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     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  80     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  81     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  82 }
  83 #endif
  84
  85 /* S390CPUClass::reset() */
  86 static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
  87 {
  88     S390CPU *cpu = S390_CPU(s);
  89     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  90     CPUS390XState *env = &cpu->env;
  91
  92     scc->parent_reset(s);
  93     cpu->env.sigp_order = 0;
  94     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
  95
  96     switch (type) {
  97     case S390_CPU_RESET_CLEAR:
  98         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
  99         /* fall through */
 100     case S390_CPU_RESET_INITIAL:
 101         /* initial reset does not clear everything! */
 102         memset(&env->start_initial_reset_fields, 0,
 103                offsetof(CPUS390XState, start_normal_reset_fields) -
 104                offsetof(CPUS390XState, start_initial_reset_fields));
 105
 106         /* architectured initial value for Breaking-Event-Address register */
 107         env->gbea = 1;
 108
 109         /* architectured initial values for CR 0 and 14 */
 110         env->cregs[0] = CR0_RESET;
 111         env->cregs[14] = CR14_RESET;
 112
 113 #if defined(CONFIG_USER_ONLY)
 114         /* user mode should always be allowed to use the full FPU */
 115         env->cregs[0] |= CR0_AFP;
 116         if (s390_has_feat(S390_FEAT_VECTOR)) {
 117             env->cregs[0] |= CR0_VECTOR;
 118         }
 119 #endif
 120
 121         /* tininess for underflow is detected before rounding */
 122         set_float_detect_tininess(float_tininess_before_rounding,
 123                                   &env->fpu_status);
 124        /* fall through */
 125     case S390_CPU_RESET_NORMAL:
 126         env->psw.mask &= ~PSW_MASK_RI;
 127         memset(&env->start_normal_reset_fields, 0,
 128                offsetof(CPUS390XState, end_reset_fields) -
 129                offsetof(CPUS390XState, start_normal_reset_fields));
 130
 131         env->pfault_token = -1UL;
 132         env->bpbc = false;
 133         break;
 134     default:
 135         g_assert_not_reached();
 136     }
 137
 138     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 139     if (kvm_enabled() && type != S390_CPU_RESET_NORMAL) {
 140         kvm_s390_reset_vcpu(cpu);
 141     }
 142 }
 143
 144 #if !defined(CONFIG_USER_ONLY)
 145 static void s390_cpu_machine_reset_cb(void *opaque)
 146 {
 147     S390CPU *cpu = opaque;
 148
 149     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 150 }
 151 #endif
 152
 153 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 154 {
 155     info->mach = bfd_mach_s390_64;
 156     info->print_insn = print_insn_s390;
 157 }
 158
 159 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 160 {
 161     CPUState *cs = CPU(dev);
 162     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 163 #if !defined(CONFIG_USER_ONLY)
 164     S390CPU *cpu = S390_CPU(dev);
 165 #endif
 166     Error *err = NULL;
 167
 168     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 169     s390_realize_cpu_model(cs, &err);
 170     if (err) {
 171         goto out;
 172     }
 173
 174 #if !defined(CONFIG_USER_ONLY)
 175     MachineState *ms = MACHINE(qdev_get_machine());
 176     unsigned int max_cpus = ms->smp.max_cpus;
 177     if (cpu->env.core_id >= max_cpus) {
 178         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 179                    ", maximum core-id: %d", cpu->env.core_id,
 180                    max_cpus - 1);
 181         goto out;
 182     }
 183
 184     if (cpu_exists(cpu->env.core_id)) {
 185         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 186                    ", it already exists", cpu->env.core_id);
 187         goto out;
 188     }
 189
 190     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 191     cs->cpu_index = cpu->env.core_id;
 192 #endif
 193
 194     cpu_exec_realizefn(cs, &err);
 195     if (err != NULL) {
 196         goto out;
 197     }
 198
 199 #if !defined(CONFIG_USER_ONLY)
 200     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 201 #endif
 202     s390_cpu_gdb_init(cs);
 203     qemu_init_vcpu(cs);
 204
 205     /*
 206      * KVM requires the initial CPU reset ioctl to be executed on the target
 207      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 208      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 209      * the main thread is already running but the CPU hasn't been realized.
 210      */
 211     if (kvm_enabled()) {
 212         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 213     } else {
 214         cpu_reset(cs);
 215     }
 216
 217     scc->parent_realize(dev, &err);
 218 out:
 219     error_propagate(errp, err);
 220 }
 221
 222 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 223 {
 224     GuestPanicInformation *panic_info;
 225     S390CPU *cpu = S390_CPU(cs);
 226
 227     cpu_synchronize_state(cs);
 228     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 229
 230     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 231 #if !defined(CONFIG_USER_ONLY)
 232     panic_info->u.s390.core = cpu->env.core_id;
 233 #else
 234     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 235 #endif
 236     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 237     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 238     panic_info->u.s390.reason = cpu->env.crash_reason;
 239
 240     return panic_info;
 241 }
 242
 243 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 244                                         const char *name, void *opaque,
 245                                         Error **errp)
 246 {
 247     CPUState *cs = CPU(obj);
 248     GuestPanicInformation *panic_info;
 249
 250     if (!cs->crash_occurred) {
 251         error_setg(errp, "No crash occurred");
 252         return;
 253     }
 254
 255     panic_info = s390_cpu_get_crash_info(cs);
 256
 257     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 258                                      errp);
 259     qapi_free_GuestPanicInformation(panic_info);
 260 }
 261
 262 static void s390_cpu_initfn(Object *obj)
 263 {
 264     CPUState *cs = CPU(obj);
 265     S390CPU *cpu = S390_CPU(obj);
 266
 267     cpu_set_cpustate_pointers(cpu);
 268     cs->halted = 1;
 269     cs->exception_index = EXCP_HLT;
 270     object_property_add(obj, "crash-information", "GuestPanicInformation",
 271                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 272     s390_cpu_model_register_props(obj);
 273 #if !defined(CONFIG_USER_ONLY)
 274     cpu->env.tod_timer =
 275         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 276     cpu->env.cpu_timer =
 277         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 278     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 279 #endif
 280 }
 281
 282 static void s390_cpu_finalize(Object *obj)
 283 {
 284 #if !defined(CONFIG_USER_ONLY)
 285     S390CPU *cpu = S390_CPU(obj);
 286
 287     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 288     g_free(cpu->irqstate);
 289 #endif
 290 }
 291
 292 #if !defined(CONFIG_USER_ONLY)
 293 static bool disabled_wait(CPUState *cpu)
 294 {
 295     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 296                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 297 }
 298
 299 static unsigned s390_count_running_cpus(void)
 300 {
 301     CPUState *cpu;
 302     int nr_running = 0;
 303
 304     CPU_FOREACH(cpu) {
 305         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 306         if (state == S390_CPU_STATE_OPERATING ||
 307             state == S390_CPU_STATE_LOAD) {
 308             if (!disabled_wait(cpu)) {
 309                 nr_running++;
 310             }
 311         }
 312     }
 313
 314     return nr_running;
 315 }
 316
 317 unsigned int s390_cpu_halt(S390CPU *cpu)
 318 {
 319     CPUState *cs = CPU(cpu);
 320     trace_cpu_halt(cs->cpu_index);
 321
 322     if (!cs->halted) {
 323         cs->halted = 1;
 324         cs->exception_index = EXCP_HLT;
 325     }
 326
 327     return s390_count_running_cpus();
 328 }
 329
 330 void s390_cpu_unhalt(S390CPU *cpu)
 331 {
 332     CPUState *cs = CPU(cpu);
 333     trace_cpu_unhalt(cs->cpu_index);
 334
 335     if (cs->halted) {
 336         cs->halted = 0;
 337         cs->exception_index = -1;
 338     }
 339 }
 340
 341 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 342  {
 343     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 344
 345     switch (cpu_state) {
 346     case S390_CPU_STATE_STOPPED:
 347     case S390_CPU_STATE_CHECK_STOP:
 348         /* halt the cpu for common infrastructure */
 349         s390_cpu_halt(cpu);
 350         break;
 351     case S390_CPU_STATE_OPERATING:
 352     case S390_CPU_STATE_LOAD:
 353         /*
 354          * Starting a CPU with a PSW WAIT bit set:
 355          * KVM: handles this internally and triggers another WAIT exit.
 356          * TCG: will actually try to continue to run. Don't unhalt, will
 357          *      be done when the CPU actually has work (an interrupt).
 358          */
 359         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 360             s390_cpu_unhalt(cpu);
 361         }
 362         break;
 363     default:
 364         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 365                      cpu_state);
 366         exit(1);
 367     }
 368     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 369         kvm_s390_set_cpu_state(cpu, cpu_state);
 370     }
 371     cpu->env.cpu_state = cpu_state;
 372
 373     return s390_count_running_cpus();
 374 }
 375
 376 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 377 {
 378     if (kvm_enabled()) {
 379         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 380     }
 381     return 0;
 382 }
 383
 384 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 385 {
 386     if (kvm_enabled()) {
 387         kvm_s390_set_max_pagesize(pagesize, errp);
 388     }
 389 }
 390
 391 void s390_cmma_reset(void)
 392 {
 393     if (kvm_enabled()) {
 394         kvm_s390_cmma_reset();
 395     }
 396 }
 397
 398 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 399                                 int vq, bool assign)
 400 {
 401     if (kvm_enabled()) {
 402         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 403     } else {
 404         return 0;
 405     }
 406 }
 407
 408 void s390_crypto_reset(void)
 409 {
 410     if (kvm_enabled()) {
 411         kvm_s390_crypto_reset();
 412     }
 413 }
 414
 415 void s390_enable_css_support(S390CPU *cpu)
 416 {
 417     if (kvm_enabled()) {
 418         kvm_s390_enable_css_support(cpu);
 419     }
 420 }
 421 #endif
 422
 423 static gchar *s390_gdb_arch_name(CPUState *cs)
 424 {
 425     return g_strdup("s390:64-bit");
 426 }
 427
 428 static Property s390x_cpu_properties[] = {
 429 #if !defined(CONFIG_USER_ONLY)
 430     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 431 #endif
 432     DEFINE_PROP_END_OF_LIST()
 433 };
 434
 435 static void s390_cpu_reset_full(CPUState *s)
 436 {
 437     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 438 }
 439
 440 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 441 {
 442     S390CPUClass *scc = S390_CPU_CLASS(oc);
 443     CPUClass *cc = CPU_CLASS(scc);
 444     DeviceClass *dc = DEVICE_CLASS(oc);
 445
 446     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 447                                     &scc->parent_realize);
 448     dc->props = s390x_cpu_properties;
 449     dc->user_creatable = true;
 450
 451     scc->parent_reset = cc->reset;
 452 #if !defined(CONFIG_USER_ONLY)
 453     scc->load_normal = s390_cpu_load_normal;
 454 #endif
 455     scc->reset = s390_cpu_reset;
 456     cc->reset = s390_cpu_reset_full;
 457     cc->class_by_name = s390_cpu_class_by_name,
 458     cc->has_work = s390_cpu_has_work;
 459 #ifdef CONFIG_TCG
 460     cc->do_interrupt = s390_cpu_do_interrupt;
 461 #endif
 462     cc->dump_state = s390_cpu_dump_state;
 463     cc->get_crash_info = s390_cpu_get_crash_info;
 464     cc->set_pc = s390_cpu_set_pc;
 465     cc->gdb_read_register = s390_cpu_gdb_read_register;
 466     cc->gdb_write_register = s390_cpu_gdb_write_register;
 467 #ifndef CONFIG_USER_ONLY
 468     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 469     cc->vmsd = &vmstate_s390_cpu;
 470     cc->write_elf64_note = s390_cpu_write_elf64_note;
 471 #ifdef CONFIG_TCG
 472     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 473     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 474     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 475 #endif
 476 #endif
 477     cc->disas_set_info = s390_cpu_disas_set_info;
 478 #ifdef CONFIG_TCG
 479     cc->tcg_initialize = s390x_translate_init;
 480     cc->tlb_fill = s390_cpu_tlb_fill;
 481 #endif
 482
 483     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 484     cc->gdb_core_xml_file = "s390x-core64.xml";
 485     cc->gdb_arch_name = s390_gdb_arch_name;
 486
 487     s390_cpu_model_class_register_props(oc);
 488 }
 489
 490 static const TypeInfo s390_cpu_type_info = {
 491     .name = TYPE_S390_CPU,
 492     .parent = TYPE_CPU,
 493     .instance_size = sizeof(S390CPU),
 494     .instance_init = s390_cpu_initfn,
 495     .instance_finalize = s390_cpu_finalize,
 496     .abstract = true,
 497     .class_size = sizeof(S390CPUClass),
 498     .class_init = s390_cpu_class_init,
 499 };
 500
 501 static void s390_cpu_register_types(void)
 502 {
 503     type_register_static(&s390_cpu_type_info);
 504 }
 505
 506 type_init(s390_cpu_register_types)