VMReq.cpp@ 2776

Last change on this file since 2776 was 23, checked in by vboxsync, 18 years ago
string.h & stdio.h + header cleanups.
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File size: 30.2 KB

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1	/* $Id: VMReq.cpp 23 2007-01-15 14:08:28Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_VM
27	#include <VBox/mm.h>
28	#include <VBox/vmm.h>
29	#include "VMInternal.h"
30	#include <VBox/vm.h>
31
32	#include <VBox/err.h>
33	#include <VBox/param.h>
34	#include <VBox/log.h>
35	#include <iprt/assert.h>
36	#include <iprt/asm.h>
37	#include <iprt/string.h>
38	#include <iprt/time.h>
39	#include <iprt/semaphore.h>
40	#include <iprt/thread.h>
41
42
43	/*******************************************************************************
44	* Internal Functions *
45	*******************************************************************************/
46	static int vmR3ReqProcessOne(PVM pVM, PVMREQ pReq);
47
48
49	/**
50	* Allocate and queue a call request.
51	*
52	* If it's desired to poll on the completion of the request set cMillies
53	* to 0 and use VMR3ReqWait() to check for completation. In the other case
54	* use RT_INDEFINITE_WAIT.
55	* The returned request packet must be freed using VMR3ReqFree().
56	*
57	* @returns VBox status code.
58	* Will not return VERR_INTERRUPTED.
59	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
60	*
61	* @param pVM The VM handle.
62	* @param ppReq Where to store the pointer to the request.
63	* This will be NULL or a valid request pointer not matter what happends.
64	* @param cMillies Number of milliseconds to wait for the request to
65	* be completed. Use RT_INDEFINITE_WAIT to only
66	* wait till it's completed.
67	* @param pfnFunction Pointer to the function to call.
68	* @param cArgs Number of arguments following in the ellipsis.
69	* Not possible to pass 64-bit arguments!
70	* @param ... Function arguments.
71	*/
72	VMR3DECL(int) VMR3ReqCall(PVM pVM, PVMREQ *ppReq, unsigned cMillies, PFNRT pfnFunction, unsigned cArgs, ...)
73	{
74	va_list va;
75	va_start(va, cArgs);
76	int rc = VMR3ReqCallV(pVM, ppReq, cMillies, VMREQFLAGS_VBOX_STATUS, pfnFunction, cArgs, va);
77	va_end(va);
78	return rc;
79	}
80
81
82	/**
83	* Allocate and queue a call request to a void function.
84	*
85	* If it's desired to poll on the completion of the request set cMillies
86	* to 0 and use VMR3ReqWait() to check for completation. In the other case
87	* use RT_INDEFINITE_WAIT.
88	* The returned request packet must be freed using VMR3ReqFree().
89	*
90	* @returns VBox status code.
91	* Will not return VERR_INTERRUPTED.
92	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
93	*
94	* @param pVM The VM handle.
95	* @param ppReq Where to store the pointer to the request.
96	* This will be NULL or a valid request pointer not matter what happends.
97	* @param cMillies Number of milliseconds to wait for the request to
98	* be completed. Use RT_INDEFINITE_WAIT to only
99	* wait till it's completed.
100	* @param pfnFunction Pointer to the function to call.
101	* @param cArgs Number of arguments following in the ellipsis.
102	* Not possible to pass 64-bit arguments!
103	* @param ... Function arguments.
104	*/
105	VMR3DECL(int) VMR3ReqCallVoid(PVM pVM, PVMREQ *ppReq, unsigned cMillies, PFNRT pfnFunction, unsigned cArgs, ...)
106	{
107	va_list va;
108	va_start(va, cArgs);
109	int rc = VMR3ReqCallV(pVM, ppReq, cMillies, VMREQFLAGS_VOID, pfnFunction, cArgs, va);
110	va_end(va);
111	return rc;
112	}
113
114
115	/**
116	* Allocate and queue a call request to a void function.
117	*
118	* If it's desired to poll on the completion of the request set cMillies
119	* to 0 and use VMR3ReqWait() to check for completation. In the other case
120	* use RT_INDEFINITE_WAIT.
121	* The returned request packet must be freed using VMR3ReqFree().
122	*
123	* @returns VBox status code.
124	* Will not return VERR_INTERRUPTED.
125	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
126	*
127	* @param pVM The VM handle.
128	* @param ppReq Where to store the pointer to the request.
129	* This will be NULL or a valid request pointer not matter what happends, unless fFlags
130	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
131	* @param cMillies Number of milliseconds to wait for the request to
132	* be completed. Use RT_INDEFINITE_WAIT to only
133	* wait till it's completed.
134	* @param fFlags A combination of the VMREQFLAGS values.
135	* @param pfnFunction Pointer to the function to call.
136	* @param cArgs Number of arguments following in the ellipsis.
137	* Not possible to pass 64-bit arguments!
138	* @param ... Function arguments.
139	*/
140	VMR3DECL(int) VMR3ReqCallEx(PVM pVM, PVMREQ *ppReq, unsigned cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
141	{
142	va_list va;
143	va_start(va, cArgs);
144	int rc = VMR3ReqCallV(pVM, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
145	va_end(va);
146	return rc;
147	}
148
149
150	/**
151	* Allocate and queue a call request.
152	*
153	* If it's desired to poll on the completion of the request set cMillies
154	* to 0 and use VMR3ReqWait() to check for completation. In the other case
155	* use RT_INDEFINITE_WAIT.
156	* The returned request packet must be freed using VMR3ReqFree().
157	*
158	* @returns VBox status code.
159	* Will not return VERR_INTERRUPTED.
160	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
161	*
162	* @param pVM The VM handle.
163	* @param ppReq Where to store the pointer to the request.
164	* This will be NULL or a valid request pointer not matter what happends, unless fFlags
165	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
166	* @param cMillies Number of milliseconds to wait for the request to
167	* be completed. Use RT_INDEFINITE_WAIT to only
168	* wait till it's completed.
169	* @param pfnFunction Pointer to the function to call.
170	* @param fFlags A combination of the VMREQFLAGS values.
171	* @param cArgs Number of arguments following in the ellipsis.
172	* Stuff which differs in size from uintptr_t is gonna make trouble, so don't try!
173	* @param Args Argument vector.
174	*/
175	VMR3DECL(int) VMR3ReqCallV(PVM pVM, PVMREQ *ppReq, unsigned cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, va_list Args)
176	{
177	LogFlow(("VMR3ReqCallV: cMillies=%d fFlags=%#x pfnFunction=%p cArgs=%d\n", cMillies, fFlags, pfnFunction, cArgs));
178
179	/*
180	* Check input.
181	*/
182	if (!pfnFunction \|\| !pVM \|\| (fFlags & ~(VMREQFLAGS_RETURN_MASK \| VMREQFLAGS_NO_WAIT)))
183	{
184	AssertFailed();
185	return VERR_INVALID_PARAMETER;
186	}
187	if (!(fFlags & VMREQFLAGS_NO_WAIT) \|\| ppReq)
188	{
189	Assert(ppReq);
190	*ppReq = NULL;
191	}
192	PVMREQ pReq = NULL;
193	if (cArgs * sizeof(uintptr_t) > sizeof(pReq->u.Internal.aArgs))
194	{
195	AssertMsgFailed(("cArg=%d\n", cArgs));
196	return VERR_TOO_MUCH_DATA;
197	}
198
199	/*
200	* Allocate request
201	*/
202	int rc = VMR3ReqAlloc(pVM, &pReq, VMREQTYPE_INTERNAL);
203	if (VBOX_FAILURE(rc))
204	return rc;
205
206	/*
207	* Initialize the request data.
208	*/
209	pReq->fFlags = fFlags;
210	pReq->u.Internal.pfn = pfnFunction;
211	pReq->u.Internal.cArgs = cArgs;
212	for (unsigned iArg = 0; iArg < cArgs; iArg++)
213	pReq->u.Internal.aArgs[iArg] = va_arg(Args, uintptr_t);
214
215	/*
216	* Queue the request and return.
217	*/
218	rc = VMR3ReqQueue(pReq, cMillies);
219	if ( VBOX_FAILURE(rc)
220	&& rc != VERR_TIMEOUT)
221	{
222	VMR3ReqFree(pReq);
223	pReq = NULL;
224	}
225	if (!(fFlags & VMREQFLAGS_NO_WAIT))
226	{
227	*ppReq = pReq;
228	LogFlow(("VMR3ReqCallV: returns %Vrc *ppReq=%p\n", rc, pReq));
229	}
230	else
231	LogFlow(("VMR3ReqCallV: returns %Vrc\n", rc));
232	Assert(rc != VERR_INTERRUPTED);
233	return rc;
234	}
235
236
237	/**
238	* Joins the list pList with whatever is linked up at *pHead.
239	*/
240	static void vmr3ReqJoinFreeSub(volatile PVMREQ *ppHead, PVMREQ pList)
241	{
242	for (unsigned cIterations = 0;; cIterations++)
243	{
244	PVMREQ pHead = (PVMREQ)ASMAtomicXchgPtr((void * volatile *)ppHead, pList);
245	if (!pHead)
246	return;
247	PVMREQ pTail = pHead;
248	while (pTail->pNext)
249	pTail = pTail->pNext;
250	pTail->pNext = pList;
251	if (ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pHead, pList))
252	return;
253	pTail->pNext = NULL;
254	if (ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pHead, NULL))
255	return;
256	pList = pHead;
257	Assert(cIterations != 32);
258	Assert(cIterations != 64);
259	}
260	}
261
262
263	/**
264	* Joins the list pList with whatever is linked up at *pHead.
265	*/
266	static void vmr3ReqJoinFree(PVMINT pVMInt, PVMREQ pList)
267	{
268	/*
269	* Split the list if it's too long.
270	*/
271	unsigned cReqs = 1;
272	PVMREQ pTail = pList;
273	while (pTail->pNext)
274	{
275	if (cReqs++ > 25)
276	{
277	const uint32_t i = pVMInt->iReqFree;
278	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2) % ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
279
280	pTail->pNext = NULL;
281	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2 + (i == pVMInt->iReqFree)) % ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
282	return;
283	}
284	pTail = pTail->pNext;
285	}
286	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(pVMInt->iReqFree + 2) % ELEMENTS(pVMInt->apReqFree)], pList);
287	}
288
289
290	/**
291	* Allocates a request packet.
292	*
293	* The caller allocates a request packet, fills in the request data
294	* union and queues the request.
295	*
296	* @returns VBox status code.
297	*
298	* @param pVM VM handle.
299	* @param ppReq Where to store the pointer to the allocated packet.
300	* @param enmType Package type.
301	*/
302	VMR3DECL(int) VMR3ReqAlloc(PVM pVM, PVMREQ *ppReq, VMREQTYPE enmType)
303	{
304	/*
305	* Validate input.
306	*/
307	if ( enmType < VMREQTYPE_INVALID
308	\|\| enmType > VMREQTYPE_MAX)
309	{
310	AssertMsgFailed(("Invalid package type %d valid range %d-%d inclusivly.\n",
311	enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1));
312	return VERR_VM_REQUEST_INVALID_TYPE;
313	}
314
315	/*
316	* Try get a recycled packet.
317	* While this could all be solved with a single list with a lock, it's a sport
318	* of mine to avoid locks.
319	*/
320	int cTries = ELEMENTS(pVM->vm.s.apReqFree) * 2;
321	while (--cTries >= 0)
322	{
323	PVMREQ volatile *ppHead = &pVM->vm.s.apReqFree[ASMAtomicIncU32(&pVM->vm.s.iReqFree) % ELEMENTS(pVM->vm.s.apReqFree)];
324	#if 0 /* sad, but this won't work safely because the reading of pReq->pNext. */
325	PVMREQ pNext = NULL;
326	PVMREQ pReq = *ppHead;
327	if ( pReq
328	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, (pNext = pReq->pNext), pReq)
329	&& (pReq = *ppHead)
330	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, (pNext = pReq->pNext), pReq))
331	pReq = NULL;
332	if (pReq)
333	{
334	Assert(pReq->pNext == pNext); NOREF(pReq);
335	#else
336	PVMREQ pReq = (PVMREQ)ASMAtomicXchgPtr((void * volatile *)ppHead, NULL);
337	if (pReq)
338	{
339	PVMREQ pNext = pReq->pNext;
340	if ( pNext
341	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, pNext, NULL))
342	{
343	STAM_COUNTER_INC(&pVM->vm.s.StatReqAllocRaces);
344	vmr3ReqJoinFree(&pVM->vm.s, pReq->pNext);
345	}
346	#endif
347	ASMAtomicDecU32(&pVM->vm.s.cReqFree);
348
349	/*
350	* Make sure the event sem is not signaled.
351	*/
352	if (!pReq->fEventSemClear)
353	{
354	int rc = RTSemEventWait(pReq->EventSem, 0);
355	if (rc != VINF_SUCCESS && rc != VERR_TIMEOUT)
356	{
357	/*
358	* This shall not happen, but if it does we'll just destroy
359	* the semaphore and create a new one.
360	*/
361	AssertMsgFailed(("rc=%Vrc from RTSemEventWait(%#x).\n", rc, pReq->EventSem));
362	RTSemEventDestroy(pReq->EventSem);
363	rc = RTSemEventCreate(&pReq->EventSem);
364	AssertRC(rc);
365	if (VBOX_FAILURE(rc))
366	return rc;
367	}
368	pReq->fEventSemClear = true;
369	}
370	else
371	Assert(RTSemEventWait(pReq->EventSem, 0) == VERR_TIMEOUT);
372
373	/*
374	* Initialize the packet and return it.
375	*/
376	Assert(pReq->enmType == VMREQTYPE_INVALID);
377	Assert(pReq->enmState == VMREQSTATE_FREE);
378	Assert(pReq->pVM == pVM);
379	ASMAtomicXchgSize(&pReq->pNext, NULL);
380	pReq->enmState = VMREQSTATE_ALLOCATED;
381	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
382	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
383	pReq->enmType = enmType;
384
385	*ppReq = pReq;
386	STAM_COUNTER_INC(&pVM->vm.s.StatReqAllocRecycled);
387	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p recycled\n", pReq));
388	return VINF_SUCCESS;
389	}
390	}
391
392	/*
393	* Ok allocate one.
394	*/
395	PVMREQ pReq = (PVMREQ)MMR3HeapAlloc(pVM, MM_TAG_VM_REQ, sizeof(*pReq));
396	if (!pReq)
397	return VERR_NO_MEMORY;
398
399	/*
400	* Create the semaphore.
401	*/
402	int rc = RTSemEventCreate(&pReq->EventSem);
403	AssertRC(rc);
404	if (VBOX_FAILURE(rc))
405	{
406	MMR3HeapFree(pReq);
407	return rc;
408	}
409
410	/*
411	* Initialize the packet and return it.
412	*/
413	pReq->pNext = NULL;
414	pReq->pVM = pVM;
415	pReq->enmState = VMREQSTATE_ALLOCATED;
416	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
417	pReq->fEventSemClear = true;
418	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
419	pReq->enmType = enmType;
420
421	*ppReq = pReq;
422	STAM_COUNTER_INC(&pVM->vm.s.StatReqAllocNew);
423	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p new\n", pReq));
424	return VINF_SUCCESS;
425	}
426
427
428	/**
429	* Free a request packet.
430	*
431	* @returns VBox status code.
432	*
433	* @param pReq Package to free.
434	* @remark The request packet must be in allocated or completed state!
435	*/
436	VMR3DECL(int) VMR3ReqFree(PVMREQ pReq)
437	{
438	/*
439	* Ignore NULL (all free functions should do this imho).
440	*/
441	if (!pReq)
442	return VINF_SUCCESS;
443
444	STAM_COUNTER_INC(&pReq->pVM->vm.s.StatReqFree);
445
446	/*
447	* Check packet state.
448	*/
449	switch (pReq->enmState)
450	{
451	case VMREQSTATE_ALLOCATED:
452	case VMREQSTATE_COMPLETED:
453	break;
454	default:
455	AssertMsgFailed(("Invalid state %d!\n", pReq->enmState));
456	return VERR_VM_REQUEST_STATE;
457	}
458
459	/*
460	* Make it a free packet and put it into one of the free packet lists.
461	*/
462	pReq->enmState = VMREQSTATE_FREE;
463	pReq->iStatus = VERR_VM_REQUEST_STATUS_FREED;
464	pReq->enmType = VMREQTYPE_INVALID;
465
466	PVM pVM = pReq->pVM;
467	if (pVM->vm.s.cReqFree < 128)
468	{
469	ASMAtomicIncU32(&pVM->vm.s.cReqFree);
470	PVMREQ volatile *ppHead = &pVM->vm.s.apReqFree[ASMAtomicIncU32(&pVM->vm.s.iReqFree) % ELEMENTS(pVM->vm.s.apReqFree)];
471	PVMREQ pNext;
472	do
473	{
474	pNext = *ppHead;
475	ASMAtomicXchgPtr((void * volatile *)&pReq->pNext, pNext);
476	} while (!ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pReq, (void *)pNext));
477	}
478	else
479	{
480	STAM_COUNTER_INC(&pReq->pVM->vm.s.StatReqFreeOverflow);
481	RTSemEventDestroy(pReq->EventSem);
482	MMR3HeapFree(pReq);
483	}
484	return VINF_SUCCESS;
485	}
486
487
488	/**
489	* Queue a request.
490	*
491	* The quest must be allocated using VMR3ReqAlloc() and contain
492	* all the required data.
493	* If it's desired to poll on the completion of the request set cMillies
494	* to 0 and use VMR3ReqWait() to check for completation. In the other case
495	* use RT_INDEFINITE_WAIT.
496	*
497	* @returns VBox status code.
498	* Will not return VERR_INTERRUPTED.
499	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
500	*
501	* @param pReq The request to queue.
502	* @param cMillies Number of milliseconds to wait for the request to
503	* be completed. Use RT_INDEFINITE_WAIT to only
504	* wait till it's completed.
505	*/
506	VMR3DECL(int) VMR3ReqQueue(PVMREQ pReq, unsigned cMillies)
507	{
508	LogFlow(("VMR3ReqQueue: pReq=%p cMillies=%d\n", pReq, cMillies));
509	/*
510	* Verify the supplied package.
511	*/
512	if (pReq->enmState != VMREQSTATE_ALLOCATED)
513	{
514	AssertMsgFailed(("Invalid state %d\n", pReq->enmState));
515	return VERR_VM_REQUEST_STATE;
516	}
517	if ( !pReq->pVM
518	\|\| pReq->pNext
519	\|\| !pReq->EventSem)
520	{
521	AssertMsgFailed(("Invalid request package! Anyone cooking their own packages???\n"));
522	return VERR_VM_REQUEST_INVALID_PACKAGE;
523	}
524	if ( pReq->enmType < VMREQTYPE_INVALID
525	\|\| pReq->enmType > VMREQTYPE_MAX)
526	{
527	AssertMsgFailed(("Invalid package type %d valid range %d-%d inclusivly. This was verified on alloc too...\n",
528	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1));
529	return VERR_VM_REQUEST_INVALID_TYPE;
530	}
531
532	int rc = VINF_SUCCESS;
533	if (pReq->pVM->NativeThreadEMT != RTThreadNativeSelf())
534	{
535	/*
536	* Insert it.
537	*/
538	pReq->enmState = VMREQSTATE_QUEUED;
539	PVMREQ pNext;
540	do
541	{
542	pNext = pReq->pVM->vm.s.pReqs;
543	pReq->pNext = pNext;
544	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pReq->pVM->vm.s.pReqs, (void )pReq, (void *)pNext));
545
546	/*
547	* Notify EMT.
548	*/
549	VM_FF_SET(pReq->pVM, VM_FF_REQUEST);
550	VMR3NotifyFF(pReq->pVM, false);
551
552	/*
553	* Wait and return.
554	*/
555	if (!(pReq->fFlags & VMREQFLAGS_NO_WAIT))
556	rc = VMR3ReqWait(pReq, cMillies);
557	LogFlow(("VMR3ReqQueue: returns %Vrc\n", rc));
558	}
559	else
560	{
561	/*
562	* The requester was EMT, just execute it.
563	*/
564	pReq->enmState = VMREQSTATE_QUEUED;
565	rc = vmR3ReqProcessOne(pReq->pVM, pReq);
566	LogFlow(("VMR3ReqQueue: returns %Vrc (processed)\n", rc));
567	}
568	return rc;
569	}
570
571
572	/**
573	* Wait for a request to be completed.
574	*
575	* @returns VBox status code.
576	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
577	*
578	* @param pReq The request to wait for.
579	* @param cMillies Number of milliseconds to wait.
580	* Use RT_INDEFINITE_WAIT to only wait till it's completed.
581	*/
582	VMR3DECL(int) VMR3ReqWait(PVMREQ pReq, unsigned cMillies)
583	{
584	LogFlow(("VMR3ReqWait: pReq=%p cMillies=%d\n", pReq, cMillies));
585
586	/*
587	* Verify the supplied package.
588	*/
589	if ( pReq->enmState != VMREQSTATE_QUEUED
590	&& pReq->enmState != VMREQSTATE_PROCESSING
591	&& pReq->enmState != VMREQSTATE_COMPLETED)
592	{
593	AssertMsgFailed(("Invalid state %d\n", pReq->enmState));
594	return VERR_VM_REQUEST_STATE;
595	}
596	if ( !pReq->pVM
597	\|\| !pReq->EventSem)
598	{
599	AssertMsgFailed(("Invalid request package! Anyone cooking their own packages???\n"));
600	return VERR_VM_REQUEST_INVALID_PACKAGE;
601	}
602	if ( pReq->enmType < VMREQTYPE_INVALID
603	\|\| pReq->enmType > VMREQTYPE_MAX)
604	{
605	AssertMsgFailed(("Invalid package type %d valid range %d-%d inclusivly. This was verified on alloc and queue too...\n",
606	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1));
607	return VERR_VM_REQUEST_INVALID_TYPE;
608	}
609
610	/*
611	* Check for deadlock condition
612	*/
613	AssertMsg(!VMMR3LockIsOwner(pReq->pVM), ("Waiting for EMT to process a request, but we own the global VM lock!?!?!?!\n"));
614
615	/*
616	* Wait on the package.
617	*/
618	int rc;
619	if (cMillies != RT_INDEFINITE_WAIT)
620	rc = RTSemEventWait(pReq->EventSem, cMillies);
621	else
622	{
623	do
624	{
625	rc = RTSemEventWait(pReq->EventSem, RT_INDEFINITE_WAIT);
626	Assert(rc != VERR_TIMEOUT);
627	} while (pReq->enmState != VMREQSTATE_COMPLETED);
628	}
629	if (VBOX_SUCCESS(rc))
630	ASMAtomicXchgSize(&pReq->fEventSemClear, true);
631	if (pReq->enmState == VMREQSTATE_COMPLETED)
632	rc = VINF_SUCCESS;
633	LogFlow(("VMR3ReqWait: returns %Vrc\n", rc));
634	Assert(rc != VERR_INTERRUPTED);
635	return rc;
636	}
637
638
639	/**
640	* Process pending request(s).
641	*
642	* This function is called from a forced action handler in
643	* the EMT.
644	*
645	* @returns VBox status code.
646	*
647	* @param pVM VM handle.
648	*/
649	VMR3DECL(int) VMR3ReqProcess(PVM pVM)
650	{
651	LogFlow(("VMR3ReqProcess: (enmVMState=%d)\n", pVM->enmVMState));
652
653	/*
654	* Process loop.
655	*
656	* We do not repeat the outer loop if we've got an informationtional status code
657	* since that code needs processing by our caller.
658	*/
659	int rc = VINF_SUCCESS;
660	while (rc <= VINF_SUCCESS)
661	{
662	/*
663	* Get pending requests.
664	*/
665	VM_FF_CLEAR(pVM, VM_FF_REQUEST);
666	PVMREQ pReqs = (PVMREQ)ASMAtomicXchgPtr((void * volatile *)&pVM->vm.s.pReqs, NULL);
667	if (!pReqs)
668	break;
669
670	/*
671	* Reverse the list to process it in FIFO order.
672	*/
673	PVMREQ pReq = pReqs;
674	if (pReq->pNext)
675	Log2(("VMR3ReqProcess: 2+ requests: %p %p %p\n", pReq, pReq->pNext, pReq->pNext->pNext));
676	pReqs = NULL;
677	while (pReq)
678	{
679	Assert(pReq->enmState == VMREQSTATE_QUEUED);
680	Assert(pReq->pVM == pVM);
681	PVMREQ pCur = pReq;
682	pReq = pReq->pNext;
683	pCur->pNext = pReqs;
684	pReqs = pCur;
685	}
686
687
688	/*
689	* Process the requests.
690	*
691	* Since this is a FF worker certain rules applies to the
692	* status codes. See the EM section in VBox/err.h and EM.cpp for details.
693	*/
694	while (pReqs)
695	{
696	/* Unchain the first request and advance the list. */
697	pReq = pReqs;
698	pReqs = pReqs->pNext;
699	pReq->pNext = NULL;
700
701	/* Process the request */
702	int rc2 = vmR3ReqProcessOne(pVM, pReq);
703
704	/*
705	* The status code handling extremely important yet very fragile. Should probably
706	* look for a better way of communicating status changes to EM...
707	*/
708	if ( rc2 >= VINF_EM_FIRST
709	&& rc2 <= VINF_EM_LAST
710	&& ( rc == VINF_SUCCESS
711	\|\| rc2 < rc) )
712	rc = rc2;
713	}
714	}
715
716	LogFlow(("VMR3ReqProcess: returns %Vrc (enmVMState=%d)\n", rc, pVM->enmVMState));
717	return rc;
718	}
719
720
721	/**
722	* Process one request.
723	*
724	* @returns VBox status code.
725	*
726	* @param pVM VM handle.
727	* @param pReq Request packet to process.
728	*/
729	static int vmR3ReqProcessOne(PVM pVM, PVMREQ pReq)
730	{
731	LogFlow(("vmR3ReqProcessOne: pReq=%p type=%d fFlags=%#x\n", pReq, pReq->enmType, pReq->fFlags));
732
733	/*
734	* Process the request.
735	*/
736	Assert(pReq->enmState == VMREQSTATE_QUEUED);
737	pReq->enmState = VMREQSTATE_PROCESSING;
738	int rcRet = VINF_SUCCESS; /* the return code of this function. */
739	int rcReq = VERR_NOT_IMPLEMENTED; /* the request status. */
740	switch (pReq->enmType)
741	{
742	/*
743	* A packed down call frame.
744	*/
745	case VMREQTYPE_INTERNAL:
746	{
747	uintptr_t *pauArgs = &pReq->u.Internal.aArgs[0];
748	union
749	{
750	PFNRT pfn;
751	DECLCALLBACKMEMBER(int, pfn00)(void);
752	DECLCALLBACKMEMBER(int, pfn01)(uintptr_t);
753	DECLCALLBACKMEMBER(int, pfn02)(uintptr_t, uintptr_t);
754	DECLCALLBACKMEMBER(int, pfn03)(uintptr_t, uintptr_t, uintptr_t);
755	DECLCALLBACKMEMBER(int, pfn04)(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
756	DECLCALLBACKMEMBER(int, pfn05)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
757	DECLCALLBACKMEMBER(int, pfn06)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
758	DECLCALLBACKMEMBER(int, pfn07)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
759	DECLCALLBACKMEMBER(int, pfn08)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
760	DECLCALLBACKMEMBER(int, pfn09)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
761	DECLCALLBACKMEMBER(int, pfn10)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
762	DECLCALLBACKMEMBER(int, pfn11)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
763	DECLCALLBACKMEMBER(int, pfn12)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
764	} u;
765	u.pfn = pReq->u.Internal.pfn;
766	#ifdef __AMD64__
767	switch (pReq->u.Internal.cArgs)
768	{
769	case 0: rcRet = u.pfn00(); break;
770	case 1: rcRet = u.pfn01(pauArgs[0]); break;
771	case 2: rcRet = u.pfn02(pauArgs[0], pauArgs[1]); break;
772	case 3: rcRet = u.pfn03(pauArgs[0], pauArgs[1], pauArgs[2]); break;
773	case 4: rcRet = u.pfn04(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3]); break;
774	case 5: rcRet = u.pfn05(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4]); break;
775	case 6: rcRet = u.pfn06(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5]); break;
776	case 7: rcRet = u.pfn07(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6]); break;
777	case 8: rcRet = u.pfn08(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7]); break;
778	case 9: rcRet = u.pfn09(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8]); break;
779	case 10: rcRet = u.pfn10(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9]); break;
780	case 11: rcRet = u.pfn11(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10]); break;
781	case 12: rcRet = u.pfn12(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11]); break;
782	default:
783	AssertReleaseMsgFailed(("cArgs=%d\n", pReq->u.Internal.cArgs));
784	rcRet = rcReq = VERR_INTERNAL_ERROR;
785	break;
786	}
787	#else /* x86: */
788	size_t cbArgs = pReq->u.Internal.cArgs * sizeof(uintptr_t);
789	# ifdef __GNUC__
790	__asm__ __volatile__("movl %%esp, %%edx\n\t"
791	"subl %2, %%esp\n\t"
792	"andl $0xfffffff0, %%esp\n\t"
793	"shrl $2, %2\n\t"
794	"movl %%esp, %%edi\n\t"
795	"rep movsl\n\t"
796	"movl %%edx, %%edi\n\t"
797	"call *%%eax\n\t"
798	"mov %%edi, %%esp\n\t"
799	: "=a" (rcRet),
800	"=S" (pauArgs),
801	"=c" (cbArgs)
802	: "0" (u.pfn),
803	"1" (pauArgs),
804	"2" (cbArgs)
805	: "edi", "edx");
806	# else
807	__asm
808	{
809	xor edx, edx /* just mess it up. */
810	mov eax, u.pfn
811	mov ecx, cbArgs
812	shr ecx, 2
813	mov esi, pauArgs
814	mov ebx, esp
815	sub esp, cbArgs
816	and esp, 0xfffffff0
817	mov edi, esp
818	rep movsd
819	call eax
820	mov esp, ebx
821	mov rcRet, eax
822	}
823	# endif
824	#endif /* x86 */
825	if ((pReq->fFlags & (VMREQFLAGS_RETURN_MASK)) == VMREQFLAGS_VOID)
826	rcRet = VINF_SUCCESS;
827	rcReq = rcRet;
828	break;
829	}
830
831	default:
832	AssertMsgFailed(("pReq->enmType=%d\n", pReq->enmType));
833	rcReq = VERR_NOT_IMPLEMENTED;
834	break;
835	}
836
837	/*
838	* Complete the request.
839	*/
840	pReq->iStatus = rcReq;
841	pReq->enmState = VMREQSTATE_COMPLETED;
842	if (pReq->fFlags & VMREQFLAGS_NO_WAIT)
843	{
844	/* Free the packet, nobody is waiting. */
845	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Vrc rcRet=%Vrc - freeing it\n",
846	pReq, rcReq, rcRet));
847	VMR3ReqFree(pReq);
848	}
849	else
850	{
851	/* Notify the waiter and him free up the packet. */
852	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Vrc rcRet=%Vrc - notifying waiting thread\n",
853	pReq, rcReq, rcRet));
854	ASMAtomicXchgSize(&pReq->fEventSemClear, false);
855	int rc2 = RTSemEventSignal(pReq->EventSem);
856	if (VBOX_FAILURE(rc2))
857	{
858	AssertRC(rc2);
859	rcRet = rc2;
860	}
861	}
862	return rcRet;
863	}
864
865
866
867

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source: vbox/trunk/src/VBox/VMM/VMReq.cpp@ 2776

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