SELM.cpp@ 29566

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1	/* $Id: SELM.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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	/** @page pg_selm SELM - The Selector Manager
19	*
20	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
21	* of a few hyper selector for the raw-mode context. In the hardware assisted
22	* virtualization mode its only task is to decode entries in the guest GDT or
23	* LDT once in a while.
24	*
25	* @see grp_selm
26	*
27	*
28	* @section seg_selm_shadowing Shadowing
29	*
30	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
31	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
32	* The idea is to do it in a more on-demand fashion when we get time. There
33	* also a whole bunch of issues with the current synchronization of all three
34	* tables, see notes and todos in the code.
35	*
36	* When the guest makes changes to the GDT we will try update the shadow copy
37	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
38	*
39	* When the guest make LDT changes we'll trigger a full resync of the LDT
40	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
41	*
42	* The TSS shadowing is limited to the fields we need to care about, namely SS0
43	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
44	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
45	* rather than go the SELMR3SyncTSS() route.
46	*
47	* When in raw-mode SELM also injects a few extra GDT selectors which are used
48	* by the raw-mode (hyper) context. These start their life at the high end of
49	* the table and will be relocated when the guest tries to make use of them...
50	* Well, that was that idea at least, only the code isn't quite there yet which
51	* is why we have trouble with guests which actually have a full sized GDT.
52	*
53	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
54	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
55	*
56	*/
57
58	/*******************************************************************************
59	* Header Files *
60	*******************************************************************************/
61	#define LOG_GROUP LOG_GROUP_SELM
62	#include <VBox/selm.h>
63	#include <VBox/cpum.h>
64	#include <VBox/stam.h>
65	#include <VBox/mm.h>
66	#include <VBox/ssm.h>
67	#include <VBox/pgm.h>
68	#include <VBox/trpm.h>
69	#include <VBox/dbgf.h>
70	#include "SELMInternal.h"
71	#include <VBox/vm.h>
72	#include <VBox/err.h>
73	#include <VBox/param.h>
74
75	#include <iprt/assert.h>
76	#include <VBox/log.h>
77	#include <iprt/asm.h>
78	#include <iprt/string.h>
79	#include <iprt/thread.h>
80	#include <iprt/string.h>
81
82
83	/**
84	* Enable or disable tracking of Guest's GDT/LDT/TSS.
85	* @{
86	*/
87	#define SELM_TRACK_GUEST_GDT_CHANGES
88	#define SELM_TRACK_GUEST_LDT_CHANGES
89	#define SELM_TRACK_GUEST_TSS_CHANGES
90	/** @} */
91
92	/**
93	* Enable or disable tracking of Shadow GDT/LDT/TSS.
94	* @{
95	*/
96	#define SELM_TRACK_SHADOW_GDT_CHANGES
97	#define SELM_TRACK_SHADOW_LDT_CHANGES
98	#define SELM_TRACK_SHADOW_TSS_CHANGES
99	/** @} */
100
101
102	/** SELM saved state version. */
103	#define SELM_SAVED_STATE_VERSION 5
104
105
106	/*******************************************************************************
107	* Internal Functions *
108	*******************************************************************************/
109	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
110	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
111	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
112	static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
113	static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
114	static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
115	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
116	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
117	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
118	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
119	//static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
120	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
121
122
123
124	/**
125	* Initializes the SELM.
126	*
127	* @returns VBox status code.
128	* @param pVM The VM to operate on.
129	*/
130	VMMR3DECL(int) SELMR3Init(PVM pVM)
131	{
132	LogFlow(("SELMR3Init\n"));
133
134	/*
135	* Assert alignment and sizes.
136	* (The TSS block requires contiguous back.)
137	*/
138	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
139	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
140	#if 0 /* doesn't work */
141	AssertCompile((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
142	AssertCompile((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
143	#endif
144	AssertRelease((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
145	AssertRelease((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
146	AssertRelease(sizeof(pVM->selm.s.Tss.IntRedirBitmap) == 0x20);
147
148	/*
149	* Init the structure.
150	*/
151	pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
152	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = (SELM_GDT_ELEMENTS - 0x1) << 3;
153	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = (SELM_GDT_ELEMENTS - 0x2) << 3;
154	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = (SELM_GDT_ELEMENTS - 0x3) << 3;
155	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = (SELM_GDT_ELEMENTS - 0x4) << 3;
156	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = (SELM_GDT_ELEMENTS - 0x5) << 3;
157
158	/*
159	* Allocate GDT table.
160	*/
161	int rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtR3[0]) * SELM_GDT_ELEMENTS,
162	PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtR3);
163	AssertRCReturn(rc, rc);
164
165	/*
166	* Allocate LDT area.
167	*/
168	rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.pvLdtR3);
169	AssertRCReturn(rc, rc);
170
171	/*
172	* Init Guest's and Shadow GDT, LDT, TSS changes control variables.
173	*/
174	pVM->selm.s.cbEffGuestGdtLimit = 0;
175	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
176	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
177	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
178
179	pVM->selm.s.paGdtRC = NIL_RTRCPTR; /* Must be set in SELMR3Relocate because of monitoring. */
180	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
181	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
182	pVM->selm.s.GCSelTss = RTSEL_MAX;
183
184	pVM->selm.s.fDisableMonitoring = false;
185	pVM->selm.s.fSyncTSSRing0Stack = false;
186
187	/* The I/O bitmap starts right after the virtual interrupt redirection bitmap. Outside the TSS on purpose; the CPU will not check it
188	* for I/O operations. */
189	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
190	/* bit set to 1 means no redirection */
191	memset(pVM->selm.s.Tss.IntRedirBitmap, 0xff, sizeof(pVM->selm.s.Tss.IntRedirBitmap));
192
193	/*
194	* Register the saved state data unit.
195	*/
196	rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
197	NULL, NULL, NULL,
198	NULL, selmR3Save, NULL,
199	NULL, selmR3Load, selmR3LoadDone);
200	if (RT_FAILURE(rc))
201	return rc;
202
203	/*
204	* Statistics.
205	*/
206	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestGDTHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest GDT.");
207	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestGDTUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest GDT.");
208	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestLDT, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/LDT", STAMUNIT_OCCURENCES, "The number of writes to the Guest LDT was detected.");
209	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS.");
210	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSRedir, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSRedir",STAMUNIT_OCCURENCES, "The number of handled redir bitmap writes to the Guest TSS.");
211	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSHandledChanged,STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSIntChg", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS where the R0 stack changed.");
212	STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest TSS.");
213	STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
214	STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
215
216	STAM_REG(pVM, &pVM->selm.s.StatHyperSelsChanged, STAMTYPE_COUNTER, "/SELM/HyperSels/Changed", STAMUNIT_OCCURENCES, "The number of times we had to relocate our hypervisor selectors.");
217	STAM_REG(pVM, &pVM->selm.s.StatScanForHyperSels, STAMTYPE_COUNTER, "/SELM/HyperSels/Scan", STAMUNIT_OCCURENCES, "The number of times we had find free hypervisor selectors.");
218
219	/*
220	* Default action when entering raw mode for the first time
221	*/
222	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
223	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
224	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
225	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
226
227	/*
228	* Register info handlers.
229	*/
230	DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
231	DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
232	DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
233	DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
234	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
235	//DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
236
237	return rc;
238	}
239
240
241	/**
242	* Finalizes HMA page attributes.
243	*
244	* @returns VBox status code.
245	* @param pVM The VM handle.
246	*/
247	VMMR3DECL(int) SELMR3InitFinalize(PVM pVM)
248	{
249	/** @cfgm{/DoubleFault,bool,false}
250	* Enables catching of double faults in the raw-mode context VMM code. This can
251	* be used when the tripple faults or hangs occure and one suspect an unhandled
252	* double fault. This is not enabled by default because it means making the
253	* hyper selectors writeable for all supervisor code, including the guest's.
254	* The double fault is a task switch and thus requires write access to the GDT
255	* of the TSS (to set it busy), to the old TSS (to store state), and to the Trap
256	* 8 TSS for the back link.
257	*/
258	bool f;
259	#if defined(DEBUG_bird)
260	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, true);
261	#else
262	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, false);
263	#endif
264	AssertLogRelRCReturn(rc, rc);
265	if (f)
266	{
267	PX86DESC paGdt = pVM->selm.s.paGdtR3;
268	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3]), sizeof(paGdt[0]),
269	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
270	AssertRC(rc);
271	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3]), sizeof(paGdt[0]),
272	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
273	AssertRC(rc);
274	rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]),
275	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
276	AssertRC(rc);
277	rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]),
278	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
279	AssertRC(rc);
280	}
281	return VINF_SUCCESS;
282	}
283
284
285	/**
286	* Setup the hypervisor GDT selectors in our shadow table
287	*
288	* @param pVM The VM handle.
289	*/
290	static void selmR3SetupHyperGDTSelectors(PVM pVM)
291	{
292	PX86DESC paGdt = pVM->selm.s.paGdtR3;
293
294	/*
295	* Set up global code and data descriptors for use in the guest context.
296	* Both are wide open (base 0, limit 4GB)
297	*/
298	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> 3];
299	pDesc->Gen.u16LimitLow = 0xffff;
300	pDesc->Gen.u4LimitHigh = 0xf;
301	pDesc->Gen.u16BaseLow = 0;
302	pDesc->Gen.u8BaseHigh1 = 0;
303	pDesc->Gen.u8BaseHigh2 = 0;
304	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
305	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
306	pDesc->Gen.u2Dpl = 0; /* supervisor */
307	pDesc->Gen.u1Present = 1;
308	pDesc->Gen.u1Available = 0;
309	pDesc->Gen.u1Long = 0;
310	pDesc->Gen.u1DefBig = 1; /* def 32 bit */
311	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
312
313	/* data */
314	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> 3];
315	pDesc->Gen.u16LimitLow = 0xffff;
316	pDesc->Gen.u4LimitHigh = 0xf;
317	pDesc->Gen.u16BaseLow = 0;
318	pDesc->Gen.u8BaseHigh1 = 0;
319	pDesc->Gen.u8BaseHigh2 = 0;
320	pDesc->Gen.u4Type = X86_SEL_TYPE_RW_ACC;
321	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
322	pDesc->Gen.u2Dpl = 0; /* supervisor */
323	pDesc->Gen.u1Present = 1;
324	pDesc->Gen.u1Available = 0;
325	pDesc->Gen.u1Long = 0;
326	pDesc->Gen.u1DefBig = 1; /* big */
327	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
328
329	/* 64-bit mode code (& data?) */
330	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> 3];
331	pDesc->Gen.u16LimitLow = 0xffff;
332	pDesc->Gen.u4LimitHigh = 0xf;
333	pDesc->Gen.u16BaseLow = 0;
334	pDesc->Gen.u8BaseHigh1 = 0;
335	pDesc->Gen.u8BaseHigh2 = 0;
336	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
337	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
338	pDesc->Gen.u2Dpl = 0; /* supervisor */
339	pDesc->Gen.u1Present = 1;
340	pDesc->Gen.u1Available = 0;
341	pDesc->Gen.u1Long = 1; /* The Long (L) attribute bit. */
342	pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
343	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
344
345	/*
346	* TSS descriptor
347	*/
348	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
349	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
350	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
351	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
352	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
353	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
354	pDesc->Gen.u4LimitHigh = 0;
355	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
356	pDesc->Gen.u1DescType = 0; /* system */
357	pDesc->Gen.u2Dpl = 0; /* supervisor */
358	pDesc->Gen.u1Present = 1;
359	pDesc->Gen.u1Available = 0;
360	pDesc->Gen.u1Long = 0;
361	pDesc->Gen.u1DefBig = 0;
362	pDesc->Gen.u1Granularity = 0; /* byte limit */
363
364	/*
365	* TSS descriptor for trap 08
366	*/
367	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3];
368	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
369	pDesc->Gen.u4LimitHigh = 0;
370	RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.TssTrap08);
371	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
372	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
373	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
374	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
375	pDesc->Gen.u1DescType = 0; /* system */
376	pDesc->Gen.u2Dpl = 0; /* supervisor */
377	pDesc->Gen.u1Present = 1;
378	pDesc->Gen.u1Available = 0;
379	pDesc->Gen.u1Long = 0;
380	pDesc->Gen.u1DefBig = 0;
381	pDesc->Gen.u1Granularity = 0; /* byte limit */
382	}
383
384	/**
385	* Applies relocations to data and code managed by this
386	* component. This function will be called at init and
387	* whenever the VMM need to relocate it self inside the GC.
388	*
389	* @param pVM The VM.
390	*/
391	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
392	{
393	PX86DESC paGdt = pVM->selm.s.paGdtR3;
394	LogFlow(("SELMR3Relocate\n"));
395
396	for (VMCPUID i = 0; i < pVM->cCpus; i++)
397	{
398	PVMCPU pVCpu = &pVM->aCpus[i];
399
400	/*
401	* Update GDTR and selector.
402	*/
403	CPUMSetHyperGDTR(pVCpu, MMHyperR3ToRC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
404
405	/** @todo selector relocations should be a seperate operation? */
406	CPUMSetHyperCS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]);
407	CPUMSetHyperDS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
408	CPUMSetHyperES(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
409	CPUMSetHyperSS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
410	CPUMSetHyperTR(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]);
411	}
412
413	selmR3SetupHyperGDTSelectors(pVM);
414
415	/** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
416	/** @todo PGM knows the proper CR3 values these days, not CPUM. */
417	/*
418	* Update the TSSes.
419	*/
420	/* Only applies to raw mode which supports only 1 VCPU */
421	PVMCPU pVCpu = &pVM->aCpus[0];
422
423	/* Current TSS */
424	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
425	pVM->selm.s.Tss.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
426	pVM->selm.s.Tss.esp0 = VMMGetStackRC(pVM);
427	pVM->selm.s.Tss.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
428	pVM->selm.s.Tss.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
429	pVM->selm.s.Tss.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
430	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
431
432	/* trap 08 */
433	pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu); /* this should give use better survival chances. */
434	pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
435	pVM->selm.s.TssTrap08.ss = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
436	pVM->selm.s.TssTrap08.esp0 = VMMGetStackRC(pVM) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
437	pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
438	pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
439	pVM->selm.s.TssTrap08.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
440	pVM->selm.s.TssTrap08.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
441	pVM->selm.s.TssTrap08.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
442	pVM->selm.s.TssTrap08.fs = 0;
443	pVM->selm.s.TssTrap08.gs = 0;
444	pVM->selm.s.TssTrap08.selLdt = 0;
445	pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
446	pVM->selm.s.TssTrap08.ecx = VM_RC_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
447	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
448	pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
449	pVM->selm.s.TssTrap08.edx = VM_RC_ADDR(pVM, pVM); /* setup edx VM address. */
450	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
451	pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
452	pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
453	/* TRPM will be updating the eip */
454
455	if (!pVM->selm.s.fDisableMonitoring)
456	{
457	/*
458	* Update shadow GDT/LDT/TSS write access handlers.
459	*/
460	int rc;
461	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
462	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
463	{
464	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
465	AssertRC(rc);
466	}
467	pVM->selm.s.paGdtRC = MMHyperR3ToRC(pVM, paGdt);
468	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.paGdtRC,
469	pVM->selm.s.paGdtRC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
470	0, 0, "selmRCShadowGDTWriteHandler", 0, "Shadow GDT write access handler");
471	AssertRC(rc);
472	#endif
473	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
474	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
475	{
476	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
477	AssertRC(rc);
478	}
479	pVM->selm.s.pvMonShwTssRC = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
480	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvMonShwTssRC,
481	pVM->selm.s.pvMonShwTssRC + sizeof(pVM->selm.s.Tss) - 1,
482	0, 0, "selmRCShadowTSSWriteHandler", 0, "Shadow TSS write access handler");
483	AssertRC(rc);
484	#endif
485
486	/*
487	* Update the GC LDT region handler and address.
488	*/
489	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
490	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
491	{
492	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
493	AssertRC(rc);
494	}
495	#endif
496	pVM->selm.s.pvLdtRC = MMHyperR3ToRC(pVM, pVM->selm.s.pvLdtR3);
497	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
498	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvLdtRC,
499	pVM->selm.s.pvLdtRC + _64K + PAGE_SIZE - 1,
500	0, 0, "selmRCShadowLDTWriteHandler", 0, "Shadow LDT write access handler");
501	AssertRC(rc);
502	#endif
503	}
504	}
505
506
507	/**
508	* Terminates the SELM.
509	*
510	* Termination means cleaning up and freeing all resources,
511	* the VM it self is at this point powered off or suspended.
512	*
513	* @returns VBox status code.
514	* @param pVM The VM to operate on.
515	*/
516	VMMR3DECL(int) SELMR3Term(PVM pVM)
517	{
518	return 0;
519	}
520
521
522	/**
523	* The VM is being reset.
524	*
525	* For the SELM component this means that any GDT/LDT/TSS monitors
526	* needs to be removed.
527	*
528	* @param pVM VM handle.
529	*/
530	VMMR3DECL(void) SELMR3Reset(PVM pVM)
531	{
532	LogFlow(("SELMR3Reset:\n"));
533	VM_ASSERT_EMT(pVM);
534
535	/*
536	* Uninstall guest GDT/LDT/TSS write access handlers.
537	*/
538	int rc;
539	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
540	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
541	{
542	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
543	AssertRC(rc);
544	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
545	pVM->selm.s.GuestGdtr.cbGdt = 0;
546	}
547	pVM->selm.s.fGDTRangeRegistered = false;
548	#endif
549	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
550	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
551	{
552	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
553	AssertRC(rc);
554	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
555	}
556	#endif
557	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
558	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
559	{
560	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
561	AssertRC(rc);
562	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
563	pVM->selm.s.GCSelTss = RTSEL_MAX;
564	}
565	#endif
566
567	/*
568	* Re-initialize other members.
569	*/
570	pVM->selm.s.cbLdtLimit = 0;
571	pVM->selm.s.offLdtHyper = 0;
572	pVM->selm.s.cbMonitoredGuestTss = 0;
573
574	pVM->selm.s.fSyncTSSRing0Stack = false;
575
576	/*
577	* Default action when entering raw mode for the first time
578	*/
579	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
580	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
581	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
582	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
583	}
584
585	/**
586	* Disable GDT/LDT/TSS monitoring and syncing
587	*
588	* @param pVM The VM to operate on.
589	*/
590	VMMR3DECL(void) SELMR3DisableMonitoring(PVM pVM)
591	{
592	/*
593	* Uninstall guest GDT/LDT/TSS write access handlers.
594	*/
595	int rc;
596	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
597	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
598	{
599	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
600	AssertRC(rc);
601	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
602	pVM->selm.s.GuestGdtr.cbGdt = 0;
603	}
604	pVM->selm.s.fGDTRangeRegistered = false;
605	#endif
606	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
607	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
608	{
609	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
610	AssertRC(rc);
611	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
612	}
613	#endif
614	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
615	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
616	{
617	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
618	AssertRC(rc);
619	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
620	pVM->selm.s.GCSelTss = RTSEL_MAX;
621	}
622	#endif
623
624	/*
625	* Unregister shadow GDT/LDT/TSS write access handlers.
626	*/
627	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
628	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
629	{
630	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
631	AssertRC(rc);
632	pVM->selm.s.paGdtRC = NIL_RTRCPTR;
633	}
634	#endif
635	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
636	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
637	{
638	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
639	AssertRC(rc);
640	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
641	}
642	#endif
643	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
644	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
645	{
646	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
647	AssertRC(rc);
648	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
649	}
650	#endif
651
652	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
653	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
654	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
655	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
656
657	pVM->selm.s.fDisableMonitoring = true;
658	}
659
660
661	/**
662	* Execute state save operation.
663	*
664	* @returns VBox status code.
665	* @param pVM VM Handle.
666	* @param pSSM SSM operation handle.
667	*/
668	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
669	{
670	LogFlow(("selmR3Save:\n"));
671
672	/*
673	* Save the basic bits - fortunately all the other things can be resynced on load.
674	*/
675	PSELM pSelm = &pVM->selm.s;
676
677	SSMR3PutBool(pSSM, pSelm->fDisableMonitoring);
678	SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
679	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS]);
680	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_DS]);
681	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]);
682	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]); /* reserved for DS64. */
683	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS]);
684	return SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]);
685	}
686
687
688	/**
689	* Execute state load operation.
690	*
691	* @returns VBox status code.
692	* @param pVM VM Handle.
693	* @param pSSM SSM operation handle.
694	* @param uVersion Data layout version.
695	* @param uPass The data pass.
696	*/
697	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
698	{
699	LogFlow(("selmR3Load:\n"));
700	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
701
702	/*
703	* Validate version.
704	*/
705	if (uVersion != SELM_SAVED_STATE_VERSION)
706	{
707	AssertMsgFailed(("selmR3Load: Invalid version uVersion=%d!\n", uVersion));
708	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
709	}
710
711	/*
712	* Do a reset.
713	*/
714	SELMR3Reset(pVM);
715
716	/* Get the monitoring flag. */
717	SSMR3GetBool(pSSM, &pVM->selm.s.fDisableMonitoring);
718
719	/* Get the TSS state flag. */
720	SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
721
722	/*
723	* Get the selectors.
724	*/
725	RTSEL SelCS;
726	SSMR3GetSel(pSSM, &SelCS);
727	RTSEL SelDS;
728	SSMR3GetSel(pSSM, &SelDS);
729	RTSEL SelCS64;
730	SSMR3GetSel(pSSM, &SelCS64);
731	RTSEL SelDS64;
732	SSMR3GetSel(pSSM, &SelDS64);
733	RTSEL SelTSS;
734	SSMR3GetSel(pSSM, &SelTSS);
735	RTSEL SelTSSTrap08;
736	SSMR3GetSel(pSSM, &SelTSSTrap08);
737
738	/* Copy the selectors; they will be checked during relocation. */
739	PSELM pSelm = &pVM->selm.s;
740	pSelm->aHyperSel[SELM_HYPER_SEL_CS] = SelCS;
741	pSelm->aHyperSel[SELM_HYPER_SEL_DS] = SelDS;
742	pSelm->aHyperSel[SELM_HYPER_SEL_CS64] = SelCS64;
743	pSelm->aHyperSel[SELM_HYPER_SEL_TSS] = SelTSS;
744	pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SelTSSTrap08;
745
746	return VINF_SUCCESS;
747	}
748
749
750	/**
751	* Sync the GDT, LDT and TSS after loading the state.
752	*
753	* Just to play save, we set the FFs to force syncing before
754	* executing GC code.
755	*
756	* @returns VBox status code.
757	* @param pVM VM Handle.
758	* @param pSSM SSM operation handle.
759	*/
760	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
761	{
762	PVMCPU pVCpu = VMMGetCpu(pVM);
763
764	LogFlow(("selmR3LoadDone:\n"));
765
766	/*
767	* Don't do anything if it's a load failure.
768	*/
769	int rc = SSMR3HandleGetStatus(pSSM);
770	if (RT_FAILURE(rc))
771	return VINF_SUCCESS;
772
773	/*
774	* Do the syncing if we're in protected mode.
775	*/
776	if (PGMGetGuestMode(pVCpu) != PGMMODE_REAL)
777	{
778	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
779	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
780	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
781	SELMR3UpdateFromCPUM(pVM, pVCpu);
782	}
783
784	/*
785	* Flag everything for resync on next raw mode entry.
786	*/
787	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
788	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
789	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
790
791	return VINF_SUCCESS;
792	}
793
794
795	/**
796	* Updates the Guest GDT & LDT virtualization based on current CPU state.
797	*
798	* @returns VBox status code.
799	* @param pVM The VM to operate on.
800	* @param pVCpu The VMCPU to operate on.
801	*/
802	VMMR3DECL(int) SELMR3UpdateFromCPUM(PVM pVM, PVMCPU pVCpu)
803	{
804	int rc = VINF_SUCCESS;
805
806	if (pVM->selm.s.fDisableMonitoring)
807	{
808	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
809	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
810	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
811
812	return VINF_SUCCESS;
813	}
814
815	STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
816
817	/*
818	* GDT sync
819	*/
820	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
821	{
822	/*
823	* Always assume the best
824	*/
825	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
826
827	/* If the GDT was changed, then make sure the LDT is checked too */
828	/** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
829	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
830	/* Same goes for the TSS selector */
831	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
832
833	/*
834	* Get the GDTR and check if there is anything to do (there usually is).
835	*/
836	VBOXGDTR GDTR;
837	CPUMGetGuestGDTR(pVCpu, &GDTR);
838	if (GDTR.cbGdt < sizeof(X86DESC))
839	{
840	Log(("No GDT entries...\n"));
841	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
842	return VINF_SUCCESS;
843	}
844
845	/*
846	* Read the Guest GDT.
847	* ASSUMES that the entire GDT is in memory.
848	*/
849	RTUINT cbEffLimit = GDTR.cbGdt;
850	PX86DESC pGDTE = &pVM->selm.s.paGdtR3[1];
851	rc = PGMPhysSimpleReadGCPtr(pVCpu, pGDTE, GDTR.pGdt + sizeof(X86DESC), cbEffLimit + 1 - sizeof(X86DESC));
852	if (RT_FAILURE(rc))
853	{
854	/*
855	* Read it page by page.
856	*
857	* Keep track of the last valid page and delay memsets and
858	* adjust cbEffLimit to reflect the effective size. The latter
859	* is something we do in the belief that the guest will probably
860	* never actually commit the last page, thus allowing us to keep
861	* our selectors in the high end of the GDT.
862	*/
863	RTUINT cbLeft = cbEffLimit + 1 - sizeof(X86DESC);
864	RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(X86DESC);
865	uint8_t pu8Dst = (uint8_t )&pVM->selm.s.paGdtR3[1];
866	uint8_t *pu8DstInvalid = pu8Dst;
867
868	while (cbLeft)
869	{
870	RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
871	cb = RT_MIN(cb, cbLeft);
872	rc = PGMPhysSimpleReadGCPtr(pVCpu, pu8Dst, GCPtrSrc, cb);
873	if (RT_SUCCESS(rc))
874	{
875	if (pu8DstInvalid != pu8Dst)
876	memset(pu8DstInvalid, 0, pu8Dst - pu8DstInvalid);
877	GCPtrSrc += cb;
878	pu8Dst += cb;
879	pu8DstInvalid = pu8Dst;
880	}
881	else if ( rc == VERR_PAGE_NOT_PRESENT
882	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
883	{
884	GCPtrSrc += cb;
885	pu8Dst += cb;
886	}
887	else
888	{
889	AssertReleaseMsgFailed(("Couldn't read GDT at %016RX64, rc=%Rrc!\n", GDTR.pGdt, rc));
890	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
891	return VERR_NOT_IMPLEMENTED;
892	}
893	cbLeft -= cb;
894	}
895
896	/* any invalid pages at the end? */
897	if (pu8DstInvalid != pu8Dst)
898	{
899	cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtR3 - 1;
900	/* If any GDTEs was invalidated, zero them. */
901	if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
902	memset(pu8DstInvalid + cbEffLimit + 1, 0, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
903	}
904
905	/* keep track of the effective limit. */
906	if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
907	{
908	Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
909	pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
910	pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
911	}
912	}
913
914	/*
915	* Check if the Guest GDT intrudes on our GDT entries.
916	*/
917	/** @todo we should try to minimize relocations by making sure our current selectors can be reused. */
918	RTSEL aHyperSel[SELM_HYPER_SEL_MAX];
919	if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
920	{
921	PX86DESC pGDTEStart = pVM->selm.s.paGdtR3;
922	PX86DESC pGDTECur = (PX86DESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(X86DESC));
923	int iGDT = 0;
924
925	Log(("Internal SELM GDT conflict: use non-present entries\n"));
926	STAM_COUNTER_INC(&pVM->selm.s.StatScanForHyperSels);
927	while (pGDTECur > pGDTEStart)
928	{
929	/* We can reuse non-present entries */
930	if (!pGDTECur->Gen.u1Present)
931	{
932	aHyperSel[iGDT] = ((uintptr_t)pGDTECur - (uintptr_t)pVM->selm.s.paGdtR3) / sizeof(X86DESC);
933	aHyperSel[iGDT] = aHyperSel[iGDT] << X86_SEL_SHIFT;
934	Log(("SELM: Found unused GDT %04X\n", aHyperSel[iGDT]));
935	iGDT++;
936	if (iGDT >= SELM_HYPER_SEL_MAX)
937	break;
938	}
939
940	pGDTECur--;
941	}
942	if (iGDT != SELM_HYPER_SEL_MAX)
943	{
944	AssertReleaseMsgFailed(("Internal SELM GDT conflict.\n"));
945	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
946	return VERR_NOT_IMPLEMENTED;
947	}
948	}
949	else
950	{
951	aHyperSel[SELM_HYPER_SEL_CS] = SELM_HYPER_DEFAULT_SEL_CS;
952	aHyperSel[SELM_HYPER_SEL_DS] = SELM_HYPER_DEFAULT_SEL_DS;
953	aHyperSel[SELM_HYPER_SEL_CS64] = SELM_HYPER_DEFAULT_SEL_CS64;
954	aHyperSel[SELM_HYPER_SEL_TSS] = SELM_HYPER_DEFAULT_SEL_TSS;
955	aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SELM_HYPER_DEFAULT_SEL_TSS_TRAP08;
956	}
957
958	/*
959	* Work thru the copied GDT entries adjusting them for correct virtualization.
960	*/
961	PX86DESC pGDTEEnd = (PX86DESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(X86DESC));
962	while (pGDTE < pGDTEEnd)
963	{
964	if (pGDTE->Gen.u1Present)
965	{
966	/*
967	* Code and data selectors are generally 1:1, with the
968	* 'little' adjustment we do for DPL 0 selectors.
969	*/
970	if (pGDTE->Gen.u1DescType)
971	{
972	/*
973	* Hack for A-bit against Trap E on read-only GDT.
974	*/
975	/** @todo Fix this by loading ds and cs before turning off WP. */
976	pGDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
977
978	/*
979	* All DPL 0 code and data segments are squeezed into DPL 1.
980	*
981	* We're skipping conforming segments here because those
982	* cannot give us any trouble.
983	*/
984	if ( pGDTE->Gen.u2Dpl == 0
985	&& (pGDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
986	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
987	pGDTE->Gen.u2Dpl = 1;
988	}
989	else
990	{
991	/*
992	* System type selectors are marked not present.
993	* Recompiler or special handling is required for these.
994	*/
995	/** @todo what about interrupt gates and rawr0? */
996	pGDTE->Gen.u1Present = 0;
997	}
998	}
999
1000	/* Next GDT entry. */
1001	pGDTE++;
1002	}
1003
1004	/*
1005	* Check if our hypervisor selectors were changed.
1006	*/
1007	if ( aHyperSel[SELM_HYPER_SEL_CS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]
1008	\|\| aHyperSel[SELM_HYPER_SEL_DS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]
1009	\|\| aHyperSel[SELM_HYPER_SEL_CS64] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64]
1010	\|\| aHyperSel[SELM_HYPER_SEL_TSS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]
1011	\|\| aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08])
1012	{
1013	/* Reinitialize our hypervisor GDTs */
1014	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = aHyperSel[SELM_HYPER_SEL_CS];
1015	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = aHyperSel[SELM_HYPER_SEL_DS];
1016	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = aHyperSel[SELM_HYPER_SEL_CS64];
1017	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = aHyperSel[SELM_HYPER_SEL_TSS];
1018	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
1019
1020	STAM_COUNTER_INC(&pVM->selm.s.StatHyperSelsChanged);
1021
1022	/*
1023	* Do the relocation callbacks to let everyone update their hyper selector dependencies.
1024	* (SELMR3Relocate will call selmR3SetupHyperGDTSelectors() for us.)
1025	*/
1026	VMR3Relocate(pVM, 0);
1027	}
1028	else if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
1029	/* We overwrote all entries above, so we have to save them again. */
1030	selmR3SetupHyperGDTSelectors(pVM);
1031
1032	/*
1033	* Adjust the cached GDT limit.
1034	* Any GDT entries which have been removed must be cleared.
1035	*/
1036	if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
1037	{
1038	if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
1039	memset(pGDTE, 0, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
1040	#ifndef SELM_TRACK_GUEST_GDT_CHANGES
1041	pVM->selm.s.GuestGdtr.cbGdt = GDTR.cbGdt;
1042	#endif
1043	}
1044
1045	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
1046	/*
1047	* Check if Guest's GDTR is changed.
1048	*/
1049	if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
1050	\|\| GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1051	{
1052	Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%016RX64 cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
1053
1054	/*
1055	* [Re]Register write virtual handler for guest's GDT.
1056	*/
1057	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
1058	{
1059	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
1060	AssertRC(rc);
1061	}
1062
1063	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1064	0, selmR3GuestGDTWriteHandler, "selmRCGuestGDTWriteHandler", 0, "Guest GDT write access handler");
1065	if (RT_FAILURE(rc))
1066	return rc;
1067
1068	/* Update saved Guest GDTR. */
1069	pVM->selm.s.GuestGdtr = GDTR;
1070	pVM->selm.s.fGDTRangeRegistered = true;
1071	}
1072	#endif
1073	}
1074
1075	/*
1076	* TSS sync
1077	*/
1078	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1079	{
1080	SELMR3SyncTSS(pVM, pVCpu);
1081	}
1082
1083	/*
1084	* LDT sync
1085	*/
1086	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_LDT))
1087	{
1088	/*
1089	* Always assume the best
1090	*/
1091	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
1092
1093	/*
1094	* LDT handling is done similarly to the GDT handling with a shadow
1095	* array. However, since the LDT is expected to be swappable (at least
1096	* some ancient OSes makes it swappable) it must be floating and
1097	* synced on a per-page basis.
1098	*
1099	* Eventually we will change this to be fully on demand. Meaning that
1100	* we will only sync pages containing LDT selectors actually used and
1101	* let the #PF handler lazily sync pages as they are used.
1102	* (This applies to GDT too, when we start making OS/2 fast.)
1103	*/
1104
1105	/*
1106	* First, determin the current LDT selector.
1107	*/
1108	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1109	if ((SelLdt & X86_SEL_MASK) == 0)
1110	{
1111	/* ldtr = 0 - update hyper LDTR and deregister any active handler. */
1112	CPUMSetHyperLDTR(pVCpu, 0);
1113	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1114	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1115	{
1116	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1117	AssertRC(rc);
1118	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1119	}
1120	#endif
1121	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1122	return VINF_SUCCESS;
1123	}
1124
1125	/*
1126	* Get the LDT selector.
1127	*/
1128	PX86DESC pDesc = &pVM->selm.s.paGdtR3[SelLdt >> X86_SEL_SHIFT];
1129	RTGCPTR GCPtrLdt = X86DESC_BASE(*pDesc);
1130	unsigned cbLdt = X86DESC_LIMIT(*pDesc);
1131	if (pDesc->Gen.u1Granularity)
1132	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1133
1134	/*
1135	* Validate it.
1136	*/
1137	if ( !cbLdt
1138	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
1139	\|\| pDesc->Gen.u1DescType
1140	\|\| pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1141	{
1142	AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
1143
1144	/* cbLdt > 0:
1145	* This is quite impossible, so we do as most people do when faced with
1146	* the impossible, we simply ignore it.
1147	*/
1148	CPUMSetHyperLDTR(pVCpu, 0);
1149	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1150	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1151	{
1152	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1153	AssertRC(rc);
1154	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1155	}
1156	#endif
1157	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1158	return VINF_SUCCESS;
1159	}
1160	/** @todo check what intel does about odd limits. */
1161	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1162
1163	/*
1164	* Use the cached guest ldt address if the descriptor has already been modified (see below)
1165	* (this is necessary due to redundant LDT updates; see todo above at GDT sync)
1166	*/
1167	if (MMHyperIsInsideArea(pVM, GCPtrLdt))
1168	GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
1169
1170
1171	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1172	/** @todo Handle only present LDT segments. */
1173	// if (pDesc->Gen.u1Present)
1174	{
1175	/*
1176	* Check if Guest's LDT address/limit is changed.
1177	*/
1178	if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
1179	\|\| cbLdt != pVM->selm.s.cbLdtLimit)
1180	{
1181	Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %RGv:%04x to %RGv:%04x. (GDTR=%016RX64:%04x)\n",
1182	pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1183
1184	/*
1185	* [Re]Register write virtual handler for guest's GDT.
1186	* In the event of LDT overlapping something, don't install it just assume it's being updated.
1187	*/
1188	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1189	{
1190	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1191	AssertRC(rc);
1192	}
1193	#ifdef DEBUG
1194	if (pDesc->Gen.u1Present)
1195	Log(("LDT selector marked not present!!\n"));
1196	#endif
1197	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
1198	0, selmR3GuestLDTWriteHandler, "selmRCGuestLDTWriteHandler", 0, "Guest LDT write access handler");
1199	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1200	{
1201	/** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
1202	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1203	Log(("WARNING: Guest LDT (%RGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%016RX64:%04x)\n",
1204	GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1205	}
1206	else if (RT_SUCCESS(rc))
1207	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1208	else
1209	{
1210	CPUMSetHyperLDTR(pVCpu, 0);
1211	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1212	return rc;
1213	}
1214
1215	pVM->selm.s.cbLdtLimit = cbLdt;
1216	}
1217	}
1218	#else
1219	pVM->selm.s.cbLdtLimit = cbLdt;
1220	#endif
1221
1222	/*
1223	* Calc Shadow LDT base.
1224	*/
1225	unsigned off;
1226	pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
1227	RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.pvLdtRC + off);
1228	PX86DESC pShadowLDT = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1229
1230	/*
1231	* Enable the LDT selector in the shadow GDT.
1232	*/
1233	pDesc->Gen.u1Present = 1;
1234	pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
1235	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
1236	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
1237	pDesc->Gen.u1Available = 0;
1238	pDesc->Gen.u1Long = 0;
1239	if (cbLdt > 0xffff)
1240	{
1241	cbLdt = 0xffff;
1242	pDesc->Gen.u4LimitHigh = 0;
1243	pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
1244	}
1245
1246	/*
1247	* Set Hyper LDTR and notify TRPM.
1248	*/
1249	CPUMSetHyperLDTR(pVCpu, SelLdt);
1250
1251	/*
1252	* Loop synchronising the LDT page by page.
1253	*/
1254	/** @todo investigate how intel handle various operations on half present cross page entries. */
1255	off = GCPtrLdt & (sizeof(X86DESC) - 1);
1256	AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
1257
1258	/* Note: Do not skip the first selector; unlike the GDT, a zero LDT selector is perfectly valid. */
1259	unsigned cbLeft = cbLdt + 1;
1260	PX86DESC pLDTE = pShadowLDT;
1261	while (cbLeft)
1262	{
1263	/*
1264	* Read a chunk.
1265	*/
1266	unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
1267	if (cbChunk > cbLeft)
1268	cbChunk = cbLeft;
1269	rc = PGMPhysSimpleReadGCPtr(pVCpu, pShadowLDT, GCPtrLdt, cbChunk);
1270	if (RT_SUCCESS(rc))
1271	{
1272	/*
1273	* Mark page
1274	*/
1275	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
1276	AssertRC(rc);
1277
1278	/*
1279	* Loop thru the available LDT entries.
1280	* Figure out where to start and end and the potential cross pageness of
1281	* things adds a little complexity. pLDTE is updated there and not in the
1282	* 'next' part of the loop. The pLDTEEnd is inclusive.
1283	*/
1284	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
1285	if (pLDTE + 1 < pShadowLDT)
1286	pLDTE = (PX86DESC)((uintptr_t)pShadowLDT + off);
1287	while (pLDTE <= pLDTEEnd)
1288	{
1289	if (pLDTE->Gen.u1Present)
1290	{
1291	/*
1292	* Code and data selectors are generally 1:1, with the
1293	* 'little' adjustment we do for DPL 0 selectors.
1294	*/
1295	if (pLDTE->Gen.u1DescType)
1296	{
1297	/*
1298	* Hack for A-bit against Trap E on read-only GDT.
1299	*/
1300	/** @todo Fix this by loading ds and cs before turning off WP. */
1301	if (!(pLDTE->Gen.u4Type & X86_SEL_TYPE_ACCESSED))
1302	pLDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
1303
1304	/*
1305	* All DPL 0 code and data segments are squeezed into DPL 1.
1306	*
1307	* We're skipping conforming segments here because those
1308	* cannot give us any trouble.
1309	*/
1310	if ( pLDTE->Gen.u2Dpl == 0
1311	&& (pLDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
1312	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
1313	pLDTE->Gen.u2Dpl = 1;
1314	}
1315	else
1316	{
1317	/*
1318	* System type selectors are marked not present.
1319	* Recompiler or special handling is required for these.
1320	*/
1321	/** @todo what about interrupt gates and rawr0? */
1322	pLDTE->Gen.u1Present = 0;
1323	}
1324	}
1325
1326	/* Next LDT entry. */
1327	pLDTE++;
1328	}
1329	}
1330	else
1331	{
1332	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%Rrc\n", rc));
1333	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
1334	AssertRC(rc);
1335	}
1336
1337	/*
1338	* Advance to the next page.
1339	*/
1340	cbLeft -= cbChunk;
1341	GCPtrShadowLDT += cbChunk;
1342	pShadowLDT = (PX86DESC)((char *)pShadowLDT + cbChunk);
1343	GCPtrLdt += cbChunk;
1344	}
1345	}
1346
1347	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1348	return VINF_SUCCESS;
1349	}
1350
1351
1352	/**
1353	* \#PF Handler callback for virtual access handler ranges.
1354	*
1355	* Important to realize that a physical page in a range can have aliases, and
1356	* for ALL and WRITE handlers these will also trigger.
1357	*
1358	* @returns VINF_SUCCESS if the handler have carried out the operation.
1359	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1360	* @param pVM VM Handle.
1361	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1362	* @param pvPtr The HC mapping of that address.
1363	* @param pvBuf What the guest is reading/writing.
1364	* @param cbBuf How much it's reading/writing.
1365	* @param enmAccessType The access type.
1366	* @param pvUser User argument.
1367	*/
1368	static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1369	{
1370	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1371	Log(("selmR3GuestGDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf));
1372
1373	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_GDT);
1374	return VINF_PGM_HANDLER_DO_DEFAULT;
1375	}
1376
1377
1378	/**
1379	* \#PF Handler callback for virtual access handler ranges.
1380	*
1381	* Important to realize that a physical page in a range can have aliases, and
1382	* for ALL and WRITE handlers these will also trigger.
1383	*
1384	* @returns VINF_SUCCESS if the handler have carried out the operation.
1385	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1386	* @param pVM VM Handle.
1387	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1388	* @param pvPtr The HC mapping of that address.
1389	* @param pvBuf What the guest is reading/writing.
1390	* @param cbBuf How much it's reading/writing.
1391	* @param enmAccessType The access type.
1392	* @param pvUser User argument.
1393	*/
1394	static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1395	{
1396	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1397	Log(("selmR3GuestLDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf));
1398	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_LDT);
1399	return VINF_PGM_HANDLER_DO_DEFAULT;
1400	}
1401
1402
1403	/**
1404	* \#PF Handler callback for virtual access handler ranges.
1405	*
1406	* Important to realize that a physical page in a range can have aliases, and
1407	* for ALL and WRITE handlers these will also trigger.
1408	*
1409	* @returns VINF_SUCCESS if the handler have carried out the operation.
1410	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1411	* @param pVM VM Handle.
1412	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1413	* @param pvPtr The HC mapping of that address.
1414	* @param pvBuf What the guest is reading/writing.
1415	* @param cbBuf How much it's reading/writing.
1416	* @param enmAccessType The access type.
1417	* @param pvUser User argument.
1418	*/
1419	static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1420	{
1421	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1422	Log(("selmR3GuestTSSWriteHandler: write %.*Rhxs to %RGv size %d\n", RT_MIN(8, cbBuf), pvBuf, GCPtr, cbBuf));
1423
1424	/** @todo This can be optimized by checking for the ESP0 offset and tracking TR
1425	* reloads in REM (setting VM_FF_SELM_SYNC_TSS if TR is reloaded). We
1426	* should probably also deregister the virtual handler if TR.base/size
1427	* changes while we're in REM. */
1428
1429	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_TSS);
1430
1431	return VINF_PGM_HANDLER_DO_DEFAULT;
1432	}
1433
1434
1435	/**
1436	* Synchronize the shadowed fields in the TSS.
1437	*
1438	* At present we're shadowing the ring-0 stack selector & pointer, and the
1439	* interrupt redirection bitmap (if present). We take the lazy approach wrt to
1440	* REM and this function is called both if REM made any changes to the TSS or
1441	* loaded TR.
1442	*
1443	* @returns VBox status code.
1444	* @param pVM The VM to operate on.
1445	* @param pVCpu The VMCPU to operate on.
1446	*/
1447	VMMR3DECL(int) SELMR3SyncTSS(PVM pVM, PVMCPU pVCpu)
1448	{
1449	int rc;
1450
1451	if (pVM->selm.s.fDisableMonitoring)
1452	{
1453	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1454	return VINF_SUCCESS;
1455	}
1456
1457	STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
1458	Assert(VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS));
1459
1460	/*
1461	* Get TR and extract and store the basic info.
1462	*
1463	* Note! The TSS limit is not checked by the LTR code, so we
1464	* have to be a bit careful with it. We make sure cbTss
1465	* won't be zero if TR is valid and if it's NULL we'll
1466	* make sure cbTss is 0.
1467	*/
1468	CPUMSELREGHID trHid;
1469	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1470	RTGCPTR GCPtrTss = trHid.u64Base;
1471	uint32_t cbTss = trHid.u32Limit;
1472	Assert( (SelTss & X86_SEL_MASK)
1473	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1474	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1475	if (SelTss & X86_SEL_MASK)
1476	{
1477	Assert(!(SelTss & X86_SEL_LDT));
1478	Assert(trHid.Attr.n.u1DescType == 0);
1479	Assert( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1480	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY);
1481	if (!++cbTss)
1482	cbTss = UINT32_MAX;
1483	}
1484	else
1485	{
1486	Assert( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1487	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1488	cbTss = 0; /* the reset case. */
1489	}
1490	pVM->selm.s.cbGuestTss = cbTss;
1491	pVM->selm.s.fGuestTss32Bit = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1492	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1493
1494	/*
1495	* Figure out the size of what need to monitor.
1496	*/
1497	/* We're not interested in any 16-bit TSSes. */
1498	uint32_t cbMonitoredTss = cbTss;
1499	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1500	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1501	cbMonitoredTss = 0;
1502
1503	pVM->selm.s.offGuestIoBitmap = 0;
1504	bool fNoRing1Stack = true;
1505	if (cbMonitoredTss)
1506	{
1507	/*
1508	* 32-bit TSS. What we're really keen on is the SS0 and ESP0 fields.
1509	* If VME is enabled we also want to keep an eye on the interrupt
1510	* redirection bitmap.
1511	*/
1512	VBOXTSS Tss;
1513	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1514	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1515	if ( !(cr4 & X86_CR4_VME)
1516	\|\| ( RT_SUCCESS(rc)
1517	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1518	&& Tss.offIoBitmap > cbTss) /* beyond the end / /* @todo not sure how the partial case is handled; probably not allowed. */
1519	)
1520	/* No interrupt redirection bitmap, just ESP0 and SS0. */
1521	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1522	else if (RT_SUCCESS(rc))
1523	{
1524	/*
1525	* Everything up to and including the interrupt redirection bitmap. Unfortunately
1526	* this can be quite a large chunk. We use to skip it earlier and just hope it
1527	* was kind of static...
1528	*
1529	* Update the virtual interrupt redirection bitmap while we're here.
1530	* (It is located in the 32 bytes before TR:offIoBitmap.)
1531	*/
1532	cbMonitoredTss = Tss.offIoBitmap;
1533	pVM->selm.s.offGuestIoBitmap = Tss.offIoBitmap;
1534
1535	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1536	rc = PGMPhysSimpleReadGCPtr(pVCpu, &pVM->selm.s.Tss.IntRedirBitmap,
1537	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1538	AssertRC(rc);
1539	/** @todo memset the bitmap on failure? */
1540	Log2(("Redirection bitmap:\n"));
1541	Log2(("%.*Rhxd\n", sizeof(Tss.IntRedirBitmap), &pVM->selm.s.Tss.IntRedirBitmap));
1542	}
1543	else
1544	{
1545	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1546	pVM->selm.s.offGuestIoBitmap = 0;
1547	/** @todo memset the bitmap? */
1548	}
1549
1550	/*
1551	* Update the ring 0 stack selector and base address.
1552	*/
1553	if (RT_SUCCESS(rc))
1554	{
1555	#ifdef LOG_ENABLED
1556	if (LogIsEnabled())
1557	{
1558	uint32_t ssr0, espr0;
1559	SELMGetRing1Stack(pVM, &ssr0, &espr0);
1560	if ((ssr0 & ~1) != Tss.ss0 \|\| espr0 != Tss.esp0)
1561	{
1562	RTGCPHYS GCPhys = NIL_RTGCPHYS;
1563	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1564	Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1565	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1566	AssertMsg(ssr0 != Tss.ss0,
1567	("ring-1 leak into TSS.SS0! %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1568	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1569	}
1570	Log(("offIoBitmap=%#x\n", Tss.offIoBitmap));
1571	}
1572	#endif /* LOG_ENABLED */
1573	AssertMsg(!(Tss.ss0 & 3), ("ring-1 leak into TSS.SS0? %04X:%08X\n", Tss.ss0, Tss.esp0));
1574
1575	/* Update our TSS structure for the guest's ring 1 stack */
1576	selmSetRing1Stack(pVM, Tss.ss0 \| 1, Tss.esp0);
1577	pVM->selm.s.fSyncTSSRing0Stack = fNoRing1Stack = false;
1578	}
1579	}
1580
1581	/*
1582	* Flush the ring-1 stack and the direct syscall dispatching if we
1583	* cannot obtain SS0:ESP0.
1584	*/
1585	if (fNoRing1Stack)
1586	{
1587	selmSetRing1Stack(pVM, 0 /* invalid SS */, 0);
1588	pVM->selm.s.fSyncTSSRing0Stack = cbMonitoredTss != 0;
1589
1590	/** @todo handle these dependencies better! */
1591	TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
1592	TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
1593	}
1594
1595	/*
1596	* Check for monitor changes and apply them.
1597	*/
1598	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1599	\|\| cbMonitoredTss != pVM->selm.s.cbMonitoredGuestTss)
1600	{
1601	Log(("SELMR3SyncTSS: Guest's TSS is changed to pTss=%RGv cbMonitoredTss=%08X cbGuestTss=%#08x\n",
1602	GCPtrTss, cbMonitoredTss, pVM->selm.s.cbGuestTss));
1603
1604	/* Release the old range first. */
1605	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
1606	{
1607	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
1608	AssertRC(rc);
1609	}
1610
1611	/* Register the write handler if TS != 0. */
1612	if (cbMonitoredTss != 0)
1613	{
1614	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1615	0, selmR3GuestTSSWriteHandler,
1616	"selmRCGuestTSSWriteHandler", 0, "Guest TSS write access handler");
1617	if (RT_FAILURE(rc))
1618	{
1619	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1620	return rc;
1621	}
1622
1623	/* Update saved Guest TSS info. */
1624	pVM->selm.s.GCPtrGuestTss = GCPtrTss;
1625	pVM->selm.s.cbMonitoredGuestTss = cbMonitoredTss;
1626	pVM->selm.s.GCSelTss = SelTss;
1627	}
1628	else
1629	{
1630	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
1631	pVM->selm.s.cbMonitoredGuestTss = 0;
1632	pVM->selm.s.GCSelTss = 0;
1633	}
1634	}
1635
1636	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1637
1638	STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
1639	return VINF_SUCCESS;
1640	}
1641
1642
1643	/**
1644	* Compares the Guest GDT and LDT with the shadow tables.
1645	* This is a VBOX_STRICT only function.
1646	*
1647	* @returns VBox status code.
1648	* @param pVM The VM Handle.
1649	*/
1650	VMMR3DECL(int) SELMR3DebugCheck(PVM pVM)
1651	{
1652	#ifdef VBOX_STRICT
1653	PVMCPU pVCpu = VMMGetCpu(pVM);
1654
1655	/*
1656	* Get GDTR and check for conflict.
1657	*/
1658	VBOXGDTR GDTR;
1659	CPUMGetGuestGDTR(pVCpu, &GDTR);
1660	if (GDTR.cbGdt == 0)
1661	return VINF_SUCCESS;
1662
1663	if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
1664	Log(("SELMR3DebugCheck: guest GDT size forced us to look for unused selectors.\n"));
1665
1666	if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1667	Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
1668
1669	/*
1670	* Loop thru the GDT checking each entry.
1671	*/
1672	RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
1673	PX86DESC pGDTE = pVM->selm.s.paGdtR3;
1674	PX86DESC pGDTEEnd = (PX86DESC)((uintptr_t)pGDTE + GDTR.cbGdt);
1675	while (pGDTE < pGDTEEnd)
1676	{
1677	X86DESC GDTEGuest;
1678	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
1679	if (RT_SUCCESS(rc))
1680	{
1681	if (pGDTE->Gen.u1DescType \|\| pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1682	{
1683	if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
1684	\|\| pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
1685	\|\| pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
1686	\|\| pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
1687	\|\| pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
1688	\|\| pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
1689	\|\| pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
1690	{
1691	unsigned iGDT = pGDTE - pVM->selm.s.paGdtR3;
1692	SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
1693	SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
1694	}
1695	}
1696	}
1697
1698	/* Advance to the next descriptor. */
1699	GCPtrGDTEGuest += sizeof(X86DESC);
1700	pGDTE++;
1701	}
1702
1703
1704	/*
1705	* LDT?
1706	*/
1707	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1708	if ((SelLdt & X86_SEL_MASK) == 0)
1709	return VINF_SUCCESS;
1710	if (SelLdt > GDTR.cbGdt)
1711	{
1712	Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
1713	return VERR_INTERNAL_ERROR;
1714	}
1715	X86DESC LDTDesc;
1716	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
1717	if (RT_FAILURE(rc))
1718	{
1719	Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
1720	return rc;
1721	}
1722	RTGCPTR GCPtrLDTEGuest = X86DESC_BASE(LDTDesc);
1723	unsigned cbLdt = X86DESC_LIMIT(LDTDesc);
1724	if (LDTDesc.Gen.u1Granularity)
1725	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1726
1727	/*
1728	* Validate it.
1729	*/
1730	if (!cbLdt)
1731	return VINF_SUCCESS;
1732	/** @todo check what intel does about odd limits. */
1733	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1734	if ( LDTDesc.Gen.u1DescType
1735	\|\| LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
1736	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
1737	{
1738	Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
1739	return VERR_INTERNAL_ERROR;
1740	}
1741
1742	/*
1743	* Loop thru the LDT checking each entry.
1744	*/
1745	unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
1746	PX86DESC pLDTE = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1747	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pGDTE + cbLdt);
1748	while (pLDTE < pLDTEEnd)
1749	{
1750	X86DESC LDTEGuest;
1751	rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
1752	if (RT_SUCCESS(rc))
1753	{
1754	if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
1755	\|\| pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
1756	\|\| pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
1757	\|\| pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
1758	\|\| pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
1759	\|\| pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
1760	\|\| pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
1761	{
1762	unsigned iLDT = pLDTE - (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1763	SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
1764	SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
1765	}
1766	}
1767
1768	/* Advance to the next descriptor. */
1769	GCPtrLDTEGuest += sizeof(X86DESC);
1770	pLDTE++;
1771	}
1772
1773	#else /* !VBOX_STRICT */
1774	NOREF(pVM);
1775	#endif /* !VBOX_STRICT */
1776
1777	return VINF_SUCCESS;
1778	}
1779
1780
1781	/**
1782	* Validates the RawR0 TSS values against the one in the Guest TSS.
1783	*
1784	* @returns true if it matches.
1785	* @returns false and assertions on mismatch..
1786	* @param pVM VM Handle.
1787	*/
1788	VMMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
1789	{
1790	#ifdef VBOX_STRICT
1791	PVMCPU pVCpu = VMMGetCpu(pVM);
1792
1793	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1794	return true;
1795
1796	/*
1797	* Get TR and extract the basic info.
1798	*/
1799	CPUMSELREGHID trHid;
1800	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1801	RTGCPTR GCPtrTss = trHid.u64Base;
1802	uint32_t cbTss = trHid.u32Limit;
1803	Assert( (SelTss & X86_SEL_MASK)
1804	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1805	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1806	if (SelTss & X86_SEL_MASK)
1807	{
1808	AssertReturn(!(SelTss & X86_SEL_LDT), false);
1809	AssertReturn(trHid.Attr.n.u1DescType == 0, false);
1810	AssertReturn( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1811	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY,
1812	false);
1813	if (!++cbTss)
1814	cbTss = UINT32_MAX;
1815	}
1816	else
1817	{
1818	AssertReturn( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1819	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */),
1820	false);
1821	cbTss = 0; /* the reset case. */
1822	}
1823	AssertMsgReturn(pVM->selm.s.cbGuestTss == cbTss, ("%#x %#x\n", pVM->selm.s.cbGuestTss, cbTss), false);
1824	AssertMsgReturn(pVM->selm.s.fGuestTss32Bit == ( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1825	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY),
1826	("%RTbool u4Type=%d\n", pVM->selm.s.fGuestTss32Bit, trHid.Attr.n.u4Type),
1827	false);
1828	AssertMsgReturn( pVM->selm.s.GCSelTss == SelTss
1829	\|\| (!pVM->selm.s.GCSelTss && !(SelTss & X86_SEL_LDT)),
1830	("%#x %#x\n", pVM->selm.s.GCSelTss, SelTss),
1831	false);
1832	AssertMsgReturn( pVM->selm.s.GCPtrGuestTss == GCPtrTss
1833	\|\| (pVM->selm.s.GCPtrGuestTss == RTRCPTR_MAX && !GCPtrTss),
1834	("%#RGv %#RGv\n", pVM->selm.s.GCPtrGuestTss, GCPtrTss),
1835	false);
1836
1837
1838	/*
1839	* Figure out the size of what need to monitor.
1840	*/
1841	bool fNoRing1Stack = true;
1842	/* We're not interested in any 16-bit TSSes. */
1843	uint32_t cbMonitoredTss = cbTss;
1844	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1845	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1846	cbMonitoredTss = 0;
1847	if (cbMonitoredTss)
1848	{
1849	VBOXTSS Tss;
1850	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1851	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1852	AssertReturn( rc == VINF_SUCCESS
1853	/* Happends early in XP boot during page table switching. */
1854	\|\| ( (rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT)
1855	&& !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF)),
1856	false);
1857	if ( !(cr4 & X86_CR4_VME)
1858	\|\| ( RT_SUCCESS(rc)
1859	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1860	&& Tss.offIoBitmap > cbTss)
1861	)
1862	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1863	else if (RT_SUCCESS(rc))
1864	{
1865	cbMonitoredTss = Tss.offIoBitmap;
1866	AssertMsgReturn(pVM->selm.s.offGuestIoBitmap == Tss.offIoBitmap,
1867	("#x %#x\n", pVM->selm.s.offGuestIoBitmap, Tss.offIoBitmap),
1868	false);
1869
1870	/* check the bitmap */
1871	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1872	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss.IntRedirBitmap,
1873	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1874	AssertRCReturn(rc, false);
1875	AssertMsgReturn(!memcmp(&Tss.IntRedirBitmap[0], &pVM->selm.s.Tss.IntRedirBitmap[0], sizeof(Tss.IntRedirBitmap)),
1876	("offIoBitmap=%#x cbTss=%#x\n"
1877	" Guest: %.32Rhxs\n"
1878	"Shadow: %.32Rhxs\n",
1879	Tss.offIoBitmap, cbTss,
1880	&Tss.IntRedirBitmap[0],
1881	&pVM->selm.s.Tss.IntRedirBitmap[0]),
1882	false);
1883	}
1884	else
1885	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1886
1887	/*
1888	* Check SS0 and ESP0.
1889	*/
1890	if ( !pVM->selm.s.fSyncTSSRing0Stack
1891	&& RT_SUCCESS(rc))
1892	{
1893	if ( Tss.esp0 != pVM->selm.s.Tss.esp1
1894	\|\| Tss.ss0 != (pVM->selm.s.Tss.ss1 & ~1))
1895	{
1896	RTGCPHYS GCPhys;
1897	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1898	AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%RGv Phys=%RGp\n",
1899	(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1,
1900	Tss.ss1, Tss.esp1, GCPtrTss, GCPhys));
1901	return false;
1902	}
1903	}
1904	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1905	}
1906	else
1907	{
1908	AssertMsgReturn(pVM->selm.s.Tss.ss1 == 0 && pVM->selm.s.Tss.esp1 == 0, ("%04x:%08x\n", pVM->selm.s.Tss.ss1, pVM->selm.s.Tss.esp1), false);
1909	AssertReturn(!pVM->selm.s.fSyncTSSRing0Stack, false);
1910	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1911	}
1912
1913
1914
1915	return true;
1916
1917	#else /* !VBOX_STRICT */
1918	NOREF(pVM);
1919	return true;
1920	#endif /* !VBOX_STRICT */
1921	}
1922
1923
1924	/**
1925	* Returns flat address and limit of LDT by LDT selector from guest GDTR.
1926	*
1927	* Fully validate selector.
1928	*
1929	* @returns VBox status.
1930	* @param pVM VM Handle.
1931	* @param SelLdt LDT selector.
1932	* @param ppvLdt Where to store the flat address of LDT.
1933	* @param pcbLimit Where to store LDT limit.
1934	*/
1935	VMMDECL(int) SELMGetLDTFromSel(PVM pVM, RTSEL SelLdt, PRTGCPTR ppvLdt, unsigned *pcbLimit)
1936	{
1937	PVMCPU pVCpu = VMMGetCpu(pVM);
1938
1939	/* Get guest GDTR. */
1940	VBOXGDTR GDTR;
1941	CPUMGetGuestGDTR(pVCpu, &GDTR);
1942
1943	/* Check selector TI and GDT limit. */
1944	if ( (SelLdt & X86_SEL_LDT)
1945	\|\| SelLdt > GDTR.cbGdt)
1946	return VERR_INVALID_SELECTOR;
1947
1948	/* Read descriptor from GC. */
1949	X86DESC Desc;
1950	int rc = PGMPhysSimpleReadGCPtr(pVCpu, (void *)&Desc, (RTGCPTR)(GDTR.pGdt + (SelLdt & X86_SEL_MASK)), sizeof(Desc));
1951	if (RT_FAILURE(rc))
1952	{
1953	/* fatal */
1954	AssertMsgFailed(("Can't read LDT descriptor for selector=%04X\n", SelLdt));
1955	return VERR_SELECTOR_NOT_PRESENT;
1956	}
1957
1958	/* Check if LDT descriptor is not present. */
1959	if (Desc.Gen.u1Present == 0)
1960	return VERR_SELECTOR_NOT_PRESENT;
1961
1962	/* Check LDT descriptor type. */
1963	if ( Desc.Gen.u1DescType == 1
1964	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1965	return VERR_INVALID_SELECTOR;
1966
1967	/* LDT descriptor is ok. */
1968	if (ppvLdt)
1969	{
1970	*ppvLdt = (RTGCPTR)X86DESC_BASE(Desc);
1971	*pcbLimit = X86DESC_LIMIT(Desc);
1972	}
1973	return VINF_SUCCESS;
1974	}
1975
1976
1977	/**
1978	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
1979	*
1980	* See SELMR3GetSelectorInfo for details.
1981	*
1982	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
1983	*
1984	* @param pVM VM handle.
1985	* @param pVCpu VMCPU handle.
1986	* @param Sel The selector to get info about.
1987	* @param pSelInfo Where to store the information.
1988	*/
1989	static int selmR3GetSelectorInfo64(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
1990	{
1991	/*
1992	* Read it from the guest descriptor table.
1993	*/
1994	X86DESC64 Desc;
1995	VBOXGDTR Gdtr;
1996	RTGCPTR GCPtrDesc;
1997	CPUMGetGuestGDTR(pVCpu, &Gdtr);
1998	if (!(Sel & X86_SEL_LDT))
1999	{
2000	/* GDT */
2001	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2002	return VERR_INVALID_SELECTOR;
2003	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2004	}
2005	else
2006	{
2007	/*
2008	* LDT - must locate the LDT first.
2009	*/
2010	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2011	if ( (unsigned)(SelLdt & X86_SEL_MASK) < sizeof(X86DESC) /* the first selector is invalid, right? / /* @todo r=bird: No, I don't think so */
2012	\|\| (unsigned)(SelLdt & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2013	return VERR_INVALID_SELECTOR;
2014	GCPtrDesc = Gdtr.pGdt + (SelLdt & X86_SEL_MASK);
2015	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2016	if (RT_FAILURE(rc))
2017	return rc;
2018
2019	/* validate the LDT descriptor. */
2020	if (Desc.Gen.u1Present == 0)
2021	return VERR_SELECTOR_NOT_PRESENT;
2022	if ( Desc.Gen.u1DescType == 1
2023	\|\| Desc.Gen.u4Type != AMD64_SEL_TYPE_SYS_LDT)
2024	return VERR_INVALID_SELECTOR;
2025
2026	uint32_t cbLimit = X86DESC_LIMIT(Desc);
2027	if (Desc.Gen.u1Granularity)
2028	cbLimit = (cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2029	if ((uint32_t)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > cbLimit)
2030	return VERR_INVALID_SELECTOR;
2031
2032	/* calc the descriptor location. */
2033	GCPtrDesc = X86DESC64_BASE(Desc);
2034	GCPtrDesc += (Sel & X86_SEL_MASK);
2035	}
2036
2037	/* read the descriptor. */
2038	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2039	if (RT_FAILURE(rc))
2040	{
2041	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
2042	if (RT_FAILURE(rc))
2043	return rc;
2044	Desc.au64[1] = 0;
2045	}
2046
2047	/*
2048	* Extract the base and limit
2049	* (We ignore the present bit here, which is probably a bit silly...)
2050	*/
2051	pSelInfo->Sel = Sel;
2052	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
2053	pSelInfo->u.Raw64 = Desc;
2054	if (Desc.Gen.u1DescType)
2055	{
2056	/*
2057	* 64-bit code selectors are wide open, it's not possible to detect
2058	* 64-bit data or stack selectors without also dragging in assumptions
2059	* about current CS (i.e. that's we're executing in 64-bit mode). So,
2060	* the selinfo user needs to deal with this in the context the info is
2061	* used unfortunately.
2062	*/
2063	if ( Desc.Gen.u1Long
2064	&& !Desc.Gen.u1DefBig
2065	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
2066	{
2067	/* Note! We ignore the segment limit hacks that was added by AMD. */
2068	pSelInfo->GCPtrBase = 0;
2069	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
2070	}
2071	else
2072	{
2073	pSelInfo->cbLimit = X86DESC_LIMIT(Desc);
2074	if (Desc.Gen.u1Granularity)
2075	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2076	pSelInfo->GCPtrBase = X86DESC_BASE(Desc);
2077	}
2078	pSelInfo->SelGate = 0;
2079	}
2080	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
2081	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
2082	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
2083	{
2084	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
2085	in the AMD manual here as a simplification. */
2086	pSelInfo->GCPtrBase = X86DESC64_BASE(Desc);
2087	pSelInfo->cbLimit = X86DESC_LIMIT(Desc);
2088	if (Desc.Gen.u1Granularity)
2089	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2090	pSelInfo->SelGate = 0;
2091	}
2092	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
2093	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
2094	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
2095	{
2096	pSelInfo->cbLimit = X86DESC64_BASE(Desc);
2097	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
2098	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
2099	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
2100	pSelInfo->SelGate = Desc.Gate.u16Sel;
2101	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2102	}
2103	else
2104	{
2105	pSelInfo->cbLimit = 0;
2106	pSelInfo->GCPtrBase = 0;
2107	pSelInfo->SelGate = 0;
2108	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2109	}
2110	if (!Desc.Gen.u1Present)
2111	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2112
2113	return VINF_SUCCESS;
2114	}
2115
2116
2117	/**
2118	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
2119	* interprets a legacy descriptor table entry and fills in the selector info
2120	* structure from it.
2121	*
2122	* @param pSelInfo Where to store the selector info. Only the fFlags and
2123	* Sel members have been initialized.
2124	* @param pDesc The legacy descriptor to parse.
2125	*/
2126	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
2127	{
2128	pSelInfo->u.Raw64.au64[1] = 0;
2129	pSelInfo->u.Raw = *pDesc;
2130	if ( pDesc->Gen.u1DescType
2131	\|\| !(pDesc->Gen.u4Type & 4))
2132	{
2133	pSelInfo->cbLimit = X86DESC_LIMIT(*pDesc);
2134	if (pDesc->Gen.u1Granularity)
2135	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2136	pSelInfo->GCPtrBase = X86DESC_BASE(*pDesc);
2137	pSelInfo->SelGate = 0;
2138	}
2139	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
2140	{
2141	pSelInfo->cbLimit = 0;
2142	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
2143	pSelInfo->GCPtrBase = 0;
2144	else
2145	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
2146	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
2147	pSelInfo->SelGate = pDesc->Gate.u16Sel;
2148	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2149	}
2150	else
2151	{
2152	pSelInfo->cbLimit = 0;
2153	pSelInfo->GCPtrBase = 0;
2154	pSelInfo->SelGate = 0;
2155	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2156	}
2157	if (!pDesc->Gen.u1Present)
2158	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2159	}
2160
2161
2162	/**
2163	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2164	*
2165	* See SELMR3GetSelectorInfo for details.
2166	*
2167	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2168	*
2169	* @param pVM VM handle.
2170	* @param pVCpu VMCPU handle.
2171	* @param Sel The selector to get info about.
2172	* @param pSelInfo Where to store the information.
2173	*/
2174	static int selmR3GetSelectorInfo32(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2175	{
2176	/*
2177	* Read the descriptor entry
2178	*/
2179	pSelInfo->fFlags = 0;
2180	X86DESC Desc;
2181	if ( !(Sel & X86_SEL_LDT)
2182	&& ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK)
2183	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK)
2184	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK)
2185	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK)
2186	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK))
2187	)
2188	{
2189	/*
2190	* Hypervisor descriptor.
2191	*/
2192	pSelInfo->fFlags = DBGFSELINFO_FLAGS_HYPER;
2193	if (CPUMIsGuestInProtectedMode(pVCpu))
2194	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2195	else
2196	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2197
2198	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2199	}
2200	else if (CPUMIsGuestInProtectedMode(pVCpu))
2201	{
2202	/*
2203	* Read it from the guest descriptor table.
2204	*/
2205	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
2206
2207	VBOXGDTR Gdtr;
2208	RTGCPTR GCPtrDesc;
2209	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2210	if (!(Sel & X86_SEL_LDT))
2211	{
2212	/* GDT */
2213	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2214	return VERR_INVALID_SELECTOR;
2215	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2216	}
2217	else
2218	{
2219	/*
2220	* LDT - must locate the LDT first...
2221	*/
2222	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2223	if ( (unsigned)(SelLdt & X86_SEL_MASK) < sizeof(X86DESC) /* the first selector is invalid, right? / /* @todo r=bird: No, I don't think so */
2224	\|\| (unsigned)(SelLdt & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2225	return VERR_INVALID_SELECTOR;
2226	GCPtrDesc = Gdtr.pGdt + (SelLdt & X86_SEL_MASK);
2227	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2228	if (RT_FAILURE(rc))
2229	return rc;
2230
2231	/* validate the LDT descriptor. */
2232	if (Desc.Gen.u1Present == 0)
2233	return VERR_SELECTOR_NOT_PRESENT;
2234	if ( Desc.Gen.u1DescType == 1
2235	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
2236	return VERR_INVALID_SELECTOR;
2237
2238	unsigned cbLimit = X86DESC_LIMIT(Desc);
2239	if (Desc.Gen.u1Granularity)
2240	cbLimit = (cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2241	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > cbLimit)
2242	return VERR_INVALID_SELECTOR;
2243
2244	/* calc the descriptor location. */
2245	GCPtrDesc = X86DESC_BASE(Desc);
2246	GCPtrDesc += (Sel & X86_SEL_MASK);
2247	}
2248
2249	/* read the descriptor. */
2250	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2251	if (RT_FAILURE(rc))
2252	return rc;
2253	}
2254	else
2255	{
2256	/*
2257	* We're in real mode.
2258	*/
2259	pSelInfo->Sel = Sel;
2260	pSelInfo->GCPtrBase = Sel << 4;
2261	pSelInfo->cbLimit = 0xffff;
2262	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
2263	pSelInfo->u.Raw64.au64[0] = 0;
2264	pSelInfo->u.Raw64.au64[1] = 0;
2265	pSelInfo->SelGate = 0;
2266	return VINF_SUCCESS;
2267	}
2268
2269	/*
2270	* Extract the base and limit or sel:offset for gates.
2271	*/
2272	pSelInfo->Sel = Sel;
2273	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2274
2275	return VINF_SUCCESS;
2276	}
2277
2278
2279	/**
2280	* Gets information about a selector.
2281	*
2282	* Intended for the debugger mostly and will prefer the guest descriptor tables
2283	* over the shadow ones.
2284	*
2285	* @retval VINF_SUCCESS on success.
2286	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2287	* descriptor table.
2288	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2289	* is not returned if the selector itself isn't present, you have to
2290	* check that for yourself (see DBGFSELINFO::fFlags).
2291	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2292	* pagetable or page backing the selector table wasn't present.
2293	* @returns Other VBox status code on other errors.
2294	*
2295	* @param pVM VM handle.
2296	* @param pVCpu The virtual CPU handle.
2297	* @param Sel The selector to get info about.
2298	* @param pSelInfo Where to store the information.
2299	*/
2300	VMMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2301	{
2302	AssertPtr(pSelInfo);
2303	if (CPUMIsGuestInLongMode(pVCpu))
2304	return selmR3GetSelectorInfo64(pVM, pVCpu, Sel, pSelInfo);
2305	return selmR3GetSelectorInfo32(pVM, pVCpu, Sel, pSelInfo);
2306	}
2307
2308
2309	/**
2310	* Gets information about a selector from the shadow tables.
2311	*
2312	* This is intended to be faster than the SELMR3GetSelectorInfo() method, but
2313	* requires that the caller ensures that the shadow tables are up to date.
2314	*
2315	* @retval VINF_SUCCESS on success.
2316	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2317	* descriptor table.
2318	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2319	* is not returned if the selector itself isn't present, you have to
2320	* check that for yourself (see DBGFSELINFO::fFlags).
2321	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2322	* pagetable or page backing the selector table wasn't present.
2323	* @returns Other VBox status code on other errors.
2324	*
2325	* @param pVM VM handle.
2326	* @param Sel The selector to get info about.
2327	* @param pSelInfo Where to store the information.
2328	*
2329	* @remarks Don't use this when in hardware assisted virtualization mode.
2330	*/
2331	VMMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PDBGFSELINFO pSelInfo)
2332	{
2333	Assert(pSelInfo);
2334
2335	/*
2336	* Read the descriptor entry
2337	*/
2338	X86DESC Desc;
2339	if (!(Sel & X86_SEL_LDT))
2340	{
2341	/*
2342	* Global descriptor.
2343	*/
2344	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2345	pSelInfo->fFlags = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK)
2346	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK)
2347	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK)
2348	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK)
2349	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK)
2350	? DBGFSELINFO_FLAGS_HYPER
2351	: 0;
2352	/** @todo check that the GDT offset is valid. */
2353	}
2354	else
2355	{
2356	/*
2357	* Local Descriptor.
2358	*/
2359	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2360	Desc = paLDT[Sel >> X86_SEL_SHIFT];
2361	/** @todo check if the LDT page is actually available. */
2362	/** @todo check that the LDT offset is valid. */
2363	pSelInfo->fFlags = 0;
2364	}
2365	if (CPUMIsGuestInProtectedMode(VMMGetCpu0(pVM)))
2366	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2367	else
2368	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2369
2370	/*
2371	* Extract the base and limit or sel:offset for gates.
2372	*/
2373	pSelInfo->Sel = Sel;
2374	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2375
2376	return VINF_SUCCESS;
2377	}
2378
2379
2380	/**
2381	* Formats a descriptor.
2382	*
2383	* @param Desc Descriptor to format.
2384	* @param Sel Selector number.
2385	* @param pszOutput Output buffer.
2386	* @param cchOutput Size of output buffer.
2387	*/
2388	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
2389	{
2390	/*
2391	* Make variable description string.
2392	*/
2393	static struct
2394	{
2395	unsigned cch;
2396	const char *psz;
2397	} const aTypes[32] =
2398	{
2399	#define STRENTRY(str) { sizeof(str) - 1, str }
2400	/* system */
2401	STRENTRY("Reserved0 "), /* 0x00 */
2402	STRENTRY("TSS16Avail "), /* 0x01 */
2403	STRENTRY("LDT "), /* 0x02 */
2404	STRENTRY("TSS16Busy "), /* 0x03 */
2405	STRENTRY("Call16 "), /* 0x04 */
2406	STRENTRY("Task "), /* 0x05 */
2407	STRENTRY("Int16 "), /* 0x06 */
2408	STRENTRY("Trap16 "), /* 0x07 */
2409	STRENTRY("Reserved8 "), /* 0x08 */
2410	STRENTRY("TSS32Avail "), /* 0x09 */
2411	STRENTRY("ReservedA "), /* 0x0a */
2412	STRENTRY("TSS32Busy "), /* 0x0b */
2413	STRENTRY("Call32 "), /* 0x0c */
2414	STRENTRY("ReservedD "), /* 0x0d */
2415	STRENTRY("Int32 "), /* 0x0e */
2416	STRENTRY("Trap32 "), /* 0x0f */
2417	/* non system */
2418	STRENTRY("DataRO "), /* 0x10 */
2419	STRENTRY("DataRO Accessed "), /* 0x11 */
2420	STRENTRY("DataRW "), /* 0x12 */
2421	STRENTRY("DataRW Accessed "), /* 0x13 */
2422	STRENTRY("DataDownRO "), /* 0x14 */
2423	STRENTRY("DataDownRO Accessed "), /* 0x15 */
2424	STRENTRY("DataDownRW "), /* 0x16 */
2425	STRENTRY("DataDownRW Accessed "), /* 0x17 */
2426	STRENTRY("CodeEO "), /* 0x18 */
2427	STRENTRY("CodeEO Accessed "), /* 0x19 */
2428	STRENTRY("CodeER "), /* 0x1a */
2429	STRENTRY("CodeER Accessed "), /* 0x1b */
2430	STRENTRY("CodeConfEO "), /* 0x1c */
2431	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
2432	STRENTRY("CodeConfER "), /* 0x1e */
2433	STRENTRY("CodeConfER Accessed ") /* 0x1f */
2434	#undef SYSENTRY
2435	};
2436	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
2437	char szMsg[128];
2438	char *psz = &szMsg[0];
2439	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
2440	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
2441	psz += aTypes[i].cch;
2442
2443	if (Desc.Gen.u1Present)
2444	ADD_STR(psz, "Present ");
2445	else
2446	ADD_STR(psz, "Not-Present ");
2447	if (Desc.Gen.u1Granularity)
2448	ADD_STR(psz, "Page ");
2449	if (Desc.Gen.u1DefBig)
2450	ADD_STR(psz, "32-bit ");
2451	else
2452	ADD_STR(psz, "16-bit ");
2453	#undef ADD_STR
2454	*psz = '\0';
2455
2456	/*
2457	* Limit and Base and format the output.
2458	*/
2459	uint32_t u32Limit = X86DESC_LIMIT(Desc);
2460	if (Desc.Gen.u1Granularity)
2461	u32Limit = u32Limit << PAGE_SHIFT \| PAGE_OFFSET_MASK;
2462	uint32_t u32Base = X86DESC_BASE(Desc);
2463
2464	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
2465	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
2466	}
2467
2468
2469	/**
2470	* Dumps a descriptor.
2471	*
2472	* @param Desc Descriptor to dump.
2473	* @param Sel Selector number.
2474	* @param pszMsg Message to prepend the log entry with.
2475	*/
2476	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
2477	{
2478	char szOutput[128];
2479	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
2480	Log(("%s: %s\n", pszMsg, szOutput));
2481	NOREF(szOutput[0]);
2482	}
2483
2484
2485	/**
2486	* Display the shadow gdt.
2487	*
2488	* @param pVM VM Handle.
2489	* @param pHlp The info helpers.
2490	* @param pszArgs Arguments, ignored.
2491	*/
2492	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2493	{
2494	pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%RRv):\n", MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3));
2495	for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
2496	{
2497	if (pVM->selm.s.paGdtR3[iGDT].Gen.u1Present)
2498	{
2499	char szOutput[128];
2500	selmR3FormatDescriptor(pVM->selm.s.paGdtR3[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2501	const char *psz = "";
2502	if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> X86_SEL_SHIFT))
2503	psz = " HyperCS";
2504	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> X86_SEL_SHIFT))
2505	psz = " HyperDS";
2506	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> X86_SEL_SHIFT))
2507	psz = " HyperCS64";
2508	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> X86_SEL_SHIFT))
2509	psz = " HyperTSS";
2510	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
2511	psz = " HyperTSSTrap08";
2512	pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
2513	}
2514	}
2515	}
2516
2517
2518	/**
2519	* Display the guest gdt.
2520	*
2521	* @param pVM VM Handle.
2522	* @param pHlp The info helpers.
2523	* @param pszArgs Arguments, ignored.
2524	*/
2525	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2526	{
2527	/** @todo SMP support! */
2528	PVMCPU pVCpu = &pVM->aCpus[0];
2529
2530	VBOXGDTR GDTR;
2531	CPUMGetGuestGDTR(pVCpu, &GDTR);
2532	RTGCPTR GCPtrGDT = GDTR.pGdt;
2533	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
2534
2535	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
2536	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
2537	{
2538	X86DESC GDTE;
2539	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
2540	if (RT_SUCCESS(rc))
2541	{
2542	if (GDTE.Gen.u1Present)
2543	{
2544	char szOutput[128];
2545	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2546	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2547	}
2548	}
2549	else if (rc == VERR_PAGE_NOT_PRESENT)
2550	{
2551	if ((GCPtrGDT & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2552	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
2553	}
2554	else
2555	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
2556	}
2557	}
2558
2559
2560	/**
2561	* Display the shadow ldt.
2562	*
2563	* @param pVM VM Handle.
2564	* @param pHlp The info helpers.
2565	* @param pszArgs Arguments, ignored.
2566	*/
2567	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2568	{
2569	unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
2570	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2571	pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%RRv limit=%#x):\n", pVM->selm.s.pvLdtRC + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
2572	for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
2573	{
2574	if (paLDT[iLDT].Gen.u1Present)
2575	{
2576	char szOutput[128];
2577	selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2578	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2579	}
2580	}
2581	}
2582
2583
2584	/**
2585	* Display the guest ldt.
2586	*
2587	* @param pVM VM Handle.
2588	* @param pHlp The info helpers.
2589	* @param pszArgs Arguments, ignored.
2590	*/
2591	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2592	{
2593	/** @todo SMP support! */
2594	PVMCPU pVCpu = &pVM->aCpus[0];
2595
2596	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2597	if (!(SelLdt & X86_SEL_MASK))
2598	{
2599	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
2600	return;
2601	}
2602
2603	RTGCPTR GCPtrLdt;
2604	unsigned cbLdt;
2605	int rc = SELMGetLDTFromSel(pVM, SelLdt, &GCPtrLdt, &cbLdt);
2606	if (RT_FAILURE(rc))
2607	{
2608	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): rc=%Rrc\n", SelLdt, rc);
2609	return;
2610	}
2611
2612	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RGv limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
2613	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
2614	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
2615	{
2616	X86DESC LdtE;
2617	rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
2618	if (RT_SUCCESS(rc))
2619	{
2620	if (LdtE.Gen.u1Present)
2621	{
2622	char szOutput[128];
2623	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2624	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2625	}
2626	}
2627	else if (rc == VERR_PAGE_NOT_PRESENT)
2628	{
2629	if ((GCPtrLdt & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2630	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
2631	}
2632	else
2633	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
2634	}
2635	}
2636
2637
2638	/**
2639	* Dumps the hypervisor GDT
2640	*
2641	* @param pVM VM handle.
2642	*/
2643	VMMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
2644	{
2645	DBGFR3Info(pVM, "gdt", NULL, NULL);
2646	}
2647
2648
2649	/**
2650	* Dumps the hypervisor LDT
2651	*
2652	* @param pVM VM handle.
2653	*/
2654	VMMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
2655	{
2656	DBGFR3Info(pVM, "ldt", NULL, NULL);
2657	}
2658
2659
2660	/**
2661	* Dumps the guest GDT
2662	*
2663	* @param pVM VM handle.
2664	*/
2665	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
2666	{
2667	DBGFR3Info(pVM, "gdtguest", NULL, NULL);
2668	}
2669
2670
2671	/**
2672	* Dumps the guest LDT
2673	*
2674	* @param pVM VM handle.
2675	*/
2676	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
2677	{
2678	DBGFR3Info(pVM, "ldtguest", NULL, NULL);
2679	}
2680

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source: vbox/trunk/src/VBox/VMM/SELM.cpp@ 29566

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