TRPM.cpp@ 8676

Last change on this file since 8676 was 8155, checked in by vboxsync, 17 years ago
The Big Sun Rebranding Header Change
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 71.0 KB

Line
1	/* $Id: TRPM.cpp 8155 2008-04-18 15:16:47Z vboxsync $ */
2	/** @file
3	* TRPM - The Trap Monitor
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	/** @page pg_trpm TRPM - The Trap Monitor
24	*
25	* The Trap Monitor (TRPM) is responsible for all trap and interrupt
26	* handling in the VMM.
27	*
28	* Interrupts occuring in GC will be routed to the HC and reassert there. TRPM
29	* makes the assumption that the VMM or Guest will not cause hardware
30	* interrupts to occur.
31	*
32	* Traps will be passed to a list of registered trap handlers which will
33	* check and see if they are the responsible part for the trap. If no handler
34	* was found the default action is to pass the trap on the Guest OS. Trap
35	* handlers may raise a Guest OS trap as a result of the trap handling.
36	* Statistics will be maintained so the trap handler list can be resorted
37	* every now and then to examin handlers in the optimal order.
38	*
39	* If a trap happens inside the VMM (Guest Context) the TRPM will take the
40	* shortest path back to Ring-3 Host Context and brutally destroy the VM.
41	*
42	* The TRPM will have interfaces to enable devices to assert interrupts
43	* in the guest, these interfaces are multithreaded and availble from
44	* all contexts. This is to allow devices to have use worker threads.
45	*
46	*/
47
48
49
50	/*******************************************************************************
51	* Header Files *
52	*******************************************************************************/
53	#define LOG_GROUP LOG_GROUP_TRPM
54	#include <VBox/trpm.h>
55	#include <VBox/cpum.h>
56	#include <VBox/selm.h>
57	#include <VBox/ssm.h>
58	#include <VBox/pdmapi.h>
59	#include <VBox/pgm.h>
60	#include <VBox/dbgf.h>
61	#include <VBox/mm.h>
62	#include <VBox/stam.h>
63	#include <VBox/csam.h>
64	#include <VBox/patm.h>
65	#include "TRPMInternal.h"
66	#include <VBox/vm.h>
67	#include <VBox/em.h>
68	#include <VBox/rem.h>
69	#include <VBox/hwaccm.h>
70
71	#include <VBox/err.h>
72	#include <VBox/param.h>
73	#include <VBox/log.h>
74	#include <iprt/assert.h>
75	#include <iprt/asm.h>
76	#include <iprt/string.h>
77	#include <iprt/alloc.h>
78
79
80	/*******************************************************************************
81	* Structures and Typedefs *
82	*******************************************************************************/
83	/**
84	* Trap handler function.
85	* @todo need to specialize this as we go along.
86	*/
87	typedef enum TRPMHANDLER
88	{
89	/** Generic Interrupt handler. */
90	TRPM_HANDLER_INT = 0,
91	/** Generic Trap handler. */
92	TRPM_HANDLER_TRAP,
93	/** Trap 8 (\#DF) handler. */
94	TRPM_HANDLER_TRAP_08,
95	/** Trap 12 (\#MC) handler. */
96	TRPM_HANDLER_TRAP_12,
97	/** Max. */
98	TRPM_HANDLER_MAX
99	} TRPMHANDLER, *PTRPMHANDLER;
100
101
102	/*******************************************************************************
103	* Global Variables *
104	*******************************************************************************/
105	/** Preinitialized IDT.
106	* The u16OffsetLow is a value of the TRPMHANDLER enum which TRPMR3Relocate()
107	* will use to pick the right address. The u16SegSel is always VMM CS.
108	*/
109	static VBOXIDTE_GENERIC g_aIdt[256] =
110	{
111	/* special trap handler - still, this is an interrupt gate not a trap gate... */
112	#define IDTE_TRAP(enm) { (unsigned)enm, 0, 0, VBOX_IDTE_TYPE1, VBOX_IDTE_TYPE2_INT_32, 0, 1, 0 }
113	/* generic trap handler. */
114	#define IDTE_TRAP_GEN() IDTE_TRAP(TRPM_HANDLER_TRAP)
115	/* special interrupt handler. */
116	#define IDTE_INT(enm) { (unsigned)enm, 0, 0, VBOX_IDTE_TYPE1, VBOX_IDTE_TYPE2_INT_32, 0, 1, 0 }
117	/* generic interrupt handler. */
118	#define IDTE_INT_GEN() IDTE_INT(TRPM_HANDLER_INT)
119	/* special task gate IDT entry (for critical exceptions like #DF). */
120	#define IDTE_TASK(enm) { (unsigned)enm, 0, 0, VBOX_IDTE_TYPE1, VBOX_IDTE_TYPE2_TASK, 0, 1, 0 }
121	/* draft, fixme later when the handler is written. */
122	#define IDTE_RESERVED() { 0, 0, 0, 0, 0, 0, 0, 0 }
123
124	/* N - M M - T - C - D i */
125	/* o - n o - y - o - e p */
126	/* - e n - p - d - s t */
127	/* - i - e - e - c . */
128	/* - c - - - r */
129	/* ============================================================= */
130	IDTE_TRAP_GEN(), /* 0 - #DE - F - N - Divide error */
131	IDTE_TRAP_GEN(), /* 1 - #DB - F/T - N - Single step, INT 1 instruction */
132	#ifdef VBOX_WITH_NMI
133	IDTE_TRAP_GEN(), /* 2 - - I - N - Non-Maskable Interrupt (NMI) */
134	#else
135	IDTE_INT_GEN(), /* 2 - - I - N - Non-Maskable Interrupt (NMI) */
136	#endif
137	IDTE_TRAP_GEN(), /* 3 - #BP - T - N - Breakpoint, INT 3 instruction. */
138	IDTE_TRAP_GEN(), /* 4 - #OF - T - N - Overflow, INTO instruction. */
139	IDTE_TRAP_GEN(), /* 5 - #BR - F - N - BOUND Range Exceeded, BOUND instruction. */
140	IDTE_TRAP_GEN(), /* 6 - #UD - F - N - Undefined(/Invalid) Opcode. */
141	IDTE_TRAP_GEN(), /* 7 - #NM - F - N - Device not available, FP or (F)WAIT instruction. */
142	IDTE_TASK(TRPM_HANDLER_TRAP_08), /* 8 - #DF - A - 0 - Double fault. */
143	IDTE_TRAP_GEN(), /* 9 - - F - N - Coprocessor Segment Overrun (obsolete). */
144	IDTE_TRAP_GEN(), /* a - #TS - F - Y - Invalid TSS, Taskswitch or TSS access. */
145	IDTE_TRAP_GEN(), /* b - #NP - F - Y - Segment not present. */
146	IDTE_TRAP_GEN(), /* c - #SS - F - Y - Stack-Segment fault. */
147	IDTE_TRAP_GEN(), /* d - #GP - F - Y - General protection fault. */
148	IDTE_TRAP_GEN(), /* e - #PF - F - Y - Page fault. - interrupt gate!!! */
149	IDTE_RESERVED(), /* f - - - - Intel Reserved. Do not use. */
150	IDTE_TRAP_GEN(), /* 10 - #MF - F - N - x86 FPU Floating-Point Error (Math fault), FP or (F)WAIT instruction. */
151	IDTE_TRAP_GEN(), /* 11 - #AC - F - 0 - Alignment Check. */
152	IDTE_TRAP(TRPM_HANDLER_TRAP_12), /* 12 - #MC - A - N - Machine Check. */
153	IDTE_TRAP_GEN(), /* 13 - #XF - F - N - SIMD Floating-Point Exception. */
154	IDTE_RESERVED(), /* 14 - - - - Intel Reserved. Do not use. */
155	IDTE_RESERVED(), /* 15 - - - - Intel Reserved. Do not use. */
156	IDTE_RESERVED(), /* 16 - - - - Intel Reserved. Do not use. */
157	IDTE_RESERVED(), /* 17 - - - - Intel Reserved. Do not use. */
158	IDTE_RESERVED(), /* 18 - - - - Intel Reserved. Do not use. */
159	IDTE_RESERVED(), /* 19 - - - - Intel Reserved. Do not use. */
160	IDTE_RESERVED(), /* 1a - - - - Intel Reserved. Do not use. */
161	IDTE_RESERVED(), /* 1b - - - - Intel Reserved. Do not use. */
162	IDTE_RESERVED(), /* 1c - - - - Intel Reserved. Do not use. */
163	IDTE_RESERVED(), /* 1d - - - - Intel Reserved. Do not use. */
164	IDTE_RESERVED(), /* 1e - - - - Intel Reserved. Do not use. */
165	IDTE_RESERVED(), /* 1f - - - - Intel Reserved. Do not use. */
166	IDTE_INT_GEN(), /* 20 - - I - - User defined Interrupts, external of INT n. */
167	IDTE_INT_GEN(), /* 21 - - I - - User defined Interrupts, external of INT n. */
168	IDTE_INT_GEN(), /* 22 - - I - - User defined Interrupts, external of INT n. */
169	IDTE_INT_GEN(), /* 23 - - I - - User defined Interrupts, external of INT n. */
170	IDTE_INT_GEN(), /* 24 - - I - - User defined Interrupts, external of INT n. */
171	IDTE_INT_GEN(), /* 25 - - I - - User defined Interrupts, external of INT n. */
172	IDTE_INT_GEN(), /* 26 - - I - - User defined Interrupts, external of INT n. */
173	IDTE_INT_GEN(), /* 27 - - I - - User defined Interrupts, external of INT n. */
174	IDTE_INT_GEN(), /* 28 - - I - - User defined Interrupts, external of INT n. */
175	IDTE_INT_GEN(), /* 29 - - I - - User defined Interrupts, external of INT n. */
176	IDTE_INT_GEN(), /* 2a - - I - - User defined Interrupts, external of INT n. */
177	IDTE_INT_GEN(), /* 2b - - I - - User defined Interrupts, external of INT n. */
178	IDTE_INT_GEN(), /* 2c - - I - - User defined Interrupts, external of INT n. */
179	IDTE_INT_GEN(), /* 2d - - I - - User defined Interrupts, external of INT n. */
180	IDTE_INT_GEN(), /* 2e - - I - - User defined Interrupts, external of INT n. */
181	IDTE_INT_GEN(), /* 2f - - I - - User defined Interrupts, external of INT n. */
182	IDTE_INT_GEN(), /* 30 - - I - - User defined Interrupts, external of INT n. */
183	IDTE_INT_GEN(), /* 31 - - I - - User defined Interrupts, external of INT n. */
184	IDTE_INT_GEN(), /* 32 - - I - - User defined Interrupts, external of INT n. */
185	IDTE_INT_GEN(), /* 33 - - I - - User defined Interrupts, external of INT n. */
186	IDTE_INT_GEN(), /* 34 - - I - - User defined Interrupts, external of INT n. */
187	IDTE_INT_GEN(), /* 35 - - I - - User defined Interrupts, external of INT n. */
188	IDTE_INT_GEN(), /* 36 - - I - - User defined Interrupts, external of INT n. */
189	IDTE_INT_GEN(), /* 37 - - I - - User defined Interrupts, external of INT n. */
190	IDTE_INT_GEN(), /* 38 - - I - - User defined Interrupts, external of INT n. */
191	IDTE_INT_GEN(), /* 39 - - I - - User defined Interrupts, external of INT n. */
192	IDTE_INT_GEN(), /* 3a - - I - - User defined Interrupts, external of INT n. */
193	IDTE_INT_GEN(), /* 3b - - I - - User defined Interrupts, external of INT n. */
194	IDTE_INT_GEN(), /* 3c - - I - - User defined Interrupts, external of INT n. */
195	IDTE_INT_GEN(), /* 3d - - I - - User defined Interrupts, external of INT n. */
196	IDTE_INT_GEN(), /* 3e - - I - - User defined Interrupts, external of INT n. */
197	IDTE_INT_GEN(), /* 3f - - I - - User defined Interrupts, external of INT n. */
198	IDTE_INT_GEN(), /* 40 - - I - - User defined Interrupts, external of INT n. */
199	IDTE_INT_GEN(), /* 41 - - I - - User defined Interrupts, external of INT n. */
200	IDTE_INT_GEN(), /* 42 - - I - - User defined Interrupts, external of INT n. */
201	IDTE_INT_GEN(), /* 43 - - I - - User defined Interrupts, external of INT n. */
202	IDTE_INT_GEN(), /* 44 - - I - - User defined Interrupts, external of INT n. */
203	IDTE_INT_GEN(), /* 45 - - I - - User defined Interrupts, external of INT n. */
204	IDTE_INT_GEN(), /* 46 - - I - - User defined Interrupts, external of INT n. */
205	IDTE_INT_GEN(), /* 47 - - I - - User defined Interrupts, external of INT n. */
206	IDTE_INT_GEN(), /* 48 - - I - - User defined Interrupts, external of INT n. */
207	IDTE_INT_GEN(), /* 49 - - I - - User defined Interrupts, external of INT n. */
208	IDTE_INT_GEN(), /* 4a - - I - - User defined Interrupts, external of INT n. */
209	IDTE_INT_GEN(), /* 4b - - I - - User defined Interrupts, external of INT n. */
210	IDTE_INT_GEN(), /* 4c - - I - - User defined Interrupts, external of INT n. */
211	IDTE_INT_GEN(), /* 4d - - I - - User defined Interrupts, external of INT n. */
212	IDTE_INT_GEN(), /* 4e - - I - - User defined Interrupts, external of INT n. */
213	IDTE_INT_GEN(), /* 4f - - I - - User defined Interrupts, external of INT n. */
214	IDTE_INT_GEN(), /* 50 - - I - - User defined Interrupts, external of INT n. */
215	IDTE_INT_GEN(), /* 51 - - I - - User defined Interrupts, external of INT n. */
216	IDTE_INT_GEN(), /* 52 - - I - - User defined Interrupts, external of INT n. */
217	IDTE_INT_GEN(), /* 53 - - I - - User defined Interrupts, external of INT n. */
218	IDTE_INT_GEN(), /* 54 - - I - - User defined Interrupts, external of INT n. */
219	IDTE_INT_GEN(), /* 55 - - I - - User defined Interrupts, external of INT n. */
220	IDTE_INT_GEN(), /* 56 - - I - - User defined Interrupts, external of INT n. */
221	IDTE_INT_GEN(), /* 57 - - I - - User defined Interrupts, external of INT n. */
222	IDTE_INT_GEN(), /* 58 - - I - - User defined Interrupts, external of INT n. */
223	IDTE_INT_GEN(), /* 59 - - I - - User defined Interrupts, external of INT n. */
224	IDTE_INT_GEN(), /* 5a - - I - - User defined Interrupts, external of INT n. */
225	IDTE_INT_GEN(), /* 5b - - I - - User defined Interrupts, external of INT n. */
226	IDTE_INT_GEN(), /* 5c - - I - - User defined Interrupts, external of INT n. */
227	IDTE_INT_GEN(), /* 5d - - I - - User defined Interrupts, external of INT n. */
228	IDTE_INT_GEN(), /* 5e - - I - - User defined Interrupts, external of INT n. */
229	IDTE_INT_GEN(), /* 5f - - I - - User defined Interrupts, external of INT n. */
230	IDTE_INT_GEN(), /* 60 - - I - - User defined Interrupts, external of INT n. */
231	IDTE_INT_GEN(), /* 61 - - I - - User defined Interrupts, external of INT n. */
232	IDTE_INT_GEN(), /* 62 - - I - - User defined Interrupts, external of INT n. */
233	IDTE_INT_GEN(), /* 63 - - I - - User defined Interrupts, external of INT n. */
234	IDTE_INT_GEN(), /* 64 - - I - - User defined Interrupts, external of INT n. */
235	IDTE_INT_GEN(), /* 65 - - I - - User defined Interrupts, external of INT n. */
236	IDTE_INT_GEN(), /* 66 - - I - - User defined Interrupts, external of INT n. */
237	IDTE_INT_GEN(), /* 67 - - I - - User defined Interrupts, external of INT n. */
238	IDTE_INT_GEN(), /* 68 - - I - - User defined Interrupts, external of INT n. */
239	IDTE_INT_GEN(), /* 69 - - I - - User defined Interrupts, external of INT n. */
240	IDTE_INT_GEN(), /* 6a - - I - - User defined Interrupts, external of INT n. */
241	IDTE_INT_GEN(), /* 6b - - I - - User defined Interrupts, external of INT n. */
242	IDTE_INT_GEN(), /* 6c - - I - - User defined Interrupts, external of INT n. */
243	IDTE_INT_GEN(), /* 6d - - I - - User defined Interrupts, external of INT n. */
244	IDTE_INT_GEN(), /* 6e - - I - - User defined Interrupts, external of INT n. */
245	IDTE_INT_GEN(), /* 6f - - I - - User defined Interrupts, external of INT n. */
246	IDTE_INT_GEN(), /* 70 - - I - - User defined Interrupts, external of INT n. */
247	IDTE_INT_GEN(), /* 71 - - I - - User defined Interrupts, external of INT n. */
248	IDTE_INT_GEN(), /* 72 - - I - - User defined Interrupts, external of INT n. */
249	IDTE_INT_GEN(), /* 73 - - I - - User defined Interrupts, external of INT n. */
250	IDTE_INT_GEN(), /* 74 - - I - - User defined Interrupts, external of INT n. */
251	IDTE_INT_GEN(), /* 75 - - I - - User defined Interrupts, external of INT n. */
252	IDTE_INT_GEN(), /* 76 - - I - - User defined Interrupts, external of INT n. */
253	IDTE_INT_GEN(), /* 77 - - I - - User defined Interrupts, external of INT n. */
254	IDTE_INT_GEN(), /* 78 - - I - - User defined Interrupts, external of INT n. */
255	IDTE_INT_GEN(), /* 79 - - I - - User defined Interrupts, external of INT n. */
256	IDTE_INT_GEN(), /* 7a - - I - - User defined Interrupts, external of INT n. */
257	IDTE_INT_GEN(), /* 7b - - I - - User defined Interrupts, external of INT n. */
258	IDTE_INT_GEN(), /* 7c - - I - - User defined Interrupts, external of INT n. */
259	IDTE_INT_GEN(), /* 7d - - I - - User defined Interrupts, external of INT n. */
260	IDTE_INT_GEN(), /* 7e - - I - - User defined Interrupts, external of INT n. */
261	IDTE_INT_GEN(), /* 7f - - I - - User defined Interrupts, external of INT n. */
262	IDTE_INT_GEN(), /* 80 - - I - - User defined Interrupts, external of INT n. */
263	IDTE_INT_GEN(), /* 81 - - I - - User defined Interrupts, external of INT n. */
264	IDTE_INT_GEN(), /* 82 - - I - - User defined Interrupts, external of INT n. */
265	IDTE_INT_GEN(), /* 83 - - I - - User defined Interrupts, external of INT n. */
266	IDTE_INT_GEN(), /* 84 - - I - - User defined Interrupts, external of INT n. */
267	IDTE_INT_GEN(), /* 85 - - I - - User defined Interrupts, external of INT n. */
268	IDTE_INT_GEN(), /* 86 - - I - - User defined Interrupts, external of INT n. */
269	IDTE_INT_GEN(), /* 87 - - I - - User defined Interrupts, external of INT n. */
270	IDTE_INT_GEN(), /* 88 - - I - - User defined Interrupts, external of INT n. */
271	IDTE_INT_GEN(), /* 89 - - I - - User defined Interrupts, external of INT n. */
272	IDTE_INT_GEN(), /* 8a - - I - - User defined Interrupts, external of INT n. */
273	IDTE_INT_GEN(), /* 8b - - I - - User defined Interrupts, external of INT n. */
274	IDTE_INT_GEN(), /* 8c - - I - - User defined Interrupts, external of INT n. */
275	IDTE_INT_GEN(), /* 8d - - I - - User defined Interrupts, external of INT n. */
276	IDTE_INT_GEN(), /* 8e - - I - - User defined Interrupts, external of INT n. */
277	IDTE_INT_GEN(), /* 8f - - I - - User defined Interrupts, external of INT n. */
278	IDTE_INT_GEN(), /* 90 - - I - - User defined Interrupts, external of INT n. */
279	IDTE_INT_GEN(), /* 91 - - I - - User defined Interrupts, external of INT n. */
280	IDTE_INT_GEN(), /* 92 - - I - - User defined Interrupts, external of INT n. */
281	IDTE_INT_GEN(), /* 93 - - I - - User defined Interrupts, external of INT n. */
282	IDTE_INT_GEN(), /* 94 - - I - - User defined Interrupts, external of INT n. */
283	IDTE_INT_GEN(), /* 95 - - I - - User defined Interrupts, external of INT n. */
284	IDTE_INT_GEN(), /* 96 - - I - - User defined Interrupts, external of INT n. */
285	IDTE_INT_GEN(), /* 97 - - I - - User defined Interrupts, external of INT n. */
286	IDTE_INT_GEN(), /* 98 - - I - - User defined Interrupts, external of INT n. */
287	IDTE_INT_GEN(), /* 99 - - I - - User defined Interrupts, external of INT n. */
288	IDTE_INT_GEN(), /* 9a - - I - - User defined Interrupts, external of INT n. */
289	IDTE_INT_GEN(), /* 9b - - I - - User defined Interrupts, external of INT n. */
290	IDTE_INT_GEN(), /* 9c - - I - - User defined Interrupts, external of INT n. */
291	IDTE_INT_GEN(), /* 9d - - I - - User defined Interrupts, external of INT n. */
292	IDTE_INT_GEN(), /* 9e - - I - - User defined Interrupts, external of INT n. */
293	IDTE_INT_GEN(), /* 9f - - I - - User defined Interrupts, external of INT n. */
294	IDTE_INT_GEN(), /* a0 - - I - - User defined Interrupts, external of INT n. */
295	IDTE_INT_GEN(), /* a1 - - I - - User defined Interrupts, external of INT n. */
296	IDTE_INT_GEN(), /* a2 - - I - - User defined Interrupts, external of INT n. */
297	IDTE_INT_GEN(), /* a3 - - I - - User defined Interrupts, external of INT n. */
298	IDTE_INT_GEN(), /* a4 - - I - - User defined Interrupts, external of INT n. */
299	IDTE_INT_GEN(), /* a5 - - I - - User defined Interrupts, external of INT n. */
300	IDTE_INT_GEN(), /* a6 - - I - - User defined Interrupts, external of INT n. */
301	IDTE_INT_GEN(), /* a7 - - I - - User defined Interrupts, external of INT n. */
302	IDTE_INT_GEN(), /* a8 - - I - - User defined Interrupts, external of INT n. */
303	IDTE_INT_GEN(), /* a9 - - I - - User defined Interrupts, external of INT n. */
304	IDTE_INT_GEN(), /* aa - - I - - User defined Interrupts, external of INT n. */
305	IDTE_INT_GEN(), /* ab - - I - - User defined Interrupts, external of INT n. */
306	IDTE_INT_GEN(), /* ac - - I - - User defined Interrupts, external of INT n. */
307	IDTE_INT_GEN(), /* ad - - I - - User defined Interrupts, external of INT n. */
308	IDTE_INT_GEN(), /* ae - - I - - User defined Interrupts, external of INT n. */
309	IDTE_INT_GEN(), /* af - - I - - User defined Interrupts, external of INT n. */
310	IDTE_INT_GEN(), /* b0 - - I - - User defined Interrupts, external of INT n. */
311	IDTE_INT_GEN(), /* b1 - - I - - User defined Interrupts, external of INT n. */
312	IDTE_INT_GEN(), /* b2 - - I - - User defined Interrupts, external of INT n. */
313	IDTE_INT_GEN(), /* b3 - - I - - User defined Interrupts, external of INT n. */
314	IDTE_INT_GEN(), /* b4 - - I - - User defined Interrupts, external of INT n. */
315	IDTE_INT_GEN(), /* b5 - - I - - User defined Interrupts, external of INT n. */
316	IDTE_INT_GEN(), /* b6 - - I - - User defined Interrupts, external of INT n. */
317	IDTE_INT_GEN(), /* b7 - - I - - User defined Interrupts, external of INT n. */
318	IDTE_INT_GEN(), /* b8 - - I - - User defined Interrupts, external of INT n. */
319	IDTE_INT_GEN(), /* b9 - - I - - User defined Interrupts, external of INT n. */
320	IDTE_INT_GEN(), /* ba - - I - - User defined Interrupts, external of INT n. */
321	IDTE_INT_GEN(), /* bb - - I - - User defined Interrupts, external of INT n. */
322	IDTE_INT_GEN(), /* bc - - I - - User defined Interrupts, external of INT n. */
323	IDTE_INT_GEN(), /* bd - - I - - User defined Interrupts, external of INT n. */
324	IDTE_INT_GEN(), /* be - - I - - User defined Interrupts, external of INT n. */
325	IDTE_INT_GEN(), /* bf - - I - - User defined Interrupts, external of INT n. */
326	IDTE_INT_GEN(), /* c0 - - I - - User defined Interrupts, external of INT n. */
327	IDTE_INT_GEN(), /* c1 - - I - - User defined Interrupts, external of INT n. */
328	IDTE_INT_GEN(), /* c2 - - I - - User defined Interrupts, external of INT n. */
329	IDTE_INT_GEN(), /* c3 - - I - - User defined Interrupts, external of INT n. */
330	IDTE_INT_GEN(), /* c4 - - I - - User defined Interrupts, external of INT n. */
331	IDTE_INT_GEN(), /* c5 - - I - - User defined Interrupts, external of INT n. */
332	IDTE_INT_GEN(), /* c6 - - I - - User defined Interrupts, external of INT n. */
333	IDTE_INT_GEN(), /* c7 - - I - - User defined Interrupts, external of INT n. */
334	IDTE_INT_GEN(), /* c8 - - I - - User defined Interrupts, external of INT n. */
335	IDTE_INT_GEN(), /* c9 - - I - - User defined Interrupts, external of INT n. */
336	IDTE_INT_GEN(), /* ca - - I - - User defined Interrupts, external of INT n. */
337	IDTE_INT_GEN(), /* cb - - I - - User defined Interrupts, external of INT n. */
338	IDTE_INT_GEN(), /* cc - - I - - User defined Interrupts, external of INT n. */
339	IDTE_INT_GEN(), /* cd - - I - - User defined Interrupts, external of INT n. */
340	IDTE_INT_GEN(), /* ce - - I - - User defined Interrupts, external of INT n. */
341	IDTE_INT_GEN(), /* cf - - I - - User defined Interrupts, external of INT n. */
342	IDTE_INT_GEN(), /* d0 - - I - - User defined Interrupts, external of INT n. */
343	IDTE_INT_GEN(), /* d1 - - I - - User defined Interrupts, external of INT n. */
344	IDTE_INT_GEN(), /* d2 - - I - - User defined Interrupts, external of INT n. */
345	IDTE_INT_GEN(), /* d3 - - I - - User defined Interrupts, external of INT n. */
346	IDTE_INT_GEN(), /* d4 - - I - - User defined Interrupts, external of INT n. */
347	IDTE_INT_GEN(), /* d5 - - I - - User defined Interrupts, external of INT n. */
348	IDTE_INT_GEN(), /* d6 - - I - - User defined Interrupts, external of INT n. */
349	IDTE_INT_GEN(), /* d7 - - I - - User defined Interrupts, external of INT n. */
350	IDTE_INT_GEN(), /* d8 - - I - - User defined Interrupts, external of INT n. */
351	IDTE_INT_GEN(), /* d9 - - I - - User defined Interrupts, external of INT n. */
352	IDTE_INT_GEN(), /* da - - I - - User defined Interrupts, external of INT n. */
353	IDTE_INT_GEN(), /* db - - I - - User defined Interrupts, external of INT n. */
354	IDTE_INT_GEN(), /* dc - - I - - User defined Interrupts, external of INT n. */
355	IDTE_INT_GEN(), /* dd - - I - - User defined Interrupts, external of INT n. */
356	IDTE_INT_GEN(), /* de - - I - - User defined Interrupts, external of INT n. */
357	IDTE_INT_GEN(), /* df - - I - - User defined Interrupts, external of INT n. */
358	IDTE_INT_GEN(), /* e0 - - I - - User defined Interrupts, external of INT n. */
359	IDTE_INT_GEN(), /* e1 - - I - - User defined Interrupts, external of INT n. */
360	IDTE_INT_GEN(), /* e2 - - I - - User defined Interrupts, external of INT n. */
361	IDTE_INT_GEN(), /* e3 - - I - - User defined Interrupts, external of INT n. */
362	IDTE_INT_GEN(), /* e4 - - I - - User defined Interrupts, external of INT n. */
363	IDTE_INT_GEN(), /* e5 - - I - - User defined Interrupts, external of INT n. */
364	IDTE_INT_GEN(), /* e6 - - I - - User defined Interrupts, external of INT n. */
365	IDTE_INT_GEN(), /* e7 - - I - - User defined Interrupts, external of INT n. */
366	IDTE_INT_GEN(), /* e8 - - I - - User defined Interrupts, external of INT n. */
367	IDTE_INT_GEN(), /* e9 - - I - - User defined Interrupts, external of INT n. */
368	IDTE_INT_GEN(), /* ea - - I - - User defined Interrupts, external of INT n. */
369	IDTE_INT_GEN(), /* eb - - I - - User defined Interrupts, external of INT n. */
370	IDTE_INT_GEN(), /* ec - - I - - User defined Interrupts, external of INT n. */
371	IDTE_INT_GEN(), /* ed - - I - - User defined Interrupts, external of INT n. */
372	IDTE_INT_GEN(), /* ee - - I - - User defined Interrupts, external of INT n. */
373	IDTE_INT_GEN(), /* ef - - I - - User defined Interrupts, external of INT n. */
374	IDTE_INT_GEN(), /* f0 - - I - - User defined Interrupts, external of INT n. */
375	IDTE_INT_GEN(), /* f1 - - I - - User defined Interrupts, external of INT n. */
376	IDTE_INT_GEN(), /* f2 - - I - - User defined Interrupts, external of INT n. */
377	IDTE_INT_GEN(), /* f3 - - I - - User defined Interrupts, external of INT n. */
378	IDTE_INT_GEN(), /* f4 - - I - - User defined Interrupts, external of INT n. */
379	IDTE_INT_GEN(), /* f5 - - I - - User defined Interrupts, external of INT n. */
380	IDTE_INT_GEN(), /* f6 - - I - - User defined Interrupts, external of INT n. */
381	IDTE_INT_GEN(), /* f7 - - I - - User defined Interrupts, external of INT n. */
382	IDTE_INT_GEN(), /* f8 - - I - - User defined Interrupts, external of INT n. */
383	IDTE_INT_GEN(), /* f9 - - I - - User defined Interrupts, external of INT n. */
384	IDTE_INT_GEN(), /* fa - - I - - User defined Interrupts, external of INT n. */
385	IDTE_INT_GEN(), /* fb - - I - - User defined Interrupts, external of INT n. */
386	IDTE_INT_GEN(), /* fc - - I - - User defined Interrupts, external of INT n. */
387	IDTE_INT_GEN(), /* fd - - I - - User defined Interrupts, external of INT n. */
388	IDTE_INT_GEN(), /* fe - - I - - User defined Interrupts, external of INT n. */
389	IDTE_INT_GEN(), /* ff - - I - - User defined Interrupts, external of INT n. */
390	#undef IDTE_TRAP
391	#undef IDTE_TRAP_GEN
392	#undef IDTE_INT
393	#undef IDTE_INT_GEN
394	#undef IDTE_TASK
395	#undef IDTE_UNUSED
396	#undef IDTE_RESERVED
397	};
398
399
400	/** Enable or disable tracking of Guest's IDT. */
401	#define TRPM_TRACK_GUEST_IDT_CHANGES
402
403	/** Enable or disable tracking of Shadow IDT. */
404	#define TRPM_TRACK_SHADOW_IDT_CHANGES
405
406	/** TRPM saved state version. */
407	#define TRPM_SAVED_STATE_VERSION 8
408
409
410	/*******************************************************************************
411	* Internal Functions *
412	*******************************************************************************/
413	static DECLCALLBACK(int) trpmR3Save(PVM pVM, PSSMHANDLE pSSM);
414	static DECLCALLBACK(int) trpmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
415	static DECLCALLBACK(int) trpmGuestIDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
416
417
418	/**
419	* Initializes the Trap Manager
420	*
421	* @returns VBox status code.
422	* @param pVM The VM to operate on.
423	*/
424	TRPMR3DECL(int) TRPMR3Init(PVM pVM)
425	{
426	LogFlow(("TRPMR3Init\n"));
427	/*
428	* Assert sizes and alignments.
429	*/
430	AssertRelease(!(RT_OFFSETOF(VM, trpm.s) & 31));
431	AssertRelease(!(RT_OFFSETOF(VM, trpm.s.aIdt) & 15));
432	AssertRelease(sizeof(pVM->trpm.s) <= sizeof(pVM->trpm.padding));
433	AssertRelease(ELEMENTS(pVM->trpm.s.aGuestTrapHandler) == sizeof(pVM->trpm.s.au32IdtPatched)*8);
434
435	/*
436	* Initialize members.
437	*/
438	pVM->trpm.s.offVM = RT_OFFSETOF(VM, trpm);
439	pVM->trpm.s.uActiveVector = ~0;
440	pVM->trpm.s.GuestIdtr.pIdt = ~0;
441	pVM->trpm.s.GCPtrIdt = ~0;
442	pVM->trpm.s.fDisableMonitoring = false;
443	pVM->trpm.s.fSafeToDropGuestIDTMonitoring = false;
444
445	/*
446	* Read the configuration (if any).
447	*/
448	PCFGMNODE pTRPMNode = CFGMR3GetChild(CFGMR3GetRoot(pVM), "TRPM");
449	if (pTRPMNode)
450	{
451	bool f;
452	int rc = CFGMR3QueryBool(pTRPMNode, "SafeToDropGuestIDTMonitoring", &f);
453	if (RT_SUCCESS(rc))
454	pVM->trpm.s.fSafeToDropGuestIDTMonitoring = f;
455	}
456
457	/* write config summary to log */
458	if (pVM->trpm.s.fSafeToDropGuestIDTMonitoring)
459	LogRel(("TRPM: Dropping Guest IDT Monitoring.\n"));
460
461	/*
462	* Initialize the IDT.
463	* The handler addresses will be set in the TRPMR3Relocate() function.
464	*/
465	Assert(sizeof(pVM->trpm.s.aIdt) == sizeof(g_aIdt));
466	memcpy(&pVM->trpm.s.aIdt[0], &g_aIdt[0], sizeof(pVM->trpm.s.aIdt));
467
468	/*
469	* Register the saved state data unit.
470	*/
471	int rc = SSMR3RegisterInternal(pVM, "trpm", 1, TRPM_SAVED_STATE_VERSION, sizeof(TRPM),
472	NULL, trpmR3Save, NULL,
473	NULL, trpmR3Load, NULL);
474	if (VBOX_FAILURE(rc))
475	return rc;
476
477	/*
478	* Statistics.
479	*/
480	STAM_REG(pVM, &pVM->trpm.s.StatGCWriteGuestIDTFault, STAMTYPE_COUNTER, "/TRPM/GC/Write/IDT/Fault", STAMUNIT_OCCURENCES, "The number of writes to the Guest IDT.");
481	STAM_REG(pVM, &pVM->trpm.s.StatGCWriteGuestIDTHandled, STAMTYPE_COUNTER, "/TRPM/GC/Write/IDT/Handled", STAMUNIT_OCCURENCES, "The number of writes to the Guest IDT.");
482
483	STAM_REG(pVM, &pVM->trpm.s.StatSyncIDT, STAMTYPE_PROFILE, "/PROF/TRPM/SyncIDT", STAMUNIT_TICKS_PER_CALL, "Profiling of TRPMR3SyncIDT().");
484
485	/* traps */
486	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x00], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/00", STAMUNIT_TICKS_PER_CALL, "#DE - Divide error.");
487	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x01], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/01", STAMUNIT_TICKS_PER_CALL, "#DB - Debug (single step and more).");
488	//STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x02], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/02", STAMUNIT_TICKS_PER_CALL, "NMI");
489	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x03], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/03", STAMUNIT_TICKS_PER_CALL, "#BP - Breakpoint.");
490	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x04], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/04", STAMUNIT_TICKS_PER_CALL, "#OF - Overflow.");
491	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x05], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/05", STAMUNIT_TICKS_PER_CALL, "#BR - Bound range exceeded.");
492	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x06], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/06", STAMUNIT_TICKS_PER_CALL, "#UD - Undefined opcode.");
493	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x07], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/07", STAMUNIT_TICKS_PER_CALL, "#NM - Device not available (FPU).");
494	//STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x08], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/08", STAMUNIT_TICKS_PER_CALL, "#DF - Double fault.");
495	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x09], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/09", STAMUNIT_TICKS_PER_CALL, "#?? - Coprocessor segment overrun (obsolete).");
496	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0a], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0a", STAMUNIT_TICKS_PER_CALL, "#TS - Task switch fault.");
497	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0b], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0b", STAMUNIT_TICKS_PER_CALL, "#NP - Segemnt not present.");
498	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0c], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0c", STAMUNIT_TICKS_PER_CALL, "#SS - Stack segment fault.");
499	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0d], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0d", STAMUNIT_TICKS_PER_CALL, "#GP - General protection fault.");
500	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0e], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0e", STAMUNIT_TICKS_PER_CALL, "#PF - Page fault.");
501	//STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x0f], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/0f", STAMUNIT_TICKS_PER_CALL, "Reserved.");
502	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x10], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/10", STAMUNIT_TICKS_PER_CALL, "#MF - Math fault..");
503	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x11], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/11", STAMUNIT_TICKS_PER_CALL, "#AC - Alignment check.");
504	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x12], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/12", STAMUNIT_TICKS_PER_CALL, "#MC - Machine check.");
505	STAM_REG(pVM, &pVM->trpm.s.aStatGCTraps[0x13], STAMTYPE_PROFILE_ADV, "/TRPM/GC/Traps/13", STAMUNIT_TICKS_PER_CALL, "#XF - SIMD Floating-Point Exception.");
506
507	#ifdef VBOX_WITH_STATISTICS
508	rc = MMHyperAlloc(pVM, sizeof(STAMCOUNTER) * 255, 8, MM_TAG_STAM, (void **)&pVM->trpm.s.paStatForwardedIRQR3);
509	AssertRCReturn(rc, rc);
510	pVM->trpm.s.paStatForwardedIRQGC = MMHyperR3ToGC(pVM, pVM->trpm.s.paStatForwardedIRQR3);
511	pVM->trpm.s.paStatForwardedIRQR0 = MMHyperR3ToR0(pVM, pVM->trpm.s.paStatForwardedIRQR3);
512	for (unsigned i = 0; i < 255; i++)
513	STAMR3RegisterF(pVM, &pVM->trpm.s.paStatForwardedIRQR3[i], STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_OCCURENCES, "Forwarded interrupts.",
514	i < 0x20 ? "/TRPM/ForwardRaw/TRAP/%02X" : "/TRPM/ForwardRaw/IRQ/%02X", i);
515	#endif
516	STAM_REG(pVM, &pVM->trpm.s.StatForwardFailNoHandler, STAMTYPE_COUNTER, "/TRPM/ForwardRaw/Fail/NoHandler", STAMUNIT_OCCURENCES, "Failure to forward interrupt in raw mode.");
517	STAM_REG(pVM, &pVM->trpm.s.StatForwardFailPatchAddr, STAMTYPE_COUNTER, "/TRPM/ForwardRaw/Fail/PatchAddr", STAMUNIT_OCCURENCES, "Failure to forward interrupt in raw mode.");
518
519	STAM_REG(pVM, &pVM->trpm.s.StatForwardFailGC, STAMTYPE_COUNTER, "/TRPM/ForwardRaw/Fail/GC", STAMUNIT_OCCURENCES, "Failure to forward interrupt in raw mode.");
520	STAM_REG(pVM, &pVM->trpm.s.StatForwardFailHC, STAMTYPE_COUNTER, "/TRPM/ForwardRaw/Fail/HC", STAMUNIT_OCCURENCES, "Failure to forward interrupt in raw mode.");
521	STAM_REG(pVM, &pVM->trpm.s.StatForwardProfGC, STAMTYPE_PROFILE_ADV, "/TRPM/ForwardRaw/Prof/GC", STAMUNIT_TICKS_PER_CALL, "Profiling TRPMForwardTrap.");
522	STAM_REG(pVM, &pVM->trpm.s.StatForwardProfHC, STAMTYPE_PROFILE_ADV, "/TRPM/ForwardRaw/Prof/HC", STAMUNIT_TICKS_PER_CALL, "Profiling TRPMForwardTrap.");
523
524	STAM_REG(pVM, &pVM->trpm.s.StatTrap0dDisasm, STAMTYPE_PROFILE, "/TRPM/GC/Traps/0d/Disasm", STAMUNIT_TICKS_PER_CALL, "Profiling disassembly part of trpmGCTrap0dHandler.");
525	STAM_REG(pVM, &pVM->trpm.s.StatTrap0dRdTsc, STAMTYPE_COUNTER, "/TRPM/GC/Traps/0d/RdTsc", STAMUNIT_OCCURENCES, "Number of RDTSC #GPs.");
526
527	/*
528	* Default action when entering raw mode for the first time
529	*/
530	VM_FF_SET(pVM, VM_FF_TRPM_SYNC_IDT);
531	return 0;
532	}
533
534
535	/**
536	* Applies relocations to data and code managed by this component.
537	*
538	* This function will be called at init and whenever the VMM need
539	* to relocate itself inside the GC.
540	*
541	* @param pVM The VM handle.
542	* @param offDelta Relocation delta relative to old location.
543	*/
544	TRPMR3DECL(void) TRPMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
545	{
546	LogFlow(("TRPMR3Relocate\n"));
547	/*
548	* Get the trap handler addresses.
549	*
550	* If VMMGC.gc is screwed, so are we. We'll assert here since it elsewise
551	* would make init order impossible if we should assert the presence of these
552	* exports in TRPMR3Init().
553	*/
554	RTGCPTR aGCPtrs[TRPM_HANDLER_MAX] = {0};
555	int rc;
556	rc = PDMR3GetSymbolGC(pVM, VMMGC_MAIN_MODULE_NAME, "TRPMGCHandlerInterupt", &aGCPtrs[TRPM_HANDLER_INT]);
557	AssertReleaseMsgRC(rc, ("Couldn't find TRPMGCHandlerInterupt in VMMGC.gc!\n"));
558
559	rc = PDMR3GetSymbolGC(pVM, VMMGC_MAIN_MODULE_NAME, "TRPMGCHandlerGeneric", &aGCPtrs[TRPM_HANDLER_TRAP]);
560	AssertReleaseMsgRC(rc, ("Couldn't find TRPMGCHandlerGeneric in VMMGC.gc!\n"));
561
562	rc = PDMR3GetSymbolGC(pVM, VMMGC_MAIN_MODULE_NAME, "TRPMGCHandlerTrap08", &aGCPtrs[TRPM_HANDLER_TRAP_08]);
563	AssertReleaseMsgRC(rc, ("Couldn't find TRPMGCHandlerTrap08 in VMMGC.gc!\n"));
564
565	rc = PDMR3GetSymbolGC(pVM, VMMGC_MAIN_MODULE_NAME, "TRPMGCHandlerTrap12", &aGCPtrs[TRPM_HANDLER_TRAP_12]);
566	AssertReleaseMsgRC(rc, ("Couldn't find TRPMGCHandlerTrap12 in VMMGC.gc!\n"));
567
568	RTSEL SelCS = CPUMGetHyperCS(pVM);
569
570	/*
571	* Iterate the idt and set the addresses.
572	*/
573	PVBOXIDTE pIdte = &pVM->trpm.s.aIdt[0];
574	PVBOXIDTE_GENERIC pIdteTemplate = &g_aIdt[0];
575	for (unsigned i = 0; i < ELEMENTS(pVM->trpm.s.aIdt); i++, pIdte++, pIdteTemplate++)
576	{
577	if ( pIdte->Gen.u1Present
578	&& !ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], i)
579	)
580	{
581	Assert(pIdteTemplate->u16OffsetLow < TRPM_HANDLER_MAX);
582	RTGCPTR Offset = aGCPtrs[pIdteTemplate->u16OffsetLow];
583	switch (pIdteTemplate->u16OffsetLow)
584	{
585	/*
586	* Generic handlers have different entrypoints for each possible
587	* vector number. These entrypoints makes a sort of an array with
588	* 8 byte entries where the vector number is the index.
589	* See TRPMGCHandlersA.asm for details.
590	*/
591	case TRPM_HANDLER_INT:
592	case TRPM_HANDLER_TRAP:
593	Offset += i * 8;
594	break;
595	case TRPM_HANDLER_TRAP_12:
596	break;
597	case TRPM_HANDLER_TRAP_08:
598	/* Handle #DF Task Gate in special way. */
599	pIdte->Gen.u16SegSel = SELMGetTrap8Selector(pVM);
600	pIdte->Gen.u16OffsetLow = 0;
601	pIdte->Gen.u16OffsetHigh = 0;
602	SELMSetTrap8EIP(pVM, Offset);
603	continue;
604	}
605	/* (non-task gates only ) */
606	pIdte->Gen.u16OffsetLow = Offset & 0xffff;
607	pIdte->Gen.u16OffsetHigh = Offset >> 16;
608	pIdte->Gen.u16SegSel = SelCS;
609	}
610	}
611
612	/*
613	* Update IDTR (limit is including!).
614	*/
615	CPUMSetHyperIDTR(pVM, VM_GUEST_ADDR(pVM, &pVM->trpm.s.aIdt[0]), sizeof(pVM->trpm.s.aIdt)-1);
616
617	if (!pVM->trpm.s.fDisableMonitoring)
618	{
619	#ifdef TRPM_TRACK_SHADOW_IDT_CHANGES
620	if (pVM->trpm.s.GCPtrIdt != ~0U)
621	{
622	rc = PGMHandlerVirtualDeregister(pVM, pVM->trpm.s.GCPtrIdt);
623	AssertRC(rc);
624	}
625	pVM->trpm.s.GCPtrIdt = VM_GUEST_ADDR(pVM, &pVM->trpm.s.aIdt[0]);
626	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->trpm.s.GCPtrIdt, pVM->trpm.s.GCPtrIdt + sizeof(pVM->trpm.s.aIdt) - 1,
627	0, 0, "trpmgcShadowIDTWriteHandler", 0, "Shadow IDT write access handler");
628	AssertRC(rc);
629	#endif
630	}
631
632	/* Relocate IDT handlers for forwarding guest traps/interrupts. */
633	for (uint32_t iTrap = 0; iTrap < ELEMENTS(pVM->trpm.s.aGuestTrapHandler); iTrap++)
634	{
635	if (pVM->trpm.s.aGuestTrapHandler[iTrap] != TRPM_INVALID_HANDLER)
636	{
637	Log(("TRPMR3Relocate: iGate=%2X Handler %VGv -> %VGv\n", iTrap, pVM->trpm.s.aGuestTrapHandler[iTrap], pVM->trpm.s.aGuestTrapHandler[iTrap] + offDelta));
638	pVM->trpm.s.aGuestTrapHandler[iTrap] += offDelta;
639	}
640
641	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
642	{
643	PVBOXIDTE pIdte = &pVM->trpm.s.aIdt[iTrap];
644	RTGCPTR pHandler = (pIdte->Gen.u16OffsetHigh << 16) \| pIdte->Gen.u16OffsetLow;
645
646	Log(("TRPMR3Relocate: *iGate=%2X Handler %VGv -> %VGv\n", iTrap, pHandler, pHandler + offDelta));
647	pHandler += offDelta;
648
649	pIdte->Gen.u16OffsetHigh = pHandler >> 16;
650	pIdte->Gen.u16OffsetLow = pHandler & 0xFFFF;
651
652	}
653	}
654
655	pVM->trpm.s.paStatForwardedIRQGC += offDelta;
656	pVM->trpm.s.paStatForwardedIRQR0 = MMHyperR3ToR0(pVM, pVM->trpm.s.paStatForwardedIRQR3);
657	}
658
659
660	/**
661	* Terminates the Trap Manager
662	*
663	* @returns VBox status code.
664	* @param pVM The VM to operate on.
665	*/
666	TRPMR3DECL(int) TRPMR3Term(PVM pVM)
667	{
668	NOREF(pVM);
669	return 0;
670	}
671
672
673	/**
674	* The VM is being reset.
675	*
676	* For the TRPM component this means that any IDT write monitors
677	* needs to be removed, any pending trap cleared, and the IDT reset.
678	*
679	* @param pVM VM handle.
680	*/
681	TRPMR3DECL(void) TRPMR3Reset(PVM pVM)
682	{
683	/*
684	* Deregister any virtual handlers.
685	*/
686	#ifdef TRPM_TRACK_GUEST_IDT_CHANGES
687	if (pVM->trpm.s.GuestIdtr.pIdt != ~0U)
688	{
689	if (!pVM->trpm.s.fSafeToDropGuestIDTMonitoring)
690	{
691	int rc = PGMHandlerVirtualDeregister(pVM, pVM->trpm.s.GuestIdtr.pIdt);
692	AssertRC(rc);
693	}
694	pVM->trpm.s.GuestIdtr.pIdt = ~0U;
695	}
696	pVM->trpm.s.GuestIdtr.cbIdt = 0;
697	#endif
698
699	/*
700	* Reinitialize other members calling the relocator to get things right.
701	*/
702	pVM->trpm.s.uActiveVector = ~0;
703	memcpy(&pVM->trpm.s.aIdt[0], &g_aIdt[0], sizeof(pVM->trpm.s.aIdt));
704	memset(pVM->trpm.s.aGuestTrapHandler, 0, sizeof(pVM->trpm.s.aGuestTrapHandler));
705	TRPMR3Relocate(pVM, 0);
706
707	/*
708	* Default action when entering raw mode for the first time
709	*/
710	VM_FF_SET(pVM, VM_FF_TRPM_SYNC_IDT);
711	}
712
713
714	/**
715	* Execute state save operation.
716	*
717	* @returns VBox status code.
718	* @param pVM VM Handle.
719	* @param pSSM SSM operation handle.
720	*/
721	static DECLCALLBACK(int) trpmR3Save(PVM pVM, PSSMHANDLE pSSM)
722	{
723	LogFlow(("trpmR3Save:\n"));
724
725	/*
726	* Active and saved traps.
727	*/
728	PTRPM pTrpm = &pVM->trpm.s;
729	SSMR3PutUInt(pSSM, pTrpm->uActiveVector);
730	SSMR3PutUInt(pSSM, pTrpm->enmActiveType);
731	SSMR3PutGCUInt(pSSM, pTrpm->uActiveErrorCode);
732	SSMR3PutGCUIntPtr(pSSM, pTrpm->uActiveCR2);
733	SSMR3PutGCUInt(pSSM, pTrpm->uSavedVector);
734	SSMR3PutUInt(pSSM, pTrpm->enmSavedType);
735	SSMR3PutGCUInt(pSSM, pTrpm->uSavedErrorCode);
736	SSMR3PutGCUIntPtr(pSSM, pTrpm->uSavedCR2);
737	SSMR3PutGCUInt(pSSM, pTrpm->uPrevVector);
738	#if 0 /** @todo Enable this (+ load change) on the next version change. */
739	SSMR3PutBool(pSSM, pTrpm->fDisableMonitoring);
740	#else
741	SSMR3PutGCUInt(pSSM, pTrpm->fDisableMonitoring);
742	#endif
743	SSMR3PutUInt(pSSM, VM_FF_ISSET(pVM, VM_FF_TRPM_SYNC_IDT));
744	SSMR3PutMem(pSSM, &pTrpm->au32IdtPatched[0], sizeof(pTrpm->au32IdtPatched));
745	SSMR3PutU32(pSSM, ~0); /* separator. */
746
747	/*
748	* Save any trampoline gates.
749	*/
750	for (uint32_t iTrap = 0; iTrap < ELEMENTS(pTrpm->aGuestTrapHandler); iTrap++)
751	{
752	if (pTrpm->aGuestTrapHandler[iTrap])
753	{
754	SSMR3PutU32(pSSM, iTrap);
755	SSMR3PutGCPtr(pSSM, pTrpm->aGuestTrapHandler[iTrap]);
756	SSMR3PutMem(pSSM, &pTrpm->aIdt[iTrap], sizeof(pTrpm->aIdt[iTrap]));
757	}
758	}
759
760	return SSMR3PutU32(pSSM, ~0); /* terminator */
761	}
762
763
764	/**
765	* Execute state load operation.
766	*
767	* @returns VBox status code.
768	* @param pVM VM Handle.
769	* @param pSSM SSM operation handle.
770	* @param u32Version Data layout version.
771	*/
772	static DECLCALLBACK(int) trpmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
773	{
774	LogFlow(("trpmR3Load:\n"));
775
776	/*
777	* Validate version.
778	*/
779	if (u32Version != TRPM_SAVED_STATE_VERSION)
780	{
781	Log(("trpmR3Load: Invalid version u32Version=%d!\n", u32Version));
782	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
783	}
784
785	/*
786	* Call the reset function to kick out any handled gates and other potential trouble.
787	*/
788	TRPMR3Reset(pVM);
789
790	/*
791	* Active and saved traps.
792	*/
793	PTRPM pTrpm = &pVM->trpm.s;
794	SSMR3GetUInt(pSSM, &pTrpm->uActiveVector);
795	SSMR3GetUInt(pSSM, (uint32_t *)&pTrpm->enmActiveType);
796	SSMR3GetGCUInt(pSSM, &pTrpm->uActiveErrorCode);
797	SSMR3GetGCUIntPtr(pSSM, &pTrpm->uActiveCR2);
798	SSMR3GetGCUInt(pSSM, &pTrpm->uSavedVector);
799	SSMR3GetUInt(pSSM, (uint32_t *)&pTrpm->enmSavedType);
800	SSMR3GetGCUInt(pSSM, &pTrpm->uSavedErrorCode);
801	SSMR3GetGCUIntPtr(pSSM, &pTrpm->uSavedCR2);
802	SSMR3GetGCUInt(pSSM, &pTrpm->uPrevVector);
803	#if 0 /** @todo Enable this + the corresponding save code on the next version change. */
804	SSMR3GetBool(pSSM, &pTrpm->fDisableMonitoring);
805	#else
806	RTGCUINT fDisableMonitoring;
807	SSMR3GetGCUInt(pSSM, &fDisableMonitoring);
808	pTrpm->fDisableMonitoring = !!fDisableMonitoring;
809	#endif
810
811	RTUINT fSyncIDT;
812	int rc = SSMR3GetUInt(pSSM, &fSyncIDT);
813	if (VBOX_FAILURE(rc))
814	return rc;
815	if (fSyncIDT & ~1)
816	{
817	AssertMsgFailed(("fSyncIDT=%#x\n", fSyncIDT));
818	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
819	}
820	if (fSyncIDT)
821	VM_FF_SET(pVM, VM_FF_TRPM_SYNC_IDT);
822	/* else: cleared by reset call above. */
823
824	SSMR3GetMem(pSSM, &pTrpm->au32IdtPatched[0], sizeof(pTrpm->au32IdtPatched));
825
826	/* check the separator */
827	uint32_t u32Sep;
828	rc = SSMR3GetU32(pSSM, &u32Sep);
829	if (VBOX_FAILURE(rc))
830	return rc;
831	if (u32Sep != (uint32_t)~0)
832	{
833	AssertMsgFailed(("u32Sep=%#x (first)\n", u32Sep));
834	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
835	}
836
837	/*
838	* Restore any trampoline gates.
839	*/
840	for (;;)
841	{
842	/* gate number / terminator */
843	uint32_t iTrap;
844	rc = SSMR3GetU32(pSSM, &iTrap);
845	if (VBOX_FAILURE(rc))
846	return rc;
847	if (iTrap == (uint32_t)~0)
848	break;
849	if ( iTrap >= ELEMENTS(pTrpm->aIdt)
850	\|\| pTrpm->aGuestTrapHandler[iTrap])
851	{
852	AssertMsgFailed(("iTrap=%#x\n", iTrap));
853	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
854	}
855
856	/* restore the IDT entry. */
857	RTGCPTR GCPtrHandler;
858	SSMR3GetGCPtr(pSSM, &GCPtrHandler);
859	VBOXIDTE Idte;
860	rc = SSMR3GetMem(pSSM, &Idte, sizeof(Idte));
861	if (VBOX_FAILURE(rc))
862	return rc;
863	Assert(GCPtrHandler);
864	pTrpm->aIdt[iTrap] = Idte;
865	}
866
867	return VINF_SUCCESS;
868	}
869
870
871	/**
872	* Check if gate handlers were updated
873	* (callback for the VM_FF_TRPM_SYNC_IDT forced action).
874	*
875	* @returns VBox status code.
876	* @param pVM The VM handle.
877	*/
878	TRPMR3DECL(int) TRPMR3SyncIDT(PVM pVM)
879	{
880	STAM_PROFILE_START(&pVM->trpm.s.StatSyncIDT, a);
881	const bool fRawRing0 = EMIsRawRing0Enabled(pVM);
882	int rc;
883
884	if (pVM->trpm.s.fDisableMonitoring)
885	{
886	VM_FF_CLEAR(pVM, VM_FF_TRPM_SYNC_IDT);
887	return VINF_SUCCESS; /* Nothing to do */
888	}
889
890	if (fRawRing0 && CSAMIsEnabled(pVM))
891	{
892	/* Clear all handlers */
893	Log(("TRPMR3SyncIDT: Clear all trap handlers.\n"));
894	/** @todo inefficient, but simple */
895	for (unsigned iGate = 0; iGate < 256; iGate++)
896	trpmClearGuestTrapHandler(pVM, iGate);
897
898	/* Scan them all (only the first time) */
899	CSAMR3CheckGates(pVM, 0, 256);
900	}
901
902	/*
903	* Get the IDTR.
904	*/
905	VBOXIDTR IDTR;
906	IDTR.pIdt = CPUMGetGuestIDTR(pVM, &IDTR.cbIdt);
907	if (!IDTR.cbIdt)
908	{
909	Log(("No IDT entries...\n"));
910	return DBGFSTOP(pVM);
911	}
912
913	#ifdef TRPM_TRACK_GUEST_IDT_CHANGES
914	/*
915	* Check if Guest's IDTR has changed.
916	*/
917	if ( IDTR.pIdt != pVM->trpm.s.GuestIdtr.pIdt
918	\|\| IDTR.cbIdt != pVM->trpm.s.GuestIdtr.cbIdt)
919	{
920	Log(("TRPMR3UpdateFromCPUM: Guest's IDT is changed to pIdt=%08X cbIdt=%08X\n", IDTR.pIdt, IDTR.cbIdt));
921	if (!pVM->trpm.s.fSafeToDropGuestIDTMonitoring)
922	{
923	/*
924	* [Re]Register write virtual handler for guest's IDT.
925	*/
926	if (pVM->trpm.s.GuestIdtr.pIdt != ~0U)
927	{
928	rc = PGMHandlerVirtualDeregister(pVM, pVM->trpm.s.GuestIdtr.pIdt);
929	AssertRCReturn(rc, rc);
930	}
931	/* limit is including */
932	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, IDTR.pIdt, IDTR.pIdt + IDTR.cbIdt /* already inclusive */,
933	0, trpmGuestIDTWriteHandler, "trpmgcGuestIDTWriteHandler", 0, "Guest IDT write access handler");
934
935	if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
936	{
937	/* Could be a conflict with CSAM */
938	CSAMR3RemovePage(pVM, IDTR.pIdt);
939	if (PAGE_ADDRESS(IDTR.pIdt) != PAGE_ADDRESS(IDTR.pIdt + IDTR.cbIdt))
940	CSAMR3RemovePage(pVM, IDTR.pIdt + IDTR.cbIdt);
941
942	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, IDTR.pIdt, IDTR.pIdt + IDTR.cbIdt /* already inclusive */,
943	0, trpmGuestIDTWriteHandler, "trpmgcGuestIDTWriteHandler", 0, "Guest IDT write access handler");
944	}
945
946	AssertRCReturn(rc, rc);
947	}
948
949	/* Update saved Guest IDTR. */
950	pVM->trpm.s.GuestIdtr = IDTR;
951	}
952	#endif
953
954	/*
955	* Sync the interrupt gate.
956	* Should probably check/sync the others too, but for now we'll handle that in #GP.
957	*/
958	X86DESC Idte3;
959	rc = PGMPhysReadGCPtr(pVM, &Idte3, IDTR.pIdt + sizeof(Idte3) * 3, sizeof(Idte3));
960	if (VBOX_FAILURE(rc))
961	{
962	AssertMsgRC(rc, ("Failed to read IDT[3]! rc=%Vrc\n", rc));
963	return DBGFSTOP(pVM);
964	}
965	AssertRCReturn(rc, rc);
966	if (fRawRing0)
967	pVM->trpm.s.aIdt[3].Gen.u2DPL = RT_MAX(Idte3.Gen.u2Dpl, 1);
968	else
969	pVM->trpm.s.aIdt[3].Gen.u2DPL = Idte3.Gen.u2Dpl;
970
971	/*
972	* Clear the FF and we're done.
973	*/
974	VM_FF_CLEAR(pVM, VM_FF_TRPM_SYNC_IDT);
975	STAM_PROFILE_STOP(&pVM->trpm.s.StatSyncIDT, a);
976	return VINF_SUCCESS;
977	}
978
979
980	/**
981	* Disable IDT monitoring and syncing
982	*
983	* @param pVM The VM to operate on.
984	*/
985	TRPMR3DECL(void) TRPMR3DisableMonitoring(PVM pVM)
986	{
987	/*
988	* Deregister any virtual handlers.
989	*/
990	#ifdef TRPM_TRACK_GUEST_IDT_CHANGES
991	if (pVM->trpm.s.GuestIdtr.pIdt != ~0U)
992	{
993	if (!pVM->trpm.s.fSafeToDropGuestIDTMonitoring)
994	{
995	int rc = PGMHandlerVirtualDeregister(pVM, pVM->trpm.s.GuestIdtr.pIdt);
996	AssertRC(rc);
997	}
998	pVM->trpm.s.GuestIdtr.pIdt = ~0U;
999	}
1000	pVM->trpm.s.GuestIdtr.cbIdt = 0;
1001	#endif
1002
1003	#ifdef TRPM_TRACK_SHADOW_IDT_CHANGES
1004	if (pVM->trpm.s.GCPtrIdt != ~0U)
1005	{
1006	int rc = PGMHandlerVirtualDeregister(pVM, pVM->trpm.s.GCPtrIdt);
1007	AssertRC(rc);
1008	pVM->trpm.s.GCPtrIdt = ~0U;
1009	}
1010	#endif
1011
1012	VM_FF_CLEAR(pVM, VM_FF_TRPM_SYNC_IDT);
1013
1014	pVM->trpm.s.fDisableMonitoring = true;
1015	}
1016
1017
1018	/**
1019	* \#PF Handler callback for virtual access handler ranges.
1020	*
1021	* Important to realize that a physical page in a range can have aliases, and
1022	* for ALL and WRITE handlers these will also trigger.
1023	*
1024	* @returns VINF_SUCCESS if the handler have carried out the operation.
1025	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1026	* @param pVM VM Handle.
1027	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1028	* @param pvPtr The HC mapping of that address.
1029	* @param pvBuf What the guest is reading/writing.
1030	* @param cbBuf How much it's reading/writing.
1031	* @param enmAccessType The access type.
1032	* @param pvUser User argument.
1033	*/
1034	static DECLCALLBACK(int) trpmGuestIDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1035	{
1036	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1037	Log(("trpmGuestIDTWriteHandler: write to %VGv size %d\n", GCPtr, cbBuf));
1038	VM_FF_SET(pVM, VM_FF_TRPM_SYNC_IDT);
1039	return VINF_PGM_HANDLER_DO_DEFAULT;
1040	}
1041
1042
1043	/**
1044	* Clear passthrough interrupt gate handler (reset to default handler)
1045	*
1046	* @returns VBox status code.
1047	* @param pVM The VM to operate on.
1048	* @param iTrap Trap/interrupt gate number.
1049	*/
1050	TRPMR3DECL(int) trpmR3ClearPassThroughHandler(PVM pVM, unsigned iTrap)
1051	{
1052	/** @todo cleanup trpmR3ClearPassThroughHandler()! */
1053	RTGCPTR aGCPtrs[TRPM_HANDLER_MAX];
1054	int rc;
1055
1056	memset(aGCPtrs, 0, sizeof(aGCPtrs));
1057
1058	rc = PDMR3GetSymbolGC(pVM, VMMGC_MAIN_MODULE_NAME, "TRPMGCHandlerInterupt", &aGCPtrs[TRPM_HANDLER_INT]);
1059	AssertReleaseMsgRC(rc, ("Couldn't find TRPMGCHandlerInterupt in VMMGC.gc!\n"));
1060
1061	if ( iTrap < TRPM_HANDLER_INT_BASE
1062	\|\| iTrap >= ELEMENTS(pVM->trpm.s.aIdt))
1063	{
1064	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %#x!\n", iTrap));
1065	return VERR_INVALID_PARAMETER;
1066	}
1067	memcpy(&pVM->trpm.s.aIdt[iTrap], &g_aIdt[iTrap], sizeof(pVM->trpm.s.aIdt[0]));
1068
1069	/* Unmark it for relocation purposes. */
1070	ASMBitClear(&pVM->trpm.s.au32IdtPatched[0], iTrap);
1071
1072	RTSEL SelCS = CPUMGetHyperCS(pVM);
1073	PVBOXIDTE pIdte = &pVM->trpm.s.aIdt[iTrap];
1074	PVBOXIDTE_GENERIC pIdteTemplate = &g_aIdt[iTrap];
1075	if (pIdte->Gen.u1Present)
1076	{
1077	Assert(pIdteTemplate->u16OffsetLow == TRPM_HANDLER_INT);
1078	Assert(sizeof(RTGCPTR) <= sizeof(aGCPtrs[0]));
1079	RTGCPTR Offset = (RTGCPTR)aGCPtrs[pIdteTemplate->u16OffsetLow];
1080
1081	/*
1082	* Generic handlers have different entrypoints for each possible
1083	* vector number. These entrypoints make a sort of an array with
1084	* 8 byte entries where the vector number is the index.
1085	* See TRPMGCHandlersA.asm for details.
1086	*/
1087	Offset += iTrap * 8;
1088
1089	if (pIdte->Gen.u5Type2 != VBOX_IDTE_TYPE2_TASK)
1090	{
1091	pIdte->Gen.u16OffsetLow = Offset & 0xffff;
1092	pIdte->Gen.u16OffsetHigh = Offset >> 16;
1093	pIdte->Gen.u16SegSel = SelCS;
1094	}
1095	}
1096
1097	return VINF_SUCCESS;
1098	}
1099
1100
1101	/**
1102	* Check if address is a gate handler (interrupt or trap).
1103	*
1104	* @returns gate nr or ~0 is not found
1105	*
1106	* @param pVM VM handle.
1107	* @param GCPtr GC address to check.
1108	*/
1109	TRPMR3DECL(uint32_t) TRPMR3QueryGateByHandler(PVM pVM, RTGCPTR GCPtr)
1110	{
1111	for (uint32_t iTrap = 0; iTrap < ELEMENTS(pVM->trpm.s.aGuestTrapHandler); iTrap++)
1112	{
1113	if (pVM->trpm.s.aGuestTrapHandler[iTrap] == GCPtr)
1114	return iTrap;
1115
1116	/* redundant */
1117	if (ASMBitTest(&pVM->trpm.s.au32IdtPatched[0], iTrap))
1118	{
1119	PVBOXIDTE pIdte = &pVM->trpm.s.aIdt[iTrap];
1120	RTGCPTR pHandler = (pIdte->Gen.u16OffsetHigh << 16) \| pIdte->Gen.u16OffsetLow;
1121
1122	if (pHandler == GCPtr)
1123	return iTrap;
1124	}
1125	}
1126	return ~0;
1127	}
1128
1129
1130	/**
1131	* Get guest trap/interrupt gate handler
1132	*
1133	* @returns Guest trap handler address or TRPM_INVALID_HANDLER if none installed
1134	* @param pVM The VM to operate on.
1135	* @param iTrap Interrupt/trap number.
1136	*/
1137	TRPMR3DECL(RTGCPTR) TRPMR3GetGuestTrapHandler(PVM pVM, unsigned iTrap)
1138	{
1139	AssertReturn(iTrap < ELEMENTS(pVM->trpm.s.aIdt), TRPM_INVALID_HANDLER);
1140
1141	return pVM->trpm.s.aGuestTrapHandler[iTrap];
1142	}
1143
1144
1145	/**
1146	* Set guest trap/interrupt gate handler
1147	* Used for setting up trap gates used for kernel calls.
1148	*
1149	* @returns VBox status code.
1150	* @param pVM The VM to operate on.
1151	* @param iTrap Interrupt/trap number.
1152	* @param pHandler GC handler pointer
1153	*/
1154	TRPMR3DECL(int) TRPMR3SetGuestTrapHandler(PVM pVM, unsigned iTrap, RTGCPTR pHandler)
1155	{
1156	/*
1157	* Validate.
1158	*/
1159	if (iTrap >= ELEMENTS(pVM->trpm.s.aIdt))
1160	{
1161	AssertMsg(iTrap < TRPM_HANDLER_INT_BASE, ("Illegal gate number %d!\n", iTrap));
1162	return VERR_INVALID_PARAMETER;
1163	}
1164
1165	AssertReturn(pHandler == TRPM_INVALID_HANDLER \|\| PATMIsPatchGCAddr(pVM, pHandler), VERR_INVALID_PARAMETER);
1166
1167	uint16_t cbIDT;
1168	RTGCPTR GCPtrIDT = CPUMGetGuestIDTR(pVM, &cbIDT);
1169	if (iTrap * sizeof(VBOXIDTE) >= cbIDT)
1170	return VERR_INVALID_PARAMETER; /* Silently ignore out of range requests. */
1171
1172	if (pHandler == TRPM_INVALID_HANDLER)
1173	{
1174	/* clear trap handler */
1175	Log(("TRPMR3SetGuestTrapHandler: clear handler %x\n", iTrap));
1176	return trpmClearGuestTrapHandler(pVM, iTrap);
1177	}
1178
1179	/*
1180	* Read the guest IDT entry.
1181	*/
1182	VBOXIDTE GuestIdte;
1183	int rc = PGMPhysReadGCPtr(pVM, &GuestIdte, GCPtrIDT + iTrap * sizeof(GuestIdte), sizeof(GuestIdte));
1184	if (VBOX_FAILURE(rc))
1185	{
1186	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
1187	return rc;
1188	}
1189
1190	if (EMIsRawRing0Enabled(pVM))
1191	{
1192	/*
1193	* Only replace handlers for which we are 100% certain there won't be
1194	* any host interrupts.
1195	*
1196	* 0x2E is safe on Windows because it's the system service interrupt gate. Not
1197	* quite certain if this is safe or not on 64-bit Vista, it probably is.
1198	*
1199	* 0x80 is safe on Linux because it's the syscall vector and is part of the
1200	* 32-bit usermode ABI. 64-bit Linux (usually) supports 32-bit processes
1201	* and will therefor never assign hardware interrupts to 0x80.
1202	*
1203	* Exactly why 0x80 is safe on 32-bit Windows is a bit hazy, but it seems
1204	* to work ok... However on 64-bit Vista (SMP?) is doesn't work reliably.
1205	* Booting Linux/BSD guest will cause system lockups on most of the computers.
1206	*
1207	* PORTME - Check if your host keeps any of these gates free from hw ints.
1208	*
1209	* Note! SELMR3SyncTSS also has code related to this interrupt handler replacing.
1210	*/
1211	/** @todo handle those dependencies better! */
1212	/** @todo Solve this in a proper manner. see defect #1186 */
1213	#if defined(RT_OS_WINDOWS) && defined(RT_ARCH_X86)
1214	if (iTrap == 0x2E \|\| iTrap == 0x80)
1215	#elif defined(RT_OS_LINUX)
1216	if (iTrap == 0x80)
1217	#else
1218	if (0)
1219	#endif
1220	{
1221	if ( GuestIdte.Gen.u1Present
1222	&& ( GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32
1223	\|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
1224	&& GuestIdte.Gen.u2DPL == 3)
1225	{
1226	PVBOXIDTE pIdte = &pVM->trpm.s.aIdt[iTrap];
1227
1228	GuestIdte.Gen.u5Type2 = VBOX_IDTE_TYPE2_TRAP_32;
1229	GuestIdte.Gen.u16OffsetHigh = pHandler >> 16;
1230	GuestIdte.Gen.u16OffsetLow = pHandler & 0xFFFF;
1231	GuestIdte.Gen.u16SegSel \|= 1; //ring 1
1232	*pIdte = GuestIdte;
1233
1234	/* Mark it for relocation purposes. */
1235	ASMBitSet(&pVM->trpm.s.au32IdtPatched[0], iTrap);
1236
1237	/* Also store it in our guest trap array. */
1238	pVM->trpm.s.aGuestTrapHandler[iTrap] = pHandler;
1239
1240	Log(("Setting trap handler %x to %08X (direct)\n", iTrap, pHandler));
1241	return VINF_SUCCESS;
1242	}
1243	/* ok, let's try to install a trampoline handler then. */
1244	}
1245	}
1246
1247	if ( GuestIdte.Gen.u1Present
1248	&& ( GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32
1249	\|\| GuestIdte.Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
1250	&& (GuestIdte.Gen.u2DPL == 3 \|\| GuestIdte.Gen.u2DPL == 0))
1251	{
1252	/*
1253	* Save handler which can be used for a trampoline call inside the GC
1254	*/
1255	Log(("Setting trap handler %x to %08X\n", iTrap, pHandler));
1256	pVM->trpm.s.aGuestTrapHandler[iTrap] = pHandler;
1257	return VINF_SUCCESS;
1258	}
1259	return VERR_INVALID_PARAMETER;
1260	}
1261
1262
1263	/**
1264	* Check if address is a gate handler (interrupt/trap/task/anything).
1265	*
1266	* @returns True is gate handler, false if not.
1267	*
1268	* @param pVM VM handle.
1269	* @param GCPtr GC address to check.
1270	*/
1271	TRPMR3DECL(bool) TRPMR3IsGateHandler(PVM pVM, RTGCPTR GCPtr)
1272	{
1273	/*
1274	* Read IDTR and calc last entry.
1275	*/
1276	uint16_t cbIDT;
1277	RTGCPTR GCPtrIDTE = CPUMGetGuestIDTR(pVM, &cbIDT);
1278	unsigned cEntries = (cbIDT + 1) / sizeof(VBOXIDTE);
1279	if (!cEntries)
1280	return false;
1281	RTGCPTR GCPtrIDTELast = GCPtrIDTE + (cEntries - 1) * sizeof(VBOXIDTE);
1282
1283	/*
1284	* Outer loop: interate pages.
1285	*/
1286	while (GCPtrIDTE <= GCPtrIDTELast)
1287	{
1288	/*
1289	* Convert this page to a HC address.
1290	* (This function checks for not-present pages.)
1291	*/
1292	PVBOXIDTE pIDTE;
1293	int rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrIDTE, (void **)&pIDTE);
1294	if (VBOX_SUCCESS(rc))
1295	{
1296	/*
1297	* Inner Loop: Iterate the data on this page looking for an entry equal to GCPtr.
1298	* N.B. Member of the Flat Earth Society...
1299	*/
1300	while (GCPtrIDTE <= GCPtrIDTELast)
1301	{
1302	if (pIDTE->Gen.u1Present)
1303	{
1304	RTGCPTR GCPtrHandler = (pIDTE->Gen.u16OffsetHigh << 16) \| pIDTE->Gen.u16OffsetLow;
1305	if (GCPtr == GCPtrHandler)
1306	return true;
1307	}
1308
1309	/* next entry */
1310	if ((GCPtrIDTE & PAGE_OFFSET_MASK) + sizeof(VBOXIDTE) >= PAGE_SIZE)
1311	{
1312	AssertMsg(!(GCPtrIDTE & (sizeof(VBOXIDTE) - 1)),
1313	("IDT is crossing pages and it's not aligned! GCPtrIDTE=%#x cbIDT=%#x\n", GCPtrIDTE, cbIDT));
1314	GCPtrIDTE += sizeof(VBOXIDTE);
1315	break;
1316	}
1317	GCPtrIDTE += sizeof(VBOXIDTE);
1318	pIDTE++;
1319	}
1320	}
1321	else
1322	{
1323	/* Skip to the next page (if any). Take care not to wrap around the address space. */
1324	if ((GCPtrIDTELast >> PAGE_SHIFT) == (GCPtrIDTE >> PAGE_SHIFT))
1325	return false;
1326	GCPtrIDTE = RT_ALIGN_T(GCPtrIDTE, PAGE_SIZE, RTGCPTR) + PAGE_SIZE + (GCPtrIDTE & (sizeof(VBOXIDTE) - 1));
1327	}
1328	}
1329	return false;
1330	}
1331
1332
1333	/**
1334	* Inject event (such as external irq or trap)
1335	*
1336	* @returns VBox status code.
1337	* @param pVM The VM to operate on.
1338	* @param enmEvent Trpm event type
1339	*/
1340	TRPMR3DECL(int) TRPMR3InjectEvent(PVM pVM, TRPMEVENT enmEvent)
1341	{
1342	PCPUMCTX pCtx;
1343	int rc;
1344
1345	rc = CPUMQueryGuestCtxPtr(pVM, &pCtx);
1346	AssertRC(rc);
1347	Assert(!PATMIsPatchGCAddr(pVM, (RTGCPTR)pCtx->eip));
1348	Assert(!VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS));
1349
1350	/* Currently only useful for external hardware interrupts. */
1351	Assert(enmEvent == TRPM_HARDWARE_INT);
1352
1353	if (REMR3QueryPendingInterrupt(pVM) == REM_NO_PENDING_IRQ)
1354	{
1355	#ifdef TRPM_FORWARD_TRAPS_IN_GC
1356
1357	# ifdef LOG_ENABLED
1358	DBGFR3InfoLog(pVM, "cpumguest", "TRPMInject");
1359	DBGFR3DisasInstrCurrentLog(pVM, "TRPMInject");
1360	# endif
1361
1362	uint8_t u8Interrupt;
1363	rc = PDMGetInterrupt(pVM, &u8Interrupt);
1364	Log(("TRPMR3InjectEvent: u8Interrupt=%d (%#x) rc=%Vrc\n", u8Interrupt, u8Interrupt, rc));
1365	if (VBOX_SUCCESS(rc))
1366	{
1367	if (HWACCMR3IsActive(pVM))
1368	{
1369	rc = TRPMAssertTrap(pVM, u8Interrupt, enmEvent);
1370	AssertRC(rc);
1371	STAM_COUNTER_INC(&pVM->trpm.s.paStatForwardedIRQR3[u8Interrupt]);
1372	return VINF_EM_RESCHEDULE_HWACC;
1373	}
1374	/* If the guest gate is not patched, then we will check (again) if we can patch it. */
1375	if (pVM->trpm.s.aGuestTrapHandler[u8Interrupt] == TRPM_INVALID_HANDLER)
1376	{
1377	CSAMR3CheckGates(pVM, u8Interrupt, 1);
1378	Log(("TRPMR3InjectEvent: recheck gate %x -> valid=%d\n", u8Interrupt, TRPMR3GetGuestTrapHandler(pVM, u8Interrupt) != TRPM_INVALID_HANDLER));
1379	}
1380
1381	if (pVM->trpm.s.aGuestTrapHandler[u8Interrupt] != TRPM_INVALID_HANDLER)
1382	{
1383	/* Must check pending forced actions as our IDT or GDT might be out of sync */
1384	EMR3CheckRawForcedActions(pVM);
1385
1386	/* There's a handler -> let's execute it in raw mode */
1387	rc = TRPMForwardTrap(pVM, CPUMCTX2CORE(pCtx), u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, enmEvent);
1388	if (rc == VINF_SUCCESS /* Don't use VBOX_SUCCESS */)
1389	{
1390	Assert(!VM_FF_ISPENDING(pVM, VM_FF_SELM_SYNC_GDT \| VM_FF_SELM_SYNC_LDT \| VM_FF_TRPM_SYNC_IDT \| VM_FF_SELM_SYNC_TSS));
1391
1392	STAM_COUNTER_INC(&pVM->trpm.s.paStatForwardedIRQR3[u8Interrupt]);
1393	return VINF_EM_RESCHEDULE_RAW;
1394	}
1395	}
1396	else
1397	STAM_COUNTER_INC(&pVM->trpm.s.StatForwardFailNoHandler);
1398	REMR3NotifyPendingInterrupt(pVM, u8Interrupt);
1399	}
1400	else
1401	AssertRC(rc);
1402	#else
1403	if (HWACCMR3IsActive(pVM))
1404	{
1405	uint8_t u8Interrupt;
1406	rc = PDMGetInterrupt(pVM, &u8Interrupt);
1407	Log(("TRPMR3InjectEvent: u8Interrupt=%d (%#x) rc=%Vrc\n", u8Interrupt, u8Interrupt, rc));
1408	if (VBOX_SUCCESS(rc))
1409	{
1410	rc = TRPMAssertTrap(pVM, u8Interrupt, TRPM_HARDWARE_INT);
1411	AssertRC(rc);
1412	STAM_COUNTER_INC(&pVM->trpm.s.paStatForwardedIRQR3[u8Interrupt]);
1413	return VINF_EM_RESCHEDULE_HWACC;
1414	}
1415	}
1416	else
1417	AssertRC(rc);
1418	#endif
1419	}
1420	/** @todo check if it's safe to translate the patch address to the original guest address.
1421	* this implies a safe state in translated instructions and should take sti successors into account (instruction fusing)
1422	*/
1423	/* Note: if it's a PATM address, then we'll go back to raw mode regardless of the return code below. */
1424
1425	/* Fall back to the recompiler */
1426	return VINF_EM_RESCHEDULE_REM; /* (Heed the halted state if this is changed!) */
1427	}
1428

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source: vbox/trunk/src/VBox/VMM/TRPM.cpp@ 8676

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