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 #define SIGP_RESTART                    0x06
  86 #define SIGP_INITIAL_CPU_RESET          0x0b
  87 #define SIGP_STORE_STATUS_ADDR          0x0e
  88 #define SIGP_SET_ARCH                   0x12
  89
  90 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  91     KVM_CAP_LAST_INFO
  92 };
  93
  94 static int cap_sync_regs;
  95
  96 static void *legacy_s390_alloc(ram_addr_t size);
  97
  98 int kvm_arch_init(KVMState *s)
  99 {
 100     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
 101     if (!kvm_check_extension(s, KVM_CAP_S390_GMAP)
 102         || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
 103         phys_mem_set_alloc(legacy_s390_alloc);
 104     }
 105     return 0;
 106 }
 107
 108 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 109 {
 110     return cpu->cpu_index;
 111 }
 112
 113 int kvm_arch_init_vcpu(CPUState *cpu)
 114 {
 115     /* nothing todo yet */
 116     return 0;
 117 }
 118
 119 void kvm_arch_reset_vcpu(CPUState *cpu)
 120 {
 121     /* The initial reset call is needed here to reset in-kernel
 122      * vcpu data that we can't access directly from QEMU
 123      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 124      * Before this ioctl cpu_synchronize_state() is called in common kvm
 125      * code (kvm-all) */
 126     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 127         perror("Can't reset vcpu\n");
 128     }
 129 }
 130
 131 int kvm_arch_put_registers(CPUState *cs, int level)
 132 {
 133     S390CPU *cpu = S390_CPU(cs);
 134     CPUS390XState *env = &cpu->env;
 135     struct kvm_one_reg reg;
 136     struct kvm_sregs sregs;
 137     struct kvm_regs regs;
 138     int ret;
 139     int i;
 140
 141     /* always save the PSW  and the GPRS*/
 142     cs->kvm_run->psw_addr = env->psw.addr;
 143     cs->kvm_run->psw_mask = env->psw.mask;
 144
 145     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 146         for (i = 0; i < 16; i++) {
 147             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 148             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 149         }
 150     } else {
 151         for (i = 0; i < 16; i++) {
 152             regs.gprs[i] = env->regs[i];
 153         }
 154         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 155         if (ret < 0) {
 156             return ret;
 157         }
 158     }
 159
 160     if (env->runtime_reg_dirty_mask == KVM_S390_RUNTIME_DIRTY_FULL) {
 161         reg.id = KVM_REG_S390_CPU_TIMER;
 162         reg.addr = (__u64)&(env->cputm);
 163         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 164         if (ret < 0) {
 165             return ret;
 166         }
 167
 168         reg.id = KVM_REG_S390_CLOCK_COMP;
 169         reg.addr = (__u64)&(env->ckc);
 170         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 171         if (ret < 0) {
 172             return ret;
 173         }
 174
 175         reg.id = KVM_REG_S390_TODPR;
 176         reg.addr = (__u64)&(env->todpr);
 177         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 178         if (ret < 0) {
 179             return ret;
 180         }
 181     }
 182     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_NONE;
 183
 184     /* Do we need to save more than that? */
 185     if (level == KVM_PUT_RUNTIME_STATE) {
 186         return 0;
 187     }
 188
 189     if (cap_sync_regs &&
 190         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 191         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 192         for (i = 0; i < 16; i++) {
 193             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 194             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 195         }
 196         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 197         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 198     } else {
 199         for (i = 0; i < 16; i++) {
 200             sregs.acrs[i] = env->aregs[i];
 201             sregs.crs[i] = env->cregs[i];
 202         }
 203         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 204         if (ret < 0) {
 205             return ret;
 206         }
 207     }
 208
 209     /* Finally the prefix */
 210     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 211         cs->kvm_run->s.regs.prefix = env->psa;
 212         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 213     } else {
 214         /* prefix is only supported via sync regs */
 215     }
 216     return 0;
 217 }
 218
 219 int kvm_arch_get_registers(CPUState *cs)
 220 {
 221     S390CPU *cpu = S390_CPU(cs);
 222     CPUS390XState *env = &cpu->env;
 223     struct kvm_one_reg reg;
 224     int r;
 225
 226     r = kvm_s390_get_registers_partial(cs);
 227     if (r < 0) {
 228         return r;
 229     }
 230
 231     reg.id = KVM_REG_S390_CPU_TIMER;
 232     reg.addr = (__u64)&(env->cputm);
 233     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 234     if (r < 0) {
 235         return r;
 236     }
 237
 238     reg.id = KVM_REG_S390_CLOCK_COMP;
 239     reg.addr = (__u64)&(env->ckc);
 240     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 241     if (r < 0) {
 242         return r;
 243     }
 244
 245     reg.id = KVM_REG_S390_TODPR;
 246     reg.addr = (__u64)&(env->todpr);
 247     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 248     if (r < 0) {
 249         return r;
 250     }
 251
 252     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_FULL;
 253     return 0;
 254 }
 255
 256 int kvm_s390_get_registers_partial(CPUState *cs)
 257 {
 258     S390CPU *cpu = S390_CPU(cs);
 259     CPUS390XState *env = &cpu->env;
 260     struct kvm_sregs sregs;
 261     struct kvm_regs regs;
 262     int ret;
 263     int i;
 264
 265     if (env->runtime_reg_dirty_mask) {
 266         return 0;
 267     }
 268
 269     /* get the PSW */
 270     env->psw.addr = cs->kvm_run->psw_addr;
 271     env->psw.mask = cs->kvm_run->psw_mask;
 272
 273     /* the GPRS */
 274     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 275         for (i = 0; i < 16; i++) {
 276             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 277         }
 278     } else {
 279         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 280         if (ret < 0) {
 281             return ret;
 282         }
 283          for (i = 0; i < 16; i++) {
 284             env->regs[i] = regs.gprs[i];
 285         }
 286     }
 287
 288     /* The ACRS and CRS */
 289     if (cap_sync_regs &&
 290         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 291         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 292         for (i = 0; i < 16; i++) {
 293             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 294             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 295         }
 296     } else {
 297         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 298         if (ret < 0) {
 299             return ret;
 300         }
 301          for (i = 0; i < 16; i++) {
 302             env->aregs[i] = sregs.acrs[i];
 303             env->cregs[i] = sregs.crs[i];
 304         }
 305     }
 306
 307     /* Finally the prefix */
 308     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 309         env->psa = cs->kvm_run->s.regs.prefix;
 310     } else {
 311         /* no prefix without sync regs */
 312     }
 313
 314     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_PARTIAL;
 315     return 0;
 316 }
 317
 318 /*
 319  * Legacy layout for s390:
 320  * Older S390 KVM requires the topmost vma of the RAM to be
 321  * smaller than an system defined value, which is at least 256GB.
 322  * Larger systems have larger values. We put the guest between
 323  * the end of data segment (system break) and this value. We
 324  * use 32GB as a base to have enough room for the system break
 325  * to grow. We also have to use MAP parameters that avoid
 326  * read-only mapping of guest pages.
 327  */
 328 static void *legacy_s390_alloc(ram_addr_t size)
 329 {
 330     void *mem;
 331
 332     mem = mmap((void *) 0x800000000ULL, size,
 333                PROT_EXEC|PROT_READ|PROT_WRITE,
 334                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 335     return mem == MAP_FAILED ? NULL : mem;
 336 }
 337
 338 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 339 {
 340     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 341
 342     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 343         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 344         return -EINVAL;
 345     }
 346     return 0;
 347 }
 348
 349 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 350 {
 351     uint8_t t[4];
 352     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 353
 354     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 355         return -EINVAL;
 356     } else if (memcmp(t, diag_501, 4)) {
 357         return -EINVAL;
 358     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 359         return -EINVAL;
 360     }
 361
 362     return 0;
 363 }
 364
 365 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 366 {
 367 }
 368
 369 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 370 {
 371 }
 372
 373 int kvm_arch_process_async_events(CPUState *cs)
 374 {
 375     return cs->halted;
 376 }
 377
 378 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 379                                  uint64_t parm64, int vm)
 380 {
 381     CPUState *cs = CPU(cpu);
 382     struct kvm_s390_interrupt kvmint;
 383     int r;
 384
 385     if (!cs->kvm_state) {
 386         return;
 387     }
 388
 389     kvmint.type = type;
 390     kvmint.parm = parm;
 391     kvmint.parm64 = parm64;
 392
 393     if (vm) {
 394         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 395     } else {
 396         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 397     }
 398
 399     if (r < 0) {
 400         fprintf(stderr, "KVM failed to inject interrupt\n");
 401         exit(1);
 402     }
 403 }
 404
 405 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 406 {
 407     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 408                                 token, 1);
 409 }
 410
 411 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 412 {
 413     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 414 }
 415
 416 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 417 {
 418     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 419 }
 420
 421 static inline void setcc(S390CPU *cpu, uint64_t cc)
 422 {
 423     CPUS390XState *env = &cpu->env;
 424     CPUState *cs = CPU(cpu);
 425
 426     cs->kvm_run->psw_mask &= ~(3ull << 44);
 427     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 428
 429     env->psw.mask &= ~(3ul << 44);
 430     env->psw.mask |= (cc & 3) << 44;
 431 }
 432
 433 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 434                                  uint16_t ipbh0)
 435 {
 436     CPUS390XState *env = &cpu->env;
 437     uint32_t sccb;
 438     uint64_t code;
 439     int r = 0;
 440
 441     cpu_synchronize_state(CPU(cpu));
 442     sccb = env->regs[ipbh0 & 0xf];
 443     code = env->regs[(ipbh0 & 0xf0) >> 4];
 444
 445     r = sclp_service_call(sccb, code);
 446     if (r < 0) {
 447         enter_pgmcheck(cpu, -r);
 448     }
 449     setcc(cpu, r);
 450
 451     return 0;
 452 }
 453
 454 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 455                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 456 {
 457     int r = 0;
 458     int no_cc = 0;
 459     CPUS390XState *env = &cpu->env;
 460     CPUState *cs = CPU(cpu);
 461
 462     if (ipa0 != 0xb2) {
 463         /* Not handled for now. */
 464         return -1;
 465     }
 466
 467     kvm_s390_get_registers_partial(cs);
 468     cs->kvm_vcpu_dirty = true;
 469
 470     switch (ipa1) {
 471     case PRIV_XSCH:
 472         r = ioinst_handle_xsch(env, env->regs[1]);
 473         break;
 474     case PRIV_CSCH:
 475         r = ioinst_handle_csch(env, env->regs[1]);
 476         break;
 477     case PRIV_HSCH:
 478         r = ioinst_handle_hsch(env, env->regs[1]);
 479         break;
 480     case PRIV_MSCH:
 481         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 482         break;
 483     case PRIV_SSCH:
 484         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 485         break;
 486     case PRIV_STCRW:
 487         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 488         break;
 489     case PRIV_STSCH:
 490         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 491         break;
 492     case PRIV_TSCH:
 493         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 494         fprintf(stderr, "Spurious tsch intercept\n");
 495         break;
 496     case PRIV_CHSC:
 497         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 498         break;
 499     case PRIV_TPI:
 500         /* This should have been handled by kvm already. */
 501         fprintf(stderr, "Spurious tpi intercept\n");
 502         break;
 503     case PRIV_SCHM:
 504         no_cc = 1;
 505         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 506                                run->s390_sieic.ipb);
 507         break;
 508     case PRIV_RSCH:
 509         r = ioinst_handle_rsch(env, env->regs[1]);
 510         break;
 511     case PRIV_RCHP:
 512         r = ioinst_handle_rchp(env, env->regs[1]);
 513         break;
 514     case PRIV_STCPS:
 515         /* We do not provide this instruction, it is suppressed. */
 516         no_cc = 1;
 517         r = 0;
 518         break;
 519     case PRIV_SAL:
 520         no_cc = 1;
 521         r = ioinst_handle_sal(env, env->regs[1]);
 522         break;
 523     case PRIV_SIGA:
 524         /* Not provided, set CC = 3 for subchannel not operational */
 525         r = 3;
 526         break;
 527     default:
 528         return -1;
 529     }
 530
 531     if (r >= 0 && !no_cc) {
 532         setcc(cpu, r);
 533     }
 534
 535     return 0;
 536 }
 537
 538 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 539                        uint8_t ipa0, uint8_t ipa1)
 540 {
 541     int r = 0;
 542     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 543     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 544
 545     DPRINTF("KVM: PRIV: %d\n", ipa1);
 546     switch (ipa1) {
 547         case PRIV_SCLP_CALL:
 548             r = kvm_sclp_service_call(cpu, run, ipbh0);
 549             break;
 550         default:
 551             r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 552             if (r == -1) {
 553                 DPRINTF("KVM: unhandled PRIV: 0x%x\n", ipa1);
 554             }
 555             break;
 556     }
 557
 558     return r;
 559 }
 560
 561 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 562 {
 563     CPUState *cs = CPU(cpu);
 564     CPUS390XState *env = &cpu->env;
 565
 566     kvm_s390_get_registers_partial(cs);
 567     cs->kvm_vcpu_dirty = true;
 568     env->regs[2] = s390_virtio_hypercall(env);
 569
 570     return 0;
 571 }
 572
 573 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 574 {
 575     uint64_t r1, r3;
 576
 577     cpu_synchronize_state(CPU(cpu));
 578     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 579     r3 = run->s390_sieic.ipa & 0x000f;
 580     handle_diag_308(&cpu->env, r1, r3);
 581 }
 582
 583 static int handle_diag(S390CPU *cpu, struct kvm_run *run, int ipb_code)
 584 {
 585     int r = 0;
 586
 587     switch (ipb_code) {
 588     case DIAG_IPL:
 589         kvm_handle_diag_308(cpu, run);
 590         break;
 591     case DIAG_KVM_HYPERCALL:
 592         r = handle_hypercall(cpu, run);
 593         break;
 594     case DIAG_KVM_BREAKPOINT:
 595         sleep(10);
 596         break;
 597     default:
 598         DPRINTF("KVM: unknown DIAG: 0x%x\n", ipb_code);
 599         r = -1;
 600         break;
 601     }
 602
 603     return r;
 604 }
 605
 606 int kvm_s390_cpu_restart(S390CPU *cpu)
 607 {
 608     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 609     s390_add_running_cpu(cpu);
 610     qemu_cpu_kick(CPU(cpu));
 611     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 612     return 0;
 613 }
 614
 615 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 616 {
 617     /* XXX */
 618     fprintf(stderr, "XXX SIGP store status\n");
 619     return -1;
 620 }
 621
 622 static int s390_cpu_initial_reset(S390CPU *cpu)
 623 {
 624     CPUState *cs = CPU(cpu);
 625     CPUS390XState *env = &cpu->env;
 626     int i;
 627
 628     s390_del_running_cpu(cpu);
 629     if (kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL) < 0) {
 630         perror("cannot init reset vcpu");
 631     }
 632
 633     /* Manually zero out all registers */
 634     cpu_synchronize_state(cs);
 635     for (i = 0; i < 16; i++) {
 636         env->regs[i] = 0;
 637     }
 638
 639     DPRINTF("DONE: SIGP initial reset: %p\n", env);
 640     return 0;
 641 }
 642
 643 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 644 {
 645     CPUS390XState *env = &cpu->env;
 646     uint8_t order_code;
 647     uint32_t parameter;
 648     uint16_t cpu_addr;
 649     uint8_t t;
 650     int r = -1;
 651     S390CPU *target_cpu;
 652     CPUS390XState *target_env;
 653
 654     cpu_synchronize_state(CPU(cpu));
 655
 656     /* get order code */
 657     order_code = run->s390_sieic.ipb >> 28;
 658     if (order_code > 0) {
 659         order_code = env->regs[order_code];
 660     }
 661     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 662
 663     /* get parameters */
 664     t = (ipa1 & 0xf0) >> 4;
 665     if (!(t % 2)) {
 666         t++;
 667     }
 668
 669     parameter = env->regs[t] & 0x7ffffe00;
 670     cpu_addr = env->regs[ipa1 & 0x0f];
 671
 672     target_cpu = s390_cpu_addr2state(cpu_addr);
 673     if (target_cpu == NULL) {
 674         goto out;
 675     }
 676     target_env = &target_cpu->env;
 677
 678     switch (order_code) {
 679         case SIGP_RESTART:
 680             r = kvm_s390_cpu_restart(target_cpu);
 681             break;
 682         case SIGP_STORE_STATUS_ADDR:
 683             r = s390_store_status(target_env, parameter);
 684             break;
 685         case SIGP_SET_ARCH:
 686             /* make the caller panic */
 687             return -1;
 688         case SIGP_INITIAL_CPU_RESET:
 689             r = s390_cpu_initial_reset(target_cpu);
 690             break;
 691         default:
 692             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 693             break;
 694     }
 695
 696 out:
 697     setcc(cpu, r ? 3 : 0);
 698     return 0;
 699 }
 700
 701 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 702 {
 703     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 704     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 705     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 706     int r = -1;
 707
 708     DPRINTF("handle_instruction 0x%x 0x%x\n",
 709             run->s390_sieic.ipa, run->s390_sieic.ipb);
 710     switch (ipa0) {
 711     case IPA0_B2:
 712     case IPA0_B9:
 713     case IPA0_EB:
 714         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 715         break;
 716     case IPA0_DIAG:
 717         r = handle_diag(cpu, run, ipb_code);
 718         break;
 719     case IPA0_SIGP:
 720         r = handle_sigp(cpu, run, ipa1);
 721         break;
 722     }
 723
 724     if (r < 0) {
 725         enter_pgmcheck(cpu, 0x0001);
 726     }
 727 }
 728
 729 static bool is_special_wait_psw(CPUState *cs)
 730 {
 731     /* signal quiesce */
 732     return cs->kvm_run->psw_addr == 0xfffUL;
 733 }
 734
 735 static int handle_intercept(S390CPU *cpu)
 736 {
 737     CPUState *cs = CPU(cpu);
 738     struct kvm_run *run = cs->kvm_run;
 739     int icpt_code = run->s390_sieic.icptcode;
 740     int r = 0;
 741
 742     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 743             (long)cs->kvm_run->psw_addr);
 744     switch (icpt_code) {
 745         case ICPT_INSTRUCTION:
 746             handle_instruction(cpu, run);
 747             break;
 748         case ICPT_WAITPSW:
 749             /* disabled wait, since enabled wait is handled in kernel */
 750             if (s390_del_running_cpu(cpu) == 0) {
 751                 if (is_special_wait_psw(cs)) {
 752                     qemu_system_shutdown_request();
 753                 } else {
 754                     QObject *data;
 755
 756                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 757                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 758                     qobject_decref(data);
 759                     vm_stop(RUN_STATE_GUEST_PANICKED);
 760                 }
 761             }
 762             r = EXCP_HALTED;
 763             break;
 764         case ICPT_CPU_STOP:
 765             if (s390_del_running_cpu(cpu) == 0) {
 766                 qemu_system_shutdown_request();
 767             }
 768             r = EXCP_HALTED;
 769             break;
 770         case ICPT_SOFT_INTERCEPT:
 771             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 772             exit(1);
 773             break;
 774         case ICPT_IO:
 775             fprintf(stderr, "KVM unimplemented icpt IO\n");
 776             exit(1);
 777             break;
 778         default:
 779             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 780             exit(1);
 781             break;
 782     }
 783
 784     return r;
 785 }
 786
 787 static int handle_tsch(S390CPU *cpu)
 788 {
 789     CPUS390XState *env = &cpu->env;
 790     CPUState *cs = CPU(cpu);
 791     struct kvm_run *run = cs->kvm_run;
 792     int ret;
 793
 794     kvm_s390_get_registers_partial(cs);
 795     cs->kvm_vcpu_dirty = true;
 796
 797     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 798     if (ret >= 0) {
 799         /* Success; set condition code. */
 800         setcc(cpu, ret);
 801         ret = 0;
 802     } else if (ret < -1) {
 803         /*
 804          * Failure.
 805          * If an I/O interrupt had been dequeued, we have to reinject it.
 806          */
 807         if (run->s390_tsch.dequeued) {
 808             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 809             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 810             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 811             uint32_t io_int_word = run->s390_tsch.io_int_word;
 812             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 813                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 814
 815             kvm_s390_interrupt_internal(cpu, type,
 816                                         ((uint32_t)subchannel_id << 16)
 817                                         | subchannel_nr,
 818                                         ((uint64_t)io_int_parm << 32)
 819                                         | io_int_word, 1);
 820         }
 821         ret = 0;
 822     }
 823     return ret;
 824 }
 825
 826 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 827 {
 828     S390CPU *cpu = S390_CPU(cs);
 829     int ret = 0;
 830
 831     switch (run->exit_reason) {
 832         case KVM_EXIT_S390_SIEIC:
 833             ret = handle_intercept(cpu);
 834             break;
 835         case KVM_EXIT_S390_RESET:
 836             qemu_system_reset_request();
 837             break;
 838         case KVM_EXIT_S390_TSCH:
 839             ret = handle_tsch(cpu);
 840             break;
 841         default:
 842             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 843             break;
 844     }
 845
 846     if (ret == 0) {
 847         ret = EXCP_INTERRUPT;
 848     }
 849     return ret;
 850 }
 851
 852 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 853 {
 854     return true;
 855 }
 856
 857 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 858 {
 859     return 1;
 860 }
 861
 862 int kvm_arch_on_sigbus(int code, void *addr)
 863 {
 864     return 1;
 865 }
 866
 867 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 868                            uint16_t subchannel_nr, uint32_t io_int_parm,
 869                            uint32_t io_int_word)
 870 {
 871     uint32_t type;
 872
 873     type = ((subchannel_id & 0xff00) << 24) |
 874         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 875     kvm_s390_interrupt_internal(cpu, type,
 876                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 877                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 878 }
 879
 880 void kvm_s390_crw_mchk(S390CPU *cpu)
 881 {
 882     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 883                                 0x00400f1d40330000, 1);
 884 }
 885
 886 void kvm_s390_enable_css_support(S390CPU *cpu)
 887 {
 888     struct kvm_enable_cap cap = {};
 889     int r;
 890
 891     /* Activate host kernel channel subsystem support. */
 892     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 893     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 894     assert(r == 0);
 895 }
 896
 897 void kvm_arch_init_irq_routing(KVMState *s)
 898 {
 899 }
 900
 901 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 902                                     int vq, bool assign)
 903 {
 904     struct kvm_ioeventfd kick = {
 905         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 906         KVM_IOEVENTFD_FLAG_DATAMATCH,
 907         .fd = event_notifier_get_fd(notifier),
 908         .datamatch = vq,
 909         .addr = sch,
 910         .len = 8,
 911     };
 912     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 913         return -ENOSYS;
 914     }
 915     if (!assign) {
 916         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 917     }
 918     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 919 }