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 static int cap_async_pf;
  91
  92 static void *legacy_s390_alloc(size_t size);
  93
  94 int kvm_arch_init(KVMState *s)
  95 {
  96     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  97     cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
  98     if (!kvm_check_extension(s, KVM_CAP_S390_GMAP)
  99         || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
 100         phys_mem_set_alloc(legacy_s390_alloc);
 101     }
 102     return 0;
 103 }
 104
 105 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 106 {
 107     return cpu->cpu_index;
 108 }
 109
 110 int kvm_arch_init_vcpu(CPUState *cpu)
 111 {
 112     /* nothing todo yet */
 113     return 0;
 114 }
 115
 116 void kvm_arch_reset_vcpu(CPUState *cpu)
 117 {
 118     /* The initial reset call is needed here to reset in-kernel
 119      * vcpu data that we can't access directly from QEMU
 120      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 121      * Before this ioctl cpu_synchronize_state() is called in common kvm
 122      * code (kvm-all) */
 123     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 124         perror("Can't reset vcpu\n");
 125     }
 126 }
 127
 128 int kvm_arch_put_registers(CPUState *cs, int level)
 129 {
 130     S390CPU *cpu = S390_CPU(cs);
 131     CPUS390XState *env = &cpu->env;
 132     struct kvm_one_reg reg;
 133     struct kvm_sregs sregs;
 134     struct kvm_regs regs;
 135     int ret;
 136     int i;
 137
 138     /* always save the PSW  and the GPRS*/
 139     cs->kvm_run->psw_addr = env->psw.addr;
 140     cs->kvm_run->psw_mask = env->psw.mask;
 141
 142     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 143         for (i = 0; i < 16; i++) {
 144             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 145             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 146         }
 147     } else {
 148         for (i = 0; i < 16; i++) {
 149             regs.gprs[i] = env->regs[i];
 150         }
 151         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 152         if (ret < 0) {
 153             return ret;
 154         }
 155     }
 156
 157     /* Do we need to save more than that? */
 158     if (level == KVM_PUT_RUNTIME_STATE) {
 159         return 0;
 160     }
 161
 162     reg.id = KVM_REG_S390_CPU_TIMER;
 163     reg.addr = (__u64)&(env->cputm);
 164     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 165     if (ret < 0) {
 166         return ret;
 167     }
 168
 169     reg.id = KVM_REG_S390_CLOCK_COMP;
 170     reg.addr = (__u64)&(env->ckc);
 171     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 172     if (ret < 0) {
 173         return ret;
 174     }
 175
 176     reg.id = KVM_REG_S390_TODPR;
 177     reg.addr = (__u64)&(env->todpr);
 178     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 179     if (ret < 0) {
 180         return ret;
 181     }
 182
 183     if (cap_async_pf) {
 184         reg.id = KVM_REG_S390_PFTOKEN;
 185         reg.addr = (__u64)&(env->pfault_token);
 186         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 187         if (ret < 0) {
 188             return ret;
 189         }
 190
 191         reg.id = KVM_REG_S390_PFCOMPARE;
 192         reg.addr = (__u64)&(env->pfault_compare);
 193         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 194         if (ret < 0) {
 195             return ret;
 196         }
 197
 198         reg.id = KVM_REG_S390_PFSELECT;
 199         reg.addr = (__u64)&(env->pfault_select);
 200         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 201         if (ret < 0) {
 202             return ret;
 203         }
 204     }
 205
 206     if (cap_sync_regs &&
 207         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 208         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 209         for (i = 0; i < 16; i++) {
 210             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 211             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 212         }
 213         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 214         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 215     } else {
 216         for (i = 0; i < 16; i++) {
 217             sregs.acrs[i] = env->aregs[i];
 218             sregs.crs[i] = env->cregs[i];
 219         }
 220         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 221         if (ret < 0) {
 222             return ret;
 223         }
 224     }
 225
 226     /* Finally the prefix */
 227     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 228         cs->kvm_run->s.regs.prefix = env->psa;
 229         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 230     } else {
 231         /* prefix is only supported via sync regs */
 232     }
 233     return 0;
 234 }
 235
 236 int kvm_arch_get_registers(CPUState *cs)
 237 {
 238     S390CPU *cpu = S390_CPU(cs);
 239     CPUS390XState *env = &cpu->env;
 240     struct kvm_one_reg reg;
 241     struct kvm_sregs sregs;
 242     struct kvm_regs regs;
 243     int i, r;
 244
 245     /* get the PSW */
 246     env->psw.addr = cs->kvm_run->psw_addr;
 247     env->psw.mask = cs->kvm_run->psw_mask;
 248
 249     /* the GPRS */
 250     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 251         for (i = 0; i < 16; i++) {
 252             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 253         }
 254     } else {
 255         r = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 256         if (r < 0) {
 257             return r;
 258         }
 259          for (i = 0; i < 16; i++) {
 260             env->regs[i] = regs.gprs[i];
 261         }
 262     }
 263
 264     /* The ACRS and CRS */
 265     if (cap_sync_regs &&
 266         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 267         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 268         for (i = 0; i < 16; i++) {
 269             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 270             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 271         }
 272     } else {
 273         r = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 274         if (r < 0) {
 275             return r;
 276         }
 277          for (i = 0; i < 16; i++) {
 278             env->aregs[i] = sregs.acrs[i];
 279             env->cregs[i] = sregs.crs[i];
 280         }
 281     }
 282
 283     /* The prefix */
 284     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 285         env->psa = cs->kvm_run->s.regs.prefix;
 286     }
 287
 288     /* One Regs */
 289     reg.id = KVM_REG_S390_CPU_TIMER;
 290     reg.addr = (__u64)&(env->cputm);
 291     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 292     if (r < 0) {
 293         return r;
 294     }
 295
 296     reg.id = KVM_REG_S390_CLOCK_COMP;
 297     reg.addr = (__u64)&(env->ckc);
 298     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 299     if (r < 0) {
 300         return r;
 301     }
 302
 303     reg.id = KVM_REG_S390_TODPR;
 304     reg.addr = (__u64)&(env->todpr);
 305     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 306     if (r < 0) {
 307         return r;
 308     }
 309
 310     if (cap_async_pf) {
 311         reg.id = KVM_REG_S390_PFTOKEN;
 312         reg.addr = (__u64)&(env->pfault_token);
 313         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 314         if (r < 0) {
 315             return r;
 316         }
 317
 318         reg.id = KVM_REG_S390_PFCOMPARE;
 319         reg.addr = (__u64)&(env->pfault_compare);
 320         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 321         if (r < 0) {
 322             return r;
 323         }
 324
 325         reg.id = KVM_REG_S390_PFSELECT;
 326         reg.addr = (__u64)&(env->pfault_select);
 327         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 328         if (r < 0) {
 329             return r;
 330         }
 331     }
 332
 333     return 0;
 334 }
 335
 336 /*
 337  * Legacy layout for s390:
 338  * Older S390 KVM requires the topmost vma of the RAM to be
 339  * smaller than an system defined value, which is at least 256GB.
 340  * Larger systems have larger values. We put the guest between
 341  * the end of data segment (system break) and this value. We
 342  * use 32GB as a base to have enough room for the system break
 343  * to grow. We also have to use MAP parameters that avoid
 344  * read-only mapping of guest pages.
 345  */
 346 static void *legacy_s390_alloc(size_t size)
 347 {
 348     void *mem;
 349
 350     mem = mmap((void *) 0x800000000ULL, size,
 351                PROT_EXEC|PROT_READ|PROT_WRITE,
 352                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 353     return mem == MAP_FAILED ? NULL : mem;
 354 }
 355
 356 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 357 {
 358     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 359
 360     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 361         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 362         return -EINVAL;
 363     }
 364     return 0;
 365 }
 366
 367 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 368 {
 369     uint8_t t[4];
 370     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 371
 372     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 373         return -EINVAL;
 374     } else if (memcmp(t, diag_501, 4)) {
 375         return -EINVAL;
 376     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 377         return -EINVAL;
 378     }
 379
 380     return 0;
 381 }
 382
 383 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 384 {
 385 }
 386
 387 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 388 {
 389 }
 390
 391 int kvm_arch_process_async_events(CPUState *cs)
 392 {
 393     return cs->halted;
 394 }
 395
 396 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 397                                  uint64_t parm64, int vm)
 398 {
 399     CPUState *cs = CPU(cpu);
 400     struct kvm_s390_interrupt kvmint;
 401     int r;
 402
 403     if (!cs->kvm_state) {
 404         return;
 405     }
 406
 407     kvmint.type = type;
 408     kvmint.parm = parm;
 409     kvmint.parm64 = parm64;
 410
 411     if (vm) {
 412         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 413     } else {
 414         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 415     }
 416
 417     if (r < 0) {
 418         fprintf(stderr, "KVM failed to inject interrupt\n");
 419         exit(1);
 420     }
 421 }
 422
 423 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 424 {
 425     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 426                                 token, 1);
 427 }
 428
 429 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 430 {
 431     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 432 }
 433
 434 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 435 {
 436     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 437 }
 438
 439 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 440                                  uint16_t ipbh0)
 441 {
 442     CPUS390XState *env = &cpu->env;
 443     uint64_t sccb;
 444     uint32_t code;
 445     int r = 0;
 446
 447     cpu_synchronize_state(CPU(cpu));
 448     sccb = env->regs[ipbh0 & 0xf];
 449     code = env->regs[(ipbh0 & 0xf0) >> 4];
 450
 451     r = sclp_service_call(env, sccb, code);
 452     if (r < 0) {
 453         enter_pgmcheck(cpu, -r);
 454     } else {
 455         setcc(cpu, r);
 456     }
 457
 458     return 0;
 459 }
 460
 461 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 462                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 463 {
 464     CPUS390XState *env = &cpu->env;
 465
 466     if (ipa0 != 0xb2) {
 467         /* Not handled for now. */
 468         return -1;
 469     }
 470
 471     cpu_synchronize_state(CPU(cpu));
 472
 473     switch (ipa1) {
 474     case PRIV_XSCH:
 475         ioinst_handle_xsch(cpu, env->regs[1]);
 476         break;
 477     case PRIV_CSCH:
 478         ioinst_handle_csch(cpu, env->regs[1]);
 479         break;
 480     case PRIV_HSCH:
 481         ioinst_handle_hsch(cpu, env->regs[1]);
 482         break;
 483     case PRIV_MSCH:
 484         ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb);
 485         break;
 486     case PRIV_SSCH:
 487         ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb);
 488         break;
 489     case PRIV_STCRW:
 490         ioinst_handle_stcrw(cpu, run->s390_sieic.ipb);
 491         break;
 492     case PRIV_STSCH:
 493         ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb);
 494         break;
 495     case PRIV_TSCH:
 496         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 497         fprintf(stderr, "Spurious tsch intercept\n");
 498         break;
 499     case PRIV_CHSC:
 500         ioinst_handle_chsc(cpu, run->s390_sieic.ipb);
 501         break;
 502     case PRIV_TPI:
 503         /* This should have been handled by kvm already. */
 504         fprintf(stderr, "Spurious tpi intercept\n");
 505         break;
 506     case PRIV_SCHM:
 507         ioinst_handle_schm(cpu, env->regs[1], env->regs[2],
 508                            run->s390_sieic.ipb);
 509         break;
 510     case PRIV_RSCH:
 511         ioinst_handle_rsch(cpu, env->regs[1]);
 512         break;
 513     case PRIV_RCHP:
 514         ioinst_handle_rchp(cpu, env->regs[1]);
 515         break;
 516     case PRIV_STCPS:
 517         /* We do not provide this instruction, it is suppressed. */
 518         break;
 519     case PRIV_SAL:
 520         ioinst_handle_sal(cpu, env->regs[1]);
 521         break;
 522     case PRIV_SIGA:
 523         /* Not provided, set CC = 3 for subchannel not operational */
 524         setcc(cpu, 3);
 525         break;
 526     default:
 527         return -1;
 528     }
 529
 530     return 0;
 531 }
 532
 533 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 534                        uint8_t ipa0, uint8_t ipa1)
 535 {
 536     int r = 0;
 537     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 538     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 539
 540     DPRINTF("KVM: PRIV: %d\n", ipa1);
 541     switch (ipa1) {
 542         case PRIV_SCLP_CALL:
 543             r = kvm_sclp_service_call(cpu, run, ipbh0);
 544             break;
 545         default:
 546             r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 547             if (r == -1) {
 548                 DPRINTF("KVM: unhandled PRIV: 0x%x\n", ipa1);
 549             }
 550             break;
 551     }
 552
 553     return r;
 554 }
 555
 556 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 557 {
 558     CPUS390XState *env = &cpu->env;
 559     int ret;
 560
 561     cpu_synchronize_state(CPU(cpu));
 562     ret = s390_virtio_hypercall(env);
 563     if (ret == -EINVAL) {
 564         enter_pgmcheck(cpu, PGM_SPECIFICATION);
 565         return 0;
 566     }
 567
 568     return ret;
 569 }
 570
 571 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 572 {
 573     uint64_t r1, r3;
 574
 575     cpu_synchronize_state(CPU(cpu));
 576     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 577     r3 = run->s390_sieic.ipa & 0x000f;
 578     handle_diag_308(&cpu->env, r1, r3);
 579 }
 580
 581 #define DIAG_KVM_CODE_MASK 0x000000000000ffff
 582
 583 static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
 584 {
 585     int r = 0;
 586     uint16_t func_code;
 587
 588     /*
 589      * For any diagnose call we support, bits 48-63 of the resulting
 590      * address specify the function code; the remainder is ignored.
 591      */
 592     func_code = decode_basedisp_rs(&cpu->env, ipb) & DIAG_KVM_CODE_MASK;
 593     switch (func_code) {
 594     case DIAG_IPL:
 595         kvm_handle_diag_308(cpu, run);
 596         break;
 597     case DIAG_KVM_HYPERCALL:
 598         r = handle_hypercall(cpu, run);
 599         break;
 600     case DIAG_KVM_BREAKPOINT:
 601         sleep(10);
 602         break;
 603     default:
 604         DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
 605         r = -1;
 606         break;
 607     }
 608
 609     return r;
 610 }
 611
 612 static int kvm_s390_cpu_start(S390CPU *cpu)
 613 {
 614     s390_add_running_cpu(cpu);
 615     qemu_cpu_kick(CPU(cpu));
 616     DPRINTF("DONE: KVM cpu start: %p\n", &cpu->env);
 617     return 0;
 618 }
 619
 620 int kvm_s390_cpu_restart(S390CPU *cpu)
 621 {
 622     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 623     s390_add_running_cpu(cpu);
 624     qemu_cpu_kick(CPU(cpu));
 625     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 626     return 0;
 627 }
 628
 629 static void sigp_initial_cpu_reset(void *arg)
 630 {
 631     CPUState *cpu = arg;
 632     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 633
 634     cpu_synchronize_state(cpu);
 635     scc->initial_cpu_reset(cpu);
 636 }
 637
 638 #define SIGP_ORDER_MASK 0x000000ff
 639
 640 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 641 {
 642     CPUS390XState *env = &cpu->env;
 643     uint8_t order_code;
 644     uint16_t cpu_addr;
 645     S390CPU *target_cpu;
 646     uint64_t *statusreg = &env->regs[ipa1 >> 4];
 647     int cc;
 648
 649     cpu_synchronize_state(CPU(cpu));
 650
 651     /* get order code */
 652     order_code = decode_basedisp_rs(env, run->s390_sieic.ipb) & SIGP_ORDER_MASK;
 653
 654     cpu_addr = env->regs[ipa1 & 0x0f];
 655     target_cpu = s390_cpu_addr2state(cpu_addr);
 656     if (target_cpu == NULL) {
 657         cc = 3;    /* not operational */
 658         goto out;
 659     }
 660
 661     switch (order_code) {
 662     case SIGP_START:
 663         cc = kvm_s390_cpu_start(target_cpu);
 664         break;
 665     case SIGP_RESTART:
 666         cc = kvm_s390_cpu_restart(target_cpu);
 667         break;
 668     case SIGP_SET_ARCH:
 669         *statusreg &= 0xffffffff00000000UL;
 670         *statusreg |= SIGP_STAT_INVALID_PARAMETER;
 671         cc = 1;   /* status stored */
 672         break;
 673     case SIGP_INITIAL_CPU_RESET:
 674         run_on_cpu(CPU(target_cpu), sigp_initial_cpu_reset, CPU(target_cpu));
 675         cc = 0;
 676         break;
 677     default:
 678         DPRINTF("KVM: unknown SIGP: 0x%x\n", order_code);
 679         *statusreg &= 0xffffffff00000000UL;
 680         *statusreg |= SIGP_STAT_INVALID_ORDER;
 681         cc = 1;   /* status stored */
 682         break;
 683     }
 684
 685 out:
 686     setcc(cpu, cc);
 687     return 0;
 688 }
 689
 690 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 691 {
 692     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 693     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 694     int r = -1;
 695
 696     DPRINTF("handle_instruction 0x%x 0x%x\n",
 697             run->s390_sieic.ipa, run->s390_sieic.ipb);
 698     switch (ipa0) {
 699     case IPA0_B2:
 700     case IPA0_B9:
 701     case IPA0_EB:
 702         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 703         break;
 704     case IPA0_DIAG:
 705         r = handle_diag(cpu, run, run->s390_sieic.ipb);
 706         break;
 707     case IPA0_SIGP:
 708         r = handle_sigp(cpu, run, ipa1);
 709         break;
 710     }
 711
 712     if (r < 0) {
 713         enter_pgmcheck(cpu, 0x0001);
 714     }
 715 }
 716
 717 static bool is_special_wait_psw(CPUState *cs)
 718 {
 719     /* signal quiesce */
 720     return cs->kvm_run->psw_addr == 0xfffUL;
 721 }
 722
 723 static int handle_intercept(S390CPU *cpu)
 724 {
 725     CPUState *cs = CPU(cpu);
 726     struct kvm_run *run = cs->kvm_run;
 727     int icpt_code = run->s390_sieic.icptcode;
 728     int r = 0;
 729
 730     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 731             (long)cs->kvm_run->psw_addr);
 732     switch (icpt_code) {
 733         case ICPT_INSTRUCTION:
 734             handle_instruction(cpu, run);
 735             break;
 736         case ICPT_WAITPSW:
 737             /* disabled wait, since enabled wait is handled in kernel */
 738             if (s390_del_running_cpu(cpu) == 0) {
 739                 if (is_special_wait_psw(cs)) {
 740                     qemu_system_shutdown_request();
 741                 } else {
 742                     QObject *data;
 743
 744                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 745                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 746                     qobject_decref(data);
 747                     vm_stop(RUN_STATE_GUEST_PANICKED);
 748                 }
 749             }
 750             r = EXCP_HALTED;
 751             break;
 752         case ICPT_CPU_STOP:
 753             if (s390_del_running_cpu(cpu) == 0) {
 754                 qemu_system_shutdown_request();
 755             }
 756             r = EXCP_HALTED;
 757             break;
 758         case ICPT_SOFT_INTERCEPT:
 759             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 760             exit(1);
 761             break;
 762         case ICPT_IO:
 763             fprintf(stderr, "KVM unimplemented icpt IO\n");
 764             exit(1);
 765             break;
 766         default:
 767             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 768             exit(1);
 769             break;
 770     }
 771
 772     return r;
 773 }
 774
 775 static int handle_tsch(S390CPU *cpu)
 776 {
 777     CPUS390XState *env = &cpu->env;
 778     CPUState *cs = CPU(cpu);
 779     struct kvm_run *run = cs->kvm_run;
 780     int ret;
 781
 782     cpu_synchronize_state(cs);
 783
 784     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 785     if (ret >= 0) {
 786         /* Success; set condition code. */
 787         setcc(cpu, ret);
 788         ret = 0;
 789     } else if (ret < -1) {
 790         /*
 791          * Failure.
 792          * If an I/O interrupt had been dequeued, we have to reinject it.
 793          */
 794         if (run->s390_tsch.dequeued) {
 795             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 796             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 797             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 798             uint32_t io_int_word = run->s390_tsch.io_int_word;
 799             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 800                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 801
 802             kvm_s390_interrupt_internal(cpu, type,
 803                                         ((uint32_t)subchannel_id << 16)
 804                                         | subchannel_nr,
 805                                         ((uint64_t)io_int_parm << 32)
 806                                         | io_int_word, 1);
 807         }
 808         ret = 0;
 809     }
 810     return ret;
 811 }
 812
 813 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 814 {
 815     S390CPU *cpu = S390_CPU(cs);
 816     int ret = 0;
 817
 818     switch (run->exit_reason) {
 819         case KVM_EXIT_S390_SIEIC:
 820             ret = handle_intercept(cpu);
 821             break;
 822         case KVM_EXIT_S390_RESET:
 823             qemu_system_reset_request();
 824             break;
 825         case KVM_EXIT_S390_TSCH:
 826             ret = handle_tsch(cpu);
 827             break;
 828         default:
 829             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 830             break;
 831     }
 832
 833     if (ret == 0) {
 834         ret = EXCP_INTERRUPT;
 835     }
 836     return ret;
 837 }
 838
 839 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 840 {
 841     return true;
 842 }
 843
 844 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 845 {
 846     return 1;
 847 }
 848
 849 int kvm_arch_on_sigbus(int code, void *addr)
 850 {
 851     return 1;
 852 }
 853
 854 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 855                            uint16_t subchannel_nr, uint32_t io_int_parm,
 856                            uint32_t io_int_word)
 857 {
 858     uint32_t type;
 859
 860     type = ((subchannel_id & 0xff00) << 24) |
 861         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 862     kvm_s390_interrupt_internal(cpu, type,
 863                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 864                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 865 }
 866
 867 void kvm_s390_crw_mchk(S390CPU *cpu)
 868 {
 869     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 870                                 0x00400f1d40330000, 1);
 871 }
 872
 873 void kvm_s390_enable_css_support(S390CPU *cpu)
 874 {
 875     struct kvm_enable_cap cap = {};
 876     int r;
 877
 878     /* Activate host kernel channel subsystem support. */
 879     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 880     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 881     assert(r == 0);
 882 }
 883
 884 void kvm_arch_init_irq_routing(KVMState *s)
 885 {
 886 }
 887
 888 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 889                                     int vq, bool assign)
 890 {
 891     struct kvm_ioeventfd kick = {
 892         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 893         KVM_IOEVENTFD_FLAG_DATAMATCH,
 894         .fd = event_notifier_get_fd(notifier),
 895         .datamatch = vq,
 896         .addr = sch,
 897         .len = 8,
 898     };
 899     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 900         return -ENOSYS;
 901     }
 902     if (!assign) {
 903         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 904     }
 905     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 906 }