GIM.cpp@ 106952

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1	/* $Id: GIM.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* GIM - Guest Interface Manager.
4	*/
5
6	/*
7	* Copyright (C) 2014-2024 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	#if !defined(VBOX_VMM_TARGET_ARMV8)
77	/* Include all GIM providers. */
78	# include "GIMMinimalInternal.h"
79	# include "GIMHvInternal.h"
80	# include "GIMKvmInternal.h"
81	#endif
82
83
84	/*********************************************************************************************************************************
85	* Internal Functions *
86	*********************************************************************************************************************************/
87	static FNSSMINTSAVEEXEC gimR3Save;
88	static FNSSMINTLOADEXEC gimR3Load;
89	static FNSSMINTLOADDONE gimR3LoadDone;
90
91
92	/**
93	* Initializes the GIM.
94	*
95	* @returns VBox status code.
96	* @param pVM The cross context VM structure.
97	*/
98	VMMR3_INT_DECL(int) GIMR3Init(PVM pVM)
99	{
100	LogFlow(("GIMR3Init\n"));
101
102	/*
103	* Assert alignment and sizes.
104	*/
105	AssertCompile(sizeof(pVM->gim.s) <= sizeof(pVM->gim.padding));
106	AssertCompile(sizeof(pVM->apCpusR3[0]->gim.s) <= sizeof(pVM->apCpusR3[0]->gim.padding));
107
108	/*
109	* Initialize members.
110	*/
111	pVM->gim.s.hSemiReadOnlyMmio2Handler = NIL_PGMPHYSHANDLERTYPE;
112
113	/*
114	* Register the saved state data unit.
115	*/
116	int rc = SSMR3RegisterInternal(pVM, "GIM", 0 /* uInstance */, GIM_SAVED_STATE_VERSION, sizeof(GIM),
117	NULL /* pfnLivePrep /, NULL / pfnLiveExec /, NULL / pfnLiveVote*/,
118	NULL /* pfnSavePrep /, gimR3Save, NULL / pfnSaveDone */,
119	NULL /* pfnLoadPrep */, gimR3Load, gimR3LoadDone);
120	if (RT_FAILURE(rc))
121	return rc;
122
123	/*
124	* Read configuration.
125	*/
126	PCFGMNODE pCfgNode = CFGMR3GetChild(CFGMR3GetRoot(pVM), "GIM/");
127
128	/*
129	* Validate the GIM settings.
130	*/
131	rc = CFGMR3ValidateConfig(pCfgNode, "/GIM/", /* pszNode */
132	"Provider" /* pszValidValues */
133	"\|Version",
134	"HyperV", /* pszValidNodes */
135	"GIM", /* pszWho */
136	0); /* uInstance */
137	if (RT_FAILURE(rc))
138	return rc;
139
140	/** @cfgm{/GIM/Provider, string}
141	* The name of the GIM provider. The default is "none". */
142	char szProvider[64];
143	rc = CFGMR3QueryStringDef(pCfgNode, "Provider", szProvider, sizeof(szProvider), "None");
144	AssertLogRelRCReturn(rc, rc);
145
146	/** @cfgm{/GIM/Version, uint32_t}
147	* The interface version. The default is 0, which means "provide the most
148	* up-to-date implementation". */
149	uint32_t uVersion;
150	rc = CFGMR3QueryU32Def(pCfgNode, "Version", &uVersion, 0 /* default */);
151	AssertLogRelRCReturn(rc, rc);
152
153	/*
154	* Setup the GIM provider for this VM.
155	*/
156	LogRel(("GIM: Using provider '%s' (Implementation version: %u)\n", szProvider, uVersion));
157	if (!RTStrCmp(szProvider, "None"))
158	pVM->gim.s.enmProviderId = GIMPROVIDERID_NONE;
159	else
160	{
161	pVM->gim.s.u32Version = uVersion;
162	/** @todo r=bird: Because u32Version is saved, it should be translated to the
163	* 'most up-to-date implementation' version number when 0. Otherwise,
164	* we'll have abiguities when loading the state of older VMs. */
165	#if !defined(VBOX_VMM_TARGET_ARMV8)
166	if (!RTStrCmp(szProvider, "Minimal"))
167	{
168	pVM->gim.s.enmProviderId = GIMPROVIDERID_MINIMAL;
169	rc = gimR3MinimalInit(pVM);
170	}
171	else if (!RTStrCmp(szProvider, "HyperV"))
172	{
173	pVM->gim.s.enmProviderId = GIMPROVIDERID_HYPERV;
174	rc = gimR3HvInit(pVM, pCfgNode);
175	}
176	else if (!RTStrCmp(szProvider, "KVM"))
177	{
178	pVM->gim.s.enmProviderId = GIMPROVIDERID_KVM;
179	rc = gimR3KvmInit(pVM);
180	}
181	else
182	#endif
183	rc = VMR3SetError(pVM->pUVM, VERR_GIM_INVALID_PROVIDER, RT_SRC_POS, "Provider '%s' unknown.", szProvider);
184	}
185
186	/*
187	* Statistics.
188	*/
189	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmit, STAMTYPE_COUNTER, "/GIM/Debug/Transmit", STAMUNIT_OCCURENCES, "Debug packets sent.");
190	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgXmitBytes, STAMTYPE_COUNTER, "/GIM/Debug/TransmitBytes", STAMUNIT_OCCURENCES, "Debug bytes sent.");
191	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecv, STAMTYPE_COUNTER, "/GIM/Debug/Receive", STAMUNIT_OCCURENCES, "Debug packets received.");
192	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatDbgRecvBytes, STAMTYPE_COUNTER, "/GIM/Debug/ReceiveBytes", STAMUNIT_OCCURENCES, "Debug bytes received.");
193
194	STAM_REL_REG_USED(pVM, &pVM->gim.s.StatHypercalls, STAMTYPE_COUNTER, "/GIM/Hypercalls", STAMUNIT_OCCURENCES, "Number of hypercalls initiated.");
195	return rc;
196	}
197
198
199	/**
200	* Initializes the remaining bits of the GIM provider.
201	*
202	* This is called after initializing HM and most other VMM components.
203	*
204	* @returns VBox status code.
205	* @param pVM The cross context VM structure.
206	* @thread EMT(0)
207	*/
208	VMMR3_INT_DECL(int) GIMR3InitCompleted(PVM pVM)
209	{
210	switch (pVM->gim.s.enmProviderId)
211	{
212	#if !defined(VBOX_VMM_TARGET_ARMV8)
213	case GIMPROVIDERID_MINIMAL:
214	return gimR3MinimalInitCompleted(pVM);
215
216	case GIMPROVIDERID_HYPERV:
217	return gimR3HvInitCompleted(pVM);
218
219	case GIMPROVIDERID_KVM:
220	return gimR3KvmInitCompleted(pVM);
221	#endif
222	default:
223	break;
224	}
225
226	if (!TMR3CpuTickIsFixedRateMonotonic(pVM, true /* fWithParavirtEnabled */))
227	LogRel(("GIM: Warning!!! Host TSC is unstable. The guest may behave unpredictably with a paravirtualized clock.\n"));
228
229	return VINF_SUCCESS;
230	}
231
232
233	/**
234	* @callback_method_impl{FNSSMINTSAVEEXEC}
235	*/
236	static DECLCALLBACK(int) gimR3Save(PVM pVM, PSSMHANDLE pSSM)
237	{
238	AssertReturn(pVM, VERR_INVALID_PARAMETER);
239	AssertReturn(pSSM, VERR_SSM_INVALID_STATE);
240
241	int rc = VINF_SUCCESS;
242	#if 0
243	/* Save per-CPU data. */
244	SSMR3PutU32(pSSM, pVM->cCpus);
245	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
246	{
247	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
248	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
249	}
250	#endif
251
252	/*
253	* Save per-VM data.
254	*/
255	SSMR3PutU32(pSSM, pVM->gim.s.enmProviderId);
256	SSMR3PutU32(pSSM, pVM->gim.s.u32Version);
257
258	/*
259	* Save provider-specific data.
260	*/
261	switch (pVM->gim.s.enmProviderId)
262	{
263	#if !defined(VBOX_VMM_TARGET_ARMV8)
264	case GIMPROVIDERID_HYPERV:
265	rc = gimR3HvSave(pVM, pSSM);
266	AssertRCReturn(rc, rc);
267	break;
268
269	case GIMPROVIDERID_KVM:
270	rc = gimR3KvmSave(pVM, pSSM);
271	AssertRCReturn(rc, rc);
272	break;
273	#endif
274	default:
275	break;
276	}
277
278	return rc;
279	}
280
281
282	/**
283	* @callback_method_impl{FNSSMINTLOADEXEC}
284	*/
285	static DECLCALLBACK(int) gimR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
286	{
287	if (uPass != SSM_PASS_FINAL)
288	return VINF_SUCCESS;
289	if (uVersion != GIM_SAVED_STATE_VERSION)
290	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
291
292	int rc;
293	#if 0
294	/* Load per-CPU data. */
295	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
296	{
297	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
298	rc = SSMR3PutXYZ(pSSM, pVCpu->gim.s.XYZ);
299	}
300	#endif
301
302	/*
303	* Load per-VM data.
304	*/
305	uint32_t uProviderId;
306	uint32_t uProviderVersion;
307
308	SSMR3GetU32(pSSM, &uProviderId);
309	rc = SSMR3GetU32(pSSM, &uProviderVersion);
310	AssertRCReturn(rc, rc);
311
312	if ((GIMPROVIDERID)uProviderId != pVM->gim.s.enmProviderId)
313	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider %u differs from the configured one (%u)."),
314	uProviderId, pVM->gim.s.enmProviderId);
315	#if 0 /** @todo r=bird: Figure out what you mean to do here with the version. */
316	if (uProviderVersion != pVM->gim.s.u32Version)
317	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Saved GIM provider version %u differs from the configured one (%u)."),
318	uProviderVersion, pVM->gim.s.u32Version);
319	#else
320	pVM->gim.s.u32Version = uProviderVersion;
321	#endif
322
323	/*
324	* Load provider-specific data.
325	*/
326	switch (pVM->gim.s.enmProviderId)
327	{
328	#if !defined(VBOX_VMM_TARGET_ARMV8)
329	case GIMPROVIDERID_HYPERV:
330	rc = gimR3HvLoad(pVM, pSSM);
331	AssertRCReturn(rc, rc);
332	break;
333
334	case GIMPROVIDERID_KVM:
335	rc = gimR3KvmLoad(pVM, pSSM);
336	AssertRCReturn(rc, rc);
337	break;
338	#endif
339	default:
340	break;
341	}
342
343	return VINF_SUCCESS;
344	}
345
346
347	/**
348	* @callback_method_impl{FNSSMINTLOADDONE}
349	*/
350	static DECLCALLBACK(int) gimR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
351	{
352	#if defined(VBOX_VMM_TARGET_ARMV8)
353	RT_NOREF(pSSM);
354	#endif
355
356	switch (pVM->gim.s.enmProviderId)
357	{
358	#if !defined(VBOX_VMM_TARGET_ARMV8)
359	case GIMPROVIDERID_HYPERV:
360	return gimR3HvLoadDone(pVM, pSSM);
361	#endif
362	default:
363	return VINF_SUCCESS;
364	}
365	}
366
367
368	/**
369	* Terminates the GIM.
370	*
371	* Termination means cleaning up and freeing all resources,
372	* the VM itself is, at this point, powered off or suspended.
373	*
374	* @returns VBox status code.
375	* @param pVM The cross context VM structure.
376	*/
377	VMMR3_INT_DECL(int) GIMR3Term(PVM pVM)
378	{
379	switch (pVM->gim.s.enmProviderId)
380	{
381	#if !defined(VBOX_VMM_TARGET_ARMV8)
382	case GIMPROVIDERID_HYPERV:
383	return gimR3HvTerm(pVM);
384
385	case GIMPROVIDERID_KVM:
386	return gimR3KvmTerm(pVM);
387	#endif
388	default:
389	break;
390	}
391	return VINF_SUCCESS;
392	}
393
394
395	/**
396	* Applies relocations to data and code managed by this
397	* component. This function will be called at init and
398	* whenever the VMM need to relocate it self inside the GC.
399	*
400	* @param pVM The cross context VM structure.
401	* @param offDelta Relocation delta relative to old location.
402	*/
403	VMMR3_INT_DECL(void) GIMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
404	{
405	#if defined(VBOX_VMM_TARGET_ARMV8)
406	RT_NOREF(offDelta);
407	#endif
408
409	switch (pVM->gim.s.enmProviderId)
410	{
411	#if !defined(VBOX_VMM_TARGET_ARMV8)
412	case GIMPROVIDERID_HYPERV:
413	gimR3HvRelocate(pVM, offDelta);
414	break;
415	#endif
416	default:
417	break;
418	}
419	}
420
421
422	/**
423	* The VM is being reset.
424	*
425	* For the GIM component this means unmapping and unregistering MMIO2 regions
426	* and other provider-specific resets.
427	*
428	* @param pVM The cross context VM structure.
429	*/
430	VMMR3_INT_DECL(void) GIMR3Reset(PVM pVM)
431	{
432	switch (pVM->gim.s.enmProviderId)
433	{
434	#if !defined(VBOX_VMM_TARGET_ARMV8)
435	case GIMPROVIDERID_HYPERV:
436	return gimR3HvReset(pVM);
437
438	case GIMPROVIDERID_KVM:
439	return gimR3KvmReset(pVM);
440	#endif
441	default:
442	break;
443	}
444	}
445
446
447	/**
448	* Registers the GIM device with VMM.
449	*
450	* @param pVM The cross context VM structure.
451	* @param pDevIns Pointer to the GIM device instance.
452	* @param pDbg Pointer to the GIM device debug structure, can be
453	* NULL.
454	*/
455	VMMR3DECL(void) GIMR3GimDeviceRegister(PVM pVM, PPDMDEVINS pDevIns, PGIMDEBUG pDbg)
456	{
457	pVM->gim.s.pDevInsR3 = pDevIns;
458	pVM->gim.s.pDbgR3 = pDbg;
459	}
460
461
462	/**
463	* Gets debug setup specified by the provider.
464	*
465	* @returns VBox status code.
466	* @param pVM The cross context VM structure.
467	* @param pDbgSetup Where to store the debug setup details.
468	*/
469	VMMR3DECL(int) GIMR3GetDebugSetup(PVM pVM, PGIMDEBUGSETUP pDbgSetup)
470	{
471	AssertReturn(pVM, VERR_INVALID_PARAMETER);
472	AssertReturn(pDbgSetup, VERR_INVALID_PARAMETER);
473
474	switch (pVM->gim.s.enmProviderId)
475	{
476	#if !defined(VBOX_VMM_TARGET_ARMV8)
477	case GIMPROVIDERID_HYPERV:
478	return gimR3HvGetDebugSetup(pVM, pDbgSetup);
479	#endif
480	default:
481	break;
482	}
483	return VERR_GIM_NO_DEBUG_CONNECTION;
484	}
485
486
487	/**
488	* Read data from a host debug session.
489	*
490	* @returns VBox status code.
491	*
492	* @param pVM The cross context VM structure.
493	* @param pvRead The read buffer.
494	* @param pcbRead The size of the read buffer as well as where to store
495	* the number of bytes read.
496	* @param pfnReadComplete Callback when the buffer has been read and
497	* before signalling reading of the next buffer.
498	* Optional, can be NULL.
499	* @thread EMT.
500	*/
501	VMMR3_INT_DECL(int) gimR3DebugRead(PVM pVM, void pvRead, size_t pcbRead, PFNGIMDEBUGBUFREADCOMPLETED pfnReadComplete)
502	{
503	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
504	if (pDbg)
505	{
506	if (ASMAtomicReadBool(&pDbg->fDbgRecvBufRead) == true)
507	{
508	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgRecv);
509	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgRecvBytes, pDbg->cbDbgRecvBufRead);
510
511	memcpy(pvRead, pDbg->pvDbgRecvBuf, pDbg->cbDbgRecvBufRead);
512	*pcbRead = pDbg->cbDbgRecvBufRead;
513	if (pfnReadComplete)
514	pfnReadComplete(pVM);
515	RTSemEventMultiSignal(pDbg->hDbgRecvThreadSem);
516	ASMAtomicWriteBool(&pDbg->fDbgRecvBufRead, false);
517	return VINF_SUCCESS;
518	}
519	else
520	*pcbRead = 0;
521	return VERR_NO_DATA;
522	}
523	return VERR_GIM_NO_DEBUG_CONNECTION;
524	}
525
526
527	/**
528	* Write data to a host debug session.
529	*
530	* @returns VBox status code.
531	*
532	* @param pVM The cross context VM structure.
533	* @param pvWrite The write buffer.
534	* @param pcbWrite The size of the write buffer as well as where to store
535	* the number of bytes written.
536	* @thread EMT.
537	*/
538	VMMR3_INT_DECL(int) gimR3DebugWrite(PVM pVM, void pvWrite, size_t pcbWrite)
539	{
540	PGIMDEBUG pDbg = pVM->gim.s.pDbgR3;
541	if (pDbg)
542	{
543	PPDMISTREAM pDbgStream = pDbg->pDbgDrvStream;
544	if (pDbgStream)
545	{
546	size_t cbWrite = *pcbWrite;
547	int rc = pDbgStream->pfnWrite(pDbgStream, pvWrite, pcbWrite);
548	if ( RT_SUCCESS(rc)
549	&& *pcbWrite == cbWrite)
550	{
551	STAM_REL_COUNTER_INC(&pVM->gim.s.StatDbgXmit);
552	STAM_REL_COUNTER_ADD(&pVM->gim.s.StatDbgXmitBytes, *pcbWrite);
553	}
554	return rc;
555	}
556	}
557	return VERR_GIM_NO_DEBUG_CONNECTION;
558	}
559
560	#if 0 /* ??? */
561
562	/**
563	* @callback_method_impl{FNPGMPHYSHANDLER,
564	* Write access handler for mapped MMIO2 pages. Currently ignores writes.}
565	*
566	* @todo In the future we might want to let the GIM provider decide what the
567	* handler should do (like throwing \#GP faults).
568	*/
569	static DECLCALLBACK(VBOXSTRICTRC) gimR3Mmio2WriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPHYS GCPhys, void pvPhys, void pvBuf,
570	size_t cbBuf, PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin,
571	void *pvUser)
572	{
573	RT_NOREF6(pVM, pVCpu, GCPhys, pvPhys, pvBuf, cbBuf);
574	RT_NOREF3(enmAccessType, enmOrigin, pvUser);
575
576	/*
577	* Ignore writes to the mapped MMIO2 page.
578	*/
579	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
580	return VINF_SUCCESS; /** @todo Hyper-V says we should \#GP(0) fault for writes to the Hypercall and TSC page. */
581	}
582
583
584	/**
585	* Unmaps a registered MMIO2 region in the guest address space and removes any
586	* access handlers for it.
587	*
588	* @returns VBox status code.
589	* @param pVM The cross context VM structure.
590	* @param pRegion Pointer to the GIM MMIO2 region.
591	*/
592	VMMR3_INT_DECL(int) gimR3Mmio2Unmap(PVM pVM, PGIMMMIO2REGION pRegion)
593	{
594	AssertPtr(pVM);
595	AssertPtr(pRegion);
596
597	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
598	AssertPtr(pDevIns);
599	if (pRegion->fMapped)
600	{
601	int rc = PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
602	AssertRC(rc);
603
604	rc = PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, pRegion->GCPhysPage);
605	if (RT_SUCCESS(rc))
606	{
607	pRegion->fMapped = false;
608	pRegion->GCPhysPage = NIL_RTGCPHYS;
609	}
610	}
611	return VINF_SUCCESS;
612	}
613
614
615	/**
616	* Maps a registered MMIO2 region in the guest address space.
617	*
618	* The region will be made read-only and writes from the guest will be ignored.
619	*
620	* @returns VBox status code.
621	* @param pVM The cross context VM structure.
622	* @param pRegion Pointer to the GIM MMIO2 region.
623	* @param GCPhysRegion Where in the guest address space to map the region.
624	*/
625	VMMR3_INT_DECL(int) GIMR3Mmio2Map(PVM pVM, PGIMMMIO2REGION pRegion, RTGCPHYS GCPhysRegion)
626	{
627	PPDMDEVINS pDevIns = pVM->gim.s.pDevInsR3;
628	AssertPtr(pDevIns);
629
630	/* The guest-physical address must be page-aligned. */
631	if (GCPhysRegion & GUEST_PAGE_OFFSET_MASK)
632	{
633	LogFunc(("%s: %#RGp not paging aligned\n", pRegion->szDescription, GCPhysRegion));
634	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
635	}
636
637	/* Allow only normal pages to be overlaid using our MMIO2 pages (disallow MMIO, ROM, reserved pages). */
638	/** @todo Hyper-V doesn't seem to be very strict about this, may be relax
639	* later if some guest really requires it. */
640	if (!PGMPhysIsGCPhysNormal(pVM, GCPhysRegion))
641	{
642	LogFunc(("%s: %#RGp is not normal memory\n", pRegion->szDescription, GCPhysRegion));
643	return VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
644	}
645
646	if (!pRegion->fRegistered)
647	{
648	LogFunc(("%s: Region has not been registered.\n", pRegion->szDescription));
649	return VERR_GIM_IPE_1;
650	}
651
652	/*
653	* Map the MMIO2 region over the specified guest-physical address.
654	*/
655	int rc = PDMDevHlpMMIOExMap(pDevIns, NULL, pRegion->iRegion, GCPhysRegion);
656	if (RT_SUCCESS(rc))
657	{
658	/*
659	* Install access-handlers for the mapped page to prevent (ignore) writes to it
660	* from the guest.
661	*/
662	if (pVM->gim.s.hSemiReadOnlyMmio2Handler == NIL_PGMPHYSHANDLERTYPE)
663	rc = PGMR3HandlerPhysicalTypeRegister(pVM, PGMPHYSHANDLERKIND_WRITE,
664	gimR3Mmio2WriteHandler,
665	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NULL / pszPfHandlerR0 */,
666	NULL /* pszModRC /, NULL / pszHandlerRC /, NULL / pszPfHandlerRC */,
667	"GIM read-only MMIO2 handler",
668	&pVM->gim.s.hSemiReadOnlyMmio2Handler);
669	if (RT_SUCCESS(rc))
670	{
671	rc = PGMHandlerPhysicalRegister(pVM, GCPhysRegion, GCPhysRegion + (pRegion->cbRegion - 1),
672	pVM->gim.s.hSemiReadOnlyMmio2Handler,
673	NULL /* pvUserR3 /, NIL_RTR0PTR / pvUserR0 /, NIL_RTRCPTR / pvUserRC */,
674	pRegion->szDescription);
675	if (RT_SUCCESS(rc))
676	{
677	pRegion->fMapped = true;
678	pRegion->GCPhysPage = GCPhysRegion;
679	return rc;
680	}
681	}
682
683	PDMDevHlpMMIO2Unmap(pDevIns, pRegion->iRegion, GCPhysRegion);
684	}
685
686	return rc;
687	}
688
689
690	/**
691	* Registers the physical handler for the registered and mapped MMIO2 region.
692	*
693	* @returns VBox status code.
694	* @param pVM The cross context VM structure.
695	* @param pRegion Pointer to the GIM MMIO2 region.
696	*/
697	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalRegister(PVM pVM, PGIMMMIO2REGION pRegion)
698	{
699	AssertPtr(pRegion);
700	AssertReturn(pRegion->fRegistered, VERR_GIM_IPE_2);
701	AssertReturn(pRegion->fMapped, VERR_GIM_IPE_3);
702
703	return PGMR3HandlerPhysicalRegister(pVM,
704	PGMPHYSHANDLERKIND_WRITE,
705	pRegion->GCPhysPage, pRegion->GCPhysPage + (pRegion->cbRegion - 1),
706	gimR3Mmio2WriteHandler, NULL /* pvUserR3 */,
707	NULL /* pszModR0 /, NULL / pszHandlerR0 /, NIL_RTR0PTR / pvUserR0 */,
708	NULL /* pszModRC /, NULL / pszHandlerRC /, NIL_RTRCPTR / pvUserRC */,
709	pRegion->szDescription);
710	}
711
712
713	/**
714	* Deregisters the physical handler for the MMIO2 region.
715	*
716	* @returns VBox status code.
717	* @param pVM The cross context VM structure.
718	* @param pRegion Pointer to the GIM MMIO2 region.
719	*/
720	VMMR3_INT_DECL(int) gimR3Mmio2HandlerPhysicalDeregister(PVM pVM, PGIMMMIO2REGION pRegion)
721	{
722	return PGMHandlerPhysicalDeregister(pVM, pRegion->GCPhysPage);
723	}
724
725	#endif
726

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source: vbox/trunk/src/VBox/VMM/VMMR3/GIM.cpp@ 106952

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