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 program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program 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 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, see <http://www.gnu.org/licenses/>. 21 */ 22 23 #include "qemu/osdep.h" 24 #include "qapi/error.h" 25 #include "cpu.h" 26 #include "internal.h" 27 #include "kvm_s390x.h" 28 #include "sysemu/kvm.h" 29 #include "sysemu/reset.h" 30 #include "qemu/timer.h" 31 #include "qemu/error-report.h" 32 #include "qemu/module.h" 33 #include "trace.h" 34 #include "qapi/visitor.h" 35 #include "qapi/qapi-types-machine.h" 36 #include "qapi/qapi-visit-run-state.h" 37 #include "sysemu/hw_accel.h" 38 #include "hw/qdev-properties.h" 39 #ifndef CONFIG_USER_ONLY 40 #include "hw/s390x/pv.h" 41 #include "hw/boards.h" 42 #include "sysemu/arch_init.h" 43 #include "sysemu/sysemu.h" 44 #include "sysemu/tcg.h" 45 #endif 46 #include "fpu/softfloat-helpers.h" 47 48 #define CR0_RESET 0xE0UL 49 #define CR14_RESET 0xC2000000UL; 50 51 static void s390_cpu_set_pc(CPUState *cs, vaddr value) 52 { 53 S390CPU *cpu = S390_CPU(cs); 54 55 cpu->env.psw.addr = value; 56 } 57 58 static bool s390_cpu_has_work(CPUState *cs) 59 { 60 S390CPU *cpu = S390_CPU(cs); 61 62 /* STOPPED cpus can never wake up */ 63 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD && 64 s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) { 65 return false; 66 } 67 68 if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) { 69 return false; 70 } 71 72 return s390_cpu_has_int(cpu); 73 } 74 75 #if !defined(CONFIG_USER_ONLY) 76 /* S390CPUClass::load_normal() */ 77 static void s390_cpu_load_normal(CPUState *s) 78 { 79 S390CPU *cpu = S390_CPU(s); 80 uint64_t spsw; 81 82 if (!s390_is_pv()) { 83 spsw = ldq_phys(s->as, 0); 84 cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL; 85 /* 86 * Invert short psw indication, so SIE will report a specification 87 * exception if it was not set. 88 */ 89 cpu->env.psw.mask ^= PSW_MASK_SHORTPSW; 90 cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR; 91 } else { 92 /* 93 * Firmware requires us to set the load state before we set 94 * the cpu to operating on protected guests. 95 */ 96 s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu); 97 } 98 s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu); 99 } 100 #endif 101 102 /* S390CPUClass::reset() */ 103 static void s390_cpu_reset(CPUState *s, cpu_reset_type type) 104 { 105 S390CPU *cpu = S390_CPU(s); 106 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu); 107 CPUS390XState *env = &cpu->env; 108 DeviceState *dev = DEVICE(s); 109 110 scc->parent_reset(dev); 111 cpu->env.sigp_order = 0; 112 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); 113 114 switch (type) { 115 case S390_CPU_RESET_CLEAR: 116 memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields)); 117 /* fall through */ 118 case S390_CPU_RESET_INITIAL: 119 /* initial reset does not clear everything! */ 120 memset(&env->start_initial_reset_fields, 0, 121 offsetof(CPUS390XState, start_normal_reset_fields) - 122 offsetof(CPUS390XState, start_initial_reset_fields)); 123 124 /* architectured initial value for Breaking-Event-Address register */ 125 env->gbea = 1; 126 127 /* architectured initial values for CR 0 and 14 */ 128 env->cregs[0] = CR0_RESET; 129 env->cregs[14] = CR14_RESET; 130 131 #if defined(CONFIG_USER_ONLY) 132 /* user mode should always be allowed to use the full FPU */ 133 env->cregs[0] |= CR0_AFP; 134 if (s390_has_feat(S390_FEAT_VECTOR)) { 135 env->cregs[0] |= CR0_VECTOR; 136 } 137 #endif 138 139 /* tininess for underflow is detected before rounding */ 140 set_float_detect_tininess(float_tininess_before_rounding, 141 &env->fpu_status); 142 /* fall through */ 143 case S390_CPU_RESET_NORMAL: 144 env->psw.mask &= ~PSW_MASK_RI; 145 memset(&env->start_normal_reset_fields, 0, 146 offsetof(CPUS390XState, end_reset_fields) - 147 offsetof(CPUS390XState, start_normal_reset_fields)); 148 149 env->pfault_token = -1UL; 150 env->bpbc = false; 151 break; 152 default: 153 g_assert_not_reached(); 154 } 155 156 /* Reset state inside the kernel that we cannot access yet from QEMU. */ 157 if (kvm_enabled()) { 158 switch (type) { 159 case S390_CPU_RESET_CLEAR: 160 kvm_s390_reset_vcpu_clear(cpu); 161 break; 162 case S390_CPU_RESET_INITIAL: 163 kvm_s390_reset_vcpu_initial(cpu); 164 break; 165 case S390_CPU_RESET_NORMAL: 166 kvm_s390_reset_vcpu_normal(cpu); 167 break; 168 } 169 } 170 } 171 172 #if !defined(CONFIG_USER_ONLY) 173 static void s390_cpu_machine_reset_cb(void *opaque) 174 { 175 S390CPU *cpu = opaque; 176 177 run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 178 } 179 #endif 180 181 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) 182 { 183 info->mach = bfd_mach_s390_64; 184 info->print_insn = print_insn_s390; 185 } 186 187 static void s390_cpu_realizefn(DeviceState *dev, Error **errp) 188 { 189 CPUState *cs = CPU(dev); 190 S390CPUClass *scc = S390_CPU_GET_CLASS(dev); 191 #if !defined(CONFIG_USER_ONLY) 192 S390CPU *cpu = S390_CPU(dev); 193 #endif 194 Error *err = NULL; 195 196 /* the model has to be realized before qemu_init_vcpu() due to kvm */ 197 s390_realize_cpu_model(cs, &err); 198 if (err) { 199 goto out; 200 } 201 202 #if !defined(CONFIG_USER_ONLY) 203 MachineState *ms = MACHINE(qdev_get_machine()); 204 unsigned int max_cpus = ms->smp.max_cpus; 205 if (cpu->env.core_id >= max_cpus) { 206 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32 207 ", maximum core-id: %d", cpu->env.core_id, 208 max_cpus - 1); 209 goto out; 210 } 211 212 if (cpu_exists(cpu->env.core_id)) { 213 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32 214 ", it already exists", cpu->env.core_id); 215 goto out; 216 } 217 218 /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */ 219 cs->cpu_index = cpu->env.core_id; 220 #endif 221 222 cpu_exec_realizefn(cs, &err); 223 if (err != NULL) { 224 goto out; 225 } 226 227 #if !defined(CONFIG_USER_ONLY) 228 qemu_register_reset(s390_cpu_machine_reset_cb, cpu); 229 #endif 230 s390_cpu_gdb_init(cs); 231 qemu_init_vcpu(cs); 232 233 /* 234 * KVM requires the initial CPU reset ioctl to be executed on the target 235 * CPU thread. CPU hotplug under single-threaded TCG will not work with 236 * run_on_cpu(), as run_on_cpu() will not work properly if called while 237 * the main thread is already running but the CPU hasn't been realized. 238 */ 239 if (kvm_enabled()) { 240 run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL); 241 } else { 242 cpu_reset(cs); 243 } 244 245 scc->parent_realize(dev, &err); 246 out: 247 error_propagate(errp, err); 248 } 249 250 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs) 251 { 252 GuestPanicInformation *panic_info; 253 S390CPU *cpu = S390_CPU(cs); 254 255 cpu_synchronize_state(cs); 256 panic_info = g_malloc0(sizeof(GuestPanicInformation)); 257 258 panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390; 259 #if !defined(CONFIG_USER_ONLY) 260 panic_info->u.s390.core = cpu->env.core_id; 261 #else 262 panic_info->u.s390.core = 0; /* sane default for non system emulation */ 263 #endif 264 panic_info->u.s390.psw_mask = cpu->env.psw.mask; 265 panic_info->u.s390.psw_addr = cpu->env.psw.addr; 266 panic_info->u.s390.reason = cpu->env.crash_reason; 267 268 return panic_info; 269 } 270 271 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v, 272 const char *name, void *opaque, 273 Error **errp) 274 { 275 CPUState *cs = CPU(obj); 276 GuestPanicInformation *panic_info; 277 278 if (!cs->crash_occurred) { 279 error_setg(errp, "No crash occurred"); 280 return; 281 } 282 283 panic_info = s390_cpu_get_crash_info(cs); 284 285 visit_type_GuestPanicInformation(v, "crash-information", &panic_info, 286 errp); 287 qapi_free_GuestPanicInformation(panic_info); 288 } 289 290 static void s390_cpu_initfn(Object *obj) 291 { 292 CPUState *cs = CPU(obj); 293 S390CPU *cpu = S390_CPU(obj); 294 295 cpu_set_cpustate_pointers(cpu); 296 cs->halted = 1; 297 cs->exception_index = EXCP_HLT; 298 object_property_add(obj, "crash-information", "GuestPanicInformation", 299 s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL); 300 s390_cpu_model_register_props(obj); 301 #if !defined(CONFIG_USER_ONLY) 302 cpu->env.tod_timer = 303 timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu); 304 cpu->env.cpu_timer = 305 timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu); 306 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu); 307 #endif 308 } 309 310 static void s390_cpu_finalize(Object *obj) 311 { 312 #if !defined(CONFIG_USER_ONLY) 313 S390CPU *cpu = S390_CPU(obj); 314 315 qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu); 316 g_free(cpu->irqstate); 317 #endif 318 } 319 320 #if !defined(CONFIG_USER_ONLY) 321 static bool disabled_wait(CPUState *cpu) 322 { 323 return cpu->halted && !(S390_CPU(cpu)->env.psw.mask & 324 (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK)); 325 } 326 327 static unsigned s390_count_running_cpus(void) 328 { 329 CPUState *cpu; 330 int nr_running = 0; 331 332 CPU_FOREACH(cpu) { 333 uint8_t state = S390_CPU(cpu)->env.cpu_state; 334 if (state == S390_CPU_STATE_OPERATING || 335 state == S390_CPU_STATE_LOAD) { 336 if (!disabled_wait(cpu)) { 337 nr_running++; 338 } 339 } 340 } 341 342 return nr_running; 343 } 344 345 unsigned int s390_cpu_halt(S390CPU *cpu) 346 { 347 CPUState *cs = CPU(cpu); 348 trace_cpu_halt(cs->cpu_index); 349 350 if (!cs->halted) { 351 cs->halted = 1; 352 cs->exception_index = EXCP_HLT; 353 } 354 355 return s390_count_running_cpus(); 356 } 357 358 void s390_cpu_unhalt(S390CPU *cpu) 359 { 360 CPUState *cs = CPU(cpu); 361 trace_cpu_unhalt(cs->cpu_index); 362 363 if (cs->halted) { 364 cs->halted = 0; 365 cs->exception_index = -1; 366 } 367 } 368 369 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu) 370 { 371 trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state); 372 373 switch (cpu_state) { 374 case S390_CPU_STATE_STOPPED: 375 case S390_CPU_STATE_CHECK_STOP: 376 /* halt the cpu for common infrastructure */ 377 s390_cpu_halt(cpu); 378 break; 379 case S390_CPU_STATE_OPERATING: 380 case S390_CPU_STATE_LOAD: 381 /* 382 * Starting a CPU with a PSW WAIT bit set: 383 * KVM: handles this internally and triggers another WAIT exit. 384 * TCG: will actually try to continue to run. Don't unhalt, will 385 * be done when the CPU actually has work (an interrupt). 386 */ 387 if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) { 388 s390_cpu_unhalt(cpu); 389 } 390 break; 391 default: 392 error_report("Requested CPU state is not a valid S390 CPU state: %u", 393 cpu_state); 394 exit(1); 395 } 396 if (kvm_enabled() && cpu->env.cpu_state != cpu_state) { 397 kvm_s390_set_cpu_state(cpu, cpu_state); 398 } 399 cpu->env.cpu_state = cpu_state; 400 401 return s390_count_running_cpus(); 402 } 403 404 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit) 405 { 406 if (kvm_enabled()) { 407 return kvm_s390_set_mem_limit(new_limit, hw_limit); 408 } 409 return 0; 410 } 411 412 void s390_set_max_pagesize(uint64_t pagesize, Error **errp) 413 { 414 if (kvm_enabled()) { 415 kvm_s390_set_max_pagesize(pagesize, errp); 416 } 417 } 418 419 void s390_cmma_reset(void) 420 { 421 if (kvm_enabled()) { 422 kvm_s390_cmma_reset(); 423 } 424 } 425 426 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, 427 int vq, bool assign) 428 { 429 if (kvm_enabled()) { 430 return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign); 431 } else { 432 return 0; 433 } 434 } 435 436 void s390_crypto_reset(void) 437 { 438 if (kvm_enabled()) { 439 kvm_s390_crypto_reset(); 440 } 441 } 442 443 void s390_enable_css_support(S390CPU *cpu) 444 { 445 if (kvm_enabled()) { 446 kvm_s390_enable_css_support(cpu); 447 } 448 } 449 #endif 450 451 static gchar *s390_gdb_arch_name(CPUState *cs) 452 { 453 return g_strdup("s390:64-bit"); 454 } 455 456 static Property s390x_cpu_properties[] = { 457 #if !defined(CONFIG_USER_ONLY) 458 DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0), 459 #endif 460 DEFINE_PROP_END_OF_LIST() 461 }; 462 463 static void s390_cpu_reset_full(DeviceState *dev) 464 { 465 CPUState *s = CPU(dev); 466 return s390_cpu_reset(s, S390_CPU_RESET_CLEAR); 467 } 468 469 static void s390_cpu_class_init(ObjectClass *oc, void *data) 470 { 471 S390CPUClass *scc = S390_CPU_CLASS(oc); 472 CPUClass *cc = CPU_CLASS(scc); 473 DeviceClass *dc = DEVICE_CLASS(oc); 474 475 device_class_set_parent_realize(dc, s390_cpu_realizefn, 476 &scc->parent_realize); 477 device_class_set_props(dc, s390x_cpu_properties); 478 dc->user_creatable = true; 479 480 device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset); 481 #if !defined(CONFIG_USER_ONLY) 482 scc->load_normal = s390_cpu_load_normal; 483 #endif 484 scc->reset = s390_cpu_reset; 485 cc->class_by_name = s390_cpu_class_by_name, 486 cc->has_work = s390_cpu_has_work; 487 #ifdef CONFIG_TCG 488 cc->do_interrupt = s390_cpu_do_interrupt; 489 #endif 490 cc->dump_state = s390_cpu_dump_state; 491 cc->get_crash_info = s390_cpu_get_crash_info; 492 cc->set_pc = s390_cpu_set_pc; 493 cc->gdb_read_register = s390_cpu_gdb_read_register; 494 cc->gdb_write_register = s390_cpu_gdb_write_register; 495 #ifndef CONFIG_USER_ONLY 496 cc->get_phys_page_debug = s390_cpu_get_phys_page_debug; 497 cc->vmsd = &vmstate_s390_cpu; 498 cc->write_elf64_note = s390_cpu_write_elf64_note; 499 #ifdef CONFIG_TCG 500 cc->cpu_exec_interrupt = s390_cpu_exec_interrupt; 501 cc->debug_excp_handler = s390x_cpu_debug_excp_handler; 502 cc->do_unaligned_access = s390x_cpu_do_unaligned_access; 503 #endif 504 #endif 505 cc->disas_set_info = s390_cpu_disas_set_info; 506 #ifdef CONFIG_TCG 507 cc->tcg_initialize = s390x_translate_init; 508 cc->tlb_fill = s390_cpu_tlb_fill; 509 #endif 510 511 cc->gdb_num_core_regs = S390_NUM_CORE_REGS; 512 cc->gdb_core_xml_file = "s390x-core64.xml"; 513 cc->gdb_arch_name = s390_gdb_arch_name; 514 515 s390_cpu_model_class_register_props(oc); 516 } 517 518 static const TypeInfo s390_cpu_type_info = { 519 .name = TYPE_S390_CPU, 520 .parent = TYPE_CPU, 521 .instance_size = sizeof(S390CPU), 522 .instance_init = s390_cpu_initfn, 523 .instance_finalize = s390_cpu_finalize, 524 .abstract = true, 525 .class_size = sizeof(S390CPUClass), 526 .class_init = s390_cpu_class_init, 527 }; 528 529 static void s390_cpu_register_types(void) 530 { 531 type_register_static(&s390_cpu_type_info); 532 } 533 534 type_init(s390_cpu_register_types) 535