GVMMR0.cpp@ 101521

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1	/* $Id: GVMMR0.cpp 100927 2023-08-21 19:42:52Z vboxsync $ */
2	/** @file
3	* GVMM - Global VM Manager.
4	*/
5
6	/*
7	* Copyright (C) 2007-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/** @page pg_gvmm GVMM - The Global VM Manager
30	*
31	* The Global VM Manager lives in ring-0. Its main function at the moment is
32	* to manage a list of all running VMs, keep a ring-0 only structure (GVM) for
33	* each of them, and assign them unique identifiers (so GMM can track page
34	* owners). The GVMM also manage some of the host CPU resources, like the
35	* periodic preemption timer.
36	*
37	* The GVMM will create a ring-0 object for each VM when it is registered, this
38	* is both for session cleanup purposes and for having a point where it is
39	* possible to implement usage polices later (in SUPR0ObjRegister).
40	*
41	*
42	* @section sec_gvmm_ppt Periodic Preemption Timer (PPT)
43	*
44	* On system that sports a high resolution kernel timer API, we use per-cpu
45	* timers to generate interrupts that preempts VT-x, AMD-V and raw-mode guest
46	* execution. The timer frequency is calculating by taking the max
47	* TMCalcHostTimerFrequency for all VMs running on a CPU for the last ~160 ms
48	* (RT_ELEMENTS((PGVMMHOSTCPU)0, Ppt.aHzHistory) *
49	* GVMMHOSTCPU_PPT_HIST_INTERVAL_NS).
50	*
51	* The TMCalcHostTimerFrequency() part of the things gets its takes the max
52	* TMTimerSetFrequencyHint() value and adjusts by the current catch-up percent,
53	* warp drive percent and some fudge factors. VMMR0.cpp reports the result via
54	* GVMMR0SchedUpdatePeriodicPreemptionTimer() before switching to the VT-x,
55	* AMD-V and raw-mode execution environments.
56	*/
57
58
59	/*********************************************************************************************************************************
60	* Header Files *
61	*********************************************************************************************************************************/
62	#define LOG_GROUP LOG_GROUP_GVMM
63	#include <VBox/vmm/gvmm.h>
64	#include <VBox/vmm/gmm.h>
65	#include "GVMMR0Internal.h"
66	#include <VBox/vmm/dbgf.h>
67	#include <VBox/vmm/iom.h>
68	#include <VBox/vmm/pdm.h>
69	#include <VBox/vmm/pgm.h>
70	#include <VBox/vmm/vmm.h>
71	#ifdef VBOX_WITH_NEM_R0
72	# include <VBox/vmm/nem.h>
73	#endif
74	#include <VBox/vmm/vmcpuset.h>
75	#include <VBox/vmm/vmcc.h>
76	#include <VBox/param.h>
77	#include <VBox/err.h>
78
79	#include <iprt/asm.h>
80	#include <iprt/asm-amd64-x86.h>
81	#include <iprt/critsect.h>
82	#include <iprt/mem.h>
83	#include <iprt/semaphore.h>
84	#include <iprt/time.h>
85	#include <VBox/log.h>
86	#include <iprt/thread.h>
87	#include <iprt/process.h>
88	#include <iprt/param.h>
89	#include <iprt/string.h>
90	#include <iprt/assert.h>
91	#include <iprt/mem.h>
92	#include <iprt/memobj.h>
93	#include <iprt/mp.h>
94	#include <iprt/cpuset.h>
95	#include <iprt/spinlock.h>
96	#include <iprt/timer.h>
97
98	#include "dtrace/VBoxVMM.h"
99
100
101	/*********************************************************************************************************************************
102	* Defined Constants And Macros *
103	*********************************************************************************************************************************/
104	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_SOLARIS) \|\| defined(RT_OS_WINDOWS) \|\| defined(DOXYGEN_RUNNING)
105	/** Define this to enable the periodic preemption timer. */
106	# define GVMM_SCHED_WITH_PPT
107	#endif
108
109	#if /defined(RT_OS_WINDOWS) \|\|/ defined(DOXYGEN_RUNNING)
110	/** Define this to enable the per-EMT high resolution wakeup timers. */
111	# define GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
112	#endif
113
114
115	/** Special value that GVMMR0DeregisterVCpu sets. */
116	#define GVMM_RTNATIVETHREAD_DESTROYED (~(RTNATIVETHREAD)1)
117	AssertCompile(GVMM_RTNATIVETHREAD_DESTROYED != NIL_RTNATIVETHREAD);
118
119
120	/*********************************************************************************************************************************
121	* Structures and Typedefs *
122	*********************************************************************************************************************************/
123
124	/**
125	* Global VM handle.
126	*/
127	typedef struct GVMHANDLE
128	{
129	/** The index of the next handle in the list (free or used). (0 is nil.) */
130	uint16_t volatile iNext;
131	/** Our own index / handle value. */
132	uint16_t iSelf;
133	/** The process ID of the handle owner.
134	* This is used for access checks. */
135	RTPROCESS ProcId;
136	/** The pointer to the ring-0 only (aka global) VM structure. */
137	PGVM pGVM;
138	/** The virtual machine object. */
139	void *pvObj;
140	/** The session this VM is associated with. */
141	PSUPDRVSESSION pSession;
142	/** The ring-0 handle of the EMT0 thread.
143	* This is used for ownership checks as well as looking up a VM handle by thread
144	* at times like assertions. */
145	RTNATIVETHREAD hEMT0;
146	} GVMHANDLE;
147	/** Pointer to a global VM handle. */
148	typedef GVMHANDLE *PGVMHANDLE;
149
150	/** Number of GVM handles (including the NIL handle). */
151	#if HC_ARCH_BITS == 64
152	# define GVMM_MAX_HANDLES 8192
153	#else
154	# define GVMM_MAX_HANDLES 128
155	#endif
156
157	/**
158	* Per host CPU GVMM data.
159	*/
160	typedef struct GVMMHOSTCPU
161	{
162	/** Magic number (GVMMHOSTCPU_MAGIC). */
163	uint32_t volatile u32Magic;
164	/** The CPU ID. */
165	RTCPUID idCpu;
166	/** The CPU set index. */
167	uint32_t idxCpuSet;
168
169	#ifdef GVMM_SCHED_WITH_PPT
170	/** Periodic preemption timer data. */
171	struct
172	{
173	/** The handle to the periodic preemption timer. */
174	PRTTIMER pTimer;
175	/** Spinlock protecting the data below. */
176	RTSPINLOCK hSpinlock;
177	/** The smalles Hz that we need to care about. (static) */
178	uint32_t uMinHz;
179	/** The number of ticks between each historization. */
180	uint32_t cTicksHistoriziationInterval;
181	/** The current historization tick (counting up to
182	* cTicksHistoriziationInterval and then resetting). */
183	uint32_t iTickHistorization;
184	/** The current timer interval. This is set to 0 when inactive. */
185	uint32_t cNsInterval;
186	/** The current timer frequency. This is set to 0 when inactive. */
187	uint32_t uTimerHz;
188	/** The current max frequency reported by the EMTs.
189	* This gets historicize and reset by the timer callback. This is
190	* read without holding the spinlock, so needs atomic updating. */
191	uint32_t volatile uDesiredHz;
192	/** Whether the timer was started or not. */
193	bool volatile fStarted;
194	/** Set if we're starting timer. */
195	bool volatile fStarting;
196	/** The index of the next history entry (mod it). */
197	uint32_t iHzHistory;
198	/** Historicized uDesiredHz values. The array wraps around, new entries
199	* are added at iHzHistory. This is updated approximately every
200	* GVMMHOSTCPU_PPT_HIST_INTERVAL_NS by the timer callback. */
201	uint32_t aHzHistory[8];
202	/** Statistics counter for recording the number of interval changes. */
203	uint32_t cChanges;
204	/** Statistics counter for recording the number of timer starts. */
205	uint32_t cStarts;
206	} Ppt;
207	#endif /* GVMM_SCHED_WITH_PPT */
208
209	} GVMMHOSTCPU;
210	/** Pointer to the per host CPU GVMM data. */
211	typedef GVMMHOSTCPU *PGVMMHOSTCPU;
212	/** The GVMMHOSTCPU::u32Magic value (Petra, Tanya & Rachel Haden). */
213	#define GVMMHOSTCPU_MAGIC UINT32_C(0x19711011)
214	/** The interval on history entry should cover (approximately) give in
215	* nanoseconds. */
216	#define GVMMHOSTCPU_PPT_HIST_INTERVAL_NS UINT32_C(20000000)
217
218
219	/**
220	* The GVMM instance data.
221	*/
222	typedef struct GVMM
223	{
224	/** Eyecatcher / magic. */
225	uint32_t u32Magic;
226	/** The index of the head of the free handle chain. (0 is nil.) */
227	uint16_t volatile iFreeHead;
228	/** The index of the head of the active handle chain. (0 is nil.) */
229	uint16_t volatile iUsedHead;
230	/** The number of VMs. */
231	uint16_t volatile cVMs;
232	/** Alignment padding. */
233	uint16_t u16Reserved;
234	/** The number of EMTs. */
235	uint32_t volatile cEMTs;
236	/** The number of EMTs that have halted in GVMMR0SchedHalt. */
237	uint32_t volatile cHaltedEMTs;
238	/** Mini lock for restricting early wake-ups to one thread. */
239	bool volatile fDoingEarlyWakeUps;
240	bool afPadding[3]; /*< explicit alignment padding. /
241	/** When the next halted or sleeping EMT will wake up.
242	* This is set to 0 when it needs recalculating and to UINT64_MAX when
243	* there are no halted or sleeping EMTs in the GVMM. */
244	uint64_t uNsNextEmtWakeup;
245	/** The lock used to serialize VM creation, destruction and associated events that
246	* isn't performance critical. Owners may acquire the list lock. */
247	RTCRITSECT CreateDestroyLock;
248	/** The lock used to serialize used list updates and accesses.
249	* This indirectly includes scheduling since the scheduler will have to walk the
250	* used list to examin running VMs. Owners may not acquire any other locks. */
251	RTCRITSECTRW UsedLock;
252	/** The handle array.
253	* The size of this array defines the maximum number of currently running VMs.
254	* The first entry is unused as it represents the NIL handle. */
255	GVMHANDLE aHandles[GVMM_MAX_HANDLES];
256
257	/** @gcfgm{/GVMM/cEMTsMeansCompany, 32-bit, 0, UINT32_MAX, 1}
258	* The number of EMTs that means we no longer consider ourselves alone on a
259	* CPU/Core.
260	*/
261	uint32_t cEMTsMeansCompany;
262	/** @gcfgm{/GVMM/MinSleepAlone,32-bit, 0, 100000000, 750000, ns}
263	* The minimum sleep time for when we're alone, in nano seconds.
264	*/
265	uint32_t nsMinSleepAlone;
266	/** @gcfgm{/GVMM/MinSleepCompany,32-bit,0, 100000000, 15000, ns}
267	* The minimum sleep time for when we've got company, in nano seconds.
268	*/
269	uint32_t nsMinSleepCompany;
270	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
271	/** @gcfgm{/GVMM/MinSleepWithHrWakeUp,32-bit,0, 100000000, 5000, ns}
272	* The minimum sleep time for when we've got a high-resolution wake-up timer, in
273	* nano seconds.
274	*/
275	uint32_t nsMinSleepWithHrTimer;
276	#endif
277	/** @gcfgm{/GVMM/EarlyWakeUp1, 32-bit, 0, 100000000, 25000, ns}
278	* The limit for the first round of early wake-ups, given in nano seconds.
279	*/
280	uint32_t nsEarlyWakeUp1;
281	/** @gcfgm{/GVMM/EarlyWakeUp2, 32-bit, 0, 100000000, 50000, ns}
282	* The limit for the second round of early wake-ups, given in nano seconds.
283	*/
284	uint32_t nsEarlyWakeUp2;
285
286	/** Set if we're doing early wake-ups.
287	* This reflects nsEarlyWakeUp1 and nsEarlyWakeUp2. */
288	bool volatile fDoEarlyWakeUps;
289
290	/** The number of entries in the host CPU array (aHostCpus). */
291	uint32_t cHostCpus;
292	/** Per host CPU data (variable length). */
293	GVMMHOSTCPU aHostCpus[1];
294	} GVMM;
295	AssertCompileMemberAlignment(GVMM, CreateDestroyLock, 8);
296	AssertCompileMemberAlignment(GVMM, UsedLock, 8);
297	AssertCompileMemberAlignment(GVMM, uNsNextEmtWakeup, 8);
298	/** Pointer to the GVMM instance data. */
299	typedef GVMM *PGVMM;
300
301	/** The GVMM::u32Magic value (Charlie Haden). */
302	#define GVMM_MAGIC UINT32_C(0x19370806)
303
304
305
306	/*********************************************************************************************************************************
307	* Global Variables *
308	*********************************************************************************************************************************/
309	/** Pointer to the GVMM instance data.
310	* (Just my general dislike for global variables.) */
311	static PGVMM g_pGVMM = NULL;
312
313	/** Macro for obtaining and validating the g_pGVMM pointer.
314	* On failure it will return from the invoking function with the specified return value.
315	*
316	* @param pGVMM The name of the pGVMM variable.
317	* @param rc The return value on failure. Use VERR_GVMM_INSTANCE for VBox
318	* status codes.
319	*/
320	#define GVMM_GET_VALID_INSTANCE(pGVMM, rc) \
321	do { \
322	(pGVMM) = g_pGVMM;\
323	AssertPtrReturn((pGVMM), (rc)); \
324	AssertMsgReturn((pGVMM)->u32Magic == GVMM_MAGIC, ("%p - %#x\n", (pGVMM), (pGVMM)->u32Magic), (rc)); \
325	} while (0)
326
327	/** Macro for obtaining and validating the g_pGVMM pointer, void function variant.
328	* On failure it will return from the invoking function.
329	*
330	* @param pGVMM The name of the pGVMM variable.
331	*/
332	#define GVMM_GET_VALID_INSTANCE_VOID(pGVMM) \
333	do { \
334	(pGVMM) = g_pGVMM;\
335	AssertPtrReturnVoid((pGVMM)); \
336	AssertMsgReturnVoid((pGVMM)->u32Magic == GVMM_MAGIC, ("%p - %#x\n", (pGVMM), (pGVMM)->u32Magic)); \
337	} while (0)
338
339
340	/*********************************************************************************************************************************
341	* Internal Functions *
342	*********************************************************************************************************************************/
343	static void gvmmR0InitPerVMData(PGVM pGVM, int16_t hSelf, VMCPUID cCpus, PSUPDRVSESSION pSession);
344	static DECLCALLBACK(void) gvmmR0HandleObjDestructor(void pvObj, void pvGVMM, void *pvHandle);
345	static int gvmmR0ByGVM(PGVM pGVM, PGVMM *ppGVMM, bool fTakeUsedLock);
346	static int gvmmR0ByGVMandEMT(PGVM pGVM, VMCPUID idCpu, PGVMM *ppGVMM);
347
348	#ifdef GVMM_SCHED_WITH_PPT
349	static DECLCALLBACK(void) gvmmR0SchedPeriodicPreemptionTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick);
350	#endif
351	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
352	static DECLCALLBACK(void) gvmmR0EmtWakeUpTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick);
353	#endif
354
355
356	/**
357	* Initializes the GVMM.
358	*
359	* This is called while owning the loader semaphore (see supdrvIOCtl_LdrLoad()).
360	*
361	* @returns VBox status code.
362	*/
363	GVMMR0DECL(int) GVMMR0Init(void)
364	{
365	LogFlow(("GVMMR0Init:\n"));
366
367	/*
368	* Allocate and initialize the instance data.
369	*/
370	uint32_t cHostCpus = RTMpGetArraySize();
371	AssertMsgReturn(cHostCpus > 0 && cHostCpus < _64K, ("%d", (int)cHostCpus), VERR_GVMM_HOST_CPU_RANGE);
372
373	PGVMM pGVMM = (PGVMM)RTMemAllocZ(RT_UOFFSETOF_DYN(GVMM, aHostCpus[cHostCpus]));
374	if (!pGVMM)
375	return VERR_NO_MEMORY;
376	int rc = RTCritSectInitEx(&pGVMM->CreateDestroyLock, 0, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE,
377	"GVMM-CreateDestroyLock");
378	if (RT_SUCCESS(rc))
379	{
380	rc = RTCritSectRwInitEx(&pGVMM->UsedLock, 0, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE, "GVMM-UsedLock");
381	if (RT_SUCCESS(rc))
382	{
383	pGVMM->u32Magic = GVMM_MAGIC;
384	pGVMM->iUsedHead = 0;
385	pGVMM->iFreeHead = 1;
386
387	/* the nil handle */
388	pGVMM->aHandles[0].iSelf = 0;
389	pGVMM->aHandles[0].iNext = 0;
390
391	/* the tail */
392	unsigned i = RT_ELEMENTS(pGVMM->aHandles) - 1;
393	pGVMM->aHandles[i].iSelf = i;
394	pGVMM->aHandles[i].iNext = 0; /* nil */
395
396	/* the rest */
397	while (i-- > 1)
398	{
399	pGVMM->aHandles[i].iSelf = i;
400	pGVMM->aHandles[i].iNext = i + 1;
401	}
402
403	/* The default configuration values. */
404	uint32_t cNsResolution = RTSemEventMultiGetResolution();
405	pGVMM->cEMTsMeansCompany = 1; /** @todo should be adjusted to relative to the cpu count or something... */
406	if (cNsResolution >= 5*RT_NS_100US)
407	{
408	pGVMM->nsMinSleepAlone = 750000 /* ns (0.750 ms) /; /* @todo this should be adjusted to be 75% (or something) of the scheduler granularity... */
409	pGVMM->nsMinSleepCompany = 15000 /* ns (0.015 ms) */;
410	pGVMM->nsEarlyWakeUp1 = 25000 /* ns (0.025 ms) */;
411	pGVMM->nsEarlyWakeUp2 = 50000 /* ns (0.050 ms) */;
412	}
413	else if (cNsResolution > RT_NS_100US)
414	{
415	pGVMM->nsMinSleepAlone = cNsResolution / 2;
416	pGVMM->nsMinSleepCompany = cNsResolution / 4;
417	pGVMM->nsEarlyWakeUp1 = 0;
418	pGVMM->nsEarlyWakeUp2 = 0;
419	}
420	else
421	{
422	pGVMM->nsMinSleepAlone = 2000;
423	pGVMM->nsMinSleepCompany = 2000;
424	pGVMM->nsEarlyWakeUp1 = 0;
425	pGVMM->nsEarlyWakeUp2 = 0;
426	}
427	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
428	pGVMM->nsMinSleepWithHrTimer = 5000 /* ns (0.005 ms) */;
429	#endif
430	pGVMM->fDoEarlyWakeUps = pGVMM->nsEarlyWakeUp1 > 0 && pGVMM->nsEarlyWakeUp2 > 0;
431
432	/* The host CPU data. */
433	pGVMM->cHostCpus = cHostCpus;
434	uint32_t iCpu = cHostCpus;
435	RTCPUSET PossibleSet;
436	RTMpGetSet(&PossibleSet);
437	while (iCpu-- > 0)
438	{
439	pGVMM->aHostCpus[iCpu].idxCpuSet = iCpu;
440	#ifdef GVMM_SCHED_WITH_PPT
441	pGVMM->aHostCpus[iCpu].Ppt.pTimer = NULL;
442	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
443	pGVMM->aHostCpus[iCpu].Ppt.uMinHz = 5; /** @todo Add some API which figures this one out. (not that important) */
444	pGVMM->aHostCpus[iCpu].Ppt.cTicksHistoriziationInterval = 1;
445	//pGVMM->aHostCpus[iCpu].Ppt.iTickHistorization = 0;
446	//pGVMM->aHostCpus[iCpu].Ppt.cNsInterval = 0;
447	//pGVMM->aHostCpus[iCpu].Ppt.uTimerHz = 0;
448	//pGVMM->aHostCpus[iCpu].Ppt.uDesiredHz = 0;
449	//pGVMM->aHostCpus[iCpu].Ppt.fStarted = false;
450	//pGVMM->aHostCpus[iCpu].Ppt.fStarting = false;
451	//pGVMM->aHostCpus[iCpu].Ppt.iHzHistory = 0;
452	//pGVMM->aHostCpus[iCpu].Ppt.aHzHistory = {0};
453	#endif
454
455	if (RTCpuSetIsMember(&PossibleSet, iCpu))
456	{
457	pGVMM->aHostCpus[iCpu].idCpu = RTMpCpuIdFromSetIndex(iCpu);
458	pGVMM->aHostCpus[iCpu].u32Magic = GVMMHOSTCPU_MAGIC;
459
460	#ifdef GVMM_SCHED_WITH_PPT
461	rc = RTTimerCreateEx(&pGVMM->aHostCpus[iCpu].Ppt.pTimer,
462	5010001000 /* whatever */,
463	RTTIMER_FLAGS_CPU(iCpu) \| RTTIMER_FLAGS_HIGH_RES,
464	gvmmR0SchedPeriodicPreemptionTimerCallback,
465	&pGVMM->aHostCpus[iCpu]);
466	if (RT_SUCCESS(rc))
467	{
468	rc = RTSpinlockCreate(&pGVMM->aHostCpus[iCpu].Ppt.hSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "GVMM/CPU");
469	if (RT_FAILURE(rc))
470	LogRel(("GVMMR0Init: RTSpinlockCreate failed for #%u (%d)\n", iCpu, rc));
471	}
472	else
473	LogRel(("GVMMR0Init: RTTimerCreateEx failed for #%u (%d)\n", iCpu, rc));
474	if (RT_FAILURE(rc))
475	{
476	while (iCpu < cHostCpus)
477	{
478	RTTimerDestroy(pGVMM->aHostCpus[iCpu].Ppt.pTimer);
479	RTSpinlockDestroy(pGVMM->aHostCpus[iCpu].Ppt.hSpinlock);
480	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
481	iCpu++;
482	}
483	break;
484	}
485	#endif
486	}
487	else
488	{
489	pGVMM->aHostCpus[iCpu].idCpu = NIL_RTCPUID;
490	pGVMM->aHostCpus[iCpu].u32Magic = 0;
491	}
492	}
493	if (RT_SUCCESS(rc))
494	{
495	g_pGVMM = pGVMM;
496	LogFlow(("GVMMR0Init: pGVMM=%p cHostCpus=%u\n", pGVMM, cHostCpus));
497	return VINF_SUCCESS;
498	}
499
500	/* bail out. */
501	RTCritSectRwDelete(&pGVMM->UsedLock);
502	}
503	else
504	LogRel(("GVMMR0Init: RTCritSectRwInitEx failed (%d)\n", rc));
505	RTCritSectDelete(&pGVMM->CreateDestroyLock);
506	}
507	else
508	LogRel(("GVMMR0Init: RTCritSectInitEx failed (%d)\n", rc));
509
510	RTMemFree(pGVMM);
511	return rc;
512	}
513
514
515	/**
516	* Terminates the GVM.
517	*
518	* This is called while owning the loader semaphore (see supdrvLdrFree()).
519	* And unless something is wrong, there should be absolutely no VMs
520	* registered at this point.
521	*/
522	GVMMR0DECL(void) GVMMR0Term(void)
523	{
524	LogFlow(("GVMMR0Term:\n"));
525
526	PGVMM pGVMM = g_pGVMM;
527	g_pGVMM = NULL;
528	if (RT_UNLIKELY(!RT_VALID_PTR(pGVMM)))
529	{
530	SUPR0Printf("GVMMR0Term: pGVMM=%RKv\n", pGVMM);
531	return;
532	}
533
534	/*
535	* First of all, stop all active timers.
536	*/
537	uint32_t cActiveTimers = 0;
538	uint32_t iCpu = pGVMM->cHostCpus;
539	while (iCpu-- > 0)
540	{
541	ASMAtomicWriteU32(&pGVMM->aHostCpus[iCpu].u32Magic, ~GVMMHOSTCPU_MAGIC);
542	#ifdef GVMM_SCHED_WITH_PPT
543	if ( pGVMM->aHostCpus[iCpu].Ppt.pTimer != NULL
544	&& RT_SUCCESS(RTTimerStop(pGVMM->aHostCpus[iCpu].Ppt.pTimer)))
545	cActiveTimers++;
546	#endif
547	}
548	if (cActiveTimers)
549	RTThreadSleep(1); /* fudge */
550
551	/*
552	* Invalidate the and free resources.
553	*/
554	pGVMM->u32Magic = ~GVMM_MAGIC;
555	RTCritSectRwDelete(&pGVMM->UsedLock);
556	RTCritSectDelete(&pGVMM->CreateDestroyLock);
557
558	pGVMM->iFreeHead = 0;
559	if (pGVMM->iUsedHead)
560	{
561	SUPR0Printf("GVMMR0Term: iUsedHead=%#x! (cVMs=%#x cEMTs=%#x)\n", pGVMM->iUsedHead, pGVMM->cVMs, pGVMM->cEMTs);
562	pGVMM->iUsedHead = 0;
563	}
564
565	#ifdef GVMM_SCHED_WITH_PPT
566	iCpu = pGVMM->cHostCpus;
567	while (iCpu-- > 0)
568	{
569	RTTimerDestroy(pGVMM->aHostCpus[iCpu].Ppt.pTimer);
570	pGVMM->aHostCpus[iCpu].Ppt.pTimer = NULL;
571	RTSpinlockDestroy(pGVMM->aHostCpus[iCpu].Ppt.hSpinlock);
572	pGVMM->aHostCpus[iCpu].Ppt.hSpinlock = NIL_RTSPINLOCK;
573	}
574	#endif
575
576	RTMemFree(pGVMM);
577	}
578
579
580	/**
581	* A quick hack for setting global config values.
582	*
583	* @returns VBox status code.
584	*
585	* @param pSession The session handle. Used for authentication.
586	* @param pszName The variable name.
587	* @param u64Value The new value.
588	*/
589	GVMMR0DECL(int) GVMMR0SetConfig(PSUPDRVSESSION pSession, const char *pszName, uint64_t u64Value)
590	{
591	/*
592	* Validate input.
593	*/
594	PGVMM pGVMM;
595	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
596	AssertPtrReturn(pSession, VERR_INVALID_HANDLE);
597	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
598
599	/*
600	* String switch time!
601	*/
602	if (strncmp(pszName, RT_STR_TUPLE("/GVMM/")))
603	return VERR_CFGM_VALUE_NOT_FOUND; /* borrow status codes from CFGM... */
604	int rc = VINF_SUCCESS;
605	pszName += sizeof("/GVMM/") - 1;
606	if (!strcmp(pszName, "cEMTsMeansCompany"))
607	{
608	if (u64Value <= UINT32_MAX)
609	pGVMM->cEMTsMeansCompany = u64Value;
610	else
611	rc = VERR_OUT_OF_RANGE;
612	}
613	else if (!strcmp(pszName, "MinSleepAlone"))
614	{
615	if (u64Value <= RT_NS_100MS)
616	pGVMM->nsMinSleepAlone = u64Value;
617	else
618	rc = VERR_OUT_OF_RANGE;
619	}
620	else if (!strcmp(pszName, "MinSleepCompany"))
621	{
622	if (u64Value <= RT_NS_100MS)
623	pGVMM->nsMinSleepCompany = u64Value;
624	else
625	rc = VERR_OUT_OF_RANGE;
626	}
627	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
628	else if (!strcmp(pszName, "MinSleepWithHrWakeUp"))
629	{
630	if (u64Value <= RT_NS_100MS)
631	pGVMM->nsMinSleepWithHrTimer = u64Value;
632	else
633	rc = VERR_OUT_OF_RANGE;
634	}
635	#endif
636	else if (!strcmp(pszName, "EarlyWakeUp1"))
637	{
638	if (u64Value <= RT_NS_100MS)
639	{
640	pGVMM->nsEarlyWakeUp1 = u64Value;
641	pGVMM->fDoEarlyWakeUps = pGVMM->nsEarlyWakeUp1 > 0 && pGVMM->nsEarlyWakeUp2 > 0;
642	}
643	else
644	rc = VERR_OUT_OF_RANGE;
645	}
646	else if (!strcmp(pszName, "EarlyWakeUp2"))
647	{
648	if (u64Value <= RT_NS_100MS)
649	{
650	pGVMM->nsEarlyWakeUp2 = u64Value;
651	pGVMM->fDoEarlyWakeUps = pGVMM->nsEarlyWakeUp1 > 0 && pGVMM->nsEarlyWakeUp2 > 0;
652	}
653	else
654	rc = VERR_OUT_OF_RANGE;
655	}
656	else
657	rc = VERR_CFGM_VALUE_NOT_FOUND;
658	return rc;
659	}
660
661
662	/**
663	* A quick hack for getting global config values.
664	*
665	* @returns VBox status code.
666	*
667	* @param pSession The session handle. Used for authentication.
668	* @param pszName The variable name.
669	* @param pu64Value Where to return the value.
670	*/
671	GVMMR0DECL(int) GVMMR0QueryConfig(PSUPDRVSESSION pSession, const char pszName, uint64_t pu64Value)
672	{
673	/*
674	* Validate input.
675	*/
676	PGVMM pGVMM;
677	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
678	AssertPtrReturn(pSession, VERR_INVALID_HANDLE);
679	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
680	AssertPtrReturn(pu64Value, VERR_INVALID_POINTER);
681
682	/*
683	* String switch time!
684	*/
685	if (strncmp(pszName, RT_STR_TUPLE("/GVMM/")))
686	return VERR_CFGM_VALUE_NOT_FOUND; /* borrow status codes from CFGM... */
687	int rc = VINF_SUCCESS;
688	pszName += sizeof("/GVMM/") - 1;
689	if (!strcmp(pszName, "cEMTsMeansCompany"))
690	*pu64Value = pGVMM->cEMTsMeansCompany;
691	else if (!strcmp(pszName, "MinSleepAlone"))
692	*pu64Value = pGVMM->nsMinSleepAlone;
693	else if (!strcmp(pszName, "MinSleepCompany"))
694	*pu64Value = pGVMM->nsMinSleepCompany;
695	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
696	else if (!strcmp(pszName, "MinSleepWithHrWakeUp"))
697	*pu64Value = pGVMM->nsMinSleepWithHrTimer;
698	#endif
699	else if (!strcmp(pszName, "EarlyWakeUp1"))
700	*pu64Value = pGVMM->nsEarlyWakeUp1;
701	else if (!strcmp(pszName, "EarlyWakeUp2"))
702	*pu64Value = pGVMM->nsEarlyWakeUp2;
703	else
704	rc = VERR_CFGM_VALUE_NOT_FOUND;
705	return rc;
706	}
707
708
709	/**
710	* Acquire the 'used' lock in shared mode.
711	*
712	* This prevents destruction of the VM while we're in ring-0.
713	*
714	* @returns IPRT status code, see RTSemFastMutexRequest.
715	* @param a_pGVMM The GVMM instance data.
716	* @sa GVMMR0_USED_SHARED_UNLOCK, GVMMR0_USED_EXCLUSIVE_LOCK
717	*/
718	#define GVMMR0_USED_SHARED_LOCK(a_pGVMM) RTCritSectRwEnterShared(&(a_pGVMM)->UsedLock)
719
720	/**
721	* Release the 'used' lock in when owning it in shared mode.
722	*
723	* @returns IPRT status code, see RTSemFastMutexRequest.
724	* @param a_pGVMM The GVMM instance data.
725	* @sa GVMMR0_USED_SHARED_LOCK
726	*/
727	#define GVMMR0_USED_SHARED_UNLOCK(a_pGVMM) RTCritSectRwLeaveShared(&(a_pGVMM)->UsedLock)
728
729	/**
730	* Acquire the 'used' lock in exclusive mode.
731	*
732	* Only use this function when making changes to the used list.
733	*
734	* @returns IPRT status code, see RTSemFastMutexRequest.
735	* @param a_pGVMM The GVMM instance data.
736	* @sa GVMMR0_USED_EXCLUSIVE_UNLOCK
737	*/
738	#define GVMMR0_USED_EXCLUSIVE_LOCK(a_pGVMM) RTCritSectRwEnterExcl(&(a_pGVMM)->UsedLock)
739
740	/**
741	* Release the 'used' lock when owning it in exclusive mode.
742	*
743	* @returns IPRT status code, see RTSemFastMutexRelease.
744	* @param a_pGVMM The GVMM instance data.
745	* @sa GVMMR0_USED_EXCLUSIVE_LOCK, GVMMR0_USED_SHARED_UNLOCK
746	*/
747	#define GVMMR0_USED_EXCLUSIVE_UNLOCK(a_pGVMM) RTCritSectRwLeaveExcl(&(a_pGVMM)->UsedLock)
748
749
750	/**
751	* Try acquire the 'create & destroy' lock.
752	*
753	* @returns IPRT status code, see RTSemFastMutexRequest.
754	* @param pGVMM The GVMM instance data.
755	*/
756	DECLINLINE(int) gvmmR0CreateDestroyLock(PGVMM pGVMM)
757	{
758	LogFlow(("++gvmmR0CreateDestroyLock(%p)\n", pGVMM));
759	int rc = RTCritSectEnter(&pGVMM->CreateDestroyLock);
760	LogFlow(("gvmmR0CreateDestroyLock(%p)->%Rrc\n", pGVMM, rc));
761	return rc;
762	}
763
764
765	/**
766	* Release the 'create & destroy' lock.
767	*
768	* @returns IPRT status code, see RTSemFastMutexRequest.
769	* @param pGVMM The GVMM instance data.
770	*/
771	DECLINLINE(int) gvmmR0CreateDestroyUnlock(PGVMM pGVMM)
772	{
773	LogFlow(("--gvmmR0CreateDestroyUnlock(%p)\n", pGVMM));
774	int rc = RTCritSectLeave(&pGVMM->CreateDestroyLock);
775	AssertRC(rc);
776	return rc;
777	}
778
779
780	/**
781	* Request wrapper for the GVMMR0CreateVM API.
782	*
783	* @returns VBox status code.
784	* @param pReq The request buffer.
785	* @param pSession The session handle. The VM will be associated with this.
786	*/
787	GVMMR0DECL(int) GVMMR0CreateVMReq(PGVMMCREATEVMREQ pReq, PSUPDRVSESSION pSession)
788	{
789	/*
790	* Validate the request.
791	*/
792	if (!RT_VALID_PTR(pReq))
793	return VERR_INVALID_POINTER;
794	if (pReq->Hdr.cbReq != sizeof(*pReq))
795	return VERR_INVALID_PARAMETER;
796	if (pReq->pSession != pSession)
797	return VERR_INVALID_POINTER;
798
799	/*
800	* Execute it.
801	*/
802	PGVM pGVM;
803	pReq->pVMR0 = NULL;
804	pReq->pVMR3 = NIL_RTR3PTR;
805	int rc = GVMMR0CreateVM(pSession, pReq->cCpus, &pGVM);
806	if (RT_SUCCESS(rc))
807	{
808	pReq->pVMR0 = pGVM; /** @todo don't expose this to ring-3, use a unique random number instead. */
809	pReq->pVMR3 = pGVM->pVMR3;
810	}
811	return rc;
812	}
813
814
815	/**
816	* Allocates the VM structure and registers it with GVM.
817	*
818	* The caller will become the VM owner and there by the EMT.
819	*
820	* @returns VBox status code.
821	* @param pSession The support driver session.
822	* @param cCpus Number of virtual CPUs for the new VM.
823	* @param ppGVM Where to store the pointer to the VM structure.
824	*
825	* @thread EMT.
826	*/
827	GVMMR0DECL(int) GVMMR0CreateVM(PSUPDRVSESSION pSession, uint32_t cCpus, PGVM *ppGVM)
828	{
829	LogFlow(("GVMMR0CreateVM: pSession=%p\n", pSession));
830	PGVMM pGVMM;
831	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
832
833	AssertPtrReturn(ppGVM, VERR_INVALID_POINTER);
834	*ppGVM = NULL;
835
836	if ( cCpus == 0
837	\|\| cCpus > VMM_MAX_CPU_COUNT)
838	return VERR_INVALID_PARAMETER;
839
840	RTNATIVETHREAD hEMT0 = RTThreadNativeSelf();
841	AssertReturn(hEMT0 != NIL_RTNATIVETHREAD, VERR_GVMM_BROKEN_IPRT);
842	RTPROCESS ProcId = RTProcSelf();
843	AssertReturn(ProcId != NIL_RTPROCESS, VERR_GVMM_BROKEN_IPRT);
844
845	/*
846	* The whole allocation process is protected by the lock.
847	*/
848	int rc = gvmmR0CreateDestroyLock(pGVMM);
849	AssertRCReturn(rc, rc);
850
851	/*
852	* Only one VM per session.
853	*/
854	if (SUPR0GetSessionVM(pSession) != NULL)
855	{
856	gvmmR0CreateDestroyUnlock(pGVMM);
857	SUPR0Printf("GVMMR0CreateVM: The session %p already got a VM: %p\n", pSession, SUPR0GetSessionVM(pSession));
858	return VERR_ALREADY_EXISTS;
859	}
860
861	/*
862	* Allocate a handle first so we don't waste resources unnecessarily.
863	*/
864	uint16_t iHandle = pGVMM->iFreeHead;
865	if (iHandle)
866	{
867	PGVMHANDLE pHandle = &pGVMM->aHandles[iHandle];
868
869	/* consistency checks, a bit paranoid as always. */
870	if ( !pHandle->pGVM
871	&& !pHandle->pvObj
872	&& pHandle->iSelf == iHandle)
873	{
874	pHandle->pvObj = SUPR0ObjRegister(pSession, SUPDRVOBJTYPE_VM, gvmmR0HandleObjDestructor, pGVMM, pHandle);
875	if (pHandle->pvObj)
876	{
877	/*
878	* Move the handle from the free to used list and perform permission checks.
879	*/
880	rc = GVMMR0_USED_EXCLUSIVE_LOCK(pGVMM);
881	AssertRC(rc);
882
883	pGVMM->iFreeHead = pHandle->iNext;
884	pHandle->iNext = pGVMM->iUsedHead;
885	pGVMM->iUsedHead = iHandle;
886	pGVMM->cVMs++;
887
888	pHandle->pGVM = NULL;
889	pHandle->pSession = pSession;
890	pHandle->hEMT0 = NIL_RTNATIVETHREAD;
891	pHandle->ProcId = NIL_RTPROCESS;
892
893	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
894
895	rc = SUPR0ObjVerifyAccess(pHandle->pvObj, pSession, NULL);
896	if (RT_SUCCESS(rc))
897	{
898	/*
899	* Allocate memory for the VM structure (combined VM + GVM).
900	*/
901	const uint32_t cbVM = RT_UOFFSETOF_DYN(GVM, aCpus[cCpus]);
902	const uint32_t cPages = RT_ALIGN_32(cbVM, HOST_PAGE_SIZE) >> HOST_PAGE_SHIFT;
903	RTR0MEMOBJ hVMMemObj = NIL_RTR0MEMOBJ;
904	rc = RTR0MemObjAllocPage(&hVMMemObj, cPages << HOST_PAGE_SHIFT, false /* fExecutable */);
905	if (RT_SUCCESS(rc))
906	{
907	PGVM pGVM = (PGVM)RTR0MemObjAddress(hVMMemObj);
908	AssertPtr(pGVM);
909
910	/*
911	* Initialise the structure.
912	*/
913	RT_BZERO(pGVM, cPages << HOST_PAGE_SHIFT);
914	gvmmR0InitPerVMData(pGVM, iHandle, cCpus, pSession);
915	pGVM->gvmm.s.VMMemObj = hVMMemObj;
916	rc = GMMR0InitPerVMData(pGVM);
917	int rc2 = PGMR0InitPerVMData(pGVM, hVMMemObj);
918	int rc3 = VMMR0InitPerVMData(pGVM);
919	CPUMR0InitPerVMData(pGVM);
920	DBGFR0InitPerVMData(pGVM);
921	PDMR0InitPerVMData(pGVM);
922	IOMR0InitPerVMData(pGVM);
923	TMR0InitPerVMData(pGVM);
924	if (RT_SUCCESS(rc) && RT_SUCCESS(rc2) && RT_SUCCESS(rc3))
925	{
926	/*
927	* Allocate page array.
928	* This currently have to be made available to ring-3, but this is should change eventually.
929	*/
930	rc = RTR0MemObjAllocPage(&pGVM->gvmm.s.VMPagesMemObj, cPages * sizeof(SUPPAGE), false /* fExecutable */);
931	if (RT_SUCCESS(rc))
932	{
933	PSUPPAGE paPages = (PSUPPAGE)RTR0MemObjAddress(pGVM->gvmm.s.VMPagesMemObj); AssertPtr(paPages);
934	for (uint32_t iPage = 0; iPage < cPages; iPage++)
935	{
936	paPages[iPage].uReserved = 0;
937	paPages[iPage].Phys = RTR0MemObjGetPagePhysAddr(pGVM->gvmm.s.VMMemObj, iPage);
938	Assert(paPages[iPage].Phys != NIL_RTHCPHYS);
939	}
940
941	/*
942	* Map the page array, VM and VMCPU structures into ring-3.
943	*/
944	AssertCompileSizeAlignment(VM, HOST_PAGE_SIZE);
945	rc = RTR0MemObjMapUserEx(&pGVM->gvmm.s.VMMapObj, pGVM->gvmm.s.VMMemObj, (RTR3PTR)-1, 0,
946	RTMEM_PROT_READ \| RTMEM_PROT_WRITE, NIL_RTR0PROCESS,
947	0 /offSub/, sizeof(VM));
948	for (VMCPUID i = 0; i < cCpus && RT_SUCCESS(rc); i++)
949	{
950	AssertCompileSizeAlignment(VMCPU, HOST_PAGE_SIZE);
951	rc = RTR0MemObjMapUserEx(&pGVM->aCpus[i].gvmm.s.VMCpuMapObj, pGVM->gvmm.s.VMMemObj,
952	(RTR3PTR)-1, 0, RTMEM_PROT_READ \| RTMEM_PROT_WRITE, NIL_RTR0PROCESS,
953	RT_UOFFSETOF_DYN(GVM, aCpus[i]), sizeof(VMCPU));
954	}
955	if (RT_SUCCESS(rc))
956	rc = RTR0MemObjMapUser(&pGVM->gvmm.s.VMPagesMapObj, pGVM->gvmm.s.VMPagesMemObj, (RTR3PTR)-1,
957	0 /* uAlignment */, RTMEM_PROT_READ \| RTMEM_PROT_WRITE,
958	NIL_RTR0PROCESS);
959	if (RT_SUCCESS(rc))
960	{
961	/*
962	* Initialize all the VM pointers.
963	*/
964	PVMR3 pVMR3 = RTR0MemObjAddressR3(pGVM->gvmm.s.VMMapObj);
965	AssertMsg(RTR0MemUserIsValidAddr(pVMR3) && pVMR3 != NIL_RTR3PTR, ("%p\n", pVMR3));
966
967	for (VMCPUID i = 0; i < cCpus; i++)
968	{
969	pGVM->aCpus[i].pVMR0 = pGVM;
970	pGVM->aCpus[i].pVMR3 = pVMR3;
971	pGVM->apCpusR3[i] = RTR0MemObjAddressR3(pGVM->aCpus[i].gvmm.s.VMCpuMapObj);
972	pGVM->aCpus[i].pVCpuR3 = pGVM->apCpusR3[i];
973	pGVM->apCpusR0[i] = &pGVM->aCpus[i];
974	AssertMsg(RTR0MemUserIsValidAddr(pGVM->apCpusR3[i]) && pGVM->apCpusR3[i] != NIL_RTR3PTR,
975	("apCpusR3[%u]=%p\n", i, pGVM->apCpusR3[i]));
976	}
977
978	pGVM->paVMPagesR3 = RTR0MemObjAddressR3(pGVM->gvmm.s.VMPagesMapObj);
979	AssertMsg(RTR0MemUserIsValidAddr(pGVM->paVMPagesR3) && pGVM->paVMPagesR3 != NIL_RTR3PTR,
980	("%p\n", pGVM->paVMPagesR3));
981
982	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
983	/*
984	* Create the high resolution wake-up timer for EMT 0, ignore failures.
985	*/
986	if (RTTimerCanDoHighResolution())
987	{
988	int rc4 = RTTimerCreateEx(&pGVM->aCpus[0].gvmm.s.hHrWakeUpTimer,
989	0 /one-shot, no interval/,
990	RTTIMER_FLAGS_HIGH_RES, gvmmR0EmtWakeUpTimerCallback,
991	&pGVM->aCpus[0]);
992	if (RT_FAILURE(rc4))
993	pGVM->aCpus[0].gvmm.s.hHrWakeUpTimer = NULL;
994	}
995	#endif
996
997	/*
998	* Complete the handle - take the UsedLock sem just to be careful.
999	*/
1000	rc = GVMMR0_USED_EXCLUSIVE_LOCK(pGVMM);
1001	AssertRC(rc);
1002
1003	pHandle->pGVM = pGVM;
1004	pHandle->hEMT0 = hEMT0;
1005	pHandle->ProcId = ProcId;
1006	pGVM->pVMR3 = pVMR3;
1007	pGVM->pVMR3Unsafe = pVMR3;
1008	pGVM->aCpus[0].hEMT = hEMT0;
1009	pGVM->aCpus[0].hNativeThreadR0 = hEMT0;
1010	pGVM->aCpus[0].cEmtHashCollisions = 0;
1011	uint32_t const idxHash = GVMM_EMT_HASH_1(hEMT0);
1012	pGVM->aCpus[0].gvmm.s.idxEmtHash = (uint16_t)idxHash;
1013	pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt = hEMT0;
1014	pGVM->gvmm.s.aEmtHash[idxHash].idVCpu = 0;
1015	pGVMM->cEMTs += cCpus;
1016
1017	/* Associate it with the session and create the context hook for EMT0. */
1018	rc = SUPR0SetSessionVM(pSession, pGVM, pGVM);
1019	if (RT_SUCCESS(rc))
1020	{
1021	rc = VMMR0ThreadCtxHookCreateForEmt(&pGVM->aCpus[0]);
1022	if (RT_SUCCESS(rc))
1023	{
1024	/*
1025	* Done!
1026	*/
1027	VBOXVMM_R0_GVMM_VM_CREATED(pGVM, pGVM, ProcId, (void *)hEMT0, cCpus);
1028
1029	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1030	gvmmR0CreateDestroyUnlock(pGVMM);
1031
1032	CPUMR0RegisterVCpuThread(&pGVM->aCpus[0]);
1033
1034	*ppGVM = pGVM;
1035	Log(("GVMMR0CreateVM: pVMR3=%p pGVM=%p hGVM=%d\n", pVMR3, pGVM, iHandle));
1036	return VINF_SUCCESS;
1037	}
1038
1039	SUPR0SetSessionVM(pSession, NULL, NULL);
1040	}
1041	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1042	}
1043
1044	/* Cleanup mappings. */
1045	if (pGVM->gvmm.s.VMMapObj != NIL_RTR0MEMOBJ)
1046	{
1047	RTR0MemObjFree(pGVM->gvmm.s.VMMapObj, false /* fFreeMappings */);
1048	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
1049	}
1050	for (VMCPUID i = 0; i < cCpus; i++)
1051	if (pGVM->aCpus[i].gvmm.s.VMCpuMapObj != NIL_RTR0MEMOBJ)
1052	{
1053	RTR0MemObjFree(pGVM->aCpus[i].gvmm.s.VMCpuMapObj, false /* fFreeMappings */);
1054	pGVM->aCpus[i].gvmm.s.VMCpuMapObj = NIL_RTR0MEMOBJ;
1055	}
1056	if (pGVM->gvmm.s.VMPagesMapObj != NIL_RTR0MEMOBJ)
1057	{
1058	RTR0MemObjFree(pGVM->gvmm.s.VMPagesMapObj, false /* fFreeMappings */);
1059	pGVM->gvmm.s.VMPagesMapObj = NIL_RTR0MEMOBJ;
1060	}
1061	}
1062	}
1063	else
1064	{
1065	if (RT_SUCCESS_NP(rc))
1066	rc = rc2;
1067	if (RT_SUCCESS_NP(rc))
1068	rc = rc3;
1069	AssertStmt(RT_FAILURE_NP(rc), rc = VERR_IPE_UNEXPECTED_STATUS);
1070	}
1071	}
1072	}
1073	/* else: The user wasn't permitted to create this VM. */
1074
1075	/*
1076	* The handle will be freed by gvmmR0HandleObjDestructor as we release the
1077	* object reference here. A little extra mess because of non-recursive lock.
1078	*/
1079	void *pvObj = pHandle->pvObj;
1080	pHandle->pvObj = NULL;
1081	gvmmR0CreateDestroyUnlock(pGVMM);
1082
1083	SUPR0ObjRelease(pvObj, pSession);
1084
1085	SUPR0Printf("GVMMR0CreateVM: failed, rc=%Rrc\n", rc);
1086	return rc;
1087	}
1088
1089	rc = VERR_NO_MEMORY;
1090	}
1091	else
1092	rc = VERR_GVMM_IPE_1;
1093	}
1094	else
1095	rc = VERR_GVM_TOO_MANY_VMS;
1096
1097	gvmmR0CreateDestroyUnlock(pGVMM);
1098	return rc;
1099	}
1100
1101
1102	/**
1103	* Initializes the per VM data belonging to GVMM.
1104	*
1105	* @param pGVM Pointer to the global VM structure.
1106	* @param hSelf The handle.
1107	* @param cCpus The CPU count.
1108	* @param pSession The session this VM is associated with.
1109	*/
1110	static void gvmmR0InitPerVMData(PGVM pGVM, int16_t hSelf, VMCPUID cCpus, PSUPDRVSESSION pSession)
1111	{
1112	AssertCompile(RT_SIZEOFMEMB(GVM,gvmm.s) <= RT_SIZEOFMEMB(GVM,gvmm.padding));
1113	AssertCompile(RT_SIZEOFMEMB(GVMCPU,gvmm.s) <= RT_SIZEOFMEMB(GVMCPU,gvmm.padding));
1114	AssertCompileMemberAlignment(VM, cpum, 64);
1115	AssertCompileMemberAlignment(VM, tm, 64);
1116
1117	/* GVM: */
1118	pGVM->u32Magic = GVM_MAGIC;
1119	pGVM->hSelf = hSelf;
1120	pGVM->cCpus = cCpus;
1121	pGVM->pSession = pSession;
1122	pGVM->pSelf = pGVM;
1123
1124	/* VM: */
1125	pGVM->enmVMState = VMSTATE_CREATING;
1126	pGVM->hSelfUnsafe = hSelf;
1127	pGVM->pSessionUnsafe = pSession;
1128	pGVM->pVMR0ForCall = pGVM;
1129	pGVM->cCpusUnsafe = cCpus;
1130	pGVM->uCpuExecutionCap = 100; /* default is no cap. */
1131	pGVM->uStructVersion = 1;
1132	pGVM->cbSelf = sizeof(VM);
1133	pGVM->cbVCpu = sizeof(VMCPU);
1134
1135	/* GVMM: */
1136	pGVM->gvmm.s.VMMemObj = NIL_RTR0MEMOBJ;
1137	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
1138	pGVM->gvmm.s.VMPagesMemObj = NIL_RTR0MEMOBJ;
1139	pGVM->gvmm.s.VMPagesMapObj = NIL_RTR0MEMOBJ;
1140	pGVM->gvmm.s.fDoneVMMR0Init = false;
1141	pGVM->gvmm.s.fDoneVMMR0Term = false;
1142
1143	for (size_t i = 0; i < RT_ELEMENTS(pGVM->gvmm.s.aWorkerThreads); i++)
1144	{
1145	pGVM->gvmm.s.aWorkerThreads[i].hNativeThread = NIL_RTNATIVETHREAD;
1146	pGVM->gvmm.s.aWorkerThreads[i].hNativeThreadR3 = NIL_RTNATIVETHREAD;
1147	}
1148	pGVM->gvmm.s.aWorkerThreads[0].hNativeThread = GVMM_RTNATIVETHREAD_DESTROYED; /* invalid entry */
1149
1150	for (size_t i = 0; i < RT_ELEMENTS(pGVM->gvmm.s.aEmtHash); i++)
1151	{
1152	pGVM->gvmm.s.aEmtHash[i].hNativeEmt = NIL_RTNATIVETHREAD;
1153	pGVM->gvmm.s.aEmtHash[i].idVCpu = NIL_VMCPUID;
1154	}
1155
1156	/*
1157	* Per virtual CPU.
1158	*/
1159	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
1160	{
1161	pGVM->aCpus[i].idCpu = i;
1162	pGVM->aCpus[i].idCpuUnsafe = i;
1163	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
1164	pGVM->aCpus[i].gvmm.s.VMCpuMapObj = NIL_RTR0MEMOBJ;
1165	pGVM->aCpus[i].gvmm.s.idxEmtHash = UINT16_MAX;
1166	pGVM->aCpus[i].gvmm.s.hHrWakeUpTimer = NULL;
1167	pGVM->aCpus[i].hEMT = NIL_RTNATIVETHREAD;
1168	pGVM->aCpus[i].pGVM = pGVM;
1169	pGVM->aCpus[i].idHostCpu = NIL_RTCPUID;
1170	pGVM->aCpus[i].iHostCpuSet = UINT32_MAX;
1171	pGVM->aCpus[i].hNativeThread = NIL_RTNATIVETHREAD;
1172	pGVM->aCpus[i].hNativeThreadR0 = NIL_RTNATIVETHREAD;
1173	pGVM->aCpus[i].enmState = VMCPUSTATE_STOPPED;
1174	pGVM->aCpus[i].pVCpuR0ForVtg = &pGVM->aCpus[i];
1175	}
1176	}
1177
1178
1179	/**
1180	* Does the VM initialization.
1181	*
1182	* @returns VBox status code.
1183	* @param pGVM The global (ring-0) VM structure.
1184	*/
1185	GVMMR0DECL(int) GVMMR0InitVM(PGVM pGVM)
1186	{
1187	LogFlow(("GVMMR0InitVM: pGVM=%p\n", pGVM));
1188
1189	int rc = VERR_INTERNAL_ERROR_3;
1190	if ( !pGVM->gvmm.s.fDoneVMMR0Init
1191	&& pGVM->aCpus[0].gvmm.s.HaltEventMulti == NIL_RTSEMEVENTMULTI)
1192	{
1193	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
1194	{
1195	rc = RTSemEventMultiCreate(&pGVM->aCpus[i].gvmm.s.HaltEventMulti);
1196	if (RT_FAILURE(rc))
1197	{
1198	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
1199	break;
1200	}
1201	}
1202	}
1203	else
1204	rc = VERR_WRONG_ORDER;
1205
1206	LogFlow(("GVMMR0InitVM: returns %Rrc\n", rc));
1207	return rc;
1208	}
1209
1210
1211	/**
1212	* Indicates that we're done with the ring-0 initialization
1213	* of the VM.
1214	*
1215	* @param pGVM The global (ring-0) VM structure.
1216	* @thread EMT(0)
1217	*/
1218	GVMMR0DECL(void) GVMMR0DoneInitVM(PGVM pGVM)
1219	{
1220	/* Set the indicator. */
1221	pGVM->gvmm.s.fDoneVMMR0Init = true;
1222	}
1223
1224
1225	/**
1226	* Indicates that we're doing the ring-0 termination of the VM.
1227	*
1228	* @returns true if termination hasn't been done already, false if it has.
1229	* @param pGVM Pointer to the global VM structure. Optional.
1230	* @thread EMT(0) or session cleanup thread.
1231	*/
1232	GVMMR0DECL(bool) GVMMR0DoingTermVM(PGVM pGVM)
1233	{
1234	/* Validate the VM structure, state and handle. */
1235	AssertPtrReturn(pGVM, false);
1236
1237	/* Set the indicator. */
1238	if (pGVM->gvmm.s.fDoneVMMR0Term)
1239	return false;
1240	pGVM->gvmm.s.fDoneVMMR0Term = true;
1241	return true;
1242	}
1243
1244
1245	/**
1246	* Destroys the VM, freeing all associated resources (the ring-0 ones anyway).
1247	*
1248	* This is call from the vmR3DestroyFinalBit and from a error path in VMR3Create,
1249	* and the caller is not the EMT thread, unfortunately. For security reasons, it
1250	* would've been nice if the caller was actually the EMT thread or that we somehow
1251	* could've associated the calling thread with the VM up front.
1252	*
1253	* @returns VBox status code.
1254	* @param pGVM The global (ring-0) VM structure.
1255	*
1256	* @thread EMT(0) if it's associated with the VM, otherwise any thread.
1257	*/
1258	GVMMR0DECL(int) GVMMR0DestroyVM(PGVM pGVM)
1259	{
1260	LogFlow(("GVMMR0DestroyVM: pGVM=%p\n", pGVM));
1261	PGVMM pGVMM;
1262	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1263
1264	/*
1265	* Validate the VM structure, state and caller.
1266	*/
1267	AssertPtrReturn(pGVM, VERR_INVALID_POINTER);
1268	AssertReturn(!((uintptr_t)pGVM & HOST_PAGE_OFFSET_MASK), VERR_INVALID_POINTER);
1269	AssertMsgReturn(pGVM->enmVMState >= VMSTATE_CREATING && pGVM->enmVMState <= VMSTATE_TERMINATED, ("%d\n", pGVM->enmVMState),
1270	VERR_WRONG_ORDER);
1271
1272	uint32_t hGVM = pGVM->hSelf;
1273	ASMCompilerBarrier();
1274	AssertReturn(hGVM != NIL_GVM_HANDLE, VERR_INVALID_VM_HANDLE);
1275	AssertReturn(hGVM < RT_ELEMENTS(pGVMM->aHandles), VERR_INVALID_VM_HANDLE);
1276
1277	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1278	AssertReturn(pHandle->pGVM == pGVM, VERR_NOT_OWNER);
1279
1280	RTPROCESS ProcId = RTProcSelf();
1281	RTNATIVETHREAD hSelf = RTThreadNativeSelf();
1282	AssertReturn( ( pHandle->hEMT0 == hSelf
1283	&& pHandle->ProcId == ProcId)
1284	\|\| pHandle->hEMT0 == NIL_RTNATIVETHREAD, VERR_NOT_OWNER);
1285
1286	/*
1287	* Lookup the handle and destroy the object.
1288	* Since the lock isn't recursive and we'll have to leave it before dereferencing the
1289	* object, we take some precautions against racing callers just in case...
1290	*/
1291	int rc = gvmmR0CreateDestroyLock(pGVMM);
1292	AssertRC(rc);
1293
1294	/* Be careful here because we might theoretically be racing someone else cleaning up. */
1295	if ( pHandle->pGVM == pGVM
1296	&& ( ( pHandle->hEMT0 == hSelf
1297	&& pHandle->ProcId == ProcId)
1298	\|\| pHandle->hEMT0 == NIL_RTNATIVETHREAD)
1299	&& RT_VALID_PTR(pHandle->pvObj)
1300	&& RT_VALID_PTR(pHandle->pSession)
1301	&& RT_VALID_PTR(pHandle->pGVM)
1302	&& pHandle->pGVM->u32Magic == GVM_MAGIC)
1303	{
1304	/* Check that other EMTs have deregistered. */
1305	uint32_t cNotDeregistered = 0;
1306	for (VMCPUID idCpu = 1; idCpu < pGVM->cCpus; idCpu++)
1307	cNotDeregistered += pGVM->aCpus[idCpu].hEMT != GVMM_RTNATIVETHREAD_DESTROYED;
1308	if (cNotDeregistered == 0)
1309	{
1310	/* Grab the object pointer. */
1311	void *pvObj = pHandle->pvObj;
1312	pHandle->pvObj = NULL;
1313	gvmmR0CreateDestroyUnlock(pGVMM);
1314
1315	SUPR0ObjRelease(pvObj, pHandle->pSession);
1316	}
1317	else
1318	{
1319	gvmmR0CreateDestroyUnlock(pGVMM);
1320	rc = VERR_GVMM_NOT_ALL_EMTS_DEREGISTERED;
1321	}
1322	}
1323	else
1324	{
1325	SUPR0Printf("GVMMR0DestroyVM: pHandle=%RKv:{.pGVM=%p, .hEMT0=%p, .ProcId=%u, .pvObj=%p} pGVM=%p hSelf=%p\n",
1326	pHandle, pHandle->pGVM, pHandle->hEMT0, pHandle->ProcId, pHandle->pvObj, pGVM, hSelf);
1327	gvmmR0CreateDestroyUnlock(pGVMM);
1328	rc = VERR_GVMM_IPE_2;
1329	}
1330
1331	return rc;
1332	}
1333
1334
1335	/**
1336	* Performs VM cleanup task as part of object destruction.
1337	*
1338	* @param pGVM The GVM pointer.
1339	*/
1340	static void gvmmR0CleanupVM(PGVM pGVM)
1341	{
1342	if ( pGVM->gvmm.s.fDoneVMMR0Init
1343	&& !pGVM->gvmm.s.fDoneVMMR0Term)
1344	{
1345	if ( pGVM->gvmm.s.VMMemObj != NIL_RTR0MEMOBJ
1346	&& RTR0MemObjAddress(pGVM->gvmm.s.VMMemObj) == pGVM)
1347	{
1348	LogFlow(("gvmmR0CleanupVM: Calling VMMR0TermVM\n"));
1349	VMMR0TermVM(pGVM, NIL_VMCPUID);
1350	}
1351	else
1352	AssertMsgFailed(("gvmmR0CleanupVM: VMMemObj=%p pGVM=%p\n", pGVM->gvmm.s.VMMemObj, pGVM));
1353	}
1354
1355	GMMR0CleanupVM(pGVM);
1356	#ifdef VBOX_WITH_NEM_R0
1357	NEMR0CleanupVM(pGVM);
1358	#endif
1359	PDMR0CleanupVM(pGVM);
1360	IOMR0CleanupVM(pGVM);
1361	DBGFR0CleanupVM(pGVM);
1362	PGMR0CleanupVM(pGVM);
1363	TMR0CleanupVM(pGVM);
1364	VMMR0CleanupVM(pGVM);
1365	}
1366
1367
1368	/**
1369	* @callback_method_impl{FNSUPDRVDESTRUCTOR,VM handle destructor}
1370	*
1371	* pvUser1 is the GVM instance pointer.
1372	* pvUser2 is the handle pointer.
1373	*/
1374	static DECLCALLBACK(void) gvmmR0HandleObjDestructor(void pvObj, void pvUser1, void *pvUser2)
1375	{
1376	LogFlow(("gvmmR0HandleObjDestructor: %p %p %p\n", pvObj, pvUser1, pvUser2));
1377
1378	NOREF(pvObj);
1379
1380	/*
1381	* Some quick, paranoid, input validation.
1382	*/
1383	PGVMHANDLE pHandle = (PGVMHANDLE)pvUser2;
1384	AssertPtr(pHandle);
1385	PGVMM pGVMM = (PGVMM)pvUser1;
1386	Assert(pGVMM == g_pGVMM);
1387	const uint16_t iHandle = pHandle - &pGVMM->aHandles[0];
1388	if ( !iHandle
1389	\|\| iHandle >= RT_ELEMENTS(pGVMM->aHandles)
1390	\|\| iHandle != pHandle->iSelf)
1391	{
1392	SUPR0Printf("GVM: handle %d is out of range or corrupt (iSelf=%d)!\n", iHandle, pHandle->iSelf);
1393	return;
1394	}
1395
1396	int rc = gvmmR0CreateDestroyLock(pGVMM);
1397	AssertRC(rc);
1398	rc = GVMMR0_USED_EXCLUSIVE_LOCK(pGVMM);
1399	AssertRC(rc);
1400
1401	/*
1402	* This is a tad slow but a doubly linked list is too much hassle.
1403	*/
1404	if (RT_UNLIKELY(pHandle->iNext >= RT_ELEMENTS(pGVMM->aHandles)))
1405	{
1406	SUPR0Printf("GVM: used list index %d is out of range!\n", pHandle->iNext);
1407	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1408	gvmmR0CreateDestroyUnlock(pGVMM);
1409	return;
1410	}
1411
1412	if (pGVMM->iUsedHead == iHandle)
1413	pGVMM->iUsedHead = pHandle->iNext;
1414	else
1415	{
1416	uint16_t iPrev = pGVMM->iUsedHead;
1417	int c = RT_ELEMENTS(pGVMM->aHandles) + 2;
1418	while (iPrev)
1419	{
1420	if (RT_UNLIKELY(iPrev >= RT_ELEMENTS(pGVMM->aHandles)))
1421	{
1422	SUPR0Printf("GVM: used list index %d is out of range!\n", iPrev);
1423	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1424	gvmmR0CreateDestroyUnlock(pGVMM);
1425	return;
1426	}
1427	if (RT_UNLIKELY(c-- <= 0))
1428	{
1429	iPrev = 0;
1430	break;
1431	}
1432
1433	if (pGVMM->aHandles[iPrev].iNext == iHandle)
1434	break;
1435	iPrev = pGVMM->aHandles[iPrev].iNext;
1436	}
1437	if (!iPrev)
1438	{
1439	SUPR0Printf("GVM: can't find the handle previous previous of %d!\n", pHandle->iSelf);
1440	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1441	gvmmR0CreateDestroyUnlock(pGVMM);
1442	return;
1443	}
1444
1445	Assert(pGVMM->aHandles[iPrev].iNext == iHandle);
1446	pGVMM->aHandles[iPrev].iNext = pHandle->iNext;
1447	}
1448	pHandle->iNext = 0;
1449	pGVMM->cVMs--;
1450
1451	/*
1452	* Do the global cleanup round.
1453	*/
1454	PGVM pGVM = pHandle->pGVM;
1455	if ( RT_VALID_PTR(pGVM)
1456	&& pGVM->u32Magic == GVM_MAGIC)
1457	{
1458	pGVMM->cEMTs -= pGVM->cCpus;
1459
1460	if (pGVM->pSession)
1461	SUPR0SetSessionVM(pGVM->pSession, NULL, NULL);
1462
1463	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1464
1465	gvmmR0CleanupVM(pGVM);
1466
1467	/*
1468	* Do the GVMM cleanup - must be done last.
1469	*/
1470	/* The VM and VM pages mappings/allocations. */
1471	if (pGVM->gvmm.s.VMPagesMapObj != NIL_RTR0MEMOBJ)
1472	{
1473	rc = RTR0MemObjFree(pGVM->gvmm.s.VMPagesMapObj, false /* fFreeMappings */); AssertRC(rc);
1474	pGVM->gvmm.s.VMPagesMapObj = NIL_RTR0MEMOBJ;
1475	}
1476
1477	if (pGVM->gvmm.s.VMMapObj != NIL_RTR0MEMOBJ)
1478	{
1479	rc = RTR0MemObjFree(pGVM->gvmm.s.VMMapObj, false /* fFreeMappings */); AssertRC(rc);
1480	pGVM->gvmm.s.VMMapObj = NIL_RTR0MEMOBJ;
1481	}
1482
1483	if (pGVM->gvmm.s.VMPagesMemObj != NIL_RTR0MEMOBJ)
1484	{
1485	rc = RTR0MemObjFree(pGVM->gvmm.s.VMPagesMemObj, false /* fFreeMappings */); AssertRC(rc);
1486	pGVM->gvmm.s.VMPagesMemObj = NIL_RTR0MEMOBJ;
1487	}
1488
1489	for (VMCPUID i = 0; i < pGVM->cCpus; i++)
1490	{
1491	if (pGVM->aCpus[i].gvmm.s.HaltEventMulti != NIL_RTSEMEVENTMULTI)
1492	{
1493	rc = RTSemEventMultiDestroy(pGVM->aCpus[i].gvmm.s.HaltEventMulti); AssertRC(rc);
1494	pGVM->aCpus[i].gvmm.s.HaltEventMulti = NIL_RTSEMEVENTMULTI;
1495	}
1496	if (pGVM->aCpus[i].gvmm.s.VMCpuMapObj != NIL_RTR0MEMOBJ)
1497	{
1498	rc = RTR0MemObjFree(pGVM->aCpus[i].gvmm.s.VMCpuMapObj, false /* fFreeMappings */); AssertRC(rc);
1499	pGVM->aCpus[i].gvmm.s.VMCpuMapObj = NIL_RTR0MEMOBJ;
1500	}
1501	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
1502	if (pGVM->aCpus[i].gvmm.s.hHrWakeUpTimer != NULL)
1503	{
1504	RTTimerDestroy(pGVM->aCpus[i].gvmm.s.hHrWakeUpTimer);
1505	pGVM->aCpus[i].gvmm.s.hHrWakeUpTimer = NULL;
1506	}
1507	#endif
1508	}
1509
1510	/* the GVM structure itself. */
1511	pGVM->u32Magic \|= UINT32_C(0x80000000);
1512	Assert(pGVM->gvmm.s.VMMemObj != NIL_RTR0MEMOBJ);
1513	rc = RTR0MemObjFree(pGVM->gvmm.s.VMMemObj, true /fFreeMappings/); AssertRC(rc);
1514	pGVM = NULL;
1515
1516	/* Re-acquire the UsedLock before freeing the handle since we're updating handle fields. */
1517	rc = GVMMR0_USED_EXCLUSIVE_LOCK(pGVMM);
1518	AssertRC(rc);
1519	}
1520	/* else: GVMMR0CreateVM cleanup. */
1521
1522	/*
1523	* Free the handle.
1524	*/
1525	pHandle->iNext = pGVMM->iFreeHead;
1526	pGVMM->iFreeHead = iHandle;
1527	ASMAtomicWriteNullPtr(&pHandle->pGVM);
1528	ASMAtomicWriteNullPtr(&pHandle->pvObj);
1529	ASMAtomicWriteNullPtr(&pHandle->pSession);
1530	ASMAtomicWriteHandle(&pHandle->hEMT0, NIL_RTNATIVETHREAD);
1531	ASMAtomicWriteU32(&pHandle->ProcId, NIL_RTPROCESS);
1532
1533	GVMMR0_USED_EXCLUSIVE_UNLOCK(pGVMM);
1534	gvmmR0CreateDestroyUnlock(pGVMM);
1535	LogFlow(("gvmmR0HandleObjDestructor: returns\n"));
1536	}
1537
1538
1539	/**
1540	* Registers the calling thread as the EMT of a Virtual CPU.
1541	*
1542	* Note that VCPU 0 is automatically registered during VM creation.
1543	*
1544	* @returns VBox status code
1545	* @param pGVM The global (ring-0) VM structure.
1546	* @param idCpu VCPU id to register the current thread as.
1547	*/
1548	GVMMR0DECL(int) GVMMR0RegisterVCpu(PGVM pGVM, VMCPUID idCpu)
1549	{
1550	AssertReturn(idCpu != 0, VERR_INVALID_FUNCTION);
1551
1552	/*
1553	* Validate the VM structure, state and handle.
1554	*/
1555	PGVMM pGVMM;
1556	int rc = gvmmR0ByGVM(pGVM, &pGVMM, false /* fTakeUsedLock */);
1557	if (RT_SUCCESS(rc))
1558	{
1559	if (idCpu < pGVM->cCpus)
1560	{
1561	PGVMCPU const pGVCpu = &pGVM->aCpus[idCpu];
1562	RTNATIVETHREAD const hNativeSelf = RTThreadNativeSelf();
1563
1564	gvmmR0CreateDestroyLock(pGVMM); /** @todo per-VM lock? */
1565
1566	/* Check that the EMT isn't already assigned to a thread. */
1567	if (pGVCpu->hEMT == NIL_RTNATIVETHREAD)
1568	{
1569	Assert(pGVCpu->hNativeThreadR0 == NIL_RTNATIVETHREAD);
1570
1571	/* A thread may only be one EMT (this makes sure hNativeSelf isn't NIL). */
1572	for (VMCPUID iCpu = 0; iCpu < pGVM->cCpus; iCpu++)
1573	AssertBreakStmt(pGVM->aCpus[iCpu].hEMT != hNativeSelf, rc = VERR_INVALID_PARAMETER);
1574	if (RT_SUCCESS(rc))
1575	{
1576	/*
1577	* Do the assignment, then try setup the hook. Undo if that fails.
1578	*/
1579	unsigned cCollisions = 0;
1580	uint32_t idxHash = GVMM_EMT_HASH_1(hNativeSelf);
1581	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt != NIL_RTNATIVETHREAD)
1582	{
1583	uint32_t const idxHash2 = GVMM_EMT_HASH_2(hNativeSelf);
1584	do
1585	{
1586	cCollisions++;
1587	Assert(cCollisions < GVMM_EMT_HASH_SIZE);
1588	idxHash = (idxHash + idxHash2) % GVMM_EMT_HASH_SIZE;
1589	} while (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt != NIL_RTNATIVETHREAD);
1590	}
1591	pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt = hNativeSelf;
1592	pGVM->gvmm.s.aEmtHash[idxHash].idVCpu = idCpu;
1593
1594	pGVCpu->hNativeThreadR0 = hNativeSelf;
1595	pGVCpu->hEMT = hNativeSelf;
1596	pGVCpu->cEmtHashCollisions = (uint8_t)cCollisions;
1597	pGVCpu->gvmm.s.idxEmtHash = (uint16_t)idxHash;
1598
1599	rc = VMMR0ThreadCtxHookCreateForEmt(pGVCpu);
1600	if (RT_SUCCESS(rc))
1601	{
1602	CPUMR0RegisterVCpuThread(pGVCpu);
1603
1604	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
1605	/*
1606	* Create the high resolution wake-up timer, ignore failures.
1607	*/
1608	if (RTTimerCanDoHighResolution())
1609	{
1610	int rc2 = RTTimerCreateEx(&pGVCpu->gvmm.s.hHrWakeUpTimer, 0 /one-shot, no interval/,
1611	RTTIMER_FLAGS_HIGH_RES, gvmmR0EmtWakeUpTimerCallback, pGVCpu);
1612	if (RT_FAILURE(rc2))
1613	pGVCpu->gvmm.s.hHrWakeUpTimer = NULL;
1614	}
1615	#endif
1616	}
1617	else
1618	{
1619	pGVCpu->hNativeThreadR0 = NIL_RTNATIVETHREAD;
1620	pGVCpu->hEMT = NIL_RTNATIVETHREAD;
1621	pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt = NIL_RTNATIVETHREAD;
1622	pGVM->gvmm.s.aEmtHash[idxHash].idVCpu = NIL_VMCPUID;
1623	pGVCpu->gvmm.s.idxEmtHash = UINT16_MAX;
1624	}
1625	}
1626	}
1627	else
1628	rc = VERR_ACCESS_DENIED;
1629
1630	gvmmR0CreateDestroyUnlock(pGVMM);
1631	}
1632	else
1633	rc = VERR_INVALID_CPU_ID;
1634	}
1635	return rc;
1636	}
1637
1638
1639	/**
1640	* Deregisters the calling thread as the EMT of a Virtual CPU.
1641	*
1642	* Note that VCPU 0 shall call GVMMR0DestroyVM intead of this API.
1643	*
1644	* @returns VBox status code
1645	* @param pGVM The global (ring-0) VM structure.
1646	* @param idCpu VCPU id to register the current thread as.
1647	*/
1648	GVMMR0DECL(int) GVMMR0DeregisterVCpu(PGVM pGVM, VMCPUID idCpu)
1649	{
1650	AssertReturn(idCpu != 0, VERR_INVALID_FUNCTION);
1651
1652	/*
1653	* Validate the VM structure, state and handle.
1654	*/
1655	PGVMM pGVMM;
1656	int rc = gvmmR0ByGVMandEMT(pGVM, idCpu, &pGVMM);
1657	if (RT_SUCCESS(rc))
1658	{
1659	/*
1660	* Take the destruction lock and recheck the handle state to
1661	* prevent racing GVMMR0DestroyVM.
1662	*/
1663	gvmmR0CreateDestroyLock(pGVMM);
1664
1665	uint32_t hSelf = pGVM->hSelf;
1666	ASMCompilerBarrier();
1667	if ( hSelf < RT_ELEMENTS(pGVMM->aHandles)
1668	&& pGVMM->aHandles[hSelf].pvObj != NULL
1669	&& pGVMM->aHandles[hSelf].pGVM == pGVM)
1670	{
1671	/*
1672	* Do per-EMT cleanups.
1673	*/
1674	VMMR0ThreadCtxHookDestroyForEmt(&pGVM->aCpus[idCpu]);
1675
1676	/*
1677	* Invalidate hEMT. We don't use NIL here as that would allow
1678	* GVMMR0RegisterVCpu to be called again, and we don't want that.
1679	*/
1680	pGVM->aCpus[idCpu].hEMT = GVMM_RTNATIVETHREAD_DESTROYED;
1681	pGVM->aCpus[idCpu].hNativeThreadR0 = NIL_RTNATIVETHREAD;
1682
1683	uint32_t const idxHash = pGVM->aCpus[idCpu].gvmm.s.idxEmtHash;
1684	if (idxHash < RT_ELEMENTS(pGVM->gvmm.s.aEmtHash))
1685	pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt = GVMM_RTNATIVETHREAD_DESTROYED;
1686	}
1687
1688	gvmmR0CreateDestroyUnlock(pGVMM);
1689	}
1690	return rc;
1691	}
1692
1693
1694	/**
1695	* Registers the caller as a given worker thread.
1696	*
1697	* This enables the thread to operate critical sections in ring-0.
1698	*
1699	* @returns VBox status code.
1700	* @param pGVM The global (ring-0) VM structure.
1701	* @param enmWorker The worker thread this is supposed to be.
1702	* @param hNativeSelfR3 The ring-3 native self of the caller.
1703	*/
1704	GVMMR0DECL(int) GVMMR0RegisterWorkerThread(PGVM pGVM, GVMMWORKERTHREAD enmWorker, RTNATIVETHREAD hNativeSelfR3)
1705	{
1706	/*
1707	* Validate input.
1708	*/
1709	AssertReturn(enmWorker > GVMMWORKERTHREAD_INVALID && enmWorker < GVMMWORKERTHREAD_END, VERR_INVALID_PARAMETER);
1710	AssertReturn(hNativeSelfR3 != NIL_RTNATIVETHREAD, VERR_INVALID_HANDLE);
1711	RTNATIVETHREAD const hNativeSelf = RTThreadNativeSelf();
1712	AssertReturn(hNativeSelf != NIL_RTNATIVETHREAD, VERR_INTERNAL_ERROR_3);
1713	PGVMM pGVMM;
1714	int rc = gvmmR0ByGVM(pGVM, &pGVMM, false /fTakeUsedLock/);
1715	AssertRCReturn(rc, rc);
1716	AssertReturn(pGVM->enmVMState < VMSTATE_DESTROYING, VERR_VM_INVALID_VM_STATE);
1717
1718	/*
1719	* Grab the big lock and check the VM state again.
1720	*/
1721	uint32_t const hSelf = pGVM->hSelf;
1722	gvmmR0CreateDestroyLock(pGVMM); /** @todo per-VM lock? */
1723	if ( hSelf < RT_ELEMENTS(pGVMM->aHandles)
1724	&& pGVMM->aHandles[hSelf].pvObj != NULL
1725	&& pGVMM->aHandles[hSelf].pGVM == pGVM
1726	&& pGVMM->aHandles[hSelf].ProcId == RTProcSelf())
1727	{
1728	if (pGVM->enmVMState < VMSTATE_DESTROYING)
1729	{
1730	/*
1731	* Check that the thread isn't an EMT or serving in some other worker capacity.
1732	*/
1733	for (VMCPUID iCpu = 0; iCpu < pGVM->cCpus; iCpu++)
1734	AssertBreakStmt(pGVM->aCpus[iCpu].hEMT != hNativeSelf, rc = VERR_INVALID_PARAMETER);
1735	for (size_t idx = 0; idx < RT_ELEMENTS(pGVM->gvmm.s.aWorkerThreads); idx++)
1736	AssertBreakStmt(idx == (size_t)enmWorker \|\| pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread != hNativeSelf,
1737	rc = VERR_INVALID_PARAMETER);
1738	if (RT_SUCCESS(rc))
1739	{
1740	/*
1741	* Do the registration.
1742	*/
1743	if ( pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread == NIL_RTNATIVETHREAD
1744	&& pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThreadR3 == NIL_RTNATIVETHREAD)
1745	{
1746	pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread = hNativeSelf;
1747	pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThreadR3 = hNativeSelfR3;
1748	rc = VINF_SUCCESS;
1749	}
1750	else if ( pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread == hNativeSelf
1751	&& pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThreadR3 == hNativeSelfR3)
1752	rc = VERR_ALREADY_EXISTS;
1753	else
1754	rc = VERR_RESOURCE_BUSY;
1755	}
1756	}
1757	else
1758	rc = VERR_VM_INVALID_VM_STATE;
1759	}
1760	else
1761	rc = VERR_INVALID_VM_HANDLE;
1762	gvmmR0CreateDestroyUnlock(pGVMM);
1763	return rc;
1764	}
1765
1766
1767	/**
1768	* Deregisters a workinger thread (caller).
1769	*
1770	* The worker thread cannot be re-created and re-registered, instead the given
1771	* @a enmWorker slot becomes invalid.
1772	*
1773	* @returns VBox status code.
1774	* @param pGVM The global (ring-0) VM structure.
1775	* @param enmWorker The worker thread this is supposed to be.
1776	*/
1777	GVMMR0DECL(int) GVMMR0DeregisterWorkerThread(PGVM pGVM, GVMMWORKERTHREAD enmWorker)
1778	{
1779	/*
1780	* Validate input.
1781	*/
1782	AssertReturn(enmWorker > GVMMWORKERTHREAD_INVALID && enmWorker < GVMMWORKERTHREAD_END, VERR_INVALID_PARAMETER);
1783	RTNATIVETHREAD const hNativeThread = RTThreadNativeSelf();
1784	AssertReturn(hNativeThread != NIL_RTNATIVETHREAD, VERR_INTERNAL_ERROR_3);
1785	PGVMM pGVMM;
1786	int rc = gvmmR0ByGVM(pGVM, &pGVMM, false /fTakeUsedLock/);
1787	AssertRCReturn(rc, rc);
1788
1789	/*
1790	* Grab the big lock and check the VM state again.
1791	*/
1792	uint32_t const hSelf = pGVM->hSelf;
1793	gvmmR0CreateDestroyLock(pGVMM); /** @todo per-VM lock? */
1794	if ( hSelf < RT_ELEMENTS(pGVMM->aHandles)
1795	&& pGVMM->aHandles[hSelf].pvObj != NULL
1796	&& pGVMM->aHandles[hSelf].pGVM == pGVM
1797	&& pGVMM->aHandles[hSelf].ProcId == RTProcSelf())
1798	{
1799	/*
1800	* Do the deregistration.
1801	* This will prevent any other threads register as the worker later.
1802	*/
1803	if (pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread == hNativeThread)
1804	{
1805	pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread = GVMM_RTNATIVETHREAD_DESTROYED;
1806	pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThreadR3 = GVMM_RTNATIVETHREAD_DESTROYED;
1807	rc = VINF_SUCCESS;
1808	}
1809	else if ( pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThread == GVMM_RTNATIVETHREAD_DESTROYED
1810	&& pGVM->gvmm.s.aWorkerThreads[enmWorker].hNativeThreadR3 == GVMM_RTNATIVETHREAD_DESTROYED)
1811	rc = VINF_SUCCESS;
1812	else
1813	rc = VERR_NOT_OWNER;
1814	}
1815	else
1816	rc = VERR_INVALID_VM_HANDLE;
1817	gvmmR0CreateDestroyUnlock(pGVMM);
1818	return rc;
1819	}
1820
1821
1822	/**
1823	* Lookup a GVM structure by its handle.
1824	*
1825	* @returns The GVM pointer on success, NULL on failure.
1826	* @param hGVM The global VM handle. Asserts on bad handle.
1827	*/
1828	GVMMR0DECL(PGVM) GVMMR0ByHandle(uint32_t hGVM)
1829	{
1830	PGVMM pGVMM;
1831	GVMM_GET_VALID_INSTANCE(pGVMM, NULL);
1832
1833	/*
1834	* Validate.
1835	*/
1836	AssertReturn(hGVM != NIL_GVM_HANDLE, NULL);
1837	AssertReturn(hGVM < RT_ELEMENTS(pGVMM->aHandles), NULL);
1838
1839	/*
1840	* Look it up.
1841	*/
1842	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1843	AssertPtrReturn(pHandle->pvObj, NULL);
1844	PGVM pGVM = pHandle->pGVM;
1845	AssertPtrReturn(pGVM, NULL);
1846
1847	return pGVM;
1848	}
1849
1850
1851	/**
1852	* Check that the given GVM and VM structures match up.
1853	*
1854	* The calling thread must be in the same process as the VM. All current lookups
1855	* are by threads inside the same process, so this will not be an issue.
1856	*
1857	* @returns VBox status code.
1858	* @param pGVM The global (ring-0) VM structure.
1859	* @param ppGVMM Where to store the pointer to the GVMM instance data.
1860	* @param fTakeUsedLock Whether to take the used lock or not. We take it in
1861	* shared mode when requested.
1862	*
1863	* Be very careful if not taking the lock as it's
1864	* possible that the VM will disappear then!
1865	*
1866	* @remark This will not assert on an invalid pGVM but try return silently.
1867	*/
1868	static int gvmmR0ByGVM(PGVM pGVM, PGVMM *ppGVMM, bool fTakeUsedLock)
1869	{
1870	/*
1871	* Check the pointers.
1872	*/
1873	int rc;
1874	if (RT_LIKELY( RT_VALID_PTR(pGVM)
1875	&& ((uintptr_t)pGVM & HOST_PAGE_OFFSET_MASK) == 0 ))
1876	{
1877	/*
1878	* Get the pGVMM instance and check the VM handle.
1879	*/
1880	PGVMM pGVMM;
1881	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1882
1883	uint16_t hGVM = pGVM->hSelf;
1884	if (RT_LIKELY( hGVM != NIL_GVM_HANDLE
1885	&& hGVM < RT_ELEMENTS(pGVMM->aHandles)))
1886	{
1887	RTPROCESS const pidSelf = RTProcSelf();
1888	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1889	if (fTakeUsedLock)
1890	{
1891	rc = GVMMR0_USED_SHARED_LOCK(pGVMM);
1892	AssertRCReturn(rc, rc);
1893	}
1894
1895	if (RT_LIKELY( pHandle->pGVM == pGVM
1896	&& pHandle->ProcId == pidSelf
1897	&& RT_VALID_PTR(pHandle->pvObj)))
1898	{
1899	/*
1900	* Some more VM data consistency checks.
1901	*/
1902	if (RT_LIKELY( pGVM->cCpusUnsafe == pGVM->cCpus
1903	&& pGVM->hSelfUnsafe == hGVM
1904	&& pGVM->pSelf == pGVM))
1905	{
1906	if (RT_LIKELY( pGVM->enmVMState >= VMSTATE_CREATING
1907	&& pGVM->enmVMState <= VMSTATE_TERMINATED))
1908	{
1909	*ppGVMM = pGVMM;
1910	return VINF_SUCCESS;
1911	}
1912	rc = VERR_INCONSISTENT_VM_HANDLE;
1913	}
1914	else
1915	rc = VERR_INCONSISTENT_VM_HANDLE;
1916	}
1917	else
1918	rc = VERR_INVALID_VM_HANDLE;
1919
1920	if (fTakeUsedLock)
1921	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
1922	}
1923	else
1924	rc = VERR_INVALID_VM_HANDLE;
1925	}
1926	else
1927	rc = VERR_INVALID_POINTER;
1928	return rc;
1929	}
1930
1931
1932	/**
1933	* Validates a GVM/VM pair.
1934	*
1935	* @returns VBox status code.
1936	* @param pGVM The global (ring-0) VM structure.
1937	*/
1938	GVMMR0DECL(int) GVMMR0ValidateGVM(PGVM pGVM)
1939	{
1940	PGVMM pGVMM;
1941	return gvmmR0ByGVM(pGVM, &pGVMM, false /fTakeUsedLock/);
1942	}
1943
1944
1945	/**
1946	* Check that the given GVM and VM structures match up.
1947	*
1948	* The calling thread must be in the same process as the VM. All current lookups
1949	* are by threads inside the same process, so this will not be an issue.
1950	*
1951	* @returns VBox status code.
1952	* @param pGVM The global (ring-0) VM structure.
1953	* @param idCpu The (alleged) Virtual CPU ID of the calling EMT.
1954	* @param ppGVMM Where to store the pointer to the GVMM instance data.
1955	* @thread EMT
1956	*
1957	* @remarks This will assert in all failure paths.
1958	*/
1959	static int gvmmR0ByGVMandEMT(PGVM pGVM, VMCPUID idCpu, PGVMM *ppGVMM)
1960	{
1961	/*
1962	* Check the pointers.
1963	*/
1964	AssertPtrReturn(pGVM, VERR_INVALID_POINTER);
1965	AssertReturn(((uintptr_t)pGVM & HOST_PAGE_OFFSET_MASK) == 0, VERR_INVALID_POINTER);
1966
1967	/*
1968	* Get the pGVMM instance and check the VM handle.
1969	*/
1970	PGVMM pGVMM;
1971	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
1972
1973	uint16_t hGVM = pGVM->hSelf;
1974	ASMCompilerBarrier();
1975	AssertReturn( hGVM != NIL_GVM_HANDLE
1976	&& hGVM < RT_ELEMENTS(pGVMM->aHandles), VERR_INVALID_VM_HANDLE);
1977
1978	RTPROCESS const pidSelf = RTProcSelf();
1979	PGVMHANDLE pHandle = &pGVMM->aHandles[hGVM];
1980	AssertReturn( pHandle->pGVM == pGVM
1981	&& pHandle->ProcId == pidSelf
1982	&& RT_VALID_PTR(pHandle->pvObj),
1983	VERR_INVALID_HANDLE);
1984
1985	/*
1986	* Check the EMT claim.
1987	*/
1988	RTNATIVETHREAD const hAllegedEMT = RTThreadNativeSelf();
1989	AssertReturn(idCpu < pGVM->cCpus, VERR_INVALID_CPU_ID);
1990	AssertReturn(pGVM->aCpus[idCpu].hEMT == hAllegedEMT, VERR_NOT_OWNER);
1991
1992	/*
1993	* Some more VM data consistency checks.
1994	*/
1995	AssertReturn(pGVM->cCpusUnsafe == pGVM->cCpus, VERR_INCONSISTENT_VM_HANDLE);
1996	AssertReturn(pGVM->hSelfUnsafe == hGVM, VERR_INCONSISTENT_VM_HANDLE);
1997	AssertReturn( pGVM->enmVMState >= VMSTATE_CREATING
1998	&& pGVM->enmVMState <= VMSTATE_TERMINATED, VERR_INCONSISTENT_VM_HANDLE);
1999
2000	*ppGVMM = pGVMM;
2001	return VINF_SUCCESS;
2002	}
2003
2004
2005	/**
2006	* Validates a GVM/EMT pair.
2007	*
2008	* @returns VBox status code.
2009	* @param pGVM The global (ring-0) VM structure.
2010	* @param idCpu The Virtual CPU ID of the calling EMT.
2011	* @thread EMT(idCpu)
2012	*/
2013	GVMMR0DECL(int) GVMMR0ValidateGVMandEMT(PGVM pGVM, VMCPUID idCpu)
2014	{
2015	PGVMM pGVMM;
2016	return gvmmR0ByGVMandEMT(pGVM, idCpu, &pGVMM);
2017	}
2018
2019
2020	/**
2021	* Looks up the VM belonging to the specified EMT thread.
2022	*
2023	* This is used by the assertion machinery in VMMR0.cpp to avoid causing
2024	* unnecessary kernel panics when the EMT thread hits an assertion. The
2025	* call may or not be an EMT thread.
2026	*
2027	* @returns Pointer to the VM on success, NULL on failure.
2028	* @param hEMT The native thread handle of the EMT.
2029	* NIL_RTNATIVETHREAD means the current thread
2030	*/
2031	GVMMR0DECL(PVMCC) GVMMR0GetVMByEMT(RTNATIVETHREAD hEMT)
2032	{
2033	/*
2034	* No Assertions here as we're usually called in a AssertMsgN or
2035	* RTAssert* context.
2036	*/
2037	PGVMM pGVMM = g_pGVMM;
2038	if ( !RT_VALID_PTR(pGVMM)
2039	\|\| pGVMM->u32Magic != GVMM_MAGIC)
2040	return NULL;
2041
2042	if (hEMT == NIL_RTNATIVETHREAD)
2043	hEMT = RTThreadNativeSelf();
2044	RTPROCESS ProcId = RTProcSelf();
2045
2046	/*
2047	* Search the handles in a linear fashion as we don't dare to take the lock (assert).
2048	*/
2049	/** @todo introduce some pid hash table here, please. */
2050	for (unsigned i = 1; i < RT_ELEMENTS(pGVMM->aHandles); i++)
2051	{
2052	if ( pGVMM->aHandles[i].iSelf == i
2053	&& pGVMM->aHandles[i].ProcId == ProcId
2054	&& RT_VALID_PTR(pGVMM->aHandles[i].pvObj)
2055	&& RT_VALID_PTR(pGVMM->aHandles[i].pGVM))
2056	{
2057	if (pGVMM->aHandles[i].hEMT0 == hEMT)
2058	return pGVMM->aHandles[i].pGVM;
2059
2060	/* This is fearly safe with the current process per VM approach. */
2061	PGVM pGVM = pGVMM->aHandles[i].pGVM;
2062	VMCPUID const cCpus = pGVM->cCpus;
2063	ASMCompilerBarrier();
2064	if ( cCpus < 1
2065	\|\| cCpus > VMM_MAX_CPU_COUNT)
2066	continue;
2067	for (VMCPUID idCpu = 1; idCpu < cCpus; idCpu++)
2068	if (pGVM->aCpus[idCpu].hEMT == hEMT)
2069	return pGVMM->aHandles[i].pGVM;
2070	}
2071	}
2072	return NULL;
2073	}
2074
2075
2076	/**
2077	* Looks up the GVMCPU belonging to the specified EMT thread.
2078	*
2079	* This is used by the assertion machinery in VMMR0.cpp to avoid causing
2080	* unnecessary kernel panics when the EMT thread hits an assertion. The
2081	* call may or not be an EMT thread.
2082	*
2083	* @returns Pointer to the VM on success, NULL on failure.
2084	* @param hEMT The native thread handle of the EMT.
2085	* NIL_RTNATIVETHREAD means the current thread
2086	*/
2087	GVMMR0DECL(PGVMCPU) GVMMR0GetGVCpuByEMT(RTNATIVETHREAD hEMT)
2088	{
2089	/*
2090	* No Assertions here as we're usually called in a AssertMsgN,
2091	* RTAssert*, Log and LogRel contexts.
2092	*/
2093	PGVMM pGVMM = g_pGVMM;
2094	if ( !RT_VALID_PTR(pGVMM)
2095	\|\| pGVMM->u32Magic != GVMM_MAGIC)
2096	return NULL;
2097
2098	if (hEMT == NIL_RTNATIVETHREAD)
2099	hEMT = RTThreadNativeSelf();
2100	RTPROCESS ProcId = RTProcSelf();
2101
2102	/*
2103	* Search the handles in a linear fashion as we don't dare to take the lock (assert).
2104	*/
2105	/** @todo introduce some pid hash table here, please. */
2106	for (unsigned i = 1; i < RT_ELEMENTS(pGVMM->aHandles); i++)
2107	{
2108	if ( pGVMM->aHandles[i].iSelf == i
2109	&& pGVMM->aHandles[i].ProcId == ProcId
2110	&& RT_VALID_PTR(pGVMM->aHandles[i].pvObj)
2111	&& RT_VALID_PTR(pGVMM->aHandles[i].pGVM))
2112	{
2113	PGVM pGVM = pGVMM->aHandles[i].pGVM;
2114	if (pGVMM->aHandles[i].hEMT0 == hEMT)
2115	return &pGVM->aCpus[0];
2116
2117	/* This is fearly safe with the current process per VM approach. */
2118	VMCPUID const cCpus = pGVM->cCpus;
2119	ASMCompilerBarrier();
2120	ASMCompilerBarrier();
2121	if ( cCpus < 1
2122	\|\| cCpus > VMM_MAX_CPU_COUNT)
2123	continue;
2124	for (VMCPUID idCpu = 1; idCpu < cCpus; idCpu++)
2125	if (pGVM->aCpus[idCpu].hEMT == hEMT)
2126	return &pGVM->aCpus[idCpu];
2127	}
2128	}
2129	return NULL;
2130	}
2131
2132
2133	/**
2134	* Get the GVMCPU structure for the given EMT.
2135	*
2136	* @returns The VCpu structure for @a hEMT, NULL if not an EMT.
2137	* @param pGVM The global (ring-0) VM structure.
2138	* @param hEMT The native thread handle of the EMT.
2139	* NIL_RTNATIVETHREAD means the current thread
2140	*/
2141	GVMMR0DECL(PGVMCPU) GVMMR0GetGVCpuByGVMandEMT(PGVM pGVM, RTNATIVETHREAD hEMT)
2142	{
2143	/*
2144	* Validate & adjust input.
2145	*/
2146	AssertPtr(pGVM);
2147	Assert(pGVM->u32Magic == GVM_MAGIC);
2148	if (hEMT == NIL_RTNATIVETHREAD /* likely */)
2149	{
2150	hEMT = RTThreadNativeSelf();
2151	AssertReturn(hEMT != NIL_RTNATIVETHREAD, NULL);
2152	}
2153
2154	/*
2155	* Find the matching hash table entry.
2156	* See similar code in GVMMR0GetRing3ThreadForSelf.
2157	*/
2158	uint32_t idxHash = GVMM_EMT_HASH_1(hEMT);
2159	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == hEMT)
2160	{ /* likely */ }
2161	else
2162	{
2163	#ifdef VBOX_STRICT
2164	unsigned cCollisions = 0;
2165	#endif
2166	uint32_t const idxHash2 = GVMM_EMT_HASH_2(hEMT);
2167	for (;;)
2168	{
2169	Assert(cCollisions++ < GVMM_EMT_HASH_SIZE);
2170	idxHash = (idxHash + idxHash2) % GVMM_EMT_HASH_SIZE;
2171	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == hEMT)
2172	break;
2173	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == NIL_RTNATIVETHREAD)
2174	{
2175	#ifdef VBOX_STRICT
2176	uint32_t idxCpu = pGVM->cCpus;
2177	AssertStmt(idxCpu < VMM_MAX_CPU_COUNT, idxCpu = VMM_MAX_CPU_COUNT);
2178	while (idxCpu-- > 0)
2179	Assert(pGVM->aCpus[idxCpu].hNativeThreadR0 != hEMT);
2180	#endif
2181	return NULL;
2182	}
2183	}
2184	}
2185
2186	/*
2187	* Validate the VCpu number and translate it into a pointer.
2188	*/
2189	VMCPUID const idCpu = pGVM->gvmm.s.aEmtHash[idxHash].idVCpu;
2190	AssertReturn(idCpu < pGVM->cCpus, NULL);
2191	PGVMCPU pGVCpu = &pGVM->aCpus[idCpu];
2192	Assert(pGVCpu->hNativeThreadR0 == hEMT);
2193	Assert(pGVCpu->gvmm.s.idxEmtHash == idxHash);
2194	return pGVCpu;
2195	}
2196
2197
2198	/**
2199	* Get the native ring-3 thread handle for the caller.
2200	*
2201	* This works for EMTs and registered workers.
2202	*
2203	* @returns ring-3 native thread handle or NIL_RTNATIVETHREAD.
2204	* @param pGVM The global (ring-0) VM structure.
2205	*/
2206	GVMMR0DECL(RTNATIVETHREAD) GVMMR0GetRing3ThreadForSelf(PGVM pGVM)
2207	{
2208	/*
2209	* Validate input.
2210	*/
2211	AssertPtr(pGVM);
2212	AssertReturn(pGVM->u32Magic == GVM_MAGIC, NIL_RTNATIVETHREAD);
2213	RTNATIVETHREAD const hNativeSelf = RTThreadNativeSelf();
2214	AssertReturn(hNativeSelf != NIL_RTNATIVETHREAD, NIL_RTNATIVETHREAD);
2215
2216	/*
2217	* Find the matching hash table entry.
2218	* See similar code in GVMMR0GetGVCpuByGVMandEMT.
2219	*/
2220	uint32_t idxHash = GVMM_EMT_HASH_1(hNativeSelf);
2221	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == hNativeSelf)
2222	{ /* likely */ }
2223	else
2224	{
2225	#ifdef VBOX_STRICT
2226	unsigned cCollisions = 0;
2227	#endif
2228	uint32_t const idxHash2 = GVMM_EMT_HASH_2(hNativeSelf);
2229	for (;;)
2230	{
2231	Assert(cCollisions++ < GVMM_EMT_HASH_SIZE);
2232	idxHash = (idxHash + idxHash2) % GVMM_EMT_HASH_SIZE;
2233	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == hNativeSelf)
2234	break;
2235	if (pGVM->gvmm.s.aEmtHash[idxHash].hNativeEmt == NIL_RTNATIVETHREAD)
2236	{
2237	#ifdef VBOX_STRICT
2238	uint32_t idxCpu = pGVM->cCpus;
2239	AssertStmt(idxCpu < VMM_MAX_CPU_COUNT, idxCpu = VMM_MAX_CPU_COUNT);
2240	while (idxCpu-- > 0)
2241	Assert(pGVM->aCpus[idxCpu].hNativeThreadR0 != hNativeSelf);
2242	#endif
2243
2244	/*
2245	* Not an EMT, so see if it's a worker thread.
2246	*/
2247	size_t idx = RT_ELEMENTS(pGVM->gvmm.s.aWorkerThreads);
2248	while (--idx > GVMMWORKERTHREAD_INVALID)
2249	if (pGVM->gvmm.s.aWorkerThreads[idx].hNativeThread == hNativeSelf)
2250	return pGVM->gvmm.s.aWorkerThreads[idx].hNativeThreadR3;
2251
2252	return NIL_RTNATIVETHREAD;
2253	}
2254	}
2255	}
2256
2257	/*
2258	* Validate the VCpu number and translate it into a pointer.
2259	*/
2260	VMCPUID const idCpu = pGVM->gvmm.s.aEmtHash[idxHash].idVCpu;
2261	AssertReturn(idCpu < pGVM->cCpus, NIL_RTNATIVETHREAD);
2262	PGVMCPU pGVCpu = &pGVM->aCpus[idCpu];
2263	Assert(pGVCpu->hNativeThreadR0 == hNativeSelf);
2264	Assert(pGVCpu->gvmm.s.idxEmtHash == idxHash);
2265	return pGVCpu->hNativeThread;
2266	}
2267
2268
2269	/**
2270	* Converts a pointer with the GVM structure to a host physical address.
2271	*
2272	* @returns Host physical address.
2273	* @param pGVM The global (ring-0) VM structure.
2274	* @param pv The address to convert.
2275	* @thread EMT
2276	*/
2277	GVMMR0DECL(RTHCPHYS) GVMMR0ConvertGVMPtr2HCPhys(PGVM pGVM, void *pv)
2278	{
2279	AssertPtr(pGVM);
2280	Assert(pGVM->u32Magic == GVM_MAGIC);
2281	uintptr_t const off = (uintptr_t)pv - (uintptr_t)pGVM;
2282	Assert(off < RT_UOFFSETOF_DYN(GVM, aCpus[pGVM->cCpus]));
2283	return RTR0MemObjGetPagePhysAddr(pGVM->gvmm.s.VMMemObj, off >> HOST_PAGE_SHIFT) \| ((uintptr_t)pv & HOST_PAGE_OFFSET_MASK);
2284	}
2285
2286
2287	/**
2288	* This is will wake up expired and soon-to-be expired VMs.
2289	*
2290	* @returns Number of VMs that has been woken up.
2291	* @param pGVMM Pointer to the GVMM instance data.
2292	* @param u64Now The current time.
2293	*/
2294	static unsigned gvmmR0SchedDoWakeUps(PGVMM pGVMM, uint64_t u64Now)
2295	{
2296	/*
2297	* Skip this if we've got disabled because of high resolution wakeups or by
2298	* the user.
2299	*/
2300	if (!pGVMM->fDoEarlyWakeUps)
2301	return 0;
2302
2303	/** @todo Rewrite this algorithm. See performance defect XYZ. */
2304
2305	/*
2306	* A cheap optimization to stop wasting so much time here on big setups.
2307	*/
2308	const uint64_t uNsEarlyWakeUp2 = u64Now + pGVMM->nsEarlyWakeUp2;
2309	if ( pGVMM->cHaltedEMTs == 0
2310	\|\| uNsEarlyWakeUp2 > pGVMM->uNsNextEmtWakeup)
2311	return 0;
2312
2313	/*
2314	* Only one thread doing this at a time.
2315	*/
2316	if (!ASMAtomicCmpXchgBool(&pGVMM->fDoingEarlyWakeUps, true, false))
2317	return 0;
2318
2319	/*
2320	* The first pass will wake up VMs which have actually expired
2321	* and look for VMs that should be woken up in the 2nd and 3rd passes.
2322	*/
2323	const uint64_t uNsEarlyWakeUp1 = u64Now + pGVMM->nsEarlyWakeUp1;
2324	uint64_t u64Min = UINT64_MAX;
2325	unsigned cWoken = 0;
2326	unsigned cHalted = 0;
2327	unsigned cTodo2nd = 0;
2328	unsigned cTodo3rd = 0;
2329	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
2330	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
2331	i = pGVMM->aHandles[i].iNext)
2332	{
2333	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
2334	if ( RT_VALID_PTR(pCurGVM)
2335	&& pCurGVM->u32Magic == GVM_MAGIC)
2336	{
2337	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
2338	{
2339	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
2340	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
2341	if (u64)
2342	{
2343	if (u64 <= u64Now)
2344	{
2345	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
2346	{
2347	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
2348	AssertRC(rc);
2349	cWoken++;
2350	}
2351	}
2352	else
2353	{
2354	cHalted++;
2355	if (u64 <= uNsEarlyWakeUp1)
2356	cTodo2nd++;
2357	else if (u64 <= uNsEarlyWakeUp2)
2358	cTodo3rd++;
2359	else if (u64 < u64Min)
2360	u64 = u64Min;
2361	}
2362	}
2363	}
2364	}
2365	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
2366	}
2367
2368	if (cTodo2nd)
2369	{
2370	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
2371	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
2372	i = pGVMM->aHandles[i].iNext)
2373	{
2374	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
2375	if ( RT_VALID_PTR(pCurGVM)
2376	&& pCurGVM->u32Magic == GVM_MAGIC)
2377	{
2378	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
2379	{
2380	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
2381	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
2382	if ( u64
2383	&& u64 <= uNsEarlyWakeUp1)
2384	{
2385	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
2386	{
2387	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
2388	AssertRC(rc);
2389	cWoken++;
2390	}
2391	}
2392	}
2393	}
2394	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
2395	}
2396	}
2397
2398	if (cTodo3rd)
2399	{
2400	for (unsigned i = pGVMM->iUsedHead, cGuard = 0;
2401	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
2402	i = pGVMM->aHandles[i].iNext)
2403	{
2404	PGVM pCurGVM = pGVMM->aHandles[i].pGVM;
2405	if ( RT_VALID_PTR(pCurGVM)
2406	&& pCurGVM->u32Magic == GVM_MAGIC)
2407	{
2408	for (VMCPUID idCpu = 0; idCpu < pCurGVM->cCpus; idCpu++)
2409	{
2410	PGVMCPU pCurGVCpu = &pCurGVM->aCpus[idCpu];
2411	uint64_t u64 = ASMAtomicUoReadU64(&pCurGVCpu->gvmm.s.u64HaltExpire);
2412	if ( u64
2413	&& u64 <= uNsEarlyWakeUp2)
2414	{
2415	if (ASMAtomicXchgU64(&pCurGVCpu->gvmm.s.u64HaltExpire, 0))
2416	{
2417	int rc = RTSemEventMultiSignal(pCurGVCpu->gvmm.s.HaltEventMulti);
2418	AssertRC(rc);
2419	cWoken++;
2420	}
2421	}
2422	}
2423	}
2424	AssertLogRelBreak(cGuard++ < RT_ELEMENTS(pGVMM->aHandles));
2425	}
2426	}
2427
2428	/*
2429	* Set the minimum value.
2430	*/
2431	pGVMM->uNsNextEmtWakeup = u64Min;
2432
2433	ASMAtomicWriteBool(&pGVMM->fDoingEarlyWakeUps, false);
2434	return cWoken;
2435	}
2436
2437
2438	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
2439	/**
2440	* Timer callback for the EMT high-resolution wake-up timer.
2441	*
2442	* @param pTimer The timer handle.
2443	* @param pvUser The global (ring-0) CPU structure for the EMT to wake up.
2444	* @param iTick The current tick.
2445	*/
2446	static DECLCALLBACK(void) gvmmR0EmtWakeUpTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
2447	{
2448	PGVMCPU pGVCpu = (PGVMCPU)pvUser;
2449	NOREF(pTimer); NOREF(iTick);
2450
2451	pGVCpu->gvmm.s.fHrWakeUptimerArmed = false;
2452	if (pGVCpu->gvmm.s.u64HaltExpire != 0)
2453	{
2454	RTSemEventMultiSignal(pGVCpu->gvmm.s.HaltEventMulti);
2455	pGVCpu->gvmm.s.Stats.cWakeUpTimerHits += 1;
2456	}
2457	else
2458	pGVCpu->gvmm.s.Stats.cWakeUpTimerMisses += 1;
2459
2460	if (RTMpCpuId() == pGVCpu->gvmm.s.idHaltedOnCpu)
2461	pGVCpu->gvmm.s.Stats.cWakeUpTimerSameCpu += 1;
2462	}
2463	#endif /* GVMM_SCHED_WITH_HR_WAKE_UP_TIMER */
2464
2465
2466	/**
2467	* Halt the EMT thread.
2468	*
2469	* @returns VINF_SUCCESS normal wakeup (timeout or kicked by other thread).
2470	* VERR_INTERRUPTED if a signal was scheduled for the thread.
2471	* @param pGVM The global (ring-0) VM structure.
2472	* @param pGVCpu The global (ring-0) CPU structure of the calling
2473	* EMT.
2474	* @param u64ExpireGipTime The time for the sleep to expire expressed as GIP time.
2475	* @thread EMT(pGVCpu).
2476	*/
2477	GVMMR0DECL(int) GVMMR0SchedHalt(PGVM pGVM, PGVMCPU pGVCpu, uint64_t u64ExpireGipTime)
2478	{
2479	LogFlow(("GVMMR0SchedHalt: pGVM=%p pGVCpu=%p(%d) u64ExpireGipTime=%#RX64\n",
2480	pGVM, pGVCpu, pGVCpu->idCpu, u64ExpireGipTime));
2481	PGVMM pGVMM;
2482	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
2483
2484	pGVM->gvmm.s.StatsSched.cHaltCalls++;
2485	Assert(!pGVCpu->gvmm.s.u64HaltExpire);
2486
2487	/*
2488	* If we're doing early wake-ups, we must take the UsedList lock before we
2489	* start querying the current time.
2490	* Note! Interrupts must NOT be disabled at this point because we ask for GIP time!
2491	*/
2492	bool const fDoEarlyWakeUps = pGVMM->fDoEarlyWakeUps;
2493	if (fDoEarlyWakeUps)
2494	{
2495	int rc2 = GVMMR0_USED_SHARED_LOCK(pGVMM); AssertRC(rc2);
2496	}
2497
2498	/* GIP hack: We might are frequently sleeping for short intervals where the
2499	difference between GIP and system time matters on systems with high resolution
2500	system time. So, convert the input from GIP to System time in that case. */
2501	Assert(ASMGetFlags() & X86_EFL_IF);
2502	const uint64_t u64NowSys = RTTimeSystemNanoTS();
2503	const uint64_t u64NowGip = RTTimeNanoTS();
2504
2505	if (fDoEarlyWakeUps)
2506	pGVM->gvmm.s.StatsSched.cHaltWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64NowGip);
2507
2508	/*
2509	* Go to sleep if we must...
2510	* Cap the sleep time to 1 second to be on the safe side.
2511	*/
2512	int rc;
2513	uint64_t cNsInterval = u64ExpireGipTime - u64NowGip;
2514	if ( u64NowGip < u64ExpireGipTime
2515	&& ( cNsInterval >= (pGVMM->cEMTs > pGVMM->cEMTsMeansCompany
2516	? pGVMM->nsMinSleepCompany
2517	: pGVMM->nsMinSleepAlone)
2518	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
2519	\|\| (pGVCpu->gvmm.s.hHrWakeUpTimer != NULL && cNsInterval >= pGVMM->nsMinSleepWithHrTimer)
2520	#endif
2521	)
2522	)
2523	{
2524	pGVM->gvmm.s.StatsSched.cHaltBlocking++;
2525	if (cNsInterval > RT_NS_1SEC)
2526	u64ExpireGipTime = u64NowGip + RT_NS_1SEC;
2527	ASMAtomicWriteU64(&pGVCpu->gvmm.s.u64HaltExpire, u64ExpireGipTime);
2528	ASMAtomicIncU32(&pGVMM->cHaltedEMTs);
2529	if (fDoEarlyWakeUps)
2530	{
2531	if (u64ExpireGipTime < pGVMM->uNsNextEmtWakeup)
2532	pGVMM->uNsNextEmtWakeup = u64ExpireGipTime;
2533	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2534	}
2535
2536	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
2537	if ( pGVCpu->gvmm.s.hHrWakeUpTimer != NULL
2538	&& cNsInterval >= RT_MIN(RT_NS_1US, pGVMM->nsMinSleepWithHrTimer))
2539	{
2540	STAM_REL_PROFILE_START(&pGVCpu->gvmm.s.Stats.Start, a);
2541	RTTimerStart(pGVCpu->gvmm.s.hHrWakeUpTimer, cNsInterval);
2542	pGVCpu->gvmm.s.fHrWakeUptimerArmed = true;
2543	pGVCpu->gvmm.s.idHaltedOnCpu = RTMpCpuId();
2544	STAM_REL_PROFILE_STOP(&pGVCpu->gvmm.s.Stats.Start, a);
2545	}
2546	#endif
2547
2548	rc = RTSemEventMultiWaitEx(pGVCpu->gvmm.s.HaltEventMulti,
2549	RTSEMWAIT_FLAGS_ABSOLUTE \| RTSEMWAIT_FLAGS_NANOSECS \| RTSEMWAIT_FLAGS_INTERRUPTIBLE,
2550	u64NowGip > u64NowSys ? u64ExpireGipTime : u64NowSys + cNsInterval);
2551
2552	ASMAtomicWriteU64(&pGVCpu->gvmm.s.u64HaltExpire, 0);
2553	ASMAtomicDecU32(&pGVMM->cHaltedEMTs);
2554
2555	#ifdef GVMM_SCHED_WITH_HR_WAKE_UP_TIMER
2556	if (!pGVCpu->gvmm.s.fHrWakeUptimerArmed)
2557	{ /* likely */ }
2558	else
2559	{
2560	STAM_REL_PROFILE_START(&pGVCpu->gvmm.s.Stats.Stop, a);
2561	RTTimerStop(pGVCpu->gvmm.s.hHrWakeUpTimer);
2562	pGVCpu->gvmm.s.fHrWakeUptimerArmed = false;
2563	pGVCpu->gvmm.s.Stats.cWakeUpTimerCanceled += 1;
2564	STAM_REL_PROFILE_STOP(&pGVCpu->gvmm.s.Stats.Stop, a);
2565	}
2566	#endif
2567
2568	/* Reset the semaphore to try prevent a few false wake-ups. */
2569	if (rc == VINF_SUCCESS)
2570	RTSemEventMultiReset(pGVCpu->gvmm.s.HaltEventMulti);
2571	else if (rc == VERR_TIMEOUT)
2572	{
2573	pGVM->gvmm.s.StatsSched.cHaltTimeouts++;
2574	rc = VINF_SUCCESS;
2575	}
2576	}
2577	else
2578	{
2579	pGVM->gvmm.s.StatsSched.cHaltNotBlocking++;
2580	if (fDoEarlyWakeUps)
2581	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2582	RTSemEventMultiReset(pGVCpu->gvmm.s.HaltEventMulti);
2583	rc = VINF_SUCCESS;
2584	}
2585
2586	return rc;
2587	}
2588
2589
2590	/**
2591	* Halt the EMT thread.
2592	*
2593	* @returns VINF_SUCCESS normal wakeup (timeout or kicked by other thread).
2594	* VERR_INTERRUPTED if a signal was scheduled for the thread.
2595	* @param pGVM The global (ring-0) VM structure.
2596	* @param idCpu The Virtual CPU ID of the calling EMT.
2597	* @param u64ExpireGipTime The time for the sleep to expire expressed as GIP time.
2598	* @thread EMT(idCpu).
2599	*/
2600	GVMMR0DECL(int) GVMMR0SchedHaltReq(PGVM pGVM, VMCPUID idCpu, uint64_t u64ExpireGipTime)
2601	{
2602	PGVMM pGVMM;
2603	int rc = gvmmR0ByGVMandEMT(pGVM, idCpu, &pGVMM);
2604	if (RT_SUCCESS(rc))
2605	rc = GVMMR0SchedHalt(pGVM, &pGVM->aCpus[idCpu], u64ExpireGipTime);
2606	return rc;
2607	}
2608
2609
2610
2611	/**
2612	* Worker for GVMMR0SchedWakeUp and GVMMR0SchedWakeUpAndPokeCpus that wakes up
2613	* the a sleeping EMT.
2614	*
2615	* @retval VINF_SUCCESS if successfully woken up.
2616	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
2617	*
2618	* @param pGVM The global (ring-0) VM structure.
2619	* @param pGVCpu The global (ring-0) VCPU structure.
2620	*/
2621	DECLINLINE(int) gvmmR0SchedWakeUpOne(PGVM pGVM, PGVMCPU pGVCpu)
2622	{
2623	pGVM->gvmm.s.StatsSched.cWakeUpCalls++;
2624
2625	/*
2626	* Signal the semaphore regardless of whether it's current blocked on it.
2627	*
2628	* The reason for this is that there is absolutely no way we can be 100%
2629	* certain that it isn't about go to go to sleep on it and just got
2630	* delayed a bit en route. So, we will always signal the semaphore when
2631	* the it is flagged as halted in the VMM.
2632	*/
2633	/** @todo we can optimize some of that by means of the pVCpu->enmState now. */
2634	int rc;
2635	if (pGVCpu->gvmm.s.u64HaltExpire)
2636	{
2637	rc = VINF_SUCCESS;
2638	ASMAtomicWriteU64(&pGVCpu->gvmm.s.u64HaltExpire, 0);
2639	}
2640	else
2641	{
2642	rc = VINF_GVM_NOT_BLOCKED;
2643	pGVM->gvmm.s.StatsSched.cWakeUpNotHalted++;
2644	}
2645
2646	int rc2 = RTSemEventMultiSignal(pGVCpu->gvmm.s.HaltEventMulti);
2647	AssertRC(rc2);
2648
2649	return rc;
2650	}
2651
2652
2653	/**
2654	* Wakes up the halted EMT thread so it can service a pending request.
2655	*
2656	* @returns VBox status code.
2657	* @retval VINF_SUCCESS if successfully woken up.
2658	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
2659	*
2660	* @param pGVM The global (ring-0) VM structure.
2661	* @param idCpu The Virtual CPU ID of the EMT to wake up.
2662	* @param fTakeUsedLock Take the used lock or not
2663	* @thread Any but EMT(idCpu).
2664	*/
2665	GVMMR0DECL(int) GVMMR0SchedWakeUpEx(PGVM pGVM, VMCPUID idCpu, bool fTakeUsedLock)
2666	{
2667	/*
2668	* Validate input and take the UsedLock.
2669	*/
2670	PGVMM pGVMM;
2671	int rc = gvmmR0ByGVM(pGVM, &pGVMM, fTakeUsedLock);
2672	if (RT_SUCCESS(rc))
2673	{
2674	if (idCpu < pGVM->cCpus)
2675	{
2676	/*
2677	* Do the actual job.
2678	*/
2679	rc = gvmmR0SchedWakeUpOne(pGVM, &pGVM->aCpus[idCpu]);
2680
2681	if (fTakeUsedLock && pGVMM->fDoEarlyWakeUps)
2682	{
2683	/*
2684	* While we're here, do a round of scheduling.
2685	*/
2686	Assert(ASMGetFlags() & X86_EFL_IF);
2687	const uint64_t u64Now = RTTimeNanoTS(); /* (GIP time) */
2688	pGVM->gvmm.s.StatsSched.cWakeUpWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64Now);
2689	}
2690	}
2691	else
2692	rc = VERR_INVALID_CPU_ID;
2693
2694	if (fTakeUsedLock)
2695	{
2696	int rc2 = GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2697	AssertRC(rc2);
2698	}
2699	}
2700
2701	LogFlow(("GVMMR0SchedWakeUpEx: returns %Rrc\n", rc));
2702	return rc;
2703	}
2704
2705
2706	/**
2707	* Wakes up the halted EMT thread so it can service a pending request.
2708	*
2709	* @returns VBox status code.
2710	* @retval VINF_SUCCESS if successfully woken up.
2711	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
2712	*
2713	* @param pGVM The global (ring-0) VM structure.
2714	* @param idCpu The Virtual CPU ID of the EMT to wake up.
2715	* @thread Any but EMT(idCpu).
2716	*/
2717	GVMMR0DECL(int) GVMMR0SchedWakeUp(PGVM pGVM, VMCPUID idCpu)
2718	{
2719	return GVMMR0SchedWakeUpEx(pGVM, idCpu, true /* fTakeUsedLock */);
2720	}
2721
2722
2723	/**
2724	* Wakes up the halted EMT thread so it can service a pending request, no GVM
2725	* parameter and no used locking.
2726	*
2727	* @returns VBox status code.
2728	* @retval VINF_SUCCESS if successfully woken up.
2729	* @retval VINF_GVM_NOT_BLOCKED if the EMT wasn't blocked.
2730	*
2731	* @param pGVM The global (ring-0) VM structure.
2732	* @param idCpu The Virtual CPU ID of the EMT to wake up.
2733	* @thread Any but EMT(idCpu).
2734	* @deprecated Don't use in new code if possible! Use the GVM variant.
2735	*/
2736	GVMMR0DECL(int) GVMMR0SchedWakeUpNoGVMNoLock(PGVM pGVM, VMCPUID idCpu)
2737	{
2738	PGVMM pGVMM;
2739	int rc = gvmmR0ByGVM(pGVM, &pGVMM, false /fTakeUsedLock/);
2740	if (RT_SUCCESS(rc))
2741	rc = GVMMR0SchedWakeUpEx(pGVM, idCpu, false /fTakeUsedLock/);
2742	return rc;
2743	}
2744
2745
2746	/**
2747	* Worker common to GVMMR0SchedPoke and GVMMR0SchedWakeUpAndPokeCpus that pokes
2748	* the Virtual CPU if it's still busy executing guest code.
2749	*
2750	* @returns VBox status code.
2751	* @retval VINF_SUCCESS if poked successfully.
2752	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
2753	*
2754	* @param pGVM The global (ring-0) VM structure.
2755	* @param pVCpu The cross context virtual CPU structure.
2756	*/
2757	DECLINLINE(int) gvmmR0SchedPokeOne(PGVM pGVM, PVMCPUCC pVCpu)
2758	{
2759	pGVM->gvmm.s.StatsSched.cPokeCalls++;
2760
2761	RTCPUID idHostCpu = pVCpu->idHostCpu;
2762	if ( idHostCpu == NIL_RTCPUID
2763	\|\| VMCPU_GET_STATE(pVCpu) != VMCPUSTATE_STARTED_EXEC)
2764	{
2765	pGVM->gvmm.s.StatsSched.cPokeNotBusy++;
2766	return VINF_GVM_NOT_BUSY_IN_GC;
2767	}
2768
2769	/* Note: this function is not implemented on Darwin and Linux (kernel < 2.6.19) */
2770	RTMpPokeCpu(idHostCpu);
2771	return VINF_SUCCESS;
2772	}
2773
2774
2775	/**
2776	* Pokes an EMT if it's still busy running guest code.
2777	*
2778	* @returns VBox status code.
2779	* @retval VINF_SUCCESS if poked successfully.
2780	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
2781	*
2782	* @param pGVM The global (ring-0) VM structure.
2783	* @param idCpu The ID of the virtual CPU to poke.
2784	* @param fTakeUsedLock Take the used lock or not
2785	*/
2786	GVMMR0DECL(int) GVMMR0SchedPokeEx(PGVM pGVM, VMCPUID idCpu, bool fTakeUsedLock)
2787	{
2788	/*
2789	* Validate input and take the UsedLock.
2790	*/
2791	PGVMM pGVMM;
2792	int rc = gvmmR0ByGVM(pGVM, &pGVMM, fTakeUsedLock);
2793	if (RT_SUCCESS(rc))
2794	{
2795	if (idCpu < pGVM->cCpus)
2796	rc = gvmmR0SchedPokeOne(pGVM, &pGVM->aCpus[idCpu]);
2797	else
2798	rc = VERR_INVALID_CPU_ID;
2799
2800	if (fTakeUsedLock)
2801	{
2802	int rc2 = GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2803	AssertRC(rc2);
2804	}
2805	}
2806
2807	LogFlow(("GVMMR0SchedWakeUpAndPokeCpus: returns %Rrc\n", rc));
2808	return rc;
2809	}
2810
2811
2812	/**
2813	* Pokes an EMT if it's still busy running guest code.
2814	*
2815	* @returns VBox status code.
2816	* @retval VINF_SUCCESS if poked successfully.
2817	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
2818	*
2819	* @param pGVM The global (ring-0) VM structure.
2820	* @param idCpu The ID of the virtual CPU to poke.
2821	*/
2822	GVMMR0DECL(int) GVMMR0SchedPoke(PGVM pGVM, VMCPUID idCpu)
2823	{
2824	return GVMMR0SchedPokeEx(pGVM, idCpu, true /* fTakeUsedLock */);
2825	}
2826
2827
2828	/**
2829	* Pokes an EMT if it's still busy running guest code, no GVM parameter and no
2830	* used locking.
2831	*
2832	* @returns VBox status code.
2833	* @retval VINF_SUCCESS if poked successfully.
2834	* @retval VINF_GVM_NOT_BUSY_IN_GC if the EMT wasn't busy in GC.
2835	*
2836	* @param pGVM The global (ring-0) VM structure.
2837	* @param idCpu The ID of the virtual CPU to poke.
2838	*
2839	* @deprecated Don't use in new code if possible! Use the GVM variant.
2840	*/
2841	GVMMR0DECL(int) GVMMR0SchedPokeNoGVMNoLock(PGVM pGVM, VMCPUID idCpu)
2842	{
2843	PGVMM pGVMM;
2844	int rc = gvmmR0ByGVM(pGVM, &pGVMM, false /fTakeUsedLock/);
2845	if (RT_SUCCESS(rc))
2846	{
2847	if (idCpu < pGVM->cCpus)
2848	rc = gvmmR0SchedPokeOne(pGVM, &pGVM->aCpus[idCpu]);
2849	else
2850	rc = VERR_INVALID_CPU_ID;
2851	}
2852	return rc;
2853	}
2854
2855
2856	/**
2857	* Wakes up a set of halted EMT threads so they can service pending request.
2858	*
2859	* @returns VBox status code, no informational stuff.
2860	*
2861	* @param pGVM The global (ring-0) VM structure.
2862	* @param pSleepSet The set of sleepers to wake up.
2863	* @param pPokeSet The set of CPUs to poke.
2864	*/
2865	GVMMR0DECL(int) GVMMR0SchedWakeUpAndPokeCpus(PGVM pGVM, PCVMCPUSET pSleepSet, PCVMCPUSET pPokeSet)
2866	{
2867	AssertPtrReturn(pSleepSet, VERR_INVALID_POINTER);
2868	AssertPtrReturn(pPokeSet, VERR_INVALID_POINTER);
2869	RTNATIVETHREAD hSelf = RTThreadNativeSelf();
2870
2871	/*
2872	* Validate input and take the UsedLock.
2873	*/
2874	PGVMM pGVMM;
2875	int rc = gvmmR0ByGVM(pGVM, &pGVMM, true /* fTakeUsedLock */);
2876	if (RT_SUCCESS(rc))
2877	{
2878	rc = VINF_SUCCESS;
2879	VMCPUID idCpu = pGVM->cCpus;
2880	while (idCpu-- > 0)
2881	{
2882	/* Don't try poke or wake up ourselves. */
2883	if (pGVM->aCpus[idCpu].hEMT == hSelf)
2884	continue;
2885
2886	/* just ignore errors for now. */
2887	if (VMCPUSET_IS_PRESENT(pSleepSet, idCpu))
2888	gvmmR0SchedWakeUpOne(pGVM, &pGVM->aCpus[idCpu]);
2889	else if (VMCPUSET_IS_PRESENT(pPokeSet, idCpu))
2890	gvmmR0SchedPokeOne(pGVM, &pGVM->aCpus[idCpu]);
2891	}
2892
2893	int rc2 = GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2894	AssertRC(rc2);
2895	}
2896
2897	LogFlow(("GVMMR0SchedWakeUpAndPokeCpus: returns %Rrc\n", rc));
2898	return rc;
2899	}
2900
2901
2902	/**
2903	* VMMR0 request wrapper for GVMMR0SchedWakeUpAndPokeCpus.
2904	*
2905	* @returns see GVMMR0SchedWakeUpAndPokeCpus.
2906	* @param pGVM The global (ring-0) VM structure.
2907	* @param pReq Pointer to the request packet.
2908	*/
2909	GVMMR0DECL(int) GVMMR0SchedWakeUpAndPokeCpusReq(PGVM pGVM, PGVMMSCHEDWAKEUPANDPOKECPUSREQ pReq)
2910	{
2911	/*
2912	* Validate input and pass it on.
2913	*/
2914	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
2915	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
2916
2917	return GVMMR0SchedWakeUpAndPokeCpus(pGVM, &pReq->SleepSet, &pReq->PokeSet);
2918	}
2919
2920
2921
2922	/**
2923	* Poll the schedule to see if someone else should get a chance to run.
2924	*
2925	* This is a bit hackish and will not work too well if the machine is
2926	* under heavy load from non-VM processes.
2927	*
2928	* @returns VINF_SUCCESS if not yielded.
2929	* VINF_GVM_YIELDED if an attempt to switch to a different VM task was made.
2930	* @param pGVM The global (ring-0) VM structure.
2931	* @param idCpu The Virtual CPU ID of the calling EMT.
2932	* @param fYield Whether to yield or not.
2933	* This is for when we're spinning in the halt loop.
2934	* @thread EMT(idCpu).
2935	*/
2936	GVMMR0DECL(int) GVMMR0SchedPoll(PGVM pGVM, VMCPUID idCpu, bool fYield)
2937	{
2938	/*
2939	* Validate input.
2940	*/
2941	PGVMM pGVMM;
2942	int rc = gvmmR0ByGVMandEMT(pGVM, idCpu, &pGVMM);
2943	if (RT_SUCCESS(rc))
2944	{
2945	/*
2946	* We currently only implement helping doing wakeups (fYield = false), so don't
2947	* bother taking the lock if gvmmR0SchedDoWakeUps is not going to do anything.
2948	*/
2949	if (!fYield && pGVMM->fDoEarlyWakeUps)
2950	{
2951	rc = GVMMR0_USED_SHARED_LOCK(pGVMM); AssertRC(rc);
2952	pGVM->gvmm.s.StatsSched.cPollCalls++;
2953
2954	Assert(ASMGetFlags() & X86_EFL_IF);
2955	const uint64_t u64Now = RTTimeNanoTS(); /* (GIP time) */
2956
2957	pGVM->gvmm.s.StatsSched.cPollWakeUps += gvmmR0SchedDoWakeUps(pGVMM, u64Now);
2958
2959	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
2960	}
2961	/*
2962	* Not quite sure what we could do here...
2963	*/
2964	else if (fYield)
2965	rc = VERR_NOT_IMPLEMENTED; /** @todo implement this... */
2966	else
2967	rc = VINF_SUCCESS;
2968	}
2969
2970	LogFlow(("GVMMR0SchedWakeUp: returns %Rrc\n", rc));
2971	return rc;
2972	}
2973
2974
2975	#ifdef GVMM_SCHED_WITH_PPT
2976	/**
2977	* Timer callback for the periodic preemption timer.
2978	*
2979	* @param pTimer The timer handle.
2980	* @param pvUser Pointer to the per cpu structure.
2981	* @param iTick The current tick.
2982	*/
2983	static DECLCALLBACK(void) gvmmR0SchedPeriodicPreemptionTimerCallback(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
2984	{
2985	PGVMMHOSTCPU pCpu = (PGVMMHOSTCPU)pvUser;
2986	NOREF(pTimer); NOREF(iTick);
2987
2988	/*
2989	* Termination check
2990	*/
2991	if (pCpu->u32Magic != GVMMHOSTCPU_MAGIC)
2992	return;
2993
2994	/*
2995	* Do the house keeping.
2996	*/
2997	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
2998
2999	if (++pCpu->Ppt.iTickHistorization >= pCpu->Ppt.cTicksHistoriziationInterval)
3000	{
3001	/*
3002	* Historicize the max frequency.
3003	*/
3004	uint32_t iHzHistory = ++pCpu->Ppt.iHzHistory % RT_ELEMENTS(pCpu->Ppt.aHzHistory);
3005	pCpu->Ppt.aHzHistory[iHzHistory] = pCpu->Ppt.uDesiredHz;
3006	pCpu->Ppt.iTickHistorization = 0;
3007	pCpu->Ppt.uDesiredHz = 0;
3008
3009	/*
3010	* Check if the current timer frequency.
3011	*/
3012	uint32_t uHistMaxHz = 0;
3013	for (uint32_t i = 0; i < RT_ELEMENTS(pCpu->Ppt.aHzHistory); i++)
3014	if (pCpu->Ppt.aHzHistory[i] > uHistMaxHz)
3015	uHistMaxHz = pCpu->Ppt.aHzHistory[i];
3016	if (uHistMaxHz == pCpu->Ppt.uTimerHz)
3017	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3018	else if (uHistMaxHz)
3019	{
3020	/*
3021	* Reprogram it.
3022	*/
3023	pCpu->Ppt.cChanges++;
3024	pCpu->Ppt.iTickHistorization = 0;
3025	pCpu->Ppt.uTimerHz = uHistMaxHz;
3026	uint32_t const cNsInterval = RT_NS_1SEC / uHistMaxHz;
3027	pCpu->Ppt.cNsInterval = cNsInterval;
3028	if (cNsInterval < GVMMHOSTCPU_PPT_HIST_INTERVAL_NS)
3029	pCpu->Ppt.cTicksHistoriziationInterval = ( GVMMHOSTCPU_PPT_HIST_INTERVAL_NS
3030	+ GVMMHOSTCPU_PPT_HIST_INTERVAL_NS / 2 - 1)
3031	/ cNsInterval;
3032	else
3033	pCpu->Ppt.cTicksHistoriziationInterval = 1;
3034	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3035
3036	/SUPR0Printf("Cpu%u: change to %u Hz / %u ns\n", pCpu->idxCpuSet, uHistMaxHz, cNsInterval);/
3037	RTTimerChangeInterval(pTimer, cNsInterval);
3038	}
3039	else
3040	{
3041	/*
3042	* Stop it.
3043	*/
3044	pCpu->Ppt.fStarted = false;
3045	pCpu->Ppt.uTimerHz = 0;
3046	pCpu->Ppt.cNsInterval = 0;
3047	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3048
3049	/SUPR0Printf("Cpu%u: stopping (%u Hz)\n", pCpu->idxCpuSet, uHistMaxHz);/
3050	RTTimerStop(pTimer);
3051	}
3052	}
3053	else
3054	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3055	}
3056	#endif /* GVMM_SCHED_WITH_PPT */
3057
3058
3059	/**
3060	* Updates the periodic preemption timer for the calling CPU.
3061	*
3062	* The caller must have disabled preemption!
3063	* The caller must check that the host can do high resolution timers.
3064	*
3065	* @param pGVM The global (ring-0) VM structure.
3066	* @param idHostCpu The current host CPU id.
3067	* @param uHz The desired frequency.
3068	*/
3069	GVMMR0DECL(void) GVMMR0SchedUpdatePeriodicPreemptionTimer(PGVM pGVM, RTCPUID idHostCpu, uint32_t uHz)
3070	{
3071	NOREF(pGVM);
3072	#ifdef GVMM_SCHED_WITH_PPT
3073	Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
3074	Assert(RTTimerCanDoHighResolution());
3075
3076	/*
3077	* Resolve the per CPU data.
3078	*/
3079	uint32_t iCpu = RTMpCpuIdToSetIndex(idHostCpu);
3080	PGVMM pGVMM = g_pGVMM;
3081	if ( !RT_VALID_PTR(pGVMM)
3082	\|\| pGVMM->u32Magic != GVMM_MAGIC)
3083	return;
3084	AssertMsgReturnVoid(iCpu < pGVMM->cHostCpus, ("iCpu=%d cHostCpus=%d\n", iCpu, pGVMM->cHostCpus));
3085	PGVMMHOSTCPU pCpu = &pGVMM->aHostCpus[iCpu];
3086	AssertMsgReturnVoid( pCpu->u32Magic == GVMMHOSTCPU_MAGIC
3087	&& pCpu->idCpu == idHostCpu,
3088	("u32Magic=%#x idCpu=% idHostCpu=%d\n", pCpu->u32Magic, pCpu->idCpu, idHostCpu));
3089
3090	/*
3091	* Check whether we need to do anything about the timer.
3092	* We have to be a little bit careful since we might be race the timer
3093	* callback here.
3094	*/
3095	if (uHz > 16384)
3096	uHz = 16384; /** @todo add a query method for this! */
3097	if (RT_UNLIKELY( uHz > ASMAtomicReadU32(&pCpu->Ppt.uDesiredHz)
3098	&& uHz >= pCpu->Ppt.uMinHz
3099	&& !pCpu->Ppt.fStarting /* solaris paranoia */))
3100	{
3101	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
3102
3103	pCpu->Ppt.uDesiredHz = uHz;
3104	uint32_t cNsInterval = 0;
3105	if (!pCpu->Ppt.fStarted)
3106	{
3107	pCpu->Ppt.cStarts++;
3108	pCpu->Ppt.fStarted = true;
3109	pCpu->Ppt.fStarting = true;
3110	pCpu->Ppt.iTickHistorization = 0;
3111	pCpu->Ppt.uTimerHz = uHz;
3112	pCpu->Ppt.cNsInterval = cNsInterval = RT_NS_1SEC / uHz;
3113	if (cNsInterval < GVMMHOSTCPU_PPT_HIST_INTERVAL_NS)
3114	pCpu->Ppt.cTicksHistoriziationInterval = ( GVMMHOSTCPU_PPT_HIST_INTERVAL_NS
3115	+ GVMMHOSTCPU_PPT_HIST_INTERVAL_NS / 2 - 1)
3116	/ cNsInterval;
3117	else
3118	pCpu->Ppt.cTicksHistoriziationInterval = 1;
3119	}
3120
3121	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3122
3123	if (cNsInterval)
3124	{
3125	RTTimerChangeInterval(pCpu->Ppt.pTimer, cNsInterval);
3126	int rc = RTTimerStart(pCpu->Ppt.pTimer, cNsInterval);
3127	AssertRC(rc);
3128
3129	RTSpinlockAcquire(pCpu->Ppt.hSpinlock);
3130	if (RT_FAILURE(rc))
3131	pCpu->Ppt.fStarted = false;
3132	pCpu->Ppt.fStarting = false;
3133	RTSpinlockRelease(pCpu->Ppt.hSpinlock);
3134	}
3135	}
3136	#else /* !GVMM_SCHED_WITH_PPT */
3137	NOREF(idHostCpu); NOREF(uHz);
3138	#endif /* !GVMM_SCHED_WITH_PPT */
3139	}
3140
3141
3142	/**
3143	* Calls @a pfnCallback for each VM in the system.
3144	*
3145	* This will enumerate the VMs while holding the global VM used list lock in
3146	* shared mode. So, only suitable for simple work. If more expensive work
3147	* needs doing, a different approach must be taken as using this API would
3148	* otherwise block VM creation and destruction.
3149	*
3150	* @returns VBox status code.
3151	* @param pfnCallback The callback function.
3152	* @param pvUser User argument to the callback.
3153	*/
3154	GVMMR0DECL(int) GVMMR0EnumVMs(PFNGVMMR0ENUMCALLBACK pfnCallback, void *pvUser)
3155	{
3156	PGVMM pGVMM;
3157	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
3158
3159	int rc = VINF_SUCCESS;
3160	GVMMR0_USED_SHARED_LOCK(pGVMM);
3161	for (unsigned i = pGVMM->iUsedHead, cLoops = 0;
3162	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
3163	i = pGVMM->aHandles[i].iNext, cLoops++)
3164	{
3165	PGVM pGVM = pGVMM->aHandles[i].pGVM;
3166	if ( RT_VALID_PTR(pGVM)
3167	&& RT_VALID_PTR(pGVMM->aHandles[i].pvObj)
3168	&& pGVM->u32Magic == GVM_MAGIC)
3169	{
3170	rc = pfnCallback(pGVM, pvUser);
3171	if (rc != VINF_SUCCESS)
3172	break;
3173	}
3174
3175	AssertBreak(cLoops < RT_ELEMENTS(pGVMM->aHandles) * 4); /* paranoia */
3176	}
3177	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
3178	return rc;
3179	}
3180
3181
3182	/**
3183	* Retrieves the GVMM statistics visible to the caller.
3184	*
3185	* @returns VBox status code.
3186	*
3187	* @param pStats Where to put the statistics.
3188	* @param pSession The current session.
3189	* @param pGVM The GVM to obtain statistics for. Optional.
3190	*/
3191	GVMMR0DECL(int) GVMMR0QueryStatistics(PGVMMSTATS pStats, PSUPDRVSESSION pSession, PGVM pGVM)
3192	{
3193	LogFlow(("GVMMR0QueryStatistics: pStats=%p pSession=%p pGVM=%p\n", pStats, pSession, pGVM));
3194
3195	/*
3196	* Validate input.
3197	*/
3198	AssertPtrReturn(pSession, VERR_INVALID_POINTER);
3199	AssertPtrReturn(pStats, VERR_INVALID_POINTER);
3200	pStats->cVMs = 0; /* (crash before taking the sem...) */
3201
3202	/*
3203	* Take the lock and get the VM statistics.
3204	*/
3205	PGVMM pGVMM;
3206	if (pGVM)
3207	{
3208	int rc = gvmmR0ByGVM(pGVM, &pGVMM, true /fTakeUsedLock/);
3209	if (RT_FAILURE(rc))
3210	return rc;
3211	pStats->SchedVM = pGVM->gvmm.s.StatsSched;
3212
3213	uint32_t iCpu = RT_MIN(pGVM->cCpus, RT_ELEMENTS(pStats->aVCpus));
3214	if (iCpu < RT_ELEMENTS(pStats->aVCpus))
3215	RT_BZERO(&pStats->aVCpus[iCpu], (RT_ELEMENTS(pStats->aVCpus) - iCpu) * sizeof(pStats->aVCpus[0]));
3216	while (iCpu-- > 0)
3217	pStats->aVCpus[iCpu] = pGVM->aCpus[iCpu].gvmm.s.Stats;
3218	}
3219	else
3220	{
3221	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
3222	RT_ZERO(pStats->SchedVM);
3223	RT_ZERO(pStats->aVCpus);
3224
3225	int rc = GVMMR0_USED_SHARED_LOCK(pGVMM);
3226	AssertRCReturn(rc, rc);
3227	}
3228
3229	/*
3230	* Enumerate the VMs and add the ones visible to the statistics.
3231	*/
3232	pStats->cVMs = 0;
3233	pStats->cEMTs = 0;
3234	memset(&pStats->SchedSum, 0, sizeof(pStats->SchedSum));
3235
3236	for (unsigned i = pGVMM->iUsedHead;
3237	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
3238	i = pGVMM->aHandles[i].iNext)
3239	{
3240	PGVM pOtherGVM = pGVMM->aHandles[i].pGVM;
3241	void *pvObj = pGVMM->aHandles[i].pvObj;
3242	if ( RT_VALID_PTR(pvObj)
3243	&& RT_VALID_PTR(pOtherGVM)
3244	&& pOtherGVM->u32Magic == GVM_MAGIC
3245	&& RT_SUCCESS(SUPR0ObjVerifyAccess(pvObj, pSession, NULL)))
3246	{
3247	pStats->cVMs++;
3248	pStats->cEMTs += pOtherGVM->cCpus;
3249
3250	pStats->SchedSum.cHaltCalls += pOtherGVM->gvmm.s.StatsSched.cHaltCalls;
3251	pStats->SchedSum.cHaltBlocking += pOtherGVM->gvmm.s.StatsSched.cHaltBlocking;
3252	pStats->SchedSum.cHaltTimeouts += pOtherGVM->gvmm.s.StatsSched.cHaltTimeouts;
3253	pStats->SchedSum.cHaltNotBlocking += pOtherGVM->gvmm.s.StatsSched.cHaltNotBlocking;
3254	pStats->SchedSum.cHaltWakeUps += pOtherGVM->gvmm.s.StatsSched.cHaltWakeUps;
3255
3256	pStats->SchedSum.cWakeUpCalls += pOtherGVM->gvmm.s.StatsSched.cWakeUpCalls;
3257	pStats->SchedSum.cWakeUpNotHalted += pOtherGVM->gvmm.s.StatsSched.cWakeUpNotHalted;
3258	pStats->SchedSum.cWakeUpWakeUps += pOtherGVM->gvmm.s.StatsSched.cWakeUpWakeUps;
3259
3260	pStats->SchedSum.cPokeCalls += pOtherGVM->gvmm.s.StatsSched.cPokeCalls;
3261	pStats->SchedSum.cPokeNotBusy += pOtherGVM->gvmm.s.StatsSched.cPokeNotBusy;
3262
3263	pStats->SchedSum.cPollCalls += pOtherGVM->gvmm.s.StatsSched.cPollCalls;
3264	pStats->SchedSum.cPollHalts += pOtherGVM->gvmm.s.StatsSched.cPollHalts;
3265	pStats->SchedSum.cPollWakeUps += pOtherGVM->gvmm.s.StatsSched.cPollWakeUps;
3266	}
3267	}
3268
3269	/*
3270	* Copy out the per host CPU statistics.
3271	*/
3272	uint32_t iDstCpu = 0;
3273	uint32_t cSrcCpus = pGVMM->cHostCpus;
3274	for (uint32_t iSrcCpu = 0; iSrcCpu < cSrcCpus; iSrcCpu++)
3275	{
3276	if (pGVMM->aHostCpus[iSrcCpu].idCpu != NIL_RTCPUID)
3277	{
3278	pStats->aHostCpus[iDstCpu].idCpu = pGVMM->aHostCpus[iSrcCpu].idCpu;
3279	pStats->aHostCpus[iDstCpu].idxCpuSet = pGVMM->aHostCpus[iSrcCpu].idxCpuSet;
3280	#ifdef GVMM_SCHED_WITH_PPT
3281	pStats->aHostCpus[iDstCpu].uDesiredHz = pGVMM->aHostCpus[iSrcCpu].Ppt.uDesiredHz;
3282	pStats->aHostCpus[iDstCpu].uTimerHz = pGVMM->aHostCpus[iSrcCpu].Ppt.uTimerHz;
3283	pStats->aHostCpus[iDstCpu].cChanges = pGVMM->aHostCpus[iSrcCpu].Ppt.cChanges;
3284	pStats->aHostCpus[iDstCpu].cStarts = pGVMM->aHostCpus[iSrcCpu].Ppt.cStarts;
3285	#else
3286	pStats->aHostCpus[iDstCpu].uDesiredHz = 0;
3287	pStats->aHostCpus[iDstCpu].uTimerHz = 0;
3288	pStats->aHostCpus[iDstCpu].cChanges = 0;
3289	pStats->aHostCpus[iDstCpu].cStarts = 0;
3290	#endif
3291	iDstCpu++;
3292	if (iDstCpu >= RT_ELEMENTS(pStats->aHostCpus))
3293	break;
3294	}
3295	}
3296	pStats->cHostCpus = iDstCpu;
3297
3298	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
3299
3300	return VINF_SUCCESS;
3301	}
3302
3303
3304	/**
3305	* VMMR0 request wrapper for GVMMR0QueryStatistics.
3306	*
3307	* @returns see GVMMR0QueryStatistics.
3308	* @param pGVM The global (ring-0) VM structure. Optional.
3309	* @param pReq Pointer to the request packet.
3310	* @param pSession The current session.
3311	*/
3312	GVMMR0DECL(int) GVMMR0QueryStatisticsReq(PGVM pGVM, PGVMMQUERYSTATISTICSSREQ pReq, PSUPDRVSESSION pSession)
3313	{
3314	/*
3315	* Validate input and pass it on.
3316	*/
3317	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
3318	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
3319	AssertReturn(pReq->pSession == pSession, VERR_INVALID_PARAMETER);
3320
3321	return GVMMR0QueryStatistics(&pReq->Stats, pSession, pGVM);
3322	}
3323
3324
3325	/**
3326	* Resets the specified GVMM statistics.
3327	*
3328	* @returns VBox status code.
3329	*
3330	* @param pStats Which statistics to reset, that is, non-zero fields indicates which to reset.
3331	* @param pSession The current session.
3332	* @param pGVM The GVM to reset statistics for. Optional.
3333	*/
3334	GVMMR0DECL(int) GVMMR0ResetStatistics(PCGVMMSTATS pStats, PSUPDRVSESSION pSession, PGVM pGVM)
3335	{
3336	LogFlow(("GVMMR0ResetStatistics: pStats=%p pSession=%p pGVM=%p\n", pStats, pSession, pGVM));
3337
3338	/*
3339	* Validate input.
3340	*/
3341	AssertPtrReturn(pSession, VERR_INVALID_POINTER);
3342	AssertPtrReturn(pStats, VERR_INVALID_POINTER);
3343
3344	/*
3345	* Take the lock and get the VM statistics.
3346	*/
3347	PGVMM pGVMM;
3348	if (pGVM)
3349	{
3350	int rc = gvmmR0ByGVM(pGVM, &pGVMM, true /fTakeUsedLock/);
3351	if (RT_FAILURE(rc))
3352	return rc;
3353	# define MAYBE_RESET_FIELD(field) \
3354	do { if (pStats->SchedVM. field ) { pGVM->gvmm.s.StatsSched. field = 0; } } while (0)
3355	MAYBE_RESET_FIELD(cHaltCalls);
3356	MAYBE_RESET_FIELD(cHaltBlocking);
3357	MAYBE_RESET_FIELD(cHaltTimeouts);
3358	MAYBE_RESET_FIELD(cHaltNotBlocking);
3359	MAYBE_RESET_FIELD(cHaltWakeUps);
3360	MAYBE_RESET_FIELD(cWakeUpCalls);
3361	MAYBE_RESET_FIELD(cWakeUpNotHalted);
3362	MAYBE_RESET_FIELD(cWakeUpWakeUps);
3363	MAYBE_RESET_FIELD(cPokeCalls);
3364	MAYBE_RESET_FIELD(cPokeNotBusy);
3365	MAYBE_RESET_FIELD(cPollCalls);
3366	MAYBE_RESET_FIELD(cPollHalts);
3367	MAYBE_RESET_FIELD(cPollWakeUps);
3368	# undef MAYBE_RESET_FIELD
3369	}
3370	else
3371	{
3372	GVMM_GET_VALID_INSTANCE(pGVMM, VERR_GVMM_INSTANCE);
3373
3374	int rc = GVMMR0_USED_SHARED_LOCK(pGVMM);
3375	AssertRCReturn(rc, rc);
3376	}
3377
3378	/*
3379	* Enumerate the VMs and add the ones visible to the statistics.
3380	*/
3381	if (!ASMMemIsZero(&pStats->SchedSum, sizeof(pStats->SchedSum)))
3382	{
3383	for (unsigned i = pGVMM->iUsedHead;
3384	i != NIL_GVM_HANDLE && i < RT_ELEMENTS(pGVMM->aHandles);
3385	i = pGVMM->aHandles[i].iNext)
3386	{
3387	PGVM pOtherGVM = pGVMM->aHandles[i].pGVM;
3388	void *pvObj = pGVMM->aHandles[i].pvObj;
3389	if ( RT_VALID_PTR(pvObj)
3390	&& RT_VALID_PTR(pOtherGVM)
3391	&& pOtherGVM->u32Magic == GVM_MAGIC
3392	&& RT_SUCCESS(SUPR0ObjVerifyAccess(pvObj, pSession, NULL)))
3393	{
3394	# define MAYBE_RESET_FIELD(field) \
3395	do { if (pStats->SchedSum. field ) { pOtherGVM->gvmm.s.StatsSched. field = 0; } } while (0)
3396	MAYBE_RESET_FIELD(cHaltCalls);
3397	MAYBE_RESET_FIELD(cHaltBlocking);
3398	MAYBE_RESET_FIELD(cHaltTimeouts);
3399	MAYBE_RESET_FIELD(cHaltNotBlocking);
3400	MAYBE_RESET_FIELD(cHaltWakeUps);
3401	MAYBE_RESET_FIELD(cWakeUpCalls);
3402	MAYBE_RESET_FIELD(cWakeUpNotHalted);
3403	MAYBE_RESET_FIELD(cWakeUpWakeUps);
3404	MAYBE_RESET_FIELD(cPokeCalls);
3405	MAYBE_RESET_FIELD(cPokeNotBusy);
3406	MAYBE_RESET_FIELD(cPollCalls);
3407	MAYBE_RESET_FIELD(cPollHalts);
3408	MAYBE_RESET_FIELD(cPollWakeUps);
3409	# undef MAYBE_RESET_FIELD
3410	}
3411	}
3412	}
3413
3414	GVMMR0_USED_SHARED_UNLOCK(pGVMM);
3415
3416	return VINF_SUCCESS;
3417	}
3418
3419
3420	/**
3421	* VMMR0 request wrapper for GVMMR0ResetStatistics.
3422	*
3423	* @returns see GVMMR0ResetStatistics.
3424	* @param pGVM The global (ring-0) VM structure. Optional.
3425	* @param pReq Pointer to the request packet.
3426	* @param pSession The current session.
3427	*/
3428	GVMMR0DECL(int) GVMMR0ResetStatisticsReq(PGVM pGVM, PGVMMRESETSTATISTICSSREQ pReq, PSUPDRVSESSION pSession)
3429	{
3430	/*
3431	* Validate input and pass it on.
3432	*/
3433	AssertPtrReturn(pReq, VERR_INVALID_POINTER);
3434	AssertMsgReturn(pReq->Hdr.cbReq == sizeof(pReq), ("%#x != %#x\n", pReq->Hdr.cbReq, sizeof(pReq)), VERR_INVALID_PARAMETER);
3435	AssertReturn(pReq->pSession == pSession, VERR_INVALID_PARAMETER);
3436
3437	return GVMMR0ResetStatistics(&pReq->Stats, pSession, pGVM);
3438	}
3439

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source: vbox/trunk/src/VBox/VMM/VMMR0/GVMMR0.cpp@ 101521

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