VMEmt.cpp@ 61628

Last change on this file since 61628 was 61628, checked in by vboxsync, 8 years ago
DBGF: Added bsod_msr event, stubbed bsod_efi event. Since we cannot return VINF_EM_DBG_EVENT from an MSR handler, VMCPU_FF_DBGF was introduced as an alternative.
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File size: 47.8 KB

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1	/* $Id: VMEmt.cpp 61628 2016-06-09 17:52:51Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 Oracle Corporation
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
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VM
23	#include <VBox/vmm/tm.h>
24	#include <VBox/vmm/dbgf.h>
25	#include <VBox/vmm/em.h>
26	#include <VBox/vmm/pdmapi.h>
27	#ifdef VBOX_WITH_REM
28	# include <VBox/vmm/rem.h>
29	#endif
30	#include <VBox/vmm/tm.h>
31	#include "VMInternal.h"
32	#include <VBox/vmm/vm.h>
33	#include <VBox/vmm/uvm.h>
34
35	#include <VBox/err.h>
36	#include <VBox/log.h>
37	#include <iprt/assert.h>
38	#include <iprt/asm.h>
39	#include <iprt/asm-math.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/string.h>
42	#include <iprt/thread.h>
43	#include <iprt/time.h>
44
45
46	/*********************************************************************************************************************************
47	* Internal Functions *
48	*********************************************************************************************************************************/
49	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
50
51
52	/**
53	* The emulation thread main function.
54	*
55	* @returns Thread exit code.
56	* @param ThreadSelf The handle to the executing thread.
57	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
58	*/
59	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
60	{
61	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
62	return vmR3EmulationThreadWithId(ThreadSelf, pUVCpu, pUVCpu->idCpu);
63	}
64
65
66	/**
67	* The emulation thread main function, with Virtual CPU ID for debugging.
68	*
69	* @returns Thread exit code.
70	* @param ThreadSelf The handle to the executing thread.
71	* @param pUVCpu Pointer to the user mode per-VCpu structure.
72	* @param idCpu The virtual CPU ID, for backtrace purposes.
73	*/
74	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
75	{
76	PUVM pUVM = pUVCpu->pUVM;
77	int rc;
78
79	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
80	("Invalid arguments to the emulation thread!\n"));
81
82	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
83	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
84
85	if ( pUVM->pVmm2UserMethods
86	&& pUVM->pVmm2UserMethods->pfnNotifyEmtInit)
87	pUVM->pVmm2UserMethods->pfnNotifyEmtInit(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
88
89	/*
90	* The request loop.
91	*/
92	rc = VINF_SUCCESS;
93	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
94	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
95	for (;;)
96	{
97	/*
98	* During early init there is no pVM, so make a special path
99	* for that to keep things clearly separate.
100	*/
101	if (!pUVM->pVM)
102	{
103	/*
104	* Check for termination first.
105	*/
106	if (pUVM->vm.s.fTerminateEMT)
107	{
108	rc = VINF_EM_TERMINATE;
109	break;
110	}
111
112	/*
113	* Only the first VCPU may initialize the VM during early init
114	* and must therefore service all VMCPUID_ANY requests.
115	* See also VMR3Create
116	*/
117	if ( (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
118	&& pUVCpu->idCpu == 0)
119	{
120	/*
121	* Service execute in any EMT request.
122	*/
123	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
124	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
125	}
126	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
127	{
128	/*
129	* Service execute in specific EMT request.
130	*/
131	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
132	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
133	}
134	else
135	{
136	/*
137	* Nothing important is pending, so wait for something.
138	*/
139	rc = VMR3WaitU(pUVCpu);
140	if (RT_FAILURE(rc))
141	{
142	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
143	break;
144	}
145	}
146	}
147	else
148	{
149	/*
150	* Pending requests which needs servicing?
151	*
152	* We check for state changes in addition to status codes when
153	* servicing requests. (Look after the ifs.)
154	*/
155	PVM pVM = pUVM->pVM;
156	PVMCPU pVCpu = pUVCpu->pVCpu;
157	enmBefore = pVM->enmVMState;
158	if (pUVM->vm.s.fTerminateEMT)
159	{
160	rc = VINF_EM_TERMINATE;
161	break;
162	}
163
164	if (VM_FF_IS_PENDING(pVM, VM_FF_EMT_RENDEZVOUS))
165	{
166	rc = VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
167	Log(("vmR3EmulationThread: Rendezvous rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
168	}
169	else if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
170	{
171	/*
172	* Service execute in any EMT request.
173	*/
174	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
175	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
176	}
177	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
178	{
179	/*
180	* Service execute in specific EMT request.
181	*/
182	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
183	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
184	}
185	else if ( VM_FF_IS_SET(pVM, VM_FF_DBGF)
186	\|\| VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_DBGF))
187	{
188	/*
189	* Service the debugger request.
190	*/
191	rc = DBGFR3VMMForcedAction(pVM, pVCpu);
192	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
193	}
194	else if (VM_FF_TEST_AND_CLEAR(pVM, VM_FF_RESET))
195	{
196	/*
197	* Service a delayed reset request.
198	*/
199	rc = VBOXSTRICTRC_VAL(VMR3ResetFF(pVM));
200	VM_FF_CLEAR(pVM, VM_FF_RESET);
201	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
202	}
203	else
204	{
205	/*
206	* Nothing important is pending, so wait for something.
207	*/
208	rc = VMR3WaitU(pUVCpu);
209	if (RT_FAILURE(rc))
210	{
211	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
212	break;
213	}
214	}
215
216	/*
217	* Check for termination requests, these have extremely high priority.
218	*/
219	if ( rc == VINF_EM_TERMINATE
220	\|\| pUVM->vm.s.fTerminateEMT)
221	break;
222	}
223
224	/*
225	* Some requests (both VMR3Req* and the DBGF) can potentially resume
226	* or start the VM, in that case we'll get a change in VM status
227	* indicating that we're now running.
228	*/
229	if ( RT_SUCCESS(rc)
230	&& pUVM->pVM)
231	{
232	PVM pVM = pUVM->pVM;
233	PVMCPU pVCpu = &pVM->aCpus[idCpu];
234	if ( pVM->enmVMState == VMSTATE_RUNNING
235	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
236	{
237	rc = EMR3ExecuteVM(pVM, pVCpu);
238	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
239	if (EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION)
240	vmR3SetGuruMeditation(pVM);
241	}
242	}
243
244	} /* forever */
245
246
247	/*
248	* Cleanup and exit.
249	*/
250	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
251	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
252	if ( idCpu == 0
253	&& pUVM->pVM)
254	{
255	PVM pVM = pUVM->pVM;
256	vmR3SetTerminated(pVM);
257	pUVM->pVM = NULL;
258
259	/** @todo SMP: This isn't 100% safe. We should wait for the other
260	* threads to finish before destroy the VM. */
261	int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, 0 /idCpu/, VMMR0_DO_GVMM_DESTROY_VM, 0, NULL);
262	AssertLogRelRC(rc2);
263	}
264
265	if ( pUVM->pVmm2UserMethods
266	&& pUVM->pVmm2UserMethods->pfnNotifyEmtTerm)
267	pUVM->pVmm2UserMethods->pfnNotifyEmtTerm(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
268
269	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
270	Log(("vmR3EmulationThread: EMT is terminated.\n"));
271	return rc;
272	}
273
274
275	/**
276	* Gets the name of a halt method.
277	*
278	* @returns Pointer to a read only string.
279	* @param enmMethod The method.
280	*/
281	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
282	{
283	switch (enmMethod)
284	{
285	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
286	case VMHALTMETHOD_DEFAULT: return "default";
287	case VMHALTMETHOD_OLD: return "old";
288	case VMHALTMETHOD_1: return "method1";
289	//case VMHALTMETHOD_2: return "method2";
290	case VMHALTMETHOD_GLOBAL_1: return "global1";
291	default: return "unknown";
292	}
293	}
294
295
296	/**
297	* Signal a fatal wait error.
298	*
299	* @returns Fatal error code to be propagated up the call stack.
300	* @param pUVCpu The user mode per CPU structure of the calling
301	* EMT.
302	* @param pszFmt The error format with a single %Rrc in it.
303	* @param rcFmt The status code to format.
304	*/
305	static int vmR3FatalWaitError(PUVMCPU pUVCpu, const char *pszFmt, int rcFmt)
306	{
307	/** @todo This is wrong ... raise a fatal error / guru meditation
308	* instead. */
309	AssertLogRelMsgFailed((pszFmt, rcFmt));
310	ASMAtomicUoWriteBool(&pUVCpu->pUVM->vm.s.fTerminateEMT, true);
311	if (pUVCpu->pVM)
312	VM_FF_SET(pUVCpu->pVM, VM_FF_CHECK_VM_STATE);
313	return VERR_VM_FATAL_WAIT_ERROR;
314	}
315
316
317	/**
318	* The old halt loop.
319	*/
320	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
321	{
322	/*
323	* Halt loop.
324	*/
325	PVM pVM = pUVCpu->pVM;
326	PVMCPU pVCpu = pUVCpu->pVCpu;
327
328	int rc = VINF_SUCCESS;
329	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
330	//unsigned cLoops = 0;
331	for (;;)
332	{
333	/*
334	* Work the timers and check if we can exit.
335	* The poll call gives us the ticks left to the next event in
336	* addition to perhaps set an FF.
337	*/
338	uint64_t const u64StartTimers = RTTimeNanoTS();
339	TMR3TimerQueuesDo(pVM);
340	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
341	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
342	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
343	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
344	break;
345	uint64_t u64NanoTS;
346	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
347	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
348	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
349	break;
350
351	/*
352	* Wait for a while. Someone will wake us up or interrupt the call if
353	* anything needs our attention.
354	*/
355	if (u64NanoTS < 50000)
356	{
357	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
358	/* spin */;
359	}
360	else
361	{
362	VMMR3YieldStop(pVM);
363	//uint64_t u64Start = RTTimeNanoTS();
364	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
365	{
366	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
367	uint64_t const u64StartSchedYield = RTTimeNanoTS();
368	RTThreadYield(); /* this is the best we can do here */
369	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
370	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
371	}
372	else if (u64NanoTS < 2000000)
373	{
374	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
375	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
376	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
377	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
378	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
379	}
380	else
381	{
382	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
383	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
384	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
385	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
386	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
387	}
388	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
389	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
390	}
391	if (rc == VERR_TIMEOUT)
392	rc = VINF_SUCCESS;
393	else if (RT_FAILURE(rc))
394	{
395	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
396	break;
397	}
398	}
399
400	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
401	return rc;
402	}
403
404
405	/**
406	* Initialize the configuration of halt method 1 & 2.
407	*
408	* @return VBox status code. Failure on invalid CFGM data.
409	* @param pUVM The user mode VM structure.
410	*/
411	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
412	{
413	/*
414	* The defaults.
415	*/
416	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
417	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
418	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
419	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
420	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
421	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
422	#else
423	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
424	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
425	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
426	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
427	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
428	#endif
429
430	/*
431	* Query overrides.
432	*
433	* I don't have time to bother with niceties such as invalid value checks
434	* here right now. sorry.
435	*/
436	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
437	if (pCfg)
438	{
439	uint32_t u32;
440	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
441	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
442	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
443	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
444	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
445	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
446	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
447	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
448	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
449	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
450	LogRel(("VMEmt: HaltedMethod1 config: %d/%d/%d/%d/%d\n",
451	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
452	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
453	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
454	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
455	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
456	}
457
458	return VINF_SUCCESS;
459	}
460
461
462	/**
463	* Initialize halt method 1.
464	*
465	* @return VBox status code.
466	* @param pUVM Pointer to the user mode VM structure.
467	*/
468	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
469	{
470	return vmR3HaltMethod12ReadConfigU(pUVM);
471	}
472
473
474	/**
475	* Method 1 - Block whenever possible, and when lagging behind
476	* switch to spinning for 10-30ms with occasional blocking until
477	* the lag has been eliminated.
478	*/
479	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
480	{
481	PUVM pUVM = pUVCpu->pUVM;
482	PVMCPU pVCpu = pUVCpu->pVCpu;
483	PVM pVM = pUVCpu->pVM;
484
485	/*
486	* To simplify things, we decide up-front whether we should switch to spinning or
487	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
488	* and that it will generate interrupts or other events that will cause us to exit
489	* the halt loop.
490	*/
491	bool fBlockOnce = false;
492	bool fSpinning = false;
493	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
494	if (u32CatchUpPct /* non-zero if catching up */)
495	{
496	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
497	{
498	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
499	if (fSpinning)
500	{
501	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
502	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
503	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
504	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
505	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
506	}
507	else
508	{
509	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
510	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
511	}
512	}
513	else
514	{
515	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
516	if (fSpinning)
517	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
518	}
519	}
520	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
521	{
522	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
523	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
524	}
525
526	/*
527	* Halt loop.
528	*/
529	int rc = VINF_SUCCESS;
530	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
531	unsigned cLoops = 0;
532	for (;; cLoops++)
533	{
534	/*
535	* Work the timers and check if we can exit.
536	*/
537	uint64_t const u64StartTimers = RTTimeNanoTS();
538	TMR3TimerQueuesDo(pVM);
539	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
540	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
541	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
542	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
543	break;
544
545	/*
546	* Estimate time left to the next event.
547	*/
548	uint64_t u64NanoTS;
549	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
550	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
551	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
552	break;
553
554	/*
555	* Block if we're not spinning and the interval isn't all that small.
556	*/
557	if ( ( !fSpinning
558	\|\| fBlockOnce)
559	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
560	&& u64NanoTS >= 100000) /* 0.100 ms */
561	#else
562	&& u64NanoTS >= 250000) /* 0.250 ms */
563	#endif
564	{
565	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
566	VMMR3YieldStop(pVM);
567
568	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
569	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
570	cMilliSecs = 1;
571	else
572	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
573
574	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
575	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
576	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
577	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
578	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
579
580	if (rc == VERR_TIMEOUT)
581	rc = VINF_SUCCESS;
582	else if (RT_FAILURE(rc))
583	{
584	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
585	break;
586	}
587
588	/*
589	* Calc the statistics.
590	* Update averages every 16th time, and flush parts of the history every 64th time.
591	*/
592	const uint64_t Elapsed = RTTimeNanoTS() - Start;
593	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
594	if (Elapsed > u64NanoTS)
595	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
596	pUVCpu->vm.s.Halt.Method12.cBlocks++;
597	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
598	{
599	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
600	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
601	{
602	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
603	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
604	}
605	}
606	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
607
608	/*
609	* Clear the block once flag if we actually blocked.
610	*/
611	if ( fBlockOnce
612	&& Elapsed > 100000 /* 0.1 ms */)
613	fBlockOnce = false;
614	}
615	}
616	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
617
618	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
619	return rc;
620	}
621
622
623	/**
624	* Initialize the global 1 halt method.
625	*
626	* @return VBox status code.
627	* @param pUVM Pointer to the user mode VM structure.
628	*/
629	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
630	{
631	/*
632	* The defaults.
633	*/
634	uint32_t cNsResolution = SUPSemEventMultiGetResolution(pUVM->vm.s.pSession);
635	if (cNsResolution > 5*RT_NS_100US)
636	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 50000;
637	else if (cNsResolution > RT_NS_100US)
638	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = cNsResolution / 4;
639	else
640	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 2000;
641
642	/*
643	* Query overrides.
644	*
645	* I don't have time to bother with niceties such as invalid value checks
646	* here right now. sorry.
647	*/
648	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedGlobal1");
649	if (pCfg)
650	{
651	uint32_t u32;
652	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "SpinBlockThreshold", &u32)))
653	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = u32;
654	}
655	LogRel(("VMEmt: HaltedGlobal1 config: cNsSpinBlockThresholdCfg=%u\n",
656	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg));
657	return VINF_SUCCESS;
658	}
659
660
661	/**
662	* The global 1 halt method - Block in GMM (ring-0) and let it
663	* try take care of the global scheduling of EMT threads.
664	*/
665	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
666	{
667	PUVM pUVM = pUVCpu->pUVM;
668	PVMCPU pVCpu = pUVCpu->pVCpu;
669	PVM pVM = pUVCpu->pVM;
670	Assert(VMMGetCpu(pVM) == pVCpu);
671	NOREF(u64Now);
672
673	/*
674	* Halt loop.
675	*/
676	//uint64_t u64NowLog, u64Start;
677	//u64Start = u64NowLog = RTTimeNanoTS();
678	int rc = VINF_SUCCESS;
679	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
680	unsigned cLoops = 0;
681	for (;; cLoops++)
682	{
683	/*
684	* Work the timers and check if we can exit.
685	*/
686	uint64_t const u64StartTimers = RTTimeNanoTS();
687	TMR3TimerQueuesDo(pVM);
688	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
689	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
690	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
691	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
692	break;
693
694	/*
695	* Estimate time left to the next event.
696	*/
697	//u64NowLog = RTTimeNanoTS();
698	uint64_t u64Delta;
699	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
700	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
701	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
702	break;
703
704	/*
705	* Block if we're not spinning and the interval isn't all that small.
706	*/
707	if (u64Delta >= pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg)
708	{
709	VMMR3YieldStop(pVM);
710	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
711	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
712	break;
713
714	//RTLogPrintf("loop=%-3d u64GipTime=%'llu / %'llu now=%'llu / %'llu\n", cLoops, u64GipTime, u64Delta, u64NowLog, u64GipTime - u64NowLog);
715	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
716	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
717	uint64_t const u64EndSchedHalt = RTTimeNanoTS();
718	uint64_t const cNsElapsedSchedHalt = u64EndSchedHalt - u64StartSchedHalt;
719	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
720
721	if (rc == VERR_INTERRUPTED)
722	rc = VINF_SUCCESS;
723	else if (RT_FAILURE(rc))
724	{
725	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Halt: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
726	break;
727	}
728	else
729	{
730	int64_t const cNsOverslept = u64EndSchedHalt - u64GipTime;
731	if (cNsOverslept > 50000)
732	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOverslept, cNsOverslept);
733	else if (cNsOverslept < -50000)
734	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockInsomnia, cNsElapsedSchedHalt);
735	else
736	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOnTime, cNsElapsedSchedHalt);
737	}
738	}
739	/*
740	* When spinning call upon the GVMM and do some wakups once
741	* in a while, it's not like we're actually busy or anything.
742	*/
743	else if (!(cLoops & 0x1fff))
744	{
745	uint64_t const u64StartSchedYield = RTTimeNanoTS();
746	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
747	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
748	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
749	}
750	}
751	//RTLogPrintf("*** %u loops %'llu; lag=%RU64\n", cLoops, u64NowLog - u64Start, TMVirtualSyncGetLag(pVM));
752
753	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
754	return rc;
755	}
756
757
758	/**
759	* The global 1 halt method - VMR3Wait() worker.
760	*
761	* @returns VBox status code.
762	* @param pUVCpu Pointer to the user mode VMCPU structure.
763	*/
764	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
765	{
766	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
767
768	PVM pVM = pUVCpu->pUVM->pVM;
769	PVMCPU pVCpu = VMMGetCpu(pVM);
770	Assert(pVCpu->idCpu == pUVCpu->idCpu);
771
772	int rc = VINF_SUCCESS;
773	for (;;)
774	{
775	/*
776	* Check Relevant FFs.
777	*/
778	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
779	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
780	break;
781
782	/*
783	* Wait for a while. Someone will wake us up or interrupt the call if
784	* anything needs our attention.
785	*/
786	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
787	if (rc == VERR_INTERRUPTED)
788	rc = VINF_SUCCESS;
789	else if (RT_FAILURE(rc))
790	{
791	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Wait: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
792	break;
793	}
794	}
795
796	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
797	return rc;
798	}
799
800
801	/**
802	* The global 1 halt method - VMR3NotifyFF() worker.
803	*
804	* @param pUVCpu Pointer to the user mode VMCPU structure.
805	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
806	*/
807	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
808	{
809	if (pUVCpu->vm.s.fWait)
810	{
811	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
812	AssertRC(rc);
813	}
814	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
815	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
816	&& pUVCpu->pVCpu)
817	{
818	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
819	if (enmState == VMCPUSTATE_STARTED_EXEC)
820	{
821	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
822	{
823	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
824	AssertRC(rc);
825	}
826	}
827	#ifdef VBOX_WITH_REM
828	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
829	{
830	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
831	REMR3NotifyFF(pUVCpu->pVM);
832	}
833	#endif
834	}
835	}
836
837
838	/**
839	* Bootstrap VMR3Wait() worker.
840	*
841	* @returns VBox status code.
842	* @param pUVCpu Pointer to the user mode VMCPU structure.
843	*/
844	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
845	{
846	PUVM pUVM = pUVCpu->pUVM;
847
848	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
849
850	int rc = VINF_SUCCESS;
851	for (;;)
852	{
853	/*
854	* Check Relevant FFs.
855	*/
856	if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs) /* global requests pending? */
857	break;
858	if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs) /* local requests pending? */
859	break;
860
861	if ( pUVCpu->pVM
862	&& ( VM_FF_IS_PENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
863	\|\| VMCPU_FF_IS_PENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
864	)
865	)
866	break;
867	if (pUVM->vm.s.fTerminateEMT)
868	break;
869
870	/*
871	* Wait for a while. Someone will wake us up or interrupt the call if
872	* anything needs our attention.
873	*/
874	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
875	if (rc == VERR_TIMEOUT)
876	rc = VINF_SUCCESS;
877	else if (RT_FAILURE(rc))
878	{
879	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
880	break;
881	}
882	}
883
884	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
885	return rc;
886	}
887
888
889	/**
890	* Bootstrap VMR3NotifyFF() worker.
891	*
892	* @param pUVCpu Pointer to the user mode VMCPU structure.
893	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
894	*/
895	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
896	{
897	if (pUVCpu->vm.s.fWait)
898	{
899	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
900	AssertRC(rc);
901	}
902	NOREF(fFlags);
903	}
904
905
906	/**
907	* Default VMR3Wait() worker.
908	*
909	* @returns VBox status code.
910	* @param pUVCpu Pointer to the user mode VMCPU structure.
911	*/
912	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
913	{
914	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
915
916	PVM pVM = pUVCpu->pVM;
917	PVMCPU pVCpu = pUVCpu->pVCpu;
918	int rc = VINF_SUCCESS;
919	for (;;)
920	{
921	/*
922	* Check Relevant FFs.
923	*/
924	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
925	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
926	break;
927
928	/*
929	* Wait for a while. Someone will wake us up or interrupt the call if
930	* anything needs our attention.
931	*/
932	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
933	if (rc == VERR_TIMEOUT)
934	rc = VINF_SUCCESS;
935	else if (RT_FAILURE(rc))
936	{
937	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc", rc);
938	break;
939	}
940	}
941
942	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
943	return rc;
944	}
945
946
947	/**
948	* Default VMR3NotifyFF() worker.
949	*
950	* @param pUVCpu Pointer to the user mode VMCPU structure.
951	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
952	*/
953	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
954	{
955	if (pUVCpu->vm.s.fWait)
956	{
957	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
958	AssertRC(rc);
959	}
960	#ifdef VBOX_WITH_REM
961	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
962	&& pUVCpu->pVCpu
963	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
964	REMR3NotifyFF(pUVCpu->pVM);
965	#endif
966	}
967
968
969	/**
970	* Array with halt method descriptors.
971	* VMINT::iHaltMethod contains an index into this array.
972	*/
973	static const struct VMHALTMETHODDESC
974	{
975	/** The halt method id. */
976	VMHALTMETHOD enmHaltMethod;
977	/** The init function for loading config and initialize variables. */
978	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
979	/** The term function. */
980	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
981	/** The VMR3WaitHaltedU function. */
982	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
983	/** The VMR3WaitU function. */
984	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
985	/** The VMR3NotifyCpuFFU function. */
986	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
987	/** The VMR3NotifyGlobalFFU function. */
988	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
989	} g_aHaltMethods[] =
990	{
991	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
992	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
993	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
994	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
995	};
996
997
998	/**
999	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1000	*
1001	* This function is called by thread other than EMT to make
1002	* sure EMT wakes up and promptly service an FF request.
1003	*
1004	* @param pUVM Pointer to the user mode VM structure.
1005	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1006	* @internal
1007	*/
1008	VMMR3_INT_DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
1009	{
1010	LogFlow(("VMR3NotifyGlobalFFU:\n"));
1011	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
1012
1013	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
1014	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
1015	else
1016	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
1017	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
1018	}
1019
1020
1021	/**
1022	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1023	*
1024	* This function is called by thread other than EMT to make
1025	* sure EMT wakes up and promptly service an FF request.
1026	*
1027	* @param pUVCpu Pointer to the user mode per CPU VM structure.
1028	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1029	* @internal
1030	*/
1031	VMMR3_INT_DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
1032	{
1033	PUVM pUVM = pUVCpu->pUVM;
1034
1035	LogFlow(("VMR3NotifyCpuFFU:\n"));
1036	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
1037	}
1038
1039
1040	/**
1041	* Halted VM Wait.
1042	* Any external event will unblock the thread.
1043	*
1044	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1045	* case an appropriate status code is returned.
1046	* @param pVM The cross context VM structure.
1047	* @param pVCpu The cross context virtual CPU structure.
1048	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
1049	* @thread The emulation thread.
1050	* @remarks Made visible for implementing vmsvga sync register.
1051	* @internal
1052	*/
1053	VMMR3_INT_DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
1054	{
1055	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
1056
1057	/*
1058	* Check Relevant FFs.
1059	*/
1060	const uint32_t fMask = !fIgnoreInterrupts
1061	? VMCPU_FF_EXTERNAL_HALTED_MASK
1062	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_UPDATE_APIC \| VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
1063	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1064	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
1065	{
1066	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1067	return VINF_SUCCESS;
1068	}
1069
1070	/*
1071	* The yielder is suspended while we're halting, while TM might have clock(s) running
1072	* only at certain times and need to be notified..
1073	*/
1074	if (pVCpu->idCpu == 0)
1075	VMMR3YieldSuspend(pVM);
1076	TMNotifyStartOfHalt(pVCpu);
1077
1078	/*
1079	* Record halt averages for the last second.
1080	*/
1081	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1082	uint64_t u64Now = RTTimeNanoTS();
1083	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1084	if (off > 1000000000)
1085	{
1086	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1087	{
1088	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1089	pUVCpu->vm.s.HaltFrequency = 1;
1090	}
1091	else
1092	{
1093	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1094	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1095	}
1096	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1097	pUVCpu->vm.s.cHalts = 0;
1098	}
1099	pUVCpu->vm.s.cHalts++;
1100
1101	/*
1102	* Do the halt.
1103	*/
1104	VMCPU_ASSERT_STATE(pVCpu, VMCPUSTATE_STARTED);
1105	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1106	PUVM pUVM = pUVCpu->pUVM;
1107	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1108	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1109
1110	/*
1111	* Notify TM and resume the yielder
1112	*/
1113	TMNotifyEndOfHalt(pVCpu);
1114	if (pVCpu->idCpu == 0)
1115	VMMR3YieldResume(pVM);
1116
1117	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1118	return rc;
1119	}
1120
1121
1122	/**
1123	* Suspended VM Wait.
1124	* Only a handful of forced actions will cause the function to
1125	* return to the caller.
1126	*
1127	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1128	* case an appropriate status code is returned.
1129	* @param pUVCpu Pointer to the user mode VMCPU structure.
1130	* @thread The emulation thread.
1131	* @internal
1132	*/
1133	VMMR3_INT_DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1134	{
1135	LogFlow(("VMR3WaitU:\n"));
1136
1137	/*
1138	* Check Relevant FFs.
1139	*/
1140	PVM pVM = pUVCpu->pVM;
1141	PVMCPU pVCpu = pUVCpu->pVCpu;
1142
1143	if ( pVM
1144	&& ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1145	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1146	)
1147	)
1148	{
1149	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1150	return VINF_SUCCESS;
1151	}
1152
1153	/*
1154	* Do waiting according to the halt method (so VMR3NotifyFF
1155	* doesn't have to special case anything).
1156	*/
1157	PUVM pUVM = pUVCpu->pUVM;
1158	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1159	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pUVM->pVM ? pUVM->pVM->fGlobalForcedActions : 0));
1160	return rc;
1161	}
1162
1163
1164	/**
1165	* Interface that PDMR3Suspend, PDMR3PowerOff and PDMR3Reset uses when they wait
1166	* for the handling of asynchronous notifications to complete.
1167	*
1168	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1169	* case an appropriate status code is returned.
1170	* @param pUVCpu Pointer to the user mode VMCPU structure.
1171	* @thread The emulation thread.
1172	*/
1173	VMMR3_INT_DECL(int) VMR3AsyncPdmNotificationWaitU(PUVMCPU pUVCpu)
1174	{
1175	LogFlow(("VMR3AsyncPdmNotificationWaitU:\n"));
1176	return VMR3WaitU(pUVCpu);
1177	}
1178
1179
1180	/**
1181	* Interface that PDM the helper asynchronous notification completed methods
1182	* uses for EMT0 when it is waiting inside VMR3AsyncPdmNotificationWaitU().
1183	*
1184	* @param pUVM Pointer to the user mode VM structure.
1185	*/
1186	VMMR3_INT_DECL(void) VMR3AsyncPdmNotificationWakeupU(PUVM pUVM)
1187	{
1188	LogFlow(("VMR3AsyncPdmNotificationWakeupU:\n"));
1189	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST); /* this will have to do for now. */
1190	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(&pUVM->aCpus[0], 0 /fFlags/);
1191	}
1192
1193
1194	/**
1195	* Rendezvous callback that will be called once.
1196	*
1197	* @returns VBox strict status code.
1198	* @param pVM The cross context VM structure.
1199	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
1200	* @param pvUser The new g_aHaltMethods index.
1201	*/
1202	static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1203	{
1204	PUVM pUVM = pVM->pUVM;
1205	uintptr_t i = (uintptr_t)pvUser;
1206	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1207	NOREF(pVCpu);
1208
1209	/*
1210	* Terminate the old one.
1211	*/
1212	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1213	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1214	{
1215	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1216	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1217	}
1218
1219	/* Assert that the failure fallback is where we expect. */
1220	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1221	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1222
1223	/*
1224	* Init the new one.
1225	*/
1226	int rc = VINF_SUCCESS;
1227	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1228	if (g_aHaltMethods[i].pfnInit)
1229	{
1230	rc = g_aHaltMethods[i].pfnInit(pUVM);
1231	if (RT_FAILURE(rc))
1232	{
1233	/* Fall back on the bootstrap method. This requires no
1234	init/term (see assertion above), and will always work. */
1235	AssertLogRelRC(rc);
1236	i = 0;
1237	}
1238	}
1239
1240	/*
1241	* Commit it.
1242	*/
1243	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1244	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1245
1246	return rc;
1247	}
1248
1249
1250	/**
1251	* Changes the halt method.
1252	*
1253	* @returns VBox status code.
1254	* @param pUVM Pointer to the user mode VM structure.
1255	* @param enmHaltMethod The new halt method.
1256	* @thread EMT.
1257	*/
1258	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1259	{
1260	PVM pVM = pUVM->pVM; Assert(pVM);
1261	VM_ASSERT_EMT(pVM);
1262	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1263
1264	/*
1265	* Resolve default (can be overridden in the configuration).
1266	*/
1267	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1268	{
1269	uint32_t u32;
1270	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1271	if (RT_SUCCESS(rc))
1272	{
1273	enmHaltMethod = (VMHALTMETHOD)u32;
1274	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1275	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1276	}
1277	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1278	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1279	else
1280	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1281	//enmHaltMethod = VMHALTMETHOD_1;
1282	//enmHaltMethod = VMHALTMETHOD_OLD;
1283	}
1284	LogRel(("VMEmt: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1285
1286	/*
1287	* Find the descriptor.
1288	*/
1289	unsigned i = 0;
1290	while ( i < RT_ELEMENTS(g_aHaltMethods)
1291	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1292	i++;
1293	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1294
1295	/*
1296	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1297	*/
1298	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1299	}
1300
1301
1302	/**
1303	* Special interface for implementing a HLT-like port on a device.
1304	*
1305	* This can be called directly from device code, provide the device is trusted
1306	* to access the VMM directly. Since we may not have an accurate register set
1307	* and the caller certainly shouldn't (device code does not access CPU
1308	* registers), this function will return when interrupts are pending regardless
1309	* of the actual EFLAGS.IF state.
1310	*
1311	* @returns VBox error status (never informational statuses).
1312	* @param pVM The cross context VM structure.
1313	* @param idCpu The id of the calling EMT.
1314	*/
1315	VMMR3DECL(int) VMR3WaitForDeviceReady(PVM pVM, VMCPUID idCpu)
1316	{
1317	/*
1318	* Validate caller and resolve the CPU ID.
1319	*/
1320	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1321	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1322	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1323	VMCPU_ASSERT_EMT_RETURN(pVCpu, VERR_VM_THREAD_NOT_EMT);
1324
1325	/*
1326	* Tag along with the HLT mechanics for now.
1327	*/
1328	int rc = VMR3WaitHalted(pVM, pVCpu, false /fIgnoreInterrupts/);
1329	if (RT_SUCCESS(rc))
1330	return VINF_SUCCESS;
1331	return rc;
1332	}
1333
1334
1335	/**
1336	* Wakes up a CPU that has called VMR3WaitForDeviceReady.
1337	*
1338	* @returns VBox error status (never informational statuses).
1339	* @param pVM The cross context VM structure.
1340	* @param idCpu The id of the calling EMT.
1341	*/
1342	VMMR3DECL(int) VMR3NotifyCpuDeviceReady(PVM pVM, VMCPUID idCpu)
1343	{
1344	/*
1345	* Validate caller and resolve the CPU ID.
1346	*/
1347	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1348	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1349	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1350
1351	/*
1352	* Pretend it was an FF that got set since we've got logic for that already.
1353	*/
1354	VMR3NotifyCpuFFU(pVCpu->pUVCpu, VMNOTIFYFF_FLAGS_DONE_REM);
1355	return VINF_SUCCESS;
1356	}
1357

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source: vbox/trunk/src/VBox/VMM/VMMR3/VMEmt.cpp@ 61628

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