CSAM.cpp@ 53349

Last change on this file since 53349 was 52771, checked in by vboxsync, 10 years ago
VMM/CSAM, PATM: rename SSM_VERSION macros to SAVED_STATE_VERSION macros.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
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1	/* $Id: CSAM.cpp 52771 2014-09-17 11:32:33Z vboxsync $ */
2	/** @file
3	* CSAM - Guest OS Code Scanning and Analysis Manager
4	*/
5
6	/*
7	* Copyright (C) 2006-2014 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	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_CSAM
22	#include <VBox/vmm/cpum.h>
23	#include <VBox/vmm/stam.h>
24	#include <VBox/vmm/patm.h>
25	#include <VBox/vmm/csam.h>
26	#include <VBox/vmm/cpumdis.h>
27	#include <VBox/vmm/pgm.h>
28	#include <VBox/vmm/iom.h>
29	#include <VBox/vmm/mm.h>
30	#include <VBox/vmm/em.h>
31	#include <VBox/vmm/hm.h>
32	#ifdef VBOX_WITH_REM
33	# include <VBox/vmm/rem.h>
34	#endif
35	#include <VBox/vmm/selm.h>
36	#include <VBox/vmm/trpm.h>
37	#include <VBox/vmm/cfgm.h>
38	#include <VBox/vmm/ssm.h>
39	#include <VBox/param.h>
40	#include <iprt/avl.h>
41	#include <iprt/asm.h>
42	#include <iprt/thread.h>
43	#include "CSAMInternal.h"
44	#include <VBox/vmm/vm.h>
45	#include <VBox/vmm/uvm.h>
46
47	#include <VBox/dbg.h>
48	#include <VBox/sup.h>
49	#include <VBox/err.h>
50	#include <VBox/log.h>
51
52	#include <VBox/dis.h>
53	#include <VBox/disopcode.h>
54	#include <iprt/assert.h>
55	#include <iprt/string.h>
56	#include "internal/pgm.h"
57
58
59	/* Enabled by default */
60	#define CSAM_ENABLE
61
62	/* Enable to monitor code pages for self-modifying code. */
63	#define CSAM_MONITOR_CODE_PAGES
64	/* Enable to monitor all scanned pages
65	#define CSAM_MONITOR_CSAM_CODE_PAGES */
66	/* Enable to scan beyond ret instructions.
67	#define CSAM_ANALYSE_BEYOND_RET */
68
69	/*******************************************************************************
70	* Internal Functions *
71	*******************************************************************************/
72	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM);
73	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
74	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
75	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr);
76
77	bool csamIsCodeScanned(PVM pVM, RTRCPTR pInstr, PCSAMPAGE *pPage);
78	int csamR3CheckPageRecord(PVM pVM, RTRCPTR pInstr);
79	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTRCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
80	static int csamRemovePageRecord(PVM pVM, RTRCPTR GCPtr);
81	static int csamReinit(PVM pVM);
82	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTRCPTR pInstr, uint32_t opsize, bool fScanned);
83	static int csamAnalyseCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
84	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec);
85
86	/** @todo Temporary for debugging. */
87	static bool fInCSAMCodePageInvalidate = false;
88
89	#ifdef VBOX_WITH_DEBUGGER
90	static FNDBGCCMD csamr3CmdOn;
91	static FNDBGCCMD csamr3CmdOff;
92	#endif
93
94
95	/*******************************************************************************
96	* Global Variables *
97	*******************************************************************************/
98	#ifdef VBOX_WITH_DEBUGGER
99	/** Command descriptors. */
100	static const DBGCCMD g_aCmds[] =
101	{
102	/* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, fFlags, pfnHandler pszSyntax, ....pszDescription */
103	{ "csamon", 0, 0, NULL, 0, 0, csamr3CmdOn, "", "Enable CSAM code scanning." },
104	{ "csamoff", 0, 0, NULL, 0, 0, csamr3CmdOff, "", "Disable CSAM code scanning." },
105	};
106	#endif
107
108	/**
109	* SSM descriptor table for the CSAM structure.
110	*/
111	static const SSMFIELD g_aCsamFields[] =
112	{
113	/** @todo there are more fields that can be ignored here. */
114	SSMFIELD_ENTRY_IGNORE( CSAM, offVM),
115	SSMFIELD_ENTRY_PAD_HC64( CSAM, Alignment0, sizeof(uint32_t)),
116	SSMFIELD_ENTRY_IGN_HCPTR( CSAM, pPageTree),
117	SSMFIELD_ENTRY( CSAM, aDangerousInstr),
118	SSMFIELD_ENTRY( CSAM, cDangerousInstr),
119	SSMFIELD_ENTRY( CSAM, iDangerousInstr),
120	SSMFIELD_ENTRY_RCPTR( CSAM, pPDBitmapGC), /// @todo ignore this?
121	SSMFIELD_ENTRY_RCPTR( CSAM, pPDHCBitmapGC), /// @todo ignore this?
122	SSMFIELD_ENTRY_IGN_HCPTR( CSAM, pPDBitmapHC),
123	SSMFIELD_ENTRY_IGN_HCPTR( CSAM, pPDGCBitmapHC),
124	SSMFIELD_ENTRY_IGN_HCPTR( CSAM, savedstate.pSSM),
125	SSMFIELD_ENTRY( CSAM, savedstate.cPageRecords),
126	SSMFIELD_ENTRY( CSAM, savedstate.cPatchPageRecords),
127	SSMFIELD_ENTRY( CSAM, cDirtyPages),
128	SSMFIELD_ENTRY_RCPTR_ARRAY( CSAM, pvDirtyBasePage),
129	SSMFIELD_ENTRY_RCPTR_ARRAY( CSAM, pvDirtyFaultPage),
130	SSMFIELD_ENTRY( CSAM, cPossibleCodePages),
131	SSMFIELD_ENTRY_RCPTR_ARRAY( CSAM, pvPossibleCodePage),
132	SSMFIELD_ENTRY_RCPTR_ARRAY( CSAM, pvCallInstruction),
133	SSMFIELD_ENTRY( CSAM, iCallInstruction),
134	SSMFIELD_ENTRY( CSAM, fScanningStarted),
135	SSMFIELD_ENTRY( CSAM, fGatesChecked),
136	SSMFIELD_ENTRY_PAD_HC( CSAM, Alignment1, 6, 2),
137	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrTraps),
138	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrPages),
139	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrPagesInv),
140	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrRemovedPages),
141	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrPatchPages),
142	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrPageNPHC),
143	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrPageNPGC),
144	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrFlushes),
145	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrFlushesSkipped),
146	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrKnownPagesHC),
147	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrKnownPagesGC),
148	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrInstr),
149	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrBytesRead),
150	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrOpcodeRead),
151	SSMFIELD_ENTRY_IGNORE( CSAM, StatTime),
152	SSMFIELD_ENTRY_IGNORE( CSAM, StatTimeCheckAddr),
153	SSMFIELD_ENTRY_IGNORE( CSAM, StatTimeAddrConv),
154	SSMFIELD_ENTRY_IGNORE( CSAM, StatTimeFlushPage),
155	SSMFIELD_ENTRY_IGNORE( CSAM, StatTimeDisasm),
156	SSMFIELD_ENTRY_IGNORE( CSAM, StatFlushDirtyPages),
157	SSMFIELD_ENTRY_IGNORE( CSAM, StatCheckGates),
158	SSMFIELD_ENTRY_IGNORE( CSAM, StatCodePageModified),
159	SSMFIELD_ENTRY_IGNORE( CSAM, StatDangerousWrite),
160	SSMFIELD_ENTRY_IGNORE( CSAM, StatInstrCacheHit),
161	SSMFIELD_ENTRY_IGNORE( CSAM, StatInstrCacheMiss),
162	SSMFIELD_ENTRY_IGNORE( CSAM, StatPagePATM),
163	SSMFIELD_ENTRY_IGNORE( CSAM, StatPageCSAM),
164	SSMFIELD_ENTRY_IGNORE( CSAM, StatPageREM),
165	SSMFIELD_ENTRY_IGNORE( CSAM, StatNrUserPages),
166	SSMFIELD_ENTRY_IGNORE( CSAM, StatPageMonitor),
167	SSMFIELD_ENTRY_IGNORE( CSAM, StatPageRemoveREMFlush),
168	SSMFIELD_ENTRY_IGNORE( CSAM, StatBitmapAlloc),
169	SSMFIELD_ENTRY_IGNORE( CSAM, StatScanNextFunction),
170	SSMFIELD_ENTRY_IGNORE( CSAM, StatScanNextFunctionFailed),
171	SSMFIELD_ENTRY_TERM()
172	};
173
174	/** Fake type to simplify g_aCsamPDBitmapArray construction. */
175	typedef struct
176	{
177	uint8_t *a[CSAM_PGDIRBMP_CHUNKS];
178	} CSAMPDBITMAPARRAY;
179
180	/**
181	* SSM descriptor table for the CSAM::pPDBitmapHC array.
182	*/
183	static SSMFIELD const g_aCsamPDBitmapArray[] =
184	{
185	SSMFIELD_ENTRY_HCPTR_NI_ARRAY(CSAMPDBITMAPARRAY, a),
186	SSMFIELD_ENTRY_TERM()
187	};
188
189	/**
190	* SSM descriptor table for the CSAMPAGEREC structure.
191	*/
192	static const SSMFIELD g_aCsamPageRecFields[] =
193	{
194	SSMFIELD_ENTRY_IGN_HCPTR( CSAMPAGEREC, Core.Key),
195	SSMFIELD_ENTRY_IGN_HCPTR( CSAMPAGEREC, Core.pLeft),
196	SSMFIELD_ENTRY_IGN_HCPTR( CSAMPAGEREC, Core.pRight),
197	SSMFIELD_ENTRY_IGNORE( CSAMPAGEREC, Core.uchHeight),
198	SSMFIELD_ENTRY_PAD_HC_AUTO( 3, 7),
199	SSMFIELD_ENTRY_RCPTR( CSAMPAGEREC, page.pPageGC),
200	SSMFIELD_ENTRY_PAD_HC_AUTO( 0, 4),
201	SSMFIELD_ENTRY_PAD_MSC32_AUTO( 4),
202	SSMFIELD_ENTRY_GCPHYS( CSAMPAGEREC, page.GCPhys),
203	SSMFIELD_ENTRY( CSAMPAGEREC, page.fFlags),
204	SSMFIELD_ENTRY( CSAMPAGEREC, page.uSize),
205	SSMFIELD_ENTRY_PAD_HC_AUTO( 0, 4),
206	SSMFIELD_ENTRY_HCPTR_NI( CSAMPAGEREC, page.pBitmap),
207	SSMFIELD_ENTRY( CSAMPAGEREC, page.fCode32),
208	SSMFIELD_ENTRY( CSAMPAGEREC, page.fMonitorActive),
209	SSMFIELD_ENTRY( CSAMPAGEREC, page.fMonitorInvalidation),
210	SSMFIELD_ENTRY_PAD_HC_AUTO( 1, 1),
211	SSMFIELD_ENTRY( CSAMPAGEREC, page.enmTag),
212	SSMFIELD_ENTRY( CSAMPAGEREC, page.u64Hash),
213	SSMFIELD_ENTRY_TERM()
214	};
215
216
217	/**
218	* Initializes the CSAM.
219	*
220	* @returns VBox status code.
221	* @param pVM Pointer to the VM.
222	*/
223	VMMR3_INT_DECL(int) CSAMR3Init(PVM pVM)
224	{
225	int rc;
226
227	/*
228	* We only need a saved state dummy loader if HM is enabled.
229	*/
230	if (HMIsEnabled(pVM))
231	{
232	pVM->fCSAMEnabled = false;
233	return SSMR3RegisterStub(pVM, "CSAM", 0);
234	}
235
236	/*
237	* Raw-mode.
238	*/
239	LogFlow(("CSAMR3Init\n"));
240
241	/* Allocate bitmap for the page directory. */
242	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTHCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDBitmapHC);
243	AssertRCReturn(rc, rc);
244	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTRCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDGCBitmapHC);
245	AssertRCReturn(rc, rc);
246	pVM->csam.s.pPDBitmapGC = MMHyperR3ToRC(pVM, pVM->csam.s.pPDGCBitmapHC);
247	pVM->csam.s.pPDHCBitmapGC = MMHyperR3ToRC(pVM, pVM->csam.s.pPDBitmapHC);
248
249	rc = csamReinit(pVM);
250	AssertRCReturn(rc, rc);
251
252	/*
253	* Register save and load state notifiers.
254	*/
255	rc = SSMR3RegisterInternal(pVM, "CSAM", 0, CSAM_SAVED_STATE_VERSION, sizeof(pVM->csam.s) + PAGE_SIZE*16,
256	NULL, NULL, NULL,
257	NULL, csamr3Save, NULL,
258	NULL, csamr3Load, NULL);
259	AssertRCReturn(rc, rc);
260
261	STAM_REG(pVM, &pVM->csam.s.StatNrTraps, STAMTYPE_COUNTER, "/CSAM/PageTraps", STAMUNIT_OCCURENCES, "The number of CSAM page traps.");
262	STAM_REG(pVM, &pVM->csam.s.StatDangerousWrite, STAMTYPE_COUNTER, "/CSAM/DangerousWrites", STAMUNIT_OCCURENCES, "The number of dangerous writes that cause a context switch.");
263
264	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPHC, STAMTYPE_COUNTER, "/CSAM/HC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
265	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPGC, STAMTYPE_COUNTER, "/CSAM/GC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
266	STAM_REG(pVM, &pVM->csam.s.StatNrPages, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRW", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW monitoring).");
267	STAM_REG(pVM, &pVM->csam.s.StatNrPagesInv, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRWI", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW & invalidation monitoring).");
268	STAM_REG(pVM, &pVM->csam.s.StatNrRemovedPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Removed", STAMUNIT_OCCURENCES, "The number of removed CSAM page records.");
269	STAM_REG(pVM, &pVM->csam.s.StatPageRemoveREMFlush,STAMTYPE_COUNTER, "/CSAM/PageRec/Removed/REMFlush", STAMUNIT_OCCURENCES, "The number of removed CSAM page records that caused a REM flush.");
270
271	STAM_REG(pVM, &pVM->csam.s.StatNrPatchPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Patch", STAMUNIT_OCCURENCES, "The number of CSAM patch page records.");
272	STAM_REG(pVM, &pVM->csam.s.StatNrUserPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Ignore/User", STAMUNIT_OCCURENCES, "The number of CSAM user page records (ignored).");
273	STAM_REG(pVM, &pVM->csam.s.StatPagePATM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/PATM", STAMUNIT_OCCURENCES, "The number of PATM page records.");
274	STAM_REG(pVM, &pVM->csam.s.StatPageCSAM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/CSAM", STAMUNIT_OCCURENCES, "The number of CSAM page records.");
275	STAM_REG(pVM, &pVM->csam.s.StatPageREM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/REM", STAMUNIT_OCCURENCES, "The number of REM page records.");
276	STAM_REG(pVM, &pVM->csam.s.StatPageMonitor, STAMTYPE_COUNTER, "/CSAM/PageRec/Monitored", STAMUNIT_OCCURENCES, "The number of monitored pages.");
277
278	STAM_REG(pVM, &pVM->csam.s.StatCodePageModified, STAMTYPE_COUNTER, "/CSAM/Monitor/DirtyPage", STAMUNIT_OCCURENCES, "The number of code page modifications.");
279
280	STAM_REG(pVM, &pVM->csam.s.StatNrFlushes, STAMTYPE_COUNTER, "/CSAM/PageFlushes", STAMUNIT_OCCURENCES, "The number of CSAM page flushes.");
281	STAM_REG(pVM, &pVM->csam.s.StatNrFlushesSkipped, STAMTYPE_COUNTER, "/CSAM/PageFlushesSkipped", STAMUNIT_OCCURENCES, "The number of CSAM page flushes that were skipped.");
282	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesHC, STAMTYPE_COUNTER, "/CSAM/HC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
283	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesGC, STAMTYPE_COUNTER, "/CSAM/GC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
284	STAM_REG(pVM, &pVM->csam.s.StatNrInstr, STAMTYPE_COUNTER, "/CSAM/ScannedInstr", STAMUNIT_OCCURENCES, "The number of scanned instructions.");
285	STAM_REG(pVM, &pVM->csam.s.StatNrBytesRead, STAMTYPE_COUNTER, "/CSAM/BytesRead", STAMUNIT_OCCURENCES, "The number of bytes read for scanning.");
286	STAM_REG(pVM, &pVM->csam.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/CSAM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
287
288	STAM_REG(pVM, &pVM->csam.s.StatBitmapAlloc, STAMTYPE_COUNTER, "/CSAM/Alloc/PageBitmap", STAMUNIT_OCCURENCES, "The number of page bitmap allocations.");
289
290	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheHit, STAMTYPE_COUNTER, "/CSAM/Cache/Hit", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache hits.");
291	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheMiss, STAMTYPE_COUNTER, "/CSAM/Cache/Miss", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache misses.");
292
293	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunction, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Success", STAMUNIT_OCCURENCES, "The number of found functions beyond the ret border.");
294	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunctionFailed, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Failed", STAMUNIT_OCCURENCES, "The number of refused functions beyond the ret border.");
295
296	STAM_REG(pVM, &pVM->csam.s.StatTime, STAMTYPE_PROFILE, "/PROF/CSAM/Scan", STAMUNIT_TICKS_PER_CALL, "Scanning overhead.");
297	STAM_REG(pVM, &pVM->csam.s.StatTimeCheckAddr, STAMTYPE_PROFILE, "/PROF/CSAM/CheckAddr", STAMUNIT_TICKS_PER_CALL, "Address check overhead.");
298	STAM_REG(pVM, &pVM->csam.s.StatTimeAddrConv, STAMTYPE_PROFILE, "/PROF/CSAM/AddrConv", STAMUNIT_TICKS_PER_CALL, "Address conversion overhead.");
299	STAM_REG(pVM, &pVM->csam.s.StatTimeFlushPage, STAMTYPE_PROFILE, "/PROF/CSAM/FlushPage", STAMUNIT_TICKS_PER_CALL, "Page flushing overhead.");
300	STAM_REG(pVM, &pVM->csam.s.StatTimeDisasm, STAMTYPE_PROFILE, "/PROF/CSAM/Disasm", STAMUNIT_TICKS_PER_CALL, "Disassembly overhead.");
301	STAM_REG(pVM, &pVM->csam.s.StatFlushDirtyPages, STAMTYPE_PROFILE, "/PROF/CSAM/FlushDirtyPage", STAMUNIT_TICKS_PER_CALL, "Dirty page flushing overhead.");
302	STAM_REG(pVM, &pVM->csam.s.StatCheckGates, STAMTYPE_PROFILE, "/PROF/CSAM/CheckGates", STAMUNIT_TICKS_PER_CALL, "CSAMR3CheckGates overhead.");
303
304	/*
305	* Check CFGM option and enable/disable CSAM.
306	*/
307	bool fEnabled;
308	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "CSAMEnabled", &fEnabled);
309	if (RT_FAILURE(rc))
310	#ifdef CSAM_ENABLE
311	fEnabled = true;
312	#else
313	fEnabled = false;
314	#endif
315	if (fEnabled)
316	CSAMEnableScanning(pVM);
317
318	#ifdef VBOX_WITH_DEBUGGER
319	/*
320	* Debugger commands.
321	*/
322	static bool fRegisteredCmds = false;
323	if (!fRegisteredCmds)
324	{
325	rc = DBGCRegisterCommands(&g_aCmds[0], RT_ELEMENTS(g_aCmds));
326	if (RT_SUCCESS(rc))
327	fRegisteredCmds = true;
328	}
329	#endif
330
331	return VINF_SUCCESS;
332	}
333
334	/**
335	* (Re)initializes CSAM
336	*
337	* @param pVM The VM.
338	*/
339	static int csamReinit(PVM pVM)
340	{
341	/*
342	* Assert alignment and sizes.
343	*/
344	AssertRelease(!(RT_OFFSETOF(VM, csam.s) & 31));
345	AssertRelease(sizeof(pVM->csam.s) <= sizeof(pVM->csam.padding));
346	AssertRelease(!HMIsEnabled(pVM));
347
348	/*
349	* Setup any fixed pointers and offsets.
350	*/
351	pVM->csam.s.offVM = RT_OFFSETOF(VM, patm);
352
353	pVM->csam.s.fGatesChecked = false;
354	pVM->csam.s.fScanningStarted = false;
355
356	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies 1 VPCU */
357	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_CSAM_PENDING_ACTION);
358	pVM->csam.s.cDirtyPages = 0;
359	/* not necessary */
360	memset(pVM->csam.s.pvDirtyBasePage, 0, sizeof(pVM->csam.s.pvDirtyBasePage));
361	memset(pVM->csam.s.pvDirtyFaultPage, 0, sizeof(pVM->csam.s.pvDirtyFaultPage));
362
363	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
364	pVM->csam.s.cDangerousInstr = 0;
365	pVM->csam.s.iDangerousInstr = 0;
366
367	memset(pVM->csam.s.pvCallInstruction, 0, sizeof(pVM->csam.s.pvCallInstruction));
368	pVM->csam.s.iCallInstruction = 0;
369
370	/** @note never mess with the pgdir bitmap here! */
371	return VINF_SUCCESS;
372	}
373
374	/**
375	* Applies relocations to data and code managed by this
376	* component. This function will be called at init and
377	* whenever the VMM need to relocate itself inside the GC.
378	*
379	* The csam will update the addresses used by the switcher.
380	*
381	* @param pVM The VM.
382	* @param offDelta Relocation delta.
383	*/
384	VMMR3_INT_DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
385	{
386	if (offDelta && !HMIsEnabled(pVM))
387	{
388	/* Adjust pgdir and page bitmap pointers. */
389	pVM->csam.s.pPDBitmapGC = MMHyperR3ToRC(pVM, pVM->csam.s.pPDGCBitmapHC);
390	pVM->csam.s.pPDHCBitmapGC = MMHyperR3ToRC(pVM, pVM->csam.s.pPDBitmapHC);
391
392	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
393	{
394	if (pVM->csam.s.pPDGCBitmapHC[i])
395	{
396	pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
397	}
398	}
399	}
400	return;
401	}
402
403	/**
404	* Terminates the csam.
405	*
406	* Termination means cleaning up and freeing all resources,
407	* the VM it self is at this point powered off or suspended.
408	*
409	* @returns VBox status code.
410	* @param pVM Pointer to the VM.
411	*/
412	VMMR3_INT_DECL(int) CSAMR3Term(PVM pVM)
413	{
414	if (HMIsEnabled(pVM))
415	return VINF_SUCCESS;
416
417	int rc;
418
419	rc = CSAMR3Reset(pVM);
420	AssertRC(rc);
421
422	/* @todo triggers assertion in MMHyperFree */
423	#if 0
424	for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
425	{
426	if (pVM->csam.s.pPDBitmapHC[i])
427	MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
428	}
429	#endif
430
431	return VINF_SUCCESS;
432	}
433
434	/**
435	* CSAM reset callback.
436	*
437	* @returns VBox status code.
438	* @param pVM The VM which is reset.
439	*/
440	VMMR3_INT_DECL(int) CSAMR3Reset(PVM pVM)
441	{
442	if (HMIsEnabled(pVM))
443	return VINF_SUCCESS;
444
445	/* Clear page bitmaps. */
446	for (int i = 0; i < CSAM_PGDIRBMP_CHUNKS; i++)
447	{
448	if (pVM->csam.s.pPDBitmapHC[i])
449	{
450	Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
451	ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
452	}
453	}
454
455	/* Remove all CSAM page records. */
456	for (;;)
457	{
458	PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
459	if (!pPageRec)
460	break;
461	csamRemovePageRecord(pVM, pPageRec->page.pPageGC);
462	}
463	Assert(!pVM->csam.s.pPageTree);
464
465	csamReinit(pVM);
466
467	return VINF_SUCCESS;
468	}
469
470
471	/**
472	* Callback function for RTAvlPVDoWithAll
473	*
474	* Counts the number of records in the tree
475	*
476	* @returns VBox status code.
477	* @param pNode Current node
478	* @param pcPatches Pointer to patch counter
479	*/
480	static DECLCALLBACK(int) CountRecord(PAVLPVNODECORE pNode, void *pcPatches)
481	{
482	NOREF(pNode);
483	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
484	return VINF_SUCCESS;
485	}
486
487	/**
488	* Callback function for RTAvlPVDoWithAll
489	*
490	* Saves the state of the page record
491	*
492	* @returns VBox status code.
493	* @param pNode Current node
494	* @param pVM1 Pointer to the VM
495	*/
496	static DECLCALLBACK(int) SavePageState(PAVLPVNODECORE pNode, void *pVM1)
497	{
498	PVM pVM = (PVM)pVM1;
499	PCSAMPAGEREC pPage = (PCSAMPAGEREC)pNode;
500	CSAMPAGEREC page = *pPage;
501	PSSMHANDLE pSSM = pVM->csam.s.savedstate.pSSM;
502	int rc;
503
504	/* Save the page record itself */
505	rc = SSMR3PutMem(pSSM, &page, sizeof(page));
506	AssertRCReturn(rc, rc);
507
508	if (page.page.pBitmap)
509	{
510	rc = SSMR3PutMem(pSSM, page.page.pBitmap, CSAM_PAGE_BITMAP_SIZE);
511	AssertRCReturn(rc, rc);
512	}
513
514	return VINF_SUCCESS;
515	}
516
517	/**
518	* Execute state save operation.
519	*
520	* @returns VBox status code.
521	* @param pVM Pointer to the VM.
522	* @param pSSM SSM operation handle.
523	*/
524	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM)
525	{
526	CSAM csamInfo = pVM->csam.s;
527	int rc;
528
529	/*
530	* Count the number of page records in the tree (feeling lazy)
531	*/
532	csamInfo.savedstate.cPageRecords = 0;
533	RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, CountRecord, &csamInfo.savedstate.cPageRecords);
534
535	/*
536	* Save CSAM structure
537	*/
538	pVM->csam.s.savedstate.pSSM = pSSM;
539	rc = SSMR3PutMem(pSSM, &csamInfo, sizeof(csamInfo));
540	AssertRCReturn(rc, rc);
541
542	/* Save pgdir bitmap */
543	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
544	AssertRCReturn(rc, rc);
545
546	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
547	{
548	if(csamInfo.pPDBitmapHC[i])
549	{
550	/* Save the page bitmap. */
551	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
552	AssertRCReturn(rc, rc);
553	}
554	}
555
556	/*
557	* Save page records
558	*/
559	rc = RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, SavePageState, pVM);
560	AssertRCReturn(rc, rc);
561
562	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
563	return VINF_SUCCESS;
564	}
565
566
567	/**
568	* Execute state load operation.
569	*
570	* @returns VBox status code.
571	* @param pVM Pointer to the VM.
572	* @param pSSM SSM operation handle.
573	* @param uVersion Data layout version.
574	* @param uPass The data pass.
575	*/
576	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
577	{
578	int rc;
579	CSAM csamInfo;
580
581	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
582	if (uVersion != CSAM_SAVED_STATE_VERSION)
583	{
584	AssertMsgFailed(("csamR3Load: Invalid version uVersion=%d!\n", uVersion));
585	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
586	}
587
588	pVM->csam.s.savedstate.pSSM = pSSM;
589
590	/*
591	* Restore CSAM structure
592	*/
593	RT_ZERO(csamInfo);
594	rc = SSMR3GetStructEx(pSSM, &csamInfo, sizeof(csamInfo), SSMSTRUCT_FLAGS_MEM_BAND_AID_RELAXED, &g_aCsamFields[0], NULL);
595	AssertRCReturn(rc, rc);
596
597	pVM->csam.s.fGatesChecked = csamInfo.fGatesChecked;
598	pVM->csam.s.fScanningStarted = csamInfo.fScanningStarted;
599
600	/* Restore dirty code page info. */
601	pVM->csam.s.cDirtyPages = csamInfo.cDirtyPages;
602	memcpy(pVM->csam.s.pvDirtyBasePage, csamInfo.pvDirtyBasePage, sizeof(pVM->csam.s.pvDirtyBasePage));
603	memcpy(pVM->csam.s.pvDirtyFaultPage, csamInfo.pvDirtyFaultPage, sizeof(pVM->csam.s.pvDirtyFaultPage));
604
605	/* Restore possible code page */
606	pVM->csam.s.cPossibleCodePages = csamInfo.cPossibleCodePages;
607	memcpy(pVM->csam.s.pvPossibleCodePage, csamInfo.pvPossibleCodePage, sizeof(pVM->csam.s.pvPossibleCodePage));
608
609	/* Restore pgdir bitmap (we'll change the pointers next). */
610	rc = SSMR3GetStructEx(pSSM, pVM->csam.s.pPDBitmapHC, sizeof(uint8_t ) CSAM_PGDIRBMP_CHUNKS,
611	SSMSTRUCT_FLAGS_MEM_BAND_AID_RELAXED, &g_aCsamPDBitmapArray[0], NULL);
612	AssertRCReturn(rc, rc);
613
614	/*
615	* Restore page bitmaps
616	*/
617	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
618	{
619	if(pVM->csam.s.pPDBitmapHC[i])
620	{
621	rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC[i]);
622	if (RT_FAILURE(rc))
623	{
624	Log(("MMHyperAlloc failed with %Rrc\n", rc));
625	return rc;
626	}
627	/* Convert to GC pointer. */
628	pVM->csam.s.pPDGCBitmapHC[i] = MMHyperR3ToRC(pVM, pVM->csam.s.pPDBitmapHC[i]);
629	Assert(pVM->csam.s.pPDGCBitmapHC[i]);
630
631	/* Restore the bitmap. */
632	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
633	AssertRCReturn(rc, rc);
634	}
635	else
636	{
637	Assert(!pVM->csam.s.pPDGCBitmapHC[i]);
638	pVM->csam.s.pPDGCBitmapHC[i] = 0;
639	}
640	}
641
642	/*
643	* Restore page records
644	*/
645	for (uint32_t i=0;i<csamInfo.savedstate.cPageRecords + csamInfo.savedstate.cPatchPageRecords;i++)
646	{
647	CSAMPAGEREC page;
648	PCSAMPAGE pPage;
649
650	RT_ZERO(page);
651	rc = SSMR3GetStructEx(pSSM, &page, sizeof(page), SSMSTRUCT_FLAGS_MEM_BAND_AID_RELAXED, &g_aCsamPageRecFields[0], NULL);
652	AssertRCReturn(rc, rc);
653
654	/*
655	* Recreate the page record
656	*/
657	pPage = csamCreatePageRecord(pVM, page.page.pPageGC, page.page.enmTag, page.page.fCode32, page.page.fMonitorInvalidation);
658	AssertReturn(pPage, VERR_NO_MEMORY);
659
660	pPage->GCPhys = page.page.GCPhys;
661	pPage->fFlags = page.page.fFlags;
662	pPage->u64Hash = page.page.u64Hash;
663
664	if (page.page.pBitmap)
665	{
666	rc = SSMR3GetMem(pSSM, pPage->pBitmap, CSAM_PAGE_BITMAP_SIZE);
667	AssertRCReturn(rc, rc);
668	}
669	else
670	{
671	MMR3HeapFree(pPage->pBitmap);
672	pPage->pBitmap = 0;
673	}
674	}
675
676	/* Note: we don't restore aDangerousInstr; it will be recreated automatically. */
677	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
678	pVM->csam.s.cDangerousInstr = 0;
679	pVM->csam.s.iDangerousInstr = 0;
680	return VINF_SUCCESS;
681	}
682
683	/**
684	* Convert guest context address to host context pointer
685	*
686	* @returns Byte pointer (ring-3 context) corresponding to pGCPtr on success,
687	* NULL on failure.
688	* @param pVM Pointer to the VM.
689	* @param pCacheRec Address conversion cache record
690	* @param pGCPtr Guest context pointer
691	* @returns Host context pointer or NULL in case of an error
692	*
693	*/
694	static uint8_t csamR3GCVirtToHCVirt(PVM pVM, PCSAMP2GLOOKUPREC pCacheRec, RCPTRTYPE(uint8_t ) pGCPtr)
695	{
696	int rc;
697	void *pHCPtr;
698	Assert(pVM->cCpus == 1);
699	PVMCPU pVCpu = VMMGetCpu0(pVM);
700
701	STAM_PROFILE_START(&pVM->csam.s.StatTimeAddrConv, a);
702
703	pHCPtr = PATMR3GCPtrToHCPtr(pVM, pGCPtr);
704	if (pHCPtr)
705	return (uint8_t *)pHCPtr;
706
707	if (pCacheRec->pPageLocStartHC)
708	{
709	uint32_t offset = pGCPtr & PAGE_OFFSET_MASK;
710	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
711	{
712	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
713	return pCacheRec->pPageLocStartHC + offset;
714	}
715	}
716
717	/* Release previous lock if any. */
718	if (pCacheRec->Lock.pvMap)
719	{
720	PGMPhysReleasePageMappingLock(pVM, &pCacheRec->Lock);
721	pCacheRec->Lock.pvMap = NULL;
722	}
723
724	rc = PGMPhysGCPtr2CCPtrReadOnly(pVCpu, pGCPtr, (const void **)&pHCPtr, &pCacheRec->Lock);
725	if (rc != VINF_SUCCESS)
726	{
727	//// AssertMsgRC(rc, ("MMR3PhysGCVirt2HCVirtEx failed for %RRv\n", pGCPtr));
728	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
729	return NULL;
730	}
731
732	pCacheRec->pPageLocStartHC = (uint8_t*)((uintptr_t)pHCPtr & PAGE_BASE_HC_MASK);
733	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
734	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
735	return (uint8_t *)pHCPtr;
736	}
737
738
739	/** For csamR3ReadBytes. */
740	typedef struct CSAMDISINFO
741	{
742	PVM pVM;
743	uint8_t const pbSrcInstr; / aka pInstHC */
744	} CSAMDISINFO, *PCSAMDISINFO;
745
746
747	/**
748	* @callback_method_impl{FNDISREADBYTES}
749	*/
750	static DECLCALLBACK(int) csamR3ReadBytes(PDISCPUSTATE pDis, uint8_t offInstr, uint8_t cbMinRead, uint8_t cbMaxRead)
751	{
752	PCSAMDISINFO pDisInfo = (PCSAMDISINFO)pDis->pvUser;
753
754	/*
755	* We are not interested in patched instructions, so read the original opcode bytes.
756	*
757	* Note! single instruction patches (int3) are checked in CSAMR3AnalyseCallback
758	*
759	* Since we're decoding one instruction at the time, we don't need to be
760	* concerned about any patched instructions following the first one. We
761	* could in fact probably skip this PATM call for offInstr != 0.
762	*/
763	size_t cbRead = cbMaxRead;
764	RTUINTPTR uSrcAddr = pDis->uInstrAddr + offInstr;
765	int rc = PATMR3ReadOrgInstr(pDisInfo->pVM, pDis->uInstrAddr + offInstr, &pDis->abInstr[offInstr], cbRead, &cbRead);
766	if (RT_SUCCESS(rc))
767	{
768	if (cbRead >= cbMinRead)
769	{
770	pDis->cbCachedInstr = offInstr + (uint8_t)cbRead;
771	return rc;
772	}
773
774	cbMinRead -= (uint8_t)cbRead;
775	cbMaxRead -= (uint8_t)cbRead;
776	offInstr += (uint8_t)cbRead;
777	uSrcAddr += cbRead;
778	}
779
780	/*
781	* The current byte isn't a patch instruction byte.
782	*/
783	AssertPtr(pDisInfo->pbSrcInstr);
784	if ((pDis->uInstrAddr >> PAGE_SHIFT) == ((uSrcAddr + cbMaxRead - 1) >> PAGE_SHIFT))
785	{
786	memcpy(&pDis->abInstr[offInstr], &pDisInfo->pbSrcInstr[offInstr], cbMaxRead);
787	offInstr += cbMaxRead;
788	rc = VINF_SUCCESS;
789	}
790	else if ( (pDis->uInstrAddr >> PAGE_SHIFT) == ((uSrcAddr + cbMinRead - 1) >> PAGE_SHIFT)
791	\|\| PATMIsPatchGCAddr(pDisInfo->pVM, uSrcAddr) /** @todo does CSAM actually analyze patch code, or is this just a copy&past check? */
792	)
793	{
794	memcpy(&pDis->abInstr[offInstr], &pDisInfo->pbSrcInstr[offInstr], cbMinRead);
795	offInstr += cbMinRead;
796	rc = VINF_SUCCESS;
797	}
798	else
799	{
800	/* Crossed page boundrary, pbSrcInstr is no good... */
801	rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pDisInfo->pVM), &pDis->abInstr[offInstr], uSrcAddr, cbMinRead);
802	offInstr += cbMinRead;
803	}
804
805	pDis->cbCachedInstr = offInstr;
806	return rc;
807	}
808
809	DECLINLINE(int) csamR3DISInstr(PVM pVM, RTRCPTR InstrGC, uint8_t *InstrHC, DISCPUMODE enmCpuMode,
810	PDISCPUSTATE pCpu, uint32_t pcbInstr, char pszOutput, size_t cbOutput)
811	{
812	CSAMDISINFO DisInfo = { pVM, InstrHC };
813	#ifdef DEBUG
814	return DISInstrToStrEx(InstrGC, enmCpuMode, csamR3ReadBytes, &DisInfo, DISOPTYPE_ALL,
815	pCpu, pcbInstr, pszOutput, cbOutput);
816	#else
817	/* We are interested in everything except harmless stuff */
818	if (pszOutput)
819	return DISInstrToStrEx(InstrGC, enmCpuMode, csamR3ReadBytes, &DisInfo,
820	~(DISOPTYPE_INVALID \| DISOPTYPE_HARMLESS \| DISOPTYPE_RRM_MASK),
821	pCpu, pcbInstr, pszOutput, cbOutput);
822	return DISInstrEx(InstrGC, enmCpuMode, ~(DISOPTYPE_INVALID \| DISOPTYPE_HARMLESS \| DISOPTYPE_RRM_MASK),
823	csamR3ReadBytes, &DisInfo, pCpu, pcbInstr);
824	#endif
825	}
826
827	/**
828	* Analyses the instructions following the cli for compliance with our heuristics for cli
829	*
830	* @returns VBox status code.
831	* @param pVM Pointer to the VM.
832	* @param pCpu CPU disassembly state
833	* @param pInstrGC Guest context pointer to privileged instruction
834	* @param pCurInstrGC Guest context pointer to the current instruction
835	* @param pCacheRec GC to HC cache record
836	* @param pUserData User pointer (callback specific)
837	*
838	*/
839	static int CSAMR3AnalyseCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t *) pCurInstrGC,
840	PCSAMP2GLOOKUPREC pCacheRec, void *pUserData)
841	{
842	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
843	int rc;
844	NOREF(pInstrGC);
845
846	switch (pCpu->pCurInstr->uOpcode)
847	{
848	case OP_INT:
849	Assert(pCpu->Param1.fUse & DISUSE_IMMEDIATE8);
850	if (pCpu->Param1.uValue == 3)
851	{
852	//two byte int 3
853	return VINF_SUCCESS;
854	}
855	break;
856
857	/* removing breaks win2k guests? */
858	case OP_IRET:
859	if (EMIsRawRing1Enabled(pVM))
860	break;
861	/* no break */
862
863	case OP_ILLUD2:
864	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue. */
865	case OP_RETN:
866	case OP_INT3:
867	case OP_INVALID:
868	return VINF_SUCCESS;
869	}
870
871	// Check for exit points
872	switch (pCpu->pCurInstr->uOpcode)
873	{
874	/* It's not a good idea to patch pushf instructions:
875	* - increases the chance of conflicts (code jumping to the next instruction)
876	* - better to patch the cli
877	* - code that branches before the cli will likely hit an int 3
878	* - in general doesn't offer any benefits as we don't allow nested patch blocks (IF is always 1)
879	*/
880	case OP_PUSHF:
881	case OP_POPF:
882	break;
883
884	case OP_CLI:
885	{
886	uint32_t cbInstrs = 0;
887	uint32_t cbCurInstr = pCpu->cbInstr;
888	bool fCode32 = pPage->fCode32;
889
890	Assert(fCode32);
891
892	PATMR3AddHint(pVM, pCurInstrGC, (fCode32) ? PATMFL_CODE32 : 0);
893
894	/* Make sure the instructions that follow the cli have not been encountered before. */
895	while (true)
896	{
897	DISCPUSTATE cpu;
898
899	if (cbInstrs + cbCurInstr >= SIZEOF_NEARJUMP32)
900	break;
901
902	if (csamIsCodeScanned(pVM, pCurInstrGC + cbCurInstr, &pPage) == true)
903	{
904	/* We've scanned the next instruction(s) already. This means we've
905	followed a branch that ended up there before -> dangerous!! */
906	PATMR3DetectConflict(pVM, pCurInstrGC, pCurInstrGC + cbCurInstr);
907	break;
908	}
909	pCurInstrGC += cbCurInstr;
910	cbInstrs += cbCurInstr;
911
912	{ /* Force pCurInstrHC out of scope after we stop using it (page lock!) */
913	uint8_t *pCurInstrHC = csamR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
914	if (pCurInstrHC == NULL)
915	{
916	Log(("csamR3GCVirtToHCVirt failed for %RRv\n", pCurInstrGC));
917	break;
918	}
919	Assert(VALID_PTR(pCurInstrHC));
920
921	rc = csamR3DISInstr(pVM, pCurInstrGC, pCurInstrHC, (fCode32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
922	&cpu, &cbCurInstr, NULL, 0);
923	}
924	AssertRC(rc);
925	if (RT_FAILURE(rc))
926	break;
927	}
928	break;
929	}
930
931	#ifdef VBOX_WITH_RAW_RING1
932	case OP_MOV:
933	/* mov xx, CS is a dangerous instruction as our raw ring usage leaks through. */
934	if ( EMIsRawRing1Enabled(pVM)
935	&& (pCpu->Param2.fUse & DISUSE_REG_SEG)
936	&& (pCpu->Param2.Base.idxSegReg == DISSELREG_CS))
937	{
938	Log(("CSAM: Patching dangerous 'mov xx, cs' instruction at %RGv with an int3\n", pCurInstrGC));
939	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
940	{
941	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
942	if (RT_FAILURE(rc))
943	{
944	Log(("PATMR3InstallPatch failed with %d\n", rc));
945	return VWRN_CONTINUE_ANALYSIS;
946	}
947	}
948	return VWRN_CONTINUE_ANALYSIS;
949	}
950	break;
951	#endif
952
953	case OP_PUSH:
954	/** @todo broken comparison!! should be if ((pCpu->Param1.fUse & DISUSE_REG_SEG) && (pCpu->Param1.Base.idxSegReg == DISSELREG_SS)) */
955	if (pCpu->pCurInstr->fParam1 != OP_PARM_REG_CS)
956	break;
957
958	/* no break */
959	#ifndef VBOX_WITH_SAFE_STR
960	case OP_STR:
961	#endif
962	case OP_LSL:
963	case OP_LAR:
964	case OP_SGDT:
965	case OP_SLDT:
966	case OP_SIDT:
967	case OP_SMSW:
968	case OP_VERW:
969	case OP_VERR:
970	case OP_CPUID:
971	case OP_IRET:
972	#ifdef DEBUG
973	switch(pCpu->pCurInstr->uOpcode)
974	{
975	case OP_STR:
976	Log(("Privileged instruction at %RRv: str!!\n", pCurInstrGC));
977	break;
978	case OP_LSL:
979	Log(("Privileged instruction at %RRv: lsl!!\n", pCurInstrGC));
980	break;
981	case OP_LAR:
982	Log(("Privileged instruction at %RRv: lar!!\n", pCurInstrGC));
983	break;
984	case OP_SGDT:
985	Log(("Privileged instruction at %RRv: sgdt!!\n", pCurInstrGC));
986	break;
987	case OP_SLDT:
988	Log(("Privileged instruction at %RRv: sldt!!\n", pCurInstrGC));
989	break;
990	case OP_SIDT:
991	Log(("Privileged instruction at %RRv: sidt!!\n", pCurInstrGC));
992	break;
993	case OP_SMSW:
994	Log(("Privileged instruction at %RRv: smsw!!\n", pCurInstrGC));
995	break;
996	case OP_VERW:
997	Log(("Privileged instruction at %RRv: verw!!\n", pCurInstrGC));
998	break;
999	case OP_VERR:
1000	Log(("Privileged instruction at %RRv: verr!!\n", pCurInstrGC));
1001	break;
1002	case OP_CPUID:
1003	Log(("Privileged instruction at %RRv: cpuid!!\n", pCurInstrGC));
1004	break;
1005	case OP_PUSH:
1006	Log(("Privileged instruction at %RRv: push cs!!\n", pCurInstrGC));
1007	break;
1008	case OP_IRET:
1009	Log(("Privileged instruction at %RRv: iret!!\n", pCurInstrGC));
1010	break;
1011	}
1012	#endif
1013
1014	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
1015	{
1016	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
1017	if (RT_FAILURE(rc))
1018	{
1019	Log(("PATMR3InstallPatch failed with %d\n", rc));
1020	return VWRN_CONTINUE_ANALYSIS;
1021	}
1022	}
1023	if (pCpu->pCurInstr->uOpcode == OP_IRET)
1024	return VINF_SUCCESS; /* Look no further in this branch. */
1025
1026	return VWRN_CONTINUE_ANALYSIS;
1027
1028	case OP_JMP:
1029	case OP_CALL:
1030	{
1031	// return or jump/call through a jump table
1032	if (OP_PARM_VTYPE(pCpu->pCurInstr->fParam1) != OP_PARM_J)
1033	{
1034	#ifdef DEBUG
1035	switch(pCpu->pCurInstr->uOpcode)
1036	{
1037	case OP_JMP:
1038	Log(("Control Flow instruction at %RRv: jmp!!\n", pCurInstrGC));
1039	break;
1040	case OP_CALL:
1041	Log(("Control Flow instruction at %RRv: call!!\n", pCurInstrGC));
1042	break;
1043	}
1044	#endif
1045	return VWRN_CONTINUE_ANALYSIS;
1046	}
1047	return VWRN_CONTINUE_ANALYSIS;
1048	}
1049
1050	}
1051
1052	return VWRN_CONTINUE_ANALYSIS;
1053	}
1054
1055	#ifdef CSAM_ANALYSE_BEYOND_RET
1056	/**
1057	* Wrapper for csamAnalyseCodeStream for call instructions.
1058	*
1059	* @returns VBox status code.
1060	* @param pVM Pointer to the VM.
1061	* @param pInstrGC Guest context pointer to privileged instruction
1062	* @param pCurInstrGC Guest context pointer to the current instruction
1063	* @param fCode32 16 or 32 bits code
1064	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1065	* @param pUserData User pointer (callback specific)
1066	*
1067	*/
1068	static int csamAnalyseCallCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1069	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1070	{
1071	int rc;
1072	CSAMCALLEXITREC CallExitRec;
1073	PCSAMCALLEXITREC pOldCallRec;
1074	PCSAMPAGE pPage = 0;
1075	uint32_t i;
1076
1077	CallExitRec.cInstrAfterRet = 0;
1078
1079	pOldCallRec = pCacheRec->pCallExitRec;
1080	pCacheRec->pCallExitRec = &CallExitRec;
1081
1082	rc = csamAnalyseCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1083
1084	for (i=0;i<CallExitRec.cInstrAfterRet;i++)
1085	{
1086	PCSAMPAGE pPage = 0;
1087
1088	pCurInstrGC = CallExitRec.pInstrAfterRetGC[i];
1089
1090	/* Check if we've previously encountered the instruction after the ret. */
1091	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1092	{
1093	DISCPUSTATE cpu;
1094	uint32_t cbInstr;
1095	int rc2;
1096	#ifdef DEBUG
1097	char szOutput[256];
1098	#endif
1099	if (pPage == NULL)
1100	{
1101	/* New address; let's take a look at it. */
1102	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1103	if (pPage == NULL)
1104	{
1105	rc = VERR_NO_MEMORY;
1106	goto done;
1107	}
1108	}
1109
1110	/**
1111	* Some generic requirements for recognizing an adjacent function:
1112	* - alignment fillers that consist of:
1113	* - nop
1114	* - lea genregX, [genregX (+ 0)]
1115	* - push ebp after the filler (can extend this later); aligned at at least a 4 byte boundary
1116	*/
1117	for (int j = 0; j < 16; j++)
1118	{
1119	uint8_t *pCurInstrHC = csamR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1120	if (pCurInstrHC == NULL)
1121	{
1122	Log(("csamR3GCVirtToHCVirt failed for %RRv\n", pCurInstrGC));
1123	goto done;
1124	}
1125	Assert(VALID_PTR(pCurInstrHC));
1126
1127	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1128	#ifdef DEBUG
1129	rc2 = csamR3DISInstr(pVM, pCurInstrGC, pCurInstrHC, (fCode32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
1130	&cpu, &cbInstr, szOutput, sizeof(szOutput));
1131	if (RT_SUCCESS(rc2)) Log(("CSAM Call Analysis: %s", szOutput));
1132	#else
1133	rc2 = csamR3DISInstr(pVM, pCurInstrGC, pCurInstrHC, (fCode32) ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
1134	&cpu, &cbInstr, NULL, 0);
1135	#endif
1136	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1137	if (RT_FAILURE(rc2))
1138	{
1139	Log(("Disassembly failed at %RRv with %Rrc (probably page not present) -> return to caller\n", pCurInstrGC, rc2));
1140	goto done;
1141	}
1142
1143	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, cbInstr);
1144
1145	RCPTRTYPE(uint8_t *) addr = 0;
1146	PCSAMPAGE pJmpPage = NULL;
1147
1148	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + cbInstr - 1))
1149	{
1150	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + cbInstr - 1))
1151	{
1152	/// @todo fault in the page
1153	Log(("Page for current instruction %RRv is not present!!\n", pCurInstrGC));
1154	goto done;
1155	}
1156	//all is fine, let's continue
1157	csamR3CheckPageRecord(pVM, pCurInstrGC + cbInstr - 1);
1158	}
1159
1160	switch (cpu.pCurInstr->uOpcode)
1161	{
1162	case OP_NOP:
1163	case OP_INT3:
1164	break; /* acceptable */
1165
1166	case OP_LEA:
1167	/* Must be similar to:
1168	*
1169	* lea esi, [esi]
1170	* lea esi, [esi+0]
1171	* Any register is allowed as long as source and destination are identical.
1172	*/
1173	if ( cpu.Param1.fUse != DISUSE_REG_GEN32
1174	\|\| ( cpu.Param2.flags != DISUSE_REG_GEN32
1175	&& ( !(cpu.Param2.flags & DISUSE_REG_GEN32)
1176	\|\| !(cpu.Param2.flags & (DISUSE_DISPLACEMENT8\|DISUSE_DISPLACEMENT16\|DISUSE_DISPLACEMENT32))
1177	\|\| cpu.Param2.uValue != 0
1178	)
1179	)
1180	\|\| cpu.Param1.base.reg_gen32 != cpu.Param2.base.reg_gen32
1181	)
1182	{
1183	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1184	goto next_function;
1185	}
1186	break;
1187
1188	case OP_PUSH:
1189	{
1190	if ( (pCurInstrGC & 0x3) != 0
1191	\|\| cpu.Param1.fUse != DISUSE_REG_GEN32
1192	\|\| cpu.Param1.base.reg_gen32 != USE_REG_EBP
1193	)
1194	{
1195	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1196	goto next_function;
1197	}
1198
1199	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1200	{
1201	CSAMCALLEXITREC CallExitRec2;
1202	CallExitRec2.cInstrAfterRet = 0;
1203
1204	pCacheRec->pCallExitRec = &CallExitRec2;
1205
1206	/* Analyse the function. */
1207	Log(("Found new function at %RRv\n", pCurInstrGC));
1208	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1209	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1210	}
1211	goto next_function;
1212	}
1213
1214	case OP_SUB:
1215	{
1216	if ( (pCurInstrGC & 0x3) != 0
1217	\|\| cpu.Param1.fUse != DISUSE_REG_GEN32
1218	\|\| cpu.Param1.base.reg_gen32 != USE_REG_ESP
1219	)
1220	{
1221	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1222	goto next_function;
1223	}
1224
1225	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1226	{
1227	CSAMCALLEXITREC CallExitRec2;
1228	CallExitRec2.cInstrAfterRet = 0;
1229
1230	pCacheRec->pCallExitRec = &CallExitRec2;
1231
1232	/* Analyse the function. */
1233	Log(("Found new function at %RRv\n", pCurInstrGC));
1234	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1235	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1236	}
1237	goto next_function;
1238	}
1239
1240	default:
1241	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1242	goto next_function;
1243	}
1244	/* Mark it as scanned. */
1245	csamMarkCode(pVM, pPage, pCurInstrGC, cbInstr, true);
1246	pCurInstrGC += cbInstr;
1247	} /* for at most 16 instructions */
1248	next_function:
1249	; /* MSVC complains otherwise */
1250	}
1251	}
1252	done:
1253	pCacheRec->pCallExitRec = pOldCallRec;
1254	return rc;
1255	}
1256	#else
1257	#define csamAnalyseCallCodeStream csamAnalyseCodeStream
1258	#endif
1259
1260	/**
1261	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
1262	*
1263	* @returns VBox status code.
1264	* @param pVM Pointer to the VM.
1265	* @param pInstrGC Guest context pointer to privileged instruction
1266	* @param pCurInstrGC Guest context pointer to the current instruction
1267	* @param fCode32 16 or 32 bits code
1268	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1269	* @param pUserData User pointer (callback specific)
1270	*
1271	*/
1272	static int csamAnalyseCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1273	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1274	{
1275	DISCPUSTATE cpu;
1276	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
1277	int rc = VWRN_CONTINUE_ANALYSIS;
1278	uint32_t cbInstr;
1279	int rc2;
1280	Assert(pVM->cCpus == 1);
1281	PVMCPU pVCpu = VMMGetCpu0(pVM);
1282
1283	#ifdef DEBUG
1284	char szOutput[256];
1285	#endif
1286
1287	LogFlow(("csamAnalyseCodeStream: code at %RRv depth=%d\n", pCurInstrGC, pCacheRec->depth));
1288
1289	pVM->csam.s.fScanningStarted = true;
1290
1291	pCacheRec->depth++;
1292	/*
1293	* Limit the call depth. (rather arbitrary upper limit; too low and we won't detect certain
1294	* cpuid instructions in Linux kernels; too high and we waste too much time scanning code)
1295	* (512 is necessary to detect cpuid instructions in Red Hat EL4; see defect 1355)
1296	* @note we are using a lot of stack here. couple of 100k when we go to the full depth (!)
1297	*/
1298	if (pCacheRec->depth > 512)
1299	{
1300	LogFlow(("CSAM: maximum calldepth reached for %RRv\n", pCurInstrGC));
1301	pCacheRec->depth--;
1302	return VINF_SUCCESS; //let's not go on forever
1303	}
1304
1305	Assert(!PATMIsPatchGCAddr(pVM, pCurInstrGC));
1306	csamR3CheckPageRecord(pVM, pCurInstrGC);
1307
1308	while(rc == VWRN_CONTINUE_ANALYSIS)
1309	{
1310	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1311	{
1312	if (pPage == NULL)
1313	{
1314	/* New address; let's take a look at it. */
1315	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1316	if (pPage == NULL)
1317	{
1318	rc = VERR_NO_MEMORY;
1319	goto done;
1320	}
1321	}
1322	}
1323	else
1324	{
1325	LogFlow(("Code at %RRv has been scanned before\n", pCurInstrGC));
1326	rc = VINF_SUCCESS;
1327	goto done;
1328	}
1329
1330	{ /* Force pCurInstrHC out of scope after we stop using it (page lock!) */
1331	uint8_t *pCurInstrHC = csamR3GCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1332	if (pCurInstrHC == NULL)
1333	{
1334	Log(("csamR3GCVirtToHCVirt failed for %RRv\n", pCurInstrGC));
1335	rc = VERR_PATCHING_REFUSED;
1336	goto done;
1337	}
1338	Assert(VALID_PTR(pCurInstrHC));
1339
1340	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1341	#ifdef DEBUG
1342	rc2 = csamR3DISInstr(pVM, pCurInstrGC, pCurInstrHC, fCode32 ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
1343	&cpu, &cbInstr, szOutput, sizeof(szOutput));
1344	if (RT_SUCCESS(rc2)) Log(("CSAM Analysis: %s", szOutput));
1345	#else
1346	rc2 = csamR3DISInstr(pVM, pCurInstrGC, pCurInstrHC, fCode32 ? DISCPUMODE_32BIT : DISCPUMODE_16BIT,
1347	&cpu, &cbInstr, NULL, 0);
1348	#endif
1349	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1350	}
1351	if (RT_FAILURE(rc2))
1352	{
1353	Log(("Disassembly failed at %RRv with %Rrc (probably page not present) -> return to caller\n", pCurInstrGC, rc2));
1354	rc = VINF_SUCCESS;
1355	goto done;
1356	}
1357
1358	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, cbInstr);
1359
1360	csamMarkCode(pVM, pPage, pCurInstrGC, cbInstr, true);
1361
1362	RCPTRTYPE(uint8_t *) addr = 0;
1363	PCSAMPAGE pJmpPage = NULL;
1364
1365	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + cbInstr - 1))
1366	{
1367	if (!PGMGstIsPagePresent(pVCpu, pCurInstrGC + cbInstr - 1))
1368	{
1369	/// @todo fault in the page
1370	Log(("Page for current instruction %RRv is not present!!\n", pCurInstrGC));
1371	rc = VWRN_CONTINUE_ANALYSIS;
1372	goto next_please;
1373	}
1374	//all is fine, let's continue
1375	csamR3CheckPageRecord(pVM, pCurInstrGC + cbInstr - 1);
1376	}
1377	/*
1378	* If it's harmless, then don't bother checking it (the disasm tables had better be accurate!)
1379	*/
1380	if ((cpu.pCurInstr->fOpType & ~DISOPTYPE_RRM_MASK) == DISOPTYPE_HARMLESS)
1381	{
1382	AssertMsg(pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage) == VWRN_CONTINUE_ANALYSIS, ("Instruction incorrectly marked harmless?!?!?\n"));
1383	rc = VWRN_CONTINUE_ANALYSIS;
1384	goto next_please;
1385	}
1386
1387	#ifdef CSAM_ANALYSE_BEYOND_RET
1388	/* Remember the address of the instruction following the ret in case the parent instruction was a call. */
1389	if ( pCacheRec->pCallExitRec
1390	&& cpu.pCurInstr->uOpcode == OP_RETN
1391	&& pCacheRec->pCallExitRec->cInstrAfterRet < CSAM_MAX_CALLEXIT_RET)
1392	{
1393	pCacheRec->pCallExitRec->pInstrAfterRetGC[pCacheRec->pCallExitRec->cInstrAfterRet] = pCurInstrGC + cbInstr;
1394	pCacheRec->pCallExitRec->cInstrAfterRet++;
1395	}
1396	#endif
1397
1398	rc = pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage);
1399	if (rc == VINF_SUCCESS)
1400	goto done;
1401
1402	// For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction)
1403	if ( ((cpu.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->fParam1) == OP_PARM_J))
1404	\|\| (cpu.pCurInstr->uOpcode == OP_CALL && cpu.Param1.fUse == DISUSE_DISPLACEMENT32)) /* simple indirect call (call dword ptr [address]) */
1405	{
1406	/* We need to parse 'call dword ptr [address]' type of calls to catch cpuid instructions in some recent Linux distributions (e.g. OpenSuse 10.3) */
1407	if ( cpu.pCurInstr->uOpcode == OP_CALL
1408	&& cpu.Param1.fUse == DISUSE_DISPLACEMENT32)
1409	{
1410	addr = 0;
1411	PGMPhysSimpleReadGCPtr(pVCpu, &addr, (RTRCUINTPTR)cpu.Param1.uDisp.i32, sizeof(addr));
1412	}
1413	else
1414	addr = CSAMResolveBranch(&cpu, pCurInstrGC);
1415
1416	if (addr == 0)
1417	{
1418	Log(("We don't support far jumps here!! (%08X)\n", cpu.Param1.fUse));
1419	rc = VINF_SUCCESS;
1420	break;
1421	}
1422	Assert(!PATMIsPatchGCAddr(pVM, addr));
1423
1424	/* If the target address lies in a patch generated jump, then special action needs to be taken. */
1425	PATMR3DetectConflict(pVM, pCurInstrGC, addr);
1426
1427	/* Same page? */
1428	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pCurInstrGC ))
1429	{
1430	if (!PGMGstIsPagePresent(pVCpu, addr))
1431	{
1432	Log(("Page for current instruction %RRv is not present!!\n", addr));
1433	rc = VWRN_CONTINUE_ANALYSIS;
1434	goto next_please;
1435	}
1436
1437	/* All is fine, let's continue. */
1438	csamR3CheckPageRecord(pVM, addr);
1439	}
1440
1441	pJmpPage = NULL;
1442	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1443	{
1444	if (pJmpPage == NULL)
1445	{
1446	/* New branch target; let's take a look at it. */
1447	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1448	if (pJmpPage == NULL)
1449	{
1450	rc = VERR_NO_MEMORY;
1451	goto done;
1452	}
1453	Assert(pPage);
1454	}
1455	if (cpu.pCurInstr->uOpcode == OP_CALL)
1456	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1457	else
1458	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1459
1460	if (rc != VINF_SUCCESS) {
1461	goto done;
1462	}
1463	}
1464	if (cpu.pCurInstr->uOpcode == OP_JMP)
1465	{//unconditional jump; return to caller
1466	rc = VINF_SUCCESS;
1467	goto done;
1468	}
1469
1470	rc = VWRN_CONTINUE_ANALYSIS;
1471	} //if ((cpu.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->fParam1) == OP_PARM_J))
1472	#ifdef CSAM_SCAN_JUMP_TABLE
1473	else
1474	if ( cpu.pCurInstr->uOpcode == OP_JMP
1475	&& (cpu.Param1.fUse & (DISUSE_DISPLACEMENT32\|DISUSE_INDEX\|DISUSE_SCALE)) == (DISUSE_DISPLACEMENT32\|DISUSE_INDEX\|DISUSE_SCALE)
1476	)
1477	{
1478	RTRCPTR pJumpTableGC = (RTRCPTR)cpu.Param1.disp32;
1479	uint8_t *pJumpTableHC;
1480	int rc2;
1481
1482	Log(("Jump through jump table\n"));
1483
1484	rc2 = PGMPhysGCPtr2CCPtrReadOnly(pVCpu, pJumpTableGC, (PRTHCPTR)&pJumpTableHC, missing page lock);
1485	if (rc2 == VINF_SUCCESS)
1486	{
1487	for (uint32_t i=0;i<2;i++)
1488	{
1489	uint64_t fFlags;
1490
1491	addr = pJumpTableGC + cpu.Param1.scale * i;
1492	/* Same page? */
1493	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pJumpTableGC))
1494	break;
1495
1496	addr = (RTRCPTR )(pJumpTableHC + cpu.Param1.scale * i);
1497
1498	rc2 = PGMGstGetPage(pVCpu, addr, &fFlags, NULL);
1499	if ( rc2 != VINF_SUCCESS
1500	\|\| (fFlags & X86_PTE_US)
1501	\|\| !(fFlags & X86_PTE_P)
1502	)
1503	break;
1504
1505	Log(("Jump to %RRv\n", addr));
1506
1507	pJmpPage = NULL;
1508	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1509	{
1510	if (pJmpPage == NULL)
1511	{
1512	/* New branch target; let's take a look at it. */
1513	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1514	if (pJmpPage == NULL)
1515	{
1516	rc = VERR_NO_MEMORY;
1517	goto done;
1518	}
1519	Assert(pPage);
1520	}
1521	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1522	if (rc != VINF_SUCCESS) {
1523	goto done;
1524	}
1525	}
1526	}
1527	}
1528	}
1529	#endif
1530	if (rc != VWRN_CONTINUE_ANALYSIS) {
1531	break; //done!
1532	}
1533	next_please:
1534	if (cpu.pCurInstr->uOpcode == OP_JMP)
1535	{
1536	rc = VINF_SUCCESS;
1537	goto done;
1538	}
1539	pCurInstrGC += cbInstr;
1540	}
1541	done:
1542	pCacheRec->depth--;
1543	return rc;
1544	}
1545
1546
1547	/**
1548	* Calculates the 64 bits hash value for the current page
1549	*
1550	* @returns hash value
1551	* @param pVM Pointer to the VM.
1552	* @param pInstr Page address
1553	*/
1554	uint64_t csamR3CalcPageHash(PVM pVM, RTRCPTR pInstr)
1555	{
1556	uint64_t hash = 0;
1557	uint32_t val[5];
1558	int rc;
1559	Assert(pVM->cCpus == 1);
1560	PVMCPU pVCpu = VMMGetCpu0(pVM);
1561
1562	Assert((pInstr & PAGE_OFFSET_MASK) == 0);
1563
1564	rc = PGMPhysSimpleReadGCPtr(pVCpu, &val[0], pInstr, sizeof(val[0]));
1565	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1566	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1567	{
1568	Log(("csamR3CalcPageHash: page %RRv not present!!\n", pInstr));
1569	return ~0ULL;
1570	}
1571
1572	rc = PGMPhysSimpleReadGCPtr(pVCpu, &val[1], pInstr+1024, sizeof(val[0]));
1573	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1574	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1575	{
1576	Log(("csamR3CalcPageHash: page %RRv not present!!\n", pInstr));
1577	return ~0ULL;
1578	}
1579
1580	rc = PGMPhysSimpleReadGCPtr(pVCpu, &val[2], pInstr+2048, sizeof(val[0]));
1581	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1582	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1583	{
1584	Log(("csamR3CalcPageHash: page %RRv not present!!\n", pInstr));
1585	return ~0ULL;
1586	}
1587
1588	rc = PGMPhysSimpleReadGCPtr(pVCpu, &val[3], pInstr+3072, sizeof(val[0]));
1589	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1590	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1591	{
1592	Log(("csamR3CalcPageHash: page %RRv not present!!\n", pInstr));
1593	return ~0ULL;
1594	}
1595
1596	rc = PGMPhysSimpleReadGCPtr(pVCpu, &val[4], pInstr+4092, sizeof(val[0]));
1597	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1598	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1599	{
1600	Log(("csamR3CalcPageHash: page %RRv not present!!\n", pInstr));
1601	return ~0ULL;
1602	}
1603
1604	// don't want to get division by zero traps
1605	val[2] \|= 1;
1606	val[4] \|= 1;
1607
1608	hash = (uint64_t)val[0] * (uint64_t)val[1] / (uint64_t)val[2] + (val[3]%val[4]);
1609	return (hash == ~0ULL) ? hash - 1 : hash;
1610	}
1611
1612
1613	/**
1614	* Notify CSAM of a page flush
1615	*
1616	* @returns VBox status code
1617	* @param pVM Pointer to the VM.
1618	* @param addr GC address of the page to flush
1619	* @param fRemovePage Page removal flag
1620	*/
1621	static int csamFlushPage(PVM pVM, RTRCPTR addr, bool fRemovePage)
1622	{
1623	PCSAMPAGEREC pPageRec;
1624	int rc;
1625	RTGCPHYS GCPhys = 0;
1626	uint64_t fFlags = 0;
1627	Assert(pVM->cCpus == 1 \|\| !CSAMIsEnabled(pVM));
1628
1629	if (!CSAMIsEnabled(pVM))
1630	return VINF_SUCCESS;
1631	Assert(!HMIsEnabled(pVM));
1632
1633	PVMCPU pVCpu = VMMGetCpu0(pVM);
1634
1635	STAM_PROFILE_START(&pVM->csam.s.StatTimeFlushPage, a);
1636
1637	addr = addr & PAGE_BASE_GC_MASK;
1638
1639	/*
1640	* Note: searching for the page in our tree first is more expensive (skipped flushes are two orders of magnitude more common)
1641	*/
1642	if (pVM->csam.s.pPageTree == NULL)
1643	{
1644	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1645	return VWRN_CSAM_PAGE_NOT_FOUND;
1646	}
1647
1648	rc = PGMGstGetPage(pVCpu, addr, &fFlags, &GCPhys);
1649	/* Returned at a very early stage (no paging yet presumably). */
1650	if (rc == VERR_NOT_SUPPORTED)
1651	{
1652	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1653	return rc;
1654	}
1655
1656	if (RT_SUCCESS(rc))
1657	{
1658	if ( (fFlags & X86_PTE_US)
1659	\|\| rc == VERR_PGM_PHYS_PAGE_RESERVED
1660	)
1661	{
1662	/* User page -> not relevant for us. */
1663	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1664	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1665	return VINF_SUCCESS;
1666	}
1667	}
1668	else
1669	if (rc != VERR_PAGE_NOT_PRESENT && rc != VERR_PAGE_TABLE_NOT_PRESENT)
1670	AssertMsgFailed(("PGMR3GetPage %RRv failed with %Rrc\n", addr, rc));
1671
1672	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)addr);
1673	if (pPageRec)
1674	{
1675	if ( GCPhys == pPageRec->page.GCPhys
1676	&& (fFlags & X86_PTE_P))
1677	{
1678	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1679	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1680	return VINF_SUCCESS;
1681	}
1682
1683	Log(("CSAMR3FlushPage: page %RRv has changed -> FLUSH (rc=%Rrc) (Phys: %RGp vs %RGp)\n", addr, rc, GCPhys, pPageRec->page.GCPhys));
1684
1685	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushes, 1);
1686
1687	if (fRemovePage)
1688	csamRemovePageRecord(pVM, addr);
1689	else
1690	{
1691	CSAMMarkPage(pVM, addr, false);
1692	pPageRec->page.GCPhys = 0;
1693	pPageRec->page.fFlags = 0;
1694	rc = PGMGstGetPage(pVCpu, addr, &pPageRec->page.fFlags, &pPageRec->page.GCPhys);
1695	if (rc == VINF_SUCCESS)
1696	pPageRec->page.u64Hash = csamR3CalcPageHash(pVM, addr);
1697
1698	if (pPageRec->page.pBitmap == NULL)
1699	{
1700	pPageRec->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, CSAM_PAGE_BITMAP_SIZE);
1701	Assert(pPageRec->page.pBitmap);
1702	if (pPageRec->page.pBitmap == NULL)
1703	return VERR_NO_MEMORY;
1704	}
1705	else
1706	memset(pPageRec->page.pBitmap, 0, CSAM_PAGE_BITMAP_SIZE);
1707	}
1708
1709
1710	/*
1711	* Inform patch manager about the flush; no need to repeat the above check twice.
1712	*/
1713	PATMR3FlushPage(pVM, addr);
1714
1715	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1716	return VINF_SUCCESS;
1717	}
1718	else
1719	{
1720	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1721	return VWRN_CSAM_PAGE_NOT_FOUND;
1722	}
1723	}
1724
1725	/**
1726	* Notify CSAM of a page flush
1727	*
1728	* @returns VBox status code
1729	* @param pVM Pointer to the VM.
1730	* @param addr GC address of the page to flush
1731	*/
1732	VMMR3_INT_DECL(int) CSAMR3FlushPage(PVM pVM, RTRCPTR addr)
1733	{
1734	return csamFlushPage(pVM, addr, true /* remove page record */);
1735	}
1736
1737	/**
1738	* Remove a CSAM monitored page. Use with care!
1739	*
1740	* @returns VBox status code
1741	* @param pVM Pointer to the VM.
1742	* @param addr GC address of the page to flush
1743	*/
1744	VMMR3_INT_DECL(int) CSAMR3RemovePage(PVM pVM, RTRCPTR addr)
1745	{
1746	PCSAMPAGEREC pPageRec;
1747	int rc;
1748
1749	AssertReturn(!HMIsEnabled(pVM), VERR_CSAM_HM_IPE);
1750
1751	addr = addr & PAGE_BASE_GC_MASK;
1752
1753	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)addr);
1754	if (pPageRec)
1755	{
1756	rc = csamRemovePageRecord(pVM, addr);
1757	if (RT_SUCCESS(rc))
1758	PATMR3FlushPage(pVM, addr);
1759	return VINF_SUCCESS;
1760	}
1761	return VWRN_CSAM_PAGE_NOT_FOUND;
1762	}
1763
1764	/**
1765	* Check a page record in case a page has been changed
1766	*
1767	* @returns VBox status code. (trap handled or not)
1768	* @param pVM Pointer to the VM.
1769	* @param pInstrGC GC instruction pointer
1770	*/
1771	int csamR3CheckPageRecord(PVM pVM, RTRCPTR pInstrGC)
1772	{
1773	PCSAMPAGEREC pPageRec;
1774	uint64_t u64hash;
1775
1776	pInstrGC = pInstrGC & PAGE_BASE_GC_MASK;
1777
1778	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)pInstrGC);
1779	if (pPageRec)
1780	{
1781	u64hash = csamR3CalcPageHash(pVM, pInstrGC);
1782	if (u64hash != pPageRec->page.u64Hash)
1783	csamFlushPage(pVM, pInstrGC, false /* don't remove page record */);
1784	}
1785	else
1786	return VWRN_CSAM_PAGE_NOT_FOUND;
1787
1788	return VINF_SUCCESS;
1789	}
1790
1791	/**
1792	* Returns monitor description based on CSAM tag
1793	*
1794	* @return description string
1795	* @param enmTag Owner tag
1796	*/
1797	const char *csamGetMonitorDescription(CSAMTAG enmTag)
1798	{
1799	if (enmTag == CSAM_TAG_PATM)
1800	return "CSAM-PATM self-modifying code monitor handler";
1801	else
1802	if (enmTag == CSAM_TAG_REM)
1803	return "CSAM-REM self-modifying code monitor handler";
1804	Assert(enmTag == CSAM_TAG_CSAM);
1805	return "CSAM self-modifying code monitor handler";
1806	}
1807
1808	/**
1809	* Adds page record to our lookup tree
1810	*
1811	* @returns CSAMPAGE ptr or NULL if failure
1812	* @param pVM Pointer to the VM.
1813	* @param GCPtr Page address
1814	* @param enmTag Owner tag
1815	* @param fCode32 16 or 32 bits code
1816	* @param fMonitorInvalidation Monitor page invalidation flag
1817	*/
1818	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTRCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation)
1819	{
1820	PCSAMPAGEREC pPage;
1821	int rc;
1822	bool ret;
1823	Assert(pVM->cCpus == 1);
1824	PVMCPU pVCpu = VMMGetCpu0(pVM);
1825
1826	Log(("New page record for %RRv\n", GCPtr & PAGE_BASE_GC_MASK));
1827
1828	pPage = (PCSAMPAGEREC)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, sizeof(CSAMPAGEREC));
1829	if (pPage == NULL)
1830	{
1831	AssertMsgFailed(("csamCreatePageRecord: Out of memory!!!!\n"));
1832	return NULL;
1833	}
1834	/* Round down to page boundary. */
1835	GCPtr = (GCPtr & PAGE_BASE_GC_MASK);
1836	pPage->Core.Key = (AVLPVKEY)(uintptr_t)GCPtr;
1837	pPage->page.pPageGC = GCPtr;
1838	pPage->page.fCode32 = fCode32;
1839	pPage->page.fMonitorInvalidation = fMonitorInvalidation;
1840	pPage->page.enmTag = enmTag;
1841	pPage->page.fMonitorActive = false;
1842	pPage->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, PAGE_SIZE/sizeof(uint8_t));
1843	rc = PGMGstGetPage(pVCpu, GCPtr, &pPage->page.fFlags, &pPage->page.GCPhys);
1844	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1845
1846	pPage->page.u64Hash = csamR3CalcPageHash(pVM, GCPtr);
1847	ret = RTAvlPVInsert(&pVM->csam.s.pPageTree, &pPage->Core);
1848	Assert(ret);
1849
1850	#ifdef CSAM_MONITOR_CODE_PAGES
1851	AssertRelease(!fInCSAMCodePageInvalidate);
1852
1853	switch (enmTag)
1854	{
1855	case CSAM_TAG_PATM:
1856	case CSAM_TAG_REM:
1857	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1858	case CSAM_TAG_CSAM:
1859	#endif
1860	{
1861	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtr, GCPtr + (PAGE_SIZE - 1) /* inclusive! */,
1862	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1863	csamGetMonitorDescription(enmTag));
1864	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %RRv failed with %Rrc\n", GCPtr, rc));
1865	if (RT_FAILURE(rc))
1866	Log(("PGMR3HandlerVirtualRegisterEx for %RRv failed with %Rrc\n", GCPtr, rc));
1867
1868	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1869
1870	/* Prefetch it in case it's not there yet. */
1871	rc = PGMPrefetchPage(pVCpu, GCPtr);
1872	AssertRC(rc);
1873
1874	rc = PGMShwMakePageReadonly(pVCpu, GCPtr, 0 /fFlags/);
1875	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1876
1877	pPage->page.fMonitorActive = true;
1878	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1879	break;
1880	}
1881	default:
1882	break; /* to shut up GCC */
1883	}
1884
1885	Log(("csamCreatePageRecord %RRv GCPhys=%RGp\n", GCPtr, pPage->page.GCPhys));
1886
1887	#ifdef VBOX_WITH_STATISTICS
1888	switch (enmTag)
1889	{
1890	case CSAM_TAG_CSAM:
1891	STAM_COUNTER_INC(&pVM->csam.s.StatPageCSAM);
1892	break;
1893	case CSAM_TAG_PATM:
1894	STAM_COUNTER_INC(&pVM->csam.s.StatPagePATM);
1895	break;
1896	case CSAM_TAG_REM:
1897	STAM_COUNTER_INC(&pVM->csam.s.StatPageREM);
1898	break;
1899	default:
1900	break; /* to shut up GCC */
1901	}
1902	#endif
1903
1904	#endif
1905
1906	STAM_COUNTER_INC(&pVM->csam.s.StatNrPages);
1907	if (fMonitorInvalidation)
1908	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1909
1910	return &pPage->page;
1911	}
1912
1913	/**
1914	* Monitors a code page (if not already monitored)
1915	*
1916	* @returns VBox status code
1917	* @param pVM Pointer to the VM.
1918	* @param pPageAddrGC The page to monitor
1919	* @param enmTag Monitor tag
1920	*/
1921	VMMR3DECL(int) CSAMR3MonitorPage(PVM pVM, RTRCPTR pPageAddrGC, CSAMTAG enmTag)
1922	{
1923	PCSAMPAGEREC pPageRec = NULL;
1924	int rc;
1925	bool fMonitorInvalidation;
1926	Assert(pVM->cCpus == 1);
1927	PVMCPU pVCpu = VMMGetCpu0(pVM);
1928	Assert(!HMIsEnabled(pVM));
1929
1930	/* Dirty pages must be handled before calling this function!. */
1931	Assert(!pVM->csam.s.cDirtyPages);
1932
1933	if (pVM->csam.s.fScanningStarted == false)
1934	return VINF_SUCCESS; /* too early */
1935
1936	pPageAddrGC &= PAGE_BASE_GC_MASK;
1937
1938	Log(("CSAMR3MonitorPage %RRv %d\n", pPageAddrGC, enmTag));
1939
1940	/** @todo implicit assumption */
1941	fMonitorInvalidation = (enmTag == CSAM_TAG_PATM);
1942
1943	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)pPageAddrGC);
1944	if (pPageRec == NULL)
1945	{
1946	uint64_t fFlags;
1947
1948	rc = PGMGstGetPage(pVCpu, pPageAddrGC, &fFlags, NULL);
1949	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
1950	if ( rc == VINF_SUCCESS
1951	&& (fFlags & X86_PTE_US))
1952	{
1953	/* We don't care about user pages. */
1954	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
1955	return VINF_SUCCESS;
1956	}
1957
1958	csamCreatePageRecord(pVM, pPageAddrGC, enmTag, true /* 32 bits code */, fMonitorInvalidation);
1959
1960	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)pPageAddrGC);
1961	Assert(pPageRec);
1962	}
1963	/** @todo reference count */
1964
1965	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1966	Assert(pPageRec->page.fMonitorActive);
1967	#endif
1968
1969	#ifdef CSAM_MONITOR_CODE_PAGES
1970	if (!pPageRec->page.fMonitorActive)
1971	{
1972	Log(("CSAMR3MonitorPage: activate monitoring for %RRv\n", pPageAddrGC));
1973
1974	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, pPageAddrGC, pPageAddrGC + (PAGE_SIZE - 1) /* inclusive! */,
1975	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1976	csamGetMonitorDescription(enmTag));
1977	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %RRv failed with %Rrc\n", pPageAddrGC, rc));
1978	if (RT_FAILURE(rc))
1979	Log(("PGMR3HandlerVirtualRegisterEx for %RRv failed with %Rrc\n", pPageAddrGC, rc));
1980
1981	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1982
1983	/* Prefetch it in case it's not there yet. */
1984	rc = PGMPrefetchPage(pVCpu, pPageAddrGC);
1985	AssertRC(rc);
1986
1987	rc = PGMShwMakePageReadonly(pVCpu, pPageAddrGC, 0 /fFlags/);
1988	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1989
1990	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1991
1992	pPageRec->page.fMonitorActive = true;
1993	pPageRec->page.fMonitorInvalidation = fMonitorInvalidation;
1994	}
1995	else
1996	if ( !pPageRec->page.fMonitorInvalidation
1997	&& fMonitorInvalidation)
1998	{
1999	Assert(pPageRec->page.fMonitorActive);
2000	PGMHandlerVirtualChangeInvalidateCallback(pVM, pPageRec->page.pPageGC, CSAMCodePageInvalidate);
2001	pPageRec->page.fMonitorInvalidation = true;
2002	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
2003
2004	/* Prefetch it in case it's not there yet. */
2005	rc = PGMPrefetchPage(pVCpu, pPageAddrGC);
2006	AssertRC(rc);
2007
2008	/* Make sure it's readonly. Page invalidation may have modified the attributes. */
2009	rc = PGMShwMakePageReadonly(pVCpu, pPageAddrGC, 0 /fFlags/);
2010	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2011	}
2012
2013	#if 0 /* def VBOX_STRICT -> very annoying) */
2014	if (pPageRec->page.fMonitorActive)
2015	{
2016	uint64_t fPageShw;
2017	RTHCPHYS GCPhys;
2018	rc = PGMShwGetPage(pVCpu, pPageAddrGC, &fPageShw, &GCPhys);
2019	// AssertMsg( (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
2020	// \|\| !(fPageShw & X86_PTE_RW)
2021	// \|\| (pPageRec->page.GCPhys == 0), ("Shadow page flags for %RRv (%RHp) aren't readonly (%RX64)!!\n", pPageAddrGC, GCPhys, fPageShw));
2022	}
2023	#endif
2024
2025	if (pPageRec->page.GCPhys == 0)
2026	{
2027	/* Prefetch it in case it's not there yet. */
2028	rc = PGMPrefetchPage(pVCpu, pPageAddrGC);
2029	AssertRC(rc);
2030	/* The page was changed behind our back. It won't be made read-only until the next SyncCR3, so force it here. */
2031	rc = PGMShwMakePageReadonly(pVCpu, pPageAddrGC, 0 /fFlags/);
2032	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2033	}
2034	#endif /* CSAM_MONITOR_CODE_PAGES */
2035	return VINF_SUCCESS;
2036	}
2037
2038	/**
2039	* Unmonitors a code page
2040	*
2041	* @returns VBox status code
2042	* @param pVM Pointer to the VM.
2043	* @param pPageAddrGC The page to monitor
2044	* @param enmTag Monitor tag
2045	*/
2046	VMMR3DECL(int) CSAMR3UnmonitorPage(PVM pVM, RTRCPTR pPageAddrGC, CSAMTAG enmTag)
2047	{
2048	Assert(!HMIsEnabled(pVM));
2049
2050	pPageAddrGC &= PAGE_BASE_GC_MASK;
2051
2052	Log(("CSAMR3UnmonitorPage %RRv %d\n", pPageAddrGC, enmTag));
2053
2054	Assert(enmTag == CSAM_TAG_REM);
2055
2056	#ifdef VBOX_STRICT
2057	PCSAMPAGEREC pPageRec;
2058
2059	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)pPageAddrGC);
2060	Assert(pPageRec && pPageRec->page.enmTag == enmTag);
2061	#endif
2062	return CSAMR3RemovePage(pVM, pPageAddrGC);
2063	}
2064
2065	/**
2066	* Removes a page record from our lookup tree
2067	*
2068	* @returns VBox status code
2069	* @param pVM Pointer to the VM.
2070	* @param GCPtr Page address
2071	*/
2072	static int csamRemovePageRecord(PVM pVM, RTRCPTR GCPtr)
2073	{
2074	PCSAMPAGEREC pPageRec;
2075	Assert(pVM->cCpus == 1);
2076	PVMCPU pVCpu = VMMGetCpu0(pVM);
2077
2078	Log(("csamRemovePageRecord %RRv\n", GCPtr));
2079	pPageRec = (PCSAMPAGEREC)RTAvlPVRemove(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)GCPtr);
2080
2081	if (pPageRec)
2082	{
2083	STAM_COUNTER_INC(&pVM->csam.s.StatNrRemovedPages);
2084
2085	#ifdef CSAM_MONITOR_CODE_PAGES
2086	if (pPageRec->page.fMonitorActive)
2087	{
2088	/* @todo -> this is expensive (cr3 reload)!!!
2089	* if this happens often, then reuse it instead!!!
2090	*/
2091	Assert(!fInCSAMCodePageInvalidate);
2092	STAM_COUNTER_DEC(&pVM->csam.s.StatPageMonitor);
2093	PGMHandlerVirtualDeregister(pVM, GCPtr);
2094	}
2095	if (pPageRec->page.enmTag == CSAM_TAG_PATM)
2096	{
2097	/* Make sure the recompiler flushes its cache as this page is no longer monitored. */
2098	STAM_COUNTER_INC(&pVM->csam.s.StatPageRemoveREMFlush);
2099	CPUMSetChangedFlags(pVCpu, CPUM_CHANGED_GLOBAL_TLB_FLUSH);
2100	}
2101	#endif
2102
2103	#ifdef VBOX_WITH_STATISTICS
2104	switch (pPageRec->page.enmTag)
2105	{
2106	case CSAM_TAG_CSAM:
2107	STAM_COUNTER_DEC(&pVM->csam.s.StatPageCSAM);
2108	break;
2109	case CSAM_TAG_PATM:
2110	STAM_COUNTER_DEC(&pVM->csam.s.StatPagePATM);
2111	break;
2112	case CSAM_TAG_REM:
2113	STAM_COUNTER_DEC(&pVM->csam.s.StatPageREM);
2114	break;
2115	default:
2116	break; /* to shut up GCC */
2117	}
2118	#endif
2119
2120	if (pPageRec->page.pBitmap) MMR3HeapFree(pPageRec->page.pBitmap);
2121	MMR3HeapFree(pPageRec);
2122	}
2123	else
2124	AssertFailed();
2125
2126	return VINF_SUCCESS;
2127	}
2128
2129	/**
2130	* Callback for delayed writes from non-EMT threads
2131	*
2132	* @param pVM Pointer to the VM.
2133	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
2134	* @param cbBuf How much it's reading/writing.
2135	*/
2136	static DECLCALLBACK(void) CSAMDelayedWriteHandler(PVM pVM, RTRCPTR GCPtr, size_t cbBuf)
2137	{
2138	int rc = PATMR3PatchWrite(pVM, GCPtr, (uint32_t)cbBuf);
2139	AssertRC(rc);
2140	}
2141
2142	/**
2143	* \#PF Handler callback for virtual access handler ranges.
2144	*
2145	* Important to realize that a physical page in a range can have aliases, and
2146	* for ALL and WRITE handlers these will also trigger.
2147	*
2148	* @returns VINF_SUCCESS if the handler have carried out the operation.
2149	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
2150	* @param pVM Pointer to the VM.
2151	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
2152	* @param pvPtr The HC mapping of that address.
2153	* @param pvBuf What the guest is reading/writing.
2154	* @param cbBuf How much it's reading/writing.
2155	* @param enmAccessType The access type.
2156	* @param pvUser User argument.
2157	*/
2158	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
2159	{
2160	int rc;
2161
2162	Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
2163	Log(("CSAMCodePageWriteHandler: write to %RGv size=%zu\n", GCPtr, cbBuf));
2164	NOREF(pvUser);
2165
2166	if ( PAGE_ADDRESS(pvPtr) == PAGE_ADDRESS((uintptr_t)pvPtr + cbBuf - 1)
2167	&& !memcmp(pvPtr, pvBuf, cbBuf))
2168	{
2169	Log(("CSAMCodePageWriteHandler: dummy write -> ignore\n"));
2170	return VINF_PGM_HANDLER_DO_DEFAULT;
2171	}
2172
2173	if (VM_IS_EMT(pVM))
2174	rc = PATMR3PatchWrite(pVM, GCPtr, (uint32_t)cbBuf);
2175	else
2176	{
2177	/* Queue the write instead otherwise we'll get concurrency issues. */
2178	/** @note in theory not correct to let it write the data first before disabling a patch!
2179	* (if it writes the same data as the patch jump and we replace it with obsolete opcodes)
2180	*/
2181	Log(("CSAMCodePageWriteHandler: delayed write!\n"));
2182	AssertCompileSize(RTRCPTR, 4);
2183	rc = VMR3ReqCallVoidNoWait(pVM, VMCPUID_ANY, (PFNRT)CSAMDelayedWriteHandler, 3, pVM, (RTRCPTR)GCPtr, cbBuf);
2184	}
2185	AssertRC(rc);
2186
2187	return VINF_PGM_HANDLER_DO_DEFAULT;
2188	}
2189
2190	/**
2191	* \#PF Handler callback for invalidation of virtual access handler ranges.
2192	*
2193	* @param pVM Pointer to the VM.
2194	* @param GCPtr The virtual address the guest has changed.
2195	*/
2196	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr)
2197	{
2198	fInCSAMCodePageInvalidate = true;
2199	LogFlow(("CSAMCodePageInvalidate %RGv\n", GCPtr));
2200	/** @todo We can't remove the page (which unregisters the virtual handler) as we are called from a DoWithAll on the virtual handler tree. Argh. */
2201	csamFlushPage(pVM, GCPtr, false /* don't remove page! */);
2202	fInCSAMCodePageInvalidate = false;
2203	return VINF_SUCCESS;
2204	}
2205
2206	/**
2207	* Check if the current instruction has already been checked before
2208	*
2209	* @returns VBox status code. (trap handled or not)
2210	* @param pVM Pointer to the VM.
2211	* @param pInstr Instruction pointer
2212	* @param pPage CSAM patch structure pointer
2213	*/
2214	bool csamIsCodeScanned(PVM pVM, RTRCPTR pInstr, PCSAMPAGE *pPage)
2215	{
2216	PCSAMPAGEREC pPageRec;
2217	uint32_t offset;
2218
2219	STAM_PROFILE_START(&pVM->csam.s.StatTimeCheckAddr, a);
2220
2221	offset = pInstr & PAGE_OFFSET_MASK;
2222	pInstr = pInstr & PAGE_BASE_GC_MASK;
2223
2224	Assert(pPage);
2225
2226	if (pPage && (pPage)->pPageGC == pInstr)
2227	{
2228	if ((pPage)->pBitmap == NULL \|\| ASMBitTest((pPage)->pBitmap, offset))
2229	{
2230	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
2231	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2232	return true;
2233	}
2234	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2235	return false;
2236	}
2237
2238	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)pInstr);
2239	if (pPageRec)
2240	{
2241	if (pPage) *pPage= &pPageRec->page;
2242	if (pPageRec->page.pBitmap == NULL \|\| ASMBitTest(pPageRec->page.pBitmap, offset))
2243	{
2244	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
2245	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2246	return true;
2247	}
2248	}
2249	else
2250	{
2251	if (pPage) *pPage = NULL;
2252	}
2253	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2254	return false;
2255	}
2256
2257	/**
2258	* Mark an instruction in a page as scanned/not scanned
2259	*
2260	* @param pVM Pointer to the VM.
2261	* @param pPage Patch structure pointer
2262	* @param pInstr Instruction pointer
2263	* @param cbInstr Instruction size
2264	* @param fScanned Mark as scanned or not
2265	*/
2266	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTRCPTR pInstr, uint32_t cbInstr, bool fScanned)
2267	{
2268	LogFlow(("csamMarkCodeAsScanned %RRv cbInstr=%d\n", pInstr, cbInstr));
2269	CSAMMarkPage(pVM, pInstr, fScanned);
2270
2271	/** @todo should recreate empty bitmap if !fScanned */
2272	if (pPage->pBitmap == NULL)
2273	return;
2274
2275	if (fScanned)
2276	{
2277	// retn instructions can be scanned more than once
2278	if (ASMBitTest(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK) == 0)
2279	{
2280	pPage->uSize += cbInstr;
2281	STAM_COUNTER_ADD(&pVM->csam.s.StatNrInstr, 1);
2282	}
2283	if (pPage->uSize >= PAGE_SIZE)
2284	{
2285	Log(("Scanned full page (%RRv) -> free bitmap\n", pInstr & PAGE_BASE_GC_MASK));
2286	MMR3HeapFree(pPage->pBitmap);
2287	pPage->pBitmap = NULL;
2288	}
2289	else
2290	ASMBitSet(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2291	}
2292	else
2293	ASMBitClear(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2294	}
2295
2296	/**
2297	* Mark an instruction in a page as scanned/not scanned
2298	*
2299	* @returns VBox status code.
2300	* @param pVM Pointer to the VM.
2301	* @param pInstr Instruction pointer
2302	* @param cbInstr Instruction size
2303	* @param fScanned Mark as scanned or not
2304	*/
2305	VMMR3_INT_DECL(int) CSAMR3MarkCode(PVM pVM, RTRCPTR pInstr, uint32_t cbInstr, bool fScanned)
2306	{
2307	PCSAMPAGE pPage = 0;
2308
2309	Assert(!fScanned); /* other case not implemented. */
2310	Assert(!PATMIsPatchGCAddr(pVM, pInstr));
2311	Assert(!HMIsEnabled(pVM));
2312
2313	if (csamIsCodeScanned(pVM, pInstr, &pPage) == false)
2314	{
2315	Assert(fScanned == true); /* other case should not be possible */
2316	return VINF_SUCCESS;
2317	}
2318
2319	Log(("CSAMR3MarkCode: %RRv size=%d fScanned=%d\n", pInstr, cbInstr, fScanned));
2320	csamMarkCode(pVM, pPage, pInstr, cbInstr, fScanned);
2321	return VINF_SUCCESS;
2322	}
2323
2324
2325	/**
2326	* Scan and analyse code
2327	*
2328	* @returns VBox status code.
2329	* @param pVM Pointer to the VM.
2330	* @param pCtxCore CPU context
2331	* @param pInstrGC Instruction pointer
2332	*/
2333	VMMR3_INT_DECL(int) CSAMR3CheckCodeEx(PVM pVM, PCPUMCTXCORE pCtxCore, RTRCPTR pInstrGC)
2334	{
2335	Assert(!HMIsEnabled(pVM));
2336	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2337	{
2338	// No use
2339	return VINF_SUCCESS;
2340	}
2341
2342	if (CSAMIsEnabled(pVM))
2343	{
2344	/* Assuming 32 bits code for now. */
2345	Assert(CPUMGetGuestCodeBits(VMMGetCpu0(pVM)) == 32);
2346
2347	pInstrGC = SELMToFlat(pVM, DISSELREG_CS, pCtxCore, pInstrGC);
2348	return CSAMR3CheckCode(pVM, pInstrGC);
2349	}
2350	return VINF_SUCCESS;
2351	}
2352
2353	/**
2354	* Scan and analyse code
2355	*
2356	* @returns VBox status code.
2357	* @param pVM Pointer to the VM.
2358	* @param pInstrGC Instruction pointer (0:32 virtual address)
2359	*/
2360	VMMR3_INT_DECL(int) CSAMR3CheckCode(PVM pVM, RTRCPTR pInstrGC)
2361	{
2362	int rc;
2363	PCSAMPAGE pPage = NULL;
2364	Assert(!HMIsEnabled(pVM));
2365
2366	if ( EMIsRawRing0Enabled(pVM) == false
2367	\|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2368	{
2369	/* Not active. */
2370	return VINF_SUCCESS;
2371	}
2372
2373	if (CSAMIsEnabled(pVM))
2374	{
2375	/* Cache record for csamR3GCVirtToHCVirt */
2376	CSAMP2GLOOKUPREC cacheRec;
2377	RT_ZERO(cacheRec);
2378
2379	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2380	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, pInstrGC, true /* 32 bits code */, CSAMR3AnalyseCallback, pPage, &cacheRec);
2381	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2382	if (cacheRec.Lock.pvMap)
2383	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
2384
2385	if (rc != VINF_SUCCESS)
2386	{
2387	Log(("csamAnalyseCodeStream failed with %d\n", rc));
2388	return rc;
2389	}
2390	}
2391	return VINF_SUCCESS;
2392	}
2393
2394	/**
2395	* Flush dirty code pages
2396	*
2397	* @returns VBox status code.
2398	* @param pVM Pointer to the VM.
2399	*/
2400	static int csamR3FlushDirtyPages(PVM pVM)
2401	{
2402	Assert(pVM->cCpus == 1);
2403	PVMCPU pVCpu = VMMGetCpu0(pVM);
2404
2405	STAM_PROFILE_START(&pVM->csam.s.StatFlushDirtyPages, a);
2406
2407	for (uint32_t i=0;i<pVM->csam.s.cDirtyPages;i++)
2408	{
2409	int rc;
2410	PCSAMPAGEREC pPageRec;
2411	RTRCPTR GCPtr = pVM->csam.s.pvDirtyBasePage[i];
2412
2413	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2414
2415	#ifdef VBOX_WITH_REM
2416	/* Notify the recompiler that this page has been changed. */
2417	REMR3NotifyCodePageChanged(pVM, pVCpu, GCPtr);
2418	#endif
2419
2420	/* Enable write protection again. (use the fault address as it might be an alias) */
2421	rc = PGMShwMakePageReadonly(pVCpu, pVM->csam.s.pvDirtyFaultPage[i], 0 /fFlags/);
2422	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2423
2424	Log(("CSAMR3FlushDirtyPages: flush %RRv (modifypage rc=%Rrc)\n", pVM->csam.s.pvDirtyBasePage[i], rc));
2425
2426	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)(uintptr_t)GCPtr);
2427	if (pPageRec && pPageRec->page.enmTag == CSAM_TAG_REM)
2428	{
2429	uint64_t fFlags;
2430
2431	rc = PGMGstGetPage(pVCpu, GCPtr, &fFlags, NULL);
2432	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Rrc\n", rc));
2433	if ( rc == VINF_SUCCESS
2434	&& (fFlags & X86_PTE_US))
2435	{
2436	/* We don't care about user pages. */
2437	csamRemovePageRecord(pVM, GCPtr);
2438	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
2439	}
2440	}
2441	}
2442	pVM->csam.s.cDirtyPages = 0;
2443	STAM_PROFILE_STOP(&pVM->csam.s.StatFlushDirtyPages, a);
2444	return VINF_SUCCESS;
2445	}
2446
2447	/**
2448	* Flush potential new code pages
2449	*
2450	* @returns VBox status code.
2451	* @param pVM Pointer to the VM.
2452	*/
2453	static int csamR3FlushCodePages(PVM pVM)
2454	{
2455	Assert(pVM->cCpus == 1);
2456	PVMCPU pVCpu = VMMGetCpu0(pVM);
2457
2458	for (uint32_t i=0;i<pVM->csam.s.cPossibleCodePages;i++)
2459	{
2460	RTRCPTR GCPtr = pVM->csam.s.pvPossibleCodePage[i];
2461
2462	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2463
2464	Log(("csamR3FlushCodePages: %RRv\n", GCPtr));
2465	PGMShwMakePageNotPresent(pVCpu, GCPtr, 0 /fFlags/);
2466	/* Resync the page to make sure instruction fetch will fault */
2467	CSAMMarkPage(pVM, GCPtr, false);
2468	}
2469	pVM->csam.s.cPossibleCodePages = 0;
2470	return VINF_SUCCESS;
2471	}
2472
2473	/**
2474	* Perform any pending actions
2475	*
2476	* @returns VBox status code.
2477	* @param pVM Pointer to the VM.
2478	* @param pVCpu Pointer to the VMCPU.
2479	*/
2480	VMMR3_INT_DECL(int) CSAMR3DoPendingAction(PVM pVM, PVMCPU pVCpu)
2481	{
2482	AssertReturn(!HMIsEnabled(pVM), VERR_CSAM_HM_IPE);
2483
2484	csamR3FlushDirtyPages(pVM);
2485	csamR3FlushCodePages(pVM);
2486
2487	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_CSAM_PENDING_ACTION);
2488	return VINF_SUCCESS;
2489	}
2490
2491	/**
2492	* Analyse interrupt and trap gates
2493	*
2494	* @returns VBox status code.
2495	* @param pVM Pointer to the VM.
2496	* @param iGate Start gate
2497	* @param cGates Number of gates to check
2498	*/
2499	VMMR3_INT_DECL(int) CSAMR3CheckGates(PVM pVM, uint32_t iGate, uint32_t cGates)
2500	{
2501	#ifdef VBOX_WITH_RAW_MODE
2502	Assert(pVM->cCpus == 1);
2503	PVMCPU pVCpu = VMMGetCpu0(pVM);
2504	uint16_t cbIDT;
2505	RTRCPTR GCPtrIDT = CPUMGetGuestIDTR(pVCpu, &cbIDT);
2506	uint32_t iGateEnd;
2507	uint32_t maxGates;
2508	VBOXIDTE aIDT[256];
2509	PVBOXIDTE pGuestIdte;
2510	int rc;
2511
2512	AssertReturn(!HMIsEnabled(pVM), VERR_CSAM_HM_IPE);
2513	if (EMIsRawRing0Enabled(pVM) == false)
2514	{
2515	/* Enabling interrupt gates only works when raw ring 0 is enabled. */
2516	//AssertFailed();
2517	return VINF_SUCCESS;
2518	}
2519
2520	/* We only check all gates once during a session */
2521	if ( !pVM->csam.s.fGatesChecked
2522	&& cGates != 256)
2523	return VINF_SUCCESS; /* too early */
2524
2525	/* We only check all gates once during a session */
2526	if ( pVM->csam.s.fGatesChecked
2527	&& cGates != 1)
2528	return VINF_SUCCESS; /* ignored */
2529
2530	Assert(cGates <= 256);
2531	if (!GCPtrIDT \|\| cGates > 256)
2532	return VERR_INVALID_PARAMETER;
2533
2534	if (cGates != 1)
2535	{
2536	pVM->csam.s.fGatesChecked = true;
2537	for (unsigned i=0;i<RT_ELEMENTS(pVM->csam.s.pvCallInstruction);i++)
2538	{
2539	RTRCPTR pHandler = pVM->csam.s.pvCallInstruction[i];
2540
2541	if (pHandler)
2542	{
2543	PCSAMPAGE pPage = NULL;
2544	CSAMP2GLOOKUPREC cacheRec; /* Cache record for csamR3GCVirtToHCVirt. */
2545	RT_ZERO(cacheRec);
2546
2547	Log(("CSAMCheckGates: checking previous call instruction %RRv\n", pHandler));
2548	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2549	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2550	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2551	if (cacheRec.Lock.pvMap)
2552	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
2553
2554	if (rc != VINF_SUCCESS)
2555	{
2556	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2557	continue;
2558	}
2559	}
2560	}
2561	}
2562
2563	/* Determine valid upper boundary. */
2564	maxGates = (cbIDT+1) / sizeof(VBOXIDTE);
2565	Assert(iGate < maxGates);
2566	if (iGate > maxGates)
2567	return VERR_INVALID_PARAMETER;
2568
2569	if (iGate + cGates > maxGates)
2570	cGates = maxGates - iGate;
2571
2572	GCPtrIDT = GCPtrIDT + iGate * sizeof(VBOXIDTE);
2573	iGateEnd = iGate + cGates;
2574
2575	STAM_PROFILE_START(&pVM->csam.s.StatCheckGates, a);
2576
2577	/*
2578	* Get IDT entries.
2579	*/
2580	rc = PGMPhysSimpleReadGCPtr(pVCpu, aIDT, GCPtrIDT, cGates*sizeof(VBOXIDTE));
2581	if (RT_FAILURE(rc))
2582	{
2583	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Rrc\n", rc));
2584	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2585	return rc;
2586	}
2587	pGuestIdte = &aIDT[0];
2588
2589	for (/iGate/; iGate<iGateEnd; iGate++, pGuestIdte++)
2590	{
2591	Assert(TRPMR3GetGuestTrapHandler(pVM, iGate) == TRPM_INVALID_HANDLER);
2592
2593	if ( pGuestIdte->Gen.u1Present
2594	&& (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
2595	&& (pGuestIdte->Gen.u2DPL == 3 \|\| pGuestIdte->Gen.u2DPL == 0)
2596	)
2597	{
2598	RTRCPTR pHandler;
2599	PCSAMPAGE pPage = NULL;
2600	DBGFSELINFO selInfo;
2601	CSAMP2GLOOKUPREC cacheRec; /* Cache record for csamR3GCVirtToHCVirt. */
2602	RT_ZERO(cacheRec);
2603
2604	pHandler = VBOXIDTE_OFFSET(*pGuestIdte);
2605	pHandler = SELMToFlatBySel(pVM, pGuestIdte->Gen.u16SegSel, pHandler);
2606
2607	rc = SELMR3GetSelectorInfo(pVM, pVCpu, pGuestIdte->Gen.u16SegSel, &selInfo);
2608	if ( RT_FAILURE(rc)
2609	\|\| (selInfo.fFlags & (DBGFSELINFO_FLAGS_NOT_PRESENT \| DBGFSELINFO_FLAGS_INVALID))
2610	\|\| selInfo.GCPtrBase != 0
2611	\|\| selInfo.cbLimit != ~0U
2612	)
2613	{
2614	/* Refuse to patch a handler whose idt cs selector isn't wide open. */
2615	Log(("CSAMCheckGates: check gate %d failed due to rc %Rrc GCPtrBase=%RRv limit=%x\n", iGate, rc, selInfo.GCPtrBase, selInfo.cbLimit));
2616	continue;
2617	}
2618
2619
2620	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2621	{
2622	Log(("CSAMCheckGates: check trap gate %d at %04X:%08X (flat %RRv)\n", iGate, pGuestIdte->Gen.u16SegSel, VBOXIDTE_OFFSET(*pGuestIdte), pHandler));
2623	}
2624	else
2625	{
2626	Log(("CSAMCheckGates: check interrupt gate %d at %04X:%08X (flat %RRv)\n", iGate, pGuestIdte->Gen.u16SegSel, VBOXIDTE_OFFSET(*pGuestIdte), pHandler));
2627	}
2628
2629	STAM_PROFILE_START(&pVM->csam.s.StatTime, b);
2630	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2631	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, b);
2632	if (cacheRec.Lock.pvMap)
2633	PGMPhysReleasePageMappingLock(pVM, &cacheRec.Lock);
2634
2635	if (rc != VINF_SUCCESS)
2636	{
2637	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2638	continue;
2639	}
2640	/* OpenBSD guest specific patch test. */
2641	if (iGate >= 0x20)
2642	{
2643	PCPUMCTX pCtx;
2644	DISCPUSTATE cpu;
2645	RTGCUINTPTR32 aOpenBsdPushCSOffset[3] = {0x03, /* OpenBSD 3.7 & 3.8 */
2646	0x2B, /* OpenBSD 4.0 installation ISO */
2647	0x2F}; /* OpenBSD 4.0 after install */
2648
2649	pCtx = CPUMQueryGuestCtxPtr(pVCpu);
2650
2651	for (unsigned i=0;i<RT_ELEMENTS(aOpenBsdPushCSOffset);i++)
2652	{
2653	rc = CPUMR3DisasmInstrCPU(pVM, pVCpu, pCtx, pHandler - aOpenBsdPushCSOffset[i], &cpu, NULL);
2654	if ( rc == VINF_SUCCESS
2655	&& cpu.pCurInstr->uOpcode == OP_PUSH
2656	&& cpu.pCurInstr->fParam1 == OP_PARM_REG_CS)
2657	{
2658	rc = PATMR3InstallPatch(pVM, pHandler - aOpenBsdPushCSOffset[i], PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2659	if (RT_SUCCESS(rc))
2660	Log(("Installed OpenBSD interrupt handler prefix instruction (push cs) patch\n"));
2661	}
2662	}
2663	}
2664
2665	/* Trap gates and certain interrupt gates. */
2666	uint32_t fPatchFlags = PATMFL_CODE32 \| PATMFL_IDTHANDLER;
2667
2668	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2669	fPatchFlags \|= PATMFL_TRAPHANDLER;
2670	else
2671	fPatchFlags \|= PATMFL_INTHANDLER;
2672
2673	switch (iGate) {
2674	case 8:
2675	case 10:
2676	case 11:
2677	case 12:
2678	case 13:
2679	case 14:
2680	case 17:
2681	fPatchFlags \|= PATMFL_TRAPHANDLER_WITH_ERRORCODE;
2682	break;
2683	default:
2684	/* No error code. */
2685	break;
2686	}
2687
2688	Log(("Installing %s gate handler for 0x%X at %RRv\n", (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32) ? "trap" : "intr", iGate, pHandler));
2689
2690	rc = PATMR3InstallPatch(pVM, pHandler, fPatchFlags);
2691	if ( RT_SUCCESS(rc)
2692	\|\| rc == VERR_PATM_ALREADY_PATCHED)
2693	{
2694	Log(("Gate handler 0x%X is SAFE!\n", iGate));
2695
2696	RTRCPTR pNewHandlerGC = PATMR3QueryPatchGCPtr(pVM, pHandler);
2697	if (pNewHandlerGC)
2698	{
2699	rc = TRPMR3SetGuestTrapHandler(pVM, iGate, pNewHandlerGC);
2700	if (RT_FAILURE(rc))
2701	Log(("TRPMR3SetGuestTrapHandler %d failed with %Rrc\n", iGate, rc));
2702	}
2703	}
2704	}
2705	} /* for */
2706	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2707	#endif /* VBOX_WITH_RAW_MODE */
2708	return VINF_SUCCESS;
2709	}
2710
2711	/**
2712	* Record previous call instruction addresses
2713	*
2714	* @returns VBox status code.
2715	* @param pVM Pointer to the VM.
2716	* @param GCPtrCall Call address
2717	*/
2718	VMMR3DECL(int) CSAMR3RecordCallAddress(PVM pVM, RTRCPTR GCPtrCall)
2719	{
2720	Assert(!HMIsEnabled(pVM));
2721	for (unsigned i=0;i<RT_ELEMENTS(pVM->csam.s.pvCallInstruction);i++)
2722	{
2723	if (pVM->csam.s.pvCallInstruction[i] == GCPtrCall)
2724	return VINF_SUCCESS;
2725	}
2726
2727	Log(("CSAMR3RecordCallAddress %RRv\n", GCPtrCall));
2728
2729	pVM->csam.s.pvCallInstruction[pVM->csam.s.iCallInstruction++] = GCPtrCall;
2730	if (pVM->csam.s.iCallInstruction >= RT_ELEMENTS(pVM->csam.s.pvCallInstruction))
2731	pVM->csam.s.iCallInstruction = 0;
2732
2733	return VINF_SUCCESS;
2734	}
2735
2736
2737	/**
2738	* Query CSAM state (enabled/disabled)
2739	*
2740	* @returns true if enabled, false otherwise.
2741	* @param pUVM The user mode VM handle.
2742	*/
2743	VMMR3DECL(bool) CSAMR3IsEnabled(PUVM pUVM)
2744	{
2745	UVM_ASSERT_VALID_EXT_RETURN(pUVM, false);
2746	PVM pVM = pUVM->pVM;
2747	VM_ASSERT_VALID_EXT_RETURN(pVM, false);
2748	return CSAMIsEnabled(pVM);
2749	}
2750
2751
2752	/**
2753	* Enables or disables code scanning.
2754	*
2755	* @returns VBox status code.
2756	* @param pUVM The user mode VM handle.
2757	* @param fEnabled Whether to enable or disable scanning.
2758	*/
2759	VMMR3DECL(int) CSAMR3SetScanningEnabled(PUVM pUVM, bool fEnabled)
2760	{
2761	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
2762	PVM pVM = pUVM->pVM;
2763	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
2764
2765	if (HMIsEnabled(pVM))
2766	{
2767	Assert(!pVM->fCSAMEnabled);
2768	return VINF_SUCCESS;
2769	}
2770
2771	int rc;
2772	if (fEnabled)
2773	rc = CSAMEnableScanning(pVM);
2774	else
2775	rc = CSAMDisableScanning(pVM);
2776	return rc;
2777	}
2778
2779
2780	#ifdef VBOX_WITH_DEBUGGER
2781
2782	/**
2783	* @callback_method_impl{FNDBGCCMD, The '.csamoff' command.}
2784	*/
2785	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
2786	{
2787	DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM);
2788	NOREF(cArgs); NOREF(paArgs);
2789
2790	if (HMR3IsEnabled(pUVM))
2791	return DBGCCmdHlpPrintf(pCmdHlp, "CSAM is permanently disabled by HM.\n");
2792
2793	int rc = CSAMR3SetScanningEnabled(pUVM, false);
2794	if (RT_FAILURE(rc))
2795	return DBGCCmdHlpFailRc(pCmdHlp, pCmd, rc, "CSAMR3SetScanningEnabled");
2796	return DBGCCmdHlpPrintf(pCmdHlp, "CSAM Scanning disabled\n");
2797	}
2798
2799	/**
2800	* @callback_method_impl{FNDBGCCMD, The '.csamon' command.}
2801	*/
2802	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PUVM pUVM, PCDBGCVAR paArgs, unsigned cArgs)
2803	{
2804	DBGC_CMDHLP_REQ_UVM_RET(pCmdHlp, pCmd, pUVM);
2805	NOREF(cArgs); NOREF(paArgs);
2806
2807	if (HMR3IsEnabled(pUVM))
2808	return DBGCCmdHlpPrintf(pCmdHlp, "CSAM is permanently disabled by HM.\n");
2809
2810	int rc = CSAMR3SetScanningEnabled(pUVM, true);
2811	if (RT_FAILURE(rc))
2812	return DBGCCmdHlpFailRc(pCmdHlp, pCmd, rc, "CSAMR3SetScanningEnabled");
2813	return DBGCCmdHlpPrintf(pCmdHlp, "CSAM Scanning enabled\n");
2814	}
2815
2816	#endif /* VBOX_WITH_DEBUGGER */

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source: vbox/trunk/src/VBox/VMM/VMMR3/CSAM.cpp@ 53349

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