summaryrefslogtreecommitdiffstats
path: root/tools/lib/traceevent/plugin_kvm.c
blob: a0e282c6b967a9d9e8f29852aec693bd7473f8a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/*
 * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License (not later!)
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not,  see <http://www.gnu.org/licenses>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include "event-parse.h"

#ifdef HAVE_UDIS86

#include <udis86.h>

static ud_t ud;

static void init_disassembler(void)
{
	ud_init(&ud);
	ud_set_syntax(&ud, UD_SYN_ATT);
}

static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
			       int cr0_pe, int eflags_vm,
			       int cs_d, int cs_l)
{
	int mode;

	if (!cr0_pe)
		mode = 16;
	else if (eflags_vm)
		mode = 16;
	else if (cs_l)
		mode = 64;
	else if (cs_d)
		mode = 32;
	else
		mode = 16;

	ud_set_pc(&ud, rip);
	ud_set_mode(&ud, mode);
	ud_set_input_buffer(&ud, insn, len);
	ud_disassemble(&ud);
	return ud_insn_asm(&ud);
}

#else

static void init_disassembler(void)
{
}

static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
			       int cr0_pe, int eflags_vm,
			       int cs_d, int cs_l)
{
	static char out[15*3+1];
	int i;

	for (i = 0; i < len; ++i)
		sprintf(out + i * 3, "%02x ", insn[i]);
	out[len*3-1] = '\0';
	return out;
}

#endif


#define VMX_EXIT_REASONS			\
	_ER(EXCEPTION_NMI,	 0)		\
	_ER(EXTERNAL_INTERRUPT,	 1)		\
	_ER(TRIPLE_FAULT,	 2)		\
	_ER(PENDING_INTERRUPT,	 7)		\
	_ER(NMI_WINDOW,		 8)		\
	_ER(TASK_SWITCH,	 9)		\
	_ER(CPUID,		 10)		\
	_ER(HLT,		 12)		\
	_ER(INVD,		 13)		\
	_ER(INVLPG,		 14)		\
	_ER(RDPMC,		 15)		\
	_ER(RDTSC,		 16)		\
	_ER(VMCALL,		 18)		\
	_ER(VMCLEAR,		 19)		\
	_ER(VMLAUNCH,		 20)		\
	_ER(VMPTRLD,		 21)		\
	_ER(VMPTRST,		 22)		\
	_ER(VMREAD,		 23)		\
	_ER(VMRESUME,		 24)		\
	_ER(VMWRITE,		 25)		\
	_ER(VMOFF,		 26)		\
	_ER(VMON,		 27)		\
	_ER(CR_ACCESS,		 28)		\
	_ER(DR_ACCESS,		 29)		\
	_ER(IO_INSTRUCTION,	 30)		\
	_ER(MSR_READ,		 31)		\
	_ER(MSR_WRITE,		 32)		\
	_ER(MWAIT_INSTRUCTION,	 36)		\
	_ER(MONITOR_INSTRUCTION, 39)		\
	_ER(PAUSE_INSTRUCTION,	 40)		\
	_ER(MCE_DURING_VMENTRY,	 41)		\
	_ER(TPR_BELOW_THRESHOLD, 43)		\
	_ER(APIC_ACCESS,	 44)		\
	_ER(EOI_INDUCED,	 45)		\
	_ER(EPT_VIOLATION,	 48)		\
	_ER(EPT_MISCONFIG,	 49)		\
	_ER(INVEPT,		 50)		\
	_ER(PREEMPTION_TIMER,	 52)		\
	_ER(WBINVD,		 54)		\
	_ER(XSETBV,		 55)		\
	_ER(APIC_WRITE,		 56)		\
	_ER(INVPCID,		 58)

#define SVM_EXIT_REASONS \
	_ER(EXIT_READ_CR0,	0x000)		\
	_ER(EXIT_READ_CR3,	0x003)		\
	_ER(EXIT_READ_CR4,	0x004)		\
	_ER(EXIT_READ_CR8,	0x008)		\
	_ER(EXIT_WRITE_CR0,	0x010)		\
	_ER(EXIT_WRITE_CR3,	0x013)		\
	_ER(EXIT_WRITE_CR4,	0x014)		\
	_ER(EXIT_WRITE_CR8,	0x018)		\
	_ER(EXIT_READ_DR0,	0x020)		\
	_ER(EXIT_READ_DR1,	0x021)		\
	_ER(EXIT_READ_DR2,	0x022)		\
	_ER(EXIT_READ_DR3,	0x023)		\
	_ER(EXIT_READ_DR4,	0x024)		\
	_ER(EXIT_READ_DR5,	0x025)		\
	_ER(EXIT_READ_DR6,	0x026)		\
	_ER(EXIT_READ_DR7,	0x027)		\
	_ER(EXIT_WRITE_DR0,	0x030)		\
	_ER(EXIT_WRITE_DR1,	0x031)		\
	_ER(EXIT_WRITE_DR2,	0x032)		\
	_ER(EXIT_WRITE_DR3,	0x033)		\
	_ER(EXIT_WRITE_DR4,	0x034)		\
	_ER(EXIT_WRITE_DR5,	0x035)		\
	_ER(EXIT_WRITE_DR6,	0x036)		\
	_ER(EXIT_WRITE_DR7,	0x037)		\
	_ER(EXIT_EXCP_BASE,     0x040)		\
	_ER(EXIT_INTR,		0x060)		\
	_ER(EXIT_NMI,		0x061)		\
	_ER(EXIT_SMI,		0x062)		\
	_ER(EXIT_INIT,		0x063)		\
	_ER(EXIT_VINTR,		0x064)		\
	_ER(EXIT_CR0_SEL_WRITE,	0x065)		\
	_ER(EXIT_IDTR_READ,	0x066)		\
	_ER(EXIT_GDTR_READ,	0x067)		\
	_ER(EXIT_LDTR_READ,	0x068)		\
	_ER(EXIT_TR_READ,	0x069)		\
	_ER(EXIT_IDTR_WRITE,	0x06a)		\
	_ER(EXIT_GDTR_WRITE,	0x06b)		\
	_ER(EXIT_LDTR_WRITE,	0x06c)		\
	_ER(EXIT_TR_WRITE,	0x06d)		\
	_ER(EXIT_RDTSC,		0x06e)		\
	_ER(EXIT_RDPMC,		0x06f)		\
	_ER(EXIT_PUSHF,		0x070)		\
	_ER(EXIT_POPF,		0x071)		\
	_ER(EXIT_CPUID,		0x072)		\
	_ER(EXIT_RSM,		0x073)		\
	_ER(EXIT_IRET,		0x074)		\
	_ER(EXIT_SWINT,		0x075)		\
	_ER(EXIT_INVD,		0x076)		\
	_ER(EXIT_PAUSE,		0x077)		\
	_ER(EXIT_HLT,		0x078)		\
	_ER(EXIT_INVLPG,	0x079)		\
	_ER(EXIT_INVLPGA,	0x07a)		\
	_ER(EXIT_IOIO,		0x07b)		\
	_ER(EXIT_MSR,		0x07c)		\
	_ER(EXIT_TASK_SWITCH,	0x07d)		\
	_ER(EXIT_FERR_FREEZE,	0x07e)		\
	_ER(EXIT_SHUTDOWN,	0x07f)		\
	_ER(EXIT_VMRUN,		0x080)		\
	_ER(EXIT_VMMCALL,	0x081)		\
	_ER(EXIT_VMLOAD,	0x082)		\
	_ER(EXIT_VMSAVE,	0x083)		\
	_ER(EXIT_STGI,		0x084)		\
	_ER(EXIT_CLGI,		0x085)		\
	_ER(EXIT_SKINIT,	0x086)		\
	_ER(EXIT_RDTSCP,	0x087)		\
	_ER(EXIT_ICEBP,		0x088)		\
	_ER(EXIT_WBINVD,	0x089)		\
	_ER(EXIT_MONITOR,	0x08a)		\
	_ER(EXIT_MWAIT,		0x08b)		\
	_ER(EXIT_MWAIT_COND,	0x08c)		\
	_ER(EXIT_NPF,		0x400)		\
	_ER(EXIT_ERR,		-1)

#define _ER(reason, val)	{ #reason, val },
struct str_values {
	const char	*str;
	int		val;
};

static struct str_values vmx_exit_reasons[] = {
	VMX_EXIT_REASONS
	{ NULL, -1}
};

static struct str_values svm_exit_reasons[] = {
	SVM_EXIT_REASONS
	{ NULL, -1}
};

static struct isa_exit_reasons {
	unsigned isa;
	struct str_values *strings;
} isa_exit_reasons[] = {
	{ .isa = 1, .strings = vmx_exit_reasons },
	{ .isa = 2, .strings = svm_exit_reasons },
	{ }
};

static const char *find_exit_reason(unsigned isa, int val)
{
	struct str_values *strings = NULL;
	int i;

	for (i = 0; isa_exit_reasons[i].strings; ++i)
		if (isa_exit_reasons[i].isa == isa) {
			strings = isa_exit_reasons[i].strings;
			break;
		}
	if (!strings)
		return "UNKNOWN-ISA";
	for (i = 0; strings[i].val >= 0; i++)
		if (strings[i].val == val)
			break;
	if (strings[i].str)
		return strings[i].str;
	return "UNKNOWN";
}

static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
			    struct event_format *event, void *context)
{
	unsigned long long isa;
	unsigned long long val;
	unsigned long long info1 = 0, info2 = 0;

	if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
		return -1;

	if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
		isa = 1;

	trace_seq_printf(s, "reason %s", find_exit_reason(isa, val));

	pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);

	if (pevent_get_field_val(s, event, "info1", record, &info1, 0) >= 0
	    && pevent_get_field_val(s, event, "info2", record, &info2, 0) >= 0)
		trace_seq_printf(s, " info %llx %llx", info1, info2);

	return 0;
}

#define KVM_EMUL_INSN_F_CR0_PE (1 << 0)
#define KVM_EMUL_INSN_F_EFL_VM (1 << 1)
#define KVM_EMUL_INSN_F_CS_D   (1 << 2)
#define KVM_EMUL_INSN_F_CS_L   (1 << 3)

static int kvm_emulate_insn_handler(struct trace_seq *s,
				    struct pevent_record *record,
				    struct event_format *event, void *context)
{
	unsigned long long rip, csbase, len, flags, failed;
	int llen;
	uint8_t *insn;
	const char *disasm;

	if (pevent_get_field_val(s, event, "rip", record, &rip, 1) < 0)
		return -1;

	if (pevent_get_field_val(s, event, "csbase", record, &csbase, 1) < 0)
		return -1;

	if (pevent_get_field_val(s, event, "len", record, &len, 1) < 0)
		return -1;

	if (pevent_get_field_val(s, event, "flags", record, &flags, 1) < 0)
		return -1;

	if (pevent_get_field_val(s, event, "failed", record, &failed, 1) < 0)
		return -1;

	insn = pevent_get_field_raw(s, event, "insn", record, &llen, 1);
	if (!insn)
		return -1;

	disasm = disassemble(insn, len, rip,
			     flags & KVM_EMUL_INSN_F_CR0_PE,
			     flags & KVM_EMUL_INSN_F_EFL_VM,
			     flags & KVM_EMUL_INSN_F_CS_D,
			     flags & KVM_EMUL_INSN_F_CS_L);

	trace_seq_printf(s, "%llx:%llx: %s%s", csbase, rip, disasm,
			 failed ? " FAIL" : "");
	return 0;
}

union kvm_mmu_page_role {
	unsigned word;
	struct {
		unsigned glevels:4;
		unsigned level:4;
		unsigned quadrant:2;
		unsigned pad_for_nice_hex_output:6;
		unsigned direct:1;
		unsigned access:3;
		unsigned invalid:1;
		unsigned cr4_pge:1;
		unsigned nxe:1;
	};
};

static int kvm_mmu_print_role(struct trace_seq *s, struct pevent_record *record,
			      struct event_format *event, void *context)
{
	unsigned long long val;
	static const char *access_str[] = {
		"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"
	};
	union kvm_mmu_page_role role;

	if (pevent_get_field_val(s, event, "role", record, &val, 1) < 0)
		return -1;

	role.word = (int)val;

	/*
	 * We can only use the structure if file is of the same
	 * endianess.
	 */
	if (pevent_is_file_bigendian(event->pevent) ==
	    pevent_is_host_bigendian(event->pevent)) {

		trace_seq_printf(s, "%u/%u q%u%s %s%s %spge %snxe",
				 role.level,
				 role.glevels,
				 role.quadrant,
				 role.direct ? " direct" : "",
				 access_str[role.access],
				 role.invalid ? " invalid" : "",
				 role.cr4_pge ? "" : "!",
				 role.nxe ? "" : "!");
	} else
		trace_seq_printf(s, "WORD: %08x", role.word);

	pevent_print_num_field(s, " root %u ",  event,
			       "root_count", record, 1);

	if (pevent_get_field_val(s, event, "unsync", record, &val, 1) < 0)
		return -1;

	trace_seq_printf(s, "%s%c",  val ? "unsync" : "sync", 0);
	return 0;
}

static int kvm_mmu_get_page_handler(struct trace_seq *s,
				    struct pevent_record *record,
				    struct event_format *event, void *context)
{
	unsigned long long val;

	if (pevent_get_field_val(s, event, "created", record, &val, 1) < 0)
		return -1;

	trace_seq_printf(s, "%s ", val ? "new" : "existing");

	if (pevent_get_field_val(s, event, "gfn", record, &val, 1) < 0)
		return -1;

	trace_seq_printf(s, "sp gfn %llx ", val);
	return kvm_mmu_print_role(s, record, event, context);
}

#define PT_WRITABLE_SHIFT 1
#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)

static unsigned long long
process_is_writable_pte(struct trace_seq *s, unsigned long long *args)
{
	unsigned long pte = args[0];
	return pte & PT_WRITABLE_MASK;
}

int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
{
	init_disassembler();

	pevent_register_event_handler(pevent, -1, "kvm", "kvm_exit",
				      kvm_exit_handler, NULL);

	pevent_register_event_handler(pevent, -1, "kvm", "kvm_emulate_insn",
				      kvm_emulate_insn_handler, NULL);

	pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_get_page",
				      kvm_mmu_get_page_handler, NULL);

	pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_sync_page",
				      kvm_mmu_print_role, NULL);

	pevent_register_event_handler(pevent, -1,
				      "kvmmmu", "kvm_mmu_unsync_page",
				      kvm_mmu_print_role, NULL);

	pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
				      kvm_mmu_print_role, NULL);

	pevent_register_event_handler(pevent, -1, "kvmmmu",
			"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
			NULL);

	pevent_register_print_function(pevent,
				       process_is_writable_pte,
				       PEVENT_FUNC_ARG_INT,
				       "is_writable_pte",
				       PEVENT_FUNC_ARG_LONG,
				       PEVENT_FUNC_ARG_VOID);
	return 0;
}
OpenPOWER on IntegriCloud