VMEmt.cpp@ 2482

Last change on this file since 2482 was 2284, checked in by vboxsync, 18 years ago
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1	/* $Id: VMEmt.cpp 2284 2007-04-20 22:30:56Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
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/pdm.h>
31	#include <VBox/rem.h>
32	#include "VMInternal.h"
33	#include <VBox/vm.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/semaphore.h>
40	#include <iprt/thread.h>
41	#include <iprt/time.h>
42
43
44
45	/**
46	* The emulation thread.
47	*
48	* @returns Thread exit code.
49	* @param ThreadSelf The handle to the executing thread.
50	* @param pvArgs Pointer to a VMEMULATIONTHREADARGS structure.
51	*/
52	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
53	{
54	PVMEMULATIONTHREADARGS pArgs = (PVMEMULATIONTHREADARGS)pvArgs;
55	AssertReleaseMsg(pArgs && pArgs->pVM, ("Invalid arguments to the emulation thread!\n"));
56
57	/*
58	* Init the native thread member.
59	*/
60	PVM pVM = pArgs->pVM;
61	pVM->NativeThreadEMT = RTThreadGetNative(ThreadSelf);
62
63	/*
64	* The request loop.
65	*/
66	VMSTATE enmBefore;
67	int rc;
68	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pVM=%p\n", ThreadSelf, pVM));
69	for (;;)
70	{
71	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
72	if (setjmp(pVM->vm.s.emtJumpEnv) != 0)
73	{
74	rc = VINF_SUCCESS;
75	break;
76	}
77
78	/*
79	* Pending requests which needs servicing?
80	*
81	* We check for state changes in addition to status codes when
82	* servicing requests. (Look after the ifs.)
83	*/
84	enmBefore = pVM->enmVMState;
85	if (VM_FF_ISSET(pVM, VM_FF_TERMINATE))
86	{
87	rc = VINF_EM_TERMINATE;
88	break;
89	}
90	else if (pVM->vm.s.pReqs)
91	{
92	/*
93	* Service execute in EMT request.
94	*/
95	rc = VMR3ReqProcess(pVM);
96	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
97	}
98	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
99	{
100	/*
101	* Service the debugger request.
102	*/
103	rc = DBGFR3VMMForcedAction(pVM);
104	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
105	}
106	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
107	{
108	/*
109	* Service a delay reset request.
110	*/
111	rc = VMR3Reset(pVM);
112	VM_FF_CLEAR(pVM, VM_FF_RESET);
113	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
114	}
115	else
116	{
117	/*
118	* Nothing important is pending, so wait for something.
119	*/
120	rc = VMR3Wait(pVM);
121	if (VBOX_FAILURE(rc))
122	break;
123	}
124
125	/*
126	* Check for termination requests, these are extremely high priority.
127	*/
128	if ( rc == VINF_EM_TERMINATE
129	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE))
130	break;
131
132	/*
133	* Some requests (both VMR3Req* and the DBGF) can potentially
134	* resume or start the VM, in that case we'll get a change in
135	* VM status indicating that we're now running.
136	*/
137	if ( VBOX_SUCCESS(rc)
138	&& enmBefore != pVM->enmVMState
139	&& (pVM->enmVMState == VMSTATE_RUNNING))
140	{
141	rc = EMR3ExecuteVM(pVM);
142	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Vrc, enmVMState=%d\n", rc, pVM->enmVMState));
143	}
144
145	} /* forever */
146
147
148	/*
149	* Exiting.
150	*/
151	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
152	ThreadSelf, pVM, rc, enmBefore, pVM->enmVMState));
153	if (pVM->vm.s.fEMTDoesTheCleanup)
154	{
155	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
156	vmR3Destroy(pVM);
157	vmR3DestroyFinalBit(pVM);
158	Log(("vmR3EmulationThread: EMT is terminated.\n"));
159	}
160	else
161	{
162	/* we don't reset ThreadEMT here because it's used in waiting. */
163	pVM->NativeThreadEMT = NIL_RTNATIVETHREAD;
164	}
165	return rc;
166	}
167
168	/**
169	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
170	* In case the VM is stopped, clean up and long jump to the main EMT loop.
171	*
172	* @returns VINF_SUCCESS or doesn't return
173	* @param pVM VM handle.
174	*/
175	VMR3DECL(int) VMR3WaitForResume(PVM pVM)
176	{
177	/*
178	* The request loop.
179	*/
180	VMSTATE enmBefore;
181	int rc;
182	for (;;)
183	{
184
185	/*
186	* Pending requests which needs servicing?
187	*
188	* We check for state changes in addition to status codes when
189	* servicing requests. (Look after the ifs.)
190	*/
191	enmBefore = pVM->enmVMState;
192	if (VM_FF_ISSET(pVM, VM_FF_TERMINATE))
193	{
194	rc = VINF_EM_TERMINATE;
195	break;
196	}
197	else if (pVM->vm.s.pReqs)
198	{
199	/*
200	* Service execute in EMT request.
201	*/
202	rc = VMR3ReqProcess(pVM);
203	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
204	}
205	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
206	{
207	/*
208	* Service the debugger request.
209	*/
210	rc = DBGFR3VMMForcedAction(pVM);
211	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
212	}
213	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
214	{
215	/*
216	* Service a delay reset request.
217	*/
218	rc = VMR3Reset(pVM);
219	VM_FF_CLEAR(pVM, VM_FF_RESET);
220	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
221	}
222	else
223	{
224	/*
225	* Nothing important is pending, so wait for something.
226	*/
227	rc = VMR3Wait(pVM);
228	if (VBOX_FAILURE(rc))
229	break;
230	}
231
232	/*
233	* Check for termination requests, these are extremely high priority.
234	*/
235	if ( rc == VINF_EM_TERMINATE
236	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE))
237	break;
238
239	/*
240	* Some requests (both VMR3Req* and the DBGF) can potentially
241	* resume or start the VM, in that case we'll get a change in
242	* VM status indicating that we're now running.
243	*/
244	if ( VBOX_SUCCESS(rc)
245	&& enmBefore != pVM->enmVMState
246	&& (pVM->enmVMState == VMSTATE_RUNNING))
247	{
248	/* Only valid exit reason. */
249	return VINF_SUCCESS;
250	}
251
252	} /* forever */
253
254	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
255	longjmp(pVM->vm.s.emtJumpEnv, 1);
256	}
257
258	/**
259	* Notify the emulation thread (EMT) about pending Forced Action (FF).
260	*
261	* This function is called by thread other than EMT to make
262	* sure EMT wakes up and promptly service an FF request.
263	*
264	* @param pVM VM handle.
265	* @param fNotifiedREM Set if REM have already been notified. If clear the
266	* generic REMR3NotifyFF() method is called.
267	*/
268	VMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
269	{
270	LogFlow(("VMR3NotifyFF:\n"));
271	if (pVM->vm.s.fWait)
272	{
273	int rc = RTSemEventSignal(pVM->vm.s.EventSemWait);
274	AssertRC(rc);
275	}
276	else if (!fNotifiedREM)
277	REMR3NotifyFF(pVM);
278	}
279
280
281	/**
282	* Halted VM Wait.
283	* Any external event will unblock the thread.
284	*
285	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
286	* case an appropriate status code is returned.
287	* @param pVM VM handle.
288	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
289	* @thread The emulation thread.
290	*/
291	VMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
292	{
293	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
294
295	/*
296	* Check Relevant FFs.
297	*/
298	const uint32_t fMask = !fIgnoreInterrupts
299	? VM_FF_EXTERNAL_HALTED_MASK
300	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
301	if (VM_FF_ISPENDING(pVM, fMask))
302	{
303	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
304	return VINF_SUCCESS;
305	}
306
307	/*
308	* The CPU TSC is running while halted,
309	* and the yielder is suspended.
310	*/
311	VMMR3YieldSuspend(pVM);
312
313	/*
314	* Halt loop.
315	*/
316	int rc = VINF_SUCCESS;
317	ASMAtomicXchgU32(&pVM->vm.s.fWait, 1);
318	//unsigned cLoops = 0;
319	for (;;)
320	{
321	/*
322	* Work the timers and check if we can exit.
323	* The poll call gives us the ticks left to the next event in
324	* addition to perhaps set an FF.
325	*/
326	STAM_PROFILE_ADV_START(&pVM->vm.s.StatHaltPoll, a);
327	PDMR3Poll(pVM);
328	STAM_PROFILE_ADV_STOP(&pVM->vm.s.StatHaltPoll, a);
329	STAM_PROFILE_ADV_START(&pVM->vm.s.StatHaltTimers, b);
330	TMR3TimerQueuesDo(pVM);
331	STAM_PROFILE_ADV_STOP(&pVM->vm.s.StatHaltTimers, b);
332	if (VM_FF_ISPENDING(pVM, fMask))
333	break;
334	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
335	if (VM_FF_ISPENDING(pVM, fMask))
336	break;
337
338	/*
339	* Wait for a while. Someone will wake us up or interrupt the call if
340	* anything needs our attention.
341	*/
342	if (u64NanoTS < 50000)
343	{
344	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
345	/* spin */;
346	}
347	else
348	{
349	VMMR3YieldStop(pVM);
350	//uint64_t u64Start = RTTimeNanoTS();
351	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
352	{
353	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
354	STAM_PROFILE_ADV_START(&pVM->vm.s.StatHaltYield, a);
355	RTThreadYield(); /* this is the best we can do here */
356	STAM_PROFILE_ADV_STOP(&pVM->vm.s.StatHaltYield, a);
357	}
358	else if (u64NanoTS < 2000000)
359	{
360	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
361	STAM_PROFILE_ADV_START(&pVM->vm.s.StatHaltBlock, a);
362	rc = RTSemEventWait(pVM->vm.s.EventSemWait, 1);
363	STAM_PROFILE_ADV_STOP(&pVM->vm.s.StatHaltBlock, a);
364	}
365	else
366	{
367	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
368	STAM_PROFILE_ADV_START(&pVM->vm.s.StatHaltBlock, a);
369	rc = RTSemEventWait(pVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
370	STAM_PROFILE_ADV_STOP(&pVM->vm.s.StatHaltBlock, a);
371	}
372	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
373	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
374	}
375	if (rc == VERR_TIMEOUT)
376	rc = VINF_SUCCESS;
377	else if (VBOX_FAILURE(rc))
378	{
379	AssertRC(rc != VERR_INTERRUPTED);
380	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
381	VM_FF_SET(pVM, VM_FF_TERMINATE);
382	rc = VERR_INTERNAL_ERROR;
383	break;
384	}
385	}
386	ASMAtomicXchgU32(&pVM->vm.s.fWait, 0);
387
388	/*
389	*
390	* Pause the TSC, it's restarted when we start executing,
391	* and resume the yielder.
392	*/
393	VMMR3YieldResume(pVM);
394
395
396	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions ));
397	return rc;
398	}
399
400
401	/**
402	* Suspended VM Wait.
403	* Only a handful of forced actions will cause the function to
404	* return to the caller.
405	*
406	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
407	* case an appropriate status code is returned.
408	* @param pVM VM handle.
409	* @thread The emulation thread.
410	*/
411	VMR3DECL(int) VMR3Wait(PVM pVM)
412	{
413	LogFlow(("VMR3Wait:\n"));
414
415	/*
416	* Check Relevant FFs.
417	*/
418	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
419	{
420	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
421	return VINF_SUCCESS;
422	}
423
424	int rc = VINF_SUCCESS;
425	ASMAtomicXchgU32(&pVM->vm.s.fWait, 1);
426	for (;;)
427	{
428	/*
429	* Check Relevant FFs.
430	*/
431	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
432	break;
433
434	/*
435	* Wait for a while. Someone will wake us up or interrupt the call if
436	* anything needs our attention.
437	*/
438	rc = RTSemEventWait(pVM->vm.s.EventSemWait, 1000);
439	if (rc == VERR_TIMEOUT)
440	rc = VINF_SUCCESS;
441	else if (VBOX_FAILURE(rc))
442	{
443	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
444	VM_FF_SET(pVM, VM_FF_TERMINATE);
445	rc = VERR_INTERNAL_ERROR;
446	break;
447	}
448
449	}
450	ASMAtomicXchgU32(&pVM->vm.s.fWait, 0);
451
452	LogFlow(("VMR3Wait: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
453	return rc;
454	}
455

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 2482

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