VMEmt.cpp@ 19279

Last change on this file since 19279 was 19257, checked in by vboxsync, 16 years ago
Reapplied 46658 + fix
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1	/* $Id: VMEmt.cpp 19257 2009-04-29 11:51:55Z 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	* The emulation thread.
49	*
50	* @returns Thread exit code.
51	* @param ThreadSelf The handle to the executing thread.
52	* @param pvArgs Pointer to the user mode VM structure (UVM).
53	*/
54	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
55	{
56	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
57	PUVM pUVM = pUVCpu->pUVM;
58	RTCPUID idCpu = pUVCpu->idCpu;
59	int rc;
60
61	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
62	("Invalid arguments to the emulation thread!\n"));
63
64	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
65	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
66
67	/*
68	* The request loop.
69	*/
70	rc = VINF_SUCCESS;
71	volatile VMSTATE enmBefore = VMSTATE_CREATING; /* volatile because of setjmp */
72	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
73	for (;;)
74	{
75	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
76	if (setjmp(pUVCpu->vm.s.emtJumpEnv) != 0)
77	{
78	rc = VINF_SUCCESS;
79	break;
80	}
81
82	/*
83	* During early init there is no pVM, so make a special path
84	* for that to keep things clearly separate.
85	*/
86	if (!pUVM->pVM)
87	{
88	/*
89	* Check for termination first.
90	*/
91	if (pUVM->vm.s.fTerminateEMT)
92	{
93	rc = VINF_EM_TERMINATE;
94	break;
95	}
96
97	if ( pUVM->vm.s.pReqs
98	&& pUVCpu->idCpu == 0 /* Only the first VCPU may initialize the VM during early init */)
99	{
100	/*
101	* Service execute in EMT request.
102	*/
103	rc = VMR3ReqProcessU(pUVM, VMREQDEST_ANY);
104	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
105	}
106	else
107	if (pUVCpu->vm.s.pReqs)
108	{
109	/*
110	* Service execute in EMT request.
111	*/
112	rc = VMR3ReqProcessU(pUVM, (VMREQDEST)pUVCpu->idCpu);
113	Log(("vmR3EmulationThread: Req (cpu=%d) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
114	}
115	else
116	{
117	/*
118	* Nothing important is pending, so wait for something.
119	*/
120	rc = VMR3WaitU(pUVCpu);
121	if (RT_FAILURE(rc))
122	break;
123	}
124	}
125	else
126	{
127
128	/*
129	* Pending requests which needs servicing?
130	*
131	* We check for state changes in addition to status codes when
132	* servicing requests. (Look after the ifs.)
133	*/
134	PVM pVM = pUVM->pVM;
135	enmBefore = pVM->enmVMState;
136	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
137	\|\| pUVM->vm.s.fTerminateEMT)
138	{
139	rc = VINF_EM_TERMINATE;
140	break;
141	}
142	if (pUVM->vm.s.pReqs)
143	{
144	/*
145	* Service execute in EMT request.
146	*/
147	rc = VMR3ReqProcessU(pUVM, VMREQDEST_ANY);
148	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
149	}
150	else if (pUVCpu->vm.s.pReqs)
151	{
152	/*
153	* Service execute in EMT request.
154	*/
155	rc = VMR3ReqProcessU(pUVM, (VMREQDEST)pUVCpu->idCpu);
156	Log(("vmR3EmulationThread: Req (cpu=%d)rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pVM->enmVMState));
157	}
158	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
159	{
160	/*
161	* Service the debugger request.
162	*/
163	rc = DBGFR3VMMForcedAction(pVM);
164	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
165	}
166	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
167	{
168	/*
169	* Service a delayed reset request.
170	*/
171	rc = VMR3Reset(pVM);
172	VM_FF_CLEAR(pVM, VM_FF_RESET);
173	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
174	}
175	else
176	{
177	/*
178	* Nothing important is pending, so wait for something.
179	*/
180	rc = VMR3WaitU(pUVCpu);
181	if (RT_FAILURE(rc))
182	break;
183	}
184
185	/*
186	* Check for termination requests, these have extremely high priority.
187	*/
188	if ( rc == VINF_EM_TERMINATE
189	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
190	\|\| pUVM->vm.s.fTerminateEMT)
191	break;
192	}
193
194	/*
195	* Some requests (both VMR3Req* and the DBGF) can potentially
196	* resume or start the VM, in that case we'll get a change in
197	* VM status indicating that we're now running.
198	*/
199	if ( RT_SUCCESS(rc)
200	&& pUVM->pVM
201	&& enmBefore != pUVM->pVM->enmVMState
202	&& pUVM->pVM->enmVMState == VMSTATE_RUNNING)
203	{
204	PVM pVM = pUVM->pVM;
205	PVMCPU pVCpu = &pVM->aCpus[idCpu];
206
207	rc = EMR3ExecuteVM(pVM, pVCpu);
208	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
209	if ( EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION
210	&& pVM->enmVMState == VMSTATE_RUNNING)
211	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
212	}
213
214	} /* forever */
215
216
217	/*
218	* Exiting.
219	*/
220	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
221	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
222	if (pUVM->vm.s.fEMTDoesTheCleanup)
223	{
224	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
225	Assert(pUVM->pVM);
226	vmR3Destroy(pUVM->pVM);
227	vmR3DestroyFinalBitFromEMT(pUVM);
228	}
229	else
230	{
231	vmR3DestroyFinalBitFromEMT(pUVM);
232
233	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
234	}
235	Log(("vmR3EmulationThread: EMT is terminated.\n"));
236	return rc;
237	}
238
239
240	#if 0 /* not used */
241	/**
242	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
243	* In case the VM is stopped, clean up and long jump to the main EMT loop.
244	*
245	* @returns VINF_SUCCESS or doesn't return
246	* @param pVM VM handle.
247	*/
248	VMMR3DECL(int) VMR3WaitForResume(PVM pVM)
249	{
250	/*
251	* The request loop.
252	*/
253	PUVMCPU pUVCpu;
254	PUVM pUVM = pVM->pUVM;
255	VMSTATE enmBefore;
256	int rc;
257
258	pUVCpu = (PUVMCPU)RTTlsGet(pUVM->vm.s.idxTLS);
259	AssertReturn(pUVCpu, VERR_INTERNAL_ERROR);
260
261	for (;;)
262	{
263
264	/*
265	* Pending requests which needs servicing?
266	*
267	* We check for state changes in addition to status codes when
268	* servicing requests. (Look after the ifs.)
269	*/
270	enmBefore = pVM->enmVMState;
271	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
272	\|\| pUVM->vm.s.fTerminateEMT)
273	{
274	rc = VINF_EM_TERMINATE;
275	break;
276	}
277	else if (pUVM->vm.s.pReqs)
278	{
279	/*
280	* Service execute in EMT request.
281	*/
282	rc = VMR3ReqProcessU(pUVM, VMREQDEST_ANY);
283	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
284	}
285	else if (pUVCpu->vm.s.pReqs)
286	{
287	/*
288	* Service execute in EMT request.
289	*/
290	rc = VMR3ReqProcessU(pUVM, (VMREQDEST)pUVCpu->idCpu);
291	Log(("vmR3EmulationThread: Req (cpu=%d)rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pVM->enmVMState));
292	}
293	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
294	{
295	/*
296	* Service the debugger request.
297	*/
298	rc = DBGFR3VMMForcedAction(pVM);
299	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
300	}
301	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
302	{
303	/*
304	* Service a delay reset request.
305	*/
306	rc = VMR3Reset(pVM);
307	VM_FF_CLEAR(pVM, VM_FF_RESET);
308	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
309	}
310	else
311	{
312	/*
313	* Nothing important is pending, so wait for something.
314	*/
315	rc = VMR3WaitU(pUVCpu);
316	if (RT_FAILURE(rc))
317	break;
318	}
319
320	/*
321	* Check for termination requests, these are extremely high priority.
322	*/
323	if ( rc == VINF_EM_TERMINATE
324	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
325	\|\| pUVM->vm.s.fTerminateEMT)
326	break;
327
328	/*
329	* Some requests (both VMR3Req* and the DBGF) can potentially
330	* resume or start the VM, in that case we'll get a change in
331	* VM status indicating that we're now running.
332	*/
333	if ( RT_SUCCESS(rc)
334	&& enmBefore != pVM->enmVMState
335	&& pVM->enmVMState == VMSTATE_RUNNING)
336	{
337	/* Only valid exit reason. */
338	return VINF_SUCCESS;
339	}
340
341	} /* forever */
342
343	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
344	longjmp(pUVCpu->vm.s.emtJumpEnv, 1);
345	}
346	#endif
347
348	/**
349	* Gets the name of a halt method.
350	*
351	* @returns Pointer to a read only string.
352	* @param enmMethod The method.
353	*/
354	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
355	{
356	switch (enmMethod)
357	{
358	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
359	case VMHALTMETHOD_DEFAULT: return "default";
360	case VMHALTMETHOD_OLD: return "old";
361	case VMHALTMETHOD_1: return "method1";
362	//case VMHALTMETHOD_2: return "method2";
363	case VMHALTMETHOD_GLOBAL_1: return "global1";
364	default: return "unknown";
365	}
366	}
367
368
369	/**
370	* The old halt loop.
371	*/
372	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
373	{
374	/*
375	* Halt loop.
376	*/
377	PVM pVM = pUVCpu->pVM;
378	PVMCPU pVCpu = pUVCpu->pVCpu;
379
380	int rc = VINF_SUCCESS;
381	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
382	//unsigned cLoops = 0;
383	for (;;)
384	{
385	/*
386	* Work the timers and check if we can exit.
387	* The poll call gives us the ticks left to the next event in
388	* addition to perhaps set an FF.
389	*/
390	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
391	TMR3TimerQueuesDo(pVM);
392	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
393	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
394	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
395	break;
396	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
397	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
398	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
399	break;
400
401	/*
402	* Wait for a while. Someone will wake us up or interrupt the call if
403	* anything needs our attention.
404	*/
405	if (u64NanoTS < 50000)
406	{
407	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
408	/* spin */;
409	}
410	else
411	{
412	VMMR3YieldStop(pVM);
413	//uint64_t u64Start = RTTimeNanoTS();
414	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
415	{
416	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
417	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
418	RTThreadYield(); /* this is the best we can do here */
419	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
420	}
421	else if (u64NanoTS < 2000000)
422	{
423	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
424	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
425	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
426	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
427	}
428	else
429	{
430	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
431	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
432	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
433	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
434	}
435	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
436	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
437	}
438	if (rc == VERR_TIMEOUT)
439	rc = VINF_SUCCESS;
440	else if (RT_FAILURE(rc))
441	{
442	AssertRC(rc != VERR_INTERRUPTED);
443	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
444	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
445	VM_FF_SET(pVM, VM_FF_TERMINATE);
446	rc = VERR_INTERNAL_ERROR;
447	break;
448	}
449	}
450
451	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
452	return rc;
453	}
454
455
456	/**
457	* Initialize the configuration of halt method 1 & 2.
458	*
459	* @return VBox status code. Failure on invalid CFGM data.
460	* @param pVM The VM handle.
461	*/
462	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
463	{
464	/*
465	* The defaults.
466	*/
467	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
468	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
469	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
470	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
471	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
472	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
473	#else
474	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
475	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
476	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
477	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
478	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
479	#endif
480
481	/*
482	* Query overrides.
483	*
484	* I don't have time to bother with niceities such as invalid value checks
485	* here right now. sorry.
486	*/
487	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
488	if (pCfg)
489	{
490	uint32_t u32;
491	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
492	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
493	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
494	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
495	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
496	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
497	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
498	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
499	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
500	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
501	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
502	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
503	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
504	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
505	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
506	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
507	}
508
509	return VINF_SUCCESS;
510	}
511
512
513	/**
514	* Initialize halt method 1.
515	*
516	* @return VBox status code.
517	* @param pUVM Pointer to the user mode VM structure.
518	*/
519	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
520	{
521	return vmR3HaltMethod12ReadConfigU(pUVM);
522	}
523
524
525	/**
526	* Method 1 - Block whenever possible, and when lagging behind
527	* switch to spinning for 10-30ms with occational blocking until
528	* the lag has been eliminated.
529	*/
530	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
531	{
532	PUVM pUVM = pUVCpu->pUVM;
533	PVMCPU pVCpu = pUVCpu->pVCpu;
534	PVM pVM = pUVCpu->pVM;
535
536	/*
537	* To simplify things, we decide up-front whether we should switch to spinning or
538	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
539	* and that it will generate interrupts or other events that will cause us to exit
540	* the halt loop.
541	*/
542	bool fBlockOnce = false;
543	bool fSpinning = false;
544	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
545	if (u32CatchUpPct /* non-zero if catching up */)
546	{
547	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
548	{
549	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
550	if (fSpinning)
551	{
552	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
553	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
554	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
555	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
556	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
557	}
558	else
559	{
560	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
561	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
562	}
563	}
564	else
565	{
566	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
567	if (fSpinning)
568	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
569	}
570	}
571	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
572	{
573	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
574	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
575	}
576
577	/*
578	* Halt loop.
579	*/
580	int rc = VINF_SUCCESS;
581	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
582	unsigned cLoops = 0;
583	for (;; cLoops++)
584	{
585	/*
586	* Work the timers and check if we can exit.
587	*/
588	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
589	TMR3TimerQueuesDo(pVM);
590	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
591	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
592	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
593	break;
594
595	/*
596	* Estimate time left to the next event.
597	*/
598	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
599	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
600	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
601	break;
602
603	/*
604	* Block if we're not spinning and the interval isn't all that small.
605	*/
606	if ( ( !fSpinning
607	\|\| fBlockOnce)
608	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
609	&& u64NanoTS >= 100000) /* 0.100 ms */
610	#else
611	&& u64NanoTS >= 250000) /* 0.250 ms */
612	#endif
613	{
614	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
615	VMMR3YieldStop(pVM);
616
617	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
618	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
619	cMilliSecs = 1;
620	else
621	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
622	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
623	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
624	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
625	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
626	if (rc == VERR_TIMEOUT)
627	rc = VINF_SUCCESS;
628	else if (RT_FAILURE(rc))
629	{
630	AssertRC(rc != VERR_INTERRUPTED);
631	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
632	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
633	VM_FF_SET(pVM, VM_FF_TERMINATE);
634	rc = VERR_INTERNAL_ERROR;
635	break;
636	}
637
638	/*
639	* Calc the statistics.
640	* Update averages every 16th time, and flush parts of the history every 64th time.
641	*/
642	const uint64_t Elapsed = RTTimeNanoTS() - Start;
643	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
644	if (Elapsed > u64NanoTS)
645	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
646	pUVCpu->vm.s.Halt.Method12.cBlocks++;
647	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
648	{
649	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
650	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
651	{
652	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
653	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
654	}
655	}
656	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
657
658	/*
659	* Clear the block once flag if we actually blocked.
660	*/
661	if ( fBlockOnce
662	&& Elapsed > 100000 /* 0.1 ms */)
663	fBlockOnce = false;
664	}
665	}
666	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
667
668	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
669	return rc;
670	}
671
672
673	/**
674	* Initialize the global 1 halt method.
675	*
676	* @return VBox status code.
677	* @param pUVM Pointer to the user mode VM structure.
678	*/
679	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
680	{
681	return VINF_SUCCESS;
682	}
683
684
685	/**
686	* The global 1 halt method - Block in GMM (ring-0) and let it
687	* try take care of the global scheduling of EMT threads.
688	*/
689	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
690	{
691	PUVM pUVM = pUVCpu->pUVM;
692	PVMCPU pVCpu = pUVCpu->pVCpu;
693	PVM pVM = pUVCpu->pVM;
694
695	/*
696	* Halt loop.
697	*/
698	int rc = VINF_SUCCESS;
699	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
700	unsigned cLoops = 0;
701	for (;; cLoops++)
702	{
703	/*
704	* Work the timers and check if we can exit.
705	*/
706	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
707	TMR3TimerQueuesDo(pVM);
708	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
709	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
710	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
711	break;
712
713	/*
714	* Estimate time left to the next event.
715	*/
716	uint64_t u64Delta;
717	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
718	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
719	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
720	break;
721
722	/*
723	* Block if we're not spinning and the interval isn't all that small.
724	*/
725	if (u64Delta > 50000 /* 0.050ms */)
726	{
727	VMMR3YieldStop(pVM);
728	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
729	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
730	break;
731
732	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
733	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
734	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
735	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
736	if (rc == VERR_INTERRUPTED)
737	rc = VINF_SUCCESS;
738	else if (RT_FAILURE(rc))
739	{
740	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc));
741	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
742	VM_FF_SET(pVM, VM_FF_TERMINATE);
743	rc = VERR_INTERNAL_ERROR;
744	break;
745	}
746	}
747	/*
748	* When spinning call upon the GVMM and do some wakups once
749	* in a while, it's not like we're actually busy or anything.
750	*/
751	else if (!(cLoops & 0x1fff))
752	{
753	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
754	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
755	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
756	}
757	}
758	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
759
760	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
761	return rc;
762	}
763
764
765	/**
766	* The global 1 halt method - VMR3Wait() worker.
767	*
768	* @returns VBox status code.
769	* @param pUVCpu Pointer to the user mode VMCPU structure.
770	*/
771	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
772	{
773	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
774
775	PVM pVM = pUVCpu->pUVM->pVM;
776	PVMCPU pVCpu = VMMGetCpu(pVM);
777
778	int rc = VINF_SUCCESS;
779	for (;;)
780	{
781	/*
782	* Check Relevant FFs.
783	*/
784	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
785	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
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 = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
793	if (rc == VERR_INTERRUPTED)
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	VM_FF_SET(pVM, VM_FF_TERMINATE);
800	rc = VERR_INTERNAL_ERROR;
801	break;
802	}
803
804	}
805
806	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
807	return rc;
808	}
809
810
811	/**
812	* The global 1 halt method - VMR3NotifyFF() worker.
813	*
814	* @param pUVCpu Pointer to the user mode VMCPU structure.
815	* @param fNotifiedREM See VMR3NotifyFF().
816	*/
817	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyFF(PUVMCPU pUVCpu, bool fNotifiedREM)
818	{
819	if (pUVCpu->vm.s.fWait)
820	{
821	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
822	AssertRC(rc);
823	}
824	else if (!fNotifiedREM)
825	REMR3NotifyFF(pUVCpu->pVM);
826	}
827
828
829	/**
830	* Bootstrap VMR3Wait() worker.
831	*
832	* @returns VBox status code.
833	* @param pUVMCPU Pointer to the user mode VMCPU structure.
834	*/
835	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
836	{
837	PUVM pUVM = pUVCpu->pUVM;
838
839	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
840
841	int rc = VINF_SUCCESS;
842	for (;;)
843	{
844	/*
845	* Check Relevant FFs.
846	*/
847	if (pUVM->vm.s.pReqs) /* global requests pending? */
848	break;
849	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
850	break;
851
852	if ( pUVCpu->pVM
853	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
854	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
855	)
856	)
857	break;
858	if (pUVCpu->vm.s.fTerminateEMT)
859	break;
860
861	/*
862	* Wait for a while. Someone will wake us up or interrupt the call if
863	* anything needs our attention.
864	*/
865	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
866	if (rc == VERR_TIMEOUT)
867	rc = VINF_SUCCESS;
868	else if (RT_FAILURE(rc))
869	{
870	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
871	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
872	if (pUVCpu->pVM)
873	VM_FF_SET(pUVCpu->pVM, VM_FF_TERMINATE);
874	rc = VERR_INTERNAL_ERROR;
875	break;
876	}
877
878	}
879
880	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
881	return rc;
882	}
883
884
885	/**
886	* Bootstrap VMR3NotifyFF() worker.
887	*
888	* @param pUVCpu Pointer to the user mode VMCPU structure.
889	* @param fNotifiedREM See VMR3NotifyFF().
890	*/
891	static DECLCALLBACK(void) vmR3BootstrapNotifyFF(PUVMCPU pUVCpu, bool fNotifiedREM)
892	{
893	if (pUVCpu->vm.s.fWait)
894	{
895	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
896	AssertRC(rc);
897	}
898	}
899
900
901	/**
902	* Default VMR3Wait() worker.
903	*
904	* @returns VBox status code.
905	* @param pUVMCPU Pointer to the user mode VMCPU structure.
906	*/
907	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
908	{
909	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
910
911	PVM pVM = pUVCpu->pVM;
912	PVMCPU pVCpu = pUVCpu->pVCpu;
913	int rc = VINF_SUCCESS;
914	for (;;)
915	{
916	/*
917	* Check Relevant FFs.
918	*/
919	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
920	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
921	break;
922
923	/*
924	* Wait for a while. Someone will wake us up or interrupt the call if
925	* anything needs our attention.
926	*/
927	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
928	if (rc == VERR_TIMEOUT)
929	rc = VINF_SUCCESS;
930	else if (RT_FAILURE(rc))
931	{
932	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
933	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
934	VM_FF_SET(pVM, VM_FF_TERMINATE);
935	rc = VERR_INTERNAL_ERROR;
936	break;
937	}
938
939	}
940
941	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
942	return rc;
943	}
944
945
946	/**
947	* Default VMR3NotifyFF() worker.
948	*
949	* @param pUVCpu Pointer to the user mode VMCPU structure.
950	* @param fNotifiedREM See VMR3NotifyFF().
951	*/
952	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PUVMCPU pUVCpu, bool fNotifiedREM)
953	{
954	if (pUVCpu->vm.s.fWait)
955	{
956	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
957	AssertRC(rc);
958	}
959	else if (!fNotifiedREM)
960	REMR3NotifyFF(pUVCpu->pVM);
961	}
962
963
964	/**
965	* Array with halt method descriptors.
966	* VMINT::iHaltMethod contains an index into this array.
967	*/
968	static const struct VMHALTMETHODDESC
969	{
970	/** The halt method id. */
971	VMHALTMETHOD enmHaltMethod;
972	/** The init function for loading config and initialize variables. */
973	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
974	/** The term function. */
975	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
976	/** The halt function. */
977	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
978	/** The wait function. */
979	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
980	/** The notifyFF function. */
981	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PUVMCPU pUVCpu, bool fNotifiedREM));
982	} g_aHaltMethods[] =
983	{
984	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyFF },
985	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
986	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyFF },
987	{ VMHALTMETHOD_GLOBAL_1,vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyFF },
988	};
989
990
991	/**
992	* Notify the emulation thread (EMT) about pending Forced Action (FF).
993	*
994	* This function is called by thread other than EMT to make
995	* sure EMT wakes up and promptly service an FF request.
996	*
997	* @param pVM VM handle.
998	* @param pVCpu VMCPU handle (NULL if all/global notification)
999	* @param fNotifiedREM Set if REM have already been notified. If clear the
1000	* generic REMR3NotifyFF() method is called.
1001	*/
1002	VMMR3DECL(void) VMR3NotifyGlobalFF(PVM pVM, bool fNotifiedREM)
1003	{
1004	PUVM pUVM = pVM->pUVM;
1005
1006	LogFlow(("VMR3NotifyFF:\n"));
1007	/** @todo might want to have a 2nd look at this (SMP) */
1008	for (unsigned iCpu=0;iCpu<pVM->cCPUs;iCpu++)
1009	{
1010	PUVMCPU pUVCpu = pVM->aCpus[iCpu].pUVCpu;
1011	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVCpu, fNotifiedREM);
1012	}
1013	}
1014
1015	/**
1016	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1017	*
1018	* This function is called by thread other than EMT to make
1019	* sure EMT wakes up and promptly service an FF request.
1020	*
1021	* @param pVM VM handle.
1022	* @param pVCpu VMCPU handle (NULL if all/global notification)
1023	* @param fNotifiedREM Set if REM have already been notified. If clear the
1024	* generic REMR3NotifyFF() method is called.
1025	*/
1026	VMMR3DECL(void) VMR3NotifyCpuFF(PVMCPU pVCpu, bool fNotifiedREM)
1027	{
1028	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1029	PUVM pUVM = pUVCpu->pUVM;
1030
1031	LogFlow(("VMR3NotifyCpuFF:\n"));
1032	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVCpu, fNotifiedREM);
1033	}
1034
1035
1036	/**
1037	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1038	*
1039	* This function is called by thread other than EMT to make
1040	* sure EMT wakes up and promptly service an FF request.
1041	*
1042	* @param pUVM Pointer to the user mode VM structure.
1043	* @param fNotifiedREM Set if REM have already been notified. If clear the
1044	* generic REMR3NotifyFF() method is called.
1045	*/
1046	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, bool fNotifiedREM)
1047	{
1048	LogFlow(("VMR3NotifyGlobalFFU:\n"));
1049	/** @todo might want to have a 2nd look at this (SMP) */
1050	for (unsigned iCpu=0;iCpu<pUVM->cCpus;iCpu++)
1051	{
1052	PUVMCPU pUVCpu = &pUVM->aCpus[iCpu];
1053	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVCpu, fNotifiedREM);
1054	}
1055	}
1056
1057	/**
1058	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1059	*
1060	* This function is called by thread other than EMT to make
1061	* sure EMT wakes up and promptly service an FF request.
1062	*
1063	* @param pUVM Pointer to the user mode VM structure.
1064	* @param fNotifiedREM Set if REM have already been notified. If clear the
1065	* generic REMR3NotifyFF() method is called.
1066	*/
1067	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, bool fNotifiedREM)
1068	{
1069	PUVM pUVM = pUVCpu->pUVM;
1070
1071	LogFlow(("VMR3NotifyCpuFFU:\n"));
1072	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVCpu, fNotifiedREM);
1073	}
1074
1075
1076	/**
1077	* Halted VM Wait.
1078	* Any external event will unblock the thread.
1079	*
1080	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1081	* case an appropriate status code is returned.
1082	* @param pVM VM handle.
1083	* @param pVCpu VMCPU handle.
1084	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
1085	* @thread The emulation thread.
1086	*/
1087	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
1088	{
1089	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
1090
1091	/*
1092	* Check Relevant FFs.
1093	*/
1094	const uint32_t fMask = !fIgnoreInterrupts
1095	? VMCPU_FF_EXTERNAL_HALTED_MASK
1096	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
1097	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1098	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
1099	{
1100	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1101	return VINF_SUCCESS;
1102	}
1103
1104	/*
1105	* The yielder is suspended while we're halting, while TM might have clock(s) running
1106	* only at certain times and need to be notified..
1107	*/
1108	VMMR3YieldSuspend(pVM);
1109	TMNotifyStartOfHalt(pVCpu);
1110
1111	/*
1112	* Record halt averages for the last second.
1113	*/
1114	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1115	uint64_t u64Now = RTTimeNanoTS();
1116	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1117	if (off > 1000000000)
1118	{
1119	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1120	{
1121	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1122	pUVCpu->vm.s.HaltFrequency = 1;
1123	}
1124	else
1125	{
1126	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1127	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1128	}
1129	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1130	pUVCpu->vm.s.cHalts = 0;
1131	}
1132	pUVCpu->vm.s.cHalts++;
1133
1134	/*
1135	* Do the halt.
1136	*/
1137	PUVM pUVM = pUVCpu->pUVM;
1138	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1139
1140	/*
1141	* Notify TM and resume the yielder
1142	*/
1143	TMNotifyEndOfHalt(pVCpu);
1144	VMMR3YieldResume(pVM);
1145
1146	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1147	return rc;
1148	}
1149
1150
1151	/**
1152	* Suspended VM Wait.
1153	* Only a handful of forced actions will cause the function to
1154	* return to the caller.
1155	*
1156	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1157	* case an appropriate status code is returned.
1158	* @param pUVCpu Pointer to the user mode VMCPU structure.
1159	* @thread The emulation thread.
1160	*/
1161	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1162	{
1163	LogFlow(("VMR3WaitU:\n"));
1164
1165	/*
1166	* Check Relevant FFs.
1167	*/
1168	PVM pVM = pUVCpu->pVM;
1169	PVMCPU pVCpu = pUVCpu->pVCpu;
1170
1171	if ( pVM
1172	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1173	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1174	)
1175	)
1176	{
1177	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1178	return VINF_SUCCESS;
1179	}
1180
1181	/*
1182	* Do waiting according to the halt method (so VMR3NotifyFF
1183	* doesn't have to special case anything).
1184	*/
1185	PUVM pUVM = pUVCpu->pUVM;
1186	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1187	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 0));
1188	return rc;
1189	}
1190
1191
1192	/**
1193	* Changes the halt method.
1194	*
1195	* @returns VBox status code.
1196	* @param pUVM Pointer to the user mode VM structure.
1197	* @param enmHaltMethod The new halt method.
1198	* @thread EMT.
1199	*/
1200	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1201	{
1202	PVM pVM = pUVM->pVM; Assert(pVM);
1203	VM_ASSERT_EMT(pVM);
1204	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1205
1206	/*
1207	* Resolve default (can be overridden in the configuration).
1208	*/
1209	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1210	{
1211	uint32_t u32;
1212	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1213	if (RT_SUCCESS(rc))
1214	{
1215	enmHaltMethod = (VMHALTMETHOD)u32;
1216	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1217	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1218	}
1219	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1220	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1221	else
1222	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1223	//enmHaltMethod = VMHALTMETHOD_1;
1224	//enmHaltMethod = VMHALTMETHOD_OLD;
1225	}
1226	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1227
1228	/*
1229	* Find the descriptor.
1230	*/
1231	unsigned i = 0;
1232	while ( i < RT_ELEMENTS(g_aHaltMethods)
1233	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1234	i++;
1235	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1236
1237	/*
1238	* Terminate the old one.
1239	*/
1240	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1241	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1242	{
1243	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1244	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1245	}
1246
1247	/*
1248	* Init the new one.
1249	*/
1250	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1251	if (g_aHaltMethods[i].pfnInit)
1252	{
1253	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1254	AssertRCReturn(rc, rc);
1255	}
1256	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1257
1258	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1259	return VINF_SUCCESS;
1260	}
1261

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 19279

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