PGMAllPool.cpp@ 69120

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1	/* $Id: PGMAllPool.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
2	/** @file
3	* PGM Shadow Page Pool.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PGM_POOL
23	#include <VBox/vmm/pgm.h>
24	#include <VBox/vmm/mm.h>
25	#include <VBox/vmm/em.h>
26	#include <VBox/vmm/cpum.h>
27	#ifdef IN_RC
28	# include <VBox/vmm/patm.h>
29	#endif
30	#include "PGMInternal.h"
31	#include <VBox/vmm/vm.h>
32	#include "PGMInline.h"
33	#include <VBox/disopcode.h>
34	#include <VBox/vmm/hm_vmx.h>
35
36	#include <VBox/log.h>
37	#include <VBox/err.h>
38	#include <iprt/asm.h>
39	#include <iprt/asm-amd64-x86.h>
40	#include <iprt/string.h>
41
42
43	/*********************************************************************************************************************************
44	* Internal Functions *
45	*********************************************************************************************************************************/
46	RT_C_DECLS_BEGIN
47	#if 0 /* unused */
48	DECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind);
49	DECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind);
50	#endif /* unused */
51	static void pgmPoolTrackClearPageUsers(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
52	static void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
53	static int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable);
54	static void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
55	#if defined(LOG_ENABLED) \|\| defined(VBOX_STRICT)
56	static const char *pgmPoolPoolKindToStr(uint8_t enmKind);
57	#endif
58	#if 0 /defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT)/
59	static void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT);
60	#endif
61
62	int pgmPoolTrackFlushGCPhysPTsSlow(PVM pVM, PPGMPAGE pPhysPage);
63	PPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVM pVM, uint16_t *piPhysExt);
64	void pgmPoolTrackPhysExtFree(PVM pVM, uint16_t iPhysExt);
65	void pgmPoolTrackPhysExtFreeList(PVM pVM, uint16_t iPhysExt);
66
67	RT_C_DECLS_END
68
69
70	#if 0 /* unused */
71	/**
72	* Checks if the specified page pool kind is for a 4MB or 2MB guest page.
73	*
74	* @returns true if it's the shadow of a 4MB or 2MB guest page, otherwise false.
75	* @param enmKind The page kind.
76	*/
77	DECLINLINE(bool) pgmPoolIsBigPage(PGMPOOLKIND enmKind)
78	{
79	switch (enmKind)
80	{
81	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
82	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
83	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
84	return true;
85	default:
86	return false;
87	}
88	}
89	#endif /* unused */
90
91
92	/**
93	* Flushes a chain of pages sharing the same access monitor.
94	*
95	* @returns VBox status code suitable for scheduling.
96	* @param pPool The pool.
97	* @param pPage A page in the chain.
98	* @todo VBOXSTRICTRC
99	*/
100	int pgmPoolMonitorChainFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
101	{
102	LogFlow(("pgmPoolMonitorChainFlush: Flush page %RGp type=%d\n", pPage->GCPhys, pPage->enmKind));
103
104	/*
105	* Find the list head.
106	*/
107	uint16_t idx = pPage->idx;
108	if (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
109	{
110	while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
111	{
112	idx = pPage->iMonitoredPrev;
113	Assert(idx != pPage->idx);
114	pPage = &pPool->aPages[idx];
115	}
116	}
117
118	/*
119	* Iterate the list flushing each shadow page.
120	*/
121	int rc = VINF_SUCCESS;
122	for (;;)
123	{
124	idx = pPage->iMonitoredNext;
125	Assert(idx != pPage->idx);
126	if (pPage->idx >= PGMPOOL_IDX_FIRST)
127	{
128	int rc2 = pgmPoolFlushPage(pPool, pPage);
129	AssertRC(rc2);
130	}
131	/* next */
132	if (idx == NIL_PGMPOOL_IDX)
133	break;
134	pPage = &pPool->aPages[idx];
135	}
136	return rc;
137	}
138
139
140	/**
141	* Wrapper for getting the current context pointer to the entry being modified.
142	*
143	* @returns VBox status code suitable for scheduling.
144	* @param pVM The cross context VM structure.
145	* @param pvDst Destination address
146	* @param pvSrc Pointer to the mapping of @a GCPhysSrc or NULL depending
147	* on the context (e.g. \#PF in R0 & RC).
148	* @param GCPhysSrc The source guest physical address.
149	* @param cb Size of data to read
150	*/
151	DECLINLINE(int) pgmPoolPhysSimpleReadGCPhys(PVM pVM, void pvDst, void const pvSrc, RTGCPHYS GCPhysSrc, size_t cb)
152	{
153	#if defined(IN_RING3)
154	NOREF(pVM); NOREF(GCPhysSrc);
155	memcpy(pvDst, (RTHCPTR)((uintptr_t)pvSrc & ~(RTHCUINTPTR)(cb - 1)), cb);
156	return VINF_SUCCESS;
157	#else
158	/** @todo in RC we could attempt to use the virtual address, although this can cause many faults (PAE Windows XP guest). */
159	NOREF(pvSrc);
160	return PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc & ~(RTGCPHYS)(cb - 1), cb);
161	#endif
162	}
163
164
165	/**
166	* Process shadow entries before they are changed by the guest.
167	*
168	* For PT entries we will clear them. For PD entries, we'll simply check
169	* for mapping conflicts and set the SyncCR3 FF if found.
170	*
171	* @param pVCpu The cross context virtual CPU structure.
172	* @param pPool The pool.
173	* @param pPage The head page.
174	* @param GCPhysFault The guest physical fault address.
175	* @param pvAddress Pointer to the mapping of @a GCPhysFault or NULL
176	* depending on the context (e.g. \#PF in R0 & RC).
177	* @param cbWrite Write size; might be zero if the caller knows we're not crossing entry boundaries
178	*/
179	static void pgmPoolMonitorChainChanging(PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhysFault,
180	void const *pvAddress, unsigned cbWrite)
181	{
182	AssertMsg(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX, ("%u (idx=%u)\n", pPage->iMonitoredPrev, pPage->idx));
183	const unsigned off = GCPhysFault & PAGE_OFFSET_MASK;
184	PVM pVM = pPool->CTX_SUFF(pVM);
185	NOREF(pVCpu);
186
187	LogFlow(("pgmPoolMonitorChainChanging: %RGv phys=%RGp cbWrite=%d\n",
188	(RTGCPTR)(CTXTYPE(RTGCPTR, uintptr_t, RTGCPTR))(uintptr_t)pvAddress, GCPhysFault, cbWrite));
189
190	for (;;)
191	{
192	union
193	{
194	void *pv;
195	PX86PT pPT;
196	PPGMSHWPTPAE pPTPae;
197	PX86PD pPD;
198	PX86PDPAE pPDPae;
199	PX86PDPT pPDPT;
200	PX86PML4 pPML4;
201	} uShw;
202
203	LogFlow(("pgmPoolMonitorChainChanging: page idx=%d phys=%RGp (next=%d) kind=%s write=%#x\n",
204	pPage->idx, pPage->GCPhys, pPage->iMonitoredNext, pgmPoolPoolKindToStr(pPage->enmKind), cbWrite));
205
206	uShw.pv = NULL;
207	switch (pPage->enmKind)
208	{
209	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
210	{
211	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
212	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
213	const unsigned iShw = off / sizeof(X86PTE);
214	LogFlow(("PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT iShw=%x\n", iShw));
215	if (uShw.pPT->a[iShw].n.u1Present)
216	{
217	X86PTE GstPte;
218
219	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
220	AssertRC(rc);
221	Log4(("pgmPoolMonitorChainChanging 32_32: deref %016RX64 GCPhys %08RX32\n", uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PG_MASK));
222	pgmPoolTracDerefGCPhysHint(pPool, pPage,
223	uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK,
224	GstPte.u & X86_PTE_PG_MASK,
225	iShw);
226	ASMAtomicWriteU32(&uShw.pPT->a[iShw].u, 0);
227	}
228	break;
229	}
230
231	/* page/2 sized */
232	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
233	{
234	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
235	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
236	if (!((off ^ pPage->GCPhys) & (PAGE_SIZE / 2)))
237	{
238	const unsigned iShw = (off / sizeof(X86PTE)) & (X86_PG_PAE_ENTRIES - 1);
239	LogFlow(("PGMPOOLKIND_PAE_PT_FOR_32BIT_PT iShw=%x\n", iShw));
240	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw]))
241	{
242	X86PTE GstPte;
243	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
244	AssertRC(rc);
245
246	Log4(("pgmPoolMonitorChainChanging pae_32: deref %016RX64 GCPhys %08RX32\n", uShw.pPT->a[iShw].u & X86_PTE_PAE_PG_MASK, GstPte.u & X86_PTE_PG_MASK));
247	pgmPoolTracDerefGCPhysHint(pPool, pPage,
248	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]),
249	GstPte.u & X86_PTE_PG_MASK,
250	iShw);
251	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw], 0);
252	}
253	}
254	break;
255	}
256
257	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
258	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
259	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
260	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
261	{
262	unsigned iGst = off / sizeof(X86PDE);
263	unsigned iShwPdpt = iGst / 256;
264	unsigned iShw = (iGst % 256) * 2;
265	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
266
267	LogFlow(("pgmPoolMonitorChainChanging PAE for 32 bits: iGst=%x iShw=%x idx = %d page idx=%d\n", iGst, iShw, iShwPdpt, pPage->enmKind - PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD));
268	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
269	if (iShwPdpt == pPage->enmKind - (unsigned)PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD)
270	{
271	for (unsigned i = 0; i < 2; i++)
272	{
273	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
274	if ((uShw.pPDPae->a[iShw + i].u & (PGM_PDFLAGS_MAPPING \| X86_PDE_P)) == (PGM_PDFLAGS_MAPPING \| X86_PDE_P))
275	{
276	Assert(pgmMapAreMappingsEnabled(pVM));
277	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
278	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShwPdpt=%#x iShw=%#x!\n", iShwPdpt, iShw+i));
279	break;
280	}
281	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
282	if (uShw.pPDPae->a[iShw+i].n.u1Present)
283	{
284	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw+i, uShw.pPDPae->a[iShw+i].u));
285	pgmPoolFree(pVM,
286	uShw.pPDPae->a[iShw+i].u & X86_PDE_PAE_PG_MASK,
287	pPage->idx,
288	iShw + i);
289	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw+i].u, 0);
290	}
291
292	/* paranoia / a bit assumptive. */
293	if ( (off & 3)
294	&& (off & 3) + cbWrite > 4)
295	{
296	const unsigned iShw2 = iShw + 2 + i;
297	if (iShw2 < RT_ELEMENTS(uShw.pPDPae->a))
298	{
299	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
300	if ((uShw.pPDPae->a[iShw2].u & (PGM_PDFLAGS_MAPPING \| X86_PDE_P)) == (PGM_PDFLAGS_MAPPING \| X86_PDE_P))
301	{
302	Assert(pgmMapAreMappingsEnabled(pVM));
303	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
304	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShwPdpt=%#x iShw2=%#x!\n", iShwPdpt, iShw2));
305	break;
306	}
307	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
308	if (uShw.pPDPae->a[iShw2].n.u1Present)
309	{
310	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
311	pgmPoolFree(pVM,
312	uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
313	pPage->idx,
314	iShw2);
315	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
316	}
317	}
318	}
319	}
320	}
321	break;
322	}
323
324	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
325	{
326	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
327	const unsigned iShw = off / sizeof(X86PTEPAE);
328	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
329	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw]))
330	{
331	X86PTEPAE GstPte;
332	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
333	AssertRC(rc);
334
335	Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]), GstPte.u & X86_PTE_PAE_PG_MASK));
336	pgmPoolTracDerefGCPhysHint(pPool, pPage,
337	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]),
338	GstPte.u & X86_PTE_PAE_PG_MASK,
339	iShw);
340	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw], 0);
341	}
342
343	/* paranoia / a bit assumptive. */
344	if ( (off & 7)
345	&& (off & 7) + cbWrite > sizeof(X86PTEPAE))
346	{
347	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTEPAE);
348	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPTPae->a));
349
350	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw2]))
351	{
352	X86PTEPAE GstPte;
353	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte,
354	pvAddress ? (uint8_t const *)pvAddress + sizeof(GstPte) : NULL,
355	GCPhysFault + sizeof(GstPte), sizeof(GstPte));
356	AssertRC(rc);
357	Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw2]), GstPte.u & X86_PTE_PAE_PG_MASK));
358	pgmPoolTracDerefGCPhysHint(pPool, pPage,
359	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw2]),
360	GstPte.u & X86_PTE_PAE_PG_MASK,
361	iShw2);
362	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw2], 0);
363	}
364	}
365	break;
366	}
367
368	case PGMPOOLKIND_32BIT_PD:
369	{
370	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
371	const unsigned iShw = off / sizeof(X86PTE); // ASSUMING 32-bit guest paging!
372
373	LogFlow(("pgmPoolMonitorChainChanging: PGMPOOLKIND_32BIT_PD %x\n", iShw));
374	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
375	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
376	if (uShw.pPD->a[iShw].u & PGM_PDFLAGS_MAPPING)
377	{
378	Assert(pgmMapAreMappingsEnabled(pVM));
379	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
380	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
381	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw=%#x!\n", iShw));
382	break;
383	}
384	else
385	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
386	{
387	if (uShw.pPD->a[iShw].n.u1Present)
388	{
389	LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPD->a[iShw].u));
390	pgmPoolFree(pVM,
391	uShw.pPD->a[iShw].u & X86_PDE_PAE_PG_MASK,
392	pPage->idx,
393	iShw);
394	ASMAtomicWriteU32(&uShw.pPD->a[iShw].u, 0);
395	}
396	}
397	/* paranoia / a bit assumptive. */
398	if ( (off & 3)
399	&& (off & 3) + cbWrite > sizeof(X86PTE))
400	{
401	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTE);
402	if ( iShw2 != iShw
403	&& iShw2 < RT_ELEMENTS(uShw.pPD->a))
404	{
405	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
406	if (uShw.pPD->a[iShw2].u & PGM_PDFLAGS_MAPPING)
407	{
408	Assert(pgmMapAreMappingsEnabled(pVM));
409	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
410	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
411	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
412	break;
413	}
414	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
415	if (uShw.pPD->a[iShw2].n.u1Present)
416	{
417	LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPD->a[iShw2].u));
418	pgmPoolFree(pVM,
419	uShw.pPD->a[iShw2].u & X86_PDE_PAE_PG_MASK,
420	pPage->idx,
421	iShw2);
422	ASMAtomicWriteU32(&uShw.pPD->a[iShw2].u, 0);
423	}
424	}
425	}
426	#if 0 /* useful when running PGMAssertCR3(), a bit too troublesome for general use (TLBs). - not working any longer... */
427	if ( uShw.pPD->a[iShw].n.u1Present
428	&& !VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
429	{
430	LogFlow(("pgmPoolMonitorChainChanging: iShw=%#x: %RX32 -> freeing it!\n", iShw, uShw.pPD->a[iShw].u));
431	# ifdef IN_RC /* TLB load - we're pushing things a bit... */
432	ASMProbeReadByte(pvAddress);
433	# endif
434	pgmPoolFree(pVM, uShw.pPD->a[iShw].u & X86_PDE_PG_MASK, pPage->idx, iShw);
435	ASMAtomicWriteU32(&uShw.pPD->a[iShw].u, 0);
436	}
437	#endif
438	break;
439	}
440
441	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
442	{
443	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
444	const unsigned iShw = off / sizeof(X86PDEPAE);
445	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
446	#ifdef VBOX_WITH_RAW_MODE_NOT_R0
447	if (uShw.pPDPae->a[iShw].u & PGM_PDFLAGS_MAPPING)
448	{
449	Assert(pgmMapAreMappingsEnabled(pVM));
450	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
451	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
452	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw=%#x!\n", iShw));
453	break;
454	}
455	#endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
456	/*
457	* Causes trouble when the guest uses a PDE to refer to the whole page table level
458	* structure. (Invalidate here; faults later on when it tries to change the page
459	* table entries -> recheck; probably only applies to the RC case.)
460	*/
461	#ifdef VBOX_WITH_RAW_MODE_NOT_R0
462	else
463	#endif
464	{
465	if (uShw.pPDPae->a[iShw].n.u1Present)
466	{
467	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPae->a[iShw].u));
468	pgmPoolFree(pVM,
469	uShw.pPDPae->a[iShw].u & X86_PDE_PAE_PG_MASK,
470	pPage->idx,
471	iShw);
472	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw].u, 0);
473	}
474	}
475	/* paranoia / a bit assumptive. */
476	if ( (off & 7)
477	&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
478	{
479	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
480	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
481
482	#ifdef VBOX_WITH_RAW_MODE_NOT_R0
483	if ( iShw2 != iShw
484	&& uShw.pPDPae->a[iShw2].u & PGM_PDFLAGS_MAPPING)
485	{
486	Assert(pgmMapAreMappingsEnabled(pVM));
487	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
488	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
489	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
490	break;
491	}
492	else
493	#endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
494	if (uShw.pPDPae->a[iShw2].n.u1Present)
495	{
496	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
497	pgmPoolFree(pVM,
498	uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
499	pPage->idx,
500	iShw2);
501	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
502	}
503	}
504	break;
505	}
506
507	case PGMPOOLKIND_PAE_PDPT:
508	{
509	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
510	/*
511	* Hopefully this doesn't happen very often:
512	* - touching unused parts of the page
513	* - messing with the bits of pd pointers without changing the physical address
514	*/
515	/* PDPT roots are not page aligned; 32 byte only! */
516	const unsigned offPdpt = GCPhysFault - pPage->GCPhys;
517
518	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
519	const unsigned iShw = offPdpt / sizeof(X86PDPE);
520	if (iShw < X86_PG_PAE_PDPE_ENTRIES) /* don't use RT_ELEMENTS(uShw.pPDPT->a), because that's for long mode only */
521	{
522	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
523	if (uShw.pPDPT->a[iShw].u & PGM_PLXFLAGS_MAPPING)
524	{
525	Assert(pgmMapAreMappingsEnabled(pVM));
526	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
527	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
528	LogFlow(("pgmPoolMonitorChainChanging: Detected pdpt conflict at iShw=%#x!\n", iShw));
529	break;
530	}
531	else
532	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
533	if (uShw.pPDPT->a[iShw].n.u1Present)
534	{
535	LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPT->a[iShw].u));
536	pgmPoolFree(pVM,
537	uShw.pPDPT->a[iShw].u & X86_PDPE_PG_MASK,
538	pPage->idx,
539	iShw);
540	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw].u, 0);
541	}
542
543	/* paranoia / a bit assumptive. */
544	if ( (offPdpt & 7)
545	&& (offPdpt & 7) + cbWrite > sizeof(X86PDPE))
546	{
547	const unsigned iShw2 = (offPdpt + cbWrite - 1) / sizeof(X86PDPE);
548	if ( iShw2 != iShw
549	&& iShw2 < X86_PG_PAE_PDPE_ENTRIES)
550	{
551	# ifdef VBOX_WITH_RAW_MODE_NOT_R0
552	if (uShw.pPDPT->a[iShw2].u & PGM_PLXFLAGS_MAPPING)
553	{
554	Assert(pgmMapAreMappingsEnabled(pVM));
555	STAM_COUNTER_INC(&(pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZGuestCR3WriteConflict));
556	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
557	LogFlow(("pgmPoolMonitorChainChanging: Detected conflict at iShw2=%#x!\n", iShw2));
558	break;
559	}
560	else
561	# endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
562	if (uShw.pPDPT->a[iShw2].n.u1Present)
563	{
564	LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPT->a[iShw2].u));
565	pgmPoolFree(pVM,
566	uShw.pPDPT->a[iShw2].u & X86_PDPE_PG_MASK,
567	pPage->idx,
568	iShw2);
569	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw2].u, 0);
570	}
571	}
572	}
573	}
574	break;
575	}
576
577	#ifndef IN_RC
578	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
579	{
580	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
581	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
582	const unsigned iShw = off / sizeof(X86PDEPAE);
583	Assert(!(uShw.pPDPae->a[iShw].u & PGM_PDFLAGS_MAPPING));
584	if (uShw.pPDPae->a[iShw].n.u1Present)
585	{
586	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPae->a[iShw].u));
587	pgmPoolFree(pVM,
588	uShw.pPDPae->a[iShw].u & X86_PDE_PAE_PG_MASK,
589	pPage->idx,
590	iShw);
591	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw].u, 0);
592	}
593	/* paranoia / a bit assumptive. */
594	if ( (off & 7)
595	&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
596	{
597	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
598	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
599
600	Assert(!(uShw.pPDPae->a[iShw2].u & PGM_PDFLAGS_MAPPING));
601	if (uShw.pPDPae->a[iShw2].n.u1Present)
602	{
603	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPae->a[iShw2].u));
604	pgmPoolFree(pVM,
605	uShw.pPDPae->a[iShw2].u & X86_PDE_PAE_PG_MASK,
606	pPage->idx,
607	iShw2);
608	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
609	}
610	}
611	break;
612	}
613
614	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
615	{
616	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
617	/*
618	* Hopefully this doesn't happen very often:
619	* - messing with the bits of pd pointers without changing the physical address
620	*/
621	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
622	const unsigned iShw = off / sizeof(X86PDPE);
623	if (uShw.pPDPT->a[iShw].n.u1Present)
624	{
625	LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPT->a[iShw].u));
626	pgmPoolFree(pVM, uShw.pPDPT->a[iShw].u & X86_PDPE_PG_MASK, pPage->idx, iShw);
627	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw].u, 0);
628	}
629	/* paranoia / a bit assumptive. */
630	if ( (off & 7)
631	&& (off & 7) + cbWrite > sizeof(X86PDPE))
632	{
633	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDPE);
634	if (uShw.pPDPT->a[iShw2].n.u1Present)
635	{
636	LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPT->a[iShw2].u));
637	pgmPoolFree(pVM, uShw.pPDPT->a[iShw2].u & X86_PDPE_PG_MASK, pPage->idx, iShw2);
638	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw2].u, 0);
639	}
640	}
641	break;
642	}
643
644	case PGMPOOLKIND_64BIT_PML4:
645	{
646	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPML4));
647	/*
648	* Hopefully this doesn't happen very often:
649	* - messing with the bits of pd pointers without changing the physical address
650	*/
651	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
652	const unsigned iShw = off / sizeof(X86PDPE);
653	if (uShw.pPML4->a[iShw].n.u1Present)
654	{
655	LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPML4->a[iShw].u));
656	pgmPoolFree(pVM, uShw.pPML4->a[iShw].u & X86_PML4E_PG_MASK, pPage->idx, iShw);
657	ASMAtomicWriteU64(&uShw.pPML4->a[iShw].u, 0);
658	}
659	/* paranoia / a bit assumptive. */
660	if ( (off & 7)
661	&& (off & 7) + cbWrite > sizeof(X86PDPE))
662	{
663	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PML4E);
664	if (uShw.pPML4->a[iShw2].n.u1Present)
665	{
666	LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPML4->a[iShw2].u));
667	pgmPoolFree(pVM, uShw.pPML4->a[iShw2].u & X86_PML4E_PG_MASK, pPage->idx, iShw2);
668	ASMAtomicWriteU64(&uShw.pPML4->a[iShw2].u, 0);
669	}
670	}
671	break;
672	}
673	#endif /* IN_RING0 */
674
675	default:
676	AssertFatalMsgFailed(("enmKind=%d\n", pPage->enmKind));
677	}
678	PGM_DYNMAP_UNUSED_HINT_VM(pVM, uShw.pv);
679
680	/* next */
681	if (pPage->iMonitoredNext == NIL_PGMPOOL_IDX)
682	return;
683	pPage = &pPool->aPages[pPage->iMonitoredNext];
684	}
685	}
686
687	#ifndef IN_RING3
688
689	/**
690	* Checks if a access could be a fork operation in progress.
691	*
692	* Meaning, that the guest is setting up the parent process for Copy-On-Write.
693	*
694	* @returns true if it's likely that we're forking, otherwise false.
695	* @param pPool The pool.
696	* @param pDis The disassembled instruction.
697	* @param offFault The access offset.
698	*/
699	DECLINLINE(bool) pgmRZPoolMonitorIsForking(PPGMPOOL pPool, PDISCPUSTATE pDis, unsigned offFault)
700	{
701	/*
702	* i386 linux is using btr to clear X86_PTE_RW.
703	* The functions involved are (2.6.16 source inspection):
704	* clear_bit
705	* ptep_set_wrprotect
706	* copy_one_pte
707	* copy_pte_range
708	* copy_pmd_range
709	* copy_pud_range
710	* copy_page_range
711	* dup_mmap
712	* dup_mm
713	* copy_mm
714	* copy_process
715	* do_fork
716	*/
717	if ( pDis->pCurInstr->uOpcode == OP_BTR
718	&& !(offFault & 4)
719	/** @todo Validate that the bit index is X86_PTE_RW. */
720	)
721	{
722	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,Fork)); RT_NOREF_PV(pPool);
723	return true;
724	}
725	return false;
726	}
727
728
729	/**
730	* Determine whether the page is likely to have been reused.
731	*
732	* @returns true if we consider the page as being reused for a different purpose.
733	* @returns false if we consider it to still be a paging page.
734	* @param pVM The cross context VM structure.
735	* @param pVCpu The cross context virtual CPU structure.
736	* @param pRegFrame Trap register frame.
737	* @param pDis The disassembly info for the faulting instruction.
738	* @param pvFault The fault address.
739	* @param pPage The pool page being accessed.
740	*
741	* @remark The REP prefix check is left to the caller because of STOSD/W.
742	*/
743	DECLINLINE(bool) pgmRZPoolMonitorIsReused(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pDis, RTGCPTR pvFault,
744	PPGMPOOLPAGE pPage)
745	{
746	/* Locked (CR3, PDPTR*4) should not be reusable. Considering them as
747	such may cause loops booting tst-ubuntu-15_10-64-efi, ++. */
748	if (pPage->cLocked)
749	{
750	Log2(("pgmRZPoolMonitorIsReused: %RGv (%p) can't have been resued, because it's locked!\n", pvFault, pPage));
751	return false;
752	}
753
754	# ifndef IN_RC
755	/** @todo could make this general, faulting close to rsp should be a safe reuse heuristic. */
756	if ( HMHasPendingIrq(pVM)
757	&& (pRegFrame->rsp - pvFault) < 32)
758	{
759	/* Fault caused by stack writes while trying to inject an interrupt event. */
760	Log(("pgmRZPoolMonitorIsReused: reused %RGv for interrupt stack (rsp=%RGv).\n", pvFault, pRegFrame->rsp));
761	return true;
762	}
763	# else
764	NOREF(pVM); NOREF(pvFault);
765	# endif
766
767	LogFlow(("Reused instr %RGv %d at %RGv param1.fUse=%llx param1.reg=%d\n", pRegFrame->rip, pDis->pCurInstr->uOpcode, pvFault, pDis->Param1.fUse, pDis->Param1.Base.idxGenReg));
768
769	/* Non-supervisor mode write means it's used for something else. */
770	if (CPUMGetGuestCPL(pVCpu) == 3)
771	return true;
772
773	switch (pDis->pCurInstr->uOpcode)
774	{
775	/* call implies the actual push of the return address faulted */
776	case OP_CALL:
777	Log4(("pgmRZPoolMonitorIsReused: CALL\n"));
778	return true;
779	case OP_PUSH:
780	Log4(("pgmRZPoolMonitorIsReused: PUSH\n"));
781	return true;
782	case OP_PUSHF:
783	Log4(("pgmRZPoolMonitorIsReused: PUSHF\n"));
784	return true;
785	case OP_PUSHA:
786	Log4(("pgmRZPoolMonitorIsReused: PUSHA\n"));
787	return true;
788	case OP_FXSAVE:
789	Log4(("pgmRZPoolMonitorIsReused: FXSAVE\n"));
790	return true;
791	case OP_MOVNTI: /* solaris - block_zero_no_xmm */
792	Log4(("pgmRZPoolMonitorIsReused: MOVNTI\n"));
793	return true;
794	case OP_MOVNTDQ: /* solaris - hwblkclr & hwblkpagecopy */
795	Log4(("pgmRZPoolMonitorIsReused: MOVNTDQ\n"));
796	return true;
797	case OP_MOVSWD:
798	case OP_STOSWD:
799	if ( pDis->fPrefix == (DISPREFIX_REP\|DISPREFIX_REX)
800	&& pRegFrame->rcx >= 0x40
801	)
802	{
803	Assert(pDis->uCpuMode == DISCPUMODE_64BIT);
804
805	Log(("pgmRZPoolMonitorIsReused: OP_STOSQ\n"));
806	return true;
807	}
808	break;
809
810	default:
811	/*
812	* Anything having ESP on the left side means stack writes.
813	*/
814	if ( ( (pDis->Param1.fUse & DISUSE_REG_GEN32)
815	\|\| (pDis->Param1.fUse & DISUSE_REG_GEN64))
816	&& (pDis->Param1.Base.idxGenReg == DISGREG_ESP))
817	{
818	Log4(("pgmRZPoolMonitorIsReused: ESP\n"));
819	return true;
820	}
821	break;
822	}
823
824	/*
825	* Page table updates are very very unlikely to be crossing page boundraries,
826	* and we don't want to deal with that in pgmPoolMonitorChainChanging and such.
827	*/
828	uint32_t const cbWrite = DISGetParamSize(pDis, &pDis->Param1);
829	if ( (((uintptr_t)pvFault + cbWrite) >> X86_PAGE_SHIFT) != ((uintptr_t)pvFault >> X86_PAGE_SHIFT) )
830	{
831	Log4(("pgmRZPoolMonitorIsReused: cross page write\n"));
832	return true;
833	}
834
835	/*
836	* Nobody does an unaligned 8 byte write to a page table, right.
837	*/
838	if (cbWrite >= 8 && ((uintptr_t)pvFault & 7) != 0)
839	{
840	Log4(("pgmRZPoolMonitorIsReused: Unaligned 8+ byte write\n"));
841	return true;
842	}
843
844	return false;
845	}
846
847
848	/**
849	* Flushes the page being accessed.
850	*
851	* @returns VBox status code suitable for scheduling.
852	* @param pVM The cross context VM structure.
853	* @param pVCpu The cross context virtual CPU structure.
854	* @param pPool The pool.
855	* @param pPage The pool page (head).
856	* @param pDis The disassembly of the write instruction.
857	* @param pRegFrame The trap register frame.
858	* @param GCPhysFault The fault address as guest physical address.
859	* @param pvFault The fault address.
860	* @todo VBOXSTRICTRC
861	*/
862	static int pgmRZPoolAccessPfHandlerFlush(PVM pVM, PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
863	PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault)
864	{
865	NOREF(pVM); NOREF(GCPhysFault);
866
867	/*
868	* First, do the flushing.
869	*/
870	int rc = pgmPoolMonitorChainFlush(pPool, pPage);
871
872	/*
873	* Emulate the instruction (xp/w2k problem, requires pc/cr2/sp detection).
874	* Must do this in raw mode (!); XP boot will fail otherwise.
875	*/
876	VBOXSTRICTRC rc2 = EMInterpretInstructionDisasState(pVCpu, pDis, pRegFrame, pvFault, EMCODETYPE_ALL);
877	if (rc2 == VINF_SUCCESS)
878	{ /* do nothing */ }
879	else if (rc2 == VINF_EM_RESCHEDULE)
880	{
881	if (rc == VINF_SUCCESS)
882	rc = VBOXSTRICTRC_VAL(rc2);
883	# ifndef IN_RING3
884	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
885	# endif
886	}
887	else if (rc2 == VERR_EM_INTERPRETER)
888	{
889	# ifdef IN_RC
890	if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
891	{
892	LogFlow(("pgmRZPoolAccessPfHandlerFlush: Interpretation failed for patch code %04x:%RGv, ignoring.\n",
893	pRegFrame->cs.Sel, (RTGCPTR)pRegFrame->eip));
894	rc = VINF_SUCCESS;
895	STAM_COUNTER_INC(&pPool->StatMonitorPfRZIntrFailPatch2);
896	}
897	else
898	# endif
899	{
900	rc = VINF_EM_RAW_EMULATE_INSTR;
901	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,EmulateInstr));
902	}
903	}
904	else if (RT_FAILURE_NP(rc2))
905	rc = VBOXSTRICTRC_VAL(rc2);
906	else
907	AssertMsgFailed(("%Rrc\n", VBOXSTRICTRC_VAL(rc2))); /* ASSUMES no complicated stuff here. */
908
909	LogFlow(("pgmRZPoolAccessPfHandlerFlush: returns %Rrc (flushed)\n", rc));
910	return rc;
911	}
912
913
914	/**
915	* Handles the STOSD write accesses.
916	*
917	* @returns VBox status code suitable for scheduling.
918	* @param pVM The cross context VM structure.
919	* @param pPool The pool.
920	* @param pPage The pool page (head).
921	* @param pDis The disassembly of the write instruction.
922	* @param pRegFrame The trap register frame.
923	* @param GCPhysFault The fault address as guest physical address.
924	* @param pvFault The fault address.
925	*/
926	DECLINLINE(int) pgmRZPoolAccessPfHandlerSTOSD(PVM pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
927	PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault)
928	{
929	unsigned uIncrement = pDis->Param1.cb;
930	NOREF(pVM);
931
932	Assert(pDis->uCpuMode == DISCPUMODE_32BIT \|\| pDis->uCpuMode == DISCPUMODE_64BIT);
933	Assert(pRegFrame->rcx <= 0x20);
934
935	# ifdef VBOX_STRICT
936	if (pDis->uOpMode == DISCPUMODE_32BIT)
937	Assert(uIncrement == 4);
938	else
939	Assert(uIncrement == 8);
940	# endif
941
942	Log3(("pgmRZPoolAccessPfHandlerSTOSD\n"));
943
944	/*
945	* Increment the modification counter and insert it into the list
946	* of modified pages the first time.
947	*/
948	if (!pPage->cModifications++)
949	pgmPoolMonitorModifiedInsert(pPool, pPage);
950
951	/*
952	* Execute REP STOSD.
953	*
954	* This ASSUMES that we're not invoked by Trap0e on in a out-of-sync
955	* write situation, meaning that it's safe to write here.
956	*/
957	PVMCPU pVCpu = VMMGetCpu(pPool->CTX_SUFF(pVM));
958	RTGCUINTPTR pu32 = (RTGCUINTPTR)pvFault;
959	while (pRegFrame->rcx)
960	{
961	# if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
962	uint32_t iPrevSubset = PGMRZDynMapPushAutoSubset(pVCpu);
963	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, uIncrement);
964	PGMRZDynMapPopAutoSubset(pVCpu, iPrevSubset);
965	# else
966	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, uIncrement);
967	# endif
968	# ifdef IN_RC
969	(uint32_t )(uintptr_t)pu32 = pRegFrame->eax;
970	# else
971	PGMPhysSimpleWriteGCPhys(pVM, GCPhysFault, &pRegFrame->rax, uIncrement);
972	# endif
973	pu32 += uIncrement;
974	GCPhysFault += uIncrement;
975	pRegFrame->rdi += uIncrement;
976	pRegFrame->rcx--;
977	}
978	pRegFrame->rip += pDis->cbInstr;
979
980	LogFlow(("pgmRZPoolAccessPfHandlerSTOSD: returns\n"));
981	return VINF_SUCCESS;
982	}
983
984
985	/**
986	* Handles the simple write accesses.
987	*
988	* @returns VBox status code suitable for scheduling.
989	* @param pVM The cross context VM structure.
990	* @param pVCpu The cross context virtual CPU structure.
991	* @param pPool The pool.
992	* @param pPage The pool page (head).
993	* @param pDis The disassembly of the write instruction.
994	* @param pRegFrame The trap register frame.
995	* @param GCPhysFault The fault address as guest physical address.
996	* @param pvFault The fault address.
997	* @param pfReused Reused state (in/out)
998	*/
999	DECLINLINE(int) pgmRZPoolAccessPfHandlerSimple(PVM pVM, PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISCPUSTATE pDis,
1000	PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, RTGCPTR pvFault, bool *pfReused)
1001	{
1002	Log3(("pgmRZPoolAccessPfHandlerSimple\n"));
1003	NOREF(pVM);
1004	NOREF(pfReused); /* initialized by caller */
1005
1006	/*
1007	* Increment the modification counter and insert it into the list
1008	* of modified pages the first time.
1009	*/
1010	if (!pPage->cModifications++)
1011	pgmPoolMonitorModifiedInsert(pPool, pPage);
1012
1013	/*
1014	* Clear all the pages. ASSUMES that pvFault is readable.
1015	*/
1016	# if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
1017	uint32_t iPrevSubset = PGMRZDynMapPushAutoSubset(pVCpu);
1018	# endif
1019
1020	uint32_t cbWrite = DISGetParamSize(pDis, &pDis->Param1);
1021	if (cbWrite <= 8)
1022	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, cbWrite);
1023	else if (cbWrite <= 16)
1024	{
1025	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, 8);
1026	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault + 8, NULL, cbWrite - 8);
1027	}
1028	else
1029	{
1030	Assert(cbWrite <= 32);
1031	for (uint32_t off = 0; off < cbWrite; off += 8)
1032	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault + off, NULL, RT_MIN(8, cbWrite - off));
1033	}
1034
1035	# if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
1036	PGMRZDynMapPopAutoSubset(pVCpu, iPrevSubset);
1037	# endif
1038
1039	/*
1040	* Interpret the instruction.
1041	*/
1042	VBOXSTRICTRC rc = EMInterpretInstructionDisasState(pVCpu, pDis, pRegFrame, pvFault, EMCODETYPE_ALL);
1043	if (RT_SUCCESS(rc))
1044	AssertMsg(rc == VINF_SUCCESS, ("%Rrc\n", VBOXSTRICTRC_VAL(rc))); /* ASSUMES no complicated stuff here. */
1045	else if (rc == VERR_EM_INTERPRETER)
1046	{
1047	LogFlow(("pgmRZPoolAccessPfHandlerSimple: Interpretation failed for %04x:%RGv - opcode=%d\n",
1048	pRegFrame->cs.Sel, (RTGCPTR)pRegFrame->rip, pDis->pCurInstr->uOpcode));
1049	rc = VINF_EM_RAW_EMULATE_INSTR;
1050	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,EmulateInstr));
1051	}
1052
1053	# if 0 /* experimental code */
1054	if (rc == VINF_SUCCESS)
1055	{
1056	switch (pPage->enmKind)
1057	{
1058	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
1059	{
1060	X86PTEPAE GstPte;
1061	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvFault, GCPhysFault, sizeof(GstPte));
1062	AssertRC(rc);
1063
1064	/* Check the new value written by the guest. If present and with a bogus physical address, then
1065	* it's fairly safe to assume the guest is reusing the PT.
1066	*/
1067	if (GstPte.n.u1Present)
1068	{
1069	RTHCPHYS HCPhys = -1;
1070	int rc = PGMPhysGCPhys2HCPhys(pVM, GstPte.u & X86_PTE_PAE_PG_MASK, &HCPhys);
1071	if (rc != VINF_SUCCESS)
1072	{
1073	*pfReused = true;
1074	STAM_COUNTER_INC(&pPool->StatForceFlushReused);
1075	}
1076	}
1077	break;
1078	}
1079	}
1080	}
1081	# endif
1082
1083	LogFlow(("pgmRZPoolAccessPfHandlerSimple: returns %Rrc\n", VBOXSTRICTRC_VAL(rc)));
1084	return VBOXSTRICTRC_VAL(rc);
1085	}
1086
1087
1088	/**
1089	* @callback_method_impl{FNPGMRZPHYSPFHANDLER,
1090	* \#PF access handler callback for page table pages.}
1091	*
1092	* @remarks The @a pvUser argument points to the PGMPOOLPAGE.
1093	*/
1094	DECLEXPORT(VBOXSTRICTRC) pgmRZPoolAccessPfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
1095	RTGCPTR pvFault, RTGCPHYS GCPhysFault, void *pvUser)
1096	{
1097	STAM_PROFILE_START(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorRZ, a);
1098	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1099	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
1100	unsigned cMaxModifications;
1101	bool fForcedFlush = false;
1102	NOREF(uErrorCode);
1103
1104	LogFlow(("pgmRZPoolAccessPfHandler: pvFault=%RGv pPage=%p:{.idx=%d} GCPhysFault=%RGp\n", pvFault, pPage, pPage->idx, GCPhysFault));
1105
1106	pgmLock(pVM);
1107	if (PHYS_PAGE_ADDRESS(GCPhysFault) != PHYS_PAGE_ADDRESS(pPage->GCPhys))
1108	{
1109	/* Pool page changed while we were waiting for the lock; ignore. */
1110	Log(("CPU%d: pgmRZPoolAccessPfHandler pgm pool page for %RGp changed (to %RGp) while waiting!\n", pVCpu->idCpu, PHYS_PAGE_ADDRESS(GCPhysFault), PHYS_PAGE_ADDRESS(pPage->GCPhys)));
1111	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZHandled, a);
1112	pgmUnlock(pVM);
1113	return VINF_SUCCESS;
1114	}
1115	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
1116	if (pPage->fDirty)
1117	{
1118	Assert(VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_TLB_FLUSH));
1119	pgmUnlock(pVM);
1120	return VINF_SUCCESS; /* SMP guest case where we were blocking on the pgm lock while the same page was being marked dirty. */
1121	}
1122	# endif
1123
1124	# if 0 /* test code defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) */
1125	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1126	{
1127	void *pvShw = PGMPOOL_PAGE_2_PTR(pPool->CTX_SUFF(pVM), pPage);
1128	void *pvGst;
1129	int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1130	pgmPoolTrackCheckPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
1131	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1132	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1133	}
1134	# endif
1135
1136	/*
1137	* Disassemble the faulting instruction.
1138	*/
1139	PDISCPUSTATE pDis = &pVCpu->pgm.s.DisState;
1140	int rc = EMInterpretDisasCurrent(pVM, pVCpu, pDis, NULL);
1141	if (RT_UNLIKELY(rc != VINF_SUCCESS))
1142	{
1143	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("Unexpected rc %d\n", rc));
1144	pgmUnlock(pVM);
1145	return rc;
1146	}
1147
1148	Assert(pPage->enmKind != PGMPOOLKIND_FREE);
1149
1150	/*
1151	* We should ALWAYS have the list head as user parameter. This
1152	* is because we use that page to record the changes.
1153	*/
1154	Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1155
1156	# ifdef IN_RING0
1157	/* Maximum nr of modifications depends on the page type. */
1158	if ( pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT
1159	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1160	cMaxModifications = 4;
1161	else
1162	cMaxModifications = 24;
1163	# else
1164	cMaxModifications = 48;
1165	# endif
1166
1167	/*
1168	* Incremental page table updates should weigh more than random ones.
1169	* (Only applies when started from offset 0)
1170	*/
1171	pVCpu->pgm.s.cPoolAccessHandler++;
1172	if ( pPage->GCPtrLastAccessHandlerRip >= pRegFrame->rip - 0x40 /* observed loops in Windows 7 x64 */
1173	&& pPage->GCPtrLastAccessHandlerRip < pRegFrame->rip + 0x40
1174	&& pvFault == (pPage->GCPtrLastAccessHandlerFault + pDis->Param1.cb)
1175	&& pVCpu->pgm.s.cPoolAccessHandler == pPage->cLastAccessHandler + 1)
1176	{
1177	Log(("Possible page reuse cMods=%d -> %d (locked=%d type=%s)\n", pPage->cModifications, pPage->cModifications * 2, pgmPoolIsPageLocked(pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
1178	Assert(pPage->cModifications < 32000);
1179	pPage->cModifications = pPage->cModifications * 2;
1180	pPage->GCPtrLastAccessHandlerFault = pvFault;
1181	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1182	if (pPage->cModifications >= cMaxModifications)
1183	{
1184	STAM_COUNTER_INC(&pPool->StatMonitorPfRZFlushReinit);
1185	fForcedFlush = true;
1186	}
1187	}
1188
1189	if (pPage->cModifications >= cMaxModifications)
1190	Log(("Mod overflow %RGv cMods=%d (locked=%d type=%s)\n", pvFault, pPage->cModifications, pgmPoolIsPageLocked(pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
1191
1192	/*
1193	* Check if it's worth dealing with.
1194	*/
1195	bool fReused = false;
1196	bool fNotReusedNotForking = false;
1197	if ( ( pPage->cModifications < cMaxModifications /** @todo \#define / /* @todo need to check that it's not mapping EIP. / /* @todo adjust this! */
1198	\|\| pgmPoolIsPageLocked(pPage)
1199	)
1200	&& !(fReused = pgmRZPoolMonitorIsReused(pVM, pVCpu, pRegFrame, pDis, pvFault, pPage))
1201	&& !pgmRZPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
1202	{
1203	/*
1204	* Simple instructions, no REP prefix.
1205	*/
1206	if (!(pDis->fPrefix & (DISPREFIX_REP \| DISPREFIX_REPNE)))
1207	{
1208	rc = pgmRZPoolAccessPfHandlerSimple(pVM, pVCpu, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault, &fReused);
1209	if (fReused)
1210	goto flushPage;
1211
1212	/* A mov instruction to change the first page table entry will be remembered so we can detect
1213	* full page table changes early on. This will reduce the amount of unnecessary traps we'll take.
1214	*/
1215	if ( rc == VINF_SUCCESS
1216	&& !pPage->cLocked /* only applies to unlocked pages as we can't free locked ones (e.g. cr3 root). */
1217	&& pDis->pCurInstr->uOpcode == OP_MOV
1218	&& (pvFault & PAGE_OFFSET_MASK) == 0)
1219	{
1220	pPage->GCPtrLastAccessHandlerFault = pvFault;
1221	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1222	pPage->GCPtrLastAccessHandlerRip = pRegFrame->rip;
1223	/* Make sure we don't kick out a page too quickly. */
1224	if (pPage->cModifications > 8)
1225	pPage->cModifications = 2;
1226	}
1227	else if (pPage->GCPtrLastAccessHandlerFault == pvFault)
1228	{
1229	/* ignore the 2nd write to this page table entry. */
1230	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1231	}
1232	else
1233	{
1234	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
1235	pPage->GCPtrLastAccessHandlerRip = 0;
1236	}
1237
1238	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZHandled, a);
1239	pgmUnlock(pVM);
1240	return rc;
1241	}
1242
1243	/*
1244	* Windows is frequently doing small memset() operations (netio test 4k+).
1245	* We have to deal with these or we'll kill the cache and performance.
1246	*/
1247	if ( pDis->pCurInstr->uOpcode == OP_STOSWD
1248	&& !pRegFrame->eflags.Bits.u1DF
1249	&& pDis->uOpMode == pDis->uCpuMode
1250	&& pDis->uAddrMode == pDis->uCpuMode)
1251	{
1252	bool fValidStosd = false;
1253
1254	if ( pDis->uCpuMode == DISCPUMODE_32BIT
1255	&& pDis->fPrefix == DISPREFIX_REP
1256	&& pRegFrame->ecx <= 0x20
1257	&& pRegFrame->ecx * 4 <= PAGE_SIZE - ((uintptr_t)pvFault & PAGE_OFFSET_MASK)
1258	&& !((uintptr_t)pvFault & 3)
1259	&& (pRegFrame->eax == 0 \|\| pRegFrame->eax == 0x80) /* the two values observed. */
1260	)
1261	{
1262	fValidStosd = true;
1263	pRegFrame->rcx &= 0xffffffff; /* paranoia */
1264	}
1265	else
1266	if ( pDis->uCpuMode == DISCPUMODE_64BIT
1267	&& pDis->fPrefix == (DISPREFIX_REP \| DISPREFIX_REX)
1268	&& pRegFrame->rcx <= 0x20
1269	&& pRegFrame->rcx * 8 <= PAGE_SIZE - ((uintptr_t)pvFault & PAGE_OFFSET_MASK)
1270	&& !((uintptr_t)pvFault & 7)
1271	&& (pRegFrame->rax == 0 \|\| pRegFrame->rax == 0x80) /* the two values observed. */
1272	)
1273	{
1274	fValidStosd = true;
1275	}
1276
1277	if (fValidStosd)
1278	{
1279	rc = pgmRZPoolAccessPfHandlerSTOSD(pVM, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault);
1280	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZRepStosd, a);
1281	pgmUnlock(pVM);
1282	return rc;
1283	}
1284	}
1285
1286	/* REP prefix, don't bother. */
1287	STAM_COUNTER_INC(&pPool->StatMonitorPfRZRepPrefix);
1288	Log4(("pgmRZPoolAccessPfHandler: eax=%#x ecx=%#x edi=%#x esi=%#x rip=%RGv opcode=%d prefix=%#x\n",
1289	pRegFrame->eax, pRegFrame->ecx, pRegFrame->edi, pRegFrame->esi, (RTGCPTR)pRegFrame->rip, pDis->pCurInstr->uOpcode, pDis->fPrefix));
1290	fNotReusedNotForking = true;
1291	}
1292
1293	# if defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) && defined(IN_RING0)
1294	/* E.g. Windows 7 x64 initializes page tables and touches some pages in the table during the process. This
1295	* leads to pgm pool trashing and an excessive amount of write faults due to page monitoring.
1296	*/
1297	if ( pPage->cModifications >= cMaxModifications
1298	&& !fForcedFlush
1299	&& (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT \|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1300	&& ( fNotReusedNotForking
1301	\|\| ( !pgmRZPoolMonitorIsReused(pVM, pVCpu, pRegFrame, pDis, pvFault, pPage)
1302	&& !pgmRZPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
1303	)
1304	)
1305	{
1306	Assert(!pgmPoolIsPageLocked(pPage));
1307	Assert(pPage->fDirty == false);
1308
1309	/* Flush any monitored duplicates as we will disable write protection. */
1310	if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
1311	\|\| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
1312	{
1313	PPGMPOOLPAGE pPageHead = pPage;
1314
1315	/* Find the monitor head. */
1316	while (pPageHead->iMonitoredPrev != NIL_PGMPOOL_IDX)
1317	pPageHead = &pPool->aPages[pPageHead->iMonitoredPrev];
1318
1319	while (pPageHead)
1320	{
1321	unsigned idxNext = pPageHead->iMonitoredNext;
1322
1323	if (pPageHead != pPage)
1324	{
1325	STAM_COUNTER_INC(&pPool->StatDirtyPageDupFlush);
1326	Log(("Flush duplicate page idx=%d GCPhys=%RGp type=%s\n", pPageHead->idx, pPageHead->GCPhys, pgmPoolPoolKindToStr(pPageHead->enmKind)));
1327	int rc2 = pgmPoolFlushPage(pPool, pPageHead);
1328	AssertRC(rc2);
1329	}
1330
1331	if (idxNext == NIL_PGMPOOL_IDX)
1332	break;
1333
1334	pPageHead = &pPool->aPages[idxNext];
1335	}
1336	}
1337
1338	/* The flushing above might fail for locked pages, so double check. */
1339	if ( pPage->iMonitoredNext == NIL_PGMPOOL_IDX
1340	&& pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
1341	{
1342	pgmPoolAddDirtyPage(pVM, pPool, pPage);
1343
1344	/* Temporarily allow write access to the page table again. */
1345	rc = PGMHandlerPhysicalPageTempOff(pVM, pPage->GCPhys & PAGE_BASE_GC_MASK, pPage->GCPhys & PAGE_BASE_GC_MASK);
1346	if (rc == VINF_SUCCESS)
1347	{
1348	rc = PGMShwMakePageWritable(pVCpu, pvFault, PGM_MK_PG_IS_WRITE_FAULT);
1349	AssertMsg(rc == VINF_SUCCESS
1350	/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
1351	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT
1352	\|\| rc == VERR_PAGE_NOT_PRESENT,
1353	("PGMShwModifyPage -> GCPtr=%RGv rc=%d\n", pvFault, rc));
1354	# ifdef VBOX_STRICT
1355	pPage->GCPtrDirtyFault = pvFault;
1356	# endif
1357
1358	STAM_PROFILE_STOP(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, a);
1359	pgmUnlock(pVM);
1360	return rc;
1361	}
1362	}
1363	}
1364	# endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT */
1365
1366	STAM_COUNTER_INC(&pPool->StatMonitorPfRZFlushModOverflow);
1367	flushPage:
1368	/*
1369	* Not worth it, so flush it.
1370	*
1371	* If we considered it to be reused, don't go back to ring-3
1372	* to emulate failed instructions since we usually cannot
1373	* interpret then. This may be a bit risky, in which case
1374	* the reuse detection must be fixed.
1375	*/
1376	rc = pgmRZPoolAccessPfHandlerFlush(pVM, pVCpu, pPool, pPage, pDis, pRegFrame, GCPhysFault, pvFault);
1377	if ( rc == VINF_EM_RAW_EMULATE_INSTR
1378	&& fReused)
1379	{
1380	/* Make sure that the current instruction still has shadow page backing, otherwise we'll end up in a loop. */
1381	if (PGMShwGetPage(pVCpu, pRegFrame->rip, NULL, NULL) == VINF_SUCCESS)
1382	rc = VINF_SUCCESS; /* safe to restart the instruction. */
1383	}
1384	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZFlushPage, a);
1385	pgmUnlock(pVM);
1386	return rc;
1387	}
1388
1389	#endif /* !IN_RING3 */
1390
1391	/**
1392	* @callback_method_impl{FNPGMPHYSHANDLER,
1393	* Access handler for shadowed page table pages.}
1394	*
1395	* @remarks Only uses the VINF_PGM_HANDLER_DO_DEFAULT status.
1396	*/
1397	PGM_ALL_CB2_DECL(VBOXSTRICTRC)
1398	pgmPoolAccessHandler(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf,
1399	PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, void *pvUser)
1400	{
1401	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1402	STAM_PROFILE_START(&pPool->CTX_SUFF_Z(StatMonitor), a);
1403	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
1404	LogFlow(("PGM_ALL_CB_DECL: GCPhys=%RGp %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
1405	GCPhys, pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
1406
1407	NOREF(pvPhys); NOREF(pvBuf); NOREF(enmAccessType);
1408
1409	pgmLock(pVM);
1410
1411	#ifdef VBOX_WITH_STATISTICS
1412	/*
1413	* Collect stats on the access.
1414	*/
1415	AssertCompile(RT_ELEMENTS(pPool->CTX_MID_Z(aStatMonitor,Sizes)) == 19);
1416	if (cbBuf <= 16 && cbBuf > 0)
1417	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[cbBuf - 1]);
1418	else if (cbBuf >= 17 && cbBuf < 32)
1419	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[16]);
1420	else if (cbBuf >= 32 && cbBuf < 64)
1421	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[17]);
1422	else if (cbBuf >= 64)
1423	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[18]);
1424
1425	uint8_t cbAlign;
1426	switch (pPage->enmKind)
1427	{
1428	default:
1429	cbAlign = 7;
1430	break;
1431	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
1432	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
1433	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
1434	case PGMPOOLKIND_32BIT_PD:
1435	case PGMPOOLKIND_32BIT_PD_PHYS:
1436	cbAlign = 3;
1437	break;
1438	}
1439	AssertCompile(RT_ELEMENTS(pPool->CTX_MID_Z(aStatMonitor,Misaligned)) == 7);
1440	if ((uint8_t)GCPhys & cbAlign)
1441	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Misaligned)[((uint8_t)GCPhys & cbAlign) - 1]);
1442	#endif
1443
1444	/*
1445	* Make sure the pool page wasn't modified by a different CPU.
1446	*/
1447	if (PHYS_PAGE_ADDRESS(GCPhys) == PHYS_PAGE_ADDRESS(pPage->GCPhys))
1448	{
1449	Assert(pPage->enmKind != PGMPOOLKIND_FREE);
1450
1451	/* The max modification count before flushing depends on the context and page type. */
1452	#ifdef IN_RING3
1453	uint16_t const cMaxModifications = 96; /* it's cheaper here, right? */
1454	#else
1455	uint16_t cMaxModifications;
1456	if ( pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT
1457	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1458	cMaxModifications = 4;
1459	else
1460	cMaxModifications = 24;
1461	# ifdef IN_RC
1462	cMaxModifications = 2; / traps are cheaper than exists. */
1463	# endif
1464	#endif
1465
1466	/*
1467	* We don't have to be very sophisticated about this since there are relativly few calls here.
1468	* However, we must try our best to detect any non-cpu accesses (disk / networking).
1469	*/
1470	if ( ( pPage->cModifications < cMaxModifications
1471	\|\| pgmPoolIsPageLocked(pPage) )
1472	&& enmOrigin != PGMACCESSORIGIN_DEVICE
1473	&& cbBuf <= 16)
1474	{
1475	/* Clear the shadow entry. */
1476	if (!pPage->cModifications++)
1477	pgmPoolMonitorModifiedInsert(pPool, pPage);
1478
1479	if (cbBuf <= 8)
1480	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys, pvBuf, (uint32_t)cbBuf);
1481	else
1482	{
1483	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys, pvBuf, 8);
1484	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys + 8, (uint8_t *)pvBuf + 8, (uint32_t)cbBuf - 8);
1485	}
1486	}
1487	else
1488	{
1489	/* ASSUME that VERR_PGM_POOL_CLEARED can be ignored here and that FFs will deal with it in due time. */
1490	pgmPoolMonitorChainFlush(pPool, pPage);
1491	}
1492
1493	STAM_PROFILE_STOP_EX(&pPool->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,FlushPage), a);
1494	}
1495	else
1496	Log(("CPU%d: PGM_ALL_CB_DECL pgm pool page for %RGp changed (to %RGp) while waiting!\n", pVCpu->idCpu, PHYS_PAGE_ADDRESS(GCPhys), PHYS_PAGE_ADDRESS(pPage->GCPhys)));
1497	pgmUnlock(pVM);
1498	return VINF_PGM_HANDLER_DO_DEFAULT;
1499	}
1500
1501
1502	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
1503
1504	# if defined(VBOX_STRICT) && !defined(IN_RING3)
1505
1506	/**
1507	* Check references to guest physical memory in a PAE / PAE page table.
1508	*
1509	* @param pPool The pool.
1510	* @param pPage The page.
1511	* @param pShwPT The shadow page table (mapping of the page).
1512	* @param pGstPT The guest page table.
1513	*/
1514	static void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT)
1515	{
1516	unsigned cErrors = 0;
1517	int LastRc = -1; /* initialized to shut up gcc */
1518	unsigned LastPTE = ~0U; /* initialized to shut up gcc */
1519	RTHCPHYS LastHCPhys = NIL_RTHCPHYS; /* initialized to shut up gcc */
1520	PVM pVM = pPool->CTX_SUFF(pVM);
1521
1522	#ifdef VBOX_STRICT
1523	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1524	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1525	#endif
1526	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1527	{
1528	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1529	{
1530	RTHCPHYS HCPhys = NIL_RTHCPHYS;
1531	int rc = PGMPhysGCPhys2HCPhys(pVM, pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
1532	if ( rc != VINF_SUCCESS
1533	\|\| PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) != HCPhys)
1534	{
1535	Log(("rc=%d idx=%d guest %RX64 shw=%RX64 vs %RHp\n", rc, i, pGstPT->a[i].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), HCPhys));
1536	LastPTE = i;
1537	LastRc = rc;
1538	LastHCPhys = HCPhys;
1539	cErrors++;
1540
1541	RTHCPHYS HCPhysPT = NIL_RTHCPHYS;
1542	rc = PGMPhysGCPhys2HCPhys(pVM, pPage->GCPhys, &HCPhysPT);
1543	AssertRC(rc);
1544
1545	for (unsigned iPage = 0; iPage < pPool->cCurPages; iPage++)
1546	{
1547	PPGMPOOLPAGE pTempPage = &pPool->aPages[iPage];
1548
1549	if (pTempPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1550	{
1551	PPGMSHWPTPAE pShwPT2 = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pTempPage);
1552
1553	for (unsigned j = 0; j < RT_ELEMENTS(pShwPT->a); j++)
1554	{
1555	if ( PGMSHWPTEPAE_IS_P_RW(pShwPT2->a[j])
1556	&& PGMSHWPTEPAE_GET_HCPHYS(pShwPT2->a[j]) == HCPhysPT)
1557	{
1558	Log(("GCPhys=%RGp idx=%d %RX64 vs %RX64\n", pTempPage->GCPhys, j, PGMSHWPTEPAE_GET_LOG(pShwPT->a[j]), PGMSHWPTEPAE_GET_LOG(pShwPT2->a[j])));
1559	}
1560	}
1561
1562	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPT2);
1563	}
1564	}
1565	}
1566	}
1567	}
1568	AssertMsg(!cErrors, ("cErrors=%d: last rc=%d idx=%d guest %RX64 shw=%RX64 vs %RHp\n", cErrors, LastRc, LastPTE, pGstPT->a[LastPTE].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[LastPTE]), LastHCPhys));
1569	}
1570
1571
1572	/**
1573	* Check references to guest physical memory in a PAE / 32-bit page table.
1574	*
1575	* @param pPool The pool.
1576	* @param pPage The page.
1577	* @param pShwPT The shadow page table (mapping of the page).
1578	* @param pGstPT The guest page table.
1579	*/
1580	static void pgmPoolTrackCheckPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT)
1581	{
1582	unsigned cErrors = 0;
1583	int LastRc = -1; /* initialized to shut up gcc */
1584	unsigned LastPTE = ~0U; /* initialized to shut up gcc */
1585	RTHCPHYS LastHCPhys = NIL_RTHCPHYS; /* initialized to shut up gcc */
1586	PVM pVM = pPool->CTX_SUFF(pVM);
1587
1588	#ifdef VBOX_STRICT
1589	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1590	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1591	#endif
1592	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1593	{
1594	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1595	{
1596	RTHCPHYS HCPhys = NIL_RTHCPHYS;
1597	int rc = PGMPhysGCPhys2HCPhys(pVM, pGstPT->a[i].u & X86_PTE_PG_MASK, &HCPhys);
1598	if ( rc != VINF_SUCCESS
1599	\|\| PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) != HCPhys)
1600	{
1601	Log(("rc=%d idx=%d guest %x shw=%RX64 vs %RHp\n", rc, i, pGstPT->a[i].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), HCPhys));
1602	LastPTE = i;
1603	LastRc = rc;
1604	LastHCPhys = HCPhys;
1605	cErrors++;
1606
1607	RTHCPHYS HCPhysPT = NIL_RTHCPHYS;
1608	rc = PGMPhysGCPhys2HCPhys(pVM, pPage->GCPhys, &HCPhysPT);
1609	AssertRC(rc);
1610
1611	for (unsigned iPage = 0; iPage < pPool->cCurPages; iPage++)
1612	{
1613	PPGMPOOLPAGE pTempPage = &pPool->aPages[iPage];
1614
1615	if (pTempPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1616	{
1617	PPGMSHWPTPAE pShwPT2 = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pTempPage);
1618
1619	for (unsigned j = 0; j < RT_ELEMENTS(pShwPT->a); j++)
1620	{
1621	if ( PGMSHWPTEPAE_IS_P_RW(pShwPT2->a[j])
1622	&& PGMSHWPTEPAE_GET_HCPHYS(pShwPT2->a[j]) == HCPhysPT)
1623	{
1624	Log(("GCPhys=%RGp idx=%d %RX64 vs %RX64\n", pTempPage->GCPhys, j, PGMSHWPTEPAE_GET_LOG(pShwPT->a[j]), PGMSHWPTEPAE_GET_LOG(pShwPT2->a[j])));
1625	}
1626	}
1627
1628	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPT2);
1629	}
1630	}
1631	}
1632	}
1633	}
1634	AssertMsg(!cErrors, ("cErrors=%d: last rc=%d idx=%d guest %x shw=%RX64 vs %RHp\n", cErrors, LastRc, LastPTE, pGstPT->a[LastPTE].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[LastPTE]), LastHCPhys));
1635	}
1636
1637	# endif /* VBOX_STRICT && !IN_RING3 */
1638
1639	/**
1640	* Clear references to guest physical memory in a PAE / PAE page table.
1641	*
1642	* @returns nr of changed PTEs
1643	* @param pPool The pool.
1644	* @param pPage The page.
1645	* @param pShwPT The shadow page table (mapping of the page).
1646	* @param pGstPT The guest page table.
1647	* @param pOldGstPT The old cached guest page table.
1648	* @param fAllowRemoval Bail out as soon as we encounter an invalid PTE
1649	* @param pfFlush Flush reused page table (out)
1650	*/
1651	DECLINLINE(unsigned) pgmPoolTrackFlushPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT,
1652	PCX86PTPAE pOldGstPT, bool fAllowRemoval, bool *pfFlush)
1653	{
1654	unsigned cChanged = 0;
1655
1656	#ifdef VBOX_STRICT
1657	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1658	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1659	#endif
1660	*pfFlush = false;
1661
1662	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1663	{
1664	/* Check the new value written by the guest. If present and with a bogus physical address, then
1665	* it's fairly safe to assume the guest is reusing the PT.
1666	*/
1667	if ( fAllowRemoval
1668	&& pGstPT->a[i].n.u1Present)
1669	{
1670	if (!PGMPhysIsGCPhysValid(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
1671	{
1672	*pfFlush = true;
1673	return ++cChanged;
1674	}
1675	}
1676	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1677	{
1678	/* If the old cached PTE is identical, then there's no need to flush the shadow copy. */
1679	if ((pGstPT->a[i].u & X86_PTE_PAE_PG_MASK) == (pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
1680	{
1681	#ifdef VBOX_STRICT
1682	RTHCPHYS HCPhys = NIL_RTGCPHYS;
1683	int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
1684	AssertMsg(rc == VINF_SUCCESS && PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) == HCPhys, ("rc=%d guest %RX64 old %RX64 shw=%RX64 vs %RHp\n", rc, pGstPT->a[i].u, pOldGstPT->a[i].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), HCPhys));
1685	#endif
1686	uint64_t uHostAttr = PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G \| X86_PTE_PAE_NX);
1687	bool fHostRW = !!(PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & X86_PTE_RW);
1688	uint64_t uGuestAttr = pGstPT->a[i].u & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G \| X86_PTE_PAE_NX);
1689	bool fGuestRW = !!(pGstPT->a[i].u & X86_PTE_RW);
1690
1691	if ( uHostAttr == uGuestAttr
1692	&& fHostRW <= fGuestRW)
1693	continue;
1694	}
1695	cChanged++;
1696	/* Something was changed, so flush it. */
1697	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX64 hint=%RX64\n",
1698	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
1699	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK, i);
1700	PGMSHWPTEPAE_ATOMIC_SET(pShwPT->a[i], 0);
1701	}
1702	}
1703	return cChanged;
1704	}
1705
1706
1707	/**
1708	* Clear references to guest physical memory in a PAE / PAE page table.
1709	*
1710	* @returns nr of changed PTEs
1711	* @param pPool The pool.
1712	* @param pPage The page.
1713	* @param pShwPT The shadow page table (mapping of the page).
1714	* @param pGstPT The guest page table.
1715	* @param pOldGstPT The old cached guest page table.
1716	* @param fAllowRemoval Bail out as soon as we encounter an invalid PTE
1717	* @param pfFlush Flush reused page table (out)
1718	*/
1719	DECLINLINE(unsigned) pgmPoolTrackFlushPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT,
1720	PCX86PT pOldGstPT, bool fAllowRemoval, bool *pfFlush)
1721	{
1722	unsigned cChanged = 0;
1723
1724	#ifdef VBOX_STRICT
1725	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1726	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1727	#endif
1728	*pfFlush = false;
1729
1730	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1731	{
1732	/* Check the new value written by the guest. If present and with a bogus physical address, then
1733	* it's fairly safe to assume the guest is reusing the PT.
1734	*/
1735	if ( fAllowRemoval
1736	&& pGstPT->a[i].n.u1Present)
1737	{
1738	if (!PGMPhysIsGCPhysValid(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PG_MASK))
1739	{
1740	*pfFlush = true;
1741	return ++cChanged;
1742	}
1743	}
1744	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1745	{
1746	/* If the old cached PTE is identical, then there's no need to flush the shadow copy. */
1747	if ((pGstPT->a[i].u & X86_PTE_PG_MASK) == (pOldGstPT->a[i].u & X86_PTE_PG_MASK))
1748	{
1749	#ifdef VBOX_STRICT
1750	RTHCPHYS HCPhys = NIL_RTGCPHYS;
1751	int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PG_MASK, &HCPhys);
1752	AssertMsg(rc == VINF_SUCCESS && PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) == HCPhys, ("rc=%d guest %x old %x shw=%RX64 vs %RHp\n", rc, pGstPT->a[i].u, pOldGstPT->a[i].u, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), HCPhys));
1753	#endif
1754	uint64_t uHostAttr = PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G);
1755	bool fHostRW = !!(PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & X86_PTE_RW);
1756	uint64_t uGuestAttr = pGstPT->a[i].u & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G);
1757	bool fGuestRW = !!(pGstPT->a[i].u & X86_PTE_RW);
1758
1759	if ( uHostAttr == uGuestAttr
1760	&& fHostRW <= fGuestRW)
1761	continue;
1762	}
1763	cChanged++;
1764	/* Something was changed, so flush it. */
1765	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX64 hint=%x\n",
1766	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PG_MASK));
1767	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PG_MASK, i);
1768	PGMSHWPTEPAE_ATOMIC_SET(pShwPT->a[i], 0);
1769	}
1770	}
1771	return cChanged;
1772	}
1773
1774
1775	/**
1776	* Flush a dirty page
1777	*
1778	* @param pVM The cross context VM structure.
1779	* @param pPool The pool.
1780	* @param idxSlot Dirty array slot index
1781	* @param fAllowRemoval Allow a reused page table to be removed
1782	*/
1783	static void pgmPoolFlushDirtyPage(PVM pVM, PPGMPOOL pPool, unsigned idxSlot, bool fAllowRemoval = false)
1784	{
1785	PPGMPOOLPAGE pPage;
1786	unsigned idxPage;
1787
1788	Assert(idxSlot < RT_ELEMENTS(pPool->aDirtyPages));
1789	if (pPool->aDirtyPages[idxSlot].uIdx == NIL_PGMPOOL_IDX)
1790	return;
1791
1792	idxPage = pPool->aDirtyPages[idxSlot].uIdx;
1793	AssertRelease(idxPage != NIL_PGMPOOL_IDX);
1794	pPage = &pPool->aPages[idxPage];
1795	Assert(pPage->idx == idxPage);
1796	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1797
1798	AssertMsg(pPage->fDirty, ("Page %RGp (slot=%d) not marked dirty!", pPage->GCPhys, idxSlot));
1799	Log(("Flush dirty page %RGp cMods=%d\n", pPage->GCPhys, pPage->cModifications));
1800
1801	#if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
1802	PVMCPU pVCpu = VMMGetCpu(pVM);
1803	uint32_t iPrevSubset = PGMRZDynMapPushAutoSubset(pVCpu);
1804	#endif
1805
1806	/* First write protect the page again to catch all write accesses. (before checking for changes -> SMP) */
1807	int rc = PGMHandlerPhysicalReset(pVM, pPage->GCPhys & PAGE_BASE_GC_MASK);
1808	Assert(rc == VINF_SUCCESS);
1809	pPage->fDirty = false;
1810
1811	#ifdef VBOX_STRICT
1812	uint64_t fFlags = 0;
1813	RTHCPHYS HCPhys;
1814	rc = PGMShwGetPage(VMMGetCpu(pVM), pPage->GCPtrDirtyFault, &fFlags, &HCPhys);
1815	AssertMsg( ( rc == VINF_SUCCESS
1816	&& (!(fFlags & X86_PTE_RW) \|\| HCPhys != pPage->Core.Key))
1817	/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
1818	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT
1819	\|\| rc == VERR_PAGE_NOT_PRESENT,
1820	("PGMShwGetPage -> GCPtr=%RGv rc=%d flags=%RX64\n", pPage->GCPtrDirtyFault, rc, fFlags));
1821	#endif
1822
1823	/* Flush those PTEs that have changed. */
1824	STAM_PROFILE_START(&pPool->StatTrackDeref,a);
1825	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
1826	void *pvGst;
1827	rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1828	bool fFlush;
1829	unsigned cChanges;
1830
1831	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1832	cChanges = pgmPoolTrackFlushPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst,
1833	(PCX86PTPAE)&pPool->aDirtyPages[idxSlot].aPage[0], fAllowRemoval, &fFlush);
1834	else
1835	cChanges = pgmPoolTrackFlushPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst,
1836	(PCX86PT)&pPool->aDirtyPages[idxSlot].aPage[0], fAllowRemoval, &fFlush);
1837
1838	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1839	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1840	STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
1841	/* Note: we might want to consider keeping the dirty page active in case there were many changes. */
1842
1843	/* This page is likely to be modified again, so reduce the nr of modifications just a bit here. */
1844	Assert(pPage->cModifications);
1845	if (cChanges < 4)
1846	pPage->cModifications = 1; /* must use > 0 here */
1847	else
1848	pPage->cModifications = RT_MAX(1, pPage->cModifications / 2);
1849
1850	STAM_COUNTER_INC(&pPool->StatResetDirtyPages);
1851	if (pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages))
1852	pPool->idxFreeDirtyPage = idxSlot;
1853
1854	pPool->cDirtyPages--;
1855	pPool->aDirtyPages[idxSlot].uIdx = NIL_PGMPOOL_IDX;
1856	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
1857	if (fFlush)
1858	{
1859	Assert(fAllowRemoval);
1860	Log(("Flush reused page table!\n"));
1861	pgmPoolFlushPage(pPool, pPage);
1862	STAM_COUNTER_INC(&pPool->StatForceFlushReused);
1863	}
1864	else
1865	Log(("Removed dirty page %RGp cMods=%d cChanges=%d\n", pPage->GCPhys, pPage->cModifications, cChanges));
1866
1867	#if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
1868	PGMRZDynMapPopAutoSubset(pVCpu, iPrevSubset);
1869	#endif
1870	}
1871
1872
1873	# ifndef IN_RING3
1874	/**
1875	* Add a new dirty page
1876	*
1877	* @param pVM The cross context VM structure.
1878	* @param pPool The pool.
1879	* @param pPage The page.
1880	*/
1881	void pgmPoolAddDirtyPage(PVM pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage)
1882	{
1883	unsigned idxFree;
1884
1885	PGM_LOCK_ASSERT_OWNER(pVM);
1886	AssertCompile(RT_ELEMENTS(pPool->aDirtyPages) == 8 \|\| RT_ELEMENTS(pPool->aDirtyPages) == 16);
1887	Assert(!pPage->fDirty);
1888
1889	idxFree = pPool->idxFreeDirtyPage;
1890	Assert(idxFree < RT_ELEMENTS(pPool->aDirtyPages));
1891	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1892
1893	if (pPool->cDirtyPages >= RT_ELEMENTS(pPool->aDirtyPages))
1894	{
1895	STAM_COUNTER_INC(&pPool->StatDirtyPageOverFlowFlush);
1896	pgmPoolFlushDirtyPage(pVM, pPool, idxFree, true /* allow removal of reused page tables*/);
1897	}
1898	Assert(pPool->cDirtyPages < RT_ELEMENTS(pPool->aDirtyPages));
1899	AssertMsg(pPool->aDirtyPages[idxFree].uIdx == NIL_PGMPOOL_IDX, ("idxFree=%d cDirtyPages=%d\n", idxFree, pPool->cDirtyPages));
1900
1901	Log(("Add dirty page %RGp (slot=%d)\n", pPage->GCPhys, idxFree));
1902
1903	/*
1904	* Make a copy of the guest page table as we require valid GCPhys addresses
1905	* when removing references to physical pages.
1906	* (The HCPhys linear lookup is extremely expensive!)
1907	*/
1908	void *pvGst;
1909	int rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1910	memcpy(&pPool->aDirtyPages[idxFree].aPage[0], pvGst, (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT) ? PAGE_SIZE : PAGE_SIZE/2);
1911	# ifdef VBOX_STRICT
1912	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
1913	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1914	pgmPoolTrackCheckPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
1915	else
1916	pgmPoolTrackCheckPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst);
1917	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1918	# endif
1919	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1920
1921	STAM_COUNTER_INC(&pPool->StatDirtyPage);
1922	pPage->fDirty = true;
1923	pPage->idxDirtyEntry = (uint8_t)idxFree; Assert(pPage->idxDirtyEntry == idxFree);
1924	pPool->aDirtyPages[idxFree].uIdx = pPage->idx;
1925	pPool->cDirtyPages++;
1926
1927	pPool->idxFreeDirtyPage = (pPool->idxFreeDirtyPage + 1) & (RT_ELEMENTS(pPool->aDirtyPages) - 1);
1928	if ( pPool->cDirtyPages < RT_ELEMENTS(pPool->aDirtyPages)
1929	&& pPool->aDirtyPages[pPool->idxFreeDirtyPage].uIdx != NIL_PGMPOOL_IDX)
1930	{
1931	unsigned i;
1932	for (i = 1; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
1933	{
1934	idxFree = (pPool->idxFreeDirtyPage + i) & (RT_ELEMENTS(pPool->aDirtyPages) - 1);
1935	if (pPool->aDirtyPages[idxFree].uIdx == NIL_PGMPOOL_IDX)
1936	{
1937	pPool->idxFreeDirtyPage = idxFree;
1938	break;
1939	}
1940	}
1941	Assert(i != RT_ELEMENTS(pPool->aDirtyPages));
1942	}
1943
1944	Assert(pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages) \|\| pPool->aDirtyPages[pPool->idxFreeDirtyPage].uIdx == NIL_PGMPOOL_IDX);
1945
1946	/*
1947	* Clear all references to this shadow table. See @bugref{7298}.
1948	*/
1949	pgmPoolTrackClearPageUsers(pPool, pPage);
1950	}
1951	# endif /* !IN_RING3 */
1952
1953
1954	/**
1955	* Check if the specified page is dirty (not write monitored)
1956	*
1957	* @return dirty or not
1958	* @param pVM The cross context VM structure.
1959	* @param GCPhys Guest physical address
1960	*/
1961	bool pgmPoolIsDirtyPage(PVM pVM, RTGCPHYS GCPhys)
1962	{
1963	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1964	PGM_LOCK_ASSERT_OWNER(pVM);
1965	if (!pPool->cDirtyPages)
1966	return false;
1967
1968	GCPhys = GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
1969
1970	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
1971	{
1972	if (pPool->aDirtyPages[i].uIdx != NIL_PGMPOOL_IDX)
1973	{
1974	PPGMPOOLPAGE pPage;
1975	unsigned idxPage = pPool->aDirtyPages[i].uIdx;
1976
1977	pPage = &pPool->aPages[idxPage];
1978	if (pPage->GCPhys == GCPhys)
1979	return true;
1980	}
1981	}
1982	return false;
1983	}
1984
1985
1986	/**
1987	* Reset all dirty pages by reinstating page monitoring.
1988	*
1989	* @param pVM The cross context VM structure.
1990	*/
1991	void pgmPoolResetDirtyPages(PVM pVM)
1992	{
1993	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1994	PGM_LOCK_ASSERT_OWNER(pVM);
1995	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
1996
1997	if (!pPool->cDirtyPages)
1998	return;
1999
2000	Log(("pgmPoolResetDirtyPages\n"));
2001	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2002	pgmPoolFlushDirtyPage(pVM, pPool, i, true /* allow removal of reused page tables*/);
2003
2004	pPool->idxFreeDirtyPage = 0;
2005	if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aDirtyPages)
2006	&& pPool->aDirtyPages[pPool->idxFreeDirtyPage].uIdx != NIL_PGMPOOL_IDX)
2007	{
2008	unsigned i;
2009	for (i = 1; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2010	{
2011	if (pPool->aDirtyPages[i].uIdx == NIL_PGMPOOL_IDX)
2012	{
2013	pPool->idxFreeDirtyPage = i;
2014	break;
2015	}
2016	}
2017	AssertMsg(i != RT_ELEMENTS(pPool->aDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
2018	}
2019
2020	Assert(pPool->aDirtyPages[pPool->idxFreeDirtyPage].uIdx == NIL_PGMPOOL_IDX \|\| pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages));
2021	return;
2022	}
2023
2024
2025	/**
2026	* Invalidate the PT entry for the specified page
2027	*
2028	* @param pVM The cross context VM structure.
2029	* @param GCPtrPage Guest page to invalidate
2030	*/
2031	void pgmPoolResetDirtyPage(PVM pVM, RTGCPTR GCPtrPage)
2032	{
2033	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2034	PGM_LOCK_ASSERT_OWNER(pVM);
2035	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
2036
2037	if (!pPool->cDirtyPages)
2038	return;
2039
2040	Log(("pgmPoolResetDirtyPage %RGv\n", GCPtrPage)); RT_NOREF_PV(GCPtrPage);
2041	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2042	{
2043	}
2044	}
2045
2046
2047	/**
2048	* Reset all dirty pages by reinstating page monitoring.
2049	*
2050	* @param pVM The cross context VM structure.
2051	* @param GCPhysPT Physical address of the page table
2052	*/
2053	void pgmPoolInvalidateDirtyPage(PVM pVM, RTGCPHYS GCPhysPT)
2054	{
2055	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2056	PGM_LOCK_ASSERT_OWNER(pVM);
2057	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
2058	unsigned idxDirtyPage = RT_ELEMENTS(pPool->aDirtyPages);
2059
2060	if (!pPool->cDirtyPages)
2061	return;
2062
2063	GCPhysPT = GCPhysPT & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2064
2065	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2066	{
2067	if (pPool->aDirtyPages[i].uIdx != NIL_PGMPOOL_IDX)
2068	{
2069	unsigned idxPage = pPool->aDirtyPages[i].uIdx;
2070
2071	PPGMPOOLPAGE pPage = &pPool->aPages[idxPage];
2072	if (pPage->GCPhys == GCPhysPT)
2073	{
2074	idxDirtyPage = i;
2075	break;
2076	}
2077	}
2078	}
2079
2080	if (idxDirtyPage != RT_ELEMENTS(pPool->aDirtyPages))
2081	{
2082	pgmPoolFlushDirtyPage(pVM, pPool, idxDirtyPage, true /* allow removal of reused page tables*/);
2083	if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aDirtyPages)
2084	&& pPool->aDirtyPages[pPool->idxFreeDirtyPage].uIdx != NIL_PGMPOOL_IDX)
2085	{
2086	unsigned i;
2087	for (i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2088	{
2089	if (pPool->aDirtyPages[i].uIdx == NIL_PGMPOOL_IDX)
2090	{
2091	pPool->idxFreeDirtyPage = i;
2092	break;
2093	}
2094	}
2095	AssertMsg(i != RT_ELEMENTS(pPool->aDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
2096	}
2097	}
2098	}
2099
2100	# endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT */
2101
2102	/**
2103	* Inserts a page into the GCPhys hash table.
2104	*
2105	* @param pPool The pool.
2106	* @param pPage The page.
2107	*/
2108	DECLINLINE(void) pgmPoolHashInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2109	{
2110	Log3(("pgmPoolHashInsert: %RGp\n", pPage->GCPhys));
2111	Assert(pPage->GCPhys != NIL_RTGCPHYS); Assert(pPage->iNext == NIL_PGMPOOL_IDX);
2112	uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
2113	pPage->iNext = pPool->aiHash[iHash];
2114	pPool->aiHash[iHash] = pPage->idx;
2115	}
2116
2117
2118	/**
2119	* Removes a page from the GCPhys hash table.
2120	*
2121	* @param pPool The pool.
2122	* @param pPage The page.
2123	*/
2124	DECLINLINE(void) pgmPoolHashRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2125	{
2126	Log3(("pgmPoolHashRemove: %RGp\n", pPage->GCPhys));
2127	uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
2128	if (pPool->aiHash[iHash] == pPage->idx)
2129	pPool->aiHash[iHash] = pPage->iNext;
2130	else
2131	{
2132	uint16_t iPrev = pPool->aiHash[iHash];
2133	for (;;)
2134	{
2135	const int16_t i = pPool->aPages[iPrev].iNext;
2136	if (i == pPage->idx)
2137	{
2138	pPool->aPages[iPrev].iNext = pPage->iNext;
2139	break;
2140	}
2141	if (i == NIL_PGMPOOL_IDX)
2142	{
2143	AssertReleaseMsgFailed(("GCPhys=%RGp idx=%d\n", pPage->GCPhys, pPage->idx));
2144	break;
2145	}
2146	iPrev = i;
2147	}
2148	}
2149	pPage->iNext = NIL_PGMPOOL_IDX;
2150	}
2151
2152
2153	/**
2154	* Frees up one cache page.
2155	*
2156	* @returns VBox status code.
2157	* @retval VINF_SUCCESS on success.
2158	* @param pPool The pool.
2159	* @param iUser The user index.
2160	*/
2161	static int pgmPoolCacheFreeOne(PPGMPOOL pPool, uint16_t iUser)
2162	{
2163	#ifndef IN_RC
2164	const PVM pVM = pPool->CTX_SUFF(pVM);
2165	#endif
2166	Assert(pPool->iAgeHead != pPool->iAgeTail); /* We shouldn't be here if there < 2 cached entries! */
2167	STAM_COUNTER_INC(&pPool->StatCacheFreeUpOne);
2168
2169	/*
2170	* Select one page from the tail of the age list.
2171	*/
2172	PPGMPOOLPAGE pPage;
2173	for (unsigned iLoop = 0; ; iLoop++)
2174	{
2175	uint16_t iToFree = pPool->iAgeTail;
2176	if (iToFree == iUser && iUser != NIL_PGMPOOL_IDX)
2177	iToFree = pPool->aPages[iToFree].iAgePrev;
2178	/* This is the alternative to the SyncCR3 pgmPoolCacheUsed calls.
2179	if (pPool->aPages[iToFree].iUserHead != NIL_PGMPOOL_USER_INDEX)
2180	{
2181	uint16_t i = pPool->aPages[iToFree].iAgePrev;
2182	for (unsigned j = 0; j < 10 && i != NIL_PGMPOOL_USER_INDEX; j++, i = pPool->aPages[i].iAgePrev)
2183	{
2184	if (pPool->aPages[iToFree].iUserHead == NIL_PGMPOOL_USER_INDEX)
2185	continue;
2186	iToFree = i;
2187	break;
2188	}
2189	}
2190	*/
2191	Assert(iToFree != iUser);
2192	AssertRelease(iToFree != NIL_PGMPOOL_IDX);
2193	pPage = &pPool->aPages[iToFree];
2194
2195	/*
2196	* Reject any attempts at flushing the currently active shadow CR3 mapping.
2197	* Call pgmPoolCacheUsed to move the page to the head of the age list.
2198	*/
2199	if ( !pgmPoolIsPageLocked(pPage)
2200	&& pPage->idx >= PGMPOOL_IDX_FIRST /* paranoia (#6349) */)
2201	break;
2202	LogFlow(("pgmPoolCacheFreeOne: refuse CR3 mapping\n"));
2203	pgmPoolCacheUsed(pPool, pPage);
2204	AssertLogRelReturn(iLoop < 8192, VERR_PGM_POOL_TOO_MANY_LOOPS);
2205	}
2206
2207	/*
2208	* Found a usable page, flush it and return.
2209	*/
2210	int rc = pgmPoolFlushPage(pPool, pPage);
2211	/* This flush was initiated by us and not the guest, so explicitly flush the TLB. */
2212	/** @todo find out why this is necessary; pgmPoolFlushPage should trigger a flush if one is really needed. */
2213	if (rc == VINF_SUCCESS)
2214	PGM_INVL_ALL_VCPU_TLBS(pVM);
2215	return rc;
2216	}
2217
2218
2219	/**
2220	* Checks if a kind mismatch is really a page being reused
2221	* or if it's just normal remappings.
2222	*
2223	* @returns true if reused and the cached page (enmKind1) should be flushed
2224	* @returns false if not reused.
2225	* @param enmKind1 The kind of the cached page.
2226	* @param enmKind2 The kind of the requested page.
2227	*/
2228	static bool pgmPoolCacheReusedByKind(PGMPOOLKIND enmKind1, PGMPOOLKIND enmKind2)
2229	{
2230	switch (enmKind1)
2231	{
2232	/*
2233	* Never reuse them. There is no remapping in non-paging mode.
2234	*/
2235	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2236	case PGMPOOLKIND_32BIT_PD_PHYS:
2237	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2238	case PGMPOOLKIND_PAE_PD_PHYS:
2239	case PGMPOOLKIND_PAE_PDPT_PHYS:
2240	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2241	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2242	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2243	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2244	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2245	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT: /* never reuse them for other types */
2246	return false;
2247
2248	/*
2249	* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
2250	*/
2251	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2252	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2253	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2254	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2255	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2256	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2257	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2258	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2259	case PGMPOOLKIND_32BIT_PD:
2260	case PGMPOOLKIND_PAE_PDPT:
2261	switch (enmKind2)
2262	{
2263	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2264	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2265	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2266	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2267	case PGMPOOLKIND_64BIT_PML4:
2268	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2269	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2270	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2271	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2272	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2273	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2274	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2275	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2276	return true;
2277	default:
2278	return false;
2279	}
2280
2281	/*
2282	* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
2283	*/
2284	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2285	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2286	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2287	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2288	case PGMPOOLKIND_64BIT_PML4:
2289	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2290	switch (enmKind2)
2291	{
2292	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2293	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2294	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2295	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2296	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2297	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2298	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2299	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2300	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2301	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2302	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2303	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2304	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2305	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2306	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2307	return true;
2308	default:
2309	return false;
2310	}
2311
2312	/*
2313	* These cannot be flushed, and it's common to reuse the PDs as PTs.
2314	*/
2315	case PGMPOOLKIND_ROOT_NESTED:
2316	return false;
2317
2318	default:
2319	AssertFatalMsgFailed(("enmKind1=%d\n", enmKind1));
2320	}
2321	}
2322
2323
2324	/**
2325	* Attempts to satisfy a pgmPoolAlloc request from the cache.
2326	*
2327	* @returns VBox status code.
2328	* @retval VINF_PGM_CACHED_PAGE on success.
2329	* @retval VERR_FILE_NOT_FOUND if not found.
2330	* @param pPool The pool.
2331	* @param GCPhys The GC physical address of the page we're gonna shadow.
2332	* @param enmKind The kind of mapping.
2333	* @param enmAccess Access type for the mapping (only relevant for big pages)
2334	* @param fA20Enabled Whether the CPU has the A20 gate enabled.
2335	* @param iUser The shadow page pool index of the user table. This is
2336	* NIL_PGMPOOL_IDX for root pages.
2337	* @param iUserTable The index into the user table (shadowed). Ignored if
2338	* root page
2339	* @param ppPage Where to store the pointer to the page.
2340	*/
2341	static int pgmPoolCacheAlloc(PPGMPOOL pPool, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, bool fA20Enabled,
2342	uint16_t iUser, uint32_t iUserTable, PPPGMPOOLPAGE ppPage)
2343	{
2344	/*
2345	* Look up the GCPhys in the hash.
2346	*/
2347	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
2348	Log3(("pgmPoolCacheAlloc: %RGp kind %s iUser=%d iUserTable=%x SLOT=%d\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable, i));
2349	if (i != NIL_PGMPOOL_IDX)
2350	{
2351	do
2352	{
2353	PPGMPOOLPAGE pPage = &pPool->aPages[i];
2354	Log4(("pgmPoolCacheAlloc: slot %d found page %RGp\n", i, pPage->GCPhys));
2355	if (pPage->GCPhys == GCPhys)
2356	{
2357	if ( (PGMPOOLKIND)pPage->enmKind == enmKind
2358	&& (PGMPOOLACCESS)pPage->enmAccess == enmAccess
2359	&& pPage->fA20Enabled == fA20Enabled)
2360	{
2361	/* Put it at the start of the use list to make sure pgmPoolTrackAddUser
2362	* doesn't flush it in case there are no more free use records.
2363	*/
2364	pgmPoolCacheUsed(pPool, pPage);
2365
2366	int rc = VINF_SUCCESS;
2367	if (iUser != NIL_PGMPOOL_IDX)
2368	rc = pgmPoolTrackAddUser(pPool, pPage, iUser, iUserTable);
2369	if (RT_SUCCESS(rc))
2370	{
2371	Assert((PGMPOOLKIND)pPage->enmKind == enmKind);
2372	*ppPage = pPage;
2373	if (pPage->cModifications)
2374	pPage->cModifications = 1; /* reset counter (can't use 0, or else it will be reinserted in the modified list) */
2375	STAM_COUNTER_INC(&pPool->StatCacheHits);
2376	return VINF_PGM_CACHED_PAGE;
2377	}
2378	return rc;
2379	}
2380
2381	if ((PGMPOOLKIND)pPage->enmKind != enmKind)
2382	{
2383	/*
2384	* The kind is different. In some cases we should now flush the page
2385	* as it has been reused, but in most cases this is normal remapping
2386	* of PDs as PT or big pages using the GCPhys field in a slightly
2387	* different way than the other kinds.
2388	*/
2389	if (pgmPoolCacheReusedByKind((PGMPOOLKIND)pPage->enmKind, enmKind))
2390	{
2391	STAM_COUNTER_INC(&pPool->StatCacheKindMismatches);
2392	pgmPoolFlushPage(pPool, pPage);
2393	break;
2394	}
2395	}
2396	}
2397
2398	/* next */
2399	i = pPage->iNext;
2400	} while (i != NIL_PGMPOOL_IDX);
2401	}
2402
2403	Log3(("pgmPoolCacheAlloc: Missed GCPhys=%RGp enmKind=%s\n", GCPhys, pgmPoolPoolKindToStr(enmKind)));
2404	STAM_COUNTER_INC(&pPool->StatCacheMisses);
2405	return VERR_FILE_NOT_FOUND;
2406	}
2407
2408
2409	/**
2410	* Inserts a page into the cache.
2411	*
2412	* @param pPool The pool.
2413	* @param pPage The cached page.
2414	* @param fCanBeCached Set if the page is fit for caching from the caller's point of view.
2415	*/
2416	static void pgmPoolCacheInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fCanBeCached)
2417	{
2418	/*
2419	* Insert into the GCPhys hash if the page is fit for that.
2420	*/
2421	Assert(!pPage->fCached);
2422	if (fCanBeCached)
2423	{
2424	pPage->fCached = true;
2425	pgmPoolHashInsert(pPool, pPage);
2426	Log3(("pgmPoolCacheInsert: Caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
2427	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
2428	STAM_COUNTER_INC(&pPool->StatCacheCacheable);
2429	}
2430	else
2431	{
2432	Log3(("pgmPoolCacheInsert: Not caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
2433	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
2434	STAM_COUNTER_INC(&pPool->StatCacheUncacheable);
2435	}
2436
2437	/*
2438	* Insert at the head of the age list.
2439	*/
2440	pPage->iAgePrev = NIL_PGMPOOL_IDX;
2441	pPage->iAgeNext = pPool->iAgeHead;
2442	if (pPool->iAgeHead != NIL_PGMPOOL_IDX)
2443	pPool->aPages[pPool->iAgeHead].iAgePrev = pPage->idx;
2444	else
2445	pPool->iAgeTail = pPage->idx;
2446	pPool->iAgeHead = pPage->idx;
2447	}
2448
2449
2450	/**
2451	* Flushes a cached page.
2452	*
2453	* @param pPool The pool.
2454	* @param pPage The cached page.
2455	*/
2456	static void pgmPoolCacheFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2457	{
2458	Log3(("pgmPoolCacheFlushPage: %RGp\n", pPage->GCPhys));
2459
2460	/*
2461	* Remove the page from the hash.
2462	*/
2463	if (pPage->fCached)
2464	{
2465	pPage->fCached = false;
2466	pgmPoolHashRemove(pPool, pPage);
2467	}
2468	else
2469	Assert(pPage->iNext == NIL_PGMPOOL_IDX);
2470
2471	/*
2472	* Remove it from the age list.
2473	*/
2474	if (pPage->iAgeNext != NIL_PGMPOOL_IDX)
2475	pPool->aPages[pPage->iAgeNext].iAgePrev = pPage->iAgePrev;
2476	else
2477	pPool->iAgeTail = pPage->iAgePrev;
2478	if (pPage->iAgePrev != NIL_PGMPOOL_IDX)
2479	pPool->aPages[pPage->iAgePrev].iAgeNext = pPage->iAgeNext;
2480	else
2481	pPool->iAgeHead = pPage->iAgeNext;
2482	pPage->iAgeNext = NIL_PGMPOOL_IDX;
2483	pPage->iAgePrev = NIL_PGMPOOL_IDX;
2484	}
2485
2486
2487	/**
2488	* Looks for pages sharing the monitor.
2489	*
2490	* @returns Pointer to the head page.
2491	* @returns NULL if not found.
2492	* @param pPool The Pool
2493	* @param pNewPage The page which is going to be monitored.
2494	*/
2495	static PPGMPOOLPAGE pgmPoolMonitorGetPageByGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pNewPage)
2496	{
2497	/*
2498	* Look up the GCPhys in the hash.
2499	*/
2500	RTGCPHYS GCPhys = pNewPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2501	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
2502	if (i == NIL_PGMPOOL_IDX)
2503	return NULL;
2504	do
2505	{
2506	PPGMPOOLPAGE pPage = &pPool->aPages[i];
2507	if ( pPage->GCPhys - GCPhys < PAGE_SIZE
2508	&& pPage != pNewPage)
2509	{
2510	switch (pPage->enmKind)
2511	{
2512	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2513	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2514	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2515	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2516	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2517	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2518	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2519	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2520	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2521	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2522	case PGMPOOLKIND_64BIT_PML4:
2523	case PGMPOOLKIND_32BIT_PD:
2524	case PGMPOOLKIND_PAE_PDPT:
2525	{
2526	/* find the head */
2527	while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
2528	{
2529	Assert(pPage->iMonitoredPrev != pPage->idx);
2530	pPage = &pPool->aPages[pPage->iMonitoredPrev];
2531	}
2532	return pPage;
2533	}
2534
2535	/* ignore, no monitoring. */
2536	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2537	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2538	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2539	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2540	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2541	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2542	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2543	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2544	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2545	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2546	case PGMPOOLKIND_ROOT_NESTED:
2547	case PGMPOOLKIND_PAE_PD_PHYS:
2548	case PGMPOOLKIND_PAE_PDPT_PHYS:
2549	case PGMPOOLKIND_32BIT_PD_PHYS:
2550	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
2551	break;
2552	default:
2553	AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
2554	}
2555	}
2556
2557	/* next */
2558	i = pPage->iNext;
2559	} while (i != NIL_PGMPOOL_IDX);
2560	return NULL;
2561	}
2562
2563
2564	/**
2565	* Enabled write monitoring of a guest page.
2566	*
2567	* @returns VBox status code.
2568	* @retval VINF_SUCCESS on success.
2569	* @param pPool The pool.
2570	* @param pPage The cached page.
2571	*/
2572	static int pgmPoolMonitorInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2573	{
2574	LogFlow(("pgmPoolMonitorInsert %RGp\n", pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK));
2575
2576	/*
2577	* Filter out the relevant kinds.
2578	*/
2579	switch (pPage->enmKind)
2580	{
2581	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2582	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2583	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2584	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2585	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2586	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2587	case PGMPOOLKIND_64BIT_PML4:
2588	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2589	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2590	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2591	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2592	case PGMPOOLKIND_32BIT_PD:
2593	case PGMPOOLKIND_PAE_PDPT:
2594	break;
2595
2596	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2597	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2598	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2599	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2600	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2601	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2602	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2603	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2604	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2605	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2606	case PGMPOOLKIND_ROOT_NESTED:
2607	/* Nothing to monitor here. */
2608	return VINF_SUCCESS;
2609
2610	case PGMPOOLKIND_32BIT_PD_PHYS:
2611	case PGMPOOLKIND_PAE_PDPT_PHYS:
2612	case PGMPOOLKIND_PAE_PD_PHYS:
2613	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
2614	/* Nothing to monitor here. */
2615	return VINF_SUCCESS;
2616	default:
2617	AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
2618	}
2619
2620	/*
2621	* Install handler.
2622	*/
2623	int rc;
2624	PPGMPOOLPAGE pPageHead = pgmPoolMonitorGetPageByGCPhys(pPool, pPage);
2625	if (pPageHead)
2626	{
2627	Assert(pPageHead != pPage); Assert(pPageHead->iMonitoredNext != pPage->idx);
2628	Assert(pPageHead->iMonitoredPrev != pPage->idx);
2629
2630	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
2631	if (pPageHead->fDirty)
2632	pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPageHead->idxDirtyEntry, false /* do not remove */);
2633	#endif
2634
2635	pPage->iMonitoredPrev = pPageHead->idx;
2636	pPage->iMonitoredNext = pPageHead->iMonitoredNext;
2637	if (pPageHead->iMonitoredNext != NIL_PGMPOOL_IDX)
2638	pPool->aPages[pPageHead->iMonitoredNext].iMonitoredPrev = pPage->idx;
2639	pPageHead->iMonitoredNext = pPage->idx;
2640	rc = VINF_SUCCESS;
2641	}
2642	else
2643	{
2644	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX); Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
2645	PVM pVM = pPool->CTX_SUFF(pVM);
2646	const RTGCPHYS GCPhysPage = pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2647	rc = PGMHandlerPhysicalRegister(pVM, GCPhysPage, GCPhysPage + PAGE_OFFSET_MASK, pPool->hAccessHandlerType,
2648	MMHyperCCToR3(pVM, pPage), MMHyperCCToR0(pVM, pPage), MMHyperCCToRC(pVM, pPage),
2649	NIL_RTR3PTR /pszDesc/);
2650	/** @todo we should probably deal with out-of-memory conditions here, but for now increasing
2651	* the heap size should suffice. */
2652	AssertFatalMsgRC(rc, ("PGMHandlerPhysicalRegisterEx %RGp failed with %Rrc\n", GCPhysPage, rc));
2653	PVMCPU pVCpu = VMMGetCpu(pVM);
2654	AssertFatalMsg(!(pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL) \|\| VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3), ("fSyncFlags=%x syncff=%d\n", pVCpu->pgm.s.fSyncFlags, VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)));
2655	}
2656	pPage->fMonitored = true;
2657	return rc;
2658	}
2659
2660
2661	/**
2662	* Disables write monitoring of a guest page.
2663	*
2664	* @returns VBox status code.
2665	* @retval VINF_SUCCESS on success.
2666	* @param pPool The pool.
2667	* @param pPage The cached page.
2668	*/
2669	static int pgmPoolMonitorFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2670	{
2671	/*
2672	* Filter out the relevant kinds.
2673	*/
2674	switch (pPage->enmKind)
2675	{
2676	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2677	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2678	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2679	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2680	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2681	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2682	case PGMPOOLKIND_64BIT_PML4:
2683	case PGMPOOLKIND_32BIT_PD:
2684	case PGMPOOLKIND_PAE_PDPT:
2685	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2686	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2687	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2688	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2689	break;
2690
2691	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2692	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2693	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2694	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2695	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2696	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2697	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2698	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2699	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2700	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2701	case PGMPOOLKIND_ROOT_NESTED:
2702	case PGMPOOLKIND_PAE_PD_PHYS:
2703	case PGMPOOLKIND_PAE_PDPT_PHYS:
2704	case PGMPOOLKIND_32BIT_PD_PHYS:
2705	/* Nothing to monitor here. */
2706	Assert(!pPage->fMonitored);
2707	return VINF_SUCCESS;
2708
2709	default:
2710	AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
2711	}
2712	Assert(pPage->fMonitored);
2713
2714	/*
2715	* Remove the page from the monitored list or uninstall it if last.
2716	*/
2717	const PVM pVM = pPool->CTX_SUFF(pVM);
2718	int rc;
2719	if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
2720	\|\| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
2721	{
2722	if (pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
2723	{
2724	PPGMPOOLPAGE pNewHead = &pPool->aPages[pPage->iMonitoredNext];
2725	pNewHead->iMonitoredPrev = NIL_PGMPOOL_IDX;
2726	rc = PGMHandlerPhysicalChangeUserArgs(pVM, pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK, MMHyperCCToR3(pVM, pNewHead),
2727	MMHyperCCToR0(pVM, pNewHead), MMHyperCCToRC(pVM, pNewHead));
2728
2729	AssertFatalRCSuccess(rc);
2730	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
2731	}
2732	else
2733	{
2734	pPool->aPages[pPage->iMonitoredPrev].iMonitoredNext = pPage->iMonitoredNext;
2735	if (pPage->iMonitoredNext != NIL_PGMPOOL_IDX)
2736	{
2737	pPool->aPages[pPage->iMonitoredNext].iMonitoredPrev = pPage->iMonitoredPrev;
2738	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
2739	}
2740	pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
2741	rc = VINF_SUCCESS;
2742	}
2743	}
2744	else
2745	{
2746	rc = PGMHandlerPhysicalDeregister(pVM, pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK);
2747	AssertFatalRC(rc);
2748	PVMCPU pVCpu = VMMGetCpu(pVM);
2749	AssertFatalMsg(!(pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL) \|\| VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3),
2750	("%#x %#x\n", pVCpu->pgm.s.fSyncFlags, pVM->fGlobalForcedActions));
2751	}
2752	pPage->fMonitored = false;
2753
2754	/*
2755	* Remove it from the list of modified pages (if in it).
2756	*/
2757	pgmPoolMonitorModifiedRemove(pPool, pPage);
2758
2759	return rc;
2760	}
2761
2762
2763	/**
2764	* Inserts the page into the list of modified pages.
2765	*
2766	* @param pPool The pool.
2767	* @param pPage The page.
2768	*/
2769	void pgmPoolMonitorModifiedInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2770	{
2771	Log3(("pgmPoolMonitorModifiedInsert: idx=%d\n", pPage->idx));
2772	AssertMsg( pPage->iModifiedNext == NIL_PGMPOOL_IDX
2773	&& pPage->iModifiedPrev == NIL_PGMPOOL_IDX
2774	&& pPool->iModifiedHead != pPage->idx,
2775	("Next=%d Prev=%d idx=%d cModifications=%d Head=%d cModifiedPages=%d\n",
2776	pPage->iModifiedNext, pPage->iModifiedPrev, pPage->idx, pPage->cModifications,
2777	pPool->iModifiedHead, pPool->cModifiedPages));
2778
2779	pPage->iModifiedNext = pPool->iModifiedHead;
2780	if (pPool->iModifiedHead != NIL_PGMPOOL_IDX)
2781	pPool->aPages[pPool->iModifiedHead].iModifiedPrev = pPage->idx;
2782	pPool->iModifiedHead = pPage->idx;
2783	pPool->cModifiedPages++;
2784	#ifdef VBOX_WITH_STATISTICS
2785	if (pPool->cModifiedPages > pPool->cModifiedPagesHigh)
2786	pPool->cModifiedPagesHigh = pPool->cModifiedPages;
2787	#endif
2788	}
2789
2790
2791	/**
2792	* Removes the page from the list of modified pages and resets the
2793	* modification counter.
2794	*
2795	* @param pPool The pool.
2796	* @param pPage The page which is believed to be in the list of modified pages.
2797	*/
2798	static void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2799	{
2800	Log3(("pgmPoolMonitorModifiedRemove: idx=%d cModifications=%d\n", pPage->idx, pPage->cModifications));
2801	if (pPool->iModifiedHead == pPage->idx)
2802	{
2803	Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
2804	pPool->iModifiedHead = pPage->iModifiedNext;
2805	if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
2806	{
2807	pPool->aPages[pPage->iModifiedNext].iModifiedPrev = NIL_PGMPOOL_IDX;
2808	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2809	}
2810	pPool->cModifiedPages--;
2811	}
2812	else if (pPage->iModifiedPrev != NIL_PGMPOOL_IDX)
2813	{
2814	pPool->aPages[pPage->iModifiedPrev].iModifiedNext = pPage->iModifiedNext;
2815	if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
2816	{
2817	pPool->aPages[pPage->iModifiedNext].iModifiedPrev = pPage->iModifiedPrev;
2818	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2819	}
2820	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
2821	pPool->cModifiedPages--;
2822	}
2823	else
2824	Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
2825	pPage->cModifications = 0;
2826	}
2827
2828
2829	/**
2830	* Zaps the list of modified pages, resetting their modification counters in the process.
2831	*
2832	* @param pVM The cross context VM structure.
2833	*/
2834	static void pgmPoolMonitorModifiedClearAll(PVM pVM)
2835	{
2836	pgmLock(pVM);
2837	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2838	LogFlow(("pgmPoolMonitorModifiedClearAll: cModifiedPages=%d\n", pPool->cModifiedPages));
2839
2840	unsigned cPages = 0; NOREF(cPages);
2841
2842	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
2843	pgmPoolResetDirtyPages(pVM);
2844	#endif
2845
2846	uint16_t idx = pPool->iModifiedHead;
2847	pPool->iModifiedHead = NIL_PGMPOOL_IDX;
2848	while (idx != NIL_PGMPOOL_IDX)
2849	{
2850	PPGMPOOLPAGE pPage = &pPool->aPages[idx];
2851	idx = pPage->iModifiedNext;
2852	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2853	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
2854	pPage->cModifications = 0;
2855	Assert(++cPages);
2856	}
2857	AssertMsg(cPages == pPool->cModifiedPages, ("%d != %d\n", cPages, pPool->cModifiedPages));
2858	pPool->cModifiedPages = 0;
2859	pgmUnlock(pVM);
2860	}
2861
2862
2863	/**
2864	* Handle SyncCR3 pool tasks
2865	*
2866	* @returns VBox status code.
2867	* @retval VINF_SUCCESS if successfully added.
2868	* @retval VINF_PGM_SYNC_CR3 is it needs to be deferred to ring 3 (GC only)
2869	* @param pVCpu The cross context virtual CPU structure.
2870	* @remark Should only be used when monitoring is available, thus placed in
2871	* the PGMPOOL_WITH_MONITORING \#ifdef.
2872	*/
2873	int pgmPoolSyncCR3(PVMCPU pVCpu)
2874	{
2875	PVM pVM = pVCpu->CTX_SUFF(pVM);
2876	LogFlow(("pgmPoolSyncCR3 fSyncFlags=%x\n", pVCpu->pgm.s.fSyncFlags));
2877
2878	/*
2879	* When monitoring shadowed pages, we reset the modification counters on CR3 sync.
2880	* Occasionally we will have to clear all the shadow page tables because we wanted
2881	* to monitor a page which was mapped by too many shadowed page tables. This operation
2882	* sometimes referred to as a 'lightweight flush'.
2883	*/
2884	# ifdef IN_RING3 /* Don't flush in ring-0 or raw mode, it's taking too long. */
2885	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2886	pgmR3PoolClearAll(pVM, false /fFlushRemTlb/);
2887	# else /* !IN_RING3 */
2888	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2889	{
2890	Log(("SyncCR3: PGM_SYNC_CLEAR_PGM_POOL is set -> VINF_PGM_SYNC_CR3\n"));
2891	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */
2892
2893	/* Make sure all other VCPUs return to ring 3. */
2894	if (pVM->cCpus > 1)
2895	{
2896	VM_FF_SET(pVM, VM_FF_PGM_POOL_FLUSH_PENDING);
2897	PGM_INVL_ALL_VCPU_TLBS(pVM);
2898	}
2899	return VINF_PGM_SYNC_CR3;
2900	}
2901	# endif /* !IN_RING3 */
2902	else
2903	{
2904	pgmPoolMonitorModifiedClearAll(pVM);
2905
2906	/* pgmPoolMonitorModifiedClearAll can cause a pgm pool flush (dirty page clearing), so make sure we handle this! */
2907	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2908	{
2909	Log(("pgmPoolMonitorModifiedClearAll caused a pgm flush -> call pgmPoolSyncCR3 again!\n"));
2910	return pgmPoolSyncCR3(pVCpu);
2911	}
2912	}
2913	return VINF_SUCCESS;
2914	}
2915
2916
2917	/**
2918	* Frees up at least one user entry.
2919	*
2920	* @returns VBox status code.
2921	* @retval VINF_SUCCESS if successfully added.
2922	* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
2923	* @param pPool The pool.
2924	* @param iUser The user index.
2925	*/
2926	static int pgmPoolTrackFreeOneUser(PPGMPOOL pPool, uint16_t iUser)
2927	{
2928	STAM_COUNTER_INC(&pPool->StatTrackFreeUpOneUser);
2929	/*
2930	* Just free cached pages in a braindead fashion.
2931	*/
2932	/** @todo walk the age list backwards and free the first with usage. */
2933	int rc = VINF_SUCCESS;
2934	do
2935	{
2936	int rc2 = pgmPoolCacheFreeOne(pPool, iUser);
2937	if (RT_FAILURE(rc2) && rc == VINF_SUCCESS)
2938	rc = rc2;
2939	} while (pPool->iUserFreeHead == NIL_PGMPOOL_USER_INDEX);
2940	return rc;
2941	}
2942
2943
2944	/**
2945	* Inserts a page into the cache.
2946	*
2947	* This will create user node for the page, insert it into the GCPhys
2948	* hash, and insert it into the age list.
2949	*
2950	* @returns VBox status code.
2951	* @retval VINF_SUCCESS if successfully added.
2952	* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
2953	* @param pPool The pool.
2954	* @param pPage The cached page.
2955	* @param GCPhys The GC physical address of the page we're gonna shadow.
2956	* @param iUser The user index.
2957	* @param iUserTable The user table index.
2958	*/
2959	DECLINLINE(int) pgmPoolTrackInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhys, uint16_t iUser, uint32_t iUserTable)
2960	{
2961	int rc = VINF_SUCCESS;
2962	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
2963
2964	LogFlow(("pgmPoolTrackInsert GCPhys=%RGp iUser=%d iUserTable=%x\n", GCPhys, iUser, iUserTable)); RT_NOREF_PV(GCPhys);
2965
2966	if (iUser != NIL_PGMPOOL_IDX)
2967	{
2968	#ifdef VBOX_STRICT
2969	/*
2970	* Check that the entry doesn't already exists.
2971	*/
2972	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
2973	{
2974	uint16_t i = pPage->iUserHead;
2975	do
2976	{
2977	Assert(i < pPool->cMaxUsers);
2978	AssertMsg(paUsers[i].iUser != iUser \|\| paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
2979	i = paUsers[i].iNext;
2980	} while (i != NIL_PGMPOOL_USER_INDEX);
2981	}
2982	#endif
2983
2984	/*
2985	* Find free a user node.
2986	*/
2987	uint16_t i = pPool->iUserFreeHead;
2988	if (i == NIL_PGMPOOL_USER_INDEX)
2989	{
2990	rc = pgmPoolTrackFreeOneUser(pPool, iUser);
2991	if (RT_FAILURE(rc))
2992	return rc;
2993	i = pPool->iUserFreeHead;
2994	}
2995
2996	/*
2997	* Unlink the user node from the free list,
2998	* initialize and insert it into the user list.
2999	*/
3000	pPool->iUserFreeHead = paUsers[i].iNext;
3001	paUsers[i].iNext = NIL_PGMPOOL_USER_INDEX;
3002	paUsers[i].iUser = iUser;
3003	paUsers[i].iUserTable = iUserTable;
3004	pPage->iUserHead = i;
3005	}
3006	else
3007	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
3008
3009
3010	/*
3011	* Insert into cache and enable monitoring of the guest page if enabled.
3012	*
3013	* Until we implement caching of all levels, including the CR3 one, we'll
3014	* have to make sure we don't try monitor & cache any recursive reuse of
3015	* a monitored CR3 page. Because all windows versions are doing this we'll
3016	* have to be able to do combined access monitoring, CR3 + PT and
3017	* PD + PT (guest PAE).
3018	*
3019	* Update:
3020	* We're now cooperating with the CR3 monitor if an uncachable page is found.
3021	*/
3022	const bool fCanBeMonitored = true;
3023	pgmPoolCacheInsert(pPool, pPage, fCanBeMonitored); /* This can be expanded. */
3024	if (fCanBeMonitored)
3025	{
3026	rc = pgmPoolMonitorInsert(pPool, pPage);
3027	AssertRC(rc);
3028	}
3029	return rc;
3030	}
3031
3032
3033	/**
3034	* Adds a user reference to a page.
3035	*
3036	* This will move the page to the head of the
3037	*
3038	* @returns VBox status code.
3039	* @retval VINF_SUCCESS if successfully added.
3040	* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
3041	* @param pPool The pool.
3042	* @param pPage The cached page.
3043	* @param iUser The user index.
3044	* @param iUserTable The user table.
3045	*/
3046	static int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
3047	{
3048	Log3(("pgmPoolTrackAddUser: GCPhys=%RGp iUser=%x iUserTable=%x\n", pPage->GCPhys, iUser, iUserTable));
3049	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
3050	Assert(iUser != NIL_PGMPOOL_IDX);
3051
3052	# ifdef VBOX_STRICT
3053	/*
3054	* Check that the entry doesn't already exists. We only allow multiple
3055	* users of top-level paging structures (SHW_POOL_ROOT_IDX).
3056	*/
3057	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
3058	{
3059	uint16_t i = pPage->iUserHead;
3060	do
3061	{
3062	Assert(i < pPool->cMaxUsers);
3063	/** @todo this assertion looks odd... Shouldn't it be && here? */
3064	AssertMsg(paUsers[i].iUser != iUser \|\| paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
3065	i = paUsers[i].iNext;
3066	} while (i != NIL_PGMPOOL_USER_INDEX);
3067	}
3068	# endif
3069
3070	/*
3071	* Allocate a user node.
3072	*/
3073	uint16_t i = pPool->iUserFreeHead;
3074	if (i == NIL_PGMPOOL_USER_INDEX)
3075	{
3076	int rc = pgmPoolTrackFreeOneUser(pPool, iUser);
3077	if (RT_FAILURE(rc))
3078	return rc;
3079	i = pPool->iUserFreeHead;
3080	}
3081	pPool->iUserFreeHead = paUsers[i].iNext;
3082
3083	/*
3084	* Initialize the user node and insert it.
3085	*/
3086	paUsers[i].iNext = pPage->iUserHead;
3087	paUsers[i].iUser = iUser;
3088	paUsers[i].iUserTable = iUserTable;
3089	pPage->iUserHead = i;
3090
3091	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
3092	if (pPage->fDirty)
3093	pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPage->idxDirtyEntry, false /* do not remove */);
3094	# endif
3095
3096	/*
3097	* Tell the cache to update its replacement stats for this page.
3098	*/
3099	pgmPoolCacheUsed(pPool, pPage);
3100	return VINF_SUCCESS;
3101	}
3102
3103
3104	/**
3105	* Frees a user record associated with a page.
3106	*
3107	* This does not clear the entry in the user table, it simply replaces the
3108	* user record to the chain of free records.
3109	*
3110	* @param pPool The pool.
3111	* @param pPage The shadow page.
3112	* @param iUser The shadow page pool index of the user table.
3113	* @param iUserTable The index into the user table (shadowed).
3114	*
3115	* @remarks Don't call this for root pages.
3116	*/
3117	static void pgmPoolTrackFreeUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
3118	{
3119	Log3(("pgmPoolTrackFreeUser %RGp %x %x\n", pPage->GCPhys, iUser, iUserTable));
3120	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
3121	Assert(iUser != NIL_PGMPOOL_IDX);
3122
3123	/*
3124	* Unlink and free the specified user entry.
3125	*/
3126
3127	/* Special: For PAE and 32-bit paging, there is usually no more than one user. */
3128	uint16_t i = pPage->iUserHead;
3129	if ( i != NIL_PGMPOOL_USER_INDEX
3130	&& paUsers[i].iUser == iUser
3131	&& paUsers[i].iUserTable == iUserTable)
3132	{
3133	pPage->iUserHead = paUsers[i].iNext;
3134
3135	paUsers[i].iUser = NIL_PGMPOOL_IDX;
3136	paUsers[i].iNext = pPool->iUserFreeHead;
3137	pPool->iUserFreeHead = i;
3138	return;
3139	}
3140
3141	/* General: Linear search. */
3142	uint16_t iPrev = NIL_PGMPOOL_USER_INDEX;
3143	while (i != NIL_PGMPOOL_USER_INDEX)
3144	{
3145	if ( paUsers[i].iUser == iUser
3146	&& paUsers[i].iUserTable == iUserTable)
3147	{
3148	if (iPrev != NIL_PGMPOOL_USER_INDEX)
3149	paUsers[iPrev].iNext = paUsers[i].iNext;
3150	else
3151	pPage->iUserHead = paUsers[i].iNext;
3152
3153	paUsers[i].iUser = NIL_PGMPOOL_IDX;
3154	paUsers[i].iNext = pPool->iUserFreeHead;
3155	pPool->iUserFreeHead = i;
3156	return;
3157	}
3158	iPrev = i;
3159	i = paUsers[i].iNext;
3160	}
3161
3162	/* Fatal: didn't find it */
3163	AssertFatalMsgFailed(("Didn't find the user entry! iUser=%d iUserTable=%#x GCPhys=%RGp\n",
3164	iUser, iUserTable, pPage->GCPhys));
3165	}
3166
3167
3168	#if 0 /* unused */
3169	/**
3170	* Gets the entry size of a shadow table.
3171	*
3172	* @param enmKind The kind of page.
3173	*
3174	* @returns The size of the entry in bytes. That is, 4 or 8.
3175	* @returns If the kind is not for a table, an assertion is raised and 0 is
3176	* returned.
3177	*/
3178	DECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind)
3179	{
3180	switch (enmKind)
3181	{
3182	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3183	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3184	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3185	case PGMPOOLKIND_32BIT_PD:
3186	case PGMPOOLKIND_32BIT_PD_PHYS:
3187	return 4;
3188
3189	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3190	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3191	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3192	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3193	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3194	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3195	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3196	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3197	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3198	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3199	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3200	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3201	case PGMPOOLKIND_64BIT_PML4:
3202	case PGMPOOLKIND_PAE_PDPT:
3203	case PGMPOOLKIND_ROOT_NESTED:
3204	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3205	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3206	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
3207	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3208	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3209	case PGMPOOLKIND_PAE_PD_PHYS:
3210	case PGMPOOLKIND_PAE_PDPT_PHYS:
3211	return 8;
3212
3213	default:
3214	AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
3215	}
3216	}
3217	#endif /* unused */
3218
3219	#if 0 /* unused */
3220	/**
3221	* Gets the entry size of a guest table.
3222	*
3223	* @param enmKind The kind of page.
3224	*
3225	* @returns The size of the entry in bytes. That is, 0, 4 or 8.
3226	* @returns If the kind is not for a table, an assertion is raised and 0 is
3227	* returned.
3228	*/
3229	DECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind)
3230	{
3231	switch (enmKind)
3232	{
3233	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3234	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3235	case PGMPOOLKIND_32BIT_PD:
3236	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3237	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3238	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3239	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3240	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3241	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3242	return 4;
3243
3244	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3245	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3246	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3247	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3248	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3249	case PGMPOOLKIND_64BIT_PML4:
3250	case PGMPOOLKIND_PAE_PDPT:
3251	return 8;
3252
3253	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3254	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3255	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3256	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3257	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
3258	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3259	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3260	case PGMPOOLKIND_ROOT_NESTED:
3261	case PGMPOOLKIND_PAE_PD_PHYS:
3262	case PGMPOOLKIND_PAE_PDPT_PHYS:
3263	case PGMPOOLKIND_32BIT_PD_PHYS:
3264	/** @todo can we return 0? (nobody is calling this...) */
3265	AssertFailed();
3266	return 0;
3267
3268	default:
3269	AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
3270	}
3271	}
3272	#endif /* unused */
3273
3274
3275	/**
3276	* Checks one shadow page table entry for a mapping of a physical page.
3277	*
3278	* @returns true / false indicating removal of all relevant PTEs
3279	*
3280	* @param pVM The cross context VM structure.
3281	* @param pPhysPage The guest page in question.
3282	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3283	* @param iShw The shadow page table.
3284	* @param iPte Page table entry or NIL_PGMPOOL_PHYSEXT_IDX_PTE if unknown
3285	*/
3286	static bool pgmPoolTrackFlushGCPhysPTInt(PVM pVM, PCPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw, uint16_t iPte)
3287	{
3288	LogFlow(("pgmPoolTrackFlushGCPhysPTInt: pPhysPage=%RHp iShw=%d iPte=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw, iPte));
3289	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3290	bool fRet = false;
3291
3292	/*
3293	* Assert sanity.
3294	*/
3295	Assert(iPte != NIL_PGMPOOL_PHYSEXT_IDX_PTE);
3296	AssertFatalMsg(iShw < pPool->cCurPages && iShw != NIL_PGMPOOL_IDX, ("iShw=%d\n", iShw));
3297	PPGMPOOLPAGE pPage = &pPool->aPages[iShw];
3298
3299	/*
3300	* Then, clear the actual mappings to the page in the shadow PT.
3301	*/
3302	switch (pPage->enmKind)
3303	{
3304	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3305	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3306	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3307	{
3308	const uint32_t u32 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PTE_P;
3309	PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3310	uint32_t u32AndMask = 0;
3311	uint32_t u32OrMask = 0;
3312
3313	if (!fFlushPTEs)
3314	{
3315	switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
3316	{
3317	case PGM_PAGE_HNDL_PHYS_STATE_NONE: /** No handler installed. */
3318	case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /** Monitoring is temporarily disabled. */
3319	u32OrMask = X86_PTE_RW;
3320	u32AndMask = UINT32_MAX;
3321	fRet = true;
3322	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3323	break;
3324
3325	case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /** Write access is monitored. */
3326	u32OrMask = 0;
3327	u32AndMask = ~X86_PTE_RW;
3328	fRet = true;
3329	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3330	break;
3331	default:
3332	/* (shouldn't be here, will assert below) */
3333	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3334	break;
3335	}
3336	}
3337	else
3338	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3339
3340	/* Update the counter if we're removing references. */
3341	if (!u32AndMask)
3342	{
3343	Assert(pPage->cPresent);
3344	Assert(pPool->cPresent);
3345	pPage->cPresent--;
3346	pPool->cPresent--;
3347	}
3348
3349	if ((pPT->a[iPte].u & (X86_PTE_PG_MASK \| X86_PTE_P)) == u32)
3350	{
3351	X86PTE Pte;
3352
3353	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX32\n", iPte, pPT->a[iPte]));
3354	Pte.u = (pPT->a[iPte].u & u32AndMask) \| u32OrMask;
3355	if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
3356	Pte.n.u1Write = 0; /* need to disallow writes when dirty bit tracking is still active. */
3357
3358	ASMAtomicWriteU32(&pPT->a[iPte].u, Pte.u);
3359	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3360	return fRet;
3361	}
3362	#ifdef LOG_ENABLED
3363	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3364	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPT->a); i++)
3365	if ((pPT->a[i].u & (X86_PTE_PG_MASK \| X86_PTE_P)) == u32)
3366	{
3367	Log(("i=%d cFound=%d\n", i, ++cFound));
3368	}
3369	#endif
3370	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d u32=%RX32 poolkind=%x\n", pPage->iFirstPresent, pPage->cPresent, u32, pPage->enmKind));
3371	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);/
3372	break;
3373	}
3374
3375	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3376	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3377	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3378	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3379	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3380	case PGMPOOLKIND_EPT_PT_FOR_PHYS: /* physical mask the same as PAE; RW bit as well; be careful! */
3381	{
3382	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PTE_P;
3383	PPGMSHWPTPAE pPT = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3384	uint64_t u64OrMask = 0;
3385	uint64_t u64AndMask = 0;
3386
3387	if (!fFlushPTEs)
3388	{
3389	switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
3390	{
3391	case PGM_PAGE_HNDL_PHYS_STATE_NONE: /* No handler installed. */
3392	case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /* Monitoring is temporarily disabled. */
3393	u64OrMask = X86_PTE_RW;
3394	u64AndMask = UINT64_MAX;
3395	fRet = true;
3396	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3397	break;
3398
3399	case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /* Write access is monitored. */
3400	u64OrMask = 0;
3401	u64AndMask = ~(uint64_t)X86_PTE_RW;
3402	fRet = true;
3403	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3404	break;
3405
3406	default:
3407	/* (shouldn't be here, will assert below) */
3408	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3409	break;
3410	}
3411	}
3412	else
3413	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3414
3415	/* Update the counter if we're removing references. */
3416	if (!u64AndMask)
3417	{
3418	Assert(pPage->cPresent);
3419	Assert(pPool->cPresent);
3420	pPage->cPresent--;
3421	pPool->cPresent--;
3422	}
3423
3424	if ((PGMSHWPTEPAE_GET_U(pPT->a[iPte]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P \| X86_PTE_PAE_MBZ_MASK_NX)) == u64)
3425	{
3426	X86PTEPAE Pte;
3427
3428	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX64\n", iPte, PGMSHWPTEPAE_GET_LOG(pPT->a[iPte])));
3429	Pte.u = (PGMSHWPTEPAE_GET_U(pPT->a[iPte]) & u64AndMask) \| u64OrMask;
3430	if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
3431	Pte.n.u1Write = 0; /* need to disallow writes when dirty bit tracking is still active. */
3432
3433	PGMSHWPTEPAE_ATOMIC_SET(pPT->a[iPte], Pte.u);
3434	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3435	return fRet;
3436	}
3437	#ifdef LOG_ENABLED
3438	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3439	Log(("Found %RX64 expected %RX64\n", PGMSHWPTEPAE_GET_U(pPT->a[iPte]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P \| X86_PTE_PAE_MBZ_MASK_NX), u64));
3440	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPT->a); i++)
3441	if ((PGMSHWPTEPAE_GET_U(pPT->a[i]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P \| X86_PTE_PAE_MBZ_MASK_NX)) == u64)
3442	Log(("i=%d cFound=%d\n", i, ++cFound));
3443	#endif
3444	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d u64=%RX64 poolkind=%x iPte=%d PT=%RX64\n", pPage->iFirstPresent, pPage->cPresent, u64, pPage->enmKind, iPte, PGMSHWPTEPAE_GET_LOG(pPT->a[iPte])));
3445	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);/
3446	break;
3447	}
3448
3449	#ifdef PGM_WITH_LARGE_PAGES
3450	/* Large page case only. */
3451	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3452	{
3453	Assert(pVM->pgm.s.fNestedPaging);
3454
3455	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PDE4M_P \| X86_PDE4M_PS;
3456	PEPTPD pPD = (PEPTPD)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3457
3458	if ((pPD->a[iPte].u & (EPT_PDE2M_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3459	{
3460	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pde=%RX64\n", iPte, pPD->a[iPte]));
3461	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3462	pPD->a[iPte].u = 0;
3463	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);
3464
3465	/* Update the counter as we're removing references. */
3466	Assert(pPage->cPresent);
3467	Assert(pPool->cPresent);
3468	pPage->cPresent--;
3469	pPool->cPresent--;
3470
3471	return fRet;
3472	}
3473	# ifdef LOG_ENABLED
3474	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3475	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPD->a); i++)
3476	if ((pPD->a[i].u & (EPT_PDE2M_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3477	Log(("i=%d cFound=%d\n", i, ++cFound));
3478	# endif
3479	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3480	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);/
3481	break;
3482	}
3483
3484	/* AMD-V nested paging / /* @todo merge with EPT as we only check the parts that are identical. */
3485	case PGMPOOLKIND_PAE_PD_PHYS:
3486	{
3487	Assert(pVM->pgm.s.fNestedPaging);
3488
3489	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PDE4M_P \| X86_PDE4M_PS;
3490	PX86PD pPD = (PX86PD)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3491
3492	if ((pPD->a[iPte].u & (X86_PDE2M_PAE_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3493	{
3494	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pde=%RX64\n", iPte, pPD->a[iPte]));
3495	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3496	pPD->a[iPte].u = 0;
3497	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);
3498
3499	/* Update the counter as we're removing references. */
3500	Assert(pPage->cPresent);
3501	Assert(pPool->cPresent);
3502	pPage->cPresent--;
3503	pPool->cPresent--;
3504	return fRet;
3505	}
3506	# ifdef LOG_ENABLED
3507	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3508	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPD->a); i++)
3509	if ((pPD->a[i].u & (X86_PDE2M_PAE_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3510	Log(("i=%d cFound=%d\n", i, ++cFound));
3511	# endif
3512	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3513	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);/
3514	break;
3515	}
3516	#endif /* PGM_WITH_LARGE_PAGES */
3517
3518	default:
3519	AssertFatalMsgFailed(("enmKind=%d iShw=%d\n", pPage->enmKind, iShw));
3520	}
3521
3522	/* not reached. */
3523	#ifndef _MSC_VER
3524	return fRet;
3525	#endif
3526	}
3527
3528
3529	/**
3530	* Scans one shadow page table for mappings of a physical page.
3531	*
3532	* @param pVM The cross context VM structure.
3533	* @param pPhysPage The guest page in question.
3534	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3535	* @param iShw The shadow page table.
3536	*/
3537	static void pgmPoolTrackFlushGCPhysPT(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw)
3538	{
3539	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
3540
3541	/* We should only come here with when there's only one reference to this physical page. */
3542	Assert(PGMPOOL_TD_GET_CREFS(PGM_PAGE_GET_TRACKING(pPhysPage)) == 1);
3543
3544	Log2(("pgmPoolTrackFlushGCPhysPT: pPhysPage=%RHp iShw=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw));
3545	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPT, f);
3546	bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, iShw, PGM_PAGE_GET_PTE_INDEX(pPhysPage));
3547	if (!fKeptPTEs)
3548	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3549	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPT, f);
3550	}
3551
3552
3553	/**
3554	* Flushes a list of shadow page tables mapping the same physical page.
3555	*
3556	* @param pVM The cross context VM structure.
3557	* @param pPhysPage The guest page in question.
3558	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3559	* @param iPhysExt The physical cross reference extent list to flush.
3560	*/
3561	static void pgmPoolTrackFlushGCPhysPTs(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iPhysExt)
3562	{
3563	PGM_LOCK_ASSERT_OWNER(pVM);
3564	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3565	bool fKeepList = false;
3566
3567	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTs, f);
3568	Log2(("pgmPoolTrackFlushGCPhysPTs: pPhysPage=%RHp iPhysExt=%u\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iPhysExt));
3569
3570	const uint16_t iPhysExtStart = iPhysExt;
3571	PPGMPOOLPHYSEXT pPhysExt;
3572	do
3573	{
3574	Assert(iPhysExt < pPool->cMaxPhysExts);
3575	pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
3576	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
3577	{
3578	if (pPhysExt->aidx[i] != NIL_PGMPOOL_IDX)
3579	{
3580	bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, pPhysExt->aidx[i], pPhysExt->apte[i]);
3581	if (!fKeptPTEs)
3582	{
3583	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
3584	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
3585	}
3586	else
3587	fKeepList = true;
3588	}
3589	}
3590	/* next */
3591	iPhysExt = pPhysExt->iNext;
3592	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
3593
3594	if (!fKeepList)
3595	{
3596	/* insert the list into the free list and clear the ram range entry. */
3597	pPhysExt->iNext = pPool->iPhysExtFreeHead;
3598	pPool->iPhysExtFreeHead = iPhysExtStart;
3599	/* Invalidate the tracking data. */
3600	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3601	}
3602
3603	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTs, f);
3604	}
3605
3606
3607	/**
3608	* Flushes all shadow page table mappings of the given guest page.
3609	*
3610	* This is typically called when the host page backing the guest one has been
3611	* replaced or when the page protection was changed due to a guest access
3612	* caught by the monitoring.
3613	*
3614	* @returns VBox status code.
3615	* @retval VINF_SUCCESS if all references has been successfully cleared.
3616	* @retval VINF_PGM_SYNC_CR3 if we're better off with a CR3 sync and a page
3617	* pool cleaning. FF and sync flags are set.
3618	*
3619	* @param pVM The cross context VM structure.
3620	* @param GCPhysPage GC physical address of the page in question
3621	* @param pPhysPage The guest page in question.
3622	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3623	* @param pfFlushTLBs This is set to @a true if the shadow TLBs should be
3624	* flushed, it is NOT touched if this isn't necessary.
3625	* The caller MUST initialized this to @a false.
3626	*/
3627	int pgmPoolTrackUpdateGCPhys(PVM pVM, RTGCPHYS GCPhysPage, PPGMPAGE pPhysPage, bool fFlushPTEs, bool *pfFlushTLBs)
3628	{
3629	PVMCPU pVCpu = VMMGetCpu(pVM);
3630	pgmLock(pVM);
3631	int rc = VINF_SUCCESS;
3632
3633	#ifdef PGM_WITH_LARGE_PAGES
3634	/* Is this page part of a large page? */
3635	if (PGM_PAGE_GET_PDE_TYPE(pPhysPage) == PGM_PAGE_PDE_TYPE_PDE)
3636	{
3637	RTGCPHYS GCPhysBase = GCPhysPage & X86_PDE2M_PAE_PG_MASK;
3638	GCPhysPage &= X86_PDE_PAE_PG_MASK;
3639
3640	/* Fetch the large page base. */
3641	PPGMPAGE pLargePage;
3642	if (GCPhysBase != GCPhysPage)
3643	{
3644	pLargePage = pgmPhysGetPage(pVM, GCPhysBase);
3645	AssertFatal(pLargePage);
3646	}
3647	else
3648	pLargePage = pPhysPage;
3649
3650	Log(("pgmPoolTrackUpdateGCPhys: update large page PDE for %RGp (%RGp)\n", GCPhysBase, GCPhysPage));
3651
3652	if (PGM_PAGE_GET_PDE_TYPE(pLargePage) == PGM_PAGE_PDE_TYPE_PDE)
3653	{
3654	/* Mark the large page as disabled as we need to break it up to change a single page in the 2 MB range. */
3655	PGM_PAGE_SET_PDE_TYPE(pVM, pLargePage, PGM_PAGE_PDE_TYPE_PDE_DISABLED);
3656	pVM->pgm.s.cLargePagesDisabled++;
3657
3658	/* Update the base as that only that one has a reference and there's only one PDE to clear. */
3659	rc = pgmPoolTrackUpdateGCPhys(pVM, GCPhysBase, pLargePage, fFlushPTEs, pfFlushTLBs);
3660
3661	*pfFlushTLBs = true;
3662	pgmUnlock(pVM);
3663	return rc;
3664	}
3665	}
3666	#else
3667	NOREF(GCPhysPage);
3668	#endif /* PGM_WITH_LARGE_PAGES */
3669
3670	const uint16_t u16 = PGM_PAGE_GET_TRACKING(pPhysPage);
3671	if (u16)
3672	{
3673	/*
3674	* The zero page is currently screwing up the tracking and we'll
3675	* have to flush the whole shebang. Unless VBOX_WITH_NEW_LAZY_PAGE_ALLOC
3676	* is defined, zero pages won't normally be mapped. Some kind of solution
3677	* will be needed for this problem of course, but it will have to wait...
3678	*/
3679	if ( PGM_PAGE_IS_ZERO(pPhysPage)
3680	\|\| PGM_PAGE_IS_BALLOONED(pPhysPage))
3681	rc = VINF_PGM_GCPHYS_ALIASED;
3682	else
3683	{
3684	# if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC) /** @todo we can drop this now. */
3685	/* Start a subset here because pgmPoolTrackFlushGCPhysPTsSlow and
3686	pgmPoolTrackFlushGCPhysPTs will/may kill the pool otherwise. */
3687	uint32_t iPrevSubset = PGMRZDynMapPushAutoSubset(pVCpu);
3688	# endif
3689
3690	if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
3691	{
3692	Assert(PGMPOOL_TD_GET_CREFS(u16) == 1);
3693	pgmPoolTrackFlushGCPhysPT(pVM,
3694	pPhysPage,
3695	fFlushPTEs,
3696	PGMPOOL_TD_GET_IDX(u16));
3697	}
3698	else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
3699	pgmPoolTrackFlushGCPhysPTs(pVM, pPhysPage, fFlushPTEs, PGMPOOL_TD_GET_IDX(u16));
3700	else
3701	rc = pgmPoolTrackFlushGCPhysPTsSlow(pVM, pPhysPage);
3702	*pfFlushTLBs = true;
3703
3704	# if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
3705	PGMRZDynMapPopAutoSubset(pVCpu, iPrevSubset);
3706	# endif
3707	}
3708	}
3709
3710	if (rc == VINF_PGM_GCPHYS_ALIASED)
3711	{
3712	pVCpu->pgm.s.fSyncFlags \|= PGM_SYNC_CLEAR_PGM_POOL;
3713	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
3714	rc = VINF_PGM_SYNC_CR3;
3715	}
3716	pgmUnlock(pVM);
3717	return rc;
3718	}
3719
3720
3721	/**
3722	* Scans all shadow page tables for mappings of a physical page.
3723	*
3724	* This may be slow, but it's most likely more efficient than cleaning
3725	* out the entire page pool / cache.
3726	*
3727	* @returns VBox status code.
3728	* @retval VINF_SUCCESS if all references has been successfully cleared.
3729	* @retval VINF_PGM_GCPHYS_ALIASED if we're better off with a CR3 sync and
3730	* a page pool cleaning.
3731	*
3732	* @param pVM The cross context VM structure.
3733	* @param pPhysPage The guest page in question.
3734	*/
3735	int pgmPoolTrackFlushGCPhysPTsSlow(PVM pVM, PPGMPAGE pPhysPage)
3736	{
3737	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3738	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3739	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: cUsedPages=%d cPresent=%d pPhysPage=%R[pgmpage]\n",
3740	pPool->cUsedPages, pPool->cPresent, pPhysPage));
3741
3742	/*
3743	* There is a limit to what makes sense.
3744	*/
3745	if ( pPool->cPresent > 1024
3746	&& pVM->cCpus == 1)
3747	{
3748	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: giving up... (cPresent=%d)\n", pPool->cPresent));
3749	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3750	return VINF_PGM_GCPHYS_ALIASED;
3751	}
3752
3753	/*
3754	* Iterate all the pages until we've encountered all that in use.
3755	* This is simple but not quite optimal solution.
3756	*/
3757	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PTE_P; /** @todo drop X86_PTE_P here as we always test if present separately, anyway. */
3758	const uint32_t u32 = u64; /** @todo move into the 32BIT_PT_xx case */
3759	unsigned cLeft = pPool->cUsedPages;
3760	unsigned iPage = pPool->cCurPages;
3761	while (--iPage >= PGMPOOL_IDX_FIRST)
3762	{
3763	PPGMPOOLPAGE pPage = &pPool->aPages[iPage];
3764	if ( pPage->GCPhys != NIL_RTGCPHYS
3765	&& pPage->cPresent)
3766	{
3767	switch (pPage->enmKind)
3768	{
3769	/*
3770	* We only care about shadow page tables.
3771	*/
3772	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3773	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3774	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3775	{
3776	unsigned cPresent = pPage->cPresent;
3777	PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3778	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3779	if (pPT->a[i].n.u1Present)
3780	{
3781	if ((pPT->a[i].u & (X86_PTE_PG_MASK \| X86_PTE_P)) == u32)
3782	{
3783	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX32\n", iPage, i, pPT->a[i]));
3784	pPT->a[i].u = 0;
3785
3786	/* Update the counter as we're removing references. */
3787	Assert(pPage->cPresent);
3788	Assert(pPool->cPresent);
3789	pPage->cPresent--;
3790	pPool->cPresent--;
3791	}
3792	if (!--cPresent)
3793	break;
3794	}
3795	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3796	break;
3797	}
3798
3799	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3800	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3801	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3802	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3803	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3804	{
3805	unsigned cPresent = pPage->cPresent;
3806	PPGMSHWPTPAE pPT = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3807	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3808	if (PGMSHWPTEPAE_IS_P(pPT->a[i]))
3809	{
3810	if ((PGMSHWPTEPAE_GET_U(pPT->a[i]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P)) == u64)
3811	{
3812	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX64\n", iPage, i, pPT->a[i]));
3813	PGMSHWPTEPAE_SET(pPT->a[i], 0); /// @todo why not atomic?
3814
3815	/* Update the counter as we're removing references. */
3816	Assert(pPage->cPresent);
3817	Assert(pPool->cPresent);
3818	pPage->cPresent--;
3819	pPool->cPresent--;
3820	}
3821	if (!--cPresent)
3822	break;
3823	}
3824	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3825	break;
3826	}
3827	#ifndef IN_RC
3828	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3829	{
3830	unsigned cPresent = pPage->cPresent;
3831	PEPTPT pPT = (PEPTPT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3832	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3833	if (pPT->a[i].n.u1Present)
3834	{
3835	if ((pPT->a[i].u & (EPT_PTE_PG_MASK \| X86_PTE_P)) == u64)
3836	{
3837	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX64\n", iPage, i, pPT->a[i]));
3838	pPT->a[i].u = 0;
3839
3840	/* Update the counter as we're removing references. */
3841	Assert(pPage->cPresent);
3842	Assert(pPool->cPresent);
3843	pPage->cPresent--;
3844	pPool->cPresent--;
3845	}
3846	if (!--cPresent)
3847	break;
3848	}
3849	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3850	break;
3851	}
3852	#endif
3853	}
3854	if (!--cLeft)
3855	break;
3856	}
3857	}
3858
3859	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3860	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3861
3862	/*
3863	* There is a limit to what makes sense. The above search is very expensive, so force a pgm pool flush.
3864	*/
3865	if (pPool->cPresent > 1024)
3866	{
3867	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: giving up... (cPresent=%d)\n", pPool->cPresent));
3868	return VINF_PGM_GCPHYS_ALIASED;
3869	}
3870
3871	return VINF_SUCCESS;
3872	}
3873
3874
3875	/**
3876	* Clears the user entry in a user table.
3877	*
3878	* This is used to remove all references to a page when flushing it.
3879	*/
3880	static void pgmPoolTrackClearPageUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PCPGMPOOLUSER pUser)
3881	{
3882	Assert(pUser->iUser != NIL_PGMPOOL_IDX);
3883	Assert(pUser->iUser < pPool->cCurPages);
3884	uint32_t iUserTable = pUser->iUserTable;
3885
3886	/*
3887	* Map the user page. Ignore references made by fictitious pages.
3888	*/
3889	PPGMPOOLPAGE pUserPage = &pPool->aPages[pUser->iUser];
3890	LogFlow(("pgmPoolTrackClearPageUser: clear %x in %s (%RGp) (flushing %s)\n", iUserTable, pgmPoolPoolKindToStr(pUserPage->enmKind), pUserPage->Core.Key, pgmPoolPoolKindToStr(pPage->enmKind)));
3891	union
3892	{
3893	uint64_t *pau64;
3894	uint32_t *pau32;
3895	} u;
3896	if (pUserPage->idx < PGMPOOL_IDX_FIRST)
3897	{
3898	Assert(!pUserPage->pvPageR3);
3899	return;
3900	}
3901	u.pau64 = (uint64_t *)PGMPOOL_PAGE_2_PTR(pPool->CTX_SUFF(pVM), pUserPage);
3902
3903
3904	/* Safety precaution in case we change the paging for other modes too in the future. */
3905	Assert(!pgmPoolIsPageLocked(pPage)); RT_NOREF_PV(pPage);
3906
3907	#ifdef VBOX_STRICT
3908	/*
3909	* Some sanity checks.
3910	*/
3911	switch (pUserPage->enmKind)
3912	{
3913	case PGMPOOLKIND_32BIT_PD:
3914	case PGMPOOLKIND_32BIT_PD_PHYS:
3915	Assert(iUserTable < X86_PG_ENTRIES);
3916	break;
3917	case PGMPOOLKIND_PAE_PDPT:
3918	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
3919	case PGMPOOLKIND_PAE_PDPT_PHYS:
3920	Assert(iUserTable < 4);
3921	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
3922	break;
3923	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3924	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3925	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3926	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3927	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3928	case PGMPOOLKIND_PAE_PD_PHYS:
3929	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3930	break;
3931	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3932	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3933	Assert(!(u.pau64[iUserTable] & PGM_PDFLAGS_MAPPING));
3934	break;
3935	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3936	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3937	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
3938	break;
3939	case PGMPOOLKIND_64BIT_PML4:
3940	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
3941	/* GCPhys >> PAGE_SHIFT is the index here */
3942	break;
3943	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3944	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3945	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3946	break;
3947
3948	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
3949	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3950	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3951	break;
3952
3953	case PGMPOOLKIND_ROOT_NESTED:
3954	Assert(iUserTable < X86_PG_PAE_ENTRIES);
3955	break;
3956
3957	default:
3958	AssertMsgFailed(("enmKind=%d\n", pUserPage->enmKind));
3959	break;
3960	}
3961	#endif /* VBOX_STRICT */
3962
3963	/*
3964	* Clear the entry in the user page.
3965	*/
3966	switch (pUserPage->enmKind)
3967	{
3968	/* 32-bit entries */
3969	case PGMPOOLKIND_32BIT_PD:
3970	case PGMPOOLKIND_32BIT_PD_PHYS:
3971	ASMAtomicWriteU32(&u.pau32[iUserTable], 0);
3972	break;
3973
3974	/* 64-bit entries */
3975	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3976	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3977	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3978	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3979	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3980	#ifdef IN_RC
3981	/*
3982	* In 32 bits PAE mode we must invalidate the TLB when changing a
3983	* PDPT entry; the CPU fetches them only during cr3 load, so any
3984	* non-present PDPT will continue to cause page faults.
3985	*/
3986	ASMReloadCR3();
3987	#endif
3988	RT_FALL_THRU();
3989	case PGMPOOLKIND_PAE_PD_PHYS:
3990	case PGMPOOLKIND_PAE_PDPT_PHYS:
3991	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3992	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3993	case PGMPOOLKIND_64BIT_PML4:
3994	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3995	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3996	case PGMPOOLKIND_PAE_PDPT:
3997	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
3998	case PGMPOOLKIND_ROOT_NESTED:
3999	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
4000	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
4001	ASMAtomicWriteU64(&u.pau64[iUserTable], 0);
4002	break;
4003
4004	default:
4005	AssertFatalMsgFailed(("enmKind=%d iUser=%d iUserTable=%#x\n", pUserPage->enmKind, pUser->iUser, pUser->iUserTable));
4006	}
4007	PGM_DYNMAP_UNUSED_HINT_VM(pPool->CTX_SUFF(pVM), u.pau64);
4008	}
4009
4010
4011	/**
4012	* Clears all users of a page.
4013	*/
4014	static void pgmPoolTrackClearPageUsers(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
4015	{
4016	/*
4017	* Free all the user records.
4018	*/
4019	LogFlow(("pgmPoolTrackClearPageUsers %RGp\n", pPage->GCPhys));
4020
4021	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
4022	uint16_t i = pPage->iUserHead;
4023	while (i != NIL_PGMPOOL_USER_INDEX)
4024	{
4025	/* Clear enter in user table. */
4026	pgmPoolTrackClearPageUser(pPool, pPage, &paUsers[i]);
4027
4028	/* Free it. */
4029	const uint16_t iNext = paUsers[i].iNext;
4030	paUsers[i].iUser = NIL_PGMPOOL_IDX;
4031	paUsers[i].iNext = pPool->iUserFreeHead;
4032	pPool->iUserFreeHead = i;
4033
4034	/* Next. */
4035	i = iNext;
4036	}
4037	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
4038	}
4039
4040
4041	/**
4042	* Allocates a new physical cross reference extent.
4043	*
4044	* @returns Pointer to the allocated extent on success. NULL if we're out of them.
4045	* @param pVM The cross context VM structure.
4046	* @param piPhysExt Where to store the phys ext index.
4047	*/
4048	PPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVM pVM, uint16_t *piPhysExt)
4049	{
4050	PGM_LOCK_ASSERT_OWNER(pVM);
4051	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4052	uint16_t iPhysExt = pPool->iPhysExtFreeHead;
4053	if (iPhysExt == NIL_PGMPOOL_PHYSEXT_INDEX)
4054	{
4055	STAM_COUNTER_INC(&pPool->StamTrackPhysExtAllocFailures);
4056	return NULL;
4057	}
4058	PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4059	pPool->iPhysExtFreeHead = pPhysExt->iNext;
4060	pPhysExt->iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
4061	*piPhysExt = iPhysExt;
4062	return pPhysExt;
4063	}
4064
4065
4066	/**
4067	* Frees a physical cross reference extent.
4068	*
4069	* @param pVM The cross context VM structure.
4070	* @param iPhysExt The extent to free.
4071	*/
4072	void pgmPoolTrackPhysExtFree(PVM pVM, uint16_t iPhysExt)
4073	{
4074	PGM_LOCK_ASSERT_OWNER(pVM);
4075	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4076	Assert(iPhysExt < pPool->cMaxPhysExts);
4077	PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4078	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
4079	{
4080	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
4081	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4082	}
4083	pPhysExt->iNext = pPool->iPhysExtFreeHead;
4084	pPool->iPhysExtFreeHead = iPhysExt;
4085	}
4086
4087
4088	/**
4089	* Frees a physical cross reference extent.
4090	*
4091	* @param pVM The cross context VM structure.
4092	* @param iPhysExt The extent to free.
4093	*/
4094	void pgmPoolTrackPhysExtFreeList(PVM pVM, uint16_t iPhysExt)
4095	{
4096	PGM_LOCK_ASSERT_OWNER(pVM);
4097	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4098
4099	const uint16_t iPhysExtStart = iPhysExt;
4100	PPGMPOOLPHYSEXT pPhysExt;
4101	do
4102	{
4103	Assert(iPhysExt < pPool->cMaxPhysExts);
4104	pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4105	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
4106	{
4107	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
4108	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4109	}
4110
4111	/* next */
4112	iPhysExt = pPhysExt->iNext;
4113	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
4114
4115	pPhysExt->iNext = pPool->iPhysExtFreeHead;
4116	pPool->iPhysExtFreeHead = iPhysExtStart;
4117	}
4118
4119
4120	/**
4121	* Insert a reference into a list of physical cross reference extents.
4122	*
4123	* @returns The new tracking data for PGMPAGE.
4124	*
4125	* @param pVM The cross context VM structure.
4126	* @param iPhysExt The physical extent index of the list head.
4127	* @param iShwPT The shadow page table index.
4128	* @param iPte Page table entry
4129	*
4130	*/
4131	static uint16_t pgmPoolTrackPhysExtInsert(PVM pVM, uint16_t iPhysExt, uint16_t iShwPT, uint16_t iPte)
4132	{
4133	PGM_LOCK_ASSERT_OWNER(pVM);
4134	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4135	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
4136
4137	/*
4138	* Special common cases.
4139	*/
4140	if (paPhysExts[iPhysExt].aidx[1] == NIL_PGMPOOL_IDX)
4141	{
4142	paPhysExts[iPhysExt].aidx[1] = iShwPT;
4143	paPhysExts[iPhysExt].apte[1] = iPte;
4144	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackAliasedMany);
4145	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{,%d pte %d,}\n", iPhysExt, iShwPT, iPte));
4146	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4147	}
4148	if (paPhysExts[iPhysExt].aidx[2] == NIL_PGMPOOL_IDX)
4149	{
4150	paPhysExts[iPhysExt].aidx[2] = iShwPT;
4151	paPhysExts[iPhysExt].apte[2] = iPte;
4152	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackAliasedMany);
4153	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{,,%d pte %d}\n", iPhysExt, iShwPT, iPte));
4154	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4155	}
4156	AssertCompile(RT_ELEMENTS(paPhysExts[iPhysExt].aidx) == 3);
4157
4158	/*
4159	* General treatment.
4160	*/
4161	const uint16_t iPhysExtStart = iPhysExt;
4162	unsigned cMax = 15;
4163	for (;;)
4164	{
4165	Assert(iPhysExt < pPool->cMaxPhysExts);
4166	for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4167	if (paPhysExts[iPhysExt].aidx[i] == NIL_PGMPOOL_IDX)
4168	{
4169	paPhysExts[iPhysExt].aidx[i] = iShwPT;
4170	paPhysExts[iPhysExt].apte[i] = iPte;
4171	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackAliasedMany);
4172	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{%d pte %d} i=%d cMax=%d\n", iPhysExt, iShwPT, iPte, i, cMax));
4173	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtStart);
4174	}
4175	if (!--cMax)
4176	{
4177	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackOverflows);
4178	pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
4179	LogFlow(("pgmPoolTrackPhysExtInsert: overflow (1) iShwPT=%d\n", iShwPT));
4180	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4181	}
4182
4183	/* advance */
4184	iPhysExt = paPhysExts[iPhysExt].iNext;
4185	if (iPhysExt == NIL_PGMPOOL_PHYSEXT_INDEX)
4186	break;
4187	}
4188
4189	/*
4190	* Add another extent to the list.
4191	*/
4192	PPGMPOOLPHYSEXT pNew = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
4193	if (!pNew)
4194	{
4195	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackNoExtentsLeft);
4196	pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
4197	LogFlow(("pgmPoolTrackPhysExtInsert: pgmPoolTrackPhysExtAlloc failed iShwPT=%d\n", iShwPT));
4198	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4199	}
4200	pNew->iNext = iPhysExtStart;
4201	pNew->aidx[0] = iShwPT;
4202	pNew->apte[0] = iPte;
4203	LogFlow(("pgmPoolTrackPhysExtInsert: added new extent %d:{%d pte %d}->%d\n", iPhysExt, iShwPT, iPte, iPhysExtStart));
4204	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4205	}
4206
4207
4208	/**
4209	* Add a reference to guest physical page where extents are in use.
4210	*
4211	* @returns The new tracking data for PGMPAGE.
4212	*
4213	* @param pVM The cross context VM structure.
4214	* @param pPhysPage Pointer to the aPages entry in the ram range.
4215	* @param u16 The ram range flags (top 16-bits).
4216	* @param iShwPT The shadow page table index.
4217	* @param iPte Page table entry
4218	*/
4219	uint16_t pgmPoolTrackPhysExtAddref(PVM pVM, PPGMPAGE pPhysPage, uint16_t u16, uint16_t iShwPT, uint16_t iPte)
4220	{
4221	pgmLock(pVM);
4222	if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
4223	{
4224	/*
4225	* Convert to extent list.
4226	*/
4227	Assert(PGMPOOL_TD_GET_CREFS(u16) == 1);
4228	uint16_t iPhysExt;
4229	PPGMPOOLPHYSEXT pPhysExt = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
4230	if (pPhysExt)
4231	{
4232	LogFlow(("pgmPoolTrackPhysExtAddref: new extent: %d:{%d, %d}\n", iPhysExt, PGMPOOL_TD_GET_IDX(u16), iShwPT));
4233	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackAliased);
4234	pPhysExt->aidx[0] = PGMPOOL_TD_GET_IDX(u16);
4235	pPhysExt->apte[0] = PGM_PAGE_GET_PTE_INDEX(pPhysPage);
4236	pPhysExt->aidx[1] = iShwPT;
4237	pPhysExt->apte[1] = iPte;
4238	u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4239	}
4240	else
4241	u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4242	}
4243	else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
4244	{
4245	/*
4246	* Insert into the extent list.
4247	*/
4248	u16 = pgmPoolTrackPhysExtInsert(pVM, PGMPOOL_TD_GET_IDX(u16), iShwPT, iPte);
4249	}
4250	else
4251	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatTrackAliasedLots);
4252	pgmUnlock(pVM);
4253	return u16;
4254	}
4255
4256
4257	/**
4258	* Clear references to guest physical memory.
4259	*
4260	* @param pPool The pool.
4261	* @param pPage The page.
4262	* @param pPhysPage Pointer to the aPages entry in the ram range.
4263	* @param iPte Shadow PTE index
4264	*/
4265	void pgmPoolTrackPhysExtDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMPAGE pPhysPage, uint16_t iPte)
4266	{
4267	PVM pVM = pPool->CTX_SUFF(pVM);
4268	const unsigned cRefs = PGM_PAGE_GET_TD_CREFS(pPhysPage);
4269	AssertFatalMsg(cRefs == PGMPOOL_TD_CREFS_PHYSEXT, ("cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
4270
4271	uint16_t iPhysExt = PGM_PAGE_GET_TD_IDX(pPhysPage);
4272	if (iPhysExt != PGMPOOL_TD_IDX_OVERFLOWED)
4273	{
4274	pgmLock(pVM);
4275
4276	uint16_t iPhysExtPrev = NIL_PGMPOOL_PHYSEXT_INDEX;
4277	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
4278	do
4279	{
4280	Assert(iPhysExt < pPool->cMaxPhysExts);
4281
4282	/*
4283	* Look for the shadow page and check if it's all freed.
4284	*/
4285	for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4286	{
4287	if ( paPhysExts[iPhysExt].aidx[i] == pPage->idx
4288	&& paPhysExts[iPhysExt].apte[i] == iPte)
4289	{
4290	paPhysExts[iPhysExt].aidx[i] = NIL_PGMPOOL_IDX;
4291	paPhysExts[iPhysExt].apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4292
4293	for (i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4294	if (paPhysExts[iPhysExt].aidx[i] != NIL_PGMPOOL_IDX)
4295	{
4296	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d\n", pPhysPage, pPage->idx));
4297	pgmUnlock(pVM);
4298	return;
4299	}
4300
4301	/* we can free the node. */
4302	const uint16_t iPhysExtNext = paPhysExts[iPhysExt].iNext;
4303	if ( iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX
4304	&& iPhysExtNext == NIL_PGMPOOL_PHYSEXT_INDEX)
4305	{
4306	/* lonely node */
4307	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4308	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d lonely\n", pPhysPage, pPage->idx));
4309	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
4310	}
4311	else if (iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX)
4312	{
4313	/* head */
4314	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d head\n", pPhysPage, pPage->idx));
4315	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtNext));
4316	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4317	}
4318	else
4319	{
4320	/* in list */
4321	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d in list\n", pPhysPage, pPage->idx));
4322	paPhysExts[iPhysExtPrev].iNext = iPhysExtNext;
4323	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4324	}
4325	iPhysExt = iPhysExtNext;
4326	pgmUnlock(pVM);
4327	return;
4328	}
4329	}
4330
4331	/* next */
4332	iPhysExtPrev = iPhysExt;
4333	iPhysExt = paPhysExts[iPhysExt].iNext;
4334	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
4335
4336	pgmUnlock(pVM);
4337	AssertFatalMsgFailed(("not-found! cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
4338	}
4339	else /* nothing to do */
4340	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage]\n", pPhysPage));
4341	}
4342
4343	/**
4344	* Clear references to guest physical memory.
4345	*
4346	* This is the same as pgmPoolTracDerefGCPhysHint except that the guest
4347	* physical address is assumed to be correct, so the linear search can be
4348	* skipped and we can assert at an earlier point.
4349	*
4350	* @param pPool The pool.
4351	* @param pPage The page.
4352	* @param HCPhys The host physical address corresponding to the guest page.
4353	* @param GCPhys The guest physical address corresponding to HCPhys.
4354	* @param iPte Shadow PTE index
4355	*/
4356	static void pgmPoolTracDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhys, uint16_t iPte)
4357	{
4358	/*
4359	* Lookup the page and check if it checks out before derefing it.
4360	*/
4361	PVM pVM = pPool->CTX_SUFF(pVM);
4362	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhys);
4363	if (pPhysPage)
4364	{
4365	Assert(PGM_PAGE_GET_HCPHYS(pPhysPage));
4366	#ifdef LOG_ENABLED
4367	RTHCPHYS HCPhysPage = PGM_PAGE_GET_HCPHYS(pPhysPage);
4368	Log2(("pgmPoolTracDerefGCPhys %RHp vs %RHp\n", HCPhysPage, HCPhys));
4369	#endif
4370	if (PGM_PAGE_GET_HCPHYS(pPhysPage) == HCPhys)
4371	{
4372	Assert(pPage->cPresent);
4373	Assert(pPool->cPresent);
4374	pPage->cPresent--;
4375	pPool->cPresent--;
4376	pgmTrackDerefGCPhys(pPool, pPage, pPhysPage, iPte);
4377	return;
4378	}
4379
4380	AssertFatalMsgFailed(("HCPhys=%RHp GCPhys=%RGp; found page has HCPhys=%RHp\n",
4381	HCPhys, GCPhys, PGM_PAGE_GET_HCPHYS(pPhysPage)));
4382	}
4383	AssertFatalMsgFailed(("HCPhys=%RHp GCPhys=%RGp\n", HCPhys, GCPhys));
4384	}
4385
4386
4387	/**
4388	* Clear references to guest physical memory.
4389	*
4390	* @param pPool The pool.
4391	* @param pPage The page.
4392	* @param HCPhys The host physical address corresponding to the guest page.
4393	* @param GCPhysHint The guest physical address which may corresponding to HCPhys.
4394	* @param iPte Shadow pte index
4395	*/
4396	void pgmPoolTracDerefGCPhysHint(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhysHint, uint16_t iPte)
4397	{
4398	Log4(("pgmPoolTracDerefGCPhysHint %RHp %RGp\n", HCPhys, GCPhysHint));
4399
4400	/*
4401	* Try the hint first.
4402	*/
4403	RTHCPHYS HCPhysHinted;
4404	PVM pVM = pPool->CTX_SUFF(pVM);
4405	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhysHint);
4406	if (pPhysPage)
4407	{
4408	HCPhysHinted = PGM_PAGE_GET_HCPHYS(pPhysPage);
4409	Assert(HCPhysHinted);
4410	if (HCPhysHinted == HCPhys)
4411	{
4412	Assert(pPage->cPresent);
4413	Assert(pPool->cPresent);
4414	pPage->cPresent--;
4415	pPool->cPresent--;
4416	pgmTrackDerefGCPhys(pPool, pPage, pPhysPage, iPte);
4417	return;
4418	}
4419	}
4420	else
4421	HCPhysHinted = UINT64_C(0xdeadbeefdeadbeef);
4422
4423	/*
4424	* Damn, the hint didn't work. We'll have to do an expensive linear search.
4425	*/
4426	STAM_COUNTER_INC(&pPool->StatTrackLinearRamSearches);
4427	PPGMRAMRANGE pRam = pPool->CTX_SUFF(pVM)->pgm.s.CTX_SUFF(pRamRangesX);
4428	while (pRam)
4429	{
4430	unsigned iPage = pRam->cb >> PAGE_SHIFT;
4431	while (iPage-- > 0)
4432	{
4433	if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
4434	{
4435	Log4(("pgmPoolTracDerefGCPhysHint: Linear HCPhys=%RHp GCPhysHint=%RGp GCPhysReal=%RGp\n",
4436	HCPhys, GCPhysHint, pRam->GCPhys + (iPage << PAGE_SHIFT)));
4437	Assert(pPage->cPresent);
4438	Assert(pPool->cPresent);
4439	pPage->cPresent--;
4440	pPool->cPresent--;
4441	pgmTrackDerefGCPhys(pPool, pPage, &pRam->aPages[iPage], iPte);
4442	return;
4443	}
4444	}
4445	pRam = pRam->CTX_SUFF(pNext);
4446	}
4447
4448	AssertFatalMsgFailed(("HCPhys=%RHp GCPhysHint=%RGp (Hinted page has HCPhys = %RHp)\n", HCPhys, GCPhysHint, HCPhysHinted));
4449	}
4450
4451
4452	/**
4453	* Clear references to guest physical memory in a 32-bit / 32-bit page table.
4454	*
4455	* @param pPool The pool.
4456	* @param pPage The page.
4457	* @param pShwPT The shadow page table (mapping of the page).
4458	* @param pGstPT The guest page table.
4459	*/
4460	DECLINLINE(void) pgmPoolTrackDerefPT32Bit32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT, PCX86PT pGstPT)
4461	{
4462	RTGCPHYS32 const fPgMask = pPage->fA20Enabled ? X86_PTE_PG_MASK : X86_PTE_PG_MASK & ~RT_BIT_32(20);
4463	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4464	{
4465	Assert(!(pShwPT->a[i].u & RT_BIT_32(10)));
4466	if (pShwPT->a[i].n.u1Present)
4467	{
4468	Log4(("pgmPoolTrackDerefPT32Bit32Bit: i=%d pte=%RX32 hint=%RX32\n",
4469	i, pShwPT->a[i].u & X86_PTE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK));
4470	pgmPoolTracDerefGCPhysHint(pPool, pPage, pShwPT->a[i].u & X86_PTE_PG_MASK, pGstPT->a[i].u & fPgMask, i);
4471	if (!pPage->cPresent)
4472	break;
4473	}
4474	}
4475	}
4476
4477
4478	/**
4479	* Clear references to guest physical memory in a PAE / 32-bit page table.
4480	*
4481	* @param pPool The pool.
4482	* @param pPage The page.
4483	* @param pShwPT The shadow page table (mapping of the page).
4484	* @param pGstPT The guest page table (just a half one).
4485	*/
4486	DECLINLINE(void) pgmPoolTrackDerefPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT)
4487	{
4488	RTGCPHYS32 const fPgMask = pPage->fA20Enabled ? X86_PTE_PG_MASK : X86_PTE_PG_MASK & ~RT_BIT_32(20);
4489	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4490	{
4491	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4492	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4493	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4494	{
4495	Log4(("pgmPoolTrackDerefPTPae32Bit: i=%d pte=%RX64 hint=%RX32\n",
4496	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & X86_PTE_PG_MASK));
4497	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & fPgMask, i);
4498	if (!pPage->cPresent)
4499	break;
4500	}
4501	}
4502	}
4503
4504
4505	/**
4506	* Clear references to guest physical memory in a PAE / PAE page table.
4507	*
4508	* @param pPool The pool.
4509	* @param pPage The page.
4510	* @param pShwPT The shadow page table (mapping of the page).
4511	* @param pGstPT The guest page table.
4512	*/
4513	DECLINLINE(void) pgmPoolTrackDerefPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT)
4514	{
4515	RTGCPHYS const fPgMask = pPage->fA20Enabled ? X86_PTE_PAE_PG_MASK : X86_PTE_PAE_PG_MASK & ~RT_BIT_64(20);
4516	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4517	{
4518	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4519	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4520	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4521	{
4522	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX32 hint=%RX32\n",
4523	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
4524	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & fPgMask, i);
4525	if (!pPage->cPresent)
4526	break;
4527	}
4528	}
4529	}
4530
4531
4532	/**
4533	* Clear references to guest physical memory in a 32-bit / 4MB page table.
4534	*
4535	* @param pPool The pool.
4536	* @param pPage The page.
4537	* @param pShwPT The shadow page table (mapping of the page).
4538	*/
4539	DECLINLINE(void) pgmPoolTrackDerefPT32Bit4MB(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT)
4540	{
4541	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4542	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4543	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4544	{
4545	Assert(!(pShwPT->a[i].u & RT_BIT_32(10)));
4546	if (pShwPT->a[i].n.u1Present)
4547	{
4548	Log4(("pgmPoolTrackDerefPT32Bit4MB: i=%d pte=%RX32 GCPhys=%RGp\n",
4549	i, pShwPT->a[i].u & X86_PTE_PG_MASK, GCPhys));
4550	pgmPoolTracDerefGCPhys(pPool, pPage, pShwPT->a[i].u & X86_PTE_PG_MASK, GCPhys & GCPhysA20Mask, i);
4551	if (!pPage->cPresent)
4552	break;
4553	}
4554	}
4555	}
4556
4557
4558	/**
4559	* Clear references to guest physical memory in a PAE / 2/4MB page table.
4560	*
4561	* @param pPool The pool.
4562	* @param pPage The page.
4563	* @param pShwPT The shadow page table (mapping of the page).
4564	*/
4565	DECLINLINE(void) pgmPoolTrackDerefPTPaeBig(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT)
4566	{
4567	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4568	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4569	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4570	{
4571	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4572	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4573	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4574	{
4575	Log4(("pgmPoolTrackDerefPTPaeBig: i=%d pte=%RX64 hint=%RGp\n",
4576	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), GCPhys));
4577	pgmPoolTracDerefGCPhys(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), GCPhys & GCPhysA20Mask, i);
4578	if (!pPage->cPresent)
4579	break;
4580	}
4581	}
4582	}
4583
4584
4585	/**
4586	* Clear references to shadowed pages in an EPT page table.
4587	*
4588	* @param pPool The pool.
4589	* @param pPage The page.
4590	* @param pShwPT The shadow page directory pointer table (mapping of the
4591	* page).
4592	*/
4593	DECLINLINE(void) pgmPoolTrackDerefPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPT pShwPT)
4594	{
4595	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4596	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4597	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4598	{
4599	Assert((pShwPT->a[i].u & UINT64_C(0xfff0000000000f80)) == 0);
4600	if (pShwPT->a[i].n.u1Present)
4601	{
4602	Log4(("pgmPoolTrackDerefPTEPT: i=%d pte=%RX64 GCPhys=%RX64\n",
4603	i, pShwPT->a[i].u & EPT_PTE_PG_MASK, pPage->GCPhys));
4604	pgmPoolTracDerefGCPhys(pPool, pPage, pShwPT->a[i].u & EPT_PTE_PG_MASK, GCPhys & GCPhysA20Mask, i);
4605	if (!pPage->cPresent)
4606	break;
4607	}
4608	}
4609	}
4610
4611
4612	/**
4613	* Clear references to shadowed pages in a 32 bits page directory.
4614	*
4615	* @param pPool The pool.
4616	* @param pPage The page.
4617	* @param pShwPD The shadow page directory (mapping of the page).
4618	*/
4619	DECLINLINE(void) pgmPoolTrackDerefPD(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PD pShwPD)
4620	{
4621	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4622	{
4623	if ( pShwPD->a[i].n.u1Present
4624	&& !(pShwPD->a[i].u & PGM_PDFLAGS_MAPPING)
4625	)
4626	{
4627	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & X86_PDE_PG_MASK);
4628	if (pSubPage)
4629	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4630	else
4631	AssertFatalMsgFailed(("%x\n", pShwPD->a[i].u & X86_PDE_PG_MASK));
4632	}
4633	}
4634	}
4635
4636
4637	/**
4638	* Clear references to shadowed pages in a PAE (legacy or 64 bits) page directory.
4639	*
4640	* @param pPool The pool.
4641	* @param pPage The page.
4642	* @param pShwPD The shadow page directory (mapping of the page).
4643	*/
4644	DECLINLINE(void) pgmPoolTrackDerefPDPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPAE pShwPD)
4645	{
4646	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4647	{
4648	if ( pShwPD->a[i].n.u1Present
4649	&& !(pShwPD->a[i].u & PGM_PDFLAGS_MAPPING))
4650	{
4651	#ifdef PGM_WITH_LARGE_PAGES
4652	if (pShwPD->a[i].b.u1Size)
4653	{
4654	Log4(("pgmPoolTrackDerefPDPae: i=%d pde=%RX64 GCPhys=%RX64\n",
4655	i, pShwPD->a[i].u & X86_PDE2M_PAE_PG_MASK, pPage->GCPhys));
4656	pgmPoolTracDerefGCPhys(pPool, pPage, pShwPD->a[i].u & X86_PDE2M_PAE_PG_MASK,
4657	pPage->GCPhys + i * 2 * _1M /* pPage->GCPhys = base address of the memory described by the PD */,
4658	i);
4659	}
4660	else
4661	#endif
4662	{
4663	Assert((pShwPD->a[i].u & (X86_PDE_PAE_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000000))) == 0);
4664	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & X86_PDE_PAE_PG_MASK);
4665	if (pSubPage)
4666	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4667	else
4668	AssertFatalMsgFailed(("%RX64\n", pShwPD->a[i].u & X86_PDE_PAE_PG_MASK));
4669	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4670	}
4671	}
4672	}
4673	}
4674
4675
4676	/**
4677	* Clear references to shadowed pages in a PAE page directory pointer table.
4678	*
4679	* @param pPool The pool.
4680	* @param pPage The page.
4681	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4682	*/
4683	DECLINLINE(void) pgmPoolTrackDerefPDPTPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
4684	{
4685	for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++)
4686	{
4687	Assert((pShwPDPT->a[i].u & (X86_PDPE_PAE_MBZ_MASK \| UINT64_C(0x7ff0000000000200))) == 0);
4688	if ( pShwPDPT->a[i].n.u1Present
4689	&& !(pShwPDPT->a[i].u & PGM_PLXFLAGS_MAPPING)
4690	)
4691	{
4692	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & X86_PDPE_PG_MASK);
4693	if (pSubPage)
4694	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4695	else
4696	AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & X86_PDPE_PG_MASK));
4697	}
4698	}
4699	}
4700
4701
4702	/**
4703	* Clear references to shadowed pages in a 64-bit page directory pointer table.
4704	*
4705	* @param pPool The pool.
4706	* @param pPage The page.
4707	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4708	*/
4709	DECLINLINE(void) pgmPoolTrackDerefPDPT64Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
4710	{
4711	for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
4712	{
4713	Assert((pShwPDPT->a[i].u & (X86_PDPE_LM_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000200))) == 0);
4714	if (pShwPDPT->a[i].n.u1Present)
4715	{
4716	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & X86_PDPE_PG_MASK);
4717	if (pSubPage)
4718	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4719	else
4720	AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & X86_PDPE_PG_MASK));
4721	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4722	}
4723	}
4724	}
4725
4726
4727	/**
4728	* Clear references to shadowed pages in a 64-bit level 4 page table.
4729	*
4730	* @param pPool The pool.
4731	* @param pPage The page.
4732	* @param pShwPML4 The shadow page directory pointer table (mapping of the page).
4733	*/
4734	DECLINLINE(void) pgmPoolTrackDerefPML464Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PML4 pShwPML4)
4735	{
4736	for (unsigned i = 0; i < RT_ELEMENTS(pShwPML4->a); i++)
4737	{
4738	Assert((pShwPML4->a[i].u & (X86_PML4E_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000200))) == 0);
4739	if (pShwPML4->a[i].n.u1Present)
4740	{
4741	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPML4->a[i].u & X86_PDPE_PG_MASK);
4742	if (pSubPage)
4743	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4744	else
4745	AssertFatalMsgFailed(("%RX64\n", pShwPML4->a[i].u & X86_PML4E_PG_MASK));
4746	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4747	}
4748	}
4749	}
4750
4751
4752	/**
4753	* Clear references to shadowed pages in an EPT page directory.
4754	*
4755	* @param pPool The pool.
4756	* @param pPage The page.
4757	* @param pShwPD The shadow page directory (mapping of the page).
4758	*/
4759	DECLINLINE(void) pgmPoolTrackDerefPDEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPD pShwPD)
4760	{
4761	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4762	{
4763	Assert((pShwPD->a[i].u & UINT64_C(0xfff0000000000f80)) == 0);
4764	if (pShwPD->a[i].n.u1Present)
4765	{
4766	#ifdef PGM_WITH_LARGE_PAGES
4767	if (pShwPD->a[i].b.u1Size)
4768	{
4769	Log4(("pgmPoolTrackDerefPDEPT: i=%d pde=%RX64 GCPhys=%RX64\n",
4770	i, pShwPD->a[i].u & X86_PDE2M_PAE_PG_MASK, pPage->GCPhys));
4771	pgmPoolTracDerefGCPhys(pPool, pPage, pShwPD->a[i].u & X86_PDE2M_PAE_PG_MASK,
4772	pPage->GCPhys + i * 2 * _1M /* pPage->GCPhys = base address of the memory described by the PD */,
4773	i);
4774	}
4775	else
4776	#endif
4777	{
4778	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & EPT_PDE_PG_MASK);
4779	if (pSubPage)
4780	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4781	else
4782	AssertFatalMsgFailed(("%RX64\n", pShwPD->a[i].u & EPT_PDE_PG_MASK));
4783	}
4784	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4785	}
4786	}
4787	}
4788
4789
4790	/**
4791	* Clear references to shadowed pages in an EPT page directory pointer table.
4792	*
4793	* @param pPool The pool.
4794	* @param pPage The page.
4795	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4796	*/
4797	DECLINLINE(void) pgmPoolTrackDerefPDPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPDPT pShwPDPT)
4798	{
4799	for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
4800	{
4801	Assert((pShwPDPT->a[i].u & UINT64_C(0xfff0000000000f80)) == 0);
4802	if (pShwPDPT->a[i].n.u1Present)
4803	{
4804	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPDPT->a[i].u & EPT_PDPTE_PG_MASK);
4805	if (pSubPage)
4806	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4807	else
4808	AssertFatalMsgFailed(("%RX64\n", pShwPDPT->a[i].u & EPT_PDPTE_PG_MASK));
4809	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4810	}
4811	}
4812	}
4813
4814
4815	/**
4816	* Clears all references made by this page.
4817	*
4818	* This includes other shadow pages and GC physical addresses.
4819	*
4820	* @param pPool The pool.
4821	* @param pPage The page.
4822	*/
4823	static void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
4824	{
4825	/*
4826	* Map the shadow page and take action according to the page kind.
4827	*/
4828	PVM pVM = pPool->CTX_SUFF(pVM);
4829	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
4830	switch (pPage->enmKind)
4831	{
4832	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
4833	{
4834	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
4835	void *pvGst;
4836	int rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
4837	pgmPoolTrackDerefPT32Bit32Bit(pPool, pPage, (PX86PT)pvShw, (PCX86PT)pvGst);
4838	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
4839	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
4840	break;
4841	}
4842
4843	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
4844	{
4845	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
4846	void *pvGst;
4847	int rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
4848	pgmPoolTrackDerefPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst);
4849	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
4850	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
4851	break;
4852	}
4853
4854	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
4855	{
4856	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
4857	void *pvGst;
4858	int rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
4859	pgmPoolTrackDerefPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
4860	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
4861	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
4862	break;
4863	}
4864
4865	case PGMPOOLKIND_32BIT_PT_FOR_PHYS: /* treat it like a 4 MB page */
4866	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
4867	{
4868	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
4869	pgmPoolTrackDerefPT32Bit4MB(pPool, pPage, (PX86PT)pvShw);
4870	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
4871	break;
4872	}
4873
4874	case PGMPOOLKIND_PAE_PT_FOR_PHYS: /* treat it like a 2 MB page */
4875	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
4876	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
4877	{
4878	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
4879	pgmPoolTrackDerefPTPaeBig(pPool, pPage, (PPGMSHWPTPAE)pvShw);
4880	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
4881	break;
4882	}
4883
4884	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
4885	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
4886	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
4887	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
4888	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
4889	case PGMPOOLKIND_PAE_PD_PHYS:
4890	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
4891	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
4892	pgmPoolTrackDerefPDPae(pPool, pPage, (PX86PDPAE)pvShw);
4893	break;
4894
4895	case PGMPOOLKIND_32BIT_PD_PHYS:
4896	case PGMPOOLKIND_32BIT_PD:
4897	pgmPoolTrackDerefPD(pPool, pPage, (PX86PD)pvShw);
4898	break;
4899
4900	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
4901	case PGMPOOLKIND_PAE_PDPT:
4902	case PGMPOOLKIND_PAE_PDPT_PHYS:
4903	pgmPoolTrackDerefPDPTPae(pPool, pPage, (PX86PDPT)pvShw);
4904	break;
4905
4906	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
4907	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
4908	pgmPoolTrackDerefPDPT64Bit(pPool, pPage, (PX86PDPT)pvShw);
4909	break;
4910
4911	case PGMPOOLKIND_64BIT_PML4:
4912	pgmPoolTrackDerefPML464Bit(pPool, pPage, (PX86PML4)pvShw);
4913	break;
4914
4915	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
4916	pgmPoolTrackDerefPTEPT(pPool, pPage, (PEPTPT)pvShw);
4917	break;
4918
4919	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
4920	pgmPoolTrackDerefPDEPT(pPool, pPage, (PEPTPD)pvShw);
4921	break;
4922
4923	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
4924	pgmPoolTrackDerefPDPTEPT(pPool, pPage, (PEPTPDPT)pvShw);
4925	break;
4926
4927	default:
4928	AssertFatalMsgFailed(("enmKind=%d\n", pPage->enmKind));
4929	}
4930
4931	/* paranoia, clear the shadow page. Remove this laser (i.e. let Alloc and ClearAll do it). */
4932	STAM_PROFILE_START(&pPool->StatZeroPage, z);
4933	ASMMemZeroPage(pvShw);
4934	STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
4935	pPage->fZeroed = true;
4936	Assert(!pPage->cPresent);
4937	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
4938	}
4939
4940
4941	/**
4942	* Flushes a pool page.
4943	*
4944	* This moves the page to the free list after removing all user references to it.
4945	*
4946	* @returns VBox status code.
4947	* @retval VINF_SUCCESS on success.
4948	* @param pPool The pool.
4949	* @param pPage The shadow page.
4950	* @param fFlush Flush the TLBS when required (should only be false in very specific use cases!!)
4951	*/
4952	int pgmPoolFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fFlush)
4953	{
4954	PVM pVM = pPool->CTX_SUFF(pVM);
4955	bool fFlushRequired = false;
4956
4957	int rc = VINF_SUCCESS;
4958	STAM_PROFILE_START(&pPool->StatFlushPage, f);
4959	LogFlow(("pgmPoolFlushPage: pPage=%p:{.Key=%RHp, .idx=%d, .enmKind=%s, .GCPhys=%RGp}\n",
4960	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
4961
4962	/*
4963	* Reject any attempts at flushing any of the special root pages (shall
4964	* not happen).
4965	*/
4966	AssertMsgReturn(pPage->idx >= PGMPOOL_IDX_FIRST,
4967	("pgmPoolFlushPage: special root page, rejected. enmKind=%s idx=%d\n",
4968	pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx),
4969	VINF_SUCCESS);
4970
4971	pgmLock(pVM);
4972
4973	/*
4974	* Quietly reject any attempts at flushing the currently active shadow CR3 mapping
4975	*/
4976	if (pgmPoolIsPageLocked(pPage))
4977	{
4978	AssertMsg( pPage->enmKind == PGMPOOLKIND_64BIT_PML4
4979	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PDPT
4980	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PDPT_FOR_32BIT
4981	\|\| pPage->enmKind == PGMPOOLKIND_32BIT_PD
4982	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD_FOR_PAE_PD
4983	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD
4984	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD
4985	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD
4986	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD
4987	\|\| pPage->enmKind == PGMPOOLKIND_ROOT_NESTED,
4988	("Can't free the shadow CR3! (%RHp vs %RHp kind=%d\n", PGMGetHyperCR3(VMMGetCpu(pVM)), pPage->Core.Key, pPage->enmKind));
4989	Log(("pgmPoolFlushPage: current active shadow CR3, rejected. enmKind=%s idx=%d\n", pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx));
4990	pgmUnlock(pVM);
4991	return VINF_SUCCESS;
4992	}
4993
4994	#if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
4995	/* Start a subset so we won't run out of mapping space. */
4996	PVMCPU pVCpu = VMMGetCpu(pVM);
4997	uint32_t iPrevSubset = PGMRZDynMapPushAutoSubset(pVCpu);
4998	#endif
4999
5000	/*
5001	* Mark the page as being in need of an ASMMemZeroPage().
5002	*/
5003	pPage->fZeroed = false;
5004
5005	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5006	if (pPage->fDirty)
5007	pgmPoolFlushDirtyPage(pVM, pPool, pPage->idxDirtyEntry, false /* do not remove */);
5008	#endif
5009
5010	/* If there are any users of this table, then we must issue a tlb flush on all VCPUs. */
5011	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
5012	fFlushRequired = true;
5013
5014	/*
5015	* Clear the page.
5016	*/
5017	pgmPoolTrackClearPageUsers(pPool, pPage);
5018	STAM_PROFILE_START(&pPool->StatTrackDeref,a);
5019	pgmPoolTrackDeref(pPool, pPage);
5020	STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
5021
5022	/*
5023	* Flush it from the cache.
5024	*/
5025	pgmPoolCacheFlushPage(pPool, pPage);
5026
5027	#if defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) \|\| defined(IN_RC)
5028	/* Heavy stuff done. */
5029	PGMRZDynMapPopAutoSubset(pVCpu, iPrevSubset);
5030	#endif
5031
5032	/*
5033	* Deregistering the monitoring.
5034	*/
5035	if (pPage->fMonitored)
5036	rc = pgmPoolMonitorFlush(pPool, pPage);
5037
5038	/*
5039	* Free the page.
5040	*/
5041	Assert(pPage->iNext == NIL_PGMPOOL_IDX);
5042	pPage->iNext = pPool->iFreeHead;
5043	pPool->iFreeHead = pPage->idx;
5044	pPage->enmKind = PGMPOOLKIND_FREE;
5045	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5046	pPage->GCPhys = NIL_RTGCPHYS;
5047	pPage->fReusedFlushPending = false;
5048
5049	pPool->cUsedPages--;
5050
5051	/* Flush the TLBs of all VCPUs if required. */
5052	if ( fFlushRequired
5053	&& fFlush)
5054	{
5055	PGM_INVL_ALL_VCPU_TLBS(pVM);
5056	}
5057
5058	pgmUnlock(pVM);
5059	STAM_PROFILE_STOP(&pPool->StatFlushPage, f);
5060	return rc;
5061	}
5062
5063
5064	/**
5065	* Frees a usage of a pool page.
5066	*
5067	* The caller is responsible to updating the user table so that it no longer
5068	* references the shadow page.
5069	*
5070	* @param pPool The pool.
5071	* @param pPage The shadow page.
5072	* @param iUser The shadow page pool index of the user table.
5073	* NIL_PGMPOOL_IDX for root pages.
5074	* @param iUserTable The index into the user table (shadowed). Ignored if
5075	* root page.
5076	*/
5077	void pgmPoolFreeByPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
5078	{
5079	PVM pVM = pPool->CTX_SUFF(pVM);
5080
5081	STAM_PROFILE_START(&pPool->StatFree, a);
5082	LogFlow(("pgmPoolFreeByPage: pPage=%p:{.Key=%RHp, .idx=%d, enmKind=%s} iUser=%d iUserTable=%#x\n",
5083	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), iUser, iUserTable));
5084	AssertReturnVoid(pPage->idx >= PGMPOOL_IDX_FIRST); /* paranoia (#6349) */
5085
5086	pgmLock(pVM);
5087	if (iUser != NIL_PGMPOOL_IDX)
5088	pgmPoolTrackFreeUser(pPool, pPage, iUser, iUserTable);
5089	if (!pPage->fCached)
5090	pgmPoolFlushPage(pPool, pPage);
5091	pgmUnlock(pVM);
5092	STAM_PROFILE_STOP(&pPool->StatFree, a);
5093	}
5094
5095
5096	/**
5097	* Makes one or more free page free.
5098	*
5099	* @returns VBox status code.
5100	* @retval VINF_SUCCESS on success.
5101	* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
5102	*
5103	* @param pPool The pool.
5104	* @param enmKind Page table kind
5105	* @param iUser The user of the page.
5106	*/
5107	static int pgmPoolMakeMoreFreePages(PPGMPOOL pPool, PGMPOOLKIND enmKind, uint16_t iUser)
5108	{
5109	PVM pVM = pPool->CTX_SUFF(pVM);
5110	LogFlow(("pgmPoolMakeMoreFreePages: enmKind=%d iUser=%d\n", enmKind, iUser));
5111	NOREF(enmKind);
5112
5113	/*
5114	* If the pool isn't full grown yet, expand it.
5115	*/
5116	if ( pPool->cCurPages < pPool->cMaxPages
5117	#if defined(IN_RC)
5118	/* Hack alert: we can't deal with jumps to ring 3 when called from MapCR3 and allocating pages for PAE PDs. */
5119	&& enmKind != PGMPOOLKIND_PAE_PD_FOR_PAE_PD
5120	&& (enmKind < PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD \|\| enmKind > PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD)
5121	#endif
5122	)
5123	{
5124	STAM_PROFILE_ADV_SUSPEND(&pPool->StatAlloc, a);
5125	#ifdef IN_RING3
5126	int rc = PGMR3PoolGrow(pVM);
5127	#else
5128	int rc = VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_PGM_POOL_GROW, 0);
5129	#endif
5130	if (RT_FAILURE(rc))
5131	return rc;
5132	STAM_PROFILE_ADV_RESUME(&pPool->StatAlloc, a);
5133	if (pPool->iFreeHead != NIL_PGMPOOL_IDX)
5134	return VINF_SUCCESS;
5135	}
5136
5137	/*
5138	* Free one cached page.
5139	*/
5140	return pgmPoolCacheFreeOne(pPool, iUser);
5141	}
5142
5143
5144	/**
5145	* Allocates a page from the pool.
5146	*
5147	* This page may actually be a cached page and not in need of any processing
5148	* on the callers part.
5149	*
5150	* @returns VBox status code.
5151	* @retval VINF_SUCCESS if a NEW page was allocated.
5152	* @retval VINF_PGM_CACHED_PAGE if a CACHED page was returned.
5153	* @retval VERR_PGM_POOL_FLUSHED if the pool was flushed.
5154	*
5155	* @param pVM The cross context VM structure.
5156	* @param GCPhys The GC physical address of the page we're gonna shadow.
5157	* For 4MB and 2MB PD entries, it's the first address the
5158	* shadow PT is covering.
5159	* @param enmKind The kind of mapping.
5160	* @param enmAccess Access type for the mapping (only relevant for big pages)
5161	* @param fA20Enabled Whether the A20 gate is enabled or not.
5162	* @param iUser The shadow page pool index of the user table. Root
5163	* pages should pass NIL_PGMPOOL_IDX.
5164	* @param iUserTable The index into the user table (shadowed). Ignored for
5165	* root pages (iUser == NIL_PGMPOOL_IDX).
5166	* @param fLockPage Lock the page
5167	* @param ppPage Where to store the pointer to the page. NULL is stored here on failure.
5168	*/
5169	int pgmPoolAlloc(PVM pVM, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, bool fA20Enabled,
5170	uint16_t iUser, uint32_t iUserTable, bool fLockPage, PPPGMPOOLPAGE ppPage)
5171	{
5172	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5173	STAM_PROFILE_ADV_START(&pPool->StatAlloc, a);
5174	LogFlow(("pgmPoolAlloc: GCPhys=%RGp enmKind=%s iUser=%d iUserTable=%#x\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable));
5175	*ppPage = NULL;
5176	/** @todo CSAM/PGMPrefetchPage messes up here during CSAMR3CheckGates
5177	* (TRPMR3SyncIDT) because of FF priority. Try fix that?
5178	* Assert(!(pVM->pgm.s.fGlobalSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)); */
5179
5180	pgmLock(pVM);
5181
5182	if (pPool->fCacheEnabled)
5183	{
5184	int rc2 = pgmPoolCacheAlloc(pPool, GCPhys, enmKind, enmAccess, fA20Enabled, iUser, iUserTable, ppPage);
5185	if (RT_SUCCESS(rc2))
5186	{
5187	if (fLockPage)
5188	pgmPoolLockPage(pPool, *ppPage);
5189	pgmUnlock(pVM);
5190	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5191	LogFlow(("pgmPoolAlloc: cached returns %Rrc ppPage=%p:{.Key=%RHp, .idx=%d}\n", rc2, ppPage, (ppPage)->Core.Key, (ppPage)->idx));
5192	return rc2;
5193	}
5194	}
5195
5196	/*
5197	* Allocate a new one.
5198	*/
5199	int rc = VINF_SUCCESS;
5200	uint16_t iNew = pPool->iFreeHead;
5201	if (iNew == NIL_PGMPOOL_IDX)
5202	{
5203	rc = pgmPoolMakeMoreFreePages(pPool, enmKind, iUser);
5204	if (RT_FAILURE(rc))
5205	{
5206	pgmUnlock(pVM);
5207	Log(("pgmPoolAlloc: returns %Rrc (Free)\n", rc));
5208	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5209	return rc;
5210	}
5211	iNew = pPool->iFreeHead;
5212	AssertReleaseReturn(iNew != NIL_PGMPOOL_IDX, VERR_PGM_POOL_IPE);
5213	}
5214
5215	/* unlink the free head */
5216	PPGMPOOLPAGE pPage = &pPool->aPages[iNew];
5217	pPool->iFreeHead = pPage->iNext;
5218	pPage->iNext = NIL_PGMPOOL_IDX;
5219
5220	/*
5221	* Initialize it.
5222	*/
5223	pPool->cUsedPages++; /* physical handler registration / pgmPoolTrackFlushGCPhysPTsSlow requirement. */
5224	pPage->enmKind = enmKind;
5225	pPage->enmAccess = enmAccess;
5226	pPage->GCPhys = GCPhys;
5227	pPage->fA20Enabled = fA20Enabled;
5228	pPage->fSeenNonGlobal = false; /* Set this to 'true' to disable this feature. */
5229	pPage->fMonitored = false;
5230	pPage->fCached = false;
5231	pPage->fDirty = false;
5232	pPage->fReusedFlushPending = false;
5233	pPage->cModifications = 0;
5234	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
5235	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
5236	pPage->cPresent = 0;
5237	pPage->iFirstPresent = NIL_PGMPOOL_PRESENT_INDEX;
5238	pPage->idxDirtyEntry = 0;
5239	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
5240	pPage->GCPtrLastAccessHandlerRip = NIL_RTGCPTR;
5241	pPage->cLastAccessHandler = 0;
5242	pPage->cLocked = 0;
5243	# ifdef VBOX_STRICT
5244	pPage->GCPtrDirtyFault = NIL_RTGCPTR;
5245	# endif
5246
5247	/*
5248	* Insert into the tracking and cache. If this fails, free the page.
5249	*/
5250	int rc3 = pgmPoolTrackInsert(pPool, pPage, GCPhys, iUser, iUserTable);
5251	if (RT_FAILURE(rc3))
5252	{
5253	pPool->cUsedPages--;
5254	pPage->enmKind = PGMPOOLKIND_FREE;
5255	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5256	pPage->GCPhys = NIL_RTGCPHYS;
5257	pPage->iNext = pPool->iFreeHead;
5258	pPool->iFreeHead = pPage->idx;
5259	pgmUnlock(pVM);
5260	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5261	Log(("pgmPoolAlloc: returns %Rrc (Insert)\n", rc3));
5262	return rc3;
5263	}
5264
5265	/*
5266	* Commit the allocation, clear the page and return.
5267	*/
5268	#ifdef VBOX_WITH_STATISTICS
5269	if (pPool->cUsedPages > pPool->cUsedPagesHigh)
5270	pPool->cUsedPagesHigh = pPool->cUsedPages;
5271	#endif
5272
5273	if (!pPage->fZeroed)
5274	{
5275	STAM_PROFILE_START(&pPool->StatZeroPage, z);
5276	void *pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
5277	ASMMemZeroPage(pv);
5278	STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
5279	}
5280
5281	*ppPage = pPage;
5282	if (fLockPage)
5283	pgmPoolLockPage(pPool, pPage);
5284	pgmUnlock(pVM);
5285	LogFlow(("pgmPoolAlloc: returns %Rrc *ppPage=%p:{.Key=%RHp, .idx=%d, .fCached=%RTbool, .fMonitored=%RTbool}\n",
5286	rc, pPage, pPage->Core.Key, pPage->idx, pPage->fCached, pPage->fMonitored));
5287	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5288	return rc;
5289	}
5290
5291
5292	/**
5293	* Frees a usage of a pool page.
5294	*
5295	* @param pVM The cross context VM structure.
5296	* @param HCPhys The HC physical address of the shadow page.
5297	* @param iUser The shadow page pool index of the user table.
5298	* NIL_PGMPOOL_IDX if root page.
5299	* @param iUserTable The index into the user table (shadowed). Ignored if
5300	* root page.
5301	*/
5302	void pgmPoolFree(PVM pVM, RTHCPHYS HCPhys, uint16_t iUser, uint32_t iUserTable)
5303	{
5304	LogFlow(("pgmPoolFree: HCPhys=%RHp iUser=%d iUserTable=%#x\n", HCPhys, iUser, iUserTable));
5305	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5306	pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, HCPhys), iUser, iUserTable);
5307	}
5308
5309
5310	/**
5311	* Internal worker for finding a 'in-use' shadow page give by it's physical address.
5312	*
5313	* @returns Pointer to the shadow page structure.
5314	* @param pPool The pool.
5315	* @param HCPhys The HC physical address of the shadow page.
5316	*/
5317	PPGMPOOLPAGE pgmPoolGetPage(PPGMPOOL pPool, RTHCPHYS HCPhys)
5318	{
5319	PGM_LOCK_ASSERT_OWNER(pPool->CTX_SUFF(pVM));
5320
5321	/*
5322	* Look up the page.
5323	*/
5324	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
5325
5326	AssertFatalMsg(pPage && pPage->enmKind != PGMPOOLKIND_FREE, ("HCPhys=%RHp pPage=%p idx=%d\n", HCPhys, pPage, (pPage) ? pPage->idx : 0));
5327	return pPage;
5328	}
5329
5330
5331	/**
5332	* Internal worker for finding a page for debugging purposes, no assertions.
5333	*
5334	* @returns Pointer to the shadow page structure. NULL on if not found.
5335	* @param pPool The pool.
5336	* @param HCPhys The HC physical address of the shadow page.
5337	*/
5338	PPGMPOOLPAGE pgmPoolQueryPageForDbg(PPGMPOOL pPool, RTHCPHYS HCPhys)
5339	{
5340	PGM_LOCK_ASSERT_OWNER(pPool->CTX_SUFF(pVM));
5341	return (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
5342	}
5343
5344	#ifdef IN_RING3 /* currently only used in ring 3; save some space in the R0 & GC modules (left it here as we might need it elsewhere later on) */
5345
5346	/**
5347	* Flush the specified page if present
5348	*
5349	* @param pVM The cross context VM structure.
5350	* @param GCPhys Guest physical address of the page to flush
5351	*/
5352	void pgmPoolFlushPageByGCPhys(PVM pVM, RTGCPHYS GCPhys)
5353	{
5354	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5355
5356	VM_ASSERT_EMT(pVM);
5357
5358	/*
5359	* Look up the GCPhys in the hash.
5360	*/
5361	GCPhys = GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
5362	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
5363	if (i == NIL_PGMPOOL_IDX)
5364	return;
5365
5366	do
5367	{
5368	PPGMPOOLPAGE pPage = &pPool->aPages[i];
5369	if (pPage->GCPhys - GCPhys < PAGE_SIZE)
5370	{
5371	switch (pPage->enmKind)
5372	{
5373	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
5374	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
5375	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
5376	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
5377	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
5378	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
5379	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
5380	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
5381	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
5382	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
5383	case PGMPOOLKIND_64BIT_PML4:
5384	case PGMPOOLKIND_32BIT_PD:
5385	case PGMPOOLKIND_PAE_PDPT:
5386	{
5387	Log(("PGMPoolFlushPage: found pgm pool pages for %RGp\n", GCPhys));
5388	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5389	if (pPage->fDirty)
5390	STAM_COUNTER_INC(&pPool->StatForceFlushDirtyPage);
5391	else
5392	#endif
5393	STAM_COUNTER_INC(&pPool->StatForceFlushPage);
5394	Assert(!pgmPoolIsPageLocked(pPage));
5395	pgmPoolMonitorChainFlush(pPool, pPage);
5396	return;
5397	}
5398
5399	/* ignore, no monitoring. */
5400	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
5401	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
5402	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
5403	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
5404	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
5405	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
5406	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
5407	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
5408	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
5409	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
5410	case PGMPOOLKIND_ROOT_NESTED:
5411	case PGMPOOLKIND_PAE_PD_PHYS:
5412	case PGMPOOLKIND_PAE_PDPT_PHYS:
5413	case PGMPOOLKIND_32BIT_PD_PHYS:
5414	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
5415	break;
5416
5417	default:
5418	AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
5419	}
5420	}
5421
5422	/* next */
5423	i = pPage->iNext;
5424	} while (i != NIL_PGMPOOL_IDX);
5425	return;
5426	}
5427
5428	#endif /* IN_RING3 */
5429	#ifdef IN_RING3
5430
5431	/**
5432	* Reset CPU on hot plugging.
5433	*
5434	* @param pVM The cross context VM structure.
5435	* @param pVCpu The cross context virtual CPU structure.
5436	*/
5437	void pgmR3PoolResetUnpluggedCpu(PVM pVM, PVMCPU pVCpu)
5438	{
5439	pgmR3ExitShadowModeBeforePoolFlush(pVCpu);
5440
5441	pgmR3ReEnterShadowModeAfterPoolFlush(pVM, pVCpu);
5442	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
5443	VMCPU_FF_SET(pVCpu, VMCPU_FF_TLB_FLUSH);
5444	}
5445
5446
5447	/**
5448	* Flushes the entire cache.
5449	*
5450	* It will assert a global CR3 flush (FF) and assumes the caller is aware of
5451	* this and execute this CR3 flush.
5452	*
5453	* @param pVM The cross context VM structure.
5454	*/
5455	void pgmR3PoolReset(PVM pVM)
5456	{
5457	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5458
5459	PGM_LOCK_ASSERT_OWNER(pVM);
5460	STAM_PROFILE_START(&pPool->StatR3Reset, a);
5461	LogFlow(("pgmR3PoolReset:\n"));
5462
5463	/*
5464	* If there are no pages in the pool, there is nothing to do.
5465	*/
5466	if (pPool->cCurPages <= PGMPOOL_IDX_FIRST)
5467	{
5468	STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
5469	return;
5470	}
5471
5472	/*
5473	* Exit the shadow mode since we're going to clear everything,
5474	* including the root page.
5475	*/
5476	for (VMCPUID i = 0; i < pVM->cCpus; i++)
5477	pgmR3ExitShadowModeBeforePoolFlush(&pVM->aCpus[i]);
5478
5479	/*
5480	* Nuke the free list and reinsert all pages into it.
5481	*/
5482	for (unsigned i = pPool->cCurPages - 1; i >= PGMPOOL_IDX_FIRST; i--)
5483	{
5484	PPGMPOOLPAGE pPage = &pPool->aPages[i];
5485
5486	Assert(pPage->Core.Key == MMPage2Phys(pVM, pPage->pvPageR3));
5487	if (pPage->fMonitored)
5488	pgmPoolMonitorFlush(pPool, pPage);
5489	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
5490	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
5491	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
5492	pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
5493	pPage->GCPhys = NIL_RTGCPHYS;
5494	pPage->enmKind = PGMPOOLKIND_FREE;
5495	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5496	Assert(pPage->idx == i);
5497	pPage->iNext = i + 1;
5498	pPage->fA20Enabled = true;
5499	pPage->fZeroed = false; /* This could probably be optimized, but better safe than sorry. */
5500	pPage->fSeenNonGlobal = false;
5501	pPage->fMonitored = false;
5502	pPage->fDirty = false;
5503	pPage->fCached = false;
5504	pPage->fReusedFlushPending = false;
5505	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
5506	pPage->cPresent = 0;
5507	pPage->iFirstPresent = NIL_PGMPOOL_PRESENT_INDEX;
5508	pPage->cModifications = 0;
5509	pPage->iAgeNext = NIL_PGMPOOL_IDX;
5510	pPage->iAgePrev = NIL_PGMPOOL_IDX;
5511	pPage->idxDirtyEntry = 0;
5512	pPage->GCPtrLastAccessHandlerRip = NIL_RTGCPTR;
5513	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
5514	pPage->cLastAccessHandler = 0;
5515	pPage->cLocked = 0;
5516	#ifdef VBOX_STRICT
5517	pPage->GCPtrDirtyFault = NIL_RTGCPTR;
5518	#endif
5519	}
5520	pPool->aPages[pPool->cCurPages - 1].iNext = NIL_PGMPOOL_IDX;
5521	pPool->iFreeHead = PGMPOOL_IDX_FIRST;
5522	pPool->cUsedPages = 0;
5523
5524	/*
5525	* Zap and reinitialize the user records.
5526	*/
5527	pPool->cPresent = 0;
5528	pPool->iUserFreeHead = 0;
5529	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
5530	const unsigned cMaxUsers = pPool->cMaxUsers;
5531	for (unsigned i = 0; i < cMaxUsers; i++)
5532	{
5533	paUsers[i].iNext = i + 1;
5534	paUsers[i].iUser = NIL_PGMPOOL_IDX;
5535	paUsers[i].iUserTable = 0xfffffffe;
5536	}
5537	paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
5538
5539	/*
5540	* Clear all the GCPhys links and rebuild the phys ext free list.
5541	*/
5542	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRangesX);
5543	pRam;
5544	pRam = pRam->CTX_SUFF(pNext))
5545	{
5546	unsigned iPage = pRam->cb >> PAGE_SHIFT;
5547	while (iPage-- > 0)
5548	PGM_PAGE_SET_TRACKING(pVM, &pRam->aPages[iPage], 0);
5549	}
5550
5551	pPool->iPhysExtFreeHead = 0;
5552	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
5553	const unsigned cMaxPhysExts = pPool->cMaxPhysExts;
5554	for (unsigned i = 0; i < cMaxPhysExts; i++)
5555	{
5556	paPhysExts[i].iNext = i + 1;
5557	paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
5558	paPhysExts[i].apte[0] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5559	paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
5560	paPhysExts[i].apte[1] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5561	paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
5562	paPhysExts[i].apte[2] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5563	}
5564	paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
5565
5566	/*
5567	* Just zap the modified list.
5568	*/
5569	pPool->cModifiedPages = 0;
5570	pPool->iModifiedHead = NIL_PGMPOOL_IDX;
5571
5572	/*
5573	* Clear the GCPhys hash and the age list.
5574	*/
5575	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aiHash); i++)
5576	pPool->aiHash[i] = NIL_PGMPOOL_IDX;
5577	pPool->iAgeHead = NIL_PGMPOOL_IDX;
5578	pPool->iAgeTail = NIL_PGMPOOL_IDX;
5579
5580	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5581	/* Clear all dirty pages. */
5582	pPool->idxFreeDirtyPage = 0;
5583	pPool->cDirtyPages = 0;
5584	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
5585	pPool->aDirtyPages[i].uIdx = NIL_PGMPOOL_IDX;
5586	#endif
5587
5588	/*
5589	* Reinsert active pages into the hash and ensure monitoring chains are correct.
5590	*/
5591	for (VMCPUID i = 0; i < pVM->cCpus; i++)
5592	{
5593	/*
5594	* Re-enter the shadowing mode and assert Sync CR3 FF.
5595	*/
5596	PVMCPU pVCpu = &pVM->aCpus[i];
5597	pgmR3ReEnterShadowModeAfterPoolFlush(pVM, pVCpu);
5598	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
5599	VMCPU_FF_SET(pVCpu, VMCPU_FF_TLB_FLUSH);
5600	}
5601
5602	STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
5603	}
5604
5605	#endif /* IN_RING3 */
5606
5607	#if defined(LOG_ENABLED) \|\| defined(VBOX_STRICT)
5608	/**
5609	* Stringifies a PGMPOOLKIND value.
5610	*/
5611	static const char *pgmPoolPoolKindToStr(uint8_t enmKind)
5612	{
5613	switch ((PGMPOOLKIND)enmKind)
5614	{
5615	case PGMPOOLKIND_INVALID:
5616	return "PGMPOOLKIND_INVALID";
5617	case PGMPOOLKIND_FREE:
5618	return "PGMPOOLKIND_FREE";
5619	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
5620	return "PGMPOOLKIND_32BIT_PT_FOR_PHYS";
5621	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
5622	return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT";
5623	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
5624	return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB";
5625	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
5626	return "PGMPOOLKIND_PAE_PT_FOR_PHYS";
5627	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
5628	return "PGMPOOLKIND_PAE_PT_FOR_32BIT_PT";
5629	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
5630	return "PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB";
5631	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
5632	return "PGMPOOLKIND_PAE_PT_FOR_PAE_PT";
5633	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
5634	return "PGMPOOLKIND_PAE_PT_FOR_PAE_2MB";
5635	case PGMPOOLKIND_32BIT_PD:
5636	return "PGMPOOLKIND_32BIT_PD";
5637	case PGMPOOLKIND_32BIT_PD_PHYS:
5638	return "PGMPOOLKIND_32BIT_PD_PHYS";
5639	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
5640	return "PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD";
5641	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
5642	return "PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD";
5643	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
5644	return "PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD";
5645	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
5646	return "PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD";
5647	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
5648	return "PGMPOOLKIND_PAE_PD_FOR_PAE_PD";
5649	case PGMPOOLKIND_PAE_PD_PHYS:
5650	return "PGMPOOLKIND_PAE_PD_PHYS";
5651	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
5652	return "PGMPOOLKIND_PAE_PDPT_FOR_32BIT";
5653	case PGMPOOLKIND_PAE_PDPT:
5654	return "PGMPOOLKIND_PAE_PDPT";
5655	case PGMPOOLKIND_PAE_PDPT_PHYS:
5656	return "PGMPOOLKIND_PAE_PDPT_PHYS";
5657	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
5658	return "PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT";
5659	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
5660	return "PGMPOOLKIND_64BIT_PDPT_FOR_PHYS";
5661	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
5662	return "PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD";
5663	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
5664	return "PGMPOOLKIND_64BIT_PD_FOR_PHYS";
5665	case PGMPOOLKIND_64BIT_PML4:
5666	return "PGMPOOLKIND_64BIT_PML4";
5667	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
5668	return "PGMPOOLKIND_EPT_PDPT_FOR_PHYS";
5669	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
5670	return "PGMPOOLKIND_EPT_PD_FOR_PHYS";
5671	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
5672	return "PGMPOOLKIND_EPT_PT_FOR_PHYS";
5673	case PGMPOOLKIND_ROOT_NESTED:
5674	return "PGMPOOLKIND_ROOT_NESTED";
5675	}
5676	return "Unknown kind!";
5677	}
5678	#endif /* LOG_ENABLED \|\| VBOX_STRICT */
5679

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp@ 69120

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