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/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
 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(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     /* architectured initial value for Breaking-Event-Address register */
 147     env->gbea = 1;
 148
 149     env->pfault_token = -1UL;
 150
 151     /* tininess for underflow is detected before rounding */
 152     set_float_detect_tininess(float_tininess_before_rounding,
 153                               &env->fpu_status);
 154
 155     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 156     if (kvm_enabled()) {
 157         kvm_s390_reset_vcpu(cpu);
 158     }
 159 }
 160
 161 #if !defined(CONFIG_USER_ONLY)
 162 static void s390_cpu_machine_reset_cb(void *opaque)
 163 {
 164     S390CPU *cpu = opaque;
 165
 166     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 167 }
 168 #endif
 169
 170 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 171 {
 172     info->mach = bfd_mach_s390_64;
 173     info->print_insn = print_insn_s390;
 174 }
 175
 176 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 177 {
 178     CPUState *cs = CPU(dev);
 179     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 180 #if !defined(CONFIG_USER_ONLY)
 181     S390CPU *cpu = S390_CPU(dev);
 182 #endif
 183     Error *err = NULL;
 184
 185     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 186     s390_realize_cpu_model(cs, &err);
 187     if (err) {
 188         goto out;
 189     }
 190
 191 #if !defined(CONFIG_USER_ONLY)
 192     if (cpu->env.core_id >= max_cpus) {
 193         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 194                    ", maximum core-id: %d", cpu->env.core_id,
 195                    max_cpus - 1);
 196         goto out;
 197     }
 198
 199     if (cpu_exists(cpu->env.core_id)) {
 200         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 201                    ", it already exists", cpu->env.core_id);
 202         goto out;
 203     }
 204
 205     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 206     cs->cpu_index = cpu->env.core_id;
 207 #endif
 208
 209     cpu_exec_realizefn(cs, &err);
 210     if (err != NULL) {
 211         goto out;
 212     }
 213
 214 #if !defined(CONFIG_USER_ONLY)
 215     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 216 #endif
 217     s390_cpu_gdb_init(cs);
 218     qemu_init_vcpu(cs);
 219 #if !defined(CONFIG_USER_ONLY)
 220     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 221 #else
 222     cpu_reset(cs);
 223 #endif
 224
 225     scc->parent_realize(dev, &err);
 226 out:
 227     error_propagate(errp, err);
 228 }
 229
 230 static void s390_cpu_initfn(Object *obj)
 231 {
 232     CPUState *cs = CPU(obj);
 233     S390CPU *cpu = S390_CPU(obj);
 234     CPUS390XState *env = &cpu->env;
 235 #if !defined(CONFIG_USER_ONLY)
 236     struct tm tm;
 237 #endif
 238
 239     cs->env_ptr = env;
 240     cs->halted = 1;
 241     cs->exception_index = EXCP_HLT;
 242     s390_cpu_model_register_props(obj);
 243 #if !defined(CONFIG_USER_ONLY)
 244     qemu_get_timedate(&tm, 0);
 245     env->tod_offset = TOD_UNIX_EPOCH +
 246                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 247     env->tod_basetime = 0;
 248     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 249     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 250     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 251 #endif
 252 }
 253
 254 static void s390_cpu_finalize(Object *obj)
 255 {
 256 #if !defined(CONFIG_USER_ONLY)
 257     S390CPU *cpu = S390_CPU(obj);
 258
 259     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 260     g_free(cpu->irqstate);
 261 #endif
 262 }
 263
 264 #if !defined(CONFIG_USER_ONLY)
 265 static bool disabled_wait(CPUState *cpu)
 266 {
 267     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 268                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 269 }
 270
 271 static unsigned s390_count_running_cpus(void)
 272 {
 273     CPUState *cpu;
 274     int nr_running = 0;
 275
 276     CPU_FOREACH(cpu) {
 277         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 278         if (state == CPU_STATE_OPERATING ||
 279             state == CPU_STATE_LOAD) {
 280             if (!disabled_wait(cpu)) {
 281                 nr_running++;
 282             }
 283         }
 284     }
 285
 286     return nr_running;
 287 }
 288
 289 unsigned int s390_cpu_halt(S390CPU *cpu)
 290 {
 291     CPUState *cs = CPU(cpu);
 292     trace_cpu_halt(cs->cpu_index);
 293
 294     if (!cs->halted) {
 295         cs->halted = 1;
 296         cs->exception_index = EXCP_HLT;
 297     }
 298
 299     return s390_count_running_cpus();
 300 }
 301
 302 void s390_cpu_unhalt(S390CPU *cpu)
 303 {
 304     CPUState *cs = CPU(cpu);
 305     trace_cpu_unhalt(cs->cpu_index);
 306
 307     if (cs->halted) {
 308         cs->halted = 0;
 309         cs->exception_index = -1;
 310     }
 311 }
 312
 313 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 314  {
 315     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 316
 317     switch (cpu_state) {
 318     case CPU_STATE_STOPPED:
 319     case CPU_STATE_CHECK_STOP:
 320         /* halt the cpu for common infrastructure */
 321         s390_cpu_halt(cpu);
 322         break;
 323     case CPU_STATE_OPERATING:
 324     case CPU_STATE_LOAD:
 325         /*
 326          * Starting a CPU with a PSW WAIT bit set:
 327          * KVM: handles this internally and triggers another WAIT exit.
 328          * TCG: will actually try to continue to run. Don't unhalt, will
 329          *      be done when the CPU actually has work (an interrupt).
 330          */
 331         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 332             s390_cpu_unhalt(cpu);
 333         }
 334         break;
 335     default:
 336         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 337                      cpu_state);
 338         exit(1);
 339     }
 340     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 341         kvm_s390_set_cpu_state(cpu, cpu_state);
 342     }
 343     cpu->env.cpu_state = cpu_state;
 344
 345     return s390_count_running_cpus();
 346 }
 347
 348 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 349 {
 350     int r = 0;
 351
 352     if (kvm_enabled()) {
 353         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 354         if (r == -ENXIO) {
 355             return kvm_s390_get_clock(tod_high, tod_low);
 356         }
 357     } else {
 358         /* Fixme TCG */
 359         *tod_high = 0;
 360         *tod_low = 0;
 361     }
 362
 363     return r;
 364 }
 365
 366 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 367 {
 368     int r = 0;
 369
 370     if (kvm_enabled()) {
 371         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 372         if (r == -ENXIO) {
 373             return kvm_s390_set_clock(tod_high, tod_low);
 374         }
 375     }
 376     /* Fixme TCG */
 377     return r;
 378 }
 379
 380 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 381 {
 382     if (kvm_enabled()) {
 383         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 384     }
 385     return 0;
 386 }
 387
 388 void s390_cmma_reset(void)
 389 {
 390     if (kvm_enabled()) {
 391         kvm_s390_cmma_reset();
 392     }
 393 }
 394
 395 int s390_get_memslot_count(void)
 396 {
 397     if (kvm_enabled()) {
 398         return kvm_s390_get_memslot_count();
 399     } else {
 400         return MAX_AVAIL_SLOTS;
 401     }
 402 }
 403
 404 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 405                                 int vq, bool assign)
 406 {
 407     if (kvm_enabled()) {
 408         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 409     } else {
 410         return 0;
 411     }
 412 }
 413
 414 void s390_crypto_reset(void)
 415 {
 416     if (kvm_enabled()) {
 417         kvm_s390_crypto_reset();
 418     }
 419 }
 420
 421 bool s390_get_squash_mcss(void)
 422 {
 423     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 424                                  NULL)) {
 425         return true;
 426     }
 427
 428     return false;
 429 }
 430
 431 void s390_enable_css_support(S390CPU *cpu)
 432 {
 433     if (kvm_enabled()) {
 434         kvm_s390_enable_css_support(cpu);
 435     }
 436 }
 437 #endif
 438
 439 static gchar *s390_gdb_arch_name(CPUState *cs)
 440 {
 441     return g_strdup("s390:64-bit");
 442 }
 443
 444 static Property s390x_cpu_properties[] = {
 445 #if !defined(CONFIG_USER_ONLY)
 446     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 447 #endif
 448     DEFINE_PROP_END_OF_LIST()
 449 };
 450
 451 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 452 {
 453     S390CPUClass *scc = S390_CPU_CLASS(oc);
 454     CPUClass *cc = CPU_CLASS(scc);
 455     DeviceClass *dc = DEVICE_CLASS(oc);
 456
 457     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 458                                     &scc->parent_realize);
 459     dc->props = s390x_cpu_properties;
 460     dc->user_creatable = true;
 461
 462     scc->parent_reset = cc->reset;
 463 #if !defined(CONFIG_USER_ONLY)
 464     scc->load_normal = s390_cpu_load_normal;
 465 #endif
 466     scc->cpu_reset = s390_cpu_reset;
 467     scc->initial_cpu_reset = s390_cpu_initial_reset;
 468     cc->reset = s390_cpu_full_reset;
 469     cc->class_by_name = s390_cpu_class_by_name,
 470     cc->has_work = s390_cpu_has_work;
 471 #ifdef CONFIG_TCG
 472     cc->do_interrupt = s390_cpu_do_interrupt;
 473 #endif
 474     cc->dump_state = s390_cpu_dump_state;
 475     cc->set_pc = s390_cpu_set_pc;
 476     cc->gdb_read_register = s390_cpu_gdb_read_register;
 477     cc->gdb_write_register = s390_cpu_gdb_write_register;
 478 #ifdef CONFIG_USER_ONLY
 479     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 480 #else
 481     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 482     cc->vmsd = &vmstate_s390_cpu;
 483     cc->write_elf64_note = s390_cpu_write_elf64_note;
 484 #ifdef CONFIG_TCG
 485     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 486     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 487     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 488 #endif
 489 #endif
 490     cc->disas_set_info = s390_cpu_disas_set_info;
 491 #ifdef CONFIG_TCG
 492     cc->tcg_initialize = s390x_translate_init;
 493 #endif
 494
 495     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 496     cc->gdb_core_xml_file = "s390x-core64.xml";
 497     cc->gdb_arch_name = s390_gdb_arch_name;
 498
 499     s390_cpu_model_class_register_props(oc);
 500 }
 501
 502 static const TypeInfo s390_cpu_type_info = {
 503     .name = TYPE_S390_CPU,
 504     .parent = TYPE_CPU,
 505     .instance_size = sizeof(S390CPU),
 506     .instance_init = s390_cpu_initfn,
 507     .instance_finalize = s390_cpu_finalize,
 508     .abstract = true,
 509     .class_size = sizeof(S390CPUClass),
 510     .class_init = s390_cpu_class_init,
 511 };
 512
 513 static void s390_cpu_register_types(void)
 514 {
 515     type_register_static(&s390_cpu_type_info);
 516 }
 517
 518 type_init(s390_cpu_register_types)