VMReq.cpp@ 13824

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1	/* $Id: VMReq.cpp 13818 2008-11-04 22:59:47Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
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	#include <VBox/uvm.h>
32
33	#include <VBox/err.h>
34	#include <VBox/param.h>
35	#include <VBox/log.h>
36	#include <iprt/assert.h>
37	#include <iprt/asm.h>
38	#include <iprt/string.h>
39	#include <iprt/time.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/thread.h>
42
43
44	/*******************************************************************************
45	* Internal Functions *
46	*******************************************************************************/
47	static int vmR3ReqProcessOneU(PUVM pUVM, PVMREQ pReq);
48
49
50	/**
51	* Allocate and queue a call request.
52	*
53	* If it's desired to poll on the completion of the request set cMillies
54	* to 0 and use VMR3ReqWait() to check for completation. In the other case
55	* use RT_INDEFINITE_WAIT.
56	* The returned request packet must be freed using VMR3ReqFree().
57	*
58	* @returns VBox status code.
59	* Will not return VERR_INTERRUPTED.
60	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
61	*
62	* @param pVM The VM handle.
63	* @param enmDest Destination of the request packet (global or per VCPU).
64	* @param ppReq Where to store the pointer to the request.
65	* This will be NULL or a valid request pointer not matter what happends.
66	* @param cMillies Number of milliseconds to wait for the request to
67	* be completed. Use RT_INDEFINITE_WAIT to only
68	* wait till it's completed.
69	* @param pfnFunction Pointer to the function to call.
70	* @param cArgs Number of arguments following in the ellipsis.
71	* Not possible to pass 64-bit arguments!
72	* @param ... Function arguments.
73	*/
74	VMMR3DECL(int) VMR3ReqCall(PVM pVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, PFNRT pfnFunction, unsigned cArgs, ...)
75	{
76	va_list va;
77	va_start(va, cArgs);
78	int rc = VMR3ReqCallVU(pVM->pUVM, enmDest, ppReq, cMillies, VMREQFLAGS_VBOX_STATUS, pfnFunction, cArgs, va);
79	va_end(va);
80	return rc;
81	}
82
83
84	/**
85	* Allocate and queue a call request to a void function.
86	*
87	* If it's desired to poll on the completion of the request set cMillies
88	* to 0 and use VMR3ReqWait() to check for completation. In the other case
89	* use RT_INDEFINITE_WAIT.
90	* The returned request packet must be freed using VMR3ReqFree().
91	*
92	* @returns VBox status code.
93	* Will not return VERR_INTERRUPTED.
94	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
95	*
96	* @param pUVM Pointer to the user mode VM structure.
97	* @param enmDest Destination of the request packet (global or per VCPU).
98	* @param ppReq Where to store the pointer to the request.
99	* This will be NULL or a valid request pointer not matter what happends.
100	* @param cMillies Number of milliseconds to wait for the request to
101	* be completed. Use RT_INDEFINITE_WAIT to only
102	* wait till it's completed.
103	* @param pfnFunction Pointer to the function to call.
104	* @param cArgs Number of arguments following in the ellipsis.
105	* Not possible to pass 64-bit arguments!
106	* @param ... Function arguments.
107	*/
108	VMMR3DECL(int) VMR3ReqCallVoidU(PUVM pUVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, PFNRT pfnFunction, unsigned cArgs, ...)
109	{
110	va_list va;
111	va_start(va, cArgs);
112	int rc = VMR3ReqCallVU(pUVM, enmDest, ppReq, cMillies, VMREQFLAGS_VOID, pfnFunction, cArgs, va);
113	va_end(va);
114	return rc;
115	}
116
117
118	/**
119	* Allocate and queue a call request to a void function.
120	*
121	* If it's desired to poll on the completion of the request set cMillies
122	* to 0 and use VMR3ReqWait() to check for completation. In the other case
123	* use RT_INDEFINITE_WAIT.
124	* The returned request packet must be freed using VMR3ReqFree().
125	*
126	* @returns VBox status code.
127	* Will not return VERR_INTERRUPTED.
128	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
129	*
130	* @param pVM The VM handle.
131	* @param enmDest Destination of the request packet (global or per VCPU).
132	* @param ppReq Where to store the pointer to the request.
133	* This will be NULL or a valid request pointer not matter what happends.
134	* @param cMillies Number of milliseconds to wait for the request to
135	* be completed. Use RT_INDEFINITE_WAIT to only
136	* wait till it's completed.
137	* @param pfnFunction Pointer to the function to call.
138	* @param cArgs Number of arguments following in the ellipsis.
139	* Not possible to pass 64-bit arguments!
140	* @param ... Function arguments.
141	*/
142	VMMR3DECL(int) VMR3ReqCallVoid(PVM pVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, PFNRT pfnFunction, unsigned cArgs, ...)
143	{
144	va_list va;
145	va_start(va, cArgs);
146	int rc = VMR3ReqCallVU(pVM->pUVM, enmDest, ppReq, cMillies, VMREQFLAGS_VOID, pfnFunction, cArgs, va);
147	va_end(va);
148	return rc;
149	}
150
151
152	/**
153	* Allocate and queue a call request to a void function.
154	*
155	* If it's desired to poll on the completion of the request set cMillies
156	* to 0 and use VMR3ReqWait() to check for completation. In the other case
157	* use RT_INDEFINITE_WAIT.
158	* The returned request packet must be freed using VMR3ReqFree().
159	*
160	* @returns VBox status code.
161	* Will not return VERR_INTERRUPTED.
162	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
163	*
164	* @param pVM The VM handle.
165	* @param enmDest Destination of the request packet (global or per VCPU).
166	* @param ppReq Where to store the pointer to the request.
167	* This will be NULL or a valid request pointer not matter what happends, unless fFlags
168	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
169	* @param cMillies Number of milliseconds to wait for the request to
170	* be completed. Use RT_INDEFINITE_WAIT to only
171	* wait till it's completed.
172	* @param fFlags A combination of the VMREQFLAGS values.
173	* @param pfnFunction Pointer to the function to call.
174	* @param cArgs Number of arguments following in the ellipsis.
175	* Not possible to pass 64-bit arguments!
176	* @param ... Function arguments.
177	*/
178	VMMR3DECL(int) VMR3ReqCallEx(PVM pVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
179	{
180	va_list va;
181	va_start(va, cArgs);
182	int rc = VMR3ReqCallVU(pVM->pUVM, enmDest, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
183	va_end(va);
184	return rc;
185	}
186
187
188	/**
189	* Allocate and queue a call request to a void function.
190	*
191	* If it's desired to poll on the completion of the request set cMillies
192	* to 0 and use VMR3ReqWait() to check for completation. In the other case
193	* use RT_INDEFINITE_WAIT.
194	* The returned request packet must be freed using VMR3ReqFree().
195	*
196	* @returns VBox status code.
197	* Will not return VERR_INTERRUPTED.
198	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
199	*
200	* @param pUVM Pointer to the user mode VM structure.
201	* @param enmDest Destination of the request packet (global or per VCPU).
202	* @param ppReq Where to store the pointer to the request.
203	* This will be NULL or a valid request pointer not matter what happends, unless fFlags
204	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
205	* @param cMillies Number of milliseconds to wait for the request to
206	* be completed. Use RT_INDEFINITE_WAIT to only
207	* wait till it's completed.
208	* @param fFlags A combination of the VMREQFLAGS values.
209	* @param pfnFunction Pointer to the function to call.
210	* @param cArgs Number of arguments following in the ellipsis.
211	* Not possible to pass 64-bit arguments!
212	* @param ... Function arguments.
213	*/
214	VMMR3DECL(int) VMR3ReqCallU(PUVM pUVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, ...)
215	{
216	va_list va;
217	va_start(va, cArgs);
218	int rc = VMR3ReqCallVU(pUVM, enmDest, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
219	va_end(va);
220	return rc;
221	}
222
223
224	/**
225	* Allocate and queue a call request.
226	*
227	* If it's desired to poll on the completion of the request set cMillies
228	* to 0 and use VMR3ReqWait() to check for completation. In the other case
229	* use RT_INDEFINITE_WAIT.
230	* The returned request packet must be freed using VMR3ReqFree().
231	*
232	* @returns VBox status code.
233	* Will not return VERR_INTERRUPTED.
234	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
235	*
236	* @param pUVM Pointer to the user mode VM structure.
237	* @param enmDest Destination of the request packet (global or per VCPU).
238	* @param ppReq Where to store the pointer to the request.
239	* This will be NULL or a valid request pointer not matter what happends, unless fFlags
240	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
241	* @param cMillies Number of milliseconds to wait for the request to
242	* be completed. Use RT_INDEFINITE_WAIT to only
243	* wait till it's completed.
244	* @param pfnFunction Pointer to the function to call.
245	* @param fFlags A combination of the VMREQFLAGS values.
246	* @param cArgs Number of arguments following in the ellipsis.
247	* Stuff which differs in size from uintptr_t is gonna make trouble, so don't try!
248	* @param Args Argument vector.
249	*/
250	VMMR3DECL(int) VMR3ReqCallVU(PUVM pUVM, VMREQDEST enmDest, PVMREQ *ppReq, unsigned cMillies, unsigned fFlags, PFNRT pfnFunction, unsigned cArgs, va_list Args)
251	{
252	LogFlow(("VMR3ReqCallV: cMillies=%d fFlags=%#x pfnFunction=%p cArgs=%d\n", cMillies, fFlags, pfnFunction, cArgs));
253
254	/*
255	* Validate input.
256	*/
257	AssertPtrReturn(pfnFunction, VERR_INVALID_POINTER);
258	AssertPtrReturn(pUVM, VERR_INVALID_POINTER);
259	AssertReturn(!(fFlags & ~(VMREQFLAGS_RETURN_MASK \| VMREQFLAGS_NO_WAIT)), VERR_INVALID_PARAMETER);
260	if (!(fFlags & VMREQFLAGS_NO_WAIT) \|\| ppReq)
261	{
262	AssertPtrReturn(ppReq, VERR_INVALID_POINTER);
263	*ppReq = NULL;
264	}
265	PVMREQ pReq = NULL;
266	AssertMsgReturn(cArgs * sizeof(uintptr_t) <= sizeof(pReq->u.Internal.aArgs),
267	("cArg=%d\n", cArgs),
268	VERR_TOO_MUCH_DATA);
269
270	/*
271	* Allocate request
272	*/
273	int rc = VMR3ReqAllocU(pUVM, &pReq, VMREQTYPE_INTERNAL, enmDest);
274	if (RT_FAILURE(rc))
275	return rc;
276
277	/*
278	* Initialize the request data.
279	*/
280	pReq->fFlags = fFlags;
281	pReq->u.Internal.pfn = pfnFunction;
282	pReq->u.Internal.cArgs = cArgs;
283	for (unsigned iArg = 0; iArg < cArgs; iArg++)
284	pReq->u.Internal.aArgs[iArg] = va_arg(Args, uintptr_t);
285
286	/*
287	* Queue the request and return.
288	*/
289	rc = VMR3ReqQueue(pReq, cMillies);
290	if ( RT_FAILURE(rc)
291	&& rc != VERR_TIMEOUT)
292	{
293	VMR3ReqFree(pReq);
294	pReq = NULL;
295	}
296	if (!(fFlags & VMREQFLAGS_NO_WAIT))
297	{
298	*ppReq = pReq;
299	LogFlow(("VMR3ReqCallV: returns %Rrc *ppReq=%p\n", rc, pReq));
300	}
301	else
302	LogFlow(("VMR3ReqCallV: returns %Rrc\n", rc));
303	Assert(rc != VERR_INTERRUPTED);
304	return rc;
305	}
306
307
308	/**
309	* Joins the list pList with whatever is linked up at *pHead.
310	*/
311	static void vmr3ReqJoinFreeSub(volatile PVMREQ *ppHead, PVMREQ pList)
312	{
313	for (unsigned cIterations = 0;; cIterations++)
314	{
315	PVMREQ pHead = (PVMREQ)ASMAtomicXchgPtr((void * volatile *)ppHead, pList);
316	if (!pHead)
317	return;
318	PVMREQ pTail = pHead;
319	while (pTail->pNext)
320	pTail = pTail->pNext;
321	pTail->pNext = pList;
322	if (ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pHead, pList))
323	return;
324	pTail->pNext = NULL;
325	if (ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pHead, NULL))
326	return;
327	pList = pHead;
328	Assert(cIterations != 32);
329	Assert(cIterations != 64);
330	}
331	}
332
333
334	/**
335	* Joins the list pList with whatever is linked up at *pHead.
336	*/
337	static void vmr3ReqJoinFree(PVMINTUSERPERVM pVMInt, PVMREQ pList)
338	{
339	/*
340	* Split the list if it's too long.
341	*/
342	unsigned cReqs = 1;
343	PVMREQ pTail = pList;
344	while (pTail->pNext)
345	{
346	if (cReqs++ > 25)
347	{
348	const uint32_t i = pVMInt->iReqFree;
349	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2) % RT_ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
350
351	pTail->pNext = NULL;
352	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2 + (i == pVMInt->iReqFree)) % RT_ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
353	return;
354	}
355	pTail = pTail->pNext;
356	}
357	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(pVMInt->iReqFree + 2) % RT_ELEMENTS(pVMInt->apReqFree)], pList);
358	}
359
360
361	/**
362	* Allocates a request packet.
363	*
364	* The caller allocates a request packet, fills in the request data
365	* union and queues the request.
366	*
367	* @returns VBox status code.
368	*
369	* @param pVM VM handle.
370	* @param ppReq Where to store the pointer to the allocated packet.
371	* @param enmType Package type.
372	* @param enmDest Destination of the request packet (global or per VCPU).
373	*/
374	VMMR3DECL(int) VMR3ReqAlloc(PVM pVM, PVMREQ *ppReq, VMREQTYPE enmType, VMREQDEST enmDest)
375	{
376	return VMR3ReqAllocU(pVM->pUVM, ppReq, enmType, enmDest);
377	}
378
379
380	/**
381	* Allocates a request packet.
382	*
383	* The caller allocates a request packet, fills in the request data
384	* union and queues the request.
385	*
386	* @returns VBox status code.
387	*
388	* @param pUVM Pointer to the user mode VM structure.
389	* @param ppReq Where to store the pointer to the allocated packet.
390	* @param enmType Package type.
391	* @param enmDest Destination of the request packet (global or per VCPU).
392	*/
393	VMMR3DECL(int) VMR3ReqAllocU(PUVM pUVM, PVMREQ *ppReq, VMREQTYPE enmType, VMREQDEST enmDest)
394	{
395	/*
396	* Validate input.
397	*/
398	AssertMsgReturn(enmType > VMREQTYPE_INVALID && enmType < VMREQTYPE_MAX,
399	("Invalid package type %d valid range %d-%d inclusivly.\n",
400	enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
401	VERR_VM_REQUEST_INVALID_TYPE);
402	AssertPtrReturn(ppReq, VERR_INVALID_POINTER);
403	AssertMsgReturn(enmDest == VMREQDEST_ANY \|\| enmDest == VMREQDEST_BROADCAST \|\| (unsigned)enmDest < pUVM->pVM->cCPUs, ("Invalid destination %d (max=%d)\n", enmDest, pUVM->pVM->cCPUs), VERR_INVALID_PARAMETER);
404
405	/*
406	* Try get a recycled packet.
407	* While this could all be solved with a single list with a lock, it's a sport
408	* of mine to avoid locks.
409	*/
410	int cTries = RT_ELEMENTS(pUVM->vm.s.apReqFree) * 2;
411	while (--cTries >= 0)
412	{
413	PVMREQ volatile *ppHead = &pUVM->vm.s.apReqFree[ASMAtomicIncU32(&pUVM->vm.s.iReqFree) % RT_ELEMENTS(pUVM->vm.s.apReqFree)];
414	#if 0 /* sad, but this won't work safely because the reading of pReq->pNext. */
415	PVMREQ pNext = NULL;
416	PVMREQ pReq = *ppHead;
417	if ( pReq
418	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, (pNext = pReq->pNext), pReq)
419	&& (pReq = *ppHead)
420	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, (pNext = pReq->pNext), pReq))
421	pReq = NULL;
422	if (pReq)
423	{
424	Assert(pReq->pNext == pNext); NOREF(pReq);
425	#else
426	PVMREQ pReq = (PVMREQ)ASMAtomicXchgPtr((void * volatile *)ppHead, NULL);
427	if (pReq)
428	{
429	PVMREQ pNext = pReq->pNext;
430	if ( pNext
431	&& !ASMAtomicCmpXchgPtr((void * volatile *)ppHead, pNext, NULL))
432	{
433	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocRaces);
434	vmr3ReqJoinFree(&pUVM->vm.s, pReq->pNext);
435	}
436	#endif
437	ASMAtomicDecU32(&pUVM->vm.s.cReqFree);
438
439	/*
440	* Make sure the event sem is not signaled.
441	*/
442	if (!pReq->fEventSemClear)
443	{
444	int rc = RTSemEventWait(pReq->EventSem, 0);
445	if (rc != VINF_SUCCESS && rc != VERR_TIMEOUT)
446	{
447	/*
448	* This shall not happen, but if it does we'll just destroy
449	* the semaphore and create a new one.
450	*/
451	AssertMsgFailed(("rc=%Rrc from RTSemEventWait(%#x).\n", rc, pReq->EventSem));
452	RTSemEventDestroy(pReq->EventSem);
453	rc = RTSemEventCreate(&pReq->EventSem);
454	AssertRC(rc);
455	if (RT_FAILURE(rc))
456	return rc;
457	}
458	pReq->fEventSemClear = true;
459	}
460	else
461	Assert(RTSemEventWait(pReq->EventSem, 0) == VERR_TIMEOUT);
462
463	/*
464	* Initialize the packet and return it.
465	*/
466	Assert(pReq->enmType == VMREQTYPE_INVALID);
467	Assert(pReq->enmState == VMREQSTATE_FREE);
468	Assert(pReq->pUVM == pUVM);
469	ASMAtomicXchgSize(&pReq->pNext, NULL);
470	pReq->enmState = VMREQSTATE_ALLOCATED;
471	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
472	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
473	pReq->enmType = enmType;
474	pReq->enmDest = enmDest;
475
476	*ppReq = pReq;
477	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocRecycled);
478	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p recycled\n", pReq));
479	return VINF_SUCCESS;
480	}
481	}
482
483	/*
484	* Ok allocate one.
485	*/
486	PVMREQ pReq = (PVMREQ)MMR3HeapAllocU(pUVM, MM_TAG_VM_REQ, sizeof(*pReq));
487	if (!pReq)
488	return VERR_NO_MEMORY;
489
490	/*
491	* Create the semaphore.
492	*/
493	int rc = RTSemEventCreate(&pReq->EventSem);
494	AssertRC(rc);
495	if (RT_FAILURE(rc))
496	{
497	MMR3HeapFree(pReq);
498	return rc;
499	}
500
501	/*
502	* Initialize the packet and return it.
503	*/
504	pReq->pNext = NULL;
505	pReq->pUVM = pUVM;
506	pReq->enmState = VMREQSTATE_ALLOCATED;
507	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
508	pReq->fEventSemClear = true;
509	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
510	pReq->enmType = enmType;
511	pReq->enmDest = enmDest;
512
513	*ppReq = pReq;
514	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocNew);
515	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p new\n", pReq));
516	return VINF_SUCCESS;
517	}
518
519
520	/**
521	* Free a request packet.
522	*
523	* @returns VBox status code.
524	*
525	* @param pReq Package to free.
526	* @remark The request packet must be in allocated or completed state!
527	*/
528	VMMR3DECL(int) VMR3ReqFree(PVMREQ pReq)
529	{
530	/*
531	* Ignore NULL (all free functions should do this imho).
532	*/
533	if (!pReq)
534	return VINF_SUCCESS;
535
536	/*
537	* Check packet state.
538	*/
539	switch (pReq->enmState)
540	{
541	case VMREQSTATE_ALLOCATED:
542	case VMREQSTATE_COMPLETED:
543	break;
544	default:
545	AssertMsgFailed(("Invalid state %d!\n", pReq->enmState));
546	return VERR_VM_REQUEST_STATE;
547	}
548
549	/*
550	* Make it a free packet and put it into one of the free packet lists.
551	*/
552	pReq->enmState = VMREQSTATE_FREE;
553	pReq->iStatus = VERR_VM_REQUEST_STATUS_FREED;
554	pReq->enmType = VMREQTYPE_INVALID;
555
556	PUVM pUVM = pReq->pUVM;
557	STAM_COUNTER_INC(&pUVM->vm.s.StatReqFree);
558
559	if (pUVM->vm.s.cReqFree < 128)
560	{
561	ASMAtomicIncU32(&pUVM->vm.s.cReqFree);
562	PVMREQ volatile *ppHead = &pUVM->vm.s.apReqFree[ASMAtomicIncU32(&pUVM->vm.s.iReqFree) % RT_ELEMENTS(pUVM->vm.s.apReqFree)];
563	PVMREQ pNext;
564	do
565	{
566	pNext = *ppHead;
567	ASMAtomicXchgPtr((void * volatile *)&pReq->pNext, pNext);
568	} while (!ASMAtomicCmpXchgPtr((void * volatile )ppHead, (void )pReq, (void *)pNext));
569	}
570	else
571	{
572	STAM_COUNTER_INC(&pReq->pUVM->vm.s.StatReqFreeOverflow);
573	RTSemEventDestroy(pReq->EventSem);
574	MMR3HeapFree(pReq);
575	}
576	return VINF_SUCCESS;
577	}
578
579
580	/**
581	* Queue a request.
582	*
583	* The quest must be allocated using VMR3ReqAlloc() and contain
584	* all the required data.
585	* If it's desired to poll on the completion of the request set cMillies
586	* to 0 and use VMR3ReqWait() to check for completation. In the other case
587	* use RT_INDEFINITE_WAIT.
588	*
589	* @returns VBox status code.
590	* Will not return VERR_INTERRUPTED.
591	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
592	*
593	* @param pReq The request to queue.
594	* @param cMillies Number of milliseconds to wait for the request to
595	* be completed. Use RT_INDEFINITE_WAIT to only
596	* wait till it's completed.
597	*/
598	VMMR3DECL(int) VMR3ReqQueue(PVMREQ pReq, unsigned cMillies)
599	{
600	LogFlow(("VMR3ReqQueue: pReq=%p cMillies=%d\n", pReq, cMillies));
601	/*
602	* Verify the supplied package.
603	*/
604	AssertMsgReturn(pReq->enmState == VMREQSTATE_ALLOCATED, ("%d\n", pReq->enmState), VERR_VM_REQUEST_STATE);
605	AssertMsgReturn( VALID_PTR(pReq->pUVM)
606	&& !pReq->pNext
607	&& pReq->EventSem != NIL_RTSEMEVENT,
608	("Invalid request package! Anyone cooking their own packages???\n"),
609	VERR_VM_REQUEST_INVALID_PACKAGE);
610	AssertMsgReturn( pReq->enmType > VMREQTYPE_INVALID
611	&& pReq->enmType < VMREQTYPE_MAX,
612	("Invalid package type %d valid range %d-%d inclusivly. This was verified on alloc too...\n",
613	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
614	VERR_VM_REQUEST_INVALID_TYPE);
615
616	/*
617	* Are we the EMT or not?
618	* Also, store pVM (and fFlags) locally since pReq may be invalid after queuing it.
619	*/
620	int rc = VINF_SUCCESS;
621	PUVM pUVM = ((VMREQ volatile )pReq)->pUVM; / volatile paranoia */
622	PUVMCPU pUVMCPU = (PUVMCPU)RTTlsGet(pUVM->vm.s.idxTLS);
623
624	if (pReq->enmDest == VMREQDEST_BROADCAST)
625	{
626	unsigned fFlags = ((VMREQ volatile )pReq)->fFlags; / volatile paranoia */
627
628	for (unsigned i=0;i<pUVM->pVM->cCPUs;i++)
629	{
630	if ( !pUVMCPU
631	\|\| pUVMCPU->idCPU != i)
632	{
633	/*
634	* Insert it.
635	*/
636	pReq->enmState = VMREQSTATE_QUEUED;
637	PVMREQ pNext;
638	do
639	{
640	pNext = pUVM->aCpus[i].vm.s.pReqs;
641	pReq->pNext = pNext;
642	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pUVM->aCpus[i].vm.s.pReqs, (void )pReq, (void *)pNext));
643
644	/*
645	* Notify EMT.
646	*/
647	if (pUVM->pVM)
648	VMCPU_FF_SET(pUVM->pVM, VM_FF_REQUEST, i);
649	/* @todo: VMR3NotifyFFU*/
650	AssertFailed();
651	VMR3NotifyFFU(pUVM, false);
652
653	/*
654	* Wait and return.
655	*/
656	if (!(fFlags & VMREQFLAGS_NO_WAIT))
657	rc = VMR3ReqWait(pReq, cMillies);
658	LogFlow(("VMR3ReqQueue: returns %Rrc\n", rc));
659	}
660	else
661	{
662	/*
663	* The requester was EMT, just execute it.
664	*/
665	pReq->enmState = VMREQSTATE_QUEUED;
666	rc = vmR3ReqProcessOneU(pUVM, pReq);
667	LogFlow(("VMR3ReqQueue: returns %Rrc (processed)\n", rc));
668	}
669	} /* for each VMCPU */
670	}
671	else
672	if ( pReq->enmDest != VMREQDEST_ANY /* for a specific VMCPU? */
673	&& pUVMCPU->idCPU != (unsigned)pReq->enmDest)
674	{
675	RTCPUID idTarget = (RTCPUID)pReq->enmDest;
676	unsigned fFlags = ((VMREQ volatile )pReq)->fFlags; / volatile paranoia */
677
678	/*
679	* Insert it.
680	*/
681	pReq->enmState = VMREQSTATE_QUEUED;
682	PVMREQ pNext;
683	do
684	{
685	pNext = pUVM->aCpus[idTarget].vm.s.pReqs;
686	pReq->pNext = pNext;
687	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pUVM->aCpus[idTarget].vm.s.pReqs, (void )pReq, (void *)pNext));
688
689	/*
690	* Notify EMT.
691	*/
692	if (pUVM->pVM)
693	VMCPU_FF_SET(pUVM->pVM, VM_FF_REQUEST, idTarget);
694	/* @todo: VMR3NotifyFFU*/
695	AssertFailed();
696	VMR3NotifyFFU(pUVM, false);
697
698	/*
699	* Wait and return.
700	*/
701	if (!(fFlags & VMREQFLAGS_NO_WAIT))
702	rc = VMR3ReqWait(pReq, cMillies);
703	LogFlow(("VMR3ReqQueue: returns %Rrc\n", rc));
704	}
705	else if ( pReq->enmDest == VMREQDEST_ANY
706	&& !pUVMCPU /* only EMT threads have a valid pointer stored in the TLS slot. */)
707	{
708	unsigned fFlags = ((VMREQ volatile )pReq)->fFlags; / volatile paranoia */
709
710	/*
711	* Insert it.
712	*/
713	pReq->enmState = VMREQSTATE_QUEUED;
714	PVMREQ pNext;
715	do
716	{
717	pNext = pUVM->vm.s.pReqs;
718	pReq->pNext = pNext;
719	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pUVM->vm.s.pReqs, (void )pReq, (void *)pNext));
720
721	/*
722	* Notify EMT.
723	*/
724	if (pUVM->pVM)
725	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST);
726	VMR3NotifyFFU(pUVM, false);
727
728	/*
729	* Wait and return.
730	*/
731	if (!(fFlags & VMREQFLAGS_NO_WAIT))
732	rc = VMR3ReqWait(pReq, cMillies);
733	LogFlow(("VMR3ReqQueue: returns %Rrc\n", rc));
734	}
735	else
736	{
737	Assert(pUVMCPU);
738
739	/*
740	* The requester was EMT, just execute it.
741	*/
742	pReq->enmState = VMREQSTATE_QUEUED;
743	rc = vmR3ReqProcessOneU(pUVM, pReq);
744	LogFlow(("VMR3ReqQueue: returns %Rrc (processed)\n", rc));
745	}
746	return rc;
747	}
748
749
750	/**
751	* Wait for a request to be completed.
752	*
753	* @returns VBox status code.
754	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
755	*
756	* @param pReq The request to wait for.
757	* @param cMillies Number of milliseconds to wait.
758	* Use RT_INDEFINITE_WAIT to only wait till it's completed.
759	*/
760	VMMR3DECL(int) VMR3ReqWait(PVMREQ pReq, unsigned cMillies)
761	{
762	LogFlow(("VMR3ReqWait: pReq=%p cMillies=%d\n", pReq, cMillies));
763
764	/*
765	* Verify the supplied package.
766	*/
767	AssertMsgReturn( pReq->enmState == VMREQSTATE_QUEUED
768	\|\| pReq->enmState == VMREQSTATE_PROCESSING
769	\|\| pReq->enmState == VMREQSTATE_COMPLETED,
770	("Invalid state %d\n", pReq->enmState),
771	VERR_VM_REQUEST_STATE);
772	AssertMsgReturn( VALID_PTR(pReq->pUVM)
773	&& pReq->EventSem != NIL_RTSEMEVENT,
774	("Invalid request package! Anyone cooking their own packages???\n"),
775	VERR_VM_REQUEST_INVALID_PACKAGE);
776	AssertMsgReturn( pReq->enmType > VMREQTYPE_INVALID
777	&& pReq->enmType < VMREQTYPE_MAX,
778	("Invalid package type %d valid range %d-%d inclusivly. This was verified on alloc too...\n",
779	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
780	VERR_VM_REQUEST_INVALID_TYPE);
781
782	/*
783	* Check for deadlock condition
784	*/
785	PUVM pUVM = pReq->pUVM;
786	NOREF(pUVM);
787	AssertMsg(!pUVM->pVM \|\| !VMMR3LockIsOwner(pUVM->pVM),
788	("Waiting for EMT to process a request, but we own the global VM lock!?!?!?!\n"));
789
790	/*
791	* Wait on the package.
792	*/
793	int rc;
794	if (cMillies != RT_INDEFINITE_WAIT)
795	rc = RTSemEventWait(pReq->EventSem, cMillies);
796	else
797	{
798	do
799	{
800	rc = RTSemEventWait(pReq->EventSem, RT_INDEFINITE_WAIT);
801	Assert(rc != VERR_TIMEOUT);
802	} while ( pReq->enmState != VMREQSTATE_COMPLETED
803	&& pReq->enmState != VMREQSTATE_INVALID);
804	}
805	if (RT_SUCCESS(rc))
806	ASMAtomicXchgSize(&pReq->fEventSemClear, true);
807	if (pReq->enmState == VMREQSTATE_COMPLETED)
808	rc = VINF_SUCCESS;
809	LogFlow(("VMR3ReqWait: returns %Rrc\n", rc));
810	Assert(rc != VERR_INTERRUPTED);
811	return rc;
812	}
813
814
815	/**
816	* Process pending request(s).
817	*
818	* This function is called from a forced action handler in the EMT
819	* or from one of the EMT loops.
820	*
821	* @returns VBox status code.
822	*
823	* @param pUVM Pointer to the user mode VM structure.
824	* @param enmDest Destination of the request packet (global or per VCPU).
825	*/
826	VMMR3DECL(int) VMR3ReqProcessU(PUVM pUVM, VMREQDEST enmDest)
827	{
828	LogFlow(("VMR3ReqProcessU: (enmVMState=%d) enmDest=%d\n", pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING, enmDest));
829
830	/*
831	* Process loop.
832	*
833	* We do not repeat the outer loop if we've got an informationtional status code
834	* since that code needs processing by our caller.
835	*/
836	int rc = VINF_SUCCESS;
837	while (rc <= VINF_SUCCESS)
838	{
839	/*
840	* Get pending requests.
841	*/
842	void volatile ppReqs;
843	if (enmDest == VMREQDEST_ANY)
844	{
845	ppReqs = (void * volatile *)&pUVM->vm.s.pReqs;
846	if (RT_LIKELY(pUVM->pVM))
847	VM_FF_CLEAR(pUVM->pVM, VM_FF_REQUEST);
848	}
849	else
850	{
851	ppReqs = (void * volatile *)&pUVM->aCpus[enmDest].vm.s.pReqs;
852	if (RT_LIKELY(pUVM->pVM))
853	VMCPU_FF_CLEAR(pUVM->pVM, enmDest, VM_FF_REQUEST);
854	}
855
856	PVMREQ pReqs = (PVMREQ)ASMAtomicXchgPtr(ppReqs, NULL);
857	if (!pReqs)
858	break;
859
860	/*
861	* Reverse the list to process it in FIFO order.
862	*/
863	PVMREQ pReq = pReqs;
864	if (pReq->pNext)
865	Log2(("VMR3ReqProcess: 2+ requests: %p %p %p\n", pReq, pReq->pNext, pReq->pNext->pNext));
866	pReqs = NULL;
867	while (pReq)
868	{
869	Assert(pReq->enmState == VMREQSTATE_QUEUED);
870	Assert(pReq->pUVM == pUVM);
871	PVMREQ pCur = pReq;
872	pReq = pReq->pNext;
873	pCur->pNext = pReqs;
874	pReqs = pCur;
875	}
876
877
878	/*
879	* Process the requests.
880	*
881	* Since this is a FF worker certain rules applies to the
882	* status codes. See the EM section in VBox/err.h and EM.cpp for details.
883	*/
884	while (pReqs)
885	{
886	/* Unchain the first request and advance the list. */
887	pReq = pReqs;
888	pReqs = pReqs->pNext;
889	pReq->pNext = NULL;
890
891	/* Process the request */
892	int rc2 = vmR3ReqProcessOneU(pUVM, pReq);
893
894	/*
895	* The status code handling extremely important yet very fragile. Should probably
896	* look for a better way of communicating status changes to EM...
897	*/
898	if ( rc2 >= VINF_EM_FIRST
899	&& rc2 <= VINF_EM_LAST
900	&& ( rc == VINF_SUCCESS
901	\|\| rc2 < rc) )
902	rc = rc2;
903	}
904	}
905
906	LogFlow(("VMR3ReqProcess: returns %Rrc (enmVMState=%d)\n", rc, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
907	return rc;
908	}
909
910
911	/**
912	* Process one request.
913	*
914	* @returns VBox status code.
915	*
916	* @param pVM VM handle.
917	* @param pReq Request packet to process.
918	*/
919	static int vmR3ReqProcessOneU(PUVM pUVM, PVMREQ pReq)
920	{
921	LogFlow(("vmR3ReqProcessOne: pReq=%p type=%d fFlags=%#x\n", pReq, pReq->enmType, pReq->fFlags));
922
923	/*
924	* Process the request.
925	*/
926	Assert(pReq->enmState == VMREQSTATE_QUEUED);
927	pReq->enmState = VMREQSTATE_PROCESSING;
928	int rcRet = VINF_SUCCESS; /* the return code of this function. */
929	int rcReq = VERR_NOT_IMPLEMENTED; /* the request status. */
930	switch (pReq->enmType)
931	{
932	/*
933	* A packed down call frame.
934	*/
935	case VMREQTYPE_INTERNAL:
936	{
937	uintptr_t *pauArgs = &pReq->u.Internal.aArgs[0];
938	union
939	{
940	PFNRT pfn;
941	DECLCALLBACKMEMBER(int, pfn00)(void);
942	DECLCALLBACKMEMBER(int, pfn01)(uintptr_t);
943	DECLCALLBACKMEMBER(int, pfn02)(uintptr_t, uintptr_t);
944	DECLCALLBACKMEMBER(int, pfn03)(uintptr_t, uintptr_t, uintptr_t);
945	DECLCALLBACKMEMBER(int, pfn04)(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
946	DECLCALLBACKMEMBER(int, pfn05)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
947	DECLCALLBACKMEMBER(int, pfn06)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
948	DECLCALLBACKMEMBER(int, pfn07)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
949	DECLCALLBACKMEMBER(int, pfn08)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
950	DECLCALLBACKMEMBER(int, pfn09)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
951	DECLCALLBACKMEMBER(int, pfn10)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
952	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);
953	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);
954	} u;
955	u.pfn = pReq->u.Internal.pfn;
956	#ifdef RT_ARCH_AMD64
957	switch (pReq->u.Internal.cArgs)
958	{
959	case 0: rcRet = u.pfn00(); break;
960	case 1: rcRet = u.pfn01(pauArgs[0]); break;
961	case 2: rcRet = u.pfn02(pauArgs[0], pauArgs[1]); break;
962	case 3: rcRet = u.pfn03(pauArgs[0], pauArgs[1], pauArgs[2]); break;
963	case 4: rcRet = u.pfn04(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3]); break;
964	case 5: rcRet = u.pfn05(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4]); break;
965	case 6: rcRet = u.pfn06(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5]); break;
966	case 7: rcRet = u.pfn07(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6]); break;
967	case 8: rcRet = u.pfn08(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7]); break;
968	case 9: rcRet = u.pfn09(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8]); break;
969	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;
970	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;
971	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;
972	default:
973	AssertReleaseMsgFailed(("cArgs=%d\n", pReq->u.Internal.cArgs));
974	rcRet = rcReq = VERR_INTERNAL_ERROR;
975	break;
976	}
977	#else /* x86: */
978	size_t cbArgs = pReq->u.Internal.cArgs * sizeof(uintptr_t);
979	# ifdef __GNUC__
980	__asm__ __volatile__("movl %%esp, %%edx\n\t"
981	"subl %2, %%esp\n\t"
982	"andl $0xfffffff0, %%esp\n\t"
983	"shrl $2, %2\n\t"
984	"movl %%esp, %%edi\n\t"
985	"rep movsl\n\t"
986	"movl %%edx, %%edi\n\t"
987	"call *%%eax\n\t"
988	"mov %%edi, %%esp\n\t"
989	: "=a" (rcRet),
990	"=S" (pauArgs),
991	"=c" (cbArgs)
992	: "0" (u.pfn),
993	"1" (pauArgs),
994	"2" (cbArgs)
995	: "edi", "edx");
996	# else
997	__asm
998	{
999	xor edx, edx /* just mess it up. */
1000	mov eax, u.pfn
1001	mov ecx, cbArgs
1002	shr ecx, 2
1003	mov esi, pauArgs
1004	mov ebx, esp
1005	sub esp, cbArgs
1006	and esp, 0xfffffff0
1007	mov edi, esp
1008	rep movsd
1009	call eax
1010	mov esp, ebx
1011	mov rcRet, eax
1012	}
1013	# endif
1014	#endif /* x86 */
1015	if ((pReq->fFlags & (VMREQFLAGS_RETURN_MASK)) == VMREQFLAGS_VOID)
1016	rcRet = VINF_SUCCESS;
1017	rcReq = rcRet;
1018	break;
1019	}
1020
1021	default:
1022	AssertMsgFailed(("pReq->enmType=%d\n", pReq->enmType));
1023	rcReq = VERR_NOT_IMPLEMENTED;
1024	break;
1025	}
1026
1027	/*
1028	* Complete the request.
1029	*/
1030	pReq->iStatus = rcReq;
1031	pReq->enmState = VMREQSTATE_COMPLETED;
1032	if (pReq->fFlags & VMREQFLAGS_NO_WAIT)
1033	{
1034	/* Free the packet, nobody is waiting. */
1035	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - freeing it\n",
1036	pReq, rcReq, rcRet));
1037	VMR3ReqFree(pReq);
1038	}
1039	else
1040	{
1041	/* Notify the waiter and him free up the packet. */
1042	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - notifying waiting thread\n",
1043	pReq, rcReq, rcRet));
1044	ASMAtomicXchgSize(&pReq->fEventSemClear, false);
1045	int rc2 = RTSemEventSignal(pReq->EventSem);
1046	if (RT_FAILURE(rc2))
1047	{
1048	AssertRC(rc2);
1049	rcRet = rc2;
1050	}
1051	}
1052	return rcRet;
1053	}
1054
1055
1056
1057

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source: vbox/trunk/src/VBox/VMM/VMReq.cpp@ 13824

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