VMMRC.cpp@ 55705

Last change on this file since 55705 was 54308, checked in by vboxsync, 10 years ago
VMM,SUP: Apply the tsc delta where it matters. Made sense out of the paravirt-tsc-mode enable/disable code.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 13.3 KB

Line
1	/* $Id: VMMRC.cpp 54308 2015-02-19 19:43:51Z vboxsync $ */
2	/** @file
3	* VMM - Raw-mode Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VMM
23	#include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP */
24	#include <VBox/vmm/vmm.h>
25	#include <VBox/vmm/trpm.h>
26	#include <VBox/vmm/pgm.h>
27	#include "VMMInternal.h"
28	#include <VBox/vmm/vm.h>
29	#include <VBox/sup.h>
30	#include <VBox/err.h>
31	#include <VBox/log.h>
32	#include <iprt/assert.h>
33	#include <iprt/initterm.h>
34
35
36	/*******************************************************************************
37	* Global Variables *
38	*******************************************************************************/
39	/** Default logger instance. */
40	extern "C" DECLIMPORT(RTLOGGERRC) g_Logger;
41	extern "C" DECLIMPORT(RTLOGGERRC) g_RelLogger;
42
43
44	/*******************************************************************************
45	* Internal Functions *
46	*******************************************************************************/
47	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg);
48	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
49	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame);
50	DECLASM(bool) vmmRCSafeMsrRead(uint32_t uMsr, uint64_t *pu64Value);
51	DECLASM(bool) vmmRCSafeMsrWrite(uint32_t uMsr, uint64_t u64Value);
52
53
54
55	/**
56	* The GC entry point.
57	*
58	* @returns VBox status code.
59	* @param pVM Pointer to the VM.
60	* @param uOperation Which operation to execute (VMMGCOPERATION).
61	* @param uArg Argument to that operation.
62	*/
63	VMMRCDECL(int) VMMGCEntry(PVM pVM, unsigned uOperation, unsigned uArg, ...)
64	{
65	/* todo */
66	switch (uOperation)
67	{
68	/*
69	* Init RC modules.
70	*/
71	case VMMGC_DO_VMMGC_INIT:
72	{
73	/*
74	* Validate the svn revision (uArg) and build type (ellipsis).
75	*/
76	if (uArg != VMMGetSvnRev())
77	return VERR_VMM_RC_VERSION_MISMATCH;
78
79	va_list va;
80	va_start(va, uArg);
81
82	uint32_t uBuildType = va_arg(va, uint32_t);
83	if (uBuildType != vmmGetBuildType())
84	return VERR_VMM_RC_VERSION_MISMATCH;
85
86	/*
87	* Initialize the runtime.
88	*/
89	uint64_t u64TS = va_arg(va, uint64_t);
90
91	va_end(va);
92
93	int rc = RTRCInit(u64TS);
94	Log(("VMMGCEntry: VMMGC_DO_VMMGC_INIT - uArg=%u (svn revision) u64TS=%RX64; rc=%Rrc\n", uArg, u64TS, rc));
95	AssertRCReturn(rc, rc);
96
97	rc = PGMRegisterStringFormatTypes();
98	AssertRCReturn(rc, rc);
99
100	rc = PGMRCDynMapInit(pVM);
101	AssertRCReturn(rc, rc);
102	return VINF_SUCCESS;
103	}
104
105	/*
106	* Testcase which is used to test interrupt forwarding.
107	* It spins for a while with interrupts enabled.
108	*/
109	case VMMGC_DO_TESTCASE_HYPER_INTERRUPT:
110	{
111	uint32_t volatile i = 0;
112	ASMIntEnable();
113	while (i < _2G32)
114	i++;
115	ASMIntDisable();
116	return 0;
117	}
118
119	/*
120	* Testcase which simply returns, this is used for
121	* profiling of the switcher.
122	*/
123	case VMMGC_DO_TESTCASE_NOP:
124	return 0;
125
126	/*
127	* Testcase executes a privileged instruction to force a world switch. (in both SVM & VMX)
128	*/
129	case VMMGC_DO_TESTCASE_HM_NOP:
130	ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
131	return 0;
132
133	/*
134	* Delay for ~100us.
135	*/
136	case VMMGC_DO_TESTCASE_INTERRUPT_MASKING:
137	{
138	uint64_t u64MaxTicks = (SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage) != ~(uint64_t)0
139	? SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage)
140	: _2G)
141	/ 10000;
142	uint64_t u64StartTSC = ASMReadTSC();
143	uint64_t u64TicksNow;
144	uint32_t volatile i = 0;
145
146	do
147	{
148	/* waste some time and protect against getting stuck. */
149	for (uint32_t volatile j = 0; j < 1000; j++, i++)
150	if (i > _2G32)
151	return VERR_GENERAL_FAILURE;
152
153	/* check if we're done.*/
154	u64TicksNow = ASMReadTSC() - u64StartTSC;
155	} while (u64TicksNow < u64MaxTicks);
156
157	return VINF_SUCCESS;
158	}
159
160	/*
161	* Trap testcases and unknown operations.
162	*/
163	default:
164	if ( uOperation >= VMMGC_DO_TESTCASE_TRAP_FIRST
165	&& uOperation < VMMGC_DO_TESTCASE_TRAP_LAST)
166	return vmmGCTest(pVM, uOperation, uArg);
167	return VERR_INVALID_PARAMETER;
168	}
169	}
170
171
172	/**
173	* Internal RC logger worker: Flush logger.
174	*
175	* @returns VINF_SUCCESS.
176	* @param pLogger The logger instance to flush.
177	* @remark This function must be exported!
178	*/
179	VMMRCDECL(int) vmmGCLoggerFlush(PRTLOGGERRC pLogger)
180	{
181	PVM pVM = &g_VM;
182	NOREF(pLogger);
183	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
184	return VINF_SUCCESS; /* fail quietly. */
185	return VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
186	}
187
188
189	/**
190	* Flush logger if almost full.
191	*
192	* @param pVM Pointer to the VM.
193	*/
194	VMMRCDECL(void) VMMGCLogFlushIfFull(PVM pVM)
195	{
196	if ( pVM->vmm.s.pRCLoggerRC
197	&& pVM->vmm.s.pRCLoggerRC->offScratch >= (sizeof(pVM->vmm.s.pRCLoggerRC->achScratch)*3/4))
198	{
199	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
200	return; /* fail quietly. */
201	VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
202	}
203	}
204
205
206	/**
207	* Switches from guest context to host context.
208	*
209	* @param pVM Pointer to the VM.
210	* @param rc The status code.
211	*/
212	VMMRCDECL(void) VMMGCGuestToHost(PVM pVM, int rc)
213	{
214	pVM->vmm.s.pfnRCToHost(rc);
215	}
216
217
218	/**
219	* Calls the ring-0 host code.
220	*
221	* @param pVM Pointer to the VM.
222	*/
223	DECLASM(void) vmmRCProbeFireHelper(PVM pVM)
224	{
225	pVM->vmm.s.pfnRCToHost(VINF_VMM_CALL_TRACER);
226	}
227
228
229
230	/**
231	* Execute the trap testcase.
232	*
233	* There is some common code here, that's why we're collecting them
234	* like this. Odd numbered variation (uArg) are executed with write
235	* protection (WP) enabled.
236	*
237	* @returns VINF_SUCCESS if it was a testcase setup up to continue and did so successfully.
238	* @returns VERR_NOT_IMPLEMENTED if the testcase wasn't implemented.
239	* @returns VERR_GENERAL_FAILURE if the testcase continued when it shouldn't.
240	*
241	* @param pVM Pointer to the VM.
242	* @param uOperation The testcase.
243	* @param uArg The variation. See function description for odd / even details.
244	*
245	* @remark Careful with the trap 08 testcase and WP, it will triple
246	* fault the box if the TSS, the Trap8 TSS and the fault TSS
247	* GDTE are in pages which are read-only.
248	* See bottom of SELMR3Init().
249	*/
250	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg)
251	{
252	/*
253	* Set up the testcase.
254	*/
255	#if 0
256	switch (uOperation)
257	{
258	default:
259	break;
260	}
261	#endif
262
263	/*
264	* Enable WP if odd variation.
265	*/
266	if (uArg & 1)
267	vmmGCEnableWP();
268
269	/*
270	* Execute the testcase.
271	*/
272	int rc = VERR_NOT_IMPLEMENTED;
273	switch (uOperation)
274	{
275	//case VMMGC_DO_TESTCASE_TRAP_0:
276	//case VMMGC_DO_TESTCASE_TRAP_1:
277	//case VMMGC_DO_TESTCASE_TRAP_2:
278
279	case VMMGC_DO_TESTCASE_TRAP_3:
280	{
281	if (uArg <= 1)
282	rc = vmmGCTestTrap3();
283	break;
284	}
285
286	//case VMMGC_DO_TESTCASE_TRAP_4:
287	//case VMMGC_DO_TESTCASE_TRAP_5:
288	//case VMMGC_DO_TESTCASE_TRAP_6:
289	//case VMMGC_DO_TESTCASE_TRAP_7:
290
291	case VMMGC_DO_TESTCASE_TRAP_8:
292	{
293	#ifndef DEBUG_bird /** @todo dynamic check that this won't triple fault... */
294	if (uArg & 1)
295	break;
296	#endif
297	if (uArg <= 1)
298	rc = vmmGCTestTrap8();
299	break;
300	}
301
302	//VMMGC_DO_TESTCASE_TRAP_9,
303	//VMMGC_DO_TESTCASE_TRAP_0A,
304	//VMMGC_DO_TESTCASE_TRAP_0B,
305	//VMMGC_DO_TESTCASE_TRAP_0C,
306
307	case VMMGC_DO_TESTCASE_TRAP_0D:
308	{
309	if (uArg <= 1)
310	rc = vmmGCTestTrap0d();
311	break;
312	}
313
314	case VMMGC_DO_TESTCASE_TRAP_0E:
315	{
316	if (uArg <= 1)
317	rc = vmmGCTestTrap0e();
318	else if (uArg == 2 \|\| uArg == 4)
319	{
320	/*
321	* Test the use of a temporary #PF handler.
322	*/
323	rc = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, uArg != 4 ? vmmGCTestTmpPFHandler : vmmGCTestTmpPFHandlerCorruptFS);
324	if (RT_SUCCESS(rc))
325	{
326	rc = vmmGCTestTrap0e();
327
328	/* in case it didn't fire. */
329	int rc2 = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, NULL);
330	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
331	rc = rc2;
332	}
333	}
334	break;
335	}
336	}
337
338	/*
339	* Re-enable WP.
340	*/
341	if (uArg & 1)
342	vmmGCDisableWP();
343
344	return rc;
345	}
346
347
348
349	/**
350	* Reads a range of MSRs.
351	*
352	* This is called directly via VMMR3CallRC.
353	*
354	* @returns VBox status code.
355	* @param pVM The VM handle.
356	* @param uMsr The MSR to start at.
357	* @param cMsrs The number of MSRs to read.
358	* @param paResults Where to store the results. This must be large
359	* enough to hold at least @a cMsrs result values.
360	*/
361	extern "C" VMMRCDECL(int)
362	VMMRCTestReadMsrs(PVM pVM, uint32_t uMsr, uint32_t cMsrs, PVMMTESTMSRENTRY paResults)
363	{
364	AssertReturn(cMsrs <= 16384, VERR_INVALID_PARAMETER);
365	AssertPtrReturn(paResults, VERR_INVALID_POINTER);
366	ASMIntEnable(); /* Run with interrupts enabled, so we can query more MSRs in one block. */
367
368	for (uint32_t i = 0; i < cMsrs; i++, uMsr++)
369	{
370	if (vmmRCSafeMsrRead(uMsr, &paResults[i].uValue))
371	paResults[i].uMsr = uMsr;
372	else
373	paResults[i].uMsr = UINT64_MAX;
374	}
375
376	ASMIntDisable();
377	return VINF_SUCCESS;
378	}
379
380
381	/**
382	* Tries to write the given value to an MSR, returns the effect and restors the
383	* original value.
384	*
385	* This is called directly via VMMR3CallRC.
386	*
387	* @returns VBox status code.
388	* @param pVM The VM handle.
389	* @param uMsr The MSR to start at.
390	* @param u32ValueLow The low part of the value to write.
391	* @param u32ValueHi The high part of the value to write.
392	* @param puValueBefore The value before writing.
393	* @param puValueAfter The value read back after writing.
394	*/
395	extern "C" VMMRCDECL(int)
396	VMMRCTestTestWriteMsr(PVM pVM, uint32_t uMsr, uint32_t u32ValueLow, uint32_t u32ValueHi,
397	uint64_t puValueBefore, uint64_t puValueAfter)
398	{
399	AssertPtrReturn(puValueBefore, VERR_INVALID_POINTER);
400	AssertPtrReturn(puValueAfter, VERR_INVALID_POINTER);
401	ASMIntDisable();
402
403	int rc = VINF_SUCCESS;
404	uint64_t uValueBefore = UINT64_MAX;
405	uint64_t uValueAfter = UINT64_MAX;
406	if (vmmRCSafeMsrRead(uMsr, &uValueBefore))
407	{
408	if (!vmmRCSafeMsrWrite(uMsr, RT_MAKE_U64(u32ValueLow, u32ValueHi)))
409	rc = VERR_WRITE_PROTECT;
410	if (!vmmRCSafeMsrRead(uMsr, &uValueAfter) && RT_SUCCESS(rc))
411	rc = VERR_READ_ERROR;
412	vmmRCSafeMsrWrite(uMsr, uValueBefore);
413	}
414	else
415	rc = VERR_ACCESS_DENIED;
416
417	*puValueBefore = uValueBefore;
418	*puValueAfter = uValueAfter;
419	return rc;
420	}
421
422
423
424	/**
425	* Temporary \#PF trap handler for the \#PF test case.
426	*
427	* @returns VBox status code (appropriate for GC return).
428	* In this context RT_SUCCESS means to restart the instruction.
429	* @param pVM Pointer to the VM.
430	* @param pRegFrame Trap register frame.
431	*/
432	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
433	{
434	if (pRegFrame->eip == (uintptr_t)vmmGCTestTrap0e_FaultEIP)
435	{
436	pRegFrame->eip = (uintptr_t)vmmGCTestTrap0e_ResumeEIP;
437	return VINF_SUCCESS;
438	}
439	NOREF(pVM);
440	return VERR_INTERNAL_ERROR;
441	}
442
443
444	/**
445	* Temporary \#PF trap handler for the \#PF test case, this one messes up the fs
446	* selector.
447	*
448	* @returns VBox status code (appropriate for GC return).
449	* In this context RT_SUCCESS means to restart the instruction.
450	* @param pVM Pointer to the VM.
451	* @param pRegFrame Trap register frame.
452	*/
453	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame)
454	{
455	int rc = vmmGCTestTmpPFHandler(pVM, pRegFrame);
456	pRegFrame->fs.Sel = 0x30;
457	return rc;
458	}
459

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source: vbox/trunk/src/VBox/VMM/VMMRC/VMMRC.cpp@ 55705

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