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 #include "qapi/qmp/qjson.h"
  38 #include "monitor/monitor.h"
  39
  40 /* #define DEBUG_KVM */
  41
  42 #ifdef DEBUG_KVM
  43 #define DPRINTF(fmt, ...) \
  44     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  45 #else
  46 #define DPRINTF(fmt, ...) \
  47     do { } while (0)
  48 #endif
  49
  50 #define IPA0_DIAG                       0x8300
  51 #define IPA0_SIGP                       0xae00
  52 #define IPA0_B2                         0xb200
  53 #define IPA0_B9                         0xb900
  54 #define IPA0_EB                         0xeb00
  55
  56 #define PRIV_SCLP_CALL                  0x20
  57 #define PRIV_CSCH                       0x30
  58 #define PRIV_HSCH                       0x31
  59 #define PRIV_MSCH                       0x32
  60 #define PRIV_SSCH                       0x33
  61 #define PRIV_STSCH                      0x34
  62 #define PRIV_TSCH                       0x35
  63 #define PRIV_TPI                        0x36
  64 #define PRIV_SAL                        0x37
  65 #define PRIV_RSCH                       0x38
  66 #define PRIV_STCRW                      0x39
  67 #define PRIV_STCPS                      0x3a
  68 #define PRIV_RCHP                       0x3b
  69 #define PRIV_SCHM                       0x3c
  70 #define PRIV_CHSC                       0x5f
  71 #define PRIV_SIGA                       0x74
  72 #define PRIV_XSCH                       0x76
  73 #define PRIV_SQBS                       0x8a
  74 #define PRIV_EQBS                       0x9c
  75 #define DIAG_IPL                        0x308
  76 #define DIAG_KVM_HYPERCALL              0x500
  77 #define DIAG_KVM_BREAKPOINT             0x501
  78
  79 #define ICPT_INSTRUCTION                0x04
  80 #define ICPT_WAITPSW                    0x1c
  81 #define ICPT_SOFT_INTERCEPT             0x24
  82 #define ICPT_CPU_STOP                   0x28
  83 #define ICPT_IO                         0x40
  84
  85 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  86     KVM_CAP_LAST_INFO
  87 };
  88
  89 static int cap_sync_regs;
  90
  91 static void *legacy_s390_alloc(size_t size);
  92
  93 int kvm_arch_init(KVMState *s)
  94 {
  95     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  96     if (!kvm_check_extension(s, KVM_CAP_S390_GMAP)
  97         || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
  98         phys_mem_set_alloc(legacy_s390_alloc);
  99     }
 100     return 0;
 101 }
 102
 103 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 104 {
 105     return cpu->cpu_index;
 106 }
 107
 108 int kvm_arch_init_vcpu(CPUState *cpu)
 109 {
 110     /* nothing todo yet */
 111     return 0;
 112 }
 113
 114 void kvm_arch_reset_vcpu(CPUState *cpu)
 115 {
 116     /* The initial reset call is needed here to reset in-kernel
 117      * vcpu data that we can't access directly from QEMU
 118      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 119      * Before this ioctl cpu_synchronize_state() is called in common kvm
 120      * code (kvm-all) */
 121     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 122         perror("Can't reset vcpu\n");
 123     }
 124 }
 125
 126 int kvm_arch_put_registers(CPUState *cs, int level)
 127 {
 128     S390CPU *cpu = S390_CPU(cs);
 129     CPUS390XState *env = &cpu->env;
 130     struct kvm_one_reg reg;
 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     if (env->runtime_reg_dirty_mask == KVM_S390_RUNTIME_DIRTY_FULL) {
 156         reg.id = KVM_REG_S390_CPU_TIMER;
 157         reg.addr = (__u64)&(env->cputm);
 158         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 159         if (ret < 0) {
 160             return ret;
 161         }
 162
 163         reg.id = KVM_REG_S390_CLOCK_COMP;
 164         reg.addr = (__u64)&(env->ckc);
 165         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 166         if (ret < 0) {
 167             return ret;
 168         }
 169
 170         reg.id = KVM_REG_S390_TODPR;
 171         reg.addr = (__u64)&(env->todpr);
 172         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 173         if (ret < 0) {
 174             return ret;
 175         }
 176     }
 177     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_NONE;
 178
 179     /* Do we need to save more than that? */
 180     if (level == KVM_PUT_RUNTIME_STATE) {
 181         return 0;
 182     }
 183
 184     if (cap_sync_regs &&
 185         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 186         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 187         for (i = 0; i < 16; i++) {
 188             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 189             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 190         }
 191         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 192         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 193     } else {
 194         for (i = 0; i < 16; i++) {
 195             sregs.acrs[i] = env->aregs[i];
 196             sregs.crs[i] = env->cregs[i];
 197         }
 198         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 199         if (ret < 0) {
 200             return ret;
 201         }
 202     }
 203
 204     /* Finally the prefix */
 205     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 206         cs->kvm_run->s.regs.prefix = env->psa;
 207         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 208     } else {
 209         /* prefix is only supported via sync regs */
 210     }
 211     return 0;
 212 }
 213
 214 int kvm_arch_get_registers(CPUState *cs)
 215 {
 216     S390CPU *cpu = S390_CPU(cs);
 217     CPUS390XState *env = &cpu->env;
 218     struct kvm_one_reg reg;
 219     int r;
 220
 221     r = kvm_s390_get_registers_partial(cs);
 222     if (r < 0) {
 223         return r;
 224     }
 225
 226     reg.id = KVM_REG_S390_CPU_TIMER;
 227     reg.addr = (__u64)&(env->cputm);
 228     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 229     if (r < 0) {
 230         return r;
 231     }
 232
 233     reg.id = KVM_REG_S390_CLOCK_COMP;
 234     reg.addr = (__u64)&(env->ckc);
 235     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 236     if (r < 0) {
 237         return r;
 238     }
 239
 240     reg.id = KVM_REG_S390_TODPR;
 241     reg.addr = (__u64)&(env->todpr);
 242     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 243     if (r < 0) {
 244         return r;
 245     }
 246
 247     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_FULL;
 248     return 0;
 249 }
 250
 251 int kvm_s390_get_registers_partial(CPUState *cs)
 252 {
 253     S390CPU *cpu = S390_CPU(cs);
 254     CPUS390XState *env = &cpu->env;
 255     struct kvm_sregs sregs;
 256     struct kvm_regs regs;
 257     int ret;
 258     int i;
 259
 260     if (env->runtime_reg_dirty_mask) {
 261         return 0;
 262     }
 263
 264     /* get the PSW */
 265     env->psw.addr = cs->kvm_run->psw_addr;
 266     env->psw.mask = cs->kvm_run->psw_mask;
 267
 268     /* the GPRS */
 269     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 270         for (i = 0; i < 16; i++) {
 271             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 272         }
 273     } else {
 274         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 275         if (ret < 0) {
 276             return ret;
 277         }
 278          for (i = 0; i < 16; i++) {
 279             env->regs[i] = regs.gprs[i];
 280         }
 281     }
 282
 283     /* The ACRS and CRS */
 284     if (cap_sync_regs &&
 285         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 286         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 287         for (i = 0; i < 16; i++) {
 288             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 289             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 290         }
 291     } else {
 292         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 293         if (ret < 0) {
 294             return ret;
 295         }
 296          for (i = 0; i < 16; i++) {
 297             env->aregs[i] = sregs.acrs[i];
 298             env->cregs[i] = sregs.crs[i];
 299         }
 300     }
 301
 302     /* Finally the prefix */
 303     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 304         env->psa = cs->kvm_run->s.regs.prefix;
 305     } else {
 306         /* no prefix without sync regs */
 307     }
 308
 309     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_PARTIAL;
 310     return 0;
 311 }
 312
 313 /*
 314  * Legacy layout for s390:
 315  * Older S390 KVM requires the topmost vma of the RAM to be
 316  * smaller than an system defined value, which is at least 256GB.
 317  * Larger systems have larger values. We put the guest between
 318  * the end of data segment (system break) and this value. We
 319  * use 32GB as a base to have enough room for the system break
 320  * to grow. We also have to use MAP parameters that avoid
 321  * read-only mapping of guest pages.
 322  */
 323 static void *legacy_s390_alloc(size_t size)
 324 {
 325     void *mem;
 326
 327     mem = mmap((void *) 0x800000000ULL, size,
 328                PROT_EXEC|PROT_READ|PROT_WRITE,
 329                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 330     return mem == MAP_FAILED ? NULL : mem;
 331 }
 332
 333 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 334 {
 335     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 336
 337     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 338         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 339         return -EINVAL;
 340     }
 341     return 0;
 342 }
 343
 344 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 345 {
 346     uint8_t t[4];
 347     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 348
 349     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 350         return -EINVAL;
 351     } else if (memcmp(t, diag_501, 4)) {
 352         return -EINVAL;
 353     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 354         return -EINVAL;
 355     }
 356
 357     return 0;
 358 }
 359
 360 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 361 {
 362 }
 363
 364 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 365 {
 366 }
 367
 368 int kvm_arch_process_async_events(CPUState *cs)
 369 {
 370     return cs->halted;
 371 }
 372
 373 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 374                                  uint64_t parm64, int vm)
 375 {
 376     CPUState *cs = CPU(cpu);
 377     struct kvm_s390_interrupt kvmint;
 378     int r;
 379
 380     if (!cs->kvm_state) {
 381         return;
 382     }
 383
 384     kvmint.type = type;
 385     kvmint.parm = parm;
 386     kvmint.parm64 = parm64;
 387
 388     if (vm) {
 389         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 390     } else {
 391         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 392     }
 393
 394     if (r < 0) {
 395         fprintf(stderr, "KVM failed to inject interrupt\n");
 396         exit(1);
 397     }
 398 }
 399
 400 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 401 {
 402     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 403                                 token, 1);
 404 }
 405
 406 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 407 {
 408     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 409 }
 410
 411 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 412 {
 413     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 414 }
 415
 416 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 417                                  uint16_t ipbh0)
 418 {
 419     CPUS390XState *env = &cpu->env;
 420     uint32_t sccb;
 421     uint64_t code;
 422     int r = 0;
 423
 424     cpu_synchronize_state(CPU(cpu));
 425     if (env->psw.mask & PSW_MASK_PSTATE) {
 426         enter_pgmcheck(cpu, PGM_PRIVILEGED);
 427         return 0;
 428     }
 429     sccb = env->regs[ipbh0 & 0xf];
 430     code = env->regs[(ipbh0 & 0xf0) >> 4];
 431
 432     r = sclp_service_call(sccb, code);
 433     if (r < 0) {
 434         enter_pgmcheck(cpu, -r);
 435     }
 436     setcc(cpu, r);
 437
 438     return 0;
 439 }
 440
 441 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 442                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 443 {
 444     CPUS390XState *env = &cpu->env;
 445     CPUState *cs = CPU(cpu);
 446
 447     if (ipa0 != 0xb2) {
 448         /* Not handled for now. */
 449         return -1;
 450     }
 451
 452     kvm_s390_get_registers_partial(cs);
 453     cs->kvm_vcpu_dirty = true;
 454
 455     switch (ipa1) {
 456     case PRIV_XSCH:
 457         ioinst_handle_xsch(cpu, env->regs[1]);
 458         break;
 459     case PRIV_CSCH:
 460         ioinst_handle_csch(cpu, env->regs[1]);
 461         break;
 462     case PRIV_HSCH:
 463         ioinst_handle_hsch(cpu, env->regs[1]);
 464         break;
 465     case PRIV_MSCH:
 466         ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb);
 467         break;
 468     case PRIV_SSCH:
 469         ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb);
 470         break;
 471     case PRIV_STCRW:
 472         ioinst_handle_stcrw(cpu, run->s390_sieic.ipb);
 473         break;
 474     case PRIV_STSCH:
 475         ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb);
 476         break;
 477     case PRIV_TSCH:
 478         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 479         fprintf(stderr, "Spurious tsch intercept\n");
 480         break;
 481     case PRIV_CHSC:
 482         ioinst_handle_chsc(cpu, run->s390_sieic.ipb);
 483         break;
 484     case PRIV_TPI:
 485         /* This should have been handled by kvm already. */
 486         fprintf(stderr, "Spurious tpi intercept\n");
 487         break;
 488     case PRIV_SCHM:
 489         ioinst_handle_schm(cpu, env->regs[1], env->regs[2],
 490                            run->s390_sieic.ipb);
 491         break;
 492     case PRIV_RSCH:
 493         ioinst_handle_rsch(cpu, env->regs[1]);
 494         break;
 495     case PRIV_RCHP:
 496         ioinst_handle_rchp(cpu, env->regs[1]);
 497         break;
 498     case PRIV_STCPS:
 499         /* We do not provide this instruction, it is suppressed. */
 500         break;
 501     case PRIV_SAL:
 502         ioinst_handle_sal(cpu, env->regs[1]);
 503         break;
 504     case PRIV_SIGA:
 505         /* Not provided, set CC = 3 for subchannel not operational */
 506         setcc(cpu, 3);
 507         break;
 508     default:
 509         return -1;
 510     }
 511
 512     return 0;
 513 }
 514
 515 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 516                        uint8_t ipa0, uint8_t ipa1)
 517 {
 518     int r = 0;
 519     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 520     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 521
 522     DPRINTF("KVM: PRIV: %d\n", ipa1);
 523     switch (ipa1) {
 524         case PRIV_SCLP_CALL:
 525             r = kvm_sclp_service_call(cpu, run, ipbh0);
 526             break;
 527         default:
 528             r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 529             if (r == -1) {
 530                 DPRINTF("KVM: unhandled PRIV: 0x%x\n", ipa1);
 531             }
 532             break;
 533     }
 534
 535     return r;
 536 }
 537
 538 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 539 {
 540     CPUState *cs = CPU(cpu);
 541     CPUS390XState *env = &cpu->env;
 542
 543     kvm_s390_get_registers_partial(cs);
 544     cs->kvm_vcpu_dirty = true;
 545     env->regs[2] = s390_virtio_hypercall(env);
 546
 547     return 0;
 548 }
 549
 550 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 551 {
 552     uint64_t r1, r3;
 553
 554     cpu_synchronize_state(CPU(cpu));
 555     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 556     r3 = run->s390_sieic.ipa & 0x000f;
 557     handle_diag_308(&cpu->env, r1, r3);
 558 }
 559
 560 #define DIAG_KVM_CODE_MASK 0x000000000000ffff
 561
 562 static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
 563 {
 564     int r = 0;
 565     uint16_t func_code;
 566
 567     /*
 568      * For any diagnose call we support, bits 48-63 of the resulting
 569      * address specify the function code; the remainder is ignored.
 570      */
 571     func_code = decode_basedisp_rs(&cpu->env, ipb) & DIAG_KVM_CODE_MASK;
 572     switch (func_code) {
 573     case DIAG_IPL:
 574         kvm_handle_diag_308(cpu, run);
 575         break;
 576     case DIAG_KVM_HYPERCALL:
 577         r = handle_hypercall(cpu, run);
 578         break;
 579     case DIAG_KVM_BREAKPOINT:
 580         sleep(10);
 581         break;
 582     default:
 583         DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
 584         r = -1;
 585         break;
 586     }
 587
 588     return r;
 589 }
 590
 591 int kvm_s390_cpu_restart(S390CPU *cpu)
 592 {
 593     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 594     s390_add_running_cpu(cpu);
 595     qemu_cpu_kick(CPU(cpu));
 596     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 597     return 0;
 598 }
 599
 600 static int s390_cpu_initial_reset(S390CPU *cpu)
 601 {
 602     CPUState *cs = CPU(cpu);
 603     CPUS390XState *env = &cpu->env;
 604     int i;
 605
 606     s390_del_running_cpu(cpu);
 607     if (kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL) < 0) {
 608         perror("cannot init reset vcpu");
 609     }
 610
 611     /* Manually zero out all registers */
 612     cpu_synchronize_state(cs);
 613     for (i = 0; i < 16; i++) {
 614         env->regs[i] = 0;
 615     }
 616
 617     DPRINTF("DONE: SIGP initial reset: %p\n", env);
 618     return 0;
 619 }
 620
 621 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 622 {
 623     CPUS390XState *env = &cpu->env;
 624     uint8_t order_code;
 625     uint16_t cpu_addr;
 626     int r = -1;
 627     S390CPU *target_cpu;
 628
 629     cpu_synchronize_state(CPU(cpu));
 630
 631     /* get order code */
 632     order_code = run->s390_sieic.ipb >> 28;
 633     if (order_code > 0) {
 634         order_code = env->regs[order_code];
 635     }
 636     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 637
 638     cpu_addr = env->regs[ipa1 & 0x0f];
 639     target_cpu = s390_cpu_addr2state(cpu_addr);
 640     if (target_cpu == NULL) {
 641         goto out;
 642     }
 643
 644     switch (order_code) {
 645         case SIGP_RESTART:
 646             r = kvm_s390_cpu_restart(target_cpu);
 647             break;
 648         case SIGP_SET_ARCH:
 649             /* make the caller panic */
 650             return -1;
 651         case SIGP_INITIAL_CPU_RESET:
 652             r = s390_cpu_initial_reset(target_cpu);
 653             break;
 654         default:
 655             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 656             break;
 657     }
 658
 659 out:
 660     setcc(cpu, r ? 3 : 0);
 661     return 0;
 662 }
 663
 664 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 665 {
 666     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 667     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 668     int r = -1;
 669
 670     DPRINTF("handle_instruction 0x%x 0x%x\n",
 671             run->s390_sieic.ipa, run->s390_sieic.ipb);
 672     switch (ipa0) {
 673     case IPA0_B2:
 674     case IPA0_B9:
 675     case IPA0_EB:
 676         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 677         break;
 678     case IPA0_DIAG:
 679         r = handle_diag(cpu, run, run->s390_sieic.ipb);
 680         break;
 681     case IPA0_SIGP:
 682         r = handle_sigp(cpu, run, ipa1);
 683         break;
 684     }
 685
 686     if (r < 0) {
 687         enter_pgmcheck(cpu, 0x0001);
 688     }
 689 }
 690
 691 static bool is_special_wait_psw(CPUState *cs)
 692 {
 693     /* signal quiesce */
 694     return cs->kvm_run->psw_addr == 0xfffUL;
 695 }
 696
 697 static int handle_intercept(S390CPU *cpu)
 698 {
 699     CPUState *cs = CPU(cpu);
 700     struct kvm_run *run = cs->kvm_run;
 701     int icpt_code = run->s390_sieic.icptcode;
 702     int r = 0;
 703
 704     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 705             (long)cs->kvm_run->psw_addr);
 706     switch (icpt_code) {
 707         case ICPT_INSTRUCTION:
 708             handle_instruction(cpu, run);
 709             break;
 710         case ICPT_WAITPSW:
 711             /* disabled wait, since enabled wait is handled in kernel */
 712             if (s390_del_running_cpu(cpu) == 0) {
 713                 if (is_special_wait_psw(cs)) {
 714                     qemu_system_shutdown_request();
 715                 } else {
 716                     QObject *data;
 717
 718                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 719                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 720                     qobject_decref(data);
 721                     vm_stop(RUN_STATE_GUEST_PANICKED);
 722                 }
 723             }
 724             r = EXCP_HALTED;
 725             break;
 726         case ICPT_CPU_STOP:
 727             if (s390_del_running_cpu(cpu) == 0) {
 728                 qemu_system_shutdown_request();
 729             }
 730             r = EXCP_HALTED;
 731             break;
 732         case ICPT_SOFT_INTERCEPT:
 733             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 734             exit(1);
 735             break;
 736         case ICPT_IO:
 737             fprintf(stderr, "KVM unimplemented icpt IO\n");
 738             exit(1);
 739             break;
 740         default:
 741             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 742             exit(1);
 743             break;
 744     }
 745
 746     return r;
 747 }
 748
 749 static int handle_tsch(S390CPU *cpu)
 750 {
 751     CPUS390XState *env = &cpu->env;
 752     CPUState *cs = CPU(cpu);
 753     struct kvm_run *run = cs->kvm_run;
 754     int ret;
 755
 756     kvm_s390_get_registers_partial(cs);
 757     cs->kvm_vcpu_dirty = true;
 758
 759     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 760     if (ret >= 0) {
 761         /* Success; set condition code. */
 762         setcc(cpu, ret);
 763         ret = 0;
 764     } else if (ret < -1) {
 765         /*
 766          * Failure.
 767          * If an I/O interrupt had been dequeued, we have to reinject it.
 768          */
 769         if (run->s390_tsch.dequeued) {
 770             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 771             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 772             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 773             uint32_t io_int_word = run->s390_tsch.io_int_word;
 774             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 775                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 776
 777             kvm_s390_interrupt_internal(cpu, type,
 778                                         ((uint32_t)subchannel_id << 16)
 779                                         | subchannel_nr,
 780                                         ((uint64_t)io_int_parm << 32)
 781                                         | io_int_word, 1);
 782         }
 783         ret = 0;
 784     }
 785     return ret;
 786 }
 787
 788 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 789 {
 790     S390CPU *cpu = S390_CPU(cs);
 791     int ret = 0;
 792
 793     switch (run->exit_reason) {
 794         case KVM_EXIT_S390_SIEIC:
 795             ret = handle_intercept(cpu);
 796             break;
 797         case KVM_EXIT_S390_RESET:
 798             qemu_system_reset_request();
 799             break;
 800         case KVM_EXIT_S390_TSCH:
 801             ret = handle_tsch(cpu);
 802             break;
 803         default:
 804             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 805             break;
 806     }
 807
 808     if (ret == 0) {
 809         ret = EXCP_INTERRUPT;
 810     }
 811     return ret;
 812 }
 813
 814 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 815 {
 816     return true;
 817 }
 818
 819 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 820 {
 821     return 1;
 822 }
 823
 824 int kvm_arch_on_sigbus(int code, void *addr)
 825 {
 826     return 1;
 827 }
 828
 829 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 830                            uint16_t subchannel_nr, uint32_t io_int_parm,
 831                            uint32_t io_int_word)
 832 {
 833     uint32_t type;
 834
 835     type = ((subchannel_id & 0xff00) << 24) |
 836         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 837     kvm_s390_interrupt_internal(cpu, type,
 838                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 839                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 840 }
 841
 842 void kvm_s390_crw_mchk(S390CPU *cpu)
 843 {
 844     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 845                                 0x00400f1d40330000, 1);
 846 }
 847
 848 void kvm_s390_enable_css_support(S390CPU *cpu)
 849 {
 850     struct kvm_enable_cap cap = {};
 851     int r;
 852
 853     /* Activate host kernel channel subsystem support. */
 854     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 855     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 856     assert(r == 0);
 857 }
 858
 859 void kvm_arch_init_irq_routing(KVMState *s)
 860 {
 861 }
 862
 863 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 864                                     int vq, bool assign)
 865 {
 866     struct kvm_ioeventfd kick = {
 867         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 868         KVM_IOEVENTFD_FLAG_DATAMATCH,
 869         .fd = event_notifier_get_fd(notifier),
 870         .datamatch = vq,
 871         .addr = sch,
 872         .len = 8,
 873     };
 874     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 875         return -ENOSYS;
 876     }
 877     if (!assign) {
 878         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 879     }
 880     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 881 }