PGMAllPhys.cpp@ 10700

Last change on this file since 10700 was 9836, checked in by vboxsync, 17 years ago
Fixed some inconsistencies (thanks Frank)
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 81.7 KB

Line
1	/* $Id: PGMAllPhys.cpp 9836 2008-06-20 08:57:26Z 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	/** @def PGM_IGNORE_RAM_FLAGS_RESERVED
23	* Don't respect the MM_RAM_FLAGS_RESERVED flag when converting to HC addresses.
24	*
25	* Since this flag is currently incorrectly kept set for ROM regions we will
26	* have to ignore it for now so we don't break stuff.
27	*
28	* @todo this has been fixed now I believe, remove this hack.
29	*/
30	#define PGM_IGNORE_RAM_FLAGS_RESERVED
31
32
33	/*******************************************************************************
34	* Header Files *
35	*******************************************************************************/
36	#define LOG_GROUP LOG_GROUP_PGM_PHYS
37	#include <VBox/pgm.h>
38	#include <VBox/trpm.h>
39	#include <VBox/vmm.h>
40	#include <VBox/iom.h>
41	#include <VBox/em.h>
42	#include <VBox/rem.h>
43	#include "PGMInternal.h"
44	#include <VBox/vm.h>
45	#include <VBox/param.h>
46	#include <VBox/err.h>
47	#include <iprt/assert.h>
48	#include <iprt/string.h>
49	#include <iprt/asm.h>
50	#include <VBox/log.h>
51	#ifdef IN_RING3
52	# include <iprt/thread.h>
53	#endif
54
55
56
57	#ifndef IN_RING3
58
59	/**
60	* \#PF Handler callback for Guest ROM range write access.
61	* We simply ignore the writes or fall back to the recompiler if we don't support the instruction.
62	*
63	* @returns VBox status code (appropritate for trap handling and GC return).
64	* @param pVM VM Handle.
65	* @param uErrorCode CPU Error code.
66	* @param pRegFrame Trap register frame.
67	* @param pvFault The fault address (cr2).
68	* @param GCPhysFault The GC physical address corresponding to pvFault.
69	* @param pvUser User argument. Pointer to the ROM range structure.
70	*/
71	PGMDECL(int) pgmPhysRomWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, void pvFault, RTGCPHYS GCPhysFault, void pvUser)
72	{
73	int rc;
74	#ifdef VBOX_WITH_NEW_PHYS_CODE
75	PPGMROMRANGE pRom = (PPGMROMRANGE)pvUser;
76	uint32_t iPage = GCPhysFault - pRom->GCPhys;
77	Assert(iPage < (pRom->cb >> PAGE_SHIFT));
78	switch (pRom->aPages[iPage].enmProt)
79	{
80	case PGMROMPROT_READ_ROM_WRITE_IGNORE:
81	case PGMROMPROT_READ_RAM_WRITE_IGNORE:
82	{
83	#endif
84	/*
85	* If it's a simple instruction which doesn't change the cpu state
86	* we will simply skip it. Otherwise we'll have to defer it to REM.
87	*/
88	uint32_t cbOp;
89	DISCPUSTATE Cpu;
90	rc = EMInterpretDisasOne(pVM, pRegFrame, &Cpu, &cbOp);
91	if ( RT_SUCCESS(rc)
92	&& Cpu.mode == CPUMODE_32BIT /* @todo why does this matter? */
93	&& !(Cpu.prefix & (PREFIX_REPNE \| PREFIX_REP \| PREFIX_SEG)))
94	{
95	switch (Cpu.opcode)
96	{
97	/** @todo Find other instructions we can safely skip, possibly
98	* adding this kind of detection to DIS or EM. */
99	case OP_MOV:
100	pRegFrame->rip += cbOp;
101	STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestROMWriteHandled);
102	return VINF_SUCCESS;
103	}
104	}
105	else if (RT_UNLIKELY(rc == VERR_INTERNAL_ERROR))
106	return rc;
107	#ifdef VBOX_WITH_NEW_PHYS_CODE
108	break;
109	}
110
111	case PGMROMPROT_READ_RAM_WRITE_RAM:
112	rc = PGMHandlerPhysicalPageTempOff(pVM, pRom->GCPhys, GCPhysFault & X86_PTE_PG_MASK);
113	AssertRC(rc);
114	case PGMROMPROT_READ_ROM_WRITE_RAM:
115	/* Handle it in ring-3 because it's way easier there. */
116	break;
117
118	default:
119	AssertMsgFailedReturn(("enmProt=%d iPage=%d GCPhysFault=%RGp\n",
120	pRom->aPages[iPage].enmProt, iPage, GCPhysFault),
121	VERR_INTERNAL_ERROR);
122	}
123	#endif
124
125	STAM_COUNTER_INC(&pVM->pgm.s.StatGCGuestROMWriteUnhandled);
126	return VINF_EM_RAW_EMULATE_INSTR;
127	}
128
129	#endif /* IN_RING3 */
130
131	/**
132	* Checks if Address Gate 20 is enabled or not.
133	*
134	* @returns true if enabled.
135	* @returns false if disabled.
136	* @param pVM VM handle.
137	*/
138	PGMDECL(bool) PGMPhysIsA20Enabled(PVM pVM)
139	{
140	LogFlow(("PGMPhysIsA20Enabled %d\n", pVM->pgm.s.fA20Enabled));
141	return !!pVM->pgm.s.fA20Enabled ; /* stupid MS compiler doesn't trust me. */
142	}
143
144
145	/**
146	* Validates a GC physical address.
147	*
148	* @returns true if valid.
149	* @returns false if invalid.
150	* @param pVM The VM handle.
151	* @param GCPhys The physical address to validate.
152	*/
153	PGMDECL(bool) PGMPhysIsGCPhysValid(PVM pVM, RTGCPHYS GCPhys)
154	{
155	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
156	return pPage != NULL;
157	}
158
159
160	/**
161	* Checks if a GC physical address is a normal page,
162	* i.e. not ROM, MMIO or reserved.
163	*
164	* @returns true if normal.
165	* @returns false if invalid, ROM, MMIO or reserved page.
166	* @param pVM The VM handle.
167	* @param GCPhys The physical address to check.
168	*/
169	PGMDECL(bool) PGMPhysIsGCPhysNormal(PVM pVM, RTGCPHYS GCPhys)
170	{
171	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
172	return pPage
173	&& !(pPage->HCPhys & (MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO2));
174	}
175
176
177	/**
178	* Converts a GC physical address to a HC physical address.
179	*
180	* @returns VINF_SUCCESS on success.
181	* @returns VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical
182	* page but has no physical backing.
183	* @returns VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid
184	* GC physical address.
185	*
186	* @param pVM The VM handle.
187	* @param GCPhys The GC physical address to convert.
188	* @param pHCPhys Where to store the HC physical address on success.
189	*/
190	PGMDECL(int) PGMPhysGCPhys2HCPhys(PVM pVM, RTGCPHYS GCPhys, PRTHCPHYS pHCPhys)
191	{
192	PPGMPAGE pPage;
193	int rc = pgmPhysGetPageEx(&pVM->pgm.s, GCPhys, &pPage);
194	if (VBOX_FAILURE(rc))
195	return rc;
196
197	#ifndef PGM_IGNORE_RAM_FLAGS_RESERVED
198	if (RT_UNLIKELY(pPage->HCPhys & MM_RAM_FLAGS_RESERVED)) /** @todo PAGE FLAGS */
199	return VERR_PGM_PHYS_PAGE_RESERVED;
200	#endif
201
202	*pHCPhys = PGM_PAGE_GET_HCPHYS(pPage) \| (GCPhys & PAGE_OFFSET_MASK);
203	return VINF_SUCCESS;
204	}
205
206
207	/**
208	* Invalidates the GC page mapping TLB.
209	*
210	* @param pVM The VM handle.
211	*/
212	PDMDECL(void) PGMPhysInvalidatePageGCMapTLB(PVM pVM)
213	{
214	/* later */
215	NOREF(pVM);
216	}
217
218
219	/**
220	* Invalidates the ring-0 page mapping TLB.
221	*
222	* @param pVM The VM handle.
223	*/
224	PDMDECL(void) PGMPhysInvalidatePageR0MapTLB(PVM pVM)
225	{
226	PGMPhysInvalidatePageR3MapTLB(pVM);
227	}
228
229
230	/**
231	* Invalidates the ring-3 page mapping TLB.
232	*
233	* @param pVM The VM handle.
234	*/
235	PDMDECL(void) PGMPhysInvalidatePageR3MapTLB(PVM pVM)
236	{
237	pgmLock(pVM);
238	for (unsigned i = 0; i < RT_ELEMENTS(pVM->pgm.s.PhysTlbHC.aEntries); i++)
239	{
240	pVM->pgm.s.PhysTlbHC.aEntries[i].GCPhys = NIL_RTGCPHYS;
241	pVM->pgm.s.PhysTlbHC.aEntries[i].pPage = 0;
242	pVM->pgm.s.PhysTlbHC.aEntries[i].pMap = 0;
243	pVM->pgm.s.PhysTlbHC.aEntries[i].pv = 0;
244	}
245	pgmUnlock(pVM);
246	}
247
248
249	/**
250	* Frees the specified RAM page.
251	*
252	* This is used by ballooning and remapping MMIO2.
253	*
254	* @param pVM Pointer to the shared VM structure.
255	* @param pPage Pointer to the page structure.
256	* @param GCPhys The guest physical address of the page, if applicable.
257	*/
258	void pgmPhysFreePage(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
259	{
260	AssertFatal(PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM);
261
262	/** @todo implement this... */
263	AssertFatalFailed();
264	}
265
266
267
268	/**
269	* Makes sure that there is at least one handy page ready for use.
270	*
271	* This will also take the appropriate actions when reaching water-marks.
272	*
273	* @returns The following VBox status codes.
274	* @retval VINF_SUCCESS on success.
275	* @retval VERR_EM_NO_MEMORY if we're really out of memory.
276	*
277	* @param pVM The VM handle.
278	*
279	* @remarks Must be called from within the PGM critical section. It may
280	* nip back to ring-3/0 in some cases.
281	*/
282	static int pgmPhysEnsureHandyPage(PVM pVM)
283	{
284	/** @remarks
285	* low-water mark logic for R0 & GC:
286	* - 75%: Set FF.
287	* - 50%: Force return to ring-3 ASAP.
288	*
289	* For ring-3 there is a little problem wrt to the recompiler, so:
290	* - 75%: Set FF.
291	* - 50%: Try allocate pages; on failure we'll force REM to quite ASAP.
292	*
293	* The basic idea is that we should be able to get out of any situation with
294	* only 50% of handy pages remaining.
295	*
296	* At the moment we'll not adjust the number of handy pages relative to the
297	* actual VM RAM committment, that's too much work for now.
298	*/
299	Assert(pVM->pgm.s.cHandyPages <= RT_ELEMENTS(pVM->pgm.s.aHandyPages));
300	if ( !pVM->pgm.s.cHandyPages
301	#ifdef IN_RING3
302	\|\| pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 2 /* 50% */
303	#endif
304	)
305	{
306	Log(("PGM: cHandyPages=%u out of %u -> allocate more\n", pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages)));
307	#ifdef IN_RING3
308	int rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_PGM_ALLOCATE_HANDY_PAGES, 0, NULL);
309	#elif defined(IN_RING0)
310	/** @todo call PGMR0PhysAllocateHandyPages directly - need to make sure we can call kernel code first and deal with the seeding fallback. */
311	int rc = VMMR0CallHost(pVM, VMMCALLHOST_PGM_ALLOCATE_HANDY_PAGES, 0);
312	#else
313	int rc = VMMGCCallHost(pVM, VMMCALLHOST_PGM_ALLOCATE_HANDY_PAGES, 0);
314	#endif
315	if (RT_UNLIKELY(rc != VINF_SUCCESS))
316	{
317	Assert(rc == VINF_EM_NO_MEMORY);
318	if (!pVM->pgm.s.cHandyPages)
319	{
320	LogRel(("PGM: no more handy pages!\n"));
321	return VERR_EM_NO_MEMORY;
322	}
323	Assert(VM_FF_ISSET(pVM, VM_FF_PGM_NEED_HANDY_PAGES));
324	#ifdef IN_RING3
325	REMR3NotifyFF(pVM);
326	#else
327	VM_FF_SET(pVM, VM_FF_TO_R3);
328	#endif
329	}
330	Assert(pVM->pgm.s.cHandyPages <= RT_ELEMENTS(pVM->pgm.s.aHandyPages));
331	}
332	else if (pVM->pgm.s.cHandyPages - 1 <= (RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 4) * 3) /* 75% */
333	{
334	VM_FF_SET(pVM, VM_FF_PGM_NEED_HANDY_PAGES);
335	#ifndef IN_RING3
336	if (pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages) / 2)
337	{
338	Log(("PGM: VM_FF_TO_R3 - cHandyPages=%u out of %u\n", pVM->pgm.s.cHandyPages - 1 <= RT_ELEMENTS(pVM->pgm.s.aHandyPages)));
339	VM_FF_SET(pVM, VM_FF_TO_R3);
340	}
341	#endif
342	}
343
344	return VINF_SUCCESS;
345	}
346
347
348	/**
349	* Replace a zero or shared page with new page that we can write to.
350	*
351	* @returns The following VBox status codes.
352	* @retval VINF_SUCCESS on success, pPage is modified.
353	* @retval VERR_EM_NO_MEMORY if we're totally out of memory.
354	*
355	* @todo Propagate VERR_EM_NO_MEMORY up the call tree.
356	*
357	* @param pVM The VM address.
358	* @param pPage The physical page tracking structure. This will
359	* be modified on success.
360	* @param GCPhys The address of the page.
361	*
362	* @remarks Must be called from within the PGM critical section. It may
363	* nip back to ring-3/0 in some cases.
364	*
365	* @remarks This function shouldn't really fail, however if it does
366	* it probably means we've screwed up the size of the amount
367	* and/or the low-water mark of handy pages. Or, that some
368	* device I/O is causing a lot of pages to be allocated while
369	* while the host is in a low-memory condition.
370	*/
371	int pgmPhysAllocPage(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
372	{
373	/*
374	* Ensure that we've got a page handy, take it and use it.
375	*/
376	int rc = pgmPhysEnsureHandyPage(pVM);
377	if (VBOX_FAILURE(rc))
378	{
379	Assert(rc == VERR_EM_NO_MEMORY);
380	return rc;
381	}
382	AssertMsg(PGM_PAGE_IS_ZERO(pPage) \|\| PGM_PAGE_IS_SHARED(pPage), ("%d %RGp\n", PGM_PAGE_GET_STATE(pPage), GCPhys));
383	Assert(!PGM_PAGE_IS_RESERVED(pPage));
384	Assert(!PGM_PAGE_IS_MMIO(pPage));
385
386	uint32_t iHandyPage = --pVM->pgm.s.cHandyPages;
387	Assert(iHandyPage < RT_ELEMENTS(pVM->pgm.s.aHandyPages));
388	Assert(pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys != NIL_RTHCPHYS);
389	Assert(!(pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
390	Assert(pVM->pgm.s.aHandyPages[iHandyPage].idPage != NIL_GMM_PAGEID);
391	Assert(pVM->pgm.s.aHandyPages[iHandyPage].idSharedPage == NIL_GMM_PAGEID);
392
393	/*
394	* There are one or two action to be taken the next time we allocate handy pages:
395	* - Tell the GMM (global memory manager) what the page is being used for.
396	* (Speeds up replacement operations - sharing and defragmenting.)
397	* - If the current backing is shared, it must be freed.
398	*/
399	const RTHCPHYS HCPhys = pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys;
400	pVM->pgm.s.aHandyPages[iHandyPage].HCPhysGCPhys = GCPhys;
401
402	if (PGM_PAGE_IS_SHARED(pPage))
403	{
404	pVM->pgm.s.aHandyPages[iHandyPage].idSharedPage = PGM_PAGE_GET_PAGEID(pPage);
405	Assert(PGM_PAGE_GET_PAGEID(pPage) != NIL_GMM_PAGEID);
406	VM_FF_SET(pVM, VM_FF_PGM_NEED_HANDY_PAGES);
407
408	Log2(("PGM: Replaced shared page %#x at %RGp with %#x / %RHp\n", PGM_PAGE_GET_PAGEID(pPage),
409	GCPhys, pVM->pgm.s.aHandyPages[iHandyPage].idPage, HCPhys));
410	STAM_COUNTER_INC(&pVM->pgm.s.StatPageReplaceShared);
411	pVM->pgm.s.cSharedPages--;
412	/** @todo err.. what about copying the page content? */
413	}
414	else
415	{
416	Log2(("PGM: Replaced zero page %RGp with %#x / %RHp\n", GCPhys, pVM->pgm.s.aHandyPages[iHandyPage].idPage, HCPhys));
417	STAM_COUNTER_INC(&pVM->pgm.s.StatPageReplaceZero);
418	pVM->pgm.s.cZeroPages--;
419	/** @todo verify that the handy page is zero! */
420	}
421
422	/*
423	* Do the PGMPAGE modifications.
424	*/
425	pVM->pgm.s.cPrivatePages++;
426	PGM_PAGE_SET_HCPHYS(pPage, HCPhys);
427	PGM_PAGE_SET_PAGEID(pPage, pVM->pgm.s.aHandyPages[iHandyPage].idPage);
428	PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_ALLOCATED);
429
430	return VINF_SUCCESS;
431	}
432
433
434	/**
435	* Deal with pages that are not writable, i.e. not in the ALLOCATED state.
436	*
437	* @returns VBox status code.
438	* @retval VINF_SUCCESS on success.
439	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
440	*
441	* @param pVM The VM address.
442	* @param pPage The physical page tracking structure.
443	* @param GCPhys The address of the page.
444	*
445	* @remarks Called from within the PGM critical section.
446	*/
447	int pgmPhysPageMakeWritable(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys)
448	{
449	switch (PGM_PAGE_GET_STATE(pPage))
450	{
451	case PGM_PAGE_STATE_WRITE_MONITORED:
452	PGM_PAGE_SET_WRITTEN_TO(pPage);
453	PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_ALLOCATED);
454	/* fall thru */
455	default: /* to shut up GCC */
456	case PGM_PAGE_STATE_ALLOCATED:
457	return VINF_SUCCESS;
458
459	/*
460	* Zero pages can be dummy pages for MMIO or reserved memory,
461	* so we need to check the flags before joining cause with
462	* shared page replacement.
463	*/
464	case PGM_PAGE_STATE_ZERO:
465	if ( PGM_PAGE_IS_MMIO(pPage)
466	\|\| PGM_PAGE_IS_RESERVED(pPage))
467	return VERR_PGM_PHYS_PAGE_RESERVED;
468	/* fall thru */
469	case PGM_PAGE_STATE_SHARED:
470	return pgmPhysAllocPage(pVM, pPage, GCPhys);
471	}
472	}
473
474
475	/**
476	* Maps a page into the current virtual address space so it can be accessed.
477	*
478	* @returns VBox status code.
479	* @retval VINF_SUCCESS on success.
480	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
481	*
482	* @param pVM The VM address.
483	* @param pPage The physical page tracking structure.
484	* @param GCPhys The address of the page.
485	* @param ppMap Where to store the address of the mapping tracking structure.
486	* @param ppv Where to store the mapping address of the page. The page
487	* offset is masked off!
488	*
489	* @remarks Called from within the PGM critical section.
490	*/
491	int pgmPhysPageMap(PVM pVM, PPGMPAGE pPage, RTGCPHYS GCPhys, PPPGMPAGEMAP ppMap, void **ppv)
492	{
493	#ifdef IN_GC
494	/*
495	* Just some sketchy GC code.
496	*/
497	*ppMap = NULL;
498	RTHCPHYS HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
499	Assert(HCPhys != pVM->pgm.s.HCPhysZeroPg);
500	return PGMGCDynMapHCPage(pVM, HCPhys, ppv);
501
502	#else /* IN_RING3 \|\| IN_RING0 */
503
504	/*
505	* Find/make Chunk TLB entry for the mapping chunk.
506	*/
507	PPGMCHUNKR3MAP pMap;
508	const uint32_t idChunk = PGM_PAGE_GET_CHUNKID(pPage);
509	PPGMCHUNKR3MAPTLBE pTlbe = &pVM->pgm.s.ChunkR3Map.Tlb.aEntries[PGM_CHUNKR3MAPTLB_IDX(idChunk)];
510	if (pTlbe->idChunk == idChunk)
511	{
512	STAM_COUNTER_INC(&pVM->pgm.s.StatChunkR3MapTlbHits);
513	pMap = pTlbe->pChunk;
514	}
515	else if (idChunk != NIL_GMM_CHUNKID)
516	{
517	STAM_COUNTER_INC(&pVM->pgm.s.StatChunkR3MapTlbMisses);
518
519	/*
520	* Find the chunk, map it if necessary.
521	*/
522	pMap = (PPGMCHUNKR3MAP)RTAvlU32Get(&pVM->pgm.s.ChunkR3Map.pTree, idChunk);
523	if (!pMap)
524	{
525	#ifdef IN_RING0
526	int rc = VMMR0CallHost(pVM, VMMCALLHOST_PGM_MAP_CHUNK, idChunk);
527	AssertRCReturn(rc, rc);
528	pMap = (PPGMCHUNKR3MAP)RTAvlU32Get(&pVM->pgm.s.ChunkR3Map.pTree, idChunk);
529	Assert(pMap);
530	#else
531	int rc = pgmR3PhysChunkMap(pVM, idChunk, &pMap);
532	if (VBOX_FAILURE(rc))
533	return rc;
534	#endif
535	}
536
537	/*
538	* Enter it into the Chunk TLB.
539	*/
540	pTlbe->idChunk = idChunk;
541	pTlbe->pChunk = pMap;
542	pMap->iAge = 0;
543	}
544	else
545	{
546	Assert(PGM_PAGE_IS_ZERO(pPage));
547	*ppv = pVM->pgm.s.CTXALLSUFF(pvZeroPg);
548	*ppMap = NULL;
549	return VINF_SUCCESS;
550	}
551
552	ppv = (uint8_t )pMap->pv + (PGM_PAGE_GET_PAGE_IN_CHUNK(pPage) << PAGE_SHIFT);
553	*ppMap = pMap;
554	return VINF_SUCCESS;
555	#endif /* IN_RING3 */
556	}
557
558
559	#ifndef IN_GC
560	/**
561	* Load a guest page into the ring-3 physical TLB.
562	*
563	* @returns VBox status code.
564	* @retval VINF_SUCCESS on success
565	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
566	* @param pPGM The PGM instance pointer.
567	* @param GCPhys The guest physical address in question.
568	*/
569	int pgmPhysPageLoadIntoTlb(PPGM pPGM, RTGCPHYS GCPhys)
570	{
571	STAM_COUNTER_INC(&pPGM->CTXMID(StatPage,MapTlbMisses));
572
573	/*
574	* Find the ram range.
575	* 99.8% of requests are expected to be in the first range.
576	*/
577	PPGMRAMRANGE pRam = CTXALLSUFF(pPGM->pRamRanges);
578	RTGCPHYS off = GCPhys - pRam->GCPhys;
579	if (RT_UNLIKELY(off >= pRam->cb))
580	{
581	do
582	{
583	pRam = CTXALLSUFF(pRam->pNext);
584	if (!pRam)
585	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
586	off = GCPhys - pRam->GCPhys;
587	} while (off >= pRam->cb);
588	}
589
590	/*
591	* Map the page.
592	* Make a special case for the zero page as it is kind of special.
593	*/
594	PPGMPAGE pPage = &pRam->aPages[off >> PAGE_SHIFT];
595	PPGMPAGEMAPTLBE pTlbe = &pPGM->CTXSUFF(PhysTlb).aEntries[PGM_PAGEMAPTLB_IDX(GCPhys)];
596	if (!PGM_PAGE_IS_ZERO(pPage))
597	{
598	void *pv;
599	PPGMPAGEMAP pMap;
600	int rc = pgmPhysPageMap(PGM2VM(pPGM), pPage, GCPhys, &pMap, &pv);
601	if (VBOX_FAILURE(rc))
602	return rc;
603	pTlbe->pMap = pMap;
604	pTlbe->pv = pv;
605	}
606	else
607	{
608	Assert(PGM_PAGE_GET_HCPHYS(pPage) == pPGM->HCPhysZeroPg);
609	pTlbe->pMap = NULL;
610	pTlbe->pv = pPGM->CTXALLSUFF(pvZeroPg);
611	}
612	pTlbe->pPage = pPage;
613	return VINF_SUCCESS;
614	}
615	#endif /* !IN_GC */
616
617
618	/**
619	* Requests the mapping of a guest page into the current context.
620	*
621	* This API should only be used for very short term, as it will consume
622	* scarse resources (R0 and GC) in the mapping cache. When you're done
623	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
624	*
625	* This API will assume your intention is to write to the page, and will
626	* therefore replace shared and zero pages. If you do not intend to modify
627	* the page, use the PGMPhysGCPhys2CCPtrReadOnly() API.
628	*
629	* @returns VBox status code.
630	* @retval VINF_SUCCESS on success.
631	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
632	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
633	*
634	* @param pVM The VM handle.
635	* @param GCPhys The guest physical address of the page that should be mapped.
636	* @param ppv Where to store the address corresponding to GCPhys.
637	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
638	*
639	* @remark Avoid calling this API from within critical sections (other than
640	* the PGM one) because of the deadlock risk.
641	* @thread Any thread.
642	*/
643	PGMDECL(int) PGMPhysGCPhys2CCPtr(PVM pVM, RTGCPHYS GCPhys, void **ppv, PPGMPAGEMAPLOCK pLock)
644	{
645	#ifdef VBOX_WITH_NEW_PHYS_CODE
646	#ifdef IN_GC
647	/* Until a physical TLB is implemented for GC, let PGMGCDynMapGCPageEx handle it. */
648	return PGMGCDynMapGCPageEx(pVM, GCPhys, ppv);
649	#else
650	int rc = pgmLock(pVM);
651	AssertRCReturn(rc);
652
653	/*
654	* Query the Physical TLB entry for the page (may fail).
655	*/
656	PGMPHYSTLBE pTlbe;
657	int rc = pgmPhysPageQueryTlbe(&pVM->pgm.s, GCPhys, &pTlbe);
658	if (RT_SUCCESS(rc))
659	{
660	/*
661	* If the page is shared, the zero page, or being write monitored
662	* it must be converted to an page that's writable if possible.
663	*/
664	PPGMPAGE pPage = pTlbe->pPage;
665	if (RT_UNLIKELY(PGM_PAGE_GET_STATE(pPage) != PGM_PAGE_STATE_ALLOCATED))
666	{
667	rc = pgmPhysPageMakeWritable(pVM, pPage, GCPhys);
668	/** @todo stuff is missing here! */
669	}
670	if (RT_SUCCESS(rc))
671	{
672	/*
673	* Now, just perform the locking and calculate the return address.
674	*/
675	PPGMPAGEMAP pMap = pTlbe->pMap;
676	pMap->cRefs++;
677	if (RT_LIKELY(pPage->cLocks != PGM_PAGE_MAX_LOCKS))
678	if (RT_UNLIKELY(++pPage->cLocks == PGM_PAGE_MAX_LOCKS))
679	{
680	AssertMsgFailed(("%VGp is entering permanent locked state!\n", GCPhys));
681	pMap->cRefs++; /* Extra ref to prevent it from going away. */
682	}
683
684	ppv = (void )((uintptr_t)pTlbe->pv \| (GCPhys & PAGE_OFFSET_MASK));
685	pLock->pvPage = pPage;
686	pLock->pvMap = pMap;
687	}
688	}
689
690	pgmUnlock(pVM);
691	return rc;
692
693	#endif /* IN_RING3 \|\| IN_RING0 */
694
695	#else
696	/*
697	* Temporary fallback code.
698	*/
699	# ifdef IN_GC
700	return PGMGCDynMapGCPageEx(pVM, GCPhys, ppv);
701	# else
702	return PGMPhysGCPhys2HCPtr(pVM, GCPhys, 1, ppv);
703	# endif
704	#endif
705	}
706
707
708	/**
709	* Requests the mapping of a guest page into the current context.
710	*
711	* This API should only be used for very short term, as it will consume
712	* scarse resources (R0 and GC) in the mapping cache. When you're done
713	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
714	*
715	* @returns VBox status code.
716	* @retval VINF_SUCCESS on success.
717	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
718	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
719	*
720	* @param pVM The VM handle.
721	* @param GCPhys The guest physical address of the page that should be mapped.
722	* @param ppv Where to store the address corresponding to GCPhys.
723	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
724	*
725	* @remark Avoid calling this API from within critical sections (other than
726	* the PGM one) because of the deadlock risk.
727	* @thread Any thread.
728	*/
729	PGMDECL(int) PGMPhysGCPhys2CCPtrReadOnly(PVM pVM, RTGCPHYS GCPhys, void const **ppv, PPGMPAGEMAPLOCK pLock)
730	{
731	/** @todo implement this */
732	return PGMPhysGCPhys2CCPtr(pVM, GCPhys, (void **)ppv, pLock);
733	}
734
735
736	/**
737	* Requests the mapping of a guest page given by virtual address into the current context.
738	*
739	* This API should only be used for very short term, as it will consume
740	* scarse resources (R0 and GC) in the mapping cache. When you're done
741	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
742	*
743	* This API will assume your intention is to write to the page, and will
744	* therefore replace shared and zero pages. If you do not intend to modify
745	* the page, use the PGMPhysGCPtr2CCPtrReadOnly() API.
746	*
747	* @returns VBox status code.
748	* @retval VINF_SUCCESS on success.
749	* @retval VERR_PAGE_TABLE_NOT_PRESENT if the page directory for the virtual address isn't present.
750	* @retval VERR_PAGE_NOT_PRESENT if the page at the virtual address isn't present.
751	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
752	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
753	*
754	* @param pVM The VM handle.
755	* @param GCPhys The guest physical address of the page that should be mapped.
756	* @param ppv Where to store the address corresponding to GCPhys.
757	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
758	*
759	* @remark Avoid calling this API from within critical sections (other than
760	* the PGM one) because of the deadlock risk.
761	* @thread EMT
762	*/
763	PGMDECL(int) PGMPhysGCPtr2CCPtr(PVM pVM, RTGCPTR GCPtr, void **ppv, PPGMPAGEMAPLOCK pLock)
764	{
765	RTGCPHYS GCPhys;
766	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
767	if (VBOX_SUCCESS(rc))
768	rc = PGMPhysGCPhys2CCPtr(pVM, GCPhys, ppv, pLock);
769	return rc;
770	}
771
772
773	/**
774	* Requests the mapping of a guest page given by virtual address into the current context.
775	*
776	* This API should only be used for very short term, as it will consume
777	* scarse resources (R0 and GC) in the mapping cache. When you're done
778	* with the page, call PGMPhysReleasePageMappingLock() ASAP to release it.
779	*
780	* @returns VBox status code.
781	* @retval VINF_SUCCESS on success.
782	* @retval VERR_PAGE_TABLE_NOT_PRESENT if the page directory for the virtual address isn't present.
783	* @retval VERR_PAGE_NOT_PRESENT if the page at the virtual address isn't present.
784	* @retval VERR_PGM_PHYS_PAGE_RESERVED it it's a valid page but has no physical backing.
785	* @retval VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid physical address.
786	*
787	* @param pVM The VM handle.
788	* @param GCPhys The guest physical address of the page that should be mapped.
789	* @param ppv Where to store the address corresponding to GCPhys.
790	* @param pLock Where to store the lock information that PGMPhysReleasePageMappingLock needs.
791	*
792	* @remark Avoid calling this API from within critical sections (other than
793	* the PGM one) because of the deadlock risk.
794	* @thread EMT
795	*/
796	PGMDECL(int) PGMPhysGCPtr2CCPtrReadOnly(PVM pVM, RTGCPTR GCPtr, void const **ppv, PPGMPAGEMAPLOCK pLock)
797	{
798	RTGCPHYS GCPhys;
799	int rc = PGMPhysGCPtr2GCPhys(pVM, GCPtr, &GCPhys);
800	if (VBOX_SUCCESS(rc))
801	rc = PGMPhysGCPhys2CCPtrReadOnly(pVM, GCPhys, ppv, pLock);
802	return rc;
803	}
804
805
806	/**
807	* Release the mapping of a guest page.
808	*
809	* This is the counter part of PGMPhysGCPhys2CCPtr, PGMPhysGCPhys2CCPtrReadOnly
810	* PGMPhysGCPtr2CCPtr and PGMPhysGCPtr2CCPtrReadOnly.
811	*
812	* @param pVM The VM handle.
813	* @param pLock The lock structure initialized by the mapping function.
814	*/
815	PGMDECL(void) PGMPhysReleasePageMappingLock(PVM pVM, PPGMPAGEMAPLOCK pLock)
816	{
817	#ifdef VBOX_WITH_NEW_PHYS_CODE
818	#ifdef IN_GC
819	/* currently nothing to do here. */
820	/* --- postponed
821	#elif defined(IN_RING0)
822	*/
823
824	#else /* IN_RING3 */
825	pgmLock(pVM);
826
827	PPGMPAGE pPage = (PPGMPAGE)pLock->pvPage;
828	Assert(pPage->cLocks >= 1);
829	if (pPage->cLocks != PGM_PAGE_MAX_LOCKS)
830	pPage->cLocks--;
831
832	PPGMCHUNKR3MAP pChunk = (PPGMCHUNKR3MAP)pLock->pvChunk;
833	Assert(pChunk->cRefs >= 1);
834	pChunk->cRefs--;
835	pChunk->iAge = 0;
836
837	pgmUnlock(pVM);
838	#endif /* IN_RING3 */
839	#else
840	NOREF(pVM);
841	NOREF(pLock);
842	#endif
843	}
844
845
846	/**
847	* Converts a GC physical address to a HC pointer.
848	*
849	* @returns VINF_SUCCESS on success.
850	* @returns VERR_PGM_PHYS_PAGE_RESERVED it it's a valid GC physical
851	* page but has no physical backing.
852	* @returns VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS if it's not a valid
853	* GC physical address.
854	* @returns VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY if the range crosses
855	* a dynamic ram chunk boundary
856	* @param pVM The VM handle.
857	* @param GCPhys The GC physical address to convert.
858	* @param cbRange Physical range
859	* @param pHCPtr Where to store the HC pointer on success.
860	*/
861	PGMDECL(int) PGMPhysGCPhys2HCPtr(PVM pVM, RTGCPHYS GCPhys, RTUINT cbRange, PRTHCPTR pHCPtr)
862	{
863	#ifdef VBOX_WITH_NEW_PHYS_CODE
864	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
865	#endif
866
867	if ((GCPhys & PGM_DYNAMIC_CHUNK_BASE_MASK) != ((GCPhys+cbRange-1) & PGM_DYNAMIC_CHUNK_BASE_MASK))
868	{
869	AssertMsgFailed(("%VGp - %VGp crosses a chunk boundary!!\n", GCPhys, GCPhys+cbRange));
870	LogRel(("PGMPhysGCPhys2HCPtr %VGp - %VGp crosses a chunk boundary!!\n", GCPhys, GCPhys+cbRange));
871	return VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY;
872	}
873
874	PPGMRAMRANGE pRam;
875	PPGMPAGE pPage;
876	int rc = pgmPhysGetPageAndRangeEx(&pVM->pgm.s, GCPhys, &pPage, &pRam);
877	if (VBOX_FAILURE(rc))
878	return rc;
879
880	#ifndef PGM_IGNORE_RAM_FLAGS_RESERVED
881	if (RT_UNLIKELY(PGM_PAGE_IS_RESERVED(pPage)))
882	return VERR_PGM_PHYS_PAGE_RESERVED;
883	#endif
884
885	RTGCPHYS off = GCPhys - pRam->GCPhys;
886	if (RT_UNLIKELY(off + cbRange > pRam->cb))
887	{
888	AssertMsgFailed(("%VGp - %VGp crosses a chunk boundary!!\n", GCPhys, GCPhys + cbRange));
889	return VERR_PGM_GCPHYS_RANGE_CROSSES_BOUNDARY;
890	}
891
892	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
893	{
894	unsigned iChunk = (off >> PGM_DYNAMIC_CHUNK_SHIFT);
895	*pHCPtr = (RTHCPTR)((RTHCUINTPTR)CTXSUFF(pRam->pavHCChunk)[iChunk] + (off & PGM_DYNAMIC_CHUNK_OFFSET_MASK));
896	}
897	else if (RT_LIKELY(pRam->pvHC))
898	*pHCPtr = (RTHCPTR)((RTHCUINTPTR)pRam->pvHC + off);
899	else
900	return VERR_PGM_PHYS_PAGE_RESERVED;
901	return VINF_SUCCESS;
902	}
903
904
905	/**
906	* Converts a guest pointer to a GC physical address.
907	*
908	* This uses the current CR3/CR0/CR4 of the guest.
909	*
910	* @returns VBox status code.
911	* @param pVM The VM Handle
912	* @param GCPtr The guest pointer to convert.
913	* @param pGCPhys Where to store the GC physical address.
914	*/
915	PGMDECL(int) PGMPhysGCPtr2GCPhys(PVM pVM, RTGCPTR GCPtr, PRTGCPHYS pGCPhys)
916	{
917	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, pGCPhys);
918	if (pGCPhys && VBOX_SUCCESS(rc))
919	*pGCPhys \|= (RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK;
920	return rc;
921	}
922
923
924	/**
925	* Converts a guest pointer to a HC physical address.
926	*
927	* This uses the current CR3/CR0/CR4 of the guest.
928	*
929	* @returns VBox status code.
930	* @param pVM The VM Handle
931	* @param GCPtr The guest pointer to convert.
932	* @param pHCPhys Where to store the HC physical address.
933	*/
934	PGMDECL(int) PGMPhysGCPtr2HCPhys(PVM pVM, RTGCPTR GCPtr, PRTHCPHYS pHCPhys)
935	{
936	RTGCPHYS GCPhys;
937	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, &GCPhys);
938	if (VBOX_SUCCESS(rc))
939	rc = PGMPhysGCPhys2HCPhys(pVM, GCPhys \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), pHCPhys);
940	return rc;
941	}
942
943
944	/**
945	* Converts a guest pointer to a HC pointer.
946	*
947	* This uses the current CR3/CR0/CR4 of the guest.
948	*
949	* @returns VBox status code.
950	* @param pVM The VM Handle
951	* @param GCPtr The guest pointer to convert.
952	* @param pHCPtr Where to store the HC virtual address.
953	*/
954	PGMDECL(int) PGMPhysGCPtr2HCPtr(PVM pVM, RTGCPTR GCPtr, PRTHCPTR pHCPtr)
955	{
956	#ifdef VBOX_WITH_NEW_PHYS_CODE
957	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
958	#endif
959
960	RTGCPHYS GCPhys;
961	int rc = PGM_GST_PFN(GetPage,pVM)(pVM, (RTGCUINTPTR)GCPtr, NULL, &GCPhys);
962	if (VBOX_SUCCESS(rc))
963	rc = PGMPhysGCPhys2HCPtr(pVM, GCPhys \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), 1 /* we always stay within one page */, pHCPtr);
964	return rc;
965	}
966
967
968	/**
969	* Converts a guest virtual address to a HC pointer by specfied CR3 and flags.
970	*
971	* @returns VBox status code.
972	* @param pVM The VM Handle
973	* @param GCPtr The guest pointer to convert.
974	* @param cr3 The guest CR3.
975	* @param fFlags Flags used for interpreting the PD correctly: X86_CR4_PSE and X86_CR4_PAE
976	* @param pHCPtr Where to store the HC pointer.
977	*
978	* @remark This function is used by the REM at a time where PGM could
979	* potentially not be in sync. It could also be used by a
980	* future DBGF API to cpu state independent conversions.
981	*/
982	PGMDECL(int) PGMPhysGCPtr2HCPtrByGstCR3(PVM pVM, RTGCPTR GCPtr, uint64_t cr3, unsigned fFlags, PRTHCPTR pHCPtr)
983	{
984	#ifdef VBOX_WITH_NEW_PHYS_CODE
985	VM_ASSERT_EMT(pVM); /* no longer safe for use outside the EMT thread! */
986	#endif
987	/*
988	* PAE or 32-bit?
989	*/
990	Assert(!CPUMIsGuestInLongMode(pVM));
991
992	int rc;
993	if (!(fFlags & X86_CR4_PAE))
994	{
995	PX86PD pPD;
996	rc = PGM_GCPHYS_2_PTR(pVM, cr3 & X86_CR3_PAGE_MASK, &pPD);
997	if (VBOX_SUCCESS(rc))
998	{
999	X86PDE Pde = pPD->a[(RTGCUINTPTR)GCPtr >> X86_PD_SHIFT];
1000	if (Pde.n.u1Present)
1001	{
1002	if ((fFlags & X86_CR4_PSE) && Pde.b.u1Size)
1003	{ /* (big page) */
1004	rc = PGMPhysGCPhys2HCPtr(pVM, (Pde.u & X86_PDE4M_PG_MASK) \| ((RTGCUINTPTR)GCPtr & X86_PAGE_4M_OFFSET_MASK), 1 /* we always stay within one page */, pHCPtr);
1005	}
1006	else
1007	{ /* (normal page) */
1008	PX86PT pPT;
1009	rc = PGM_GCPHYS_2_PTR(pVM, Pde.u & X86_PDE_PG_MASK, &pPT);
1010	if (VBOX_SUCCESS(rc))
1011	{
1012	X86PTE Pte = pPT->a[((RTGCUINTPTR)GCPtr >> X86_PT_SHIFT) & X86_PT_MASK];
1013	if (Pte.n.u1Present)
1014	return PGMPhysGCPhys2HCPtr(pVM, (Pte.u & X86_PTE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), 1 /* we always stay within one page */, pHCPtr);
1015	rc = VERR_PAGE_NOT_PRESENT;
1016	}
1017	}
1018	}
1019	else
1020	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1021	}
1022	}
1023	else
1024	{
1025	/** @todo long mode! */
1026	Assert(PGMGetGuestMode(pVM) < PGMMODE_AMD64);
1027
1028	PX86PDPT pPdpt;
1029	rc = PGM_GCPHYS_2_PTR(pVM, cr3 & X86_CR3_PAE_PAGE_MASK, &pPdpt);
1030	if (VBOX_SUCCESS(rc))
1031	{
1032	X86PDPE Pdpe = pPdpt->a[((RTGCUINTPTR)GCPtr >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE];
1033	if (Pdpe.n.u1Present)
1034	{
1035	PX86PDPAE pPD;
1036	rc = PGM_GCPHYS_2_PTR(pVM, Pdpe.u & X86_PDPE_PG_MASK, &pPD);
1037	if (VBOX_SUCCESS(rc))
1038	{
1039	X86PDEPAE Pde = pPD->a[((RTGCUINTPTR)GCPtr >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK];
1040	if (Pde.n.u1Present)
1041	{
1042	if ((fFlags & X86_CR4_PSE) && Pde.b.u1Size)
1043	{ /* (big page) */
1044	rc = PGMPhysGCPhys2HCPtr(pVM, (Pde.u & X86_PDE2M_PAE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & X86_PAGE_2M_OFFSET_MASK), 1 /* we always stay within one page */, pHCPtr);
1045	}
1046	else
1047	{ /* (normal page) */
1048	PX86PTPAE pPT;
1049	rc = PGM_GCPHYS_2_PTR(pVM, (Pde.u & X86_PDE_PAE_PG_MASK), &pPT);
1050	if (VBOX_SUCCESS(rc))
1051	{
1052	X86PTEPAE Pte = pPT->a[((RTGCUINTPTR)GCPtr >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK];
1053	if (Pte.n.u1Present)
1054	return PGMPhysGCPhys2HCPtr(pVM, (Pte.u & X86_PTE_PAE_PG_MASK) \| ((RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK), 1 /* we always stay within one page */, pHCPtr);
1055	rc = VERR_PAGE_NOT_PRESENT;
1056	}
1057	}
1058	}
1059	else
1060	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1061	}
1062	}
1063	else
1064	rc = VERR_PAGE_TABLE_NOT_PRESENT;
1065	}
1066	}
1067	return rc;
1068	}
1069
1070
1071	#undef LOG_GROUP
1072	#define LOG_GROUP LOG_GROUP_PGM_PHYS_ACCESS
1073
1074
1075	#ifdef IN_RING3
1076	/**
1077	* Cache PGMPhys memory access
1078	*
1079	* @param pVM VM Handle.
1080	* @param pCache Cache structure pointer
1081	* @param GCPhys GC physical address
1082	* @param pbHC HC pointer corresponding to physical page
1083	*
1084	* @thread EMT.
1085	*/
1086	static void pgmPhysCacheAdd(PVM pVM, PGMPHYSCACHE pCache, RTGCPHYS GCPhys, uint8_t pbHC)
1087	{
1088	uint32_t iCacheIndex;
1089
1090	Assert(VM_IS_EMT(pVM));
1091
1092	GCPhys = PHYS_PAGE_ADDRESS(GCPhys);
1093	pbHC = (uint8_t *)PAGE_ADDRESS(pbHC);
1094
1095	iCacheIndex = ((GCPhys >> PAGE_SHIFT) & PGM_MAX_PHYSCACHE_ENTRIES_MASK);
1096
1097	ASMBitSet(&pCache->aEntries, iCacheIndex);
1098
1099	pCache->Entry[iCacheIndex].GCPhys = GCPhys;
1100	pCache->Entry[iCacheIndex].pbHC = pbHC;
1101	}
1102	#endif
1103
1104	/**
1105	* Read physical memory.
1106	*
1107	* This API respects access handlers and MMIO. Use PGMPhysReadGCPhys() if you
1108	* want to ignore those.
1109	*
1110	* @param pVM VM Handle.
1111	* @param GCPhys Physical address start reading from.
1112	* @param pvBuf Where to put the read bits.
1113	* @param cbRead How many bytes to read.
1114	*/
1115	PGMDECL(void) PGMPhysRead(PVM pVM, RTGCPHYS GCPhys, void *pvBuf, size_t cbRead)
1116	{
1117	#ifdef IN_RING3
1118	bool fGrabbedLock = false;
1119	#endif
1120
1121	AssertMsg(cbRead > 0, ("don't even think about reading zero bytes!\n"));
1122	if (cbRead == 0)
1123	return;
1124
1125	LogFlow(("PGMPhysRead: %VGp %d\n", GCPhys, cbRead));
1126
1127	#ifdef IN_RING3
1128	if (!VM_IS_EMT(pVM))
1129	{
1130	pgmLock(pVM);
1131	fGrabbedLock = true;
1132	}
1133	#endif
1134
1135	/*
1136	* Copy loop on ram ranges.
1137	*/
1138	PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
1139	for (;;)
1140	{
1141	/* Find range. */
1142	while (pRam && GCPhys > pRam->GCPhysLast)
1143	pRam = CTXALLSUFF(pRam->pNext);
1144	/* Inside range or not? */
1145	if (pRam && GCPhys >= pRam->GCPhys)
1146	{
1147	/*
1148	* Must work our way thru this page by page.
1149	*/
1150	RTGCPHYS off = GCPhys - pRam->GCPhys;
1151	while (off < pRam->cb)
1152	{
1153	unsigned iPage = off >> PAGE_SHIFT;
1154	PPGMPAGE pPage = &pRam->aPages[iPage];
1155	size_t cb;
1156
1157	/* Physical chunk in dynamically allocated range not present? */
1158	if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage)))
1159	{
1160	/* Treat it as reserved; return zeros */
1161	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1162	if (cb >= cbRead)
1163	{
1164	memset(pvBuf, 0, cbRead);
1165	goto end;
1166	}
1167	memset(pvBuf, 0, cb);
1168	}
1169	/* temp hacks, will be reorganized. */
1170	/*
1171	* Physical handler.
1172	*/
1173	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_PHYS_STATE(pPage) >= PGM_PAGE_HNDL_PHYS_STATE_ALL)
1174	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1175	{
1176	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1177	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1178
1179	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1180	/* find and call the handler */
1181	PPGMPHYSHANDLER pNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesHC->PhysHandlers, GCPhys);
1182	if (pNode && pNode->pfnHandlerR3)
1183	{
1184	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1185	if (cbRange < cb)
1186	cb = cbRange;
1187	if (cb > cbRead)
1188	cb = cbRead;
1189
1190	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1191
1192	/** @note Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1193	rc = pNode->pfnHandlerR3(pVM, GCPhys, pvSrc, pvBuf, cb, PGMACCESSTYPE_READ, pNode->pvUserR3);
1194	}
1195	#endif /* IN_RING3 */
1196	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1197	{
1198	#ifdef IN_GC
1199	void *pvSrc = NULL;
1200	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvSrc);
1201	pvSrc = (char *)pvSrc + (off & PAGE_OFFSET_MASK);
1202	#else
1203	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1204	#endif
1205
1206	if (cb >= cbRead)
1207	{
1208	memcpy(pvBuf, pvSrc, cbRead);
1209	goto end;
1210	}
1211	memcpy(pvBuf, pvSrc, cb);
1212	}
1213	else if (cb >= cbRead)
1214	goto end;
1215	}
1216	/*
1217	* Virtual handlers.
1218	*/
1219	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_VIRT_STATE(pPage) >= PGM_PAGE_HNDL_VIRT_STATE_ALL)
1220	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1221	{
1222	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1223	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1224	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1225	/* Search the whole tree for matching physical addresses (rather expensive!) */
1226	PPGMVIRTHANDLER pNode;
1227	unsigned iPage;
1228	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pNode, &iPage);
1229	if (VBOX_SUCCESS(rc2) && pNode->pfnHandlerHC)
1230	{
1231	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1232	if (cbRange < cb)
1233	cb = cbRange;
1234	if (cb > cbRead)
1235	cb = cbRead;
1236	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pNode->GCPtr & PAGE_BASE_GC_MASK)
1237	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1238
1239	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1240
1241	/** @note Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1242	rc = pNode->pfnHandlerHC(pVM, (RTGCPTR)GCPtr, pvSrc, pvBuf, cb, PGMACCESSTYPE_READ, 0);
1243	}
1244	#endif /* IN_RING3 */
1245	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1246	{
1247	#ifdef IN_GC
1248	void *pvSrc = NULL;
1249	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvSrc);
1250	pvSrc = (char *)pvSrc + (off & PAGE_OFFSET_MASK);
1251	#else
1252	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1253	#endif
1254	if (cb >= cbRead)
1255	{
1256	memcpy(pvBuf, pvSrc, cbRead);
1257	goto end;
1258	}
1259	memcpy(pvBuf, pvSrc, cb);
1260	}
1261	else if (cb >= cbRead)
1262	goto end;
1263	}
1264	else
1265	{
1266	switch (pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM)) /** @todo PAGE FLAGS */
1267	{
1268	/*
1269	* Normal memory or ROM.
1270	*/
1271	case 0:
1272	case MM_RAM_FLAGS_ROM:
1273	case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_RESERVED:
1274	//case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO2: /* = shadow */ - //MMIO2 isn't in the mask.
1275	case MM_RAM_FLAGS_MMIO2: // MMIO2 isn't in the mask.
1276	{
1277	#ifdef IN_GC
1278	void *pvSrc = NULL;
1279	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvSrc);
1280	pvSrc = (char *)pvSrc + (off & PAGE_OFFSET_MASK);
1281	#else
1282	void *pvSrc = PGMRAMRANGE_GETHCPTR(pRam, off)
1283	#endif
1284	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1285	if (cb >= cbRead)
1286	{
1287	#if defined(IN_RING3) && defined(PGM_PHYSMEMACCESS_CACHING)
1288	if (cbRead <= 4 && !fGrabbedLock /* i.e. EMT */)
1289	pgmPhysCacheAdd(pVM, &pVM->pgm.s.pgmphysreadcache, GCPhys, (uint8_t*)pvSrc);
1290	#endif /* IN_RING3 && PGM_PHYSMEMACCESS_CACHING */
1291	memcpy(pvBuf, pvSrc, cbRead);
1292	goto end;
1293	}
1294	memcpy(pvBuf, pvSrc, cb);
1295	break;
1296	}
1297
1298	/*
1299	* All reserved, nothing there.
1300	*/
1301	case MM_RAM_FLAGS_RESERVED:
1302	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1303	if (cb >= cbRead)
1304	{
1305	memset(pvBuf, 0, cbRead);
1306	goto end;
1307	}
1308	memset(pvBuf, 0, cb);
1309	break;
1310
1311	/*
1312	* The rest needs to be taken more carefully.
1313	*/
1314	default:
1315	#if 1 /** @todo r=bird: Can you do this properly please. */
1316	/** @todo Try MMIO; quick hack */
1317	if (cbRead <= 8 && IOMMMIORead(pVM, GCPhys, (uint32_t *)pvBuf, cbRead) == VINF_SUCCESS)
1318	goto end;
1319	#endif
1320
1321	/** @todo fix me later. */
1322	AssertReleaseMsgFailed(("Unknown read at %VGp size %d implement the complex physical reading case %x\n",
1323	GCPhys, cbRead,
1324	pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_ROM))); /** @todo PAGE FLAGS */
1325	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1326	break;
1327	}
1328	}
1329	cbRead -= cb;
1330	off += cb;
1331	pvBuf = (char *)pvBuf + cb;
1332	}
1333
1334	GCPhys = pRam->GCPhysLast + 1;
1335	}
1336	else
1337	{
1338	LogFlow(("PGMPhysRead: Unassigned %VGp size=%d\n", GCPhys, cbRead));
1339
1340	/*
1341	* Unassigned address space.
1342	*/
1343	size_t cb;
1344	if ( !pRam
1345	\|\| (cb = pRam->GCPhys - GCPhys) >= cbRead)
1346	{
1347	memset(pvBuf, 0, cbRead);
1348	goto end;
1349	}
1350
1351	memset(pvBuf, 0, cb);
1352	cbRead -= cb;
1353	pvBuf = (char *)pvBuf + cb;
1354	GCPhys += cb;
1355	}
1356	}
1357	end:
1358	#ifdef IN_RING3
1359	if (fGrabbedLock)
1360	pgmUnlock(pVM);
1361	#endif
1362	return;
1363	}
1364
1365	/**
1366	* Write to physical memory.
1367	*
1368	* This API respects access handlers and MMIO. Use PGMPhysReadGCPhys() if you
1369	* want to ignore those.
1370	*
1371	* @param pVM VM Handle.
1372	* @param GCPhys Physical address to write to.
1373	* @param pvBuf What to write.
1374	* @param cbWrite How many bytes to write.
1375	*/
1376	PGMDECL(void) PGMPhysWrite(PVM pVM, RTGCPHYS GCPhys, const void *pvBuf, size_t cbWrite)
1377	{
1378	#ifdef IN_RING3
1379	bool fGrabbedLock = false;
1380	#endif
1381
1382	AssertMsg(!pVM->pgm.s.fNoMorePhysWrites, ("Calling PGMPhysWrite after pgmR3Save()!\n"));
1383	AssertMsg(cbWrite > 0, ("don't even think about writing zero bytes!\n"));
1384	if (cbWrite == 0)
1385	return;
1386
1387	LogFlow(("PGMPhysWrite: %VGp %d\n", GCPhys, cbWrite));
1388
1389	#ifdef IN_RING3
1390	if (!VM_IS_EMT(pVM))
1391	{
1392	pgmLock(pVM);
1393	fGrabbedLock = true;
1394	}
1395	#endif
1396	/*
1397	* Copy loop on ram ranges.
1398	*/
1399	PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
1400	for (;;)
1401	{
1402	/* Find range. */
1403	while (pRam && GCPhys > pRam->GCPhysLast)
1404	pRam = CTXALLSUFF(pRam->pNext);
1405	/* Inside range or not? */
1406	if (pRam && GCPhys >= pRam->GCPhys)
1407	{
1408	/*
1409	* Must work our way thru this page by page.
1410	*/
1411	unsigned off = GCPhys - pRam->GCPhys;
1412	while (off < pRam->cb)
1413	{
1414	unsigned iPage = off >> PAGE_SHIFT;
1415	PPGMPAGE pPage = &pRam->aPages[iPage];
1416
1417	/* Physical chunk in dynamically allocated range not present? */
1418	if (RT_UNLIKELY(!PGM_PAGE_GET_HCPHYS(pPage)))
1419	{
1420	int rc;
1421	#ifdef IN_RING3
1422	if (fGrabbedLock)
1423	{
1424	pgmUnlock(pVM);
1425	rc = pgmr3PhysGrowRange(pVM, GCPhys);
1426	if (rc == VINF_SUCCESS)
1427	PGMPhysWrite(pVM, GCPhys, pvBuf, cbWrite); /* try again; can't assume pRam is still valid (paranoia) */
1428	return;
1429	}
1430	rc = pgmr3PhysGrowRange(pVM, GCPhys);
1431	#else
1432	rc = CTXALLMID(VMM, CallHost)(pVM, VMMCALLHOST_PGM_RAM_GROW_RANGE, GCPhys);
1433	#endif
1434	if (rc != VINF_SUCCESS)
1435	goto end;
1436	}
1437
1438	size_t cb;
1439	/* temporary hack, will reogranize is later. */
1440	/*
1441	* Virtual handlers
1442	*/
1443	if ( PGM_PAGE_HAS_ACTIVE_VIRTUAL_HANDLERS(pPage)
1444	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1445	{
1446	if (PGM_PAGE_HAS_ACTIVE_PHYSICAL_HANDLERS(pPage))
1447	{
1448	/*
1449	* Physical write handler + virtual write handler.
1450	* Consider this a quick workaround for the CSAM + shadow caching problem.
1451	*
1452	* We hand it to the shadow caching first since it requires the unchanged
1453	* data. CSAM will have to put up with it already being changed.
1454	*/
1455	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1456	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1457	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1458	/* 1. The physical handler */
1459	PPGMPHYSHANDLER pPhysNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesHC->PhysHandlers, GCPhys);
1460	if (pPhysNode && pPhysNode->pfnHandlerR3)
1461	{
1462	size_t cbRange = pPhysNode->Core.KeyLast - GCPhys + 1;
1463	if (cbRange < cb)
1464	cb = cbRange;
1465	if (cb > cbWrite)
1466	cb = cbWrite;
1467
1468	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1469
1470	/** @note Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1471	rc = pPhysNode->pfnHandlerR3(pVM, GCPhys, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, pPhysNode->pvUserR3);
1472	}
1473
1474	/* 2. The virtual handler (will see incorrect data) */
1475	PPGMVIRTHANDLER pVirtNode;
1476	unsigned iPage;
1477	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pVirtNode, &iPage);
1478	if (VBOX_SUCCESS(rc2) && pVirtNode->pfnHandlerHC)
1479	{
1480	size_t cbRange = pVirtNode->Core.KeyLast - GCPhys + 1;
1481	if (cbRange < cb)
1482	cb = cbRange;
1483	if (cb > cbWrite)
1484	cb = cbWrite;
1485	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pVirtNode->GCPtr & PAGE_BASE_GC_MASK)
1486	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1487
1488	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1489
1490	/** @note Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1491	rc2 = pVirtNode->pfnHandlerHC(pVM, (RTGCPTR)GCPtr, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, 0);
1492	if ( ( rc2 != VINF_PGM_HANDLER_DO_DEFAULT
1493	&& rc == VINF_PGM_HANDLER_DO_DEFAULT)
1494	\|\| ( VBOX_FAILURE(rc2)
1495	&& VBOX_SUCCESS(rc)))
1496	rc = rc2;
1497	}
1498	#endif /* IN_RING3 */
1499	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1500	{
1501	#ifdef IN_GC
1502	void *pvDst = NULL;
1503	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvDst);
1504	pvDst = (char *)pvDst + (off & PAGE_OFFSET_MASK);
1505	#else
1506	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1507	#endif
1508	if (cb >= cbWrite)
1509	{
1510	memcpy(pvDst, pvBuf, cbWrite);
1511	goto end;
1512	}
1513	memcpy(pvDst, pvBuf, cb);
1514	}
1515	else if (cb >= cbWrite)
1516	goto end;
1517	}
1518	else
1519	{
1520	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1521	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1522	#ifdef IN_RING3
1523	/** @todo deal with this in GC and R0! */
1524	/* Search the whole tree for matching physical addresses (rather expensive!) */
1525	PPGMVIRTHANDLER pNode;
1526	unsigned iPage;
1527	int rc2 = pgmHandlerVirtualFindByPhysAddr(pVM, GCPhys, &pNode, &iPage);
1528	if (VBOX_SUCCESS(rc2) && pNode->pfnHandlerHC)
1529	{
1530	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1531	if (cbRange < cb)
1532	cb = cbRange;
1533	if (cb > cbWrite)
1534	cb = cbWrite;
1535	RTGCUINTPTR GCPtr = ((RTGCUINTPTR)pNode->GCPtr & PAGE_BASE_GC_MASK)
1536	+ (iPage << PAGE_SHIFT) + (off & PAGE_OFFSET_MASK);
1537
1538	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1539
1540	/** @tode Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1541	rc = pNode->pfnHandlerHC(pVM, (RTGCPTR)GCPtr, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, 0);
1542	}
1543	#endif /* IN_RING3 */
1544	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1545	{
1546	#ifdef IN_GC
1547	void *pvDst = NULL;
1548	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvDst);
1549	pvDst = (char *)pvDst + (off & PAGE_OFFSET_MASK);
1550	#else
1551	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1552	#endif
1553	if (cb >= cbWrite)
1554	{
1555	memcpy(pvDst, pvBuf, cbWrite);
1556	goto end;
1557	}
1558	memcpy(pvDst, pvBuf, cb);
1559	}
1560	else if (cb >= cbWrite)
1561	goto end;
1562	}
1563	}
1564	/*
1565	* Physical handler.
1566	*/
1567	else if ( RT_UNLIKELY(PGM_PAGE_GET_HNDL_PHYS_STATE(pPage) >= PGM_PAGE_HNDL_PHYS_STATE_WRITE)
1568	&& !(pPage->HCPhys & MM_RAM_FLAGS_MMIO)) /// @todo PAGE FLAGS
1569	{
1570	int rc = VINF_PGM_HANDLER_DO_DEFAULT;
1571	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1572	#ifdef IN_RING3 /** @todo deal with this in GC and R0! */
1573	/* find and call the handler */
1574	PPGMPHYSHANDLER pNode = (PPGMPHYSHANDLER)RTAvlroGCPhysRangeGet(&pVM->pgm.s.pTreesHC->PhysHandlers, GCPhys);
1575	if (pNode && pNode->pfnHandlerR3)
1576	{
1577	size_t cbRange = pNode->Core.KeyLast - GCPhys + 1;
1578	if (cbRange < cb)
1579	cb = cbRange;
1580	if (cb > cbWrite)
1581	cb = cbWrite;
1582
1583	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1584
1585	/** @todo Dangerous assumption that HC handlers don't do anything that really requires an EMT lock! */
1586	rc = pNode->pfnHandlerR3(pVM, GCPhys, pvDst, (void *)pvBuf, cb, PGMACCESSTYPE_WRITE, pNode->pvUserR3);
1587	}
1588	#endif /* IN_RING3 */
1589	if (rc == VINF_PGM_HANDLER_DO_DEFAULT)
1590	{
1591	#ifdef IN_GC
1592	void *pvDst = NULL;
1593	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvDst);
1594	pvDst = (char *)pvDst + (off & PAGE_OFFSET_MASK);
1595	#else
1596	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1597	#endif
1598	if (cb >= cbWrite)
1599	{
1600	memcpy(pvDst, pvBuf, cbWrite);
1601	goto end;
1602	}
1603	memcpy(pvDst, pvBuf, cb);
1604	}
1605	else if (cb >= cbWrite)
1606	goto end;
1607	}
1608	else
1609	{
1610	/** @todo r=bird: missing MM_RAM_FLAGS_ROM here, we shall not allow anyone to overwrite the ROM! */
1611	switch (pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2)) /** @todo PAGE FLAGS */
1612	{
1613	/*
1614	* Normal memory, MMIO2 or writable shadow ROM.
1615	*/
1616	case 0:
1617	case MM_RAM_FLAGS_MMIO2:
1618	case MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO2: /* shadow rom */
1619	{
1620	#ifdef IN_GC
1621	void *pvDst = NULL;
1622	PGMGCDynMapHCPage(pVM, PGM_PAGE_GET_HCPHYS(pPage), &pvDst);
1623	pvDst = (char *)pvDst + (off & PAGE_OFFSET_MASK);
1624	#else
1625	void *pvDst = PGMRAMRANGE_GETHCPTR(pRam, off)
1626	#endif
1627	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1628	if (cb >= cbWrite)
1629	{
1630	#if defined(IN_RING3) && defined(PGM_PHYSMEMACCESS_CACHING)
1631	if (cbWrite <= 4 && !fGrabbedLock /* i.e. EMT */)
1632	pgmPhysCacheAdd(pVM, &pVM->pgm.s.pgmphyswritecache, GCPhys, (uint8_t*)pvDst);
1633	#endif /* IN_RING3 && PGM_PHYSMEMACCESS_CACHING */
1634	memcpy(pvDst, pvBuf, cbWrite);
1635	goto end;
1636	}
1637	memcpy(pvDst, pvBuf, cb);
1638	break;
1639	}
1640
1641	/*
1642	* All reserved, nothing there.
1643	*/
1644	case MM_RAM_FLAGS_RESERVED:
1645	case MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO2:
1646	cb = PAGE_SIZE - (off & PAGE_OFFSET_MASK);
1647	if (cb >= cbWrite)
1648	goto end;
1649	break;
1650
1651
1652	/*
1653	* The rest needs to be taken more carefully.
1654	*/
1655	default:
1656	#if 1 /** @todo r=bird: Can you do this properly please. */
1657	/** @todo Try MMIO; quick hack */
1658	if (cbWrite <= 8 && IOMMMIOWrite(pVM, GCPhys, (uint32_t )pvBuf, cbWrite) == VINF_SUCCESS)
1659	goto end;
1660	#endif
1661
1662	/** @todo fix me later. */
1663	AssertReleaseMsgFailed(("Unknown write at %VGp size %d implement the complex physical writing case %x\n",
1664	GCPhys, cbWrite,
1665	(pPage->HCPhys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2)))); /** @todo PAGE FLAGS */
1666	/* skip the write */
1667	cb = cbWrite;
1668	break;
1669	}
1670	}
1671
1672	cbWrite -= cb;
1673	off += cb;
1674	pvBuf = (const char *)pvBuf + cb;
1675	}
1676
1677	GCPhys = pRam->GCPhysLast + 1;
1678	}
1679	else
1680	{
1681	/*
1682	* Unassigned address space.
1683	*/
1684	size_t cb;
1685	if ( !pRam
1686	\|\| (cb = pRam->GCPhys - GCPhys) >= cbWrite)
1687	goto end;
1688
1689	cbWrite -= cb;
1690	pvBuf = (const char *)pvBuf + cb;
1691	GCPhys += cb;
1692	}
1693	}
1694	end:
1695	#ifdef IN_RING3
1696	if (fGrabbedLock)
1697	pgmUnlock(pVM);
1698	#endif
1699	return;
1700	}
1701
1702	#ifndef IN_GC /* Ring 0 & 3 only */
1703
1704	/**
1705	* Read from guest physical memory by GC physical address, bypassing
1706	* MMIO and access handlers.
1707	*
1708	* @returns VBox status.
1709	* @param pVM VM handle.
1710	* @param pvDst The destination address.
1711	* @param GCPhysSrc The source address (GC physical address).
1712	* @param cb The number of bytes to read.
1713	*/
1714	PGMDECL(int) PGMPhysReadGCPhys(PVM pVM, void *pvDst, RTGCPHYS GCPhysSrc, size_t cb)
1715	{
1716	/*
1717	* Anything to be done?
1718	*/
1719	if (!cb)
1720	return VINF_SUCCESS;
1721
1722	/*
1723	* Loop ram ranges.
1724	*/
1725	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
1726	pRam;
1727	pRam = CTXALLSUFF(pRam->pNext))
1728	{
1729	RTGCPHYS off = GCPhysSrc - pRam->GCPhys;
1730	if (off < pRam->cb)
1731	{
1732	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
1733	{
1734	/* Copy page by page as we're not dealing with a linear HC range. */
1735	for (;;)
1736	{
1737	/* convert */
1738	void *pvSrc;
1739	int rc = pgmRamGCPhys2HCPtrWithRange(pVM, pRam, GCPhysSrc, &pvSrc);
1740	if (VBOX_FAILURE(rc))
1741	return rc;
1742
1743	/* copy */
1744	size_t cbRead = PAGE_SIZE - ((RTGCUINTPTR)GCPhysSrc & PAGE_OFFSET_MASK);
1745	if (cbRead >= cb)
1746	{
1747	memcpy(pvDst, pvSrc, cb);
1748	return VINF_SUCCESS;
1749	}
1750	memcpy(pvDst, pvSrc, cbRead);
1751
1752	/* next */
1753	cb -= cbRead;
1754	pvDst = (uint8_t *)pvDst + cbRead;
1755	GCPhysSrc += cbRead;
1756	}
1757	}
1758	else if (pRam->pvHC)
1759	{
1760	/* read */
1761	size_t cbRead = pRam->cb - off;
1762	if (cbRead >= cb)
1763	{
1764	memcpy(pvDst, (uint8_t *)pRam->pvHC + off, cb);
1765	return VINF_SUCCESS;
1766	}
1767	memcpy(pvDst, (uint8_t *)pRam->pvHC + off, cbRead);
1768
1769	/* next */
1770	cb -= cbRead;
1771	pvDst = (uint8_t *)pvDst + cbRead;
1772	GCPhysSrc += cbRead;
1773	}
1774	else
1775	return VERR_PGM_PHYS_PAGE_RESERVED;
1776	}
1777	else if (GCPhysSrc < pRam->GCPhysLast)
1778	break;
1779	}
1780	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
1781	}
1782
1783
1784	/**
1785	* Write to guest physical memory referenced by GC pointer.
1786	* Write memory to GC physical address in guest physical memory.
1787	*
1788	* This will bypass MMIO and access handlers.
1789	*
1790	* @returns VBox status.
1791	* @param pVM VM handle.
1792	* @param GCPhysDst The GC physical address of the destination.
1793	* @param pvSrc The source buffer.
1794	* @param cb The number of bytes to write.
1795	*/
1796	PGMDECL(int) PGMPhysWriteGCPhys(PVM pVM, RTGCPHYS GCPhysDst, const void *pvSrc, size_t cb)
1797	{
1798	/*
1799	* Anything to be done?
1800	*/
1801	if (!cb)
1802	return VINF_SUCCESS;
1803
1804	LogFlow(("PGMPhysWriteGCPhys: %VGp %d\n", GCPhysDst, cb));
1805
1806	/*
1807	* Loop ram ranges.
1808	*/
1809	for (PPGMRAMRANGE pRam = CTXALLSUFF(pVM->pgm.s.pRamRanges);
1810	pRam;
1811	pRam = CTXALLSUFF(pRam->pNext))
1812	{
1813	RTGCPHYS off = GCPhysDst - pRam->GCPhys;
1814	if (off < pRam->cb)
1815	{
1816	#ifdef VBOX_WITH_NEW_PHYS_CODE
1817	/** @todo PGMRamGCPhys2HCPtrWithRange. */
1818	#endif
1819	if (pRam->fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
1820	{
1821	/* Copy page by page as we're not dealing with a linear HC range. */
1822	for (;;)
1823	{
1824	/* convert */
1825	void *pvDst;
1826	int rc = pgmRamGCPhys2HCPtrWithRange(pVM, pRam, GCPhysDst, &pvDst);
1827	if (VBOX_FAILURE(rc))
1828	return rc;
1829
1830	/* copy */
1831	size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPhysDst & PAGE_OFFSET_MASK);
1832	if (cbWrite >= cb)
1833	{
1834	memcpy(pvDst, pvSrc, cb);
1835	return VINF_SUCCESS;
1836	}
1837	memcpy(pvDst, pvSrc, cbWrite);
1838
1839	/* next */
1840	cb -= cbWrite;
1841	pvSrc = (uint8_t *)pvSrc + cbWrite;
1842	GCPhysDst += cbWrite;
1843	}
1844	}
1845	else if (pRam->pvHC)
1846	{
1847	/* write */
1848	size_t cbWrite = pRam->cb - off;
1849	if (cbWrite >= cb)
1850	{
1851	memcpy((uint8_t *)pRam->pvHC + off, pvSrc, cb);
1852	return VINF_SUCCESS;
1853	}
1854	memcpy((uint8_t *)pRam->pvHC + off, pvSrc, cbWrite);
1855
1856	/* next */
1857	cb -= cbWrite;
1858	GCPhysDst += cbWrite;
1859	pvSrc = (uint8_t *)pvSrc + cbWrite;
1860	}
1861	else
1862	return VERR_PGM_PHYS_PAGE_RESERVED;
1863	}
1864	else if (GCPhysDst < pRam->GCPhysLast)
1865	break;
1866	}
1867	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
1868	}
1869
1870
1871	/**
1872	* Read from guest physical memory referenced by GC pointer.
1873	*
1874	* This function uses the current CR3/CR0/CR4 of the guest and will
1875	* bypass access handlers and not set any accessed bits.
1876	*
1877	* @returns VBox status.
1878	* @param pVM VM handle.
1879	* @param pvDst The destination address.
1880	* @param GCPtrSrc The source address (GC pointer).
1881	* @param cb The number of bytes to read.
1882	*/
1883	PGMDECL(int) PGMPhysReadGCPtr(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
1884	{
1885	/*
1886	* Anything to do?
1887	*/
1888	if (!cb)
1889	return VINF_SUCCESS;
1890
1891	/*
1892	* Optimize reads within a single page.
1893	*/
1894	if (((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
1895	{
1896	void *pvSrc;
1897	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrSrc, &pvSrc);
1898	if (VBOX_FAILURE(rc))
1899	return rc;
1900	memcpy(pvDst, pvSrc, cb);
1901	return VINF_SUCCESS;
1902	}
1903
1904	/*
1905	* Page by page.
1906	*/
1907	for (;;)
1908	{
1909	/* convert */
1910	void *pvSrc;
1911	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrSrc, &pvSrc);
1912	if (VBOX_FAILURE(rc))
1913	return rc;
1914
1915	/* copy */
1916	size_t cbRead = PAGE_SIZE - ((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK);
1917	if (cbRead >= cb)
1918	{
1919	memcpy(pvDst, pvSrc, cb);
1920	return VINF_SUCCESS;
1921	}
1922	memcpy(pvDst, pvSrc, cbRead);
1923
1924	/* next */
1925	cb -= cbRead;
1926	pvDst = (uint8_t *)pvDst + cbRead;
1927	GCPtrSrc += cbRead;
1928	}
1929	}
1930
1931
1932	/**
1933	* Write to guest physical memory referenced by GC pointer.
1934	*
1935	* This function uses the current CR3/CR0/CR4 of the guest and will
1936	* bypass access handlers and not set dirty or accessed bits.
1937	*
1938	* @returns VBox status.
1939	* @param pVM VM handle.
1940	* @param GCPtrDst The destination address (GC pointer).
1941	* @param pvSrc The source address.
1942	* @param cb The number of bytes to write.
1943	*/
1944	PGMDECL(int) PGMPhysWriteGCPtr(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
1945	{
1946	/*
1947	* Anything to do?
1948	*/
1949	if (!cb)
1950	return VINF_SUCCESS;
1951
1952	LogFlow(("PGMPhysWriteGCPtr: %VGv %d\n", GCPtrDst, cb));
1953
1954	/*
1955	* Optimize writes within a single page.
1956	*/
1957	if (((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
1958	{
1959	void *pvDst;
1960	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrDst, &pvDst);
1961	if (VBOX_FAILURE(rc))
1962	return rc;
1963	memcpy(pvDst, pvSrc, cb);
1964	return VINF_SUCCESS;
1965	}
1966
1967	/*
1968	* Page by page.
1969	*/
1970	for (;;)
1971	{
1972	/* convert */
1973	void *pvDst;
1974	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrDst, &pvDst);
1975	if (VBOX_FAILURE(rc))
1976	return rc;
1977
1978	/* copy */
1979	size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
1980	if (cbWrite >= cb)
1981	{
1982	memcpy(pvDst, pvSrc, cb);
1983	return VINF_SUCCESS;
1984	}
1985	memcpy(pvDst, pvSrc, cbWrite);
1986
1987	/* next */
1988	cb -= cbWrite;
1989	pvSrc = (uint8_t *)pvSrc + cbWrite;
1990	GCPtrDst += cbWrite;
1991	}
1992	}
1993
1994	/**
1995	* Read from guest physical memory referenced by GC pointer.
1996	*
1997	* This function uses the current CR3/CR0/CR4 of the guest and will
1998	* respect access handlers and set accessed bits.
1999	*
2000	* @returns VBox status.
2001	* @param pVM VM handle.
2002	* @param pvDst The destination address.
2003	* @param GCPtrSrc The source address (GC pointer).
2004	* @param cb The number of bytes to read.
2005	*/
2006	/** @todo use the PGMPhysReadGCPtr name and rename the unsafe one to something appropriate */
2007	PGMDECL(int) PGMPhysReadGCPtrSafe(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
2008	{
2009	RTGCPHYS GCPhys;
2010	int rc;
2011
2012	/*
2013	* Anything to do?
2014	*/
2015	if (!cb)
2016	return VINF_SUCCESS;
2017
2018	LogFlow(("PGMPhysReadGCPtrSafe: %VGv %d\n", GCPtrSrc, cb));
2019
2020	/*
2021	* Optimize reads within a single page.
2022	*/
2023	if (((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
2024	{
2025	/* Convert virtual to physical address */
2026	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrSrc, &GCPhys);
2027	AssertRCReturn(rc, rc);
2028
2029	/* mark the guest page as accessed. */
2030	rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
2031	AssertRC(rc);
2032
2033	PGMPhysRead(pVM, GCPhys, pvDst, cb);
2034	return VINF_SUCCESS;
2035	}
2036
2037	/*
2038	* Page by page.
2039	*/
2040	for (;;)
2041	{
2042	/* Convert virtual to physical address */
2043	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrSrc, &GCPhys);
2044	AssertRCReturn(rc, rc);
2045
2046	/* mark the guest page as accessed. */
2047	int rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
2048	AssertRC(rc);
2049
2050	/* copy */
2051	size_t cbRead = PAGE_SIZE - ((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK);
2052	if (cbRead >= cb)
2053	{
2054	PGMPhysRead(pVM, GCPhys, pvDst, cb);
2055	return VINF_SUCCESS;
2056	}
2057	PGMPhysRead(pVM, GCPhys, pvDst, cbRead);
2058
2059	/* next */
2060	cb -= cbRead;
2061	pvDst = (uint8_t *)pvDst + cbRead;
2062	GCPtrSrc += cbRead;
2063	}
2064	}
2065
2066
2067	/**
2068	* Write to guest physical memory referenced by GC pointer.
2069	*
2070	* This function uses the current CR3/CR0/CR4 of the guest and will
2071	* respect access handlers and set dirty and accessed bits.
2072	*
2073	* @returns VBox status.
2074	* @param pVM VM handle.
2075	* @param GCPtrDst The destination address (GC pointer).
2076	* @param pvSrc The source address.
2077	* @param cb The number of bytes to write.
2078	*/
2079	/** @todo use the PGMPhysWriteGCPtr name and rename the unsafe one to something appropriate */
2080	PGMDECL(int) PGMPhysWriteGCPtrSafe(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2081	{
2082	RTGCPHYS GCPhys;
2083	int rc;
2084
2085	/*
2086	* Anything to do?
2087	*/
2088	if (!cb)
2089	return VINF_SUCCESS;
2090
2091	LogFlow(("PGMPhysWriteGCPtrSafe: %VGv %d\n", GCPtrDst, cb));
2092
2093	/*
2094	* Optimize writes within a single page.
2095	*/
2096	if (((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
2097	{
2098	/* Convert virtual to physical address */
2099	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrDst, &GCPhys);
2100	AssertRCReturn(rc, rc);
2101
2102	/* mark the guest page as accessed and dirty. */
2103	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2104	AssertRC(rc);
2105
2106	PGMPhysWrite(pVM, GCPhys, pvSrc, cb);
2107	return VINF_SUCCESS;
2108	}
2109
2110	/*
2111	* Page by page.
2112	*/
2113	for (;;)
2114	{
2115	/* Convert virtual to physical address */
2116	rc = PGMPhysGCPtr2GCPhys(pVM, GCPtrDst, &GCPhys);
2117	AssertRCReturn(rc, rc);
2118
2119	/* mark the guest page as accessed and dirty. */
2120	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2121	AssertRC(rc);
2122
2123	/* copy */
2124	size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
2125	if (cbWrite >= cb)
2126	{
2127	PGMPhysWrite(pVM, GCPhys, pvSrc, cb);
2128	return VINF_SUCCESS;
2129	}
2130	PGMPhysWrite(pVM, GCPhys, pvSrc, cbWrite);
2131
2132	/* next */
2133	cb -= cbWrite;
2134	pvSrc = (uint8_t *)pvSrc + cbWrite;
2135	GCPtrDst += cbWrite;
2136	}
2137	}
2138
2139	/**
2140	* Write to guest physical memory referenced by GC pointer and update the PTE.
2141	*
2142	* This function uses the current CR3/CR0/CR4 of the guest and will
2143	* bypass access handlers and set any dirty and accessed bits in the PTE.
2144	*
2145	* If you don't want to set the dirty bit, use PGMPhysWriteGCPtr().
2146	*
2147	* @returns VBox status.
2148	* @param pVM VM handle.
2149	* @param GCPtrDst The destination address (GC pointer).
2150	* @param pvSrc The source address.
2151	* @param cb The number of bytes to write.
2152	*/
2153	PGMDECL(int) PGMPhysWriteGCPtrDirty(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2154	{
2155	/*
2156	* Anything to do?
2157	*/
2158	if (!cb)
2159	return VINF_SUCCESS;
2160
2161	/*
2162	* Optimize writes within a single page.
2163	*/
2164	if (((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
2165	{
2166	void *pvDst;
2167	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrDst, &pvDst);
2168	if (VBOX_FAILURE(rc))
2169	return rc;
2170	memcpy(pvDst, pvSrc, cb);
2171	rc = PGMGstModifyPage(pVM, GCPtrDst, cb, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2172	AssertRC(rc);
2173	return VINF_SUCCESS;
2174	}
2175
2176	/*
2177	* Page by page.
2178	*/
2179	for (;;)
2180	{
2181	/* convert */
2182	void *pvDst;
2183	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrDst, &pvDst);
2184	if (VBOX_FAILURE(rc))
2185	return rc;
2186
2187	/* mark the guest page as accessed and dirty. */
2188	rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A \| X86_PTE_D, ~(uint64_t)(X86_PTE_A \| X86_PTE_D));
2189	AssertRC(rc);
2190
2191	/* copy */
2192	size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
2193	if (cbWrite >= cb)
2194	{
2195	memcpy(pvDst, pvSrc, cb);
2196	return VINF_SUCCESS;
2197	}
2198	memcpy(pvDst, pvSrc, cbWrite);
2199
2200	/* next */
2201	cb -= cbWrite;
2202	GCPtrDst += cbWrite;
2203	pvSrc = (char *)pvSrc + cbWrite;
2204	}
2205	}
2206
2207	#endif /* !IN_GC */
2208
2209
2210
2211	/**
2212	* Performs a read of guest virtual memory for instruction emulation.
2213	*
2214	* This will check permissions, raise exceptions and update the access bits.
2215	*
2216	* The current implementation will bypass all access handlers. It may later be
2217	* changed to at least respect MMIO.
2218	*
2219	*
2220	* @returns VBox status code suitable to scheduling.
2221	* @retval VINF_SUCCESS if the read was performed successfully.
2222	* @retval VINF_EM_RAW_GUEST_TRAP if an exception was raised but not dispatched yet.
2223	* @retval VINF_TRPM_XCPT_DISPATCHED if an exception was raised and dispatched.
2224	*
2225	* @param pVM The VM handle.
2226	* @param pCtxCore The context core.
2227	* @param pvDst Where to put the bytes we've read.
2228	* @param GCPtrSrc The source address.
2229	* @param cb The number of bytes to read. Not more than a page.
2230	*
2231	* @remark This function will dynamically map physical pages in GC. This may unmap
2232	* mappings done by the caller. Be careful!
2233	*/
2234	PGMDECL(int) PGMPhysInterpretedRead(PVM pVM, PCPUMCTXCORE pCtxCore, void *pvDst, RTGCUINTPTR GCPtrSrc, size_t cb)
2235	{
2236	Assert(cb <= PAGE_SIZE);
2237
2238	/** @todo r=bird: This isn't perfect!
2239	* -# It's not checking for reserved bits being 1.
2240	* -# It's not correctly dealing with the access bit.
2241	* -# It's not respecting MMIO memory or any other access handlers.
2242	*/
2243	/*
2244	* 1. Translate virtual to physical. This may fault.
2245	* 2. Map the physical address.
2246	* 3. Do the read operation.
2247	* 4. Set access bits if required.
2248	*/
2249	int rc;
2250	unsigned cb1 = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
2251	if (cb <= cb1)
2252	{
2253	/*
2254	* Not crossing pages.
2255	*/
2256	RTGCPHYS GCPhys;
2257	uint64_t fFlags;
2258	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc, &fFlags, &GCPhys);
2259	if (VBOX_SUCCESS(rc))
2260	{
2261	/** @todo we should check reserved bits ... */
2262	void *pvSrc;
2263	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys, &pvSrc);
2264	switch (rc)
2265	{
2266	case VINF_SUCCESS:
2267	Log(("PGMPhysInterpretedRead: pvDst=%p pvSrc=%p cb=%d\n", pvDst, (uint8_t *)pvSrc + (GCPtrSrc & PAGE_OFFSET_MASK), cb));
2268	memcpy(pvDst, (uint8_t *)pvSrc + (GCPtrSrc & PAGE_OFFSET_MASK), cb);
2269	break;
2270	case VERR_PGM_PHYS_PAGE_RESERVED:
2271	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2272	memset(pvDst, 0, cb);
2273	break;
2274	default:
2275	return rc;
2276	}
2277
2278	/** @todo access bit emulation isn't 100% correct. */
2279	if (!(fFlags & X86_PTE_A))
2280	{
2281	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2282	AssertRC(rc);
2283	}
2284	return VINF_SUCCESS;
2285	}
2286	}
2287	else
2288	{
2289	/*
2290	* Crosses pages.
2291	*/
2292	unsigned cb2 = cb - cb1;
2293	uint64_t fFlags1;
2294	RTGCPHYS GCPhys1;
2295	uint64_t fFlags2;
2296	RTGCPHYS GCPhys2;
2297	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc, &fFlags1, &GCPhys1);
2298	if (VBOX_SUCCESS(rc))
2299	rc = PGM_GST_PFN(GetPage,pVM)(pVM, GCPtrSrc + cb1, &fFlags2, &GCPhys2);
2300	if (VBOX_SUCCESS(rc))
2301	{
2302	/** @todo we should check reserved bits ... */
2303	AssertMsgFailed(("cb=%d cb1=%d cb2=%d GCPtrSrc=%VGv\n", cb, cb1, cb2, GCPtrSrc));
2304	void *pvSrc1;
2305	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys1, &pvSrc1);
2306	switch (rc)
2307	{
2308	case VINF_SUCCESS:
2309	memcpy(pvDst, (uint8_t *)pvSrc1 + (GCPtrSrc & PAGE_OFFSET_MASK), cb1);
2310	break;
2311	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2312	memset(pvDst, 0, cb1);
2313	break;
2314	default:
2315	return rc;
2316	}
2317
2318	void *pvSrc2;
2319	rc = PGM_GCPHYS_2_PTR(pVM, GCPhys2, &pvSrc2);
2320	switch (rc)
2321	{
2322	case VINF_SUCCESS:
2323	memcpy((uint8_t *)pvDst + cb2, pvSrc2, cb2);
2324	break;
2325	case VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS:
2326	memset((uint8_t *)pvDst + cb2, 0, cb2);
2327	break;
2328	default:
2329	return rc;
2330	}
2331
2332	if (!(fFlags1 & X86_PTE_A))
2333	{
2334	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2335	AssertRC(rc);
2336	}
2337	if (!(fFlags2 & X86_PTE_A))
2338	{
2339	rc = PGM_GST_PFN(ModifyPage,pVM)(pVM, GCPtrSrc + cb1, 1, X86_PTE_A, ~(uint64_t)X86_PTE_A);
2340	AssertRC(rc);
2341	}
2342	return VINF_SUCCESS;
2343	}
2344	}
2345
2346	/*
2347	* Raise a #PF.
2348	*/
2349	uint32_t uErr;
2350
2351	/* Get the current privilege level. */
2352	uint32_t cpl = CPUMGetGuestCPL(pVM, pCtxCore);
2353	switch (rc)
2354	{
2355	case VINF_SUCCESS:
2356	uErr = (cpl >= 2) ? X86_TRAP_PF_RSVD \| X86_TRAP_PF_US : X86_TRAP_PF_RSVD;
2357	break;
2358
2359	case VERR_PAGE_NOT_PRESENT:
2360	case VERR_PAGE_TABLE_NOT_PRESENT:
2361	uErr = (cpl >= 2) ? X86_TRAP_PF_US : 0;
2362	break;
2363
2364	default:
2365	AssertMsgFailed(("rc=%Vrc GCPtrSrc=%VGv cb=%#x\n", rc, GCPtrSrc, cb));
2366	return rc;
2367	}
2368	Log(("PGMPhysInterpretedRead: GCPtrSrc=%VGv cb=%#x -> #PF(%#x)\n", GCPtrSrc, cb, uErr));
2369	return TRPMRaiseXcptErrCR2(pVM, pCtxCore, X86_XCPT_PF, uErr, GCPtrSrc);
2370	}
2371
2372	/// @todo PGMDECL(int) PGMPhysInterpretedWrite(PVM pVM, PCPUMCTXCORE pCtxCore, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
2373
2374

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllPhys.cpp@ 10700

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