VBoxServicePageSharing.cpp@ 34079

Last change on this file since 34079 was 33806, checked in by vboxsync, 14 years ago
ExtPack changes, related IPRT changes.
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1	/* $Id: VBoxServicePageSharing.cpp 33806 2010-11-05 17:20:15Z 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.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	#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 g_pKnownModuleTree = NULL;
90	static uint64_t g_idSession = 0;
91
92	/**
93	* Registers a new module with the VMM
94	* @param pModule Module ptr
95	* @param fValidateMemory Validate/touch memory pages or not
96	*/
97	void VBoxServicePageSharingRegisterModule(PKNOWN_MODULE pModule, bool fValidateMemory)
98	{
99	VMMDEVSHAREDREGIONDESC aRegions[VMMDEVSHAREDREGIONDESC_MAX];
100	DWORD dwModuleSize = pModule->Info.modBaseSize;
101	BYTE *pBaseAddress = pModule->Info.modBaseAddr;
102	DWORD cbVersionSize, dummy;
103	BYTE *pVersionInfo;
104
105	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule\n");
106
107	cbVersionSize = GetFileVersionInfoSize(pModule->Info.szExePath, &dummy);
108	if (!cbVersionSize)
109	{
110	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: GetFileVersionInfoSize failed with %d\n", GetLastError());
111	return;
112	}
113	pVersionInfo = (BYTE *)RTMemAlloc(cbVersionSize);
114	if (!pVersionInfo)
115	return;
116
117	if (!GetFileVersionInfo(pModule->Info.szExePath, 0, cbVersionSize, pVersionInfo))
118	{
119	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: GetFileVersionInfo failed with %d\n", GetLastError());
120	goto end;
121	}
122
123	/* Fetch default code page. */
124	struct LANGANDCODEPAGE {
125	WORD wLanguage;
126	WORD wCodePage;
127	} *lpTranslate;
128
129	UINT cbTranslate;
130	BOOL ret = VerQueryValue(pVersionInfo, TEXT("\\VarFileInfo\\Translation"), (LPVOID *)&lpTranslate, &cbTranslate);
131	if ( !ret
132	\|\| cbTranslate < 4)
133	{
134	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VerQueryValue failed with %d (cb=%d)\n", GetLastError(), cbTranslate);
135	goto end;
136	}
137
138	unsigned i;
139	UINT cbFileVersion;
140	char *lpszFileVersion;
141	unsigned cTranslationBlocks = cbTranslate/sizeof(struct LANGANDCODEPAGE);
142
143	for(i = 0; i < cTranslationBlocks; i++)
144	{
145	/* Fetch file version string. */
146	char szFileVersionLocation[256];
147
148	sprintf(szFileVersionLocation, TEXT("\\StringFileInfo\\%04x%04x\\FileVersion"), lpTranslate[i].wLanguage, lpTranslate[i].wCodePage);
149	ret = VerQueryValue(pVersionInfo, szFileVersionLocation, (LPVOID *)&lpszFileVersion, &cbFileVersion);
150	if (ret)
151	break;
152	}
153	if (i == cTranslationBlocks)
154	{
155	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: no file version found!\n");
156	goto end;
157	}
158
159	_snprintf(pModule->szFileVersion, sizeof(pModule->szFileVersion), "%s", lpszFileVersion);
160	pModule->szFileVersion[RT_ELEMENTS(pModule->szFileVersion) - 1] = 0;
161
162	unsigned idxRegion = 0;
163
164	if (fValidateMemory)
165	{
166	do
167	{
168	MEMORY_BASIC_INFORMATION MemInfo;
169
170	SIZE_T ret = VirtualQuery(pBaseAddress, &MemInfo, sizeof(MemInfo));
171	Assert(ret);
172	if (!ret)
173	{
174	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VirtualQueryEx failed with %d\n", GetLastError());
175	break;
176	}
177
178	if ( MemInfo.State == MEM_COMMIT
179	&& MemInfo.Type == MEM_IMAGE)
180	{
181	switch (MemInfo.Protect)
182	{
183	case PAGE_EXECUTE:
184	case PAGE_EXECUTE_READ:
185	case PAGE_READONLY:
186	{
187	char pRegion = (char )MemInfo.BaseAddress;
188
189	/* Skip the first region as it only contains the image file header. */
190	if (pRegion != (char *)pModule->Info.modBaseAddr)
191	{
192	/* Touch all pages. */
193	while (pRegion < (char *)MemInfo.BaseAddress + MemInfo.RegionSize)
194	{
195	/* Try to trick the optimizer to leave the page touching code in place. */
196	ASMProbeReadByte(pRegion);
197	pRegion += PAGE_SIZE;
198	}
199	}
200	#ifdef RT_ARCH_X86
201	aRegions[idxRegion].GCRegionAddr = (RTGCPTR32)MemInfo.BaseAddress;
202	#else
203	aRegions[idxRegion].GCRegionAddr = (RTGCPTR64)MemInfo.BaseAddress;
204	#endif
205	aRegions[idxRegion].cbRegion = MemInfo.RegionSize;
206	idxRegion++;
207
208	break;
209	}
210
211	default:
212	break; /* ignore */
213	}
214	}
215
216	pBaseAddress = (BYTE *)MemInfo.BaseAddress + MemInfo.RegionSize;
217	if (dwModuleSize > MemInfo.RegionSize)
218	{
219	dwModuleSize -= MemInfo.RegionSize;
220	}
221	else
222	{
223	dwModuleSize = 0;
224	break;
225	}
226
227	if (idxRegion >= RT_ELEMENTS(aRegions))
228	break; /* out of room */
229	}
230	while (dwModuleSize);
231	}
232	else
233	{
234	/* We can't probe kernel memory ranges, so pretend it's one big region. */
235	#ifdef RT_ARCH_X86
236	aRegions[idxRegion].GCRegionAddr = (RTGCPTR32)pBaseAddress;
237	#else
238	aRegions[idxRegion].GCRegionAddr = (RTGCPTR64)pBaseAddress;
239	#endif
240	aRegions[idxRegion].cbRegion = dwModuleSize;
241	idxRegion++;
242	}
243	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VbglR3RegisterSharedModule %s %s base=%p size=%x cregions=%d\n", pModule->Info.szModule, pModule->szFileVersion, pModule->Info.modBaseAddr, pModule->Info.modBaseSize, idxRegion);
244	#ifdef RT_ARCH_X86
245	int rc = VbglR3RegisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR32)pModule->Info.modBaseAddr,
246	pModule->Info.modBaseSize, idxRegion, aRegions);
247	#else
248	int rc = VbglR3RegisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR64)pModule->Info.modBaseAddr,
249	pModule->Info.modBaseSize, idxRegion, aRegions);
250	#endif
251
252	// AssertRC(rc);
253	if (RT_FAILURE(rc))
254	VBoxServiceVerbose(3, "VBoxServicePageSharingRegisterModule: VbglR3RegisterSharedModule failed with %d\n", rc);
255
256	end:
257	RTMemFree(pVersionInfo);
258	return;
259	}
260
261	/**
262	* Inspect all loaded modules for the specified process
263	* @param dwProcessId Process id
264	*/
265	void VBoxServicePageSharingInspectModules(DWORD dwProcessId, PAVLPVNODECORE *ppNewTree)
266	{
267	HANDLE hProcess, hSnapshot;
268
269	/* Get a list of all the modules in this process. */
270	hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,
271	FALSE /* no child process handle inheritance */, dwProcessId);
272	if (hProcess == NULL)
273	{
274	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules: OpenProcess %x failed with %d\n", dwProcessId, GetLastError());
275	return;
276	}
277
278	hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, dwProcessId);
279	if (hSnapshot == INVALID_HANDLE_VALUE)
280	{
281	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules: CreateToolhelp32Snapshot failed with %d\n", GetLastError());
282	CloseHandle(hProcess);
283	return;
284	}
285
286	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectModules\n");
287
288	MODULEENTRY32 ModuleInfo;
289	BOOL bRet;
290
291	ModuleInfo.dwSize = sizeof(ModuleInfo);
292	bRet = Module32First(hSnapshot, &ModuleInfo);
293	do
294	{
295	/** todo when changing this make sure VBoxService.exe is excluded! */
296	char *pszDot = strrchr(ModuleInfo.szModule, '.');
297	if ( pszDot
298	&& (pszDot[1] == 'e' \|\| pszDot[1] == 'E'))
299	continue; /* ignore executables for now. */
300
301	/* Found it before? */
302	PAVLPVNODECORE pRec = RTAvlPVGet(ppNewTree, ModuleInfo.modBaseAddr);
303	if (!pRec)
304	{
305	pRec = RTAvlPVRemove(&g_pKnownModuleTree, ModuleInfo.modBaseAddr);
306	if (!pRec)
307	{
308	/* New module; register it. */
309	PKNOWN_MODULE pModule = (PKNOWN_MODULE)RTMemAllocZ(sizeof(*pModule));
310	Assert(pModule);
311	if (!pModule)
312	break;
313
314	pModule->Info = ModuleInfo;
315	pModule->Core.Key = ModuleInfo.modBaseAddr;
316	pModule->hModule = LoadLibraryEx(ModuleInfo.szExePath, 0, DONT_RESOLVE_DLL_REFERENCES);
317	if (pModule->hModule)
318	VBoxServicePageSharingRegisterModule(pModule, true /* validate pages */);
319
320	VBoxServiceVerbose(3, "\n\n MODULE NAME: %s", ModuleInfo.szModule );
321	VBoxServiceVerbose(3, "\n executable = %s", ModuleInfo.szExePath );
322	VBoxServiceVerbose(3, "\n process ID = 0x%08X", ModuleInfo.th32ProcessID );
323	VBoxServiceVerbose(3, "\n base address = 0x%08X", (DWORD) ModuleInfo.modBaseAddr );
324	VBoxServiceVerbose(3, "\n base size = %d", ModuleInfo.modBaseSize );
325
326	pRec = &pModule->Core;
327	}
328	bool ret = RTAvlPVInsert(ppNewTree, pRec);
329	Assert(ret); NOREF(ret);
330	}
331	}
332	while (Module32Next(hSnapshot, &ModuleInfo));
333
334	CloseHandle(hSnapshot);
335	CloseHandle(hProcess);
336	}
337
338	/**
339	* Inspect all running processes for executables and dlls that might be worth sharing
340	* with other VMs.
341	*
342	*/
343	void VBoxServicePageSharingInspectGuest()
344	{
345	HANDLE hSnapshot;
346	PAVLPVNODECORE pNewTree = NULL;
347	DWORD dwProcessId = GetCurrentProcessId();
348
349	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectGuest\n");
350
351	hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
352	if (hSnapshot == INVALID_HANDLE_VALUE)
353	{
354	VBoxServiceVerbose(3, "VBoxServicePageSharingInspectGuest: 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(&g_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(&g_pKnownModuleTree, VBoxServicePageSharingEmptyTreeCallback, NULL);
488
489	/* Check all registered modules. */
490	VbglR3CheckSharedModules();
491
492	/* Activate new module tree. */
493	g_pKnownModuleTree = pNewTree;
494	}
495
496	/**
497	* RTAvlPVDestroy callback.
498	*/
499	static DECLCALLBACK(int) VBoxServicePageSharingEmptyTreeCallback(PAVLPVNODECORE pNode, void *pvUser)
500	{
501	PKNOWN_MODULE pModule = (PKNOWN_MODULE)pNode;
502	bool pfUnregister = (bool )pvUser;
503
504	VBoxServiceVerbose(3, "VBoxServicePageSharingEmptyTreeCallback %s %s\n", pModule->Info.szModule, pModule->szFileVersion);
505
506	/* Dereference module in the hypervisor. */
507	if ( !pfUnregister
508	\|\| *pfUnregister == true)
509	{
510	#ifdef RT_ARCH_X86
511	int rc = VbglR3UnregisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR32)pModule->Info.modBaseAddr, pModule->Info.modBaseSize);
512	#else
513	int rc = VbglR3UnregisterSharedModule(pModule->Info.szModule, pModule->szFileVersion, (RTGCPTR64)pModule->Info.modBaseAddr, pModule->Info.modBaseSize);
514	#endif
515	AssertRC(rc);
516	}
517
518	if (pModule->hModule)
519	FreeLibrary(pModule->hModule);
520	RTMemFree(pNode);
521	return 0;
522	}
523
524
525	#elif TARGET_NT4
526	void VBoxServicePageSharingInspectGuest()
527	{
528	/* not implemented */
529	}
530	#else
531	void VBoxServicePageSharingInspectGuest()
532	{
533	/* @todo other platforms */
534	}
535	#endif
536
537	/** @copydoc VBOXSERVICE::pfnPreInit */
538	static DECLCALLBACK(int) VBoxServicePageSharingPreInit(void)
539	{
540	return VINF_SUCCESS;
541	}
542
543
544	/** @copydoc VBOXSERVICE::pfnOption */
545	static DECLCALLBACK(int) VBoxServicePageSharingOption(const char ppszShort, int argc, char argv, int *pi)
546	{
547	NOREF(ppszShort);
548	NOREF(argc);
549	NOREF(argv);
550	NOREF(pi);
551	return VINF_SUCCESS;
552	}
553
554
555	/** @copydoc VBOXSERVICE::pfnInit */
556	static DECLCALLBACK(int) VBoxServicePageSharingInit(void)
557	{
558	VBoxServiceVerbose(3, "VBoxServicePageSharingInit\n");
559
560	int rc = RTSemEventMultiCreate(&g_PageSharingEvent);
561	AssertRCReturn(rc, rc);
562
563	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
564	hNtdll = LoadLibrary("ntdll.dll");
565
566	if (hNtdll)
567	ZwQuerySystemInformation = (PFNZWQUERYSYSTEMINFORMATION)GetProcAddress(hNtdll, "ZwQuerySystemInformation");
568
569	rc = VbglR3GetSessionId(&g_idSession);
570	AssertRCReturn(rc, rc);
571	#endif
572
573	/* Never fail here. */
574	return VINF_SUCCESS;
575	}
576
577	/** @copydoc VBOXSERVICE::pfnWorker */
578	DECLCALLBACK(int) VBoxServicePageSharingWorker(bool volatile *pfShutdown)
579	{
580	/*
581	* Tell the control thread that it can continue
582	* spawning services.
583	*/
584	RTThreadUserSignal(RTThreadSelf());
585
586	/*
587	* Now enter the loop retrieving runtime data continuously.
588	*/
589	for (;;)
590	{
591	uint64_t idNewSession;
592	BOOL fEnabled = VbglR3PageSharingIsEnabled();
593
594	VBoxServiceVerbose(3, "VBoxServicePageSharingWorker: enabled=%d\n", fEnabled);
595
596	if (fEnabled)
597	VBoxServicePageSharingInspectGuest();
598
599	/*
600	* Block for a minute.
601	*
602	* The event semaphore takes care of ignoring interruptions and it
603	* allows us to implement service wakeup later.
604	*/
605	if (*pfShutdown)
606	break;
607	int rc = RTSemEventMultiWait(g_PageSharingEvent, 60000);
608	if (*pfShutdown)
609	break;
610	if (rc != VERR_TIMEOUT && RT_FAILURE(rc))
611	{
612	VBoxServiceError("VBoxServicePageSharingWorker: RTSemEventMultiWait failed; rc=%Rrc\n", rc);
613	break;
614	}
615	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
616	idNewSession = g_idSession;
617	rc = VbglR3GetSessionId(&idNewSession);
618	AssertRC(rc);
619
620	if (idNewSession != g_idSession)
621	{
622	bool fUnregister = false;
623
624	VBoxServiceVerbose(3, "VBoxServicePageSharingWorker: VM was restored!!\n");
625	/* The VM was restored, so reregister all modules the next time. */
626	RTAvlPVDestroy(&g_pKnownModuleTree, VBoxServicePageSharingEmptyTreeCallback, &fUnregister);
627	g_pKnownModuleTree = NULL;
628
629	g_idSession = idNewSession;
630	}
631	#endif
632	}
633
634	RTSemEventMultiDestroy(g_PageSharingEvent);
635	g_PageSharingEvent = NIL_RTSEMEVENTMULTI;
636
637	VBoxServiceVerbose(3, "VBoxServicePageSharingWorker: finished thread\n");
638	return 0;
639	}
640
641	#ifdef RT_OS_WINDOWS
642
643	/**
644	* This gets control when VBoxService is launched with -pagefusionfork by
645	* VBoxServicePageSharingWorkerProcess().
646	*
647	* @returns RTEXITCODE_SUCCESS.
648	*
649	* @remarks It won't normally return since the parent drops the shutdown hint
650	* via RTProcTerminate().
651	*/
652	RTEXITCODE VBoxServicePageSharingInitFork(void)
653	{
654	VBoxServiceVerbose(3, "VBoxServicePageSharingInitFork\n");
655
656	bool fShutdown = false;
657	VBoxServicePageSharingInit();
658	VBoxServicePageSharingWorker(&fShutdown);
659
660	return RTEXITCODE_SUCCESS;
661	}
662
663	/** @copydoc VBOXSERVICE::pfnWorker */
664	DECLCALLBACK(int) VBoxServicePageSharingWorkerProcess(bool volatile *pfShutdown)
665	{
666	RTPROCESS hProcess = NIL_RTPROCESS;
667	int rc;
668
669	/*
670	* Tell the control thread that it can continue
671	* spawning services.
672	*/
673	RTThreadUserSignal(RTThreadSelf());
674
675	/*
676	* Now enter the loop retrieving runtime data continuously.
677	*/
678	for (;;)
679	{
680	BOOL fEnabled = VbglR3PageSharingIsEnabled();
681	VBoxServiceVerbose(3, "VBoxServicePageSharingWorkerProcess: enabled=%d\n", fEnabled);
682
683	/*
684	* Start a 2nd VBoxService process to deal with page fusion as we do
685	* not wish to dummy load dlls into this process. (First load with
686	* DONT_RESOLVE_DLL_REFERENCES, 2nd normal -> dll init routines not called!)
687	*/
688	if ( fEnabled
689	&& hProcess == NIL_RTPROCESS)
690	{
691	char szExeName[256];
692	char *pszExeName = RTProcGetExecutablePath(szExeName, sizeof(szExeName));
693	if (pszExeName)
694	{
695	char const *papszArgs[3];
696	papszArgs[0] = pszExeName;
697	papszArgs[1] = "--pagefusionfork";
698	papszArgs[2] = NULL;
699	rc = RTProcCreate(pszExeName, papszArgs, RTENV_DEFAULT, 0 /* normal child */, &hProcess);
700	if (RT_FAILURE(rc))
701	VBoxServiceError("VBoxServicePageSharingWorkerProcess: RTProcCreate %s failed; rc=%Rrc\n", pszExeName, rc);
702	}
703	}
704
705	/*
706	* Block for a minute.
707	*
708	* The event semaphore takes care of ignoring interruptions and it
709	* allows us to implement service wakeup later.
710	*/
711	if (*pfShutdown)
712	break;
713	rc = RTSemEventMultiWait(g_PageSharingEvent, 60000);
714	if (*pfShutdown)
715	break;
716	if (rc != VERR_TIMEOUT && RT_FAILURE(rc))
717	{
718	VBoxServiceError("VBoxServicePageSharingWorkerProcess: RTSemEventMultiWait failed; rc=%Rrc\n", rc);
719	break;
720	}
721	}
722
723	if (hProcess != NIL_RTPROCESS)
724	RTProcTerminate(hProcess);
725
726	RTSemEventMultiDestroy(g_PageSharingEvent);
727	g_PageSharingEvent = NIL_RTSEMEVENTMULTI;
728
729	VBoxServiceVerbose(3, "VBoxServicePageSharingWorkerProcess: finished thread\n");
730	return 0;
731	}
732
733	#endif /* RT_OS_WINDOWS */
734
735	/** @copydoc VBOXSERVICE::pfnTerm */
736	static DECLCALLBACK(void) VBoxServicePageSharingTerm(void)
737	{
738	VBoxServiceVerbose(3, "VBoxServicePageSharingTerm\n");
739
740	#if defined(RT_OS_WINDOWS) && !defined(TARGET_NT4)
741	if (hNtdll)
742	FreeLibrary(hNtdll);
743	#endif
744	return;
745	}
746
747
748	/** @copydoc VBOXSERVICE::pfnStop */
749	static DECLCALLBACK(void) VBoxServicePageSharingStop(void)
750	{
751	RTSemEventMultiSignal(g_PageSharingEvent);
752	}
753
754
755	/**
756	* The 'pagesharing' service description.
757	*/
758	VBOXSERVICE g_PageSharing =
759	{
760	/* pszName. */
761	"pagesharing",
762	/* pszDescription. */
763	"Page Sharing",
764	/* pszUsage. */
765	NULL,
766	/* pszOptions. */
767	NULL,
768	/* methods */
769	VBoxServicePageSharingPreInit,
770	VBoxServicePageSharingOption,
771	VBoxServicePageSharingInit,
772	#ifdef RT_OS_WINDOWS
773	VBoxServicePageSharingWorkerProcess,
774	#else
775	VBoxServicePageSharingWorker,
776	#endif
777	VBoxServicePageSharingStop,
778	VBoxServicePageSharingTerm
779	};

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServicePageSharing.cpp@ 34079

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