PGMSharedPage.cpp@ 48565

Last change on this file since 48565 was 44528, checked in by vboxsync, 12 years ago
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1	/* $Id: PGMSharedPage.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */
2	/** @file
3	* PGM - Page Manager and Monitor, Shared page handling
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 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/vmm/pgm.h>
24	#include <VBox/vmm/stam.h>
25	#include <VBox/vmm/uvm.h>
26	#include "PGMInternal.h"
27	#include <VBox/vmm/vm.h>
28	#include <VBox/sup.h>
29	#include <VBox/param.h>
30	#include <VBox/err.h>
31	#include <VBox/log.h>
32	#include <iprt/asm.h>
33	#include <iprt/assert.h>
34	#include <iprt/mem.h>
35	#include <iprt/string.h>
36
37	#include "PGMInline.h"
38
39
40	#ifdef VBOX_WITH_PAGE_SHARING
41
42	/*******************************************************************************
43	* Global Variables *
44	*******************************************************************************/
45	# ifdef VBOX_STRICT
46	/** Keep a copy of all registered shared modules for the .pgmcheckduppages debugger command. */
47	static PGMMREGISTERSHAREDMODULEREQ g_apSharedModules[512] = {0};
48	static unsigned g_cSharedModules = 0;
49	# endif /* VBOX_STRICT */
50
51
52	/**
53	* Registers a new shared module for the VM
54	*
55	* @returns VBox status code.
56	* @param pVM Pointer to the VM.
57	* @param enmGuestOS Guest OS type.
58	* @param pszModuleName Module name.
59	* @param pszVersion Module version.
60	* @param GCBaseAddr Module base address.
61	* @param cbModule Module size.
62	* @param cRegions Number of shared region descriptors.
63	* @param paRegions Shared region(s).
64	*
65	* @todo This should be a GMMR3 call. No need to involve GMM here.
66	*/
67	VMMR3DECL(int) PGMR3SharedModuleRegister(PVM pVM, VBOXOSFAMILY enmGuestOS, char pszModuleName, char pszVersion,
68	RTGCPTR GCBaseAddr, uint32_t cbModule, uint32_t cRegions,
69	VMMDEVSHAREDREGIONDESC const *paRegions)
70	{
71	Log(("PGMR3SharedModuleRegister family=%d name=%s version=%s base=%RGv size=%x cRegions=%d\n",
72	enmGuestOS, pszModuleName, pszVersion, GCBaseAddr, cbModule, cRegions));
73
74	/*
75	* Sanity check.
76	*/
77	AssertReturn(cRegions <= VMMDEVSHAREDREGIONDESC_MAX, VERR_INVALID_PARAMETER);
78
79	/*
80	* Allocate and initialize a GMM request.
81	*/
82	PGMMREGISTERSHAREDMODULEREQ pReq;
83	pReq = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
84	AssertReturn(pReq, VERR_NO_MEMORY);
85
86	pReq->enmGuestOS = enmGuestOS;
87	pReq->GCBaseAddr = GCBaseAddr;
88	pReq->cbModule = cbModule;
89	pReq->cRegions = cRegions;
90	for (uint32_t i = 0; i < cRegions; i++)
91	pReq->aRegions[i] = paRegions[i];
92
93	int rc = RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName);
94	if (RT_SUCCESS(rc))
95	{
96	rc = RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion);
97	if (RT_SUCCESS(rc))
98	{
99	/*
100	* Issue the request. In strict builds, do some local tracking.
101	*/
102	pgmR3PhysAssertSharedPageChecksums(pVM);
103	rc = GMMR3RegisterSharedModule(pVM, pReq);
104	if (RT_SUCCESS(rc))
105	rc = pReq->rc;
106	AssertMsg(rc == VINF_SUCCESS \|\| rc == VINF_GMM_SHARED_MODULE_ALREADY_REGISTERED, ("%Rrc\n", rc));
107
108	# ifdef VBOX_STRICT
109	if ( rc == VINF_SUCCESS
110	&& g_cSharedModules < RT_ELEMENTS(g_apSharedModules))
111	{
112	unsigned i;
113	for (i = 0; i < RT_ELEMENTS(g_apSharedModules); i++)
114	if (g_apSharedModules[i] == NULL)
115	{
116
117	size_t const cbSharedModule = RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]);
118	g_apSharedModules[i] = (PGMMREGISTERSHAREDMODULEREQ)RTMemDup(pReq, cbSharedModule);
119	g_cSharedModules++;
120	break;
121	}
122	Assert(i < RT_ELEMENTS(g_apSharedModules));
123	}
124	# endif /* VBOX_STRICT */
125	if (RT_SUCCESS(rc))
126	rc = VINF_SUCCESS;
127	}
128	}
129
130	RTMemFree(pReq);
131	return rc;
132	}
133
134
135	/**
136	* Unregisters a shared module for the VM
137	*
138	* @returns VBox status code.
139	* @param pVM Pointer to the VM.
140	* @param pszModuleName Module name.
141	* @param pszVersion Module version.
142	* @param GCBaseAddr Module base address.
143	* @param cbModule Module size.
144	*
145	* @todo This should be a GMMR3 call. No need to involve GMM here.
146	*/
147	VMMR3DECL(int) PGMR3SharedModuleUnregister(PVM pVM, char pszModuleName, char pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule)
148	{
149	Log(("PGMR3SharedModuleUnregister name=%s version=%s base=%RGv size=%x\n", pszModuleName, pszVersion, GCBaseAddr, cbModule));
150	AssertMsgReturn(cbModule > 0 && cbModule < _1G, ("%u\n", cbModule), VERR_OUT_OF_RANGE);
151
152
153	/*
154	* Forward the request to GMM (ring-0).
155	*/
156	PGMMUNREGISTERSHAREDMODULEREQ pReq = (PGMMUNREGISTERSHAREDMODULEREQ)RTMemAlloc(sizeof(*pReq));
157	AssertReturn(pReq, VERR_NO_MEMORY);
158
159	pReq->GCBaseAddr = GCBaseAddr;
160	pReq->u32Alignment = 0;
161	pReq->cbModule = cbModule;
162
163	int rc = RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName);
164	if (RT_SUCCESS(rc))
165	{
166	rc = RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion);
167	if (RT_SUCCESS(rc))
168	{
169	pgmR3PhysAssertSharedPageChecksums(pVM);
170	rc = GMMR3UnregisterSharedModule(pVM, pReq);
171	pgmR3PhysAssertSharedPageChecksums(pVM);
172
173	# ifdef VBOX_STRICT
174	/*
175	* Update our local tracking.
176	*/
177	for (unsigned i = 0; i < g_cSharedModules; i++)
178	{
179	if ( g_apSharedModules[i]
180	&& !strcmp(g_apSharedModules[i]->szName, pszModuleName)
181	&& !strcmp(g_apSharedModules[i]->szVersion, pszVersion))
182	{
183	RTMemFree(g_apSharedModules[i]);
184	g_apSharedModules[i] = NULL;
185	g_cSharedModules--;
186	break;
187	}
188	}
189	# endif /* VBOX_STRICT */
190	}
191	}
192
193	RTMemFree(pReq);
194	return rc;
195	}
196
197
198	/**
199	* Rendezvous callback that will be called once.
200	*
201	* @returns VBox strict status code.
202	* @param pVM Pointer to the VM.
203	* @param pVCpu Pointer to the VMCPU of the calling EMT.
204	* @param pvUser Pointer to a VMCPUID with the requester's ID.
205	*/
206	static DECLCALLBACK(VBOXSTRICTRC) pgmR3SharedModuleRegRendezvous(PVM pVM, PVMCPU pVCpu, void *pvUser)
207	{
208	VMCPUID idCpu = (VMCPUID )pvUser;
209
210	/* Execute on the VCPU that issued the original request to make sure we're in the right cr3 context. */
211	if (pVCpu->idCpu != idCpu)
212	{
213	Assert(pVM->cCpus > 1);
214	return VINF_SUCCESS;
215	}
216
217
218	/* Flush all pending handy page operations before changing any shared page assignments. */
219	int rc = PGMR3PhysAllocateHandyPages(pVM);
220	AssertRC(rc);
221
222	/*
223	* Lock it here as we can't deal with busy locks in this ring-0 path.
224	*/
225	LogFlow(("pgmR3SharedModuleRegRendezvous: start (%d)\n", pVM->pgm.s.cSharedPages));
226
227	pgmLock(pVM);
228	pgmR3PhysAssertSharedPageChecksums(pVM);
229	rc = GMMR3CheckSharedModules(pVM);
230	pgmR3PhysAssertSharedPageChecksums(pVM);
231	pgmUnlock(pVM);
232	AssertLogRelRC(rc);
233
234	LogFlow(("pgmR3SharedModuleRegRendezvous: done (%d)\n", pVM->pgm.s.cSharedPages));
235	return rc;
236	}
237
238	/**
239	* Shared module check helper (called on the way out).
240	*
241	* @param pVM Pointer to the VM.
242	* @param VMCPUID VCPU id
243	*/
244	static DECLCALLBACK(void) pgmR3CheckSharedModulesHelper(PVM pVM, VMCPUID idCpu)
245	{
246	/* We must stall other VCPUs as we'd otherwise have to send IPI flush commands for every single change we make. */
247	STAM_REL_PROFILE_START(&pVM->pgm.s.StatShModCheck, a);
248	int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ALL_AT_ONCE, pgmR3SharedModuleRegRendezvous, &idCpu);
249	AssertRCSuccess(rc);
250	STAM_REL_PROFILE_STOP(&pVM->pgm.s.StatShModCheck, a);
251	}
252
253
254	/**
255	* Check all registered modules for changes.
256	*
257	* @returns VBox status code.
258	* @param pVM Pointer to the VM
259	*/
260	VMMR3DECL(int) PGMR3SharedModuleCheckAll(PVM pVM)
261	{
262	/* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
263	return VMR3ReqCallNoWait(pVM, VMCPUID_ANY_QUEUE, (PFNRT)pgmR3CheckSharedModulesHelper, 2, pVM, VMMGetCpuId(pVM));
264	}
265
266
267	# ifdef DEBUG
268	/**
269	* Query the state of a page in a shared module
270	*
271	* @returns VBox status code.
272	* @param pVM Pointer to the VM.
273	* @param GCPtrPage Page address.
274	* @param pfShared Shared status (out).
275	* @param pfPageFlags Page flags (out).
276	*/
277	VMMR3DECL(int) PGMR3SharedModuleGetPageState(PVM pVM, RTGCPTR GCPtrPage, bool pfShared, uint64_t pfPageFlags)
278	{
279	/* Debug only API for the page fusion testcase. */
280	RTGCPHYS GCPhys;
281	uint64_t fFlags;
282
283	pgmLock(pVM);
284
285	int rc = PGMGstGetPage(VMMGetCpu(pVM), GCPtrPage, &fFlags, &GCPhys);
286	switch (rc)
287	{
288	case VINF_SUCCESS:
289	{
290	PPGMPAGE pPage = pgmPhysGetPage(pVM, GCPhys);
291	if (pPage)
292	{
293	*pfShared = PGM_PAGE_IS_SHARED(pPage);
294	*pfPageFlags = fFlags;
295	}
296	else
297	rc = VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
298	break;
299	}
300
301	case VERR_PAGE_NOT_PRESENT:
302	case VERR_PAGE_TABLE_NOT_PRESENT:
303	case VERR_PAGE_MAP_LEVEL4_NOT_PRESENT:
304	case VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT:
305	*pfShared = false;
306	*pfPageFlags = 0;
307	rc = VINF_SUCCESS;
308	break;
309
310	default:
311	break;
312	}
313
314	pgmUnlock(pVM);
315	return rc;
316	}
317	# endif /* DEBUG */
318
319	# ifdef VBOX_STRICT
320
321	/**
322	* @callback_method_impl{FNDBGCCMD, The '.pgmcheckduppages' command.}
323	*/
324	DECLCALLBACK(int) pgmR3CmdCheckDuplicatePages(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
325	{
326	unsigned cBallooned = 0;
327	unsigned cShared = 0;
328	unsigned cZero = 0;
329	unsigned cUnique = 0;
330	unsigned cDuplicate = 0;
331	unsigned cAllocZero = 0;
332	unsigned cPages = 0;
333	NOREF(pCmd); NOREF(paArgs); NOREF(cArgs);
334	PVM pVM = pUVM->pVM;
335	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
336
337	pgmLock(pVM);
338
339	for (PPGMRAMRANGE pRam = pVM->pgm.s.pRamRangesXR3; pRam; pRam = pRam->pNextR3)
340	{
341	PPGMPAGE pPage = &pRam->aPages[0];
342	RTGCPHYS GCPhys = pRam->GCPhys;
343	uint32_t cLeft = pRam->cb >> PAGE_SHIFT;
344	while (cLeft-- > 0)
345	{
346	if (PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM)
347	{
348	switch (PGM_PAGE_GET_STATE(pPage))
349	{
350	case PGM_PAGE_STATE_ZERO:
351	cZero++;
352	break;
353
354	case PGM_PAGE_STATE_BALLOONED:
355	cBallooned++;
356	break;
357
358	case PGM_PAGE_STATE_SHARED:
359	cShared++;
360	break;
361
362	case PGM_PAGE_STATE_ALLOCATED:
363	case PGM_PAGE_STATE_WRITE_MONITORED:
364	{
365	/* Check if the page was allocated, but completely zero. */
366	PGMPAGEMAPLOCK PgMpLck;
367	const void *pvPage;
368	int rc = pgmPhysGCPhys2CCPtrInternalReadOnly(pVM, pPage, GCPhys, &pvPage, &PgMpLck);
369	if ( RT_SUCCESS(rc)
370	&& ASMMemIsZeroPage(pvPage))
371	cAllocZero++;
372	else if (GMMR3IsDuplicatePage(pVM, PGM_PAGE_GET_PAGEID(pPage)))
373	cDuplicate++;
374	else
375	cUnique++;
376	if (RT_SUCCESS(rc))
377	pgmPhysReleaseInternalPageMappingLock(pVM, &PgMpLck);
378	break;
379	}
380
381	default:
382	AssertFailed();
383	break;
384	}
385	}
386
387	/* next */
388	pPage++;
389	GCPhys += PAGE_SIZE;
390	cPages++;
391	/* Give some feedback for every processed megabyte. */
392	if ((cPages & 0x7f) == 0)
393	pCmdHlp->pfnPrintf(pCmdHlp, NULL, ".");
394	}
395	}
396	pgmUnlock(pVM);
397
398	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "\nNumber of zero pages %08x (%d MB)\n", cZero, cZero / 256);
399	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of alloczero pages %08x (%d MB)\n", cAllocZero, cAllocZero / 256);
400	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of ballooned pages %08x (%d MB)\n", cBallooned, cBallooned / 256);
401	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of shared pages %08x (%d MB)\n", cShared, cShared / 256);
402	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of unique pages %08x (%d MB)\n", cUnique, cUnique / 256);
403	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of duplicate pages %08x (%d MB)\n", cDuplicate, cDuplicate / 256);
404	return VINF_SUCCESS;
405	}
406
407
408	/**
409	* @callback_method_impl{FNDBGCCMD, The '.pgmsharedmodules' command.}
410	*/
411	DECLCALLBACK(int) pgmR3CmdShowSharedModules(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
412	{
413	NOREF(pCmd); NOREF(paArgs); NOREF(cArgs);
414	PVM pVM = pUVM->pVM;
415	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
416
417	pgmLock(pVM);
418	for (unsigned i = 0; i < RT_ELEMENTS(g_apSharedModules); i++)
419	{
420	if (g_apSharedModules[i])
421	{
422	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Shared module %s (%s):\n", g_apSharedModules[i]->szName, g_apSharedModules[i]->szVersion);
423	for (unsigned j = 0; j < g_apSharedModules[i]->cRegions; j++)
424	pCmdHlp->pfnPrintf(pCmdHlp, NULL, "--- Region %d: base %RGv size %x\n", j, g_apSharedModules[i]->aRegions[j].GCRegionAddr, g_apSharedModules[i]->aRegions[j].cbRegion);
425	}
426	}
427	pgmUnlock(pVM);
428
429	return VINF_SUCCESS;
430	}
431
432	# endif /* VBOX_STRICT*/
433	#endif /* VBOX_WITH_PAGE_SHARING */

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source: vbox/trunk/src/VBox/VMM/VMMR3/PGMSharedPage.cpp@ 48565

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