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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* svm_vmcall_test
*
* Copyright © 2021 Amazon.com, Inc. or its affiliates.
*
* Xen shared_info / pvclock testing
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include <stdint.h>
#include <time.h>
#include <sched.h>
#include <signal.h>
#include <pthread.h>
#include <sys/eventfd.h>
#define SHINFO_REGION_GVA 0xc0000000ULL
#define SHINFO_REGION_GPA 0xc0000000ULL
#define SHINFO_REGION_SLOT 10
#define DUMMY_REGION_GPA (SHINFO_REGION_GPA + (3 * PAGE_SIZE))
#define DUMMY_REGION_SLOT 11
#define DUMMY_REGION_GPA_2 (SHINFO_REGION_GPA + (4 * PAGE_SIZE))
#define DUMMY_REGION_SLOT_2 12
#define SHINFO_ADDR (SHINFO_REGION_GPA)
#define VCPU_INFO_ADDR (SHINFO_REGION_GPA + 0x40)
#define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE)
#define RUNSTATE_ADDR (SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE - 15)
#define SHINFO_VADDR (SHINFO_REGION_GVA)
#define VCPU_INFO_VADDR (SHINFO_REGION_GVA + 0x40)
#define RUNSTATE_VADDR (SHINFO_REGION_GVA + PAGE_SIZE + PAGE_SIZE - 15)
#define EVTCHN_VECTOR 0x10
#define EVTCHN_TEST1 15
#define EVTCHN_TEST2 66
#define EVTCHN_TIMER 13
enum {
TEST_INJECT_VECTOR = 0,
TEST_RUNSTATE_runnable,
TEST_RUNSTATE_blocked,
TEST_RUNSTATE_offline,
TEST_RUNSTATE_ADJUST,
TEST_RUNSTATE_DATA,
TEST_STEAL_TIME,
TEST_EVTCHN_MASKED,
TEST_EVTCHN_UNMASKED,
TEST_EVTCHN_SLOWPATH,
TEST_EVTCHN_SEND_IOCTL,
TEST_EVTCHN_HCALL,
TEST_EVTCHN_HCALL_SLOWPATH,
TEST_EVTCHN_HCALL_EVENTFD,
TEST_TIMER_SETUP,
TEST_TIMER_WAIT,
TEST_TIMER_RESTORE,
TEST_POLL_READY,
TEST_POLL_TIMEOUT,
TEST_POLL_MASKED,
TEST_POLL_WAKE,
TEST_TIMER_PAST,
TEST_LOCKING_SEND_RACE,
TEST_LOCKING_POLL_RACE,
TEST_LOCKING_POLL_TIMEOUT,
TEST_DONE,
TEST_GUEST_SAW_IRQ,
};
#define XEN_HYPERCALL_MSR 0x40000000
#define MIN_STEAL_TIME 50000
#define SHINFO_RACE_TIMEOUT 2 /* seconds */
#define __HYPERVISOR_set_timer_op 15
#define __HYPERVISOR_sched_op 29
#define __HYPERVISOR_event_channel_op 32
#define SCHEDOP_poll 3
#define EVTCHNOP_send 4
#define EVTCHNSTAT_interdomain 2
struct evtchn_send {
u32 port;
};
struct sched_poll {
u32 *ports;
unsigned int nr_ports;
u64 timeout;
};
struct pvclock_vcpu_time_info {
u32 version;
u32 pad0;
u64 tsc_timestamp;
u64 system_time;
u32 tsc_to_system_mul;
s8 tsc_shift;
u8 flags;
u8 pad[2];
} __attribute__((__packed__)); /* 32 bytes */
struct pvclock_wall_clock {
u32 version;
u32 sec;
u32 nsec;
} __attribute__((__packed__));
struct vcpu_runstate_info {
uint32_t state;
uint64_t state_entry_time;
uint64_t time[5]; /* Extra field for overrun check */
};
struct compat_vcpu_runstate_info {
uint32_t state;
uint64_t state_entry_time;
uint64_t time[5];
} __attribute__((__packed__));;
struct arch_vcpu_info {
unsigned long cr2;
unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
};
struct vcpu_info {
uint8_t evtchn_upcall_pending;
uint8_t evtchn_upcall_mask;
unsigned long evtchn_pending_sel;
struct arch_vcpu_info arch;
struct pvclock_vcpu_time_info time;
}; /* 64 bytes (x86) */
struct shared_info {
struct vcpu_info vcpu_info[32];
unsigned long evtchn_pending[64];
unsigned long evtchn_mask[64];
struct pvclock_wall_clock wc;
uint32_t wc_sec_hi;
/* arch_shared_info here */
};
#define RUNSTATE_running 0
#define RUNSTATE_runnable 1
#define RUNSTATE_blocked 2
#define RUNSTATE_offline 3
static const char *runstate_names[] = {
"running",
"runnable",
"blocked",
"offline"
};
struct {
struct kvm_irq_routing info;
struct kvm_irq_routing_entry entries[2];
} irq_routes;
static volatile bool guest_saw_irq;
static void evtchn_handler(struct ex_regs *regs)
{
struct vcpu_info *vi = (void *)VCPU_INFO_VADDR;
vi->evtchn_upcall_pending = 0;
vi->evtchn_pending_sel = 0;
guest_saw_irq = true;
GUEST_SYNC(TEST_GUEST_SAW_IRQ);
}
static void guest_wait_for_irq(void)
{
while (!guest_saw_irq)
__asm__ __volatile__ ("rep nop" : : : "memory");
guest_saw_irq = false;
}
static void guest_code(void)
{
struct vcpu_runstate_info *rs = (void *)RUNSTATE_VADDR;
int i;
__asm__ __volatile__(
"sti\n"
"nop\n"
);
/* Trigger an interrupt injection */
GUEST_SYNC(TEST_INJECT_VECTOR);
guest_wait_for_irq();
/* Test having the host set runstates manually */
GUEST_SYNC(TEST_RUNSTATE_runnable);
GUEST_ASSERT(rs->time[RUNSTATE_runnable] != 0);
GUEST_ASSERT(rs->state == 0);
GUEST_SYNC(TEST_RUNSTATE_blocked);
GUEST_ASSERT(rs->time[RUNSTATE_blocked] != 0);
GUEST_ASSERT(rs->state == 0);
GUEST_SYNC(TEST_RUNSTATE_offline);
GUEST_ASSERT(rs->time[RUNSTATE_offline] != 0);
GUEST_ASSERT(rs->state == 0);
/* Test runstate time adjust */
GUEST_SYNC(TEST_RUNSTATE_ADJUST);
GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x5a);
GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x6b6b);
/* Test runstate time set */
GUEST_SYNC(TEST_RUNSTATE_DATA);
GUEST_ASSERT(rs->state_entry_time >= 0x8000);
GUEST_ASSERT(rs->time[RUNSTATE_runnable] == 0);
GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x6b6b);
GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x5a);
/* sched_yield() should result in some 'runnable' time */
GUEST_SYNC(TEST_STEAL_TIME);
GUEST_ASSERT(rs->time[RUNSTATE_runnable] >= MIN_STEAL_TIME);
/* Attempt to deliver a *masked* interrupt */
GUEST_SYNC(TEST_EVTCHN_MASKED);
/* Wait until we see the bit set */
struct shared_info *si = (void *)SHINFO_VADDR;
while (!si->evtchn_pending[0])
__asm__ __volatile__ ("rep nop" : : : "memory");
/* Now deliver an *unmasked* interrupt */
GUEST_SYNC(TEST_EVTCHN_UNMASKED);
guest_wait_for_irq();
/* Change memslots and deliver an interrupt */
GUEST_SYNC(TEST_EVTCHN_SLOWPATH);
guest_wait_for_irq();
/* Deliver event channel with KVM_XEN_HVM_EVTCHN_SEND */
GUEST_SYNC(TEST_EVTCHN_SEND_IOCTL);
guest_wait_for_irq();
GUEST_SYNC(TEST_EVTCHN_HCALL);
/* Our turn. Deliver event channel (to ourselves) with
* EVTCHNOP_send hypercall. */
struct evtchn_send s = { .port = 127 };
xen_hypercall(__HYPERVISOR_event_channel_op, EVTCHNOP_send, &s);
guest_wait_for_irq();
GUEST_SYNC(TEST_EVTCHN_HCALL_SLOWPATH);
/*
* Same again, but this time the host has messed with memslots so it
* should take the slow path in kvm_xen_set_evtchn().
*/
xen_hypercall(__HYPERVISOR_event_channel_op, EVTCHNOP_send, &s);
guest_wait_for_irq();
GUEST_SYNC(TEST_EVTCHN_HCALL_EVENTFD);
/* Deliver "outbound" event channel to an eventfd which
* happens to be one of our own irqfds. */
s.port = 197;
xen_hypercall(__HYPERVISOR_event_channel_op, EVTCHNOP_send, &s);
guest_wait_for_irq();
GUEST_SYNC(TEST_TIMER_SETUP);
/* Set a timer 100ms in the future. */
xen_hypercall(__HYPERVISOR_set_timer_op,
rs->state_entry_time + 100000000, NULL);
GUEST_SYNC(TEST_TIMER_WAIT);
/* Now wait for the timer */
guest_wait_for_irq();
GUEST_SYNC(TEST_TIMER_RESTORE);
/* The host has 'restored' the timer. Just wait for it. */
guest_wait_for_irq();
GUEST_SYNC(TEST_POLL_READY);
/* Poll for an event channel port which is already set */
u32 ports[1] = { EVTCHN_TIMER };
struct sched_poll p = {
.ports = ports,
.nr_ports = 1,
.timeout = 0,
};
xen_hypercall(__HYPERVISOR_sched_op, SCHEDOP_poll, &p);
GUEST_SYNC(TEST_POLL_TIMEOUT);
/* Poll for an unset port and wait for the timeout. */
p.timeout = 100000000;
xen_hypercall(__HYPERVISOR_sched_op, SCHEDOP_poll, &p);
GUEST_SYNC(TEST_POLL_MASKED);
/* A timer will wake the masked port we're waiting on, while we poll */
p.timeout = 0;
xen_hypercall(__HYPERVISOR_sched_op, SCHEDOP_poll, &p);
GUEST_SYNC(TEST_POLL_WAKE);
/* A timer wake an *unmasked* port which should wake us with an
* actual interrupt, while we're polling on a different port. */
ports[0]++;
p.timeout = 0;
xen_hypercall(__HYPERVISOR_sched_op, SCHEDOP_poll, &p);
guest_wait_for_irq();
GUEST_SYNC(TEST_TIMER_PAST);
/* Timer should have fired already */
guest_wait_for_irq();
GUEST_SYNC(TEST_LOCKING_SEND_RACE);
/* Racing host ioctls */
guest_wait_for_irq();
GUEST_SYNC(TEST_LOCKING_POLL_RACE);
/* Racing vmcall against host ioctl */
ports[0] = 0;
p = (struct sched_poll) {
.ports = ports,
.nr_ports = 1,
.timeout = 0
};
wait_for_timer:
/*
* Poll for a timer wake event while the worker thread is mucking with
* the shared info. KVM XEN drops timer IRQs if the shared info is
* invalid when the timer expires. Arbitrarily poll 100 times before
* giving up and asking the VMM to re-arm the timer. 100 polls should
* consume enough time to beat on KVM without taking too long if the
* timer IRQ is dropped due to an invalid event channel.
*/
for (i = 0; i < 100 && !guest_saw_irq; i++)
__xen_hypercall(__HYPERVISOR_sched_op, SCHEDOP_poll, &p);
/*
* Re-send the timer IRQ if it was (likely) dropped due to the timer
* expiring while the event channel was invalid.
*/
if (!guest_saw_irq) {
GUEST_SYNC(TEST_LOCKING_POLL_TIMEOUT);
goto wait_for_timer;
}
guest_saw_irq = false;
GUEST_SYNC(TEST_DONE);
}
static int cmp_timespec(struct timespec *a, struct timespec *b)
{
if (a->tv_sec > b->tv_sec)
return 1;
else if (a->tv_sec < b->tv_sec)
return -1;
else if (a->tv_nsec > b->tv_nsec)
return 1;
else if (a->tv_nsec < b->tv_nsec)
return -1;
else
return 0;
}
static struct vcpu_info *vinfo;
static struct kvm_vcpu *vcpu;
static void handle_alrm(int sig)
{
if (vinfo)
printf("evtchn_upcall_pending 0x%x\n", vinfo->evtchn_upcall_pending);
vcpu_dump(stdout, vcpu, 0);
TEST_FAIL("IRQ delivery timed out");
}
static void *juggle_shinfo_state(void *arg)
{
struct kvm_vm *vm = (struct kvm_vm *)arg;
struct kvm_xen_hvm_attr cache_activate = {
.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
.u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE
};
struct kvm_xen_hvm_attr cache_deactivate = {
.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
.u.shared_info.gfn = KVM_XEN_INVALID_GFN
};
for (;;) {
__vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &cache_activate);
__vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &cache_deactivate);
pthread_testcancel();
}
return NULL;
}
int main(int argc, char *argv[])
{
struct timespec min_ts, max_ts, vm_ts;
struct kvm_xen_hvm_attr evt_reset;
struct kvm_vm *vm;
pthread_t thread;
bool verbose;
int ret;
verbose = argc > 1 && (!strncmp(argv[1], "-v", 3) ||
!strncmp(argv[1], "--verbose", 10));
int xen_caps = kvm_check_cap(KVM_CAP_XEN_HVM);
TEST_REQUIRE(xen_caps & KVM_XEN_HVM_CONFIG_SHARED_INFO);
bool do_runstate_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE);
bool do_runstate_flag = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG);
bool do_eventfd_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL);
bool do_evtchn_tests = do_eventfd_tests && !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND);
clock_gettime(CLOCK_REALTIME, &min_ts);
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
/* Map a region for the shared_info page */
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 3, 0);
virt_map(vm, SHINFO_REGION_GVA, SHINFO_REGION_GPA, 3);
struct shared_info *shinfo = addr_gpa2hva(vm, SHINFO_VADDR);
int zero_fd = open("/dev/zero", O_RDONLY);
TEST_ASSERT(zero_fd != -1, "Failed to open /dev/zero");
struct kvm_xen_hvm_config hvmc = {
.flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL,
.msr = XEN_HYPERCALL_MSR,
};
/* Let the kernel know that we *will* use it for sending all
* event channels, which lets it intercept SCHEDOP_poll */
if (do_evtchn_tests)
hvmc.flags |= KVM_XEN_HVM_CONFIG_EVTCHN_SEND;
vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc);
struct kvm_xen_hvm_attr lm = {
.type = KVM_XEN_ATTR_TYPE_LONG_MODE,
.u.long_mode = 1,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm);
if (do_runstate_flag) {
struct kvm_xen_hvm_attr ruf = {
.type = KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG,
.u.runstate_update_flag = 1,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ruf);
ruf.u.runstate_update_flag = 0;
vm_ioctl(vm, KVM_XEN_HVM_GET_ATTR, &ruf);
TEST_ASSERT(ruf.u.runstate_update_flag == 1,
"Failed to read back RUNSTATE_UPDATE_FLAG attr");
}
struct kvm_xen_hvm_attr ha = {
.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
.u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ha);
/*
* Test what happens when the HVA of the shinfo page is remapped after
* the kernel has a reference to it. But make sure we copy the clock
* info over since that's only set at setup time, and we test it later.
*/
struct pvclock_wall_clock wc_copy = shinfo->wc;
void *m = mmap(shinfo, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE, zero_fd, 0);
TEST_ASSERT(m == shinfo, "Failed to map /dev/zero over shared info");
shinfo->wc = wc_copy;
struct kvm_xen_vcpu_attr vi = {
.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO,
.u.gpa = VCPU_INFO_ADDR,
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vi);
struct kvm_xen_vcpu_attr pvclock = {
.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO,
.u.gpa = PVTIME_ADDR,
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &pvclock);
struct kvm_xen_hvm_attr vec = {
.type = KVM_XEN_ATTR_TYPE_UPCALL_VECTOR,
.u.vector = EVTCHN_VECTOR,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &vec);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
vm_install_exception_handler(vm, EVTCHN_VECTOR, evtchn_handler);
if (do_runstate_tests) {
struct kvm_xen_vcpu_attr st = {
.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR,
.u.gpa = RUNSTATE_ADDR,
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &st);
}
int irq_fd[2] = { -1, -1 };
if (do_eventfd_tests) {
irq_fd[0] = eventfd(0, 0);
irq_fd[1] = eventfd(0, 0);
/* Unexpected, but not a KVM failure */
if (irq_fd[0] == -1 || irq_fd[1] == -1)
do_evtchn_tests = do_eventfd_tests = false;
}
if (do_eventfd_tests) {
irq_routes.info.nr = 2;
irq_routes.entries[0].gsi = 32;
irq_routes.entries[0].type = KVM_IRQ_ROUTING_XEN_EVTCHN;
irq_routes.entries[0].u.xen_evtchn.port = EVTCHN_TEST1;
irq_routes.entries[0].u.xen_evtchn.vcpu = vcpu->id;
irq_routes.entries[0].u.xen_evtchn.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
irq_routes.entries[1].gsi = 33;
irq_routes.entries[1].type = KVM_IRQ_ROUTING_XEN_EVTCHN;
irq_routes.entries[1].u.xen_evtchn.port = EVTCHN_TEST2;
irq_routes.entries[1].u.xen_evtchn.vcpu = vcpu->id;
irq_routes.entries[1].u.xen_evtchn.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
vm_ioctl(vm, KVM_SET_GSI_ROUTING, &irq_routes.info);
struct kvm_irqfd ifd = { };
ifd.fd = irq_fd[0];
ifd.gsi = 32;
vm_ioctl(vm, KVM_IRQFD, &ifd);
ifd.fd = irq_fd[1];
ifd.gsi = 33;
vm_ioctl(vm, KVM_IRQFD, &ifd);
struct sigaction sa = { };
sa.sa_handler = handle_alrm;
sigaction(SIGALRM, &sa, NULL);
}
struct kvm_xen_vcpu_attr tmr = {
.type = KVM_XEN_VCPU_ATTR_TYPE_TIMER,
.u.timer.port = EVTCHN_TIMER,
.u.timer.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL,
.u.timer.expires_ns = 0
};
if (do_evtchn_tests) {
struct kvm_xen_hvm_attr inj = {
.type = KVM_XEN_ATTR_TYPE_EVTCHN,
.u.evtchn.send_port = 127,
.u.evtchn.type = EVTCHNSTAT_interdomain,
.u.evtchn.flags = 0,
.u.evtchn.deliver.port.port = EVTCHN_TEST1,
.u.evtchn.deliver.port.vcpu = vcpu->id + 1,
.u.evtchn.deliver.port.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj);
/* Test migration to a different vCPU */
inj.u.evtchn.flags = KVM_XEN_EVTCHN_UPDATE;
inj.u.evtchn.deliver.port.vcpu = vcpu->id;
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj);
inj.u.evtchn.send_port = 197;
inj.u.evtchn.deliver.eventfd.port = 0;
inj.u.evtchn.deliver.eventfd.fd = irq_fd[1];
inj.u.evtchn.flags = 0;
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &inj);
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
}
vinfo = addr_gpa2hva(vm, VCPU_INFO_VADDR);
vinfo->evtchn_upcall_pending = 0;
struct vcpu_runstate_info *rs = addr_gpa2hva(vm, RUNSTATE_ADDR);
rs->state = 0x5a;
bool evtchn_irq_expected = false;
for (;;) {
volatile struct kvm_run *run = vcpu->run;
struct ucall uc;
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
/* NOT REACHED */
case UCALL_SYNC: {
struct kvm_xen_vcpu_attr rst;
long rundelay;
if (do_runstate_tests)
TEST_ASSERT(rs->state_entry_time == rs->time[0] +
rs->time[1] + rs->time[2] + rs->time[3],
"runstate times don't add up");
switch (uc.args[1]) {
case TEST_INJECT_VECTOR:
if (verbose)
printf("Delivering evtchn upcall\n");
evtchn_irq_expected = true;
vinfo->evtchn_upcall_pending = 1;
break;
case TEST_RUNSTATE_runnable...TEST_RUNSTATE_offline:
TEST_ASSERT(!evtchn_irq_expected, "Event channel IRQ not seen");
if (!do_runstate_tests)
goto done;
if (verbose)
printf("Testing runstate %s\n", runstate_names[uc.args[1]]);
rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT;
rst.u.runstate.state = uc.args[1] + RUNSTATE_runnable -
TEST_RUNSTATE_runnable;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst);
break;
case TEST_RUNSTATE_ADJUST:
if (verbose)
printf("Testing RUNSTATE_ADJUST\n");
rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST;
memset(&rst.u, 0, sizeof(rst.u));
rst.u.runstate.state = (uint64_t)-1;
rst.u.runstate.time_blocked =
0x5a - rs->time[RUNSTATE_blocked];
rst.u.runstate.time_offline =
0x6b6b - rs->time[RUNSTATE_offline];
rst.u.runstate.time_runnable = -rst.u.runstate.time_blocked -
rst.u.runstate.time_offline;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst);
break;
case TEST_RUNSTATE_DATA:
if (verbose)
printf("Testing RUNSTATE_DATA\n");
rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA;
memset(&rst.u, 0, sizeof(rst.u));
rst.u.runstate.state = RUNSTATE_running;
rst.u.runstate.state_entry_time = 0x6b6b + 0x5a;
rst.u.runstate.time_blocked = 0x6b6b;
rst.u.runstate.time_offline = 0x5a;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &rst);
break;
case TEST_STEAL_TIME:
if (verbose)
printf("Testing steal time\n");
/* Yield until scheduler delay exceeds target */
rundelay = get_run_delay() + MIN_STEAL_TIME;
do {
sched_yield();
} while (get_run_delay() < rundelay);
break;
case TEST_EVTCHN_MASKED:
if (!do_eventfd_tests)
goto done;
if (verbose)
printf("Testing masked event channel\n");
shinfo->evtchn_mask[0] = 1UL << EVTCHN_TEST1;
eventfd_write(irq_fd[0], 1UL);
alarm(1);
break;
case TEST_EVTCHN_UNMASKED:
if (verbose)
printf("Testing unmasked event channel\n");
/* Unmask that, but deliver the other one */
shinfo->evtchn_pending[0] = 0;
shinfo->evtchn_mask[0] = 0;
eventfd_write(irq_fd[1], 1UL);
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_EVTCHN_SLOWPATH:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[1] = 0;
if (verbose)
printf("Testing event channel after memslot change\n");
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
DUMMY_REGION_GPA, DUMMY_REGION_SLOT, 1, 0);
eventfd_write(irq_fd[0], 1UL);
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_EVTCHN_SEND_IOCTL:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
if (!do_evtchn_tests)
goto done;
shinfo->evtchn_pending[0] = 0;
if (verbose)
printf("Testing injection with KVM_XEN_HVM_EVTCHN_SEND\n");
struct kvm_irq_routing_xen_evtchn e;
e.port = EVTCHN_TEST2;
e.vcpu = vcpu->id;
e.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
vm_ioctl(vm, KVM_XEN_HVM_EVTCHN_SEND, &e);
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_EVTCHN_HCALL:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[1] = 0;
if (verbose)
printf("Testing guest EVTCHNOP_send direct to evtchn\n");
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_EVTCHN_HCALL_SLOWPATH:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[0] = 0;
if (verbose)
printf("Testing guest EVTCHNOP_send direct to evtchn after memslot change\n");
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
DUMMY_REGION_GPA_2, DUMMY_REGION_SLOT_2, 1, 0);
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_EVTCHN_HCALL_EVENTFD:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[0] = 0;
if (verbose)
printf("Testing guest EVTCHNOP_send to eventfd\n");
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_TIMER_SETUP:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[1] = 0;
if (verbose)
printf("Testing guest oneshot timer\n");
break;
case TEST_TIMER_WAIT:
memset(&tmr, 0, sizeof(tmr));
tmr.type = KVM_XEN_VCPU_ATTR_TYPE_TIMER;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr);
TEST_ASSERT(tmr.u.timer.port == EVTCHN_TIMER,
"Timer port not returned");
TEST_ASSERT(tmr.u.timer.priority == KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL,
"Timer priority not returned");
TEST_ASSERT(tmr.u.timer.expires_ns > rs->state_entry_time,
"Timer expiry not returned");
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_TIMER_RESTORE:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
shinfo->evtchn_pending[0] = 0;
if (verbose)
printf("Testing restored oneshot timer\n");
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
evtchn_irq_expected = true;
alarm(1);
break;
case TEST_POLL_READY:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
if (verbose)
printf("Testing SCHEDOP_poll with already pending event\n");
shinfo->evtchn_pending[0] = shinfo->evtchn_mask[0] = 1UL << EVTCHN_TIMER;
alarm(1);
break;
case TEST_POLL_TIMEOUT:
if (verbose)
printf("Testing SCHEDOP_poll timeout\n");
shinfo->evtchn_pending[0] = 0;
alarm(1);
break;
case TEST_POLL_MASKED:
if (verbose)
printf("Testing SCHEDOP_poll wake on masked event\n");
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
alarm(1);
break;
case TEST_POLL_WAKE:
shinfo->evtchn_pending[0] = shinfo->evtchn_mask[0] = 0;
if (verbose)
printf("Testing SCHEDOP_poll wake on unmasked event\n");
evtchn_irq_expected = true;
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
/* Read it back and check the pending time is reported correctly */
tmr.u.timer.expires_ns = 0;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr);
TEST_ASSERT(tmr.u.timer.expires_ns == rs->state_entry_time + 100000000,
"Timer not reported pending");
alarm(1);
break;
case TEST_TIMER_PAST:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
/* Read timer and check it is no longer pending */
vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr);
TEST_ASSERT(!tmr.u.timer.expires_ns, "Timer still reported pending");
shinfo->evtchn_pending[0] = 0;
if (verbose)
printf("Testing timer in the past\n");
evtchn_irq_expected = true;
tmr.u.timer.expires_ns = rs->state_entry_time - 100000000ULL;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
alarm(1);
break;
case TEST_LOCKING_SEND_RACE:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
alarm(0);
if (verbose)
printf("Testing shinfo lock corruption (KVM_XEN_HVM_EVTCHN_SEND)\n");
ret = pthread_create(&thread, NULL, &juggle_shinfo_state, (void *)vm);
TEST_ASSERT(ret == 0, "pthread_create() failed: %s", strerror(ret));
struct kvm_irq_routing_xen_evtchn uxe = {
.port = 1,
.vcpu = vcpu->id,
.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL
};
evtchn_irq_expected = true;
for (time_t t = time(NULL) + SHINFO_RACE_TIMEOUT; time(NULL) < t;)
__vm_ioctl(vm, KVM_XEN_HVM_EVTCHN_SEND, &uxe);
break;
case TEST_LOCKING_POLL_RACE:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
if (verbose)
printf("Testing shinfo lock corruption (SCHEDOP_poll)\n");
shinfo->evtchn_pending[0] = 1;
evtchn_irq_expected = true;
tmr.u.timer.expires_ns = rs->state_entry_time +
SHINFO_RACE_TIMEOUT * 1000000000ULL;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
break;
case TEST_LOCKING_POLL_TIMEOUT:
/*
* Optional and possibly repeated sync point.
* Injecting the timer IRQ may fail if the
* shinfo is invalid when the timer expires.
* If the timer has expired but the IRQ hasn't
* been delivered, rearm the timer and retry.
*/
vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &tmr);
/* Resume the guest if the timer is still pending. */
if (tmr.u.timer.expires_ns)
break;
/* All done if the IRQ was delivered. */
if (!evtchn_irq_expected)
break;
tmr.u.timer.expires_ns = rs->state_entry_time +
SHINFO_RACE_TIMEOUT * 1000000000ULL;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
break;
case TEST_DONE:
TEST_ASSERT(!evtchn_irq_expected,
"Expected event channel IRQ but it didn't happen");
ret = pthread_cancel(thread);
TEST_ASSERT(ret == 0, "pthread_cancel() failed: %s", strerror(ret));
ret = pthread_join(thread, 0);
TEST_ASSERT(ret == 0, "pthread_join() failed: %s", strerror(ret));
goto done;
case TEST_GUEST_SAW_IRQ:
TEST_ASSERT(evtchn_irq_expected, "Unexpected event channel IRQ");
evtchn_irq_expected = false;
break;
}
break;
}
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
}
}
done:
evt_reset.type = KVM_XEN_ATTR_TYPE_EVTCHN;
evt_reset.u.evtchn.flags = KVM_XEN_EVTCHN_RESET;
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &evt_reset);
alarm(0);
clock_gettime(CLOCK_REALTIME, &max_ts);
/*
* Just a *really* basic check that things are being put in the
* right place. The actual calculations are much the same for
* Xen as they are for the KVM variants, so no need to check.
*/
struct pvclock_wall_clock *wc;
struct pvclock_vcpu_time_info *ti, *ti2;
wc = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0xc00);
ti = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0x40 + 0x20);
ti2 = addr_gpa2hva(vm, PVTIME_ADDR);
if (verbose) {
printf("Wall clock (v %d) %d.%09d\n", wc->version, wc->sec, wc->nsec);
printf("Time info 1: v %u tsc %" PRIu64 " time %" PRIu64 " mul %u shift %u flags %x\n",
ti->version, ti->tsc_timestamp, ti->system_time, ti->tsc_to_system_mul,
ti->tsc_shift, ti->flags);
printf("Time info 2: v %u tsc %" PRIu64 " time %" PRIu64 " mul %u shift %u flags %x\n",
ti2->version, ti2->tsc_timestamp, ti2->system_time, ti2->tsc_to_system_mul,
ti2->tsc_shift, ti2->flags);
}
vm_ts.tv_sec = wc->sec;
vm_ts.tv_nsec = wc->nsec;
TEST_ASSERT(wc->version && !(wc->version & 1),
"Bad wallclock version %x", wc->version);
TEST_ASSERT(cmp_timespec(&min_ts, &vm_ts) <= 0, "VM time too old");
TEST_ASSERT(cmp_timespec(&max_ts, &vm_ts) >= 0, "VM time too new");
TEST_ASSERT(ti->version && !(ti->version & 1),
"Bad time_info version %x", ti->version);
TEST_ASSERT(ti2->version && !(ti2->version & 1),
"Bad time_info version %x", ti->version);
if (do_runstate_tests) {
/*
* Fetch runstate and check sanity. Strictly speaking in the
* general case we might not expect the numbers to be identical
* but in this case we know we aren't running the vCPU any more.
*/
struct kvm_xen_vcpu_attr rst = {
.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA,
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_GET_ATTR, &rst);
if (verbose) {
printf("Runstate: %s(%d), entry %" PRIu64 " ns\n",
rs->state <= RUNSTATE_offline ? runstate_names[rs->state] : "unknown",
rs->state, rs->state_entry_time);
for (int i = RUNSTATE_running; i <= RUNSTATE_offline; i++) {
printf("State %s: %" PRIu64 " ns\n",
runstate_names[i], rs->time[i]);
}
}
/*
* Exercise runstate info at all points across the page boundary, in
* 32-bit and 64-bit mode. In particular, test the case where it is
* configured in 32-bit mode and then switched to 64-bit mode while
* active, which takes it onto the second page.
*/
unsigned long runstate_addr;
struct compat_vcpu_runstate_info *crs;
for (runstate_addr = SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE - sizeof(*rs) - 4;
runstate_addr < SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE + 4; runstate_addr++) {
rs = addr_gpa2hva(vm, runstate_addr);
crs = (void *)rs;
memset(rs, 0xa5, sizeof(*rs));
/* Set to compatibility mode */
lm.u.long_mode = 0;
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm);
/* Set runstate to new address (kernel will write it) */
struct kvm_xen_vcpu_attr st = {
.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR,
.u.gpa = runstate_addr,
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &st);
if (verbose)
printf("Compatibility runstate at %08lx\n", runstate_addr);
TEST_ASSERT(crs->state == rst.u.runstate.state, "Runstate mismatch");
TEST_ASSERT(crs->state_entry_time == rst.u.runstate.state_entry_time,
"State entry time mismatch");
TEST_ASSERT(crs->time[RUNSTATE_running] == rst.u.runstate.time_running,
"Running time mismatch");
TEST_ASSERT(crs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable,
"Runnable time mismatch");
TEST_ASSERT(crs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked,
"Blocked time mismatch");
TEST_ASSERT(crs->time[RUNSTATE_offline] == rst.u.runstate.time_offline,
"Offline time mismatch");
TEST_ASSERT(crs->time[RUNSTATE_offline + 1] == 0xa5a5a5a5a5a5a5a5ULL,
"Structure overrun");
TEST_ASSERT(crs->state_entry_time == crs->time[0] +
crs->time[1] + crs->time[2] + crs->time[3],
"runstate times don't add up");
/* Now switch to 64-bit mode */
lm.u.long_mode = 1;
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm);
memset(rs, 0xa5, sizeof(*rs));
/* Don't change the address, just trigger a write */
struct kvm_xen_vcpu_attr adj = {
.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST,
.u.runstate.state = (uint64_t)-1
};
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &adj);
if (verbose)
printf("64-bit runstate at %08lx\n", runstate_addr);
TEST_ASSERT(rs->state == rst.u.runstate.state, "Runstate mismatch");
TEST_ASSERT(rs->state_entry_time == rst.u.runstate.state_entry_time,
"State entry time mismatch");
TEST_ASSERT(rs->time[RUNSTATE_running] == rst.u.runstate.time_running,
"Running time mismatch");
TEST_ASSERT(rs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable,
"Runnable time mismatch");
TEST_ASSERT(rs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked,
"Blocked time mismatch");
TEST_ASSERT(rs->time[RUNSTATE_offline] == rst.u.runstate.time_offline,
"Offline time mismatch");
TEST_ASSERT(rs->time[RUNSTATE_offline + 1] == 0xa5a5a5a5a5a5a5a5ULL,
"Structure overrun");
TEST_ASSERT(rs->state_entry_time == rs->time[0] +
rs->time[1] + rs->time[2] + rs->time[3],
"runstate times don't add up");
}
}
kvm_vm_free(vm);
return 0;
}
|