MM.cpp@ 7806

Last change on this file since 7806 was 7635, checked in by vboxsync, 17 years ago
The new MMIO2 code. WARNING! This changes the pci mapping protocol for MMIO2 so it's working the same way as I/O ports and normal MMIO memory. External users of the interface will have to update their mapping routines.
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1	/* $Id: MM.cpp 7635 2008-03-28 17:15:38Z 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21	* WARNING: THIS IS SOMEWHAT OUTDATED!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/uvm.h>
91	#include <VBox/err.h>
92	#include <VBox/param.h>
93
94	#include <VBox/log.h>
95	#include <iprt/alloc.h>
96	#include <iprt/assert.h>
97	#include <iprt/string.h>
98
99
100	/*******************************************************************************
101	* Defined Constants And Macros *
102	*******************************************************************************/
103	/** The current saved state versino of MM. */
104	#define MM_SAVED_STATE_VERSION 2
105
106
107	/*******************************************************************************
108	* Internal Functions *
109	*******************************************************************************/
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	* Initializes the MM members of the UVM.
116	*
117	* This is currently only the ring-3 heap.
118	*
119	* @returns VBox status code.
120	* @param pUVM Pointer to the user mode VM structure.
121	*/
122	MMR3DECL(int) MMR3InitUVM(PUVM pUVM)
123	{
124	/*
125	* Assert sizes and order.
126	*/
127	AssertCompile(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
128	AssertRelease(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
129	Assert(!pUVM->mm.s.pHeap);
130
131	/*
132	* Init the heap.
133	*/
134	return mmR3HeapCreateU(pUVM, &pUVM->mm.s.pHeap);
135	}
136
137
138	/**
139	* Initializes the MM.
140	*
141	* MM is managing the virtual address space (among other things) and
142	* setup the hypvervisor memory area mapping in the VM structure and
143	* the hypvervisor alloc-only-heap. Assuming the current init order
144	* and components the hypvervisor memory area looks like this:
145	* -# VM Structure.
146	* -# Hypervisor alloc only heap (also call Hypervisor memory region).
147	* -# Core code.
148	*
149	* MM determins the virtual address of the hypvervisor memory area by
150	* checking for location at previous run. If that property isn't available
151	* it will choose a default starting location, currently 0xe0000000.
152	*
153	* @returns VBox status code.
154	* @param pVM The VM to operate on.
155	*/
156	MMR3DECL(int) MMR3Init(PVM pVM)
157	{
158	LogFlow(("MMR3Init\n"));
159
160	/*
161	* Assert alignment, sizes and order.
162	*/
163	AssertRelease(!(RT_OFFSETOF(VM, mm.s) & 31));
164	AssertRelease(sizeof(pVM->mm.s) <= sizeof(pVM->mm.padding));
165	AssertMsg(pVM->mm.s.offVM == 0, ("Already initialized!\n"));
166
167	/*
168	* Init the structure.
169	*/
170	pVM->mm.s.offVM = RT_OFFSETOF(VM, mm);
171	pVM->mm.s.offLookupHyper = NIL_OFFSET;
172
173	/*
174	* Init the page pool.
175	*/
176	int rc = mmR3PagePoolInit(pVM);
177	if (VBOX_SUCCESS(rc))
178	{
179	/*
180	* Init the hypervisor related stuff.
181	*/
182	rc = mmR3HyperInit(pVM);
183	if (VBOX_SUCCESS(rc))
184	{
185	/*
186	* Register the saved state data unit.
187	*/
188	rc = SSMR3RegisterInternal(pVM, "mm", 1, MM_SAVED_STATE_VERSION, sizeof(uint32_t) * 2,
189	NULL, mmR3Save, NULL,
190	NULL, mmR3Load, NULL);
191	if (VBOX_SUCCESS(rc))
192	return rc;
193
194	/* .... failure .... */
195	}
196	}
197	MMR3Term(pVM);
198	return rc;
199	}
200
201
202	/**
203	* Initializes the MM parts which depends on PGM being initialized.
204	*
205	* @returns VBox status code.
206	* @param pVM The VM to operate on.
207	* @remark No cleanup necessary since MMR3Term() will be called on failure.
208	*/
209	MMR3DECL(int) MMR3InitPaging(PVM pVM)
210	{
211	LogFlow(("MMR3InitPaging:\n"));
212
213	/*
214	* Query the CFGM values.
215	*/
216	int rc;
217	PCFGMNODE pMMCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "MM");
218	if (pMMCfg)
219	{
220	rc = CFGMR3InsertNode(CFGMR3GetRoot(pVM), "MM", &pMMCfg);
221	AssertRCReturn(rc, rc);
222	}
223
224	/** @cfgm{RamPreAlloc, boolean, false}
225	* Indicates whether the base RAM should all be allocated before starting
226	* the VM (default), or if it should be allocated when first written to.
227	*/
228	bool fPreAlloc;
229	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "RamPreAlloc", &fPreAlloc);
230	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
231	fPreAlloc = false;
232	else
233	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamPreAlloc\", rc=%Vrc.\n", rc), rc);
234
235	/** @cfgm{RamSize, uint64_t, 0, 0, UINT64_MAX}
236	* Specifies the size of the base RAM that is to be set up during
237	* VM initialization.
238	*/
239	uint64_t cbRam;
240	rc = CFGMR3QueryU64(CFGMR3GetRoot(pVM), "RamSize", &cbRam);
241	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
242	cbRam = 0;
243	else
244	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamSize\", rc=%Vrc.\n", rc), rc);
245
246	cbRam &= X86_PTE_PAE_PG_MASK;
247	pVM->mm.s.cbRamBase = cbRam; /* Warning: don't move this code to MMR3Init without fixing REMR3Init. */
248	Log(("MM: %RU64 bytes of RAM%s\n", cbRam, fPreAlloc ? " (PreAlloc)" : ""));
249
250	/** @cfgm{MM/Policy, string, no overcommitment}
251	* Specifies the policy to use when reserving memory for this VM. The recognized
252	* value is 'no overcommitment' (default). See GMMPOLICY.
253	*/
254	GMMOCPOLICY enmPolicy;
255	char sz[64];
256	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Policy", sz, sizeof(sz));
257	if (RT_SUCCESS(rc))
258	{
259	if ( !RTStrICmp(sz, "no_oc")
260	\|\| !RTStrICmp(sz, "no overcommitment"))
261	enmPolicy = GMMOCPOLICY_NO_OC;
262	else
263	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Policy\" value \"%s\"", sz);
264	}
265	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
266	enmPolicy = GMMOCPOLICY_NO_OC;
267	else
268	AssertMsgRCReturn(rc, ("Configuration error: Failed to query string \"MM/Policy\", rc=%Vrc.\n", rc), rc);
269
270	/** @cfgm{MM/Priority, string, normal}
271	* Specifies the memory priority of this VM. The priority comes into play when the
272	* system is overcommitted and the VMs needs to be milked for memory. The recognized
273	* values are 'low', 'normal' (default) and 'high'. See GMMPRIORITY.
274	*/
275	GMMPRIORITY enmPriority;
276	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Priority", sz, sizeof(sz));
277	if (RT_SUCCESS(rc))
278	{
279	if (!RTStrICmp(sz, "low"))
280	enmPriority = GMMPRIORITY_LOW;
281	else if (!RTStrICmp(sz, "normal"))
282	enmPriority = GMMPRIORITY_NORMAL;
283	else if (!RTStrICmp(sz, "high"))
284	enmPriority = GMMPRIORITY_HIGH;
285	else
286	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Priority\" value \"%s\"", sz);
287	}
288	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
289	enmPriority = GMMPRIORITY_NORMAL;
290	else
291	AssertMsgRCReturn(rc, ("Configuration error: Failed to query string \"MM/Priority\", rc=%Vrc.\n", rc), rc);
292
293	/*
294	* Make the initial memory reservation with GMM.
295	*/
296	rc = GMMR3InitialReservation(pVM, cbRam >> PAGE_SHIFT, 1, 1, enmPolicy, enmPriority);
297	if (RT_FAILURE(rc))
298	{
299	if (rc == VERR_GMM_MEMORY_RESERVATION_DECLINED)
300	return VMSetError(pVM, rc, RT_SRC_POS,
301	N_("Insufficient free memory to start the VM (cbRam=%#RX64 enmPolicy=%d enmPriority=%d)"),
302	cbRam, enmPolicy, enmPriority);
303	return VMSetError(pVM, rc, RT_SRC_POS, "GMMR3InitialReservation(,%#RX64,0,0,%d,%d)",
304	cbRam >> PAGE_SHIFT, enmPolicy, enmPriority);
305	}
306
307	/*
308	* If RamSize is 0 we're done now.
309	*/
310	if (cbRam < PAGE_SIZE)
311	{
312	Log(("MM: No RAM configured\n"));
313	return VINF_SUCCESS;
314	}
315
316	/*
317	* Setup the base ram (PGM).
318	*/
319	rc = PGMR3PhysRegisterRam(pVM, 0, cbRam, "Base RAM");
320	#ifdef VBOX_WITH_NEW_PHYS_CODE
321	if (RT_SUCCESS(rc) && fPreAlloc)
322	{
323	/** @todo RamPreAlloc should be handled at the very end of the VM creation. (lazy bird) */
324	return VM_SET_ERROR(pVM, VERR_NOT_IMPLEMENTED, "TODO: RamPreAlloc");
325	}
326	#else
327	if (RT_SUCCESS(rc))
328	{
329	/*
330	* Allocate the first chunk, as we'll map ROM ranges there.
331	* If requested, allocated the rest too.
332	*/
333	RTGCPHYS GCPhys = (RTGCPHYS)0;
334	rc = PGM3PhysGrowRange(pVM, &GCPhys);
335	if (RT_SUCCESS(rc) && fPreAlloc)
336	for (GCPhys = PGM_DYNAMIC_CHUNK_SIZE;
337	GCPhys < cbRam && RT_SUCCESS(rc);
338	GCPhys += PGM_DYNAMIC_CHUNK_SIZE)
339	rc = PGM3PhysGrowRange(pVM, &GCPhys);
340	}
341	#endif
342
343	LogFlow(("MMR3InitPaging: returns %Vrc\n", rc));
344	return rc;
345	}
346
347
348	/**
349	* Terminates the MM.
350	*
351	* Termination means cleaning up and freeing all resources,
352	* the VM it self is at this point powered off or suspended.
353	*
354	* @returns VBox status code.
355	* @param pVM The VM to operate on.
356	*/
357	MMR3DECL(int) MMR3Term(PVM pVM)
358	{
359	/*
360	* Destroy the page pool. (first as it used the hyper heap)
361	*/
362	mmR3PagePoolTerm(pVM);
363
364	/*
365	* Release locked memory.
366	* (Associated record are released by the heap.)
367	*/
368	PMMLOCKEDMEM pLockedMem = pVM->mm.s.pLockedMem;
369	while (pLockedMem)
370	{
371	int rc = SUPPageUnlock(pLockedMem->pv);
372	AssertMsgRC(rc, ("SUPPageUnlock(%p) -> rc=%d\n", pLockedMem->pv, rc));
373	switch (pLockedMem->eType)
374	{
375	case MM_LOCKED_TYPE_HYPER:
376	rc = SUPPageFree(pLockedMem->pv, pLockedMem->cb >> PAGE_SHIFT);
377	AssertMsgRC(rc, ("SUPPageFree(%p) -> rc=%d\n", pLockedMem->pv, rc));
378	break;
379	case MM_LOCKED_TYPE_HYPER_NOFREE:
380	case MM_LOCKED_TYPE_HYPER_PAGES:
381	case MM_LOCKED_TYPE_PHYS:
382	/* nothing to do. */
383	break;
384	}
385	/* next */
386	pLockedMem = pLockedMem->pNext;
387	}
388
389	/*
390	* Zero stuff to detect after termination use of the MM interface
391	*/
392	pVM->mm.s.offLookupHyper = NIL_OFFSET;
393	pVM->mm.s.pLockedMem = NULL;
394	pVM->mm.s.pHyperHeapHC = NULL; /* freed above. */
395	pVM->mm.s.pHyperHeapGC = 0; /* freed above. */
396	pVM->mm.s.offVM = 0; /* init assertion on this */
397
398	return 0;
399	}
400
401
402	/**
403	* Terminates the UVM part of MM.
404	*
405	* Termination means cleaning up and freeing all resources,
406	* the VM it self is at this point powered off or suspended.
407	*
408	* @returns VBox status code.
409	* @param pUVM Pointer to the user mode VM structure.
410	*/
411	MMR3DECL(void) MMR3TermUVM(PUVM pUVM)
412	{
413	/*
414	* Destroy the heap.
415	*/
416	mmR3HeapDestroy(pUVM->mm.s.pHeap);
417	pUVM->mm.s.pHeap = NULL;
418	}
419
420
421	/**
422	* Reset notification.
423	*
424	* MM will reload shadow ROMs into RAM at this point and make
425	* the ROM writable.
426	*
427	* @param pVM The VM handle.
428	*/
429	MMR3DECL(void) MMR3Reset(PVM pVM)
430	{
431	mmR3PhysRomReset(pVM);
432	}
433
434
435	/**
436	* Execute state save operation.
437	*
438	* @returns VBox status code.
439	* @param pVM VM Handle.
440	* @param pSSM SSM operation handle.
441	*/
442	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM)
443	{
444	LogFlow(("mmR3Save:\n"));
445
446	/* (PGM saves the physical memory.) */
447	SSMR3PutU64(pSSM, pVM->mm.s.cBasePages);
448	return SSMR3PutU64(pSSM, pVM->mm.s.cbRamBase);
449	}
450
451
452	/**
453	* Execute state load operation.
454	*
455	* @returns VBox status code.
456	* @param pVM VM Handle.
457	* @param pSSM SSM operation handle.
458	* @param u32Version Data layout version.
459	*/
460	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
461	{
462	LogFlow(("mmR3Load:\n"));
463
464	/*
465	* Validate version.
466	*/
467	if ( SSM_VERSION_MAJOR_CHANGED(u32Version, MM_SAVED_STATE_VERSION)
468	\|\| !u32Version)
469	{
470	Log(("mmR3Load: Invalid version u32Version=%d!\n", u32Version));
471	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
472	}
473
474	/*
475	* Check the cBasePages and cbRamBase values.
476	*/
477	int rc;
478	RTUINT cb1;
479
480	/* cBasePages */
481	uint64_t cPages;
482	if (u32Version != 1)
483	rc = SSMR3GetU64(pSSM, &cPages);
484	else
485	{
486	rc = SSMR3GetUInt(pSSM, &cb1);
487	cPages = cb1 >> PAGE_SHIFT;
488	}
489	if (VBOX_FAILURE(rc))
490	return rc;
491	if (cPages != pVM->mm.s.cBasePages)
492	{
493	Log(("mmR3Load: Memory configuration has changed. cPages=%#RX64 saved=%#RX64\n", pVM->mm.s.cBasePages, cPages));
494	return VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH;
495	}
496
497	/* cbRamBase */
498	uint64_t cb;
499	if (u32Version != 1)
500	rc = SSMR3GetU64(pSSM, &cb);
501	else
502	{
503	rc = SSMR3GetUInt(pSSM, &cb1);
504	cb = cb1;
505	}
506	if (VBOX_FAILURE(rc))
507	return rc;
508	if (cb != pVM->mm.s.cbRamBase)
509	{
510	Log(("mmR3Load: Memory configuration has changed. cbRamBase=%#RX64 save=%#RX64\n", pVM->mm.s.cbRamBase, cb));
511	return VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH;
512	}
513
514	/* (PGM restores the physical memory.) */
515	return rc;
516	}
517
518
519	/**
520	* Updates GMM with memory reservation changes.
521	*
522	* Called when MM::cbRamRegistered, MM::cShadowPages or MM::cFixedPages changes.
523	*
524	* @returns VBox status code - see GMMR0UpdateReservation.
525	* @param pVM The shared VM structure.
526	*/
527	int mmR3UpdateReservation(PVM pVM)
528	{
529	VM_ASSERT_EMT(pVM);
530	if (pVM->mm.s.fDoneMMR3InitPaging)
531	return GMMR3UpdateReservation(pVM,
532	RT_MAX(pVM->mm.s.cBasePages, 1),
533	RT_MAX(pVM->mm.s.cShadowPages, 1),
534	RT_MAX(pVM->mm.s.cFixedPages, 1));
535	return VINF_SUCCESS;
536	}
537
538
539	/**
540	* Interface for PGM to increase the reservation of RAM and ROM pages.
541	*
542	* This can be called before MMR3InitPaging.
543	*
544	* @returns VBox status code. Will set VM error on failure.
545	* @param pVM The shared VM structure.
546	* @param cAddBasePages The number of pages to add.
547	*/
548	MMR3DECL(int) MMR3IncreaseBaseReservation(PVM pVM, uint64_t cAddBasePages)
549	{
550	uint64_t cOld = pVM->mm.s.cBasePages;
551	pVM->mm.s.cBasePages += cAddBasePages;
552	LogFlow(("MMR3IncreaseBaseReservation: +%RU64 (%RU64 -> %RU64\n", cAddBasePages, cOld, pVM->mm.s.cBasePages));
553	int rc = mmR3UpdateReservation(pVM);
554	if (RT_FAILURE(rc))
555	{
556	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserved physical memory for the RAM (%#RX64 -> %#RX64)"), cOld, pVM->mm.s.cBasePages);
557	pVM->mm.s.cBasePages = cOld;
558	}
559	return rc;
560	}
561
562
563	/**
564	* Interface for PGM to adjust the reservation of fixed pages.
565	*
566	* This can be called before MMR3InitPaging.
567	*
568	* @returns VBox status code. Will set VM error on failure.
569	* @param pVM The shared VM structure.
570	* @param cDeltaFixedPages The number of pages to add (positive) or subtract (negative).
571	* @param pszDesc Some description associated with the reservation.
572	*/
573	MMR3DECL(int) MMR3AdjustFixedReservation(PVM pVM, int32_t cDeltaFixedPages, const char *pszDesc)
574	{
575	const uint32_t cOld = pVM->mm.s.cFixedPages;
576	pVM->mm.s.cFixedPages += cDeltaFixedPages;
577	LogFlow(("MMR3AdjustFixedReservation: %d (%u -> %u)\n", cDeltaFixedPages, cOld, pVM->mm.s.cFixedPages));
578	int rc = mmR3UpdateReservation(pVM);
579	if (RT_FAILURE(rc))
580	{
581	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory (%#x -> %#x; %s)"),
582	cOld, pVM->mm.s.cFixedPages, pszDesc);
583	pVM->mm.s.cFixedPages = cOld;
584	}
585	return rc;
586	}
587
588
589	/**
590	* Interface for PGM to update the reservation of shadow pages.
591	*
592	* This can be called before MMR3InitPaging.
593	*
594	* @returns VBox status code. Will set VM error on failure.
595	* @param pVM The shared VM structure.
596	* @param cShadowPages The new page count.
597	*/
598	MMR3DECL(int) MMR3UpdateShadowReservation(PVM pVM, uint32_t cShadowPages)
599	{
600	const uint32_t cOld = pVM->mm.s.cShadowPages;
601	pVM->mm.s.cShadowPages = cShadowPages;
602	LogFlow(("MMR3UpdateShadowReservation: %u -> %u\n", cOld, pVM->mm.s.cShadowPages));
603	int rc = mmR3UpdateReservation(pVM);
604	if (RT_FAILURE(rc))
605	{
606	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory for shadow page tables (%#x -> %#x)"), cOld, pVM->mm.s.cShadowPages);
607	pVM->mm.s.cShadowPages = cOld;
608	}
609	return rc;
610	}
611
612
613	/**
614	* Locks physical memory which backs a virtual memory range (HC) adding
615	* the required records to the pLockedMem list.
616	*
617	* @returns VBox status code.
618	* @param pVM The VM handle.
619	* @param pv Pointer to memory range which shall be locked down.
620	* This pointer is page aligned.
621	* @param cb Size of memory range (in bytes). This size is page aligned.
622	* @param eType Memory type.
623	* @param ppLockedMem Where to store the pointer to the created locked memory record.
624	* This is optional, pass NULL if not used.
625	* @param fSilentFailure Don't raise an error when unsuccessful. Upper layer with deal with it.
626	*/
627	int mmR3LockMem(PVM pVM, void pv, size_t cb, MMLOCKEDTYPE eType, PMMLOCKEDMEM ppLockedMem, bool fSilentFailure)
628	{
629	Assert(RT_ALIGN_P(pv, PAGE_SIZE) == pv);
630	Assert(RT_ALIGN_Z(cb, PAGE_SIZE) == cb);
631
632	if (ppLockedMem)
633	*ppLockedMem = NULL;
634
635	/*
636	* Allocate locked mem structure.
637	*/
638	unsigned cPages = cb >> PAGE_SHIFT;
639	AssertReturn(cPages == (cb >> PAGE_SHIFT), VERR_OUT_OF_RANGE);
640	PMMLOCKEDMEM pLockedMem = (PMMLOCKEDMEM)MMR3HeapAlloc(pVM, MM_TAG_MM, RT_OFFSETOF(MMLOCKEDMEM, aPhysPages[cPages]));
641	if (!pLockedMem)
642	return VERR_NO_MEMORY;
643	pLockedMem->pv = pv;
644	pLockedMem->cb = cb;
645	pLockedMem->eType = eType;
646	memset(&pLockedMem->u, 0, sizeof(pLockedMem->u));
647
648	/*
649	* Lock the memory.
650	*/
651	int rc = SUPPageLock(pv, cPages, &pLockedMem->aPhysPages[0]);
652	if (VBOX_SUCCESS(rc))
653	{
654	/*
655	* Setup the reserved field.
656	*/
657	PSUPPAGE pPhysPage = &pLockedMem->aPhysPages[0];
658	for (unsigned c = cPages; c > 0; c--, pPhysPage++)
659	pPhysPage->uReserved = (RTHCUINTPTR)pLockedMem;
660
661	/*
662	* Insert into the list.
663	*
664	* ASSUME no protected needed here as only one thread in the system can possibly
665	* be doing this. No other threads will walk this list either we assume.
666	*/
667	pLockedMem->pNext = pVM->mm.s.pLockedMem;
668	pVM->mm.s.pLockedMem = pLockedMem;
669	/* Set return value. */
670	if (ppLockedMem)
671	*ppLockedMem = pLockedMem;
672	}
673	else
674	{
675	AssertMsgFailed(("SUPPageLock failed with rc=%d\n", rc));
676	MMR3HeapFree(pLockedMem);
677	if (!fSilentFailure)
678	rc = VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to lock %d bytes of host memory (out of memory)"), cb);
679	}
680
681	return rc;
682	}
683
684
685	/**
686	* Maps a part of or an entire locked memory region into the guest context.
687	*
688	* @returns VBox status.
689	* God knows what happens if we fail...
690	* @param pVM VM handle.
691	* @param pLockedMem Locked memory structure.
692	* @param Addr GC Address where to start the mapping.
693	* @param iPage Page number in the locked memory region.
694	* @param cPages Number of pages to map.
695	* @param fFlags See the fFlags argument of PGR3Map().
696	*/
697	int mmR3MapLocked(PVM pVM, PMMLOCKEDMEM pLockedMem, RTGCPTR Addr, unsigned iPage, size_t cPages, unsigned fFlags)
698	{
699	/*
700	* Adjust ~0 argument
701	*/
702	if (cPages == ~(size_t)0)
703	cPages = (pLockedMem->cb >> PAGE_SHIFT) - iPage;
704	Assert(cPages != ~0U);
705	/* no incorrect arguments are accepted */
706	Assert(RT_ALIGN_GCPT(Addr, PAGE_SIZE, RTGCPTR) == Addr);
707	AssertMsg(iPage < (pLockedMem->cb >> PAGE_SHIFT), ("never even think about giving me a bad iPage(=%d)\n", iPage));
708	AssertMsg(iPage + cPages <= (pLockedMem->cb >> PAGE_SHIFT), ("never even think about giving me a bad cPages(=%d)\n", cPages));
709
710	/*
711	* Map the the pages.
712	*/
713	PSUPPAGE pPhysPage = &pLockedMem->aPhysPages[iPage];
714	while (cPages)
715	{
716	RTHCPHYS HCPhys = pPhysPage->Phys;
717	int rc = PGMMap(pVM, Addr, HCPhys, PAGE_SIZE, fFlags);
718	if (VBOX_FAILURE(rc))
719	{
720	/** @todo how the hell can we do a proper bailout here. */
721	return rc;
722	}
723
724	/* next */
725	cPages--;
726	iPage++;
727	pPhysPage++;
728	Addr += PAGE_SIZE;
729	}
730
731	return VINF_SUCCESS;
732	}
733
734
735	/**
736	* Convert HC Physical address to HC Virtual address.
737	*
738	* @returns VBox status.
739	* @param pVM VM handle.
740	* @param HCPhys The host context virtual address.
741	* @param ppv Where to store the resulting address.
742	* @thread The Emulation Thread.
743	*/
744	MMR3DECL(int) MMR3HCPhys2HCVirt(PVM pVM, RTHCPHYS HCPhys, void **ppv)
745	{
746	/*
747	* Try page tables.
748	*/
749	int rc = MMPagePhys2PageTry(pVM, HCPhys, ppv);
750	if (VBOX_SUCCESS(rc))
751	return rc;
752
753	/*
754	* Iterate the locked memory - very slow.
755	*/
756	uint32_t off = HCPhys & PAGE_OFFSET_MASK;
757	HCPhys &= X86_PTE_PAE_PG_MASK;
758	for (PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem; pCur; pCur = pCur->pNext)
759	{
760	size_t iPage = pCur->cb >> PAGE_SHIFT;
761	while (iPage-- > 0)
762	if ((pCur->aPhysPages[iPage].Phys & X86_PTE_PAE_PG_MASK) == HCPhys)
763	{
764	ppv = (char )pCur->pv + (iPage << PAGE_SHIFT) + off;
765	return VINF_SUCCESS;
766	}
767	}
768	/* give up */
769	return VERR_INVALID_POINTER;
770	}
771
772
773	/**
774	* Read memory from GC virtual address using the current guest CR3.
775	*
776	* @returns VBox status.
777	* @param pVM VM handle.
778	* @param pvDst Destination address (HC of course).
779	* @param GCPtr GC virtual address.
780	* @param cb Number of bytes to read.
781	*/
782	MMR3DECL(int) MMR3ReadGCVirt(PVM pVM, void *pvDst, RTGCPTR GCPtr, size_t cb)
783	{
784	if (GCPtr - pVM->mm.s.pvHyperAreaGC < pVM->mm.s.cbHyperArea)
785	return MMR3HyperReadGCVirt(pVM, pvDst, GCPtr, cb);
786	return PGMPhysReadGCPtr(pVM, pvDst, GCPtr, cb);
787	}
788
789
790	/**
791	* Write to memory at GC virtual address translated using the current guest CR3.
792	*
793	* @returns VBox status.
794	* @param pVM VM handle.
795	* @param GCPtrDst GC virtual address.
796	* @param pvSrc The source address (HC of course).
797	* @param cb Number of bytes to read.
798	*/
799	MMR3DECL(int) MMR3WriteGCVirt(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
800	{
801	if (GCPtrDst - pVM->mm.s.pvHyperAreaGC < pVM->mm.s.cbHyperArea)
802	return VERR_ACCESS_DENIED;
803	return PGMPhysWriteGCPtr(pVM, GCPtrDst, pvSrc, cb);
804	}
805

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source: vbox/trunk/src/VBox/VMM/MM.cpp@ 7806

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