MM.cpp@ 97405

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1	/* $Id: MM.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* MM - Memory Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/** @page pg_mm MM - The Memory Manager
30	*
31	* The memory manager is in charge of the following memory:
32	* - Hypervisor Memory Area (HMA) - Address space management (obsolete in 6.1).
33	* - Hypervisor Heap - A memory heap that lives in all contexts.
34	* - User-Kernel Heap - A memory heap lives in both host context.
35	* - Tagged ring-3 heap.
36	* - Page pools - Primarily used by PGM for shadow page tables.
37	* - Locked process memory - Guest RAM and other. (reduce/obsolete this)
38	* - Physical guest memory (RAM & ROM) - Moving to PGM. (obsolete this)
39	*
40	* The global memory manager (GMM) is the global counter part / partner of MM.
41	* MM will provide therefore ring-3 callable interfaces for some of the GMM APIs
42	* related to resource tracking (PGM is the user).
43	*
44	* @see grp_mm
45	*
46	*
47	* @section sec_mm_hma Hypervisor Memory Area - Obsolete in 6.1
48	*
49	* The HMA is used when executing in raw-mode. We borrow, with the help of
50	* PGMMap, some unused space (one or more page directory entries to be precise)
51	* in the guest's virtual memory context. PGM will monitor the guest's virtual
52	* address space for changes and relocate the HMA when required.
53	*
54	* To give some idea what's in the HMA, study the 'info hma' output:
55	* @verbatim
56	VBoxDbg> info hma
57	Hypervisor Memory Area (HMA) Layout: Base 00000000a0000000, 0x00800000 bytes
58	00000000a05cc000-00000000a05cd000 DYNAMIC fence
59	00000000a05c4000-00000000a05cc000 DYNAMIC Dynamic mapping
60	00000000a05c3000-00000000a05c4000 DYNAMIC fence
61	00000000a05b8000-00000000a05c3000 DYNAMIC Paging
62	00000000a05b6000-00000000a05b8000 MMIO2 0000000000000000 PCNetShMem
63	00000000a0536000-00000000a05b6000 MMIO2 0000000000000000 VGA VRam
64	00000000a0523000-00000000a0536000 00002aaab3d0c000 LOCKED autofree alloc once (PDM_DEVICE)
65	00000000a0522000-00000000a0523000 DYNAMIC fence
66	00000000a051e000-00000000a0522000 00002aaab36f5000 LOCKED autofree VBoxDD2RC.rc
67	00000000a051d000-00000000a051e000 DYNAMIC fence
68	00000000a04eb000-00000000a051d000 00002aaab36c3000 LOCKED autofree VBoxDDRC.rc
69	00000000a04ea000-00000000a04eb000 DYNAMIC fence
70	00000000a04e9000-00000000a04ea000 00002aaab36c2000 LOCKED autofree ram range (High ROM Region)
71	00000000a04e8000-00000000a04e9000 DYNAMIC fence
72	00000000a040e000-00000000a04e8000 00002aaab2e6d000 LOCKED autofree VMMRC.rc
73	00000000a0208000-00000000a040e000 00002aaab2c67000 LOCKED autofree alloc once (PATM)
74	00000000a01f7000-00000000a0208000 00002aaaab92d000 LOCKED autofree alloc once (SELM)
75	00000000a01e7000-00000000a01f7000 00002aaaab5e8000 LOCKED autofree alloc once (SELM)
76	00000000a01e6000-00000000a01e7000 DYNAMIC fence
77	00000000a01e5000-00000000a01e6000 00002aaaab5e7000 HCPHYS 00000000c363c000 Core Code
78	00000000a01e4000-00000000a01e5000 DYNAMIC fence
79	00000000a01e3000-00000000a01e4000 00002aaaaab26000 HCPHYS 00000000619cf000 GIP
80	00000000a01a2000-00000000a01e3000 00002aaaabf32000 LOCKED autofree alloc once (PGM_PHYS)
81	00000000a016b000-00000000a01a2000 00002aaab233f000 LOCKED autofree alloc once (PGM_POOL)
82	00000000a016a000-00000000a016b000 DYNAMIC fence
83	00000000a0165000-00000000a016a000 DYNAMIC CR3 mapping
84	00000000a0164000-00000000a0165000 DYNAMIC fence
85	00000000a0024000-00000000a0164000 00002aaab215f000 LOCKED autofree Heap
86	00000000a0023000-00000000a0024000 DYNAMIC fence
87	00000000a0001000-00000000a0023000 00002aaab1d24000 LOCKED pages VM
88	00000000a0000000-00000000a0001000 DYNAMIC fence
89	@endverbatim
90	*
91	*
92	* @section sec_mm_hyperheap Hypervisor Heap
93	*
94	* The heap is accessible from ring-3, ring-0 and the raw-mode context. That
95	* said, it's not necessarily mapped into ring-0 on if that's possible since we
96	* don't wish to waste kernel address space without a good reason.
97	*
98	* Allocations within the heap are always in the same relative position in all
99	* contexts, so, it's possible to use offset based linking. In fact, the heap is
100	* internally using offset based linked lists tracking heap blocks. We use
101	* offset linked AVL trees and lists in a lot of places where share structures
102	* between RC, R3 and R0, so this is a strict requirement of the heap. However
103	* this means that we cannot easily extend the heap since the extension won't
104	* necessarily be in the continuation of the current heap memory in all (or any)
105	* context.
106	*
107	* All allocations are tagged. Per tag allocation statistics will be maintaining
108	* and exposed thru STAM when VBOX_WITH_STATISTICS is defined.
109	*
110	*
111	* @section sec_mm_r3heap Tagged Ring-3 Heap
112	*
113	* The ring-3 heap is a wrapper around the RTMem API adding allocation
114	* statistics and automatic cleanup on VM destruction.
115	*
116	* Per tag allocation statistics will be maintaining and exposed thru STAM when
117	* VBOX_WITH_STATISTICS is defined.
118	*
119	*
120	* @section sec_mm_page Page Pool
121	*
122	* The MM manages a page pool from which other components can allocate locked,
123	* page aligned and page sized memory objects. The pool provides facilities to
124	* convert back and forth between (host) physical and virtual addresses (within
125	* the pool of course). Several specialized interfaces are provided for the most
126	* common allocations and conversions to save the caller from bothersome casting
127	* and extra parameter passing.
128	*
129	*
130	* @section sec_mm_locked Locked Process Memory
131	*
132	* MM manages the locked process memory. This is used for a bunch of things
133	* (count the LOCKED entries in the 'info hma' output found in @ref sec_mm_hma),
134	* but the main consumer of memory is currently for guest RAM. There is an
135	* ongoing rewrite that will move all the guest RAM allocation to PGM and
136	* GMM.
137	*
138	* The locking of memory is something doing in cooperation with the VirtualBox
139	* support driver, SUPDrv (aka. VBoxDrv), thru the support library API,
140	* SUPR3 (aka. SUPLib).
141	*
142	*
143	* @section sec_mm_phys Physical Guest Memory
144	*
145	* MM is currently managing the physical memory for the guest. It relies heavily
146	* on PGM for this. There is an ongoing rewrite that will move this to PGM. (The
147	* rewrite is driven by the need for more flexible guest ram allocation, but
148	* also motivated by the fact that MMPhys is just adding stupid bureaucracy and
149	* that MMR3PhysReserve is a totally weird artifact that must go away.)
150	*
151	*/
152
153
154	/*********************************************************************************************************************************
155	* Header Files *
156	*********************************************************************************************************************************/
157	#define LOG_GROUP LOG_GROUP_MM
158	#include <VBox/vmm/mm.h>
159	#include <VBox/vmm/pgm.h>
160	#include <VBox/vmm/cfgm.h>
161	#include <VBox/vmm/ssm.h>
162	#include <VBox/vmm/gmm.h>
163	#include "MMInternal.h"
164	#include <VBox/vmm/vm.h>
165	#include <VBox/vmm/uvm.h>
166	#include <VBox/err.h>
167	#include <VBox/param.h>
168
169	#include <VBox/log.h>
170	#include <iprt/alloc.h>
171	#include <iprt/assert.h>
172	#include <iprt/string.h>
173
174
175	/*********************************************************************************************************************************
176	* Defined Constants And Macros *
177	*********************************************************************************************************************************/
178	/** The current saved state version of MM. */
179	#define MM_SAVED_STATE_VERSION 2
180
181
182	/*********************************************************************************************************************************
183	* Internal Functions *
184	*********************************************************************************************************************************/
185	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM);
186	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
187
188
189
190
191	/**
192	* Initializes the MM members of the UVM.
193	*
194	* This is currently only the ring-3 heap.
195	*
196	* @returns VBox status code.
197	* @param pUVM Pointer to the user mode VM structure.
198	*/
199	VMMR3DECL(int) MMR3InitUVM(PUVM pUVM)
200	{
201	/*
202	* Assert sizes and order.
203	*/
204	AssertCompile(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
205	AssertRelease(sizeof(pUVM->mm.s) <= sizeof(pUVM->mm.padding));
206	Assert(!pUVM->mm.s.pHeap);
207
208	/*
209	* Init the heap.
210	*/
211	int rc = mmR3HeapCreateU(pUVM, &pUVM->mm.s.pHeap);
212	if (RT_SUCCESS(rc))
213	return VINF_SUCCESS;
214	return rc;
215	}
216
217
218	/**
219	* Initializes the MM.
220	*
221	* MM is managing the virtual address space (among other things) and
222	* setup the hypervisor memory area mapping in the VM structure and
223	* the hypervisor alloc-only-heap. Assuming the current init order
224	* and components the hypervisor memory area looks like this:
225	* -# VM Structure.
226	* -# Hypervisor alloc only heap (also call Hypervisor memory region).
227	* -# Core code.
228	*
229	* MM determines the virtual address of the hypervisor memory area by
230	* checking for location at previous run. If that property isn't available
231	* it will choose a default starting location, currently 0xa0000000.
232	*
233	* @returns VBox status code.
234	* @param pVM The cross context VM structure.
235	*/
236	VMMR3DECL(int) MMR3Init(PVM pVM)
237	{
238	LogFlow(("MMR3Init\n"));
239
240	/*
241	* Assert alignment, sizes and order.
242	*/
243	AssertRelease(!(RT_UOFFSETOF(VM, mm.s) & 31));
244	AssertRelease(sizeof(pVM->mm.s) <= sizeof(pVM->mm.padding));
245
246	/*
247	* Register the saved state data unit.
248	*/
249	int rc = SSMR3RegisterInternal(pVM, "mm", 1, MM_SAVED_STATE_VERSION, sizeof(uint32_t) * 2,
250	NULL, NULL, NULL,
251	NULL, mmR3Save, NULL,
252	NULL, mmR3Load, NULL);
253	if (RT_SUCCESS(rc))
254	{
255	/*
256	* Statistics.
257	*/
258	STAM_REG(pVM, &pVM->mm.s.cBasePages, STAMTYPE_U64, "/MM/Reserved/cBasePages", STAMUNIT_PAGES, "Reserved number of base pages, ROM and Shadow ROM included.");
259	STAM_REG(pVM, &pVM->mm.s.cHandyPages, STAMTYPE_U32, "/MM/Reserved/cHandyPages", STAMUNIT_PAGES, "Reserved number of handy pages.");
260	STAM_REG(pVM, &pVM->mm.s.cShadowPages, STAMTYPE_U32, "/MM/Reserved/cShadowPages", STAMUNIT_PAGES, "Reserved number of shadow paging pages.");
261	STAM_REG(pVM, &pVM->mm.s.cFixedPages, STAMTYPE_U32, "/MM/Reserved/cFixedPages", STAMUNIT_PAGES, "Reserved number of fixed pages (MMIO2).");
262	STAM_REG(pVM, &pVM->mm.s.cbRamBase, STAMTYPE_U64, "/MM/cbRamBase", STAMUNIT_BYTES, "Size of the base RAM.");
263
264	return rc;
265	}
266
267	return rc;
268	}
269
270
271	/**
272	* Initializes the MM parts which depends on PGM being initialized.
273	*
274	* @returns VBox status code.
275	* @param pVM The cross context VM structure.
276	* @remark No cleanup necessary since MMR3Term() will be called on failure.
277	*/
278	VMMR3DECL(int) MMR3InitPaging(PVM pVM)
279	{
280	LogFlow(("MMR3InitPaging:\n"));
281
282	/*
283	* Query the CFGM values.
284	*/
285	int rc;
286	PCFGMNODE pMMCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "MM");
287	if (!pMMCfg)
288	{
289	rc = CFGMR3InsertNode(CFGMR3GetRoot(pVM), "MM", &pMMCfg);
290	AssertRCReturn(rc, rc);
291	}
292
293	/** @cfgm{/RamSize, uint64_t, 0, 16TB, 0}
294	* Specifies the size of the base RAM that is to be set up during
295	* VM initialization.
296	*/
297	uint64_t cbRam;
298	rc = CFGMR3QueryU64(CFGMR3GetRoot(pVM), "RamSize", &cbRam);
299	if (rc == VERR_CFGM_VALUE_NOT_FOUND)
300	cbRam = 0;
301	else
302	AssertMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamSize\", rc=%Rrc.\n", rc), rc);
303	AssertLogRelMsg(!(cbRam & ~X86_PTE_PAE_PG_MASK), ("%RGp X86_PTE_PAE_PG_MASK=%RX64\n", cbRam, X86_PTE_PAE_PG_MASK));
304	AssertLogRelMsgReturn(cbRam <= GMM_GCPHYS_LAST, ("cbRam=%RGp GMM_GCPHYS_LAST=%RX64\n", cbRam, GMM_GCPHYS_LAST), VERR_OUT_OF_RANGE);
305	cbRam &= X86_PTE_PAE_PG_MASK;
306	pVM->mm.s.cbRamBase = cbRam;
307
308	/** @cfgm{/RamHoleSize, uint32_t, 0, 4032MB, 512MB}
309	* Specifies the size of the memory hole. The memory hole is used
310	* to avoid mapping RAM to the range normally used for PCI memory regions.
311	* Must be aligned on a 4MB boundary. */
312	uint32_t cbRamHole;
313	rc = CFGMR3QueryU32Def(CFGMR3GetRoot(pVM), "RamHoleSize", &cbRamHole, MM_RAM_HOLE_SIZE_DEFAULT);
314	AssertLogRelMsgRCReturn(rc, ("Configuration error: Failed to query integer \"RamHoleSize\", rc=%Rrc.\n", rc), rc);
315	AssertLogRelMsgReturn(cbRamHole <= 4032U * _1M,
316	("Configuration error: \"RamHoleSize\"=%#RX32 is too large.\n", cbRamHole), VERR_OUT_OF_RANGE);
317	AssertLogRelMsgReturn(cbRamHole > 16 * _1M,
318	("Configuration error: \"RamHoleSize\"=%#RX32 is too large.\n", cbRamHole), VERR_OUT_OF_RANGE);
319	AssertLogRelMsgReturn(!(cbRamHole & (_4M - 1)),
320	("Configuration error: \"RamHoleSize\"=%#RX32 is misaligned.\n", cbRamHole), VERR_OUT_OF_RANGE);
321	uint64_t const offRamHole = _4G - cbRamHole;
322	if (cbRam < offRamHole)
323	Log(("MM: %RU64 bytes of RAM\n", cbRam));
324	else
325	Log(("MM: %RU64 bytes of RAM with a hole at %RU64 up to 4GB.\n", cbRam, offRamHole));
326
327	/** @cfgm{/MM/Policy, string, no overcommitment}
328	* Specifies the policy to use when reserving memory for this VM. The recognized
329	* value is 'no overcommitment' (default). See GMMPOLICY.
330	*/
331	GMMOCPOLICY enmOcPolicy;
332	char sz[64];
333	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Policy", sz, sizeof(sz));
334	if (RT_SUCCESS(rc))
335	{
336	if ( !RTStrICmp(sz, "no_oc")
337	\|\| !RTStrICmp(sz, "no overcommitment"))
338	enmOcPolicy = GMMOCPOLICY_NO_OC;
339	else
340	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Policy\" value \"%s\"", sz);
341	}
342	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
343	enmOcPolicy = GMMOCPOLICY_NO_OC;
344	else
345	AssertMsgFailedReturn(("Configuration error: Failed to query string \"MM/Policy\", rc=%Rrc.\n", rc), rc);
346
347	/** @cfgm{/MM/Priority, string, normal}
348	* Specifies the memory priority of this VM. The priority comes into play when the
349	* system is overcommitted and the VMs needs to be milked for memory. The recognized
350	* values are 'low', 'normal' (default) and 'high'. See GMMPRIORITY.
351	*/
352	GMMPRIORITY enmPriority;
353	rc = CFGMR3QueryString(CFGMR3GetRoot(pVM), "Priority", sz, sizeof(sz));
354	if (RT_SUCCESS(rc))
355	{
356	if (!RTStrICmp(sz, "low"))
357	enmPriority = GMMPRIORITY_LOW;
358	else if (!RTStrICmp(sz, "normal"))
359	enmPriority = GMMPRIORITY_NORMAL;
360	else if (!RTStrICmp(sz, "high"))
361	enmPriority = GMMPRIORITY_HIGH;
362	else
363	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, "Unknown \"MM/Priority\" value \"%s\"", sz);
364	}
365	else if (rc == VERR_CFGM_VALUE_NOT_FOUND)
366	enmPriority = GMMPRIORITY_NORMAL;
367	else
368	AssertMsgFailedReturn(("Configuration error: Failed to query string \"MM/Priority\", rc=%Rrc.\n", rc), rc);
369
370	/*
371	* Make the initial memory reservation with GMM.
372	*/
373	uint32_t const cbUma = _1M - 640*_1K;
374	uint64_t cBasePages = ((cbRam - cbUma) >> GUEST_PAGE_SHIFT) + pVM->mm.s.cBasePages;
375	rc = GMMR3InitialReservation(pVM,
376	RT_MAX(cBasePages + pVM->mm.s.cHandyPages, 1),
377	RT_MAX(pVM->mm.s.cShadowPages, 1),
378	RT_MAX(pVM->mm.s.cFixedPages, 1),
379	enmOcPolicy,
380	enmPriority);
381	if (RT_FAILURE(rc))
382	{
383	if (rc == VERR_GMM_MEMORY_RESERVATION_DECLINED)
384	return VMSetError(pVM, rc, RT_SRC_POS,
385	N_("Insufficient free memory to start the VM (cbRam=%#RX64 enmOcPolicy=%d enmPriority=%d)"),
386	cbRam, enmOcPolicy, enmPriority);
387	return VMSetError(pVM, rc, RT_SRC_POS, "GMMR3InitialReservation(,%#RX64,0,0,%d,%d)",
388	cbRam >> GUEST_PAGE_SHIFT, enmOcPolicy, enmPriority);
389	}
390
391	/*
392	* If RamSize is 0 we're done now.
393	*/
394	if (cbRam < GUEST_PAGE_SIZE)
395	{
396	Log(("MM: No RAM configured\n"));
397	return VINF_SUCCESS;
398	}
399
400	/*
401	* Setup the base ram (PGM).
402	*/
403	pVM->mm.s.cbRamHole = cbRamHole;
404	pVM->mm.s.cbRamBelow4GB = cbRam > offRamHole ? offRamHole : cbRam;
405	pVM->mm.s.cbRamAbove4GB = cbRam > offRamHole ? cbRam - offRamHole : 0;
406
407	/* First the conventional memory: */
408	rc = PGMR3PhysRegisterRam(pVM, 0, RT_MIN(cbRam, 640*_1K), "Conventional RAM");
409	if (RT_SUCCESS(rc) && cbRam >= _1M)
410	{
411	/* The extended memory from 1MiB to 2MiB to align better with large pages in NEM mode: */
412	rc = PGMR3PhysRegisterRam(pVM, _1M, RT_MIN(_1M, cbRam - _1M), "Extended RAM, 1-2MB");
413	if (cbRam > _2M)
414	{
415	/* The extended memory from 2MiB up to 4GiB: */
416	rc = PGMR3PhysRegisterRam(pVM, _2M, pVM->mm.s.cbRamBelow4GB - _2M, "Extended RAM, >2MB");
417
418	/* Then all the memory above 4GiB: */
419	if (RT_SUCCESS(rc) && pVM->mm.s.cbRamAbove4GB > 0)
420	rc = PGMR3PhysRegisterRam(pVM, _4G, cbRam - offRamHole, "Above 4GB Base RAM");
421	}
422	}
423
424	/*
425	* Enabled mmR3UpdateReservation here since we don't want the
426	* PGMR3PhysRegisterRam calls above mess things up.
427	*/
428	pVM->mm.s.fDoneMMR3InitPaging = true;
429	AssertMsg(pVM->mm.s.cBasePages == cBasePages \|\| RT_FAILURE(rc), ("%RX64 != %RX64\n", pVM->mm.s.cBasePages, cBasePages));
430
431	LogFlow(("MMR3InitPaging: returns %Rrc\n", rc));
432	return rc;
433	}
434
435
436	/**
437	* Terminates the MM.
438	*
439	* Termination means cleaning up and freeing all resources,
440	* the VM it self is at this point powered off or suspended.
441	*
442	* @returns VBox status code.
443	* @param pVM The cross context VM structure.
444	*/
445	VMMR3DECL(int) MMR3Term(PVM pVM)
446	{
447	RT_NOREF(pVM);
448	return VINF_SUCCESS;
449	}
450
451
452	/**
453	* Terminates the UVM part of MM.
454	*
455	* Termination means cleaning up and freeing all resources,
456	* the VM it self is at this point powered off or suspended.
457	*
458	* @returns VBox status code.
459	* @param pUVM Pointer to the user mode VM structure.
460	*/
461	VMMR3DECL(void) MMR3TermUVM(PUVM pUVM)
462	{
463	/*
464	* Destroy the heap.
465	*/
466	mmR3HeapDestroy(pUVM->mm.s.pHeap);
467	pUVM->mm.s.pHeap = NULL;
468	}
469
470
471	/**
472	* Execute state save operation.
473	*
474	* @returns VBox status code.
475	* @param pVM The cross context VM structure.
476	* @param pSSM SSM operation handle.
477	*/
478	static DECLCALLBACK(int) mmR3Save(PVM pVM, PSSMHANDLE pSSM)
479	{
480	LogFlow(("mmR3Save:\n"));
481
482	/* (PGM saves the physical memory.) */
483	SSMR3PutU64(pSSM, pVM->mm.s.cBasePages);
484	return SSMR3PutU64(pSSM, pVM->mm.s.cbRamBase);
485	}
486
487
488	/**
489	* Execute state load operation.
490	*
491	* @returns VBox status code.
492	* @param pVM The cross context VM structure.
493	* @param pSSM SSM operation handle.
494	* @param uVersion Data layout version.
495	* @param uPass The data pass.
496	*/
497	static DECLCALLBACK(int) mmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
498	{
499	LogFlow(("mmR3Load:\n"));
500	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
501
502	/*
503	* Validate version.
504	*/
505	if ( SSM_VERSION_MAJOR_CHANGED(uVersion, MM_SAVED_STATE_VERSION)
506	\|\| !uVersion)
507	{
508	AssertMsgFailed(("mmR3Load: Invalid version uVersion=%d!\n", uVersion));
509	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
510	}
511
512	/*
513	* Check the cBasePages and cbRamBase values.
514	*/
515	int rc;
516	RTUINT cb1;
517
518	/* cBasePages (ignored) */
519	uint64_t cGuestPages;
520	if (uVersion >= 2)
521	rc = SSMR3GetU64(pSSM, &cGuestPages);
522	else
523	{
524	rc = SSMR3GetUInt(pSSM, &cb1);
525	cGuestPages = cb1 >> GUEST_PAGE_SHIFT;
526	}
527	if (RT_FAILURE(rc))
528	return rc;
529
530	/* cbRamBase */
531	uint64_t cb;
532	if (uVersion != 1)
533	rc = SSMR3GetU64(pSSM, &cb);
534	else
535	{
536	rc = SSMR3GetUInt(pSSM, &cb1);
537	cb = cb1;
538	}
539	if (RT_FAILURE(rc))
540	return rc;
541	AssertLogRelMsgReturn(cb == pVM->mm.s.cbRamBase,
542	("Memory configuration has changed. cbRamBase=%#RX64 save=%#RX64\n", pVM->mm.s.cbRamBase, cb),
543	VERR_SSM_LOAD_MEMORY_SIZE_MISMATCH);
544
545	/* (PGM restores the physical memory.) */
546	return rc;
547	}
548
549
550	/**
551	* Updates GMM with memory reservation changes.
552	*
553	* Called when MM::cbRamRegistered, MM::cShadowPages or MM::cFixedPages changes.
554	*
555	* @returns VBox status code - see GMMR0UpdateReservation.
556	* @param pVM The cross context VM structure.
557	*/
558	int mmR3UpdateReservation(PVM pVM)
559	{
560	VM_ASSERT_EMT(pVM);
561	if (pVM->mm.s.fDoneMMR3InitPaging)
562	return GMMR3UpdateReservation(pVM,
563	RT_MAX(pVM->mm.s.cBasePages + pVM->mm.s.cHandyPages, 1),
564	RT_MAX(pVM->mm.s.cShadowPages, 1),
565	RT_MAX(pVM->mm.s.cFixedPages, 1));
566	return VINF_SUCCESS;
567	}
568
569
570	/**
571	* Interface for PGM to increase the reservation of RAM and ROM pages.
572	*
573	* This can be called before MMR3InitPaging.
574	*
575	* @returns VBox status code. Will set VM error on failure.
576	* @param pVM The cross context VM structure.
577	* @param cAddBasePages The number of pages to add.
578	*/
579	VMMR3DECL(int) MMR3IncreaseBaseReservation(PVM pVM, uint64_t cAddBasePages)
580	{
581	uint64_t cOld = pVM->mm.s.cBasePages;
582	pVM->mm.s.cBasePages += cAddBasePages;
583	LogFlow(("MMR3IncreaseBaseReservation: +%RU64 (%RU64 -> %RU64)\n", cAddBasePages, cOld, pVM->mm.s.cBasePages));
584	int rc = mmR3UpdateReservation(pVM);
585	if (RT_FAILURE(rc))
586	{
587	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserved physical memory for the RAM (%#RX64 -> %#RX64 + %#RX32)"),
588	cOld, pVM->mm.s.cBasePages, pVM->mm.s.cHandyPages);
589	pVM->mm.s.cBasePages = cOld;
590	}
591	return rc;
592	}
593
594
595	/**
596	* Interface for PGM to make reservations for handy pages in addition to the
597	* base memory.
598	*
599	* This can be called before MMR3InitPaging.
600	*
601	* @returns VBox status code. Will set VM error on failure.
602	* @param pVM The cross context VM structure.
603	* @param cHandyPages The number of handy pages.
604	*/
605	VMMR3DECL(int) MMR3ReserveHandyPages(PVM pVM, uint32_t cHandyPages)
606	{
607	AssertReturn(!pVM->mm.s.cHandyPages, VERR_WRONG_ORDER);
608
609	pVM->mm.s.cHandyPages = cHandyPages;
610	LogFlow(("MMR3ReserveHandyPages: %RU32 (base %RU64)\n", pVM->mm.s.cHandyPages, pVM->mm.s.cBasePages));
611	int rc = mmR3UpdateReservation(pVM);
612	if (RT_FAILURE(rc))
613	{
614	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserved physical memory for the RAM (%#RX64 + %#RX32)"),
615	pVM->mm.s.cBasePages, pVM->mm.s.cHandyPages);
616	pVM->mm.s.cHandyPages = 0;
617	}
618	return rc;
619	}
620
621
622	/**
623	* Interface for PGM to adjust the reservation of fixed pages.
624	*
625	* This can be called before MMR3InitPaging.
626	*
627	* @returns VBox status code. Will set VM error on failure.
628	* @param pVM The cross context VM structure.
629	* @param cDeltaFixedPages The number of guest pages to add (positive) or
630	* subtract (negative).
631	* @param pszDesc Some description associated with the reservation.
632	*/
633	VMMR3DECL(int) MMR3AdjustFixedReservation(PVM pVM, int32_t cDeltaFixedPages, const char *pszDesc)
634	{
635	const uint32_t cOld = pVM->mm.s.cFixedPages;
636	pVM->mm.s.cFixedPages += cDeltaFixedPages;
637	LogFlow(("MMR3AdjustFixedReservation: %d (%u -> %u)\n", cDeltaFixedPages, cOld, pVM->mm.s.cFixedPages));
638	int rc = mmR3UpdateReservation(pVM);
639	if (RT_FAILURE(rc))
640	{
641	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory (%#x -> %#x; %s)"),
642	cOld, pVM->mm.s.cFixedPages, pszDesc);
643	pVM->mm.s.cFixedPages = cOld;
644	}
645	return rc;
646	}
647
648
649	/**
650	* Interface for PGM to update the reservation of shadow pages.
651	*
652	* This can be called before MMR3InitPaging.
653	*
654	* @returns VBox status code. Will set VM error on failure.
655	* @param pVM The cross context VM structure.
656	* @param cShadowPages The new page count.
657	*/
658	VMMR3DECL(int) MMR3UpdateShadowReservation(PVM pVM, uint32_t cShadowPages)
659	{
660	const uint32_t cOld = pVM->mm.s.cShadowPages;
661	pVM->mm.s.cShadowPages = cShadowPages;
662	LogFlow(("MMR3UpdateShadowReservation: %u -> %u\n", cOld, pVM->mm.s.cShadowPages));
663	int rc = mmR3UpdateReservation(pVM);
664	if (RT_FAILURE(rc))
665	{
666	VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to reserve physical memory for shadow page tables (%#x -> %#x)"), cOld, pVM->mm.s.cShadowPages);
667	pVM->mm.s.cShadowPages = cOld;
668	}
669	return rc;
670	}
671
672
673	/**
674	* Get the size of the base RAM.
675	* This usually means the size of the first contiguous block of physical memory.
676	*
677	* @returns The guest base RAM size.
678	* @param pVM The cross context VM structure.
679	* @thread Any.
680	*
681	* @deprecated
682	*/
683	VMMR3DECL(uint64_t) MMR3PhysGetRamSize(PVM pVM)
684	{
685	return pVM->mm.s.cbRamBase;
686	}
687
688
689	/**
690	* Get the size of RAM below 4GB (starts at address 0x00000000).
691	*
692	* @returns The amount of RAM below 4GB in bytes.
693	* @param pVM The cross context VM structure.
694	* @thread Any.
695	*/
696	VMMR3DECL(uint32_t) MMR3PhysGetRamSizeBelow4GB(PVM pVM)
697	{
698	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT32_MAX);
699	return pVM->mm.s.cbRamBelow4GB;
700	}
701
702
703	/**
704	* Get the size of RAM above 4GB (starts at address 0x000100000000).
705	*
706	* @returns The amount of RAM above 4GB in bytes.
707	* @param pVM The cross context VM structure.
708	* @thread Any.
709	*/
710	VMMR3DECL(uint64_t) MMR3PhysGetRamSizeAbove4GB(PVM pVM)
711	{
712	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT64_MAX);
713	return pVM->mm.s.cbRamAbove4GB;
714	}
715
716
717	/**
718	* Get the size of the RAM hole below 4GB.
719	*
720	* @returns Size in bytes.
721	* @param pVM The cross context VM structure.
722	* @thread Any.
723	*/
724	VMMR3DECL(uint32_t) MMR3PhysGet4GBRamHoleSize(PVM pVM)
725	{
726	VM_ASSERT_VALID_EXT_RETURN(pVM, UINT32_MAX);
727	return pVM->mm.s.cbRamHole;
728	}
729

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source: vbox/trunk/src/VBox/VMM/VMMR3/MM.cpp@ 97405

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