GIM.cpp@ 93444

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1	/* $Id: GIM.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* GIM - Guest Interface Manager.
4	*/
5
6	/*
7	* Copyright (C) 2014-2022 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	/** @page pg_gim GIM - The Guest Interface Manager
19	*
20	* The Guest Interface Manager abstracts an interface provider through which
21	* guests may interact with the hypervisor.
22	*
23	* @see grp_gim
24	*
25	*
26	* @section sec_gim_provider Providers
27	*
28	* A GIM provider implements a particular hypervisor interface such as Microsoft
29	* Hyper-V, Linux KVM and so on. It hooks into various components in the VMM to
30	* ease the guest in running under a recognized, virtualized environment.
31	*
32	* The GIM provider configured for the VM needs to be recognized by the guest OS
33	* in order to make use of features supported by the interface. Since it
34	* requires co-operation from the guest OS, a GIM provider may also be referred to
35	* as a paravirtualization interface.
36	*
37	* One of the goals of having a paravirtualized interface is for enabling guests
38	* to be more accurate and efficient when operating in a virtualized
39	* environment. For instance, a guest OS which interfaces to VirtualBox through
40	* a GIM provider may rely on the provider for supplying the correct TSC
41	* frequency of the host processor. The guest can then avoid caliberating the
42	* TSC itself, resulting in higher accuracy and better performance.
43	*
44	* At most, only one GIM provider can be active for a running VM and cannot be
45	* changed during the lifetime of the VM.
46	*/
47
48
49	/*********************************************************************************************************************************
50	* Header Files *
51	*********************************************************************************************************************************/
52	#define LOG_GROUP LOG_GROUP_GIM
53	#include <VBox/vmm/gim.h>
54	#include <VBox/vmm/hm.h>
55	#include <VBox/vmm/ssm.h>
56	#include <VBox/vmm/pdmdev.h>
57	#include "GIMInternal.h"
58	#include <VBox/vmm/vm.h>
59
60	#include <VBox/log.h>
61
62	#include <iprt/err.h>
63	#include <iprt/semaphore.h>
64	#include <iprt/string.h>
65
66	/* Include all GIM providers. */
67	#include "GIMMinimalInternal.h"
68	#include "GIMHvInternal.h"
69	#include "GIMKvmInternal.h"
70
71
72	/*********************************************************************************************************************************
73	* Internal Functions *
74	*********************************************************************************************************************************/
75	static FNSSMINTSAVEEXEC gimR3Save;
76	static FNSSMINTLOADEXEC gimR3Load;
77	static FNSSMINTLOADDONE gimR3LoadDone;
78
79
80	/**
81	* Initializes the GIM.
82	*
83	* @returns VBox status code.
84	* @param pVM The cross context VM structure.
85	*/
86	VMMR3_INT_DECL(int) GIMR3Init(PVM pVM)
87	{
88	LogFlow(("GIMR3Init\n"));
89
90	/*
91	* Assert alignment and sizes.
92	*/
93	AssertCompile(sizeof(pVM->gim.s) <= sizeof(pVM->gim.padding));
94	AssertCompile(sizeof(pVM->apCpusR3[0]->gim.s) <= sizeof(pVM->apCpusR3[0]->gim.padding));
95
96	/*
97	* Initialize members.
98	*/
99	pVM->gim.s.hSemiReadOnlyMmio2Handler = NIL_PGMPHYSHANDLERTYPE;
100
101	/*
102	* Register the saved state data unit.
103	*/
104	int rc = SSMR3RegisterInternal(pVM, "GIM", 0 /* uInstance */, GIM_SAVED_STATE_VERSION, sizeof(GIM),
105	NULL /* pfnLivePrep /, NULL / pfnLiveExec /, NULL / pfnLiveVote*/,
106	NULL /* pfnSavePrep /, gimR3Save, NULL / pfnSaveDone */,
107	NULL /* pfnLoadPrep */, gimR3Load, gimR3LoadDone);
108	if (RT_FAILURE(rc))
109	return rc;
110
111	/*
112	* Read configuration.
113	*/
114	PCFGMNODE pCfgNode = CFGMR3GetChild(CFGMR3GetRoot(pVM), "GIM/");
115
116	/*
117	* Validate the GIM settings.
118	*/
119	rc = CFGMR3ValidateConfig(pCfgNode, "/GIM/", /* pszNode */
120	"Provider" /* pszValidValues */
121	"\|Version",
122	"HyperV", /* pszValidNodes */
123	"GIM", /* pszWho */
124	0); /* uInstance */
125	if (RT_FAILURE(rc))
126	return rc;
127
128	/** @cfgm{/GIM/Provider, string}
129	* The name of the GIM provider. The default is "none". */
130	char szProvider[64];
131	rc = CFGMR3QueryStringDef(pCfgNode, "Provider", szProvider, sizeof(szProvider), "None");
132	AssertLogRelRCReturn(rc, rc);
133
134	/** @cfgm{/GIM/Version, uint32_t}
135	* The interface version. The default is 0, which means "provide the most
136	* up-to-date implementation". */
137	uint32_t uVersion;
138	rc = CFGMR3QueryU32Def(pCfgNode, "Version", &uVersion, 0 /* default */);
139	AssertLogRelRCReturn(rc, rc);
140
141	/*
142	* Setup the GIM provider for this VM.
143	*/
144	LogRel(("GIM: Using provider '%s' (Implementation version: %u)\n", szProvider, uVersion));
145	if (!RTStrCmp(szProvider, "None"))
146	pVM->gim.s.enmProviderId = GIMPROVIDERID_NONE;
147	else
148	{
149	pVM->gim.s.u32Version = uVersion;
150	/** @todo r=bird: Because u32Version is saved, it should be translated to the
151	* 'most up-to-date implementation' version number when 0. Otherwise,
152	* we'll have abiguities when loading the state of older VMs. */
153	if (!RTStrCmp(szProvider, "Minimal"))
154	{
155	pVM->gim.s.enmProviderId = GIMPROVIDERID_MINIMAL;
156	rc = gimR3MinimalInit(pVM);
157	}
158	else if (!RTStrCmp(szProvider, "HyperV"))
159	{
160	pVM->gim.s.enmProviderId = GIMPROVIDERID_HYPERV;
161	rc = gimR3HvInit(pVM, pCfgNode);
162	}
163	else if (!RTStrCmp(szProvider, "KVM"))
164	{
165	pVM->gim.s.enmProviderId = GIMPROVIDERID_KVM;
166	rc = gimR3KvmInit(pVM);
167	}
168	else
169	rc = VMR3SetError(pVM->pUVM, VERR_GIM_INVALID_PROVIDER, RT_SRC_POS, "Provider '%s' unknown.", szProvider);
170	}
171
172	/*
173	* Statistics.
174	*/
175	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmit, STAMTYPE_COUNTER, "/GIM/Debug/Transmit", STAMUNIT_OCCURENCES, "Debug packets sent.");
176	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmitBytes, STAMTYPE_COUNTER, "/GIM/Debug/TransmitBytes", STAMUNIT_OCCURENCES, "Debug bytes sent.");
177	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecv, STAMTYPE_COUNTER, "/GIM/Debug/Receive", STAMUNIT_OCCURENCES, "Debug packets received.");
178	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecvBytes, STAMTYPE_COUNTER, "/GIM/Debug/ReceiveBytes", STAMUNIT_OCCURENCES, "Debug bytes received.");
179
180	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatHypercalls, STAMTYPE_COUNTER, "/GIM/Hypercalls", STAMUNIT_OCCURENCES, "Number of hypercalls initiated.");
181	return rc;
182	}
183
184
185	/**
186	* Initializes the remaining bits of the GIM provider.
187	*
188	* This is called after initializing HM and most other VMM components.
189	*
190	* @returns VBox status code.
191	* @param pVM The cross context VM structure.
192	* @thread EMT(0)
193	*/
194	VMMR3_INT_DECL(int) GIMR3InitCompleted(PVM pVM)
195	{
196	switch (pVM->gim.s.enmProviderId)
197	{
198	case GIMPROVIDERID_MINIMAL:
199	return gimR3MinimalInitCompleted(pVM);
200
201	case GIMPROVIDERID_HYPERV:
202	return gimR3HvInitCompleted(pVM);
203
204	case GIMPROVIDERID_KVM:
205	return gimR3KvmInitCompleted(pVM);
206
207	default:
208	break;
209	}
210
211	if (!TMR3CpuTickIsFixedRateMonotonic(pVM, true /* fWithParavirtEnabled */))
212	LogRel(("GIM: Warning!!! Host TSC is unstable. The guest may behave unpredictably with a paravirtualized clock.\n"));
213
214	return VINF_SUCCESS;
215	}
216
217
218	/**
219	* @callback_method_impl{FNSSMINTSAVEEXEC}
220	*/
221	static DECLCALLBACK(int) gimR3Save(PVM pVM, PSSMHANDLE pSSM)
222	{
223	AssertReturn(pVM, VERR_INVALID_PARAMETER);
224	AssertReturn(pSSM, VERR_SSM_INVALID_STATE);
225
226	int rc = VINF_SUCCESS;
227	#if 0
228	/* Save per-CPU data. */
229	SSMR3PutU32(pSSM, pVM->cCpus);
230	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
231	{
232	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
233	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
234	}
235	#endif
236
237	/*
238	* Save per-VM data.
239	*/
240	SSMR3PutU32(pSSM, pVM->gim.s.enmProviderId);
241	SSMR3PutU32(pSSM, pVM->gim.s.u32Version);
242
243	/*
244	* Save provider-specific data.
245	*/
246	switch (pVM->gim.s.enmProviderId)
247	{
248	case GIMPROVIDERID_HYPERV:
249	rc = gimR3HvSave(pVM, pSSM);
250	AssertRCReturn(rc, rc);
251	break;
252
253	case GIMPROVIDERID_KVM:
254	rc = gimR3KvmSave(pVM, pSSM);
255	AssertRCReturn(rc, rc);
256	break;
257
258	default:
259	break;
260	}
261
262	return rc;
263	}
264
265
266	/**
267	* @callback_method_impl{FNSSMINTLOADEXEC}
268	*/
269	static DECLCALLBACK(int) gimR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
270	{
271	if (uPass != SSM_PASS_FINAL)
272	return VINF_SUCCESS;
273	if (uVersion != GIM_SAVED_STATE_VERSION)
274	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
275
276	int rc;
277	#if 0
278	/* Load per-CPU data. */
279	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
280	{
281	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
282	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
283	}
284	#endif
285
286	/*
287	* Load per-VM data.
288	*/
289	uint32_t uProviderId;
290	uint32_t uProviderVersion;
291
292	SSMR3GetU32(pSSM, &uProviderId);
293	rc = SSMR3GetU32(pSSM, &uProviderVersion);
294	AssertRCReturn(rc, rc);
295
296	if ((GIMPROVIDERID)uProviderId != pVM->gim.s.enmProviderId)
297	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider %u differs from the configured one (%u)."),
298	uProviderId, pVM->gim.s.enmProviderId);
299	#if 0 /** @todo r=bird: Figure out what you mean to do here with the version. */
300	if (uProviderVersion != pVM->gim.s.u32Version)
301	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider version %u differs from the configured one (%u)."),
302	uProviderVersion, pVM->gim.s.u32Version);
303	#else
304	pVM->gim.s.u32Version = uProviderVersion;
305	#endif
306
307	/*
308	* Load provider-specific data.
309	*/
310	switch (pVM->gim.s.enmProviderId)
311	{
312	case GIMPROVIDERID_HYPERV:
313	rc = gimR3HvLoad(pVM, pSSM);
314	AssertRCReturn(rc, rc);
315	break;
316
317	case GIMPROVIDERID_KVM:
318	rc = gimR3KvmLoad(pVM, pSSM);
319	AssertRCReturn(rc, rc);
320	break;
321
322	default:
323	break;
324	}
325
326	return VINF_SUCCESS;
327	}
328
329
330	/**
331	* @callback_method_impl{FNSSMINTLOADDONE}
332	*/
333	static DECLCALLBACK(int) gimR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
334	{
335	switch (pVM->gim.s.enmProviderId)
336	{
337	case GIMPROVIDERID_HYPERV:
338	return gimR3HvLoadDone(pVM, pSSM);
339
340	default:
341	return VINF_SUCCESS;
342	}
343	}
344
345
346	/**
347	* Terminates the GIM.
348	*
349	* Termination means cleaning up and freeing all resources,
350	* the VM itself is, at this point, powered off or suspended.
351	*
352	* @returns VBox status code.
353	* @param pVM The cross context VM structure.
354	*/
355	VMMR3_INT_DECL(int) GIMR3Term(PVM pVM)
356	{
357	switch (pVM->gim.s.enmProviderId)
358	{
359	case GIMPROVIDERID_HYPERV:
360	return gimR3HvTerm(pVM);
361
362	case GIMPROVIDERID_KVM:
363	return gimR3KvmTerm(pVM);
364
365	default:
366	break;
367	}
368	return VINF_SUCCESS;
369	}
370
371
372	/**
373	* Applies relocations to data and code managed by this
374	* component. This function will be called at init and
375	* whenever the VMM need to relocate it self inside the GC.
376	*
377	* @param pVM The cross context VM structure.
378	* @param offDelta Relocation delta relative to old location.
379	*/
380	VMMR3_INT_DECL(void) GIMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
381	{
382	switch (pVM->gim.s.enmProviderId)
383	{
384	case GIMPROVIDERID_HYPERV:
385	gimR3HvRelocate(pVM, offDelta);
386	break;
387
388	default:
389	break;
390	}
391	}
392
393
394	/**
395	* The VM is being reset.
396	*
397	* For the GIM component this means unmapping and unregistering MMIO2 regions
398	* and other provider-specific resets.
399	*
400	* @returns VBox status code.
401	* @param pVM The cross context VM structure.
402	*/
403	VMMR3_INT_DECL(void) GIMR3Reset(PVM pVM)
404	{
405	switch (pVM->gim.s.enmProviderId)
406	{
407	case GIMPROVIDERID_HYPERV:
408	return gimR3HvReset(pVM);
409
410	case GIMPROVIDERID_KVM:
411	return gimR3KvmReset(pVM);
412
413	default:
414	break;
415	}
416	}
417
418
419	/**
420	* Registers the GIM device with VMM.
421	*
422	* @param pVM The cross context VM structure.
423	* @param pDevIns Pointer to the GIM device instance.
424	* @param pDbg Pointer to the GIM device debug structure, can be
425	* NULL.
426	*/
427	VMMR3DECL(void) GIMR3GimDeviceRegister(PVM pVM, PPDMDEVINS pDevIns, PGIMDEBUG pDbg)
428	{
429	pVM->gim.s.pDevInsR3 = pDevIns;
430	pVM->gim.s.pDbgR3 = pDbg;
431	}
432
433
434	/**
435	* Gets debug setup specified by the provider.
436	*
437	* @returns VBox status code.
438	* @param pVM The cross context VM structure.
439	* @param pDbgSetup Where to store the debug setup details.
440	*/
441	VMMR3DECL(int) GIMR3GetDebugSetup(PVM pVM, PGIMDEBUGSETUP pDbgSetup)
442	{
443	AssertReturn(pVM, VERR_INVALID_PARAMETER);
444	AssertReturn(pDbgSetup, VERR_INVALID_PARAMETER);
445
446	switch (pVM->gim.s.enmProviderId)
447	{
448	case GIMPROVIDERID_HYPERV:
449	return gimR3HvGetDebugSetup(pVM, pDbgSetup);
450	default:
451	break;
452	}
453	return VERR_GIM_NO_DEBUG_CONNECTION;
454	}
455
456
457	/**
458	* Read data from a host debug session.
459	*
460	* @returns VBox status code.
461	*
462	* @param pVM The cross context VM structure.
463	* @param pvRead The read buffer.
464	* @param pcbRead The size of the read buffer as well as where to store
465	* the number of bytes read.
466	* @param pfnReadComplete Callback when the buffer has been read and
467	* before signalling reading of the next buffer.
468	* Optional, can be NULL.
469	* @thread EMT.
470	*/
471	VMMR3_INT_DECL(int) gimR3DebugRead(PVM pVM, void pvRead, size_t pcbRead, PFNGIMDEBUGBUFREADCOMPLETED pfnReadComplete)
472	{
473	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
474	if (pDbg)
475	{
476	if (ASMAtomicReadBool(&pDbg->fDbgRecvBufRead) == true)
477	{
478	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgRecv);
479	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgRecvBytes, pDbg->cbDbgRecvBufRead);
480
481	memcpy(pvRead, pDbg->pvDbgRecvBuf, pDbg->cbDbgRecvBufRead);
482	*pcbRead = pDbg->cbDbgRecvBufRead;
483	if (pfnReadComplete)
484	pfnReadComplete(pVM);
485	RTSemEventMultiSignal(pDbg->hDbgRecvThreadSem);
486	ASMAtomicWriteBool(&pDbg->fDbgRecvBufRead, false);
487	return VINF_SUCCESS;
488	}
489	else
490	*pcbRead = 0;
491	return VERR_NO_DATA;
492	}
493	return VERR_GIM_NO_DEBUG_CONNECTION;
494	}
495
496
497	/**
498	* Write data to a host debug session.
499	*
500	* @returns VBox status code.
501	*
502	* @param pVM The cross context VM structure.
503	* @param pvWrite The write buffer.
504	* @param pcbWrite The size of the write buffer as well as where to store
505	* the number of bytes written.
506	* @thread EMT.
507	*/
508	VMMR3_INT_DECL(int) gimR3DebugWrite(PVM pVM, void pvWrite, size_t pcbWrite)
509	{
510	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
511	if (pDbg)
512	{
513	PPDMISTREAM pDbgStream = pDbg->pDbgDrvStream;
514	if (pDbgStream)
515	{
516	size_t cbWrite = *pcbWrite;
517	int rc = pDbgStream->pfnWrite(pDbgStream, pvWrite, pcbWrite);
518	if ( RT_SUCCESS(rc)
519	&& *pcbWrite == cbWrite)
520	{
521	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgXmit);
522	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgXmitBytes, *pcbWrite);
523	}
524	return rc;
525	}
526	}
527	return VERR_GIM_NO_DEBUG_CONNECTION;
528	}
529
530	#if 0 /* ??? */
531
532	/**
533	* @callback_method_impl{FNPGMPHYSHANDLER,
534	* Write access handler for mapped MMIO2 pages. Currently ignores writes.}
535	*
536	* @todo In the future we might want to let the GIM provider decide what the
537	* handler should do (like throwing \#GP faults).
538	*/
539	static DECLCALLBACK(VBOXSTRICTRC) gimR3Mmio2WriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, void pvPhys, void pvBuf,
540	size_t cbBuf, PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin,
541	void *pvUser)
542	{
543	RT_NOREF6(pVM, pVCpu, GCPhys, pvPhys, pvBuf, cbBuf);
544	RT_NOREF3(enmAccessType, enmOrigin, pvUser);
545
546	/*
547	* Ignore writes to the mapped MMIO2 page.
548	*/
549	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
550	return VINF_SUCCESS; /** @todo Hyper-V says we should \#GP(0) fault for writes to the Hypercall and TSC page. */
551	}
552
553
554	/**
555	* Unmaps a registered MMIO2 region in the guest address space and removes any
556	* access handlers for it.
557	*
558	* @returns VBox status code.
559	* @param pVM The cross context VM structure.
560	* @param pRegion Pointer to the GIM MMIO2 region.
561	*/
562	VMMR3_INT_DECL(int) gimR3Mmio2Unmap(PVM pVM, PGIMMMIO2REGION pRegion)
563	{
564	AssertPtr(pVM);
565	AssertPtr(pRegion);
566
567	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
568	AssertPtr(pDevIns);
569	if (pRegion->fMapped)
570	{
571	int rc = PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
572	AssertRC(rc);
573
574	rc = PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, pRegion->GCPhysPage);
575	if (RT_SUCCESS(rc))
576	{
577	pRegion->fMapped = false;
578	pRegion->GCPhysPage = NIL_RTGCPHYS;
579	}
580	}
581	return VINF_SUCCESS;
582	}
583
584
585	/**
586	* Maps a registered MMIO2 region in the guest address space.
587	*
588	* The region will be made read-only and writes from the guest will be ignored.
589	*
590	* @returns VBox status code.
591	* @param pVM The cross context VM structure.
592	* @param pRegion Pointer to the GIM MMIO2 region.
593	* @param GCPhysRegion Where in the guest address space to map the region.
594	*/
595	VMMR3_INT_DECL(int) GIMR3Mmio2Map(PVM pVM, PGIMMMIO2REGION pRegion, RTGCPHYS GCPhysRegion)
596	{
597	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
598	AssertPtr(pDevIns);
599
600	/* The guest-physical address must be page-aligned. */
601	if (GCPhysRegion & PAGE_OFFSET_MASK)
602	{
603	LogFunc(("%s: %#RGp not paging aligned\n", pRegion->szDescription, GCPhysRegion));
604	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
605	}
606
607	/* Allow only normal pages to be overlaid using our MMIO2 pages (disallow MMIO, ROM, reserved pages). */
608	/** @todo Hyper-V doesn't seem to be very strict about this, may be relax
609	* later if some guest really requires it. */
610	if (!PGMPhysIsGCPhysNormal(pVM, GCPhysRegion))
611	{
612	LogFunc(("%s: %#RGp is not normal memory\n", pRegion->szDescription, GCPhysRegion));
613	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
614	}
615
616	if (!pRegion->fRegistered)
617	{
618	LogFunc(("%s: Region has not been registered.\n", pRegion->szDescription));
619	return VERR_GIM_IPE_1;
620	}
621
622	/*
623	* Map the MMIO2 region over the specified guest-physical address.
624	*/
625	int rc = PDMDevHlpMMIOExMap(pDevIns, NULL, pRegion->iRegion, GCPhysRegion);
626	if (RT_SUCCESS(rc))
627	{
628	/*
629	* Install access-handlers for the mapped page to prevent (ignore) writes to it
630	* from the guest.
631	*/
632	if (pVM->gim.s.hSemiReadOnlyMmio2Handler == NIL_PGMPHYSHANDLERTYPE)
633	rc = PGMR3HandlerPhysicalTypeRegister(pVM, PGMPHYSHANDLERKIND_WRITE,
634	gimR3Mmio2WriteHandler,
635	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NULL / pszPfHandlerR0 */,
636	NULL /* pszModRC /, NULL / pszHandlerRC /, NULL / pszPfHandlerRC */,
637	"GIM read-only MMIO2 handler",
638	&pVM->gim.s.hSemiReadOnlyMmio2Handler);
639	if (RT_SUCCESS(rc))
640	{
641	rc = PGMHandlerPhysicalRegister(pVM, GCPhysRegion, GCPhysRegion + (pRegion->cbRegion - 1),
642	pVM->gim.s.hSemiReadOnlyMmio2Handler,
643	NULL /* pvUserR3 /, NIL_RTR0PTR / pvUserR0 /, NIL_RTRCPTR / pvUserRC */,
644	pRegion->szDescription);
645	if (RT_SUCCESS(rc))
646	{
647	pRegion->fMapped = true;
648	pRegion->GCPhysPage = GCPhysRegion;
649	return rc;
650	}
651	}
652
653	PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, GCPhysRegion);
654	}
655
656	return rc;
657	}
658
659
660	/**
661	* Registers the physical handler for the registered and mapped MMIO2 region.
662	*
663	* @returns VBox status code.
664	* @param pVM The cross context VM structure.
665	* @param pRegion Pointer to the GIM MMIO2 region.
666	*/
667	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalRegister(PVM pVM, PGIMMMIO2REGION pRegion)
668	{
669	AssertPtr(pRegion);
670	AssertReturn(pRegion->fRegistered, VERR_GIM_IPE_2);
671	AssertReturn(pRegion->fMapped, VERR_GIM_IPE_3);
672
673	return PGMR3HandlerPhysicalRegister(pVM,
674	PGMPHYSHANDLERKIND_WRITE,
675	pRegion->GCPhysPage, pRegion->GCPhysPage + (pRegion->cbRegion - 1),
676	gimR3Mmio2WriteHandler, NULL /* pvUserR3 */,
677	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NIL_RTR0PTR / pvUserR0 */,
678	NULL /* pszModRC /, NULL / pszHandlerRC /, NIL_RTRCPTR / pvUserRC */,
679	pRegion->szDescription);
680	}
681
682
683	/**
684	* Deregisters the physical handler for the MMIO2 region.
685	*
686	* @returns VBox status code.
687	* @param pVM The cross context VM structure.
688	* @param pRegion Pointer to the GIM MMIO2 region.
689	*/
690	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalDeregister(PVM pVM, PGIMMMIO2REGION pRegion)
691	{
692	return PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
693	}
694
695	#endif
696

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source: vbox/trunk/src/VBox/VMM/VMMR3/GIM.cpp@ 93444

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