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 #endif
 149
 150     /* architectured initial value for Breaking-Event-Address register */
 151     env->gbea = 1;
 152
 153     env->pfault_token = -1UL;
 154
 155     /* tininess for underflow is detected before rounding */
 156     set_float_detect_tininess(float_tininess_before_rounding,
 157                               &env->fpu_status);
 158
 159     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 160     if (kvm_enabled()) {
 161         kvm_s390_reset_vcpu(cpu);
 162     }
 163 }
 164
 165 #if !defined(CONFIG_USER_ONLY)
 166 static void s390_cpu_machine_reset_cb(void *opaque)
 167 {
 168     S390CPU *cpu = opaque;
 169
 170     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 171 }
 172 #endif
 173
 174 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 175 {
 176     info->mach = bfd_mach_s390_64;
 177     info->print_insn = print_insn_s390;
 178 }
 179
 180 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 181 {
 182     CPUState *cs = CPU(dev);
 183     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 184 #if !defined(CONFIG_USER_ONLY)
 185     S390CPU *cpu = S390_CPU(dev);
 186 #endif
 187     Error *err = NULL;
 188
 189     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 190     s390_realize_cpu_model(cs, &err);
 191     if (err) {
 192         goto out;
 193     }
 194
 195 #if !defined(CONFIG_USER_ONLY)
 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     CPUS390XState *env = &cpu->env;
 286
 287     cs->env_ptr = env;
 288     cs->halted = 1;
 289     cs->exception_index = EXCP_HLT;
 290     object_property_add(obj, "crash-information", "GuestPanicInformation",
 291                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 292     s390_cpu_model_register_props(obj);
 293 #if !defined(CONFIG_USER_ONLY)
 294     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 295     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 296     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 297 #endif
 298 }
 299
 300 static void s390_cpu_finalize(Object *obj)
 301 {
 302 #if !defined(CONFIG_USER_ONLY)
 303     S390CPU *cpu = S390_CPU(obj);
 304
 305     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 306     g_free(cpu->irqstate);
 307 #endif
 308 }
 309
 310 #if !defined(CONFIG_USER_ONLY)
 311 static bool disabled_wait(CPUState *cpu)
 312 {
 313     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 314                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 315 }
 316
 317 static unsigned s390_count_running_cpus(void)
 318 {
 319     CPUState *cpu;
 320     int nr_running = 0;
 321
 322     CPU_FOREACH(cpu) {
 323         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 324         if (state == S390_CPU_STATE_OPERATING ||
 325             state == S390_CPU_STATE_LOAD) {
 326             if (!disabled_wait(cpu)) {
 327                 nr_running++;
 328             }
 329         }
 330     }
 331
 332     return nr_running;
 333 }
 334
 335 unsigned int s390_cpu_halt(S390CPU *cpu)
 336 {
 337     CPUState *cs = CPU(cpu);
 338     trace_cpu_halt(cs->cpu_index);
 339
 340     if (!cs->halted) {
 341         cs->halted = 1;
 342         cs->exception_index = EXCP_HLT;
 343     }
 344
 345     return s390_count_running_cpus();
 346 }
 347
 348 void s390_cpu_unhalt(S390CPU *cpu)
 349 {
 350     CPUState *cs = CPU(cpu);
 351     trace_cpu_unhalt(cs->cpu_index);
 352
 353     if (cs->halted) {
 354         cs->halted = 0;
 355         cs->exception_index = -1;
 356     }
 357 }
 358
 359 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 360  {
 361     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 362
 363     switch (cpu_state) {
 364     case S390_CPU_STATE_STOPPED:
 365     case S390_CPU_STATE_CHECK_STOP:
 366         /* halt the cpu for common infrastructure */
 367         s390_cpu_halt(cpu);
 368         break;
 369     case S390_CPU_STATE_OPERATING:
 370     case S390_CPU_STATE_LOAD:
 371         /*
 372          * Starting a CPU with a PSW WAIT bit set:
 373          * KVM: handles this internally and triggers another WAIT exit.
 374          * TCG: will actually try to continue to run. Don't unhalt, will
 375          *      be done when the CPU actually has work (an interrupt).
 376          */
 377         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 378             s390_cpu_unhalt(cpu);
 379         }
 380         break;
 381     default:
 382         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 383                      cpu_state);
 384         exit(1);
 385     }
 386     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 387         kvm_s390_set_cpu_state(cpu, cpu_state);
 388     }
 389     cpu->env.cpu_state = cpu_state;
 390
 391     return s390_count_running_cpus();
 392 }
 393
 394 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 395 {
 396     if (kvm_enabled()) {
 397         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 398     }
 399     return 0;
 400 }
 401
 402 void s390_cmma_reset(void)
 403 {
 404     if (kvm_enabled()) {
 405         kvm_s390_cmma_reset();
 406     }
 407 }
 408
 409 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 410                                 int vq, bool assign)
 411 {
 412     if (kvm_enabled()) {
 413         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 414     } else {
 415         return 0;
 416     }
 417 }
 418
 419 void s390_crypto_reset(void)
 420 {
 421     if (kvm_enabled()) {
 422         kvm_s390_crypto_reset();
 423     }
 424 }
 425
 426 void s390_enable_css_support(S390CPU *cpu)
 427 {
 428     if (kvm_enabled()) {
 429         kvm_s390_enable_css_support(cpu);
 430     }
 431 }
 432 #endif
 433
 434 static gchar *s390_gdb_arch_name(CPUState *cs)
 435 {
 436     return g_strdup("s390:64-bit");
 437 }
 438
 439 static Property s390x_cpu_properties[] = {
 440 #if !defined(CONFIG_USER_ONLY)
 441     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 442 #endif
 443     DEFINE_PROP_END_OF_LIST()
 444 };
 445
 446 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 447 {
 448     S390CPUClass *scc = S390_CPU_CLASS(oc);
 449     CPUClass *cc = CPU_CLASS(scc);
 450     DeviceClass *dc = DEVICE_CLASS(oc);
 451
 452     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 453                                     &scc->parent_realize);
 454     dc->props = s390x_cpu_properties;
 455     dc->user_creatable = true;
 456
 457     scc->parent_reset = cc->reset;
 458 #if !defined(CONFIG_USER_ONLY)
 459     scc->load_normal = s390_cpu_load_normal;
 460 #endif
 461     scc->cpu_reset = s390_cpu_reset;
 462     scc->initial_cpu_reset = s390_cpu_initial_reset;
 463     cc->reset = s390_cpu_full_reset;
 464     cc->class_by_name = s390_cpu_class_by_name,
 465     cc->has_work = s390_cpu_has_work;
 466 #ifdef CONFIG_TCG
 467     cc->do_interrupt = s390_cpu_do_interrupt;
 468 #endif
 469     cc->dump_state = s390_cpu_dump_state;
 470     cc->get_crash_info = s390_cpu_get_crash_info;
 471     cc->set_pc = s390_cpu_set_pc;
 472     cc->gdb_read_register = s390_cpu_gdb_read_register;
 473     cc->gdb_write_register = s390_cpu_gdb_write_register;
 474 #ifdef CONFIG_USER_ONLY
 475     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 476 #else
 477     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 478     cc->vmsd = &vmstate_s390_cpu;
 479     cc->write_elf64_note = s390_cpu_write_elf64_note;
 480 #ifdef CONFIG_TCG
 481     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 482     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 483     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 484 #endif
 485 #endif
 486     cc->disas_set_info = s390_cpu_disas_set_info;
 487 #ifdef CONFIG_TCG
 488     cc->tcg_initialize = s390x_translate_init;
 489 #endif
 490
 491     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 492     cc->gdb_core_xml_file = "s390x-core64.xml";
 493     cc->gdb_arch_name = s390_gdb_arch_name;
 494
 495     s390_cpu_model_class_register_props(oc);
 496 }
 497
 498 static const TypeInfo s390_cpu_type_info = {
 499     .name = TYPE_S390_CPU,
 500     .parent = TYPE_CPU,
 501     .instance_size = sizeof(S390CPU),
 502     .instance_init = s390_cpu_initfn,
 503     .instance_finalize = s390_cpu_finalize,
 504     .abstract = true,
 505     .class_size = sizeof(S390CPUClass),
 506     .class_init = s390_cpu_class_init,
 507 };
 508
 509 static void s390_cpu_register_types(void)
 510 {
 511     type_register_static(&s390_cpu_type_info);
 512 }
 513
 514 type_init(s390_cpu_register_types)