GVMMR0.cpp@ 41309

Last change on this file since 41309 was 41069, checked in by vboxsync, 13 years ago
GMMR0,memobj-r0drv-darwin.cpp: Moved the allocate fudge factor from GMMR0 to the darwin code. Mystery still unsolved, thought to be related to various panics as well.
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File size: 86.9 KB

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1	/* $Id: GVMMR0.cpp 41069 2012-04-26 12:01:00Z vboxsync $ */
2	/** @file
3	* GVMM - Global VM Manager.
4	*/
5
6	/*
7	* Copyright (C) 2007-2010 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	/** @page pg_gvmm GVMM - The Global VM Manager
20	*
21	* The Global VM Manager lives in ring-0. Its main function at the moment is
22	* to manage a list of all running VMs, keep a ring-0 only structure (GVM) for
23	* each of them, and assign them unique identifiers (so GMM can track page
24	* owners). The GVMM also manage some of the host CPU resources, like the the
25	* periodic preemption timer.
26	*
27	* The GVMM will create a ring-0 object for each VM when it is registered, this
28	* is both for session cleanup purposes and for having a point where it is
29	* possible to implement usage polices later (in SUPR0ObjRegister).
30	*
31	*
32	* @section sec_gvmm_ppt Periodic Preemption Timer (PPT)
33	*
34	* On system that sports a high resolution kernel timer API, we use per-cpu
35	* timers to generate interrupts that preempts VT-x, AMD-V and raw-mode guest
36	* execution. The timer frequency is calculating by taking the max
37	* TMCalcHostTimerFrequency for all VMs running on a CPU for the last ~160 ms
38	* (RT_ELEMENTS((PGVMMHOSTCPU)0, Ppt.aHzHistory) *
39	* GVMMHOSTCPU_PPT_HIST_INTERVAL_NS).
40	*
41	* The TMCalcHostTimerFrequency() part of the things gets its takes the max
42	* TMTimerSetFrequencyHint() value and adjusts by the current catch-up percent,
43	* warp drive percent and some fudge factors. VMMR0.cpp reports the result via
44	* GVMMR0SchedUpdatePeriodicPreemptionTimer() before switching to the VT-x,
45	* AMD-V and raw-mode execution environments.
46	*/
47
48
49	/*******************************************************************************
50	* Header Files *
51	*******************************************************************************/
52	#define LOG_GROUP LOG_GROUP_GVMM
53	#include <VBox/vmm/gvmm.h>
54	#include <VBox/vmm/gmm.h>
55	#include "GVMMR0Internal.h"
56	#include <VBox/vmm/gvm.h>
57	#include <VBox/vmm/vm.h>
58	#include <VBox/vmm/vmcpuset.h>
59	#include <VBox/vmm/vmm.h>
60	#include <VBox/param.h>
61	#include <VBox/err.h>
62
63	#include <iprt/asm.h>
64	#include <iprt/asm-amd64-x86.h>
65	#include <iprt/mem.h>
66	#include <iprt/semaphore.h>
67	#include <iprt/time.h>
68	#include <VBox/log.h>
69	#include <iprt/thread.h>
70	#include <iprt/process.h>
71	#include <iprt/param.h>
72	#include <iprt/string.h>
73	#include <iprt/assert.h>
74	#include <iprt/mem.h>
75	#include <iprt/memobj.h>
76	#include <iprt/mp.h>
77	#include <iprt/cpuset.h>
78	#include <iprt/spinlock.h>
79	#include <iprt/timer.h>
80
81	#include "dtrace/VBoxVMM.h"
82
83
84	/*******************************************************************************
85	* Defined Constants And Macros *
86	*******************************************************************************/
87	#if defined(RT_OS_LINUX) \|\| defined(DOXYGEN_RUNNING)
88	/** Define this to enable the periodic preemption timer. */
89	# define GVMM_SCHED_WITH_PPT
90	#endif
91
92
93	/*******************************************************************************
94	* Structures and Typedefs *
95	*******************************************************************************/
96
97	/**
98	* Global VM handle.
99	*/
100	typedef struct GVMHANDLE
101	{
102	/** The index of the next handle in the list (free or used). (0 is nil.) */
103	uint16_t volatile iNext;
104	/** Our own index / handle value. */
105	uint16_t iSelf;
106	/** The process ID of the handle owner.
107	* This is used for access checks. */
108	RTPROCESS ProcId;
109	/** The pointer to the ring-0 only (aka global) VM structure. */
110	PGVM pGVM;
111	/** The ring-0 mapping of the shared VM instance data. */
112	PVM pVM;
113	/** The virtual machine object. */
114	void *pvObj;
115	/** The session this VM is associated with. */
116	PSUPDRVSESSION pSession;
117	/** The ring-0 handle of the EMT0 thread.
118	* This is used for ownership checks as well as looking up a VM handle by thread
119	* at times like assertions. */
120	RTNATIVETHREAD hEMT0;
121	} GVMHANDLE;
122	/** Pointer to a global VM handle. */
123	typedef GVMHANDLE *PGVMHANDLE;
124
125	/** Number of GVM handles (including the NIL handle). */
126	#if HC_ARCH_BITS == 64
127	# define GVMM_MAX_HANDLES 8192
128	#else
129	# define GVMM_MAX_HANDLES 128
130	#endif
131
132	/**
133	* Per host CPU GVMM data.
134	*/
135	typedef struct GVMMHOSTCPU
136	{
137	/** Magic number (GVMMHOSTCPU_MAGIC). */
138	uint32_t volatile u32Magic;
139	/** The CPU ID. */
140	RTCPUID idCpu;
141	/** The CPU set index. */
142	uint32_t idxCpuSet;
143
144	#ifdef GVMM_SCHED_WITH_PPT
145	/** Periodic preemption timer data. */
146	struct
147	{
148	/** The handle to the periodic preemption timer. */
149	PRTTIMER pTimer;
150	/** Spinlock protecting the data below. */
151	RTSPINLOCK hSpinlock;
152	/** The smalles Hz that we need to care about. (static) */
153	uint32_t uMinHz;
154	/** The number of ticks between each historization. */
155	uint32_t cTicksHistoriziationInterval;
156	/** The current historization tick (counting up to
157	* cTicksHistoriziationInterval and then resetting). */
158	uint32_t iTickHistorization;
159	/** The current timer interval. This is set to 0 when inactive. */
160	uint32_t cNsInterval;
161	/** The current timer frequency. This is set to 0 when inactive. */
162	uint32_t uTimerHz;
163	/** The current max frequency reported by the EMTs.
164	* This gets historicize and reset by the timer callback. This is
165	* read without holding the spinlock, so needs atomic updating. */
166	uint32_t volatile uDesiredHz;
167	/** Whether the timer was started or not. */
168	bool volatile fStarted;
169	/** Set if we're starting timer. */
170	bool volatile fStarting;
171	/** The index of the next history entry (mod it). */
172	uint32_t iHzHistory;
173	/** Historicized uDesiredHz values. The array wraps around, new entries
174	* are added at iHzHistory. This is updated approximately every
175	* GVMMHOSTCPU_PPT_HIST_INTERVAL_NS by the timer callback. */
176	uint32_t aHzHistory[8];
177	/** Statistics counter for recording the number of interval changes. */
178	uint32_t cChanges;
179	/** Statistics counter for recording the number of timer starts. */
180	uint32_t cStarts;
181	} Ppt;
182	#endif /* GVMM_SCHED_WITH_PPT */
183
184	} GVMMHOSTCPU;
185	/** Pointer to the per host CPU GVMM data. */
186	typedef GVMMHOSTCPU *PGVMMHOSTCPU;
187	/** The GVMMHOSTCPU::u32Magic value (Petra, Tanya & Rachel Haden). */
188	#define GVMMHOSTCPU_MAGIC UINT32_C(0x19711011)
189	/** The interval on history entry should cover (approximately) give in
190	* nanoseconds. */
191	#define GVMMHOSTCPU_PPT_HIST_INTERVAL_NS UINT32_C(20000000)
192
193
194	/**
195	* The GVMM instance data.
196	*/
197	typedef struct GVMM
198	{
199	/** Eyecatcher / magic. */
200	uint32_t u32Magic;
201	/** The index of the head of the free handle chain. (0 is nil.) */
202	uint16_t volatile iFreeHead;
203	/** The index of the head of the active handle chain. (0 is nil.) */
204	uint16_t volatile iUsedHead;
205	/** The number of VMs. */
206	uint16_t volatile cVMs;
207	/** Alignment padding. */
208	uint16_t u16Reserved;
209	/** The number of EMTs. */
210	uint32_t volatile cEMTs;
211	/** The number of EMTs that have halted in GVMMR0SchedHalt. */
212	uint32_t volatile cHaltedEMTs;
213	/** Alignment padding. */
214	uint32_t u32Alignment;
215	/** When the next halted or sleeping EMT will wake up.
216	* This is set to 0 when it needs recalculating and to UINT64_MAX when
217	* there are no halted or sleeping EMTs in the GVMM. */
218	uint64_t uNsNextEmtWakeup;
219	/** The lock used to serialize VM creation, destruction and associated events that
220	* isn't performance critical. Owners may acquire the list lock. */
221	RTSEMFASTMUTEX CreateDestroyLock;
222	/** The lock used to serialize used list updates and accesses.
223	* This indirectly includes scheduling since the scheduler will have to walk the
224	* used list to examin running VMs. Owners may not acquire any other locks. */
225	RTSEMFASTMUTEX UsedLock;
226	/** The handle array.
227	* The size of this array defines the maximum number of currently running VMs.
228	* The first entry is unused as it represents the NIL handle. */
229	GVMHANDLE aHandles[GVMM_MAX_HANDLES];
230
231	/** @gcfgm{/GVMM/cEMTsMeansCompany, 32-bit, 0, UINT32_MAX, 1}
232	* The number of EMTs that means we no longer consider ourselves alone on a
233	* CPU/Core.
234	*/
235	uint32_t cEMTsMeansCompany;
236	/** @gcfgm{/GVMM/MinSleepAlone,32-bit, 0, 100000000, 750000, ns}
237	* The minimum sleep time for when we're alone, in nano seconds.
238	*/
239	uint32_t nsMinSleepAlone;
240	/** @gcfgm{/GVMM/MinSleepCompany,32-bit,0, 100000000, 15000, ns}
241	* The minimum sleep time for when we've got company, in nano seconds.
242	*/
243	uint32_t nsMinSleepCompany;
244	/** @gcfgm{/GVMM/EarlyWakeUp1, 32-bit, 0, 100000000, 25000, ns}
245	* The limit for the first round of early wakeups, given in nano seconds.
246	*/
247	uint32_t nsEarlyWakeUp1;
248	/** @gcfgm{/GVMM/EarlyWakeUp2, 32-bit, 0, 100000000, 50000, ns}
249	* The limit for the second round of early wakeups, given in nano seconds.
250	*/
251	uint32_t nsEarlyWakeUp2;
252
253	/** The number of entries in the host CPU array (aHostCpus). */
254	uint32_t cHostCpus;
255	/** Per host CPU data (variable length). */
256	GVMMHOSTCPU aHostCpus[1];
257	} GVMM;
258	/** Pointer to the GVMM instance data. */
259	typedef GVMM *PGVMM;
260
261	/** The GVMM::u32Magic value (Charlie Haden). */
262	#define GVMM_MAGIC UINT32_C(0x19370806)
263
264
265
266	/*******************************************************************************
267	* Global Variables *
268	*******************************************************************************/
269	/** Pointer to the GVMM instance data.
270	* (Just my general dislike for global variables.) */
271	static PGVMM g_pGVMM = NULL;
272
273	/** Macro for obtaining and validating the g_pGVMM pointer.
274	* On failure it will return from the invoking function with the specified return value.
275	*
276	* @param pGVMM The name of the pGVMM variable.
277	* @param rc The return value on failure. Use VERR_GVMM_INSTANCE for VBox
278	* status codes.
279	*/
280	#define GVMM_GET_VALID_INSTANCE(pGVMM, rc) \
281	do { \
282	(pGVMM) = g_pGVMM;\
283	AssertPtrReturn((pGVMM), (rc)); \
284	AssertMsgReturn((pGVMM)->u32Magic == GVMM_MAGIC, ("%p - %#x\n", (pGVMM), (pGVMM)->u32Magic), (rc)); \
285	} while (0)
286
287	/** Macro for obtaining and validating the g_pGVMM pointer, void function variant.
288	* On failure it will return from the invoking function.
289	*
290	* @param pGVMM The name of the pGVMM variable.
291	*/
292	#define GVMM_GET_VALID_INSTANCE_VOID(pGVMM) \
293	do { \
294	(pGVMM) = g_pGVMM;\
295	AssertPtrReturnVoid((pGVMM)); \
296	AssertMsgReturnVoid((pGVMM)->u32Magic == GVMM_MAGIC, ("%p - %#x\n", (pGVMM), (pGVMM)->u32Magic)); \
297	} while (0)
298
299
300	/*******************************************************************************
301	* Internal Functions *
302	*******************************************************************************/
303	static void gvmmR0InitPerVMData(PGVM pGVM);
304	static DECLCALLBACK(void) gvmmR0HandleObjDestructor(void pvObj, void pvGVMM, void *pvHandle);
305	static int gvmmR0ByVM(PVM pVM, PGVM ppGVM, PGVMM ppGVMM, bool fTakeUsedLock);
306	static int gvmmR0ByVMAndEMT(PVM pVM, VMCPUID idCpu, PGVM ppGVM, PGVMM ppGVMM);
307	#ifdef GVMM_SCHED_WITH_PPT
308	static DECLCALLBACK(void) gvmmR0SchedPeriodicPreemptionTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick);
309	#endif
310
311
312	/**
313	* Initializes the GVMM.
314	*
315	* This is called while owning the loader semaphore (see supdrvIOCtl_LdrLoad()).
316	*
317	* @returns VBox status code.
318	*/
319	GVMMR0DECL(int) GVMMR0Init(void)
320	{
321	LogFlow(("GVMMR0Init:\n"));
322
323	/*
324	* Allocate and initialize the instance data.
325	*/
326	uint32_t cHostCpus = RTMpGetArraySize();
327	AssertMsgReturn(cHostCpus > 0 && cHostCpus < _64K, ("%d", (int)cHostCpus), VERR_GVMM_HOST_CPU_RANGE);
328
329	PGVMM pGVMM = (PGVMM)RTMemAllocZ(RT_UOFFSETOF(GVMM, aHostCpus[cHostCpus]));
330	if (!pGVMM)
331	return VERR_NO_MEMORY;
332	int rc = RTSemFastMutexCreate(&pGVMM->CreateDestroyLock);
333	if (RT_SUCCESS(rc))
334	{
335	rc = RTSemFastMutexCreate(&pGVMM->UsedLock);
336	if (RT_SUCCESS(rc))
337	{
338	pGVMM->u32Magic = GVMM_MAGIC;
339	pGVMM->iUsedHead = 0;
340	pGVMM->iFreeHead = 1;
341
342	/* the nil handle */
343	pGVMM->aHandles[0].iSelf = 0;
344	pGVMM->aHandles[0].iNext = 0;
345
346	/* the tail */
347	unsigned i = RT_ELEMENTS(pGVMM->aHandles) - 1;
348	pGVMM->aHandles[i].iSelf = i;
349	pGVMM->aHandles[i].iNext = 0; /* nil */
350
351	/* the rest */
352	while (i-- > 1)
353	{
354	pGVMM->aHandles[i].iSelf = i;
355	pGVMM->aHandles[i].iNext = i + 1;
356	}
357
358	/* The default configuration values. */
359	uint32_t cNsResolution = RTSemEventMultiGetResolution();
360	pGVMM->cEMTsMeansCompany = 1; /** @todo should be adjusted to relative to the cpu count or something... */
361	if (cNsResolution >= 5*RT_NS_100US)
362	{
363	pGVMM->nsMinSleepAlone = 750000 /* ns (0.750 ms) /; /* @todo this should be adjusted to be 75% (or something) of the scheduler granularity... */
364	pGVMM->nsMinSleepCompany = 15000 /* ns (0.015 ms) */;
365	pGVMM->nsEarlyWakeUp1 = 25000 /* ns (0.025 ms) */;
366	pGVMM->nsEarlyWakeUp2 = 50000 /* ns (0.050 ms) */;
367	}
368	else if (cNsResolution > RT_NS_100US)
369	{
370	pGVMM->nsMinSleepAlone = cNsResolution / 2;
371	pGVMM->nsMinSleepCompany = cNsResolution / 4;
372	pGVMM->nsEarlyWakeUp1 = 0;
373	pGVMM->nsEarlyWakeUp2 = 0;
374	}
375	else
376	{
377	pGVMM->nsMinSleepAlone = 2000;
378	pGVMM->nsMinSleepCompany = 2000;
379	pGVMM->nsEarlyWakeUp1 = 0;
380	pGVMM->nsEarlyWakeUp2 = 0;
381	}
382
383	/* The host CPU data. */
384	pGVMM->cHostCpus = cHostCpus;
385	uint32_t iCpu = cHostCpus;
386	RTCPUSET PossibleSet;
387	RTMpGetSet(&PossibleSet);
388	while (iCpu-- > 0)
389	{
390	pGVMM->aHostCpus[iCpu].idxCpuSet = iCpu;
391	#ifdef GVMM_SCHED_WITH_PPT
392	pGVMM->aHostCpus[iCpu].Ppt.pTimer = NULL;
393	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
394	pGVMM->aHostCpus[iCpu].Ppt.uMinHz = 5; /** @todo Add some API which figures this one out. (not that important) */
395	pGVMM->aHostCpus[iCpu].Ppt.cTicksHistoriziationInterval = 1;
396	//pGVMM->aHostCpus[iCpu].Ppt.iTickHistorization = 0;
397	//pGVMM->aHostCpus[iCpu].Ppt.cNsInterval = 0;
398	//pGVMM->aHostCpus[iCpu].Ppt.uTimerHz = 0;
399	//pGVMM->aHostCpus[iCpu].Ppt.uDesiredHz = 0;
400	//pGVMM->aHostCpus[iCpu].Ppt.fStarted = false;
401	//pGVMM->aHostCpus[iCpu].Ppt.fStarting = false;
402	//pGVMM->aHostCpus[iCpu].Ppt.iHzHistory = 0;
403	//pGVMM->aHostCpus[iCpu].Ppt.aHzHistory = {0};
404	#endif
405
406	if (RTCpuSetIsMember(&PossibleSet, iCpu))
407	{
408	pGVMM->aHostCpus[iCpu].idCpu = RTMpCpuIdFromSetIndex(iCpu);
409	pGVMM->aHostCpus[iCpu].u32Magic = GVMMHOSTCPU_MAGIC;
410
411	#ifdef GVMM_SCHED_WITH_PPT
412	rc = RTTimerCreateEx(&pGVMM->aHostCpus[iCpu].Ppt.pTimer,
413	5010001000 /* whatever */,
414	RTTIMER_FLAGS_CPU(iCpu) \| RTTIMER_FLAGS_HIGH_RES,
415	gvmmR0SchedPeriodicPreemptionTimerCallback,
416	&pGVMM->aHostCpus[iCpu]);
417	if (RT_SUCCESS(rc))
418	rc = RTSpinlockCreate(&pGVMM->aHostCpus[iCpu].Ppt.hSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "GVMM/CPU");
419	if (RT_FAILURE(rc))
420	{
421	while (iCpu < cHostCpus)
422	{
423	RTTimerDestroy(pGVMM->aHostCpus[iCpu].Ppt.pTimer);
424	RTSpinlockDestroy(pGVMM->aHostCpus[iCpu].Ppt.hSpinlock);
425	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
426	iCpu++;
427	}
428	break;
429	}
430	#endif
431	}
432	else
433	{
434	pGVMM->aHostCpus[iCpu].idCpu = NIL_RTCPUID;
435	pGVMM->aHostCpus[iCpu].u32Magic = 0;
436	}
437	}
438	if (RT_SUCCESS(rc))
439	{
440	g_pGVMM = pGVMM;
441	LogFlow(("GVMMR0Init: pGVMM=%p cHostCpus=%u\n", pGVMM, cHostCpus));
442	return VINF_SUCCESS;
443	}
444
445	/* bail out. */
446	RTSemFastMutexDestroy(pGVMM->UsedLock);
447	pGVMM->UsedLock = NIL_RTSEMFASTMUTEX;
448	}
449	RTSemFastMutexDestroy(pGVMM->CreateDestroyLock);
450	pGVMM->CreateDestroyLock = NIL_RTSEMFASTMUTEX;
451	}
452
453	RTMemFree(pGVMM);
454	return rc;
455	}
456
457
458	/**
459	* Terminates the GVM.
460	*
461	* This is called while owning the loader semaphore (see supdrvLdrFree()).
462	* And unless something is wrong, there should be absolutely no VMs
463	* registered at this point.
464	*/
465	GVMMR0DECL(void) GVMMR0Term(void)
466	{
467	LogFlow(("GVMMR0Term:\n"));
468
469	PGVMM pGVMM = g_pGVMM;
470	g_pGVMM = NULL;
471	if (RT_UNLIKELY(!VALID_PTR(pGVMM)))
472	{
473	SUPR0Printf("GVMMR0Term: pGVMM=%p\n", pGVMM);
474	return;
475	}
476
477	/*
478	* First of all, stop all active timers.
479	*/
480	uint32_t cActiveTimers = 0;
481	uint32_t iCpu = pGVMM->cHostCpus;
482	while (iCpu-- > 0)
483	{
484	ASMAtomicWriteU32(&pGVMM->aHostCpus[iCpu].u32Magic, ~GVMMHOSTCPU_MAGIC);
485	#ifdef GVMM_SCHED_WITH_PPT
486	if ( pGVMM->aHostCpus[iCpu].Ppt.pTimer != NULL
487	&& RT_SUCCESS(RTTimerStop(pGVMM->aHostCpus[iCpu].Ppt.pTimer)))
488	cActiveTimers++;
489	#endif
490	}
491	if (cActiveTimers)
492	RTThreadSleep(1); /* fudge */
493
494	/*
495	* Invalidate the and free resources.
496	*/
497	pGVMM->u32Magic = ~GVMM_MAGIC;
498	RTSemFastMutexDestroy(pGVMM->UsedLock);
499	pGVMM->UsedLock = NIL_RTSEMFASTMUTEX;
500	RTSemFastMutexDestroy(pGVMM->CreateDestroyLock);
501	pGVMM->CreateDestroyLock = NIL_RTSEMFASTMUTEX;
502
503	pGVMM->iFreeHead = 0;
504	if (pGVMM->iUsedHead)
505	{
506	SUPR0Printf("GVMMR0Term: iUsedHead=%#x! (cVMs=%#x cEMTs=%#x)\n", pGVMM->iUsedHead, pGVMM->cVMs, pGVMM->cEMTs);
507	pGVMM->iUsedHead = 0;
508	}
509
510	#ifdef GVMM_SCHED_WITH_PPT
511	iCpu = pGVMM->cHostCpus;
512	while (iCpu-- > 0)
513	{
514	RTTimerDestroy(pGVMM->aHostCpus[iCpu].Ppt.pTimer);
515	pGVMM->aHostCpus[iCpu].Ppt.pTimer = NULL;
516	RTSpinlockDestroy(pGVMM->aHostCpus[iCpu].Ppt.hSpinlock);
517	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
518	}
519	#endif
520
521	RTMemFree(pGVMM);
522	}
523
524
525	/**
526	* A quick hack for setting global config values.
527	*
528	* @returns VBox status code.
529	*
530	* @param pSession The session handle. Used for authentication.
531	* @param pszName The variable name.
532	* @param u64Value The new value.
533	*/
534	GVMMR0DECL(int) GVMMR0SetConfig(PSUPDRVSESSION pSession, const char *pszName, uint64_t u64Value)
535	{
536	/*
537	* Validate input.
538	*/
539	PGVMM pGVMM;
540	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
541	AssertPtrReturn(pSession, VERR_INVALID_HANDLE);
542	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
543
544	/*
545	* String switch time!
546	*/
547	if (strncmp(pszName, "/GVMM/", sizeof("/GVMM/") - 1))
548	return VERR_CFGM_VALUE_NOT_FOUND; /* borrow status codes from CFGM... */
549	int rc = VINF_SUCCESS;
550	pszName += sizeof("/GVMM/") - 1;
551	if (!strcmp(pszName, "cEMTsMeansCompany"))
552	{
553	if (u64Value <= UINT32_MAX)
554	pGVMM->cEMTsMeansCompany = u64Value;
555	else
556	rc = VERR_OUT_OF_RANGE;
557	}
558	else if (!strcmp(pszName, "MinSleepAlone"))
559	{
560	if (u64Value <= RT_NS_100MS)
561	pGVMM->nsMinSleepAlone = u64Value;
562	else
563	rc = VERR_OUT_OF_RANGE;
564	}
565	else if (!strcmp(pszName, "MinSleepCompany"))
566	{
567	if (u64Value <= RT_NS_100MS)
568	pGVMM->nsMinSleepCompany = u64Value;
569	else
570	rc = VERR_OUT_OF_RANGE;
571	}
572	else if (!strcmp(pszName, "EarlyWakeUp1"))
573	{
574	if (u64Value <= RT_NS_100MS)
575	pGVMM->nsEarlyWakeUp1 = u64Value;
576	else
577	rc = VERR_OUT_OF_RANGE;
578	}
579	else if (!strcmp(pszName, "EarlyWakeUp2"))
580	{
581	if (u64Value <= RT_NS_100MS)
582	pGVMM->nsEarlyWakeUp2 = u64Value;
583	else
584	rc = VERR_OUT_OF_RANGE;
585	}
586	else
587	rc = VERR_CFGM_VALUE_NOT_FOUND;
588	return rc;
589	}
590
591
592	/**
593	* A quick hack for getting global config values.
594	*
595	* @returns VBox status code.
596	*
597	* @param pSession The session handle. Used for authentication.
598	* @param pszName The variable name.
599	* @param u64Value The new value.
600	*/
601	GVMMR0DECL(int) GVMMR0QueryConfig(PSUPDRVSESSION pSession, const char pszName, uint64_t pu64Value)
602	{
603	/*
604	* Validate input.
605	*/
606	PGVMM pGVMM;
607	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
608	AssertPtrReturn(pSession, VERR_INVALID_HANDLE);
609	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
610	AssertPtrReturn(pu64Value, VERR_INVALID_POINTER);
611
612	/*
613	* String switch time!
614	*/
615	if (strncmp(pszName, "/GVMM/", sizeof("/GVMM/") - 1))
616	return VERR_CFGM_VALUE_NOT_FOUND; /* borrow status codes from CFGM... */
617	int rc = VINF_SUCCESS;
618	pszName += sizeof("/GVMM/") - 1;
619	if (!strcmp(pszName, "cEMTsMeansCompany"))
620	*pu64Value = pGVMM->cEMTsMeansCompany;
621	else if (!strcmp(pszName, "MinSleepAlone"))
622	*pu64Value = pGVMM->nsMinSleepAlone;
623	else if (!strcmp(pszName, "MinSleepCompany"))
624	*pu64Value = pGVMM->nsMinSleepCompany;
625	else if (!strcmp(pszName, "EarlyWakeUp1"))
626	*pu64Value = pGVMM->nsEarlyWakeUp1;
627	else if (!strcmp(pszName, "EarlyWakeUp2"))
628	*pu64Value = pGVMM->nsEarlyWakeUp2;
629	else
630	rc = VERR_CFGM_VALUE_NOT_FOUND;
631	return rc;
632	}
633
634
635	/**
636	* Try acquire the 'used' lock.
637	*
638	* @returns IPRT status code, see RTSemFastMutexRequest.
639	* @param pGVMM The GVMM instance data.
640	*/
641	DECLINLINE(int) gvmmR0UsedLock(PGVMM pGVMM)
642	{
643	LogFlow(("++gvmmR0UsedLock(%p)\n", pGVMM));
644	int rc = RTSemFastMutexRequest(pGVMM->UsedLock);
645	LogFlow(("gvmmR0UsedLock(%p)->%Rrc\n", pGVMM, rc));
646	return rc;
647	}
648
649
650	/**
651	* Release the 'used' lock.
652	*
653	* @returns IPRT status code, see RTSemFastMutexRelease.
654	* @param pGVMM The GVMM instance data.
655	*/
656	DECLINLINE(int) gvmmR0UsedUnlock(PGVMM pGVMM)
657	{
658	LogFlow(("--gvmmR0UsedUnlock(%p)\n", pGVMM));
659	int rc = RTSemFastMutexRelease(pGVMM->UsedLock);
660	AssertRC(rc);
661	return rc;
662	}
663
664
665	/**
666	* Try acquire the 'create & destroy' lock.
667	*
668	* @returns IPRT status code, see RTSemFastMutexRequest.
669	* @param pGVMM The GVMM instance data.
670	*/
671	DECLINLINE(int) gvmmR0CreateDestroyLock(PGVMM pGVMM)
672	{
673	LogFlow(("++gvmmR0CreateDestroyLock(%p)\n", pGVMM));
674	int rc = RTSemFastMutexRequest(pGVMM->CreateDestroyLock);
675	LogFlow(("gvmmR0CreateDestroyLock(%p)->%Rrc\n", pGVMM, rc));
676	return rc;
677	}
678
679
680	/**
681	* Release the 'create & destroy' lock.
682	*
683	* @returns IPRT status code, see RTSemFastMutexRequest.
684	* @param pGVMM The GVMM instance data.
685	*/
686	DECLINLINE(int) gvmmR0CreateDestroyUnlock(PGVMM pGVMM)
687	{
688	LogFlow(("--gvmmR0CreateDestroyUnlock(%p)\n", pGVMM));
689	int rc = RTSemFastMutexRelease(pGVMM->CreateDestroyLock);
690	AssertRC(rc);
691	return rc;
692	}
693
694
695	/**
696	* Request wrapper for the GVMMR0CreateVM API.
697	*
698	* @returns VBox status code.
699	* @param pReq The request buffer.
700	*/
701	GVMMR0DECL(int) GVMMR0CreateVMReq(PGVMMCREATEVMREQ pReq)
702	{
703	/*
704	* Validate the request.
705	*/
706	if (!VALID_PTR(pReq))
707	return VERR_INVALID_POINTER;
708	if (pReq->Hdr.cbReq != sizeof(*pReq))
709	return VERR_INVALID_PARAMETER;
710	if (!VALID_PTR(pReq->pSession))
711	return VERR_INVALID_POINTER;
712
713	/*
714	* Execute it.
715	*/
716	PVM pVM;
717	pReq->pVMR0 = NULL;
718	pReq->pVMR3 = NIL_RTR3PTR;
719	int rc = GVMMR0CreateVM(pReq->pSession, pReq->cCpus, &pVM);
720	if (RT_SUCCESS(rc))
721	{
722	pReq->pVMR0 = pVM;
723	pReq->pVMR3 = pVM->pVMR3;
724	}
725	return rc;
726	}
727
728
729	/**
730	* Allocates the VM structure and registers it with GVM.
731	*
732	* The caller will become the VM owner and there by the EMT.
733	*
734	* @returns VBox status code.
735	* @param pSession The support driver session.
736	* @param cCpus Number of virtual CPUs for the new VM.
737	* @param ppVM Where to store the pointer to the VM structure.
738	*
739	* @thread EMT.
740	*/
741	GVMMR0DECL(int) GVMMR0CreateVM(PSUPDRVSESSION pSession, uint32_t cCpus, PVM *ppVM)
742	{
743	LogFlow(("GVMMR0CreateVM: pSession=%p\n", pSession));
744	PGVMM pGVMM;
745	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
746
747	AssertPtrReturn(ppVM, VERR_INVALID_POINTER);
748	*ppVM = NULL;
749
750	if ( cCpus == 0
751	\|\| cCpus > VMM_MAX_CPU_COUNT)
752	return VERR_INVALID_PARAMETER;
753
754	RTNATIVETHREAD hEMT0 = RTThreadNativeSelf();
755	AssertReturn(hEMT0 != NIL_RTNATIVETHREAD, VERR_GVMM_BROKEN_IPRT);
756	RTPROCESS ProcId = RTProcSelf();
757	AssertReturn(ProcId != NIL_RTPROCESS, VERR_GVMM_BROKEN_IPRT);
758
759	/*
760	* The whole allocation process is protected by the lock.
761	*/
762	int rc = gvmmR0CreateDestroyLock(pGVMM);
763	AssertRCReturn(rc, rc);
764
765	/*
766	* Allocate a handle first so we don't waste resources unnecessarily.
767	*/
768	uint16_t iHandle = pGVMM->iFreeHead;
769	if (iHandle)
770	{
771	PGVMHANDLE pHandle = &pGVMM->aHandles[iHandle];
772
773	/* consistency checks, a bit paranoid as always. */
774	if ( !pHandle->pVM
775	&& !pHandle->pGVM
776	&& !pHandle->pvObj
777	&& pHandle->iSelf == iHandle)
778	{
779	pHandle->pvObj = SUPR0ObjRegister(pSession, SUPDRVOBJTYPE_VM, gvmmR0HandleObjDestructor, pGVMM, pHandle);
780	if (pHandle->pvObj)
781	{
782	/*
783	* Move the handle from the free to used list and perform permission checks.
784	*/
785	rc = gvmmR0UsedLock(pGVMM);
786	AssertRC(rc);
787
788	pGVMM->iFreeHead = pHandle->iNext;
789	pHandle->iNext = pGVMM->iUsedHead;
790	pGVMM->iUsedHead = iHandle;
791	pGVMM->cVMs++;
792
793	pHandle->pVM = NULL;
794	pHandle->pGVM = NULL;
795	pHandle->pSession = pSession;
796	pHandle->hEMT0 = NIL_RTNATIVETHREAD;
797	pHandle->ProcId = NIL_RTPROCESS;
798
799	gvmmR0UsedUnlock(pGVMM);
800
801	rc = SUPR0ObjVerifyAccess(pHandle->pvObj, pSession, NULL);
802	if (RT_SUCCESS(rc))
803	{
804	/*
805	* Allocate the global VM structure (GVM) and initialize it.
806	*/
807	PGVM pGVM = (PGVM)RTMemAllocZ(RT_UOFFSETOF(GVM, aCpus[cCpus]));
808	if (pGVM)
809	{
810	pGVM->u32Magic = GVM_MAGIC;
811	pGVM->hSelf = iHandle;
812	pGVM->pVM = NULL;
813	pGVM->cCpus = cCpus;
814
815	gvmmR0InitPerVMData(pGVM);
816	GMMR0InitPerVMData(pGVM);
817
818	/*
819	* Allocate the shared VM structure and associated page array.
820	*/
821	const uint32_t cbVM = RT_UOFFSETOF(VM, aCpus[cCpus]);
822	const uint32_t cPages = RT_ALIGN_32(cbVM, PAGE_SIZE) >> PAGE_SHIFT;
823	rc = RTR0MemObjAllocLow(&pGVM->gvmm.s.VMMemObj, cPages << PAGE_SHIFT, false /* fExecutable */);
824	if (RT_SUCCESS(rc))
825	{
826	PVM pVM = (PVM)RTR0MemObjAddress(pGVM->gvmm.s.VMMemObj); AssertPtr(pVM);
827	memset(pVM, 0, cPages << PAGE_SHIFT);
828	pVM->enmVMState = VMSTATE_CREATING;
829	pVM->pVMR0 = pVM;
830	pVM->pSession = pSession;
831	pVM->hSelf = iHandle;
832	pVM->cbSelf = cbVM;
833	pVM->cCpus = cCpus;
834	pVM->uCpuExecutionCap = 100; /* default is no cap. */
835	pVM->offVMCPU = RT_UOFFSETOF(VM, aCpus);
836	AssertCompileMemberAlignment(VM, cpum, 64);
837	AssertCompileMemberAlignment(VM, tm, 64);
838	AssertCompileMemberAlignment(VM, aCpus, PAGE_SIZE);
839
840	rc = RTR0MemObjAllocPage(&pGVM->gvmm.s.VMPagesMemObj, cPages * sizeof(SUPPAGE), false /* fExecutable */);
841	if (RT_SUCCESS(rc))
842	{
843	PSUPPAGE paPages = (PSUPPAGE)RTR0MemObjAddress(pGVM->gvmm.s.VMPagesMemObj); AssertPtr(paPages);
844	for (uint32_t iPage = 0; iPage < cPages; iPage++)
845	{
846	paPages[iPage].uReserved = 0;
847	paPages[iPage].Phys = RTR0MemObjGetPagePhysAddr(pGVM->gvmm.s.VMMemObj, iPage);
848	Assert(paPages[iPage].Phys != NIL_RTHCPHYS);
849	}
850
851	/*
852	* Map them into ring-3.
853	*/
854	rc = RTR0MemObjMapUser(&pGVM->gvmm.s.VMMapObj, pGVM->gvmm.s.VMMemObj, (RTR3PTR)-1, 0,
855	RTMEM_PROT_READ \| RTMEM_PROT_WRITE, NIL_RTR0PROCESS);
856	if (RT_SUCCESS(rc))
857	{
858	pVM->pVMR3 = RTR0MemObjAddressR3(pGVM->gvmm.s.VMMapObj);
859	AssertPtr((void *)pVM->pVMR3);
860
861	/* Initialize all the VM pointers. */
862	for (uint32_t i = 0; i < cCpus; i++)
863	{
864	pVM->aCpus[i].pVMR0 = pVM;
865	pVM->aCpus[i].pVMR3 = pVM->pVMR3;
866	pVM->aCpus[i].idHostCpu = NIL_RTCPUID;
867	pVM->aCpus[i].hNativeThreadR0 = NIL_RTNATIVETHREAD;
868	}
869
870	rc = RTR0MemObjMapUser(&pGVM->gvmm.s.VMPagesMapObj, pGVM->gvmm.s.VMPagesMemObj, (RTR3PTR)-1, 0,
871	RTMEM_PROT_READ \| RTMEM_PROT_WRITE, NIL_RTR0PROCESS);
872	if (RT_SUCCESS(rc))
873	{
874	pVM->paVMPagesR3 = RTR0MemObjAddressR3(pGVM->gvmm.s.VMPagesMapObj);
875	AssertPtr((void *)pVM->paVMPagesR3);
876
877	/* complete the handle - take the UsedLock sem just to be careful. */
878	rc = gvmmR0UsedLock(pGVMM);
879	AssertRC(rc);
880
881	pHandle->pVM = pVM;
882	pHandle->pGVM = pGVM;
883	pHandle->hEMT0 = hEMT0;
884	pHandle->ProcId = ProcId;
885	pGVM->pVM = pVM;
886	pGVM->aCpus[0].hEMT = hEMT0;
887	pVM->aCpus[0].hNativeThreadR0 = hEMT0;
888	pGVMM->cEMTs += cCpus;
889
890	VBOXVMM_R0_GVMM_VM_CREATED(pGVM, pVM, ProcId, (void *)hEMT0, cCpus);
891
892	gvmmR0UsedUnlock(pGVMM);
893	gvmmR0CreateDestroyUnlock(pGVMM);
894
895	*ppVM = pVM;
896	Log(("GVMMR0CreateVM: pVM=%p pVMR3=%p pGVM=%p hGVM=%d\n", pVM, pVM->pVMR3, pGVM, iHandle));
897	return VINF_SUCCESS;
898	}
899
900	RTR0MemObjFree(pGVM->gvmm.s.VMMapObj, false /* fFreeMappings */);
901	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
902	}
903	RTR0MemObjFree(pGVM->gvmm.s.VMPagesMemObj, false /* fFreeMappings */);
904	pGVM->gvmm.s.VMPagesMemObj = NIL_RTR0MEMOBJ;
905	}
906	RTR0MemObjFree(pGVM->gvmm.s.VMMemObj, false /* fFreeMappings */);
907	pGVM->gvmm.s.VMMemObj = NIL_RTR0MEMOBJ;
908	}
909	}
910	}
911	/* else: The user wasn't permitted to create this VM. */
912
913	/*
914	* The handle will be freed by gvmmR0HandleObjDestructor as we release the
915	* object reference here. A little extra mess because of non-recursive lock.
916	*/
917	void *pvObj = pHandle->pvObj;
918	pHandle->pvObj = NULL;
919	gvmmR0CreateDestroyUnlock(pGVMM);
920
921	SUPR0ObjRelease(pvObj, pSession);
922
923	SUPR0Printf("GVMMR0CreateVM: failed, rc=%d\n", rc);
924	return rc;
925	}
926
927	rc = VERR_NO_MEMORY;
928	}
929	else
930	rc = VERR_GVMM_IPE_1;
931	}
932	else
933	rc = VERR_GVM_TOO_MANY_VMS;
934
935	gvmmR0CreateDestroyUnlock(pGVMM);
936	return rc;
937	}
938
939
940	/**
941	* Initializes the per VM data belonging to GVMM.
942	*
943	* @param pGVM Pointer to the global VM structure.
944	*/
945	static void gvmmR0InitPerVMData(PGVM pGVM)
946	{
947	AssertCompile(RT_SIZEOFMEMB(GVM,gvmm.s) <= RT_SIZEOFMEMB(GVM,gvmm.padding));
948	AssertCompile(RT_SIZEOFMEMB(GVMCPU,gvmm.s) <= RT_SIZEOFMEMB(GVMCPU,gvmm.padding));
949	pGVM->gvmm.s.VMMemObj = NIL_RTR0MEMOBJ;
950	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
951	pGVM->gvmm.s.VMPagesMemObj = NIL_RTR0MEMOBJ;
952	pGVM->gvmm.s.VMPagesMapObj = NIL_RTR0MEMOBJ;
953	pGVM->gvmm.s.fDoneVMMR0Init = false;
954	pGVM->gvmm.s.fDoneVMMR0Term = false;
955
956	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
957	{
958	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
959	pGVM->aCpus[i].hEMT = NIL_RTNATIVETHREAD;
960	}
961	}
962
963
964	/**
965	* Does the VM initialization.
966	*
967	* @returns VBox status code.
968	* @param pVM Pointer to the shared VM structure.
969	*/
970	GVMMR0DECL(int) GVMMR0InitVM(PVM pVM)
971	{
972	LogFlow(("GVMMR0InitVM: pVM=%p\n", pVM));
973
974	/*
975	* Validate the VM structure, state and handle.
976	*/
977	PGVM pGVM;
978	PGVMM pGVMM;
979	int rc = gvmmR0ByVMAndEMT(pVM, 0 /* idCpu */, &pGVM, &pGVMM);
980	if (RT_SUCCESS(rc))
981	{
982	if ( !pGVM->gvmm.s.fDoneVMMR0Init
983	&& pGVM->aCpus[0].gvmm.s.HaltEventMulti == NIL_RTSEMEVENTMULTI)
984	{
985	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
986	{
987	rc = RTSemEventMultiCreate(&pGVM->aCpus[i].gvmm.s.HaltEventMulti);
988	if (RT_FAILURE(rc))
989	{
990	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
991	break;
992	}
993	}
994	}
995	else
996	rc = VERR_WRONG_ORDER;
997	}
998
999	LogFlow(("GVMMR0InitVM: returns %Rrc\n", rc));
1000	return rc;
1001	}
1002
1003
1004	/**
1005	* Indicates that we're done with the ring-0 initialization
1006	* of the VM.
1007	*
1008	* @param pVM Pointer to the shared VM structure.
1009	* @thread EMT(0)
1010	*/
1011	GVMMR0DECL(void) GVMMR0DoneInitVM(PVM pVM)
1012	{
1013	/* Validate the VM structure, state and handle. */
1014	PGVM pGVM;
1015	PGVMM pGVMM;
1016	int rc = gvmmR0ByVMAndEMT(pVM, 0 /* idCpu */, &pGVM, &pGVMM);
1017	AssertRCReturnVoid(rc);
1018
1019	/* Set the indicator. */
1020	pGVM->gvmm.s.fDoneVMMR0Init = true;
1021	}
1022
1023
1024	/**
1025	* Indicates that we're doing the ring-0 termination of the VM.
1026	*
1027	* @returns true if termination hasn't been done already, false if it has.
1028	* @param pVM Pointer to the shared VM structure.
1029	* @param pGVM Pointer to the global VM structure. Optional.
1030	* @thread EMT(0)
1031	*/
1032	GVMMR0DECL(bool) GVMMR0DoingTermVM(PVM pVM, PGVM pGVM)
1033	{
1034	/* Validate the VM structure, state and handle. */
1035	AssertPtrNullReturn(pGVM, false);
1036	AssertReturn(!pGVM \|\| pGVM->u32Magic == GVM_MAGIC, false);
1037	if (!pGVM)
1038	{
1039	PGVMM pGVMM;
1040	int rc = gvmmR0ByVMAndEMT(pVM, 0 /* idCpu */, &pGVM, &pGVMM);
1041	AssertRCReturn(rc, false);
1042	}
1043
1044	/* Set the indicator. */
1045	if (pGVM->gvmm.s.fDoneVMMR0Term)
1046	return false;
1047	pGVM->gvmm.s.fDoneVMMR0Term = true;
1048	return true;
1049	}
1050
1051
1052	/**
1053	* Destroys the VM, freeing all associated resources (the ring-0 ones anyway).
1054	*
1055	* This is call from the vmR3DestroyFinalBit and from a error path in VMR3Create,
1056	* and the caller is not the EMT thread, unfortunately. For security reasons, it
1057	* would've been nice if the caller was actually the EMT thread or that we somehow
1058	* could've associated the calling thread with the VM up front.
1059	*
1060	* @returns VBox status code.
1061	* @param pVM Where to store the pointer to the VM structure.
1062	*
1063	* @thread EMT(0) if it's associated with the VM, otherwise any thread.
1064	*/
1065	GVMMR0DECL(int) GVMMR0DestroyVM(PVM pVM)
1066	{
1067	LogFlow(("GVMMR0DestroyVM: pVM=%p\n", pVM));
1068	PGVMM pGVMM;
1069	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1070
1071
1072	/*
1073	* Validate the VM structure, state and caller.
1074	*/
1075	AssertPtrReturn(pVM, VERR_INVALID_POINTER);
1076	AssertReturn(!((uintptr_t)pVM & PAGE_OFFSET_MASK), VERR_INVALID_POINTER);
1077	AssertMsgReturn(pVM->enmVMState >= VMSTATE_CREATING && pVM->enmVMState <= VMSTATE_TERMINATED, ("%d\n", pVM->enmVMState), VERR_WRONG_ORDER);
1078
1079	uint32_t hGVM = pVM->hSelf;
1080	AssertReturn(hGVM != NIL_GVM_HANDLE, VERR_INVALID_HANDLE);
1081	AssertReturn(hGVM < RT_ELEMENTS(pGVMM->aHandles), VERR_INVALID_HANDLE);
1082
1083	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1084	AssertReturn(pHandle->pVM == pVM, VERR_NOT_OWNER);
1085
1086	RTPROCESS ProcId = RTProcSelf();
1087	RTNATIVETHREAD hSelf = RTThreadNativeSelf();
1088	AssertReturn( ( pHandle->hEMT0 == hSelf
1089	&& pHandle->ProcId == ProcId)
1090	\|\| pHandle->hEMT0 == NIL_RTNATIVETHREAD, VERR_NOT_OWNER);
1091
1092	/*
1093	* Lookup the handle and destroy the object.
1094	* Since the lock isn't recursive and we'll have to leave it before dereferencing the
1095	* object, we take some precautions against racing callers just in case...
1096	*/
1097	int rc = gvmmR0CreateDestroyLock(pGVMM);
1098	AssertRC(rc);
1099
1100	/* be careful here because we might theoretically be racing someone else cleaning up. */
1101	if ( pHandle->pVM == pVM
1102	&& ( ( pHandle->hEMT0 == hSelf
1103	&& pHandle->ProcId == ProcId)
1104	\|\| pHandle->hEMT0 == NIL_RTNATIVETHREAD)
1105	&& VALID_PTR(pHandle->pvObj)
1106	&& VALID_PTR(pHandle->pSession)
1107	&& VALID_PTR(pHandle->pGVM)
1108	&& pHandle->pGVM->u32Magic == GVM_MAGIC)
1109	{
1110	void *pvObj = pHandle->pvObj;
1111	pHandle->pvObj = NULL;
1112	gvmmR0CreateDestroyUnlock(pGVMM);
1113
1114	SUPR0ObjRelease(pvObj, pHandle->pSession);
1115	}
1116	else
1117	{
1118	SUPR0Printf("GVMMR0DestroyVM: pHandle=%p:{.pVM=%p, .hEMT0=%p, .ProcId=%u, .pvObj=%p} pVM=%p hSelf=%p\n",
1119	pHandle, pHandle->pVM, pHandle->hEMT0, pHandle->ProcId, pHandle->pvObj, pVM, hSelf);
1120	gvmmR0CreateDestroyUnlock(pGVMM);
1121	rc = VERR_GVMM_IPE_2;
1122	}
1123
1124	return rc;
1125	}
1126
1127
1128	/**
1129	* Performs VM cleanup task as part of object destruction.
1130	*
1131	* @param pGVM The GVM pointer.
1132	*/
1133	static void gvmmR0CleanupVM(PGVM pGVM)
1134	{
1135	if ( pGVM->gvmm.s.fDoneVMMR0Init
1136	&& !pGVM->gvmm.s.fDoneVMMR0Term)
1137	{
1138	if ( pGVM->gvmm.s.VMMemObj != NIL_RTR0MEMOBJ
1139	&& RTR0MemObjAddress(pGVM->gvmm.s.VMMemObj) == pGVM->pVM)
1140	{
1141	LogFlow(("gvmmR0CleanupVM: Calling VMMR0TermVM\n"));
1142	VMMR0TermVM(pGVM->pVM, pGVM);
1143	}
1144	else
1145	AssertMsgFailed(("gvmmR0CleanupVM: VMMemObj=%p pVM=%p\n", pGVM->gvmm.s.VMMemObj, pGVM->pVM));
1146	}
1147
1148	GMMR0CleanupVM(pGVM);
1149	}
1150
1151
1152	/**
1153	* Handle destructor.
1154	*
1155	* @param pvGVMM The GVM instance pointer.
1156	* @param pvHandle The handle pointer.
1157	*/
1158	static DECLCALLBACK(void) gvmmR0HandleObjDestructor(void pvObj, void pvGVMM, void *pvHandle)
1159	{
1160	LogFlow(("gvmmR0HandleObjDestructor: %p %p %p\n", pvObj, pvGVMM, pvHandle));
1161
1162	/*
1163	* Some quick, paranoid, input validation.
1164	*/
1165	PGVMHANDLE pHandle = (PGVMHANDLE)pvHandle;
1166	AssertPtr(pHandle);
1167	PGVMM pGVMM = (PGVMM)pvGVMM;
1168	Assert(pGVMM == g_pGVMM);
1169	const uint16_t iHandle = pHandle - &pGVMM->aHandles[0];
1170	if ( !iHandle
1171	\|\| iHandle >= RT_ELEMENTS(pGVMM->aHandles)
1172	\|\| iHandle != pHandle->iSelf)
1173	{
1174	SUPR0Printf("GVM: handle %d is out of range or corrupt (iSelf=%d)!\n", iHandle, pHandle->iSelf);
1175	return;
1176	}
1177
1178	int rc = gvmmR0CreateDestroyLock(pGVMM);
1179	AssertRC(rc);
1180	rc = gvmmR0UsedLock(pGVMM);
1181	AssertRC(rc);
1182
1183	/*
1184	* This is a tad slow but a doubly linked list is too much hassle.
1185	*/
1186	if (RT_UNLIKELY(pHandle->iNext >= RT_ELEMENTS(pGVMM->aHandles)))
1187	{
1188	SUPR0Printf("GVM: used list index %d is out of range!\n", pHandle->iNext);
1189	gvmmR0UsedUnlock(pGVMM);
1190	gvmmR0CreateDestroyUnlock(pGVMM);
1191	return;
1192	}
1193
1194	if (pGVMM->iUsedHead == iHandle)
1195	pGVMM->iUsedHead = pHandle->iNext;
1196	else
1197	{
1198	uint16_t iPrev = pGVMM->iUsedHead;
1199	int c = RT_ELEMENTS(pGVMM->aHandles) + 2;
1200	while (iPrev)
1201	{
1202	if (RT_UNLIKELY(iPrev >= RT_ELEMENTS(pGVMM->aHandles)))
1203	{
1204	SUPR0Printf("GVM: used list index %d is out of range!\n", iPrev);
1205	gvmmR0UsedUnlock(pGVMM);
1206	gvmmR0CreateDestroyUnlock(pGVMM);
1207	return;
1208	}
1209	if (RT_UNLIKELY(c-- <= 0))
1210	{
1211	iPrev = 0;
1212	break;
1213	}
1214
1215	if (pGVMM->aHandles[iPrev].iNext == iHandle)
1216	break;
1217	iPrev = pGVMM->aHandles[iPrev].iNext;
1218	}
1219	if (!iPrev)
1220	{
1221	SUPR0Printf("GVM: can't find the handle previous previous of %d!\n", pHandle->iSelf);
1222	gvmmR0UsedUnlock(pGVMM);
1223	gvmmR0CreateDestroyUnlock(pGVMM);
1224	return;
1225	}
1226
1227	Assert(pGVMM->aHandles[iPrev].iNext == iHandle);
1228	pGVMM->aHandles[iPrev].iNext = pHandle->iNext;
1229	}
1230	pHandle->iNext = 0;
1231	pGVMM->cVMs--;
1232
1233	/*
1234	* Do the global cleanup round.
1235	*/
1236	PGVM pGVM = pHandle->pGVM;
1237	if ( VALID_PTR(pGVM)
1238	&& pGVM->u32Magic == GVM_MAGIC)
1239	{
1240	pGVMM->cEMTs -= pGVM->cCpus;
1241	gvmmR0UsedUnlock(pGVMM);
1242
1243	gvmmR0CleanupVM(pGVM);
1244
1245	/*
1246	* Do the GVMM cleanup - must be done last.
1247	*/
1248	/* The VM and VM pages mappings/allocations. */
1249	if (pGVM->gvmm.s.VMPagesMapObj != NIL_RTR0MEMOBJ)
1250	{
1251	rc = RTR0MemObjFree(pGVM->gvmm.s.VMPagesMapObj, false /* fFreeMappings */); AssertRC(rc);
1252	pGVM->gvmm.s.VMPagesMapObj = NIL_RTR0MEMOBJ;
1253	}
1254
1255	if (pGVM->gvmm.s.VMMapObj != NIL_RTR0MEMOBJ)
1256	{
1257	rc = RTR0MemObjFree(pGVM->gvmm.s.VMMapObj, false /* fFreeMappings */); AssertRC(rc);
1258	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
1259	}
1260
1261	if (pGVM->gvmm.s.VMPagesMemObj != NIL_RTR0MEMOBJ)
1262	{
1263	rc = RTR0MemObjFree(pGVM->gvmm.s.VMPagesMemObj, false /* fFreeMappings */); AssertRC(rc);
1264	pGVM->gvmm.s.VMPagesMemObj = NIL_RTR0MEMOBJ;
1265	}
1266
1267	if (pGVM->gvmm.s.VMMemObj != NIL_RTR0MEMOBJ)
1268	{
1269	rc = RTR0MemObjFree(pGVM->gvmm.s.VMMemObj, false /* fFreeMappings */); AssertRC(rc);
1270	pGVM->gvmm.s.VMMemObj = NIL_RTR0MEMOBJ;
1271	}
1272
1273	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
1274	{
1275	if (pGVM->aCpus[i].gvmm.s.HaltEventMulti != NIL_RTSEMEVENTMULTI)
1276	{
1277	rc = RTSemEventMultiDestroy(pGVM->aCpus[i].gvmm.s.HaltEventMulti); AssertRC(rc);
1278	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
1279	}
1280	}
1281
1282	/* the GVM structure itself. */
1283	pGVM->u32Magic \|= UINT32_C(0x80000000);
1284	RTMemFree(pGVM);
1285
1286	/* Re-acquire the UsedLock before freeing the handle since we're updating handle fields. */
1287	rc = gvmmR0UsedLock(pGVMM);
1288	AssertRC(rc);
1289	}
1290	/* else: GVMMR0CreateVM cleanup. */
1291
1292	/*
1293	* Free the handle.
1294	*/
1295	pHandle->iNext = pGVMM->iFreeHead;
1296	pGVMM->iFreeHead = iHandle;
1297	ASMAtomicWriteNullPtr(&pHandle->pGVM);
1298	ASMAtomicWriteNullPtr(&pHandle->pVM);
1299	ASMAtomicWriteNullPtr(&pHandle->pvObj);
1300	ASMAtomicWriteNullPtr(&pHandle->pSession);
1301	ASMAtomicWriteHandle(&pHandle->hEMT0, NIL_RTNATIVETHREAD);
1302	ASMAtomicWriteU32(&pHandle->ProcId, NIL_RTPROCESS);
1303
1304	gvmmR0UsedUnlock(pGVMM);
1305	gvmmR0CreateDestroyUnlock(pGVMM);
1306	LogFlow(("gvmmR0HandleObjDestructor: returns\n"));
1307	}
1308
1309
1310	/**
1311	* Registers the calling thread as the EMT of a Virtual CPU.
1312	*
1313	* Note that VCPU 0 is automatically registered during VM creation.
1314	*
1315	* @returns VBox status code
1316	* @param pVM The shared VM structure (the ring-0 mapping).
1317	* @param idCpu VCPU id.
1318	*/
1319	GVMMR0DECL(int) GVMMR0RegisterVCpu(PVM pVM, VMCPUID idCpu)
1320	{
1321	AssertReturn(idCpu != 0, VERR_NOT_OWNER);
1322
1323	/*
1324	* Validate the VM structure, state and handle.
1325	*/
1326	PGVM pGVM;
1327	PGVMM pGVMM;
1328	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, false /* fTakeUsedLock */);
1329	if (RT_FAILURE(rc))
1330	return rc;
1331
1332	AssertReturn(idCpu < pGVM->cCpus, VERR_INVALID_CPU_ID);
1333	AssertReturn(pGVM->aCpus[idCpu].hEMT == NIL_RTNATIVETHREAD, VERR_ACCESS_DENIED);
1334	Assert(pGVM->cCpus == pVM->cCpus);
1335	Assert(pVM->aCpus[idCpu].hNativeThreadR0 == NIL_RTNATIVETHREAD);
1336
1337	pVM->aCpus[idCpu].hNativeThreadR0 = pGVM->aCpus[idCpu].hEMT = RTThreadNativeSelf();
1338
1339	return VINF_SUCCESS;
1340	}
1341
1342
1343	/**
1344	* Lookup a GVM structure by its handle.
1345	*
1346	* @returns The GVM pointer on success, NULL on failure.
1347	* @param hGVM The global VM handle. Asserts on bad handle.
1348	*/
1349	GVMMR0DECL(PGVM) GVMMR0ByHandle(uint32_t hGVM)
1350	{
1351	PGVMM pGVMM;
1352	GVMM_GET_VALID_INSTANCE(pGVMM, NULL);
1353
1354	/*
1355	* Validate.
1356	*/
1357	AssertReturn(hGVM != NIL_GVM_HANDLE, NULL);
1358	AssertReturn(hGVM < RT_ELEMENTS(pGVMM->aHandles), NULL);
1359
1360	/*
1361	* Look it up.
1362	*/
1363	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1364	AssertPtrReturn(pHandle->pVM, NULL);
1365	AssertPtrReturn(pHandle->pvObj, NULL);
1366	PGVM pGVM = pHandle->pGVM;
1367	AssertPtrReturn(pGVM, NULL);
1368	AssertReturn(pGVM->pVM == pHandle->pVM, NULL);
1369
1370	return pHandle->pGVM;
1371	}
1372
1373
1374	/**
1375	* Lookup a GVM structure by the shared VM structure.
1376	*
1377	* The calling thread must be in the same process as the VM. All current lookups
1378	* are by threads inside the same process, so this will not be an issue.
1379	*
1380	* @returns VBox status code.
1381	* @param pVM The shared VM structure (the ring-0 mapping).
1382	* @param ppGVM Where to store the GVM pointer.
1383	* @param ppGVMM Where to store the pointer to the GVMM instance data.
1384	* @param fTakeUsedLock Whether to take the used lock or not.
1385	* Be very careful if not taking the lock as it's possible that
1386	* the VM will disappear then.
1387	*
1388	* @remark This will not assert on an invalid pVM but try return silently.
1389	*/
1390	static int gvmmR0ByVM(PVM pVM, PGVM ppGVM, PGVMM ppGVMM, bool fTakeUsedLock)
1391	{
1392	RTPROCESS ProcId = RTProcSelf();
1393	PGVMM pGVMM;
1394	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1395
1396	/*
1397	* Validate.
1398	*/
1399	if (RT_UNLIKELY( !VALID_PTR(pVM)
1400	\|\| ((uintptr_t)pVM & PAGE_OFFSET_MASK)))
1401	return VERR_INVALID_POINTER;
1402	if (RT_UNLIKELY( pVM->enmVMState < VMSTATE_CREATING
1403	\|\| pVM->enmVMState >= VMSTATE_TERMINATED))
1404	return VERR_INVALID_POINTER;
1405
1406	uint16_t hGVM = pVM->hSelf;
1407	if (RT_UNLIKELY( hGVM == NIL_GVM_HANDLE
1408	\|\| hGVM >= RT_ELEMENTS(pGVMM->aHandles)))
1409	return VERR_INVALID_HANDLE;
1410
1411	/*
1412	* Look it up.
1413	*/
1414	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1415	PGVM pGVM;
1416	if (fTakeUsedLock)
1417	{
1418	int rc = gvmmR0UsedLock(pGVMM);
1419	AssertRCReturn(rc, rc);
1420
1421	pGVM = pHandle->pGVM;
1422	if (RT_UNLIKELY( pHandle->pVM != pVM
1423	\|\| pHandle->ProcId != ProcId
1424	\|\| !VALID_PTR(pHandle->pvObj)
1425	\|\| !VALID_PTR(pGVM)
1426	\|\| pGVM->pVM != pVM))
1427	{
1428	gvmmR0UsedUnlock(pGVMM);
1429	return VERR_INVALID_HANDLE;
1430	}
1431	}
1432	else
1433	{
1434	if (RT_UNLIKELY(pHandle->pVM != pVM))
1435	return VERR_INVALID_HANDLE;
1436	if (RT_UNLIKELY(pHandle->ProcId != ProcId))
1437	return VERR_INVALID_HANDLE;
1438	if (RT_UNLIKELY(!VALID_PTR(pHandle->pvObj)))
1439	return VERR_INVALID_HANDLE;
1440
1441	pGVM = pHandle->pGVM;
1442	if (RT_UNLIKELY(!VALID_PTR(pGVM)))
1443	return VERR_INVALID_HANDLE;
1444	if (RT_UNLIKELY(pGVM->pVM != pVM))
1445	return VERR_INVALID_HANDLE;
1446	}
1447
1448	*ppGVM = pGVM;
1449	*ppGVMM = pGVMM;
1450	return VINF_SUCCESS;
1451	}
1452
1453
1454	/**
1455	* Lookup a GVM structure by the shared VM structure.
1456	*
1457	* @returns VBox status code.
1458	* @param pVM The shared VM structure (the ring-0 mapping).
1459	* @param ppGVM Where to store the GVM pointer.
1460	*
1461	* @remark This will not take the 'used'-lock because it doesn't do
1462	* nesting and this function will be used from under the lock.
1463	*/
1464	GVMMR0DECL(int) GVMMR0ByVM(PVM pVM, PGVM *ppGVM)
1465	{
1466	PGVMM pGVMM;
1467	return gvmmR0ByVM(pVM, ppGVM, &pGVMM, false /* fTakeUsedLock */);
1468	}
1469
1470
1471	/**
1472	* Lookup a GVM structure by the shared VM structure and ensuring that the
1473	* caller is an EMT thread.
1474	*
1475	* @returns VBox status code.
1476	* @param pVM The shared VM structure (the ring-0 mapping).
1477	* @param idCpu The Virtual CPU ID of the calling EMT.
1478	* @param ppGVM Where to store the GVM pointer.
1479	* @param ppGVMM Where to store the pointer to the GVMM instance data.
1480	* @thread EMT
1481	*
1482	* @remark This will assert in all failure paths.
1483	*/
1484	static int gvmmR0ByVMAndEMT(PVM pVM, VMCPUID idCpu, PGVM ppGVM, PGVMM ppGVMM)
1485	{
1486	PGVMM pGVMM;
1487	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1488
1489	/*
1490	* Validate.
1491	*/
1492	AssertPtrReturn(pVM, VERR_INVALID_POINTER);
1493	AssertReturn(!((uintptr_t)pVM & PAGE_OFFSET_MASK), VERR_INVALID_POINTER);
1494
1495	uint16_t hGVM = pVM->hSelf;
1496	AssertReturn(hGVM != NIL_GVM_HANDLE, VERR_INVALID_HANDLE);
1497	AssertReturn(hGVM < RT_ELEMENTS(pGVMM->aHandles), VERR_INVALID_HANDLE);
1498
1499	/*
1500	* Look it up.
1501	*/
1502	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1503	AssertReturn(pHandle->pVM == pVM, VERR_NOT_OWNER);
1504	RTPROCESS ProcId = RTProcSelf();
1505	AssertReturn(pHandle->ProcId == ProcId, VERR_NOT_OWNER);
1506	AssertPtrReturn(pHandle->pvObj, VERR_NOT_OWNER);
1507
1508	PGVM pGVM = pHandle->pGVM;
1509	AssertPtrReturn(pGVM, VERR_NOT_OWNER);
1510	AssertReturn(pGVM->pVM == pVM, VERR_NOT_OWNER);
1511	RTNATIVETHREAD hAllegedEMT = RTThreadNativeSelf();
1512	AssertReturn(idCpu < pGVM->cCpus, VERR_INVALID_CPU_ID);
1513	AssertReturn(pGVM->aCpus[idCpu].hEMT == hAllegedEMT, VERR_NOT_OWNER);
1514
1515	*ppGVM = pGVM;
1516	*ppGVMM = pGVMM;
1517	return VINF_SUCCESS;
1518	}
1519
1520
1521	/**
1522	* Lookup a GVM structure by the shared VM structure
1523	* and ensuring that the caller is the EMT thread.
1524	*
1525	* @returns VBox status code.
1526	* @param pVM The shared VM structure (the ring-0 mapping).
1527	* @param idCpu The Virtual CPU ID of the calling EMT.
1528	* @param ppGVM Where to store the GVM pointer.
1529	* @thread EMT
1530	*/
1531	GVMMR0DECL(int) GVMMR0ByVMAndEMT(PVM pVM, VMCPUID idCpu, PGVM *ppGVM)
1532	{
1533	AssertPtrReturn(ppGVM, VERR_INVALID_POINTER);
1534	PGVMM pGVMM;
1535	return gvmmR0ByVMAndEMT(pVM, idCpu, ppGVM, &pGVMM);
1536	}
1537
1538
1539	/**
1540	* Lookup a VM by its global handle.
1541	*
1542	* @returns The VM handle on success, NULL on failure.
1543	* @param hGVM The global VM handle. Asserts on bad handle.
1544	*/
1545	GVMMR0DECL(PVM) GVMMR0GetVMByHandle(uint32_t hGVM)
1546	{
1547	PGVM pGVM = GVMMR0ByHandle(hGVM);
1548	return pGVM ? pGVM->pVM : NULL;
1549	}
1550
1551
1552	/**
1553	* Looks up the VM belonging to the specified EMT thread.
1554	*
1555	* This is used by the assertion machinery in VMMR0.cpp to avoid causing
1556	* unnecessary kernel panics when the EMT thread hits an assertion. The
1557	* call may or not be an EMT thread.
1558	*
1559	* @returns The VM handle on success, NULL on failure.
1560	* @param hEMT The native thread handle of the EMT.
1561	* NIL_RTNATIVETHREAD means the current thread
1562	*/
1563	GVMMR0DECL(PVM) GVMMR0GetVMByEMT(RTNATIVETHREAD hEMT)
1564	{
1565	/*
1566	* No Assertions here as we're usually called in a AssertMsgN or
1567	* RTAssert* context.
1568	*/
1569	PGVMM pGVMM = g_pGVMM;
1570	if ( !VALID_PTR(pGVMM)
1571	\|\| pGVMM->u32Magic != GVMM_MAGIC)
1572	return NULL;
1573
1574	if (hEMT == NIL_RTNATIVETHREAD)
1575	hEMT = RTThreadNativeSelf();
1576	RTPROCESS ProcId = RTProcSelf();
1577
1578	/*
1579	* Search the handles in a linear fashion as we don't dare to take the lock (assert).
1580	*/
1581	for (unsigned i = 1; i < RT_ELEMENTS(pGVMM->aHandles); i++)
1582	{
1583	if ( pGVMM->aHandles[i].iSelf == i
1584	&& pGVMM->aHandles[i].ProcId == ProcId
1585	&& VALID_PTR(pGVMM->aHandles[i].pvObj)
1586	&& VALID_PTR(pGVMM->aHandles[i].pVM)
1587	&& VALID_PTR(pGVMM->aHandles[i].pGVM))
1588	{
1589	if (pGVMM->aHandles[i].hEMT0 == hEMT)
1590	return pGVMM->aHandles[i].pVM;
1591
1592	/* This is fearly safe with the current process per VM approach. */
1593	PGVM pGVM = pGVMM->aHandles[i].pGVM;
1594	VMCPUID const cCpus = pGVM->cCpus;
1595	if ( cCpus < 1
1596	\|\| cCpus > VMM_MAX_CPU_COUNT)
1597	continue;
1598	for (VMCPUID idCpu = 1; idCpu < cCpus; idCpu++)
1599	if (pGVM->aCpus[idCpu].hEMT == hEMT)
1600	return pGVMM->aHandles[i].pVM;
1601	}
1602	}
1603	return NULL;
1604	}
1605
1606
1607	/**
1608	* This is will wake up expired and soon-to-be expired VMs.
1609	*
1610	* @returns Number of VMs that has been woken up.
1611	* @param pGVMM Pointer to the GVMM instance data.
1612	* @param u64Now The current time.
1613	*/
1614	static unsigned gvmmR0SchedDoWakeUps(PGVMM pGVMM, uint64_t u64Now)
1615	{
1616	/*
1617	* Skip this if we've got disabled because of high resolution wakeups or by
1618	* the user.
1619	*/
1620	if ( !pGVMM->nsEarlyWakeUp1
1621	&& !pGVMM->nsEarlyWakeUp2)
1622	return 0;
1623
1624	/** @todo Rewrite this algorithm. See performance defect XYZ. */
1625
1626	/*
1627	* A cheap optimization to stop wasting so much time here on big setups.
1628	*/
1629	const uint64_t uNsEarlyWakeUp2 = u64Now + pGVMM->nsEarlyWakeUp2;
1630	if ( pGVMM->cHaltedEMTs == 0
1631	\|\| uNsEarlyWakeUp2 > pGVMM->uNsNextEmtWakeup)
1632	return 0;
1633
1634	/*
1635	* The first pass will wake up VMs which have actually expired
1636	* and look for VMs that should be woken up in the 2nd and 3rd passes.
1637	*/
1638	const uint64_t uNsEarlyWakeUp1 = u64Now + pGVMM->nsEarlyWakeUp1;
1639	uint64_t u64Min = UINT64_MAX;
1640	unsigned cWoken = 0;
1641	unsigned cHalted = 0;
1642	unsigned cTodo2nd = 0;
1643	unsigned cTodo3rd = 0;
1644	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
1645	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
1646	i = pGVMM->aHandles[i].iNext)
1647	{
1648	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
1649	if ( VALID_PTR(pCurGVM)
1650	&& pCurGVM->u32Magic == GVM_MAGIC)
1651	{
1652	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
1653	{
1654	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
1655	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
1656	if (u64)
1657	{
1658	if (u64 <= u64Now)
1659	{
1660	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
1661	{
1662	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
1663	AssertRC(rc);
1664	cWoken++;
1665	}
1666	}
1667	else
1668	{
1669	cHalted++;
1670	if (u64 <= uNsEarlyWakeUp1)
1671	cTodo2nd++;
1672	else if (u64 <= uNsEarlyWakeUp2)
1673	cTodo3rd++;
1674	else if (u64 < u64Min)
1675	u64 = u64Min;
1676	}
1677	}
1678	}
1679	}
1680	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
1681	}
1682
1683	if (cTodo2nd)
1684	{
1685	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
1686	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
1687	i = pGVMM->aHandles[i].iNext)
1688	{
1689	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
1690	if ( VALID_PTR(pCurGVM)
1691	&& pCurGVM->u32Magic == GVM_MAGIC)
1692	{
1693	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
1694	{
1695	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
1696	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
1697	if ( u64
1698	&& u64 <= uNsEarlyWakeUp1)
1699	{
1700	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
1701	{
1702	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
1703	AssertRC(rc);
1704	cWoken++;
1705	}
1706	}
1707	}
1708	}
1709	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
1710	}
1711	}
1712
1713	if (cTodo3rd)
1714	{
1715	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
1716	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
1717	i = pGVMM->aHandles[i].iNext)
1718	{
1719	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
1720	if ( VALID_PTR(pCurGVM)
1721	&& pCurGVM->u32Magic == GVM_MAGIC)
1722	{
1723	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
1724	{
1725	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
1726	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
1727	if ( u64
1728	&& u64 <= uNsEarlyWakeUp2)
1729	{
1730	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
1731	{
1732	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
1733	AssertRC(rc);
1734	cWoken++;
1735	}
1736	}
1737	}
1738	}
1739	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
1740	}
1741	}
1742
1743	/*
1744	* Set the minimum value.
1745	*/
1746	pGVMM->uNsNextEmtWakeup = u64Min;
1747
1748	return cWoken;
1749	}
1750
1751
1752	/**
1753	* Halt the EMT thread.
1754	*
1755	* @returns VINF_SUCCESS normal wakeup (timeout or kicked by other thread).
1756	* VERR_INTERRUPTED if a signal was scheduled for the thread.
1757	* @param pVM Pointer to the shared VM structure.
1758	* @param idCpu The Virtual CPU ID of the calling EMT.
1759	* @param u64ExpireGipTime The time for the sleep to expire expressed as GIP time.
1760	* @thread EMT(idCpu).
1761	*/
1762	GVMMR0DECL(int) GVMMR0SchedHalt(PVM pVM, VMCPUID idCpu, uint64_t u64ExpireGipTime)
1763	{
1764	LogFlow(("GVMMR0SchedHalt: pVM=%p\n", pVM));
1765
1766	/*
1767	* Validate the VM structure, state and handle.
1768	*/
1769	PGVM pGVM;
1770	PGVMM pGVMM;
1771	int rc = gvmmR0ByVMAndEMT(pVM, idCpu, &pGVM, &pGVMM);
1772	if (RT_FAILURE(rc))
1773	return rc;
1774	pGVM->gvmm.s.StatsSched.cHaltCalls++;
1775
1776	PGVMCPU pCurGVCpu = &pGVM->aCpus[idCpu];
1777	Assert(!pCurGVCpu->gvmm.s.u64HaltExpire);
1778
1779	/*
1780	* Take the UsedList semaphore, get the current time
1781	* and check if anyone needs waking up.
1782	* Interrupts must NOT be disabled at this point because we ask for GIP time!
1783	*/
1784	rc = gvmmR0UsedLock(pGVMM);
1785	AssertRC(rc);
1786
1787	pCurGVCpu->gvmm.s.iCpuEmt = ASMGetApicId();
1788
1789	/* GIP hack: We might are frequently sleeping for short intervals where the
1790	difference between GIP and system time matters on systems with high resolution
1791	system time. So, convert the input from GIP to System time in that case. */
1792	Assert(ASMGetFlags() & X86_EFL_IF);
1793	const uint64_t u64NowSys = RTTimeSystemNanoTS();
1794	const uint64_t u64NowGip = RTTimeNanoTS();
1795	pGVM->gvmm.s.StatsSched.cHaltWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64NowGip);
1796
1797	/*
1798	* Go to sleep if we must...
1799	* Cap the sleep time to 1 second to be on the safe side.
1800	*/
1801	uint64_t cNsInterval = u64ExpireGipTime - u64NowGip;
1802	if ( u64NowGip < u64ExpireGipTime
1803	&& cNsInterval >= (pGVMM->cEMTs > pGVMM->cEMTsMeansCompany
1804	? pGVMM->nsMinSleepCompany
1805	: pGVMM->nsMinSleepAlone))
1806	{
1807	pGVM->gvmm.s.StatsSched.cHaltBlocking++;
1808	if (cNsInterval > RT_NS_1SEC)
1809	u64ExpireGipTime = u64NowGip + RT_NS_1SEC;
1810	if (u64ExpireGipTime < pGVMM->uNsNextEmtWakeup)
1811	pGVMM->uNsNextEmtWakeup = u64ExpireGipTime;
1812	ASMAtomicWriteU64(&pCurGVCpu->gvmm.s.u64HaltExpire, u64ExpireGipTime);
1813	ASMAtomicIncU32(&pGVMM->cHaltedEMTs);
1814	gvmmR0UsedUnlock(pGVMM);
1815
1816	rc = RTSemEventMultiWaitEx(pCurGVCpu->gvmm.s.HaltEventMulti,
1817	RTSEMWAIT_FLAGS_ABSOLUTE \| RTSEMWAIT_FLAGS_NANOSECS \| RTSEMWAIT_FLAGS_INTERRUPTIBLE,
1818	u64NowGip > u64NowSys ? u64ExpireGipTime : u64NowSys + cNsInterval);
1819
1820	ASMAtomicWriteU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0);
1821	ASMAtomicDecU32(&pGVMM->cHaltedEMTs);
1822
1823	/* Reset the semaphore to try prevent a few false wake-ups. */
1824	if (rc == VINF_SUCCESS)
1825	RTSemEventMultiReset(pCurGVCpu->gvmm.s.HaltEventMulti);
1826	else if (rc == VERR_TIMEOUT)
1827	{
1828	pGVM->gvmm.s.StatsSched.cHaltTimeouts++;
1829	rc = VINF_SUCCESS;
1830	}
1831	}
1832	else
1833	{
1834	pGVM->gvmm.s.StatsSched.cHaltNotBlocking++;
1835	gvmmR0UsedUnlock(pGVMM);
1836	RTSemEventMultiReset(pCurGVCpu->gvmm.s.HaltEventMulti);
1837	}
1838
1839	return rc;
1840	}
1841
1842
1843	/**
1844	* Worker for GVMMR0SchedWakeUp and GVMMR0SchedWakeUpAndPokeCpus that wakes up
1845	* the a sleeping EMT.
1846	*
1847	* @retval VINF_SUCCESS if successfully woken up.
1848	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
1849	*
1850	* @param pGVM The global (ring-0) VM structure.
1851	* @param pGVCpu The global (ring-0) VCPU structure.
1852	*/
1853	DECLINLINE(int) gvmmR0SchedWakeUpOne(PGVM pGVM, PGVMCPU pGVCpu)
1854	{
1855	pGVM->gvmm.s.StatsSched.cWakeUpCalls++;
1856
1857	/*
1858	* Signal the semaphore regardless of whether it's current blocked on it.
1859	*
1860	* The reason for this is that there is absolutely no way we can be 100%
1861	* certain that it isn't about go to go to sleep on it and just got
1862	* delayed a bit en route. So, we will always signal the semaphore when
1863	* the it is flagged as halted in the VMM.
1864	*/
1865	/** @todo we can optimize some of that by means of the pVCpu->enmState now. */
1866	int rc;
1867	if (pGVCpu->gvmm.s.u64HaltExpire)
1868	{
1869	rc = VINF_SUCCESS;
1870	ASMAtomicWriteU64(&pGVCpu->gvmm.s.u64HaltExpire, 0);
1871	}
1872	else
1873	{
1874	rc = VINF_GVM_NOT_BLOCKED;
1875	pGVM->gvmm.s.StatsSched.cWakeUpNotHalted++;
1876	}
1877
1878	int rc2 = RTSemEventMultiSignal(pGVCpu->gvmm.s.HaltEventMulti);
1879	AssertRC(rc2);
1880
1881	return rc;
1882	}
1883
1884
1885	/**
1886	* Wakes up the halted EMT thread so it can service a pending request.
1887	*
1888	* @returns VBox status code.
1889	* @retval VINF_SUCCESS if successfully woken up.
1890	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
1891	*
1892	* @param pVM Pointer to the shared VM structure.
1893	* @param idCpu The Virtual CPU ID of the EMT to wake up.
1894	* @param fTakeUsedLock Take the used lock or not
1895	* @thread Any but EMT.
1896	*/
1897	GVMMR0DECL(int) GVMMR0SchedWakeUpEx(PVM pVM, VMCPUID idCpu, bool fTakeUsedLock)
1898	{
1899	/*
1900	* Validate input and take the UsedLock.
1901	*/
1902	PGVM pGVM;
1903	PGVMM pGVMM;
1904	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, fTakeUsedLock);
1905	if (RT_SUCCESS(rc))
1906	{
1907	if (idCpu < pGVM->cCpus)
1908	{
1909	/*
1910	* Do the actual job.
1911	*/
1912	rc = gvmmR0SchedWakeUpOne(pGVM, &pGVM->aCpus[idCpu]);
1913
1914	if (fTakeUsedLock)
1915	{
1916	/*
1917	* While we're here, do a round of scheduling.
1918	*/
1919	Assert(ASMGetFlags() & X86_EFL_IF);
1920	const uint64_t u64Now = RTTimeNanoTS(); /* (GIP time) */
1921	pGVM->gvmm.s.StatsSched.cWakeUpWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64Now);
1922	}
1923	}
1924	else
1925	rc = VERR_INVALID_CPU_ID;
1926
1927	if (fTakeUsedLock)
1928	{
1929	int rc2 = gvmmR0UsedUnlock(pGVMM);
1930	AssertRC(rc2);
1931	}
1932	}
1933
1934	LogFlow(("GVMMR0SchedWakeUp: returns %Rrc\n", rc));
1935	return rc;
1936	}
1937
1938
1939	/**
1940	* Wakes up the halted EMT thread so it can service a pending request.
1941	*
1942	* @returns VBox status code.
1943	* @retval VINF_SUCCESS if successfully woken up.
1944	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
1945	*
1946	* @param pVM Pointer to the shared VM structure.
1947	* @param idCpu The Virtual CPU ID of the EMT to wake up.
1948	* @thread Any but EMT.
1949	*/
1950	GVMMR0DECL(int) GVMMR0SchedWakeUp(PVM pVM, VMCPUID idCpu)
1951	{
1952	return GVMMR0SchedWakeUpEx(pVM, idCpu, true /* fTakeUsedLock */);
1953	}
1954
1955	/**
1956	* Worker common to GVMMR0SchedPoke and GVMMR0SchedWakeUpAndPokeCpus that pokes
1957	* the Virtual CPU if it's still busy executing guest code.
1958	*
1959	* @returns VBox status code.
1960	* @retval VINF_SUCCESS if poked successfully.
1961	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
1962	*
1963	* @param pGVM The global (ring-0) VM structure.
1964	* @param pVCpu The Virtual CPU handle.
1965	*/
1966	DECLINLINE(int) gvmmR0SchedPokeOne(PGVM pGVM, PVMCPU pVCpu)
1967	{
1968	pGVM->gvmm.s.StatsSched.cPokeCalls++;
1969
1970	RTCPUID idHostCpu = pVCpu->idHostCpu;
1971	if ( idHostCpu == NIL_RTCPUID
1972	\|\| VMCPU_GET_STATE(pVCpu) != VMCPUSTATE_STARTED_EXEC)
1973	{
1974	pGVM->gvmm.s.StatsSched.cPokeNotBusy++;
1975	return VINF_GVM_NOT_BUSY_IN_GC;
1976	}
1977
1978	/* Note: this function is not implemented on Darwin and Linux (kernel < 2.6.19) */
1979	RTMpPokeCpu(idHostCpu);
1980	return VINF_SUCCESS;
1981	}
1982
1983	/**
1984	* Pokes an EMT if it's still busy running guest code.
1985	*
1986	* @returns VBox status code.
1987	* @retval VINF_SUCCESS if poked successfully.
1988	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
1989	*
1990	* @param pVM Pointer to the shared VM structure.
1991	* @param idCpu The ID of the virtual CPU to poke.
1992	* @param fTakeUsedLock Take the used lock or not
1993	*/
1994	GVMMR0DECL(int) GVMMR0SchedPokeEx(PVM pVM, VMCPUID idCpu, bool fTakeUsedLock)
1995	{
1996	/*
1997	* Validate input and take the UsedLock.
1998	*/
1999	PGVM pGVM;
2000	PGVMM pGVMM;
2001	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, fTakeUsedLock);
2002	if (RT_SUCCESS(rc))
2003	{
2004	if (idCpu < pGVM->cCpus)
2005	rc = gvmmR0SchedPokeOne(pGVM, &pVM->aCpus[idCpu]);
2006	else
2007	rc = VERR_INVALID_CPU_ID;
2008
2009	if (fTakeUsedLock)
2010	{
2011	int rc2 = gvmmR0UsedUnlock(pGVMM);
2012	AssertRC(rc2);
2013	}
2014	}
2015
2016	LogFlow(("GVMMR0SchedWakeUpAndPokeCpus: returns %Rrc\n", rc));
2017	return rc;
2018	}
2019
2020
2021	/**
2022	* Pokes an EMT if it's still busy running guest code.
2023	*
2024	* @returns VBox status code.
2025	* @retval VINF_SUCCESS if poked successfully.
2026	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
2027	*
2028	* @param pVM Pointer to the shared VM structure.
2029	* @param idCpu The ID of the virtual CPU to poke.
2030	*/
2031	GVMMR0DECL(int) GVMMR0SchedPoke(PVM pVM, VMCPUID idCpu)
2032	{
2033	return GVMMR0SchedPokeEx(pVM, idCpu, true /* fTakeUsedLock */);
2034	}
2035
2036
2037	/**
2038	* Wakes up a set of halted EMT threads so they can service pending request.
2039	*
2040	* @returns VBox status code, no informational stuff.
2041	*
2042	* @param pVM Pointer to the shared VM structure.
2043	* @param pSleepSet The set of sleepers to wake up.
2044	* @param pPokeSet The set of CPUs to poke.
2045	*/
2046	GVMMR0DECL(int) GVMMR0SchedWakeUpAndPokeCpus(PVM pVM, PCVMCPUSET pSleepSet, PCVMCPUSET pPokeSet)
2047	{
2048	AssertPtrReturn(pSleepSet, VERR_INVALID_POINTER);
2049	AssertPtrReturn(pPokeSet, VERR_INVALID_POINTER);
2050	RTNATIVETHREAD hSelf = RTThreadNativeSelf();
2051
2052	/*
2053	* Validate input and take the UsedLock.
2054	*/
2055	PGVM pGVM;
2056	PGVMM pGVMM;
2057	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, true /* fTakeUsedLock */);
2058	if (RT_SUCCESS(rc))
2059	{
2060	rc = VINF_SUCCESS;
2061	VMCPUID idCpu = pGVM->cCpus;
2062	while (idCpu-- > 0)
2063	{
2064	/* Don't try poke or wake up ourselves. */
2065	if (pGVM->aCpus[idCpu].hEMT == hSelf)
2066	continue;
2067
2068	/* just ignore errors for now. */
2069	if (VMCPUSET_IS_PRESENT(pSleepSet, idCpu))
2070	gvmmR0SchedWakeUpOne(pGVM, &pGVM->aCpus[idCpu]);
2071	else if (VMCPUSET_IS_PRESENT(pPokeSet, idCpu))
2072	gvmmR0SchedPokeOne(pGVM, &pVM->aCpus[idCpu]);
2073	}
2074
2075	int rc2 = gvmmR0UsedUnlock(pGVMM);
2076	AssertRC(rc2);
2077	}
2078
2079	LogFlow(("GVMMR0SchedWakeUpAndPokeCpus: returns %Rrc\n", rc));
2080	return rc;
2081	}
2082
2083
2084	/**
2085	* VMMR0 request wrapper for GVMMR0SchedWakeUpAndPokeCpus.
2086	*
2087	* @returns see GVMMR0SchedWakeUpAndPokeCpus.
2088	* @param pVM Pointer to the shared VM structure.
2089	* @param pReq The request packet.
2090	*/
2091	GVMMR0DECL(int) GVMMR0SchedWakeUpAndPokeCpusReq(PVM pVM, PGVMMSCHEDWAKEUPANDPOKECPUSREQ pReq)
2092	{
2093	/*
2094	* Validate input and pass it on.
2095	*/
2096	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
2097	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
2098
2099	return GVMMR0SchedWakeUpAndPokeCpus(pVM, &pReq->SleepSet, &pReq->PokeSet);
2100	}
2101
2102
2103
2104	/**
2105	* Poll the schedule to see if someone else should get a chance to run.
2106	*
2107	* This is a bit hackish and will not work too well if the machine is
2108	* under heavy load from non-VM processes.
2109	*
2110	* @returns VINF_SUCCESS if not yielded.
2111	* VINF_GVM_YIELDED if an attempt to switch to a different VM task was made.
2112	* @param pVM Pointer to the shared VM structure.
2113	* @param idCpu The Virtual CPU ID of the calling EMT.
2114	* @param u64ExpireGipTime The time for the sleep to expire expressed as GIP time.
2115	* @param fYield Whether to yield or not.
2116	* This is for when we're spinning in the halt loop.
2117	* @thread EMT(idCpu).
2118	*/
2119	GVMMR0DECL(int) GVMMR0SchedPoll(PVM pVM, VMCPUID idCpu, bool fYield)
2120	{
2121	/*
2122	* Validate input.
2123	*/
2124	PGVM pGVM;
2125	PGVMM pGVMM;
2126	int rc = gvmmR0ByVMAndEMT(pVM, idCpu, &pGVM, &pGVMM);
2127	if (RT_SUCCESS(rc))
2128	{
2129	rc = gvmmR0UsedLock(pGVMM);
2130	AssertRC(rc);
2131	pGVM->gvmm.s.StatsSched.cPollCalls++;
2132
2133	Assert(ASMGetFlags() & X86_EFL_IF);
2134	const uint64_t u64Now = RTTimeNanoTS(); /* (GIP time) */
2135
2136	if (!fYield)
2137	pGVM->gvmm.s.StatsSched.cPollWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64Now);
2138	else
2139	{
2140	/** @todo implement this... */
2141	rc = VERR_NOT_IMPLEMENTED;
2142	}
2143
2144	gvmmR0UsedUnlock(pGVMM);
2145	}
2146
2147	LogFlow(("GVMMR0SchedWakeUp: returns %Rrc\n", rc));
2148	return rc;
2149	}
2150
2151
2152	#ifdef GVMM_SCHED_WITH_PPT
2153	/**
2154	* Timer callback for the periodic preemption timer.
2155	*
2156	* @param pTimer The timer handle.
2157	* @param pvUser Pointer to the per cpu structure.
2158	* @param iTick The current tick.
2159	*/
2160	static DECLCALLBACK(void) gvmmR0SchedPeriodicPreemptionTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
2161	{
2162	PGVMMHOSTCPU pCpu = (PGVMMHOSTCPU)pvUser;
2163	NOREF(pTimer); NOREF(iTick);
2164
2165	/*
2166	* Termination check
2167	*/
2168	if (pCpu->u32Magic != GVMMHOSTCPU_MAGIC)
2169	return;
2170
2171	/*
2172	* Do the house keeping.
2173	*/
2174	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
2175
2176	if (++pCpu->Ppt.iTickHistorization >= pCpu->Ppt.cTicksHistoriziationInterval)
2177	{
2178	/*
2179	* Historicize the max frequency.
2180	*/
2181	uint32_t iHzHistory = ++pCpu->Ppt.iHzHistory % RT_ELEMENTS(pCpu->Ppt.aHzHistory);
2182	pCpu->Ppt.aHzHistory[iHzHistory] = pCpu->Ppt.uDesiredHz;
2183	pCpu->Ppt.iTickHistorization = 0;
2184	pCpu->Ppt.uDesiredHz = 0;
2185
2186	/*
2187	* Check if the current timer frequency.
2188	*/
2189	uint32_t uHistMaxHz = 0;
2190	for (uint32_t i = 0; i < RT_ELEMENTS(pCpu->Ppt.aHzHistory); i++)
2191	if (pCpu->Ppt.aHzHistory[i] > uHistMaxHz)
2192	uHistMaxHz = pCpu->Ppt.aHzHistory[i];
2193	if (uHistMaxHz == pCpu->Ppt.uTimerHz)
2194	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2195	else if (uHistMaxHz)
2196	{
2197	/*
2198	* Reprogram it.
2199	*/
2200	pCpu->Ppt.cChanges++;
2201	pCpu->Ppt.iTickHistorization = 0;
2202	pCpu->Ppt.uTimerHz = uHistMaxHz;
2203	uint32_t const cNsInterval = RT_NS_1SEC / uHistMaxHz;
2204	pCpu->Ppt.cNsInterval = cNsInterval;
2205	if (cNsInterval < GVMMHOSTCPU_PPT_HIST_INTERVAL_NS)
2206	pCpu->Ppt.cTicksHistoriziationInterval = ( GVMMHOSTCPU_PPT_HIST_INTERVAL_NS
2207	+ GVMMHOSTCPU_PPT_HIST_INTERVAL_NS / 2 - 1)
2208	/ cNsInterval;
2209	else
2210	pCpu->Ppt.cTicksHistoriziationInterval = 1;
2211	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2212
2213	/SUPR0Printf("Cpu%u: change to %u Hz / %u ns\n", pCpu->idxCpuSet, uHistMaxHz, cNsInterval);/
2214	RTTimerChangeInterval(pTimer, cNsInterval);
2215	}
2216	else
2217	{
2218	/*
2219	* Stop it.
2220	*/
2221	pCpu->Ppt.fStarted = false;
2222	pCpu->Ppt.uTimerHz = 0;
2223	pCpu->Ppt.cNsInterval = 0;
2224	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2225
2226	/SUPR0Printf("Cpu%u: stopping (%u Hz)\n", pCpu->idxCpuSet, uHistMaxHz);/
2227	RTTimerStop(pTimer);
2228	}
2229	}
2230	else
2231	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2232	}
2233	#endif /* GVMM_SCHED_WITH_PPT */
2234
2235
2236	/**
2237	* Updates the periodic preemption timer for the calling CPU.
2238	*
2239	* The caller must have disabled preemption!
2240	* The caller must check that the host can do high resolution timers.
2241	*
2242	* @param pVM The VM handle.
2243	* @param idHostCpu The current host CPU id.
2244	* @param uHz The desired frequency.
2245	*/
2246	GVMMR0DECL(void) GVMMR0SchedUpdatePeriodicPreemptionTimer(PVM pVM, RTCPUID idHostCpu, uint32_t uHz)
2247	{
2248	NOREF(pVM);
2249	#ifdef GVMM_SCHED_WITH_PPT
2250	Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
2251	Assert(RTTimerCanDoHighResolution());
2252
2253	/*
2254	* Resolve the per CPU data.
2255	*/
2256	uint32_t iCpu = RTMpCpuIdToSetIndex(idHostCpu);
2257	PGVMM pGVMM = g_pGVMM;
2258	if ( !VALID_PTR(pGVMM)
2259	\|\| pGVMM->u32Magic != GVMM_MAGIC)
2260	return;
2261	AssertMsgReturnVoid(iCpu < pGVMM->cHostCpus, ("iCpu=%d cHostCpus=%d\n", iCpu, pGVMM->cHostCpus));
2262	PGVMMHOSTCPU pCpu = &pGVMM->aHostCpus[iCpu];
2263	AssertMsgReturnVoid( pCpu->u32Magic == GVMMHOSTCPU_MAGIC
2264	&& pCpu->idCpu == idHostCpu,
2265	("u32Magic=%#x idCpu=% idHostCpu=%d\n", pCpu->u32Magic, pCpu->idCpu, idHostCpu));
2266
2267	/*
2268	* Check whether we need to do anything about the timer.
2269	* We have to be a little bit careful since we might be race the timer
2270	* callback here.
2271	*/
2272	if (uHz > 16384)
2273	uHz = 16384; /** @todo add a query method for this! */
2274	if (RT_UNLIKELY( uHz > ASMAtomicReadU32(&pCpu->Ppt.uDesiredHz)
2275	&& uHz >= pCpu->Ppt.uMinHz
2276	&& !pCpu->Ppt.fStarting /* solaris paranoia */))
2277	{
2278	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
2279
2280	pCpu->Ppt.uDesiredHz = uHz;
2281	uint32_t cNsInterval = 0;
2282	if (!pCpu->Ppt.fStarted)
2283	{
2284	pCpu->Ppt.cStarts++;
2285	pCpu->Ppt.fStarted = true;
2286	pCpu->Ppt.fStarting = true;
2287	pCpu->Ppt.iTickHistorization = 0;
2288	pCpu->Ppt.uTimerHz = uHz;
2289	pCpu->Ppt.cNsInterval = cNsInterval = RT_NS_1SEC / uHz;
2290	if (cNsInterval < GVMMHOSTCPU_PPT_HIST_INTERVAL_NS)
2291	pCpu->Ppt.cTicksHistoriziationInterval = ( GVMMHOSTCPU_PPT_HIST_INTERVAL_NS
2292	+ GVMMHOSTCPU_PPT_HIST_INTERVAL_NS / 2 - 1)
2293	/ cNsInterval;
2294	else
2295	pCpu->Ppt.cTicksHistoriziationInterval = 1;
2296	}
2297
2298	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2299
2300	if (cNsInterval)
2301	{
2302	RTTimerChangeInterval(pCpu->Ppt.pTimer, cNsInterval);
2303	int rc = RTTimerStart(pCpu->Ppt.pTimer, cNsInterval);
2304	AssertRC(rc);
2305
2306	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
2307	if (RT_FAILURE(rc))
2308	pCpu->Ppt.fStarted = false;
2309	pCpu->Ppt.fStarting = false;
2310	RTSpinlockReleaseNoInts(pCpu->Ppt.hSpinlock);
2311	}
2312	}
2313	#else /* !GVMM_SCHED_WITH_PPT */
2314	NOREF(idHostCpu); NOREF(uHz);
2315	#endif /* !GVMM_SCHED_WITH_PPT */
2316	}
2317
2318
2319	/**
2320	* Retrieves the GVMM statistics visible to the caller.
2321	*
2322	* @returns VBox status code.
2323	*
2324	* @param pStats Where to put the statistics.
2325	* @param pSession The current session.
2326	* @param pVM The VM to obtain statistics for. Optional.
2327	*/
2328	GVMMR0DECL(int) GVMMR0QueryStatistics(PGVMMSTATS pStats, PSUPDRVSESSION pSession, PVM pVM)
2329	{
2330	LogFlow(("GVMMR0QueryStatistics: pStats=%p pSession=%p pVM=%p\n", pStats, pSession, pVM));
2331
2332	/*
2333	* Validate input.
2334	*/
2335	AssertPtrReturn(pSession, VERR_INVALID_POINTER);
2336	AssertPtrReturn(pStats, VERR_INVALID_POINTER);
2337	pStats->cVMs = 0; /* (crash before taking the sem...) */
2338
2339	/*
2340	* Take the lock and get the VM statistics.
2341	*/
2342	PGVMM pGVMM;
2343	if (pVM)
2344	{
2345	PGVM pGVM;
2346	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, true /fTakeUsedLock/);
2347	if (RT_FAILURE(rc))
2348	return rc;
2349	pStats->SchedVM = pGVM->gvmm.s.StatsSched;
2350	}
2351	else
2352	{
2353	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
2354	memset(&pStats->SchedVM, 0, sizeof(pStats->SchedVM));
2355
2356	int rc = gvmmR0UsedLock(pGVMM);
2357	AssertRCReturn(rc, rc);
2358	}
2359
2360	/*
2361	* Enumerate the VMs and add the ones visible to the statistics.
2362	*/
2363	pStats->cVMs = 0;
2364	pStats->cEMTs = 0;
2365	memset(&pStats->SchedSum, 0, sizeof(pStats->SchedSum));
2366
2367	for (unsigned i = pGVMM->iUsedHead;
2368	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
2369	i = pGVMM->aHandles[i].iNext)
2370	{
2371	PGVM pGVM = pGVMM->aHandles[i].pGVM;
2372	void *pvObj = pGVMM->aHandles[i].pvObj;
2373	if ( VALID_PTR(pvObj)
2374	&& VALID_PTR(pGVM)
2375	&& pGVM->u32Magic == GVM_MAGIC
2376	&& RT_SUCCESS(SUPR0ObjVerifyAccess(pvObj, pSession, NULL)))
2377	{
2378	pStats->cVMs++;
2379	pStats->cEMTs += pGVM->cCpus;
2380
2381	pStats->SchedSum.cHaltCalls += pGVM->gvmm.s.StatsSched.cHaltCalls;
2382	pStats->SchedSum.cHaltBlocking += pGVM->gvmm.s.StatsSched.cHaltBlocking;
2383	pStats->SchedSum.cHaltTimeouts += pGVM->gvmm.s.StatsSched.cHaltTimeouts;
2384	pStats->SchedSum.cHaltNotBlocking += pGVM->gvmm.s.StatsSched.cHaltNotBlocking;
2385	pStats->SchedSum.cHaltWakeUps += pGVM->gvmm.s.StatsSched.cHaltWakeUps;
2386
2387	pStats->SchedSum.cWakeUpCalls += pGVM->gvmm.s.StatsSched.cWakeUpCalls;
2388	pStats->SchedSum.cWakeUpNotHalted += pGVM->gvmm.s.StatsSched.cWakeUpNotHalted;
2389	pStats->SchedSum.cWakeUpWakeUps += pGVM->gvmm.s.StatsSched.cWakeUpWakeUps;
2390
2391	pStats->SchedSum.cPokeCalls += pGVM->gvmm.s.StatsSched.cPokeCalls;
2392	pStats->SchedSum.cPokeNotBusy += pGVM->gvmm.s.StatsSched.cPokeNotBusy;
2393
2394	pStats->SchedSum.cPollCalls += pGVM->gvmm.s.StatsSched.cPollCalls;
2395	pStats->SchedSum.cPollHalts += pGVM->gvmm.s.StatsSched.cPollHalts;
2396	pStats->SchedSum.cPollWakeUps += pGVM->gvmm.s.StatsSched.cPollWakeUps;
2397	}
2398	}
2399
2400	/*
2401	* Copy out the per host CPU statistics.
2402	*/
2403	uint32_t iDstCpu = 0;
2404	uint32_t cSrcCpus = pGVMM->cHostCpus;
2405	for (uint32_t iSrcCpu = 0; iSrcCpu < cSrcCpus; iSrcCpu++)
2406	{
2407	if (pGVMM->aHostCpus[iSrcCpu].idCpu != NIL_RTCPUID)
2408	{
2409	pStats->aHostCpus[iDstCpu].idCpu = pGVMM->aHostCpus[iSrcCpu].idCpu;
2410	pStats->aHostCpus[iDstCpu].idxCpuSet = pGVMM->aHostCpus[iSrcCpu].idxCpuSet;
2411	#ifdef GVMM_SCHED_WITH_PPT
2412	pStats->aHostCpus[iDstCpu].uDesiredHz = pGVMM->aHostCpus[iSrcCpu].Ppt.uDesiredHz;
2413	pStats->aHostCpus[iDstCpu].uTimerHz = pGVMM->aHostCpus[iSrcCpu].Ppt.uTimerHz;
2414	pStats->aHostCpus[iDstCpu].cChanges = pGVMM->aHostCpus[iSrcCpu].Ppt.cChanges;
2415	pStats->aHostCpus[iDstCpu].cStarts = pGVMM->aHostCpus[iSrcCpu].Ppt.cStarts;
2416	#else
2417	pStats->aHostCpus[iDstCpu].uDesiredHz = 0;
2418	pStats->aHostCpus[iDstCpu].uTimerHz = 0;
2419	pStats->aHostCpus[iDstCpu].cChanges = 0;
2420	pStats->aHostCpus[iDstCpu].cStarts = 0;
2421	#endif
2422	iDstCpu++;
2423	if (iDstCpu >= RT_ELEMENTS(pStats->aHostCpus))
2424	break;
2425	}
2426	}
2427	pStats->cHostCpus = iDstCpu;
2428
2429	gvmmR0UsedUnlock(pGVMM);
2430
2431	return VINF_SUCCESS;
2432	}
2433
2434
2435	/**
2436	* VMMR0 request wrapper for GVMMR0QueryStatistics.
2437	*
2438	* @returns see GVMMR0QueryStatistics.
2439	* @param pVM Pointer to the shared VM structure. Optional.
2440	* @param pReq The request packet.
2441	*/
2442	GVMMR0DECL(int) GVMMR0QueryStatisticsReq(PVM pVM, PGVMMQUERYSTATISTICSSREQ pReq)
2443	{
2444	/*
2445	* Validate input and pass it on.
2446	*/
2447	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
2448	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
2449
2450	return GVMMR0QueryStatistics(&pReq->Stats, pReq->pSession, pVM);
2451	}
2452
2453
2454	/**
2455	* Resets the specified GVMM statistics.
2456	*
2457	* @returns VBox status code.
2458	*
2459	* @param pStats Which statistics to reset, that is, non-zero fields indicates which to reset.
2460	* @param pSession The current session.
2461	* @param pVM The VM to reset statistics for. Optional.
2462	*/
2463	GVMMR0DECL(int) GVMMR0ResetStatistics(PCGVMMSTATS pStats, PSUPDRVSESSION pSession, PVM pVM)
2464	{
2465	LogFlow(("GVMMR0ResetStatistics: pStats=%p pSession=%p pVM=%p\n", pStats, pSession, pVM));
2466
2467	/*
2468	* Validate input.
2469	*/
2470	AssertPtrReturn(pSession, VERR_INVALID_POINTER);
2471	AssertPtrReturn(pStats, VERR_INVALID_POINTER);
2472
2473	/*
2474	* Take the lock and get the VM statistics.
2475	*/
2476	PGVMM pGVMM;
2477	if (pVM)
2478	{
2479	PGVM pGVM;
2480	int rc = gvmmR0ByVM(pVM, &pGVM, &pGVMM, true /fTakeUsedLock/);
2481	if (RT_FAILURE(rc))
2482	return rc;
2483	# define MAYBE_RESET_FIELD(field) \
2484	do { if (pStats->SchedVM. field ) { pGVM->gvmm.s.StatsSched. field = 0; } } while (0)
2485	MAYBE_RESET_FIELD(cHaltCalls);
2486	MAYBE_RESET_FIELD(cHaltBlocking);
2487	MAYBE_RESET_FIELD(cHaltTimeouts);
2488	MAYBE_RESET_FIELD(cHaltNotBlocking);
2489	MAYBE_RESET_FIELD(cHaltWakeUps);
2490	MAYBE_RESET_FIELD(cWakeUpCalls);
2491	MAYBE_RESET_FIELD(cWakeUpNotHalted);
2492	MAYBE_RESET_FIELD(cWakeUpWakeUps);
2493	MAYBE_RESET_FIELD(cPokeCalls);
2494	MAYBE_RESET_FIELD(cPokeNotBusy);
2495	MAYBE_RESET_FIELD(cPollCalls);
2496	MAYBE_RESET_FIELD(cPollHalts);
2497	MAYBE_RESET_FIELD(cPollWakeUps);
2498	# undef MAYBE_RESET_FIELD
2499	}
2500	else
2501	{
2502	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
2503
2504	int rc = gvmmR0UsedLock(pGVMM);
2505	AssertRCReturn(rc, rc);
2506	}
2507
2508	/*
2509	* Enumerate the VMs and add the ones visible to the statistics.
2510	*/
2511	if (ASMMemIsAll8(&pStats->SchedSum, sizeof(pStats->SchedSum), 0))
2512	{
2513	for (unsigned i = pGVMM->iUsedHead;
2514	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
2515	i = pGVMM->aHandles[i].iNext)
2516	{
2517	PGVM pGVM = pGVMM->aHandles[i].pGVM;
2518	void *pvObj = pGVMM->aHandles[i].pvObj;
2519	if ( VALID_PTR(pvObj)
2520	&& VALID_PTR(pGVM)
2521	&& pGVM->u32Magic == GVM_MAGIC
2522	&& RT_SUCCESS(SUPR0ObjVerifyAccess(pvObj, pSession, NULL)))
2523	{
2524	# define MAYBE_RESET_FIELD(field) \
2525	do { if (pStats->SchedSum. field ) { pGVM->gvmm.s.StatsSched. field = 0; } } while (0)
2526	MAYBE_RESET_FIELD(cHaltCalls);
2527	MAYBE_RESET_FIELD(cHaltBlocking);
2528	MAYBE_RESET_FIELD(cHaltTimeouts);
2529	MAYBE_RESET_FIELD(cHaltNotBlocking);
2530	MAYBE_RESET_FIELD(cHaltWakeUps);
2531	MAYBE_RESET_FIELD(cWakeUpCalls);
2532	MAYBE_RESET_FIELD(cWakeUpNotHalted);
2533	MAYBE_RESET_FIELD(cWakeUpWakeUps);
2534	MAYBE_RESET_FIELD(cPokeCalls);
2535	MAYBE_RESET_FIELD(cPokeNotBusy);
2536	MAYBE_RESET_FIELD(cPollCalls);
2537	MAYBE_RESET_FIELD(cPollHalts);
2538	MAYBE_RESET_FIELD(cPollWakeUps);
2539	# undef MAYBE_RESET_FIELD
2540	}
2541	}
2542	}
2543
2544	gvmmR0UsedUnlock(pGVMM);
2545
2546	return VINF_SUCCESS;
2547	}
2548
2549
2550	/**
2551	* VMMR0 request wrapper for GVMMR0ResetStatistics.
2552	*
2553	* @returns see GVMMR0ResetStatistics.
2554	* @param pVM Pointer to the shared VM structure. Optional.
2555	* @param pReq The request packet.
2556	*/
2557	GVMMR0DECL(int) GVMMR0ResetStatisticsReq(PVM pVM, PGVMMRESETSTATISTICSSREQ pReq)
2558	{
2559	/*
2560	* Validate input and pass it on.
2561	*/
2562	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
2563	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
2564
2565	return GVMMR0ResetStatistics(&pReq->Stats, pReq->pSession, pVM);
2566	}
2567

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source: vbox/trunk/src/VBox/VMM/VMMR0/GVMMR0.cpp@ 41309

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