SELM.cpp@ 66651

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1	/* $Id: SELM.cpp 63465 2016-08-15 10:00:20Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_selm SELM - The Selector Manager
19	*
20	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
21	* of a few hyper selector for the raw-mode context. In the hardware assisted
22	* virtualization mode its only task is to decode entries in the guest GDT or
23	* LDT once in a while.
24	*
25	* @see grp_selm
26	*
27	*
28	* @section seg_selm_shadowing Shadowing
29	*
30	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
31	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
32	* The idea is to do it in a more on-demand fashion when we get time. There
33	* also a whole bunch of issues with the current synchronization of all three
34	* tables, see notes and todos in the code.
35	*
36	* When the guest makes changes to the GDT we will try update the shadow copy
37	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
38	*
39	* When the guest make LDT changes we'll trigger a full resync of the LDT
40	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
41	*
42	* The TSS shadowing is limited to the fields we need to care about, namely SS0
43	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
44	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
45	* rather than go the SELMR3SyncTSS() route.
46	*
47	* When in raw-mode SELM also injects a few extra GDT selectors which are used
48	* by the raw-mode (hyper) context. These start their life at the high end of
49	* the table and will be relocated when the guest tries to make use of them...
50	* Well, that was that idea at least, only the code isn't quite there yet which
51	* is why we have trouble with guests which actually have a full sized GDT.
52	*
53	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
54	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
55	*
56	*/
57
58
59	/*********************************************************************************************************************************
60	* Header Files *
61	*********************************************************************************************************************************/
62	#define LOG_GROUP LOG_GROUP_SELM
63	#include <VBox/vmm/selm.h>
64	#include <VBox/vmm/cpum.h>
65	#include <VBox/vmm/stam.h>
66	#include <VBox/vmm/em.h>
67	#include <VBox/vmm/hm.h>
68	#include <VBox/vmm/mm.h>
69	#include <VBox/vmm/ssm.h>
70	#include <VBox/vmm/pgm.h>
71	#include <VBox/vmm/trpm.h>
72	#include <VBox/vmm/dbgf.h>
73	#include "SELMInternal.h"
74	#include <VBox/vmm/vm.h>
75	#include <VBox/err.h>
76	#include <VBox/param.h>
77
78	#include <iprt/assert.h>
79	#include <VBox/log.h>
80	#include <iprt/asm.h>
81	#include <iprt/string.h>
82	#include <iprt/thread.h>
83	#include <iprt/string.h>
84
85	#include "SELMInline.h"
86
87
88	/** SELM saved state version. */
89	#define SELM_SAVED_STATE_VERSION 5
90
91
92	/*********************************************************************************************************************************
93	* Internal Functions *
94	*********************************************************************************************************************************/
95	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
96	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
97	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
98	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
99	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
100	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
101	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
102	//static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
103	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
104
105
106	/*********************************************************************************************************************************
107	* Global Variables *
108	*********************************************************************************************************************************/
109	#if defined(VBOX_WITH_RAW_MODE) && defined(LOG_ENABLED)
110	/** Segment register names. */
111	static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
112	#endif
113
114
115	/**
116	* Initializes the SELM.
117	*
118	* @returns VBox status code.
119	* @param pVM The cross context VM structure.
120	*/
121	VMMR3DECL(int) SELMR3Init(PVM pVM)
122	{
123	int rc;
124	LogFlow(("SELMR3Init\n"));
125
126	/*
127	* Assert alignment and sizes.
128	* (The TSS block requires contiguous back.)
129	*/
130	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
131	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
132	#if 0 /* doesn't work */
133	AssertCompile((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
134	AssertCompile((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
135	#endif
136	AssertRelease((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
137	AssertRelease((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
138	AssertRelease(sizeof(pVM->selm.s.Tss.IntRedirBitmap) == 0x20);
139
140	/*
141	* Init the structure.
142	*/
143	pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
144	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = (SELM_GDT_ELEMENTS - 0x1) << 3;
145	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = (SELM_GDT_ELEMENTS - 0x2) << 3;
146	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = (SELM_GDT_ELEMENTS - 0x3) << 3;
147	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = (SELM_GDT_ELEMENTS - 0x4) << 3;
148	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = (SELM_GDT_ELEMENTS - 0x5) << 3;
149
150	if (HMIsRawModeCtxNeeded(pVM))
151	{
152	/*
153	* Allocate GDT table.
154	*/
155	rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtR3[0]) * SELM_GDT_ELEMENTS,
156	PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtR3);
157	AssertRCReturn(rc, rc);
158
159	/*
160	* Allocate LDT area.
161	*/
162	rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.pvLdtR3);
163	AssertRCReturn(rc, rc);
164	}
165
166	/*
167	* Init Guest's and Shadow GDT, LDT, TSS changes control variables.
168	*/
169	pVM->selm.s.cbEffGuestGdtLimit = 0;
170	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
171	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
172	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
173
174	pVM->selm.s.paGdtRC = NIL_RTRCPTR; /* Must be set in SELMR3Relocate because of monitoring. */
175	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
176	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
177	pVM->selm.s.GCSelTss = RTSEL_MAX;
178
179	pVM->selm.s.fSyncTSSRing0Stack = false;
180
181	/* The I/O bitmap starts right after the virtual interrupt redirection
182	bitmap. Outside the TSS on purpose; the CPU will not check it for
183	I/O operations. */
184	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
185	/* bit set to 1 means no redirection */
186	memset(pVM->selm.s.Tss.IntRedirBitmap, 0xff, sizeof(pVM->selm.s.Tss.IntRedirBitmap));
187
188	/*
189	* Register the virtual access handlers.
190	*/
191	pVM->selm.s.hShadowGdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
192	pVM->selm.s.hShadowLdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
193	pVM->selm.s.hShadowTssWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
194	pVM->selm.s.hGuestGdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
195	pVM->selm.s.hGuestLdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
196	pVM->selm.s.hGuestTssWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
197	#ifdef VBOX_WITH_RAW_MODE
198	if (!HMIsEnabled(pVM))
199	{
200	# ifdef SELM_TRACK_SHADOW_GDT_CHANGES
201	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
202	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
203	NULL /pszHandlerRC/, "selmRCShadowGDTWritePfHandler",
204	"Shadow GDT write access handler", &pVM->selm.s.hShadowGdtWriteHandlerType);
205	AssertRCReturn(rc, rc);
206	# endif
207	# ifdef SELM_TRACK_SHADOW_TSS_CHANGES
208	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
209	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
210	NULL /pszHandlerRC/, "selmRCShadowTSSWritePfHandler",
211	"Shadow TSS write access handler", &pVM->selm.s.hShadowTssWriteHandlerType);
212	AssertRCReturn(rc, rc);
213	# endif
214	# ifdef SELM_TRACK_SHADOW_LDT_CHANGES
215	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
216	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
217	NULL /pszHandlerRC/, "selmRCShadowLDTWritePfHandler",
218	"Shadow LDT write access handler", &pVM->selm.s.hShadowLdtWriteHandlerType);
219	AssertRCReturn(rc, rc);
220	# endif
221	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
222	NULL /pfnInvalidateR3/, selmGuestGDTWriteHandler,
223	"selmGuestGDTWriteHandler", "selmRCGuestGDTWritePfHandler",
224	"Guest GDT write access handler", &pVM->selm.s.hGuestGdtWriteHandlerType);
225	AssertRCReturn(rc, rc);
226	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
227	NULL /pfnInvalidateR3/, selmGuestLDTWriteHandler,
228	"selmGuestLDTWriteHandler", "selmRCGuestLDTWritePfHandler",
229	"Guest LDT write access handler", &pVM->selm.s.hGuestLdtWriteHandlerType);
230	AssertRCReturn(rc, rc);
231	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
232	NULL /pfnInvalidateR3/, selmGuestTSSWriteHandler,
233	"selmGuestTSSWriteHandler", "selmRCGuestTSSWritePfHandler",
234	"Guest TSS write access handler", &pVM->selm.s.hGuestTssWriteHandlerType);
235	AssertRCReturn(rc, rc);
236	}
237	#endif /* VBOX_WITH_RAW_MODE */
238
239	/*
240	* Register the saved state data unit.
241	*/
242	rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
243	NULL, NULL, NULL,
244	NULL, selmR3Save, NULL,
245	NULL, selmR3Load, selmR3LoadDone);
246	if (RT_FAILURE(rc))
247	return rc;
248
249	/*
250	* Statistics.
251	*/
252	if (!HMIsEnabled(pVM))
253	{
254	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.");
255	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.");
256	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.");
257	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.");
258	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.");
259	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.");
260	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.");
261	STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
262	STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
263
264	STAM_REL_REG(pVM, &pVM->selm.s.StatHyperSelsChanged, STAMTYPE_COUNTER, "/SELM/HyperSels/Changed", STAMUNIT_OCCURENCES, "The number of times we had to relocate our hypervisor selectors.");
265	STAM_REL_REG(pVM, &pVM->selm.s.StatScanForHyperSels, STAMTYPE_COUNTER, "/SELM/HyperSels/Scan", STAMUNIT_OCCURENCES, "The number of times we had find free hypervisor selectors.");
266
267	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleES", STAMUNIT_OCCURENCES, "Stale ES was detected in UpdateFromCPUM.");
268	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleCS", STAMUNIT_OCCURENCES, "Stale CS was detected in UpdateFromCPUM.");
269	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleSS", STAMUNIT_OCCURENCES, "Stale SS was detected in UpdateFromCPUM.");
270	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleDS", STAMUNIT_OCCURENCES, "Stale DS was detected in UpdateFromCPUM.");
271	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleFS", STAMUNIT_OCCURENCES, "Stale FS was detected in UpdateFromCPUM.");
272	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleGS", STAMUNIT_OCCURENCES, "Stale GS was detected in UpdateFromCPUM.");
273
274	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleES", STAMUNIT_OCCURENCES, "Already stale ES in UpdateFromCPUM.");
275	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleCS", STAMUNIT_OCCURENCES, "Already stale CS in UpdateFromCPUM.");
276	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleSS", STAMUNIT_OCCURENCES, "Already stale SS in UpdateFromCPUM.");
277	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleDS", STAMUNIT_OCCURENCES, "Already stale DS in UpdateFromCPUM.");
278	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleFS", STAMUNIT_OCCURENCES, "Already stale FS in UpdateFromCPUM.");
279	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleGS", STAMUNIT_OCCURENCES, "Already stale GS in UpdateFromCPUM.");
280
281	STAM_REL_REG(pVM, &pVM->selm.s.StatStaleToUnstaleSReg, STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/StaleToUnstale", STAMUNIT_OCCURENCES, "Transitions from stale to unstale UpdateFromCPUM.");
282
283	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedES", STAMUNIT_OCCURENCES, "Updated hidden ES values in UpdateFromCPUM.");
284	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedCS", STAMUNIT_OCCURENCES, "Updated hidden CS values in UpdateFromCPUM.");
285	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedSS", STAMUNIT_OCCURENCES, "Updated hidden SS values in UpdateFromCPUM.");
286	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedDS", STAMUNIT_OCCURENCES, "Updated hidden DS values in UpdateFromCPUM.");
287	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedFS", STAMUNIT_OCCURENCES, "Updated hidden FS values in UpdateFromCPUM.");
288	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedGS", STAMUNIT_OCCURENCES, "Updated hidden GS values in UpdateFromCPUM.");
289	}
290
291	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelGst, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from guest tables.");
292	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelShw, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedShadow", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from shadow tables.");
293	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelReadErrors, STAMTYPE_COUNTER, "/SELM/LoadHidSel/GstReadErrors", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Guest table read errors.");
294	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelGstNoGood, STAMTYPE_COUNTER, "/SELM/LoadHidSel/NoGoodGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: No good guest table entry.");
295
296	#ifdef VBOX_WITH_RAW_MODE
297	/*
298	* Default action when entering raw mode for the first time
299	*/
300	if (!HMIsEnabled(pVM))
301	{
302	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
303	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
304	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
305	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
306	}
307	#endif
308
309	/*
310	* Register info handlers.
311	*/
312	if (HMIsRawModeCtxNeeded(pVM))
313	{
314	DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
315	DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
316	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
317	}
318	DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
319	DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
320	//DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
321
322	return rc;
323	}
324
325
326	/**
327	* Finalizes HMA page attributes.
328	*
329	* @returns VBox status code.
330	* @param pVM The cross context VM structure.
331	*/
332	VMMR3DECL(int) SELMR3InitFinalize(PVM pVM)
333	{
334	#ifdef VBOX_WITH_RAW_MODE
335	/** @cfgm{/DoubleFault,bool,false}
336	* Enables catching of double faults in the raw-mode context VMM code. This can
337	* be used when the triple faults or hangs occur and one suspect an unhandled
338	* double fault. This is not enabled by default because it means making the
339	* hyper selectors writeable for all supervisor code, including the guest's.
340	* The double fault is a task switch and thus requires write access to the GDT
341	* of the TSS (to set it busy), to the old TSS (to store state), and to the Trap
342	* 8 TSS for the back link.
343	*/
344	bool f;
345	# if defined(DEBUG_bird)
346	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, true);
347	# else
348	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, false);
349	# endif
350	AssertLogRelRCReturn(rc, rc);
351	if (f && HMIsRawModeCtxNeeded(pVM))
352	{
353	PX86DESC paGdt = pVM->selm.s.paGdtR3;
354	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3]), sizeof(paGdt[0]),
355	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
356	AssertRC(rc);
357	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3]), sizeof(paGdt[0]),
358	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
359	AssertRC(rc);
360	rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]),
361	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
362	AssertRC(rc);
363	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]),
364	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
365	AssertRC(rc);
366	}
367	#else /* !VBOX_WITH_RAW_MODE */
368	RT_NOREF(pVM);
369	#endif /* !VBOX_WITH_RAW_MODE */
370	return VINF_SUCCESS;
371	}
372
373
374	/**
375	* Setup the hypervisor GDT selectors in our shadow table
376	*
377	* @param pVM The cross context VM structure.
378	*/
379	static void selmR3SetupHyperGDTSelectors(PVM pVM)
380	{
381	PX86DESC paGdt = pVM->selm.s.paGdtR3;
382
383	/*
384	* Set up global code and data descriptors for use in the guest context.
385	* Both are wide open (base 0, limit 4GB)
386	*/
387	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> 3];
388	pDesc->Gen.u16LimitLow = 0xffff;
389	pDesc->Gen.u4LimitHigh = 0xf;
390	pDesc->Gen.u16BaseLow = 0;
391	pDesc->Gen.u8BaseHigh1 = 0;
392	pDesc->Gen.u8BaseHigh2 = 0;
393	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
394	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
395	pDesc->Gen.u2Dpl = 0; /* supervisor */
396	pDesc->Gen.u1Present = 1;
397	pDesc->Gen.u1Available = 0;
398	pDesc->Gen.u1Long = 0;
399	pDesc->Gen.u1DefBig = 1; /* def 32 bit */
400	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
401
402	/* data */
403	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> 3];
404	pDesc->Gen.u16LimitLow = 0xffff;
405	pDesc->Gen.u4LimitHigh = 0xf;
406	pDesc->Gen.u16BaseLow = 0;
407	pDesc->Gen.u8BaseHigh1 = 0;
408	pDesc->Gen.u8BaseHigh2 = 0;
409	pDesc->Gen.u4Type = X86_SEL_TYPE_RW_ACC;
410	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
411	pDesc->Gen.u2Dpl = 0; /* supervisor */
412	pDesc->Gen.u1Present = 1;
413	pDesc->Gen.u1Available = 0;
414	pDesc->Gen.u1Long = 0;
415	pDesc->Gen.u1DefBig = 1; /* big */
416	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
417
418	/* 64-bit mode code (& data?) */
419	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> 3];
420	pDesc->Gen.u16LimitLow = 0xffff;
421	pDesc->Gen.u4LimitHigh = 0xf;
422	pDesc->Gen.u16BaseLow = 0;
423	pDesc->Gen.u8BaseHigh1 = 0;
424	pDesc->Gen.u8BaseHigh2 = 0;
425	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
426	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
427	pDesc->Gen.u2Dpl = 0; /* supervisor */
428	pDesc->Gen.u1Present = 1;
429	pDesc->Gen.u1Available = 0;
430	pDesc->Gen.u1Long = 1; /* The Long (L) attribute bit. */
431	pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
432	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
433
434	/*
435	* TSS descriptor
436	*/
437	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
438	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
439	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
440	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
441	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
442	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
443	pDesc->Gen.u4LimitHigh = 0;
444	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
445	pDesc->Gen.u1DescType = 0; /* system */
446	pDesc->Gen.u2Dpl = 0; /* supervisor */
447	pDesc->Gen.u1Present = 1;
448	pDesc->Gen.u1Available = 0;
449	pDesc->Gen.u1Long = 0;
450	pDesc->Gen.u1DefBig = 0;
451	pDesc->Gen.u1Granularity = 0; /* byte limit */
452
453	/*
454	* TSS descriptor for trap 08
455	*/
456	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3];
457	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
458	pDesc->Gen.u4LimitHigh = 0;
459	RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.TssTrap08);
460	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
461	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
462	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
463	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
464	pDesc->Gen.u1DescType = 0; /* system */
465	pDesc->Gen.u2Dpl = 0; /* supervisor */
466	pDesc->Gen.u1Present = 1;
467	pDesc->Gen.u1Available = 0;
468	pDesc->Gen.u1Long = 0;
469	pDesc->Gen.u1DefBig = 0;
470	pDesc->Gen.u1Granularity = 0; /* byte limit */
471	}
472
473	/**
474	* Applies relocations to data and code managed by this
475	* component. This function will be called at init and
476	* whenever the VMM need to relocate it self inside the GC.
477	*
478	* @param pVM The cross context VM structure.
479	*/
480	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
481	{
482	PX86DESC paGdt = pVM->selm.s.paGdtR3;
483	LogFlow(("SELMR3Relocate\n"));
484
485	if (HMIsRawModeCtxNeeded(pVM))
486	{
487	for (VMCPUID i = 0; i < pVM->cCpus; i++)
488	{
489	PVMCPU pVCpu = &pVM->aCpus[i];
490
491	/*
492	* Update GDTR and selector.
493	*/
494	CPUMSetHyperGDTR(pVCpu, MMHyperR3ToRC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
495
496	/** @todo selector relocations should be a separate operation? */
497	CPUMSetHyperCS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]);
498	CPUMSetHyperDS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
499	CPUMSetHyperES(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
500	CPUMSetHyperSS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
501	CPUMSetHyperTR(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]);
502	}
503
504	selmR3SetupHyperGDTSelectors(pVM);
505
506	/** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
507	/** @todo PGM knows the proper CR3 values these days, not CPUM. */
508	/*
509	* Update the TSSes.
510	*/
511	/* Only applies to raw mode which supports only 1 VCPU */
512	PVMCPU pVCpu = &pVM->aCpus[0];
513
514	/* Current TSS */
515	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
516	pVM->selm.s.Tss.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
517	pVM->selm.s.Tss.esp0 = VMMGetStackRC(pVCpu);
518	pVM->selm.s.Tss.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
519	pVM->selm.s.Tss.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
520	pVM->selm.s.Tss.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
521	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
522
523	/* trap 08 */
524	pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu); /* this should give use better survival chances. */
525	pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
526	pVM->selm.s.TssTrap08.ss = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
527	pVM->selm.s.TssTrap08.esp0 = VMMGetStackRC(pVCpu) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
528	pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
529	pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
530	pVM->selm.s.TssTrap08.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
531	pVM->selm.s.TssTrap08.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
532	pVM->selm.s.TssTrap08.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
533	pVM->selm.s.TssTrap08.fs = 0;
534	pVM->selm.s.TssTrap08.gs = 0;
535	pVM->selm.s.TssTrap08.selLdt = 0;
536	pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
537	pVM->selm.s.TssTrap08.ecx = VM_RC_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
538	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
539	pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
540	pVM->selm.s.TssTrap08.edx = VM_RC_ADDR(pVM, pVM); /* setup edx VM address. */
541	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
542	pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
543	pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
544	/* TRPM will be updating the eip */
545	}
546
547	if (!HMIsEnabled(pVM))
548	{
549	/*
550	* Update shadow GDT/LDT/TSS write access handlers.
551	*/
552	PVMCPU pVCpu = VMMGetCpu(pVM); NOREF(pVCpu);
553	int rc; NOREF(rc);
554	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
555	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
556	{
557	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.paGdtRC, true /fHypervisor/);
558	AssertRC(rc);
559	}
560	pVM->selm.s.paGdtRC = MMHyperR3ToRC(pVM, paGdt);
561	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowGdtWriteHandlerType,
562	pVM->selm.s.paGdtRC,
563	pVM->selm.s.paGdtRC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
564	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
565	AssertRC(rc);
566	#endif
567	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
568	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
569	{
570	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.pvMonShwTssRC, true /fHypervisor/);
571	AssertRC(rc);
572	}
573	pVM->selm.s.pvMonShwTssRC = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
574	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowTssWriteHandlerType,
575	pVM->selm.s.pvMonShwTssRC,
576	pVM->selm.s.pvMonShwTssRC + sizeof(pVM->selm.s.Tss) - 1,
577	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
578	AssertRC(rc);
579	#endif
580
581	/*
582	* Update the GC LDT region handler and address.
583	*/
584	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
585	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
586	{
587	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.pvLdtRC, true /fHypervisor/);
588	AssertRC(rc);
589	}
590	#endif
591	pVM->selm.s.pvLdtRC = MMHyperR3ToRC(pVM, pVM->selm.s.pvLdtR3);
592	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
593	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowLdtWriteHandlerType,
594	pVM->selm.s.pvLdtRC,
595	pVM->selm.s.pvLdtRC + _64K + PAGE_SIZE - 1,
596	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
597	AssertRC(rc);
598	#endif
599	}
600	}
601
602
603	/**
604	* Terminates the SELM.
605	*
606	* Termination means cleaning up and freeing all resources,
607	* the VM it self is at this point powered off or suspended.
608	*
609	* @returns VBox status code.
610	* @param pVM The cross context VM structure.
611	*/
612	VMMR3DECL(int) SELMR3Term(PVM pVM)
613	{
614	NOREF(pVM);
615	return VINF_SUCCESS;
616	}
617
618
619	/**
620	* The VM is being reset.
621	*
622	* For the SELM component this means that any GDT/LDT/TSS monitors
623	* needs to be removed.
624	*
625	* @param pVM The cross context VM structure.
626	*/
627	VMMR3DECL(void) SELMR3Reset(PVM pVM)
628	{
629	LogFlow(("SELMR3Reset:\n"));
630	VM_ASSERT_EMT(pVM);
631
632	/*
633	* Uninstall guest GDT/LDT/TSS write access handlers.
634	*/
635	PVMCPU pVCpu = VMMGetCpu(pVM); NOREF(pVCpu);
636	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
637	{
638	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
639	int rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GuestGdtr.pGdt, false /fHypervisor/);
640	AssertRC(rc);
641	#endif
642	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
643	pVM->selm.s.GuestGdtr.cbGdt = 0;
644	}
645	pVM->selm.s.fGDTRangeRegistered = false;
646	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
647	{
648	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
649	int rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
650	AssertRC(rc);
651	#endif
652	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
653	}
654	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
655	{
656	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
657	int rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestTss, false /fHypervisor/);
658	AssertRC(rc);
659	#endif
660	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
661	pVM->selm.s.GCSelTss = RTSEL_MAX;
662	}
663
664	/*
665	* Re-initialize other members.
666	*/
667	pVM->selm.s.cbLdtLimit = 0;
668	pVM->selm.s.offLdtHyper = 0;
669	pVM->selm.s.cbMonitoredGuestTss = 0;
670
671	pVM->selm.s.fSyncTSSRing0Stack = false;
672
673	#ifdef VBOX_WITH_RAW_MODE
674	if (!HMIsEnabled(pVM))
675	{
676	/*
677	* Default action when entering raw mode for the first time
678	*/
679	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
680	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
681	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
682	}
683	#endif
684	}
685
686
687	/**
688	* Execute state save operation.
689	*
690	* @returns VBox status code.
691	* @param pVM The cross context VM structure.
692	* @param pSSM SSM operation handle.
693	*/
694	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
695	{
696	LogFlow(("selmR3Save:\n"));
697
698	/*
699	* Save the basic bits - fortunately all the other things can be resynced on load.
700	*/
701	PSELM pSelm = &pVM->selm.s;
702
703	SSMR3PutBool(pSSM, HMIsEnabled(pVM));
704	SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
705	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS]);
706	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_DS]);
707	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]);
708	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]); /* reserved for DS64. */
709	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS]);
710	return SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]);
711	}
712
713
714	/**
715	* Execute state load operation.
716	*
717	* @returns VBox status code.
718	* @param pVM The cross context VM structure.
719	* @param pSSM SSM operation handle.
720	* @param uVersion Data layout version.
721	* @param uPass The data pass.
722	*/
723	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
724	{
725	LogFlow(("selmR3Load:\n"));
726	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
727
728	/*
729	* Validate version.
730	*/
731	if (uVersion != SELM_SAVED_STATE_VERSION)
732	{
733	AssertMsgFailed(("selmR3Load: Invalid version uVersion=%d!\n", uVersion));
734	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
735	}
736
737	/*
738	* Do a reset.
739	*/
740	SELMR3Reset(pVM);
741
742	/* Get the monitoring flag. */
743	bool fIgnored;
744	SSMR3GetBool(pSSM, &fIgnored);
745
746	/* Get the TSS state flag. */
747	SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
748
749	/*
750	* Get the selectors.
751	*/
752	RTSEL SelCS;
753	SSMR3GetSel(pSSM, &SelCS);
754	RTSEL SelDS;
755	SSMR3GetSel(pSSM, &SelDS);
756	RTSEL SelCS64;
757	SSMR3GetSel(pSSM, &SelCS64);
758	RTSEL SelDS64;
759	SSMR3GetSel(pSSM, &SelDS64);
760	RTSEL SelTSS;
761	SSMR3GetSel(pSSM, &SelTSS);
762	RTSEL SelTSSTrap08;
763	SSMR3GetSel(pSSM, &SelTSSTrap08);
764
765	/* Copy the selectors; they will be checked during relocation. */
766	PSELM pSelm = &pVM->selm.s;
767	pSelm->aHyperSel[SELM_HYPER_SEL_CS] = SelCS;
768	pSelm->aHyperSel[SELM_HYPER_SEL_DS] = SelDS;
769	pSelm->aHyperSel[SELM_HYPER_SEL_CS64] = SelCS64;
770	pSelm->aHyperSel[SELM_HYPER_SEL_TSS] = SelTSS;
771	pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SelTSSTrap08;
772
773	return VINF_SUCCESS;
774	}
775
776
777	/**
778	* Sync the GDT, LDT and TSS after loading the state.
779	*
780	* Just to play save, we set the FFs to force syncing before
781	* executing GC code.
782	*
783	* @returns VBox status code.
784	* @param pVM The cross context VM structure.
785	* @param pSSM SSM operation handle.
786	*/
787	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
788	{
789	#ifdef VBOX_WITH_RAW_MODE
790	if (!HMIsEnabled(pVM))
791	{
792	PVMCPU pVCpu = VMMGetCpu(pVM);
793
794	LogFlow(("selmR3LoadDone:\n"));
795
796	/*
797	* Don't do anything if it's a load failure.
798	*/
799	int rc = SSMR3HandleGetStatus(pSSM);
800	if (RT_FAILURE(rc))
801	return VINF_SUCCESS;
802
803	/*
804	* Do the syncing if we're in protected mode and using raw-mode.
805	*/
806	if (PGMGetGuestMode(pVCpu) != PGMMODE_REAL)
807	{
808	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
809	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
810	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
811	SELMR3UpdateFromCPUM(pVM, pVCpu);
812	}
813
814	/*
815	* Flag everything for resync on next raw mode entry.
816	*/
817	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
818	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
819	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
820	}
821
822	#else /* !VBOX_WITH_RAW_MODE */
823	RT_NOREF(pVM, pSSM);
824	#endif /* !VBOX_WITH_RAW_MODE */
825	return VINF_SUCCESS;
826	}
827
828	#ifdef VBOX_WITH_RAW_MODE
829
830	/**
831	* Updates (syncs) the shadow GDT.
832	*
833	* @returns VBox status code.
834	* @param pVM The cross context VM structure.
835	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
836	*/
837	static int selmR3UpdateShadowGdt(PVM pVM, PVMCPU pVCpu)
838	{
839	LogFlow(("selmR3UpdateShadowGdt\n"));
840	Assert(!HMIsEnabled(pVM));
841
842	/*
843	* Always assume the best...
844	*/
845	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
846
847	/* If the GDT was changed, then make sure the LDT is checked too */
848	/** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
849	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
850	/* Same goes for the TSS selector */
851	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
852
853	/*
854	* Get the GDTR and check if there is anything to do (there usually is).
855	*/
856	VBOXGDTR GDTR;
857	CPUMGetGuestGDTR(pVCpu, &GDTR);
858	if (GDTR.cbGdt < sizeof(X86DESC))
859	{
860	Log(("No GDT entries...\n"));
861	return VINF_SUCCESS;
862	}
863
864	/*
865	* Read the Guest GDT.
866	* ASSUMES that the entire GDT is in memory.
867	*/
868	RTUINT cbEffLimit = GDTR.cbGdt;
869	PX86DESC pGDTE = &pVM->selm.s.paGdtR3[1];
870	int rc = PGMPhysSimpleReadGCPtr(pVCpu, pGDTE, GDTR.pGdt + sizeof(X86DESC), cbEffLimit + 1 - sizeof(X86DESC));
871	if (RT_FAILURE(rc))
872	{
873	/*
874	* Read it page by page.
875	*
876	* Keep track of the last valid page and delay memsets and
877	* adjust cbEffLimit to reflect the effective size. The latter
878	* is something we do in the belief that the guest will probably
879	* never actually commit the last page, thus allowing us to keep
880	* our selectors in the high end of the GDT.
881	*/
882	RTUINT cbLeft = cbEffLimit + 1 - sizeof(X86DESC);
883	RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(X86DESC);
884	uint8_t pu8Dst = (uint8_t )&pVM->selm.s.paGdtR3[1];
885	uint8_t *pu8DstInvalid = pu8Dst;
886
887	while (cbLeft)
888	{
889	RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
890	cb = RT_MIN(cb, cbLeft);
891	rc = PGMPhysSimpleReadGCPtr(pVCpu, pu8Dst, GCPtrSrc, cb);
892	if (RT_SUCCESS(rc))
893	{
894	if (pu8DstInvalid != pu8Dst)
895	RT_BZERO(pu8DstInvalid, pu8Dst - pu8DstInvalid);
896	GCPtrSrc += cb;
897	pu8Dst += cb;
898	pu8DstInvalid = pu8Dst;
899	}
900	else if ( rc == VERR_PAGE_NOT_PRESENT
901	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
902	{
903	GCPtrSrc += cb;
904	pu8Dst += cb;
905	}
906	else
907	{
908	AssertLogRelMsgFailed(("Couldn't read GDT at %016RX64, rc=%Rrc!\n", GDTR.pGdt, rc));
909	return VERR_SELM_GDT_READ_ERROR;
910	}
911	cbLeft -= cb;
912	}
913
914	/* any invalid pages at the end? */
915	if (pu8DstInvalid != pu8Dst)
916	{
917	cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtR3 - 1;
918	/* If any GDTEs was invalidated, zero them. */
919	if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
920	RT_BZERO(pu8DstInvalid + cbEffLimit + 1, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
921	}
922
923	/* keep track of the effective limit. */
924	if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
925	{
926	Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
927	pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
928	pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
929	}
930	}
931
932	/*
933	* Check if the Guest GDT intrudes on our GDT entries.
934	*/
935	/** @todo we should try to minimize relocations by making sure our current selectors can be reused. */
936	RTSEL aHyperSel[SELM_HYPER_SEL_MAX];
937	if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
938	{
939	PX86DESC pGDTEStart = pVM->selm.s.paGdtR3;
940	PX86DESC pGDTECur = (PX86DESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(X86DESC));
941	int iGDT = 0;
942
943	Log(("Internal SELM GDT conflict: use non-present entries\n"));
944	STAM_REL_COUNTER_INC(&pVM->selm.s.StatScanForHyperSels);
945	while ((uintptr_t)pGDTECur > (uintptr_t)pGDTEStart)
946	{
947	/* We can reuse non-present entries */
948	if (!pGDTECur->Gen.u1Present)
949	{
950	aHyperSel[iGDT] = ((uintptr_t)pGDTECur - (uintptr_t)pVM->selm.s.paGdtR3) / sizeof(X86DESC);
951	aHyperSel[iGDT] = aHyperSel[iGDT] << X86_SEL_SHIFT;
952	Log(("SELM: Found unused GDT %04X\n", aHyperSel[iGDT]));
953	iGDT++;
954	if (iGDT >= SELM_HYPER_SEL_MAX)
955	break;
956	}
957
958	pGDTECur--;
959	}
960	if (iGDT != SELM_HYPER_SEL_MAX)
961	{
962	AssertLogRelMsgFailed(("Internal SELM GDT conflict.\n"));
963	return VERR_SELM_GDT_TOO_FULL;
964	}
965	}
966	else
967	{
968	aHyperSel[SELM_HYPER_SEL_CS] = SELM_HYPER_DEFAULT_SEL_CS;
969	aHyperSel[SELM_HYPER_SEL_DS] = SELM_HYPER_DEFAULT_SEL_DS;
970	aHyperSel[SELM_HYPER_SEL_CS64] = SELM_HYPER_DEFAULT_SEL_CS64;
971	aHyperSel[SELM_HYPER_SEL_TSS] = SELM_HYPER_DEFAULT_SEL_TSS;
972	aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SELM_HYPER_DEFAULT_SEL_TSS_TRAP08;
973	}
974
975	# ifdef VBOX_WITH_SAFE_STR
976	/* Use the guest's TR selector to plug the str virtualization hole. */
977	if (CPUMGetGuestTR(pVCpu, NULL) != 0)
978	{
979	Log(("SELM: Use guest TSS selector %x\n", CPUMGetGuestTR(pVCpu, NULL)));
980	aHyperSel[SELM_HYPER_SEL_TSS] = CPUMGetGuestTR(pVCpu, NULL);
981	}
982	# endif
983
984	/*
985	* Work thru the copied GDT entries adjusting them for correct virtualization.
986	*/
987	PX86DESC pGDTEEnd = (PX86DESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(X86DESC));
988	while (pGDTE < pGDTEEnd)
989	{
990	if (pGDTE->Gen.u1Present)
991	selmGuestToShadowDesc(pVM, pGDTE);
992
993	/* Next GDT entry. */
994	pGDTE++;
995	}
996
997	/*
998	* Check if our hypervisor selectors were changed.
999	*/
1000	if ( aHyperSel[SELM_HYPER_SEL_CS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]
1001	\|\| aHyperSel[SELM_HYPER_SEL_DS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]
1002	\|\| aHyperSel[SELM_HYPER_SEL_CS64] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64]
1003	\|\| aHyperSel[SELM_HYPER_SEL_TSS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]
1004	\|\| aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08])
1005	{
1006	/* Reinitialize our hypervisor GDTs */
1007	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = aHyperSel[SELM_HYPER_SEL_CS];
1008	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = aHyperSel[SELM_HYPER_SEL_DS];
1009	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = aHyperSel[SELM_HYPER_SEL_CS64];
1010	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = aHyperSel[SELM_HYPER_SEL_TSS];
1011	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
1012
1013	STAM_REL_COUNTER_INC(&pVM->selm.s.StatHyperSelsChanged);
1014
1015	/*
1016	* Do the relocation callbacks to let everyone update their hyper selector dependencies.
1017	* (SELMR3Relocate will call selmR3SetupHyperGDTSelectors() for us.)
1018	*/
1019	VMR3Relocate(pVM, 0);
1020	}
1021	# ifdef VBOX_WITH_SAFE_STR
1022	else if ( cbEffLimit >= SELM_HYPER_DEFAULT_BASE
1023	\|\| CPUMGetGuestTR(pVCpu, NULL) != 0) /* Our shadow TR entry was overwritten when we synced the guest's GDT. */
1024	# else
1025	else if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
1026	# endif
1027	/* We overwrote all entries above, so we have to save them again. */
1028	selmR3SetupHyperGDTSelectors(pVM);
1029
1030	/*
1031	* Adjust the cached GDT limit.
1032	* Any GDT entries which have been removed must be cleared.
1033	*/
1034	if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
1035	{
1036	if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
1037	RT_BZERO(pGDTE, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
1038	}
1039
1040	/*
1041	* Check if Guest's GDTR is changed.
1042	*/
1043	if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
1044	\|\| GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1045	{
1046	Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%016RX64 cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
1047
1048	# ifdef SELM_TRACK_GUEST_GDT_CHANGES
1049	/*
1050	* [Re]Register write virtual handler for guest's GDT.
1051	*/
1052	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
1053	{
1054	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GuestGdtr.pGdt, false /fHypervisor/);
1055	AssertRC(rc);
1056	}
1057	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestGdtWriteHandlerType,
1058	GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1059	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1060	# ifdef VBOX_WITH_RAW_RING1
1061	/** @todo !HACK ALERT!
1062	* Some guest OSes (QNX) share code and the GDT on the same page;
1063	* PGMR3HandlerVirtualRegister doesn't support more than one handler,
1064	* so we kick out the PATM handler as this one is more important. Fix this
1065	* properly in PGMR3HandlerVirtualRegister?
1066	*/
1067	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1068	{
1069	LogRel(("selmR3UpdateShadowGdt: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority GDT page monitor\n", GDTR.pGdt));
1070	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, GDTR.pGdt & PAGE_BASE_GC_MASK, false /fHypervisor/);
1071	AssertRC(rc);
1072	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestGdtWriteHandlerType,
1073	GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1074	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1075	}
1076	# endif
1077	if (RT_FAILURE(rc))
1078	return rc;
1079	# endif /* SELM_TRACK_GUEST_GDT_CHANGES */
1080
1081	/* Update saved Guest GDTR. */
1082	pVM->selm.s.GuestGdtr = GDTR;
1083	pVM->selm.s.fGDTRangeRegistered = true;
1084	}
1085
1086	return VINF_SUCCESS;
1087	}
1088
1089
1090	/**
1091	* Updates (syncs) the shadow LDT.
1092	*
1093	* @returns VBox status code.
1094	* @param pVM The cross context VM structure.
1095	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
1096	*/
1097	static int selmR3UpdateShadowLdt(PVM pVM, PVMCPU pVCpu)
1098	{
1099	LogFlow(("selmR3UpdateShadowLdt\n"));
1100	int rc = VINF_SUCCESS;
1101	Assert(!HMIsEnabled(pVM));
1102
1103	/*
1104	* Always assume the best...
1105	*/
1106	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
1107
1108	/*
1109	* LDT handling is done similarly to the GDT handling with a shadow
1110	* array. However, since the LDT is expected to be swappable (at least
1111	* some ancient OSes makes it swappable) it must be floating and
1112	* synced on a per-page basis.
1113	*
1114	* Eventually we will change this to be fully on demand. Meaning that
1115	* we will only sync pages containing LDT selectors actually used and
1116	* let the #PF handler lazily sync pages as they are used.
1117	* (This applies to GDT too, when we start making OS/2 fast.)
1118	*/
1119
1120	/*
1121	* First, determine the current LDT selector.
1122	*/
1123	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1124	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
1125	{
1126	/* ldtr = 0 - update hyper LDTR and deregister any active handler. */
1127	CPUMSetHyperLDTR(pVCpu, 0);
1128	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1129	{
1130	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1131	AssertRC(rc);
1132	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1133	}
1134	pVM->selm.s.cbLdtLimit = 0;
1135	return VINF_SUCCESS;
1136	}
1137
1138	/*
1139	* Get the LDT selector.
1140	*/
1141	/** @todo this is wrong, use CPUMGetGuestLdtrEx */
1142	PX86DESC pDesc = &pVM->selm.s.paGdtR3[SelLdt >> X86_SEL_SHIFT];
1143	RTGCPTR GCPtrLdt = X86DESC_BASE(pDesc);
1144	uint32_t cbLdt = X86DESC_LIMIT_G(pDesc);
1145
1146	/*
1147	* Validate it.
1148	*/
1149	if ( !cbLdt
1150	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
1151	\|\| pDesc->Gen.u1DescType
1152	\|\| pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1153	{
1154	AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
1155
1156	/* cbLdt > 0:
1157	* This is quite impossible, so we do as most people do when faced with
1158	* the impossible, we simply ignore it.
1159	*/
1160	CPUMSetHyperLDTR(pVCpu, 0);
1161	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1162	{
1163	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1164	AssertRC(rc);
1165	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1166	}
1167	return VINF_SUCCESS;
1168	}
1169	/** @todo check what intel does about odd limits. */
1170	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1171
1172	/*
1173	* Use the cached guest ldt address if the descriptor has already been modified (see below)
1174	* (this is necessary due to redundant LDT updates; see todo above at GDT sync)
1175	*/
1176	if (MMHyperIsInsideArea(pVM, GCPtrLdt))
1177	GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
1178
1179
1180	/** @todo Handle only present LDT segments. */
1181	// if (pDesc->Gen.u1Present)
1182	{
1183	/*
1184	* Check if Guest's LDT address/limit is changed.
1185	*/
1186	if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
1187	\|\| cbLdt != pVM->selm.s.cbLdtLimit)
1188	{
1189	Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %RGv:%04x to %RGv:%04x. (GDTR=%016RX64:%04x)\n",
1190	pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1191
1192	# ifdef SELM_TRACK_GUEST_LDT_CHANGES
1193	/*
1194	* [Re]Register write virtual handler for guest's GDT.
1195	* In the event of LDT overlapping something, don't install it just assume it's being updated.
1196	*/
1197	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1198	{
1199	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1200	AssertRC(rc);
1201	}
1202	# ifdef LOG_ENABLED
1203	if (pDesc->Gen.u1Present)
1204	Log(("LDT selector marked not present!!\n"));
1205	# endif
1206	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestLdtWriteHandlerType,
1207	GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
1208	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1209	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1210	{
1211	/** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
1212	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1213	Log(("WARNING: Guest LDT (%RGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%016RX64:%04x)\n",
1214	GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1215	}
1216	else if (RT_SUCCESS(rc))
1217	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1218	else
1219	{
1220	CPUMSetHyperLDTR(pVCpu, 0);
1221	return rc;
1222	}
1223	# else
1224	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1225	# endif
1226	pVM->selm.s.cbLdtLimit = cbLdt;
1227	}
1228	}
1229
1230	/*
1231	* Calc Shadow LDT base.
1232	*/
1233	unsigned off;
1234	pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
1235	RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.pvLdtRC + off);
1236	PX86DESC pShadowLDT = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1237
1238	/*
1239	* Enable the LDT selector in the shadow GDT.
1240	*/
1241	pDesc->Gen.u1Present = 1;
1242	pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
1243	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
1244	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
1245	pDesc->Gen.u1Available = 0;
1246	pDesc->Gen.u1Long = 0;
1247	if (cbLdt > 0xffff)
1248	{
1249	cbLdt = 0xffff;
1250	pDesc->Gen.u4LimitHigh = 0;
1251	pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
1252	}
1253
1254	/*
1255	* Set Hyper LDTR and notify TRPM.
1256	*/
1257	CPUMSetHyperLDTR(pVCpu, SelLdt);
1258	LogFlow(("selmR3UpdateShadowLdt: Hyper LDTR %#x\n", SelLdt));
1259
1260	/*
1261	* Loop synchronising the LDT page by page.
1262	*/
1263	/** @todo investigate how intel handle various operations on half present cross page entries. */
1264	off = GCPtrLdt & (sizeof(X86DESC) - 1);
1265	AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
1266
1267	/* Note: Do not skip the first selector; unlike the GDT, a zero LDT selector is perfectly valid. */
1268	unsigned cbLeft = cbLdt + 1;
1269	PX86DESC pLDTE = pShadowLDT;
1270	while (cbLeft)
1271	{
1272	/*
1273	* Read a chunk.
1274	*/
1275	unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
1276	if (cbChunk > cbLeft)
1277	cbChunk = cbLeft;
1278	rc = PGMPhysSimpleReadGCPtr(pVCpu, pShadowLDT, GCPtrLdt, cbChunk);
1279	if (RT_SUCCESS(rc))
1280	{
1281	/*
1282	* Mark page
1283	*/
1284	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
1285	AssertRC(rc);
1286
1287	/*
1288	* Loop thru the available LDT entries.
1289	* Figure out where to start and end and the potential cross pageness of
1290	* things adds a little complexity. pLDTE is updated there and not in the
1291	* 'next' part of the loop. The pLDTEEnd is inclusive.
1292	*/
1293	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
1294	if (pLDTE + 1 < pShadowLDT)
1295	pLDTE = (PX86DESC)((uintptr_t)pShadowLDT + off);
1296	while (pLDTE <= pLDTEEnd)
1297	{
1298	if (pLDTE->Gen.u1Present)
1299	selmGuestToShadowDesc(pVM, pLDTE);
1300
1301	/* Next LDT entry. */
1302	pLDTE++;
1303	}
1304	}
1305	else
1306	{
1307	RT_BZERO(pShadowLDT, cbChunk);
1308	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%Rrc\n", rc));
1309	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
1310	AssertRC(rc);
1311	}
1312
1313	/*
1314	* Advance to the next page.
1315	*/
1316	cbLeft -= cbChunk;
1317	GCPtrShadowLDT += cbChunk;
1318	pShadowLDT = (PX86DESC)((char *)pShadowLDT + cbChunk);
1319	GCPtrLdt += cbChunk;
1320	}
1321
1322	return VINF_SUCCESS;
1323	}
1324
1325
1326	/**
1327	* Checks and updates segment selector registers.
1328	*
1329	* @returns VBox strict status code.
1330	* @retval VINF_EM_RESCHEDULE_REM if a stale register was found.
1331	*
1332	* @param pVM The cross context VM structure.
1333	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
1334	*/
1335	static VBOXSTRICTRC selmR3UpdateSegmentRegisters(PVM pVM, PVMCPU pVCpu)
1336	{
1337	Assert(CPUMIsGuestInProtectedMode(pVCpu));
1338	Assert(!HMIsEnabled(pVM));
1339
1340	/*
1341	* No stale selectors in V8086 mode.
1342	*/
1343	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu);
1344	if (pCtx->eflags.Bits.u1VM)
1345	return VINF_SUCCESS;
1346
1347	/*
1348	* Check for stale selectors and load hidden register bits where they
1349	* are missing.
1350	*/
1351	uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
1352	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
1353	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
1354	for (uint32_t iSReg = 0; iSReg < X86_SREG_COUNT; iSReg++)
1355	{
1356	RTSEL const Sel = paSReg[iSReg].Sel;
1357	if (Sel & X86_SEL_MASK_OFF_RPL)
1358	{
1359	/* Get the shadow descriptor entry corresponding to this. */
1360	static X86DESC const s_NotPresentDesc = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
1361	PCX86DESC pDesc;
1362	if (!(Sel & X86_SEL_LDT))
1363	{
1364	if ((Sel \| (sizeof(*pDesc) - 1)) <= pCtx->gdtr.cbGdt)
1365	pDesc = &pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
1366	else
1367	pDesc = &s_NotPresentDesc;
1368	}
1369	else
1370	{
1371	if ((Sel \| (sizeof(*pDesc) - 1)) <= pVM->selm.s.cbLdtLimit)
1372	pDesc = &((PCX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper))[Sel >> X86_SEL_SHIFT];
1373	else
1374	pDesc = &s_NotPresentDesc;
1375	}
1376
1377	/* Check the segment register. */
1378	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
1379	{
1380	if (!(paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE))
1381	{
1382	/* Did it go stale? */
1383	if (selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
1384	{
1385	Log2(("SELM: Detected stale %s=%#x (was valid)\n", g_aszSRegNms[iSReg], Sel));
1386	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
1387	paSReg[iSReg].fFlags \|= CPUMSELREG_FLAGS_STALE;
1388	rcStrict = VINF_EM_RESCHEDULE_REM;
1389	}
1390	}
1391	else
1392	{
1393	/* Did it stop being stale? I.e. did the guest change it things
1394	back to the way they were? */
1395	if (!selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
1396	{
1397	STAM_REL_COUNTER_INC(&pVM->selm.s.StatStaleToUnstaleSReg);
1398	paSReg[iSReg].fFlags &= CPUMSELREG_FLAGS_STALE;
1399	}
1400	else
1401	{
1402	Log2(("SELM: Already stale %s=%#x\n", g_aszSRegNms[iSReg], Sel));
1403	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatAlreadyStaleSReg[iSReg]);
1404	rcStrict = VINF_EM_RESCHEDULE_REM;
1405	}
1406	}
1407	}
1408	/* Load the hidden registers if it's a valid descriptor for the
1409	current segment register. */
1410	else if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
1411	{
1412	selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
1413	STAM_COUNTER_INC(&pVM->selm.s.aStatUpdatedSReg[iSReg]);
1414	}
1415	/* It's stale. */
1416	else
1417	{
1418	Log2(("SELM: Detected stale %s=%#x (wasn't valid)\n", g_aszSRegNms[iSReg], Sel));
1419	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
1420	paSReg[iSReg].fFlags = CPUMSELREG_FLAGS_STALE;
1421	rcStrict = VINF_EM_RESCHEDULE_REM;
1422	}
1423	}
1424	/* else: 0 selector, ignore. */
1425	}
1426
1427	return rcStrict;
1428	}
1429
1430
1431	/**
1432	* Updates the Guest GDT & LDT virtualization based on current CPU state.
1433	*
1434	* @returns VBox status code.
1435	* @param pVM The cross context VM structure.
1436	* @param pVCpu The cross context virtual CPU structure.
1437	*/
1438	VMMR3DECL(VBOXSTRICTRC) SELMR3UpdateFromCPUM(PVM pVM, PVMCPU pVCpu)
1439	{
1440	STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
1441	AssertReturn(!HMIsEnabled(pVM), VERR_SELM_HM_IPE);
1442
1443	/*
1444	* GDT sync
1445	*/
1446	int rc;
1447	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
1448	{
1449	rc = selmR3UpdateShadowGdt(pVM, pVCpu);
1450	if (RT_FAILURE(rc))
1451	return rc; /* We're toast, so forget the profiling. */
1452	AssertRCSuccess(rc);
1453	}
1454
1455	/*
1456	* TSS sync
1457	*/
1458	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1459	{
1460	rc = SELMR3SyncTSS(pVM, pVCpu);
1461	if (RT_FAILURE(rc))
1462	return rc;
1463	AssertRCSuccess(rc);
1464	}
1465
1466	/*
1467	* LDT sync
1468	*/
1469	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT))
1470	{
1471	rc = selmR3UpdateShadowLdt(pVM, pVCpu);
1472	if (RT_FAILURE(rc))
1473	return rc;
1474	AssertRCSuccess(rc);
1475	}
1476
1477	/*
1478	* Check selector registers.
1479	*/
1480	VBOXSTRICTRC rcStrict = selmR3UpdateSegmentRegisters(pVM, pVCpu);
1481
1482	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1483	return rcStrict;
1484	}
1485
1486
1487	/**
1488	* Synchronize the shadowed fields in the TSS.
1489	*
1490	* At present we're shadowing the ring-0 stack selector & pointer, and the
1491	* interrupt redirection bitmap (if present). We take the lazy approach wrt to
1492	* REM and this function is called both if REM made any changes to the TSS or
1493	* loaded TR.
1494	*
1495	* @returns VBox status code.
1496	* @param pVM The cross context VM structure.
1497	* @param pVCpu The cross context virtual CPU structure.
1498	*/
1499	VMMR3DECL(int) SELMR3SyncTSS(PVM pVM, PVMCPU pVCpu)
1500	{
1501	LogFlow(("SELMR3SyncTSS\n"));
1502	int rc;
1503	AssertReturnStmt(!HMIsEnabled(pVM), VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS), VINF_SUCCESS);
1504
1505	STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
1506	Assert(VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS));
1507
1508	/*
1509	* Get TR and extract and store the basic info.
1510	*
1511	* Note! The TSS limit is not checked by the LTR code, so we
1512	* have to be a bit careful with it. We make sure cbTss
1513	* won't be zero if TR is valid and if it's NULL we'll
1514	* make sure cbTss is 0.
1515	*/
1516	/** @todo use the hidden bits, not shadow GDT. */
1517	CPUMSELREGHID trHid;
1518	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1519	RTGCPTR GCPtrTss = trHid.u64Base;
1520	uint32_t cbTss = trHid.u32Limit;
1521	Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
1522	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1523	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1524	if (SelTss & X86_SEL_MASK_OFF_RPL)
1525	{
1526	Assert(!(SelTss & X86_SEL_LDT));
1527	Assert(trHid.Attr.n.u1DescType == 0);
1528	Assert( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1529	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY);
1530	if (!++cbTss)
1531	cbTss = UINT32_MAX;
1532	}
1533	else
1534	{
1535	Assert( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1536	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1537	cbTss = 0; /* the reset case. */
1538	}
1539	pVM->selm.s.cbGuestTss = cbTss;
1540	pVM->selm.s.fGuestTss32Bit = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1541	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1542
1543	/*
1544	* Figure out the size of what need to monitor.
1545	*/
1546	/* We're not interested in any 16-bit TSSes. */
1547	uint32_t cbMonitoredTss = cbTss;
1548	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1549	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1550	cbMonitoredTss = 0;
1551
1552	pVM->selm.s.offGuestIoBitmap = 0;
1553	bool fNoRing1Stack = true;
1554	if (cbMonitoredTss)
1555	{
1556	/*
1557	* 32-bit TSS. What we're really keen on is the SS0 and ESP0 fields.
1558	* If VME is enabled we also want to keep an eye on the interrupt
1559	* redirection bitmap.
1560	*/
1561	VBOXTSS Tss;
1562	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1563	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1564	if ( !(cr4 & X86_CR4_VME)
1565	\|\| ( RT_SUCCESS(rc)
1566	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1567	&& Tss.offIoBitmap > cbTss) /* beyond the end / /* @todo not sure how the partial case is handled; probably not allowed. */
1568	)
1569	/* No interrupt redirection bitmap, just ESP0 and SS0. */
1570	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1571	else if (RT_SUCCESS(rc))
1572	{
1573	/*
1574	* Everything up to and including the interrupt redirection bitmap. Unfortunately
1575	* this can be quite a large chunk. We use to skip it earlier and just hope it
1576	* was kind of static...
1577	*
1578	* Update the virtual interrupt redirection bitmap while we're here.
1579	* (It is located in the 32 bytes before TR:offIoBitmap.)
1580	*/
1581	cbMonitoredTss = Tss.offIoBitmap;
1582	pVM->selm.s.offGuestIoBitmap = Tss.offIoBitmap;
1583
1584	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1585	rc = PGMPhysSimpleReadGCPtr(pVCpu, &pVM->selm.s.Tss.IntRedirBitmap,
1586	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1587	AssertRC(rc);
1588	/** @todo memset the bitmap on failure? */
1589	Log2(("Redirection bitmap:\n"));
1590	Log2(("%.*Rhxd\n", sizeof(Tss.IntRedirBitmap), &pVM->selm.s.Tss.IntRedirBitmap));
1591	}
1592	else
1593	{
1594	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1595	pVM->selm.s.offGuestIoBitmap = 0;
1596	/** @todo memset the bitmap? */
1597	}
1598
1599	/*
1600	* Update the ring 0 stack selector and base address.
1601	*/
1602	if (RT_SUCCESS(rc))
1603	{
1604	# ifdef LOG_ENABLED
1605	if (LogIsEnabled())
1606	{
1607	uint32_t ssr0, espr0;
1608	SELMGetRing1Stack(pVM, &ssr0, &espr0);
1609	if ((ssr0 & ~1) != Tss.ss0 \|\| espr0 != Tss.esp0)
1610	{
1611	RTGCPHYS GCPhys = NIL_RTGCPHYS;
1612	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1613	Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1614	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1615	AssertMsg(ssr0 != Tss.ss0,
1616	("ring-1 leak into TSS.SS0! %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1617	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1618	}
1619	Log(("offIoBitmap=%#x\n", Tss.offIoBitmap));
1620	}
1621	# endif /* LOG_ENABLED */
1622	AssertMsg(!(Tss.ss0 & 3), ("ring-1 leak into TSS.SS0? %04X:%08X\n", Tss.ss0, Tss.esp0));
1623
1624	/* Update our TSS structure for the guest's ring 1 stack */
1625	selmSetRing1Stack(pVM, Tss.ss0 \| 1, Tss.esp0);
1626	pVM->selm.s.fSyncTSSRing0Stack = fNoRing1Stack = false;
1627
1628	# ifdef VBOX_WITH_RAW_RING1
1629	/* Update our TSS structure for the guest's ring 2 stack */
1630	if (EMIsRawRing1Enabled(pVM))
1631	{
1632	if ( (pVM->selm.s.Tss.ss2 != ((Tss.ss1 & ~2) \| 1))
1633	\|\| pVM->selm.s.Tss.esp2 != Tss.esp1)
1634	Log(("SELMR3SyncTSS: Updating TSS ring 1 stack to %04X:%08X from %04X:%08X\n", Tss.ss1, Tss.esp1, (pVM->selm.s.Tss.ss2 & ~2) \| 1, pVM->selm.s.Tss.esp2));
1635	selmSetRing2Stack(pVM, (Tss.ss1 & ~1) \| 2, Tss.esp1);
1636	}
1637	# endif
1638	}
1639	}
1640
1641	/*
1642	* Flush the ring-1 stack and the direct syscall dispatching if we
1643	* cannot obtain SS0:ESP0.
1644	*/
1645	if (fNoRing1Stack)
1646	{
1647	selmSetRing1Stack(pVM, 0 /* invalid SS */, 0);
1648	pVM->selm.s.fSyncTSSRing0Stack = cbMonitoredTss != 0;
1649
1650	/** @todo handle these dependencies better! */
1651	TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
1652	TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
1653	}
1654
1655	/*
1656	* Check for monitor changes and apply them.
1657	*/
1658	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1659	\|\| cbMonitoredTss != pVM->selm.s.cbMonitoredGuestTss)
1660	{
1661	Log(("SELMR3SyncTSS: Guest's TSS is changed to pTss=%RGv cbMonitoredTss=%08X cbGuestTss=%#08x\n",
1662	GCPtrTss, cbMonitoredTss, pVM->selm.s.cbGuestTss));
1663
1664	/* Release the old range first. */
1665	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
1666	{
1667	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestTss, false /fHypervisor/);
1668	AssertRC(rc);
1669	}
1670
1671	/* Register the write handler if TS != 0. */
1672	if (cbMonitoredTss != 0)
1673	{
1674	# ifdef SELM_TRACK_GUEST_TSS_CHANGES
1675	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestTssWriteHandlerType,
1676	GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1677	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1678	if (RT_FAILURE(rc))
1679	{
1680	# ifdef VBOX_WITH_RAW_RING1
1681	/** @todo !HACK ALERT!
1682	* Some guest OSes (QNX) share code and the TSS on the same page;
1683	* PGMR3HandlerVirtualRegister doesn't support more than one
1684	* handler, so we kick out the PATM handler as this one is more
1685	* important. Fix this properly in PGMR3HandlerVirtualRegister?
1686	*/
1687	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1688	{
1689	LogRel(("SELMR3SyncTSS: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority TSS page monitor\n", GCPtrTss));
1690	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, GCPtrTss & PAGE_BASE_GC_MASK, false /fHypervisor/);
1691	AssertRC(rc);
1692
1693	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestTssWriteHandlerType,
1694	GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1695	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1696	if (RT_FAILURE(rc))
1697	{
1698	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1699	return rc;
1700	}
1701	}
1702	# else
1703	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1704	return rc;
1705	# endif
1706	}
1707	# endif /* SELM_TRACK_GUEST_TSS_CHANGES */
1708
1709	/* Update saved Guest TSS info. */
1710	pVM->selm.s.GCPtrGuestTss = GCPtrTss;
1711	pVM->selm.s.cbMonitoredGuestTss = cbMonitoredTss;
1712	pVM->selm.s.GCSelTss = SelTss;
1713	}
1714	else
1715	{
1716	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
1717	pVM->selm.s.cbMonitoredGuestTss = 0;
1718	pVM->selm.s.GCSelTss = 0;
1719	}
1720	}
1721
1722	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1723
1724	STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
1725	return VINF_SUCCESS;
1726	}
1727
1728
1729	/**
1730	* Compares the Guest GDT and LDT with the shadow tables.
1731	* This is a VBOX_STRICT only function.
1732	*
1733	* @returns VBox status code.
1734	* @param pVM The cross context VM structure.
1735	*/
1736	VMMR3DECL(int) SELMR3DebugCheck(PVM pVM)
1737	{
1738	# ifdef VBOX_STRICT
1739	PVMCPU pVCpu = VMMGetCpu(pVM);
1740	AssertReturn(!HMIsEnabled(pVM), VERR_SELM_HM_IPE);
1741
1742	/*
1743	* Get GDTR and check for conflict.
1744	*/
1745	VBOXGDTR GDTR;
1746	CPUMGetGuestGDTR(pVCpu, &GDTR);
1747	if (GDTR.cbGdt == 0)
1748	return VINF_SUCCESS;
1749
1750	if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
1751	Log(("SELMR3DebugCheck: guest GDT size forced us to look for unused selectors.\n"));
1752
1753	if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1754	Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
1755
1756	/*
1757	* Loop thru the GDT checking each entry.
1758	*/
1759	RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
1760	PX86DESC pGDTE = pVM->selm.s.paGdtR3;
1761	PX86DESC pGDTEEnd = (PX86DESC)((uintptr_t)pGDTE + GDTR.cbGdt);
1762	while (pGDTE < pGDTEEnd)
1763	{
1764	X86DESC GDTEGuest;
1765	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
1766	if (RT_SUCCESS(rc))
1767	{
1768	if (pGDTE->Gen.u1DescType \|\| pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1769	{
1770	if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
1771	\|\| pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
1772	\|\| pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
1773	\|\| pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
1774	\|\| pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
1775	\|\| pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
1776	\|\| pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
1777	{
1778	unsigned iGDT = pGDTE - pVM->selm.s.paGdtR3;
1779	SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
1780	SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
1781	}
1782	}
1783	}
1784
1785	/* Advance to the next descriptor. */
1786	GCPtrGDTEGuest += sizeof(X86DESC);
1787	pGDTE++;
1788	}
1789
1790
1791	/*
1792	* LDT?
1793	*/
1794	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1795	if ((SelLdt & X86_SEL_MASK_OFF_RPL) == 0)
1796	return VINF_SUCCESS;
1797	Assert(!(SelLdt & X86_SEL_LDT));
1798	if (SelLdt > GDTR.cbGdt)
1799	{
1800	Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
1801	return VERR_SELM_LDT_OUT_OF_BOUNDS;
1802	}
1803	X86DESC LDTDesc;
1804	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
1805	if (RT_FAILURE(rc))
1806	{
1807	Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
1808	return rc;
1809	}
1810	RTGCPTR GCPtrLDTEGuest = X86DESC_BASE(&LDTDesc);
1811	uint32_t cbLdt = X86DESC_LIMIT_G(&LDTDesc);
1812
1813	/*
1814	* Validate it.
1815	*/
1816	if (!cbLdt)
1817	return VINF_SUCCESS;
1818	/** @todo check what intel does about odd limits. */
1819	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1820	if ( LDTDesc.Gen.u1DescType
1821	\|\| LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
1822	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
1823	{
1824	Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
1825	return VERR_SELM_INVALID_LDT;
1826	}
1827
1828	/*
1829	* Loop thru the LDT checking each entry.
1830	*/
1831	unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
1832	PX86DESC pLDTE = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1833	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pGDTE + cbLdt);
1834	while (pLDTE < pLDTEEnd)
1835	{
1836	X86DESC LDTEGuest;
1837	rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
1838	if (RT_SUCCESS(rc))
1839	{
1840	if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
1841	\|\| pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
1842	\|\| pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
1843	\|\| pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
1844	\|\| pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
1845	\|\| pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
1846	\|\| pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
1847	{
1848	unsigned iLDT = pLDTE - (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1849	SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
1850	SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
1851	}
1852	}
1853
1854	/* Advance to the next descriptor. */
1855	GCPtrLDTEGuest += sizeof(X86DESC);
1856	pLDTE++;
1857	}
1858
1859	# else /* !VBOX_STRICT */
1860	NOREF(pVM);
1861	# endif /* !VBOX_STRICT */
1862
1863	return VINF_SUCCESS;
1864	}
1865
1866
1867	/**
1868	* Validates the RawR0 TSS values against the one in the Guest TSS.
1869	*
1870	* @returns true if it matches.
1871	* @returns false and assertions on mismatch..
1872	* @param pVM The cross context VM structure.
1873	*/
1874	VMMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
1875	{
1876	# if defined(VBOX_STRICT) && defined(SELM_TRACK_GUEST_TSS_CHANGES)
1877	PVMCPU pVCpu = VMMGetCpu(pVM);
1878
1879	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1880	return true;
1881
1882	/*
1883	* Get TR and extract the basic info.
1884	*/
1885	CPUMSELREGHID trHid;
1886	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1887	RTGCPTR GCPtrTss = trHid.u64Base;
1888	uint32_t cbTss = trHid.u32Limit;
1889	Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
1890	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1891	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1892	if (SelTss & X86_SEL_MASK_OFF_RPL)
1893	{
1894	AssertReturn(!(SelTss & X86_SEL_LDT), false);
1895	AssertReturn(trHid.Attr.n.u1DescType == 0, false);
1896	AssertReturn( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1897	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY,
1898	false);
1899	if (!++cbTss)
1900	cbTss = UINT32_MAX;
1901	}
1902	else
1903	{
1904	AssertReturn( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1905	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */),
1906	false);
1907	cbTss = 0; /* the reset case. */
1908	}
1909	AssertMsgReturn(pVM->selm.s.cbGuestTss == cbTss, ("%#x %#x\n", pVM->selm.s.cbGuestTss, cbTss), false);
1910	AssertMsgReturn(pVM->selm.s.fGuestTss32Bit == ( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1911	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY),
1912	("%RTbool u4Type=%d\n", pVM->selm.s.fGuestTss32Bit, trHid.Attr.n.u4Type),
1913	false);
1914	AssertMsgReturn( pVM->selm.s.GCSelTss == SelTss
1915	\|\| (!pVM->selm.s.GCSelTss && !(SelTss & X86_SEL_LDT)),
1916	("%#x %#x\n", pVM->selm.s.GCSelTss, SelTss),
1917	false);
1918	AssertMsgReturn( pVM->selm.s.GCPtrGuestTss == GCPtrTss
1919	\|\| (pVM->selm.s.GCPtrGuestTss == RTRCPTR_MAX && !GCPtrTss),
1920	("%#RGv %#RGv\n", pVM->selm.s.GCPtrGuestTss, GCPtrTss),
1921	false);
1922
1923
1924	/*
1925	* Figure out the size of what need to monitor.
1926	*/
1927	/* We're not interested in any 16-bit TSSes. */
1928	uint32_t cbMonitoredTss = cbTss;
1929	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1930	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1931	cbMonitoredTss = 0;
1932	if (cbMonitoredTss)
1933	{
1934	VBOXTSS Tss;
1935	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1936	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1937	AssertReturn( rc == VINF_SUCCESS
1938	/* Happens early in XP boot during page table switching. */
1939	\|\| ( (rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT)
1940	&& !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF)),
1941	false);
1942	if ( !(cr4 & X86_CR4_VME)
1943	\|\| ( RT_SUCCESS(rc)
1944	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1945	&& Tss.offIoBitmap > cbTss)
1946	)
1947	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1948	else if (RT_SUCCESS(rc))
1949	{
1950	cbMonitoredTss = Tss.offIoBitmap;
1951	AssertMsgReturn(pVM->selm.s.offGuestIoBitmap == Tss.offIoBitmap,
1952	("%#x %#x\n", pVM->selm.s.offGuestIoBitmap, Tss.offIoBitmap),
1953	false);
1954
1955	/* check the bitmap */
1956	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1957	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss.IntRedirBitmap,
1958	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1959	AssertRCReturn(rc, false);
1960	AssertMsgReturn(!memcmp(&Tss.IntRedirBitmap[0], &pVM->selm.s.Tss.IntRedirBitmap[0], sizeof(Tss.IntRedirBitmap)),
1961	("offIoBitmap=%#x cbTss=%#x\n"
1962	" Guest: %.32Rhxs\n"
1963	"Shadow: %.32Rhxs\n",
1964	Tss.offIoBitmap, cbTss,
1965	&Tss.IntRedirBitmap[0],
1966	&pVM->selm.s.Tss.IntRedirBitmap[0]),
1967	false);
1968	}
1969	else
1970	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1971
1972	/*
1973	* Check SS0 and ESP0.
1974	*/
1975	if ( !pVM->selm.s.fSyncTSSRing0Stack
1976	&& RT_SUCCESS(rc))
1977	{
1978	if ( Tss.esp0 != pVM->selm.s.Tss.esp1
1979	\|\| Tss.ss0 != (pVM->selm.s.Tss.ss1 & ~1))
1980	{
1981	RTGCPHYS GCPhys;
1982	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1983	AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%RGv Phys=%RGp\n",
1984	(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1,
1985	Tss.ss1, Tss.esp1, GCPtrTss, GCPhys));
1986	return false;
1987	}
1988	}
1989	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1990	}
1991	else
1992	{
1993	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);
1994	AssertReturn(!pVM->selm.s.fSyncTSSRing0Stack, false);
1995	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1996	}
1997
1998
1999
2000	return true;
2001
2002	# else /* !VBOX_STRICT */
2003	NOREF(pVM);
2004	return true;
2005	# endif /* !VBOX_STRICT */
2006	}
2007
2008
2009	# ifdef VBOX_WITH_SAFE_STR
2010	/**
2011	* Validates the RawR0 TR shadow GDT entry.
2012	*
2013	* @returns true if it matches.
2014	* @returns false and assertions on mismatch..
2015	* @param pVM The cross context VM structure.
2016	*/
2017	VMMR3DECL(bool) SELMR3CheckShadowTR(PVM pVM)
2018	{
2019	# ifdef VBOX_STRICT
2020	PX86DESC paGdt = pVM->selm.s.paGdtR3;
2021
2022	/*
2023	* TSS descriptor
2024	*/
2025	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
2026	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
2027
2028	if ( pDesc->Gen.u16BaseLow != RT_LOWORD(RCPtrTSS)
2029	\|\| pDesc->Gen.u8BaseHigh1 != RT_BYTE3(RCPtrTSS)
2030	\|\| pDesc->Gen.u8BaseHigh2 != RT_BYTE4(RCPtrTSS)
2031	\|\| pDesc->Gen.u16LimitLow != sizeof(VBOXTSS) - 1
2032	\|\| pDesc->Gen.u4LimitHigh != 0
2033	\|\| (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL && pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
2034	\|\| pDesc->Gen.u1DescType != 0 /* system */
2035	\|\| pDesc->Gen.u2Dpl != 0 /* supervisor */
2036	\|\| pDesc->Gen.u1Present != 1
2037	\|\| pDesc->Gen.u1Available != 0
2038	\|\| pDesc->Gen.u1Long != 0
2039	\|\| pDesc->Gen.u1DefBig != 0
2040	\|\| pDesc->Gen.u1Granularity != 0 /* byte limit */
2041	)
2042	{
2043	AssertFailed();
2044	return false;
2045	}
2046	# else
2047	RT_NOREF_PV(pVM);
2048	# endif
2049	return true;
2050	}
2051	# endif /* VBOX_WITH_SAFE_STR */
2052
2053	#endif /* VBOX_WITH_RAW_MODE */
2054
2055	/**
2056	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2057	*
2058	* See SELMR3GetSelectorInfo for details.
2059	*
2060	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2061	*
2062	* @param pVCpu The cross context virtual CPU structure.
2063	* @param Sel The selector to get info about.
2064	* @param pSelInfo Where to store the information.
2065	*/
2066	static int selmR3GetSelectorInfo64(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2067	{
2068	/*
2069	* Read it from the guest descriptor table.
2070	*/
2071	/** @todo this is bogus wrt the LDT/GDT limit on long selectors. */
2072	X86DESC64 Desc;
2073	RTGCPTR GCPtrDesc;
2074	if (!(Sel & X86_SEL_LDT))
2075	{
2076	/* GDT */
2077	VBOXGDTR Gdtr;
2078	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2079	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
2080	return VERR_INVALID_SELECTOR;
2081	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2082	}
2083	else
2084	{
2085	/* LDT */
2086	uint64_t GCPtrBase;
2087	uint32_t cbLimit;
2088	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
2089	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
2090	return VERR_INVALID_SELECTOR;
2091
2092	/* calc the descriptor location. */
2093	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
2094	}
2095
2096	/* read the descriptor. */
2097	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2098	if (RT_FAILURE(rc))
2099	{
2100	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
2101	if (RT_FAILURE(rc))
2102	return rc;
2103	Desc.au64[1] = 0;
2104	}
2105
2106	/*
2107	* Extract the base and limit
2108	* (We ignore the present bit here, which is probably a bit silly...)
2109	*/
2110	pSelInfo->Sel = Sel;
2111	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
2112	pSelInfo->u.Raw64 = Desc;
2113	if (Desc.Gen.u1DescType)
2114	{
2115	/*
2116	* 64-bit code selectors are wide open, it's not possible to detect
2117	* 64-bit data or stack selectors without also dragging in assumptions
2118	* about current CS (i.e. that's we're executing in 64-bit mode). So,
2119	* the selinfo user needs to deal with this in the context the info is
2120	* used unfortunately.
2121	*/
2122	if ( Desc.Gen.u1Long
2123	&& !Desc.Gen.u1DefBig
2124	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
2125	{
2126	/* Note! We ignore the segment limit hacks that was added by AMD. */
2127	pSelInfo->GCPtrBase = 0;
2128	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
2129	}
2130	else
2131	{
2132	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
2133	pSelInfo->GCPtrBase = X86DESC_BASE(&Desc);
2134	}
2135	pSelInfo->SelGate = 0;
2136	}
2137	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
2138	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
2139	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
2140	{
2141	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
2142	in the AMD manual here as a simplification. */
2143	pSelInfo->GCPtrBase = X86DESC64_BASE(&Desc);
2144	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
2145	pSelInfo->SelGate = 0;
2146	}
2147	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
2148	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
2149	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
2150	{
2151	pSelInfo->cbLimit = X86DESC64_BASE(&Desc);
2152	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
2153	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
2154	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
2155	pSelInfo->SelGate = Desc.Gate.u16Sel;
2156	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2157	}
2158	else
2159	{
2160	pSelInfo->cbLimit = 0;
2161	pSelInfo->GCPtrBase = 0;
2162	pSelInfo->SelGate = 0;
2163	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2164	}
2165	if (!Desc.Gen.u1Present)
2166	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2167
2168	return VINF_SUCCESS;
2169	}
2170
2171
2172	/**
2173	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
2174	* interprets a legacy descriptor table entry and fills in the selector info
2175	* structure from it.
2176	*
2177	* @param pSelInfo Where to store the selector info. Only the fFlags and
2178	* Sel members have been initialized.
2179	* @param pDesc The legacy descriptor to parse.
2180	*/
2181	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
2182	{
2183	pSelInfo->u.Raw64.au64[1] = 0;
2184	pSelInfo->u.Raw = *pDesc;
2185	if ( pDesc->Gen.u1DescType
2186	\|\| !(pDesc->Gen.u4Type & 4))
2187	{
2188	pSelInfo->cbLimit = X86DESC_LIMIT_G(pDesc);
2189	pSelInfo->GCPtrBase = X86DESC_BASE(pDesc);
2190	pSelInfo->SelGate = 0;
2191	}
2192	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
2193	{
2194	pSelInfo->cbLimit = 0;
2195	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
2196	pSelInfo->GCPtrBase = 0;
2197	else
2198	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
2199	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
2200	pSelInfo->SelGate = pDesc->Gate.u16Sel;
2201	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2202	}
2203	else
2204	{
2205	pSelInfo->cbLimit = 0;
2206	pSelInfo->GCPtrBase = 0;
2207	pSelInfo->SelGate = 0;
2208	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2209	}
2210	if (!pDesc->Gen.u1Present)
2211	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2212	}
2213
2214
2215	/**
2216	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2217	*
2218	* See SELMR3GetSelectorInfo for details.
2219	*
2220	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2221	*
2222	* @param pVM The cross context VM structure.
2223	* @param pVCpu The cross context virtual CPU structure.
2224	* @param Sel The selector to get info about.
2225	* @param pSelInfo Where to store the information.
2226	*/
2227	static int selmR3GetSelectorInfo32(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2228	{
2229	/*
2230	* Read the descriptor entry
2231	*/
2232	pSelInfo->fFlags = 0;
2233	X86DESC Desc;
2234	if ( !(Sel & X86_SEL_LDT)
2235	&& ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_RPL_LDT)
2236	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_RPL_LDT)
2237	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_RPL_LDT)
2238	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_RPL_LDT)
2239	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_RPL_LDT))
2240	)
2241	{
2242	/*
2243	* Hypervisor descriptor.
2244	*/
2245	pSelInfo->fFlags = DBGFSELINFO_FLAGS_HYPER;
2246	if (CPUMIsGuestInProtectedMode(pVCpu))
2247	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2248	else
2249	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2250
2251	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2252	}
2253	else if (CPUMIsGuestInProtectedMode(pVCpu))
2254	{
2255	/*
2256	* Read it from the guest descriptor table.
2257	*/
2258	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
2259
2260	RTGCPTR GCPtrDesc;
2261	if (!(Sel & X86_SEL_LDT))
2262	{
2263	/* GDT */
2264	VBOXGDTR Gdtr;
2265	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2266	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
2267	return VERR_INVALID_SELECTOR;
2268	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2269	}
2270	else
2271	{
2272	/* LDT */
2273	uint64_t GCPtrBase;
2274	uint32_t cbLimit;
2275	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
2276	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
2277	return VERR_INVALID_SELECTOR;
2278
2279	/* calc the descriptor location. */
2280	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
2281	}
2282
2283	/* read the descriptor. */
2284	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2285	if (RT_FAILURE(rc))
2286	return rc;
2287	}
2288	else
2289	{
2290	/*
2291	* We're in real mode.
2292	*/
2293	pSelInfo->Sel = Sel;
2294	pSelInfo->GCPtrBase = Sel << 4;
2295	pSelInfo->cbLimit = 0xffff;
2296	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
2297	pSelInfo->u.Raw64.au64[0] = 0;
2298	pSelInfo->u.Raw64.au64[1] = 0;
2299	pSelInfo->SelGate = 0;
2300	return VINF_SUCCESS;
2301	}
2302
2303	/*
2304	* Extract the base and limit or sel:offset for gates.
2305	*/
2306	pSelInfo->Sel = Sel;
2307	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2308
2309	return VINF_SUCCESS;
2310	}
2311
2312
2313	/**
2314	* Gets information about a selector.
2315	*
2316	* Intended for the debugger mostly and will prefer the guest descriptor tables
2317	* over the shadow ones.
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 The cross context VM structure.
2330	* @param pVCpu The cross context virtual CPU structure.
2331	* @param Sel The selector to get info about.
2332	* @param pSelInfo Where to store the information.
2333	*/
2334	VMMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2335	{
2336	AssertPtr(pSelInfo);
2337	if (CPUMIsGuestInLongMode(pVCpu))
2338	return selmR3GetSelectorInfo64(pVCpu, Sel, pSelInfo);
2339	return selmR3GetSelectorInfo32(pVM, pVCpu, Sel, pSelInfo);
2340	}
2341
2342
2343	/**
2344	* Gets information about a selector from the shadow tables.
2345	*
2346	* This is intended to be faster than the SELMR3GetSelectorInfo() method, but
2347	* requires that the caller ensures that the shadow tables are up to date.
2348	*
2349	* @retval VINF_SUCCESS on success.
2350	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2351	* descriptor table.
2352	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2353	* is not returned if the selector itself isn't present, you have to
2354	* check that for yourself (see DBGFSELINFO::fFlags).
2355	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2356	* pagetable or page backing the selector table wasn't present.
2357	* @returns Other VBox status code on other errors.
2358	*
2359	* @param pVM The cross context VM structure.
2360	* @param Sel The selector to get info about.
2361	* @param pSelInfo Where to store the information.
2362	*
2363	* @remarks Don't use this when in hardware assisted virtualization mode.
2364	*/
2365	VMMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PDBGFSELINFO pSelInfo)
2366	{
2367	Assert(pSelInfo);
2368
2369	/*
2370	* Read the descriptor entry
2371	*/
2372	X86DESC Desc;
2373	if (!(Sel & X86_SEL_LDT))
2374	{
2375	/*
2376	* Global descriptor.
2377	*/
2378	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2379	pSelInfo->fFlags = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK_OFF_RPL)
2380	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK_OFF_RPL)
2381	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK_OFF_RPL)
2382	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK_OFF_RPL)
2383	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK_OFF_RPL)
2384	? DBGFSELINFO_FLAGS_HYPER
2385	: 0;
2386	/** @todo check that the GDT offset is valid. */
2387	}
2388	else
2389	{
2390	/*
2391	* Local Descriptor.
2392	*/
2393	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2394	Desc = paLDT[Sel >> X86_SEL_SHIFT];
2395	/** @todo check if the LDT page is actually available. */
2396	/** @todo check that the LDT offset is valid. */
2397	pSelInfo->fFlags = 0;
2398	}
2399	if (CPUMIsGuestInProtectedMode(VMMGetCpu0(pVM)))
2400	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2401	else
2402	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2403
2404	/*
2405	* Extract the base and limit or sel:offset for gates.
2406	*/
2407	pSelInfo->Sel = Sel;
2408	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2409
2410	return VINF_SUCCESS;
2411	}
2412
2413
2414	/**
2415	* Formats a descriptor.
2416	*
2417	* @param Desc Descriptor to format.
2418	* @param Sel Selector number.
2419	* @param pszOutput Output buffer.
2420	* @param cchOutput Size of output buffer.
2421	*/
2422	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
2423	{
2424	/*
2425	* Make variable description string.
2426	*/
2427	static struct
2428	{
2429	unsigned cch;
2430	const char *psz;
2431	} const aTypes[32] =
2432	{
2433	#define STRENTRY(str) { sizeof(str) - 1, str }
2434	/* system */
2435	STRENTRY("Reserved0 "), /* 0x00 */
2436	STRENTRY("TSS16Avail "), /* 0x01 */
2437	STRENTRY("LDT "), /* 0x02 */
2438	STRENTRY("TSS16Busy "), /* 0x03 */
2439	STRENTRY("Call16 "), /* 0x04 */
2440	STRENTRY("Task "), /* 0x05 */
2441	STRENTRY("Int16 "), /* 0x06 */
2442	STRENTRY("Trap16 "), /* 0x07 */
2443	STRENTRY("Reserved8 "), /* 0x08 */
2444	STRENTRY("TSS32Avail "), /* 0x09 */
2445	STRENTRY("ReservedA "), /* 0x0a */
2446	STRENTRY("TSS32Busy "), /* 0x0b */
2447	STRENTRY("Call32 "), /* 0x0c */
2448	STRENTRY("ReservedD "), /* 0x0d */
2449	STRENTRY("Int32 "), /* 0x0e */
2450	STRENTRY("Trap32 "), /* 0x0f */
2451	/* non system */
2452	STRENTRY("DataRO "), /* 0x10 */
2453	STRENTRY("DataRO Accessed "), /* 0x11 */
2454	STRENTRY("DataRW "), /* 0x12 */
2455	STRENTRY("DataRW Accessed "), /* 0x13 */
2456	STRENTRY("DataDownRO "), /* 0x14 */
2457	STRENTRY("DataDownRO Accessed "), /* 0x15 */
2458	STRENTRY("DataDownRW "), /* 0x16 */
2459	STRENTRY("DataDownRW Accessed "), /* 0x17 */
2460	STRENTRY("CodeEO "), /* 0x18 */
2461	STRENTRY("CodeEO Accessed "), /* 0x19 */
2462	STRENTRY("CodeER "), /* 0x1a */
2463	STRENTRY("CodeER Accessed "), /* 0x1b */
2464	STRENTRY("CodeConfEO "), /* 0x1c */
2465	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
2466	STRENTRY("CodeConfER "), /* 0x1e */
2467	STRENTRY("CodeConfER Accessed ") /* 0x1f */
2468	#undef SYSENTRY
2469	};
2470	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
2471	char szMsg[128];
2472	char *psz = &szMsg[0];
2473	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
2474	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
2475	psz += aTypes[i].cch;
2476
2477	if (Desc.Gen.u1Present)
2478	ADD_STR(psz, "Present ");
2479	else
2480	ADD_STR(psz, "Not-Present ");
2481	if (Desc.Gen.u1Granularity)
2482	ADD_STR(psz, "Page ");
2483	if (Desc.Gen.u1DefBig)
2484	ADD_STR(psz, "32-bit ");
2485	else
2486	ADD_STR(psz, "16-bit ");
2487	#undef ADD_STR
2488	*psz = '\0';
2489
2490	/*
2491	* Limit and Base and format the output.
2492	*/
2493	uint32_t u32Limit = X86DESC_LIMIT_G(&Desc);
2494	uint32_t u32Base = X86DESC_BASE(&Desc);
2495
2496	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
2497	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
2498	}
2499
2500
2501	/**
2502	* Dumps a descriptor.
2503	*
2504	* @param Desc Descriptor to dump.
2505	* @param Sel Selector number.
2506	* @param pszMsg Message to prepend the log entry with.
2507	*/
2508	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
2509	{
2510	#ifdef LOG_ENABLED
2511	if (LogIsEnabled())
2512	{
2513	char szOutput[128];
2514	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
2515	Log(("%s: %s\n", pszMsg, szOutput));
2516	}
2517	#else
2518	RT_NOREF3(Desc, Sel, pszMsg);
2519	#endif
2520	}
2521
2522
2523	/**
2524	* Display the shadow gdt.
2525	*
2526	* @param pVM The cross context VM structure.
2527	* @param pHlp The info helpers.
2528	* @param pszArgs Arguments, ignored.
2529	*/
2530	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2531	{
2532	NOREF(pszArgs);
2533	pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%RRv):\n", MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3));
2534	for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
2535	{
2536	if (pVM->selm.s.paGdtR3[iGDT].Gen.u1Present)
2537	{
2538	char szOutput[128];
2539	selmR3FormatDescriptor(pVM->selm.s.paGdtR3[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2540	const char *psz = "";
2541	if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> X86_SEL_SHIFT))
2542	psz = " HyperCS";
2543	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> X86_SEL_SHIFT))
2544	psz = " HyperDS";
2545	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> X86_SEL_SHIFT))
2546	psz = " HyperCS64";
2547	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> X86_SEL_SHIFT))
2548	psz = " HyperTSS";
2549	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
2550	psz = " HyperTSSTrap08";
2551	pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
2552	}
2553	}
2554	}
2555
2556
2557	/**
2558	* Display the guest gdt.
2559	*
2560	* @param pVM The cross context VM structure.
2561	* @param pHlp The info helpers.
2562	* @param pszArgs Arguments, ignored.
2563	*/
2564	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2565	{
2566	/** @todo SMP support! */
2567	PVMCPU pVCpu = &pVM->aCpus[0];
2568
2569	VBOXGDTR GDTR;
2570	CPUMGetGuestGDTR(pVCpu, &GDTR);
2571	RTGCPTR GCPtrGDT = GDTR.pGdt;
2572	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
2573
2574	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
2575	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
2576	{
2577	X86DESC GDTE;
2578	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
2579	if (RT_SUCCESS(rc))
2580	{
2581	if (GDTE.Gen.u1Present)
2582	{
2583	char szOutput[128];
2584	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2585	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2586	}
2587	}
2588	else if (rc == VERR_PAGE_NOT_PRESENT)
2589	{
2590	if ((GCPtrGDT & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2591	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
2592	}
2593	else
2594	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
2595	}
2596	NOREF(pszArgs);
2597	}
2598
2599
2600	/**
2601	* Display the shadow ldt.
2602	*
2603	* @param pVM The cross context VM structure.
2604	* @param pHlp The info helpers.
2605	* @param pszArgs Arguments, ignored.
2606	*/
2607	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2608	{
2609	unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
2610	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2611	pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%RRv limit=%#x):\n", pVM->selm.s.pvLdtRC + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
2612	for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
2613	{
2614	if (paLDT[iLDT].Gen.u1Present)
2615	{
2616	char szOutput[128];
2617	selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2618	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2619	}
2620	}
2621	NOREF(pszArgs);
2622	}
2623
2624
2625	/**
2626	* Display the guest ldt.
2627	*
2628	* @param pVM The cross context VM structure.
2629	* @param pHlp The info helpers.
2630	* @param pszArgs Arguments, ignored.
2631	*/
2632	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2633	{
2634	/** @todo SMP support! */
2635	PVMCPU pVCpu = &pVM->aCpus[0];
2636
2637	uint64_t GCPtrLdt;
2638	uint32_t cbLdt;
2639	RTSEL SelLdt = CPUMGetGuestLdtrEx(pVCpu, &GCPtrLdt, &cbLdt);
2640	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
2641	{
2642	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
2643	return;
2644	}
2645
2646	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RX64 limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
2647	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
2648	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
2649	{
2650	X86DESC LdtE;
2651	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
2652	if (RT_SUCCESS(rc))
2653	{
2654	if (LdtE.Gen.u1Present)
2655	{
2656	char szOutput[128];
2657	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2658	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2659	}
2660	}
2661	else if (rc == VERR_PAGE_NOT_PRESENT)
2662	{
2663	if ((GCPtrLdt & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2664	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
2665	}
2666	else
2667	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
2668	}
2669	NOREF(pszArgs);
2670	}
2671
2672
2673	/**
2674	* Dumps the hypervisor GDT
2675	*
2676	* @param pVM The cross context VM structure.
2677	*/
2678	VMMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
2679	{
2680	DBGFR3Info(pVM->pUVM, "gdt", NULL, NULL);
2681	}
2682
2683
2684	/**
2685	* Dumps the hypervisor LDT
2686	*
2687	* @param pVM The cross context VM structure.
2688	*/
2689	VMMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
2690	{
2691	DBGFR3Info(pVM->pUVM, "ldt", NULL, NULL);
2692	}
2693
2694
2695	/**
2696	* Dumps the guest GDT
2697	*
2698	* @param pVM The cross context VM structure.
2699	*/
2700	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
2701	{
2702	DBGFR3Info(pVM->pUVM, "gdtguest", NULL, NULL);
2703	}
2704
2705
2706	/**
2707	* Dumps the guest LDT
2708	*
2709	* @param pVM The cross context VM structure.
2710	*/
2711	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
2712	{
2713	DBGFR3Info(pVM->pUVM, "ldtguest", NULL, NULL);
2714	}
2715

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source: vbox/trunk/src/VBox/VMM/VMMR3/SELM.cpp@ 66651

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