1 /* 2 * QEMU S/390 CPU 3 * 4 * Copyright (c) 2009 Ulrich Hecht 5 * Copyright (c) 2011 Alexander Graf 6 * Copyright (c) 2012 SUSE LINUX Products GmbH 7 * Copyright (c) 2012 IBM Corp. 8 * 9 * This library is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this library; if not, see 21 * <http://www.gnu.org/licenses/lgpl-2.1.html> 22 * Contributions after 2012-12-11 are licensed under the terms of the 23 * GNU GPL, version 2 or (at your option) any later version. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qapi/error.h" 28 #include "cpu.h" 29 #include "internal.h" 30 #include "kvm_s390x.h" 31 #include "sysemu/kvm.h" 32 #include "qemu-common.h" 33 #include "qemu/cutils.h" 34 #include "qemu/timer.h" 35 #include "qemu/error-report.h" 36 #include "trace.h" 37 #include "qapi/visitor.h" 38 #include "exec/exec-all.h" 39 #include "hw/qdev-properties.h" 40 #ifndef CONFIG_USER_ONLY 41 #include "hw/hw.h" 42 #include "sysemu/arch_init.h" 43 #include "sysemu/sysemu.h" 44 #endif 45 46 #define CR0_RESET 0xE0UL 47 #define CR14_RESET 0xC2000000UL; 48 49 static void s390_cpu_set_pc(CPUState *cs, vaddr value) 50 { 51 S390CPU *cpu = S390_CPU(cs); 52 53 cpu->env.psw.addr = value; 54 } 55 56 static bool s390_cpu_has_work(CPUState *cs) 57 { 58 S390CPU *cpu = S390_CPU(cs); 59 60 /* STOPPED cpus can never wake up */ 61 if (s390_cpu_get_state(cpu) != CPU_STATE_LOAD && 62 s390_cpu_get_state(cpu) != CPU_STATE_OPERATING) { 63 return false; 64 } 65 66 if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) { 67 return false; 68 } 69 70 return s390_cpu_has_int(cpu); 71 } 72 73 #if !defined(CONFIG_USER_ONLY) 74 /* S390CPUClass::load_normal() */ 75 static void s390_cpu_load_normal(CPUState *s) 76 { 77 S390CPU *cpu = S390_CPU(s); 78 cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR; 79 cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64; 80 s390_cpu_set_state(CPU_STATE_OPERATING, cpu); 81 } 82 #endif 83 84 /* S390CPUClass::cpu_reset() */ 85 static void s390_cpu_reset(CPUState *s) 86 { 87 S390CPU *cpu = S390_CPU(s); 88 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); 89 CPUS390XState *env = &cpu->env; 90 91 env->pfault_token = -1UL; 92 env->bpbc = false; 93 scc->parent_reset(s); 94 cpu->env.sigp_order = 0; 95 s390_cpu_set_state(CPU_STATE_STOPPED, cpu); 96 } 97 98 /* S390CPUClass::initial_reset() */ 99 static void s390_cpu_initial_reset(CPUState *s) 100 { 101 S390CPU *cpu = S390_CPU(s); 102 CPUS390XState *env = &cpu->env; 103 int i; 104 105 s390_cpu_reset(s); 106 /* initial reset does not clear everything! */ 107 memset(&env->start_initial_reset_fields, 0, 108 offsetof(CPUS390XState, end_reset_fields) - 109 offsetof(CPUS390XState, start_initial_reset_fields)); 110 111 /* architectured initial values for CR 0 and 14 */ 112 env->cregs[0] = CR0_RESET; 113 env->cregs[14] = CR14_RESET; 114 115 /* architectured initial value for Breaking-Event-Address register */ 116 env->gbea = 1; 117 118 env->pfault_token = -1UL; 119 for (i = 0; i < ARRAY_SIZE(env->io_index); i++) { 120 env->io_index[i] = -1; 121 } 122 123 /* tininess for underflow is detected before rounding */ 124 set_float_detect_tininess(float_tininess_before_rounding, 125 &env->fpu_status); 126 127 /* Reset state inside the kernel that we cannot access yet from QEMU. */ 128 if (kvm_enabled()) { 129 kvm_s390_reset_vcpu(cpu); 130 } 131 } 132 133 /* CPUClass:reset() */ 134 static void s390_cpu_full_reset(CPUState *s) 135 { 136 S390CPU *cpu = S390_CPU(s); 137 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); 138 CPUS390XState *env = &cpu->env; 139 int i; 140 141 scc->parent_reset(s); 142 cpu->env.sigp_order = 0; 143 s390_cpu_set_state(CPU_STATE_STOPPED, cpu); 144 145 memset(env, 0, offsetof(CPUS390XState, end_reset_fields)); 146 147 /* architectured initial values for CR 0 and 14 */ 148 env->cregs[0] = CR0_RESET; 149 env->cregs[14] = CR14_RESET; 150 151 /* architectured initial value for Breaking-Event-Address register */ 152 env->gbea = 1; 153 154 env->pfault_token = -1UL; 155 for (i = 0; i < ARRAY_SIZE(env->io_index); i++) { 156 env->io_index[i] = -1; 157 } 158 159 /* tininess for underflow is detected before rounding */ 160 set_float_detect_tininess(float_tininess_before_rounding, 161 &env->fpu_status); 162 163 /* Reset state inside the kernel that we cannot access yet from QEMU. */ 164 if (kvm_enabled()) { 165 kvm_s390_reset_vcpu(cpu); 166 } 167 } 168 169 #if !defined(CONFIG_USER_ONLY) 170 static void s390_cpu_machine_reset_cb(void *opaque) 171 { 172 S390CPU *cpu = opaque; 173 174 run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 175 } 176 #endif 177 178 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) 179 { 180 info->mach = bfd_mach_s390_64; 181 info->print_insn = print_insn_s390; 182 } 183 184 static void s390_cpu_realizefn(DeviceState *dev, Error **errp) 185 { 186 CPUState *cs = CPU(dev); 187 S390CPUClass *scc = S390_CPU_GET_CLASS(dev); 188 #if !defined(CONFIG_USER_ONLY) 189 S390CPU *cpu = S390_CPU(dev); 190 #endif 191 Error *err = NULL; 192 193 /* the model has to be realized before qemu_init_vcpu() due to kvm */ 194 s390_realize_cpu_model(cs, &err); 195 if (err) { 196 goto out; 197 } 198 199 #if !defined(CONFIG_USER_ONLY) 200 if (cpu->env.core_id >= max_cpus) { 201 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32 202 ", maximum core-id: %d", cpu->env.core_id, 203 max_cpus - 1); 204 goto out; 205 } 206 207 if (cpu_exists(cpu->env.core_id)) { 208 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32 209 ", it already exists", cpu->env.core_id); 210 goto out; 211 } 212 213 /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */ 214 cs->cpu_index = cpu->env.core_id; 215 #endif 216 217 cpu_exec_realizefn(cs, &err); 218 if (err != NULL) { 219 goto out; 220 } 221 222 #if !defined(CONFIG_USER_ONLY) 223 qemu_register_reset(s390_cpu_machine_reset_cb, cpu); 224 #endif 225 s390_cpu_gdb_init(cs); 226 qemu_init_vcpu(cs); 227 #if !defined(CONFIG_USER_ONLY) 228 run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 229 #else 230 cpu_reset(cs); 231 #endif 232 233 scc->parent_realize(dev, &err); 234 out: 235 error_propagate(errp, err); 236 } 237 238 static void s390_cpu_initfn(Object *obj) 239 { 240 CPUState *cs = CPU(obj); 241 S390CPU *cpu = S390_CPU(obj); 242 CPUS390XState *env = &cpu->env; 243 #if !defined(CONFIG_USER_ONLY) 244 struct tm tm; 245 #endif 246 247 cs->env_ptr = env; 248 cs->halted = 1; 249 cs->exception_index = EXCP_HLT; 250 s390_cpu_model_register_props(obj); 251 #if !defined(CONFIG_USER_ONLY) 252 qemu_get_timedate(&tm, 0); 253 env->tod_offset = TOD_UNIX_EPOCH + 254 (time2tod(mktimegm(&tm)) * 1000000000ULL); 255 env->tod_basetime = 0; 256 env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu); 257 env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu); 258 s390_cpu_set_state(CPU_STATE_STOPPED, cpu); 259 #endif 260 } 261 262 static void s390_cpu_finalize(Object *obj) 263 { 264 #if !defined(CONFIG_USER_ONLY) 265 S390CPU *cpu = S390_CPU(obj); 266 267 qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu); 268 g_free(cpu->irqstate); 269 #endif 270 } 271 272 #if !defined(CONFIG_USER_ONLY) 273 static bool disabled_wait(CPUState *cpu) 274 { 275 return cpu->halted && !(S390_CPU(cpu)->env.psw.mask & 276 (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK)); 277 } 278 279 static unsigned s390_count_running_cpus(void) 280 { 281 CPUState *cpu; 282 int nr_running = 0; 283 284 CPU_FOREACH(cpu) { 285 uint8_t state = S390_CPU(cpu)->env.cpu_state; 286 if (state == CPU_STATE_OPERATING || 287 state == CPU_STATE_LOAD) { 288 if (!disabled_wait(cpu)) { 289 nr_running++; 290 } 291 } 292 } 293 294 return nr_running; 295 } 296 297 unsigned int s390_cpu_halt(S390CPU *cpu) 298 { 299 CPUState *cs = CPU(cpu); 300 trace_cpu_halt(cs->cpu_index); 301 302 if (!cs->halted) { 303 cs->halted = 1; 304 cs->exception_index = EXCP_HLT; 305 } 306 307 return s390_count_running_cpus(); 308 } 309 310 void s390_cpu_unhalt(S390CPU *cpu) 311 { 312 CPUState *cs = CPU(cpu); 313 trace_cpu_unhalt(cs->cpu_index); 314 315 if (cs->halted) { 316 cs->halted = 0; 317 cs->exception_index = -1; 318 } 319 } 320 321 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu) 322 { 323 trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state); 324 325 switch (cpu_state) { 326 case CPU_STATE_STOPPED: 327 case CPU_STATE_CHECK_STOP: 328 /* halt the cpu for common infrastructure */ 329 s390_cpu_halt(cpu); 330 break; 331 case CPU_STATE_OPERATING: 332 case CPU_STATE_LOAD: 333 /* 334 * Starting a CPU with a PSW WAIT bit set: 335 * KVM: handles this internally and triggers another WAIT exit. 336 * TCG: will actually try to continue to run. Don't unhalt, will 337 * be done when the CPU actually has work (an interrupt). 338 */ 339 if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) { 340 s390_cpu_unhalt(cpu); 341 } 342 break; 343 default: 344 error_report("Requested CPU state is not a valid S390 CPU state: %u", 345 cpu_state); 346 exit(1); 347 } 348 if (kvm_enabled() && cpu->env.cpu_state != cpu_state) { 349 kvm_s390_set_cpu_state(cpu, cpu_state); 350 } 351 cpu->env.cpu_state = cpu_state; 352 353 return s390_count_running_cpus(); 354 } 355 356 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low) 357 { 358 int r = 0; 359 360 if (kvm_enabled()) { 361 r = kvm_s390_get_clock_ext(tod_high, tod_low); 362 if (r == -ENXIO) { 363 return kvm_s390_get_clock(tod_high, tod_low); 364 } 365 } else { 366 /* Fixme TCG */ 367 *tod_high = 0; 368 *tod_low = 0; 369 } 370 371 return r; 372 } 373 374 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low) 375 { 376 int r = 0; 377 378 if (kvm_enabled()) { 379 r = kvm_s390_set_clock_ext(tod_high, tod_low); 380 if (r == -ENXIO) { 381 return kvm_s390_set_clock(tod_high, tod_low); 382 } 383 } 384 /* Fixme TCG */ 385 return r; 386 } 387 388 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit) 389 { 390 if (kvm_enabled()) { 391 return kvm_s390_set_mem_limit(new_limit, hw_limit); 392 } 393 return 0; 394 } 395 396 void s390_cmma_reset(void) 397 { 398 if (kvm_enabled()) { 399 kvm_s390_cmma_reset(); 400 } 401 } 402 403 int s390_get_memslot_count(void) 404 { 405 if (kvm_enabled()) { 406 return kvm_s390_get_memslot_count(); 407 } else { 408 return MAX_AVAIL_SLOTS; 409 } 410 } 411 412 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, 413 int vq, bool assign) 414 { 415 if (kvm_enabled()) { 416 return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign); 417 } else { 418 return 0; 419 } 420 } 421 422 void s390_crypto_reset(void) 423 { 424 if (kvm_enabled()) { 425 kvm_s390_crypto_reset(); 426 } 427 } 428 429 bool s390_get_squash_mcss(void) 430 { 431 if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss", 432 NULL)) { 433 return true; 434 } 435 436 return false; 437 } 438 439 void s390_enable_css_support(S390CPU *cpu) 440 { 441 if (kvm_enabled()) { 442 kvm_s390_enable_css_support(cpu); 443 } 444 } 445 #endif 446 447 static gchar *s390_gdb_arch_name(CPUState *cs) 448 { 449 return g_strdup("s390:64-bit"); 450 } 451 452 static Property s390x_cpu_properties[] = { 453 #if !defined(CONFIG_USER_ONLY) 454 DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0), 455 #endif 456 DEFINE_PROP_END_OF_LIST() 457 }; 458 459 static void s390_cpu_class_init(ObjectClass *oc, void *data) 460 { 461 S390CPUClass *scc = S390_CPU_CLASS(oc); 462 CPUClass *cc = CPU_CLASS(scc); 463 DeviceClass *dc = DEVICE_CLASS(oc); 464 465 device_class_set_parent_realize(dc, s390_cpu_realizefn, 466 &scc->parent_realize); 467 dc->props = s390x_cpu_properties; 468 dc->user_creatable = true; 469 470 scc->parent_reset = cc->reset; 471 #if !defined(CONFIG_USER_ONLY) 472 scc->load_normal = s390_cpu_load_normal; 473 #endif 474 scc->cpu_reset = s390_cpu_reset; 475 scc->initial_cpu_reset = s390_cpu_initial_reset; 476 cc->reset = s390_cpu_full_reset; 477 cc->class_by_name = s390_cpu_class_by_name, 478 cc->has_work = s390_cpu_has_work; 479 #ifdef CONFIG_TCG 480 cc->do_interrupt = s390_cpu_do_interrupt; 481 #endif 482 cc->dump_state = s390_cpu_dump_state; 483 cc->set_pc = s390_cpu_set_pc; 484 cc->gdb_read_register = s390_cpu_gdb_read_register; 485 cc->gdb_write_register = s390_cpu_gdb_write_register; 486 #ifdef CONFIG_USER_ONLY 487 cc->handle_mmu_fault = s390_cpu_handle_mmu_fault; 488 #else 489 cc->get_phys_page_debug = s390_cpu_get_phys_page_debug; 490 cc->vmsd = &vmstate_s390_cpu; 491 cc->write_elf64_note = s390_cpu_write_elf64_note; 492 #ifdef CONFIG_TCG 493 cc->cpu_exec_interrupt = s390_cpu_exec_interrupt; 494 cc->debug_excp_handler = s390x_cpu_debug_excp_handler; 495 cc->do_unaligned_access = s390x_cpu_do_unaligned_access; 496 #endif 497 #endif 498 cc->disas_set_info = s390_cpu_disas_set_info; 499 #ifdef CONFIG_TCG 500 cc->tcg_initialize = s390x_translate_init; 501 #endif 502 503 cc->gdb_num_core_regs = S390_NUM_CORE_REGS; 504 cc->gdb_core_xml_file = "s390x-core64.xml"; 505 cc->gdb_arch_name = s390_gdb_arch_name; 506 507 s390_cpu_model_class_register_props(oc); 508 } 509 510 static const TypeInfo s390_cpu_type_info = { 511 .name = TYPE_S390_CPU, 512 .parent = TYPE_CPU, 513 .instance_size = sizeof(S390CPU), 514 .instance_init = s390_cpu_initfn, 515 .instance_finalize = s390_cpu_finalize, 516 .abstract = true, 517 .class_size = sizeof(S390CPUClass), 518 .class_init = s390_cpu_class_init, 519 }; 520 521 static void s390_cpu_register_types(void) 522 { 523 type_register_static(&s390_cpu_type_info); 524 } 525 526 type_init(s390_cpu_register_types) 527