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 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 "qemu/timer.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/module.h"
  32 #include "trace.h"
  33 #include "qapi/visitor.h"
  34 #include "qapi/qapi-types-machine.h"
  35 #include "qapi/qapi-visit-run-state.h"
  36 #include "sysemu/hw_accel.h"
  37 #include "hw/qdev-properties.h"
  38 #ifndef CONFIG_USER_ONLY
  39 #include "hw/hw.h"
  40 #include "sysemu/arch_init.h"
  41 #include "sysemu/sysemu.h"
  42 #include "sysemu/tcg.h"
  43 #endif
  44 #include "fpu/softfloat.h"
  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) != S390_CPU_STATE_LOAD &&
  62         s390_cpu_get_state(cpu) != S390_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(S390_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(S390_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
 104     s390_cpu_reset(s);
 105     /* initial reset does not clear everything! */
 106     memset(&env->start_initial_reset_fields, 0,
 107         offsetof(CPUS390XState, end_reset_fields) -
 108         offsetof(CPUS390XState, start_initial_reset_fields));
 109
 110     /* architectured initial values for CR 0 and 14 */
 111     env->cregs[0] = CR0_RESET;
 112     env->cregs[14] = CR14_RESET;
 113
 114     /* architectured initial value for Breaking-Event-Address register */
 115     env->gbea = 1;
 116
 117     env->pfault_token = -1UL;
 118
 119     /* tininess for underflow is detected before rounding */
 120     set_float_detect_tininess(float_tininess_before_rounding,
 121                               &env->fpu_status);
 122
 123     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 124     if (kvm_enabled()) {
 125         kvm_s390_reset_vcpu(cpu);
 126     }
 127 }
 128
 129 /* CPUClass:reset() */
 130 static void s390_cpu_full_reset(CPUState *s)
 131 {
 132     S390CPU *cpu = S390_CPU(s);
 133     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 134     CPUS390XState *env = &cpu->env;
 135
 136     scc->parent_reset(s);
 137     cpu->env.sigp_order = 0;
 138     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 139
 140     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 141
 142     /* architectured initial values for CR 0 and 14 */
 143     env->cregs[0] = CR0_RESET;
 144     env->cregs[14] = CR14_RESET;
 145
 146 #if defined(CONFIG_USER_ONLY)
 147     /* user mode should always be allowed to use the full FPU */
 148     env->cregs[0] |= CR0_AFP;
 149     if (s390_has_feat(S390_FEAT_VECTOR)) {
 150         env->cregs[0] |= CR0_VECTOR;
 151     }
 152 #endif
 153
 154     /* architectured initial value for Breaking-Event-Address register */
 155     env->gbea = 1;
 156
 157     env->pfault_token = -1UL;
 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
 228     /*
 229      * KVM requires the initial CPU reset ioctl to be executed on the target
 230      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 231      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 232      * the main thread is already running but the CPU hasn't been realized.
 233      */
 234     if (kvm_enabled()) {
 235         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 236     } else {
 237         cpu_reset(cs);
 238     }
 239
 240     scc->parent_realize(dev, &err);
 241 out:
 242     error_propagate(errp, err);
 243 }
 244
 245 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 246 {
 247     GuestPanicInformation *panic_info;
 248     S390CPU *cpu = S390_CPU(cs);
 249
 250     cpu_synchronize_state(cs);
 251     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 252
 253     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 254 #if !defined(CONFIG_USER_ONLY)
 255     panic_info->u.s390.core = cpu->env.core_id;
 256 #else
 257     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 258 #endif
 259     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 260     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 261     panic_info->u.s390.reason = cpu->env.crash_reason;
 262
 263     return panic_info;
 264 }
 265
 266 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 267                                         const char *name, void *opaque,
 268                                         Error **errp)
 269 {
 270     CPUState *cs = CPU(obj);
 271     GuestPanicInformation *panic_info;
 272
 273     if (!cs->crash_occurred) {
 274         error_setg(errp, "No crash occurred");
 275         return;
 276     }
 277
 278     panic_info = s390_cpu_get_crash_info(cs);
 279
 280     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 281                                      errp);
 282     qapi_free_GuestPanicInformation(panic_info);
 283 }
 284
 285 static void s390_cpu_initfn(Object *obj)
 286 {
 287     CPUState *cs = CPU(obj);
 288     S390CPU *cpu = S390_CPU(obj);
 289
 290     cpu_set_cpustate_pointers(cpu);
 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     cpu->env.tod_timer =
 298         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 299     cpu->env.cpu_timer =
 300         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 301     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 302 #endif
 303 }
 304
 305 static void s390_cpu_finalize(Object *obj)
 306 {
 307 #if !defined(CONFIG_USER_ONLY)
 308     S390CPU *cpu = S390_CPU(obj);
 309
 310     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 311     g_free(cpu->irqstate);
 312 #endif
 313 }
 314
 315 #if !defined(CONFIG_USER_ONLY)
 316 static bool disabled_wait(CPUState *cpu)
 317 {
 318     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 319                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 320 }
 321
 322 static unsigned s390_count_running_cpus(void)
 323 {
 324     CPUState *cpu;
 325     int nr_running = 0;
 326
 327     CPU_FOREACH(cpu) {
 328         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 329         if (state == S390_CPU_STATE_OPERATING ||
 330             state == S390_CPU_STATE_LOAD) {
 331             if (!disabled_wait(cpu)) {
 332                 nr_running++;
 333             }
 334         }
 335     }
 336
 337     return nr_running;
 338 }
 339
 340 unsigned int s390_cpu_halt(S390CPU *cpu)
 341 {
 342     CPUState *cs = CPU(cpu);
 343     trace_cpu_halt(cs->cpu_index);
 344
 345     if (!cs->halted) {
 346         cs->halted = 1;
 347         cs->exception_index = EXCP_HLT;
 348     }
 349
 350     return s390_count_running_cpus();
 351 }
 352
 353 void s390_cpu_unhalt(S390CPU *cpu)
 354 {
 355     CPUState *cs = CPU(cpu);
 356     trace_cpu_unhalt(cs->cpu_index);
 357
 358     if (cs->halted) {
 359         cs->halted = 0;
 360         cs->exception_index = -1;
 361     }
 362 }
 363
 364 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 365  {
 366     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 367
 368     switch (cpu_state) {
 369     case S390_CPU_STATE_STOPPED:
 370     case S390_CPU_STATE_CHECK_STOP:
 371         /* halt the cpu for common infrastructure */
 372         s390_cpu_halt(cpu);
 373         break;
 374     case S390_CPU_STATE_OPERATING:
 375     case S390_CPU_STATE_LOAD:
 376         /*
 377          * Starting a CPU with a PSW WAIT bit set:
 378          * KVM: handles this internally and triggers another WAIT exit.
 379          * TCG: will actually try to continue to run. Don't unhalt, will
 380          *      be done when the CPU actually has work (an interrupt).
 381          */
 382         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 383             s390_cpu_unhalt(cpu);
 384         }
 385         break;
 386     default:
 387         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 388                      cpu_state);
 389         exit(1);
 390     }
 391     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 392         kvm_s390_set_cpu_state(cpu, cpu_state);
 393     }
 394     cpu->env.cpu_state = cpu_state;
 395
 396     return s390_count_running_cpus();
 397 }
 398
 399 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 400 {
 401     if (kvm_enabled()) {
 402         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 403     }
 404     return 0;
 405 }
 406
 407 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 408 {
 409     if (kvm_enabled()) {
 410         kvm_s390_set_max_pagesize(pagesize, errp);
 411     }
 412 }
 413
 414 void s390_cmma_reset(void)
 415 {
 416     if (kvm_enabled()) {
 417         kvm_s390_cmma_reset();
 418     }
 419 }
 420
 421 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 422                                 int vq, bool assign)
 423 {
 424     if (kvm_enabled()) {
 425         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 426     } else {
 427         return 0;
 428     }
 429 }
 430
 431 void s390_crypto_reset(void)
 432 {
 433     if (kvm_enabled()) {
 434         kvm_s390_crypto_reset();
 435     }
 436 }
 437
 438 void s390_enable_css_support(S390CPU *cpu)
 439 {
 440     if (kvm_enabled()) {
 441         kvm_s390_enable_css_support(cpu);
 442     }
 443 }
 444 #endif
 445
 446 static gchar *s390_gdb_arch_name(CPUState *cs)
 447 {
 448     return g_strdup("s390:64-bit");
 449 }
 450
 451 static Property s390x_cpu_properties[] = {
 452 #if !defined(CONFIG_USER_ONLY)
 453     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 454 #endif
 455     DEFINE_PROP_END_OF_LIST()
 456 };
 457
 458 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 459 {
 460     S390CPUClass *scc = S390_CPU_CLASS(oc);
 461     CPUClass *cc = CPU_CLASS(scc);
 462     DeviceClass *dc = DEVICE_CLASS(oc);
 463
 464     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 465                                     &scc->parent_realize);
 466     dc->props = s390x_cpu_properties;
 467     dc->user_creatable = true;
 468
 469     scc->parent_reset = cc->reset;
 470 #if !defined(CONFIG_USER_ONLY)
 471     scc->load_normal = s390_cpu_load_normal;
 472 #endif
 473     scc->cpu_reset = s390_cpu_reset;
 474     scc->initial_cpu_reset = s390_cpu_initial_reset;
 475     cc->reset = s390_cpu_full_reset;
 476     cc->class_by_name = s390_cpu_class_by_name,
 477     cc->has_work = s390_cpu_has_work;
 478 #ifdef CONFIG_TCG
 479     cc->do_interrupt = s390_cpu_do_interrupt;
 480 #endif
 481     cc->dump_state = s390_cpu_dump_state;
 482     cc->get_crash_info = s390_cpu_get_crash_info;
 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 #ifndef CONFIG_USER_ONLY
 487     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 488     cc->vmsd = &vmstate_s390_cpu;
 489     cc->write_elf64_note = s390_cpu_write_elf64_note;
 490 #ifdef CONFIG_TCG
 491     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 492     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 493     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 494 #endif
 495 #endif
 496     cc->disas_set_info = s390_cpu_disas_set_info;
 497 #ifdef CONFIG_TCG
 498     cc->tcg_initialize = s390x_translate_init;
 499     cc->tlb_fill = s390_cpu_tlb_fill;
 500 #endif
 501
 502     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 503     cc->gdb_core_xml_file = "s390x-core64.xml";
 504     cc->gdb_arch_name = s390_gdb_arch_name;
 505
 506     s390_cpu_model_class_register_props(oc);
 507 }
 508
 509 static const TypeInfo s390_cpu_type_info = {
 510     .name = TYPE_S390_CPU,
 511     .parent = TYPE_CPU,
 512     .instance_size = sizeof(S390CPU),
 513     .instance_init = s390_cpu_initfn,
 514     .instance_finalize = s390_cpu_finalize,
 515     .abstract = true,
 516     .class_size = sizeof(S390CPUClass),
 517     .class_init = s390_cpu_class_init,
 518 };
 519
 520 static void s390_cpu_register_types(void)
 521 {
 522     type_register_static(&s390_cpu_type_info);
 523 }
 524
 525 type_init(s390_cpu_register_types)