target-s390x/kvm.c

   1 /*
   2  * QEMU S390x KVM implementation
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  * Copyright IBM Corp. 2012
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * Contributions after 2012-10-29 are licensed under the terms of the
  18  * GNU GPL, version 2 or (at your option) any later version.
  19  *
  20  * You should have received a copy of the GNU (Lesser) General Public
  21  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/mman.h>
  27
  28 #include <linux/kvm.h>
  29 #include <asm/ptrace.h>
  30
  31 #include "qemu-common.h"
  32 #include "qemu/timer.h"
  33 #include "sysemu/sysemu.h"
  34 #include "sysemu/kvm.h"
  35 #include "cpu.h"
  36 #include "sysemu/device_tree.h"
  37
  38 /* #define DEBUG_KVM */
  39
  40 #ifdef DEBUG_KVM
  41 #define dprintf(fmt, ...) \
  42     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  43 #else
  44 #define dprintf(fmt, ...) \
  45     do { } while (0)
  46 #endif
  47
  48 #define IPA0_DIAG                       0x8300
  49 #define IPA0_SIGP                       0xae00
  50 #define IPA0_B2                         0xb200
  51 #define IPA0_B9                         0xb900
  52 #define IPA0_EB                         0xeb00
  53
  54 #define PRIV_SCLP_CALL                  0x20
  55 #define PRIV_CSCH                       0x30
  56 #define PRIV_HSCH                       0x31
  57 #define PRIV_MSCH                       0x32
  58 #define PRIV_SSCH                       0x33
  59 #define PRIV_STSCH                      0x34
  60 #define PRIV_TSCH                       0x35
  61 #define PRIV_TPI                        0x36
  62 #define PRIV_SAL                        0x37
  63 #define PRIV_RSCH                       0x38
  64 #define PRIV_STCRW                      0x39
  65 #define PRIV_STCPS                      0x3a
  66 #define PRIV_RCHP                       0x3b
  67 #define PRIV_SCHM                       0x3c
  68 #define PRIV_CHSC                       0x5f
  69 #define PRIV_SIGA                       0x74
  70 #define PRIV_XSCH                       0x76
  71 #define PRIV_SQBS                       0x8a
  72 #define PRIV_EQBS                       0x9c
  73 #define DIAG_KVM_HYPERCALL              0x500
  74 #define DIAG_KVM_BREAKPOINT             0x501
  75
  76 #define ICPT_INSTRUCTION                0x04
  77 #define ICPT_WAITPSW                    0x1c
  78 #define ICPT_SOFT_INTERCEPT             0x24
  79 #define ICPT_CPU_STOP                   0x28
  80 #define ICPT_IO                         0x40
  81
  82 #define SIGP_RESTART                    0x06
  83 #define SIGP_INITIAL_CPU_RESET          0x0b
  84 #define SIGP_STORE_STATUS_ADDR          0x0e
  85 #define SIGP_SET_ARCH                   0x12
  86
  87 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  88     KVM_CAP_LAST_INFO
  89 };
  90
  91 static int cap_sync_regs;
  92
  93 int kvm_arch_init(KVMState *s)
  94 {
  95     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  96     return 0;
  97 }
  98
  99 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 100 {
 101     return cpu->cpu_index;
 102 }
 103
 104 int kvm_arch_init_vcpu(CPUState *cpu)
 105 {
 106     /* nothing todo yet */
 107     return 0;
 108 }
 109
 110 void kvm_arch_reset_vcpu(CPUState *cpu)
 111 {
 112     /* The initial reset call is needed here to reset in-kernel
 113      * vcpu data that we can't access directly from QEMU
 114      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 115      * Before this ioctl cpu_synchronize_state() is called in common kvm
 116      * code (kvm-all) */
 117     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 118         perror("Can't reset vcpu\n");
 119     }
 120 }
 121
 122 int kvm_arch_put_registers(CPUState *cs, int level)
 123 {
 124     S390CPU *cpu = S390_CPU(cs);
 125     CPUS390XState *env = &cpu->env;
 126     struct kvm_sregs sregs;
 127     struct kvm_regs regs;
 128     int ret;
 129     int i;
 130
 131     /* always save the PSW  and the GPRS*/
 132     cs->kvm_run->psw_addr = env->psw.addr;
 133     cs->kvm_run->psw_mask = env->psw.mask;
 134
 135     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 136         for (i = 0; i < 16; i++) {
 137             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 138             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 139         }
 140     } else {
 141         for (i = 0; i < 16; i++) {
 142             regs.gprs[i] = env->regs[i];
 143         }
 144         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 145         if (ret < 0) {
 146             return ret;
 147         }
 148     }
 149
 150     /* Do we need to save more than that? */
 151     if (level == KVM_PUT_RUNTIME_STATE) {
 152         return 0;
 153     }
 154
 155     if (cap_sync_regs &&
 156         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 157         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 158         for (i = 0; i < 16; i++) {
 159             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 160             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 161         }
 162         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 163         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 164     } else {
 165         for (i = 0; i < 16; i++) {
 166             sregs.acrs[i] = env->aregs[i];
 167             sregs.crs[i] = env->cregs[i];
 168         }
 169         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 170         if (ret < 0) {
 171             return ret;
 172         }
 173     }
 174
 175     /* Finally the prefix */
 176     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 177         cs->kvm_run->s.regs.prefix = env->psa;
 178         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 179     } else {
 180         /* prefix is only supported via sync regs */
 181     }
 182     return 0;
 183 }
 184
 185 int kvm_arch_get_registers(CPUState *cs)
 186 {
 187     S390CPU *cpu = S390_CPU(cs);
 188     CPUS390XState *env = &cpu->env;
 189     struct kvm_sregs sregs;
 190     struct kvm_regs regs;
 191     int ret;
 192     int i;
 193
 194     /* get the PSW */
 195     env->psw.addr = cs->kvm_run->psw_addr;
 196     env->psw.mask = cs->kvm_run->psw_mask;
 197
 198     /* the GPRS */
 199     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 200         for (i = 0; i < 16; i++) {
 201             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 202         }
 203     } else {
 204         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 205         if (ret < 0) {
 206             return ret;
 207         }
 208          for (i = 0; i < 16; i++) {
 209             env->regs[i] = regs.gprs[i];
 210         }
 211     }
 212
 213     /* The ACRS and CRS */
 214     if (cap_sync_regs &&
 215         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 216         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 217         for (i = 0; i < 16; i++) {
 218             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 219             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 220         }
 221     } else {
 222         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 223         if (ret < 0) {
 224             return ret;
 225         }
 226          for (i = 0; i < 16; i++) {
 227             env->aregs[i] = sregs.acrs[i];
 228             env->cregs[i] = sregs.crs[i];
 229         }
 230     }
 231
 232     /* Finally the prefix */
 233     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 234         env->psa = cs->kvm_run->s.regs.prefix;
 235     } else {
 236         /* no prefix without sync regs */
 237     }
 238
 239     return 0;
 240 }
 241
 242 /*
 243  * Legacy layout for s390:
 244  * Older S390 KVM requires the topmost vma of the RAM to be
 245  * smaller than an system defined value, which is at least 256GB.
 246  * Larger systems have larger values. We put the guest between
 247  * the end of data segment (system break) and this value. We
 248  * use 32GB as a base to have enough room for the system break
 249  * to grow. We also have to use MAP parameters that avoid
 250  * read-only mapping of guest pages.
 251  */
 252 static void *legacy_s390_alloc(ram_addr_t size)
 253 {
 254     void *mem;
 255
 256     mem = mmap((void *) 0x800000000ULL, size,
 257                PROT_EXEC|PROT_READ|PROT_WRITE,
 258                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 259     if (mem == MAP_FAILED) {
 260         fprintf(stderr, "Allocating RAM failed\n");
 261         abort();
 262     }
 263     return mem;
 264 }
 265
 266 void *kvm_arch_vmalloc(ram_addr_t size)
 267 {
 268     /* Can we use the standard allocation ? */
 269     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 270         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 271         return NULL;
 272     } else {
 273         return legacy_s390_alloc(size);
 274     }
 275 }
 276
 277 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 278 {
 279     S390CPU *cpu = S390_CPU(cs);
 280     CPUS390XState *env = &cpu->env;
 281     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 282
 283     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 284         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 285         return -EINVAL;
 286     }
 287     return 0;
 288 }
 289
 290 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 291 {
 292     S390CPU *cpu = S390_CPU(cs);
 293     CPUS390XState *env = &cpu->env;
 294     uint8_t t[4];
 295     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 296
 297     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 298         return -EINVAL;
 299     } else if (memcmp(t, diag_501, 4)) {
 300         return -EINVAL;
 301     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 302         return -EINVAL;
 303     }
 304
 305     return 0;
 306 }
 307
 308 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 309 {
 310 }
 311
 312 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 313 {
 314 }
 315
 316 int kvm_arch_process_async_events(CPUState *cs)
 317 {
 318     S390CPU *cpu = S390_CPU(cs);
 319     return cpu->env.halted;
 320 }
 321
 322 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 323                                  uint64_t parm64, int vm)
 324 {
 325     CPUState *cs = CPU(cpu);
 326     struct kvm_s390_interrupt kvmint;
 327     int r;
 328
 329     if (!cs->kvm_state) {
 330         return;
 331     }
 332
 333     kvmint.type = type;
 334     kvmint.parm = parm;
 335     kvmint.parm64 = parm64;
 336
 337     if (vm) {
 338         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 339     } else {
 340         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 341     }
 342
 343     if (r < 0) {
 344         fprintf(stderr, "KVM failed to inject interrupt\n");
 345         exit(1);
 346     }
 347 }
 348
 349 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 350 {
 351     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 352                                 token, 1);
 353 }
 354
 355 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 356 {
 357     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 358 }
 359
 360 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 361 {
 362     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 363 }
 364
 365 static inline void setcc(S390CPU *cpu, uint64_t cc)
 366 {
 367     CPUS390XState *env = &cpu->env;
 368     CPUState *cs = CPU(cpu);
 369
 370     cs->kvm_run->psw_mask &= ~(3ull << 44);
 371     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 372
 373     env->psw.mask &= ~(3ul << 44);
 374     env->psw.mask |= (cc & 3) << 44;
 375 }
 376
 377 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 378                                  uint16_t ipbh0)
 379 {
 380     CPUS390XState *env = &cpu->env;
 381     uint32_t sccb;
 382     uint64_t code;
 383     int r = 0;
 384
 385     cpu_synchronize_state(env);
 386     sccb = env->regs[ipbh0 & 0xf];
 387     code = env->regs[(ipbh0 & 0xf0) >> 4];
 388
 389     r = sclp_service_call(sccb, code);
 390     if (r < 0) {
 391         enter_pgmcheck(cpu, -r);
 392     }
 393     setcc(cpu, r);
 394
 395     return 0;
 396 }
 397
 398 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 399                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 400 {
 401     int r = 0;
 402     int no_cc = 0;
 403     CPUS390XState *env = &cpu->env;
 404
 405     if (ipa0 != 0xb2) {
 406         /* Not handled for now. */
 407         return -1;
 408     }
 409     cpu_synchronize_state(env);
 410     switch (ipa1) {
 411     case PRIV_XSCH:
 412         r = ioinst_handle_xsch(env, env->regs[1]);
 413         break;
 414     case PRIV_CSCH:
 415         r = ioinst_handle_csch(env, env->regs[1]);
 416         break;
 417     case PRIV_HSCH:
 418         r = ioinst_handle_hsch(env, env->regs[1]);
 419         break;
 420     case PRIV_MSCH:
 421         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 422         break;
 423     case PRIV_SSCH:
 424         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 425         break;
 426     case PRIV_STCRW:
 427         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 428         break;
 429     case PRIV_STSCH:
 430         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 431         break;
 432     case PRIV_TSCH:
 433         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 434         fprintf(stderr, "Spurious tsch intercept\n");
 435         break;
 436     case PRIV_CHSC:
 437         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 438         break;
 439     case PRIV_TPI:
 440         /* This should have been handled by kvm already. */
 441         fprintf(stderr, "Spurious tpi intercept\n");
 442         break;
 443     case PRIV_SCHM:
 444         no_cc = 1;
 445         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 446                                run->s390_sieic.ipb);
 447         break;
 448     case PRIV_RSCH:
 449         r = ioinst_handle_rsch(env, env->regs[1]);
 450         break;
 451     case PRIV_RCHP:
 452         r = ioinst_handle_rchp(env, env->regs[1]);
 453         break;
 454     case PRIV_STCPS:
 455         /* We do not provide this instruction, it is suppressed. */
 456         no_cc = 1;
 457         r = 0;
 458         break;
 459     case PRIV_SAL:
 460         no_cc = 1;
 461         r = ioinst_handle_sal(env, env->regs[1]);
 462         break;
 463     default:
 464         r = -1;
 465         break;
 466     }
 467
 468     if (r >= 0) {
 469         if (!no_cc) {
 470             setcc(cpu, r);
 471         }
 472         r = 0;
 473     } else if (r < -1) {
 474         r = 0;
 475     }
 476     return r;
 477 }
 478
 479 static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 480 {
 481     int ret = 0;
 482     uint16_t ipa = (ipa0 << 8) | ipa1;
 483
 484     switch (ipa) {
 485     case IPA0_B2 | PRIV_CSCH:
 486     case IPA0_B2 | PRIV_HSCH:
 487     case IPA0_B2 | PRIV_MSCH:
 488     case IPA0_B2 | PRIV_SSCH:
 489     case IPA0_B2 | PRIV_STSCH:
 490     case IPA0_B2 | PRIV_TPI:
 491     case IPA0_B2 | PRIV_SAL:
 492     case IPA0_B2 | PRIV_RSCH:
 493     case IPA0_B2 | PRIV_STCRW:
 494     case IPA0_B2 | PRIV_STCPS:
 495     case IPA0_B2 | PRIV_RCHP:
 496     case IPA0_B2 | PRIV_SCHM:
 497     case IPA0_B2 | PRIV_CHSC:
 498     case IPA0_B2 | PRIV_SIGA:
 499     case IPA0_B2 | PRIV_XSCH:
 500     case IPA0_B9 | PRIV_EQBS:
 501     case IPA0_EB | PRIV_SQBS:
 502         ret = 1;
 503         break;
 504     }
 505
 506     return ret;
 507 }
 508
 509 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 510                        uint8_t ipa0, uint8_t ipa1)
 511 {
 512     int r = 0;
 513     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 514     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 515
 516     dprintf("KVM: PRIV: %d\n", ipa1);
 517     switch (ipa1) {
 518         case PRIV_SCLP_CALL:
 519             r = kvm_sclp_service_call(cpu, run, ipbh0);
 520             break;
 521         default:
 522             if (is_ioinst(ipa0, ipa1, ipb)) {
 523                 r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 524                 if (r == -1) {
 525                     setcc(cpu, 3);
 526                     r = 0;
 527                 }
 528             } else {
 529                 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 530                 r = -1;
 531             }
 532             break;
 533     }
 534
 535     return r;
 536 }
 537
 538 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 539 {
 540     cpu_synchronize_state(env);
 541     env->regs[2] = s390_virtio_hypercall(env);
 542
 543     return 0;
 544 }
 545
 546 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 547 {
 548     int r = 0;
 549
 550     switch (ipb_code) {
 551         case DIAG_KVM_HYPERCALL:
 552             r = handle_hypercall(env, run);
 553             break;
 554         case DIAG_KVM_BREAKPOINT:
 555             sleep(10);
 556             break;
 557         default:
 558             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 559             r = -1;
 560             break;
 561     }
 562
 563     return r;
 564 }
 565
 566 static int s390_cpu_restart(S390CPU *cpu)
 567 {
 568     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 569     s390_add_running_cpu(cpu);
 570     qemu_cpu_kick(CPU(cpu));
 571     dprintf("DONE: SIGP cpu restart: %p\n", &cpu->env);
 572     return 0;
 573 }
 574
 575 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 576 {
 577     /* XXX */
 578     fprintf(stderr, "XXX SIGP store status\n");
 579     return -1;
 580 }
 581
 582 static int s390_cpu_initial_reset(S390CPU *cpu)
 583 {
 584     CPUS390XState *env = &cpu->env;
 585     int i;
 586
 587     s390_del_running_cpu(cpu);
 588     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 589         perror("cannot init reset vcpu");
 590     }
 591
 592     /* Manually zero out all registers */
 593     cpu_synchronize_state(env);
 594     for (i = 0; i < 16; i++) {
 595         env->regs[i] = 0;
 596     }
 597
 598     dprintf("DONE: SIGP initial reset: %p\n", env);
 599     return 0;
 600 }
 601
 602 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 603 {
 604     CPUS390XState *env = &cpu->env;
 605     uint8_t order_code;
 606     uint32_t parameter;
 607     uint16_t cpu_addr;
 608     uint8_t t;
 609     int r = -1;
 610     S390CPU *target_cpu;
 611     CPUS390XState *target_env;
 612
 613     cpu_synchronize_state(env);
 614
 615     /* get order code */
 616     order_code = run->s390_sieic.ipb >> 28;
 617     if (order_code > 0) {
 618         order_code = env->regs[order_code];
 619     }
 620     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 621
 622     /* get parameters */
 623     t = (ipa1 & 0xf0) >> 4;
 624     if (!(t % 2)) {
 625         t++;
 626     }
 627
 628     parameter = env->regs[t] & 0x7ffffe00;
 629     cpu_addr = env->regs[ipa1 & 0x0f];
 630
 631     target_cpu = s390_cpu_addr2state(cpu_addr);
 632     if (target_cpu == NULL) {
 633         goto out;
 634     }
 635     target_env = &target_cpu->env;
 636
 637     switch (order_code) {
 638         case SIGP_RESTART:
 639             r = s390_cpu_restart(target_cpu);
 640             break;
 641         case SIGP_STORE_STATUS_ADDR:
 642             r = s390_store_status(target_env, parameter);
 643             break;
 644         case SIGP_SET_ARCH:
 645             /* make the caller panic */
 646             return -1;
 647         case SIGP_INITIAL_CPU_RESET:
 648             r = s390_cpu_initial_reset(target_cpu);
 649             break;
 650         default:
 651             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 652             break;
 653     }
 654
 655 out:
 656     setcc(cpu, r ? 3 : 0);
 657     return 0;
 658 }
 659
 660 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 661 {
 662     CPUS390XState *env = &cpu->env;
 663     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 664     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 665     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 666     int r = -1;
 667
 668     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 669     switch (ipa0) {
 670     case IPA0_B2:
 671     case IPA0_B9:
 672     case IPA0_EB:
 673         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 674         break;
 675     case IPA0_DIAG:
 676         r = handle_diag(env, run, ipb_code);
 677         break;
 678     case IPA0_SIGP:
 679         r = handle_sigp(cpu, run, ipa1);
 680         break;
 681     }
 682
 683     if (r < 0) {
 684         enter_pgmcheck(cpu, 0x0001);
 685     }
 686     return 0;
 687 }
 688
 689 static bool is_special_wait_psw(CPUState *cs)
 690 {
 691     /* signal quiesce */
 692     return cs->kvm_run->psw_addr == 0xfffUL;
 693 }
 694
 695 static int handle_intercept(S390CPU *cpu)
 696 {
 697     CPUState *cs = CPU(cpu);
 698     struct kvm_run *run = cs->kvm_run;
 699     int icpt_code = run->s390_sieic.icptcode;
 700     int r = 0;
 701
 702     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 703             (long)cs->kvm_run->psw_addr);
 704     switch (icpt_code) {
 705         case ICPT_INSTRUCTION:
 706             r = handle_instruction(cpu, run);
 707             break;
 708         case ICPT_WAITPSW:
 709             if (s390_del_running_cpu(cpu) == 0 &&
 710                 is_special_wait_psw(cs)) {
 711                 qemu_system_shutdown_request();
 712             }
 713             r = EXCP_HALTED;
 714             break;
 715         case ICPT_CPU_STOP:
 716             if (s390_del_running_cpu(cpu) == 0) {
 717                 qemu_system_shutdown_request();
 718             }
 719             r = EXCP_HALTED;
 720             break;
 721         case ICPT_SOFT_INTERCEPT:
 722             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 723             exit(1);
 724             break;
 725         case ICPT_IO:
 726             fprintf(stderr, "KVM unimplemented icpt IO\n");
 727             exit(1);
 728             break;
 729         default:
 730             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 731             exit(1);
 732             break;
 733     }
 734
 735     return r;
 736 }
 737
 738 static int handle_tsch(S390CPU *cpu)
 739 {
 740     CPUS390XState *env = &cpu->env;
 741     CPUState *cs = CPU(cpu);
 742     struct kvm_run *run = cs->kvm_run;
 743     int ret;
 744
 745     cpu_synchronize_state(env);
 746     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 747     if (ret >= 0) {
 748         /* Success; set condition code. */
 749         setcc(cpu, ret);
 750         ret = 0;
 751     } else if (ret < -1) {
 752         /*
 753          * Failure.
 754          * If an I/O interrupt had been dequeued, we have to reinject it.
 755          */
 756         if (run->s390_tsch.dequeued) {
 757             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 758             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 759             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 760             uint32_t io_int_word = run->s390_tsch.io_int_word;
 761             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 762                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 763
 764             kvm_s390_interrupt_internal(cpu, type,
 765                                         ((uint32_t)subchannel_id << 16)
 766                                         | subchannel_nr,
 767                                         ((uint64_t)io_int_parm << 32)
 768                                         | io_int_word, 1);
 769         }
 770         ret = 0;
 771     }
 772     return ret;
 773 }
 774
 775 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 776 {
 777     S390CPU *cpu = S390_CPU(cs);
 778     int ret = 0;
 779
 780     switch (run->exit_reason) {
 781         case KVM_EXIT_S390_SIEIC:
 782             ret = handle_intercept(cpu);
 783             break;
 784         case KVM_EXIT_S390_RESET:
 785             qemu_system_reset_request();
 786             break;
 787         case KVM_EXIT_S390_TSCH:
 788             ret = handle_tsch(cpu);
 789             break;
 790         default:
 791             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 792             break;
 793     }
 794
 795     if (ret == 0) {
 796         ret = EXCP_INTERRUPT;
 797     }
 798     return ret;
 799 }
 800
 801 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 802 {
 803     return true;
 804 }
 805
 806 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 807 {
 808     return 1;
 809 }
 810
 811 int kvm_arch_on_sigbus(int code, void *addr)
 812 {
 813     return 1;
 814 }
 815
 816 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 817                            uint16_t subchannel_nr, uint32_t io_int_parm,
 818                            uint32_t io_int_word)
 819 {
 820     uint32_t type;
 821
 822     type = ((subchannel_id & 0xff00) << 24) |
 823         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 824     kvm_s390_interrupt_internal(cpu, type,
 825                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 826                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 827 }
 828
 829 void kvm_s390_crw_mchk(S390CPU *cpu)
 830 {
 831     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 832                                 0x00400f1d40330000, 1);
 833 }
 834
 835 void kvm_s390_enable_css_support(S390CPU *cpu)
 836 {
 837     struct kvm_enable_cap cap = {};
 838     int r;
 839
 840     /* Activate host kernel channel subsystem support. */
 841     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 842     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 843     assert(r == 0);
 844 }