VMMGC.cpp@ 26944

Last change on this file since 26944 was 25647, checked in by vboxsync, 15 years ago
Some more doxygen fixes, now for Core.docs.
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1	/* $Id: VMMGC.cpp 25647 2010-01-05 09:59:19Z vboxsync $ */
2	/** @file
3	* VMM - Raw-mode Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_VMM
27	#include <VBox/vmm.h>
28	#include <VBox/trpm.h>
29	#include <VBox/pgm.h>
30	#include "VMMInternal.h"
31	#include <VBox/vm.h>
32	#include <VBox/sup.h>
33	#include <VBox/err.h>
34	#include <VBox/log.h>
35	#include <iprt/asm.h>
36	#include <iprt/assert.h>
37	#include <iprt/initterm.h>
38
39
40	/*******************************************************************************
41	* Global Variables *
42	*******************************************************************************/
43	/** Default logger instance. */
44	extern "C" DECLIMPORT(RTLOGGERRC) g_Logger;
45	extern "C" DECLIMPORT(RTLOGGERRC) g_RelLogger;
46
47
48	/*******************************************************************************
49	* Internal Functions *
50	*******************************************************************************/
51	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg);
52	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
53	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame);
54
55
56
57	/**
58	* The GC entry point.
59	*
60	* @returns VBox status code.
61	* @param pVM The VM to operate on.
62	* @param uOperation Which operation to execute (VMMGCOPERATION).
63	* @param uArg Argument to that operation.
64	*/
65	VMMRCDECL(int) VMMGCEntry(PVM pVM, unsigned uOperation, unsigned uArg, ...)
66	{
67	/* todo */
68	switch (uOperation)
69	{
70	/*
71	* Init RC modules.
72	*/
73	case VMMGC_DO_VMMGC_INIT:
74	{
75	/*
76	* Validate the svn revision (uArg).
77	*/
78	if (uArg != VMMGetSvnRev())
79	return VERR_VERSION_MISMATCH;
80
81	/*
82	* Initialize the runtime.
83	* (The program timestamp is found in the elipsis.)
84	*/
85	va_list va;
86	va_start(va, uArg);
87	uint64_t u64TS = va_arg(va, uint64_t);
88	va_end(va);
89
90	int rc = RTRCInit(u64TS);
91	Log(("VMMGCEntry: VMMGC_DO_VMMGC_INIT - uArg=%u (svn revision) u64TS=%RX64; rc=%Rrc\n", uArg, u64TS, rc));
92	AssertRCReturn(rc, rc);
93
94	rc = PGMRegisterStringFormatTypes();
95	AssertRCReturn(rc, rc);
96
97	return VINF_SUCCESS;
98	}
99
100	/*
101	* Testcase which is used to test interrupt forwarding.
102	* It spins for a while with interrupts enabled.
103	*/
104	case VMMGC_DO_TESTCASE_HYPER_INTERRUPT:
105	{
106	uint32_t volatile i = 0;
107	ASMIntEnable();
108	while (i < _2G32)
109	i++;
110	ASMIntDisable();
111	return 0;
112	}
113
114	/*
115	* Testcase which simply returns, this is used for
116	* profiling of the switcher.
117	*/
118	case VMMGC_DO_TESTCASE_NOP:
119	return 0;
120
121	/*
122	* Testcase executes a privileged instruction to force a world switch. (in both SVM & VMX)
123	*/
124	case VMMGC_DO_TESTCASE_HWACCM_NOP:
125	ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
126	return 0;
127
128	/*
129	* Delay for ~100us.
130	*/
131	case VMMGC_DO_TESTCASE_INTERRUPT_MASKING:
132	{
133	uint64_t u64MaxTicks = (SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage) != ~(uint64_t)0
134	? SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage)
135	: _2G)
136	/ 10000;
137	uint64_t u64StartTSC = ASMReadTSC();
138	uint64_t u64TicksNow;
139	uint32_t volatile i = 0;
140
141	do
142	{
143	/* waste some time and protect against getting stuck. */
144	for (uint32_t volatile j = 0; j < 1000; j++, i++)
145	if (i > _2G32)
146	return VERR_GENERAL_FAILURE;
147
148	/* check if we're done.*/
149	u64TicksNow = ASMReadTSC() - u64StartTSC;
150	} while (u64TicksNow < u64MaxTicks);
151
152	return VINF_SUCCESS;
153	}
154
155	/*
156	* Trap testcases and unknown operations.
157	*/
158	default:
159	if ( uOperation >= VMMGC_DO_TESTCASE_TRAP_FIRST
160	&& uOperation < VMMGC_DO_TESTCASE_TRAP_LAST)
161	return vmmGCTest(pVM, uOperation, uArg);
162	return VERR_INVALID_PARAMETER;
163	}
164	}
165
166
167	/**
168	* Internal RC logger worker: Flush logger.
169	*
170	* @returns VINF_SUCCESS.
171	* @param pLogger The logger instance to flush.
172	* @remark This function must be exported!
173	*/
174	VMMRCDECL(int) vmmGCLoggerFlush(PRTLOGGERRC pLogger)
175	{
176	PVM pVM = &g_VM;
177	NOREF(pLogger);
178	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
179	return VINF_SUCCESS; /* fail quietly. */
180	return VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
181	}
182
183
184	/**
185	* Flush logger if almost full.
186	*
187	* @param pVM The VM handle.
188	*/
189	VMMRCDECL(void) VMMGCLogFlushIfFull(PVM pVM)
190	{
191	if ( pVM->vmm.s.pRCLoggerRC
192	&& pVM->vmm.s.pRCLoggerRC->offScratch >= (sizeof(pVM->vmm.s.pRCLoggerRC->achScratch)*3/4))
193	{
194	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
195	return; /* fail quietly. */
196	VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
197	}
198	}
199
200
201	/**
202	* Switches from guest context to host context.
203	*
204	* @param pVM The VM handle.
205	* @param rc The status code.
206	*/
207	VMMRCDECL(void) VMMGCGuestToHost(PVM pVM, int rc)
208	{
209	pVM->vmm.s.pfnGuestToHostRC(rc);
210	}
211
212
213	/**
214	* Execute the trap testcase.
215	*
216	* There is some common code here, that's why we're collecting them
217	* like this. Odd numbered variation (uArg) are executed with write
218	* protection (WP) enabled.
219	*
220	* @returns VINF_SUCCESS if it was a testcase setup up to continue and did so successfully.
221	* @returns VERR_NOT_IMPLEMENTED if the testcase wasn't implemented.
222	* @returns VERR_GENERAL_FAILURE if the testcase continued when it shouldn't.
223	*
224	* @param pVM The VM handle.
225	* @param uOperation The testcase.
226	* @param uArg The variation. See function description for odd / even details.
227	*
228	* @remark Careful with the trap 08 testcase and WP, it will tripple
229	* fault the box if the TSS, the Trap8 TSS and the fault TSS
230	* GDTE are in pages which are read-only.
231	* See bottom of SELMR3Init().
232	*/
233	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg)
234	{
235	/*
236	* Set up the testcase.
237	*/
238	#if 0
239	switch (uOperation)
240	{
241	default:
242	break;
243	}
244	#endif
245
246	/*
247	* Enable WP if odd variation.
248	*/
249	if (uArg & 1)
250	vmmGCEnableWP();
251
252	/*
253	* Execute the testcase.
254	*/
255	int rc = VERR_NOT_IMPLEMENTED;
256	switch (uOperation)
257	{
258	//case VMMGC_DO_TESTCASE_TRAP_0:
259	//case VMMGC_DO_TESTCASE_TRAP_1:
260	//case VMMGC_DO_TESTCASE_TRAP_2:
261
262	case VMMGC_DO_TESTCASE_TRAP_3:
263	{
264	if (uArg <= 1)
265	rc = vmmGCTestTrap3();
266	break;
267	}
268
269	//case VMMGC_DO_TESTCASE_TRAP_4:
270	//case VMMGC_DO_TESTCASE_TRAP_5:
271	//case VMMGC_DO_TESTCASE_TRAP_6:
272	//case VMMGC_DO_TESTCASE_TRAP_7:
273
274	case VMMGC_DO_TESTCASE_TRAP_8:
275	{
276	#ifndef DEBUG_bird /** @todo dynamic check that this won't tripple fault... */
277	if (uArg & 1)
278	break;
279	#endif
280	if (uArg <= 1)
281	rc = vmmGCTestTrap8();
282	break;
283	}
284
285	//VMMGC_DO_TESTCASE_TRAP_9,
286	//VMMGC_DO_TESTCASE_TRAP_0A,
287	//VMMGC_DO_TESTCASE_TRAP_0B,
288	//VMMGC_DO_TESTCASE_TRAP_0C,
289
290	case VMMGC_DO_TESTCASE_TRAP_0D:
291	{
292	if (uArg <= 1)
293	rc = vmmGCTestTrap0d();
294	break;
295	}
296
297	case VMMGC_DO_TESTCASE_TRAP_0E:
298	{
299	if (uArg <= 1)
300	rc = vmmGCTestTrap0e();
301	else if (uArg == 2 \|\| uArg == 4)
302	{
303	/*
304	* Test the use of a temporary #PF handler.
305	*/
306	rc = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, uArg != 4 ? vmmGCTestTmpPFHandler : vmmGCTestTmpPFHandlerCorruptFS);
307	if (RT_SUCCESS(rc))
308	{
309	rc = vmmGCTestTrap0e();
310
311	/* in case it didn't fire. */
312	int rc2 = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, NULL);
313	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
314	rc = rc2;
315	}
316	}
317	break;
318	}
319	}
320
321	/*
322	* Re-enable WP.
323	*/
324	if (uArg & 1)
325	vmmGCDisableWP();
326
327	return rc;
328	}
329
330
331	/**
332	* Temporary \#PF trap handler for the \#PF test case.
333	*
334	* @returns VBox status code (appropriate for GC return).
335	* In this context RT_SUCCESS means to restart the instruction.
336	* @param pVM VM handle.
337	* @param pRegFrame Trap register frame.
338	*/
339	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
340	{
341	if (pRegFrame->eip == (uintptr_t)vmmGCTestTrap0e_FaultEIP)
342	{
343	pRegFrame->eip = (uintptr_t)vmmGCTestTrap0e_ResumeEIP;
344	return VINF_SUCCESS;
345	}
346	return VERR_INTERNAL_ERROR;
347	}
348
349
350	/**
351	* Temporary \#PF trap handler for the \#PF test case, this one messes up the fs
352	* selector.
353	*
354	* @returns VBox status code (appropriate for GC return).
355	* In this context RT_SUCCESS means to restart the instruction.
356	* @param pVM VM handle.
357	* @param pRegFrame Trap register frame.
358	*/
359	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame)
360	{
361	int rc = vmmGCTestTmpPFHandler(pVM, pRegFrame);
362	pRegFrame->fs = 0x30;
363	return rc;
364	}
365

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source: vbox/trunk/src/VBox/VMM/VMMGC/VMMGC.cpp@ 26944

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