VMMGC.cpp@ 32048

Last change on this file since 32048 was 31402, checked in by vboxsync, 14 years ago
PGM: Replaced the hazzardous raw-mode context dynamic mapping code with the PGMR0DynMap code used by darwin/x86. This is a risky change but it should pay off once stable by providing 100% certainty that dynamically mapped pages aren't resued behind our back (this has been observed in seemingly benign code paths recently).
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File size: 10.4 KB

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1	/* $Id: VMMGC.cpp 31402 2010-08-05 12:28:18Z vboxsync $ */
2	/** @file
3	* VMM - Raw-mode Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VMM
23	#include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP */
24	#include <VBox/vmm.h>
25	#include <VBox/trpm.h>
26	#include <VBox/pgm.h>
27	#include "VMMInternal.h"
28	#include <VBox/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
51
52
53	/**
54	* The GC entry point.
55	*
56	* @returns VBox status code.
57	* @param pVM The VM to operate on.
58	* @param uOperation Which operation to execute (VMMGCOPERATION).
59	* @param uArg Argument to that operation.
60	*/
61	VMMRCDECL(int) VMMGCEntry(PVM pVM, unsigned uOperation, unsigned uArg, ...)
62	{
63	/* todo */
64	switch (uOperation)
65	{
66	/*
67	* Init RC modules.
68	*/
69	case VMMGC_DO_VMMGC_INIT:
70	{
71	/*
72	* Validate the svn revision (uArg).
73	*/
74	if (uArg != VMMGetSvnRev())
75	return VERR_VERSION_MISMATCH;
76
77	/*
78	* Initialize the runtime.
79	* (The program timestamp is found in the elipsis.)
80	*/
81	va_list va;
82	va_start(va, uArg);
83	uint64_t u64TS = va_arg(va, uint64_t);
84	va_end(va);
85
86	int rc = RTRCInit(u64TS);
87	Log(("VMMGCEntry: VMMGC_DO_VMMGC_INIT - uArg=%u (svn revision) u64TS=%RX64; rc=%Rrc\n", uArg, u64TS, rc));
88	AssertRCReturn(rc, rc);
89
90	rc = PGMRegisterStringFormatTypes();
91	AssertRCReturn(rc, rc);
92
93	rc = PGMRCDynMapInit(pVM);
94	AssertRCReturn(rc, rc);
95	return VINF_SUCCESS;
96	}
97
98	/*
99	* Testcase which is used to test interrupt forwarding.
100	* It spins for a while with interrupts enabled.
101	*/
102	case VMMGC_DO_TESTCASE_HYPER_INTERRUPT:
103	{
104	uint32_t volatile i = 0;
105	ASMIntEnable();
106	while (i < _2G32)
107	i++;
108	ASMIntDisable();
109	return 0;
110	}
111
112	/*
113	* Testcase which simply returns, this is used for
114	* profiling of the switcher.
115	*/
116	case VMMGC_DO_TESTCASE_NOP:
117	return 0;
118
119	/*
120	* Testcase executes a privileged instruction to force a world switch. (in both SVM & VMX)
121	*/
122	case VMMGC_DO_TESTCASE_HWACCM_NOP:
123	ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
124	return 0;
125
126	/*
127	* Delay for ~100us.
128	*/
129	case VMMGC_DO_TESTCASE_INTERRUPT_MASKING:
130	{
131	uint64_t u64MaxTicks = (SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage) != ~(uint64_t)0
132	? SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage)
133	: _2G)
134	/ 10000;
135	uint64_t u64StartTSC = ASMReadTSC();
136	uint64_t u64TicksNow;
137	uint32_t volatile i = 0;
138
139	do
140	{
141	/* waste some time and protect against getting stuck. */
142	for (uint32_t volatile j = 0; j < 1000; j++, i++)
143	if (i > _2G32)
144	return VERR_GENERAL_FAILURE;
145
146	/* check if we're done.*/
147	u64TicksNow = ASMReadTSC() - u64StartTSC;
148	} while (u64TicksNow < u64MaxTicks);
149
150	return VINF_SUCCESS;
151	}
152
153	/*
154	* Trap testcases and unknown operations.
155	*/
156	default:
157	if ( uOperation >= VMMGC_DO_TESTCASE_TRAP_FIRST
158	&& uOperation < VMMGC_DO_TESTCASE_TRAP_LAST)
159	return vmmGCTest(pVM, uOperation, uArg);
160	return VERR_INVALID_PARAMETER;
161	}
162	}
163
164
165	/**
166	* Internal RC logger worker: Flush logger.
167	*
168	* @returns VINF_SUCCESS.
169	* @param pLogger The logger instance to flush.
170	* @remark This function must be exported!
171	*/
172	VMMRCDECL(int) vmmGCLoggerFlush(PRTLOGGERRC pLogger)
173	{
174	PVM pVM = &g_VM;
175	NOREF(pLogger);
176	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
177	return VINF_SUCCESS; /* fail quietly. */
178	return VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
179	}
180
181
182	/**
183	* Flush logger if almost full.
184	*
185	* @param pVM The VM handle.
186	*/
187	VMMRCDECL(void) VMMGCLogFlushIfFull(PVM pVM)
188	{
189	if ( pVM->vmm.s.pRCLoggerRC
190	&& pVM->vmm.s.pRCLoggerRC->offScratch >= (sizeof(pVM->vmm.s.pRCLoggerRC->achScratch)*3/4))
191	{
192	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
193	return; /* fail quietly. */
194	VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
195	}
196	}
197
198
199	/**
200	* Switches from guest context to host context.
201	*
202	* @param pVM The VM handle.
203	* @param rc The status code.
204	*/
205	VMMRCDECL(void) VMMGCGuestToHost(PVM pVM, int rc)
206	{
207	pVM->vmm.s.pfnGuestToHostRC(rc);
208	}
209
210
211	/**
212	* Execute the trap testcase.
213	*
214	* There is some common code here, that's why we're collecting them
215	* like this. Odd numbered variation (uArg) are executed with write
216	* protection (WP) enabled.
217	*
218	* @returns VINF_SUCCESS if it was a testcase setup up to continue and did so successfully.
219	* @returns VERR_NOT_IMPLEMENTED if the testcase wasn't implemented.
220	* @returns VERR_GENERAL_FAILURE if the testcase continued when it shouldn't.
221	*
222	* @param pVM The VM handle.
223	* @param uOperation The testcase.
224	* @param uArg The variation. See function description for odd / even details.
225	*
226	* @remark Careful with the trap 08 testcase and WP, it will tripple
227	* fault the box if the TSS, the Trap8 TSS and the fault TSS
228	* GDTE are in pages which are read-only.
229	* See bottom of SELMR3Init().
230	*/
231	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg)
232	{
233	/*
234	* Set up the testcase.
235	*/
236	#if 0
237	switch (uOperation)
238	{
239	default:
240	break;
241	}
242	#endif
243
244	/*
245	* Enable WP if odd variation.
246	*/
247	if (uArg & 1)
248	vmmGCEnableWP();
249
250	/*
251	* Execute the testcase.
252	*/
253	int rc = VERR_NOT_IMPLEMENTED;
254	switch (uOperation)
255	{
256	//case VMMGC_DO_TESTCASE_TRAP_0:
257	//case VMMGC_DO_TESTCASE_TRAP_1:
258	//case VMMGC_DO_TESTCASE_TRAP_2:
259
260	case VMMGC_DO_TESTCASE_TRAP_3:
261	{
262	if (uArg <= 1)
263	rc = vmmGCTestTrap3();
264	break;
265	}
266
267	//case VMMGC_DO_TESTCASE_TRAP_4:
268	//case VMMGC_DO_TESTCASE_TRAP_5:
269	//case VMMGC_DO_TESTCASE_TRAP_6:
270	//case VMMGC_DO_TESTCASE_TRAP_7:
271
272	case VMMGC_DO_TESTCASE_TRAP_8:
273	{
274	#ifndef DEBUG_bird /** @todo dynamic check that this won't tripple fault... */
275	if (uArg & 1)
276	break;
277	#endif
278	if (uArg <= 1)
279	rc = vmmGCTestTrap8();
280	break;
281	}
282
283	//VMMGC_DO_TESTCASE_TRAP_9,
284	//VMMGC_DO_TESTCASE_TRAP_0A,
285	//VMMGC_DO_TESTCASE_TRAP_0B,
286	//VMMGC_DO_TESTCASE_TRAP_0C,
287
288	case VMMGC_DO_TESTCASE_TRAP_0D:
289	{
290	if (uArg <= 1)
291	rc = vmmGCTestTrap0d();
292	break;
293	}
294
295	case VMMGC_DO_TESTCASE_TRAP_0E:
296	{
297	if (uArg <= 1)
298	rc = vmmGCTestTrap0e();
299	else if (uArg == 2 \|\| uArg == 4)
300	{
301	/*
302	* Test the use of a temporary #PF handler.
303	*/
304	rc = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, uArg != 4 ? vmmGCTestTmpPFHandler : vmmGCTestTmpPFHandlerCorruptFS);
305	if (RT_SUCCESS(rc))
306	{
307	rc = vmmGCTestTrap0e();
308
309	/* in case it didn't fire. */
310	int rc2 = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, NULL);
311	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
312	rc = rc2;
313	}
314	}
315	break;
316	}
317	}
318
319	/*
320	* Re-enable WP.
321	*/
322	if (uArg & 1)
323	vmmGCDisableWP();
324
325	return rc;
326	}
327
328
329	/**
330	* Temporary \#PF trap handler for the \#PF test case.
331	*
332	* @returns VBox status code (appropriate for GC return).
333	* In this context RT_SUCCESS means to restart the instruction.
334	* @param pVM VM handle.
335	* @param pRegFrame Trap register frame.
336	*/
337	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
338	{
339	if (pRegFrame->eip == (uintptr_t)vmmGCTestTrap0e_FaultEIP)
340	{
341	pRegFrame->eip = (uintptr_t)vmmGCTestTrap0e_ResumeEIP;
342	return VINF_SUCCESS;
343	}
344	return VERR_INTERNAL_ERROR;
345	}
346
347
348	/**
349	* Temporary \#PF trap handler for the \#PF test case, this one messes up the fs
350	* selector.
351	*
352	* @returns VBox status code (appropriate for GC return).
353	* In this context RT_SUCCESS means to restart the instruction.
354	* @param pVM VM handle.
355	* @param pRegFrame Trap register frame.
356	*/
357	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame)
358	{
359	int rc = vmmGCTestTmpPFHandler(pVM, pRegFrame);
360	pRegFrame->fs = 0x30;
361	return rc;
362	}
363

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source: vbox/trunk/src/VBox/VMM/VMMGC/VMMGC.cpp@ 32048

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