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 "cpu.h"
  13 #include "s390x-internal.h"
  14 #include "sysemu/hw_accel.h"
  15 #include "sysemu/runstate.h"
  16 #include "exec/address-spaces.h"
  17 #include "exec/exec-all.h"
  18 #include "sysemu/tcg.h"
  19 #include "trace.h"
  20 #include "qapi/qapi-types-machine.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_interrupt() */
 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          * s390_cpu_set_psw() will then properly halt the CPU again if
 239          * necessary (TCG).
 240          */
 241         s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
 242         do_restart_interrupt(&cpu->env);
 243         break;
 244     case S390_CPU_STATE_OPERATING:
 245         cpu_inject_restart(cpu);
 246         break;
 247     }
 248     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 249 }
 250
 251 static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg)
 252 {
 253     S390CPU *cpu = S390_CPU(cs);
 254     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 255     SigpInfo *si = arg.host_ptr;
 256
 257     cpu_synchronize_state(cs);
 258     scc->reset(cs, S390_CPU_RESET_INITIAL);
 259     cpu_synchronize_post_reset(cs);
 260     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 261 }
 262
 263 static void sigp_cpu_reset(CPUState *cs, run_on_cpu_data arg)
 264 {
 265     S390CPU *cpu = S390_CPU(cs);
 266     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 267     SigpInfo *si = arg.host_ptr;
 268
 269     cpu_synchronize_state(cs);
 270     scc->reset(cs, S390_CPU_RESET_NORMAL);
 271     cpu_synchronize_post_reset(cs);
 272     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 273 }
 274
 275 static void sigp_set_prefix(CPUState *cs, run_on_cpu_data arg)
 276 {
 277     S390CPU *cpu = S390_CPU(cs);
 278     SigpInfo *si = arg.host_ptr;
 279     uint32_t addr = si->param & 0x7fffe000u;
 280
 281     cpu_synchronize_state(cs);
 282
 283     if (!address_space_access_valid(&address_space_memory, addr,
 284                                     sizeof(struct LowCore), false,
 285                                     MEMTXATTRS_UNSPECIFIED)) {
 286         set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
 287         return;
 288     }
 289
 290     /* cpu has to be stopped */
 291     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
 292         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 293         return;
 294     }
 295
 296     cpu->env.psa = addr;
 297     tlb_flush(cs);
 298     cpu_synchronize_post_init(cs);
 299     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 300 }
 301
 302 static void sigp_cond_emergency(S390CPU *src_cpu, S390CPU *dst_cpu,
 303                                 SigpInfo *si)
 304 {
 305     const uint64_t psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
 306     uint16_t p_asn, s_asn, asn;
 307     uint64_t psw_addr, psw_mask;
 308     bool idle;
 309
 310     if (!tcg_enabled()) {
 311         /* handled in KVM */
 312         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 313         return;
 314     }
 315
 316     /* this looks racy, but these values are only used when STOPPED */
 317     idle = CPU(dst_cpu)->halted;
 318     psw_addr = dst_cpu->env.psw.addr;
 319     psw_mask = dst_cpu->env.psw.mask;
 320     asn = si->param;
 321     p_asn = dst_cpu->env.cregs[4] & 0xffff;  /* Primary ASN */
 322     s_asn = dst_cpu->env.cregs[3] & 0xffff;  /* Secondary ASN */
 323
 324     if (s390_cpu_get_state(dst_cpu) != S390_CPU_STATE_STOPPED ||
 325         (psw_mask & psw_int_mask) != psw_int_mask ||
 326         (idle && psw_addr != 0) ||
 327         (!idle && (asn == p_asn || asn == s_asn))) {
 328         cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id);
 329     } else {
 330         set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
 331     }
 332
 333     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 334 }
 335
 336 static void sigp_sense_running(S390CPU *dst_cpu, SigpInfo *si)
 337 {
 338     if (!tcg_enabled()) {
 339         /* handled in KVM */
 340         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 341         return;
 342     }
 343
 344     /* sensing without locks is racy, but it's the same for real hw */
 345     if (!s390_has_feat(S390_FEAT_SENSE_RUNNING_STATUS)) {
 346         set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
 347         return;
 348     }
 349
 350     /* If halted (which includes also STOPPED), it is not running */
 351     if (CPU(dst_cpu)->halted) {
 352         set_sigp_status(si, SIGP_STAT_NOT_RUNNING);
 353     } else {
 354         si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 355     }
 356 }
 357
 358 static int handle_sigp_single_dst(S390CPU *cpu, S390CPU *dst_cpu, uint8_t order,
 359                                   uint64_t param, uint64_t *status_reg)
 360 {
 361     SigpInfo si = {
 362         .param = param,
 363         .status_reg = status_reg,
 364     };
 365
 366     /* cpu available? */
 367     if (dst_cpu == NULL) {
 368         return SIGP_CC_NOT_OPERATIONAL;
 369     }
 370
 371     /* only resets can break pending orders */
 372     if (dst_cpu->env.sigp_order != 0 &&
 373         order != SIGP_CPU_RESET &&
 374         order != SIGP_INITIAL_CPU_RESET) {
 375         return SIGP_CC_BUSY;
 376     }
 377
 378     switch (order) {
 379     case SIGP_SENSE:
 380         sigp_sense(dst_cpu, &si);
 381         break;
 382     case SIGP_EXTERNAL_CALL:
 383         sigp_external_call(cpu, dst_cpu, &si);
 384         break;
 385     case SIGP_EMERGENCY:
 386         sigp_emergency(cpu, dst_cpu, &si);
 387         break;
 388     case SIGP_START:
 389         run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));
 390         break;
 391     case SIGP_STOP:
 392         run_on_cpu(CPU(dst_cpu), sigp_stop, RUN_ON_CPU_HOST_PTR(&si));
 393         break;
 394     case SIGP_RESTART:
 395         run_on_cpu(CPU(dst_cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
 396         break;
 397     case SIGP_STOP_STORE_STATUS:
 398         run_on_cpu(CPU(dst_cpu), sigp_stop_and_store_status, RUN_ON_CPU_HOST_PTR(&si));
 399         break;
 400     case SIGP_STORE_STATUS_ADDR:
 401         run_on_cpu(CPU(dst_cpu), sigp_store_status_at_address, RUN_ON_CPU_HOST_PTR(&si));
 402         break;
 403     case SIGP_STORE_ADTL_STATUS:
 404         run_on_cpu(CPU(dst_cpu), sigp_store_adtl_status, RUN_ON_CPU_HOST_PTR(&si));
 405         break;
 406     case SIGP_SET_PREFIX:
 407         run_on_cpu(CPU(dst_cpu), sigp_set_prefix, RUN_ON_CPU_HOST_PTR(&si));
 408         break;
 409     case SIGP_INITIAL_CPU_RESET:
 410         run_on_cpu(CPU(dst_cpu), sigp_initial_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
 411         break;
 412     case SIGP_CPU_RESET:
 413         run_on_cpu(CPU(dst_cpu), sigp_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
 414         break;
 415     case SIGP_COND_EMERGENCY:
 416         sigp_cond_emergency(cpu, dst_cpu, &si);
 417         break;
 418     case SIGP_SENSE_RUNNING:
 419         sigp_sense_running(dst_cpu, &si);
 420         break;
 421     default:
 422         set_sigp_status(&si, SIGP_STAT_INVALID_ORDER);
 423     }
 424
 425     return si.cc;
 426 }
 427
 428 static int sigp_set_architecture(S390CPU *cpu, uint32_t param,
 429                                  uint64_t *status_reg)
 430 {
 431     *status_reg &= 0xffffffff00000000ULL;
 432
 433     /* Reject set arch order, with czam we're always in z/Arch mode. */
 434     *status_reg |= SIGP_STAT_INVALID_PARAMETER;
 435     return SIGP_CC_STATUS_STORED;
 436 }
 437
 438 int handle_sigp(CPUS390XState *env, uint8_t order, uint64_t r1, uint64_t r3)
 439 {
 440     uint64_t *status_reg = &env->regs[r1];
 441     uint64_t param = (r1 % 2) ? env->regs[r1] : env->regs[r1 + 1];
 442     S390CPU *cpu = env_archcpu(env);
 443     S390CPU *dst_cpu = NULL;
 444     int ret;
 445
 446     if (qemu_mutex_trylock(&qemu_sigp_mutex)) {
 447         ret = SIGP_CC_BUSY;
 448         goto out;
 449     }
 450
 451     switch (order) {
 452     case SIGP_SET_ARCH:
 453         ret = sigp_set_architecture(cpu, param, status_reg);
 454         break;
 455     default:
 456         /* all other sigp orders target a single vcpu */
 457         dst_cpu = s390_cpu_addr2state(env->regs[r3]);
 458         ret = handle_sigp_single_dst(cpu, dst_cpu, order, param, status_reg);
 459     }
 460     qemu_mutex_unlock(&qemu_sigp_mutex);
 461
 462 out:
 463     trace_sigp_finished(order, CPU(cpu)->cpu_index,
 464                         dst_cpu ? CPU(dst_cpu)->cpu_index : -1, ret);
 465     g_assert(ret >= 0);
 466
 467     return ret;
 468 }
 469
 470 int s390_cpu_restart(S390CPU *cpu)
 471 {
 472     SigpInfo si = {};
 473
 474     run_on_cpu(CPU(cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
 475     return 0;
 476 }
 477
 478 void do_stop_interrupt(CPUS390XState *env)
 479 {
 480     S390CPU *cpu = env_archcpu(env);
 481
 482     /*
 483      * Complete the STOP operation before exposing the CPU as
 484      * STOPPED to the system.
 485      */
 486     if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
 487         s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
 488     }
 489     env->sigp_order = 0;
 490     if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
 491         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 492     }
 493     env->pending_int &= ~INTERRUPT_STOP;
 494 }
 495
 496 void s390_init_sigp(void)
 497 {
 498     qemu_mutex_init(&qemu_sigp_mutex);
 499 }