TRPMAll.cpp@ 56287

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1	/* $Id: TRPMAll.cpp 56287 2015-06-09 11:15:22Z vboxsync $ */
2	/** @file
3	* TRPM - Trap Monitor - Any Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 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_TRPM
23	#include <VBox/vmm/trpm.h>
24	#include <VBox/vmm/pgm.h>
25	#include <VBox/vmm/mm.h>
26	#include <VBox/vmm/hm.h>
27	#include <VBox/vmm/patm.h>
28	#include <VBox/vmm/selm.h>
29	#include <VBox/vmm/stam.h>
30	#include <VBox/vmm/dbgf.h>
31	#include "TRPMInternal.h"
32	#include <VBox/vmm/vm.h>
33	#include <VBox/err.h>
34	#include <VBox/vmm/em.h>
35	#include <VBox/log.h>
36	#include <iprt/assert.h>
37	#include <iprt/asm.h>
38	#include <iprt/asm-amd64-x86.h>
39	#include <iprt/param.h>
40	#include <iprt/x86.h>
41	#include "internal/pgm.h"
42
43
44
45	#if defined(TRPM_TRACK_GUEST_IDT_CHANGES) && !defined(IN_RING0)
46	/**
47	* \#PF Handler callback for virtual access handler ranges.
48	*
49	* Important to realize that a physical page in a range can have aliases, and
50	* for ALL and WRITE handlers these will also trigger.
51	*
52	* @returns VINF_SUCCESS if the handler have carried out the operation.
53	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
54	* @param pVM Pointer to the VM.
55	* @param pVCpu Pointer to the cross context CPU context for the
56	* calling EMT.
57	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
58	* @param pvPtr The HC mapping of that address.
59	* @param pvBuf What the guest is reading/writing.
60	* @param cbBuf How much it's reading/writing.
61	* @param enmAccessType The access type.
62	* @param enmOrigin The origin of this call.
63	* @param pvUser User argument.
64	*/
65	PGM_ALL_CB2_DECL(VBOXSTRICTRC)
66	trpmGuestIDTWriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf,
67	PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, void *pvUser)
68	{
69	Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
70	Log(("trpmGuestIDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf)); NOREF(GCPtr); NOREF(cbBuf);
71	NOREF(pvPtr); NOREF(pvUser); NOREF(pvBuf); NOREF(enmOrigin); NOREF(pvUser);
72	Assert(!HMIsEnabled(pVM));
73
74	/** @todo Check which IDT entry and keep the update cost low in TRPMR3SyncIDT() and CSAMCheckGates(). */
75	VMCPU_FF_SET(pVCpu, VMCPU_FF_TRPM_SYNC_IDT);
76	# ifdef IN_RC
77	STAM_COUNTER_INC(&pVM->trpm.s.StatRCWriteGuestIDTFault);
78	# endif
79	return VINF_PGM_HANDLER_DO_DEFAULT;
80	}
81	#endif /* TRPM_TRACK_GUEST_IDT_CHANGES && !IN_RING0 */
82
83
84	/**
85	* Query info about the current active trap/interrupt.
86	* If no trap is active active an error code is returned.
87	*
88	* @returns VBox status code.
89	* @param pVCpu Pointer to the VMCPU.
90	* @param pu8TrapNo Where to store the trap number.
91	* @param penmType Where to store the trap type
92	*/
93	VMMDECL(int) TRPMQueryTrap(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT penmType)
94	{
95	/*
96	* Check if we have a trap at present.
97	*/
98	if (pVCpu->trpm.s.uActiveVector != ~0U)
99	{
100	if (pu8TrapNo)
101	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
102	if (penmType)
103	*penmType = pVCpu->trpm.s.enmActiveType;
104	return VINF_SUCCESS;
105	}
106
107	return VERR_TRPM_NO_ACTIVE_TRAP;
108	}
109
110
111	/**
112	* Gets the trap number for the current trap.
113	*
114	* The caller is responsible for making sure there is an active trap which
115	* takes an error code when making this request.
116	*
117	* @returns The current trap number.
118	* @param pVCpu Pointer to the VMCPU.
119	*/
120	VMMDECL(uint8_t) TRPMGetTrapNo(PVMCPU pVCpu)
121	{
122	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
123	return (uint8_t)pVCpu->trpm.s.uActiveVector;
124	}
125
126
127	/**
128	* Gets the error code for the current trap.
129	*
130	* The caller is responsible for making sure there is an active trap which
131	* takes an error code when making this request.
132	*
133	* @returns Error code.
134	* @param pVCpu Pointer to the VMCPU.
135	*/
136	VMMDECL(RTGCUINT) TRPMGetErrorCode(PVMCPU pVCpu)
137	{
138	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
139	#ifdef VBOX_STRICT
140	switch (pVCpu->trpm.s.uActiveVector)
141	{
142	case X86_XCPT_TS:
143	case X86_XCPT_NP:
144	case X86_XCPT_SS:
145	case X86_XCPT_GP:
146	case X86_XCPT_PF:
147	case X86_XCPT_AC:
148	case X86_XCPT_DF:
149	break;
150	default:
151	AssertMsgFailed(("This trap (%#x) doesn't have any error code\n", pVCpu->trpm.s.uActiveVector));
152	break;
153	}
154	#endif
155	return pVCpu->trpm.s.uActiveErrorCode;
156	}
157
158
159	/**
160	* Gets the fault address for the current trap.
161	*
162	* The caller is responsible for making sure there is an active trap 0x0e when
163	* making this request.
164	*
165	* @returns Fault address associated with the trap.
166	* @param pVCpu Pointer to the VMCPU.
167	*/
168	VMMDECL(RTGCUINTPTR) TRPMGetFaultAddress(PVMCPU pVCpu)
169	{
170	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
171	AssertMsg(pVCpu->trpm.s.uActiveVector == X86_XCPT_PF, ("Not page-fault trap!\n"));
172	return pVCpu->trpm.s.uActiveCR2;
173	}
174
175
176	/**
177	* Gets the instruction-length for the current trap (only relevant for software
178	* interrupts and software exceptions #BP and #OF).
179	*
180	* The caller is responsible for making sure there is an active trap 0x0e when
181	* making this request.
182	*
183	* @returns Fault address associated with the trap.
184	* @param pVCpu Pointer to the VMCPU.
185	*/
186	VMMDECL(uint8_t) TRPMGetInstrLength(PVMCPU pVCpu)
187	{
188	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
189	return pVCpu->trpm.s.cbInstr;
190	}
191
192
193	/**
194	* Clears the current active trap/exception/interrupt.
195	*
196	* The caller is responsible for making sure there is an active trap
197	* when making this request.
198	*
199	* @returns VBox status code.
200	* @param pVCpu Pointer to the VMCPU.
201	*/
202	VMMDECL(int) TRPMResetTrap(PVMCPU pVCpu)
203	{
204	/*
205	* Cannot reset non-existing trap!
206	*/
207	if (pVCpu->trpm.s.uActiveVector == ~0U)
208	{
209	AssertMsgFailed(("No active trap!\n"));
210	return VERR_TRPM_NO_ACTIVE_TRAP;
211	}
212
213	/*
214	* Reset it.
215	*/
216	pVCpu->trpm.s.uActiveVector = ~0U;
217	return VINF_SUCCESS;
218	}
219
220
221	/**
222	* Assert trap/exception/interrupt.
223	*
224	* The caller is responsible for making sure there is no active trap
225	* when making this request.
226	*
227	* @returns VBox status code.
228	* @param pVCpu Pointer to the VMCPU.
229	* @param u8TrapNo The trap vector to assert.
230	* @param enmType Trap type.
231	*/
232	VMMDECL(int) TRPMAssertTrap(PVMCPU pVCpu, uint8_t u8TrapNo, TRPMEVENT enmType)
233	{
234	Log2(("TRPMAssertTrap: u8TrapNo=%02x type=%d\n", u8TrapNo, enmType));
235
236	/*
237	* Cannot assert a trap when one is already active.
238	*/
239	if (pVCpu->trpm.s.uActiveVector != ~0U)
240	{
241	AssertMsgFailed(("CPU%d: Active trap %#x\n", pVCpu->idCpu, pVCpu->trpm.s.uActiveVector));
242	return VERR_TRPM_ACTIVE_TRAP;
243	}
244
245	pVCpu->trpm.s.uActiveVector = u8TrapNo;
246	pVCpu->trpm.s.enmActiveType = enmType;
247	pVCpu->trpm.s.uActiveErrorCode = ~(RTGCUINT)0;
248	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
249	pVCpu->trpm.s.cbInstr = UINT8_MAX;
250	return VINF_SUCCESS;
251	}
252
253
254	/**
255	* Assert a page-fault exception.
256	*
257	* The caller is responsible for making sure there is no active trap
258	* when making this request.
259	*
260	* @returns VBox status code.
261	* @param pVCpu Pointer to the VMCPU.
262	* @param uCR2 The new fault address.
263	* @param uErrorCode The error code for the page-fault.
264	*/
265	VMMDECL(int) TRPMAssertXcptPF(PVMCPU pVCpu, RTGCUINTPTR uCR2, RTGCUINT uErrorCode)
266	{
267	Log2(("TRPMAssertXcptPF: uCR2=%RGv uErrorCode=%RGv\n", uCR2, uErrorCode)); /** @todo RTGCUINT to be fixed. */
268
269	/*
270	* Cannot assert a trap when one is already active.
271	*/
272	if (pVCpu->trpm.s.uActiveVector != ~0U)
273	{
274	AssertMsgFailed(("CPU%d: Active trap %#x\n", pVCpu->idCpu, pVCpu->trpm.s.uActiveVector));
275	return VERR_TRPM_ACTIVE_TRAP;
276	}
277
278	pVCpu->trpm.s.uActiveVector = X86_XCPT_PF;
279	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
280	pVCpu->trpm.s.uActiveErrorCode = uErrorCode;
281	pVCpu->trpm.s.uActiveCR2 = uCR2;
282	pVCpu->trpm.s.cbInstr = UINT8_MAX;
283	return VINF_SUCCESS;
284	}
285
286
287	/**
288	* Sets the error code of the current trap.
289	* (This function is for use in trap handlers and such.)
290	*
291	* The caller is responsible for making sure there is an active trap
292	* which takes an errorcode when making this request.
293	*
294	* @param pVCpu Pointer to the VMCPU.
295	* @param uErrorCode The new error code.
296	*/
297	VMMDECL(void) TRPMSetErrorCode(PVMCPU pVCpu, RTGCUINT uErrorCode)
298	{
299	Log2(("TRPMSetErrorCode: uErrorCode=%RGv\n", uErrorCode)); /** @todo RTGCUINT mess! */
300	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
301	pVCpu->trpm.s.uActiveErrorCode = uErrorCode;
302	#ifdef VBOX_STRICT
303	switch (pVCpu->trpm.s.uActiveVector)
304	{
305	case X86_XCPT_TS: case X86_XCPT_NP: case X86_XCPT_SS: case X86_XCPT_GP: case X86_XCPT_PF:
306	AssertMsg(uErrorCode != ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
307	break;
308	case X86_XCPT_AC: case X86_XCPT_DF:
309	AssertMsg(uErrorCode == 0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
310	break;
311	default:
312	AssertMsg(uErrorCode == ~(RTGCUINT)0, ("Invalid uErrorCode=%#x u8TrapNo=%d\n", uErrorCode, pVCpu->trpm.s.uActiveVector));
313	break;
314	}
315	#endif
316	}
317
318
319	/**
320	* Sets the fault address of the current #PF trap. (This function is for use in
321	* trap handlers and such.)
322	*
323	* The caller is responsible for making sure there is an active trap 0e
324	* when making this request.
325	*
326	* @param pVCpu Pointer to the VMCPU.
327	* @param uCR2 The new fault address (cr2 register).
328	*/
329	VMMDECL(void) TRPMSetFaultAddress(PVMCPU pVCpu, RTGCUINTPTR uCR2)
330	{
331	Log2(("TRPMSetFaultAddress: uCR2=%RGv\n", uCR2));
332	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
333	AssertMsg(pVCpu->trpm.s.uActiveVector == X86_XCPT_PF, ("Not trap 0e!\n"));
334	pVCpu->trpm.s.uActiveCR2 = uCR2;
335	}
336
337
338	/**
339	* Sets the instruction-length of the current trap (relevant for software
340	* interrupts and software exceptions like #BP, #OF).
341	*
342	* The caller is responsible for making sure there is an active trap 0e
343	* when making this request.
344	*
345	* @param pVCpu Pointer to the VMCPU.
346	* @param cbInstr The instruction length.
347	*/
348	VMMDECL(void) TRPMSetInstrLength(PVMCPU pVCpu, uint8_t cbInstr)
349	{
350	Log2(("TRPMSetInstrLength: cbInstr=%u\n", cbInstr));
351	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
352	AssertMsg( pVCpu->trpm.s.enmActiveType == TRPM_SOFTWARE_INT
353	\|\| ( pVCpu->trpm.s.enmActiveType == TRPM_TRAP
354	&& ( pVCpu->trpm.s.uActiveVector == X86_XCPT_BP
355	\|\| pVCpu->trpm.s.uActiveVector == X86_XCPT_OF)),
356	("Invalid trap type %#x\n", pVCpu->trpm.s.enmActiveType));
357	pVCpu->trpm.s.cbInstr = cbInstr;
358	}
359
360
361	/**
362	* Checks if the current active trap/interrupt/exception/fault/whatever is a software
363	* interrupt or not.
364	*
365	* The caller is responsible for making sure there is an active trap
366	* when making this request.
367	*
368	* @returns true if software interrupt, false if not.
369	*
370	* @param pVCpu Pointer to the VMCPU.
371	*/
372	VMMDECL(bool) TRPMIsSoftwareInterrupt(PVMCPU pVCpu)
373	{
374	AssertMsg(pVCpu->trpm.s.uActiveVector != ~0U, ("No active trap!\n"));
375	return (pVCpu->trpm.s.enmActiveType == TRPM_SOFTWARE_INT);
376	}
377
378
379	/**
380	* Check if there is an active trap.
381	*
382	* @returns true if trap active, false if not.
383	* @param pVCpu Pointer to the VMCPU.
384	*/
385	VMMDECL(bool) TRPMHasTrap(PVMCPU pVCpu)
386	{
387	return pVCpu->trpm.s.uActiveVector != ~0U;
388	}
389
390
391	/**
392	* Query all info about the current active trap/interrupt.
393	* If no trap is active active an error code is returned.
394	*
395	* @returns VBox status code.
396	* @param pVCpu Pointer to the VMCPU.
397	* @param pu8TrapNo Where to store the trap number.
398	* @param pEnmType Where to store the trap type
399	* @param puErrorCode Where to store the error code associated with some traps.
400	* ~0U is stored if the trap has no error code.
401	* @param puCR2 Where to store the CR2 associated with a trap 0E.
402	* @param pcbInstr Where to store the instruction-length
403	* associated with some traps.
404	*/
405	VMMDECL(int) TRPMQueryTrapAll(PVMCPU pVCpu, uint8_t pu8TrapNo, TRPMEVENT pEnmType, PRTGCUINT puErrorCode, PRTGCUINTPTR puCR2,
406	uint8_t *pcbInstr)
407	{
408	/*
409	* Check if we have a trap at present.
410	*/
411	if (pVCpu->trpm.s.uActiveVector == ~0U)
412	return VERR_TRPM_NO_ACTIVE_TRAP;
413
414	if (pu8TrapNo)
415	*pu8TrapNo = (uint8_t)pVCpu->trpm.s.uActiveVector;
416	if (pEnmType)
417	*pEnmType = pVCpu->trpm.s.enmActiveType;
418	if (puErrorCode)
419	*puErrorCode = pVCpu->trpm.s.uActiveErrorCode;
420	if (puCR2)
421	*puCR2 = pVCpu->trpm.s.uActiveCR2;
422	if (pcbInstr)
423	*pcbInstr = pVCpu->trpm.s.cbInstr;
424	return VINF_SUCCESS;
425	}
426
427
428	/**
429	* Save the active trap.
430	*
431	* This routine useful when doing try/catch in the hypervisor.
432	* Any function which uses temporary trap handlers should
433	* probably also use this facility to save the original trap.
434	*
435	* @param pVM Pointer to the VM.
436	*/
437	VMMDECL(void) TRPMSaveTrap(PVMCPU pVCpu)
438	{
439	pVCpu->trpm.s.uSavedVector = pVCpu->trpm.s.uActiveVector;
440	pVCpu->trpm.s.enmSavedType = pVCpu->trpm.s.enmActiveType;
441	pVCpu->trpm.s.uSavedErrorCode = pVCpu->trpm.s.uActiveErrorCode;
442	pVCpu->trpm.s.uSavedCR2 = pVCpu->trpm.s.uActiveCR2;
443	pVCpu->trpm.s.cbSavedInstr = pVCpu->trpm.s.cbInstr;
444	}
445
446
447	/**
448	* Restore a saved trap.
449	*
450	* Multiple restores of a saved trap is possible.
451	*
452	* @param pVM Pointer to the VM.
453	*/
454	VMMDECL(void) TRPMRestoreTrap(PVMCPU pVCpu)
455	{
456	pVCpu->trpm.s.uActiveVector = pVCpu->trpm.s.uSavedVector;
457	pVCpu->trpm.s.enmActiveType = pVCpu->trpm.s.enmSavedType;
458	pVCpu->trpm.s.uActiveErrorCode = pVCpu->trpm.s.uSavedErrorCode;
459	pVCpu->trpm.s.uActiveCR2 = pVCpu->trpm.s.uSavedCR2;
460	pVCpu->trpm.s.cbInstr = pVCpu->trpm.s.cbSavedInstr;
461	}
462
463
464	#ifdef VBOX_WITH_RAW_MODE_NOT_R0
465	/**
466	* Forward trap or interrupt to the guest's handler
467	*
468	*
469	* @returns VBox status code.
470	* or does not return at all (when the trap is actually forwarded)
471	*
472	* @param pVM Pointer to the VM.
473	* @param pRegFrame Pointer to the register frame for the trap.
474	* @param iGate Trap or interrupt gate number
475	* @param cbInstr Instruction size (only relevant for software interrupts)
476	* @param enmError TRPM_TRAP_HAS_ERRORCODE or TRPM_TRAP_NO_ERRORCODE.
477	* @param enmType TRPM event type
478	* @param iOrgTrap The original trap.
479	* @internal
480	*/
481	VMMDECL(int) TRPMForwardTrap(PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, uint32_t iGate, uint32_t cbInstr,
482	TRPMERRORCODE enmError, TRPMEVENT enmType, int32_t iOrgTrap)
483	{
484	AssertReturn(!HMIsEnabled(pVCpu->CTX_SUFF(pVM)), VERR_TRPM_HM_IPE);
485	#ifdef TRPM_FORWARD_TRAPS_IN_GC
486	PVM pVM = pVCpu->CTX_SUFF(pVM);
487	X86EFLAGS eflags;
488	Assert(pVM->cCpus == 1);
489
490	STAM_PROFILE_ADV_START(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
491
492	# if defined(VBOX_STRICT) \|\| defined(LOG_ENABLED)
493	if (pRegFrame->eflags.Bits.u1VM)
494	Log(("TRPMForwardTrap-VM: eip=%04X:%04X iGate=%d\n", pRegFrame->cs.Sel, pRegFrame->eip, iGate));
495	else
496	Log(("TRPMForwardTrap: eip=%04X:%08X iGate=%d\n", pRegFrame->cs.Sel, pRegFrame->eip, iGate));
497
498	switch (iGate) {
499	case X86_XCPT_PF:
500	if (pRegFrame->eip == pVCpu->trpm.s.uActiveCR2)
501	{
502	RTGCPTR pCallerGC;
503	# ifdef IN_RC
504	int rc = MMGCRamRead(pVM, &pCallerGC, (void *)pRegFrame->esp, sizeof(pCallerGC));
505	# else
506	int rc = PGMPhysSimpleReadGCPtr(pVCpu, &pCallerGC, (RTGCPTR)pRegFrame->esp, sizeof(pCallerGC));
507	# endif
508	if (RT_SUCCESS(rc))
509	Log(("TRPMForwardTrap: caller=%RGv\n", pCallerGC));
510	}
511	/* no break */
512	case X86_XCPT_DF:
513	case X86_XCPT_TS:
514	case X86_XCPT_NP:
515	case X86_XCPT_SS:
516	case X86_XCPT_GP:
517	case X86_XCPT_AC:
518	Assert(enmError == TRPM_TRAP_HAS_ERRORCODE \|\| enmType == TRPM_SOFTWARE_INT);
519	break;
520
521	default:
522	Assert(enmError == TRPM_TRAP_NO_ERRORCODE);
523	break;
524	}
525	# endif /* VBOX_STRICT \|\| LOG_ENABLED */
526	#ifdef IN_RC
527	AssertReturn(CPUMIsGuestInRawMode(pVCpu), VINF_EM_RESCHEDULE);
528	#endif
529
530	/* Retrieve the eflags including the virtualized bits. */
531	/* Note: hackish as the cpumctxcore structure doesn't contain the right value */
532	eflags.u32 = CPUMRawGetEFlags(pVCpu);
533
534	/* VMCPU_FF_INHIBIT_INTERRUPTS should be cleared upfront or don't call this function at all for dispatching hardware interrupts. */
535	Assert(enmType != TRPM_HARDWARE_INT \|\| !VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS));
536
537	/*
538	* If it's a real guest trap and the guest's page fault handler is marked as safe for GC execution, then we call it directly.
539	* Well, only if the IF flag is set.
540	*/
541	/** @todo if the trap handler was modified and marked invalid, then we should now go back to the host context and install a new patch. */
542	if ( pVM->trpm.s.aGuestTrapHandler[iGate]
543	&& (eflags.Bits.u1IF)
544	#ifndef VBOX_RAW_V86
545	&& !(eflags.Bits.u1VM) /** @todo implement when needed (illegal for same privilege level transfers). */
546	#endif
547	&& !PATMIsPatchGCAddr(pVM, pRegFrame->eip)
548	)
549	{
550	uint16_t cbIDT;
551	RTGCPTR GCPtrIDT = (RTGCPTR)CPUMGetGuestIDTR(pVCpu, &cbIDT);
552	uint32_t cpl;
553	VBOXIDTE GuestIdte;
554	RTGCPTR pIDTEntry;
555	int rc;
556
557	Assert(PATMAreInterruptsEnabledByCtx(pVM, CPUMCTX_FROM_CORE(pRegFrame)));
558	Assert(!VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_SELM_SYNC_GDT \| VMCPU_FF_SELM_SYNC_LDT \| VMCPU_FF_TRPM_SYNC_IDT \| VMCPU_FF_SELM_SYNC_TSS));
559
560	if (GCPtrIDT && iGate * sizeof(VBOXIDTE) >= cbIDT)
561	goto failure;
562
563	/* Get the current privilege level. */
564	cpl = CPUMGetGuestCPL(pVCpu);
565
566	/*
567	* BIG TODO: The checks are not complete. see trap and interrupt dispatching section in Intel docs for details
568	* All very obscure, but still necessary.
569	* Currently only some CS & TSS selector checks are missing.
570	*
571	*/
572	pIDTEntry = (RTGCPTR)((RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate);
573	#ifdef IN_RC
574	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
575	#else
576	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
577	#endif
578	if (RT_FAILURE(rc))
579	{
580	/* The page might be out of sync. / /* @todo might cross a page boundary) */
581	Log(("Page %RGv out of sync -> prefetch and try again\n", pIDTEntry));
582	rc = PGMPrefetchPage(pVCpu, pIDTEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
583	if (rc != VINF_SUCCESS)
584	{
585	Log(("TRPMForwardTrap: PGMPrefetchPage failed with rc=%Rrc\n", rc));
586	goto failure;
587	}
588	#ifdef IN_RC
589	rc = MMGCRamRead(pVM, &GuestIdte, (void *)(uintptr_t)pIDTEntry, sizeof(GuestIdte));
590	#else
591	rc = PGMPhysSimpleReadGCPtr(pVCpu, &GuestIdte, pIDTEntry, sizeof(GuestIdte));
592	#endif
593	}
594	if ( RT_SUCCESS(rc)
595	&& GuestIdte.Gen.u1Present
596	&& (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
597	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0)
598	&& (GuestIdte.Gen.u16SegSel & 0xfffc) /* must not be zero */
599	&& (enmType == TRPM_TRAP \|\| enmType == TRPM_HARDWARE_INT \|\| cpl <= GuestIdte.Gen.u2DPL) /* CPL <= DPL if software int */
600	)
601	{
602	RTGCPTR pHandler, dummy;
603	RTGCPTR pTrapStackGC;
604
605	pHandler = (RTGCPTR)VBOXIDTE_OFFSET(GuestIdte);
606
607	/* Note: SELMValidateAndConvertCSAddr checks for code type, memory type, selector validity. */
608	/** @todo dpl <= cpl else GPF */
609
610	/* Note: don't use current eflags as we might be in V86 mode and the IDT always contains protected mode selectors */
611	X86EFLAGS fakeflags;
612	fakeflags.u32 = 0;
613
614	rc = SELMValidateAndConvertCSAddr(pVCpu, fakeflags, 0, GuestIdte.Gen.u16SegSel, NULL, pHandler, &dummy);
615	if (rc == VINF_SUCCESS)
616	{
617	VBOXGDTR gdtr = {0, 0};
618	bool fConforming = false;
619	int idx = 0;
620	uint32_t dpl;
621	uint32_t ss_r0;
622	uint32_t esp_r0;
623	X86DESC Desc;
624	RTGCPTR pGdtEntry;
625
626	CPUMGetGuestGDTR(pVCpu, &gdtr);
627	Assert(gdtr.pGdt && gdtr.cbGdt > GuestIdte.Gen.u16SegSel);
628
629	if (!gdtr.pGdt)
630	goto failure;
631
632	pGdtEntry = gdtr.pGdt + (GuestIdte.Gen.u16SegSel >> X86_SEL_SHIFT) * sizeof(X86DESC);
633	#ifdef IN_RC
634	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
635	#else
636	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
637	#endif
638	if (RT_FAILURE(rc))
639	{
640	/* The page might be out of sync. / /* @todo might cross a page boundary) */
641	Log(("Page %RGv out of sync -> prefetch and try again\n", pGdtEntry));
642	rc = PGMPrefetchPage(pVCpu, pGdtEntry); /** @todo r=bird: rainy day: this isn't entirely safe because of access bit virtualiziation and CSAM. */
643	if (rc != VINF_SUCCESS)
644	{
645	Log(("PGMPrefetchPage failed with rc=%Rrc\n", rc));
646	goto failure;
647	}
648	#ifdef IN_RC
649	rc = MMGCRamRead(pVM, &Desc, (void *)(uintptr_t)pGdtEntry, sizeof(Desc));
650	#else
651	rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, pGdtEntry, sizeof(Desc));
652	#endif
653	if (RT_FAILURE(rc))
654	{
655	Log(("MMGCRamRead failed with %Rrc\n", rc));
656	goto failure;
657	}
658	}
659
660	if (Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
661	{
662	Log(("Conforming code selector\n"));
663	fConforming = true;
664	}
665	/** @todo check descriptor type!! */
666
667	dpl = Desc.Gen.u2Dpl;
668
669	if (!fConforming && dpl < cpl) /* to inner privilege level */
670	{
671	rc = SELMGetRing1Stack(pVM, &ss_r0, &esp_r0);
672	if (RT_FAILURE(rc))
673	goto failure;
674
675	Assert((ss_r0 & X86_SEL_RPL) == 1);
676
677	if ( !esp_r0
678	\|\| !ss_r0
679	\|\| (ss_r0 & X86_SEL_RPL) != ((dpl == 0) ? 1 : dpl)
680	\|\| SELMToFlatBySelEx(pVCpu, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1,
681	(PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS
682	)
683	{
684	Log(("Invalid ring 0 stack %04X:%08RX32\n", ss_r0, esp_r0));
685	goto failure;
686	}
687	}
688	else
689	if (fConforming \|\| dpl == cpl) /* to the same privilege level */
690	{
691	ss_r0 = pRegFrame->ss.Sel;
692	esp_r0 = pRegFrame->esp;
693
694	if ( eflags.Bits.u1VM /* illegal */
695	\|\| SELMToFlatBySelEx(pVCpu, fakeflags, ss_r0, (RTGCPTR)esp_r0, SELMTOFLAT_FLAGS_CPL1,
696	(PRTGCPTR)&pTrapStackGC, NULL) != VINF_SUCCESS)
697	{
698	AssertMsgFailed(("Invalid stack %04X:%08RX32??? (VM=%d)\n", ss_r0, esp_r0, eflags.Bits.u1VM));
699	goto failure;
700	}
701	}
702	else
703	{
704	Log(("Invalid cpl-dpl combo %d vs %d\n", cpl, dpl));
705	goto failure;
706	}
707	/*
708	* Build trap stack frame on guest handler's stack
709	*/
710	uint32_t *pTrapStack;
711	#ifdef IN_RC
712	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) != 0);
713	/* Check maximum amount we need (10 when executing in V86 mode) */
714	rc = PGMVerifyAccess(pVCpu, (RTGCUINTPTR)pTrapStackGC - 10sizeof(uint32_t), 10 sizeof(uint32_t), X86_PTE_RW);
715	pTrapStack = (uint32_t *)(uintptr_t)pTrapStackGC;
716	#else
717	Assert(eflags.Bits.u1VM \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) == 0 \|\| (pRegFrame->ss.Sel & X86_SEL_RPL) == 3 \|\| (EMIsRawRing1Enabled(pVM) && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1));
718	/* Check maximum amount we need (10 when executing in V86 mode) */
719	if ((pTrapStackGC >> PAGE_SHIFT) != ((pTrapStackGC - 10sizeof(uint32_t)) >> PAGE_SHIFT)) / fail if we cross a page boundary */
720	goto failure;
721	PGMPAGEMAPLOCK PageMappingLock;
722	rc = PGMPhysGCPtr2CCPtr(pVCpu, pTrapStackGC, (void **)&pTrapStack, &PageMappingLock);
723	if (RT_FAILURE(rc))
724	{
725	AssertRC(rc);
726	goto failure;
727	}
728	#endif
729	if (rc == VINF_SUCCESS)
730	{
731	/** if eflags.Bits.u1VM then push gs, fs, ds, es */
732	if (eflags.Bits.u1VM)
733	{
734	Log(("TRAP%02X: (VM) Handler %04X:%RGv Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss.Sel & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
735	pTrapStack[--idx] = pRegFrame->gs.Sel;
736	pTrapStack[--idx] = pRegFrame->fs.Sel;
737	pTrapStack[--idx] = pRegFrame->ds.Sel;
738	pTrapStack[--idx] = pRegFrame->es.Sel;
739
740	/* clear ds, es, fs & gs in current context */
741	pRegFrame->ds.Sel = pRegFrame->es.Sel = pRegFrame->fs.Sel = pRegFrame->gs.Sel = 0;
742	}
743	else
744	Log(("TRAP%02X: Handler %04X:%RGv Stack %04X:%08X RPL=%d CR2=%08X\n", iGate, GuestIdte.Gen.u16SegSel, pHandler, ss_r0, esp_r0, (pRegFrame->ss.Sel & X86_SEL_RPL), pVCpu->trpm.s.uActiveCR2));
745
746	if (!fConforming && dpl < cpl)
747	{
748	#ifdef IN_RC /* Only in RC we still see tracing of our ring modifications. */
749	if ( (pRegFrame->ss.Sel & X86_SEL_RPL) == 1
750	&& !eflags.Bits.u1VM)
751	pTrapStack[--idx] = pRegFrame->ss.Sel & ~1; /* Mask away traces of raw ring 0 execution (ring 1). */
752	else if ( EMIsRawRing1Enabled(pVM)
753	&& (pRegFrame->ss.Sel & X86_SEL_RPL) == 2)
754	pTrapStack[--idx] = (pRegFrame->ss.Sel & ~2) \| 1; /* Mask away traces of raw ring 1 execution (ring 2). */
755	else
756	#endif /* IN_RC */
757	pTrapStack[--idx] = pRegFrame->ss.Sel;
758
759	pTrapStack[--idx] = pRegFrame->esp;
760	}
761
762	/* Note: We use the eflags copy, that includes the virtualized bits! */
763	/* Note: Not really necessary as we grab include those bits in the trap/irq handler trampoline */
764	pTrapStack[--idx] = eflags.u32;
765
766	#ifdef IN_RC /* Only in RC mode we still see tracing of our ring modifications */
767	if ( (pRegFrame->cs.Sel & X86_SEL_RPL) == 1
768	&& !eflags.Bits.u1VM)
769	pTrapStack[--idx] = pRegFrame->cs.Sel & ~1; /* Mask away traces of raw ring execution (ring 1). */
770	else if ( EMIsRawRing1Enabled(pVM)
771	&& (pRegFrame->cs.Sel & X86_SEL_RPL) == 2)
772	pTrapStack[--idx] = (pRegFrame->cs.Sel & ~2) \| 1; /* Mask away traces of raw ring 1 execution (ring 2). */
773	else
774	#endif /* IN_RC */
775	pTrapStack[--idx] = pRegFrame->cs.Sel;
776
777	if (enmType == TRPM_SOFTWARE_INT)
778	{
779	Assert(cbInstr);
780	pTrapStack[--idx] = pRegFrame->eip + cbInstr; /* return address = next instruction */
781	}
782	else
783	pTrapStack[--idx] = pRegFrame->eip;
784
785	if (enmError == TRPM_TRAP_HAS_ERRORCODE)
786	{
787	pTrapStack[--idx] = pVCpu->trpm.s.uActiveErrorCode;
788	}
789
790	Assert(esp_r0 > -idx*sizeof(uint32_t));
791	/* Adjust ESP accordingly */
792	esp_r0 += idx*sizeof(uint32_t);
793
794	/* Mask away dangerous flags for the trap/interrupt handler. */
795	eflags.u32 &= ~(X86_EFL_TF \| X86_EFL_VM \| X86_EFL_RF \| X86_EFL_NT);
796	#ifdef DEBUG
797	if (DBGFIsStepping(pVCpu))
798	eflags.u32 \|= X86_EFL_TF;
799	#endif
800
801	/* Turn off interrupts for interrupt gates. */
802	if (GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
803	eflags.Bits.u1IF = 0;
804
805	CPUMRawSetEFlags(pVCpu, eflags.u32);
806
807	#ifdef DEBUG
808	for (int j = idx; j < 0; j++)
809	LogFlow(("Stack %RRv pos %02d: %08x\n", &pTrapStack[j], j, pTrapStack[j]));
810
811	Log4(("eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
812	"eip=%08x esp=%08x ebp=%08x iopl=%d\n"
813	"cs=%04x ds=%04x es=%04x fs=%04x gs=%04x eflags=%08x\n",
814	pRegFrame->eax, pRegFrame->ebx, pRegFrame->ecx, pRegFrame->edx, pRegFrame->esi, pRegFrame->edi,
815	pRegFrame->eip, pRegFrame->esp, pRegFrame->ebp, eflags.Bits.u2IOPL,
816	pRegFrame->cs.Sel, pRegFrame->ds.Sel, pRegFrame->es.Sel,
817	pRegFrame->fs.Sel, pRegFrame->gs.Sel, eflags.u32));
818	#endif
819
820	Log(("TRPM: PATM Handler %RRv Adjusted stack %08X new EFLAGS=%08X/%08x idx=%d dpl=%d cpl=%d\n",
821	pVM->trpm.s.aGuestTrapHandler[iGate], esp_r0, eflags.u32, CPUMRawGetEFlags(pVCpu), idx, dpl, cpl));
822
823	/* Make sure the internal guest context structure is up-to-date. */
824	if (iGate == X86_XCPT_PF)
825	CPUMSetGuestCR2(pVCpu, pVCpu->trpm.s.uActiveCR2);
826
827	#ifdef IN_RC
828	/* paranoia */
829	Assert(pRegFrame->eflags.Bits.u1IF == 1);
830	eflags.Bits.u1IF = 1;
831	Assert(pRegFrame->eflags.Bits.u2IOPL == 0);
832	eflags.Bits.u2IOPL = 0;
833
834	Assert(eflags.Bits.u1IF);
835	Assert(eflags.Bits.u2IOPL == 0);
836	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF(paStatForwardedIRQ)[iGate]);
837	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
838	if (iOrgTrap >= 0 && iOrgTrap < (int)RT_ELEMENTS(pVM->trpm.s.aStatGCTraps))
839	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[iOrgTrap], o);
840
841	PGMRZDynMapReleaseAutoSet(pVCpu);
842	CPUMGCCallGuestTrapHandler(pRegFrame, GuestIdte.Gen.u16SegSel \| 1, pVM->trpm.s.aGuestTrapHandler[iGate],
843	eflags.u32, ss_r0, (RTRCPTR)esp_r0);
844	/* does not return */
845	#else
846
847	Assert(!CPUMIsGuestInRawMode(pVCpu));
848	pRegFrame->eflags.u32 = eflags.u32;
849	pRegFrame->eip = pVM->trpm.s.aGuestTrapHandler[iGate];
850	pRegFrame->cs.Sel = GuestIdte.Gen.u16SegSel;
851	pRegFrame->esp = esp_r0;
852	pRegFrame->ss.Sel = ss_r0 & ~X86_SEL_RPL; /* set rpl to ring 0 */
853	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
854	PGMPhysReleasePageMappingLock(pVM, &PageMappingLock);
855	NOREF(iOrgTrap);
856	return VINF_SUCCESS;
857	#endif
858	}
859	else
860	Log(("TRAP%02X: PGMVerifyAccess %RGv failed with %Rrc -> forward to REM\n", iGate, pTrapStackGC, rc));
861	}
862	else
863	Log(("SELMValidateAndConvertCSAddr failed with %Rrc\n", rc));
864	}
865	else
866	Log(("MMRamRead %RGv size %d failed with %Rrc\n", (RTGCUINTPTR)GCPtrIDT + sizeof(VBOXIDTE) * iGate, sizeof(GuestIdte), rc));
867	}
868	else
869	{
870	Log(("Refused to forward trap: eflags=%08x IF=%d\n", eflags.u32, eflags.Bits.u1IF));
871	#ifdef VBOX_WITH_STATISTICS
872	if (pVM->trpm.s.aGuestTrapHandler[iGate] == TRPM_INVALID_HANDLER)
873	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
874	else if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
875	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailPatchAddr);
876	#endif
877	}
878	failure:
879	STAM_COUNTER_INC(&pVM->trpm.s.CTX_SUFF_Z(StatForwardFail));
880	STAM_PROFILE_ADV_STOP(&pVM->trpm.s.CTX_SUFF_Z(StatForwardProf), a);
881
882	Log(("TRAP%02X: forwarding to REM (ss rpl=%d eflags=%08X VMIF=%d handler=%08X\n", iGate, pRegFrame->ss.Sel & X86_SEL_RPL, pRegFrame->eflags.u32, PATMAreInterruptsEnabledByCtx(pVM, CPUMCTX_FROM_CORE(pRegFrame)), pVM->trpm.s.aGuestTrapHandler[iGate]));
883	#endif
884	return VINF_EM_RAW_GUEST_TRAP;
885	}
886	#endif /* VBOX_WITH_RAW_MODE_NOT_R0 */
887
888
889	/**
890	* Raises a cpu exception which doesn't take an error code.
891	*
892	* This function may or may not dispatch the exception before returning.
893	*
894	* @returns VBox status code fit for scheduling.
895	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
896	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
897	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
898	*
899	* @param pVM Pointer to the VM.
900	* @param pCtxCore The CPU context core.
901	* @param enmXcpt The exception.
902	*/
903	VMMDECL(int) TRPMRaiseXcpt(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt)
904	{
905	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt));
906	NOREF(pCtxCore);
907	/** @todo dispatch the trap. */
908	pVCpu->trpm.s.uActiveVector = enmXcpt;
909	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
910	pVCpu->trpm.s.uActiveErrorCode = 0xdeadbeef;
911	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
912	pVCpu->trpm.s.cbInstr = UINT8_MAX;
913	return VINF_EM_RAW_GUEST_TRAP;
914	}
915
916
917	/**
918	* Raises a cpu exception with an errorcode.
919	*
920	* This function may or may not dispatch the exception before returning.
921	*
922	* @returns VBox status code fit for scheduling.
923	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
924	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
925	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
926	*
927	* @param pVM Pointer to the VM.
928	* @param pCtxCore The CPU context core.
929	* @param enmXcpt The exception.
930	* @param uErr The error code.
931	*/
932	VMMDECL(int) TRPMRaiseXcptErr(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr)
933	{
934	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt, uErr));
935	NOREF(pCtxCore);
936	/** @todo dispatch the trap. */
937	pVCpu->trpm.s.uActiveVector = enmXcpt;
938	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
939	pVCpu->trpm.s.uActiveErrorCode = uErr;
940	pVCpu->trpm.s.uActiveCR2 = 0xdeadface;
941	pVCpu->trpm.s.cbInstr = UINT8_MAX;
942	return VINF_EM_RAW_GUEST_TRAP;
943	}
944
945
946	/**
947	* Raises a cpu exception with an errorcode and CR2.
948	*
949	* This function may or may not dispatch the exception before returning.
950	*
951	* @returns VBox status code fit for scheduling.
952	* @retval VINF_EM_RAW_GUEST_TRAP if the exception was left pending.
953	* @retval VINF_TRPM_XCPT_DISPATCHED if the exception was raised and dispatched for raw-mode execution.
954	* @retval VINF_EM_RESCHEDULE_REM if the exception was dispatched and cannot be executed in raw-mode.
955	*
956	* @param pVM Pointer to the VM.
957	* @param pCtxCore The CPU context core.
958	* @param enmXcpt The exception.
959	* @param uErr The error code.
960	* @param uCR2 The CR2 value.
961	*/
962	VMMDECL(int) TRPMRaiseXcptErrCR2(PVMCPU pVCpu, PCPUMCTXCORE pCtxCore, X86XCPT enmXcpt, uint32_t uErr, RTGCUINTPTR uCR2)
963	{
964	LogFlow(("TRPMRaiseXcptErr: cs:eip=%RTsel:%RX32 enmXcpt=%#x uErr=%RX32 uCR2=%RGv\n", pCtxCore->cs.Sel, pCtxCore->eip, enmXcpt, uErr, uCR2));
965	NOREF(pCtxCore);
966	/** @todo dispatch the trap. */
967	pVCpu->trpm.s.uActiveVector = enmXcpt;
968	pVCpu->trpm.s.enmActiveType = TRPM_TRAP;
969	pVCpu->trpm.s.uActiveErrorCode = uErr;
970	pVCpu->trpm.s.uActiveCR2 = uCR2;
971	pVCpu->trpm.s.cbInstr = UINT8_MAX;
972	return VINF_EM_RAW_GUEST_TRAP;
973	}
974
975
976	#ifdef VBOX_WITH_RAW_MODE
977	/**
978	* Clear guest trap/interrupt gate handler
979	*
980	* @returns VBox status code.
981	* @param pVM Pointer to the VM.
982	* @param iTrap Interrupt/trap number.
983	*/
984	VMMDECL(int) trpmClearGuestTrapHandler(PVM pVM, unsigned iTrap)
985	{
986	AssertReturn(!HMIsEnabled(pVM), VERR_TRPM_HM_IPE);
987	AssertMsgReturn(iTrap < RT_ELEMENTS(pVM->trpm.s.aIdt), ("Illegal gate number %d!\n", iTrap), VERR_INVALID_PARAMETER);
988
989	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
990	# ifdef IN_RING3
991	trpmR3ClearPassThroughHandler(pVM, iTrap);
992	# else
993	AssertFailed();
994	# endif
995
996	pVM->trpm.s.aGuestTrapHandler[iTrap] = TRPM_INVALID_HANDLER;
997	return VINF_SUCCESS;
998	}
999	#endif /* VBOX_WITH_RAW_MODE */
1000

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source: vbox/trunk/src/VBox/VMM/VMMAll/TRPMAll.cpp@ 56287

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