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 & 0xffffffff80000000ULL;
  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 & 0x7fffffffULL;
  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
 100     scc->parent_reset(s);
 101     cpu->env.sigp_order = 0;
 102     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 103
 104     switch (type) {
 105     case S390_CPU_RESET_CLEAR:
 106         memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
 107         /* fall through */
 108     case S390_CPU_RESET_INITIAL:
 109         /* initial reset does not clear everything! */
 110         memset(&env->start_initial_reset_fields, 0,
 111                offsetof(CPUS390XState, start_normal_reset_fields) -
 112                offsetof(CPUS390XState, start_initial_reset_fields));
 113
 114         /* architectured initial value for Breaking-Event-Address register */
 115         env->gbea = 1;
 116
 117         /* architectured initial values for CR 0 and 14 */
 118         env->cregs[0] = CR0_RESET;
 119         env->cregs[14] = CR14_RESET;
 120
 121 #if defined(CONFIG_USER_ONLY)
 122         /* user mode should always be allowed to use the full FPU */
 123         env->cregs[0] |= CR0_AFP;
 124         if (s390_has_feat(S390_FEAT_VECTOR)) {
 125             env->cregs[0] |= CR0_VECTOR;
 126         }
 127 #endif
 128
 129         /* tininess for underflow is detected before rounding */
 130         set_float_detect_tininess(float_tininess_before_rounding,
 131                                   &env->fpu_status);
 132        /* fall through */
 133     case S390_CPU_RESET_NORMAL:
 134         env->psw.mask &= ~PSW_MASK_RI;
 135         memset(&env->start_normal_reset_fields, 0,
 136                offsetof(CPUS390XState, end_reset_fields) -
 137                offsetof(CPUS390XState, start_normal_reset_fields));
 138
 139         env->pfault_token = -1UL;
 140         env->bpbc = false;
 141         break;
 142     default:
 143         g_assert_not_reached();
 144     }
 145
 146     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 147     if (kvm_enabled() && type != S390_CPU_RESET_NORMAL) {
 148         kvm_s390_reset_vcpu(cpu);
 149     }
 150 }
 151
 152 #if !defined(CONFIG_USER_ONLY)
 153 static void s390_cpu_machine_reset_cb(void *opaque)
 154 {
 155     S390CPU *cpu = opaque;
 156
 157     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 158 }
 159 #endif
 160
 161 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 162 {
 163     info->mach = bfd_mach_s390_64;
 164     info->print_insn = print_insn_s390;
 165 }
 166
 167 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 168 {
 169     CPUState *cs = CPU(dev);
 170     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 171 #if !defined(CONFIG_USER_ONLY)
 172     S390CPU *cpu = S390_CPU(dev);
 173 #endif
 174     Error *err = NULL;
 175
 176     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 177     s390_realize_cpu_model(cs, &err);
 178     if (err) {
 179         goto out;
 180     }
 181
 182 #if !defined(CONFIG_USER_ONLY)
 183     MachineState *ms = MACHINE(qdev_get_machine());
 184     unsigned int max_cpus = ms->smp.max_cpus;
 185     if (cpu->env.core_id >= max_cpus) {
 186         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 187                    ", maximum core-id: %d", cpu->env.core_id,
 188                    max_cpus - 1);
 189         goto out;
 190     }
 191
 192     if (cpu_exists(cpu->env.core_id)) {
 193         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 194                    ", it already exists", cpu->env.core_id);
 195         goto out;
 196     }
 197
 198     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 199     cs->cpu_index = cpu->env.core_id;
 200 #endif
 201
 202     cpu_exec_realizefn(cs, &err);
 203     if (err != NULL) {
 204         goto out;
 205     }
 206
 207 #if !defined(CONFIG_USER_ONLY)
 208     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 209 #endif
 210     s390_cpu_gdb_init(cs);
 211     qemu_init_vcpu(cs);
 212
 213     /*
 214      * KVM requires the initial CPU reset ioctl to be executed on the target
 215      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 216      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 217      * the main thread is already running but the CPU hasn't been realized.
 218      */
 219     if (kvm_enabled()) {
 220         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 221     } else {
 222         cpu_reset(cs);
 223     }
 224
 225     scc->parent_realize(dev, &err);
 226 out:
 227     error_propagate(errp, err);
 228 }
 229
 230 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 231 {
 232     GuestPanicInformation *panic_info;
 233     S390CPU *cpu = S390_CPU(cs);
 234
 235     cpu_synchronize_state(cs);
 236     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 237
 238     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 239 #if !defined(CONFIG_USER_ONLY)
 240     panic_info->u.s390.core = cpu->env.core_id;
 241 #else
 242     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 243 #endif
 244     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 245     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 246     panic_info->u.s390.reason = cpu->env.crash_reason;
 247
 248     return panic_info;
 249 }
 250
 251 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 252                                         const char *name, void *opaque,
 253                                         Error **errp)
 254 {
 255     CPUState *cs = CPU(obj);
 256     GuestPanicInformation *panic_info;
 257
 258     if (!cs->crash_occurred) {
 259         error_setg(errp, "No crash occurred");
 260         return;
 261     }
 262
 263     panic_info = s390_cpu_get_crash_info(cs);
 264
 265     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 266                                      errp);
 267     qapi_free_GuestPanicInformation(panic_info);
 268 }
 269
 270 static void s390_cpu_initfn(Object *obj)
 271 {
 272     CPUState *cs = CPU(obj);
 273     S390CPU *cpu = S390_CPU(obj);
 274
 275     cpu_set_cpustate_pointers(cpu);
 276     cs->halted = 1;
 277     cs->exception_index = EXCP_HLT;
 278     object_property_add(obj, "crash-information", "GuestPanicInformation",
 279                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 280     s390_cpu_model_register_props(obj);
 281 #if !defined(CONFIG_USER_ONLY)
 282     cpu->env.tod_timer =
 283         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 284     cpu->env.cpu_timer =
 285         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 286     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 287 #endif
 288 }
 289
 290 static void s390_cpu_finalize(Object *obj)
 291 {
 292 #if !defined(CONFIG_USER_ONLY)
 293     S390CPU *cpu = S390_CPU(obj);
 294
 295     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 296     g_free(cpu->irqstate);
 297 #endif
 298 }
 299
 300 #if !defined(CONFIG_USER_ONLY)
 301 static bool disabled_wait(CPUState *cpu)
 302 {
 303     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 304                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 305 }
 306
 307 static unsigned s390_count_running_cpus(void)
 308 {
 309     CPUState *cpu;
 310     int nr_running = 0;
 311
 312     CPU_FOREACH(cpu) {
 313         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 314         if (state == S390_CPU_STATE_OPERATING ||
 315             state == S390_CPU_STATE_LOAD) {
 316             if (!disabled_wait(cpu)) {
 317                 nr_running++;
 318             }
 319         }
 320     }
 321
 322     return nr_running;
 323 }
 324
 325 unsigned int s390_cpu_halt(S390CPU *cpu)
 326 {
 327     CPUState *cs = CPU(cpu);
 328     trace_cpu_halt(cs->cpu_index);
 329
 330     if (!cs->halted) {
 331         cs->halted = 1;
 332         cs->exception_index = EXCP_HLT;
 333     }
 334
 335     return s390_count_running_cpus();
 336 }
 337
 338 void s390_cpu_unhalt(S390CPU *cpu)
 339 {
 340     CPUState *cs = CPU(cpu);
 341     trace_cpu_unhalt(cs->cpu_index);
 342
 343     if (cs->halted) {
 344         cs->halted = 0;
 345         cs->exception_index = -1;
 346     }
 347 }
 348
 349 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 350  {
 351     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 352
 353     switch (cpu_state) {
 354     case S390_CPU_STATE_STOPPED:
 355     case S390_CPU_STATE_CHECK_STOP:
 356         /* halt the cpu for common infrastructure */
 357         s390_cpu_halt(cpu);
 358         break;
 359     case S390_CPU_STATE_OPERATING:
 360     case S390_CPU_STATE_LOAD:
 361         /*
 362          * Starting a CPU with a PSW WAIT bit set:
 363          * KVM: handles this internally and triggers another WAIT exit.
 364          * TCG: will actually try to continue to run. Don't unhalt, will
 365          *      be done when the CPU actually has work (an interrupt).
 366          */
 367         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 368             s390_cpu_unhalt(cpu);
 369         }
 370         break;
 371     default:
 372         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 373                      cpu_state);
 374         exit(1);
 375     }
 376     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 377         kvm_s390_set_cpu_state(cpu, cpu_state);
 378     }
 379     cpu->env.cpu_state = cpu_state;
 380
 381     return s390_count_running_cpus();
 382 }
 383
 384 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 385 {
 386     if (kvm_enabled()) {
 387         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 388     }
 389     return 0;
 390 }
 391
 392 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 393 {
 394     if (kvm_enabled()) {
 395         kvm_s390_set_max_pagesize(pagesize, errp);
 396     }
 397 }
 398
 399 void s390_cmma_reset(void)
 400 {
 401     if (kvm_enabled()) {
 402         kvm_s390_cmma_reset();
 403     }
 404 }
 405
 406 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 407                                 int vq, bool assign)
 408 {
 409     if (kvm_enabled()) {
 410         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 411     } else {
 412         return 0;
 413     }
 414 }
 415
 416 void s390_crypto_reset(void)
 417 {
 418     if (kvm_enabled()) {
 419         kvm_s390_crypto_reset();
 420     }
 421 }
 422
 423 void s390_enable_css_support(S390CPU *cpu)
 424 {
 425     if (kvm_enabled()) {
 426         kvm_s390_enable_css_support(cpu);
 427     }
 428 }
 429 #endif
 430
 431 static gchar *s390_gdb_arch_name(CPUState *cs)
 432 {
 433     return g_strdup("s390:64-bit");
 434 }
 435
 436 static Property s390x_cpu_properties[] = {
 437 #if !defined(CONFIG_USER_ONLY)
 438     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 439 #endif
 440     DEFINE_PROP_END_OF_LIST()
 441 };
 442
 443 static void s390_cpu_reset_full(CPUState *s)
 444 {
 445     return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
 446 }
 447
 448 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 449 {
 450     S390CPUClass *scc = S390_CPU_CLASS(oc);
 451     CPUClass *cc = CPU_CLASS(scc);
 452     DeviceClass *dc = DEVICE_CLASS(oc);
 453
 454     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 455                                     &scc->parent_realize);
 456     dc->props = s390x_cpu_properties;
 457     dc->user_creatable = true;
 458
 459     scc->parent_reset = cc->reset;
 460 #if !defined(CONFIG_USER_ONLY)
 461     scc->load_normal = s390_cpu_load_normal;
 462 #endif
 463     scc->reset = s390_cpu_reset;
 464     cc->reset = s390_cpu_reset_full;
 465     cc->class_by_name = s390_cpu_class_by_name,
 466     cc->has_work = s390_cpu_has_work;
 467 #ifdef CONFIG_TCG
 468     cc->do_interrupt = s390_cpu_do_interrupt;
 469 #endif
 470     cc->dump_state = s390_cpu_dump_state;
 471     cc->get_crash_info = s390_cpu_get_crash_info;
 472     cc->set_pc = s390_cpu_set_pc;
 473     cc->gdb_read_register = s390_cpu_gdb_read_register;
 474     cc->gdb_write_register = s390_cpu_gdb_write_register;
 475 #ifndef CONFIG_USER_ONLY
 476     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 477     cc->vmsd = &vmstate_s390_cpu;
 478     cc->write_elf64_note = s390_cpu_write_elf64_note;
 479 #ifdef CONFIG_TCG
 480     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 481     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 482     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 483 #endif
 484 #endif
 485     cc->disas_set_info = s390_cpu_disas_set_info;
 486 #ifdef CONFIG_TCG
 487     cc->tcg_initialize = s390x_translate_init;
 488     cc->tlb_fill = s390_cpu_tlb_fill;
 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)