelease(pPhysPage);
1675	pgmTrackDerefGCPhys(pPool, pShwPage, pPhysPage, iPte);
1676	return;
1677	}
1678	# else
1679	NOREF(GCPhysPage);
1680	# endif
1681
1682	STAM_PROFILE_START(&pVM->pgm.s.Stats.StatTrackDeref, a);
1683	LogFlow(("SyncPageWorkerTrackDeref: Damn HCPhys=%RHp pShwPage->idx=%#x!!!\n", HCPhys, pShwPage->idx));
1684
1685	/** @todo If this turns out to be a bottle neck (very likely) two things can be done:
1686	* 1. have a medium sized HCPhys -> GCPhys TLB (hash?)
1687	* 2. write protect all shadowed pages. I.e. implement caching.
1688	*/
1689	/** @todo duplicated in the 2nd half of pgmPoolTracDerefGCPhysHint */
1690
1691	/*
1692	* Find the guest address.
1693	*/
1694	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRangesX);
1695	pRam;
1696	pRam = pRam->CTX_SUFF(pNext))
1697	{
1698	unsigned iPage = pRam->cb >> GUEST_PAGE_SHIFT;
1699	while (iPage-- > 0)
1700	{
1701	if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
1702	{
1703	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1704
1705	Assert(pShwPage->cPresent);
1706	Assert(pPool->cPresent);
1707	pShwPage->cPresent--;
1708	pPool->cPresent--;
1709
1710	pgmTrackDerefGCPhys(pPool, pShwPage, &pRam->aPages[iPage], iPte);
1711	STAM_PROFILE_STOP(&pVM->pgm.s.Stats.StatTrackDeref, a);
1712	return;
1713	}
1714	}
1715	}
1716
1717	for (;;)
1718	AssertReleaseMsgFailed(("HCPhys=%RHp wasn't found!\n", HCPhys));
1719	}
1720
1721
1722	/**
1723	* Update the tracking of shadowed pages.
1724	*
1725	* @param pVCpu The cross context virtual CPU structure.
1726	* @param pShwPage The shadow page.
1727	* @param u16 The top 16-bit of the pPage->HCPhys.
1728	* @param pPage Pointer to the guest page. this will be modified.
1729	* @param iPTDst The index into the shadow table.
1730	*/
1731	DECLINLINE(void) PGM_BTH_NAME(SyncPageWorkerTrackAddref)(PVMCPUCC pVCpu, PPGMPOOLPAGE pShwPage, uint16_t u16,
1732	PPGMPAGE pPage, const unsigned iPTDst)
1733	{
1734	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1735
1736	/*
1737	* Just deal with the simple first time here.
1738	*/
1739	if (!u16)
1740	{
1741	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackVirgin);
1742	u16 = PGMPOOL_TD_MAKE(1, pShwPage->idx);
1743	/* Save the page table index. */
1744	PGM_PAGE_SET_PTE_INDEX(pVM, pPage, iPTDst);
1745	}
1746	else
1747	u16 = pgmPoolTrackPhysExtAddref(pVM, pPage, u16, pShwPage->idx, iPTDst);
1748
1749	/* write back */
1750	Log2(("SyncPageWorkerTrackAddRef: u16=%#x->%#x iPTDst=%#x\n", u16, PGM_PAGE_GET_TRACKING(pPage), iPTDst));
1751	PGM_PAGE_SET_TRACKING(pVM, pPage, u16);
1752
1753	/* update statistics. */
1754	pVM->pgm.s.CTX_SUFF(pPool)->cPresent++;
1755	pShwPage->cPresent++;
1756	if (pShwPage->iFirstPresent > iPTDst)
1757	pShwPage->iFirstPresent = iPTDst;
1758	}
1759
1760
1761	/**
1762	* Modifies a shadow PTE to account for access handlers.
1763	*
1764	* @param pVM The cross context VM structure.
1765	* @param pVCpu The cross context virtual CPU structure.
1766	* @param pPage The page in question.
1767	* @param GCPhysPage The guest-physical address of the page.
1768	* @param fPteSrc The shadowed flags of the source PTE. Must include the
1769	* A (accessed) bit so it can be emulated correctly.
1770	* @param pPteDst The shadow PTE (output). This is temporary storage and
1771	* does not need to be set atomically.
1772	*/
1773	DECLINLINE(void) PGM_BTH_NAME(SyncHandlerPte)(PVMCC pVM, PVMCPUCC pVCpu, PCPGMPAGE pPage, RTGCPHYS GCPhysPage, uint64_t fPteSrc,
1774	PSHWPTE pPteDst)
1775	{
1776	RT_NOREF_PV(pVM); RT_NOREF_PV(fPteSrc); RT_NOREF_PV(pVCpu); RT_NOREF_PV(GCPhysPage);
1777
1778	/** @todo r=bird: Are we actually handling dirty and access bits for pages with access handlers correctly? No.
1779	* Update: \#PF should deal with this before or after calling the handlers. It has all the info to do the job efficiently. */
1780	if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
1781	{
1782	LogFlow(("SyncHandlerPte: monitored page (%R[pgmpage]) -> mark read-only\n", pPage));
1783	# if PGM_SHW_TYPE == PGM_TYPE_EPT
1784	pPteDst->u = PGM_PAGE_GET_HCPHYS(pPage) \| EPT_E_READ \| EPT_E_EXECUTE \| EPT_E_MEMTYPE_WB \| EPT_E_IGNORE_PAT;
1785	# else
1786	if (fPteSrc & X86_PTE_A)
1787	{
1788	SHW_PTE_SET(*pPteDst, fPteSrc \| PGM_PAGE_GET_HCPHYS(pPage));
1789	SHW_PTE_SET_RO(*pPteDst);
1790	}
1791	else
1792	SHW_PTE_SET(*pPteDst, 0);
1793	# endif
1794	}
1795	# ifdef PGM_WITH_MMIO_OPTIMIZATIONS
1796	# if PGM_SHW_TYPE == PGM_TYPE_EPT \|\| PGM_SHW_TYPE == PGM_TYPE_PAE \|\| PGM_SHW_TYPE == PGM_TYPE_AMD64
1797	else if ( PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage)
1798	&& ( BTH_IS_NP_ACTIVE(pVM)
1799	\|\| (fPteSrc & (X86_PTE_RW \| X86_PTE_US)) == X86_PTE_RW) /** @todo Remove X86_PTE_US here and pGstWalk->Core.fEffectiveUS before the sync page test. */
1800	# if PGM_SHW_TYPE == PGM_TYPE_AMD64
1801	&& pVM->pgm.s.fLessThan52PhysicalAddressBits
1802	# endif
1803	)
1804	{
1805	LogFlow(("SyncHandlerPte: MMIO page -> invalid \n"));
1806	# if PGM_SHW_TYPE == PGM_TYPE_EPT
1807	/* 25.2.3.1: Reserved physical address bit -> EPT Misconfiguration (exit 49) */
1808	pPteDst->u = pVM->pgm.s.HCPhysInvMmioPg
1809	/* 25.2.3.1: bits 2:0 = 010b -> EPT Misconfiguration (exit 49) */
1810	\| EPT_E_WRITE
1811	/* 25.2.3.1: leaf && 2:0 != 0 && u3Emt in {2, 3, 7} -> EPT Misconfiguration */
1812	\| EPT_E_MEMTYPE_INVALID_3;
1813	# else
1814	/* Set high page frame bits that MBZ (bankers on PAE, CPU dependent on AMD64). */
1815	SHW_PTE_SET(*pPteDst, pVM->pgm.s.HCPhysInvMmioPg \| X86_PTE_PAE_MBZ_MASK_NO_NX \| X86_PTE_P);
1816	# endif
1817	}
1818	# endif
1819	# endif /* PGM_WITH_MMIO_OPTIMIZATIONS */
1820	else
1821	{
1822	LogFlow(("SyncHandlerPte: monitored page (%R[pgmpage]) -> mark not present\n", pPage));
1823	SHW_PTE_SET(*pPteDst, 0);
1824	}
1825	/** @todo count these kinds of entries. */
1826	}
1827
1828
1829	/**
1830	* Creates a 4K shadow page for a guest page.
1831	*
1832	* For 4M pages the caller must convert the PDE4M to a PTE, this includes adjusting the
1833	* physical address. The PdeSrc argument only the flags are used. No page
1834	* structured will be mapped in this function.
1835	*
1836	* @param pVCpu The cross context virtual CPU structure.
1837	* @param pPteDst Destination page table entry.
1838	* @param PdeSrc Source page directory entry (i.e. Guest OS page directory entry).
1839	* Can safely assume that only the flags are being used.
1840	* @param PteSrc Source page table entry (i.e. Guest OS page table entry).
1841	* @param pShwPage Pointer to the shadow page.
1842	* @param iPTDst The index into the shadow table.
1843	*
1844	* @remark Not used for 2/4MB pages!
1845	*/
1846	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) \|\| defined(DOXYGEN_RUNNING)
1847	static void PGM_BTH_NAME(SyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPteDst, GSTPDE PdeSrc, GSTPTE PteSrc,
1848	PPGMPOOLPAGE pShwPage, unsigned iPTDst)
1849	# else
1850	static void PGM_BTH_NAME(SyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPteDst, RTGCPHYS GCPhysPage,
1851	PPGMPOOLPAGE pShwPage, unsigned iPTDst)
1852	# endif
1853	{
1854	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1855	RTGCPHYS GCPhysOldPage = NIL_RTGCPHYS;
1856
1857	# if defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) \
1858	&& PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) \
1859	&& (PGM_GST_TYPE == PGM_TYPE_PAE \|\| PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_SHW_TYPE == PGM_TYPE_PAE /* pae/32bit combo */)
1860
1861	if (pShwPage->fDirty)
1862	{
1863	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1864	PGSTPT pGstPT;
1865
1866	/* Note that iPTDst can be used to index the guest PT even in the pae/32bit combo as we copy only half the table; see pgmPoolAddDirtyPage. */
1867	pGstPT = (PGSTPT)&pPool->aDirtyPages[pShwPage->idxDirtyEntry].aPage[0];
1868	GCPhysOldPage = GST_GET_PTE_GCPHYS(pGstPT->a[iPTDst]);
1869	pGstPT->a[iPTDst].u = PteSrc.u;
1870	}
1871	# else
1872	Assert(!pShwPage->fDirty);
1873	# endif
1874
1875	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
1876	if ( (PteSrc.u & X86_PTE_P)
1877	&& GST_IS_PTE_VALID(pVCpu, PteSrc))
1878	# endif
1879	{
1880	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
1881	RTGCPHYS GCPhysPage = GST_GET_PTE_GCPHYS(PteSrc);
1882	# endif
1883	PGM_A20_ASSERT_MASKED(pVCpu, GCPhysPage);
1884
1885	/*
1886	* Find the ram range.
1887	*/
1888	PPGMPAGE pPage;
1889	int rc = pgmPhysGetPageEx(pVM, GCPhysPage, &pPage);
1890	if (RT_SUCCESS(rc))
1891	{
1892	/* Ignore ballooned pages.
1893	Don't return errors or use a fatal assert here as part of a
1894	shadow sync range might included ballooned pages. */
1895	if (PGM_PAGE_IS_BALLOONED(pPage))
1896	{
1897	Assert(!SHW_PTE_IS_P(pPteDst)); /* @todo user tracking needs updating if this triggers. */
1898	return;
1899	}
1900
1901	# ifndef VBOX_WITH_NEW_LAZY_PAGE_ALLOC
1902	/* Make the page writable if necessary. */
1903	if ( PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM
1904	&& ( PGM_PAGE_IS_ZERO(pPage)
1905	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
1906	\|\| ( (PteSrc.u & X86_PTE_RW)
1907	# else
1908	\|\| ( 1
1909	# endif
1910	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED
1911	# ifdef VBOX_WITH_REAL_WRITE_MONITORED_PAGES
1912	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_WRITE_MONITORED
1913	# endif
1914	# ifdef VBOX_WITH_PAGE_SHARING
1915	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_SHARED
1916	# endif
1917	)
1918	)
1919	)
1920	{
1921	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhysPage);
1922	AssertRC(rc);
1923	}
1924	# endif
1925
1926	/*
1927	* Make page table entry.
1928	*/
1929	SHWPTE PteDst;
1930	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
1931	uint64_t fGstShwPteFlags = GST_GET_PTE_SHW_FLAGS(pVCpu, PteSrc);
1932	# else
1933	uint64_t fGstShwPteFlags = X86_PTE_P \| X86_PTE_RW \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D;
1934	# endif
1935	if (!PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) \|\| PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
1936	{
1937	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
1938	/*
1939	* If the page or page directory entry is not marked accessed,
1940	* we mark the page not present.
1941	*/
1942	if (!(PteSrc.u & X86_PTE_A) \|\| !(PdeSrc.u & X86_PDE_A))
1943	{
1944	LogFlow(("SyncPageWorker: page and or page directory not accessed -> mark not present\n"));
1945	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,AccessedPage));
1946	SHW_PTE_SET(PteDst, 0);
1947	}
1948	/*
1949	* If the page is not flagged as dirty and is writable, then make it read-only, so we can set the dirty bit
1950	* when the page is modified.
1951	*/
1952	else if (!(PteSrc.u & X86_PTE_D) && (PdeSrc.u & PteSrc.u & X86_PTE_RW))
1953	{
1954	AssertCompile(X86_PTE_RW == X86_PDE_RW);
1955	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPage));
1956	SHW_PTE_SET(PteDst,
1957	fGstShwPteFlags
1958	\| PGM_PAGE_GET_HCPHYS(pPage)
1959	\| PGM_PTFLAGS_TRACK_DIRTY);
1960	SHW_PTE_SET_RO(PteDst);
1961	}
1962	else
1963	# endif
1964	{
1965	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageSkipped));
1966	# if PGM_SHW_TYPE == PGM_TYPE_EPT
1967	PteDst.u = PGM_PAGE_GET_HCPHYS(pPage)
1968	\| EPT_E_READ \| EPT_E_WRITE \| EPT_E_EXECUTE \| EPT_E_MEMTYPE_WB \| EPT_E_IGNORE_PAT;
1969	# else
1970	SHW_PTE_SET(PteDst, fGstShwPteFlags \| PGM_PAGE_GET_HCPHYS(pPage));
1971	# endif
1972	}
1973
1974	/*
1975	* Make sure only allocated pages are mapped writable.
1976	*/
1977	if ( SHW_PTE_IS_P_RW(PteDst)
1978	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED)
1979	{
1980	/* Still applies to shared pages. */
1981	Assert(!PGM_PAGE_IS_ZERO(pPage));
1982	SHW_PTE_SET_RO(PteDst); /** @todo this isn't quite working yet. Why, isn't it? */
1983	Log3(("SyncPageWorker: write-protecting %RGp pPage=%R[pgmpage]at iPTDst=%d\n", GCPhysPage, pPage, iPTDst));
1984	}
1985	}
1986	else
1987	PGM_BTH_NAME(SyncHandlerPte)(pVM, pVCpu, pPage, GCPhysPage, fGstShwPteFlags, &PteDst);
1988
1989	/*
1990	* Keep user track up to date.
1991	*/
1992	if (SHW_PTE_IS_P(PteDst))
1993	{
1994	if (!SHW_PTE_IS_P(*pPteDst))
1995	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPTDst);
1996	else if (SHW_PTE_GET_HCPHYS(*pPteDst) != SHW_PTE_GET_HCPHYS(PteDst))
1997	{
1998	Log2(("SyncPageWorker: deref! pPteDst=%RX64 PteDst=%RX64\n", SHW_PTE_LOG64(pPteDst), SHW_PTE_LOG64(PteDst)));
1999	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPteDst), iPTDst, GCPhysOldPage);
2000	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPTDst);
2001	}
2002	}
2003	else if (SHW_PTE_IS_P(*pPteDst))
2004	{
2005	Log2(("SyncPageWorker: deref! pPteDst=%RX64\n", SHW_PTE_LOG64(pPteDst)));
2006	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPteDst), iPTDst, GCPhysOldPage);
2007	}
2008
2009	/*
2010	* Update statistics and commit the entry.
2011	*/
2012	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
2013	if (!(PteSrc.u & X86_PTE_G))
2014	pShwPage->fSeenNonGlobal = true;
2015	# endif
2016	SHW_PTE_ATOMIC_SET2(*pPteDst, PteDst);
2017	return;
2018	}
2019
2020	/** @todo count these three different kinds. */
2021	Log2(("SyncPageWorker: invalid address in Pte\n"));
2022	}
2023	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
2024	else if (!(PteSrc.u & X86_PTE_P))
2025	Log2(("SyncPageWorker: page not present in Pte\n"));
2026	else
2027	Log2(("SyncPageWorker: invalid Pte\n"));
2028	# endif
2029
2030	/*
2031	* The page is not present or the PTE is bad. Replace the shadow PTE by
2032	* an empty entry, making sure to keep the user tracking up to date.
2033	*/
2034	if (SHW_PTE_IS_P(*pPteDst))
2035	{
2036	Log2(("SyncPageWorker: deref! pPteDst=%RX64\n", SHW_PTE_LOG64(pPteDst)));
2037	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPteDst), iPTDst, GCPhysOldPage);
2038	}
2039	SHW_PTE_ATOMIC_SET(*pPteDst, 0);
2040	}
2041
2042
2043	/**
2044	* Syncs a guest OS page.
2045	*
2046	* There are no conflicts at this point, neither is there any need for
2047	* page table allocations.
2048	*
2049	* When called in PAE or AMD64 guest mode, the guest PDPE shall be valid.
2050	* When called in AMD64 guest mode, the guest PML4E shall be valid.
2051	*
2052	* @returns VBox status code.
2053	* @returns VINF_PGM_SYNCPAGE_MODIFIED_PDE if it modifies the PDE in any way.
2054	* @param pVCpu The cross context virtual CPU structure.
2055	* @param PdeSrc Page directory entry of the guest.
2056	* @param GCPtrPage Guest context page address.
2057	* @param cPages Number of pages to sync (PGM_SYNC_N_PAGES) (default=1).
2058	* @param uErr Fault error (X86_TRAP_PF_*).
2059	*/
2060	static int PGM_BTH_NAME(SyncPage)(PVMCPUCC pVCpu, GSTPDE PdeSrc, RTGCPTR GCPtrPage, unsigned cPages, unsigned uErr)
2061	{
2062	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
2063	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
2064	LogFlow(("SyncPage: GCPtrPage=%RGv cPages=%u uErr=%#x\n", GCPtrPage, cPages, uErr));
2065	RT_NOREF_PV(uErr); RT_NOREF_PV(cPages); RT_NOREF_PV(GCPtrPage);
2066
2067	PGM_LOCK_ASSERT_OWNER(pVM);
2068
2069	# if ( PGM_GST_TYPE == PGM_TYPE_32BIT \
2070	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
2071	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64) \
2072	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE)
2073
2074	/*
2075	* Assert preconditions.
2076	*/
2077	Assert(PdeSrc.u & X86_PDE_P);
2078	Assert(cPages);
2079	# if 0 /* rarely useful; leave for debugging. */
2080	STAM_COUNTER_INC(&pVCpu->pgm.s.StatSyncPagePD[(GCPtrPage >> GST_PD_SHIFT) & GST_PD_MASK]);
2081	# endif
2082
2083	/*
2084	* Get the shadow PDE, find the shadow page table in the pool.
2085	*/
2086	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2087	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
2088	PX86PDE pPdeDst = pgmShwGet32BitPDEPtr(pVCpu, GCPtrPage);
2089
2090	/* Fetch the pgm pool shadow descriptor. */
2091	PPGMPOOLPAGE pShwPde = pVCpu->pgm.s.CTX_SUFF(pShwPageCR3);
2092	Assert(pShwPde);
2093
2094	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
2095	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
2096	PPGMPOOLPAGE pShwPde = NULL;
2097	PX86PDPAE pPDDst;
2098
2099	/* Fetch the pgm pool shadow descriptor. */
2100	int rc2 = pgmShwGetPaePoolPagePD(pVCpu, GCPtrPage, &pShwPde);
2101	AssertRCSuccessReturn(rc2, rc2);
2102	Assert(pShwPde);
2103
2104	pPDDst = (PX86PDPAE)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPde);
2105	PX86PDEPAE pPdeDst = &pPDDst->a[iPDDst];
2106
2107	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
2108	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
2109	const unsigned iPdpt = (GCPtrPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
2110	PX86PDPAE pPDDst = NULL; /* initialized to shut up gcc */
2111	PX86PDPT pPdptDst = NULL; /* initialized to shut up gcc */
2112
2113	int rc2 = pgmShwGetLongModePDPtr(pVCpu, GCPtrPage, NULL, &pPdptDst, &pPDDst);
2114	AssertRCSuccessReturn(rc2, rc2);
2115	Assert(pPDDst && pPdptDst);
2116	PX86PDEPAE pPdeDst = &pPDDst->a[iPDDst];
2117	# endif
2118	SHWPDE PdeDst = *pPdeDst;
2119
2120	/*
2121	* - In the guest SMP case we could have blocked while another VCPU reused
2122	* this page table.
2123	* - With W7-64 we may also take this path when the A bit is cleared on
2124	* higher level tables (PDPE/PML4E). The guest does not invalidate the
2125	* relevant TLB entries. If we're write monitoring any page mapped by
2126	* the modified entry, we may end up here with a "stale" TLB entry.
2127	*/
2128	if (!(PdeDst.u & X86_PDE_P))
2129	{
2130	Log(("CPU%u: SyncPage: Pde at %RGv changed behind our back? (pPdeDst=%p/%RX64) uErr=%#x\n", pVCpu->idCpu, GCPtrPage, pPdeDst, (uint64_t)PdeDst.u, (uint32_t)uErr));
2131	AssertMsg(pVM->cCpus > 1 \|\| (uErr & (X86_TRAP_PF_P \| X86_TRAP_PF_RW)) == (X86_TRAP_PF_P \| X86_TRAP_PF_RW),
2132	("Unexpected missing PDE p=%p/%RX64 uErr=%#x\n", pPdeDst, (uint64_t)PdeDst.u, (uint32_t)uErr));
2133	if (uErr & X86_TRAP_PF_P)
2134	PGM_INVL_PG(pVCpu, GCPtrPage);
2135	return VINF_SUCCESS; /* force the instruction to be executed again. */
2136	}
2137
2138	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK);
2139	Assert(pShwPage);
2140
2141	# if PGM_GST_TYPE == PGM_TYPE_AMD64
2142	/* Fetch the pgm pool shadow descriptor. */
2143	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & X86_PDPE_PG_MASK);
2144	Assert(pShwPde);
2145	# endif
2146
2147	/*
2148	* Check that the page is present and that the shadow PDE isn't out of sync.
2149	*/
2150	const bool fBigPage = (PdeSrc.u & X86_PDE_PS) && GST_IS_PSE_ACTIVE(pVCpu);
2151	const bool fPdeValid = !fBigPage ? GST_IS_PDE_VALID(pVCpu, PdeSrc) : GST_IS_BIG_PDE_VALID(pVCpu, PdeSrc);
2152	RTGCPHYS GCPhys;
2153	if (!fBigPage)
2154	{
2155	GCPhys = GST_GET_PDE_GCPHYS(PdeSrc);
2156	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2157	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
2158	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| ((iPDDst & 1) * (GUEST_PAGE_SIZE / 2)));
2159	# endif
2160	}
2161	else
2162	{
2163	GCPhys = GST_GET_BIG_PDE_GCPHYS(pVM, PdeSrc);
2164	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2165	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
2166	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| (GCPtrPage & (1 << X86_PD_PAE_SHIFT)));
2167	# endif
2168	}
2169	/** @todo This doesn't check the G bit of 2/4MB pages. FIXME */
2170	if ( fPdeValid
2171	&& pShwPage->GCPhys == GCPhys
2172	&& (PdeSrc.u & X86_PDE_P)
2173	&& (PdeSrc.u & X86_PDE_US) == (PdeDst.u & X86_PDE_US)
2174	&& ((PdeSrc.u & X86_PDE_RW) == (PdeDst.u & X86_PDE_RW) \|\| !(PdeDst.u & X86_PDE_RW))
2175	# if PGM_WITH_NX(PGM_GST_TYPE, PGM_SHW_TYPE)
2176	&& ((PdeSrc.u & X86_PDE_PAE_NX) == (PdeDst.u & X86_PDE_PAE_NX) \|\| !GST_IS_NX_ACTIVE(pVCpu))
2177	# endif
2178	)
2179	{
2180	/*
2181	* Check that the PDE is marked accessed already.
2182	* Since we set the accessed bit before getting here on a #PF, this
2183	* check is only meant for dealing with non-#PF'ing paths.
2184	*/
2185	if (PdeSrc.u & X86_PDE_A)
2186	{
2187	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
2188	if (!fBigPage)
2189	{
2190	/*
2191	* 4KB Page - Map the guest page table.
2192	*/
2193	PGSTPT pPTSrc;
2194	int rc = PGM_GCPHYS_2_PTR_V2(pVM, pVCpu, GST_GET_PDE_GCPHYS(PdeSrc), &pPTSrc);
2195	if (RT_SUCCESS(rc))
2196	{
2197	# ifdef PGM_SYNC_N_PAGES
2198	Assert(cPages == 1 \|\| !(uErr & X86_TRAP_PF_P));
2199	if ( cPages > 1
2200	&& !(uErr & X86_TRAP_PF_P)
2201	&& !VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
2202	{
2203	/*
2204	* This code path is currently only taken when the caller is PGMTrap0eHandler
2205	* for non-present pages!
2206	*
2207	* We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and
2208	* deal with locality.
2209	*/
2210	unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2211	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
2212	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
2213	const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512;
2214	# else
2215	const unsigned offPTSrc = 0;
2216	# endif
2217	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, RT_ELEMENTS(pPTDst->a));
2218	if (iPTDst < PGM_SYNC_NR_PAGES / 2)
2219	iPTDst = 0;
2220	else
2221	iPTDst -= PGM_SYNC_NR_PAGES / 2;
2222
2223	for (; iPTDst < iPTDstEnd; iPTDst++)
2224	{
2225	const PGSTPTE pPteSrc = &pPTSrc->a[offPTSrc + iPTDst];
2226
2227	if ( (pPteSrc->u & X86_PTE_P)
2228	&& !SHW_PTE_IS_P(pPTDst->a[iPTDst]))
2229	{
2230	RTGCPTR GCPtrCurPage = (GCPtrPage & ~(RTGCPTR)(GST_PT_MASK << GST_PT_SHIFT))
2231	\| ((offPTSrc + iPTDst) << GUEST_PAGE_SHIFT);
2232	NOREF(GCPtrCurPage);
2233	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], PdeSrc, *pPteSrc, pShwPage, iPTDst);
2234	Log2(("SyncPage: 4K+ %RGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx%s\n",
2235	GCPtrCurPage, pPteSrc->u & X86_PTE_P,
2236	!!(pPteSrc->u & PdeSrc.u & X86_PTE_RW),
2237	!!(pPteSrc->u & PdeSrc.u & X86_PTE_US),
2238	(uint64_t)pPteSrc->u,
2239	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
2240	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
2241	}
2242	}
2243	}
2244	else
2245	# endif /* PGM_SYNC_N_PAGES */
2246	{
2247	const unsigned iPTSrc = (GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK;
2248	GSTPTE PteSrc = pPTSrc->a[iPTSrc];
2249	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2250	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
2251	Log2(("SyncPage: 4K %RGv PteSrc:{P=%d RW=%d U=%d raw=%08llx} PteDst=%08llx %s\n",
2252	GCPtrPage, PteSrc.u & X86_PTE_P,
2253	!!(PteSrc.u & PdeSrc.u & X86_PTE_RW),
2254	!!(PteSrc.u & PdeSrc.u & X86_PTE_US),
2255	(uint64_t)PteSrc.u,
2256	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
2257	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
2258	}
2259	}
2260	else /* MMIO or invalid page: emulated in #PF handler. */
2261	{
2262	LogFlow(("PGM_GCPHYS_2_PTR %RGp failed with %Rrc\n", GCPhys, rc));
2263	Assert(!SHW_PTE_IS_P(pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK]));
2264	}
2265	}
2266	else
2267	{
2268	/*
2269	* 4/2MB page - lazy syncing shadow 4K pages.
2270	* (There are many causes of getting here, it's no longer only CSAM.)
2271	*/
2272	/* Calculate the GC physical address of this 4KB shadow page. */
2273	GCPhys = PGM_A20_APPLY(pVCpu, GST_GET_BIG_PDE_GCPHYS(pVM, PdeSrc) \| (GCPtrPage & GST_BIG_PAGE_OFFSET_MASK));
2274	/* Find ram range. */
2275	PPGMPAGE pPage;
2276	int rc = pgmPhysGetPageEx(pVM, GCPhys, &pPage);
2277	if (RT_SUCCESS(rc))
2278	{
2279	AssertFatalMsg(!PGM_PAGE_IS_BALLOONED(pPage), ("Unexpected ballooned page at %RGp\n", GCPhys));
2280
2281	# ifndef VBOX_WITH_NEW_LAZY_PAGE_ALLOC
2282	/* Try to make the page writable if necessary. */
2283	if ( PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM
2284	&& ( PGM_PAGE_IS_ZERO(pPage)
2285	\|\| ( (PdeSrc.u & X86_PDE_RW)
2286	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED
2287	# ifdef VBOX_WITH_REAL_WRITE_MONITORED_PAGES
2288	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_WRITE_MONITORED
2289	# endif
2290	# ifdef VBOX_WITH_PAGE_SHARING
2291	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_SHARED
2292	# endif
2293	)
2294	)
2295	)
2296	{
2297	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhys);
2298	AssertRC(rc);
2299	}
2300	# endif
2301
2302	/*
2303	* Make shadow PTE entry.
2304	*/
2305	SHWPTE PteDst;
2306	if (!PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) \|\| PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
2307	SHW_PTE_SET(PteDst, GST_GET_BIG_PDE_SHW_FLAGS_4_PTE(pVCpu, PdeSrc) \| PGM_PAGE_GET_HCPHYS(pPage));
2308	else
2309	PGM_BTH_NAME(SyncHandlerPte)(pVM, pVCpu, pPage, GCPhys, GST_GET_BIG_PDE_SHW_FLAGS_4_PTE(pVCpu, PdeSrc), &PteDst);
2310
2311	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2312	if ( SHW_PTE_IS_P(PteDst)
2313	&& !SHW_PTE_IS_P(pPTDst->a[iPTDst]))
2314	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPTDst);
2315
2316	/* Make sure only allocated pages are mapped writable. */
2317	if ( SHW_PTE_IS_P_RW(PteDst)
2318	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED)
2319	{
2320	/* Still applies to shared pages. */
2321	Assert(!PGM_PAGE_IS_ZERO(pPage));
2322	SHW_PTE_SET_RO(PteDst); /** @todo this isn't quite working yet... */
2323	Log3(("SyncPage: write-protecting %RGp pPage=%R[pgmpage] at %RGv\n", GCPhys, pPage, GCPtrPage));
2324	}
2325
2326	SHW_PTE_ATOMIC_SET2(pPTDst->a[iPTDst], PteDst);
2327
2328	/*
2329	* If the page is not flagged as dirty and is writable, then make it read-only
2330	* at PD level, so we can set the dirty bit when the page is modified.
2331	*
2332	* ASSUMES that page access handlers are implemented on page table entry level.
2333	* Thus we will first catch the dirty access and set PDE.D and restart. If
2334	* there is an access handler, we'll trap again and let it work on the problem.
2335	*/
2336	/** @todo r=bird: figure out why we need this here, SyncPT should've taken care of this already.
2337	* As for invlpg, it simply frees the whole shadow PT.
2338	* ...It's possibly because the guest clears it and the guest doesn't really tell us... */
2339	if ((PdeSrc.u & (X86_PDE4M_D \| X86_PDE_RW)) == X86_PDE_RW)
2340	{
2341	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageBig));
2342	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
2343	PdeDst.u &= ~(SHWUINT)X86_PDE_RW;
2344	}
2345	else
2346	{
2347	PdeDst.u &= ~(SHWUINT)(PGM_PDFLAGS_TRACK_DIRTY \| X86_PDE_RW);
2348	PdeDst.u \|= PdeSrc.u & X86_PDE_RW;
2349	}
2350	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
2351	Log2(("SyncPage: BIG %RGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} GCPhys=%RGp%s\n",
2352	GCPtrPage, PdeSrc.u & X86_PDE_P, !!(PdeSrc.u & X86_PDE_RW), !!(PdeSrc.u & X86_PDE_US),
2353	(uint64_t)PdeSrc.u, GCPhys, PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
2354	}
2355	else
2356	{
2357	LogFlow(("PGM_GCPHYS_2_PTR %RGp (big) failed with %Rrc\n", GCPhys, rc));
2358	/** @todo must wipe the shadow page table entry in this
2359	* case. */
2360	}
2361	}
2362	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
2363	return VINF_SUCCESS;
2364	}
2365
2366	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPagePDNAs));
2367	}
2368	else if (fPdeValid)
2369	{
2370	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPagePDOutOfSync));
2371	Log2(("SyncPage: Out-Of-Sync PDE at %RGp PdeSrc=%RX64 PdeDst=%RX64 (GCPhys %RGp vs %RGp)\n",
2372	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u, pShwPage->GCPhys, GCPhys));
2373	}
2374	else
2375	{
2376	/// @todo STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_MID_Z(Stat,SyncPagePDOutOfSyncAndInvalid));
2377	Log2(("SyncPage: Bad PDE at %RGp PdeSrc=%RX64 PdeDst=%RX64 (GCPhys %RGp vs %RGp)\n",
2378	GCPtrPage, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u, pShwPage->GCPhys, GCPhys));
2379	}
2380
2381	/*
2382	* Mark the PDE not present. Restart the instruction and let #PF call SyncPT.
2383	* Yea, I'm lazy.
2384	*/
2385	pgmPoolFreeByPage(pPool, pShwPage, pShwPde->idx, iPDDst);
2386	SHW_PDE_ATOMIC_SET(*pPdeDst, 0);
2387
2388	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
2389	PGM_INVL_VCPU_TLBS(pVCpu);
2390	return VINF_PGM_SYNCPAGE_MODIFIED_PDE;
2391
2392
2393	# elif (PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
2394	&& !PGM_TYPE_IS_NESTED(PGM_SHW_TYPE) \
2395	&& (PGM_SHW_TYPE != PGM_TYPE_EPT \|\| PGM_GST_TYPE == PGM_TYPE_PROT)
2396	NOREF(PdeSrc);
2397
2398	# ifdef PGM_SYNC_N_PAGES
2399	/*
2400	* Get the shadow PDE, find the shadow page table in the pool.
2401	*/
2402	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
2403	X86PDE PdeDst = pgmShwGet32BitPDE(pVCpu, GCPtrPage);
2404
2405	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
2406	X86PDEPAE PdeDst = pgmShwGetPaePDE(pVCpu, GCPtrPage);
2407
2408	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
2409	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
2410	const unsigned iPdpt = (GCPtrPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64; NOREF(iPdpt);
2411	PX86PDPAE pPDDst = NULL; /* initialized to shut up gcc */
2412	X86PDEPAE PdeDst;
2413	PX86PDPT pPdptDst = NULL; /* initialized to shut up gcc */
2414
2415	int rc = pgmShwGetLongModePDPtr(pVCpu, GCPtrPage, NULL, &pPdptDst, &pPDDst);
2416	AssertRCSuccessReturn(rc, rc);
2417	Assert(pPDDst && pPdptDst);
2418	PdeDst = pPDDst->a[iPDDst];
2419
2420	# elif PGM_SHW_TYPE == PGM_TYPE_EPT
2421	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
2422	PEPTPD pPDDst;
2423	EPTPDE PdeDst;
2424
2425	int rc = pgmShwGetEPTPDPtr(pVCpu, GCPtrPage, NULL, &pPDDst);
2426	if (rc != VINF_SUCCESS)
2427	{
2428	AssertRC(rc);
2429	return rc;
2430	}
2431	Assert(pPDDst);
2432	PdeDst = pPDDst->a[iPDDst];
2433	# endif
2434	/* In the guest SMP case we could have blocked while another VCPU reused this page table. */
2435	if (!SHW_PDE_IS_P(PdeDst))
2436	{
2437	AssertMsg(pVM->cCpus > 1, ("Unexpected missing PDE %RX64\n", (uint64_t)PdeDst.u));
2438	Log(("CPU%d: SyncPage: Pde at %RGv changed behind our back!\n", pVCpu->idCpu, GCPtrPage));
2439	return VINF_SUCCESS; /* force the instruction to be executed again. */
2440	}
2441
2442	/* Can happen in the guest SMP case; other VCPU activated this PDE while we were blocking to handle the page fault. */
2443	if (SHW_PDE_IS_BIG(PdeDst))
2444	{
2445	Assert(pVM->pgm.s.fNestedPaging);
2446	Log(("CPU%d: SyncPage: Pde (big:%RX64) at %RGv changed behind our back!\n", pVCpu->idCpu, PdeDst.u, GCPtrPage));
2447	return VINF_SUCCESS;
2448	}
2449
2450	/* Mask away the page offset. */
2451	GCPtrPage &= ~((RTGCPTR)0xfff);
2452
2453	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, PdeDst.u & SHW_PDE_PG_MASK);
2454	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
2455
2456	Assert(cPages == 1 \|\| !(uErr & X86_TRAP_PF_P));
2457	if ( cPages > 1
2458	&& !(uErr & X86_TRAP_PF_P)
2459	&& !VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
2460	{
2461	/*
2462	* This code path is currently only taken when the caller is PGMTrap0eHandler
2463	* for non-present pages!
2464	*
2465	* We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and
2466	* deal with locality.
2467	*/
2468	unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2469	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, RT_ELEMENTS(pPTDst->a));
2470	if (iPTDst < PGM_SYNC_NR_PAGES / 2)
2471	iPTDst = 0;
2472	else
2473	iPTDst -= PGM_SYNC_NR_PAGES / 2;
2474	for (; iPTDst < iPTDstEnd; iPTDst++)
2475	{
2476	if (!SHW_PTE_IS_P(pPTDst->a[iPTDst]))
2477	{
2478	RTGCPTR GCPtrCurPage = PGM_A20_APPLY(pVCpu, (GCPtrPage & ~(RTGCPTR)(SHW_PT_MASK << SHW_PT_SHIFT))
2479	\| (iPTDst << GUEST_PAGE_SHIFT));
2480
2481	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], GCPtrCurPage, pShwPage, iPTDst);
2482	Log2(("SyncPage: 4K+ %RGv PteSrc:{P=1 RW=1 U=1} PteDst=%08llx%s\n",
2483	GCPtrCurPage,
2484	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
2485	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
2486
2487	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
2488	break;
2489	}
2490	else
2491	Log4(("%RGv iPTDst=%x pPTDst->a[iPTDst] %RX64\n",
2492	(GCPtrPage & ~(RTGCPTR)(SHW_PT_MASK << SHW_PT_SHIFT)) \| (iPTDst << GUEST_PAGE_SHIFT), iPTDst, SHW_PTE_LOG64(pPTDst->a[iPTDst]) ));
2493	}
2494	}
2495	else
2496	# endif /* PGM_SYNC_N_PAGES */
2497	{
2498	const unsigned iPTDst = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2499	RTGCPTR GCPtrCurPage = PGM_A20_APPLY(pVCpu, (GCPtrPage & ~(RTGCPTR)(SHW_PT_MASK << SHW_PT_SHIFT))
2500	\| (iPTDst << GUEST_PAGE_SHIFT));
2501
2502	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], GCPtrCurPage, pShwPage, iPTDst);
2503
2504	Log2(("SyncPage: 4K %RGv PteSrc:{P=1 RW=1 U=1}PteDst=%08llx%s\n",
2505	GCPtrPage,
2506	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
2507	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
2508	}
2509	return VINF_SUCCESS;
2510
2511	# else
2512	NOREF(PdeSrc);
2513	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
2514	return VERR_PGM_NOT_USED_IN_MODE;
2515	# endif
2516	}
2517
2518	#endif /* PGM_SHW_TYPE != PGM_TYPE_NONE */
2519
2520	#if !defined(IN_RING3) && defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT) && PGM_SHW_TYPE == PGM_TYPE_EPT
2521
2522	/**
2523	* Sync a shadow page for a nested-guest page.
2524	*
2525	* @param pVCpu The cross context virtual CPU structure.
2526	* @param pPte The shadow page table entry.
2527	* @param GCPhysPage The guest-physical address of the page.
2528	* @param pShwPage The shadow page of the page table.
2529	* @param iPte The index of the page table entry.
2530	* @param pGstWalkAll The guest page table walk result.
2531	*
2532	* @note Not to be used for 2/4MB pages!
2533	*/
2534	static void PGM_BTH_NAME(NestedSyncPageWorker)(PVMCPUCC pVCpu, PSHWPTE pPte, RTGCPHYS GCPhysPage, PPGMPOOLPAGE pShwPage,
2535	unsigned iPte, PCPGMPTWALKGST pGstWalkAll)
2536	{
2537	/*
2538	* Do not make assumptions about anything other than the final PTE entry in the
2539	* guest page table walk result. For instance, while mapping 2M PDEs as 4K pages,
2540	* the PDE might still be having its leaf bit set.
2541	*
2542	* In the future, we could consider introducing a generic SLAT macro like PSLATPTE
2543	* and using that instead of passing the full SLAT translation result.
2544	*/
2545	PGM_A20_ASSERT_MASKED(pVCpu, GCPhysPage);
2546	Assert(PGMPOOL_PAGE_IS_NESTED(pShwPage));
2547	Assert(!pShwPage->fDirty);
2548	Assert(pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_EPT);
2549	AssertMsg(!(pGstWalkAll->u.Ept.Pte.u & EPT_E_LEAF), ("Large page unexpected: %RX64\n", pGstWalkAll->u.Ept.Pte.u));
2550	AssertMsg((pGstWalkAll->u.Ept.Pte.u & EPT_PTE_PG_MASK) == GCPhysPage,
2551	("PTE address mismatch. GCPhysPage=%RGp Pte=%RX64\n", GCPhysPage, pGstWalkAll->u.Ept.Pte.u & EPT_PTE_PG_MASK));
2552
2553	/*
2554	* Find the ram range.
2555	*/
2556	PPGMPAGE pPage;
2557	int rc = pgmPhysGetPageEx(pVCpu->CTX_SUFF(pVM), GCPhysPage, &pPage);
2558	if (RT_SUCCESS(rc))
2559	{ /* likely */ }
2560	else
2561	{
2562	/*
2563	* This is a RAM hole/invalid/reserved address (not MMIO).
2564	* Nested Microsoft Hyper-V maps addresses like 0xf0220000 as RW WB memory.
2565	* Shadow a not-present page similar to MMIO, see @bugref{10318#c7}.
2566	*/
2567	Assert(rc == VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS);
2568	if (SHW_PTE_IS_P(*pPte))
2569	{
2570	Log2(("SyncPageWorker: deref! pPte=%RX64\n", SHW_PTE_LOG64(pPte)));
2571	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPte), iPte, NIL_RTGCPHYS);
2572	}
2573	Log7Func(("RAM hole/reserved %RGp -> ShwPte=0\n", GCPhysPage));
2574	SHW_PTE_ATOMIC_SET(*pPte, 0);
2575	return;
2576	}
2577
2578	Assert(!PGM_PAGE_IS_BALLOONED(pPage));
2579
2580	/*
2581	* Make page table entry.
2582	*/
2583	SHWPTE Pte;
2584	uint64_t const fGstShwPteFlags = pGstWalkAll->u.Ept.Pte.u & pVCpu->pgm.s.fGstEptShadowedPteMask;
2585	if (!PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) \|\| PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
2586	{
2587	# ifndef VBOX_WITH_NEW_LAZY_PAGE_ALLOC
2588	/* If it's the zero page or write to an unallocated page, allocate it to make it writable. */
2589	if ( PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM
2590	&& ( PGM_PAGE_IS_ZERO(pPage)
2591	\|\| ( (pGstWalkAll->u.Ept.Pte.u & EPT_E_WRITE)
2592	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED
2593	# ifdef VBOX_WITH_REAL_WRITE_MONITORED_PAGES
2594	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_WRITE_MONITORED
2595	# endif
2596	# ifdef VBOX_WITH_PAGE_SHARING
2597	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_SHARED
2598	# endif
2599	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_BALLOONED
2600	)
2601	)
2602	)
2603	{
2604	rc = pgmPhysPageMakeWritable(pVCpu->CTX_SUFF(pVM), pPage, GCPhysPage);
2605	AssertRC(rc);
2606	Log7Func(("made writable (%R[pgmpage]) at %RGp\n", pPage, GCPhysPage));
2607	}
2608	# endif
2609	/** @todo access bit. */
2610	Pte.u = PGM_PAGE_GET_HCPHYS(pPage) \| fGstShwPteFlags;
2611	Log7Func(("regular page (%R[pgmpage]) at %RGp -> %RX64\n", pPage, GCPhysPage, Pte.u));
2612	}
2613	else if (!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage))
2614	{
2615	/** @todo access bit. */
2616	Pte.u = PGM_PAGE_GET_HCPHYS(pPage) \| (fGstShwPteFlags & ~EPT_E_WRITE);
2617	Log7Func(("monitored page (%R[pgmpage]) at %RGp -> %RX64\n", pPage, GCPhysPage, Pte.u));
2618	}
2619	else
2620	{
2621	/** @todo Do MMIO optimizations here too? */
2622	Log7Func(("mmio/all page (%R[pgmpage]) at %RGp -> 0\n", pPage, GCPhysPage));
2623	Pte.u = 0;
2624	}
2625
2626	/* Make sure only allocated pages are mapped writable. */
2627	Assert(!SHW_PTE_IS_P_RW(Pte) \|\| PGM_PAGE_IS_ALLOCATED(pPage));
2628
2629	/*
2630	* Keep user track up to date.
2631	*/
2632	if (SHW_PTE_IS_P(Pte))
2633	{
2634	if (!SHW_PTE_IS_P(*pPte))
2635	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPte);
2636	else if (SHW_PTE_GET_HCPHYS(*pPte) != SHW_PTE_GET_HCPHYS(Pte))
2637	{
2638	Log2(("SyncPageWorker: deref! pPte=%RX64 Pte=%RX64\n", SHW_PTE_LOG64(pPte), SHW_PTE_LOG64(Pte)));
2639	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPte), iPte, NIL_RTGCPHYS);
2640	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPte);
2641	}
2642	}
2643	else if (SHW_PTE_IS_P(*pPte))
2644	{
2645	Log2(("SyncPageWorker: deref! pPte=%RX64\n", SHW_PTE_LOG64(pPte)));
2646	PGM_BTH_NAME(SyncPageWorkerTrackDeref)(pVCpu, pShwPage, SHW_PTE_GET_HCPHYS(*pPte), iPte, NIL_RTGCPHYS);
2647	}
2648
2649	/*
2650	* Commit the entry.
2651	*/
2652	SHW_PTE_ATOMIC_SET2(*pPte, Pte);
2653	return;
2654	}
2655
2656
2657	/**
2658	* Syncs a nested-guest page.
2659	*
2660	* There are no conflicts at this point, neither is there any need for
2661	* page table allocations.
2662	*
2663	* @returns VBox status code.
2664	* @param pVCpu The cross context virtual CPU structure.
2665	* @param GCPhysNestedPage The nested-guest physical address of the page being
2666	* synced.
2667	* @param GCPhysPage The guest-physical address of the page being synced.
2668	* @param cPages Number of pages to sync (PGM_SYNC_N_PAGES) (default=1).
2669	* @param uErr The page fault error (X86_TRAP_PF_XXX).
2670	* @param pGstWalkAll The guest page table walk result.
2671	*/
2672	static int PGM_BTH_NAME(NestedSyncPage)(PVMCPUCC pVCpu, RTGCPHYS GCPhysNestedPage, RTGCPHYS GCPhysPage, unsigned cPages,
2673	uint32_t uErr, PPGMPTWALKGST pGstWalkAll)
2674	{
2675	PGM_A20_ASSERT_MASKED(pVCpu, GCPhysPage);
2676	Assert(!(GCPhysNestedPage & GUEST_PAGE_OFFSET_MASK));
2677	Assert(!(GCPhysPage & GUEST_PAGE_OFFSET_MASK));
2678
2679	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
2680	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
2681	Log7Func(("GCPhysNestedPage=%RGv GCPhysPage=%RGp cPages=%u uErr=%#x\n", GCPhysNestedPage, GCPhysPage, cPages, uErr));
2682	RT_NOREF_PV(uErr); RT_NOREF_PV(cPages);
2683
2684	PGM_LOCK_ASSERT_OWNER(pVM);
2685
2686	/*
2687	* Get the shadow PDE, find the shadow page table in the pool.
2688	*/
2689	unsigned const iPde = ((GCPhysNestedPage >> EPT_PD_SHIFT) & EPT_PD_MASK);
2690	PEPTPD pPd;
2691	int rc = pgmShwGetNestedEPTPDPtr(pVCpu, GCPhysNestedPage, NULL, &pPd, pGstWalkAll);
2692	if (RT_SUCCESS(rc))
2693	{ /* likely */ }
2694	else
2695	{
2696	Log(("Failed to fetch EPT PD for %RGp (%RGp) rc=%Rrc\n", GCPhysNestedPage, GCPhysPage, rc));
2697	return rc;
2698	}
2699	Assert(pPd);
2700	EPTPDE Pde = pPd->a[iPde];
2701
2702	/* In the guest SMP case we could have blocked while another VCPU reused this page table. */
2703	if (!SHW_PDE_IS_P(Pde))
2704	{
2705	AssertMsg(pVM->cCpus > 1, ("Unexpected missing PDE %RX64\n", (uint64_t)Pde.u));
2706	Log7Func(("CPU%d: SyncPage: Pde at %RGp changed behind our back!\n", pVCpu->idCpu, GCPhysNestedPage));
2707	return VINF_SUCCESS; /* force the instruction to be executed again. */
2708	}
2709
2710	/* Can happen in the guest SMP case; other VCPU activated this PDE while we were blocking to handle the page fault. */
2711	if (SHW_PDE_IS_BIG(Pde))
2712	{
2713	Log7Func(("CPU%d: SyncPage: %RGp changed behind our back!\n", pVCpu->idCpu, GCPhysNestedPage));
2714	return VINF_SUCCESS;
2715	}
2716
2717	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, Pde.u & EPT_PDE_PG_MASK);
2718	PEPTPT pPt = (PEPTPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
2719
2720	/*
2721	* If we've shadowed a guest EPT PDE that maps a 2M page using a 4K table,
2722	* then sync the 4K sub-page in the 2M range.
2723	*/
2724	if (pGstWalkAll->u.Ept.Pde.u & EPT_E_LEAF)
2725	{
2726	Assert(!SHW_PDE_IS_BIG(Pde));
2727
2728	Assert(pGstWalkAll->u.Ept.Pte.u == 0);
2729	Assert((Pde.u & EPT_PRESENT_MASK) == (pGstWalkAll->u.Ept.Pde.u & EPT_PRESENT_MASK));
2730	Assert(pShwPage->GCPhys == (pGstWalkAll->u.Ept.Pde.u & EPT_PDE2M_PG_MASK));
2731
2732	#if defined(VBOX_STRICT) && defined(DEBUG_ramshankar)
2733	PPGMPAGE pPage;
2734	rc = pgmPhysGetPageEx(pVM, GCPhysPage, &pPage); AssertRC(rc);
2735	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) != PGM_PAGE_PDE_TYPE_PDE);
2736	Assert(pShwPage->enmKind == PGMPOOLKIND_EPT_PT_FOR_EPT_2MB);
2737	#endif
2738	uint64_t const fGstPteFlags = pGstWalkAll->u.Ept.Pde.u & pVCpu->pgm.s.fGstEptShadowedBigPdeMask & ~EPT_E_LEAF;
2739	pGstWalkAll->u.Ept.Pte.u = GCPhysPage \| fGstPteFlags;
2740
2741	unsigned const iPte = (GCPhysNestedPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2742	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPte], GCPhysPage, pShwPage, iPte, pGstWalkAll);
2743	Log7Func(("4K: GCPhysPage=%RGp iPte=%u ShwPte=%08llx\n", GCPhysPage, iPte, SHW_PTE_LOG64(pPt->a[iPte])));
2744
2745	/* Restore modifications did to the guest-walk result above in case callers might inspect them later. */
2746	pGstWalkAll->u.Ept.Pte.u = 0;
2747	return VINF_SUCCESS;
2748	}
2749
2750	Assert(cPages == 1 \|\| !(uErr & X86_TRAP_PF_P));
2751	# ifdef PGM_SYNC_N_PAGES
2752	if ( cPages > 1
2753	&& !(uErr & X86_TRAP_PF_P)
2754	&& !VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
2755	{
2756	/*
2757	* This code path is currently only taken for non-present pages!
2758	*
2759	* We're setting PGM_SYNC_NR_PAGES pages around the faulting page to sync it and
2760	* deal with locality.
2761	*/
2762	unsigned iPte = (GCPhysNestedPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2763	unsigned const iPteEnd = RT_MIN(iPte + PGM_SYNC_NR_PAGES / 2, RT_ELEMENTS(pPt->a));
2764	if (iPte < PGM_SYNC_NR_PAGES / 2)
2765	iPte = 0;
2766	else
2767	iPte -= PGM_SYNC_NR_PAGES / 2;
2768	for (; iPte < iPteEnd; iPte++)
2769	{
2770	if (!SHW_PTE_IS_P(pPt->a[iPte]))
2771	{
2772	PGMPTWALKGST GstWalkPt;
2773	PGMPTWALK WalkPt;
2774	GCPhysNestedPage &= ~(SHW_PT_MASK << SHW_PT_SHIFT);
2775	GCPhysNestedPage \|= (iPte << GUEST_PAGE_SHIFT);
2776	rc = pgmGstSlatWalk(pVCpu, GCPhysNestedPage, false /fIsLinearAddrValid/, 0 /GCPtrNested/, &WalkPt,
2777	&GstWalkPt);
2778	if (RT_SUCCESS(rc))
2779	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPte], WalkPt.GCPhys, pShwPage, iPte, &GstWalkPt);
2780	else
2781	{
2782	/*
2783	* This could be MMIO pages reserved by the nested-hypevisor or genuinely not-present pages.
2784	* Ensure the shadow tables entry is not-present.
2785	*/
2786	/** @todo Potential room for optimization (explained in NestedSyncPT). */
2787	AssertMsg(!pPt->a[iPte].u, ("%RX64\n", pPt->a[iPte].u));
2788	}
2789	Log7Func(("Many: %RGp iPte=%u ShwPte=%RX64\n", GCPhysNestedPage, iPte, SHW_PTE_LOG64(pPt->a[iPte])));
2790	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
2791	break;
2792	}
2793	else
2794	{
2795	# ifdef VBOX_STRICT
2796	/* Paranoia - Verify address of the page is what it should be. */
2797	PGMPTWALKGST GstWalkPt;
2798	PGMPTWALK WalkPt;
2799	GCPhysNestedPage &= ~(SHW_PT_MASK << SHW_PT_SHIFT);
2800	GCPhysNestedPage \|= (iPte << GUEST_PAGE_SHIFT);
2801	rc = pgmGstSlatWalk(pVCpu, GCPhysNestedPage, false /fIsLinearAddrValid/, 0 /GCPtrNested/, &WalkPt, &GstWalkPt);
2802	AssertRC(rc);
2803	PPGMPAGE pPage;
2804	rc = pgmPhysGetPageEx(pVM, WalkPt.GCPhys, &pPage);
2805	AssertRC(rc);
2806	AssertMsg(PGM_PAGE_GET_HCPHYS(pPage) == SHW_PTE_GET_HCPHYS(pPt->a[iPte]),
2807	("PGM page and shadow PTE address conflict. GCPhysNestedPage=%RGp GCPhysPage=%RGp HCPhys=%RHp Shw=%RHp\n",
2808	GCPhysNestedPage, WalkPt.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), SHW_PTE_GET_HCPHYS(pPt->a[iPte])));
2809	# endif
2810	Log7Func(("Many3: %RGp iPte=%u ShwPte=%RX64\n", GCPhysNestedPage, iPte, SHW_PTE_LOG64(pPt->a[iPte])));
2811	}
2812	}
2813	}
2814	else
2815	# endif /* PGM_SYNC_N_PAGES */
2816	{
2817	unsigned const iPte = (GCPhysNestedPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
2818	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPte], GCPhysPage, pShwPage, iPte, pGstWalkAll);
2819	Log7Func(("4K: GCPhysPage=%RGp iPte=%u ShwPte=%08llx\n", GCPhysPage, iPte, SHW_PTE_LOG64(pPt->a[iPte])));
2820	}
2821
2822	return VINF_SUCCESS;
2823	}
2824
2825
2826	/**
2827	* Sync a shadow page table for a nested-guest page table.
2828	*
2829	* The shadow page table is not present in the shadow PDE.
2830	*
2831	* Handles mapping conflicts.
2832	*
2833	* A precondition for this method is that the shadow PDE is not present. The
2834	* caller must take the PGM lock before checking this and continue to hold it
2835	* when calling this method.
2836	*
2837	* @returns VBox status code.
2838	* @param pVCpu The cross context virtual CPU structure.
2839	* @param GCPhysNestedPage The nested-guest physical page address of the page
2840	* being synced.
2841	* @param GCPhysPage The guest-physical address of the page being synced.
2842	* @param pGstWalkAll The guest page table walk result.
2843	*/
2844	static int PGM_BTH_NAME(NestedSyncPT)(PVMCPUCC pVCpu, RTGCPHYS GCPhysNestedPage, RTGCPHYS GCPhysPage, PPGMPTWALKGST pGstWalkAll)
2845	{
2846	PGM_A20_ASSERT_MASKED(pVCpu, GCPhysPage);
2847	Assert(!(GCPhysNestedPage & GUEST_PAGE_OFFSET_MASK));
2848	Assert(!(GCPhysPage & GUEST_PAGE_OFFSET_MASK));
2849
2850	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
2851	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2852
2853	Log7Func(("GCPhysNestedPage=%RGp GCPhysPage=%RGp\n", GCPhysNestedPage, GCPhysPage));
2854
2855	PGM_LOCK_ASSERT_OWNER(pVM);
2856	STAM_PROFILE_START(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
2857
2858	PEPTPD pPd;
2859	PEPTPDPT pPdpt;
2860	unsigned const iPde = (GCPhysNestedPage >> EPT_PD_SHIFT) & EPT_PD_MASK;
2861	int rc = pgmShwGetNestedEPTPDPtr(pVCpu, GCPhysNestedPage, &pPdpt, &pPd, pGstWalkAll);
2862	if (RT_SUCCESS(rc))
2863	{ /* likely */ }
2864	else
2865	{
2866	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
2867	AssertRC(rc);
2868	return rc;
2869	}
2870	Assert(pPd);
2871	PSHWPDE pPde = &pPd->a[iPde];
2872
2873	unsigned const iPdpt = (GCPhysNestedPage >> EPT_PDPT_SHIFT) & EPT_PDPT_MASK;
2874	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdpt->a[iPdpt].u & EPT_PDPTE_PG_MASK);
2875	Assert(pShwPde->enmKind == PGMPOOLKIND_EPT_PD_FOR_EPT_PD);
2876
2877	SHWPDE Pde = *pPde;
2878	Assert(!SHW_PDE_IS_P(Pde)); /* We're only supposed to call SyncPT on PDE!P and conflicts. */
2879
2880	# ifdef PGM_WITH_LARGE_PAGES
2881	Assert(BTH_IS_NP_ACTIVE(pVM));
2882
2883	/*
2884	* Check if the guest is mapping a 2M page.
2885	*/
2886	if (pGstWalkAll->u.Ept.Pde.u & EPT_E_LEAF)
2887	{
2888	PPGMPAGE pPage;
2889	rc = pgmPhysGetPageEx(pVM, GCPhysPage & X86_PDE2M_PAE_PG_MASK, &pPage);
2890	AssertRCReturn(rc, rc);
2891
2892	/* A20 is always enabled in VMX root and non-root operation. */
2893	Assert(PGM_A20_IS_ENABLED(pVCpu));
2894
2895	/*
2896	* Check if we have or can get a 2M backing page here.
2897	*/
2898	RTHCPHYS HCPhys = NIL_RTHCPHYS;
2899	if (PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE)
2900	{
2901	STAM_REL_COUNTER_INC(&pVM->pgm.s.StatLargePageReused);
2902	AssertRelease(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
2903	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
2904	}
2905	else if (PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE_DISABLED)
2906	{
2907	/* Recheck the entire 2 MB range to see if we can use it again as a large page. */
2908	rc = pgmPhysRecheckLargePage(pVM, GCPhysPage, pPage);
2909	if (RT_SUCCESS(rc))
2910	{
2911	Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
2912	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE);
2913	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
2914	}
2915	}
2916	else if (PGMIsUsingLargePages(pVM))
2917	{
2918	rc = pgmPhysAllocLargePage(pVM, GCPhysPage);
2919	if (RT_SUCCESS(rc))
2920	{
2921	Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
2922	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE);
2923	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
2924	}
2925	}
2926
2927	/*
2928	* If we have a 2M backing page, we can map the guest's 2M page right away.
2929	*/
2930	uint64_t const fShwBigPdeFlags = pGstWalkAll->u.Ept.Pde.u & pVCpu->pgm.s.fGstEptShadowedBigPdeMask;
2931	if (HCPhys != NIL_RTHCPHYS)
2932	{
2933	Pde.u = HCPhys \| fShwBigPdeFlags;
2934	Assert(!(Pde.u & pVCpu->pgm.s.fGstEptMbzBigPdeMask));
2935	Assert(Pde.u & EPT_E_LEAF);
2936	SHW_PDE_ATOMIC_SET2(*pPde, Pde);
2937
2938	/* Add a reference to the first page only. */
2939	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPde, PGM_PAGE_GET_TRACKING(pPage), pPage, iPde);
2940
2941	Assert(PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_WRITE_MONITORED);
2942
2943	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
2944	Log7Func(("GstPde=%RGp ShwPde=%RX64 [2M]\n", pGstWalkAll->u.Ept.Pde.u, Pde.u));
2945	return VINF_SUCCESS;
2946	}
2947
2948	/*
2949	* We didn't get a perfect 2M fit. Split the 2M page into 4K pages.
2950	* The page ought not to be marked as a big (2M) page at this point.
2951	*/
2952	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) != PGM_PAGE_PDE_TYPE_PDE);
2953
2954	/* Determine the right kind of large page to avoid incorrect cached entry reuse. */
2955	PGMPOOLACCESS enmAccess;
2956	{
2957	Assert(!(pGstWalkAll->u.Ept.Pde.u & EPT_E_USER_EXECUTE)); /* Mode-based execute control for EPT not supported. */
2958	bool const fNoExecute = !(pGstWalkAll->u.Ept.Pde.u & EPT_E_EXECUTE);
2959	if (pGstWalkAll->u.Ept.Pde.u & EPT_E_WRITE)
2960	enmAccess = fNoExecute ? PGMPOOLACCESS_SUPERVISOR_RW_NX : PGMPOOLACCESS_SUPERVISOR_RW;
2961	else
2962	enmAccess = fNoExecute ? PGMPOOLACCESS_SUPERVISOR_R_NX : PGMPOOLACCESS_SUPERVISOR_R;
2963	}
2964
2965	/*
2966	* Allocate & map a 4K shadow table to cover the 2M guest page.
2967	*/
2968	PPGMPOOLPAGE pShwPage;
2969	RTGCPHYS const GCPhysPt = pGstWalkAll->u.Ept.Pde.u & EPT_PDE2M_PG_MASK;
2970	rc = pgmPoolAlloc(pVM, GCPhysPt, PGMPOOLKIND_EPT_PT_FOR_EPT_2MB, enmAccess, PGM_A20_IS_ENABLED(pVCpu),
2971	pShwPde->idx, iPde, false /fLockPage/, &pShwPage);
2972	if ( rc == VINF_SUCCESS
2973	\|\| rc == VINF_PGM_CACHED_PAGE)
2974	{ /* likely */ }
2975	else
2976	{
2977	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
2978	AssertMsgFailedReturn(("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
2979	}
2980
2981	PSHWPT pPt = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
2982	Assert(pPt);
2983	Assert(PGMPOOL_PAGE_IS_NESTED(pShwPage));
2984	if (rc == VINF_SUCCESS)
2985	{
2986	/* The 4K PTEs shall inherit the flags of the 2M PDE page sans the leaf bit. */
2987	uint64_t const fShwPteFlags = fShwBigPdeFlags & ~EPT_E_LEAF;
2988
2989	/* Sync each 4K pages in the 2M range. */
2990	for (unsigned iPte = 0; iPte < RT_ELEMENTS(pPt->a); iPte++)
2991	{
2992	RTGCPHYS const GCPhysSubPage = GCPhysPt \| (iPte << GUEST_PAGE_SHIFT);
2993	pGstWalkAll->u.Ept.Pte.u = GCPhysSubPage \| fShwPteFlags;
2994	Assert(!(pGstWalkAll->u.Ept.Pte.u & pVCpu->pgm.s.fGstEptMbzPteMask));
2995	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPte], GCPhysSubPage, pShwPage, iPte, pGstWalkAll);
2996	Log7Func(("GstPte=%RGp ShwPte=%RX64 iPte=%u [2M->4K]\n", pGstWalkAll->u.Ept.Pte, pPt->a[iPte].u, iPte));
2997	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
2998	break;
2999	}
3000
3001	/* Restore modifications did to the guest-walk result above in case callers might inspect them later. */
3002	pGstWalkAll->u.Ept.Pte.u = 0;
3003	}
3004	else
3005	{
3006	Assert(rc == VINF_PGM_CACHED_PAGE);
3007	# if defined(VBOX_STRICT) && defined(DEBUG_ramshankar)
3008	/* Paranoia - Verify address of each of the subpages are what they should be. */
3009	RTGCPHYS GCPhysSubPage = GCPhysPt;
3010	for (unsigned iPte = 0; iPte < RT_ELEMENTS(pPt->a); iPte++, GCPhysSubPage += GUEST_PAGE_SIZE)
3011	{
3012	PPGMPAGE pSubPage;
3013	rc = pgmPhysGetPageEx(pVM, GCPhysSubPage, &pSubPage);
3014	AssertRC(rc);
3015	AssertMsg( PGM_PAGE_GET_HCPHYS(pSubPage) == SHW_PTE_GET_HCPHYS(pPt->a[iPte])
3016	\|\| !SHW_PTE_IS_P(pPt->a[iPte]),
3017	("PGM 2M page and shadow PTE conflict. GCPhysSubPage=%RGp Page=%RHp Shw=%RHp\n",
3018	GCPhysSubPage, PGM_PAGE_GET_HCPHYS(pSubPage), SHW_PTE_GET_HCPHYS(pPt->a[iPte])));
3019	}
3020	# endif
3021	rc = VINF_SUCCESS; /* Cached entry; assume it's still fully valid. */
3022	}
3023
3024	/* Save the new PDE. */
3025	uint64_t const fShwPdeFlags = pGstWalkAll->u.Ept.Pde.u & pVCpu->pgm.s.fGstEptShadowedPdeMask;
3026	Pde.u = pShwPage->Core.Key \| fShwPdeFlags;
3027	Assert(!(Pde.u & EPT_E_LEAF));
3028	Assert(!(Pde.u & pVCpu->pgm.s.fGstEptMbzPdeMask));
3029	SHW_PDE_ATOMIC_SET2(*pPde, Pde);
3030	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3031	Log7Func(("GstPde=%RGp ShwPde=%RX64 iPde=%u\n", pGstWalkAll->u.Ept.Pde.u, pPde->u, iPde));
3032	return rc;
3033	}
3034	# endif /* PGM_WITH_LARGE_PAGES */
3035
3036	/*
3037	* Allocate & map the shadow page table.
3038	*/
3039	PSHWPT pPt;
3040	PPGMPOOLPAGE pShwPage;
3041
3042	RTGCPHYS const GCPhysPt = pGstWalkAll->u.Ept.Pde.u & EPT_PDE_PG_MASK;
3043	rc = pgmPoolAlloc(pVM, GCPhysPt, PGMPOOLKIND_EPT_PT_FOR_EPT_PT, PGMPOOLACCESS_DONTCARE,
3044	PGM_A20_IS_ENABLED(pVCpu), pShwPde->idx, iPde, false /fLockPage/, &pShwPage);
3045	if ( rc == VINF_SUCCESS
3046	\|\| rc == VINF_PGM_CACHED_PAGE)
3047	{ /* likely */ }
3048	else
3049	{
3050	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3051	AssertMsgFailedReturn(("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
3052	}
3053
3054	pPt = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
3055	Assert(pPt);
3056	Assert(PGMPOOL_PAGE_IS_NESTED(pShwPage));
3057
3058	if (rc == VINF_SUCCESS)
3059	{
3060	/* Sync the page we've already translated through SLAT. */
3061	const unsigned iPte = (GCPhysNestedPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
3062	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPte], GCPhysPage, pShwPage, iPte, pGstWalkAll);
3063	Log7Func(("GstPte=%RGp ShwPte=%RX64 iPte=%u\n", pGstWalkAll->u.Ept.Pte.u, pPt->a[iPte].u, iPte));
3064
3065	/* Sync the rest of page table (expensive but might be cheaper than nested-guest VM-exits in hardware). */
3066	for (unsigned iPteCur = 0; iPteCur < RT_ELEMENTS(pPt->a); iPteCur++)
3067	{
3068	if (iPteCur != iPte)
3069	{
3070	PGMPTWALKGST GstWalkPt;
3071	PGMPTWALK WalkPt;
3072	GCPhysNestedPage &= ~(SHW_PT_MASK << SHW_PT_SHIFT);
3073	GCPhysNestedPage \|= (iPteCur << GUEST_PAGE_SHIFT);
3074	int const rc2 = pgmGstSlatWalk(pVCpu, GCPhysNestedPage, false /fIsLinearAddrValid/, 0 /GCPtrNested/,
3075	&WalkPt, &GstWalkPt);
3076	if (RT_SUCCESS(rc2))
3077	{
3078	PGM_BTH_NAME(NestedSyncPageWorker)(pVCpu, &pPt->a[iPteCur], WalkPt.GCPhys, pShwPage, iPteCur, &GstWalkPt);
3079	Log7Func(("GstPte=%RGp ShwPte=%RX64 iPte=%u\n", GstWalkPt.u.Ept.Pte.u, pPt->a[iPteCur].u, iPteCur));
3080	}
3081	else
3082	{
3083	/*
3084	* This could be MMIO pages reserved by the nested-hypevisor or genuinely not-present pages.
3085	* Ensure the shadow tables entry is not-present.
3086	*/
3087	/** @todo We currently don't configure these to cause EPT misconfigs but rather trap
3088	* them using EPT violations and walk the guest EPT tables to determine
3089	* whether they are EPT misconfigs VM-exits for the nested-hypervisor. We
3090	* could optimize this by using a specific combination of reserved bits
3091	* which we could immediately identify as EPT misconfigs of the
3092	* nested-hypervisor without having to walk its EPT tables. However, tracking
3093	* non-present entries might be tricky...
3094	*/
3095	AssertMsg(!pPt->a[iPteCur].u, ("%RX64\n", pPt->a[iPteCur].u));
3096	}
3097	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
3098	break;
3099	}
3100	}
3101	}
3102	else
3103	{
3104	Assert(rc == VINF_PGM_CACHED_PAGE);
3105	# if defined(VBOX_STRICT) && defined(DEBUG_ramshankar)
3106	/* Paranoia - Verify address of the page is what it should be. */
3107	PPGMPAGE pPage;
3108	rc = pgmPhysGetPageEx(pVM, GCPhysPage, &pPage);
3109	AssertRC(rc);
3110	const unsigned iPte = (GCPhysNestedPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
3111	AssertMsg(PGM_PAGE_GET_HCPHYS(pPage) == SHW_PTE_GET_HCPHYS(pPt->a[iPte]) \|\| !SHW_PTE_IS_P(pPt->a[iPte]),
3112	("PGM page and shadow PTE address conflict. GCPhysNestedPage=%RGp GCPhysPage=%RGp Page=%RHp Shw=%RHp\n",
3113	GCPhysNestedPage, GCPhysPage, PGM_PAGE_GET_HCPHYS(pPage), SHW_PTE_GET_HCPHYS(pPt->a[iPte])));
3114	Log7Func(("GstPte=%RGp ShwPte=%RX64 iPte=%u [cache]\n", pGstWalkAll->u.Ept.Pte.u, pPt->a[iPte].u, iPte));
3115	# endif
3116	rc = VINF_SUCCESS; /* Cached entry; assume it's still fully valid. */
3117	}
3118
3119	/* Save the new PDE. */
3120	uint64_t const fShwPdeFlags = pGstWalkAll->u.Ept.Pde.u & pVCpu->pgm.s.fGstEptShadowedPdeMask;
3121	Assert(!(pGstWalkAll->u.Ept.Pde.u & EPT_E_LEAF));
3122	Assert(!(pGstWalkAll->u.Ept.Pde.u & pVCpu->pgm.s.fGstEptMbzPdeMask));
3123	Pde.u = pShwPage->Core.Key \| fShwPdeFlags;
3124	SHW_PDE_ATOMIC_SET2(*pPde, Pde);
3125	Log7Func(("GstPde=%RGp ShwPde=%RX64 iPde=%u\n", pGstWalkAll->u.Ept.Pde.u, pPde->u, iPde));
3126
3127	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3128	return rc;
3129	}
3130
3131	#endif /* !IN_RING3 && VBOX_WITH_NESTED_HWVIRT_VMX_EPT && PGM_SHW_TYPE == PGM_TYPE_EPT*/
3132	#if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE
3133
3134	/**
3135	* Handle dirty bit tracking faults.
3136	*
3137	* @returns VBox status code.
3138	* @param pVCpu The cross context virtual CPU structure.
3139	* @param uErr Page fault error code.
3140	* @param pPdeSrc Guest page directory entry.
3141	* @param pPdeDst Shadow page directory entry.
3142	* @param GCPtrPage Guest context page address.
3143	*/
3144	static int PGM_BTH_NAME(CheckDirtyPageFault)(PVMCPUCC pVCpu, uint32_t uErr, PSHWPDE pPdeDst, GSTPDE const *pPdeSrc,
3145	RTGCPTR GCPtrPage)
3146	{
3147	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
3148	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3149	NOREF(uErr);
3150
3151	PGM_LOCK_ASSERT_OWNER(pVM);
3152
3153	/*
3154	* Handle big page.
3155	*/
3156	if ((pPdeSrc->u & X86_PDE_PS) && GST_IS_PSE_ACTIVE(pVCpu))
3157	{
3158	if ((pPdeDst->u & (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY)) == (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY))
3159	{
3160	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageTrap));
3161	Assert(pPdeSrc->u & X86_PDE_RW);
3162
3163	/* Note: No need to invalidate this entry on other VCPUs as a stale TLB entry will not harm; write access will simply
3164	* fault again and take this path to only invalidate the entry (see below). */
3165	SHWPDE PdeDst = *pPdeDst;
3166	PdeDst.u &= ~(SHWUINT)PGM_PDFLAGS_TRACK_DIRTY;
3167	PdeDst.u \|= X86_PDE_RW \| X86_PDE_A;
3168	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3169	PGM_INVL_BIG_PG(pVCpu, GCPtrPage);
3170	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; /* restarts the instruction. */
3171	}
3172
3173	# ifdef IN_RING0
3174	/* Check for stale TLB entry; only applies to the SMP guest case. */
3175	if ( pVM->cCpus > 1
3176	&& (pPdeDst->u & (X86_PDE_P \| X86_PDE_RW \| X86_PDE_A)) == (X86_PDE_P \| X86_PDE_RW \| X86_PDE_A))
3177	{
3178	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, pPdeDst->u & SHW_PDE_PG_MASK);
3179	if (pShwPage)
3180	{
3181	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
3182	PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK];
3183	if (SHW_PTE_IS_P_RW(*pPteDst))
3184	{
3185	/* Stale TLB entry. */
3186	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageStale));
3187	PGM_INVL_PG(pVCpu, GCPtrPage);
3188	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; /* restarts the instruction. */
3189	}
3190	}
3191	}
3192	# endif /* IN_RING0 */
3193	return VINF_PGM_NO_DIRTY_BIT_TRACKING;
3194	}
3195
3196	/*
3197	* Map the guest page table.
3198	*/
3199	PGSTPT pPTSrc;
3200	int rc = PGM_GCPHYS_2_PTR_V2(pVM, pVCpu, GST_GET_PDE_GCPHYS(*pPdeSrc), &pPTSrc);
3201	AssertRCReturn(rc, rc);
3202
3203	if (SHW_PDE_IS_P(*pPdeDst))
3204	{
3205	GSTPTE const *pPteSrc = &pPTSrc->a[(GCPtrPage >> GST_PT_SHIFT) & GST_PT_MASK];
3206	const GSTPTE PteSrc = *pPteSrc;
3207
3208	/*
3209	* Map shadow page table.
3210	*/
3211	PPGMPOOLPAGE pShwPage = pgmPoolGetPage(pPool, pPdeDst->u & SHW_PDE_PG_MASK);
3212	if (pShwPage)
3213	{
3214	PSHWPT pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
3215	PSHWPTE pPteDst = &pPTDst->a[(GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK];
3216	if (SHW_PTE_IS_P(pPteDst)) /* @todo Optimize accessed bit emulation? */
3217	{
3218	if (SHW_PTE_IS_TRACK_DIRTY(*pPteDst))
3219	{
3220	PPGMPAGE pPage = pgmPhysGetPage(pVM, GST_GET_PTE_GCPHYS(PteSrc));
3221	SHWPTE PteDst = *pPteDst;
3222
3223	LogFlow(("DIRTY page trap addr=%RGv\n", GCPtrPage));
3224	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageTrap));
3225
3226	Assert(PteSrc.u & X86_PTE_RW);
3227
3228	/* Note: No need to invalidate this entry on other VCPUs as a stale TLB
3229	* entry will not harm; write access will simply fault again and
3230	* take this path to only invalidate the entry.
3231	*/
3232	if (RT_LIKELY(pPage))
3233	{
3234	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) && !PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
3235	{
3236	//AssertMsgFailed(("%R[pgmpage] - we don't set PGM_PTFLAGS_TRACK_DIRTY for these pages\n", pPage));
3237	Assert(!PGM_PAGE_HAS_ACTIVE_ALL_HANDLERS(pPage));
3238	/* Assuming write handlers here as the PTE is present (otherwise we wouldn't be here). */
3239	SHW_PTE_SET_RO(PteDst);
3240	}
3241	else
3242	{
3243	if ( PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_WRITE_MONITORED
3244	&& PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM)
3245	{
3246	rc = pgmPhysPageMakeWritable(pVM, pPage, GST_GET_PTE_GCPHYS(PteSrc));
3247	AssertRC(rc);
3248	}
3249	if (PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED)
3250	SHW_PTE_SET_RW(PteDst);
3251	else
3252	{
3253	/* Still applies to shared pages. */
3254	Assert(!PGM_PAGE_IS_ZERO(pPage));
3255	SHW_PTE_SET_RO(PteDst);
3256	}
3257	}
3258	}
3259	else
3260	SHW_PTE_SET_RW(PteDst); /** @todo r=bird: This doesn't make sense to me. */
3261
3262	SHW_PTE_SET(PteDst, (SHW_PTE_GET_U(PteDst) \| X86_PTE_D \| X86_PTE_A) & ~(uint64_t)PGM_PTFLAGS_TRACK_DIRTY);
3263	SHW_PTE_ATOMIC_SET2(*pPteDst, PteDst);
3264	PGM_INVL_PG(pVCpu, GCPtrPage);
3265	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; /* restarts the instruction. */
3266	}
3267
3268	# ifdef IN_RING0
3269	/* Check for stale TLB entry; only applies to the SMP guest case. */
3270	if ( pVM->cCpus > 1
3271	&& SHW_PTE_IS_RW(*pPteDst)
3272	&& SHW_PTE_IS_A(*pPteDst))
3273	{
3274	/* Stale TLB entry. */
3275	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageStale));
3276	PGM_INVL_PG(pVCpu, GCPtrPage);
3277	return VINF_PGM_HANDLED_DIRTY_BIT_FAULT; /* restarts the instruction. */
3278	}
3279	# endif
3280	}
3281	}
3282	else
3283	AssertMsgFailed(("pgmPoolGetPageByHCPhys %RGp failed!\n", pPdeDst->u & SHW_PDE_PG_MASK));
3284	}
3285
3286	return VINF_PGM_NO_DIRTY_BIT_TRACKING;
3287	}
3288
3289	#endif /* PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE */
3290
3291	/**
3292	* Sync a shadow page table.
3293	*
3294	* The shadow page table is not present in the shadow PDE.
3295	*
3296	* Handles mapping conflicts.
3297	*
3298	* This is called by VerifyAccessSyncPage, PrefetchPage, InvalidatePage (on
3299	* conflict), and Trap0eHandler.
3300	*
3301	* A precondition for this method is that the shadow PDE is not present. The
3302	* caller must take the PGM lock before checking this and continue to hold it
3303	* when calling this method.
3304	*
3305	* @returns VBox status code.
3306	* @param pVCpu The cross context virtual CPU structure.
3307	* @param iPDSrc Page directory index.
3308	* @param pPDSrc Source page directory (i.e. Guest OS page directory).
3309	* Assume this is a temporary mapping.
3310	* @param GCPtrPage GC Pointer of the page that caused the fault
3311	*/
3312	static int PGM_BTH_NAME(SyncPT)(PVMCPUCC pVCpu, unsigned iPDSrc, PGSTPD pPDSrc, RTGCPTR GCPtrPage)
3313	{
3314	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
3315	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
3316
3317	#if 0 /* rarely useful; leave for debugging. */
3318	STAM_COUNTER_INC(&pVCpu->pgm.s.StatSyncPtPD[iPDSrc]);
3319	#endif
3320	LogFlow(("SyncPT: GCPtrPage=%RGv\n", GCPtrPage)); RT_NOREF_PV(GCPtrPage);
3321
3322	PGM_LOCK_ASSERT_OWNER(pVM);
3323
3324	#if ( PGM_GST_TYPE == PGM_TYPE_32BIT \
3325	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
3326	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64) \
3327	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \
3328	&& PGM_SHW_TYPE != PGM_TYPE_NONE
3329	int rc = VINF_SUCCESS;
3330
3331	STAM_PROFILE_START(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3332
3333	/*
3334	* Some input validation first.
3335	*/
3336	AssertMsg(iPDSrc == ((GCPtrPage >> GST_PD_SHIFT) & GST_PD_MASK), ("iPDSrc=%x GCPtrPage=%RGv\n", iPDSrc, GCPtrPage));
3337
3338	/*
3339	* Get the relevant shadow PDE entry.
3340	*/
3341	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
3342	const unsigned iPDDst = GCPtrPage >> SHW_PD_SHIFT;
3343	PSHWPDE pPdeDst = pgmShwGet32BitPDEPtr(pVCpu, GCPtrPage);
3344
3345	/* Fetch the pgm pool shadow descriptor. */
3346	PPGMPOOLPAGE pShwPde = pVCpu->pgm.s.CTX_SUFF(pShwPageCR3);
3347	Assert(pShwPde);
3348
3349	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
3350	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
3351	PPGMPOOLPAGE pShwPde = NULL;
3352	PX86PDPAE pPDDst;
3353	PSHWPDE pPdeDst;
3354
3355	/* Fetch the pgm pool shadow descriptor. */
3356	rc = pgmShwGetPaePoolPagePD(pVCpu, GCPtrPage, &pShwPde);
3357	AssertRCSuccessReturn(rc, rc);
3358	Assert(pShwPde);
3359
3360	pPDDst = (PX86PDPAE)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPde);
3361	pPdeDst = &pPDDst->a[iPDDst];
3362
3363	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
3364	const unsigned iPdpt = (GCPtrPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
3365	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
3366	PX86PDPAE pPDDst = NULL; /* initialized to shut up gcc */
3367	PX86PDPT pPdptDst = NULL; /* initialized to shut up gcc */
3368	rc = pgmShwGetLongModePDPtr(pVCpu, GCPtrPage, NULL, &pPdptDst, &pPDDst);
3369	AssertRCSuccessReturn(rc, rc);
3370	Assert(pPDDst);
3371	PSHWPDE pPdeDst = &pPDDst->a[iPDDst];
3372
3373	# endif
3374	SHWPDE PdeDst = *pPdeDst;
3375
3376	# if PGM_GST_TYPE == PGM_TYPE_AMD64
3377	/* Fetch the pgm pool shadow descriptor. */
3378	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & X86_PDPE_PG_MASK);
3379	Assert(pShwPde);
3380	# endif
3381
3382	Assert(!SHW_PDE_IS_P(PdeDst)); /* We're only supposed to call SyncPT on PDE!P.*/
3383
3384	/*
3385	* Sync the page directory entry.
3386	*/
3387	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
3388	const bool fPageTable = !(PdeSrc.u & X86_PDE_PS) \|\| !GST_IS_PSE_ACTIVE(pVCpu);
3389	if ( (PdeSrc.u & X86_PDE_P)
3390	&& (fPageTable ? GST_IS_PDE_VALID(pVCpu, PdeSrc) : GST_IS_BIG_PDE_VALID(pVCpu, PdeSrc)) )
3391	{
3392	/*
3393	* Allocate & map the page table.
3394	*/
3395	PSHWPT pPTDst;
3396	PPGMPOOLPAGE pShwPage;
3397	RTGCPHYS GCPhys;
3398	if (fPageTable)
3399	{
3400	GCPhys = GST_GET_PDE_GCPHYS(PdeSrc);
3401	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3402	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
3403	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| ((iPDDst & 1) * (GUEST_PAGE_SIZE / 2)));
3404	# endif
3405	rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_PT, PGMPOOLACCESS_DONTCARE, PGM_A20_IS_ENABLED(pVCpu),
3406	pShwPde->idx, iPDDst, false /fLockPage/,
3407	&pShwPage);
3408	}
3409	else
3410	{
3411	PGMPOOLACCESS enmAccess;
3412	# if PGM_WITH_NX(PGM_GST_TYPE, PGM_SHW_TYPE)
3413	const bool fNoExecute = (PdeSrc.u & X86_PDE_PAE_NX) && GST_IS_NX_ACTIVE(pVCpu);
3414	# else
3415	const bool fNoExecute = false;
3416	# endif
3417
3418	GCPhys = GST_GET_BIG_PDE_GCPHYS(pVM, PdeSrc);
3419	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3420	/* Select the right PDE as we're emulating a 4MB page directory with two 2 MB shadow PDEs.*/
3421	GCPhys = PGM_A20_APPLY(pVCpu, GCPhys \| (GCPtrPage & (1 << X86_PD_PAE_SHIFT)));
3422	# endif
3423	/* Determine the right kind of large page to avoid incorrect cached entry reuse. */
3424	if (PdeSrc.u & X86_PDE_US)
3425	{
3426	if (PdeSrc.u & X86_PDE_RW)
3427	enmAccess = (fNoExecute) ? PGMPOOLACCESS_USER_RW_NX : PGMPOOLACCESS_USER_RW;
3428	else
3429	enmAccess = (fNoExecute) ? PGMPOOLACCESS_USER_R_NX : PGMPOOLACCESS_USER_R;
3430	}
3431	else
3432	{
3433	if (PdeSrc.u & X86_PDE_RW)
3434	enmAccess = (fNoExecute) ? PGMPOOLACCESS_SUPERVISOR_RW_NX : PGMPOOLACCESS_SUPERVISOR_RW;
3435	else
3436	enmAccess = (fNoExecute) ? PGMPOOLACCESS_SUPERVISOR_R_NX : PGMPOOLACCESS_SUPERVISOR_R;
3437	}
3438	rc = pgmPoolAlloc(pVM, GCPhys, BTH_PGMPOOLKIND_PT_FOR_BIG, enmAccess, PGM_A20_IS_ENABLED(pVCpu),
3439	pShwPde->idx, iPDDst, false /fLockPage/,
3440	&pShwPage);
3441	}
3442	if (rc == VINF_SUCCESS)
3443	pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
3444	else if (rc == VINF_PGM_CACHED_PAGE)
3445	{
3446	/*
3447	* The PT was cached, just hook it up.
3448	*/
3449	if (fPageTable)
3450	PdeDst.u = pShwPage->Core.Key \| GST_GET_PDE_SHW_FLAGS(pVCpu, PdeSrc);
3451	else
3452	{
3453	PdeDst.u = pShwPage->Core.Key \| GST_GET_BIG_PDE_SHW_FLAGS(pVCpu, PdeSrc);
3454	/* (see explanation and assumptions further down.) */
3455	if ((PdeSrc.u & (X86_PDE_RW \| X86_PDE4M_D)) == X86_PDE_RW)
3456	{
3457	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageBig));
3458	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
3459	PdeDst.u &= ~(SHWUINT)X86_PDE_RW;
3460	}
3461	}
3462	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3463	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
3464	return VINF_SUCCESS;
3465	}
3466	else
3467	AssertMsgFailedReturn(("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
3468	/** @todo Why do we bother preserving X86_PDE_AVL_MASK here?
3469	* Both PGM_PDFLAGS_MAPPING and PGM_PDFLAGS_TRACK_DIRTY should be
3470	* irrelevant at this point. */
3471	PdeDst.u &= X86_PDE_AVL_MASK;
3472	PdeDst.u \|= pShwPage->Core.Key;
3473
3474	/*
3475	* Page directory has been accessed (this is a fault situation, remember).
3476	*/
3477	/** @todo
3478	* Well, when the caller is PrefetchPage or InvalidatePage is isn't a
3479	* fault situation. What's more, the Trap0eHandler has already set the
3480	* accessed bit. So, it's actually just VerifyAccessSyncPage which
3481	* might need setting the accessed flag.
3482	*
3483	* The best idea is to leave this change to the caller and add an
3484	* assertion that it's set already. */
3485	pPDSrc->a[iPDSrc].u \|= X86_PDE_A;
3486	if (fPageTable)
3487	{
3488	/*
3489	* Page table - 4KB.
3490	*
3491	* Sync all or just a few entries depending on PGM_SYNC_N_PAGES.
3492	*/
3493	Log2(("SyncPT: 4K %RGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx}\n",
3494	GCPtrPage, PdeSrc.u & X86_PTE_P, !!(PdeSrc.u & X86_PTE_RW), !!(PdeSrc.u & X86_PDE_US), (uint64_t)PdeSrc.u));
3495	PGSTPT pPTSrc;
3496	rc = PGM_GCPHYS_2_PTR(pVM, GST_GET_PDE_GCPHYS(PdeSrc), &pPTSrc);
3497	if (RT_SUCCESS(rc))
3498	{
3499	/*
3500	* Start by syncing the page directory entry so CSAM's TLB trick works.
3501	*/
3502	PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK \| X86_PDE_AVL_MASK))
3503	\| GST_GET_PDE_SHW_FLAGS(pVCpu, PdeSrc);
3504	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3505	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
3506
3507	/*
3508	* Directory/page user or supervisor privilege: (same goes for read/write)
3509	*
3510	* Directory Page Combined
3511	* U/S U/S U/S
3512	* 0 0 0
3513	* 0 1 0
3514	* 1 0 0
3515	* 1 1 1
3516	*
3517	* Simple AND operation. Table listed for completeness.
3518	*
3519	*/
3520	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT4K));
3521	# ifdef PGM_SYNC_N_PAGES
3522	unsigned iPTBase = (GCPtrPage >> SHW_PT_SHIFT) & SHW_PT_MASK;
3523	unsigned iPTDst = iPTBase;
3524	const unsigned iPTDstEnd = RT_MIN(iPTDst + PGM_SYNC_NR_PAGES / 2, RT_ELEMENTS(pPTDst->a));
3525	if (iPTDst <= PGM_SYNC_NR_PAGES / 2)
3526	iPTDst = 0;
3527	else
3528	iPTDst -= PGM_SYNC_NR_PAGES / 2;
3529	# else /* !PGM_SYNC_N_PAGES */
3530	unsigned iPTDst = 0;
3531	const unsigned iPTDstEnd = RT_ELEMENTS(pPTDst->a);
3532	# endif /* !PGM_SYNC_N_PAGES */
3533	RTGCPTR GCPtrCur = (GCPtrPage & ~(RTGCPTR)((1 << SHW_PD_SHIFT) - 1))
3534	\| ((RTGCPTR)iPTDst << GUEST_PAGE_SHIFT);
3535	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
3536	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
3537	const unsigned offPTSrc = ((GCPtrPage >> SHW_PD_SHIFT) & 1) * 512;
3538	# else
3539	const unsigned offPTSrc = 0;
3540	# endif
3541	for (; iPTDst < iPTDstEnd; iPTDst++, GCPtrCur += GUEST_PAGE_SIZE)
3542	{
3543	const unsigned iPTSrc = iPTDst + offPTSrc;
3544	const GSTPTE PteSrc = pPTSrc->a[iPTSrc];
3545	if (PteSrc.u & X86_PTE_P)
3546	{
3547	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], PdeSrc, PteSrc, pShwPage, iPTDst);
3548	Log2(("SyncPT: 4K+ %RGv PteSrc:{P=%d RW=%d U=%d raw=%08llx}%s dst.raw=%08llx iPTSrc=%x PdeSrc.u=%x physpte=%RGp\n",
3549	GCPtrCur,
3550	PteSrc.u & X86_PTE_P,
3551	!!(PteSrc.u & PdeSrc.u & X86_PTE_RW),
3552	!!(PteSrc.u & PdeSrc.u & X86_PTE_US),
3553	(uint64_t)PteSrc.u,
3554	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : "", SHW_PTE_LOG64(pPTDst->a[iPTDst]), iPTSrc, PdeSrc.au32[0],
3555	(RTGCPHYS)(GST_GET_PDE_GCPHYS(PdeSrc) + iPTSrc*sizeof(PteSrc)) ));
3556	}
3557	/* else: the page table was cleared by the pool */
3558	} /* for PTEs */
3559	}
3560	}
3561	else
3562	{
3563	/*
3564	* Big page - 2/4MB.
3565	*
3566	* We'll walk the ram range list in parallel and optimize lookups.
3567	* We will only sync one shadow page table at a time.
3568	*/
3569	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT4M));
3570
3571	/**
3572	* @todo It might be more efficient to sync only a part of the 4MB
3573	* page (similar to what we do for 4KB PDs).
3574	*/
3575
3576	/*
3577	* Start by syncing the page directory entry.
3578	*/
3579	PdeDst.u = (PdeDst.u & (SHW_PDE_PG_MASK \| (X86_PDE_AVL_MASK & ~PGM_PDFLAGS_TRACK_DIRTY)))
3580	\| GST_GET_BIG_PDE_SHW_FLAGS(pVCpu, PdeSrc);
3581
3582	/*
3583	* If the page is not flagged as dirty and is writable, then make it read-only
3584	* at PD level, so we can set the dirty bit when the page is modified.
3585	*
3586	* ASSUMES that page access handlers are implemented on page table entry level.
3587	* Thus we will first catch the dirty access and set PDE.D and restart. If
3588	* there is an access handler, we'll trap again and let it work on the problem.
3589	*/
3590	/** @todo move the above stuff to a section in the PGM documentation. */
3591	Assert(!(PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY));
3592	if ((PdeSrc.u & (X86_PDE_RW \| X86_PDE4M_D)) == X86_PDE_RW)
3593	{
3594	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,DirtyPageBig));
3595	PdeDst.u \|= PGM_PDFLAGS_TRACK_DIRTY;
3596	PdeDst.u &= ~(SHWUINT)X86_PDE_RW;
3597	}
3598	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3599	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
3600
3601	/*
3602	* Fill the shadow page table.
3603	*/
3604	/* Get address and flags from the source PDE. */
3605	SHWPTE PteDstBase;
3606	SHW_PTE_SET(PteDstBase, GST_GET_BIG_PDE_SHW_FLAGS_4_PTE(pVCpu, PdeSrc));
3607
3608	/* Loop thru the entries in the shadow PT. */
3609	const RTGCPTR GCPtr = (GCPtrPage >> SHW_PD_SHIFT) << SHW_PD_SHIFT; NOREF(GCPtr);
3610	Log2(("SyncPT: BIG %RGv PdeSrc:{P=%d RW=%d U=%d raw=%08llx} Shw=%RGv GCPhys=%RGp %s\n",
3611	GCPtrPage, PdeSrc.u & X86_PDE_P, !!(PdeSrc.u & X86_PDE_RW), !!(PdeSrc.u & X86_PDE_US), (uint64_t)PdeSrc.u, GCPtr,
3612	GCPhys, PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY ? " Track-Dirty" : ""));
3613	PPGMRAMRANGE pRam = pgmPhysGetRangeAtOrAbove(pVM, GCPhys);
3614	unsigned iPTDst = 0;
3615	while ( iPTDst < RT_ELEMENTS(pPTDst->a)
3616	&& !VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
3617	{
3618	if (pRam && GCPhys >= pRam->GCPhys)
3619	{
3620	# ifndef PGM_WITH_A20
3621	unsigned iHCPage = (GCPhys - pRam->GCPhys) >> GUEST_PAGE_SHIFT;
3622	# endif
3623	do
3624	{
3625	/* Make shadow PTE. */
3626	# ifdef PGM_WITH_A20
3627	PPGMPAGE pPage = &pRam->aPages[(GCPhys - pRam->GCPhys) >> GUEST_PAGE_SHIFT];
3628	# else
3629	PPGMPAGE pPage = &pRam->aPages[iHCPage];
3630	# endif
3631	SHWPTE PteDst;
3632
3633	# ifndef VBOX_WITH_NEW_LAZY_PAGE_ALLOC
3634	/* Try to make the page writable if necessary. */
3635	if ( PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM
3636	&& ( PGM_PAGE_IS_ZERO(pPage)
3637	\|\| ( SHW_PTE_IS_RW(PteDstBase)
3638	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED
3639	# ifdef VBOX_WITH_REAL_WRITE_MONITORED_PAGES
3640	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_WRITE_MONITORED
3641	# endif
3642	# ifdef VBOX_WITH_PAGE_SHARING
3643	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_SHARED
3644	# endif
3645	&& !PGM_PAGE_IS_BALLOONED(pPage))
3646	)
3647	)
3648	{
3649	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhys);
3650	AssertRCReturn(rc, rc);
3651	if (VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
3652	break;
3653	}
3654	# endif
3655
3656	if (PGM_PAGE_HAS_ACTIVE_HANDLERS(pPage) && !PGM_PAGE_IS_HNDL_PHYS_NOT_IN_HM(pPage))
3657	PGM_BTH_NAME(SyncHandlerPte)(pVM, pVCpu, pPage, GCPhys, SHW_PTE_GET_U(PteDstBase), &PteDst);
3658	else if (PGM_PAGE_IS_BALLOONED(pPage))
3659	SHW_PTE_SET(PteDst, 0); /* Handle ballooned pages at #PF time. */
3660	else
3661	SHW_PTE_SET(PteDst, PGM_PAGE_GET_HCPHYS(pPage) \| SHW_PTE_GET_U(PteDstBase));
3662
3663	/* Only map writable pages writable. */
3664	if ( SHW_PTE_IS_P_RW(PteDst)
3665	&& PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED)
3666	{
3667	/* Still applies to shared pages. */
3668	Assert(!PGM_PAGE_IS_ZERO(pPage));
3669	SHW_PTE_SET_RO(PteDst); /** @todo this isn't quite working yet... */
3670	Log3(("SyncPT: write-protecting %RGp pPage=%R[pgmpage] at %RGv\n", GCPhys, pPage, (RTGCPTR)(GCPtr \| (iPTDst << SHW_PT_SHIFT))));
3671	}
3672
3673	if (SHW_PTE_IS_P(PteDst))
3674	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPage, PGM_PAGE_GET_TRACKING(pPage), pPage, iPTDst);
3675
3676	/* commit it (not atomic, new table) */
3677	pPTDst->a[iPTDst] = PteDst;
3678	Log4(("SyncPT: BIG %RGv PteDst:{P=%d RW=%d U=%d raw=%08llx}%s\n",
3679	(RTGCPTR)(GCPtr \| (iPTDst << SHW_PT_SHIFT)), SHW_PTE_IS_P(PteDst), SHW_PTE_IS_RW(PteDst), SHW_PTE_IS_US(PteDst), SHW_PTE_LOG64(PteDst),
3680	SHW_PTE_IS_TRACK_DIRTY(PteDst) ? " Track-Dirty" : ""));
3681
3682	/* advance */
3683	GCPhys += GUEST_PAGE_SIZE;
3684	PGM_A20_APPLY_TO_VAR(pVCpu, GCPhys);
3685	# ifndef PGM_WITH_A20
3686	iHCPage++;
3687	# endif
3688	iPTDst++;
3689	} while ( iPTDst < RT_ELEMENTS(pPTDst->a)
3690	&& GCPhys <= pRam->GCPhysLast);
3691
3692	/* Advance ram range list. */
3693	while (pRam && GCPhys > pRam->GCPhysLast)
3694	pRam = pRam->CTX_SUFF(pNext);
3695	}
3696	else if (pRam)
3697	{
3698	Log(("Invalid pages at %RGp\n", GCPhys));
3699	do
3700	{
3701	SHW_PTE_SET(pPTDst->a[iPTDst], 0); /* Invalid page, we must handle them manually. */
3702	GCPhys += GUEST_PAGE_SIZE;
3703	iPTDst++;
3704	} while ( iPTDst < RT_ELEMENTS(pPTDst->a)
3705	&& GCPhys < pRam->GCPhys);
3706	PGM_A20_APPLY_TO_VAR(pVCpu,GCPhys);
3707	}
3708	else
3709	{
3710	Log(("Invalid pages at %RGp (2)\n", GCPhys));
3711	for ( ; iPTDst < RT_ELEMENTS(pPTDst->a); iPTDst++)
3712	SHW_PTE_SET(pPTDst->a[iPTDst], 0); /* Invalid page, we must handle them manually. */
3713	}
3714	} /* while more PTEs */
3715	} /* 4KB / 4MB */
3716	}
3717	else
3718	AssertRelease(!SHW_PDE_IS_P(PdeDst));
3719
3720	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3721	if (RT_FAILURE(rc))
3722	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPTFailed));
3723	return rc;
3724
3725	#elif (PGM_GST_TYPE == PGM_TYPE_REAL \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
3726	&& !PGM_TYPE_IS_NESTED(PGM_SHW_TYPE) \
3727	&& (PGM_SHW_TYPE != PGM_TYPE_EPT \|\| PGM_GST_TYPE == PGM_TYPE_PROT) \
3728	&& PGM_SHW_TYPE != PGM_TYPE_NONE
3729	NOREF(iPDSrc); NOREF(pPDSrc);
3730
3731	STAM_PROFILE_START(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3732
3733	/*
3734	* Validate input a little bit.
3735	*/
3736	int rc = VINF_SUCCESS;
3737	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
3738	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
3739	PSHWPDE pPdeDst = pgmShwGet32BitPDEPtr(pVCpu, GCPtrPage);
3740
3741	/* Fetch the pgm pool shadow descriptor. */
3742	PPGMPOOLPAGE pShwPde = pVCpu->pgm.s.CTX_SUFF(pShwPageCR3);
3743	Assert(pShwPde);
3744
3745	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
3746	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
3747	PPGMPOOLPAGE pShwPde = NULL; /* initialized to shut up gcc */
3748	PX86PDPAE pPDDst;
3749	PSHWPDE pPdeDst;
3750
3751	/* Fetch the pgm pool shadow descriptor. */
3752	rc = pgmShwGetPaePoolPagePD(pVCpu, GCPtrPage, &pShwPde);
3753	AssertRCSuccessReturn(rc, rc);
3754	Assert(pShwPde);
3755
3756	pPDDst = (PX86PDPAE)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPde);
3757	pPdeDst = &pPDDst->a[iPDDst];
3758
3759	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
3760	const unsigned iPdpt = (GCPtrPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
3761	const unsigned iPDDst = (GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK;
3762	PX86PDPAE pPDDst = NULL; /* initialized to shut up gcc */
3763	PX86PDPT pPdptDst= NULL; /* initialized to shut up gcc */
3764	rc = pgmShwGetLongModePDPtr(pVCpu, GCPtrPage, NULL, &pPdptDst, &pPDDst);
3765	AssertRCSuccessReturn(rc, rc);
3766	Assert(pPDDst);
3767	PSHWPDE pPdeDst = &pPDDst->a[iPDDst];
3768
3769	/* Fetch the pgm pool shadow descriptor. */
3770	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & X86_PDPE_PG_MASK);
3771	Assert(pShwPde);
3772
3773	# elif PGM_SHW_TYPE == PGM_TYPE_EPT
3774	const unsigned iPdpt = (GCPtrPage >> EPT_PDPT_SHIFT) & EPT_PDPT_MASK;
3775	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
3776	PEPTPD pPDDst;
3777	PEPTPDPT pPdptDst;
3778
3779	rc = pgmShwGetEPTPDPtr(pVCpu, GCPtrPage, &pPdptDst, &pPDDst);
3780	if (rc != VINF_SUCCESS)
3781	{
3782	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3783	AssertRC(rc);
3784	return rc;
3785	}
3786	Assert(pPDDst);
3787	PSHWPDE pPdeDst = &pPDDst->a[iPDDst];
3788
3789	/* Fetch the pgm pool shadow descriptor. */
3790	/** @todo r=bird: didn't pgmShwGetEPTPDPtr just do this lookup already? */
3791	PPGMPOOLPAGE pShwPde = pgmPoolGetPage(pPool, pPdptDst->a[iPdpt].u & EPT_PDPTE_PG_MASK);
3792	Assert(pShwPde);
3793	# endif
3794	SHWPDE PdeDst = *pPdeDst;
3795
3796	Assert(!SHW_PDE_IS_P(PdeDst)); /* We're only supposed to call SyncPT on PDE!P and conflicts.*/
3797
3798	# if defined(PGM_WITH_LARGE_PAGES) && PGM_SHW_TYPE != PGM_TYPE_32BIT && PGM_SHW_TYPE != PGM_TYPE_PAE
3799	if (BTH_IS_NP_ACTIVE(pVM))
3800	{
3801	Assert(!VM_IS_NEM_ENABLED(pVM));
3802
3803	/* Check if we allocated a big page before for this 2 MB range. */
3804	PPGMPAGE pPage;
3805	rc = pgmPhysGetPageEx(pVM, PGM_A20_APPLY(pVCpu, GCPtrPage & X86_PDE2M_PAE_PG_MASK), &pPage);
3806	if (RT_SUCCESS(rc))
3807	{
3808	RTHCPHYS HCPhys = NIL_RTHCPHYS;
3809	if (PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE)
3810	{
3811	if (PGM_A20_IS_ENABLED(pVCpu))
3812	{
3813	STAM_REL_COUNTER_INC(&pVM->pgm.s.StatLargePageReused);
3814	AssertRelease(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
3815	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
3816	}
3817	else
3818	{
3819	PGM_PAGE_SET_PDE_TYPE(pVM, pPage, PGM_PAGE_PDE_TYPE_PDE_DISABLED);
3820	pVM->pgm.s.cLargePagesDisabled++;
3821	}
3822	}
3823	else if ( PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE_DISABLED
3824	&& PGM_A20_IS_ENABLED(pVCpu))
3825	{
3826	/* Recheck the entire 2 MB range to see if we can use it again as a large page. */
3827	rc = pgmPhysRecheckLargePage(pVM, GCPtrPage, pPage);
3828	if (RT_SUCCESS(rc))
3829	{
3830	Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
3831	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE);
3832	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
3833	}
3834	}
3835	else if ( PGMIsUsingLargePages(pVM)
3836	&& PGM_A20_IS_ENABLED(pVCpu))
3837	{
3838	rc = pgmPhysAllocLargePage(pVM, GCPtrPage);
3839	if (RT_SUCCESS(rc))
3840	{
3841	Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
3842	Assert(PGM_PAGE_GET_PDE_TYPE(pPage) == PGM_PAGE_PDE_TYPE_PDE);
3843	HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
3844	}
3845	else
3846	LogFlow(("pgmPhysAllocLargePage failed with %Rrc\n", rc));
3847	}
3848
3849	if (HCPhys != NIL_RTHCPHYS)
3850	{
3851	# if PGM_SHW_TYPE == PGM_TYPE_EPT
3852	PdeDst.u = HCPhys \| EPT_E_READ \| EPT_E_WRITE \| EPT_E_EXECUTE \| EPT_E_LEAF \| EPT_E_IGNORE_PAT \| EPT_E_MEMTYPE_WB
3853	\| (PdeDst.u & X86_PDE_AVL_MASK) /** @todo do we need this? */;
3854	# else
3855	PdeDst.u = HCPhys \| X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_PS
3856	\| (PdeDst.u & X86_PDE_AVL_MASK) /** @todo PGM_PD_FLAGS? */;
3857	# endif
3858	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3859
3860	Log(("SyncPT: Use large page at %RGp PDE=%RX64\n", GCPtrPage, PdeDst.u));
3861	/* Add a reference to the first page only. */
3862	PGM_BTH_NAME(SyncPageWorkerTrackAddref)(pVCpu, pShwPde, PGM_PAGE_GET_TRACKING(pPage), pPage, iPDDst);
3863
3864	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3865	return VINF_SUCCESS;
3866	}
3867	}
3868	}
3869	# endif /* defined(PGM_WITH_LARGE_PAGES) && PGM_SHW_TYPE != PGM_TYPE_32BIT && PGM_SHW_TYPE != PGM_TYPE_PAE */
3870
3871	/*
3872	* Allocate & map the page table.
3873	*/
3874	PSHWPT pPTDst;
3875	PPGMPOOLPAGE pShwPage;
3876	RTGCPHYS GCPhys;
3877
3878	/* Virtual address = physical address */
3879	GCPhys = PGM_A20_APPLY(pVCpu, GCPtrPage & X86_PAGE_4K_BASE_MASK);
3880	rc = pgmPoolAlloc(pVM, GCPhys & ~(RT_BIT_64(SHW_PD_SHIFT) - 1), BTH_PGMPOOLKIND_PT_FOR_PT, PGMPOOLACCESS_DONTCARE,
3881	PGM_A20_IS_ENABLED(pVCpu), pShwPde->idx, iPDDst, false /fLockPage/,
3882	&pShwPage);
3883	if ( rc == VINF_SUCCESS
3884	\|\| rc == VINF_PGM_CACHED_PAGE)
3885	pPTDst = (PSHWPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPage);
3886	else
3887	{
3888	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3889	AssertMsgFailedReturn(("rc=%Rrc\n", rc), RT_FAILURE_NP(rc) ? rc : VERR_IPE_UNEXPECTED_INFO_STATUS);
3890	}
3891
3892	if (rc == VINF_SUCCESS)
3893	{
3894	/* New page table; fully set it up. */
3895	Assert(pPTDst);
3896
3897	/* Mask away the page offset. */
3898	GCPtrPage &= ~(RTGCPTR)GUEST_PAGE_OFFSET_MASK;
3899
3900	for (unsigned iPTDst = 0; iPTDst < RT_ELEMENTS(pPTDst->a); iPTDst++)
3901	{
3902	RTGCPTR GCPtrCurPage = PGM_A20_APPLY(pVCpu, (GCPtrPage & ~(RTGCPTR)(SHW_PT_MASK << SHW_PT_SHIFT))
3903	\| (iPTDst << GUEST_PAGE_SHIFT));
3904
3905	PGM_BTH_NAME(SyncPageWorker)(pVCpu, &pPTDst->a[iPTDst], GCPtrCurPage, pShwPage, iPTDst);
3906	Log2(("SyncPage: 4K+ %RGv PteSrc:{P=1 RW=1 U=1} PteDst=%08llx%s\n",
3907	GCPtrCurPage,
3908	SHW_PTE_LOG64(pPTDst->a[iPTDst]),
3909	SHW_PTE_IS_TRACK_DIRTY(pPTDst->a[iPTDst]) ? " Track-Dirty" : ""));
3910
3911	if (RT_UNLIKELY(VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY)))
3912	break;
3913	}
3914	}
3915	else
3916	rc = VINF_SUCCESS; /* Cached entry; assume it's still fully valid. */
3917
3918	/* Save the new PDE. */
3919	# if PGM_SHW_TYPE == PGM_TYPE_EPT
3920	PdeDst.u = pShwPage->Core.Key \| EPT_E_READ \| EPT_E_WRITE \| EPT_E_EXECUTE
3921	\| (PdeDst.u & X86_PDE_AVL_MASK /** @todo do we really need this? */);
3922	# else
3923	PdeDst.u = pShwPage->Core.Key \| X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_A
3924	\| (PdeDst.u & X86_PDE_AVL_MASK /** @todo use a PGM_PD_FLAGS define */);
3925	# endif
3926	SHW_PDE_ATOMIC_SET2(*pPdeDst, PdeDst);
3927
3928	STAM_PROFILE_STOP(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPT), a);
3929	if (RT_FAILURE(rc))
3930	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,SyncPTFailed));
3931	return rc;
3932
3933	#else
3934	NOREF(iPDSrc); NOREF(pPDSrc);
3935	AssertReleaseMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_SHW_TYPE, PGM_GST_TYPE));
3936	return VERR_PGM_NOT_USED_IN_MODE;
3937	#endif
3938	}
3939
3940
3941
3942	/**
3943	* Prefetch a page/set of pages.
3944	*
3945	* Typically used to sync commonly used pages before entering raw mode
3946	* after a CR3 reload.
3947	*
3948	* @returns VBox status code.
3949	* @param pVCpu The cross context virtual CPU structure.
3950	* @param GCPtrPage Page to invalidate.
3951	*/
3952	PGM_BTH_DECL(int, PrefetchPage)(PVMCPUCC pVCpu, RTGCPTR GCPtrPage)
3953	{
3954	#if ( PGM_GST_TYPE == PGM_TYPE_32BIT \
3955	\|\| PGM_GST_TYPE == PGM_TYPE_REAL \
3956	\|\| PGM_GST_TYPE == PGM_TYPE_PROT \
3957	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
3958	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64 ) \
3959	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \
3960	&& PGM_SHW_TYPE != PGM_TYPE_NONE
3961	/*
3962	* Check that all Guest levels thru the PDE are present, getting the
3963	* PD and PDE in the processes.
3964	*/
3965	int rc = VINF_SUCCESS;
3966	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
3967	# if PGM_GST_TYPE == PGM_TYPE_32BIT
3968	const unsigned iPDSrc = (uint32_t)GCPtrPage >> GST_PD_SHIFT;
3969	PGSTPD pPDSrc = pgmGstGet32bitPDPtr(pVCpu);
3970	# elif PGM_GST_TYPE == PGM_TYPE_PAE
3971	unsigned iPDSrc;
3972	X86PDPE PdpeSrc;
3973	PGSTPD pPDSrc = pgmGstGetPaePDPtr(pVCpu, GCPtrPage, &iPDSrc, &PdpeSrc);
3974	if (!pPDSrc)
3975	return VINF_SUCCESS; /* not present */
3976	# elif PGM_GST_TYPE == PGM_TYPE_AMD64
3977	unsigned iPDSrc;
3978	PX86PML4E pPml4eSrc;
3979	X86PDPE PdpeSrc;
3980	PGSTPD pPDSrc = pgmGstGetLongModePDPtr(pVCpu, GCPtrPage, &pPml4eSrc, &PdpeSrc, &iPDSrc);
3981	if (!pPDSrc)
3982	return VINF_SUCCESS; /* not present */
3983	# endif
3984	const GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
3985	# else
3986	PGSTPD pPDSrc = NULL;
3987	const unsigned iPDSrc = 0;
3988	GSTPDE const PdeSrc = { X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_A }; /* faked so we don't have to #ifdef everything */
3989	# endif
3990
3991	if ((PdeSrc.u & (X86_PDE_P \| X86_PDE_A)) == (X86_PDE_P \| X86_PDE_A))
3992	{
3993	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
3994	PGM_LOCK_VOID(pVM);
3995
3996	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
3997	const X86PDE PdeDst = pgmShwGet32BitPDE(pVCpu, GCPtrPage);
3998	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
3999	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
4000	PX86PDPAE pPDDst;
4001	X86PDEPAE PdeDst;
4002	# if PGM_GST_TYPE != PGM_TYPE_PAE
4003	X86PDPE PdpeSrc;
4004
4005	/* Fake PDPT entry; access control handled on the page table level, so allow everything. */
4006	PdpeSrc.u = X86_PDPE_P; /* rw/us are reserved for PAE pdpte's; accessed bit causes invalid VT-x guest state errors */
4007	# endif
4008	rc = pgmShwSyncPaePDPtr(pVCpu, GCPtrPage, PdpeSrc.u, &pPDDst);
4009	if (rc != VINF_SUCCESS)
4010	{
4011	PGM_UNLOCK(pVM);
4012	AssertRC(rc);
4013	return rc;
4014	}
4015	Assert(pPDDst);
4016	PdeDst = pPDDst->a[iPDDst];
4017
4018	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
4019	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
4020	PX86PDPAE pPDDst;
4021	X86PDEPAE PdeDst;
4022
4023	# if PGM_GST_TYPE == PGM_TYPE_PROT
4024	/* AMD-V nested paging */
4025	X86PML4E Pml4eSrc;
4026	X86PDPE PdpeSrc;
4027	PX86PML4E pPml4eSrc = &Pml4eSrc;
4028
4029	/* Fake PML4 & PDPT entry; access control handled on the page table level, so allow everything. */
4030	Pml4eSrc.u = X86_PML4E_P \| X86_PML4E_RW \| X86_PML4E_US \| X86_PML4E_A;
4031	PdpeSrc.u = X86_PDPE_P \| X86_PDPE_RW \| X86_PDPE_US \| X86_PDPE_A;
4032	# endif
4033
4034	rc = pgmShwSyncLongModePDPtr(pVCpu, GCPtrPage, pPml4eSrc->u, PdpeSrc.u, &pPDDst);
4035	if (rc != VINF_SUCCESS)
4036	{
4037	PGM_UNLOCK(pVM);
4038	AssertRC(rc);
4039	return rc;
4040	}
4041	Assert(pPDDst);
4042	PdeDst = pPDDst->a[iPDDst];
4043	# endif
4044	if (!(PdeDst.u & X86_PDE_P))
4045	{
4046	/** @todo r=bird: This guy will set the A bit on the PDE,
4047	* probably harmless. */
4048	rc = PGM_BTH_NAME(SyncPT)(pVCpu, iPDSrc, pPDSrc, GCPtrPage);
4049	}
4050	else
4051	{
4052	/* Note! We used to sync PGM_SYNC_NR_PAGES pages, which triggered assertions in CSAM, because
4053	* R/W attributes of nearby pages were reset. Not sure how that could happen. Anyway, it
4054	* makes no sense to prefetch more than one page.
4055	*/
4056	rc = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrc, GCPtrPage, 1, 0);
4057	if (RT_SUCCESS(rc))
4058	rc = VINF_SUCCESS;
4059	}
4060	PGM_UNLOCK(pVM);
4061	}
4062	return rc;
4063
4064	#elif PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \|\| PGM_SHW_TYPE == PGM_TYPE_NONE
4065	NOREF(pVCpu); NOREF(GCPtrPage);
4066	return VINF_SUCCESS; /* ignore */
4067	#else
4068	AssertCompile(0);
4069	#endif
4070	}
4071
4072
4073
4074
4075	/**
4076	* Syncs a page during a PGMVerifyAccess() call.
4077	*
4078	* @returns VBox status code (informational included).
4079	* @param pVCpu The cross context virtual CPU structure.
4080	* @param GCPtrPage The address of the page to sync.
4081	* @param fPage The effective guest page flags.
4082	* @param uErr The trap error code.
4083	* @remarks This will normally never be called on invalid guest page
4084	* translation entries.
4085	*/
4086	PGM_BTH_DECL(int, VerifyAccessSyncPage)(PVMCPUCC pVCpu, RTGCPTR GCPtrPage, unsigned fPage, unsigned uErr)
4087	{
4088	PVMCC pVM = pVCpu->CTX_SUFF(pVM); NOREF(pVM);
4089
4090	LogFlow(("VerifyAccessSyncPage: GCPtrPage=%RGv fPage=%#x uErr=%#x\n", GCPtrPage, fPage, uErr));
4091	RT_NOREF_PV(GCPtrPage); RT_NOREF_PV(fPage); RT_NOREF_PV(uErr);
4092
4093	Assert(!pVM->pgm.s.fNestedPaging);
4094	#if ( PGM_GST_TYPE == PGM_TYPE_32BIT \
4095	\|\| PGM_GST_TYPE == PGM_TYPE_REAL \
4096	\|\| PGM_GST_TYPE == PGM_TYPE_PROT \
4097	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
4098	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64 ) \
4099	&& !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \
4100	&& PGM_SHW_TYPE != PGM_TYPE_NONE
4101
4102	/*
4103	* Get guest PD and index.
4104	*/
4105	/** @todo Performance: We've done all this a jiffy ago in the
4106	* PGMGstGetPage call. */
4107	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
4108	# if PGM_GST_TYPE == PGM_TYPE_32BIT
4109	const unsigned iPDSrc = (uint32_t)GCPtrPage >> GST_PD_SHIFT;
4110	PGSTPD pPDSrc = pgmGstGet32bitPDPtr(pVCpu);
4111
4112	# elif PGM_GST_TYPE == PGM_TYPE_PAE
4113	unsigned iPDSrc = 0;
4114	X86PDPE PdpeSrc;
4115	PGSTPD pPDSrc = pgmGstGetPaePDPtr(pVCpu, GCPtrPage, &iPDSrc, &PdpeSrc);
4116	if (RT_UNLIKELY(!pPDSrc))
4117	{
4118	Log(("PGMVerifyAccess: access violation for %RGv due to non-present PDPTR\n", GCPtrPage));
4119	return VINF_EM_RAW_GUEST_TRAP;
4120	}
4121
4122	# elif PGM_GST_TYPE == PGM_TYPE_AMD64
4123	unsigned iPDSrc = 0; /* shut up gcc */
4124	PX86PML4E pPml4eSrc = NULL; /* ditto */
4125	X86PDPE PdpeSrc;
4126	PGSTPD pPDSrc = pgmGstGetLongModePDPtr(pVCpu, GCPtrPage, &pPml4eSrc, &PdpeSrc, &iPDSrc);
4127	if (RT_UNLIKELY(!pPDSrc))
4128	{
4129	Log(("PGMVerifyAccess: access violation for %RGv due to non-present PDPTR\n", GCPtrPage));
4130	return VINF_EM_RAW_GUEST_TRAP;
4131	}
4132	# endif
4133
4134	# else /* !PGM_WITH_PAGING */
4135	PGSTPD pPDSrc = NULL;
4136	const unsigned iPDSrc = 0;
4137	# endif /* !PGM_WITH_PAGING */
4138	int rc = VINF_SUCCESS;
4139
4140	PGM_LOCK_VOID(pVM);
4141
4142	/*
4143	* First check if the shadow pd is present.
4144	*/
4145	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
4146	PX86PDE pPdeDst = pgmShwGet32BitPDEPtr(pVCpu, GCPtrPage);
4147
4148	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
4149	PX86PDEPAE pPdeDst;
4150	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
4151	PX86PDPAE pPDDst;
4152	# if PGM_GST_TYPE != PGM_TYPE_PAE
4153	/* Fake PDPT entry; access control handled on the page table level, so allow everything. */
4154	X86PDPE PdpeSrc;
4155	PdpeSrc.u = X86_PDPE_P; /* rw/us are reserved for PAE pdpte's; accessed bit causes invalid VT-x guest state errors */
4156	# endif
4157	rc = pgmShwSyncPaePDPtr(pVCpu, GCPtrPage, PdpeSrc.u, &pPDDst);
4158	if (rc != VINF_SUCCESS)
4159	{
4160	PGM_UNLOCK(pVM);
4161	AssertRC(rc);
4162	return rc;
4163	}
4164	Assert(pPDDst);
4165	pPdeDst = &pPDDst->a[iPDDst];
4166
4167	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
4168	const unsigned iPDDst = ((GCPtrPage >> SHW_PD_SHIFT) & SHW_PD_MASK);
4169	PX86PDPAE pPDDst;
4170	PX86PDEPAE pPdeDst;
4171
4172	# if PGM_GST_TYPE == PGM_TYPE_PROT
4173	/* AMD-V nested paging: Fake PML4 & PDPT entry; access control handled on the page table level, so allow everything. */
4174	X86PML4E Pml4eSrc;
4175	X86PDPE PdpeSrc;
4176	PX86PML4E pPml4eSrc = &Pml4eSrc;
4177	Pml4eSrc.u = X86_PML4E_P \| X86_PML4E_RW \| X86_PML4E_US \| X86_PML4E_A;
4178	PdpeSrc.u = X86_PDPE_P \| X86_PDPE_RW \| X86_PDPE_US \| X86_PDPE_A;
4179	# endif
4180
4181	rc = pgmShwSyncLongModePDPtr(pVCpu, GCPtrPage, pPml4eSrc->u, PdpeSrc.u, &pPDDst);
4182	if (rc != VINF_SUCCESS)
4183	{
4184	PGM_UNLOCK(pVM);
4185	AssertRC(rc);
4186	return rc;
4187	}
4188	Assert(pPDDst);
4189	pPdeDst = &pPDDst->a[iPDDst];
4190	# endif
4191
4192	if (!(pPdeDst->u & X86_PDE_P))
4193	{
4194	rc = PGM_BTH_NAME(SyncPT)(pVCpu, iPDSrc, pPDSrc, GCPtrPage);
4195	if (rc != VINF_SUCCESS)
4196	{
4197	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
4198	PGM_UNLOCK(pVM);
4199	AssertRC(rc);
4200	return rc;
4201	}
4202	}
4203
4204	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
4205	/* Check for dirty bit fault */
4206	rc = PGM_BTH_NAME(CheckDirtyPageFault)(pVCpu, uErr, pPdeDst, &pPDSrc->a[iPDSrc], GCPtrPage);
4207	if (rc == VINF_PGM_HANDLED_DIRTY_BIT_FAULT)
4208	Log(("PGMVerifyAccess: success (dirty)\n"));
4209	else
4210	# endif
4211	{
4212	# if PGM_WITH_PAGING(PGM_GST_TYPE, PGM_SHW_TYPE)
4213	GSTPDE PdeSrc = pPDSrc->a[iPDSrc];
4214	# else
4215	GSTPDE const PdeSrc = { X86_PDE_P \| X86_PDE_RW \| X86_PDE_US \| X86_PDE_A }; /* faked so we don't have to #ifdef everything */
4216	# endif
4217
4218	Assert(rc != VINF_EM_RAW_GUEST_TRAP);
4219	if (uErr & X86_TRAP_PF_US)
4220	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncUser));
4221	else /* supervisor */
4222	STAM_COUNTER_INC(&pVCpu->pgm.s.Stats.CTX_MID_Z(Stat,PageOutOfSyncSupervisor));
4223
4224	rc = PGM_BTH_NAME(SyncPage)(pVCpu, PdeSrc, GCPtrPage, 1, 0);
4225	if (RT_SUCCESS(rc))
4226	{
4227	/* Page was successfully synced */
4228	Log2(("PGMVerifyAccess: success (sync)\n"));
4229	rc = VINF_SUCCESS;
4230	}
4231	else
4232	{
4233	Log(("PGMVerifyAccess: access violation for %RGv rc=%Rrc\n", GCPtrPage, rc));
4234	rc = VINF_EM_RAW_GUEST_TRAP;
4235	}
4236	}
4237	PGM_DYNMAP_UNUSED_HINT(pVCpu, pPdeDst);
4238	PGM_UNLOCK(pVM);
4239	return rc;
4240
4241	#else /* PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) */
4242
4243	AssertLogRelMsgFailed(("Shw=%d Gst=%d is not implemented!\n", PGM_GST_TYPE, PGM_SHW_TYPE));
4244	return VERR_PGM_NOT_USED_IN_MODE;
4245	#endif /* PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) */
4246	}
4247
4248
4249	/**
4250	* Syncs the paging hierarchy starting at CR3.
4251	*
4252	* @returns VBox status code, R0/RC may return VINF_PGM_SYNC_CR3, no other
4253	* informational status codes.
4254	* @retval VERR_PGM_NO_HYPERVISOR_ADDRESS in raw-mode when we're unable to map
4255	* the VMM into guest context.
4256	* @param pVCpu The cross context virtual CPU structure.
4257	* @param cr0 Guest context CR0 register.
4258	* @param cr3 Guest context CR3 register. Not subjected to the A20
4259	* mask.
4260	* @param cr4 Guest context CR4 register.
4261	* @param fGlobal Including global page directories or not
4262	*/
4263	PGM_BTH_DECL(int, SyncCR3)(PVMCPUCC pVCpu, uint64_t cr0, uint64_t cr3, uint64_t cr4, bool fGlobal)
4264	{
4265	PVMCC pVM = pVCpu->CTX_SUFF(pVM); NOREF(pVM);
4266	NOREF(cr0); NOREF(cr3); NOREF(cr4); NOREF(fGlobal);
4267
4268	LogFlow(("SyncCR3 FF=%d fGlobal=%d\n", !!VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3), fGlobal));
4269
4270	#if !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_NONE
4271	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
4272	PGM_LOCK_VOID(pVM);
4273	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4274	if (pPool->cDirtyPages)
4275	pgmPoolResetDirtyPages(pVM);
4276	PGM_UNLOCK(pVM);
4277	# endif
4278	#endif /* !NESTED && !EPT */
4279
4280	#if PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \|\| PGM_SHW_TYPE == PGM_TYPE_NONE
4281	/*
4282	* Nested / EPT / None - No work.
4283	*/
4284	return VINF_SUCCESS;
4285
4286	#elif PGM_SHW_TYPE == PGM_TYPE_AMD64
4287	/*
4288	* AMD64 (Shw & Gst) - No need to check all paging levels; we zero
4289	* out the shadow parts when the guest modifies its tables.
4290	*/
4291	return VINF_SUCCESS;
4292
4293	#else /* !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_AMD64 */
4294
4295	return VINF_SUCCESS;
4296	#endif /* !PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) && PGM_SHW_TYPE != PGM_TYPE_AMD64 */
4297	}
4298
4299
4300
4301
4302	#ifdef VBOX_STRICT
4303
4304	/**
4305	* Checks that the shadow page table is in sync with the guest one.
4306	*
4307	* @returns The number of errors.
4308	* @param pVCpu The cross context virtual CPU structure.
4309	* @param cr3 Guest context CR3 register.
4310	* @param cr4 Guest context CR4 register.
4311	* @param GCPtr Where to start. Defaults to 0.
4312	* @param cb How much to check. Defaults to everything.
4313	*/
4314	PGM_BTH_DECL(unsigned, AssertCR3)(PVMCPUCC pVCpu, uint64_t cr3, uint64_t cr4, RTGCPTR GCPtr, RTGCPTR cb)
4315	{
4316	NOREF(pVCpu); NOREF(cr3); NOREF(cr4); NOREF(GCPtr); NOREF(cb);
4317	#if PGM_TYPE_IS_NESTED_OR_EPT(PGM_SHW_TYPE) \|\| PGM_SHW_TYPE == PGM_TYPE_NONE
4318	return 0;
4319	#else
4320	unsigned cErrors = 0;
4321	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
4322	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
4323
4324	# if PGM_GST_TYPE == PGM_TYPE_PAE
4325	/** @todo currently broken; crashes below somewhere */
4326	AssertFailed();
4327	# endif
4328
4329	# if PGM_GST_TYPE == PGM_TYPE_32BIT \
4330	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
4331	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
4332
4333	bool fBigPagesSupported = GST_IS_PSE_ACTIVE(pVCpu);
4334	PPGMCPU pPGM = &pVCpu->pgm.s;
4335	RTGCPHYS GCPhysGst; /* page address derived from the guest page tables. */
4336	RTHCPHYS HCPhysShw; /* page address derived from the shadow page tables. */
4337	# ifndef IN_RING0
4338	RTHCPHYS HCPhys; /* general usage. */
4339	# endif
4340	int rc;
4341
4342	/*
4343	* Check that the Guest CR3 and all its mappings are correct.
4344	*/
4345	AssertMsgReturn(pPGM->GCPhysCR3 == PGM_A20_APPLY(pVCpu, cr3 & GST_CR3_PAGE_MASK),
4346	("Invalid GCPhysCR3=%RGp cr3=%RGp\n", pPGM->GCPhysCR3, (RTGCPHYS)cr3),
4347	false);
4348	# if !defined(IN_RING0) && PGM_GST_TYPE != PGM_TYPE_AMD64
4349	# if 0
4350	# if PGM_GST_TYPE == PGM_TYPE_32BIT
4351	rc = PGMShwGetPage(pVCpu, (RTRCUINTPTR)pPGM->pGst32BitPdRC, NULL, &HCPhysShw);
4352	# else
4353	rc = PGMShwGetPage(pVCpu, (RTRCUINTPTR)pPGM->pGstPaePdptRC, NULL, &HCPhysShw);
4354	# endif
4355	AssertRCReturn(rc, 1);
4356	HCPhys = NIL_RTHCPHYS;
4357	rc = pgmRamGCPhys2HCPhys(pVM, PGM_A20_APPLY(pVCpu, cr3 & GST_CR3_PAGE_MASK), &HCPhys);
4358	AssertMsgReturn(HCPhys == HCPhysShw, ("HCPhys=%RHp HCPhyswShw=%RHp (cr3)\n", HCPhys, HCPhysShw), false);
4359	# endif
4360	# if PGM_GST_TYPE == PGM_TYPE_32BIT && defined(IN_RING3)
4361	pgmGstGet32bitPDPtr(pVCpu);
4362	RTGCPHYS GCPhys;
4363	rc = PGMR3DbgR3Ptr2GCPhys(pVM->pUVM, pPGM->pGst32BitPdR3, &GCPhys);
4364	AssertRCReturn(rc, 1);
4365	AssertMsgReturn(PGM_A20_APPLY(pVCpu, cr3 & GST_CR3_PAGE_MASK) == GCPhys, ("GCPhys=%RGp cr3=%RGp\n", GCPhys, (RTGCPHYS)cr3), false);
4366	# endif
4367	# endif /* !IN_RING0 */
4368
4369	/*
4370	* Get and check the Shadow CR3.
4371	*/
4372	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
4373	unsigned cPDEs = X86_PG_ENTRIES;
4374	unsigned cIncrement = X86_PG_ENTRIES * GUEST_PAGE_SIZE;
4375	# elif PGM_SHW_TYPE == PGM_TYPE_PAE
4376	# if PGM_GST_TYPE == PGM_TYPE_32BIT
4377	unsigned cPDEs = X86_PG_PAE_ENTRIES * 4; /* treat it as a 2048 entry table. */
4378	# else
4379	unsigned cPDEs = X86_PG_PAE_ENTRIES;
4380	# endif
4381	unsigned cIncrement = X86_PG_PAE_ENTRIES * GUEST_PAGE_SIZE;
4382	# elif PGM_SHW_TYPE == PGM_TYPE_AMD64
4383	unsigned cPDEs = X86_PG_PAE_ENTRIES;
4384	unsigned cIncrement = X86_PG_PAE_ENTRIES * GUEST_PAGE_SIZE;
4385	# endif
4386	if (cb != ~(RTGCPTR)0)
4387	cPDEs = RT_MIN(cb >> SHW_PD_SHIFT, 1);
4388
4389	/** @todo call the other two PGMAssert() functions. /
4390
4391	# if PGM_GST_TYPE == PGM_TYPE_AMD64
4392	unsigned iPml4 = (GCPtr >> X86_PML4_SHIFT) & X86_PML4_MASK;
4393
4394	for (; iPml4 < X86_PG_PAE_ENTRIES; iPml4++)
4395	{
4396	PPGMPOOLPAGE pShwPdpt = NULL;
4397	PX86PML4E pPml4eSrc;
4398	PX86PML4E pPml4eDst;
4399	RTGCPHYS GCPhysPdptSrc;
4400
4401	pPml4eSrc = pgmGstGetLongModePML4EPtr(pVCpu, iPml4);
4402	pPml4eDst = pgmShwGetLongModePML4EPtr(pVCpu, iPml4);
4403
4404	/* Fetch the pgm pool shadow descriptor if the shadow pml4e is present. */
4405	if (!(pPml4eDst->u & X86_PML4E_P))
4406	{
4407	GCPtr += _2M * UINT64_C(512) * UINT64_C(512);
4408	continue;
4409	}
4410
4411	pShwPdpt = pgmPoolGetPage(pPool, pPml4eDst->u & X86_PML4E_PG_MASK);
4412	GCPhysPdptSrc = PGM_A20_APPLY(pVCpu, pPml4eSrc->u & X86_PML4E_PG_MASK);
4413
4414	if ((pPml4eSrc->u & X86_PML4E_P) != (pPml4eDst->u & X86_PML4E_P))
4415	{
4416	AssertMsgFailed(("Present bit doesn't match! pPml4eDst.u=%#RX64 pPml4eSrc.u=%RX64\n", pPml4eDst->u, pPml4eSrc->u));
4417	GCPtr += _2M * UINT64_C(512) * UINT64_C(512);
4418	cErrors++;
4419	continue;
4420	}
4421
4422	if (GCPhysPdptSrc != pShwPdpt->GCPhys)
4423	{
4424	AssertMsgFailed(("Physical address doesn't match! iPml4 %d pPml4eDst.u=%#RX64 pPml4eSrc.u=%RX64 Phys %RX64 vs %RX64\n", iPml4, pPml4eDst->u, pPml4eSrc->u, pShwPdpt->GCPhys, GCPhysPdptSrc));
4425	GCPtr += _2M * UINT64_C(512) * UINT64_C(512);
4426	cErrors++;
4427	continue;
4428	}
4429
4430	if ( (pPml4eDst->u & (X86_PML4E_US \| X86_PML4E_RW \| X86_PML4E_NX))
4431	!= (pPml4eSrc->u & (X86_PML4E_US \| X86_PML4E_RW \| X86_PML4E_NX)))
4432	{
4433	AssertMsgFailed(("User/Write/NoExec bits don't match! pPml4eDst.u=%#RX64 pPml4eSrc.u=%RX64\n", pPml4eDst->u, pPml4eSrc->u));
4434	GCPtr += _2M * UINT64_C(512) * UINT64_C(512);
4435	cErrors++;
4436	continue;
4437	}
4438	# else /* PGM_GST_TYPE != PGM_TYPE_AMD64 */
4439	{
4440	# endif /* PGM_GST_TYPE != PGM_TYPE_AMD64 */
4441
4442	# if PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_GST_TYPE == PGM_TYPE_PAE
4443	/*
4444	* Check the PDPTEs too.
4445	*/
4446	unsigned iPdpt = (GCPtr >> SHW_PDPT_SHIFT) & SHW_PDPT_MASK;
4447
4448	for (;iPdpt <= SHW_PDPT_MASK; iPdpt++)
4449	{
4450	unsigned iPDSrc = 0; /* initialized to shut up gcc */
4451	PPGMPOOLPAGE pShwPde = NULL;
4452	PX86PDPE pPdpeDst;
4453	RTGCPHYS GCPhysPdeSrc;
4454	X86PDPE PdpeSrc;
4455	PdpeSrc.u = 0; /* initialized to shut up gcc 4.5 */
4456	# if PGM_GST_TYPE == PGM_TYPE_PAE
4457	PGSTPD pPDSrc = pgmGstGetPaePDPtr(pVCpu, GCPtr, &iPDSrc, &PdpeSrc);
4458	PX86PDPT pPdptDst = pgmShwGetPaePDPTPtr(pVCpu);
4459	# else
4460	PX86PML4E pPml4eSrcIgn;
4461	PX86PDPT pPdptDst;
4462	PX86PDPAE pPDDst;
4463	PGSTPD pPDSrc = pgmGstGetLongModePDPtr(pVCpu, GCPtr, &pPml4eSrcIgn, &PdpeSrc, &iPDSrc);
4464
4465	rc = pgmShwGetLongModePDPtr(pVCpu, GCPtr, NULL, &pPdptDst, &pPDDst);
4466	if (rc != VINF_SUCCESS)
4467	{
4468	AssertMsg(rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT, ("Unexpected rc=%Rrc\n", rc));
4469	GCPtr += 512 * _2M;
4470	continue; /* next PDPTE */
4471	}
4472	Assert(pPDDst);
4473	# endif
4474	Assert(iPDSrc == 0);
4475
4476	pPdpeDst = &pPdptDst->a[iPdpt];
4477
4478	if (!(pPdpeDst->u & X86_PDPE_P))
4479	{
4480	GCPtr += 512 * _2M;
4481	continue; /* next PDPTE */
4482	}
4483
4484	pShwPde = pgmPoolGetPage(pPool, pPdpeDst->u & X86_PDPE_PG_MASK);
4485	GCPhysPdeSrc = PGM_A20_APPLY(pVCpu, PdpeSrc.u & X86_PDPE_PG_MASK);
4486
4487	if ((pPdpeDst->u & X86_PDPE_P) != (PdpeSrc.u & X86_PDPE_P))
4488	{
4489	AssertMsgFailed(("Present bit doesn't match! pPdpeDst.u=%#RX64 pPdpeSrc.u=%RX64\n", pPdpeDst->u, PdpeSrc.u));
4490	GCPtr += 512 * _2M;
4491	cErrors++;
4492	continue;
4493	}
4494
4495	if (GCPhysPdeSrc != pShwPde->GCPhys)
4496	{
4497	# if PGM_GST_TYPE == PGM_TYPE_AMD64
4498	AssertMsgFailed(("Physical address doesn't match! iPml4 %d iPdpt %d pPdpeDst.u=%#RX64 pPdpeSrc.u=%RX64 Phys %RX64 vs %RX64\n", iPml4, iPdpt, pPdpeDst->u, PdpeSrc.u, pShwPde->GCPhys, GCPhysPdeSrc));
4499	# else
4500	AssertMsgFailed(("Physical address doesn't match! iPdpt %d pPdpeDst.u=%#RX64 pPdpeSrc.u=%RX64 Phys %RX64 vs %RX64\n", iPdpt, pPdpeDst->u, PdpeSrc.u, pShwPde->GCPhys, GCPhysPdeSrc));
4501	# endif
4502	GCPtr += 512 * _2M;
4503	cErrors++;
4504	continue;
4505	}
4506
4507	# if PGM_GST_TYPE == PGM_TYPE_AMD64
4508	if ( (pPdpeDst->u & (X86_PDPE_US \| X86_PDPE_RW \| X86_PDPE_LM_NX))
4509	!= (PdpeSrc.u & (X86_PDPE_US \| X86_PDPE_RW \| X86_PDPE_LM_NX)))
4510	{
4511	AssertMsgFailed(("User/Write/NoExec bits don't match! pPdpeDst.u=%#RX64 pPdpeSrc.u=%RX64\n", pPdpeDst->u, PdpeSrc.u));
4512	GCPtr += 512 * _2M;
4513	cErrors++;
4514	continue;
4515	}
4516	# endif
4517
4518	# else /* PGM_GST_TYPE != PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_PAE */
4519	{
4520	# endif /* PGM_GST_TYPE != PGM_TYPE_AMD64 && PGM_GST_TYPE != PGM_TYPE_PAE */
4521	# if PGM_GST_TYPE == PGM_TYPE_32BIT
4522	GSTPD const *pPDSrc = pgmGstGet32bitPDPtr(pVCpu);
4523	# if PGM_SHW_TYPE == PGM_TYPE_32BIT
4524	PCX86PD pPDDst = pgmShwGet32BitPDPtr(pVCpu);
4525	# endif
4526	# endif /* PGM_GST_TYPE == PGM_TYPE_32BIT */
4527	/*
4528	* Iterate the shadow page directory.
4529	*/
4530	GCPtr = (GCPtr >> SHW_PD_SHIFT) << SHW_PD_SHIFT;
4531	unsigned iPDDst = (GCPtr >> SHW_PD_SHIFT) & SHW_PD_MASK;
4532
4533	for (;
4534	iPDDst < cPDEs;
4535	iPDDst++, GCPtr += cIncrement)
4536	{
4537	# if PGM_SHW_TYPE == PGM_TYPE_PAE
4538	const SHWPDE PdeDst = *pgmShwGetPaePDEPtr(pVCpu, GCPtr);
4539	# else
4540	const SHWPDE PdeDst = pPDDst->a[iPDDst];
4541	# endif
4542	if ( (PdeDst.u & X86_PDE_P)
4543	\|\| ((PdeDst.u & (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY)) == (X86_PDE_P \| PGM_PDFLAGS_TRACK_DIRTY)) )
4544	{
4545	HCPhysShw = PdeDst.u & SHW_PDE_PG_MASK;
4546	PPGMPOOLPAGE pPoolPage = pgmPoolGetPage(pPool, HCPhysShw);
4547	if (!pPoolPage)
4548	{
4549	AssertMsgFailed(("Invalid page table address %RHp at %RGv! PdeDst=%#RX64\n",
4550	HCPhysShw, GCPtr, (uint64_t)PdeDst.u));
4551	cErrors++;
4552	continue;
4553	}
4554	const SHWPT pPTDst = (const SHWPT )PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pPoolPage);
4555
4556	if (PdeDst.u & (X86_PDE4M_PWT \| X86_PDE4M_PCD))
4557	{
4558	AssertMsgFailed(("PDE flags PWT and/or PCD is set at %RGv! These flags are not virtualized! PdeDst=%#RX64\n",
4559	GCPtr, (uint64_t)PdeDst.u));
4560	cErrors++;
4561	}
4562
4563	if (PdeDst.u & (X86_PDE4M_G \| X86_PDE4M_D))
4564	{
4565	AssertMsgFailed(("4K PDE reserved flags at %RGv! PdeDst=%#RX64\n",
4566	GCPtr, (uint64_t)PdeDst.u));
4567	cErrors++;
4568	}
4569
4570	const GSTPDE PdeSrc = pPDSrc->a[(iPDDst >> (GST_PD_SHIFT - SHW_PD_SHIFT)) & GST_PD_MASK];
4571	if (!(PdeSrc.u & X86_PDE_P))
4572	{
4573	AssertMsgFailed(("Guest PDE at %RGv is not present! PdeDst=%#RX64 PdeSrc=%#RX64\n",
4574	GCPtr, (uint64_t)PdeDst.u, (uint64_t)PdeSrc.u));
4575	cErrors++;
4576	continue;
4577	}
4578
4579	if ( !(PdeSrc.u & X86_PDE_PS)
4580	\|\| !fBigPagesSupported)
4581	{
4582	GCPhysGst = GST_GET_PDE_GCPHYS(PdeSrc);
4583	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
4584	GCPhysGst = PGM_A20_APPLY(pVCpu, GCPhysGst \| ((iPDDst & 1) * (GUEST_PAGE_SIZE / 2)));
4585	# endif
4586	}
4587	else
4588	{
4589	# if PGM_GST_TYPE == PGM_TYPE_32BIT
4590	if (PdeSrc.u & X86_PDE4M_PG_HIGH_MASK)
4591	{
4592	AssertMsgFailed(("Guest PDE at %RGv is using PSE36 or similar! PdeSrc=%#RX64\n",
4593	GCPtr, (uint64_t)PdeSrc.u));
4594	cErrors++;
4595	continue;
4596	}
4597	# endif
4598	GCPhysGst = GST_GET_BIG_PDE_GCPHYS(pVM, PdeSrc);
4599	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
4600	GCPhysGst = PGM_A20_APPLY(pVCpu, GCPhysGst \| (GCPtr & RT_BIT(X86_PAGE_2M_SHIFT)));
4601	# endif
4602	}
4603
4604	if ( pPoolPage->enmKind
4605	!= (!(PdeSrc.u & X86_PDE_PS) \|\| !fBigPagesSupported ? BTH_PGMPOOLKIND_PT_FOR_PT : BTH_PGMPOOLKIND_PT_FOR_BIG))
4606	{
4607	AssertMsgFailed(("Invalid shadow page table kind %d at %RGv! PdeSrc=%#RX64\n",
4608	pPoolPage->enmKind, GCPtr, (uint64_t)PdeSrc.u));
4609	cErrors++;
4610	}
4611
4612	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhysGst);
4613	if (!pPhysPage)
4614	{
4615	AssertMsgFailed(("Cannot find guest physical address %RGp in the PDE at %RGv! PdeSrc=%#RX64\n",
4616	GCPhysGst, GCPtr, (uint64_t)PdeSrc.u));
4617	cErrors++;
4618	continue;
4619	}
4620
4621	if (GCPhysGst != pPoolPage->GCPhys)
4622	{
4623	AssertMsgFailed(("GCPhysGst=%RGp != pPage->GCPhys=%RGp at %RGv\n",
4624	GCPhysGst, pPoolPage->GCPhys, GCPtr));
4625	cErrors++;
4626	continue;
4627	}
4628
4629	if ( !(PdeSrc.u & X86_PDE_PS)
4630	\|\| !fBigPagesSupported)
4631	{
4632	/*
4633	* Page Table.
4634	*/
4635	const GSTPT *pPTSrc;
4636	rc = PGM_GCPHYS_2_PTR_V2(pVM, pVCpu, PGM_A20_APPLY(pVCpu, GCPhysGst & ~(RTGCPHYS)(GUEST_PAGE_SIZE - 1)),
4637	&pPTSrc);
4638	if (RT_FAILURE(rc))
4639	{
4640	AssertMsgFailed(("Cannot map/convert guest physical address %RGp in the PDE at %RGv! PdeSrc=%#RX64\n",
4641	GCPhysGst, GCPtr, (uint64_t)PdeSrc.u));
4642	cErrors++;
4643	continue;
4644	}
4645	if ( (PdeSrc.u & (X86_PDE_P \| X86_PDE_US \| X86_PDE_RW/* \| X86_PDE_A*/))
4646	!= (PdeDst.u & (X86_PDE_P \| X86_PDE_US \| X86_PDE_RW/* \| X86_PDE_A*/)))
4647	{
4648	/// @todo We get here a lot on out-of-sync CR3 entries. The access handler should zap them to avoid false alarms here!
4649	// (This problem will go away when/if we shadow multiple CR3s.)
4650	AssertMsgFailed(("4K PDE flags mismatch at %RGv! PdeSrc=%#RX64 PdeDst=%#RX64\n",
4651	GCPtr, (uint64_t)PdeSrc.u, (uint64_t)PdeDst.u));
4652	cErrors++;
4653	continue;
4654	}
4655	if (PdeDst.u & PGM_PDFLAGS_TRACK_DIRTY)
4656	{
4657	AssertMsgFailed(("4K PDEs cannot have PGM_PDFLAGS_TRACK_DIRTY set! GCPtr=%RGv PdeDst=%#RX64\n",
4658	GCPtr, (uint64_t)PdeDst.u));
4659	cErrors++;
4660	continue;
4661	}
4662
4663	/* iterate the page table. */
4664	# if PGM_SHW_TYPE == PGM_TYPE_PAE && PGM_GST_TYPE == PGM_TYPE_32BIT
4665	/* Select the right PDE as we're emulating a 4kb page table with 2 shadow page tables. */
4666	const unsigned offPTSrc = ((GCPtr >> SHW_PD_SHIFT) & 1) * 512;
4667	# else
4668	const unsigned offPTSrc = 0;
4669	# endif
4670	for (unsigned iPT = 0, off = 0;
4671	iPT < RT_ELEMENTS(pPTDst->a);
4672	iPT++, off += GUEST_PAGE_SIZE)
4673	{
4674	const SHWPTE PteDst = pPTDst->a[iPT];
4675
4676	/* skip not-present and dirty tracked entries. */
4677	if (!(SHW_PTE_GET_U(PteDst) & (X86_PTE_P \| PGM_PTFLAGS_TRACK_DIRTY))) /** @todo deal with ALL handlers and CSAM !P pages! */
4678	continue;
4679	Assert(SHW_PTE_IS_P(PteDst));
4680
4681	const GSTPTE PteSrc = pPTSrc->a[iPT + offPTSrc];
4682	if (!(PteSrc.u & X86_PTE_P))
4683	{
4684	# ifdef IN_RING3
4685	PGMAssertHandlerAndFlagsInSync(pVM);
4686	DBGFR3PagingDumpEx(pVM->pUVM, pVCpu->idCpu, DBGFPGDMP_FLAGS_CURRENT_CR3 \| DBGFPGDMP_FLAGS_CURRENT_MODE
4687	\| DBGFPGDMP_FLAGS_GUEST \| DBGFPGDMP_FLAGS_HEADER \| DBGFPGDMP_FLAGS_PRINT_CR3,
4688	0, 0, UINT64_MAX, 99, NULL);
4689	# endif
4690	AssertMsgFailed(("Out of sync (!P) PTE at %RGv! PteSrc=%#RX64 PteDst=%#RX64 pPTSrc=%RGv iPTSrc=%x PdeSrc=%x physpte=%RGp\n",
4691	GCPtr + off, (uint64_t)PteSrc.u, SHW_PTE_LOG64(PteDst), pPTSrc, iPT + offPTSrc, PdeSrc.au32[0],
4692	(uint64_t)GST_GET_PDE_GCPHYS(PdeSrc) + (iPT + offPTSrc) * sizeof(PteSrc)));
4693	cErrors++;
4694	continue;
4695	}
4696
4697	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;
4698	# if 1 /** @todo sync accessed bit properly... */
4699	fIgnoreFlags \|= X86_PTE_A;
4700	# endif
4701
4702	/* match the physical addresses */
4703	HCPhysShw = SHW_PTE_GET_HCPHYS(PteDst);
4704	GCPhysGst = GST_GET_PTE_GCPHYS(PteSrc);
4705
4706	# ifdef IN_RING3
4707	rc = PGMPhysGCPhys2HCPhys(pVM, GCPhysGst, &HCPhys);
4708	if (RT_FAILURE(rc))
4709	{
4710	# if 0
4711	if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) /** @todo this is wrong. */
4712	{
4713	AssertMsgFailed(("Cannot find guest physical address %RGp at %RGv! PteSrc=%#RX64 PteDst=%#RX64\n",
4714	GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, SHW_PTE_LOG64(PteDst)));
4715	cErrors++;
4716	continue;
4717	}
4718	# endif
4719	}
4720	else if (HCPhysShw != (HCPhys & SHW_PTE_PG_MASK))
4721	{
4722	AssertMsgFailed(("Out of sync (phys) at %RGv! HCPhysShw=%RHp HCPhys=%RHp GCPhysGst=%RGp PteSrc=%#RX64 PteDst=%#RX64\n",
4723	GCPtr + off, HCPhysShw, HCPhys, GCPhysGst, (uint64_t)PteSrc.u, SHW_PTE_LOG64(PteDst)));
4724	cErrors++;
4725	continue;
4726	}
4727	# endif
4728
4729	pPhysPage = pgmPhysGetPage(pVM, GCPhysGst);
4730	if (!pPhysPage)
4731	{
4732	# if 0
4733	if (HCPhysShw != MMR3PageDummyHCPhys(pVM)) /** @todo this is wrong. */
4734	{
4735	AssertMsgFailed(("Cannot find guest physical address %RGp at %RGv! PteSrc=%#RX64 PteDst=%#RX64\n",
4736	GCPhysGst, GCPtr + off, (uint64_t)PteSrc.u, SHW_PTE_LOG64(PteDst)));
4737	cErrors++;
4738	continue;
4739	}
4740	# endif
4741	if (SHW_PTE_IS_RW(PteDst))
4742	{
4743	AssertMsgFailed(("Invalid guest page at %RGv is writable! GCPhysGst=%RGp PteSrc=%#RX64 PteDst=%#RX64\n",
4744	GCPtr + off, GCPhysGst, (uint64_t)PteSrc.u, SHW_PTE_LOG64(PteDst)));
4745	cErrors++;