PGMAllMap.cpp@ 41829

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1	/* $Id: PGMAllMap.cpp 41802 2012-06-17 17:01:56Z 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/vmm/pgm.h>
23	#include <VBox/vmm/em.h>
24	#include "PGMInternal.h"
25	#include <VBox/vmm/vm.h>
26	#include "PGMInline.h"
27	#include <VBox/err.h>
28	#include <iprt/asm-amd64-x86.h>
29	#include <iprt/assert.h>
30
31
32	/**
33	* Maps a range of physical pages at a given virtual address
34	* in the guest context.
35	*
36	* The GC virtual address range must be within an existing mapping.
37	*
38	* @returns VBox status code.
39	* @param pVM The virtual machine.
40	* @param GCPtr Where to map the page(s). Must be page aligned.
41	* @param HCPhys Start of the range of physical pages. Must be page aligned.
42	* @param cbPages Number of bytes to map. Must be page aligned.
43	* @param fFlags Page flags (X86_PTE_*).
44	*/
45	VMMDECL(int) PGMMap(PVM pVM, RTGCUINTPTR GCPtr, RTHCPHYS HCPhys, uint32_t cbPages, unsigned fFlags)
46	{
47	AssertMsg(pVM->pgm.s.offVM, ("Bad init order\n"));
48
49	/*
50	* Validate input.
51	*/
52	AssertMsg(RT_ALIGN_T(GCPtr, PAGE_SIZE, RTGCUINTPTR) == GCPtr, ("Invalid alignment GCPtr=%#x\n", GCPtr));
53	AssertMsg(cbPages > 0 && RT_ALIGN_32(cbPages, PAGE_SIZE) == cbPages, ("Invalid cbPages=%#x\n", cbPages));
54	AssertMsg(!(fFlags & X86_PDE_PG_MASK), ("Invalid flags %#x\n", fFlags));
55
56	/* hypervisor defaults */
57	if (!fFlags)
58	fFlags = X86_PTE_P \| X86_PTE_A \| X86_PTE_D;
59
60	/*
61	* Find the mapping.
62	*/
63	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
64	while (pCur)
65	{
66	if (GCPtr - pCur->GCPtr < pCur->cb)
67	{
68	if (GCPtr + cbPages - 1 > pCur->GCPtrLast)
69	{
70	AssertMsgFailed(("Invalid range!!\n"));
71	return VERR_INVALID_PARAMETER;
72	}
73
74	/*
75	* Setup PTE.
76	*/
77	X86PTEPAE Pte;
78	Pte.u = fFlags \| (HCPhys & X86_PTE_PAE_PG_MASK);
79
80	/*
81	* Update the page tables.
82	*/
83	for (;;)
84	{
85	RTGCUINTPTR off = GCPtr - pCur->GCPtr;
86	const unsigned iPT = off >> X86_PD_SHIFT;
87	const unsigned iPageNo = (off >> PAGE_SHIFT) & X86_PT_MASK;
88
89	/* 32-bit */
90	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! */
91
92	/* pae */
93	PGMSHWPTEPAE_SET(pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPageNo / 512].a[iPageNo % 512], Pte.u);
94
95	/* next */
96	cbPages -= PAGE_SIZE;
97	if (!cbPages)
98	break;
99	GCPtr += PAGE_SIZE;
100	Pte.u += PAGE_SIZE;
101	}
102
103	return VINF_SUCCESS;
104	}
105
106	/* next */
107	pCur = pCur->CTX_SUFF(pNext);
108	}
109
110	AssertMsgFailed(("GCPtr=%#x was not found in any mapping ranges!\n", GCPtr));
111	return VERR_INVALID_PARAMETER;
112	}
113
114
115	/**
116	* Sets (replaces) the page flags for a range of pages in a mapping.
117	*
118	* @returns VBox status.
119	* @param pVM Pointer to the VM.
120	* @param GCPtr Virtual address of the first page in the range.
121	* @param cb Size (in bytes) of the range to apply the modification to.
122	* @param fFlags Page flags X86_PTE_*, excluding the page mask of course.
123	*/
124	VMMDECL(int) PGMMapSetPage(PVM pVM, RTGCPTR GCPtr, uint64_t cb, uint64_t fFlags)
125	{
126	return PGMMapModifyPage(pVM, GCPtr, cb, fFlags, 0);
127	}
128
129
130	/**
131	* Modify page flags for a range of pages in a mapping.
132	*
133	* The existing flags are ANDed with the fMask and ORed with the fFlags.
134	*
135	* @returns VBox status code.
136	* @param pVM Pointer to the VM.
137	* @param GCPtr Virtual address of the first page in the range.
138	* @param cb Size (in bytes) of the range to apply the modification to.
139	* @param fFlags The OR mask - page flags X86_PTE_*, excluding the page mask of course.
140	* @param fMask The AND mask - page flags X86_PTE_*, excluding the page mask of course.
141	*/
142	VMMDECL(int) PGMMapModifyPage(PVM pVM, RTGCPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask)
143	{
144	/*
145	* Validate input.
146	*/
147	AssertMsg(!(fFlags & (X86_PTE_PAE_PG_MASK \| X86_PTE_PAE_MBZ_MASK_NX)), ("fFlags=%#x\n", fFlags));
148	Assert(cb);
149
150	/*
151	* Align the input.
152	*/
153	cb += (RTGCUINTPTR)GCPtr & PAGE_OFFSET_MASK;
154	cb = RT_ALIGN_Z(cb, PAGE_SIZE);
155	GCPtr = (RTGCPTR)((RTGCUINTPTR)GCPtr & PAGE_BASE_GC_MASK);
156
157	/*
158	* Find the mapping.
159	*/
160	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
161	while (pCur)
162	{
163	RTGCUINTPTR off = (RTGCUINTPTR)GCPtr - (RTGCUINTPTR)pCur->GCPtr;
164	if (off < pCur->cb)
165	{
166	AssertMsgReturn(off + cb <= pCur->cb,
167	("Invalid page range %#x LB%#x. mapping '%s' %#x to %#x\n",
168	GCPtr, cb, pCur->pszDesc, pCur->GCPtr, pCur->GCPtrLast),
169	VERR_INVALID_PARAMETER);
170
171	/*
172	* Perform the requested operation.
173	*/
174	while (cb > 0)
175	{
176	unsigned iPT = off >> X86_PD_SHIFT;
177	unsigned iPTE = (off >> PAGE_SHIFT) & X86_PT_MASK;
178	while (cb > 0 && iPTE < RT_ELEMENTS(pCur->aPTs[iPT].CTX_SUFF(pPT)->a))
179	{
180	/* 32-Bit */
181	pCur->aPTs[iPT].CTX_SUFF(pPT)->a[iPTE].u &= fMask \| X86_PTE_PG_MASK;
182	pCur->aPTs[iPT].CTX_SUFF(pPT)->a[iPTE].u \|= fFlags & ~X86_PTE_PG_MASK;
183
184	/* PAE */
185	PPGMSHWPTEPAE pPtePae = &pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPTE / 512].a[iPTE % 512];
186	PGMSHWPTEPAE_SET(*pPtePae,
187	( PGMSHWPTEPAE_GET_U(*pPtePae)
188	& (fMask \| X86_PTE_PAE_PG_MASK))
189	\| (fFlags & ~(X86_PTE_PAE_PG_MASK \| X86_PTE_PAE_MBZ_MASK_NX)));
190
191	/* invalidate tls */
192	PGM_INVL_PG(VMMGetCpu(pVM), (RTGCUINTPTR)pCur->GCPtr + off);
193
194	/* next */
195	iPTE++;
196	cb -= PAGE_SIZE;
197	off += PAGE_SIZE;
198	}
199	}
200
201	return VINF_SUCCESS;
202	}
203	/* next */
204	pCur = pCur->CTX_SUFF(pNext);
205	}
206
207	AssertMsgFailed(("Page range %#x LB%#x not found\n", GCPtr, cb));
208	return VERR_INVALID_PARAMETER;
209	}
210
211
212	/**
213	* Get information about a page in a mapping.
214	*
215	* This differs from PGMShwGetPage and PGMGstGetPage in that it only consults
216	* the page table to calculate the flags.
217	*
218	* @returns VINF_SUCCESS, VERR_PAGE_NOT_PRESENT or VERR_NOT_FOUND.
219	* @param pVM Pointer to the VM.
220	* @param GCPtr The page address.
221	* @param pfFlags Where to return the flags. Optional.
222	* @param pHCPhys Where to return the address. Optional.
223	*/
224	VMMDECL(int) PGMMapGetPage(PVM pVM, RTGCPTR GCPtr, uint64_t *pfFlags, PRTHCPHYS pHCPhys)
225	{
226	/*
227	* Find the mapping.
228	*/
229	GCPtr &= PAGE_BASE_GC_MASK;
230	PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings);
231	while (pCur)
232	{
233	RTGCUINTPTR off = (RTGCUINTPTR)GCPtr - (RTGCUINTPTR)pCur->GCPtr;
234	if (off < pCur->cb)
235	{
236	/*
237	* Dig out the information.
238	*/
239	int rc = VINF_SUCCESS;
240	unsigned iPT = off >> X86_PD_SHIFT;
241	unsigned iPTE = (off >> PAGE_SHIFT) & X86_PT_MASK;
242	PCPGMSHWPTEPAE pPtePae = &pCur->aPTs[iPT].CTX_SUFF(paPaePTs)[iPTE / 512].a[iPTE % 512];
243	if (PGMSHWPTEPAE_IS_P(*pPtePae))
244	{
245	if (pfFlags)
246	pfFlags = PGMSHWPTEPAE_GET_U(pPtePae) & ~X86_PTE_PAE_PG_MASK;
247	if (pHCPhys)
248	pHCPhys = PGMSHWPTEPAE_GET_HCPHYS(pPtePae);
249	}
250	else
251	rc = VERR_PAGE_NOT_PRESENT;
252	return rc;
253	}
254	/* next */
255	pCur = pCur->CTX_SUFF(pNext);
256	}
257
258	return VERR_NOT_FOUND;
259	}
260
261
262
263	#ifndef IN_RING0
264	/**
265	* Sets all PDEs involved with the mapping in the shadow page table.
266	*
267	* @param pVM Pointer to the VM.
268	* @param pMap Pointer to the mapping in question.
269	* @param iNewPDE The index of the 32-bit PDE corresponding to the base of the mapping.
270	*/
271	void pgmMapSetShadowPDEs(PVM pVM, PPGMMAPPING pMap, unsigned iNewPDE)
272	{
273	Log4(("pgmMapSetShadowPDEs new pde %x (mappings enabled %d)\n", iNewPDE, pgmMapAreMappingsEnabled(pVM)));
274
275	if ( !pgmMapAreMappingsEnabled(pVM)
276	\|\| pVM->cCpus > 1)
277	return;
278
279	/* This only applies to raw mode where we only support 1 VCPU. */
280	PVMCPU pVCpu = VMMGetCpu0(pVM);
281	if (!pVCpu->pgm.s.CTX_SUFF(pShwPageCR3))
282	return; /* too early */
283
284	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
285	Assert(enmShadowMode <= PGMMODE_PAE_NX);
286
287	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
288
289	/*
290	* Insert the page tables into the shadow page directories.
291	*/
292	unsigned i = pMap->cPTs;
293	iNewPDE += i;
294	while (i-- > 0)
295	{
296	iNewPDE--;
297
298	switch (enmShadowMode)
299	{
300	case PGMMODE_32_BIT:
301	{
302	PX86PD pShw32BitPd = pgmShwGet32BitPDPtr(pVCpu);
303	AssertFatal(pShw32BitPd);
304
305	/* Free any previous user, unless it's us. */
306	Assert( (pShw32BitPd->a[iNewPDE].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
307	\|\| (pShw32BitPd->a[iNewPDE].u & X86_PDE_PG_MASK) == pMap->aPTs[i].HCPhysPT);
308	if ( pShw32BitPd->a[iNewPDE].n.u1Present
309	&& !(pShw32BitPd->a[iNewPDE].u & PGM_PDFLAGS_MAPPING))
310	pgmPoolFree(pVM, pShw32BitPd->a[iNewPDE].u & X86_PDE_PG_MASK, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3)->idx, iNewPDE);
311
312	/* Default mapping page directory flags are read/write and supervisor; individual page attributes determine the final flags. */
313	pShw32BitPd->a[iNewPDE].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
314	\| (uint32_t)pMap->aPTs[i].HCPhysPT;
315	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShw32BitPd);
316	break;
317	}
318
319	case PGMMODE_PAE:
320	case PGMMODE_PAE_NX:
321	{
322	const uint32_t iPdPt = iNewPDE / 256;
323	unsigned iPaePde = iNewPDE * 2 % 512;
324	PX86PDPT pShwPdpt = pgmShwGetPaePDPTPtr(pVCpu);
325	Assert(pShwPdpt);
326
327	/*
328	* Get the shadow PD.
329	* If no PD, sync it (PAE guest) or fake (not present or 32-bit guest).
330	* Note! The RW, US and A bits are reserved for PAE PDPTEs. Setting the
331	* accessed bit causes invalid VT-x guest state errors.
332	*/
333	PX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, iPdPt << X86_PDPT_SHIFT);
334	if (!pShwPaePd)
335	{
336	X86PDPE GstPdpe;
337	if (PGMGetGuestMode(pVCpu) < PGMMODE_PAE)
338	GstPdpe.u = X86_PDPE_P;
339	else
340	{
341	PX86PDPE pGstPdpe = pgmGstGetPaePDPEPtr(pVCpu, iPdPt << X86_PDPT_SHIFT);
342	if (pGstPdpe)
343	GstPdpe = *pGstPdpe;
344	else
345	GstPdpe.u = X86_PDPE_P;
346	}
347	int rc = pgmShwSyncPaePDPtr(pVCpu, iPdPt << X86_PDPT_SHIFT, GstPdpe.u, &pShwPaePd);
348	AssertFatalRC(rc);
349	}
350	Assert(pShwPaePd);
351
352	/*
353	* Mark the page as locked; disallow flushing.
354	*/
355	PPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdPt].u & X86_PDPE_PG_MASK);
356	AssertFatal(pPoolPagePd);
357	if (!pgmPoolIsPageLocked(pPoolPagePd))
358	pgmPoolLockPage(pPool, pPoolPagePd);
359	#ifdef VBOX_STRICT
360	else if (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING)
361	{
362	Assert(PGMGetGuestMode(pVCpu) >= PGMMODE_PAE); /** @todo We may hit this during reset, will fix later. */
363	AssertFatalMsg( (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT0
364	\|\| !PGMMODE_WITH_PAGING(PGMGetGuestMode(pVCpu)),
365	("%RX64 vs %RX64\n", pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK, pMap->aPTs[i].HCPhysPaePT0));
366	Assert(pShwPaePd->a[iPaePde+1].u & PGM_PDFLAGS_MAPPING);
367	AssertFatalMsg( (pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT1
368	\|\| !PGMMODE_WITH_PAGING(PGMGetGuestMode(pVCpu)),
369	("%RX64 vs %RX64\n", pShwPaePd->a[iPaePde+1].u & X86_PDE_PAE_PG_MASK, pMap->aPTs[i].HCPhysPaePT1));
370	}
371	#endif
372
373	/*
374	* Insert our first PT, freeing anything we might be replacing unless it's a mapping (i.e. us).
375	*/
376	Assert( (pShwPaePd->a[iPaePde].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
377	\|\| (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT0);
378	if ( pShwPaePd->a[iPaePde].n.u1Present
379	&& !(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING))
380	{
381	Assert(!(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
382	pgmPoolFree(pVM, pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK, pPoolPagePd->idx, iPaePde);
383	}
384	pShwPaePd->a[iPaePde].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
385	\| pMap->aPTs[i].HCPhysPaePT0;
386
387	/* 2nd 2 MB PDE of the 4 MB region, same as above. */
388	iPaePde++;
389	AssertFatal(iPaePde < 512);
390	Assert( (pShwPaePd->a[iPaePde].u & (X86_PDE_P \| PGM_PDFLAGS_MAPPING)) != (X86_PDE_P \| PGM_PDFLAGS_MAPPING)
391	\|\| (pShwPaePd->a[iPaePde].u & X86_PDE_PAE_PG_MASK) == pMap->aPTs[i].HCPhysPaePT1);
392	if ( pShwPaePd->a[iPaePde].n.u1Present
393	&& !(pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING))
394	pgmPoolFree(pVM, pShwPaePd->a[iPaePde].u & X86_PDE_PG_MASK, pPoolPagePd->idx, iPaePde);
395	pShwPaePd->a[iPaePde].u = PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US
396	\| pMap->aPTs[i].HCPhysPaePT1;
397
398	/*
399	* Set the PGM_PDFLAGS_MAPPING flag in the page directory pointer entry. (legacy PAE guest mode)
400	*/
401	pShwPdpt->a[iPdPt].u \|= PGM_PLXFLAGS_MAPPING;
402
403	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPaePd);
404	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pShwPdpt);
405	break;
406	}
407
408	default:
409	AssertFailed();
410	break;
411	}
412	}
413	}
414
415
416	/**
417	* Clears all PDEs involved with the mapping in the shadow page table.
418	*
419	* @param pVM Pointer to the VM.
420	* @param pShwPageCR3 CR3 root page
421	* @param pMap Pointer to the mapping in question.
422	* @param iOldPDE The index of the 32-bit PDE corresponding to the base of the mapping.
423	* @param fDeactivateCR3 Set if it's pgmMapDeactivateCR3 calling.
424	*/
425	void pgmMapClearShadowPDEs(PVM pVM, PPGMPOOLPAGE pShwPageCR3, PPGMMAPPING pMap, unsigned iOldPDE, bool fDeactivateCR3)
426	{
427	Log(("pgmMapClearShadowPDEs: old pde %x (cPTs=%x) (mappings enabled %d) fDeactivateCR3=%RTbool\n", iOldPDE, pMap->cPTs, pgmMapAreMappingsEnabled(pVM), fDeactivateCR3));
428
429	/*
430	* Skip this if disabled or if it doesn't apply.
431	*/
432	if ( !pgmMapAreMappingsEnabled(pVM)
433	\|\| pVM->cCpus > 1)
434	return;
435
436	Assert(pShwPageCR3);
437
438	/* This only applies to raw mode where we only support 1 VCPU. */
439	PVMCPU pVCpu = VMMGetCpu0(pVM);
440	# ifdef IN_RC
441	Assert(pShwPageCR3 != pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
442	# endif
443
444	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
445
446	PX86PDPT pCurrentShwPdpt = NULL;
447	if ( PGMGetGuestMode(pVCpu) >= PGMMODE_PAE
448	&& pShwPageCR3 != pVCpu->pgm.s.CTX_SUFF(pShwPageCR3))
449	pCurrentShwPdpt = pgmShwGetPaePDPTPtr(pVCpu);
450
451	unsigned i = pMap->cPTs;
452	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
453
454	iOldPDE += i;
455	while (i-- > 0)
456	{
457	iOldPDE--;
458
459	switch(enmShadowMode)
460	{
461	case PGMMODE_32_BIT:
462	{
463	PX86PD pShw32BitPd = (PX86PD)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
464	AssertFatal(pShw32BitPd);
465
466	Assert(!pShw32BitPd->a[iOldPDE].n.u1Present \|\| (pShw32BitPd->a[iOldPDE].u & PGM_PDFLAGS_MAPPING));
467	pShw32BitPd->a[iOldPDE].u = 0;
468	break;
469	}
470
471	case PGMMODE_PAE:
472	case PGMMODE_PAE_NX:
473	{
474	const unsigned iPdpt = iOldPDE / 256; /* iOldPDE * 2 / 512; iOldPDE is in 4 MB pages */
475	unsigned iPaePde = iOldPDE * 2 % 512;
476	PX86PDPT pShwPdpt = (PX86PDPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
477	PX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, pShwPdpt, (iPdpt << X86_PDPT_SHIFT));
478
479	/*
480	* Clear the PGM_PDFLAGS_MAPPING flag for the page directory pointer entry. (legacy PAE guest mode)
481	*/
482	if (fDeactivateCR3)
483	pShwPdpt->a[iPdpt].u &= ~PGM_PLXFLAGS_MAPPING;
484	else if (pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING)
485	{
486	/* See if there are any other mappings here. This is suboptimal code. */
487	pShwPdpt->a[iPdpt].u &= ~PGM_PLXFLAGS_MAPPING;
488	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
489	if ( pCur != pMap
490	&& ( (pCur->GCPtr >> X86_PDPT_SHIFT) == iPdpt
491	\|\| (pCur->GCPtrLast >> X86_PDPT_SHIFT) == iPdpt))
492	{
493	pShwPdpt->a[iPdpt].u \|= PGM_PLXFLAGS_MAPPING;
494	break;
495	}
496	}
497
498	/*
499	* If the page directory of the old CR3 is reused in the new one, then don't
500	* clear the hypervisor mappings.
501	*/
502	if ( pCurrentShwPdpt
503	&& (pCurrentShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK) == (pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK) )
504	{
505	LogFlow(("pgmMapClearShadowPDEs: Pdpe %d reused -> don't clear hypervisor mappings!\n", iPdpt));
506	break;
507	}
508
509	/*
510	* Clear the mappings in the PD.
511	*/
512	AssertFatal(pShwPaePd);
513	Assert(!pShwPaePd->a[iPaePde].n.u1Present \|\| (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
514	pShwPaePd->a[iPaePde].u = 0;
515
516	iPaePde++;
517	AssertFatal(iPaePde < 512);
518	Assert(!pShwPaePd->a[iPaePde].n.u1Present \|\| (pShwPaePd->a[iPaePde].u & PGM_PDFLAGS_MAPPING));
519	pShwPaePd->a[iPaePde].u = 0;
520
521	/*
522	* Unlock the shadow pool PD page if the PDPTE no longer holds any mappings.
523	*/
524	if ( fDeactivateCR3
525	\|\| !(pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING))
526	{
527	PPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK);
528	AssertFatal(pPoolPagePd);
529	if (pgmPoolIsPageLocked(pPoolPagePd))
530	pgmPoolUnlockPage(pPool, pPoolPagePd);
531	}
532	break;
533	}
534
535	default:
536	AssertFailed();
537	break;
538	}
539	}
540
541	PGM_DYNMAP_UNUSED_HINT_VM(pVM, pCurrentShwPdpt);
542	}
543	#endif /* !IN_RING0 */
544
545	#if defined(VBOX_STRICT) && !defined(IN_RING0)
546	/**
547	* Clears all PDEs involved with the mapping in the shadow page table.
548	*
549	* @param pVM Pointer to the VM.
550	* @param pVCpu Pointer to the VMCPU.
551	* @param pShwPageCR3 CR3 root page
552	* @param pMap Pointer to the mapping in question.
553	* @param iPDE The index of the 32-bit PDE corresponding to the base of the mapping.
554	*/
555	static void pgmMapCheckShadowPDEs(PVM pVM, PVMCPU pVCpu, PPGMPOOLPAGE pShwPageCR3, PPGMMAPPING pMap, unsigned iPDE)
556	{
557	Assert(pShwPageCR3);
558
559	uint32_t i = pMap->cPTs;
560	PGMMODE enmShadowMode = PGMGetShadowMode(pVCpu);
561	PPGMPOOL pPool = pVM->pgm.s.CTX_SUFF(pPool);
562
563	iPDE += i;
564	while (i-- > 0)
565	{
566	iPDE--;
567
568	switch (enmShadowMode)
569	{
570	case PGMMODE_32_BIT:
571	{
572	PCX86PD pShw32BitPd = (PCX86PD)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
573	AssertFatal(pShw32BitPd);
574
575	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),
576	("Expected %x vs %x; iPDE=%#x %RGv %s\n",
577	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),
578	iPDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
579	break;
580	}
581
582	case PGMMODE_PAE:
583	case PGMMODE_PAE_NX:
584	{
585	const unsigned iPdpt = iPDE / 256; /* iPDE * 2 / 512; iPDE is in 4 MB pages */
586	unsigned iPaePDE = iPDE * 2 % 512;
587	PX86PDPT pShwPdpt = (PX86PDPT)PGMPOOL_PAGE_2_PTR_V2(pVM, pVCpu, pShwPageCR3);
588	PCX86PDPAE pShwPaePd = pgmShwGetPaePDPtr(pVCpu, pShwPdpt, iPdpt << X86_PDPT_SHIFT);
589	AssertFatal(pShwPaePd);
590
591	AssertMsg(pShwPaePd->a[iPaePDE].u == (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT0),
592	("Expected %RX64 vs %RX64; iPDE=%#x iPdpt=%#x iPaePDE=%#x %RGv %s\n",
593	pShwPaePd->a[iPaePDE].u, (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT0),
594	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
595
596	iPaePDE++;
597	AssertFatal(iPaePDE < 512);
598
599	AssertMsg(pShwPaePd->a[iPaePDE].u == (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT1),
600	("Expected %RX64 vs %RX64; iPDE=%#x iPdpt=%#x iPaePDE=%#x %RGv %s\n",
601	pShwPaePd->a[iPaePDE].u, (PGM_PDFLAGS_MAPPING \| X86_PDE_P \| X86_PDE_A \| X86_PDE_RW \| X86_PDE_US \| pMap->aPTs[i].HCPhysPaePT1),
602	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
603
604	AssertMsg(pShwPdpt->a[iPdpt].u & PGM_PLXFLAGS_MAPPING,
605	("%RX64; iPdpt=%#x iPDE=%#x iPaePDE=%#x %RGv %s\n",
606	pShwPdpt->a[iPdpt].u,
607	iPDE, iPdpt, iPaePDE, pMap->GCPtr, R3STRING(pMap->pszDesc) ));
608
609	PCPGMPOOLPAGE pPoolPagePd = pgmPoolGetPage(pPool, pShwPdpt->a[iPdpt].u & X86_PDPE_PG_MASK);
610	AssertFatal(pPoolPagePd);
611	AssertMsg(pPoolPagePd->cLocked, (".idx=%d .type=%d\n", pPoolPagePd->idx, pPoolPagePd->enmKind));
612	break;
613	}
614
615	default:
616	AssertFailed();
617	break;
618	}
619	}
620	}
621
622
623	/**
624	* Check the hypervisor mappings in the active CR3.
625	*
626	* @param pVM The virtual machine.
627	*/
628	VMMDECL(void) PGMMapCheck(PVM pVM)
629	{
630	/*
631	* Can skip this if mappings are disabled.
632	*/
633	if (!pgmMapAreMappingsEnabled(pVM))
634	return;
635
636	/* This only applies to raw mode where we only support 1 VCPU. */
637	Assert(pVM->cCpus == 1);
638	PVMCPU pVCpu = VMMGetCpu0(pVM);
639	Assert(pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
640
641	/*
642	* Iterate mappings.
643	*/
644	pgmLock(pVM); /* to avoid assertions */
645	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
646	{
647	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
648	pgmMapCheckShadowPDEs(pVM, pVCpu, pVCpu->pgm.s.CTX_SUFF(pShwPageCR3), pCur, iPDE);
649	}
650	pgmUnlock(pVM);
651	}
652	#endif /* defined(VBOX_STRICT) && !defined(IN_RING0) */
653
654	#ifndef IN_RING0
655
656	/**
657	* Apply the hypervisor mappings to the active CR3.
658	*
659	* @returns VBox status.
660	* @param pVM The virtual machine.
661	* @param pShwPageCR3 CR3 root page
662	*/
663	int pgmMapActivateCR3(PVM pVM, PPGMPOOLPAGE pShwPageCR3)
664	{
665	/*
666	* Skip this if disabled or if it doesn't apply.
667	*/
668	if ( !pgmMapAreMappingsEnabled(pVM)
669	\|\| pVM->cCpus > 1)
670	return VINF_SUCCESS;
671
672	/* Note! This might not be logged successfully in RC because we usually
673	cannot flush the log at this point. */
674	Log4(("pgmMapActivateCR3: fixed mappings=%RTbool idxShwPageCR3=%#x\n", pVM->pgm.s.fMappingsFixed, pShwPageCR3 ? pShwPageCR3->idx : NIL_PGMPOOL_IDX));
675
676	#ifdef VBOX_STRICT
677	PVMCPU pVCpu = VMMGetCpu0(pVM);
678	Assert(pShwPageCR3 && pShwPageCR3 == pVCpu->pgm.s.CTX_SUFF(pShwPageCR3));
679	#endif
680
681	/*
682	* Iterate mappings.
683	*/
684	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
685	{
686	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
687	pgmMapSetShadowPDEs(pVM, pCur, iPDE);
688	}
689	return VINF_SUCCESS;
690	}
691
692
693	/**
694	* Remove the hypervisor mappings from the specified CR3
695	*
696	* @returns VBox status.
697	* @param pVM The virtual machine.
698	* @param pShwPageCR3 CR3 root page
699	*/
700	int pgmMapDeactivateCR3(PVM pVM, PPGMPOOLPAGE pShwPageCR3)
701	{
702	/*
703	* Skip this if disabled or if it doesn't apply.
704	*/
705	if ( !pgmMapAreMappingsEnabled(pVM)
706	\|\| pVM->cCpus > 1)
707	return VINF_SUCCESS;
708
709	Assert(pShwPageCR3);
710	Log4(("pgmMapDeactivateCR3: fixed mappings=%d idxShwPageCR3=%#x\n", pVM->pgm.s.fMappingsFixed, pShwPageCR3 ? pShwPageCR3->idx : NIL_PGMPOOL_IDX));
711
712	/*
713	* Iterate mappings.
714	*/
715	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
716	{
717	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
718	pgmMapClearShadowPDEs(pVM, pShwPageCR3, pCur, iPDE, true /fDeactivateCR3/);
719	}
720	return VINF_SUCCESS;
721	}
722
723
724	/**
725	* Checks guest PD for conflicts with VMM GC mappings.
726	*
727	* @returns true if conflict detected.
728	* @returns false if not.
729	* @param pVM The virtual machine.
730	*/
731	VMMDECL(bool) PGMMapHasConflicts(PVM pVM)
732	{
733	/*
734	* Can skip this if mappings are safely fixed.
735	*/
736	if (!pgmMapAreMappingsFloating(pVM))
737	return false;
738
739	Assert(pVM->cCpus == 1);
740
741	/* This only applies to raw mode where we only support 1 VCPU. */
742	PVMCPU pVCpu = &pVM->aCpus[0];
743
744	PGMMODE const enmGuestMode = PGMGetGuestMode(pVCpu);
745	Assert(enmGuestMode <= PGMMODE_PAE_NX);
746
747	/*
748	* Iterate mappings.
749	*/
750	if (enmGuestMode == PGMMODE_32_BIT)
751	{
752	/*
753	* Resolve the page directory.
754	*/
755	PX86PD pPD = pgmGstGet32bitPDPtr(pVCpu);
756	Assert(pPD);
757
758	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
759	{
760	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
761	unsigned iPT = pCur->cPTs;
762	while (iPT-- > 0)
763	if ( pPD->a[iPDE + iPT].n.u1Present /** @todo PGMGstGetPDE. */
764	&& (EMIsRawRing0Enabled(pVM) \|\| pPD->a[iPDE + iPT].n.u1User))
765	{
766	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
767
768	#ifdef IN_RING3
769	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping %s (32 bits)\n"
770	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
771	(iPT + iPDE) << X86_PD_SHIFT, pCur->pszDesc,
772	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
773	#else
774	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping (32 bits)\n"
775	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
776	(iPT + iPDE) << X86_PD_SHIFT,
777	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
778	#endif
779	return true;
780	}
781	}
782	}
783	else if ( enmGuestMode == PGMMODE_PAE
784	\|\| enmGuestMode == PGMMODE_PAE_NX)
785	{
786	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; pCur = pCur->CTX_SUFF(pNext))
787	{
788	RTGCPTR GCPtr = pCur->GCPtr;
789
790	unsigned iPT = pCur->cb >> X86_PD_PAE_SHIFT;
791	while (iPT-- > 0)
792	{
793	X86PDEPAE Pde = pgmGstGetPaePDE(pVCpu, GCPtr);
794
795	if ( Pde.n.u1Present
796	&& (EMIsRawRing0Enabled(pVM) \|\| Pde.n.u1User))
797	{
798	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
799	#ifdef IN_RING3
800	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping %s (PAE)\n"
801	" PDE=%016RX64.\n",
802	GCPtr, pCur->pszDesc, Pde.u));
803	#else
804	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping (PAE)\n"
805	" PDE=%016RX64.\n",
806	GCPtr, Pde.u));
807	#endif
808	return true;
809	}
810	GCPtr += (1 << X86_PD_PAE_SHIFT);
811	}
812	}
813	}
814	else
815	AssertFailed();
816
817	return false;
818	}
819
820
821	/**
822	* Checks and resolves (ring 3 only) guest conflicts with the guest mappings.
823	*
824	* @returns VBox status.
825	* @param pVM The virtual machine.
826	*/
827	int pgmMapResolveConflicts(PVM pVM)
828	{
829	/* The caller is expected to check these two conditions. */
830	Assert(!pVM->pgm.s.fMappingsFixed);
831	Assert(!pVM->pgm.s.fMappingsDisabled);
832
833	/* This only applies to raw mode where we only support 1 VCPU. */
834	Assert(pVM->cCpus == 1);
835	PVMCPU pVCpu = &pVM->aCpus[0];
836	PGMMODE const enmGuestMode = PGMGetGuestMode(pVCpu);
837	Assert(enmGuestMode <= PGMMODE_PAE_NX);
838
839	if (enmGuestMode == PGMMODE_32_BIT)
840	{
841	/*
842	* Resolve the page directory.
843	*/
844	PX86PD pPD = pgmGstGet32bitPDPtr(pVCpu);
845	Assert(pPD);
846
847	/*
848	* Iterate mappings.
849	*/
850	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur; )
851	{
852	PPGMMAPPING pNext = pCur->CTX_SUFF(pNext);
853	unsigned iPDE = pCur->GCPtr >> X86_PD_SHIFT;
854	unsigned iPT = pCur->cPTs;
855	while (iPT-- > 0)
856	{
857	if ( pPD->a[iPDE + iPT].n.u1Present /** @todo PGMGstGetPDE. */
858	&& ( EMIsRawRing0Enabled(pVM)
859	\|\| pPD->a[iPDE + iPT].n.u1User))
860	{
861	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
862
863	#ifdef IN_RING3
864	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping %s (32 bits)\n"
865	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
866	(iPT + iPDE) << X86_PD_SHIFT, pCur->pszDesc,
867	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
868	int rc = pgmR3SyncPTResolveConflict(pVM, pCur, pPD, iPDE << X86_PD_SHIFT);
869	AssertRCReturn(rc, rc);
870	break;
871	#else
872	Log(("PGMHasMappingConflicts: Conflict was detected at %08RX32 for mapping (32 bits)\n"
873	" iPDE=%#x iPT=%#x PDE=%RGp.\n",
874	(iPT + iPDE) << X86_PD_SHIFT,
875	iPDE, iPT, pPD->a[iPDE + iPT].au32[0]));
876	return VINF_PGM_SYNC_CR3;
877	#endif
878	}
879	}
880	pCur = pNext;
881	}
882	}
883	else if ( enmGuestMode == PGMMODE_PAE
884	\|\| enmGuestMode == PGMMODE_PAE_NX)
885	{
886	/*
887	* Iterate mappings.
888	*/
889	for (PPGMMAPPING pCur = pVM->pgm.s.CTX_SUFF(pMappings); pCur;)
890	{
891	PPGMMAPPING pNext = pCur->CTX_SUFF(pNext);
892	RTGCPTR GCPtr = pCur->GCPtr;
893	unsigned iPT = pCur->cb >> X86_PD_PAE_SHIFT;
894	while (iPT-- > 0)
895	{
896	X86PDEPAE Pde = pgmGstGetPaePDE(pVCpu, GCPtr);
897
898	if ( Pde.n.u1Present
899	&& (EMIsRawRing0Enabled(pVM) \|\| Pde.n.u1User))
900	{
901	STAM_COUNTER_INC(&pVM->pgm.s.CTX_SUFF(pStats)->StatR3DetectedConflicts);
902	#ifdef IN_RING3
903	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping %s (PAE)\n"
904	" PDE=%016RX64.\n",
905	GCPtr, pCur->pszDesc, Pde.u));
906	int rc = pgmR3SyncPTResolveConflictPAE(pVM, pCur, pCur->GCPtr);
907	AssertRCReturn(rc, rc);
908	break;
909	#else
910	Log(("PGMHasMappingConflicts: Conflict was detected at %RGv for mapping (PAE)\n"
911	" PDE=%016RX64.\n",
912	GCPtr, Pde.u));
913	return VINF_PGM_SYNC_CR3;
914	#endif
915	}
916	GCPtr += (1 << X86_PD_PAE_SHIFT);
917	}
918	pCur = pNext;
919	}
920	}
921	else
922	AssertFailed();
923
924	Assert(!PGMMapHasConflicts(pVM));
925	return VINF_SUCCESS;
926	}
927
928	#endif /* IN_RING0 */
929

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllMap.cpp@ 41829

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