arm-cpu-features.c (23733B)
1 /* 2 * Arm CPU feature test cases 3 * 4 * Copyright (c) 2019 Red Hat Inc. 5 * Authors: 6 * Andrew Jones <drjones@redhat.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2 or later. 9 * See the COPYING file in the top-level directory. 10 */ 11 #include "qemu/osdep.h" 12 #include "qemu/bitops.h" 13 #include "libqtest.h" 14 #include "qapi/qmp/qdict.h" 15 #include "qapi/qmp/qjson.h" 16 17 /* 18 * We expect the SVE max-vq to be 16. Also it must be <= 64 19 * for our test code, otherwise 'vls' can't just be a uint64_t. 20 */ 21 #define SVE_MAX_VQ 16 22 23 #define MACHINE "-machine virt,gic-version=max -accel tcg " 24 #define MACHINE_KVM "-machine virt,gic-version=max -accel kvm -accel tcg " 25 #define QUERY_HEAD "{ 'execute': 'query-cpu-model-expansion', " \ 26 " 'arguments': { 'type': 'full', " 27 #define QUERY_TAIL "}}" 28 29 static QDict *do_query_no_props(QTestState *qts, const char *cpu_type) 30 { 31 return qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s }" 32 QUERY_TAIL, cpu_type); 33 } 34 35 static QDict *do_query(QTestState *qts, const char *cpu_type, 36 const char *fmt, ...) 37 { 38 QDict *resp; 39 40 if (fmt) { 41 QDict *args; 42 va_list ap; 43 44 va_start(ap, fmt); 45 args = qdict_from_vjsonf_nofail(fmt, ap); 46 va_end(ap); 47 48 resp = qtest_qmp(qts, QUERY_HEAD "'model': { 'name': %s, " 49 "'props': %p }" 50 QUERY_TAIL, cpu_type, args); 51 } else { 52 resp = do_query_no_props(qts, cpu_type); 53 } 54 55 return resp; 56 } 57 58 static const char *resp_get_error(QDict *resp) 59 { 60 QDict *qdict; 61 62 g_assert(resp); 63 64 qdict = qdict_get_qdict(resp, "error"); 65 if (qdict) { 66 return qdict_get_str(qdict, "desc"); 67 } 68 69 return NULL; 70 } 71 72 #define assert_error(qts, cpu_type, expected_error, fmt, ...) \ 73 ({ \ 74 QDict *_resp; \ 75 const char *_error; \ 76 \ 77 _resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__); \ 78 g_assert(_resp); \ 79 _error = resp_get_error(_resp); \ 80 g_assert(_error); \ 81 g_assert(g_str_equal(_error, expected_error)); \ 82 qobject_unref(_resp); \ 83 }) 84 85 static bool resp_has_props(QDict *resp) 86 { 87 QDict *qdict; 88 89 g_assert(resp); 90 91 if (!qdict_haskey(resp, "return")) { 92 return false; 93 } 94 qdict = qdict_get_qdict(resp, "return"); 95 96 if (!qdict_haskey(qdict, "model")) { 97 return false; 98 } 99 qdict = qdict_get_qdict(qdict, "model"); 100 101 return qdict_haskey(qdict, "props"); 102 } 103 104 static QDict *resp_get_props(QDict *resp) 105 { 106 QDict *qdict; 107 108 g_assert(resp); 109 g_assert(resp_has_props(resp)); 110 111 qdict = qdict_get_qdict(resp, "return"); 112 qdict = qdict_get_qdict(qdict, "model"); 113 qdict = qdict_get_qdict(qdict, "props"); 114 115 return qdict; 116 } 117 118 static bool resp_get_feature(QDict *resp, const char *feature) 119 { 120 QDict *props; 121 122 g_assert(resp); 123 g_assert(resp_has_props(resp)); 124 props = resp_get_props(resp); 125 g_assert(qdict_get(props, feature)); 126 return qdict_get_bool(props, feature); 127 } 128 129 #define assert_has_feature(qts, cpu_type, feature) \ 130 ({ \ 131 QDict *_resp = do_query_no_props(qts, cpu_type); \ 132 g_assert(_resp); \ 133 g_assert(resp_has_props(_resp)); \ 134 g_assert(qdict_get(resp_get_props(_resp), feature)); \ 135 qobject_unref(_resp); \ 136 }) 137 138 #define assert_has_not_feature(qts, cpu_type, feature) \ 139 ({ \ 140 QDict *_resp = do_query_no_props(qts, cpu_type); \ 141 g_assert(_resp); \ 142 g_assert(!resp_has_props(_resp) || \ 143 !qdict_get(resp_get_props(_resp), feature)); \ 144 qobject_unref(_resp); \ 145 }) 146 147 #define resp_assert_feature(resp, feature, expected_value) \ 148 ({ \ 149 QDict *_props; \ 150 \ 151 g_assert(_resp); \ 152 g_assert(resp_has_props(_resp)); \ 153 _props = resp_get_props(_resp); \ 154 g_assert(qdict_get(_props, feature)); \ 155 g_assert(qdict_get_bool(_props, feature) == (expected_value)); \ 156 }) 157 158 #define assert_feature(qts, cpu_type, feature, expected_value) \ 159 ({ \ 160 QDict *_resp; \ 161 \ 162 _resp = do_query_no_props(qts, cpu_type); \ 163 g_assert(_resp); \ 164 resp_assert_feature(_resp, feature, expected_value); \ 165 qobject_unref(_resp); \ 166 }) 167 168 #define assert_set_feature(qts, cpu_type, feature, value) \ 169 ({ \ 170 const char *_fmt = (value) ? "{ %s: true }" : "{ %s: false }"; \ 171 QDict *_resp; \ 172 \ 173 _resp = do_query(qts, cpu_type, _fmt, feature); \ 174 g_assert(_resp); \ 175 resp_assert_feature(_resp, feature, value); \ 176 qobject_unref(_resp); \ 177 }) 178 179 #define assert_has_feature_enabled(qts, cpu_type, feature) \ 180 assert_feature(qts, cpu_type, feature, true) 181 182 #define assert_has_feature_disabled(qts, cpu_type, feature) \ 183 assert_feature(qts, cpu_type, feature, false) 184 185 static void assert_type_full(QTestState *qts) 186 { 187 const char *error; 188 QDict *resp; 189 190 resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', " 191 "'arguments': { 'type': 'static', " 192 "'model': { 'name': 'foo' }}}"); 193 g_assert(resp); 194 error = resp_get_error(resp); 195 g_assert(error); 196 g_assert(g_str_equal(error, 197 "The requested expansion type is not supported")); 198 qobject_unref(resp); 199 } 200 201 static void assert_bad_props(QTestState *qts, const char *cpu_type) 202 { 203 const char *error; 204 QDict *resp; 205 206 resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', " 207 "'arguments': { 'type': 'full', " 208 "'model': { 'name': %s, " 209 "'props': false }}}", 210 cpu_type); 211 g_assert(resp); 212 error = resp_get_error(resp); 213 g_assert(error); 214 g_assert(g_str_equal(error, 215 "Invalid parameter type for 'props', expected: dict")); 216 qobject_unref(resp); 217 } 218 219 static uint64_t resp_get_sve_vls(QDict *resp) 220 { 221 QDict *props; 222 const QDictEntry *e; 223 uint64_t vls = 0; 224 int n = 0; 225 226 g_assert(resp); 227 g_assert(resp_has_props(resp)); 228 229 props = resp_get_props(resp); 230 231 for (e = qdict_first(props); e; e = qdict_next(props, e)) { 232 if (strlen(e->key) > 3 && !strncmp(e->key, "sve", 3) && 233 g_ascii_isdigit(e->key[3])) { 234 char *endptr; 235 int bits; 236 237 bits = g_ascii_strtoll(&e->key[3], &endptr, 10); 238 if (!bits || *endptr != '\0') { 239 continue; 240 } 241 242 if (qdict_get_bool(props, e->key)) { 243 vls |= BIT_ULL((bits / 128) - 1); 244 } 245 ++n; 246 } 247 } 248 249 g_assert(n == SVE_MAX_VQ); 250 251 return vls; 252 } 253 254 #define assert_sve_vls(qts, cpu_type, expected_vls, fmt, ...) \ 255 ({ \ 256 QDict *_resp = do_query(qts, cpu_type, fmt, ##__VA_ARGS__); \ 257 g_assert(_resp); \ 258 g_assert(resp_has_props(_resp)); \ 259 g_assert(resp_get_sve_vls(_resp) == expected_vls); \ 260 qobject_unref(_resp); \ 261 }) 262 263 static void sve_tests_default(QTestState *qts, const char *cpu_type) 264 { 265 /* 266 * With no sve-max-vq or sve<N> properties on the command line 267 * the default is to have all vector lengths enabled. This also 268 * tests that 'sve' is 'on' by default. 269 */ 270 assert_sve_vls(qts, cpu_type, BIT_ULL(SVE_MAX_VQ) - 1, NULL); 271 272 /* With SVE off, all vector lengths should also be off. */ 273 assert_sve_vls(qts, cpu_type, 0, "{ 'sve': false }"); 274 275 /* With SVE on, we must have at least one vector length enabled. */ 276 assert_error(qts, cpu_type, "cannot disable sve128", "{ 'sve128': false }"); 277 278 /* Basic enable/disable tests. */ 279 assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve384': true }"); 280 assert_sve_vls(qts, cpu_type, ((BIT_ULL(SVE_MAX_VQ) - 1) & ~BIT_ULL(2)), 281 "{ 'sve384': false }"); 282 283 /* 284 * --------------------------------------------------------------------- 285 * power-of-two(vq) all-power- can can 286 * of-two(< vq) enable disable 287 * --------------------------------------------------------------------- 288 * vq < max_vq no MUST* yes yes 289 * vq < max_vq yes MUST* yes no 290 * --------------------------------------------------------------------- 291 * vq == max_vq n/a MUST* yes** yes** 292 * --------------------------------------------------------------------- 293 * vq > max_vq n/a no no yes 294 * vq > max_vq n/a yes yes yes 295 * --------------------------------------------------------------------- 296 * 297 * [*] "MUST" means this requirement must already be satisfied, 298 * otherwise 'max_vq' couldn't itself be enabled. 299 * 300 * [**] Not testable with the QMP interface, only with the command line. 301 */ 302 303 /* max_vq := 8 */ 304 assert_sve_vls(qts, cpu_type, 0x8b, "{ 'sve1024': true }"); 305 306 /* max_vq := 8, vq < max_vq, !power-of-two(vq) */ 307 assert_sve_vls(qts, cpu_type, 0x8f, 308 "{ 'sve1024': true, 'sve384': true }"); 309 assert_sve_vls(qts, cpu_type, 0x8b, 310 "{ 'sve1024': true, 'sve384': false }"); 311 312 /* max_vq := 8, vq < max_vq, power-of-two(vq) */ 313 assert_sve_vls(qts, cpu_type, 0x8b, 314 "{ 'sve1024': true, 'sve256': true }"); 315 assert_error(qts, cpu_type, "cannot disable sve256", 316 "{ 'sve1024': true, 'sve256': false }"); 317 318 /* max_vq := 3, vq > max_vq, !all-power-of-two(< vq) */ 319 assert_error(qts, cpu_type, "cannot disable sve512", 320 "{ 'sve384': true, 'sve512': false, 'sve640': true }"); 321 322 /* 323 * We can disable power-of-two vector lengths when all larger lengths 324 * are also disabled. We only need to disable the power-of-two length, 325 * as all non-enabled larger lengths will then be auto-disabled. 326 */ 327 assert_sve_vls(qts, cpu_type, 0x7, "{ 'sve512': false }"); 328 329 /* max_vq := 3, vq > max_vq, all-power-of-two(< vq) */ 330 assert_sve_vls(qts, cpu_type, 0x1f, 331 "{ 'sve384': true, 'sve512': true, 'sve640': true }"); 332 assert_sve_vls(qts, cpu_type, 0xf, 333 "{ 'sve384': true, 'sve512': true, 'sve640': false }"); 334 } 335 336 static void sve_tests_sve_max_vq_8(const void *data) 337 { 338 QTestState *qts; 339 340 qts = qtest_init(MACHINE "-cpu max,sve-max-vq=8"); 341 342 assert_sve_vls(qts, "max", BIT_ULL(8) - 1, NULL); 343 344 /* 345 * Disabling the max-vq set by sve-max-vq is not allowed, but 346 * of course enabling it is OK. 347 */ 348 assert_error(qts, "max", "cannot disable sve1024", "{ 'sve1024': false }"); 349 assert_sve_vls(qts, "max", 0xff, "{ 'sve1024': true }"); 350 351 /* 352 * Enabling anything larger than max-vq set by sve-max-vq is not 353 * allowed, but of course disabling everything larger is OK. 354 */ 355 assert_error(qts, "max", "cannot enable sve1152", "{ 'sve1152': true }"); 356 assert_sve_vls(qts, "max", 0xff, "{ 'sve1152': false }"); 357 358 /* 359 * We can enable/disable non power-of-two lengths smaller than the 360 * max-vq set by sve-max-vq, but, while we can enable power-of-two 361 * lengths, we can't disable them. 362 */ 363 assert_sve_vls(qts, "max", 0xff, "{ 'sve384': true }"); 364 assert_sve_vls(qts, "max", 0xfb, "{ 'sve384': false }"); 365 assert_sve_vls(qts, "max", 0xff, "{ 'sve256': true }"); 366 assert_error(qts, "max", "cannot disable sve256", "{ 'sve256': false }"); 367 368 qtest_quit(qts); 369 } 370 371 static void sve_tests_sve_off(const void *data) 372 { 373 QTestState *qts; 374 375 qts = qtest_init(MACHINE "-cpu max,sve=off"); 376 377 /* SVE is off, so the map should be empty. */ 378 assert_sve_vls(qts, "max", 0, NULL); 379 380 /* The map stays empty even if we turn lengths off. */ 381 assert_sve_vls(qts, "max", 0, "{ 'sve128': false }"); 382 383 /* It's an error to enable lengths when SVE is off. */ 384 assert_error(qts, "max", "cannot enable sve128", "{ 'sve128': true }"); 385 386 /* With SVE re-enabled we should get all vector lengths enabled. */ 387 assert_sve_vls(qts, "max", BIT_ULL(SVE_MAX_VQ) - 1, "{ 'sve': true }"); 388 389 /* Or enable SVE with just specific vector lengths. */ 390 assert_sve_vls(qts, "max", 0x3, 391 "{ 'sve': true, 'sve128': true, 'sve256': true }"); 392 393 qtest_quit(qts); 394 } 395 396 static void sve_tests_sve_off_kvm(const void *data) 397 { 398 QTestState *qts; 399 400 qts = qtest_init(MACHINE_KVM "-cpu max,sve=off"); 401 402 /* 403 * We don't know if this host supports SVE so we don't 404 * attempt to test enabling anything. We only test that 405 * everything is disabled (as it should be with sve=off) 406 * and that using sve<N>=off to explicitly disable vector 407 * lengths is OK too. 408 */ 409 assert_sve_vls(qts, "max", 0, NULL); 410 assert_sve_vls(qts, "max", 0, "{ 'sve128': false }"); 411 412 qtest_quit(qts); 413 } 414 415 static void pauth_tests_default(QTestState *qts, const char *cpu_type) 416 { 417 assert_has_feature_enabled(qts, cpu_type, "pauth"); 418 assert_has_feature_disabled(qts, cpu_type, "pauth-impdef"); 419 assert_set_feature(qts, cpu_type, "pauth", false); 420 assert_set_feature(qts, cpu_type, "pauth", true); 421 assert_set_feature(qts, cpu_type, "pauth-impdef", true); 422 assert_set_feature(qts, cpu_type, "pauth-impdef", false); 423 assert_error(qts, cpu_type, "cannot enable pauth-impdef without pauth", 424 "{ 'pauth': false, 'pauth-impdef': true }"); 425 } 426 427 static void test_query_cpu_model_expansion(const void *data) 428 { 429 QTestState *qts; 430 431 qts = qtest_init(MACHINE "-cpu max"); 432 433 /* Test common query-cpu-model-expansion input validation */ 434 assert_type_full(qts); 435 assert_bad_props(qts, "max"); 436 assert_error(qts, "foo", "The CPU type 'foo' is not a recognized " 437 "ARM CPU type", NULL); 438 assert_error(qts, "max", "Parameter 'not-a-prop' is unexpected", 439 "{ 'not-a-prop': false }"); 440 assert_error(qts, "host", "The CPU type 'host' requires KVM", NULL); 441 442 /* Test expected feature presence/absence for some cpu types */ 443 assert_has_feature_enabled(qts, "cortex-a15", "pmu"); 444 assert_has_not_feature(qts, "cortex-a15", "aarch64"); 445 446 /* Enabling and disabling pmu should always work. */ 447 assert_has_feature_enabled(qts, "max", "pmu"); 448 assert_set_feature(qts, "max", "pmu", false); 449 assert_set_feature(qts, "max", "pmu", true); 450 451 assert_has_not_feature(qts, "max", "kvm-no-adjvtime"); 452 assert_has_not_feature(qts, "max", "kvm-steal-time"); 453 454 if (g_str_equal(qtest_get_arch(), "aarch64")) { 455 assert_has_feature_enabled(qts, "max", "aarch64"); 456 assert_has_feature_enabled(qts, "max", "sve"); 457 assert_has_feature_enabled(qts, "max", "sve128"); 458 assert_has_feature_enabled(qts, "cortex-a57", "pmu"); 459 assert_has_feature_enabled(qts, "cortex-a57", "aarch64"); 460 461 assert_has_feature_enabled(qts, "a64fx", "pmu"); 462 assert_has_feature_enabled(qts, "a64fx", "aarch64"); 463 /* 464 * A64FX does not support any other vector lengths besides those 465 * that are enabled by default(128bit, 256bits, 512bit). 466 */ 467 assert_has_feature_enabled(qts, "a64fx", "sve"); 468 assert_sve_vls(qts, "a64fx", 0xb, NULL); 469 assert_error(qts, "a64fx", "cannot enable sve384", 470 "{ 'sve384': true }"); 471 assert_error(qts, "a64fx", "cannot enable sve640", 472 "{ 'sve640': true }"); 473 474 sve_tests_default(qts, "max"); 475 pauth_tests_default(qts, "max"); 476 477 /* Test that features that depend on KVM generate errors without. */ 478 assert_error(qts, "max", 479 "'aarch64' feature cannot be disabled " 480 "unless KVM is enabled and 32-bit EL1 " 481 "is supported", 482 "{ 'aarch64': false }"); 483 } 484 485 qtest_quit(qts); 486 } 487 488 static void test_query_cpu_model_expansion_kvm(const void *data) 489 { 490 QTestState *qts; 491 492 qts = qtest_init(MACHINE_KVM "-cpu max"); 493 494 /* Enabling and disabling kvm-no-adjvtime should always work. */ 495 assert_has_feature_disabled(qts, "host", "kvm-no-adjvtime"); 496 assert_set_feature(qts, "host", "kvm-no-adjvtime", true); 497 assert_set_feature(qts, "host", "kvm-no-adjvtime", false); 498 499 if (g_str_equal(qtest_get_arch(), "aarch64")) { 500 bool kvm_supports_steal_time; 501 bool kvm_supports_sve; 502 char max_name[8], name[8]; 503 uint32_t max_vq, vq; 504 uint64_t vls; 505 QDict *resp; 506 char *error; 507 508 assert_error(qts, "cortex-a15", 509 "We cannot guarantee the CPU type 'cortex-a15' works " 510 "with KVM on this host", NULL); 511 512 assert_has_feature_enabled(qts, "host", "aarch64"); 513 514 /* Enabling and disabling pmu should always work. */ 515 assert_has_feature_enabled(qts, "host", "pmu"); 516 assert_set_feature(qts, "host", "pmu", false); 517 assert_set_feature(qts, "host", "pmu", true); 518 519 /* 520 * Some features would be enabled by default, but they're disabled 521 * because this instance of KVM doesn't support them. Test that the 522 * features are present, and, when enabled, issue further tests. 523 */ 524 assert_has_feature(qts, "host", "kvm-steal-time"); 525 assert_has_feature(qts, "host", "sve"); 526 527 resp = do_query_no_props(qts, "host"); 528 kvm_supports_steal_time = resp_get_feature(resp, "kvm-steal-time"); 529 kvm_supports_sve = resp_get_feature(resp, "sve"); 530 vls = resp_get_sve_vls(resp); 531 qobject_unref(resp); 532 533 if (kvm_supports_steal_time) { 534 /* If we have steal-time then we should be able to toggle it. */ 535 assert_set_feature(qts, "host", "kvm-steal-time", false); 536 assert_set_feature(qts, "host", "kvm-steal-time", true); 537 } 538 539 if (kvm_supports_sve) { 540 g_assert(vls != 0); 541 max_vq = 64 - __builtin_clzll(vls); 542 sprintf(max_name, "sve%u", max_vq * 128); 543 544 /* Enabling a supported length is of course fine. */ 545 assert_sve_vls(qts, "host", vls, "{ %s: true }", max_name); 546 547 /* Get the next supported length smaller than max-vq. */ 548 vq = 64 - __builtin_clzll(vls & ~BIT_ULL(max_vq - 1)); 549 if (vq) { 550 /* 551 * We have at least one length smaller than max-vq, 552 * so we can disable max-vq. 553 */ 554 assert_sve_vls(qts, "host", (vls & ~BIT_ULL(max_vq - 1)), 555 "{ %s: false }", max_name); 556 557 /* 558 * Smaller, supported vector lengths cannot be disabled 559 * unless all larger, supported vector lengths are also 560 * disabled. 561 */ 562 sprintf(name, "sve%u", vq * 128); 563 error = g_strdup_printf("cannot disable %s", name); 564 assert_error(qts, "host", error, 565 "{ %s: true, %s: false }", 566 max_name, name); 567 g_free(error); 568 } 569 570 /* 571 * The smallest, supported vector length is required, because 572 * we need at least one vector length enabled. 573 */ 574 vq = __builtin_ffsll(vls); 575 sprintf(name, "sve%u", vq * 128); 576 error = g_strdup_printf("cannot disable %s", name); 577 assert_error(qts, "host", error, "{ %s: false }", name); 578 g_free(error); 579 580 /* Get an unsupported length. */ 581 for (vq = 1; vq <= max_vq; ++vq) { 582 if (!(vls & BIT_ULL(vq - 1))) { 583 break; 584 } 585 } 586 if (vq <= SVE_MAX_VQ) { 587 sprintf(name, "sve%u", vq * 128); 588 error = g_strdup_printf("cannot enable %s", name); 589 assert_error(qts, "host", error, "{ %s: true }", name); 590 g_free(error); 591 } 592 } else { 593 g_assert(vls == 0); 594 } 595 } else { 596 assert_has_not_feature(qts, "host", "aarch64"); 597 assert_has_not_feature(qts, "host", "pmu"); 598 assert_has_not_feature(qts, "host", "sve"); 599 assert_has_not_feature(qts, "host", "kvm-steal-time"); 600 } 601 602 qtest_quit(qts); 603 } 604 605 int main(int argc, char **argv) 606 { 607 g_test_init(&argc, &argv, NULL); 608 609 qtest_add_data_func("/arm/query-cpu-model-expansion", 610 NULL, test_query_cpu_model_expansion); 611 612 /* 613 * For now we only run KVM specific tests with AArch64 QEMU in 614 * order avoid attempting to run an AArch32 QEMU with KVM on 615 * AArch64 hosts. That won't work and isn't easy to detect. 616 */ 617 if (g_str_equal(qtest_get_arch(), "aarch64") && qtest_has_accel("kvm")) { 618 /* 619 * This tests target the 'host' CPU type, so register it only if 620 * KVM is available. 621 */ 622 qtest_add_data_func("/arm/kvm/query-cpu-model-expansion", 623 NULL, test_query_cpu_model_expansion_kvm); 624 } 625 626 if (g_str_equal(qtest_get_arch(), "aarch64")) { 627 qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-max-vq-8", 628 NULL, sve_tests_sve_max_vq_8); 629 qtest_add_data_func("/arm/max/query-cpu-model-expansion/sve-off", 630 NULL, sve_tests_sve_off); 631 qtest_add_data_func("/arm/kvm/query-cpu-model-expansion/sve-off", 632 NULL, sve_tests_sve_off_kvm); 633 } 634 635 return g_test_run(); 636 }