SELM.cpp@ 94617

Last change on this file since 94617 was 93554, checked in by vboxsync, 3 years ago
VMM: Changed PAGE_SIZE -> GUEST_PAGE_SIZE / HOST_PAGE_SIZE, PAGE_SHIFT -> GUEST_PAGE_SHIFT / HOST_PAGE_SHIFT, and PAGE_OFFSET_MASK -> GUEST_PAGE_OFFSET_MASK / HOST_PAGE_OFFSET_MASK. Also removed most usage of ASMMemIsZeroPage and ASMMemZeroPage since the host and guest page size doesn't need to be the same any more. Some work left to do in the page pool code. bugref:9898
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 23.3 KB

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1	/* $Id: SELM.cpp 93554 2022-02-02 22:57:02Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_selm SELM - The Selector Manager
19	*
20	* SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
21	* of a few hyper selector for the raw-mode context. In the hardware assisted
22	* virtualization mode its only task is to decode entries in the guest GDT or
23	* LDT once in a while.
24	*
25	* @see grp_selm
26	*
27	*
28	* @section seg_selm_shadowing Shadowing
29	*
30	* SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
31	* work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
32	* The idea is to do it in a more on-demand fashion when we get time. There
33	* also a whole bunch of issues with the current synchronization of all three
34	* tables, see notes and todos in the code.
35	*
36	* When the guest makes changes to the GDT we will try update the shadow copy
37	* without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
38	*
39	* When the guest make LDT changes we'll trigger a full resync of the LDT
40	* (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
41	*
42	* The TSS shadowing is limited to the fields we need to care about, namely SS0
43	* and ESP0. The Patch Manager makes use of these. We monitor updates to the
44	* guest TSS and will try keep our SS0 and ESP0 copies up to date this way
45	* rather than go the SELMR3SyncTSS() route.
46	*
47	* When in raw-mode SELM also injects a few extra GDT selectors which are used
48	* by the raw-mode (hyper) context. These start their life at the high end of
49	* the table and will be relocated when the guest tries to make use of them...
50	* Well, that was that idea at least, only the code isn't quite there yet which
51	* is why we have trouble with guests which actually have a full sized GDT.
52	*
53	* So, the summary of the current GDT, LDT and TSS shadowing is that there is a
54	* lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
55	*
56	*/
57
58
59	/*********************************************************************************************************************************
60	* Header Files *
61	*********************************************************************************************************************************/
62	#define LOG_GROUP LOG_GROUP_SELM
63	#include <VBox/vmm/selm.h>
64	#include <VBox/vmm/cpum.h>
65	#include <VBox/vmm/stam.h>
66	#include <VBox/vmm/em.h>
67	#include <VBox/vmm/hm.h>
68	#include <VBox/vmm/mm.h>
69	#include <VBox/vmm/ssm.h>
70	#include <VBox/vmm/pgm.h>
71	#include <VBox/vmm/trpm.h>
72	#include <VBox/vmm/dbgf.h>
73	#include "SELMInternal.h"
74	#include <VBox/vmm/vm.h>
75	#include <VBox/err.h>
76	#include <VBox/param.h>
77
78	#include <iprt/assert.h>
79	#include <VBox/log.h>
80	#include <iprt/asm.h>
81	#include <iprt/string.h>
82	#include <iprt/thread.h>
83	#include <iprt/string.h>
84
85
86	/*********************************************************************************************************************************
87	* Internal Functions *
88	*********************************************************************************************************************************/
89	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
90	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
91	//static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
92
93
94
95	/**
96	* Initializes the SELM.
97	*
98	* @returns VBox status code.
99	* @param pVM The cross context VM structure.
100	*/
101	VMMR3DECL(int) SELMR3Init(PVM pVM)
102	{
103	int rc;
104	LogFlow(("SELMR3Init\n"));
105
106	/*
107	* Assert alignment and sizes.
108	* (The TSS block requires contiguous back.)
109	*/
110	AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
111	AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_UOFFSETOF(VM, selm.s) & 31));
112
113	/*
114	* Register the saved state data unit.
115	*/
116	rc = SSMR3RegisterStub(pVM, "selm", 1);
117	if (RT_FAILURE(rc))
118	return rc;
119
120	/*
121	* Statistics.
122	*/
123	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelGst, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from guest tables.");
124	STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelShw, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedShadow", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from shadow tables.");
125	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelReadErrors, STAMTYPE_COUNTER, "/SELM/LoadHidSel/GstReadErrors", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Guest table read errors.");
126	STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelGstNoGood, STAMTYPE_COUNTER, "/SELM/LoadHidSel/NoGoodGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: No good guest table entry.");
127
128	/*
129	* Register info handlers.
130	*/
131	DBGFR3InfoRegisterInternalEx(pVM, "gdt", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
132	DBGFR3InfoRegisterInternalEx(pVM, "ldt", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
133	//DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest, DBGFINFO_FLAGS_RUN_ON_EMT);
134
135	return rc;
136	}
137
138
139	/**
140	* Applies relocations to data and code managed by this
141	* component. This function will be called at init and
142	* whenever the VMM need to relocate it self inside the GC.
143	*
144	* @param pVM The cross context VM structure.
145	*/
146	VMMR3DECL(void) SELMR3Relocate(PVM pVM)
147	{
148	LogFlow(("SELMR3Relocate\n"));
149	RT_NOREF(pVM);
150	}
151
152
153	/**
154	* Terminates the SELM.
155	*
156	* Termination means cleaning up and freeing all resources,
157	* the VM it self is at this point powered off or suspended.
158	*
159	* @returns VBox status code.
160	* @param pVM The cross context VM structure.
161	*/
162	VMMR3DECL(int) SELMR3Term(PVM pVM)
163	{
164	NOREF(pVM);
165	return VINF_SUCCESS;
166	}
167
168
169	/**
170	* The VM is being reset.
171	*
172	* For the SELM component this means that any GDT/LDT/TSS monitors
173	* needs to be removed.
174	*
175	* @param pVM The cross context VM structure.
176	*/
177	VMMR3DECL(void) SELMR3Reset(PVM pVM)
178	{
179	LogFlow(("SELMR3Reset:\n"));
180	VM_ASSERT_EMT(pVM);
181	RT_NOREF(pVM);
182	}
183
184
185	/**
186	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
187	*
188	* See SELMR3GetSelectorInfo for details.
189	*
190	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
191	*
192	* @param pVCpu The cross context virtual CPU structure.
193	* @param Sel The selector to get info about.
194	* @param pSelInfo Where to store the information.
195	*/
196	static int selmR3GetSelectorInfo64(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
197	{
198	/*
199	* Read it from the guest descriptor table.
200	*/
201	/** @todo this is bogus wrt the LDT/GDT limit on long selectors. */
202	X86DESC64 Desc;
203	RTGCPTR GCPtrDesc;
204	if (!(Sel & X86_SEL_LDT))
205	{
206	/* GDT */
207	VBOXGDTR Gdtr;
208	CPUMGetGuestGDTR(pVCpu, &Gdtr);
209	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
210	return VERR_INVALID_SELECTOR;
211	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
212	}
213	else
214	{
215	/* LDT */
216	uint64_t GCPtrBase;
217	uint32_t cbLimit;
218	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
219	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
220	return VERR_INVALID_SELECTOR;
221
222	/* calc the descriptor location. */
223	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
224	}
225
226	/* read the descriptor. */
227	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
228	if (RT_FAILURE(rc))
229	{
230	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
231	if (RT_FAILURE(rc))
232	return rc;
233	Desc.au64[1] = 0;
234	}
235
236	/*
237	* Extract the base and limit
238	* (We ignore the present bit here, which is probably a bit silly...)
239	*/
240	pSelInfo->Sel = Sel;
241	pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
242	pSelInfo->u.Raw64 = Desc;
243	if (Desc.Gen.u1DescType)
244	{
245	/*
246	* 64-bit code selectors are wide open, it's not possible to detect
247	* 64-bit data or stack selectors without also dragging in assumptions
248	* about current CS (i.e. that's we're executing in 64-bit mode). So,
249	* the selinfo user needs to deal with this in the context the info is
250	* used unfortunately.
251	*/
252	if ( Desc.Gen.u1Long
253	&& !Desc.Gen.u1DefBig
254	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
255	{
256	/* Note! We ignore the segment limit hacks that was added by AMD. */
257	pSelInfo->GCPtrBase = 0;
258	pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
259	}
260	else
261	{
262	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
263	pSelInfo->GCPtrBase = X86DESC_BASE(&Desc);
264	}
265	pSelInfo->SelGate = 0;
266	}
267	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
268	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
269	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
270	{
271	/* Note. LDT descriptors are weird in long mode, we ignore the footnote
272	in the AMD manual here as a simplification. */
273	pSelInfo->GCPtrBase = X86DESC64_BASE(&Desc);
274	pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
275	pSelInfo->SelGate = 0;
276	}
277	else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
278	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
279	\|\| Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
280	{
281	pSelInfo->cbLimit = X86DESC64_BASE(&Desc);
282	pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
283	\| ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
284	\| ((uint64_t)Desc.Gate.u32OffsetTop << 32);
285	pSelInfo->SelGate = Desc.Gate.u16Sel;
286	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
287	}
288	else
289	{
290	pSelInfo->cbLimit = 0;
291	pSelInfo->GCPtrBase = 0;
292	pSelInfo->SelGate = 0;
293	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
294	}
295	if (!Desc.Gen.u1Present)
296	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
297
298	return VINF_SUCCESS;
299	}
300
301
302	/**
303	* Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
304	* interprets a legacy descriptor table entry and fills in the selector info
305	* structure from it.
306	*
307	* @param pSelInfo Where to store the selector info. Only the fFlags and
308	* Sel members have been initialized.
309	* @param pDesc The legacy descriptor to parse.
310	*/
311	DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
312	{
313	pSelInfo->u.Raw64.au64[1] = 0;
314	pSelInfo->u.Raw = *pDesc;
315	if ( pDesc->Gen.u1DescType
316	\|\| !(pDesc->Gen.u4Type & 4))
317	{
318	pSelInfo->cbLimit = X86DESC_LIMIT_G(pDesc);
319	pSelInfo->GCPtrBase = X86DESC_BASE(pDesc);
320	pSelInfo->SelGate = 0;
321	}
322	else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
323	{
324	pSelInfo->cbLimit = 0;
325	if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
326	pSelInfo->GCPtrBase = 0;
327	else
328	pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
329	\| (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
330	pSelInfo->SelGate = pDesc->Gate.u16Sel;
331	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_GATE;
332	}
333	else
334	{
335	pSelInfo->cbLimit = 0;
336	pSelInfo->GCPtrBase = 0;
337	pSelInfo->SelGate = 0;
338	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_INVALID;
339	}
340	if (!pDesc->Gen.u1Present)
341	pSelInfo->fFlags \|= DBGFSELINFO_FLAGS_NOT_PRESENT;
342	}
343
344
345	/**
346	* Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
347	*
348	* See SELMR3GetSelectorInfo for details.
349	*
350	* @returns VBox status code, see SELMR3GetSelectorInfo for details.
351	*
352	* @param pVCpu The cross context virtual CPU structure.
353	* @param Sel The selector to get info about.
354	* @param pSelInfo Where to store the information.
355	*/
356	static int selmR3GetSelectorInfo32(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
357	{
358	/*
359	* Read the descriptor entry
360	*/
361	pSelInfo->fFlags = 0;
362	if (CPUMIsGuestInProtectedMode(pVCpu))
363	{
364	/*
365	* Read it from the guest descriptor table.
366	*/
367	pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
368
369	RTGCPTR GCPtrDesc;
370	if (!(Sel & X86_SEL_LDT))
371	{
372	/* GDT */
373	VBOXGDTR Gdtr;
374	CPUMGetGuestGDTR(pVCpu, &Gdtr);
375	if ((Sel \| X86_SEL_RPL_LDT) > Gdtr.cbGdt)
376	return VERR_INVALID_SELECTOR;
377	GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
378	}
379	else
380	{
381	/* LDT */
382	uint64_t GCPtrBase;
383	uint32_t cbLimit;
384	CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
385	if ((Sel \| X86_SEL_RPL_LDT) > cbLimit)
386	return VERR_INVALID_SELECTOR;
387
388	/* calc the descriptor location. */
389	GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
390	}
391
392	/* read the descriptor. */
393	X86DESC Desc;
394	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
395	if (RT_SUCCESS(rc))
396	{
397	/*
398	* Extract the base and limit or sel:offset for gates.
399	*/
400	pSelInfo->Sel = Sel;
401	selmR3SelInfoFromDesc32(pSelInfo, &Desc);
402
403	return VINF_SUCCESS;
404	}
405	return rc;
406	}
407
408	/*
409	* We're in real mode.
410	*/
411	pSelInfo->Sel = Sel;
412	pSelInfo->GCPtrBase = Sel << 4;
413	pSelInfo->cbLimit = 0xffff;
414	pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
415	pSelInfo->u.Raw64.au64[0] = 0;
416	pSelInfo->u.Raw64.au64[1] = 0;
417	pSelInfo->SelGate = 0;
418	return VINF_SUCCESS;
419	}
420
421
422	/**
423	* Gets information about a selector.
424	*
425	* Intended for the debugger mostly and will prefer the guest descriptor tables
426	* over the shadow ones.
427	*
428	* @retval VINF_SUCCESS on success.
429	* @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
430	* descriptor table.
431	* @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
432	* is not returned if the selector itself isn't present, you have to
433	* check that for yourself (see DBGFSELINFO::fFlags).
434	* @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
435	* pagetable or page backing the selector table wasn't present.
436	* @returns Other VBox status code on other errors.
437	*
438	* @param pVCpu The cross context virtual CPU structure.
439	* @param Sel The selector to get info about.
440	* @param pSelInfo Where to store the information.
441	*/
442	VMMR3DECL(int) SELMR3GetSelectorInfo(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
443	{
444	AssertPtr(pSelInfo);
445	if (CPUMIsGuestInLongMode(pVCpu))
446	return selmR3GetSelectorInfo64(pVCpu, Sel, pSelInfo);
447	return selmR3GetSelectorInfo32(pVCpu, Sel, pSelInfo);
448	}
449
450
451	/**
452	* Formats a descriptor.
453	*
454	* @param Desc Descriptor to format.
455	* @param Sel Selector number.
456	* @param pszOutput Output buffer.
457	* @param cchOutput Size of output buffer.
458	*/
459	static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
460	{
461	/*
462	* Make variable description string.
463	*/
464	static struct
465	{
466	unsigned cch;
467	const char *psz;
468	} const aTypes[32] =
469	{
470	#define STRENTRY(str) { sizeof(str) - 1, str }
471	/* system */
472	STRENTRY("Reserved0 "), /* 0x00 */
473	STRENTRY("TSS16Avail "), /* 0x01 */
474	STRENTRY("LDT "), /* 0x02 */
475	STRENTRY("TSS16Busy "), /* 0x03 */
476	STRENTRY("Call16 "), /* 0x04 */
477	STRENTRY("Task "), /* 0x05 */
478	STRENTRY("Int16 "), /* 0x06 */
479	STRENTRY("Trap16 "), /* 0x07 */
480	STRENTRY("Reserved8 "), /* 0x08 */
481	STRENTRY("TSS32Avail "), /* 0x09 */
482	STRENTRY("ReservedA "), /* 0x0a */
483	STRENTRY("TSS32Busy "), /* 0x0b */
484	STRENTRY("Call32 "), /* 0x0c */
485	STRENTRY("ReservedD "), /* 0x0d */
486	STRENTRY("Int32 "), /* 0x0e */
487	STRENTRY("Trap32 "), /* 0x0f */
488	/* non system */
489	STRENTRY("DataRO "), /* 0x10 */
490	STRENTRY("DataRO Accessed "), /* 0x11 */
491	STRENTRY("DataRW "), /* 0x12 */
492	STRENTRY("DataRW Accessed "), /* 0x13 */
493	STRENTRY("DataDownRO "), /* 0x14 */
494	STRENTRY("DataDownRO Accessed "), /* 0x15 */
495	STRENTRY("DataDownRW "), /* 0x16 */
496	STRENTRY("DataDownRW Accessed "), /* 0x17 */
497	STRENTRY("CodeEO "), /* 0x18 */
498	STRENTRY("CodeEO Accessed "), /* 0x19 */
499	STRENTRY("CodeER "), /* 0x1a */
500	STRENTRY("CodeER Accessed "), /* 0x1b */
501	STRENTRY("CodeConfEO "), /* 0x1c */
502	STRENTRY("CodeConfEO Accessed "), /* 0x1d */
503	STRENTRY("CodeConfER "), /* 0x1e */
504	STRENTRY("CodeConfER Accessed ") /* 0x1f */
505	#undef SYSENTRY
506	};
507	#define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
508	char szMsg[128];
509	char *psz = &szMsg[0];
510	unsigned i = Desc.Gen.u1DescType << 4 \| Desc.Gen.u4Type;
511	memcpy(psz, aTypes[i].psz, aTypes[i].cch);
512	psz += aTypes[i].cch;
513
514	if (Desc.Gen.u1Present)
515	ADD_STR(psz, "Present ");
516	else
517	ADD_STR(psz, "Not-Present ");
518	if (Desc.Gen.u1Granularity)
519	ADD_STR(psz, "Page ");
520	if (Desc.Gen.u1DefBig)
521	ADD_STR(psz, "32-bit ");
522	else
523	ADD_STR(psz, "16-bit ");
524	#undef ADD_STR
525	*psz = '\0';
526
527	/*
528	* Limit and Base and format the output.
529	*/
530	uint32_t u32Limit = X86DESC_LIMIT_G(&Desc);
531	uint32_t u32Base = X86DESC_BASE(&Desc);
532
533	RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
534	Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
535	}
536
537
538	/**
539	* Dumps a descriptor.
540	*
541	* @param Desc Descriptor to dump.
542	* @param Sel Selector number.
543	* @param pszMsg Message to prepend the log entry with.
544	*/
545	VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
546	{
547	#ifdef LOG_ENABLED
548	if (LogIsEnabled())
549	{
550	char szOutput[128];
551	selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
552	Log(("%s: %s\n", pszMsg, szOutput));
553	}
554	#else
555	RT_NOREF3(Desc, Sel, pszMsg);
556	#endif
557	}
558
559
560	/**
561	* Display the guest gdt.
562	*
563	* @param pVM The cross context VM structure.
564	* @param pHlp The info helpers.
565	* @param pszArgs Arguments, ignored.
566	*/
567	static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
568	{
569	/** @todo SMP support! */
570	PVMCPU pVCpu = VMMGetCpu(pVM);
571	CPUMImportGuestStateOnDemand(pVCpu, CPUMCTX_EXTRN_CR0 \| CPUMCTX_EXTRN_CR3 \| CPUMCTX_EXTRN_CR4
572	\| CPUMCTX_EXTRN_EFER \| CPUMCTX_EXTRN_GDTR);
573
574	VBOXGDTR GDTR;
575	CPUMGetGuestGDTR(pVCpu, &GDTR);
576	RTGCPTR GCPtrGDT = GDTR.pGdt;
577	unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
578
579	pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
580	for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
581	{
582	X86DESC GDTE;
583	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
584	if (RT_SUCCESS(rc))
585	{
586	if (GDTE.Gen.u1Present)
587	{
588	char szOutput[128];
589	selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
590	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
591	}
592	}
593	else if (rc == VERR_PAGE_NOT_PRESENT)
594	{
595	if ((GCPtrGDT & GUEST_PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
596	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
597	}
598	else
599	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
600	}
601	NOREF(pszArgs);
602	}
603
604
605	/**
606	* Display the guest ldt.
607	*
608	* @param pVM The cross context VM structure.
609	* @param pHlp The info helpers.
610	* @param pszArgs Arguments, ignored.
611	*/
612	static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
613	{
614	/** @todo SMP support! */
615	PVMCPU pVCpu = VMMGetCpu(pVM);
616	CPUMImportGuestStateOnDemand(pVCpu, CPUMCTX_EXTRN_CR0 \| CPUMCTX_EXTRN_CR3 \| CPUMCTX_EXTRN_CR4
617	\| CPUMCTX_EXTRN_EFER \| CPUMCTX_EXTRN_GDTR \| CPUMCTX_EXTRN_LDTR);
618
619	uint64_t GCPtrLdt;
620	uint32_t cbLdt;
621	RTSEL SelLdt = CPUMGetGuestLdtrEx(pVCpu, &GCPtrLdt, &cbLdt);
622	if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
623	{
624	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
625	return;
626	}
627
628	pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RX64 limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
629	unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
630	for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
631	{
632	X86DESC LdtE;
633	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
634	if (RT_SUCCESS(rc))
635	{
636	if (LdtE.Gen.u1Present)
637	{
638	char szOutput[128];
639	selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
640	pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
641	}
642	}
643	else if (rc == VERR_PAGE_NOT_PRESENT)
644	{
645	if ((GCPtrLdt & GUEST_PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
646	pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, GCPtrLdt);
647	}
648	else
649	pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) \| X86_SEL_LDT, rc, GCPtrLdt);
650	}
651	NOREF(pszArgs);
652	}
653
654
655	/**
656	* Dumps the guest GDT
657	*
658	* @param pVM The cross context VM structure.
659	*/
660	VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
661	{
662	DBGFR3Info(pVM->pUVM, "gdt", NULL, NULL);
663	}
664
665
666	/**
667	* Dumps the guest LDT
668	*
669	* @param pVM The cross context VM structure.
670	*/
671	VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
672	{
673	DBGFR3Info(pVM->pUVM, "ldt", NULL, NULL);
674	}
675

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source: vbox/trunk/src/VBox/VMM/VMMR3/SELM.cpp@ 94617

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