PGMSharedPage.cpp@ 31529

Last change on this file since 31529 was 31529, checked in by vboxsync, 14 years ago
pSharedModules -> g_apSharedModules. (r64559 looked like RT_ELEMENTS was applied to a pointer.)
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 14.0 KB

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1	/* $Id: PGMSharedPage.cpp 31529 2010-08-10 12:13:57Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor, Shared page handling
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 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	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_PGM_SHARED
23	#include <VBox/pgm.h>
24	#include <VBox/stam.h>
25	#include "PGMInternal.h"
26	#include <VBox/vm.h>
27	#include <VBox/sup.h>
28	#include <VBox/param.h>
29	#include <VBox/err.h>
30	#include <VBox/log.h>
31	#include <iprt/asm.h>
32	#include <iprt/assert.h>
33	#include <iprt/mem.h>
34	#include <iprt/string.h>
35
36	#include "PGMInline.h"
37
38	/*******************************************************************************
39	* Global Variables *
40	*******************************************************************************/
41	#if defined(VBOX_STRICT) && HC_ARCH_BITS == 64
42	/** Keep a copy of all registered shared modules for the .pgmcheckduppages debugger command. */
43	static PGMMREGISTERSHAREDMODULEREQ g_apSharedModules[512] = {0};
44	static unsigned g_cSharedModules = 0;
45	#endif
46
47	/**
48	* Registers a new shared module for the VM
49	*
50	* @returns VBox status code.
51	* @param pVM VM handle
52	* @param enmGuestOS Guest OS type
53	* @param pszModuleName Module name
54	* @param pszVersion Module version
55	* @param GCBaseAddr Module base address
56	* @param cbModule Module size
57	* @param cRegions Number of shared region descriptors
58	* @param pRegions Shared region(s)
59	*/
60	VMMR3DECL(int) PGMR3SharedModuleRegister(PVM pVM, VBOXOSFAMILY enmGuestOS, char pszModuleName, char pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule,
61	unsigned cRegions, VMMDEVSHAREDREGIONDESC *pRegions)
62	{
63	#ifdef VBOX_WITH_PAGE_SHARING
64	PGMMREGISTERSHAREDMODULEREQ pReq;
65
66	Log(("PGMR3SharedModuleRegister family=%d name=%s version=%s base=%RGv size=%x cRegions=%d\n", enmGuestOS, pszModuleName, pszVersion, GCBaseAddr, cbModule, cRegions));
67
68	/* Sanity check. */
69	AssertReturn(cRegions < VMMDEVSHAREDREGIONDESC_MAX, VERR_INVALID_PARAMETER);
70
71	pReq = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
72	AssertReturn(pReq, VERR_NO_MEMORY);
73
74	pReq->enmGuestOS = enmGuestOS;
75	pReq->GCBaseAddr = GCBaseAddr;
76	pReq->cbModule = cbModule;
77	pReq->cRegions = cRegions;
78	for (unsigned i = 0; i < cRegions; i++)
79	pReq->aRegions[i] = pRegions[i];
80
81	if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
82	\|\| RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
83	{
84	RTMemFree(pReq);
85	return VERR_BUFFER_OVERFLOW;
86	}
87
88	int rc = GMMR3RegisterSharedModule(pVM, pReq);
89	# if defined(VBOX_STRICT) && HC_ARCH_BITS == 64
90	if (rc == VINF_SUCCESS)
91	{
92	PGMMREGISTERSHAREDMODULEREQ *ppSharedModule = NULL;
93
94	if (g_cSharedModules < RT_ELEMENTS(g_apSharedModules))
95	{
96	for (unsigned i = 0; i < RT_ELEMENTS(g_apSharedModules); i++)
97	{
98	if (g_apSharedModules[i] == NULL)
99	{
100	ppSharedModule = &g_apSharedModules[i];
101	break;
102	}
103	}
104	Assert(ppSharedModule);
105
106	if (ppSharedModule)
107	{
108	*ppSharedModule = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
109	memcpy(*ppSharedModule, pReq, RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
110	g_cSharedModules++;
111	}
112	}
113	}
114	# endif
115
116	RTMemFree(pReq);
117	Assert(rc == VINF_SUCCESS \|\| rc == VINF_PGM_SHARED_MODULE_COLLISION \|\| rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED);
118	if (RT_FAILURE(rc))
119	return rc;
120
121	return VINF_SUCCESS;
122	#else
123	return VERR_NOT_IMPLEMENTED;
124	#endif
125	}
126
127	/**
128	* Unregisters a shared module for the VM
129	*
130	* @returns VBox status code.
131	* @param pVM VM handle
132	* @param pszModuleName Module name
133	* @param pszVersion Module version
134	* @param GCBaseAddr Module base address
135	* @param cbModule Module size
136	*/
137	VMMR3DECL(int) PGMR3SharedModuleUnregister(PVM pVM, char pszModuleName, char pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule)
138	{
139	#ifdef VBOX_WITH_PAGE_SHARING
140	PGMMUNREGISTERSHAREDMODULEREQ pReq;
141
142	Log(("PGMR3SharedModuleUnregister name=%s version=%s base=%RGv size=%x\n", pszModuleName, pszVersion, GCBaseAddr, cbModule));
143
144	pReq = (PGMMUNREGISTERSHAREDMODULEREQ)RTMemAllocZ(sizeof(*pReq));
145	AssertReturn(pReq, VERR_NO_MEMORY);
146
147	pReq->GCBaseAddr = GCBaseAddr;
148	pReq->cbModule = cbModule;
149
150	if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
151	\|\| RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
152	{
153	RTMemFree(pReq);
154	return VERR_BUFFER_OVERFLOW;
155	}
156	int rc = GMMR3UnregisterSharedModule(pVM, pReq);
157	RTMemFree(pReq);
158
159	# if defined(VBOX_STRICT) && HC_ARCH_BITS == 64
160	for (unsigned i = 0; i < g_cSharedModules; i++)
161	{
162	if ( g_apSharedModules[i]
163	&& !strcmp(g_apSharedModules[i]->szName, pszModuleName)
164	&& !strcmp(g_apSharedModules[i]->szVersion, pszVersion))
165	{
166	RTMemFree(g_apSharedModules[i]);
167	g_apSharedModules[i] = NULL;
168	g_cSharedModules--;
169	break;
170	}
171	}
172	# endif
173	return rc;
174	#else
175	return VERR_NOT_IMPLEMENTED;
176	#endif
177	}
178
179	#ifdef VBOX_WITH_PAGE_SHARING
180	/**
181	* Rendezvous callback that will be called once.
182	*
183	* @returns VBox strict status code.
184	* @param pVM VM handle.
185	* @param pVCpu The VMCPU handle for the calling EMT.
186	* @param pvUser Not used;
187	*/
188	static DECLCALLBACK(VBOXSTRICTRC) pgmR3SharedModuleRegRendezvous(PVM pVM, PVMCPU pVCpu, void *pvUser)
189	{
190	VMCPUID idCpu = (VMCPUID )pvUser;
191
192	/* Execute on the VCPU that issued the original request to make sure we're in the right cr3 context. */
193	if (pVCpu->idCpu != idCpu)
194	{
195	Assert(pVM->cCpus > 1);
196	return VINF_SUCCESS;
197	}
198
199	/* Flush all pending handy page operations before changing any shared page assignments. */
200	int rc = PGMR3PhysAllocateHandyPages(pVM);
201	AssertRC(rc);
202
203	/* Lock it here as we can't deal with busy locks in this ring-0 path. */
204	pgmLock(pVM);
205	rc = GMMR3CheckSharedModules(pVM);
206	pgmUnlock(pVM);
207	AssertLogRelRC(rc);
208	return rc;
209	}
210
211	/**
212	* Shared module check helper (called on the way out).
213	*
214	* @param pVM The VM handle.
215	* @param VMCPUID VCPU id
216	*/
217	static DECLCALLBACK(void) pgmR3CheckSharedModulesHelper(PVM pVM, VMCPUID idCpu)
218	{
219	/* We must stall other VCPUs as we'd otherwise have to send IPI flush commands for every single change we make. */
220	int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONE_BY_ONE, pgmR3SharedModuleRegRendezvous, &idCpu);
221	Assert(rc == VINF_SUCCESS);
222	}
223	#endif
224
225	/**
226	* Check all registered modules for changes.
227	*
228	* @returns VBox status code.
229	* @param pVM VM handle
230	*/
231	VMMR3DECL(int) PGMR3SharedModuleCheckAll(PVM pVM)
232	{
233	#ifdef VBOX_WITH_PAGE_SHARING
234	/* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
235	return VMR3ReqCallNoWait(pVM, VMCPUID_ANY_QUEUE, (PFNRT)pgmR3CheckSharedModulesHelper, 2, pVM, VMMGetCpuId(pVM));
236	#else
237	return VERR_NOT_IMPLEMENTED;
238	#endif
239	}
240
241	/**
242	* Query the state of a page in a shared module
243	*
244	* @returns VBox status code.
245	* @param pVM VM handle
246	* @param GCPtrPage Page address
247	* @param pfShared Shared status (out)
248	* @param puPageFlags Page flags (out)
249	*/
250	VMMR3DECL(int) PGMR3SharedModuleGetPageState(PVM pVM, RTGCPTR GCPtrPage, bool pfShared, uint64_t puPageFlags)
251	{
252	#if defined(VBOX_WITH_PAGE_SHARING) && defined(DEBUG)
253	/* Debug only API for the page fusion testcase. */
254	RTGCPHYS GCPhys;
255	uint64_t fFlags;
256
257	pgmLock(pVM);
258
259	int rc = PGMGstGetPage(VMMGetCpu(pVM), GCPtrPage, &fFlags, &GCPhys);
260	switch (rc)
261	{
262	case VINF_SUCCESS:
263	{
264	PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
265	if (pPage)
266	{
267	*pfShared = PGM_PAGE_IS_SHARED(pPage);
268	*puPageFlags = fFlags;
269	}
270	else
271	rc = VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
272	break;
273	}
274	case VERR_PAGE_NOT_PRESENT:
275	case VERR_PAGE_TABLE_NOT_PRESENT:
276	case VERR_PAGE_MAP_LEVEL4_NOT_PRESENT:
277	case VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT:
278	*pfShared = false;
279	*puPageFlags = 0;
280	rc = VINF_SUCCESS;
281	break;
282
283	default:
284	break;
285	}
286
287	pgmUnlock(pVM);
288	return rc;
289	#else
290	return VERR_NOT_IMPLEMENTED;
291	#endif
292	}
293
294
295	#if defined(VBOX_STRICT) && HC_ARCH_BITS == 64
296	/**
297	* The '.pgmcheckduppages' command.
298	*
299	* @returns VBox status.
300	* @param pCmd Pointer to the command descriptor (as registered).
301	* @param pCmdHlp Pointer to command helper functions.
302	* @param pVM Pointer to the current VM (if any).
303	* @param paArgs Pointer to (readonly) array of arguments.
304	* @param cArgs Number of arguments in the array.
305	*/
306	DECLCALLBACK(int) pgmR3CmdCheckDuplicatePages(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
307	{
308	unsigned cBallooned = 0;
309	unsigned cShared = 0;
310	unsigned cZero = 0;
311	unsigned cUnique = 0;
312	unsigned cDuplicate = 0;
313	unsigned cAllocZero = 0;
314	unsigned cPages = 0;
315
316	pgmLock(pVM);
317
318	for (PPGMRAMRANGE pRam = pVM->pgm.s.pRamRangesR3; pRam; pRam = pRam->pNextR3)
319	{
320	PPGMPAGE pPage = &pRam->aPages[0];
321	RTGCPHYS GCPhys = pRam->GCPhys;
322	uint32_t cLeft = pRam->cb >> PAGE_SHIFT;
323	while (cLeft-- > 0)
324	{
325	if (PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM)
326	{
327	switch (PGM_PAGE_GET_STATE(pPage))
328	{
329	case PGM_PAGE_STATE_ZERO:
330	cZero++;
331	break;
332
333	case PGM_PAGE_STATE_BALLOONED:
334	cBallooned++;
335	break;
336
337	case PGM_PAGE_STATE_SHARED:
338	cShared++;
339	break;
340
341	case PGM_PAGE_STATE_ALLOCATED:
342	case PGM_PAGE_STATE_WRITE_MONITORED:
343	{
344	const void *pvPage;
345	/* Check if the page was allocated, but completely zero. */
346	int rc = pgmPhysGCPhys2CCPtrInternalReadOnly(pVM, pPage, GCPhys, &pvPage);
347	if ( rc == VINF_SUCCESS
348	&& ASMMemIsZeroPage(pvPage))
349	{
350	cAllocZero++;
351	}
352	else
353	if (GMMR3IsDuplicatePage(pVM, PGM_PAGE_GET_PAGEID(pPage)))
354	cDuplicate++;
355	else
356	cUnique++;
357
358	break;
359	}
360
361	default:
362	AssertFailed();
363	break;
364	}
365	}
366
367	/* next */
368	pPage++;
369	GCPhys += PAGE_SIZE;
370	cPages++;
371	/* Give some feedback for every processed megabyte. */
372	if ((cPages & 0x7f) == 0)
373	pCmdHlp->pfnPrintf(pCmdHlp, NULL, ".");
374	}
375	}
376	pgmUnlock(pVM);
377
378	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "\nNumber of zero pages %08x (%d MB)\n", cZero, cZero / 256);
379	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of alloczero pages %08x (%d MB)\n", cAllocZero, cAllocZero / 256);
380	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of ballooned pages %08x (%d MB)\n", cBallooned, cBallooned / 256);
381	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of shared pages %08x (%d MB)\n", cShared, cShared / 256);
382	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of unique pages %08x (%d MB)\n", cUnique, cUnique / 256);
383	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of duplicate pages %08x (%d MB)\n", cDuplicate, cDuplicate / 256);
384	return VINF_SUCCESS;
385	}
386
387	/**
388	* The '.pgmsharedmodules' command.
389	*
390	* @returns VBox status.
391	* @param pCmd Pointer to the command descriptor (as registered).
392	* @param pCmdHlp Pointer to command helper functions.
393	* @param pVM Pointer to the current VM (if any).
394	* @param paArgs Pointer to (readonly) array of arguments.
395	* @param cArgs Number of arguments in the array.
396	*/
397	DECLCALLBACK(int) pgmR3CmdShowSharedModules(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
398	{
399	unsigned i = 0;
400
401	pgmLock(pVM);
402	do
403	{
404	if (g_apSharedModules[i])
405	{
406	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Shared module %s (%s):\n", g_apSharedModules[i]->szName, g_apSharedModules[i]->szVersion);
407	for (unsigned j = 0; j < g_apSharedModules[i]->cRegions; j++)
408	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "--- Region %d: base %RGv size %x\n", j, g_apSharedModules[i]->aRegions[j].GCRegionAddr, g_apSharedModules[i]->aRegions[j].cbRegion);
409	}
410	i++;
411	}
412	while (i < RT_ELEMENTS(g_apSharedModules));
413	pgmUnlock(pVM);
414
415	return VINF_SUCCESS;
416	}
417
418	#endif /* VBOX_STRICT && HC_ARCH_BITS == 64*/

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source: vbox/trunk/src/VBox/VMM/PGMSharedPage.cpp@ 31529

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