SELM.cpp@ 22493

Last change on this file since 22493 was 22480, checked in by vboxsync, 15 years ago
SSM,VMM,Devices,Main,VBoxBFE: Live snapshot/migration SSM API adjustments.
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1	/* $Id: SELM.cpp 22480 2009-08-26 17:14:13Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/** @page pg_selm SELM - The Selector Manager
23	*
24	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
25	* of a few hyper selector for the raw-mode context. In the hardware assisted
26	* virtualization mode its only task is to decode entries in the guest GDT or
27	* LDT once in a while.
28	*
29	* @see grp_selm
30	*
31	*
32	* @section seg_selm_shadowing Shadowing
33	*
34	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
35	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
36	* The idea is to do it in a more on-demand fashion when we get time. There
37	* also a whole bunch of issues with the current synchronization of all three
38	* tables, see notes and todos in the code.
39	*
40	* When the guest makes changes to the GDT we will try update the shadow copy
41	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
42	*
43	* When the guest make LDT changes we'll trigger a full resync of the LDT
44	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
45	*
46	* The TSS shadowing is limited to the fields we need to care about, namely SS0
47	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
48	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
49	* rather than go the SELMR3SyncTSS() route.
50	*
51	* When in raw-mode SELM also injects a few extra GDT selectors which are used
52	* by the raw-mode (hyper) context. These start their life at the high end of
53	* the table and will be relocated when the guest tries to make use of them...
54	* Well, that was that idea at least, only the code isn't quite there yet which
55	* is why we have trouble with guests which actually have a full sized GDT.
56	*
57	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
58	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
59	*
60	*/
61
62	/*******************************************************************************
63	* Header Files *
64	*******************************************************************************/
65	#define LOG_GROUP LOG_GROUP_SELM
66	#include <VBox/selm.h>
67	#include <VBox/cpum.h>
68	#include <VBox/stam.h>
69	#include <VBox/mm.h>
70	#include <VBox/ssm.h>
71	#include <VBox/pgm.h>
72	#include <VBox/trpm.h>
73	#include <VBox/dbgf.h>
74	#include "SELMInternal.h"
75	#include <VBox/vm.h>
76	#include <VBox/err.h>
77	#include <VBox/param.h>
78
79	#include <iprt/assert.h>
80	#include <VBox/log.h>
81	#include <iprt/asm.h>
82	#include <iprt/string.h>
83	#include <iprt/thread.h>
84	#include <iprt/string.h>
85
86
87	/**
88	* Enable or disable tracking of Guest's GDT/LDT/TSS.
89	* @{
90	*/
91	#define SELM_TRACK_GUEST_GDT_CHANGES
92	#define SELM_TRACK_GUEST_LDT_CHANGES
93	#define SELM_TRACK_GUEST_TSS_CHANGES
94	/** @} */
95
96	/**
97	* Enable or disable tracking of Shadow GDT/LDT/TSS.
98	* @{
99	*/
100	#define SELM_TRACK_SHADOW_GDT_CHANGES
101	#define SELM_TRACK_SHADOW_LDT_CHANGES
102	#define SELM_TRACK_SHADOW_TSS_CHANGES
103	/** @} */
104
105
106	/** SELM saved state version. */
107	#define SELM_SAVED_STATE_VERSION 5
108
109
110	/*******************************************************************************
111	* Internal Functions *
112	*******************************************************************************/
113	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
114	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPhase);
115	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
116	static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
117	static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
118	static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
119	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
120	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
121	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
122	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
123	//static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
124	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
125
126
127
128	/**
129	* Initializes the SELM.
130	*
131	* @returns VBox status code.
132	* @param pVM The VM to operate on.
133	*/
134	VMMR3DECL(int) SELMR3Init(PVM pVM)
135	{
136	LogFlow(("SELMR3Init\n"));
137
138	/*
139	* Assert alignment and sizes.
140	* (The TSS block requires contiguous back.)
141	*/
142	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
143	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
144	#if 0 /* doesn't work */
145	AssertCompile((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
146	AssertCompile((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
147	#endif
148	AssertRelease((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
149	AssertRelease((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
150	AssertRelease(sizeof(pVM->selm.s.Tss.IntRedirBitmap) == 0x20);
151
152	/*
153	* Init the structure.
154	*/
155	pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
156	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = (SELM_GDT_ELEMENTS - 0x1) << 3;
157	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = (SELM_GDT_ELEMENTS - 0x2) << 3;
158	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = (SELM_GDT_ELEMENTS - 0x3) << 3;
159	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = (SELM_GDT_ELEMENTS - 0x4) << 3;
160	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = (SELM_GDT_ELEMENTS - 0x5) << 3;
161
162	/*
163	* Allocate GDT table.
164	*/
165	int rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtR3[0]) * SELM_GDT_ELEMENTS,
166	PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtR3);
167	AssertRCReturn(rc, rc);
168
169	/*
170	* Allocate LDT area.
171	*/
172	rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.pvLdtR3);
173	AssertRCReturn(rc, rc);
174
175	/*
176	* Init Guest's and Shadow GDT, LDT, TSS changes control variables.
177	*/
178	pVM->selm.s.cbEffGuestGdtLimit = 0;
179	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
180	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
181	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
182
183	pVM->selm.s.paGdtRC = NIL_RTRCPTR; /* Must be set in SELMR3Relocate because of monitoring. */
184	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
185	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
186	pVM->selm.s.GCSelTss = RTSEL_MAX;
187
188	pVM->selm.s.fDisableMonitoring = false;
189	pVM->selm.s.fSyncTSSRing0Stack = false;
190
191	/* The I/O bitmap starts right after the virtual interrupt redirection bitmap. Outside the TSS on purpose; the CPU will not check it
192	* for I/O operations. */
193	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
194	/* bit set to 1 means no redirection */
195	memset(pVM->selm.s.Tss.IntRedirBitmap, 0xff, sizeof(pVM->selm.s.Tss.IntRedirBitmap));
196
197	/*
198	* Register the saved state data unit.
199	*/
200	rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
201	NULL, NULL, NULL,
202	NULL, selmR3Save, NULL,
203	NULL, selmR3Load, selmR3LoadDone);
204	if (RT_FAILURE(rc))
205	return rc;
206
207	/*
208	* Statistics.
209	*/
210	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.");
211	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.");
212	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.");
213	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.");
214	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.");
215	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.");
216	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.");
217	STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
218	STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
219
220	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.");
221	STAM_REG(pVM, &pVM->selm.s.StatScanForHyperSels, STAMTYPE_COUNTER, "/SELM/HyperSels/Scan", STAMUNIT_OCCURENCES, "The number of times we had find free hypervisor selectors.");
222
223	/*
224	* Default action when entering raw mode for the first time
225	*/
226	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
227	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
228	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
229	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
230
231	/*
232	* Register info handlers.
233	*/
234	DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
235	DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
236	DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
237	DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
238	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
239	//DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
240
241	return rc;
242	}
243
244
245	/**
246	* Finalizes HMA page attributes.
247	*
248	* @returns VBox status code.
249	* @param pVM The VM handle.
250	*/
251	VMMR3DECL(int) SELMR3InitFinalize(PVM pVM)
252	{
253	/** @cfgm{/DoubleFault,bool,false}
254	* Enables catching of double faults in the raw-mode context VMM code. This can
255	* be used when the tripple faults or hangs occure and one suspect an unhandled
256	* double fault. This is not enabled by default because it means making the
257	* hyper selectors writeable for all supervisor code, including the guest's.
258	* The double fault is a task switch and thus requires write access to the GDT
259	* of the TSS (to set it busy), to the old TSS (to store state), and to the Trap
260	* 8 TSS for the back link.
261	*/
262	bool f;
263	#if defined(DEBUG_bird)
264	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, true);
265	#else
266	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, false);
267	#endif
268	AssertLogRelRCReturn(rc, rc);
269	if (f)
270	{
271	PX86DESC paGdt = pVM->selm.s.paGdtR3;
272	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3]), sizeof(paGdt[0]),
273	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
274	AssertRC(rc);
275	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3]), sizeof(paGdt[0]),
276	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
277	AssertRC(rc);
278	rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]),
279	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
280	AssertRC(rc);
281	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]),
282	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
283	AssertRC(rc);
284	}
285	return VINF_SUCCESS;
286	}
287
288
289	/**
290	* Setup the hypervisor GDT selectors in our shadow table
291	*
292	* @param pVM The VM handle.
293	*/
294	static void selmR3SetupHyperGDTSelectors(PVM pVM)
295	{
296	PX86DESC paGdt = pVM->selm.s.paGdtR3;
297
298	/*
299	* Set up global code and data descriptors for use in the guest context.
300	* Both are wide open (base 0, limit 4GB)
301	*/
302	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> 3];
303	pDesc->Gen.u16LimitLow = 0xffff;
304	pDesc->Gen.u4LimitHigh = 0xf;
305	pDesc->Gen.u16BaseLow = 0;
306	pDesc->Gen.u8BaseHigh1 = 0;
307	pDesc->Gen.u8BaseHigh2 = 0;
308	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
309	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
310	pDesc->Gen.u2Dpl = 0; /* supervisor */
311	pDesc->Gen.u1Present = 1;
312	pDesc->Gen.u1Available = 0;
313	pDesc->Gen.u1Long = 0;
314	pDesc->Gen.u1DefBig = 1; /* def 32 bit */
315	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
316
317	/* data */
318	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> 3];
319	pDesc->Gen.u16LimitLow = 0xffff;
320	pDesc->Gen.u4LimitHigh = 0xf;
321	pDesc->Gen.u16BaseLow = 0;
322	pDesc->Gen.u8BaseHigh1 = 0;
323	pDesc->Gen.u8BaseHigh2 = 0;
324	pDesc->Gen.u4Type = X86_SEL_TYPE_RW_ACC;
325	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
326	pDesc->Gen.u2Dpl = 0; /* supervisor */
327	pDesc->Gen.u1Present = 1;
328	pDesc->Gen.u1Available = 0;
329	pDesc->Gen.u1Long = 0;
330	pDesc->Gen.u1DefBig = 1; /* big */
331	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
332
333	/* 64-bit mode code (& data?) */
334	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> 3];
335	pDesc->Gen.u16LimitLow = 0xffff;
336	pDesc->Gen.u4LimitHigh = 0xf;
337	pDesc->Gen.u16BaseLow = 0;
338	pDesc->Gen.u8BaseHigh1 = 0;
339	pDesc->Gen.u8BaseHigh2 = 0;
340	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
341	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
342	pDesc->Gen.u2Dpl = 0; /* supervisor */
343	pDesc->Gen.u1Present = 1;
344	pDesc->Gen.u1Available = 0;
345	pDesc->Gen.u1Long = 1; /* The Long (L) attribute bit. */
346	pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
347	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
348
349	/*
350	* TSS descriptor
351	*/
352	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
353	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
354	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
355	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
356	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
357	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
358	pDesc->Gen.u4LimitHigh = 0;
359	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
360	pDesc->Gen.u1DescType = 0; /* system */
361	pDesc->Gen.u2Dpl = 0; /* supervisor */
362	pDesc->Gen.u1Present = 1;
363	pDesc->Gen.u1Available = 0;
364	pDesc->Gen.u1Long = 0;
365	pDesc->Gen.u1DefBig = 0;
366	pDesc->Gen.u1Granularity = 0; /* byte limit */
367
368	/*
369	* TSS descriptor for trap 08
370	*/
371	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3];
372	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
373	pDesc->Gen.u4LimitHigh = 0;
374	RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.TssTrap08);
375	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
376	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
377	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
378	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
379	pDesc->Gen.u1DescType = 0; /* system */
380	pDesc->Gen.u2Dpl = 0; /* supervisor */
381	pDesc->Gen.u1Present = 1;
382	pDesc->Gen.u1Available = 0;
383	pDesc->Gen.u1Long = 0;
384	pDesc->Gen.u1DefBig = 0;
385	pDesc->Gen.u1Granularity = 0; /* byte limit */
386	}
387
388	/**
389	* Applies relocations to data and code managed by this
390	* component. This function will be called at init and
391	* whenever the VMM need to relocate it self inside the GC.
392	*
393	* @param pVM The VM.
394	*/
395	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
396	{
397	PX86DESC paGdt = pVM->selm.s.paGdtR3;
398	LogFlow(("SELMR3Relocate\n"));
399
400	for (unsigned i=0;i<pVM->cCPUs;i++)
401	{
402	PVMCPU pVCpu = &pVM->aCpus[i];
403
404	/*
405	* Update GDTR and selector.
406	*/
407	CPUMSetHyperGDTR(pVCpu, MMHyperR3ToRC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
408
409	/** @todo selector relocations should be a seperate operation? */
410	CPUMSetHyperCS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]);
411	CPUMSetHyperDS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
412	CPUMSetHyperES(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
413	CPUMSetHyperSS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
414	CPUMSetHyperTR(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]);
415	}
416
417	selmR3SetupHyperGDTSelectors(pVM);
418
419	/** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
420	/** @todo PGM knows the proper CR3 values these days, not CPUM. */
421	/*
422	* Update the TSSes.
423	*/
424	/* Only applies to raw mode which supports only 1 VCPU */
425	PVMCPU pVCpu = &pVM->aCpus[0];
426
427	/* Current TSS */
428	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
429	pVM->selm.s.Tss.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
430	pVM->selm.s.Tss.esp0 = VMMGetStackRC(pVM);
431	pVM->selm.s.Tss.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
432	pVM->selm.s.Tss.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
433	pVM->selm.s.Tss.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
434	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
435
436	/* trap 08 */
437	pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu); /* this should give use better survival chances. */
438	pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
439	pVM->selm.s.TssTrap08.ss = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
440	pVM->selm.s.TssTrap08.esp0 = VMMGetStackRC(pVM) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
441	pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
442	pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
443	pVM->selm.s.TssTrap08.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
444	pVM->selm.s.TssTrap08.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
445	pVM->selm.s.TssTrap08.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
446	pVM->selm.s.TssTrap08.fs = 0;
447	pVM->selm.s.TssTrap08.gs = 0;
448	pVM->selm.s.TssTrap08.selLdt = 0;
449	pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
450	pVM->selm.s.TssTrap08.ecx = VM_RC_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
451	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
452	pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
453	pVM->selm.s.TssTrap08.edx = VM_RC_ADDR(pVM, pVM); /* setup edx VM address. */
454	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
455	pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
456	pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
457	/* TRPM will be updating the eip */
458
459	if (!pVM->selm.s.fDisableMonitoring)
460	{
461	/*
462	* Update shadow GDT/LDT/TSS write access handlers.
463	*/
464	int rc;
465	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
466	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
467	{
468	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
469	AssertRC(rc);
470	}
471	pVM->selm.s.paGdtRC = MMHyperR3ToRC(pVM, paGdt);
472	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.paGdtRC,
473	pVM->selm.s.paGdtRC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
474	0, 0, "selmRCShadowGDTWriteHandler", 0, "Shadow GDT write access handler");
475	AssertRC(rc);
476	#endif
477	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
478	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
479	{
480	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
481	AssertRC(rc);
482	}
483	pVM->selm.s.pvMonShwTssRC = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
484	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvMonShwTssRC,
485	pVM->selm.s.pvMonShwTssRC + sizeof(pVM->selm.s.Tss) - 1,
486	0, 0, "selmRCShadowTSSWriteHandler", 0, "Shadow TSS write access handler");
487	AssertRC(rc);
488	#endif
489
490	/*
491	* Update the GC LDT region handler and address.
492	*/
493	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
494	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
495	{
496	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
497	AssertRC(rc);
498	}
499	#endif
500	pVM->selm.s.pvLdtRC = MMHyperR3ToRC(pVM, pVM->selm.s.pvLdtR3);
501	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
502	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvLdtRC,
503	pVM->selm.s.pvLdtRC + _64K + PAGE_SIZE - 1,
504	0, 0, "selmRCShadowLDTWriteHandler", 0, "Shadow LDT write access handler");
505	AssertRC(rc);
506	#endif
507	}
508	}
509
510
511	/**
512	* Terminates the SELM.
513	*
514	* Termination means cleaning up and freeing all resources,
515	* the VM it self is at this point powered off or suspended.
516	*
517	* @returns VBox status code.
518	* @param pVM The VM to operate on.
519	*/
520	VMMR3DECL(int) SELMR3Term(PVM pVM)
521	{
522	return 0;
523	}
524
525
526	/**
527	* The VM is being reset.
528	*
529	* For the SELM component this means that any GDT/LDT/TSS monitors
530	* needs to be removed.
531	*
532	* @param pVM VM handle.
533	*/
534	VMMR3DECL(void) SELMR3Reset(PVM pVM)
535	{
536	LogFlow(("SELMR3Reset:\n"));
537	VM_ASSERT_EMT(pVM);
538
539	/*
540	* Uninstall guest GDT/LDT/TSS write access handlers.
541	*/
542	int rc;
543	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
544	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
545	{
546	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
547	AssertRC(rc);
548	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
549	pVM->selm.s.GuestGdtr.cbGdt = 0;
550	}
551	pVM->selm.s.fGDTRangeRegistered = false;
552	#endif
553	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
554	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
555	{
556	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
557	AssertRC(rc);
558	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
559	}
560	#endif
561	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
562	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
563	{
564	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
565	AssertRC(rc);
566	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
567	pVM->selm.s.GCSelTss = RTSEL_MAX;
568	}
569	#endif
570
571	/*
572	* Re-initialize other members.
573	*/
574	pVM->selm.s.cbLdtLimit = 0;
575	pVM->selm.s.offLdtHyper = 0;
576	pVM->selm.s.cbMonitoredGuestTss = 0;
577
578	pVM->selm.s.fSyncTSSRing0Stack = false;
579
580	/*
581	* Default action when entering raw mode for the first time
582	*/
583	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
584	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
585	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
586	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
587	}
588
589	/**
590	* Disable GDT/LDT/TSS monitoring and syncing
591	*
592	* @param pVM The VM to operate on.
593	*/
594	VMMR3DECL(void) SELMR3DisableMonitoring(PVM pVM)
595	{
596	/*
597	* Uninstall guest GDT/LDT/TSS write access handlers.
598	*/
599	int rc;
600	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
601	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
602	{
603	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
604	AssertRC(rc);
605	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
606	pVM->selm.s.GuestGdtr.cbGdt = 0;
607	}
608	pVM->selm.s.fGDTRangeRegistered = false;
609	#endif
610	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
611	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
612	{
613	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
614	AssertRC(rc);
615	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
616	}
617	#endif
618	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
619	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
620	{
621	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
622	AssertRC(rc);
623	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
624	pVM->selm.s.GCSelTss = RTSEL_MAX;
625	}
626	#endif
627
628	/*
629	* Unregister shadow GDT/LDT/TSS write access handlers.
630	*/
631	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
632	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
633	{
634	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
635	AssertRC(rc);
636	pVM->selm.s.paGdtRC = NIL_RTRCPTR;
637	}
638	#endif
639	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
640	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
641	{
642	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
643	AssertRC(rc);
644	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
645	}
646	#endif
647	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
648	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
649	{
650	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
651	AssertRC(rc);
652	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
653	}
654	#endif
655
656	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
657	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
658	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
659	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
660
661	pVM->selm.s.fDisableMonitoring = true;
662	}
663
664
665	/**
666	* Execute state save operation.
667	*
668	* @returns VBox status code.
669	* @param pVM VM Handle.
670	* @param pSSM SSM operation handle.
671	*/
672	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
673	{
674	LogFlow(("selmR3Save:\n"));
675
676	/*
677	* Save the basic bits - fortunately all the other things can be resynced on load.
678	*/
679	PSELM pSelm = &pVM->selm.s;
680
681	SSMR3PutBool(pSSM, pSelm->fDisableMonitoring);
682	SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
683	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS]);
684	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_DS]);
685	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]);
686	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]); /* reserved for DS64. */
687	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS]);
688	return SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]);
689	}
690
691
692	/**
693	* Execute state load operation.
694	*
695	* @returns VBox status code.
696	* @param pVM VM Handle.
697	* @param pSSM SSM operation handle.
698	* @param uVersion Data layout version.
699	* @param uPhase The data phase.
700	*/
701	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPhase)
702	{
703	LogFlow(("selmR3Load:\n"));
704	Assert(uPhase == SSM_PHASE_FINAL); NOREF(uPhase);
705
706	/*
707	* Validate version.
708	*/
709	if (uVersion != SELM_SAVED_STATE_VERSION)
710	{
711	AssertMsgFailed(("selmR3Load: Invalid version uVersion=%d!\n", uVersion));
712	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
713	}
714
715	/*
716	* Do a reset.
717	*/
718	SELMR3Reset(pVM);
719
720	/* Get the monitoring flag. */
721	SSMR3GetBool(pSSM, &pVM->selm.s.fDisableMonitoring);
722
723	/* Get the TSS state flag. */
724	SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
725
726	/*
727	* Get the selectors.
728	*/
729	RTSEL SelCS;
730	SSMR3GetSel(pSSM, &SelCS);
731	RTSEL SelDS;
732	SSMR3GetSel(pSSM, &SelDS);
733	RTSEL SelCS64;
734	SSMR3GetSel(pSSM, &SelCS64);
735	RTSEL SelDS64;
736	SSMR3GetSel(pSSM, &SelDS64);
737	RTSEL SelTSS;
738	SSMR3GetSel(pSSM, &SelTSS);
739	RTSEL SelTSSTrap08;
740	SSMR3GetSel(pSSM, &SelTSSTrap08);
741
742	/* Copy the selectors; they will be checked during relocation. */
743	PSELM pSelm = &pVM->selm.s;
744	pSelm->aHyperSel[SELM_HYPER_SEL_CS] = SelCS;
745	pSelm->aHyperSel[SELM_HYPER_SEL_DS] = SelDS;
746	pSelm->aHyperSel[SELM_HYPER_SEL_CS64] = SelCS64;
747	pSelm->aHyperSel[SELM_HYPER_SEL_TSS] = SelTSS;
748	pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SelTSSTrap08;
749
750	return VINF_SUCCESS;
751	}
752
753
754	/**
755	* Sync the GDT, LDT and TSS after loading the state.
756	*
757	* Just to play save, we set the FFs to force syncing before
758	* executing GC code.
759	*
760	* @returns VBox status code.
761	* @param pVM VM Handle.
762	* @param pSSM SSM operation handle.
763	*/
764	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
765	{
766	PVMCPU pVCpu = VMMGetCpu(pVM);
767
768	LogFlow(("selmR3LoadDone:\n"));
769
770	/*
771	* Don't do anything if it's a load failure.
772	*/
773	int rc = SSMR3HandleGetStatus(pSSM);
774	if (RT_FAILURE(rc))
775	return VINF_SUCCESS;
776
777	/*
778	* Do the syncing if we're in protected mode.
779	*/
780	if (PGMGetGuestMode(pVCpu) != PGMMODE_REAL)
781	{
782	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
783	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
784	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
785	SELMR3UpdateFromCPUM(pVM, pVCpu);
786	}
787
788	/*
789	* Flag everything for resync on next raw mode entry.
790	*/
791	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
792	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
793	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
794
795	return VINF_SUCCESS;
796	}
797
798
799	/**
800	* Updates the Guest GDT & LDT virtualization based on current CPU state.
801	*
802	* @returns VBox status code.
803	* @param pVM The VM to operate on.
804	* @param pVCpu The VMCPU to operate on.
805	*/
806	VMMR3DECL(int) SELMR3UpdateFromCPUM(PVM pVM, PVMCPU pVCpu)
807	{
808	int rc = VINF_SUCCESS;
809
810	if (pVM->selm.s.fDisableMonitoring)
811	{
812	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
813	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
814	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
815
816	return VINF_SUCCESS;
817	}
818
819	STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
820
821	/*
822	* GDT sync
823	*/
824	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
825	{
826	/*
827	* Always assume the best
828	*/
829	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
830
831	/* If the GDT was changed, then make sure the LDT is checked too */
832	/** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
833	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
834	/* Same goes for the TSS selector */
835	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
836
837	/*
838	* Get the GDTR and check if there is anything to do (there usually is).
839	*/
840	VBOXGDTR GDTR;
841	CPUMGetGuestGDTR(pVCpu, &GDTR);
842	if (GDTR.cbGdt < sizeof(X86DESC))
843	{
844	Log(("No GDT entries...\n"));
845	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
846	return VINF_SUCCESS;
847	}
848
849	/*
850	* Read the Guest GDT.
851	* ASSUMES that the entire GDT is in memory.
852	*/
853	RTUINT cbEffLimit = GDTR.cbGdt;
854	PX86DESC pGDTE = &pVM->selm.s.paGdtR3[1];
855	rc = PGMPhysSimpleReadGCPtr(pVCpu, pGDTE, GDTR.pGdt + sizeof(X86DESC), cbEffLimit + 1 - sizeof(X86DESC));
856	if (RT_FAILURE(rc))
857	{
858	/*
859	* Read it page by page.
860	*
861	* Keep track of the last valid page and delay memsets and
862	* adjust cbEffLimit to reflect the effective size. The latter
863	* is something we do in the belief that the guest will probably
864	* never actually commit the last page, thus allowing us to keep
865	* our selectors in the high end of the GDT.
866	*/
867	RTUINT cbLeft = cbEffLimit + 1 - sizeof(X86DESC);
868	RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(X86DESC);
869	uint8_t pu8Dst = (uint8_t )&pVM->selm.s.paGdtR3[1];
870	uint8_t *pu8DstInvalid = pu8Dst;
871
872	while (cbLeft)
873	{
874	RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
875	cb = RT_MIN(cb, cbLeft);
876	rc = PGMPhysSimpleReadGCPtr(pVCpu, pu8Dst, GCPtrSrc, cb);
877	if (RT_SUCCESS(rc))
878	{
879	if (pu8DstInvalid != pu8Dst)
880	memset(pu8DstInvalid, 0, pu8Dst - pu8DstInvalid);
881	GCPtrSrc += cb;
882	pu8Dst += cb;
883	pu8DstInvalid = pu8Dst;
884	}
885	else if ( rc == VERR_PAGE_NOT_PRESENT
886	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
887	{
888	GCPtrSrc += cb;
889	pu8Dst += cb;
890	}
891	else
892	{
893	AssertReleaseMsgFailed(("Couldn't read GDT at %016RX64, rc=%Rrc!\n", GDTR.pGdt, rc));
894	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
895	return VERR_NOT_IMPLEMENTED;
896	}
897	cbLeft -= cb;
898	}
899
900	/* any invalid pages at the end? */
901	if (pu8DstInvalid != pu8Dst)
902	{
903	cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtR3 - 1;
904	/* If any GDTEs was invalidated, zero them. */
905	if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
906	memset(pu8DstInvalid + cbEffLimit + 1, 0, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
907	}
908
909	/* keep track of the effective limit. */
910	if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
911	{
912	Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
913	pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
914	pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
915	}
916	}
917
918	/*
919	* Check if the Guest GDT intrudes on our GDT entries.
920	*/
921	/** @todo we should try to minimize relocations by making sure our current selectors can be reused. */
922	RTSEL aHyperSel[SELM_HYPER_SEL_MAX];
923	if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
924	{
925	PX86DESC pGDTEStart = pVM->selm.s.paGdtR3;
926	PX86DESC pGDTE = (PX86DESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(X86DESC));
927	int iGDT = 0;
928
929	Log(("Internal SELM GDT conflict: use non-present entries\n"));
930	STAM_COUNTER_INC(&pVM->selm.s.StatScanForHyperSels);
931	while (pGDTE > pGDTEStart)
932	{
933	/* We can reuse non-present entries */
934	if (!pGDTE->Gen.u1Present)
935	{
936	aHyperSel[iGDT] = ((uintptr_t)pGDTE - (uintptr_t)pVM->selm.s.paGdtR3) / sizeof(X86DESC);
937	aHyperSel[iGDT] = aHyperSel[iGDT] << X86_SEL_SHIFT;
938	Log(("SELM: Found unused GDT %04X\n", aHyperSel[iGDT]));
939	iGDT++;
940	if (iGDT >= SELM_HYPER_SEL_MAX)
941	break;
942	}
943
944	pGDTE--;
945	}
946	if (iGDT != SELM_HYPER_SEL_MAX)
947	{
948	AssertReleaseMsgFailed(("Internal SELM GDT conflict.\n"));
949	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
950	return VERR_NOT_IMPLEMENTED;
951	}
952	}
953	else
954	{
955	aHyperSel[SELM_HYPER_SEL_CS] = SELM_HYPER_DEFAULT_SEL_CS;
956	aHyperSel[SELM_HYPER_SEL_DS] = SELM_HYPER_DEFAULT_SEL_DS;
957	aHyperSel[SELM_HYPER_SEL_CS64] = SELM_HYPER_DEFAULT_SEL_CS64;
958	aHyperSel[SELM_HYPER_SEL_TSS] = SELM_HYPER_DEFAULT_SEL_TSS;
959	aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SELM_HYPER_DEFAULT_SEL_TSS_TRAP08;
960	}
961
962	/*
963	* Work thru the copied GDT entries adjusting them for correct virtualization.
964	*/
965	PX86DESC pGDTEEnd = (PX86DESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(X86DESC));
966	while (pGDTE < pGDTEEnd)
967	{
968	if (pGDTE->Gen.u1Present)
969	{
970	/*
971	* Code and data selectors are generally 1:1, with the
972	* 'little' adjustment we do for DPL 0 selectors.
973	*/
974	if (pGDTE->Gen.u1DescType)
975	{
976	/*
977	* Hack for A-bit against Trap E on read-only GDT.
978	*/
979	/** @todo Fix this by loading ds and cs before turning off WP. */
980	pGDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
981
982	/*
983	* All DPL 0 code and data segments are squeezed into DPL 1.
984	*
985	* We're skipping conforming segments here because those
986	* cannot give us any trouble.
987	*/
988	if ( pGDTE->Gen.u2Dpl == 0
989	&& (pGDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
990	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
991	pGDTE->Gen.u2Dpl = 1;
992	}
993	else
994	{
995	/*
996	* System type selectors are marked not present.
997	* Recompiler or special handling is required for these.
998	*/
999	/** @todo what about interrupt gates and rawr0? */
1000	pGDTE->Gen.u1Present = 0;
1001	}
1002	}
1003
1004	/* Next GDT entry. */
1005	pGDTE++;
1006	}
1007
1008	/*
1009	* Check if our hypervisor selectors were changed.
1010	*/
1011	if ( aHyperSel[SELM_HYPER_SEL_CS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]
1012	\|\| aHyperSel[SELM_HYPER_SEL_DS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]
1013	\|\| aHyperSel[SELM_HYPER_SEL_CS64] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64]
1014	\|\| aHyperSel[SELM_HYPER_SEL_TSS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]
1015	\|\| aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08])
1016	{
1017	/* Reinitialize our hypervisor GDTs */
1018	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = aHyperSel[SELM_HYPER_SEL_CS];
1019	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = aHyperSel[SELM_HYPER_SEL_DS];
1020	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = aHyperSel[SELM_HYPER_SEL_CS64];
1021	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = aHyperSel[SELM_HYPER_SEL_TSS];
1022	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
1023
1024	STAM_COUNTER_INC(&pVM->selm.s.StatHyperSelsChanged);
1025
1026	/*
1027	* Do the relocation callbacks to let everyone update their hyper selector dependencies.
1028	* (SELMR3Relocate will call selmR3SetupHyperGDTSelectors() for us.)
1029	*/
1030	VMR3Relocate(pVM, 0);
1031	}
1032	else if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
1033	/* We overwrote all entries above, so we have to save them again. */
1034	selmR3SetupHyperGDTSelectors(pVM);
1035
1036	/*
1037	* Adjust the cached GDT limit.
1038	* Any GDT entries which have been removed must be cleared.
1039	*/
1040	if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
1041	{
1042	if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
1043	memset(pGDTE, 0, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
1044	#ifndef SELM_TRACK_GUEST_GDT_CHANGES
1045	pVM->selm.s.GuestGdtr.cbGdt = GDTR.cbGdt;
1046	#endif
1047	}
1048
1049	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
1050	/*
1051	* Check if Guest's GDTR is changed.
1052	*/
1053	if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
1054	\|\| GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1055	{
1056	Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%016RX64 cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
1057
1058	/*
1059	* [Re]Register write virtual handler for guest's GDT.
1060	*/
1061	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
1062	{
1063	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
1064	AssertRC(rc);
1065	}
1066
1067	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1068	0, selmR3GuestGDTWriteHandler, "selmRCGuestGDTWriteHandler", 0, "Guest GDT write access handler");
1069	if (RT_FAILURE(rc))
1070	return rc;
1071
1072	/* Update saved Guest GDTR. */
1073	pVM->selm.s.GuestGdtr = GDTR;
1074	pVM->selm.s.fGDTRangeRegistered = true;
1075	}
1076	#endif
1077	}
1078
1079	/*
1080	* TSS sync
1081	*/
1082	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1083	{
1084	SELMR3SyncTSS(pVM, pVCpu);
1085	}
1086
1087	/*
1088	* LDT sync
1089	*/
1090	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_LDT))
1091	{
1092	/*
1093	* Always assume the best
1094	*/
1095	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
1096
1097	/*
1098	* LDT handling is done similarly to the GDT handling with a shadow
1099	* array. However, since the LDT is expected to be swappable (at least
1100	* some ancient OSes makes it swappable) it must be floating and
1101	* synced on a per-page basis.
1102	*
1103	* Eventually we will change this to be fully on demand. Meaning that
1104	* we will only sync pages containing LDT selectors actually used and
1105	* let the #PF handler lazily sync pages as they are used.
1106	* (This applies to GDT too, when we start making OS/2 fast.)
1107	*/
1108
1109	/*
1110	* First, determin the current LDT selector.
1111	*/
1112	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1113	if ((SelLdt & X86_SEL_MASK) == 0)
1114	{
1115	/* ldtr = 0 - update hyper LDTR and deregister any active handler. */
1116	CPUMSetHyperLDTR(pVCpu, 0);
1117	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1118	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1119	{
1120	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1121	AssertRC(rc);
1122	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1123	}
1124	#endif
1125	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1126	return VINF_SUCCESS;
1127	}
1128
1129	/*
1130	* Get the LDT selector.
1131	*/
1132	PX86DESC pDesc = &pVM->selm.s.paGdtR3[SelLdt >> X86_SEL_SHIFT];
1133	RTGCPTR GCPtrLdt = X86DESC_BASE(*pDesc);
1134	unsigned cbLdt = X86DESC_LIMIT(*pDesc);
1135	if (pDesc->Gen.u1Granularity)
1136	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1137
1138	/*
1139	* Validate it.
1140	*/
1141	if ( !cbLdt
1142	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
1143	\|\| pDesc->Gen.u1DescType
1144	\|\| pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1145	{
1146	AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
1147
1148	/* cbLdt > 0:
1149	* This is quite impossible, so we do as most people do when faced with
1150	* the impossible, we simply ignore it.
1151	*/
1152	CPUMSetHyperLDTR(pVCpu, 0);
1153	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1154	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1155	{
1156	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1157	AssertRC(rc);
1158	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1159	}
1160	#endif
1161	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1162	return VINF_SUCCESS;
1163	}
1164	/** @todo check what intel does about odd limits. */
1165	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1166
1167	/*
1168	* Use the cached guest ldt address if the descriptor has already been modified (see below)
1169	* (this is necessary due to redundant LDT updates; see todo above at GDT sync)
1170	*/
1171	if (MMHyperIsInsideArea(pVM, GCPtrLdt))
1172	GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
1173
1174
1175	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1176	/** @todo Handle only present LDT segments. */
1177	// if (pDesc->Gen.u1Present)
1178	{
1179	/*
1180	* Check if Guest's LDT address/limit is changed.
1181	*/
1182	if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
1183	\|\| cbLdt != pVM->selm.s.cbLdtLimit)
1184	{
1185	Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %RGv:%04x to %RGv:%04x. (GDTR=%016RX64:%04x)\n",
1186	pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1187
1188	/*
1189	* [Re]Register write virtual handler for guest's GDT.
1190	* In the event of LDT overlapping something, don't install it just assume it's being updated.
1191	*/
1192	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1193	{
1194	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1195	AssertRC(rc);
1196	}
1197	#ifdef DEBUG
1198	if (pDesc->Gen.u1Present)
1199	Log(("LDT selector marked not present!!\n"));
1200	#endif
1201	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
1202	0, selmR3GuestLDTWriteHandler, "selmRCGuestLDTWriteHandler", 0, "Guest LDT write access handler");
1203	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1204	{
1205	/** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
1206	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1207	Log(("WARNING: Guest LDT (%RGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%016RX64:%04x)\n",
1208	GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1209	}
1210	else if (RT_SUCCESS(rc))
1211	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1212	else
1213	{
1214	CPUMSetHyperLDTR(pVCpu, 0);
1215	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1216	return rc;
1217	}
1218
1219	pVM->selm.s.cbLdtLimit = cbLdt;
1220	}
1221	}
1222	#else
1223	pVM->selm.s.cbLdtLimit = cbLdt;
1224	#endif
1225
1226	/*
1227	* Calc Shadow LDT base.
1228	*/
1229	unsigned off;
1230	pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
1231	RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.pvLdtRC + off);
1232	PX86DESC pShadowLDT = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1233
1234	/*
1235	* Enable the LDT selector in the shadow GDT.
1236	*/
1237	pDesc->Gen.u1Present = 1;
1238	pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
1239	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
1240	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
1241	pDesc->Gen.u1Available = 0;
1242	pDesc->Gen.u1Long = 0;
1243	if (cbLdt > 0xffff)
1244	{
1245	cbLdt = 0xffff;
1246	pDesc->Gen.u4LimitHigh = 0;
1247	pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
1248	}
1249
1250	/*
1251	* Set Hyper LDTR and notify TRPM.
1252	*/
1253	CPUMSetHyperLDTR(pVCpu, SelLdt);
1254
1255	/*
1256	* Loop synchronising the LDT page by page.
1257	*/
1258	/** @todo investigate how intel handle various operations on half present cross page entries. */
1259	off = GCPtrLdt & (sizeof(X86DESC) - 1);
1260	AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
1261
1262	/* Note: Do not skip the first selector; unlike the GDT, a zero LDT selector is perfectly valid. */
1263	unsigned cbLeft = cbLdt + 1;
1264	PX86DESC pLDTE = pShadowLDT;
1265	while (cbLeft)
1266	{
1267	/*
1268	* Read a chunk.
1269	*/
1270	unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
1271	if (cbChunk > cbLeft)
1272	cbChunk = cbLeft;
1273	rc = PGMPhysSimpleReadGCPtr(pVCpu, pShadowLDT, GCPtrLdt, cbChunk);
1274	if (RT_SUCCESS(rc))
1275	{
1276	/*
1277	* Mark page
1278	*/
1279	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
1280	AssertRC(rc);
1281
1282	/*
1283	* Loop thru the available LDT entries.
1284	* Figure out where to start and end and the potential cross pageness of
1285	* things adds a little complexity. pLDTE is updated there and not in the
1286	* 'next' part of the loop. The pLDTEEnd is inclusive.
1287	*/
1288	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
1289	if (pLDTE + 1 < pShadowLDT)
1290	pLDTE = (PX86DESC)((uintptr_t)pShadowLDT + off);
1291	while (pLDTE <= pLDTEEnd)
1292	{
1293	if (pLDTE->Gen.u1Present)
1294	{
1295	/*
1296	* Code and data selectors are generally 1:1, with the
1297	* 'little' adjustment we do for DPL 0 selectors.
1298	*/
1299	if (pLDTE->Gen.u1DescType)
1300	{
1301	/*
1302	* Hack for A-bit against Trap E on read-only GDT.
1303	*/
1304	/** @todo Fix this by loading ds and cs before turning off WP. */
1305	if (!(pLDTE->Gen.u4Type & X86_SEL_TYPE_ACCESSED))
1306	pLDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
1307
1308	/*
1309	* All DPL 0 code and data segments are squeezed into DPL 1.
1310	*
1311	* We're skipping conforming segments here because those
1312	* cannot give us any trouble.
1313	*/
1314	if ( pLDTE->Gen.u2Dpl == 0
1315	&& (pLDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
1316	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
1317	pLDTE->Gen.u2Dpl = 1;
1318	}
1319	else
1320	{
1321	/*
1322	* System type selectors are marked not present.
1323	* Recompiler or special handling is required for these.
1324	*/
1325	/** @todo what about interrupt gates and rawr0? */
1326	pLDTE->Gen.u1Present = 0;
1327	}
1328	}
1329
1330	/* Next LDT entry. */
1331	pLDTE++;
1332	}
1333	}
1334	else
1335	{
1336	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%Rrc\n", rc));
1337	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
1338	AssertRC(rc);
1339	}
1340
1341	/*
1342	* Advance to the next page.
1343	*/
1344	cbLeft -= cbChunk;
1345	GCPtrShadowLDT += cbChunk;
1346	pShadowLDT = (PX86DESC)((char *)pShadowLDT + cbChunk);
1347	GCPtrLdt += cbChunk;
1348	}
1349	}
1350
1351	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1352	return VINF_SUCCESS;
1353	}
1354
1355
1356	/**
1357	* \#PF Handler callback for virtual access handler ranges.
1358	*
1359	* Important to realize that a physical page in a range can have aliases, and
1360	* for ALL and WRITE handlers these will also trigger.
1361	*
1362	* @returns VINF_SUCCESS if the handler have carried out the operation.
1363	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1364	* @param pVM VM Handle.
1365	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1366	* @param pvPtr The HC mapping of that address.
1367	* @param pvBuf What the guest is reading/writing.
1368	* @param cbBuf How much it's reading/writing.
1369	* @param enmAccessType The access type.
1370	* @param pvUser User argument.
1371	*/
1372	static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1373	{
1374	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1375	Log(("selmR3GuestGDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf));
1376
1377	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_GDT);
1378	return VINF_PGM_HANDLER_DO_DEFAULT;
1379	}
1380
1381
1382	/**
1383	* \#PF Handler callback for virtual access handler ranges.
1384	*
1385	* Important to realize that a physical page in a range can have aliases, and
1386	* for ALL and WRITE handlers these will also trigger.
1387	*
1388	* @returns VINF_SUCCESS if the handler have carried out the operation.
1389	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1390	* @param pVM VM Handle.
1391	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1392	* @param pvPtr The HC mapping of that address.
1393	* @param pvBuf What the guest is reading/writing.
1394	* @param cbBuf How much it's reading/writing.
1395	* @param enmAccessType The access type.
1396	* @param pvUser User argument.
1397	*/
1398	static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1399	{
1400	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1401	Log(("selmR3GuestLDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf));
1402	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_LDT);
1403	return VINF_PGM_HANDLER_DO_DEFAULT;
1404	}
1405
1406
1407	/**
1408	* \#PF Handler callback for virtual access handler ranges.
1409	*
1410	* Important to realize that a physical page in a range can have aliases, and
1411	* for ALL and WRITE handlers these will also trigger.
1412	*
1413	* @returns VINF_SUCCESS if the handler have carried out the operation.
1414	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1415	* @param pVM VM Handle.
1416	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1417	* @param pvPtr The HC mapping of that address.
1418	* @param pvBuf What the guest is reading/writing.
1419	* @param cbBuf How much it's reading/writing.
1420	* @param enmAccessType The access type.
1421	* @param pvUser User argument.
1422	*/
1423	static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1424	{
1425	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1426	Log(("selmR3GuestTSSWriteHandler: write %.*Rhxs to %RGv size %d\n", RT_MIN(8, cbBuf), pvBuf, GCPtr, cbBuf));
1427
1428	/** @todo This can be optimized by checking for the ESP0 offset and tracking TR
1429	* reloads in REM (setting VM_FF_SELM_SYNC_TSS if TR is reloaded). We
1430	* should probably also deregister the virtual handler if TR.base/size
1431	* changes while we're in REM. */
1432
1433	VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_TSS);
1434
1435	return VINF_PGM_HANDLER_DO_DEFAULT;
1436	}
1437
1438
1439	/**
1440	* Synchronize the shadowed fields in the TSS.
1441	*
1442	* At present we're shadowing the ring-0 stack selector & pointer, and the
1443	* interrupt redirection bitmap (if present). We take the lazy approach wrt to
1444	* REM and this function is called both if REM made any changes to the TSS or
1445	* loaded TR.
1446	*
1447	* @returns VBox status code.
1448	* @param pVM The VM to operate on.
1449	* @param pVCpu The VMCPU to operate on.
1450	*/
1451	VMMR3DECL(int) SELMR3SyncTSS(PVM pVM, PVMCPU pVCpu)
1452	{
1453	int rc;
1454
1455	if (pVM->selm.s.fDisableMonitoring)
1456	{
1457	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1458	return VINF_SUCCESS;
1459	}
1460
1461	STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
1462	Assert(VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS));
1463
1464	/*
1465	* Get TR and extract and store the basic info.
1466	*
1467	* Note! The TSS limit is not checked by the LTR code, so we
1468	* have to be a bit careful with it. We make sure cbTss
1469	* won't be zero if TR is valid and if it's NULL we'll
1470	* make sure cbTss is 0.
1471	*/
1472	CPUMSELREGHID trHid;
1473	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1474	RTGCPTR GCPtrTss = trHid.u64Base;
1475	uint32_t cbTss = trHid.u32Limit;
1476	Assert( (SelTss & X86_SEL_MASK)
1477	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1478	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1479	if (SelTss & X86_SEL_MASK)
1480	{
1481	Assert(!(SelTss & X86_SEL_LDT));
1482	Assert(trHid.Attr.n.u1DescType == 0);
1483	Assert( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1484	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY);
1485	if (!++cbTss)
1486	cbTss = UINT32_MAX;
1487	}
1488	else
1489	{
1490	Assert( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1491	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1492	cbTss = 0; /* the reset case. */
1493	}
1494	pVM->selm.s.cbGuestTss = cbTss;
1495	pVM->selm.s.fGuestTss32Bit = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1496	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1497
1498	/*
1499	* Figure out the size of what need to monitor.
1500	*/
1501	/* We're not interested in any 16-bit TSSes. */
1502	uint32_t cbMonitoredTss = cbTss;
1503	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1504	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1505	cbMonitoredTss = 0;
1506
1507	pVM->selm.s.offGuestIoBitmap = 0;
1508	bool fNoRing1Stack = true;
1509	if (cbMonitoredTss)
1510	{
1511	/*
1512	* 32-bit TSS. What we're really keen on is the SS0 and ESP0 fields.
1513	* If VME is enabled we also want to keep an eye on the interrupt
1514	* redirection bitmap.
1515	*/
1516	VBOXTSS Tss;
1517	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1518	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1519	if ( !(cr4 & X86_CR4_VME)
1520	\|\| ( VBOX_SUCCESS(rc)
1521	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1522	&& Tss.offIoBitmap > cbTss) /* beyond the end / /* @todo not sure how the partial case is handled; probably not allowed. */
1523	)
1524	/* No interrupt redirection bitmap, just ESP0 and SS0. */
1525	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1526	else if (RT_SUCCESS(rc))
1527	{
1528	/*
1529	* Everything up to and including the interrupt redirection bitmap. Unfortunately
1530	* this can be quite a large chunk. We use to skip it earlier and just hope it
1531	* was kind of static...
1532	*
1533	* Update the virtual interrupt redirection bitmap while we're here.
1534	* (It is located in the 32 bytes before TR:offIoBitmap.)
1535	*/
1536	cbMonitoredTss = Tss.offIoBitmap;
1537	pVM->selm.s.offGuestIoBitmap = Tss.offIoBitmap;
1538
1539	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1540	rc = PGMPhysSimpleReadGCPtr(pVCpu, &pVM->selm.s.Tss.IntRedirBitmap,
1541	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1542	AssertRC(rc);
1543	/** @todo memset the bitmap on failure? */
1544	Log2(("Redirection bitmap:\n"));
1545	Log2(("%.*Rhxd\n", sizeof(Tss.IntRedirBitmap), &pVM->selm.s.Tss.IntRedirBitmap));
1546	}
1547	else
1548	{
1549	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1550	pVM->selm.s.offGuestIoBitmap = 0;
1551	/** @todo memset the bitmap? */
1552	}
1553
1554	/*
1555	* Update the ring 0 stack selector and base address.
1556	*/
1557	if (RT_SUCCESS(rc))
1558	{
1559	#ifdef LOG_ENABLED
1560	if (LogIsEnabled())
1561	{
1562	uint32_t ssr0, espr0;
1563	SELMGetRing1Stack(pVM, &ssr0, &espr0);
1564	if ((ssr0 & ~1) != Tss.ss0 \|\| espr0 != Tss.esp0)
1565	{
1566	RTGCPHYS GCPhys = NIL_RTGCPHYS;
1567	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1568	Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X from %04X:%08X; TSS Phys=%VGp)\n",
1569	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1570	AssertMsg(ssr0 != Tss.ss0,
1571	("ring-1 leak into TSS.SS0! %04X:%08X from %04X:%08X; TSS Phys=%VGp)\n",
1572	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1573	}
1574	Log(("offIoBitmap=%#x\n", Tss.offIoBitmap));
1575	}
1576	#endif /* LOG_ENABLED */
1577	AssertMsg(!(Tss.ss0 & 3), ("ring-1 leak into TSS.SS0? %04X:%08X\n", Tss.ss0, Tss.esp0));
1578
1579	/* Update our TSS structure for the guest's ring 1 stack */
1580	selmSetRing1Stack(pVM, Tss.ss0 \| 1, Tss.esp0);
1581	pVM->selm.s.fSyncTSSRing0Stack = fNoRing1Stack = false;
1582	}
1583	}
1584
1585	/*
1586	* Flush the ring-1 stack and the direct syscall dispatching if we
1587	* cannot obtain SS0:ESP0.
1588	*/
1589	if (fNoRing1Stack)
1590	{
1591	selmSetRing1Stack(pVM, 0 /* invalid SS */, 0);
1592	pVM->selm.s.fSyncTSSRing0Stack = cbMonitoredTss != 0;
1593
1594	/** @todo handle these dependencies better! */
1595	TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
1596	TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
1597	}
1598
1599	/*
1600	* Check for monitor changes and apply them.
1601	*/
1602	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1603	\|\| cbMonitoredTss != pVM->selm.s.cbMonitoredGuestTss)
1604	{
1605	Log(("SELMR3SyncTSS: Guest's TSS is changed to pTss=%RGv cbMonitoredTss=%08X cbGuestTss=%#08x\n",
1606	GCPtrTss, cbMonitoredTss, pVM->selm.s.cbGuestTss));
1607
1608	/* Release the old range first. */
1609	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
1610	{
1611	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
1612	AssertRC(rc);
1613	}
1614
1615	/* Register the write handler if TS != 0. */
1616	if (cbMonitoredTss != 0)
1617	{
1618	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1619	0, selmR3GuestTSSWriteHandler,
1620	"selmRCGuestTSSWriteHandler", 0, "Guest TSS write access handler");
1621	if (RT_FAILURE(rc))
1622	{
1623	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1624	return rc;
1625	}
1626
1627	/* Update saved Guest TSS info. */
1628	pVM->selm.s.GCPtrGuestTss = GCPtrTss;
1629	pVM->selm.s.cbMonitoredGuestTss = cbMonitoredTss;
1630	pVM->selm.s.GCSelTss = SelTss;
1631	}
1632	else
1633	{
1634	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
1635	pVM->selm.s.cbMonitoredGuestTss = 0;
1636	pVM->selm.s.GCSelTss = 0;
1637	}
1638	}
1639
1640	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1641
1642	STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
1643	return VINF_SUCCESS;
1644	}
1645
1646
1647	/**
1648	* Compares the Guest GDT and LDT with the shadow tables.
1649	* This is a VBOX_STRICT only function.
1650	*
1651	* @returns VBox status code.
1652	* @param pVM The VM Handle.
1653	*/
1654	VMMR3DECL(int) SELMR3DebugCheck(PVM pVM)
1655	{
1656	#ifdef VBOX_STRICT
1657	PVMCPU pVCpu = VMMGetCpu(pVM);
1658
1659	/*
1660	* Get GDTR and check for conflict.
1661	*/
1662	VBOXGDTR GDTR;
1663	CPUMGetGuestGDTR(pVCpu, &GDTR);
1664	if (GDTR.cbGdt == 0)
1665	return VINF_SUCCESS;
1666
1667	if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
1668	Log(("SELMR3DebugCheck: guest GDT size forced us to look for unused selectors.\n"));
1669
1670	if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1671	Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
1672
1673	/*
1674	* Loop thru the GDT checking each entry.
1675	*/
1676	RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
1677	PX86DESC pGDTE = pVM->selm.s.paGdtR3;
1678	PX86DESC pGDTEEnd = (PX86DESC)((uintptr_t)pGDTE + GDTR.cbGdt);
1679	while (pGDTE < pGDTEEnd)
1680	{
1681	X86DESC GDTEGuest;
1682	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
1683	if (RT_SUCCESS(rc))
1684	{
1685	if (pGDTE->Gen.u1DescType \|\| pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1686	{
1687	if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
1688	\|\| pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
1689	\|\| pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
1690	\|\| pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
1691	\|\| pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
1692	\|\| pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
1693	\|\| pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
1694	{
1695	unsigned iGDT = pGDTE - pVM->selm.s.paGdtR3;
1696	SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
1697	SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
1698	}
1699	}
1700	}
1701
1702	/* Advance to the next descriptor. */
1703	GCPtrGDTEGuest += sizeof(X86DESC);
1704	pGDTE++;
1705	}
1706
1707
1708	/*
1709	* LDT?
1710	*/
1711	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1712	if ((SelLdt & X86_SEL_MASK) == 0)
1713	return VINF_SUCCESS;
1714	if (SelLdt > GDTR.cbGdt)
1715	{
1716	Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
1717	return VERR_INTERNAL_ERROR;
1718	}
1719	X86DESC LDTDesc;
1720	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
1721	if (RT_FAILURE(rc))
1722	{
1723	Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
1724	return rc;
1725	}
1726	RTGCPTR GCPtrLDTEGuest = X86DESC_BASE(LDTDesc);
1727	unsigned cbLdt = X86DESC_LIMIT(LDTDesc);
1728	if (LDTDesc.Gen.u1Granularity)
1729	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1730
1731	/*
1732	* Validate it.
1733	*/
1734	if (!cbLdt)
1735	return VINF_SUCCESS;
1736	/** @todo check what intel does about odd limits. */
1737	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1738	if ( LDTDesc.Gen.u1DescType
1739	\|\| LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
1740	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
1741	{
1742	Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
1743	return VERR_INTERNAL_ERROR;
1744	}
1745
1746	/*
1747	* Loop thru the LDT checking each entry.
1748	*/
1749	unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
1750	PX86DESC pLDTE = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1751	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pGDTE + cbLdt);
1752	while (pLDTE < pLDTEEnd)
1753	{
1754	X86DESC LDTEGuest;
1755	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
1756	if (RT_SUCCESS(rc))
1757	{
1758	if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
1759	\|\| pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
1760	\|\| pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
1761	\|\| pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
1762	\|\| pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
1763	\|\| pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
1764	\|\| pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
1765	{
1766	unsigned iLDT = pLDTE - (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1767	SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
1768	SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
1769	}
1770	}
1771
1772	/* Advance to the next descriptor. */
1773	GCPtrLDTEGuest += sizeof(X86DESC);
1774	pLDTE++;
1775	}
1776
1777	#else /* !VBOX_STRICT */
1778	NOREF(pVM);
1779	#endif /* !VBOX_STRICT */
1780
1781	return VINF_SUCCESS;
1782	}
1783
1784
1785	/**
1786	* Validates the RawR0 TSS values against the one in the Guest TSS.
1787	*
1788	* @returns true if it matches.
1789	* @returns false and assertions on mismatch..
1790	* @param pVM VM Handle.
1791	*/
1792	VMMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
1793	{
1794	#ifdef VBOX_STRICT
1795	PVMCPU pVCpu = VMMGetCpu(pVM);
1796
1797	if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1798	return true;
1799
1800	/*
1801	* Get TR and extract the basic info.
1802	*/
1803	CPUMSELREGHID trHid;
1804	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1805	RTGCPTR GCPtrTss = trHid.u64Base;
1806	uint32_t cbTss = trHid.u32Limit;
1807	Assert( (SelTss & X86_SEL_MASK)
1808	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1809	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */));
1810	if (SelTss & X86_SEL_MASK)
1811	{
1812	AssertReturn(!(SelTss & X86_SEL_LDT), false);
1813	AssertReturn(trHid.Attr.n.u1DescType == 0, false);
1814	AssertReturn( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1815	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY,
1816	false);
1817	if (!++cbTss)
1818	cbTss = UINT32_MAX;
1819	}
1820	else
1821	{
1822	AssertReturn( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1823	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY /* RESET */),
1824	false);
1825	cbTss = 0; /* the reset case. */
1826	}
1827	AssertMsgReturn(pVM->selm.s.cbGuestTss == cbTss, ("%#x %#x\n", pVM->selm.s.cbGuestTss, cbTss), false);
1828	AssertMsgReturn(pVM->selm.s.fGuestTss32Bit == ( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1829	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY),
1830	("%RTbool u4Type=%d\n", pVM->selm.s.fGuestTss32Bit, trHid.Attr.n.u4Type),
1831	false);
1832	AssertMsgReturn( pVM->selm.s.GCSelTss == SelTss
1833	\|\| (!pVM->selm.s.GCSelTss && !(SelTss & X86_SEL_LDT)),
1834	("%#x %#x\n", pVM->selm.s.GCSelTss, SelTss),
1835	false);
1836	AssertMsgReturn( pVM->selm.s.GCPtrGuestTss == GCPtrTss
1837	\|\| (pVM->selm.s.GCPtrGuestTss == RTRCPTR_MAX && !GCPtrTss),
1838	("%#RGv %#RGv\n", pVM->selm.s.GCPtrGuestTss, GCPtrTss),
1839	false);
1840
1841
1842	/*
1843	* Figure out the size of what need to monitor.
1844	*/
1845	bool fNoRing1Stack = true;
1846	/* We're not interested in any 16-bit TSSes. */
1847	uint32_t cbMonitoredTss = cbTss;
1848	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1849	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1850	cbMonitoredTss = 0;
1851	if (cbMonitoredTss)
1852	{
1853	VBOXTSS Tss;
1854	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1855	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1856	AssertReturn( rc == VINF_SUCCESS
1857	/* Happends early in XP boot during page table switching. */
1858	\|\| ( (rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT)
1859	&& !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF)),
1860	false);
1861	if ( !(cr4 & X86_CR4_VME)
1862	\|\| ( VBOX_SUCCESS(rc)
1863	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1864	&& Tss.offIoBitmap > cbTss)
1865	)
1866	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1867	else if (RT_SUCCESS(rc))
1868	{
1869	cbMonitoredTss = Tss.offIoBitmap;
1870	AssertMsgReturn(pVM->selm.s.offGuestIoBitmap == Tss.offIoBitmap,
1871	("#x %#x\n", pVM->selm.s.offGuestIoBitmap, Tss.offIoBitmap),
1872	false);
1873
1874	/* check the bitmap */
1875	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1876	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss.IntRedirBitmap,
1877	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1878	AssertRCReturn(rc, false);
1879	AssertMsgReturn(!memcmp(&Tss.IntRedirBitmap[0], &pVM->selm.s.Tss.IntRedirBitmap[0], sizeof(Tss.IntRedirBitmap)),
1880	("offIoBitmap=%#x cbTss=%#x\n"
1881	" Guest: %.32Rhxs\n"
1882	"Shadow: %.32Rhxs\n",
1883	Tss.offIoBitmap, cbTss,
1884	&Tss.IntRedirBitmap[0],
1885	&pVM->selm.s.Tss.IntRedirBitmap[0]),
1886	false);
1887	}
1888	else
1889	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1890
1891	/*
1892	* Check SS0 and ESP0.
1893	*/
1894	if ( !pVM->selm.s.fSyncTSSRing0Stack
1895	&& RT_SUCCESS(rc))
1896	{
1897	if ( Tss.esp0 != pVM->selm.s.Tss.esp1
1898	\|\| Tss.ss0 != (pVM->selm.s.Tss.ss1 & ~1))
1899	{
1900	RTGCPHYS GCPhys;
1901	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1902	AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%RGv Phys=%RGp\n",
1903	(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1,
1904	Tss.ss1, Tss.esp1, GCPtrTss, GCPhys));
1905	return false;
1906	}
1907	}
1908	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1909	}
1910	else
1911	{
1912	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);
1913	AssertReturn(!pVM->selm.s.fSyncTSSRing0Stack, false);
1914	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1915	}
1916
1917
1918
1919	return true;
1920
1921	#else /* !VBOX_STRICT */
1922	NOREF(pVM);
1923	return true;
1924	#endif /* !VBOX_STRICT */
1925	}
1926
1927
1928	/**
1929	* Returns flat address and limit of LDT by LDT selector from guest GDTR.
1930	*
1931	* Fully validate selector.
1932	*
1933	* @returns VBox status.
1934	* @param pVM VM Handle.
1935	* @param SelLdt LDT selector.
1936	* @param ppvLdt Where to store the flat address of LDT.
1937	* @param pcbLimit Where to store LDT limit.
1938	*/
1939	VMMDECL(int) SELMGetLDTFromSel(PVM pVM, RTSEL SelLdt, PRTGCPTR ppvLdt, unsigned *pcbLimit)
1940	{
1941	PVMCPU pVCpu = VMMGetCpu(pVM);
1942
1943	/* Get guest GDTR. */
1944	VBOXGDTR GDTR;
1945	CPUMGetGuestGDTR(pVCpu, &GDTR);
1946
1947	/* Check selector TI and GDT limit. */
1948	if ( SelLdt & X86_SEL_LDT
1949	\|\| (SelLdt > GDTR.cbGdt))
1950	return VERR_INVALID_SELECTOR;
1951
1952	/* Read descriptor from GC. */
1953	X86DESC Desc;
1954	int rc = PGMPhysSimpleReadGCPtr(pVCpu, (void *)&Desc, (RTGCPTR)(GDTR.pGdt + (SelLdt & X86_SEL_MASK)), sizeof(Desc));
1955	if (RT_FAILURE(rc))
1956	{
1957	/* fatal */
1958	AssertMsgFailed(("Can't read LDT descriptor for selector=%04X\n", SelLdt));
1959	return VERR_SELECTOR_NOT_PRESENT;
1960	}
1961
1962	/* Check if LDT descriptor is not present. */
1963	if (Desc.Gen.u1Present == 0)
1964	return VERR_SELECTOR_NOT_PRESENT;
1965
1966	/* Check LDT descriptor type. */
1967	if ( Desc.Gen.u1DescType == 1
1968	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1969	return VERR_INVALID_SELECTOR;
1970
1971	/* LDT descriptor is ok. */
1972	if (ppvLdt)
1973	{
1974	*ppvLdt = (RTGCPTR)X86DESC_BASE(Desc);
1975	*pcbLimit = X86DESC_LIMIT(Desc);
1976	}
1977	return VINF_SUCCESS;
1978	}
1979
1980
1981	/**
1982	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
1983	*
1984	* See SELMR3GetSelectorInfo for details.
1985	*
1986	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
1987	*
1988	* @param pVM VM handle.
1989	* @param pVCpu VMCPU handle.
1990	* @param Sel The selector to get info about.
1991	* @param pSelInfo Where to store the information.
1992	*/
1993	static int selmR3GetSelectorInfo64(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
1994	{
1995	/*
1996	* Read it from the guest descriptor table.
1997	*/
1998	X86DESC64 Desc;
1999	VBOXGDTR Gdtr;
2000	RTGCPTR GCPtrDesc;
2001	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2002	if (!(Sel & X86_SEL_LDT))
2003	{
2004	/* GDT */
2005	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2006	return VERR_INVALID_SELECTOR;
2007	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2008	}
2009	else
2010	{
2011	/*
2012	* LDT - must locate the LDT first.
2013	*/
2014	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2015	if ( (unsigned)(SelLdt & X86_SEL_MASK) < sizeof(X86DESC) /* the first selector is invalid, right? */
2016	\|\| (unsigned)(SelLdt & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2017	return VERR_INVALID_SELECTOR;
2018	GCPtrDesc = Gdtr.pGdt + (SelLdt & X86_SEL_MASK);
2019	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2020	if (RT_FAILURE(rc))
2021	return rc;
2022
2023	/* validate the LDT descriptor. */
2024	if (Desc.Gen.u1Present == 0)
2025	return VERR_SELECTOR_NOT_PRESENT;
2026	if ( Desc.Gen.u1DescType == 1
2027	\|\| Desc.Gen.u4Type != AMD64_SEL_TYPE_SYS_LDT)
2028	return VERR_INVALID_SELECTOR;
2029
2030	uint32_t cbLimit = X86DESC_LIMIT(Desc);
2031	if (Desc.Gen.u1Granularity)
2032	cbLimit = (cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2033	if ((uint32_t)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > cbLimit)
2034	return VERR_INVALID_SELECTOR;
2035
2036	/* calc the descriptor location. */
2037	GCPtrDesc = X86DESC64_BASE(Desc);
2038	GCPtrDesc += (Sel & X86_SEL_MASK);
2039	}
2040
2041	/* read the descriptor. */
2042	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2043	if (RT_FAILURE(rc))
2044	{
2045	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
2046	if (RT_FAILURE(rc))
2047	return rc;
2048	Desc.au64[1] = 0;
2049	}
2050
2051	/*
2052	* Extract the base and limit
2053	* (We ignore the present bit here, which is probably a bit silly...)
2054	*/
2055	pSelInfo->Sel = Sel;
2056	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
2057	pSelInfo->u.Raw64 = Desc;
2058	if (Desc.Gen.u1DescType)
2059	{
2060	/*
2061	* 64-bit code selectors are wide open, it's not possible to detect
2062	* 64-bit data or stack selectors without also dragging in assumptions
2063	* about current CS (i.e. that's we're executing in 64-bit mode). So,
2064	* the selinfo user needs to deal with this in the context the info is
2065	* used unfortunately.
2066	*/
2067	if ( Desc.Gen.u1Long
2068	&& !Desc.Gen.u1DefBig
2069	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
2070	{
2071	/* Note! We ignore the segment limit hacks that was added by AMD. */
2072	pSelInfo->GCPtrBase = 0;
2073	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
2074	}
2075	else
2076	{
2077	pSelInfo->cbLimit = X86DESC_LIMIT(Desc);
2078	if (Desc.Gen.u1Granularity)
2079	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2080	pSelInfo->GCPtrBase = X86DESC_BASE(Desc);
2081	}
2082	pSelInfo->SelGate = 0;
2083	}
2084	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
2085	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
2086	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
2087	{
2088	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
2089	in the AMD manual here as a simplification. */
2090	pSelInfo->GCPtrBase = X86DESC64_BASE(Desc);
2091	pSelInfo->cbLimit = X86DESC_LIMIT(Desc);
2092	if (Desc.Gen.u1Granularity)
2093	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2094	pSelInfo->SelGate = 0;
2095	}
2096	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
2097	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
2098	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
2099	{
2100	pSelInfo->cbLimit = X86DESC64_BASE(Desc);
2101	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
2102	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
2103	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
2104	pSelInfo->SelGate = Desc.Gate.u16Sel;
2105	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2106	}
2107	else
2108	{
2109	pSelInfo->cbLimit = 0;
2110	pSelInfo->GCPtrBase = 0;
2111	pSelInfo->SelGate = 0;
2112	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2113	}
2114	if (!Desc.Gen.u1Present)
2115	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2116
2117	return VINF_SUCCESS;
2118	}
2119
2120
2121	/**
2122	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
2123	* interprets a legacy descriptor table entry and fills in the selector info
2124	* structure from it.
2125	*
2126	* @param pSelInfo Where to store the selector info. Only the fFlags and
2127	* Sel members have been initialized.
2128	* @param pDesc The legacy descriptor to parse.
2129	*/
2130	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
2131	{
2132	pSelInfo->u.Raw64.au64[1] = 0;
2133	pSelInfo->u.Raw = *pDesc;
2134	if ( pDesc->Gen.u1DescType
2135	\|\| !(pDesc->Gen.u4Type & 4))
2136	{
2137	pSelInfo->cbLimit = X86DESC_LIMIT(*pDesc);
2138	if (pDesc->Gen.u1Granularity)
2139	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2140	pSelInfo->GCPtrBase = X86DESC_BASE(*pDesc);
2141	pSelInfo->SelGate = 0;
2142	}
2143	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
2144	{
2145	pSelInfo->cbLimit = 0;
2146	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
2147	pSelInfo->GCPtrBase = 0;
2148	else
2149	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
2150	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
2151	pSelInfo->SelGate = pDesc->Gate.u16Sel;
2152	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2153	}
2154	else
2155	{
2156	pSelInfo->cbLimit = 0;
2157	pSelInfo->GCPtrBase = 0;
2158	pSelInfo->SelGate = 0;
2159	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2160	}
2161	if (!pDesc->Gen.u1Present)
2162	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2163	}
2164
2165
2166	/**
2167	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2168	*
2169	* See SELMR3GetSelectorInfo for details.
2170	*
2171	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2172	*
2173	* @param pVM VM handle.
2174	* @param pVCpu VMCPU handle.
2175	* @param Sel The selector to get info about.
2176	* @param pSelInfo Where to store the information.
2177	*/
2178	static int selmR3GetSelectorInfo32(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2179	{
2180	/*
2181	* Read the descriptor entry
2182	*/
2183	pSelInfo->fFlags = 0;
2184	X86DESC Desc;
2185	if ( !(Sel & X86_SEL_LDT)
2186	&& ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK)
2187	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK)
2188	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK)
2189	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK)
2190	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK))
2191	)
2192	{
2193	/*
2194	* Hypervisor descriptor.
2195	*/
2196	pSelInfo->fFlags = DBGFSELINFO_FLAGS_HYPER;
2197	if (CPUMIsGuestInProtectedMode(pVCpu))
2198	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2199	else
2200	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2201
2202	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2203	}
2204	else if (CPUMIsGuestInProtectedMode(pVCpu))
2205	{
2206	/*
2207	* Read it from the guest descriptor table.
2208	*/
2209	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
2210
2211	VBOXGDTR Gdtr;
2212	RTGCPTR GCPtrDesc;
2213	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2214	if (!(Sel & X86_SEL_LDT))
2215	{
2216	/* GDT */
2217	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2218	return VERR_INVALID_SELECTOR;
2219	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2220	}
2221	else
2222	{
2223	/*
2224	* LDT - must locate the LDT first...
2225	*/
2226	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2227	if ( (unsigned)(SelLdt & X86_SEL_MASK) < sizeof(X86DESC) /* the first selector is invalid, right? */
2228	\|\| (unsigned)(SelLdt & X86_SEL_MASK) + sizeof(X86DESC) - 1 > (unsigned)Gdtr.cbGdt)
2229	return VERR_INVALID_SELECTOR;
2230	GCPtrDesc = Gdtr.pGdt + (SelLdt & X86_SEL_MASK);
2231	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2232	if (RT_FAILURE(rc))
2233	return rc;
2234
2235	/* validate the LDT descriptor. */
2236	if (Desc.Gen.u1Present == 0)
2237	return VERR_SELECTOR_NOT_PRESENT;
2238	if ( Desc.Gen.u1DescType == 1
2239	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
2240	return VERR_INVALID_SELECTOR;
2241
2242	unsigned cbLimit = X86DESC_LIMIT(Desc);
2243	if (Desc.Gen.u1Granularity)
2244	cbLimit = (cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
2245	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(X86DESC) - 1 > cbLimit)
2246	return VERR_INVALID_SELECTOR;
2247
2248	/* calc the descriptor location. */
2249	GCPtrDesc = X86DESC_BASE(Desc);
2250	GCPtrDesc += (Sel & X86_SEL_MASK);
2251	}
2252
2253	/* read the descriptor. */
2254	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2255	if (RT_FAILURE(rc))
2256	return rc;
2257	}
2258	else
2259	{
2260	/*
2261	* We're in real mode.
2262	*/
2263	pSelInfo->Sel = Sel;
2264	pSelInfo->GCPtrBase = Sel << 4;
2265	pSelInfo->cbLimit = 0xffff;
2266	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
2267	pSelInfo->u.Raw64.au64[0] = 0;
2268	pSelInfo->u.Raw64.au64[1] = 0;
2269	pSelInfo->SelGate = 0;
2270	return VINF_SUCCESS;
2271	}
2272
2273	/*
2274	* Extract the base and limit or sel:offset for gates.
2275	*/
2276	pSelInfo->Sel = Sel;
2277	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2278
2279	return VINF_SUCCESS;
2280	}
2281
2282
2283	/**
2284	* Gets information about a selector.
2285	*
2286	* Intended for the debugger mostly and will prefer the guest descriptor tables
2287	* over the shadow ones.
2288	*
2289	* @retval VINF_SUCCESS on success.
2290	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2291	* descriptor table.
2292	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2293	* is not returned if the selector itself isn't present, you have to
2294	* check that for yourself (see DBGFSELINFO::fFlags).
2295	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2296	* pagetable or page backing the selector table wasn't present.
2297	* @returns Other VBox status code on other errors.
2298	*
2299	* @param pVM VM handle.
2300	* @param pVCpu The virtual CPU handle.
2301	* @param Sel The selector to get info about.
2302	* @param pSelInfo Where to store the information.
2303	*/
2304	VMMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2305	{
2306	AssertPtr(pSelInfo);
2307	if (CPUMIsGuestInLongMode(pVCpu))
2308	return selmR3GetSelectorInfo64(pVM, pVCpu, Sel, pSelInfo);
2309	return selmR3GetSelectorInfo32(pVM, pVCpu, Sel, pSelInfo);
2310	}
2311
2312
2313	/**
2314	* Gets information about a selector from the shadow tables.
2315	*
2316	* This is intended to be faster than the SELMR3GetSelectorInfo() method, but
2317	* requires that the caller ensures that the shadow tables are up to date.
2318	*
2319	* @retval VINF_SUCCESS on success.
2320	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2321	* descriptor table.
2322	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2323	* is not returned if the selector itself isn't present, you have to
2324	* check that for yourself (see DBGFSELINFO::fFlags).
2325	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2326	* pagetable or page backing the selector table wasn't present.
2327	* @returns Other VBox status code on other errors.
2328	*
2329	* @param pVM VM handle.
2330	* @param Sel The selector to get info about.
2331	* @param pSelInfo Where to store the information.
2332	*
2333	* @remarks Don't use this when in hardware assisted virtualization mode.
2334	*/
2335	VMMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PDBGFSELINFO pSelInfo)
2336	{
2337	Assert(pSelInfo);
2338
2339	/*
2340	* Read the descriptor entry
2341	*/
2342	X86DESC Desc;
2343	if (!(Sel & X86_SEL_LDT))
2344	{
2345	/*
2346	* Global descriptor.
2347	*/
2348	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2349	pSelInfo->fFlags = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK)
2350	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK)
2351	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK)
2352	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK)
2353	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK)
2354	? DBGFSELINFO_FLAGS_HYPER
2355	: 0;
2356	/** @todo check that the GDT offset is valid. */
2357	}
2358	else
2359	{
2360	/*
2361	* Local Descriptor.
2362	*/
2363	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2364	Desc = paLDT[Sel >> X86_SEL_SHIFT];
2365	/** @todo check if the LDT page is actually available. */
2366	/** @todo check that the LDT offset is valid. */
2367	pSelInfo->fFlags = 0;
2368	}
2369	if (CPUMIsGuestInProtectedMode(VMMGetCpu0(pVM)))
2370	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2371	else
2372	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2373
2374	/*
2375	* Extract the base and limit or sel:offset for gates.
2376	*/
2377	pSelInfo->Sel = Sel;
2378	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2379
2380	return VINF_SUCCESS;
2381	}
2382
2383
2384	/**
2385	* Formats a descriptor.
2386	*
2387	* @param Desc Descriptor to format.
2388	* @param Sel Selector number.
2389	* @param pszOutput Output buffer.
2390	* @param cchOutput Size of output buffer.
2391	*/
2392	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
2393	{
2394	/*
2395	* Make variable description string.
2396	*/
2397	static struct
2398	{
2399	unsigned cch;
2400	const char *psz;
2401	} const aTypes[32] =
2402	{
2403	#define STRENTRY(str) { sizeof(str) - 1, str }
2404	/* system */
2405	STRENTRY("Reserved0 "), /* 0x00 */
2406	STRENTRY("TSS16Avail "), /* 0x01 */
2407	STRENTRY("LDT "), /* 0x02 */
2408	STRENTRY("TSS16Busy "), /* 0x03 */
2409	STRENTRY("Call16 "), /* 0x04 */
2410	STRENTRY("Task "), /* 0x05 */
2411	STRENTRY("Int16 "), /* 0x06 */
2412	STRENTRY("Trap16 "), /* 0x07 */
2413	STRENTRY("Reserved8 "), /* 0x08 */
2414	STRENTRY("TSS32Avail "), /* 0x09 */
2415	STRENTRY("ReservedA "), /* 0x0a */
2416	STRENTRY("TSS32Busy "), /* 0x0b */
2417	STRENTRY("Call32 "), /* 0x0c */
2418	STRENTRY("ReservedD "), /* 0x0d */
2419	STRENTRY("Int32 "), /* 0x0e */
2420	STRENTRY("Trap32 "), /* 0x0f */
2421	/* non system */
2422	STRENTRY("DataRO "), /* 0x10 */
2423	STRENTRY("DataRO Accessed "), /* 0x11 */
2424	STRENTRY("DataRW "), /* 0x12 */
2425	STRENTRY("DataRW Accessed "), /* 0x13 */
2426	STRENTRY("DataDownRO "), /* 0x14 */
2427	STRENTRY("DataDownRO Accessed "), /* 0x15 */
2428	STRENTRY("DataDownRW "), /* 0x16 */
2429	STRENTRY("DataDownRW Accessed "), /* 0x17 */
2430	STRENTRY("CodeEO "), /* 0x18 */
2431	STRENTRY("CodeEO Accessed "), /* 0x19 */
2432	STRENTRY("CodeER "), /* 0x1a */
2433	STRENTRY("CodeER Accessed "), /* 0x1b */
2434	STRENTRY("CodeConfEO "), /* 0x1c */
2435	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
2436	STRENTRY("CodeConfER "), /* 0x1e */
2437	STRENTRY("CodeConfER Accessed ") /* 0x1f */
2438	#undef SYSENTRY
2439	};
2440	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
2441	char szMsg[128];
2442	char *psz = &szMsg[0];
2443	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
2444	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
2445	psz += aTypes[i].cch;
2446
2447	if (Desc.Gen.u1Present)
2448	ADD_STR(psz, "Present ");
2449	else
2450	ADD_STR(psz, "Not-Present ");
2451	if (Desc.Gen.u1Granularity)
2452	ADD_STR(psz, "Page ");
2453	if (Desc.Gen.u1DefBig)
2454	ADD_STR(psz, "32-bit ");
2455	else
2456	ADD_STR(psz, "16-bit ");
2457	#undef ADD_STR
2458	*psz = '\0';
2459
2460	/*
2461	* Limit and Base and format the output.
2462	*/
2463	uint32_t u32Limit = X86DESC_LIMIT(Desc);
2464	if (Desc.Gen.u1Granularity)
2465	u32Limit = u32Limit << PAGE_SHIFT \| PAGE_OFFSET_MASK;
2466	uint32_t u32Base = X86DESC_BASE(Desc);
2467
2468	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
2469	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
2470	}
2471
2472
2473	/**
2474	* Dumps a descriptor.
2475	*
2476	* @param Desc Descriptor to dump.
2477	* @param Sel Selector number.
2478	* @param pszMsg Message to prepend the log entry with.
2479	*/
2480	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
2481	{
2482	char szOutput[128];
2483	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
2484	Log(("%s: %s\n", pszMsg, szOutput));
2485	NOREF(szOutput[0]);
2486	}
2487
2488
2489	/**
2490	* Display the shadow gdt.
2491	*
2492	* @param pVM VM Handle.
2493	* @param pHlp The info helpers.
2494	* @param pszArgs Arguments, ignored.
2495	*/
2496	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2497	{
2498	pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%RRv):\n", MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3));
2499	for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
2500	{
2501	if (pVM->selm.s.paGdtR3[iGDT].Gen.u1Present)
2502	{
2503	char szOutput[128];
2504	selmR3FormatDescriptor(pVM->selm.s.paGdtR3[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2505	const char *psz = "";
2506	if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> X86_SEL_SHIFT))
2507	psz = " HyperCS";
2508	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> X86_SEL_SHIFT))
2509	psz = " HyperDS";
2510	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> X86_SEL_SHIFT))
2511	psz = " HyperCS64";
2512	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> X86_SEL_SHIFT))
2513	psz = " HyperTSS";
2514	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
2515	psz = " HyperTSSTrap08";
2516	pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
2517	}
2518	}
2519	}
2520
2521
2522	/**
2523	* Display the guest gdt.
2524	*
2525	* @param pVM VM Handle.
2526	* @param pHlp The info helpers.
2527	* @param pszArgs Arguments, ignored.
2528	*/
2529	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2530	{
2531	/** @todo SMP support! */
2532	PVMCPU pVCpu = &pVM->aCpus[0];
2533
2534	VBOXGDTR GDTR;
2535	CPUMGetGuestGDTR(pVCpu, &GDTR);
2536	RTGCPTR GCPtrGDT = GDTR.pGdt;
2537	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
2538
2539	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
2540	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
2541	{
2542	X86DESC GDTE;
2543	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
2544	if (RT_SUCCESS(rc))
2545	{
2546	if (GDTE.Gen.u1Present)
2547	{
2548	char szOutput[128];
2549	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2550	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2551	}
2552	}
2553	else if (rc == VERR_PAGE_NOT_PRESENT)
2554	{
2555	if ((GCPtrGDT & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2556	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
2557	}
2558	else
2559	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
2560	}
2561	}
2562
2563
2564	/**
2565	* Display the shadow ldt.
2566	*
2567	* @param pVM VM Handle.
2568	* @param pHlp The info helpers.
2569	* @param pszArgs Arguments, ignored.
2570	*/
2571	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2572	{
2573	unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
2574	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2575	pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%RRv limit=%#x):\n", pVM->selm.s.pvLdtRC + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
2576	for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
2577	{
2578	if (paLDT[iLDT].Gen.u1Present)
2579	{
2580	char szOutput[128];
2581	selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2582	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2583	}
2584	}
2585	}
2586
2587
2588	/**
2589	* Display the guest ldt.
2590	*
2591	* @param pVM VM Handle.
2592	* @param pHlp The info helpers.
2593	* @param pszArgs Arguments, ignored.
2594	*/
2595	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2596	{
2597	/** @todo SMP support! */
2598	PVMCPU pVCpu = &pVM->aCpus[0];
2599
2600	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
2601	if (!(SelLdt & X86_SEL_MASK))
2602	{
2603	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
2604	return;
2605	}
2606
2607	RTGCPTR GCPtrLdt;
2608	unsigned cbLdt;
2609	int rc = SELMGetLDTFromSel(pVM, SelLdt, &GCPtrLdt, &cbLdt);
2610	if (RT_FAILURE(rc))
2611	{
2612	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): rc=%Rrc\n", SelLdt, rc);
2613	return;
2614	}
2615
2616	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RGv limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
2617	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
2618	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
2619	{
2620	X86DESC LdtE;
2621	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
2622	if (RT_SUCCESS(rc))
2623	{
2624	if (LdtE.Gen.u1Present)
2625	{
2626	char szOutput[128];
2627	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2628	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2629	}
2630	}
2631	else if (rc == VERR_PAGE_NOT_PRESENT)
2632	{
2633	if ((GCPtrLdt & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2634	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
2635	}
2636	else
2637	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
2638	}
2639	}
2640
2641
2642	/**
2643	* Dumps the hypervisor GDT
2644	*
2645	* @param pVM VM handle.
2646	*/
2647	VMMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
2648	{
2649	DBGFR3Info(pVM, "gdt", NULL, NULL);
2650	}
2651
2652
2653	/**
2654	* Dumps the hypervisor LDT
2655	*
2656	* @param pVM VM handle.
2657	*/
2658	VMMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
2659	{
2660	DBGFR3Info(pVM, "ldt", NULL, NULL);
2661	}
2662
2663
2664	/**
2665	* Dumps the guest GDT
2666	*
2667	* @param pVM VM handle.
2668	*/
2669	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
2670	{
2671	DBGFR3Info(pVM, "gdtguest", NULL, NULL);
2672	}
2673
2674
2675	/**
2676	* Dumps the guest LDT
2677	*
2678	* @param pVM VM handle.
2679	*/
2680	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
2681	{
2682	DBGFR3Info(pVM, "ldtguest", NULL, NULL);
2683	}
2684

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source: vbox/trunk/src/VBox/VMM/SELM.cpp@ 22493

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