VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMR3/NEMR3.cpp@ 92155

Last change on this file since 92155 was 92120, checked in by vboxsync, 3 years ago

VMM/NEM/win: New approach to A20: Reschedule to IEM. Logging. bugref:10122
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1/* $Id: NEMR3.cpp 92120 2021-10-28 00:31:35Z vboxsync $ */
2/** @file
3 * NEM - Native execution manager.
4 */
5
6/*
7 * Copyright (C) 2018-2020 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18/** @page pg_nem NEM - Native Execution Manager.
19 *
20 * This is an alternative execution manage to HM and raw-mode. On one host
21 * (Windows) we're forced to use this, on the others we just do it because we
22 * can. Since this is host specific in nature, information about an
23 * implementation is contained in the NEMR3Native-xxxx.cpp files.
24 *
25 * @ref pg_nem_win
26 */
27
28
29/*********************************************************************************************************************************
30* Header Files *
31*********************************************************************************************************************************/
32#define LOG_GROUP LOG_GROUP_NEM
33#include <VBox/vmm/nem.h>
34#include <VBox/vmm/gim.h>
35#include "NEMInternal.h"
36#include <VBox/vmm/vm.h>
37#include <VBox/vmm/uvm.h>
38#include <VBox/err.h>
39
40#include <iprt/asm.h>
41
42
43
44/**
45 * Basic init and configuration reading.
46 *
47 * Always call NEMR3Term after calling this.
48 *
49 * @returns VBox status code.
50 * @param pVM The cross context VM structure.
51 */
52VMMR3_INT_DECL(int) NEMR3InitConfig(PVM pVM)
53{
54 LogFlow(("NEMR3Init\n"));
55
56 /*
57 * Assert alignment and sizes.
58 */
59 AssertCompileMemberAlignment(VM, nem.s, 64);
60 AssertCompile(sizeof(pVM->nem.s) <= sizeof(pVM->nem.padding));
61
62 /*
63 * Initialize state info so NEMR3Term will always be happy.
64 * No returning prior to setting magics!
65 */
66 pVM->nem.s.u32Magic = NEM_MAGIC;
67 for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
68 {
69 PVMCPU pVCpu = pVM->apCpusR3[idCpu];
70 pVCpu->nem.s.u32Magic = NEMCPU_MAGIC;
71 }
72
73 /*
74 * Read configuration.
75 */
76 PCFGMNODE pCfgNem = CFGMR3GetChild(CFGMR3GetRoot(pVM), "NEM/");
77
78 /*
79 * Validate the NEM settings.
80 */
81 int rc = CFGMR3ValidateConfig(pCfgNem,
82 "/NEM/",
83 "Enabled"
84 "|Allow64BitGuests"
85 "|LovelyMesaDrvWorkaround"
86#ifdef RT_OS_WINDOWS
87 "|UseRing0Runloop"
88#endif
89 ,
90 "" /* pszValidNodes */, "NEM" /* pszWho */, 0 /* uInstance */);
91 if (RT_FAILURE(rc))
92 return rc;
93
94 /** @cfgm{/NEM/NEMEnabled, bool, true}
95 * Whether NEM is enabled. */
96 rc = CFGMR3QueryBoolDef(pCfgNem, "Enabled", &pVM->nem.s.fEnabled, true);
97 AssertLogRelRCReturn(rc, rc);
98
99
100#ifdef VBOX_WITH_64_BITS_GUESTS
101 /** @cfgm{/NEM/Allow64BitGuests, bool, 32-bit:false, 64-bit:true}
102 * Enables AMD64 CPU features.
103 * On 32-bit hosts this isn't default and require host CPU support. 64-bit hosts
104 * already have the support. */
105 rc = CFGMR3QueryBoolDef(pCfgNem, "Allow64BitGuests", &pVM->nem.s.fAllow64BitGuests, HC_ARCH_BITS == 64);
106 AssertLogRelRCReturn(rc, rc);
107#else
108 pVM->nem.s.fAllow64BitGuests = false;
109#endif
110
111 /** @cfgm{/NEM/LovelyMesaDrvWorkaround, bool, false}
112 * Workaround for mesa vmsvga 3d driver making incorrect assumptions about
113 * the hypervisor it is running under. */
114 bool f;
115 rc = CFGMR3QueryBoolDef(pCfgNem, "LovelyMesaDrvWorkaround", &f, false);
116 AssertLogRelRCReturn(rc, rc);
117 for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
118 {
119 PVMCPU pVCpu = pVM->apCpusR3[idCpu];
120 pVCpu->nem.s.fTrapXcptGpForLovelyMesaDrv = f;
121 }
122
123#ifdef RT_OS_WINDOWS
124 /** @cfgm{/NEM/UseRing0Runloop, bool, true}
125 * Whether to use the ring-0 runloop (if enabled in the build) or the ring-3 one.
126 * The latter is generally slower. This option serves as a way out in case
127 * something breaks in the ring-0 loop. */
128# ifdef NEM_WIN_USE_RING0_RUNLOOP_BY_DEFAULT
129 bool fUseRing0Runloop = true;
130# else
131 bool fUseRing0Runloop = false;
132# endif
133 rc = CFGMR3QueryBoolDef(pCfgNem, "UseRing0Runloop", &fUseRing0Runloop, fUseRing0Runloop);
134 AssertLogRelRCReturn(rc, rc);
135 pVM->nem.s.fUseRing0Runloop = fUseRing0Runloop;
136#endif
137
138 return VINF_SUCCESS;
139}
140
141
142/**
143 * This is called by HMR3Init() when HM cannot be used.
144 *
145 * Sets VM::bMainExecutionEngine to VM_EXEC_ENGINE_NATIVE_API if we can use a
146 * native hypervisor API to execute the VM.
147 *
148 * @returns VBox status code.
149 * @param pVM The cross context VM structure.
150 * @param fFallback Whether this is a fallback call. Cleared if the VM is
151 * configured to use NEM instead of HM.
152 * @param fForced Whether /HM/HMForced was set. If set and we fail to
153 * enable NEM, we'll return a failure status code.
154 * Otherwise we'll assume HMR3Init falls back on raw-mode.
155 */
156VMMR3_INT_DECL(int) NEMR3Init(PVM pVM, bool fFallback, bool fForced)
157{
158 Assert(pVM->bMainExecutionEngine != VM_EXEC_ENGINE_NATIVE_API);
159 int rc;
160 if (pVM->nem.s.fEnabled)
161 {
162#ifdef VBOX_WITH_NATIVE_NEM
163 rc = nemR3NativeInit(pVM, fFallback, fForced);
164 ASMCompilerBarrier(); /* May have changed bMainExecutionEngine. */
165#else
166 RT_NOREF(fFallback);
167 rc = VINF_SUCCESS;
168#endif
169 if (RT_SUCCESS(rc))
170 {
171 if (pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
172 LogRel(("NEM: NEMR3Init: Active.\n"));
173 else
174 {
175 LogRel(("NEM: NEMR3Init: Not available.\n"));
176 if (fForced)
177 rc = VERR_NEM_NOT_AVAILABLE;
178 }
179 }
180 else
181 LogRel(("NEM: NEMR3Init: Native init failed: %Rrc.\n", rc));
182 }
183 else
184 {
185 LogRel(("NEM: NEMR3Init: Disabled.\n"));
186 rc = fForced ? VERR_NEM_NOT_ENABLED : VINF_SUCCESS;
187 }
188 return rc;
189}
190
191
192/**
193 * Perform initialization that depends on CPUM working.
194 *
195 * This is a noop if NEM wasn't activated by a previous NEMR3Init() call.
196 *
197 * @returns VBox status code.
198 * @param pVM The cross context VM structure.
199 */
200VMMR3_INT_DECL(int) NEMR3InitAfterCPUM(PVM pVM)
201{
202 int rc = VINF_SUCCESS;
203 if (pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
204 {
205 /*
206 * Enable CPU features making general ASSUMPTIONS (there are two similar
207 * blocks of code in HM.cpp), to avoid duplicating this code. The
208 * native backend can make check capabilities and adjust as needed.
209 */
210 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_SEP);
211 if ( CPUMGetGuestCpuVendor(pVM) == CPUMCPUVENDOR_AMD
212 || CPUMGetGuestCpuVendor(pVM) == CPUMCPUVENDOR_HYGON)
213 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_SYSCALL); /* 64 bits only on Intel CPUs */
214 if (pVM->nem.s.fAllow64BitGuests)
215 {
216 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_SYSCALL);
217 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_PAE);
218 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_LONG_MODE);
219 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_LAHF);
220 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_NX);
221 }
222 /* Turn on NXE if PAE has been enabled. */
223 else if (CPUMR3GetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_PAE))
224 CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_NX);
225
226 /*
227 * Do native after-CPUM init.
228 */
229#ifdef VBOX_WITH_NATIVE_NEM
230 rc = nemR3NativeInitAfterCPUM(pVM);
231#else
232 RT_NOREF(pVM);
233#endif
234 }
235 return rc;
236}
237
238
239/**
240 * Called when a init phase has completed.
241 *
242 * @returns VBox status code.
243 * @param pVM The cross context VM structure.
244 * @param enmWhat The phase that completed.
245 */
246VMMR3_INT_DECL(int) NEMR3InitCompleted(PVM pVM, VMINITCOMPLETED enmWhat)
247{
248 /*
249 * Check if GIM needs #UD, since that applies to everyone.
250 */
251 if (enmWhat == VMINITCOMPLETED_RING3)
252 for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
253 {
254 PVMCPU pVCpu = pVM->apCpusR3[idCpu];
255 pVCpu->nem.s.fGIMTrapXcptUD = GIMShouldTrapXcptUD(pVCpu);
256 }
257
258 /*
259 * Call native code.
260 */
261 int rc = VINF_SUCCESS;
262#ifdef VBOX_WITH_NATIVE_NEM
263 if (pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
264 rc = nemR3NativeInitCompleted(pVM, enmWhat);
265#else
266 RT_NOREF(pVM, enmWhat);
267#endif
268 return rc;
269}
270
271
272/**
273 *
274 * @returns VBox status code.
275 * @param pVM The cross context VM structure.
276 */
277VMMR3_INT_DECL(int) NEMR3Term(PVM pVM)
278{
279 AssertReturn(pVM->nem.s.u32Magic == NEM_MAGIC, VERR_WRONG_ORDER);
280 for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
281 AssertReturn(pVM->apCpusR3[idCpu]->nem.s.u32Magic == NEMCPU_MAGIC, VERR_WRONG_ORDER);
282
283 /* Do native termination. */
284 int rc = VINF_SUCCESS;
285#ifdef VBOX_WITH_NATIVE_NEM
286 if (pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
287 rc = nemR3NativeTerm(pVM);
288#endif
289
290 /* Mark it as terminated. */
291 for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
292 {
293 PVMCPU pVCpu = pVM->apCpusR3[idCpu];
294 pVCpu->nem.s.u32Magic = NEMCPU_MAGIC_DEAD;
295 }
296 pVM->nem.s.u32Magic = NEM_MAGIC_DEAD;
297 return rc;
298}
299
300/**
301 * External interface for querying whether native execution API is used.
302 *
303 * @returns true if NEM is being used, otherwise false.
304 * @param pUVM The user mode VM handle.
305 * @sa HMR3IsEnabled
306 */
307VMMR3DECL(bool) NEMR3IsEnabled(PUVM pUVM)
308{
309 UVM_ASSERT_VALID_EXT_RETURN(pUVM, false);
310 PVM pVM = pUVM->pVM;
311 VM_ASSERT_VALID_EXT_RETURN(pVM, false);
312 return VM_IS_NEM_ENABLED(pVM);
313}
314
315
316/**
317 * The VM is being reset.
318 *
319 * @param pVM The cross context VM structure.
320 */
321VMMR3_INT_DECL(void) NEMR3Reset(PVM pVM)
322{
323#ifdef VBOX_WITH_NATIVE_NEM
324 if (pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
325 nemR3NativeReset(pVM);
326#else
327 RT_NOREF(pVM);
328#endif
329}
330
331
332/**
333 * Resets a virtual CPU.
334 *
335 * Used to bring up secondary CPUs on SMP as well as CPU hot plugging.
336 *
337 * @param pVCpu The cross context virtual CPU structure to reset.
338 * @param fInitIpi Set if being reset due to INIT IPI.
339 */
340VMMR3_INT_DECL(void) NEMR3ResetCpu(PVMCPU pVCpu, bool fInitIpi)
341{
342#ifdef VBOX_WITH_NATIVE_NEM
343 if (pVCpu->pVMR3->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API)
344 nemR3NativeResetCpu(pVCpu, fInitIpi);
345#else
346 RT_NOREF(pVCpu, fInitIpi);
347#endif
348}
349
350
351/**
352 * Indicates to TM that TMTSCMODE_NATIVE_API should be used for TSC.
353 *
354 * @returns true if TMTSCMODE_NATIVE_API must be used, otherwise @c false.
355 * @param pVM The cross context VM structure.
356 */
357VMMR3_INT_DECL(bool) NEMR3NeedSpecialTscMode(PVM pVM)
358{
359#ifdef VBOX_WITH_NATIVE_NEM
360# ifdef RT_OS_WINDOWS
361 if (VM_IS_NEM_ENABLED(pVM))
362 return true;
363# endif
364#else
365 RT_NOREF(pVM);
366#endif
367 return false;
368}
369
370
371/**
372 * Gets the name of a generic NEM exit code.
373 *
374 * @returns Pointer to read only string if @a uExit is known, otherwise NULL.
375 * @param uExit The NEM exit to name.
376 */
377VMMR3DECL(const char *) NEMR3GetExitName(uint32_t uExit)
378{
379 switch ((NEMEXITTYPE)uExit)
380 {
381 case NEMEXITTYPE_UNRECOVERABLE_EXCEPTION: return "NEM unrecoverable exception";
382 case NEMEXITTYPE_INVALID_VP_REGISTER_VALUE: return "NEM invalid vp register value";
383 case NEMEXITTYPE_INTTERRUPT_WINDOW: return "NEM interrupt window";
384 case NEMEXITTYPE_HALT: return "NEM halt";
385 case NEMEXITTYPE_XCPT_UD: return "NEM #UD";
386 case NEMEXITTYPE_XCPT_DB: return "NEM #DB";
387 case NEMEXITTYPE_XCPT_BP: return "NEM #BP";
388 case NEMEXITTYPE_CANCELED: return "NEM canceled";
389 case NEMEXITTYPE_MEMORY_ACCESS: return "NEM memory access";
390 }
391
392 return NULL;
393}
394
395
396VMMR3_INT_DECL(VBOXSTRICTRC) NEMR3RunGC(PVM pVM, PVMCPU pVCpu)
397{
398 Assert(VM_IS_NEM_ENABLED(pVM));
399#ifdef VBOX_WITH_NATIVE_NEM
400 return nemR3NativeRunGC(pVM, pVCpu);
401#else
402 NOREF(pVM); NOREF(pVCpu);
403 return VERR_INTERNAL_ERROR_3;
404#endif
405}
406
407
408#ifndef VBOX_WITH_NATIVE_NEM
409VMMR3_INT_DECL(bool) NEMR3CanExecuteGuest(PVM pVM, PVMCPU pVCpu)
410{
411 RT_NOREF(pVM, pVCpu);
412 return false;
413}
414#endif
415
416
417VMMR3_INT_DECL(bool) NEMR3SetSingleInstruction(PVM pVM, PVMCPU pVCpu, bool fEnable)
418{
419 Assert(VM_IS_NEM_ENABLED(pVM));
420#ifdef VBOX_WITH_NATIVE_NEM
421 return nemR3NativeSetSingleInstruction(pVM, pVCpu, fEnable);
422#else
423 NOREF(pVM); NOREF(pVCpu); NOREF(fEnable);
424 return false;
425#endif
426}
427
428
429VMMR3_INT_DECL(void) NEMR3NotifyFF(PVM pVM, PVMCPU pVCpu, uint32_t fFlags)
430{
431 AssertLogRelReturnVoid(VM_IS_NEM_ENABLED(pVM));
432#ifdef VBOX_WITH_NATIVE_NEM
433 nemR3NativeNotifyFF(pVM, pVCpu, fFlags);
434#else
435 RT_NOREF(pVM, pVCpu, fFlags);
436#endif
437}
438
439
440#ifndef VBOX_WITH_NATIVE_NEM
441VMMR3_INT_DECL(void) NEMR3NotifySetA20(PVMCPU pVCpu, bool fEnabled)
442{
443 RT_NOREF(pVCpu, fEnabled);
444}
445#endif
446
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