MM.cpp@ 95843

Last change on this file since 95843 was 93718, checked in by vboxsync, 3 years ago
VMM/MM: Removed the hyper heap. bugref:10093 bugref:9517
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1	/* $Id: MM.cpp 93718 2022-02-14 11:09:36Z vboxsync $ */
2	/** @file
3	* MM - Memory Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 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	/** @page pg_mm MM - The Memory Manager
20	*
21	* The memory manager is in charge of the following memory:
22	* - Hypervisor Memory Area (HMA) - Address space management (obsolete in 6.1).
23	* - Hypervisor Heap - A memory heap that lives in all contexts.
24	* - User-Kernel Heap - A memory heap lives in both host context.
25	* - Tagged ring-3 heap.
26	* - Page pools - Primarily used by PGM for shadow page tables.
27	* - Locked process memory - Guest RAM and other. (reduce/obsolete this)
28	* - Physical guest memory (RAM & ROM) - Moving to PGM. (obsolete this)
29	*
30	* The global memory manager (GMM) is the global counter part / partner of MM.
31	* MM will provide therefore ring-3 callable interfaces for some of the GMM APIs
32	* related to resource tracking (PGM is the user).
33	*
34	* @see grp_mm
35	*
36	*
37	* @section sec_mm_hma Hypervisor Memory Area - Obsolete in 6.1
38	*
39	* The HMA is used when executing in raw-mode. We borrow, with the help of
40	* PGMMap, some unused space (one or more page directory entries to be precise)
41	* in the guest's virtual memory context. PGM will monitor the guest's virtual
42	* address space for changes and relocate the HMA when required.
43	*
44	* To give some idea what's in the HMA, study the 'info hma' output:
45	* @verbatim
46	VBoxDbg> info hma
47	Hypervisor Memory Area (HMA) Layout: Base 00000000a0000000, 0x00800000 bytes
48	00000000a05cc000-00000000a05cd000 DYNAMIC fence
49	00000000a05c4000-00000000a05cc000 DYNAMIC Dynamic mapping
50	00000000a05c3000-00000000a05c4000 DYNAMIC fence
51	00000000a05b8000-00000000a05c3000 DYNAMIC Paging
52	00000000a05b6000-00000000a05b8000 MMIO2 0000000000000000 PCNetShMem
53	00000000a0536000-00000000a05b6000 MMIO2 0000000000000000 VGA VRam
54	00000000a0523000-00000000a0536000 00002aaab3d0c000 LOCKED autofree alloc once (PDM_DEVICE)
55	00000000a0522000-00000000a0523000 DYNAMIC fence
56	00000000a051e000-00000000a0522000 00002aaab36f5000 LOCKED autofree VBoxDD2RC.rc
57	00000000a051d000-00000000a051e000 DYNAMIC fence
58	00000000a04eb000-00000000a051d000 00002aaab36c3000 LOCKED autofree VBoxDDRC.rc
59	00000000a04ea000-00000000a04eb000 DYNAMIC fence
60	00000000a04e9000-00000000a04ea000 00002aaab36c2000 LOCKED autofree ram range (High ROM Region)
61	00000000a04e8000-00000000a04e9000 DYNAMIC fence
62	00000000a040e000-00000000a04e8000 00002aaab2e6d000 LOCKED autofree VMMRC.rc
63	00000000a0208000-00000000a040e000 00002aaab2c67000 LOCKED autofree alloc once (PATM)
64	00000000a01f7000-00000000a0208000 00002aaaab92d000 LOCKED autofree alloc once (SELM)
65	00000000a01e7000-00000000a01f7000 00002aaaab5e8000 LOCKED autofree alloc once (SELM)
66	00000000a01e6000-00000000a01e7000 DYNAMIC fence
67	00000000a01e5000-00000000a01e6000 00002aaaab5e7000 HCPHYS 00000000c363c000 Core Code
68	00000000a01e4000-00000000a01e5000 DYNAMIC fence
69	00000000a01e3000-00000000a01e4000 00002aaaaab26000 HCPHYS 00000000619cf000 GIP
70	00000000a01a2000-00000000a01e3000 00002aaaabf32000 LOCKED autofree alloc once (PGM_PHYS)
71	00000000a016b000-00000000a01a2000 00002aaab233f000 LOCKED autofree alloc once (PGM_POOL)
72	00000000a016a000-00000000a016b000 DYNAMIC fence
73	00000000a0165000-00000000a016a000 DYNAMIC CR3 mapping
74	00000000a0164000-00000000a0165000 DYNAMIC fence
75	00000000a0024000-00000000a0164000 00002aaab215f000 LOCKED autofree Heap
76	00000000a0023000-00000000a0024000 DYNAMIC fence
77	00000000a0001000-00000000a0023000 00002aaab1d24000 LOCKED pages VM
78	00000000a0000000-00000000a0001000 DYNAMIC fence
79	@endverbatim
80	*
81	*
82	* @section sec_mm_hyperheap Hypervisor Heap
83	*
84	* The heap is accessible from ring-3, ring-0 and the raw-mode context. That
85	* said, it's not necessarily mapped into ring-0 on if that's possible since we
86	* don't wish to waste kernel address space without a good reason.
87	*
88	* Allocations within the heap are always in the same relative position in all
89	* contexts, so, it's possible to use offset based linking. In fact, the heap is
90	* internally using offset based linked lists tracking heap blocks. We use
91	* offset linked AVL trees and lists in a lot of places where share structures
92	* between RC, R3 and R0, so this is a strict requirement of the heap. However
93	* this means that we cannot easily extend the heap since the extension won't
94	* necessarily be in the continuation of the current heap memory in all (or any)
95	* context.
96	*
97	* All allocations are tagged. Per tag allocation statistics will be maintaining
98	* and exposed thru STAM when VBOX_WITH_STATISTICS is defined.
99	*
100	*
101	* @section sec_mm_r3heap Tagged Ring-3 Heap
102	*
103	* The ring-3 heap is a wrapper around the RTMem API adding allocation
104	* statistics and automatic cleanup on VM destruction.
105	*
106	* Per tag allocation statistics will be maintaining and exposed thru STAM when
107	* VBOX_WITH_STATISTICS is defined.
108	*
109	*
110	* @section sec_mm_page Page Pool
111	*
112	* The MM manages a page pool from which other components can allocate locked,
113	* page aligned and page sized memory objects. The pool provides facilities to
114	* convert back and forth between (host) physical and virtual addresses (within
115	* the pool of course). Several specialized interfaces are provided for the most
116	* common allocations and conversions to save the caller from bothersome casting
117	* and extra parameter passing.
118	*
119	*
120	* @section sec_mm_locked Locked Process Memory
121	*
122	* MM manages the locked process memory. This is used for a bunch of things
123	* (count the LOCKED entries in the 'info hma' output found in @ref sec_mm_hma),
124	* but the main consumer of memory is currently for guest RAM. There is an
125	* ongoing rewrite that will move all the guest RAM allocation to PGM and
126	* GMM.
127	*
128	* The locking of memory is something doing in cooperation with the VirtualBox
129	* support driver, SUPDrv (aka. VBoxDrv), thru the support library API,
130	* SUPR3 (aka. SUPLib).
131	*
132	*
133	* @section sec_mm_phys Physical Guest Memory
134	*
135	* MM is currently managing the physical memory for the guest. It relies heavily
136	* on PGM for this. There is an ongoing rewrite that will move this to PGM. (The
137	* rewrite is driven by the need for more flexible guest ram allocation, but
138	* also motivated by the fact that MMPhys is just adding stupid bureaucracy and
139	* that MMR3PhysReserve is a totally weird artifact that must go away.)
140	*
141	*/
142
143
144	/*********************************************************************************************************************************
145	* Header Files *
146	*********************************************************************************************************************************/
147	#define LOG_GROUP LOG_GROUP_MM
148	#include <VBox/vmm/mm.h>
149	#include <VBox/vmm/pgm.h>
150	#include <VBox/vmm/cfgm.h>
151	#include <VBox/vmm/ssm.h>
152	#include <VBox/vmm/gmm.h>
153	#include "MMInternal.h"
154	#include <VBox/vmm/vm.h>
155	#include <VBox/vmm/uvm.h>
156	#include <VBox/err.h>
157	#include <VBox/param.h>
158
159	#include <VBox/log.h>
160	#include <iprt/alloc.h>
161	#include <iprt/assert.h>
162	#include <iprt/string.h>
163
164
165	/*********************************************************************************************************************************
166	* Defined Constants And Macros *
167	*********************************************************************************************************************************/
168	/** The current saved state version of MM. */
169	#define MM_SAVED_STATE_VERSION 2
170
171
172	/*********************************************************************************************************************************
173	* Internal Functions *
174	*********************************************************************************************************************************/
175	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM);
176	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
177
178
179
180
181	/**
182	* Initializes the MM members of the UVM.
183	*
184	* This is currently only the ring-3 heap.
185	*
186	* @returns VBox status code.
187	* @param pUVM Pointer to the user mode VM structure.
188	*/
189	VMMR3DECL(int) MMR3InitUVM(PUVM pUVM)
190	{
191	/*
192	* Assert sizes and order.
193	*/
194	AssertCompile(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
195	AssertRelease(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
196	Assert(!pUVM->mm.s.pHeap);
197
198	/*
199	* Init the heap.
200	*/
201	int rc = mmR3HeapCreateU(pUVM, &pUVM->mm.s.pHeap);
202	if (RT_SUCCESS(rc))
203	return VINF_SUCCESS;
204	return rc;
205	}
206
207
208	/**
209	* Initializes the MM.
210	*
211	* MM is managing the virtual address space (among other things) and
212	* setup the hypervisor memory area mapping in the VM structure and
213	* the hypervisor alloc-only-heap. Assuming the current init order
214	* and components the hypervisor memory area looks like this:
215	* -# VM Structure.
216	* -# Hypervisor alloc only heap (also call Hypervisor memory region).
217	* -# Core code.
218	*
219	* MM determines the virtual address of the hypervisor memory area by
220	* checking for location at previous run. If that property isn't available
221	* it will choose a default starting location, currently 0xa0000000.
222	*
223	* @returns VBox status code.
224	* @param pVM The cross context VM structure.
225	*/
226	VMMR3DECL(int) MMR3Init(PVM pVM)
227	{
228	LogFlow(("MMR3Init\n"));
229
230	/*
231	* Assert alignment, sizes and order.
232	*/
233	AssertRelease(!(RT_UOFFSETOF(VM, mm.s) & 31));
234	AssertRelease(sizeof(pVM->mm.s) <= sizeof(pVM->mm.padding));
235
236	/*
237	* Register the saved state data unit.
238	*/
239	int rc = SSMR3RegisterInternal(pVM, "mm", 1, MM_SAVED_STATE_VERSION, sizeof(uint32_t) * 2,
240	NULL, NULL, NULL,
241	NULL, mmR3Save, NULL,
242	NULL, mmR3Load, NULL);
243	if (RT_SUCCESS(rc))
244	{
245	/*
246	* Statistics.
247	*/
248	STAM_REG(pVM, &pVM->mm.s.cBasePages, STAMTYPE_U64, "/MM/Reserved/cBasePages", STAMUNIT_PAGES, "Reserved number of base pages, ROM and Shadow ROM included.");
249	STAM_REG(pVM, &pVM->mm.s.cHandyPages, STAMTYPE_U32, "/MM/Reserved/cHandyPages", STAMUNIT_PAGES, "Reserved number of handy pages.");
250	STAM_REG(pVM, &pVM->mm.s.cShadowPages, STAMTYPE_U32, "/MM/Reserved/cShadowPages", STAMUNIT_PAGES, "Reserved number of shadow paging pages.");
251	STAM_REG(pVM, &pVM->mm.s.cFixedPages, STAMTYPE_U32, "/MM/Reserved/cFixedPages", STAMUNIT_PAGES, "Reserved number of fixed pages (MMIO2).");
252	STAM_REG(pVM, &pVM->mm.s.cbRamBase, STAMTYPE_U64, "/MM/cbRamBase", STAMUNIT_BYTES, "Size of the base RAM.");
253
254	return rc;
255	}
256
257	return rc;
258	}
259
260
261	/**
262	* Initializes the MM parts which depends on PGM being initialized.
263	*
264	* @returns VBox status code.
265	* @param pVM The cross context VM structure.
266	* @remark No cleanup necessary since MMR3Term() will be called on failure.
267	*/
268	VMMR3DECL(int) MMR3InitPaging(PVM pVM)
269	{
270	LogFlow(("MMR3InitPaging:\n"));
271
272	/*
273	* Query the CFGM values.
274	*/
275	int rc;
276	PCFGMNODE pMMCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "MM");
277	if (!pMMCfg)
278	{
279	rc = CFGMR3InsertNode(CFGMR3GetRoot(pVM), "MM", &pMMCfg);
280	AssertRCReturn(rc, rc);
281	}
282
283	/** @cfgm{/RamSize, uint64_t, 0, 16TB, 0}
284	* Specifies the size of the base RAM that is to be set up during
285	* VM initialization.
286	*/
287	uint64_t cbRam;
288	rc = CFGMR3QueryU64(CFGMR3GetRoot(pVM), "RamSize", &cbRam);
289	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
290	cbRam = 0;
291	else
292	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamSize\", rc=%Rrc.\n", rc), rc);
293	AssertLogRelMsg(!(cbRam & ~X86_PTE_PAE_PG_MASK), ("%RGp X86_PTE_PAE_PG_MASK=%RX64\n", cbRam, X86_PTE_PAE_PG_MASK));
294	AssertLogRelMsgReturn(cbRam <= GMM_GCPHYS_LAST, ("cbRam=%RGp GMM_GCPHYS_LAST=%RX64\n", cbRam, GMM_GCPHYS_LAST), VERR_OUT_OF_RANGE);
295	cbRam &= X86_PTE_PAE_PG_MASK;
296	pVM->mm.s.cbRamBase = cbRam;
297
298	/** @cfgm{/RamHoleSize, uint32_t, 0, 4032MB, 512MB}
299	* Specifies the size of the memory hole. The memory hole is used
300	* to avoid mapping RAM to the range normally used for PCI memory regions.
301	* Must be aligned on a 4MB boundary. */
302	uint32_t cbRamHole;
303	rc = CFGMR3QueryU32Def(CFGMR3GetRoot(pVM), "RamHoleSize", &cbRamHole, MM_RAM_HOLE_SIZE_DEFAULT);
304	AssertLogRelMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamHoleSize\", rc=%Rrc.\n", rc), rc);
305	AssertLogRelMsgReturn(cbRamHole <= 4032U * _1M,
306	("Configuration error: \"RamHoleSize\"=%#RX32 is too large.\n", cbRamHole), VERR_OUT_OF_RANGE);
307	AssertLogRelMsgReturn(cbRamHole > 16 * _1M,
308	("Configuration error: \"RamHoleSize\"=%#RX32 is too large.\n", cbRamHole), VERR_OUT_OF_RANGE);
309	AssertLogRelMsgReturn(!(cbRamHole & (_4M - 1)),
310	("Configuration error: \"RamHoleSize\"=%#RX32 is misaligned.\n", cbRamHole), VERR_OUT_OF_RANGE);
311	uint64_t const offRamHole = _4G - cbRamHole;
312	if (cbRam < offRamHole)
313	Log(("MM: %RU64 bytes of RAM\n", cbRam));
314	else
315	Log(("MM: %RU64 bytes of RAM with a hole at %RU64 up to 4GB.\n", cbRam, offRamHole));
316
317	/** @cfgm{/MM/Policy, string, no overcommitment}
318	* Specifies the policy to use when reserving memory for this VM. The recognized
319	* value is 'no overcommitment' (default). See GMMPOLICY.
320	*/
321	GMMOCPOLICY enmOcPolicy;
322	char sz[64];
323	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Policy", sz, sizeof(sz));
324	if (RT_SUCCESS(rc))
325	{
326	if ( !RTStrICmp(sz, "no_oc")
327	\|\| !RTStrICmp(sz, "no overcommitment"))
328	enmOcPolicy = GMMOCPOLICY_NO_OC;
329	else
330	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Policy\" value \"%s\"", sz);
331	}
332	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
333	enmOcPolicy = GMMOCPOLICY_NO_OC;
334	else
335	AssertMsgFailedReturn(("Configuration error: Failed to query string \"MM/Policy\", rc=%Rrc.\n", rc), rc);
336
337	/** @cfgm{/MM/Priority, string, normal}
338	* Specifies the memory priority of this VM. The priority comes into play when the
339	* system is overcommitted and the VMs needs to be milked for memory. The recognized
340	* values are 'low', 'normal' (default) and 'high'. See GMMPRIORITY.
341	*/
342	GMMPRIORITY enmPriority;
343	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Priority", sz, sizeof(sz));
344	if (RT_SUCCESS(rc))
345	{
346	if (!RTStrICmp(sz, "low"))
347	enmPriority = GMMPRIORITY_LOW;
348	else if (!RTStrICmp(sz, "normal"))
349	enmPriority = GMMPRIORITY_NORMAL;
350	else if (!RTStrICmp(sz, "high"))
351	enmPriority = GMMPRIORITY_HIGH;
352	else
353	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Priority\" value \"%s\"", sz);
354	}
355	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
356	enmPriority = GMMPRIORITY_NORMAL;
357	else
358	AssertMsgFailedReturn(("Configuration error: Failed to query string \"MM/Priority\", rc=%Rrc.\n", rc), rc);
359
360	/*
361	* Make the initial memory reservation with GMM.
362	*/
363	uint32_t const cbUma = _1M - 640*_1K;
364	uint64_t cBasePages = ((cbRam - cbUma) >> GUEST_PAGE_SHIFT) + pVM->mm.s.cBasePages;
365	rc = GMMR3InitialReservation(pVM,
366	RT_MAX(cBasePages + pVM->mm.s.cHandyPages, 1),
367	RT_MAX(pVM->mm.s.cShadowPages, 1),
368	RT_MAX(pVM->mm.s.cFixedPages, 1),
369	enmOcPolicy,
370	enmPriority);
371	if (RT_FAILURE(rc))
372	{
373	if (rc == VERR_GMM_MEMORY_RESERVATION_DECLINED)
374	return VMSetError(pVM, rc, RT_SRC_POS,
375	N_("Insufficient free memory to start the VM (cbRam=%#RX64 enmOcPolicy=%d enmPriority=%d)"),
376	cbRam, enmOcPolicy, enmPriority);
377	return VMSetError(pVM, rc, RT_SRC_POS, "GMMR3InitialReservation(,%#RX64,0,0,%d,%d)",
378	cbRam >> GUEST_PAGE_SHIFT, enmOcPolicy, enmPriority);
379	}
380
381	/*
382	* If RamSize is 0 we're done now.
383	*/
384	if (cbRam < GUEST_PAGE_SIZE)
385	{
386	Log(("MM: No RAM configured\n"));
387	return VINF_SUCCESS;
388	}
389
390	/*
391	* Setup the base ram (PGM).
392	*/
393	pVM->mm.s.cbRamHole = cbRamHole;
394	pVM->mm.s.cbRamBelow4GB = cbRam > offRamHole ? offRamHole : cbRam;
395	pVM->mm.s.cbRamAbove4GB = cbRam > offRamHole ? cbRam - offRamHole : 0;
396
397	/* First the conventional memory: */
398	rc = PGMR3PhysRegisterRam(pVM, 0, RT_MIN(cbRam, 640*_1K), "Conventional RAM");
399	if (RT_SUCCESS(rc) && cbRam >= _1M)
400	{
401	/* The extended memory from 1MiB to 2MiB to align better with large pages in NEM mode: */
402	rc = PGMR3PhysRegisterRam(pVM, _1M, RT_MIN(_1M, cbRam - _1M), "Extended RAM, 1-2MB");
403	if (cbRam > _2M)
404	{
405	/* The extended memory from 2MiB up to 4GiB: */
406	rc = PGMR3PhysRegisterRam(pVM, _2M, pVM->mm.s.cbRamBelow4GB - _2M, "Extended RAM, >2MB");
407
408	/* Then all the memory above 4GiB: */
409	if (RT_SUCCESS(rc) && pVM->mm.s.cbRamAbove4GB > 0)
410	rc = PGMR3PhysRegisterRam(pVM, _4G, cbRam - offRamHole, "Above 4GB Base RAM");
411	}
412	}
413
414	/*
415	* Enabled mmR3UpdateReservation here since we don't want the
416	* PGMR3PhysRegisterRam calls above mess things up.
417	*/
418	pVM->mm.s.fDoneMMR3InitPaging = true;
419	AssertMsg(pVM->mm.s.cBasePages == cBasePages \|\| RT_FAILURE(rc), ("%RX64 != %RX64\n", pVM->mm.s.cBasePages, cBasePages));
420
421	LogFlow(("MMR3InitPaging: returns %Rrc\n", rc));
422	return rc;
423	}
424
425
426	/**
427	* Terminates the MM.
428	*
429	* Termination means cleaning up and freeing all resources,
430	* the VM it self is at this point powered off or suspended.
431	*
432	* @returns VBox status code.
433	* @param pVM The cross context VM structure.
434	*/
435	VMMR3DECL(int) MMR3Term(PVM pVM)
436	{
437	RT_NOREF(pVM);
438	return VINF_SUCCESS;
439	}
440
441
442	/**
443	* Terminates the UVM part of MM.
444	*
445	* Termination means cleaning up and freeing all resources,
446	* the VM it self is at this point powered off or suspended.
447	*
448	* @returns VBox status code.
449	* @param pUVM Pointer to the user mode VM structure.
450	*/
451	VMMR3DECL(void) MMR3TermUVM(PUVM pUVM)
452	{
453	/*
454	* Destroy the heap.
455	*/
456	mmR3HeapDestroy(pUVM->mm.s.pHeap);
457	pUVM->mm.s.pHeap = NULL;
458	}
459
460
461	/**
462	* Execute state save operation.
463	*
464	* @returns VBox status code.
465	* @param pVM The cross context VM structure.
466	* @param pSSM SSM operation handle.
467	*/
468	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM)
469	{
470	LogFlow(("mmR3Save:\n"));
471
472	/* (PGM saves the physical memory.) */
473	SSMR3PutU64(pSSM, pVM->mm.s.cBasePages);
474	return SSMR3PutU64(pSSM, pVM->mm.s.cbRamBase);
475	}
476
477
478	/**
479	* Execute state load operation.
480	*
481	* @returns VBox status code.
482	* @param pVM The cross context VM structure.
483	* @param pSSM SSM operation handle.
484	* @param uVersion Data layout version.
485	* @param uPass The data pass.
486	*/
487	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
488	{
489	LogFlow(("mmR3Load:\n"));
490	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
491
492	/*
493	* Validate version.
494	*/
495	if ( SSM_VERSION_MAJOR_CHANGED(uVersion, MM_SAVED_STATE_VERSION)
496	\|\| !uVersion)
497	{
498	AssertMsgFailed(("mmR3Load: Invalid version uVersion=%d!\n", uVersion));
499	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
500	}
501
502	/*
503	* Check the cBasePages and cbRamBase values.
504	*/
505	int rc;
506	RTUINT cb1;
507
508	/* cBasePages (ignored) */
509	uint64_t cGuestPages;
510	if (uVersion >= 2)
511	rc = SSMR3GetU64(pSSM, &cGuestPages);
512	else
513	{
514	rc = SSMR3GetUInt(pSSM, &cb1);
515	cGuestPages = cb1 >> GUEST_PAGE_SHIFT;
516	}
517	if (RT_FAILURE(rc))
518	return rc;
519
520	/* cbRamBase */
521	uint64_t cb;
522	if (uVersion != 1)
523	rc = SSMR3GetU64(pSSM, &cb);
524	else
525	{
526	rc = SSMR3GetUInt(pSSM, &cb1);
527	cb = cb1;
528	}
529	if (RT_FAILURE(rc))
530	return rc;
531	AssertLogRelMsgReturn(cb == pVM->mm.s.cbRamBase,
532	("Memory configuration has changed. cbRamBase=%#RX64 save=%#RX64\n", pVM->mm.s.cbRamBase, cb),
533	VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH);
534
535	/* (PGM restores the physical memory.) */
536	return rc;
537	}
538
539
540	/**
541	* Updates GMM with memory reservation changes.
542	*
543	* Called when MM::cbRamRegistered, MM::cShadowPages or MM::cFixedPages changes.
544	*
545	* @returns VBox status code - see GMMR0UpdateReservation.
546	* @param pVM The cross context VM structure.
547	*/
548	int mmR3UpdateReservation(PVM pVM)
549	{
550	VM_ASSERT_EMT(pVM);
551	if (pVM->mm.s.fDoneMMR3InitPaging)
552	return GMMR3UpdateReservation(pVM,
553	RT_MAX(pVM->mm.s.cBasePages + pVM->mm.s.cHandyPages, 1),
554	RT_MAX(pVM->mm.s.cShadowPages, 1),
555	RT_MAX(pVM->mm.s.cFixedPages, 1));
556	return VINF_SUCCESS;
557	}
558
559
560	/**
561	* Interface for PGM to increase the reservation of RAM and ROM pages.
562	*
563	* This can be called before MMR3InitPaging.
564	*
565	* @returns VBox status code. Will set VM error on failure.
566	* @param pVM The cross context VM structure.
567	* @param cAddBasePages The number of pages to add.
568	*/
569	VMMR3DECL(int) MMR3IncreaseBaseReservation(PVM pVM, uint64_t cAddBasePages)
570	{
571	uint64_t cOld = pVM->mm.s.cBasePages;
572	pVM->mm.s.cBasePages += cAddBasePages;
573	LogFlow(("MMR3IncreaseBaseReservation: +%RU64 (%RU64 -> %RU64)\n", cAddBasePages, cOld, pVM->mm.s.cBasePages));
574	int rc = mmR3UpdateReservation(pVM);
575	if (RT_FAILURE(rc))
576	{
577	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserved physical memory for the RAM (%#RX64 -> %#RX64 + %#RX32)"),
578	cOld, pVM->mm.s.cBasePages, pVM->mm.s.cHandyPages);
579	pVM->mm.s.cBasePages = cOld;
580	}
581	return rc;
582	}
583
584
585	/**
586	* Interface for PGM to make reservations for handy pages in addition to the
587	* base memory.
588	*
589	* This can be called before MMR3InitPaging.
590	*
591	* @returns VBox status code. Will set VM error on failure.
592	* @param pVM The cross context VM structure.
593	* @param cHandyPages The number of handy pages.
594	*/
595	VMMR3DECL(int) MMR3ReserveHandyPages(PVM pVM, uint32_t cHandyPages)
596	{
597	AssertReturn(!pVM->mm.s.cHandyPages, VERR_WRONG_ORDER);
598
599	pVM->mm.s.cHandyPages = cHandyPages;
600	LogFlow(("MMR3ReserveHandyPages: %RU32 (base %RU64)\n", pVM->mm.s.cHandyPages, pVM->mm.s.cBasePages));
601	int rc = mmR3UpdateReservation(pVM);
602	if (RT_FAILURE(rc))
603	{
604	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserved physical memory for the RAM (%#RX64 + %#RX32)"),
605	pVM->mm.s.cBasePages, pVM->mm.s.cHandyPages);
606	pVM->mm.s.cHandyPages = 0;
607	}
608	return rc;
609	}
610
611
612	/**
613	* Interface for PGM to adjust the reservation of fixed pages.
614	*
615	* This can be called before MMR3InitPaging.
616	*
617	* @returns VBox status code. Will set VM error on failure.
618	* @param pVM The cross context VM structure.
619	* @param cDeltaFixedPages The number of guest pages to add (positive) or
620	* subtract (negative).
621	* @param pszDesc Some description associated with the reservation.
622	*/
623	VMMR3DECL(int) MMR3AdjustFixedReservation(PVM pVM, int32_t cDeltaFixedPages, const char *pszDesc)
624	{
625	const uint32_t cOld = pVM->mm.s.cFixedPages;
626	pVM->mm.s.cFixedPages += cDeltaFixedPages;
627	LogFlow(("MMR3AdjustFixedReservation: %d (%u -> %u)\n", cDeltaFixedPages, cOld, pVM->mm.s.cFixedPages));
628	int rc = mmR3UpdateReservation(pVM);
629	if (RT_FAILURE(rc))
630	{
631	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory (%#x -> %#x; %s)"),
632	cOld, pVM->mm.s.cFixedPages, pszDesc);
633	pVM->mm.s.cFixedPages = cOld;
634	}
635	return rc;
636	}
637
638
639	/**
640	* Interface for PGM to update the reservation of shadow pages.
641	*
642	* This can be called before MMR3InitPaging.
643	*
644	* @returns VBox status code. Will set VM error on failure.
645	* @param pVM The cross context VM structure.
646	* @param cShadowPages The new page count.
647	*/
648	VMMR3DECL(int) MMR3UpdateShadowReservation(PVM pVM, uint32_t cShadowPages)
649	{
650	const uint32_t cOld = pVM->mm.s.cShadowPages;
651	pVM->mm.s.cShadowPages = cShadowPages;
652	LogFlow(("MMR3UpdateShadowReservation: %u -> %u\n", cOld, pVM->mm.s.cShadowPages));
653	int rc = mmR3UpdateReservation(pVM);
654	if (RT_FAILURE(rc))
655	{
656	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory for shadow page tables (%#x -> %#x)"), cOld, pVM->mm.s.cShadowPages);
657	pVM->mm.s.cShadowPages = cOld;
658	}
659	return rc;
660	}
661
662
663	/**
664	* Get the size of the base RAM.
665	* This usually means the size of the first contiguous block of physical memory.
666	*
667	* @returns The guest base RAM size.
668	* @param pVM The cross context VM structure.
669	* @thread Any.
670	*
671	* @deprecated
672	*/
673	VMMR3DECL(uint64_t) MMR3PhysGetRamSize(PVM pVM)
674	{
675	return pVM->mm.s.cbRamBase;
676	}
677
678
679	/**
680	* Get the size of RAM below 4GB (starts at address 0x00000000).
681	*
682	* @returns The amount of RAM below 4GB in bytes.
683	* @param pVM The cross context VM structure.
684	* @thread Any.
685	*/
686	VMMR3DECL(uint32_t) MMR3PhysGetRamSizeBelow4GB(PVM pVM)
687	{
688	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT32_MAX);
689	return pVM->mm.s.cbRamBelow4GB;
690	}
691
692
693	/**
694	* Get the size of RAM above 4GB (starts at address 0x000100000000).
695	*
696	* @returns The amount of RAM above 4GB in bytes.
697	* @param pVM The cross context VM structure.
698	* @thread Any.
699	*/
700	VMMR3DECL(uint64_t) MMR3PhysGetRamSizeAbove4GB(PVM pVM)
701	{
702	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT64_MAX);
703	return pVM->mm.s.cbRamAbove4GB;
704	}
705
706
707	/**
708	* Get the size of the RAM hole below 4GB.
709	*
710	* @returns Size in bytes.
711	* @param pVM The cross context VM structure.
712	* @thread Any.
713	*/
714	VMMR3DECL(uint32_t) MMR3PhysGet4GBRamHoleSize(PVM pVM)
715	{
716	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT32_MAX);
717	return pVM->mm.s.cbRamHole;
718	}
719

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source: vbox/trunk/src/VBox/VMM/VMMR3/MM.cpp@ 95843

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