VMEmt.cpp@ 19621

Last change on this file since 19621 was 19539, checked in by vboxsync, 16 years ago
VMMR3YieldSuspend: only cpu 0 for now.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 39.5 KB

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1	/* $Id: VMEmt.cpp 19539 2009-05-08 18:27:38Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
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/tm.h>
28	#include <VBox/dbgf.h>
29	#include <VBox/em.h>
30	#include <VBox/pdmapi.h>
31	#include <VBox/rem.h>
32	#include <VBox/tm.h>
33	#include "VMInternal.h"
34	#include <VBox/vm.h>
35	#include <VBox/uvm.h>
36
37	#include <VBox/err.h>
38	#include <VBox/log.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41	#include <iprt/semaphore.h>
42	#include <iprt/string.h>
43	#include <iprt/thread.h>
44	#include <iprt/time.h>
45
46
47	/*******************************************************************************
48	* Internal Functions *
49	*******************************************************************************/
50	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
51
52
53	/**
54	* The emulation thread main function.
55	*
56	* @returns Thread exit code.
57	* @param ThreadSelf The handle to the executing thread.
58	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
59	*/
60	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
61	{
62	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
63	return vmR3EmulationThreadWithId(ThreadSelf, pUVCpu, pUVCpu->idCpu);
64	}
65
66
67	/**
68	* The emulation thread main function, with Virtual CPU ID for debugging.
69	*
70	* @returns Thread exit code.
71	* @param ThreadSelf The handle to the executing thread.
72	* @param pUVCpu Pointer to the user mode per-VCpu structure.
73	* @param idCpu The virtual CPU ID, for backtrace purposes.
74	*/
75	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
76	{
77	PUVM pUVM = pUVCpu->pUVM;
78	int rc;
79
80	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
81	("Invalid arguments to the emulation thread!\n"));
82
83	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
84	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
85
86	/*
87	* The request loop.
88	*/
89	rc = VINF_SUCCESS;
90	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
91	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
92	for (;;)
93	{
94	/*
95	* During early init there is no pVM, so make a special path
96	* for that to keep things clearly separate.
97	*/
98	if (!pUVM->pVM)
99	{
100	/*
101	* Check for termination first.
102	*/
103	if (pUVM->vm.s.fTerminateEMT)
104	{
105	rc = VINF_EM_TERMINATE;
106	break;
107	}
108
109	/*
110	* Only the first VCPU may initialize the VM during early init
111	* and must therefore service all VMCPUID_ANY requests.
112	* See also VMR3Create
113	*/
114	if ( pUVM->vm.s.pReqs
115	&& pUVCpu->idCpu == 0)
116	{
117	/*
118	* Service execute in any EMT request.
119	*/
120	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
121	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
122	}
123	else if (pUVCpu->vm.s.pReqs)
124	{
125	/*
126	* Service execute in specific EMT request.
127	*/
128	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
129	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
130	}
131	else
132	{
133	/*
134	* Nothing important is pending, so wait for something.
135	*/
136	rc = VMR3WaitU(pUVCpu);
137	if (RT_FAILURE(rc))
138	break;
139	}
140	}
141	else
142	{
143	/*
144	* Pending requests which needs servicing?
145	*
146	* We check for state changes in addition to status codes when
147	* servicing requests. (Look after the ifs.)
148	*/
149	PVM pVM = pUVM->pVM;
150	enmBefore = pVM->enmVMState;
151	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
152	\|\| pUVM->vm.s.fTerminateEMT)
153	{
154	rc = VINF_EM_TERMINATE;
155	break;
156	}
157	if (pUVM->vm.s.pReqs)
158	{
159	/*
160	* Service execute in any EMT request.
161	*/
162	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
163	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
164	}
165	else if (pUVCpu->vm.s.pReqs)
166	{
167	/*
168	* Service execute in specific EMT request.
169	*/
170	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
171	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pVM->enmVMState));
172	}
173	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
174	{
175	/*
176	* Service the debugger request.
177	*/
178	rc = DBGFR3VMMForcedAction(pVM);
179	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
180	}
181	else if (VM_FF_TESTANDCLEAR(pVM, VM_FF_RESET_BIT))
182	{
183	/*
184	* Service a delayed reset request.
185	*/
186	rc = VMR3Reset(pVM);
187	VM_FF_CLEAR(pVM, VM_FF_RESET);
188	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
189	}
190	else
191	{
192	/*
193	* Nothing important is pending, so wait for something.
194	*/
195	rc = VMR3WaitU(pUVCpu);
196	if (RT_FAILURE(rc))
197	break;
198	}
199
200	/*
201	* Check for termination requests, these have extremely high priority.
202	*/
203	if ( rc == VINF_EM_TERMINATE
204	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
205	\|\| pUVM->vm.s.fTerminateEMT)
206	break;
207	}
208
209	/*
210	* Some requests (both VMR3Req* and the DBGF) can potentially resume
211	* or start the VM, in that case we'll get a change in VM status
212	* indicating that we're now running.
213	*/
214	if ( RT_SUCCESS(rc)
215	&& pUVM->pVM)
216	{
217	PVM pVM = pUVM->pVM;
218	PVMCPU pVCpu = &pVM->aCpus[idCpu];
219	if ( pVM->enmVMState == VMSTATE_RUNNING
220	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
221	{
222	rc = EMR3ExecuteVM(pVM, pVCpu);
223	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
224	if ( EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION
225	&& pVM->enmVMState == VMSTATE_RUNNING)
226	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
227	}
228	}
229
230	} /* forever */
231
232
233	/*
234	* Exiting.
235	*/
236	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
237	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
238	if (pUVM->vm.s.fEMTDoesTheCleanup)
239	{
240	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
241	Assert(pUVM->pVM);
242	vmR3Destroy(pUVM->pVM);
243	vmR3DestroyFinalBitFromEMT(pUVM);
244	}
245	else
246	{
247	vmR3DestroyFinalBitFromEMT(pUVM);
248
249	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
250	}
251	Log(("vmR3EmulationThread: EMT is terminated.\n"));
252	return rc;
253	}
254
255
256	/**
257	* Gets the name of a halt method.
258	*
259	* @returns Pointer to a read only string.
260	* @param enmMethod The method.
261	*/
262	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
263	{
264	switch (enmMethod)
265	{
266	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
267	case VMHALTMETHOD_DEFAULT: return "default";
268	case VMHALTMETHOD_OLD: return "old";
269	case VMHALTMETHOD_1: return "method1";
270	//case VMHALTMETHOD_2: return "method2";
271	case VMHALTMETHOD_GLOBAL_1: return "global1";
272	default: return "unknown";
273	}
274	}
275
276
277	/**
278	* The old halt loop.
279	*/
280	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
281	{
282	/*
283	* Halt loop.
284	*/
285	PVM pVM = pUVCpu->pVM;
286	PVMCPU pVCpu = pUVCpu->pVCpu;
287
288	int rc = VINF_SUCCESS;
289	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
290	//unsigned cLoops = 0;
291	for (;;)
292	{
293	/*
294	* Work the timers and check if we can exit.
295	* The poll call gives us the ticks left to the next event in
296	* addition to perhaps set an FF.
297	*/
298	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
299	TMR3TimerQueuesDo(pVM);
300	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
301	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
302	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
303	break;
304	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
305	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
306	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
307	break;
308
309	/*
310	* Wait for a while. Someone will wake us up or interrupt the call if
311	* anything needs our attention.
312	*/
313	if (u64NanoTS < 50000)
314	{
315	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
316	/* spin */;
317	}
318	else
319	{
320	VMMR3YieldStop(pVM);
321	//uint64_t u64Start = RTTimeNanoTS();
322	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
323	{
324	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
325	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
326	RTThreadYield(); /* this is the best we can do here */
327	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
328	}
329	else if (u64NanoTS < 2000000)
330	{
331	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
332	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
333	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
334	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
335	}
336	else
337	{
338	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
339	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
340	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
341	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
342	}
343	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
344	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
345	}
346	if (rc == VERR_TIMEOUT)
347	rc = VINF_SUCCESS;
348	else if (RT_FAILURE(rc))
349	{
350	AssertRC(rc != VERR_INTERRUPTED);
351	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
352	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
353	VM_FF_SET(pVM, VM_FF_TERMINATE);
354	rc = VERR_INTERNAL_ERROR;
355	break;
356	}
357	}
358
359	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
360	return rc;
361	}
362
363
364	/**
365	* Initialize the configuration of halt method 1 & 2.
366	*
367	* @return VBox status code. Failure on invalid CFGM data.
368	* @param pVM The VM handle.
369	*/
370	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
371	{
372	/*
373	* The defaults.
374	*/
375	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
376	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
377	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
378	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
379	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
380	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
381	#else
382	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
383	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
384	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
385	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
386	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
387	#endif
388
389	/*
390	* Query overrides.
391	*
392	* I don't have time to bother with niceities such as invalid value checks
393	* here right now. sorry.
394	*/
395	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
396	if (pCfg)
397	{
398	uint32_t u32;
399	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
400	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
401	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
402	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
403	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
404	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
405	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
406	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
407	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
408	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
409	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
410	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
411	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
412	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
413	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
414	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
415	}
416
417	return VINF_SUCCESS;
418	}
419
420
421	/**
422	* Initialize halt method 1.
423	*
424	* @return VBox status code.
425	* @param pUVM Pointer to the user mode VM structure.
426	*/
427	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
428	{
429	return vmR3HaltMethod12ReadConfigU(pUVM);
430	}
431
432
433	/**
434	* Method 1 - Block whenever possible, and when lagging behind
435	* switch to spinning for 10-30ms with occational blocking until
436	* the lag has been eliminated.
437	*/
438	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
439	{
440	PUVM pUVM = pUVCpu->pUVM;
441	PVMCPU pVCpu = pUVCpu->pVCpu;
442	PVM pVM = pUVCpu->pVM;
443
444	/*
445	* To simplify things, we decide up-front whether we should switch to spinning or
446	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
447	* and that it will generate interrupts or other events that will cause us to exit
448	* the halt loop.
449	*/
450	bool fBlockOnce = false;
451	bool fSpinning = false;
452	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
453	if (u32CatchUpPct /* non-zero if catching up */)
454	{
455	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
456	{
457	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
458	if (fSpinning)
459	{
460	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
461	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
462	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
463	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
464	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
465	}
466	else
467	{
468	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
469	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
470	}
471	}
472	else
473	{
474	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
475	if (fSpinning)
476	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
477	}
478	}
479	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
480	{
481	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
482	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
483	}
484
485	/*
486	* Halt loop.
487	*/
488	int rc = VINF_SUCCESS;
489	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
490	unsigned cLoops = 0;
491	for (;; cLoops++)
492	{
493	/*
494	* Work the timers and check if we can exit.
495	*/
496	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
497	TMR3TimerQueuesDo(pVM);
498	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
499	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
500	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
501	break;
502
503	/*
504	* Estimate time left to the next event.
505	*/
506	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
507	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
508	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
509	break;
510
511	/*
512	* Block if we're not spinning and the interval isn't all that small.
513	*/
514	if ( ( !fSpinning
515	\|\| fBlockOnce)
516	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
517	&& u64NanoTS >= 100000) /* 0.100 ms */
518	#else
519	&& u64NanoTS >= 250000) /* 0.250 ms */
520	#endif
521	{
522	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
523	VMMR3YieldStop(pVM);
524
525	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
526	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
527	cMilliSecs = 1;
528	else
529	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
530	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
531	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
532	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
533	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
534	if (rc == VERR_TIMEOUT)
535	rc = VINF_SUCCESS;
536	else if (RT_FAILURE(rc))
537	{
538	AssertRC(rc != VERR_INTERRUPTED);
539	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
540	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
541	VM_FF_SET(pVM, VM_FF_TERMINATE);
542	rc = VERR_INTERNAL_ERROR;
543	break;
544	}
545
546	/*
547	* Calc the statistics.
548	* Update averages every 16th time, and flush parts of the history every 64th time.
549	*/
550	const uint64_t Elapsed = RTTimeNanoTS() - Start;
551	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
552	if (Elapsed > u64NanoTS)
553	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
554	pUVCpu->vm.s.Halt.Method12.cBlocks++;
555	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
556	{
557	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
558	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
559	{
560	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
561	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
562	}
563	}
564	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
565
566	/*
567	* Clear the block once flag if we actually blocked.
568	*/
569	if ( fBlockOnce
570	&& Elapsed > 100000 /* 0.1 ms */)
571	fBlockOnce = false;
572	}
573	}
574	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
575
576	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
577	return rc;
578	}
579
580
581	/**
582	* Initialize the global 1 halt method.
583	*
584	* @return VBox status code.
585	* @param pUVM Pointer to the user mode VM structure.
586	*/
587	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
588	{
589	return VINF_SUCCESS;
590	}
591
592
593	/**
594	* The global 1 halt method - Block in GMM (ring-0) and let it
595	* try take care of the global scheduling of EMT threads.
596	*/
597	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
598	{
599	PUVM pUVM = pUVCpu->pUVM;
600	PVMCPU pVCpu = pUVCpu->pVCpu;
601	PVM pVM = pUVCpu->pVM;
602	Assert(VMMGetCpu(pVM) == pVCpu);
603
604	/*
605	* Halt loop.
606	*/
607	int rc = VINF_SUCCESS;
608	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
609	unsigned cLoops = 0;
610	for (;; cLoops++)
611	{
612	/*
613	* Work the timers and check if we can exit.
614	*/
615	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
616	TMR3TimerQueuesDo(pVM);
617	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
618	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
619	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
620	break;
621
622	/*
623	* Estimate time left to the next event.
624	*/
625	uint64_t u64Delta;
626	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
627	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
628	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
629	break;
630
631	/*
632	* Block if we're not spinning and the interval isn't all that small.
633	*/
634	if (u64Delta > 50000 /* 0.050ms */)
635	{
636	VMMR3YieldStop(pVM);
637	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
638	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
639	break;
640
641	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
642	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
643	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
644	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
645	if (rc == VERR_INTERRUPTED)
646	rc = VINF_SUCCESS;
647	else if (RT_FAILURE(rc))
648	{
649	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc));
650	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
651	VM_FF_SET(pVM, VM_FF_TERMINATE);
652	rc = VERR_INTERNAL_ERROR;
653	break;
654	}
655	}
656	/*
657	* When spinning call upon the GVMM and do some wakups once
658	* in a while, it's not like we're actually busy or anything.
659	*/
660	else if (!(cLoops & 0x1fff))
661	{
662	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
663	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
664	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
665	}
666	}
667	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
668
669	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
670	return rc;
671	}
672
673
674	/**
675	* The global 1 halt method - VMR3Wait() worker.
676	*
677	* @returns VBox status code.
678	* @param pUVCpu Pointer to the user mode VMCPU structure.
679	*/
680	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
681	{
682	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
683
684	PVM pVM = pUVCpu->pUVM->pVM;
685	PVMCPU pVCpu = VMMGetCpu(pVM);
686	Assert(pVCpu->idCpu == pUVCpu->idCpu);
687
688	int rc = VINF_SUCCESS;
689	for (;;)
690	{
691	/*
692	* Check Relevant FFs.
693	*/
694	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
695	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
696	break;
697
698	/*
699	* Wait for a while. Someone will wake us up or interrupt the call if
700	* anything needs our attention.
701	*/
702	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
703	if (rc == VERR_INTERRUPTED)
704	rc = VINF_SUCCESS;
705	else if (RT_FAILURE(rc))
706	{
707	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
708	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
709	VM_FF_SET(pVM, VM_FF_TERMINATE);
710	rc = VERR_INTERNAL_ERROR;
711	break;
712	}
713
714	}
715
716	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
717	return rc;
718	}
719
720
721	/**
722	* The global 1 halt method - VMR3NotifyFF() worker.
723	*
724	* @param pUVCpu Pointer to the user mode VMCPU structure.
725	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
726	*/
727	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
728	{
729	if (pUVCpu->vm.s.fWait)
730	{
731	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
732	AssertRC(rc);
733	}
734	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
735	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
736	&& pUVCpu->pVCpu)
737	{
738	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
739	if (enmState == VMCPUSTATE_STARTED_EXEC)
740	{
741	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
742	{
743	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
744	AssertRC(rc);
745	}
746	}
747	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
748	{
749	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
750	REMR3NotifyFF(pUVCpu->pVM);
751	}
752	}
753	}
754
755
756	/**
757	* Bootstrap VMR3Wait() worker.
758	*
759	* @returns VBox status code.
760	* @param pUVMCPU Pointer to the user mode VMCPU structure.
761	*/
762	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
763	{
764	PUVM pUVM = pUVCpu->pUVM;
765
766	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
767
768	int rc = VINF_SUCCESS;
769	for (;;)
770	{
771	/*
772	* Check Relevant FFs.
773	*/
774	if (pUVM->vm.s.pReqs) /* global requests pending? */
775	break;
776	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
777	break;
778
779	if ( pUVCpu->pVM
780	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
781	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
782	)
783	)
784	break;
785	if (pUVCpu->vm.s.fTerminateEMT)
786	break;
787
788	/*
789	* Wait for a while. Someone will wake us up or interrupt the call if
790	* anything needs our attention.
791	*/
792	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
793	if (rc == VERR_TIMEOUT)
794	rc = VINF_SUCCESS;
795	else if (RT_FAILURE(rc))
796	{
797	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
798	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
799	if (pUVCpu->pVM)
800	VM_FF_SET(pUVCpu->pVM, VM_FF_TERMINATE);
801	rc = VERR_INTERNAL_ERROR;
802	break;
803	}
804
805	}
806
807	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
808	return rc;
809	}
810
811
812	/**
813	* Bootstrap VMR3NotifyFF() worker.
814	*
815	* @param pUVCpu Pointer to the user mode VMCPU structure.
816	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
817	*/
818	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
819	{
820	if (pUVCpu->vm.s.fWait)
821	{
822	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
823	AssertRC(rc);
824	}
825	NOREF(fFlags);
826	}
827
828
829	/**
830	* Default VMR3Wait() worker.
831	*
832	* @returns VBox status code.
833	* @param pUVMCPU Pointer to the user mode VMCPU structure.
834	*/
835	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
836	{
837	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
838
839	PVM pVM = pUVCpu->pVM;
840	PVMCPU pVCpu = pUVCpu->pVCpu;
841	int rc = VINF_SUCCESS;
842	for (;;)
843	{
844	/*
845	* Check Relevant FFs.
846	*/
847	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
848	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
849	break;
850
851	/*
852	* Wait for a while. Someone will wake us up or interrupt the call if
853	* anything needs our attention.
854	*/
855	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
856	if (rc == VERR_TIMEOUT)
857	rc = VINF_SUCCESS;
858	else if (RT_FAILURE(rc))
859	{
860	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
861	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
862	VM_FF_SET(pVM, VM_FF_TERMINATE);
863	rc = VERR_INTERNAL_ERROR;
864	break;
865	}
866
867	}
868
869	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
870	return rc;
871	}
872
873
874	/**
875	* Default VMR3NotifyFF() worker.
876	*
877	* @param pUVCpu Pointer to the user mode VMCPU structure.
878	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
879	*/
880	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
881	{
882	if (pUVCpu->vm.s.fWait)
883	{
884	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
885	AssertRC(rc);
886	}
887	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
888	&& pUVCpu->pVCpu
889	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
890	REMR3NotifyFF(pUVCpu->pVM);
891	}
892
893
894	/**
895	* Array with halt method descriptors.
896	* VMINT::iHaltMethod contains an index into this array.
897	*/
898	static const struct VMHALTMETHODDESC
899	{
900	/** The halt method id. */
901	VMHALTMETHOD enmHaltMethod;
902	/** The init function for loading config and initialize variables. */
903	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
904	/** The term function. */
905	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
906	/** The VMR3WaitHaltedU function. */
907	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
908	/** The VMR3WaitU function. */
909	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
910	/** The VMR3NotifyCpuFFU function. */
911	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
912	/** The VMR3NotifyGlobalFFU function. */
913	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
914	} g_aHaltMethods[] =
915	{
916	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
917	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
918	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
919	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
920	};
921
922
923	/**
924	* Notify the emulation thread (EMT) about pending Forced Action (FF).
925	*
926	* This function is called by thread other than EMT to make
927	* sure EMT wakes up and promptly service an FF request.
928	*
929	* @param pUVM Pointer to the user mode VM structure.
930	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
931	*/
932	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
933	{
934	LogFlow(("VMR3NotifyGlobalFFU:\n"));
935	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
936
937	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
938	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
939	else
940	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
941	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
942	}
943
944
945	/**
946	* Notify the emulation thread (EMT) about pending Forced Action (FF).
947	*
948	* This function is called by thread other than EMT to make
949	* sure EMT wakes up and promptly service an FF request.
950	*
951	* @param pUVM Pointer to the user mode VM structure.
952	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
953	*/
954	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
955	{
956	PUVM pUVM = pUVCpu->pUVM;
957
958	LogFlow(("VMR3NotifyCpuFFU:\n"));
959	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
960	}
961
962
963	/**
964	* Halted VM Wait.
965	* Any external event will unblock the thread.
966	*
967	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
968	* case an appropriate status code is returned.
969	* @param pVM VM handle.
970	* @param pVCpu VMCPU handle.
971	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
972	* @thread The emulation thread.
973	*/
974	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
975	{
976	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
977
978	/*
979	* Check Relevant FFs.
980	*/
981	const uint32_t fMask = !fIgnoreInterrupts
982	? VMCPU_FF_EXTERNAL_HALTED_MASK
983	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
984	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
985	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
986	{
987	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
988	return VINF_SUCCESS;
989	}
990
991	/*
992	* The yielder is suspended while we're halting, while TM might have clock(s) running
993	* only at certain times and need to be notified..
994	*/
995	if (pVCpu->idCpu == 0)
996	VMMR3YieldSuspend(pVM);
997	TMNotifyStartOfHalt(pVCpu);
998
999	/*
1000	* Record halt averages for the last second.
1001	*/
1002	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1003	uint64_t u64Now = RTTimeNanoTS();
1004	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1005	if (off > 1000000000)
1006	{
1007	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1008	{
1009	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1010	pUVCpu->vm.s.HaltFrequency = 1;
1011	}
1012	else
1013	{
1014	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1015	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1016	}
1017	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1018	pUVCpu->vm.s.cHalts = 0;
1019	}
1020	pUVCpu->vm.s.cHalts++;
1021
1022	/*
1023	* Do the halt.
1024	*/
1025	Assert(VMCPU_GET_STATE(pVCpu) == VMCPUSTATE_STARTED);
1026	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1027	PUVM pUVM = pUVCpu->pUVM;
1028	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1029	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1030
1031	/*
1032	* Notify TM and resume the yielder
1033	*/
1034	TMNotifyEndOfHalt(pVCpu);
1035	if (pVCpu->idCpu == 0)
1036	VMMR3YieldResume(pVM);
1037
1038	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1039	return rc;
1040	}
1041
1042
1043	/**
1044	* Suspended VM Wait.
1045	* Only a handful of forced actions will cause the function to
1046	* return to the caller.
1047	*
1048	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1049	* case an appropriate status code is returned.
1050	* @param pUVCpu Pointer to the user mode VMCPU structure.
1051	* @thread The emulation thread.
1052	*/
1053	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1054	{
1055	LogFlow(("VMR3WaitU:\n"));
1056
1057	/*
1058	* Check Relevant FFs.
1059	*/
1060	PVM pVM = pUVCpu->pVM;
1061	PVMCPU pVCpu = pUVCpu->pVCpu;
1062
1063	if ( pVM
1064	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1065	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1066	)
1067	)
1068	{
1069	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1070	return VINF_SUCCESS;
1071	}
1072
1073	/*
1074	* Do waiting according to the halt method (so VMR3NotifyFF
1075	* doesn't have to special case anything).
1076	*/
1077	PUVM pUVM = pUVCpu->pUVM;
1078	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1079	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 0));
1080	return rc;
1081	}
1082
1083
1084	/**
1085	* Changes the halt method.
1086	*
1087	* @returns VBox status code.
1088	* @param pUVM Pointer to the user mode VM structure.
1089	* @param enmHaltMethod The new halt method.
1090	* @thread EMT.
1091	*/
1092	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1093	{
1094	PVM pVM = pUVM->pVM; Assert(pVM);
1095	VM_ASSERT_EMT(pVM);
1096	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1097
1098	/*
1099	* Resolve default (can be overridden in the configuration).
1100	*/
1101	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1102	{
1103	uint32_t u32;
1104	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1105	if (RT_SUCCESS(rc))
1106	{
1107	enmHaltMethod = (VMHALTMETHOD)u32;
1108	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1109	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1110	}
1111	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1112	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1113	else
1114	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1115	//enmHaltMethod = VMHALTMETHOD_1;
1116	//enmHaltMethod = VMHALTMETHOD_OLD;
1117	}
1118	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1119
1120	/*
1121	* Find the descriptor.
1122	*/
1123	unsigned i = 0;
1124	while ( i < RT_ELEMENTS(g_aHaltMethods)
1125	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1126	i++;
1127	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1128
1129	/*
1130	* Terminate the old one.
1131	*/
1132	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1133	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1134	{
1135	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1136	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1137	}
1138
1139	/** @todo SMP: Need rendezvous thing here, the other EMTs must not be
1140	* sleeping when we switch the notification method or we'll never
1141	* manage to wake them up properly and end up relying on timeouts... */
1142
1143	/*
1144	* Init the new one.
1145	*/
1146	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1147	if (g_aHaltMethods[i].pfnInit)
1148	{
1149	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1150	AssertRCReturn(rc, rc);
1151	}
1152	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1153
1154	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1155	return VINF_SUCCESS;
1156	}
1157

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 19621

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