SELMRC.cpp@ 66011

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1	/* $Id: SELMRC.cpp 62603 2016-07-27 16:22:14Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager, Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
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_PENDING(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	* If it's on the same page as the esp0 and ss0 fields or actually one of them,
405	* then check if any of these has changed.
406	*/
407	/** @todo just read the darn fields and put them on the stack. */
408	PCVBOXTSS pGuestTss = (PVBOXTSS)(uintptr_t)pVM->selm.s.GCPtrGuestTss;
409	if ( PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS(&pGuestTss->padding_ss0)
410	&& PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS((uint8_t *)pGuestTss + offGuestTss)
411	&& ( pGuestTss->esp0 != pVM->selm.s.Tss.esp1
412	\|\| pGuestTss->ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
413	)
414	{
415	Log(("selmRCGuestTSSWritePfHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
416	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)pGuestTss->ss0, (RTGCPTR)pGuestTss->esp0));
417	pVM->selm.s.Tss.esp1 = pGuestTss->esp0;
418	pVM->selm.s.Tss.ss1 = pGuestTss->ss0 \| 1;
419	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
420	}
421	# ifdef VBOX_WITH_RAW_RING1
422	else if ( EMIsRawRing1Enabled(pVM)
423	&& PAGE_ADDRESS(&pGuestTss->esp1) == PAGE_ADDRESS(&pGuestTss->padding_ss1)
424	&& PAGE_ADDRESS(&pGuestTss->esp1) == PAGE_ADDRESS((uint8_t *)pGuestTss + offGuestTss)
425	&& ( pGuestTss->esp1 != pVM->selm.s.Tss.esp2
426	\|\| pGuestTss->ss1 != ((pVM->selm.s.Tss.ss2 & ~2) \| 1)) /* undo raw-r1 */
427	)
428	{
429	Log(("selmRCGuestTSSWritePfHandler: R1 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
430	(RTSEL)((pVM->selm.s.Tss.ss2 & ~2) \| 1), (RTGCPTR)pVM->selm.s.Tss.esp2, (RTSEL)pGuestTss->ss1, (RTGCPTR)pGuestTss->esp1));
431	pVM->selm.s.Tss.esp2 = pGuestTss->esp1;
432	pVM->selm.s.Tss.ss2 = (pGuestTss->ss1 & ~1) \| 2;
433	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
434	}
435	# endif
436	/* Handle misaligned TSS in a safe manner (just in case). */
437	else if ( offGuestTss >= RT_UOFFSETOF(VBOXTSS, esp0)
438	&& offGuestTss < RT_UOFFSETOF(VBOXTSS, padding_ss0))
439	{
440	struct
441	{
442	uint32_t esp0;
443	uint16_t ss0;
444	uint16_t padding_ss0;
445	} s;
446	AssertCompileSize(s, 8);
447	rcStrict = selmRCReadTssBits(pVM, pVCpu, &s, &pGuestTss->esp0, sizeof(s));
448	if ( rcStrict == VINF_SUCCESS
449	&& ( s.esp0 != pVM->selm.s.Tss.esp1
450	\|\| s.ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
451	)
452	{
453	Log(("selmRCGuestTSSWritePfHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv [x-page]\n",
454	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)s.ss0, (RTGCPTR)s.esp0));
455	pVM->selm.s.Tss.esp1 = s.esp0;
456	pVM->selm.s.Tss.ss1 = s.ss0 \| 1;
457	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
458	}
459	}
460
461	/*
462	* If VME is enabled we need to check if the interrupt redirection bitmap
463	* needs updating.
464	*/
465	if ( offGuestTss >= RT_UOFFSETOF(VBOXTSS, offIoBitmap)
466	&& (CPUMGetGuestCR4(pVCpu) & X86_CR4_VME))
467	{
468	if (offGuestTss - RT_UOFFSETOF(VBOXTSS, offIoBitmap) < sizeof(pGuestTss->offIoBitmap))
469	{
470	uint16_t offIoBitmap = pGuestTss->offIoBitmap;
471	if (offIoBitmap != pVM->selm.s.offGuestIoBitmap)
472	{
473	Log(("TSS offIoBitmap changed: old=%#x new=%#x -> resync in ring-3\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
474	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
475	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
476	}
477	else
478	Log(("TSS offIoBitmap: old=%#x new=%#x [unchanged]\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
479	}
480	else
481	{
482	/** @todo not sure how the partial case is handled; probably not allowed */
483	uint32_t offIntRedirBitmap = pVM->selm.s.offGuestIoBitmap - sizeof(pVM->selm.s.Tss.IntRedirBitmap);
484	if ( offIntRedirBitmap <= offGuestTss
485	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) >= offGuestTss + cbWrite
486	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) <= pVM->selm.s.cbGuestTss)
487	{
488	Log(("TSS IntRedirBitmap Changed: offIoBitmap=%x offIntRedirBitmap=%x cbTSS=%x offGuestTss=%x cbWrite=%x\n",
489	pVM->selm.s.offGuestIoBitmap, offIntRedirBitmap, pVM->selm.s.cbGuestTss, offGuestTss, cbWrite));
490
491	/** @todo only update the changed part. */
492	for (uint32_t i = 0; rcStrict == VINF_SUCCESS && i < sizeof(pVM->selm.s.Tss.IntRedirBitmap) / 8; i++)
493	rcStrict = selmRCReadTssBits(pVM, pVCpu, &pVM->selm.s.Tss.IntRedirBitmap[i * 8],
494	(uint8_t )pGuestTss + offIntRedirBitmap + i 8, 8);
495	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSRedir);
496	}
497	}
498	}
499
500	/*
501	* Return to ring-3 for a full resync if any of the above fails... (?)
502	*/
503	if (rcStrict != VINF_SUCCESS)
504	{
505	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
506	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
507	if (RT_SUCCESS(rcStrict))
508	rcStrict = VINF_SUCCESS;
509	}
510
511	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandled);
512	return rcStrict;
513	}
514
515
516	/**
517	* @callback_method_impl{FNPGMVIRTHANDLER, Guest TSS write access \#PF handler}
518	*/
519	DECLEXPORT(VBOXSTRICTRC) selmRCGuestTSSWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
520	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
521	{
522	LogFlow(("selmRCGuestTSSWritePfHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
523	NOREF(pvRange); NOREF(pvUser); RT_NOREF_PV(uErrorCode);
524
525	/*
526	* Try emulate the access.
527	*/
528	uint32_t cb;
529	VBOXSTRICTRC rcStrict = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
530	if ( RT_SUCCESS(rcStrict)
531	&& cb)
532	rcStrict = selmRCGuestTssPostWriteCheck(pVM, pVCpu, offRange, cb);
533	else
534	{
535	AssertMsg(RT_FAILURE(rcStrict), ("cb=%u rcStrict=%#x\n", cb, VBOXSTRICTRC_VAL(rcStrict)));
536	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
537	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSUnhandled);
538	if (rcStrict == VERR_EM_INTERPRETER)
539	rcStrict = VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
540	}
541	return rcStrict;
542	}
543
544	#endif /* SELM_TRACK_GUEST_TSS_CHANGES */
545
546	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
547	/**
548	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
549	* \#PF Virtual Handler callback for Guest write access to the VBox shadow GDT.}
550	*/
551	DECLEXPORT(VBOXSTRICTRC) selmRCShadowGDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
552	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
553	{
554	LogRel(("FATAL ERROR: selmRCShadowGDTWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
555	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
556	return VERR_SELM_SHADOW_GDT_WRITE;
557	}
558	#endif
559
560
561	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
562	/**
563	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
564	* \#PF Virtual Handler callback for Guest write access to the VBox shadow LDT.}
565	*/
566	DECLEXPORT(VBOXSTRICTRC) selmRCShadowLDTWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
567	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
568	{
569	LogRel(("FATAL ERROR: selmRCShadowLDTWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
570	Assert(pvFault - (uintptr_t)pVM->selm.s.pvLdtRC < (unsigned)(65536U + PAGE_SIZE));
571	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
572	return VERR_SELM_SHADOW_LDT_WRITE;
573	}
574	#endif
575
576
577	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
578	/**
579	* @callback_method_impl{FNPGMRCVIRTPFHANDLER,
580	* \#PF Virtual Handler callback for Guest write access to the VBox shadow TSS.}
581	*/
582	DECLEXPORT(VBOXSTRICTRC) selmRCShadowTSSWritePfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame,
583	RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange, void *pvUser)
584	{
585	LogRel(("FATAL ERROR: selmRCShadowTSSWritePfHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
586	NOREF(pVM); NOREF(pVCpu); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange); NOREF(pvUser);
587	return VERR_SELM_SHADOW_TSS_WRITE;
588	}
589	#endif
590

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source: vbox/trunk/src/VBox/VMM/VMMRC/SELMRC.cpp@ 66011

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