MM.cpp@ 6674

Last change on this file since 6674 was 6634, checked in by vboxsync, 17 years ago
fixes to new (disabled) code.
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1	/* $Id: MM.cpp 6634 2008-01-30 21:41:24Z vboxsync $ */
2	/** @file
3	* MM - Memory Monitor(/Manager).
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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	/** @page pg_mm MM - The Memory Monitor/Manager
20	*
21	* WARNING: THIS IS SOMEWHAT OUTDATED!
22	*
23	* It seems like this is going to be the entity taking care of memory allocations
24	* and the locking of physical memory for a VM. MM will track these allocations and
25	* pinnings so pointer conversions, memory read and write, and correct clean up can
26	* be done.
27	*
28	* Memory types:
29	* - Hypervisor Memory Area (HMA).
30	* - Page tables.
31	* - Physical pages.
32	*
33	* The first two types are not accessible using the generic conversion functions
34	* for GC memory, there are special functions for these.
35	*
36	*
37	* A decent structure for this component need to be eveloped as we see usage. One
38	* or two rewrites is probabaly needed to get it right...
39	*
40	*
41	*
42	* @section Hypervisor Memory Area
43	*
44	* The hypervisor is give 4MB of space inside the guest, we assume that we can
45	* steal an page directory entry from the guest OS without cause trouble. In
46	* addition to these 4MB we'll be mapping memory for the graphics emulation,
47	* but that will be an independant mapping.
48	*
49	* The 4MBs are divided into two main parts:
50	* -# The static code and data
51	* -# The shortlived page mappings.
52	*
53	* The first part is used for the VM structure, the core code (VMMSwitch),
54	* GC modules, and the alloc-only-heap. The size will be determined at a
55	* later point but initially we'll say 2MB of locked memory, most of which
56	* is non contiguous physically.
57	*
58	* The second part is used for mapping pages to the hypervisor. We'll be using
59	* a simple round robin when doing these mappings. This means that no-one can
60	* assume that a mapping hangs around for very long, while the managing of the
61	* pages are very simple.
62	*
63	*
64	*
65	* @section Page Pool
66	*
67	* The MM manages a per VM page pool from which other components can allocate
68	* locked, page aligned and page granular memory objects. The pool provides
69	* facilities to convert back and forth between physical and virtual addresses
70	* (within the pool of course). Several specialized interfaces are provided
71	* for the most common alloctions and convertions to save the caller from
72	* bothersome casting and extra parameter passing.
73	*
74	*
75	*/
76
77
78
79	/*******************************************************************************
80	* Header Files *
81	*******************************************************************************/
82	#define LOG_GROUP LOG_GROUP_MM
83	#include <VBox/mm.h>
84	#include <VBox/pgm.h>
85	#include <VBox/cfgm.h>
86	#include <VBox/ssm.h>
87	#include <VBox/gmm.h>
88	#include "MMInternal.h"
89	#include <VBox/vm.h>
90	#include <VBox/err.h>
91	#include <VBox/param.h>
92
93	#include <VBox/log.h>
94	#include <iprt/alloc.h>
95	#include <iprt/assert.h>
96	#include <iprt/string.h>
97
98
99	/*******************************************************************************
100	* Defined Constants And Macros *
101	*******************************************************************************/
102	/** The current saved state versino of MM. */
103	#define MM_SAVED_STATE_VERSION 2
104
105
106	/*******************************************************************************
107	* Internal Functions *
108	*******************************************************************************/
109	static int mmR3Term(PVM pVM, bool fKeepTheHeap);
110	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM);
111	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
112
113
114
115	/**
116	* Initializes the MM.
117	*
118	* MM is managing the virtual address space (among other things) and
119	* setup the hypvervisor memory area mapping in the VM structure and
120	* the hypvervisor alloc-only-heap. Assuming the current init order
121	* and components the hypvervisor memory area looks like this:
122	* -# VM Structure.
123	* -# Hypervisor alloc only heap (also call Hypervisor memory region).
124	* -# Core code.
125	*
126	* MM determins the virtual address of the hypvervisor memory area by
127	* checking for location at previous run. If that property isn't available
128	* it will choose a default starting location, currently 0xe0000000.
129	*
130	* @returns VBox status code.
131	* @param pVM The VM to operate on.
132	*/
133	MMR3DECL(int) MMR3Init(PVM pVM)
134	{
135	LogFlow(("MMR3Init\n"));
136
137	/*
138	* Assert alignment, sizes and order.
139	*/
140	AssertRelease(!(RT_OFFSETOF(VM, mm.s) & 31));
141	AssertRelease(sizeof(pVM->mm.s) <= sizeof(pVM->mm.padding));
142	AssertMsg(pVM->mm.s.offVM == 0, ("Already initialized!\n"));
143
144	/*
145	* Init the structure.
146	*/
147	pVM->mm.s.offVM = RT_OFFSETOF(VM, mm);
148	pVM->mm.s.offLookupHyper = NIL_OFFSET;
149
150	/*
151	* Init the heap (may already be initialized already if someone used it).
152	*/
153	if (!pVM->mm.s.pHeap)
154	{
155	int rc = mmR3HeapCreate(pVM, &pVM->mm.s.pHeap);
156	if (!VBOX_SUCCESS(rc))
157	return rc;
158	}
159
160	/*
161	* Init the page pool.
162	*/
163	int rc = mmR3PagePoolInit(pVM);
164	if (VBOX_SUCCESS(rc))
165	{
166	/*
167	* Init the hypervisor related stuff.
168	*/
169	rc = mmR3HyperInit(pVM);
170	if (VBOX_SUCCESS(rc))
171	{
172	/*
173	* Register the saved state data unit.
174	*/
175	rc = SSMR3RegisterInternal(pVM, "mm", 1, MM_SAVED_STATE_VERSION, sizeof(uint32_t) * 2,
176	NULL, mmR3Save, NULL,
177	NULL, mmR3Load, NULL);
178	if (VBOX_SUCCESS(rc))
179	return rc;
180
181	/* .... failure .... */
182	}
183	}
184	mmR3Term(pVM, true /* keep the heap */);
185	return rc;
186	}
187
188
189	/**
190	* Initializes the MM parts which depends on PGM being initialized.
191	*
192	* @returns VBox status code.
193	* @param pVM The VM to operate on.
194	* @remark No cleanup necessary since MMR3Term() will be called on failure.
195	*/
196	MMR3DECL(int) MMR3InitPaging(PVM pVM)
197	{
198	LogFlow(("MMR3InitPaging:\n"));
199
200	/*
201	* Query the CFGM values.
202	*/
203	int rc;
204	PCFGMNODE pMMCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "MM");
205	if (pMMCfg)
206	{
207	rc = CFGMR3InsertNode(CFGMR3GetRoot(pVM), "MM", &pMMCfg);
208	AssertRCReturn(rc, rc);
209	}
210
211	/** @cfgm{RamPreAlloc, boolean, false}
212	* Indicates whether the base RAM should all be allocated before starting
213	* the VM (default), or if it should be allocated when first written to.
214	*/
215	bool fPreAlloc;
216	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "RamPreAlloc", &fPreAlloc);
217	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
218	fPreAlloc = false;
219	else
220	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamPreAlloc\", rc=%Vrc.\n", rc), rc);
221
222	/** @cfgm{RamSize, uint64_t, 0, 0, UINT64_MAX}
223	* Specifies the size of the base RAM that is to be set up during
224	* VM initialization.
225	*/
226	uint64_t cbRam;
227	rc = CFGMR3QueryU64(CFGMR3GetRoot(pVM), "RamSize", &cbRam);
228	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
229	cbRam = 0;
230	else
231	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamSize\", rc=%Vrc.\n", rc), rc);
232
233	cbRam &= X86_PTE_PAE_PG_MASK;
234	pVM->mm.s.cbRamBase = cbRam; /* Warning: don't move this code to MMR3Init without fixing REMR3Init. */
235	Log(("MM: %RU64 bytes of RAM%s\n", cbRam, fPreAlloc ? " (PreAlloc)" : ""));
236
237	#ifdef VBOX_WITH_NEW_PHYS_CODE
238	/** @cfgm{MM/Policy, string, no overcommitment}
239	* Specifies the policy to use when reserving memory for this VM. The recognized
240	* value is 'no overcommitment' (default). See GMMPOLICY.
241	*/
242	GMMOCPOLICY enmPolicy;
243	char sz[64];
244	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Policy", sz, sizeof(sz));
245	if (RT_SUCCESS(rc))
246	{
247	if ( !RTStrICmp(sz, "no_oc")
248	\|\| !RTStrICmp(sz, "no overcommitment"))
249	enmPolicy = GMMOCPOLICY_NO_OC;
250	else
251	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Policy\" value \"%s\"", sz);
252	}
253	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
254	enmPolicy = GMMOCPOLICY_NO_OC;
255	else
256	AssertMsgRCReturn(rc, ("Configuration error: Failed to query string \"MM/Policy\", rc=%Vrc.\n", rc), rc);
257
258	/** @cfgm{MM/Priority, string, normal}
259	* Specifies the memory priority of this VM. The priority comes into play when the
260	* system is overcommitted and the VMs needs to be milked for memory. The recognized
261	* values are 'low', 'normal' (default) and 'high'. See GMMPRIORITY.
262	*/
263	GMMPRIORITY enmPriority;
264	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Priority", sz, sizeof(sz));
265	if (RT_SUCCESS(rc))
266	{
267	if (!RTStrICmp(sz, "low"))
268	enmPriority = GMMPRIORITY_LOW;
269	else if (!RTStrICmp(sz, "normal"))
270	enmPriority = GMMPRIORITY_NORMAL;
271	else if (!RTStrICmp(sz, "high"))
272	enmPriority = GMMPRIORITY_HIGH;
273	else
274	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Priority\" value \"%s\"", sz);
275	}
276	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
277	enmPriority = GMMPRIORITY_NORMAL;
278	else
279	AssertMsgRCReturn(rc, ("Configuration error: Failed to query string \"MM/Priority\", rc=%Vrc.\n", rc), rc);
280
281	/*
282	* Make the initial memory reservation with GMM.
283	*/
284	rc = GMMR3InitialReservation(pVM, cbRam >> PAGE_SHIFT, 1, 1, enmPolicy, enmPriority);
285	if (RT_FAILURE(rc))
286	{
287	if (rc == VERR_GMM_MEMORY_RESERVATION_DECLINED)
288	return VMSetError(pVM, rc, RT_SRC_POS,
289	N_("Insufficient free memory to start the VM (cbRam=%#RX64 enmPolicy=%d enmPriority=%d)"),
290	cbRam, enmPolicy, enmPriority);
291	return VMSetError(pVM, rc, RT_SRC_POS, "GMMR3InitialReservation(,%#RX64,0,0,%d,%d).",
292	cbRam >> PAGE_SHIFT, enmPolicy, enmPriority);
293	}
294	#endif /* VBOX_WITH_NEW_PHYS_CODE */
295
296	/*
297	* If RamSize is 0 we're done now.
298	*/
299	if (cbRam < PAGE_SIZE)
300	{
301	Log(("MM: No RAM configured\n"));
302	return VINF_SUCCESS;
303	}
304
305	#ifdef VBOX_WITH_NEW_PHYS_CODE
306	/*
307	* Setup the base ram (PGM).
308	*/
309	rc = PGMR3PhysRegisterRam(pVM, 0, cbRam, "Base RAM");
310	if (RT_SUCCESS(rc) && fPreAlloc)
311	{
312	/** @todo implement RamPreAlloc if it makes sense. */
313	return VM_SET_ERROR(pVM, VERR_NOT_IMPLEMENTED, "TODO: RamPreAlloc");
314	}
315
316	#else
317	rc = MMR3PhysRegisterEx(pVM, NULL, 0, cbRam, MM_RAM_FLAGS_DYNAMIC_ALLOC, MM_PHYS_TYPE_NORMAL, "Main Memory");
318	if (RT_SUCCESS(rc))
319	{
320	/*
321	* Allocate the first chunk, as we'll map ROM ranges there.
322	* If requested, allocated the rest too.
323	*/
324	rc = PGM3PhysGrowRange(pVM, (RTGCPHYS)0);
325	if (RT_SUCCESS(rc) && fPreAlloc)
326	for (RTGCPHYS GCPhys = PGM_DYNAMIC_CHUNK_SIZE;
327	GCPhys < cbRam && RT_SUCCESS(rc);
328	GCPhys += PGM_DYNAMIC_CHUNK_SIZE)
329	rc = PGM3PhysGrowRange(pVM, GCPhys);
330	}
331	#endif
332
333	LogFlow(("MMR3InitPaging: returns %Vrc\n", rc));
334	return rc;
335	}
336
337
338	/**
339	* Terminates the MM.
340	*
341	* Termination means cleaning up and freeing all resources,
342	* the VM it self is at this point powered off or suspended.
343	*
344	* @returns VBox status code.
345	* @param pVM The VM to operate on.
346	*/
347	MMR3DECL(int) MMR3Term(PVM pVM)
348	{
349	return mmR3Term(pVM, false /* free the heap */);
350	}
351
352
353	/**
354	* Worker for MMR3Term and MMR3Init.
355	*
356	* The tricky bit here is that we must not destroy the heap if we're
357	* called from MMR3Init, otherwise we'll get into trouble when
358	* CFGMR3Term is called later in the bailout process.
359	*
360	* @returns VBox status code.
361	* @param pVM The VM to operate on.
362	* @param fKeepTheHeap Whether or not to keep the heap.
363	*/
364	static int mmR3Term(PVM pVM, bool fKeepTheHeap)
365	{
366	/*
367	* Destroy the page pool. (first as it used the hyper heap)
368	*/
369	mmR3PagePoolTerm(pVM);
370
371	/*
372	* Release locked memory.
373	* (Associated record are released by the heap.)
374	*/
375	PMMLOCKEDMEM pLockedMem = pVM->mm.s.pLockedMem;
376	while (pLockedMem)
377	{
378	int rc = SUPPageUnlock(pLockedMem->pv);
379	AssertMsgRC(rc, ("SUPPageUnlock(%p) -> rc=%d\n", pLockedMem->pv, rc));
380	switch (pLockedMem->eType)
381	{
382	case MM_LOCKED_TYPE_HYPER:
383	rc = SUPPageFree(pLockedMem->pv, pLockedMem->cb >> PAGE_SHIFT);
384	AssertMsgRC(rc, ("SUPPageFree(%p) -> rc=%d\n", pLockedMem->pv, rc));
385	break;
386	case MM_LOCKED_TYPE_HYPER_NOFREE:
387	case MM_LOCKED_TYPE_HYPER_PAGES:
388	case MM_LOCKED_TYPE_PHYS:
389	/* nothing to do. */
390	break;
391	}
392	/* next */
393	pLockedMem = pLockedMem->pNext;
394	}
395
396	/*
397	* Destroy the heap if requested.
398	*/
399	if (!fKeepTheHeap)
400	{
401	mmR3HeapDestroy(pVM->mm.s.pHeap);
402	pVM->mm.s.pHeap = NULL;
403	}
404
405	/*
406	* Zero stuff to detect after termination use of the MM interface
407	*/
408	pVM->mm.s.offLookupHyper = NIL_OFFSET;
409	pVM->mm.s.pLockedMem = NULL;
410	pVM->mm.s.pHyperHeapHC = NULL; /* freed above. */
411	pVM->mm.s.pHyperHeapGC = 0; /* freed above. */
412	pVM->mm.s.offVM = 0; /* init assertion on this */
413
414	return 0;
415	}
416
417
418	/**
419	* Reset notification.
420	*
421	* MM will reload shadow ROMs into RAM at this point and make
422	* the ROM writable.
423	*
424	* @param pVM The VM handle.
425	*/
426	MMR3DECL(void) MMR3Reset(PVM pVM)
427	{
428	mmR3PhysRomReset(pVM);
429	}
430
431
432	/**
433	* Execute state save operation.
434	*
435	* @returns VBox status code.
436	* @param pVM VM Handle.
437	* @param pSSM SSM operation handle.
438	*/
439	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM)
440	{
441	LogFlow(("mmR3Save:\n"));
442
443	/* (PGM saves the physical memory.) */
444	SSMR3PutU64(pSSM, pVM->mm.s.cBasePages);
445	return SSMR3PutU64(pSSM, pVM->mm.s.cbRamBase);
446	}
447
448
449	/**
450	* Execute state load operation.
451	*
452	* @returns VBox status code.
453	* @param pVM VM Handle.
454	* @param pSSM SSM operation handle.
455	* @param u32Version Data layout version.
456	*/
457	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
458	{
459	LogFlow(("mmR3Load:\n"));
460
461	/*
462	* Validate version.
463	*/
464	if ( SSM_VERSION_MAJOR_CHANGED(u32Version, MM_SAVED_STATE_VERSION)
465	\|\| !u32Version)
466	{
467	Log(("mmR3Load: Invalid version u32Version=%d!\n", u32Version));
468	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
469	}
470
471	/*
472	* Check the cBasePages and cbRamBase values.
473	*/
474	int rc;
475	RTUINT cb1;
476
477	/* cBasePages */
478	uint64_t cPages;
479	if (u32Version != 1)
480	rc = SSMR3GetU64(pSSM, &cPages);
481	else
482	{
483	rc = SSMR3GetUInt(pSSM, &cb1);
484	cPages = cb1 >> PAGE_SHIFT;
485	}
486	if (VBOX_FAILURE(rc))
487	return rc;
488	if (cPages != pVM->mm.s.cBasePages)
489	{
490	Log(("mmR3Load: Memory configuration has changed. cPages=%#RX64 saved=%#RX64\n", pVM->mm.s.cBasePages, cPages));
491	return VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH;
492	}
493
494	/* cbRamBase */
495	uint64_t cb;
496	if (u32Version != 1)
497	rc = SSMR3GetU64(pSSM, &cb);
498	else
499	{
500	rc = SSMR3GetUInt(pSSM, &cb1);
501	cb = cb1;
502	}
503	if (VBOX_FAILURE(rc))
504	return rc;
505	if (cb != pVM->mm.s.cbRamBase)
506	{
507	Log(("mmR3Load: Memory configuration has changed. cbRamBase=%#RX64 save=%#RX64\n", pVM->mm.s.cbRamBase, cb));
508	return VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH;
509	}
510
511	/* (PGM restores the physical memory.) */
512	return rc;
513	}
514
515
516	/**
517	* Updates GMM with memory reservation changes.
518	*
519	* Called when MM::cbRamRegistered, MM::cShadowPages or MM::cFixedPages changes.
520	*
521	* @returns VBox status code - see GMMR0UpdateReservation.
522	* @param pVM The shared VM structure.
523	*/
524	int mmR3UpdateReservation(PVM pVM)
525	{
526	if (pVM->mm.s.fDoneMMR3InitPaging)
527	return GMMR3UpdateReservation(pVM,
528	RT_MAX(pVM->mm.s.cBasePages, 1),
529	RT_MAX(pVM->mm.s.cShadowPages, 1),
530	RT_MAX(pVM->mm.s.cFixedPages, 1));
531	return VINF_SUCCESS;
532	}
533
534
535	/**
536	* Interface for PGM to increase the reservation of RAM and ROM pages.
537	*
538	* This can be called before MMR3InitPaging.
539	*
540	* @returns VBox status code.
541	* @param pVM The shared VM structure.
542	* @param cAddBasePages The number of pages to add.
543	*/
544	MMR3DECL(int) MMR3IncreaseBaseReservation(PVM pVM, uint64_t cAddBasePages)
545	{
546	LogFlow(("MMR3IncreaseBaseReservation: +%RU64 (%RU64 -> %RU64\n", cAddBasePages,
547	pVM->mm.s.cBasePages, pVM->mm.s.cBasePages + cAddBasePages));
548	pVM->mm.s.cBasePages += cAddBasePages;
549	return mmR3UpdateReservation(pVM);
550	}
551
552
553	/**
554	* Interface for PGM to increase the reservation of fixed pages.
555	*
556	* This can be called before MMR3InitPaging.
557	*
558	* @returns VBox status code.
559	* @param pVM The shared VM structure.
560	* @param cAddFixedPages The number of pages to add.
561	*/
562	MMR3DECL(int) MMR3AddFixedReservation(PVM pVM, uint32_t cAddFixedPages)
563	{
564	LogFlow(("MMR3AddFixedReservation: +%u (%u -> %u)\n", cAddFixedPages,
565	pVM->mm.s.cFixedPages, pVM->mm.s.cFixedPages + cAddFixedPages));
566	pVM->mm.s.cFixedPages += cAddFixedPages;
567	return mmR3UpdateReservation(pVM);
568	}
569
570
571	/**
572	* Interface for PGM to update the reservation of shadow pages.
573	*
574	* This can be called before MMR3InitPaging.
575	*
576	* @returns VBox status code.
577	* @param pVM The shared VM structure.
578	* @param cShadowPages The new page count.
579	*/
580	MMR3DECL(int) MMR3UpdateShadowReservation(PVM pVM, uint32_t cShadowPages)
581	{
582	LogFlow(("MMR3UpdateShadowReservation: %u -> %u\n", pVM->mm.s.cShadowPages, cShadowPages));
583	pVM->mm.s.cShadowPages = cShadowPages;
584	return mmR3UpdateReservation(pVM);
585	}
586
587
588	/**
589	* Locks physical memory which backs a virtual memory range (HC) adding
590	* the required records to the pLockedMem list.
591	*
592	* @returns VBox status code.
593	* @param pVM The VM handle.
594	* @param pv Pointer to memory range which shall be locked down.
595	* This pointer is page aligned.
596	* @param cb Size of memory range (in bytes). This size is page aligned.
597	* @param eType Memory type.
598	* @param ppLockedMem Where to store the pointer to the created locked memory record.
599	* This is optional, pass NULL if not used.
600	* @param fSilentFailure Don't raise an error when unsuccessful. Upper layer with deal with it.
601	*/
602	int mmR3LockMem(PVM pVM, void pv, size_t cb, MMLOCKEDTYPE eType, PMMLOCKEDMEM ppLockedMem, bool fSilentFailure)
603	{
604	Assert(RT_ALIGN_P(pv, PAGE_SIZE) == pv);
605	Assert(RT_ALIGN_Z(cb, PAGE_SIZE) == cb);
606
607	if (ppLockedMem)
608	*ppLockedMem = NULL;
609
610	/*
611	* Allocate locked mem structure.
612	*/
613	unsigned cPages = cb >> PAGE_SHIFT;
614	AssertReturn(cPages == (cb >> PAGE_SHIFT), VERR_OUT_OF_RANGE);
615	PMMLOCKEDMEM pLockedMem = (PMMLOCKEDMEM)MMR3HeapAlloc(pVM, MM_TAG_MM, RT_OFFSETOF(MMLOCKEDMEM, aPhysPages[cPages]));
616	if (!pLockedMem)
617	return VERR_NO_MEMORY;
618	pLockedMem->pv = pv;
619	pLockedMem->cb = cb;
620	pLockedMem->eType = eType;
621	memset(&pLockedMem->u, 0, sizeof(pLockedMem->u));
622
623	/*
624	* Lock the memory.
625	*/
626	int rc = SUPPageLock(pv, cPages, &pLockedMem->aPhysPages[0]);
627	if (VBOX_SUCCESS(rc))
628	{
629	/*
630	* Setup the reserved field.
631	*/
632	PSUPPAGE pPhysPage = &pLockedMem->aPhysPages[0];
633	for (unsigned c = cPages; c > 0; c--, pPhysPage++)
634	pPhysPage->uReserved = (RTHCUINTPTR)pLockedMem;
635
636	/*
637	* Insert into the list.
638	*
639	* ASSUME no protected needed here as only one thread in the system can possibly
640	* be doing this. No other threads will walk this list either we assume.
641	*/
642	pLockedMem->pNext = pVM->mm.s.pLockedMem;
643	pVM->mm.s.pLockedMem = pLockedMem;
644	/* Set return value. */
645	if (ppLockedMem)
646	*ppLockedMem = pLockedMem;
647	}
648	else
649	{
650	AssertMsgFailed(("SUPPageLock failed with rc=%d\n", rc));
651	MMR3HeapFree(pLockedMem);
652	if (!fSilentFailure)
653	rc = VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to lock %d bytes of host memory (out of memory)"), cb);
654	}
655
656	return rc;
657	}
658
659
660	/**
661	* Maps a part of or an entire locked memory region into the guest context.
662	*
663	* @returns VBox status.
664	* God knows what happens if we fail...
665	* @param pVM VM handle.
666	* @param pLockedMem Locked memory structure.
667	* @param Addr GC Address where to start the mapping.
668	* @param iPage Page number in the locked memory region.
669	* @param cPages Number of pages to map.
670	* @param fFlags See the fFlags argument of PGR3Map().
671	*/
672	int mmR3MapLocked(PVM pVM, PMMLOCKEDMEM pLockedMem, RTGCPTR Addr, unsigned iPage, size_t cPages, unsigned fFlags)
673	{
674	/*
675	* Adjust ~0 argument
676	*/
677	if (cPages == ~(size_t)0)
678	cPages = (pLockedMem->cb >> PAGE_SHIFT) - iPage;
679	Assert(cPages != ~0U);
680	/* no incorrect arguments are accepted */
681	Assert(RT_ALIGN_GCPT(Addr, PAGE_SIZE, RTGCPTR) == Addr);
682	AssertMsg(iPage < (pLockedMem->cb >> PAGE_SHIFT), ("never even think about giving me a bad iPage(=%d)\n", iPage));
683	AssertMsg(iPage + cPages <= (pLockedMem->cb >> PAGE_SHIFT), ("never even think about giving me a bad cPages(=%d)\n", cPages));
684
685	/*
686	* Map the the pages.
687	*/
688	PSUPPAGE pPhysPage = &pLockedMem->aPhysPages[iPage];
689	while (cPages)
690	{
691	RTHCPHYS HCPhys = pPhysPage->Phys;
692	int rc = PGMMap(pVM, Addr, HCPhys, PAGE_SIZE, fFlags);
693	if (VBOX_FAILURE(rc))
694	{
695	/** @todo how the hell can we do a proper bailout here. */
696	return rc;
697	}
698
699	/* next */
700	cPages--;
701	iPage++;
702	pPhysPage++;
703	Addr += PAGE_SIZE;
704	}
705
706	return VINF_SUCCESS;
707	}
708
709
710	/**
711	* Convert HC Physical address to HC Virtual address.
712	*
713	* @returns VBox status.
714	* @param pVM VM handle.
715	* @param HCPhys The host context virtual address.
716	* @param ppv Where to store the resulting address.
717	* @thread The Emulation Thread.
718	*/
719	MMR3DECL(int) MMR3HCPhys2HCVirt(PVM pVM, RTHCPHYS HCPhys, void **ppv)
720	{
721	/*
722	* Try page tables.
723	*/
724	int rc = MMPagePhys2PageTry(pVM, HCPhys, ppv);
725	if (VBOX_SUCCESS(rc))
726	return rc;
727
728	/*
729	* Iterate the locked memory - very slow.
730	*/
731	uint32_t off = HCPhys & PAGE_OFFSET_MASK;
732	HCPhys &= X86_PTE_PAE_PG_MASK;
733	for (PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem; pCur; pCur = pCur->pNext)
734	{
735	size_t iPage = pCur->cb >> PAGE_SHIFT;
736	while (iPage-- > 0)
737	if ((pCur->aPhysPages[iPage].Phys & X86_PTE_PAE_PG_MASK) == HCPhys)
738	{
739	ppv = (char )pCur->pv + (iPage << PAGE_SHIFT) + off;
740	return VINF_SUCCESS;
741	}
742	}
743	/* give up */
744	return VERR_INVALID_POINTER;
745	}
746
747
748	/**
749	* Read memory from GC virtual address using the current guest CR3.
750	*
751	* @returns VBox status.
752	* @param pVM VM handle.
753	* @param pvDst Destination address (HC of course).
754	* @param GCPtr GC virtual address.
755	* @param cb Number of bytes to read.
756	*/
757	MMR3DECL(int) MMR3ReadGCVirt(PVM pVM, void *pvDst, RTGCPTR GCPtr, size_t cb)
758	{
759	if (GCPtr - pVM->mm.s.pvHyperAreaGC < pVM->mm.s.cbHyperArea)
760	return MMR3HyperReadGCVirt(pVM, pvDst, GCPtr, cb);
761	return PGMPhysReadGCPtr(pVM, pvDst, GCPtr, cb);
762	}
763
764
765	/**
766	* Write to memory at GC virtual address translated using the current guest CR3.
767	*
768	* @returns VBox status.
769	* @param pVM VM handle.
770	* @param GCPtrDst GC virtual address.
771	* @param pvSrc The source address (HC of course).
772	* @param cb Number of bytes to read.
773	*/
774	MMR3DECL(int) MMR3WriteGCVirt(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
775	{
776	if (GCPtrDst - pVM->mm.s.pvHyperAreaGC < pVM->mm.s.cbHyperArea)
777	return VERR_ACCESS_DENIED;
778	return PGMPhysWriteGCPtr(pVM, GCPtrDst, pvSrc, cb);
779	}
780

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source: vbox/trunk/src/VBox/VMM/MM.cpp@ 6674

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