VMReq.cpp@ 97405

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1	/* $Id: VMReq.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 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_VM
33	#include <VBox/vmm/mm.h>
34	#include <VBox/vmm/vmm.h>
35	#include "VMInternal.h"
36	#include <VBox/vmm/vm.h>
37	#include <VBox/vmm/uvm.h>
38
39	#include <VBox/err.h>
40	#include <VBox/param.h>
41	#include <VBox/log.h>
42	#include <iprt/assert.h>
43	#include <iprt/asm.h>
44	#include <iprt/string.h>
45	#include <iprt/time.h>
46	#include <iprt/semaphore.h>
47	#include <iprt/thread.h>
48
49
50	/*********************************************************************************************************************************
51	* Internal Functions *
52	*********************************************************************************************************************************/
53	static int vmR3ReqProcessOne(PVMREQ pReq);
54
55
56	/**
57	* Convenience wrapper for VMR3ReqCallU.
58	*
59	* This assumes (1) you're calling a function that returns an VBox status code,
60	* (2) that you want it's return code on success, and (3) that you wish to wait
61	* for ever for it to return.
62	*
63	* @returns VBox status code. In the unlikely event that VMR3ReqCallVU fails,
64	* its status code is return. Otherwise, the status of pfnFunction is
65	* returned.
66	*
67	* @param pVM The cross context VM structure.
68	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
69	* one of the following special values:
70	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
71	* @param pfnFunction Pointer to the function to call.
72	* @param cArgs Number of arguments following in the ellipsis.
73	* @param ... Function arguments.
74	*
75	* @remarks See remarks on VMR3ReqCallVU.
76	* @internal
77	*/
78	VMMR3_INT_DECL(int) VMR3ReqCallWait(PVM pVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
79	{
80	PVMREQ pReq;
81	va_list va;
82	va_start(va, cArgs);
83	int rc = VMR3ReqCallVU(pVM->pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VBOX_STATUS,
84	pfnFunction, cArgs, va);
85	va_end(va);
86	if (RT_SUCCESS(rc))
87	rc = pReq->iStatus;
88	VMR3ReqFree(pReq);
89	return rc;
90	}
91
92
93	/**
94	* Convenience wrapper for VMR3ReqCallU.
95	*
96	* This assumes (1) you're calling a function that returns an VBox status code,
97	* (2) that you want it's return code on success, and (3) that you wish to wait
98	* for ever for it to return.
99	*
100	* @returns VBox status code. In the unlikely event that VMR3ReqCallVU fails,
101	* its status code is return. Otherwise, the status of pfnFunction is
102	* returned.
103	*
104	* @param pUVM The user mode VM structure.
105	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
106	* one of the following special values:
107	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
108	* @param pfnFunction Pointer to the function to call.
109	* @param cArgs Number of arguments following in the ellipsis.
110	* @param ... Function arguments.
111	*
112	* @remarks See remarks on VMR3ReqCallVU.
113	* @internal
114	*/
115	VMMR3DECL(int) VMR3ReqCallWaitU(PUVM pUVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
116	{
117	PVMREQ pReq;
118	va_list va;
119	va_start(va, cArgs);
120	int rc = VMR3ReqCallVU(pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VBOX_STATUS,
121	pfnFunction, cArgs, va);
122	va_end(va);
123	if (RT_SUCCESS(rc))
124	rc = pReq->iStatus;
125	VMR3ReqFree(pReq);
126	return rc;
127	}
128
129
130	/**
131	* Convenience wrapper for VMR3ReqCallU.
132	*
133	* This assumes (1) you're calling a function that returns an VBox status code
134	* and that you do not wish to wait for it to complete.
135	*
136	* @returns VBox status code returned by VMR3ReqCallVU.
137	*
138	* @param pVM The cross context VM structure.
139	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
140	* one of the following special values:
141	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
142	* @param pfnFunction Pointer to the function to call.
143	* @param cArgs Number of arguments following in the ellipsis.
144	* @param ... Function arguments.
145	*
146	* @remarks See remarks on VMR3ReqCallVU.
147	* @internal
148	*/
149	VMMR3DECL(int) VMR3ReqCallNoWait(PVM pVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
150	{
151	va_list va;
152	va_start(va, cArgs);
153	int rc = VMR3ReqCallVU(pVM->pUVM, idDstCpu, NULL, 0, VMREQFLAGS_VBOX_STATUS \| VMREQFLAGS_NO_WAIT,
154	pfnFunction, cArgs, va);
155	va_end(va);
156	return rc;
157	}
158
159
160	/**
161	* Convenience wrapper for VMR3ReqCallU.
162	*
163	* This assumes (1) you're calling a function that returns an VBox status code
164	* and that you do not wish to wait for it to complete.
165	*
166	* @returns VBox status code returned by VMR3ReqCallVU.
167	*
168	* @param pUVM Pointer to the VM.
169	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
170	* one of the following special values:
171	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
172	* @param pfnFunction Pointer to the function to call.
173	* @param cArgs Number of arguments following in the ellipsis.
174	* @param ... Function arguments.
175	*
176	* @remarks See remarks on VMR3ReqCallVU.
177	*/
178	VMMR3DECL(int) VMR3ReqCallNoWaitU(PUVM pUVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
179	{
180	va_list va;
181	va_start(va, cArgs);
182	int rc = VMR3ReqCallVU(pUVM, idDstCpu, NULL, 0, VMREQFLAGS_VBOX_STATUS \| VMREQFLAGS_NO_WAIT,
183	pfnFunction, cArgs, va);
184	va_end(va);
185	return rc;
186	}
187
188
189	/**
190	* Convenience wrapper for VMR3ReqCallU.
191	*
192	* This assumes (1) you're calling a function that returns void, and (2) that
193	* you wish to wait for ever for it to return.
194	*
195	* @returns VBox status code of VMR3ReqCallVU.
196	*
197	* @param pVM The cross context VM structure.
198	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
199	* one of the following special values:
200	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
201	* @param pfnFunction Pointer to the function to call.
202	* @param cArgs Number of arguments following in the ellipsis.
203	* @param ... Function arguments.
204	*
205	* @remarks See remarks on VMR3ReqCallVU.
206	* @internal
207	*/
208	VMMR3_INT_DECL(int) VMR3ReqCallVoidWait(PVM pVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
209	{
210	PVMREQ pReq;
211	va_list va;
212	va_start(va, cArgs);
213	int rc = VMR3ReqCallVU(pVM->pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VOID,
214	pfnFunction, cArgs, va);
215	va_end(va);
216	VMR3ReqFree(pReq);
217	return rc;
218	}
219
220
221	/**
222	* Convenience wrapper for VMR3ReqCallU.
223	*
224	* This assumes (1) you're calling a function that returns void, and (2) that
225	* you wish to wait for ever for it to return.
226	*
227	* @returns VBox status code of VMR3ReqCallVU.
228	*
229	* @param pUVM Pointer to the VM.
230	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
231	* one of the following special values:
232	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
233	* @param pfnFunction Pointer to the function to call.
234	* @param cArgs Number of arguments following in the ellipsis.
235	* @param ... Function arguments.
236	*
237	* @remarks See remarks on VMR3ReqCallVU.
238	*/
239	VMMR3DECL(int) VMR3ReqCallVoidWaitU(PUVM pUVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
240	{
241	PVMREQ pReq;
242	va_list va;
243	va_start(va, cArgs);
244	int rc = VMR3ReqCallVU(pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VOID,
245	pfnFunction, cArgs, va);
246	va_end(va);
247	VMR3ReqFree(pReq);
248	return rc;
249	}
250
251
252	/**
253	* Convenience wrapper for VMR3ReqCallU.
254	*
255	* This assumes (1) you're calling a function that returns void, and (2) that
256	* you do not wish to wait for it to complete.
257	*
258	* @returns VBox status code of VMR3ReqCallVU.
259	*
260	* @param pVM The cross context VM structure.
261	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
262	* one of the following special values:
263	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
264	* @param pfnFunction Pointer to the function to call.
265	* @param cArgs Number of arguments following in the ellipsis.
266	* @param ... Function arguments.
267	*
268	* @remarks See remarks on VMR3ReqCallVU.
269	* @internal
270	*/
271	VMMR3DECL(int) VMR3ReqCallVoidNoWait(PVM pVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
272	{
273	PVMREQ pReq;
274	va_list va;
275	va_start(va, cArgs);
276	int rc = VMR3ReqCallVU(pVM->pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VOID \| VMREQFLAGS_NO_WAIT,
277	pfnFunction, cArgs, va);
278	va_end(va);
279	VMR3ReqFree(pReq);
280	return rc;
281	}
282
283
284	/**
285	* Convenience wrapper for VMR3ReqCallU.
286	*
287	* This assumes (1) you're calling a function that returns an VBox status code,
288	* (2) that you want it's return code on success, (3) that you wish to wait for
289	* ever for it to return, and (4) that it's priority request that can be safely
290	* be handled during async suspend and power off.
291	*
292	* @returns VBox status code. In the unlikely event that VMR3ReqCallVU fails,
293	* its status code is return. Otherwise, the status of pfnFunction is
294	* returned.
295	*
296	* @param pVM The cross context VM structure.
297	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
298	* one of the following special values:
299	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
300	* @param pfnFunction Pointer to the function to call.
301	* @param cArgs Number of arguments following in the ellipsis.
302	* @param ... Function arguments.
303	*
304	* @remarks See remarks on VMR3ReqCallVU.
305	* @internal
306	*/
307	VMMR3DECL(int) VMR3ReqPriorityCallWait(PVM pVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
308	{
309	PVMREQ pReq;
310	va_list va;
311	va_start(va, cArgs);
312	int rc = VMR3ReqCallVU(pVM->pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VBOX_STATUS \| VMREQFLAGS_PRIORITY,
313	pfnFunction, cArgs, va);
314	va_end(va);
315	if (RT_SUCCESS(rc))
316	rc = pReq->iStatus;
317	VMR3ReqFree(pReq);
318	return rc;
319	}
320
321
322	/**
323	* Convenience wrapper for VMR3ReqCallU.
324	*
325	* This assumes (1) you're calling a function that returns an VBox status code,
326	* (2) that you want it's return code on success, (3) that you wish to wait for
327	* ever for it to return, and (4) that it's priority request that can be safely
328	* be handled during async suspend and power off.
329	*
330	* @returns VBox status code. In the unlikely event that VMR3ReqCallVU fails,
331	* its status code is return. Otherwise, the status of pfnFunction is
332	* returned.
333	*
334	* @param pUVM The user mode VM handle.
335	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
336	* one of the following special values:
337	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
338	* @param pfnFunction Pointer to the function to call.
339	* @param cArgs Number of arguments following in the ellipsis.
340	* @param ... Function arguments.
341	*
342	* @remarks See remarks on VMR3ReqCallVU.
343	*/
344	VMMR3DECL(int) VMR3ReqPriorityCallWaitU(PUVM pUVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
345	{
346	PVMREQ pReq;
347	va_list va;
348	va_start(va, cArgs);
349	int rc = VMR3ReqCallVU(pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VBOX_STATUS \| VMREQFLAGS_PRIORITY,
350	pfnFunction, cArgs, va);
351	va_end(va);
352	if (RT_SUCCESS(rc))
353	rc = pReq->iStatus;
354	VMR3ReqFree(pReq);
355	return rc;
356	}
357
358
359	/**
360	* Convenience wrapper for VMR3ReqCallU.
361	*
362	* This assumes (1) you're calling a function that returns void, (2) that you
363	* wish to wait for ever for it to return, and (3) that it's priority request
364	* that can be safely be handled during async suspend and power off.
365	*
366	* @returns VBox status code of VMR3ReqCallVU.
367	*
368	* @param pUVM The user mode VM handle.
369	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
370	* one of the following special values:
371	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
372	* @param pfnFunction Pointer to the function to call.
373	* @param cArgs Number of arguments following in the ellipsis.
374	* @param ... Function arguments.
375	*
376	* @remarks See remarks on VMR3ReqCallVU.
377	*/
378	VMMR3DECL(int) VMR3ReqPriorityCallVoidWaitU(PUVM pUVM, VMCPUID idDstCpu, PFNRT pfnFunction, unsigned cArgs, ...)
379	{
380	PVMREQ pReq;
381	va_list va;
382	va_start(va, cArgs);
383	int rc = VMR3ReqCallVU(pUVM, idDstCpu, &pReq, RT_INDEFINITE_WAIT, VMREQFLAGS_VOID \| VMREQFLAGS_PRIORITY,
384	pfnFunction, cArgs, va);
385	va_end(va);
386	VMR3ReqFree(pReq);
387	return rc;
388	}
389
390
391	/**
392	* Allocate and queue a call request to a void function.
393	*
394	* If it's desired to poll on the completion of the request set cMillies
395	* to 0 and use VMR3ReqWait() to check for completion. In the other case
396	* use RT_INDEFINITE_WAIT.
397	* The returned request packet must be freed using VMR3ReqFree().
398	*
399	* @returns VBox status code.
400	* Will not return VERR_INTERRUPTED.
401	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
402	*
403	* @param pUVM Pointer to the user mode VM structure.
404	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
405	* one of the following special values:
406	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
407	* @param ppReq Where to store the pointer to the request.
408	* This will be NULL or a valid request pointer not matter what happens, unless fFlags
409	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
410	* @param cMillies Number of milliseconds to wait for the request to
411	* be completed. Use RT_INDEFINITE_WAIT to only
412	* wait till it's completed.
413	* @param fFlags A combination of the VMREQFLAGS values.
414	* @param pfnFunction Pointer to the function to call.
415	* @param cArgs Number of arguments following in the ellipsis.
416	* @param ... Function arguments.
417	*
418	* @remarks See remarks on VMR3ReqCallVU.
419	*/
420	VMMR3DECL(int) VMR3ReqCallU(PUVM pUVM, VMCPUID idDstCpu, PVMREQ *ppReq, RTMSINTERVAL cMillies, uint32_t fFlags,
421	PFNRT pfnFunction, unsigned cArgs, ...)
422	{
423	va_list va;
424	va_start(va, cArgs);
425	int rc = VMR3ReqCallVU(pUVM, idDstCpu, ppReq, cMillies, fFlags, pfnFunction, cArgs, va);
426	va_end(va);
427	return rc;
428	}
429
430
431	/**
432	* Allocate and queue a call request.
433	*
434	* If it's desired to poll on the completion of the request set cMillies
435	* to 0 and use VMR3ReqWait() to check for completion. In the other case
436	* use RT_INDEFINITE_WAIT.
437	* The returned request packet must be freed using VMR3ReqFree().
438	*
439	* @returns VBox status code.
440	* Will not return VERR_INTERRUPTED.
441	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
442	*
443	* @param pUVM Pointer to the user mode VM structure.
444	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
445	* one of the following special values:
446	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
447	* @param ppReq Where to store the pointer to the request.
448	* This will be NULL or a valid request pointer not matter what happens, unless fFlags
449	* contains VMREQFLAGS_NO_WAIT when it will be optional and always NULL.
450	* @param cMillies Number of milliseconds to wait for the request to
451	* be completed. Use RT_INDEFINITE_WAIT to only
452	* wait till it's completed.
453	* @param pfnFunction Pointer to the function to call.
454	* @param fFlags A combination of the VMREQFLAGS values.
455	* @param cArgs Number of arguments following in the ellipsis.
456	* Stuff which differs in size from uintptr_t is gonna make trouble, so don't try!
457	* @param Args Argument vector.
458	*
459	* @remarks Caveats:
460	* - Do not pass anything which is larger than an uintptr_t.
461	* - 64-bit integers are larger than uintptr_t on 32-bit hosts.
462	* Pass integers > 32-bit by reference (pointers).
463	* - Don't use NULL since it should be the integer 0 in C++ and may
464	* therefore end up with garbage in the bits 63:32 on 64-bit
465	* hosts because 'int' is 32-bit.
466	* Use (void *)NULL or (uintptr_t)0 instead of NULL.
467	*/
468	VMMR3DECL(int) VMR3ReqCallVU(PUVM pUVM, VMCPUID idDstCpu, PVMREQ *ppReq, RTMSINTERVAL cMillies, uint32_t fFlags,
469	PFNRT pfnFunction, unsigned cArgs, va_list Args)
470	{
471	LogFlow(("VMR3ReqCallV: idDstCpu=%u cMillies=%d fFlags=%#x pfnFunction=%p cArgs=%d\n", idDstCpu, cMillies, fFlags, pfnFunction, cArgs));
472
473	/*
474	* Validate input.
475	*/
476	AssertPtrReturn(pfnFunction, VERR_INVALID_POINTER);
477	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
478	AssertReturn(!(fFlags & ~(VMREQFLAGS_RETURN_MASK \| VMREQFLAGS_NO_WAIT \| VMREQFLAGS_POKE \| VMREQFLAGS_PRIORITY)), VERR_INVALID_PARAMETER);
479	if (!(fFlags & VMREQFLAGS_NO_WAIT) \|\| ppReq)
480	{
481	AssertPtrReturn(ppReq, VERR_INVALID_POINTER);
482	*ppReq = NULL;
483	}
484	PVMREQ pReq = NULL;
485	AssertMsgReturn(cArgs * sizeof(uintptr_t) <= sizeof(pReq->u.Internal.aArgs),
486	("cArg=%d\n", cArgs),
487	VERR_TOO_MUCH_DATA);
488
489	/*
490	* Allocate request
491	*/
492	int rc = VMR3ReqAlloc(pUVM, &pReq, VMREQTYPE_INTERNAL, idDstCpu);
493	if (RT_FAILURE(rc))
494	return rc;
495
496	/*
497	* Initialize the request data.
498	*/
499	pReq->fFlags = fFlags;
500	pReq->u.Internal.pfn = pfnFunction;
501	pReq->u.Internal.cArgs = cArgs;
502	for (unsigned iArg = 0; iArg < cArgs; iArg++)
503	pReq->u.Internal.aArgs[iArg] = va_arg(Args, uintptr_t);
504
505	/*
506	* Queue the request and return.
507	*/
508	rc = VMR3ReqQueue(pReq, cMillies);
509	if ( RT_FAILURE(rc)
510	&& rc != VERR_TIMEOUT)
511	{
512	VMR3ReqFree(pReq);
513	pReq = NULL;
514	}
515	if (!(fFlags & VMREQFLAGS_NO_WAIT))
516	{
517	*ppReq = pReq;
518	LogFlow(("VMR3ReqCallV: returns %Rrc *ppReq=%p\n", rc, pReq));
519	}
520	else
521	LogFlow(("VMR3ReqCallV: returns %Rrc\n", rc));
522	Assert(rc != VERR_INTERRUPTED);
523	return rc;
524	}
525
526
527	/**
528	* Joins the list pList with whatever is linked up at *pHead.
529	*/
530	static void vmr3ReqJoinFreeSub(volatile PVMREQ *ppHead, PVMREQ pList)
531	{
532	for (unsigned cIterations = 0;; cIterations++)
533	{
534	PVMREQ pHead = ASMAtomicXchgPtrT(ppHead, pList, PVMREQ);
535	if (!pHead)
536	return;
537	PVMREQ pTail = pHead;
538	while (pTail->pNext)
539	pTail = pTail->pNext;
540	ASMAtomicWritePtr(&pTail->pNext, pList);
541	ASMCompilerBarrier();
542	if (ASMAtomicCmpXchgPtr(ppHead, pHead, pList))
543	return;
544	ASMAtomicWriteNullPtr(&pTail->pNext);
545	ASMCompilerBarrier();
546	if (ASMAtomicCmpXchgPtr(ppHead, pHead, NULL))
547	return;
548	pList = pHead;
549	Assert(cIterations != 32);
550	Assert(cIterations != 64);
551	}
552	}
553
554
555	/**
556	* Joins the list pList with whatever is linked up at *pHead.
557	*/
558	static void vmr3ReqJoinFree(PVMINTUSERPERVM pVMInt, PVMREQ pList)
559	{
560	/*
561	* Split the list if it's too long.
562	*/
563	unsigned cReqs = 1;
564	PVMREQ pTail = pList;
565	while (pTail->pNext)
566	{
567	if (cReqs++ > 25)
568	{
569	const uint32_t i = pVMInt->iReqFree;
570	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2) % RT_ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
571
572	pTail->pNext = NULL;
573	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(i + 2 + (i == pVMInt->iReqFree)) % RT_ELEMENTS(pVMInt->apReqFree)], pTail->pNext);
574	return;
575	}
576	pTail = pTail->pNext;
577	}
578	vmr3ReqJoinFreeSub(&pVMInt->apReqFree[(pVMInt->iReqFree + 2) % RT_ELEMENTS(pVMInt->apReqFree)], pList);
579	}
580
581
582	/**
583	* Allocates a request packet.
584	*
585	* The caller allocates a request packet, fills in the request data
586	* union and queues the request.
587	*
588	* @returns VBox status code.
589	*
590	* @param pUVM Pointer to the user mode VM structure.
591	* @param ppReq Where to store the pointer to the allocated packet.
592	* @param enmType Package type.
593	* @param idDstCpu The destination CPU(s). Either a specific CPU ID or
594	* one of the following special values:
595	* VMCPUID_ANY, VMCPUID_ANY_QUEUE, VMCPUID_ALL or VMCPUID_ALL_REVERSE.
596	*/
597	VMMR3DECL(int) VMR3ReqAlloc(PUVM pUVM, PVMREQ *ppReq, VMREQTYPE enmType, VMCPUID idDstCpu)
598	{
599	/*
600	* Validate input.
601	*/
602	AssertMsgReturn(enmType > VMREQTYPE_INVALID && enmType < VMREQTYPE_MAX,
603	("Invalid package type %d valid range %d-%d inclusively.\n",
604	enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
605	VERR_VM_REQUEST_INVALID_TYPE);
606	AssertPtrReturn(ppReq, VERR_INVALID_POINTER);
607	AssertMsgReturn( idDstCpu == VMCPUID_ANY
608	\|\| idDstCpu == VMCPUID_ANY_QUEUE
609	\|\| idDstCpu < pUVM->cCpus
610	\|\| idDstCpu == VMCPUID_ALL
611	\|\| idDstCpu == VMCPUID_ALL_REVERSE,
612	("Invalid destination %u (max=%u)\n", idDstCpu, pUVM->cCpus), VERR_INVALID_PARAMETER);
613
614	/*
615	* Try get a recycled packet.
616	* While this could all be solved with a single list with a lock, it's a sport
617	* of mine to avoid locks.
618	*/
619	int cTries = RT_ELEMENTS(pUVM->vm.s.apReqFree) * 2;
620	while (--cTries >= 0)
621	{
622	PVMREQ volatile *ppHead = &pUVM->vm.s.apReqFree[ASMAtomicIncU32(&pUVM->vm.s.iReqFree) % RT_ELEMENTS(pUVM->vm.s.apReqFree)];
623	#if 0 /* sad, but this won't work safely because the reading of pReq->pNext. */
624	PVMREQ pNext = NULL;
625	PVMREQ pReq = *ppHead;
626	if ( pReq
627	&& !ASMAtomicCmpXchgPtr(ppHead, (pNext = pReq->pNext), pReq)
628	&& (pReq = *ppHead)
629	&& !ASMAtomicCmpXchgPtr(ppHead, (pNext = pReq->pNext), pReq))
630	pReq = NULL;
631	if (pReq)
632	{
633	Assert(pReq->pNext == pNext); NOREF(pReq);
634	#else
635	PVMREQ pReq = ASMAtomicXchgPtrT(ppHead, NULL, PVMREQ);
636	if (pReq)
637	{
638	PVMREQ pNext = pReq->pNext;
639	if ( pNext
640	&& !ASMAtomicCmpXchgPtr(ppHead, pNext, NULL))
641	{
642	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocRaces);
643	vmr3ReqJoinFree(&pUVM->vm.s, pReq->pNext);
644	}
645	#endif
646	ASMAtomicDecU32(&pUVM->vm.s.cReqFree);
647
648	/*
649	* Make sure the event sem is not signaled.
650	*/
651	if (!pReq->fEventSemClear)
652	{
653	int rc = RTSemEventWait(pReq->EventSem, 0);
654	if (rc != VINF_SUCCESS && rc != VERR_TIMEOUT)
655	{
656	/*
657	* This shall not happen, but if it does we'll just destroy
658	* the semaphore and create a new one.
659	*/
660	AssertMsgFailed(("rc=%Rrc from RTSemEventWait(%#x).\n", rc, pReq->EventSem));
661	RTSemEventDestroy(pReq->EventSem);
662	rc = RTSemEventCreate(&pReq->EventSem);
663	AssertRC(rc);
664	if (RT_FAILURE(rc))
665	return rc;
666	#if 0 /// @todo @bugref{4725} - def RT_LOCK_STRICT
667	for (VMCPUID idCpu = 0; idCpu < pUVM->cCpus; idCpu++)
668	RTSemEventAddSignaller(pReq->EventSem, pUVM->aCpus[idCpu].vm.s.ThreadEMT);
669	#endif
670	}
671	pReq->fEventSemClear = true;
672	}
673	else
674	Assert(RTSemEventWait(pReq->EventSem, 0) == VERR_TIMEOUT);
675
676	/*
677	* Initialize the packet and return it.
678	*/
679	Assert(pReq->enmType == VMREQTYPE_INVALID);
680	Assert(pReq->enmState == VMREQSTATE_FREE);
681	Assert(pReq->pUVM == pUVM);
682	ASMAtomicWriteNullPtr(&pReq->pNext);
683	pReq->enmState = VMREQSTATE_ALLOCATED;
684	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
685	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
686	pReq->enmType = enmType;
687	pReq->idDstCpu = idDstCpu;
688
689	*ppReq = pReq;
690	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocRecycled);
691	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p recycled\n", pReq));
692	return VINF_SUCCESS;
693	}
694	}
695
696	/*
697	* Ok allocate one.
698	*/
699	PVMREQ pReq = (PVMREQ)MMR3HeapAllocU(pUVM, MM_TAG_VM_REQ, sizeof(*pReq));
700	if (!pReq)
701	return VERR_NO_MEMORY;
702
703	/*
704	* Create the semaphore.
705	*/
706	int rc = RTSemEventCreate(&pReq->EventSem);
707	AssertRC(rc);
708	if (RT_FAILURE(rc))
709	{
710	MMR3HeapFree(pReq);
711	return rc;
712	}
713	#if 0 /// @todo @bugref{4725} - def RT_LOCK_STRICT
714	for (VMCPUID idCpu = 0; idCpu < pUVM->cCpus; idCpu++)
715	RTSemEventAddSignaller(pReq->EventSem, pUVM->aCpus[idCpu].vm.s.ThreadEMT);
716	#endif
717
718	/*
719	* Initialize the packet and return it.
720	*/
721	pReq->pNext = NULL;
722	pReq->pUVM = pUVM;
723	pReq->enmState = VMREQSTATE_ALLOCATED;
724	pReq->iStatus = VERR_VM_REQUEST_STATUS_STILL_PENDING;
725	pReq->fEventSemClear = true;
726	pReq->fFlags = VMREQFLAGS_VBOX_STATUS;
727	pReq->enmType = enmType;
728	pReq->idDstCpu = idDstCpu;
729
730	*ppReq = pReq;
731	STAM_COUNTER_INC(&pUVM->vm.s.StatReqAllocNew);
732	LogFlow(("VMR3ReqAlloc: returns VINF_SUCCESS *ppReq=%p new\n", pReq));
733	return VINF_SUCCESS;
734	}
735
736
737	/**
738	* Free a request packet.
739	*
740	* @returns VBox status code.
741	*
742	* @param pReq Package to free.
743	* @remark The request packet must be in allocated or completed state!
744	*/
745	VMMR3DECL(int) VMR3ReqFree(PVMREQ pReq)
746	{
747	/*
748	* Ignore NULL (all free functions should do this imho).
749	*/
750	if (!pReq)
751	return VINF_SUCCESS;
752
753	/*
754	* Check packet state.
755	*/
756	switch (pReq->enmState)
757	{
758	case VMREQSTATE_ALLOCATED:
759	case VMREQSTATE_COMPLETED:
760	break;
761	default:
762	AssertMsgFailed(("Invalid state %d!\n", pReq->enmState));
763	return VERR_VM_REQUEST_STATE;
764	}
765
766	/*
767	* Make it a free packet and put it into one of the free packet lists.
768	*/
769	pReq->enmState = VMREQSTATE_FREE;
770	pReq->iStatus = VERR_VM_REQUEST_STATUS_FREED;
771	pReq->enmType = VMREQTYPE_INVALID;
772
773	PUVM pUVM = pReq->pUVM;
774	STAM_COUNTER_INC(&pUVM->vm.s.StatReqFree);
775
776	if (pUVM->vm.s.cReqFree < 128)
777	{
778	ASMAtomicIncU32(&pUVM->vm.s.cReqFree);
779	PVMREQ volatile *ppHead = &pUVM->vm.s.apReqFree[ASMAtomicIncU32(&pUVM->vm.s.iReqFree) % RT_ELEMENTS(pUVM->vm.s.apReqFree)];
780	PVMREQ pNext;
781	do
782	{
783	pNext = ASMAtomicUoReadPtrT(ppHead, PVMREQ);
784	ASMAtomicWritePtr(&pReq->pNext, pNext);
785	ASMCompilerBarrier();
786	} while (!ASMAtomicCmpXchgPtr(ppHead, pReq, pNext));
787	}
788	else
789	{
790	STAM_COUNTER_INC(&pReq->pUVM->vm.s.StatReqFreeOverflow);
791	RTSemEventDestroy(pReq->EventSem);
792	MMR3HeapFree(pReq);
793	}
794	return VINF_SUCCESS;
795	}
796
797
798	/**
799	* Queue a request.
800	*
801	* The quest must be allocated using VMR3ReqAlloc() and contain
802	* all the required data.
803	* If it's desired to poll on the completion of the request set cMillies
804	* to 0 and use VMR3ReqWait() to check for completion. In the other case
805	* use RT_INDEFINITE_WAIT.
806	*
807	* @returns VBox status code.
808	* Will not return VERR_INTERRUPTED.
809	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
810	*
811	* @param pReq The request to queue.
812	* @param cMillies Number of milliseconds to wait for the request to
813	* be completed. Use RT_INDEFINITE_WAIT to only
814	* wait till it's completed.
815	*/
816	VMMR3DECL(int) VMR3ReqQueue(PVMREQ pReq, RTMSINTERVAL cMillies)
817	{
818	LogFlow(("VMR3ReqQueue: pReq=%p cMillies=%d\n", pReq, cMillies));
819	/*
820	* Verify the supplied package.
821	*/
822	AssertMsgReturn(pReq->enmState == VMREQSTATE_ALLOCATED, ("%d\n", pReq->enmState), VERR_VM_REQUEST_STATE);
823	AssertMsgReturn( RT_VALID_PTR(pReq->pUVM)
824	&& !pReq->pNext
825	&& pReq->EventSem != NIL_RTSEMEVENT,
826	("Invalid request package! Anyone cooking their own packages???\n"),
827	VERR_VM_REQUEST_INVALID_PACKAGE);
828	AssertMsgReturn( pReq->enmType > VMREQTYPE_INVALID
829	&& pReq->enmType < VMREQTYPE_MAX,
830	("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n",
831	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
832	VERR_VM_REQUEST_INVALID_TYPE);
833	Assert(!(pReq->fFlags & ~(VMREQFLAGS_RETURN_MASK \| VMREQFLAGS_NO_WAIT \| VMREQFLAGS_POKE \| VMREQFLAGS_PRIORITY)));
834
835	/*
836	* Are we the EMT or not?
837	* Also, store pVM (and fFlags) locally since pReq may be invalid after queuing it.
838	*/
839	int rc = VINF_SUCCESS;
840	PUVM pUVM = ((VMREQ volatile )pReq)->pUVM; / volatile paranoia */
841	PUVMCPU pUVCpu = (PUVMCPU)RTTlsGet(pUVM->vm.s.idxTLS);
842
843	if (pReq->idDstCpu == VMCPUID_ALL)
844	{
845	/* One-by-one. */
846	Assert(!(pReq->fFlags & VMREQFLAGS_NO_WAIT));
847	for (unsigned i = 0; i < pUVM->cCpus; i++)
848	{
849	/* Reinit some members. */
850	pReq->enmState = VMREQSTATE_ALLOCATED;
851	pReq->idDstCpu = i;
852	rc = VMR3ReqQueue(pReq, cMillies);
853	if (RT_FAILURE(rc))
854	break;
855	}
856	}
857	else if (pReq->idDstCpu == VMCPUID_ALL_REVERSE)
858	{
859	/* One-by-one. */
860	Assert(!(pReq->fFlags & VMREQFLAGS_NO_WAIT));
861	for (int i = pUVM->cCpus-1; i >= 0; i--)
862	{
863	/* Reinit some members. */
864	pReq->enmState = VMREQSTATE_ALLOCATED;
865	pReq->idDstCpu = i;
866	rc = VMR3ReqQueue(pReq, cMillies);
867	if (RT_FAILURE(rc))
868	break;
869	}
870	}
871	else if ( pReq->idDstCpu != VMCPUID_ANY /* for a specific VMCPU? */
872	&& pReq->idDstCpu != VMCPUID_ANY_QUEUE
873	&& ( !pUVCpu /* and it's not the current thread. */
874	\|\| pUVCpu->idCpu != pReq->idDstCpu))
875	{
876	VMCPUID idTarget = pReq->idDstCpu; Assert(idTarget < pUVM->cCpus);
877	PVMCPU pVCpu = pUVM->pVM->apCpusR3[idTarget];
878	unsigned fFlags = ((VMREQ volatile )pReq)->fFlags; / volatile paranoia */
879
880	/* Fetch the right UVMCPU */
881	pUVCpu = &pUVM->aCpus[idTarget];
882
883	/*
884	* Insert it.
885	*/
886	volatile PVMREQ *ppQueueHead = pReq->fFlags & VMREQFLAGS_PRIORITY ? &pUVCpu->vm.s.pPriorityReqs : &pUVCpu->vm.s.pNormalReqs;
887	pReq->enmState = VMREQSTATE_QUEUED;
888	PVMREQ pNext;
889	do
890	{
891	pNext = ASMAtomicUoReadPtrT(ppQueueHead, PVMREQ);
892	ASMAtomicWritePtr(&pReq->pNext, pNext);
893	ASMCompilerBarrier();
894	} while (!ASMAtomicCmpXchgPtr(ppQueueHead, pReq, pNext));
895
896	/*
897	* Notify EMT.
898	*/
899	if (pUVM->pVM)
900	VMCPU_FF_SET(pVCpu, VMCPU_FF_REQUEST);
901	VMR3NotifyCpuFFU(pUVCpu, fFlags & VMREQFLAGS_POKE ? VMNOTIFYFF_FLAGS_POKE : 0);
902
903	/*
904	* Wait and return.
905	*/
906	if (!(fFlags & VMREQFLAGS_NO_WAIT))
907	rc = VMR3ReqWait(pReq, cMillies);
908	LogFlow(("VMR3ReqQueue: returns %Rrc\n", rc));
909	}
910	else if ( ( pReq->idDstCpu == VMCPUID_ANY
911	&& !pUVCpu /* only EMT threads have a valid pointer stored in the TLS slot. */)
912	\|\| pReq->idDstCpu == VMCPUID_ANY_QUEUE)
913	{
914	unsigned fFlags = ((VMREQ volatile )pReq)->fFlags; / volatile paranoia */
915
916	/* Note: pUVCpu may or may not be NULL in the VMCPUID_ANY_QUEUE case; we don't care. */
917
918	/*
919	* Insert it.
920	*/
921	volatile PVMREQ *ppQueueHead = pReq->fFlags & VMREQFLAGS_PRIORITY ? &pUVM->vm.s.pPriorityReqs : &pUVM->vm.s.pNormalReqs;
922	pReq->enmState = VMREQSTATE_QUEUED;
923	PVMREQ pNext;
924	do
925	{
926	pNext = ASMAtomicUoReadPtrT(ppQueueHead, PVMREQ);
927	ASMAtomicWritePtr(&pReq->pNext, pNext);
928	ASMCompilerBarrier();
929	} while (!ASMAtomicCmpXchgPtr(ppQueueHead, pReq, pNext));
930
931	/*
932	* Notify EMT.
933	*/
934	if (pUVM->pVM)
935	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST);
936	VMR3NotifyGlobalFFU(pUVM, fFlags & VMREQFLAGS_POKE ? VMNOTIFYFF_FLAGS_POKE : 0);
937
938	/*
939	* Wait and return.
940	*/
941	if (!(fFlags & VMREQFLAGS_NO_WAIT))
942	rc = VMR3ReqWait(pReq, cMillies);
943	LogFlow(("VMR3ReqQueue: returns %Rrc\n", rc));
944	}
945	else
946	{
947	Assert(pUVCpu);
948
949	/*
950	* The requester was an EMT, just execute it.
951	*/
952	pReq->enmState = VMREQSTATE_QUEUED;
953	rc = vmR3ReqProcessOne(pReq);
954	LogFlow(("VMR3ReqQueue: returns %Rrc (processed)\n", rc));
955	}
956	return rc;
957	}
958
959
960	/**
961	* Wait for a request to be completed.
962	*
963	* @returns VBox status code.
964	* @returns VERR_TIMEOUT if cMillies was reached without the packet being completed.
965	*
966	* @param pReq The request to wait for.
967	* @param cMillies Number of milliseconds to wait.
968	* Use RT_INDEFINITE_WAIT to only wait till it's completed.
969	*/
970	VMMR3DECL(int) VMR3ReqWait(PVMREQ pReq, RTMSINTERVAL cMillies)
971	{
972	LogFlow(("VMR3ReqWait: pReq=%p cMillies=%d\n", pReq, cMillies));
973
974	/*
975	* Verify the supplied package.
976	*/
977	AssertMsgReturn( pReq->enmState == VMREQSTATE_QUEUED
978	\|\| pReq->enmState == VMREQSTATE_PROCESSING
979	\|\| pReq->enmState == VMREQSTATE_COMPLETED,
980	("Invalid state %d\n", pReq->enmState),
981	VERR_VM_REQUEST_STATE);
982	AssertMsgReturn( RT_VALID_PTR(pReq->pUVM)
983	&& pReq->EventSem != NIL_RTSEMEVENT,
984	("Invalid request package! Anyone cooking their own packages???\n"),
985	VERR_VM_REQUEST_INVALID_PACKAGE);
986	AssertMsgReturn( pReq->enmType > VMREQTYPE_INVALID
987	&& pReq->enmType < VMREQTYPE_MAX,
988	("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n",
989	pReq->enmType, VMREQTYPE_INVALID + 1, VMREQTYPE_MAX - 1),
990	VERR_VM_REQUEST_INVALID_TYPE);
991
992	/*
993	* Check for deadlock condition
994	*/
995	PUVM pUVM = pReq->pUVM;
996	NOREF(pUVM);
997
998	/*
999	* Wait on the package.
1000	*/
1001	int rc;
1002	if (cMillies != RT_INDEFINITE_WAIT)
1003	rc = RTSemEventWait(pReq->EventSem, cMillies);
1004	else
1005	{
1006	do
1007	{
1008	rc = RTSemEventWait(pReq->EventSem, RT_INDEFINITE_WAIT);
1009	Assert(rc != VERR_TIMEOUT);
1010	} while ( pReq->enmState != VMREQSTATE_COMPLETED
1011	&& pReq->enmState != VMREQSTATE_INVALID);
1012	}
1013	if (RT_SUCCESS(rc))
1014	ASMAtomicXchgSize(&pReq->fEventSemClear, true);
1015	if (pReq->enmState == VMREQSTATE_COMPLETED)
1016	rc = VINF_SUCCESS;
1017	LogFlow(("VMR3ReqWait: returns %Rrc\n", rc));
1018	Assert(rc != VERR_INTERRUPTED);
1019	return rc;
1020	}
1021
1022
1023	/**
1024	* Sets the relevant FF.
1025	*
1026	* @param pUVM Pointer to the user mode VM structure.
1027	* @param idDstCpu VMCPUID_ANY or the ID of the current CPU.
1028	*/
1029	DECLINLINE(void) vmR3ReqSetFF(PUVM pUVM, VMCPUID idDstCpu)
1030	{
1031	if (RT_LIKELY(pUVM->pVM))
1032	{
1033	if (idDstCpu == VMCPUID_ANY)
1034	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST);
1035	else
1036	VMCPU_FF_SET(pUVM->pVM->apCpusR3[idDstCpu], VMCPU_FF_REQUEST);
1037	}
1038	}
1039
1040
1041	/**
1042	* VMR3ReqProcessU helper that handles cases where there are more than one
1043	* pending request.
1044	*
1045	* @returns The oldest request.
1046	* @param pUVM Pointer to the user mode VM structure
1047	* @param idDstCpu VMCPUID_ANY or virtual CPU ID.
1048	* @param pReqList The list of requests.
1049	* @param ppReqs Pointer to the list head.
1050	*/
1051	static PVMREQ vmR3ReqProcessUTooManyHelper(PUVM pUVM, VMCPUID idDstCpu, PVMREQ pReqList, PVMREQ volatile *ppReqs)
1052	{
1053	STAM_COUNTER_INC(&pUVM->vm.s.StatReqMoreThan1);
1054
1055	/*
1056	* Chop off the last one (pReq).
1057	*/
1058	PVMREQ pPrev;
1059	PVMREQ pReqRet = pReqList;
1060	do
1061	{
1062	pPrev = pReqRet;
1063	pReqRet = pReqRet->pNext;
1064	} while (pReqRet->pNext);
1065	ASMAtomicWriteNullPtr(&pPrev->pNext);
1066
1067	/*
1068	* Push the others back onto the list (end of it).
1069	*/
1070	Log2(("VMR3ReqProcess: Pushing back %p %p...\n", pReqList, pReqList->pNext));
1071	if (RT_UNLIKELY(!ASMAtomicCmpXchgPtr(ppReqs, pReqList, NULL)))
1072	{
1073	STAM_COUNTER_INC(&pUVM->vm.s.StatReqPushBackRaces);
1074	do
1075	{
1076	ASMNopPause();
1077	PVMREQ pReqList2 = ASMAtomicXchgPtrT(ppReqs, NULL, PVMREQ);
1078	if (pReqList2)
1079	{
1080	PVMREQ pLast = pReqList2;
1081	while (pLast->pNext)
1082	pLast = pLast->pNext;
1083	ASMAtomicWritePtr(&pLast->pNext, pReqList);
1084	pReqList = pReqList2;
1085	}
1086	} while (!ASMAtomicCmpXchgPtr(ppReqs, pReqList, NULL));
1087	}
1088
1089	vmR3ReqSetFF(pUVM, idDstCpu);
1090	return pReqRet;
1091	}
1092
1093
1094	/**
1095	* Process pending request(s).
1096	*
1097	* This function is called from a forced action handler in the EMT
1098	* or from one of the EMT loops.
1099	*
1100	* @returns VBox status code.
1101	*
1102	* @param pUVM Pointer to the user mode VM structure.
1103	* @param idDstCpu Pass VMCPUID_ANY to process the common request queue
1104	* and the CPU ID for a CPU specific one. In the latter
1105	* case the calling thread must be the EMT of that CPU.
1106	* @param fPriorityOnly When set, only process the priority request queue.
1107	*
1108	* @note SMP safe (multiple EMTs trying to satisfy VM_FF_REQUESTs).
1109	*
1110	* @remarks This was made reentrant for async PDM handling, the debugger and
1111	* others.
1112	* @internal
1113	*/
1114	VMMR3_INT_DECL(int) VMR3ReqProcessU(PUVM pUVM, VMCPUID idDstCpu, bool fPriorityOnly)
1115	{
1116	LogFlow(("VMR3ReqProcessU: (enmVMState=%d) idDstCpu=%d\n", pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING, idDstCpu));
1117
1118	/*
1119	* Determine which queues to process.
1120	*/
1121	PVMREQ volatile *ppNormalReqs;
1122	PVMREQ volatile *ppPriorityReqs;
1123	if (idDstCpu == VMCPUID_ANY)
1124	{
1125	ppPriorityReqs = &pUVM->vm.s.pPriorityReqs;
1126	ppNormalReqs = !fPriorityOnly ? &pUVM->vm.s.pNormalReqs : ppPriorityReqs;
1127	}
1128	else
1129	{
1130	Assert(idDstCpu < pUVM->cCpus);
1131	Assert(pUVM->aCpus[idDstCpu].vm.s.NativeThreadEMT == RTThreadNativeSelf());
1132	ppPriorityReqs = &pUVM->aCpus[idDstCpu].vm.s.pPriorityReqs;
1133	ppNormalReqs = !fPriorityOnly ? &pUVM->aCpus[idDstCpu].vm.s.pNormalReqs : ppPriorityReqs;
1134	}
1135
1136	/*
1137	* Process loop.
1138	*
1139	* We do not repeat the outer loop if we've got an informational status code
1140	* since that code needs processing by our caller (usually EM).
1141	*/
1142	int rc = VINF_SUCCESS;
1143	for (;;)
1144	{
1145	/*
1146	* Get the pending requests.
1147	*
1148	* If there are more than one request, unlink the oldest and put the
1149	* rest back so that we're reentrant.
1150	*/
1151	if (RT_LIKELY(pUVM->pVM))
1152	{
1153	if (idDstCpu == VMCPUID_ANY)
1154	VM_FF_CLEAR(pUVM->pVM, VM_FF_REQUEST);
1155	else
1156	VMCPU_FF_CLEAR(pUVM->pVM->apCpusR3[idDstCpu], VMCPU_FF_REQUEST);
1157	}
1158
1159	PVMREQ pReq = ASMAtomicXchgPtrT(ppPriorityReqs, NULL, PVMREQ);
1160	if (pReq)
1161	{
1162	if (RT_UNLIKELY(pReq->pNext))
1163	pReq = vmR3ReqProcessUTooManyHelper(pUVM, idDstCpu, pReq, ppPriorityReqs);
1164	else if (ASMAtomicReadPtrT(ppNormalReqs, PVMREQ))
1165	vmR3ReqSetFF(pUVM, idDstCpu);
1166	}
1167	else
1168	{
1169	pReq = ASMAtomicXchgPtrT(ppNormalReqs, NULL, PVMREQ);
1170	if (!pReq)
1171	break;
1172	if (RT_UNLIKELY(pReq->pNext))
1173	pReq = vmR3ReqProcessUTooManyHelper(pUVM, idDstCpu, pReq, ppNormalReqs);
1174	}
1175
1176	/*
1177	* Process the request
1178	*/
1179	STAM_COUNTER_INC(&pUVM->vm.s.StatReqProcessed);
1180	int rc2 = vmR3ReqProcessOne(pReq);
1181	if ( rc2 >= VINF_EM_FIRST
1182	&& rc2 <= VINF_EM_LAST)
1183	{
1184	rc = rc2;
1185	break;
1186	}
1187	}
1188
1189	LogFlow(("VMR3ReqProcess: returns %Rrc (enmVMState=%d)\n", rc, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
1190	return rc;
1191	}
1192
1193
1194	/**
1195	* Process one request.
1196	*
1197	* @returns VBox status code.
1198	*
1199	* @param pReq Request packet to process.
1200	*/
1201	static int vmR3ReqProcessOne(PVMREQ pReq)
1202	{
1203	LogFlow(("vmR3ReqProcessOne: pReq=%p type=%d fFlags=%#x\n", pReq, pReq->enmType, pReq->fFlags));
1204
1205	/*
1206	* Process the request.
1207	*/
1208	Assert(pReq->enmState == VMREQSTATE_QUEUED);
1209	pReq->enmState = VMREQSTATE_PROCESSING;
1210	int rcRet = VINF_SUCCESS; /* the return code of this function. */
1211	int rcReq = VERR_NOT_IMPLEMENTED; /* the request status. */
1212	switch (pReq->enmType)
1213	{
1214	/*
1215	* A packed down call frame.
1216	*/
1217	case VMREQTYPE_INTERNAL:
1218	{
1219	uintptr_t *pauArgs = &pReq->u.Internal.aArgs[0];
1220	union
1221	{
1222	PFNRT pfn;
1223	DECLCALLBACKMEMBER(int, pfn00,(void));
1224	DECLCALLBACKMEMBER(int, pfn01,(uintptr_t));
1225	DECLCALLBACKMEMBER(int, pfn02,(uintptr_t, uintptr_t));
1226	DECLCALLBACKMEMBER(int, pfn03,(uintptr_t, uintptr_t, uintptr_t));
1227	DECLCALLBACKMEMBER(int, pfn04,(uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1228	DECLCALLBACKMEMBER(int, pfn05,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1229	DECLCALLBACKMEMBER(int, pfn06,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1230	DECLCALLBACKMEMBER(int, pfn07,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1231	DECLCALLBACKMEMBER(int, pfn08,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1232	DECLCALLBACKMEMBER(int, pfn09,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1233	DECLCALLBACKMEMBER(int, pfn10,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1234	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));
1235	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));
1236	DECLCALLBACKMEMBER(int, pfn13,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1237	DECLCALLBACKMEMBER(int, pfn14,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1238	DECLCALLBACKMEMBER(int, pfn15,(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t));
1239	} u;
1240	u.pfn = pReq->u.Internal.pfn;
1241	#ifndef RT_ARCH_X86
1242	switch (pReq->u.Internal.cArgs)
1243	{
1244	case 0: rcRet = u.pfn00(); break;
1245	case 1: rcRet = u.pfn01(pauArgs[0]); break;
1246	case 2: rcRet = u.pfn02(pauArgs[0], pauArgs[1]); break;
1247	case 3: rcRet = u.pfn03(pauArgs[0], pauArgs[1], pauArgs[2]); break;
1248	case 4: rcRet = u.pfn04(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3]); break;
1249	case 5: rcRet = u.pfn05(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4]); break;
1250	case 6: rcRet = u.pfn06(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5]); break;
1251	case 7: rcRet = u.pfn07(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6]); break;
1252	case 8: rcRet = u.pfn08(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7]); break;
1253	case 9: rcRet = u.pfn09(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8]); break;
1254	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;
1255	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;
1256	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;
1257	case 13: rcRet = u.pfn13(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11], pauArgs[12]); break;
1258	case 14: rcRet = u.pfn14(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11], pauArgs[12], pauArgs[13]); break;
1259	case 15: rcRet = u.pfn15(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11], pauArgs[12], pauArgs[13], pauArgs[14]); break;
1260	default:
1261	AssertReleaseMsgFailed(("cArgs=%d\n", pReq->u.Internal.cArgs));
1262	rcRet = rcReq = VERR_VM_REQUEST_TOO_MANY_ARGS_IPE;
1263	break;
1264	}
1265	#else /* x86: */
1266	size_t cbArgs = pReq->u.Internal.cArgs * sizeof(uintptr_t);
1267	# ifdef __GNUC__
1268	__asm__ __volatile__("movl %%esp, %%edx\n\t"
1269	"subl %2, %%esp\n\t"
1270	"andl $0xfffffff0, %%esp\n\t"
1271	"shrl $2, %2\n\t"
1272	"movl %%esp, %%edi\n\t"
1273	"rep movsl\n\t"
1274	"movl %%edx, %%edi\n\t"
1275	"call *%%eax\n\t"
1276	"mov %%edi, %%esp\n\t"
1277	: "=a" (rcRet),
1278	"=S" (pauArgs),
1279	"=c" (cbArgs)
1280	: "0" (u.pfn),
1281	"1" (pauArgs),
1282	"2" (cbArgs)
1283	: "edi", "edx");
1284	# else
1285	__asm
1286	{
1287	xor edx, edx /* just mess it up. */
1288	mov eax, u.pfn
1289	mov ecx, cbArgs
1290	shr ecx, 2
1291	mov esi, pauArgs
1292	mov ebx, esp
1293	sub esp, cbArgs
1294	and esp, 0xfffffff0
1295	mov edi, esp
1296	rep movsd
1297	call eax
1298	mov esp, ebx
1299	mov rcRet, eax
1300	}
1301	# endif
1302	#endif /* x86 */
1303	if ((pReq->fFlags & (VMREQFLAGS_RETURN_MASK)) == VMREQFLAGS_VOID)
1304	rcRet = VINF_SUCCESS;
1305	rcReq = rcRet;
1306	break;
1307	}
1308
1309	default:
1310	AssertMsgFailed(("pReq->enmType=%d\n", pReq->enmType));
1311	rcReq = VERR_NOT_IMPLEMENTED;
1312	break;
1313	}
1314
1315	/*
1316	* Complete the request.
1317	*/
1318	pReq->iStatus = rcReq;
1319	pReq->enmState = VMREQSTATE_COMPLETED;
1320	if (pReq->fFlags & VMREQFLAGS_NO_WAIT)
1321	{
1322	/* Free the packet, nobody is waiting. */
1323	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - freeing it\n",
1324	pReq, rcReq, rcRet));
1325	VMR3ReqFree(pReq);
1326	}
1327	else
1328	{
1329	/* Notify the waiter and him free up the packet. */
1330	LogFlow(("vmR3ReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - notifying waiting thread\n",
1331	pReq, rcReq, rcRet));
1332	ASMAtomicXchgSize(&pReq->fEventSemClear, false);
1333	int rc2 = RTSemEventSignal(pReq->EventSem);
1334	if (RT_FAILURE(rc2))
1335	{
1336	AssertRC(rc2);
1337	rcRet = rc2;
1338	}
1339	}
1340
1341	return rcRet;
1342	}
1343

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source: vbox/trunk/src/VBox/VMM/VMMR3/VMReq.cpp@ 97405

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