summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/kvm/lib/kvm_util.c
blob: 633b22df46a4673bd199998680ac3ed6aa024f00 (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
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
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
/*
 * tools/testing/selftests/kvm/lib/kvm_util.c
 *
 * Copyright (C) 2018, Google LLC.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 */

#include "test_util.h"
#include "kvm_util.h"
#include "kvm_util_internal.h"

#include <assert.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/kernel.h>

#define KVM_UTIL_PGS_PER_HUGEPG 512
#define KVM_UTIL_MIN_PFN	2

/* Aligns x up to the next multiple of size. Size must be a power of 2. */
static void *align(void *x, size_t size)
{
	size_t mask = size - 1;
	TEST_ASSERT(size != 0 && !(size & (size - 1)),
		    "size not a power of 2: %lu", size);
	return (void *) (((size_t) x + mask) & ~mask);
}

/*
 * Capability
 *
 * Input Args:
 *   cap - Capability
 *
 * Output Args: None
 *
 * Return:
 *   On success, the Value corresponding to the capability (KVM_CAP_*)
 *   specified by the value of cap.  On failure a TEST_ASSERT failure
 *   is produced.
 *
 * Looks up and returns the value corresponding to the capability
 * (KVM_CAP_*) given by cap.
 */
int kvm_check_cap(long cap)
{
	int ret;
	int kvm_fd;

	kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
	if (kvm_fd < 0)
		exit(KSFT_SKIP);

	ret = ioctl(kvm_fd, KVM_CHECK_EXTENSION, cap);
	TEST_ASSERT(ret != -1, "KVM_CHECK_EXTENSION IOCTL failed,\n"
		"  rc: %i errno: %i", ret, errno);

	close(kvm_fd);

	return ret;
}

/* VM Enable Capability
 *
 * Input Args:
 *   vm - Virtual Machine
 *   cap - Capability
 *
 * Output Args: None
 *
 * Return: On success, 0. On failure a TEST_ASSERT failure is produced.
 *
 * Enables a capability (KVM_CAP_*) on the VM.
 */
int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap)
{
	int ret;

	ret = ioctl(vm->fd, KVM_ENABLE_CAP, cap);
	TEST_ASSERT(ret == 0, "KVM_ENABLE_CAP IOCTL failed,\n"
		"  rc: %i errno: %i", ret, errno);

	return ret;
}

static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
{
	vm->kvm_fd = open(KVM_DEV_PATH, perm);
	if (vm->kvm_fd < 0)
		exit(KSFT_SKIP);

	if (!kvm_check_cap(KVM_CAP_IMMEDIATE_EXIT)) {
		fprintf(stderr, "immediate_exit not available, skipping test\n");
		exit(KSFT_SKIP);
	}

	vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, type);
	TEST_ASSERT(vm->fd >= 0, "KVM_CREATE_VM ioctl failed, "
		"rc: %i errno: %i", vm->fd, errno);
}

const char * const vm_guest_mode_string[] = {
	"PA-bits:52, VA-bits:48, 4K pages",
	"PA-bits:52, VA-bits:48, 64K pages",
	"PA-bits:48, VA-bits:48, 4K pages",
	"PA-bits:48, VA-bits:48, 64K pages",
	"PA-bits:40, VA-bits:48, 4K pages",
	"PA-bits:40, VA-bits:48, 64K pages",
};
_Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
	       "Missing new mode strings?");

/*
 * VM Create
 *
 * Input Args:
 *   mode - VM Mode (e.g. VM_MODE_P52V48_4K)
 *   phy_pages - Physical memory pages
 *   perm - permission
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to opaque structure that describes the created VM.
 *
 * Creates a VM with the mode specified by mode (e.g. VM_MODE_P52V48_4K).
 * When phy_pages is non-zero, a memory region of phy_pages physical pages
 * is created and mapped starting at guest physical address 0.  The file
 * descriptor to control the created VM is created with the permissions
 * given by perm (e.g. O_RDWR).
 */
struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
			  int perm, unsigned long type)
{
	struct kvm_vm *vm;

	vm = calloc(1, sizeof(*vm));
	TEST_ASSERT(vm != NULL, "Insufficient Memory");

	vm->mode = mode;
	vm->type = type;
	vm_open(vm, perm, type);

	/* Setup mode specific traits. */
	switch (vm->mode) {
	case VM_MODE_P52V48_4K:
		vm->pgtable_levels = 4;
		vm->pa_bits = 52;
		vm->va_bits = 48;
		vm->page_size = 0x1000;
		vm->page_shift = 12;
		break;
	case VM_MODE_P52V48_64K:
		vm->pgtable_levels = 3;
		vm->pa_bits = 52;
		vm->va_bits = 48;
		vm->page_size = 0x10000;
		vm->page_shift = 16;
		break;
	case VM_MODE_P48V48_4K:
		vm->pgtable_levels = 4;
		vm->pa_bits = 48;
		vm->va_bits = 48;
		vm->page_size = 0x1000;
		vm->page_shift = 12;
		break;
	case VM_MODE_P48V48_64K:
		vm->pgtable_levels = 3;
		vm->pa_bits = 48;
		vm->va_bits = 48;
		vm->page_size = 0x10000;
		vm->page_shift = 16;
		break;
	case VM_MODE_P40V48_4K:
		vm->pgtable_levels = 4;
		vm->pa_bits = 40;
		vm->va_bits = 48;
		vm->page_size = 0x1000;
		vm->page_shift = 12;
		break;
	case VM_MODE_P40V48_64K:
		vm->pgtable_levels = 3;
		vm->pa_bits = 40;
		vm->va_bits = 48;
		vm->page_size = 0x10000;
		vm->page_shift = 16;
		break;
	default:
		TEST_ASSERT(false, "Unknown guest mode, mode: 0x%x", mode);
	}

	/* Limit to VA-bit canonical virtual addresses. */
	vm->vpages_valid = sparsebit_alloc();
	sparsebit_set_num(vm->vpages_valid,
		0, (1ULL << (vm->va_bits - 1)) >> vm->page_shift);
	sparsebit_set_num(vm->vpages_valid,
		(~((1ULL << (vm->va_bits - 1)) - 1)) >> vm->page_shift,
		(1ULL << (vm->va_bits - 1)) >> vm->page_shift);

	/* Limit physical addresses to PA-bits. */
	vm->max_gfn = ((1ULL << vm->pa_bits) >> vm->page_shift) - 1;

	/* Allocate and setup memory for guest. */
	vm->vpages_mapped = sparsebit_alloc();
	if (phy_pages != 0)
		vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
					    0, 0, phy_pages, 0);

	return vm;
}

struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
{
	return _vm_create(mode, phy_pages, perm, 0);
}

/*
 * VM Restart
 *
 * Input Args:
 *   vm - VM that has been released before
 *   perm - permission
 *
 * Output Args: None
 *
 * Reopens the file descriptors associated to the VM and reinstates the
 * global state, such as the irqchip and the memory regions that are mapped
 * into the guest.
 */
void kvm_vm_restart(struct kvm_vm *vmp, int perm)
{
	struct userspace_mem_region *region;

	vm_open(vmp, perm, vmp->type);
	if (vmp->has_irqchip)
		vm_create_irqchip(vmp);

	for (region = vmp->userspace_mem_region_head; region;
		region = region->next) {
		int ret = ioctl(vmp->fd, KVM_SET_USER_MEMORY_REGION, &region->region);
		TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n"
			    "  rc: %i errno: %i\n"
			    "  slot: %u flags: 0x%x\n"
			    "  guest_phys_addr: 0x%lx size: 0x%lx",
			    ret, errno, region->region.slot,
			    region->region.flags,
			    region->region.guest_phys_addr,
			    region->region.memory_size);
	}
}

void kvm_vm_get_dirty_log(struct kvm_vm *vm, int slot, void *log)
{
	struct kvm_dirty_log args = { .dirty_bitmap = log, .slot = slot };
	int ret;

	ret = ioctl(vm->fd, KVM_GET_DIRTY_LOG, &args);
	TEST_ASSERT(ret == 0, "%s: KVM_GET_DIRTY_LOG failed: %s",
		    strerror(-ret));
}

void kvm_vm_clear_dirty_log(struct kvm_vm *vm, int slot, void *log,
			    uint64_t first_page, uint32_t num_pages)
{
	struct kvm_clear_dirty_log args = { .dirty_bitmap = log, .slot = slot,
		                            .first_page = first_page,
	                                    .num_pages = num_pages };
	int ret;

	ret = ioctl(vm->fd, KVM_CLEAR_DIRTY_LOG, &args);
	TEST_ASSERT(ret == 0, "%s: KVM_CLEAR_DIRTY_LOG failed: %s",
		    strerror(-ret));
}

/*
 * Userspace Memory Region Find
 *
 * Input Args:
 *   vm - Virtual Machine
 *   start - Starting VM physical address
 *   end - Ending VM physical address, inclusive.
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to overlapping region, NULL if no such region.
 *
 * Searches for a region with any physical memory that overlaps with
 * any portion of the guest physical addresses from start to end
 * inclusive.  If multiple overlapping regions exist, a pointer to any
 * of the regions is returned.  Null is returned only when no overlapping
 * region exists.
 */
static struct userspace_mem_region *
userspace_mem_region_find(struct kvm_vm *vm, uint64_t start, uint64_t end)
{
	struct userspace_mem_region *region;

	for (region = vm->userspace_mem_region_head; region;
		region = region->next) {
		uint64_t existing_start = region->region.guest_phys_addr;
		uint64_t existing_end = region->region.guest_phys_addr
			+ region->region.memory_size - 1;
		if (start <= existing_end && end >= existing_start)
			return region;
	}

	return NULL;
}

/*
 * KVM Userspace Memory Region Find
 *
 * Input Args:
 *   vm - Virtual Machine
 *   start - Starting VM physical address
 *   end - Ending VM physical address, inclusive.
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to overlapping region, NULL if no such region.
 *
 * Public interface to userspace_mem_region_find. Allows tests to look up
 * the memslot datastructure for a given range of guest physical memory.
 */
struct kvm_userspace_memory_region *
kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
				 uint64_t end)
{
	struct userspace_mem_region *region;

	region = userspace_mem_region_find(vm, start, end);
	if (!region)
		return NULL;

	return &region->region;
}

/*
 * VCPU Find
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to VCPU structure
 *
 * Locates a vcpu structure that describes the VCPU specified by vcpuid and
 * returns a pointer to it.  Returns NULL if the VM doesn't contain a VCPU
 * for the specified vcpuid.
 */
struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpup;

	for (vcpup = vm->vcpu_head; vcpup; vcpup = vcpup->next) {
		if (vcpup->id == vcpuid)
			return vcpup;
	}

	return NULL;
}

/*
 * VM VCPU Remove
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args: None
 *
 * Return: None, TEST_ASSERT failures for all error conditions
 *
 * Within the VM specified by vm, removes the VCPU given by vcpuid.
 */
static void vm_vcpu_rm(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	ret = munmap(vcpu->state, sizeof(*vcpu->state));
	TEST_ASSERT(ret == 0, "munmap of VCPU fd failed, rc: %i "
		"errno: %i", ret, errno);
	close(vcpu->fd);
	TEST_ASSERT(ret == 0, "Close of VCPU fd failed, rc: %i "
		"errno: %i", ret, errno);

	if (vcpu->next)
		vcpu->next->prev = vcpu->prev;
	if (vcpu->prev)
		vcpu->prev->next = vcpu->next;
	else
		vm->vcpu_head = vcpu->next;
	free(vcpu);
}

void kvm_vm_release(struct kvm_vm *vmp)
{
	int ret;

	while (vmp->vcpu_head)
		vm_vcpu_rm(vmp, vmp->vcpu_head->id);

	ret = close(vmp->fd);
	TEST_ASSERT(ret == 0, "Close of vm fd failed,\n"
		"  vmp->fd: %i rc: %i errno: %i", vmp->fd, ret, errno);

	close(vmp->kvm_fd);
	TEST_ASSERT(ret == 0, "Close of /dev/kvm fd failed,\n"
		"  vmp->kvm_fd: %i rc: %i errno: %i", vmp->kvm_fd, ret, errno);
}

/*
 * Destroys and frees the VM pointed to by vmp.
 */
void kvm_vm_free(struct kvm_vm *vmp)
{
	int ret;

	if (vmp == NULL)
		return;

	/* Free userspace_mem_regions. */
	while (vmp->userspace_mem_region_head) {
		struct userspace_mem_region *region
			= vmp->userspace_mem_region_head;

		region->region.memory_size = 0;
		ret = ioctl(vmp->fd, KVM_SET_USER_MEMORY_REGION,
			&region->region);
		TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed, "
			"rc: %i errno: %i", ret, errno);

		vmp->userspace_mem_region_head = region->next;
		sparsebit_free(&region->unused_phy_pages);
		ret = munmap(region->mmap_start, region->mmap_size);
		TEST_ASSERT(ret == 0, "munmap failed, rc: %i errno: %i",
			    ret, errno);

		free(region);
	}

	/* Free sparsebit arrays. */
	sparsebit_free(&vmp->vpages_valid);
	sparsebit_free(&vmp->vpages_mapped);

	kvm_vm_release(vmp);

	/* Free the structure describing the VM. */
	free(vmp);
}

/*
 * Memory Compare, host virtual to guest virtual
 *
 * Input Args:
 *   hva - Starting host virtual address
 *   vm - Virtual Machine
 *   gva - Starting guest virtual address
 *   len - number of bytes to compare
 *
 * Output Args: None
 *
 * Input/Output Args: None
 *
 * Return:
 *   Returns 0 if the bytes starting at hva for a length of len
 *   are equal the guest virtual bytes starting at gva.  Returns
 *   a value < 0, if bytes at hva are less than those at gva.
 *   Otherwise a value > 0 is returned.
 *
 * Compares the bytes starting at the host virtual address hva, for
 * a length of len, to the guest bytes starting at the guest virtual
 * address given by gva.
 */
int kvm_memcmp_hva_gva(void *hva, struct kvm_vm *vm, vm_vaddr_t gva, size_t len)
{
	size_t amt;

	/*
	 * Compare a batch of bytes until either a match is found
	 * or all the bytes have been compared.
	 */
	for (uintptr_t offset = 0; offset < len; offset += amt) {
		uintptr_t ptr1 = (uintptr_t)hva + offset;

		/*
		 * Determine host address for guest virtual address
		 * at offset.
		 */
		uintptr_t ptr2 = (uintptr_t)addr_gva2hva(vm, gva + offset);

		/*
		 * Determine amount to compare on this pass.
		 * Don't allow the comparsion to cross a page boundary.
		 */
		amt = len - offset;
		if ((ptr1 >> vm->page_shift) != ((ptr1 + amt) >> vm->page_shift))
			amt = vm->page_size - (ptr1 % vm->page_size);
		if ((ptr2 >> vm->page_shift) != ((ptr2 + amt) >> vm->page_shift))
			amt = vm->page_size - (ptr2 % vm->page_size);

		assert((ptr1 >> vm->page_shift) == ((ptr1 + amt - 1) >> vm->page_shift));
		assert((ptr2 >> vm->page_shift) == ((ptr2 + amt - 1) >> vm->page_shift));

		/*
		 * Perform the comparison.  If there is a difference
		 * return that result to the caller, otherwise need
		 * to continue on looking for a mismatch.
		 */
		int ret = memcmp((void *)ptr1, (void *)ptr2, amt);
		if (ret != 0)
			return ret;
	}

	/*
	 * No mismatch found.  Let the caller know the two memory
	 * areas are equal.
	 */
	return 0;
}

/*
 * VM Userspace Memory Region Add
 *
 * Input Args:
 *   vm - Virtual Machine
 *   backing_src - Storage source for this region.
 *                 NULL to use anonymous memory.
 *   guest_paddr - Starting guest physical address
 *   slot - KVM region slot
 *   npages - Number of physical pages
 *   flags - KVM memory region flags (e.g. KVM_MEM_LOG_DIRTY_PAGES)
 *
 * Output Args: None
 *
 * Return: None
 *
 * Allocates a memory area of the number of pages specified by npages
 * and maps it to the VM specified by vm, at a starting physical address
 * given by guest_paddr.  The region is created with a KVM region slot
 * given by slot, which must be unique and < KVM_MEM_SLOTS_NUM.  The
 * region is created with the flags given by flags.
 */
void vm_userspace_mem_region_add(struct kvm_vm *vm,
	enum vm_mem_backing_src_type src_type,
	uint64_t guest_paddr, uint32_t slot, uint64_t npages,
	uint32_t flags)
{
	int ret;
	struct userspace_mem_region *region;
	size_t huge_page_size = KVM_UTIL_PGS_PER_HUGEPG * vm->page_size;

	TEST_ASSERT((guest_paddr % vm->page_size) == 0, "Guest physical "
		"address not on a page boundary.\n"
		"  guest_paddr: 0x%lx vm->page_size: 0x%x",
		guest_paddr, vm->page_size);
	TEST_ASSERT((((guest_paddr >> vm->page_shift) + npages) - 1)
		<= vm->max_gfn, "Physical range beyond maximum "
		"supported physical address,\n"
		"  guest_paddr: 0x%lx npages: 0x%lx\n"
		"  vm->max_gfn: 0x%lx vm->page_size: 0x%x",
		guest_paddr, npages, vm->max_gfn, vm->page_size);

	/*
	 * Confirm a mem region with an overlapping address doesn't
	 * already exist.
	 */
	region = (struct userspace_mem_region *) userspace_mem_region_find(
		vm, guest_paddr, (guest_paddr + npages * vm->page_size) - 1);
	if (region != NULL)
		TEST_ASSERT(false, "overlapping userspace_mem_region already "
			"exists\n"
			"  requested guest_paddr: 0x%lx npages: 0x%lx "
			"page_size: 0x%x\n"
			"  existing guest_paddr: 0x%lx size: 0x%lx",
			guest_paddr, npages, vm->page_size,
			(uint64_t) region->region.guest_phys_addr,
			(uint64_t) region->region.memory_size);

	/* Confirm no region with the requested slot already exists. */
	for (region = vm->userspace_mem_region_head; region;
		region = region->next) {
		if (region->region.slot == slot)
			break;
	}
	if (region != NULL)
		TEST_ASSERT(false, "A mem region with the requested slot "
			"already exists.\n"
			"  requested slot: %u paddr: 0x%lx npages: 0x%lx\n"
			"  existing slot: %u paddr: 0x%lx size: 0x%lx",
			slot, guest_paddr, npages,
			region->region.slot,
			(uint64_t) region->region.guest_phys_addr,
			(uint64_t) region->region.memory_size);

	/* Allocate and initialize new mem region structure. */
	region = calloc(1, sizeof(*region));
	TEST_ASSERT(region != NULL, "Insufficient Memory");
	region->mmap_size = npages * vm->page_size;

	/* Enough memory to align up to a huge page. */
	if (src_type == VM_MEM_SRC_ANONYMOUS_THP)
		region->mmap_size += huge_page_size;
	region->mmap_start = mmap(NULL, region->mmap_size,
				  PROT_READ | PROT_WRITE,
				  MAP_PRIVATE | MAP_ANONYMOUS
				  | (src_type == VM_MEM_SRC_ANONYMOUS_HUGETLB ? MAP_HUGETLB : 0),
				  -1, 0);
	TEST_ASSERT(region->mmap_start != MAP_FAILED,
		    "test_malloc failed, mmap_start: %p errno: %i",
		    region->mmap_start, errno);

	/* Align THP allocation up to start of a huge page. */
	region->host_mem = align(region->mmap_start,
				 src_type == VM_MEM_SRC_ANONYMOUS_THP ?  huge_page_size : 1);

	/* As needed perform madvise */
	if (src_type == VM_MEM_SRC_ANONYMOUS || src_type == VM_MEM_SRC_ANONYMOUS_THP) {
		ret = madvise(region->host_mem, npages * vm->page_size,
			     src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE);
		TEST_ASSERT(ret == 0, "madvise failed,\n"
			    "  addr: %p\n"
			    "  length: 0x%lx\n"
			    "  src_type: %x",
			    region->host_mem, npages * vm->page_size, src_type);
	}

	region->unused_phy_pages = sparsebit_alloc();
	sparsebit_set_num(region->unused_phy_pages,
		guest_paddr >> vm->page_shift, npages);
	region->region.slot = slot;
	region->region.flags = flags;
	region->region.guest_phys_addr = guest_paddr;
	region->region.memory_size = npages * vm->page_size;
	region->region.userspace_addr = (uintptr_t) region->host_mem;
	ret = ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, &region->region);
	TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n"
		"  rc: %i errno: %i\n"
		"  slot: %u flags: 0x%x\n"
		"  guest_phys_addr: 0x%lx size: 0x%lx",
		ret, errno, slot, flags,
		guest_paddr, (uint64_t) region->region.memory_size);

	/* Add to linked-list of memory regions. */
	if (vm->userspace_mem_region_head)
		vm->userspace_mem_region_head->prev = region;
	region->next = vm->userspace_mem_region_head;
	vm->userspace_mem_region_head = region;
}

/*
 * Memslot to region
 *
 * Input Args:
 *   vm - Virtual Machine
 *   memslot - KVM memory slot ID
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to memory region structure that describe memory region
 *   using kvm memory slot ID given by memslot.  TEST_ASSERT failure
 *   on error (e.g. currently no memory region using memslot as a KVM
 *   memory slot ID).
 */
static struct userspace_mem_region *
memslot2region(struct kvm_vm *vm, uint32_t memslot)
{
	struct userspace_mem_region *region;

	for (region = vm->userspace_mem_region_head; region;
		region = region->next) {
		if (region->region.slot == memslot)
			break;
	}
	if (region == NULL) {
		fprintf(stderr, "No mem region with the requested slot found,\n"
			"  requested slot: %u\n", memslot);
		fputs("---- vm dump ----\n", stderr);
		vm_dump(stderr, vm, 2);
		TEST_ASSERT(false, "Mem region not found");
	}

	return region;
}

/*
 * VM Memory Region Flags Set
 *
 * Input Args:
 *   vm - Virtual Machine
 *   flags - Starting guest physical address
 *
 * Output Args: None
 *
 * Return: None
 *
 * Sets the flags of the memory region specified by the value of slot,
 * to the values given by flags.
 */
void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags)
{
	int ret;
	struct userspace_mem_region *region;

	region = memslot2region(vm, slot);

	region->region.flags = flags;

	ret = ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, &region->region);

	TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n"
		"  rc: %i errno: %i slot: %u flags: 0x%x",
		ret, errno, slot, flags);
}

/*
 * VCPU mmap Size
 *
 * Input Args: None
 *
 * Output Args: None
 *
 * Return:
 *   Size of VCPU state
 *
 * Returns the size of the structure pointed to by the return value
 * of vcpu_state().
 */
static int vcpu_mmap_sz(void)
{
	int dev_fd, ret;

	dev_fd = open(KVM_DEV_PATH, O_RDONLY);
	if (dev_fd < 0)
		exit(KSFT_SKIP);

	ret = ioctl(dev_fd, KVM_GET_VCPU_MMAP_SIZE, NULL);
	TEST_ASSERT(ret >= sizeof(struct kvm_run),
		"%s KVM_GET_VCPU_MMAP_SIZE ioctl failed, rc: %i errno: %i",
		__func__, ret, errno);

	close(dev_fd);

	return ret;
}

/*
 * VM VCPU Add
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args: None
 *
 * Return: None
 *
 * Creates and adds to the VM specified by vm and virtual CPU with
 * the ID given by vcpuid.
 */
void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, int pgd_memslot,
		 int gdt_memslot)
{
	struct vcpu *vcpu;

	/* Confirm a vcpu with the specified id doesn't already exist. */
	vcpu = vcpu_find(vm, vcpuid);
	if (vcpu != NULL)
		TEST_ASSERT(false, "vcpu with the specified id "
			"already exists,\n"
			"  requested vcpuid: %u\n"
			"  existing vcpuid: %u state: %p",
			vcpuid, vcpu->id, vcpu->state);

	/* Allocate and initialize new vcpu structure. */
	vcpu = calloc(1, sizeof(*vcpu));
	TEST_ASSERT(vcpu != NULL, "Insufficient Memory");
	vcpu->id = vcpuid;
	vcpu->fd = ioctl(vm->fd, KVM_CREATE_VCPU, vcpuid);
	TEST_ASSERT(vcpu->fd >= 0, "KVM_CREATE_VCPU failed, rc: %i errno: %i",
		vcpu->fd, errno);

	TEST_ASSERT(vcpu_mmap_sz() >= sizeof(*vcpu->state), "vcpu mmap size "
		"smaller than expected, vcpu_mmap_sz: %i expected_min: %zi",
		vcpu_mmap_sz(), sizeof(*vcpu->state));
	vcpu->state = (struct kvm_run *) mmap(NULL, sizeof(*vcpu->state),
		PROT_READ | PROT_WRITE, MAP_SHARED, vcpu->fd, 0);
	TEST_ASSERT(vcpu->state != MAP_FAILED, "mmap vcpu_state failed, "
		"vcpu id: %u errno: %i", vcpuid, errno);

	/* Add to linked-list of VCPUs. */
	if (vm->vcpu_head)
		vm->vcpu_head->prev = vcpu;
	vcpu->next = vm->vcpu_head;
	vm->vcpu_head = vcpu;

	vcpu_setup(vm, vcpuid, pgd_memslot, gdt_memslot);
}

/*
 * VM Virtual Address Unused Gap
 *
 * Input Args:
 *   vm - Virtual Machine
 *   sz - Size (bytes)
 *   vaddr_min - Minimum Virtual Address
 *
 * Output Args: None
 *
 * Return:
 *   Lowest virtual address at or below vaddr_min, with at least
 *   sz unused bytes.  TEST_ASSERT failure if no area of at least
 *   size sz is available.
 *
 * Within the VM specified by vm, locates the lowest starting virtual
 * address >= vaddr_min, that has at least sz unallocated bytes.  A
 * TEST_ASSERT failure occurs for invalid input or no area of at least
 * sz unallocated bytes >= vaddr_min is available.
 */
static vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz,
				      vm_vaddr_t vaddr_min)
{
	uint64_t pages = (sz + vm->page_size - 1) >> vm->page_shift;

	/* Determine lowest permitted virtual page index. */
	uint64_t pgidx_start = (vaddr_min + vm->page_size - 1) >> vm->page_shift;
	if ((pgidx_start * vm->page_size) < vaddr_min)
		goto no_va_found;

	/* Loop over section with enough valid virtual page indexes. */
	if (!sparsebit_is_set_num(vm->vpages_valid,
		pgidx_start, pages))
		pgidx_start = sparsebit_next_set_num(vm->vpages_valid,
			pgidx_start, pages);
	do {
		/*
		 * Are there enough unused virtual pages available at
		 * the currently proposed starting virtual page index.
		 * If not, adjust proposed starting index to next
		 * possible.
		 */
		if (sparsebit_is_clear_num(vm->vpages_mapped,
			pgidx_start, pages))
			goto va_found;
		pgidx_start = sparsebit_next_clear_num(vm->vpages_mapped,
			pgidx_start, pages);
		if (pgidx_start == 0)
			goto no_va_found;

		/*
		 * If needed, adjust proposed starting virtual address,
		 * to next range of valid virtual addresses.
		 */
		if (!sparsebit_is_set_num(vm->vpages_valid,
			pgidx_start, pages)) {
			pgidx_start = sparsebit_next_set_num(
				vm->vpages_valid, pgidx_start, pages);
			if (pgidx_start == 0)
				goto no_va_found;
		}
	} while (pgidx_start != 0);

no_va_found:
	TEST_ASSERT(false, "No vaddr of specified pages available, "
		"pages: 0x%lx", pages);

	/* NOT REACHED */
	return -1;

va_found:
	TEST_ASSERT(sparsebit_is_set_num(vm->vpages_valid,
		pgidx_start, pages),
		"Unexpected, invalid virtual page index range,\n"
		"  pgidx_start: 0x%lx\n"
		"  pages: 0x%lx",
		pgidx_start, pages);
	TEST_ASSERT(sparsebit_is_clear_num(vm->vpages_mapped,
		pgidx_start, pages),
		"Unexpected, pages already mapped,\n"
		"  pgidx_start: 0x%lx\n"
		"  pages: 0x%lx",
		pgidx_start, pages);

	return pgidx_start * vm->page_size;
}

/*
 * VM Virtual Address Allocate
 *
 * Input Args:
 *   vm - Virtual Machine
 *   sz - Size in bytes
 *   vaddr_min - Minimum starting virtual address
 *   data_memslot - Memory region slot for data pages
 *   pgd_memslot - Memory region slot for new virtual translation tables
 *
 * Output Args: None
 *
 * Return:
 *   Starting guest virtual address
 *
 * Allocates at least sz bytes within the virtual address space of the vm
 * given by vm.  The allocated bytes are mapped to a virtual address >=
 * the address given by vaddr_min.  Note that each allocation uses a
 * a unique set of pages, with the minimum real allocation being at least
 * a page.
 */
vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
			  uint32_t data_memslot, uint32_t pgd_memslot)
{
	uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0);

	virt_pgd_alloc(vm, pgd_memslot);

	/*
	 * Find an unused range of virtual page addresses of at least
	 * pages in length.
	 */
	vm_vaddr_t vaddr_start = vm_vaddr_unused_gap(vm, sz, vaddr_min);

	/* Map the virtual pages. */
	for (vm_vaddr_t vaddr = vaddr_start; pages > 0;
		pages--, vaddr += vm->page_size) {
		vm_paddr_t paddr;

		paddr = vm_phy_page_alloc(vm,
				KVM_UTIL_MIN_PFN * vm->page_size, data_memslot);

		virt_pg_map(vm, vaddr, paddr, pgd_memslot);

		sparsebit_set(vm->vpages_mapped,
			vaddr >> vm->page_shift);
	}

	return vaddr_start;
}

/*
 * Map a range of VM virtual address to the VM's physical address
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vaddr - Virtuall address to map
 *   paddr - VM Physical Address
 *   size - The size of the range to map
 *   pgd_memslot - Memory region slot for new virtual translation tables
 *
 * Output Args: None
 *
 * Return: None
 *
 * Within the VM given by vm, creates a virtual translation for the
 * page range starting at vaddr to the page range starting at paddr.
 */
void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
	      size_t size, uint32_t pgd_memslot)
{
	size_t page_size = vm->page_size;
	size_t npages = size / page_size;

	TEST_ASSERT(vaddr + size > vaddr, "Vaddr overflow");
	TEST_ASSERT(paddr + size > paddr, "Paddr overflow");

	while (npages--) {
		virt_pg_map(vm, vaddr, paddr, pgd_memslot);
		vaddr += page_size;
		paddr += page_size;
	}
}

/*
 * Address VM Physical to Host Virtual
 *
 * Input Args:
 *   vm - Virtual Machine
 *   gpa - VM physical address
 *
 * Output Args: None
 *
 * Return:
 *   Equivalent host virtual address
 *
 * Locates the memory region containing the VM physical address given
 * by gpa, within the VM given by vm.  When found, the host virtual
 * address providing the memory to the vm physical address is returned.
 * A TEST_ASSERT failure occurs if no region containing gpa exists.
 */
void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa)
{
	struct userspace_mem_region *region;
	for (region = vm->userspace_mem_region_head; region;
	     region = region->next) {
		if ((gpa >= region->region.guest_phys_addr)
			&& (gpa <= (region->region.guest_phys_addr
				+ region->region.memory_size - 1)))
			return (void *) ((uintptr_t) region->host_mem
				+ (gpa - region->region.guest_phys_addr));
	}

	TEST_ASSERT(false, "No vm physical memory at 0x%lx", gpa);
	return NULL;
}

/*
 * Address Host Virtual to VM Physical
 *
 * Input Args:
 *   vm - Virtual Machine
 *   hva - Host virtual address
 *
 * Output Args: None
 *
 * Return:
 *   Equivalent VM physical address
 *
 * Locates the memory region containing the host virtual address given
 * by hva, within the VM given by vm.  When found, the equivalent
 * VM physical address is returned. A TEST_ASSERT failure occurs if no
 * region containing hva exists.
 */
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva)
{
	struct userspace_mem_region *region;
	for (region = vm->userspace_mem_region_head; region;
	     region = region->next) {
		if ((hva >= region->host_mem)
			&& (hva <= (region->host_mem
				+ region->region.memory_size - 1)))
			return (vm_paddr_t) ((uintptr_t)
				region->region.guest_phys_addr
				+ (hva - (uintptr_t) region->host_mem));
	}

	TEST_ASSERT(false, "No mapping to a guest physical address, "
		"hva: %p", hva);
	return -1;
}

/*
 * VM Create IRQ Chip
 *
 * Input Args:
 *   vm - Virtual Machine
 *
 * Output Args: None
 *
 * Return: None
 *
 * Creates an interrupt controller chip for the VM specified by vm.
 */
void vm_create_irqchip(struct kvm_vm *vm)
{
	int ret;

	ret = ioctl(vm->fd, KVM_CREATE_IRQCHIP, 0);
	TEST_ASSERT(ret == 0, "KVM_CREATE_IRQCHIP IOCTL failed, "
		"rc: %i errno: %i", ret, errno);

	vm->has_irqchip = true;
}

/*
 * VM VCPU State
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to structure that describes the state of the VCPU.
 *
 * Locates and returns a pointer to a structure that describes the
 * state of the VCPU with the given vcpuid.
 */
struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	return vcpu->state;
}

/*
 * VM VCPU Run
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args: None
 *
 * Return: None
 *
 * Switch to executing the code for the VCPU given by vcpuid, within the VM
 * given by vm.
 */
void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
{
	int ret = _vcpu_run(vm, vcpuid);
	TEST_ASSERT(ret == 0, "KVM_RUN IOCTL failed, "
		"rc: %i errno: %i", ret, errno);
}

int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int rc;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
	do {
		rc = ioctl(vcpu->fd, KVM_RUN, NULL);
	} while (rc == -1 && errno == EINTR);
	return rc;
}

void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	vcpu->state->immediate_exit = 1;
	ret = ioctl(vcpu->fd, KVM_RUN, NULL);
	vcpu->state->immediate_exit = 0;

	TEST_ASSERT(ret == -1 && errno == EINTR,
		    "KVM_RUN IOCTL didn't exit immediately, rc: %i, errno: %i",
		    ret, errno);
}

/*
 * VM VCPU Set MP State
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *   mp_state - mp_state to be set
 *
 * Output Args: None
 *
 * Return: None
 *
 * Sets the MP state of the VCPU given by vcpuid, to the state given
 * by mp_state.
 */
void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
		       struct kvm_mp_state *mp_state)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_SET_MP_STATE, mp_state);
	TEST_ASSERT(ret == 0, "KVM_SET_MP_STATE IOCTL failed, "
		"rc: %i errno: %i", ret, errno);
}

/*
 * VM VCPU Regs Get
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args:
 *   regs - current state of VCPU regs
 *
 * Return: None
 *
 * Obtains the current register state for the VCPU specified by vcpuid
 * and stores it at the location given by regs.
 */
void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_GET_REGS, regs);
	TEST_ASSERT(ret == 0, "KVM_GET_REGS failed, rc: %i errno: %i",
		ret, errno);
}

/*
 * VM VCPU Regs Set
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *   regs - Values to set VCPU regs to
 *
 * Output Args: None
 *
 * Return: None
 *
 * Sets the regs of the VCPU specified by vcpuid to the values
 * given by regs.
 */
void vcpu_regs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_SET_REGS, regs);
	TEST_ASSERT(ret == 0, "KVM_SET_REGS failed, rc: %i errno: %i",
		ret, errno);
}

void vcpu_events_get(struct kvm_vm *vm, uint32_t vcpuid,
		     struct kvm_vcpu_events *events)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_GET_VCPU_EVENTS, events);
	TEST_ASSERT(ret == 0, "KVM_GET_VCPU_EVENTS, failed, rc: %i errno: %i",
		ret, errno);
}

void vcpu_events_set(struct kvm_vm *vm, uint32_t vcpuid,
		     struct kvm_vcpu_events *events)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_SET_VCPU_EVENTS, events);
	TEST_ASSERT(ret == 0, "KVM_SET_VCPU_EVENTS, failed, rc: %i errno: %i",
		ret, errno);
}

#ifdef __x86_64__
void vcpu_nested_state_get(struct kvm_vm *vm, uint32_t vcpuid,
			   struct kvm_nested_state *state)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_GET_NESTED_STATE, state);
	TEST_ASSERT(ret == 0,
		"KVM_SET_NESTED_STATE failed, ret: %i errno: %i",
		ret, errno);
}

int vcpu_nested_state_set(struct kvm_vm *vm, uint32_t vcpuid,
			  struct kvm_nested_state *state, bool ignore_error)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_SET_NESTED_STATE, state);
	if (!ignore_error) {
		TEST_ASSERT(ret == 0,
			"KVM_SET_NESTED_STATE failed, ret: %i errno: %i",
			ret, errno);
	}

	return ret;
}
#endif

/*
 * VM VCPU System Regs Get
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *
 * Output Args:
 *   sregs - current state of VCPU system regs
 *
 * Return: None
 *
 * Obtains the current system register state for the VCPU specified by
 * vcpuid and stores it at the location given by sregs.
 */
void vcpu_sregs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_sregs *sregs)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, KVM_GET_SREGS, sregs);
	TEST_ASSERT(ret == 0, "KVM_GET_SREGS failed, rc: %i errno: %i",
		ret, errno);
}

/*
 * VM VCPU System Regs Set
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *   sregs - Values to set VCPU system regs to
 *
 * Output Args: None
 *
 * Return: None
 *
 * Sets the system regs of the VCPU specified by vcpuid to the values
 * given by sregs.
 */
void vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_sregs *sregs)
{
	int ret = _vcpu_sregs_set(vm, vcpuid, sregs);
	TEST_ASSERT(ret == 0, "KVM_RUN IOCTL failed, "
		"rc: %i errno: %i", ret, errno);
}

int _vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_sregs *sregs)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	return ioctl(vcpu->fd, KVM_SET_SREGS, sregs);
}

/*
 * VCPU Ioctl
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU ID
 *   cmd - Ioctl number
 *   arg - Argument to pass to the ioctl
 *
 * Return: None
 *
 * Issues an arbitrary ioctl on a VCPU fd.
 */
void vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid,
		unsigned long cmd, void *arg)
{
	int ret;

	ret = _vcpu_ioctl(vm, vcpuid, cmd, arg);
	TEST_ASSERT(ret == 0, "vcpu ioctl %lu failed, rc: %i errno: %i (%s)",
		cmd, ret, errno, strerror(errno));
}

int _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid,
		unsigned long cmd, void *arg)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int ret;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	ret = ioctl(vcpu->fd, cmd, arg);

	return ret;
}

/*
 * VM Ioctl
 *
 * Input Args:
 *   vm - Virtual Machine
 *   cmd - Ioctl number
 *   arg - Argument to pass to the ioctl
 *
 * Return: None
 *
 * Issues an arbitrary ioctl on a VM fd.
 */
void vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
{
	int ret;

	ret = ioctl(vm->fd, cmd, arg);
	TEST_ASSERT(ret == 0, "vm ioctl %lu failed, rc: %i errno: %i (%s)",
		cmd, ret, errno, strerror(errno));
}

/*
 * VM Dump
 *
 * Input Args:
 *   vm - Virtual Machine
 *   indent - Left margin indent amount
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps the current state of the VM given by vm, to the FILE stream
 * given by stream.
 */
void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
{
	struct userspace_mem_region *region;
	struct vcpu *vcpu;

	fprintf(stream, "%*smode: 0x%x\n", indent, "", vm->mode);
	fprintf(stream, "%*sfd: %i\n", indent, "", vm->fd);
	fprintf(stream, "%*spage_size: 0x%x\n", indent, "", vm->page_size);
	fprintf(stream, "%*sMem Regions:\n", indent, "");
	for (region = vm->userspace_mem_region_head; region;
		region = region->next) {
		fprintf(stream, "%*sguest_phys: 0x%lx size: 0x%lx "
			"host_virt: %p\n", indent + 2, "",
			(uint64_t) region->region.guest_phys_addr,
			(uint64_t) region->region.memory_size,
			region->host_mem);
		fprintf(stream, "%*sunused_phy_pages: ", indent + 2, "");
		sparsebit_dump(stream, region->unused_phy_pages, 0);
	}
	fprintf(stream, "%*sMapped Virtual Pages:\n", indent, "");
	sparsebit_dump(stream, vm->vpages_mapped, indent + 2);
	fprintf(stream, "%*spgd_created: %u\n", indent, "",
		vm->pgd_created);
	if (vm->pgd_created) {
		fprintf(stream, "%*sVirtual Translation Tables:\n",
			indent + 2, "");
		virt_dump(stream, vm, indent + 4);
	}
	fprintf(stream, "%*sVCPUs:\n", indent, "");
	for (vcpu = vm->vcpu_head; vcpu; vcpu = vcpu->next)
		vcpu_dump(stream, vm, vcpu->id, indent + 2);
}

/* Known KVM exit reasons */
static struct exit_reason {
	unsigned int reason;
	const char *name;
} exit_reasons_known[] = {
	{KVM_EXIT_UNKNOWN, "UNKNOWN"},
	{KVM_EXIT_EXCEPTION, "EXCEPTION"},
	{KVM_EXIT_IO, "IO"},
	{KVM_EXIT_HYPERCALL, "HYPERCALL"},
	{KVM_EXIT_DEBUG, "DEBUG"},
	{KVM_EXIT_HLT, "HLT"},
	{KVM_EXIT_MMIO, "MMIO"},
	{KVM_EXIT_IRQ_WINDOW_OPEN, "IRQ_WINDOW_OPEN"},
	{KVM_EXIT_SHUTDOWN, "SHUTDOWN"},
	{KVM_EXIT_FAIL_ENTRY, "FAIL_ENTRY"},
	{KVM_EXIT_INTR, "INTR"},
	{KVM_EXIT_SET_TPR, "SET_TPR"},
	{KVM_EXIT_TPR_ACCESS, "TPR_ACCESS"},
	{KVM_EXIT_S390_SIEIC, "S390_SIEIC"},
	{KVM_EXIT_S390_RESET, "S390_RESET"},
	{KVM_EXIT_DCR, "DCR"},
	{KVM_EXIT_NMI, "NMI"},
	{KVM_EXIT_INTERNAL_ERROR, "INTERNAL_ERROR"},
	{KVM_EXIT_OSI, "OSI"},
	{KVM_EXIT_PAPR_HCALL, "PAPR_HCALL"},
#ifdef KVM_EXIT_MEMORY_NOT_PRESENT
	{KVM_EXIT_MEMORY_NOT_PRESENT, "MEMORY_NOT_PRESENT"},
#endif
};

/*
 * Exit Reason String
 *
 * Input Args:
 *   exit_reason - Exit reason
 *
 * Output Args: None
 *
 * Return:
 *   Constant string pointer describing the exit reason.
 *
 * Locates and returns a constant string that describes the KVM exit
 * reason given by exit_reason.  If no such string is found, a constant
 * string of "Unknown" is returned.
 */
const char *exit_reason_str(unsigned int exit_reason)
{
	unsigned int n1;

	for (n1 = 0; n1 < ARRAY_SIZE(exit_reasons_known); n1++) {
		if (exit_reason == exit_reasons_known[n1].reason)
			return exit_reasons_known[n1].name;
	}

	return "Unknown";
}

/*
 * Physical Contiguous Page Allocator
 *
 * Input Args:
 *   vm - Virtual Machine
 *   num - number of pages
 *   paddr_min - Physical address minimum
 *   memslot - Memory region to allocate page from
 *
 * Output Args: None
 *
 * Return:
 *   Starting physical address
 *
 * Within the VM specified by vm, locates a range of available physical
 * pages at or above paddr_min. If found, the pages are marked as in use
 * and their base address is returned. A TEST_ASSERT failure occurs if
 * not enough pages are available at or above paddr_min.
 */
vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
			      vm_paddr_t paddr_min, uint32_t memslot)
{
	struct userspace_mem_region *region;
	sparsebit_idx_t pg, base;

	TEST_ASSERT(num > 0, "Must allocate at least one page");

	TEST_ASSERT((paddr_min % vm->page_size) == 0, "Min physical address "
		"not divisible by page size.\n"
		"  paddr_min: 0x%lx page_size: 0x%x",
		paddr_min, vm->page_size);

	region = memslot2region(vm, memslot);
	base = pg = paddr_min >> vm->page_shift;

	do {
		for (; pg < base + num; ++pg) {
			if (!sparsebit_is_set(region->unused_phy_pages, pg)) {
				base = pg = sparsebit_next_set(region->unused_phy_pages, pg);
				break;
			}
		}
	} while (pg && pg != base + num);

	if (pg == 0) {
		fprintf(stderr, "No guest physical page available, "
			"paddr_min: 0x%lx page_size: 0x%x memslot: %u\n",
			paddr_min, vm->page_size, memslot);
		fputs("---- vm dump ----\n", stderr);
		vm_dump(stderr, vm, 2);
		abort();
	}

	for (pg = base; pg < base + num; ++pg)
		sparsebit_clear(region->unused_phy_pages, pg);

	return base * vm->page_size;
}

vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
			     uint32_t memslot)
{
	return vm_phy_pages_alloc(vm, 1, paddr_min, memslot);
}

/*
 * Address Guest Virtual to Host Virtual
 *
 * Input Args:
 *   vm - Virtual Machine
 *   gva - VM virtual address
 *
 * Output Args: None
 *
 * Return:
 *   Equivalent host virtual address
 */
void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva)
{
	return addr_gpa2hva(vm, addr_gva2gpa(vm, gva));
}