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 "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 #if !defined(CONFIG_USER_ONLY)
 251 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 252 {
 253     GuestPanicInformation *panic_info;
 254     S390CPU *cpu = S390_CPU(cs);
 255
 256     cpu_synchronize_state(cs);
 257     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 258
 259     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 260     panic_info->u.s390.core = cpu->env.core_id;
 261     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 262     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 263     panic_info->u.s390.reason = cpu->env.crash_reason;
 264
 265     return panic_info;
 266 }
 267
 268 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 269                                         const char *name, void *opaque,
 270                                         Error **errp)
 271 {
 272     CPUState *cs = CPU(obj);
 273     GuestPanicInformation *panic_info;
 274
 275     if (!cs->crash_occurred) {
 276         error_setg(errp, "No crash occurred");
 277         return;
 278     }
 279
 280     panic_info = s390_cpu_get_crash_info(cs);
 281
 282     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 283                                      errp);
 284     qapi_free_GuestPanicInformation(panic_info);
 285 }
 286 #endif
 287
 288 static void s390_cpu_initfn(Object *obj)
 289 {
 290     CPUState *cs = CPU(obj);
 291     S390CPU *cpu = S390_CPU(obj);
 292
 293     cpu_set_cpustate_pointers(cpu);
 294     cs->halted = 1;
 295     cs->exception_index = EXCP_HLT;
 296 #if !defined(CONFIG_USER_ONLY)
 297     object_property_add(obj, "crash-information", "GuestPanicInformation",
 298                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL);
 299     cpu->env.tod_timer =
 300         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 301     cpu->env.cpu_timer =
 302         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 303     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 304 #endif
 305     s390_cpu_model_register_props(obj);
 306 }
 307
 308 static void s390_cpu_finalize(Object *obj)
 309 {
 310 #if !defined(CONFIG_USER_ONLY)
 311     S390CPU *cpu = S390_CPU(obj);
 312
 313     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 314     g_free(cpu->irqstate);
 315 #endif
 316 }
 317
 318 #if !defined(CONFIG_USER_ONLY)
 319 static bool disabled_wait(CPUState *cpu)
 320 {
 321     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 322                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 323 }
 324
 325 static unsigned s390_count_running_cpus(void)
 326 {
 327     CPUState *cpu;
 328     int nr_running = 0;
 329
 330     CPU_FOREACH(cpu) {
 331         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 332         if (state == S390_CPU_STATE_OPERATING ||
 333             state == S390_CPU_STATE_LOAD) {
 334             if (!disabled_wait(cpu)) {
 335                 nr_running++;
 336             }
 337         }
 338     }
 339
 340     return nr_running;
 341 }
 342
 343 unsigned int s390_cpu_halt(S390CPU *cpu)
 344 {
 345     CPUState *cs = CPU(cpu);
 346     trace_cpu_halt(cs->cpu_index);
 347
 348     if (!cs->halted) {
 349         cs->halted = 1;
 350         cs->exception_index = EXCP_HLT;
 351     }
 352
 353     return s390_count_running_cpus();
 354 }
 355
 356 void s390_cpu_unhalt(S390CPU *cpu)
 357 {
 358     CPUState *cs = CPU(cpu);
 359     trace_cpu_unhalt(cs->cpu_index);
 360
 361     if (cs->halted) {
 362         cs->halted = 0;
 363         cs->exception_index = -1;
 364     }
 365 }
 366
 367 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 368  {
 369     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 370
 371     switch (cpu_state) {
 372     case S390_CPU_STATE_STOPPED:
 373     case S390_CPU_STATE_CHECK_STOP:
 374         /* halt the cpu for common infrastructure */
 375         s390_cpu_halt(cpu);
 376         break;
 377     case S390_CPU_STATE_OPERATING:
 378     case S390_CPU_STATE_LOAD:
 379         /*
 380          * Starting a CPU with a PSW WAIT bit set:
 381          * KVM: handles this internally and triggers another WAIT exit.
 382          * TCG: will actually try to continue to run. Don't unhalt, will
 383          *      be done when the CPU actually has work (an interrupt).
 384          */
 385         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 386             s390_cpu_unhalt(cpu);
 387         }
 388         break;
 389     default:
 390         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 391                      cpu_state);
 392         exit(1);
 393     }
 394     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 395         kvm_s390_set_cpu_state(cpu, cpu_state);
 396     }
 397     cpu->env.cpu_state = cpu_state;
 398
 399     return s390_count_running_cpus();
 400 }
 401
 402 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 403 {
 404     if (kvm_enabled()) {
 405         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 406     }
 407     return 0;
 408 }
 409
 410 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 411 {
 412     if (kvm_enabled()) {
 413         kvm_s390_set_max_pagesize(pagesize, errp);
 414     }
 415 }
 416
 417 void s390_cmma_reset(void)
 418 {
 419     if (kvm_enabled()) {
 420         kvm_s390_cmma_reset();
 421     }
 422 }
 423
 424 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 425                                 int vq, bool assign)
 426 {
 427     if (kvm_enabled()) {
 428         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 429     } else {
 430         return 0;
 431     }
 432 }
 433
 434 void s390_crypto_reset(void)
 435 {
 436     if (kvm_enabled()) {
 437         kvm_s390_crypto_reset();
 438     }
 439 }
 440
 441 void s390_enable_css_support(S390CPU *cpu)
 442 {
 443     if (kvm_enabled()) {
 444         kvm_s390_enable_css_support(cpu);
 445     }
 446 }
 447 #endif
 448
 449 static gchar *s390_gdb_arch_name(CPUState *cs)
 450 {
 451     return g_strdup("s390:64-bit");
 452 }
 453
 454 static Property s390x_cpu_properties[] = {
 455 #if !defined(CONFIG_USER_ONLY)
 456     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 457 #endif
 458     DEFINE_PROP_END_OF_LIST()
 459 };
 460
 461 static void s390_cpu_reset_full(DeviceState *dev)
 462 {
 463     CPUState *s = CPU(dev);
 464     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 465 }
 466
 467 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 468 {
 469     S390CPUClass *scc = S390_CPU_CLASS(oc);
 470     CPUClass *cc = CPU_CLASS(scc);
 471     DeviceClass *dc = DEVICE_CLASS(oc);
 472
 473     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 474                                     &scc->parent_realize);
 475     device_class_set_props(dc, s390x_cpu_properties);
 476     dc->user_creatable = true;
 477
 478     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 479 #if !defined(CONFIG_USER_ONLY)
 480     scc->load_normal = s390_cpu_load_normal;
 481 #endif
 482     scc->reset = s390_cpu_reset;
 483     cc->class_by_name = s390_cpu_class_by_name,
 484     cc->has_work = s390_cpu_has_work;
 485 #ifdef CONFIG_TCG
 486     cc->do_interrupt = s390_cpu_do_interrupt;
 487 #endif
 488     cc->dump_state = s390_cpu_dump_state;
 489     cc->set_pc = s390_cpu_set_pc;
 490     cc->gdb_read_register = s390_cpu_gdb_read_register;
 491     cc->gdb_write_register = s390_cpu_gdb_write_register;
 492 #ifndef CONFIG_USER_ONLY
 493     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 494     cc->vmsd = &vmstate_s390_cpu;
 495     cc->get_crash_info = s390_cpu_get_crash_info;
 496     cc->write_elf64_note = s390_cpu_write_elf64_note;
 497 #ifdef CONFIG_TCG
 498     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 499     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 500     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 501 #endif
 502 #endif
 503     cc->disas_set_info = s390_cpu_disas_set_info;
 504 #ifdef CONFIG_TCG
 505     cc->tcg_initialize = s390x_translate_init;
 506     cc->tlb_fill = s390_cpu_tlb_fill;
 507 #endif
 508
 509     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 510     cc->gdb_core_xml_file = "s390x-core64.xml";
 511     cc->gdb_arch_name = s390_gdb_arch_name;
 512
 513     s390_cpu_model_class_register_props(oc);
 514 }
 515
 516 static const TypeInfo s390_cpu_type_info = {
 517     .name = TYPE_S390_CPU,
 518     .parent = TYPE_CPU,
 519     .instance_size = sizeof(S390CPU),
 520     .instance_init = s390_cpu_initfn,
 521     .instance_finalize = s390_cpu_finalize,
 522     .abstract = true,
 523     .class_size = sizeof(S390CPUClass),
 524     .class_init = s390_cpu_class_init,
 525 };
 526
 527 static void s390_cpu_register_types(void)
 528 {
 529     type_register_static(&s390_cpu_type_info);
 530 }
 531
 532 type_init(s390_cpu_register_types)