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/boards.h"
  41 #include "sysemu/arch_init.h"
  42 #include "sysemu/sysemu.h"
  43 #include "sysemu/tcg.h"
  44 #endif
  45 #include "fpu/softfloat-helpers.h"
  46
  47 #define CR0_RESET       0xE0UL
  48 #define CR14_RESET      0xC2000000UL;
  49
  50 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  51 {
  52     S390CPU *cpu = S390_CPU(cs);
  53
  54     cpu->env.psw.addr = value;
  55 }
  56
  57 static bool s390_cpu_has_work(CPUState *cs)
  58 {
  59     S390CPU *cpu = S390_CPU(cs);
  60
  61     /* STOPPED cpus can never wake up */
  62     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  63         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  64         return false;
  65     }
  66
  67     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  68         return false;
  69     }
  70
  71     return s390_cpu_has_int(cpu);
  72 }
  73
  74 #if !defined(CONFIG_USER_ONLY)
  75 /* S390CPUClass::load_normal() */
  76 static void s390_cpu_load_normal(CPUState *s)
  77 {
  78     S390CPU *cpu = S390_CPU(s);
  79     uint64_t spsw = ldq_phys(s->as, 0);
  80
  81     cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
  82     /*
  83      * Invert short psw indication, so SIE will report a specification
  84      * exception if it was not set.
  85      */
  86     cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
  87     cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
  88
  89     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  90 }
  91 #endif
  92
  93 /* S390CPUClass::reset() */
  94 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
  95 {
  96     S390CPU *cpu = S390_CPU(s);
  97     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  98     CPUS390XState *env = &cpu->env;
  99     DeviceState *dev = DEVICE(s);
 100
 101     scc->parent_reset(dev);
 102     cpu->env.sigp_order = 0;
 103     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 104
 105     switch (type) {
 106     case S390_CPU_RESET_CLEAR:
 107         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 108         /* fall through */
 109     case S390_CPU_RESET_INITIAL:
 110         /* initial reset does not clear everything! */
 111         memset(&env->start_initial_reset_fields, 0,
 112                offsetof(CPUS390XState, start_normal_reset_fields) -
 113                offsetof(CPUS390XState, start_initial_reset_fields));
 114
 115         /* architectured initial value for Breaking-Event-Address register */
 116         env->gbea = 1;
 117
 118         /* architectured initial values for CR 0 and 14 */
 119         env->cregs[0] = CR0_RESET;
 120         env->cregs[14] = CR14_RESET;
 121
 122 #if defined(CONFIG_USER_ONLY)
 123         /* user mode should always be allowed to use the full FPU */
 124         env->cregs[0] |= CR0_AFP;
 125         if (s390_has_feat(S390_FEAT_VECTOR)) {
 126             env->cregs[0] |= CR0_VECTOR;
 127         }
 128 #endif
 129
 130         /* tininess for underflow is detected before rounding */
 131         set_float_detect_tininess(float_tininess_before_rounding,
 132                                   &env->fpu_status);
 133        /* fall through */
 134     case S390_CPU_RESET_NORMAL:
 135         env->psw.mask &= ~PSW_MASK_RI;
 136         memset(&env->start_normal_reset_fields, 0,
 137                offsetof(CPUS390XState, end_reset_fields) -
 138                offsetof(CPUS390XState, start_normal_reset_fields));
 139
 140         env->pfault_token = -1UL;
 141         env->bpbc = false;
 142         break;
 143     default:
 144         g_assert_not_reached();
 145     }
 146
 147     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 148     if (kvm_enabled()) {
 149         switch (type) {
 150         case S390_CPU_RESET_CLEAR:
 151             kvm_s390_reset_vcpu_clear(cpu);
 152             break;
 153         case S390_CPU_RESET_INITIAL:
 154             kvm_s390_reset_vcpu_initial(cpu);
 155             break;
 156         case S390_CPU_RESET_NORMAL:
 157             kvm_s390_reset_vcpu_normal(cpu);
 158             break;
 159         }
 160     }
 161 }
 162
 163 #if !defined(CONFIG_USER_ONLY)
 164 static void s390_cpu_machine_reset_cb(void *opaque)
 165 {
 166     S390CPU *cpu = opaque;
 167
 168     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 169 }
 170 #endif
 171
 172 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 173 {
 174     info->mach = bfd_mach_s390_64;
 175     info->print_insn = print_insn_s390;
 176 }
 177
 178 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 179 {
 180     CPUState *cs = CPU(dev);
 181     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 182 #if !defined(CONFIG_USER_ONLY)
 183     S390CPU *cpu = S390_CPU(dev);
 184 #endif
 185     Error *err = NULL;
 186
 187     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 188     s390_realize_cpu_model(cs, &err);
 189     if (err) {
 190         goto out;
 191     }
 192
 193 #if !defined(CONFIG_USER_ONLY)
 194     MachineState *ms = MACHINE(qdev_get_machine());
 195     unsigned int max_cpus = ms->smp.max_cpus;
 196     if (cpu->env.core_id >= max_cpus) {
 197         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 198                    ", maximum core-id: %d", cpu->env.core_id,
 199                    max_cpus - 1);
 200         goto out;
 201     }
 202
 203     if (cpu_exists(cpu->env.core_id)) {
 204         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 205                    ", it already exists", cpu->env.core_id);
 206         goto out;
 207     }
 208
 209     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 210     cs->cpu_index = cpu->env.core_id;
 211 #endif
 212
 213     cpu_exec_realizefn(cs, &err);
 214     if (err != NULL) {
 215         goto out;
 216     }
 217
 218 #if !defined(CONFIG_USER_ONLY)
 219     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 220 #endif
 221     s390_cpu_gdb_init(cs);
 222     qemu_init_vcpu(cs);
 223
 224     /*
 225      * KVM requires the initial CPU reset ioctl to be executed on the target
 226      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 227      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 228      * the main thread is already running but the CPU hasn't been realized.
 229      */
 230     if (kvm_enabled()) {
 231         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 232     } else {
 233         cpu_reset(cs);
 234     }
 235
 236     scc->parent_realize(dev, &err);
 237 out:
 238     error_propagate(errp, err);
 239 }
 240
 241 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 242 {
 243     GuestPanicInformation *panic_info;
 244     S390CPU *cpu = S390_CPU(cs);
 245
 246     cpu_synchronize_state(cs);
 247     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 248
 249     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 250 #if !defined(CONFIG_USER_ONLY)
 251     panic_info->u.s390.core = cpu->env.core_id;
 252 #else
 253     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 254 #endif
 255     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 256     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 257     panic_info->u.s390.reason = cpu->env.crash_reason;
 258
 259     return panic_info;
 260 }
 261
 262 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 263                                         const char *name, void *opaque,
 264                                         Error **errp)
 265 {
 266     CPUState *cs = CPU(obj);
 267     GuestPanicInformation *panic_info;
 268
 269     if (!cs->crash_occurred) {
 270         error_setg(errp, "No crash occurred");
 271         return;
 272     }
 273
 274     panic_info = s390_cpu_get_crash_info(cs);
 275
 276     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 277                                      errp);
 278     qapi_free_GuestPanicInformation(panic_info);
 279 }
 280
 281 static void s390_cpu_initfn(Object *obj)
 282 {
 283     CPUState *cs = CPU(obj);
 284     S390CPU *cpu = S390_CPU(obj);
 285
 286     cpu_set_cpustate_pointers(cpu);
 287     cs->halted = 1;
 288     cs->exception_index = EXCP_HLT;
 289     object_property_add(obj, "crash-information", "GuestPanicInformation",
 290                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 291     s390_cpu_model_register_props(obj);
 292 #if !defined(CONFIG_USER_ONLY)
 293     cpu->env.tod_timer =
 294         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 295     cpu->env.cpu_timer =
 296         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 297     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 298 #endif
 299 }
 300
 301 static void s390_cpu_finalize(Object *obj)
 302 {
 303 #if !defined(CONFIG_USER_ONLY)
 304     S390CPU *cpu = S390_CPU(obj);
 305
 306     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 307     g_free(cpu->irqstate);
 308 #endif
 309 }
 310
 311 #if !defined(CONFIG_USER_ONLY)
 312 static bool disabled_wait(CPUState *cpu)
 313 {
 314     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 315                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 316 }
 317
 318 static unsigned s390_count_running_cpus(void)
 319 {
 320     CPUState *cpu;
 321     int nr_running = 0;
 322
 323     CPU_FOREACH(cpu) {
 324         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 325         if (state == S390_CPU_STATE_OPERATING ||
 326             state == S390_CPU_STATE_LOAD) {
 327             if (!disabled_wait(cpu)) {
 328                 nr_running++;
 329             }
 330         }
 331     }
 332
 333     return nr_running;
 334 }
 335
 336 unsigned int s390_cpu_halt(S390CPU *cpu)
 337 {
 338     CPUState *cs = CPU(cpu);
 339     trace_cpu_halt(cs->cpu_index);
 340
 341     if (!cs->halted) {
 342         cs->halted = 1;
 343         cs->exception_index = EXCP_HLT;
 344     }
 345
 346     return s390_count_running_cpus();
 347 }
 348
 349 void s390_cpu_unhalt(S390CPU *cpu)
 350 {
 351     CPUState *cs = CPU(cpu);
 352     trace_cpu_unhalt(cs->cpu_index);
 353
 354     if (cs->halted) {
 355         cs->halted = 0;
 356         cs->exception_index = -1;
 357     }
 358 }
 359
 360 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 361  {
 362     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 363
 364     switch (cpu_state) {
 365     case S390_CPU_STATE_STOPPED:
 366     case S390_CPU_STATE_CHECK_STOP:
 367         /* halt the cpu for common infrastructure */
 368         s390_cpu_halt(cpu);
 369         break;
 370     case S390_CPU_STATE_OPERATING:
 371     case S390_CPU_STATE_LOAD:
 372         /*
 373          * Starting a CPU with a PSW WAIT bit set:
 374          * KVM: handles this internally and triggers another WAIT exit.
 375          * TCG: will actually try to continue to run. Don't unhalt, will
 376          *      be done when the CPU actually has work (an interrupt).
 377          */
 378         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 379             s390_cpu_unhalt(cpu);
 380         }
 381         break;
 382     default:
 383         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 384                      cpu_state);
 385         exit(1);
 386     }
 387     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 388         kvm_s390_set_cpu_state(cpu, cpu_state);
 389     }
 390     cpu->env.cpu_state = cpu_state;
 391
 392     return s390_count_running_cpus();
 393 }
 394
 395 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 396 {
 397     if (kvm_enabled()) {
 398         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 399     }
 400     return 0;
 401 }
 402
 403 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 404 {
 405     if (kvm_enabled()) {
 406         kvm_s390_set_max_pagesize(pagesize, errp);
 407     }
 408 }
 409
 410 void s390_cmma_reset(void)
 411 {
 412     if (kvm_enabled()) {
 413         kvm_s390_cmma_reset();
 414     }
 415 }
 416
 417 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 418                                 int vq, bool assign)
 419 {
 420     if (kvm_enabled()) {
 421         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 422     } else {
 423         return 0;
 424     }
 425 }
 426
 427 void s390_crypto_reset(void)
 428 {
 429     if (kvm_enabled()) {
 430         kvm_s390_crypto_reset();
 431     }
 432 }
 433
 434 void s390_enable_css_support(S390CPU *cpu)
 435 {
 436     if (kvm_enabled()) {
 437         kvm_s390_enable_css_support(cpu);
 438     }
 439 }
 440 #endif
 441
 442 static gchar *s390_gdb_arch_name(CPUState *cs)
 443 {
 444     return g_strdup("s390:64-bit");
 445 }
 446
 447 static Property s390x_cpu_properties[] = {
 448 #if !defined(CONFIG_USER_ONLY)
 449     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 450 #endif
 451     DEFINE_PROP_END_OF_LIST()
 452 };
 453
 454 static void s390_cpu_reset_full(DeviceState *dev)
 455 {
 456     CPUState *s = CPU(dev);
 457     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 458 }
 459
 460 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 461 {
 462     S390CPUClass *scc = S390_CPU_CLASS(oc);
 463     CPUClass *cc = CPU_CLASS(scc);
 464     DeviceClass *dc = DEVICE_CLASS(oc);
 465
 466     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 467                                     &scc->parent_realize);
 468     device_class_set_props(dc, s390x_cpu_properties);
 469     dc->user_creatable = true;
 470
 471     device_class_set_parent_reset(dc, s390_cpu_reset_full, &scc->parent_reset);
 472 #if !defined(CONFIG_USER_ONLY)
 473     scc->load_normal = s390_cpu_load_normal;
 474 #endif
 475     scc->reset = s390_cpu_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)