PGMAllPhys.cpp@ 17121

Last change on this file since 17121 was 17000, checked in by vboxsync, 16 years ago
Rewrote pgmPoolMonitorGCPtr2CCPtr. Deal with invalid GC shadow pages during fault handling.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 84.0 KB

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1	/* $Id: PGMAllPhys.cpp 17000 2009-02-23 10:01:12Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor, Physical Memory Addressing.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/*******************************************************************************
23	* Defined Constants And Macros *
24	*******************************************************************************/
25	/** @def PGM_IGNORE_RAM_FLAGS_RESERVED
26	* Don't respect the MM_RAM_FLAGS_RESERVED flag when converting to HC addresses.
27	*
28	* Since this flag is currently incorrectly kept set for ROM regions we will
29	* have to ignore it for now so we don't break stuff.
30	*
31	* @todo this has been fixed now I believe, remove this hack.
32	*/
33	#define PGM_IGNORE_RAM_FLAGS_RESERVED
34
35
36	/*******************************************************************************
37	* Header Files *
38	*******************************************************************************/
39	#define LOG_GROUP LOG_GROUP_PGM_PHYS
40	#include <VBox/pgm.h>
41	#include <VBox/trpm.h>
42	#include <VBox/vmm.h>
43	#include <VBox/iom.h>
44	#include <VBox/em.h>
45	#include <VBox/rem.h>
46	#include "PGMInternal.h"
47	#include <VBox/vm.h>
48	#include <VBox/param.h>
49	#include <VBox/err.h>
50	#include <iprt/assert.h>
51	#include <iprt/string.h>
52	#include <iprt/asm.h>
53	#include <VBox/log.h>
54	#ifdef IN_RING3
55	# include <iprt/thread.h>
56	#endif
57
58
59
60	#ifndef IN_RING3
61
62	/**
63	* \#PF Handler callback for Guest ROM range write access.
64	* We simply ignore the writes or fall back to the recompiler if we don't support the instruction.
65	*
66	* @returns VBox status code (appropritate for trap handling and GC return).
67	* @param pVM VM Handle.
68	* @param uErrorCode CPU Error code.
69	* @param pRegFrame Trap register frame.
70	* @param pvFault The fault address (cr2).
71	* @param GCPhysFault The GC physical address corresponding to pvFault.
72	* @param pvUser User argument. Pointer to the ROM range structure.
73	*/
74	VMMDECL(int) pgmPhysRomWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, void pvFault, RTGCPHYS GCPhysFault, void pvUser)
75	{
76	int rc;
77	#ifdef VBOX_WITH_NEW_PHYS_CODE
78	PPGMROMRANGE pRom = (PPGMROMRANGE)pvUser;
79	uint32_t iPage = GCPhysFault - pRom->GCPhys;
80	Assert(iPage < (pRom->cb >> PAGE_SHIFT));
81	switch (pRom->aPages[iPage].enmProt)
82	{
83	case PGMROMPROT_READ_ROM_WRITE_IGNORE:
84	case PGMROMPROT_READ_RAM_WRITE_IGNORE:
85	{
86	#endif
87	/*
88	* If it's a simple instruction which doesn't change the cpu state
89	* we will simply skip it. Otherwise we'll have to defer it to REM.
90	*/
91	uint32_t cbOp;
92	DISCPUSTATE Cpu;
93	rc = EMInterpretDisasOne(pVM, pRegFrame, &Cpu, &cbOp);
94	if ( RT_SUCCESS(rc)
95	&& Cpu.mode == CPUMODE_32BIT /** @todo why does this matter? */
96	&& !(Cpu.prefix & (PREFIX_REPNE \| PREFIX_REP \| PREFIX_SEG)))
97	{
98	switch (Cpu.opcode)
99	{
100	/** @todo Find other instructions we can safely skip, possibly
101	* adding this kind of detection to DIS or EM. */
102	case OP_MOV:
103	pRegFrame->rip += cbOp;
104	STAM_COUNTER_INC(&pVM->pgm.s.StatRZGuestROMWriteHandled);
105	return VINF_SUCCESS;
106	}
107	}
108	else if (RT_UNLIKELY(rc == VERR_INTERNAL_ERROR))
109	return rc;
110	#ifdef VBOX_WITH_NEW_PHYS_CODE
111	break;
112	}
113
114	case PGMROMPROT_READ_RAM_WRITE_RAM:
115	rc = PGMHandlerPhysicalPageTempOff(pVM, pRom->GCPhys, GCPhysFault & X86_PTE_PG_MASK);
116	AssertRC(rc);
117	case PGMROMPROT_READ_ROM_WRITE_RAM:
118	/* Handle it in ring-3 because it's way easier there. */
119	break;
120
121	default:
122	AssertMsgFailedReturn(("enmProt=%d iPage=%d GCPhysFault=%RGp\n",
123	pRom->aPages[iPage].enmProt, iPage, GCPhysFault),
124	VERR_INTERNAL_ERROR);
125	}
126	#endif
127
128	STAM_COUNTER_INC(&pVM->pgm.s.StatRZGuestROMWriteUnhandled);
129	return VINF_EM_RAW_EMULATE_INSTR;
130	}
131
132	#endif /* IN_RING3 */
133
134	/**
135	* Checks if Address Gate 20 is enabled or not.
136	*
137	* @returns true if enabled.
138	* @returns false if disabled.
139	* @param pVM VM handle.
140	*/
141	VMMDECL(bool) PGMPhysIsA20Enabled(PVM pVM)
142	{
143	LogFlow(("PGMPhysIsA20Enabled %d\n", pVM->pgm.s.fA20Enabled));
144	return !!pVM->pgm.s.fA20Enabled ; /* stupid MS compiler doesn't trust me. */
145	}
146
147
148	/**
149	* Validates a GC physical address.
150	*
151	* @returns true if valid.
152	* @returns false if invalid.
153	* @param pVM The VM handle.
154	* @param GCPhys The physical address to validate.
155	*/
156	VMMDECL(bool) PGMPhysIsGCPhysValid(PVM pVM, RTGCPHYS GCPhys)
157	{
158	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
159	return pPage != NULL;
160	}
161
162
163	/**
164	* Checks if a GC physical address is a normal page,
165	* i.e. not ROM, MMIO or reserved.
166	*
167	* @returns true if normal.
168	* @returns false if invalid, ROM, MMIO or reserved page.
169	* @param pVM The VM handle.
170	* @param GCPhys The physical address to check.
171	*/
172	VMMDECL(bool) PGMPhysIsGCPhysNormal(PVM pVM, RTGCPHYS GCPhys)
173	{
174	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
175	return pPage
176	&& !(pPage->HCPhys & (MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO2));
177	}
178
179
180	/**
181	* Converts a GC physical address to a HC physical address.
182	*
183	* @returns VINF_SUCCESS on success.
184	* @returns VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical
185	* page but has no physical backing.
186	* @returns VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid
187	* GC physical address.
188	*
189	* @param pVM The VM handle.
190	* @param GCPhys The GC physical address to convert.
191	* @param pHCPhys Where to store the HC physical address on success.
192	*/
193	VMMDECL(int) PGMPhysGCPhys2HCPhys(PVM pVM, RTGCPHYS GCPhys, PRTHCPHYS pHCPhys)
194	{
195	PPGMPAGE pPage;
196	int rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage);
197	if (RT_FAILURE(rc))
198	return rc;
199
200	#ifndef PGM_IGNORE_RAM_FLAGS_RESERVED
201	if (RT_UNLIKELY(pPage->HCPhys & MM_RAM_FLAGS_RESERVED)) /** @todo PAGE FLAGS */
202	return VERR_PGM_PHYS_PAGE_RESERVED;
203	#endif
204
205	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage) \| (GCPhys & PAGE_OFFSET_MASK);
206	return VINF_SUCCESS;
207	}
208
209
210	/**
211	* Invalidates the GC page mapping TLB.
212	*
213	* @param pVM The VM handle.
214	*/
215	VMMDECL(void) PGMPhysInvalidatePageGCMapTLB(PVM pVM)
216	{
217	/* later */
218	NOREF(pVM);
219	}
220
221
222	/**
223	* Invalidates the ring-0 page mapping TLB.
224	*
225	* @param pVM The VM handle.
226	*/
227	VMMDECL(void) PGMPhysInvalidatePageR0MapTLB(PVM pVM)
228	{
229	PGMPhysInvalidatePageR3MapTLB(pVM);
230	}
231
232
233	/**
234	* Invalidates the ring-3 page mapping TLB.
235	*
236	* @param pVM The VM handle.
237	*/
238	VMMDECL(void) PGMPhysInvalidatePageR3MapTLB(PVM pVM)
239	{
240	pgmLock(pVM);
241	for (unsigned i = 0; i < RT_ELEMENTS(pVM->pgm.s.PhysTlbHC.aEntries); i++)
242	{
243	pVM->pgm.s.PhysTlbHC.aEntries[i].GCPhys = NIL_RTGCPHYS;
244	pVM->pgm.s.PhysTlbHC.aEntries[i].pPage = 0;
245	pVM->pgm.s.PhysTlbHC.aEntries[i].pMap = 0;
246	pVM->pgm.s.PhysTlbHC.aEntries[i].pv = 0;
247	}
248	pgmUnlock(pVM);
249	}
250
251
252	/**
253	* Frees the specified RAM page.
254	*
255	* This is used by ballooning and remapping MMIO2.
256	*
257	* @param pVM Pointer to the shared VM structure.
258	* @param pPage Pointer to the page structure.
259	* @param GCPhys The guest physical address of the page, if applicable.
260	*/
261	void pgmPhysFreePage(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
262	{
263	AssertFatal(PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM);
264
265	/** @todo implement this... */
266	AssertFatalFailed();
267	}
268
269
270	/**
271	* Makes sure that there is at least one handy page ready for use.
272	*
273	* This will also take the appropriate actions when reaching water-marks.
274	*
275	* @returns The following VBox status codes.
276	* @retval VINF_SUCCESS on success.
277	* @retval VERR_EM_NO_MEMORY if we're really out of memory.
278	*
279	* @param pVM The VM handle.
280	*
281	* @remarks Must be called from within the PGM critical section. It may
282	* nip back to ring-3/0 in some cases.
283	*/
284	static int pgmPhysEnsureHandyPage(PVM pVM)
285	{
286	/** @remarks
287	* low-water mark logic for R0 & GC:
288	* - 75%: Set FF.
289	* - 50%: Force return to ring-3 ASAP.
290	*
291	* For ring-3 there is a little problem wrt to the recompiler, so:
292	* - 75%: Set FF.
293	* - 50%: Try allocate pages; on failure we'll force REM to quite ASAP.
294	*
295	* The basic idea is that we should be able to get out of any situation with
296	* only 50% of handy pages remaining.
297	*
298	* At the moment we'll not adjust the number of handy pages relative to the
299	* actual VM RAM committment, that's too much work for now.
300	*/
301	Assert(pVM->pgm.s.cHandyPages <= RT_ELEMENTS(pVM->pgm.s.aHandyPages));
302	if ( !pVM->pgm.s.cHandyPages
303	#ifdef IN_RING3
304	\|\| pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 2 /* 50% */
305	#endif
306	)
307	{
308	Log(("PGM: cHandyPages=%u out of %u -> allocate more\n", pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages)));
309	#ifdef IN_RING3
310	int rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_PGM_ALLOCATE_HANDY_PAGES, 0, NULL);
311	#elif defined(IN_RING0)
312	/** @todo call PGMR0PhysAllocateHandyPages directly - need to make sure we can call kernel code first and deal with the seeding fallback. */
313	int rc = VMMR0CallHost(pVM, VMMCALLHOST_PGM_ALLOCATE_HANDY_PAGES, 0);
314	#else
315	int rc = VMMGCCallHost(pVM, VMMCALLHOST_PGM_ALLOCATE_HANDY_PAGES, 0);
316	#endif
317	if (RT_UNLIKELY(rc != VINF_SUCCESS))
318	{
319	Assert(rc == VINF_EM_NO_MEMORY);
320	if (!pVM->pgm.s.cHandyPages)
321	{
322	LogRel(("PGM: no more handy pages!\n"));
323	return VERR_EM_NO_MEMORY;
324	}
325	Assert(VM_FF_ISSET(pVM, VM_FF_PGM_NEED_HANDY_PAGES));
326	#ifdef IN_RING3
327	REMR3NotifyFF(pVM);
328	#else
329	VM_FF_SET(pVM, VM_FF_TO_R3);
330	#endif
331	}
332	Assert(pVM->pgm.s.cHandyPages <= RT_ELEMENTS(pVM->pgm.s.aHandyPages));
333	}
334	else if (pVM->pgm.s.cHandyPages - 1 <= (RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 4) * 3) /* 75% */
335	{
336	VM_FF_SET(pVM, VM_FF_PGM_NEED_HANDY_PAGES);
337	#ifndef IN_RING3
338	if (pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 2)
339	{
340	Log(("PGM: VM_FF_TO_R3 - cHandyPages=%u out of %u\n", pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages)));
341	VM_FF_SET(pVM, VM_FF_TO_R3);
342	}
343	#endif
344	}
345
346	return VINF_SUCCESS;
347	}
348
349
350	/**
351	* Replace a zero or shared page with new page that we can write to.
352	*
353	* @returns The following VBox status codes.
354	* @retval VINF_SUCCESS on success, pPage is modified.
355	* @retval VERR_EM_NO_MEMORY if we're totally out of memory.
356	*
357	* @todo Propagate VERR_EM_NO_MEMORY up the call tree.
358	*
359	* @param pVM The VM address.
360	* @param pPage The physical page tracking structure. This will
361	* be modified on success.
362	* @param GCPhys The address of the page.
363	*
364	* @remarks Must be called from within the PGM critical section. It may
365	* nip back to ring-3/0 in some cases.
366	*
367	* @remarks This function shouldn't really fail, however if it does
368	* it probably means we've screwed up the size of the amount
369	* and/or the low-water mark of handy pages. Or, that some
370	* device I/O is causing a lot of pages to be allocated while
371	* while the host is in a low-memory condition.
372	*/
373	int pgmPhysAllocPage(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
374	{
375	/*
376	* Ensure that we've got a page handy, take it and use it.
377	*/
378	int rc = pgmPhysEnsureHandyPage(pVM);
379	if (RT_FAILURE(rc))
380	{
381	Assert(rc == VERR_EM_NO_MEMORY);
382	return rc;
383	}
384	AssertMsg(PGM_PAGE_IS_ZERO(pPage) \|\| PGM_PAGE_IS_SHARED(pPage), ("%d %RGp\n", PGM_PAGE_GET_STATE(pPage), GCPhys));
385	Assert(!PGM_PAGE_IS_RESERVED(pPage));
386	Assert(!PGM_PAGE_IS_MMIO(pPage));
387
388	uint32_t iHandyPage = --pVM->pgm.s.cHandyPages;
389	Assert(iHandyPage < RT_ELEMENTS(pVM->pgm.s.aHandyPages));
390	Assert(pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys != NIL_RTHCPHYS);
391	Assert(!(pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
392	Assert(pVM->pgm.s.aHandyPages[iHandyPage].idPage != NIL_GMM_PAGEID);
393	Assert(pVM->pgm.s.aHandyPages[iHandyPage].idSharedPage == NIL_GMM_PAGEID);
394
395	/*
396	* There are one or two action to be taken the next time we allocate handy pages:
397	* - Tell the GMM (global memory manager) what the page is being used for.
398	* (Speeds up replacement operations - sharing and defragmenting.)
399	* - If the current backing is shared, it must be freed.
400	*/
401	const RTHCPHYS HCPhys = pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys;
402	pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys = GCPhys;
403
404	if (PGM_PAGE_IS_SHARED(pPage))
405	{
406	pVM->pgm.s.aHandyPages[iHandyPage].idSharedPage = PGM_PAGE_GET_PAGEID(pPage);
407	Assert(PGM_PAGE_GET_PAGEID(pPage) != NIL_GMM_PAGEID);
408	VM_FF_SET(pVM, VM_FF_PGM_NEED_HANDY_PAGES);
409
410	Log2(("PGM: Replaced shared page %#x at %RGp with %#x / %RHp\n", PGM_PAGE_GET_PAGEID(pPage),
411	GCPhys, pVM->pgm.s.aHandyPages[iHandyPage].idPage, HCPhys));
412	STAM_COUNTER_INC(&pVM->pgm.s.CTX_MID_Z(Stat,PageReplaceShared));
413	pVM->pgm.s.cSharedPages--;
414	/** @todo err.. what about copying the page content? */
415	}
416	else
417	{
418	Log2(("PGM: Replaced zero page %RGp with %#x / %RHp\n", GCPhys, pVM->pgm.s.aHandyPages[iHandyPage].idPage, HCPhys));
419	STAM_COUNTER_INC(&pVM->pgm.s.StatRZPageReplaceZero);
420	pVM->pgm.s.cZeroPages--;
421	/** @todo verify that the handy page is zero! */
422	}
423
424	/*
425	* Do the PGMPAGE modifications.
426	*/
427	pVM->pgm.s.cPrivatePages++;
428	PGM_PAGE_SET_HCPHYS(pPage, HCPhys);
429	PGM_PAGE_SET_PAGEID(pPage, pVM->pgm.s.aHandyPages[iHandyPage].idPage);
430	PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_ALLOCATED);
431
432	return VINF_SUCCESS;
433	}
434
435
436	/**
437	* Deal with pages that are not writable, i.e. not in the ALLOCATED state.
438	*
439	* @returns VBox status code.
440	* @retval VINF_SUCCESS on success.
441	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
442	*
443	* @param pVM The VM address.
444	* @param pPage The physical page tracking structure.
445	* @param GCPhys The address of the page.
446	*
447	* @remarks Called from within the PGM critical section.
448	*/
449	int pgmPhysPageMakeWritable(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
450	{
451	switch (PGM_PAGE_GET_STATE(pPage))
452	{
453	case PGM_PAGE_STATE_WRITE_MONITORED:
454	PGM_PAGE_SET_WRITTEN_TO(pPage);
455	PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_ALLOCATED);
456	/* fall thru */
457	default: /* to shut up GCC */
458	case PGM_PAGE_STATE_ALLOCATED:
459	return VINF_SUCCESS;
460
461	/*
462	* Zero pages can be dummy pages for MMIO or reserved memory,
463	* so we need to check the flags before joining cause with
464	* shared page replacement.
465	*/
466	case PGM_PAGE_STATE_ZERO:
467	if ( PGM_PAGE_IS_MMIO(pPage)
468	\|\| PGM_PAGE_IS_RESERVED(pPage))
469	return VERR_PGM_PHYS_PAGE_RESERVED;
470	/* fall thru */
471	case PGM_PAGE_STATE_SHARED:
472	return pgmPhysAllocPage(pVM, pPage, GCPhys);
473	}
474	}
475
476
477	/**
478	* Maps a page into the current virtual address space so it can be accessed.
479	*
480	* @returns VBox status code.
481	* @retval VINF_SUCCESS on success.
482	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
483	*
484	* @param pVM The VM address.
485	* @param pPage The physical page tracking structure.
486	* @param GCPhys The address of the page.
487	* @param ppMap Where to store the address of the mapping tracking structure.
488	* @param ppv Where to store the mapping address of the page. The page
489	* offset is masked off!
490	*
491	* @remarks Called from within the PGM critical section.
492	*/
493	int pgmPhysPageMap(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys, PPPGMPAGEMAP ppMap, void **ppv)
494	{
495	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
496	/*
497	* Just some sketchy GC/R0-darwin code.
498	*/
499	*ppMap = NULL;
500	RTHCPHYS HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
501	Assert(HCPhys != pVM->pgm.s.HCPhysZeroPg);
502	# ifdef VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0
503	pgmR0DynMapHCPageInlined(&pVM->pgm.s, HCPhys, ppv);
504	# else
505	PGMDynMapHCPage(pVM, HCPhys, ppv);
506	# endif
507	return VINF_SUCCESS;
508
509	#else /* IN_RING3 \|\| IN_RING0 */
510
511	/*
512	* Find/make Chunk TLB entry for the mapping chunk.
513	*/
514	PPGMCHUNKR3MAP pMap;
515	const uint32_t idChunk = PGM_PAGE_GET_CHUNKID(pPage);
516	PPGMCHUNKR3MAPTLBE pTlbe = &pVM->pgm.s.ChunkR3Map.Tlb.aEntries[PGM_CHUNKR3MAPTLB_IDX(idChunk)];
517	if (pTlbe->idChunk == idChunk)
518	{
519	STAM_COUNTER_INC(&pVM->pgm.s.CTX_MID_Z(Stat,ChunkR3MapTlbHits));
520	pMap = pTlbe->pChunk;
521	}
522	else if (idChunk != NIL_GMM_CHUNKID)
523	{
524	STAM_COUNTER_INC(&pVM->pgm.s.CTX_MID_Z(Stat,ChunkR3MapTlbMisses));
525
526	/*
527	* Find the chunk, map it if necessary.
528	*/
529	pMap = (PPGMCHUNKR3MAP)RTAvlU32Get(&pVM->pgm.s.ChunkR3Map.pTree, idChunk);
530	if (!pMap)
531	{
532	#ifdef IN_RING0
533	int rc = VMMR0CallHost(pVM, VMMCALLHOST_PGM_MAP_CHUNK, idChunk);
534	AssertRCReturn(rc, rc);
535	pMap = (PPGMCHUNKR3MAP)RTAvlU32Get(&pVM->pgm.s.ChunkR3Map.pTree, idChunk);
536	Assert(pMap);
537	#else
538	int rc = pgmR3PhysChunkMap(pVM, idChunk, &pMap);
539	if (RT_FAILURE(rc))
540	return rc;
541	#endif
542	}
543
544	/*
545	* Enter it into the Chunk TLB.
546	*/
547	pTlbe->idChunk = idChunk;
548	pTlbe->pChunk = pMap;
549	pMap->iAge = 0;
550	}
551	else
552	{
553	Assert(PGM_PAGE_IS_ZERO(pPage));
554	*ppv = pVM->pgm.s.CTXALLSUFF(pvZeroPg);
555	*ppMap = NULL;
556	return VINF_SUCCESS;
557	}
558
559	ppv = (uint8_t )pMap->pv + (PGM_PAGE_GET_PAGE_IN_CHUNK(pPage) << PAGE_SHIFT);
560	*ppMap = pMap;
561	return VINF_SUCCESS;
562	#endif /* IN_RING3 */
563	}
564
565
566	#if !defined(IN_RC) && !defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
567	/**
568	* Load a guest page into the ring-3 physical TLB.
569	*
570	* @returns VBox status code.
571	* @retval VINF_SUCCESS on success
572	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
573	* @param pPGM The PGM instance pointer.
574	* @param GCPhys The guest physical address in question.
575	*/
576	int pgmPhysPageLoadIntoTlb(PPGM pPGM, RTGCPHYS GCPhys)
577	{
578	STAM_COUNTER_INC(&pPGM->CTX_MID_Z(Stat,PageMapTlbMisses));
579
580	/*
581	* Find the ram range.
582	* 99.8% of requests are expected to be in the first range.
583	*/
584	PPGMRAMRANGE pRam = pPGM->CTX_SUFF(pRamRanges);
585	RTGCPHYS off = GCPhys - pRam->GCPhys;
586	if (RT_UNLIKELY(off >= pRam->cb))
587	{
588	do
589	{
590	pRam = pRam->CTX_SUFF(pNext);
591	if (!pRam)
592	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
593	off = GCPhys - pRam->GCPhys;
594	} while (off >= pRam->cb);
595	}
596
597	/*
598	* Map the page.
599	* Make a special case for the zero page as it is kind of special.
600	*/
601	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
602	PPGMPAGEMAPTLBE pTlbe = &pPGM->CTXSUFF(PhysTlb).aEntries[PGM_PAGEMAPTLB_IDX(GCPhys)];
603	if (!PGM_PAGE_IS_ZERO(pPage))
604	{
605	void *pv;
606	PPGMPAGEMAP pMap;
607	int rc = pgmPhysPageMap(PGM2VM(pPGM), pPage, GCPhys, &pMap, &pv);
608	if (RT_FAILURE(rc))
609	return rc;
610	pTlbe->pMap = pMap;
611	pTlbe->pv = pv;
612	}
613	else
614	{
615	Assert(PGM_PAGE_GET_HCPHYS(pPage) == pPGM->HCPhysZeroPg);
616	pTlbe->pMap = NULL;
617	pTlbe->pv = pPGM->CTXALLSUFF(pvZeroPg);
618	}
619	pTlbe->pPage = pPage;
620	return VINF_SUCCESS;
621	}
622	#endif /* !IN_RC && !VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0 */
623
624
625	/**
626	* Requests the mapping of a guest page into the current context.
627	*
628	* This API should only be used for very short term, as it will consume
629	* scarse resources (R0 and GC) in the mapping cache. When you're done
630	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
631	*
632	* This API will assume your intention is to write to the page, and will
633	* therefore replace shared and zero pages. If you do not intend to modify
634	* the page, use the PGMPhysGCPhys2CCPtrReadOnly() API.
635	*
636	* @returns VBox status code.
637	* @retval VINF_SUCCESS on success.
638	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
639	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
640	*
641	* @param pVM The VM handle.
642	* @param GCPhys The guest physical address of the page that should be mapped.
643	* @param ppv Where to store the address corresponding to GCPhys.
644	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
645	*
646	* @remark Avoid calling this API from within critical sections (other than
647	* the PGM one) because of the deadlock risk.
648	* @thread Any thread.
649	*/
650	VMMDECL(int) PGMPhysGCPhys2CCPtr(PVM pVM, RTGCPHYS GCPhys, void **ppv, PPGMPAGEMAPLOCK pLock)
651	{
652	#ifdef VBOX_WITH_NEW_PHYS_CODE
653	# if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
654	/** @todo this needs to be fixed, it really ain't right. */
655	/* Until a physical TLB is implemented for GC or/and R0-darwin, let PGMDynMapGCPageEx handle it. */
656	return PGMDynMapGCPageOff(pVM, GCPhys, ppv);
657
658	#else
659	int rc = pgmLock(pVM);
660	AssertRCReturn(rc);
661
662	/*
663	* Query the Physical TLB entry for the page (may fail).
664	*/
665	PGMPHYSTLBE pTlbe;
666	int rc = pgmPhysPageQueryTlbe(&pVM->pgm.s, GCPhys, &pTlbe);
667	if (RT_SUCCESS(rc))
668	{
669	/*
670	* If the page is shared, the zero page, or being write monitored
671	* it must be converted to an page that's writable if possible.
672	*/
673	PPGMPAGE pPage = pTlbe->pPage;
674	if (RT_UNLIKELY(PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED))
675	{
676	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhys);
677	/** @todo stuff is missing here! */
678	}
679	if (RT_SUCCESS(rc))
680	{
681	/*
682	* Now, just perform the locking and calculate the return address.
683	*/
684	PPGMPAGEMAP pMap = pTlbe->pMap;
685	pMap->cRefs++;
686	if (RT_LIKELY(pPage->cLocks != PGM_PAGE_MAX_LOCKS))
687	if (RT_UNLIKELY(++pPage->cLocks == PGM_PAGE_MAX_LOCKS))
688	{
689	AssertMsgFailed(("%RGp is entering permanent locked state!\n", GCPhys));
690	pMap->cRefs++; /* Extra ref to prevent it from going away. */
691	}
692
693	ppv = (void )((uintptr_t)pTlbe->pv \| (GCPhys & PAGE_OFFSET_MASK));
694	pLock->pvPage = pPage;
695	pLock->pvMap = pMap;
696	}
697	}
698
699	pgmUnlock(pVM);
700	return rc;
701
702	#endif /* IN_RING3 \|\| IN_RING0 */
703
704	#else
705	/*
706	* Temporary fallback code.
707	*/
708	# if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
709	/** @todo @bugref{3202}: check up this path. */
710	return PGMDynMapGCPageOff(pVM, GCPhys, ppv);
711	# else
712	return PGMPhysGCPhys2R3Ptr(pVM, GCPhys, 1, (PRTR3PTR)ppv);
713	# endif
714	#endif
715	}
716
717
718	/**
719	* Requests the mapping of a guest page into the current context.
720	*
721	* This API should only be used for very short term, as it will consume
722	* scarse resources (R0 and GC) in the mapping cache. When you're done
723	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
724	*
725	* @returns VBox status code.
726	* @retval VINF_SUCCESS on success.
727	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
728	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
729	*
730	* @param pVM The VM handle.
731	* @param GCPhys The guest physical address of the page that should be mapped.
732	* @param ppv Where to store the address corresponding to GCPhys.
733	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
734	*
735	* @remark Avoid calling this API from within critical sections (other than
736	* the PGM one) because of the deadlock risk.
737	* @thread Any thread.
738	*/
739	VMMDECL(int) PGMPhysGCPhys2CCPtrReadOnly(PVM pVM, RTGCPHYS GCPhys, void const **ppv, PPGMPAGEMAPLOCK pLock)
740	{
741	/** @todo implement this */
742	return PGMPhysGCPhys2CCPtr(pVM, GCPhys, (void **)ppv, pLock);
743	}
744
745
746	/**
747	* Requests the mapping of a guest page given by virtual address into the current context.
748	*
749	* This API should only be used for very short term, as it will consume
750	* scarse resources (R0 and GC) in the mapping cache. When you're done
751	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
752	*
753	* This API will assume your intention is to write to the page, and will
754	* therefore replace shared and zero pages. If you do not intend to modify
755	* the page, use the PGMPhysGCPtr2CCPtrReadOnly() API.
756	*
757	* @returns VBox status code.
758	* @retval VINF_SUCCESS on success.
759	* @retval VERR_PAGE_TABLE_NOT_PRESENT if the page directory for the virtual address isn't present.
760	* @retval VERR_PAGE_NOT_PRESENT if the page at the virtual address isn't present.
761	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
762	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
763	*
764	* @param pVM The VM handle.
765	* @param GCPhys The guest physical address of the page that should be mapped.
766	* @param ppv Where to store the address corresponding to GCPhys.
767	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
768	*
769	* @remark Avoid calling this API from within critical sections (other than
770	* the PGM one) because of the deadlock risk.
771	* @thread EMT
772	*/
773	VMMDECL(int) PGMPhysGCPtr2CCPtr(PVM pVM, RTGCPTR GCPtr, void **ppv, PPGMPAGEMAPLOCK pLock)
774	{
775	RTGCPHYS GCPhys;
776	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
777	if (RT_SUCCESS(rc))
778	rc = PGMPhysGCPhys2CCPtr(pVM, GCPhys, ppv, pLock);
779	return rc;
780	}
781
782
783	/**
784	* Requests the mapping of a guest page given by virtual address into the current context.
785	*
786	* This API should only be used for very short term, as it will consume
787	* scarse resources (R0 and GC) in the mapping cache. When you're done
788	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
789	*
790	* @returns VBox status code.
791	* @retval VINF_SUCCESS on success.
792	* @retval VERR_PAGE_TABLE_NOT_PRESENT if the page directory for the virtual address isn't present.
793	* @retval VERR_PAGE_NOT_PRESENT if the page at the virtual address isn't present.
794	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
795	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
796	*
797	* @param pVM The VM handle.
798	* @param GCPhys The guest physical address of the page that should be mapped.
799	* @param ppv Where to store the address corresponding to GCPhys.
800	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
801	*
802	* @remark Avoid calling this API from within critical sections (other than
803	* the PGM one) because of the deadlock risk.
804	* @thread EMT
805	*/
806	VMMDECL(int) PGMPhysGCPtr2CCPtrReadOnly(PVM pVM, RTGCPTR GCPtr, void const **ppv, PPGMPAGEMAPLOCK pLock)
807	{
808	RTGCPHYS GCPhys;
809	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
810	if (RT_SUCCESS(rc))
811	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys, ppv, pLock);
812	return rc;
813	}
814
815
816	/**
817	* Release the mapping of a guest page.
818	*
819	* This is the counter part of PGMPhysGCPhys2CCPtr, PGMPhysGCPhys2CCPtrReadOnly
820	* PGMPhysGCPtr2CCPtr and PGMPhysGCPtr2CCPtrReadOnly.
821	*
822	* @param pVM The VM handle.
823	* @param pLock The lock structure initialized by the mapping function.
824	*/
825	VMMDECL(void) PGMPhysReleasePageMappingLock(PVM pVM, PPGMPAGEMAPLOCK pLock)
826	{
827	#ifdef VBOX_WITH_NEW_PHYS_CODE
828	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
829	/* currently nothing to do here. */
830	/* --- postponed
831	#elif defined(IN_RING0)
832	*/
833
834	#else /* IN_RING3 */
835	pgmLock(pVM);
836
837	PPGMPAGE pPage = (PPGMPAGE)pLock->pvPage;
838	Assert(pPage->cLocks >= 1);
839	if (pPage->cLocks != PGM_PAGE_MAX_LOCKS)
840	pPage->cLocks--;
841
842	PPGMCHUNKR3MAP pChunk = (PPGMCHUNKR3MAP)pLock->pvChunk;
843	Assert(pChunk->cRefs >= 1);
844	pChunk->cRefs--;
845	pChunk->iAge = 0;
846
847	pgmUnlock(pVM);
848	#endif /* IN_RING3 */
849	#else
850	NOREF(pVM);
851	NOREF(pLock);
852	#endif
853	}
854
855
856	/**
857	* Converts a GC physical address to a HC ring-3 pointer.
858	*
859	* @returns VINF_SUCCESS on success.
860	* @returns VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical
861	* page but has no physical backing.
862	* @returns VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid
863	* GC physical address.
864	* @returns VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY if the range crosses
865	* a dynamic ram chunk boundary
866	*
867	* @param pVM The VM handle.
868	* @param GCPhys The GC physical address to convert.
869	* @param cbRange Physical range
870	* @param pR3Ptr Where to store the R3 pointer on success.
871	*/
872	VMMDECL(int) PGMPhysGCPhys2R3Ptr(PVM pVM, RTGCPHYS GCPhys, RTUINT cbRange, PRTR3PTR pR3Ptr)
873	{
874	#ifdef VBOX_WITH_NEW_PHYS_CODE
875	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
876	#endif
877
878	if ((GCPhys & PGM_DYNAMIC_CHUNK_BASE_MASK) != ((GCPhys+cbRange-1) & PGM_DYNAMIC_CHUNK_BASE_MASK))
879	{
880	AssertMsgFailed(("%RGp - %RGp crosses a chunk boundary!!\n", GCPhys, GCPhys+cbRange));
881	LogRel(("PGMPhysGCPhys2HCPtr %RGp - %RGp crosses a chunk boundary!!\n", GCPhys, GCPhys+cbRange));
882	return VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY;
883	}
884
885	PPGMRAMRANGE pRam;
886	PPGMPAGE pPage;
887	int rc = pgmPhysGetPageAndRangeEx(&pVM->pgm.s, GCPhys, &pPage, &pRam);
888	if (RT_FAILURE(rc))
889	return rc;
890
891	#ifndef PGM_IGNORE_RAM_FLAGS_RESERVED
892	if (RT_UNLIKELY(PGM_PAGE_IS_RESERVED(pPage)))
893	return VERR_PGM_PHYS_PAGE_RESERVED;
894	#endif
895
896	RTGCPHYS off = GCPhys - pRam->GCPhys;
897	if (RT_UNLIKELY(off + cbRange > pRam->cb))
898	{
899	AssertMsgFailed(("%RGp - %RGp crosses a chunk boundary!!\n", GCPhys, GCPhys + cbRange));
900	return VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY;
901	}
902
903	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
904	{
905	unsigned iChunk = (off >> PGM_DYNAMIC_CHUNK_SHIFT);
906	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0) /* ASSUMES this is a rare occurence */
907	PRTR3UINTPTR paChunkR3Ptrs = (PRTR3UINTPTR)MMHyperR3ToCC(pVM, pRam->paChunkR3Ptrs);
908	*pR3Ptr = (RTR3PTR)(paChunkR3Ptrs[iChunk] + (off & PGM_DYNAMIC_CHUNK_OFFSET_MASK));
909	#else
910	*pR3Ptr = (RTR3PTR)(pRam->paChunkR3Ptrs[iChunk] + (off & PGM_DYNAMIC_CHUNK_OFFSET_MASK));
911	#endif
912	}
913	else if (RT_LIKELY(pRam->pvR3))
914	*pR3Ptr = (RTR3PTR)((RTR3UINTPTR)pRam->pvR3 + off);
915	else
916	return VERR_PGM_PHYS_PAGE_RESERVED;
917	return VINF_SUCCESS;
918	}
919
920
921	/**
922	* PGMPhysGCPhys2R3Ptr convenience for use with assertions.
923	*
924	* @returns The R3Ptr, NIL_RTR3PTR on failure.
925	* @param pVM The VM handle.
926	* @param GCPhys The GC Physical addresss.
927	* @param cbRange Physical range.
928	*/
929	VMMDECL(RTR3PTR) PGMPhysGCPhys2R3PtrAssert(PVM pVM, RTGCPHYS GCPhys, RTUINT cbRange)
930	{
931	RTR3PTR R3Ptr;
932	int rc = PGMPhysGCPhys2R3Ptr(pVM, GCPhys, cbRange, &R3Ptr);
933	if (RT_SUCCESS(rc))
934	return R3Ptr;
935	return NIL_RTR3PTR;
936	}
937
938
939	/**
940	* Converts a guest pointer to a GC physical address.
941	*
942	* This uses the current CR3/CR0/CR4 of the guest.
943	*
944	* @returns VBox status code.
945	* @param pVM The VM Handle
946	* @param GCPtr The guest pointer to convert.
947	* @param pGCPhys Where to store the GC physical address.
948	*/
949	VMMDECL(int) PGMPhysGCPtr2GCPhys(PVM pVM, RTGCPTR GCPtr, PRTGCPHYS pGCPhys)
950	{
951	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, pGCPhys);
952	if (pGCPhys && RT_SUCCESS(rc))
953	*pGCPhys \|= (RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK;
954	return rc;
955	}
956
957
958	/**
959	* Converts a guest pointer to a HC physical address.
960	*
961	* This uses the current CR3/CR0/CR4 of the guest.
962	*
963	* @returns VBox status code.
964	* @param pVM The VM Handle
965	* @param GCPtr The guest pointer to convert.
966	* @param pHCPhys Where to store the HC physical address.
967	*/
968	VMMDECL(int) PGMPhysGCPtr2HCPhys(PVM pVM, RTGCPTR GCPtr, PRTHCPHYS pHCPhys)
969	{
970	RTGCPHYS GCPhys;
971	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, &GCPhys);
972	if (RT_SUCCESS(rc))
973	rc = PGMPhysGCPhys2HCPhys(pVM, GCPhys \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), pHCPhys);
974	return rc;
975	}
976
977
978	/**
979	* Converts a guest pointer to a R3 pointer.
980	*
981	* This uses the current CR3/CR0/CR4 of the guest.
982	*
983	* @returns VBox status code.
984	* @param pVM The VM Handle
985	* @param GCPtr The guest pointer to convert.
986	* @param pR3Ptr Where to store the R3 virtual address.
987	*/
988	VMMDECL(int) PGMPhysGCPtr2R3Ptr(PVM pVM, RTGCPTR GCPtr, PRTR3PTR pR3Ptr)
989	{
990	#ifdef VBOX_WITH_NEW_PHYS_CODE
991	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
992	#endif
993
994	RTGCPHYS GCPhys;
995	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, &GCPhys);
996	if (RT_SUCCESS(rc))
997	rc = PGMPhysGCPhys2R3Ptr(pVM, GCPhys \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), 1 /* we always stay within one page */, pR3Ptr);
998	return rc;
999	}
1000
1001
1002	/**
1003	* Converts a guest virtual address to a HC ring-3 pointer by specfied CR3 and
1004	* flags.
1005	*
1006	* @returns VBox status code.
1007	* @param pVM The VM Handle
1008	* @param GCPtr The guest pointer to convert.
1009	* @param cr3 The guest CR3.
1010	* @param fFlags Flags used for interpreting the PD correctly: X86_CR4_PSE and X86_CR4_PAE
1011	* @param pR3Ptr Where to store the R3 pointer.
1012	*
1013	* @remark This function is used by the REM at a time where PGM could
1014	* potentially not be in sync. It could also be used by a
1015	* future DBGF API to cpu state independent conversions.
1016	*/
1017	VMMDECL(int) PGMPhysGCPtr2R3PtrByGstCR3(PVM pVM, RTGCPTR GCPtr, uint64_t cr3, unsigned fFlags, PRTR3PTR pR3Ptr)
1018	{
1019	#ifdef VBOX_WITH_NEW_PHYS_CODE
1020	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
1021	#endif
1022	/*
1023	* PAE or 32-bit?
1024	*/
1025	Assert(!CPUMIsGuestInLongMode(pVM));
1026
1027	int rc;
1028	if (!(fFlags & X86_CR4_PAE))
1029	{
1030	PX86PD pPD;
1031	rc = PGM_GCPHYS_2_PTR(pVM, cr3 & X86_CR3_PAGE_MASK, &pPD);
1032	if (RT_SUCCESS(rc))
1033	{
1034	X86PDE Pde = pPD->a[(RTGCUINTPTR)GCPtr >> X86_PD_SHIFT];
1035	if (Pde.n.u1Present)
1036	{
1037	if ((fFlags & X86_CR4_PSE) && Pde.b.u1Size)
1038	{ /* (big page) */
1039	rc = PGMPhysGCPhys2R3Ptr(pVM, pgmGstGet4MBPhysPage(&pVM->pgm.s, Pde) \| ((RTGCUINTPTR)GCPtr & X86_PAGE_4M_OFFSET_MASK),
1040	1 /* we always stay within one page */, pR3Ptr);
1041	}
1042	else
1043	{ /* (normal page) */
1044	PX86PT pPT;
1045	rc = PGM_GCPHYS_2_PTR(pVM, Pde.u & X86_PDE_PG_MASK, &pPT);
1046	if (RT_SUCCESS(rc))
1047	{
1048	X86PTE Pte = pPT->a[((RTGCUINTPTR)GCPtr >> X86_PT_SHIFT) & X86_PT_MASK];
1049	if (Pte.n.u1Present)
1050	return PGMPhysGCPhys2R3Ptr(pVM, (Pte.u & X86_PTE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK),
1051	1 /* we always stay within one page */, pR3Ptr);
1052	rc = VERR_PAGE_NOT_PRESENT;
1053	}
1054	}
1055	}
1056	else
1057	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1058	}
1059	}
1060	else
1061	{
1062	/** @todo long mode! */
1063	Assert(PGMGetGuestMode(pVM) < PGMMODE_AMD64);
1064
1065	PX86PDPT pPdpt;
1066	rc = PGM_GCPHYS_2_PTR(pVM, cr3 & X86_CR3_PAE_PAGE_MASK, &pPdpt);
1067	if (RT_SUCCESS(rc))
1068	{
1069	X86PDPE Pdpe = pPdpt->a[((RTGCUINTPTR)GCPtr >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE];
1070	if (Pdpe.n.u1Present)
1071	{
1072	PX86PDPAE pPD;
1073	rc = PGM_GCPHYS_2_PTR(pVM, Pdpe.u & X86_PDPE_PG_MASK, &pPD);
1074	if (RT_SUCCESS(rc))
1075	{
1076	X86PDEPAE Pde = pPD->a[((RTGCUINTPTR)GCPtr >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK];
1077	if (Pde.n.u1Present)
1078	{
1079	if ((fFlags & X86_CR4_PSE) && Pde.b.u1Size)
1080	{ /* (big page) */
1081	rc = PGMPhysGCPhys2R3Ptr(pVM, (Pde.u & X86_PDE2M_PAE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & X86_PAGE_2M_OFFSET_MASK),
1082	1 /* we always stay within one page */, pR3Ptr);
1083	}
1084	else
1085	{ /* (normal page) */
1086	PX86PTPAE pPT;
1087	rc = PGM_GCPHYS_2_PTR(pVM, (Pde.u & X86_PDE_PAE_PG_MASK), &pPT);
1088	if (RT_SUCCESS(rc))
1089	{
1090	X86PTEPAE Pte = pPT->a[((RTGCUINTPTR)GCPtr >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK];
1091	if (Pte.n.u1Present)
1092	return PGMPhysGCPhys2R3Ptr(pVM, (Pte.u & X86_PTE_PAE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK),
1093	1 /* we always stay within one page */, pR3Ptr);
1094	rc = VERR_PAGE_NOT_PRESENT;
1095	}
1096	}
1097	}
1098	else
1099	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1100	}
1101	}
1102	else
1103	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1104	}
1105	}
1106	return rc;
1107	}
1108
1109
1110	#undef LOG_GROUP
1111	#define LOG_GROUP LOG_GROUP_PGM_PHYS_ACCESS
1112
1113
1114	#ifdef IN_RING3
1115	/**
1116	* Cache PGMPhys memory access
1117	*
1118	* @param pVM VM Handle.
1119	* @param pCache Cache structure pointer
1120	* @param GCPhys GC physical address
1121	* @param pbHC HC pointer corresponding to physical page
1122	*
1123	* @thread EMT.
1124	*/
1125	static void pgmPhysCacheAdd(PVM pVM, PGMPHYSCACHE pCache, RTGCPHYS GCPhys, uint8_t pbR3)
1126	{
1127	uint32_t iCacheIndex;
1128
1129	Assert(VM_IS_EMT(pVM));
1130
1131	GCPhys = PHYS_PAGE_ADDRESS(GCPhys);
1132	pbR3 = (uint8_t *)PAGE_ADDRESS(pbR3);
1133
1134	iCacheIndex = ((GCPhys >> PAGE_SHIFT) & PGM_MAX_PHYSCACHE_ENTRIES_MASK);
1135
1136	ASMBitSet(&pCache->aEntries, iCacheIndex);
1137
1138	pCache->Entry[iCacheIndex].GCPhys = GCPhys;
1139	pCache->Entry[iCacheIndex].pbR3 = pbR3;
1140	}
1141	#endif /* IN_RING3 */
1142
1143	/**
1144	* Read physical memory.
1145	*
1146	* This API respects access handlers and MMIO. Use PGMPhysSimpleReadGCPhys() if you
1147	* want to ignore those.
1148	*
1149	* @param pVM VM Handle.
1150	* @param GCPhys Physical address start reading from.
1151	* @param pvBuf Where to put the read bits.
1152	* @param cbRead How many bytes to read.
1153	*/
1154	VMMDECL(void) PGMPhysRead(PVM pVM, RTGCPHYS GCPhys, void *pvBuf, size_t cbRead)
1155	{
1156	#ifdef IN_RING3
1157	bool fGrabbedLock = false;
1158	#endif
1159
1160	AssertMsg(cbRead > 0, ("don't even think about reading zero bytes!\n"));
1161	if (cbRead == 0)
1162	return;
1163
1164	LogFlow(("PGMPhysRead: %RGp %d\n", GCPhys, cbRead));
1165
1166	#ifdef IN_RING3
1167	if (!VM_IS_EMT(pVM))
1168	{
1169	pgmLock(pVM);
1170	fGrabbedLock = true;
1171	}
1172	#endif
1173
1174	/*
1175	* Copy loop on ram ranges.
1176	*/
1177	PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
1178	for (;;)
1179	{
1180	/* Find range. */
1181	while (pRam && GCPhys > pRam->GCPhysLast)
1182	pRam = pRam->CTX_SUFF(pNext);
1183	/* Inside range or not? */
1184	if (pRam && GCPhys >= pRam->GCPhys)
1185	{
1186	/*
1187	* Must work our way thru this page by page.
1188	*/
1189	RTGCPHYS off = GCPhys - pRam->GCPhys;
1190	while (off < pRam->cb)
1191	{
1192	unsigned iPage = off >> PAGE_SHIFT;
1193	PPGMPAGE pPage = &pRam->aPages[iPage];
1194	size_t cb;
1195
1196	/* Physical chunk in dynamically allocated range not present? */
1197	if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage)))
1198	{
1199	/* Treat it as reserved; return zeros */
1200	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1201	if (cb >= cbRead)
1202	{
1203	memset(pvBuf, 0, cbRead);
1204	goto end;
1205	}
1206	memset(pvBuf, 0, cb);
1207	}
1208	/* temp hacks, will be reorganized. */
1209	/*
1210	* Physical handler.
1211	*/
1212	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_PHYS_STATE(pPage) >= PGM_PAGE_HNDL_PHYS_STATE_ALL)
1213	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1214	{
1215	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1216	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1217
1218	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1219	/* find and call the handler */
1220	PPGMPHYSHANDLER pNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesR3->PhysHandlers, GCPhys);
1221	if (pNode && pNode->pfnHandlerR3)
1222	{
1223	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1224	if (cbRange < cb)
1225	cb = cbRange;
1226	if (cb > cbRead)
1227	cb = cbRead;
1228
1229	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1230
1231	/* Note! Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1232	rc = pNode->pfnHandlerR3(pVM, GCPhys, pvSrc, pvBuf, cb, PGMACCESSTYPE_READ, pNode->pvUserR3);
1233	}
1234	#endif /* IN_RING3 */
1235	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1236	{
1237	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1238	void *pvSrc = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1239	#else
1240	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1241	#endif
1242
1243	if (cb >= cbRead)
1244	{
1245	memcpy(pvBuf, pvSrc, cbRead);
1246	goto end;
1247	}
1248	memcpy(pvBuf, pvSrc, cb);
1249	}
1250	else if (cb >= cbRead)
1251	goto end;
1252	}
1253	/*
1254	* Virtual handlers.
1255	*/
1256	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_VIRT_STATE(pPage) >= PGM_PAGE_HNDL_VIRT_STATE_ALL)
1257	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1258	{
1259	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1260	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1261	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1262	/* Search the whole tree for matching physical addresses (rather expensive!) */
1263	PPGMVIRTHANDLER pNode;
1264	unsigned iPage;
1265	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pNode, &iPage);
1266	if (RT_SUCCESS(rc2) && pNode->pfnHandlerR3)
1267	{
1268	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1269	if (cbRange < cb)
1270	cb = cbRange;
1271	if (cb > cbRead)
1272	cb = cbRead;
1273	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pNode->Core.Key & PAGE_BASE_GC_MASK)
1274	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1275
1276	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1277
1278	/* Note! Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1279	rc = pNode->pfnHandlerR3(pVM, (RTGCPTR)GCPtr, pvSrc, pvBuf, cb, PGMACCESSTYPE_READ, 0);
1280	}
1281	#endif /* IN_RING3 */
1282	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1283	{
1284	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1285	void *pvSrc = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1286	#else
1287	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1288	#endif
1289	if (cb >= cbRead)
1290	{
1291	memcpy(pvBuf, pvSrc, cbRead);
1292	goto end;
1293	}
1294	memcpy(pvBuf, pvSrc, cb);
1295	}
1296	else if (cb >= cbRead)
1297	goto end;
1298	}
1299	else
1300	{
1301	switch (pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM)) /** @todo PAGE FLAGS */
1302	{
1303	/*
1304	* Normal memory or ROM.
1305	*/
1306	case 0:
1307	case MM_RAM_FLAGS_ROM:
1308	case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_RESERVED:
1309	//case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO2: /* = shadow */ - //MMIO2 isn't in the mask.
1310	case MM_RAM_FLAGS_MMIO2: // MMIO2 isn't in the mask.
1311	{
1312	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1313	void *pvSrc = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1314	#else
1315	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1316	#endif
1317	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1318	if (cb >= cbRead)
1319	{
1320	#if defined(IN_RING3) && defined(PGM_PHYSMEMACCESS_CACHING)
1321	if (cbRead <= 4 && !fGrabbedLock /* i.e. EMT */)
1322	pgmPhysCacheAdd(pVM, &pVM->pgm.s.pgmphysreadcache, GCPhys, (uint8_t*)pvSrc);
1323	#endif /* IN_RING3 && PGM_PHYSMEMACCESS_CACHING */
1324	memcpy(pvBuf, pvSrc, cbRead);
1325	goto end;
1326	}
1327	memcpy(pvBuf, pvSrc, cb);
1328	break;
1329	}
1330
1331	/*
1332	* All reserved, nothing there.
1333	*/
1334	case MM_RAM_FLAGS_RESERVED:
1335	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1336	if (cb >= cbRead)
1337	{
1338	memset(pvBuf, 0, cbRead);
1339	goto end;
1340	}
1341	memset(pvBuf, 0, cb);
1342	break;
1343
1344	/*
1345	* The rest needs to be taken more carefully.
1346	*/
1347	default:
1348	#if 1 /** @todo r=bird: Can you do this properly please. */
1349	/** @todo Try MMIO; quick hack */
1350	if (cbRead <= 8 && IOMMMIORead(pVM, GCPhys, (uint32_t *)pvBuf, cbRead) == VINF_SUCCESS)
1351	goto end;
1352	#endif
1353
1354	/** @todo fix me later. */
1355	AssertReleaseMsgFailed(("Unknown read at %RGp size %u implement the complex physical reading case %RHp\n",
1356	GCPhys, cbRead,
1357	pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM))); /** @todo PAGE FLAGS */
1358	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1359	break;
1360	}
1361	}
1362	cbRead -= cb;
1363	off += cb;
1364	pvBuf = (char *)pvBuf + cb;
1365	}
1366
1367	GCPhys = pRam->GCPhysLast + 1;
1368	}
1369	else
1370	{
1371	LogFlow(("PGMPhysRead: Unassigned %RGp size=%u\n", GCPhys, cbRead));
1372
1373	/*
1374	* Unassigned address space.
1375	*/
1376	size_t cb;
1377	if ( !pRam
1378	\|\| (cb = pRam->GCPhys - GCPhys) >= cbRead)
1379	{
1380	memset(pvBuf, 0, cbRead);
1381	goto end;
1382	}
1383
1384	memset(pvBuf, 0, cb);
1385	cbRead -= cb;
1386	pvBuf = (char *)pvBuf + cb;
1387	GCPhys += cb;
1388	}
1389	}
1390	end:
1391	#ifdef IN_RING3
1392	if (fGrabbedLock)
1393	pgmUnlock(pVM);
1394	#endif
1395	return;
1396	}
1397
1398
1399	/**
1400	* Write to physical memory.
1401	*
1402	* This API respects access handlers and MMIO. Use PGMPhysSimpleReadGCPhys() if you
1403	* want to ignore those.
1404	*
1405	* @param pVM VM Handle.
1406	* @param GCPhys Physical address to write to.
1407	* @param pvBuf What to write.
1408	* @param cbWrite How many bytes to write.
1409	*/
1410	VMMDECL(void) PGMPhysWrite(PVM pVM, RTGCPHYS GCPhys, const void *pvBuf, size_t cbWrite)
1411	{
1412	#ifdef IN_RING3
1413	bool fGrabbedLock = false;
1414	#endif
1415
1416	AssertMsg(!pVM->pgm.s.fNoMorePhysWrites, ("Calling PGMPhysWrite after pgmR3Save()!\n"));
1417	AssertMsg(cbWrite > 0, ("don't even think about writing zero bytes!\n"));
1418	if (cbWrite == 0)
1419	return;
1420
1421	LogFlow(("PGMPhysWrite: %RGp %d\n", GCPhys, cbWrite));
1422
1423	#ifdef IN_RING3
1424	if (!VM_IS_EMT(pVM))
1425	{
1426	pgmLock(pVM);
1427	fGrabbedLock = true;
1428	}
1429	#endif
1430	/*
1431	* Copy loop on ram ranges.
1432	*/
1433	PPGMRAMRANGE pRam = pVM->pgm.s.CTX_SUFF(pRamRanges);
1434	for (;;)
1435	{
1436	/* Find range. */
1437	while (pRam && GCPhys > pRam->GCPhysLast)
1438	pRam = pRam->CTX_SUFF(pNext);
1439	/* Inside range or not? */
1440	if (pRam && GCPhys >= pRam->GCPhys)
1441	{
1442	/*
1443	* Must work our way thru this page by page.
1444	*/
1445	RTGCPTR off = GCPhys - pRam->GCPhys;
1446	while (off < pRam->cb)
1447	{
1448	RTGCPTR iPage = off >> PAGE_SHIFT;
1449	PPGMPAGE pPage = &pRam->aPages[iPage];
1450
1451	/* Physical chunk in dynamically allocated range not present? */
1452	if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage)))
1453	{
1454	int rc;
1455	#ifdef IN_RING3
1456	if (fGrabbedLock)
1457	{
1458	pgmUnlock(pVM);
1459	rc = pgmr3PhysGrowRange(pVM, GCPhys);
1460	if (rc == VINF_SUCCESS)
1461	PGMPhysWrite(pVM, GCPhys, pvBuf, cbWrite); /* try again; can't assume pRam is still valid (paranoia) */
1462	return;
1463	}
1464	rc = pgmr3PhysGrowRange(pVM, GCPhys);
1465	#else
1466	rc = CTXALLMID(VMM, CallHost)(pVM, VMMCALLHOST_PGM_RAM_GROW_RANGE, GCPhys);
1467	#endif
1468	if (rc != VINF_SUCCESS)
1469	goto end;
1470	}
1471
1472	size_t cb;
1473	/* temporary hack, will reogranize is later. */
1474	/*
1475	* Virtual handlers
1476	*/
1477	if ( PGM_PAGE_HAS_ACTIVE_VIRTUAL_HANDLERS(pPage)
1478	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1479	{
1480	if (PGM_PAGE_HAS_ACTIVE_PHYSICAL_HANDLERS(pPage))
1481	{
1482	/*
1483	* Physical write handler + virtual write handler.
1484	* Consider this a quick workaround for the CSAM + shadow caching problem.
1485	*
1486	* We hand it to the shadow caching first since it requires the unchanged
1487	* data. CSAM will have to put up with it already being changed.
1488	*/
1489	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1490	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1491	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1492	/* 1. The physical handler */
1493	PPGMPHYSHANDLER pPhysNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesR3->PhysHandlers, GCPhys);
1494	if (pPhysNode && pPhysNode->pfnHandlerR3)
1495	{
1496	size_t cbRange = pPhysNode->Core.KeyLast - GCPhys + 1;
1497	if (cbRange < cb)
1498	cb = cbRange;
1499	if (cb > cbWrite)
1500	cb = cbWrite;
1501
1502	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1503
1504	/* Note! Dangerous assumption that R3 handlers don't do anything that really requires an EMT lock! */
1505	rc = pPhysNode->pfnHandlerR3(pVM, GCPhys, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, pPhysNode->pvUserR3);
1506	}
1507
1508	/* 2. The virtual handler (will see incorrect data) */
1509	PPGMVIRTHANDLER pVirtNode;
1510	unsigned iPage;
1511	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pVirtNode, &iPage);
1512	if (RT_SUCCESS(rc2) && pVirtNode->pfnHandlerR3)
1513	{
1514	size_t cbRange = pVirtNode->Core.KeyLast - GCPhys + 1;
1515	if (cbRange < cb)
1516	cb = cbRange;
1517	if (cb > cbWrite)
1518	cb = cbWrite;
1519	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pVirtNode->Core.Key & PAGE_BASE_GC_MASK)
1520	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1521
1522	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1523
1524	/* Note! Dangerous assumption that R3 handlers don't do anything that really requires an EMT lock! */
1525	rc2 = pVirtNode->pfnHandlerR3(pVM, (RTGCPTR)GCPtr, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, 0);
1526	if ( ( rc2 != VINF_PGM_HANDLER_DO_DEFAULT
1527	&& rc == VINF_PGM_HANDLER_DO_DEFAULT)
1528	\|\| ( RT_FAILURE(rc2)
1529	&& RT_SUCCESS(rc)))
1530	rc = rc2;
1531	}
1532	#endif /* IN_RING3 */
1533	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1534	{
1535	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1536	void *pvDst = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1537	#else
1538	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1539	#endif
1540	if (cb >= cbWrite)
1541	{
1542	memcpy(pvDst, pvBuf, cbWrite);
1543	goto end;
1544	}
1545	memcpy(pvDst, pvBuf, cb);
1546	}
1547	else if (cb >= cbWrite)
1548	goto end;
1549	}
1550	else
1551	{
1552	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1553	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1554	#ifdef IN_RING3
1555	/** @todo deal with this in GC and R0! */
1556	/* Search the whole tree for matching physical addresses (rather expensive!) */
1557	PPGMVIRTHANDLER pNode;
1558	unsigned iPage;
1559	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pNode, &iPage);
1560	if (RT_SUCCESS(rc2) && pNode->pfnHandlerR3)
1561	{
1562	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1563	if (cbRange < cb)
1564	cb = cbRange;
1565	if (cb > cbWrite)
1566	cb = cbWrite;
1567	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pNode->Core.Key & PAGE_BASE_GC_MASK)
1568	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1569
1570	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1571
1572	/* Note! Dangerous assumption that R3 handlers don't do anything that really requires an EMT lock! */
1573	rc = pNode->pfnHandlerR3(pVM, (RTGCPTR)GCPtr, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, 0);
1574	}
1575	#endif /* IN_RING3 */
1576	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1577	{
1578	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1579	void *pvDst = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1580	#else
1581	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1582	#endif
1583	if (cb >= cbWrite)
1584	{
1585	memcpy(pvDst, pvBuf, cbWrite);
1586	goto end;
1587	}
1588	memcpy(pvDst, pvBuf, cb);
1589	}
1590	else if (cb >= cbWrite)
1591	goto end;
1592	}
1593	}
1594	/*
1595	* Physical handler.
1596	*/
1597	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_PHYS_STATE(pPage) >= PGM_PAGE_HNDL_PHYS_STATE_WRITE)
1598	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1599	{
1600	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1601	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1602	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1603	/* find and call the handler */
1604	PPGMPHYSHANDLER pNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesR3->PhysHandlers, GCPhys);
1605	if (pNode && pNode->pfnHandlerR3)
1606	{
1607	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1608	if (cbRange < cb)
1609	cb = cbRange;
1610	if (cb > cbWrite)
1611	cb = cbWrite;
1612
1613	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1614
1615	/** @todo Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1616	rc = pNode->pfnHandlerR3(pVM, GCPhys, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, pNode->pvUserR3);
1617	}
1618	#endif /* IN_RING3 */
1619	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1620	{
1621	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1622	void *pvDst = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1623	#else
1624	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1625	#endif
1626	if (cb >= cbWrite)
1627	{
1628	memcpy(pvDst, pvBuf, cbWrite);
1629	goto end;
1630	}
1631	memcpy(pvDst, pvBuf, cb);
1632	}
1633	else if (cb >= cbWrite)
1634	goto end;
1635	}
1636	else
1637	{
1638	/** @todo r=bird: missing MM_RAM_FLAGS_ROM here, we shall not allow anyone to overwrite the ROM! */
1639	switch (pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2)) /** @todo PAGE FLAGS */
1640	{
1641	/*
1642	* Normal memory, MMIO2 or writable shadow ROM.
1643	*/
1644	case 0:
1645	case MM_RAM_FLAGS_MMIO2:
1646	case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO2: /* shadow rom */
1647	{
1648	#if defined(IN_RC) \|\| defined(VBOX_WITH_2X_4GB_ADDR_SPACE_IN_R0)
1649	void *pvDst = pgmDynMapHCPageOff(&pVM->pgm.s, PGM_PAGE_GET_HCPHYS(pPage) + (off & PAGE_OFFSET_MASK));
1650	#else
1651	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1652	#endif
1653	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1654	if (cb >= cbWrite)
1655	{
1656	#if defined(IN_RING3) && defined(PGM_PHYSMEMACCESS_CACHING)
1657	if (cbWrite <= 4 && !fGrabbedLock /* i.e. EMT */)
1658	pgmPhysCacheAdd(pVM, &pVM->pgm.s.pgmphyswritecache, GCPhys, (uint8_t*)pvDst);
1659	#endif /* IN_RING3 && PGM_PHYSMEMACCESS_CACHING */
1660	memcpy(pvDst, pvBuf, cbWrite);
1661	goto end;
1662	}
1663	memcpy(pvDst, pvBuf, cb);
1664	break;
1665	}
1666
1667	/*
1668	* All reserved, nothing there.
1669	*/
1670	case MM_RAM_FLAGS_RESERVED:
1671	case MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO2:
1672	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1673	if (cb >= cbWrite)
1674	goto end;
1675	break;
1676
1677
1678	/*
1679	* The rest needs to be taken more carefully.
1680	*/
1681	default:
1682	#if 1 /** @todo r=bird: Can you do this properly please. */
1683	/** @todo Try MMIO; quick hack */
1684	if (cbWrite <= 8 && IOMMMIOWrite(pVM, GCPhys, (uint32_t )pvBuf, cbWrite) == VINF_SUCCESS)
1685	goto end;
1686	#endif
1687
1688	/** @todo fix me later. */
1689	AssertReleaseMsgFailed(("Unknown write at %RGp size %u implement the complex physical writing case %RHp\n",
1690	GCPhys, cbWrite,
1691	(pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2)))); /** @todo PAGE FLAGS */
1692	/* skip the write */
1693	cb = cbWrite;
1694	break;
1695	}
1696	}
1697
1698	cbWrite -= cb;
1699	off += cb;
1700	pvBuf = (const char *)pvBuf + cb;
1701	}
1702
1703	GCPhys = pRam->GCPhysLast + 1;
1704	}
1705	else
1706	{
1707	/*
1708	* Unassigned address space.
1709	*/
1710	size_t cb;
1711	if ( !pRam
1712	\|\| (cb = pRam->GCPhys - GCPhys) >= cbWrite)
1713	goto end;
1714
1715	cbWrite -= cb;
1716	pvBuf = (const char *)pvBuf + cb;
1717	GCPhys += cb;
1718	}
1719	}
1720	end:
1721	#ifdef IN_RING3
1722	if (fGrabbedLock)
1723	pgmUnlock(pVM);
1724	#endif
1725	return;
1726	}
1727
1728	/**
1729	* Read from guest physical memory by GC physical address, bypassing
1730	* MMIO and access handlers.
1731	*
1732	* @returns VBox status.
1733	* @param pVM VM handle.
1734	* @param pvDst The destination address.
1735	* @param GCPhysSrc The source address (GC physical address).
1736	* @param cb The number of bytes to read.
1737	*/
1738	VMMDECL(int) PGMPhysSimpleReadGCPhys(PVM pVM, void *pvDst, RTGCPHYS GCPhysSrc, size_t cb)
1739	{
1740	/*
1741	* Treat the first page as a special case.
1742	*/
1743	if (!cb)
1744	return VINF_SUCCESS;
1745
1746	/* map the 1st page */
1747	void const *pvSrc;
1748	PGMPAGEMAPLOCK Lock;
1749	int rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhysSrc, &pvSrc, &Lock);
1750	if (RT_FAILURE(rc))
1751	return rc;
1752
1753	/* optimize for the case where access is completely within the first page. */
1754	size_t cbPage = PAGE_SIZE - (GCPhysSrc & PAGE_OFFSET_MASK);
1755	if (RT_LIKELY(cb <= cbPage))
1756	{
1757	memcpy(pvDst, pvSrc, cb);
1758	PGMPhysReleasePageMappingLock(pVM, &Lock);
1759	return VINF_SUCCESS;
1760	}
1761
1762	/* copy to the end of the page. */
1763	memcpy(pvDst, pvSrc, cbPage);
1764	PGMPhysReleasePageMappingLock(pVM, &Lock);
1765	GCPhysSrc += cbPage;
1766	pvDst = (uint8_t *)pvDst + cbPage;
1767	cb -= cbPage;
1768
1769	/*
1770	* Page by page.
1771	*/
1772	for (;;)
1773	{
1774	/* map the page */
1775	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhysSrc, &pvSrc, &Lock);
1776	if (RT_FAILURE(rc))
1777	return rc;
1778
1779	/* last page? */
1780	if (cb <= PAGE_SIZE)
1781	{
1782	memcpy(pvDst, pvSrc, cb);
1783	PGMPhysReleasePageMappingLock(pVM, &Lock);
1784	return VINF_SUCCESS;
1785	}
1786
1787	/* copy the entire page and advance */
1788	memcpy(pvDst, pvSrc, PAGE_SIZE);
1789	PGMPhysReleasePageMappingLock(pVM, &Lock);
1790	GCPhysSrc += PAGE_SIZE;
1791	pvDst = (uint8_t *)pvDst + PAGE_SIZE;
1792	cb -= PAGE_SIZE;
1793	}
1794	/* won't ever get here. */
1795	}
1796
1797	#ifndef IN_RC /* Ring 0 & 3 only. (Just not needed in GC.) */
1798
1799	/**
1800	* Write to guest physical memory referenced by GC pointer.
1801	* Write memory to GC physical address in guest physical memory.
1802	*
1803	* This will bypass MMIO and access handlers.
1804	*
1805	* @returns VBox status.
1806	* @param pVM VM handle.
1807	* @param GCPhysDst The GC physical address of the destination.
1808	* @param pvSrc The source buffer.
1809	* @param cb The number of bytes to write.
1810	*/
1811	VMMDECL(int) PGMPhysSimpleWriteGCPhys(PVM pVM, RTGCPHYS GCPhysDst, const void *pvSrc, size_t cb)
1812	{
1813	LogFlow(("PGMPhysSimpleWriteGCPhys: %RGp %zu\n", GCPhysDst, cb));
1814
1815	/*
1816	* Treat the first page as a special case.
1817	*/
1818	if (!cb)
1819	return VINF_SUCCESS;
1820
1821	/* map the 1st page */
1822	void *pvDst;
1823	PGMPAGEMAPLOCK Lock;
1824	int rc = PGMPhysGCPhys2CCPtr(pVM, GCPhysDst, &pvDst, &Lock);
1825	if (RT_FAILURE(rc))
1826	return rc;
1827
1828	/* optimize for the case where access is completely within the first page. */
1829	size_t cbPage = PAGE_SIZE - (GCPhysDst & PAGE_OFFSET_MASK);
1830	if (RT_LIKELY(cb <= cbPage))
1831	{
1832	memcpy(pvDst, pvSrc, cb);
1833	PGMPhysReleasePageMappingLock(pVM, &Lock);
1834	return VINF_SUCCESS;
1835	}
1836
1837	/* copy to the end of the page. */
1838	memcpy(pvDst, pvSrc, cbPage);
1839	PGMPhysReleasePageMappingLock(pVM, &Lock);
1840	GCPhysDst += cbPage;
1841	pvSrc = (const uint8_t *)pvSrc + cbPage;
1842	cb -= cbPage;
1843
1844	/*
1845	* Page by page.
1846	*/
1847	for (;;)
1848	{
1849	/* map the page */
1850	rc = PGMPhysGCPhys2CCPtr(pVM, GCPhysDst, &pvDst, &Lock);
1851	if (RT_FAILURE(rc))
1852	return rc;
1853
1854	/* last page? */
1855	if (cb <= PAGE_SIZE)
1856	{
1857	memcpy(pvDst, pvSrc, cb);
1858	PGMPhysReleasePageMappingLock(pVM, &Lock);
1859	return VINF_SUCCESS;
1860	}
1861
1862	/* copy the entire page and advance */
1863	memcpy(pvDst, pvSrc, PAGE_SIZE);
1864	PGMPhysReleasePageMappingLock(pVM, &Lock);
1865	GCPhysDst += PAGE_SIZE;
1866	pvSrc = (const uint8_t *)pvSrc + PAGE_SIZE;
1867	cb -= PAGE_SIZE;
1868	}
1869	/* won't ever get here. */
1870	}
1871
1872
1873	/**
1874	* Read from guest physical memory referenced by GC pointer.
1875	*
1876	* This function uses the current CR3/CR0/CR4 of the guest and will
1877	* bypass access handlers and not set any accessed bits.
1878	*
1879	* @returns VBox status.
1880	* @param pVM VM handle.
1881	* @param pvDst The destination address.
1882	* @param GCPtrSrc The source address (GC pointer).
1883	* @param cb The number of bytes to read.
1884	*/
1885	VMMDECL(int) PGMPhysSimpleReadGCPtr(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
1886	{
1887	/*
1888	* Treat the first page as a special case.
1889	*/
1890	if (!cb)
1891	return VINF_SUCCESS;
1892
1893	/* map the 1st page */
1894	void const *pvSrc;
1895	PGMPAGEMAPLOCK Lock;
1896	int rc = PGMPhysGCPtr2CCPtrReadOnly(pVM, GCPtrSrc, &pvSrc, &Lock);
1897	if (RT_FAILURE(rc))
1898	return rc;
1899
1900	/* optimize for the case where access is completely within the first page. */
1901	size_t cbPage = PAGE_SIZE - ((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK);
1902	if (RT_LIKELY(cb <= cbPage))
1903	{
1904	memcpy(pvDst, pvSrc, cb);
1905	PGMPhysReleasePageMappingLock(pVM, &Lock);
1906	return VINF_SUCCESS;
1907	}
1908
1909	/* copy to the end of the page. */
1910	memcpy(pvDst, pvSrc, cbPage);
1911	PGMPhysReleasePageMappingLock(pVM, &Lock);
1912	GCPtrSrc = (RTGCPTR)((RTGCUINTPTR)GCPtrSrc + cbPage);
1913	pvDst = (uint8_t *)pvDst + cbPage;
1914	cb -= cbPage;
1915
1916	/*
1917	* Page by page.
1918	*/
1919	for (;;)
1920	{
1921	/* map the page */
1922	rc = PGMPhysGCPtr2CCPtrReadOnly(pVM, GCPtrSrc, &pvSrc, &Lock);
1923	if (RT_FAILURE(rc))
1924	return rc;
1925
1926	/* last page? */
1927	if (cb <= PAGE_SIZE)
1928	{
1929	memcpy(pvDst, pvSrc, cb);
1930	PGMPhysReleasePageMappingLock(pVM, &Lock);
1931	return VINF_SUCCESS;
1932	}
1933
1934	/* copy the entire page and advance */
1935	memcpy(pvDst, pvSrc, PAGE_SIZE);
1936	PGMPhysReleasePageMappingLock(pVM, &Lock);
1937	GCPtrSrc = (RTGCPTR)((RTGCUINTPTR)GCPtrSrc + PAGE_SIZE);
1938	pvDst = (uint8_t *)pvDst + PAGE_SIZE;
1939	cb -= PAGE_SIZE;
1940	}
1941	/* won't ever get here. */
1942	}
1943
1944
1945	/**
1946	* Write to guest physical memory referenced by GC pointer.
1947	*
1948	* This function uses the current CR3/CR0/CR4 of the guest and will
1949	* bypass access handlers and not set dirty or accessed bits.
1950	*
1951	* @returns VBox status.
1952	* @param pVM VM handle.
1953	* @param GCPtrDst The destination address (GC pointer).
1954	* @param pvSrc The source address.
1955	* @param cb The number of bytes to write.
1956	*/
1957	VMMDECL(int) PGMPhysSimpleWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
1958	{
1959	/*
1960	* Treat the first page as a special case.
1961	*/
1962	if (!cb)
1963	return VINF_SUCCESS;
1964
1965	/* map the 1st page */
1966	void *pvDst;
1967	PGMPAGEMAPLOCK Lock;
1968	int rc = PGMPhysGCPtr2CCPtr(pVM, GCPtrDst, &pvDst, &Lock);
1969	if (RT_FAILURE(rc))
1970	return rc;
1971
1972	/* optimize for the case where access is completely within the first page. */
1973	size_t cbPage = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
1974	if (RT_LIKELY(cb <= cbPage))
1975	{
1976	memcpy(pvDst, pvSrc, cb);
1977	PGMPhysReleasePageMappingLock(pVM, &Lock);
1978	return VINF_SUCCESS;
1979	}
1980
1981	/* copy to the end of the page. */
1982	memcpy(pvDst, pvSrc, cbPage);
1983	PGMPhysReleasePageMappingLock(pVM, &Lock);
1984	GCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCPtrDst + cbPage);
1985	pvSrc = (const uint8_t *)pvSrc + cbPage;
1986	cb -= cbPage;
1987
1988	/*
1989	* Page by page.
1990	*/
1991	for (;;)
1992	{
1993	/* map the page */
1994	rc = PGMPhysGCPtr2CCPtr(pVM, GCPtrDst, &pvDst, &Lock);
1995	if (RT_FAILURE(rc))
1996	return rc;
1997
1998	/* last page? */
1999	if (cb <= PAGE_SIZE)
2000	{
2001	memcpy(pvDst, pvSrc, cb);
2002	PGMPhysReleasePageMappingLock(pVM, &Lock);
2003	return VINF_SUCCESS;
2004	}
2005
2006	/* copy the entire page and advance */
2007	memcpy(pvDst, pvSrc, PAGE_SIZE);
2008	PGMPhysReleasePageMappingLock(pVM, &Lock);
2009	GCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCPtrDst + PAGE_SIZE);
2010	pvSrc = (const uint8_t *)pvSrc + PAGE_SIZE;
2011	cb -= PAGE_SIZE;
2012	}
2013	/* won't ever get here. */
2014	}
2015
2016
2017	/**
2018	* Write to guest physical memory referenced by GC pointer and update the PTE.
2019	*
2020	* This function uses the current CR3/CR0/CR4 of the guest and will
2021	* bypass access handlers but will set any dirty and accessed bits in the PTE.
2022	*
2023	* If you don't want to set the dirty bit, use PGMPhysSimpleWriteGCPtr().
2024	*
2025	* @returns VBox status.
2026	* @param pVM VM handle.
2027	* @param GCPtrDst The destination address (GC pointer).
2028	* @param pvSrc The source address.
2029	* @param cb The number of bytes to write.
2030	*/
2031	VMMDECL(int) PGMPhysSimpleDirtyWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2032	{
2033	/*
2034	* Treat the first page as a special case.
2035	* Btw. this is the same code as in PGMPhyssimpleWriteGCPtr excep for the PGMGstModifyPage.
2036	*/
2037	if (!cb)
2038	return VINF_SUCCESS;
2039
2040	/* map the 1st page */
2041	void *pvDst;
2042	PGMPAGEMAPLOCK Lock;
2043	int rc = PGMPhysGCPtr2CCPtr(pVM, GCPtrDst, &pvDst, &Lock);
2044	if (RT_FAILURE(rc))
2045	return rc;
2046
2047	/* optimize for the case where access is completely within the first page. */
2048	size_t cbPage = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
2049	if (RT_LIKELY(cb <= cbPage))
2050	{
2051	memcpy(pvDst, pvSrc, cb);
2052	PGMPhysReleasePageMappingLock(pVM, &Lock);
2053	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D)); AssertRC(rc);
2054	return VINF_SUCCESS;
2055	}
2056
2057	/* copy to the end of the page. */
2058	memcpy(pvDst, pvSrc, cbPage);
2059	PGMPhysReleasePageMappingLock(pVM, &Lock);
2060	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D)); AssertRC(rc);
2061	GCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCPtrDst + cbPage);
2062	pvSrc = (const uint8_t *)pvSrc + cbPage;
2063	cb -= cbPage;
2064
2065	/*
2066	* Page by page.
2067	*/
2068	for (;;)
2069	{
2070	/* map the page */
2071	rc = PGMPhysGCPtr2CCPtr(pVM, GCPtrDst, &pvDst, &Lock);
2072	if (RT_FAILURE(rc))
2073	return rc;
2074
2075	/* last page? */
2076	if (cb <= PAGE_SIZE)
2077	{
2078	memcpy(pvDst, pvSrc, cb);
2079	PGMPhysReleasePageMappingLock(pVM, &Lock);
2080	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D)); AssertRC(rc);
2081	return VINF_SUCCESS;
2082	}
2083
2084	/* copy the entire page and advance */
2085	memcpy(pvDst, pvSrc, PAGE_SIZE);
2086	PGMPhysReleasePageMappingLock(pVM, &Lock);
2087	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D)); AssertRC(rc);
2088	GCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCPtrDst + PAGE_SIZE);
2089	pvSrc = (const uint8_t *)pvSrc + PAGE_SIZE;
2090	cb -= PAGE_SIZE;
2091	}
2092	/* won't ever get here. */
2093	}
2094
2095
2096	/**
2097	* Read from guest physical memory referenced by GC pointer.
2098	*
2099	* This function uses the current CR3/CR0/CR4 of the guest and will
2100	* respect access handlers and set accessed bits.
2101	*
2102	* @returns VBox status.
2103	* @param pVM VM handle.
2104	* @param pvDst The destination address.
2105	* @param GCPtrSrc The source address (GC pointer).
2106	* @param cb The number of bytes to read.
2107	*/
2108	VMMDECL(int) PGMPhysReadGCPtr(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
2109	{
2110	RTGCPHYS GCPhys;
2111	int rc;
2112
2113	/*
2114	* Anything to do?
2115	*/
2116	if (!cb)
2117	return VINF_SUCCESS;
2118
2119	LogFlow(("PGMPhysReadGCPtr: %RGv %zu\n", GCPtrSrc, cb));
2120
2121	/*
2122	* Optimize reads within a single page.
2123	*/
2124	if (((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
2125	{
2126	/* Convert virtual to physical address */
2127	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrSrc, &GCPhys);
2128	AssertRCReturn(rc, rc);
2129
2130	/* mark the guest page as accessed. */
2131	rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
2132	AssertRC(rc);
2133
2134	PGMPhysRead(pVM, GCPhys, pvDst, cb);
2135	return VINF_SUCCESS;
2136	}
2137
2138	/*
2139	* Page by page.
2140	*/
2141	for (;;)
2142	{
2143	/* Convert virtual to physical address */
2144	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrSrc, &GCPhys);
2145	AssertRCReturn(rc, rc);
2146
2147	/* mark the guest page as accessed. */
2148	int rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
2149	AssertRC(rc);
2150
2151	/* copy */
2152	size_t cbRead = PAGE_SIZE - ((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK);
2153	if (cbRead >= cb)
2154	{
2155	PGMPhysRead(pVM, GCPhys, pvDst, cb);
2156	return VINF_SUCCESS;
2157	}
2158	PGMPhysRead(pVM, GCPhys, pvDst, cbRead);
2159
2160	/* next */
2161	cb -= cbRead;
2162	pvDst = (uint8_t *)pvDst + cbRead;
2163	GCPtrSrc += cbRead;
2164	}
2165	}
2166
2167
2168	/**
2169	* Write to guest physical memory referenced by GC pointer.
2170	*
2171	* This function uses the current CR3/CR0/CR4 of the guest and will
2172	* respect access handlers and set dirty and accessed bits.
2173	*
2174	* @returns VBox status.
2175	* @param pVM VM handle.
2176	* @param GCPtrDst The destination address (GC pointer).
2177	* @param pvSrc The source address.
2178	* @param cb The number of bytes to write.
2179	*/
2180	VMMDECL(int) PGMPhysWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2181	{
2182	RTGCPHYS GCPhys;
2183	int rc;
2184
2185	/*
2186	* Anything to do?
2187	*/
2188	if (!cb)
2189	return VINF_SUCCESS;
2190
2191	LogFlow(("PGMPhysWriteGCPtr: %RGv %zu\n", GCPtrDst, cb));
2192
2193	/*
2194	* Optimize writes within a single page.
2195	*/
2196	if (((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
2197	{
2198	/* Convert virtual to physical address */
2199	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrDst, &GCPhys);
2200	AssertMsgRCReturn(rc, ("PGMPhysGCPtr2GCPhys failed with %Rrc for %RGv\n", rc, GCPtrDst), rc);
2201
2202	/* mark the guest page as accessed and dirty. */
2203	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2204	AssertRC(rc);
2205
2206	PGMPhysWrite(pVM, GCPhys, pvSrc, cb);
2207	return VINF_SUCCESS;
2208	}
2209
2210	/*
2211	* Page by page.
2212	*/
2213	for (;;)
2214	{
2215	/* Convert virtual to physical address */
2216	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrDst, &GCPhys);
2217	AssertRCReturn(rc, rc);
2218
2219	/* mark the guest page as accessed and dirty. */
2220	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2221	AssertRC(rc);
2222
2223	/* copy */
2224	size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
2225	if (cbWrite >= cb)
2226	{
2227	PGMPhysWrite(pVM, GCPhys, pvSrc, cb);
2228	return VINF_SUCCESS;
2229	}
2230	PGMPhysWrite(pVM, GCPhys, pvSrc, cbWrite);
2231
2232	/* next */
2233	cb -= cbWrite;
2234	pvSrc = (uint8_t *)pvSrc + cbWrite;
2235	GCPtrDst += cbWrite;
2236	}
2237	}
2238
2239	#endif /* !IN_RC */
2240
2241	/**
2242	* Performs a read of guest virtual memory for instruction emulation.
2243	*
2244	* This will check permissions, raise exceptions and update the access bits.
2245	*
2246	* The current implementation will bypass all access handlers. It may later be
2247	* changed to at least respect MMIO.
2248	*
2249	*
2250	* @returns VBox status code suitable to scheduling.
2251	* @retval VINF_SUCCESS if the read was performed successfully.
2252	* @retval VINF_EM_RAW_GUEST_TRAP if an exception was raised but not dispatched yet.
2253	* @retval VINF_TRPM_XCPT_DISPATCHED if an exception was raised and dispatched.
2254	*
2255	* @param pVM The VM handle.
2256	* @param pCtxCore The context core.
2257	* @param pvDst Where to put the bytes we've read.
2258	* @param GCPtrSrc The source address.
2259	* @param cb The number of bytes to read. Not more than a page.
2260	*
2261	* @remark This function will dynamically map physical pages in GC. This may unmap
2262	* mappings done by the caller. Be careful!
2263	*/
2264	VMMDECL(int) PGMPhysInterpretedRead(PVM pVM, PCPUMCTXCORE pCtxCore, void *pvDst, RTGCUINTPTR GCPtrSrc, size_t cb)
2265	{
2266	Assert(cb <= PAGE_SIZE);
2267
2268	/** @todo r=bird: This isn't perfect!
2269	* -# It's not checking for reserved bits being 1.
2270	* -# It's not correctly dealing with the access bit.
2271	* -# It's not respecting MMIO memory or any other access handlers.
2272	*/
2273	/*
2274	* 1. Translate virtual to physical. This may fault.
2275	* 2. Map the physical address.
2276	* 3. Do the read operation.
2277	* 4. Set access bits if required.
2278	*/
2279	int rc;
2280	unsigned cb1 = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
2281	if (cb <= cb1)
2282	{
2283	/*
2284	* Not crossing pages.
2285	*/
2286	RTGCPHYS GCPhys;
2287	uint64_t fFlags;
2288	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc, &fFlags, &GCPhys);
2289	if (RT_SUCCESS(rc))
2290	{
2291	/** @todo we should check reserved bits ... */
2292	void *pvSrc;
2293	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys, &pvSrc);
2294	switch (rc)
2295	{
2296	case VINF_SUCCESS:
2297	Log(("PGMPhysInterpretedRead: pvDst=%p pvSrc=%p cb=%d\n", pvDst, (uint8_t *)pvSrc + (GCPtrSrc & PAGE_OFFSET_MASK), cb));
2298	memcpy(pvDst, (uint8_t *)pvSrc + (GCPtrSrc & PAGE_OFFSET_MASK), cb);
2299	break;
2300	case VERR_PGM_PHYS_PAGE_RESERVED:
2301	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2302	memset(pvDst, 0, cb); /** @todo this is wrong, it should be 0xff */
2303	break;
2304	default:
2305	return rc;
2306	}
2307
2308	/** @todo access bit emulation isn't 100% correct. */
2309	if (!(fFlags & X86_PTE_A))
2310	{
2311	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2312	AssertRC(rc);
2313	}
2314	return VINF_SUCCESS;
2315	}
2316	}
2317	else
2318	{
2319	/*
2320	* Crosses pages.
2321	*/
2322	size_t cb2 = cb - cb1;
2323	uint64_t fFlags1;
2324	RTGCPHYS GCPhys1;
2325	uint64_t fFlags2;
2326	RTGCPHYS GCPhys2;
2327	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc, &fFlags1, &GCPhys1);
2328	if (RT_SUCCESS(rc))
2329	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc + cb1, &fFlags2, &GCPhys2);
2330	if (RT_SUCCESS(rc))
2331	{
2332	/** @todo we should check reserved bits ... */
2333	AssertMsgFailed(("cb=%d cb1=%d cb2=%d GCPtrSrc=%RGv\n", cb, cb1, cb2, GCPtrSrc));
2334	void *pvSrc1;
2335	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys1, &pvSrc1);
2336	switch (rc)
2337	{
2338	case VINF_SUCCESS:
2339	memcpy(pvDst, (uint8_t *)pvSrc1 + (GCPtrSrc & PAGE_OFFSET_MASK), cb1);
2340	break;
2341	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2342	memset(pvDst, 0, cb1); /** @todo this is wrong, it should be 0xff */
2343	break;
2344	default:
2345	return rc;
2346	}
2347
2348	void *pvSrc2;
2349	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys2, &pvSrc2);
2350	switch (rc)
2351	{
2352	case VINF_SUCCESS:
2353	memcpy((uint8_t *)pvDst + cb1, pvSrc2, cb2);
2354	break;
2355	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2356	memset((uint8_t )pvDst + cb1, 0, cb2); /* @todo this is wrong, it should be 0xff */
2357	break;
2358	default:
2359	return rc;
2360	}
2361
2362	if (!(fFlags1 & X86_PTE_A))
2363	{
2364	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2365	AssertRC(rc);
2366	}
2367	if (!(fFlags2 & X86_PTE_A))
2368	{
2369	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc + cb1, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2370	AssertRC(rc);
2371	}
2372	return VINF_SUCCESS;
2373	}
2374	}
2375
2376	/*
2377	* Raise a #PF.
2378	*/
2379	uint32_t uErr;
2380
2381	/* Get the current privilege level. */
2382	uint32_t cpl = CPUMGetGuestCPL(pVM, pCtxCore);
2383	switch (rc)
2384	{
2385	case VINF_SUCCESS:
2386	uErr = (cpl >= 2) ? X86_TRAP_PF_RSVD \| X86_TRAP_PF_US : X86_TRAP_PF_RSVD;
2387	break;
2388
2389	case VERR_PAGE_NOT_PRESENT:
2390	case VERR_PAGE_TABLE_NOT_PRESENT:
2391	uErr = (cpl >= 2) ? X86_TRAP_PF_US : 0;
2392	break;
2393
2394	default:
2395	AssertMsgFailed(("rc=%Rrc GCPtrSrc=%RGv cb=%#x\n", rc, GCPtrSrc, cb));
2396	return rc;
2397	}
2398	Log(("PGMPhysInterpretedRead: GCPtrSrc=%RGv cb=%#x -> #PF(%#x)\n", GCPtrSrc, cb, uErr));
2399	return TRPMRaiseXcptErrCR2(pVM, pCtxCore, X86_XCPT_PF, uErr, GCPtrSrc);
2400	}
2401
2402	/// @todo VMMDECL(int) PGMPhysInterpretedWrite(PVM pVM, PCPUMCTXCORE pCtxCore, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2403
2404

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllPhys.cpp@ 17121

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