VBoxServicePageSharing.cpp@ 30655

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1	/* $Id: VBoxServicePageSharing.cpp 30655 2010-07-06 11:31:13Z vboxsync $ */
2	/** @file
3	* VBoxService - Guest page sharing.
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.215389.xyz. 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	#include <iprt/assert.h>
23	#include <iprt/avl.h>
24	#include <iprt/asm.h>
25	#include <iprt/mem.h>
26	#include <iprt/process.h>
27	#include <iprt/env.h>
28	#include <iprt/stream.h>
29	#include <iprt/file.h>
30	#include <iprt/string.h>
31	#include <iprt/semaphore.h>
32	#include <iprt/system.h>
33	#include <iprt/thread.h>
34	#include <iprt/time.h>
35	#include <VBox/VBoxGuestLib.h>
36	#include "VBoxServiceInternal.h"
37	#include "VBoxServiceUtils.h"
38
39
40	/*******************************************************************************
41	* Global Variables *
42	*******************************************************************************/
43
44	/** The semaphore we're blocking on. */
45	static RTSEMEVENTMULTI g_PageSharingEvent = NIL_RTSEMEVENTMULTI;
46
47	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
48	#include <tlhelp32.h>
49	#include <psapi.h>
50	#include <winternl.h>
51
52	typedef struct
53	{
54	AVLPVNODECORE Core;
55	HMODULE hModule;
56	char szFileVersion[16];
57	MODULEENTRY32 Info;
58	} KNOWN_MODULE, *PKNOWN_MODULE;
59
60	#define SystemModuleInformation 11
61
62	typedef struct _RTL_PROCESS_MODULE_INFORMATION
63	{
64	ULONG Section;
65	PVOID MappedBase;
66	PVOID ImageBase;
67	ULONG ImageSize;
68	ULONG Flags;
69	USHORT LoadOrderIndex;
70	USHORT InitOrderIndex;
71	USHORT LoadCount;
72	USHORT OffsetToFileName;
73	CHAR FullPathName[256];
74	} RTL_PROCESS_MODULE_INFORMATION, *PRTL_PROCESS_MODULE_INFORMATION;
75
76	typedef struct _RTL_PROCESS_MODULES
77	{
78	ULONG NumberOfModules;
79	RTL_PROCESS_MODULE_INFORMATION Modules[1];
80	} RTL_PROCESS_MODULES, *PRTL_PROCESS_MODULES;
81
82	typedef NTSTATUS (WINAPI *PFNZWQUERYSYSTEMINFORMATION)(ULONG, PVOID, ULONG, PULONG);
83	static PFNZWQUERYSYSTEMINFORMATION ZwQuerySystemInformation = NULL;
84	static HMODULE hNtdll = 0;
85
86
87	static DECLCALLBACK(int) VBoxServicePageSharingEmptyTreeCallback(PAVLPVNODECORE pNode, void *pvUser);
88
89	static PAVLPVNODECORE pKnownModuleTree = NULL;
90
91	/**
92	* Registers a new module with the VMM
93	* @param pModule Module ptr
94	* @param fValidateMemory Validate/touch memory pages or not
95	*/
96	void VBoxServicePageSharingRegisterModule(PKNOWN_MODULE pModule, bool fValidateMemory)
97	{
98	VMMDEVSHAREDREGIONDESC aRegions[VMMDEVSHAREDREGIONDESC_MAX];
99	DWORD dwModuleSize = pModule->Info.modBaseSize;
100	BYTE *pBaseAddress = pModule->Info.modBaseAddr;
101	DWORD cbVersionSize, dummy;
102	BYTE *pVersionInfo;
103
104	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule\n");
105
106	cbVersionSize = GetFileVersionInfoSize(pModule->Info.szExePath, &dummy);
107	if (!cbVersionSize)
108	{
109	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: GetFileVersionInfoSize failed with %d\n", GetLastError());
110	return;
111	}
112	pVersionInfo = (BYTE *)RTMemAlloc(cbVersionSize);
113	if (!pVersionInfo)
114	return;
115
116	if (!GetFileVersionInfo(pModule->Info.szExePath, 0, cbVersionSize, pVersionInfo))
117	{
118	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: GetFileVersionInfo failed with %d\n", GetLastError());
119	goto end;
120	}
121
122	/* Fetch default code page. */
123	struct LANGANDCODEPAGE {
124	WORD wLanguage;
125	WORD wCodePage;
126	} *lpTranslate;
127
128	UINT cbTranslate;
129	BOOL ret = VerQueryValue(pVersionInfo, TEXT("\\VarFileInfo\\Translation"), (LPVOID *)&lpTranslate, &cbTranslate);
130	if ( !ret
131	\|\| cbTranslate < 4)
132	{
133	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VerQueryValue failed with %d (cb=%d)\n", GetLastError(), cbTranslate);
134	goto end;
135	}
136
137	unsigned i;
138	UINT cbFileVersion;
139	char *lpszFileVersion;
140	unsigned cTranslationBlocks = cbTranslate/sizeof(struct LANGANDCODEPAGE);
141
142	for(i = 0; i < cTranslationBlocks; i++)
143	{
144	/* Fetch file version string. */
145	char szFileVersionLocation[256];
146
147	sprintf(szFileVersionLocation, TEXT("\\StringFileInfo\\%04x%04x\\FileVersion"), lpTranslate[i].wLanguage, lpTranslate[i].wCodePage);
148	ret = VerQueryValue(pVersionInfo, szFileVersionLocation, (LPVOID *)&lpszFileVersion, &cbFileVersion);
149	if (ret)
150	break;
151	}
152	if (i == cTranslationBlocks)
153	{
154	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: no file version found!\n");
155	goto end;
156	}
157
158	_snprintf(pModule->szFileVersion, sizeof(pModule->szFileVersion), "%s", lpszFileVersion);
159	pModule->szFileVersion[RT_ELEMENTS(pModule->szFileVersion) - 1] = 0;
160
161	unsigned idxRegion = 0;
162
163	if (fValidateMemory)
164	{
165	do
166	{
167	MEMORY_BASIC_INFORMATION MemInfo;
168
169	SIZE_T ret = VirtualQuery(pBaseAddress, &MemInfo, sizeof(MemInfo));
170	Assert(ret);
171	if (!ret)
172	{
173	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VirtualQueryEx failed with %d\n", GetLastError());
174	break;
175	}
176
177	if ( MemInfo.State == MEM_COMMIT
178	&& MemInfo.Type == MEM_IMAGE)
179	{
180	switch (MemInfo.Protect)
181	{
182	case PAGE_EXECUTE:
183	case PAGE_EXECUTE_READ:
184	case PAGE_READONLY:
185	{
186	char pRegion = (char )MemInfo.BaseAddress;
187
188	/* Skip the first region as it only contains the image file header. */
189	if (pRegion != (char *)pModule->Info.modBaseAddr)
190	{
191	/* Touch all pages. */
192	while (pRegion < (char *)MemInfo.BaseAddress + MemInfo.RegionSize)
193	{
194	/* Try to trick the optimizer to leave the page touching code in place. */
195	ASMProbeReadByte(pRegion);
196	pRegion += PAGE_SIZE;
197	}
198	}
199	#ifdef RT_ARCH_X86
200	aRegions[idxRegion].GCRegionAddr = (RTGCPTR32)MemInfo.BaseAddress;
201	#else
202	aRegions[idxRegion].GCRegionAddr = (RTGCPTR64)MemInfo.BaseAddress;
203	#endif
204	aRegions[idxRegion].cbRegion = MemInfo.RegionSize;
205	idxRegion++;
206
207	break;
208	}
209
210	default:
211	break; /* ignore */
212	}
213	}
214
215	pBaseAddress = (BYTE *)MemInfo.BaseAddress + MemInfo.RegionSize;
216	if (dwModuleSize > MemInfo.RegionSize)
217	{
218	dwModuleSize -= MemInfo.RegionSize;
219	}
220	else
221	{
222	dwModuleSize = 0;
223	break;
224	}
225
226	if (idxRegion >= RT_ELEMENTS(aRegions))
227	break; /* out of room */
228	}
229	while (dwModuleSize);
230	}
231	else
232	{
233	/* We can't probe kernel memory ranges, so pretend it's one big region. */
234	#ifdef RT_ARCH_X86
235	aRegions[idxRegion].GCRegionAddr = (RTGCPTR32)pBaseAddress;
236	#else
237	aRegions[idxRegion].GCRegionAddr = (RTGCPTR64)pBaseAddress;
238	#endif
239	aRegions[idxRegion].cbRegion = dwModuleSize;
240	idxRegion++;
241	}
242	VBoxServiceVerbose(3, "VbglR3RegisterSharedModule %s %s base=%p size=%x cregions=%d\n", pModule->Info.szModule, pModule->szFileVersion, pModule->Info.modBaseAddr, pModule->Info.modBaseSize, idxRegion);
243	#ifdef RT_ARCH_X86
244	int rc = VbglR3RegisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR32)pModule->Info.modBaseAddr,
245	pModule->Info.modBaseSize, idxRegion, aRegions);
246	#else
247	int rc = VbglR3RegisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR64)pModule->Info.modBaseAddr,
248	pModule->Info.modBaseSize, idxRegion, aRegions);
249	#endif
250
251	// AssertRC(rc);
252	if (RT_FAILURE(rc))
253	VBoxServiceVerbose(3, "VbglR3RegisterSharedModule failed with %d\n", rc);
254
255	end:
256	RTMemFree(pVersionInfo);
257	return;
258	}
259
260	/**
261	* Inspect all loaded modules for the specified process
262	* @param dwProcessId Process id
263	*/
264	void VBoxServicePageSharingInspectModules(DWORD dwProcessId, PAVLPVNODECORE *ppNewTree)
265	{
266	HANDLE hProcess, hSnapshot;
267
268	/* Get a list of all the modules in this process. */
269	hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,
270	FALSE /* no child process handle inheritance */, dwProcessId);
271	if (hProcess == NULL)
272	{
273	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules: OpenProcess %x failed with %d\n", dwProcessId, GetLastError());
274	return;
275	}
276
277	hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, dwProcessId);
278	if (hSnapshot == INVALID_HANDLE_VALUE)
279	{
280	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules: CreateToolhelp32Snapshot failed with %d\n", GetLastError());
281	CloseHandle(hProcess);
282	return;
283	}
284
285	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules\n");
286
287	MODULEENTRY32 ModuleInfo;
288	BOOL bRet;
289
290	ModuleInfo.dwSize = sizeof(ModuleInfo);
291	bRet = Module32First(hSnapshot, &ModuleInfo);
292	do
293	{
294	/** todo when changing this make sure VBoxService.exe is excluded! */
295	char *pszDot = strrchr(ModuleInfo.szModule, '.');
296	if ( pszDot
297	&& (pszDot[1] == 'e' \|\| pszDot[1] == 'E'))
298	continue; /* ignore executables for now. */
299
300	/* Found it before? */
301	PAVLPVNODECORE pRec = RTAvlPVGet(ppNewTree, ModuleInfo.modBaseAddr);
302	if (!pRec)
303	{
304	pRec = RTAvlPVRemove(&pKnownModuleTree, ModuleInfo.modBaseAddr);
305	if (!pRec)
306	{
307	/* New module; register it. */
308	PKNOWN_MODULE pModule = (PKNOWN_MODULE)RTMemAllocZ(sizeof(*pModule));
309	Assert(pModule);
310	if (!pModule)
311	break;
312
313	pModule->Info = ModuleInfo;
314	pModule->Core.Key = ModuleInfo.modBaseAddr;
315	pModule->hModule = LoadLibraryEx(ModuleInfo.szExePath, 0, DONT_RESOLVE_DLL_REFERENCES);
316	if (pModule->hModule)
317	VBoxServicePageSharingRegisterModule(pModule, true /* validate pages */);
318
319	VBoxServiceVerbose(3, "\n\n MODULE NAME: %s", ModuleInfo.szModule );
320	VBoxServiceVerbose(3, "\n executable = %s", ModuleInfo.szExePath );
321	VBoxServiceVerbose(3, "\n process ID = 0x%08X", ModuleInfo.th32ProcessID );
322	VBoxServiceVerbose(3, "\n base address = 0x%08X", (DWORD) ModuleInfo.modBaseAddr );
323	VBoxServiceVerbose(3, "\n base size = %d", ModuleInfo.modBaseSize );
324
325	pRec = &pModule->Core;
326	}
327	bool ret = RTAvlPVInsert(ppNewTree, pRec);
328	Assert(ret); NOREF(ret);
329	}
330	}
331	while (Module32Next(hSnapshot, &ModuleInfo));
332
333	CloseHandle(hSnapshot);
334	CloseHandle(hProcess);
335	}
336
337	/**
338	* Inspect all running processes for executables and dlls that might be worth sharing
339	* with other VMs.
340	*
341	*/
342	void VBoxServicePageSharingInspectGuest()
343	{
344	HANDLE hSnapshot;
345	PAVLPVNODECORE pNewTree = NULL;
346	DWORD dwProcessId = GetCurrentProcessId();
347	bool fFirstCheck = (pKnownModuleTree == NULL);
348
349	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectGuest\n");
350
351	hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
352	if (hSnapshot == INVALID_HANDLE_VALUE)
353	{
354	VBoxServiceVerbose(3, "CreateToolhelp32Snapshot failed with %d\n", GetLastError());
355	return;
356	}
357
358	/* Check loaded modules for all running processes. */
359	PROCESSENTRY32 ProcessInfo;
360
361	ProcessInfo.dwSize = sizeof(ProcessInfo);
362	Process32First(hSnapshot, &ProcessInfo);
363
364	do
365	{
366	/* Skip our own process. */
367	if (ProcessInfo.th32ProcessID != dwProcessId)
368	VBoxServicePageSharingInspectModules(ProcessInfo.th32ProcessID, &pNewTree);
369	}
370	while (Process32Next(hSnapshot, &ProcessInfo));
371
372	CloseHandle(hSnapshot);
373
374	/* Check all loaded kernel modules. */
375	if (ZwQuerySystemInformation)
376	{
377	ULONG cbBuffer = 0;
378	PVOID pBuffer = NULL;
379	PRTL_PROCESS_MODULES pSystemModules;
380
381	NTSTATUS ret = ZwQuerySystemInformation(SystemModuleInformation, (PVOID)&cbBuffer, 0, &cbBuffer);
382	if (!cbBuffer)
383	{
384	VBoxServiceVerbose(1, "ZwQuerySystemInformation returned length 0\n");
385	goto skipkernelmodules;
386	}
387
388	pBuffer = RTMemAllocZ(cbBuffer);
389	if (!pBuffer)
390	goto skipkernelmodules;
391
392	ret = ZwQuerySystemInformation(SystemModuleInformation, pBuffer, cbBuffer, &cbBuffer);
393	if (ret != STATUS_SUCCESS)
394	{
395	VBoxServiceVerbose(1, "ZwQuerySystemInformation returned %x (1)\n", ret);
396	goto skipkernelmodules;
397	}
398
399	pSystemModules = (PRTL_PROCESS_MODULES)pBuffer;
400	for (unsigned i = 0; i < pSystemModules->NumberOfModules; i++)
401	{
402	VBoxServiceVerbose(4, "\n\n KERNEL MODULE NAME: %s", pSystemModules->Modules[i].FullPathName[pSystemModules->Modules[i].OffsetToFileName] );
403	VBoxServiceVerbose(4, "\n executable = %s", pSystemModules->Modules[i].FullPathName );
404	VBoxServiceVerbose(4, "\n flags = 0x%08X\n", pSystemModules->Modules[i].Flags);
405
406	/* User-mode modules seem to have no flags set; skip them as we detected them above. */
407	if (pSystemModules->Modules[i].Flags == 0)
408	continue;
409
410	/* Found it before? */
411	PAVLPVNODECORE pRec = RTAvlPVGet(&pNewTree, pSystemModules->Modules[i].ImageBase);
412	if (!pRec)
413	{
414	pRec = RTAvlPVRemove(&pKnownModuleTree, pSystemModules->Modules[i].ImageBase);
415	if (!pRec)
416	{
417	/* New module; register it. */
418	char szFullFilePath[512];
419	PKNOWN_MODULE pModule = (PKNOWN_MODULE)RTMemAllocZ(sizeof(*pModule));
420	Assert(pModule);
421	if (!pModule)
422	break;
423
424	strcpy(pModule->Info.szModule, &pSystemModules->Modules[i].FullPathName[pSystemModules->Modules[i].OffsetToFileName]);
425	GetSystemDirectoryA(szFullFilePath, sizeof(szFullFilePath));
426
427	/* skip \Systemroot\system32 */
428	char *lpPath = strchr(&pSystemModules->Modules[i].FullPathName[1], '\\');
429	if (!lpPath)
430	{
431	/* Seen just file names in XP; try to locate the file in the system32 and system32\drivers directories. */
432	strcat(szFullFilePath, "\\");
433	strcat(szFullFilePath, pSystemModules->Modules[i].FullPathName);
434	VBoxServiceVerbose(3, "Unexpected kernel module name try %s\n", szFullFilePath);
435	if (RTFileExists(szFullFilePath) == false)
436	{
437	GetSystemDirectoryA(szFullFilePath, sizeof(szFullFilePath));
438	strcat(szFullFilePath, "\\drivers\\");
439	strcat(szFullFilePath, pSystemModules->Modules[i].FullPathName);
440	VBoxServiceVerbose(3, "Unexpected kernel module name try %s\n", szFullFilePath);
441	if (RTFileExists(szFullFilePath) == false)
442	{
443	VBoxServiceVerbose(1, "Unexpected kernel module name %s\n", pSystemModules->Modules[i].FullPathName);
444	RTMemFree(pModule);
445	continue;
446	}
447	}
448	}
449	else
450	{
451	lpPath = strchr(lpPath+1, '\\');
452	if (!lpPath)
453	{
454	VBoxServiceVerbose(1, "Unexpected kernel module name %s (2)\n", pSystemModules->Modules[i].FullPathName);
455	RTMemFree(pModule);
456	continue;
457	}
458
459	strcat(szFullFilePath, lpPath);
460	}
461
462	strcpy(pModule->Info.szExePath, szFullFilePath);
463	pModule->Info.modBaseAddr = (BYTE *)pSystemModules->Modules[i].ImageBase;
464	pModule->Info.modBaseSize = pSystemModules->Modules[i].ImageSize;
465
466	pModule->Core.Key = pSystemModules->Modules[i].ImageBase;
467	VBoxServicePageSharingRegisterModule(pModule, false /* don't check memory pages */);
468
469	VBoxServiceVerbose(3, "\n\n KERNEL MODULE NAME: %s", pModule->Info.szModule );
470	VBoxServiceVerbose(3, "\n executable = %s", pModule->Info.szExePath );
471	VBoxServiceVerbose(3, "\n base address = 0x%08X", (DWORD) pModule->Info.modBaseAddr );
472	VBoxServiceVerbose(3, "\n flags = 0x%08X", pSystemModules->Modules[i].Flags);
473	VBoxServiceVerbose(3, "\n base size = %d", pModule->Info.modBaseSize );
474
475	pRec = &pModule->Core;
476	}
477	bool ret = RTAvlPVInsert(&pNewTree, pRec);
478	Assert(ret); NOREF(ret);
479	}
480	}
481	skipkernelmodules:
482	if (pBuffer)
483	RTMemFree(pBuffer);
484	}
485
486	/* Delete leftover modules in the old tree. */
487	RTAvlPVDestroy(&pKnownModuleTree, VBoxServicePageSharingEmptyTreeCallback, NULL);
488
489	/* Check all registered modules. */
490	int rc = VbglR3CheckSharedModules();
491	if ( rc == VINF_PGM_SHARED_MODULE_FIRST_CHECK
492	&& !fFirstCheck)
493	{
494	bool fUnregister = false;
495	/* The VM was restored, so reregister all modules the next time. */
496	RTAvlPVDestroy(&pNewTree, VBoxServicePageSharingEmptyTreeCallback, &fUnregister);
497	pKnownModuleTree = NULL;
498	}
499	else
500	{
501	/* Activate new module tree. */
502	pKnownModuleTree = pNewTree;
503	}
504	}
505
506	/**
507	* RTAvlPVDestroy callback.
508	*/
509	static DECLCALLBACK(int) VBoxServicePageSharingEmptyTreeCallback(PAVLPVNODECORE pNode, void *pvUser)
510	{
511	PKNOWN_MODULE pModule = (PKNOWN_MODULE)pNode;
512	bool pfUnregister = (bool )pvUser;
513
514	VBoxServiceVerbose(3, "VBoxServicePageSharingEmptyTreeCallback %s %s\n", pModule->Info.szModule, pModule->szFileVersion);
515
516	/* Dereference module in the hypervisor. */
517	if ( !pfUnregister
518	\|\| *pfUnregister == true)
519	{
520	#ifdef RT_ARCH_X86
521	int rc = VbglR3UnregisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR32)pModule->Info.modBaseAddr, pModule->Info.modBaseSize);
522	#else
523	int rc = VbglR3UnregisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR64)pModule->Info.modBaseAddr, pModule->Info.modBaseSize);
524	#endif
525	AssertRC(rc);
526	}
527
528	if (pModule->hModule)
529	FreeLibrary(pModule->hModule);
530	RTMemFree(pNode);
531	return 0;
532	}
533
534
535	#elif TARGET_NT4
536	void VBoxServicePageSharingInspectGuest()
537	{
538	/* not implemented */
539	}
540	#else
541	void VBoxServicePageSharingInspectGuest()
542	{
543	/* @todo other platforms */
544	}
545	#endif
546
547	/** @copydoc VBOXSERVICE::pfnPreInit */
548	static DECLCALLBACK(int) VBoxServicePageSharingPreInit(void)
549	{
550	return VINF_SUCCESS;
551	}
552
553
554	/** @copydoc VBOXSERVICE::pfnOption */
555	static DECLCALLBACK(int) VBoxServicePageSharingOption(const char ppszShort, int argc, char argv, int *pi)
556	{
557	NOREF(ppszShort);
558	NOREF(argc);
559	NOREF(argv);
560	NOREF(pi);
561	return VINF_SUCCESS;
562	}
563
564
565	/** @copydoc VBOXSERVICE::pfnInit */
566	static DECLCALLBACK(int) VBoxServicePageSharingInit(void)
567	{
568	VBoxServiceVerbose(3, "VBoxServicePageSharingInit\n");
569
570	int rc = RTSemEventMultiCreate(&g_PageSharingEvent);
571	AssertRCReturn(rc, rc);
572
573	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
574	hNtdll = LoadLibrary("ntdll.dll");
575
576	if (hNtdll)
577	ZwQuerySystemInformation = (PFNZWQUERYSYSTEMINFORMATION)GetProcAddress(hNtdll, "ZwQuerySystemInformation");
578	#endif
579
580	/* Never fail here. */
581	return VINF_SUCCESS;
582	}
583
584	/** @copydoc VBOXSERVICE::pfnWorker */
585	DECLCALLBACK(int) VBoxServicePageSharingWorker(bool volatile *pfShutdown)
586	{
587	/*
588	* Tell the control thread that it can continue
589	* spawning services.
590	*/
591	RTThreadUserSignal(RTThreadSelf());
592
593	/*
594	* Now enter the loop retrieving runtime data continuously.
595	*/
596	for (;;)
597	{
598	VBoxServiceVerbose(3, "VBoxServicePageSharingWorker: enabled=%d\n", VbglR3PageSharingIsEnabled());
599
600	if (VbglR3PageSharingIsEnabled())
601	VBoxServicePageSharingInspectGuest();
602
603	/*
604	* Block for a minute.
605	*
606	* The event semaphore takes care of ignoring interruptions and it
607	* allows us to implement service wakeup later.
608	*/
609	if (*pfShutdown)
610	break;
611	int rc = RTSemEventMultiWait(g_PageSharingEvent, 60000);
612	if (*pfShutdown)
613	break;
614	if (rc != VERR_TIMEOUT && RT_FAILURE(rc))
615	{
616	VBoxServiceError("RTSemEventMultiWait failed; rc=%Rrc\n", rc);
617	break;
618	}
619	}
620
621	RTSemEventMultiDestroy(g_PageSharingEvent);
622	g_PageSharingEvent = NIL_RTSEMEVENTMULTI;
623
624	VBoxServiceVerbose(3, "VBoxServicePageSharingWorker: finished thread\n");
625	return 0;
626	}
627
628	#ifdef RT_OS_WINDOWS
629
630	/**
631	* This gets control when VBoxService is launched with -pagefusionfork by
632	* VBoxServicePageSharingWorkerProcess().
633	*
634	* @returns RTEXITCODE_SUCCESS.
635	*
636	* @remarks It won't normally return since the parent drops the shutdown hint
637	* via RTProcTerminate().
638	*/
639	RTEXITCODE VBoxServicePageSharingInitFork(void)
640	{
641	VBoxServiceVerbose(3, "VBoxServicePageSharingInitFork\n");
642
643	bool fShutdown = false;
644	VBoxServicePageSharingInit();
645	VBoxServicePageSharingWorker(&fShutdown);
646
647	return RTEXITCODE_SUCCESS;
648	}
649
650	/** @copydoc VBOXSERVICE::pfnWorker */
651	DECLCALLBACK(int) VBoxServicePageSharingWorkerProcess(bool volatile *pfShutdown)
652	{
653	RTPROCESS hProcess = NIL_RTPROCESS;
654	int rc;
655
656	/*
657	* Tell the control thread that it can continue
658	* spawning services.
659	*/
660	RTThreadUserSignal(RTThreadSelf());
661
662	/*
663	* Now enter the loop retrieving runtime data continuously.
664	*/
665	for (;;)
666	{
667	VBoxServiceVerbose(3, "VBoxServicePageSharingWorkerProcess: enabled=%d\n", VbglR3PageSharingIsEnabled());
668
669	if ( VbglR3PageSharingIsEnabled()
670	&& hProcess == NIL_RTPROCESS)
671	{
672	char szExeName[256];
673	char *pszExeName;
674	char *pszArgs[3];
675
676	pszExeName = RTProcGetExecutableName(szExeName, sizeof(szExeName));
677
678	if (pszExeName)
679	{
680	pszArgs[0] = pszExeName;
681	pszArgs[1] = "-pagefusionfork";
682	pszArgs[2] = NULL;
683	/* Start a 2nd VBoxService process to deal with page fusion as we do not wish to dummy load
684	* dlls into this process. (first load with DONT_RESOLVE_DLL_REFERENCES, 2nd normal -> dll init routines not called!)
685	*/
686	rc = RTProcCreate(pszExeName, pszArgs, RTENV_DEFAULT, 0 /* normal child */, &hProcess);
687	if (rc != VINF_SUCCESS)
688	VBoxServiceError("RTProcCreate %s failed; rc=%Rrc\n", pszExeName, rc);
689	}
690	}
691
692	/*
693	* Block for a minute.
694	*
695	* The event semaphore takes care of ignoring interruptions and it
696	* allows us to implement service wakeup later.
697	*/
698	if (*pfShutdown)
699	break;
700	rc = RTSemEventMultiWait(g_PageSharingEvent, 60000);
701	if (*pfShutdown)
702	break;
703	if (rc != VERR_TIMEOUT && RT_FAILURE(rc))
704	{
705	VBoxServiceError("RTSemEventMultiWait failed; rc=%Rrc\n", rc);
706	break;
707	}
708	}
709
710	if (hProcess)
711	RTProcTerminate(hProcess);
712
713	RTSemEventMultiDestroy(g_PageSharingEvent);
714	g_PageSharingEvent = NIL_RTSEMEVENTMULTI;
715
716	VBoxServiceVerbose(3, "VBoxServicePageSharingWorkerProcess: finished thread\n");
717	return 0;
718	}
719
720	#endif /* RT_OS_WINDOWS */
721
722	/** @copydoc VBOXSERVICE::pfnTerm */
723	static DECLCALLBACK(void) VBoxServicePageSharingTerm(void)
724	{
725	VBoxServiceVerbose(3, "VBoxServicePageSharingTerm\n");
726
727	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
728	if (hNtdll)
729	FreeLibrary(hNtdll);
730	#endif
731	return;
732	}
733
734
735	/** @copydoc VBOXSERVICE::pfnStop */
736	static DECLCALLBACK(void) VBoxServicePageSharingStop(void)
737	{
738	RTSemEventMultiSignal(g_PageSharingEvent);
739	}
740
741
742	/**
743	* The 'pagesharing' service description.
744	*/
745	VBOXSERVICE g_PageSharing =
746	{
747	/* pszName. */
748	"pagesharing",
749	/* pszDescription. */
750	"Page Sharing",
751	/* pszUsage. */
752	NULL,
753	/* pszOptions. */
754	NULL,
755	/* methods */
756	VBoxServicePageSharingPreInit,
757	VBoxServicePageSharingOption,
758	VBoxServicePageSharingInit,
759	#ifdef RT_OS_WINDOWS
760	VBoxServicePageSharingWorkerProcess,
761	#else
762	VBoxServicePageSharingWorker,
763	#endif
764	VBoxServicePageSharingStop,
765	VBoxServicePageSharingTerm
766	};

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServicePageSharing.cpp@ 30655

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