PGMPool.cpp@ 5285

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1	/* $Id: PGMPool.cpp 4071 2007-08-07 17:07:59Z vboxsync $ */
2	/** @file
3	* PGM Shadow Page Pool.
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_pgm_pool PGM Shadow Page Pool
19	*
20	* Motivations:
21	* -# Relationship between shadow page tables and physical guest pages. This
22	* should allow us to skip most of the global flushes now following access
23	* handler changes. The main expense is flushing shadow pages.
24	* -# Limit the pool size (currently it's kind of limitless IIRC).
25	* -# Allocate shadow pages from GC. Currently we're allocating at SyncCR3 time.
26	* -# Required for 64-bit guests.
27	* -# Combining the PD cache and page pool in order to simplify caching.
28	*
29	*
30	* @section sec_pgm_pool_outline Design Outline
31	*
32	* The shadow page pool tracks pages used for shadowing paging structures (i.e. page
33	* tables, page directory, page directory pointer table and page map level-4). Each
34	* page in the pool has an unique identifier. This identifier is used to link a guest
35	* physical page to a shadow PT. The identifier is a non-zero value and has a
36	* relativly low max value - say 14 bits. This makes it possible to fit it into the
37	* upper bits of the of the aHCPhys entries in the ram range.
38	*
39	* By restricting host physical memory to the first 48 bits (which is the announced
40	* physical memory range of the K8L chip (scheduled for 2008)), we can safely use the
41	* upper 16 bits for shadow page ID and reference counting.
42	*
43	* Now, it's possible for a page to be aliased, i.e. mapped by more than one PT or
44	* PD. This is solved by creating a list of physical cross reference extents when
45	* ever this happens. Each node in the list (extent) is can contain 3 page pool
46	* indexes. The list it self is chained using indexes into the paPhysExt array.
47	*
48	*
49	* @section sec_pgm_pool_life Life Cycle of a Shadow Page
50	*
51	* -# The SyncPT function requests a page from the pool.
52	* The request includes the kind of page it is (PT/PD, PAE/legacy), the
53	* address of the page it's shadowing, and more.
54	* -# The pool responds to the request by allocating a new page.
55	* When the cache is enabled, it will first check if it's in the cache.
56	* Should the pool be exhausted, one of two things can be done:
57	* -# Flush the whole pool and current CR3.
58	* -# Use the cache to find a page which can be flushed (~age).
59	* -# The SyncPT function will sync one or more pages and insert it into the
60	* shadow PD.
61	* -# The SyncPage function may sync more pages on a later \#PFs.
62	* -# The page is freed / flushed in SyncCR3 (perhaps) and some other cases.
63	* When caching is enabled, the page isn't flush but remains in the cache.
64	*
65	*
66	* @section sec_pgm_pool_impl Monitoring
67	*
68	* We always monitor PAGE_SIZE chunks of memory. When we've got multiple shadow
69	* pages for the same PAGE_SIZE of guest memory (PAE and mixed PD/PT) the pages
70	* sharing the monitor get linked using the iMonitoredNext/Prev. The head page
71	* is the pvUser to the access handlers.
72	*
73	*
74	* @section sec_pgm_pool_impl Implementation
75	*
76	* The pool will take pages from the MM page pool. The tracking data (attributes,
77	* bitmaps and so on) are allocated from the hypervisor heap. The pool content can
78	* be accessed both by using the page id and the physical address (HC). The former
79	* is managed by means of an array, the latter by an offset based AVL tree.
80	*
81	* Flushing of a pool page means that we iterate the content (we know what kind
82	* it is) and updates the link information in the ram range.
83	*
84	* ...
85	*/
86
87
88	/*******************************************************************************
89	* Header Files *
90	*******************************************************************************/
91	#define LOG_GROUP LOG_GROUP_PGM_POOL
92	#include <VBox/pgm.h>
93	#include <VBox/mm.h>
94	#include "PGMInternal.h"
95	#include <VBox/vm.h>
96
97	#include <VBox/log.h>
98	#include <VBox/err.h>
99	#include <iprt/asm.h>
100	#include <iprt/string.h>
101
102
103	/*******************************************************************************
104	* Internal Functions *
105	*******************************************************************************/
106	#ifdef PGMPOOL_WITH_MONITORING
107	static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
108	#endif /* PGMPOOL_WITH_MONITORING */
109
110
111	/**
112	* Initalizes the pool
113	*
114	* @returns VBox status code.
115	* @param pVM The VM handle.
116	*/
117	int pgmR3PoolInit(PVM pVM)
118	{
119	/*
120	* Query Pool config.
121	*/
122	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "/PGM/Pool");
123	uint16_t cMaxPages;
124	int rc = CFGMR3QueryU16(pCfg, "MaxPages", &cMaxPages);
125	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
126	cMaxPages = 4*_1M >> PAGE_SHIFT;
127	else if (VBOX_FAILURE(rc))
128	AssertRCReturn(rc, rc);
129	else
130	AssertMsgReturn(cMaxPages <= PGMPOOL_IDX_LAST && cMaxPages >= RT_ALIGN(PGMPOOL_IDX_FIRST, 16),
131	("cMaxPages=%u (%#x)\n", cMaxPages, cMaxPages), VERR_INVALID_PARAMETER);
132	cMaxPages = RT_ALIGN(cMaxPages, 16);
133
134	uint16_t cMaxUsers;
135	rc = CFGMR3QueryU16(pCfg, "MaxUsers", &cMaxUsers);
136	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
137	cMaxUsers = cMaxPages * 2;
138	else if (VBOX_FAILURE(rc))
139	AssertRCReturn(rc, rc);
140	else
141	AssertMsgReturn(cMaxUsers >= cMaxPages && cMaxPages <= _32K,
142	("cMaxUsers=%u (%#x)\n", cMaxUsers, cMaxUsers), VERR_INVALID_PARAMETER);
143
144	uint16_t cMaxPhysExts;
145	rc = CFGMR3QueryU16(pCfg, "MaxPhysExts", &cMaxPhysExts);
146	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
147	cMaxPhysExts = RT_MAX(cMaxPages * 2, PGMPOOL_IDX_LAST);
148	else if (VBOX_FAILURE(rc))
149	AssertRCReturn(rc, rc);
150	else
151	AssertMsgReturn(cMaxPhysExts >= 16 && cMaxPages <= PGMPOOL_IDX_LAST,
152	("cMaxPhysExts=%u (%#x)\n", cMaxPhysExts, cMaxUsers), VERR_INVALID_PARAMETER);
153
154	bool fCacheEnabled;
155	rc = CFGMR3QueryBool(pCfg, "CacheEnabled", &fCacheEnabled);
156	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
157	fCacheEnabled = true;
158	else if (VBOX_FAILURE(rc))
159	AssertRCReturn(rc, rc);
160
161	Log(("pgmR3PoolInit: cMaxPages=%#RX16 cMaxUsers=%#RX16 cMaxPhysExts=%#RX16 fCacheEnable=%RTbool\n",
162	cMaxPages, cMaxUsers, cMaxPhysExts, fCacheEnabled));
163
164	/*
165	* Allocate the data structures.
166	*/
167	uint32_t cb = RT_OFFSETOF(PGMPOOL, aPages[cMaxPages]);
168	#ifdef PGMPOOL_WITH_USER_TRACKING
169	cb += cMaxUsers * sizeof(PGMPOOLUSER);
170	#endif
171	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
172	cb += cMaxPhysExts * sizeof(PGMPOOLPHYSEXT);
173	#endif
174	PPGMPOOL pPool;
175	rc = MMR3HyperAllocOnceNoRel(pVM, cb, 0, MM_TAG_PGM_POOL, (void **)&pPool);
176	if (VBOX_FAILURE(rc))
177	return rc;
178	pVM->pgm.s.pPoolHC = pPool;
179	pVM->pgm.s.pPoolGC = MMHyperHC2GC(pVM, pPool);
180
181	/*
182	* Initialize it.
183	*/
184	pPool->pVMHC = pVM;
185	pPool->pVMGC = pVM->pVMGC;
186	pPool->cMaxPages = cMaxPages;
187	pPool->cCurPages = PGMPOOL_IDX_FIRST;
188	#ifdef PGMPOOL_WITH_USER_TRACKING
189	pPool->iUserFreeHead = 0;
190	pPool->cMaxUsers = cMaxUsers;
191	PPGMPOOLUSER paUsers = (PPGMPOOLUSER)&pPool->aPages[pPool->cMaxPages];
192	pPool->paUsersHC = paUsers;
193	pPool->paUsersGC = MMHyperHC2GC(pVM, paUsers);
194	for (unsigned i = 0; i < cMaxUsers; i++)
195	{
196	paUsers[i].iNext = i + 1;
197	paUsers[i].iUser = NIL_PGMPOOL_IDX;
198	paUsers[i].iUserTable = 0xfffe;
199	}
200	paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
201	#endif
202	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
203	pPool->iPhysExtFreeHead = 0;
204	pPool->cMaxPhysExts = cMaxPhysExts;
205	PPGMPOOLPHYSEXT paPhysExts = (PPGMPOOLPHYSEXT)&paUsers[cMaxUsers];
206	pPool->paPhysExtsHC = paPhysExts;
207	pPool->paPhysExtsGC = MMHyperHC2GC(pVM, paPhysExts);
208	for (unsigned i = 0; i < cMaxPhysExts; i++)
209	{
210	paPhysExts[i].iNext = i + 1;
211	paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
212	paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
213	paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
214	}
215	paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
216	#endif
217	#ifdef PGMPOOL_WITH_CACHE
218	for (unsigned i = 0; i < ELEMENTS(pPool->aiHash); i++)
219	pPool->aiHash[i] = NIL_PGMPOOL_IDX;
220	pPool->iAgeHead = NIL_PGMPOOL_IDX;
221	pPool->iAgeTail = NIL_PGMPOOL_IDX;
222	pPool->fCacheEnabled = fCacheEnabled;
223	#endif
224	#ifdef PGMPOOL_WITH_MONITORING
225	pPool->pfnAccessHandlerR3 = pgmR3PoolAccessHandler;
226	pPool->pszAccessHandler = "Guest Paging Access Handler";
227	#endif
228	pPool->HCPhysTree = 0;
229
230	/* The NIL entry. */
231	Assert(NIL_PGMPOOL_IDX == 0);
232	pPool->aPages[NIL_PGMPOOL_IDX].enmKind = PGMPOOLKIND_INVALID;
233
234	/* The Shadow 32-bit PD. */
235	pPool->aPages[PGMPOOL_IDX_PD].Core.Key = NIL_RTHCPHYS;
236	pPool->aPages[PGMPOOL_IDX_PD].GCPhys = NIL_RTGCPHYS;
237	pPool->aPages[PGMPOOL_IDX_PD].pvPageHC = pVM->pgm.s.pHC32BitPD;
238	pPool->aPages[PGMPOOL_IDX_PD].enmKind = PGMPOOLKIND_ROOT_32BIT_PD;
239	pPool->aPages[PGMPOOL_IDX_PD].idx = PGMPOOL_IDX_PD;
240
241	/* The Shadow PAE PDs. This is actually 4 pages! */
242	pPool->aPages[PGMPOOL_IDX_PAE_PD].Core.Key = NIL_RTHCPHYS;
243	pPool->aPages[PGMPOOL_IDX_PAE_PD].GCPhys = NIL_RTGCPHYS;
244	pPool->aPages[PGMPOOL_IDX_PAE_PD].pvPageHC = pVM->pgm.s.apHCPaePDs[0];
245	pPool->aPages[PGMPOOL_IDX_PAE_PD].enmKind = PGMPOOLKIND_ROOT_PAE_PD;
246	pPool->aPages[PGMPOOL_IDX_PAE_PD].idx = PGMPOOL_IDX_PAE_PD;
247
248	/* The Shadow PDPTR. */
249	pPool->aPages[PGMPOOL_IDX_PDPTR].Core.Key = NIL_RTHCPHYS;
250	pPool->aPages[PGMPOOL_IDX_PDPTR].GCPhys = NIL_RTGCPHYS;
251	pPool->aPages[PGMPOOL_IDX_PDPTR].pvPageHC = pVM->pgm.s.pHCPaePDPTR;
252	pPool->aPages[PGMPOOL_IDX_PDPTR].enmKind = PGMPOOLKIND_ROOT_PDPTR;
253	pPool->aPages[PGMPOOL_IDX_PDPTR].idx = PGMPOOL_IDX_PDPTR;
254
255	/* The Shadow Page Map Level-4. */
256	pPool->aPages[PGMPOOL_IDX_PML4].Core.Key = NIL_RTHCPHYS;
257	pPool->aPages[PGMPOOL_IDX_PML4].GCPhys = NIL_RTGCPHYS;
258	pPool->aPages[PGMPOOL_IDX_PML4].pvPageHC = pVM->pgm.s.pHCPaePML4;
259	pPool->aPages[PGMPOOL_IDX_PML4].enmKind = PGMPOOLKIND_ROOT_PML4;
260	pPool->aPages[PGMPOOL_IDX_PML4].idx = PGMPOOL_IDX_PML4;
261
262	/*
263	* Set common stuff.
264	*/
265	for (unsigned iPage = 1; iPage < PGMPOOL_IDX_FIRST; iPage++)
266	{
267	pPool->aPages[iPage].iNext = NIL_PGMPOOL_IDX;
268	#ifdef PGMPOOL_WITH_USER_TRACKING
269	pPool->aPages[iPage].iUserHead = NIL_PGMPOOL_USER_INDEX;
270	#endif
271	#ifdef PGMPOOL_WITH_MONITORING
272	pPool->aPages[iPage].iModifiedNext = NIL_PGMPOOL_IDX;
273	pPool->aPages[iPage].iModifiedPrev = NIL_PGMPOOL_IDX;
274	pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
275	pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
276	#endif
277	#ifdef PGMPOOL_WITH_CACHE
278	pPool->aPages[iPage].iAgeNext = NIL_PGMPOOL_IDX;
279	pPool->aPages[iPage].iAgePrev = NIL_PGMPOOL_IDX;
280	#endif
281	Assert(VALID_PTR(pPool->aPages[iPage].pvPageHC));
282	Assert(pPool->aPages[iPage].idx == iPage);
283	Assert(pPool->aPages[iPage].GCPhys == NIL_RTGCPHYS);
284	Assert(!pPool->aPages[iPage].fSeenNonGlobal);
285	Assert(!pPool->aPages[iPage].fMonitored);
286	Assert(!pPool->aPages[iPage].fCached);
287	Assert(!pPool->aPages[iPage].fZeroed);
288	Assert(!pPool->aPages[iPage].fReusedFlushPending);
289	}
290
291	#ifdef VBOX_WITH_STATISTICS
292	/*
293	* Register statistics.
294	*/
295	STAM_REG(pVM, &pPool->cCurPages, STAMTYPE_U16, "/PGM/Pool/cCurPages", STAMUNIT_PAGES, "Current pool size.");
296	STAM_REG(pVM, &pPool->cMaxPages, STAMTYPE_U16, "/PGM/Pool/cMaxPages", STAMUNIT_PAGES, "Max pool size.");
297	STAM_REG(pVM, &pPool->cUsedPages, STAMTYPE_U16, "/PGM/Pool/cUsedPages", STAMUNIT_PAGES, "The number of pages currently in use.");
298	STAM_REG(pVM, &pPool->cUsedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/cUsedPagesHigh", STAMUNIT_PAGES, "The high watermark for cUsedPages.");
299	STAM_REG(pVM, &pPool->StatAlloc, STAMTYPE_PROFILE_ADV, "/PGM/Pool/Alloc", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolAlloc.");
300	STAM_REG(pVM, &pPool->StatClearAll, STAMTYPE_PROFILE, "/PGM/Pool/ClearAll", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolClearAll.");
301	STAM_REG(pVM, &pPool->StatFlushAllInt, STAMTYPE_PROFILE, "/PGM/Pool/FlushAllInt", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushAllInt.");
302	STAM_REG(pVM, &pPool->StatFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/FlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushPage.");
303	STAM_REG(pVM, &pPool->StatFree, STAMTYPE_PROFILE, "/PGM/Pool/Free", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFree.");
304	STAM_REG(pVM, &pPool->StatZeroPage, STAMTYPE_PROFILE, "/PGM/Pool/ZeroPage", STAMUNIT_TICKS_PER_CALL, "Profiling time spend zeroing pages. Overlaps with Alloc.");
305	# ifdef PGMPOOL_WITH_USER_TRACKING
306	STAM_REG(pVM, &pPool->cMaxUsers, STAMTYPE_U16, "/PGM/Pool/Track/cMaxUsers", STAMUNIT_COUNT, "Max user tracking records.");
307	STAM_REG(pVM, &pPool->cPresent, STAMTYPE_U32, "/PGM/Pool/Track/cPresent", STAMUNIT_COUNT, "Number of present page table entries.");
308	STAM_REG(pVM, &pPool->StatTrackDeref, STAMTYPE_PROFILE, "/PGM/Pool/Track/Deref", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackDeref.");
309	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPT, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPT", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPT.");
310	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTs, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTs", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTs.");
311	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTsSlow, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTsSlow", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTsSlow.");
312	STAM_REG(pVM, &pPool->StatTrackFreeUpOneUser, STAMTYPE_COUNTER, "/PGM/Pool/Track/FreeUpOneUser", STAMUNIT_OCCURENCES, "The number of times we were out of user tracking records.");
313	# endif
314	# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
315	STAM_REG(pVM, &pPool->StatTrackDerefGCPhys, STAMTYPE_PROFILE, "/PGM/Pool/Track/DrefGCPhys", STAMUNIT_OCCURENCES, "Profiling deref activity related tracking GC physical pages.");
316	STAM_REG(pVM, &pPool->StatTrackLinearRamSearches, STAMTYPE_COUNTER, "/PGM/Pool/Track/LinearRamSearches", STAMUNIT_OCCURENCES, "The number of times we had to do linear ram searches.");
317	STAM_REG(pVM, &pPool->StamTrackPhysExtAllocFailures,STAMTYPE_COUNTER, "/PGM/Pool/Track/PhysExtAllocFailures", STAMUNIT_OCCURENCES, "The number of failing pgmPoolTrackPhysExtAlloc calls.");
318	# endif
319	# ifdef PGMPOOL_WITH_MONITORING
320	STAM_REG(pVM, &pPool->StatMonitorGC, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GC", STAMUNIT_TICKS_PER_CALL, "Profiling the GC PT access handler.");
321	STAM_REG(pVM, &pPool->StatMonitorGCEmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCEmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
322	STAM_REG(pVM, &pPool->StatMonitorGCFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GCFlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling the pgmPoolFlushPage calls made from the GC PT access handler.");
323	STAM_REG(pVM, &pPool->StatMonitorGCFork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCFork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
324	STAM_REG(pVM, &pPool->StatMonitorGCHandled, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GCHandled", STAMUNIT_TICKS_PER_CALL, "Profiling the GC access we've handled (except REP STOSD).");
325	STAM_REG(pVM, &pPool->StatMonitorGCIntrFailPatch1, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCIntrFailPatch1", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction.");
326	STAM_REG(pVM, &pPool->StatMonitorGCIntrFailPatch2, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCIntrFailPatch2", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction during flushing.");
327	STAM_REG(pVM, &pPool->StatMonitorGCRepPrefix, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCRepPrefix", STAMUNIT_OCCURENCES, "The number of times we've seen rep prefixes we can't handle.");
328	STAM_REG(pVM, &pPool->StatMonitorGCRepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GCRepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
329	STAM_REG(pVM, &pPool->StatMonitorHC, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HC", STAMUNIT_TICKS_PER_CALL, "Profiling the HC PT access handler.");
330	STAM_REG(pVM, &pPool->StatMonitorHCEmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCEmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
331	STAM_REG(pVM, &pPool->StatMonitorHCFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HCFlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling the pgmPoolFlushPage calls made from the HC PT access handler.");
332	STAM_REG(pVM, &pPool->StatMonitorHCFork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCFork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
333	STAM_REG(pVM, &pPool->StatMonitorHCHandled, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HCHandled", STAMUNIT_TICKS_PER_CALL, "Profiling the HC access we've handled (except REP STOSD).");
334	STAM_REG(pVM, &pPool->StatMonitorHCRepPrefix, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCRepPrefix", STAMUNIT_OCCURENCES, "The number of times we've seen rep prefixes we can't handle.");
335	STAM_REG(pVM, &pPool->StatMonitorHCRepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HCRepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
336	STAM_REG(pVM, &pPool->StatMonitorHCAsync, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCAsync", STAMUNIT_OCCURENCES, "Times we're called in an async thread and need to flush.");
337	STAM_REG(pVM, &pPool->cModifiedPages, STAMTYPE_U16, "/PGM/Pool/Monitor/cModifiedPages", STAMUNIT_PAGES, "The current cModifiedPages value.");
338	STAM_REG(pVM, &pPool->cModifiedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/Monitor/cModifiedPagesHigh", STAMUNIT_PAGES, "The high watermark for cModifiedPages.");
339	# endif
340	# ifdef PGMPOOL_WITH_CACHE
341	STAM_REG(pVM, &pPool->StatCacheHits, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Hits", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls satisfied by the cache.");
342	STAM_REG(pVM, &pPool->StatCacheMisses, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Misses", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls not statisfied by the cache.");
343	STAM_REG(pVM, &pPool->StatCacheKindMismatches, STAMTYPE_COUNTER, "/PGM/Pool/Cache/KindMismatches", STAMUNIT_OCCURENCES, "The number of shadow page kind mismatches. (Better be low, preferably 0!)");
344	STAM_REG(pVM, &pPool->StatCacheFreeUpOne, STAMTYPE_COUNTER, "/PGM/Pool/Cache/FreeUpOne", STAMUNIT_OCCURENCES, "The number of times the cache was asked to free up a page.");
345	STAM_REG(pVM, &pPool->StatCacheCacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Cacheable", STAMUNIT_OCCURENCES, "The number of cacheable allocations.");
346	STAM_REG(pVM, &pPool->StatCacheUncacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Uncacheable", STAMUNIT_OCCURENCES, "The number of uncacheable allocations.");
347	# endif
348	#endif /* VBOX_WITH_STATISTICS */
349
350	return VINF_SUCCESS;
351	}
352
353
354	/**
355	* Relocate the page pool data.
356	*
357	* @param pVM The VM handle.
358	*/
359	void pgmR3PoolRelocate(PVM pVM)
360	{
361	pVM->pgm.s.pPoolGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC);
362	pVM->pgm.s.pPoolHC->pVMGC = pVM->pVMGC;
363	#ifdef PGMPOOL_WITH_USER_TRACKING
364	pVM->pgm.s.pPoolHC->paUsersGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC->paUsersHC);
365	#endif
366	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
367	pVM->pgm.s.pPoolHC->paPhysExtsGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC->paPhysExtsHC);
368	#endif
369	#ifdef PGMPOOL_WITH_MONITORING
370	int rc = PDMR3GetSymbolGC(pVM, NULL, "pgmPoolAccessHandler", &pVM->pgm.s.pPoolHC->pfnAccessHandlerGC);
371	AssertReleaseRC(rc);
372	/* init order hack. */
373	if (!pVM->pgm.s.pPoolHC->pfnAccessHandlerR0)
374	{
375	rc = PDMR3GetSymbolR0(pVM, NULL, "pgmPoolAccessHandler", &pVM->pgm.s.pPoolHC->pfnAccessHandlerR0);
376	AssertReleaseRC(rc);
377	}
378	#endif
379	}
380
381
382	/**
383	* Reset notification.
384	*
385	* This will flush the pool.
386	* @param pVM The VM handle.
387	*/
388	void pgmR3PoolReset(PVM pVM)
389	{
390	pgmPoolFlushAll(pVM);
391	}
392
393
394	/**
395	* Grows the shadow page pool.
396	*
397	* I.e. adds more pages to it, assuming that hasn't reached cMaxPages yet.
398	*
399	* @returns VBox status code.
400	* @param pVM The VM handle.
401	*/
402	PDMR3DECL(int) PGMR3PoolGrow(PVM pVM)
403	{
404	PPGMPOOL pPool = pVM->pgm.s.pPoolHC;
405	AssertReturn(pPool->cCurPages < pPool->cMaxPages, VERR_INTERNAL_ERROR);
406
407	/*
408	* How much to grow it by?
409	*/
410	uint32_t cPages = pPool->cMaxPages - pPool->cCurPages;
411	cPages = RT_MIN(PGMPOOL_CFG_MAX_GROW, cPages);
412	LogFlow(("PGMR3PoolGrow: Growing the by %d (%#x) pages.\n", cPages, cPages));
413
414	for (unsigned i = pPool->cCurPages; cPages-- > 0; i++)
415	{
416	PPGMPOOLPAGE pPage = &pPool->aPages[i];
417
418	pPage->pvPageHC = MMR3PageAlloc(pVM);
419	if (!pPage->pvPageHC)
420	{
421	Log(("We're out of memory!! i=%d\n", i));
422	return i ? VINF_SUCCESS : VERR_NO_PAGE_MEMORY;
423	}
424	pPage->Core.Key = MMPage2Phys(pVM, pPage->pvPageHC);
425	pPage->GCPhys = NIL_RTGCPHYS;
426	pPage->enmKind = PGMPOOLKIND_FREE;
427	pPage->idx = pPage - &pPool->aPages[0];
428	pPage->iNext = pPool->iFreeHead;
429	#ifdef PGMPOOL_WITH_USER_TRACKING
430	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
431	#endif
432	#ifdef PGMPOOL_WITH_MONITORING
433	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
434	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
435	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
436	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
437	#endif
438	#ifdef PGMPOOL_WITH_CACHE
439	pPage->iAgeNext = NIL_PGMPOOL_IDX;
440	pPage->iAgePrev = NIL_PGMPOOL_IDX;
441	#endif
442	/* commit it */
443	bool fRc = RTAvloHCPhysInsert(&pPool->HCPhysTree, &pPage->Core); Assert(fRc); NOREF(fRc);
444	pPool->iFreeHead = i;
445	pPool->cCurPages = i + 1;
446	}
447
448	Assert(pPool->cCurPages <= pPool->cMaxPages);
449	return VINF_SUCCESS;
450	}
451
452
453	#ifdef PGMPOOL_WITH_MONITORING
454
455	/**
456	* Worker used by pgmR3PoolAccessHandler when it's invoked by an async thread.
457	*
458	* @param pPool The pool.
459	* @param pPage The page.
460	*/
461	static DECLCALLBACK(void) pgmR3PoolFlushReusedPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
462	{
463	/* for the present this should be safe enough I think... */
464	pgmLock(pPool->pVMHC);
465	if ( pPage->fReusedFlushPending
466	&& pPage->enmKind != PGMPOOLKIND_FREE)
467	pgmPoolFlushPage(pPool, pPage);
468	pgmUnlock(pPool->pVMHC);
469	}
470
471
472	/**
473	* \#PF Handler callback for PT write accesses.
474	*
475	* The handler can not raise any faults, it's mainly for monitoring write access
476	* to certain pages.
477	*
478	* @returns VINF_SUCCESS if the handler have carried out the operation.
479	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
480	* @param pVM VM Handle.
481	* @param GCPhys The physical address the guest is writing to.
482	* @param pvPhys The HC mapping of that address.
483	* @param pvBuf What the guest is reading/writing.
484	* @param cbBuf How much it's reading/writing.
485	* @param enmAccessType The access type.
486	* @param pvUser User argument.
487	*/
488	static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
489	{
490	STAM_PROFILE_START(&pVM->pgm.s.pPoolHC->StatMonitorHC, a);
491	PPGMPOOL pPool = pVM->pgm.s.pPoolHC;
492	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
493	LogFlow(("pgmR3PoolAccessHandler: GCPhys=%VGp %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
494	GCPhys, pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
495
496	/*
497	* We don't have to be very sophisiticated about this since there are relativly few calls here.
498	* However, we must try our best to detect any non-cpu accesses (disk / networking).
499	*
500	* Just to make life more interesting, we'll have to deal with the async threads too.
501	* We cannot flush a page if we're in an async thread because of REM notifications.
502	*/
503	if (!VM_IS_EMT(pVM))
504	{
505	Log(("pgmR3PoolAccessHandler: async thread, requesting EMT to flush the page: %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
506	pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
507	STAM_COUNTER_INC(&pPool->StatMonitorHCAsync);
508	if (!pPage->fReusedFlushPending)
509	{
510	int rc = VMR3ReqCallEx(pPool->pVMHC, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID, (PFNRT)pgmR3PoolFlushReusedPage, 2, pPool, pPage);
511	AssertRCReturn(rc, rc);
512	pPage->fReusedFlushPending = true;
513	pPage->cModifications += 0x1000;
514	}
515	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
516	/** @todo r=bird: making unsafe assumption about not crossing entries here! */
517	while (cbBuf > 4)
518	{
519	cbBuf -= 4;
520	pvPhys = (uint8_t *)pvPhys + 4;
521	GCPhys += 4;
522	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
523	}
524	STAM_PROFILE_STOP(&pPool->StatMonitorHC, a);
525	}
526	else if ( (pPage->fCR3Mix \|\| pPage->cModifications < 96) /* it's cheaper here. */
527	&& cbBuf <= 4)
528	{
529	/* Clear the shadow entry. */
530	if (!pPage->cModifications++)
531	pgmPoolMonitorModifiedInsert(pPool, pPage);
532	/** @todo r=bird: making unsafe assumption about not crossing entries here! */
533	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
534	STAM_PROFILE_STOP(&pPool->StatMonitorHC, a);
535	}
536	else
537	{
538	pgmPoolMonitorChainFlush(pPool, pPage); /* ASSUME that VERR_PGM_POOL_CLEARED can be ignored here and that FFs will deal with it in due time. */
539	STAM_PROFILE_STOP_EX(&pPool->StatMonitorHC, &pPool->StatMonitorHCFlushPage, a);
540	}
541
542	return VINF_PGM_HANDLER_DO_DEFAULT;
543	}
544
545	#endif /* PGMPOOL_WITH_MONITORING */
546

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source: vbox/trunk/src/VBox/VMM/PGMPool.cpp@ 5285

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