PGMR0.cpp@ 53349

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1	/* $Id: PGMR0.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor, Ring-0.
4	*/
5
6	/*
7	* Copyright (C) 2007-2012 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/rawpci.h>
23	#include <VBox/vmm/pgm.h>
24	#include <VBox/vmm/gmm.h>
25	#include <VBox/vmm/gvm.h>
26	#include "PGMInternal.h"
27	#include <VBox/vmm/vm.h>
28	#include "PGMInline.h"
29	#include <VBox/log.h>
30	#include <VBox/err.h>
31	#include <iprt/assert.h>
32	#include <iprt/mem.h>
33
34
35	/*
36	* Instantiate the ring-0 header/code templates.
37	*/
38	#define PGM_BTH_NAME(name) PGM_BTH_NAME_32BIT_PROT(name)
39	#include "PGMR0Bth.h"
40	#undef PGM_BTH_NAME
41
42	#define PGM_BTH_NAME(name) PGM_BTH_NAME_PAE_PROT(name)
43	#include "PGMR0Bth.h"
44	#undef PGM_BTH_NAME
45
46	#define PGM_BTH_NAME(name) PGM_BTH_NAME_AMD64_PROT(name)
47	#include "PGMR0Bth.h"
48	#undef PGM_BTH_NAME
49
50	#define PGM_BTH_NAME(name) PGM_BTH_NAME_EPT_PROT(name)
51	#include "PGMR0Bth.h"
52	#undef PGM_BTH_NAME
53
54
55	/**
56	* Worker function for PGMR3PhysAllocateHandyPages and pgmPhysEnsureHandyPage.
57	*
58	* @returns The following VBox status codes.
59	* @retval VINF_SUCCESS on success. FF cleared.
60	* @retval VINF_EM_NO_MEMORY if we're out of memory. The FF is set in this case.
61	*
62	* @param pVM Pointer to the VM.
63	* @param pVCpu Pointer to the VMCPU.
64	*
65	* @remarks Must be called from within the PGM critical section. The caller
66	* must clear the new pages.
67	*/
68	VMMR0_INT_DECL(int) PGMR0PhysAllocateHandyPages(PVM pVM, PVMCPU pVCpu)
69	{
70	PGM_LOCK_ASSERT_OWNER_EX(pVM, pVCpu);
71
72	/*
73	* Check for error injection.
74	*/
75	if (RT_UNLIKELY(pVM->pgm.s.fErrInjHandyPages))
76	return VERR_NO_MEMORY;
77
78	/*
79	* Try allocate a full set of handy pages.
80	*/
81	uint32_t iFirst = pVM->pgm.s.cHandyPages;
82	AssertReturn(iFirst <= RT_ELEMENTS(pVM->pgm.s.aHandyPages), VERR_PGM_HANDY_PAGE_IPE);
83	uint32_t cPages = RT_ELEMENTS(pVM->pgm.s.aHandyPages) - iFirst;
84	if (!cPages)
85	return VINF_SUCCESS;
86	int rc = GMMR0AllocateHandyPages(pVM, pVCpu->idCpu, cPages, cPages, &pVM->pgm.s.aHandyPages[iFirst]);
87	if (RT_SUCCESS(rc))
88	{
89	#ifdef VBOX_STRICT
90	for (uint32_t i = 0; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
91	{
92	Assert(pVM->pgm.s.aHandyPages[i].idPage != NIL_GMM_PAGEID);
93	Assert(pVM->pgm.s.aHandyPages[i].idPage <= GMM_PAGEID_LAST);
94	Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
95	Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys != NIL_RTHCPHYS);
96	Assert(!(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
97	}
98	#endif
99
100	pVM->pgm.s.cHandyPages = RT_ELEMENTS(pVM->pgm.s.aHandyPages);
101	}
102	else if (rc != VERR_GMM_SEED_ME)
103	{
104	if ( ( rc == VERR_GMM_HIT_GLOBAL_LIMIT
105	\|\| rc == VERR_GMM_HIT_VM_ACCOUNT_LIMIT)
106	&& iFirst < PGM_HANDY_PAGES_MIN)
107	{
108
109	#ifdef VBOX_STRICT
110	/* We're ASSUMING that GMM has updated all the entires before failing us. */
111	uint32_t i;
112	for (i = iFirst; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
113	{
114	Assert(pVM->pgm.s.aHandyPages[i].idPage == NIL_GMM_PAGEID);
115	Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
116	Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys == NIL_RTHCPHYS);
117	}
118	#endif
119
120	/*
121	* Reduce the number of pages until we hit the minimum limit.
122	*/
123	do
124	{
125	cPages >>= 1;
126	if (cPages + iFirst < PGM_HANDY_PAGES_MIN)
127	cPages = PGM_HANDY_PAGES_MIN - iFirst;
128	rc = GMMR0AllocateHandyPages(pVM, pVCpu->idCpu, 0, cPages, &pVM->pgm.s.aHandyPages[iFirst]);
129	} while ( ( rc == VERR_GMM_HIT_GLOBAL_LIMIT
130	\|\| rc == VERR_GMM_HIT_VM_ACCOUNT_LIMIT)
131	&& cPages + iFirst > PGM_HANDY_PAGES_MIN);
132	if (RT_SUCCESS(rc))
133	{
134	#ifdef VBOX_STRICT
135	i = iFirst + cPages;
136	while (i-- > 0)
137	{
138	Assert(pVM->pgm.s.aHandyPages[i].idPage != NIL_GMM_PAGEID);
139	Assert(pVM->pgm.s.aHandyPages[i].idPage <= GMM_PAGEID_LAST);
140	Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
141	Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys != NIL_RTHCPHYS);
142	Assert(!(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
143	}
144
145	for (i = cPages + iFirst; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
146	{
147	Assert(pVM->pgm.s.aHandyPages[i].idPage == NIL_GMM_PAGEID);
148	Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
149	Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys == NIL_RTHCPHYS);
150	}
151	#endif
152
153	pVM->pgm.s.cHandyPages = iFirst + cPages;
154	}
155	}
156
157	if (RT_FAILURE(rc) && rc != VERR_GMM_SEED_ME)
158	{
159	LogRel(("PGMR0PhysAllocateHandyPages: rc=%Rrc iFirst=%d cPages=%d\n", rc, iFirst, cPages));
160	VM_FF_SET(pVM, VM_FF_PGM_NO_MEMORY);
161	}
162	}
163
164
165	LogFlow(("PGMR0PhysAllocateHandyPages: cPages=%d rc=%Rrc\n", cPages, rc));
166	return rc;
167	}
168
169
170	/**
171	* Flushes any changes pending in the handy page array.
172	*
173	* It is very important that this gets done when page sharing is enabled.
174	*
175	* @returns The following VBox status codes.
176	* @retval VINF_SUCCESS on success. FF cleared.
177	*
178	* @param pVM Pointer to the VM.
179	* @param pVCpu Pointer to the VMCPU.
180	*
181	* @remarks Must be called from within the PGM critical section.
182	*/
183	VMMR0_INT_DECL(int) PGMR0PhysFlushHandyPages(PVM pVM, PVMCPU pVCpu)
184	{
185	PGM_LOCK_ASSERT_OWNER_EX(pVM, pVCpu);
186
187	/*
188	* Try allocate a full set of handy pages.
189	*/
190	uint32_t iFirst = pVM->pgm.s.cHandyPages;
191	AssertReturn(iFirst <= RT_ELEMENTS(pVM->pgm.s.aHandyPages), VERR_PGM_HANDY_PAGE_IPE);
192	uint32_t cPages = RT_ELEMENTS(pVM->pgm.s.aHandyPages) - iFirst;
193	if (!cPages)
194	return VINF_SUCCESS;
195	int rc = GMMR0AllocateHandyPages(pVM, pVCpu->idCpu, cPages, 0, &pVM->pgm.s.aHandyPages[iFirst]);
196
197	LogFlow(("PGMR0PhysFlushHandyPages: cPages=%d rc=%Rrc\n", cPages, rc));
198	return rc;
199	}
200
201
202	/**
203	* Worker function for PGMR3PhysAllocateLargeHandyPage
204	*
205	* @returns The following VBox status codes.
206	* @retval VINF_SUCCESS on success.
207	* @retval VINF_EM_NO_MEMORY if we're out of memory.
208	*
209	* @param pVM Pointer to the VM.
210	* @param pVCpu Pointer to the VMCPU.
211	*
212	* @remarks Must be called from within the PGM critical section. The caller
213	* must clear the new pages.
214	*/
215	VMMR0_INT_DECL(int) PGMR0PhysAllocateLargeHandyPage(PVM pVM, PVMCPU pVCpu)
216	{
217	PGM_LOCK_ASSERT_OWNER_EX(pVM, pVCpu);
218	Assert(!pVM->pgm.s.cLargeHandyPages);
219
220	int rc = GMMR0AllocateLargePage(pVM, pVCpu->idCpu, _2M,
221	&pVM->pgm.s.aLargeHandyPage[0].idPage,
222	&pVM->pgm.s.aLargeHandyPage[0].HCPhysGCPhys);
223	if (RT_SUCCESS(rc))
224	pVM->pgm.s.cLargeHandyPages = 1;
225
226	return rc;
227	}
228
229
230	#ifdef VBOX_WITH_PCI_PASSTHROUGH
231	/* Interface sketch. The interface belongs to a global PCI pass-through
232	manager. It shall use the global VM handle, not the user VM handle to
233	store the per-VM info (domain) since that is all ring-0 stuff, thus
234	passing pGVM here. I've tentitively prefixed the functions 'GPciRawR0',
235	we can discuss the PciRaw code re-organtization when I'm back from
236	vacation.
237
238	I've implemented the initial IOMMU set up below. For things to work
239	reliably, we will probably need add a whole bunch of checks and
240	GPciRawR0GuestPageUpdate call to the PGM code. For the present,
241	assuming nested paging (enforced) and prealloc (enforced), no
242	ballooning (check missing), page sharing (check missing) or live
243	migration (check missing), it might work fine. At least if some
244	VM power-off hook is present and can tear down the IOMMU page tables. */
245
246	/**
247	* Tells the global PCI pass-through manager that we are about to set up the
248	* guest page to host page mappings for the specfied VM.
249	*
250	* @returns VBox status code.
251	*
252	* @param pGVM The ring-0 VM structure.
253	*/
254	VMMR0_INT_DECL(int) GPciRawR0GuestPageBeginAssignments(PGVM pGVM)
255	{
256	NOREF(pGVM);
257	return VINF_SUCCESS;
258	}
259
260
261	/**
262	* Assigns a host page mapping for a guest page.
263	*
264	* This is only used when setting up the mappings, i.e. between
265	* GPciRawR0GuestPageBeginAssignments and GPciRawR0GuestPageEndAssignments.
266	*
267	* @returns VBox status code.
268	* @param pGVM The ring-0 VM structure.
269	* @param GCPhys The address of the guest page (page aligned).
270	* @param HCPhys The address of the host page (page aligned).
271	*/
272	VMMR0_INT_DECL(int) GPciRawR0GuestPageAssign(PGVM pGVM, RTGCPHYS GCPhys, RTHCPHYS HCPhys)
273	{
274	AssertReturn(!(GCPhys & PAGE_OFFSET_MASK), VERR_INTERNAL_ERROR_3);
275	AssertReturn(!(HCPhys & PAGE_OFFSET_MASK), VERR_INTERNAL_ERROR_3);
276
277	if (pGVM->rawpci.s.pfnContigMemInfo)
278	/** @todo: what do we do on failure? */
279	pGVM->rawpci.s.pfnContigMemInfo(&pGVM->rawpci.s, HCPhys, GCPhys, PAGE_SIZE, PCIRAW_MEMINFO_MAP);
280
281	return VINF_SUCCESS;
282	}
283
284
285	/**
286	* Indicates that the specified guest page doesn't exists but doesn't have host
287	* page mapping we trust PCI pass-through with.
288	*
289	* This is only used when setting up the mappings, i.e. between
290	* GPciRawR0GuestPageBeginAssignments and GPciRawR0GuestPageEndAssignments.
291	*
292	* @returns VBox status code.
293	* @param pGVM The ring-0 VM structure.
294	* @param GCPhys The address of the guest page (page aligned).
295	* @param HCPhys The address of the host page (page aligned).
296	*/
297	VMMR0_INT_DECL(int) GPciRawR0GuestPageUnassign(PGVM pGVM, RTGCPHYS GCPhys)
298	{
299	AssertReturn(!(GCPhys & PAGE_OFFSET_MASK), VERR_INTERNAL_ERROR_3);
300
301	if (pGVM->rawpci.s.pfnContigMemInfo)
302	/** @todo: what do we do on failure? */
303	pGVM->rawpci.s.pfnContigMemInfo(&pGVM->rawpci.s, 0, GCPhys, PAGE_SIZE, PCIRAW_MEMINFO_UNMAP);
304
305	return VINF_SUCCESS;
306	}
307
308
309	/**
310	* Tells the global PCI pass-through manager that we have completed setting up
311	* the guest page to host page mappings for the specfied VM.
312	*
313	* This complements GPciRawR0GuestPageBeginAssignments and will be called even
314	* if some page assignment failed.
315	*
316	* @returns VBox status code.
317	*
318	* @param pGVM The ring-0 VM structure.
319	*/
320	VMMR0_INT_DECL(int) GPciRawR0GuestPageEndAssignments(PGVM pGVM)
321	{
322	NOREF(pGVM);
323	return VINF_SUCCESS;
324	}
325
326
327	/**
328	* Tells the global PCI pass-through manager that a guest page mapping has
329	* changed after the initial setup.
330	*
331	* @returns VBox status code.
332	* @param pGVM The ring-0 VM structure.
333	* @param GCPhys The address of the guest page (page aligned).
334	* @param HCPhys The new host page address or NIL_RTHCPHYS if
335	* now unassigned.
336	*/
337	VMMR0_INT_DECL(int) GPciRawR0GuestPageUpdate(PGVM pGVM, RTGCPHYS GCPhys, RTHCPHYS HCPhys)
338	{
339	AssertReturn(!(GCPhys & PAGE_OFFSET_MASK), VERR_INTERNAL_ERROR_4);
340	AssertReturn(!(HCPhys & PAGE_OFFSET_MASK) \|\| HCPhys == NIL_RTHCPHYS, VERR_INTERNAL_ERROR_4);
341	NOREF(pGVM);
342	return VINF_SUCCESS;
343	}
344
345	#endif /* VBOX_WITH_PCI_PASSTHROUGH */
346
347
348	/**
349	* Sets up the IOMMU when raw PCI device is enabled.
350	*
351	* @note This is a hack that will probably be remodelled and refined later!
352	*
353	* @returns VBox status code.
354	*
355	* @param pVM Pointer to the VM.
356	*/
357	VMMR0_INT_DECL(int) PGMR0PhysSetupIommu(PVM pVM)
358	{
359	PGVM pGVM;
360	int rc = GVMMR0ByVM(pVM, &pGVM);
361	if (RT_FAILURE(rc))
362	return rc;
363
364	#ifdef VBOX_WITH_PCI_PASSTHROUGH
365	if (pVM->pgm.s.fPciPassthrough)
366	{
367	/*
368	* The Simplistic Approach - Enumerate all the pages and call tell the
369	* IOMMU about each of them.
370	*/
371	pgmLock(pVM);
372	rc = GPciRawR0GuestPageBeginAssignments(pGVM);
373	if (RT_SUCCESS(rc))
374	{
375	for (PPGMRAMRANGE pRam = pVM->pgm.s.pRamRangesXR0; RT_SUCCESS(rc) && pRam; pRam = pRam->pNextR0)
376	{
377	PPGMPAGE pPage = &pRam->aPages[0];
378	RTGCPHYS GCPhys = pRam->GCPhys;
379	uint32_t cLeft = pRam->cb >> PAGE_SHIFT;
380	while (cLeft-- > 0)
381	{
382	/* Only expose pages that are 100% safe for now. */
383	if ( PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM
384	&& PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
385	&& !PGM_PAGE_HAS_ANY_HANDLERS(pPage))
386	rc = GPciRawR0GuestPageAssign(pGVM, GCPhys, PGM_PAGE_GET_HCPHYS(pPage));
387	else
388	rc = GPciRawR0GuestPageUnassign(pGVM, GCPhys);
389
390	/* next */
391	pPage++;
392	GCPhys += PAGE_SIZE;
393	}
394	}
395
396	int rc2 = GPciRawR0GuestPageEndAssignments(pGVM);
397	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
398	rc = rc2;
399	}
400	pgmUnlock(pVM);
401	}
402	else
403	#endif
404	rc = VERR_NOT_SUPPORTED;
405	return rc;
406	}
407
408
409	/**
410	* #PF Handler for nested paging.
411	*
412	* @returns VBox status code (appropriate for trap handling and GC return).
413	* @param pVM Pointer to the VM.
414	* @param pVCpu Pointer to the VMCPU.
415	* @param enmShwPagingMode Paging mode for the nested page tables.
416	* @param uErr The trap error code.
417	* @param pRegFrame Trap register frame.
418	* @param GCPhysFault The fault address.
419	*/
420	VMMR0DECL(int) PGMR0Trap0eHandlerNestedPaging(PVM pVM, PVMCPU pVCpu, PGMMODE enmShwPagingMode, RTGCUINT uErr,
421	PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault)
422	{
423	int rc;
424
425	LogFlow(("PGMTrap0eHandler: uErr=%RGx GCPhysFault=%RGp eip=%RGv\n", uErr, GCPhysFault, (RTGCPTR)pRegFrame->rip));
426	STAM_PROFILE_START(&pVCpu->pgm.s.StatRZTrap0e, a);
427	STAM_STATS({ pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution) = NULL; } );
428
429	/* AMD uses the host's paging mode; Intel has a single mode (EPT). */
430	AssertMsg( enmShwPagingMode == PGMMODE_32_BIT \|\| enmShwPagingMode == PGMMODE_PAE \|\| enmShwPagingMode == PGMMODE_PAE_NX
431	\|\| enmShwPagingMode == PGMMODE_AMD64 \|\| enmShwPagingMode == PGMMODE_AMD64_NX \|\| enmShwPagingMode == PGMMODE_EPT,
432	("enmShwPagingMode=%d\n", enmShwPagingMode));
433
434	/* Reserved shouldn't end up here. */
435	Assert(!(uErr & X86_TRAP_PF_RSVD));
436
437	#ifdef VBOX_WITH_STATISTICS
438	/*
439	* Error code stats.
440	*/
441	if (uErr & X86_TRAP_PF_US)
442	{
443	if (!(uErr & X86_TRAP_PF_P))
444	{
445	if (uErr & X86_TRAP_PF_RW)
446	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSNotPresentWrite);
447	else
448	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSNotPresentRead);
449	}
450	else if (uErr & X86_TRAP_PF_RW)
451	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSWrite);
452	else if (uErr & X86_TRAP_PF_RSVD)
453	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSReserved);
454	else if (uErr & X86_TRAP_PF_ID)
455	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSNXE);
456	else
457	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eUSRead);
458	}
459	else
460	{ /* Supervisor */
461	if (!(uErr & X86_TRAP_PF_P))
462	{
463	if (uErr & X86_TRAP_PF_RW)
464	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eSVNotPresentWrite);
465	else
466	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eSVNotPresentRead);
467	}
468	else if (uErr & X86_TRAP_PF_RW)
469	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eSVWrite);
470	else if (uErr & X86_TRAP_PF_ID)
471	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eSNXE);
472	else if (uErr & X86_TRAP_PF_RSVD)
473	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eSVReserved);
474	}
475	#endif
476
477	/*
478	* Call the worker.
479	*
480	* Note! We pretend the guest is in protected mode without paging, so we
481	* can use existing code to build the nested page tables.
482	*/
483	bool fLockTaken = false;
484	switch (enmShwPagingMode)
485	{
486	case PGMMODE_32_BIT:
487	rc = PGM_BTH_NAME_32BIT_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, GCPhysFault, &fLockTaken);
488	break;
489	case PGMMODE_PAE:
490	case PGMMODE_PAE_NX:
491	rc = PGM_BTH_NAME_PAE_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, GCPhysFault, &fLockTaken);
492	break;
493	case PGMMODE_AMD64:
494	case PGMMODE_AMD64_NX:
495	rc = PGM_BTH_NAME_AMD64_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, GCPhysFault, &fLockTaken);
496	break;
497	case PGMMODE_EPT:
498	rc = PGM_BTH_NAME_EPT_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, GCPhysFault, &fLockTaken);
499	break;
500	default:
501	AssertFailed();
502	rc = VERR_INVALID_PARAMETER;
503	break;
504	}
505	if (fLockTaken)
506	{
507	PGM_LOCK_ASSERT_OWNER(pVM);
508	pgmUnlock(pVM);
509	}
510
511	if (rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE)
512	rc = VINF_SUCCESS;
513	/*
514	* Handle the case where we cannot interpret the instruction because we cannot get the guest physical address
515	* via its page tables, see @bugref{6043}.
516	*/
517	else if ( rc == VERR_PAGE_NOT_PRESENT /* SMP only ; disassembly might fail. */
518	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT /* seen with UNI & SMP */
519	\|\| rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT /* seen with SMP */
520	\|\| rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT) /* precaution */
521	{
522	Log(("WARNING: Unexpected VERR_PAGE_TABLE_NOT_PRESENT (%d) for page fault at %RGp error code %x (rip=%RGv)\n", rc, GCPhysFault, uErr, pRegFrame->rip));
523	/* Some kind of inconsistency in the SMP case; it's safe to just execute the instruction again; not sure about
524	single VCPU VMs though. */
525	rc = VINF_SUCCESS;
526	}
527
528	STAM_STATS({ if (!pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution))
529	pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution) = &pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0eTime2Misc; });
530	STAM_PROFILE_STOP_EX(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatRZTrap0e, pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution), a);
531	return rc;
532	}
533
534
535	/**
536	* #PF Handler for deliberate nested paging misconfiguration (/reserved bit)
537	* employed for MMIO pages.
538	*
539	* @returns VBox status code (appropriate for trap handling and GC return).
540	* @param pVM Pointer to the VM.
541	* @param pVCpu Pointer to the VMCPU.
542	* @param enmShwPagingMode Paging mode for the nested page tables.
543	* @param pRegFrame Trap register frame.
544	* @param GCPhysFault The fault address.
545	* @param uErr The error code, UINT32_MAX if not available
546	* (VT-x).
547	*/
548	VMMR0DECL(VBOXSTRICTRC) PGMR0Trap0eHandlerNPMisconfig(PVM pVM, PVMCPU pVCpu, PGMMODE enmShwPagingMode,
549	PCPUMCTXCORE pRegFrame, RTGCPHYS GCPhysFault, uint32_t uErr)
550	{
551	#ifdef PGM_WITH_MMIO_OPTIMIZATIONS
552	STAM_PROFILE_START(&pVCpu->CTX_SUFF(pStats)->StatR0NpMiscfg, a);
553	VBOXSTRICTRC rc;
554
555	/*
556	* Try lookup the all access physical handler for the address.
557	*/
558	pgmLock(pVM);
559	PPGMPHYSHANDLER pHandler = pgmHandlerPhysicalLookup(pVM, GCPhysFault);
560	if (RT_LIKELY(pHandler && pHandler->enmType != PGMPHYSHANDLERTYPE_PHYSICAL_WRITE))
561	{
562	/*
563	* If the handle has aliases page or pages that have been temporarily
564	* disabled, we'll have to take a detour to make sure we resync them
565	* to avoid lots of unnecessary exits.
566	*/
567	PPGMPAGE pPage;
568	if ( ( pHandler->cAliasedPages
569	\|\| pHandler->cTmpOffPages)
570	&& ( (pPage = pgmPhysGetPage(pVM, GCPhysFault)) == NULL
571	\|\| PGM_PAGE_GET_HNDL_PHYS_STATE(pPage) == PGM_PAGE_HNDL_PHYS_STATE_DISABLED)
572	)
573	{
574	Log(("PGMR0Trap0eHandlerNPMisconfig: Resyncing aliases / tmp-off page at %RGp (uErr=%#x) %R[pgmpage]\n", GCPhysFault, uErr, pPage));
575	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatR0NpMiscfgSyncPage);
576	rc = pgmShwSyncNestedPageLocked(pVCpu, GCPhysFault, 1 /cPages/, enmShwPagingMode);
577	pgmUnlock(pVM);
578	}
579	else
580	{
581	if (pHandler->CTX_SUFF(pfnHandler))
582	{
583	CTX_MID(PFNPGM,PHYSHANDLER) pfnHandler = pHandler->CTX_SUFF(pfnHandler);
584	void *pvUser = pHandler->CTX_SUFF(pvUser);
585	STAM_PROFILE_START(&pHandler->Stat, h);
586	pgmUnlock(pVM);
587
588	Log6(("PGMR0Trap0eHandlerNPMisconfig: calling %p(,%#x,,%RGp,%p)\n", pfnHandler, uErr, GCPhysFault, pvUser));
589	rc = pfnHandler(pVM, uErr == UINT32_MAX ? RTGCPTR_MAX : uErr, pRegFrame, GCPhysFault, GCPhysFault, pvUser);
590
591	#ifdef VBOX_WITH_STATISTICS
592	pgmLock(pVM);
593	pHandler = pgmHandlerPhysicalLookup(pVM, GCPhysFault);
594	if (pHandler)
595	STAM_PROFILE_STOP(&pHandler->Stat, h);
596	pgmUnlock(pVM);
597	#endif
598	}
599	else
600	{
601	pgmUnlock(pVM);
602	Log(("PGMR0Trap0eHandlerNPMisconfig: %RGp (uErr=%#x) -> R3\n", GCPhysFault, uErr));
603	rc = VINF_EM_RAW_EMULATE_INSTR;
604	}
605	}
606	}
607	else
608	{
609	/*
610	* Must be out of sync, so do a SyncPage and restart the instruction.
611	*
612	* ASSUMES that ALL handlers are page aligned and covers whole pages
613	* (assumption asserted in PGMHandlerPhysicalRegisterEx).
614	*/
615	Log(("PGMR0Trap0eHandlerNPMisconfig: Out of sync page at %RGp (uErr=%#x)\n", GCPhysFault, uErr));
616	STAM_COUNTER_INC(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatR0NpMiscfgSyncPage);
617	rc = pgmShwSyncNestedPageLocked(pVCpu, GCPhysFault, 1 /cPages/, enmShwPagingMode);
618	pgmUnlock(pVM);
619	}
620
621	STAM_PROFILE_STOP(&pVCpu->pgm.s.CTX_SUFF(pStats)->StatR0NpMiscfg, a);
622	return rc;
623
624	#else
625	AssertLogRelFailed();
626	return VERR_PGM_NOT_USED_IN_MODE;
627	#endif
628	}
629

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source: vbox/trunk/src/VBox/VMM/VMMR0/PGMR0.cpp@ 53349

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