SELMRC.cpp@ 77847

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1	/* $Id: SELMRC.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager, Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 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
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_SELM
23	#include <VBox/vmm/selm.h>
24	#include <VBox/vmm/mm.h>
25	#include <VBox/vmm/em.h>
26	#include <VBox/vmm/trpm.h>
27	#include "SELMInternal.h"
28	#include <VBox/vmm/vm.h>
29	#include <VBox/vmm/vmm.h>
30	#include <VBox/vmm/pgm.h>
31
32	#include <VBox/param.h>
33	#include <VBox/err.h>
34	#include <VBox/log.h>
35	#include <iprt/assert.h>
36	#include <iprt/asm.h>
37
38	#include "SELMInline.h"
39
40
41	/*********************************************************************************************************************************
42	* Global Variables *
43	*********************************************************************************************************************************/
44	#ifdef LOG_ENABLED
45	/** Segment register names. */
46	static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
47	#endif
48
49
50	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
51
52	/**
53	* Synchronizes one GDT entry (guest -> shadow).
54	*
55	* @returns VBox strict status code (appropriate for trap handling and GC
56	* return).
57	* @retval VINF_SUCCESS
58	* @retval VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT
59	* @retval VINF_SELM_SYNC_GDT
60	*
61	* @param pVM The cross context VM structure.
62	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
63	* @param pCtx CPU context for the current CPU.
64	* @param iGDTEntry The GDT entry to sync.
65	*
66	* @remarks Caller checks that this isn't the LDT entry!
67	*/
68	static VBOXSTRICTRC selmRCSyncGDTEntry(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, unsigned iGDTEntry)
69	{
70	Log2(("GDT %04X LDTR=%04X\n", iGDTEntry, CPUMGetGuestLDTR(pVCpu)));
71
72	/*
73	* Validate the offset.
74	*/
75	VBOXGDTR GdtrGuest;
76	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
77	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
78	if ( iGDTEntry >= SELM_GDT_ELEMENTS
79	\|\| offEntry > GdtrGuest.cbGdt)
80	return VINF_SUCCESS; /* ignore */
81
82	/*
83	* Read the guest descriptor.
84	*/
85	X86DESC Desc;
86	int rc = MMGCRamRead(pVM, &Desc, (uint8_t *)(uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
87	if (RT_FAILURE(rc))
88	{
89	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, (uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
90	if (RT_FAILURE(rc))
91	{
92	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
93	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
94	/* return VINF_EM_RESCHEDULE_REM; - bad idea if we're in a patch. */
95	return VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
96	}
97	}
98
99	/*
100	* Check for conflicts.
101	*/
102	RTSEL Sel = iGDTEntry << X86_SEL_SHIFT;
103	Assert( !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] & ~X86_SEL_MASK_OFF_RPL)
104	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] & ~X86_SEL_MASK_OFF_RPL)
105	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] & ~X86_SEL_MASK_OFF_RPL)
106	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] & ~X86_SEL_MASK_OFF_RPL)
107	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] & ~X86_SEL_MASK_OFF_RPL));
108	if ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == Sel
109	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == Sel
110	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == Sel
111	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == Sel
112	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == Sel)
113	{
114	if (Desc.Gen.u1Present)
115	{
116	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: detected conflict!!\n", Sel, &Desc));
117	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
118	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
119	return VINF_SELM_SYNC_GDT; /** @todo this status code is ignored, unfortunately. */
120	}
121	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: potential conflict (still not present)!\n", Sel, &Desc));
122
123	/* Note: we can't continue below or else we'll change the shadow descriptor!! */
124	/* When the guest makes the selector present, then we'll do a GDT sync. */
125	return VINF_SUCCESS;
126	}
127
128	/*
129	* Convert the guest selector to a shadow selector and update the shadow GDT.
130	*/
131	selmGuestToShadowDesc(pVM, &Desc);
132	PX86DESC pShwDescr = &pVM->selm.s.paGdtRC[iGDTEntry];
133	//Log(("O: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(pShwDescr)), X86DESC_LIMIT(pShwDescr), (pShwDescr->au32[1] >> 8) & 0xFFFF ));
134	//Log(("N: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(Desc)), X86DESC_LIMIT(Desc), (Desc.au32[1] >> 8) & 0xFFFF ));
135	*pShwDescr = Desc;
136
137	/*
138	* Detect and mark stale registers.
139	*/
140	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
141	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
142	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
143	{
144	if (Sel == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
145	{
146	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
147	{
148	if (selmIsSRegStale32(&paSReg[iSReg], &Desc, iSReg))
149	{
150	Log(("GDT write to selector in %s register %04X (now stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
151	paSReg[iSReg].fFlags \|= CPUMSELREG_FLAGS_STALE;
152	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
153	/* rcStrict = VINF_EM_RESCHEDULE_REM; - bad idea if we're in a patch. */
154	rcStrict = VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
155	}
156	else if (paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE)
157	{
158	Log(("GDT write to selector in %s register %04X (no longer stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
159	paSReg[iSReg].fFlags &= ~CPUMSELREG_FLAGS_STALE;
160	}
161	else
162	Log(("GDT write to selector in %s register %04X (no important change)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
163	}
164	else
165	Log(("GDT write to selector in %s register %04X (out of sync)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
166	}
167	}
168
169	/** @todo Detect stale LDTR as well? */
170
171	return rcStrict;
172	}
173
174
175	/**
176	* Synchronizes any segment registers refering to the given GDT entry.
177	*
178	* This is called before any changes performed and shadowed, so it's possible to
179	* look in both the shadow and guest descriptor table entries for hidden
180	* register content.
181	*
182	* @param pVM The cross context VM structure.
183	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
184	* @param pCtx The CPU context.
185	* @param iGDTEntry The GDT entry to sync.
186	*/
187	void selmRCSyncGdtSegRegs(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, unsigned iGDTEntry)
188	{
189	/*
190	* Validate the offset.
191	*/
192	VBOXGDTR GdtrGuest;
193	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
194	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
195	if ( iGDTEntry >= SELM_GDT_ELEMENTS
196	\|\| offEntry > GdtrGuest.cbGdt)
197	return;
198
199	/*
200	* Sync outdated segment registers using this entry.
201	*/
202	PCX86DESC pDesc = &pVM->selm.s.CTX_SUFF(paGdt)[iGDTEntry];
203	uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
204	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
205	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
206	{
207	if (iGDTEntry == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
208	{
209	if (!CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
210	{
211	if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
212	{
213	selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
214	Log(("selmRCSyncGDTSegRegs: Updated %s\n", g_aszSRegNms[iSReg]));
215	}
216	else
217	Log(("selmRCSyncGDTSegRegs: Bad shadow descriptor %#x (for %s): %.8Rhxs \n",
218	iGDTEntry, g_aszSRegNms[iSReg], pDesc));
219	}
220	}
221	}
222	}
223
224
225	/**
226	* Syncs hidden selector register parts before emulating a GDT change.
227	*
228	* This is shared between the selmRCGuestGDTWritePfHandler and
229	* selmGuestGDTWriteHandler.
230	*
231	* @param pVM The cross context VM structure.
232	* @param pVCpu The cross context virtual CPU structure.
233	* @param offGuestTss The offset into the TSS of the write that was made.
234	* @param cbWrite The number of bytes written.
235	* @param pCtx The current CPU context.
236	*/
237	void selmRCGuestGdtPreWriteCheck(PVM pVM, PVMCPU pVCpu, uint32_t offGuestGdt, uint32_t cbWrite, PCPUMCTX pCtx)
238	{
239	uint32_t iGdt = offGuestGdt >> X86_SEL_SHIFT;
240	uint32_t const iGdtLast = (offGuestGdt + cbWrite - 1) >> X86_SEL_SHIFT;
241	do
242	{
243	selmRCSyncGdtSegRegs(pVM, pVCpu, pCtx, iGdt);
244	iGdt++;
245	} while (iGdt <= iGdtLast);
246	}
247
248
249	/**
250	* Checks the guest GDT for changes after a write has been emulated.
251	*
252	*
253	* This is shared between the selmRCGuestGDTWritePfHandler and
254	* selmGuestGDTWriteHandler.
255	*
256	* @retval VINF_SUCCESS
257	* @retval VINF_SELM_SYNC_GDT
258	* @retval VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT
259	*
260	* @param pVM The cross context VM structure.
261	* @param pVCpu The cross context virtual CPU structure.
262	* @param offGuestTss The offset into the TSS of the write that was made.
263	* @param cbWrite The number of bytes written.
264	* @param pCtx The current CPU context.
265	*/
266	VBOXSTRICTRC selmRCGuestGdtPostWriteCheck(PVM pVM, PVMCPU pVCpu, uint32_t offGuestGdt, uint32_t cbWrite, PCPUMCTX pCtx)
267	{
268	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
269
270	/* Check if the LDT was in any way affected. Do not sync the
271	shadow GDT if that's the case or we might have trouble in
272	the world switcher (or so they say). */
273	uint32_t const iGdtFirst = offGuestGdt >> X86_SEL_SHIFT;
274	uint32_t const iGdtLast = (offGuestGdt + cbWrite - 1) >> X86_SEL_SHIFT;
275	uint32_t const iLdt = CPUMGetGuestLDTR(pVCpu) >> X86_SEL_SHIFT;
276	if (iGdtFirst <= iLdt && iGdtLast >= iLdt)
277	{
278	Log(("LDTR selector change -> fall back to HC!!\n"));
279	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
280	rcStrict = VINF_SELM_SYNC_GDT;
281	/** @todo Implement correct stale LDT handling. */
282	}
283	else
284	{
285	/* Sync the shadow GDT and continue provided the update didn't
286	cause any segment registers to go stale in any way. */
287	uint32_t iGdt = iGdtFirst;
288	do
289	{
290	VBOXSTRICTRC rcStrict2 = selmRCSyncGDTEntry(pVM, pVCpu, pCtx, iGdt);
291	Assert(rcStrict2 == VINF_SUCCESS \|\| rcStrict2 == VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT \|\| rcStrict2 == VINF_SELM_SYNC_GDT);
292	if (rcStrict == VINF_SUCCESS)
293	rcStrict = rcStrict2;
294	iGdt++;
295	} while ( iGdt <= iGdtLast
296	&& (rcStrict == VINF_SUCCESS \|\| rcStrict == VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT));
297	if (rcStrict == VINF_SUCCESS \|\| rcStrict == VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT)
298	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTHandled);
299	}
300	return rcStrict;
301	}
302
303
304	/**
305	* @callback_method_impl{FNPGMVIRTHANDLER, Guest GDT write access \#PF handler }
306	*/
307	DECLEXPORT(VBOXSTRICTRC) selmRCGuestGDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
308	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
309	{
310	LogFlow(("selmRCGuestGDTWritePfHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
311	NOREF(pvRange); NOREF(pvUser); RT_NOREF_PV(uErrorCode);
312
313	/*
314	* Check if any selectors might be affected.
315	*/
316	selmRCGuestGdtPreWriteCheck(pVM, pVCpu, offRange, 8 /cbWrite/, CPUMCTX_FROM_CORE(pRegFrame));
317
318	/*
319	* Attempt to emulate the instruction and sync the affected entries.
320	*/
321	uint32_t cb;
322	VBOXSTRICTRC rcStrict = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
323	if (RT_SUCCESS(rcStrict) && cb)
324	rcStrict = selmRCGuestGdtPostWriteCheck(pVM, pVCpu, offRange, cb, CPUMCTX_FROM_CORE(pRegFrame));
325	else
326	{
327	Assert(RT_FAILURE(rcStrict));
328	if (rcStrict == VERR_EM_INTERPRETER)
329	rcStrict = VINF_EM_RAW_EMULATE_INSTR; /* No, not VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT, see PGM_PHYS_RW_IS_SUCCESS. */
330	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
331	}
332
333	if (!VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
334	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTHandled);
335	else
336	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTUnhandled);
337	return rcStrict;
338	}
339
340	#endif /* SELM_TRACK_GUEST_GDT_CHANGES */
341
342	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
343	/**
344	* @callback_method_impl{FNPGMVIRTHANDLER, Guest LDT write access \#PF handler }
345	*/
346	DECLEXPORT(VBOXSTRICTRC) selmRCGuestLDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
347	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
348	{
349	/** @todo To be implemented... or not. */
350	////LogCom(("selmRCGuestLDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
351	NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
352
353	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
354	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestLDT); RT_NOREF_PV(pVM);
355	return VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT;
356	}
357	#endif
358
359
360	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
361
362	/**
363	* Read wrapper used by selmRCGuestTSSWriteHandler.
364	* @returns VBox status code (appropriate for trap handling and GC return).
365	* @param pVM The cross context VM structure.
366	* @param pvDst Where to put the bits we read.
367	* @param pvSrc Guest address to read from.
368	* @param cb The number of bytes to read.
369	*/
370	DECLINLINE(int) selmRCReadTssBits(PVM pVM, PVMCPU pVCpu, void pvDst, void const pvSrc, size_t cb)
371	{
372	int rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
373	if (RT_SUCCESS(rc))
374	return VINF_SUCCESS;
375
376	/** @todo use different fallback? */
377	rc = PGMPrefetchPage(pVCpu, (uintptr_t)pvSrc);
378	AssertMsg(rc == VINF_SUCCESS, ("PGMPrefetchPage %p failed with %Rrc\n", &pvSrc, rc));
379	if (rc == VINF_SUCCESS)
380	{
381	rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
382	AssertMsg(rc == VINF_SUCCESS, ("MMGCRamRead %p failed with %Rrc\n", &pvSrc, rc));
383	}
384	return rc;
385	}
386
387
388	/**
389	* Checks the guest TSS for changes after a write has been emulated.
390	*
391	* This is shared between the
392	*
393	* @returns Strict VBox status code appropriate for raw-mode returns.
394	* @param pVM The cross context VM structure.
395	* @param pVCpu The cross context virtual CPU structure.
396	* @param offGuestTss The offset into the TSS of the write that was made.
397	* @param cbWrite The number of bytes written.
398	*/
399	VBOXSTRICTRC selmRCGuestTssPostWriteCheck(PVM pVM, PVMCPU pVCpu, uint32_t offGuestTss, uint32_t cbWrite)
400	{
401	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
402
403	/*
404	* Check if the ring-0 or/and ring-1 stacks have been change,
405	* synchronize our ring-compressed copies of the stacks.
406	*/
407	struct
408	{
409	uint32_t esp;
410	uint16_t ss;
411	uint16_t padding_ss;
412	} s;
413	AssertCompileSize(s, 8);
414	PCVBOXTSS pGuestTss = (PVBOXTSS)(uintptr_t)pVM->selm.s.GCPtrGuestTss;
415	if ( offGuestTss < RT_UOFFSET_AFTER(VBOXTSS, ss0)
416	&& offGuestTss + cbWrite > RT_UOFFSETOF(VBOXTSS, esp0))
417	{
418	rcStrict = selmRCReadTssBits(pVM, pVCpu, &s, &pGuestTss->esp0, sizeof(s));
419	if ( rcStrict == VINF_SUCCESS
420	&& ( s.esp != pVM->selm.s.Tss.esp1
421	\|\| s.ss != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */)
422	{
423	Log(("selmRCGuestTSSWritePfHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
424	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)s.ss, (RTGCPTR)s.esp));
425	pVM->selm.s.Tss.esp1 = s.esp;
426	pVM->selm.s.Tss.ss1 = s.ss \| 1;
427	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
428	}
429	}
430	# ifdef VBOX_WITH_RAW_RING1
431	if ( EMIsRawRing1Enabled(pVM)
432	&& offGuestTss < RT_UOFFSET_AFTER(VBOXTSS, ss1)
433	&& offGuestTss + cbWrite > RT_UOFFSETOF(VBOXTSS, esp1)
434	&& rcStrict == VINF_SUCCESS)
435	{
436	rcStrict = selmRCReadTssBits(pVM, pVCpu, &s, &pGuestTss->esp1, sizeof(s));
437	if ( rcStrict == VINF_SUCCESS
438	&& ( s.esp != pVM->selm.s.Tss.esp2
439	\|\| s.ss != ((pVM->selm.s.Tss.ss2 & ~2) \| 1)) /* undo raw-r1 */)
440	{
441
442	Log(("selmRCGuestTSSWritePfHandler: R1 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
443	(RTSEL)((pVM->selm.s.Tss.ss2 & ~2) \| 1), (RTGCPTR)pVM->selm.s.Tss.esp2, (RTSEL)s.ss, (RTGCPTR)s.esp));
444	pVM->selm.s.Tss.esp2 = s.esp;
445	pVM->selm.s.Tss.ss2 = (s.ss & ~1) \| 2;
446	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
447	}
448	}
449	# endif
450
451	/*
452	* If VME is enabled we need to check if the interrupt redirection bitmap
453	* needs updating.
454	*/
455	if ( offGuestTss >= RT_UOFFSETOF(VBOXTSS, offIoBitmap)
456	&& (CPUMGetGuestCR4(pVCpu) & X86_CR4_VME)
457	&& rcStrict == VINF_SUCCESS)
458	{
459	if ( offGuestTss < RT_UOFFSET_AFTER(VBOXTSS, offIoBitmap)
460	&& offGuestTss + cbWrite > RT_UOFFSETOF(VBOXTSS, offIoBitmap))
461	{
462	uint16_t offIoBitmap = 0;
463	rcStrict = selmRCReadTssBits(pVM, pVCpu, &offIoBitmap, &pGuestTss->offIoBitmap, sizeof(offIoBitmap));
464	if ( rcStrict != VINF_SUCCESS
465	\|\| offIoBitmap != pVM->selm.s.offGuestIoBitmap)
466	{
467	Log(("TSS offIoBitmap changed: old=%#x new=%#x -> resync in ring-3\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
468	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
469	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
470	}
471	else
472	Log(("TSS offIoBitmap: old=%#x new=%#x [unchanged]\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
473	}
474
475	if ( rcStrict == VINF_SUCCESS
476	&& !VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS)
477	&& pVM->selm.s.offGuestIoBitmap != 0)
478	{
479	/** @todo not sure how the partial case is handled; probably not allowed */
480	uint32_t offIntRedirBitmap = pVM->selm.s.offGuestIoBitmap - sizeof(pVM->selm.s.Tss.IntRedirBitmap);
481	if ( offGuestTss < offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap)
482	&& offGuestTss + cbWrite > offIntRedirBitmap
483	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) <= pVM->selm.s.cbGuestTss)
484	{
485	Log(("TSS IntRedirBitmap Changed: offIoBitmap=%x offIntRedirBitmap=%x cbTSS=%x offGuestTss=%x cbWrite=%x\n",
486	pVM->selm.s.offGuestIoBitmap, offIntRedirBitmap, pVM->selm.s.cbGuestTss, offGuestTss, cbWrite));
487
488	/** @todo only update the changed part. */
489	for (uint32_t i = 0; rcStrict == VINF_SUCCESS && i < sizeof(pVM->selm.s.Tss.IntRedirBitmap) / 8; i++)
490	rcStrict = selmRCReadTssBits(pVM, pVCpu, &pVM->selm.s.Tss.IntRedirBitmap[i * 8],
491	(uint8_t )pGuestTss + offIntRedirBitmap + i 8, 8);
492	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSRedir);
493	}
494	}
495	}
496
497	/*
498	* Return to ring-3 for a full resync if any of the above fails... (?)
499	*/
500	if (rcStrict != VINF_SUCCESS)
501	{
502	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
503	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
504	if (RT_SUCCESS(rcStrict) \|\| rcStrict == VERR_ACCESS_DENIED)
505	rcStrict = VINF_SUCCESS;
506	}
507
508	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandled);
509	return rcStrict;
510	}
511
512
513	/**
514	* @callback_method_impl{FNPGMVIRTHANDLER, Guest TSS write access \#PF handler}
515	*/
516	DECLEXPORT(VBOXSTRICTRC) selmRCGuestTSSWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
517	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
518	{
519	LogFlow(("selmRCGuestTSSWritePfHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
520	NOREF(pvRange); NOREF(pvUser); RT_NOREF_PV(uErrorCode);
521
522	/*
523	* Try emulate the access.
524	*/
525	uint32_t cb;
526	VBOXSTRICTRC rcStrict = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
527	if ( RT_SUCCESS(rcStrict)
528	&& cb)
529	rcStrict = selmRCGuestTssPostWriteCheck(pVM, pVCpu, offRange, cb);
530	else
531	{
532	AssertMsg(RT_FAILURE(rcStrict), ("cb=%u rcStrict=%#x\n", cb, VBOXSTRICTRC_VAL(rcStrict)));
533	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
534	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSUnhandled);
535	if (rcStrict == VERR_EM_INTERPRETER)
536	rcStrict = VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
537	}
538	return rcStrict;
539	}
540
541	#endif /* SELM_TRACK_GUEST_TSS_CHANGES */
542
543	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
544	/**
545	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
546	* \#PF Virtual Handler callback for Guest write access to the VBox shadow GDT.}
547	*/
548	DECLEXPORT(VBOXSTRICTRC) selmRCShadowGDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
549	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
550	{
551	LogRel(("FATAL ERROR: selmRCShadowGDTWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
552	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
553	return VERR_SELM_SHADOW_GDT_WRITE;
554	}
555	#endif
556
557
558	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
559	/**
560	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
561	* \#PF Virtual Handler callback for Guest write access to the VBox shadow LDT.}
562	*/
563	DECLEXPORT(VBOXSTRICTRC) selmRCShadowLDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
564	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
565	{
566	LogRel(("FATAL ERROR: selmRCShadowLDTWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
567	Assert(pvFault - (uintptr_t)pVM->selm.s.pvLdtRC < (unsigned)(65536U + PAGE_SIZE));
568	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
569	return VERR_SELM_SHADOW_LDT_WRITE;
570	}
571	#endif
572
573
574	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
575	/**
576	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
577	* \#PF Virtual Handler callback for Guest write access to the VBox shadow TSS.}
578	*/
579	DECLEXPORT(VBOXSTRICTRC) selmRCShadowTSSWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
580	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
581	{
582	LogRel(("FATAL ERROR: selmRCShadowTSSWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
583	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
584	return VERR_SELM_SHADOW_TSS_WRITE;
585	}
586	#endif
587

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source: vbox/trunk/src/VBox/VMM/VMMRC/SELMRC.cpp@ 77847

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