VMMDevHGCM.cpp@ 102788

Last change on this file since 102788 was 100185, checked in by vboxsync, 17 months ago
Devices/VMMDev: Add an MMIO interface in addition to the existing PIO interface for guest additions running inside an ARM based guest. Also remove the dependency from the architecture page size and introduce a 4KiB VMM page size as ARM has different page sizes (4KiB, 16KiB, 64KiB) and it can differ between host and guest, bugref:10456
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 114.1 KB

Line
1	/* $Id: VMMDevHGCM.cpp 100185 2023-06-16 06:54:50Z vboxsync $ */
2	/** @file
3	* VMMDev - HGCM - Host-Guest Communication Manager Device.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 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
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_DEV_VMM
33	#include <iprt/alloc.h>
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/param.h>
37	#include <iprt/string.h>
38
39	#include <VBox/AssertGuest.h>
40	#include <VBox/err.h>
41	#include <VBox/hgcmsvc.h>
42	#include <VBox/log.h>
43
44	#include "VMMDevHGCM.h"
45
46	#ifdef DEBUG
47	# define VBOX_STRICT_GUEST
48	#endif
49
50	#ifdef VBOX_WITH_DTRACE
51	# include "dtrace/VBoxDD.h"
52	#else
53	# define VBOXDD_HGCMCALL_ENTER(a,b,c,d) do { } while (0)
54	# define VBOXDD_HGCMCALL_COMPLETED_REQ(a,b) do { } while (0)
55	# define VBOXDD_HGCMCALL_COMPLETED_EMT(a,b) do { } while (0)
56	# define VBOXDD_HGCMCALL_COMPLETED_DONE(a,b,c,d) do { } while (0)
57	#endif
58
59
60	/*********************************************************************************************************************************
61	* Structures and Typedefs *
62	*********************************************************************************************************************************/
63	typedef enum VBOXHGCMCMDTYPE
64	{
65	VBOXHGCMCMDTYPE_LOADSTATE = 0,
66	VBOXHGCMCMDTYPE_CONNECT,
67	VBOXHGCMCMDTYPE_DISCONNECT,
68	VBOXHGCMCMDTYPE_CALL,
69	VBOXHGCMCMDTYPE_SizeHack = 0x7fffffff
70	} VBOXHGCMCMDTYPE;
71
72	/**
73	* Information about a 32 or 64 bit parameter.
74	*/
75	typedef struct VBOXHGCMPARMVAL
76	{
77	/** Actual value. Both 32 and 64 bit is saved here. */
78	uint64_t u64Value;
79
80	/** Offset from the start of the request where the value is stored. */
81	uint32_t offValue;
82
83	/** Size of the value: 4 for 32 bit and 8 for 64 bit. */
84	uint32_t cbValue;
85
86	} VBOXHGCMPARMVAL;
87
88	/**
89	* Information about a pointer parameter.
90	*/
91	typedef struct VBOXHGCMPARMPTR
92	{
93	/** Size of the buffer described by the pointer parameter. */
94	uint32_t cbData;
95
96	/** @todo save 8 bytes here by putting offFirstPage, cPages, and f32Direction
97	* into a bitfields like in VBOXHGCMPARMPAGES. */
98	/** Offset in the first physical page of the region. */
99	uint32_t offFirstPage;
100
101	/** How many pages. */
102	uint32_t cPages;
103
104	/** How the buffer should be copied VBOX_HGCM_F_PARM_. /
105	uint32_t fu32Direction;
106
107	/** Pointer to array of the GC physical addresses for these pages.
108	* It is assumed that the physical address of the locked resident guest page
109	* does not change. */
110	RTGCPHYS *paPages;
111
112	/** For single page requests. */
113	RTGCPHYS GCPhysSinglePage;
114
115	} VBOXHGCMPARMPTR;
116
117
118	/**
119	* Pages w/o bounce buffering.
120	*/
121	typedef struct VBOXHGCMPARMPAGES
122	{
123	/** The buffer size. */
124	uint32_t cbData;
125	/** Start of buffer offset into the first page. */
126	uint32_t offFirstPage : 12;
127	/** VBOX_HGCM_F_PARM_XXX flags. */
128	uint32_t fFlags : 3;
129	/** Set if we've locked all the pages. */
130	uint32_t fLocked : 1;
131	/** Number of pages. */
132	uint32_t cPages : 16;
133	/**< Array of page locks followed by array of page pointers, the first page
134	* pointer is adjusted by offFirstPage. */
135	PPGMPAGEMAPLOCK paPgLocks;
136	} VBOXHGCMPARMPAGES;
137
138	/**
139	* Information about a guest HGCM parameter.
140	*/
141	typedef struct VBOXHGCMGUESTPARM
142	{
143	/** The parameter type. */
144	HGCMFunctionParameterType enmType;
145
146	union
147	{
148	VBOXHGCMPARMVAL val;
149	VBOXHGCMPARMPTR ptr;
150	VBOXHGCMPARMPAGES Pages;
151	} u;
152
153	} VBOXHGCMGUESTPARM;
154
155	typedef struct VBOXHGCMCMD
156	{
157	/** Active commands, list is protected by critsectHGCMCmdList. */
158	RTLISTNODE node;
159
160	/** The type of the command (VBOXHGCMCMDTYPE). */
161	uint8_t enmCmdType;
162
163	/** Whether the command was cancelled by the guest. */
164	bool fCancelled;
165
166	/** Set if allocated from the memory cache, clear if heap. */
167	bool fMemCache;
168
169	/** Whether the command was restored from saved state. */
170	bool fRestored : 1;
171	/** Whether this command has a no-bounce page list and needs to be restored
172	* from guest memory the old fashioned way. */
173	bool fRestoreFromGuestMem : 1;
174
175	/** Copy of VMMDevRequestHeader::fRequestor.
176	* @note Only valid if VBOXGSTINFO2_F_REQUESTOR_INFO is set in
177	* VMMDevState.guestInfo2.fFeatures. */
178	uint32_t fRequestor;
179
180	/** GC physical address of the guest request. */
181	RTGCPHYS GCPhys;
182
183	/** Request packet size. */
184	uint32_t cbRequest;
185
186	/** The type of the guest request. */
187	VMMDevRequestType enmRequestType;
188
189	/** Pointer to the locked request, NULL if not locked. */
190	void *pvReqLocked;
191	/** The PGM lock for GCPhys if pvReqLocked is not NULL. */
192	PGMPAGEMAPLOCK ReqMapLock;
193
194	/** The accounting index (into VMMDEVR3::aHgcmAcc). */
195	uint8_t idxHeapAcc;
196	uint8_t abPadding[3];
197	/** The heap cost of this command. */
198	uint32_t cbHeapCost;
199
200	/** The STAM_GET_TS() value when the request arrived. */
201	uint64_t tsArrival;
202	/** The STAM_GET_TS() value when the hgcmR3Completed() is called. */
203	uint64_t tsComplete;
204
205	union
206	{
207	struct
208	{
209	uint32_t u32ClientID;
210	HGCMServiceLocation pLoc; /< Allocated after this structure. /
211	} connect;
212
213	struct
214	{
215	uint32_t u32ClientID;
216	} disconnect;
217
218	struct
219	{
220	/* Number of elements in paGuestParms and paHostParms arrays. */
221	uint32_t cParms;
222
223	uint32_t u32ClientID;
224
225	uint32_t u32Function;
226
227	/** Pointer to information about guest parameters in case of a Call request.
228	* Follows this structure in the same memory block.
229	*/
230	VBOXHGCMGUESTPARM *paGuestParms;
231
232	/** Pointer to converted host parameters in case of a Call request.
233	* Follows this structure in the same memory block.
234	*/
235	VBOXHGCMSVCPARM *paHostParms;
236
237	/* VBOXHGCMGUESTPARM[] */
238	/* VBOXHGCMSVCPARM[] */
239	} call;
240	} u;
241	} VBOXHGCMCMD;
242
243
244	/**
245	* Version for the memory cache.
246	*/
247	typedef struct VBOXHGCMCMDCACHED
248	{
249	VBOXHGCMCMD Core; /*< 120 /
250	VBOXHGCMGUESTPARM aGuestParms[6]; /*< 40 6 = 240 */
251	VBOXHGCMSVCPARM aHostParms[6]; /*< 24 6 = 144 */
252	} VBOXHGCMCMDCACHED; /*< 120+240+144 = 504 /
253	AssertCompile(sizeof(VBOXHGCMCMD) <= 120);
254	AssertCompile(sizeof(VBOXHGCMGUESTPARM) <= 40);
255	AssertCompile(sizeof(VBOXHGCMSVCPARM) <= 24);
256	AssertCompile(sizeof(VBOXHGCMCMDCACHED) <= 512);
257	AssertCompile(sizeof(VBOXHGCMCMDCACHED) > sizeof(VBOXHGCMCMD) + sizeof(HGCMServiceLocation));
258
259
260	/*********************************************************************************************************************************
261	* Internal Functions *
262	*********************************************************************************************************************************/
263	DECLINLINE(void *) vmmdevR3HgcmCallMemAllocZ(PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd, size_t cbRequested);
264
265
266
267	DECLINLINE(int) vmmdevR3HgcmCmdListLock(PVMMDEVCC pThisCC)
268	{
269	int rc = RTCritSectEnter(&pThisCC->critsectHGCMCmdList);
270	AssertRC(rc);
271	return rc;
272	}
273
274	DECLINLINE(void) vmmdevR3HgcmCmdListUnlock(PVMMDEVCC pThisCC)
275	{
276	int rc = RTCritSectLeave(&pThisCC->critsectHGCMCmdList);
277	AssertRC(rc);
278	}
279
280	/** Allocate and initialize VBOXHGCMCMD structure for HGCM request.
281	*
282	* @returns Pointer to the command on success, NULL otherwise.
283	* @param pThisCC The VMMDev ring-3 instance data.
284	* @param enmCmdType Type of the command.
285	* @param GCPhys The guest physical address of the HGCM request.
286	* @param cbRequest The size of the HGCM request.
287	* @param cParms Number of HGCM parameters for VBOXHGCMCMDTYPE_CALL command.
288	* @param fRequestor The VMMDevRequestHeader::fRequestor value.
289	*/
290	static PVBOXHGCMCMD vmmdevR3HgcmCmdAlloc(PVMMDEVCC pThisCC, VBOXHGCMCMDTYPE enmCmdType, RTGCPHYS GCPhys,
291	uint32_t cbRequest, uint32_t cParms, uint32_t fRequestor)
292	{
293	/*
294	* Pick the heap accounting category.
295	*
296	* Initial idea was to just use what VMMDEV_REQUESTOR_USR_MASK yields directly,
297	* but there are so many unused categories then (DRV, RESERVED1, GUEST). Better
298	* to have fewer and more heap available in each.
299	*/
300	uintptr_t idxHeapAcc;
301	if (fRequestor != VMMDEV_REQUESTOR_LEGACY)
302	switch (fRequestor & VMMDEV_REQUESTOR_USR_MASK)
303	{
304	case VMMDEV_REQUESTOR_USR_NOT_GIVEN:
305	case VMMDEV_REQUESTOR_USR_DRV:
306	case VMMDEV_REQUESTOR_USR_DRV_OTHER:
307	idxHeapAcc = VMMDEV_HGCM_CATEGORY_KERNEL;
308	break;
309	case VMMDEV_REQUESTOR_USR_ROOT:
310	case VMMDEV_REQUESTOR_USR_SYSTEM:
311	idxHeapAcc = VMMDEV_HGCM_CATEGORY_ROOT;
312	break;
313	default:
314	AssertFailed(); RT_FALL_THRU();
315	case VMMDEV_REQUESTOR_USR_RESERVED1:
316	case VMMDEV_REQUESTOR_USR_USER:
317	case VMMDEV_REQUESTOR_USR_GUEST:
318	idxHeapAcc = VMMDEV_HGCM_CATEGORY_USER;
319	break;
320	}
321	else
322	idxHeapAcc = VMMDEV_HGCM_CATEGORY_KERNEL;
323
324	#if 1
325	/*
326	* Try use the cache.
327	*/
328	VBOXHGCMCMDCACHED *pCmdCached;
329	AssertCompile(sizeof(*pCmdCached) >= sizeof(VBOXHGCMCMD) + sizeof(HGCMServiceLocation));
330	if (cParms <= RT_ELEMENTS(pCmdCached->aGuestParms))
331	{
332	if (sizeof(*pCmdCached) <= pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget)
333	{
334	int rc = RTMemCacheAllocEx(pThisCC->hHgcmCmdCache, (void **)&pCmdCached);
335	if (RT_SUCCESS(rc))
336	{
337	RT_ZERO(*pCmdCached);
338	pCmdCached->Core.fMemCache = true;
339	pCmdCached->Core.GCPhys = GCPhys;
340	pCmdCached->Core.cbRequest = cbRequest;
341	pCmdCached->Core.enmCmdType = enmCmdType;
342	pCmdCached->Core.fRequestor = fRequestor;
343	pCmdCached->Core.idxHeapAcc = (uint8_t)idxHeapAcc;
344	pCmdCached->Core.cbHeapCost = sizeof(*pCmdCached);
345	Log5Func(("aHgcmAcc[%zu] %#RX64 -= %#zx (%p)\n",
346	idxHeapAcc, pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget, sizeof(*pCmdCached), &pCmdCached->Core));
347	pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget -= sizeof(*pCmdCached);
348
349	if (enmCmdType == VBOXHGCMCMDTYPE_CALL)
350	{
351	pCmdCached->Core.u.call.cParms = cParms;
352	pCmdCached->Core.u.call.paGuestParms = pCmdCached->aGuestParms;
353	pCmdCached->Core.u.call.paHostParms = pCmdCached->aHostParms;
354	}
355	else if (enmCmdType == VBOXHGCMCMDTYPE_CONNECT)
356	pCmdCached->Core.u.connect.pLoc = (HGCMServiceLocation *)(&pCmdCached->Core + 1);
357
358	Assert(!pCmdCached->Core.pvReqLocked);
359
360	Log3Func(("returns %p (enmCmdType=%d GCPhys=%RGp)\n", &pCmdCached->Core, enmCmdType, GCPhys));
361	return &pCmdCached->Core;
362	}
363	}
364	else
365	LogFunc(("Heap budget overrun: sizeof(*pCmdCached)=%#zx aHgcmAcc[%zu].cbHeapBudget=%#RX64 - enmCmdType=%d\n",
366	sizeof(*pCmdCached), idxHeapAcc, pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget, enmCmdType));
367	STAM_REL_COUNTER_INC(&pThisCC->aHgcmAcc[idxHeapAcc].StatBudgetOverruns);
368	return NULL;
369	}
370	STAM_REL_COUNTER_INC(&pThisCC->StatHgcmLargeCmdAllocs);
371
372	#else
373	RT_NOREF(pThisCC);
374	#endif
375
376	/* Size of required memory buffer. */
377	const uint32_t cbCmd = sizeof(VBOXHGCMCMD) + cParms * (sizeof(VBOXHGCMGUESTPARM) + sizeof(VBOXHGCMSVCPARM))
378	+ (enmCmdType == VBOXHGCMCMDTYPE_CONNECT ? sizeof(HGCMServiceLocation) : 0);
379	if (cbCmd <= pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget)
380	{
381	PVBOXHGCMCMD pCmd = (PVBOXHGCMCMD)RTMemAllocZ(cbCmd);
382	if (pCmd)
383	{
384	pCmd->enmCmdType = enmCmdType;
385	pCmd->GCPhys = GCPhys;
386	pCmd->cbRequest = cbRequest;
387	pCmd->fRequestor = fRequestor;
388	pCmd->idxHeapAcc = (uint8_t)idxHeapAcc;
389	pCmd->cbHeapCost = cbCmd;
390	Log5Func(("aHgcmAcc[%zu] %#RX64 -= %#x (%p)\n", idxHeapAcc, pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget, cbCmd, pCmd));
391	pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget -= cbCmd;
392
393	if (enmCmdType == VBOXHGCMCMDTYPE_CALL)
394	{
395	pCmd->u.call.cParms = cParms;
396	if (cParms)
397	{
398	pCmd->u.call.paGuestParms = (VBOXHGCMGUESTPARM )((uint8_t )pCmd
399	+ sizeof(struct VBOXHGCMCMD));
400	pCmd->u.call.paHostParms = (VBOXHGCMSVCPARM )((uint8_t )pCmd->u.call.paGuestParms
401	+ cParms * sizeof(VBOXHGCMGUESTPARM));
402	}
403	}
404	else if (enmCmdType == VBOXHGCMCMDTYPE_CONNECT)
405	pCmd->u.connect.pLoc = (HGCMServiceLocation *)(pCmd + 1);
406	}
407	Log3Func(("returns %p (enmCmdType=%d GCPhys=%RGp cbCmd=%#x)\n", pCmd, enmCmdType, GCPhys, cbCmd));
408	return pCmd;
409	}
410	STAM_REL_COUNTER_INC(&pThisCC->aHgcmAcc[idxHeapAcc].StatBudgetOverruns);
411	LogFunc(("Heap budget overrun: cbCmd=%#x aHgcmAcc[%zu].cbHeapBudget=%#RX64 - enmCmdType=%d\n",
412	cbCmd, idxHeapAcc, pThisCC->aHgcmAcc[idxHeapAcc].cbHeapBudget, enmCmdType));
413	return NULL;
414	}
415
416	/** Deallocate VBOXHGCMCMD memory.
417	*
418	* @param pDevIns The device instance.
419	* @param pThis The VMMDev shared instance data.
420	* @param pThisCC The VMMDev ring-3 instance data.
421	* @param pCmd Command to deallocate.
422	*/
423	static void vmmdevR3HgcmCmdFree(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd)
424	{
425	if (pCmd)
426	{
427	Assert( pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL
428	\|\| pCmd->enmCmdType == VBOXHGCMCMDTYPE_CONNECT
429	\|\| pCmd->enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT
430	\|\| pCmd->enmCmdType == VBOXHGCMCMDTYPE_LOADSTATE);
431	if (pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL)
432	{
433	uint32_t i;
434	for (i = 0; i < pCmd->u.call.cParms; ++i)
435	{
436	VBOXHGCMSVCPARM * const pHostParm = &pCmd->u.call.paHostParms[i];
437	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
438
439	if ( pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_In
440	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_Out
441	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr
442	\|\| pGuestParm->enmType == VMMDevHGCMParmType_PageList
443	\|\| pGuestParm->enmType == VMMDevHGCMParmType_ContiguousPageList)
444	{
445	Assert(pHostParm->type == VBOX_HGCM_SVC_PARM_PTR);
446	if (pGuestParm->u.ptr.paPages != &pGuestParm->u.ptr.GCPhysSinglePage)
447	RTMemFree(pGuestParm->u.ptr.paPages);
448	RTMemFreeZ(pHostParm->u.pointer.addr, pGuestParm->u.ptr.cbData);
449	}
450	else if (pGuestParm->enmType == VMMDevHGCMParmType_Embedded)
451	{
452	Assert(pHostParm->type == VBOX_HGCM_SVC_PARM_PTR);
453	RTMemFreeZ(pHostParm->u.pointer.addr, pGuestParm->u.ptr.cbData);
454	}
455	else if (pGuestParm->enmType == VMMDevHGCMParmType_NoBouncePageList)
456	{
457	Assert(pHostParm->type == VBOX_HGCM_SVC_PARM_PAGES);
458	if (pGuestParm->u.Pages.paPgLocks)
459	{
460	if (pGuestParm->u.Pages.fLocked)
461	PDMDevHlpPhysBulkReleasePageMappingLocks(pDevIns, pGuestParm->u.Pages.cPages,
462	pGuestParm->u.Pages.paPgLocks);
463	RTMemFree(pGuestParm->u.Pages.paPgLocks);
464	pGuestParm->u.Pages.paPgLocks = NULL;
465	}
466	}
467	else
468	Assert(pHostParm->type != VBOX_HGCM_SVC_PARM_PTR && pHostParm->type != VBOX_HGCM_SVC_PARM_PAGES);
469	}
470	}
471
472	if (pCmd->pvReqLocked)
473	{
474	PDMDevHlpPhysReleasePageMappingLock(pDevIns, &pCmd->ReqMapLock);
475	pCmd->pvReqLocked = NULL;
476	}
477
478	pCmd->enmCmdType = UINT8_MAX; /* poison */
479
480	/* Update heap budget. Need the critsect to do this safely. */
481	Assert(pCmd->cbHeapCost != 0);
482	uintptr_t idx = pCmd->idxHeapAcc;
483	AssertStmt(idx < RT_ELEMENTS(pThisCC->aHgcmAcc), idx %= RT_ELEMENTS(pThisCC->aHgcmAcc));
484
485	int const rcLock = PDMDevHlpCritSectEnter(pDevIns, &pThis->CritSect, VERR_IGNORED);
486	PDM_CRITSECT_RELEASE_ASSERT_RC_DEV(pDevIns, &pThis->CritSect, rcLock);
487
488	Log5Func(("aHgcmAcc[%zu] %#RX64 += %#x (%p)\n", idx, pThisCC->aHgcmAcc[idx].cbHeapBudget, pCmd->cbHeapCost, pCmd));
489	pThisCC->aHgcmAcc[idx].cbHeapBudget += pCmd->cbHeapCost;
490	AssertMsg(pThisCC->aHgcmAcc[idx].cbHeapBudget <= pThisCC->aHgcmAcc[idx].cbHeapBudgetConfig,
491	("idx=%d (%d) fRequestor=%#x pCmd=%p: %#RX64 vs %#RX64 -> %#RX64\n", idx, pCmd->idxHeapAcc, pCmd->fRequestor, pCmd,
492	pThisCC->aHgcmAcc[idx].cbHeapBudget, pThisCC->aHgcmAcc[idx].cbHeapBudgetConfig,
493	pThisCC->aHgcmAcc[idx].cbHeapBudget - pThisCC->aHgcmAcc[idx].cbHeapBudgetConfig));
494	pCmd->cbHeapCost = 0;
495
496	#if 1
497	if (pCmd->fMemCache)
498	{
499	RTMemCacheFree(pThisCC->hHgcmCmdCache, pCmd);
500	PDMDevHlpCritSectLeave(pDevIns, &pThis->CritSect); /* releasing it after just to be on the safe side. */
501	}
502	else
503	#endif
504	{
505	PDMDevHlpCritSectLeave(pDevIns, &pThis->CritSect);
506	RTMemFree(pCmd);
507	}
508	}
509	}
510
511	/** Add VBOXHGCMCMD to the list of pending commands.
512	*
513	* @returns VBox status code.
514	* @param pDevIns The device instance.
515	* @param pThis The VMMDev shared instance data.
516	* @param pThisCC The VMMDev ring-3 instance data.
517	* @param pCmd Command to add.
518	*/
519	static int vmmdevR3HgcmAddCommand(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd)
520	{
521	int rc = vmmdevR3HgcmCmdListLock(pThisCC);
522	AssertRCReturn(rc, rc);
523
524	LogFlowFunc(("%p type %d\n", pCmd, pCmd->enmCmdType));
525
526	RTListPrepend(&pThisCC->listHGCMCmd, &pCmd->node);
527
528	/* stats */
529	uintptr_t idx = pCmd->idxHeapAcc;
530	AssertStmt(idx < RT_ELEMENTS(pThisCC->aHgcmAcc), idx %= RT_ELEMENTS(pThisCC->aHgcmAcc));
531	STAM_REL_PROFILE_ADD_PERIOD(&pThisCC->aHgcmAcc[idx].StateMsgHeapUsage, pCmd->cbHeapCost);
532
533	/* Automatically enable HGCM events, if there are HGCM commands. */
534	if ( pCmd->enmCmdType == VBOXHGCMCMDTYPE_CONNECT
535	\|\| pCmd->enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT
536	\|\| pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL)
537	{
538	LogFunc(("u32HGCMEnabled = %d\n", pThisCC->u32HGCMEnabled));
539	if (ASMAtomicCmpXchgU32(&pThisCC->u32HGCMEnabled, 1, 0))
540	VMMDevCtlSetGuestFilterMask(pDevIns, pThis, pThisCC, VMMDEV_EVENT_HGCM, 0);
541	}
542
543	vmmdevR3HgcmCmdListUnlock(pThisCC);
544	return rc;
545	}
546
547	/** Remove VBOXHGCMCMD from the list of pending commands.
548	*
549	* @returns VBox status code.
550	* @param pThisCC The VMMDev ring-3 instance data.
551	* @param pCmd Command to remove.
552	*/
553	static int vmmdevR3HgcmRemoveCommand(PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd)
554	{
555	int rc = vmmdevR3HgcmCmdListLock(pThisCC);
556	AssertRCReturn(rc, rc);
557
558	LogFlowFunc(("%p\n", pCmd));
559
560	RTListNodeRemove(&pCmd->node);
561
562	vmmdevR3HgcmCmdListUnlock(pThisCC);
563	return rc;
564	}
565
566	/**
567	* Find a HGCM command by its physical address.
568	*
569	* The caller is responsible for taking the command list lock before calling
570	* this function.
571	*
572	* @returns Pointer to the command on success, NULL otherwise.
573	* @param pThisCC The VMMDev ring-3 instance data.
574	* @param GCPhys The physical address of the command we're looking for.
575	*/
576	DECLINLINE(PVBOXHGCMCMD) vmmdevR3HgcmFindCommandLocked(PVMMDEVCC pThisCC, RTGCPHYS GCPhys)
577	{
578	PVBOXHGCMCMD pCmd;
579	RTListForEach(&pThisCC->listHGCMCmd, pCmd, VBOXHGCMCMD, node)
580	{
581	if (pCmd->GCPhys == GCPhys)
582	return pCmd;
583	}
584	return NULL;
585	}
586
587	/** Copy VMMDevHGCMConnect request data from the guest to VBOXHGCMCMD command.
588	*
589	* @param pHGCMConnect The source guest request (cached in host memory).
590	* @param pCmd Destination command.
591	*/
592	static void vmmdevR3HgcmConnectFetch(const VMMDevHGCMConnect *pHGCMConnect, PVBOXHGCMCMD pCmd)
593	{
594	pCmd->enmRequestType = pHGCMConnect->header.header.requestType;
595	pCmd->u.connect.u32ClientID = pHGCMConnect->u32ClientID;
596	*pCmd->u.connect.pLoc = pHGCMConnect->loc;
597	}
598
599	/** Handle VMMDevHGCMConnect request.
600	*
601	* @param pDevIns The device instance.
602	* @param pThis The VMMDev shared instance data.
603	* @param pThisCC The VMMDev ring-3 instance data.
604	* @param pHGCMConnect The guest request (cached in host memory).
605	* @param GCPhys The physical address of the request.
606	*/
607	int vmmdevR3HgcmConnect(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC,
608	const VMMDevHGCMConnect *pHGCMConnect, RTGCPHYS GCPhys)
609	{
610	int rc;
611	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_CONNECT, GCPhys, pHGCMConnect->header.header.size, 0,
612	pHGCMConnect->header.header.fRequestor);
613	if (pCmd)
614	{
615	vmmdevR3HgcmConnectFetch(pHGCMConnect, pCmd);
616
617	/* Only allow the guest to use existing services! */
618	ASSERT_GUEST(pHGCMConnect->loc.type == VMMDevHGCMLoc_LocalHost_Existing);
619	pCmd->u.connect.pLoc->type = VMMDevHGCMLoc_LocalHost_Existing;
620
621	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
622	rc = pThisCC->pHGCMDrv->pfnConnect(pThisCC->pHGCMDrv, pCmd, pCmd->u.connect.pLoc, &pCmd->u.connect.u32ClientID);
623	if (RT_FAILURE(rc))
624	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
625	}
626	else
627	rc = VERR_NO_MEMORY;
628
629	return rc;
630	}
631
632	/** Copy VMMDevHGCMDisconnect request data from the guest to VBOXHGCMCMD command.
633	*
634	* @param pHGCMDisconnect The source guest request (cached in host memory).
635	* @param pCmd Destination command.
636	*/
637	static void vmmdevR3HgcmDisconnectFetch(const VMMDevHGCMDisconnect *pHGCMDisconnect, PVBOXHGCMCMD pCmd)
638	{
639	pCmd->enmRequestType = pHGCMDisconnect->header.header.requestType;
640	pCmd->u.disconnect.u32ClientID = pHGCMDisconnect->u32ClientID;
641	}
642
643	/** Handle VMMDevHGCMDisconnect request.
644	*
645	* @param pDevIns The device instance.
646	* @param pThis The VMMDev shared instance data.
647	* @param pThisCC The VMMDev ring-3 instance data.
648	* @param pHGCMDisconnect The guest request (cached in host memory).
649	* @param GCPhys The physical address of the request.
650	*/
651	int vmmdevR3HgcmDisconnect(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC,
652	const VMMDevHGCMDisconnect *pHGCMDisconnect, RTGCPHYS GCPhys)
653	{
654	int rc;
655	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_DISCONNECT, GCPhys, pHGCMDisconnect->header.header.size, 0,
656	pHGCMDisconnect->header.header.fRequestor);
657	if (pCmd)
658	{
659	vmmdevR3HgcmDisconnectFetch(pHGCMDisconnect, pCmd);
660
661	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
662	rc = pThisCC->pHGCMDrv->pfnDisconnect(pThisCC->pHGCMDrv, pCmd, pCmd->u.disconnect.u32ClientID);
663	if (RT_FAILURE(rc))
664	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
665	}
666	else
667	rc = VERR_NO_MEMORY;
668
669	return rc;
670	}
671
672	/** Translate LinAddr parameter type to the direction of data transfer.
673	*
674	* @returns VBOX_HGCM_F_PARM_DIRECTION_* flags.
675	* @param enmType Type of the LinAddr parameter.
676	*/
677	static uint32_t vmmdevR3HgcmParmTypeToDirection(HGCMFunctionParameterType enmType)
678	{
679	if (enmType == VMMDevHGCMParmType_LinAddr_In) return VBOX_HGCM_F_PARM_DIRECTION_TO_HOST;
680	if (enmType == VMMDevHGCMParmType_LinAddr_Out) return VBOX_HGCM_F_PARM_DIRECTION_FROM_HOST;
681	return VBOX_HGCM_F_PARM_DIRECTION_BOTH;
682	}
683
684	/** Check if list of pages in a HGCM pointer parameter corresponds to a contiguous buffer.
685	*
686	* @returns true if pages are contiguous, false otherwise.
687	* @param pPtr Information about a pointer HGCM parameter.
688	*/
689	DECLINLINE(bool) vmmdevR3HgcmGuestBufferIsContiguous(const VBOXHGCMPARMPTR *pPtr)
690	{
691	if (pPtr->cPages == 1)
692	return true;
693	RTGCPHYS64 Phys = pPtr->paPages[0] + VMMDEV_PAGE_SIZE;
694	if (Phys != pPtr->paPages[1])
695	return false;
696	if (pPtr->cPages > 2)
697	{
698	uint32_t iPage = 2;
699	do
700	{
701	Phys += VMMDEV_PAGE_SIZE;
702	if (Phys != pPtr->paPages[iPage])
703	return false;
704	++iPage;
705	} while (iPage < pPtr->cPages);
706	}
707	return true;
708	}
709
710	/** Copy data from guest memory to the host buffer.
711	*
712	* @returns VBox status code.
713	* @param pDevIns The device instance for PDMDevHlp.
714	* @param pvDst The destination host buffer.
715	* @param cbDst Size of the destination host buffer.
716	* @param pPtr Description of the source HGCM pointer parameter.
717	*/
718	static int vmmdevR3HgcmGuestBufferRead(PPDMDEVINSR3 pDevIns, void pvDst, uint32_t cbDst, const VBOXHGCMPARMPTR pPtr)
719	{
720	/*
721	* Try detect contiguous buffers.
722	*/
723	/** @todo We need a flag for indicating this. */
724	if (vmmdevR3HgcmGuestBufferIsContiguous(pPtr))
725	return PDMDevHlpPhysRead(pDevIns, pPtr->paPages[0] \| pPtr->offFirstPage, pvDst, cbDst);
726
727	/*
728	* Page by page fallback.
729	*/
730	uint8_t pu8Dst = (uint8_t )pvDst;
731	uint32_t offPage = pPtr->offFirstPage;
732	uint32_t cbRemaining = cbDst;
733
734	for (uint32_t iPage = 0; iPage < pPtr->cPages && cbRemaining > 0; ++iPage)
735	{
736	uint32_t cbToRead = VMMDEV_PAGE_SIZE - offPage;
737	if (cbToRead > cbRemaining)
738	cbToRead = cbRemaining;
739
740	/* Skip invalid pages. */
741	const RTGCPHYS GCPhys = pPtr->paPages[iPage];
742	if (GCPhys != NIL_RTGCPHYS)
743	{
744	int rc = PDMDevHlpPhysRead(pDevIns, GCPhys + offPage, pu8Dst, cbToRead);
745	AssertMsgReturn(RT_SUCCESS(rc), ("rc=%Rrc GCPhys=%RGp offPage=%#x cbToRead=%#x\n", rc, GCPhys, offPage, cbToRead), rc);
746	}
747
748	offPage = 0; /* A next page is read from 0 offset. */
749	cbRemaining -= cbToRead;
750	pu8Dst += cbToRead;
751	}
752
753	return VINF_SUCCESS;
754	}
755
756	/** Copy data from the host buffer to guest memory.
757	*
758	* @returns VBox status code.
759	* @param pDevIns The device instance for PDMDevHlp.
760	* @param pPtr Description of the destination HGCM pointer parameter.
761	* @param pvSrc The source host buffer.
762	* @param cbSrc Size of the source host buffer.
763	*/
764	static int vmmdevR3HgcmGuestBufferWrite(PPDMDEVINSR3 pDevIns, const VBOXHGCMPARMPTR pPtr, const void pvSrc, uint32_t cbSrc)
765	{
766	int rc = VINF_SUCCESS;
767
768	uint8_t pu8Src = (uint8_t )pvSrc;
769	uint32_t offPage = pPtr->offFirstPage;
770	uint32_t cbRemaining = RT_MIN(cbSrc, pPtr->cbData);
771
772	uint32_t iPage;
773	for (iPage = 0; iPage < pPtr->cPages && cbRemaining > 0; ++iPage)
774	{
775	uint32_t cbToWrite = VMMDEV_PAGE_SIZE - offPage;
776	if (cbToWrite > cbRemaining)
777	cbToWrite = cbRemaining;
778
779	/* Skip invalid pages. */
780	const RTGCPHYS GCPhys = pPtr->paPages[iPage];
781	if (GCPhys != NIL_RTGCPHYS)
782	{
783	rc = PDMDevHlpPhysWrite(pDevIns, GCPhys + offPage, pu8Src, cbToWrite);
784	AssertRCBreak(rc);
785	}
786
787	offPage = 0; /* A next page is written at 0 offset. */
788	cbRemaining -= cbToWrite;
789	pu8Src += cbToWrite;
790	}
791
792	return rc;
793	}
794
795	/** Initializes pCmd->paHostParms from already initialized pCmd->paGuestParms.
796	* Allocates memory for pointer parameters and copies data from the guest.
797	*
798	* @returns VBox status code that the guest should see.
799	* @param pDevIns The device instance.
800	* @param pThisCC The VMMDev ring-3 instance data.
801	* @param pCmd Command structure where host parameters needs initialization.
802	* @param pbReq The request buffer.
803	*/
804	static int vmmdevR3HgcmInitHostParameters(PPDMDEVINS pDevIns, PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd, uint8_t const *pbReq)
805	{
806	AssertReturn(pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL, VERR_INTERNAL_ERROR);
807
808	for (uint32_t i = 0; i < pCmd->u.call.cParms; ++i)
809	{
810	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
811	VBOXHGCMSVCPARM * const pHostParm = &pCmd->u.call.paHostParms[i];
812
813	switch (pGuestParm->enmType)
814	{
815	case VMMDevHGCMParmType_32bit:
816	{
817	pHostParm->type = VBOX_HGCM_SVC_PARM_32BIT;
818	pHostParm->u.uint32 = (uint32_t)pGuestParm->u.val.u64Value;
819
820	break;
821	}
822
823	case VMMDevHGCMParmType_64bit:
824	{
825	pHostParm->type = VBOX_HGCM_SVC_PARM_64BIT;
826	pHostParm->u.uint64 = pGuestParm->u.val.u64Value;
827
828	break;
829	}
830
831	case VMMDevHGCMParmType_PageList:
832	case VMMDevHGCMParmType_LinAddr_In:
833	case VMMDevHGCMParmType_LinAddr_Out:
834	case VMMDevHGCMParmType_LinAddr:
835	case VMMDevHGCMParmType_Embedded:
836	case VMMDevHGCMParmType_ContiguousPageList:
837	{
838	const uint32_t cbData = pGuestParm->u.ptr.cbData;
839
840	pHostParm->type = VBOX_HGCM_SVC_PARM_PTR;
841	pHostParm->u.pointer.size = cbData;
842
843	if (cbData)
844	{
845	/* Zero memory, the buffer content is potentially copied to the guest. */
846	void *pv = vmmdevR3HgcmCallMemAllocZ(pThisCC, pCmd, cbData);
847	AssertReturn(pv, VERR_NO_MEMORY);
848	pHostParm->u.pointer.addr = pv;
849
850	if (pGuestParm->u.ptr.fu32Direction & VBOX_HGCM_F_PARM_DIRECTION_TO_HOST)
851	{
852	if (pGuestParm->enmType != VMMDevHGCMParmType_Embedded)
853	{
854	if (pGuestParm->enmType != VMMDevHGCMParmType_ContiguousPageList)
855	{
856	int rc = vmmdevR3HgcmGuestBufferRead(pDevIns, pv, cbData, &pGuestParm->u.ptr);
857	ASSERT_GUEST_RETURN(RT_SUCCESS(rc), rc);
858	RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
859	}
860	else
861	{
862	int rc = PDMDevHlpPhysRead(pDevIns,
863	pGuestParm->u.ptr.paPages[0] \| pGuestParm->u.ptr.offFirstPage,
864	pv, cbData);
865	ASSERT_GUEST_RETURN(RT_SUCCESS(rc), rc);
866	RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
867	}
868	}
869	else
870	{
871	memcpy(pv, &pbReq[pGuestParm->u.ptr.offFirstPage], cbData);
872	RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
873	}
874	}
875	}
876	else
877	{
878	pHostParm->u.pointer.addr = NULL;
879	}
880
881	break;
882	}
883
884	case VMMDevHGCMParmType_NoBouncePageList:
885	{
886	pHostParm->type = VBOX_HGCM_SVC_PARM_PAGES;
887	pHostParm->u.Pages.cb = pGuestParm->u.Pages.cbData;
888	pHostParm->u.Pages.cPages = pGuestParm->u.Pages.cPages;
889	pHostParm->u.Pages.papvPages = (void **)&pGuestParm->u.Pages.paPgLocks[pGuestParm->u.Pages.cPages];
890
891	break;
892	}
893
894	default:
895	ASSERT_GUEST_FAILED_RETURN(VERR_INVALID_PARAMETER);
896	}
897	}
898
899	return VINF_SUCCESS;
900	}
901
902
903	/** Allocate and initialize VBOXHGCMCMD structure for a HGCMCall request.
904	*
905	* @returns VBox status code that the guest should see.
906	* @param pThisCC The VMMDev ring-3 instance data.
907	* @param pHGCMCall The HGCMCall request (cached in host memory).
908	* @param cbHGCMCall Size of the request.
909	* @param GCPhys Guest physical address of the request.
910	* @param enmRequestType The request type. Distinguishes 64 and 32 bit calls.
911	* @param ppCmd Where to store pointer to allocated command.
912	* @param pcbHGCMParmStruct Where to store size of used HGCM parameter structure.
913	*/
914	static int vmmdevR3HgcmCallAlloc(PVMMDEVCC pThisCC, const VMMDevHGCMCall *pHGCMCall, uint32_t cbHGCMCall, RTGCPHYS GCPhys,
915	VMMDevRequestType enmRequestType, PVBOXHGCMCMD ppCmd, uint32_t pcbHGCMParmStruct)
916	{
917	#ifdef VBOX_WITH_64_BITS_GUESTS
918	const uint32_t cbHGCMParmStruct = enmRequestType == VMMDevReq_HGCMCall64 ? sizeof(HGCMFunctionParameter64)
919	: sizeof(HGCMFunctionParameter32);
920	#else
921	const uint32_t cbHGCMParmStruct = sizeof(HGCMFunctionParameter);
922	#endif
923
924	const uint32_t cParms = pHGCMCall->cParms;
925
926	/* Whether there is enough space for parameters and sane upper limit. */
927	ASSERT_GUEST_STMT_RETURN( cParms <= (cbHGCMCall - sizeof(VMMDevHGCMCall)) / cbHGCMParmStruct
928	&& cParms <= VMMDEV_MAX_HGCM_PARMS,
929	LogRelMax(50, ("VMMDev: request packet with invalid number of HGCM parameters: %d vs %d. Refusing operation.\n",
930	(cbHGCMCall - sizeof(VMMDevHGCMCall)) / cbHGCMParmStruct, cParms)),
931	VERR_INVALID_PARAMETER);
932	RT_UNTRUSTED_VALIDATED_FENCE();
933
934	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_CALL, GCPhys, cbHGCMCall, cParms,
935	pHGCMCall->header.header.fRequestor);
936	if (pCmd == NULL)
937	return VERR_NO_MEMORY;
938
939	/* Request type has been validated in vmmdevReqDispatcher. */
940	pCmd->enmRequestType = enmRequestType;
941	pCmd->u.call.u32ClientID = pHGCMCall->u32ClientID;
942	pCmd->u.call.u32Function = pHGCMCall->u32Function;
943
944	*ppCmd = pCmd;
945	*pcbHGCMParmStruct = cbHGCMParmStruct;
946	return VINF_SUCCESS;
947	}
948
949	/**
950	* Heap budget wrapper around RTMemAlloc and RTMemAllocZ.
951	*/
952	static void *vmmdevR3HgcmCallMemAllocEx(PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd, size_t cbRequested, bool fZero)
953	{
954	uintptr_t idx = pCmd->idxHeapAcc;
955	AssertStmt(idx < RT_ELEMENTS(pThisCC->aHgcmAcc), idx %= RT_ELEMENTS(pThisCC->aHgcmAcc));
956
957	/* Check against max heap costs for this request. */
958	Assert(pCmd->cbHeapCost <= VMMDEV_MAX_HGCM_DATA_SIZE);
959	if (cbRequested <= VMMDEV_MAX_HGCM_DATA_SIZE - pCmd->cbHeapCost)
960	{
961	/* Check heap budget (we're under lock). */
962	if (cbRequested <= pThisCC->aHgcmAcc[idx].cbHeapBudget)
963	{
964	/* Do the actual allocation. */
965	void *pv = fZero ? RTMemAllocZ(cbRequested) : RTMemAlloc(cbRequested);
966	if (pv)
967	{
968	/* Update the request cost and heap budget. */
969	Log5Func(("aHgcmAcc[%zu] %#RX64 += %#x (%p)\n", idx, pThisCC->aHgcmAcc[idx].cbHeapBudget, cbRequested, pCmd));
970	pThisCC->aHgcmAcc[idx].cbHeapBudget -= cbRequested;
971	pCmd->cbHeapCost += (uint32_t)cbRequested;
972	return pv;
973	}
974	LogFunc(("Heap alloc failed: cbRequested=%#zx - enmCmdType=%d\n", cbRequested, pCmd->enmCmdType));
975	}
976	else
977	LogFunc(("Heap budget overrun: cbRequested=%#zx cbHeapCost=%#x aHgcmAcc[%u].cbHeapBudget=%#RX64 - enmCmdType=%d\n",
978	cbRequested, pCmd->cbHeapCost, pCmd->idxHeapAcc, pThisCC->aHgcmAcc[idx].cbHeapBudget, pCmd->enmCmdType));
979	}
980	else
981	LogFunc(("Request too big: cbRequested=%#zx cbHeapCost=%#x - enmCmdType=%d\n",
982	cbRequested, pCmd->cbHeapCost, pCmd->enmCmdType));
983	STAM_REL_COUNTER_INC(&pThisCC->aHgcmAcc[idx].StatBudgetOverruns);
984	return NULL;
985	}
986
987	/**
988	* Heap budget wrapper around RTMemAlloc.
989	*/
990	DECLINLINE(void *) vmmdevR3HgcmCallMemAlloc(PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd, size_t cbRequested)
991	{
992	return vmmdevR3HgcmCallMemAllocEx(pThisCC, pCmd, cbRequested, false /fZero/);
993	}
994
995	/**
996	* Heap budget wrapper around RTMemAllocZ.
997	*/
998	DECLINLINE(void *) vmmdevR3HgcmCallMemAllocZ(PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd, size_t cbRequested)
999	{
1000	return vmmdevR3HgcmCallMemAllocEx(pThisCC, pCmd, cbRequested, true /fZero/);
1001	}
1002
1003	/** Copy VMMDevHGCMCall request data from the guest to VBOXHGCMCMD command.
1004	*
1005	* @returns VBox status code that the guest should see.
1006	* @param pDevIns The device instance.
1007	* @param pThisCC The VMMDev ring-3 instance data.
1008	* @param pCmd The destination command.
1009	* @param pHGCMCall The HGCMCall request (cached in host memory).
1010	* @param cbHGCMCall Size of the request.
1011	* @param enmRequestType The request type. Distinguishes 64 and 32 bit calls.
1012	* @param cbHGCMParmStruct Size of used HGCM parameter structure.
1013	*/
1014	static int vmmdevR3HgcmCallFetchGuestParms(PPDMDEVINS pDevIns, PVMMDEVCC pThisCC, PVBOXHGCMCMD pCmd,
1015	const VMMDevHGCMCall *pHGCMCall, uint32_t cbHGCMCall,
1016	VMMDevRequestType enmRequestType, uint32_t cbHGCMParmStruct)
1017	{
1018	/*
1019	* Go over all guest parameters and initialize relevant VBOXHGCMCMD fields.
1020	* VBOXHGCMCMD must contain all information about the request,
1021	* the request will be not read from the guest memory again.
1022	*/
1023	#ifdef VBOX_WITH_64_BITS_GUESTS
1024	const bool f64Bits = (enmRequestType == VMMDevReq_HGCMCall64);
1025	#endif
1026
1027	const uint32_t cParms = pCmd->u.call.cParms;
1028
1029	/* Offsets in the request buffer to HGCM parameters and additional data. */
1030	const uint32_t offHGCMParms = sizeof(VMMDevHGCMCall);
1031	const uint32_t offExtra = offHGCMParms + cParms * cbHGCMParmStruct;
1032
1033	/* Pointer to the next HGCM parameter of the request. */
1034	const uint8_t pu8HGCMParm = (uint8_t )pHGCMCall + offHGCMParms;
1035
1036	for (uint32_t i = 0; i < cParms; ++i, pu8HGCMParm += cbHGCMParmStruct)
1037	{
1038	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
1039
1040	#ifdef VBOX_WITH_64_BITS_GUESTS
1041	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, type, HGCMFunctionParameter32, type);
1042	pGuestParm->enmType = ((HGCMFunctionParameter64 *)pu8HGCMParm)->type;
1043	#else
1044	pGuestParm->enmType = ((HGCMFunctionParameter *)pu8HGCMParm)->type;
1045	#endif
1046
1047	switch (pGuestParm->enmType)
1048	{
1049	case VMMDevHGCMParmType_32bit:
1050	{
1051	#ifdef VBOX_WITH_64_BITS_GUESTS
1052	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.value32, HGCMFunctionParameter32, u.value32);
1053	uint32_t pu32 = &((HGCMFunctionParameter64 )pu8HGCMParm)->u.value32;
1054	#else
1055	uint32_t pu32 = &((HGCMFunctionParameter )pu8HGCMParm)->u.value32;
1056	#endif
1057	LogFunc(("uint32 guest parameter %RI32\n", *pu32));
1058
1059	pGuestParm->u.val.u64Value = *pu32;
1060	pGuestParm->u.val.offValue = (uint32_t)((uintptr_t)pu32 - (uintptr_t)pHGCMCall);
1061	pGuestParm->u.val.cbValue = sizeof(uint32_t);
1062
1063	break;
1064	}
1065
1066	case VMMDevHGCMParmType_64bit:
1067	{
1068	#ifdef VBOX_WITH_64_BITS_GUESTS
1069	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.value64, HGCMFunctionParameter32, u.value64);
1070	uint64_t pu64 = (uint64_t )(uintptr_t)&((HGCMFunctionParameter64 )pu8HGCMParm)->u.value64; / MSC detect misalignment, thus casts. */
1071	#else
1072	uint64_t pu64 = &((HGCMFunctionParameter )pu8HGCMParm)->u.value64;
1073	#endif
1074	LogFunc(("uint64 guest parameter %RI64\n", *pu64));
1075
1076	pGuestParm->u.val.u64Value = *pu64;
1077	pGuestParm->u.val.offValue = (uint32_t)((uintptr_t)pu64 - (uintptr_t)pHGCMCall);
1078	pGuestParm->u.val.cbValue = sizeof(uint64_t);
1079
1080	break;
1081	}
1082
1083	case VMMDevHGCMParmType_LinAddr_In: /* In (read) */
1084	case VMMDevHGCMParmType_LinAddr_Out: /* Out (write) */
1085	case VMMDevHGCMParmType_LinAddr: /* In & Out */
1086	{
1087	#ifdef VBOX_WITH_64_BITS_GUESTS
1088	uint32_t cbData = f64Bits ? ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.Pointer.size
1089	: ((HGCMFunctionParameter32 *)pu8HGCMParm)->u.Pointer.size;
1090	RTGCPTR GCPtr = f64Bits ? ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.Pointer.u.linearAddr
1091	: ((HGCMFunctionParameter32 *)pu8HGCMParm)->u.Pointer.u.linearAddr;
1092	#else
1093	uint32_t cbData = ((HGCMFunctionParameter *)pu8HGCMParm)->u.Pointer.size;
1094	RTGCPTR GCPtr = ((HGCMFunctionParameter *)pu8HGCMParm)->u.Pointer.u.linearAddr;
1095	#endif
1096	LogFunc(("LinAddr guest parameter %RGv, cb %u\n", GCPtr, cbData));
1097
1098	ASSERT_GUEST_RETURN(cbData <= VMMDEV_MAX_HGCM_DATA_SIZE, VERR_INVALID_PARAMETER);
1099
1100	const uint32_t offFirstPage = cbData > 0 ? GCPtr & VMMDEV_PAGE_OFFSET_MASK : 0;
1101	const uint32_t cPages = cbData > 0 ? (offFirstPage + cbData + VMMDEV_PAGE_SIZE - 1) / VMMDEV_PAGE_SIZE : 0;
1102
1103	pGuestParm->u.ptr.cbData = cbData;
1104	pGuestParm->u.ptr.offFirstPage = offFirstPage;
1105	pGuestParm->u.ptr.cPages = cPages;
1106	pGuestParm->u.ptr.fu32Direction = vmmdevR3HgcmParmTypeToDirection(pGuestParm->enmType);
1107
1108	if (cbData > 0)
1109	{
1110	if (cPages == 1)
1111	pGuestParm->u.ptr.paPages = &pGuestParm->u.ptr.GCPhysSinglePage;
1112	else
1113	{
1114	/* (Max 262144 bytes with current limits.) */
1115	pGuestParm->u.ptr.paPages = (RTGCPHYS *)vmmdevR3HgcmCallMemAlloc(pThisCC, pCmd,
1116	cPages * sizeof(RTGCPHYS));
1117	AssertReturn(pGuestParm->u.ptr.paPages, VERR_NO_MEMORY);
1118	}
1119
1120	/* Gonvert the guest linear pointers of pages to physical addresses. */
1121	GCPtr &= ~(RTGCPTR)VMMDEV_PAGE_OFFSET_MASK;
1122	for (uint32_t iPage = 0; iPage < cPages; ++iPage)
1123	{
1124	/* The guest might specify invalid GCPtr, just skip such addresses.
1125	* Also if the guest parameters are fetched when restoring an old saved state,
1126	* then GCPtr may become invalid and do not have a corresponding GCPhys.
1127	* The command restoration routine will take care of this.
1128	*/
1129	RTGCPHYS GCPhys;
1130	int rc2 = PDMDevHlpPhysGCPtr2GCPhys(pDevIns, GCPtr, &GCPhys);
1131	if (RT_FAILURE(rc2))
1132	GCPhys = NIL_RTGCPHYS;
1133	LogFunc(("Page %d: %RGv -> %RGp. %Rrc\n", iPage, GCPtr, GCPhys, rc2));
1134
1135	pGuestParm->u.ptr.paPages[iPage] = GCPhys;
1136	GCPtr += VMMDEV_PAGE_SIZE;
1137	}
1138	}
1139
1140	break;
1141	}
1142
1143	case VMMDevHGCMParmType_PageList:
1144	case VMMDevHGCMParmType_ContiguousPageList:
1145	case VMMDevHGCMParmType_NoBouncePageList:
1146	{
1147	#ifdef VBOX_WITH_64_BITS_GUESTS
1148	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.PageList.size, HGCMFunctionParameter32, u.PageList.size);
1149	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.PageList.offset, HGCMFunctionParameter32, u.PageList.offset);
1150	uint32_t cbData = ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.PageList.size;
1151	uint32_t offPageListInfo = ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.PageList.offset;
1152	#else
1153	uint32_t cbData = ((HGCMFunctionParameter *)pu8HGCMParm)->u.PageList.size;
1154	uint32_t offPageListInfo = ((HGCMFunctionParameter *)pu8HGCMParm)->u.PageList.offset;
1155	#endif
1156	LogFunc(("PageList guest parameter cb %u, offset %u\n", cbData, offPageListInfo));
1157
1158	ASSERT_GUEST_RETURN(cbData <= VMMDEV_MAX_HGCM_DATA_SIZE, VERR_INVALID_PARAMETER);
1159
1160	/** @todo respect zero byte page lists... */
1161	/* Check that the page list info is within the request. */
1162	ASSERT_GUEST_RETURN( offPageListInfo >= offExtra
1163	&& cbHGCMCall >= sizeof(HGCMPageListInfo)
1164	&& offPageListInfo <= cbHGCMCall - sizeof(HGCMPageListInfo),
1165	VERR_INVALID_PARAMETER);
1166	RT_UNTRUSTED_VALIDATED_FENCE();
1167
1168	/* The HGCMPageListInfo structure is within the request. */
1169	const HGCMPageListInfo pPageListInfo = (HGCMPageListInfo )((uint8_t *)pHGCMCall + offPageListInfo);
1170
1171	/* Enough space for page pointers? */
1172	const uint32_t cMaxPages = 1 + (cbHGCMCall - offPageListInfo - sizeof(HGCMPageListInfo)) / sizeof(RTGCPHYS);
1173	ASSERT_GUEST_RETURN( pPageListInfo->cPages > 0
1174	&& pPageListInfo->cPages <= cMaxPages,
1175	VERR_INVALID_PARAMETER);
1176
1177	/* Flags. */
1178	ASSERT_GUEST_MSG_RETURN(VBOX_HGCM_F_PARM_ARE_VALID(pPageListInfo->flags),
1179	("%#x\n", pPageListInfo->flags), VERR_INVALID_FLAGS);
1180	/* First page offset. */
1181	ASSERT_GUEST_MSG_RETURN(pPageListInfo->offFirstPage < VMMDEV_PAGE_SIZE,
1182	("%#x\n", pPageListInfo->offFirstPage), VERR_INVALID_PARAMETER);
1183
1184	/* Contiguous page lists only ever have a single page and
1185	no-bounce page list requires cPages to match the size exactly.
1186	Plain page list does not impose any restrictions on cPages currently. */
1187	ASSERT_GUEST_MSG_RETURN( pPageListInfo->cPages
1188	== (pGuestParm->enmType == VMMDevHGCMParmType_ContiguousPageList ? 1
1189	: RT_ALIGN_32(pPageListInfo->offFirstPage + cbData, VMMDEV_PAGE_SIZE)
1190	>> VMMDEV_PAGE_SHIFT)
1191	\|\| pGuestParm->enmType == VMMDevHGCMParmType_PageList,
1192	("offFirstPage=%#x cbData=%#x cPages=%#x enmType=%d\n",
1193	pPageListInfo->offFirstPage, cbData, pPageListInfo->cPages, pGuestParm->enmType),
1194	VERR_INVALID_PARAMETER);
1195
1196	RT_UNTRUSTED_VALIDATED_FENCE();
1197
1198	/*
1199	* Deal with no-bounce buffers first, as
1200	* VMMDevHGCMParmType_PageList is the fallback.
1201	*/
1202	if (pGuestParm->enmType == VMMDevHGCMParmType_NoBouncePageList)
1203	{
1204	/* Validate page offsets */
1205	ASSERT_GUEST_MSG_RETURN( !(pPageListInfo->aPages[0] & VMMDEV_PAGE_OFFSET_MASK)
1206	\|\| (pPageListInfo->aPages[0] & VMMDEV_PAGE_OFFSET_MASK) == pPageListInfo->offFirstPage,
1207	("%#RX64 offFirstPage=%#x\n", pPageListInfo->aPages[0], pPageListInfo->offFirstPage),
1208	VERR_INVALID_POINTER);
1209	uint32_t const cPages = pPageListInfo->cPages;
1210	for (uint32_t iPage = 1; iPage < cPages; iPage++)
1211	ASSERT_GUEST_MSG_RETURN(!(pPageListInfo->aPages[iPage] & VMMDEV_PAGE_OFFSET_MASK),
1212	("[%#zx]=%#RX64\n", iPage, pPageListInfo->aPages[iPage]), VERR_INVALID_POINTER);
1213	RT_UNTRUSTED_VALIDATED_FENCE();
1214
1215	pGuestParm->u.Pages.cbData = cbData;
1216	pGuestParm->u.Pages.offFirstPage = pPageListInfo->offFirstPage;
1217	pGuestParm->u.Pages.fFlags = pPageListInfo->flags;
1218	pGuestParm->u.Pages.cPages = (uint16_t)cPages;
1219	pGuestParm->u.Pages.fLocked = false;
1220	pGuestParm->u.Pages.paPgLocks = (PPGMPAGEMAPLOCK)vmmdevR3HgcmCallMemAllocZ(pThisCC, pCmd,
1221	( sizeof(PGMPAGEMAPLOCK)
1222	+ sizeof(void )) cPages);
1223	AssertReturn(pGuestParm->u.Pages.paPgLocks, VERR_NO_MEMORY);
1224
1225	/* Make sure the page offsets are sensible. */
1226	int rc = VINF_SUCCESS;
1227	void papvPages = (void )&pGuestParm->u.Pages.paPgLocks[cPages];
1228	if (pPageListInfo->flags & VBOX_HGCM_F_PARM_DIRECTION_FROM_HOST)
1229	rc = PDMDevHlpPhysBulkGCPhys2CCPtr(pDevIns, cPages, pPageListInfo->aPages, 0 /fFlags/,
1230	papvPages, pGuestParm->u.Pages.paPgLocks);
1231	else
1232	rc = PDMDevHlpPhysBulkGCPhys2CCPtrReadOnly(pDevIns, cPages, pPageListInfo->aPages, 0 /fFlags/,
1233	(void const **)papvPages, pGuestParm->u.Pages.paPgLocks);
1234	if (RT_SUCCESS(rc))
1235	{
1236	papvPages[0] = (void *)((uintptr_t)papvPages[0] \| pPageListInfo->offFirstPage);
1237	pGuestParm->u.Pages.fLocked = true;
1238	break;
1239	}
1240
1241	/* Locking failed, bail out. In case of MMIO we fall back on regular page list handling. */
1242	RTMemFree(pGuestParm->u.Pages.paPgLocks);
1243	pGuestParm->u.Pages.paPgLocks = NULL;
1244	STAM_REL_COUNTER_INC(&pThisCC->StatHgcmFailedPageListLocking);
1245	ASSERT_GUEST_MSG_RETURN(rc == VERR_PGM_PHYS_PAGE_RESERVED, ("cPages=%u %Rrc\n", cPages, rc), rc);
1246	pGuestParm->enmType = VMMDevHGCMParmType_PageList;
1247	}
1248
1249	/*
1250	* Regular page list or contiguous page list.
1251	*/
1252	pGuestParm->u.ptr.cbData = cbData;
1253	pGuestParm->u.ptr.offFirstPage = pPageListInfo->offFirstPage;
1254	pGuestParm->u.ptr.cPages = pPageListInfo->cPages;
1255	pGuestParm->u.ptr.fu32Direction = pPageListInfo->flags;
1256	if (pPageListInfo->cPages == 1)
1257	{
1258	pGuestParm->u.ptr.paPages = &pGuestParm->u.ptr.GCPhysSinglePage;
1259	pGuestParm->u.ptr.GCPhysSinglePage = pPageListInfo->aPages[0];
1260	}
1261	else
1262	{
1263	pGuestParm->u.ptr.paPages = (RTGCPHYS *)vmmdevR3HgcmCallMemAlloc(pThisCC, pCmd,
1264	pPageListInfo->cPages * sizeof(RTGCPHYS));
1265	AssertReturn(pGuestParm->u.ptr.paPages, VERR_NO_MEMORY);
1266
1267	for (uint32_t iPage = 0; iPage < pGuestParm->u.ptr.cPages; ++iPage)
1268	pGuestParm->u.ptr.paPages[iPage] = pPageListInfo->aPages[iPage];
1269	}
1270	break;
1271	}
1272
1273	case VMMDevHGCMParmType_Embedded:
1274	{
1275	#ifdef VBOX_WITH_64_BITS_GUESTS
1276	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.Embedded.cbData, HGCMFunctionParameter32, u.Embedded.cbData);
1277	uint32_t const cbData = ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.Embedded.cbData;
1278	uint32_t const offData = ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.Embedded.offData;
1279	uint32_t const fFlags = ((HGCMFunctionParameter64 *)pu8HGCMParm)->u.Embedded.fFlags;
1280	#else
1281	uint32_t const cbData = ((HGCMFunctionParameter *)pu8HGCMParm)->u.Embedded.cbData;
1282	uint32_t const offData = ((HGCMFunctionParameter *)pu8HGCMParm)->u.Embedded.offData;
1283	uint32_t const fFlags = ((HGCMFunctionParameter *)pu8HGCMParm)->u.Embedded.fFlags;
1284	#endif
1285	LogFunc(("Embedded guest parameter cb %u, offset %u, flags %#x\n", cbData, offData, fFlags));
1286
1287	ASSERT_GUEST_RETURN(cbData <= VMMDEV_MAX_HGCM_DATA_SIZE, VERR_INVALID_PARAMETER);
1288
1289	/* Check flags and buffer range. */
1290	ASSERT_GUEST_MSG_RETURN(VBOX_HGCM_F_PARM_ARE_VALID(fFlags), ("%#x\n", fFlags), VERR_INVALID_FLAGS);
1291	ASSERT_GUEST_MSG_RETURN( offData >= offExtra
1292	&& offData <= cbHGCMCall
1293	&& cbData <= cbHGCMCall - offData,
1294	("offData=%#x cbData=%#x cbHGCMCall=%#x offExtra=%#x\n", offData, cbData, cbHGCMCall, offExtra),
1295	VERR_INVALID_PARAMETER);
1296	RT_UNTRUSTED_VALIDATED_FENCE();
1297
1298	/* We use part of the ptr member. */
1299	pGuestParm->u.ptr.fu32Direction = fFlags;
1300	pGuestParm->u.ptr.cbData = cbData;
1301	pGuestParm->u.ptr.offFirstPage = offData;
1302	pGuestParm->u.ptr.GCPhysSinglePage = pCmd->GCPhys + offData;
1303	pGuestParm->u.ptr.cPages = 1;
1304	pGuestParm->u.ptr.paPages = &pGuestParm->u.ptr.GCPhysSinglePage;
1305	break;
1306	}
1307
1308	default:
1309	ASSERT_GUEST_FAILED_RETURN(VERR_INVALID_PARAMETER);
1310	}
1311	}
1312
1313	return VINF_SUCCESS;
1314	}
1315
1316	/**
1317	* Handles VMMDevHGCMCall request.
1318	*
1319	* @returns VBox status code that the guest should see.
1320	* @param pDevIns The device instance.
1321	* @param pThis The VMMDev shared instance data.
1322	* @param pThisCC The VMMDev ring-3 instance data.
1323	* @param pHGCMCall The request to handle (cached in host memory).
1324	* @param cbHGCMCall Size of the entire request (including HGCM parameters).
1325	* @param GCPhys The guest physical address of the request.
1326	* @param enmRequestType The request type. Distinguishes 64 and 32 bit calls.
1327	* @param tsArrival The STAM_GET_TS() value when the request arrived.
1328	* @param ppLock Pointer to the lock info pointer (latter can be
1329	* NULL). Set to NULL if HGCM takes lock ownership.
1330	*/
1331	int vmmdevR3HgcmCall(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, const VMMDevHGCMCall *pHGCMCall, uint32_t cbHGCMCall,
1332	RTGCPHYS GCPhys, VMMDevRequestType enmRequestType, uint64_t tsArrival, PVMMDEVREQLOCK *ppLock)
1333	{
1334	LogFunc(("client id = %d, function = %d, cParms = %d, enmRequestType = %d, fRequestor = %#x\n", pHGCMCall->u32ClientID,
1335	pHGCMCall->u32Function, pHGCMCall->cParms, enmRequestType, pHGCMCall->header.header.fRequestor));
1336
1337	/*
1338	* Validation.
1339	*/
1340	ASSERT_GUEST_RETURN(cbHGCMCall >= sizeof(VMMDevHGCMCall), VERR_INVALID_PARAMETER);
1341	#ifdef VBOX_WITH_64_BITS_GUESTS
1342	ASSERT_GUEST_RETURN( enmRequestType == VMMDevReq_HGCMCall32
1343	\|\| enmRequestType == VMMDevReq_HGCMCall64, VERR_INVALID_PARAMETER);
1344	#else
1345	ASSERT_GUEST_RETURN(enmRequestType == VMMDevReq_HGCMCall32, VERR_INVALID_PARAMETER);
1346	#endif
1347	RT_UNTRUSTED_VALIDATED_FENCE();
1348
1349	/*
1350	* Create a command structure.
1351	*/
1352	PVBOXHGCMCMD pCmd;
1353	uint32_t cbHGCMParmStruct;
1354	int rc = vmmdevR3HgcmCallAlloc(pThisCC, pHGCMCall, cbHGCMCall, GCPhys, enmRequestType, &pCmd, &cbHGCMParmStruct);
1355	if (RT_SUCCESS(rc))
1356	{
1357	pCmd->tsArrival = tsArrival;
1358	PVMMDEVREQLOCK pLock = *ppLock;
1359	if (pLock)
1360	{
1361	pCmd->ReqMapLock = pLock->Lock;
1362	pCmd->pvReqLocked = pLock->pvReq;
1363	*ppLock = NULL;
1364	}
1365
1366	rc = vmmdevR3HgcmCallFetchGuestParms(pDevIns, pThisCC, pCmd, pHGCMCall, cbHGCMCall, enmRequestType, cbHGCMParmStruct);
1367	if (RT_SUCCESS(rc))
1368	{
1369	/* Copy guest data to host parameters, so HGCM services can use the data. */
1370	rc = vmmdevR3HgcmInitHostParameters(pDevIns, pThisCC, pCmd, (uint8_t const *)pHGCMCall);
1371	if (RT_SUCCESS(rc))
1372	{
1373	/*
1374	* Pass the function call to HGCM connector for actual processing
1375	*/
1376	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
1377
1378	#if 0 /* DONT ENABLE - for performance hacking. */
1379	if ( pCmd->u.call.u32Function == 9
1380	&& pCmd->u.call.cParms == 5)
1381	{
1382	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
1383
1384	if (pCmd->pvReqLocked)
1385	{
1386	VMMDevHGCMRequestHeader volatile pHeader = (VMMDevHGCMRequestHeader volatile )pCmd->pvReqLocked;
1387	pHeader->header.rc = VINF_SUCCESS;
1388	pHeader->result = VINF_SUCCESS;
1389	pHeader->fu32Flags \|= VBOX_HGCM_REQ_DONE;
1390	}
1391	else
1392	{
1393	VMMDevHGCMRequestHeader pHeader = (VMMDevHGCMRequestHeader )pHGCMCall;
1394	pHeader->header.rc = VINF_SUCCESS;
1395	pHeader->result = VINF_SUCCESS;
1396	pHeader->fu32Flags \|= VBOX_HGCM_REQ_DONE;
1397	PDMDevHlpPhysWrite(pDevIns, GCPhys, pHeader, sizeof(*pHeader));
1398	}
1399	vmmdevR3HgcmCmdFree(pDevIns, pThisCC, pCmd);
1400	return VINF_HGCM_ASYNC_EXECUTE; /* ignored, but avoids assertions. */
1401	}
1402	#endif
1403
1404	rc = pThisCC->pHGCMDrv->pfnCall(pThisCC->pHGCMDrv, pCmd,
1405	pCmd->u.call.u32ClientID, pCmd->u.call.u32Function,
1406	pCmd->u.call.cParms, pCmd->u.call.paHostParms, tsArrival);
1407
1408	if (rc == VINF_HGCM_ASYNC_EXECUTE)
1409	{
1410	/*
1411	* Done. Just update statistics and return.
1412	*/
1413	#ifndef VBOX_WITHOUT_RELEASE_STATISTICS
1414	uint64_t tsNow;
1415	STAM_GET_TS(tsNow);
1416	STAM_REL_PROFILE_ADD_PERIOD(&pThisCC->StatHgcmCmdArrival, tsNow - tsArrival);
1417	#endif
1418	return rc;
1419	}
1420
1421	/*
1422	* Failed, bail out.
1423	*/
1424	LogFunc(("pfnCall rc = %Rrc\n", rc));
1425	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
1426	}
1427	}
1428	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
1429	}
1430	return rc;
1431	}
1432
1433	/**
1434	* VMMDevReq_HGCMCancel worker.
1435	*
1436	* @returns VBox status code that the guest should see.
1437	* @param pThisCC The VMMDev ring-3 instance data.
1438	* @param pHGCMCancel The request to handle (cached in host memory).
1439	* @param GCPhys The address of the request.
1440	*
1441	* @thread EMT
1442	*/
1443	int vmmdevR3HgcmCancel(PVMMDEVCC pThisCC, const VMMDevHGCMCancel *pHGCMCancel, RTGCPHYS GCPhys)
1444	{
1445	NOREF(pHGCMCancel);
1446	int rc = vmmdevR3HgcmCancel2(pThisCC, GCPhys);
1447	return rc == VERR_NOT_FOUND ? VERR_INVALID_PARAMETER : rc;
1448	}
1449
1450	/**
1451	* VMMDevReq_HGCMCancel2 worker.
1452	*
1453	* @retval VINF_SUCCESS on success.
1454	* @retval VERR_NOT_FOUND if the request was not found.
1455	* @retval VERR_INVALID_PARAMETER if the request address is invalid.
1456	*
1457	* @param pThisCC The VMMDev ring-3 instance data.
1458	* @param GCPhys The address of the request that should be cancelled.
1459	*
1460	* @thread EMT
1461	*/
1462	int vmmdevR3HgcmCancel2(PVMMDEVCC pThisCC, RTGCPHYS GCPhys)
1463	{
1464	if ( GCPhys == 0
1465	\|\| GCPhys == NIL_RTGCPHYS
1466	\|\| GCPhys == NIL_RTGCPHYS32)
1467	{
1468	Log(("vmmdevR3HgcmCancel2: GCPhys=%#x\n", GCPhys));
1469	return VERR_INVALID_PARAMETER;
1470	}
1471
1472	/*
1473	* Locate the command and cancel it while under the protection of
1474	* the lock. hgcmCompletedWorker makes assumptions about this.
1475	*/
1476	int rc = vmmdevR3HgcmCmdListLock(pThisCC);
1477	AssertRCReturn(rc, rc);
1478
1479	PVBOXHGCMCMD pCmd = vmmdevR3HgcmFindCommandLocked(pThisCC, GCPhys);
1480	if (pCmd)
1481	{
1482	pCmd->fCancelled = true;
1483
1484	Log(("vmmdevR3HgcmCancel2: Cancelled pCmd=%p / GCPhys=%#x\n", pCmd, GCPhys));
1485	if (pThisCC->pHGCMDrv)
1486	pThisCC->pHGCMDrv->pfnCancelled(pThisCC->pHGCMDrv, pCmd,
1487	pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL ? pCmd->u.call.u32ClientID
1488	: pCmd->enmCmdType == VBOXHGCMCMDTYPE_CONNECT ? pCmd->u.connect.u32ClientID
1489	: pCmd->enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT ? pCmd->u.disconnect.u32ClientID
1490	: 0);
1491	}
1492	else
1493	rc = VERR_NOT_FOUND;
1494
1495	vmmdevR3HgcmCmdListUnlock(pThisCC);
1496	return rc;
1497	}
1498
1499	/** Write HGCM call parameters and buffers back to the guest request and memory.
1500	*
1501	* @returns VBox status code that the guest should see.
1502	* @param pDevIns The device instance.
1503	* @param pCmd Completed call command.
1504	* @param pHGCMCall The guestrequest which needs updating (cached in the host memory).
1505	* @param pbReq The request copy or locked memory for handling
1506	* embedded buffers.
1507	*/
1508	static int vmmdevR3HgcmCompleteCallRequest(PPDMDEVINS pDevIns, PVBOXHGCMCMD pCmd, VMMDevHGCMCall pHGCMCall, uint8_t pbReq)
1509	{
1510	AssertReturn(pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL, VERR_INTERNAL_ERROR);
1511
1512	/*
1513	* Go over parameter descriptions saved in pCmd.
1514	*/
1515	#ifdef VBOX_WITH_64_BITS_GUESTS
1516	HGCMFunctionParameter64 pReqParm = (HGCMFunctionParameter64 )(pbReq + sizeof(VMMDevHGCMCall));
1517	size_t const cbHGCMParmStruct = pCmd->enmRequestType == VMMDevReq_HGCMCall64
1518	? sizeof(HGCMFunctionParameter64) : sizeof(HGCMFunctionParameter32);
1519	#else
1520	HGCMFunctionParameter pReqParm = (HGCMFunctionParameter )(pbReq + sizeof(VMMDevHGCMCall));
1521	size_t const cbHGCMParmStruct = sizeof(HGCMFunctionParameter);
1522	#endif
1523	for (uint32_t i = 0;
1524	i < pCmd->u.call.cParms;
1525	#ifdef VBOX_WITH_64_BITS_GUESTS
1526	++i, pReqParm = (HGCMFunctionParameter64 )((uint8_t )pReqParm + cbHGCMParmStruct)
1527	#else
1528	++i, pReqParm = (HGCMFunctionParameter )((uint8_t )pReqParm + cbHGCMParmStruct)
1529	#endif
1530	)
1531	{
1532	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
1533	VBOXHGCMSVCPARM * const pHostParm = &pCmd->u.call.paHostParms[i];
1534
1535	const HGCMFunctionParameterType enmType = pGuestParm->enmType;
1536	switch (enmType)
1537	{
1538	case VMMDevHGCMParmType_32bit:
1539	case VMMDevHGCMParmType_64bit:
1540	{
1541	const VBOXHGCMPARMVAL * const pVal = &pGuestParm->u.val;
1542	const void pvSrc = enmType == VMMDevHGCMParmType_32bit ? (void )&pHostParm->u.uint32
1543	: (void *)&pHostParm->u.uint64;
1544	/** @todo optimize memcpy away here. */
1545	memcpy((uint8_t *)pHGCMCall + pVal->offValue, pvSrc, pVal->cbValue);
1546	break;
1547	}
1548
1549	case VMMDevHGCMParmType_LinAddr_In:
1550	case VMMDevHGCMParmType_LinAddr_Out:
1551	case VMMDevHGCMParmType_LinAddr:
1552	case VMMDevHGCMParmType_PageList:
1553	{
1554	/** @todo Update the return buffer size? */
1555	const VBOXHGCMPARMPTR * const pPtr = &pGuestParm->u.ptr;
1556	if ( pPtr->cbData > 0
1557	&& (pPtr->fu32Direction & VBOX_HGCM_F_PARM_DIRECTION_FROM_HOST))
1558	{
1559	const void *pvSrc = pHostParm->u.pointer.addr;
1560	uint32_t cbSrc = pHostParm->u.pointer.size;
1561	int rc = vmmdevR3HgcmGuestBufferWrite(pDevIns, pPtr, pvSrc, cbSrc);
1562	if (RT_FAILURE(rc))
1563	break;
1564	}
1565	break;
1566	}
1567
1568	case VMMDevHGCMParmType_Embedded:
1569	{
1570	const VBOXHGCMPARMPTR * const pPtr = &pGuestParm->u.ptr;
1571
1572	/* Update size. */
1573	#ifdef VBOX_WITH_64_BITS_GUESTS
1574	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.Embedded.cbData, HGCMFunctionParameter32, u.Embedded.cbData);
1575	#endif
1576	pReqParm->u.Embedded.cbData = pHostParm->u.pointer.size;
1577
1578	/* Copy out data. */
1579	if ( pPtr->cbData > 0
1580	&& (pPtr->fu32Direction & VBOX_HGCM_F_PARM_DIRECTION_FROM_HOST))
1581	{
1582	const void *pvSrc = pHostParm->u.pointer.addr;
1583	uint32_t cbSrc = pHostParm->u.pointer.size;
1584	uint32_t cbToCopy = RT_MIN(cbSrc, pPtr->cbData);
1585	memcpy(pbReq + pPtr->offFirstPage, pvSrc, cbToCopy);
1586	}
1587	break;
1588	}
1589
1590	case VMMDevHGCMParmType_ContiguousPageList:
1591	{
1592	const VBOXHGCMPARMPTR * const pPtr = &pGuestParm->u.ptr;
1593
1594	/* Update size. */
1595	#ifdef VBOX_WITH_64_BITS_GUESTS
1596	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.PageList.size, HGCMFunctionParameter32, u.PageList.size);
1597	#endif
1598	pReqParm->u.PageList.size = pHostParm->u.pointer.size;
1599
1600	/* Copy out data. */
1601	if ( pPtr->cbData > 0
1602	&& (pPtr->fu32Direction & VBOX_HGCM_F_PARM_DIRECTION_FROM_HOST))
1603	{
1604	const void *pvSrc = pHostParm->u.pointer.addr;
1605	uint32_t cbSrc = pHostParm->u.pointer.size;
1606	uint32_t cbToCopy = RT_MIN(cbSrc, pPtr->cbData);
1607	int rc = PDMDevHlpPhysWrite(pDevIns, pGuestParm->u.ptr.paPages[0] \| pGuestParm->u.ptr.offFirstPage,
1608	pvSrc, cbToCopy);
1609	if (RT_FAILURE(rc))
1610	break;
1611	}
1612	break;
1613	}
1614
1615	case VMMDevHGCMParmType_NoBouncePageList:
1616	{
1617	/* Update size. */
1618	#ifdef VBOX_WITH_64_BITS_GUESTS
1619	AssertCompileMembersSameSizeAndOffset(HGCMFunctionParameter64, u.PageList.size, HGCMFunctionParameter32, u.PageList.size);
1620	#endif
1621	pReqParm->u.PageList.size = pHostParm->u.Pages.cb;
1622
1623	/* unlock early. */
1624	if (pGuestParm->u.Pages.fLocked)
1625	{
1626	PDMDevHlpPhysBulkReleasePageMappingLocks(pDevIns, pGuestParm->u.Pages.cPages,
1627	pGuestParm->u.Pages.paPgLocks);
1628	pGuestParm->u.Pages.fLocked = false;
1629	}
1630	break;
1631	}
1632
1633	default:
1634	break;
1635	}
1636	}
1637
1638	return VINF_SUCCESS;
1639	}
1640
1641	/** Update HGCM request in the guest memory and mark it as completed.
1642	*
1643	* @returns VINF_SUCCESS or VERR_CANCELLED.
1644	* @param pInterface Pointer to this PDM interface.
1645	* @param result HGCM completion status code (VBox status code).
1646	* @param pCmd Completed command, which contains updated host parameters.
1647	*
1648	* @thread EMT
1649	*/
1650	static int hgcmCompletedWorker(PPDMIHGCMPORT pInterface, int32_t result, PVBOXHGCMCMD pCmd)
1651	{
1652	PVMMDEVCC pThisCC = RT_FROM_MEMBER(pInterface, VMMDEVCC, IHGCMPort);
1653	PPDMDEVINS pDevIns = pThisCC->pDevIns;
1654	PVMMDEV pThis = PDMDEVINS_2_DATA(pDevIns, PVMMDEV);
1655	#ifdef VBOX_WITH_DTRACE
1656	uint32_t idFunction = 0;
1657	uint32_t idClient = 0;
1658	#endif
1659
1660	if (result == VINF_HGCM_SAVE_STATE)
1661	{
1662	/* If the completion routine was called while the HGCM service saves its state,
1663	* then currently nothing to be done here. The pCmd stays in the list and will
1664	* be saved later when the VMMDev state will be saved and re-submitted on load.
1665	*
1666	* It it assumed that VMMDev saves state after the HGCM services (VMMDev driver
1667	* attached by constructor before it registers its SSM state), and, therefore,
1668	* VBOXHGCMCMD structures are not removed by vmmdevR3HgcmSaveState from the list,
1669	* while HGCM uses them.
1670	*/
1671	LogFlowFunc(("VINF_HGCM_SAVE_STATE for command %p\n", pCmd));
1672	return VINF_SUCCESS;
1673	}
1674
1675	VBOXDD_HGCMCALL_COMPLETED_EMT(pCmd, result);
1676
1677	int rc = VINF_SUCCESS;
1678
1679	/*
1680	* The cancellation protocol requires us to remove the command here
1681	* and then check the flag. Cancelled commands must not be written
1682	* back to guest memory.
1683	*/
1684	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
1685
1686	if (RT_LIKELY(!pCmd->fCancelled))
1687	{
1688	if (!pCmd->pvReqLocked)
1689	{
1690	/*
1691	* Request is not locked:
1692	*/
1693	VMMDevHGCMRequestHeader pHeader = (VMMDevHGCMRequestHeader )RTMemAlloc(pCmd->cbRequest);
1694	if (pHeader)
1695	{
1696	/*
1697	* Read the request from the guest memory for updating.
1698	* The request data is not be used for anything but checking the request type.
1699	*/
1700	PDMDevHlpPhysRead(pDevIns, pCmd->GCPhys, pHeader, pCmd->cbRequest);
1701	RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
1702
1703	/* Verify the request type. This is the only field which is used from the guest memory. */
1704	const VMMDevRequestType enmRequestType = pHeader->header.requestType;
1705	if ( enmRequestType == pCmd->enmRequestType
1706	\|\| enmRequestType == VMMDevReq_HGCMCancel)
1707	{
1708	RT_UNTRUSTED_VALIDATED_FENCE();
1709
1710	/*
1711	* Update parameters and data buffers.
1712	*/
1713	switch (enmRequestType)
1714	{
1715	#ifdef VBOX_WITH_64_BITS_GUESTS
1716	case VMMDevReq_HGCMCall64:
1717	#endif
1718	case VMMDevReq_HGCMCall32:
1719	{
1720	VMMDevHGCMCall pHGCMCall = (VMMDevHGCMCall )pHeader;
1721	rc = vmmdevR3HgcmCompleteCallRequest(pDevIns, pCmd, pHGCMCall, (uint8_t *)pHeader);
1722	#ifdef VBOX_WITH_DTRACE
1723	idFunction = pCmd->u.call.u32Function;
1724	idClient = pCmd->u.call.u32ClientID;
1725	#endif
1726	break;
1727	}
1728
1729	case VMMDevReq_HGCMConnect:
1730	{
1731	/* save the client id in the guest request packet */
1732	VMMDevHGCMConnect pHGCMConnect = (VMMDevHGCMConnect )pHeader;
1733	pHGCMConnect->u32ClientID = pCmd->u.connect.u32ClientID;
1734	break;
1735	}
1736
1737	default:
1738	/* make compiler happy */
1739	break;
1740	}
1741	}
1742	else
1743	{
1744	/* Guest has changed the command type. */
1745	LogRelMax(50, ("VMMDEV: Invalid HGCM command: pCmd->enmCmdType = 0x%08X, pHeader->header.requestType = 0x%08X\n",
1746	pCmd->enmCmdType, pHeader->header.requestType));
1747
1748	ASSERT_GUEST_FAILED_STMT(rc = VERR_INVALID_PARAMETER);
1749	}
1750
1751	/* Setup return code for the guest. */
1752	if (RT_SUCCESS(rc))
1753	pHeader->result = result;
1754	else
1755	pHeader->result = rc;
1756
1757	/* First write back the request. */
1758	PDMDevHlpPhysWrite(pDevIns, pCmd->GCPhys, pHeader, pCmd->cbRequest);
1759
1760	/* Mark request as processed. */
1761	pHeader->fu32Flags \|= VBOX_HGCM_REQ_DONE;
1762
1763	/* Second write the flags to mark the request as processed. */
1764	PDMDevHlpPhysWrite(pDevIns, pCmd->GCPhys + RT_UOFFSETOF(VMMDevHGCMRequestHeader, fu32Flags),
1765	&pHeader->fu32Flags, sizeof(pHeader->fu32Flags));
1766
1767	/* Now, when the command was removed from the internal list, notify the guest. */
1768	VMMDevNotifyGuest(pDevIns, pThis, pThisCC, VMMDEV_EVENT_HGCM);
1769
1770	RTMemFreeZ(pHeader, pCmd->cbRequest);
1771	}
1772	else
1773	{
1774	LogRelMax(10, ("VMMDev: Failed to allocate %u bytes for HGCM request completion!!!\n", pCmd->cbRequest));
1775	}
1776	}
1777	/*
1778	* Request was locked:
1779	*/
1780	else
1781	{
1782	VMMDevHGCMRequestHeader volatile pHeader = (VMMDevHGCMRequestHeader volatile )pCmd->pvReqLocked;
1783
1784	/* Verify the request type. This is the only field which is used from the guest memory. */
1785	const VMMDevRequestType enmRequestType = pHeader->header.requestType;
1786	if ( enmRequestType == pCmd->enmRequestType
1787	\|\| enmRequestType == VMMDevReq_HGCMCancel)
1788	{
1789	RT_UNTRUSTED_VALIDATED_FENCE();
1790
1791	/*
1792	* Update parameters and data buffers.
1793	*/
1794	switch (enmRequestType)
1795	{
1796	#ifdef VBOX_WITH_64_BITS_GUESTS
1797	case VMMDevReq_HGCMCall64:
1798	#endif
1799	case VMMDevReq_HGCMCall32:
1800	{
1801	VMMDevHGCMCall pHGCMCall = (VMMDevHGCMCall )pHeader;
1802	rc = vmmdevR3HgcmCompleteCallRequest(pDevIns, pCmd, pHGCMCall, (uint8_t *)pHeader);
1803	#ifdef VBOX_WITH_DTRACE
1804	idFunction = pCmd->u.call.u32Function;
1805	idClient = pCmd->u.call.u32ClientID;
1806	#endif
1807	break;
1808	}
1809
1810	case VMMDevReq_HGCMConnect:
1811	{
1812	/* save the client id in the guest request packet */
1813	VMMDevHGCMConnect pHGCMConnect = (VMMDevHGCMConnect )pHeader;
1814	pHGCMConnect->u32ClientID = pCmd->u.connect.u32ClientID;
1815	break;
1816	}
1817
1818	default:
1819	/* make compiler happy */
1820	break;
1821	}
1822	}
1823	else
1824	{
1825	/* Guest has changed the command type. */
1826	LogRelMax(50, ("VMMDEV: Invalid HGCM command: pCmd->enmCmdType = 0x%08X, pHeader->header.requestType = 0x%08X\n",
1827	pCmd->enmCmdType, pHeader->header.requestType));
1828
1829	ASSERT_GUEST_FAILED_STMT(rc = VERR_INVALID_PARAMETER);
1830	}
1831
1832	/* Setup return code for the guest. */
1833	if (RT_SUCCESS(rc))
1834	pHeader->result = result;
1835	else
1836	pHeader->result = rc;
1837
1838	/* Mark request as processed. */
1839	ASMAtomicOrU32(&pHeader->fu32Flags, VBOX_HGCM_REQ_DONE);
1840
1841	/* Now, when the command was removed from the internal list, notify the guest. */
1842	VMMDevNotifyGuest(pDevIns, pThis, pThisCC, VMMDEV_EVENT_HGCM);
1843	}
1844
1845	/* Set the status to success for now, though we might consider passing
1846	along the vmmdevR3HgcmCompleteCallRequest errors... */
1847	rc = VINF_SUCCESS;
1848	}
1849	else
1850	{
1851	LogFlowFunc(("Cancelled command %p\n", pCmd));
1852	rc = VERR_CANCELLED;
1853	}
1854
1855	#ifndef VBOX_WITHOUT_RELEASE_STATISTICS
1856	/* Save for final stats. */
1857	uint64_t const tsArrival = pCmd->tsArrival;
1858	uint64_t const tsComplete = pCmd->tsComplete;
1859	#endif
1860
1861	/* Deallocate the command memory. Enter the critsect for proper */
1862	VBOXDD_HGCMCALL_COMPLETED_DONE(pCmd, idFunction, idClient, result);
1863	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
1864
1865	#ifndef VBOX_WITHOUT_RELEASE_STATISTICS
1866	/* Update stats. */
1867	uint64_t tsNow;
1868	STAM_GET_TS(tsNow);
1869	STAM_REL_PROFILE_ADD_PERIOD(&pThisCC->StatHgcmCmdCompletion, tsNow - tsComplete);
1870	if (tsArrival != 0)
1871	STAM_REL_PROFILE_ADD_PERIOD(&pThisCC->StatHgcmCmdTotal, tsNow - tsArrival);
1872	#endif
1873
1874	return rc;
1875	}
1876
1877	/**
1878	* HGCM callback for request completion. Forwards to hgcmCompletedWorker.
1879	*
1880	* @returns VINF_SUCCESS or VERR_CANCELLED.
1881	* @param pInterface Pointer to this PDM interface.
1882	* @param result HGCM completion status code (VBox status code).
1883	* @param pCmd Completed command, which contains updated host parameters.
1884	*/
1885	DECLCALLBACK(int) hgcmR3Completed(PPDMIHGCMPORT pInterface, int32_t result, PVBOXHGCMCMD pCmd)
1886	{
1887	#if 0 /* This seems to be significantly slower. Half of MsgTotal time seems to be spend here. */
1888	PVMMDEVCC pThisCC = RT_FROM_MEMBER(pInterface, VMMDEVCC, IHGCMPort);
1889	STAM_GET_TS(pCmd->tsComplete);
1890
1891	VBOXDD_HGCMCALL_COMPLETED_REQ(pCmd, result);
1892
1893	/** @todo no longer necessary to forward to EMT, but it might be more
1894	* efficient...? */
1895	/* Not safe to execute asynchronously; forward to EMT */
1896	int rc = VMR3ReqCallVoidNoWait(PDMDevHlpGetVM(pDevIns), VMCPUID_ANY,
1897	(PFNRT)hgcmCompletedWorker, 3, pInterface, result, pCmd);
1898	AssertRC(rc);
1899	return VINF_SUCCESS; /* cannot tell if canceled or not... */
1900	#else
1901	STAM_GET_TS(pCmd->tsComplete);
1902	VBOXDD_HGCMCALL_COMPLETED_REQ(pCmd, result);
1903	return hgcmCompletedWorker(pInterface, result, pCmd);
1904	#endif
1905	}
1906
1907	/**
1908	* @interface_method_impl{PDMIHGCMPORT,pfnIsCmdRestored}
1909	*/
1910	DECLCALLBACK(bool) hgcmR3IsCmdRestored(PPDMIHGCMPORT pInterface, PVBOXHGCMCMD pCmd)
1911	{
1912	RT_NOREF(pInterface);
1913	return pCmd && pCmd->fRestored;
1914	}
1915
1916	/**
1917	* @interface_method_impl{PDMIHGCMPORT,pfnIsCmdCancelled}
1918	*/
1919	DECLCALLBACK(bool) hgcmR3IsCmdCancelled(PPDMIHGCMPORT pInterface, PVBOXHGCMCMD pCmd)
1920	{
1921	RT_NOREF(pInterface);
1922	return pCmd && pCmd->fCancelled;
1923	}
1924
1925	/**
1926	* @interface_method_impl{PDMIHGCMPORT,pfnGetRequestor}
1927	*/
1928	DECLCALLBACK(uint32_t) hgcmR3GetRequestor(PPDMIHGCMPORT pInterface, PVBOXHGCMCMD pCmd)
1929	{
1930	PVMMDEVCC pThisCC = RT_FROM_MEMBER(pInterface, VMMDEVCC, IHGCMPort);
1931	PVMMDEV pThis = PDMDEVINS_2_DATA(pThisCC->pDevIns, PVMMDEV);
1932	AssertPtrReturn(pCmd, VMMDEV_REQUESTOR_LOWEST);
1933	if (pThis->guestInfo2.fFeatures & VBOXGSTINFO2_F_REQUESTOR_INFO)
1934	return pCmd->fRequestor;
1935	return VMMDEV_REQUESTOR_LEGACY;
1936	}
1937
1938	/**
1939	* @interface_method_impl{PDMIHGCMPORT,pfnGetVMMDevSessionId}
1940	*/
1941	DECLCALLBACK(uint64_t) hgcmR3GetVMMDevSessionId(PPDMIHGCMPORT pInterface)
1942	{
1943	PVMMDEVCC pThisCC = RT_FROM_MEMBER(pInterface, VMMDEVCC, IHGCMPort);
1944	PVMMDEV pThis = PDMDEVINS_2_DATA(pThisCC->pDevIns, PVMMDEV);
1945	return pThis->idSession;
1946	}
1947
1948	/** Save information about pending HGCM requests from pThisCC->listHGCMCmd.
1949	*
1950	* @returns VBox status code that the guest should see.
1951	* @param pThisCC The VMMDev ring-3 instance data.
1952	* @param pSSM SSM handle for SSM functions.
1953	*
1954	* @thread EMT
1955	*/
1956	int vmmdevR3HgcmSaveState(PVMMDEVCC pThisCC, PSSMHANDLE pSSM)
1957	{
1958	PCPDMDEVHLPR3 pHlp = pThisCC->pDevIns->pHlpR3;
1959
1960	LogFlowFunc(("\n"));
1961
1962	/* Compute how many commands are pending. */
1963	uint32_t cCmds = 0;
1964	PVBOXHGCMCMD pCmd;
1965	RTListForEach(&pThisCC->listHGCMCmd, pCmd, VBOXHGCMCMD, node)
1966	{
1967	LogFlowFunc(("pCmd %p\n", pCmd));
1968	++cCmds;
1969	}
1970	LogFlowFunc(("cCmds = %d\n", cCmds));
1971
1972	/* Save number of commands. */
1973	int rc = pHlp->pfnSSMPutU32(pSSM, cCmds);
1974	AssertRCReturn(rc, rc);
1975
1976	if (cCmds > 0)
1977	{
1978	RTListForEach(&pThisCC->listHGCMCmd, pCmd, VBOXHGCMCMD, node)
1979	{
1980	LogFlowFunc(("Saving %RGp, size %d\n", pCmd->GCPhys, pCmd->cbRequest));
1981
1982	/** @todo Don't save cancelled requests! It serves no purpose. See restore and
1983	* @bugref{4032#c4} for details. */
1984	pHlp->pfnSSMPutU32 (pSSM, (uint32_t)pCmd->enmCmdType);
1985	pHlp->pfnSSMPutBool (pSSM, pCmd->fCancelled);
1986	pHlp->pfnSSMPutGCPhys (pSSM, pCmd->GCPhys);
1987	pHlp->pfnSSMPutU32 (pSSM, pCmd->cbRequest);
1988	pHlp->pfnSSMPutU32 (pSSM, (uint32_t)pCmd->enmRequestType);
1989	const uint32_t cParms = pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL ? pCmd->u.call.cParms : 0;
1990	rc = pHlp->pfnSSMPutU32(pSSM, cParms);
1991	AssertRCReturn(rc, rc);
1992
1993	if (pCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL)
1994	{
1995	pHlp->pfnSSMPutU32 (pSSM, pCmd->u.call.u32ClientID);
1996	rc = pHlp->pfnSSMPutU32(pSSM, pCmd->u.call.u32Function);
1997	AssertRCReturn(rc, rc);
1998
1999	/* Guest parameters. */
2000	uint32_t i;
2001	for (i = 0; i < pCmd->u.call.cParms; ++i)
2002	{
2003	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
2004
2005	rc = pHlp->pfnSSMPutU32(pSSM, (uint32_t)pGuestParm->enmType);
2006	AssertRCReturn(rc, rc);
2007
2008	if ( pGuestParm->enmType == VMMDevHGCMParmType_32bit
2009	\|\| pGuestParm->enmType == VMMDevHGCMParmType_64bit)
2010	{
2011	const VBOXHGCMPARMVAL * const pVal = &pGuestParm->u.val;
2012	pHlp->pfnSSMPutU64 (pSSM, pVal->u64Value);
2013	pHlp->pfnSSMPutU32 (pSSM, pVal->offValue);
2014	rc = pHlp->pfnSSMPutU32(pSSM, pVal->cbValue);
2015	}
2016	else if ( pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_In
2017	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_Out
2018	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr
2019	\|\| pGuestParm->enmType == VMMDevHGCMParmType_PageList
2020	\|\| pGuestParm->enmType == VMMDevHGCMParmType_Embedded
2021	\|\| pGuestParm->enmType == VMMDevHGCMParmType_ContiguousPageList)
2022	{
2023	const VBOXHGCMPARMPTR * const pPtr = &pGuestParm->u.ptr;
2024	pHlp->pfnSSMPutU32 (pSSM, pPtr->cbData);
2025	pHlp->pfnSSMPutU32 (pSSM, pPtr->offFirstPage);
2026	pHlp->pfnSSMPutU32 (pSSM, pPtr->cPages);
2027	rc = pHlp->pfnSSMPutU32(pSSM, pPtr->fu32Direction);
2028
2029	uint32_t iPage;
2030	for (iPage = 0; RT_SUCCESS(rc) && iPage < pPtr->cPages; ++iPage)
2031	rc = pHlp->pfnSSMPutGCPhys(pSSM, pPtr->paPages[iPage]);
2032	}
2033	else if (pGuestParm->enmType == VMMDevHGCMParmType_NoBouncePageList)
2034	{
2035	/* We don't have the page addresses here, so it will need to be
2036	restored from guest memory. This isn't an issue as it is only
2037	use with services which won't survive a save/restore anyway. */
2038	}
2039	else
2040	{
2041	AssertFailedStmt(rc = VERR_INTERNAL_ERROR);
2042	}
2043	AssertRCReturn(rc, rc);
2044	}
2045	}
2046	else if (pCmd->enmCmdType == VBOXHGCMCMDTYPE_CONNECT)
2047	{
2048	pHlp->pfnSSMPutU32(pSSM, pCmd->u.connect.u32ClientID);
2049	pHlp->pfnSSMPutMem(pSSM, pCmd->u.connect.pLoc, sizeof(*pCmd->u.connect.pLoc));
2050	}
2051	else if (pCmd->enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT)
2052	{
2053	pHlp->pfnSSMPutU32(pSSM, pCmd->u.disconnect.u32ClientID);
2054	}
2055	else
2056	{
2057	AssertFailedReturn(VERR_INTERNAL_ERROR);
2058	}
2059
2060	/* A reserved field, will allow to extend saved data for a command. */
2061	rc = pHlp->pfnSSMPutU32(pSSM, 0);
2062	AssertRCReturn(rc, rc);
2063	}
2064	}
2065
2066	/* A reserved field, will allow to extend saved data for VMMDevHGCM. */
2067	rc = pHlp->pfnSSMPutU32(pSSM, 0);
2068	AssertRCReturn(rc, rc);
2069
2070	return rc;
2071	}
2072
2073	/** Load information about pending HGCM requests.
2074	*
2075	* Allocate VBOXHGCMCMD commands and add them to pThisCC->listHGCMCmd
2076	* temporarily. vmmdevR3HgcmLoadStateDone will process the temporary list. This
2077	* includes loading the correct fRequestor fields.
2078	*
2079	* @returns VBox status code that the guest should see.
2080	* @param pDevIns The device instance.
2081	* @param pThis The VMMDev shared instance data.
2082	* @param pThisCC The VMMDev ring-3 instance data.
2083	* @param pSSM SSM handle for SSM functions.
2084	* @param uVersion Saved state version.
2085	*
2086	* @thread EMT
2087	*/
2088	int vmmdevR3HgcmLoadState(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, PSSMHANDLE pSSM, uint32_t uVersion)
2089	{
2090	PCPDMDEVHLPR3 pHlp = pDevIns->pHlpR3;
2091
2092	LogFlowFunc(("\n"));
2093
2094	pThisCC->uSavedStateVersion = uVersion; /* For vmmdevR3HgcmLoadStateDone */
2095
2096	/* Read how many commands were pending. */
2097	uint32_t cCmds = 0;
2098	int rc = pHlp->pfnSSMGetU32(pSSM, &cCmds);
2099	AssertRCReturn(rc, rc);
2100
2101	LogFlowFunc(("cCmds = %d\n", cCmds));
2102
2103	if (uVersion >= VMMDEV_SAVED_STATE_VERSION_HGCM_PARAMS)
2104	{
2105	/* Saved information about all HGCM parameters. */
2106	uint32_t u32;
2107
2108	uint32_t iCmd;
2109	for (iCmd = 0; iCmd < cCmds; ++iCmd)
2110	{
2111	/* Command fields. */
2112	VBOXHGCMCMDTYPE enmCmdType;
2113	bool fCancelled;
2114	RTGCPHYS GCPhys;
2115	uint32_t cbRequest;
2116	VMMDevRequestType enmRequestType;
2117	uint32_t cParms;
2118
2119	pHlp->pfnSSMGetU32 (pSSM, &u32);
2120	enmCmdType = (VBOXHGCMCMDTYPE)u32;
2121	pHlp->pfnSSMGetBool (pSSM, &fCancelled);
2122	pHlp->pfnSSMGetGCPhys (pSSM, &GCPhys);
2123	pHlp->pfnSSMGetU32 (pSSM, &cbRequest);
2124	pHlp->pfnSSMGetU32 (pSSM, &u32);
2125	enmRequestType = (VMMDevRequestType)u32;
2126	rc = pHlp->pfnSSMGetU32(pSSM, &cParms);
2127	AssertRCReturn(rc, rc);
2128
2129	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, enmCmdType, GCPhys, cbRequest, cParms, 0 /fRequestor/);
2130	AssertReturn(pCmd, VERR_NO_MEMORY);
2131
2132	pCmd->fCancelled = fCancelled;
2133	pCmd->GCPhys = GCPhys;
2134	pCmd->cbRequest = cbRequest;
2135	pCmd->enmRequestType = enmRequestType;
2136
2137	if (enmCmdType == VBOXHGCMCMDTYPE_CALL)
2138	{
2139	pHlp->pfnSSMGetU32 (pSSM, &pCmd->u.call.u32ClientID);
2140	rc = pHlp->pfnSSMGetU32(pSSM, &pCmd->u.call.u32Function);
2141	AssertRCReturn(rc, rc);
2142
2143	/* Guest parameters. */
2144	uint32_t i;
2145	for (i = 0; i < cParms; ++i)
2146	{
2147	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[i];
2148
2149	rc = pHlp->pfnSSMGetU32(pSSM, &u32);
2150	AssertRCReturn(rc, rc);
2151	pGuestParm->enmType = (HGCMFunctionParameterType)u32;
2152
2153	if ( pGuestParm->enmType == VMMDevHGCMParmType_32bit
2154	\|\| pGuestParm->enmType == VMMDevHGCMParmType_64bit)
2155	{
2156	VBOXHGCMPARMVAL * const pVal = &pGuestParm->u.val;
2157	pHlp->pfnSSMGetU64 (pSSM, &pVal->u64Value);
2158	pHlp->pfnSSMGetU32 (pSSM, &pVal->offValue);
2159	rc = pHlp->pfnSSMGetU32(pSSM, &pVal->cbValue);
2160	}
2161	else if ( pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_In
2162	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_Out
2163	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr
2164	\|\| pGuestParm->enmType == VMMDevHGCMParmType_PageList
2165	\|\| pGuestParm->enmType == VMMDevHGCMParmType_Embedded
2166	\|\| pGuestParm->enmType == VMMDevHGCMParmType_ContiguousPageList)
2167	{
2168	VBOXHGCMPARMPTR * const pPtr = &pGuestParm->u.ptr;
2169	pHlp->pfnSSMGetU32 (pSSM, &pPtr->cbData);
2170	pHlp->pfnSSMGetU32 (pSSM, &pPtr->offFirstPage);
2171	pHlp->pfnSSMGetU32 (pSSM, &pPtr->cPages);
2172	rc = pHlp->pfnSSMGetU32(pSSM, &pPtr->fu32Direction);
2173	if (RT_SUCCESS(rc))
2174	{
2175	if (pPtr->cPages == 1)
2176	pPtr->paPages = &pPtr->GCPhysSinglePage;
2177	else
2178	{
2179	AssertReturn( pGuestParm->enmType != VMMDevHGCMParmType_Embedded
2180	&& pGuestParm->enmType != VMMDevHGCMParmType_ContiguousPageList, VERR_INTERNAL_ERROR_3);
2181	pPtr->paPages = (RTGCPHYS *)vmmdevR3HgcmCallMemAlloc(pThisCC, pCmd,
2182	pPtr->cPages * sizeof(RTGCPHYS));
2183	AssertStmt(pPtr->paPages, rc = VERR_NO_MEMORY);
2184	}
2185
2186	if (RT_SUCCESS(rc))
2187	{
2188	uint32_t iPage;
2189	for (iPage = 0; iPage < pPtr->cPages; ++iPage)
2190	rc = pHlp->pfnSSMGetGCPhys(pSSM, &pPtr->paPages[iPage]);
2191	}
2192	}
2193	}
2194	else if (pGuestParm->enmType == VMMDevHGCMParmType_NoBouncePageList)
2195	{
2196	/* This request type can only be stored from guest memory for now. */
2197	pCmd->fRestoreFromGuestMem = true;
2198	}
2199	else
2200	{
2201	AssertFailedStmt(rc = VERR_INTERNAL_ERROR);
2202	}
2203	AssertRCReturn(rc, rc);
2204	}
2205	}
2206	else if (enmCmdType == VBOXHGCMCMDTYPE_CONNECT)
2207	{
2208	pHlp->pfnSSMGetU32(pSSM, &pCmd->u.connect.u32ClientID);
2209	rc = pHlp->pfnSSMGetMem(pSSM, pCmd->u.connect.pLoc, sizeof(*pCmd->u.connect.pLoc));
2210	AssertRCReturn(rc, rc);
2211	}
2212	else if (enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT)
2213	{
2214	rc = pHlp->pfnSSMGetU32(pSSM, &pCmd->u.disconnect.u32ClientID);
2215	AssertRCReturn(rc, rc);
2216	}
2217	else
2218	{
2219	AssertFailedReturn(VERR_INTERNAL_ERROR);
2220	}
2221
2222	/* A reserved field, will allow to extend saved data for a command. */
2223	rc = pHlp->pfnSSMGetU32(pSSM, &u32);
2224	AssertRCReturn(rc, rc);
2225
2226	/*
2227	* Do not restore cancelled calls. Why do we save them to start with?
2228	*
2229	* The guest memory no longer contains a valid request! So, it is not
2230	* possible to restore it. The memory is often reused for a new request
2231	* by now and we will end up trying to complete that more than once if
2232	* we restore a cancelled call. In some cases VERR_HGCM_INVALID_CLIENT_ID
2233	* is returned, though it might just be silent memory corruption.
2234	*/
2235	/* See current version above. */
2236	if (!fCancelled)
2237	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2238	else
2239	{
2240	Log(("vmmdevR3HgcmLoadState: Skipping cancelled request: enmCmdType=%d GCPhys=%#RX32 LB %#x\n",
2241	enmCmdType, GCPhys, cbRequest));
2242	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2243	}
2244	}
2245
2246	/* A reserved field, will allow to extend saved data for VMMDevHGCM. */
2247	rc = pHlp->pfnSSMGetU32(pSSM, &u32);
2248	AssertRCReturn(rc, rc);
2249	}
2250	else if (uVersion >= 9)
2251	{
2252	/* Version 9+: Load information about commands. Pre-rewrite. */
2253	uint32_t u32;
2254
2255	uint32_t iCmd;
2256	for (iCmd = 0; iCmd < cCmds; ++iCmd)
2257	{
2258	VBOXHGCMCMDTYPE enmCmdType;
2259	bool fCancelled;
2260	RTGCPHYS GCPhys;
2261	uint32_t cbRequest;
2262	uint32_t cLinAddrs;
2263
2264	pHlp->pfnSSMGetGCPhys (pSSM, &GCPhys);
2265	rc = pHlp->pfnSSMGetU32(pSSM, &cbRequest);
2266	AssertRCReturn(rc, rc);
2267
2268	LogFlowFunc(("Restoring %RGp size %x bytes\n", GCPhys, cbRequest));
2269
2270	/* For uVersion <= 12, this was the size of entire command.
2271	* Now the command is reconstructed in vmmdevR3HgcmLoadStateDone.
2272	*/
2273	if (uVersion <= 12)
2274	pHlp->pfnSSMSkip(pSSM, sizeof (uint32_t));
2275
2276	pHlp->pfnSSMGetU32 (pSSM, &u32);
2277	enmCmdType = (VBOXHGCMCMDTYPE)u32;
2278	pHlp->pfnSSMGetBool (pSSM, &fCancelled);
2279	/* How many linear pointers. Always 0 if not a call command. */
2280	rc = pHlp->pfnSSMGetU32(pSSM, &cLinAddrs);
2281	AssertRCReturn(rc, rc);
2282
2283	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, enmCmdType, GCPhys, cbRequest, cLinAddrs, 0 /fRequestor/);
2284	AssertReturn(pCmd, VERR_NO_MEMORY);
2285
2286	pCmd->fCancelled = fCancelled;
2287	pCmd->GCPhys = GCPhys;
2288	pCmd->cbRequest = cbRequest;
2289
2290	if (cLinAddrs > 0)
2291	{
2292	/* Skip number of pages for all LinAddrs in this command. */
2293	pHlp->pfnSSMSkip(pSSM, sizeof(uint32_t));
2294
2295	uint32_t i;
2296	for (i = 0; i < cLinAddrs; ++i)
2297	{
2298	VBOXHGCMPARMPTR * const pPtr = &pCmd->u.call.paGuestParms[i].u.ptr;
2299
2300	/* Index of the parameter. Use cbData field to store the index. */
2301	pHlp->pfnSSMGetU32 (pSSM, &pPtr->cbData);
2302	pHlp->pfnSSMGetU32 (pSSM, &pPtr->offFirstPage);
2303	rc = pHlp->pfnSSMGetU32(pSSM, &pPtr->cPages);
2304	AssertRCReturn(rc, rc);
2305
2306	pPtr->paPages = (RTGCPHYS )vmmdevR3HgcmCallMemAlloc(pThisCC, pCmd, pPtr->cPages sizeof(RTGCPHYS));
2307	AssertReturn(pPtr->paPages, VERR_NO_MEMORY);
2308
2309	uint32_t iPage;
2310	for (iPage = 0; iPage < pPtr->cPages; ++iPage)
2311	rc = pHlp->pfnSSMGetGCPhys(pSSM, &pPtr->paPages[iPage]);
2312	}
2313	}
2314
2315	/* A reserved field, will allow to extend saved data for a command. */
2316	rc = pHlp->pfnSSMGetU32(pSSM, &u32);
2317	AssertRCReturn(rc, rc);
2318
2319	/* See current version above. */
2320	if (!fCancelled)
2321	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2322	else
2323	{
2324	Log(("vmmdevR3HgcmLoadState: Skipping cancelled request: enmCmdType=%d GCPhys=%#RX32 LB %#x\n",
2325	enmCmdType, GCPhys, cbRequest));
2326	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2327	}
2328	}
2329
2330	/* A reserved field, will allow to extend saved data for VMMDevHGCM. */
2331	rc = pHlp->pfnSSMGetU32(pSSM, &u32);
2332	AssertRCReturn(rc, rc);
2333	}
2334	else
2335	{
2336	/* Ancient. Only the guest physical address is saved. */
2337	uint32_t iCmd;
2338	for (iCmd = 0; iCmd < cCmds; ++iCmd)
2339	{
2340	RTGCPHYS GCPhys;
2341	uint32_t cbRequest;
2342
2343	pHlp->pfnSSMGetGCPhys(pSSM, &GCPhys);
2344	rc = pHlp->pfnSSMGetU32(pSSM, &cbRequest);
2345	AssertRCReturn(rc, rc);
2346
2347	LogFlowFunc(("Restoring %RGp size %x bytes\n", GCPhys, cbRequest));
2348
2349	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_LOADSTATE, GCPhys, cbRequest, 0, 0 /fRequestor/);
2350	AssertReturn(pCmd, VERR_NO_MEMORY);
2351
2352	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2353	}
2354	}
2355
2356	return rc;
2357	}
2358
2359	/** Restore HGCM connect command loaded from old saved state.
2360	*
2361	* @returns VBox status code that the guest should see.
2362	* @param pThisCC The VMMDev ring-3 instance data.
2363	* @param uSavedStateVersion The saved state version the command has been loaded from.
2364	* @param pLoadedCmd Command loaded from saved state, it is imcomplete and needs restoration.
2365	* @param pReq The guest request (cached in host memory).
2366	* @param cbReq Size of the guest request.
2367	* @param enmRequestType Type of the HGCM request.
2368	* @param ppRestoredCmd Where to store pointer to newly allocated restored command.
2369	*/
2370	static int vmmdevR3HgcmRestoreConnect(PVMMDEVCC pThisCC, uint32_t uSavedStateVersion, const VBOXHGCMCMD *pLoadedCmd,
2371	VMMDevHGCMConnect *pReq, uint32_t cbReq, VMMDevRequestType enmRequestType,
2372	VBOXHGCMCMD **ppRestoredCmd)
2373	{
2374	/* Verify the request. */
2375	ASSERT_GUEST_RETURN(cbReq >= sizeof(*pReq), VERR_MISMATCH);
2376	if (uSavedStateVersion >= 9)
2377	ASSERT_GUEST_RETURN(pLoadedCmd->enmCmdType == VBOXHGCMCMDTYPE_CONNECT, VERR_MISMATCH);
2378
2379	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_CONNECT, pLoadedCmd->GCPhys, cbReq, 0,
2380	pReq->header.header.fRequestor);
2381	AssertReturn(pCmd, VERR_NO_MEMORY);
2382
2383	Assert(pLoadedCmd->fCancelled == false);
2384	pCmd->fCancelled = false;
2385	pCmd->fRestored = true;
2386	pCmd->enmRequestType = enmRequestType;
2387
2388	vmmdevR3HgcmConnectFetch(pReq, pCmd);
2389
2390	*ppRestoredCmd = pCmd;
2391	return VINF_SUCCESS;
2392	}
2393
2394	/** Restore HGCM disconnect command loaded from old saved state.
2395	*
2396	* @returns VBox status code that the guest should see.
2397	* @param pThisCC The VMMDev ring-3 instance data.
2398	* @param uSavedStateVersion The saved state version the command has been loaded from.
2399	* @param pLoadedCmd Command loaded from saved state, it is imcomplete and needs restoration.
2400	* @param pReq The guest request (cached in host memory).
2401	* @param cbReq Size of the guest request.
2402	* @param enmRequestType Type of the HGCM request.
2403	* @param ppRestoredCmd Where to store pointer to newly allocated restored command.
2404	*/
2405	static int vmmdevR3HgcmRestoreDisconnect(PVMMDEVCC pThisCC, uint32_t uSavedStateVersion, const VBOXHGCMCMD *pLoadedCmd,
2406	VMMDevHGCMDisconnect *pReq, uint32_t cbReq, VMMDevRequestType enmRequestType,
2407	VBOXHGCMCMD **ppRestoredCmd)
2408	{
2409	/* Verify the request. */
2410	ASSERT_GUEST_RETURN(cbReq >= sizeof(*pReq), VERR_MISMATCH);
2411	if (uSavedStateVersion >= 9)
2412	ASSERT_GUEST_RETURN(pLoadedCmd->enmCmdType == VBOXHGCMCMDTYPE_DISCONNECT, VERR_MISMATCH);
2413
2414	PVBOXHGCMCMD pCmd = vmmdevR3HgcmCmdAlloc(pThisCC, VBOXHGCMCMDTYPE_DISCONNECT, pLoadedCmd->GCPhys, cbReq, 0,
2415	pReq->header.header.fRequestor);
2416	AssertReturn(pCmd, VERR_NO_MEMORY);
2417
2418	Assert(pLoadedCmd->fCancelled == false);
2419	pCmd->fCancelled = false;
2420	pCmd->fRestored = true;
2421	pCmd->enmRequestType = enmRequestType;
2422
2423	vmmdevR3HgcmDisconnectFetch(pReq, pCmd);
2424
2425	*ppRestoredCmd = pCmd;
2426	return VINF_SUCCESS;
2427	}
2428
2429	/** Restore HGCM call command loaded from old saved state.
2430	*
2431	* @returns VBox status code that the guest should see.
2432	* @param pDevIns The device instance.
2433	* @param pThis The VMMDev shared instance data.
2434	* @param pThisCC The VMMDev ring-3 instance data.
2435	* @param uSavedStateVersion The saved state version the command has been loaded from.
2436	* @param pLoadedCmd Command loaded from saved state, it is imcomplete and needs restoration.
2437	* @param pReq The guest request (cached in host memory).
2438	* @param cbReq Size of the guest request.
2439	* @param enmRequestType Type of the HGCM request.
2440	* @param ppRestoredCmd Where to store pointer to newly allocated restored command.
2441	*/
2442	static int vmmdevR3HgcmRestoreCall(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, uint32_t uSavedStateVersion,
2443	const VBOXHGCMCMD pLoadedCmd, VMMDevHGCMCall pReq, uint32_t cbReq,
2444	VMMDevRequestType enmRequestType, VBOXHGCMCMD **ppRestoredCmd)
2445	{
2446	/* Verify the request. */
2447	ASSERT_GUEST_RETURN(cbReq >= sizeof(*pReq), VERR_MISMATCH);
2448	if (uSavedStateVersion >= 9)
2449	{
2450	ASSERT_GUEST_RETURN(pLoadedCmd->enmCmdType == VBOXHGCMCMDTYPE_CALL, VERR_MISMATCH);
2451	Assert(pLoadedCmd->fCancelled == false);
2452	}
2453
2454	PVBOXHGCMCMD pCmd;
2455	uint32_t cbHGCMParmStruct;
2456	int rc = vmmdevR3HgcmCallAlloc(pThisCC, pReq, cbReq, pLoadedCmd->GCPhys, enmRequestType, &pCmd, &cbHGCMParmStruct);
2457	if (RT_FAILURE(rc))
2458	return rc;
2459
2460	/* pLoadedCmd is fake, it does not contain actual call parameters. Only pagelists for LinAddr. */
2461	pCmd->fCancelled = false;
2462	pCmd->fRestored = true;
2463	pCmd->enmRequestType = enmRequestType;
2464
2465	rc = vmmdevR3HgcmCallFetchGuestParms(pDevIns, pThisCC, pCmd, pReq, cbReq, enmRequestType, cbHGCMParmStruct);
2466	if (RT_SUCCESS(rc))
2467	{
2468	/* Update LinAddr parameters from pLoadedCmd.
2469	* pLoadedCmd->u.call.cParms is actually the number of LinAddrs, see vmmdevR3HgcmLoadState.
2470	*/
2471	uint32_t iLinAddr;
2472	for (iLinAddr = 0; iLinAddr < pLoadedCmd->u.call.cParms; ++iLinAddr)
2473	{
2474	VBOXHGCMGUESTPARM * const pLoadedParm = &pLoadedCmd->u.call.paGuestParms[iLinAddr];
2475	/* pLoadedParm->cbData is actually index of the LinAddr parameter, see vmmdevR3HgcmLoadState. */
2476	const uint32_t iParm = pLoadedParm->u.ptr.cbData;
2477	ASSERT_GUEST_STMT_BREAK(iParm < pCmd->u.call.cParms, rc = VERR_MISMATCH);
2478
2479	VBOXHGCMGUESTPARM * const pGuestParm = &pCmd->u.call.paGuestParms[iParm];
2480	ASSERT_GUEST_STMT_BREAK( pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_In
2481	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr_Out
2482	\|\| pGuestParm->enmType == VMMDevHGCMParmType_LinAddr,
2483	rc = VERR_MISMATCH);
2484	ASSERT_GUEST_STMT_BREAK( pLoadedParm->u.ptr.offFirstPage == pGuestParm->u.ptr.offFirstPage
2485	&& pLoadedParm->u.ptr.cPages == pGuestParm->u.ptr.cPages,
2486	rc = VERR_MISMATCH);
2487	memcpy(pGuestParm->u.ptr.paPages, pLoadedParm->u.ptr.paPages, pGuestParm->u.ptr.cPages * sizeof(RTGCPHYS));
2488	}
2489	}
2490
2491	if (RT_SUCCESS(rc))
2492	*ppRestoredCmd = pCmd;
2493	else
2494	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2495
2496	return rc;
2497	}
2498
2499	/** Allocate and initialize a HGCM command using the given request (pReqHdr)
2500	* and command loaded from saved state (pCmd).
2501	*
2502	* @returns VBox status code that the guest should see.
2503	* @param pDevIns The device instance.
2504	* @param pThis The VMMDev shared instance data.
2505	* @param pThisCC The VMMDev ring-3 instance data.
2506	* @param uSavedStateVersion Saved state version.
2507	* @param pLoadedCmd HGCM command which needs restoration.
2508	* @param pReqHdr The request (cached in host memory).
2509	* @param cbReq Size of the entire request (including HGCM parameters).
2510	* @param ppRestoredCmd Where to store pointer to restored command.
2511	*/
2512	static int vmmdevR3HgcmRestoreCommand(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC, uint32_t uSavedStateVersion,
2513	const VBOXHGCMCMD pLoadedCmd, const VMMDevHGCMRequestHeader pReqHdr, uint32_t cbReq,
2514	VBOXHGCMCMD **ppRestoredCmd)
2515	{
2516	int rc;
2517
2518	/* Verify the request. */
2519	ASSERT_GUEST_RETURN(cbReq >= sizeof(VMMDevHGCMRequestHeader), VERR_MISMATCH);
2520	ASSERT_GUEST_RETURN(cbReq == pReqHdr->header.size, VERR_MISMATCH);
2521
2522	const VMMDevRequestType enmRequestType = pReqHdr->header.requestType;
2523	switch (enmRequestType)
2524	{
2525	case VMMDevReq_HGCMConnect:
2526	{
2527	VMMDevHGCMConnect pReq = (VMMDevHGCMConnect )pReqHdr;
2528	rc = vmmdevR3HgcmRestoreConnect(pThisCC, uSavedStateVersion, pLoadedCmd, pReq, cbReq, enmRequestType, ppRestoredCmd);
2529	break;
2530	}
2531
2532	case VMMDevReq_HGCMDisconnect:
2533	{
2534	VMMDevHGCMDisconnect pReq = (VMMDevHGCMDisconnect )pReqHdr;
2535	rc = vmmdevR3HgcmRestoreDisconnect(pThisCC, uSavedStateVersion, pLoadedCmd, pReq, cbReq, enmRequestType, ppRestoredCmd);
2536	break;
2537	}
2538
2539	#ifdef VBOX_WITH_64_BITS_GUESTS
2540	case VMMDevReq_HGCMCall64:
2541	#endif
2542	case VMMDevReq_HGCMCall32:
2543	{
2544	VMMDevHGCMCall pReq = (VMMDevHGCMCall )pReqHdr;
2545	rc = vmmdevR3HgcmRestoreCall(pDevIns, pThis, pThisCC, uSavedStateVersion, pLoadedCmd,
2546	pReq, cbReq, enmRequestType, ppRestoredCmd);
2547	break;
2548	}
2549
2550	default:
2551	ASSERT_GUEST_FAILED_RETURN(VERR_MISMATCH);
2552	}
2553
2554	return rc;
2555	}
2556
2557	/** Resubmit pending HGCM commands which were loaded form saved state.
2558	*
2559	* @returns VBox status code.
2560	* @param pDevIns The device instance.
2561	* @param pThis The VMMDev shared instance data.
2562	* @param pThisCC The VMMDev ring-3 instance data.
2563	*
2564	* @thread EMT
2565	*/
2566	int vmmdevR3HgcmLoadStateDone(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC)
2567	{
2568	/*
2569	* Resubmit pending HGCM commands to services.
2570	*
2571	* pThisCC->pHGCMCmdList contains commands loaded by vmmdevR3HgcmLoadState.
2572	*
2573	* Legacy saved states (pre VMMDEV_SAVED_STATE_VERSION_HGCM_PARAMS)
2574	* do not have enough information about the command parameters,
2575	* therefore it is necessary to reload at least some data from the
2576	* guest memory to construct commands.
2577	*
2578	* There are two types of legacy saved states which contain:
2579	* 1) the guest physical address and size of request;
2580	* 2) additionally page lists for LinAddr parameters.
2581	*
2582	* Legacy commands have enmCmdType = VBOXHGCMCMDTYPE_LOADSTATE?
2583	*/
2584
2585	int rcFunc = VINF_SUCCESS; /* This status code will make the function fail. I.e. VM will not start. */
2586
2587	/* Get local copy of the list of loaded commands. */
2588	RTLISTANCHOR listLoadedCommands;
2589	RTListMove(&listLoadedCommands, &pThisCC->listHGCMCmd);
2590
2591	/* Resubmit commands. */
2592	PVBOXHGCMCMD pCmd, pNext;
2593	RTListForEachSafe(&listLoadedCommands, pCmd, pNext, VBOXHGCMCMD, node)
2594	{
2595	int rcCmd = VINF_SUCCESS; /* This status code will make the HGCM command fail for the guest. */
2596
2597	RTListNodeRemove(&pCmd->node);
2598
2599	/*
2600	* Re-read the request from the guest memory.
2601	* It will be used to:
2602	* * reconstruct commands if legacy saved state has been restored;
2603	* * report an error to the guest if resubmit failed.
2604	*/
2605	VMMDevHGCMRequestHeader pReqHdr = (VMMDevHGCMRequestHeader )RTMemAlloc(pCmd->cbRequest);
2606	AssertBreakStmt(pReqHdr, vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd); rcFunc = VERR_NO_MEMORY);
2607
2608	PDMDevHlpPhysRead(pDevIns, pCmd->GCPhys, pReqHdr, pCmd->cbRequest);
2609	RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
2610
2611	if (pThisCC->pHGCMDrv)
2612	{
2613	/*
2614	* Reconstruct legacy commands.
2615	*/
2616	if (RT_LIKELY( pThisCC->uSavedStateVersion >= VMMDEV_SAVED_STATE_VERSION_HGCM_PARAMS
2617	&& !pCmd->fRestoreFromGuestMem))
2618	{ /* likely */ }
2619	else
2620	{
2621	PVBOXHGCMCMD pRestoredCmd = NULL;
2622	rcCmd = vmmdevR3HgcmRestoreCommand(pDevIns, pThis, pThisCC, pThisCC->uSavedStateVersion, pCmd,
2623	pReqHdr, pCmd->cbRequest, &pRestoredCmd);
2624	if (RT_SUCCESS(rcCmd))
2625	{
2626	Assert(pCmd != pRestoredCmd); /* vmmdevR3HgcmRestoreCommand must allocate restored command. */
2627	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2628	pCmd = pRestoredCmd;
2629	}
2630	}
2631
2632	/* Resubmit commands. */
2633	if (RT_SUCCESS(rcCmd))
2634	{
2635	switch (pCmd->enmCmdType)
2636	{
2637	case VBOXHGCMCMDTYPE_CONNECT:
2638	{
2639	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2640	rcCmd = pThisCC->pHGCMDrv->pfnConnect(pThisCC->pHGCMDrv, pCmd, pCmd->u.connect.pLoc,
2641	&pCmd->u.connect.u32ClientID);
2642	if (RT_FAILURE(rcCmd))
2643	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
2644	break;
2645	}
2646
2647	case VBOXHGCMCMDTYPE_DISCONNECT:
2648	{
2649	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2650	rcCmd = pThisCC->pHGCMDrv->pfnDisconnect(pThisCC->pHGCMDrv, pCmd, pCmd->u.disconnect.u32ClientID);
2651	if (RT_FAILURE(rcCmd))
2652	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
2653	break;
2654	}
2655
2656	case VBOXHGCMCMDTYPE_CALL:
2657	{
2658	rcCmd = vmmdevR3HgcmInitHostParameters(pDevIns, pThisCC, pCmd, (uint8_t const *)pReqHdr);
2659	if (RT_SUCCESS(rcCmd))
2660	{
2661	vmmdevR3HgcmAddCommand(pDevIns, pThis, pThisCC, pCmd);
2662
2663	/* Pass the function call to HGCM connector for actual processing */
2664	uint64_t tsNow;
2665	STAM_GET_TS(tsNow);
2666	rcCmd = pThisCC->pHGCMDrv->pfnCall(pThisCC->pHGCMDrv, pCmd,
2667	pCmd->u.call.u32ClientID, pCmd->u.call.u32Function,
2668	pCmd->u.call.cParms, pCmd->u.call.paHostParms, tsNow);
2669	if (RT_FAILURE(rcCmd))
2670	{
2671	LogFunc(("pfnCall rc = %Rrc\n", rcCmd));
2672	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
2673	}
2674	}
2675	break;
2676	}
2677
2678	default:
2679	AssertFailedStmt(rcCmd = VERR_INTERNAL_ERROR);
2680	}
2681	}
2682	}
2683	else
2684	AssertFailedStmt(rcCmd = VERR_INTERNAL_ERROR);
2685
2686	if (RT_SUCCESS(rcCmd))
2687	{ /* likely */ }
2688	else
2689	{
2690	/* Return the error to the guest. Guest may try to repeat the call. */
2691	pReqHdr->result = rcCmd;
2692	pReqHdr->header.rc = rcCmd;
2693	pReqHdr->fu32Flags \|= VBOX_HGCM_REQ_DONE;
2694
2695	/* Write back only the header. */
2696	PDMDevHlpPhysWrite(pDevIns, pCmd->GCPhys, pReqHdr, sizeof(*pReqHdr));
2697
2698	VMMDevNotifyGuest(pDevIns, pThis, pThisCC, VMMDEV_EVENT_HGCM);
2699
2700	/* Deallocate the command memory. */
2701	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2702	}
2703
2704	RTMemFree(pReqHdr);
2705	}
2706
2707	if (RT_FAILURE(rcFunc))
2708	{
2709	RTListForEachSafe(&listLoadedCommands, pCmd, pNext, VBOXHGCMCMD, node)
2710	{
2711	RTListNodeRemove(&pCmd->node);
2712	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2713	}
2714	}
2715
2716	return rcFunc;
2717	}
2718
2719
2720	/**
2721	* Counterpart to vmmdevR3HgcmInit().
2722	*
2723	* @param pDevIns The device instance.
2724	* @param pThis The VMMDev shared instance data.
2725	* @param pThisCC The VMMDev ring-3 instance data.
2726	*/
2727	void vmmdevR3HgcmDestroy(PPDMDEVINS pDevIns, PVMMDEV pThis, PVMMDEVCC pThisCC)
2728	{
2729	LogFlowFunc(("\n"));
2730
2731	if (RTCritSectIsInitialized(&pThisCC->critsectHGCMCmdList))
2732	{
2733	PVBOXHGCMCMD pCmd, pNext;
2734	RTListForEachSafe(&pThisCC->listHGCMCmd, pCmd, pNext, VBOXHGCMCMD, node)
2735	{
2736	vmmdevR3HgcmRemoveCommand(pThisCC, pCmd);
2737	vmmdevR3HgcmCmdFree(pDevIns, pThis, pThisCC, pCmd);
2738	}
2739
2740	RTCritSectDelete(&pThisCC->critsectHGCMCmdList);
2741	}
2742
2743	AssertCompile(NIL_RTMEMCACHE == (RTMEMCACHE)0);
2744	if (pThisCC->hHgcmCmdCache != NIL_RTMEMCACHE)
2745	{
2746	RTMemCacheDestroy(pThisCC->hHgcmCmdCache);
2747	pThisCC->hHgcmCmdCache = NIL_RTMEMCACHE;
2748	}
2749	}
2750
2751
2752	/**
2753	* Initializes the HGCM specific state.
2754	*
2755	* Keeps VBOXHGCMCMDCACHED and friends local.
2756	*
2757	* @returns VBox status code.
2758	* @param pThisCC The VMMDev ring-3 instance data.
2759	*/
2760	int vmmdevR3HgcmInit(PVMMDEVCC pThisCC)
2761	{
2762	LogFlowFunc(("\n"));
2763
2764	RTListInit(&pThisCC->listHGCMCmd);
2765
2766	int rc = RTCritSectInit(&pThisCC->critsectHGCMCmdList);
2767	AssertLogRelRCReturn(rc, rc);
2768
2769	rc = RTMemCacheCreate(&pThisCC->hHgcmCmdCache, sizeof(VBOXHGCMCMDCACHED), 64, _1M, NULL, NULL, NULL, 0);
2770	AssertLogRelRCReturn(rc, rc);
2771
2772	pThisCC->u32HGCMEnabled = 0;
2773
2774	return VINF_SUCCESS;
2775	}
2776

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Devices/VMMDev/VMMDevHGCM.cpp@ 102788

Download in other formats: