IOMAllMMIO.cpp@ 72493

Last change on this file since 72493 was 72493, checked in by vboxsync, 6 years ago
IEM,REM,++: Removed code related IEM_VERIFICATION_MODE and friends because it (1) adds aditional complexity and mess, (2) suffers bit rot as it's infrequently used, and (3) prevents using pVCpu->cpum.GstCtx directly.
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File size: 46.2 KB

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1	/* $Id: IOMAllMMIO.cpp 72493 2018-06-10 16:08:44Z vboxsync $ */
2	/** @file
3	* IOM - Input / Output Monitor - Any Context, MMIO & String I/O.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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_IOM
23	#include <VBox/vmm/iom.h>
24	#include <VBox/vmm/cpum.h>
25	#include <VBox/vmm/pgm.h>
26	#include <VBox/vmm/selm.h>
27	#include <VBox/vmm/mm.h>
28	#include <VBox/vmm/em.h>
29	#include <VBox/vmm/pgm.h>
30	#include <VBox/vmm/trpm.h>
31	#include <VBox/vmm/iem.h>
32	#include "IOMInternal.h"
33	#include <VBox/vmm/vm.h>
34	#include <VBox/vmm/vmm.h>
35	#include <VBox/vmm/hm.h>
36	#include "IOMInline.h"
37
38	#include <VBox/dis.h>
39	#include <VBox/disopcode.h>
40	#include <VBox/vmm/pdmdev.h>
41	#include <VBox/param.h>
42	#include <VBox/err.h>
43	#include <iprt/assert.h>
44	#include <VBox/log.h>
45	#include <iprt/asm.h>
46	#include <iprt/string.h>
47
48
49
50	#ifndef IN_RING3
51	/**
52	* Defers a pending MMIO write to ring-3.
53	*
54	* @returns VINF_IOM_R3_MMIO_COMMIT_WRITE
55	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
56	* @param GCPhys The write address.
57	* @param pvBuf The bytes being written.
58	* @param cbBuf How many bytes.
59	* @param pRange The range, if resolved.
60	*/
61	static VBOXSTRICTRC iomMmioRing3WritePending(PVMCPU pVCpu, RTGCPHYS GCPhys, void const *pvBuf, size_t cbBuf, PIOMMMIORANGE pRange)
62	{
63	Log5(("iomMmioRing3WritePending: %RGp LB %#x\n", GCPhys, cbBuf));
64	if (pVCpu->iom.s.PendingMmioWrite.cbValue == 0)
65	{
66	pVCpu->iom.s.PendingMmioWrite.GCPhys = GCPhys;
67	AssertReturn(cbBuf <= sizeof(pVCpu->iom.s.PendingMmioWrite.abValue), VERR_IOM_MMIO_IPE_2);
68	pVCpu->iom.s.PendingMmioWrite.cbValue = (uint32_t)cbBuf;
69	memcpy(pVCpu->iom.s.PendingMmioWrite.abValue, pvBuf, cbBuf);
70	}
71	else
72	{
73	/*
74	* Join with pending if adjecent.
75	*
76	* This may happen if the stack overflows into MMIO territory and RSP/ESP/SP
77	* isn't aligned. IEM will bounce buffer the access and do one write for each
78	* page. We get here when the 2nd page part is written.
79	*/
80	uint32_t const cbOldValue = pVCpu->iom.s.PendingMmioWrite.cbValue;
81	AssertMsgReturn(GCPhys == pVCpu->iom.s.PendingMmioWrite.GCPhys + cbOldValue,
82	("pending %RGp LB %#x; incoming %RGp LB %#x\n",
83	pVCpu->iom.s.PendingMmioWrite.GCPhys, cbOldValue, GCPhys, cbBuf),
84	VERR_IOM_MMIO_IPE_1);
85	AssertReturn(cbBuf <= sizeof(pVCpu->iom.s.PendingMmioWrite.abValue) - cbOldValue, VERR_IOM_MMIO_IPE_2);
86	pVCpu->iom.s.PendingMmioWrite.cbValue = cbOldValue + (uint32_t)cbBuf;
87	memcpy(&pVCpu->iom.s.PendingMmioWrite.abValue[cbOldValue], pvBuf, cbBuf);
88	}
89
90	VMCPU_FF_SET(pVCpu, VMCPU_FF_IOM);
91	RT_NOREF_PV(pRange);
92	return VINF_IOM_R3_MMIO_COMMIT_WRITE;
93	}
94	#endif
95
96
97	/**
98	* Deals with complicated MMIO writes.
99	*
100	* Complicated means unaligned or non-dword/qword sized accesses depending on
101	* the MMIO region's access mode flags.
102	*
103	* @returns Strict VBox status code. Any EM scheduling status code,
104	* VINF_IOM_R3_MMIO_WRITE, VINF_IOM_R3_MMIO_READ_WRITE or
105	* VINF_IOM_R3_MMIO_READ may be returned.
106	*
107	* @param pVM The cross context VM structure.
108	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
109	* @param pRange The range to write to.
110	* @param GCPhys The physical address to start writing.
111	* @param pvValue Where to store the value.
112	* @param cbValue The size of the value to write.
113	*/
114	static VBOXSTRICTRC iomMMIODoComplicatedWrite(PVM pVM, PVMCPU pVCpu, PIOMMMIORANGE pRange, RTGCPHYS GCPhys,
115	void const *pvValue, unsigned cbValue)
116	{
117	RT_NOREF_PV(pVCpu);
118	AssertReturn( (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) != IOMMMIO_FLAGS_WRITE_PASSTHRU
119	&& (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) <= IOMMMIO_FLAGS_WRITE_DWORD_QWORD_READ_MISSING,
120	VERR_IOM_MMIO_IPE_1);
121	AssertReturn(cbValue != 0 && cbValue <= 16, VERR_IOM_MMIO_IPE_2);
122	RTGCPHYS const GCPhysStart = GCPhys; NOREF(GCPhysStart);
123	bool const fReadMissing = (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_DWORD_READ_MISSING
124	\|\| (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_DWORD_QWORD_READ_MISSING;
125
126	/*
127	* Do debug stop if requested.
128	*/
129	int rc = VINF_SUCCESS; NOREF(pVM);
130	#ifdef VBOX_STRICT
131	if (pRange->fFlags & IOMMMIO_FLAGS_DBGSTOP_ON_COMPLICATED_WRITE)
132	{
133	# ifdef IN_RING3
134	LogRel(("IOM: Complicated write %#x byte at %RGp to %s, initiating debugger intervention\n", cbValue, GCPhys,
135	R3STRING(pRange->pszDesc)));
136	rc = DBGFR3EventSrc(pVM, DBGFEVENT_DEV_STOP, RT_SRC_POS,
137	"Complicated write %#x byte at %RGp to %s\n", cbValue, GCPhys, R3STRING(pRange->pszDesc));
138	if (rc == VERR_DBGF_NOT_ATTACHED)
139	rc = VINF_SUCCESS;
140	# else
141	return VINF_IOM_R3_MMIO_WRITE;
142	# endif
143	}
144	#endif
145
146	/*
147	* Check if we should ignore the write.
148	*/
149	if ((pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_ONLY_DWORD)
150	{
151	Assert(cbValue != 4 \|\| (GCPhys & 3));
152	return VINF_SUCCESS;
153	}
154	if ((pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_ONLY_DWORD_QWORD)
155	{
156	Assert((cbValue != 4 && cbValue != 8) \|\| (GCPhys & (cbValue - 1)));
157	return VINF_SUCCESS;
158	}
159
160	/*
161	* Split and conquer.
162	*/
163	for (;;)
164	{
165	unsigned const offAccess = GCPhys & 3;
166	unsigned cbThisPart = 4 - offAccess;
167	if (cbThisPart > cbValue)
168	cbThisPart = cbValue;
169
170	/*
171	* Get the missing bits (if any).
172	*/
173	uint32_t u32MissingValue = 0;
174	if (fReadMissing && cbThisPart != 4)
175	{
176	int rc2 = pRange->CTX_SUFF(pfnReadCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser),
177	GCPhys & ~(RTGCPHYS)3, &u32MissingValue, sizeof(u32MissingValue));
178	switch (rc2)
179	{
180	case VINF_SUCCESS:
181	break;
182	case VINF_IOM_MMIO_UNUSED_FF:
183	u32MissingValue = UINT32_C(0xffffffff);
184	break;
185	case VINF_IOM_MMIO_UNUSED_00:
186	u32MissingValue = 0;
187	break;
188	#ifndef IN_RING3
189	case VINF_IOM_R3_MMIO_READ:
190	case VINF_IOM_R3_MMIO_READ_WRITE:
191	case VINF_IOM_R3_MMIO_WRITE:
192	LogFlow(("iomMMIODoComplicatedWrite: GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc [read]\n", GCPhys, GCPhysStart, cbValue, rc2));
193	rc2 = VBOXSTRICTRC_TODO(iomMmioRing3WritePending(pVCpu, GCPhys, pvValue, cbValue, pRange));
194	if (rc == VINF_SUCCESS \|\| rc2 < rc)
195	rc = rc2;
196	return rc;
197	#endif
198	default:
199	if (RT_FAILURE(rc2))
200	{
201	Log(("iomMMIODoComplicatedWrite: GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc [read]\n", GCPhys, GCPhysStart, cbValue, rc2));
202	return rc2;
203	}
204	AssertMsgReturn(rc2 >= VINF_EM_FIRST && rc2 <= VINF_EM_LAST, ("%Rrc\n", rc2), VERR_IPE_UNEXPECTED_INFO_STATUS);
205	if (rc == VINF_SUCCESS \|\| rc2 < rc)
206	rc = rc2;
207	break;
208	}
209	}
210
211	/*
212	* Merge missing and given bits.
213	*/
214	uint32_t u32GivenMask;
215	uint32_t u32GivenValue;
216	switch (cbThisPart)
217	{
218	case 1:
219	u32GivenValue = (uint8_t const )pvValue;
220	u32GivenMask = UINT32_C(0x000000ff);
221	break;
222	case 2:
223	u32GivenValue = (uint16_t const )pvValue;
224	u32GivenMask = UINT32_C(0x0000ffff);
225	break;
226	case 3:
227	u32GivenValue = RT_MAKE_U32_FROM_U8(((uint8_t const )pvValue)[0], ((uint8_t const )pvValue)[1],
228	((uint8_t const *)pvValue)[2], 0);
229	u32GivenMask = UINT32_C(0x00ffffff);
230	break;
231	case 4:
232	u32GivenValue = (uint32_t const )pvValue;
233	u32GivenMask = UINT32_C(0xffffffff);
234	break;
235	default:
236	AssertFailedReturn(VERR_IOM_MMIO_IPE_3);
237	}
238	if (offAccess)
239	{
240	u32GivenValue <<= offAccess * 8;
241	u32GivenMask <<= offAccess * 8;
242	}
243
244	uint32_t u32Value = (u32MissingValue & ~u32GivenMask)
245	\| (u32GivenValue & u32GivenMask);
246
247	/*
248	* Do DWORD write to the device.
249	*/
250	int rc2 = pRange->CTX_SUFF(pfnWriteCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser),
251	GCPhys & ~(RTGCPHYS)3, &u32Value, sizeof(u32Value));
252	switch (rc2)
253	{
254	case VINF_SUCCESS:
255	break;
256	#ifndef IN_RING3
257	case VINF_IOM_R3_MMIO_READ:
258	case VINF_IOM_R3_MMIO_READ_WRITE:
259	case VINF_IOM_R3_MMIO_WRITE:
260	Log3(("iomMMIODoComplicatedWrite: deferring GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc [write]\n", GCPhys, GCPhysStart, cbValue, rc2));
261	AssertReturn(pVCpu->iom.s.PendingMmioWrite.cbValue == 0, VERR_IOM_MMIO_IPE_1);
262	AssertReturn(cbValue + (GCPhys & 3) <= sizeof(pVCpu->iom.s.PendingMmioWrite.abValue), VERR_IOM_MMIO_IPE_2);
263	pVCpu->iom.s.PendingMmioWrite.GCPhys = GCPhys & ~(RTGCPHYS)3;
264	pVCpu->iom.s.PendingMmioWrite.cbValue = cbValue + (GCPhys & 3);
265	(uint32_t )pVCpu->iom.s.PendingMmioWrite.abValue = u32Value;
266	if (cbValue > cbThisPart)
267	memcpy(&pVCpu->iom.s.PendingMmioWrite.abValue[4],
268	(uint8_t const *)pvValue + cbThisPart, cbValue - cbThisPart);
269	VMCPU_FF_SET(pVCpu, VMCPU_FF_IOM);
270	if (rc == VINF_SUCCESS)
271	rc = VINF_IOM_R3_MMIO_COMMIT_WRITE;
272	return rc2;
273	#endif
274	default:
275	if (RT_FAILURE(rc2))
276	{
277	Log(("iomMMIODoComplicatedWrite: GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc [write]\n", GCPhys, GCPhysStart, cbValue, rc2));
278	return rc2;
279	}
280	AssertMsgReturn(rc2 >= VINF_EM_FIRST && rc2 <= VINF_EM_LAST, ("%Rrc\n", rc2), VERR_IPE_UNEXPECTED_INFO_STATUS);
281	if (rc == VINF_SUCCESS \|\| rc2 < rc)
282	rc = rc2;
283	break;
284	}
285
286	/*
287	* Advance.
288	*/
289	cbValue -= cbThisPart;
290	if (!cbValue)
291	break;
292	GCPhys += cbThisPart;
293	pvValue = (uint8_t const *)pvValue + cbThisPart;
294	}
295
296	return rc;
297	}
298
299
300
301
302	/**
303	* Wrapper which does the write and updates range statistics when such are enabled.
304	* @warning RT_SUCCESS(rc=VINF_IOM_R3_MMIO_WRITE) is TRUE!
305	*/
306	static VBOXSTRICTRC iomMMIODoWrite(PVM pVM, PVMCPU pVCpu, PIOMMMIORANGE pRange, RTGCPHYS GCPhysFault,
307	const void *pvData, unsigned cb)
308	{
309	#ifdef VBOX_WITH_STATISTICS
310	int rcSem = IOM_LOCK_SHARED(pVM);
311	if (rcSem == VERR_SEM_BUSY)
312	return VINF_IOM_R3_MMIO_WRITE;
313	PIOMMMIOSTATS pStats = iomMmioGetStats(pVM, pVCpu, GCPhysFault, pRange);
314	if (!pStats)
315	# ifdef IN_RING3
316	return VERR_NO_MEMORY;
317	# else
318	return VINF_IOM_R3_MMIO_WRITE;
319	# endif
320	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfWrite), a);
321	#else
322	NOREF(pVCpu);
323	#endif
324
325	VBOXSTRICTRC rcStrict;
326	if (RT_LIKELY(pRange->CTX_SUFF(pfnWriteCallback)))
327	{
328	if ( (cb == 4 && !(GCPhysFault & 3))
329	\|\| (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_PASSTHRU
330	\|\| (cb == 8 && !(GCPhysFault & 7) && IOMMMIO_DOES_WRITE_MODE_ALLOW_QWORD(pRange->fFlags)) )
331	rcStrict = pRange->CTX_SUFF(pfnWriteCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser),
332	GCPhysFault, (void )pvData, cb); /* @todo fix const!! */
333	else
334	rcStrict = iomMMIODoComplicatedWrite(pVM, pVCpu, pRange, GCPhysFault, pvData, cb);
335	}
336	else
337	rcStrict = VINF_SUCCESS;
338
339	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfWrite), a);
340	STAM_COUNTER_INC(&pStats->Accesses);
341	return rcStrict;
342	}
343
344
345	/**
346	* Deals with complicated MMIO reads.
347	*
348	* Complicated means unaligned or non-dword/qword sized accesses depending on
349	* the MMIO region's access mode flags.
350	*
351	* @returns Strict VBox status code. Any EM scheduling status code,
352	* VINF_IOM_R3_MMIO_READ, VINF_IOM_R3_MMIO_READ_WRITE or
353	* VINF_IOM_R3_MMIO_WRITE may be returned.
354	*
355	* @param pVM The cross context VM structure.
356	* @param pRange The range to read from.
357	* @param GCPhys The physical address to start reading.
358	* @param pvValue Where to store the value.
359	* @param cbValue The size of the value to read.
360	*/
361	static VBOXSTRICTRC iomMMIODoComplicatedRead(PVM pVM, PIOMMMIORANGE pRange, RTGCPHYS GCPhys, void *pvValue, unsigned cbValue)
362	{
363	AssertReturn( (pRange->fFlags & IOMMMIO_FLAGS_READ_MODE) == IOMMMIO_FLAGS_READ_DWORD
364	\|\| (pRange->fFlags & IOMMMIO_FLAGS_READ_MODE) == IOMMMIO_FLAGS_READ_DWORD_QWORD,
365	VERR_IOM_MMIO_IPE_1);
366	AssertReturn(cbValue != 0 && cbValue <= 16, VERR_IOM_MMIO_IPE_2);
367	RTGCPHYS const GCPhysStart = GCPhys; NOREF(GCPhysStart);
368
369	/*
370	* Do debug stop if requested.
371	*/
372	int rc = VINF_SUCCESS; NOREF(pVM);
373	#ifdef VBOX_STRICT
374	if (pRange->fFlags & IOMMMIO_FLAGS_DBGSTOP_ON_COMPLICATED_READ)
375	{
376	# ifdef IN_RING3
377	rc = DBGFR3EventSrc(pVM, DBGFEVENT_DEV_STOP, RT_SRC_POS,
378	"Complicated read %#x byte at %RGp to %s\n", cbValue, GCPhys, R3STRING(pRange->pszDesc));
379	if (rc == VERR_DBGF_NOT_ATTACHED)
380	rc = VINF_SUCCESS;
381	# else
382	return VINF_IOM_R3_MMIO_READ;
383	# endif
384	}
385	#endif
386
387	/*
388	* Split and conquer.
389	*/
390	for (;;)
391	{
392	/*
393	* Do DWORD read from the device.
394	*/
395	uint32_t u32Value;
396	int rc2 = pRange->CTX_SUFF(pfnReadCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser),
397	GCPhys & ~(RTGCPHYS)3, &u32Value, sizeof(u32Value));
398	switch (rc2)
399	{
400	case VINF_SUCCESS:
401	break;
402	case VINF_IOM_MMIO_UNUSED_FF:
403	u32Value = UINT32_C(0xffffffff);
404	break;
405	case VINF_IOM_MMIO_UNUSED_00:
406	u32Value = 0;
407	break;
408	case VINF_IOM_R3_MMIO_READ:
409	case VINF_IOM_R3_MMIO_READ_WRITE:
410	case VINF_IOM_R3_MMIO_WRITE:
411	/** @todo What if we've split a transfer and already read
412	* something? Since reads can have sideeffects we could be
413	* kind of screwed here... */
414	LogFlow(("iomMMIODoComplicatedRead: GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc\n", GCPhys, GCPhysStart, cbValue, rc2));
415	return rc2;
416	default:
417	if (RT_FAILURE(rc2))
418	{
419	Log(("iomMMIODoComplicatedRead: GCPhys=%RGp GCPhysStart=%RGp cbValue=%u rc=%Rrc\n", GCPhys, GCPhysStart, cbValue, rc2));
420	return rc2;
421	}
422	AssertMsgReturn(rc2 >= VINF_EM_FIRST && rc2 <= VINF_EM_LAST, ("%Rrc\n", rc2), VERR_IPE_UNEXPECTED_INFO_STATUS);
423	if (rc == VINF_SUCCESS \|\| rc2 < rc)
424	rc = rc2;
425	break;
426	}
427	u32Value >>= (GCPhys & 3) * 8;
428
429	/*
430	* Write what we've read.
431	*/
432	unsigned cbThisPart = 4 - (GCPhys & 3);
433	if (cbThisPart > cbValue)
434	cbThisPart = cbValue;
435
436	switch (cbThisPart)
437	{
438	case 1:
439	(uint8_t )pvValue = (uint8_t)u32Value;
440	break;
441	case 2:
442	(uint16_t )pvValue = (uint16_t)u32Value;
443	break;
444	case 3:
445	((uint8_t *)pvValue)[0] = RT_BYTE1(u32Value);
446	((uint8_t *)pvValue)[1] = RT_BYTE2(u32Value);
447	((uint8_t *)pvValue)[2] = RT_BYTE3(u32Value);
448	break;
449	case 4:
450	(uint32_t )pvValue = u32Value;
451	break;
452	}
453
454	/*
455	* Advance.
456	*/
457	cbValue -= cbThisPart;
458	if (!cbValue)
459	break;
460	GCPhys += cbThisPart;
461	pvValue = (uint8_t *)pvValue + cbThisPart;
462	}
463
464	return rc;
465	}
466
467
468	/**
469	* Implements VINF_IOM_MMIO_UNUSED_FF.
470	*
471	* @returns VINF_SUCCESS.
472	* @param pvValue Where to store the zeros.
473	* @param cbValue How many bytes to read.
474	*/
475	static int iomMMIODoReadFFs(void *pvValue, size_t cbValue)
476	{
477	switch (cbValue)
478	{
479	case 1: (uint8_t )pvValue = UINT8_C(0xff); break;
480	case 2: (uint16_t )pvValue = UINT16_C(0xffff); break;
481	case 4: (uint32_t )pvValue = UINT32_C(0xffffffff); break;
482	case 8: (uint64_t )pvValue = UINT64_C(0xffffffffffffffff); break;
483	default:
484	{
485	uint8_t pb = (uint8_t )pvValue;
486	while (cbValue--)
487	*pb++ = UINT8_C(0xff);
488	break;
489	}
490	}
491	return VINF_SUCCESS;
492	}
493
494
495	/**
496	* Implements VINF_IOM_MMIO_UNUSED_00.
497	*
498	* @returns VINF_SUCCESS.
499	* @param pvValue Where to store the zeros.
500	* @param cbValue How many bytes to read.
501	*/
502	static int iomMMIODoRead00s(void *pvValue, size_t cbValue)
503	{
504	switch (cbValue)
505	{
506	case 1: (uint8_t )pvValue = UINT8_C(0x00); break;
507	case 2: (uint16_t )pvValue = UINT16_C(0x0000); break;
508	case 4: (uint32_t )pvValue = UINT32_C(0x00000000); break;
509	case 8: (uint64_t )pvValue = UINT64_C(0x0000000000000000); break;
510	default:
511	{
512	uint8_t pb = (uint8_t )pvValue;
513	while (cbValue--)
514	*pb++ = UINT8_C(0x00);
515	break;
516	}
517	}
518	return VINF_SUCCESS;
519	}
520
521
522	/**
523	* Wrapper which does the read and updates range statistics when such are enabled.
524	*/
525	DECLINLINE(VBOXSTRICTRC) iomMMIODoRead(PVM pVM, PVMCPU pVCpu, PIOMMMIORANGE pRange, RTGCPHYS GCPhys,
526	void *pvValue, unsigned cbValue)
527	{
528	#ifdef VBOX_WITH_STATISTICS
529	int rcSem = IOM_LOCK_SHARED(pVM);
530	if (rcSem == VERR_SEM_BUSY)
531	return VINF_IOM_R3_MMIO_READ;
532	PIOMMMIOSTATS pStats = iomMmioGetStats(pVM, pVCpu, GCPhys, pRange);
533	if (!pStats)
534	# ifdef IN_RING3
535	return VERR_NO_MEMORY;
536	# else
537	return VINF_IOM_R3_MMIO_READ;
538	# endif
539	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfRead), a);
540	#else
541	NOREF(pVCpu);
542	#endif
543
544	VBOXSTRICTRC rcStrict;
545	if (RT_LIKELY(pRange->CTX_SUFF(pfnReadCallback)))
546	{
547	if ( ( cbValue == 4
548	&& !(GCPhys & 3))
549	\|\| (pRange->fFlags & IOMMMIO_FLAGS_READ_MODE) == IOMMMIO_FLAGS_READ_PASSTHRU
550	\|\| ( cbValue == 8
551	&& !(GCPhys & 7)
552	&& (pRange->fFlags & IOMMMIO_FLAGS_READ_MODE) == IOMMMIO_FLAGS_READ_DWORD_QWORD ) )
553	rcStrict = pRange->CTX_SUFF(pfnReadCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser), GCPhys,
554	pvValue, cbValue);
555	else
556	rcStrict = iomMMIODoComplicatedRead(pVM, pRange, GCPhys, pvValue, cbValue);
557	}
558	else
559	rcStrict = VINF_IOM_MMIO_UNUSED_FF;
560	if (rcStrict != VINF_SUCCESS)
561	{
562	switch (VBOXSTRICTRC_VAL(rcStrict))
563	{
564	case VINF_IOM_MMIO_UNUSED_FF: rcStrict = iomMMIODoReadFFs(pvValue, cbValue); break;
565	case VINF_IOM_MMIO_UNUSED_00: rcStrict = iomMMIODoRead00s(pvValue, cbValue); break;
566	}
567	}
568
569	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfRead), a);
570	STAM_COUNTER_INC(&pStats->Accesses);
571	return rcStrict;
572	}
573
574	/**
575	* Common worker for the \#PF handler and IOMMMIOPhysHandler (APIC+VT-x).
576	*
577	* @returns VBox status code (appropriate for GC return).
578	* @param pVM The cross context VM structure.
579	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
580	* @param uErrorCode CPU Error code. This is UINT32_MAX when we don't have
581	* any error code (the EPT misconfig hack).
582	* @param pCtxCore Trap register frame.
583	* @param GCPhysFault The GC physical address corresponding to pvFault.
584	* @param pvUser Pointer to the MMIO ring-3 range entry.
585	*/
586	static VBOXSTRICTRC iomMmioCommonPfHandler(PVM pVM, PVMCPU pVCpu, uint32_t uErrorCode, PCPUMCTXCORE pCtxCore,
587	RTGCPHYS GCPhysFault, void *pvUser)
588	{
589	RT_NOREF_PV(uErrorCode);
590	int rc = IOM_LOCK_SHARED(pVM);
591	#ifndef IN_RING3
592	if (rc == VERR_SEM_BUSY)
593	return VINF_IOM_R3_MMIO_READ_WRITE;
594	#endif
595	AssertRC(rc);
596
597	STAM_PROFILE_START(&pVM->iom.s.StatRZMMIOHandler, a);
598	Log(("iomMmioCommonPfHandler: GCPhys=%RGp uErr=%#x rip=%RGv\n", GCPhysFault, uErrorCode, (RTGCPTR)pCtxCore->rip));
599
600	PIOMMMIORANGE pRange = (PIOMMMIORANGE)pvUser;
601	Assert(pRange);
602	Assert(pRange == iomMmioGetRange(pVM, pVCpu, GCPhysFault));
603	iomMmioRetainRange(pRange);
604	#ifndef VBOX_WITH_STATISTICS
605	IOM_UNLOCK_SHARED(pVM);
606
607	#else
608	/*
609	* Locate the statistics.
610	*/
611	PIOMMMIOSTATS pStats = iomMmioGetStats(pVM, pVCpu, GCPhysFault, pRange);
612	if (!pStats)
613	{
614	iomMmioReleaseRange(pVM, pRange);
615	# ifdef IN_RING3
616	return VERR_NO_MEMORY;
617	# else
618	STAM_PROFILE_STOP(&pVM->iom.s.StatRZMMIOHandler, a);
619	STAM_COUNTER_INC(&pVM->iom.s.StatRZMMIOFailures);
620	return VINF_IOM_R3_MMIO_READ_WRITE;
621	# endif
622	}
623	#endif
624
625	#ifndef IN_RING3
626	/*
627	* Should we defer the request right away? This isn't usually the case, so
628	* do the simple test first and the try deal with uErrorCode being N/A.
629	*/
630	if (RT_UNLIKELY( ( !pRange->CTX_SUFF(pfnWriteCallback)
631	\|\| !pRange->CTX_SUFF(pfnReadCallback))
632	&& ( uErrorCode == UINT32_MAX
633	? pRange->pfnWriteCallbackR3 \|\| pRange->pfnReadCallbackR3
634	: uErrorCode & X86_TRAP_PF_RW
635	? !pRange->CTX_SUFF(pfnWriteCallback) && pRange->pfnWriteCallbackR3
636	: !pRange->CTX_SUFF(pfnReadCallback) && pRange->pfnReadCallbackR3
637	)
638	)
639	)
640	{
641	if (uErrorCode & X86_TRAP_PF_RW)
642	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Write,ToR3));
643	else
644	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Read,ToR3));
645
646	STAM_PROFILE_STOP(&pVM->iom.s.StatRZMMIOHandler, a);
647	STAM_COUNTER_INC(&pVM->iom.s.StatRZMMIOFailures);
648	iomMmioReleaseRange(pVM, pRange);
649	return VINF_IOM_R3_MMIO_READ_WRITE;
650	}
651	#endif /* !IN_RING3 */
652
653	/*
654	* Retain the range and do locking.
655	*/
656	PPDMDEVINS pDevIns = pRange->CTX_SUFF(pDevIns);
657	rc = PDMCritSectEnter(pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_MMIO_READ_WRITE);
658	if (rc != VINF_SUCCESS)
659	{
660	iomMmioReleaseRange(pVM, pRange);
661	return rc;
662	}
663
664	/*
665	* Let IEM call us back via iomMmioHandler.
666	*/
667	VBOXSTRICTRC rcStrict = IEMExecOne(pVCpu);
668
669	NOREF(pCtxCore); NOREF(GCPhysFault);
670	STAM_PROFILE_STOP(&pVM->iom.s.StatRZMMIOHandler, a);
671	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
672	iomMmioReleaseRange(pVM, pRange);
673	if (RT_SUCCESS(rcStrict))
674	return rcStrict;
675	if ( rcStrict == VERR_IEM_ASPECT_NOT_IMPLEMENTED
676	\|\| rcStrict == VERR_IEM_INSTR_NOT_IMPLEMENTED)
677	{
678	Log(("IOM: Hit unsupported IEM feature!\n"));
679	rcStrict = VINF_EM_RAW_EMULATE_INSTR;
680	}
681	return rcStrict;
682	}
683
684
685	/**
686	* @callback_method_impl{FNPGMRZPHYSPFHANDLER,
687	* \#PF access handler callback for MMIO pages.}
688	*
689	* @remarks The @a pvUser argument points to the IOMMMIORANGE.
690	*/
691	DECLEXPORT(VBOXSTRICTRC) iomMmioPfHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pCtxCore, RTGCPTR pvFault,
692	RTGCPHYS GCPhysFault, void *pvUser)
693	{
694	LogFlow(("iomMmioPfHandler: GCPhys=%RGp uErr=%#x pvFault=%RGv rip=%RGv\n",
695	GCPhysFault, (uint32_t)uErrorCode, pvFault, (RTGCPTR)pCtxCore->rip)); NOREF(pvFault);
696	return iomMmioCommonPfHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pvUser);
697	}
698
699
700	/**
701	* Physical access handler for MMIO ranges.
702	*
703	* @returns VBox status code (appropriate for GC return).
704	* @param pVM The cross context VM structure.
705	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
706	* @param uErrorCode CPU Error code.
707	* @param pCtxCore Trap register frame.
708	* @param GCPhysFault The GC physical address.
709	*/
710	VMMDECL(VBOXSTRICTRC) IOMMMIOPhysHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pCtxCore, RTGCPHYS GCPhysFault)
711	{
712	/*
713	* We don't have a range here, so look it up before calling the common function.
714	*/
715	int rc2 = IOM_LOCK_SHARED(pVM); NOREF(rc2);
716	#ifndef IN_RING3
717	if (rc2 == VERR_SEM_BUSY)
718	return VINF_IOM_R3_MMIO_READ_WRITE;
719	#endif
720	PIOMMMIORANGE pRange = iomMmioGetRange(pVM, pVCpu, GCPhysFault);
721	if (RT_UNLIKELY(!pRange))
722	{
723	IOM_UNLOCK_SHARED(pVM);
724	return VERR_IOM_MMIO_RANGE_NOT_FOUND;
725	}
726	iomMmioRetainRange(pRange);
727	IOM_UNLOCK_SHARED(pVM);
728
729	VBOXSTRICTRC rcStrict = iomMmioCommonPfHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pRange);
730
731	iomMmioReleaseRange(pVM, pRange);
732	return VBOXSTRICTRC_VAL(rcStrict);
733	}
734
735
736	/**
737	* @callback_method_impl{FNPGMPHYSHANDLER, MMIO page accesses}
738	*
739	* @remarks The @a pvUser argument points to the MMIO range entry.
740	*/
741	PGM_ALL_CB2_DECL(VBOXSTRICTRC) iomMmioHandler(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhysFault, void pvPhys, void pvBuf,
742	size_t cbBuf, PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, void *pvUser)
743	{
744	PIOMMMIORANGE pRange = (PIOMMMIORANGE)pvUser;
745	STAM_COUNTER_INC(&pVM->iom.s.StatR3MMIOHandler);
746
747	NOREF(pvPhys); NOREF(enmOrigin);
748	AssertPtr(pRange);
749	AssertMsg(cbBuf >= 1, ("%zu\n", cbBuf));
750
751
752	#ifndef IN_RING3
753	/*
754	* If someone is doing FXSAVE, FXRSTOR, XSAVE, XRSTOR or other stuff dealing with
755	* large amounts of data, just go to ring-3 where we don't need to deal with partial
756	* successes. No chance any of these will be problematic read-modify-write stuff.
757	*/
758	if (cbBuf > sizeof(pVCpu->iom.s.PendingMmioWrite.abValue))
759	return enmAccessType == PGMACCESSTYPE_WRITE ? VINF_IOM_R3_MMIO_WRITE : VINF_IOM_R3_MMIO_READ;
760	#endif
761
762	/*
763	* Validate the range.
764	*/
765	int rc = IOM_LOCK_SHARED(pVM);
766	#ifndef IN_RING3
767	if (rc == VERR_SEM_BUSY)
768	{
769	if (enmAccessType == PGMACCESSTYPE_READ)
770	return VINF_IOM_R3_MMIO_READ;
771	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
772	return iomMmioRing3WritePending(pVCpu, GCPhysFault, pvBuf, cbBuf, NULL /pRange/);
773	}
774	#endif
775	AssertRC(rc);
776	Assert(pRange == iomMmioGetRange(pVM, pVCpu, GCPhysFault));
777
778	/*
779	* Perform locking.
780	*/
781	iomMmioRetainRange(pRange);
782	PPDMDEVINS pDevIns = pRange->CTX_SUFF(pDevIns);
783	IOM_UNLOCK_SHARED(pVM);
784	#ifdef IN_RING3
785	VBOXSTRICTRC rcStrict = PDMCritSectEnter(pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_MMIO_READ_WRITE);
786	#else
787	VBOXSTRICTRC rcStrict = pDevIns ? PDMCritSectEnter(pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_MMIO_READ_WRITE)
788	: VINF_IOM_R3_MMIO_READ_WRITE;
789	#endif
790	if (rcStrict == VINF_SUCCESS)
791	{
792	/*
793	* Perform the access.
794	*/
795	if (enmAccessType == PGMACCESSTYPE_READ)
796	rcStrict = iomMMIODoRead(pVM, pVCpu, pRange, GCPhysFault, pvBuf, (unsigned)cbBuf);
797	else
798	{
799	rcStrict = iomMMIODoWrite(pVM, pVCpu, pRange, GCPhysFault, pvBuf, (unsigned)cbBuf);
800	#ifndef IN_RING3
801	if (rcStrict == VINF_IOM_R3_MMIO_WRITE)
802	rcStrict = iomMmioRing3WritePending(pVCpu, GCPhysFault, pvBuf, cbBuf, pRange);
803	#endif
804	}
805
806	/* Check the return code. */
807	#ifdef IN_RING3
808	AssertMsg(rcStrict == VINF_SUCCESS, ("%Rrc - %RGp - %s\n", VBOXSTRICTRC_VAL(rcStrict), GCPhysFault, pRange->pszDesc));
809	#else
810	AssertMsg( rcStrict == VINF_SUCCESS
811	\|\| rcStrict == (enmAccessType == PGMACCESSTYPE_READ ? VINF_IOM_R3_MMIO_READ : VINF_IOM_R3_MMIO_WRITE)
812	\|\| (rcStrict == VINF_IOM_R3_MMIO_COMMIT_WRITE && enmAccessType == PGMACCESSTYPE_WRITE)
813	\|\| rcStrict == VINF_IOM_R3_MMIO_READ_WRITE
814	\|\| rcStrict == VINF_EM_DBG_STOP
815	\|\| rcStrict == VINF_EM_DBG_EVENT
816	\|\| rcStrict == VINF_EM_DBG_BREAKPOINT
817	\|\| rcStrict == VINF_EM_OFF
818	\|\| rcStrict == VINF_EM_SUSPEND
819	\|\| rcStrict == VINF_EM_RESET
820	\|\| rcStrict == VINF_EM_RAW_EMULATE_IO_BLOCK
821	//\|\| rcStrict == VINF_EM_HALT /* ?? */
822	//\|\| rcStrict == VINF_EM_NO_MEMORY /* ?? */
823	, ("%Rrc - %RGp - %p\n", VBOXSTRICTRC_VAL(rcStrict), GCPhysFault, pDevIns));
824	#endif
825
826	iomMmioReleaseRange(pVM, pRange);
827	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
828	}
829	#ifdef IN_RING3
830	else
831	iomMmioReleaseRange(pVM, pRange);
832	#else
833	else
834	{
835	if (rcStrict == VINF_IOM_R3_MMIO_READ_WRITE)
836	{
837	if (enmAccessType == PGMACCESSTYPE_READ)
838	rcStrict = VINF_IOM_R3_MMIO_READ;
839	else
840	{
841	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
842	rcStrict = iomMmioRing3WritePending(pVCpu, GCPhysFault, pvBuf, cbBuf, pRange);
843	}
844	}
845	iomMmioReleaseRange(pVM, pRange);
846	}
847	#endif
848	return rcStrict;
849	}
850
851
852	#ifdef IN_RING3 /* Only used by REM. */
853
854	/**
855	* Reads a MMIO register.
856	*
857	* @returns VBox status code.
858	*
859	* @param pVM The cross context VM structure.
860	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
861	* @param GCPhys The physical address to read.
862	* @param pu32Value Where to store the value read.
863	* @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes.
864	*/
865	VMMDECL(VBOXSTRICTRC) IOMMMIORead(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, uint32_t *pu32Value, size_t cbValue)
866	{
867	Assert(pVCpu->iom.s.PendingMmioWrite.cbValue == 0);
868	/* Take the IOM lock before performing any MMIO. */
869	VBOXSTRICTRC rc = IOM_LOCK_SHARED(pVM);
870	#ifndef IN_RING3
871	if (rc == VERR_SEM_BUSY)
872	return VINF_IOM_R3_MMIO_WRITE;
873	#endif
874	AssertRC(VBOXSTRICTRC_VAL(rc));
875
876	/*
877	* Lookup the current context range node and statistics.
878	*/
879	PIOMMMIORANGE pRange = iomMmioGetRange(pVM, pVCpu, GCPhys);
880	if (!pRange)
881	{
882	AssertMsgFailed(("Handlers and page tables are out of sync or something! GCPhys=%RGp cbValue=%d\n", GCPhys, cbValue));
883	IOM_UNLOCK_SHARED(pVM);
884	return VERR_IOM_MMIO_RANGE_NOT_FOUND;
885	}
886	iomMmioRetainRange(pRange);
887	#ifndef VBOX_WITH_STATISTICS
888	IOM_UNLOCK_SHARED(pVM);
889
890	#else /* VBOX_WITH_STATISTICS */
891	PIOMMMIOSTATS pStats = iomMmioGetStats(pVM, pVCpu, GCPhys, pRange);
892	if (!pStats)
893	{
894	iomMmioReleaseRange(pVM, pRange);
895	# ifdef IN_RING3
896	return VERR_NO_MEMORY;
897	# else
898	return VINF_IOM_R3_MMIO_READ;
899	# endif
900	}
901	STAM_COUNTER_INC(&pStats->Accesses);
902	#endif /* VBOX_WITH_STATISTICS */
903
904	if (pRange->CTX_SUFF(pfnReadCallback))
905	{
906	/*
907	* Perform locking.
908	*/
909	PPDMDEVINS pDevIns = pRange->CTX_SUFF(pDevIns);
910	rc = PDMCritSectEnter(pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_MMIO_WRITE);
911	if (rc != VINF_SUCCESS)
912	{
913	iomMmioReleaseRange(pVM, pRange);
914	return rc;
915	}
916
917	/*
918	* Perform the read and deal with the result.
919	*/
920	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfRead), a);
921	if ( (cbValue == 4 && !(GCPhys & 3))
922	\|\| (pRange->fFlags & IOMMMIO_FLAGS_READ_MODE) == IOMMMIO_FLAGS_READ_PASSTHRU
923	\|\| (cbValue == 8 && !(GCPhys & 7)) )
924	rc = pRange->CTX_SUFF(pfnReadCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser), GCPhys,
925	pu32Value, (unsigned)cbValue);
926	else
927	rc = iomMMIODoComplicatedRead(pVM, pRange, GCPhys, pu32Value, (unsigned)cbValue);
928	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfRead), a);
929	switch (VBOXSTRICTRC_VAL(rc))
930	{
931	case VINF_SUCCESS:
932	Log4(("IOMMMIORead: GCPhys=%RGp pu32=%08RX32 cb=%d rc=VINF_SUCCESS\n", GCPhys, pu32Value, cbValue));
933	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
934	iomMmioReleaseRange(pVM, pRange);
935	return rc;
936	#ifndef IN_RING3
937	case VINF_IOM_R3_MMIO_READ:
938	case VINF_IOM_R3_MMIO_READ_WRITE:
939	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Read,ToR3));
940	#endif
941	default:
942	Log4(("IOMMMIORead: GCPhys=%RGp pu32=%08RX32 cb=%d rc=%Rrc\n", GCPhys, pu32Value, cbValue, VBOXSTRICTRC_VAL(rc)));
943	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
944	iomMmioReleaseRange(pVM, pRange);
945	return rc;
946
947	case VINF_IOM_MMIO_UNUSED_00:
948	iomMMIODoRead00s(pu32Value, cbValue);
949	Log4(("IOMMMIORead: GCPhys=%RGp pu32=%08RX32 cb=%d rc=%Rrc\n", GCPhys, pu32Value, cbValue, VBOXSTRICTRC_VAL(rc)));
950	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
951	iomMmioReleaseRange(pVM, pRange);
952	return VINF_SUCCESS;
953
954	case VINF_IOM_MMIO_UNUSED_FF:
955	iomMMIODoReadFFs(pu32Value, cbValue);
956	Log4(("IOMMMIORead: GCPhys=%RGp pu32=%08RX32 cb=%d rc=%Rrc\n", GCPhys, pu32Value, cbValue, VBOXSTRICTRC_VAL(rc)));
957	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
958	iomMmioReleaseRange(pVM, pRange);
959	return VINF_SUCCESS;
960	}
961	/* not reached */
962	}
963	#ifndef IN_RING3
964	if (pRange->pfnReadCallbackR3)
965	{
966	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Read,ToR3));
967	iomMmioReleaseRange(pVM, pRange);
968	return VINF_IOM_R3_MMIO_READ;
969	}
970	#endif
971
972	/*
973	* Unassigned memory - this is actually not supposed t happen...
974	*/
975	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfRead), a); /** @todo STAM_PROFILE_ADD_ZERO_PERIOD */
976	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfRead), a);
977	iomMMIODoReadFFs(pu32Value, cbValue);
978	Log4(("IOMMMIORead: GCPhys=%RGp pu32=%08RX32 cb=%d rc=VINF_SUCCESS\n", GCPhys, pu32Value, cbValue));
979	iomMmioReleaseRange(pVM, pRange);
980	return VINF_SUCCESS;
981	}
982
983
984	/**
985	* Writes to a MMIO register.
986	*
987	* @returns VBox status code.
988	*
989	* @param pVM The cross context VM structure.
990	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
991	* @param GCPhys The physical address to write to.
992	* @param u32Value The value to write.
993	* @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes.
994	*/
995	VMMDECL(VBOXSTRICTRC) IOMMMIOWrite(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, uint32_t u32Value, size_t cbValue)
996	{
997	Assert(pVCpu->iom.s.PendingMmioWrite.cbValue == 0);
998	/* Take the IOM lock before performing any MMIO. */
999	VBOXSTRICTRC rc = IOM_LOCK_SHARED(pVM);
1000	#ifndef IN_RING3
1001	if (rc == VERR_SEM_BUSY)
1002	return VINF_IOM_R3_MMIO_WRITE;
1003	#endif
1004	AssertRC(VBOXSTRICTRC_VAL(rc));
1005
1006	/*
1007	* Lookup the current context range node.
1008	*/
1009	PIOMMMIORANGE pRange = iomMmioGetRange(pVM, pVCpu, GCPhys);
1010	if (!pRange)
1011	{
1012	AssertMsgFailed(("Handlers and page tables are out of sync or something! GCPhys=%RGp cbValue=%d\n", GCPhys, cbValue));
1013	IOM_UNLOCK_SHARED(pVM);
1014	return VERR_IOM_MMIO_RANGE_NOT_FOUND;
1015	}
1016	iomMmioRetainRange(pRange);
1017	#ifndef VBOX_WITH_STATISTICS
1018	IOM_UNLOCK_SHARED(pVM);
1019
1020	#else /* VBOX_WITH_STATISTICS */
1021	PIOMMMIOSTATS pStats = iomMmioGetStats(pVM, pVCpu, GCPhys, pRange);
1022	if (!pStats)
1023	{
1024	iomMmioReleaseRange(pVM, pRange);
1025	# ifdef IN_RING3
1026	return VERR_NO_MEMORY;
1027	# else
1028	return VINF_IOM_R3_MMIO_WRITE;
1029	# endif
1030	}
1031	STAM_COUNTER_INC(&pStats->Accesses);
1032	#endif /* VBOX_WITH_STATISTICS */
1033
1034	if (pRange->CTX_SUFF(pfnWriteCallback))
1035	{
1036	/*
1037	* Perform locking.
1038	*/
1039	PPDMDEVINS pDevIns = pRange->CTX_SUFF(pDevIns);
1040	rc = PDMCritSectEnter(pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_MMIO_READ);
1041	if (rc != VINF_SUCCESS)
1042	{
1043	iomMmioReleaseRange(pVM, pRange);
1044	return rc;
1045	}
1046
1047	/*
1048	* Perform the write.
1049	*/
1050	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfWrite), a);
1051	if ( (cbValue == 4 && !(GCPhys & 3))
1052	\|\| (pRange->fFlags & IOMMMIO_FLAGS_WRITE_MODE) == IOMMMIO_FLAGS_WRITE_PASSTHRU
1053	\|\| (cbValue == 8 && !(GCPhys & 7)) )
1054	rc = pRange->CTX_SUFF(pfnWriteCallback)(pRange->CTX_SUFF(pDevIns), pRange->CTX_SUFF(pvUser),
1055	GCPhys, &u32Value, (unsigned)cbValue);
1056	else
1057	rc = iomMMIODoComplicatedWrite(pVM, pVCpu, pRange, GCPhys, &u32Value, (unsigned)cbValue);
1058	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfWrite), a);
1059	#ifndef IN_RING3
1060	if ( rc == VINF_IOM_R3_MMIO_WRITE
1061	\|\| rc == VINF_IOM_R3_MMIO_READ_WRITE)
1062	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Write,ToR3));
1063	#endif
1064	Log4(("IOMMMIOWrite: GCPhys=%RGp u32=%08RX32 cb=%d rc=%Rrc\n", GCPhys, u32Value, cbValue, VBOXSTRICTRC_VAL(rc)));
1065	iomMmioReleaseRange(pVM, pRange);
1066	PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
1067	return rc;
1068	}
1069	#ifndef IN_RING3
1070	if (pRange->pfnWriteCallbackR3)
1071	{
1072	STAM_COUNTER_INC(&pStats->CTX_MID_Z(Write,ToR3));
1073	iomMmioReleaseRange(pVM, pRange);
1074	return VINF_IOM_R3_MMIO_WRITE;
1075	}
1076	#endif
1077
1078	/*
1079	* No write handler, nothing to do.
1080	*/
1081	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfWrite), a);
1082	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfWrite), a);
1083	Log4(("IOMMMIOWrite: GCPhys=%RGp u32=%08RX32 cb=%d rc=%Rrc\n", GCPhys, u32Value, cbValue, VINF_SUCCESS));
1084	iomMmioReleaseRange(pVM, pRange);
1085	return VINF_SUCCESS;
1086	}
1087
1088	#endif /* IN_RING3 - only used by REM. */
1089	#ifndef IN_RC
1090
1091	/**
1092	* Mapping an MMIO2 page in place of an MMIO page for direct access.
1093	*
1094	* (This is a special optimization used by the VGA device.)
1095	*
1096	* @returns VBox status code. This API may return VINF_SUCCESS even if no
1097	* remapping is made,.
1098	*
1099	* @param pVM The cross context VM structure.
1100	* @param GCPhys The address of the MMIO page to be changed.
1101	* @param GCPhysRemapped The address of the MMIO2 page.
1102	* @param fPageFlags Page flags to set. Must be (X86_PTE_RW \| X86_PTE_P)
1103	* for the time being.
1104	*/
1105	VMMDECL(int) IOMMMIOMapMMIO2Page(PVM pVM, RTGCPHYS GCPhys, RTGCPHYS GCPhysRemapped, uint64_t fPageFlags)
1106	{
1107	/* Currently only called from the VGA device during MMIO. */
1108	Log(("IOMMMIOMapMMIO2Page %RGp -> %RGp flags=%RX64\n", GCPhys, GCPhysRemapped, fPageFlags));
1109	AssertReturn(fPageFlags == (X86_PTE_RW \| X86_PTE_P), VERR_INVALID_PARAMETER);
1110	PVMCPU pVCpu = VMMGetCpu(pVM);
1111
1112	/* This currently only works in real mode, protected mode without paging or with nested paging. */
1113	/** @todo NEM: MMIO page aliasing. */
1114	if ( !HMIsEnabled(pVM) /* useless without VT-x/AMD-V */
1115	\|\| ( CPUMIsGuestInPagedProtectedMode(pVCpu)
1116	&& !HMIsNestedPagingActive(pVM)))
1117	return VINF_SUCCESS; /* ignore */
1118
1119	int rc = IOM_LOCK_SHARED(pVM);
1120	if (RT_FAILURE(rc))
1121	return VINF_SUCCESS; /* better luck the next time around */
1122
1123	/*
1124	* Lookup the context range node the page belongs to.
1125	*/
1126	PIOMMMIORANGE pRange = iomMmioGetRange(pVM, pVCpu, GCPhys);
1127	AssertMsgReturn(pRange,
1128	("Handlers and page tables are out of sync or something! GCPhys=%RGp\n", GCPhys), VERR_IOM_MMIO_RANGE_NOT_FOUND);
1129
1130	Assert((pRange->GCPhys & PAGE_OFFSET_MASK) == 0);
1131	Assert((pRange->Core.KeyLast & PAGE_OFFSET_MASK) == PAGE_OFFSET_MASK);
1132
1133	/*
1134	* Do the aliasing; page align the addresses since PGM is picky.
1135	*/
1136	GCPhys &= ~(RTGCPHYS)PAGE_OFFSET_MASK;
1137	GCPhysRemapped &= ~(RTGCPHYS)PAGE_OFFSET_MASK;
1138
1139	rc = PGMHandlerPhysicalPageAlias(pVM, pRange->GCPhys, GCPhys, GCPhysRemapped);
1140
1141	IOM_UNLOCK_SHARED(pVM);
1142	AssertRCReturn(rc, rc);
1143
1144	/*
1145	* Modify the shadow page table. Since it's an MMIO page it won't be present and we
1146	* can simply prefetch it.
1147	*
1148	* Note: This is a NOP in the EPT case; we'll just let it fault again to resync the page.
1149	*/
1150	# if 0 /* The assertion is wrong for the PGM_SYNC_CLEAR_PGM_POOL and VINF_PGM_HANDLER_ALREADY_ALIASED cases. */
1151	# ifdef VBOX_STRICT
1152	uint64_t fFlags;
1153	RTHCPHYS HCPhys;
1154	rc = PGMShwGetPage(pVCpu, (RTGCPTR)GCPhys, &fFlags, &HCPhys);
1155	Assert(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1156	# endif
1157	# endif
1158	rc = PGMPrefetchPage(pVCpu, (RTGCPTR)GCPhys);
1159	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1160	return VINF_SUCCESS;
1161	}
1162
1163
1164	/**
1165	* Mapping a HC page in place of an MMIO page for direct access.
1166	*
1167	* (This is a special optimization used by the APIC in the VT-x case.)
1168	*
1169	* @returns VBox status code.
1170	*
1171	* @param pVM The cross context VM structure.
1172	* @param pVCpu The cross context virtual CPU structure.
1173	* @param GCPhys The address of the MMIO page to be changed.
1174	* @param HCPhys The address of the host physical page.
1175	* @param fPageFlags Page flags to set. Must be (X86_PTE_RW \| X86_PTE_P)
1176	* for the time being.
1177	*/
1178	VMMDECL(int) IOMMMIOMapMMIOHCPage(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, RTHCPHYS HCPhys, uint64_t fPageFlags)
1179	{
1180	/* Currently only called from VT-x code during a page fault. */
1181	Log(("IOMMMIOMapMMIOHCPage %RGp -> %RGp flags=%RX64\n", GCPhys, HCPhys, fPageFlags));
1182
1183	AssertReturn(fPageFlags == (X86_PTE_RW \| X86_PTE_P), VERR_INVALID_PARAMETER);
1184	/** @todo NEM: MMIO page aliasing. */
1185	Assert(HMIsEnabled(pVM));
1186
1187	/*
1188	* Lookup the context range node the page belongs to.
1189	*/
1190	# ifdef VBOX_STRICT
1191	/* Can't lock IOM here due to potential deadlocks in the VGA device; not safe to access. */
1192	PIOMMMIORANGE pRange = iomMMIOGetRangeUnsafe(pVM, pVCpu, GCPhys);
1193	AssertMsgReturn(pRange,
1194	("Handlers and page tables are out of sync or something! GCPhys=%RGp\n", GCPhys), VERR_IOM_MMIO_RANGE_NOT_FOUND);
1195	Assert((pRange->GCPhys & PAGE_OFFSET_MASK) == 0);
1196	Assert((pRange->Core.KeyLast & PAGE_OFFSET_MASK) == PAGE_OFFSET_MASK);
1197	# endif
1198
1199	/*
1200	* Do the aliasing; page align the addresses since PGM is picky.
1201	*/
1202	GCPhys &= ~(RTGCPHYS)PAGE_OFFSET_MASK;
1203	HCPhys &= ~(RTHCPHYS)PAGE_OFFSET_MASK;
1204
1205	int rc = PGMHandlerPhysicalPageAliasHC(pVM, GCPhys, GCPhys, HCPhys);
1206	AssertRCReturn(rc, rc);
1207
1208	/*
1209	* Modify the shadow page table. Since it's an MMIO page it won't be present and we
1210	* can simply prefetch it.
1211	*
1212	* Note: This is a NOP in the EPT case; we'll just let it fault again to resync the page.
1213	*/
1214	rc = PGMPrefetchPage(pVCpu, (RTGCPTR)GCPhys);
1215	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1216	return VINF_SUCCESS;
1217	}
1218
1219
1220	/**
1221	* Reset a previously modified MMIO region; restore the access flags.
1222	*
1223	* @returns VBox status code.
1224	*
1225	* @param pVM The cross context VM structure.
1226	* @param GCPhys Physical address that's part of the MMIO region to be reset.
1227	*/
1228	VMMDECL(int) IOMMMIOResetRegion(PVM pVM, RTGCPHYS GCPhys)
1229	{
1230	Log(("IOMMMIOResetRegion %RGp\n", GCPhys));
1231
1232	PVMCPU pVCpu = VMMGetCpu(pVM);
1233
1234	/* This currently only works in real mode, protected mode without paging or with nested paging. */
1235	/** @todo NEM: MMIO page aliasing. */
1236	if ( !HMIsEnabled(pVM) /* useless without VT-x/AMD-V */
1237	\|\| ( CPUMIsGuestInPagedProtectedMode(pVCpu)
1238	&& !HMIsNestedPagingActive(pVM)))
1239	return VINF_SUCCESS; /* ignore */
1240
1241	/*
1242	* Lookup the context range node the page belongs to.
1243	*/
1244	# ifdef VBOX_STRICT
1245	/* Can't lock IOM here due to potential deadlocks in the VGA device; not safe to access. */
1246	PIOMMMIORANGE pRange = iomMMIOGetRangeUnsafe(pVM, pVCpu, GCPhys);
1247	AssertMsgReturn(pRange,
1248	("Handlers and page tables are out of sync or something! GCPhys=%RGp\n", GCPhys), VERR_IOM_MMIO_RANGE_NOT_FOUND);
1249	Assert((pRange->GCPhys & PAGE_OFFSET_MASK) == 0);
1250	Assert((pRange->Core.KeyLast & PAGE_OFFSET_MASK) == PAGE_OFFSET_MASK);
1251	# endif
1252
1253	/*
1254	* Call PGM to do the job work.
1255	*
1256	* After the call, all the pages should be non-present... unless there is
1257	* a page pool flush pending (unlikely).
1258	*/
1259	int rc = PGMHandlerPhysicalReset(pVM, GCPhys);
1260	AssertRC(rc);
1261
1262	# ifdef VBOX_STRICT
1263	if (!VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3))
1264	{
1265	uint32_t cb = pRange->cb;
1266	GCPhys = pRange->GCPhys;
1267	while (cb)
1268	{
1269	uint64_t fFlags;
1270	RTHCPHYS HCPhys;
1271	rc = PGMShwGetPage(pVCpu, (RTGCPTR)GCPhys, &fFlags, &HCPhys);
1272	Assert(rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1273	cb -= PAGE_SIZE;
1274	GCPhys += PAGE_SIZE;
1275	}
1276	}
1277	# endif
1278	return rc;
1279	}
1280
1281	#endif /* !IN_RC */
1282

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source: vbox/trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp@ 72493

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