SELM.cpp@ 56085

Last change on this file since 56085 was 56052, checked in by vboxsync, 10 years ago
VMM: Added non-PF raw-mode context virtual page access handler callback (not yet called).
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File size: 105.7 KB

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1	/* $Id: SELM.cpp 56052 2015-05-24 14:56:38Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_selm SELM - The Selector Manager
19	*
20	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
21	* of a few hyper selector for the raw-mode context. In the hardware assisted
22	* virtualization mode its only task is to decode entries in the guest GDT or
23	* LDT once in a while.
24	*
25	* @see grp_selm
26	*
27	*
28	* @section seg_selm_shadowing Shadowing
29	*
30	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
31	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
32	* The idea is to do it in a more on-demand fashion when we get time. There
33	* also a whole bunch of issues with the current synchronization of all three
34	* tables, see notes and todos in the code.
35	*
36	* When the guest makes changes to the GDT we will try update the shadow copy
37	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
38	*
39	* When the guest make LDT changes we'll trigger a full resync of the LDT
40	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
41	*
42	* The TSS shadowing is limited to the fields we need to care about, namely SS0
43	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
44	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
45	* rather than go the SELMR3SyncTSS() route.
46	*
47	* When in raw-mode SELM also injects a few extra GDT selectors which are used
48	* by the raw-mode (hyper) context. These start their life at the high end of
49	* the table and will be relocated when the guest tries to make use of them...
50	* Well, that was that idea at least, only the code isn't quite there yet which
51	* is why we have trouble with guests which actually have a full sized GDT.
52	*
53	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
54	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
55	*
56	*/
57
58	/*******************************************************************************
59	* Header Files *
60	*******************************************************************************/
61	#define LOG_GROUP LOG_GROUP_SELM
62	#include <VBox/vmm/selm.h>
63	#include <VBox/vmm/cpum.h>
64	#include <VBox/vmm/stam.h>
65	#include <VBox/vmm/em.h>
66	#include <VBox/vmm/hm.h>
67	#include <VBox/vmm/mm.h>
68	#include <VBox/vmm/ssm.h>
69	#include <VBox/vmm/pgm.h>
70	#include <VBox/vmm/trpm.h>
71	#include <VBox/vmm/dbgf.h>
72	#include "SELMInternal.h"
73	#include <VBox/vmm/vm.h>
74	#include <VBox/err.h>
75	#include <VBox/param.h>
76
77	#include <iprt/assert.h>
78	#include <VBox/log.h>
79	#include <iprt/asm.h>
80	#include <iprt/string.h>
81	#include <iprt/thread.h>
82	#include <iprt/string.h>
83
84	#include "SELMInline.h"
85
86
87	/** SELM saved state version. */
88	#define SELM_SAVED_STATE_VERSION 5
89
90
91	/*******************************************************************************
92	* Internal Functions *
93	*******************************************************************************/
94	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
95	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
96	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
97	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
98	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
99	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
100	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
101	//static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
102	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
103
104
105	/*******************************************************************************
106	* Global Variables *
107	*******************************************************************************/
108	#ifdef LOG_ENABLED
109	/** Segment register names. */
110	static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
111	#endif
112
113
114	/**
115	* Initializes the SELM.
116	*
117	* @returns VBox status code.
118	* @param pVM Pointer to the VM.
119	*/
120	VMMR3DECL(int) SELMR3Init(PVM pVM)
121	{
122	int rc;
123	LogFlow(("SELMR3Init\n"));
124
125	/*
126	* Assert alignment and sizes.
127	* (The TSS block requires contiguous back.)
128	*/
129	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
130	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
131	#if 0 /* doesn't work */
132	AssertCompile((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
133	AssertCompile((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
134	#endif
135	AssertRelease((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
136	AssertRelease((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
137	AssertRelease(sizeof(pVM->selm.s.Tss.IntRedirBitmap) == 0x20);
138
139	/*
140	* Init the structure.
141	*/
142	pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
143	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = (SELM_GDT_ELEMENTS - 0x1) << 3;
144	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = (SELM_GDT_ELEMENTS - 0x2) << 3;
145	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = (SELM_GDT_ELEMENTS - 0x3) << 3;
146	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = (SELM_GDT_ELEMENTS - 0x4) << 3;
147	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = (SELM_GDT_ELEMENTS - 0x5) << 3;
148
149	if (HMIsRawModeCtxNeeded(pVM))
150	{
151	/*
152	* Allocate GDT table.
153	*/
154	rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtR3[0]) * SELM_GDT_ELEMENTS,
155	PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtR3);
156	AssertRCReturn(rc, rc);
157
158	/*
159	* Allocate LDT area.
160	*/
161	rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.pvLdtR3);
162	AssertRCReturn(rc, rc);
163	}
164
165	/*
166	* Init Guest's and Shadow GDT, LDT, TSS changes control variables.
167	*/
168	pVM->selm.s.cbEffGuestGdtLimit = 0;
169	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
170	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
171	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
172
173	pVM->selm.s.paGdtRC = NIL_RTRCPTR; /* Must be set in SELMR3Relocate because of monitoring. */
174	pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
175	pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
176	pVM->selm.s.GCSelTss = RTSEL_MAX;
177
178	pVM->selm.s.fSyncTSSRing0Stack = false;
179
180	/* The I/O bitmap starts right after the virtual interrupt redirection
181	bitmap. Outside the TSS on purpose; the CPU will not check it for
182	I/O operations. */
183	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
184	/* bit set to 1 means no redirection */
185	memset(pVM->selm.s.Tss.IntRedirBitmap, 0xff, sizeof(pVM->selm.s.Tss.IntRedirBitmap));
186
187	/*
188	* Register the virtual access handlers.
189	*/
190	pVM->selm.s.hShadowGdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
191	pVM->selm.s.hShadowLdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
192	pVM->selm.s.hShadowTssWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
193	pVM->selm.s.hGuestGdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
194	pVM->selm.s.hGuestLdtWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
195	pVM->selm.s.hGuestTssWriteHandlerType = NIL_PGMVIRTHANDLERTYPE;
196	#ifdef VBOX_WITH_RAW_MODE
197	if (!HMIsEnabled(pVM))
198	{
199	# ifdef SELM_TRACK_SHADOW_GDT_CHANGES
200	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
201	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
202	NULL /pszHandlerRC/, "selmRCShadowGDTWritePfHandler",
203	"Shadow GDT write access handler", &pVM->selm.s.hShadowGdtWriteHandlerType);
204	AssertRCReturn(rc, rc);
205	# endif
206	# ifdef SELM_TRACK_SHADOW_TSS_CHANGES
207	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
208	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
209	NULL /pszHandlerRC/, "selmRCShadowTSSWritePfHandler",
210	"Shadow TSS write access handler", &pVM->selm.s.hShadowTssWriteHandlerType);
211	AssertRCReturn(rc, rc);
212	# endif
213	# ifdef SELM_TRACK_SHADOW_LDT_CHANGES
214	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_HYPERVISOR, false /fRelocUserRC/,
215	NULL /pfnInvalidateR3/, NULL /pfnHandlerR3/,
216	NULL /pszHandlerRC/, "selmRCShadowLDTWritePfHandler",
217	"Shadow LDT write access handler", &pVM->selm.s.hShadowLdtWriteHandlerType);
218	AssertRCReturn(rc, rc);
219	# endif
220	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
221	NULL /pfnInvalidateR3/, selmGuestGDTWriteHandler,
222	"selmGuestGDTWriteHandler", "selmRCGuestGDTWritePfHandler",
223	"Guest GDT write access handler", &pVM->selm.s.hGuestGdtWriteHandlerType);
224	AssertRCReturn(rc, rc);
225	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
226	NULL /pfnInvalidateR3/, selmGuestLDTWriteHandler,
227	"selmGuestLDTWriteHandler", "selmRCGuestLDTWritePfHandler",
228	"Guest LDT write access handler", &pVM->selm.s.hGuestLdtWriteHandlerType);
229	AssertRCReturn(rc, rc);
230	rc = PGMR3HandlerVirtualTypeRegister(pVM, PGMVIRTHANDLERKIND_WRITE, false /fRelocUserRC/,
231	NULL /pfnInvalidateR3/, selmGuestTSSWriteHandler,
232	"selmGuestTSSWriteHandler", "selmRCGuestTSSWritePfHandler",
233	"Guest TSS write access handler", &pVM->selm.s.hGuestTssWriteHandlerType);
234	AssertRCReturn(rc, rc);
235	}
236	#endif /* VBOX_WITH_RAW_MODE */
237
238	/*
239	* Register the saved state data unit.
240	*/
241	rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
242	NULL, NULL, NULL,
243	NULL, selmR3Save, NULL,
244	NULL, selmR3Load, selmR3LoadDone);
245	if (RT_FAILURE(rc))
246	return rc;
247
248	/*
249	* Statistics.
250	*/
251	if (!HMIsEnabled(pVM))
252	{
253	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.");
254	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.");
255	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.");
256	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.");
257	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.");
258	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.");
259	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.");
260	STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
261	STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
262
263	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.");
264	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.");
265
266	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleES", STAMUNIT_OCCURENCES, "Stale ES was detected in UpdateFromCPUM.");
267	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleCS", STAMUNIT_OCCURENCES, "Stale CS was detected in UpdateFromCPUM.");
268	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleSS", STAMUNIT_OCCURENCES, "Stale SS was detected in UpdateFromCPUM.");
269	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleDS", STAMUNIT_OCCURENCES, "Stale DS was detected in UpdateFromCPUM.");
270	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleFS", STAMUNIT_OCCURENCES, "Stale FS was detected in UpdateFromCPUM.");
271	STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleGS", STAMUNIT_OCCURENCES, "Stale GS was detected in UpdateFromCPUM.");
272
273	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleES", STAMUNIT_OCCURENCES, "Already stale ES in UpdateFromCPUM.");
274	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleCS", STAMUNIT_OCCURENCES, "Already stale CS in UpdateFromCPUM.");
275	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleSS", STAMUNIT_OCCURENCES, "Already stale SS in UpdateFromCPUM.");
276	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleDS", STAMUNIT_OCCURENCES, "Already stale DS in UpdateFromCPUM.");
277	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleFS", STAMUNIT_OCCURENCES, "Already stale FS in UpdateFromCPUM.");
278	STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleGS", STAMUNIT_OCCURENCES, "Already stale GS in UpdateFromCPUM.");
279
280	STAM_REL_REG(pVM, &pVM->selm.s.StatStaleToUnstaleSReg, STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/StaleToUnstale", STAMUNIT_OCCURENCES, "Transitions from stale to unstale UpdateFromCPUM.");
281
282	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedES", STAMUNIT_OCCURENCES, "Updated hidden ES values in UpdateFromCPUM.");
283	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedCS", STAMUNIT_OCCURENCES, "Updated hidden CS values in UpdateFromCPUM.");
284	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedSS", STAMUNIT_OCCURENCES, "Updated hidden SS values in UpdateFromCPUM.");
285	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedDS", STAMUNIT_OCCURENCES, "Updated hidden DS values in UpdateFromCPUM.");
286	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedFS", STAMUNIT_OCCURENCES, "Updated hidden FS values in UpdateFromCPUM.");
287	STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedGS", STAMUNIT_OCCURENCES, "Updated hidden GS values in UpdateFromCPUM.");
288	}
289
290	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelGst, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from guest tables.");
291	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelShw, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedShadow", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from shadow tables.");
292	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelReadErrors, STAMTYPE_COUNTER, "/SELM/LoadHidSel/GstReadErrors", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Guest table read errors.");
293	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelGstNoGood, STAMTYPE_COUNTER, "/SELM/LoadHidSel/NoGoodGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: No good guest table entry.");
294
295	#ifdef VBOX_WITH_RAW_MODE
296	/*
297	* Default action when entering raw mode for the first time
298	*/
299	if (!HMIsEnabled(pVM))
300	{
301	PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
302	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
303	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
304	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
305	}
306	#endif
307
308	/*
309	* Register info handlers.
310	*/
311	if (HMIsRawModeCtxNeeded(pVM))
312	{
313	DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
314	DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
315	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
316	}
317	DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
318	DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
319	//DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
320
321	return rc;
322	}
323
324
325	/**
326	* Finalizes HMA page attributes.
327	*
328	* @returns VBox status code.
329	* @param pVM Pointer to the VM.
330	*/
331	VMMR3DECL(int) SELMR3InitFinalize(PVM pVM)
332	{
333	#ifdef VBOX_WITH_RAW_MODE
334	/** @cfgm{/DoubleFault,bool,false}
335	* Enables catching of double faults in the raw-mode context VMM code. This can
336	* be used when the triple faults or hangs occur and one suspect an unhandled
337	* double fault. This is not enabled by default because it means making the
338	* hyper selectors writeable for all supervisor code, including the guest's.
339	* The double fault is a task switch and thus requires write access to the GDT
340	* of the TSS (to set it busy), to the old TSS (to store state), and to the Trap
341	* 8 TSS for the back link.
342	*/
343	bool f;
344	# if defined(DEBUG_bird)
345	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, true);
346	# else
347	int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, false);
348	# endif
349	AssertLogRelRCReturn(rc, rc);
350	if (f && HMIsRawModeCtxNeeded(pVM))
351	{
352	PX86DESC paGdt = pVM->selm.s.paGdtR3;
353	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3]), sizeof(paGdt[0]),
354	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
355	AssertRC(rc);
356	rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3]), sizeof(paGdt[0]),
357	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
358	AssertRC(rc);
359	rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]),
360	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
361	AssertRC(rc);
362	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]),
363	X86_PTE_RW \| X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
364	AssertRC(rc);
365	}
366	#endif /* VBOX_WITH_RAW_MODE */
367	return VINF_SUCCESS;
368	}
369
370
371	/**
372	* Setup the hypervisor GDT selectors in our shadow table
373	*
374	* @param pVM Pointer to the VM.
375	*/
376	static void selmR3SetupHyperGDTSelectors(PVM pVM)
377	{
378	PX86DESC paGdt = pVM->selm.s.paGdtR3;
379
380	/*
381	* Set up global code and data descriptors for use in the guest context.
382	* Both are wide open (base 0, limit 4GB)
383	*/
384	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> 3];
385	pDesc->Gen.u16LimitLow = 0xffff;
386	pDesc->Gen.u4LimitHigh = 0xf;
387	pDesc->Gen.u16BaseLow = 0;
388	pDesc->Gen.u8BaseHigh1 = 0;
389	pDesc->Gen.u8BaseHigh2 = 0;
390	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
391	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
392	pDesc->Gen.u2Dpl = 0; /* supervisor */
393	pDesc->Gen.u1Present = 1;
394	pDesc->Gen.u1Available = 0;
395	pDesc->Gen.u1Long = 0;
396	pDesc->Gen.u1DefBig = 1; /* def 32 bit */
397	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
398
399	/* data */
400	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> 3];
401	pDesc->Gen.u16LimitLow = 0xffff;
402	pDesc->Gen.u4LimitHigh = 0xf;
403	pDesc->Gen.u16BaseLow = 0;
404	pDesc->Gen.u8BaseHigh1 = 0;
405	pDesc->Gen.u8BaseHigh2 = 0;
406	pDesc->Gen.u4Type = X86_SEL_TYPE_RW_ACC;
407	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
408	pDesc->Gen.u2Dpl = 0; /* supervisor */
409	pDesc->Gen.u1Present = 1;
410	pDesc->Gen.u1Available = 0;
411	pDesc->Gen.u1Long = 0;
412	pDesc->Gen.u1DefBig = 1; /* big */
413	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
414
415	/* 64-bit mode code (& data?) */
416	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> 3];
417	pDesc->Gen.u16LimitLow = 0xffff;
418	pDesc->Gen.u4LimitHigh = 0xf;
419	pDesc->Gen.u16BaseLow = 0;
420	pDesc->Gen.u8BaseHigh1 = 0;
421	pDesc->Gen.u8BaseHigh2 = 0;
422	pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
423	pDesc->Gen.u1DescType = 1; /* not system, but code/data */
424	pDesc->Gen.u2Dpl = 0; /* supervisor */
425	pDesc->Gen.u1Present = 1;
426	pDesc->Gen.u1Available = 0;
427	pDesc->Gen.u1Long = 1; /* The Long (L) attribute bit. */
428	pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
429	pDesc->Gen.u1Granularity = 1; /* 4KB limit */
430
431	/*
432	* TSS descriptor
433	*/
434	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
435	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
436	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
437	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
438	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
439	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
440	pDesc->Gen.u4LimitHigh = 0;
441	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
442	pDesc->Gen.u1DescType = 0; /* system */
443	pDesc->Gen.u2Dpl = 0; /* supervisor */
444	pDesc->Gen.u1Present = 1;
445	pDesc->Gen.u1Available = 0;
446	pDesc->Gen.u1Long = 0;
447	pDesc->Gen.u1DefBig = 0;
448	pDesc->Gen.u1Granularity = 0; /* byte limit */
449
450	/*
451	* TSS descriptor for trap 08
452	*/
453	pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3];
454	pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
455	pDesc->Gen.u4LimitHigh = 0;
456	RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.TssTrap08);
457	pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
458	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
459	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
460	pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
461	pDesc->Gen.u1DescType = 0; /* system */
462	pDesc->Gen.u2Dpl = 0; /* supervisor */
463	pDesc->Gen.u1Present = 1;
464	pDesc->Gen.u1Available = 0;
465	pDesc->Gen.u1Long = 0;
466	pDesc->Gen.u1DefBig = 0;
467	pDesc->Gen.u1Granularity = 0; /* byte limit */
468	}
469
470	/**
471	* Applies relocations to data and code managed by this
472	* component. This function will be called at init and
473	* whenever the VMM need to relocate it self inside the GC.
474	*
475	* @param pVM The VM.
476	*/
477	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
478	{
479	PX86DESC paGdt = pVM->selm.s.paGdtR3;
480	LogFlow(("SELMR3Relocate\n"));
481
482	if (HMIsRawModeCtxNeeded(pVM))
483	{
484	for (VMCPUID i = 0; i < pVM->cCpus; i++)
485	{
486	PVMCPU pVCpu = &pVM->aCpus[i];
487
488	/*
489	* Update GDTR and selector.
490	*/
491	CPUMSetHyperGDTR(pVCpu, MMHyperR3ToRC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
492
493	/** @todo selector relocations should be a separate operation? */
494	CPUMSetHyperCS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]);
495	CPUMSetHyperDS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
496	CPUMSetHyperES(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
497	CPUMSetHyperSS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
498	CPUMSetHyperTR(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]);
499	}
500
501	selmR3SetupHyperGDTSelectors(pVM);
502
503	/** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
504	/** @todo PGM knows the proper CR3 values these days, not CPUM. */
505	/*
506	* Update the TSSes.
507	*/
508	/* Only applies to raw mode which supports only 1 VCPU */
509	PVMCPU pVCpu = &pVM->aCpus[0];
510
511	/* Current TSS */
512	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
513	pVM->selm.s.Tss.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
514	pVM->selm.s.Tss.esp0 = VMMGetStackRC(pVCpu);
515	pVM->selm.s.Tss.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
516	pVM->selm.s.Tss.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
517	pVM->selm.s.Tss.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
518	pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
519
520	/* trap 08 */
521	pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu); /* this should give use better survival chances. */
522	pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
523	pVM->selm.s.TssTrap08.ss = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
524	pVM->selm.s.TssTrap08.esp0 = VMMGetStackRC(pVCpu) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
525	pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
526	pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
527	pVM->selm.s.TssTrap08.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
528	pVM->selm.s.TssTrap08.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
529	pVM->selm.s.TssTrap08.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
530	pVM->selm.s.TssTrap08.fs = 0;
531	pVM->selm.s.TssTrap08.gs = 0;
532	pVM->selm.s.TssTrap08.selLdt = 0;
533	pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
534	pVM->selm.s.TssTrap08.ecx = VM_RC_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
535	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
536	pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
537	pVM->selm.s.TssTrap08.edx = VM_RC_ADDR(pVM, pVM); /* setup edx VM address. */
538	pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
539	pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
540	pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
541	/* TRPM will be updating the eip */
542	}
543
544	if (!HMIsEnabled(pVM))
545	{
546	/*
547	* Update shadow GDT/LDT/TSS write access handlers.
548	*/
549	PVMCPU pVCpu = VMMGetCpu(pVM); NOREF(pVCpu);
550	int rc; NOREF(rc);
551	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
552	if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
553	{
554	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.paGdtRC, true /fHypervisor/);
555	AssertRC(rc);
556	}
557	pVM->selm.s.paGdtRC = MMHyperR3ToRC(pVM, paGdt);
558	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowGdtWriteHandlerType,
559	pVM->selm.s.paGdtRC,
560	pVM->selm.s.paGdtRC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
561	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
562	AssertRC(rc);
563	#endif
564	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
565	if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
566	{
567	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.pvMonShwTssRC, true /fHypervisor/);
568	AssertRC(rc);
569	}
570	pVM->selm.s.pvMonShwTssRC = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
571	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowTssWriteHandlerType,
572	pVM->selm.s.pvMonShwTssRC,
573	pVM->selm.s.pvMonShwTssRC + sizeof(pVM->selm.s.Tss) - 1,
574	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
575	AssertRC(rc);
576	#endif
577
578	/*
579	* Update the GC LDT region handler and address.
580	*/
581	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
582	if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
583	{
584	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.pvLdtRC, true /fHypervisor/);
585	AssertRC(rc);
586	}
587	#endif
588	pVM->selm.s.pvLdtRC = MMHyperR3ToRC(pVM, pVM->selm.s.pvLdtR3);
589	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
590	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hShadowLdtWriteHandlerType,
591	pVM->selm.s.pvLdtRC,
592	pVM->selm.s.pvLdtRC + _64K + PAGE_SIZE - 1,
593	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
594	AssertRC(rc);
595	#endif
596	}
597	}
598
599
600	/**
601	* Terminates the SELM.
602	*
603	* Termination means cleaning up and freeing all resources,
604	* the VM it self is at this point powered off or suspended.
605	*
606	* @returns VBox status code.
607	* @param pVM Pointer to the VM.
608	*/
609	VMMR3DECL(int) SELMR3Term(PVM pVM)
610	{
611	NOREF(pVM);
612	return VINF_SUCCESS;
613	}
614
615
616	/**
617	* The VM is being reset.
618	*
619	* For the SELM component this means that any GDT/LDT/TSS monitors
620	* needs to be removed.
621	*
622	* @param pVM Pointer to the VM.
623	*/
624	VMMR3DECL(void) SELMR3Reset(PVM pVM)
625	{
626	LogFlow(("SELMR3Reset:\n"));
627	VM_ASSERT_EMT(pVM);
628
629	/*
630	* Uninstall guest GDT/LDT/TSS write access handlers.
631	*/
632	PVMCPU pVCpu = VMMGetCpu(pVM); NOREF(pVCpu);
633	int rc = VINF_SUCCESS;
634	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
635	{
636	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
637	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GuestGdtr.pGdt, false /fHypervisor/);
638	AssertRC(rc);
639	#endif
640	pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
641	pVM->selm.s.GuestGdtr.cbGdt = 0;
642	}
643	pVM->selm.s.fGDTRangeRegistered = false;
644	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
645	{
646	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
647	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
648	AssertRC(rc);
649	#endif
650	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
651	}
652	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
653	{
654	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
655	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestTss, false /fHypervisor/);
656	AssertRC(rc);
657	#endif
658	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
659	pVM->selm.s.GCSelTss = RTSEL_MAX;
660	}
661
662	/*
663	* Re-initialize other members.
664	*/
665	pVM->selm.s.cbLdtLimit = 0;
666	pVM->selm.s.offLdtHyper = 0;
667	pVM->selm.s.cbMonitoredGuestTss = 0;
668
669	pVM->selm.s.fSyncTSSRing0Stack = false;
670
671	#ifdef VBOX_WITH_RAW_MODE
672	if (!HMIsEnabled(pVM))
673	{
674	/*
675	* Default action when entering raw mode for the first time
676	*/
677	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
678	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
679	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
680	}
681	#endif
682	}
683
684
685	/**
686	* Execute state save operation.
687	*
688	* @returns VBox status code.
689	* @param pVM Pointer to the VM.
690	* @param pSSM SSM operation handle.
691	*/
692	static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
693	{
694	LogFlow(("selmR3Save:\n"));
695
696	/*
697	* Save the basic bits - fortunately all the other things can be resynced on load.
698	*/
699	PSELM pSelm = &pVM->selm.s;
700
701	SSMR3PutBool(pSSM, HMIsEnabled(pVM));
702	SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
703	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS]);
704	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_DS]);
705	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]);
706	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]); /* reserved for DS64. */
707	SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS]);
708	return SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]);
709	}
710
711
712	/**
713	* Execute state load operation.
714	*
715	* @returns VBox status code.
716	* @param pVM Pointer to the VM.
717	* @param pSSM SSM operation handle.
718	* @param uVersion Data layout version.
719	* @param uPass The data pass.
720	*/
721	static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
722	{
723	LogFlow(("selmR3Load:\n"));
724	Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
725
726	/*
727	* Validate version.
728	*/
729	if (uVersion != SELM_SAVED_STATE_VERSION)
730	{
731	AssertMsgFailed(("selmR3Load: Invalid version uVersion=%d!\n", uVersion));
732	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
733	}
734
735	/*
736	* Do a reset.
737	*/
738	SELMR3Reset(pVM);
739
740	/* Get the monitoring flag. */
741	bool fIgnored;
742	SSMR3GetBool(pSSM, &fIgnored);
743
744	/* Get the TSS state flag. */
745	SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
746
747	/*
748	* Get the selectors.
749	*/
750	RTSEL SelCS;
751	SSMR3GetSel(pSSM, &SelCS);
752	RTSEL SelDS;
753	SSMR3GetSel(pSSM, &SelDS);
754	RTSEL SelCS64;
755	SSMR3GetSel(pSSM, &SelCS64);
756	RTSEL SelDS64;
757	SSMR3GetSel(pSSM, &SelDS64);
758	RTSEL SelTSS;
759	SSMR3GetSel(pSSM, &SelTSS);
760	RTSEL SelTSSTrap08;
761	SSMR3GetSel(pSSM, &SelTSSTrap08);
762
763	/* Copy the selectors; they will be checked during relocation. */
764	PSELM pSelm = &pVM->selm.s;
765	pSelm->aHyperSel[SELM_HYPER_SEL_CS] = SelCS;
766	pSelm->aHyperSel[SELM_HYPER_SEL_DS] = SelDS;
767	pSelm->aHyperSel[SELM_HYPER_SEL_CS64] = SelCS64;
768	pSelm->aHyperSel[SELM_HYPER_SEL_TSS] = SelTSS;
769	pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SelTSSTrap08;
770
771	return VINF_SUCCESS;
772	}
773
774
775	/**
776	* Sync the GDT, LDT and TSS after loading the state.
777	*
778	* Just to play save, we set the FFs to force syncing before
779	* executing GC code.
780	*
781	* @returns VBox status code.
782	* @param pVM Pointer to the VM.
783	* @param pSSM SSM operation handle.
784	*/
785	static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
786	{
787	#ifdef VBOX_WITH_RAW_MODE
788	if (!HMIsEnabled(pVM))
789	{
790	PVMCPU pVCpu = VMMGetCpu(pVM);
791
792	LogFlow(("selmR3LoadDone:\n"));
793
794	/*
795	* Don't do anything if it's a load failure.
796	*/
797	int rc = SSMR3HandleGetStatus(pSSM);
798	if (RT_FAILURE(rc))
799	return VINF_SUCCESS;
800
801	/*
802	* Do the syncing if we're in protected mode and using raw-mode.
803	*/
804	if (PGMGetGuestMode(pVCpu) != PGMMODE_REAL)
805	{
806	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
807	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
808	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
809	SELMR3UpdateFromCPUM(pVM, pVCpu);
810	}
811
812	/*
813	* Flag everything for resync on next raw mode entry.
814	*/
815	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
816	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
817	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
818	}
819	#endif /VBOX_WITH_RAW_MODE/
820	return VINF_SUCCESS;
821	}
822
823	#ifdef VBOX_WITH_RAW_MODE
824
825	/**
826	* Updates (syncs) the shadow GDT.
827	*
828	* @returns VBox status code.
829	* @param pVM The VM handle.
830	* @param pVCpu The current virtual CPU.
831	*/
832	static int selmR3UpdateShadowGdt(PVM pVM, PVMCPU pVCpu)
833	{
834	Assert(!HMIsEnabled(pVM));
835
836	/*
837	* Always assume the best...
838	*/
839	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
840
841	/* If the GDT was changed, then make sure the LDT is checked too */
842	/** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
843	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
844	/* Same goes for the TSS selector */
845	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
846
847	/*
848	* Get the GDTR and check if there is anything to do (there usually is).
849	*/
850	VBOXGDTR GDTR;
851	CPUMGetGuestGDTR(pVCpu, &GDTR);
852	if (GDTR.cbGdt < sizeof(X86DESC))
853	{
854	Log(("No GDT entries...\n"));
855	return VINF_SUCCESS;
856	}
857
858	/*
859	* Read the Guest GDT.
860	* ASSUMES that the entire GDT is in memory.
861	*/
862	RTUINT cbEffLimit = GDTR.cbGdt;
863	PX86DESC pGDTE = &pVM->selm.s.paGdtR3[1];
864	int rc = PGMPhysSimpleReadGCPtr(pVCpu, pGDTE, GDTR.pGdt + sizeof(X86DESC), cbEffLimit + 1 - sizeof(X86DESC));
865	if (RT_FAILURE(rc))
866	{
867	/*
868	* Read it page by page.
869	*
870	* Keep track of the last valid page and delay memsets and
871	* adjust cbEffLimit to reflect the effective size. The latter
872	* is something we do in the belief that the guest will probably
873	* never actually commit the last page, thus allowing us to keep
874	* our selectors in the high end of the GDT.
875	*/
876	RTUINT cbLeft = cbEffLimit + 1 - sizeof(X86DESC);
877	RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(X86DESC);
878	uint8_t pu8Dst = (uint8_t )&pVM->selm.s.paGdtR3[1];
879	uint8_t *pu8DstInvalid = pu8Dst;
880
881	while (cbLeft)
882	{
883	RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
884	cb = RT_MIN(cb, cbLeft);
885	rc = PGMPhysSimpleReadGCPtr(pVCpu, pu8Dst, GCPtrSrc, cb);
886	if (RT_SUCCESS(rc))
887	{
888	if (pu8DstInvalid != pu8Dst)
889	RT_BZERO(pu8DstInvalid, pu8Dst - pu8DstInvalid);
890	GCPtrSrc += cb;
891	pu8Dst += cb;
892	pu8DstInvalid = pu8Dst;
893	}
894	else if ( rc == VERR_PAGE_NOT_PRESENT
895	\|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
896	{
897	GCPtrSrc += cb;
898	pu8Dst += cb;
899	}
900	else
901	{
902	AssertLogRelMsgFailed(("Couldn't read GDT at %016RX64, rc=%Rrc!\n", GDTR.pGdt, rc));
903	return VERR_SELM_GDT_READ_ERROR;
904	}
905	cbLeft -= cb;
906	}
907
908	/* any invalid pages at the end? */
909	if (pu8DstInvalid != pu8Dst)
910	{
911	cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtR3 - 1;
912	/* If any GDTEs was invalidated, zero them. */
913	if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
914	RT_BZERO(pu8DstInvalid + cbEffLimit + 1, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
915	}
916
917	/* keep track of the effective limit. */
918	if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
919	{
920	Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
921	pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
922	pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
923	}
924	}
925
926	/*
927	* Check if the Guest GDT intrudes on our GDT entries.
928	*/
929	/** @todo we should try to minimize relocations by making sure our current selectors can be reused. */
930	RTSEL aHyperSel[SELM_HYPER_SEL_MAX];
931	if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
932	{
933	PX86DESC pGDTEStart = pVM->selm.s.paGdtR3;
934	PX86DESC pGDTECur = (PX86DESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(X86DESC));
935	int iGDT = 0;
936
937	Log(("Internal SELM GDT conflict: use non-present entries\n"));
938	STAM_REL_COUNTER_INC(&pVM->selm.s.StatScanForHyperSels);
939	while ((uintptr_t)pGDTECur > (uintptr_t)pGDTEStart)
940	{
941	/* We can reuse non-present entries */
942	if (!pGDTECur->Gen.u1Present)
943	{
944	aHyperSel[iGDT] = ((uintptr_t)pGDTECur - (uintptr_t)pVM->selm.s.paGdtR3) / sizeof(X86DESC);
945	aHyperSel[iGDT] = aHyperSel[iGDT] << X86_SEL_SHIFT;
946	Log(("SELM: Found unused GDT %04X\n", aHyperSel[iGDT]));
947	iGDT++;
948	if (iGDT >= SELM_HYPER_SEL_MAX)
949	break;
950	}
951
952	pGDTECur--;
953	}
954	if (iGDT != SELM_HYPER_SEL_MAX)
955	{
956	AssertLogRelMsgFailed(("Internal SELM GDT conflict.\n"));
957	return VERR_SELM_GDT_TOO_FULL;
958	}
959	}
960	else
961	{
962	aHyperSel[SELM_HYPER_SEL_CS] = SELM_HYPER_DEFAULT_SEL_CS;
963	aHyperSel[SELM_HYPER_SEL_DS] = SELM_HYPER_DEFAULT_SEL_DS;
964	aHyperSel[SELM_HYPER_SEL_CS64] = SELM_HYPER_DEFAULT_SEL_CS64;
965	aHyperSel[SELM_HYPER_SEL_TSS] = SELM_HYPER_DEFAULT_SEL_TSS;
966	aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SELM_HYPER_DEFAULT_SEL_TSS_TRAP08;
967	}
968
969	# ifdef VBOX_WITH_SAFE_STR
970	/* Use the guest's TR selector to plug the str virtualization hole. */
971	if (CPUMGetGuestTR(pVCpu, NULL) != 0)
972	{
973	Log(("SELM: Use guest TSS selector %x\n", CPUMGetGuestTR(pVCpu, NULL)));
974	aHyperSel[SELM_HYPER_SEL_TSS] = CPUMGetGuestTR(pVCpu, NULL);
975	}
976	# endif
977
978	/*
979	* Work thru the copied GDT entries adjusting them for correct virtualization.
980	*/
981	PX86DESC pGDTEEnd = (PX86DESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(X86DESC));
982	while (pGDTE < pGDTEEnd)
983	{
984	if (pGDTE->Gen.u1Present)
985	selmGuestToShadowDesc(pVM, pGDTE);
986
987	/* Next GDT entry. */
988	pGDTE++;
989	}
990
991	/*
992	* Check if our hypervisor selectors were changed.
993	*/
994	if ( aHyperSel[SELM_HYPER_SEL_CS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]
995	\|\| aHyperSel[SELM_HYPER_SEL_DS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]
996	\|\| aHyperSel[SELM_HYPER_SEL_CS64] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64]
997	\|\| aHyperSel[SELM_HYPER_SEL_TSS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]
998	\|\| aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08])
999	{
1000	/* Reinitialize our hypervisor GDTs */
1001	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = aHyperSel[SELM_HYPER_SEL_CS];
1002	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = aHyperSel[SELM_HYPER_SEL_DS];
1003	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = aHyperSel[SELM_HYPER_SEL_CS64];
1004	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = aHyperSel[SELM_HYPER_SEL_TSS];
1005	pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
1006
1007	STAM_REL_COUNTER_INC(&pVM->selm.s.StatHyperSelsChanged);
1008
1009	/*
1010	* Do the relocation callbacks to let everyone update their hyper selector dependencies.
1011	* (SELMR3Relocate will call selmR3SetupHyperGDTSelectors() for us.)
1012	*/
1013	VMR3Relocate(pVM, 0);
1014	}
1015	# ifdef VBOX_WITH_SAFE_STR
1016	else if ( cbEffLimit >= SELM_HYPER_DEFAULT_BASE
1017	\|\| CPUMGetGuestTR(pVCpu, NULL) != 0) /* Our shadow TR entry was overwritten when we synced the guest's GDT. */
1018	# else
1019	else if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
1020	# endif
1021	/* We overwrote all entries above, so we have to save them again. */
1022	selmR3SetupHyperGDTSelectors(pVM);
1023
1024	/*
1025	* Adjust the cached GDT limit.
1026	* Any GDT entries which have been removed must be cleared.
1027	*/
1028	if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
1029	{
1030	if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
1031	RT_BZERO(pGDTE, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
1032	}
1033
1034	/*
1035	* Check if Guest's GDTR is changed.
1036	*/
1037	if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
1038	\|\| GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1039	{
1040	Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%016RX64 cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
1041
1042	# ifdef SELM_TRACK_GUEST_GDT_CHANGES
1043	/*
1044	* [Re]Register write virtual handler for guest's GDT.
1045	*/
1046	if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
1047	{
1048	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GuestGdtr.pGdt, false /fHypervisor/);
1049	AssertRC(rc);
1050	}
1051	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestGdtWriteHandlerType,
1052	GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1053	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1054	# ifdef VBOX_WITH_RAW_RING1
1055	/** @todo !HACK ALERT!
1056	* Some guest OSes (QNX) share code and the GDT on the same page;
1057	* PGMR3HandlerVirtualRegister doesn't support more than one handler,
1058	* so we kick out the PATM handler as this one is more important. Fix this
1059	* properly in PGMR3HandlerVirtualRegister?
1060	*/
1061	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1062	{
1063	LogRel(("selmR3UpdateShadowGdt: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority GDT page monitor\n", GDTR.pGdt));
1064	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, GDTR.pGdt & PAGE_BASE_GC_MASK, false /fHypervisor/);
1065	AssertRC(rc);
1066	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestGdtWriteHandlerType,
1067	GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
1068	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1069	}
1070	# endif
1071	if (RT_FAILURE(rc))
1072	return rc;
1073	# endif /* SELM_TRACK_GUEST_GDT_CHANGES */
1074
1075	/* Update saved Guest GDTR. */
1076	pVM->selm.s.GuestGdtr = GDTR;
1077	pVM->selm.s.fGDTRangeRegistered = true;
1078	}
1079
1080	return VINF_SUCCESS;
1081	}
1082
1083
1084	/**
1085	* Updates (syncs) the shadow LDT.
1086	*
1087	* @returns VBox status code.
1088	* @param pVM The VM handle.
1089	* @param pVCpu The current virtual CPU.
1090	*/
1091	static int selmR3UpdateShadowLdt(PVM pVM, PVMCPU pVCpu)
1092	{
1093	int rc = VINF_SUCCESS;
1094	Assert(!HMIsEnabled(pVM));
1095
1096	/*
1097	* Always assume the best...
1098	*/
1099	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
1100
1101	/*
1102	* LDT handling is done similarly to the GDT handling with a shadow
1103	* array. However, since the LDT is expected to be swappable (at least
1104	* some ancient OSes makes it swappable) it must be floating and
1105	* synced on a per-page basis.
1106	*
1107	* Eventually we will change this to be fully on demand. Meaning that
1108	* we will only sync pages containing LDT selectors actually used and
1109	* let the #PF handler lazily sync pages as they are used.
1110	* (This applies to GDT too, when we start making OS/2 fast.)
1111	*/
1112
1113	/*
1114	* First, determine the current LDT selector.
1115	*/
1116	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1117	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
1118	{
1119	/* ldtr = 0 - update hyper LDTR and deregister any active handler. */
1120	CPUMSetHyperLDTR(pVCpu, 0);
1121	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1122	{
1123	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1124	AssertRC(rc);
1125	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1126	}
1127	pVM->selm.s.cbLdtLimit = 0;
1128	return VINF_SUCCESS;
1129	}
1130
1131	/*
1132	* Get the LDT selector.
1133	*/
1134	/** @todo this is wrong, use CPUMGetGuestLdtrEx */
1135	PX86DESC pDesc = &pVM->selm.s.paGdtR3[SelLdt >> X86_SEL_SHIFT];
1136	RTGCPTR GCPtrLdt = X86DESC_BASE(pDesc);
1137	uint32_t cbLdt = X86DESC_LIMIT_G(pDesc);
1138
1139	/*
1140	* Validate it.
1141	*/
1142	if ( !cbLdt
1143	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
1144	\|\| pDesc->Gen.u1DescType
1145	\|\| pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1146	{
1147	AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
1148
1149	/* cbLdt > 0:
1150	* This is quite impossible, so we do as most people do when faced with
1151	* the impossible, we simply ignore it.
1152	*/
1153	CPUMSetHyperLDTR(pVCpu, 0);
1154	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1155	{
1156	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1157	AssertRC(rc);
1158	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1159	}
1160	return VINF_SUCCESS;
1161	}
1162	/** @todo check what intel does about odd limits. */
1163	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1164
1165	/*
1166	* Use the cached guest ldt address if the descriptor has already been modified (see below)
1167	* (this is necessary due to redundant LDT updates; see todo above at GDT sync)
1168	*/
1169	if (MMHyperIsInsideArea(pVM, GCPtrLdt))
1170	GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
1171
1172
1173	/** @todo Handle only present LDT segments. */
1174	// if (pDesc->Gen.u1Present)
1175	{
1176	/*
1177	* Check if Guest's LDT address/limit is changed.
1178	*/
1179	if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
1180	\|\| cbLdt != pVM->selm.s.cbLdtLimit)
1181	{
1182	Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %RGv:%04x to %RGv:%04x. (GDTR=%016RX64:%04x)\n",
1183	pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1184
1185	# ifdef SELM_TRACK_GUEST_LDT_CHANGES
1186	/*
1187	* [Re]Register write virtual handler for guest's GDT.
1188	* In the event of LDT overlapping something, don't install it just assume it's being updated.
1189	*/
1190	if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
1191	{
1192	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestLdt, false /fHypervisor/);
1193	AssertRC(rc);
1194	}
1195	# ifdef LOG_ENABLED
1196	if (pDesc->Gen.u1Present)
1197	Log(("LDT selector marked not present!!\n"));
1198	# endif
1199	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestLdtWriteHandlerType,
1200	GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
1201	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1202	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1203	{
1204	/** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
1205	pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
1206	Log(("WARNING: Guest LDT (%RGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%016RX64:%04x)\n",
1207	GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
1208	}
1209	else if (RT_SUCCESS(rc))
1210	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1211	else
1212	{
1213	CPUMSetHyperLDTR(pVCpu, 0);
1214	return rc;
1215	}
1216	# else
1217	pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
1218	# endif
1219	pVM->selm.s.cbLdtLimit = cbLdt;
1220	}
1221	}
1222
1223	/*
1224	* Calc Shadow LDT base.
1225	*/
1226	unsigned off;
1227	pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
1228	RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.pvLdtRC + off);
1229	PX86DESC pShadowLDT = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1230
1231	/*
1232	* Enable the LDT selector in the shadow GDT.
1233	*/
1234	pDesc->Gen.u1Present = 1;
1235	pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
1236	pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
1237	pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
1238	pDesc->Gen.u1Available = 0;
1239	pDesc->Gen.u1Long = 0;
1240	if (cbLdt > 0xffff)
1241	{
1242	cbLdt = 0xffff;
1243	pDesc->Gen.u4LimitHigh = 0;
1244	pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
1245	}
1246
1247	/*
1248	* Set Hyper LDTR and notify TRPM.
1249	*/
1250	CPUMSetHyperLDTR(pVCpu, SelLdt);
1251
1252	/*
1253	* Loop synchronising the LDT page by page.
1254	*/
1255	/** @todo investigate how intel handle various operations on half present cross page entries. */
1256	off = GCPtrLdt & (sizeof(X86DESC) - 1);
1257	AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
1258
1259	/* Note: Do not skip the first selector; unlike the GDT, a zero LDT selector is perfectly valid. */
1260	unsigned cbLeft = cbLdt + 1;
1261	PX86DESC pLDTE = pShadowLDT;
1262	while (cbLeft)
1263	{
1264	/*
1265	* Read a chunk.
1266	*/
1267	unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
1268	if (cbChunk > cbLeft)
1269	cbChunk = cbLeft;
1270	rc = PGMPhysSimpleReadGCPtr(pVCpu, pShadowLDT, GCPtrLdt, cbChunk);
1271	if (RT_SUCCESS(rc))
1272	{
1273	/*
1274	* Mark page
1275	*/
1276	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P \| X86_PTE_A \| X86_PTE_D);
1277	AssertRC(rc);
1278
1279	/*
1280	* Loop thru the available LDT entries.
1281	* Figure out where to start and end and the potential cross pageness of
1282	* things adds a little complexity. pLDTE is updated there and not in the
1283	* 'next' part of the loop. The pLDTEEnd is inclusive.
1284	*/
1285	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
1286	if (pLDTE + 1 < pShadowLDT)
1287	pLDTE = (PX86DESC)((uintptr_t)pShadowLDT + off);
1288	while (pLDTE <= pLDTEEnd)
1289	{
1290	if (pLDTE->Gen.u1Present)
1291	selmGuestToShadowDesc(pVM, pLDTE);
1292
1293	/* Next LDT entry. */
1294	pLDTE++;
1295	}
1296	}
1297	else
1298	{
1299	RT_BZERO(pShadowLDT, cbChunk);
1300	AssertMsg(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%Rrc\n", rc));
1301	rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
1302	AssertRC(rc);
1303	}
1304
1305	/*
1306	* Advance to the next page.
1307	*/
1308	cbLeft -= cbChunk;
1309	GCPtrShadowLDT += cbChunk;
1310	pShadowLDT = (PX86DESC)((char *)pShadowLDT + cbChunk);
1311	GCPtrLdt += cbChunk;
1312	}
1313
1314	return VINF_SUCCESS;
1315	}
1316
1317
1318	/**
1319	* Checks and updates segment selector registers.
1320	*
1321	* @returns VBox strict status code.
1322	* @retval VINF_EM_RESCHEDULE_REM if a stale register was found.
1323	*
1324	* @param pVM The VM handle.
1325	* @param pVCpu The current virtual CPU.
1326	*/
1327	static VBOXSTRICTRC selmR3UpdateSegmentRegisters(PVM pVM, PVMCPU pVCpu)
1328	{
1329	Assert(CPUMIsGuestInProtectedMode(pVCpu));
1330	Assert(!HMIsEnabled(pVM));
1331
1332	/*
1333	* No stale selectors in V8086 mode.
1334	*/
1335	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu);
1336	if (pCtx->eflags.Bits.u1VM)
1337	return VINF_SUCCESS;
1338
1339	/*
1340	* Check for stale selectors and load hidden register bits where they
1341	* are missing.
1342	*/
1343	uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
1344	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
1345	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
1346	for (uint32_t iSReg = 0; iSReg < X86_SREG_COUNT; iSReg++)
1347	{
1348	RTSEL const Sel = paSReg[iSReg].Sel;
1349	if (Sel & X86_SEL_MASK_OFF_RPL)
1350	{
1351	/* Get the shadow descriptor entry corresponding to this. */
1352	static X86DESC const s_NotPresentDesc = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
1353	PCX86DESC pDesc;
1354	if (!(Sel & X86_SEL_LDT))
1355	{
1356	if ((Sel \| (sizeof(*pDesc) - 1)) <= pCtx->gdtr.cbGdt)
1357	pDesc = &pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
1358	else
1359	pDesc = &s_NotPresentDesc;
1360	}
1361	else
1362	{
1363	if ((Sel \| (sizeof(*pDesc) - 1)) <= pVM->selm.s.cbLdtLimit)
1364	pDesc = &((PCX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper))[Sel >> X86_SEL_SHIFT];
1365	else
1366	pDesc = &s_NotPresentDesc;
1367	}
1368
1369	/* Check the segment register. */
1370	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
1371	{
1372	if (!(paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE))
1373	{
1374	/* Did it go stale? */
1375	if (selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
1376	{
1377	Log2(("SELM: Detected stale %s=%#x (was valid)\n", g_aszSRegNms[iSReg], Sel));
1378	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
1379	paSReg[iSReg].fFlags \|= CPUMSELREG_FLAGS_STALE;
1380	rcStrict = VINF_EM_RESCHEDULE_REM;
1381	}
1382	}
1383	else
1384	{
1385	/* Did it stop being stale? I.e. did the guest change it things
1386	back to the way they were? */
1387	if (!selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
1388	{
1389	STAM_REL_COUNTER_INC(&pVM->selm.s.StatStaleToUnstaleSReg);
1390	paSReg[iSReg].fFlags &= CPUMSELREG_FLAGS_STALE;
1391	}
1392	else
1393	{
1394	Log2(("SELM: Already stale %s=%#x\n", g_aszSRegNms[iSReg], Sel));
1395	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatAlreadyStaleSReg[iSReg]);
1396	rcStrict = VINF_EM_RESCHEDULE_REM;
1397	}
1398	}
1399	}
1400	/* Load the hidden registers if it's a valid descriptor for the
1401	current segment register. */
1402	else if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
1403	{
1404	selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
1405	STAM_COUNTER_INC(&pVM->selm.s.aStatUpdatedSReg[iSReg]);
1406	}
1407	/* It's stale. */
1408	else
1409	{
1410	Log2(("SELM: Detected stale %s=%#x (wasn't valid)\n", g_aszSRegNms[iSReg], Sel));
1411	STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
1412	paSReg[iSReg].fFlags = CPUMSELREG_FLAGS_STALE;
1413	rcStrict = VINF_EM_RESCHEDULE_REM;
1414	}
1415	}
1416	/* else: 0 selector, ignore. */
1417	}
1418
1419	return rcStrict;
1420	}
1421
1422
1423	/**
1424	* Updates the Guest GDT & LDT virtualization based on current CPU state.
1425	*
1426	* @returns VBox status code.
1427	* @param pVM Pointer to the VM.
1428	* @param pVCpu Pointer to the VMCPU.
1429	*/
1430	VMMR3DECL(VBOXSTRICTRC) SELMR3UpdateFromCPUM(PVM pVM, PVMCPU pVCpu)
1431	{
1432	STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
1433	AssertReturn(!HMIsEnabled(pVM), VERR_SELM_HM_IPE);
1434
1435	/*
1436	* GDT sync
1437	*/
1438	int rc;
1439	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
1440	{
1441	rc = selmR3UpdateShadowGdt(pVM, pVCpu);
1442	if (RT_FAILURE(rc))
1443	return rc; /* We're toast, so forget the profiling. */
1444	AssertRCSuccess(rc);
1445	}
1446
1447	/*
1448	* TSS sync
1449	*/
1450	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1451	{
1452	rc = SELMR3SyncTSS(pVM, pVCpu);
1453	if (RT_FAILURE(rc))
1454	return rc;
1455	AssertRCSuccess(rc);
1456	}
1457
1458	/*
1459	* LDT sync
1460	*/
1461	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT))
1462	{
1463	rc = selmR3UpdateShadowLdt(pVM, pVCpu);
1464	if (RT_FAILURE(rc))
1465	return rc;
1466	AssertRCSuccess(rc);
1467	}
1468
1469	/*
1470	* Check selector registers.
1471	*/
1472	VBOXSTRICTRC rcStrict = selmR3UpdateSegmentRegisters(pVM, pVCpu);
1473
1474	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1475	return rcStrict;
1476	}
1477
1478
1479	/**
1480	* Synchronize the shadowed fields in the TSS.
1481	*
1482	* At present we're shadowing the ring-0 stack selector & pointer, and the
1483	* interrupt redirection bitmap (if present). We take the lazy approach wrt to
1484	* REM and this function is called both if REM made any changes to the TSS or
1485	* loaded TR.
1486	*
1487	* @returns VBox status code.
1488	* @param pVM Pointer to the VM.
1489	* @param pVCpu Pointer to the VMCPU.
1490	*/
1491	VMMR3DECL(int) SELMR3SyncTSS(PVM pVM, PVMCPU pVCpu)
1492	{
1493	int rc;
1494	AssertReturnStmt(!HMIsEnabled(pVM), VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS), VINF_SUCCESS);
1495
1496	STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
1497	Assert(VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS));
1498
1499	/*
1500	* Get TR and extract and store the basic info.
1501	*
1502	* Note! The TSS limit is not checked by the LTR code, so we
1503	* have to be a bit careful with it. We make sure cbTss
1504	* won't be zero if TR is valid and if it's NULL we'll
1505	* make sure cbTss is 0.
1506	*/
1507	/** @todo use the hidden bits, not shadow GDT. */
1508	CPUMSELREGHID trHid;
1509	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1510	RTGCPTR GCPtrTss = trHid.u64Base;
1511	uint32_t cbTss = trHid.u32Limit;
1512	Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
1513	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1514	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1515	if (SelTss & X86_SEL_MASK_OFF_RPL)
1516	{
1517	Assert(!(SelTss & X86_SEL_LDT));
1518	Assert(trHid.Attr.n.u1DescType == 0);
1519	Assert( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1520	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY);
1521	if (!++cbTss)
1522	cbTss = UINT32_MAX;
1523	}
1524	else
1525	{
1526	Assert( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1527	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1528	cbTss = 0; /* the reset case. */
1529	}
1530	pVM->selm.s.cbGuestTss = cbTss;
1531	pVM->selm.s.fGuestTss32Bit = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1532	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1533
1534	/*
1535	* Figure out the size of what need to monitor.
1536	*/
1537	/* We're not interested in any 16-bit TSSes. */
1538	uint32_t cbMonitoredTss = cbTss;
1539	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1540	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1541	cbMonitoredTss = 0;
1542
1543	pVM->selm.s.offGuestIoBitmap = 0;
1544	bool fNoRing1Stack = true;
1545	if (cbMonitoredTss)
1546	{
1547	/*
1548	* 32-bit TSS. What we're really keen on is the SS0 and ESP0 fields.
1549	* If VME is enabled we also want to keep an eye on the interrupt
1550	* redirection bitmap.
1551	*/
1552	VBOXTSS Tss;
1553	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1554	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1555	if ( !(cr4 & X86_CR4_VME)
1556	\|\| ( RT_SUCCESS(rc)
1557	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1558	&& Tss.offIoBitmap > cbTss) /* beyond the end / /* @todo not sure how the partial case is handled; probably not allowed. */
1559	)
1560	/* No interrupt redirection bitmap, just ESP0 and SS0. */
1561	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1562	else if (RT_SUCCESS(rc))
1563	{
1564	/*
1565	* Everything up to and including the interrupt redirection bitmap. Unfortunately
1566	* this can be quite a large chunk. We use to skip it earlier and just hope it
1567	* was kind of static...
1568	*
1569	* Update the virtual interrupt redirection bitmap while we're here.
1570	* (It is located in the 32 bytes before TR:offIoBitmap.)
1571	*/
1572	cbMonitoredTss = Tss.offIoBitmap;
1573	pVM->selm.s.offGuestIoBitmap = Tss.offIoBitmap;
1574
1575	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1576	rc = PGMPhysSimpleReadGCPtr(pVCpu, &pVM->selm.s.Tss.IntRedirBitmap,
1577	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1578	AssertRC(rc);
1579	/** @todo memset the bitmap on failure? */
1580	Log2(("Redirection bitmap:\n"));
1581	Log2(("%.*Rhxd\n", sizeof(Tss.IntRedirBitmap), &pVM->selm.s.Tss.IntRedirBitmap));
1582	}
1583	else
1584	{
1585	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1586	pVM->selm.s.offGuestIoBitmap = 0;
1587	/** @todo memset the bitmap? */
1588	}
1589
1590	/*
1591	* Update the ring 0 stack selector and base address.
1592	*/
1593	if (RT_SUCCESS(rc))
1594	{
1595	# ifdef LOG_ENABLED
1596	if (LogIsEnabled())
1597	{
1598	uint32_t ssr0, espr0;
1599	SELMGetRing1Stack(pVM, &ssr0, &espr0);
1600	if ((ssr0 & ~1) != Tss.ss0 \|\| espr0 != Tss.esp0)
1601	{
1602	RTGCPHYS GCPhys = NIL_RTGCPHYS;
1603	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1604	Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1605	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1606	AssertMsg(ssr0 != Tss.ss0,
1607	("ring-1 leak into TSS.SS0! %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
1608	Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
1609	}
1610	Log(("offIoBitmap=%#x\n", Tss.offIoBitmap));
1611	}
1612	# endif /* LOG_ENABLED */
1613	AssertMsg(!(Tss.ss0 & 3), ("ring-1 leak into TSS.SS0? %04X:%08X\n", Tss.ss0, Tss.esp0));
1614
1615	/* Update our TSS structure for the guest's ring 1 stack */
1616	selmSetRing1Stack(pVM, Tss.ss0 \| 1, Tss.esp0);
1617	pVM->selm.s.fSyncTSSRing0Stack = fNoRing1Stack = false;
1618
1619	# ifdef VBOX_WITH_RAW_RING1
1620	/* Update our TSS structure for the guest's ring 2 stack */
1621	if (EMIsRawRing1Enabled(pVM))
1622	{
1623	if ( (pVM->selm.s.Tss.ss2 != ((Tss.ss1 & ~2) \| 1))
1624	\|\| pVM->selm.s.Tss.esp2 != Tss.esp1)
1625	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));
1626	selmSetRing2Stack(pVM, (Tss.ss1 & ~1) \| 2, Tss.esp1);
1627	}
1628	# endif
1629	}
1630	}
1631
1632	/*
1633	* Flush the ring-1 stack and the direct syscall dispatching if we
1634	* cannot obtain SS0:ESP0.
1635	*/
1636	if (fNoRing1Stack)
1637	{
1638	selmSetRing1Stack(pVM, 0 /* invalid SS */, 0);
1639	pVM->selm.s.fSyncTSSRing0Stack = cbMonitoredTss != 0;
1640
1641	/** @todo handle these dependencies better! */
1642	TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
1643	TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
1644	}
1645
1646	/*
1647	* Check for monitor changes and apply them.
1648	*/
1649	if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
1650	\|\| cbMonitoredTss != pVM->selm.s.cbMonitoredGuestTss)
1651	{
1652	Log(("SELMR3SyncTSS: Guest's TSS is changed to pTss=%RGv cbMonitoredTss=%08X cbGuestTss=%#08x\n",
1653	GCPtrTss, cbMonitoredTss, pVM->selm.s.cbGuestTss));
1654
1655	/* Release the old range first. */
1656	if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
1657	{
1658	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, pVM->selm.s.GCPtrGuestTss, false /fHypervisor/);
1659	AssertRC(rc);
1660	}
1661
1662	/* Register the write handler if TS != 0. */
1663	if (cbMonitoredTss != 0)
1664	{
1665	# ifdef SELM_TRACK_GUEST_TSS_CHANGES
1666	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestTssWriteHandlerType,
1667	GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1668	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1669	if (RT_FAILURE(rc))
1670	{
1671	# ifdef VBOX_WITH_RAW_RING1
1672	/** @todo !HACK ALERT!
1673	* Some guest OSes (QNX) share code and the TSS on the same page;
1674	* PGMR3HandlerVirtualRegister doesn't support more than one
1675	* handler, so we kick out the PATM handler as this one is more
1676	* important. Fix this properly in PGMR3HandlerVirtualRegister?
1677	*/
1678	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
1679	{
1680	LogRel(("SELMR3SyncTSS: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority TSS page monitor\n", GCPtrTss));
1681	rc = PGMHandlerVirtualDeregister(pVM, pVCpu, GCPtrTss & PAGE_BASE_GC_MASK, false /fHypervisor/);
1682	AssertRC(rc);
1683
1684	rc = PGMR3HandlerVirtualRegister(pVM, pVCpu, pVM->selm.s.hGuestTssWriteHandlerType,
1685	GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
1686	NULL /pvUserR3/, NIL_RTR0PTR /pvUserRC/, NULL /pszDesc/);
1687	if (RT_FAILURE(rc))
1688	{
1689	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1690	return rc;
1691	}
1692	}
1693	# else
1694	STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
1695	return rc;
1696	# endif
1697	}
1698	# endif /* SELM_TRACK_GUEST_TSS_CHANGES */
1699
1700	/* Update saved Guest TSS info. */
1701	pVM->selm.s.GCPtrGuestTss = GCPtrTss;
1702	pVM->selm.s.cbMonitoredGuestTss = cbMonitoredTss;
1703	pVM->selm.s.GCSelTss = SelTss;
1704	}
1705	else
1706	{
1707	pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
1708	pVM->selm.s.cbMonitoredGuestTss = 0;
1709	pVM->selm.s.GCSelTss = 0;
1710	}
1711	}
1712
1713	VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
1714
1715	STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
1716	return VINF_SUCCESS;
1717	}
1718
1719
1720	/**
1721	* Compares the Guest GDT and LDT with the shadow tables.
1722	* This is a VBOX_STRICT only function.
1723	*
1724	* @returns VBox status code.
1725	* @param pVM Pointer to the VM.
1726	*/
1727	VMMR3DECL(int) SELMR3DebugCheck(PVM pVM)
1728	{
1729	# ifdef VBOX_STRICT
1730	PVMCPU pVCpu = VMMGetCpu(pVM);
1731	AssertReturn(!HMIsEnabled(pVM), VERR_SELM_HM_IPE);
1732
1733	/*
1734	* Get GDTR and check for conflict.
1735	*/
1736	VBOXGDTR GDTR;
1737	CPUMGetGuestGDTR(pVCpu, &GDTR);
1738	if (GDTR.cbGdt == 0)
1739	return VINF_SUCCESS;
1740
1741	if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
1742	Log(("SELMR3DebugCheck: guest GDT size forced us to look for unused selectors.\n"));
1743
1744	if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
1745	Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
1746
1747	/*
1748	* Loop thru the GDT checking each entry.
1749	*/
1750	RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
1751	PX86DESC pGDTE = pVM->selm.s.paGdtR3;
1752	PX86DESC pGDTEEnd = (PX86DESC)((uintptr_t)pGDTE + GDTR.cbGdt);
1753	while (pGDTE < pGDTEEnd)
1754	{
1755	X86DESC GDTEGuest;
1756	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
1757	if (RT_SUCCESS(rc))
1758	{
1759	if (pGDTE->Gen.u1DescType \|\| pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
1760	{
1761	if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
1762	\|\| pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
1763	\|\| pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
1764	\|\| pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
1765	\|\| pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
1766	\|\| pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
1767	\|\| pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
1768	{
1769	unsigned iGDT = pGDTE - pVM->selm.s.paGdtR3;
1770	SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
1771	SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
1772	}
1773	}
1774	}
1775
1776	/* Advance to the next descriptor. */
1777	GCPtrGDTEGuest += sizeof(X86DESC);
1778	pGDTE++;
1779	}
1780
1781
1782	/*
1783	* LDT?
1784	*/
1785	RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
1786	if ((SelLdt & X86_SEL_MASK_OFF_RPL) == 0)
1787	return VINF_SUCCESS;
1788	Assert(!(SelLdt & X86_SEL_LDT));
1789	if (SelLdt > GDTR.cbGdt)
1790	{
1791	Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
1792	return VERR_SELM_LDT_OUT_OF_BOUNDS;
1793	}
1794	X86DESC LDTDesc;
1795	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
1796	if (RT_FAILURE(rc))
1797	{
1798	Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
1799	return rc;
1800	}
1801	RTGCPTR GCPtrLDTEGuest = X86DESC_BASE(&LDTDesc);
1802	uint32_t cbLdt = X86DESC_LIMIT_G(&LDTDesc);
1803
1804	/*
1805	* Validate it.
1806	*/
1807	if (!cbLdt)
1808	return VINF_SUCCESS;
1809	/** @todo check what intel does about odd limits. */
1810	AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
1811	if ( LDTDesc.Gen.u1DescType
1812	\|\| LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
1813	\|\| SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
1814	{
1815	Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
1816	return VERR_SELM_INVALID_LDT;
1817	}
1818
1819	/*
1820	* Loop thru the LDT checking each entry.
1821	*/
1822	unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
1823	PX86DESC pLDTE = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1824	PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pGDTE + cbLdt);
1825	while (pLDTE < pLDTEEnd)
1826	{
1827	X86DESC LDTEGuest;
1828	rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
1829	if (RT_SUCCESS(rc))
1830	{
1831	if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
1832	\|\| pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
1833	\|\| pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
1834	\|\| pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
1835	\|\| pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
1836	\|\| pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
1837	\|\| pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
1838	{
1839	unsigned iLDT = pLDTE - (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
1840	SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
1841	SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
1842	}
1843	}
1844
1845	/* Advance to the next descriptor. */
1846	GCPtrLDTEGuest += sizeof(X86DESC);
1847	pLDTE++;
1848	}
1849
1850	# else /* !VBOX_STRICT */
1851	NOREF(pVM);
1852	# endif /* !VBOX_STRICT */
1853
1854	return VINF_SUCCESS;
1855	}
1856
1857
1858	/**
1859	* Validates the RawR0 TSS values against the one in the Guest TSS.
1860	*
1861	* @returns true if it matches.
1862	* @returns false and assertions on mismatch..
1863	* @param pVM Pointer to the VM.
1864	*/
1865	VMMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
1866	{
1867	# if defined(VBOX_STRICT) && defined(SELM_TRACK_GUEST_TSS_CHANGES)
1868	PVMCPU pVCpu = VMMGetCpu(pVM);
1869
1870	if (VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
1871	return true;
1872
1873	/*
1874	* Get TR and extract the basic info.
1875	*/
1876	CPUMSELREGHID trHid;
1877	RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
1878	RTGCPTR GCPtrTss = trHid.u64Base;
1879	uint32_t cbTss = trHid.u32Limit;
1880	Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
1881	\|\| (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1882	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
1883	if (SelTss & X86_SEL_MASK_OFF_RPL)
1884	{
1885	AssertReturn(!(SelTss & X86_SEL_LDT), false);
1886	AssertReturn(trHid.Attr.n.u1DescType == 0, false);
1887	AssertReturn( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
1888	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY,
1889	false);
1890	if (!++cbTss)
1891	cbTss = UINT32_MAX;
1892	}
1893	else
1894	{
1895	AssertReturn( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
1896	\|\| (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */),
1897	false);
1898	cbTss = 0; /* the reset case. */
1899	}
1900	AssertMsgReturn(pVM->selm.s.cbGuestTss == cbTss, ("%#x %#x\n", pVM->selm.s.cbGuestTss, cbTss), false);
1901	AssertMsgReturn(pVM->selm.s.fGuestTss32Bit == ( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1902	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY),
1903	("%RTbool u4Type=%d\n", pVM->selm.s.fGuestTss32Bit, trHid.Attr.n.u4Type),
1904	false);
1905	AssertMsgReturn( pVM->selm.s.GCSelTss == SelTss
1906	\|\| (!pVM->selm.s.GCSelTss && !(SelTss & X86_SEL_LDT)),
1907	("%#x %#x\n", pVM->selm.s.GCSelTss, SelTss),
1908	false);
1909	AssertMsgReturn( pVM->selm.s.GCPtrGuestTss == GCPtrTss
1910	\|\| (pVM->selm.s.GCPtrGuestTss == RTRCPTR_MAX && !GCPtrTss),
1911	("%#RGv %#RGv\n", pVM->selm.s.GCPtrGuestTss, GCPtrTss),
1912	false);
1913
1914
1915	/*
1916	* Figure out the size of what need to monitor.
1917	*/
1918	/* We're not interested in any 16-bit TSSes. */
1919	uint32_t cbMonitoredTss = cbTss;
1920	if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
1921	&& trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
1922	cbMonitoredTss = 0;
1923	if (cbMonitoredTss)
1924	{
1925	VBOXTSS Tss;
1926	uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
1927	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
1928	AssertReturn( rc == VINF_SUCCESS
1929	/* Happens early in XP boot during page table switching. */
1930	\|\| ( (rc == VERR_PAGE_TABLE_NOT_PRESENT \|\| rc == VERR_PAGE_NOT_PRESENT)
1931	&& !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF)),
1932	false);
1933	if ( !(cr4 & X86_CR4_VME)
1934	\|\| ( RT_SUCCESS(rc)
1935	&& Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
1936	&& Tss.offIoBitmap > cbTss)
1937	)
1938	cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
1939	else if (RT_SUCCESS(rc))
1940	{
1941	cbMonitoredTss = Tss.offIoBitmap;
1942	AssertMsgReturn(pVM->selm.s.offGuestIoBitmap == Tss.offIoBitmap,
1943	("#x %#x\n", pVM->selm.s.offGuestIoBitmap, Tss.offIoBitmap),
1944	false);
1945
1946	/* check the bitmap */
1947	uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
1948	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss.IntRedirBitmap,
1949	GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
1950	AssertRCReturn(rc, false);
1951	AssertMsgReturn(!memcmp(&Tss.IntRedirBitmap[0], &pVM->selm.s.Tss.IntRedirBitmap[0], sizeof(Tss.IntRedirBitmap)),
1952	("offIoBitmap=%#x cbTss=%#x\n"
1953	" Guest: %.32Rhxs\n"
1954	"Shadow: %.32Rhxs\n",
1955	Tss.offIoBitmap, cbTss,
1956	&Tss.IntRedirBitmap[0],
1957	&pVM->selm.s.Tss.IntRedirBitmap[0]),
1958	false);
1959	}
1960	else
1961	cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
1962
1963	/*
1964	* Check SS0 and ESP0.
1965	*/
1966	if ( !pVM->selm.s.fSyncTSSRing0Stack
1967	&& RT_SUCCESS(rc))
1968	{
1969	if ( Tss.esp0 != pVM->selm.s.Tss.esp1
1970	\|\| Tss.ss0 != (pVM->selm.s.Tss.ss1 & ~1))
1971	{
1972	RTGCPHYS GCPhys;
1973	rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
1974	AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%RGv Phys=%RGp\n",
1975	(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1,
1976	Tss.ss1, Tss.esp1, GCPtrTss, GCPhys));
1977	return false;
1978	}
1979	}
1980	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1981	}
1982	else
1983	{
1984	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);
1985	AssertReturn(!pVM->selm.s.fSyncTSSRing0Stack, false);
1986	AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
1987	}
1988
1989
1990
1991	return true;
1992
1993	# else /* !VBOX_STRICT */
1994	NOREF(pVM);
1995	return true;
1996	# endif /* !VBOX_STRICT */
1997	}
1998
1999
2000	# ifdef VBOX_WITH_SAFE_STR
2001	/**
2002	* Validates the RawR0 TR shadow GDT entry.
2003	*
2004	* @returns true if it matches.
2005	* @returns false and assertions on mismatch..
2006	* @param pVM Pointer to the VM.
2007	*/
2008	VMMR3DECL(bool) SELMR3CheckShadowTR(PVM pVM)
2009	{
2010	# ifdef VBOX_STRICT
2011	PX86DESC paGdt = pVM->selm.s.paGdtR3;
2012
2013	/*
2014	* TSS descriptor
2015	*/
2016	PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
2017	RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
2018
2019	if ( pDesc->Gen.u16BaseLow != RT_LOWORD(RCPtrTSS)
2020	\|\| pDesc->Gen.u8BaseHigh1 != RT_BYTE3(RCPtrTSS)
2021	\|\| pDesc->Gen.u8BaseHigh2 != RT_BYTE4(RCPtrTSS)
2022	\|\| pDesc->Gen.u16LimitLow != sizeof(VBOXTSS) - 1
2023	\|\| pDesc->Gen.u4LimitHigh != 0
2024	\|\| (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL && pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
2025	\|\| pDesc->Gen.u1DescType != 0 /* system */
2026	\|\| pDesc->Gen.u2Dpl != 0 /* supervisor */
2027	\|\| pDesc->Gen.u1Present != 1
2028	\|\| pDesc->Gen.u1Available != 0
2029	\|\| pDesc->Gen.u1Long != 0
2030	\|\| pDesc->Gen.u1DefBig != 0
2031	\|\| pDesc->Gen.u1Granularity != 0 /* byte limit */
2032	)
2033	{
2034	AssertFailed();
2035	return false;
2036	}
2037	# endif
2038	return true;
2039	}
2040	# endif /* VBOX_WITH_SAFE_STR */
2041
2042	#endif /* VBOX_WITH_RAW_MODE */
2043
2044	/**
2045	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2046	*
2047	* See SELMR3GetSelectorInfo for details.
2048	*
2049	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2050	*
2051	* @param pVCpu Pointer to the VMCPU.
2052	* @param Sel The selector to get info about.
2053	* @param pSelInfo Where to store the information.
2054	*/
2055	static int selmR3GetSelectorInfo64(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2056	{
2057	/*
2058	* Read it from the guest descriptor table.
2059	*/
2060	/** @todo this is bogus wrt the LDT/GDT limit on long selectors. */
2061	X86DESC64 Desc;
2062	RTGCPTR GCPtrDesc;
2063	if (!(Sel & X86_SEL_LDT))
2064	{
2065	/* GDT */
2066	VBOXGDTR Gdtr;
2067	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2068	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
2069	return VERR_INVALID_SELECTOR;
2070	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2071	}
2072	else
2073	{
2074	/* LDT */
2075	uint64_t GCPtrBase;
2076	uint32_t cbLimit;
2077	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
2078	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
2079	return VERR_INVALID_SELECTOR;
2080
2081	/* calc the descriptor location. */
2082	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
2083	}
2084
2085	/* read the descriptor. */
2086	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2087	if (RT_FAILURE(rc))
2088	{
2089	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
2090	if (RT_FAILURE(rc))
2091	return rc;
2092	Desc.au64[1] = 0;
2093	}
2094
2095	/*
2096	* Extract the base and limit
2097	* (We ignore the present bit here, which is probably a bit silly...)
2098	*/
2099	pSelInfo->Sel = Sel;
2100	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
2101	pSelInfo->u.Raw64 = Desc;
2102	if (Desc.Gen.u1DescType)
2103	{
2104	/*
2105	* 64-bit code selectors are wide open, it's not possible to detect
2106	* 64-bit data or stack selectors without also dragging in assumptions
2107	* about current CS (i.e. that's we're executing in 64-bit mode). So,
2108	* the selinfo user needs to deal with this in the context the info is
2109	* used unfortunately.
2110	*/
2111	if ( Desc.Gen.u1Long
2112	&& !Desc.Gen.u1DefBig
2113	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
2114	{
2115	/* Note! We ignore the segment limit hacks that was added by AMD. */
2116	pSelInfo->GCPtrBase = 0;
2117	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
2118	}
2119	else
2120	{
2121	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
2122	pSelInfo->GCPtrBase = X86DESC_BASE(&Desc);
2123	}
2124	pSelInfo->SelGate = 0;
2125	}
2126	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
2127	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
2128	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
2129	{
2130	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
2131	in the AMD manual here as a simplification. */
2132	pSelInfo->GCPtrBase = X86DESC64_BASE(&Desc);
2133	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
2134	pSelInfo->SelGate = 0;
2135	}
2136	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
2137	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
2138	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
2139	{
2140	pSelInfo->cbLimit = X86DESC64_BASE(&Desc);
2141	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
2142	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
2143	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
2144	pSelInfo->SelGate = Desc.Gate.u16Sel;
2145	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2146	}
2147	else
2148	{
2149	pSelInfo->cbLimit = 0;
2150	pSelInfo->GCPtrBase = 0;
2151	pSelInfo->SelGate = 0;
2152	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2153	}
2154	if (!Desc.Gen.u1Present)
2155	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2156
2157	return VINF_SUCCESS;
2158	}
2159
2160
2161	/**
2162	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
2163	* interprets a legacy descriptor table entry and fills in the selector info
2164	* structure from it.
2165	*
2166	* @param pSelInfo Where to store the selector info. Only the fFlags and
2167	* Sel members have been initialized.
2168	* @param pDesc The legacy descriptor to parse.
2169	*/
2170	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
2171	{
2172	pSelInfo->u.Raw64.au64[1] = 0;
2173	pSelInfo->u.Raw = *pDesc;
2174	if ( pDesc->Gen.u1DescType
2175	\|\| !(pDesc->Gen.u4Type & 4))
2176	{
2177	pSelInfo->cbLimit = X86DESC_LIMIT_G(pDesc);
2178	pSelInfo->GCPtrBase = X86DESC_BASE(pDesc);
2179	pSelInfo->SelGate = 0;
2180	}
2181	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
2182	{
2183	pSelInfo->cbLimit = 0;
2184	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
2185	pSelInfo->GCPtrBase = 0;
2186	else
2187	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
2188	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
2189	pSelInfo->SelGate = pDesc->Gate.u16Sel;
2190	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
2191	}
2192	else
2193	{
2194	pSelInfo->cbLimit = 0;
2195	pSelInfo->GCPtrBase = 0;
2196	pSelInfo->SelGate = 0;
2197	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
2198	}
2199	if (!pDesc->Gen.u1Present)
2200	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
2201	}
2202
2203
2204	/**
2205	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
2206	*
2207	* See SELMR3GetSelectorInfo for details.
2208	*
2209	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
2210	*
2211	* @param pVM Pointer to the VM.
2212	* @param pVCpu Pointer to the VMCPU.
2213	* @param Sel The selector to get info about.
2214	* @param pSelInfo Where to store the information.
2215	*/
2216	static int selmR3GetSelectorInfo32(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2217	{
2218	/*
2219	* Read the descriptor entry
2220	*/
2221	pSelInfo->fFlags = 0;
2222	X86DESC Desc;
2223	if ( !(Sel & X86_SEL_LDT)
2224	&& ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_RPL_LDT)
2225	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_RPL_LDT)
2226	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_RPL_LDT)
2227	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_RPL_LDT)
2228	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_RPL_LDT))
2229	)
2230	{
2231	/*
2232	* Hypervisor descriptor.
2233	*/
2234	pSelInfo->fFlags = DBGFSELINFO_FLAGS_HYPER;
2235	if (CPUMIsGuestInProtectedMode(pVCpu))
2236	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2237	else
2238	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2239
2240	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2241	}
2242	else if (CPUMIsGuestInProtectedMode(pVCpu))
2243	{
2244	/*
2245	* Read it from the guest descriptor table.
2246	*/
2247	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
2248
2249	RTGCPTR GCPtrDesc;
2250	if (!(Sel & X86_SEL_LDT))
2251	{
2252	/* GDT */
2253	VBOXGDTR Gdtr;
2254	CPUMGetGuestGDTR(pVCpu, &Gdtr);
2255	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
2256	return VERR_INVALID_SELECTOR;
2257	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
2258	}
2259	else
2260	{
2261	/* LDT */
2262	uint64_t GCPtrBase;
2263	uint32_t cbLimit;
2264	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
2265	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
2266	return VERR_INVALID_SELECTOR;
2267
2268	/* calc the descriptor location. */
2269	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
2270	}
2271
2272	/* read the descriptor. */
2273	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
2274	if (RT_FAILURE(rc))
2275	return rc;
2276	}
2277	else
2278	{
2279	/*
2280	* We're in real mode.
2281	*/
2282	pSelInfo->Sel = Sel;
2283	pSelInfo->GCPtrBase = Sel << 4;
2284	pSelInfo->cbLimit = 0xffff;
2285	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
2286	pSelInfo->u.Raw64.au64[0] = 0;
2287	pSelInfo->u.Raw64.au64[1] = 0;
2288	pSelInfo->SelGate = 0;
2289	return VINF_SUCCESS;
2290	}
2291
2292	/*
2293	* Extract the base and limit or sel:offset for gates.
2294	*/
2295	pSelInfo->Sel = Sel;
2296	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2297
2298	return VINF_SUCCESS;
2299	}
2300
2301
2302	/**
2303	* Gets information about a selector.
2304	*
2305	* Intended for the debugger mostly and will prefer the guest descriptor tables
2306	* over the shadow ones.
2307	*
2308	* @retval VINF_SUCCESS on success.
2309	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2310	* descriptor table.
2311	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2312	* is not returned if the selector itself isn't present, you have to
2313	* check that for yourself (see DBGFSELINFO::fFlags).
2314	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2315	* pagetable or page backing the selector table wasn't present.
2316	* @returns Other VBox status code on other errors.
2317	*
2318	* @param pVM Pointer to the VM.
2319	* @param pVCpu Pointer to the VMCPU.
2320	* @param Sel The selector to get info about.
2321	* @param pSelInfo Where to store the information.
2322	*/
2323	VMMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
2324	{
2325	AssertPtr(pSelInfo);
2326	if (CPUMIsGuestInLongMode(pVCpu))
2327	return selmR3GetSelectorInfo64(pVCpu, Sel, pSelInfo);
2328	return selmR3GetSelectorInfo32(pVM, pVCpu, Sel, pSelInfo);
2329	}
2330
2331
2332	/**
2333	* Gets information about a selector from the shadow tables.
2334	*
2335	* This is intended to be faster than the SELMR3GetSelectorInfo() method, but
2336	* requires that the caller ensures that the shadow tables are up to date.
2337	*
2338	* @retval VINF_SUCCESS on success.
2339	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
2340	* descriptor table.
2341	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
2342	* is not returned if the selector itself isn't present, you have to
2343	* check that for yourself (see DBGFSELINFO::fFlags).
2344	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
2345	* pagetable or page backing the selector table wasn't present.
2346	* @returns Other VBox status code on other errors.
2347	*
2348	* @param pVM Pointer to the VM.
2349	* @param Sel The selector to get info about.
2350	* @param pSelInfo Where to store the information.
2351	*
2352	* @remarks Don't use this when in hardware assisted virtualization mode.
2353	*/
2354	VMMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PDBGFSELINFO pSelInfo)
2355	{
2356	Assert(pSelInfo);
2357
2358	/*
2359	* Read the descriptor entry
2360	*/
2361	X86DESC Desc;
2362	if (!(Sel & X86_SEL_LDT))
2363	{
2364	/*
2365	* Global descriptor.
2366	*/
2367	Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
2368	pSelInfo->fFlags = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK_OFF_RPL)
2369	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK_OFF_RPL)
2370	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK_OFF_RPL)
2371	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK_OFF_RPL)
2372	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK_OFF_RPL)
2373	? DBGFSELINFO_FLAGS_HYPER
2374	: 0;
2375	/** @todo check that the GDT offset is valid. */
2376	}
2377	else
2378	{
2379	/*
2380	* Local Descriptor.
2381	*/
2382	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2383	Desc = paLDT[Sel >> X86_SEL_SHIFT];
2384	/** @todo check if the LDT page is actually available. */
2385	/** @todo check that the LDT offset is valid. */
2386	pSelInfo->fFlags = 0;
2387	}
2388	if (CPUMIsGuestInProtectedMode(VMMGetCpu0(pVM)))
2389	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_PROT_MODE;
2390	else
2391	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_REAL_MODE;
2392
2393	/*
2394	* Extract the base and limit or sel:offset for gates.
2395	*/
2396	pSelInfo->Sel = Sel;
2397	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
2398
2399	return VINF_SUCCESS;
2400	}
2401
2402
2403	/**
2404	* Formats a descriptor.
2405	*
2406	* @param Desc Descriptor to format.
2407	* @param Sel Selector number.
2408	* @param pszOutput Output buffer.
2409	* @param cchOutput Size of output buffer.
2410	*/
2411	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
2412	{
2413	/*
2414	* Make variable description string.
2415	*/
2416	static struct
2417	{
2418	unsigned cch;
2419	const char *psz;
2420	} const aTypes[32] =
2421	{
2422	#define STRENTRY(str) { sizeof(str) - 1, str }
2423	/* system */
2424	STRENTRY("Reserved0 "), /* 0x00 */
2425	STRENTRY("TSS16Avail "), /* 0x01 */
2426	STRENTRY("LDT "), /* 0x02 */
2427	STRENTRY("TSS16Busy "), /* 0x03 */
2428	STRENTRY("Call16 "), /* 0x04 */
2429	STRENTRY("Task "), /* 0x05 */
2430	STRENTRY("Int16 "), /* 0x06 */
2431	STRENTRY("Trap16 "), /* 0x07 */
2432	STRENTRY("Reserved8 "), /* 0x08 */
2433	STRENTRY("TSS32Avail "), /* 0x09 */
2434	STRENTRY("ReservedA "), /* 0x0a */
2435	STRENTRY("TSS32Busy "), /* 0x0b */
2436	STRENTRY("Call32 "), /* 0x0c */
2437	STRENTRY("ReservedD "), /* 0x0d */
2438	STRENTRY("Int32 "), /* 0x0e */
2439	STRENTRY("Trap32 "), /* 0x0f */
2440	/* non system */
2441	STRENTRY("DataRO "), /* 0x10 */
2442	STRENTRY("DataRO Accessed "), /* 0x11 */
2443	STRENTRY("DataRW "), /* 0x12 */
2444	STRENTRY("DataRW Accessed "), /* 0x13 */
2445	STRENTRY("DataDownRO "), /* 0x14 */
2446	STRENTRY("DataDownRO Accessed "), /* 0x15 */
2447	STRENTRY("DataDownRW "), /* 0x16 */
2448	STRENTRY("DataDownRW Accessed "), /* 0x17 */
2449	STRENTRY("CodeEO "), /* 0x18 */
2450	STRENTRY("CodeEO Accessed "), /* 0x19 */
2451	STRENTRY("CodeER "), /* 0x1a */
2452	STRENTRY("CodeER Accessed "), /* 0x1b */
2453	STRENTRY("CodeConfEO "), /* 0x1c */
2454	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
2455	STRENTRY("CodeConfER "), /* 0x1e */
2456	STRENTRY("CodeConfER Accessed ") /* 0x1f */
2457	#undef SYSENTRY
2458	};
2459	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
2460	char szMsg[128];
2461	char *psz = &szMsg[0];
2462	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
2463	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
2464	psz += aTypes[i].cch;
2465
2466	if (Desc.Gen.u1Present)
2467	ADD_STR(psz, "Present ");
2468	else
2469	ADD_STR(psz, "Not-Present ");
2470	if (Desc.Gen.u1Granularity)
2471	ADD_STR(psz, "Page ");
2472	if (Desc.Gen.u1DefBig)
2473	ADD_STR(psz, "32-bit ");
2474	else
2475	ADD_STR(psz, "16-bit ");
2476	#undef ADD_STR
2477	*psz = '\0';
2478
2479	/*
2480	* Limit and Base and format the output.
2481	*/
2482	uint32_t u32Limit = X86DESC_LIMIT_G(&Desc);
2483	uint32_t u32Base = X86DESC_BASE(&Desc);
2484
2485	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
2486	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
2487	}
2488
2489
2490	/**
2491	* Dumps a descriptor.
2492	*
2493	* @param Desc Descriptor to dump.
2494	* @param Sel Selector number.
2495	* @param pszMsg Message to prepend the log entry with.
2496	*/
2497	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
2498	{
2499	char szOutput[128];
2500	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
2501	Log(("%s: %s\n", pszMsg, szOutput));
2502	NOREF(szOutput[0]);
2503	}
2504
2505
2506	/**
2507	* Display the shadow gdt.
2508	*
2509	* @param pVM Pointer to the VM.
2510	* @param pHlp The info helpers.
2511	* @param pszArgs Arguments, ignored.
2512	*/
2513	static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2514	{
2515	NOREF(pszArgs);
2516	pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%RRv):\n", MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3));
2517	for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
2518	{
2519	if (pVM->selm.s.paGdtR3[iGDT].Gen.u1Present)
2520	{
2521	char szOutput[128];
2522	selmR3FormatDescriptor(pVM->selm.s.paGdtR3[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2523	const char *psz = "";
2524	if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> X86_SEL_SHIFT))
2525	psz = " HyperCS";
2526	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> X86_SEL_SHIFT))
2527	psz = " HyperDS";
2528	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> X86_SEL_SHIFT))
2529	psz = " HyperCS64";
2530	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> X86_SEL_SHIFT))
2531	psz = " HyperTSS";
2532	else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
2533	psz = " HyperTSSTrap08";
2534	pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
2535	}
2536	}
2537	}
2538
2539
2540	/**
2541	* Display the guest gdt.
2542	*
2543	* @param pVM Pointer to the VM.
2544	* @param pHlp The info helpers.
2545	* @param pszArgs Arguments, ignored.
2546	*/
2547	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2548	{
2549	/** @todo SMP support! */
2550	PVMCPU pVCpu = &pVM->aCpus[0];
2551
2552	VBOXGDTR GDTR;
2553	CPUMGetGuestGDTR(pVCpu, &GDTR);
2554	RTGCPTR GCPtrGDT = GDTR.pGdt;
2555	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
2556
2557	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
2558	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
2559	{
2560	X86DESC GDTE;
2561	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
2562	if (RT_SUCCESS(rc))
2563	{
2564	if (GDTE.Gen.u1Present)
2565	{
2566	char szOutput[128];
2567	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
2568	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2569	}
2570	}
2571	else if (rc == VERR_PAGE_NOT_PRESENT)
2572	{
2573	if ((GCPtrGDT & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2574	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
2575	}
2576	else
2577	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
2578	}
2579	NOREF(pszArgs);
2580	}
2581
2582
2583	/**
2584	* Display the shadow ldt.
2585	*
2586	* @param pVM Pointer to the VM.
2587	* @param pHlp The info helpers.
2588	* @param pszArgs Arguments, ignored.
2589	*/
2590	static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2591	{
2592	unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
2593	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
2594	pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%RRv limit=%#x):\n", pVM->selm.s.pvLdtRC + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
2595	for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
2596	{
2597	if (paLDT[iLDT].Gen.u1Present)
2598	{
2599	char szOutput[128];
2600	selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2601	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2602	}
2603	}
2604	NOREF(pszArgs);
2605	}
2606
2607
2608	/**
2609	* Display the guest ldt.
2610	*
2611	* @param pVM Pointer to the VM.
2612	* @param pHlp The info helpers.
2613	* @param pszArgs Arguments, ignored.
2614	*/
2615	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
2616	{
2617	/** @todo SMP support! */
2618	PVMCPU pVCpu = &pVM->aCpus[0];
2619
2620	uint64_t GCPtrLdt;
2621	uint32_t cbLdt;
2622	RTSEL SelLdt = CPUMGetGuestLdtrEx(pVCpu, &GCPtrLdt, &cbLdt);
2623	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
2624	{
2625	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
2626	return;
2627	}
2628
2629	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RX64 limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
2630	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
2631	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
2632	{
2633	X86DESC LdtE;
2634	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
2635	if (RT_SUCCESS(rc))
2636	{
2637	if (LdtE.Gen.u1Present)
2638	{
2639	char szOutput[128];
2640	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
2641	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
2642	}
2643	}
2644	else if (rc == VERR_PAGE_NOT_PRESENT)
2645	{
2646	if ((GCPtrLdt & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
2647	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
2648	}
2649	else
2650	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
2651	}
2652	NOREF(pszArgs);
2653	}
2654
2655
2656	/**
2657	* Dumps the hypervisor GDT
2658	*
2659	* @param pVM Pointer to the VM.
2660	*/
2661	VMMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
2662	{
2663	DBGFR3Info(pVM->pUVM, "gdt", NULL, NULL);
2664	}
2665
2666
2667	/**
2668	* Dumps the hypervisor LDT
2669	*
2670	* @param pVM Pointer to the VM.
2671	*/
2672	VMMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
2673	{
2674	DBGFR3Info(pVM->pUVM, "ldt", NULL, NULL);
2675	}
2676
2677
2678	/**
2679	* Dumps the guest GDT
2680	*
2681	* @param pVM Pointer to the VM.
2682	*/
2683	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
2684	{
2685	DBGFR3Info(pVM->pUVM, "gdtguest", NULL, NULL);
2686	}
2687
2688
2689	/**
2690	* Dumps the guest LDT
2691	*
2692	* @param pVM Pointer to the VM.
2693	*/
2694	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
2695	{
2696	DBGFR3Info(pVM->pUVM, "ldtguest", NULL, NULL);
2697	}
2698

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source: vbox/trunk/src/VBox/VMM/VMMR3/SELM.cpp@ 56085

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