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-common.h"
  30 #include "qemu/timer.h"
  31 #include "qemu/error-report.h"
  32 #include "trace.h"
  33 #include "qapi/visitor.h"
  34 #include "qapi/qapi-visit-misc.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 #endif
  43 #include "fpu/softfloat.h"
  44
  45 #define CR0_RESET       0xE0UL
  46 #define CR14_RESET      0xC2000000UL;
  47
  48 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  49 {
  50     S390CPU *cpu = S390_CPU(cs);
  51
  52     cpu->env.psw.addr = value;
  53 }
  54
  55 static bool s390_cpu_has_work(CPUState *cs)
  56 {
  57     S390CPU *cpu = S390_CPU(cs);
  58
  59     /* STOPPED cpus can never wake up */
  60     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  61         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  62         return false;
  63     }
  64
  65     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  66         return false;
  67     }
  68
  69     return s390_cpu_has_int(cpu);
  70 }
  71
  72 #if !defined(CONFIG_USER_ONLY)
  73 /* S390CPUClass::load_normal() */
  74 static void s390_cpu_load_normal(CPUState *s)
  75 {
  76     S390CPU *cpu = S390_CPU(s);
  77     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  78     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  79     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  80 }
  81 #endif
  82
  83 /* S390CPUClass::cpu_reset() */
  84 static void s390_cpu_reset(CPUState *s)
  85 {
  86     S390CPU *cpu = S390_CPU(s);
  87     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  88     CPUS390XState *env = &cpu->env;
  89
  90     env->pfault_token = -1UL;
  91     env->bpbc = false;
  92     scc->parent_reset(s);
  93     cpu->env.sigp_order = 0;
  94     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
  95 }
  96
  97 /* S390CPUClass::initial_reset() */
  98 static void s390_cpu_initial_reset(CPUState *s)
  99 {
 100     S390CPU *cpu = S390_CPU(s);
 101     CPUS390XState *env = &cpu->env;
 102
 103     s390_cpu_reset(s);
 104     /* initial reset does not clear everything! */
 105     memset(&env->start_initial_reset_fields, 0,
 106         offsetof(CPUS390XState, end_reset_fields) -
 107         offsetof(CPUS390XState, start_initial_reset_fields));
 108
 109     /* architectured initial values for CR 0 and 14 */
 110     env->cregs[0] = CR0_RESET;
 111     env->cregs[14] = CR14_RESET;
 112
 113     /* architectured initial value for Breaking-Event-Address register */
 114     env->gbea = 1;
 115
 116     env->pfault_token = -1UL;
 117
 118     /* tininess for underflow is detected before rounding */
 119     set_float_detect_tininess(float_tininess_before_rounding,
 120                               &env->fpu_status);
 121
 122     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 123     if (kvm_enabled()) {
 124         kvm_s390_reset_vcpu(cpu);
 125     }
 126 }
 127
 128 /* CPUClass:reset() */
 129 static void s390_cpu_full_reset(CPUState *s)
 130 {
 131     S390CPU *cpu = S390_CPU(s);
 132     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 133     CPUS390XState *env = &cpu->env;
 134
 135     scc->parent_reset(s);
 136     cpu->env.sigp_order = 0;
 137     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 138
 139     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 140
 141     /* architectured initial values for CR 0 and 14 */
 142     env->cregs[0] = CR0_RESET;
 143     env->cregs[14] = CR14_RESET;
 144
 145 #if defined(CONFIG_USER_ONLY)
 146     /* user mode should always be allowed to use the full FPU */
 147     env->cregs[0] |= CR0_AFP;
 148     if (s390_has_feat(S390_FEAT_VECTOR)) {
 149         env->cregs[0] |= CR0_VECTOR;
 150     }
 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
 289     cpu_set_cpustate_pointers(cpu);
 290     cs->halted = 1;
 291     cs->exception_index = EXCP_HLT;
 292     object_property_add(obj, "crash-information", "GuestPanicInformation",
 293                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 294     s390_cpu_model_register_props(obj);
 295 #if !defined(CONFIG_USER_ONLY)
 296     cpu->env.tod_timer =
 297         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 298     cpu->env.cpu_timer =
 299         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 300     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 301 #endif
 302 }
 303
 304 static void s390_cpu_finalize(Object *obj)
 305 {
 306 #if !defined(CONFIG_USER_ONLY)
 307     S390CPU *cpu = S390_CPU(obj);
 308
 309     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 310     g_free(cpu->irqstate);
 311 #endif
 312 }
 313
 314 #if !defined(CONFIG_USER_ONLY)
 315 static bool disabled_wait(CPUState *cpu)
 316 {
 317     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 318                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 319 }
 320
 321 static unsigned s390_count_running_cpus(void)
 322 {
 323     CPUState *cpu;
 324     int nr_running = 0;
 325
 326     CPU_FOREACH(cpu) {
 327         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 328         if (state == S390_CPU_STATE_OPERATING ||
 329             state == S390_CPU_STATE_LOAD) {
 330             if (!disabled_wait(cpu)) {
 331                 nr_running++;
 332             }
 333         }
 334     }
 335
 336     return nr_running;
 337 }
 338
 339 unsigned int s390_cpu_halt(S390CPU *cpu)
 340 {
 341     CPUState *cs = CPU(cpu);
 342     trace_cpu_halt(cs->cpu_index);
 343
 344     if (!cs->halted) {
 345         cs->halted = 1;
 346         cs->exception_index = EXCP_HLT;
 347     }
 348
 349     return s390_count_running_cpus();
 350 }
 351
 352 void s390_cpu_unhalt(S390CPU *cpu)
 353 {
 354     CPUState *cs = CPU(cpu);
 355     trace_cpu_unhalt(cs->cpu_index);
 356
 357     if (cs->halted) {
 358         cs->halted = 0;
 359         cs->exception_index = -1;
 360     }
 361 }
 362
 363 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 364  {
 365     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 366
 367     switch (cpu_state) {
 368     case S390_CPU_STATE_STOPPED:
 369     case S390_CPU_STATE_CHECK_STOP:
 370         /* halt the cpu for common infrastructure */
 371         s390_cpu_halt(cpu);
 372         break;
 373     case S390_CPU_STATE_OPERATING:
 374     case S390_CPU_STATE_LOAD:
 375         /*
 376          * Starting a CPU with a PSW WAIT bit set:
 377          * KVM: handles this internally and triggers another WAIT exit.
 378          * TCG: will actually try to continue to run. Don't unhalt, will
 379          *      be done when the CPU actually has work (an interrupt).
 380          */
 381         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 382             s390_cpu_unhalt(cpu);
 383         }
 384         break;
 385     default:
 386         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 387                      cpu_state);
 388         exit(1);
 389     }
 390     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 391         kvm_s390_set_cpu_state(cpu, cpu_state);
 392     }
 393     cpu->env.cpu_state = cpu_state;
 394
 395     return s390_count_running_cpus();
 396 }
 397
 398 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 399 {
 400     if (kvm_enabled()) {
 401         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 402     }
 403     return 0;
 404 }
 405
 406 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 407 {
 408     if (kvm_enabled()) {
 409         kvm_s390_set_max_pagesize(pagesize, errp);
 410     }
 411 }
 412
 413 void s390_cmma_reset(void)
 414 {
 415     if (kvm_enabled()) {
 416         kvm_s390_cmma_reset();
 417     }
 418 }
 419
 420 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 421                                 int vq, bool assign)
 422 {
 423     if (kvm_enabled()) {
 424         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 425     } else {
 426         return 0;
 427     }
 428 }
 429
 430 void s390_crypto_reset(void)
 431 {
 432     if (kvm_enabled()) {
 433         kvm_s390_crypto_reset();
 434     }
 435 }
 436
 437 void s390_enable_css_support(S390CPU *cpu)
 438 {
 439     if (kvm_enabled()) {
 440         kvm_s390_enable_css_support(cpu);
 441     }
 442 }
 443 #endif
 444
 445 static gchar *s390_gdb_arch_name(CPUState *cs)
 446 {
 447     return g_strdup("s390:64-bit");
 448 }
 449
 450 static Property s390x_cpu_properties[] = {
 451 #if !defined(CONFIG_USER_ONLY)
 452     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 453 #endif
 454     DEFINE_PROP_END_OF_LIST()
 455 };
 456
 457 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 458 {
 459     S390CPUClass *scc = S390_CPU_CLASS(oc);
 460     CPUClass *cc = CPU_CLASS(scc);
 461     DeviceClass *dc = DEVICE_CLASS(oc);
 462
 463     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 464                                     &scc->parent_realize);
 465     dc->props = s390x_cpu_properties;
 466     dc->user_creatable = true;
 467
 468     scc->parent_reset = cc->reset;
 469 #if !defined(CONFIG_USER_ONLY)
 470     scc->load_normal = s390_cpu_load_normal;
 471 #endif
 472     scc->cpu_reset = s390_cpu_reset;
 473     scc->initial_cpu_reset = s390_cpu_initial_reset;
 474     cc->reset = s390_cpu_full_reset;
 475     cc->class_by_name = s390_cpu_class_by_name,
 476     cc->has_work = s390_cpu_has_work;
 477 #ifdef CONFIG_TCG
 478     cc->do_interrupt = s390_cpu_do_interrupt;
 479 #endif
 480     cc->dump_state = s390_cpu_dump_state;
 481     cc->get_crash_info = s390_cpu_get_crash_info;
 482     cc->set_pc = s390_cpu_set_pc;
 483     cc->gdb_read_register = s390_cpu_gdb_read_register;
 484     cc->gdb_write_register = s390_cpu_gdb_write_register;
 485 #ifndef CONFIG_USER_ONLY
 486     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 487     cc->vmsd = &vmstate_s390_cpu;
 488     cc->write_elf64_note = s390_cpu_write_elf64_note;
 489 #ifdef CONFIG_TCG
 490     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 491     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 492     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 493 #endif
 494 #endif
 495     cc->disas_set_info = s390_cpu_disas_set_info;
 496 #ifdef CONFIG_TCG
 497     cc->tcg_initialize = s390x_translate_init;
 498     cc->tlb_fill = s390_cpu_tlb_fill;
 499 #endif
 500
 501     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 502     cc->gdb_core_xml_file = "s390x-core64.xml";
 503     cc->gdb_arch_name = s390_gdb_arch_name;
 504
 505     s390_cpu_model_class_register_props(oc);
 506 }
 507
 508 static const TypeInfo s390_cpu_type_info = {
 509     .name = TYPE_S390_CPU,
 510     .parent = TYPE_CPU,
 511     .instance_size = sizeof(S390CPU),
 512     .instance_init = s390_cpu_initfn,
 513     .instance_finalize = s390_cpu_finalize,
 514     .abstract = true,
 515     .class_size = sizeof(S390CPUClass),
 516     .class_init = s390_cpu_class_init,
 517 };
 518
 519 static void s390_cpu_register_types(void)
 520 {
 521     type_register_static(&s390_cpu_type_info);
 522 }
 523
 524 type_init(s390_cpu_register_types)