SELM.cpp@ 1313

Last change on this file since 1313 was 944, checked in by vboxsync, 18 years ago
Sync on completed load the shadow structures might be used before we execute raw mode (debug stuff at least doest).
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File size: 82.9 KB

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1	/* $Id: SELM.cpp 944 2007-02-15 22:00:53Z vboxsync $ */
2	/** @file
3	* SELM - The Selector manager.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_SELM
26	#include <VBox/selm.h>
27	#include <VBox/cpum.h>
28	#include <VBox/stam.h>
29	#include <VBox/mm.h>
30	#include <VBox/pdm.h>
31	#include <VBox/pgm.h>
32	#include <VBox/trpm.h>
33	#include <VBox/dbgf.h>
34	#include "SELMInternal.h"
35	#include <VBox/vm.h>
36	#include <VBox/err.h>
37	#include <VBox/param.h>
38
39	#include <iprt/assert.h>
40	#include <VBox/log.h>
41	#include <iprt/asm.h>
42	#include <iprt/string.h>
43	#include <iprt/thread.h>
44	#include <iprt/string.h>
45	#include "x86context.h"
46
47
48	/**
49	* Enable or disable tracking of Guest's GDT/LDT/TSS.
50	* @{
51	*/
52	#define SELM_TRACK_GUEST_GDT_CHANGES
53	#define SELM_TRACK_GUEST_LDT_CHANGES
54	#define SELM_TRACK_GUEST_TSS_CHANGES
55	/** @} */
56
57	/**
58	* Enable or disable tracking of Shadow GDT/LDT/TSS.
59	* @{
60	*/
61	#define SELM_TRACK_SHADOW_GDT_CHANGES
62	#define SELM_TRACK_SHADOW_LDT_CHANGES
63	#define SELM_TRACK_SHADOW_TSS_CHANGES
64	/** @} */
65
66
67	/** SELM saved state version. */
68	#define SELM_SAVED_STATE_VERSION 5
69
70	/*******************************************************************************
71	* Internal Functions *
72	*******************************************************************************/
73	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
74	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
75	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
76	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
77	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
78	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
79	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
80	//static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
81	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
82	static DECLCALLBACK(int) selmGuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
83	static DECLCALLBACK(int) selmGuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
84	static DECLCALLBACK(int) selmGuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPhys, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
85
86
87
88	/**
89	* Initializes the SELM.
90	*
91	* @returns VBox status code.
92	* @param pVM The VM to operate on.
93	*/
94	SELMR3DECL(int) SELMR3Init(PVM pVM)
95	{
96	LogFlow(("SELMR3Init\n"));
97
98	/*
99	* Assert alignment and sizes.
100	*/
101	AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
102	AssertRelease(!(RT_OFFSETOF(VM, selm.s.Tss) & 15));
103	AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
104
105	/*
106	* Init the structure.
107	*/
108	pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
109	pVM->selm.s.SelCS = (SELM_GDT_ELEMENTS - 0x1) << 3;
110	pVM->selm.s.SelDS = (SELM_GDT_ELEMENTS - 0x2) << 3;
111	pVM->selm.s.SelCS64 = (SELM_GDT_ELEMENTS - 0x3) << 3;
112	pVM->selm.s.SelTSS = (SELM_GDT_ELEMENTS - 0x4) << 3;
113	pVM->selm.s.SelTSSTrap08 = (SELM_GDT_ELEMENTS - 0x5) << 3;
114
115	/*
116	* Allocate GDT table.
117	*/
118	int rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtHC[0]) * SELM_GDT_ELEMENTS,
119	PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtHC);
120	AssertRCReturn(rc, rc);
121
122	/*
123	* Allocate LDT area.
124	*/
125	rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.HCPtrLdt);
126	AssertRCReturn(rc, rc);
127
128	/*
129	* Init Guest's and Shadow GDT, LDT, TSS changes control variables.
130	*/
131	pVM->selm.s.cbEffGuestGdtLimit = 0;
132	pVM->selm.s.GuestGdtr.pGdt = ~0;
133	pVM->selm.s.GCPtrGuestLdt = ~0;
134	pVM->selm.s.GCPtrGuestTss = ~0;
135
136	pVM->selm.s.paGdtGC = 0;
137	pVM->selm.s.GCPtrLdt = ~0;
138	pVM->selm.s.GCPtrTss = ~0;
139	pVM->selm.s.GCSelTss = ~0;
140
141	pVM->selm.s.fDisableMonitoring = false;
142	pVM->selm.s.fSyncTSSRing0Stack = false;
143
144	/*
145	* Register the saved state data unit.
146	*/
147	rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
148	NULL, selmR3Save, NULL,
149	NULL, selmR3Load, selmR3LoadDone);
150	if (VBOX_FAILURE(rc))
151	return rc;
152
153	/*
154	* Statistics.
155	*/
156	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestGDTHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest GDT.");
157	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestGDTUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest GDT.");
158	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestLDT, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/LDT", STAMUNIT_OCCURENCES, "The number of writes to the Guest LDT was detected.");
159	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestTSSHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS.");
160	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestTSSHandledChanged,STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSIntChg", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS where the R0 stack changed.");
161	STAM_REG(pVM, &pVM->selm.s.StatGCWriteGuestTSSUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest TSS.");
162	STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
163	STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
164
165	/*
166	* Default action when entering raw mode for the first time
167	*/
168	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
169	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
170	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
171
172	/*
173	* Register info handlers.
174	*/
175	DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
176	DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
177	DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
178	DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
179	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
180	//DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
181
182	return rc;
183	}
184
185
186	/**
187	* Finalizes HMA page attributes.
188	*
189	* @returns VBox status code.
190	* @param pVM The VM handle.
191	*/
192	SELMR3DECL(int) SELMR3InitFinalize(PVM pVM)
193	{
194	/*
195	* Make Double Fault work with WP enabled?
196	*
197	* The double fault is a task switch and thus requires write access to the GDT of the TSS
198	* (to set it busy), to the old TSS (to store state), and to the Trap 8 TSS for the back link.
199	*
200	* Since we in enabling write access to these pages make ourself vulnerable to attacks,
201	* it is not possible to do this by default.
202	*/
203	bool f;
204	int rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "DoubleFault", &f);
205	#if !defined(DEBUG_bird) && !defined(__AMD64__) /** @todo Remember to remove __AMD64__ here! */
206	if (VBOX_SUCCESS(rc) && f)
207	#endif
208	{
209	PVBOXDESC paGdt = pVM->selm.s.paGdtHC;
210	rc = PGMMapSetPage(pVM, MMHyperHC2GC(pVM, &paGdt[pVM->selm.s.SelTSSTrap08 >> 3]), sizeof(paGdt[0]),
211	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
212	AssertRC(rc);
213	rc = PGMMapSetPage(pVM, MMHyperHC2GC(pVM, &paGdt[pVM->selm.s.SelTSS >> 3]), sizeof(paGdt[0]),
214	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
215	AssertRC(rc);
216	rc = PGMMapSetPage(pVM, VM_GUEST_ADDR(pVM, &pVM->selm.s.Tss), sizeof(pVM->selm.s.Tss),
217	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
218	AssertRC(rc);
219	rc = PGMMapSetPage(pVM, VM_GUEST_ADDR(pVM, &pVM->selm.s.TssTrap08), sizeof(pVM->selm.s.TssTrap08),
220	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
221	AssertRC(rc);
222	}
223	return VINF_SUCCESS;
224	}
225
226
227	/**
228	* Applies relocations to data and code managed by this
229	* component. This function will be called at init and
230	* whenever the VMM need to relocate it self inside the GC.
231	*
232	* @param pVM The VM.
233	*/
234	SELMR3DECL(void) SELMR3Relocate(PVM pVM)
235	{
236	LogFlow(("SELMR3Relocate\n"));
237	PVBOXDESC paGdt = pVM->selm.s.paGdtHC;
238
239	/*
240	* Update GDTR and selector.
241	*/
242	CPUMSetHyperGDTR(pVM, MMHyperHC2GC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
243
244	/** @todo selector relocations should be a seperate operation? */
245	CPUMSetHyperCS(pVM, pVM->selm.s.SelCS);
246	CPUMSetHyperDS(pVM, pVM->selm.s.SelDS);
247	CPUMSetHyperES(pVM, pVM->selm.s.SelDS);
248	CPUMSetHyperSS(pVM, pVM->selm.s.SelDS);
249	CPUMSetHyperTR(pVM, pVM->selm.s.SelTSS);
250
251	/*
252	* Set up global code and data descriptors for use in the guest context.
253	* Both are wide open (base 0, limit 4GB)
254	*/
255	PVBOXDESC pDesc = &paGdt[pVM->selm.s.SelCS >> 3];
256	pDesc->Gen.u16LimitLow = 0xffff;
257	pDesc->Gen.u4LimitHigh = 0xf;
258	pDesc->Gen.u16BaseLow = 0;
259	pDesc->Gen.u8BaseHigh1 = 0;
260	pDesc->Gen.u8BaseHigh2 = 0;
261	pDesc->Gen.u4Type = X86_SELTYPE_MEM_EXECUTEREAD_ACC;
262	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
263	pDesc->Gen.u2Dpl = 0; /* supervisor */
264	pDesc->Gen.u1Present = 1;
265	pDesc->Gen.u1Available = 0;
266	pDesc->Gen.u1Reserved = 0;
267	pDesc->Gen.u1DefBig = 1; /* def 32 bit */
268	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
269
270	/* data */
271	pDesc = &paGdt[pVM->selm.s.SelDS >> 3];
272	pDesc->Gen.u16LimitLow = 0xffff;
273	pDesc->Gen.u4LimitHigh = 0xf;
274	pDesc->Gen.u16BaseLow = 0;
275	pDesc->Gen.u8BaseHigh1 = 0;
276	pDesc->Gen.u8BaseHigh2 = 0;
277	pDesc->Gen.u4Type = X86_SELTYPE_MEM_READWRITE_ACC;
278	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
279	pDesc->Gen.u2Dpl = 0; /* supervisor */
280	pDesc->Gen.u1Present = 1;
281	pDesc->Gen.u1Available = 0;
282	pDesc->Gen.u1Reserved = 0;
283	pDesc->Gen.u1DefBig = 1; /* big */
284	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
285
286	/* 64-bit mode code (& data?) */
287	pDesc = &paGdt[pVM->selm.s.SelCS64 >> 3];
288	pDesc->Gen.u16LimitLow = 0xffff;
289	pDesc->Gen.u4LimitHigh = 0xf;
290	pDesc->Gen.u16BaseLow = 0;
291	pDesc->Gen.u8BaseHigh1 = 0;
292	pDesc->Gen.u8BaseHigh2 = 0;
293	pDesc->Gen.u4Type = X86_SELTYPE_MEM_EXECUTEREAD_ACC;
294	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
295	pDesc->Gen.u2Dpl = 0; /* supervisor */
296	pDesc->Gen.u1Present = 1;
297	pDesc->Gen.u1Available = 0;
298	pDesc->Gen.u1Reserved = 1; /* The Long (L) attribute bit. */
299	pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
300	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
301
302	/*
303	* TSS descriptor
304	*/
305	pDesc = &paGdt[pVM->selm.s.SelTSS >> 3];
306	RTGCPTR pGCTSS = VM_GUEST_ADDR(pVM, &pVM->selm.s.Tss);
307	pDesc->Gen.u16BaseLow = RT_LOWORD(pGCTSS);
308	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(pGCTSS);
309	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(pGCTSS);
310	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
311	pDesc->Gen.u4LimitHigh = 0;
312	pDesc->Gen.u4Type = X86_SELTYPE_SYS_386_TSS_AVAIL;
313	pDesc->Gen.u1DescType = 0; /* system */
314	pDesc->Gen.u2Dpl = 0; /* supervisor */
315	pDesc->Gen.u1Present = 1;
316	pDesc->Gen.u1Available = 0;
317	pDesc->Gen.u1Reserved = 0;
318	pDesc->Gen.u1DefBig = 0;
319	pDesc->Gen.u1Granularity = 0; /* byte limit */
320
321	/*
322	* TSS descriptor for trap 08
323	*/
324	pDesc = &paGdt[pVM->selm.s.SelTSSTrap08 >> 3];
325	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
326	pDesc->Gen.u4LimitHigh = 0;
327	pGCTSS = VM_GUEST_ADDR(pVM, &pVM->selm.s.TssTrap08);
328	pDesc->Gen.u16BaseLow = RT_LOWORD(pGCTSS);
329	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(pGCTSS);
330	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(pGCTSS);
331	pDesc->Gen.u4Type = X86_SELTYPE_SYS_386_TSS_AVAIL;
332	pDesc->Gen.u1DescType = 0; /* system */
333	pDesc->Gen.u2Dpl = 0; /* supervisor */
334	pDesc->Gen.u1Present = 1;
335	pDesc->Gen.u1Available = 0;
336	pDesc->Gen.u1Reserved = 0;
337	pDesc->Gen.u1DefBig = 0;
338	pDesc->Gen.u1Granularity = 0; /* byte limit */
339
340	/** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
341	/** @todo PGM knows the proper CR3 values these days, not CPUM. */
342	/*
343	* Update the TSSes.
344	*/
345	/* Current TSS */
346	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVM);
347	pVM->selm.s.Tss.ss0 = pVM->selm.s.SelDS;
348	pVM->selm.s.Tss.esp0 = VMMGetStackGC(pVM);
349	pVM->selm.s.Tss.cs = pVM->selm.s.SelCS;
350	pVM->selm.s.Tss.ds = pVM->selm.s.SelDS;
351	pVM->selm.s.Tss.es = pVM->selm.s.SelDS;
352	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
353
354	/* trap 08 */
355	pVM->selm.s.TssTrap08.cr3 = PGMGetInterGCCR3(pVM); /* this should give use better survival chances. */
356	pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.SelDS;
357	pVM->selm.s.TssTrap08.ss = pVM->selm.s.SelDS;
358	pVM->selm.s.TssTrap08.esp0 = VMMGetStackGC(pVM) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
359	pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
360	pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
361	pVM->selm.s.TssTrap08.cs = pVM->selm.s.SelCS;
362	pVM->selm.s.TssTrap08.ds = pVM->selm.s.SelDS;
363	pVM->selm.s.TssTrap08.es = pVM->selm.s.SelDS;
364	pVM->selm.s.TssTrap08.fs = 0;
365	pVM->selm.s.TssTrap08.gs = 0;
366	pVM->selm.s.TssTrap08.selLdt = 0;
367	pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
368	pVM->selm.s.TssTrap08.ecx = VM_GUEST_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
369	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
370	pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
371	pVM->selm.s.TssTrap08.edx = VM_GUEST_ADDR(pVM, pVM); /* setup edx VM address. */
372	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
373	pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
374	pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
375	/* TRPM will be updating the eip */
376
377	if (!pVM->selm.s.fDisableMonitoring)
378	{
379	/*
380	* Update shadow GDT/LDT/TSS write access handlers.
381	*/
382	int rc;
383	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
384	if (pVM->selm.s.paGdtGC != 0)
385	{
386	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtGC);
387	AssertRC(rc);
388	}
389	pVM->selm.s.paGdtGC = MMHyperHC2GC(pVM, paGdt);
390	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.paGdtGC,
391	pVM->selm.s.paGdtGC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
392	0, 0, "selmgcShadowGDTWriteHandler", 0, "Shadow GDT write access handler");
393	AssertRC(rc);
394	#endif
395	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
396	if (pVM->selm.s.GCPtrTss != ~0U)
397	{
398	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrTss);
399	AssertRC(rc);
400	}
401	pVM->selm.s.GCPtrTss = VM_GUEST_ADDR(pVM, &pVM->selm.s.Tss);
402	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.GCPtrTss,
403	pVM->selm.s.GCPtrTss + sizeof(pVM->selm.s.Tss) - 1,
404	0, 0, "selmgcShadowTSSWriteHandler", 0, "Shadow TSS write access handler");
405	AssertRC(rc);
406	#endif
407
408	/*
409	* Update the GC LDT region handler and address.
410	*/
411	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
412	if (pVM->selm.s.GCPtrLdt != ~0U)
413	{
414	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrLdt);
415	AssertRC(rc);
416	}
417	#endif
418	pVM->selm.s.GCPtrLdt = MMHyperHC2GC(pVM, pVM->selm.s.HCPtrLdt);
419	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
420	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.GCPtrLdt,
421	pVM->selm.s.GCPtrLdt + _64K + PAGE_SIZE - 1,
422	0, 0, "selmgcShadowLDTWriteHandler", 0, "Shadow LDT write access handler");
423	AssertRC(rc);
424	#endif
425	}
426	}
427
428
429	/**
430	* Notification callback which is called whenever there is a chance that a CR3
431	* value might have changed.
432	* This is called by PGM.
433	*
434	* @param pVM The VM handle
435	*/
436	SELMR3DECL(void) SELMR3PagingModeChanged(PVM pVM)
437	{
438	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVM);
439	pVM->selm.s.TssTrap08.cr3 = PGMGetInterGCCR3(pVM);
440	}
441
442
443	/**
444	* Terminates the SELM.
445	*
446	* Termination means cleaning up and freeing all resources,
447	* the VM it self is at this point powered off or suspended.
448	*
449	* @returns VBox status code.
450	* @param pVM The VM to operate on.
451	*/
452	SELMR3DECL(int) SELMR3Term(PVM pVM)
453	{
454	return 0;
455	}
456
457
458	/**
459	* The VM is being reset.
460	*
461	* For the SELM component this means that any GDT/LDT/TSS monitors
462	* needs to be removed.
463	*
464	* @param pVM VM handle.
465	*/
466	SELMR3DECL(void) SELMR3Reset(PVM pVM)
467	{
468	LogFlow(("SELMR3Reset:\n"));
469	VM_ASSERT_EMT(pVM);
470
471	/*
472	* Uninstall guest GDT/LDT/TSS write access handlers.
473	*/
474	int rc;
475	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
476	if (pVM->selm.s.GuestGdtr.pGdt != ~0U && pVM->selm.s.fGDTRangeRegistered)
477	{
478	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
479	AssertRC(rc);
480	pVM->selm.s.GuestGdtr.pGdt = ~0U;
481	pVM->selm.s.GuestGdtr.cbGdt = 0;
482	}
483	pVM->selm.s.fGDTRangeRegistered = false;
484	#endif
485	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
486	if (pVM->selm.s.GCPtrGuestLdt != ~0U)
487	{
488	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
489	AssertRC(rc);
490	pVM->selm.s.GCPtrGuestLdt = ~0U;
491	}
492	#endif
493	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
494	if (pVM->selm.s.GCPtrGuestTss != ~0U)
495	{
496	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
497	AssertRC(rc);
498	pVM->selm.s.GCPtrGuestTss = ~0U;
499	pVM->selm.s.GCSelTss = ~0;
500	}
501	#endif
502
503	/*
504	* Re-initialize other members.
505	*/
506	pVM->selm.s.cbLdtLimit = 0;
507	pVM->selm.s.offLdtHyper = 0;
508	pVM->selm.s.cbMonitoredGuestTss = 0;
509
510	pVM->selm.s.fSyncTSSRing0Stack = false;
511
512	/*
513	* Default action when entering raw mode for the first time
514	*/
515	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
516	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
517	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
518	}
519
520	/**
521	* Disable GDT/LDT/TSS monitoring and syncing
522	*
523	* @param pVM The VM to operate on.
524	*/
525	SELMR3DECL(void) SELMR3DisableMonitoring(PVM pVM)
526	{
527	/*
528	* Uninstall guest GDT/LDT/TSS write access handlers.
529	*/
530	int rc;
531	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
532	if (pVM->selm.s.GuestGdtr.pGdt != ~0U && pVM->selm.s.fGDTRangeRegistered)
533	{
534	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
535	AssertRC(rc);
536	pVM->selm.s.GuestGdtr.pGdt = ~0U;
537	pVM->selm.s.GuestGdtr.cbGdt = 0;
538	}
539	pVM->selm.s.fGDTRangeRegistered = false;
540	#endif
541	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
542	if (pVM->selm.s.GCPtrGuestLdt != ~0U)
543	{
544	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
545	AssertRC(rc);
546	pVM->selm.s.GCPtrGuestLdt = ~0U;
547	}
548	#endif
549	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
550	if (pVM->selm.s.GCPtrGuestTss != ~0U)
551	{
552	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
553	AssertRC(rc);
554	pVM->selm.s.GCPtrGuestTss = ~0U;
555	pVM->selm.s.GCSelTss = ~0;
556	}
557	#endif
558
559	/*
560	* Unregister shadow GDT/LDT/TSS write access handlers.
561	*/
562	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
563	if (pVM->selm.s.paGdtGC != 0)
564	{
565	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtGC);
566	AssertRC(rc);
567	pVM->selm.s.paGdtGC = 0;
568	}
569	#endif
570	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
571	if (pVM->selm.s.GCPtrTss != ~0U)
572	{
573	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrTss);
574	AssertRC(rc);
575	pVM->selm.s.GCPtrTss = ~0U;
576	}
577	#endif
578	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
579	if (pVM->selm.s.GCPtrLdt != ~0U)
580	{
581	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrLdt);
582	AssertRC(rc);
583	pVM->selm.s.GCPtrLdt = ~0U;
584	}
585	#endif
586
587	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_TSS);
588	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_GDT);
589	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_LDT);
590
591	pVM->selm.s.fDisableMonitoring = true;
592	}
593
594	/**
595	* Execute state save operation.
596	*
597	* @returns VBox status code.
598	* @param pVM VM Handle.
599	* @param pSSM SSM operation handle.
600	*/
601	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
602	{
603	LogFlow(("selmR3Save:\n"));
604
605	/*
606	* Save the basic bits - fortunately all the other things can be resynced on load.
607	*/
608	PSELM pSelm = &pVM->selm.s;
609
610	SSMR3PutBool(pSSM, pSelm->fDisableMonitoring);
611	SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
612	SSMR3PutSel(pSSM, pSelm->SelCS);
613	SSMR3PutSel(pSSM, pSelm->SelDS);
614	SSMR3PutSel(pSSM, pSelm->SelCS64);
615	SSMR3PutSel(pSSM, pSelm->SelCS64); //reserved for DS64.
616	SSMR3PutSel(pSSM, pSelm->SelTSS);
617	return SSMR3PutSel(pSSM, pSelm->SelTSSTrap08);
618	}
619
620
621	/**
622	* Execute state load operation.
623	*
624	* @returns VBox status code.
625	* @param pVM VM Handle.
626	* @param pSSM SSM operation handle.
627	* @param u32Version Data layout version.
628	*/
629	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
630	{
631	LogFlow(("selmR3Load:\n"));
632
633	/*
634	* Validate version.
635	*/
636	if (u32Version != SELM_SAVED_STATE_VERSION)
637	{
638	Log(("selmR3Load: Invalid version u32Version=%d!\n", u32Version));
639	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
640	}
641
642	/*
643	* Do a reset.
644	*/
645	SELMR3Reset(pVM);
646
647	/* Get the monitoring flag. */
648	SSMR3GetBool(pSSM, &pVM->selm.s.fDisableMonitoring);
649
650	/* Get the TSS state flag. */
651	SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
652
653	/*
654	* Get the selectors.
655	*/
656	RTSEL SelCS;
657	SSMR3GetSel(pSSM, &SelCS);
658	RTSEL SelDS;
659	SSMR3GetSel(pSSM, &SelDS);
660	RTSEL SelCS64;
661	SSMR3GetSel(pSSM, &SelCS64);
662	RTSEL SelDS64;
663	SSMR3GetSel(pSSM, &SelDS64);
664	RTSEL SelTSS;
665	SSMR3GetSel(pSSM, &SelTSS);
666	RTSEL SelTSSTrap08;
667	SSMR3GetSel(pSSM, &SelTSSTrap08);
668	if (u32Version == 1)
669	{
670	RTSEL SelTSSTrap0a;
671	int rc = SSMR3GetSel(pSSM, &SelTSSTrap0a);
672	if (VBOX_FAILURE(rc))
673	return rc;
674	}
675
676	/* Check that no selectors have be relocated. */
677	PSELM pSelm = &pVM->selm.s;
678	if ( SelCS != pSelm->SelCS
679	\|\| SelDS != pSelm->SelDS
680	\|\| SelCS64 != pSelm->SelCS64
681	\|\| SelDS64 != pSelm->SelCS64
682	\|\| SelTSS != pSelm->SelTSS
683	\|\| SelTSSTrap08 != pSelm->SelTSSTrap08)
684	{
685	AssertMsgFailed(("Some selector have been relocated - this cannot happen!\n"));
686	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
687	}
688
689	return VINF_SUCCESS;
690	}
691
692
693	/**
694	* Sync the GDT, LDT and TSS after loading the state.
695	*
696	* Just to play save, we set the FFs to force syncing before
697	* executing GC code.
698	*
699	* @returns VBox status code.
700	* @param pVM VM Handle.
701	* @param pSSM SSM operation handle.
702	*/
703	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
704	{
705	LogFlow(("selmR3LoadDone:\n"));
706
707	/*
708	* Don't do anything if it's a load failure.
709	*/
710	int rc = SSMR3HandleGetStatus(pSSM);
711	if (VBOX_FAILURE(rc))
712	return VINF_SUCCESS;
713
714	/*
715	* Do the syncing if we're in protected mode.
716	*/
717	if (PGMGetGuestMode(pVM) != PGMMODE_REAL)
718	{
719	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
720	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
721	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
722	SELMR3UpdateFromCPUM(pVM);
723	}
724
725	/*
726	* Flag everything for resync on next raw mode entry.
727	*/
728	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
729	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
730	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
731
732	return VINF_SUCCESS;
733	}
734
735
736	/**
737	* Sets up the virtualization of a guest GDT.
738	*
739	* @returns VBox status code.
740	* @param pVM The VM to operate on.
741	* @param paGDTEs Pointer to GDT array.
742	* @param cGDTEs Number of entries in the GDT array.
743	*/
744	SELMR3DECL(int) SELMR3GdtSetup(PVM pVM, PCVBOXDESC paGDTEs, unsigned cGDTEs)
745	{
746	AssertMsg(cGDTEs <= (unsigned)(pVM->selm.s.SelTSSTrap08 >> 3), ("Oops! the loaded GDT is as large as our.. we assume no clashes!!!\n"));
747
748	/*
749	* Enumerate the array.
750	*/
751	PCVBOXDESC pGDTESrc = paGDTEs;
752	PVBOXDESC pGDTEDst = pVM->selm.s.paGdtHC;
753	for (unsigned iGDT = 0; iGDT < cGDTEs; iGDT++, pGDTEDst++, pGDTESrc++)
754	{
755	/* ASSUME no clashes for now - lazy bird!!! */
756	if (pGDTESrc->Gen.u1Present)
757	{
758	pGDTEDst->Gen = pGDTESrc->Gen;
759	/* mark non ring-3 selectors as not present. */
760	if (pGDTEDst->Gen.u2Dpl != 3)
761	pGDTEDst->Gen.u1Present = 0;
762	}
763	else
764	{
765	/* zero it. */
766	pGDTEDst->au32[0] = 0;
767	pGDTEDst->au32[1] = 0;
768	}
769	}
770
771	return VINF_SUCCESS;
772	}
773
774
775	/**
776	* Updates the Guest GDT & LDT virtualization based on current CPU state.
777	*
778	* @returns VBox status code.
779	* @param pVM The VM to operate on.
780	*/
781	SELMR3DECL(int) SELMR3UpdateFromCPUM(PVM pVM)
782	{
783	int rc = VINF_SUCCESS;
784
785	if (pVM->selm.s.fDisableMonitoring)
786	{
787	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_GDT);
788	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_LDT);
789	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_TSS);
790
791	return VINF_SUCCESS;
792	}
793
794	STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
795
796	/*
797	* GDT sync
798	*/
799	if (VM_FF_ISSET(pVM, VM_FF_SELM_SYNC_GDT))
800	{
801	/*
802	* Always assume the best
803	*/
804	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_GDT);
805
806	/* If the GDT was changed, then make sure the LDT is checked too */
807	/** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
808	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
809	/* Same goes for the TSS selector */
810	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
811
812	/*
813	* Get the GDTR and check if there is anything to do (there usually is).
814	*/
815	VBOXGDTR GDTR;
816	CPUMGetGuestGDTR(pVM, &GDTR);
817	if (GDTR.cbGdt < sizeof(VBOXDESC))
818	{
819	Log(("No GDT entries...\n"));
820	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
821	return VINF_SUCCESS;
822	}
823
824	/*
825	* Read the Guest GDT.
826	* ASSUMES that the entire GDT is in memory.
827	*/
828	RTUINT cbEffLimit = GDTR.cbGdt;
829	PVBOXDESC pGDTE = &pVM->selm.s.paGdtHC[1];
830	rc = PGMPhysReadGCPtr(pVM, pGDTE, GDTR.pGdt + sizeof(VBOXDESC), cbEffLimit + 1 - sizeof(VBOXDESC));
831	if (VBOX_FAILURE(rc))
832	{
833	/*
834	* Read it page by page.
835	*
836	* Keep track of the last valid page and delay memsets and
837	* adjust cbEffLimit to reflect the effective size. The latter
838	* is something we do in the belief that the guest will probably
839	* never actually commit the last page, thus allowing us to keep
840	* our selectors in the high end of the GDT.
841	*/
842	RTUINT cbLeft = cbEffLimit + 1 - sizeof(VBOXDESC);
843	RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(VBOXDESC);
844	uint8_t pu8Dst = (uint8_t )&pVM->selm.s.paGdtHC[1];
845	uint8_t *pu8DstInvalid = pu8Dst;
846
847	while (cbLeft)
848	{
849	RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
850	cb = RT_MIN(cb, cbLeft);
851	rc = PGMPhysReadGCPtr(pVM, pu8Dst, GCPtrSrc, cb);
852	if (VBOX_SUCCESS(rc))
853	{
854	if (pu8DstInvalid != pu8Dst)
855	memset(pu8DstInvalid, 0, pu8Dst - pu8DstInvalid);
856	GCPtrSrc += cb;
857	pu8Dst += cb;
858	pu8DstInvalid = pu8Dst;
859	}
860	else if ( rc == VERR_PAGE_NOT_PRESENT
861	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
862	{
863	GCPtrSrc += cb;
864	pu8Dst += cb;
865	}
866	else
867	{
868	AssertReleaseMsgFailed(("Couldn't read GDT at %RX32, rc=%Vrc!\n", GDTR.pGdt, rc));
869	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
870	return VERR_NOT_IMPLEMENTED;
871	}
872	cbLeft -= cb;
873	}
874
875	/* any invalid pages at the end? */
876	if (pu8DstInvalid != pu8Dst)
877	{
878	cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtHC - 1;
879	/* If any GDTEs was invalidated, zero them. */
880	if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
881	memset(pu8DstInvalid + cbEffLimit + 1, 0, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
882	}
883
884	/* keep track of the effective limit. */
885	if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
886	{
887	Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
888	pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
889	pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
890	}
891	}
892
893	/*
894	* Check if the Guest GDT intrudes on our GDT entries.
895	*/
896	// RTSEL aHyperGDT[MAX_NEEDED_HYPERVISOR_GDTS];
897	if (cbEffLimit >= pVM->selm.s.SelTSSTrap08)
898	{
899	#if 0
900	PVBOXDESC pGDTEStart = pVM->selm.s.paGdtHC;
901	PVBOXDESC pGDTE = (PVBOXDESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(VBOXDESC));
902	int iGDT = 0;
903
904	/* Disabling this for now; previously saw triple faults with OS/2, before fixing the above if statement */
905	Log(("Internal SELM GDT conflict: use non-present entries\n"));
906	while (pGDTE > pGDTEStart && iGDT < MAX_NEEDED_HYPERVISOR_GDTS)
907	{
908	/* We can reuse non-present entries */
909	if (!pGDTE->Gen.u1Present)
910	{
911	aHyperGDT[iGDT] = ((uintptr_t)pGDTE - (uintptr_t)pVM->selm.s.paGdtHC) / sizeof(VBOXDESC);
912	aHyperGDT[iGDT] = aHyperGDT[iGDT] << X86_SEL_SHIFT;
913	Log(("SELM: Found unused GDT %04X\n", aHyperGDT[iGDT]));
914	iGDT++;
915	}
916
917	pGDTE--;
918	}
919	if (iGDT != MAX_NEEDED_HYPERVISOR_GDTS)
920	#endif
921	{
922	AssertReleaseMsgFailed(("Internal SELM GDT conflict.\n"));
923	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
924	return VERR_NOT_IMPLEMENTED;
925	}
926	}
927
928	/*
929	* Work thru the copied GDT entries adjusting them for correct virtualization.
930	*/
931	PVBOXDESC pGDTEEnd = (PVBOXDESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(VBOXDESC));
932	while (pGDTE < pGDTEEnd)
933	{
934	if (pGDTE->Gen.u1Present)
935	{
936	/*
937	* Code and data selectors are generally 1:1, with the
938	* 'little' adjustment we do for DPL 0 selectors.
939	*/
940	if (pGDTE->Gen.u1DescType)
941	{
942	/*
943	* Hack for A-bit against Trap E on read-only GDT.
944	*/
945	/** @todo Fix this by loading ds and cs before turning off WP. */
946	pGDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
947
948	/*
949	* All DPL 0 code and data segments are squeezed into DPL 1.
950	*
951	* We're skipping conforming segments here because those
952	* cannot give us any trouble.
953	*/
954	if ( pGDTE->Gen.u2Dpl == 0
955	&& (pGDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
956	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
957	pGDTE->Gen.u2Dpl = 1;
958	}
959	else
960	{
961	/*
962	* System type selectors are marked not present.
963	* Recompiler or special handling is required for these.
964	*/
965	/** @todo what about interrupt gates and rawr0? */
966	pGDTE->Gen.u1Present = 0;
967	}
968	}
969
970	/* Next GDT entry. */
971	pGDTE++;
972	}
973
974	#if 0 /** @todo r=bird: The relocation code won't be working right. Start with the IF below. */
975	/*
976	* Check if the Guest GDT intrudes on our GDT entries.
977	*/
978	if (cbEffLimit >= pVM->selm.s.SelTSSTrap08)
979	{
980	/* Reinitialize our hypervisor GDTs */
981	pVM->selm.s.SelCS = aHyperGDT[0];
982	pVM->selm.s.SelDS = aHyperGDT[1];
983	pVM->selm.s.SelCS64 = aHyperGDT[2];
984	pVM->selm.s.SelTSS = aHyperGDT[3];
985	pVM->selm.s.SelTSSTrap08 = aHyperGDT[4];
986	SELMR3Relocate(pVM); /** @todo r=bird: Must call VMR3Relocate! */
987	}
988	#endif
989
990	/*
991	* Adjust the cached GDT limit.
992	* Any GDT entries which have been removed must be cleared.
993	*/
994	if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
995	{
996	if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
997	memset(pGDTE, 0, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
998	#ifndef SELM_TRACK_GUEST_GDT_CHANGES
999	pVM->selm.s.GuestGdtr.cbGdt = GDTR.cbGdt;
1000	#endif
1001	}
1002
1003	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
1004	/*
1005	* Check if Guest's GDTR is changed.
1006	*/
1007	if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
1008	\|\| GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1009	{
1010	Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%08X cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
1011
1012	/*
1013	* [Re]Register write virtual handler for guest's GDT.
1014	*/
1015	if (pVM->selm.s.GuestGdtr.pGdt != ~0U && pVM->selm.s.fGDTRangeRegistered)
1016	{
1017	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
1018	AssertRC(rc);
1019	}
1020
1021	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1022	0, selmGuestGDTWriteHandler, "selmgcGuestGDTWriteHandler", 0, "Guest GDT write access handler");
1023	if (VBOX_FAILURE(rc))
1024	return rc;
1025
1026	/* Update saved Guest GDTR. */
1027	pVM->selm.s.GuestGdtr = GDTR;
1028	pVM->selm.s.fGDTRangeRegistered = true;
1029	}
1030	#endif
1031	}
1032
1033	/*
1034	* TSS sync
1035	*/
1036	if (VM_FF_ISSET(pVM, VM_FF_SELM_SYNC_TSS))
1037	{
1038	SELMR3SyncTSS(pVM);
1039	}
1040
1041	/*
1042	* LDT sync
1043	*/
1044	if (VM_FF_ISSET(pVM, VM_FF_SELM_SYNC_LDT))
1045	{
1046	/*
1047	* Always assume the best
1048	*/
1049	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_LDT);
1050
1051	/*
1052	* LDT handling is done similarly to the GDT handling with a shadow
1053	* array. However, since the LDT is expected to be swappable (at least
1054	* some ancient OSes makes it swappable) it must be floating and
1055	* synced on a per-page basis.
1056	*
1057	* Eventually we will change this to be fully on demand. Meaning that
1058	* we will only sync pages containing LDT selectors actually used and
1059	* let the #PF handler lazily sync pages as they are used.
1060	* (This applies to GDT too, when we start making OS/2 fast.)
1061	*/
1062
1063	/*
1064	* First, determin the current LDT selector.
1065	*/
1066	RTSEL SelLdt = CPUMGetGuestLDTR(pVM);
1067	if ((SelLdt & X86_SEL_MASK) == 0)
1068	{
1069	/* ldtr = 0 - update hyper LDTR and deregister any active handler. */
1070	CPUMSetHyperLDTR(pVM, 0);
1071	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1072	if (pVM->selm.s.GCPtrGuestLdt != ~0U)
1073	{
1074	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1075	AssertRC(rc);
1076	pVM->selm.s.GCPtrGuestLdt = ~0U;
1077	}
1078	#endif
1079	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1080	return VINF_SUCCESS;
1081	}
1082
1083	/*
1084	* Get the LDT selector.
1085	*/
1086	PVBOXDESC pDesc = &pVM->selm.s.paGdtHC[SelLdt >> X86_SEL_SHIFT];
1087	RTGCPTR GCPtrLdt = pDesc->Gen.u16BaseLow \| (pDesc->Gen.u8BaseHigh1 << 16) \| (pDesc->Gen.u8BaseHigh2 << 24);
1088	unsigned cbLdt = pDesc->Gen.u16LimitLow \| (pDesc->Gen.u4LimitHigh << 16);
1089	if (pDesc->Gen.u1Granularity)
1090	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1091
1092	/*
1093	* Validate it.
1094	*/
1095	if ( !cbLdt
1096	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
1097	\|\| pDesc->Gen.u1DescType
1098	\|\| pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1099	{
1100	AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
1101
1102	/* cbLdt > 0:
1103	* This is quite impossible, so we do as most people do when faced with
1104	* the impossible, we simply ignore it.
1105	*/
1106	CPUMSetHyperLDTR(pVM, 0);
1107	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1108	if (pVM->selm.s.GCPtrGuestLdt != ~0U)
1109	{
1110	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1111	AssertRC(rc);
1112	pVM->selm.s.GCPtrGuestLdt = ~0U;
1113	}
1114	#endif
1115	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1116	return VINF_SUCCESS;
1117	}
1118	/** @todo check what intel does about odd limits. */
1119	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(VBOXDESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1120
1121	/*
1122	* Use the cached guest ldt address if the descriptor has already been modified (see below)
1123	* (this is necessary due to redundant LDT updates; see todo above at GDT sync)
1124	*/
1125	if (MMHyperIsInsideArea(pVM, GCPtrLdt) == true)
1126	GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
1127
1128
1129	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
1130	/** @todo Handle only present LDT segments. */
1131	// if (pDesc->Gen.u1Present)
1132	{
1133	/*
1134	* Check if Guest's LDT address/limit is changed.
1135	*/
1136	if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
1137	\|\| cbLdt != pVM->selm.s.cbLdtLimit)
1138	{
1139	Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %VGv:%04x to %VGv:%04x. (GDTR=%VGv:%04x)\n",
1140	pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1141
1142	/*
1143	* [Re]Register write virtual handler for guest's GDT.
1144	* In the event of LDT overlapping something, don't install it just assume it's being updated.
1145	*/
1146	if (pVM->selm.s.GCPtrGuestLdt != ~0U)
1147	{
1148	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
1149	AssertRC(rc);
1150	}
1151	#ifdef DEBUG
1152	if (pDesc->Gen.u1Present)
1153	Log(("LDT selector marked not present!!\n"));
1154	#endif
1155	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
1156	0, selmGuestLDTWriteHandler, "selmgcGuestLDTWriteHandler", 0, "Guest LDT write access handler");
1157	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1158	{
1159	/** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
1160	pVM->selm.s.GCPtrGuestLdt = ~0;
1161	Log(("WARNING: Guest LDT (%VGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%VGv:%04x)\n",
1162	GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1163	}
1164	else if (VBOX_SUCCESS(rc))
1165	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1166	else
1167	{
1168	CPUMSetHyperLDTR(pVM, 0);
1169	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1170	return rc;
1171	}
1172
1173	pVM->selm.s.cbLdtLimit = cbLdt;
1174	}
1175	}
1176	#else
1177	pVM->selm.s.cbLdtLimit = cbLdt;
1178	#endif
1179
1180	/*
1181	* Calc Shadow LDT base.
1182	*/
1183	unsigned off;
1184	pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
1185	RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.GCPtrLdt + off);
1186	PVBOXDESC pShadowLDT = (PVBOXDESC)((uintptr_t)pVM->selm.s.HCPtrLdt + off);
1187
1188	/*
1189	* Enable the LDT selector in the shadow GDT.
1190	*/
1191	pDesc->Gen.u1Present = 1;
1192	pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
1193	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
1194	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
1195	pDesc->Gen.u1Available = 0;
1196	pDesc->Gen.u1Reserved = 0;
1197	if (cbLdt > 0xffff)
1198	{
1199	cbLdt = 0xffff;
1200	pDesc->Gen.u4LimitHigh = 0;
1201	pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
1202	}
1203
1204	/*
1205	* Set Hyper LDTR and notify TRPM.
1206	*/
1207	CPUMSetHyperLDTR(pVM, SelLdt);
1208
1209	/*
1210	* Loop synchronising the LDT page by page.
1211	*/
1212	/** @todo investigate how intel handle various operations on half present cross page entries. */
1213	off = GCPtrLdt & (sizeof(VBOXDESC) - 1);
1214	AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
1215	GCPtrLdt += sizeof(VBOXDESC);
1216	pShadowLDT++;
1217	unsigned cbLeft = cbLdt + 1 - sizeof(VBOXDESC);
1218	PVBOXDESC pLDTE = pShadowLDT;
1219	while (cbLeft)
1220	{
1221	/*
1222	* Read a chunk.
1223	*/
1224	unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
1225	if (cbChunk > cbLeft)
1226	cbChunk = cbLeft;
1227	rc = PGMPhysReadGCPtr(pVM, pShadowLDT, GCPtrLdt, cbChunk);
1228	if (VBOX_SUCCESS(rc))
1229	{
1230	/*
1231	* Mark page
1232	*/
1233	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
1234	AssertRC(rc);
1235
1236	/*
1237	* Loop thru the available LDT entries.
1238	* Figure out where to start and end and the potential cross pageness of
1239	* things adds a little complexity. pLDTE is updated there and not in the
1240	* 'next' part of the loop. The pLDTEEnd is inclusive.
1241	*/
1242	PVBOXDESC pLDTEEnd = (PVBOXDESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
1243	if (pLDTE + 1 < pShadowLDT)
1244	pLDTE = (PVBOXDESC)((uintptr_t)pShadowLDT + off);
1245	while (pLDTE <= pLDTEEnd)
1246	{
1247	if (pLDTE->Gen.u1Present)
1248	{
1249	/*
1250	* Code and data selectors are generally 1:1, with the
1251	* 'little' adjustment we do for DPL 0 selectors.
1252	*/
1253	if (pLDTE->Gen.u1DescType)
1254	{
1255	/*
1256	* Hack for A-bit against Trap E on read-only GDT.
1257	*/
1258	/** @todo Fix this by loading ds and cs before turning off WP. */
1259	if (!(pLDTE->Gen.u4Type & X86_SEL_TYPE_ACCESSED))
1260	pLDTE->Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
1261
1262	/*
1263	* All DPL 0 code and data segments are squeezed into DPL 1.
1264	*
1265	* We're skipping conforming segments here because those
1266	* cannot give us any trouble.
1267	*/
1268	if ( pLDTE->Gen.u2Dpl == 0
1269	&& (pLDTE->Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
1270	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
1271	pLDTE->Gen.u2Dpl = 1;
1272	}
1273	else
1274	{
1275	/*
1276	* System type selectors are marked not present.
1277	* Recompiler or special handling is required for these.
1278	*/
1279	/** @todo what about interrupt gates and rawr0? */
1280	pLDTE->Gen.u1Present = 0;
1281	}
1282	}
1283
1284	/* Next LDT entry. */
1285	pLDTE++;
1286	}
1287	}
1288	else
1289	{
1290	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%d\n", rc));
1291	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
1292	AssertRC(rc);
1293	}
1294
1295	/*
1296	* Advance to the next page.
1297	*/
1298	cbLeft -= cbChunk;
1299	GCPtrShadowLDT += cbChunk;
1300	pShadowLDT = (PVBOXDESC)((char *)pShadowLDT + cbChunk);
1301	GCPtrLdt += cbChunk;
1302	}
1303	}
1304
1305	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1306	return VINF_SUCCESS;
1307	}
1308
1309
1310	/**
1311	* \#PF Handler callback for virtual access handler ranges.
1312	*
1313	* Important to realize that a physical page in a range can have aliases, and
1314	* for ALL and WRITE handlers these will also trigger.
1315	*
1316	* @returns VINF_SUCCESS if the handler have carried out the operation.
1317	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1318	* @param pVM VM Handle.
1319	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1320	* @param pvPtr The HC mapping of that address.
1321	* @param pvBuf What the guest is reading/writing.
1322	* @param cbBuf How much it's reading/writing.
1323	* @param enmAccessType The access type.
1324	* @param pvUser User argument.
1325	*/
1326	static DECLCALLBACK(int) selmGuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1327	{
1328	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1329	Log(("selmGuestGDTWriteHandler: write to %VGv size %d\n", GCPtr, cbBuf));
1330	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
1331
1332	return VINF_PGM_HANDLER_DO_DEFAULT;
1333	}
1334
1335	/**
1336	* \#PF Handler callback for virtual access handler ranges.
1337	*
1338	* Important to realize that a physical page in a range can have aliases, and
1339	* for ALL and WRITE handlers these will also trigger.
1340	*
1341	* @returns VINF_SUCCESS if the handler have carried out the operation.
1342	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1343	* @param pVM VM Handle.
1344	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1345	* @param pvPtr The HC mapping of that address.
1346	* @param pvBuf What the guest is reading/writing.
1347	* @param cbBuf How much it's reading/writing.
1348	* @param enmAccessType The access type.
1349	* @param pvUser User argument.
1350	*/
1351	static DECLCALLBACK(int) selmGuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1352	{
1353	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1354	Log(("selmGuestLDTWriteHandler: write to %VGv size %d\n", GCPtr, cbBuf));
1355	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
1356	return VINF_PGM_HANDLER_DO_DEFAULT;
1357	}
1358
1359	/**
1360	* \#PF Handler callback for virtual access handler ranges.
1361	*
1362	* Important to realize that a physical page in a range can have aliases, and
1363	* for ALL and WRITE handlers these will also trigger.
1364	*
1365	* @returns VINF_SUCCESS if the handler have carried out the operation.
1366	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1367	* @param pVM VM Handle.
1368	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1369	* @param pvPtr The HC mapping of that address.
1370	* @param pvBuf What the guest is reading/writing.
1371	* @param cbBuf How much it's reading/writing.
1372	* @param enmAccessType The access type.
1373	* @param pvUser User argument.
1374	*/
1375	static DECLCALLBACK(int) selmGuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1376	{
1377	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1378	Log(("selmGuestTSSWriteHandler: write to %VGv size %d\n", GCPtr, cbBuf));
1379	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
1380	return VINF_PGM_HANDLER_DO_DEFAULT;
1381	}
1382
1383	/**
1384	* Check if the TSS ring 0 stack selector and pointer were updated (for now)
1385	*
1386	* @returns VBox status code.
1387	* @param pVM The VM to operate on.
1388	*/
1389	SELMR3DECL(int) SELMR3SyncTSS(PVM pVM)
1390	{
1391	int rc;
1392
1393	if (pVM->selm.s.fDisableMonitoring)
1394	{
1395	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_TSS);
1396	return VINF_SUCCESS;
1397	}
1398
1399	/** @todo r=bird: SELMR3SyncTSS should be VMMAll code.
1400	* All the base, size, flags and stuff must be kept up to date in the CPUM tr register.
1401	*/
1402	STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
1403
1404	Assert(!VM_FF_ISSET(pVM, VM_FF_SELM_SYNC_GDT));
1405	Assert(VM_FF_ISSET(pVM, VM_FF_SELM_SYNC_TSS));
1406
1407	/*
1408	* TSS sync
1409	*/
1410	RTSEL SelTss = CPUMGetGuestTR(pVM);
1411	if (SelTss & X86_SEL_MASK)
1412	{
1413	/** @todo r=bird: strictly speaking, this is wrong as we shouldn't bother with changes to
1414	* the TSS selector once its loaded. There are a bunch of this kind of problems (see Sander's
1415	* comment in the unzip defect)
1416	* The first part here should only be done when we're loading TR. The latter part which is
1417	* updating of the ss0:esp0 pair can be done by the access handler now since we can trap all
1418	* accesses, also REM ones. */
1419
1420	/*
1421	* Guest TR is not NULL.
1422	*/
1423	PVBOXDESC pDesc = &pVM->selm.s.paGdtHC[SelTss >> X86_SEL_SHIFT];
1424	RTGCPTR GCPtrTss = pDesc->Gen.u16BaseLow \| (pDesc->Gen.u8BaseHigh1 << 16) \| (pDesc->Gen.u8BaseHigh2 << 24);
1425	unsigned cbTss = pDesc->Gen.u16LimitLow \| (pDesc->Gen.u4LimitHigh << 16);
1426	if (pDesc->Gen.u1Granularity)
1427	cbTss = (cbTss << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1428	cbTss++;
1429	pVM->selm.s.cbGuestTss = cbTss;
1430	pVM->selm.s.fGuestTss32Bit = pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1431	\|\| pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1432
1433	/* Don't bother with anything but the core structure. (Actually all we care for is the r0 ss.) */
1434	if (cbTss > sizeof(VBOXTSS))
1435	cbTss = sizeof(VBOXTSS);
1436	AssertMsg((GCPtrTss >> PAGE_SHIFT) == ((GCPtrTss + cbTss - 1) >> PAGE_SHIFT),
1437	("GCPtrTss=%VGv cbTss=%#x - We assume everything is inside one page!\n", GCPtrTss, cbTss));
1438
1439	// All system GDTs are marked not present above. That explains why this check fails.
1440	//if (pDesc->Gen.u1Present)
1441	/** @todo Handle only present TSS segments. */
1442	{
1443	/*
1444	* Check if Guest's TSS is changed.
1445	*/
1446	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1447	\|\| cbTss != pVM->selm.s.cbMonitoredGuestTss)
1448	{
1449	Log(("SELMR3UpdateFromCPUM: Guest's TSS is changed to pTss=%08X cbTss=%08X cbGuestTss\n", GCPtrTss, cbTss, pVM->selm.s.cbGuestTss));
1450
1451	/*
1452	* Validate it.
1453	*/
1454	if ( SelTss & X86_SEL_LDT
1455	\|\| !cbTss
1456	\|\| SelTss >= pVM->selm.s.GuestGdtr.cbGdt
1457	\|\| pDesc->Gen.u1DescType
1458	\|\| ( pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_286_TSS_AVAIL
1459	&& pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_286_TSS_BUSY
1460	&& pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1461	&& pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY) )
1462	{
1463	AssertMsgFailed(("Invalid Guest TSS %04x!\n", SelTss));
1464	}
1465	else
1466	{
1467	/*
1468	* [Re]Register write virtual handler for guest's TSS.
1469	*/
1470	if (pVM->selm.s.GCPtrGuestTss != ~0U)
1471	{
1472	rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
1473	AssertRC(rc);
1474	}
1475
1476	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrTss, GCPtrTss + cbTss - 1,
1477	0, selmGuestTSSWriteHandler, "selmgcGuestTSSWriteHandler", 0, "Guest TSS write access handler");
1478	if (VBOX_FAILURE(rc))
1479	{
1480	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1481	return rc;
1482	}
1483
1484	/* Update saved Guest TSS info. */
1485	pVM->selm.s.GCPtrGuestTss = GCPtrTss;
1486	pVM->selm.s.cbMonitoredGuestTss = cbTss;
1487	pVM->selm.s.GCSelTss = SelTss;
1488	}
1489	}
1490
1491	/* Update the ring 0 stack selector and base address */
1492	/* feeling very lazy; reading too much */
1493	VBOXTSS tss;
1494	rc = PGMPhysReadGCPtr(pVM, &tss, GCPtrTss, sizeof(VBOXTSS));
1495	if (VBOX_SUCCESS(rc))
1496	{
1497	#ifdef DEBUG
1498	uint32_t ssr0, espr0;
1499
1500	SELMGetRing1Stack(pVM, &ssr0, &espr0);
1501	ssr0 &= ~1;
1502
1503	if (ssr0 != tss.ss0 \|\| espr0 != tss.esp0)
1504	Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X\n", tss.ss0, tss.esp0));
1505	Log(("offIoBitmap=%#x\n", tss.offIoBitmap));
1506	#endif
1507	/* Update our TSS structure for the guest's ring 1 stack */
1508	SELMSetRing1Stack(pVM, tss.ss0 \| 1, tss.esp0);
1509	}
1510	else
1511	{
1512	/** @note the ring 0 stack selector and base address are updated on demand in this case. */
1513
1514	/** @todo handle these dependencies better! */
1515	TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
1516	TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
1517	pVM->selm.s.fSyncTSSRing0Stack = true;
1518	}
1519	VM_FF_CLEAR(pVM, VM_FF_SELM_SYNC_TSS);
1520	}
1521	}
1522
1523	STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
1524	return VINF_SUCCESS;
1525	}
1526
1527
1528	/**
1529	* Compares the Guest GDT and LDT with the shadow tables.
1530	* This is a VBOX_STRICT only function.
1531	*
1532	* @returns VBox status code.
1533	* @param pVM The VM Handle.
1534	*/
1535	SELMR3DECL(int) SELMR3DebugCheck(PVM pVM)
1536	{
1537	#ifdef VBOX_STRICT
1538	/*
1539	* Get GDTR and check for conflict.
1540	*/
1541	VBOXGDTR GDTR;
1542	CPUMGetGuestGDTR(pVM, &GDTR);
1543	if (GDTR.cbGdt == 0)
1544	return VINF_SUCCESS;
1545
1546	#if 0
1547	if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.SelTSSTrap08 >> X86_SEL_SHIFT))
1548	{
1549	AssertReleaseMsgFailed(("Internal SELM GDT conflict.\n"));
1550	return VERR_NOT_IMPLEMENTED;
1551	}
1552	#endif
1553
1554	if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1555	Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
1556
1557	/*
1558	* Loop thru the GDT checking each entry.
1559	*/
1560	RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
1561	PVBOXDESC pGDTE = pVM->selm.s.paGdtHC;
1562	PVBOXDESC pGDTEEnd = (PVBOXDESC)((uintptr_t)pGDTE + GDTR.cbGdt);
1563	while (pGDTE < pGDTEEnd)
1564	{
1565	VBOXDESC GDTEGuest;
1566	int rc = PGMPhysReadGCPtr(pVM, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
1567	if (VBOX_SUCCESS(rc))
1568	{
1569	if (pGDTE->Gen.u1DescType \|\| pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1570	{
1571	if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
1572	\|\| pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
1573	\|\| pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
1574	\|\| pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
1575	\|\| pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
1576	\|\| pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
1577	\|\| pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
1578	{
1579	unsigned iGDT = pGDTE - pVM->selm.s.paGdtHC;
1580	SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
1581	SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
1582	}
1583	}
1584	}
1585
1586	/* Advance to the next descriptor. */
1587	GCPtrGDTEGuest += sizeof(VBOXDESC);
1588	pGDTE++;
1589	}
1590
1591
1592	/*
1593	* LDT?
1594	*/
1595	RTSEL SelLdt = CPUMGetGuestLDTR(pVM);
1596	if ((SelLdt & X86_SEL_MASK) == 0)
1597	return VINF_SUCCESS;
1598	if (SelLdt > GDTR.cbGdt)
1599	{
1600	Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
1601	return VERR_INTERNAL_ERROR;
1602	}
1603	VBOXDESC LDTDesc;
1604	int rc = PGMPhysReadGCPtr(pVM, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
1605	if (VBOX_FAILURE(rc))
1606	{
1607	Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
1608	return rc;
1609	}
1610	RTGCPTR GCPtrLDTEGuest = LDTDesc.Gen.u16BaseLow \| (LDTDesc.Gen.u8BaseHigh1 << 16) \| (LDTDesc.Gen.u8BaseHigh2 << 24);
1611	unsigned cbLdt = LDTDesc.Gen.u16LimitLow \| (LDTDesc.Gen.u4LimitHigh << 16);
1612	if (LDTDesc.Gen.u1Granularity)
1613	cbLdt = (cbLdt << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1614
1615	/*
1616	* Validate it.
1617	*/
1618	if (!cbLdt)
1619	return VINF_SUCCESS;
1620	/** @todo check what intel does about odd limits. */
1621	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(VBOXDESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1622	if ( LDTDesc.Gen.u1DescType
1623	\|\| LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
1624	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
1625	{
1626	Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
1627	return VERR_INTERNAL_ERROR;
1628	}
1629
1630	/*
1631	* Loop thru the LDT checking each entry.
1632	*/
1633	unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
1634	PVBOXDESC pLDTE = (PVBOXDESC)((uintptr_t)pVM->selm.s.HCPtrLdt + off);
1635	PVBOXDESC pLDTEEnd = (PVBOXDESC)((uintptr_t)pGDTE + cbLdt);
1636	while (pLDTE < pLDTEEnd)
1637	{
1638	VBOXDESC LDTEGuest;
1639	int rc = PGMPhysReadGCPtr(pVM, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
1640	if (VBOX_SUCCESS(rc))
1641	{
1642	if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
1643	\|\| pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
1644	\|\| pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
1645	\|\| pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
1646	\|\| pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
1647	\|\| pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
1648	\|\| pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
1649	{
1650	unsigned iLDT = pLDTE - (PVBOXDESC)((uintptr_t)pVM->selm.s.HCPtrLdt + off);
1651	SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
1652	SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
1653	}
1654	}
1655
1656	/* Advance to the next descriptor. */
1657	GCPtrLDTEGuest += sizeof(VBOXDESC);
1658	pLDTE++;
1659	}
1660
1661	#else
1662	NOREF(pVM);
1663	#endif
1664
1665	return VINF_SUCCESS;
1666	}
1667
1668
1669	/**
1670	* Validates the RawR0 TSS values against the one in the Guest TSS.
1671	*
1672	* @returns true if it matches.
1673	* @returns false and assertions on mismatch..
1674	* @param pVM VM Handle.
1675	*/
1676	SELMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
1677	{
1678	#ifdef VBOX_STRICT
1679
1680	RTSEL SelTss = CPUMGetGuestTR(pVM);
1681	if (SelTss & X86_SEL_MASK)
1682	{
1683	AssertMsg((SelTss & X86_SEL_MASK) == (pVM->selm.s.GCSelTss & X86_SEL_MASK), ("New TSS selector = %04X, old TSS selector = %04X\n", SelTss, pVM->selm.s.GCSelTss));
1684
1685	/*
1686	* Guest TR is not NULL.
1687	*/
1688	PVBOXDESC pDesc = &pVM->selm.s.paGdtHC[SelTss >> X86_SEL_SHIFT];
1689	RTGCPTR GCPtrTss = pDesc->Gen.u16BaseLow \| (pDesc->Gen.u8BaseHigh1 << 16) \| (pDesc->Gen.u8BaseHigh2 << 24);
1690	unsigned cbTss = pDesc->Gen.u16LimitLow \| (pDesc->Gen.u4LimitHigh << 16);
1691	if (pDesc->Gen.u1Granularity)
1692	cbTss = (cbTss << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1693	cbTss++;
1694	/* Don't bother with anything but the core structure. (Actually all we care for is the r0 ss.) */
1695	if (cbTss > sizeof(VBOXTSS))
1696	cbTss = sizeof(VBOXTSS);
1697	AssertMsg((GCPtrTss >> PAGE_SHIFT) == ((GCPtrTss + cbTss - 1) >> PAGE_SHIFT),
1698	("GCPtrTss=%VGv cbTss=%#x - We assume everything is inside one page!\n", GCPtrTss, cbTss));
1699
1700	// All system GDTs are marked not present above. That explains why this check fails.
1701	//if (pDesc->Gen.u1Present)
1702	/** @todo Handle only present TSS segments. */
1703	{
1704	/*
1705	* Check if Guest's TSS was changed.
1706	*/
1707	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1708	\|\| cbTss != pVM->selm.s.cbMonitoredGuestTss)
1709	{
1710	AssertMsgFailed(("Guest's TSS (Sel 0x%X) is changed from %RGv:%04x to %RGv:%04x\n",
1711	SelTss, pVM->selm.s.GCPtrGuestTss, pVM->selm.s.cbMonitoredGuestTss,
1712	GCPtrTss, cbTss));
1713	}
1714	}
1715	}
1716
1717	if (!pVM->selm.s.fSyncTSSRing0Stack)
1718	{
1719	RTGCPTR pGuestTSS = pVM->selm.s.GCPtrGuestTss;
1720	uint32_t ESPR0;
1721	int rc = PGMPhysReadGCPtr(pVM, &ESPR0, pGuestTSS + RT_OFFSETOF(VBOXTSS, esp0), sizeof(ESPR0));
1722	if (VBOX_SUCCESS(rc))
1723	{
1724	RTSEL SelSS0;
1725	rc = PGMPhysReadGCPtr(pVM, &SelSS0, pGuestTSS + RT_OFFSETOF(VBOXTSS, ss0), sizeof(SelSS0));
1726	if (VBOX_SUCCESS(rc))
1727	{
1728	if ( ESPR0 == pVM->selm.s.Tss.esp1
1729	&& SelSS0 == (pVM->selm.s.Tss.ss1 & ~1))
1730	return true;
1731
1732	RTGCPHYS GCPhys;
1733	uint64_t fFlags;
1734
1735	rc = PGMGstGetPage(pVM, pGuestTSS, &fFlags, &GCPhys);
1736	AssertRC(rc);
1737	AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%VGv Phys=%VGp\n",
1738	(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1, SelSS0, ESPR0, pGuestTSS, GCPhys));
1739	}
1740	else
1741	AssertRC(rc);
1742	}
1743	else
1744	/* Happens during early Windows XP boot when it is switching page tables. */
1745	Assert(rc == VINF_SUCCESS \|\| ((rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT) && !(CPUMGetGuestEFlags(pVM) & X86_EFL_IF)));
1746	}
1747	return false;
1748	#else
1749	NOREF(pVM);
1750	return true;
1751	#endif
1752	}
1753
1754
1755	/**
1756	* Returns flat address and limit of LDT by LDT selector from guest GDTR.
1757	*
1758	* Fully validate selector.
1759	*
1760	* @returns VBox status.
1761	* @param pVM VM Handle.
1762	* @param SelLdt LDT selector.
1763	* @param ppvLdt Where to store the flat address of LDT.
1764	* @param pcbLimit Where to store LDT limit.
1765	*/
1766	SELMDECL(int) SELMGetLDTFromSel(PVM pVM, RTSEL SelLdt, PRTGCPTR ppvLdt, unsigned *pcbLimit)
1767	{
1768	/* Get guest GDTR. */
1769	VBOXGDTR GDTR;
1770	CPUMGetGuestGDTR(pVM, &GDTR);
1771
1772	/* Check selector TI and GDT limit. */
1773	if ( SelLdt & X86_SEL_LDT
1774	\|\| (SelLdt > GDTR.cbGdt))
1775	return VERR_INVALID_SELECTOR;
1776
1777	/* Read descriptor from GC. */
1778	VBOXDESC Desc;
1779	int rc = PGMPhysReadGCPtr(pVM, (void *)&Desc, (RTGCPTR)(GDTR.pGdt + (SelLdt & X86_SEL_MASK)), sizeof(Desc));
1780	if (VBOX_FAILURE(rc))
1781	{
1782	/* fatal */
1783	AssertMsgFailed(("Can't read LDT descriptor for selector=%04X\n", SelLdt));
1784	return VERR_SELECTOR_NOT_PRESENT;
1785	}
1786
1787	/* Check if LDT descriptor is not present. */
1788	if (Desc.Gen.u1Present == 0)
1789	return VERR_SELECTOR_NOT_PRESENT;
1790
1791	/* Check LDT descriptor type. */
1792	if ( Desc.Gen.u1DescType == 1
1793	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1794	return VERR_INVALID_SELECTOR;
1795
1796	/* LDT descriptor is ok. */
1797	if (ppvLdt)
1798	{
1799	*ppvLdt = (RTGCPTR)( (Desc.Gen.u8BaseHigh2 << 24)
1800	\| (Desc.Gen.u8BaseHigh1 << 16)
1801	\| Desc.Gen.u16BaseLow);
1802	*pcbLimit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
1803	}
1804	return VINF_SUCCESS;
1805	}
1806
1807
1808	/**
1809	* Gets information about a selector.
1810	* Intended for the debugger mostly and will prefer the guest
1811	* descriptor tables over the shadow ones.
1812	*
1813	* @returns VINF_SUCCESS on success.
1814	* @returns VERR_INVALID_SELECTOR if the selector isn't fully inside the descriptor table.
1815	* @returns VERR_SELECTOR_NOT_PRESENT if the selector wasn't present.
1816	* @returns VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the pagetable or page
1817	* backing the selector table wasn't present.
1818	* @returns Other VBox status code on other errors.
1819	*
1820	* @param pVM VM handle.
1821	* @param Sel The selector to get info about.
1822	* @param pSelInfo Where to store the information.
1823	*/
1824	SELMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, RTSEL Sel, PSELMSELINFO pSelInfo)
1825	{
1826	Assert(pSelInfo);
1827
1828	/*
1829	* Read the descriptor entry
1830	*/
1831	VBOXDESC Desc;
1832	if ( !(Sel & X86_SEL_LDT)
1833	&& ( pVM->selm.s.SelCS == (Sel & X86_SEL_MASK)
1834	\|\| pVM->selm.s.SelDS == (Sel & X86_SEL_MASK)
1835	\|\| pVM->selm.s.SelCS64 == (Sel & X86_SEL_MASK)
1836	\|\| pVM->selm.s.SelTSS == (Sel & X86_SEL_MASK)
1837	\|\| pVM->selm.s.SelTSSTrap08 == (Sel & X86_SEL_MASK))
1838	)
1839	{
1840	/*
1841	* Hypervisor descriptor.
1842	*/
1843	pSelInfo->fHyper = true;
1844	Desc = pVM->selm.s.paGdtHC[Sel >> X86_SEL_SHIFT];
1845	}
1846	else if (CPUMIsGuestInProtectedMode(pVM))
1847	{
1848	/*
1849	* Read it from the guest descriptor table.
1850	*/
1851	pSelInfo->fHyper = false;
1852
1853	VBOXGDTR Gdtr;
1854	RTGCPTR GCPtrDesc;
1855	CPUMGetGuestGDTR(pVM, &Gdtr);
1856	if (!(Sel & X86_SEL_LDT))
1857	{
1858	/* GDT */
1859	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(VBOXDESC) - 1 > (unsigned)Gdtr.cbGdt)
1860	return VERR_INVALID_SELECTOR;
1861	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
1862	}
1863	else
1864	{
1865	/*
1866	* LDT - must locate the LDT first...
1867	*/
1868	RTSEL SelLdt = CPUMGetGuestLDTR(pVM);
1869	if ( (unsigned)(SelLdt & X86_SEL_MASK) < sizeof(VBOXDESC) /* the first selector is invalid, right? */
1870	\|\| (unsigned)(SelLdt & X86_SEL_MASK) + sizeof(VBOXDESC) - 1 > (unsigned)Gdtr.cbGdt)
1871	return VERR_INVALID_SELECTOR;
1872	GCPtrDesc = Gdtr.pGdt + (SelLdt & X86_SEL_MASK);
1873	int rc = PGMPhysReadGCPtr(pVM, &Desc, GCPtrDesc, sizeof(Desc));
1874	if (VBOX_FAILURE(rc))
1875	return rc;
1876
1877	/* validate the LDT descriptor. */
1878	if (Desc.Gen.u1Present == 0)
1879	return VERR_SELECTOR_NOT_PRESENT;
1880	if ( Desc.Gen.u1DescType == 1
1881	\|\| Desc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1882	return VERR_INVALID_SELECTOR;
1883
1884	unsigned cbLimit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
1885	if (Desc.Gen.u1Granularity)
1886	cbLimit = (cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1887	if ((unsigned)(Sel & X86_SEL_MASK) + sizeof(VBOXDESC) - 1 > cbLimit)
1888	return VERR_INVALID_SELECTOR;
1889
1890	/* calc the descriptor location. */
1891	GCPtrDesc = (Desc.Gen.u8BaseHigh2 << 24)
1892	\| (Desc.Gen.u8BaseHigh1 << 16)
1893	\| Desc.Gen.u16BaseLow;
1894	GCPtrDesc += (Sel & X86_SEL_MASK);
1895	}
1896
1897	/* read the descriptor. */
1898	int rc = PGMPhysReadGCPtr(pVM, &Desc, GCPtrDesc, sizeof(Desc));
1899	if (VBOX_FAILURE(rc))
1900	return rc;
1901	}
1902	else
1903	{
1904	/*
1905	* We're in real mode.
1906	*/
1907	pSelInfo->Sel = Sel;
1908	pSelInfo->GCPtrBase = Sel << 4;
1909	pSelInfo->cbLimit = 0xffff;
1910	pSelInfo->fHyper = false;
1911	pSelInfo->fRealMode = true;
1912	memset(&pSelInfo->Raw, 0, sizeof(pSelInfo->Raw));
1913	return VINF_SUCCESS;
1914	}
1915
1916	/*
1917	* Extract the base and limit
1918	*/
1919	pSelInfo->Sel = Sel;
1920	pSelInfo->Raw = Desc;
1921	pSelInfo->cbLimit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
1922	if (Desc.Gen.u1Granularity)
1923	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1924	pSelInfo->GCPtrBase = (Desc.Gen.u8BaseHigh2 << 24)
1925	\| (Desc.Gen.u8BaseHigh1 << 16)
1926	\| Desc.Gen.u16BaseLow;
1927	pSelInfo->fRealMode = false;
1928
1929	return VINF_SUCCESS;
1930	}
1931
1932
1933	/**
1934	* Gets information about a selector from the shadow tables.
1935	*
1936	* This is intended to be faster than the SELMR3GetSelectorInfo() method, but requires
1937	* that the caller ensures that the shadow tables are up to date.
1938	*
1939	* @returns VINF_SUCCESS on success.
1940	* @returns VERR_INVALID_SELECTOR if the selector isn't fully inside the descriptor table.
1941	* @returns VERR_SELECTOR_NOT_PRESENT if the selector wasn't present.
1942	* @returns VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the pagetable or page
1943	* backing the selector table wasn't present.
1944	* @returns Other VBox status code on other errors.
1945	*
1946	* @param pVM VM handle.
1947	* @param Sel The selector to get info about.
1948	* @param pSelInfo Where to store the information.
1949	*/
1950	SELMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PSELMSELINFO pSelInfo)
1951	{
1952	Assert(pSelInfo);
1953
1954	/*
1955	* Read the descriptor entry
1956	*/
1957	VBOXDESC Desc;
1958	if (!(Sel & X86_SEL_LDT))
1959	{
1960	/*
1961	* Global descriptor.
1962	*/
1963	Desc = pVM->selm.s.paGdtHC[Sel >> X86_SEL_SHIFT];
1964	pSelInfo->fHyper = pVM->selm.s.SelCS == (Sel & X86_SEL_MASK)
1965	\|\| pVM->selm.s.SelDS == (Sel & X86_SEL_MASK)
1966	\|\| pVM->selm.s.SelCS64 == (Sel & X86_SEL_MASK)
1967	\|\| pVM->selm.s.SelTSS == (Sel & X86_SEL_MASK)
1968	\|\| pVM->selm.s.SelTSSTrap08 == (Sel & X86_SEL_MASK);
1969	/** @todo check that the GDT offset is valid. */
1970	}
1971	else
1972	{
1973	/*
1974	* Local Descriptor.
1975	*/
1976	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.HCPtrLdt + pVM->selm.s.offLdtHyper);
1977	Desc = paLDT[Sel >> X86_SEL_SHIFT];
1978	/** @todo check if the LDT page is actually available. */
1979	/** @todo check that the LDT offset is valid. */
1980	pSelInfo->fHyper = false;
1981	}
1982
1983	/*
1984	* Extract the base and limit
1985	*/
1986	pSelInfo->Sel = Sel;
1987	pSelInfo->Raw = Desc;
1988	pSelInfo->cbLimit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
1989	if (Desc.Gen.u1Granularity)
1990	pSelInfo->cbLimit = (pSelInfo->cbLimit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
1991	pSelInfo->GCPtrBase = (Desc.Gen.u8BaseHigh2 << 24)
1992	\| (Desc.Gen.u8BaseHigh1 << 16)
1993	\| Desc.Gen.u16BaseLow;
1994	pSelInfo->fRealMode = false;
1995
1996	return VINF_SUCCESS;
1997	}
1998
1999
2000	/**
2001	* Formats a descriptor.
2002	*
2003	* @param Desc Descriptor to format.
2004	* @param Sel Selector number.
2005	* @param pszOutput Output buffer.
2006	* @param cchOutput Size of output buffer.
2007	*/
2008	static void selmR3FormatDescriptor(VBOXDESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
2009	{
2010	/*
2011	* Make variable description string.
2012	*/
2013	static struct
2014	{
2015	unsigned cch;
2016	const char *psz;
2017	} const aTypes[32] =
2018	{
2019	#define STRENTRY(str) { sizeof(str) - 1, str }
2020	/* system */
2021	STRENTRY("Reserved0 "), /* 0x00 */
2022	STRENTRY("TSS16Avail "), /* 0x01 */
2023	STRENTRY("LDT "), /* 0x02 */
2024	STRENTRY("TSS16Busy "), /* 0x03 */
2025	STRENTRY("Call16 "), /* 0x04 */
2026	STRENTRY("Task "), /* 0x05 */
2027	STRENTRY("Int16 "), /* 0x06 */
2028	STRENTRY("Trap16 "), /* 0x07 */
2029	STRENTRY("Reserved8 "), /* 0x08 */
2030	STRENTRY("TSS32Avail "), /* 0x09 */
2031	STRENTRY("ReservedA "), /* 0x0a */
2032	STRENTRY("TSS32Busy "), /* 0x0b */
2033	STRENTRY("Call32 "), /* 0x0c */
2034	STRENTRY("ReservedD "), /* 0x0d */
2035	STRENTRY("Int32 "), /* 0x0e */
2036	STRENTRY("Trap32 "), /* 0x0f */
2037	/* non system */
2038	STRENTRY("DataRO "), /* 0x10 */
2039	STRENTRY("DataRO Accessed "), /* 0x11 */
2040	STRENTRY("DataRW "), /* 0x12 */
2041	STRENTRY("DataRW Accessed "), /* 0x13 */
2042	STRENTRY("DataDownRO "), /* 0x14 */
2043	STRENTRY("DataDownRO Accessed "), /* 0x15 */
2044	STRENTRY("DataDownRW "), /* 0x16 */
2045	STRENTRY("DataDownRW Accessed "), /* 0x17 */
2046	STRENTRY("CodeEO "), /* 0x18 */
2047	STRENTRY("CodeEO Accessed "), /* 0x19 */
2048	STRENTRY("CodeER "), /* 0x1a */
2049	STRENTRY("CodeER Accessed "), /* 0x1b */
2050	STRENTRY("CodeConfEO "), /* 0x1c */
2051	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
2052	STRENTRY("CodeConfER "), /* 0x1e */
2053	STRENTRY("CodeConfER Accessed ") /* 0x1f */
2054	#undef SYSENTRY
2055	};
2056	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
2057	char szMsg[128];
2058	char *psz = &szMsg[0];
2059	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
2060	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
2061	psz += aTypes[i].cch;
2062
2063	if (Desc.Gen.u1Present)
2064	ADD_STR(psz, "Present ");
2065	else
2066	ADD_STR(psz, "Not-Present ");
2067	if (Desc.Gen.u1Granularity)
2068	ADD_STR(psz, "Page ");
2069	if (Desc.Gen.u1DefBig)
2070	ADD_STR(psz, "32-bit ");
2071	else
2072	ADD_STR(psz, "16-bit ");
2073	#undef ADD_STR
2074	*psz = '\0';
2075
2076	/*
2077	* Limit and Base and format the output.
2078	*/
2079	uint32_t u32Limit = Desc.Gen.u4LimitHigh << 16 \| Desc.Gen.u16LimitLow;
2080	if (Desc.Gen.u1Granularity)
2081	u32Limit = u32Limit << PAGE_SHIFT \| PAGE_OFFSET_MASK;
2082	uint32_t u32Base = Desc.Gen.u8BaseHigh2 << 24 \| Desc.Gen.u8BaseHigh1 << 16 \| Desc.Gen.u16BaseLow;
2083
2084	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
2085	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
2086	}
2087
2088
2089	/**
2090	* Dumps a descriptor.
2091	*
2092	* @param Desc Descriptor to dump.
2093	* @param Sel Selector number.
2094	* @param pszMsg Message to prepend the log entry with.
2095	*/
2096	SELMR3DECL(void) SELMR3DumpDescriptor(VBOXDESC Desc, RTSEL Sel, const char *pszMsg)
2097	{
2098	char szOutput[128];
2099	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
2100	Log(("%s: %s\n", pszMsg, szOutput));
2101	NOREF(szOutput[0]);
2102	}
2103
2104
2105	/**
2106	* Display the shadow gdt.
2107	*
2108	* @param pVM VM Handle.
2109	* @param pHlp The info helpers.
2110	* @param pszArgs Arguments, ignored.
2111	*/
2112	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2113	{
2114	pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%VGv):\n", MMHyperHC2GC(pVM, pVM->selm.s.paGdtHC));
2115	for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
2116	{
2117	if (pVM->selm.s.paGdtHC[iGDT].Gen.u1Present)
2118	{
2119	char szOutput[128];
2120	selmR3FormatDescriptor(pVM->selm.s.paGdtHC[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2121	const char *psz = "";
2122	if (iGDT == ((unsigned)pVM->selm.s.SelCS >> X86_SEL_SHIFT))
2123	psz = " HyperCS";
2124	else if (iGDT == ((unsigned)pVM->selm.s.SelDS >> X86_SEL_SHIFT))
2125	psz = " HyperDS";
2126	else if (iGDT == ((unsigned)pVM->selm.s.SelCS64 >> X86_SEL_SHIFT))
2127	psz = " HyperCS64";
2128	else if (iGDT == ((unsigned)pVM->selm.s.SelTSS >> X86_SEL_SHIFT))
2129	psz = " HyperTSS";
2130	else if (iGDT == ((unsigned)pVM->selm.s.SelTSSTrap08 >> X86_SEL_SHIFT))
2131	psz = " HyperTSSTrap08";
2132	pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
2133	}
2134	}
2135	}
2136
2137
2138	/**
2139	* Display the guest gdt.
2140	*
2141	* @param pVM VM Handle.
2142	* @param pHlp The info helpers.
2143	* @param pszArgs Arguments, ignored.
2144	*/
2145	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2146	{
2147	VBOXGDTR GDTR;
2148	CPUMGetGuestGDTR(pVM, &GDTR);
2149	RTGCPTR pGDTGC = (RTGCPTR)GDTR.pGdt;
2150	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(VBOXDESC);
2151
2152	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%VGv limit=%x):\n", pGDTGC, GDTR.cbGdt);
2153	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, pGDTGC += sizeof(VBOXDESC))
2154	{
2155	VBOXDESC GDTE;
2156	int rc = PGMPhysReadGCPtr(pVM, &GDTE, pGDTGC, sizeof(GDTE));
2157	if (VBOX_SUCCESS(rc))
2158	{
2159	if (GDTE.Gen.u1Present)
2160	{
2161	char szOutput[128];
2162	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2163	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2164	}
2165	}
2166	else if (rc == VERR_PAGE_NOT_PRESENT)
2167	{
2168	if ((pGDTGC & PAGE_OFFSET_MASK) + sizeof(VBOXDESC) - 1 < sizeof(VBOXDESC))
2169	pHlp->pfnPrintf(pHlp, "%04 - page not present (GCAddr=%VGv)\n", iGDT << X86_SEL_SHIFT, pGDTGC);
2170	}
2171	else
2172	pHlp->pfnPrintf(pHlp, "%04 - read error rc=%Vrc GCAddr=%VGv\n", iGDT << X86_SEL_SHIFT, rc, pGDTGC);
2173	}
2174	}
2175
2176
2177	/**
2178	* Display the shadow ldt.
2179	*
2180	* @param pVM VM Handle.
2181	* @param pHlp The info helpers.
2182	* @param pszArgs Arguments, ignored.
2183	*/
2184	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2185	{
2186	unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
2187	PVBOXDESC paLDT = (PVBOXDESC)((char *)pVM->selm.s.HCPtrLdt + pVM->selm.s.offLdtHyper);
2188	pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%VGv limit=%d):\n", pVM->selm.s.GCPtrLdt + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
2189	for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
2190	{
2191	if (paLDT[iLDT].Gen.u1Present)
2192	{
2193	char szOutput[128];
2194	selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2195	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2196	}
2197	}
2198	}
2199
2200
2201	/**
2202	* Display the guest ldt.
2203	*
2204	* @param pVM VM Handle.
2205	* @param pHlp The info helpers.
2206	* @param pszArgs Arguments, ignored.
2207	*/
2208	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2209	{
2210	RTSEL SelLdt = CPUMGetGuestLDTR(pVM);
2211	if (!(SelLdt & X86_SEL_MASK))
2212	{
2213	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
2214	return;
2215	}
2216
2217	RTGCPTR pLdtGC;
2218	unsigned cbLdt;
2219	int rc = SELMGetLDTFromSel(pVM, SelLdt, &pLdtGC, &cbLdt);
2220	if (VBOX_FAILURE(rc))
2221	{
2222	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): rc=%Vrc\n", SelLdt, rc);
2223	return;
2224	}
2225
2226	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%VGv limit=%x):\n", SelLdt, pLdtGC, cbLdt);
2227	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
2228	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, pLdtGC += sizeof(VBOXDESC))
2229	{
2230	VBOXDESC LdtE;
2231	int rc = PGMPhysReadGCPtr(pVM, &LdtE, pLdtGC, sizeof(LdtE));
2232	if (VBOX_SUCCESS(rc))
2233	{
2234	if (LdtE.Gen.u1Present)
2235	{
2236	char szOutput[128];
2237	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2238	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2239	}
2240	}
2241	else if (rc == VERR_PAGE_NOT_PRESENT)
2242	{
2243	if ((pLdtGC & PAGE_OFFSET_MASK) + sizeof(VBOXDESC) - 1 < sizeof(VBOXDESC))
2244	pHlp->pfnPrintf(pHlp, "%04 - page not present (GCAddr=%VGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, pLdtGC);
2245	}
2246	else
2247	pHlp->pfnPrintf(pHlp, "%04 - read error rc=%Vrc GCAddr=%VGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, pLdtGC);
2248	}
2249	}
2250
2251
2252	/**
2253	* Dumps the hypervisor GDT
2254	*
2255	* @param pVM VM handle.
2256	*/
2257	SELMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
2258	{
2259	DBGFR3Info(pVM, "gdt", NULL, NULL);
2260	}
2261
2262	/**
2263	* Dumps the hypervisor LDT
2264	*
2265	* @param pVM VM handle.
2266	*/
2267	SELMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
2268	{
2269	DBGFR3Info(pVM, "ldt", NULL, NULL);
2270	}
2271
2272	/**
2273	* Dumps the guest GDT
2274	*
2275	* @param pVM VM handle.
2276	*/
2277	SELMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
2278	{
2279	DBGFR3Info(pVM, "gdtguest", NULL, NULL);
2280	}
2281
2282	/**
2283	* Dumps the guest LDT
2284	*
2285	* @param pVM VM handle.
2286	*/
2287	SELMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
2288	{
2289	DBGFR3Info(pVM, "ldtguest", NULL, NULL);
2290	}
2291

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source: vbox/trunk/src/VBox/VMM/SELM.cpp@ 1313

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