target/s390x/cpu.c

   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/timer.h"
  34 #include "qemu/error-report.h"
  35 #include "trace.h"
  36 #include "qapi/visitor.h"
  37 #include "qapi/qapi-visit-misc.h"
  38 #include "qapi/qapi-visit-run-state.h"
  39 #include "sysemu/hw_accel.h"
  40 #include "hw/qdev-properties.h"
  41 #ifndef CONFIG_USER_ONLY
  42 #include "hw/hw.h"
  43 #include "sysemu/arch_init.h"
  44 #include "sysemu/sysemu.h"
  45 #endif
  46 #include "fpu/softfloat.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     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  81     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  82     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  83 }
  84 #endif
  85
  86 /* S390CPUClass::cpu_reset() */
  87 static void s390_cpu_reset(CPUState *s)
  88 {
  89     S390CPU *cpu = S390_CPU(s);
  90     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  91     CPUS390XState *env = &cpu->env;
  92
  93     env->pfault_token = -1UL;
  94     env->bpbc = false;
  95     scc->parent_reset(s);
  96     cpu->env.sigp_order = 0;
  97     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
  98 }
  99
 100 /* S390CPUClass::initial_reset() */
 101 static void s390_cpu_initial_reset(CPUState *s)
 102 {
 103     S390CPU *cpu = S390_CPU(s);
 104     CPUS390XState *env = &cpu->env;
 105
 106     s390_cpu_reset(s);
 107     /* initial reset does not clear everything! */
 108     memset(&env->start_initial_reset_fields, 0,
 109         offsetof(CPUS390XState, end_reset_fields) -
 110         offsetof(CPUS390XState, start_initial_reset_fields));
 111
 112     /* architectured initial values for CR 0 and 14 */
 113     env->cregs[0] = CR0_RESET;
 114     env->cregs[14] = CR14_RESET;
 115
 116     /* architectured initial value for Breaking-Event-Address register */
 117     env->gbea = 1;
 118
 119     env->pfault_token = -1UL;
 120
 121     /* tininess for underflow is detected before rounding */
 122     set_float_detect_tininess(float_tininess_before_rounding,
 123                               &env->fpu_status);
 124
 125     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 126     if (kvm_enabled()) {
 127         kvm_s390_reset_vcpu(cpu);
 128     }
 129 }
 130
 131 /* CPUClass:reset() */
 132 static void s390_cpu_full_reset(CPUState *s)
 133 {
 134     S390CPU *cpu = S390_CPU(s);
 135     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 136     CPUS390XState *env = &cpu->env;
 137
 138     scc->parent_reset(s);
 139     cpu->env.sigp_order = 0;
 140     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 141
 142     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 143
 144     /* architectured initial values for CR 0 and 14 */
 145     env->cregs[0] = CR0_RESET;
 146     env->cregs[14] = CR14_RESET;
 147
 148 #if defined(CONFIG_USER_ONLY)
 149     /* user mode should always be allowed to use the full FPU */
 150     env->cregs[0] |= CR0_AFP;
 151 #endif
 152
 153     /* architectured initial value for Breaking-Event-Address register */
 154     env->gbea = 1;
 155
 156     env->pfault_token = -1UL;
 157
 158     /* tininess for underflow is detected before rounding */
 159     set_float_detect_tininess(float_tininess_before_rounding,
 160                               &env->fpu_status);
 161
 162     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 163     if (kvm_enabled()) {
 164         kvm_s390_reset_vcpu(cpu);
 165     }
 166 }
 167
 168 #if !defined(CONFIG_USER_ONLY)
 169 static void s390_cpu_machine_reset_cb(void *opaque)
 170 {
 171     S390CPU *cpu = opaque;
 172
 173     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 174 }
 175 #endif
 176
 177 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 178 {
 179     info->mach = bfd_mach_s390_64;
 180     info->print_insn = print_insn_s390;
 181 }
 182
 183 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 184 {
 185     CPUState *cs = CPU(dev);
 186     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 187 #if !defined(CONFIG_USER_ONLY)
 188     S390CPU *cpu = S390_CPU(dev);
 189 #endif
 190     Error *err = NULL;
 191
 192     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 193     s390_realize_cpu_model(cs, &err);
 194     if (err) {
 195         goto out;
 196     }
 197
 198 #if !defined(CONFIG_USER_ONLY)
 199     if (cpu->env.core_id >= max_cpus) {
 200         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 201                    ", maximum core-id: %d", cpu->env.core_id,
 202                    max_cpus - 1);
 203         goto out;
 204     }
 205
 206     if (cpu_exists(cpu->env.core_id)) {
 207         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 208                    ", it already exists", cpu->env.core_id);
 209         goto out;
 210     }
 211
 212     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 213     cs->cpu_index = cpu->env.core_id;
 214 #endif
 215
 216     cpu_exec_realizefn(cs, &err);
 217     if (err != NULL) {
 218         goto out;
 219     }
 220
 221 #if !defined(CONFIG_USER_ONLY)
 222     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 223 #endif
 224     s390_cpu_gdb_init(cs);
 225     qemu_init_vcpu(cs);
 226
 227     /*
 228      * KVM requires the initial CPU reset ioctl to be executed on the target
 229      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 230      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 231      * the main thread is already running but the CPU hasn't been realized.
 232      */
 233     if (kvm_enabled()) {
 234         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 235     } else {
 236         cpu_reset(cs);
 237     }
 238
 239     scc->parent_realize(dev, &err);
 240 out:
 241     error_propagate(errp, err);
 242 }
 243
 244 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 245 {
 246     GuestPanicInformation *panic_info;
 247     S390CPU *cpu = S390_CPU(cs);
 248
 249     cpu_synchronize_state(cs);
 250     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 251
 252     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 253 #if !defined(CONFIG_USER_ONLY)
 254     panic_info->u.s390.core = cpu->env.core_id;
 255 #else
 256     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 257 #endif
 258     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 259     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 260     panic_info->u.s390.reason = cpu->env.crash_reason;
 261
 262     return panic_info;
 263 }
 264
 265 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 266                                         const char *name, void *opaque,
 267                                         Error **errp)
 268 {
 269     CPUState *cs = CPU(obj);
 270     GuestPanicInformation *panic_info;
 271
 272     if (!cs->crash_occurred) {
 273         error_setg(errp, "No crash occurred");
 274         return;
 275     }
 276
 277     panic_info = s390_cpu_get_crash_info(cs);
 278
 279     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 280                                      errp);
 281     qapi_free_GuestPanicInformation(panic_info);
 282 }
 283
 284 static void s390_cpu_initfn(Object *obj)
 285 {
 286     CPUState *cs = CPU(obj);
 287     S390CPU *cpu = S390_CPU(obj);
 288     CPUS390XState *env = &cpu->env;
 289
 290     cs->env_ptr = env;
 291     cs->halted = 1;
 292     cs->exception_index = EXCP_HLT;
 293     object_property_add(obj, "crash-information", "GuestPanicInformation",
 294                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 295     s390_cpu_model_register_props(obj);
 296 #if !defined(CONFIG_USER_ONLY)
 297     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 298     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 299     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 300 #endif
 301 }
 302
 303 static void s390_cpu_finalize(Object *obj)
 304 {
 305 #if !defined(CONFIG_USER_ONLY)
 306     S390CPU *cpu = S390_CPU(obj);
 307
 308     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 309     g_free(cpu->irqstate);
 310 #endif
 311 }
 312
 313 #if !defined(CONFIG_USER_ONLY)
 314 static bool disabled_wait(CPUState *cpu)
 315 {
 316     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 317                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 318 }
 319
 320 static unsigned s390_count_running_cpus(void)
 321 {
 322     CPUState *cpu;
 323     int nr_running = 0;
 324
 325     CPU_FOREACH(cpu) {
 326         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 327         if (state == S390_CPU_STATE_OPERATING ||
 328             state == S390_CPU_STATE_LOAD) {
 329             if (!disabled_wait(cpu)) {
 330                 nr_running++;
 331             }
 332         }
 333     }
 334
 335     return nr_running;
 336 }
 337
 338 unsigned int s390_cpu_halt(S390CPU *cpu)
 339 {
 340     CPUState *cs = CPU(cpu);
 341     trace_cpu_halt(cs->cpu_index);
 342
 343     if (!cs->halted) {
 344         cs->halted = 1;
 345         cs->exception_index = EXCP_HLT;
 346     }
 347
 348     return s390_count_running_cpus();
 349 }
 350
 351 void s390_cpu_unhalt(S390CPU *cpu)
 352 {
 353     CPUState *cs = CPU(cpu);
 354     trace_cpu_unhalt(cs->cpu_index);
 355
 356     if (cs->halted) {
 357         cs->halted = 0;
 358         cs->exception_index = -1;
 359     }
 360 }
 361
 362 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 363  {
 364     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 365
 366     switch (cpu_state) {
 367     case S390_CPU_STATE_STOPPED:
 368     case S390_CPU_STATE_CHECK_STOP:
 369         /* halt the cpu for common infrastructure */
 370         s390_cpu_halt(cpu);
 371         break;
 372     case S390_CPU_STATE_OPERATING:
 373     case S390_CPU_STATE_LOAD:
 374         /*
 375          * Starting a CPU with a PSW WAIT bit set:
 376          * KVM: handles this internally and triggers another WAIT exit.
 377          * TCG: will actually try to continue to run. Don't unhalt, will
 378          *      be done when the CPU actually has work (an interrupt).
 379          */
 380         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 381             s390_cpu_unhalt(cpu);
 382         }
 383         break;
 384     default:
 385         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 386                      cpu_state);
 387         exit(1);
 388     }
 389     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 390         kvm_s390_set_cpu_state(cpu, cpu_state);
 391     }
 392     cpu->env.cpu_state = cpu_state;
 393
 394     return s390_count_running_cpus();
 395 }
 396
 397 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 398 {
 399     if (kvm_enabled()) {
 400         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 401     }
 402     return 0;
 403 }
 404
 405 void s390_cmma_reset(void)
 406 {
 407     if (kvm_enabled()) {
 408         kvm_s390_cmma_reset();
 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 void s390_enable_css_support(S390CPU *cpu)
 430 {
 431     if (kvm_enabled()) {
 432         kvm_s390_enable_css_support(cpu);
 433     }
 434 }
 435 #endif
 436
 437 static gchar *s390_gdb_arch_name(CPUState *cs)
 438 {
 439     return g_strdup("s390:64-bit");
 440 }
 441
 442 static Property s390x_cpu_properties[] = {
 443 #if !defined(CONFIG_USER_ONLY)
 444     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 445 #endif
 446     DEFINE_PROP_END_OF_LIST()
 447 };
 448
 449 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 450 {
 451     S390CPUClass *scc = S390_CPU_CLASS(oc);
 452     CPUClass *cc = CPU_CLASS(scc);
 453     DeviceClass *dc = DEVICE_CLASS(oc);
 454
 455     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 456                                     &scc->parent_realize);
 457     dc->props = s390x_cpu_properties;
 458     dc->user_creatable = true;
 459
 460     scc->parent_reset = cc->reset;
 461 #if !defined(CONFIG_USER_ONLY)
 462     scc->load_normal = s390_cpu_load_normal;
 463 #endif
 464     scc->cpu_reset = s390_cpu_reset;
 465     scc->initial_cpu_reset = s390_cpu_initial_reset;
 466     cc->reset = s390_cpu_full_reset;
 467     cc->class_by_name = s390_cpu_class_by_name,
 468     cc->has_work = s390_cpu_has_work;
 469 #ifdef CONFIG_TCG
 470     cc->do_interrupt = s390_cpu_do_interrupt;
 471 #endif
 472     cc->dump_state = s390_cpu_dump_state;
 473     cc->get_crash_info = s390_cpu_get_crash_info;
 474     cc->set_pc = s390_cpu_set_pc;
 475     cc->gdb_read_register = s390_cpu_gdb_read_register;
 476     cc->gdb_write_register = s390_cpu_gdb_write_register;
 477 #ifdef CONFIG_USER_ONLY
 478     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 479 #else
 480     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 481     cc->vmsd = &vmstate_s390_cpu;
 482     cc->write_elf64_note = s390_cpu_write_elf64_note;
 483 #ifdef CONFIG_TCG
 484     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 485     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 486     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 487 #endif
 488 #endif
 489     cc->disas_set_info = s390_cpu_disas_set_info;
 490 #ifdef CONFIG_TCG
 491     cc->tcg_initialize = s390x_translate_init;
 492 #endif
 493
 494     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 495     cc->gdb_core_xml_file = "s390x-core64.xml";
 496     cc->gdb_arch_name = s390_gdb_arch_name;
 497
 498     s390_cpu_model_class_register_props(oc);
 499 }
 500
 501 static const TypeInfo s390_cpu_type_info = {
 502     .name = TYPE_S390_CPU,
 503     .parent = TYPE_CPU,
 504     .instance_size = sizeof(S390CPU),
 505     .instance_init = s390_cpu_initfn,
 506     .instance_finalize = s390_cpu_finalize,
 507     .abstract = true,
 508     .class_size = sizeof(S390CPUClass),
 509     .class_init = s390_cpu_class_init,
 510 };
 511
 512 static void s390_cpu_register_types(void)
 513 {
 514     type_register_static(&s390_cpu_type_info);
 515 }
 516
 517 type_init(s390_cpu_register_types)