SELMRC.cpp@ 43054

Last change on this file since 43054 was 42696, checked in by vboxsync, 12 years ago
SELMRC/TSS: Better assertion.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 22.9 KB

Line
1	/* $Id: SELMRC.cpp 42696 2012-08-08 23:31:46Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager, Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_SELM
22	#include <VBox/vmm/selm.h>
23	#include <VBox/vmm/mm.h>
24	#include <VBox/vmm/em.h>
25	#include <VBox/vmm/trpm.h>
26	#include "SELMInternal.h"
27	#include <VBox/vmm/vm.h>
28	#include <VBox/vmm/vmm.h>
29	#include <VBox/vmm/pgm.h>
30
31	#include <VBox/param.h>
32	#include <VBox/err.h>
33	#include <VBox/log.h>
34	#include <iprt/assert.h>
35	#include <iprt/asm.h>
36
37
38	/*******************************************************************************
39	* Global Variables *
40	*******************************************************************************/
41	#ifdef LOG_ENABLED
42	/** Segment register names. */
43	static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
44	#endif
45
46
47	/**
48	* Synchronizes one GDT entry (guest -> shadow).
49	*
50	* @returns VBox strict status code (appropriate for trap handling and GC
51	* return).
52	* @retval VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT
53	* @retval VINF_SELM_SYNC_GDT
54	* @retval VINF_EM_RESCHEDULE_REM
55	*
56	* @param pVM Pointer to the VM.
57	* @param pVCpu The current virtual CPU.
58	* @param pRegFrame Trap register frame.
59	* @param iGDTEntry The GDT entry to sync.
60	*
61	* @remarks Caller checks that this isn't the LDT entry!
62	*/
63	static VBOXSTRICTRC selmRCSyncGDTEntry(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, unsigned iGDTEntry)
64	{
65	Log2(("GDT %04X LDTR=%04X\n", iGDTEntry, CPUMGetGuestLDTR(pVCpu)));
66
67	/*
68	* Validate the offset.
69	*/
70	VBOXGDTR GdtrGuest;
71	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
72	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
73	if ( iGDTEntry >= SELM_GDT_ELEMENTS
74	\|\| offEntry > GdtrGuest.cbGdt)
75	return VINF_SUCCESS; /* ignore */
76
77	/*
78	* Read the guest descriptor.
79	*/
80	X86DESC Desc;
81	int rc = MMGCRamRead(pVM, &Desc, (uint8_t *)(uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
82	if (RT_FAILURE(rc))
83	{
84	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, (uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
85	if (RT_FAILURE(rc))
86	{
87	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
88	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
89	return VINF_EM_RESCHEDULE_REM;
90	}
91	}
92
93	/*
94	* Check for conflicts.
95	*/
96	RTSEL Sel = iGDTEntry << X86_SEL_SHIFT;
97	Assert( !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] & ~X86_SEL_MASK_OFF_RPL)
98	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] & ~X86_SEL_MASK_OFF_RPL)
99	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] & ~X86_SEL_MASK_OFF_RPL)
100	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] & ~X86_SEL_MASK_OFF_RPL)
101	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] & ~X86_SEL_MASK_OFF_RPL));
102	if ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == Sel
103	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == Sel
104	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == Sel
105	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == Sel
106	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == Sel)
107	{
108	if (Desc.Gen.u1Present)
109	{
110	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: detected conflict!!\n", Sel, &Desc));
111	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
112	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
113	return VINF_SELM_SYNC_GDT; /** @todo this status code is ignored, unfortunately. */
114	}
115	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: potential conflict (still not present)!\n", Sel, &Desc));
116
117	/* Note: we can't continue below or else we'll change the shadow descriptor!! */
118	/* When the guest makes the selector present, then we'll do a GDT sync. */
119	return VINF_SUCCESS;
120	}
121
122	/*
123	* Convert the guest selector to a shadow selector and update the shadow GDT.
124	*/
125	selmGuestToShadowDesc(&Desc);
126	PX86DESC pShwDescr = &pVM->selm.s.paGdtRC[iGDTEntry];
127	//Log(("O: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(pShwDescr)), X86DESC_LIMIT(pShwDescr), (pShwDescr->au32[1] >> 8) & 0xFFFF ));
128	//Log(("N: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(Desc)), X86DESC_LIMIT(Desc), (Desc.au32[1] >> 8) & 0xFFFF ));
129	*pShwDescr = Desc;
130
131	/*
132	* Detect and mark stale registers.
133	*/
134	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
135	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu); Assert(CPUMCTX2CORE(pCtx) == pRegFrame);
136	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
137	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
138	{
139	if (Sel == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
140	{
141	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
142	{
143	if (selmIsSRegStale32(&paSReg[iSReg], &Desc, iSReg))
144	{
145	Log(("GDT write to selector in %s register %04X (now stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
146	paSReg[iSReg].fFlags \|= CPUMSELREG_FLAGS_STALE;
147	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
148	rcStrict = VINF_EM_RESCHEDULE_REM;
149	}
150	else if (paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE)
151	{
152	Log(("GDT write to selector in %s register %04X (no longer stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
153	paSReg[iSReg].fFlags &= ~CPUMSELREG_FLAGS_STALE;
154	}
155	else
156	Log(("GDT write to selector in %s register %04X (no important change)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
157	}
158	else
159	Log(("GDT write to selector in %s register %04X (out of sync)\n", paSReg[iSReg].Sel));
160	}
161	}
162
163	/** @todo Detect stale LDTR as well? */
164
165	return rcStrict;
166	}
167
168
169	/**
170	* Synchronizes any segment registers refering to the given GDT entry.
171	*
172	* This is called before any changes performed and shadowed, so it's possible to
173	* look in both the shadow and guest descriptor table entries for hidden
174	* register content.
175	*
176	* @param pVM Pointer to the VM.
177	* @param pVCpu The current virtual CPU.
178	* @param pRegFrame Trap register frame.
179	* @param iGDTEntry The GDT entry to sync.
180	*/
181	static void selmRCSyncGDTSegRegs(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, unsigned iGDTEntry)
182	{
183	/*
184	* Validate the offset.
185	*/
186	VBOXGDTR GdtrGuest;
187	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
188	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
189	if ( iGDTEntry >= SELM_GDT_ELEMENTS
190	\|\| offEntry > GdtrGuest.cbGdt)
191	return;
192
193	/*
194	* Sync outdated segment registers using this entry.
195	*/
196	PCX86DESC pDesc = &pVM->selm.s.CTX_SUFF(paGdt)[iGDTEntry];
197	uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
198	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu); Assert(CPUMCTX2CORE(pCtx) == pRegFrame);
199	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
200	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
201	{
202	if (iGDTEntry == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
203	{
204	if (!CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
205	{
206	if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
207	{
208	selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
209	Log(("selmRCSyncGDTSegRegs: Updated %s\n", g_aszSRegNms[iSReg]));
210	}
211	else
212	Log(("selmRCSyncGDTSegRegs: Bad shadow descriptor %#x (for %s): %.8Rhxs \n",
213	iGDTEntry, g_aszSRegNms[iSReg], pDesc));
214	}
215	}
216	}
217
218	}
219
220
221
222	/**
223	* \#PF Virtual Handler callback for Guest write access to the Guest's own GDT.
224	*
225	* @returns VBox status code (appropriate for trap handling and GC return).
226	* @param pVM Pointer to the VM.
227	* @param uErrorCode CPU Error code.
228	* @param pRegFrame Trap register frame.
229	* @param pvFault The fault address (cr2).
230	* @param pvRange The base address of the handled virtual range.
231	* @param offRange The offset of the access into this range.
232	* (If it's a EIP range this is the EIP, if not it's pvFault.)
233	*/
234	VMMRCDECL(int) selmRCGuestGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
235	{
236	PVMCPU pVCpu = VMMGetCpu0(pVM);
237	LogFlow(("selmRCGuestGDTWriteHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
238	NOREF(pvRange);
239
240	/*
241	* Check if any selectors might be affected.
242	*/
243	unsigned const iGDTE1 = offRange >> X86_SEL_SHIFT;
244	selmRCSyncGDTSegRegs(pVM, pVCpu, pRegFrame, iGDTE1);
245	if (((offRange + 8) >> X86_SEL_SHIFT) != iGDTE1)
246	selmRCSyncGDTSegRegs(pVM, pVCpu, pRegFrame, iGDTE1 + 1);
247
248	/*
249	* Attempt to emulate the instruction and sync the affected entries.
250	*/
251	uint32_t cb;
252	int rc = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
253	if (RT_SUCCESS(rc) && cb)
254	{
255	/* Check if the LDT was in any way affected. Do not sync the
256	shadow GDT if that's the case or we might have trouble in
257	the world switcher (or so they say). */
258	unsigned const iLdt = CPUMGetGuestLDTR(pVCpu) >> X86_SEL_SHIFT;
259	unsigned const iGDTE2 = (offRange + cb - 1) >> X86_SEL_SHIFT;
260	if ( iGDTE1 == iLdt
261	\|\| iGDTE2 == iLdt)
262	{
263	Log(("LDTR selector change -> fall back to HC!!\n"));
264	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
265	rc = VINF_SELM_SYNC_GDT;
266	/** @todo Implement correct stale LDT handling. */
267	}
268	else
269	{
270	/* Sync the shadow GDT and continue provided the update didn't
271	cause any segment registers to go stale in any way. */
272	int rc2 = selmRCSyncGDTEntry(pVM, pVCpu, pRegFrame, iGDTE1);
273	if (rc2 == VINF_SUCCESS \|\| rc2 == VINF_EM_RESCHEDULE_REM)
274	{
275	if (rc == VINF_SUCCESS)
276	rc = rc2;
277
278	if (iGDTE1 != iGDTE2)
279	{
280	rc2 = selmRCSyncGDTEntry(pVM, pVCpu, pRegFrame, iGDTE2);
281	if (rc == VINF_SUCCESS)
282	rc = rc2;
283	}
284
285	if (rc2 == VINF_SUCCESS \|\| rc2 == VINF_EM_RESCHEDULE_REM)
286	{
287	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTHandled);
288	return rc;
289	}
290	}
291
292	/* sync failed, return to ring-3 and resync the GDT. */
293	if (rc == VINF_SUCCESS \|\| RT_FAILURE(rc2))
294	rc = rc2;
295	}
296	}
297	else
298	{
299	Assert(RT_FAILURE(rc));
300	if (rc == VERR_EM_INTERPRETER)
301	rc = VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
302	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
303	}
304
305	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTUnhandled);
306	return rc;
307	}
308
309
310	/**
311	* \#PF Virtual Handler callback for Guest write access to the Guest's own LDT.
312	*
313	* @returns VBox status code (appropriate for trap handling and GC return).
314	* @param pVM Pointer to the VM.
315	* @param uErrorCode CPU Error code.
316	* @param pRegFrame Trap register frame.
317	* @param pvFault The fault address (cr2).
318	* @param pvRange The base address of the handled virtual range.
319	* @param offRange The offset of the access into this range.
320	* (If it's a EIP range this is the EIP, if not it's pvFault.)
321	*/
322	VMMRCDECL(int) selmRCGuestLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
323	{
324	/** @todo To be implemented. */
325	////LogCom(("selmRCGuestLDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
326	NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
327
328	VMCPU_FF_SET(VMMGetCpu0(pVM), VMCPU_FF_SELM_SYNC_LDT);
329	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestLDT);
330	return VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT;
331	}
332
333
334	/**
335	* Read wrapper used by selmRCGuestTSSWriteHandler.
336	* @returns VBox status code (appropriate for trap handling and GC return).
337	* @param pVM Pointer to the VM.
338	* @param pvDst Where to put the bits we read.
339	* @param pvSrc Guest address to read from.
340	* @param cb The number of bytes to read.
341	*/
342	DECLINLINE(int) selmRCReadTssBits(PVM pVM, void pvDst, void const pvSrc, size_t cb)
343	{
344	PVMCPU pVCpu = VMMGetCpu0(pVM);
345
346	int rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
347	if (RT_SUCCESS(rc))
348	return VINF_SUCCESS;
349
350	/** @todo use different fallback? */
351	rc = PGMPrefetchPage(pVCpu, (uintptr_t)pvSrc);
352	AssertMsg(rc == VINF_SUCCESS, ("PGMPrefetchPage %p failed with %Rrc\n", &pvSrc, rc));
353	if (rc == VINF_SUCCESS)
354	{
355	rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
356	AssertMsg(rc == VINF_SUCCESS, ("MMGCRamRead %p failed with %Rrc\n", &pvSrc, rc));
357	}
358	return rc;
359	}
360
361	/**
362	* \#PF Virtual Handler callback for Guest write access to the Guest's own current TSS.
363	*
364	* @returns VBox status code (appropriate for trap handling and GC return).
365	* @param pVM Pointer to the VM.
366	* @param uErrorCode CPU Error code.
367	* @param pRegFrame Trap register frame.
368	* @param pvFault The fault address (cr2).
369	* @param pvRange The base address of the handled virtual range.
370	* @param offRange The offset of the access into this range.
371	* (If it's a EIP range this is the EIP, if not it's pvFault.)
372	*/
373	VMMRCDECL(int) selmRCGuestTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
374	{
375	PVMCPU pVCpu = VMMGetCpu0(pVM);
376	LogFlow(("selmRCGuestTSSWriteHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
377	NOREF(pvRange);
378
379	/*
380	* Try emulate the access.
381	*/
382	uint32_t cb;
383	int rc = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
384	if (RT_SUCCESS(rc) && cb)
385	{
386	rc = VINF_SUCCESS;
387
388	/*
389	* If it's on the same page as the esp0 and ss0 fields or actually one of them,
390	* then check if any of these has changed.
391	*/
392	PCVBOXTSS pGuestTss = (PVBOXTSS)(uintptr_t)pVM->selm.s.GCPtrGuestTss;
393	if ( PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS(&pGuestTss->padding_ss0)
394	&& PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS((uint8_t *)pGuestTss + offRange)
395	&& ( pGuestTss->esp0 != pVM->selm.s.Tss.esp1
396	\|\| pGuestTss->ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
397	)
398	{
399	Log(("selmRCGuestTSSWriteHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
400	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)pGuestTss->ss0, (RTGCPTR)pGuestTss->esp0));
401	pVM->selm.s.Tss.esp1 = pGuestTss->esp0;
402	pVM->selm.s.Tss.ss1 = pGuestTss->ss0 \| 1;
403	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
404	}
405	/* Handle misaligned TSS in a safe manner (just in case). */
406	else if ( offRange >= RT_UOFFSETOF(VBOXTSS, esp0)
407	&& offRange < RT_UOFFSETOF(VBOXTSS, padding_ss0))
408	{
409	struct
410	{
411	uint32_t esp0;
412	uint16_t ss0;
413	uint16_t padding_ss0;
414	} s;
415	AssertCompileSize(s, 8);
416	rc = selmRCReadTssBits(pVM, &s, &pGuestTss->esp0, sizeof(s));
417	if ( rc == VINF_SUCCESS
418	&& ( s.esp0 != pVM->selm.s.Tss.esp1
419	\|\| s.ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
420	)
421	{
422	Log(("selmRCGuestTSSWriteHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv [x-page]\n",
423	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)s.ss0, (RTGCPTR)s.esp0));
424	pVM->selm.s.Tss.esp1 = s.esp0;
425	pVM->selm.s.Tss.ss1 = s.ss0 \| 1;
426	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
427	}
428	}
429
430	/*
431	* If VME is enabled we need to check if the interrupt redirection bitmap
432	* needs updating.
433	*/
434	if ( offRange >= RT_UOFFSETOF(VBOXTSS, offIoBitmap)
435	&& (CPUMGetGuestCR4(pVCpu) & X86_CR4_VME))
436	{
437	if (offRange - RT_UOFFSETOF(VBOXTSS, offIoBitmap) < sizeof(pGuestTss->offIoBitmap))
438	{
439	uint16_t offIoBitmap = pGuestTss->offIoBitmap;
440	if (offIoBitmap != pVM->selm.s.offGuestIoBitmap)
441	{
442	Log(("TSS offIoBitmap changed: old=%#x new=%#x -> resync in ring-3\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
443	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
444	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
445	}
446	else
447	Log(("TSS offIoBitmap: old=%#x new=%#x [unchanged]\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
448	}
449	else
450	{
451	/** @todo not sure how the partial case is handled; probably not allowed */
452	uint32_t offIntRedirBitmap = pVM->selm.s.offGuestIoBitmap - sizeof(pVM->selm.s.Tss.IntRedirBitmap);
453	if ( offIntRedirBitmap <= offRange
454	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) >= offRange + cb
455	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) <= pVM->selm.s.cbGuestTss)
456	{
457	Log(("TSS IntRedirBitmap Changed: offIoBitmap=%x offIntRedirBitmap=%x cbTSS=%x offRange=%x cb=%x\n",
458	pVM->selm.s.offGuestIoBitmap, offIntRedirBitmap, pVM->selm.s.cbGuestTss, offRange, cb));
459
460	/** @todo only update the changed part. */
461	for (uint32_t i = 0; i < sizeof(pVM->selm.s.Tss.IntRedirBitmap) / 8; i++)
462	{
463	rc = selmRCReadTssBits(pVM, &pVM->selm.s.Tss.IntRedirBitmap[i * 8],
464	(uint8_t )pGuestTss + offIntRedirBitmap + i 8, 8);
465	if (rc != VINF_SUCCESS)
466	break;
467	}
468	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSRedir);
469	}
470	}
471	}
472
473	/* Return to ring-3 for a full resync if any of the above fails... (?) */
474	if (rc != VINF_SUCCESS)
475	{
476	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
477	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
478	if (RT_SUCCESS(rc))
479	rc = VINF_SUCCESS;
480	}
481
482	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandled);
483	}
484	else
485	{
486	AssertMsg(RT_FAILURE(rc), ("cb=%u rc=%#x\n", cb, rc));
487	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
488	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSUnhandled);
489	if (rc == VERR_EM_INTERPRETER)
490	rc = VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
491	}
492	return rc;
493	}
494
495
496	/**
497	* \#PF Virtual Handler callback for Guest write access to the VBox shadow GDT.
498	*
499	* @returns VBox status code (appropriate for trap handling and GC return).
500	* @param pVM Pointer to the VM.
501	* @param uErrorCode CPU Error code.
502	* @param pRegFrame Trap register frame.
503	* @param pvFault The fault address (cr2).
504	* @param pvRange The base address of the handled virtual range.
505	* @param offRange The offset of the access into this range.
506	* (If it's a EIP range this is the EIP, if not it's pvFault.)
507	*/
508	VMMRCDECL(int) selmRCShadowGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
509	{
510	LogRel(("FATAL ERROR: selmRCShadowGDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
511	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
512	return VERR_SELM_SHADOW_GDT_WRITE;
513	}
514
515
516	/**
517	* \#PF Virtual Handler callback for Guest write access to the VBox shadow LDT.
518	*
519	* @returns VBox status code (appropriate for trap handling and GC return).
520	* @param pVM Pointer to the VM.
521	* @param uErrorCode CPU Error code.
522	* @param pRegFrame Trap register frame.
523	* @param pvFault The fault address (cr2).
524	* @param pvRange The base address of the handled virtual range.
525	* @param offRange The offset of the access into this range.
526	* (If it's a EIP range this is the EIP, if not it's pvFault.)
527	*/
528	VMMRCDECL(int) selmRCShadowLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
529	{
530	LogRel(("FATAL ERROR: selmRCShadowLDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
531	Assert(pvFault - (uintptr_t)pVM->selm.s.pvLdtRC < (unsigned)(65536U + PAGE_SIZE));
532	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
533	return VERR_SELM_SHADOW_LDT_WRITE;
534	}
535
536
537	/**
538	* \#PF Virtual Handler callback for Guest write access to the VBox shadow TSS.
539	*
540	* @returns VBox status code (appropriate for trap handling and GC return).
541	* @param pVM Pointer to the VM.
542	* @param uErrorCode CPU Error code.
543	* @param pRegFrame Trap register frame.
544	* @param pvFault The fault address (cr2).
545	* @param pvRange The base address of the handled virtual range.
546	* @param offRange The offset of the access into this range.
547	* (If it's a EIP range this is the EIP, if not it's pvFault.)
548	*/
549	VMMRCDECL(int) selmRCShadowTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
550	{
551	LogRel(("FATAL ERROR: selmRCShadowTSSWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
552	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
553	return VERR_SELM_SHADOW_TSS_WRITE;
554	}
555

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/VMM/VMMRC/SELMRC.cpp@ 43054

Download in other formats: