PGMAllMap.cpp@ 34147

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1	/* $Id: PGMAllMap.cpp 33540 2010-10-28 09:27:05Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor - All context code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_PGM
22	#include <VBox/pgm.h>
23	#include "../PGMInternal.h"
24	#include <VBox/vm.h>
25	#include "../PGMInline.h"
26	#include <VBox/err.h>
27	#include <iprt/asm-amd64-x86.h>
28	#include <iprt/assert.h>
29
30
31	/**
32	* Maps a range of physical pages at a given virtual address
33	* in the guest context.
34	*
35	* The GC virtual address range must be within an existing mapping.
36	*
37	* @returns VBox status code.
38	* @param pVM The virtual machine.
39	* @param GCPtr Where to map the page(s). Must be page aligned.
40	* @param HCPhys Start of the range of physical pages. Must be page aligned.
41	* @param cbPages Number of bytes to map. Must be page aligned.
42	* @param fFlags Page flags (X86_PTE_*).
43	*/
44	VMMDECL(int) PGMMap(PVM pVM, RTGCUINTPTR GCPtr, RTHCPHYS HCPhys, uint32_t cbPages, unsigned fFlags)
45	{
46	AssertMsg(pVM->pgm.s.offVM, ("Bad init order\n"));
47
48	/*
49	* Validate input.
50	*/
51	AssertMsg(RT_ALIGN_T(GCPtr, PAGE_SIZE, RTGCUINTPTR) == GCPtr, ("Invalid alignment GCPtr=%#x\n", GCPtr));
52	AssertMsg(cbPages > 0 && RT_ALIGN_32(cbPages, PAGE_SIZE) == cbPages, ("Invalid cbPages=%#x\n", cbPages));
53	AssertMsg(!(fFlags & X86_PDE_PG_MASK), ("Invalid flags %#x\n", fFlags));
54
55	/* hypervisor defaults */
56	if (!fFlags)
57	fFlags = X86_PTE_P \| X86_PTE_A \| X86_PTE_D;
58
59	/*
60	* Find the mapping.
61	*/
62	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
63	while (pCur)
64	{
65	if (GCPtr - pCur->GCPtr < pCur->cb)
66	{
67	if (GCPtr + cbPages - 1 > pCur->GCPtrLast)
68	{
69	AssertMsgFailed(("Invalid range!!\n"));
70	return VERR_INVALID_PARAMETER;
71	}
72
73	/*
74	* Setup PTE.
75	*/
76	X86PTEPAE Pte;
77	Pte.u = fFlags \| (HCPhys & X86_PTE_PAE_PG_MASK);
78
79	/*
80	* Update the page tables.
81	*/
82	for (;;)
83	{
84	RTGCUINTPTR off = GCPtr - pCur->GCPtr;
85	const unsigned iPT = off >> X86_PD_SHIFT;
86	const unsigned iPageNo = (off >> PAGE_SHIFT) & X86_PT_MASK;
87
88	/* 32-bit */
89	pCur->aPTs[iPT].CTX_SUFF(pPT)->a[iPageNo].u = (uint32_t)Pte.u; /* ASSUMES HCPhys < 4GB and/or that we're never gonna do 32-bit on a PAE host! */
90
91	/* pae */
92	PGMSHWPTEPAE_SET(pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPageNo / 512].a[iPageNo % 512], Pte.u);
93
94	/* next */
95	cbPages -= PAGE_SIZE;
96	if (!cbPages)
97	break;
98	GCPtr += PAGE_SIZE;
99	Pte.u += PAGE_SIZE;
100	}
101
102	return VINF_SUCCESS;
103	}
104
105	/* next */
106	pCur = pCur->CTX_SUFF(pNext);
107	}
108
109	AssertMsgFailed(("GCPtr=%#x was not found in any mapping ranges!\n", GCPtr));
110	return VERR_INVALID_PARAMETER;
111	}
112
113
114	/**
115	* Sets (replaces) the page flags for a range of pages in a mapping.
116	*
117	* @returns VBox status.
118	* @param pVM VM handle.
119	* @param GCPtr Virtual address of the first page in the range.
120	* @param cb Size (in bytes) of the range to apply the modification to.
121	* @param fFlags Page flags X86_PTE_*, excluding the page mask of course.
122	*/
123	VMMDECL(int) PGMMapSetPage(PVM pVM, RTGCPTR GCPtr, uint64_t cb, uint64_t fFlags)
124	{
125	return PGMMapModifyPage(pVM, GCPtr, cb, fFlags, 0);
126	}
127
128
129	/**
130	* Modify page flags for a range of pages in a mapping.
131	*
132	* The existing flags are ANDed with the fMask and ORed with the fFlags.
133	*
134	* @returns VBox status code.
135	* @param pVM VM handle.
136	* @param GCPtr Virtual address of the first page in the range.
137	* @param cb Size (in bytes) of the range to apply the modification to.
138	* @param fFlags The OR mask - page flags X86_PTE_*, excluding the page mask of course.
139	* @param fMask The AND mask - page flags X86_PTE_*, excluding the page mask of course.
140	*/
141	VMMDECL(int) PGMMapModifyPage(PVM pVM, RTGCPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask)
142	{
143	/*
144	* Validate input.
145	*/
146	AssertMsg(!(fFlags & (X86_PTE_PAE_PG_MASK \| X86_PTE_PAE_MBZ_MASK_NX)), ("fFlags=%#x\n", fFlags));
147	Assert(cb);
148
149	/*
150	* Align the input.
151	*/
152	cb += (RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK;
153	cb = RT_ALIGN_Z(cb, PAGE_SIZE);
154	GCPtr = (RTGCPTR)((RTGCUINTPTR)GCPtr & PAGE_BASE_GC_MASK);
155
156	/*
157	* Find the mapping.
158	*/
159	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
160	while (pCur)
161	{
162	RTGCUINTPTR off = (RTGCUINTPTR)GCPtr - (RTGCUINTPTR)pCur->GCPtr;
163	if (off < pCur->cb)
164	{
165	AssertMsgReturn(off + cb <= pCur->cb,
166	("Invalid page range %#x LB%#x. mapping '%s' %#x to %#x\n",
167	GCPtr, cb, pCur->pszDesc, pCur->GCPtr, pCur->GCPtrLast),
168	VERR_INVALID_PARAMETER);
169
170	/*
171	* Perform the requested operation.
172	*/
173	while (cb > 0)
174	{
175	unsigned iPT = off >> X86_PD_SHIFT;
176	unsigned iPTE = (off >> PAGE_SHIFT) & X86_PT_MASK;
177	while (cb > 0 && iPTE < RT_ELEMENTS(pCur->aPTs[iPT].CTX_SUFF(pPT)->a))
178	{
179	/* 32-Bit */
180	pCur->aPTs[iPT].CTX_SUFF(pPT)->a[iPTE].u &= fMask \| X86_PTE_PG_MASK;
181	pCur->aPTs[iPT].CTX_SUFF(pPT)->a[iPTE].u \|= fFlags & ~X86_PTE_PG_MASK;
182
183	/* PAE */
184	PPGMSHWPTEPAE pPtePae = &pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPTE / 512].a[iPTE % 512];
185	PGMSHWPTEPAE_SET(*pPtePae,
186	( PGMSHWPTEPAE_GET_U(*pPtePae)
187	& (fMask \| X86_PTE_PAE_PG_MASK))
188	\| (fFlags & ~(X86_PTE_PAE_PG_MASK \| X86_PTE_PAE_MBZ_MASK_NX)));
189
190	/* invalidate tls */
191	PGM_INVL_PG(VMMGetCpu(pVM), (RTGCUINTPTR)pCur->GCPtr + off);
192
193	/* next */
194	iPTE++;
195	cb -= PAGE_SIZE;
196	off += PAGE_SIZE;
197	}
198	}
199
200	return VINF_SUCCESS;
201	}
202	/* next */
203	pCur = pCur->CTX_SUFF(pNext);
204	}
205
206	AssertMsgFailed(("Page range %#x LB%#x not found\n", GCPtr, cb));
207	return VERR_INVALID_PARAMETER;
208	}
209
210
211	/**
212	* Get information about a page in a mapping.
213	*
214	* This differs from PGMShwGetPage and PGMGstGetPage in that it only consults
215	* the page table to calculate the flags.
216	*
217	* @returns VINF_SUCCESS, VERR_PAGE_NOT_PRESENT or VERR_NOT_FOUND.
218	* @param pVM The VM handle.
219	* @param GCPtr The page address.
220	* @param pfFlags Where to return the flags. Optional.
221	* @param pHCPhys Where to return the address. Optional.
222	*/
223	VMMDECL(int) PGMMapGetPage(PVM pVM, RTGCPTR GCPtr, uint64_t *pfFlags, PRTHCPHYS pHCPhys)
224	{
225	/*
226	* Find the mapping.
227	*/
228	GCPtr &= PAGE_BASE_GC_MASK;
229	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
230	while (pCur)
231	{
232	RTGCUINTPTR off = (RTGCUINTPTR)GCPtr - (RTGCUINTPTR)pCur->GCPtr;
233	if (off < pCur->cb)
234	{
235	/*
236	* Dig out the information.
237	*/
238	int rc = VINF_SUCCESS;
239	unsigned iPT = off >> X86_PD_SHIFT;
240	unsigned iPTE = (off >> PAGE_SHIFT) & X86_PT_MASK;
241	PCPGMSHWPTEPAE pPtePae = &pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPTE / 512].a[iPTE % 512];
242	if (PGMSHWPTEPAE_IS_P(*pPtePae))
243	{
244	if (pfFlags)
245	pfFlags = PGMSHWPTEPAE_GET_U(pPtePae) & ~X86_PTE_PAE_PG_MASK;
246	if (pHCPhys)
247	pHCPhys = PGMSHWPTEPAE_GET_HCPHYS(pPtePae);
248	}
249	else
250	rc = VERR_PAGE_NOT_PRESENT;
251	return rc;
252	}
253	/* next */
254	pCur = pCur->CTX_SUFF(pNext);
255	}
256
257	return VERR_NOT_FOUND;
258	}
259
260
261
262	#ifndef IN_RING0
263	/**
264	* Sets all PDEs involved with the mapping in the shadow page table.
265	*
266	* @param pVM The VM handle.
267	* @param pMap Pointer to the mapping in question.
268	* @param iNewPDE The index of the 32-bit PDE corresponding to the base of the mapping.
269	*/
270	void pgmMapSetShadowPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iNewPDE)
271	{
272	Log4(("pgmMapSetShadowPDEs new pde %x (mappings enabled %d)\n", iNewPDE, pgmMapAreMappingsEnabled(&pVM->pgm.s)));
273
274	if ( !pgmMapAreMappingsEnabled(&pVM->pgm.s)
275	\|\| pVM->cCpus > 1)
276	return;
277
278	/* This only applies to raw mode where we only support 1 VCPU. */
279	PVMCPU pVCpu = VMMGetCpu0(pVM);
280	if (!pVCpu->pgm.s.CTX_SUFF(pShwPageCR3))
281	return; /* too early */
282
283	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
284	Assert(enmShadowMode <= PGMMODE_PAE_NX);
285
286	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
287
288	/*
289	* Insert the page tables into the shadow page directories.
290	*/
291	unsigned i = pMap->cPTs;
292	iNewPDE += i;
293	while (i-- > 0)
294	{
295	iNewPDE--;
296
297	switch (enmShadowMode)
298	{
299	case PGMMODE_32_BIT:
300	{
301	PX86PD pShw32BitPd = pgmShwGet32BitPDPtr(pVCpu);
302	AssertFatal(pShw32BitPd);
303
304	/* Free any previous user, unless it's us. */
305	Assert( (pShw32BitPd->a[iNewPDE].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
306	\|\| (pShw32BitPd->a[iNewPDE].u & X86_PDE_PG_MASK) == pMap->aPTs[i].HCPhysPT);
307	if ( pShw32BitPd->a[iNewPDE].n.u1Present
308	&& !(pShw32BitPd->a[iNewPDE].u & PGM_PDFLAGS_MAPPING))
309	pgmPoolFree(pVM, pShw32BitPd->a[iNewPDE].u & X86_PDE_PG_MASK, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3)->idx, iNewPDE);
310
311	/* Default mapping page directory flags are read/write and supervisor; individual page attributes determine the final flags. */
312	pShw32BitPd->a[iNewPDE].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
313	\| (uint32_t)pMap->aPTs[i].HCPhysPT;
314	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShw32BitPd);
315	break;
316	}
317
318	case PGMMODE_PAE:
319	case PGMMODE_PAE_NX:
320	{
321	const uint32_t iPdPt = iNewPDE / 256;
322	unsigned iPaePde = iNewPDE * 2 % 512;
323	PX86PDPT pShwPdpt = pgmShwGetPaePDPTPtr(pVCpu);
324	Assert(pShwPdpt);
325
326	/*
327	* Get the shadow PD.
328	* If no PD, sync it (PAE guest) or fake (not present or 32-bit guest).
329	* Note! The RW, US and A bits are reserved for PAE PDPTEs. Setting the
330	* accessed bit causes invalid VT-x guest state errors.
331	*/
332	PX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, iPdPt << X86_PDPT_SHIFT);
333	if (!pShwPaePd)
334	{
335	X86PDPE GstPdpe;
336	if (PGMGetGuestMode(pVCpu) < PGMMODE_PAE)
337	GstPdpe.u = X86_PDPE_P;
338	else
339	{
340	PX86PDPE pGstPdpe = pgmGstGetPaePDPEPtr(pVCpu, iPdPt << X86_PDPT_SHIFT);
341	if (pGstPdpe)
342	GstPdpe = *pGstPdpe;
343	else
344	GstPdpe.u = X86_PDPE_P;
345	}
346	int rc = pgmShwSyncPaePDPtr(pVCpu, iPdPt << X86_PDPT_SHIFT, GstPdpe.u, &pShwPaePd);
347	AssertFatalRC(rc);
348	}
349	Assert(pShwPaePd);
350
351	/*
352	* Mark the page as locked; disallow flushing.
353	*/
354	PPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdPt].u & X86_PDPE_PG_MASK);
355	AssertFatal(pPoolPagePd);
356	if (!pgmPoolIsPageLocked(&pVM->pgm.s, pPoolPagePd))
357	pgmPoolLockPage(pPool, pPoolPagePd);
358	#ifdef VBOX_STRICT
359	else if (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING)
360	{
361	Assert(PGMGetGuestMode(pVCpu) >= PGMMODE_PAE); /** @todo We may hit this during reset, will fix later. */
362	AssertFatalMsg( (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT0
363	\|\| !PGMMODE_WITH_PAGING(PGMGetGuestMode(pVCpu)),
364	("%RX64 vs %RX64\n", pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK, pMap->aPTs[i].HCPhysPaePT0));
365	Assert(pShwPaePd->a[iPaePde+1].u & PGM_PDFLAGS_MAPPING);
366	AssertFatalMsg( (pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT1
367	\|\| !PGMMODE_WITH_PAGING(PGMGetGuestMode(pVCpu)),
368	("%RX64 vs %RX64\n", pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK, pMap->aPTs[i].HCPhysPaePT1));
369	}
370	#endif
371
372	/*
373	* Insert our first PT, freeing anything we might be replacing unless it's a mapping (i.e. us).
374	*/
375	Assert( (pShwPaePd->a[iPaePde].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
376	\|\| (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT0);
377	if ( pShwPaePd->a[iPaePde].n.u1Present
378	&& !(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING))
379	{
380	Assert(!(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
381	pgmPoolFree(pVM, pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK, pPoolPagePd->idx, iPaePde);
382	}
383	pShwPaePd->a[iPaePde].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
384	\| pMap->aPTs[i].HCPhysPaePT0;
385
386	/* 2nd 2 MB PDE of the 4 MB region, same as above. */
387	iPaePde++;
388	AssertFatal(iPaePde < 512);
389	Assert( (pShwPaePd->a[iPaePde].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
390	\|\| (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT1);
391	if ( pShwPaePd->a[iPaePde].n.u1Present
392	&& !(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING))
393	pgmPoolFree(pVM, pShwPaePd->a[iPaePde].u & X86_PDE_PG_MASK, pPoolPagePd->idx, iPaePde);
394	pShwPaePd->a[iPaePde].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
395	\| pMap->aPTs[i].HCPhysPaePT1;
396
397	/*
398	* Set the PGM_PDFLAGS_MAPPING flag in the page directory pointer entry. (legacy PAE guest mode)
399	*/
400	pShwPdpt->a[iPdPt].u \|= PGM_PLXFLAGS_MAPPING;
401
402	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPaePd);
403	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPdpt);
404	break;
405	}
406
407	default:
408	AssertFailed();
409	break;
410	}
411	}
412	}
413
414
415	/**
416	* Clears all PDEs involved with the mapping in the shadow page table.
417	*
418	* @param pVM The VM handle.
419	* @param pShwPageCR3 CR3 root page
420	* @param pMap Pointer to the mapping in question.
421	* @param iOldPDE The index of the 32-bit PDE corresponding to the base of the mapping.
422	* @param fDeactivateCR3 Set if it's pgmMapDeactivateCR3 calling.
423	*/
424	void pgmMapClearShadowPDEs(PVM pVM, PPGMPOOLPAGE pShwPageCR3, PPGMMAPPING pMap, unsigned iOldPDE, bool fDeactivateCR3)
425	{
426	Log(("pgmMapClearShadowPDEs: old pde %x (cPTs=%x) (mappings enabled %d) fDeactivateCR3=%RTbool\n", iOldPDE, pMap->cPTs, pgmMapAreMappingsEnabled(&pVM->pgm.s), fDeactivateCR3));
427
428	/*
429	* Skip this if disabled or if it doesn't apply.
430	*/
431	if ( !pgmMapAreMappingsEnabled(&pVM->pgm.s)
432	\|\| pVM->cCpus > 1)
433	return;
434
435	Assert(pShwPageCR3);
436
437	/* This only applies to raw mode where we only support 1 VCPU. */
438	PVMCPU pVCpu = VMMGetCpu0(pVM);
439	# ifdef IN_RC
440	Assert(pShwPageCR3 != pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
441	# endif
442
443	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
444
445	PX86PDPT pCurrentShwPdpt = NULL;
446	if ( PGMGetGuestMode(pVCpu) >= PGMMODE_PAE
447	&& pShwPageCR3 != pVCpu->pgm.s.CTX_SUFF(pShwPageCR3))
448	pCurrentShwPdpt = pgmShwGetPaePDPTPtr(pVCpu);
449
450	unsigned i = pMap->cPTs;
451	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
452
453	iOldPDE += i;
454	while (i-- > 0)
455	{
456	iOldPDE--;
457
458	switch(enmShadowMode)
459	{
460	case PGMMODE_32_BIT:
461	{
462	PX86PD pShw32BitPd = (PX86PD)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
463	AssertFatal(pShw32BitPd);
464
465	Assert(!pShw32BitPd->a[iOldPDE].n.u1Present \|\| (pShw32BitPd->a[iOldPDE].u & PGM_PDFLAGS_MAPPING));
466	pShw32BitPd->a[iOldPDE].u = 0;
467	break;
468	}
469
470	case PGMMODE_PAE:
471	case PGMMODE_PAE_NX:
472	{
473	const unsigned iPdpt = iOldPDE / 256; /* iOldPDE * 2 / 512; iOldPDE is in 4 MB pages */
474	unsigned iPaePde = iOldPDE * 2 % 512;
475	PX86PDPT pShwPdpt = (PX86PDPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
476	PX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, pShwPdpt, (iPdpt << X86_PDPT_SHIFT));
477
478	/*
479	* Clear the PGM_PDFLAGS_MAPPING flag for the page directory pointer entry. (legacy PAE guest mode)
480	*/
481	if (fDeactivateCR3)
482	pShwPdpt->a[iPdpt].u &= ~PGM_PLXFLAGS_MAPPING;
483	else if (pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING)
484	{
485	/* See if there are any other mappings here. This is suboptimal code. */
486	pShwPdpt->a[iPdpt].u &= ~PGM_PLXFLAGS_MAPPING;
487	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
488	if ( pCur != pMap
489	&& ( (pCur->GCPtr >> X86_PDPT_SHIFT) == iPdpt
490	\|\| (pCur->GCPtrLast >> X86_PDPT_SHIFT) == iPdpt))
491	{
492	pShwPdpt->a[iPdpt].u \|= PGM_PLXFLAGS_MAPPING;
493	break;
494	}
495	}
496
497	/*
498	* If the page directory of the old CR3 is reused in the new one, then don't
499	* clear the hypervisor mappings.
500	*/
501	if ( pCurrentShwPdpt
502	&& (pCurrentShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK) == (pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK) )
503	{
504	LogFlow(("pgmMapClearShadowPDEs: Pdpe %d reused -> don't clear hypervisor mappings!\n", iPdpt));
505	break;
506	}
507
508	/*
509	* Clear the mappings in the PD.
510	*/
511	AssertFatal(pShwPaePd);
512	Assert(!pShwPaePd->a[iPaePde].n.u1Present \|\| (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
513	pShwPaePd->a[iPaePde].u = 0;
514
515	iPaePde++;
516	AssertFatal(iPaePde < 512);
517	Assert(!pShwPaePd->a[iPaePde].n.u1Present \|\| (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
518	pShwPaePd->a[iPaePde].u = 0;
519
520	/*
521	* Unlock the shadow pool PD page if the PDPTE no longer holds any mappings.
522	*/
523	if ( fDeactivateCR3
524	\|\| !(pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING))
525	{
526	PPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK);
527	AssertFatal(pPoolPagePd);
528	if (pgmPoolIsPageLocked(&pVM->pgm.s, pPoolPagePd))
529	pgmPoolUnlockPage(pPool, pPoolPagePd);
530	}
531	break;
532	}
533
534	default:
535	AssertFailed();
536	break;
537	}
538	}
539
540	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pCurrentShwPdpt);
541	}
542	#endif /* !IN_RING0 */
543
544	#if defined(VBOX_STRICT) && !defined(IN_RING0)
545	/**
546	* Clears all PDEs involved with the mapping in the shadow page table.
547	*
548	* @param pVM The VM handle.
549	* @param pVCpu The VMCPU handle.
550	* @param pShwPageCR3 CR3 root page
551	* @param pMap Pointer to the mapping in question.
552	* @param iPDE The index of the 32-bit PDE corresponding to the base of the mapping.
553	*/
554	static void pgmMapCheckShadowPDEs(PVM pVM, PVMCPU pVCpu, PPGMPOOLPAGE pShwPageCR3, PPGMMAPPING pMap, unsigned iPDE)
555	{
556	Assert(pShwPageCR3);
557
558	uint32_t i = pMap->cPTs;
559	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
560	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
561
562	iPDE += i;
563	while (i-- > 0)
564	{
565	iPDE--;
566
567	switch (enmShadowMode)
568	{
569	case PGMMODE_32_BIT:
570	{
571	PCX86PD pShw32BitPd = (PCX86PD)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
572	AssertFatal(pShw32BitPd);
573
574	AssertMsg(pShw32BitPd->a[iPDE].u == (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| (uint32_t)pMap->aPTs[i].HCPhysPT),
575	("Expected %x vs %x; iPDE=%#x %RGv %s\n",
576	pShw32BitPd->a[iPDE].u, (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| (uint32_t)pMap->aPTs[i].HCPhysPT),
577	iPDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
578	break;
579	}
580
581	case PGMMODE_PAE:
582	case PGMMODE_PAE_NX:
583	{
584	const unsigned iPdpt = iPDE / 256; /* iPDE * 2 / 512; iPDE is in 4 MB pages */
585	unsigned iPaePDE = iPDE * 2 % 512;
586	PX86PDPT pShwPdpt = (PX86PDPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
587	PCX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, pShwPdpt, iPdpt << X86_PDPT_SHIFT);
588	AssertFatal(pShwPaePd);
589
590	AssertMsg(pShwPaePd->a[iPaePDE].u == (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT0),
591	("Expected %RX64 vs %RX64; iPDE=%#x iPdpt=%#x iPaePDE=%#x %RGv %s\n",
592	pShwPaePd->a[iPaePDE].u, (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT0),
593	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
594
595	iPaePDE++;
596	AssertFatal(iPaePDE < 512);
597
598	AssertMsg(pShwPaePd->a[iPaePDE].u == (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT1),
599	("Expected %RX64 vs %RX64; iPDE=%#x iPdpt=%#x iPaePDE=%#x %RGv %s\n",
600	pShwPaePd->a[iPaePDE].u, (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT1),
601	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
602
603	AssertMsg(pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING,
604	("%RX64; iPdpt=%#x iPDE=%#x iPaePDE=%#x %RGv %s\n",
605	pShwPdpt->a[iPdpt].u,
606	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
607
608	PCPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK);
609	AssertFatal(pPoolPagePd);
610	AssertMsg(pPoolPagePd->cLocked, (".idx=%d .type=%d\n", pPoolPagePd->idx, pPoolPagePd->enmKind));
611	break;
612	}
613
614	default:
615	AssertFailed();
616	break;
617	}
618	}
619	}
620
621
622	/**
623	* Check the hypervisor mappings in the active CR3.
624	*
625	* @param pVM The virtual machine.
626	*/
627	VMMDECL(void) PGMMapCheck(PVM pVM)
628	{
629	/*
630	* Can skip this if mappings are disabled.
631	*/
632	if (!pgmMapAreMappingsEnabled(&pVM->pgm.s))
633	return;
634
635	/* This only applies to raw mode where we only support 1 VCPU. */
636	Assert(pVM->cCpus == 1);
637	PVMCPU pVCpu = VMMGetCpu0(pVM);
638	Assert(pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
639
640	/*
641	* Iterate mappings.
642	*/
643	pgmLock(pVM); /* to avoid assertions */
644	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
645	{
646	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
647	pgmMapCheckShadowPDEs(pVM, pVCpu, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3), pCur, iPDE);
648	}
649	pgmUnlock(pVM);
650	}
651	#endif /* defined(VBOX_STRICT) && !defined(IN_RING0) */
652
653	#ifndef IN_RING0
654
655	/**
656	* Apply the hypervisor mappings to the active CR3.
657	*
658	* @returns VBox status.
659	* @param pVM The virtual machine.
660	* @param pShwPageCR3 CR3 root page
661	*/
662	int pgmMapActivateCR3(PVM pVM, PPGMPOOLPAGE pShwPageCR3)
663	{
664	/*
665	* Skip this if disabled or if it doesn't apply.
666	*/
667	if ( !pgmMapAreMappingsEnabled(&pVM->pgm.s)
668	\|\| pVM->cCpus > 1)
669	return VINF_SUCCESS;
670
671	/* Note! This might not be logged successfully in RC because we usually
672	cannot flush the log at this point. */
673	Log4(("pgmMapActivateCR3: fixed mappings=%RTbool idxShwPageCR3=%#x\n", pVM->pgm.s.fMappingsFixed, pShwPageCR3 ? pShwPageCR3->idx : NIL_PGMPOOL_IDX));
674
675	#ifdef VBOX_STRICT
676	PVMCPU pVCpu = VMMGetCpu0(pVM);
677	Assert(pShwPageCR3 && pShwPageCR3 == pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
678	#endif
679
680	/*
681	* Iterate mappings.
682	*/
683	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
684	{
685	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
686	pgmMapSetShadowPDEs(pVM, pCur, iPDE);
687	}
688	return VINF_SUCCESS;
689	}
690
691
692	/**
693	* Remove the hypervisor mappings from the specified CR3
694	*
695	* @returns VBox status.
696	* @param pVM The virtual machine.
697	* @param pShwPageCR3 CR3 root page
698	*/
699	int pgmMapDeactivateCR3(PVM pVM, PPGMPOOLPAGE pShwPageCR3)
700	{
701	/*
702	* Skip this if disabled or if it doesn't apply.
703	*/
704	if ( !pgmMapAreMappingsEnabled(&pVM->pgm.s)
705	\|\| pVM->cCpus > 1)
706	return VINF_SUCCESS;
707
708	Assert(pShwPageCR3);
709	Log4(("pgmMapDeactivateCR3: fixed mappings=%d idxShwPageCR3=%#x\n", pVM->pgm.s.fMappingsFixed, pShwPageCR3 ? pShwPageCR3->idx : NIL_PGMPOOL_IDX));
710
711	/*
712	* Iterate mappings.
713	*/
714	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
715	{
716	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
717	pgmMapClearShadowPDEs(pVM, pShwPageCR3, pCur, iPDE, true /fDeactivateCR3/);
718	}
719	return VINF_SUCCESS;
720	}
721
722
723	/**
724	* Checks guest PD for conflicts with VMM GC mappings.
725	*
726	* @returns true if conflict detected.
727	* @returns false if not.
728	* @param pVM The virtual machine.
729	*/
730	VMMDECL(bool) PGMMapHasConflicts(PVM pVM)
731	{
732	/*
733	* Can skip this if mappings are safely fixed.
734	*/
735	if (!pgmMapAreMappingsFloating(&pVM->pgm.s))
736	return false;
737
738	Assert(pVM->cCpus == 1);
739
740	/* This only applies to raw mode where we only support 1 VCPU. */
741	PVMCPU pVCpu = &pVM->aCpus[0];
742
743	PGMMODE const enmGuestMode = PGMGetGuestMode(pVCpu);
744	Assert(enmGuestMode <= PGMMODE_PAE_NX);
745
746	/*
747	* Iterate mappings.
748	*/
749	if (enmGuestMode == PGMMODE_32_BIT)
750	{
751	/*
752	* Resolve the page directory.
753	*/
754	PX86PD pPD = pgmGstGet32bitPDPtr(pVCpu);
755	Assert(pPD);
756
757	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
758	{
759	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
760	unsigned iPT = pCur->cPTs;
761	while (iPT-- > 0)
762	if ( pPD->a[iPDE + iPT].n.u1Present /** @todo PGMGstGetPDE. */
763	&& (pVM->fRawR0Enabled \|\| pPD->a[iPDE + iPT].n.u1User))
764	{
765	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
766
767	#ifdef IN_RING3
768	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping %s (32 bits)\n"
769	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
770	(iPT + iPDE) << X86_PD_SHIFT, pCur->pszDesc,
771	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
772	#else
773	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping (32 bits)\n"
774	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
775	(iPT + iPDE) << X86_PD_SHIFT,
776	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
777	#endif
778	return true;
779	}
780	}
781	}
782	else if ( enmGuestMode == PGMMODE_PAE
783	\|\| enmGuestMode == PGMMODE_PAE_NX)
784	{
785	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
786	{
787	RTGCPTR GCPtr = pCur->GCPtr;
788
789	unsigned iPT = pCur->cb >> X86_PD_PAE_SHIFT;
790	while (iPT-- > 0)
791	{
792	X86PDEPAE Pde = pgmGstGetPaePDE(pVCpu, GCPtr);
793
794	if ( Pde.n.u1Present
795	&& (pVM->fRawR0Enabled \|\| Pde.n.u1User))
796	{
797	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
798	#ifdef IN_RING3
799	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping %s (PAE)\n"
800	" PDE=%016RX64.\n",
801	GCPtr, pCur->pszDesc, Pde.u));
802	#else
803	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping (PAE)\n"
804	" PDE=%016RX64.\n",
805	GCPtr, Pde.u));
806	#endif
807	return true;
808	}
809	GCPtr += (1 << X86_PD_PAE_SHIFT);
810	}
811	}
812	}
813	else
814	AssertFailed();
815
816	return false;
817	}
818
819
820	/**
821	* Checks and resolves (ring 3 only) guest conflicts with the guest mappings.
822	*
823	* @returns VBox status.
824	* @param pVM The virtual machine.
825	*/
826	int pgmMapResolveConflicts(PVM pVM)
827	{
828	/* The caller is expected to check these two conditions. */
829	Assert(!pVM->pgm.s.fMappingsFixed);
830	Assert(!pVM->pgm.s.fMappingsDisabled);
831
832	/* This only applies to raw mode where we only support 1 VCPU. */
833	Assert(pVM->cCpus == 1);
834	PVMCPU pVCpu = &pVM->aCpus[0];
835	PGMMODE const enmGuestMode = PGMGetGuestMode(pVCpu);
836	Assert(enmGuestMode <= PGMMODE_PAE_NX);
837
838	if (enmGuestMode == PGMMODE_32_BIT)
839	{
840	/*
841	* Resolve the page directory.
842	*/
843	PX86PD pPD = pgmGstGet32bitPDPtr(pVCpu);
844	Assert(pPD);
845
846	/*
847	* Iterate mappings.
848	*/
849	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; )
850	{
851	PPGMMAPPING pNext = pCur->CTX_SUFF(pNext);
852	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
853	unsigned iPT = pCur->cPTs;
854	while (iPT-- > 0)
855	{
856	if ( pPD->a[iPDE + iPT].n.u1Present /** @todo PGMGstGetPDE. */
857	&& ( pVM->fRawR0Enabled
858	\|\| pPD->a[iPDE + iPT].n.u1User))
859	{
860	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
861
862	#ifdef IN_RING3
863	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping %s (32 bits)\n"
864	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
865	(iPT + iPDE) << X86_PD_SHIFT, pCur->pszDesc,
866	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
867	int rc = pgmR3SyncPTResolveConflict(pVM, pCur, pPD, iPDE << X86_PD_SHIFT);
868	AssertRCReturn(rc, rc);
869	break;
870	#else
871	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping (32 bits)\n"
872	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
873	(iPT + iPDE) << X86_PD_SHIFT,
874	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
875	return VINF_PGM_SYNC_CR3;
876	#endif
877	}
878	}
879	pCur = pNext;
880	}
881	}
882	else if ( enmGuestMode == PGMMODE_PAE
883	\|\| enmGuestMode == PGMMODE_PAE_NX)
884	{
885	/*
886	* Iterate mappings.
887	*/
888	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur;)
889	{
890	PPGMMAPPING pNext = pCur->CTX_SUFF(pNext);
891	RTGCPTR GCPtr = pCur->GCPtr;
892	unsigned iPT = pCur->cb >> X86_PD_PAE_SHIFT;
893	while (iPT-- > 0)
894	{
895	X86PDEPAE Pde = pgmGstGetPaePDE(pVCpu, GCPtr);
896
897	if ( Pde.n.u1Present
898	&& (pVM->fRawR0Enabled \|\| Pde.n.u1User))
899	{
900	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
901	#ifdef IN_RING3
902	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping %s (PAE)\n"
903	" PDE=%016RX64.\n",
904	GCPtr, pCur->pszDesc, Pde.u));
905	int rc = pgmR3SyncPTResolveConflictPAE(pVM, pCur, pCur->GCPtr);
906	AssertRCReturn(rc, rc);
907	break;
908	#else
909	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping (PAE)\n"
910	" PDE=%016RX64.\n",
911	GCPtr, Pde.u));
912	return VINF_PGM_SYNC_CR3;
913	#endif
914	}
915	GCPtr += (1 << X86_PD_PAE_SHIFT);
916	}
917	pCur = pNext;
918	}
919	}
920	else
921	AssertFailed();
922
923	Assert(!PGMMapHasConflicts(pVM));
924	return VINF_SUCCESS;
925	}
926
927	#endif /* IN_RING0 */
928

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllMap.cpp@ 34147

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