SELMRC.cpp@ 46088

Last change on this file since 46088 was 45485, checked in by vboxsync, 12 years ago
*: Where possible, drop the #ifdef VBOX_WITH_RAW_RING1 when EMIsRawRing1Enabled is used. SELM: Don't shadow TSS.esp1/ss1 unless ring-1 compression is enabled (also fixed a log statement there). SELM: selmGuestToShadowDesc should not push ring-1 selectors into ring-2 unless EMIsRawRing1Enabled() holds true. REM: Don't set CPU_INTERRUPT_EXTERNAL_EXIT in helper_ltr() for now.
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1	/* $Id: SELMRC.cpp 45485 2013-04-11 14:46:04Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager, Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 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	#include "SELMInline.h"
38
39
40	/*******************************************************************************
41	* Global Variables *
42	*******************************************************************************/
43	#ifdef LOG_ENABLED
44	/** Segment register names. */
45	static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
46	#endif
47
48
49	#ifdef SELM_TRACK_GUEST_GDT_CHANGES
50	/**
51	* Synchronizes one GDT entry (guest -> shadow).
52	*
53	* @returns VBox strict status code (appropriate for trap handling and GC
54	* return).
55	* @retval VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT
56	* @retval VINF_SELM_SYNC_GDT
57	* @retval VINF_EM_RESCHEDULE_REM
58	*
59	* @param pVM Pointer to the VM.
60	* @param pVCpu The current virtual CPU.
61	* @param pRegFrame Trap register frame.
62	* @param iGDTEntry The GDT entry to sync.
63	*
64	* @remarks Caller checks that this isn't the LDT entry!
65	*/
66	static VBOXSTRICTRC selmRCSyncGDTEntry(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, unsigned iGDTEntry)
67	{
68	Log2(("GDT %04X LDTR=%04X\n", iGDTEntry, CPUMGetGuestLDTR(pVCpu)));
69
70	/*
71	* Validate the offset.
72	*/
73	VBOXGDTR GdtrGuest;
74	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
75	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
76	if ( iGDTEntry >= SELM_GDT_ELEMENTS
77	\|\| offEntry > GdtrGuest.cbGdt)
78	return VINF_SUCCESS; /* ignore */
79
80	/*
81	* Read the guest descriptor.
82	*/
83	X86DESC Desc;
84	int rc = MMGCRamRead(pVM, &Desc, (uint8_t *)(uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
85	if (RT_FAILURE(rc))
86	{
87	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, (uintptr_t)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
88	if (RT_FAILURE(rc))
89	{
90	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
91	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
92	return VINF_EM_RESCHEDULE_REM;
93	}
94	}
95
96	/*
97	* Check for conflicts.
98	*/
99	RTSEL Sel = iGDTEntry << X86_SEL_SHIFT;
100	Assert( !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] & ~X86_SEL_MASK_OFF_RPL)
101	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] & ~X86_SEL_MASK_OFF_RPL)
102	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] & ~X86_SEL_MASK_OFF_RPL)
103	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] & ~X86_SEL_MASK_OFF_RPL)
104	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] & ~X86_SEL_MASK_OFF_RPL));
105	if ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == Sel
106	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == Sel
107	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == Sel
108	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == Sel
109	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == Sel)
110	{
111	if (Desc.Gen.u1Present)
112	{
113	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: detected conflict!!\n", Sel, &Desc));
114	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
115	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
116	return VINF_SELM_SYNC_GDT; /** @todo this status code is ignored, unfortunately. */
117	}
118	Log(("selmRCSyncGDTEntry: Sel=%d Desc=%.8Rhxs: potential conflict (still not present)!\n", Sel, &Desc));
119
120	/* Note: we can't continue below or else we'll change the shadow descriptor!! */
121	/* When the guest makes the selector present, then we'll do a GDT sync. */
122	return VINF_SUCCESS;
123	}
124
125	/*
126	* Convert the guest selector to a shadow selector and update the shadow GDT.
127	*/
128	selmGuestToShadowDesc(pVM, &Desc);
129	PX86DESC pShwDescr = &pVM->selm.s.paGdtRC[iGDTEntry];
130	//Log(("O: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(pShwDescr)), X86DESC_LIMIT(pShwDescr), (pShwDescr->au32[1] >> 8) & 0xFFFF ));
131	//Log(("N: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(Desc)), X86DESC_LIMIT(Desc), (Desc.au32[1] >> 8) & 0xFFFF ));
132	*pShwDescr = Desc;
133
134	/*
135	* Detect and mark stale registers.
136	*/
137	VBOXSTRICTRC rcStrict = VINF_SUCCESS;
138	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu); Assert(CPUMCTX2CORE(pCtx) == pRegFrame);
139	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
140	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
141	{
142	if (Sel == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
143	{
144	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
145	{
146	if (selmIsSRegStale32(&paSReg[iSReg], &Desc, iSReg))
147	{
148	Log(("GDT write to selector in %s register %04X (now stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
149	paSReg[iSReg].fFlags \|= CPUMSELREG_FLAGS_STALE;
150	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3); /* paranoia */
151	rcStrict = VINF_EM_RESCHEDULE_REM;
152	}
153	else if (paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE)
154	{
155	Log(("GDT write to selector in %s register %04X (no longer stale)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
156	paSReg[iSReg].fFlags &= ~CPUMSELREG_FLAGS_STALE;
157	}
158	else
159	Log(("GDT write to selector in %s register %04X (no important change)\n", g_aszSRegNms[iSReg], paSReg[iSReg].Sel));
160	}
161	else
162	Log(("GDT write to selector in %s register %04X (out of sync)\n", paSReg[iSReg].Sel));
163	}
164	}
165
166	/** @todo Detect stale LDTR as well? */
167
168	return rcStrict;
169	}
170
171
172	/**
173	* Synchronizes any segment registers refering to the given GDT entry.
174	*
175	* This is called before any changes performed and shadowed, so it's possible to
176	* look in both the shadow and guest descriptor table entries for hidden
177	* register content.
178	*
179	* @param pVM Pointer to the VM.
180	* @param pVCpu The current virtual CPU.
181	* @param pRegFrame Trap register frame.
182	* @param iGDTEntry The GDT entry to sync.
183	*/
184	static void selmRCSyncGDTSegRegs(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, unsigned iGDTEntry)
185	{
186	/*
187	* Validate the offset.
188	*/
189	VBOXGDTR GdtrGuest;
190	CPUMGetGuestGDTR(pVCpu, &GdtrGuest);
191	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
192	if ( iGDTEntry >= SELM_GDT_ELEMENTS
193	\|\| offEntry > GdtrGuest.cbGdt)
194	return;
195
196	/*
197	* Sync outdated segment registers using this entry.
198	*/
199	PCX86DESC pDesc = &pVM->selm.s.CTX_SUFF(paGdt)[iGDTEntry];
200	uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
201	PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu); Assert(CPUMCTX2CORE(pCtx) == pRegFrame);
202	PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
203	for (unsigned iSReg = 0; iSReg <= X86_SREG_COUNT; iSReg++)
204	{
205	if (iGDTEntry == (paSReg[iSReg].Sel & X86_SEL_MASK_OFF_RPL))
206	{
207	if (!CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
208	{
209	if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
210	{
211	selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
212	Log(("selmRCSyncGDTSegRegs: Updated %s\n", g_aszSRegNms[iSReg]));
213	}
214	else
215	Log(("selmRCSyncGDTSegRegs: Bad shadow descriptor %#x (for %s): %.8Rhxs \n",
216	iGDTEntry, g_aszSRegNms[iSReg], pDesc));
217	}
218	}
219	}
220
221	}
222
223
224
225	/**
226	* \#PF Virtual Handler callback for Guest write access to the Guest's own GDT.
227	*
228	* @returns VBox status code (appropriate for trap handling and GC return).
229	* @param pVM Pointer to the VM.
230	* @param uErrorCode CPU Error code.
231	* @param pRegFrame Trap register frame.
232	* @param pvFault The fault address (cr2).
233	* @param pvRange The base address of the handled virtual range.
234	* @param offRange The offset of the access into this range.
235	* (If it's a EIP range this is the EIP, if not it's pvFault.)
236	*/
237	VMMRCDECL(int) selmRCGuestGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
238	{
239	PVMCPU pVCpu = VMMGetCpu0(pVM);
240	LogFlow(("selmRCGuestGDTWriteHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
241	NOREF(pvRange);
242
243	/*
244	* Check if any selectors might be affected.
245	*/
246	unsigned const iGDTE1 = offRange >> X86_SEL_SHIFT;
247	selmRCSyncGDTSegRegs(pVM, pVCpu, pRegFrame, iGDTE1);
248	if (((offRange + 8) >> X86_SEL_SHIFT) != iGDTE1)
249	selmRCSyncGDTSegRegs(pVM, pVCpu, pRegFrame, iGDTE1 + 1);
250
251	/*
252	* Attempt to emulate the instruction and sync the affected entries.
253	*/
254	uint32_t cb;
255	int rc = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
256	if (RT_SUCCESS(rc) && cb)
257	{
258	/* Check if the LDT was in any way affected. Do not sync the
259	shadow GDT if that's the case or we might have trouble in
260	the world switcher (or so they say). */
261	unsigned const iLdt = CPUMGetGuestLDTR(pVCpu) >> X86_SEL_SHIFT;
262	unsigned const iGDTE2 = (offRange + cb - 1) >> X86_SEL_SHIFT;
263	if ( iGDTE1 == iLdt
264	\|\| iGDTE2 == iLdt)
265	{
266	Log(("LDTR selector change -> fall back to HC!!\n"));
267	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
268	rc = VINF_SELM_SYNC_GDT;
269	/** @todo Implement correct stale LDT handling. */
270	}
271	else
272	{
273	/* Sync the shadow GDT and continue provided the update didn't
274	cause any segment registers to go stale in any way. */
275	int rc2 = selmRCSyncGDTEntry(pVM, pVCpu, pRegFrame, iGDTE1);
276	if (rc2 == VINF_SUCCESS \|\| rc2 == VINF_EM_RESCHEDULE_REM)
277	{
278	if (rc == VINF_SUCCESS)
279	rc = rc2;
280
281	if (iGDTE1 != iGDTE2)
282	{
283	rc2 = selmRCSyncGDTEntry(pVM, pVCpu, pRegFrame, iGDTE2);
284	if (rc == VINF_SUCCESS)
285	rc = rc2;
286	}
287
288	if (rc2 == VINF_SUCCESS \|\| rc2 == VINF_EM_RESCHEDULE_REM)
289	{
290	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTHandled);
291	return rc;
292	}
293	}
294
295	/* sync failed, return to ring-3 and resync the GDT. */
296	if (rc == VINF_SUCCESS \|\| RT_FAILURE(rc2))
297	rc = rc2;
298	}
299	}
300	else
301	{
302	Assert(RT_FAILURE(rc));
303	if (rc == VERR_EM_INTERPRETER)
304	rc = VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
305	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
306	}
307
308	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTUnhandled);
309	return rc;
310	}
311	#endif /* SELM_TRACK_GUEST_GDT_CHANGES */
312
313
314	#ifdef SELM_TRACK_GUEST_LDT_CHANGES
315	/**
316	* \#PF Virtual Handler callback for Guest write access to the Guest's own LDT.
317	*
318	* @returns VBox status code (appropriate for trap handling and GC return).
319	* @param pVM Pointer to the VM.
320	* @param uErrorCode CPU Error code.
321	* @param pRegFrame Trap register frame.
322	* @param pvFault The fault address (cr2).
323	* @param pvRange The base address of the handled virtual range.
324	* @param offRange The offset of the access into this range.
325	* (If it's a EIP range this is the EIP, if not it's pvFault.)
326	*/
327	VMMRCDECL(int) selmRCGuestLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
328	{
329	/** @todo To be implemented. */
330	////LogCom(("selmRCGuestLDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
331	NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
332
333	VMCPU_FF_SET(VMMGetCpu0(pVM), VMCPU_FF_SELM_SYNC_LDT);
334	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestLDT);
335	return VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT;
336	}
337	#endif
338
339
340	#ifdef SELM_TRACK_GUEST_TSS_CHANGES
341	/**
342	* Read wrapper used by selmRCGuestTSSWriteHandler.
343	* @returns VBox status code (appropriate for trap handling and GC return).
344	* @param pVM Pointer to the VM.
345	* @param pvDst Where to put the bits we read.
346	* @param pvSrc Guest address to read from.
347	* @param cb The number of bytes to read.
348	*/
349	DECLINLINE(int) selmRCReadTssBits(PVM pVM, void pvDst, void const pvSrc, size_t cb)
350	{
351	PVMCPU pVCpu = VMMGetCpu0(pVM);
352
353	int rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
354	if (RT_SUCCESS(rc))
355	return VINF_SUCCESS;
356
357	/** @todo use different fallback? */
358	rc = PGMPrefetchPage(pVCpu, (uintptr_t)pvSrc);
359	AssertMsg(rc == VINF_SUCCESS, ("PGMPrefetchPage %p failed with %Rrc\n", &pvSrc, rc));
360	if (rc == VINF_SUCCESS)
361	{
362	rc = MMGCRamRead(pVM, pvDst, (void *)pvSrc, cb);
363	AssertMsg(rc == VINF_SUCCESS, ("MMGCRamRead %p failed with %Rrc\n", &pvSrc, rc));
364	}
365	return rc;
366	}
367
368	/**
369	* \#PF Virtual Handler callback for Guest write access to the Guest's own current TSS.
370	*
371	* @returns VBox status code (appropriate for trap handling and GC return).
372	* @param pVM Pointer to the VM.
373	* @param uErrorCode CPU Error code.
374	* @param pRegFrame Trap register frame.
375	* @param pvFault The fault address (cr2).
376	* @param pvRange The base address of the handled virtual range.
377	* @param offRange The offset of the access into this range.
378	* (If it's a EIP range this is the EIP, if not it's pvFault.)
379	*/
380	VMMRCDECL(int) selmRCGuestTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
381	{
382	PVMCPU pVCpu = VMMGetCpu0(pVM);
383	LogFlow(("selmRCGuestTSSWriteHandler errcode=%x fault=%RGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
384	NOREF(pvRange);
385
386	/*
387	* Try emulate the access.
388	*/
389	uint32_t cb;
390	int rc = EMInterpretInstructionEx(pVCpu, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
391	if ( RT_SUCCESS(rc)
392	&& cb)
393	{
394	rc = VINF_SUCCESS;
395
396	/*
397	* If it's on the same page as the esp0 and ss0 fields or actually one of them,
398	* then check if any of these has changed.
399	*/
400	PCVBOXTSS pGuestTss = (PVBOXTSS)(uintptr_t)pVM->selm.s.GCPtrGuestTss;
401	if ( PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS(&pGuestTss->padding_ss0)
402	&& PAGE_ADDRESS(&pGuestTss->esp0) == PAGE_ADDRESS((uint8_t *)pGuestTss + offRange)
403	&& ( pGuestTss->esp0 != pVM->selm.s.Tss.esp1
404	\|\| pGuestTss->ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
405	)
406	{
407	Log(("selmRCGuestTSSWriteHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
408	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)pGuestTss->ss0, (RTGCPTR)pGuestTss->esp0));
409	pVM->selm.s.Tss.esp1 = pGuestTss->esp0;
410	pVM->selm.s.Tss.ss1 = pGuestTss->ss0 \| 1;
411	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
412	}
413	#ifdef VBOX_WITH_RAW_RING1
414	else if ( EMIsRawRing1Enabled(pVM)
415	&& PAGE_ADDRESS(&pGuestTss->esp1) == PAGE_ADDRESS(&pGuestTss->padding_ss1)
416	&& PAGE_ADDRESS(&pGuestTss->esp1) == PAGE_ADDRESS((uint8_t *)pGuestTss + offRange)
417	&& ( pGuestTss->esp1 != pVM->selm.s.Tss.esp2
418	\|\| pGuestTss->ss1 != ((pVM->selm.s.Tss.ss2 & ~2) \| 1)) /* undo raw-r1 */
419	)
420	{
421	Log(("selmRCGuestTSSWriteHandler: R1 stack: %RTsel:%RGv -> %RTsel:%RGv\n",
422	(RTSEL)((pVM->selm.s.Tss.ss2 & ~2) \| 1), (RTGCPTR)pVM->selm.s.Tss.esp2, (RTSEL)pGuestTss->ss1, (RTGCPTR)pGuestTss->esp1));
423	pVM->selm.s.Tss.esp2 = pGuestTss->esp1;
424	pVM->selm.s.Tss.ss2 = (pGuestTss->ss1 & ~1) \| 2;
425	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
426	}
427	#endif
428	/* Handle misaligned TSS in a safe manner (just in case). */
429	else if ( offRange >= RT_UOFFSETOF(VBOXTSS, esp0)
430	&& offRange < RT_UOFFSETOF(VBOXTSS, padding_ss0))
431	{
432	struct
433	{
434	uint32_t esp0;
435	uint16_t ss0;
436	uint16_t padding_ss0;
437	} s;
438	AssertCompileSize(s, 8);
439	rc = selmRCReadTssBits(pVM, &s, &pGuestTss->esp0, sizeof(s));
440	if ( rc == VINF_SUCCESS
441	&& ( s.esp0 != pVM->selm.s.Tss.esp1
442	\|\| s.ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
443	)
444	{
445	Log(("selmRCGuestTSSWriteHandler: R0 stack: %RTsel:%RGv -> %RTsel:%RGv [x-page]\n",
446	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), (RTGCPTR)pVM->selm.s.Tss.esp1, (RTSEL)s.ss0, (RTGCPTR)s.esp0));
447	pVM->selm.s.Tss.esp1 = s.esp0;
448	pVM->selm.s.Tss.ss1 = s.ss0 \| 1;
449	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
450	}
451	}
452
453	/*
454	* If VME is enabled we need to check if the interrupt redirection bitmap
455	* needs updating.
456	*/
457	if ( offRange >= RT_UOFFSETOF(VBOXTSS, offIoBitmap)
458	&& (CPUMGetGuestCR4(pVCpu) & X86_CR4_VME))
459	{
460	if (offRange - RT_UOFFSETOF(VBOXTSS, offIoBitmap) < sizeof(pGuestTss->offIoBitmap))
461	{
462	uint16_t offIoBitmap = pGuestTss->offIoBitmap;
463	if (offIoBitmap != pVM->selm.s.offGuestIoBitmap)
464	{
465	Log(("TSS offIoBitmap changed: old=%#x new=%#x -> resync in ring-3\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
466	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
467	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
468	}
469	else
470	Log(("TSS offIoBitmap: old=%#x new=%#x [unchanged]\n", pVM->selm.s.offGuestIoBitmap, offIoBitmap));
471	}
472	else
473	{
474	/** @todo not sure how the partial case is handled; probably not allowed */
475	uint32_t offIntRedirBitmap = pVM->selm.s.offGuestIoBitmap - sizeof(pVM->selm.s.Tss.IntRedirBitmap);
476	if ( offIntRedirBitmap <= offRange
477	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) >= offRange + cb
478	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) <= pVM->selm.s.cbGuestTss)
479	{
480	Log(("TSS IntRedirBitmap Changed: offIoBitmap=%x offIntRedirBitmap=%x cbTSS=%x offRange=%x cb=%x\n",
481	pVM->selm.s.offGuestIoBitmap, offIntRedirBitmap, pVM->selm.s.cbGuestTss, offRange, cb));
482
483	/** @todo only update the changed part. */
484	for (uint32_t i = 0; i < sizeof(pVM->selm.s.Tss.IntRedirBitmap) / 8; i++)
485	{
486	rc = selmRCReadTssBits(pVM, &pVM->selm.s.Tss.IntRedirBitmap[i * 8],
487	(uint8_t )pGuestTss + offIntRedirBitmap + i 8, 8);
488	if (rc != VINF_SUCCESS)
489	break;
490	}
491	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSRedir);
492	}
493	}
494	}
495
496	/* Return to ring-3 for a full resync if any of the above fails... (?) */
497	if (rc != VINF_SUCCESS)
498	{
499	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
500	VMCPU_FF_SET(pVCpu, VMCPU_FF_TO_R3);
501	if (RT_SUCCESS(rc))
502	rc = VINF_SUCCESS;
503	}
504
505	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandled);
506	}
507	else
508	{
509	AssertMsg(RT_FAILURE(rc), ("cb=%u rc=%#x\n", cb, rc));
510	VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
511	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSUnhandled);
512	if (rc == VERR_EM_INTERPRETER)
513	rc = VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
514	}
515	return rc;
516	}
517	#endif /* SELM_TRACK_GUEST_TSS_CHANGES */
518
519
520	#ifdef SELM_TRACK_SHADOW_GDT_CHANGES
521	/**
522	* \#PF Virtual Handler callback for Guest write access to the VBox shadow GDT.
523	*
524	* @returns VBox status code (appropriate for trap handling and GC return).
525	* @param pVM Pointer to the VM.
526	* @param uErrorCode CPU Error code.
527	* @param pRegFrame Trap register frame.
528	* @param pvFault The fault address (cr2).
529	* @param pvRange The base address of the handled virtual range.
530	* @param offRange The offset of the access into this range.
531	* (If it's a EIP range this is the EIP, if not it's pvFault.)
532	*/
533	VMMRCDECL(int) selmRCShadowGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
534	{
535	LogRel(("FATAL ERROR: selmRCShadowGDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
536	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
537	return VERR_SELM_SHADOW_GDT_WRITE;
538	}
539	#endif
540
541
542	#ifdef SELM_TRACK_SHADOW_LDT_CHANGES
543	/**
544	* \#PF Virtual Handler callback for Guest write access to the VBox shadow LDT.
545	*
546	* @returns VBox status code (appropriate for trap handling and GC return).
547	* @param pVM Pointer to the VM.
548	* @param uErrorCode CPU Error code.
549	* @param pRegFrame Trap register frame.
550	* @param pvFault The fault address (cr2).
551	* @param pvRange The base address of the handled virtual range.
552	* @param offRange The offset of the access into this range.
553	* (If it's a EIP range this is the EIP, if not it's pvFault.)
554	*/
555	VMMRCDECL(int) selmRCShadowLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
556	{
557	LogRel(("FATAL ERROR: selmRCShadowLDTWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
558	Assert(pvFault - (uintptr_t)pVM->selm.s.pvLdtRC < (unsigned)(65536U + PAGE_SIZE));
559	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
560	return VERR_SELM_SHADOW_LDT_WRITE;
561	}
562	#endif
563
564
565	#ifdef SELM_TRACK_SHADOW_TSS_CHANGES
566	/**
567	* \#PF Virtual Handler callback for Guest write access to the VBox shadow TSS.
568	*
569	* @returns VBox status code (appropriate for trap handling and GC return).
570	* @param pVM Pointer to the VM.
571	* @param uErrorCode CPU Error code.
572	* @param pRegFrame Trap register frame.
573	* @param pvFault The fault address (cr2).
574	* @param pvRange The base address of the handled virtual range.
575	* @param offRange The offset of the access into this range.
576	* (If it's a EIP range this is the EIP, if not it's pvFault.)
577	*/
578	VMMRCDECL(int) selmRCShadowTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
579	{
580	LogRel(("FATAL ERROR: selmRCShadowTSSWriteHandler: eip=%08X pvFault=%RGv pvRange=%RGv\r\n", pRegFrame->eip, pvFault, pvRange));
581	NOREF(pVM); NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
582	return VERR_SELM_SHADOW_TSS_WRITE;
583	}
584	#endif
585

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source: vbox/trunk/src/VBox/VMM/VMMRC/SELMRC.cpp@ 46088

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