VMEmt.cpp@ 24442

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1	/* $Id: VMEmt.cpp 23190 2009-09-21 14:18:30Z 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 %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "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 %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "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	{
139	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
140	break;
141	}
142	}
143	}
144	else
145	{
146	/*
147	* Pending requests which needs servicing?
148	*
149	* We check for state changes in addition to status codes when
150	* servicing requests. (Look after the ifs.)
151	*/
152	PVM pVM = pUVM->pVM;
153	enmBefore = pVM->enmVMState;
154	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
155	\|\| pUVM->vm.s.fTerminateEMT)
156	{
157	rc = VINF_EM_TERMINATE;
158	break;
159	}
160
161	if (VM_FF_ISPENDING(pVM, VM_FF_EMT_RENDEZVOUS))
162	{
163	rc = VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
164	Log(("vmR3EmulationThread: Rendezvous rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
165	}
166	else if (pUVM->vm.s.pReqs)
167	{
168	/*
169	* Service execute in any EMT request.
170	*/
171	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
172	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
173	}
174	else if (pUVCpu->vm.s.pReqs)
175	{
176	/*
177	* Service execute in specific EMT request.
178	*/
179	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
180	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
181	}
182	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
183	{
184	/*
185	* Service the debugger request.
186	*/
187	rc = DBGFR3VMMForcedAction(pVM);
188	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
189	}
190	else if (VM_FF_TESTANDCLEAR(pVM, VM_FF_RESET))
191	{
192	/*
193	* Service a delayed reset request.
194	*/
195	rc = VMR3Reset(pVM);
196	VM_FF_CLEAR(pVM, VM_FF_RESET);
197	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
198	}
199	else
200	{
201	/*
202	* Nothing important is pending, so wait for something.
203	*/
204	rc = VMR3WaitU(pUVCpu);
205	if (RT_FAILURE(rc))
206	{
207	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
208	break;
209	}
210	}
211
212	/*
213	* Check for termination requests, these have extremely high priority.
214	*/
215	if ( rc == VINF_EM_TERMINATE
216	\|\| pUVM->vm.s.fTerminateEMT
217	\|\| ( pUVM->pVM /* pVM may have become invalid by now. */
218	&& VM_FF_ISSET(pUVM->pVM, VM_FF_TERMINATE)))
219	break;
220	}
221
222	/*
223	* Some requests (both VMR3Req* and the DBGF) can potentially resume
224	* or start the VM, in that case we'll get a change in VM status
225	* indicating that we're now running.
226	*/
227	if ( RT_SUCCESS(rc)
228	&& pUVM->pVM)
229	{
230	PVM pVM = pUVM->pVM;
231	PVMCPU pVCpu = &pVM->aCpus[idCpu];
232	if ( pVM->enmVMState == VMSTATE_RUNNING
233	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
234	{
235	rc = EMR3ExecuteVM(pVM, pVCpu);
236	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
237	if (EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION)
238	vmR3SetGuruMeditation(pVM);
239	}
240	}
241
242	} /* forever */
243
244
245	/*
246	* Cleanup and exit.
247	* If EMT(0) called VMR3Destroy, EMT(0) will do all the terminating here.
248	*/
249	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
250	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
251	if ( pUVM->vm.s.fEMTDoesTheCleanup
252	&& idCpu == 0)
253	{
254	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
255	Assert(pUVM->pVM);
256	vmR3Destroy(pUVM->pVM);
257	vmR3DestroyFinalBitFromEMT(pUVM, idCpu);
258	/* The pUVM structure is now invliad. */
259	pUVCpu = NULL;
260	pUVM = NULL;
261	}
262	else
263	{
264	vmR3DestroyFinalBitFromEMT(pUVM, idCpu);
265	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
266	}
267	Log(("vmR3EmulationThread: EMT is terminated.\n"));
268	return rc;
269	}
270
271
272	/**
273	* Gets the name of a halt method.
274	*
275	* @returns Pointer to a read only string.
276	* @param enmMethod The method.
277	*/
278	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
279	{
280	switch (enmMethod)
281	{
282	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
283	case VMHALTMETHOD_DEFAULT: return "default";
284	case VMHALTMETHOD_OLD: return "old";
285	case VMHALTMETHOD_1: return "method1";
286	//case VMHALTMETHOD_2: return "method2";
287	case VMHALTMETHOD_GLOBAL_1: return "global1";
288	default: return "unknown";
289	}
290	}
291
292
293	/**
294	* The old halt loop.
295	*/
296	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
297	{
298	/*
299	* Halt loop.
300	*/
301	PVM pVM = pUVCpu->pVM;
302	PVMCPU pVCpu = pUVCpu->pVCpu;
303
304	int rc = VINF_SUCCESS;
305	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
306	//unsigned cLoops = 0;
307	for (;;)
308	{
309	/*
310	* Work the timers and check if we can exit.
311	* The poll call gives us the ticks left to the next event in
312	* addition to perhaps set an FF.
313	*/
314	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
315	TMR3TimerQueuesDo(pVM);
316	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
317	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
318	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
319	break;
320	uint64_t u64NanoTS;
321	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
322	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
323	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
324	break;
325
326	/*
327	* Wait for a while. Someone will wake us up or interrupt the call if
328	* anything needs our attention.
329	*/
330	if (u64NanoTS < 50000)
331	{
332	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
333	/* spin */;
334	}
335	else
336	{
337	VMMR3YieldStop(pVM);
338	//uint64_t u64Start = RTTimeNanoTS();
339	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
340	{
341	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
342	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
343	RTThreadYield(); /* this is the best we can do here */
344	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
345	}
346	else if (u64NanoTS < 2000000)
347	{
348	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
349	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
350	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
351	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
352	}
353	else
354	{
355	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
356	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
357	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
358	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
359	}
360	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
361	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
362	}
363	if (rc == VERR_TIMEOUT)
364	rc = VINF_SUCCESS;
365	else if (RT_FAILURE(rc))
366	{
367	AssertRC(rc != VERR_INTERRUPTED);
368	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
369	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
370	VM_FF_SET(pVM, VM_FF_TERMINATE);
371	rc = VERR_INTERNAL_ERROR;
372	break;
373	}
374	}
375
376	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
377	return rc;
378	}
379
380
381	/**
382	* Initialize the configuration of halt method 1 & 2.
383	*
384	* @return VBox status code. Failure on invalid CFGM data.
385	* @param pVM The VM handle.
386	*/
387	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
388	{
389	/*
390	* The defaults.
391	*/
392	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
393	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
394	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
395	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
396	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
397	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
398	#else
399	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
400	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
401	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
402	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
403	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
404	#endif
405
406	/*
407	* Query overrides.
408	*
409	* I don't have time to bother with niceities such as invalid value checks
410	* here right now. sorry.
411	*/
412	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
413	if (pCfg)
414	{
415	uint32_t u32;
416	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
417	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
418	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
419	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
420	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
421	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
422	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
423	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
424	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
425	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
426	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
427	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
428	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
429	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
430	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
431	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
432	}
433
434	return VINF_SUCCESS;
435	}
436
437
438	/**
439	* Initialize halt method 1.
440	*
441	* @return VBox status code.
442	* @param pUVM Pointer to the user mode VM structure.
443	*/
444	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
445	{
446	return vmR3HaltMethod12ReadConfigU(pUVM);
447	}
448
449
450	/**
451	* Method 1 - Block whenever possible, and when lagging behind
452	* switch to spinning for 10-30ms with occational blocking until
453	* the lag has been eliminated.
454	*/
455	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
456	{
457	PUVM pUVM = pUVCpu->pUVM;
458	PVMCPU pVCpu = pUVCpu->pVCpu;
459	PVM pVM = pUVCpu->pVM;
460
461	/*
462	* To simplify things, we decide up-front whether we should switch to spinning or
463	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
464	* and that it will generate interrupts or other events that will cause us to exit
465	* the halt loop.
466	*/
467	bool fBlockOnce = false;
468	bool fSpinning = false;
469	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
470	if (u32CatchUpPct /* non-zero if catching up */)
471	{
472	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
473	{
474	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
475	if (fSpinning)
476	{
477	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
478	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
479	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
480	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
481	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
482	}
483	else
484	{
485	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
486	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
487	}
488	}
489	else
490	{
491	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
492	if (fSpinning)
493	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
494	}
495	}
496	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
497	{
498	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
499	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
500	}
501
502	/*
503	* Halt loop.
504	*/
505	int rc = VINF_SUCCESS;
506	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
507	unsigned cLoops = 0;
508	for (;; cLoops++)
509	{
510	/*
511	* Work the timers and check if we can exit.
512	*/
513	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
514	TMR3TimerQueuesDo(pVM);
515	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
516	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
517	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
518	break;
519
520	/*
521	* Estimate time left to the next event.
522	*/
523	uint64_t u64NanoTS;
524	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
525	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
526	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
527	break;
528
529	/*
530	* Block if we're not spinning and the interval isn't all that small.
531	*/
532	if ( ( !fSpinning
533	\|\| fBlockOnce)
534	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
535	&& u64NanoTS >= 100000) /* 0.100 ms */
536	#else
537	&& u64NanoTS >= 250000) /* 0.250 ms */
538	#endif
539	{
540	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
541	VMMR3YieldStop(pVM);
542
543	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
544	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
545	cMilliSecs = 1;
546	else
547	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
548	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
549	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
550	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
551	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
552	if (rc == VERR_TIMEOUT)
553	rc = VINF_SUCCESS;
554	else if (RT_FAILURE(rc))
555	{
556	AssertRC(rc != VERR_INTERRUPTED);
557	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
558	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
559	VM_FF_SET(pVM, VM_FF_TERMINATE);
560	rc = VERR_INTERNAL_ERROR;
561	break;
562	}
563
564	/*
565	* Calc the statistics.
566	* Update averages every 16th time, and flush parts of the history every 64th time.
567	*/
568	const uint64_t Elapsed = RTTimeNanoTS() - Start;
569	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
570	if (Elapsed > u64NanoTS)
571	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
572	pUVCpu->vm.s.Halt.Method12.cBlocks++;
573	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
574	{
575	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
576	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
577	{
578	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
579	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
580	}
581	}
582	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
583
584	/*
585	* Clear the block once flag if we actually blocked.
586	*/
587	if ( fBlockOnce
588	&& Elapsed > 100000 /* 0.1 ms */)
589	fBlockOnce = false;
590	}
591	}
592	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
593
594	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
595	return rc;
596	}
597
598
599	/**
600	* Initialize the global 1 halt method.
601	*
602	* @return VBox status code.
603	* @param pUVM Pointer to the user mode VM structure.
604	*/
605	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
606	{
607	return VINF_SUCCESS;
608	}
609
610
611	/**
612	* The global 1 halt method - Block in GMM (ring-0) and let it
613	* try take care of the global scheduling of EMT threads.
614	*/
615	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
616	{
617	PUVM pUVM = pUVCpu->pUVM;
618	PVMCPU pVCpu = pUVCpu->pVCpu;
619	PVM pVM = pUVCpu->pVM;
620	Assert(VMMGetCpu(pVM) == pVCpu);
621
622	/*
623	* Halt loop.
624	*/
625	int rc = VINF_SUCCESS;
626	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
627	unsigned cLoops = 0;
628	for (;; cLoops++)
629	{
630	/*
631	* Work the timers and check if we can exit.
632	*/
633	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
634	TMR3TimerQueuesDo(pVM);
635	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
636	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
637	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
638	break;
639
640	/*
641	* Estimate time left to the next event.
642	*/
643	uint64_t u64Delta;
644	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
645	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
646	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
647	break;
648
649	/*
650	* Block if we're not spinning and the interval isn't all that small.
651	*/
652	if (u64Delta > 50000 /* 0.050ms */)
653	{
654	VMMR3YieldStop(pVM);
655	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
656	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
657	break;
658
659	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
660	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
661	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
662	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
663	if (rc == VERR_INTERRUPTED)
664	rc = VINF_SUCCESS;
665	else if (RT_FAILURE(rc))
666	{
667	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc));
668	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
669	VM_FF_SET(pVM, VM_FF_TERMINATE);
670	rc = VERR_INTERNAL_ERROR;
671	break;
672	}
673	}
674	/*
675	* When spinning call upon the GVMM and do some wakups once
676	* in a while, it's not like we're actually busy or anything.
677	*/
678	else if (!(cLoops & 0x1fff))
679	{
680	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
681	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
682	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
683	}
684	}
685	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
686
687	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
688	return rc;
689	}
690
691
692	/**
693	* The global 1 halt method - VMR3Wait() worker.
694	*
695	* @returns VBox status code.
696	* @param pUVCpu Pointer to the user mode VMCPU structure.
697	*/
698	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
699	{
700	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
701
702	PVM pVM = pUVCpu->pUVM->pVM;
703	PVMCPU pVCpu = VMMGetCpu(pVM);
704	Assert(pVCpu->idCpu == pUVCpu->idCpu);
705
706	int rc = VINF_SUCCESS;
707	for (;;)
708	{
709	/*
710	* Check Relevant FFs.
711	*/
712	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
713	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
714	break;
715
716	/*
717	* Wait for a while. Someone will wake us up or interrupt the call if
718	* anything needs our attention.
719	*/
720	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
721	if (rc == VERR_INTERRUPTED)
722	rc = VINF_SUCCESS;
723	else if (RT_FAILURE(rc))
724	{
725	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
726	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
727	VM_FF_SET(pVM, VM_FF_TERMINATE);
728	rc = VERR_INTERNAL_ERROR;
729	break;
730	}
731
732	}
733
734	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
735	return rc;
736	}
737
738
739	/**
740	* The global 1 halt method - VMR3NotifyFF() worker.
741	*
742	* @param pUVCpu Pointer to the user mode VMCPU structure.
743	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
744	*/
745	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
746	{
747	if (pUVCpu->vm.s.fWait)
748	{
749	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
750	AssertRC(rc);
751	}
752	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
753	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
754	&& pUVCpu->pVCpu)
755	{
756	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
757	if (enmState == VMCPUSTATE_STARTED_EXEC)
758	{
759	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
760	{
761	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
762	AssertRC(rc);
763	}
764	}
765	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
766	{
767	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
768	REMR3NotifyFF(pUVCpu->pVM);
769	}
770	}
771	}
772
773
774	/**
775	* Bootstrap VMR3Wait() worker.
776	*
777	* @returns VBox status code.
778	* @param pUVMCPU Pointer to the user mode VMCPU structure.
779	*/
780	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
781	{
782	PUVM pUVM = pUVCpu->pUVM;
783
784	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
785
786	int rc = VINF_SUCCESS;
787	for (;;)
788	{
789	/*
790	* Check Relevant FFs.
791	*/
792	if (pUVM->vm.s.pReqs) /* global requests pending? */
793	break;
794	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
795	break;
796
797	if ( pUVCpu->pVM
798	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
799	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
800	)
801	)
802	break;
803	if (pUVCpu->vm.s.fTerminateEMT)
804	break;
805
806	/*
807	* Wait for a while. Someone will wake us up or interrupt the call if
808	* anything needs our attention.
809	*/
810	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
811	if (rc == VERR_TIMEOUT)
812	rc = VINF_SUCCESS;
813	else if (RT_FAILURE(rc))
814	{
815	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
816	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
817	if (pUVCpu->pVM)
818	VM_FF_SET(pUVCpu->pVM, VM_FF_TERMINATE);
819	rc = VERR_INTERNAL_ERROR;
820	break;
821	}
822
823	}
824
825	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
826	return rc;
827	}
828
829
830	/**
831	* Bootstrap VMR3NotifyFF() worker.
832	*
833	* @param pUVCpu Pointer to the user mode VMCPU structure.
834	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
835	*/
836	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
837	{
838	if (pUVCpu->vm.s.fWait)
839	{
840	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
841	AssertRC(rc);
842	}
843	NOREF(fFlags);
844	}
845
846
847	/**
848	* Default VMR3Wait() worker.
849	*
850	* @returns VBox status code.
851	* @param pUVMCPU Pointer to the user mode VMCPU structure.
852	*/
853	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
854	{
855	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
856
857	PVM pVM = pUVCpu->pVM;
858	PVMCPU pVCpu = pUVCpu->pVCpu;
859	int rc = VINF_SUCCESS;
860	for (;;)
861	{
862	/*
863	* Check Relevant FFs.
864	*/
865	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
866	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
867	break;
868
869	/*
870	* Wait for a while. Someone will wake us up or interrupt the call if
871	* anything needs our attention.
872	*/
873	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
874	if (rc == VERR_TIMEOUT)
875	rc = VINF_SUCCESS;
876	else if (RT_FAILURE(rc))
877	{
878	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
879	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
880	VM_FF_SET(pVM, VM_FF_TERMINATE);
881	rc = VERR_INTERNAL_ERROR;
882	break;
883	}
884
885	}
886
887	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
888	return rc;
889	}
890
891
892	/**
893	* Default VMR3NotifyFF() worker.
894	*
895	* @param pUVCpu Pointer to the user mode VMCPU structure.
896	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
897	*/
898	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
899	{
900	if (pUVCpu->vm.s.fWait)
901	{
902	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
903	AssertRC(rc);
904	}
905	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
906	&& pUVCpu->pVCpu
907	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
908	REMR3NotifyFF(pUVCpu->pVM);
909	}
910
911
912	/**
913	* Array with halt method descriptors.
914	* VMINT::iHaltMethod contains an index into this array.
915	*/
916	static const struct VMHALTMETHODDESC
917	{
918	/** The halt method id. */
919	VMHALTMETHOD enmHaltMethod;
920	/** The init function for loading config and initialize variables. */
921	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
922	/** The term function. */
923	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
924	/** The VMR3WaitHaltedU function. */
925	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
926	/** The VMR3WaitU function. */
927	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
928	/** The VMR3NotifyCpuFFU function. */
929	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
930	/** The VMR3NotifyGlobalFFU function. */
931	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
932	} g_aHaltMethods[] =
933	{
934	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
935	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
936	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
937	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
938	};
939
940
941	/**
942	* Notify the emulation thread (EMT) about pending Forced Action (FF).
943	*
944	* This function is called by thread other than EMT to make
945	* sure EMT wakes up and promptly service an FF request.
946	*
947	* @param pUVM Pointer to the user mode VM structure.
948	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
949	*/
950	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
951	{
952	LogFlow(("VMR3NotifyGlobalFFU:\n"));
953	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
954
955	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
956	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
957	else
958	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
959	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
960	}
961
962
963	/**
964	* Notify the emulation thread (EMT) about pending Forced Action (FF).
965	*
966	* This function is called by thread other than EMT to make
967	* sure EMT wakes up and promptly service an FF request.
968	*
969	* @param pUVM Pointer to the user mode VM structure.
970	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
971	*/
972	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
973	{
974	PUVM pUVM = pUVCpu->pUVM;
975
976	LogFlow(("VMR3NotifyCpuFFU:\n"));
977	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
978	}
979
980
981	/**
982	* Halted VM Wait.
983	* Any external event will unblock the thread.
984	*
985	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
986	* case an appropriate status code is returned.
987	* @param pVM VM handle.
988	* @param pVCpu VMCPU handle.
989	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
990	* @thread The emulation thread.
991	*/
992	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
993	{
994	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
995
996	/*
997	* Check Relevant FFs.
998	*/
999	const uint32_t fMask = !fIgnoreInterrupts
1000	? VMCPU_FF_EXTERNAL_HALTED_MASK
1001	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
1002	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1003	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
1004	{
1005	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1006	return VINF_SUCCESS;
1007	}
1008
1009	/*
1010	* The yielder is suspended while we're halting, while TM might have clock(s) running
1011	* only at certain times and need to be notified..
1012	*/
1013	if (pVCpu->idCpu == 0)
1014	VMMR3YieldSuspend(pVM);
1015	TMNotifyStartOfHalt(pVCpu);
1016
1017	/*
1018	* Record halt averages for the last second.
1019	*/
1020	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1021	uint64_t u64Now = RTTimeNanoTS();
1022	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1023	if (off > 1000000000)
1024	{
1025	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1026	{
1027	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1028	pUVCpu->vm.s.HaltFrequency = 1;
1029	}
1030	else
1031	{
1032	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1033	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1034	}
1035	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1036	pUVCpu->vm.s.cHalts = 0;
1037	}
1038	pUVCpu->vm.s.cHalts++;
1039
1040	/*
1041	* Do the halt.
1042	*/
1043	Assert(VMCPU_GET_STATE(pVCpu) == VMCPUSTATE_STARTED);
1044	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1045	PUVM pUVM = pUVCpu->pUVM;
1046	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1047	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1048
1049	/*
1050	* Notify TM and resume the yielder
1051	*/
1052	TMNotifyEndOfHalt(pVCpu);
1053	if (pVCpu->idCpu == 0)
1054	VMMR3YieldResume(pVM);
1055
1056	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1057	return rc;
1058	}
1059
1060
1061	/**
1062	* Suspended VM Wait.
1063	* Only a handful of forced actions will cause the function to
1064	* return to the caller.
1065	*
1066	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1067	* case an appropriate status code is returned.
1068	* @param pUVCpu Pointer to the user mode VMCPU structure.
1069	* @thread The emulation thread.
1070	*/
1071	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1072	{
1073	LogFlow(("VMR3WaitU:\n"));
1074
1075	/*
1076	* Check Relevant FFs.
1077	*/
1078	PVM pVM = pUVCpu->pVM;
1079	PVMCPU pVCpu = pUVCpu->pVCpu;
1080
1081	if ( pVM
1082	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1083	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1084	)
1085	)
1086	{
1087	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1088	return VINF_SUCCESS;
1089	}
1090
1091	/*
1092	* Do waiting according to the halt method (so VMR3NotifyFF
1093	* doesn't have to special case anything).
1094	*/
1095	PUVM pUVM = pUVCpu->pUVM;
1096	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1097	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 0));
1098	return rc;
1099	}
1100
1101
1102	/**
1103	* Rendezvous callback that will be called once.
1104	*
1105	* @returns VBox strict status code.
1106	* @param pVM VM handle.
1107	* @param pVCpu The VMCPU handle for the calling EMT.
1108	* @param pvUser The new g_aHaltMethods index.
1109	*/
1110	static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1111	{
1112	PUVM pUVM = pVM->pUVM;
1113	uintptr_t i = (uintptr_t)pvUser;
1114	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1115	NOREF(pVCpu);
1116
1117	/*
1118	* Terminate the old one.
1119	*/
1120	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1121	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1122	{
1123	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1124	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1125	}
1126
1127	/* Assert that the failure fallback is where we expect. */
1128	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1129	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1130
1131	/*
1132	* Init the new one.
1133	*/
1134	int rc = VINF_SUCCESS;
1135	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1136	if (g_aHaltMethods[i].pfnInit)
1137	{
1138	rc = g_aHaltMethods[i].pfnInit(pUVM);
1139	if (RT_FAILURE(rc))
1140	{
1141	/* Fall back on the bootstrap method. This requires no
1142	init/term (see assertion above), and will always work. */
1143	AssertLogRelRC(rc);
1144	i = 0;
1145	}
1146	}
1147
1148	/*
1149	* Commit it.
1150	*/
1151	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1152	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1153
1154	return rc;
1155	}
1156
1157
1158	/**
1159	* Changes the halt method.
1160	*
1161	* @returns VBox status code.
1162	* @param pUVM Pointer to the user mode VM structure.
1163	* @param enmHaltMethod The new halt method.
1164	* @thread EMT.
1165	*/
1166	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1167	{
1168	PVM pVM = pUVM->pVM; Assert(pVM);
1169	VM_ASSERT_EMT(pVM);
1170	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1171
1172	/*
1173	* Resolve default (can be overridden in the configuration).
1174	*/
1175	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1176	{
1177	uint32_t u32;
1178	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1179	if (RT_SUCCESS(rc))
1180	{
1181	enmHaltMethod = (VMHALTMETHOD)u32;
1182	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1183	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1184	}
1185	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1186	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1187	else
1188	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1189	//enmHaltMethod = VMHALTMETHOD_1;
1190	//enmHaltMethod = VMHALTMETHOD_OLD;
1191	}
1192	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1193
1194	/*
1195	* Find the descriptor.
1196	*/
1197	unsigned i = 0;
1198	while ( i < RT_ELEMENTS(g_aHaltMethods)
1199	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1200	i++;
1201	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1202
1203	/*
1204	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1205	*/
1206	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1207	}
1208

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 24442

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