PGMPool.cpp@ 1

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1	/** @file
2	*
3	* PGM Shadow Page Pool.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung 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	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/** @page pg_pgm_pool PGM Shadow Page Pool
23	*
24	* Motivations:
25	* -# Relationship between shadow page tables and physical guest pages. This
26	* should allow us to skip most of the global flushes now following access
27	* handler changes. The main expense is flushing shadow pages.
28	* -# Limit the pool size (currently it's kind of limitless IIRC).
29	* -# Allocate shadow pages from GC. Currently we're allocating at SyncCR3 time.
30	* -# Required for 64-bit guests.
31	* -# Combining the PD cache and page pool in order to simplify caching.
32	*
33	*
34	* @section sec_pgm_pool_outline Design Outline
35	*
36	* The shadow page pool tracks pages used for shadowing paging structures (i.e. page
37	* tables, page directory, page directory pointer table and page map level-4). Each
38	* page in the pool has an unique identifier. This identifier is used to link a guest
39	* physical page to a shadow PT. The identifier is a non-zero value and has a
40	* relativly low max value - say 14 bits. This makes it possible to fit it into the
41	* upper bits of the of the aHCPhys entries in the ram range.
42	*
43	* By restricting host physical memory to the first 48 bits (which is the announced
44	* physical memory range of the K8L chip (scheduled for 2008)), we can safely use the
45	* upper 16 bits for shadow page ID and reference counting.
46	*
47	* Now, it's possible for a page to be aliased, i.e. mapped by more than one PT or
48	* PD. This is solved by creating a list of physical cross reference extents when
49	* ever this happens. Each node in the list (extent) is can contain 3 page pool
50	* indexes. The list it self is chained using indexes into the paPhysExt array.
51	*
52	*
53	* @section sec_pgm_pool_life Life Cycle of a Shadow Page
54	*
55	* -# The SyncPT function requests a page from the pool.
56	* The request includes the kind of page it is (PT/PD, PAE/legacy), the
57	* address of the page it's shadowing, and more.
58	* -# The pool responds to the request by allocating a new page.
59	* When the cache is enabled, it will first check if it's in the cache.
60	* Should the pool be exhausted, one of two things can be done:
61	* -# Flush the whole pool and current CR3.
62	* -# Use the cache to find a page which can be flushed (~age).
63	* -# The SyncPT function will sync one or more pages and insert it into the
64	* shadow PD.
65	* -# The SyncPage function may sync more pages on a later \#PFs.
66	* -# The page is freed / flushed in SyncCR3 (perhaps) and some other cases.
67	* When caching is enabled, the page isn't flush but remains in the cache.
68	*
69	*
70	* @section sec_pgm_pool_impl Monitoring
71	*
72	* We always monitor PAGE_SIZE chunks of memory. When we've got multiple shadow
73	* pages for the same PAGE_SIZE of guest memory (PAE and mixed PD/PT) the pages
74	* sharing the monitor get linked using the iMonitoredNext/Prev. The head page
75	* is the pvUser to the access handlers.
76	*
77	*
78	* @section sec_pgm_pool_impl Implementation
79	*
80	* The pool will take pages from the MM page pool. The tracking data (attributes,
81	* bitmaps and so on) are allocated from the hypervisor heap. The pool content can
82	* be accessed both by using the page id and the physical address (HC). The former
83	* is managed by means of an array, the latter by an offset based AVL tree.
84	*
85	* Flushing of a pool page means that we iterate the content (we know what kind
86	* it is) and updates the link information in the ram range.
87	*
88	* ...
89	*/
90
91
92	/*******************************************************************************
93	* Header Files *
94	*******************************************************************************/
95	#define LOG_GROUP LOG_GROUP_PGM_POOL
96	#include <VBox/pgm.h>
97	#include <VBox/mm.h>
98	#include "PGMInternal.h"
99	#include <VBox/vm.h>
100
101	#include <VBox/log.h>
102	#include <VBox/err.h>
103	#include <iprt/asm.h>
104	#include <iprt/string.h>
105
106
107	/*******************************************************************************
108	* Internal Functions *
109	*******************************************************************************/
110	#ifdef PGMPOOL_WITH_MONITORING
111	static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
112	#endif /* PGMPOOL_WITH_MONITORING */
113
114
115	/**
116	* Initalizes the pool
117	*
118	* @returns VBox status code.
119	* @param pVM The VM handle.
120	*/
121	int pgmR3PoolInit(PVM pVM)
122	{
123	/*
124	* Query Pool config.
125	*/
126	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "/PGM/Pool");
127	uint16_t cMaxPages;
128	int rc = CFGMR3QueryU16(pCfg, "MaxPages", &cMaxPages);
129	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
130	cMaxPages = 4*_1M >> PAGE_SHIFT;
131	else if (VBOX_FAILURE(rc))
132	AssertRCReturn(rc, rc);
133	else
134	AssertMsgReturn(cMaxPages <= PGMPOOL_IDX_LAST && cMaxPages >= RT_ALIGN(PGMPOOL_IDX_FIRST, 16),
135	("cMaxPages=%u (%#x)\n", cMaxPages, cMaxPages), VERR_INVALID_PARAMETER);
136	cMaxPages = RT_ALIGN(cMaxPages, 16);
137
138	uint16_t cMaxUsers;
139	rc = CFGMR3QueryU16(pCfg, "MaxUsers", &cMaxUsers);
140	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
141	cMaxUsers = cMaxPages * 2;
142	else if (VBOX_FAILURE(rc))
143	AssertRCReturn(rc, rc);
144	else
145	AssertMsgReturn(cMaxUsers >= cMaxPages && cMaxPages <= _32K,
146	("cMaxUsers=%u (%#x)\n", cMaxUsers, cMaxUsers), VERR_INVALID_PARAMETER);
147
148	uint16_t cMaxPhysExts;
149	rc = CFGMR3QueryU16(pCfg, "MaxPhysExts", &cMaxPhysExts);
150	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
151	cMaxPhysExts = RT_MAX(cMaxPages * 2, PGMPOOL_IDX_LAST);
152	else if (VBOX_FAILURE(rc))
153	AssertRCReturn(rc, rc);
154	else
155	AssertMsgReturn(cMaxPhysExts >= 16 && cMaxPages <= PGMPOOL_IDX_LAST,
156	("cMaxPhysExts=%u (%#x)\n", cMaxPhysExts, cMaxUsers), VERR_INVALID_PARAMETER);
157
158	bool fCacheEnabled;
159	rc = CFGMR3QueryBool(pCfg, "CacheEnabled", &fCacheEnabled);
160	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
161	fCacheEnabled = true;
162	else if (VBOX_FAILURE(rc))
163	AssertRCReturn(rc, rc);
164
165	Log(("pgmR3PoolInit: cMaxPages=%#RX16 cMaxUsers=%#RX16 cMaxPhysExts=%#RX16 fCacheEnable=%RTbool\n",
166	cMaxPages, cMaxUsers, cMaxPhysExts, fCacheEnabled));
167
168	/*
169	* Allocate the data structures.
170	*/
171	uint32_t cb = RT_OFFSETOF(PGMPOOL, aPages[cMaxPages]);
172	#ifdef PGMPOOL_WITH_USER_TRACKING
173	cb += cMaxUsers * sizeof(PGMPOOLUSER);
174	#endif
175	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
176	cb += cMaxPhysExts * sizeof(PGMPOOLPHYSEXT);
177	#endif
178	PPGMPOOL pPool;
179	rc = MMR3HyperAllocOnceNoRel(pVM, cb, 0, MM_TAG_PGM_POOL, (void **)&pPool);
180	if (VBOX_FAILURE(rc))
181	return rc;
182	pVM->pgm.s.pPoolHC = pPool;
183	pVM->pgm.s.pPoolGC = MMHyperHC2GC(pVM, pPool);
184
185	/*
186	* Initialize it.
187	*/
188	pPool->pVMHC = pVM;
189	pPool->pVMGC = pVM->pVMGC;
190	pPool->cMaxPages = cMaxPages;
191	pPool->cCurPages = PGMPOOL_IDX_FIRST;
192	#ifdef PGMPOOL_WITH_USER_TRACKING
193	pPool->iUserFreeHead = 0;
194	pPool->cMaxUsers = cMaxUsers;
195	PPGMPOOLUSER paUsers = (PPGMPOOLUSER)&pPool->aPages[pPool->cMaxPages];
196	pPool->paUsersHC = paUsers;
197	pPool->paUsersGC = MMHyperHC2GC(pVM, paUsers);
198	for (unsigned i = 0; i < cMaxUsers; i++)
199	{
200	paUsers[i].iNext = i + 1;
201	paUsers[i].iUser = NIL_PGMPOOL_IDX;
202	paUsers[i].iUserTable = 0xfffe;
203	}
204	paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
205	#endif
206	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
207	pPool->iPhysExtFreeHead = 0;
208	pPool->cMaxPhysExts = cMaxPhysExts;
209	PPGMPOOLPHYSEXT paPhysExts = (PPGMPOOLPHYSEXT)&paUsers[cMaxUsers];
210	pPool->paPhysExtsHC = paPhysExts;
211	pPool->paPhysExtsGC = MMHyperHC2GC(pVM, paPhysExts);
212	for (unsigned i = 0; i < cMaxPhysExts; i++)
213	{
214	paPhysExts[i].iNext = i + 1;
215	paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
216	paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
217	paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
218	}
219	paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
220	#endif
221	#ifdef PGMPOOL_WITH_CACHE
222	for (unsigned i = 0; i < ELEMENTS(pPool->aiHash); i++)
223	pPool->aiHash[i] = NIL_PGMPOOL_IDX;
224	pPool->iAgeHead = NIL_PGMPOOL_IDX;
225	pPool->iAgeTail = NIL_PGMPOOL_IDX;
226	pPool->fCacheEnabled = fCacheEnabled;
227	#endif
228	#ifdef PGMPOOL_WITH_MONITORING
229	pPool->pfnAccessHandlerR3 = pgmR3PoolAccessHandler;
230	pPool->pszAccessHandler = "Guest Paging Access Handler";
231	#endif
232	pPool->HCPhysTree = 0;
233
234	/* The NIL entry. */
235	Assert(NIL_PGMPOOL_IDX == 0);
236	pPool->aPages[NIL_PGMPOOL_IDX].enmKind = PGMPOOLKIND_INVALID;
237
238	/* The Shadow 32-bit PD. */
239	pPool->aPages[PGMPOOL_IDX_PD].Core.Key = NIL_RTHCPHYS;
240	pPool->aPages[PGMPOOL_IDX_PD].GCPhys = NIL_RTGCPHYS;
241	pPool->aPages[PGMPOOL_IDX_PD].pvPageHC = pVM->pgm.s.pHC32BitPD;
242	pPool->aPages[PGMPOOL_IDX_PD].enmKind = PGMPOOLKIND_ROOT_32BIT_PD;
243	pPool->aPages[PGMPOOL_IDX_PD].idx = PGMPOOL_IDX_PD;
244
245	/* The Shadow PAE PDs. This is actually 4 pages! */
246	pPool->aPages[PGMPOOL_IDX_PAE_PD].Core.Key = NIL_RTHCPHYS;
247	pPool->aPages[PGMPOOL_IDX_PAE_PD].GCPhys = NIL_RTGCPHYS;
248	pPool->aPages[PGMPOOL_IDX_PAE_PD].pvPageHC = pVM->pgm.s.apHCPaePDs[0];
249	pPool->aPages[PGMPOOL_IDX_PAE_PD].enmKind = PGMPOOLKIND_ROOT_PAE_PD;
250	pPool->aPages[PGMPOOL_IDX_PAE_PD].idx = PGMPOOL_IDX_PAE_PD;
251
252	/* The Shadow PDPTR. */
253	pPool->aPages[PGMPOOL_IDX_PDPTR].Core.Key = NIL_RTHCPHYS;
254	pPool->aPages[PGMPOOL_IDX_PDPTR].GCPhys = NIL_RTGCPHYS;
255	pPool->aPages[PGMPOOL_IDX_PDPTR].pvPageHC = pVM->pgm.s.pHCPaePDPTR;
256	pPool->aPages[PGMPOOL_IDX_PDPTR].enmKind = PGMPOOLKIND_ROOT_PDPTR;
257	pPool->aPages[PGMPOOL_IDX_PDPTR].idx = PGMPOOL_IDX_PDPTR;
258
259	/* The Shadow Page Map Level-4. */
260	pPool->aPages[PGMPOOL_IDX_PML4].Core.Key = NIL_RTHCPHYS;
261	pPool->aPages[PGMPOOL_IDX_PML4].GCPhys = NIL_RTGCPHYS;
262	pPool->aPages[PGMPOOL_IDX_PML4].pvPageHC = pVM->pgm.s.pHCPaePML4;
263	pPool->aPages[PGMPOOL_IDX_PML4].enmKind = PGMPOOLKIND_ROOT_PML4;
264	pPool->aPages[PGMPOOL_IDX_PML4].idx = PGMPOOL_IDX_PML4;
265
266	/*
267	* Set common stuff.
268	*/
269	for (unsigned iPage = 1; iPage < PGMPOOL_IDX_FIRST; iPage++)
270	{
271	pPool->aPages[iPage].iNext = NIL_PGMPOOL_IDX;
272	#ifdef PGMPOOL_WITH_USER_TRACKING
273	pPool->aPages[iPage].iUserHead = NIL_PGMPOOL_USER_INDEX;
274	#endif
275	#ifdef PGMPOOL_WITH_MONITORING
276	pPool->aPages[iPage].iModifiedNext = NIL_PGMPOOL_IDX;
277	pPool->aPages[iPage].iModifiedPrev = NIL_PGMPOOL_IDX;
278	pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
279	pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
280	#endif
281	#ifdef PGMPOOL_WITH_CACHE
282	pPool->aPages[iPage].iAgeNext = NIL_PGMPOOL_IDX;
283	pPool->aPages[iPage].iAgePrev = NIL_PGMPOOL_IDX;
284	#endif
285	Assert(VALID_PTR(pPool->aPages[iPage].pvPageHC));
286	Assert(pPool->aPages[iPage].idx == iPage);
287	Assert(pPool->aPages[iPage].GCPhys == NIL_RTGCPHYS);
288	Assert(!pPool->aPages[iPage].fSeenNonGlobal);
289	Assert(!pPool->aPages[iPage].fMonitored);
290	Assert(!pPool->aPages[iPage].fCached);
291	Assert(!pPool->aPages[iPage].fZeroed);
292	Assert(!pPool->aPages[iPage].fReusedFlushPending);
293	}
294
295	#ifdef VBOX_WITH_STATISTICS
296	/*
297	* Register statistics.
298	*/
299	STAM_REG(pVM, &pPool->cCurPages, STAMTYPE_U16, "/PGM/Pool/cCurPages", STAMUNIT_PAGES, "Current pool size.");
300	STAM_REG(pVM, &pPool->cMaxPages, STAMTYPE_U16, "/PGM/Pool/cMaxPages", STAMUNIT_PAGES, "Max pool size.");
301	STAM_REG(pVM, &pPool->cUsedPages, STAMTYPE_U16, "/PGM/Pool/cUsedPages", STAMUNIT_PAGES, "The number of pages currently in use.");
302	STAM_REG(pVM, &pPool->cUsedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/cUsedPagesHigh", STAMUNIT_PAGES, "The high watermark for cUsedPages.");
303	STAM_REG(pVM, &pPool->StatAlloc, STAMTYPE_PROFILE_ADV, "/PGM/Pool/Alloc", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolAlloc.");
304	STAM_REG(pVM, &pPool->StatClearAll, STAMTYPE_PROFILE, "/PGM/Pool/ClearAll", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolClearAll.");
305	STAM_REG(pVM, &pPool->StatFlushAllInt, STAMTYPE_PROFILE, "/PGM/Pool/FlushAllInt", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushAllInt.");
306	STAM_REG(pVM, &pPool->StatFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/FlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushPage.");
307	STAM_REG(pVM, &pPool->StatFree, STAMTYPE_PROFILE, "/PGM/Pool/Free", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFree.");
308	STAM_REG(pVM, &pPool->StatZeroPage, STAMTYPE_PROFILE, "/PGM/Pool/ZeroPage", STAMUNIT_TICKS_PER_CALL, "Profiling time spend zeroing pages. Overlaps with Alloc.");
309	# ifdef PGMPOOL_WITH_USER_TRACKING
310	STAM_REG(pVM, &pPool->cMaxUsers, STAMTYPE_U16, "/PGM/Pool/Track/cMaxUsers", STAMUNIT_COUNT, "Max user tracking records.");
311	STAM_REG(pVM, &pPool->cPresent, STAMTYPE_U32, "/PGM/Pool/Track/cPresent", STAMUNIT_COUNT, "Number of present page table entries.");
312	STAM_REG(pVM, &pPool->StatTrackDeref, STAMTYPE_PROFILE, "/PGM/Pool/Track/Deref", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackDeref.");
313	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPT, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPT", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPT.");
314	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTs, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTs", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTs.");
315	STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTsSlow, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTsSlow", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTsSlow.");
316	STAM_REG(pVM, &pPool->StatTrackFreeUpOneUser, STAMTYPE_COUNTER, "/PGM/Pool/Track/FreeUpOneUser", STAMUNIT_OCCURENCES, "The number of times we were out of user tracking records.");
317	# endif
318	# ifdef PGMPOOL_WITH_GCPHYS_TRACKING
319	STAM_REG(pVM, &pPool->StatTrackDerefGCPhys, STAMTYPE_PROFILE, "/PGM/Pool/Track/DrefGCPhys", STAMUNIT_OCCURENCES, "Profiling deref activity related tracking GC physical pages.");
320	STAM_REG(pVM, &pPool->StatTrackLinearRamSearches, STAMTYPE_COUNTER, "/PGM/Pool/Track/LinearRamSearches", STAMUNIT_OCCURENCES, "The number of times we had to do linear ram searches.");
321	STAM_REG(pVM, &pPool->StamTrackPhysExtAllocFailures,STAMTYPE_COUNTER, "/PGM/Pool/Track/PhysExtAllocFailures", STAMUNIT_OCCURENCES, "The number of failing pgmPoolTrackPhysExtAlloc calls.");
322	# endif
323	# ifdef PGMPOOL_WITH_MONITORING
324	STAM_REG(pVM, &pPool->StatMonitorGC, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GC", STAMUNIT_TICKS_PER_CALL, "Profiling the GC PT access handler.");
325	STAM_REG(pVM, &pPool->StatMonitorGCEmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCEmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
326	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.");
327	STAM_REG(pVM, &pPool->StatMonitorGCFork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCFork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
328	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).");
329	STAM_REG(pVM, &pPool->StatMonitorGCIntrFailPatch1, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCIntrFailPatch1", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction.");
330	STAM_REG(pVM, &pPool->StatMonitorGCIntrFailPatch2, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/GCIntrFailPatch2", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction during flushing.");
331	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.");
332	STAM_REG(pVM, &pPool->StatMonitorGCRepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/GCRepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
333	STAM_REG(pVM, &pPool->StatMonitorHC, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HC", STAMUNIT_TICKS_PER_CALL, "Profiling the HC PT access handler.");
334	STAM_REG(pVM, &pPool->StatMonitorHCEmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCEmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
335	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.");
336	STAM_REG(pVM, &pPool->StatMonitorHCFork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/HCFork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
337	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).");
338	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.");
339	STAM_REG(pVM, &pPool->StatMonitorHCRepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/HCRepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
340	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.");
341	STAM_REG(pVM, &pPool->cModifiedPages, STAMTYPE_U16, "/PGM/Pool/Monitor/cModifiedPages", STAMUNIT_PAGES, "The current cModifiedPages value.");
342	STAM_REG(pVM, &pPool->cModifiedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/Monitor/cModifiedPagesHigh", STAMUNIT_PAGES, "The high watermark for cModifiedPages.");
343	# endif
344	# ifdef PGMPOOL_WITH_CACHE
345	STAM_REG(pVM, &pPool->StatCacheHits, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Hits", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls satisfied by the cache.");
346	STAM_REG(pVM, &pPool->StatCacheMisses, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Misses", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls not statisfied by the cache.");
347	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!)");
348	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.");
349	STAM_REG(pVM, &pPool->StatCacheCacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Cacheable", STAMUNIT_OCCURENCES, "The number of cacheable allocations.");
350	STAM_REG(pVM, &pPool->StatCacheUncacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Uncacheable", STAMUNIT_OCCURENCES, "The number of uncacheable allocations.");
351	# endif
352	#endif /* VBOX_WITH_STATISTICS */
353
354	return VINF_SUCCESS;
355	}
356
357
358	/**
359	* Relocate the page pool data.
360	*
361	* @param pVM The VM handle.
362	*/
363	void pgmR3PoolRelocate(PVM pVM)
364	{
365	pVM->pgm.s.pPoolGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC);
366	pVM->pgm.s.pPoolHC->pVMGC = pVM->pVMGC;
367	#ifdef PGMPOOL_WITH_USER_TRACKING
368	pVM->pgm.s.pPoolHC->paUsersGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC->paUsersHC);
369	#endif
370	#ifdef PGMPOOL_WITH_GCPHYS_TRACKING
371	pVM->pgm.s.pPoolHC->paPhysExtsGC = MMHyperHC2GC(pVM, pVM->pgm.s.pPoolHC->paPhysExtsHC);
372	#endif
373	#ifdef PGMPOOL_WITH_MONITORING
374	int rc = PDMR3GetSymbolGC(pVM, NULL, "pgmPoolAccessHandler", &pVM->pgm.s.pPoolHC->pfnAccessHandlerGC);
375	AssertReleaseRC(rc);
376	/* init order hack. */
377	if (!pVM->pgm.s.pPoolHC->pfnAccessHandlerR0)
378	{
379	rc = PDMR3GetSymbolR0(pVM, NULL, "pgmPoolAccessHandler", (void **)&pVM->pgm.s.pPoolHC->pfnAccessHandlerR0);
380	AssertReleaseRC(rc);
381	}
382	#endif
383	}
384
385
386	/**
387	* Reset notification.
388	*
389	* This will flush the pool.
390	* @param pVM The VM handle.
391	*/
392	void pgmR3PoolReset(PVM pVM)
393	{
394	pgmPoolFlushAll(pVM);
395	}
396
397
398	/**
399	* Grows the shadow page pool.
400	*
401	* I.e. adds more pages to it, assuming that hasn't reached cMaxPages yet.
402	*
403	* @returns VBox status code.
404	* @param pVM The VM handle.
405	*/
406	PDMR3DECL(int) PGMR3PoolGrow(PVM pVM)
407	{
408	PPGMPOOL pPool = pVM->pgm.s.pPoolHC;
409	AssertReturn(pPool->cCurPages < pPool->cMaxPages, VERR_INTERNAL_ERROR);
410
411	/*
412	* How much to grow it by?
413	*/
414	uint32_t cPages = pPool->cMaxPages - pPool->cCurPages;
415	cPages = RT_MIN(PGMPOOL_CFG_MAX_GROW, cPages);
416	LogFlow(("PGMR3PoolGrow: Growing the by %d (%#x) pages.\n", cPages, cPages));
417
418	for (unsigned i = pPool->cCurPages; cPages-- > 0; i++)
419	{
420	PPGMPOOLPAGE pPage = &pPool->aPages[i];
421
422	pPage->pvPageHC = MMR3PageAlloc(pVM);
423	if (!pPage->pvPageHC)
424	{
425	Log(("We're out of memory!! i=%d\n", i));
426	return i ? VINF_SUCCESS : VERR_NO_PAGE_MEMORY;
427	}
428	pPage->Core.Key = MMPage2Phys(pVM, pPage->pvPageHC);
429	pPage->GCPhys = NIL_RTGCPHYS;
430	pPage->enmKind = PGMPOOLKIND_FREE;
431	pPage->idx = pPage - &pPool->aPages[0];
432	pPage->iNext = pPool->iFreeHead;
433	#ifdef PGMPOOL_WITH_USER_TRACKING
434	pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
435	#endif
436	#ifdef PGMPOOL_WITH_MONITORING
437	pPage->iModifiedNext = NIL_PGMPOOL_IDX;
438	pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
439	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
440	pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
441	#endif
442	#ifdef PGMPOOL_WITH_CACHE
443	pPage->iAgeNext = NIL_PGMPOOL_IDX;
444	pPage->iAgePrev = NIL_PGMPOOL_IDX;
445	#endif
446	/* commit it */
447	bool fRc = RTAvloHCPhysInsert(&pPool->HCPhysTree, &pPage->Core); Assert(fRc); NOREF(fRc);
448	pPool->iFreeHead = i;
449	pPool->cCurPages = i + 1;
450	}
451
452	Assert(pPool->cCurPages <= pPool->cMaxPages);
453	return VINF_SUCCESS;
454	}
455
456
457	#ifdef PGMPOOL_WITH_MONITORING
458
459	/**
460	* Worker used by pgmR3PoolAccessHandler when it's invoked by an async thread.
461	*
462	* @param pPool The pool.
463	* @param pPage The page.
464	*/
465	static DECLCALLBACK(void) pgmR3PoolFlushReusedPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
466	{
467	/* for the present this should be safe enough I think... */
468	pgmLock(pPool->pVMHC);
469	if ( pPage->fReusedFlushPending
470	&& pPage->enmKind != PGMPOOLKIND_FREE)
471	pgmPoolFlushPage(pPool, pPage);
472	pgmUnlock(pPool->pVMHC);
473	}
474
475
476	/**
477	* \#PF Handler callback for PT write accesses.
478	*
479	* The handler can not raise any faults, it's mainly for monitoring write access
480	* to certain pages.
481	*
482	* @returns VINF_SUCCESS if the handler have carried out the operation.
483	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
484	* @param pVM VM Handle.
485	* @param GCPhys The physical address the guest is writing to.
486	* @param pvPhys The HC mapping of that address.
487	* @param pvBuf What the guest is reading/writing.
488	* @param cbBuf How much it's reading/writing.
489	* @param enmAccessType The access type.
490	* @param pvUser User argument.
491	*/
492	static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
493	{
494	STAM_PROFILE_START(&pVM->pgm.s.pPoolHC->StatMonitorHC, a);
495	PPGMPOOL pPool = pVM->pgm.s.pPoolHC;
496	PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
497	LogFlow(("pgmR3PoolAccessHandler: GCPhys=%VGp %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
498	GCPhys, pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
499
500	/*
501	* We don't have to be very sophisiticated about this since there are relativly few calls here.
502	* However, we must try our best to detect any non-cpu accesses (disk / networking).
503	*
504	* Just to make life more interesting, we'll have to deal with the async threads too.
505	* We cannot flush a page if we're in an async thread because of REM notifications.
506	*/
507	if (!VM_IS_EMT(pVM))
508	{
509	Log(("pgmR3PoolAccessHandler: async thread, requesting EMT to flush the page: %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
510	pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
511	STAM_COUNTER_INC(&pPool->StatMonitorHCAsync);
512	if (!pPage->fReusedFlushPending)
513	{
514	int rc = VMR3ReqCallEx(pPool->pVMHC, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID, (PFNRT)pgmR3PoolFlushReusedPage, 2, pPool, pPage);
515	AssertRCReturn(rc, rc);
516	pPage->fReusedFlushPending = true;
517	pPage->cModifications += 0x1000;
518	}
519	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
520	/** @todo r=bird: making unsafe assumption about not crossing entries here! */
521	while (cbBuf > 4)
522	{
523	cbBuf -= 4;
524	pvPhys = (uint8_t *)pvPhys + 4;
525	GCPhys += 4;
526	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
527	}
528	STAM_PROFILE_STOP(&pPool->StatMonitorHC, a);
529	}
530	else if ( (pPage->fCR3Mix \|\| pPage->cModifications < 96) /* it's cheaper here. */
531	&& cbBuf <= 4)
532	{
533	/* Clear the shadow entry. */
534	if (!pPage->cModifications++)
535	pgmPoolMonitorModifiedInsert(pPool, pPage);
536	/** @todo r=bird: making unsafe assumption about not crossing entries here! */
537	pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
538	STAM_PROFILE_STOP(&pPool->StatMonitorHC, a);
539	}
540	else
541	{
542	pgmPoolMonitorChainFlush(pPool, pPage); /* ASSUME that VERR_PGM_POOL_CLEARED can be ignored here and that FFs will deal with it in due time. */
543	STAM_PROFILE_STOP_EX(&pPool->StatMonitorHC, &pPool->StatMonitorHCFlushPage, a);
544	}
545
546	return VINF_PGM_HANDLER_DO_DEFAULT;
547	}
548
549	#endif /* PGMPOOL_WITH_MONITORING */
550

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source: vbox/trunk/src/VBox/VMM/PGMPool.cpp@ 1

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