GIM.cpp@ 96789

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1	/* $Id: GIM.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* GIM - Guest Interface Manager.
4	*/
5
6	/*
7	* Copyright (C) 2014-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	/** @page pg_gim GIM - The Guest Interface Manager
29	*
30	* The Guest Interface Manager abstracts an interface provider through which
31	* guests may interact with the hypervisor.
32	*
33	* @see grp_gim
34	*
35	*
36	* @section sec_gim_provider Providers
37	*
38	* A GIM provider implements a particular hypervisor interface such as Microsoft
39	* Hyper-V, Linux KVM and so on. It hooks into various components in the VMM to
40	* ease the guest in running under a recognized, virtualized environment.
41	*
42	* The GIM provider configured for the VM needs to be recognized by the guest OS
43	* in order to make use of features supported by the interface. Since it
44	* requires co-operation from the guest OS, a GIM provider may also be referred to
45	* as a paravirtualization interface.
46	*
47	* One of the goals of having a paravirtualized interface is for enabling guests
48	* to be more accurate and efficient when operating in a virtualized
49	* environment. For instance, a guest OS which interfaces to VirtualBox through
50	* a GIM provider may rely on the provider for supplying the correct TSC
51	* frequency of the host processor. The guest can then avoid caliberating the
52	* TSC itself, resulting in higher accuracy and better performance.
53	*
54	* At most, only one GIM provider can be active for a running VM and cannot be
55	* changed during the lifetime of the VM.
56	*/
57
58
59	/*********************************************************************************************************************************
60	* Header Files *
61	*********************************************************************************************************************************/
62	#define LOG_GROUP LOG_GROUP_GIM
63	#include <VBox/vmm/gim.h>
64	#include <VBox/vmm/hm.h>
65	#include <VBox/vmm/ssm.h>
66	#include <VBox/vmm/pdmdev.h>
67	#include "GIMInternal.h"
68	#include <VBox/vmm/vm.h>
69
70	#include <VBox/log.h>
71
72	#include <iprt/err.h>
73	#include <iprt/semaphore.h>
74	#include <iprt/string.h>
75
76	/* Include all GIM providers. */
77	#include "GIMMinimalInternal.h"
78	#include "GIMHvInternal.h"
79	#include "GIMKvmInternal.h"
80
81
82	/*********************************************************************************************************************************
83	* Internal Functions *
84	*********************************************************************************************************************************/
85	static FNSSMINTSAVEEXEC gimR3Save;
86	static FNSSMINTLOADEXEC gimR3Load;
87	static FNSSMINTLOADDONE gimR3LoadDone;
88
89
90	/**
91	* Initializes the GIM.
92	*
93	* @returns VBox status code.
94	* @param pVM The cross context VM structure.
95	*/
96	VMMR3_INT_DECL(int) GIMR3Init(PVM pVM)
97	{
98	LogFlow(("GIMR3Init\n"));
99
100	/*
101	* Assert alignment and sizes.
102	*/
103	AssertCompile(sizeof(pVM->gim.s) <= sizeof(pVM->gim.padding));
104	AssertCompile(sizeof(pVM->apCpusR3[0]->gim.s) <= sizeof(pVM->apCpusR3[0]->gim.padding));
105
106	/*
107	* Initialize members.
108	*/
109	pVM->gim.s.hSemiReadOnlyMmio2Handler = NIL_PGMPHYSHANDLERTYPE;
110
111	/*
112	* Register the saved state data unit.
113	*/
114	int rc = SSMR3RegisterInternal(pVM, "GIM", 0 /* uInstance */, GIM_SAVED_STATE_VERSION, sizeof(GIM),
115	NULL /* pfnLivePrep /, NULL / pfnLiveExec /, NULL / pfnLiveVote*/,
116	NULL /* pfnSavePrep /, gimR3Save, NULL / pfnSaveDone */,
117	NULL /* pfnLoadPrep */, gimR3Load, gimR3LoadDone);
118	if (RT_FAILURE(rc))
119	return rc;
120
121	/*
122	* Read configuration.
123	*/
124	PCFGMNODE pCfgNode = CFGMR3GetChild(CFGMR3GetRoot(pVM), "GIM/");
125
126	/*
127	* Validate the GIM settings.
128	*/
129	rc = CFGMR3ValidateConfig(pCfgNode, "/GIM/", /* pszNode */
130	"Provider" /* pszValidValues */
131	"\|Version",
132	"HyperV", /* pszValidNodes */
133	"GIM", /* pszWho */
134	0); /* uInstance */
135	if (RT_FAILURE(rc))
136	return rc;
137
138	/** @cfgm{/GIM/Provider, string}
139	* The name of the GIM provider. The default is "none". */
140	char szProvider[64];
141	rc = CFGMR3QueryStringDef(pCfgNode, "Provider", szProvider, sizeof(szProvider), "None");
142	AssertLogRelRCReturn(rc, rc);
143
144	/** @cfgm{/GIM/Version, uint32_t}
145	* The interface version. The default is 0, which means "provide the most
146	* up-to-date implementation". */
147	uint32_t uVersion;
148	rc = CFGMR3QueryU32Def(pCfgNode, "Version", &uVersion, 0 /* default */);
149	AssertLogRelRCReturn(rc, rc);
150
151	/*
152	* Setup the GIM provider for this VM.
153	*/
154	LogRel(("GIM: Using provider '%s' (Implementation version: %u)\n", szProvider, uVersion));
155	if (!RTStrCmp(szProvider, "None"))
156	pVM->gim.s.enmProviderId = GIMPROVIDERID_NONE;
157	else
158	{
159	pVM->gim.s.u32Version = uVersion;
160	/** @todo r=bird: Because u32Version is saved, it should be translated to the
161	* 'most up-to-date implementation' version number when 0. Otherwise,
162	* we'll have abiguities when loading the state of older VMs. */
163	if (!RTStrCmp(szProvider, "Minimal"))
164	{
165	pVM->gim.s.enmProviderId = GIMPROVIDERID_MINIMAL;
166	rc = gimR3MinimalInit(pVM);
167	}
168	else if (!RTStrCmp(szProvider, "HyperV"))
169	{
170	pVM->gim.s.enmProviderId = GIMPROVIDERID_HYPERV;
171	rc = gimR3HvInit(pVM, pCfgNode);
172	}
173	else if (!RTStrCmp(szProvider, "KVM"))
174	{
175	pVM->gim.s.enmProviderId = GIMPROVIDERID_KVM;
176	rc = gimR3KvmInit(pVM);
177	}
178	else
179	rc = VMR3SetError(pVM->pUVM, VERR_GIM_INVALID_PROVIDER, RT_SRC_POS, "Provider '%s' unknown.", szProvider);
180	}
181
182	/*
183	* Statistics.
184	*/
185	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmit, STAMTYPE_COUNTER, "/GIM/Debug/Transmit", STAMUNIT_OCCURENCES, "Debug packets sent.");
186	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmitBytes, STAMTYPE_COUNTER, "/GIM/Debug/TransmitBytes", STAMUNIT_OCCURENCES, "Debug bytes sent.");
187	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecv, STAMTYPE_COUNTER, "/GIM/Debug/Receive", STAMUNIT_OCCURENCES, "Debug packets received.");
188	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecvBytes, STAMTYPE_COUNTER, "/GIM/Debug/ReceiveBytes", STAMUNIT_OCCURENCES, "Debug bytes received.");
189
190	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatHypercalls, STAMTYPE_COUNTER, "/GIM/Hypercalls", STAMUNIT_OCCURENCES, "Number of hypercalls initiated.");
191	return rc;
192	}
193
194
195	/**
196	* Initializes the remaining bits of the GIM provider.
197	*
198	* This is called after initializing HM and most other VMM components.
199	*
200	* @returns VBox status code.
201	* @param pVM The cross context VM structure.
202	* @thread EMT(0)
203	*/
204	VMMR3_INT_DECL(int) GIMR3InitCompleted(PVM pVM)
205	{
206	switch (pVM->gim.s.enmProviderId)
207	{
208	case GIMPROVIDERID_MINIMAL:
209	return gimR3MinimalInitCompleted(pVM);
210
211	case GIMPROVIDERID_HYPERV:
212	return gimR3HvInitCompleted(pVM);
213
214	case GIMPROVIDERID_KVM:
215	return gimR3KvmInitCompleted(pVM);
216
217	default:
218	break;
219	}
220
221	if (!TMR3CpuTickIsFixedRateMonotonic(pVM, true /* fWithParavirtEnabled */))
222	LogRel(("GIM: Warning!!! Host TSC is unstable. The guest may behave unpredictably with a paravirtualized clock.\n"));
223
224	return VINF_SUCCESS;
225	}
226
227
228	/**
229	* @callback_method_impl{FNSSMINTSAVEEXEC}
230	*/
231	static DECLCALLBACK(int) gimR3Save(PVM pVM, PSSMHANDLE pSSM)
232	{
233	AssertReturn(pVM, VERR_INVALID_PARAMETER);
234	AssertReturn(pSSM, VERR_SSM_INVALID_STATE);
235
236	int rc = VINF_SUCCESS;
237	#if 0
238	/* Save per-CPU data. */
239	SSMR3PutU32(pSSM, pVM->cCpus);
240	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
241	{
242	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
243	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
244	}
245	#endif
246
247	/*
248	* Save per-VM data.
249	*/
250	SSMR3PutU32(pSSM, pVM->gim.s.enmProviderId);
251	SSMR3PutU32(pSSM, pVM->gim.s.u32Version);
252
253	/*
254	* Save provider-specific data.
255	*/
256	switch (pVM->gim.s.enmProviderId)
257	{
258	case GIMPROVIDERID_HYPERV:
259	rc = gimR3HvSave(pVM, pSSM);
260	AssertRCReturn(rc, rc);
261	break;
262
263	case GIMPROVIDERID_KVM:
264	rc = gimR3KvmSave(pVM, pSSM);
265	AssertRCReturn(rc, rc);
266	break;
267
268	default:
269	break;
270	}
271
272	return rc;
273	}
274
275
276	/**
277	* @callback_method_impl{FNSSMINTLOADEXEC}
278	*/
279	static DECLCALLBACK(int) gimR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
280	{
281	if (uPass != SSM_PASS_FINAL)
282	return VINF_SUCCESS;
283	if (uVersion != GIM_SAVED_STATE_VERSION)
284	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
285
286	int rc;
287	#if 0
288	/* Load per-CPU data. */
289	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
290	{
291	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
292	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
293	}
294	#endif
295
296	/*
297	* Load per-VM data.
298	*/
299	uint32_t uProviderId;
300	uint32_t uProviderVersion;
301
302	SSMR3GetU32(pSSM, &uProviderId);
303	rc = SSMR3GetU32(pSSM, &uProviderVersion);
304	AssertRCReturn(rc, rc);
305
306	if ((GIMPROVIDERID)uProviderId != pVM->gim.s.enmProviderId)
307	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider %u differs from the configured one (%u)."),
308	uProviderId, pVM->gim.s.enmProviderId);
309	#if 0 /** @todo r=bird: Figure out what you mean to do here with the version. */
310	if (uProviderVersion != pVM->gim.s.u32Version)
311	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider version %u differs from the configured one (%u)."),
312	uProviderVersion, pVM->gim.s.u32Version);
313	#else
314	pVM->gim.s.u32Version = uProviderVersion;
315	#endif
316
317	/*
318	* Load provider-specific data.
319	*/
320	switch (pVM->gim.s.enmProviderId)
321	{
322	case GIMPROVIDERID_HYPERV:
323	rc = gimR3HvLoad(pVM, pSSM);
324	AssertRCReturn(rc, rc);
325	break;
326
327	case GIMPROVIDERID_KVM:
328	rc = gimR3KvmLoad(pVM, pSSM);
329	AssertRCReturn(rc, rc);
330	break;
331
332	default:
333	break;
334	}
335
336	return VINF_SUCCESS;
337	}
338
339
340	/**
341	* @callback_method_impl{FNSSMINTLOADDONE}
342	*/
343	static DECLCALLBACK(int) gimR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
344	{
345	switch (pVM->gim.s.enmProviderId)
346	{
347	case GIMPROVIDERID_HYPERV:
348	return gimR3HvLoadDone(pVM, pSSM);
349
350	default:
351	return VINF_SUCCESS;
352	}
353	}
354
355
356	/**
357	* Terminates the GIM.
358	*
359	* Termination means cleaning up and freeing all resources,
360	* the VM itself is, at this point, powered off or suspended.
361	*
362	* @returns VBox status code.
363	* @param pVM The cross context VM structure.
364	*/
365	VMMR3_INT_DECL(int) GIMR3Term(PVM pVM)
366	{
367	switch (pVM->gim.s.enmProviderId)
368	{
369	case GIMPROVIDERID_HYPERV:
370	return gimR3HvTerm(pVM);
371
372	case GIMPROVIDERID_KVM:
373	return gimR3KvmTerm(pVM);
374
375	default:
376	break;
377	}
378	return VINF_SUCCESS;
379	}
380
381
382	/**
383	* Applies relocations to data and code managed by this
384	* component. This function will be called at init and
385	* whenever the VMM need to relocate it self inside the GC.
386	*
387	* @param pVM The cross context VM structure.
388	* @param offDelta Relocation delta relative to old location.
389	*/
390	VMMR3_INT_DECL(void) GIMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
391	{
392	switch (pVM->gim.s.enmProviderId)
393	{
394	case GIMPROVIDERID_HYPERV:
395	gimR3HvRelocate(pVM, offDelta);
396	break;
397
398	default:
399	break;
400	}
401	}
402
403
404	/**
405	* The VM is being reset.
406	*
407	* For the GIM component this means unmapping and unregistering MMIO2 regions
408	* and other provider-specific resets.
409	*
410	* @returns VBox status code.
411	* @param pVM The cross context VM structure.
412	*/
413	VMMR3_INT_DECL(void) GIMR3Reset(PVM pVM)
414	{
415	switch (pVM->gim.s.enmProviderId)
416	{
417	case GIMPROVIDERID_HYPERV:
418	return gimR3HvReset(pVM);
419
420	case GIMPROVIDERID_KVM:
421	return gimR3KvmReset(pVM);
422
423	default:
424	break;
425	}
426	}
427
428
429	/**
430	* Registers the GIM device with VMM.
431	*
432	* @param pVM The cross context VM structure.
433	* @param pDevIns Pointer to the GIM device instance.
434	* @param pDbg Pointer to the GIM device debug structure, can be
435	* NULL.
436	*/
437	VMMR3DECL(void) GIMR3GimDeviceRegister(PVM pVM, PPDMDEVINS pDevIns, PGIMDEBUG pDbg)
438	{
439	pVM->gim.s.pDevInsR3 = pDevIns;
440	pVM->gim.s.pDbgR3 = pDbg;
441	}
442
443
444	/**
445	* Gets debug setup specified by the provider.
446	*
447	* @returns VBox status code.
448	* @param pVM The cross context VM structure.
449	* @param pDbgSetup Where to store the debug setup details.
450	*/
451	VMMR3DECL(int) GIMR3GetDebugSetup(PVM pVM, PGIMDEBUGSETUP pDbgSetup)
452	{
453	AssertReturn(pVM, VERR_INVALID_PARAMETER);
454	AssertReturn(pDbgSetup, VERR_INVALID_PARAMETER);
455
456	switch (pVM->gim.s.enmProviderId)
457	{
458	case GIMPROVIDERID_HYPERV:
459	return gimR3HvGetDebugSetup(pVM, pDbgSetup);
460	default:
461	break;
462	}
463	return VERR_GIM_NO_DEBUG_CONNECTION;
464	}
465
466
467	/**
468	* Read data from a host debug session.
469	*
470	* @returns VBox status code.
471	*
472	* @param pVM The cross context VM structure.
473	* @param pvRead The read buffer.
474	* @param pcbRead The size of the read buffer as well as where to store
475	* the number of bytes read.
476	* @param pfnReadComplete Callback when the buffer has been read and
477	* before signalling reading of the next buffer.
478	* Optional, can be NULL.
479	* @thread EMT.
480	*/
481	VMMR3_INT_DECL(int) gimR3DebugRead(PVM pVM, void pvRead, size_t pcbRead, PFNGIMDEBUGBUFREADCOMPLETED pfnReadComplete)
482	{
483	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
484	if (pDbg)
485	{
486	if (ASMAtomicReadBool(&pDbg->fDbgRecvBufRead) == true)
487	{
488	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgRecv);
489	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgRecvBytes, pDbg->cbDbgRecvBufRead);
490
491	memcpy(pvRead, pDbg->pvDbgRecvBuf, pDbg->cbDbgRecvBufRead);
492	*pcbRead = pDbg->cbDbgRecvBufRead;
493	if (pfnReadComplete)
494	pfnReadComplete(pVM);
495	RTSemEventMultiSignal(pDbg->hDbgRecvThreadSem);
496	ASMAtomicWriteBool(&pDbg->fDbgRecvBufRead, false);
497	return VINF_SUCCESS;
498	}
499	else
500	*pcbRead = 0;
501	return VERR_NO_DATA;
502	}
503	return VERR_GIM_NO_DEBUG_CONNECTION;
504	}
505
506
507	/**
508	* Write data to a host debug session.
509	*
510	* @returns VBox status code.
511	*
512	* @param pVM The cross context VM structure.
513	* @param pvWrite The write buffer.
514	* @param pcbWrite The size of the write buffer as well as where to store
515	* the number of bytes written.
516	* @thread EMT.
517	*/
518	VMMR3_INT_DECL(int) gimR3DebugWrite(PVM pVM, void pvWrite, size_t pcbWrite)
519	{
520	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
521	if (pDbg)
522	{
523	PPDMISTREAM pDbgStream = pDbg->pDbgDrvStream;
524	if (pDbgStream)
525	{
526	size_t cbWrite = *pcbWrite;
527	int rc = pDbgStream->pfnWrite(pDbgStream, pvWrite, pcbWrite);
528	if ( RT_SUCCESS(rc)
529	&& *pcbWrite == cbWrite)
530	{
531	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgXmit);
532	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgXmitBytes, *pcbWrite);
533	}
534	return rc;
535	}
536	}
537	return VERR_GIM_NO_DEBUG_CONNECTION;
538	}
539
540	#if 0 /* ??? */
541
542	/**
543	* @callback_method_impl{FNPGMPHYSHANDLER,
544	* Write access handler for mapped MMIO2 pages. Currently ignores writes.}
545	*
546	* @todo In the future we might want to let the GIM provider decide what the
547	* handler should do (like throwing \#GP faults).
548	*/
549	static DECLCALLBACK(VBOXSTRICTRC) gimR3Mmio2WriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, void pvPhys, void pvBuf,
550	size_t cbBuf, PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin,
551	void *pvUser)
552	{
553	RT_NOREF6(pVM, pVCpu, GCPhys, pvPhys, pvBuf, cbBuf);
554	RT_NOREF3(enmAccessType, enmOrigin, pvUser);
555
556	/*
557	* Ignore writes to the mapped MMIO2 page.
558	*/
559	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
560	return VINF_SUCCESS; /** @todo Hyper-V says we should \#GP(0) fault for writes to the Hypercall and TSC page. */
561	}
562
563
564	/**
565	* Unmaps a registered MMIO2 region in the guest address space and removes any
566	* access handlers for it.
567	*
568	* @returns VBox status code.
569	* @param pVM The cross context VM structure.
570	* @param pRegion Pointer to the GIM MMIO2 region.
571	*/
572	VMMR3_INT_DECL(int) gimR3Mmio2Unmap(PVM pVM, PGIMMMIO2REGION pRegion)
573	{
574	AssertPtr(pVM);
575	AssertPtr(pRegion);
576
577	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
578	AssertPtr(pDevIns);
579	if (pRegion->fMapped)
580	{
581	int rc = PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
582	AssertRC(rc);
583
584	rc = PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, pRegion->GCPhysPage);
585	if (RT_SUCCESS(rc))
586	{
587	pRegion->fMapped = false;
588	pRegion->GCPhysPage = NIL_RTGCPHYS;
589	}
590	}
591	return VINF_SUCCESS;
592	}
593
594
595	/**
596	* Maps a registered MMIO2 region in the guest address space.
597	*
598	* The region will be made read-only and writes from the guest will be ignored.
599	*
600	* @returns VBox status code.
601	* @param pVM The cross context VM structure.
602	* @param pRegion Pointer to the GIM MMIO2 region.
603	* @param GCPhysRegion Where in the guest address space to map the region.
604	*/
605	VMMR3_INT_DECL(int) GIMR3Mmio2Map(PVM pVM, PGIMMMIO2REGION pRegion, RTGCPHYS GCPhysRegion)
606	{
607	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
608	AssertPtr(pDevIns);
609
610	/* The guest-physical address must be page-aligned. */
611	if (GCPhysRegion & GUEST_PAGE_OFFSET_MASK)
612	{
613	LogFunc(("%s: %#RGp not paging aligned\n", pRegion->szDescription, GCPhysRegion));
614	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
615	}
616
617	/* Allow only normal pages to be overlaid using our MMIO2 pages (disallow MMIO, ROM, reserved pages). */
618	/** @todo Hyper-V doesn't seem to be very strict about this, may be relax
619	* later if some guest really requires it. */
620	if (!PGMPhysIsGCPhysNormal(pVM, GCPhysRegion))
621	{
622	LogFunc(("%s: %#RGp is not normal memory\n", pRegion->szDescription, GCPhysRegion));
623	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
624	}
625
626	if (!pRegion->fRegistered)
627	{
628	LogFunc(("%s: Region has not been registered.\n", pRegion->szDescription));
629	return VERR_GIM_IPE_1;
630	}
631
632	/*
633	* Map the MMIO2 region over the specified guest-physical address.
634	*/
635	int rc = PDMDevHlpMMIOExMap(pDevIns, NULL, pRegion->iRegion, GCPhysRegion);
636	if (RT_SUCCESS(rc))
637	{
638	/*
639	* Install access-handlers for the mapped page to prevent (ignore) writes to it
640	* from the guest.
641	*/
642	if (pVM->gim.s.hSemiReadOnlyMmio2Handler == NIL_PGMPHYSHANDLERTYPE)
643	rc = PGMR3HandlerPhysicalTypeRegister(pVM, PGMPHYSHANDLERKIND_WRITE,
644	gimR3Mmio2WriteHandler,
645	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NULL / pszPfHandlerR0 */,
646	NULL /* pszModRC /, NULL / pszHandlerRC /, NULL / pszPfHandlerRC */,
647	"GIM read-only MMIO2 handler",
648	&pVM->gim.s.hSemiReadOnlyMmio2Handler);
649	if (RT_SUCCESS(rc))
650	{
651	rc = PGMHandlerPhysicalRegister(pVM, GCPhysRegion, GCPhysRegion + (pRegion->cbRegion - 1),
652	pVM->gim.s.hSemiReadOnlyMmio2Handler,
653	NULL /* pvUserR3 /, NIL_RTR0PTR / pvUserR0 /, NIL_RTRCPTR / pvUserRC */,
654	pRegion->szDescription);
655	if (RT_SUCCESS(rc))
656	{
657	pRegion->fMapped = true;
658	pRegion->GCPhysPage = GCPhysRegion;
659	return rc;
660	}
661	}
662
663	PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, GCPhysRegion);
664	}
665
666	return rc;
667	}
668
669
670	/**
671	* Registers the physical handler for the registered and mapped MMIO2 region.
672	*
673	* @returns VBox status code.
674	* @param pVM The cross context VM structure.
675	* @param pRegion Pointer to the GIM MMIO2 region.
676	*/
677	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalRegister(PVM pVM, PGIMMMIO2REGION pRegion)
678	{
679	AssertPtr(pRegion);
680	AssertReturn(pRegion->fRegistered, VERR_GIM_IPE_2);
681	AssertReturn(pRegion->fMapped, VERR_GIM_IPE_3);
682
683	return PGMR3HandlerPhysicalRegister(pVM,
684	PGMPHYSHANDLERKIND_WRITE,
685	pRegion->GCPhysPage, pRegion->GCPhysPage + (pRegion->cbRegion - 1),
686	gimR3Mmio2WriteHandler, NULL /* pvUserR3 */,
687	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NIL_RTR0PTR / pvUserR0 */,
688	NULL /* pszModRC /, NULL / pszHandlerRC /, NIL_RTRCPTR / pvUserRC */,
689	pRegion->szDescription);
690	}
691
692
693	/**
694	* Deregisters the physical handler for the MMIO2 region.
695	*
696	* @returns VBox status code.
697	* @param pVM The cross context VM structure.
698	* @param pRegion Pointer to the GIM MMIO2 region.
699	*/
700	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalDeregister(PVM pVM, PGIMMMIO2REGION pRegion)
701	{
702	return PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
703	}
704
705	#endif
706

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source: vbox/trunk/src/VBox/VMM/VMMR3/GIM.cpp@ 96789

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