PGMAllGst.h@ 88638

Last change on this file since 88638 was 86487, checked in by vboxsync, 4 years ago
VMM/PGM: Working on eliminating page table bitfield use (PAE PTEs). bugref:9841 bugref:9746
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File size: 18.5 KB

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1	/* $Id: PGMAllGst.h 86487 2020-10-08 08:17:31Z vboxsync $ */
2	/** @file
3	* VBox - Page Manager, Guest Paging Template - All context code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 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	/*********************************************************************************************************************************
20	* Internal Functions *
21	*********************************************************************************************************************************/
22	RT_C_DECLS_BEGIN
23	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
24	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
25	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
26	DECLINLINE(int) PGM_GST_NAME(Walk)(PVMCPUCC pVCpu, RTGCPTR GCPtr, PGSTPTWALK pWalk);
27	#endif
28	PGM_GST_DECL(int, GetPage)(PVMCPUCC pVCpu, RTGCPTR GCPtr, uint64_t *pfFlags, PRTGCPHYS pGCPhys);
29	PGM_GST_DECL(int, ModifyPage)(PVMCPUCC pVCpu, RTGCPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask);
30	PGM_GST_DECL(int, GetPDE)(PVMCPUCC pVCpu, RTGCPTR GCPtr, PX86PDEPAE pPDE);
31
32	#ifdef IN_RING3 /* r3 only for now. */
33	PGM_GST_DECL(int, Enter)(PVMCPUCC pVCpu, RTGCPHYS GCPhysCR3);
34	PGM_GST_DECL(int, Relocate)(PVMCPUCC pVCpu, RTGCPTR offDelta);
35	PGM_GST_DECL(int, Exit)(PVMCPUCC pVCpu);
36	#endif
37	RT_C_DECLS_END
38
39
40	/**
41	* Enters the guest mode.
42	*
43	* @returns VBox status code.
44	* @param pVCpu The cross context virtual CPU structure.
45	* @param GCPhysCR3 The physical address from the CR3 register.
46	*/
47	PGM_GST_DECL(int, Enter)(PVMCPUCC pVCpu, RTGCPHYS GCPhysCR3)
48	{
49	/*
50	* Map and monitor CR3
51	*/
52	uintptr_t idxBth = pVCpu->pgm.s.idxBothModeData;
53	AssertReturn(idxBth < RT_ELEMENTS(g_aPgmBothModeData), VERR_PGM_MODE_IPE);
54	AssertReturn(g_aPgmBothModeData[idxBth].pfnMapCR3, VERR_PGM_MODE_IPE);
55	return g_aPgmBothModeData[idxBth].pfnMapCR3(pVCpu, GCPhysCR3);
56	}
57
58
59	/**
60	* Exits the guest mode.
61	*
62	* @returns VBox status code.
63	* @param pVCpu The cross context virtual CPU structure.
64	*/
65	PGM_GST_DECL(int, Exit)(PVMCPUCC pVCpu)
66	{
67	uintptr_t idxBth = pVCpu->pgm.s.idxBothModeData;
68	AssertReturn(idxBth < RT_ELEMENTS(g_aPgmBothModeData), VERR_PGM_MODE_IPE);
69	AssertReturn(g_aPgmBothModeData[idxBth].pfnUnmapCR3, VERR_PGM_MODE_IPE);
70	return g_aPgmBothModeData[idxBth].pfnUnmapCR3(pVCpu);
71	}
72
73
74	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
75	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
76	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
77
78
79	DECLINLINE(int) PGM_GST_NAME(WalkReturnNotPresent)(PVMCPUCC pVCpu, PGSTPTWALK pWalk, int iLevel)
80	{
81	NOREF(iLevel); NOREF(pVCpu);
82	pWalk->Core.fNotPresent = true;
83	pWalk->Core.uLevel = (uint8_t)iLevel;
84	return VERR_PAGE_TABLE_NOT_PRESENT;
85	}
86
87	DECLINLINE(int) PGM_GST_NAME(WalkReturnBadPhysAddr)(PVMCPUCC pVCpu, PGSTPTWALK pWalk, int iLevel, int rc)
88	{
89	AssertMsg(rc == VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS, ("%Rrc\n", rc)); NOREF(rc); NOREF(pVCpu);
90	pWalk->Core.fBadPhysAddr = true;
91	pWalk->Core.uLevel = (uint8_t)iLevel;
92	return VERR_PAGE_TABLE_NOT_PRESENT;
93	}
94
95	DECLINLINE(int) PGM_GST_NAME(WalkReturnRsvdError)(PVMCPUCC pVCpu, PGSTPTWALK pWalk, int iLevel)
96	{
97	NOREF(pVCpu);
98	pWalk->Core.fRsvdError = true;
99	pWalk->Core.uLevel = (uint8_t)iLevel;
100	return VERR_PAGE_TABLE_NOT_PRESENT;
101	}
102
103
104	/**
105	* Performs a guest page table walk.
106	*
107	* @returns VBox status code.
108	* @retval VINF_SUCCESS on success.
109	* @retval VERR_PAGE_TABLE_NOT_PRESENT on failure. Check pWalk for details.
110	*
111	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
112	* @param GCPtr The guest virtual address to walk by.
113	* @param pWalk Where to return the walk result. This is always set.
114	*/
115	DECLINLINE(int) PGM_GST_NAME(Walk)(PVMCPUCC pVCpu, RTGCPTR GCPtr, PGSTPTWALK pWalk)
116	{
117	int rc;
118
119	/*
120	* Init the walking structure.
121	*/
122	RT_ZERO(*pWalk);
123	pWalk->Core.GCPtr = GCPtr;
124
125	# if PGM_GST_TYPE == PGM_TYPE_32BIT \
126	\|\| PGM_GST_TYPE == PGM_TYPE_PAE
127	/*
128	* Boundary check for PAE and 32-bit (prevents trouble further down).
129	*/
130	if (RT_UNLIKELY(GCPtr >= _4G))
131	return PGM_GST_NAME(WalkReturnNotPresent)(pVCpu, pWalk, 8);
132	# endif
133
134	uint32_t fEffective = X86_PTE_RW \| X86_PTE_US \| X86_PTE_PWT \| X86_PTE_PCD \| X86_PTE_A \| 1;
135	{
136	# if PGM_GST_TYPE == PGM_TYPE_AMD64
137	/*
138	* The PMLE4.
139	*/
140	rc = pgmGstGetLongModePML4PtrEx(pVCpu, &pWalk->pPml4);
141	if (RT_SUCCESS(rc)) { /* probable */ }
142	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 4, rc);
143
144	PX86PML4E pPml4e;
145	pWalk->pPml4e = pPml4e = &pWalk->pPml4->a[(GCPtr >> X86_PML4_SHIFT) & X86_PML4_MASK];
146	X86PML4E Pml4e;
147	pWalk->Pml4e.u = Pml4e.u = pPml4e->u;
148
149	if (Pml4e.u & X86_PML4E_P) { /* probable */ }
150	else return PGM_GST_NAME(WalkReturnNotPresent)(pVCpu, pWalk, 4);
151
152	if (RT_LIKELY(GST_IS_PML4E_VALID(pVCpu, Pml4e))) { /* likely */ }
153	else return PGM_GST_NAME(WalkReturnRsvdError)(pVCpu, pWalk, 4);
154
155	pWalk->Core.fEffective = fEffective = ((uint32_t)Pml4e.u & (X86_PML4E_RW \| X86_PML4E_US \| X86_PML4E_PWT \| X86_PML4E_PCD \| X86_PML4E_A))
156	\| ((uint32_t)(Pml4e.u >> 63) ^ 1) /NX /;
157
158	/*
159	* The PDPE.
160	*/
161	rc = PGM_GCPHYS_2_PTR_BY_VMCPU(pVCpu, Pml4e.u & X86_PML4E_PG_MASK, &pWalk->pPdpt);
162	if (RT_SUCCESS(rc)) { /* probable */ }
163	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 3, rc);
164
165	# elif PGM_GST_TYPE == PGM_TYPE_PAE
166	rc = pgmGstGetPaePDPTPtrEx(pVCpu, &pWalk->pPdpt);
167	if (RT_SUCCESS(rc)) { /* probable */ }
168	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 8, rc);
169	# endif
170	}
171	{
172	# if PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_GST_TYPE == PGM_TYPE_PAE
173	PX86PDPE pPdpe;
174	pWalk->pPdpe = pPdpe = &pWalk->pPdpt->a[(GCPtr >> GST_PDPT_SHIFT) & GST_PDPT_MASK];
175	X86PDPE Pdpe;
176	pWalk->Pdpe.u = Pdpe.u = pPdpe->u;
177
178	if (Pdpe.u & X86_PDPE_P) { /* probable */ }
179	else return PGM_GST_NAME(WalkReturnNotPresent)(pVCpu, pWalk, 3);
180
181	if (RT_LIKELY(GST_IS_PDPE_VALID(pVCpu, Pdpe))) { /* likely */ }
182	else return PGM_GST_NAME(WalkReturnRsvdError)(pVCpu, pWalk, 3);
183
184	# if PGM_GST_TYPE == PGM_TYPE_AMD64
185	pWalk->Core.fEffective = fEffective &= ((uint32_t)Pdpe.u & (X86_PDPE_RW \| X86_PDPE_US \| X86_PDPE_PWT \| X86_PDPE_PCD \| X86_PDPE_A))
186	\| ((uint32_t)(Pdpe.u >> 63) ^ 1) /NX /;
187	# else
188	pWalk->Core.fEffective = fEffective = X86_PDPE_RW \| X86_PDPE_US \| X86_PDPE_A
189	\| ((uint32_t)Pdpe.u & (X86_PDPE_PWT \| X86_PDPE_PCD))
190	\| ((uint32_t)(Pdpe.u >> 63) ^ 1) /NX /;
191	# endif
192
193	/*
194	* The PDE.
195	*/
196	rc = PGM_GCPHYS_2_PTR_BY_VMCPU(pVCpu, Pdpe.u & X86_PDPE_PG_MASK, &pWalk->pPd);
197	if (RT_SUCCESS(rc)) { /* probable */ }
198	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 2, rc);
199	# elif PGM_GST_TYPE == PGM_TYPE_32BIT
200	rc = pgmGstGet32bitPDPtrEx(pVCpu, &pWalk->pPd);
201	if (RT_SUCCESS(rc)) { /* probable */ }
202	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 8, rc);
203	# endif
204	}
205	{
206	PGSTPDE pPde;
207	pWalk->pPde = pPde = &pWalk->pPd->a[(GCPtr >> GST_PD_SHIFT) & GST_PD_MASK];
208	GSTPDE Pde;
209	pWalk->Pde.u = Pde.u = pPde->u;
210	if (Pde.u & X86_PDE_P) { /* probable */ }
211	else return PGM_GST_NAME(WalkReturnNotPresent)(pVCpu, pWalk, 2);
212	if ((Pde.u & X86_PDE_PS) && GST_IS_PSE_ACTIVE(pVCpu))
213	{
214	if (RT_LIKELY(GST_IS_BIG_PDE_VALID(pVCpu, Pde))) { /* likely */ }
215	else return PGM_GST_NAME(WalkReturnRsvdError)(pVCpu, pWalk, 2);
216
217	/*
218	* We're done.
219	*/
220	# if PGM_GST_TYPE == PGM_TYPE_32BIT
221	fEffective &= Pde.u & (X86_PDE4M_RW \| X86_PDE4M_US \| X86_PDE4M_PWT \| X86_PDE4M_PCD \| X86_PDE4M_A);
222	# else
223	fEffective &= ((uint32_t)Pde.u & (X86_PDE4M_RW \| X86_PDE4M_US \| X86_PDE4M_PWT \| X86_PDE4M_PCD \| X86_PDE4M_A))
224	\| ((uint32_t)(Pde.u >> 63) ^ 1) /NX /;
225	# endif
226	fEffective \|= (uint32_t)Pde.u & (X86_PDE4M_D \| X86_PDE4M_G);
227	fEffective \|= (uint32_t)(Pde.u & X86_PDE4M_PAT) >> X86_PDE4M_PAT_SHIFT;
228	pWalk->Core.fEffective = fEffective;
229
230	pWalk->Core.fEffectiveRW = !!(fEffective & X86_PTE_RW);
231	pWalk->Core.fEffectiveUS = !!(fEffective & X86_PTE_US);
232	# if PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_GST_TYPE == PGM_TYPE_PAE
233	pWalk->Core.fEffectiveNX = !(fEffective & 1) && GST_IS_NX_ACTIVE(pVCpu);
234	# else
235	pWalk->Core.fEffectiveNX = false;
236	# endif
237	pWalk->Core.fBigPage = true;
238	pWalk->Core.fSucceeded = true;
239
240	pWalk->Core.GCPhys = GST_GET_BIG_PDE_GCPHYS(pVCpu->CTX_SUFF(pVM), Pde)
241	\| (GCPtr & GST_BIG_PAGE_OFFSET_MASK);
242	PGM_A20_APPLY_TO_VAR(pVCpu, pWalk->Core.GCPhys);
243	return VINF_SUCCESS;
244	}
245
246	if (RT_UNLIKELY(!GST_IS_PDE_VALID(pVCpu, Pde)))
247	return PGM_GST_NAME(WalkReturnRsvdError)(pVCpu, pWalk, 2);
248	# if PGM_GST_TYPE == PGM_TYPE_32BIT
249	pWalk->Core.fEffective = fEffective &= Pde.u & (X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD \| X86_PDE_A);
250	# else
251	pWalk->Core.fEffective = fEffective &= ((uint32_t)Pde.u & (X86_PDE_RW \| X86_PDE_US \| X86_PDE_PWT \| X86_PDE_PCD \| X86_PDE_A))
252	\| ((uint32_t)(Pde.u >> 63) ^ 1) /NX /;
253	# endif
254
255	/*
256	* The PTE.
257	*/
258	rc = PGM_GCPHYS_2_PTR_BY_VMCPU(pVCpu, GST_GET_PDE_GCPHYS(Pde), &pWalk->pPt);
259	if (RT_SUCCESS(rc)) { /* probable */ }
260	else return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 1, rc);
261	}
262	{
263	PGSTPTE pPte;
264	pWalk->pPte = pPte = &pWalk->pPt->a[(GCPtr >> GST_PT_SHIFT) & GST_PT_MASK];
265	GSTPTE Pte;
266	pWalk->Pte.u = Pte.u = pPte->u;
267
268	if (Pte.u & X86_PTE_P) { /* probable */ }
269	else return PGM_GST_NAME(WalkReturnNotPresent)(pVCpu, pWalk, 1);
270
271	if (RT_LIKELY(GST_IS_PTE_VALID(pVCpu, Pte))) { /* likely */ }
272	else return PGM_GST_NAME(WalkReturnRsvdError)(pVCpu, pWalk, 1);
273
274	/*
275	* We're done.
276	*/
277	# if PGM_GST_TYPE == PGM_TYPE_32BIT
278	fEffective &= Pte.u & (X86_PTE_RW \| X86_PTE_US \| X86_PTE_PWT \| X86_PTE_PCD \| X86_PTE_A);
279	# else
280	fEffective &= ((uint32_t)Pte.u & (X86_PTE_RW \| X86_PTE_US \| X86_PTE_PWT \| X86_PTE_PCD \| X86_PTE_A))
281	\| ((uint32_t)(Pte.u >> 63) ^ 1) /NX /;
282	# endif
283	fEffective \|= (uint32_t)Pte.u & (X86_PTE_D \| X86_PTE_PAT \| X86_PTE_G);
284	pWalk->Core.fEffective = fEffective;
285
286	pWalk->Core.fEffectiveRW = !!(fEffective & X86_PTE_RW);
287	pWalk->Core.fEffectiveUS = !!(fEffective & X86_PTE_US);
288	# if PGM_GST_TYPE == PGM_TYPE_AMD64 \|\| PGM_GST_TYPE == PGM_TYPE_PAE
289	pWalk->Core.fEffectiveNX = !(fEffective & 1) && GST_IS_NX_ACTIVE(pVCpu);
290	# else
291	pWalk->Core.fEffectiveNX = false;
292	# endif
293	pWalk->Core.fSucceeded = true;
294
295	pWalk->Core.GCPhys = GST_GET_PDE_GCPHYS(Pte)
296	\| (GCPtr & PAGE_OFFSET_MASK);
297	return VINF_SUCCESS;
298	}
299	}
300
301	#endif /* 32BIT, PAE, AMD64 */
302
303	/**
304	* Gets effective Guest OS page information.
305	*
306	* When GCPtr is in a big page, the function will return as if it was a normal
307	* 4KB page. If the need for distinguishing between big and normal page becomes
308	* necessary at a later point, a PGMGstGetPage Ex() will be created for that
309	* purpose.
310	*
311	* @returns VBox status code.
312	* @param pVCpu The cross context virtual CPU structure.
313	* @param GCPtr Guest Context virtual address of the page.
314	* @param pfFlags Where to store the flags. These are X86_PTE_*, even for big pages.
315	* @param pGCPhys Where to store the GC physical address of the page.
316	* This is page aligned!
317	*/
318	PGM_GST_DECL(int, GetPage)(PVMCPUCC pVCpu, RTGCPTR GCPtr, uint64_t *pfFlags, PRTGCPHYS pGCPhys)
319	{
320	#if PGM_GST_TYPE == PGM_TYPE_REAL \
321	\|\| PGM_GST_TYPE == PGM_TYPE_PROT
322	/*
323	* Fake it.
324	*/
325	if (pfFlags)
326	*pfFlags = X86_PTE_P \| X86_PTE_RW \| X86_PTE_US;
327	if (pGCPhys)
328	*pGCPhys = GCPtr & PAGE_BASE_GC_MASK;
329	NOREF(pVCpu);
330	return VINF_SUCCESS;
331
332	#elif PGM_GST_TYPE == PGM_TYPE_32BIT \
333	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
334	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
335
336	GSTPTWALK Walk;
337	int rc = PGM_GST_NAME(Walk)(pVCpu, GCPtr, &Walk);
338	if (RT_FAILURE(rc))
339	return rc;
340
341	if (pGCPhys)
342	*pGCPhys = Walk.Core.GCPhys & ~(RTGCPHYS)PAGE_OFFSET_MASK;
343
344	if (pfFlags)
345	{
346	if (!Walk.Core.fBigPage)
347	pfFlags = (Walk.Pte.u & ~(GST_PTE_PG_MASK \| X86_PTE_RW \| X86_PTE_US)) / NX not needed */
348	\| (Walk.Core.fEffectiveRW ? X86_PTE_RW : 0)
349	\| (Walk.Core.fEffectiveUS ? X86_PTE_US : 0)
350	# if PGM_WITH_NX(PGM_GST_TYPE, PGM_GST_TYPE)
351	\| (Walk.Core.fEffectiveNX ? X86_PTE_PAE_NX : 0)
352	# endif
353	;
354	else
355	{
356	pfFlags = (Walk.Pde.u & ~(GST_PTE_PG_MASK \| X86_PDE4M_RW \| X86_PDE4M_US \| X86_PDE4M_PS)) / NX not needed */
357	\| ((Walk.Pde.u & X86_PDE4M_PAT) >> X86_PDE4M_PAT_SHIFT)
358	\| (Walk.Core.fEffectiveRW ? X86_PTE_RW : 0)
359	\| (Walk.Core.fEffectiveUS ? X86_PTE_US : 0)
360	# if PGM_WITH_NX(PGM_GST_TYPE, PGM_GST_TYPE)
361	\| (Walk.Core.fEffectiveNX ? X86_PTE_PAE_NX : 0)
362	# endif
363	;
364	}
365	}
366
367	return VINF_SUCCESS;
368
369	#else
370	# error "shouldn't be here!"
371	/* something else... */
372	return VERR_NOT_SUPPORTED;
373	#endif
374	}
375
376
377	/**
378	* Modify page flags for a range of pages in the guest's tables
379	*
380	* The existing flags are ANDed with the fMask and ORed with the fFlags.
381	*
382	* @returns VBox status code.
383	* @param pVCpu The cross context virtual CPU structure.
384	* @param GCPtr Virtual address of the first page in the range. Page aligned!
385	* @param cb Size (in bytes) of the page range to apply the modification to. Page aligned!
386	* @param fFlags The OR mask - page flags X86_PTE_*, excluding the page mask of course.
387	* @param fMask The AND mask - page flags X86_PTE_*.
388	*/
389	PGM_GST_DECL(int, ModifyPage)(PVMCPUCC pVCpu, RTGCPTR GCPtr, size_t cb, uint64_t fFlags, uint64_t fMask)
390	{
391	Assert((cb & PAGE_OFFSET_MASK) == 0); RT_NOREF_PV(cb);
392
393	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
394	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
395	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
396	for (;;)
397	{
398	GSTPTWALK Walk;
399	int rc = PGM_GST_NAME(Walk)(pVCpu, GCPtr, &Walk);
400	if (RT_FAILURE(rc))
401	return rc;
402
403	if (!Walk.Core.fBigPage)
404	{
405	/*
406	* 4KB Page table, process
407	*
408	* Walk pages till we're done.
409	*/
410	unsigned iPTE = (GCPtr >> GST_PT_SHIFT) & GST_PT_MASK;
411	while (iPTE < RT_ELEMENTS(Walk.pPt->a))
412	{
413	GSTPTE Pte = Walk.pPt->a[iPTE];
414	Pte.u = (Pte.u & (fMask \| X86_PTE_PAE_PG_MASK))
415	\| (fFlags & ~GST_PTE_PG_MASK);
416	Walk.pPt->a[iPTE] = Pte;
417
418	/* next page */
419	cb -= PAGE_SIZE;
420	if (!cb)
421	return VINF_SUCCESS;
422	GCPtr += PAGE_SIZE;
423	iPTE++;
424	}
425	}
426	else
427	{
428	/*
429	* 2/4MB Page table
430	*/
431	GSTPDE PdeNew;
432	# if PGM_GST_TYPE == PGM_TYPE_32BIT
433	PdeNew.u = (Walk.Pde.u & (fMask \| ((fMask & X86_PTE_PAT) << X86_PDE4M_PAT_SHIFT) \| GST_PDE_BIG_PG_MASK \| X86_PDE4M_PG_HIGH_MASK \| X86_PDE4M_PS))
434	# else
435	PdeNew.u = (Walk.Pde.u & (fMask \| ((fMask & X86_PTE_PAT) << X86_PDE4M_PAT_SHIFT) \| GST_PDE_BIG_PG_MASK \| X86_PDE4M_PS))
436	# endif
437	\| (fFlags & ~GST_PTE_PG_MASK)
438	\| ((fFlags & X86_PTE_PAT) << X86_PDE4M_PAT_SHIFT);
439	*Walk.pPde = PdeNew;
440
441	/* advance */
442	const unsigned cbDone = GST_BIG_PAGE_SIZE - (GCPtr & GST_BIG_PAGE_OFFSET_MASK);
443	if (cbDone >= cb)
444	return VINF_SUCCESS;
445	cb -= cbDone;
446	GCPtr += cbDone;
447	}
448	}
449
450	#else
451	/* real / protected mode: ignore. */
452	NOREF(pVCpu); NOREF(GCPtr); NOREF(fFlags); NOREF(fMask);
453	return VINF_SUCCESS;
454	#endif
455	}
456
457
458	/**
459	* Retrieve guest PDE information.
460	*
461	* @returns VBox status code.
462	* @param pVCpu The cross context virtual CPU structure.
463	* @param GCPtr Guest context pointer.
464	* @param pPDE Pointer to guest PDE structure.
465	*/
466	PGM_GST_DECL(int, GetPDE)(PVMCPUCC pVCpu, RTGCPTR GCPtr, PX86PDEPAE pPDE)
467	{
468	#if PGM_GST_TYPE == PGM_TYPE_32BIT \
469	\|\| PGM_GST_TYPE == PGM_TYPE_PAE \
470	\|\| PGM_GST_TYPE == PGM_TYPE_AMD64
471
472	# if PGM_GST_TYPE != PGM_TYPE_AMD64
473	/* Boundary check. */
474	if (RT_UNLIKELY(GCPtr >= _4G))
475	return VERR_PAGE_TABLE_NOT_PRESENT;
476	# endif
477
478	# if PGM_GST_TYPE == PGM_TYPE_32BIT
479	unsigned iPd = (GCPtr >> GST_PD_SHIFT) & GST_PD_MASK;
480	PX86PD pPd = pgmGstGet32bitPDPtr(pVCpu);
481
482	# elif PGM_GST_TYPE == PGM_TYPE_PAE
483	unsigned iPd = 0; /* shut up gcc */
484	PCX86PDPAE pPd = pgmGstGetPaePDPtr(pVCpu, GCPtr, &iPd, NULL);
485
486	# elif PGM_GST_TYPE == PGM_TYPE_AMD64
487	PX86PML4E pPml4eIgn;
488	X86PDPE PdpeIgn;
489	unsigned iPd = 0; /* shut up gcc */
490	PCX86PDPAE pPd = pgmGstGetLongModePDPtr(pVCpu, GCPtr, &pPml4eIgn, &PdpeIgn, &iPd);
491	/* Note! We do not return an effective PDE here like we do for the PTE in GetPage method. */
492	# endif
493
494	if (RT_LIKELY(pPd))
495	pPDE->u = (X86PGPAEUINT)pPd->a[iPd].u;
496	else
497	pPDE->u = 0;
498	return VINF_SUCCESS;
499
500	#else
501	NOREF(pVCpu); NOREF(GCPtr); NOREF(pPDE);
502	AssertFailed();
503	return VERR_NOT_IMPLEMENTED;
504	#endif
505	}
506
507
508	#ifdef IN_RING3
509	/**
510	* Relocate any GC pointers related to guest mode paging.
511	*
512	* @returns VBox status code.
513	* @param pVCpu The cross context virtual CPU structure.
514	* @param offDelta The relocation offset.
515	*/
516	PGM_GST_DECL(int, Relocate)(PVMCPUCC pVCpu, RTGCPTR offDelta)
517	{
518	RT_NOREF(pVCpu, offDelta);
519	return VINF_SUCCESS;
520	}
521	#endif

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source: vbox/trunk/src/VBox/VMM/VMMAll/PGMAllGst.h@ 88638

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