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     int ret = 0;
 107
 108     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
 109         perror("cannot init reset vcpu");
 110     }
 111
 112     return ret;
 113 }
 114
 115 void kvm_arch_reset_vcpu(CPUState *cpu)
 116 {
 117     /* The initial reset call is needed here to reset in-kernel
 118      * vcpu data that we can't access directly from QEMU
 119      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 120      * Before this ioctl cpu_synchronize_state() is called in common kvm
 121      * code (kvm-all) */
 122     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 123         perror("Can't reset vcpu\n");
 124     }
 125 }
 126
 127 int kvm_arch_put_registers(CPUState *cs, int level)
 128 {
 129     S390CPU *cpu = S390_CPU(cs);
 130     CPUS390XState *env = &cpu->env;
 131     struct kvm_sregs sregs;
 132     struct kvm_regs regs;
 133     int ret;
 134     int i;
 135
 136     /* always save the PSW  and the GPRS*/
 137     cs->kvm_run->psw_addr = env->psw.addr;
 138     cs->kvm_run->psw_mask = env->psw.mask;
 139
 140     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 141         for (i = 0; i < 16; i++) {
 142             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 143             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 144         }
 145     } else {
 146         for (i = 0; i < 16; i++) {
 147             regs.gprs[i] = env->regs[i];
 148         }
 149         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 150         if (ret < 0) {
 151             return ret;
 152         }
 153     }
 154
 155     /* Do we need to save more than that? */
 156     if (level == KVM_PUT_RUNTIME_STATE) {
 157         return 0;
 158     }
 159
 160     if (cap_sync_regs &&
 161         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 162         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 163         for (i = 0; i < 16; i++) {
 164             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 165             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 166         }
 167         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 168         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 169     } else {
 170         for (i = 0; i < 16; i++) {
 171             sregs.acrs[i] = env->aregs[i];
 172             sregs.crs[i] = env->cregs[i];
 173         }
 174         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 175         if (ret < 0) {
 176             return ret;
 177         }
 178     }
 179
 180     /* Finally the prefix */
 181     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 182         cs->kvm_run->s.regs.prefix = env->psa;
 183         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 184     } else {
 185         /* prefix is only supported via sync regs */
 186     }
 187     return 0;
 188 }
 189
 190 int kvm_arch_get_registers(CPUState *cs)
 191 {
 192     S390CPU *cpu = S390_CPU(cs);
 193     CPUS390XState *env = &cpu->env;
 194     struct kvm_sregs sregs;
 195     struct kvm_regs regs;
 196     int ret;
 197     int i;
 198
 199     /* get the PSW */
 200     env->psw.addr = cs->kvm_run->psw_addr;
 201     env->psw.mask = cs->kvm_run->psw_mask;
 202
 203     /* the GPRS */
 204     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 205         for (i = 0; i < 16; i++) {
 206             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 207         }
 208     } else {
 209         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 210         if (ret < 0) {
 211             return ret;
 212         }
 213          for (i = 0; i < 16; i++) {
 214             env->regs[i] = regs.gprs[i];
 215         }
 216     }
 217
 218     /* The ACRS and CRS */
 219     if (cap_sync_regs &&
 220         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 221         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 222         for (i = 0; i < 16; i++) {
 223             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 224             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 225         }
 226     } else {
 227         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 228         if (ret < 0) {
 229             return ret;
 230         }
 231          for (i = 0; i < 16; i++) {
 232             env->aregs[i] = sregs.acrs[i];
 233             env->cregs[i] = sregs.crs[i];
 234         }
 235     }
 236
 237     /* Finally the prefix */
 238     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 239         env->psa = cs->kvm_run->s.regs.prefix;
 240     } else {
 241         /* no prefix without sync regs */
 242     }
 243
 244     return 0;
 245 }
 246
 247 /*
 248  * Legacy layout for s390:
 249  * Older S390 KVM requires the topmost vma of the RAM to be
 250  * smaller than an system defined value, which is at least 256GB.
 251  * Larger systems have larger values. We put the guest between
 252  * the end of data segment (system break) and this value. We
 253  * use 32GB as a base to have enough room for the system break
 254  * to grow. We also have to use MAP parameters that avoid
 255  * read-only mapping of guest pages.
 256  */
 257 static void *legacy_s390_alloc(ram_addr_t size)
 258 {
 259     void *mem;
 260
 261     mem = mmap((void *) 0x800000000ULL, size,
 262                PROT_EXEC|PROT_READ|PROT_WRITE,
 263                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 264     if (mem == MAP_FAILED) {
 265         fprintf(stderr, "Allocating RAM failed\n");
 266         abort();
 267     }
 268     return mem;
 269 }
 270
 271 void *kvm_arch_vmalloc(ram_addr_t size)
 272 {
 273     /* Can we use the standard allocation ? */
 274     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 275         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 276         return NULL;
 277     } else {
 278         return legacy_s390_alloc(size);
 279     }
 280 }
 281
 282 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 283 {
 284     S390CPU *cpu = S390_CPU(cs);
 285     CPUS390XState *env = &cpu->env;
 286     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 287
 288     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 289         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 290         return -EINVAL;
 291     }
 292     return 0;
 293 }
 294
 295 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 296 {
 297     S390CPU *cpu = S390_CPU(cs);
 298     CPUS390XState *env = &cpu->env;
 299     uint8_t t[4];
 300     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 301
 302     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 303         return -EINVAL;
 304     } else if (memcmp(t, diag_501, 4)) {
 305         return -EINVAL;
 306     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 307         return -EINVAL;
 308     }
 309
 310     return 0;
 311 }
 312
 313 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 314 {
 315 }
 316
 317 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 318 {
 319 }
 320
 321 int kvm_arch_process_async_events(CPUState *cs)
 322 {
 323     S390CPU *cpu = S390_CPU(cs);
 324     return cpu->env.halted;
 325 }
 326
 327 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 328                                  uint64_t parm64, int vm)
 329 {
 330     CPUState *cs = CPU(cpu);
 331     struct kvm_s390_interrupt kvmint;
 332     int r;
 333
 334     if (!cs->kvm_state) {
 335         return;
 336     }
 337
 338     kvmint.type = type;
 339     kvmint.parm = parm;
 340     kvmint.parm64 = parm64;
 341
 342     if (vm) {
 343         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 344     } else {
 345         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 346     }
 347
 348     if (r < 0) {
 349         fprintf(stderr, "KVM failed to inject interrupt\n");
 350         exit(1);
 351     }
 352 }
 353
 354 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 355 {
 356     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 357                                 token, 1);
 358 }
 359
 360 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 361 {
 362     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 363 }
 364
 365 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 366 {
 367     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 368 }
 369
 370 static inline void setcc(S390CPU *cpu, uint64_t cc)
 371 {
 372     CPUS390XState *env = &cpu->env;
 373     CPUState *cs = CPU(cpu);
 374
 375     cs->kvm_run->psw_mask &= ~(3ull << 44);
 376     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 377
 378     env->psw.mask &= ~(3ul << 44);
 379     env->psw.mask |= (cc & 3) << 44;
 380 }
 381
 382 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 383                                  uint16_t ipbh0)
 384 {
 385     CPUS390XState *env = &cpu->env;
 386     uint32_t sccb;
 387     uint64_t code;
 388     int r = 0;
 389
 390     cpu_synchronize_state(env);
 391     sccb = env->regs[ipbh0 & 0xf];
 392     code = env->regs[(ipbh0 & 0xf0) >> 4];
 393
 394     r = sclp_service_call(sccb, code);
 395     if (r < 0) {
 396         enter_pgmcheck(cpu, -r);
 397     }
 398     setcc(cpu, r);
 399
 400     return 0;
 401 }
 402
 403 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 404                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 405 {
 406     int r = 0;
 407     int no_cc = 0;
 408     CPUS390XState *env = &cpu->env;
 409
 410     if (ipa0 != 0xb2) {
 411         /* Not handled for now. */
 412         return -1;
 413     }
 414     cpu_synchronize_state(env);
 415     switch (ipa1) {
 416     case PRIV_XSCH:
 417         r = ioinst_handle_xsch(env, env->regs[1]);
 418         break;
 419     case PRIV_CSCH:
 420         r = ioinst_handle_csch(env, env->regs[1]);
 421         break;
 422     case PRIV_HSCH:
 423         r = ioinst_handle_hsch(env, env->regs[1]);
 424         break;
 425     case PRIV_MSCH:
 426         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 427         break;
 428     case PRIV_SSCH:
 429         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 430         break;
 431     case PRIV_STCRW:
 432         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 433         break;
 434     case PRIV_STSCH:
 435         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 436         break;
 437     case PRIV_TSCH:
 438         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 439         fprintf(stderr, "Spurious tsch intercept\n");
 440         break;
 441     case PRIV_CHSC:
 442         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 443         break;
 444     case PRIV_TPI:
 445         /* This should have been handled by kvm already. */
 446         fprintf(stderr, "Spurious tpi intercept\n");
 447         break;
 448     case PRIV_SCHM:
 449         no_cc = 1;
 450         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 451                                run->s390_sieic.ipb);
 452         break;
 453     case PRIV_RSCH:
 454         r = ioinst_handle_rsch(env, env->regs[1]);
 455         break;
 456     case PRIV_RCHP:
 457         r = ioinst_handle_rchp(env, env->regs[1]);
 458         break;
 459     case PRIV_STCPS:
 460         /* We do not provide this instruction, it is suppressed. */
 461         no_cc = 1;
 462         r = 0;
 463         break;
 464     case PRIV_SAL:
 465         no_cc = 1;
 466         r = ioinst_handle_sal(env, env->regs[1]);
 467         break;
 468     default:
 469         r = -1;
 470         break;
 471     }
 472
 473     if (r >= 0) {
 474         if (!no_cc) {
 475             setcc(cpu, r);
 476         }
 477         r = 0;
 478     } else if (r < -1) {
 479         r = 0;
 480     }
 481     return r;
 482 }
 483
 484 static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 485 {
 486     int ret = 0;
 487     uint16_t ipa = (ipa0 << 8) | ipa1;
 488
 489     switch (ipa) {
 490     case IPA0_B2 | PRIV_CSCH:
 491     case IPA0_B2 | PRIV_HSCH:
 492     case IPA0_B2 | PRIV_MSCH:
 493     case IPA0_B2 | PRIV_SSCH:
 494     case IPA0_B2 | PRIV_STSCH:
 495     case IPA0_B2 | PRIV_TPI:
 496     case IPA0_B2 | PRIV_SAL:
 497     case IPA0_B2 | PRIV_RSCH:
 498     case IPA0_B2 | PRIV_STCRW:
 499     case IPA0_B2 | PRIV_STCPS:
 500     case IPA0_B2 | PRIV_RCHP:
 501     case IPA0_B2 | PRIV_SCHM:
 502     case IPA0_B2 | PRIV_CHSC:
 503     case IPA0_B2 | PRIV_SIGA:
 504     case IPA0_B2 | PRIV_XSCH:
 505     case IPA0_B9 | PRIV_EQBS:
 506     case IPA0_EB | PRIV_SQBS:
 507         ret = 1;
 508         break;
 509     }
 510
 511     return ret;
 512 }
 513
 514 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 515                        uint8_t ipa0, uint8_t ipa1)
 516 {
 517     int r = 0;
 518     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 519     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 520
 521     dprintf("KVM: PRIV: %d\n", ipa1);
 522     switch (ipa1) {
 523         case PRIV_SCLP_CALL:
 524             r = kvm_sclp_service_call(cpu, run, ipbh0);
 525             break;
 526         default:
 527             if (is_ioinst(ipa0, ipa1, ipb)) {
 528                 r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 529                 if (r == -1) {
 530                     setcc(cpu, 3);
 531                     r = 0;
 532                 }
 533             } else {
 534                 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 535                 r = -1;
 536             }
 537             break;
 538     }
 539
 540     return r;
 541 }
 542
 543 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 544 {
 545     cpu_synchronize_state(env);
 546     env->regs[2] = s390_virtio_hypercall(env);
 547
 548     return 0;
 549 }
 550
 551 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 552 {
 553     int r = 0;
 554
 555     switch (ipb_code) {
 556         case DIAG_KVM_HYPERCALL:
 557             r = handle_hypercall(env, run);
 558             break;
 559         case DIAG_KVM_BREAKPOINT:
 560             sleep(10);
 561             break;
 562         default:
 563             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 564             r = -1;
 565             break;
 566     }
 567
 568     return r;
 569 }
 570
 571 static int s390_cpu_restart(S390CPU *cpu)
 572 {
 573     CPUS390XState *env = &cpu->env;
 574
 575     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 576     s390_add_running_cpu(env);
 577     qemu_cpu_kick(CPU(cpu));
 578     dprintf("DONE: SIGP cpu restart: %p\n", env);
 579     return 0;
 580 }
 581
 582 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 583 {
 584     /* XXX */
 585     fprintf(stderr, "XXX SIGP store status\n");
 586     return -1;
 587 }
 588
 589 static int s390_cpu_initial_reset(S390CPU *cpu)
 590 {
 591     CPUS390XState *env = &cpu->env;
 592     int i;
 593
 594     s390_del_running_cpu(env);
 595     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 596         perror("cannot init reset vcpu");
 597     }
 598
 599     /* Manually zero out all registers */
 600     cpu_synchronize_state(env);
 601     for (i = 0; i < 16; i++) {
 602         env->regs[i] = 0;
 603     }
 604
 605     dprintf("DONE: SIGP initial reset: %p\n", env);
 606     return 0;
 607 }
 608
 609 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 610 {
 611     CPUS390XState *env = &cpu->env;
 612     uint8_t order_code;
 613     uint32_t parameter;
 614     uint16_t cpu_addr;
 615     uint8_t t;
 616     int r = -1;
 617     S390CPU *target_cpu;
 618     CPUS390XState *target_env;
 619
 620     cpu_synchronize_state(env);
 621
 622     /* get order code */
 623     order_code = run->s390_sieic.ipb >> 28;
 624     if (order_code > 0) {
 625         order_code = env->regs[order_code];
 626     }
 627     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 628
 629     /* get parameters */
 630     t = (ipa1 & 0xf0) >> 4;
 631     if (!(t % 2)) {
 632         t++;
 633     }
 634
 635     parameter = env->regs[t] & 0x7ffffe00;
 636     cpu_addr = env->regs[ipa1 & 0x0f];
 637
 638     target_cpu = s390_cpu_addr2state(cpu_addr);
 639     if (target_cpu == NULL) {
 640         goto out;
 641     }
 642     target_env = &target_cpu->env;
 643
 644     switch (order_code) {
 645         case SIGP_RESTART:
 646             r = s390_cpu_restart(target_cpu);
 647             break;
 648         case SIGP_STORE_STATUS_ADDR:
 649             r = s390_store_status(target_env, parameter);
 650             break;
 651         case SIGP_SET_ARCH:
 652             /* make the caller panic */
 653             return -1;
 654         case SIGP_INITIAL_CPU_RESET:
 655             r = s390_cpu_initial_reset(target_cpu);
 656             break;
 657         default:
 658             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 659             break;
 660     }
 661
 662 out:
 663     setcc(cpu, r ? 3 : 0);
 664     return 0;
 665 }
 666
 667 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 668 {
 669     CPUS390XState *env = &cpu->env;
 670     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 671     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 672     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 673     int r = -1;
 674
 675     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 676     switch (ipa0) {
 677     case IPA0_B2:
 678     case IPA0_B9:
 679     case IPA0_EB:
 680         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 681         break;
 682     case IPA0_DIAG:
 683         r = handle_diag(env, run, ipb_code);
 684         break;
 685     case IPA0_SIGP:
 686         r = handle_sigp(cpu, run, ipa1);
 687         break;
 688     }
 689
 690     if (r < 0) {
 691         enter_pgmcheck(cpu, 0x0001);
 692     }
 693     return 0;
 694 }
 695
 696 static bool is_special_wait_psw(CPUState *cs)
 697 {
 698     /* signal quiesce */
 699     return cs->kvm_run->psw_addr == 0xfffUL;
 700 }
 701
 702 static int handle_intercept(S390CPU *cpu)
 703 {
 704     CPUS390XState *env = &cpu->env;
 705     CPUState *cs = CPU(cpu);
 706     struct kvm_run *run = cs->kvm_run;
 707     int icpt_code = run->s390_sieic.icptcode;
 708     int r = 0;
 709
 710     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 711             (long)cs->kvm_run->psw_addr);
 712     switch (icpt_code) {
 713         case ICPT_INSTRUCTION:
 714             r = handle_instruction(cpu, run);
 715             break;
 716         case ICPT_WAITPSW:
 717             if (s390_del_running_cpu(env) == 0 &&
 718                 is_special_wait_psw(cs)) {
 719                 qemu_system_shutdown_request();
 720             }
 721             r = EXCP_HALTED;
 722             break;
 723         case ICPT_CPU_STOP:
 724             if (s390_del_running_cpu(env) == 0) {
 725                 qemu_system_shutdown_request();
 726             }
 727             r = EXCP_HALTED;
 728             break;
 729         case ICPT_SOFT_INTERCEPT:
 730             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 731             exit(1);
 732             break;
 733         case ICPT_IO:
 734             fprintf(stderr, "KVM unimplemented icpt IO\n");
 735             exit(1);
 736             break;
 737         default:
 738             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 739             exit(1);
 740             break;
 741     }
 742
 743     return r;
 744 }
 745
 746 static int handle_tsch(S390CPU *cpu)
 747 {
 748     CPUS390XState *env = &cpu->env;
 749     CPUState *cs = CPU(cpu);
 750     struct kvm_run *run = cs->kvm_run;
 751     int ret;
 752
 753     cpu_synchronize_state(env);
 754     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 755     if (ret >= 0) {
 756         /* Success; set condition code. */
 757         setcc(cpu, ret);
 758         ret = 0;
 759     } else if (ret < -1) {
 760         /*
 761          * Failure.
 762          * If an I/O interrupt had been dequeued, we have to reinject it.
 763          */
 764         if (run->s390_tsch.dequeued) {
 765             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 766             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 767             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 768             uint32_t io_int_word = run->s390_tsch.io_int_word;
 769             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 770                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 771
 772             kvm_s390_interrupt_internal(cpu, type,
 773                                         ((uint32_t)subchannel_id << 16)
 774                                         | subchannel_nr,
 775                                         ((uint64_t)io_int_parm << 32)
 776                                         | io_int_word, 1);
 777         }
 778         ret = 0;
 779     }
 780     return ret;
 781 }
 782
 783 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 784 {
 785     S390CPU *cpu = S390_CPU(cs);
 786     int ret = 0;
 787
 788     switch (run->exit_reason) {
 789         case KVM_EXIT_S390_SIEIC:
 790             ret = handle_intercept(cpu);
 791             break;
 792         case KVM_EXIT_S390_RESET:
 793             qemu_system_reset_request();
 794             break;
 795         case KVM_EXIT_S390_TSCH:
 796             ret = handle_tsch(cpu);
 797             break;
 798         default:
 799             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 800             break;
 801     }
 802
 803     if (ret == 0) {
 804         ret = EXCP_INTERRUPT;
 805     }
 806     return ret;
 807 }
 808
 809 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 810 {
 811     return true;
 812 }
 813
 814 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 815 {
 816     return 1;
 817 }
 818
 819 int kvm_arch_on_sigbus(int code, void *addr)
 820 {
 821     return 1;
 822 }
 823
 824 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 825                            uint16_t subchannel_nr, uint32_t io_int_parm,
 826                            uint32_t io_int_word)
 827 {
 828     uint32_t type;
 829
 830     type = ((subchannel_id & 0xff00) << 24) |
 831         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 832     kvm_s390_interrupt_internal(cpu, type,
 833                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 834                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 835 }
 836
 837 void kvm_s390_crw_mchk(S390CPU *cpu)
 838 {
 839     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 840                                 0x00400f1d40330000, 1);
 841 }
 842
 843 void kvm_s390_enable_css_support(S390CPU *cpu)
 844 {
 845     struct kvm_enable_cap cap = {};
 846     int r;
 847
 848     /* Activate host kernel channel subsystem support. */
 849     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 850     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 851     assert(r == 0);
 852 }