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_one_reg reg;
 127     struct kvm_sregs sregs;
 128     struct kvm_regs regs;
 129     int ret;
 130     int i;
 131
 132     /* always save the PSW  and the GPRS*/
 133     cs->kvm_run->psw_addr = env->psw.addr;
 134     cs->kvm_run->psw_mask = env->psw.mask;
 135
 136     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 137         for (i = 0; i < 16; i++) {
 138             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 139             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 140         }
 141     } else {
 142         for (i = 0; i < 16; i++) {
 143             regs.gprs[i] = env->regs[i];
 144         }
 145         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 146         if (ret < 0) {
 147             return ret;
 148         }
 149     }
 150
 151     if (env->runtime_reg_dirty_mask == KVM_S390_RUNTIME_DIRTY_FULL) {
 152         reg.id = KVM_REG_S390_CPU_TIMER;
 153         reg.addr = (__u64)&(env->cputm);
 154         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 155         if (ret < 0) {
 156             return ret;
 157         }
 158
 159         reg.id = KVM_REG_S390_CLOCK_COMP;
 160         reg.addr = (__u64)&(env->ckc);
 161         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 162         if (ret < 0) {
 163             return ret;
 164         }
 165
 166         reg.id = KVM_REG_S390_TODPR;
 167         reg.addr = (__u64)&(env->todpr);
 168         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 169         if (ret < 0) {
 170             return ret;
 171         }
 172     }
 173     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_NONE;
 174
 175     /* Do we need to save more than that? */
 176     if (level == KVM_PUT_RUNTIME_STATE) {
 177         return 0;
 178     }
 179
 180     if (cap_sync_regs &&
 181         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 182         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 183         for (i = 0; i < 16; i++) {
 184             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 185             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 186         }
 187         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 188         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 189     } else {
 190         for (i = 0; i < 16; i++) {
 191             sregs.acrs[i] = env->aregs[i];
 192             sregs.crs[i] = env->cregs[i];
 193         }
 194         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 195         if (ret < 0) {
 196             return ret;
 197         }
 198     }
 199
 200     /* Finally the prefix */
 201     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 202         cs->kvm_run->s.regs.prefix = env->psa;
 203         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 204     } else {
 205         /* prefix is only supported via sync regs */
 206     }
 207     return 0;
 208 }
 209
 210 int kvm_arch_get_registers(CPUState *cs)
 211 {
 212     S390CPU *cpu = S390_CPU(cs);
 213     CPUS390XState *env = &cpu->env;
 214     struct kvm_one_reg reg;
 215     int r;
 216
 217     r = kvm_s390_get_registers_partial(cs);
 218     if (r < 0) {
 219         return r;
 220     }
 221
 222     reg.id = KVM_REG_S390_CPU_TIMER;
 223     reg.addr = (__u64)&(env->cputm);
 224     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 225     if (r < 0) {
 226         return r;
 227     }
 228
 229     reg.id = KVM_REG_S390_CLOCK_COMP;
 230     reg.addr = (__u64)&(env->ckc);
 231     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 232     if (r < 0) {
 233         return r;
 234     }
 235
 236     reg.id = KVM_REG_S390_TODPR;
 237     reg.addr = (__u64)&(env->todpr);
 238     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 239     if (r < 0) {
 240         return r;
 241     }
 242
 243     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_FULL;
 244     return 0;
 245 }
 246
 247 int kvm_s390_get_registers_partial(CPUState *cs)
 248 {
 249     S390CPU *cpu = S390_CPU(cs);
 250     CPUS390XState *env = &cpu->env;
 251     struct kvm_sregs sregs;
 252     struct kvm_regs regs;
 253     int ret;
 254     int i;
 255
 256     if (env->runtime_reg_dirty_mask) {
 257         return 0;
 258     }
 259
 260     /* get the PSW */
 261     env->psw.addr = cs->kvm_run->psw_addr;
 262     env->psw.mask = cs->kvm_run->psw_mask;
 263
 264     /* the GPRS */
 265     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 266         for (i = 0; i < 16; i++) {
 267             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 268         }
 269     } else {
 270         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 271         if (ret < 0) {
 272             return ret;
 273         }
 274          for (i = 0; i < 16; i++) {
 275             env->regs[i] = regs.gprs[i];
 276         }
 277     }
 278
 279     /* The ACRS and CRS */
 280     if (cap_sync_regs &&
 281         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 282         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 283         for (i = 0; i < 16; i++) {
 284             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 285             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 286         }
 287     } else {
 288         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 289         if (ret < 0) {
 290             return ret;
 291         }
 292          for (i = 0; i < 16; i++) {
 293             env->aregs[i] = sregs.acrs[i];
 294             env->cregs[i] = sregs.crs[i];
 295         }
 296     }
 297
 298     /* Finally the prefix */
 299     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 300         env->psa = cs->kvm_run->s.regs.prefix;
 301     } else {
 302         /* no prefix without sync regs */
 303     }
 304
 305     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_PARTIAL;
 306     return 0;
 307 }
 308
 309 /*
 310  * Legacy layout for s390:
 311  * Older S390 KVM requires the topmost vma of the RAM to be
 312  * smaller than an system defined value, which is at least 256GB.
 313  * Larger systems have larger values. We put the guest between
 314  * the end of data segment (system break) and this value. We
 315  * use 32GB as a base to have enough room for the system break
 316  * to grow. We also have to use MAP parameters that avoid
 317  * read-only mapping of guest pages.
 318  */
 319 static void *legacy_s390_alloc(ram_addr_t size)
 320 {
 321     void *mem;
 322
 323     mem = mmap((void *) 0x800000000ULL, size,
 324                PROT_EXEC|PROT_READ|PROT_WRITE,
 325                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 326     if (mem == MAP_FAILED) {
 327         fprintf(stderr, "Allocating RAM failed\n");
 328         abort();
 329     }
 330     return mem;
 331 }
 332
 333 void *kvm_arch_vmalloc(ram_addr_t size)
 334 {
 335     /* Can we use the standard allocation ? */
 336     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 337         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 338         return NULL;
 339     } else {
 340         return legacy_s390_alloc(size);
 341     }
 342 }
 343
 344 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 345 {
 346     S390CPU *cpu = S390_CPU(cs);
 347     CPUS390XState *env = &cpu->env;
 348     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 349
 350     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 351         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 352         return -EINVAL;
 353     }
 354     return 0;
 355 }
 356
 357 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 358 {
 359     S390CPU *cpu = S390_CPU(cs);
 360     CPUS390XState *env = &cpu->env;
 361     uint8_t t[4];
 362     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 363
 364     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 365         return -EINVAL;
 366     } else if (memcmp(t, diag_501, 4)) {
 367         return -EINVAL;
 368     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 369         return -EINVAL;
 370     }
 371
 372     return 0;
 373 }
 374
 375 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 376 {
 377 }
 378
 379 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 380 {
 381 }
 382
 383 int kvm_arch_process_async_events(CPUState *cs)
 384 {
 385     return cs->halted;
 386 }
 387
 388 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 389                                  uint64_t parm64, int vm)
 390 {
 391     CPUState *cs = CPU(cpu);
 392     struct kvm_s390_interrupt kvmint;
 393     int r;
 394
 395     if (!cs->kvm_state) {
 396         return;
 397     }
 398
 399     kvmint.type = type;
 400     kvmint.parm = parm;
 401     kvmint.parm64 = parm64;
 402
 403     if (vm) {
 404         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 405     } else {
 406         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 407     }
 408
 409     if (r < 0) {
 410         fprintf(stderr, "KVM failed to inject interrupt\n");
 411         exit(1);
 412     }
 413 }
 414
 415 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 416 {
 417     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 418                                 token, 1);
 419 }
 420
 421 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 422 {
 423     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 424 }
 425
 426 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 427 {
 428     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 429 }
 430
 431 static inline void setcc(S390CPU *cpu, uint64_t cc)
 432 {
 433     CPUS390XState *env = &cpu->env;
 434     CPUState *cs = CPU(cpu);
 435
 436     cs->kvm_run->psw_mask &= ~(3ull << 44);
 437     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 438
 439     env->psw.mask &= ~(3ul << 44);
 440     env->psw.mask |= (cc & 3) << 44;
 441 }
 442
 443 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 444                                  uint16_t ipbh0)
 445 {
 446     CPUS390XState *env = &cpu->env;
 447     uint32_t sccb;
 448     uint64_t code;
 449     int r = 0;
 450
 451     cpu_synchronize_state(env);
 452     sccb = env->regs[ipbh0 & 0xf];
 453     code = env->regs[(ipbh0 & 0xf0) >> 4];
 454
 455     r = sclp_service_call(sccb, code);
 456     if (r < 0) {
 457         enter_pgmcheck(cpu, -r);
 458     }
 459     setcc(cpu, r);
 460
 461     return 0;
 462 }
 463
 464 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 465                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 466 {
 467     int r = 0;
 468     int no_cc = 0;
 469     CPUS390XState *env = &cpu->env;
 470
 471     if (ipa0 != 0xb2) {
 472         /* Not handled for now. */
 473         return -1;
 474     }
 475     cpu_synchronize_state(env);
 476     switch (ipa1) {
 477     case PRIV_XSCH:
 478         r = ioinst_handle_xsch(env, env->regs[1]);
 479         break;
 480     case PRIV_CSCH:
 481         r = ioinst_handle_csch(env, env->regs[1]);
 482         break;
 483     case PRIV_HSCH:
 484         r = ioinst_handle_hsch(env, env->regs[1]);
 485         break;
 486     case PRIV_MSCH:
 487         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 488         break;
 489     case PRIV_SSCH:
 490         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 491         break;
 492     case PRIV_STCRW:
 493         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 494         break;
 495     case PRIV_STSCH:
 496         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 497         break;
 498     case PRIV_TSCH:
 499         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 500         fprintf(stderr, "Spurious tsch intercept\n");
 501         break;
 502     case PRIV_CHSC:
 503         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 504         break;
 505     case PRIV_TPI:
 506         /* This should have been handled by kvm already. */
 507         fprintf(stderr, "Spurious tpi intercept\n");
 508         break;
 509     case PRIV_SCHM:
 510         no_cc = 1;
 511         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 512                                run->s390_sieic.ipb);
 513         break;
 514     case PRIV_RSCH:
 515         r = ioinst_handle_rsch(env, env->regs[1]);
 516         break;
 517     case PRIV_RCHP:
 518         r = ioinst_handle_rchp(env, env->regs[1]);
 519         break;
 520     case PRIV_STCPS:
 521         /* We do not provide this instruction, it is suppressed. */
 522         no_cc = 1;
 523         r = 0;
 524         break;
 525     case PRIV_SAL:
 526         no_cc = 1;
 527         r = ioinst_handle_sal(env, env->regs[1]);
 528         break;
 529     default:
 530         r = -1;
 531         break;
 532     }
 533
 534     if (r >= 0) {
 535         if (!no_cc) {
 536             setcc(cpu, r);
 537         }
 538         r = 0;
 539     } else if (r < -1) {
 540         r = 0;
 541     }
 542     return r;
 543 }
 544
 545 static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 546 {
 547     int ret = 0;
 548     uint16_t ipa = (ipa0 << 8) | ipa1;
 549
 550     switch (ipa) {
 551     case IPA0_B2 | PRIV_CSCH:
 552     case IPA0_B2 | PRIV_HSCH:
 553     case IPA0_B2 | PRIV_MSCH:
 554     case IPA0_B2 | PRIV_SSCH:
 555     case IPA0_B2 | PRIV_STSCH:
 556     case IPA0_B2 | PRIV_TPI:
 557     case IPA0_B2 | PRIV_SAL:
 558     case IPA0_B2 | PRIV_RSCH:
 559     case IPA0_B2 | PRIV_STCRW:
 560     case IPA0_B2 | PRIV_STCPS:
 561     case IPA0_B2 | PRIV_RCHP:
 562     case IPA0_B2 | PRIV_SCHM:
 563     case IPA0_B2 | PRIV_CHSC:
 564     case IPA0_B2 | PRIV_SIGA:
 565     case IPA0_B2 | PRIV_XSCH:
 566     case IPA0_B9 | PRIV_EQBS:
 567     case IPA0_EB | PRIV_SQBS:
 568         ret = 1;
 569         break;
 570     }
 571
 572     return ret;
 573 }
 574
 575 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 576                        uint8_t ipa0, uint8_t ipa1)
 577 {
 578     int r = 0;
 579     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 580     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 581
 582     dprintf("KVM: PRIV: %d\n", ipa1);
 583     switch (ipa1) {
 584         case PRIV_SCLP_CALL:
 585             r = kvm_sclp_service_call(cpu, run, ipbh0);
 586             break;
 587         default:
 588             if (is_ioinst(ipa0, ipa1, ipb)) {
 589                 r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 590                 if (r == -1) {
 591                     setcc(cpu, 3);
 592                     r = 0;
 593                 }
 594             } else {
 595                 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 596                 r = -1;
 597             }
 598             break;
 599     }
 600
 601     return r;
 602 }
 603
 604 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 605 {
 606     cpu_synchronize_state(env);
 607     env->regs[2] = s390_virtio_hypercall(env);
 608
 609     return 0;
 610 }
 611
 612 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 613 {
 614     int r = 0;
 615
 616     switch (ipb_code) {
 617         case DIAG_KVM_HYPERCALL:
 618             r = handle_hypercall(env, run);
 619             break;
 620         case DIAG_KVM_BREAKPOINT:
 621             sleep(10);
 622             break;
 623         default:
 624             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 625             r = -1;
 626             break;
 627     }
 628
 629     return r;
 630 }
 631
 632 static int s390_cpu_restart(S390CPU *cpu)
 633 {
 634     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 635     s390_add_running_cpu(cpu);
 636     qemu_cpu_kick(CPU(cpu));
 637     dprintf("DONE: SIGP cpu restart: %p\n", &cpu->env);
 638     return 0;
 639 }
 640
 641 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 642 {
 643     /* XXX */
 644     fprintf(stderr, "XXX SIGP store status\n");
 645     return -1;
 646 }
 647
 648 static int s390_cpu_initial_reset(S390CPU *cpu)
 649 {
 650     CPUS390XState *env = &cpu->env;
 651     int i;
 652
 653     s390_del_running_cpu(cpu);
 654     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 655         perror("cannot init reset vcpu");
 656     }
 657
 658     /* Manually zero out all registers */
 659     cpu_synchronize_state(env);
 660     for (i = 0; i < 16; i++) {
 661         env->regs[i] = 0;
 662     }
 663
 664     dprintf("DONE: SIGP initial reset: %p\n", env);
 665     return 0;
 666 }
 667
 668 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 669 {
 670     CPUS390XState *env = &cpu->env;
 671     uint8_t order_code;
 672     uint32_t parameter;
 673     uint16_t cpu_addr;
 674     uint8_t t;
 675     int r = -1;
 676     S390CPU *target_cpu;
 677     CPUS390XState *target_env;
 678
 679     cpu_synchronize_state(env);
 680
 681     /* get order code */
 682     order_code = run->s390_sieic.ipb >> 28;
 683     if (order_code > 0) {
 684         order_code = env->regs[order_code];
 685     }
 686     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 687
 688     /* get parameters */
 689     t = (ipa1 & 0xf0) >> 4;
 690     if (!(t % 2)) {
 691         t++;
 692     }
 693
 694     parameter = env->regs[t] & 0x7ffffe00;
 695     cpu_addr = env->regs[ipa1 & 0x0f];
 696
 697     target_cpu = s390_cpu_addr2state(cpu_addr);
 698     if (target_cpu == NULL) {
 699         goto out;
 700     }
 701     target_env = &target_cpu->env;
 702
 703     switch (order_code) {
 704         case SIGP_RESTART:
 705             r = s390_cpu_restart(target_cpu);
 706             break;
 707         case SIGP_STORE_STATUS_ADDR:
 708             r = s390_store_status(target_env, parameter);
 709             break;
 710         case SIGP_SET_ARCH:
 711             /* make the caller panic */
 712             return -1;
 713         case SIGP_INITIAL_CPU_RESET:
 714             r = s390_cpu_initial_reset(target_cpu);
 715             break;
 716         default:
 717             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 718             break;
 719     }
 720
 721 out:
 722     setcc(cpu, r ? 3 : 0);
 723     return 0;
 724 }
 725
 726 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 727 {
 728     CPUS390XState *env = &cpu->env;
 729     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 730     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 731     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 732     int r = -1;
 733
 734     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 735     switch (ipa0) {
 736     case IPA0_B2:
 737     case IPA0_B9:
 738     case IPA0_EB:
 739         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 740         break;
 741     case IPA0_DIAG:
 742         r = handle_diag(env, run, ipb_code);
 743         break;
 744     case IPA0_SIGP:
 745         r = handle_sigp(cpu, run, ipa1);
 746         break;
 747     }
 748
 749     if (r < 0) {
 750         enter_pgmcheck(cpu, 0x0001);
 751     }
 752     return 0;
 753 }
 754
 755 static bool is_special_wait_psw(CPUState *cs)
 756 {
 757     /* signal quiesce */
 758     return cs->kvm_run->psw_addr == 0xfffUL;
 759 }
 760
 761 static int handle_intercept(S390CPU *cpu)
 762 {
 763     CPUState *cs = CPU(cpu);
 764     struct kvm_run *run = cs->kvm_run;
 765     int icpt_code = run->s390_sieic.icptcode;
 766     int r = 0;
 767
 768     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 769             (long)cs->kvm_run->psw_addr);
 770     switch (icpt_code) {
 771         case ICPT_INSTRUCTION:
 772             r = handle_instruction(cpu, run);
 773             break;
 774         case ICPT_WAITPSW:
 775             if (s390_del_running_cpu(cpu) == 0 &&
 776                 is_special_wait_psw(cs)) {
 777                 qemu_system_shutdown_request();
 778             }
 779             r = EXCP_HALTED;
 780             break;
 781         case ICPT_CPU_STOP:
 782             if (s390_del_running_cpu(cpu) == 0) {
 783                 qemu_system_shutdown_request();
 784             }
 785             r = EXCP_HALTED;
 786             break;
 787         case ICPT_SOFT_INTERCEPT:
 788             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 789             exit(1);
 790             break;
 791         case ICPT_IO:
 792             fprintf(stderr, "KVM unimplemented icpt IO\n");
 793             exit(1);
 794             break;
 795         default:
 796             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 797             exit(1);
 798             break;
 799     }
 800
 801     return r;
 802 }
 803
 804 static int handle_tsch(S390CPU *cpu)
 805 {
 806     CPUS390XState *env = &cpu->env;
 807     CPUState *cs = CPU(cpu);
 808     struct kvm_run *run = cs->kvm_run;
 809     int ret;
 810
 811     cpu_synchronize_state(env);
 812     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 813     if (ret >= 0) {
 814         /* Success; set condition code. */
 815         setcc(cpu, ret);
 816         ret = 0;
 817     } else if (ret < -1) {
 818         /*
 819          * Failure.
 820          * If an I/O interrupt had been dequeued, we have to reinject it.
 821          */
 822         if (run->s390_tsch.dequeued) {
 823             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 824             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 825             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 826             uint32_t io_int_word = run->s390_tsch.io_int_word;
 827             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 828                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 829
 830             kvm_s390_interrupt_internal(cpu, type,
 831                                         ((uint32_t)subchannel_id << 16)
 832                                         | subchannel_nr,
 833                                         ((uint64_t)io_int_parm << 32)
 834                                         | io_int_word, 1);
 835         }
 836         ret = 0;
 837     }
 838     return ret;
 839 }
 840
 841 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 842 {
 843     S390CPU *cpu = S390_CPU(cs);
 844     int ret = 0;
 845
 846     switch (run->exit_reason) {
 847         case KVM_EXIT_S390_SIEIC:
 848             ret = handle_intercept(cpu);
 849             break;
 850         case KVM_EXIT_S390_RESET:
 851             qemu_system_reset_request();
 852             break;
 853         case KVM_EXIT_S390_TSCH:
 854             ret = handle_tsch(cpu);
 855             break;
 856         default:
 857             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 858             break;
 859     }
 860
 861     if (ret == 0) {
 862         ret = EXCP_INTERRUPT;
 863     }
 864     return ret;
 865 }
 866
 867 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 868 {
 869     return true;
 870 }
 871
 872 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 873 {
 874     return 1;
 875 }
 876
 877 int kvm_arch_on_sigbus(int code, void *addr)
 878 {
 879     return 1;
 880 }
 881
 882 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 883                            uint16_t subchannel_nr, uint32_t io_int_parm,
 884                            uint32_t io_int_word)
 885 {
 886     uint32_t type;
 887
 888     type = ((subchannel_id & 0xff00) << 24) |
 889         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 890     kvm_s390_interrupt_internal(cpu, type,
 891                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 892                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 893 }
 894
 895 void kvm_s390_crw_mchk(S390CPU *cpu)
 896 {
 897     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 898                                 0x00400f1d40330000, 1);
 899 }
 900
 901 void kvm_s390_enable_css_support(S390CPU *cpu)
 902 {
 903     struct kvm_enable_cap cap = {};
 904     int r;
 905
 906     /* Activate host kernel channel subsystem support. */
 907     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 908     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 909     assert(r == 0);
 910 }