PGMMap.cpp@ 19167

Last change on this file since 19167 was 19141, checked in by vboxsync, 16 years ago
Action flags breakup. Fixed PGM saved state loading of 2.2.2 images. Reduced hacks in PATM state loading (fixups).
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 47.7 KB

Line
1	/* $Id: PGMMap.cpp 19141 2009-04-23 13:52:18Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager, Guest Context Mappings.
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	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_PGM
27	#include <VBox/dbgf.h>
28	#include <VBox/pgm.h>
29	#include "PGMInternal.h"
30	#include <VBox/vm.h>
31
32	#include <VBox/log.h>
33	#include <VBox/err.h>
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/string.h>
37
38
39	/*******************************************************************************
40	* Internal Functions *
41	*******************************************************************************/
42	static void pgmR3MapClearPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iOldPDE);
43	static void pgmR3MapSetPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iNewPDE);
44	static int pgmR3MapIntermediateCheckOne(PVM pVM, uintptr_t uAddress, unsigned cPages, PX86PT pPTDefault, PX86PTPAE pPTPaeDefault);
45	static void pgmR3MapIntermediateDoOne(PVM pVM, uintptr_t uAddress, RTHCPHYS HCPhys, unsigned cPages, PX86PT pPTDefault, PX86PTPAE pPTPaeDefault);
46
47
48	/**
49	* Creates a page table based mapping in GC.
50	*
51	* @returns VBox status code.
52	* @param pVM VM Handle.
53	* @param GCPtr Virtual Address. (Page table aligned!)
54	* @param cb Size of the range. Must be a 4MB aligned!
55	* @param fFlags PGMR3MAPPT_FLAGS_UNMAPPABLE or 0.
56	* @param pfnRelocate Relocation callback function.
57	* @param pvUser User argument to the callback.
58	* @param pszDesc Pointer to description string. This must not be freed.
59	*/
60	VMMR3DECL(int) PGMR3MapPT(PVM pVM, RTGCPTR GCPtr, uint32_t cb, uint32_t fFlags, PFNPGMRELOCATE pfnRelocate, void pvUser, const char pszDesc)
61	{
62	LogFlow(("PGMR3MapPT: GCPtr=%#x cb=%d fFlags=%#x pfnRelocate=%p pvUser=%p pszDesc=%s\n", GCPtr, cb, fFlags, pfnRelocate, pvUser, pszDesc));
63	AssertMsg(pVM->pgm.s.pInterPD, ("Paging isn't initialized, init order problems!\n"));
64
65	/*
66	* Validate input.
67	*/
68	Assert(!fFlags \|\| fFlags == PGMR3MAPPT_FLAGS_UNMAPPABLE);
69	if (cb < _2M \|\| cb > 64 * _1M)
70	{
71	AssertMsgFailed(("Serious? cb=%d\n", cb));
72	return VERR_INVALID_PARAMETER;
73	}
74	cb = RT_ALIGN_32(cb, _4M);
75	RTGCPTR GCPtrLast = GCPtr + cb - 1;
76	if (GCPtrLast < GCPtr)
77	{
78	AssertMsgFailed(("Range wraps! GCPtr=%x GCPtrLast=%x\n", GCPtr, GCPtrLast));
79	return VERR_INVALID_PARAMETER;
80	}
81	if (pVM->pgm.s.fMappingsFixed)
82	{
83	AssertMsgFailed(("Mappings are fixed! It's not possible to add new mappings at this time!\n"));
84	return VERR_PGM_MAPPINGS_FIXED;
85	}
86	if (!pfnRelocate)
87	{
88	AssertMsgFailed(("Callback is required\n"));
89	return VERR_INVALID_PARAMETER;
90	}
91
92	/*
93	* Find list location.
94	*/
95	PPGMMAPPING pPrev = NULL;
96	PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3;
97	while (pCur)
98	{
99	if (pCur->GCPtrLast >= GCPtr && pCur->GCPtr <= GCPtrLast)
100	{
101	AssertMsgFailed(("Address is already in use by %s. req %#x-%#x take %#x-%#x\n",
102	pCur->pszDesc, GCPtr, GCPtrLast, pCur->GCPtr, pCur->GCPtrLast));
103	LogRel(("VERR_PGM_MAPPING_CONFLICT: Address is already in use by %s. req %#x-%#x take %#x-%#x\n",
104	pCur->pszDesc, GCPtr, GCPtrLast, pCur->GCPtr, pCur->GCPtrLast));
105	return VERR_PGM_MAPPING_CONFLICT;
106	}
107	if (pCur->GCPtr > GCPtr)
108	break;
109	pPrev = pCur;
110	pCur = pCur->pNextR3;
111	}
112
113	/*
114	* Check for conflicts with intermediate mappings.
115	*/
116	const unsigned iPageDir = GCPtr >> X86_PD_SHIFT;
117	const unsigned cPTs = cb >> X86_PD_SHIFT;
118	if (pVM->pgm.s.fFinalizedMappings)
119	{
120	for (unsigned i = 0; i < cPTs; i++)
121	if (pVM->pgm.s.pInterPD->a[iPageDir + i].n.u1Present)
122	{
123	AssertMsgFailed(("Address %#x is already in use by an intermediate mapping.\n", GCPtr + (i << PAGE_SHIFT)));
124	LogRel(("VERR_PGM_MAPPING_CONFLICT: Address %#x is already in use by an intermediate mapping.\n", GCPtr + (i << PAGE_SHIFT)));
125	return VERR_PGM_MAPPING_CONFLICT;
126	}
127	/** @todo AMD64: add check in PAE structures too, so we can remove all the 32-Bit paging stuff there. */
128	}
129
130	/*
131	* Allocate and initialize the new list node.
132	*/
133	PPGMMAPPING pNew;
134	int rc;
135	if (fFlags & PGMR3MAPPT_FLAGS_UNMAPPABLE)
136	rc = MMHyperAlloc( pVM, RT_OFFSETOF(PGMMAPPING, aPTs[cPTs]), 0, MM_TAG_PGM_MAPPINGS, (void **)&pNew);
137	else
138	rc = MMR3HyperAllocOnceNoRel(pVM, RT_OFFSETOF(PGMMAPPING, aPTs[cPTs]), 0, MM_TAG_PGM_MAPPINGS, (void **)&pNew);
139	if (RT_FAILURE(rc))
140	return rc;
141	pNew->GCPtr = GCPtr;
142	pNew->GCPtrLast = GCPtrLast;
143	pNew->cb = cb;
144	pNew->pszDesc = pszDesc;
145	pNew->pfnRelocate = pfnRelocate;
146	pNew->pvUser = pvUser;
147	pNew->cPTs = cPTs;
148
149	/*
150	* Allocate page tables and insert them into the page directories.
151	* (One 32-bit PT and two PAE PTs.)
152	*/
153	uint8_t *pbPTs;
154	if (fFlags & PGMR3MAPPT_FLAGS_UNMAPPABLE)
155	rc = MMHyperAlloc( pVM, PAGE_SIZE * 3 * cPTs, PAGE_SIZE, MM_TAG_PGM_MAPPINGS, (void **)&pbPTs);
156	else
157	rc = MMR3HyperAllocOnceNoRel(pVM, PAGE_SIZE * 3 * cPTs, PAGE_SIZE, MM_TAG_PGM_MAPPINGS, (void **)&pbPTs);
158	if (RT_FAILURE(rc))
159	{
160	MMHyperFree(pVM, pNew);
161	return VERR_NO_MEMORY;
162	}
163
164	/*
165	* Init the page tables and insert them into the page directories.
166	*/
167	Log4(("PGMR3MapPT: GCPtr=%RGv cPTs=%u pbPTs=%p\n", GCPtr, cPTs, pbPTs));
168	for (unsigned i = 0; i < cPTs; i++)
169	{
170	/*
171	* 32-bit.
172	*/
173	pNew->aPTs[i].pPTR3 = (PX86PT)pbPTs;
174	pNew->aPTs[i].pPTRC = MMHyperR3ToRC(pVM, pNew->aPTs[i].pPTR3);
175	pNew->aPTs[i].pPTR0 = MMHyperR3ToR0(pVM, pNew->aPTs[i].pPTR3);
176	pNew->aPTs[i].HCPhysPT = MMR3HyperHCVirt2HCPhys(pVM, pNew->aPTs[i].pPTR3);
177	pbPTs += PAGE_SIZE;
178	Log4(("PGMR3MapPT: i=%d: pPTR3=%RHv pPTRC=%RRv pPRTR0=%RHv HCPhysPT=%RHp\n",
179	i, pNew->aPTs[i].pPTR3, pNew->aPTs[i].pPTRC, pNew->aPTs[i].pPTR0, pNew->aPTs[i].HCPhysPT));
180
181	/*
182	* PAE.
183	*/
184	pNew->aPTs[i].HCPhysPaePT0 = MMR3HyperHCVirt2HCPhys(pVM, pbPTs);
185	pNew->aPTs[i].HCPhysPaePT1 = MMR3HyperHCVirt2HCPhys(pVM, pbPTs + PAGE_SIZE);
186	pNew->aPTs[i].paPaePTsR3 = (PX86PTPAE)pbPTs;
187	pNew->aPTs[i].paPaePTsRC = MMHyperR3ToRC(pVM, pbPTs);
188	pNew->aPTs[i].paPaePTsR0 = MMHyperR3ToR0(pVM, pbPTs);
189	pbPTs += PAGE_SIZE * 2;
190	Log4(("PGMR3MapPT: i=%d: paPaePTsR#=%RHv paPaePTsRC=%RRv paPaePTsR#=%RHv HCPhysPaePT0=%RHp HCPhysPaePT1=%RHp\n",
191	i, pNew->aPTs[i].paPaePTsR3, pNew->aPTs[i].paPaePTsRC, pNew->aPTs[i].paPaePTsR0, pNew->aPTs[i].HCPhysPaePT0, pNew->aPTs[i].HCPhysPaePT1));
192	}
193	if (pVM->pgm.s.fFinalizedMappings)
194	pgmR3MapSetPDEs(pVM, pNew, iPageDir);
195	/* else PGMR3FinalizeMappings() */
196
197	/*
198	* Insert the new mapping.
199	*/
200	pNew->pNextR3 = pCur;
201	pNew->pNextRC = pCur ? MMHyperR3ToRC(pVM, pCur) : NIL_RTRCPTR;
202	pNew->pNextR0 = pCur ? MMHyperR3ToR0(pVM, pCur) : NIL_RTR0PTR;
203	if (pPrev)
204	{
205	pPrev->pNextR3 = pNew;
206	pPrev->pNextRC = MMHyperR3ToRC(pVM, pNew);
207	pPrev->pNextR0 = MMHyperR3ToR0(pVM, pNew);
208	}
209	else
210	{
211	pVM->pgm.s.pMappingsR3 = pNew;
212	pVM->pgm.s.pMappingsRC = MMHyperR3ToRC(pVM, pNew);
213	pVM->pgm.s.pMappingsR0 = MMHyperR3ToR0(pVM, pNew);
214	}
215
216	for (unsigned i=0;i<pVM->cCPUs;i++)
217	{
218	PVMCPU pVCpu = &pVM->aCpus[i];
219	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
220	}
221	return VINF_SUCCESS;
222	}
223
224
225	/**
226	* Removes a page table based mapping.
227	*
228	* @returns VBox status code.
229	* @param pVM VM Handle.
230	* @param GCPtr Virtual Address. (Page table aligned!)
231	*
232	* @remarks Don't call this without passing PGMR3MAPPT_FLAGS_UNMAPPABLE to
233	* PGMR3MapPT or you'll burn in the heap.
234	*/
235	VMMR3DECL(int) PGMR3UnmapPT(PVM pVM, RTGCPTR GCPtr)
236	{
237	LogFlow(("PGMR3UnmapPT: GCPtr=%#x\n", GCPtr));
238	AssertReturn(pVM->pgm.s.fFinalizedMappings, VERR_WRONG_ORDER);
239
240	/*
241	* Find it.
242	*/
243	PPGMMAPPING pPrev = NULL;
244	PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3;
245	while (pCur)
246	{
247	if (pCur->GCPtr == GCPtr)
248	{
249	/*
250	* Unlink it.
251	*/
252	if (pPrev)
253	{
254	pPrev->pNextR3 = pCur->pNextR3;
255	pPrev->pNextRC = pCur->pNextRC;
256	pPrev->pNextR0 = pCur->pNextR0;
257	}
258	else
259	{
260	pVM->pgm.s.pMappingsR3 = pCur->pNextR3;
261	pVM->pgm.s.pMappingsRC = pCur->pNextRC;
262	pVM->pgm.s.pMappingsR0 = pCur->pNextR0;
263	}
264
265	/*
266	* Free the page table memory, clear page directory entries
267	* and free the page tables and node memory.
268	*/
269	MMHyperFree(pVM, pCur->aPTs[0].pPTR3);
270	pgmR3MapClearPDEs(pVM, pCur, pCur->GCPtr >> X86_PD_SHIFT);
271	MMHyperFree(pVM, pCur);
272
273	for (unsigned i=0;i<pVM->cCPUs;i++)
274	{
275	PVMCPU pVCpu = &pVM->aCpus[i];
276	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
277	}
278	return VINF_SUCCESS;
279	}
280
281	/* done? */
282	if (pCur->GCPtr > GCPtr)
283	break;
284
285	/* next */
286	pPrev = pCur;
287	pCur = pCur->pNextR3;
288	}
289
290	AssertMsgFailed(("No mapping for %#x found!\n", GCPtr));
291	return VERR_INVALID_PARAMETER;
292	}
293
294
295	/**
296	* Checks whether a range of PDEs in the intermediate
297	* memory context are unused.
298	*
299	* We're talking 32-bit PDEs here.
300	*
301	* @returns true/false.
302	* @param pVM Pointer to the shared VM structure.
303	* @param iPD The first PDE in the range.
304	* @param cPTs The number of PDEs in the range.
305	*/
306	DECLINLINE(bool) pgmR3AreIntermediatePDEsUnused(PVM pVM, unsigned iPD, unsigned cPTs)
307	{
308	if (pVM->pgm.s.pInterPD->a[iPD].n.u1Present)
309	return false;
310	while (cPTs > 1)
311	{
312	iPD++;
313	if (pVM->pgm.s.pInterPD->a[iPD].n.u1Present)
314	return false;
315	cPTs--;
316	}
317	return true;
318	}
319
320
321	/**
322	* Unlinks the mapping.
323	*
324	* The mapping must be in the list.
325	*
326	* @param pVM Pointer to the shared VM structure.
327	* @param pMapping The mapping to unlink.
328	*/
329	static void pgmR3MapUnlink(PVM pVM, PPGMMAPPING pMapping)
330	{
331	PPGMMAPPING pAfterThis = pVM->pgm.s.pMappingsR3;
332	if (pAfterThis == pMapping)
333	{
334	/* head */
335	pVM->pgm.s.pMappingsR3 = pMapping->pNextR3;
336	pVM->pgm.s.pMappingsRC = pMapping->pNextRC;
337	pVM->pgm.s.pMappingsR0 = pMapping->pNextR0;
338	}
339	else
340	{
341	/* in the list */
342	while (pAfterThis->pNextR3 != pMapping)
343	{
344	pAfterThis = pAfterThis->pNextR3;
345	AssertReleaseReturnVoid(pAfterThis);
346	}
347
348	pAfterThis->pNextR3 = pMapping->pNextR3;
349	pAfterThis->pNextRC = pMapping->pNextRC;
350	pAfterThis->pNextR0 = pMapping->pNextR0;
351	}
352	}
353
354
355	/**
356	* Links the mapping.
357	*
358	* @param pVM Pointer to the shared VM structure.
359	* @param pMapping The mapping to linked.
360	*/
361	static void pgmR3MapLink(PVM pVM, PPGMMAPPING pMapping)
362	{
363	/*
364	* Find the list location (it's sorted by GCPhys) and link it in.
365	*/
366	if ( !pVM->pgm.s.pMappingsR3
367	\|\| pVM->pgm.s.pMappingsR3->GCPtr > pMapping->GCPtr)
368	{
369	/* head */
370	pMapping->pNextR3 = pVM->pgm.s.pMappingsR3;
371	pMapping->pNextRC = pVM->pgm.s.pMappingsRC;
372	pMapping->pNextR0 = pVM->pgm.s.pMappingsR0;
373	pVM->pgm.s.pMappingsR3 = pMapping;
374	pVM->pgm.s.pMappingsRC = MMHyperR3ToRC(pVM, pMapping);
375	pVM->pgm.s.pMappingsR0 = MMHyperR3ToR0(pVM, pMapping);
376	}
377	else
378	{
379	/* in the list */
380	PPGMMAPPING pAfterThis = pVM->pgm.s.pMappingsR3;
381	PPGMMAPPING pBeforeThis = pAfterThis->pNextR3;
382	while (pBeforeThis && pBeforeThis->GCPtr <= pMapping->GCPtr)
383	{
384	pAfterThis = pBeforeThis;
385	pBeforeThis = pBeforeThis->pNextR3;
386	}
387
388	pMapping->pNextR3 = pAfterThis->pNextR3;
389	pMapping->pNextRC = pAfterThis->pNextRC;
390	pMapping->pNextR0 = pAfterThis->pNextR0;
391	pAfterThis->pNextR3 = pMapping;
392	pAfterThis->pNextRC = MMHyperR3ToRC(pVM, pMapping);
393	pAfterThis->pNextR0 = MMHyperR3ToR0(pVM, pMapping);
394	}
395	}
396
397
398	/**
399	* Finalizes the intermediate context.
400	*
401	* This is called at the end of the ring-3 init and will construct the
402	* intermediate paging structures, relocating all the mappings in the process.
403	*
404	* @returns VBox status code.
405	* @param pVM Pointer to the shared VM structure.
406	* @thread EMT(0)
407	*/
408	VMMR3DECL(int) PGMR3FinalizeMappings(PVM pVM)
409	{
410	AssertReturn(!pVM->pgm.s.fFinalizedMappings, VERR_WRONG_ORDER);
411	pVM->pgm.s.fFinalizedMappings = true;
412
413	/*
414	* Loop until all mappings have been finalized.
415	*/
416	/unsigned iPDNext = UINT32_C(0xc0000000) >> X86_PD_SHIFT;/ /* makes CSAM/PATM freak out booting linux. :-/ */
417	#if 0
418	unsigned iPDNext = MM_HYPER_AREA_ADDRESS >> X86_PD_SHIFT;
419	#else
420	unsigned iPDNext = 1 << X86_PD_SHIFT; /* no hint, map them from the top. */
421	#endif
422	PPGMMAPPING pCur;
423	do
424	{
425	pCur = pVM->pgm.s.pMappingsR3;
426	while (pCur)
427	{
428	if (!pCur->fFinalized)
429	{
430	/*
431	* Find a suitable location.
432	*/
433	RTGCPTR const GCPtrOld = pCur->GCPtr;
434	const unsigned cPTs = pCur->cPTs;
435	unsigned iPDNew = iPDNext;
436	if ( iPDNew + cPTs >= X86_PG_ENTRIES /* exclude the last PD */
437	\|\| !pgmR3AreIntermediatePDEsUnused(pVM, iPDNew, cPTs)
438	\|\| !pCur->pfnRelocate(pVM, GCPtrOld, (RTGCPTR)iPDNew << X86_PD_SHIFT, PGMRELOCATECALL_SUGGEST, pCur->pvUser))
439	{
440	/* No luck, just scan down from 4GB-4MB, giving up at 4MB. */
441	iPDNew = X86_PG_ENTRIES - cPTs - 1;
442	while ( iPDNew > 0
443	&& ( !pgmR3AreIntermediatePDEsUnused(pVM, iPDNew, cPTs)
444	\|\| !pCur->pfnRelocate(pVM, GCPtrOld, (RTGCPTR)iPDNew << X86_PD_SHIFT, PGMRELOCATECALL_SUGGEST, pCur->pvUser))
445	)
446	iPDNew--;
447	AssertLogRelReturn(iPDNew != 0, VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
448	}
449
450	/*
451	* Relocate it (something akin to pgmR3MapRelocate).
452	*/
453	pgmR3MapSetPDEs(pVM, pCur, iPDNew);
454
455	/* unlink the mapping, update the entry and relink it. */
456	pgmR3MapUnlink(pVM, pCur);
457
458	RTGCPTR const GCPtrNew = (RTGCPTR)iPDNew << X86_PD_SHIFT;
459	pCur->GCPtr = GCPtrNew;
460	pCur->GCPtrLast = GCPtrNew + pCur->cb - 1;
461	pCur->fFinalized = true;
462
463	pgmR3MapLink(pVM, pCur);
464
465	/* Finally work the callback. */
466	pCur->pfnRelocate(pVM, GCPtrOld, GCPtrNew, PGMRELOCATECALL_RELOCATE, pCur->pvUser);
467
468	/*
469	* The list order might have changed, start from the beginning again.
470	*/
471	iPDNext = iPDNew + cPTs;
472	break;
473	}
474
475	/* next */
476	pCur = pCur->pNextR3;
477	}
478	} while (pCur);
479
480	return VINF_SUCCESS;
481	}
482
483
484	/**
485	* Gets the size of the current guest mappings if they were to be
486	* put next to oneanother.
487	*
488	* @returns VBox status code.
489	* @param pVM The VM.
490	* @param pcb Where to store the size.
491	*/
492	VMMR3DECL(int) PGMR3MappingsSize(PVM pVM, uint32_t *pcb)
493	{
494	RTGCPTR cb = 0;
495	for (PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3; pCur; pCur = pCur->pNextR3)
496	cb += pCur->cb;
497
498	*pcb = cb;
499	AssertReturn(*pcb == cb, VERR_NUMBER_TOO_BIG);
500	Log(("PGMR3MappingsSize: return %d (%#x) bytes\n", cb, cb));
501	return VINF_SUCCESS;
502	}
503
504
505	/**
506	* Fixes the guest context mappings in a range reserved from the Guest OS.
507	*
508	* @returns VBox status code.
509	* @param pVM The VM.
510	* @param GCPtrBase The address of the reserved range of guest memory.
511	* @param cb The size of the range starting at GCPtrBase.
512	*/
513	VMMR3DECL(int) PGMR3MappingsFix(PVM pVM, RTGCPTR GCPtrBase, uint32_t cb)
514	{
515	Log(("PGMR3MappingsFix: GCPtrBase=%#x cb=%#x\n", GCPtrBase, cb));
516
517	/* Ignore the additions mapping fix call in VT-x/AMD-V. */
518	if ( pVM->pgm.s.fMappingsFixed
519	&& HWACCMR3IsActive(pVM))
520	return VINF_SUCCESS;
521
522	/* Only applies to VCPU 0 as we don't support SMP guests with raw mode. */
523	Assert(pVM->cCPUs == 1);
524
525	PVMCPU pVCpu = &pVM->aCpus[0];
526
527	/*
528	* This is all or nothing at all. So, a tiny bit of paranoia first.
529	*/
530	if (GCPtrBase & X86_PAGE_4M_OFFSET_MASK)
531	{
532	AssertMsgFailed(("GCPtrBase (%#x) has to be aligned on a 4MB address!\n", GCPtrBase));
533	return VERR_INVALID_PARAMETER;
534	}
535	if (!cb \|\| (cb & X86_PAGE_4M_OFFSET_MASK))
536	{
537	AssertMsgFailed(("cb (%#x) is 0 or not aligned on a 4MB address!\n", cb));
538	return VERR_INVALID_PARAMETER;
539	}
540
541	/*
542	* Before we do anything we'll do a forced PD sync to try make sure any
543	* pending relocations because of these mappings have been resolved.
544	*/
545	PGMSyncCR3(pVCpu, CPUMGetGuestCR0(pVCpu), CPUMGetGuestCR3(pVCpu), CPUMGetGuestCR4(pVCpu), true);
546
547	/*
548	* Check that it's not conflicting with a core code mapping in the intermediate page table.
549	*/
550	unsigned iPDNew = GCPtrBase >> X86_PD_SHIFT;
551	unsigned i = cb >> X86_PD_SHIFT;
552	while (i-- > 0)
553	{
554	if (pVM->pgm.s.pInterPD->a[iPDNew + i].n.u1Present)
555	{
556	/* Check that it's not one or our mappings. */
557	PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3;
558	while (pCur)
559	{
560	if (iPDNew + i - (pCur->GCPtr >> X86_PD_SHIFT) < (pCur->cb >> X86_PD_SHIFT))
561	break;
562	pCur = pCur->pNextR3;
563	}
564	if (!pCur)
565	{
566	LogRel(("PGMR3MappingsFix: Conflicts with intermediate PDE %#x (GCPtrBase=%RGv cb=%#zx). The guest should retry.\n",
567	iPDNew + i, GCPtrBase, cb));
568	return VERR_PGM_MAPPINGS_FIX_CONFLICT;
569	}
570	}
571	}
572
573	/*
574	* In PAE / PAE mode, make sure we don't cross page directories.
575	*/
576	if ( ( pVCpu->pgm.s.enmGuestMode == PGMMODE_PAE
577	\|\| pVCpu->pgm.s.enmGuestMode == PGMMODE_PAE_NX)
578	&& ( pVCpu->pgm.s.enmShadowMode == PGMMODE_PAE
579	\|\| pVCpu->pgm.s.enmShadowMode == PGMMODE_PAE_NX))
580	{
581	unsigned iPdptBase = GCPtrBase >> X86_PDPT_SHIFT;
582	unsigned iPdptLast = (GCPtrBase + cb - 1) >> X86_PDPT_SHIFT;
583	if (iPdptBase != iPdptLast)
584	{
585	LogRel(("PGMR3MappingsFix: Crosses PD boundrary; iPdptBase=%#x iPdptLast=%#x (GCPtrBase=%RGv cb=%#zx). The guest should retry.\n",
586	iPdptBase, iPdptLast, GCPtrBase, cb));
587	return VERR_PGM_MAPPINGS_FIX_CONFLICT;
588	}
589	}
590
591	/*
592	* Loop the mappings and check that they all agree on their new locations.
593	*/
594	RTGCPTR GCPtrCur = GCPtrBase;
595	PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3;
596	while (pCur)
597	{
598	if (!pCur->pfnRelocate(pVM, pCur->GCPtr, GCPtrCur, PGMRELOCATECALL_SUGGEST, pCur->pvUser))
599	{
600	AssertMsgFailed(("The suggested fixed address %#x was rejected by '%s'!\n", GCPtrCur, pCur->pszDesc));
601	return VERR_PGM_MAPPINGS_FIX_REJECTED;
602	}
603	/* next */
604	GCPtrCur += pCur->cb;
605	pCur = pCur->pNextR3;
606	}
607	if (GCPtrCur > GCPtrBase + cb)
608	{
609	AssertMsgFailed(("cb (%#x) is less than the required range %#x!\n", cb, GCPtrCur - GCPtrBase));
610	return VERR_PGM_MAPPINGS_FIX_TOO_SMALL;
611	}
612
613	/*
614	* Loop the table assigning the mappings to the passed in memory
615	* and call their relocator callback.
616	*/
617	GCPtrCur = GCPtrBase;
618	pCur = pVM->pgm.s.pMappingsR3;
619	while (pCur)
620	{
621	unsigned iPDOld = pCur->GCPtr >> X86_PD_SHIFT;
622	iPDNew = GCPtrCur >> X86_PD_SHIFT;
623
624	/*
625	* Relocate the page table(s).
626	*/
627	pgmR3MapClearPDEs(pVM, pCur, iPDOld);
628	pgmR3MapSetPDEs(pVM, pCur, iPDNew);
629
630	/*
631	* Update the entry.
632	*/
633	pCur->GCPtr = GCPtrCur;
634	pCur->GCPtrLast = GCPtrCur + pCur->cb - 1;
635
636	/*
637	* Callback to execute the relocation.
638	*/
639	pCur->pfnRelocate(pVM, iPDOld << X86_PD_SHIFT, iPDNew << X86_PD_SHIFT, PGMRELOCATECALL_RELOCATE, pCur->pvUser);
640
641	/*
642	* Advance.
643	*/
644	GCPtrCur += pCur->cb;
645	pCur = pCur->pNextR3;
646	}
647
648	/*
649	* Mark the mappings as fixed and return.
650	*/
651	pVM->pgm.s.fMappingsFixed = true;
652	pVM->pgm.s.GCPtrMappingFixed = GCPtrBase;
653	pVM->pgm.s.cbMappingFixed = cb;
654
655	for (unsigned i=0;i<pVM->cCPUs;i++)
656	{
657	PVMCPU pVCpu = &pVM->aCpus[i];
658	pVCpu->pgm.s.fSyncFlags &= ~PGM_SYNC_MONITOR_CR3;
659	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
660	}
661	return VINF_SUCCESS;
662	}
663
664	/**
665	* Disable the hypervisor mappings in the shadow page tables (doesn't touch the intermediate table!)
666	*
667	* @returns VBox status code.
668	* @param pVM The VM.
669	*/
670	VMMR3DECL(int) PGMR3MappingsDisable(PVM pVM)
671	{
672	uint32_t cb;
673	int rc = PGMR3MappingsSize(pVM, &cb);
674	AssertRCReturn(rc, rc);
675
676	/* Only applies to VCPU 0. */
677	PVMCPU pVCpu = &pVM->aCpus[0];
678
679	rc = pgmMapDeactivateCR3(pVM, pVCpu->pgm.s.pShwPageCR3R3);
680	AssertRCReturn(rc, rc);
681
682	/*
683	* Mark the mappings as fixed (using fake values) and disabled.
684	*/
685	pVM->pgm.s.fDisableMappings = true;
686	pVM->pgm.s.fMappingsFixed = true;
687	pVM->pgm.s.GCPtrMappingFixed = MM_HYPER_AREA_ADDRESS;
688	pVM->pgm.s.cbMappingFixed = cb;
689	for (unsigned i=0;i<pVM->cCPUs;i++)
690	{
691	PVMCPU pVCpu = &pVM->aCpus[i];
692
693	pVCpu->pgm.s.fSyncFlags &= ~PGM_SYNC_MONITOR_CR3;
694	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
695	}
696	return VINF_SUCCESS;
697	}
698
699
700	/**
701	* Unfixes the mappings.
702	* After calling this function mapping conflict detection will be enabled.
703	*
704	* @returns VBox status code.
705	* @param pVM The VM.
706	*/
707	VMMR3DECL(int) PGMR3MappingsUnfix(PVM pVM)
708	{
709	Log(("PGMR3MappingsUnfix: fMappingsFixed=%d\n", pVM->pgm.s.fMappingsFixed));
710
711	/* Ignore in VT-x/AMD-V mode. */
712	if (HWACCMR3IsActive(pVM))
713	return VINF_SUCCESS;
714
715	pVM->pgm.s.fMappingsFixed = false;
716	pVM->pgm.s.GCPtrMappingFixed = 0;
717	pVM->pgm.s.cbMappingFixed = 0;
718	for (unsigned i=0;i<pVM->cCPUs;i++)
719	{
720	PVMCPU pVCpu = &pVM->aCpus[i];
721
722	VMCPU_FF_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3);
723	}
724	return VINF_SUCCESS;
725	}
726
727
728	/**
729	* Map pages into the intermediate context (switcher code).
730	* These pages are mapped at both the give virtual address and at
731	* the physical address (for identity mapping).
732	*
733	* @returns VBox status code.
734	* @param pVM The virtual machine.
735	* @param Addr Intermediate context address of the mapping.
736	* @param HCPhys Start of the range of physical pages. This must be entriely below 4GB!
737	* @param cbPages Number of bytes to map.
738	*
739	* @remark This API shall not be used to anything but mapping the switcher code.
740	*/
741	VMMR3DECL(int) PGMR3MapIntermediate(PVM pVM, RTUINTPTR Addr, RTHCPHYS HCPhys, unsigned cbPages)
742	{
743	LogFlow(("PGMR3MapIntermediate: Addr=%RTptr HCPhys=%RHp cbPages=%#x\n", Addr, HCPhys, cbPages));
744
745	/*
746	* Adjust input.
747	*/
748	cbPages += (uint32_t)HCPhys & PAGE_OFFSET_MASK;
749	cbPages = RT_ALIGN(cbPages, PAGE_SIZE);
750	HCPhys &= X86_PTE_PAE_PG_MASK;
751	Addr &= PAGE_BASE_MASK;
752	/* We only care about the first 4GB, because on AMD64 we'll be repeating them all over the address space. */
753	uint32_t uAddress = (uint32_t)Addr;
754
755	/*
756	* Assert input and state.
757	*/
758	AssertMsg(pVM->pgm.s.offVM, ("Bad init order\n"));
759	AssertMsg(pVM->pgm.s.pInterPD, ("Bad init order, paging.\n"));
760	AssertMsg(cbPages <= (512 << PAGE_SHIFT), ("The mapping is too big %d bytes\n", cbPages));
761	AssertMsg(HCPhys < _4G && HCPhys + cbPages < _4G, ("Addr=%RTptr HCPhys=%RHp cbPages=%d\n", Addr, HCPhys, cbPages));
762	AssertReturn(!pVM->pgm.s.fFinalizedMappings, VERR_WRONG_ORDER);
763
764	/*
765	* Check for internal conflicts between the virtual address and the physical address.
766	* A 1:1 mapping is fine, but partial overlapping is a no-no.
767	*/
768	if ( uAddress != HCPhys
769	&& ( uAddress < HCPhys
770	? HCPhys - uAddress < cbPages
771	: uAddress - HCPhys < cbPages
772	)
773	)
774	AssertLogRelMsgFailedReturn(("Addr=%RTptr HCPhys=%RHp cbPages=%d\n", Addr, HCPhys, cbPages),
775	VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
776
777	const unsigned cPages = cbPages >> PAGE_SHIFT;
778	int rc = pgmR3MapIntermediateCheckOne(pVM, uAddress, cPages, pVM->pgm.s.apInterPTs[0], pVM->pgm.s.apInterPaePTs[0]);
779	if (RT_FAILURE(rc))
780	return rc;
781	rc = pgmR3MapIntermediateCheckOne(pVM, (uintptr_t)HCPhys, cPages, pVM->pgm.s.apInterPTs[1], pVM->pgm.s.apInterPaePTs[1]);
782	if (RT_FAILURE(rc))
783	return rc;
784
785	/*
786	* Everythings fine, do the mapping.
787	*/
788	pgmR3MapIntermediateDoOne(pVM, uAddress, HCPhys, cPages, pVM->pgm.s.apInterPTs[0], pVM->pgm.s.apInterPaePTs[0]);
789	pgmR3MapIntermediateDoOne(pVM, (uintptr_t)HCPhys, HCPhys, cPages, pVM->pgm.s.apInterPTs[1], pVM->pgm.s.apInterPaePTs[1]);
790
791	return VINF_SUCCESS;
792	}
793
794
795	/**
796	* Validates that there are no conflicts for this mapping into the intermediate context.
797	*
798	* @returns VBox status code.
799	* @param pVM VM handle.
800	* @param uAddress Address of the mapping.
801	* @param cPages Number of pages.
802	* @param pPTDefault Pointer to the default page table for this mapping.
803	* @param pPTPaeDefault Pointer to the default page table for this mapping.
804	*/
805	static int pgmR3MapIntermediateCheckOne(PVM pVM, uintptr_t uAddress, unsigned cPages, PX86PT pPTDefault, PX86PTPAE pPTPaeDefault)
806	{
807	AssertMsg((uAddress >> X86_PD_SHIFT) + cPages <= 1024, ("64-bit fixme\n"));
808
809	/*
810	* Check that the ranges are available.
811	* (This code doesn't have to be fast.)
812	*/
813	while (cPages > 0)
814	{
815	/*
816	* 32-Bit.
817	*/
818	unsigned iPDE = (uAddress >> X86_PD_SHIFT) & X86_PD_MASK;
819	unsigned iPTE = (uAddress >> X86_PT_SHIFT) & X86_PT_MASK;
820	PX86PT pPT = pPTDefault;
821	if (pVM->pgm.s.pInterPD->a[iPDE].u)
822	{
823	RTHCPHYS HCPhysPT = pVM->pgm.s.pInterPD->a[iPDE].u & X86_PDE_PG_MASK;
824	if (HCPhysPT == MMPage2Phys(pVM, pVM->pgm.s.apInterPTs[0]))
825	pPT = pVM->pgm.s.apInterPTs[0];
826	else if (HCPhysPT == MMPage2Phys(pVM, pVM->pgm.s.apInterPTs[1]))
827	pPT = pVM->pgm.s.apInterPTs[1];
828	else
829	{
830	/** @todo this must be handled with a relocation of the conflicting mapping!
831	* Which of course cannot be done because we're in the middle of the initialization. bad design! */
832	AssertLogRelMsgFailedReturn(("Conflict between core code and PGMR3Mapping(). uAddress=%RHv\n", uAddress),
833	VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
834	}
835	}
836	if (pPT->a[iPTE].u)
837	AssertLogRelMsgFailedReturn(("Conflict iPTE=%#x iPDE=%#x uAddress=%RHv pPT->a[iPTE].u=%RX32\n", iPTE, iPDE, uAddress, pPT->a[iPTE].u),
838	VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
839
840	/*
841	* PAE.
842	*/
843	const unsigned iPDPE= (uAddress >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE;
844	iPDE = (uAddress >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK;
845	iPTE = (uAddress >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK;
846	Assert(iPDPE < 4);
847	Assert(pVM->pgm.s.apInterPaePDs[iPDPE]);
848	PX86PTPAE pPTPae = pPTPaeDefault;
849	if (pVM->pgm.s.apInterPaePDs[iPDPE]->a[iPDE].u)
850	{
851	RTHCPHYS HCPhysPT = pVM->pgm.s.apInterPaePDs[iPDPE]->a[iPDE].u & X86_PDE_PAE_PG_MASK;
852	if (HCPhysPT == MMPage2Phys(pVM, pVM->pgm.s.apInterPaePTs[0]))
853	pPTPae = pVM->pgm.s.apInterPaePTs[0];
854	else if (HCPhysPT == MMPage2Phys(pVM, pVM->pgm.s.apInterPaePTs[0]))
855	pPTPae = pVM->pgm.s.apInterPaePTs[1];
856	else
857	{
858	/** @todo this must be handled with a relocation of the conflicting mapping!
859	* Which of course cannot be done because we're in the middle of the initialization. bad design! */
860	AssertLogRelMsgFailedReturn(("Conflict between core code and PGMR3Mapping(). uAddress=%RHv\n", uAddress),
861	VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
862	}
863	}
864	if (pPTPae->a[iPTE].u)
865	AssertLogRelMsgFailedReturn(("Conflict iPTE=%#x iPDE=%#x uAddress=%RHv pPTPae->a[iPTE].u=%#RX64\n", iPTE, iPDE, uAddress, pPTPae->a[iPTE].u),
866	VERR_PGM_INTERMEDIATE_PAGING_CONFLICT);
867
868	/* next */
869	uAddress += PAGE_SIZE;
870	cPages--;
871	}
872
873	return VINF_SUCCESS;
874	}
875
876
877
878	/**
879	* Sets up the intermediate page tables for a verified mapping.
880	*
881	* @param pVM VM handle.
882	* @param uAddress Address of the mapping.
883	* @param HCPhys The physical address of the page range.
884	* @param cPages Number of pages.
885	* @param pPTDefault Pointer to the default page table for this mapping.
886	* @param pPTPaeDefault Pointer to the default page table for this mapping.
887	*/
888	static void pgmR3MapIntermediateDoOne(PVM pVM, uintptr_t uAddress, RTHCPHYS HCPhys, unsigned cPages, PX86PT pPTDefault, PX86PTPAE pPTPaeDefault)
889	{
890	while (cPages > 0)
891	{
892	/*
893	* 32-Bit.
894	*/
895	unsigned iPDE = (uAddress >> X86_PD_SHIFT) & X86_PD_MASK;
896	unsigned iPTE = (uAddress >> X86_PT_SHIFT) & X86_PT_MASK;
897	PX86PT pPT;
898	if (pVM->pgm.s.pInterPD->a[iPDE].u)
899	pPT = (PX86PT)MMPagePhys2Page(pVM, pVM->pgm.s.pInterPD->a[iPDE].u & X86_PDE_PG_MASK);
900	else
901	{
902	pVM->pgm.s.pInterPD->a[iPDE].u = X86_PDE_P \| X86_PDE_A \| X86_PDE_RW
903	\| (uint32_t)MMPage2Phys(pVM, pPTDefault);
904	pPT = pPTDefault;
905	}
906	pPT->a[iPTE].u = X86_PTE_P \| X86_PTE_RW \| X86_PTE_A \| X86_PTE_D \| (uint32_t)HCPhys;
907
908	/*
909	* PAE
910	*/
911	const unsigned iPDPE= (uAddress >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE;
912	iPDE = (uAddress >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK;
913	iPTE = (uAddress >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK;
914	Assert(iPDPE < 4);
915	Assert(pVM->pgm.s.apInterPaePDs[iPDPE]);
916	PX86PTPAE pPTPae;
917	if (pVM->pgm.s.apInterPaePDs[iPDPE]->a[iPDE].u)
918	pPTPae = (PX86PTPAE)MMPagePhys2Page(pVM, pVM->pgm.s.apInterPaePDs[iPDPE]->a[iPDE].u & X86_PDE_PAE_PG_MASK);
919	else
920	{
921	pPTPae = pPTPaeDefault;
922	pVM->pgm.s.apInterPaePDs[iPDPE]->a[iPDE].u = X86_PDE_P \| X86_PDE_A \| X86_PDE_RW
923	\| MMPage2Phys(pVM, pPTPaeDefault);
924	}
925	pPTPae->a[iPTE].u = X86_PTE_P \| X86_PTE_RW \| X86_PTE_A \| X86_PTE_D \| HCPhys;
926
927	/* next */
928	cPages--;
929	HCPhys += PAGE_SIZE;
930	uAddress += PAGE_SIZE;
931	}
932	}
933
934
935	/**
936	* Clears all PDEs involved with the mapping in the shadow and intermediate page tables.
937	*
938	* @param pVM The VM handle.
939	* @param pMap Pointer to the mapping in question.
940	* @param iOldPDE The index of the 32-bit PDE corresponding to the base of the mapping.
941	*/
942	static void pgmR3MapClearPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iOldPDE)
943	{
944	unsigned i = pMap->cPTs;
945	PVMCPU pVCpu = VMMGetCpu(pVM);
946
947	pgmMapClearShadowPDEs(pVM, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3), pMap, iOldPDE, false /fDeactivateCR3/);
948
949	iOldPDE += i;
950	while (i-- > 0)
951	{
952	iOldPDE--;
953
954	/*
955	* 32-bit.
956	*/
957	pVM->pgm.s.pInterPD->a[iOldPDE].u = 0;
958	/*
959	* PAE.
960	*/
961	const unsigned iPD = iOldPDE / 256; /* iOldPDE * 2 / 512; iOldPDE is in 4 MB pages */
962	unsigned iPDE = iOldPDE * 2 % 512;
963	pVM->pgm.s.apInterPaePDs[iPD]->a[iPDE].u = 0;
964	iPDE++;
965	AssertFatal(iPDE < 512);
966	pVM->pgm.s.apInterPaePDs[iPD]->a[iPDE].u = 0;
967	}
968	}
969
970	/**
971	* Sets all PDEs involved with the mapping in the shadow and intermediate page tables.
972	*
973	* @param pVM The VM handle.
974	* @param pMap Pointer to the mapping in question.
975	* @param iNewPDE The index of the 32-bit PDE corresponding to the base of the mapping.
976	*/
977	static void pgmR3MapSetPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iNewPDE)
978	{
979	PPGM pPGM = &pVM->pgm.s;
980	PVMCPU pVCpu = VMMGetCpu(pVM);
981
982	Assert(!pgmMapAreMappingsEnabled(&pVM->pgm.s) \|\| PGMGetGuestMode(pVCpu) <= PGMMODE_PAE_NX);
983
984	pgmMapSetShadowPDEs(pVM, pMap, iNewPDE);
985
986	/*
987	* Init the page tables and insert them into the page directories.
988	*/
989	unsigned i = pMap->cPTs;
990	iNewPDE += i;
991	while (i-- > 0)
992	{
993	iNewPDE--;
994
995	/*
996	* 32-bit.
997	*/
998	X86PDE Pde;
999	/* Default mapping page directory flags are read/write and supervisor; individual page attributes determine the final flags */
1000	Pde.u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| (uint32_t)pMap->aPTs[i].HCPhysPT;
1001	pPGM->pInterPD->a[iNewPDE] = Pde;
1002	/*
1003	* PAE.
1004	*/
1005	const unsigned iPD = iNewPDE / 256;
1006	unsigned iPDE = iNewPDE * 2 % 512;
1007	X86PDEPAE PdePae0;
1008	PdePae0.u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT0;
1009	pPGM->apInterPaePDs[iPD]->a[iPDE] = PdePae0;
1010	iPDE++;
1011	AssertFatal(iPDE < 512);
1012	X86PDEPAE PdePae1;
1013	PdePae1.u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT1;
1014	pPGM->apInterPaePDs[iPD]->a[iPDE] = PdePae1;
1015	}
1016	}
1017
1018	/**
1019	* Relocates a mapping to a new address.
1020	*
1021	* @param pVM VM handle.
1022	* @param pMapping The mapping to relocate.
1023	* @param GCPtrOldMapping The address of the start of the old mapping.
1024	* @param GCPtrNewMapping The address of the start of the new mapping.
1025	*/
1026	void pgmR3MapRelocate(PVM pVM, PPGMMAPPING pMapping, RTGCPTR GCPtrOldMapping, RTGCPTR GCPtrNewMapping)
1027	{
1028	unsigned iPDOld = GCPtrOldMapping >> X86_PD_SHIFT;
1029	unsigned iPDNew = GCPtrNewMapping >> X86_PD_SHIFT;
1030
1031	Log(("PGM: Relocating %s from %RGv to %RGv\n", pMapping->pszDesc, GCPtrOldMapping, GCPtrNewMapping));
1032	AssertMsg(((unsigned)iPDOld << X86_PD_SHIFT) == pMapping->GCPtr, ("%RGv vs %RGv\n", (RTGCPTR)((unsigned)iPDOld << X86_PD_SHIFT), pMapping->GCPtr));
1033
1034	/*
1035	* Relocate the page table(s).
1036	*/
1037	pgmR3MapClearPDEs(pVM, pMapping, iPDOld);
1038	pgmR3MapSetPDEs(pVM, pMapping, iPDNew);
1039
1040	/*
1041	* Update and resort the mapping list.
1042	*/
1043
1044	/* Find previous mapping for pMapping, put result into pPrevMap. */
1045	PPGMMAPPING pPrevMap = NULL;
1046	PPGMMAPPING pCur = pVM->pgm.s.pMappingsR3;
1047	while (pCur && pCur != pMapping)
1048	{
1049	/* next */
1050	pPrevMap = pCur;
1051	pCur = pCur->pNextR3;
1052	}
1053	Assert(pCur);
1054
1055	/* Find mapping which >= than pMapping. */
1056	RTGCPTR GCPtrNew = iPDNew << X86_PD_SHIFT;
1057	PPGMMAPPING pPrev = NULL;
1058	pCur = pVM->pgm.s.pMappingsR3;
1059	while (pCur && pCur->GCPtr < GCPtrNew)
1060	{
1061	/* next */
1062	pPrev = pCur;
1063	pCur = pCur->pNextR3;
1064	}
1065
1066	if (pCur != pMapping && pPrev != pMapping)
1067	{
1068	/*
1069	* Unlink.
1070	*/
1071	if (pPrevMap)
1072	{
1073	pPrevMap->pNextR3 = pMapping->pNextR3;
1074	pPrevMap->pNextRC = pMapping->pNextRC;
1075	pPrevMap->pNextR0 = pMapping->pNextR0;
1076	}
1077	else
1078	{
1079	pVM->pgm.s.pMappingsR3 = pMapping->pNextR3;
1080	pVM->pgm.s.pMappingsRC = pMapping->pNextRC;
1081	pVM->pgm.s.pMappingsR0 = pMapping->pNextR0;
1082	}
1083
1084	/*
1085	* Link
1086	*/
1087	pMapping->pNextR3 = pCur;
1088	if (pPrev)
1089	{
1090	pMapping->pNextRC = pPrev->pNextRC;
1091	pMapping->pNextR0 = pPrev->pNextR0;
1092	pPrev->pNextR3 = pMapping;
1093	pPrev->pNextRC = MMHyperR3ToRC(pVM, pMapping);
1094	pPrev->pNextR0 = MMHyperR3ToR0(pVM, pMapping);
1095	}
1096	else
1097	{
1098	pMapping->pNextRC = pVM->pgm.s.pMappingsRC;
1099	pMapping->pNextR0 = pVM->pgm.s.pMappingsR0;
1100	pVM->pgm.s.pMappingsR3 = pMapping;
1101	pVM->pgm.s.pMappingsRC = MMHyperR3ToRC(pVM, pMapping);
1102	pVM->pgm.s.pMappingsR0 = MMHyperR3ToR0(pVM, pMapping);
1103	}
1104	}
1105
1106	/*
1107	* Update the entry.
1108	*/
1109	pMapping->GCPtr = GCPtrNew;
1110	pMapping->GCPtrLast = GCPtrNew + pMapping->cb - 1;
1111
1112	/*
1113	* Callback to execute the relocation.
1114	*/
1115	pMapping->pfnRelocate(pVM, iPDOld << X86_PD_SHIFT, iPDNew << X86_PD_SHIFT, PGMRELOCATECALL_RELOCATE, pMapping->pvUser);
1116	}
1117
1118
1119	/**
1120	* Checks if a new mapping address wasn't previously used and caused a clash with guest mappings.
1121	*
1122	* @returns VBox status code.
1123	* @param pMapping The mapping which conflicts.
1124	* @param GCPtr New mapping address to try
1125	*/
1126	bool pgmR3MapIsKnownConflictAddress(PPGMMAPPING pMapping, RTGCPTR GCPtr)
1127	{
1128	for (unsigned i = 0; i < RT_ELEMENTS(pMapping->aGCPtrConflicts); i++)
1129	{
1130	if (GCPtr == pMapping->aGCPtrConflicts[i])
1131	return true;
1132	}
1133	return false;
1134	}
1135
1136
1137	/**
1138	* Resolves a conflict between a page table based GC mapping and
1139	* the Guest OS page tables. (32 bits version)
1140	*
1141	* @returns VBox status code.
1142	* @param pVM VM Handle.
1143	* @param pMapping The mapping which conflicts.
1144	* @param pPDSrc The page directory of the guest OS.
1145	* @param GCPtrOldMapping The address of the start of the current mapping.
1146	*/
1147	int pgmR3SyncPTResolveConflict(PVM pVM, PPGMMAPPING pMapping, PX86PD pPDSrc, RTGCPTR GCPtrOldMapping)
1148	{
1149	STAM_REL_COUNTER_INC(&pVM->pgm.s.cRelocations);
1150	STAM_PROFILE_START(&pVM->pgm.s.StatR3ResolveConflict, a);
1151
1152	/* Raw mode only which implies one VCPU. */
1153	Assert(pVM->cCPUs == 1);
1154
1155	pMapping->aGCPtrConflicts[pMapping->cConflicts & (PGMMAPPING_CONFLICT_MAX-1)] = GCPtrOldMapping;
1156	pMapping->cConflicts++;
1157
1158	/*
1159	* Scan for free page directory entries.
1160	*
1161	* Note that we do not support mappings at the very end of the
1162	* address space since that will break our GCPtrEnd assumptions.
1163	*/
1164	const unsigned cPTs = pMapping->cPTs;
1165	unsigned iPDNew = RT_ELEMENTS(pPDSrc->a) - cPTs; /* (+ 1 - 1) */
1166	while (iPDNew-- > 0)
1167	{
1168	if (pPDSrc->a[iPDNew].n.u1Present)
1169	continue;
1170
1171	if (pgmR3MapIsKnownConflictAddress(pMapping, iPDNew << X86_PD_SHIFT))
1172	continue;
1173
1174	if (cPTs > 1)
1175	{
1176	bool fOk = true;
1177	for (unsigned i = 1; fOk && i < cPTs; i++)
1178	if (pPDSrc->a[iPDNew + i].n.u1Present)
1179	fOk = false;
1180	if (!fOk)
1181	continue;
1182	}
1183
1184	/*
1185	* Check that it's not conflicting with an intermediate page table mapping.
1186	*/
1187	bool fOk = true;
1188	unsigned i = cPTs;
1189	while (fOk && i-- > 0)
1190	fOk = !pVM->pgm.s.pInterPD->a[iPDNew + i].n.u1Present;
1191	if (!fOk)
1192	continue;
1193	/** @todo AMD64 should check the PAE directories and skip the 32bit stuff. */
1194
1195	/*
1196	* Ask for the mapping.
1197	*/
1198	RTGCPTR GCPtrNewMapping = iPDNew << X86_PD_SHIFT;
1199
1200	if (pMapping->pfnRelocate(pVM, GCPtrOldMapping, GCPtrNewMapping, PGMRELOCATECALL_SUGGEST, pMapping->pvUser))
1201	{
1202	pgmR3MapRelocate(pVM, pMapping, GCPtrOldMapping, GCPtrNewMapping);
1203	STAM_PROFILE_STOP(&pVM->pgm.s.StatR3ResolveConflict, a);
1204	return VINF_SUCCESS;
1205	}
1206	}
1207
1208	STAM_PROFILE_STOP(&pVM->pgm.s.StatR3ResolveConflict, a);
1209	AssertMsgFailed(("Failed to relocate page table mapping '%s' from %#x! (cPTs=%d)\n", pMapping->pszDesc, GCPtrOldMapping, cPTs));
1210	return VERR_PGM_NO_HYPERVISOR_ADDRESS;
1211	}
1212
1213
1214	/**
1215	* Resolves a conflict between a page table based GC mapping and
1216	* the Guest OS page tables. (PAE bits version)
1217	*
1218	* @returns VBox status code.
1219	* @param pVM VM Handle.
1220	* @param pMapping The mapping which conflicts.
1221	* @param GCPtrOldMapping The address of the start of the current mapping.
1222	*/
1223	int pgmR3SyncPTResolveConflictPAE(PVM pVM, PPGMMAPPING pMapping, RTGCPTR GCPtrOldMapping)
1224	{
1225	STAM_REL_COUNTER_INC(&pVM->pgm.s.cRelocations);
1226	STAM_PROFILE_START(&pVM->pgm.s.StatR3ResolveConflict, a);
1227
1228	/* Raw mode only which implies one VCPU. */
1229	Assert(pVM->cCPUs == 1);
1230	PVMCPU pVCpu = VMMGetCpu(pVM);
1231
1232	pMapping->aGCPtrConflicts[pMapping->cConflicts & (PGMMAPPING_CONFLICT_MAX-1)] = GCPtrOldMapping;
1233	pMapping->cConflicts++;
1234
1235	for (int iPDPTE = X86_PG_PAE_PDPE_ENTRIES - 1; iPDPTE >= 0; iPDPTE--)
1236	{
1237	unsigned iPDSrc;
1238	PX86PDPAE pPDSrc = pgmGstGetPaePDPtr(&pVCpu->pgm.s, (RTGCPTR32)iPDPTE << X86_PDPT_SHIFT, &iPDSrc, NULL);
1239
1240	/*
1241	* Scan for free page directory entries.
1242	*
1243	* Note that we do not support mappings at the very end of the
1244	* address space since that will break our GCPtrEnd assumptions.
1245	* Nor do we support mappings crossing page directories.
1246	*/
1247	const unsigned cPTs = pMapping->cb >> X86_PD_PAE_SHIFT;
1248	unsigned iPDNew = RT_ELEMENTS(pPDSrc->a) - cPTs; /* (+ 1 - 1) */
1249
1250	while (iPDNew-- > 0)
1251	{
1252	/* Ugly assumption that mappings start on a 4 MB boundary. */
1253	if (iPDNew & 1)
1254	continue;
1255
1256	if (pgmR3MapIsKnownConflictAddress(pMapping, ((RTGCPTR32)iPDPTE << X86_PDPT_SHIFT) + (iPDNew << X86_PD_PAE_SHIFT)))
1257	continue;
1258
1259	if (pPDSrc)
1260	{
1261	if (pPDSrc->a[iPDNew].n.u1Present)
1262	continue;
1263	if (cPTs > 1)
1264	{
1265	bool fOk = true;
1266	for (unsigned i = 1; fOk && i < cPTs; i++)
1267	if (pPDSrc->a[iPDNew + i].n.u1Present)
1268	fOk = false;
1269	if (!fOk)
1270	continue;
1271	}
1272	}
1273	/*
1274	* Check that it's not conflicting with an intermediate page table mapping.
1275	*/
1276	bool fOk = true;
1277	unsigned i = cPTs;
1278	while (fOk && i-- > 0)
1279	fOk = !pVM->pgm.s.apInterPaePDs[iPDPTE]->a[iPDNew + i].n.u1Present;
1280	if (!fOk)
1281	continue;
1282
1283	/*
1284	* Ask for the mapping.
1285	*/
1286	RTGCPTR GCPtrNewMapping = ((RTGCPTR32)iPDPTE << X86_PDPT_SHIFT) + (iPDNew << X86_PD_PAE_SHIFT);
1287
1288	if (pMapping->pfnRelocate(pVM, GCPtrOldMapping, GCPtrNewMapping, PGMRELOCATECALL_SUGGEST, pMapping->pvUser))
1289	{
1290	pgmR3MapRelocate(pVM, pMapping, GCPtrOldMapping, GCPtrNewMapping);
1291	STAM_PROFILE_STOP(&pVM->pgm.s.StatR3ResolveConflict, a);
1292	return VINF_SUCCESS;
1293	}
1294	}
1295	}
1296	STAM_PROFILE_STOP(&pVM->pgm.s.StatR3ResolveConflict, a);
1297	AssertMsgFailed(("Failed to relocate page table mapping '%s' from %#x! (cPTs=%d)\n", pMapping->pszDesc, GCPtrOldMapping, pMapping->cb >> X86_PD_PAE_SHIFT));
1298	return VERR_PGM_NO_HYPERVISOR_ADDRESS;
1299	}
1300
1301
1302	/**
1303	* Read memory from the guest mappings.
1304	*
1305	* This will use the page tables associated with the mappings to
1306	* read the memory. This means that not all kind of memory is readable
1307	* since we don't necessarily know how to convert that physical address
1308	* to a HC virtual one.
1309	*
1310	* @returns VBox status.
1311	* @param pVM VM handle.
1312	* @param pvDst The destination address (HC of course).
1313	* @param GCPtrSrc The source address (GC virtual address).
1314	* @param cb Number of bytes to read.
1315	*
1316	* @remarks The is indirectly for DBGF only.
1317	* @todo Consider renaming it to indicate it's special usage, or just
1318	* reimplement it in MMR3HyperReadGCVirt.
1319	*/
1320	VMMR3DECL(int) PGMR3MapRead(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
1321	{
1322	/*
1323	* Simplicity over speed... Chop the request up into chunks
1324	* which don't cross pages.
1325	*/
1326	if (cb + (GCPtrSrc & PAGE_OFFSET_MASK) > PAGE_SIZE)
1327	{
1328	for (;;)
1329	{
1330	size_t cbRead = RT_MIN(cb, PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK));
1331	int rc = PGMR3MapRead(pVM, pvDst, GCPtrSrc, cbRead);
1332	if (RT_FAILURE(rc))
1333	return rc;
1334	cb -= cbRead;
1335	if (!cb)
1336	break;
1337	pvDst = (char *)pvDst + cbRead;
1338	GCPtrSrc += cbRead;
1339	}
1340	return VINF_SUCCESS;
1341	}
1342
1343	/*
1344	* Find the mapping.
1345	*/
1346	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
1347	while (pCur)
1348	{
1349	RTGCPTR off = GCPtrSrc - pCur->GCPtr;
1350	if (off < pCur->cb)
1351	{
1352	if (off + cb > pCur->cb)
1353	{
1354	AssertMsgFailed(("Invalid page range %RGv LB%#x. mapping '%s' %RGv to %RGv\n",
1355	GCPtrSrc, cb, pCur->pszDesc, pCur->GCPtr, pCur->GCPtrLast));
1356	return VERR_INVALID_PARAMETER;
1357	}
1358
1359	unsigned iPT = off >> X86_PD_SHIFT;
1360	unsigned iPTE = (off >> PAGE_SHIFT) & X86_PT_MASK;
1361	while (cb > 0 && iPTE < RT_ELEMENTS(CTXALLSUFF(pCur->aPTs[iPT].pPT)->a))
1362	{
1363	if (!CTXALLSUFF(pCur->aPTs[iPT].paPaePTs)[iPTE / 512].a[iPTE % 512].n.u1Present)
1364	return VERR_PAGE_NOT_PRESENT;
1365	RTHCPHYS HCPhys = CTXALLSUFF(pCur->aPTs[iPT].paPaePTs)[iPTE / 512].a[iPTE % 512].u & X86_PTE_PAE_PG_MASK;
1366
1367	/*
1368	* Get the virtual page from the physical one.
1369	*/
1370	void *pvPage;
1371	int rc = MMR3HCPhys2HCVirt(pVM, HCPhys, &pvPage);
1372	if (RT_FAILURE(rc))
1373	return rc;
1374
1375	memcpy(pvDst, (char *)pvPage + (GCPtrSrc & PAGE_OFFSET_MASK), cb);
1376	return VINF_SUCCESS;
1377	}
1378	}
1379
1380	/* next */
1381	pCur = CTXALLSUFF(pCur->pNext);
1382	}
1383
1384	return VERR_INVALID_POINTER;
1385	}
1386
1387
1388	/**
1389	* Info callback for 'pgmhandlers'.
1390	*
1391	* @param pHlp The output helpers.
1392	* @param pszArgs The arguments. phys or virt.
1393	*/
1394	DECLCALLBACK(void) pgmR3MapInfo(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
1395	{
1396	pHlp->pfnPrintf(pHlp, pVM->pgm.s.fMappingsFixed
1397	? "\nThe mappings are FIXED.\n"
1398	: "\nThe mappings are FLOATING.\n");
1399	PPGMMAPPING pCur;
1400	for (pCur = pVM->pgm.s.pMappingsR3; pCur; pCur = pCur->pNextR3)
1401	pHlp->pfnPrintf(pHlp, "%RGv - %RGv %s\n", pCur->GCPtr, pCur->GCPtrLast, pCur->pszDesc);
1402	}
1403

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source: vbox/trunk/src/VBox/VMM/PGMMap.cpp@ 19167

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