PGMAllPool.cpp@ 101505

Last change on this file since 101505 was 100964, checked in by vboxsync, 16 months ago
VMM/PGM: Some experiments wrt preseving ZERO page status as the (windows) guest zero's all memory prior to use. bugref:6385 bugref:10509
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1	/* $Id: PGMAllPool.cpp 100964 2023-08-24 14:45:42Z vboxsync $ */
2	/** @file
3	* PGM Shadow Page Pool.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_PGM_POOL
33	#define VBOX_WITHOUT_PAGING_BIT_FIELDS /* 64-bit bitfields are just asking for trouble. See @bugref{9841} and others. */
34	#include <VBox/vmm/pgm.h>
35	#include <VBox/vmm/mm.h>
36	#include <VBox/vmm/em.h>
37	#include <VBox/vmm/cpum.h>
38	#include "PGMInternal.h"
39	#include <VBox/vmm/vmcc.h>
40	#include "PGMInline.h"
41	#include <VBox/vmm/hm_vmx.h>
42
43	#include <VBox/log.h>
44	#include <VBox/err.h>
45	#include <iprt/asm.h>
46	#include <iprt/string.h>
47
48
49	/*********************************************************************************************************************************
50	* Internal Functions *
51	*********************************************************************************************************************************/
52	RT_C_DECLS_BEGIN
53	#if 0 /* unused */
54	DECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind);
55	DECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind);
56	#endif /* unused */
57	static void pgmPoolTrackClearPageUsers(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
58	static void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
59	static int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable);
60	static void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage);
61	#if defined(LOG_ENABLED) \|\| defined(VBOX_STRICT)
62	static const char *pgmPoolPoolKindToStr(uint8_t enmKind);
63	#endif
64	#if 0 /defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT)/
65	static void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT);
66	#endif
67
68	int pgmPoolTrackFlushGCPhysPTsSlow(PVMCC pVM, PPGMPAGE pPhysPage);
69	PPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVMCC pVM, uint16_t *piPhysExt);
70	void pgmPoolTrackPhysExtFree(PVMCC pVM, uint16_t iPhysExt);
71	void pgmPoolTrackPhysExtFreeList(PVMCC pVM, uint16_t iPhysExt);
72
73	RT_C_DECLS_END
74
75
76	#if 0 /* unused */
77	/**
78	* Checks if the specified page pool kind is for a 4MB or 2MB guest page.
79	*
80	* @returns true if it's the shadow of a 4MB or 2MB guest page, otherwise false.
81	* @param enmKind The page kind.
82	*/
83	DECLINLINE(bool) pgmPoolIsBigPage(PGMPOOLKIND enmKind)
84	{
85	switch (enmKind)
86	{
87	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
88	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
89	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
90	return true;
91	default:
92	return false;
93	}
94	}
95	#endif /* unused */
96
97
98	/**
99	* Flushes a chain of pages sharing the same access monitor.
100	*
101	* @param pPool The pool.
102	* @param pPage A page in the chain.
103	*/
104	void pgmPoolMonitorChainFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
105	{
106	LogFlow(("pgmPoolMonitorChainFlush: Flush page %RGp type=%d\n", pPage->GCPhys, pPage->enmKind));
107
108	/*
109	* Find the list head.
110	*/
111	uint16_t idx = pPage->idx;
112	if (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
113	{
114	while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
115	{
116	idx = pPage->iMonitoredPrev;
117	Assert(idx != pPage->idx);
118	pPage = &pPool->aPages[idx];
119	}
120	}
121
122	/*
123	* Iterate the list flushing each shadow page.
124	*/
125	for (;;)
126	{
127	idx = pPage->iMonitoredNext;
128	Assert(idx != pPage->idx);
129	if (pPage->idx >= PGMPOOL_IDX_FIRST)
130	{
131	int rc2 = pgmPoolFlushPage(pPool, pPage);
132	AssertRC(rc2);
133	}
134	/* next */
135	if (idx == NIL_PGMPOOL_IDX)
136	break;
137	pPage = &pPool->aPages[idx];
138	}
139	}
140
141
142	/**
143	* Wrapper for getting the current context pointer to the entry being modified.
144	*
145	* @returns VBox status code suitable for scheduling.
146	* @param pVM The cross context VM structure.
147	* @param pvDst Destination address
148	* @param pvSrc Pointer to the mapping of @a GCPhysSrc or NULL depending
149	* on the context (e.g. \#PF in R0 & RC).
150	* @param GCPhysSrc The source guest physical address.
151	* @param cb Size of data to read
152	*/
153	DECLINLINE(int) pgmPoolPhysSimpleReadGCPhys(PVMCC pVM, void pvDst, void const pvSrc, RTGCPHYS GCPhysSrc, size_t cb)
154	{
155	#if defined(IN_RING3)
156	NOREF(pVM); NOREF(GCPhysSrc);
157	memcpy(pvDst, (RTHCPTR)((uintptr_t)pvSrc & ~(RTHCUINTPTR)(cb - 1)), cb);
158	return VINF_SUCCESS;
159	#else
160	/** @todo in RC we could attempt to use the virtual address, although this can cause many faults (PAE Windows XP guest). */
161	NOREF(pvSrc);
162	return PGMPhysSimpleReadGCPhys(pVM, pvDst, GCPhysSrc & ~(RTGCPHYS)(cb - 1), cb);
163	#endif
164	}
165
166
167	/**
168	* Process shadow entries before they are changed by the guest.
169	*
170	* For PT entries we will clear them. For PD entries, we'll simply check
171	* for mapping conflicts and set the SyncCR3 FF if found.
172	*
173	* @param pVCpu The cross context virtual CPU structure.
174	* @param pPool The pool.
175	* @param pPage The head page.
176	* @param GCPhysFault The guest physical fault address.
177	* @param pvAddress Pointer to the mapping of @a GCPhysFault or NULL
178	* depending on the context (e.g. \#PF in R0 & RC).
179	* @param cbWrite Write size; might be zero if the caller knows we're not crossing entry boundaries
180	*/
181	static void pgmPoolMonitorChainChanging(PVMCPU pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhysFault,
182	void const *pvAddress, unsigned cbWrite)
183	{
184	AssertMsg(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX, ("%u (idx=%u)\n", pPage->iMonitoredPrev, pPage->idx));
185	const unsigned off = GCPhysFault & GUEST_PAGE_OFFSET_MASK;
186	PVMCC pVM = pPool->CTX_SUFF(pVM);
187	NOREF(pVCpu);
188
189	LogFlow(("pgmPoolMonitorChainChanging: %RGv phys=%RGp cbWrite=%d\n",
190	(RTGCPTR)(CTXTYPE(RTGCPTR, uintptr_t, RTGCPTR))(uintptr_t)pvAddress, GCPhysFault, cbWrite));
191
192	if (PGMPOOL_PAGE_IS_NESTED(pPage))
193	Log7Func(("%RGv phys=%RGp cbWrite=%d\n", (RTGCPTR)(CTXTYPE(RTGCPTR, uintptr_t, RTGCPTR))(uintptr_t)pvAddress, GCPhysFault, cbWrite));
194
195	for (;;)
196	{
197	union
198	{
199	void *pv;
200	PX86PT pPT;
201	PPGMSHWPTPAE pPTPae;
202	PX86PD pPD;
203	PX86PDPAE pPDPae;
204	PX86PDPT pPDPT;
205	PX86PML4 pPML4;
206	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
207	PEPTPDPT pEptPdpt;
208	PEPTPD pEptPd;
209	PEPTPT pEptPt;
210	#endif
211	} uShw;
212
213	LogFlow(("pgmPoolMonitorChainChanging: page idx=%d phys=%RGp (next=%d) kind=%s write=%#x\n",
214	pPage->idx, pPage->GCPhys, pPage->iMonitoredNext, pgmPoolPoolKindToStr(pPage->enmKind), cbWrite));
215
216	uShw.pv = NULL;
217	switch (pPage->enmKind)
218	{
219	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
220	{
221	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
222	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
223	const unsigned iShw = off / sizeof(X86PTE);
224	LogFlow(("PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT iShw=%x\n", iShw));
225	X86PGUINT const uPde = uShw.pPT->a[iShw].u;
226	if (uPde & X86_PTE_P)
227	{
228	X86PTE GstPte;
229	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
230	AssertRC(rc);
231	Log4(("pgmPoolMonitorChainChanging 32_32: deref %016RX64 GCPhys %08RX32\n", uPde & X86_PTE_PG_MASK, GstPte.u & X86_PTE_PG_MASK));
232	pgmPoolTracDerefGCPhysHint(pPool, pPage, uPde & X86_PTE_PG_MASK, GstPte.u & X86_PTE_PG_MASK, iShw);
233	ASMAtomicWriteU32(&uShw.pPT->a[iShw].u, 0);
234	}
235	break;
236	}
237
238	/* page/2 sized */
239	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
240	{
241	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
242	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
243	if (!((off ^ pPage->GCPhys) & (PAGE_SIZE / 2)))
244	{
245	const unsigned iShw = (off / sizeof(X86PTE)) & (X86_PG_PAE_ENTRIES - 1);
246	LogFlow(("PGMPOOLKIND_PAE_PT_FOR_32BIT_PT iShw=%x\n", iShw));
247	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw]))
248	{
249	X86PTE GstPte;
250	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
251	AssertRC(rc);
252
253	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));
254	pgmPoolTracDerefGCPhysHint(pPool, pPage,
255	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]),
256	GstPte.u & X86_PTE_PG_MASK,
257	iShw);
258	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw], 0);
259	}
260	}
261	break;
262	}
263
264	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
265	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
266	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
267	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
268	{
269	unsigned iGst = off / sizeof(X86PDE);
270	unsigned iShwPdpt = iGst / 256;
271	unsigned iShw = (iGst % 256) * 2;
272	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
273
274	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));
275	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
276	if (iShwPdpt == pPage->enmKind - (unsigned)PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD)
277	{
278	for (unsigned i = 0; i < 2; i++)
279	{
280	X86PGPAEUINT const uPde = uShw.pPDPae->a[iShw + i].u;
281	if (uPde & X86_PDE_P)
282	{
283	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw + i, uPde));
284	pgmPoolFree(pVM, uPde & X86_PDE_PAE_PG_MASK, pPage->idx, iShw + i);
285	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw + i].u, 0);
286	}
287
288	/* paranoia / a bit assumptive. */
289	if ( (off & 3)
290	&& (off & 3) + cbWrite > 4)
291	{
292	const unsigned iShw2 = iShw + 2 + i;
293	if (iShw2 < RT_ELEMENTS(uShw.pPDPae->a))
294	{
295	X86PGPAEUINT const uPde2 = uShw.pPDPae->a[iShw2].u;
296	if (uPde2 & X86_PDE_P)
297	{
298	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uPde2));
299	pgmPoolFree(pVM, uPde2 & X86_PDE_PAE_PG_MASK, pPage->idx, iShw2);
300	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
301	}
302	}
303	}
304	}
305	}
306	break;
307	}
308
309	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
310	{
311	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
312	const unsigned iShw = off / sizeof(X86PTEPAE);
313	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
314	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw]))
315	{
316	X86PTEPAE GstPte;
317	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
318	AssertRC(rc);
319
320	Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]), GstPte.u & X86_PTE_PAE_PG_MASK));
321	pgmPoolTracDerefGCPhysHint(pPool, pPage,
322	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw]),
323	GstPte.u & X86_PTE_PAE_PG_MASK,
324	iShw);
325	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw], 0);
326	}
327
328	/* paranoia / a bit assumptive. */
329	if ( (off & 7)
330	&& (off & 7) + cbWrite > sizeof(X86PTEPAE))
331	{
332	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTEPAE);
333	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPTPae->a));
334
335	if (PGMSHWPTEPAE_IS_P(uShw.pPTPae->a[iShw2]))
336	{
337	X86PTEPAE GstPte;
338	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte,
339	pvAddress ? (uint8_t const *)pvAddress + sizeof(GstPte) : NULL,
340	GCPhysFault + sizeof(GstPte), sizeof(GstPte));
341	AssertRC(rc);
342	Log4(("pgmPoolMonitorChainChanging pae: deref %016RX64 GCPhys %016RX64\n", PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw2]), GstPte.u & X86_PTE_PAE_PG_MASK));
343	pgmPoolTracDerefGCPhysHint(pPool, pPage,
344	PGMSHWPTEPAE_GET_HCPHYS(uShw.pPTPae->a[iShw2]),
345	GstPte.u & X86_PTE_PAE_PG_MASK,
346	iShw2);
347	PGMSHWPTEPAE_ATOMIC_SET(uShw.pPTPae->a[iShw2], 0);
348	}
349	}
350	break;
351	}
352
353	case PGMPOOLKIND_32BIT_PD:
354	{
355	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
356	const unsigned iShw = off / sizeof(X86PTE); // ASSUMING 32-bit guest paging!
357
358	LogFlow(("pgmPoolMonitorChainChanging: PGMPOOLKIND_32BIT_PD %x\n", iShw));
359	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
360	X86PGUINT const uPde = uShw.pPD->a[iShw].u;
361	if (uPde & X86_PDE_P)
362	{
363	LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uPde));
364	pgmPoolFree(pVM, uPde & X86_PDE_PG_MASK, pPage->idx, iShw);
365	ASMAtomicWriteU32(&uShw.pPD->a[iShw].u, 0);
366	}
367
368	/* paranoia / a bit assumptive. */
369	if ( (off & 3)
370	&& (off & 3) + cbWrite > sizeof(X86PTE))
371	{
372	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PTE);
373	if ( iShw2 != iShw
374	&& iShw2 < RT_ELEMENTS(uShw.pPD->a))
375	{
376	X86PGUINT const uPde2 = uShw.pPD->a[iShw2].u;
377	if (uPde2 & X86_PDE_P)
378	{
379	LogFlow(("pgmPoolMonitorChainChanging: 32 bit pd iShw=%#x: %RX64 -> freeing it!\n", iShw2, uPde2));
380	pgmPoolFree(pVM, uPde2 & X86_PDE_PG_MASK, pPage->idx, iShw2);
381	ASMAtomicWriteU32(&uShw.pPD->a[iShw2].u, 0);
382	}
383	}
384	}
385	#if 0 /* useful when running PGMAssertCR3(), a bit too troublesome for general use (TLBs). - not working any longer... */
386	if ( uShw.pPD->a[iShw].n.u1Present
387	&& !VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
388	{
389	LogFlow(("pgmPoolMonitorChainChanging: iShw=%#x: %RX32 -> freeing it!\n", iShw, uShw.pPD->a[iShw].u));
390	pgmPoolFree(pVM, uShw.pPD->a[iShw].u & X86_PDE_PG_MASK, pPage->idx, iShw);
391	ASMAtomicWriteU32(&uShw.pPD->a[iShw].u, 0);
392	}
393	#endif
394	break;
395	}
396
397	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
398	{
399	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
400	const unsigned iShw = off / sizeof(X86PDEPAE);
401	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
402
403	/*
404	* Causes trouble when the guest uses a PDE to refer to the whole page table level
405	* structure. (Invalidate here; faults later on when it tries to change the page
406	* table entries -> recheck; probably only applies to the RC case.)
407	*/
408	X86PGPAEUINT const uPde = uShw.pPDPae->a[iShw].u;
409	if (uPde & X86_PDE_P)
410	{
411	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uPde));
412	pgmPoolFree(pVM, uPde & X86_PDE_PAE_PG_MASK, pPage->idx, iShw);
413	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw].u, 0);
414	}
415
416	/* paranoia / a bit assumptive. */
417	if ( (off & 7)
418	&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
419	{
420	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
421	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
422
423	X86PGPAEUINT const uPde2 = uShw.pPDPae->a[iShw2].u;
424	if (uPde2 & X86_PDE_P)
425	{
426	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPde2));
427	pgmPoolFree(pVM, uPde2 & X86_PDE_PAE_PG_MASK, pPage->idx, iShw2);
428	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
429	}
430	}
431	break;
432	}
433
434	case PGMPOOLKIND_PAE_PDPT:
435	{
436	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
437	/*
438	* Hopefully this doesn't happen very often:
439	* - touching unused parts of the page
440	* - messing with the bits of pd pointers without changing the physical address
441	*/
442	/* PDPT roots are not page aligned; 32 byte only! */
443	const unsigned offPdpt = GCPhysFault - pPage->GCPhys;
444
445	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
446	const unsigned iShw = offPdpt / sizeof(X86PDPE);
447	if (iShw < X86_PG_PAE_PDPE_ENTRIES) /* don't use RT_ELEMENTS(uShw.pPDPT->a), because that's for long mode only */
448	{
449	X86PGPAEUINT const uPdpe = uShw.pPDPT->a[iShw].u;
450	if (uPdpe & X86_PDPE_P)
451	{
452	LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uShw.pPDPT->a[iShw].u));
453	pgmPoolFree(pVM, uPdpe & X86_PDPE_PG_MASK, pPage->idx, iShw);
454	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw].u, 0);
455	}
456
457	/* paranoia / a bit assumptive. */
458	if ( (offPdpt & 7)
459	&& (offPdpt & 7) + cbWrite > sizeof(X86PDPE))
460	{
461	const unsigned iShw2 = (offPdpt + cbWrite - 1) / sizeof(X86PDPE);
462	if ( iShw2 != iShw
463	&& iShw2 < X86_PG_PAE_PDPE_ENTRIES)
464	{
465	X86PGPAEUINT const uPdpe2 = uShw.pPDPT->a[iShw2].u;
466	if (uPdpe2 & X86_PDPE_P)
467	{
468	LogFlow(("pgmPoolMonitorChainChanging: pae pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw2, uShw.pPDPT->a[iShw2].u));
469	pgmPoolFree(pVM, uPdpe2 & X86_PDPE_PG_MASK, pPage->idx, iShw2);
470	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw2].u, 0);
471	}
472	}
473	}
474	}
475	break;
476	}
477
478	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
479	{
480	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPD));
481	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
482	const unsigned iShw = off / sizeof(X86PDEPAE);
483	X86PGPAEUINT const uPde = uShw.pPDPae->a[iShw].u;
484	if (uPde & X86_PDE_P)
485	{
486	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw=%#x: %RX64 -> freeing it!\n", iShw, uPde));
487	pgmPoolFree(pVM, uPde & X86_PDE_PAE_PG_MASK, pPage->idx, iShw);
488	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw].u, 0);
489	}
490
491	/* paranoia / a bit assumptive. */
492	if ( (off & 7)
493	&& (off & 7) + cbWrite > sizeof(X86PDEPAE))
494	{
495	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDEPAE);
496	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pPDPae->a));
497	X86PGPAEUINT const uPde2 = uShw.pPDPae->a[iShw2].u;
498	if (uPde2 & X86_PDE_P)
499	{
500	LogFlow(("pgmPoolMonitorChainChanging: pae pd iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPde2));
501	pgmPoolFree(pVM, uPde2 & X86_PDE_PAE_PG_MASK, pPage->idx, iShw2);
502	ASMAtomicWriteU64(&uShw.pPDPae->a[iShw2].u, 0);
503	}
504	}
505	break;
506	}
507
508	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
509	{
510	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPDPT));
511	/*
512	* Hopefully this doesn't happen very often:
513	* - messing with the bits of pd pointers without changing the physical address
514	*/
515	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
516	const unsigned iShw = off / sizeof(X86PDPE);
517	X86PGPAEUINT const uPdpe = uShw.pPDPT->a[iShw].u;
518	if (uPdpe & X86_PDPE_P)
519	{
520	LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw=%#x: %RX64 -> freeing it!\n", iShw, uPdpe));
521	pgmPoolFree(pVM, uPdpe & X86_PDPE_PG_MASK, pPage->idx, iShw);
522	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw].u, 0);
523	}
524	/* paranoia / a bit assumptive. */
525	if ( (off & 7)
526	&& (off & 7) + cbWrite > sizeof(X86PDPE))
527	{
528	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PDPE);
529	X86PGPAEUINT const uPdpe2 = uShw.pPDPT->a[iShw2].u;
530	if (uPdpe2 & X86_PDPE_P)
531	{
532	LogFlow(("pgmPoolMonitorChainChanging: pdpt iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPdpe2));
533	pgmPoolFree(pVM, uPdpe2 & X86_PDPE_PG_MASK, pPage->idx, iShw2);
534	ASMAtomicWriteU64(&uShw.pPDPT->a[iShw2].u, 0);
535	}
536	}
537	break;
538	}
539
540	case PGMPOOLKIND_64BIT_PML4:
541	{
542	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPML4));
543	/*
544	* Hopefully this doesn't happen very often:
545	* - messing with the bits of pd pointers without changing the physical address
546	*/
547	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
548	const unsigned iShw = off / sizeof(X86PDPE);
549	X86PGPAEUINT const uPml4e = uShw.pPML4->a[iShw].u;
550	if (uPml4e & X86_PML4E_P)
551	{
552	LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw=%#x: %RX64 -> freeing it!\n", iShw, uPml4e));
553	pgmPoolFree(pVM, uPml4e & X86_PML4E_PG_MASK, pPage->idx, iShw);
554	ASMAtomicWriteU64(&uShw.pPML4->a[iShw].u, 0);
555	}
556	/* paranoia / a bit assumptive. */
557	if ( (off & 7)
558	&& (off & 7) + cbWrite > sizeof(X86PDPE))
559	{
560	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PML4E);
561	X86PGPAEUINT const uPml4e2 = uShw.pPML4->a[iShw2].u;
562	if (uPml4e2 & X86_PML4E_P)
563	{
564	LogFlow(("pgmPoolMonitorChainChanging: pml4 iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPml4e2));
565	pgmPoolFree(pVM, uPml4e2 & X86_PML4E_PG_MASK, pPage->idx, iShw2);
566	ASMAtomicWriteU64(&uShw.pPML4->a[iShw2].u, 0);
567	}
568	}
569	break;
570	}
571
572	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
573	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
574	{
575	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
576	const unsigned iShw = off / sizeof(EPTPML4E);
577	X86PGPAEUINT const uPml4e = uShw.pPML4->a[iShw].u;
578	if (uPml4e & EPT_PRESENT_MASK)
579	{
580	Log7Func(("PML4 iShw=%#x: %RX64 (%RGp) -> freeing it!\n", iShw, uPml4e, pPage->GCPhys));
581	pgmPoolFree(pVM, uPml4e & X86_PML4E_PG_MASK, pPage->idx, iShw);
582	ASMAtomicWriteU64(&uShw.pPML4->a[iShw].u, 0);
583	}
584
585	/* paranoia / a bit assumptive. */
586	if ( (off & 7)
587	&& (off & 7) + cbWrite > sizeof(X86PML4E))
588	{
589	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(X86PML4E);
590	X86PGPAEUINT const uPml4e2 = uShw.pPML4->a[iShw2].u;
591	if (uPml4e2 & EPT_PRESENT_MASK)
592	{
593	Log7Func(("PML4 iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPml4e2));
594	pgmPoolFree(pVM, uPml4e2 & X86_PML4E_PG_MASK, pPage->idx, iShw2);
595	ASMAtomicWriteU64(&uShw.pPML4->a[iShw2].u, 0);
596	}
597	}
598	break;
599	}
600
601	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
602	{
603	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
604	const unsigned iShw = off / sizeof(EPTPDPTE);
605	X86PGPAEUINT const uPdpte = uShw.pEptPdpt->a[iShw].u;
606	if (uPdpte & EPT_PRESENT_MASK)
607	{
608	Log7Func(("EPT PDPT iShw=%#x: %RX64 (%RGp) -> freeing it!\n", iShw, uPdpte, pPage->GCPhys));
609	pgmPoolFree(pVM, uPdpte & EPT_PDPTE_PG_MASK, pPage->idx, iShw);
610	ASMAtomicWriteU64(&uShw.pEptPdpt->a[iShw].u, 0);
611	}
612
613	/* paranoia / a bit assumptive. */
614	if ( (off & 7)
615	&& (off & 7) + cbWrite > sizeof(EPTPDPTE))
616	{
617	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(EPTPDPTE);
618	X86PGPAEUINT const uPdpte2 = uShw.pEptPdpt->a[iShw2].u;
619	if (uPdpte2 & EPT_PRESENT_MASK)
620	{
621	Log7Func(("EPT PDPT iShw2=%#x: %RX64 -> freeing it!\n", iShw2, uPdpte2));
622	pgmPoolFree(pVM, uPdpte2 & EPT_PDPTE_PG_MASK, pPage->idx, iShw2);
623	ASMAtomicWriteU64(&uShw.pEptPdpt->a[iShw2].u, 0);
624	}
625	}
626	break;
627	}
628
629	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
630	{
631	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
632	const unsigned iShw = off / sizeof(EPTPDE);
633	X86PGPAEUINT const uPde = uShw.pEptPd->a[iShw].u;
634	if (uPde & EPT_PRESENT_MASK)
635	{
636	Assert(!(uPde & EPT_E_LEAF));
637	Log7Func(("EPT PD iShw=%#x: %RX64 (%RGp) -> freeing it!\n", iShw, uPde, pPage->GCPhys));
638	pgmPoolFree(pVM, uPde & EPT_PDE_PG_MASK, pPage->idx, iShw);
639	ASMAtomicWriteU64(&uShw.pEptPd->a[iShw].u, 0);
640	}
641
642	/* paranoia / a bit assumptive. */
643	if ( (off & 7)
644	&& (off & 7) + cbWrite > sizeof(EPTPDE))
645	{
646	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(EPTPDE);
647	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pEptPd->a));
648	X86PGPAEUINT const uPde2 = uShw.pEptPd->a[iShw2].u;
649	if (uPde2 & EPT_PRESENT_MASK)
650	{
651	Assert(!(uPde2 & EPT_E_LEAF));
652	Log7Func(("EPT PD (2): iShw2=%#x: %RX64 (%RGp) -> freeing it!\n", iShw2, uPde2, pPage->GCPhys));
653	pgmPoolFree(pVM, uPde2 & EPT_PDE_PG_MASK, pPage->idx, iShw2);
654	ASMAtomicWriteU64(&uShw.pEptPd->a[iShw2].u, 0);
655	}
656	}
657	break;
658	}
659
660	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
661	{
662	uShw.pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
663	const unsigned iShw = off / sizeof(EPTPTE);
664	X86PGPAEUINT const uPte = uShw.pEptPt->a[iShw].u;
665	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitor,FaultPT));
666	if (uPte & EPT_PRESENT_MASK)
667	{
668	EPTPTE GstPte;
669	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvAddress, GCPhysFault, sizeof(GstPte));
670	AssertRC(rc);
671
672	Log7Func(("EPT PT: iShw=%#x %RX64 (%RGp)\n", iShw, uPte, pPage->GCPhys));
673	pgmPoolTracDerefGCPhysHint(pPool, pPage,
674	uShw.pEptPt->a[iShw].u & EPT_PTE_PG_MASK,
675	GstPte.u & EPT_PTE_PG_MASK,
676	iShw);
677	ASMAtomicWriteU64(&uShw.pEptPt->a[iShw].u, 0);
678	}
679
680	/* paranoia / a bit assumptive. */
681	if ( (off & 7)
682	&& (off & 7) + cbWrite > sizeof(EPTPTE))
683	{
684	const unsigned iShw2 = (off + cbWrite - 1) / sizeof(EPTPTE);
685	AssertBreak(iShw2 < RT_ELEMENTS(uShw.pEptPt->a));
686	X86PGPAEUINT const uPte2 = uShw.pEptPt->a[iShw2].u;
687	if (uPte2 & EPT_PRESENT_MASK)
688	{
689	EPTPTE GstPte;
690	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte,
691	pvAddress ? (uint8_t const *)pvAddress + sizeof(GstPte) : NULL,
692	GCPhysFault + sizeof(GstPte), sizeof(GstPte));
693	AssertRC(rc);
694	Log7Func(("EPT PT (2): iShw=%#x %RX64 (%RGp)\n", iShw2, uPte2, pPage->GCPhys));
695	pgmPoolTracDerefGCPhysHint(pPool, pPage,
696	uShw.pEptPt->a[iShw2].u & EPT_PTE_PG_MASK,
697	GstPte.u & EPT_PTE_PG_MASK,
698	iShw2);
699	ASMAtomicWriteU64(&uShw.pEptPt->a[iShw2].u, 0);
700	}
701	}
702	break;
703	}
704	#endif /* VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
705
706	default:
707	AssertFatalMsgFailed(("enmKind=%d\n", pPage->enmKind));
708	}
709	PGM_DYNMAP_UNUSED_HINT_VM(pVM, uShw.pv);
710
711	/* next */
712	if (pPage->iMonitoredNext == NIL_PGMPOOL_IDX)
713	return;
714	pPage = &pPool->aPages[pPage->iMonitoredNext];
715	}
716	}
717
718	#ifndef IN_RING3
719
720	/**
721	* Checks if a access could be a fork operation in progress.
722	*
723	* Meaning, that the guest is setting up the parent process for Copy-On-Write.
724	*
725	* @returns true if it's likely that we're forking, otherwise false.
726	* @param pPool The pool.
727	* @param pDis The disassembled instruction.
728	* @param offFault The access offset.
729	*/
730	DECLINLINE(bool) pgmRZPoolMonitorIsForking(PPGMPOOL pPool, PDISSTATE pDis, unsigned offFault)
731	{
732	/*
733	* i386 linux is using btr to clear X86_PTE_RW.
734	* The functions involved are (2.6.16 source inspection):
735	* clear_bit
736	* ptep_set_wrprotect
737	* copy_one_pte
738	* copy_pte_range
739	* copy_pmd_range
740	* copy_pud_range
741	* copy_page_range
742	* dup_mmap
743	* dup_mm
744	* copy_mm
745	* copy_process
746	* do_fork
747	*/
748	if ( pDis->pCurInstr->uOpcode == OP_BTR
749	&& !(offFault & 4)
750	/** @todo Validate that the bit index is X86_PTE_RW. */
751	)
752	{
753	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,Fork)); RT_NOREF_PV(pPool);
754	return true;
755	}
756	return false;
757	}
758
759
760	/**
761	* Determine whether the page is likely to have been reused.
762	*
763	* @returns true if we consider the page as being reused for a different purpose.
764	* @returns false if we consider it to still be a paging page.
765	* @param pVM The cross context VM structure.
766	* @param pVCpu The cross context virtual CPU structure.
767	* @param pCtx Pointer to the register context for the CPU.
768	* @param pDis The disassembly info for the faulting instruction.
769	* @param pvFault The fault address.
770	* @param pPage The pool page being accessed.
771	*
772	* @remark The REP prefix check is left to the caller because of STOSD/W.
773	*/
774	DECLINLINE(bool) pgmRZPoolMonitorIsReused(PVMCC pVM, PVMCPUCC pVCpu, PCPUMCTX pCtx, PDISSTATE pDis, RTGCPTR pvFault,
775	PPGMPOOLPAGE pPage)
776	{
777	/* Locked (CR3, PDPTR*4) should not be reusable. Considering them as
778	such may cause loops booting tst-ubuntu-15_10-64-efi, ++. */
779	if (pPage->cLocked)
780	{
781	Log2(("pgmRZPoolMonitorIsReused: %RGv (%p) can't have been resued, because it's locked!\n", pvFault, pPage));
782	return false;
783	}
784
785	/** @todo could make this general, faulting close to rsp should be a safe reuse heuristic. */
786	if ( HMHasPendingIrq(pVM)
787	&& pCtx->rsp - pvFault < 32)
788	{
789	/* Fault caused by stack writes while trying to inject an interrupt event. */
790	Log(("pgmRZPoolMonitorIsReused: reused %RGv for interrupt stack (rsp=%RGv).\n", pvFault, pCtx->rsp));
791	return true;
792	}
793
794	LogFlow(("Reused instr %RGv %d at %RGv param1.fUse=%llx param1.reg=%d\n", pCtx->rip, pDis->pCurInstr->uOpcode, pvFault, pDis->Param1.fUse, pDis->Param1.arch.x86.Base.idxGenReg));
795
796	/* Non-supervisor mode write means it's used for something else. */
797	if (CPUMGetGuestCPL(pVCpu) == 3)
798	return true;
799
800	switch (pDis->pCurInstr->uOpcode)
801	{
802	/* call implies the actual push of the return address faulted */
803	case OP_CALL:
804	Log4(("pgmRZPoolMonitorIsReused: CALL\n"));
805	return true;
806	case OP_PUSH:
807	Log4(("pgmRZPoolMonitorIsReused: PUSH\n"));
808	return true;
809	case OP_PUSHF:
810	Log4(("pgmRZPoolMonitorIsReused: PUSHF\n"));
811	return true;
812	case OP_PUSHA:
813	Log4(("pgmRZPoolMonitorIsReused: PUSHA\n"));
814	return true;
815	case OP_FXSAVE:
816	Log4(("pgmRZPoolMonitorIsReused: FXSAVE\n"));
817	return true;
818	case OP_MOVNTI: /* solaris - block_zero_no_xmm */
819	Log4(("pgmRZPoolMonitorIsReused: MOVNTI\n"));
820	return true;
821	case OP_MOVNTDQ: /* solaris - hwblkclr & hwblkpagecopy */
822	Log4(("pgmRZPoolMonitorIsReused: MOVNTDQ\n"));
823	return true;
824	case OP_MOVSWD:
825	case OP_STOSWD:
826	if ( pDis->arch.x86.fPrefix == (DISPREFIX_REP\|DISPREFIX_REX)
827	&& pCtx->rcx >= 0x40
828	)
829	{
830	Assert(pDis->uCpuMode == DISCPUMODE_64BIT);
831
832	Log(("pgmRZPoolMonitorIsReused: OP_STOSQ\n"));
833	return true;
834	}
835	break;
836
837	default:
838	/*
839	* Anything having ESP on the left side means stack writes.
840	*/
841	if ( ( (pDis->Param1.fUse & DISUSE_REG_GEN32)
842	\|\| (pDis->Param1.fUse & DISUSE_REG_GEN64))
843	&& (pDis->Param1.arch.x86.Base.idxGenReg == DISGREG_ESP))
844	{
845	Log4(("pgmRZPoolMonitorIsReused: ESP\n"));
846	return true;
847	}
848	break;
849	}
850
851	/*
852	* Page table updates are very very unlikely to be crossing page boundraries,
853	* and we don't want to deal with that in pgmPoolMonitorChainChanging and such.
854	*/
855	uint32_t const cbWrite = DISGetParamSize(pDis, &pDis->Param1);
856	if ( (((uintptr_t)pvFault + cbWrite) >> X86_PAGE_SHIFT) != ((uintptr_t)pvFault >> X86_PAGE_SHIFT) )
857	{
858	Log4(("pgmRZPoolMonitorIsReused: cross page write\n"));
859	return true;
860	}
861
862	/*
863	* Nobody does an unaligned 8 byte write to a page table, right.
864	*/
865	if (cbWrite >= 8 && ((uintptr_t)pvFault & 7) != 0)
866	{
867	Log4(("pgmRZPoolMonitorIsReused: Unaligned 8+ byte write\n"));
868	return true;
869	}
870
871	return false;
872	}
873
874
875	/**
876	* Flushes the page being accessed.
877	*
878	* @returns VBox status code suitable for scheduling.
879	* @param pVM The cross context VM structure.
880	* @param pVCpu The cross context virtual CPU structure.
881	* @param pPool The pool.
882	* @param pPage The pool page (head).
883	* @param pDis The disassembly of the write instruction.
884	* @param pCtx Pointer to the register context for the CPU.
885	* @param GCPhysFault The fault address as guest physical address.
886	* @todo VBOXSTRICTRC
887	*/
888	static int pgmRZPoolAccessPfHandlerFlush(PVMCC pVM, PVMCPUCC pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISSTATE pDis,
889	PCPUMCTX pCtx, RTGCPHYS GCPhysFault)
890	{
891	NOREF(pVM); NOREF(GCPhysFault);
892
893	/*
894	* First, do the flushing.
895	*/
896	pgmPoolMonitorChainFlush(pPool, pPage);
897
898	/*
899	* Emulate the instruction (xp/w2k problem, requires pc/cr2/sp detection).
900	* Must do this in raw mode (!); XP boot will fail otherwise.
901	*/
902	int rc = VINF_SUCCESS;
903	VBOXSTRICTRC rc2 = EMInterpretInstructionDisasState(pVCpu, pDis, pCtx->rip);
904	if (rc2 == VINF_SUCCESS)
905	{ /* do nothing */ }
906	else if (rc2 == VINF_EM_RESCHEDULE)
907	{
908	rc = VBOXSTRICTRC_VAL(rc2);
909	# ifndef IN_RING3
910	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
911	# endif
912	}
913	else if (rc2 == VERR_EM_INTERPRETER)
914	{
915	rc = VINF_EM_RAW_EMULATE_INSTR;
916	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,EmulateInstr));
917	}
918	else if (RT_FAILURE_NP(rc2))
919	rc = VBOXSTRICTRC_VAL(rc2);
920	else
921	AssertMsgFailed(("%Rrc\n", VBOXSTRICTRC_VAL(rc2))); /* ASSUMES no complicated stuff here. */
922
923	LogFlow(("pgmRZPoolAccessPfHandlerFlush: returns %Rrc (flushed)\n", rc));
924	return rc;
925	}
926
927
928	/**
929	* Handles the STOSD write accesses.
930	*
931	* @returns VBox status code suitable for scheduling.
932	* @param pVM The cross context VM structure.
933	* @param pPool The pool.
934	* @param pPage The pool page (head).
935	* @param pDis The disassembly of the write instruction.
936	* @param pCtx Pointer to the register context for the CPU.
937	* @param GCPhysFault The fault address as guest physical address.
938	* @param pvFault The fault address.
939	*/
940	DECLINLINE(int) pgmRZPoolAccessPfHandlerSTOSD(PVMCC pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISSTATE pDis,
941	PCPUMCTX pCtx, RTGCPHYS GCPhysFault, RTGCPTR pvFault)
942	{
943	unsigned uIncrement = pDis->Param1.arch.x86.cb;
944	NOREF(pVM);
945
946	Assert(pDis->uCpuMode == DISCPUMODE_32BIT \|\| pDis->uCpuMode == DISCPUMODE_64BIT);
947	Assert(pCtx->rcx <= 0x20);
948
949	# ifdef VBOX_STRICT
950	if (pDis->arch.x86.uOpMode == DISCPUMODE_32BIT)
951	Assert(uIncrement == 4);
952	else
953	Assert(uIncrement == 8);
954	# endif
955
956	Log3(("pgmRZPoolAccessPfHandlerSTOSD\n"));
957
958	/*
959	* Increment the modification counter and insert it into the list
960	* of modified pages the first time.
961	*/
962	if (!pPage->cModifications++)
963	pgmPoolMonitorModifiedInsert(pPool, pPage);
964
965	/*
966	* Execute REP STOSD.
967	*
968	* This ASSUMES that we're not invoked by Trap0e on in a out-of-sync
969	* write situation, meaning that it's safe to write here.
970	*/
971	PVMCPUCC pVCpu = VMMGetCpu(pPool->CTX_SUFF(pVM));
972	RTGCUINTPTR pu32 = (RTGCUINTPTR)pvFault;
973	while (pCtx->rcx)
974	{
975	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, uIncrement);
976	PGMPhysSimpleWriteGCPhys(pVM, GCPhysFault, &pCtx->rax, uIncrement);
977	pu32 += uIncrement;
978	GCPhysFault += uIncrement;
979	pCtx->rdi += uIncrement;
980	pCtx->rcx--;
981	}
982	pCtx->rip += pDis->cbInstr;
983
984	LogFlow(("pgmRZPoolAccessPfHandlerSTOSD: returns\n"));
985	return VINF_SUCCESS;
986	}
987
988
989	/**
990	* Handles the simple write accesses.
991	*
992	* @returns VBox status code suitable for scheduling.
993	* @param pVM The cross context VM structure.
994	* @param pVCpu The cross context virtual CPU structure.
995	* @param pPool The pool.
996	* @param pPage The pool page (head).
997	* @param pDis The disassembly of the write instruction.
998	* @param pCtx Pointer to the register context for the CPU.
999	* @param GCPhysFault The fault address as guest physical address.
1000	* @param pfReused Reused state (in/out)
1001	*/
1002	DECLINLINE(int) pgmRZPoolAccessPfHandlerSimple(PVMCC pVM, PVMCPUCC pVCpu, PPGMPOOL pPool, PPGMPOOLPAGE pPage, PDISSTATE pDis,
1003	PCPUMCTX pCtx, RTGCPHYS GCPhysFault, bool *pfReused)
1004	{
1005	Log3(("pgmRZPoolAccessPfHandlerSimple\n"));
1006	NOREF(pVM);
1007	NOREF(pfReused); /* initialized by caller */
1008
1009	/*
1010	* Increment the modification counter and insert it into the list
1011	* of modified pages the first time.
1012	*/
1013	if (!pPage->cModifications++)
1014	pgmPoolMonitorModifiedInsert(pPool, pPage);
1015
1016	/*
1017	* Clear all the pages.
1018	*/
1019	uint32_t cbWrite = DISGetParamSize(pDis, &pDis->Param1);
1020	if (cbWrite <= 8)
1021	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, cbWrite);
1022	else if (cbWrite <= 16)
1023	{
1024	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault, NULL, 8);
1025	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault + 8, NULL, cbWrite - 8);
1026	}
1027	else
1028	{
1029	Assert(cbWrite <= 32);
1030	for (uint32_t off = 0; off < cbWrite; off += 8)
1031	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhysFault + off, NULL, RT_MIN(8, cbWrite - off));
1032	}
1033
1034	/*
1035	* Interpret the instruction.
1036	*/
1037	VBOXSTRICTRC rc = EMInterpretInstructionDisasState(pVCpu, pDis, pCtx->rip);
1038	if (RT_SUCCESS(rc))
1039	AssertMsg(rc == VINF_SUCCESS, ("%Rrc\n", VBOXSTRICTRC_VAL(rc))); /* ASSUMES no complicated stuff here. */
1040	else if (rc == VERR_EM_INTERPRETER)
1041	{
1042	LogFlow(("pgmRZPoolAccessPfHandlerSimple: Interpretation failed for %04x:%RGv - opcode=%d\n",
1043	pCtx->cs.Sel, (RTGCPTR)pCtx->rip, pDis->pCurInstr->uOpcode));
1044	rc = VINF_EM_RAW_EMULATE_INSTR;
1045	STAM_COUNTER_INC(&pPool->CTX_MID_Z(StatMonitorPf,EmulateInstr));
1046	}
1047
1048	# if 0 /* experimental code */
1049	if (rc == VINF_SUCCESS)
1050	{
1051	switch (pPage->enmKind)
1052	{
1053	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
1054	{
1055	X86PTEPAE GstPte;
1056	int rc = pgmPoolPhysSimpleReadGCPhys(pVM, &GstPte, pvFault, GCPhysFault, sizeof(GstPte));
1057	AssertRC(rc);
1058
1059	/* Check the new value written by the guest. If present and with a bogus physical address, then
1060	* it's fairly safe to assume the guest is reusing the PT.
1061	*/
1062	if (GstPte.n.u1Present)
1063	{
1064	RTHCPHYS HCPhys = -1;
1065	int rc = PGMPhysGCPhys2HCPhys(pVM, GstPte.u & X86_PTE_PAE_PG_MASK, &HCPhys);
1066	if (rc != VINF_SUCCESS)
1067	{
1068	*pfReused = true;
1069	STAM_COUNTER_INC(&pPool->StatForceFlushReused);
1070	}
1071	}
1072	break;
1073	}
1074	}
1075	}
1076	# endif
1077
1078	LogFlow(("pgmRZPoolAccessPfHandlerSimple: returns %Rrc\n", VBOXSTRICTRC_VAL(rc)));
1079	return VBOXSTRICTRC_VAL(rc);
1080	}
1081
1082
1083	/**
1084	* @callback_method_impl{FNPGMRZPHYSPFHANDLER,
1085	* \#PF access handler callback for page table pages.}
1086	*
1087	* @remarks The @a uUser argument is the index of the PGMPOOLPAGE.
1088	*/
1089	DECLCALLBACK(VBOXSTRICTRC) pgmRZPoolAccessPfHandler(PVMCC pVM, PVMCPUCC pVCpu, RTGCUINT uErrorCode, PCPUMCTX pCtx,
1090	RTGCPTR pvFault, RTGCPHYS GCPhysFault, uint64_t uUser)
1091	{
1092	STAM_PROFILE_START(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorRZ, a);
1093	PPGMPOOL const pPool = pVM->pgm.s.CTX_SUFF(pPool);
1094	AssertReturn(uUser < pPool->cCurPages, VERR_PGM_POOL_IPE);
1095	PPGMPOOLPAGE const pPage = &pPool->aPages[uUser];
1096	unsigned cMaxModifications;
1097	bool fForcedFlush = false;
1098	RT_NOREF_PV(uErrorCode);
1099
1100	# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
1101	AssertMsg(pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_DIRECT,
1102	("pvFault=%RGv pPage=%p:{.idx=%d} GCPhysFault=%RGp\n", pvFault, pPage, pPage->idx, GCPhysFault));
1103	# endif
1104	LogFlow(("pgmRZPoolAccessPfHandler: pvFault=%RGv pPage=%p:{.idx=%d} GCPhysFault=%RGp\n", pvFault, pPage, pPage->idx, GCPhysFault));
1105
1106	PGM_LOCK_VOID(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	PGM_UNLOCK(pVM);
1113	return VINF_SUCCESS;
1114	}
1115	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
1116	if (pPage->fDirty)
1117	{
1118	# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
1119	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage));
1120	# endif
1121	Assert(VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_TLB_FLUSH));
1122	PGM_UNLOCK(pVM);
1123	return VINF_SUCCESS; /* SMP guest case where we were blocking on the pgm lock while the same page was being marked dirty. */
1124	}
1125	# endif
1126
1127	# if 0 /* test code defined(VBOX_STRICT) && defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) */
1128	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1129	{
1130	void *pvShw = PGMPOOL_PAGE_2_PTR(pPool->CTX_SUFF(pVM), pPage);
1131	void *pvGst;
1132	int rc = PGM_GCPHYS_2_PTR(pPool->CTX_SUFF(pVM), pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1133	pgmPoolTrackCheckPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
1134	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1135	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1136	}
1137	# endif
1138
1139	# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
1140	if (PGMPOOL_PAGE_IS_NESTED(pPage))
1141	{
1142	Assert(!CPUMIsGuestInVmxNonRootMode(CPUMQueryGuestCtxPtr(pVCpu)));
1143	Log7Func(("Flushing pvFault=%RGv GCPhysFault=%RGp\n", pvFault, GCPhysFault));
1144	pgmPoolMonitorChainFlush(pPool, pPage);
1145	PGM_UNLOCK(pVM);
1146	return VINF_SUCCESS;
1147	}
1148	# endif
1149
1150	/*
1151	* Disassemble the faulting instruction.
1152	*/
1153	PDISSTATE pDis = &pVCpu->pgm.s.Dis;
1154	int rc = EMInterpretDisasCurrent(pVCpu, pDis, NULL);
1155	if (RT_UNLIKELY(rc != VINF_SUCCESS))
1156	{
1157	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("Unexpected rc %d\n", rc));
1158	PGM_UNLOCK(pVM);
1159	return rc;
1160	}
1161
1162	Assert(pPage->enmKind != PGMPOOLKIND_FREE);
1163
1164	/*
1165	* We should ALWAYS have the list head as user parameter. This
1166	* is because we use that page to record the changes.
1167	*/
1168	Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1169
1170	# ifdef IN_RING0
1171	/* Maximum nr of modifications depends on the page type. */
1172	if ( pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT
1173	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1174	cMaxModifications = 4;
1175	else
1176	cMaxModifications = 24;
1177	# else
1178	cMaxModifications = 48;
1179	# endif
1180
1181	/*
1182	* Incremental page table updates should weigh more than random ones.
1183	* (Only applies when started from offset 0)
1184	*/
1185	pVCpu->pgm.s.cPoolAccessHandler++;
1186	if ( pPage->GCPtrLastAccessHandlerRip >= pCtx->rip - 0x40 /* observed loops in Windows 7 x64 */
1187	&& pPage->GCPtrLastAccessHandlerRip < pCtx->rip + 0x40
1188	&& pvFault == (pPage->GCPtrLastAccessHandlerFault + pDis->Param1.arch.x86.cb)
1189	&& pVCpu->pgm.s.cPoolAccessHandler == pPage->cLastAccessHandler + 1)
1190	{
1191	Log(("Possible page reuse cMods=%d -> %d (locked=%d type=%s)\n", pPage->cModifications, pPage->cModifications * 2, pgmPoolIsPageLocked(pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
1192	Assert(pPage->cModifications < 32000);
1193	pPage->cModifications = pPage->cModifications * 2;
1194	pPage->GCPtrLastAccessHandlerFault = pvFault;
1195	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1196	if (pPage->cModifications >= cMaxModifications)
1197	{
1198	STAM_COUNTER_INC(&pPool->StatMonitorPfRZFlushReinit);
1199	fForcedFlush = true;
1200	}
1201	}
1202
1203	if (pPage->cModifications >= cMaxModifications)
1204	Log(("Mod overflow %RGv cMods=%d (locked=%d type=%s)\n", pvFault, pPage->cModifications, pgmPoolIsPageLocked(pPage), pgmPoolPoolKindToStr(pPage->enmKind)));
1205
1206	/*
1207	* Check if it's worth dealing with.
1208	*/
1209	bool fReused = false;
1210	bool fNotReusedNotForking = false;
1211	if ( ( pPage->cModifications < cMaxModifications /** @todo \#define / /* @todo need to check that it's not mapping EIP. / /* @todo adjust this! */
1212	\|\| pgmPoolIsPageLocked(pPage)
1213	)
1214	&& !(fReused = pgmRZPoolMonitorIsReused(pVM, pVCpu, pCtx, pDis, pvFault, pPage))
1215	&& !pgmRZPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
1216	{
1217	/*
1218	* Simple instructions, no REP prefix.
1219	*/
1220	if (!(pDis->arch.x86.fPrefix & (DISPREFIX_REP \| DISPREFIX_REPNE)))
1221	{
1222	rc = pgmRZPoolAccessPfHandlerSimple(pVM, pVCpu, pPool, pPage, pDis, pCtx, GCPhysFault, &fReused);
1223	if (fReused)
1224	goto flushPage;
1225
1226	/* A mov instruction to change the first page table entry will be remembered so we can detect
1227	* full page table changes early on. This will reduce the amount of unnecessary traps we'll take.
1228	*/
1229	if ( rc == VINF_SUCCESS
1230	&& !pPage->cLocked /* only applies to unlocked pages as we can't free locked ones (e.g. cr3 root). */
1231	&& pDis->pCurInstr->uOpcode == OP_MOV
1232	&& (pvFault & PAGE_OFFSET_MASK) == 0)
1233	{
1234	pPage->GCPtrLastAccessHandlerFault = pvFault;
1235	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1236	pPage->GCPtrLastAccessHandlerRip = pCtx->rip;
1237	/* Make sure we don't kick out a page too quickly. */
1238	if (pPage->cModifications > 8)
1239	pPage->cModifications = 2;
1240	}
1241	else if (pPage->GCPtrLastAccessHandlerFault == pvFault)
1242	{
1243	/* ignore the 2nd write to this page table entry. */
1244	pPage->cLastAccessHandler = pVCpu->pgm.s.cPoolAccessHandler;
1245	}
1246	else
1247	{
1248	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
1249	pPage->GCPtrLastAccessHandlerRip = 0;
1250	}
1251
1252	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZHandled, a);
1253	PGM_UNLOCK(pVM);
1254	return rc;
1255	}
1256
1257	/*
1258	* Windows is frequently doing small memset() operations (netio test 4k+).
1259	* We have to deal with these or we'll kill the cache and performance.
1260	*/
1261	if ( pDis->pCurInstr->uOpcode == OP_STOSWD
1262	&& !pCtx->eflags.Bits.u1DF
1263	&& pDis->arch.x86.uOpMode == pDis->uCpuMode
1264	&& pDis->arch.x86.uAddrMode == pDis->uCpuMode)
1265	{
1266	bool fValidStosd = false;
1267
1268	if ( pDis->uCpuMode == DISCPUMODE_32BIT
1269	&& pDis->arch.x86.fPrefix == DISPREFIX_REP
1270	&& pCtx->ecx <= 0x20
1271	&& pCtx->ecx * 4 <= GUEST_PAGE_SIZE - ((uintptr_t)pvFault & GUEST_PAGE_OFFSET_MASK)
1272	&& !((uintptr_t)pvFault & 3)
1273	&& (pCtx->eax == 0 \|\| pCtx->eax == 0x80) /* the two values observed. */
1274	)
1275	{
1276	fValidStosd = true;
1277	pCtx->rcx &= 0xffffffff; /* paranoia */
1278	}
1279	else
1280	if ( pDis->uCpuMode == DISCPUMODE_64BIT
1281	&& pDis->arch.x86.fPrefix == (DISPREFIX_REP \| DISPREFIX_REX)
1282	&& pCtx->rcx <= 0x20
1283	&& pCtx->rcx * 8 <= GUEST_PAGE_SIZE - ((uintptr_t)pvFault & GUEST_PAGE_OFFSET_MASK)
1284	&& !((uintptr_t)pvFault & 7)
1285	&& (pCtx->rax == 0 \|\| pCtx->rax == 0x80) /* the two values observed. */
1286	)
1287	{
1288	fValidStosd = true;
1289	}
1290
1291	if (fValidStosd)
1292	{
1293	rc = pgmRZPoolAccessPfHandlerSTOSD(pVM, pPool, pPage, pDis, pCtx, GCPhysFault, pvFault);
1294	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZRepStosd, a);
1295	PGM_UNLOCK(pVM);
1296	return rc;
1297	}
1298	}
1299
1300	/* REP prefix, don't bother. */
1301	STAM_COUNTER_INC(&pPool->StatMonitorPfRZRepPrefix);
1302	Log4(("pgmRZPoolAccessPfHandler: eax=%#x ecx=%#x edi=%#x esi=%#x rip=%RGv opcode=%d prefix=%#x\n",
1303	pCtx->eax, pCtx->ecx, pCtx->edi, pCtx->esi, (RTGCPTR)pCtx->rip, pDis->pCurInstr->uOpcode, pDis->arch.x86.fPrefix));
1304	fNotReusedNotForking = true;
1305	}
1306
1307	# if defined(PGMPOOL_WITH_OPTIMIZED_DIRTY_PT) && defined(IN_RING0)
1308	/* E.g. Windows 7 x64 initializes page tables and touches some pages in the table during the process. This
1309	* leads to pgm pool trashing and an excessive amount of write faults due to page monitoring.
1310	*/
1311	if ( pPage->cModifications >= cMaxModifications
1312	&& !fForcedFlush
1313	&& (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT \|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1314	&& ( fNotReusedNotForking
1315	\|\| ( !pgmRZPoolMonitorIsReused(pVM, pVCpu, pCtx, pDis, pvFault, pPage)
1316	&& !pgmRZPoolMonitorIsForking(pPool, pDis, GCPhysFault & PAGE_OFFSET_MASK))
1317	)
1318	)
1319	{
1320	Assert(!pgmPoolIsPageLocked(pPage));
1321	Assert(pPage->fDirty == false);
1322
1323	/* Flush any monitored duplicates as we will disable write protection. */
1324	if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
1325	\|\| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
1326	{
1327	PPGMPOOLPAGE pPageHead = pPage;
1328
1329	/* Find the monitor head. */
1330	while (pPageHead->iMonitoredPrev != NIL_PGMPOOL_IDX)
1331	pPageHead = &pPool->aPages[pPageHead->iMonitoredPrev];
1332
1333	while (pPageHead)
1334	{
1335	unsigned idxNext = pPageHead->iMonitoredNext;
1336
1337	if (pPageHead != pPage)
1338	{
1339	STAM_COUNTER_INC(&pPool->StatDirtyPageDupFlush);
1340	Log(("Flush duplicate page idx=%d GCPhys=%RGp type=%s\n", pPageHead->idx, pPageHead->GCPhys, pgmPoolPoolKindToStr(pPageHead->enmKind)));
1341	int rc2 = pgmPoolFlushPage(pPool, pPageHead);
1342	AssertRC(rc2);
1343	}
1344
1345	if (idxNext == NIL_PGMPOOL_IDX)
1346	break;
1347
1348	pPageHead = &pPool->aPages[idxNext];
1349	}
1350	}
1351
1352	/* The flushing above might fail for locked pages, so double check. */
1353	if ( pPage->iMonitoredNext == NIL_PGMPOOL_IDX
1354	&& pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
1355	{
1356	pgmPoolAddDirtyPage(pVM, pPool, pPage);
1357
1358	/* Temporarily allow write access to the page table again. */
1359	rc = PGMHandlerPhysicalPageTempOff(pVM,
1360	pPage->GCPhys & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK,
1361	pPage->GCPhys & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK);
1362	if (rc == VINF_SUCCESS)
1363	{
1364	rc = PGMShwMakePageWritable(pVCpu, pvFault, PGM_MK_PG_IS_WRITE_FAULT);
1365	AssertMsg(rc == VINF_SUCCESS
1366	/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
1367	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT
1368	\|\| rc == VERR_PAGE_NOT_PRESENT,
1369	("PGMShwModifyPage -> GCPtr=%RGv rc=%d\n", pvFault, rc));
1370	# ifdef VBOX_STRICT
1371	pPage->GCPtrDirtyFault = pvFault;
1372	# endif
1373
1374	STAM_PROFILE_STOP(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, a);
1375	PGM_UNLOCK(pVM);
1376	return rc;
1377	}
1378	}
1379	}
1380	# endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT && IN_RING0 */
1381
1382	STAM_COUNTER_INC(&pPool->StatMonitorPfRZFlushModOverflow);
1383	flushPage:
1384	/*
1385	* Not worth it, so flush it.
1386	*
1387	* If we considered it to be reused, don't go back to ring-3
1388	* to emulate failed instructions since we usually cannot
1389	* interpret then. This may be a bit risky, in which case
1390	* the reuse detection must be fixed.
1391	*/
1392	rc = pgmRZPoolAccessPfHandlerFlush(pVM, pVCpu, pPool, pPage, pDis, pCtx, GCPhysFault);
1393	if ( rc == VINF_EM_RAW_EMULATE_INSTR
1394	&& fReused)
1395	{
1396	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage)); /* temporary, remove later. */
1397	/* Make sure that the current instruction still has shadow page backing, otherwise we'll end up in a loop. */
1398	if (PGMShwGetPage(pVCpu, pCtx->rip, NULL, NULL) == VINF_SUCCESS)
1399	rc = VINF_SUCCESS; /* safe to restart the instruction. */
1400	}
1401	STAM_PROFILE_STOP_EX(&pVM->pgm.s.CTX_SUFF(pPool)->StatMonitorPfRZ, &pPool->StatMonitorPfRZFlushPage, a);
1402	PGM_UNLOCK(pVM);
1403	return rc;
1404	}
1405
1406	#endif /* !IN_RING3 */
1407
1408	/**
1409	* @callback_method_impl{FNPGMPHYSHANDLER,
1410	* Access handler for shadowed page table pages.}
1411	*
1412	* @remarks Only uses the VINF_PGM_HANDLER_DO_DEFAULT status.
1413	* @note The @a uUser argument is the index of the PGMPOOLPAGE.
1414	*/
1415	DECLCALLBACK(VBOXSTRICTRC)
1416	pgmPoolAccessHandler(PVMCC pVM, PVMCPUCC pVCpu, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf,
1417	PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, uint64_t uUser)
1418	{
1419	PPGMPOOL const pPool = pVM->pgm.s.CTX_SUFF(pPool);
1420	STAM_PROFILE_START(&pPool->CTX_SUFF_Z(StatMonitor), a);
1421	AssertReturn(uUser < pPool->cCurPages, VERR_PGM_POOL_IPE);
1422	PPGMPOOLPAGE const pPage = &pPool->aPages[uUser];
1423	LogFlow(("PGM_ALL_CB_DECL: GCPhys=%RGp %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
1424	GCPhys, pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
1425
1426	NOREF(pvPhys); NOREF(pvBuf); NOREF(enmAccessType);
1427
1428	PGM_LOCK_VOID(pVM);
1429
1430	#ifdef VBOX_WITH_STATISTICS
1431	/*
1432	* Collect stats on the access.
1433	*/
1434	AssertCompile(RT_ELEMENTS(pPool->CTX_MID_Z(aStatMonitor,Sizes)) == 19);
1435	if (cbBuf <= 16 && cbBuf > 0)
1436	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[cbBuf - 1]);
1437	else if (cbBuf >= 17 && cbBuf < 32)
1438	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[16]);
1439	else if (cbBuf >= 32 && cbBuf < 64)
1440	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[17]);
1441	else if (cbBuf >= 64)
1442	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Sizes)[18]);
1443
1444	uint8_t cbAlign;
1445	switch (pPage->enmKind)
1446	{
1447	default:
1448	cbAlign = 7;
1449	break;
1450	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
1451	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
1452	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
1453	case PGMPOOLKIND_32BIT_PD:
1454	case PGMPOOLKIND_32BIT_PD_PHYS:
1455	cbAlign = 3;
1456	break;
1457	}
1458	AssertCompile(RT_ELEMENTS(pPool->CTX_MID_Z(aStatMonitor,Misaligned)) == 7);
1459	if ((uint8_t)GCPhys & cbAlign)
1460	STAM_COUNTER_INC(&pPool->CTX_MID_Z(aStatMonitor,Misaligned)[((uint8_t)GCPhys & cbAlign) - 1]);
1461	#endif
1462
1463	/*
1464	* Make sure the pool page wasn't modified by a different CPU.
1465	*/
1466	if (PHYS_PAGE_ADDRESS(GCPhys) == PHYS_PAGE_ADDRESS(pPage->GCPhys))
1467	{
1468	Assert(pPage->enmKind != PGMPOOLKIND_FREE);
1469
1470	/* The max modification count before flushing depends on the context and page type. */
1471	#ifdef IN_RING3
1472	uint16_t const cMaxModifications = 96; /* it's cheaper here, right? */
1473	#else
1474	uint16_t cMaxModifications;
1475	if ( pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT
1476	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1477	cMaxModifications = 4;
1478	else
1479	cMaxModifications = 24;
1480	#endif
1481
1482	/*
1483	* We don't have to be very sophisticated about this since there are relativly few calls here.
1484	* However, we must try our best to detect any non-cpu accesses (disk / networking).
1485	*/
1486	if ( ( pPage->cModifications < cMaxModifications
1487	\|\| pgmPoolIsPageLocked(pPage) )
1488	&& enmOrigin != PGMACCESSORIGIN_DEVICE
1489	&& cbBuf <= 16)
1490	{
1491	/* Clear the shadow entry. */
1492	if (!pPage->cModifications++)
1493	pgmPoolMonitorModifiedInsert(pPool, pPage);
1494
1495	if (cbBuf <= 8)
1496	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys, pvBuf, (uint32_t)cbBuf);
1497	else
1498	{
1499	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys, pvBuf, 8);
1500	pgmPoolMonitorChainChanging(pVCpu, pPool, pPage, GCPhys + 8, (uint8_t *)pvBuf + 8, (uint32_t)cbBuf - 8);
1501	}
1502	}
1503	else
1504	pgmPoolMonitorChainFlush(pPool, pPage);
1505
1506	STAM_PROFILE_STOP_EX(&pPool->CTX_SUFF_Z(StatMonitor), &pPool->CTX_MID_Z(StatMonitor,FlushPage), a);
1507	}
1508	else
1509	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)));
1510	PGM_UNLOCK(pVM);
1511	return VINF_PGM_HANDLER_DO_DEFAULT;
1512	}
1513
1514
1515	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
1516
1517	# if defined(VBOX_STRICT) && !defined(IN_RING3)
1518
1519	/**
1520	* Check references to guest physical memory in a PAE / PAE page table.
1521	*
1522	* @param pPool The pool.
1523	* @param pPage The page.
1524	* @param pShwPT The shadow page table (mapping of the page).
1525	* @param pGstPT The guest page table.
1526	*/
1527	static void pgmPoolTrackCheckPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT)
1528	{
1529	unsigned cErrors = 0;
1530	int LastRc = -1; /* initialized to shut up gcc */
1531	unsigned LastPTE = ~0U; /* initialized to shut up gcc */
1532	RTHCPHYS LastHCPhys = NIL_RTHCPHYS; /* initialized to shut up gcc */
1533	PVMCC pVM = pPool->CTX_SUFF(pVM);
1534
1535	# ifdef VBOX_STRICT
1536	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1537	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1538	# endif
1539	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1540	{
1541	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1542	{
1543	RTHCPHYS HCPhys = NIL_RTHCPHYS;
1544	int rc = PGMPhysGCPhys2HCPhys(pVM, pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
1545	if ( rc != VINF_SUCCESS
1546	\|\| PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) != HCPhys)
1547	{
1548	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));
1549	LastPTE = i;
1550	LastRc = rc;
1551	LastHCPhys = HCPhys;
1552	cErrors++;
1553
1554	RTHCPHYS HCPhysPT = NIL_RTHCPHYS;
1555	rc = PGMPhysGCPhys2HCPhys(pVM, pPage->GCPhys, &HCPhysPT);
1556	AssertRC(rc);
1557
1558	for (unsigned iPage = 0; iPage < pPool->cCurPages; iPage++)
1559	{
1560	PPGMPOOLPAGE pTempPage = &pPool->aPages[iPage];
1561
1562	if (pTempPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1563	{
1564	PPGMSHWPTPAE pShwPT2 = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pTempPage);
1565
1566	for (unsigned j = 0; j < RT_ELEMENTS(pShwPT->a); j++)
1567	{
1568	if ( PGMSHWPTEPAE_IS_P_RW(pShwPT2->a[j])
1569	&& PGMSHWPTEPAE_GET_HCPHYS(pShwPT2->a[j]) == HCPhysPT)
1570	{
1571	Log(("GCPhys=%RGp idx=%d %RX64 vs %RX64\n", pTempPage->GCPhys, j, PGMSHWPTEPAE_GET_LOG(pShwPT->a[j]), PGMSHWPTEPAE_GET_LOG(pShwPT2->a[j])));
1572	}
1573	}
1574
1575	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPT2);
1576	}
1577	}
1578	}
1579	}
1580	}
1581	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));
1582	}
1583
1584
1585	/**
1586	* Check references to guest physical memory in a PAE / 32-bit page table.
1587	*
1588	* @param pPool The pool.
1589	* @param pPage The page.
1590	* @param pShwPT The shadow page table (mapping of the page).
1591	* @param pGstPT The guest page table.
1592	*/
1593	static void pgmPoolTrackCheckPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT)
1594	{
1595	unsigned cErrors = 0;
1596	int LastRc = -1; /* initialized to shut up gcc */
1597	unsigned LastPTE = ~0U; /* initialized to shut up gcc */
1598	RTHCPHYS LastHCPhys = NIL_RTHCPHYS; /* initialized to shut up gcc */
1599	PVMCC pVM = pPool->CTX_SUFF(pVM);
1600
1601	# ifdef VBOX_STRICT
1602	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1603	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1604	# endif
1605	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1606	{
1607	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1608	{
1609	RTHCPHYS HCPhys = NIL_RTHCPHYS;
1610	int rc = PGMPhysGCPhys2HCPhys(pVM, pGstPT->a[i].u & X86_PTE_PG_MASK, &HCPhys);
1611	if ( rc != VINF_SUCCESS
1612	\|\| PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]) != HCPhys)
1613	{
1614	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));
1615	LastPTE = i;
1616	LastRc = rc;
1617	LastHCPhys = HCPhys;
1618	cErrors++;
1619
1620	RTHCPHYS HCPhysPT = NIL_RTHCPHYS;
1621	rc = PGMPhysGCPhys2HCPhys(pVM, pPage->GCPhys, &HCPhysPT);
1622	AssertRC(rc);
1623
1624	for (unsigned iPage = 0; iPage < pPool->cCurPages; iPage++)
1625	{
1626	PPGMPOOLPAGE pTempPage = &pPool->aPages[iPage];
1627
1628	if (pTempPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_32BIT_PT)
1629	{
1630	PPGMSHWPTPAE pShwPT2 = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pTempPage);
1631
1632	for (unsigned j = 0; j < RT_ELEMENTS(pShwPT->a); j++)
1633	{
1634	if ( PGMSHWPTEPAE_IS_P_RW(pShwPT2->a[j])
1635	&& PGMSHWPTEPAE_GET_HCPHYS(pShwPT2->a[j]) == HCPhysPT)
1636	{
1637	Log(("GCPhys=%RGp idx=%d %RX64 vs %RX64\n", pTempPage->GCPhys, j, PGMSHWPTEPAE_GET_LOG(pShwPT->a[j]), PGMSHWPTEPAE_GET_LOG(pShwPT2->a[j])));
1638	}
1639	}
1640
1641	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPT2);
1642	}
1643	}
1644	}
1645	}
1646	}
1647	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));
1648	}
1649
1650	# endif /* VBOX_STRICT && !IN_RING3 */
1651
1652	/**
1653	* Clear references to guest physical memory in a PAE / PAE page table.
1654	*
1655	* @returns nr of changed PTEs
1656	* @param pPool The pool.
1657	* @param pPage The page.
1658	* @param pShwPT The shadow page table (mapping of the page).
1659	* @param pGstPT The guest page table.
1660	* @param pOldGstPT The old cached guest page table.
1661	* @param fAllowRemoval Bail out as soon as we encounter an invalid PTE
1662	* @param pfFlush Flush reused page table (out)
1663	*/
1664	DECLINLINE(unsigned) pgmPoolTrackFlushPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT,
1665	PCX86PTPAE pOldGstPT, bool fAllowRemoval, bool *pfFlush)
1666	{
1667	unsigned cChanged = 0;
1668
1669	# ifdef VBOX_STRICT
1670	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1671	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1672	# endif
1673	*pfFlush = false;
1674
1675	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1676	{
1677	/* Check the new value written by the guest. If present and with a bogus physical address, then
1678	* it's fairly safe to assume the guest is reusing the PT.
1679	*/
1680	if ( fAllowRemoval
1681	&& (pGstPT->a[i].u & X86_PTE_P))
1682	{
1683	if (!PGMPhysIsGCPhysValid(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
1684	{
1685	*pfFlush = true;
1686	return ++cChanged;
1687	}
1688	}
1689	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1690	{
1691	/* If the old cached PTE is identical, then there's no need to flush the shadow copy. */
1692	if ((pGstPT->a[i].u & X86_PTE_PAE_PG_MASK) == (pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK))
1693	{
1694	# ifdef VBOX_STRICT
1695	RTHCPHYS HCPhys = NIL_RTGCPHYS;
1696	int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK, &HCPhys);
1697	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));
1698	# endif
1699	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);
1700	bool fHostRW = !!(PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & X86_PTE_RW);
1701	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);
1702	bool fGuestRW = !!(pGstPT->a[i].u & X86_PTE_RW);
1703
1704	if ( uHostAttr == uGuestAttr
1705	&& fHostRW <= fGuestRW)
1706	continue;
1707	}
1708	cChanged++;
1709	/* Something was changed, so flush it. */
1710	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX64 hint=%RX64\n",
1711	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
1712	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PAE_PG_MASK, i);
1713	PGMSHWPTEPAE_ATOMIC_SET(pShwPT->a[i], 0);
1714	}
1715	}
1716	return cChanged;
1717	}
1718
1719
1720	/**
1721	* Clear references to guest physical memory in a PAE / PAE page table.
1722	*
1723	* @returns nr of changed PTEs
1724	* @param pPool The pool.
1725	* @param pPage The page.
1726	* @param pShwPT The shadow page table (mapping of the page).
1727	* @param pGstPT The guest page table.
1728	* @param pOldGstPT The old cached guest page table.
1729	* @param fAllowRemoval Bail out as soon as we encounter an invalid PTE
1730	* @param pfFlush Flush reused page table (out)
1731	*/
1732	DECLINLINE(unsigned) pgmPoolTrackFlushPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT,
1733	PCX86PT pOldGstPT, bool fAllowRemoval, bool *pfFlush)
1734	{
1735	unsigned cChanged = 0;
1736
1737	# ifdef VBOX_STRICT
1738	for (unsigned i = 0; i < RT_MIN(RT_ELEMENTS(pShwPT->a), pPage->iFirstPresent); i++)
1739	AssertMsg(!PGMSHWPTEPAE_IS_P(pShwPT->a[i]), ("Unexpected PTE: idx=%d %RX64 (first=%d)\n", i, PGMSHWPTEPAE_GET_LOG(pShwPT->a[i]), pPage->iFirstPresent));
1740	# endif
1741	*pfFlush = false;
1742
1743	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
1744	{
1745	/* Check the new value written by the guest. If present and with a bogus physical address, then
1746	* it's fairly safe to assume the guest is reusing the PT. */
1747	if (fAllowRemoval)
1748	{
1749	X86PGUINT const uPte = pGstPT->a[i].u;
1750	if ( (uPte & X86_PTE_P)
1751	&& !PGMPhysIsGCPhysValid(pPool->CTX_SUFF(pVM), uPte & X86_PTE_PG_MASK))
1752	{
1753	*pfFlush = true;
1754	return ++cChanged;
1755	}
1756	}
1757	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
1758	{
1759	/* If the old cached PTE is identical, then there's no need to flush the shadow copy. */
1760	if ((pGstPT->a[i].u & X86_PTE_PG_MASK) == (pOldGstPT->a[i].u & X86_PTE_PG_MASK))
1761	{
1762	# ifdef VBOX_STRICT
1763	RTHCPHYS HCPhys = NIL_RTGCPHYS;
1764	int rc = PGMPhysGCPhys2HCPhys(pPool->CTX_SUFF(pVM), pGstPT->a[i].u & X86_PTE_PG_MASK, &HCPhys);
1765	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));
1766	# endif
1767	uint64_t uHostAttr = PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G);
1768	bool fHostRW = !!(PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & X86_PTE_RW);
1769	uint64_t uGuestAttr = pGstPT->a[i].u & (X86_PTE_P \| X86_PTE_US \| X86_PTE_A \| X86_PTE_D \| X86_PTE_G);
1770	bool fGuestRW = !!(pGstPT->a[i].u & X86_PTE_RW);
1771
1772	if ( uHostAttr == uGuestAttr
1773	&& fHostRW <= fGuestRW)
1774	continue;
1775	}
1776	cChanged++;
1777	/* Something was changed, so flush it. */
1778	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX64 hint=%x\n",
1779	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PG_MASK));
1780	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pOldGstPT->a[i].u & X86_PTE_PG_MASK, i);
1781	PGMSHWPTEPAE_ATOMIC_SET(pShwPT->a[i], 0);
1782	}
1783	}
1784	return cChanged;
1785	}
1786
1787
1788	/**
1789	* Flush a dirty page
1790	*
1791	* @param pVM The cross context VM structure.
1792	* @param pPool The pool.
1793	* @param idxSlot Dirty array slot index
1794	* @param fAllowRemoval Allow a reused page table to be removed
1795	*/
1796	static void pgmPoolFlushDirtyPage(PVMCC pVM, PPGMPOOL pPool, unsigned idxSlot, bool fAllowRemoval = false)
1797	{
1798	AssertCompile(RT_ELEMENTS(pPool->aidxDirtyPages) == RT_ELEMENTS(pPool->aDirtyPages));
1799
1800	Assert(idxSlot < RT_ELEMENTS(pPool->aDirtyPages));
1801	unsigned idxPage = pPool->aidxDirtyPages[idxSlot];
1802	if (idxPage == NIL_PGMPOOL_IDX)
1803	return;
1804
1805	PPGMPOOLPAGE pPage = &pPool->aPages[idxPage];
1806	Assert(pPage->idx == idxPage);
1807	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1808
1809	AssertMsg(pPage->fDirty, ("Page %RGp (slot=%d) not marked dirty!", pPage->GCPhys, idxSlot));
1810	Log(("Flush dirty page %RGp cMods=%d\n", pPage->GCPhys, pPage->cModifications));
1811
1812	/* First write protect the page again to catch all write accesses. (before checking for changes -> SMP) */
1813	int rc = PGMHandlerPhysicalReset(pVM, pPage->GCPhys & ~(RTGCPHYS)GUEST_PAGE_OFFSET_MASK);
1814	Assert(rc == VINF_SUCCESS);
1815	pPage->fDirty = false;
1816
1817	# ifdef VBOX_STRICT
1818	uint64_t fFlags = 0;
1819	RTHCPHYS HCPhys;
1820	rc = PGMShwGetPage(VMMGetCpu(pVM), pPage->GCPtrDirtyFault, &fFlags, &HCPhys);
1821	AssertMsg( ( rc == VINF_SUCCESS
1822	&& (!(fFlags & X86_PTE_RW) \|\| HCPhys != pPage->Core.Key))
1823	/* In the SMP case the page table might be removed while we wait for the PGM lock in the trap handler. */
1824	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT
1825	\|\| rc == VERR_PAGE_NOT_PRESENT,
1826	("PGMShwGetPage -> GCPtr=%RGv rc=%d flags=%RX64\n", pPage->GCPtrDirtyFault, rc, fFlags));
1827	# endif
1828
1829	/* Flush those PTEs that have changed. */
1830	STAM_PROFILE_START(&pPool->StatTrackDeref,a);
1831	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
1832	void *pvGst;
1833	rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1834	bool fFlush;
1835	unsigned cChanges;
1836
1837	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1838	cChanges = pgmPoolTrackFlushPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst,
1839	(PCX86PTPAE)&pPool->aDirtyPages[idxSlot].aPage[0], fAllowRemoval, &fFlush);
1840	else
1841	{
1842	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage)); /* temporary, remove later. */
1843	cChanges = pgmPoolTrackFlushPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst,
1844	(PCX86PT)&pPool->aDirtyPages[idxSlot].aPage[0], fAllowRemoval, &fFlush);
1845	}
1846
1847	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1848	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1849	STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
1850	/* Note: we might want to consider keeping the dirty page active in case there were many changes. */
1851
1852	/* This page is likely to be modified again, so reduce the nr of modifications just a bit here. */
1853	Assert(pPage->cModifications);
1854	if (cChanges < 4)
1855	pPage->cModifications = 1; /* must use > 0 here */
1856	else
1857	pPage->cModifications = RT_MAX(1, pPage->cModifications / 2);
1858
1859	STAM_COUNTER_INC(&pPool->StatResetDirtyPages);
1860	if (pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages))
1861	pPool->idxFreeDirtyPage = idxSlot;
1862
1863	pPool->cDirtyPages--;
1864	pPool->aidxDirtyPages[idxSlot] = NIL_PGMPOOL_IDX;
1865	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
1866	if (fFlush)
1867	{
1868	Assert(fAllowRemoval);
1869	Log(("Flush reused page table!\n"));
1870	pgmPoolFlushPage(pPool, pPage);
1871	STAM_COUNTER_INC(&pPool->StatForceFlushReused);
1872	}
1873	else
1874	Log(("Removed dirty page %RGp cMods=%d cChanges=%d\n", pPage->GCPhys, pPage->cModifications, cChanges));
1875	}
1876
1877
1878	# ifndef IN_RING3
1879	/**
1880	* Add a new dirty page
1881	*
1882	* @param pVM The cross context VM structure.
1883	* @param pPool The pool.
1884	* @param pPage The page.
1885	*/
1886	void pgmPoolAddDirtyPage(PVMCC pVM, PPGMPOOL pPool, PPGMPOOLPAGE pPage)
1887	{
1888	PGM_LOCK_ASSERT_OWNER(pVM);
1889	AssertCompile(RT_ELEMENTS(pPool->aDirtyPages) == 8 \|\| RT_ELEMENTS(pPool->aDirtyPages) == 16);
1890	Assert(!pPage->fDirty);
1891	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage));
1892
1893	unsigned idxFree = pPool->idxFreeDirtyPage;
1894	Assert(idxFree < RT_ELEMENTS(pPool->aDirtyPages));
1895	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX && pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
1896
1897	if (pPool->cDirtyPages >= RT_ELEMENTS(pPool->aDirtyPages))
1898	{
1899	STAM_COUNTER_INC(&pPool->StatDirtyPageOverFlowFlush);
1900	pgmPoolFlushDirtyPage(pVM, pPool, idxFree, true /* allow removal of reused page tables*/);
1901	}
1902	Assert(pPool->cDirtyPages < RT_ELEMENTS(pPool->aDirtyPages));
1903	AssertMsg(pPool->aidxDirtyPages[idxFree] == NIL_PGMPOOL_IDX, ("idxFree=%d cDirtyPages=%d\n", idxFree, pPool->cDirtyPages));
1904
1905	Log(("Add dirty page %RGp (slot=%d)\n", pPage->GCPhys, idxFree));
1906
1907	/*
1908	* Make a copy of the guest page table as we require valid GCPhys addresses
1909	* when removing references to physical pages.
1910	* (The HCPhys linear lookup is extremely expensive!)
1911	*/
1912	void *pvGst;
1913	int rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
1914	memcpy(&pPool->aDirtyPages[idxFree].aPage[0], pvGst,
1915	pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT ? PAGE_SIZE : PAGE_SIZE / 2);
1916	# ifdef VBOX_STRICT
1917	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
1918	if (pPage->enmKind == PGMPOOLKIND_PAE_PT_FOR_PAE_PT)
1919	pgmPoolTrackCheckPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
1920	else
1921	pgmPoolTrackCheckPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst);
1922	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
1923	# endif
1924	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
1925
1926	STAM_COUNTER_INC(&pPool->StatDirtyPage);
1927	pPage->fDirty = true;
1928	pPage->idxDirtyEntry = (uint8_t)idxFree; Assert(pPage->idxDirtyEntry == idxFree);
1929	pPool->aidxDirtyPages[idxFree] = pPage->idx;
1930	pPool->cDirtyPages++;
1931
1932	pPool->idxFreeDirtyPage = (pPool->idxFreeDirtyPage + 1) & (RT_ELEMENTS(pPool->aDirtyPages) - 1);
1933	if ( pPool->cDirtyPages < RT_ELEMENTS(pPool->aDirtyPages)
1934	&& pPool->aidxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
1935	{
1936	unsigned i;
1937	for (i = 1; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
1938	{
1939	idxFree = (pPool->idxFreeDirtyPage + i) & (RT_ELEMENTS(pPool->aDirtyPages) - 1);
1940	if (pPool->aidxDirtyPages[idxFree] == NIL_PGMPOOL_IDX)
1941	{
1942	pPool->idxFreeDirtyPage = idxFree;
1943	break;
1944	}
1945	}
1946	Assert(i != RT_ELEMENTS(pPool->aDirtyPages));
1947	}
1948
1949	Assert(pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages) \|\| pPool->aidxDirtyPages[pPool->idxFreeDirtyPage] == NIL_PGMPOOL_IDX);
1950
1951	/*
1952	* Clear all references to this shadow table. See @bugref{7298}.
1953	*/
1954	pgmPoolTrackClearPageUsers(pPool, pPage);
1955	}
1956	# endif /* !IN_RING3 */
1957
1958
1959	/**
1960	* Check if the specified page is dirty (not write monitored)
1961	*
1962	* @return dirty or not
1963	* @param pVM The cross context VM structure.
1964	* @param GCPhys Guest physical address
1965	*/
1966	bool pgmPoolIsDirtyPageSlow(PVMCC pVM, RTGCPHYS GCPhys)
1967	{
1968	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1969	PGM_LOCK_ASSERT_OWNER(pVM);
1970	if (!pPool->cDirtyPages)
1971	return false;
1972
1973	GCPhys = GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
1974
1975	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
1976	{
1977	unsigned idxPage = pPool->aidxDirtyPages[i];
1978	if (idxPage != NIL_PGMPOOL_IDX)
1979	{
1980	PPGMPOOLPAGE pPage = &pPool->aPages[idxPage];
1981	if (pPage->GCPhys == GCPhys)
1982	return true;
1983	}
1984	}
1985	return false;
1986	}
1987
1988
1989	/**
1990	* Reset all dirty pages by reinstating page monitoring.
1991	*
1992	* @param pVM The cross context VM structure.
1993	*/
1994	void pgmPoolResetDirtyPages(PVMCC pVM)
1995	{
1996	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
1997	PGM_LOCK_ASSERT_OWNER(pVM);
1998	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
1999
2000	if (!pPool->cDirtyPages)
2001	return;
2002
2003	Log(("pgmPoolResetDirtyPages\n"));
2004	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2005	pgmPoolFlushDirtyPage(pVM, pPool, i, true /* allow removal of reused page tables*/);
2006
2007	pPool->idxFreeDirtyPage = 0;
2008	if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aDirtyPages)
2009	&& pPool->aidxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
2010	{
2011	unsigned i;
2012	for (i = 1; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2013	{
2014	if (pPool->aidxDirtyPages[i] == NIL_PGMPOOL_IDX)
2015	{
2016	pPool->idxFreeDirtyPage = i;
2017	break;
2018	}
2019	}
2020	AssertMsg(i != RT_ELEMENTS(pPool->aDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
2021	}
2022
2023	Assert(pPool->aidxDirtyPages[pPool->idxFreeDirtyPage] == NIL_PGMPOOL_IDX \|\| pPool->cDirtyPages == RT_ELEMENTS(pPool->aDirtyPages));
2024	return;
2025	}
2026
2027
2028	/**
2029	* Invalidate the PT entry for the specified page
2030	*
2031	* @param pVM The cross context VM structure.
2032	* @param GCPtrPage Guest page to invalidate
2033	*/
2034	void pgmPoolResetDirtyPage(PVMCC pVM, RTGCPTR GCPtrPage)
2035	{
2036	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2037	PGM_LOCK_ASSERT_OWNER(pVM);
2038	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
2039
2040	if (!pPool->cDirtyPages)
2041	return;
2042
2043	Log(("pgmPoolResetDirtyPage %RGv\n", GCPtrPage)); RT_NOREF_PV(GCPtrPage);
2044	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2045	{
2046	/** @todo What was intended here??? This looks incomplete... */
2047	}
2048	}
2049
2050
2051	/**
2052	* Reset all dirty pages by reinstating page monitoring.
2053	*
2054	* @param pVM The cross context VM structure.
2055	* @param GCPhysPT Physical address of the page table
2056	*/
2057	void pgmPoolInvalidateDirtyPage(PVMCC pVM, RTGCPHYS GCPhysPT)
2058	{
2059	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2060	PGM_LOCK_ASSERT_OWNER(pVM);
2061	Assert(pPool->cDirtyPages <= RT_ELEMENTS(pPool->aDirtyPages));
2062	unsigned idxDirtyPage = RT_ELEMENTS(pPool->aDirtyPages);
2063
2064	if (!pPool->cDirtyPages)
2065	return;
2066
2067	GCPhysPT = GCPhysPT & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2068
2069	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2070	{
2071	unsigned idxPage = pPool->aidxDirtyPages[i];
2072	if (idxPage != NIL_PGMPOOL_IDX)
2073	{
2074	PPGMPOOLPAGE pPage = &pPool->aPages[idxPage];
2075	if (pPage->GCPhys == GCPhysPT)
2076	{
2077	idxDirtyPage = i;
2078	break;
2079	}
2080	}
2081	}
2082
2083	if (idxDirtyPage != RT_ELEMENTS(pPool->aDirtyPages))
2084	{
2085	pgmPoolFlushDirtyPage(pVM, pPool, idxDirtyPage, true /* allow removal of reused page tables*/);
2086	if ( pPool->cDirtyPages != RT_ELEMENTS(pPool->aDirtyPages)
2087	&& pPool->aidxDirtyPages[pPool->idxFreeDirtyPage] != NIL_PGMPOOL_IDX)
2088	{
2089	unsigned i;
2090	for (i = 0; i < RT_ELEMENTS(pPool->aDirtyPages); i++)
2091	{
2092	if (pPool->aidxDirtyPages[i] == NIL_PGMPOOL_IDX)
2093	{
2094	pPool->idxFreeDirtyPage = i;
2095	break;
2096	}
2097	}
2098	AssertMsg(i != RT_ELEMENTS(pPool->aDirtyPages), ("cDirtyPages %d", pPool->cDirtyPages));
2099	}
2100	}
2101	}
2102
2103	#endif /* PGMPOOL_WITH_OPTIMIZED_DIRTY_PT */
2104
2105	/**
2106	* Inserts a page into the GCPhys hash table.
2107	*
2108	* @param pPool The pool.
2109	* @param pPage The page.
2110	*/
2111	DECLINLINE(void) pgmPoolHashInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2112	{
2113	Log3(("pgmPoolHashInsert: %RGp\n", pPage->GCPhys));
2114	Assert(pPage->GCPhys != NIL_RTGCPHYS); Assert(pPage->iNext == NIL_PGMPOOL_IDX);
2115	uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
2116	pPage->iNext = pPool->aiHash[iHash];
2117	pPool->aiHash[iHash] = pPage->idx;
2118	}
2119
2120
2121	/**
2122	* Removes a page from the GCPhys hash table.
2123	*
2124	* @param pPool The pool.
2125	* @param pPage The page.
2126	*/
2127	DECLINLINE(void) pgmPoolHashRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2128	{
2129	Log3(("pgmPoolHashRemove: %RGp\n", pPage->GCPhys));
2130	uint16_t iHash = PGMPOOL_HASH(pPage->GCPhys);
2131	if (pPool->aiHash[iHash] == pPage->idx)
2132	pPool->aiHash[iHash] = pPage->iNext;
2133	else
2134	{
2135	uint16_t iPrev = pPool->aiHash[iHash];
2136	for (;;)
2137	{
2138	const int16_t i = pPool->aPages[iPrev].iNext;
2139	if (i == pPage->idx)
2140	{
2141	pPool->aPages[iPrev].iNext = pPage->iNext;
2142	break;
2143	}
2144	if (i == NIL_PGMPOOL_IDX)
2145	{
2146	AssertReleaseMsgFailed(("GCPhys=%RGp idx=%d\n", pPage->GCPhys, pPage->idx));
2147	break;
2148	}
2149	iPrev = i;
2150	}
2151	}
2152	pPage->iNext = NIL_PGMPOOL_IDX;
2153	}
2154
2155
2156	/**
2157	* Frees up one cache page.
2158	*
2159	* @returns VBox status code.
2160	* @retval VINF_SUCCESS on success.
2161	* @param pPool The pool.
2162	* @param iUser The user index.
2163	*/
2164	static int pgmPoolCacheFreeOne(PPGMPOOL pPool, uint16_t iUser)
2165	{
2166	#ifndef VBOX_VMM_TARGET_ARMV8
2167	const PVMCC pVM = pPool->CTX_SUFF(pVM);
2168	#endif
2169	Assert(pPool->iAgeHead != pPool->iAgeTail); /* We shouldn't be here if there < 2 cached entries! */
2170	STAM_COUNTER_INC(&pPool->StatCacheFreeUpOne);
2171
2172	/*
2173	* Select one page from the tail of the age list.
2174	*/
2175	PPGMPOOLPAGE pPage;
2176	for (unsigned iLoop = 0; ; iLoop++)
2177	{
2178	uint16_t iToFree = pPool->iAgeTail;
2179	if (iToFree == iUser && iUser != NIL_PGMPOOL_IDX)
2180	iToFree = pPool->aPages[iToFree].iAgePrev;
2181	/* This is the alternative to the SyncCR3 pgmPoolCacheUsed calls.
2182	if (pPool->aPages[iToFree].iUserHead != NIL_PGMPOOL_USER_INDEX)
2183	{
2184	uint16_t i = pPool->aPages[iToFree].iAgePrev;
2185	for (unsigned j = 0; j < 10 && i != NIL_PGMPOOL_USER_INDEX; j++, i = pPool->aPages[i].iAgePrev)
2186	{
2187	if (pPool->aPages[iToFree].iUserHead == NIL_PGMPOOL_USER_INDEX)
2188	continue;
2189	iToFree = i;
2190	break;
2191	}
2192	}
2193	*/
2194	Assert(iToFree != iUser);
2195	AssertReleaseMsg(iToFree != NIL_PGMPOOL_IDX,
2196	("iToFree=%#x (iAgeTail=%#x) iUser=%#x iLoop=%u - pPool=%p LB %#zx\n",
2197	iToFree, pPool->iAgeTail, iUser, iLoop, pPool,
2198	RT_UOFFSETOF_DYN(PGMPOOL, aPages[pPool->cMaxPages])
2199	+ pPool->cMaxUsers * sizeof(PGMPOOLUSER)
2200	+ pPool->cMaxPhysExts * sizeof(PGMPOOLPHYSEXT) ));
2201
2202	pPage = &pPool->aPages[iToFree];
2203
2204	/*
2205	* Reject any attempts at flushing the currently active shadow CR3 mapping.
2206	* Call pgmPoolCacheUsed to move the page to the head of the age list.
2207	*/
2208	if ( !pgmPoolIsPageLocked(pPage)
2209	&& pPage->idx >= PGMPOOL_IDX_FIRST /* paranoia (#6349) */)
2210	break;
2211	LogFlow(("pgmPoolCacheFreeOne: refuse CR3 mapping\n"));
2212	pgmPoolCacheUsed(pPool, pPage);
2213	AssertLogRelReturn(iLoop < 8192, VERR_PGM_POOL_TOO_MANY_LOOPS);
2214	}
2215
2216	/*
2217	* Found a usable page, flush it and return.
2218	*/
2219	int rc = pgmPoolFlushPage(pPool, pPage);
2220	/* This flush was initiated by us and not the guest, so explicitly flush the TLB. */
2221	/** @todo find out why this is necessary; pgmPoolFlushPage should trigger a flush if one is really needed. */
2222	if (rc == VINF_SUCCESS)
2223	PGM_INVL_ALL_VCPU_TLBS(pVM);
2224	return rc;
2225	}
2226
2227
2228	/**
2229	* Checks if a kind mismatch is really a page being reused
2230	* or if it's just normal remappings.
2231	*
2232	* @returns true if reused and the cached page (enmKind1) should be flushed
2233	* @returns false if not reused.
2234	* @param enmKind1 The kind of the cached page.
2235	* @param enmKind2 The kind of the requested page.
2236	*/
2237	static bool pgmPoolCacheReusedByKind(PGMPOOLKIND enmKind1, PGMPOOLKIND enmKind2)
2238	{
2239	switch (enmKind1)
2240	{
2241	/*
2242	* Never reuse them. There is no remapping in non-paging mode.
2243	*/
2244	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2245	case PGMPOOLKIND_32BIT_PD_PHYS:
2246	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2247	case PGMPOOLKIND_PAE_PD_PHYS:
2248	case PGMPOOLKIND_PAE_PDPT_PHYS:
2249	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2250	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2251	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2252	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2253	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2254	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT: /* never reuse them for other types */
2255	return false;
2256
2257	/*
2258	* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
2259	*/
2260	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2261	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2262	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2263	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2264	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2265	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2266	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2267	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2268	case PGMPOOLKIND_32BIT_PD:
2269	case PGMPOOLKIND_PAE_PDPT:
2270	Assert(!PGMPOOL_PAGE_IS_KIND_NESTED(enmKind2));
2271	switch (enmKind2)
2272	{
2273	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2274	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2275	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2276	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2277	case PGMPOOLKIND_64BIT_PML4:
2278	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2279	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2280	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2281	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2282	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2283	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2284	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2285	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2286	return true;
2287	default:
2288	return false;
2289	}
2290
2291	/*
2292	* It's perfectly fine to reuse these, except for PAE and non-paging stuff.
2293	*/
2294	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2295	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2296	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2297	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2298	case PGMPOOLKIND_64BIT_PML4:
2299	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2300	Assert(!PGMPOOL_PAGE_IS_KIND_NESTED(enmKind2));
2301	switch (enmKind2)
2302	{
2303	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2304	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2305	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2306	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2307	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2308	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2309	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2310	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2311	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2312	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2313	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2314	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2315	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2316	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2317	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2318	return true;
2319	default:
2320	return false;
2321	}
2322
2323	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
2324	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
2325	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
2326	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
2327	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
2328	return PGMPOOL_PAGE_IS_KIND_NESTED(enmKind2);
2329
2330	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
2331	return false;
2332	#endif
2333
2334	/*
2335	* These cannot be flushed, and it's common to reuse the PDs as PTs.
2336	*/
2337	case PGMPOOLKIND_ROOT_NESTED:
2338	return false;
2339
2340	default:
2341	AssertFatalMsgFailed(("enmKind1=%d\n", enmKind1));
2342	}
2343	}
2344
2345
2346	/**
2347	* Attempts to satisfy a pgmPoolAlloc request from the cache.
2348	*
2349	* @returns VBox status code.
2350	* @retval VINF_PGM_CACHED_PAGE on success.
2351	* @retval VERR_FILE_NOT_FOUND if not found.
2352	* @param pPool The pool.
2353	* @param GCPhys The GC physical address of the page we're gonna shadow.
2354	* @param enmKind The kind of mapping.
2355	* @param enmAccess Access type for the mapping (only relevant for big pages)
2356	* @param fA20Enabled Whether the CPU has the A20 gate enabled.
2357	* @param iUser The shadow page pool index of the user table. This is
2358	* NIL_PGMPOOL_IDX for root pages.
2359	* @param iUserTable The index into the user table (shadowed). Ignored if
2360	* root page
2361	* @param ppPage Where to store the pointer to the page.
2362	*/
2363	static int pgmPoolCacheAlloc(PPGMPOOL pPool, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, bool fA20Enabled,
2364	uint16_t iUser, uint32_t iUserTable, PPPGMPOOLPAGE ppPage)
2365	{
2366	/*
2367	* Look up the GCPhys in the hash.
2368	*/
2369	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
2370	Log3(("pgmPoolCacheAlloc: %RGp kind %s iUser=%d iUserTable=%x SLOT=%d\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable, i));
2371	if (i != NIL_PGMPOOL_IDX)
2372	{
2373	do
2374	{
2375	PPGMPOOLPAGE pPage = &pPool->aPages[i];
2376	Log4(("pgmPoolCacheAlloc: slot %d found page %RGp\n", i, pPage->GCPhys));
2377	if (pPage->GCPhys == GCPhys)
2378	{
2379	if ( (PGMPOOLKIND)pPage->enmKind == enmKind
2380	&& (PGMPOOLACCESS)pPage->enmAccess == enmAccess
2381	&& pPage->fA20Enabled == fA20Enabled)
2382	{
2383	/* Put it at the start of the use list to make sure pgmPoolTrackAddUser
2384	* doesn't flush it in case there are no more free use records.
2385	*/
2386	pgmPoolCacheUsed(pPool, pPage);
2387
2388	int rc = VINF_SUCCESS;
2389	if (iUser != NIL_PGMPOOL_IDX)
2390	rc = pgmPoolTrackAddUser(pPool, pPage, iUser, iUserTable);
2391	if (RT_SUCCESS(rc))
2392	{
2393	Assert((PGMPOOLKIND)pPage->enmKind == enmKind);
2394	*ppPage = pPage;
2395	if (pPage->cModifications)
2396	pPage->cModifications = 1; /* reset counter (can't use 0, or else it will be reinserted in the modified list) */
2397	STAM_COUNTER_INC(&pPool->StatCacheHits);
2398	return VINF_PGM_CACHED_PAGE;
2399	}
2400	return rc;
2401	}
2402
2403	if ((PGMPOOLKIND)pPage->enmKind != enmKind)
2404	{
2405	/*
2406	* The kind is different. In some cases we should now flush the page
2407	* as it has been reused, but in most cases this is normal remapping
2408	* of PDs as PT or big pages using the GCPhys field in a slightly
2409	* different way than the other kinds.
2410	*/
2411	if (pgmPoolCacheReusedByKind((PGMPOOLKIND)pPage->enmKind, enmKind))
2412	{
2413	STAM_COUNTER_INC(&pPool->StatCacheKindMismatches);
2414	pgmPoolFlushPage(pPool, pPage);
2415	break;
2416	}
2417	}
2418	}
2419
2420	/* next */
2421	i = pPage->iNext;
2422	} while (i != NIL_PGMPOOL_IDX);
2423	}
2424
2425	Log3(("pgmPoolCacheAlloc: Missed GCPhys=%RGp enmKind=%s\n", GCPhys, pgmPoolPoolKindToStr(enmKind)));
2426	STAM_COUNTER_INC(&pPool->StatCacheMisses);
2427	return VERR_FILE_NOT_FOUND;
2428	}
2429
2430
2431	/**
2432	* Inserts a page into the cache.
2433	*
2434	* @param pPool The pool.
2435	* @param pPage The cached page.
2436	* @param fCanBeCached Set if the page is fit for caching from the caller's point of view.
2437	*/
2438	static void pgmPoolCacheInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fCanBeCached)
2439	{
2440	/*
2441	* Insert into the GCPhys hash if the page is fit for that.
2442	*/
2443	Assert(!pPage->fCached);
2444	if (fCanBeCached)
2445	{
2446	pPage->fCached = true;
2447	pgmPoolHashInsert(pPool, pPage);
2448	Log3(("pgmPoolCacheInsert: Caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
2449	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
2450	STAM_COUNTER_INC(&pPool->StatCacheCacheable);
2451	}
2452	else
2453	{
2454	Log3(("pgmPoolCacheInsert: Not caching %p:{.Core=%RHp, .idx=%d, .enmKind=%s, GCPhys=%RGp}\n",
2455	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
2456	STAM_COUNTER_INC(&pPool->StatCacheUncacheable);
2457	}
2458
2459	/*
2460	* Insert at the head of the age list.
2461	*/
2462	pPage->iAgePrev = NIL_PGMPOOL_IDX;
2463	pPage->iAgeNext = pPool->iAgeHead;
2464	if (pPool->iAgeHead != NIL_PGMPOOL_IDX)
2465	pPool->aPages[pPool->iAgeHead].iAgePrev = pPage->idx;
2466	else
2467	pPool->iAgeTail = pPage->idx;
2468	pPool->iAgeHead = pPage->idx;
2469	}
2470
2471
2472	/**
2473	* Flushes a cached page.
2474	*
2475	* @param pPool The pool.
2476	* @param pPage The cached page.
2477	*/
2478	static void pgmPoolCacheFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2479	{
2480	Log3(("pgmPoolCacheFlushPage: %RGp\n", pPage->GCPhys));
2481
2482	/*
2483	* Remove the page from the hash.
2484	*/
2485	if (pPage->fCached)
2486	{
2487	pPage->fCached = false;
2488	pgmPoolHashRemove(pPool, pPage);
2489	}
2490	else
2491	Assert(pPage->iNext == NIL_PGMPOOL_IDX);
2492
2493	/*
2494	* Remove it from the age list.
2495	*/
2496	if (pPage->iAgeNext != NIL_PGMPOOL_IDX)
2497	pPool->aPages[pPage->iAgeNext].iAgePrev = pPage->iAgePrev;
2498	else
2499	pPool->iAgeTail = pPage->iAgePrev;
2500	if (pPage->iAgePrev != NIL_PGMPOOL_IDX)
2501	pPool->aPages[pPage->iAgePrev].iAgeNext = pPage->iAgeNext;
2502	else
2503	pPool->iAgeHead = pPage->iAgeNext;
2504	pPage->iAgeNext = NIL_PGMPOOL_IDX;
2505	pPage->iAgePrev = NIL_PGMPOOL_IDX;
2506	}
2507
2508
2509	/**
2510	* Looks for pages sharing the monitor.
2511	*
2512	* @returns Pointer to the head page.
2513	* @returns NULL if not found.
2514	* @param pPool The Pool
2515	* @param pNewPage The page which is going to be monitored.
2516	*/
2517	static PPGMPOOLPAGE pgmPoolMonitorGetPageByGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pNewPage)
2518	{
2519	/*
2520	* Look up the GCPhys in the hash.
2521	*/
2522	RTGCPHYS GCPhys = pNewPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2523	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
2524	if (i == NIL_PGMPOOL_IDX)
2525	return NULL;
2526	do
2527	{
2528	PPGMPOOLPAGE pPage = &pPool->aPages[i];
2529	if ( pPage->GCPhys - GCPhys < PAGE_SIZE
2530	&& pPage != pNewPage)
2531	{
2532	switch (pPage->enmKind)
2533	{
2534	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2535	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2536	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2537	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2538	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2539	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2540	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2541	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2542	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2543	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2544	case PGMPOOLKIND_64BIT_PML4:
2545	case PGMPOOLKIND_32BIT_PD:
2546	case PGMPOOLKIND_PAE_PDPT:
2547	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
2548	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
2549	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
2550	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
2551	#endif
2552	{
2553	/* find the head */
2554	while (pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
2555	{
2556	Assert(pPage->iMonitoredPrev != pPage->idx);
2557	pPage = &pPool->aPages[pPage->iMonitoredPrev];
2558	}
2559	return pPage;
2560	}
2561
2562	/* ignore, no monitoring. */
2563	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2564	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2565	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2566	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2567	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2568	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2569	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2570	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2571	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2572	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2573	case PGMPOOLKIND_ROOT_NESTED:
2574	case PGMPOOLKIND_PAE_PD_PHYS:
2575	case PGMPOOLKIND_PAE_PDPT_PHYS:
2576	case PGMPOOLKIND_32BIT_PD_PHYS:
2577	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
2578	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
2579	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
2580	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
2581	#endif
2582	break;
2583	default:
2584	AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
2585	}
2586	}
2587
2588	/* next */
2589	i = pPage->iNext;
2590	} while (i != NIL_PGMPOOL_IDX);
2591	return NULL;
2592	}
2593
2594
2595	/**
2596	* Enabled write monitoring of a guest page.
2597	*
2598	* @returns VBox status code.
2599	* @retval VINF_SUCCESS on success.
2600	* @param pPool The pool.
2601	* @param pPage The cached page.
2602	*/
2603	static int pgmPoolMonitorInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2604	{
2605	LogFlow(("pgmPoolMonitorInsert %RGp\n", pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK));
2606
2607	/*
2608	* Filter out the relevant kinds.
2609	*/
2610	switch (pPage->enmKind)
2611	{
2612	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2613	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2614	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2615	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2616	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2617	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2618	case PGMPOOLKIND_64BIT_PML4:
2619	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2620	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2621	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2622	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2623	case PGMPOOLKIND_32BIT_PD:
2624	case PGMPOOLKIND_PAE_PDPT:
2625	break;
2626
2627	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2628	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2629	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2630	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2631	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2632	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2633	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2634	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2635	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2636	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2637	case PGMPOOLKIND_ROOT_NESTED:
2638	/* Nothing to monitor here. */
2639	return VINF_SUCCESS;
2640
2641	case PGMPOOLKIND_32BIT_PD_PHYS:
2642	case PGMPOOLKIND_PAE_PDPT_PHYS:
2643	case PGMPOOLKIND_PAE_PD_PHYS:
2644	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
2645	/* Nothing to monitor here. */
2646	return VINF_SUCCESS;
2647
2648	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
2649	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
2650	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
2651	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
2652	break;
2653
2654	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
2655	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
2656	/* Nothing to monitor here. */
2657	return VINF_SUCCESS;
2658	#endif
2659
2660	default:
2661	AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
2662	}
2663
2664	/*
2665	* Install handler.
2666	*/
2667	int rc;
2668	PPGMPOOLPAGE pPageHead = pgmPoolMonitorGetPageByGCPhys(pPool, pPage);
2669	if (pPageHead)
2670	{
2671	Assert(pPageHead != pPage); Assert(pPageHead->iMonitoredNext != pPage->idx);
2672	Assert(pPageHead->iMonitoredPrev != pPage->idx);
2673
2674	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
2675	if (pPageHead->fDirty)
2676	pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPageHead->idxDirtyEntry, false /* do not remove */);
2677	#endif
2678
2679	pPage->iMonitoredPrev = pPageHead->idx;
2680	pPage->iMonitoredNext = pPageHead->iMonitoredNext;
2681	if (pPageHead->iMonitoredNext != NIL_PGMPOOL_IDX)
2682	pPool->aPages[pPageHead->iMonitoredNext].iMonitoredPrev = pPage->idx;
2683	pPageHead->iMonitoredNext = pPage->idx;
2684	rc = VINF_SUCCESS;
2685	if (PGMPOOL_PAGE_IS_NESTED(pPage))
2686	Log7Func(("Adding to monitoring list GCPhysPage=%RGp\n", pPage->GCPhys));
2687	}
2688	else
2689	{
2690	if (PGMPOOL_PAGE_IS_NESTED(pPage))
2691	Log7Func(("Started monitoring GCPhysPage=%RGp HCPhys=%RHp enmKind=%s\n", pPage->GCPhys, pPage->Core.Key, pgmPoolPoolKindToStr(pPage->enmKind)));
2692
2693	Assert(pPage->iMonitoredNext == NIL_PGMPOOL_IDX); Assert(pPage->iMonitoredPrev == NIL_PGMPOOL_IDX);
2694	PVMCC pVM = pPool->CTX_SUFF(pVM);
2695	const RTGCPHYS GCPhysPage = pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
2696	rc = PGMHandlerPhysicalRegister(pVM, GCPhysPage, GCPhysPage + PAGE_OFFSET_MASK, pPool->hAccessHandlerType,
2697	pPage - &pPool->aPages[0], NIL_RTR3PTR /pszDesc/);
2698	/** @todo we should probably deal with out-of-memory conditions here, but for now increasing
2699	* the heap size should suffice. */
2700	AssertFatalMsgRC(rc, ("PGMHandlerPhysicalRegisterEx %RGp failed with %Rrc\n", GCPhysPage, rc));
2701	PVMCPU pVCpu = VMMGetCpu(pVM);
2702	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)));
2703	}
2704	pPage->fMonitored = true;
2705	return rc;
2706	}
2707
2708
2709	/**
2710	* Disables write monitoring of a guest page.
2711	*
2712	* @returns VBox status code.
2713	* @retval VINF_SUCCESS on success.
2714	* @param pPool The pool.
2715	* @param pPage The cached page.
2716	*/
2717	static int pgmPoolMonitorFlush(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2718	{
2719	/*
2720	* Filter out the relevant kinds.
2721	*/
2722	switch (pPage->enmKind)
2723	{
2724	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
2725	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
2726	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
2727	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
2728	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
2729	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
2730	case PGMPOOLKIND_64BIT_PML4:
2731	case PGMPOOLKIND_32BIT_PD:
2732	case PGMPOOLKIND_PAE_PDPT:
2733	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
2734	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
2735	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
2736	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
2737	break;
2738
2739	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
2740	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
2741	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
2742	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
2743	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
2744	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
2745	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
2746	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
2747	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
2748	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
2749	case PGMPOOLKIND_ROOT_NESTED:
2750	case PGMPOOLKIND_PAE_PD_PHYS:
2751	case PGMPOOLKIND_PAE_PDPT_PHYS:
2752	case PGMPOOLKIND_32BIT_PD_PHYS:
2753	/* Nothing to monitor here. */
2754	Assert(!pPage->fMonitored);
2755	return VINF_SUCCESS;
2756
2757	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
2758	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
2759	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
2760	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
2761	break;
2762
2763	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
2764	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
2765	/* Nothing to monitor here. */
2766	Assert(!pPage->fMonitored);
2767	return VINF_SUCCESS;
2768	#endif
2769
2770	default:
2771	AssertFatalMsgFailed(("This can't happen! enmKind=%d\n", pPage->enmKind));
2772	}
2773	Assert(pPage->fMonitored);
2774
2775	/*
2776	* Remove the page from the monitored list or uninstall it if last.
2777	*/
2778	const PVMCC pVM = pPool->CTX_SUFF(pVM);
2779	int rc;
2780	if ( pPage->iMonitoredNext != NIL_PGMPOOL_IDX
2781	\|\| pPage->iMonitoredPrev != NIL_PGMPOOL_IDX)
2782	{
2783	if (pPage->iMonitoredPrev == NIL_PGMPOOL_IDX)
2784	{
2785	PPGMPOOLPAGE pNewHead = &pPool->aPages[pPage->iMonitoredNext];
2786	pNewHead->iMonitoredPrev = NIL_PGMPOOL_IDX;
2787	rc = PGMHandlerPhysicalChangeUserArg(pVM, pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK, pPage->iMonitoredNext);
2788
2789	AssertFatalRCSuccess(rc);
2790	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
2791	}
2792	else
2793	{
2794	pPool->aPages[pPage->iMonitoredPrev].iMonitoredNext = pPage->iMonitoredNext;
2795	if (pPage->iMonitoredNext != NIL_PGMPOOL_IDX)
2796	{
2797	pPool->aPages[pPage->iMonitoredNext].iMonitoredPrev = pPage->iMonitoredPrev;
2798	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
2799	}
2800	pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
2801	rc = VINF_SUCCESS;
2802	}
2803	}
2804	else
2805	{
2806	rc = PGMHandlerPhysicalDeregister(pVM, pPage->GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK);
2807	AssertFatalRC(rc);
2808	PVMCPU pVCpu = VMMGetCpu(pVM);
2809	AssertFatalMsg(!(pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL) \|\| VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3),
2810	("%#x %#x\n", pVCpu->pgm.s.fSyncFlags, pVM->fGlobalForcedActions));
2811	}
2812	pPage->fMonitored = false;
2813
2814	/*
2815	* Remove it from the list of modified pages (if in it).
2816	*/
2817	pgmPoolMonitorModifiedRemove(pPool, pPage);
2818
2819	if (PGMPOOL_PAGE_IS_NESTED(pPage))
2820	Log7Func(("Stopped monitoring %RGp\n", pPage->GCPhys));
2821
2822	return rc;
2823	}
2824
2825
2826	/**
2827	* Inserts the page into the list of modified pages.
2828	*
2829	* @param pPool The pool.
2830	* @param pPage The page.
2831	*/
2832	void pgmPoolMonitorModifiedInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2833	{
2834	Log3(("pgmPoolMonitorModifiedInsert: idx=%d\n", pPage->idx));
2835	AssertMsg( pPage->iModifiedNext == NIL_PGMPOOL_IDX
2836	&& pPage->iModifiedPrev == NIL_PGMPOOL_IDX
2837	&& pPool->iModifiedHead != pPage->idx,
2838	("Next=%d Prev=%d idx=%d cModifications=%d Head=%d cModifiedPages=%d\n",
2839	pPage->iModifiedNext, pPage->iModifiedPrev, pPage->idx, pPage->cModifications,
2840	pPool->iModifiedHead, pPool->cModifiedPages));
2841
2842	pPage->iModifiedNext = pPool->iModifiedHead;
2843	if (pPool->iModifiedHead != NIL_PGMPOOL_IDX)
2844	pPool->aPages[pPool->iModifiedHead].iModifiedPrev = pPage->idx;
2845	pPool->iModifiedHead = pPage->idx;
2846	pPool->cModifiedPages++;
2847	#ifdef VBOX_WITH_STATISTICS
2848	if (pPool->cModifiedPages > pPool->cModifiedPagesHigh)
2849	pPool->cModifiedPagesHigh = pPool->cModifiedPages;
2850	#endif
2851	}
2852
2853
2854	/**
2855	* Removes the page from the list of modified pages and resets the
2856	* modification counter.
2857	*
2858	* @param pPool The pool.
2859	* @param pPage The page which is believed to be in the list of modified pages.
2860	*/
2861	static void pgmPoolMonitorModifiedRemove(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
2862	{
2863	Log3(("pgmPoolMonitorModifiedRemove: idx=%d cModifications=%d\n", pPage->idx, pPage->cModifications));
2864	if (pPool->iModifiedHead == pPage->idx)
2865	{
2866	Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
2867	pPool->iModifiedHead = pPage->iModifiedNext;
2868	if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
2869	{
2870	pPool->aPages[pPage->iModifiedNext].iModifiedPrev = NIL_PGMPOOL_IDX;
2871	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2872	}
2873	pPool->cModifiedPages--;
2874	}
2875	else if (pPage->iModifiedPrev != NIL_PGMPOOL_IDX)
2876	{
2877	pPool->aPages[pPage->iModifiedPrev].iModifiedNext = pPage->iModifiedNext;
2878	if (pPage->iModifiedNext != NIL_PGMPOOL_IDX)
2879	{
2880	pPool->aPages[pPage->iModifiedNext].iModifiedPrev = pPage->iModifiedPrev;
2881	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2882	}
2883	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
2884	pPool->cModifiedPages--;
2885	}
2886	else
2887	Assert(pPage->iModifiedPrev == NIL_PGMPOOL_IDX);
2888	pPage->cModifications = 0;
2889	}
2890
2891
2892	/**
2893	* Zaps the list of modified pages, resetting their modification counters in the process.
2894	*
2895	* @param pVM The cross context VM structure.
2896	*/
2897	static void pgmPoolMonitorModifiedClearAll(PVMCC pVM)
2898	{
2899	PGM_LOCK_VOID(pVM);
2900	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
2901	LogFlow(("pgmPoolMonitorModifiedClearAll: cModifiedPages=%d\n", pPool->cModifiedPages));
2902
2903	unsigned cPages = 0; NOREF(cPages);
2904
2905	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
2906	pgmPoolResetDirtyPages(pVM);
2907	#endif
2908
2909	uint16_t idx = pPool->iModifiedHead;
2910	pPool->iModifiedHead = NIL_PGMPOOL_IDX;
2911	while (idx != NIL_PGMPOOL_IDX)
2912	{
2913	PPGMPOOLPAGE pPage = &pPool->aPages[idx];
2914	idx = pPage->iModifiedNext;
2915	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
2916	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
2917	pPage->cModifications = 0;
2918	Assert(++cPages);
2919	}
2920	AssertMsg(cPages == pPool->cModifiedPages, ("%d != %d\n", cPages, pPool->cModifiedPages));
2921	pPool->cModifiedPages = 0;
2922	PGM_UNLOCK(pVM);
2923	}
2924
2925
2926	/**
2927	* Handle SyncCR3 pool tasks
2928	*
2929	* @returns VBox status code.
2930	* @retval VINF_SUCCESS if successfully added.
2931	* @retval VINF_PGM_SYNC_CR3 is it needs to be deferred to ring 3 (GC only)
2932	* @param pVCpu The cross context virtual CPU structure.
2933	* @remark Should only be used when monitoring is available, thus placed in
2934	* the PGMPOOL_WITH_MONITORING \#ifdef.
2935	*/
2936	int pgmPoolSyncCR3(PVMCPUCC pVCpu)
2937	{
2938	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
2939	LogFlow(("pgmPoolSyncCR3 fSyncFlags=%x\n", pVCpu->pgm.s.fSyncFlags));
2940
2941	/*
2942	* When monitoring shadowed pages, we reset the modification counters on CR3 sync.
2943	* Occasionally we will have to clear all the shadow page tables because we wanted
2944	* to monitor a page which was mapped by too many shadowed page tables. This operation
2945	* sometimes referred to as a 'lightweight flush'.
2946	*/
2947	# ifdef IN_RING3 /* Don't flush in ring-0 or raw mode, it's taking too long. */
2948	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2949	pgmR3PoolClearAll(pVM, false /fFlushRemTlb/);
2950	# else /* !IN_RING3 */
2951	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2952	{
2953	Log(("SyncCR3: PGM_SYNC_CLEAR_PGM_POOL is set -> VINF_PGM_SYNC_CR3\n"));
2954	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3); /** @todo no need to do global sync, right? */
2955
2956	/* Make sure all other VCPUs return to ring 3. */
2957	if (pVM->cCpus > 1)
2958	{
2959	VM_FF_SET(pVM, VM_FF_PGM_POOL_FLUSH_PENDING);
2960	PGM_INVL_ALL_VCPU_TLBS(pVM);
2961	}
2962	return VINF_PGM_SYNC_CR3;
2963	}
2964	# endif /* !IN_RING3 */
2965	else
2966	{
2967	pgmPoolMonitorModifiedClearAll(pVM);
2968
2969	/* pgmPoolMonitorModifiedClearAll can cause a pgm pool flush (dirty page clearing), so make sure we handle this! */
2970	if (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)
2971	{
2972	Log(("pgmPoolMonitorModifiedClearAll caused a pgm flush -> call pgmPoolSyncCR3 again!\n"));
2973	return pgmPoolSyncCR3(pVCpu);
2974	}
2975	}
2976	return VINF_SUCCESS;
2977	}
2978
2979
2980	/**
2981	* Frees up at least one user entry.
2982	*
2983	* @returns VBox status code.
2984	* @retval VINF_SUCCESS if successfully added.
2985	*
2986	* @param pPool The pool.
2987	* @param iUser The user index.
2988	*/
2989	static int pgmPoolTrackFreeOneUser(PPGMPOOL pPool, uint16_t iUser)
2990	{
2991	STAM_COUNTER_INC(&pPool->StatTrackFreeUpOneUser);
2992	/*
2993	* Just free cached pages in a braindead fashion.
2994	*/
2995	/** @todo walk the age list backwards and free the first with usage. */
2996	int rc = VINF_SUCCESS;
2997	do
2998	{
2999	int rc2 = pgmPoolCacheFreeOne(pPool, iUser);
3000	if (RT_FAILURE(rc2) && rc == VINF_SUCCESS)
3001	rc = rc2;
3002	} while (pPool->iUserFreeHead == NIL_PGMPOOL_USER_INDEX);
3003	return rc;
3004	}
3005
3006
3007	/**
3008	* Inserts a page into the cache.
3009	*
3010	* This will create user node for the page, insert it into the GCPhys
3011	* hash, and insert it into the age list.
3012	*
3013	* @returns VBox status code.
3014	* @retval VINF_SUCCESS if successfully added.
3015	*
3016	* @param pPool The pool.
3017	* @param pPage The cached page.
3018	* @param GCPhys The GC physical address of the page we're gonna shadow.
3019	* @param iUser The user index.
3020	* @param iUserTable The user table index.
3021	*/
3022	DECLINLINE(int) pgmPoolTrackInsert(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTGCPHYS GCPhys, uint16_t iUser, uint32_t iUserTable)
3023	{
3024	int rc = VINF_SUCCESS;
3025	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
3026
3027	LogFlow(("pgmPoolTrackInsert GCPhys=%RGp iUser=%d iUserTable=%x\n", GCPhys, iUser, iUserTable)); RT_NOREF_PV(GCPhys);
3028
3029	if (iUser != NIL_PGMPOOL_IDX)
3030	{
3031	#ifdef VBOX_STRICT
3032	/*
3033	* Check that the entry doesn't already exists.
3034	*/
3035	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
3036	{
3037	uint16_t i = pPage->iUserHead;
3038	do
3039	{
3040	Assert(i < pPool->cMaxUsers);
3041	AssertMsg(paUsers[i].iUser != iUser \|\| paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
3042	i = paUsers[i].iNext;
3043	} while (i != NIL_PGMPOOL_USER_INDEX);
3044	}
3045	#endif
3046
3047	/*
3048	* Find free a user node.
3049	*/
3050	uint16_t i = pPool->iUserFreeHead;
3051	if (i == NIL_PGMPOOL_USER_INDEX)
3052	{
3053	rc = pgmPoolTrackFreeOneUser(pPool, iUser);
3054	if (RT_FAILURE(rc))
3055	return rc;
3056	i = pPool->iUserFreeHead;
3057	}
3058
3059	/*
3060	* Unlink the user node from the free list,
3061	* initialize and insert it into the user list.
3062	*/
3063	pPool->iUserFreeHead = paUsers[i].iNext;
3064	paUsers[i].iNext = NIL_PGMPOOL_USER_INDEX;
3065	paUsers[i].iUser = iUser;
3066	paUsers[i].iUserTable = iUserTable;
3067	pPage->iUserHead = i;
3068	}
3069	else
3070	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
3071
3072
3073	/*
3074	* Insert into cache and enable monitoring of the guest page if enabled.
3075	*
3076	* Until we implement caching of all levels, including the CR3 one, we'll
3077	* have to make sure we don't try monitor & cache any recursive reuse of
3078	* a monitored CR3 page. Because all windows versions are doing this we'll
3079	* have to be able to do combined access monitoring, CR3 + PT and
3080	* PD + PT (guest PAE).
3081	*
3082	* Update:
3083	* We're now cooperating with the CR3 monitor if an uncachable page is found.
3084	*/
3085	const bool fCanBeMonitored = true;
3086	pgmPoolCacheInsert(pPool, pPage, fCanBeMonitored); /* This can be expanded. */
3087	if (fCanBeMonitored)
3088	{
3089	rc = pgmPoolMonitorInsert(pPool, pPage);
3090	AssertRC(rc);
3091	}
3092	return rc;
3093	}
3094
3095
3096	/**
3097	* Adds a user reference to a page.
3098	*
3099	* This will move the page to the head of the
3100	*
3101	* @returns VBox status code.
3102	* @retval VINF_SUCCESS if successfully added.
3103	*
3104	* @param pPool The pool.
3105	* @param pPage The cached page.
3106	* @param iUser The user index.
3107	* @param iUserTable The user table.
3108	*/
3109	static int pgmPoolTrackAddUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
3110	{
3111	Log3(("pgmPoolTrackAddUser: GCPhys=%RGp iUser=%x iUserTable=%x\n", pPage->GCPhys, iUser, iUserTable));
3112	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
3113	Assert(iUser != NIL_PGMPOOL_IDX);
3114
3115	# ifdef VBOX_STRICT
3116	/*
3117	* Check that the entry doesn't already exists. We only allow multiple
3118	* users of top-level paging structures (SHW_POOL_ROOT_IDX).
3119	*/
3120	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
3121	{
3122	uint16_t i = pPage->iUserHead;
3123	do
3124	{
3125	Assert(i < pPool->cMaxUsers);
3126	/** @todo this assertion looks odd... Shouldn't it be && here? */
3127	AssertMsg(paUsers[i].iUser != iUser \|\| paUsers[i].iUserTable != iUserTable, ("%x %x vs new %x %x\n", paUsers[i].iUser, paUsers[i].iUserTable, iUser, iUserTable));
3128	i = paUsers[i].iNext;
3129	} while (i != NIL_PGMPOOL_USER_INDEX);
3130	}
3131	# endif
3132
3133	/*
3134	* Allocate a user node.
3135	*/
3136	uint16_t i = pPool->iUserFreeHead;
3137	if (i == NIL_PGMPOOL_USER_INDEX)
3138	{
3139	int rc = pgmPoolTrackFreeOneUser(pPool, iUser);
3140	if (RT_FAILURE(rc))
3141	return rc;
3142	i = pPool->iUserFreeHead;
3143	}
3144	pPool->iUserFreeHead = paUsers[i].iNext;
3145
3146	/*
3147	* Initialize the user node and insert it.
3148	*/
3149	paUsers[i].iNext = pPage->iUserHead;
3150	paUsers[i].iUser = iUser;
3151	paUsers[i].iUserTable = iUserTable;
3152	pPage->iUserHead = i;
3153
3154	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
3155	if (pPage->fDirty)
3156	pgmPoolFlushDirtyPage(pPool->CTX_SUFF(pVM), pPool, pPage->idxDirtyEntry, false /* do not remove */);
3157	# endif
3158
3159	/*
3160	* Tell the cache to update its replacement stats for this page.
3161	*/
3162	pgmPoolCacheUsed(pPool, pPage);
3163	return VINF_SUCCESS;
3164	}
3165
3166
3167	/**
3168	* Frees a user record associated with a page.
3169	*
3170	* This does not clear the entry in the user table, it simply replaces the
3171	* user record to the chain of free records.
3172	*
3173	* @param pPool The pool.
3174	* @param pPage The shadow page.
3175	* @param iUser The shadow page pool index of the user table.
3176	* @param iUserTable The index into the user table (shadowed).
3177	*
3178	* @remarks Don't call this for root pages.
3179	*/
3180	static void pgmPoolTrackFreeUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
3181	{
3182	Log3(("pgmPoolTrackFreeUser %RGp %x %x\n", pPage->GCPhys, iUser, iUserTable));
3183	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
3184	Assert(iUser != NIL_PGMPOOL_IDX);
3185
3186	/*
3187	* Unlink and free the specified user entry.
3188	*/
3189
3190	/* Special: For PAE and 32-bit paging, there is usually no more than one user. */
3191	uint16_t i = pPage->iUserHead;
3192	if ( i != NIL_PGMPOOL_USER_INDEX
3193	&& paUsers[i].iUser == iUser
3194	&& paUsers[i].iUserTable == iUserTable)
3195	{
3196	pPage->iUserHead = paUsers[i].iNext;
3197
3198	paUsers[i].iUser = NIL_PGMPOOL_IDX;
3199	paUsers[i].iNext = pPool->iUserFreeHead;
3200	pPool->iUserFreeHead = i;
3201	return;
3202	}
3203
3204	/* General: Linear search. */
3205	uint16_t iPrev = NIL_PGMPOOL_USER_INDEX;
3206	while (i != NIL_PGMPOOL_USER_INDEX)
3207	{
3208	if ( paUsers[i].iUser == iUser
3209	&& paUsers[i].iUserTable == iUserTable)
3210	{
3211	if (iPrev != NIL_PGMPOOL_USER_INDEX)
3212	paUsers[iPrev].iNext = paUsers[i].iNext;
3213	else
3214	pPage->iUserHead = paUsers[i].iNext;
3215
3216	paUsers[i].iUser = NIL_PGMPOOL_IDX;
3217	paUsers[i].iNext = pPool->iUserFreeHead;
3218	pPool->iUserFreeHead = i;
3219	return;
3220	}
3221	iPrev = i;
3222	i = paUsers[i].iNext;
3223	}
3224
3225	/* Fatal: didn't find it */
3226	AssertFatalMsgFailed(("Didn't find the user entry! iUser=%d iUserTable=%#x GCPhys=%RGp\n",
3227	iUser, iUserTable, pPage->GCPhys));
3228	}
3229
3230
3231	#if 0 /* unused */
3232	/**
3233	* Gets the entry size of a shadow table.
3234	*
3235	* @param enmKind The kind of page.
3236	*
3237	* @returns The size of the entry in bytes. That is, 4 or 8.
3238	* @returns If the kind is not for a table, an assertion is raised and 0 is
3239	* returned.
3240	*/
3241	DECLINLINE(unsigned) pgmPoolTrackGetShadowEntrySize(PGMPOOLKIND enmKind)
3242	{
3243	switch (enmKind)
3244	{
3245	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3246	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3247	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3248	case PGMPOOLKIND_32BIT_PD:
3249	case PGMPOOLKIND_32BIT_PD_PHYS:
3250	return 4;
3251
3252	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3253	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3254	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3255	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3256	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3257	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3258	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3259	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3260	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3261	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3262	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3263	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3264	case PGMPOOLKIND_64BIT_PML4:
3265	case PGMPOOLKIND_PAE_PDPT:
3266	case PGMPOOLKIND_ROOT_NESTED:
3267	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3268	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3269	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
3270	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3271	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3272	case PGMPOOLKIND_PAE_PD_PHYS:
3273	case PGMPOOLKIND_PAE_PDPT_PHYS:
3274	return 8;
3275
3276	default:
3277	AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
3278	}
3279	}
3280	#endif /* unused */
3281
3282	#if 0 /* unused */
3283	/**
3284	* Gets the entry size of a guest table.
3285	*
3286	* @param enmKind The kind of page.
3287	*
3288	* @returns The size of the entry in bytes. That is, 0, 4 or 8.
3289	* @returns If the kind is not for a table, an assertion is raised and 0 is
3290	* returned.
3291	*/
3292	DECLINLINE(unsigned) pgmPoolTrackGetGuestEntrySize(PGMPOOLKIND enmKind)
3293	{
3294	switch (enmKind)
3295	{
3296	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3297	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3298	case PGMPOOLKIND_32BIT_PD:
3299	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3300	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3301	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3302	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3303	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
3304	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
3305	return 4;
3306
3307	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3308	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3309	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
3310	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
3311	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
3312	case PGMPOOLKIND_64BIT_PML4:
3313	case PGMPOOLKIND_PAE_PDPT:
3314	return 8;
3315
3316	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3317	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3318	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
3319	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
3320	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
3321	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3322	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3323	case PGMPOOLKIND_ROOT_NESTED:
3324	case PGMPOOLKIND_PAE_PD_PHYS:
3325	case PGMPOOLKIND_PAE_PDPT_PHYS:
3326	case PGMPOOLKIND_32BIT_PD_PHYS:
3327	/** @todo can we return 0? (nobody is calling this...) */
3328	AssertFailed();
3329	return 0;
3330
3331	default:
3332	AssertFatalMsgFailed(("enmKind=%d\n", enmKind));
3333	}
3334	}
3335	#endif /* unused */
3336
3337
3338	/**
3339	* Checks one shadow page table entry for a mapping of a physical page.
3340	*
3341	* @returns true / false indicating removal of all relevant PTEs
3342	*
3343	* @param pVM The cross context VM structure.
3344	* @param pPhysPage The guest page in question.
3345	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3346	* @param iShw The shadow page table.
3347	* @param iPte Page table entry or NIL_PGMPOOL_PHYSEXT_IDX_PTE if unknown
3348	*/
3349	static bool pgmPoolTrackFlushGCPhysPTInt(PVM pVM, PCPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw, uint16_t iPte)
3350	{
3351	LogFlow(("pgmPoolTrackFlushGCPhysPTInt: pPhysPage=%RHp iShw=%d iPte=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw, iPte));
3352	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3353	bool fRet = false;
3354
3355	/*
3356	* Assert sanity.
3357	*/
3358	Assert(iPte != NIL_PGMPOOL_PHYSEXT_IDX_PTE);
3359	AssertFatalMsg(iShw < pPool->cCurPages && iShw != NIL_PGMPOOL_IDX, ("iShw=%d\n", iShw));
3360	PPGMPOOLPAGE pPage = &pPool->aPages[iShw];
3361
3362	/*
3363	* Then, clear the actual mappings to the page in the shadow PT.
3364	*/
3365	switch (pPage->enmKind)
3366	{
3367	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3368	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3369	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3370	{
3371	const uint32_t u32 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PTE_P;
3372	PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3373	uint32_t u32AndMask = 0;
3374	uint32_t u32OrMask = 0;
3375
3376	if (!fFlushPTEs)
3377	{
3378	/* Note! Disregarding the PGMPHYSHANDLER_F_NOT_IN_HM bit here. Should be harmless. */
3379	switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
3380	{
3381	case PGM_PAGE_HNDL_PHYS_STATE_NONE: /* No handler installed. */
3382	case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /* Monitoring is temporarily disabled. */
3383	u32OrMask = X86_PTE_RW;
3384	u32AndMask = UINT32_MAX;
3385	fRet = true;
3386	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3387	break;
3388
3389	case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /* Write access is monitored. */
3390	u32OrMask = 0;
3391	u32AndMask = ~X86_PTE_RW;
3392	fRet = true;
3393	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3394	break;
3395	default:
3396	/* We will end up here when called with an "ALL" access handler. */
3397	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3398	break;
3399	}
3400	}
3401	else
3402	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3403
3404	/* Update the counter if we're removing references. */
3405	if (!u32AndMask)
3406	{
3407	Assert(pPage->cPresent);
3408	Assert(pPool->cPresent);
3409	pPage->cPresent--;
3410	pPool->cPresent--;
3411	}
3412
3413	if ((pPT->a[iPte].u & (X86_PTE_PG_MASK \| X86_PTE_P)) == u32)
3414	{
3415	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX32\n", iPte, pPT->a[iPte]));
3416	X86PTE Pte;
3417	Pte.u = (pPT->a[iPte].u & u32AndMask) \| u32OrMask;
3418	if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
3419	Pte.u &= ~(X86PGUINT)X86_PTE_RW; /* need to disallow writes when dirty bit tracking is still active. */
3420
3421	ASMAtomicWriteU32(&pPT->a[iPte].u, Pte.u);
3422	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3423	return fRet;
3424	}
3425	#ifdef LOG_ENABLED
3426	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3427	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPT->a); i++)
3428	if ((pPT->a[i].u & (X86_PTE_PG_MASK \| X86_PTE_P)) == u32)
3429	{
3430	Log(("i=%d cFound=%d\n", i, ++cFound));
3431	}
3432	#endif
3433	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d u32=%RX32 poolkind=%x\n", pPage->iFirstPresent, pPage->cPresent, u32, pPage->enmKind));
3434	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);/
3435	break;
3436	}
3437
3438	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3439	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3440	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3441	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3442	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3443	case PGMPOOLKIND_EPT_PT_FOR_PHYS: /* physical mask the same as PAE; RW bit as well; be careful! */
3444	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
3445	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
3446	# ifdef PGM_WITH_LARGE_PAGES
3447	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
3448	# endif
3449	#endif
3450	{
3451	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PTE_P;
3452	PPGMSHWPTPAE pPT = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3453	uint64_t u64OrMask = 0;
3454	uint64_t u64AndMask = 0;
3455
3456	if (!fFlushPTEs)
3457	{
3458	/* Note! Disregarding the PGMPHYSHANDLER_F_NOT_IN_HM bit here. Should be harmless. */
3459	switch (PGM_PAGE_GET_HNDL_PHYS_STATE(pPhysPage))
3460	{
3461	case PGM_PAGE_HNDL_PHYS_STATE_NONE: /* No handler installed. */
3462	case PGM_PAGE_HNDL_PHYS_STATE_DISABLED: /* Monitoring is temporarily disabled. */
3463	u64OrMask = X86_PTE_RW;
3464	u64AndMask = UINT64_MAX;
3465	fRet = true;
3466	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3467	break;
3468
3469	case PGM_PAGE_HNDL_PHYS_STATE_WRITE: /* Write access is monitored. */
3470	u64OrMask = 0;
3471	u64AndMask = ~(uint64_t)X86_PTE_RW;
3472	fRet = true;
3473	STAM_COUNTER_INC(&pPool->StatTrackFlushEntryKeep);
3474	break;
3475
3476	default:
3477	/* We will end up here when called with an "ALL" access handler. */
3478	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3479	break;
3480	}
3481	}
3482	else
3483	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3484
3485	/* Update the counter if we're removing references. */
3486	if (!u64AndMask)
3487	{
3488	Assert(pPage->cPresent);
3489	Assert(pPool->cPresent);
3490	pPage->cPresent--;
3491	pPool->cPresent--;
3492	}
3493
3494	if ((PGMSHWPTEPAE_GET_U(pPT->a[iPte]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P \| X86_PTE_PAE_MBZ_MASK_NX)) == u64)
3495	{
3496	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pte=%RX64\n", iPte, PGMSHWPTEPAE_GET_LOG(pPT->a[iPte])));
3497	X86PTEPAE Pte;
3498	Pte.u = (PGMSHWPTEPAE_GET_U(pPT->a[iPte]) & u64AndMask) \| u64OrMask;
3499	if (Pte.u & PGM_PTFLAGS_TRACK_DIRTY)
3500	Pte.u &= ~(X86PGPAEUINT)X86_PTE_RW; /* need to disallow writes when dirty bit tracking is still active. */
3501
3502	PGMSHWPTEPAE_ATOMIC_SET(pPT->a[iPte], Pte.u);
3503	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3504	return fRet;
3505	}
3506	#ifdef LOG_ENABLED
3507	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3508	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));
3509	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPT->a); i++)
3510	if ((PGMSHWPTEPAE_GET_U(pPT->a[i]) & (X86_PTE_PAE_PG_MASK \| X86_PTE_P \| X86_PTE_PAE_MBZ_MASK_NX)) == u64)
3511	Log(("i=%d cFound=%d\n", i, ++cFound));
3512	#endif
3513	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])));
3514	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);/
3515	break;
3516	}
3517
3518	#ifdef PGM_WITH_LARGE_PAGES
3519	/* Large page case only. */
3520	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
3521	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
3522	{
3523	Assert(pVM->pgm.s.fNestedPaging);
3524
3525	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PDE4M_P \| X86_PDE4M_PS;
3526	PEPTPD pPD = (PEPTPD)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3527
3528	Assert( pPage->enmKind != PGMPOOLKIND_EPT_PD_FOR_EPT_PD
3529	\|\| (pPD->a[iPte].u & EPT_E_LEAF));
3530
3531	if ((pPD->a[iPte].u & (EPT_PDE2M_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3532	{
3533	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pde=%RX64\n", iPte, pPD->a[iPte]));
3534	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3535	pPD->a[iPte].u = 0;
3536	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);
3537
3538	/* Update the counter as we're removing references. */
3539	Assert(pPage->cPresent);
3540	Assert(pPool->cPresent);
3541	pPage->cPresent--;
3542	pPool->cPresent--;
3543
3544	return fRet;
3545	}
3546	# ifdef LOG_ENABLED
3547	LogRel(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3548	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPD->a); i++)
3549	if ((pPD->a[i].u & (EPT_PDE2M_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3550	LogRel(("i=%d cFound=%d\n", i, ++cFound));
3551	# endif
3552	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d enmKind=%d\n", pPage->iFirstPresent, pPage->cPresent, pPage->enmKind));
3553	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);/
3554	break;
3555	}
3556
3557	/* AMD-V nested paging / /* @todo merge with EPT as we only check the parts that are identical. */
3558	case PGMPOOLKIND_PAE_PD_PHYS:
3559	{
3560	Assert(pVM->pgm.s.fNestedPaging);
3561
3562	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage) \| X86_PDE4M_P \| X86_PDE4M_PS;
3563	PX86PDPAE pPD = (PX86PDPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3564
3565	if ((pPD->a[iPte].u & (X86_PDE2M_PAE_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3566	{
3567	Log4(("pgmPoolTrackFlushGCPhysPTs: i=%d pde=%RX64\n", iPte, pPD->a[iPte]));
3568	STAM_COUNTER_INC(&pPool->StatTrackFlushEntry);
3569	pPD->a[iPte].u = 0;
3570	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);
3571
3572	/* Update the counter as we're removing references. */
3573	Assert(pPage->cPresent);
3574	Assert(pPool->cPresent);
3575	pPage->cPresent--;
3576	pPool->cPresent--;
3577	return fRet;
3578	}
3579	# ifdef LOG_ENABLED
3580	Log(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3581	for (unsigned i = 0, cFound = 0; i < RT_ELEMENTS(pPD->a); i++)
3582	if ((pPD->a[i].u & (X86_PDE2M_PAE_PG_MASK \| X86_PDE4M_P \| X86_PDE4M_PS)) == u64)
3583	Log(("i=%d cFound=%d\n", i, ++cFound));
3584	# endif
3585	AssertFatalMsgFailed(("iFirstPresent=%d cPresent=%d\n", pPage->iFirstPresent, pPage->cPresent));
3586	/PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPD);/
3587	break;
3588	}
3589	#endif /* PGM_WITH_LARGE_PAGES */
3590
3591	default:
3592	AssertFatalMsgFailed(("enmKind=%d iShw=%d\n", pPage->enmKind, iShw));
3593	}
3594
3595	/* not reached. */
3596	#ifndef _MSC_VER
3597	return fRet;
3598	#endif
3599	}
3600
3601
3602	/**
3603	* Scans one shadow page table for mappings of a physical page.
3604	*
3605	* @param pVM The cross context VM structure.
3606	* @param pPhysPage The guest page in question.
3607	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3608	* @param iShw The shadow page table.
3609	*/
3610	static void pgmPoolTrackFlushGCPhysPT(PVM pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iShw)
3611	{
3612	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool); NOREF(pPool);
3613
3614	/* We should only come here with when there's only one reference to this physical page. */
3615	Assert(PGMPOOL_TD_GET_CREFS(PGM_PAGE_GET_TRACKING(pPhysPage)) == 1);
3616
3617	Log2(("pgmPoolTrackFlushGCPhysPT: pPhysPage=%RHp iShw=%d\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iShw));
3618	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPT, f);
3619	bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, iShw, PGM_PAGE_GET_PTE_INDEX(pPhysPage));
3620	if (!fKeptPTEs)
3621	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3622	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPT, f);
3623	}
3624
3625
3626	/**
3627	* Flushes a list of shadow page tables mapping the same physical page.
3628	*
3629	* @param pVM The cross context VM structure.
3630	* @param pPhysPage The guest page in question.
3631	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3632	* @param iPhysExt The physical cross reference extent list to flush.
3633	*/
3634	static void pgmPoolTrackFlushGCPhysPTs(PVMCC pVM, PPGMPAGE pPhysPage, bool fFlushPTEs, uint16_t iPhysExt)
3635	{
3636	PGM_LOCK_ASSERT_OWNER(pVM);
3637	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3638	bool fKeepList = false;
3639
3640	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTs, f);
3641	Log2(("pgmPoolTrackFlushGCPhysPTs: pPhysPage=%RHp iPhysExt=%u\n", PGM_PAGE_GET_HCPHYS(pPhysPage), iPhysExt));
3642
3643	const uint16_t iPhysExtStart = iPhysExt;
3644	PPGMPOOLPHYSEXT pPhysExt;
3645	do
3646	{
3647	Assert(iPhysExt < pPool->cMaxPhysExts);
3648	pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
3649	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
3650	{
3651	if (pPhysExt->aidx[i] != NIL_PGMPOOL_IDX)
3652	{
3653	bool fKeptPTEs = pgmPoolTrackFlushGCPhysPTInt(pVM, pPhysPage, fFlushPTEs, pPhysExt->aidx[i], pPhysExt->apte[i]);
3654	if (!fKeptPTEs)
3655	{
3656	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
3657	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
3658	}
3659	else
3660	fKeepList = true;
3661	}
3662	}
3663	/* next */
3664	iPhysExt = pPhysExt->iNext;
3665	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
3666
3667	if (!fKeepList)
3668	{
3669	/* insert the list into the free list and clear the ram range entry. */
3670	pPhysExt->iNext = pPool->iPhysExtFreeHead;
3671	pPool->iPhysExtFreeHead = iPhysExtStart;
3672	/* Invalidate the tracking data. */
3673	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3674	}
3675
3676	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTs, f);
3677	}
3678
3679
3680	/**
3681	* Flushes all shadow page table mappings of the given guest page.
3682	*
3683	* This is typically called when the host page backing the guest one has been
3684	* replaced or when the page protection was changed due to a guest access
3685	* caught by the monitoring.
3686	*
3687	* @returns VBox status code.
3688	* @retval VINF_SUCCESS if all references has been successfully cleared.
3689	* @retval VINF_PGM_SYNC_CR3 if we're better off with a CR3 sync and a page
3690	* pool cleaning. FF and sync flags are set.
3691	*
3692	* @param pVM The cross context VM structure.
3693	* @param GCPhysPage GC physical address of the page in question
3694	* @param pPhysPage The guest page in question.
3695	* @param fFlushPTEs Flush PTEs or allow them to be updated (e.g. in case of an RW bit change)
3696	* @param pfFlushTLBs This is set to @a true if the shadow TLBs should be
3697	* flushed, it is NOT touched if this isn't necessary.
3698	* The caller MUST initialized this to @a false.
3699	*/
3700	int pgmPoolTrackUpdateGCPhys(PVMCC pVM, RTGCPHYS GCPhysPage, PPGMPAGE pPhysPage, bool fFlushPTEs, bool *pfFlushTLBs)
3701	{
3702	PVMCPUCC pVCpu = VMMGetCpu(pVM);
3703	PGM_LOCK_VOID(pVM);
3704	int rc = VINF_SUCCESS;
3705
3706	#ifdef PGM_WITH_LARGE_PAGES
3707	/* Is this page part of a large page? */
3708	if (PGM_PAGE_GET_PDE_TYPE(pPhysPage) == PGM_PAGE_PDE_TYPE_PDE)
3709	{
3710	RTGCPHYS GCPhysBase = GCPhysPage & X86_PDE2M_PAE_PG_MASK;
3711	GCPhysPage &= X86_PDE_PAE_PG_MASK;
3712
3713	/* Fetch the large page base. */
3714	PPGMPAGE pLargePage;
3715	if (GCPhysBase != GCPhysPage)
3716	{
3717	pLargePage = pgmPhysGetPage(pVM, GCPhysBase);
3718	AssertFatal(pLargePage);
3719	}
3720	else
3721	pLargePage = pPhysPage;
3722
3723	Log(("pgmPoolTrackUpdateGCPhys: update large page PDE for %RGp (%RGp)\n", GCPhysBase, GCPhysPage));
3724
3725	if (PGM_PAGE_GET_PDE_TYPE(pLargePage) == PGM_PAGE_PDE_TYPE_PDE)
3726	{
3727	/* Mark the large page as disabled as we need to break it up to change a single page in the 2 MB range. */
3728	PGM_PAGE_SET_PDE_TYPE(pVM, pLargePage, PGM_PAGE_PDE_TYPE_PDE_DISABLED);
3729	pVM->pgm.s.cLargePagesDisabled++;
3730
3731	/* Update the base as that only that one has a reference and there's only one PDE to clear. */
3732	rc = pgmPoolTrackUpdateGCPhys(pVM, GCPhysBase, pLargePage, fFlushPTEs, pfFlushTLBs);
3733
3734	*pfFlushTLBs = true;
3735	PGM_UNLOCK(pVM);
3736	return rc;
3737	}
3738	}
3739	#else
3740	NOREF(GCPhysPage);
3741	#endif /* PGM_WITH_LARGE_PAGES */
3742
3743	const uint16_t u16 = PGM_PAGE_GET_TRACKING(pPhysPage);
3744	if (u16)
3745	{
3746	/*
3747	* The zero page is currently screwing up the tracking and we'll
3748	* have to flush the whole shebang. Unless VBOX_WITH_NEW_LAZY_PAGE_ALLOC
3749	* is defined, zero pages won't normally be mapped. Some kind of solution
3750	* will be needed for this problem of course, but it will have to wait...
3751	*/
3752	# ifndef VBOX_WITH_NEW_LAZY_PAGE_ALLOC /* end up guruing after pgmR0PhysAllocateLargePage otherwise. */
3753	if ( PGM_PAGE_IS_ZERO(pPhysPage)
3754	\|\| PGM_PAGE_IS_BALLOONED(pPhysPage))
3755	# else
3756	if (PGM_PAGE_IS_BALLOONED(pPhysPage))
3757	# endif
3758	rc = VINF_PGM_GCPHYS_ALIASED;
3759	else
3760	{
3761	if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
3762	{
3763	Assert(PGMPOOL_TD_GET_CREFS(u16) == 1);
3764	pgmPoolTrackFlushGCPhysPT(pVM,
3765	pPhysPage,
3766	fFlushPTEs,
3767	PGMPOOL_TD_GET_IDX(u16));
3768	}
3769	else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
3770	pgmPoolTrackFlushGCPhysPTs(pVM, pPhysPage, fFlushPTEs, PGMPOOL_TD_GET_IDX(u16));
3771	else
3772	rc = pgmPoolTrackFlushGCPhysPTsSlow(pVM, pPhysPage);
3773	*pfFlushTLBs = true;
3774	}
3775	}
3776
3777	if (rc == VINF_PGM_GCPHYS_ALIASED)
3778	{
3779	pVCpu->pgm.s.fSyncFlags \|= PGM_SYNC_CLEAR_PGM_POOL;
3780	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
3781	rc = VINF_PGM_SYNC_CR3;
3782	}
3783	PGM_UNLOCK(pVM);
3784	return rc;
3785	}
3786
3787
3788	/**
3789	* Scans all shadow page tables for mappings of a physical page.
3790	*
3791	* This may be slow, but it's most likely more efficient than cleaning
3792	* out the entire page pool / cache.
3793	*
3794	* @returns VBox status code.
3795	* @retval VINF_SUCCESS if all references has been successfully cleared.
3796	* @retval VINF_PGM_GCPHYS_ALIASED if we're better off with a CR3 sync and
3797	* a page pool cleaning.
3798	*
3799	* @param pVM The cross context VM structure.
3800	* @param pPhysPage The guest page in question.
3801	*/
3802	int pgmPoolTrackFlushGCPhysPTsSlow(PVMCC pVM, PPGMPAGE pPhysPage)
3803	{
3804	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
3805	STAM_PROFILE_START(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3806	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: cUsedPages=%d cPresent=%d pPhysPage=%R[pgmpage]\n",
3807	pPool->cUsedPages, pPool->cPresent, pPhysPage));
3808
3809	/*
3810	* There is a limit to what makes sense.
3811	*/
3812	if ( pPool->cPresent > 1024
3813	&& pVM->cCpus == 1)
3814	{
3815	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: giving up... (cPresent=%d)\n", pPool->cPresent));
3816	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3817	return VINF_PGM_GCPHYS_ALIASED;
3818	}
3819
3820	/*
3821	* Iterate all the pages until we've encountered all that in use.
3822	* This is simple but not quite optimal solution.
3823	*/
3824	const uint64_t u64 = PGM_PAGE_GET_HCPHYS(pPhysPage);
3825	unsigned cLeft = pPool->cUsedPages;
3826	unsigned iPage = pPool->cCurPages;
3827	while (--iPage >= PGMPOOL_IDX_FIRST)
3828	{
3829	PPGMPOOLPAGE pPage = &pPool->aPages[iPage];
3830	if ( pPage->GCPhys != NIL_RTGCPHYS
3831	&& pPage->cPresent)
3832	{
3833	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage)); /* see if it hits */
3834	switch (pPage->enmKind)
3835	{
3836	/*
3837	* We only care about shadow page tables.
3838	*/
3839	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
3840	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
3841	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
3842	{
3843	const uint32_t u32 = (uint32_t)u64;
3844	unsigned cPresent = pPage->cPresent;
3845	PX86PT pPT = (PX86PT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3846	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3847	{
3848	const X86PGUINT uPte = pPT->a[i].u;
3849	if (uPte & X86_PTE_P)
3850	{
3851	if ((uPte & X86_PTE_PG_MASK) == u32)
3852	{
3853	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX32\n", iPage, i, pPT->a[i]));
3854	ASMAtomicWriteU32(&pPT->a[i].u, 0);
3855
3856	/* Update the counter as we're removing references. */
3857	Assert(pPage->cPresent);
3858	Assert(pPool->cPresent);
3859	pPage->cPresent--;
3860	pPool->cPresent--;
3861	}
3862	if (!--cPresent)
3863	break;
3864	}
3865	}
3866	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3867	break;
3868	}
3869
3870	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
3871	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
3872	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
3873	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
3874	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
3875	{
3876	unsigned cPresent = pPage->cPresent;
3877	PPGMSHWPTPAE pPT = (PPGMSHWPTPAE)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3878	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3879	if (PGMSHWPTEPAE_IS_P(pPT->a[i]))
3880	{
3881	if ((PGMSHWPTEPAE_GET_U(pPT->a[i]) & X86_PTE_PAE_PG_MASK) == u64)
3882	{
3883	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX64\n", iPage, i, pPT->a[i]));
3884	PGMSHWPTEPAE_ATOMIC_SET(pPT->a[i], 0); /// @todo why not atomic?
3885
3886	/* Update the counter as we're removing references. */
3887	Assert(pPage->cPresent);
3888	Assert(pPool->cPresent);
3889	pPage->cPresent--;
3890	pPool->cPresent--;
3891	}
3892	if (!--cPresent)
3893	break;
3894	}
3895	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3896	break;
3897	}
3898
3899	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
3900	{
3901	unsigned cPresent = pPage->cPresent;
3902	PEPTPT pPT = (PEPTPT)PGMPOOL_PAGE_2_PTR(pVM, pPage);
3903	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pPT->a); i++)
3904	{
3905	X86PGPAEUINT const uPte = pPT->a[i].u;
3906	if (uPte & EPT_E_READ)
3907	{
3908	if ((uPte & EPT_PTE_PG_MASK) == u64)
3909	{
3910	//Log4(("pgmPoolTrackFlushGCPhysPTsSlow: idx=%d i=%d pte=%RX64\n", iPage, i, pPT->a[i]));
3911	ASMAtomicWriteU64(&pPT->a[i].u, 0);
3912
3913	/* Update the counter as we're removing references. */
3914	Assert(pPage->cPresent);
3915	Assert(pPool->cPresent);
3916	pPage->cPresent--;
3917	pPool->cPresent--;
3918	}
3919	if (!--cPresent)
3920	break;
3921	}
3922	}
3923	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pPT);
3924	break;
3925	}
3926	}
3927
3928	if (!--cLeft)
3929	break;
3930	}
3931	}
3932
3933	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
3934	STAM_PROFILE_STOP(&pPool->StatTrackFlushGCPhysPTsSlow, s);
3935
3936	/*
3937	* There is a limit to what makes sense. The above search is very expensive, so force a pgm pool flush.
3938	*/
3939	if (pPool->cPresent > 1024)
3940	{
3941	LogFlow(("pgmPoolTrackFlushGCPhysPTsSlow: giving up... (cPresent=%d)\n", pPool->cPresent));
3942	return VINF_PGM_GCPHYS_ALIASED;
3943	}
3944
3945	return VINF_SUCCESS;
3946	}
3947
3948
3949	/**
3950	* Clears the user entry in a user table.
3951	*
3952	* This is used to remove all references to a page when flushing it.
3953	*/
3954	static void pgmPoolTrackClearPageUser(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PCPGMPOOLUSER pUser)
3955	{
3956	Assert(pUser->iUser != NIL_PGMPOOL_IDX);
3957	Assert(pUser->iUser < pPool->cCurPages);
3958	uint32_t iUserTable = pUser->iUserTable;
3959
3960	/*
3961	* Map the user page. Ignore references made by fictitious pages.
3962	*/
3963	PPGMPOOLPAGE pUserPage = &pPool->aPages[pUser->iUser];
3964	LogFlow(("pgmPoolTrackClearPageUser: clear %x in %s (%RGp) (flushing %s)\n", iUserTable, pgmPoolPoolKindToStr(pUserPage->enmKind), pUserPage->Core.Key, pgmPoolPoolKindToStr(pPage->enmKind)));
3965	union
3966	{
3967	uint64_t *pau64;
3968	uint32_t *pau32;
3969	} u;
3970	if (pUserPage->idx < PGMPOOL_IDX_FIRST)
3971	{
3972	Assert(!pUserPage->pvPageR3);
3973	return;
3974	}
3975	u.pau64 = (uint64_t *)PGMPOOL_PAGE_2_PTR(pPool->CTX_SUFF(pVM), pUserPage);
3976
3977
3978	/* Safety precaution in case we change the paging for other modes too in the future. */
3979	Assert(!pgmPoolIsPageLocked(pPage)); RT_NOREF_PV(pPage);
3980
3981	#ifdef VBOX_STRICT
3982	/*
3983	* Some sanity checks.
3984	*/
3985	switch (pUserPage->enmKind)
3986	{
3987	case PGMPOOLKIND_32BIT_PD:
3988	case PGMPOOLKIND_32BIT_PD_PHYS:
3989	Assert(iUserTable < X86_PG_ENTRIES);
3990	break;
3991	case PGMPOOLKIND_PAE_PDPT:
3992	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
3993	case PGMPOOLKIND_PAE_PDPT_PHYS:
3994	Assert(iUserTable < 4);
3995	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
3996	break;
3997	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
3998	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
3999	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
4000	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
4001	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
4002	case PGMPOOLKIND_PAE_PD_PHYS:
4003	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4004	break;
4005	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
4006	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4007	break;
4008	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
4009	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4010	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
4011	break;
4012	case PGMPOOLKIND_64BIT_PML4:
4013	Assert(!(u.pau64[iUserTable] & PGM_PLXFLAGS_PERMANENT));
4014	/* GCPhys >> PAGE_SHIFT is the index here */
4015	break;
4016	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
4017	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
4018	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4019	break;
4020
4021	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
4022	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
4023	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4024	break;
4025
4026	case PGMPOOLKIND_ROOT_NESTED:
4027	Assert(iUserTable < X86_PG_PAE_ENTRIES);
4028	break;
4029
4030	# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
4031	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
4032	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
4033	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
4034	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
4035	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
4036	Assert(iUserTable < EPT_PG_ENTRIES);
4037	break;
4038	# endif
4039
4040	default:
4041	AssertMsgFailed(("enmKind=%d GCPhys=%RGp\n", pUserPage->enmKind, pPage->GCPhys));
4042	break;
4043	}
4044	#endif /* VBOX_STRICT */
4045
4046	/*
4047	* Clear the entry in the user page.
4048	*/
4049	switch (pUserPage->enmKind)
4050	{
4051	/* 32-bit entries */
4052	case PGMPOOLKIND_32BIT_PD:
4053	case PGMPOOLKIND_32BIT_PD_PHYS:
4054	ASMAtomicWriteU32(&u.pau32[iUserTable], 0);
4055	break;
4056
4057	/* 64-bit entries */
4058	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
4059	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
4060	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
4061	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
4062	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
4063	case PGMPOOLKIND_PAE_PD_PHYS:
4064	case PGMPOOLKIND_PAE_PDPT_PHYS:
4065	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
4066	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
4067	case PGMPOOLKIND_64BIT_PML4:
4068	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
4069	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
4070	case PGMPOOLKIND_PAE_PDPT:
4071	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
4072	case PGMPOOLKIND_ROOT_NESTED:
4073	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
4074	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
4075	# ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
4076	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
4077	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
4078	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
4079	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
4080	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
4081	#endif
4082	ASMAtomicWriteU64(&u.pau64[iUserTable], 0);
4083	break;
4084
4085	default:
4086	AssertFatalMsgFailed(("enmKind=%d iUser=%d iUserTable=%#x\n", pUserPage->enmKind, pUser->iUser, pUser->iUserTable));
4087	}
4088	PGM_DYNMAP_UNUSED_HINT_VM(pPool->CTX_SUFF(pVM), u.pau64);
4089	}
4090
4091
4092	/**
4093	* Clears all users of a page.
4094	*/
4095	static void pgmPoolTrackClearPageUsers(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
4096	{
4097	/*
4098	* Free all the user records.
4099	*/
4100	LogFlow(("pgmPoolTrackClearPageUsers %RGp\n", pPage->GCPhys));
4101
4102	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
4103	uint16_t i = pPage->iUserHead;
4104	while (i != NIL_PGMPOOL_USER_INDEX)
4105	{
4106	/* Clear enter in user table. */
4107	pgmPoolTrackClearPageUser(pPool, pPage, &paUsers[i]);
4108
4109	/* Free it. */
4110	const uint16_t iNext = paUsers[i].iNext;
4111	paUsers[i].iUser = NIL_PGMPOOL_IDX;
4112	paUsers[i].iNext = pPool->iUserFreeHead;
4113	pPool->iUserFreeHead = i;
4114
4115	/* Next. */
4116	i = iNext;
4117	}
4118	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
4119	}
4120
4121
4122	/**
4123	* Allocates a new physical cross reference extent.
4124	*
4125	* @returns Pointer to the allocated extent on success. NULL if we're out of them.
4126	* @param pVM The cross context VM structure.
4127	* @param piPhysExt Where to store the phys ext index.
4128	*/
4129	PPGMPOOLPHYSEXT pgmPoolTrackPhysExtAlloc(PVMCC pVM, uint16_t *piPhysExt)
4130	{
4131	PGM_LOCK_ASSERT_OWNER(pVM);
4132	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4133	uint16_t iPhysExt = pPool->iPhysExtFreeHead;
4134	if (iPhysExt == NIL_PGMPOOL_PHYSEXT_INDEX)
4135	{
4136	STAM_COUNTER_INC(&pPool->StamTrackPhysExtAllocFailures);
4137	return NULL;
4138	}
4139	PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4140	pPool->iPhysExtFreeHead = pPhysExt->iNext;
4141	pPhysExt->iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
4142	*piPhysExt = iPhysExt;
4143	return pPhysExt;
4144	}
4145
4146
4147	/**
4148	* Frees a physical cross reference extent.
4149	*
4150	* @param pVM The cross context VM structure.
4151	* @param iPhysExt The extent to free.
4152	*/
4153	void pgmPoolTrackPhysExtFree(PVMCC pVM, uint16_t iPhysExt)
4154	{
4155	PGM_LOCK_ASSERT_OWNER(pVM);
4156	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4157	Assert(iPhysExt < pPool->cMaxPhysExts);
4158	PPGMPOOLPHYSEXT pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4159	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
4160	{
4161	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
4162	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4163	}
4164	pPhysExt->iNext = pPool->iPhysExtFreeHead;
4165	pPool->iPhysExtFreeHead = iPhysExt;
4166	}
4167
4168
4169	/**
4170	* Frees a physical cross reference extent.
4171	*
4172	* @param pVM The cross context VM structure.
4173	* @param iPhysExt The extent to free.
4174	*/
4175	void pgmPoolTrackPhysExtFreeList(PVMCC pVM, uint16_t iPhysExt)
4176	{
4177	PGM_LOCK_ASSERT_OWNER(pVM);
4178	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4179
4180	const uint16_t iPhysExtStart = iPhysExt;
4181	PPGMPOOLPHYSEXT pPhysExt;
4182	do
4183	{
4184	Assert(iPhysExt < pPool->cMaxPhysExts);
4185	pPhysExt = &pPool->CTX_SUFF(paPhysExts)[iPhysExt];
4186	for (unsigned i = 0; i < RT_ELEMENTS(pPhysExt->aidx); i++)
4187	{
4188	pPhysExt->aidx[i] = NIL_PGMPOOL_IDX;
4189	pPhysExt->apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4190	}
4191
4192	/* next */
4193	iPhysExt = pPhysExt->iNext;
4194	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
4195
4196	pPhysExt->iNext = pPool->iPhysExtFreeHead;
4197	pPool->iPhysExtFreeHead = iPhysExtStart;
4198	}
4199
4200
4201	/**
4202	* Insert a reference into a list of physical cross reference extents.
4203	*
4204	* @returns The new tracking data for PGMPAGE.
4205	*
4206	* @param pVM The cross context VM structure.
4207	* @param iPhysExt The physical extent index of the list head.
4208	* @param iShwPT The shadow page table index.
4209	* @param iPte Page table entry
4210	*
4211	*/
4212	static uint16_t pgmPoolTrackPhysExtInsert(PVMCC pVM, uint16_t iPhysExt, uint16_t iShwPT, uint16_t iPte)
4213	{
4214	PGM_LOCK_ASSERT_OWNER(pVM);
4215	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
4216	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
4217
4218	/*
4219	* Special common cases.
4220	*/
4221	if (paPhysExts[iPhysExt].aidx[1] == NIL_PGMPOOL_IDX)
4222	{
4223	paPhysExts[iPhysExt].aidx[1] = iShwPT;
4224	paPhysExts[iPhysExt].apte[1] = iPte;
4225	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackAliasedMany);
4226	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{,%d pte %d,}\n", iPhysExt, iShwPT, iPte));
4227	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4228	}
4229	if (paPhysExts[iPhysExt].aidx[2] == NIL_PGMPOOL_IDX)
4230	{
4231	paPhysExts[iPhysExt].aidx[2] = iShwPT;
4232	paPhysExts[iPhysExt].apte[2] = iPte;
4233	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackAliasedMany);
4234	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{,,%d pte %d}\n", iPhysExt, iShwPT, iPte));
4235	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4236	}
4237	AssertCompile(RT_ELEMENTS(paPhysExts[iPhysExt].aidx) == 3);
4238
4239	/*
4240	* General treatment.
4241	*/
4242	const uint16_t iPhysExtStart = iPhysExt;
4243	unsigned cMax = 15;
4244	for (;;)
4245	{
4246	Assert(iPhysExt < pPool->cMaxPhysExts);
4247	for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4248	if (paPhysExts[iPhysExt].aidx[i] == NIL_PGMPOOL_IDX)
4249	{
4250	paPhysExts[iPhysExt].aidx[i] = iShwPT;
4251	paPhysExts[iPhysExt].apte[i] = iPte;
4252	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackAliasedMany);
4253	LogFlow(("pgmPoolTrackPhysExtInsert: %d:{%d pte %d} i=%d cMax=%d\n", iPhysExt, iShwPT, iPte, i, cMax));
4254	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtStart);
4255	}
4256	if (!--cMax)
4257	{
4258	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackOverflows);
4259	pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
4260	LogFlow(("pgmPoolTrackPhysExtInsert: overflow (1) iShwPT=%d\n", iShwPT));
4261	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4262	}
4263
4264	/* advance */
4265	iPhysExt = paPhysExts[iPhysExt].iNext;
4266	if (iPhysExt == NIL_PGMPOOL_PHYSEXT_INDEX)
4267	break;
4268	}
4269
4270	/*
4271	* Add another extent to the list.
4272	*/
4273	PPGMPOOLPHYSEXT pNew = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
4274	if (!pNew)
4275	{
4276	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackNoExtentsLeft);
4277	pgmPoolTrackPhysExtFreeList(pVM, iPhysExtStart);
4278	LogFlow(("pgmPoolTrackPhysExtInsert: pgmPoolTrackPhysExtAlloc failed iShwPT=%d\n", iShwPT));
4279	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4280	}
4281	pNew->iNext = iPhysExtStart;
4282	pNew->aidx[0] = iShwPT;
4283	pNew->apte[0] = iPte;
4284	LogFlow(("pgmPoolTrackPhysExtInsert: added new extent %d:{%d pte %d}->%d\n", iPhysExt, iShwPT, iPte, iPhysExtStart));
4285	return PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4286	}
4287
4288
4289	/**
4290	* Add a reference to guest physical page where extents are in use.
4291	*
4292	* @returns The new tracking data for PGMPAGE.
4293	*
4294	* @param pVM The cross context VM structure.
4295	* @param pPhysPage Pointer to the aPages entry in the ram range.
4296	* @param u16 The ram range flags (top 16-bits).
4297	* @param iShwPT The shadow page table index.
4298	* @param iPte Page table entry
4299	*/
4300	uint16_t pgmPoolTrackPhysExtAddref(PVMCC pVM, PPGMPAGE pPhysPage, uint16_t u16, uint16_t iShwPT, uint16_t iPte)
4301	{
4302	PGM_LOCK_VOID(pVM);
4303	if (PGMPOOL_TD_GET_CREFS(u16) != PGMPOOL_TD_CREFS_PHYSEXT)
4304	{
4305	/*
4306	* Convert to extent list.
4307	*/
4308	Assert(PGMPOOL_TD_GET_CREFS(u16) == 1);
4309	uint16_t iPhysExt;
4310	PPGMPOOLPHYSEXT pPhysExt = pgmPoolTrackPhysExtAlloc(pVM, &iPhysExt);
4311	if (pPhysExt)
4312	{
4313	LogFlow(("pgmPoolTrackPhysExtAddref: new extent: %d:{%d, %d}\n", iPhysExt, PGMPOOL_TD_GET_IDX(u16), iShwPT));
4314	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackAliased);
4315	pPhysExt->aidx[0] = PGMPOOL_TD_GET_IDX(u16);
4316	pPhysExt->apte[0] = PGM_PAGE_GET_PTE_INDEX(pPhysPage);
4317	pPhysExt->aidx[1] = iShwPT;
4318	pPhysExt->apte[1] = iPte;
4319	u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExt);
4320	}
4321	else
4322	u16 = PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED);
4323	}
4324	else if (u16 != PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, PGMPOOL_TD_IDX_OVERFLOWED))
4325	{
4326	/*
4327	* Insert into the extent list.
4328	*/
4329	u16 = pgmPoolTrackPhysExtInsert(pVM, PGMPOOL_TD_GET_IDX(u16), iShwPT, iPte);
4330	}
4331	else
4332	STAM_COUNTER_INC(&pVM->pgm.s.Stats.StatTrackAliasedLots);
4333	PGM_UNLOCK(pVM);
4334	return u16;
4335	}
4336
4337
4338	/**
4339	* Clear references to guest physical memory.
4340	*
4341	* @param pPool The pool.
4342	* @param pPage The page.
4343	* @param pPhysPage Pointer to the aPages entry in the ram range.
4344	* @param iPte Shadow PTE index
4345	*/
4346	void pgmPoolTrackPhysExtDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMPAGE pPhysPage, uint16_t iPte)
4347	{
4348	PVMCC pVM = pPool->CTX_SUFF(pVM);
4349	const unsigned cRefs = PGM_PAGE_GET_TD_CREFS(pPhysPage);
4350	AssertFatalMsg(cRefs == PGMPOOL_TD_CREFS_PHYSEXT, ("cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
4351
4352	uint16_t iPhysExt = PGM_PAGE_GET_TD_IDX(pPhysPage);
4353	if (iPhysExt != PGMPOOL_TD_IDX_OVERFLOWED)
4354	{
4355	PGM_LOCK_VOID(pVM);
4356
4357	uint16_t iPhysExtPrev = NIL_PGMPOOL_PHYSEXT_INDEX;
4358	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
4359	do
4360	{
4361	Assert(iPhysExt < pPool->cMaxPhysExts);
4362
4363	/*
4364	* Look for the shadow page and check if it's all freed.
4365	*/
4366	for (unsigned i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4367	{
4368	if ( paPhysExts[iPhysExt].aidx[i] == pPage->idx
4369	&& paPhysExts[iPhysExt].apte[i] == iPte)
4370	{
4371	paPhysExts[iPhysExt].aidx[i] = NIL_PGMPOOL_IDX;
4372	paPhysExts[iPhysExt].apte[i] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
4373
4374	for (i = 0; i < RT_ELEMENTS(paPhysExts[iPhysExt].aidx); i++)
4375	if (paPhysExts[iPhysExt].aidx[i] != NIL_PGMPOOL_IDX)
4376	{
4377	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d\n", pPhysPage, pPage->idx));
4378	PGM_UNLOCK(pVM);
4379	return;
4380	}
4381
4382	/* we can free the node. */
4383	const uint16_t iPhysExtNext = paPhysExts[iPhysExt].iNext;
4384	if ( iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX
4385	&& iPhysExtNext == NIL_PGMPOOL_PHYSEXT_INDEX)
4386	{
4387	/* lonely node */
4388	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4389	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d lonely\n", pPhysPage, pPage->idx));
4390	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, 0);
4391	}
4392	else if (iPhysExtPrev == NIL_PGMPOOL_PHYSEXT_INDEX)
4393	{
4394	/* head */
4395	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d head\n", pPhysPage, pPage->idx));
4396	PGM_PAGE_SET_TRACKING(pVM, pPhysPage, PGMPOOL_TD_MAKE(PGMPOOL_TD_CREFS_PHYSEXT, iPhysExtNext));
4397	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4398	}
4399	else
4400	{
4401	/* in list */
4402	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage] idx=%d in list\n", pPhysPage, pPage->idx));
4403	paPhysExts[iPhysExtPrev].iNext = iPhysExtNext;
4404	pgmPoolTrackPhysExtFree(pVM, iPhysExt);
4405	}
4406	iPhysExt = iPhysExtNext;
4407	PGM_UNLOCK(pVM);
4408	return;
4409	}
4410	}
4411
4412	/* next */
4413	iPhysExtPrev = iPhysExt;
4414	iPhysExt = paPhysExts[iPhysExt].iNext;
4415	} while (iPhysExt != NIL_PGMPOOL_PHYSEXT_INDEX);
4416
4417	PGM_UNLOCK(pVM);
4418	AssertFatalMsgFailed(("not-found! cRefs=%d pPhysPage=%R[pgmpage] pPage=%p:{.idx=%d}\n", cRefs, pPhysPage, pPage, pPage->idx));
4419	}
4420	else /* nothing to do */
4421	Log2(("pgmPoolTrackPhysExtDerefGCPhys: pPhysPage=%R[pgmpage]\n", pPhysPage));
4422	}
4423
4424	/**
4425	* Clear references to guest physical memory.
4426	*
4427	* This is the same as pgmPoolTracDerefGCPhysHint except that the guest
4428	* physical address is assumed to be correct, so the linear search can be
4429	* skipped and we can assert at an earlier point.
4430	*
4431	* @param pPool The pool.
4432	* @param pPage The page.
4433	* @param HCPhys The host physical address corresponding to the guest page.
4434	* @param GCPhys The guest physical address corresponding to HCPhys.
4435	* @param iPte Shadow PTE index
4436	*/
4437	static void pgmPoolTracDerefGCPhys(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhys, uint16_t iPte)
4438	{
4439	/*
4440	* Lookup the page and check if it checks out before derefing it.
4441	*/
4442	PVMCC pVM = pPool->CTX_SUFF(pVM);
4443	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhys);
4444	if (pPhysPage)
4445	{
4446	Assert(PGM_PAGE_GET_HCPHYS(pPhysPage));
4447	#ifdef LOG_ENABLED
4448	RTHCPHYS HCPhysPage = PGM_PAGE_GET_HCPHYS(pPhysPage);
4449	Log2(("pgmPoolTracDerefGCPhys %RHp vs %RHp\n", HCPhysPage, HCPhys));
4450	#endif
4451	if (PGM_PAGE_GET_HCPHYS(pPhysPage) == HCPhys)
4452	{
4453	Assert(pPage->cPresent);
4454	Assert(pPool->cPresent);
4455	pPage->cPresent--;
4456	pPool->cPresent--;
4457	pgmTrackDerefGCPhys(pPool, pPage, pPhysPage, iPte);
4458	return;
4459	}
4460
4461	AssertFatalMsgFailed(("HCPhys=%RHp GCPhys=%RGp; found page has HCPhys=%RHp iPte=%u fIsNested=%RTbool\n",
4462	HCPhys, GCPhys, PGM_PAGE_GET_HCPHYS(pPhysPage), iPte, PGMPOOL_PAGE_IS_NESTED(pPage)));
4463	}
4464	AssertFatalMsgFailed(("HCPhys=%RHp GCPhys=%RGp\n", HCPhys, GCPhys));
4465	}
4466
4467
4468	/**
4469	* Clear references to guest physical memory.
4470	*
4471	* @param pPool The pool.
4472	* @param pPage The page.
4473	* @param HCPhys The host physical address corresponding to the guest page.
4474	* @param GCPhysHint The guest physical address which may corresponding to HCPhys.
4475	* @param iPte Shadow pte index
4476	*/
4477	void pgmPoolTracDerefGCPhysHint(PPGMPOOL pPool, PPGMPOOLPAGE pPage, RTHCPHYS HCPhys, RTGCPHYS GCPhysHint, uint16_t iPte)
4478	{
4479	Log4(("pgmPoolTracDerefGCPhysHint %RHp %RGp\n", HCPhys, GCPhysHint));
4480
4481	/*
4482	* Try the hint first.
4483	*/
4484	RTHCPHYS HCPhysHinted;
4485	PVMCC pVM = pPool->CTX_SUFF(pVM);
4486	PPGMPAGE pPhysPage = pgmPhysGetPage(pVM, GCPhysHint);
4487	if (pPhysPage)
4488	{
4489	HCPhysHinted = PGM_PAGE_GET_HCPHYS(pPhysPage);
4490	Assert(HCPhysHinted);
4491	if (HCPhysHinted == HCPhys)
4492	{
4493	Assert(pPage->cPresent);
4494	Assert(pPool->cPresent);
4495	pPage->cPresent--;
4496	pPool->cPresent--;
4497	pgmTrackDerefGCPhys(pPool, pPage, pPhysPage, iPte);
4498	return;
4499	}
4500	}
4501	else
4502	HCPhysHinted = UINT64_C(0xdeadbeefdeadbeef);
4503
4504	/*
4505	* Damn, the hint didn't work. We'll have to do an expensive linear search.
4506	*/
4507	STAM_COUNTER_INC(&pPool->StatTrackLinearRamSearches);
4508	PPGMRAMRANGE pRam = pPool->CTX_SUFF(pVM)->pgm.s.CTX_SUFF(pRamRangesX);
4509	while (pRam)
4510	{
4511	unsigned iPage = pRam->cb >> PAGE_SHIFT;
4512	while (iPage-- > 0)
4513	{
4514	if (PGM_PAGE_GET_HCPHYS(&pRam->aPages[iPage]) == HCPhys)
4515	{
4516	Log4(("pgmPoolTracDerefGCPhysHint: Linear HCPhys=%RHp GCPhysHint=%RGp GCPhysReal=%RGp\n",
4517	HCPhys, GCPhysHint, pRam->GCPhys + (iPage << PAGE_SHIFT)));
4518	Assert(pPage->cPresent);
4519	Assert(pPool->cPresent);
4520	pPage->cPresent--;
4521	pPool->cPresent--;
4522	pgmTrackDerefGCPhys(pPool, pPage, &pRam->aPages[iPage], iPte);
4523	return;
4524	}
4525	}
4526	pRam = pRam->CTX_SUFF(pNext);
4527	}
4528
4529	AssertFatalMsgFailed(("HCPhys=%RHp GCPhysHint=%RGp (Hinted page has HCPhys = %RHp)\n", HCPhys, GCPhysHint, HCPhysHinted));
4530	}
4531
4532
4533	/**
4534	* Clear references to guest physical memory in a 32-bit / 32-bit page table.
4535	*
4536	* @param pPool The pool.
4537	* @param pPage The page.
4538	* @param pShwPT The shadow page table (mapping of the page).
4539	* @param pGstPT The guest page table.
4540	*/
4541	DECLINLINE(void) pgmPoolTrackDerefPT32Bit32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT, PCX86PT pGstPT)
4542	{
4543	RTGCPHYS32 const fPgMask = pPage->fA20Enabled ? X86_PTE_PG_MASK : X86_PTE_PG_MASK & ~RT_BIT_32(20);
4544	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4545	{
4546	const X86PGUINT uPte = pShwPT->a[i].u;
4547	Assert(!(uPte & RT_BIT_32(10)));
4548	if (uPte & X86_PTE_P)
4549	{
4550	Log4(("pgmPoolTrackDerefPT32Bit32Bit: i=%d pte=%RX32 hint=%RX32\n",
4551	i, uPte & X86_PTE_PG_MASK, pGstPT->a[i].u & X86_PTE_PG_MASK));
4552	pgmPoolTracDerefGCPhysHint(pPool, pPage, uPte & X86_PTE_PG_MASK, pGstPT->a[i].u & fPgMask, i);
4553	if (!pPage->cPresent)
4554	break;
4555	}
4556	}
4557	}
4558
4559
4560	/**
4561	* Clear references to guest physical memory in a PAE / 32-bit page table.
4562	*
4563	* @param pPool The pool.
4564	* @param pPage The page.
4565	* @param pShwPT The shadow page table (mapping of the page).
4566	* @param pGstPT The guest page table (just a half one).
4567	*/
4568	DECLINLINE(void) pgmPoolTrackDerefPTPae32Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PT pGstPT)
4569	{
4570	RTGCPHYS32 const fPgMask = pPage->fA20Enabled ? X86_PTE_PG_MASK : X86_PTE_PG_MASK & ~RT_BIT_32(20);
4571	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4572	{
4573	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4574	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4575	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4576	{
4577	Log4(("pgmPoolTrackDerefPTPae32Bit: i=%d pte=%RX64 hint=%RX32\n",
4578	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & X86_PTE_PG_MASK));
4579	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & fPgMask, i);
4580	if (!pPage->cPresent)
4581	break;
4582	}
4583	}
4584	}
4585
4586
4587	/**
4588	* Clear references to guest physical memory in a PAE / PAE page table.
4589	*
4590	* @param pPool The pool.
4591	* @param pPage The page.
4592	* @param pShwPT The shadow page table (mapping of the page).
4593	* @param pGstPT The guest page table.
4594	*/
4595	DECLINLINE(void) pgmPoolTrackDerefPTPaePae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT, PCX86PTPAE pGstPT)
4596	{
4597	RTGCPHYS const fPgMask = pPage->fA20Enabled ? X86_PTE_PAE_PG_MASK : X86_PTE_PAE_PG_MASK & ~RT_BIT_64(20);
4598	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4599	{
4600	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4601	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4602	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4603	{
4604	Log4(("pgmPoolTrackDerefPTPaePae: i=%d pte=%RX32 hint=%RX32\n",
4605	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & X86_PTE_PAE_PG_MASK));
4606	pgmPoolTracDerefGCPhysHint(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), pGstPT->a[i].u & fPgMask, i);
4607	if (!pPage->cPresent)
4608	break;
4609	}
4610	}
4611	}
4612
4613
4614	/**
4615	* Clear references to guest physical memory in a 32-bit / 4MB page table.
4616	*
4617	* @param pPool The pool.
4618	* @param pPage The page.
4619	* @param pShwPT The shadow page table (mapping of the page).
4620	*/
4621	DECLINLINE(void) pgmPoolTrackDerefPT32Bit4MB(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PT pShwPT)
4622	{
4623	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4624	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4625	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4626	{
4627	const X86PGUINT uPte = pShwPT->a[i].u;
4628	Assert(!(uPte & RT_BIT_32(10)));
4629	if (uPte & X86_PTE_P)
4630	{
4631	Log4(("pgmPoolTrackDerefPT32Bit4MB: i=%d pte=%RX32 GCPhys=%RGp\n",
4632	i, uPte & X86_PTE_PG_MASK, GCPhys));
4633	pgmPoolTracDerefGCPhys(pPool, pPage, uPte & X86_PTE_PG_MASK, GCPhys & GCPhysA20Mask, i);
4634	if (!pPage->cPresent)
4635	break;
4636	}
4637	}
4638	}
4639
4640
4641	/**
4642	* Clear references to guest physical memory in a PAE / 2/4MB page table.
4643	*
4644	* @param pPool The pool.
4645	* @param pPage The page.
4646	* @param pShwPT The shadow page table (mapping of the page).
4647	*/
4648	DECLINLINE(void) pgmPoolTrackDerefPTPaeBig(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PPGMSHWPTPAE pShwPT)
4649	{
4650	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4651	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4652	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4653	{
4654	Assert( (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == 0
4655	\|\| (PGMSHWPTEPAE_GET_U(pShwPT->a[i]) & UINT64_C(0x7ff0000000000400)) == UINT64_C(0x7ff0000000000000));
4656	if (PGMSHWPTEPAE_IS_P(pShwPT->a[i]))
4657	{
4658	Log4(("pgmPoolTrackDerefPTPaeBig: i=%d pte=%RX64 hint=%RGp\n",
4659	i, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), GCPhys));
4660	pgmPoolTracDerefGCPhys(pPool, pPage, PGMSHWPTEPAE_GET_HCPHYS(pShwPT->a[i]), GCPhys & GCPhysA20Mask, i);
4661	if (!pPage->cPresent)
4662	break;
4663	}
4664	}
4665	}
4666
4667
4668	/**
4669	* Clear references to shadowed pages in an EPT page table.
4670	*
4671	* @param pPool The pool.
4672	* @param pPage The page.
4673	* @param pShwPT The shadow page directory pointer table (mapping of the
4674	* page).
4675	*/
4676	DECLINLINE(void) pgmPoolTrackDerefPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPT pShwPT)
4677	{
4678	RTGCPHYS const GCPhysA20Mask = pPage->fA20Enabled ? UINT64_MAX : ~RT_BIT_64(20);
4679	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4680	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4681	{
4682	X86PGPAEUINT const uPte = pShwPT->a[i].u;
4683	Assert((uPte & UINT64_C(0xfff0000000000f80)) == 0);
4684	if (uPte & EPT_E_READ)
4685	{
4686	Log4(("pgmPoolTrackDerefPTEPT: i=%d pte=%RX64 GCPhys=%RX64\n",
4687	i, uPte & EPT_PTE_PG_MASK, pPage->GCPhys));
4688	pgmPoolTracDerefGCPhys(pPool, pPage, uPte & EPT_PTE_PG_MASK, GCPhys & GCPhysA20Mask, i);
4689	if (!pPage->cPresent)
4690	break;
4691	}
4692	}
4693	}
4694
4695	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
4696
4697	/**
4698	* Clears references to shadowed pages in a SLAT EPT page table.
4699	*
4700	* @param pPool The pool.
4701	* @param pPage The page.
4702	* @param pShwPT The shadow page table (mapping of the page).
4703	* @param pGstPT The guest page table.
4704	*/
4705	DECLINLINE(void) pgmPoolTrackDerefNestedPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPT pShwPT, PCEPTPT pGstPT)
4706	{
4707	Assert(PGMPOOL_PAGE_IS_NESTED(pPage));
4708	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++)
4709	{
4710	X86PGPAEUINT const uShwPte = pShwPT->a[i].u;
4711	Assert((uShwPte & UINT64_C(0xfff0000000000f80)) == 0); /* Access, Dirty, UserX (not supported) and ignored bits 7, 11. */
4712	if (uShwPte & EPT_PRESENT_MASK)
4713	{
4714	Log7Func(("Shw=%RX64 GstPte=%RX64\n", uShwPte, pGstPT->a[i].u));
4715	pgmPoolTracDerefGCPhys(pPool, pPage, uShwPte & EPT_PTE_PG_MASK, pGstPT->a[i].u & EPT_PTE_PG_MASK, i);
4716	if (!pPage->cPresent)
4717	break;
4718	}
4719	}
4720	}
4721
4722
4723	/**
4724	* Clear references to guest physical memory in a SLAT 2MB EPT page table.
4725	*
4726	* @param pPool The pool.
4727	* @param pPage The page.
4728	* @param pShwPT The shadow page table (mapping of the page).
4729	*/
4730	DECLINLINE(void) pgmPoolTrackDerefNestedPTEPT2MB(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPT pShwPT)
4731	{
4732	Assert(pPage->fA20Enabled);
4733	RTGCPHYS GCPhys = pPage->GCPhys + PAGE_SIZE * pPage->iFirstPresent;
4734	for (unsigned i = pPage->iFirstPresent; i < RT_ELEMENTS(pShwPT->a); i++, GCPhys += PAGE_SIZE)
4735	{
4736	X86PGPAEUINT const uShwPte = pShwPT->a[i].u;
4737	Assert((uShwPte & UINT64_C(0xfff0000000000f80)) == 0); /* Access, Dirty, UserX (not supported) and ignored bits 7, 11. */
4738	if (uShwPte & EPT_PRESENT_MASK)
4739	{
4740	Log7Func(("Shw=%RX64 GstPte=%RX64\n", uShwPte, GCPhys));
4741	pgmPoolTracDerefGCPhys(pPool, pPage, uShwPte & EPT_PTE_PG_MASK, GCPhys, i);
4742	if (!pPage->cPresent)
4743	break;
4744	}
4745	}
4746	}
4747
4748
4749	/**
4750	* Clear references to shadowed pages in a SLAT EPT page directory.
4751	*
4752	* @param pPool The pool.
4753	* @param pPage The page.
4754	* @param pShwPD The shadow page directory (mapping of the page).
4755	* @param pGstPD The guest page directory.
4756	*/
4757	DECLINLINE(void) pgmPoolTrackDerefNestedPDEpt(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPD pShwPD, PCEPTPD pGstPD)
4758	{
4759	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4760	{
4761	X86PGPAEUINT const uPde = pShwPD->a[i].u;
4762	#ifdef PGM_WITH_LARGE_PAGES
4763	AssertMsg((uPde & UINT64_C(0xfff0000000000f00)) == 0, ("uPde=%RX64\n", uPde));
4764	#else
4765	AssertMsg((uPde & UINT64_C(0xfff0000000000f80)) == 0, ("uPde=%RX64\n", uPde));
4766	#endif
4767	if (uPde & EPT_PRESENT_MASK)
4768	{
4769	#ifdef PGM_WITH_LARGE_PAGES
4770	if (uPde & EPT_E_LEAF)
4771	{
4772	Log4(("pgmPoolTrackDerefPDEPT: i=%d pde=%RX64 GCPhys=%RX64\n", i, uPde & EPT_PDE2M_PG_MASK, pPage->GCPhys));
4773	pgmPoolTracDerefGCPhys(pPool, pPage, uPde & EPT_PDE2M_PG_MASK, pGstPD->a[i].u & EPT_PDE2M_PG_MASK, i);
4774	}
4775	else
4776	#endif
4777	{
4778	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPde & 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	}
4785	}
4786	}
4787
4788	#endif /* VBOX_WITH_NESTED_HWVIRT_VMX_EPT */
4789
4790
4791	/**
4792	* Clear references to shadowed pages in a 32 bits page directory.
4793	*
4794	* @param pPool The pool.
4795	* @param pPage The page.
4796	* @param pShwPD The shadow page directory (mapping of the page).
4797	*/
4798	DECLINLINE(void) pgmPoolTrackDerefPD(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PD pShwPD)
4799	{
4800	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4801	{
4802	X86PGUINT const uPde = pShwPD->a[i].u;
4803	if (uPde & X86_PDE_P)
4804	{
4805	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, pShwPD->a[i].u & X86_PDE_PG_MASK);
4806	if (pSubPage)
4807	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4808	else
4809	AssertFatalMsgFailed(("%x\n", pShwPD->a[i].u & X86_PDE_PG_MASK));
4810	}
4811	}
4812	}
4813
4814
4815	/**
4816	* Clear references to shadowed pages in a PAE (legacy or 64 bits) page directory.
4817	*
4818	* @param pPool The pool.
4819	* @param pPage The page.
4820	* @param pShwPD The shadow page directory (mapping of the page).
4821	*/
4822	DECLINLINE(void) pgmPoolTrackDerefPDPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPAE pShwPD)
4823	{
4824	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4825	{
4826	X86PGPAEUINT const uPde = pShwPD->a[i].u;
4827	if (uPde & X86_PDE_P)
4828	{
4829	#ifdef PGM_WITH_LARGE_PAGES
4830	if (uPde & X86_PDE_PS)
4831	{
4832	Log4(("pgmPoolTrackDerefPDPae: i=%d pde=%RX64 GCPhys=%RX64\n",
4833	i, uPde & X86_PDE2M_PAE_PG_MASK, pPage->GCPhys));
4834	pgmPoolTracDerefGCPhys(pPool, pPage, uPde & X86_PDE2M_PAE_PG_MASK,
4835	pPage->GCPhys + i * 2 * _1M /* pPage->GCPhys = base address of the memory described by the PD */,
4836	i);
4837	}
4838	else
4839	#endif
4840	{
4841	Assert((uPde & (X86_PDE_PAE_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000000))) == 0);
4842	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPde & X86_PDE_PAE_PG_MASK);
4843	if (pSubPage)
4844	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4845	else
4846	AssertFatalMsgFailed(("%RX64\n", uPde & X86_PDE_PAE_PG_MASK));
4847	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4848	}
4849	}
4850	}
4851	}
4852
4853
4854	/**
4855	* Clear references to shadowed pages in a PAE page directory pointer table.
4856	*
4857	* @param pPool The pool.
4858	* @param pPage The page.
4859	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4860	*/
4861	DECLINLINE(void) pgmPoolTrackDerefPDPTPae(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
4862	{
4863	for (unsigned i = 0; i < X86_PG_PAE_PDPE_ENTRIES; i++)
4864	{
4865	X86PGPAEUINT const uPdpe = pShwPDPT->a[i].u;
4866	Assert((uPdpe & (X86_PDPE_PAE_MBZ_MASK \| UINT64_C(0x7ff0000000000200))) == 0);
4867	if (uPdpe & X86_PDPE_P)
4868	{
4869	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPdpe & X86_PDPE_PG_MASK);
4870	if (pSubPage)
4871	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4872	else
4873	AssertFatalMsgFailed(("%RX64\n", uPdpe & X86_PDPE_PG_MASK));
4874	}
4875	}
4876	}
4877
4878
4879	/**
4880	* Clear references to shadowed pages in a 64-bit page directory pointer table.
4881	*
4882	* @param pPool The pool.
4883	* @param pPage The page.
4884	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4885	*/
4886	DECLINLINE(void) pgmPoolTrackDerefPDPT64Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PDPT pShwPDPT)
4887	{
4888	for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
4889	{
4890	X86PGPAEUINT const uPdpe = pShwPDPT->a[i].u;
4891	Assert((uPdpe & (X86_PDPE_LM_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000200))) == 0);
4892	if (uPdpe & X86_PDPE_P)
4893	{
4894	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPdpe & X86_PDPE_PG_MASK);
4895	if (pSubPage)
4896	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4897	else
4898	AssertFatalMsgFailed(("%RX64\n", uPdpe & X86_PDPE_PG_MASK));
4899	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4900	}
4901	}
4902	}
4903
4904
4905	/**
4906	* Clear references to shadowed pages in a 64-bit level 4 page table.
4907	*
4908	* @param pPool The pool.
4909	* @param pPage The page.
4910	* @param pShwPML4 The shadow page directory pointer table (mapping of the page).
4911	*/
4912	DECLINLINE(void) pgmPoolTrackDerefPML464Bit(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PX86PML4 pShwPML4)
4913	{
4914	for (unsigned i = 0; i < RT_ELEMENTS(pShwPML4->a); i++)
4915	{
4916	X86PGPAEUINT const uPml4e = pShwPML4->a[i].u;
4917	Assert((uPml4e & (X86_PML4E_MBZ_MASK_NX \| UINT64_C(0x7ff0000000000200))) == 0);
4918	if (uPml4e & X86_PML4E_P)
4919	{
4920	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPml4e & X86_PDPE_PG_MASK);
4921	if (pSubPage)
4922	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4923	else
4924	AssertFatalMsgFailed(("%RX64\n", uPml4e & X86_PML4E_PG_MASK));
4925	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4926	}
4927	}
4928	}
4929
4930
4931	/**
4932	* Clear references to shadowed pages in an EPT page directory.
4933	*
4934	* @param pPool The pool.
4935	* @param pPage The page.
4936	* @param pShwPD The shadow page directory (mapping of the page).
4937	*/
4938	DECLINLINE(void) pgmPoolTrackDerefPDEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPD pShwPD)
4939	{
4940	for (unsigned i = 0; i < RT_ELEMENTS(pShwPD->a); i++)
4941	{
4942	X86PGPAEUINT const uPde = pShwPD->a[i].u;
4943	#ifdef PGM_WITH_LARGE_PAGES
4944	AssertMsg((uPde & UINT64_C(0xfff0000000000f00)) == 0, ("uPde=%RX64\n", uPde));
4945	#else
4946	AssertMsg((uPde & UINT64_C(0xfff0000000000f80)) == 0, ("uPde=%RX64\n", uPde));
4947	#endif
4948	if (uPde & EPT_E_READ)
4949	{
4950	#ifdef PGM_WITH_LARGE_PAGES
4951	if (uPde & EPT_E_LEAF)
4952	{
4953	Log4(("pgmPoolTrackDerefPDEPT: i=%d pde=%RX64 GCPhys=%RX64\n",
4954	i, uPde & EPT_PDE2M_PG_MASK, pPage->GCPhys));
4955	pgmPoolTracDerefGCPhys(pPool, pPage, uPde & EPT_PDE2M_PG_MASK,
4956	pPage->GCPhys + i * 2 * _1M /* pPage->GCPhys = base address of the memory described by the PD */,
4957	i);
4958	}
4959	else
4960	#endif
4961	{
4962	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPde & EPT_PDE_PG_MASK);
4963	if (pSubPage)
4964	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4965	else
4966	AssertFatalMsgFailed(("%RX64\n", pShwPD->a[i].u & EPT_PDE_PG_MASK));
4967	}
4968	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4969	}
4970	}
4971	}
4972
4973
4974	/**
4975	* Clear references to shadowed pages in an EPT page directory pointer table.
4976	*
4977	* @param pPool The pool.
4978	* @param pPage The page.
4979	* @param pShwPDPT The shadow page directory pointer table (mapping of the page).
4980	*/
4981	DECLINLINE(void) pgmPoolTrackDerefPDPTEPT(PPGMPOOL pPool, PPGMPOOLPAGE pPage, PEPTPDPT pShwPDPT)
4982	{
4983	for (unsigned i = 0; i < RT_ELEMENTS(pShwPDPT->a); i++)
4984	{
4985	X86PGPAEUINT const uPdpe = pShwPDPT->a[i].u;
4986	Assert((uPdpe & UINT64_C(0xfff0000000000f80)) == 0);
4987	if (uPdpe & EPT_E_READ)
4988	{
4989	PPGMPOOLPAGE pSubPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, uPdpe & EPT_PDPTE_PG_MASK);
4990	if (pSubPage)
4991	pgmPoolTrackFreeUser(pPool, pSubPage, pPage->idx, i);
4992	else
4993	AssertFatalMsgFailed(("%RX64\n", uPdpe & EPT_PDPTE_PG_MASK));
4994	/** @todo 64-bit guests: have to ensure that we're not exhausting the dynamic mappings! */
4995	}
4996	}
4997	}
4998
4999
5000	/**
5001	* Clears all references made by this page.
5002	*
5003	* This includes other shadow pages and GC physical addresses.
5004	*
5005	* @param pPool The pool.
5006	* @param pPage The page.
5007	*/
5008	static void pgmPoolTrackDeref(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
5009	{
5010	/*
5011	* Map the shadow page and take action according to the page kind.
5012	*/
5013	PVMCC pVM = pPool->CTX_SUFF(pVM);
5014	void *pvShw = PGMPOOL_PAGE_2_PTR(pVM, pPage);
5015	switch (pPage->enmKind)
5016	{
5017	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
5018	{
5019	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
5020	void *pvGst;
5021	int rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
5022	pgmPoolTrackDerefPT32Bit32Bit(pPool, pPage, (PX86PT)pvShw, (PCX86PT)pvGst);
5023	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
5024	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
5025	break;
5026	}
5027
5028	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
5029	{
5030	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
5031	void *pvGst;
5032	int rc = PGM_GCPHYS_2_PTR_EX(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
5033	pgmPoolTrackDerefPTPae32Bit(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PT)pvGst);
5034	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
5035	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
5036	break;
5037	}
5038
5039	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
5040	{
5041	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
5042	void *pvGst;
5043	int rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
5044	pgmPoolTrackDerefPTPaePae(pPool, pPage, (PPGMSHWPTPAE)pvShw, (PCX86PTPAE)pvGst);
5045	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvGst);
5046	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
5047	break;
5048	}
5049
5050	case PGMPOOLKIND_32BIT_PT_FOR_PHYS: /* treat it like a 4 MB page */
5051	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
5052	{
5053	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
5054	pgmPoolTrackDerefPT32Bit4MB(pPool, pPage, (PX86PT)pvShw);
5055	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
5056	break;
5057	}
5058
5059	case PGMPOOLKIND_PAE_PT_FOR_PHYS: /* treat it like a 2 MB page */
5060	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
5061	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
5062	{
5063	STAM_PROFILE_START(&pPool->StatTrackDerefGCPhys, g);
5064	pgmPoolTrackDerefPTPaeBig(pPool, pPage, (PPGMSHWPTPAE)pvShw);
5065	STAM_PROFILE_STOP(&pPool->StatTrackDerefGCPhys, g);
5066	break;
5067	}
5068
5069	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
5070	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
5071	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
5072	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
5073	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
5074	case PGMPOOLKIND_PAE_PD_PHYS:
5075	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
5076	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
5077	pgmPoolTrackDerefPDPae(pPool, pPage, (PX86PDPAE)pvShw);
5078	break;
5079
5080	case PGMPOOLKIND_32BIT_PD_PHYS:
5081	case PGMPOOLKIND_32BIT_PD:
5082	pgmPoolTrackDerefPD(pPool, pPage, (PX86PD)pvShw);
5083	break;
5084
5085	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
5086	case PGMPOOLKIND_PAE_PDPT:
5087	case PGMPOOLKIND_PAE_PDPT_PHYS:
5088	pgmPoolTrackDerefPDPTPae(pPool, pPage, (PX86PDPT)pvShw);
5089	break;
5090
5091	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
5092	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
5093	pgmPoolTrackDerefPDPT64Bit(pPool, pPage, (PX86PDPT)pvShw);
5094	break;
5095
5096	case PGMPOOLKIND_64BIT_PML4:
5097	pgmPoolTrackDerefPML464Bit(pPool, pPage, (PX86PML4)pvShw);
5098	break;
5099
5100	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
5101	pgmPoolTrackDerefPTEPT(pPool, pPage, (PEPTPT)pvShw);
5102	break;
5103
5104	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
5105	pgmPoolTrackDerefPDEPT(pPool, pPage, (PEPTPD)pvShw);
5106	break;
5107
5108	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
5109	pgmPoolTrackDerefPDPTEPT(pPool, pPage, (PEPTPDPT)pvShw);
5110	break;
5111
5112	#ifdef VBOX_WITH_NESTED_HWVIRT_VMX_EPT
5113	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
5114	{
5115	void *pvGst;
5116	int const rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
5117	pgmPoolTrackDerefNestedPTEPT(pPool, pPage, (PEPTPT)pvShw, (PCEPTPT)pvGst);
5118	break;
5119	}
5120
5121	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
5122	pgmPoolTrackDerefNestedPTEPT2MB(pPool, pPage, (PEPTPT)pvShw);
5123	break;
5124
5125	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
5126	{
5127	void *pvGst;
5128	int const rc = PGM_GCPHYS_2_PTR(pVM, pPage->GCPhys, &pvGst); AssertReleaseRC(rc);
5129	pgmPoolTrackDerefNestedPDEpt(pPool, pPage, (PEPTPD)pvShw, (PCEPTPD)pvGst);
5130	break;
5131	}
5132
5133	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
5134	pgmPoolTrackDerefPDPTEPT(pPool, pPage, (PEPTPDPT)pvShw);
5135	break;
5136	#endif
5137
5138	default:
5139	AssertFatalMsgFailed(("enmKind=%d GCPhys=%RGp\n", pPage->enmKind, pPage->GCPhys));
5140	}
5141
5142	/* paranoia, clear the shadow page. Remove this laser (i.e. let Alloc and ClearAll do it). */
5143	STAM_PROFILE_START(&pPool->StatZeroPage, z);
5144	ASMMemZeroPage(pvShw);
5145	STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
5146	pPage->fZeroed = true;
5147	Assert(!pPage->cPresent);
5148	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pvShw);
5149	}
5150
5151
5152	/**
5153	* Flushes a pool page.
5154	*
5155	* This moves the page to the free list after removing all user references to it.
5156	*
5157	* @returns VBox status code.
5158	* @retval VINF_SUCCESS on success.
5159	* @param pPool The pool.
5160	* @param pPage The shadow page.
5161	* @param fFlush Flush the TLBS when required (should only be false in very specific use cases!!)
5162	*/
5163	int pgmPoolFlushPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, bool fFlush)
5164	{
5165	PVMCC pVM = pPool->CTX_SUFF(pVM);
5166	bool fFlushRequired = false;
5167
5168	int rc = VINF_SUCCESS;
5169	STAM_PROFILE_START(&pPool->StatFlushPage, f);
5170	LogFlow(("pgmPoolFlushPage: pPage=%p:{.Key=%RHp, .idx=%d, .enmKind=%s, .GCPhys=%RGp}\n",
5171	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
5172
5173	if (PGMPOOL_PAGE_IS_NESTED(pPage))
5174	Log7Func(("pPage=%p:{.Key=%RHp, .idx=%d, .enmKind=%s, .GCPhys=%RGp}\n",
5175	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), pPage->GCPhys));
5176
5177	/*
5178	* Reject any attempts at flushing any of the special root pages (shall
5179	* not happen).
5180	*/
5181	AssertMsgReturn(pPage->idx >= PGMPOOL_IDX_FIRST,
5182	("pgmPoolFlushPage: special root page, rejected. enmKind=%s idx=%d\n",
5183	pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx),
5184	VINF_SUCCESS);
5185
5186	PGM_LOCK_VOID(pVM);
5187
5188	/*
5189	* Quietly reject any attempts at flushing the currently active shadow CR3 mapping
5190	*/
5191	if (pgmPoolIsPageLocked(pPage))
5192	{
5193	#if !defined(VBOX_VMM_TARGET_ARMV8)
5194	AssertMsg( pPage->enmKind == PGMPOOLKIND_64BIT_PML4
5195	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PDPT
5196	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PDPT_FOR_32BIT
5197	\|\| pPage->enmKind == PGMPOOLKIND_32BIT_PD
5198	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD_FOR_PAE_PD
5199	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD
5200	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD
5201	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD
5202	\|\| pPage->enmKind == PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD
5203	\|\| pPage->enmKind == PGMPOOLKIND_ROOT_NESTED,
5204	("Can't free the shadow CR3! (%RHp vs %RHp kind=%d\n", PGMGetHyperCR3(VMMGetCpu(pVM)), pPage->Core.Key, pPage->enmKind));
5205	#endif
5206	Log(("pgmPoolFlushPage: current active shadow CR3, rejected. enmKind=%s idx=%d\n", pgmPoolPoolKindToStr(pPage->enmKind), pPage->idx));
5207	PGM_UNLOCK(pVM);
5208	return VINF_SUCCESS;
5209	}
5210
5211	/*
5212	* Mark the page as being in need of an ASMMemZeroPage().
5213	*/
5214	pPage->fZeroed = false;
5215
5216	#ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5217	if (pPage->fDirty)
5218	pgmPoolFlushDirtyPage(pVM, pPool, pPage->idxDirtyEntry, false /* do not remove */);
5219	#endif
5220
5221	/* If there are any users of this table, then we must issue a tlb flush on all VCPUs. */
5222	if (pPage->iUserHead != NIL_PGMPOOL_USER_INDEX)
5223	fFlushRequired = true;
5224
5225	/*
5226	* Clear the page.
5227	*/
5228	pgmPoolTrackClearPageUsers(pPool, pPage);
5229	STAM_PROFILE_START(&pPool->StatTrackDeref,a);
5230	pgmPoolTrackDeref(pPool, pPage);
5231	STAM_PROFILE_STOP(&pPool->StatTrackDeref,a);
5232
5233	/*
5234	* Flush it from the cache.
5235	*/
5236	pgmPoolCacheFlushPage(pPool, pPage);
5237
5238	/*
5239	* Deregistering the monitoring.
5240	*/
5241	if (pPage->fMonitored)
5242	rc = pgmPoolMonitorFlush(pPool, pPage);
5243
5244	/*
5245	* Free the page.
5246	*/
5247	Assert(pPage->iNext == NIL_PGMPOOL_IDX);
5248	pPage->iNext = pPool->iFreeHead;
5249	pPool->iFreeHead = pPage->idx;
5250	pPage->enmKind = PGMPOOLKIND_FREE;
5251	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5252	pPage->GCPhys = NIL_RTGCPHYS;
5253	pPage->fReusedFlushPending = false;
5254
5255	pPool->cUsedPages--;
5256
5257	/* Flush the TLBs of all VCPUs if required. */
5258	if ( fFlushRequired
5259	&& fFlush)
5260	{
5261	PGM_INVL_ALL_VCPU_TLBS(pVM);
5262	}
5263
5264	PGM_UNLOCK(pVM);
5265	STAM_PROFILE_STOP(&pPool->StatFlushPage, f);
5266	return rc;
5267	}
5268
5269
5270	/**
5271	* Frees a usage of a pool page.
5272	*
5273	* The caller is responsible to updating the user table so that it no longer
5274	* references the shadow page.
5275	*
5276	* @param pPool The pool.
5277	* @param pPage The shadow page.
5278	* @param iUser The shadow page pool index of the user table.
5279	* NIL_PGMPOOL_IDX for root pages.
5280	* @param iUserTable The index into the user table (shadowed). Ignored if
5281	* root page.
5282	*/
5283	void pgmPoolFreeByPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage, uint16_t iUser, uint32_t iUserTable)
5284	{
5285	PVMCC pVM = pPool->CTX_SUFF(pVM);
5286
5287	STAM_PROFILE_START(&pPool->StatFree, a);
5288	LogFlow(("pgmPoolFreeByPage: pPage=%p:{.Key=%RHp, .idx=%d, enmKind=%s} iUser=%d iUserTable=%#x\n",
5289	pPage, pPage->Core.Key, pPage->idx, pgmPoolPoolKindToStr(pPage->enmKind), iUser, iUserTable));
5290	AssertReturnVoid(pPage->idx >= PGMPOOL_IDX_FIRST); /* paranoia (#6349) */
5291
5292	PGM_LOCK_VOID(pVM);
5293	if (iUser != NIL_PGMPOOL_IDX)
5294	pgmPoolTrackFreeUser(pPool, pPage, iUser, iUserTable);
5295	if (!pPage->fCached)
5296	pgmPoolFlushPage(pPool, pPage);
5297	PGM_UNLOCK(pVM);
5298	STAM_PROFILE_STOP(&pPool->StatFree, a);
5299	}
5300
5301
5302	/**
5303	* Makes one or more free page free.
5304	*
5305	* @returns VBox status code.
5306	* @retval VINF_SUCCESS on success.
5307	*
5308	* @param pPool The pool.
5309	* @param enmKind Page table kind
5310	* @param iUser The user of the page.
5311	*/
5312	static int pgmPoolMakeMoreFreePages(PPGMPOOL pPool, PGMPOOLKIND enmKind, uint16_t iUser)
5313	{
5314	PVMCC pVM = pPool->CTX_SUFF(pVM);
5315	LogFlow(("pgmPoolMakeMoreFreePages: enmKind=%d iUser=%d\n", enmKind, iUser));
5316	NOREF(enmKind);
5317
5318	/*
5319	* If the pool isn't full grown yet, expand it.
5320	*/
5321	if (pPool->cCurPages < pPool->cMaxPages)
5322	{
5323	STAM_PROFILE_ADV_SUSPEND(&pPool->StatAlloc, a);
5324	#ifdef IN_RING3
5325	int rc = PGMR3PoolGrow(pVM, VMMGetCpu(pVM));
5326	#else
5327	int rc = PGMR0PoolGrow(pVM, VMMGetCpuId(pVM));
5328	#endif
5329	if (RT_FAILURE(rc))
5330	return rc;
5331	STAM_PROFILE_ADV_RESUME(&pPool->StatAlloc, a);
5332	if (pPool->iFreeHead != NIL_PGMPOOL_IDX)
5333	return VINF_SUCCESS;
5334	}
5335
5336	/*
5337	* Free one cached page.
5338	*/
5339	return pgmPoolCacheFreeOne(pPool, iUser);
5340	}
5341
5342
5343	/**
5344	* Allocates a page from the pool.
5345	*
5346	* This page may actually be a cached page and not in need of any processing
5347	* on the callers part.
5348	*
5349	* @returns VBox status code.
5350	* @retval VINF_SUCCESS if a NEW page was allocated.
5351	* @retval VINF_PGM_CACHED_PAGE if a CACHED page was returned.
5352	*
5353	* @param pVM The cross context VM structure.
5354	* @param GCPhys The GC physical address of the page we're gonna shadow.
5355	* For 4MB and 2MB PD entries, it's the first address the
5356	* shadow PT is covering.
5357	* @param enmKind The kind of mapping.
5358	* @param enmAccess Access type for the mapping (only relevant for big pages)
5359	* @param fA20Enabled Whether the A20 gate is enabled or not.
5360	* @param iUser The shadow page pool index of the user table. Root
5361	* pages should pass NIL_PGMPOOL_IDX.
5362	* @param iUserTable The index into the user table (shadowed). Ignored for
5363	* root pages (iUser == NIL_PGMPOOL_IDX).
5364	* @param fLockPage Lock the page
5365	* @param ppPage Where to store the pointer to the page. NULL is stored here on failure.
5366	*/
5367	int pgmPoolAlloc(PVMCC pVM, RTGCPHYS GCPhys, PGMPOOLKIND enmKind, PGMPOOLACCESS enmAccess, bool fA20Enabled,
5368	uint16_t iUser, uint32_t iUserTable, bool fLockPage, PPPGMPOOLPAGE ppPage)
5369	{
5370	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5371	STAM_PROFILE_ADV_START(&pPool->StatAlloc, a);
5372	LogFlow(("pgmPoolAlloc: GCPhys=%RGp enmKind=%s iUser=%d iUserTable=%#x\n", GCPhys, pgmPoolPoolKindToStr(enmKind), iUser, iUserTable));
5373	*ppPage = NULL;
5374	/** @todo CSAM/PGMPrefetchPage messes up here during CSAMR3CheckGates
5375	* (TRPMR3SyncIDT) because of FF priority. Try fix that?
5376	* Assert(!(pVM->pgm.s.fGlobalSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)); */
5377
5378	#if defined(VBOX_STRICT) && defined(VBOX_WITH_NESTED_HWVIRT_VMX_EPT)
5379	PVMCPUCC pVCpu = VMMGetCpu(pVM);
5380	Assert(pVCpu->pgm.s.enmGuestSlatMode == PGMSLAT_DIRECT \|\| PGMPOOL_PAGE_IS_KIND_NESTED(enmKind));
5381	#endif
5382
5383	PGM_LOCK_VOID(pVM);
5384
5385	if (pPool->fCacheEnabled)
5386	{
5387	int rc2 = pgmPoolCacheAlloc(pPool, GCPhys, enmKind, enmAccess, fA20Enabled, iUser, iUserTable, ppPage);
5388	if (RT_SUCCESS(rc2))
5389	{
5390	if (fLockPage)
5391	pgmPoolLockPage(pPool, *ppPage);
5392	PGM_UNLOCK(pVM);
5393	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5394	LogFlow(("pgmPoolAlloc: cached returns %Rrc ppPage=%p:{.Key=%RHp, .idx=%d}\n", rc2, ppPage, (ppPage)->Core.Key, (ppPage)->idx));
5395	return rc2;
5396	}
5397	}
5398
5399	/*
5400	* Allocate a new one.
5401	*/
5402	int rc = VINF_SUCCESS;
5403	uint16_t iNew = pPool->iFreeHead;
5404	if (iNew == NIL_PGMPOOL_IDX)
5405	{
5406	rc = pgmPoolMakeMoreFreePages(pPool, enmKind, iUser);
5407	if (RT_FAILURE(rc))
5408	{
5409	PGM_UNLOCK(pVM);
5410	Log(("pgmPoolAlloc: returns %Rrc (Free)\n", rc));
5411	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5412	return rc;
5413	}
5414	iNew = pPool->iFreeHead;
5415	AssertReleaseMsgReturn(iNew != NIL_PGMPOOL_IDX, ("iNew=%#x\n", iNew), VERR_PGM_POOL_IPE);
5416	}
5417
5418	/* unlink the free head */
5419	PPGMPOOLPAGE pPage = &pPool->aPages[iNew];
5420	pPool->iFreeHead = pPage->iNext;
5421	pPage->iNext = NIL_PGMPOOL_IDX;
5422
5423	/*
5424	* Initialize it.
5425	*/
5426	pPool->cUsedPages++; /* physical handler registration / pgmPoolTrackFlushGCPhysPTsSlow requirement. */
5427	pPage->enmKind = enmKind;
5428	pPage->enmAccess = enmAccess;
5429	pPage->GCPhys = GCPhys;
5430	pPage->fA20Enabled = fA20Enabled;
5431	pPage->fSeenNonGlobal = false; /* Set this to 'true' to disable this feature. */
5432	pPage->fMonitored = false;
5433	pPage->fCached = false;
5434	pPage->fDirty = false;
5435	pPage->fReusedFlushPending = false;
5436	pPage->cModifications = 0;
5437	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
5438	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
5439	pPage->cPresent = 0;
5440	pPage->iFirstPresent = NIL_PGMPOOL_PRESENT_INDEX;
5441	pPage->idxDirtyEntry = 0;
5442	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
5443	pPage->GCPtrLastAccessHandlerRip = NIL_RTGCPTR;
5444	pPage->cLastAccessHandler = 0;
5445	pPage->cLocked = 0;
5446	# ifdef VBOX_STRICT
5447	pPage->GCPtrDirtyFault = NIL_RTGCPTR;
5448	# endif
5449
5450	/*
5451	* Insert into the tracking and cache. If this fails, free the page.
5452	*/
5453	int rc3 = pgmPoolTrackInsert(pPool, pPage, GCPhys, iUser, iUserTable);
5454	if (RT_FAILURE(rc3))
5455	{
5456	pPool->cUsedPages--;
5457	pPage->enmKind = PGMPOOLKIND_FREE;
5458	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5459	pPage->GCPhys = NIL_RTGCPHYS;
5460	pPage->iNext = pPool->iFreeHead;
5461	pPool->iFreeHead = pPage->idx;
5462	PGM_UNLOCK(pVM);
5463	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5464	Log(("pgmPoolAlloc: returns %Rrc (Insert)\n", rc3));
5465	return rc3;
5466	}
5467
5468	/*
5469	* Commit the allocation, clear the page and return.
5470	*/
5471	#ifdef VBOX_WITH_STATISTICS
5472	if (pPool->cUsedPages > pPool->cUsedPagesHigh)
5473	pPool->cUsedPagesHigh = pPool->cUsedPages;
5474	#endif
5475
5476	if (!pPage->fZeroed)
5477	{
5478	STAM_PROFILE_START(&pPool->StatZeroPage, z);
5479	void *pv = PGMPOOL_PAGE_2_PTR(pVM, pPage);
5480	ASMMemZeroPage(pv);
5481	STAM_PROFILE_STOP(&pPool->StatZeroPage, z);
5482	}
5483
5484	*ppPage = pPage;
5485	if (fLockPage)
5486	pgmPoolLockPage(pPool, pPage);
5487	PGM_UNLOCK(pVM);
5488	LogFlow(("pgmPoolAlloc: returns %Rrc *ppPage=%p:{.Key=%RHp, .idx=%d, .fCached=%RTbool, .fMonitored=%RTbool}\n",
5489	rc, pPage, pPage->Core.Key, pPage->idx, pPage->fCached, pPage->fMonitored));
5490	STAM_PROFILE_ADV_STOP(&pPool->StatAlloc, a);
5491	return rc;
5492	}
5493
5494
5495	/**
5496	* Frees a usage of a pool page.
5497	*
5498	* @param pVM The cross context VM structure.
5499	* @param HCPhys The HC physical address of the shadow page.
5500	* @param iUser The shadow page pool index of the user table.
5501	* NIL_PGMPOOL_IDX if root page.
5502	* @param iUserTable The index into the user table (shadowed). Ignored if
5503	* root page.
5504	*/
5505	void pgmPoolFree(PVM pVM, RTHCPHYS HCPhys, uint16_t iUser, uint32_t iUserTable)
5506	{
5507	LogFlow(("pgmPoolFree: HCPhys=%RHp iUser=%d iUserTable=%#x\n", HCPhys, iUser, iUserTable));
5508	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5509	pgmPoolFreeByPage(pPool, pgmPoolGetPage(pPool, HCPhys), iUser, iUserTable);
5510	}
5511
5512
5513	/**
5514	* Internal worker for finding a 'in-use' shadow page give by it's physical address.
5515	*
5516	* @returns Pointer to the shadow page structure.
5517	* @param pPool The pool.
5518	* @param HCPhys The HC physical address of the shadow page.
5519	*/
5520	PPGMPOOLPAGE pgmPoolGetPage(PPGMPOOL pPool, RTHCPHYS HCPhys)
5521	{
5522	PGM_LOCK_ASSERT_OWNER(pPool->CTX_SUFF(pVM));
5523
5524	/*
5525	* Look up the page.
5526	*/
5527	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
5528
5529	AssertFatalMsg(pPage && pPage->enmKind != PGMPOOLKIND_FREE, ("HCPhys=%RHp pPage=%p idx=%d\n", HCPhys, pPage, (pPage) ? pPage->idx : 0));
5530	return pPage;
5531	}
5532
5533
5534	/**
5535	* Internal worker for finding a page for debugging purposes, no assertions.
5536	*
5537	* @returns Pointer to the shadow page structure. NULL on if not found.
5538	* @param pPool The pool.
5539	* @param HCPhys The HC physical address of the shadow page.
5540	*/
5541	PPGMPOOLPAGE pgmPoolQueryPageForDbg(PPGMPOOL pPool, RTHCPHYS HCPhys)
5542	{
5543	PGM_LOCK_ASSERT_OWNER(pPool->CTX_SUFF(pVM));
5544	return (PPGMPOOLPAGE)RTAvloHCPhysGet(&pPool->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
5545	}
5546
5547
5548	/**
5549	* Internal worker for PGM_HCPHYS_2_PTR.
5550	*
5551	* @returns VBox status code.
5552	* @param pVM The cross context VM structure.
5553	* @param HCPhys The HC physical address of the shadow page.
5554	* @param ppv Where to return the address.
5555	*/
5556	int pgmPoolHCPhys2Ptr(PVM pVM, RTHCPHYS HCPhys, void **ppv)
5557	{
5558	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)RTAvloHCPhysGet(&pVM->pgm.s.CTX_SUFF(pPool)->HCPhysTree, HCPhys & X86_PTE_PAE_PG_MASK);
5559	AssertMsgReturn(pPage && pPage->enmKind != PGMPOOLKIND_FREE,
5560	("HCPhys=%RHp pPage=%p idx=%d\n", HCPhys, pPage, (pPage) ? pPage->idx : 0),
5561	VERR_PGM_POOL_GET_PAGE_FAILED);
5562	ppv = (uint8_t )pPage->CTX_SUFF(pvPage) + (HCPhys & PAGE_OFFSET_MASK);
5563	return VINF_SUCCESS;
5564	}
5565
5566	#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) */
5567
5568	/**
5569	* Flush the specified page if present
5570	*
5571	* @param pVM The cross context VM structure.
5572	* @param GCPhys Guest physical address of the page to flush
5573	*/
5574	void pgmPoolFlushPageByGCPhys(PVM pVM, RTGCPHYS GCPhys)
5575	{
5576	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5577
5578	VM_ASSERT_EMT(pVM);
5579
5580	/*
5581	* Look up the GCPhys in the hash.
5582	*/
5583	GCPhys = GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
5584	unsigned i = pPool->aiHash[PGMPOOL_HASH(GCPhys)];
5585	if (i == NIL_PGMPOOL_IDX)
5586	return;
5587
5588	do
5589	{
5590	PPGMPOOLPAGE pPage = &pPool->aPages[i];
5591	if (pPage->GCPhys - GCPhys < PAGE_SIZE)
5592	{
5593	Assert(!PGMPOOL_PAGE_IS_NESTED(pPage)); /* Temporary to see if it hits. Remove later. */
5594	switch (pPage->enmKind)
5595	{
5596	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
5597	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
5598	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
5599	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
5600	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
5601	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
5602	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
5603	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
5604	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
5605	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
5606	case PGMPOOLKIND_64BIT_PML4:
5607	case PGMPOOLKIND_32BIT_PD:
5608	case PGMPOOLKIND_PAE_PDPT:
5609	{
5610	Log(("PGMPoolFlushPage: found pgm pool pages for %RGp\n", GCPhys));
5611	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5612	if (pPage->fDirty)
5613	STAM_COUNTER_INC(&pPool->StatForceFlushDirtyPage);
5614	else
5615	# endif
5616	STAM_COUNTER_INC(&pPool->StatForceFlushPage);
5617	Assert(!pgmPoolIsPageLocked(pPage));
5618	pgmPoolMonitorChainFlush(pPool, pPage);
5619	return;
5620	}
5621
5622	/* ignore, no monitoring. */
5623	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
5624	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
5625	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
5626	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
5627	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
5628	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
5629	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
5630	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
5631	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
5632	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
5633	case PGMPOOLKIND_ROOT_NESTED:
5634	case PGMPOOLKIND_PAE_PD_PHYS:
5635	case PGMPOOLKIND_PAE_PDPT_PHYS:
5636	case PGMPOOLKIND_32BIT_PD_PHYS:
5637	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
5638	break;
5639
5640	default:
5641	AssertFatalMsgFailed(("enmKind=%d idx=%d\n", pPage->enmKind, pPage->idx));
5642	}
5643	}
5644
5645	/* next */
5646	i = pPage->iNext;
5647	} while (i != NIL_PGMPOOL_IDX);
5648	return;
5649	}
5650
5651
5652	/**
5653	* Reset CPU on hot plugging.
5654	*
5655	* @param pVM The cross context VM structure.
5656	* @param pVCpu The cross context virtual CPU structure.
5657	*/
5658	void pgmR3PoolResetUnpluggedCpu(PVM pVM, PVMCPU pVCpu)
5659	{
5660	pgmR3ExitShadowModeBeforePoolFlush(pVCpu);
5661
5662	pgmR3ReEnterShadowModeAfterPoolFlush(pVM, pVCpu);
5663	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
5664	VMCPU_FF_SET(pVCpu, VMCPU_FF_TLB_FLUSH);
5665	}
5666
5667
5668	/**
5669	* Flushes the entire cache.
5670	*
5671	* It will assert a global CR3 flush (FF) and assumes the caller is aware of
5672	* this and execute this CR3 flush.
5673	*
5674	* @param pVM The cross context VM structure.
5675	*/
5676	void pgmR3PoolReset(PVM pVM)
5677	{
5678	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
5679
5680	PGM_LOCK_ASSERT_OWNER(pVM);
5681	STAM_PROFILE_START(&pPool->StatR3Reset, a);
5682	LogFlow(("pgmR3PoolReset:\n"));
5683
5684	/*
5685	* If there are no pages in the pool, there is nothing to do.
5686	*/
5687	if (pPool->cCurPages <= PGMPOOL_IDX_FIRST)
5688	{
5689	STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
5690	return;
5691	}
5692
5693	/*
5694	* Exit the shadow mode since we're going to clear everything,
5695	* including the root page.
5696	*/
5697	VMCC_FOR_EACH_VMCPU(pVM)
5698	pgmR3ExitShadowModeBeforePoolFlush(pVCpu);
5699	VMCC_FOR_EACH_VMCPU_END(pVM);
5700
5701
5702	/*
5703	* Nuke the free list and reinsert all pages into it.
5704	*/
5705	for (unsigned i = pPool->cCurPages - 1; i >= PGMPOOL_IDX_FIRST; i--)
5706	{
5707	PPGMPOOLPAGE pPage = &pPool->aPages[i];
5708
5709	if (pPage->fMonitored)
5710	pgmPoolMonitorFlush(pPool, pPage);
5711	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
5712	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
5713	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
5714	pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
5715	pPage->GCPhys = NIL_RTGCPHYS;
5716	pPage->enmKind = PGMPOOLKIND_FREE;
5717	pPage->enmAccess = PGMPOOLACCESS_DONTCARE;
5718	Assert(pPage->idx == i);
5719	pPage->iNext = i + 1;
5720	pPage->fA20Enabled = true;
5721	pPage->fZeroed = false; /* This could probably be optimized, but better safe than sorry. */
5722	pPage->fSeenNonGlobal = false;
5723	pPage->fMonitored = false;
5724	pPage->fDirty = false;
5725	pPage->fCached = false;
5726	pPage->fReusedFlushPending = false;
5727	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
5728	pPage->cPresent = 0;
5729	pPage->iFirstPresent = NIL_PGMPOOL_PRESENT_INDEX;
5730	pPage->cModifications = 0;
5731	pPage->iAgeNext = NIL_PGMPOOL_IDX;
5732	pPage->iAgePrev = NIL_PGMPOOL_IDX;
5733	pPage->idxDirtyEntry = 0;
5734	pPage->GCPtrLastAccessHandlerRip = NIL_RTGCPTR;
5735	pPage->GCPtrLastAccessHandlerFault = NIL_RTGCPTR;
5736	pPage->cLastAccessHandler = 0;
5737	pPage->cLocked = 0;
5738	# ifdef VBOX_STRICT
5739	pPage->GCPtrDirtyFault = NIL_RTGCPTR;
5740	# endif
5741	}
5742	pPool->aPages[pPool->cCurPages - 1].iNext = NIL_PGMPOOL_IDX;
5743	pPool->iFreeHead = PGMPOOL_IDX_FIRST;
5744	pPool->cUsedPages = 0;
5745
5746	/*
5747	* Zap and reinitialize the user records.
5748	*/
5749	pPool->cPresent = 0;
5750	pPool->iUserFreeHead = 0;
5751	PPGMPOOLUSER paUsers = pPool->CTX_SUFF(paUsers);
5752	const unsigned cMaxUsers = pPool->cMaxUsers;
5753	for (unsigned i = 0; i < cMaxUsers; i++)
5754	{
5755	paUsers[i].iNext = i + 1;
5756	paUsers[i].iUser = NIL_PGMPOOL_IDX;
5757	paUsers[i].iUserTable = 0xfffffffe;
5758	}
5759	paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
5760
5761	/*
5762	* Clear all the GCPhys links and rebuild the phys ext free list.
5763	*/
5764	for (PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRangesX);
5765	pRam;
5766	pRam = pRam->CTX_SUFF(pNext))
5767	{
5768	unsigned iPage = pRam->cb >> PAGE_SHIFT;
5769	while (iPage-- > 0)
5770	PGM_PAGE_SET_TRACKING(pVM, &pRam->aPages[iPage], 0);
5771	}
5772
5773	pPool->iPhysExtFreeHead = 0;
5774	PPGMPOOLPHYSEXT paPhysExts = pPool->CTX_SUFF(paPhysExts);
5775	const unsigned cMaxPhysExts = pPool->cMaxPhysExts;
5776	for (unsigned i = 0; i < cMaxPhysExts; i++)
5777	{
5778	paPhysExts[i].iNext = i + 1;
5779	paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
5780	paPhysExts[i].apte[0] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5781	paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
5782	paPhysExts[i].apte[1] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5783	paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
5784	paPhysExts[i].apte[2] = NIL_PGMPOOL_PHYSEXT_IDX_PTE;
5785	}
5786	paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
5787
5788	/*
5789	* Just zap the modified list.
5790	*/
5791	pPool->cModifiedPages = 0;
5792	pPool->iModifiedHead = NIL_PGMPOOL_IDX;
5793
5794	/*
5795	* Clear the GCPhys hash and the age list.
5796	*/
5797	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aiHash); i++)
5798	pPool->aiHash[i] = NIL_PGMPOOL_IDX;
5799	pPool->iAgeHead = NIL_PGMPOOL_IDX;
5800	pPool->iAgeTail = NIL_PGMPOOL_IDX;
5801
5802	# ifdef PGMPOOL_WITH_OPTIMIZED_DIRTY_PT
5803	/* Clear all dirty pages. */
5804	pPool->idxFreeDirtyPage = 0;
5805	pPool->cDirtyPages = 0;
5806	for (unsigned i = 0; i < RT_ELEMENTS(pPool->aidxDirtyPages); i++)
5807	pPool->aidxDirtyPages[i] = NIL_PGMPOOL_IDX;
5808	# endif
5809
5810	/*
5811	* Reinsert active pages into the hash and ensure monitoring chains are correct.
5812	*/
5813	VMCC_FOR_EACH_VMCPU(pVM)
5814	{
5815	/*
5816	* Re-enter the shadowing mode and assert Sync CR3 FF.
5817	*/
5818	pgmR3ReEnterShadowModeAfterPoolFlush(pVM, pVCpu);
5819	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
5820	VMCPU_FF_SET(pVCpu, VMCPU_FF_TLB_FLUSH);
5821	}
5822	VMCC_FOR_EACH_VMCPU_END(pVM);
5823
5824	STAM_PROFILE_STOP(&pPool->StatR3Reset, a);
5825	}
5826
5827	#endif /* IN_RING3 */
5828
5829	#if defined(LOG_ENABLED) \|\| defined(VBOX_STRICT)
5830	/**
5831	* Stringifies a PGMPOOLKIND value.
5832	*/
5833	static const char *pgmPoolPoolKindToStr(uint8_t enmKind)
5834	{
5835	switch ((PGMPOOLKIND)enmKind)
5836	{
5837	case PGMPOOLKIND_INVALID:
5838	return "PGMPOOLKIND_INVALID";
5839	case PGMPOOLKIND_FREE:
5840	return "PGMPOOLKIND_FREE";
5841	case PGMPOOLKIND_32BIT_PT_FOR_PHYS:
5842	return "PGMPOOLKIND_32BIT_PT_FOR_PHYS";
5843	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT:
5844	return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_PT";
5845	case PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB:
5846	return "PGMPOOLKIND_32BIT_PT_FOR_32BIT_4MB";
5847	case PGMPOOLKIND_PAE_PT_FOR_PHYS:
5848	return "PGMPOOLKIND_PAE_PT_FOR_PHYS";
5849	case PGMPOOLKIND_PAE_PT_FOR_32BIT_PT:
5850	return "PGMPOOLKIND_PAE_PT_FOR_32BIT_PT";
5851	case PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB:
5852	return "PGMPOOLKIND_PAE_PT_FOR_32BIT_4MB";
5853	case PGMPOOLKIND_PAE_PT_FOR_PAE_PT:
5854	return "PGMPOOLKIND_PAE_PT_FOR_PAE_PT";
5855	case PGMPOOLKIND_PAE_PT_FOR_PAE_2MB:
5856	return "PGMPOOLKIND_PAE_PT_FOR_PAE_2MB";
5857	case PGMPOOLKIND_32BIT_PD:
5858	return "PGMPOOLKIND_32BIT_PD";
5859	case PGMPOOLKIND_32BIT_PD_PHYS:
5860	return "PGMPOOLKIND_32BIT_PD_PHYS";
5861	case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
5862	return "PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD";
5863	case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
5864	return "PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD";
5865	case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
5866	return "PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD";
5867	case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
5868	return "PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD";
5869	case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
5870	return "PGMPOOLKIND_PAE_PD_FOR_PAE_PD";
5871	case PGMPOOLKIND_PAE_PD_PHYS:
5872	return "PGMPOOLKIND_PAE_PD_PHYS";
5873	case PGMPOOLKIND_PAE_PDPT_FOR_32BIT:
5874	return "PGMPOOLKIND_PAE_PDPT_FOR_32BIT";
5875	case PGMPOOLKIND_PAE_PDPT:
5876	return "PGMPOOLKIND_PAE_PDPT";
5877	case PGMPOOLKIND_PAE_PDPT_PHYS:
5878	return "PGMPOOLKIND_PAE_PDPT_PHYS";
5879	case PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT:
5880	return "PGMPOOLKIND_64BIT_PDPT_FOR_64BIT_PDPT";
5881	case PGMPOOLKIND_64BIT_PDPT_FOR_PHYS:
5882	return "PGMPOOLKIND_64BIT_PDPT_FOR_PHYS";
5883	case PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD:
5884	return "PGMPOOLKIND_64BIT_PD_FOR_64BIT_PD";
5885	case PGMPOOLKIND_64BIT_PD_FOR_PHYS:
5886	return "PGMPOOLKIND_64BIT_PD_FOR_PHYS";
5887	case PGMPOOLKIND_64BIT_PML4:
5888	return "PGMPOOLKIND_64BIT_PML4";
5889	case PGMPOOLKIND_EPT_PDPT_FOR_PHYS:
5890	return "PGMPOOLKIND_EPT_PDPT_FOR_PHYS";
5891	case PGMPOOLKIND_EPT_PD_FOR_PHYS:
5892	return "PGMPOOLKIND_EPT_PD_FOR_PHYS";
5893	case PGMPOOLKIND_EPT_PT_FOR_PHYS:
5894	return "PGMPOOLKIND_EPT_PT_FOR_PHYS";
5895	case PGMPOOLKIND_ROOT_NESTED:
5896	return "PGMPOOLKIND_ROOT_NESTED";
5897	case PGMPOOLKIND_EPT_PT_FOR_EPT_PT:
5898	return "PGMPOOLKIND_EPT_PT_FOR_EPT_PT";
5899	case PGMPOOLKIND_EPT_PT_FOR_EPT_2MB:
5900	return "PGMPOOLKIND_EPT_PT_FOR_EPT_2MB";
5901	case PGMPOOLKIND_EPT_PD_FOR_EPT_PD:
5902	return "PGMPOOLKIND_EPT_PD_FOR_EPT_PD";
5903	case PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT:
5904	return "PGMPOOLKIND_EPT_PDPT_FOR_EPT_PDPT";
5905	case PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4:
5906	return "PGMPOOLKIND_EPT_PML4_FOR_EPT_PML4";
5907	}
5908	return "Unknown kind!";
5909	}
5910	#endif /* LOG_ENABLED \|\| VBOX_STRICT */
5911

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp@ 101505

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