Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation;
8 * version 2.1 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this program; if not, see <http://www.gnu.org/licenses>
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <stdint.h>
24
25#include "event-parse.h"
26
27#ifdef HAVE_UDIS86
28
29#include <udis86.h>
30
31static ud_t ud;
32
33static void init_disassembler(void)
34{
35 ud_init(&ud);
36 ud_set_syntax(&ud, UD_SYN_ATT);
37}
38
39static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
40 int cr0_pe, int eflags_vm,
41 int cs_d, int cs_l)
42{
43 int mode;
44
45 if (!cr0_pe)
46 mode = 16;
47 else if (eflags_vm)
48 mode = 16;
49 else if (cs_l)
50 mode = 64;
51 else if (cs_d)
52 mode = 32;
53 else
54 mode = 16;
55
56 ud_set_pc(&ud, rip);
57 ud_set_mode(&ud, mode);
58 ud_set_input_buffer(&ud, insn, len);
59 ud_disassemble(&ud);
60 return ud_insn_asm(&ud);
61}
62
63#else
64
65static void init_disassembler(void)
66{
67}
68
69static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
70 int cr0_pe, int eflags_vm,
71 int cs_d, int cs_l)
72{
73 static char out[15*3+1];
74 int i;
75
76 for (i = 0; i < len; ++i)
77 sprintf(out + i * 3, "%02x ", insn[i]);
78 out[len*3-1] = '\0';
79 return out;
80}
81
82#endif
83
84
85#define VMX_EXIT_REASONS \
86 _ER(EXCEPTION_NMI, 0) \
87 _ER(EXTERNAL_INTERRUPT, 1) \
88 _ER(TRIPLE_FAULT, 2) \
89 _ER(PENDING_INTERRUPT, 7) \
90 _ER(NMI_WINDOW, 8) \
91 _ER(TASK_SWITCH, 9) \
92 _ER(CPUID, 10) \
93 _ER(HLT, 12) \
94 _ER(INVD, 13) \
95 _ER(INVLPG, 14) \
96 _ER(RDPMC, 15) \
97 _ER(RDTSC, 16) \
98 _ER(VMCALL, 18) \
99 _ER(VMCLEAR, 19) \
100 _ER(VMLAUNCH, 20) \
101 _ER(VMPTRLD, 21) \
102 _ER(VMPTRST, 22) \
103 _ER(VMREAD, 23) \
104 _ER(VMRESUME, 24) \
105 _ER(VMWRITE, 25) \
106 _ER(VMOFF, 26) \
107 _ER(VMON, 27) \
108 _ER(CR_ACCESS, 28) \
109 _ER(DR_ACCESS, 29) \
110 _ER(IO_INSTRUCTION, 30) \
111 _ER(MSR_READ, 31) \
112 _ER(MSR_WRITE, 32) \
113 _ER(MWAIT_INSTRUCTION, 36) \
114 _ER(MONITOR_INSTRUCTION, 39) \
115 _ER(PAUSE_INSTRUCTION, 40) \
116 _ER(MCE_DURING_VMENTRY, 41) \
117 _ER(TPR_BELOW_THRESHOLD, 43) \
118 _ER(APIC_ACCESS, 44) \
119 _ER(EOI_INDUCED, 45) \
120 _ER(EPT_VIOLATION, 48) \
121 _ER(EPT_MISCONFIG, 49) \
122 _ER(INVEPT, 50) \
123 _ER(PREEMPTION_TIMER, 52) \
124 _ER(WBINVD, 54) \
125 _ER(XSETBV, 55) \
126 _ER(APIC_WRITE, 56) \
127 _ER(INVPCID, 58)
128
129#define SVM_EXIT_REASONS \
130 _ER(EXIT_READ_CR0, 0x000) \
131 _ER(EXIT_READ_CR3, 0x003) \
132 _ER(EXIT_READ_CR4, 0x004) \
133 _ER(EXIT_READ_CR8, 0x008) \
134 _ER(EXIT_WRITE_CR0, 0x010) \
135 _ER(EXIT_WRITE_CR3, 0x013) \
136 _ER(EXIT_WRITE_CR4, 0x014) \
137 _ER(EXIT_WRITE_CR8, 0x018) \
138 _ER(EXIT_READ_DR0, 0x020) \
139 _ER(EXIT_READ_DR1, 0x021) \
140 _ER(EXIT_READ_DR2, 0x022) \
141 _ER(EXIT_READ_DR3, 0x023) \
142 _ER(EXIT_READ_DR4, 0x024) \
143 _ER(EXIT_READ_DR5, 0x025) \
144 _ER(EXIT_READ_DR6, 0x026) \
145 _ER(EXIT_READ_DR7, 0x027) \
146 _ER(EXIT_WRITE_DR0, 0x030) \
147 _ER(EXIT_WRITE_DR1, 0x031) \
148 _ER(EXIT_WRITE_DR2, 0x032) \
149 _ER(EXIT_WRITE_DR3, 0x033) \
150 _ER(EXIT_WRITE_DR4, 0x034) \
151 _ER(EXIT_WRITE_DR5, 0x035) \
152 _ER(EXIT_WRITE_DR6, 0x036) \
153 _ER(EXIT_WRITE_DR7, 0x037) \
154 _ER(EXIT_EXCP_BASE, 0x040) \
155 _ER(EXIT_INTR, 0x060) \
156 _ER(EXIT_NMI, 0x061) \
157 _ER(EXIT_SMI, 0x062) \
158 _ER(EXIT_INIT, 0x063) \
159 _ER(EXIT_VINTR, 0x064) \
160 _ER(EXIT_CR0_SEL_WRITE, 0x065) \
161 _ER(EXIT_IDTR_READ, 0x066) \
162 _ER(EXIT_GDTR_READ, 0x067) \
163 _ER(EXIT_LDTR_READ, 0x068) \
164 _ER(EXIT_TR_READ, 0x069) \
165 _ER(EXIT_IDTR_WRITE, 0x06a) \
166 _ER(EXIT_GDTR_WRITE, 0x06b) \
167 _ER(EXIT_LDTR_WRITE, 0x06c) \
168 _ER(EXIT_TR_WRITE, 0x06d) \
169 _ER(EXIT_RDTSC, 0x06e) \
170 _ER(EXIT_RDPMC, 0x06f) \
171 _ER(EXIT_PUSHF, 0x070) \
172 _ER(EXIT_POPF, 0x071) \
173 _ER(EXIT_CPUID, 0x072) \
174 _ER(EXIT_RSM, 0x073) \
175 _ER(EXIT_IRET, 0x074) \
176 _ER(EXIT_SWINT, 0x075) \
177 _ER(EXIT_INVD, 0x076) \
178 _ER(EXIT_PAUSE, 0x077) \
179 _ER(EXIT_HLT, 0x078) \
180 _ER(EXIT_INVLPG, 0x079) \
181 _ER(EXIT_INVLPGA, 0x07a) \
182 _ER(EXIT_IOIO, 0x07b) \
183 _ER(EXIT_MSR, 0x07c) \
184 _ER(EXIT_TASK_SWITCH, 0x07d) \
185 _ER(EXIT_FERR_FREEZE, 0x07e) \
186 _ER(EXIT_SHUTDOWN, 0x07f) \
187 _ER(EXIT_VMRUN, 0x080) \
188 _ER(EXIT_VMMCALL, 0x081) \
189 _ER(EXIT_VMLOAD, 0x082) \
190 _ER(EXIT_VMSAVE, 0x083) \
191 _ER(EXIT_STGI, 0x084) \
192 _ER(EXIT_CLGI, 0x085) \
193 _ER(EXIT_SKINIT, 0x086) \
194 _ER(EXIT_RDTSCP, 0x087) \
195 _ER(EXIT_ICEBP, 0x088) \
196 _ER(EXIT_WBINVD, 0x089) \
197 _ER(EXIT_MONITOR, 0x08a) \
198 _ER(EXIT_MWAIT, 0x08b) \
199 _ER(EXIT_MWAIT_COND, 0x08c) \
200 _ER(EXIT_NPF, 0x400) \
201 _ER(EXIT_ERR, -1)
202
203#define _ER(reason, val) { #reason, val },
204struct str_values {
205 const char *str;
206 int val;
207};
208
209static struct str_values vmx_exit_reasons[] = {
210 VMX_EXIT_REASONS
211 { NULL, -1}
212};
213
214static struct str_values svm_exit_reasons[] = {
215 SVM_EXIT_REASONS
216 { NULL, -1}
217};
218
219static struct isa_exit_reasons {
220 unsigned isa;
221 struct str_values *strings;
222} isa_exit_reasons[] = {
223 { .isa = 1, .strings = vmx_exit_reasons },
224 { .isa = 2, .strings = svm_exit_reasons },
225 { }
226};
227
228static const char *find_exit_reason(unsigned isa, int val)
229{
230 struct str_values *strings = NULL;
231 int i;
232
233 for (i = 0; isa_exit_reasons[i].strings; ++i)
234 if (isa_exit_reasons[i].isa == isa) {
235 strings = isa_exit_reasons[i].strings;
236 break;
237 }
238 if (!strings)
239 return "UNKNOWN-ISA";
240 for (i = 0; strings[i].val >= 0; i++)
241 if (strings[i].val == val)
242 break;
243 if (strings[i].str)
244 return strings[i].str;
245 return "UNKNOWN";
246}
247
248static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
249 struct event_format *event, void *context)
250{
251 unsigned long long isa;
252 unsigned long long val;
253 unsigned long long info1 = 0, info2 = 0;
254
255 if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
256 return -1;
257
258 if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
259 isa = 1;
260
261 trace_seq_printf(s, "reason %s", find_exit_reason(isa, val));
262
263 pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);
264
265 if (pevent_get_field_val(s, event, "info1", record, &info1, 0) >= 0
266 && pevent_get_field_val(s, event, "info2", record, &info2, 0) >= 0)
267 trace_seq_printf(s, " info %llx %llx", info1, info2);
268
269 return 0;
270}
271
272#define KVM_EMUL_INSN_F_CR0_PE (1 << 0)
273#define KVM_EMUL_INSN_F_EFL_VM (1 << 1)
274#define KVM_EMUL_INSN_F_CS_D (1 << 2)
275#define KVM_EMUL_INSN_F_CS_L (1 << 3)
276
277static int kvm_emulate_insn_handler(struct trace_seq *s,
278 struct pevent_record *record,
279 struct event_format *event, void *context)
280{
281 unsigned long long rip, csbase, len, flags, failed;
282 int llen;
283 uint8_t *insn;
284 const char *disasm;
285
286 if (pevent_get_field_val(s, event, "rip", record, &rip, 1) < 0)
287 return -1;
288
289 if (pevent_get_field_val(s, event, "csbase", record, &csbase, 1) < 0)
290 return -1;
291
292 if (pevent_get_field_val(s, event, "len", record, &len, 1) < 0)
293 return -1;
294
295 if (pevent_get_field_val(s, event, "flags", record, &flags, 1) < 0)
296 return -1;
297
298 if (pevent_get_field_val(s, event, "failed", record, &failed, 1) < 0)
299 return -1;
300
301 insn = pevent_get_field_raw(s, event, "insn", record, &llen, 1);
302 if (!insn)
303 return -1;
304
305 disasm = disassemble(insn, len, rip,
306 flags & KVM_EMUL_INSN_F_CR0_PE,
307 flags & KVM_EMUL_INSN_F_EFL_VM,
308 flags & KVM_EMUL_INSN_F_CS_D,
309 flags & KVM_EMUL_INSN_F_CS_L);
310
311 trace_seq_printf(s, "%llx:%llx: %s%s", csbase, rip, disasm,
312 failed ? " FAIL" : "");
313 return 0;
314}
315
316union kvm_mmu_page_role {
317 unsigned word;
318 struct {
319 unsigned glevels:4;
320 unsigned level:4;
321 unsigned quadrant:2;
322 unsigned pad_for_nice_hex_output:6;
323 unsigned direct:1;
324 unsigned access:3;
325 unsigned invalid:1;
326 unsigned cr4_pge:1;
327 unsigned nxe:1;
328 };
329};
330
331static int kvm_mmu_print_role(struct trace_seq *s, struct pevent_record *record,
332 struct event_format *event, void *context)
333{
334 unsigned long long val;
335 static const char *access_str[] = {
336 "---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"
337 };
338 union kvm_mmu_page_role role;
339
340 if (pevent_get_field_val(s, event, "role", record, &val, 1) < 0)
341 return -1;
342
343 role.word = (int)val;
344
345 /*
346 * We can only use the structure if file is of the same
347 * endianess.
348 */
349 if (pevent_is_file_bigendian(event->pevent) ==
350 pevent_is_host_bigendian(event->pevent)) {
351
352 trace_seq_printf(s, "%u/%u q%u%s %s%s %spge %snxe",
353 role.level,
354 role.glevels,
355 role.quadrant,
356 role.direct ? " direct" : "",
357 access_str[role.access],
358 role.invalid ? " invalid" : "",
359 role.cr4_pge ? "" : "!",
360 role.nxe ? "" : "!");
361 } else
362 trace_seq_printf(s, "WORD: %08x", role.word);
363
364 pevent_print_num_field(s, " root %u ", event,
365 "root_count", record, 1);
366
367 if (pevent_get_field_val(s, event, "unsync", record, &val, 1) < 0)
368 return -1;
369
370 trace_seq_printf(s, "%s%c", val ? "unsync" : "sync", 0);
371 return 0;
372}
373
374static int kvm_mmu_get_page_handler(struct trace_seq *s,
375 struct pevent_record *record,
376 struct event_format *event, void *context)
377{
378 unsigned long long val;
379
380 if (pevent_get_field_val(s, event, "created", record, &val, 1) < 0)
381 return -1;
382
383 trace_seq_printf(s, "%s ", val ? "new" : "existing");
384
385 if (pevent_get_field_val(s, event, "gfn", record, &val, 1) < 0)
386 return -1;
387
388 trace_seq_printf(s, "sp gfn %llx ", val);
389 return kvm_mmu_print_role(s, record, event, context);
390}
391
392#define PT_WRITABLE_SHIFT 1
393#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
394
395static unsigned long long
396process_is_writable_pte(struct trace_seq *s, unsigned long long *args)
397{
398 unsigned long pte = args[0];
399 return pte & PT_WRITABLE_MASK;
400}
401
402int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
403{
404 init_disassembler();
405
406 pevent_register_event_handler(pevent, -1, "kvm", "kvm_exit",
407 kvm_exit_handler, NULL);
408
409 pevent_register_event_handler(pevent, -1, "kvm", "kvm_emulate_insn",
410 kvm_emulate_insn_handler, NULL);
411
412 pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_get_page",
413 kvm_mmu_get_page_handler, NULL);
414
415 pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_sync_page",
416 kvm_mmu_print_role, NULL);
417
418 pevent_register_event_handler(pevent, -1,
419 "kvmmmu", "kvm_mmu_unsync_page",
420 kvm_mmu_print_role, NULL);
421
422 pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
423 kvm_mmu_print_role, NULL);
424
425 pevent_register_event_handler(pevent, -1, "kvmmmu",
426 "kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
427 NULL);
428
429 pevent_register_print_function(pevent,
430 process_is_writable_pte,
431 PEVENT_FUNC_ARG_INT,
432 "is_writable_pte",
433 PEVENT_FUNC_ARG_LONG,
434 PEVENT_FUNC_ARG_VOID);
435 return 0;
436}
437
438void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
439{
440 pevent_unregister_event_handler(pevent, -1, "kvm", "kvm_exit",
441 kvm_exit_handler, NULL);
442
443 pevent_unregister_event_handler(pevent, -1, "kvm", "kvm_emulate_insn",
444 kvm_emulate_insn_handler, NULL);
445
446 pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_get_page",
447 kvm_mmu_get_page_handler, NULL);
448
449 pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_sync_page",
450 kvm_mmu_print_role, NULL);
451
452 pevent_unregister_event_handler(pevent, -1,
453 "kvmmmu", "kvm_mmu_unsync_page",
454 kvm_mmu_print_role, NULL);
455
456 pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
457 kvm_mmu_print_role, NULL);
458
459 pevent_unregister_event_handler(pevent, -1, "kvmmmu",
460 "kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
461 NULL);
462
463 pevent_unregister_print_function(pevent, process_is_writable_pte,
464 "is_writable_pte");
465}