target/s390x/sigp.c

   1 /*
   2  * s390x SIGP instruction handling
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  * Copyright IBM Corp. 2012
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qemu-common.h"
  13 #include "cpu.h"
  14 #include "internal.h"
  15 #include "sysemu/hw_accel.h"
  16 #include "exec/address-spaces.h"
  17 #include "exec/exec-all.h"
  18 #include "sysemu/sysemu.h"
  19 #include "trace.h"
  20 #include "qapi/qapi-types-misc.h"
  21
  22 QemuMutex qemu_sigp_mutex;
  23
  24 typedef struct SigpInfo {
  25     uint64_t param;
  26     int cc;
  27     uint64_t *status_reg;
  28 } SigpInfo;
  29
  30 static void set_sigp_status(SigpInfo *si, uint64_t status)
  31 {
  32     *si->status_reg &= 0xffffffff00000000ULL;
  33     *si->status_reg |= status;
  34     si->cc = SIGP_CC_STATUS_STORED;
  35 }
  36
  37 static void sigp_sense(S390CPU *dst_cpu, SigpInfo *si)
  38 {
  39     uint8_t state = s390_cpu_get_state(dst_cpu);
  40     bool ext_call = dst_cpu->env.pending_int & INTERRUPT_EXTERNAL_CALL;
  41     uint64_t status = 0;
  42
  43     if (!tcg_enabled()) {
  44         /* handled in KVM */
  45         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
  46         return;
  47     }
  48
  49     /* sensing without locks is racy, but it's the same for real hw */
  50     if (state != S390_CPU_STATE_STOPPED && !ext_call) {
  51         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
  52     } else {
  53         if (ext_call) {
  54             status |= SIGP_STAT_EXT_CALL_PENDING;
  55         }
  56         if (state == S390_CPU_STATE_STOPPED) {
  57             status |= SIGP_STAT_STOPPED;
  58         }
  59         set_sigp_status(si, status);
  60     }
  61 }
  62
  63 static void sigp_external_call(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si)
  64 {
  65     int ret;
  66
  67     if (!tcg_enabled()) {
  68         /* handled in KVM */
  69         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
  70         return;
  71     }
  72
  73     ret = cpu_inject_external_call(dst_cpu, src_cpu->env.core_id);
  74     if (!ret) {
  75         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
  76     } else {
  77         set_sigp_status(si, SIGP_STAT_EXT_CALL_PENDING);
  78     }
  79 }
  80
  81 static void sigp_emergency(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si)
  82 {
  83     if (!tcg_enabled()) {
  84         /* handled in KVM */
  85         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
  86         return;
  87     }
  88
  89     cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id);
  90     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
  91 }
  92
  93 static void sigp_start(CPUState *cs, run_on_cpu_data arg)
  94 {
  95     S390CPU *cpu = S390_CPU(cs);
  96     SigpInfo *si = arg.host_ptr;
  97
  98     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
  99         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 100         return;
 101     }
 102
 103     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
 104     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 105 }
 106
 107 static void sigp_stop(CPUState *cs, run_on_cpu_data arg)
 108 {
 109     S390CPU *cpu = S390_CPU(cs);
 110     SigpInfo *si = arg.host_ptr;
 111
 112     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
 113         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 114         return;
 115     }
 116
 117     /* disabled wait - sleeping in user space */
 118     if (cs->halted) {
 119         s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 120     } else {
 121         /* execute the stop function */
 122         cpu->env.sigp_order = SIGP_STOP;
 123         cpu_inject_stop(cpu);
 124     }
 125     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 126 }
 127
 128 static void sigp_stop_and_store_status(CPUState *cs, run_on_cpu_data arg)
 129 {
 130     S390CPU *cpu = S390_CPU(cs);
 131     SigpInfo *si = arg.host_ptr;
 132
 133     /* disabled wait - sleeping in user space */
 134     if (s390_cpu_get_state(cpu) == S390_CPU_STATE_OPERATING && cs->halted) {
 135         s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 136     }
 137
 138     switch (s390_cpu_get_state(cpu)) {
 139     case S390_CPU_STATE_OPERATING:
 140         cpu->env.sigp_order = SIGP_STOP_STORE_STATUS;
 141         cpu_inject_stop(cpu);
 142         /* store will be performed in do_stop_interrup() */
 143         break;
 144     case S390_CPU_STATE_STOPPED:
 145         /* already stopped, just store the status */
 146         cpu_synchronize_state(cs);
 147         s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
 148         break;
 149     }
 150     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 151 }
 152
 153 static void sigp_store_status_at_address(CPUState *cs, run_on_cpu_data arg)
 154 {
 155     S390CPU *cpu = S390_CPU(cs);
 156     SigpInfo *si = arg.host_ptr;
 157     uint32_t address = si->param & 0x7ffffe00u;
 158
 159     /* cpu has to be stopped */
 160     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
 161         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 162         return;
 163     }
 164
 165     cpu_synchronize_state(cs);
 166
 167     if (s390_store_status(cpu, address, false)) {
 168         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 169         return;
 170     }
 171     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 172 }
 173
 174 #define ADTL_SAVE_LC_MASK  0xfUL
 175 static void sigp_store_adtl_status(CPUState *cs, run_on_cpu_data arg)
 176 {
 177     S390CPU *cpu = S390_CPU(cs);
 178     SigpInfo *si = arg.host_ptr;
 179     uint8_t lc = si->param & ADTL_SAVE_LC_MASK;
 180     hwaddr addr = si->param & ~ADTL_SAVE_LC_MASK;
 181     hwaddr len = 1UL << (lc ? lc : 10);
 182
 183     if (!s390_has_feat(S390_FEAT_VECTOR) &&
 184         !s390_has_feat(S390_FEAT_GUARDED_STORAGE)) {
 185         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 186         return;
 187     }
 188
 189     /* cpu has to be stopped */
 190     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
 191         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 192         return;
 193     }
 194
 195     /* address must be aligned to length */
 196     if (addr & (len - 1)) {
 197         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 198         return;
 199     }
 200
 201     /* no GS: only lc == 0 is valid */
 202     if (!s390_has_feat(S390_FEAT_GUARDED_STORAGE) &&
 203         lc != 0) {
 204         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 205         return;
 206     }
 207
 208     /* GS: 0, 10, 11, 12 are valid */
 209     if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) &&
 210         lc != 0 &&
 211         lc != 10 &&
 212         lc != 11 &&
 213         lc != 12) {
 214         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 215         return;
 216     }
 217
 218     cpu_synchronize_state(cs);
 219
 220     if (s390_store_adtl_status(cpu, addr, len)) {
 221         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 222         return;
 223     }
 224     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 225 }
 226
 227 static void sigp_restart(CPUState *cs, run_on_cpu_data arg)
 228 {
 229     S390CPU *cpu = S390_CPU(cs);
 230     SigpInfo *si = arg.host_ptr;
 231
 232     switch (s390_cpu_get_state(cpu)) {
 233     case S390_CPU_STATE_STOPPED:
 234         /* the restart irq has to be delivered prior to any other pending irq */
 235         cpu_synchronize_state(cs);
 236         /*
 237          * Set OPERATING (and unhalting) before loading the restart PSW.
 238          * load_psw() will then properly halt the CPU again if necessary (TCG).
 239          */
 240         s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
 241         do_restart_interrupt(&cpu->env);
 242         break;
 243     case S390_CPU_STATE_OPERATING:
 244         cpu_inject_restart(cpu);
 245         break;
 246     }
 247     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 248 }
 249
 250 static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg)
 251 {
 252     S390CPU *cpu = S390_CPU(cs);
 253     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 254     SigpInfo *si = arg.host_ptr;
 255
 256     cpu_synchronize_state(cs);
 257     scc->initial_cpu_reset(cs);
 258     cpu_synchronize_post_reset(cs);
 259     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 260 }
 261
 262 static void sigp_cpu_reset(CPUState *cs, run_on_cpu_data arg)
 263 {
 264     S390CPU *cpu = S390_CPU(cs);
 265     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 266     SigpInfo *si = arg.host_ptr;
 267
 268     cpu_synchronize_state(cs);
 269     scc->cpu_reset(cs);
 270     cpu_synchronize_post_reset(cs);
 271     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 272 }
 273
 274 static void sigp_set_prefix(CPUState *cs, run_on_cpu_data arg)
 275 {
 276     S390CPU *cpu = S390_CPU(cs);
 277     SigpInfo *si = arg.host_ptr;
 278     uint32_t addr = si->param & 0x7fffe000u;
 279
 280     cpu_synchronize_state(cs);
 281
 282     if (!address_space_access_valid(&address_space_memory, addr,
 283                                     sizeof(struct LowCore), false,
 284                                     MEMTXATTRS_UNSPECIFIED)) {
 285         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 286         return;
 287     }
 288
 289     /* cpu has to be stopped */
 290     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
 291         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 292         return;
 293     }
 294
 295     cpu->env.psa = addr;
 296     tlb_flush(cs);
 297     cpu_synchronize_post_init(cs);
 298     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 299 }
 300
 301 static void sigp_cond_emergency(S390CPU *src_cpu, S390CPU *dst_cpu,
 302                                 SigpInfo *si)
 303 {
 304     const uint64_t psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
 305     uint16_t p_asn, s_asn, asn;
 306     uint64_t psw_addr, psw_mask;
 307     bool idle;
 308
 309     if (!tcg_enabled()) {
 310         /* handled in KVM */
 311         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 312         return;
 313     }
 314
 315     /* this looks racy, but these values are only used when STOPPED */
 316     idle = CPU(dst_cpu)->halted;
 317     psw_addr = dst_cpu->env.psw.addr;
 318     psw_mask = dst_cpu->env.psw.mask;
 319     asn = si->param;
 320     p_asn = dst_cpu->env.cregs[4] & 0xffff;  /* Primary ASN */
 321     s_asn = dst_cpu->env.cregs[3] & 0xffff;  /* Secondary ASN */
 322
 323     if (s390_cpu_get_state(dst_cpu) != S390_CPU_STATE_STOPPED ||
 324         (psw_mask & psw_int_mask) != psw_int_mask ||
 325         (idle && psw_addr != 0) ||
 326         (!idle && (asn == p_asn || asn == s_asn))) {
 327         cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id);
 328     } else {
 329         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 330     }
 331
 332     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 333 }
 334
 335 static void sigp_sense_running(S390CPU *dst_cpu, SigpInfo *si)
 336 {
 337     if (!tcg_enabled()) {
 338         /* handled in KVM */
 339         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 340         return;
 341     }
 342
 343     /* sensing without locks is racy, but it's the same for real hw */
 344     if (!s390_has_feat(S390_FEAT_SENSE_RUNNING_STATUS)) {
 345         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 346         return;
 347     }
 348
 349     /* If halted (which includes also STOPPED), it is not running */
 350     if (CPU(dst_cpu)->halted) {
 351         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 352     } else {
 353         set_sigp_status(si, SIGP_STAT_NOT_RUNNING);
 354     }
 355 }
 356
 357 static int handle_sigp_single_dst(S390CPU *cpu, S390CPU *dst_cpu, uint8_t order,
 358                                   uint64_t param, uint64_t *status_reg)
 359 {
 360     SigpInfo si = {
 361         .param = param,
 362         .status_reg = status_reg,
 363     };
 364
 365     /* cpu available? */
 366     if (dst_cpu == NULL) {
 367         return SIGP_CC_NOT_OPERATIONAL;
 368     }
 369
 370     /* only resets can break pending orders */
 371     if (dst_cpu->env.sigp_order != 0 &&
 372         order != SIGP_CPU_RESET &&
 373         order != SIGP_INITIAL_CPU_RESET) {
 374         return SIGP_CC_BUSY;
 375     }
 376
 377     switch (order) {
 378     case SIGP_SENSE:
 379         sigp_sense(dst_cpu, &si);
 380         break;
 381     case SIGP_EXTERNAL_CALL:
 382         sigp_external_call(cpu, dst_cpu, &si);
 383         break;
 384     case SIGP_EMERGENCY:
 385         sigp_emergency(cpu, dst_cpu, &si);
 386         break;
 387     case SIGP_START:
 388         run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));
 389         break;
 390     case SIGP_STOP:
 391         run_on_cpu(CPU(dst_cpu), sigp_stop, RUN_ON_CPU_HOST_PTR(&si));
 392         break;
 393     case SIGP_RESTART:
 394         run_on_cpu(CPU(dst_cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
 395         break;
 396     case SIGP_STOP_STORE_STATUS:
 397         run_on_cpu(CPU(dst_cpu), sigp_stop_and_store_status, RUN_ON_CPU_HOST_PTR(&si));
 398         break;
 399     case SIGP_STORE_STATUS_ADDR:
 400         run_on_cpu(CPU(dst_cpu), sigp_store_status_at_address, RUN_ON_CPU_HOST_PTR(&si));
 401         break;
 402     case SIGP_STORE_ADTL_STATUS:
 403         run_on_cpu(CPU(dst_cpu), sigp_store_adtl_status, RUN_ON_CPU_HOST_PTR(&si));
 404         break;
 405     case SIGP_SET_PREFIX:
 406         run_on_cpu(CPU(dst_cpu), sigp_set_prefix, RUN_ON_CPU_HOST_PTR(&si));
 407         break;
 408     case SIGP_INITIAL_CPU_RESET:
 409         run_on_cpu(CPU(dst_cpu), sigp_initial_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
 410         break;
 411     case SIGP_CPU_RESET:
 412         run_on_cpu(CPU(dst_cpu), sigp_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
 413         break;
 414     case SIGP_COND_EMERGENCY:
 415         sigp_cond_emergency(cpu, dst_cpu, &si);
 416         break;
 417     case SIGP_SENSE_RUNNING:
 418         sigp_sense_running(dst_cpu, &si);
 419         break;
 420     default:
 421         set_sigp_status(&si, SIGP_STAT_INVALID_ORDER);
 422     }
 423
 424     return si.cc;
 425 }
 426
 427 static int sigp_set_architecture(S390CPU *cpu, uint32_t param,
 428                                  uint64_t *status_reg)
 429 {
 430     CPUState *cur_cs;
 431     S390CPU *cur_cpu;
 432     bool all_stopped = true;
 433
 434     CPU_FOREACH(cur_cs) {
 435         cur_cpu = S390_CPU(cur_cs);
 436
 437         if (cur_cpu == cpu) {
 438             continue;
 439         }
 440         if (s390_cpu_get_state(cur_cpu) != S390_CPU_STATE_STOPPED) {
 441             all_stopped = false;
 442         }
 443     }
 444
 445     *status_reg &= 0xffffffff00000000ULL;
 446
 447     /* Reject set arch order, with czam we're always in z/Arch mode. */
 448     *status_reg |= (all_stopped ? SIGP_STAT_INVALID_PARAMETER :
 449                     SIGP_STAT_INCORRECT_STATE);
 450     return SIGP_CC_STATUS_STORED;
 451 }
 452
 453 int handle_sigp(CPUS390XState *env, uint8_t order, uint64_t r1, uint64_t r3)
 454 {
 455     uint64_t *status_reg = &env->regs[r1];
 456     uint64_t param = (r1 % 2) ? env->regs[r1] : env->regs[r1 + 1];
 457     S390CPU *cpu = s390_env_get_cpu(env);
 458     S390CPU *dst_cpu = NULL;
 459     int ret;
 460
 461     if (qemu_mutex_trylock(&qemu_sigp_mutex)) {
 462         ret = SIGP_CC_BUSY;
 463         goto out;
 464     }
 465
 466     switch (order) {
 467     case SIGP_SET_ARCH:
 468         ret = sigp_set_architecture(cpu, param, status_reg);
 469         break;
 470     default:
 471         /* all other sigp orders target a single vcpu */
 472         dst_cpu = s390_cpu_addr2state(env->regs[r3]);
 473         ret = handle_sigp_single_dst(cpu, dst_cpu, order, param, status_reg);
 474     }
 475     qemu_mutex_unlock(&qemu_sigp_mutex);
 476
 477 out:
 478     trace_sigp_finished(order, CPU(cpu)->cpu_index,
 479                         dst_cpu ? CPU(dst_cpu)->cpu_index : -1, ret);
 480     g_assert(ret >= 0);
 481
 482     return ret;
 483 }
 484
 485 int s390_cpu_restart(S390CPU *cpu)
 486 {
 487     SigpInfo si = {};
 488
 489     run_on_cpu(CPU(cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
 490     return 0;
 491 }
 492
 493 void do_stop_interrupt(CPUS390XState *env)
 494 {
 495     S390CPU *cpu = s390_env_get_cpu(env);
 496
 497     if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
 498         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 499     }
 500     if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
 501         s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
 502     }
 503     env->sigp_order = 0;
 504     env->pending_int &= ~INTERRUPT_STOP;
 505 }
 506
 507 void s390_init_sigp(void)
 508 {
 509     qemu_mutex_init(&qemu_sigp_mutex);
 510 }