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_B2_SCLP_CALL               0x20
  57 #define PRIV_B2_CSCH                    0x30
  58 #define PRIV_B2_HSCH                    0x31
  59 #define PRIV_B2_MSCH                    0x32
  60 #define PRIV_B2_SSCH                    0x33
  61 #define PRIV_B2_STSCH                   0x34
  62 #define PRIV_B2_TSCH                    0x35
  63 #define PRIV_B2_TPI                     0x36
  64 #define PRIV_B2_SAL                     0x37
  65 #define PRIV_B2_RSCH                    0x38
  66 #define PRIV_B2_STCRW                   0x39
  67 #define PRIV_B2_STCPS                   0x3a
  68 #define PRIV_B2_RCHP                    0x3b
  69 #define PRIV_B2_SCHM                    0x3c
  70 #define PRIV_B2_CHSC                    0x5f
  71 #define PRIV_B2_SIGA                    0x74
  72 #define PRIV_B2_XSCH                    0x76
  73
  74 #define PRIV_EB_SQBS                    0x8a
  75
  76 #define PRIV_B9_EQBS                    0x9c
  77
  78 #define DIAG_IPL                        0x308
  79 #define DIAG_KVM_HYPERCALL              0x500
  80 #define DIAG_KVM_BREAKPOINT             0x501
  81
  82 #define ICPT_INSTRUCTION                0x04
  83 #define ICPT_WAITPSW                    0x1c
  84 #define ICPT_SOFT_INTERCEPT             0x24
  85 #define ICPT_CPU_STOP                   0x28
  86 #define ICPT_IO                         0x40
  87
  88 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  89     KVM_CAP_LAST_INFO
  90 };
  91
  92 static int cap_sync_regs;
  93 static int cap_async_pf;
  94
  95 static void *legacy_s390_alloc(size_t size);
  96
  97 int kvm_arch_init(KVMState *s)
  98 {
  99     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
 100     cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
 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     /* Do we need to save more than that? */
 161     if (level == KVM_PUT_RUNTIME_STATE) {
 162         return 0;
 163     }
 164
 165     reg.id = KVM_REG_S390_CPU_TIMER;
 166     reg.addr = (__u64)&(env->cputm);
 167     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 168     if (ret < 0) {
 169         return ret;
 170     }
 171
 172     reg.id = KVM_REG_S390_CLOCK_COMP;
 173     reg.addr = (__u64)&(env->ckc);
 174     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 175     if (ret < 0) {
 176         return ret;
 177     }
 178
 179     reg.id = KVM_REG_S390_TODPR;
 180     reg.addr = (__u64)&(env->todpr);
 181     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 182     if (ret < 0) {
 183         return ret;
 184     }
 185
 186     if (cap_async_pf) {
 187         reg.id = KVM_REG_S390_PFTOKEN;
 188         reg.addr = (__u64)&(env->pfault_token);
 189         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 190         if (ret < 0) {
 191             return ret;
 192         }
 193
 194         reg.id = KVM_REG_S390_PFCOMPARE;
 195         reg.addr = (__u64)&(env->pfault_compare);
 196         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 197         if (ret < 0) {
 198             return ret;
 199         }
 200
 201         reg.id = KVM_REG_S390_PFSELECT;
 202         reg.addr = (__u64)&(env->pfault_select);
 203         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 204         if (ret < 0) {
 205             return ret;
 206         }
 207     }
 208
 209     if (cap_sync_regs &&
 210         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 211         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 212         for (i = 0; i < 16; i++) {
 213             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 214             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 215         }
 216         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 217         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 218     } else {
 219         for (i = 0; i < 16; i++) {
 220             sregs.acrs[i] = env->aregs[i];
 221             sregs.crs[i] = env->cregs[i];
 222         }
 223         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 224         if (ret < 0) {
 225             return ret;
 226         }
 227     }
 228
 229     /* Finally the prefix */
 230     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 231         cs->kvm_run->s.regs.prefix = env->psa;
 232         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 233     } else {
 234         /* prefix is only supported via sync regs */
 235     }
 236     return 0;
 237 }
 238
 239 int kvm_arch_get_registers(CPUState *cs)
 240 {
 241     S390CPU *cpu = S390_CPU(cs);
 242     CPUS390XState *env = &cpu->env;
 243     struct kvm_one_reg reg;
 244     struct kvm_sregs sregs;
 245     struct kvm_regs regs;
 246     int i, r;
 247
 248     /* get the PSW */
 249     env->psw.addr = cs->kvm_run->psw_addr;
 250     env->psw.mask = cs->kvm_run->psw_mask;
 251
 252     /* the GPRS */
 253     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 254         for (i = 0; i < 16; i++) {
 255             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 256         }
 257     } else {
 258         r = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 259         if (r < 0) {
 260             return r;
 261         }
 262          for (i = 0; i < 16; i++) {
 263             env->regs[i] = regs.gprs[i];
 264         }
 265     }
 266
 267     /* The ACRS and CRS */
 268     if (cap_sync_regs &&
 269         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 270         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 271         for (i = 0; i < 16; i++) {
 272             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 273             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 274         }
 275     } else {
 276         r = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 277         if (r < 0) {
 278             return r;
 279         }
 280          for (i = 0; i < 16; i++) {
 281             env->aregs[i] = sregs.acrs[i];
 282             env->cregs[i] = sregs.crs[i];
 283         }
 284     }
 285
 286     /* The prefix */
 287     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 288         env->psa = cs->kvm_run->s.regs.prefix;
 289     }
 290
 291     /* One Regs */
 292     reg.id = KVM_REG_S390_CPU_TIMER;
 293     reg.addr = (__u64)&(env->cputm);
 294     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 295     if (r < 0) {
 296         return r;
 297     }
 298
 299     reg.id = KVM_REG_S390_CLOCK_COMP;
 300     reg.addr = (__u64)&(env->ckc);
 301     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 302     if (r < 0) {
 303         return r;
 304     }
 305
 306     reg.id = KVM_REG_S390_TODPR;
 307     reg.addr = (__u64)&(env->todpr);
 308     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 309     if (r < 0) {
 310         return r;
 311     }
 312
 313     if (cap_async_pf) {
 314         reg.id = KVM_REG_S390_PFTOKEN;
 315         reg.addr = (__u64)&(env->pfault_token);
 316         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 317         if (r < 0) {
 318             return r;
 319         }
 320
 321         reg.id = KVM_REG_S390_PFCOMPARE;
 322         reg.addr = (__u64)&(env->pfault_compare);
 323         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 324         if (r < 0) {
 325             return r;
 326         }
 327
 328         reg.id = KVM_REG_S390_PFSELECT;
 329         reg.addr = (__u64)&(env->pfault_select);
 330         r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 331         if (r < 0) {
 332             return r;
 333         }
 334     }
 335
 336     return 0;
 337 }
 338
 339 /*
 340  * Legacy layout for s390:
 341  * Older S390 KVM requires the topmost vma of the RAM to be
 342  * smaller than an system defined value, which is at least 256GB.
 343  * Larger systems have larger values. We put the guest between
 344  * the end of data segment (system break) and this value. We
 345  * use 32GB as a base to have enough room for the system break
 346  * to grow. We also have to use MAP parameters that avoid
 347  * read-only mapping of guest pages.
 348  */
 349 static void *legacy_s390_alloc(size_t size)
 350 {
 351     void *mem;
 352
 353     mem = mmap((void *) 0x800000000ULL, size,
 354                PROT_EXEC|PROT_READ|PROT_WRITE,
 355                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 356     return mem == MAP_FAILED ? NULL : mem;
 357 }
 358
 359 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 360 {
 361     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 362
 363     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 364         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 365         return -EINVAL;
 366     }
 367     return 0;
 368 }
 369
 370 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 371 {
 372     uint8_t t[4];
 373     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 374
 375     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 376         return -EINVAL;
 377     } else if (memcmp(t, diag_501, 4)) {
 378         return -EINVAL;
 379     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 380         return -EINVAL;
 381     }
 382
 383     return 0;
 384 }
 385
 386 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 387 {
 388 }
 389
 390 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 391 {
 392 }
 393
 394 int kvm_arch_process_async_events(CPUState *cs)
 395 {
 396     return cs->halted;
 397 }
 398
 399 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 400                                  uint64_t parm64, int vm)
 401 {
 402     CPUState *cs = CPU(cpu);
 403     struct kvm_s390_interrupt kvmint;
 404     int r;
 405
 406     if (!cs->kvm_state) {
 407         return;
 408     }
 409
 410     kvmint.type = type;
 411     kvmint.parm = parm;
 412     kvmint.parm64 = parm64;
 413
 414     if (vm) {
 415         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 416     } else {
 417         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 418     }
 419
 420     if (r < 0) {
 421         fprintf(stderr, "KVM failed to inject interrupt\n");
 422         exit(1);
 423     }
 424 }
 425
 426 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 427 {
 428     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 429                                 token, 1);
 430 }
 431
 432 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 433 {
 434     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 435 }
 436
 437 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 438 {
 439     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 440 }
 441
 442 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 443                                  uint16_t ipbh0)
 444 {
 445     CPUS390XState *env = &cpu->env;
 446     uint64_t sccb;
 447     uint32_t code;
 448     int r = 0;
 449
 450     cpu_synchronize_state(CPU(cpu));
 451     sccb = env->regs[ipbh0 & 0xf];
 452     code = env->regs[(ipbh0 & 0xf0) >> 4];
 453
 454     r = sclp_service_call(env, sccb, code);
 455     if (r < 0) {
 456         enter_pgmcheck(cpu, -r);
 457     } else {
 458         setcc(cpu, r);
 459     }
 460
 461     return 0;
 462 }
 463
 464 static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 465 {
 466     CPUS390XState *env = &cpu->env;
 467     int rc = 0;
 468     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 469
 470     cpu_synchronize_state(CPU(cpu));
 471
 472     switch (ipa1) {
 473     case PRIV_B2_XSCH:
 474         ioinst_handle_xsch(cpu, env->regs[1]);
 475         break;
 476     case PRIV_B2_CSCH:
 477         ioinst_handle_csch(cpu, env->regs[1]);
 478         break;
 479     case PRIV_B2_HSCH:
 480         ioinst_handle_hsch(cpu, env->regs[1]);
 481         break;
 482     case PRIV_B2_MSCH:
 483         ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb);
 484         break;
 485     case PRIV_B2_SSCH:
 486         ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb);
 487         break;
 488     case PRIV_B2_STCRW:
 489         ioinst_handle_stcrw(cpu, run->s390_sieic.ipb);
 490         break;
 491     case PRIV_B2_STSCH:
 492         ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb);
 493         break;
 494     case PRIV_B2_TSCH:
 495         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 496         fprintf(stderr, "Spurious tsch intercept\n");
 497         break;
 498     case PRIV_B2_CHSC:
 499         ioinst_handle_chsc(cpu, run->s390_sieic.ipb);
 500         break;
 501     case PRIV_B2_TPI:
 502         /* This should have been handled by kvm already. */
 503         fprintf(stderr, "Spurious tpi intercept\n");
 504         break;
 505     case PRIV_B2_SCHM:
 506         ioinst_handle_schm(cpu, env->regs[1], env->regs[2],
 507                            run->s390_sieic.ipb);
 508         break;
 509     case PRIV_B2_RSCH:
 510         ioinst_handle_rsch(cpu, env->regs[1]);
 511         break;
 512     case PRIV_B2_RCHP:
 513         ioinst_handle_rchp(cpu, env->regs[1]);
 514         break;
 515     case PRIV_B2_STCPS:
 516         /* We do not provide this instruction, it is suppressed. */
 517         break;
 518     case PRIV_B2_SAL:
 519         ioinst_handle_sal(cpu, env->regs[1]);
 520         break;
 521     case PRIV_B2_SIGA:
 522         /* Not provided, set CC = 3 for subchannel not operational */
 523         setcc(cpu, 3);
 524         break;
 525     case PRIV_B2_SCLP_CALL:
 526         rc = kvm_sclp_service_call(cpu, run, ipbh0);
 527         break;
 528     default:
 529         rc = -1;
 530         DPRINTF("KVM: unhandled PRIV: 0xb2%x\n", ipa1);
 531         break;
 532     }
 533
 534     return rc;
 535 }
 536
 537 static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 538 {
 539     int r = 0;
 540
 541     switch (ipa1) {
 542     case PRIV_B9_EQBS:
 543         /* just inject exception */
 544         r = -1;
 545         break;
 546     default:
 547         r = -1;
 548         DPRINTF("KVM: unhandled PRIV: 0xb9%x\n", ipa1);
 549         break;
 550     }
 551
 552     return r;
 553 }
 554
 555 static int handle_eb(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 556 {
 557     int r = 0;
 558
 559     switch (ipa1) {
 560     case PRIV_EB_SQBS:
 561         /* just inject exception */
 562         r = -1;
 563         break;
 564     default:
 565         r = -1;
 566         DPRINTF("KVM: unhandled PRIV: 0xeb%x\n", ipa1);
 567         break;
 568     }
 569
 570     return r;
 571 }
 572
 573 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 574 {
 575     CPUS390XState *env = &cpu->env;
 576     int ret;
 577
 578     cpu_synchronize_state(CPU(cpu));
 579     ret = s390_virtio_hypercall(env);
 580     if (ret == -EINVAL) {
 581         enter_pgmcheck(cpu, PGM_SPECIFICATION);
 582         return 0;
 583     }
 584
 585     return ret;
 586 }
 587
 588 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 589 {
 590     uint64_t r1, r3;
 591
 592     cpu_synchronize_state(CPU(cpu));
 593     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 594     r3 = run->s390_sieic.ipa & 0x000f;
 595     handle_diag_308(&cpu->env, r1, r3);
 596 }
 597
 598 #define DIAG_KVM_CODE_MASK 0x000000000000ffff
 599
 600 static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
 601 {
 602     int r = 0;
 603     uint16_t func_code;
 604
 605     /*
 606      * For any diagnose call we support, bits 48-63 of the resulting
 607      * address specify the function code; the remainder is ignored.
 608      */
 609     func_code = decode_basedisp_rs(&cpu->env, ipb) & DIAG_KVM_CODE_MASK;
 610     switch (func_code) {
 611     case DIAG_IPL:
 612         kvm_handle_diag_308(cpu, run);
 613         break;
 614     case DIAG_KVM_HYPERCALL:
 615         r = handle_hypercall(cpu, run);
 616         break;
 617     case DIAG_KVM_BREAKPOINT:
 618         sleep(10);
 619         break;
 620     default:
 621         DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
 622         r = -1;
 623         break;
 624     }
 625
 626     return r;
 627 }
 628
 629 static int kvm_s390_cpu_start(S390CPU *cpu)
 630 {
 631     s390_add_running_cpu(cpu);
 632     qemu_cpu_kick(CPU(cpu));
 633     DPRINTF("DONE: KVM cpu start: %p\n", &cpu->env);
 634     return 0;
 635 }
 636
 637 int kvm_s390_cpu_restart(S390CPU *cpu)
 638 {
 639     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 640     s390_add_running_cpu(cpu);
 641     qemu_cpu_kick(CPU(cpu));
 642     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 643     return 0;
 644 }
 645
 646 static void sigp_initial_cpu_reset(void *arg)
 647 {
 648     CPUState *cpu = arg;
 649     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 650
 651     cpu_synchronize_state(cpu);
 652     scc->initial_cpu_reset(cpu);
 653 }
 654
 655 static void sigp_cpu_reset(void *arg)
 656 {
 657     CPUState *cpu = arg;
 658     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 659
 660     cpu_synchronize_state(cpu);
 661     scc->cpu_reset(cpu);
 662 }
 663
 664 #define SIGP_ORDER_MASK 0x000000ff
 665
 666 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 667 {
 668     CPUS390XState *env = &cpu->env;
 669     uint8_t order_code;
 670     uint16_t cpu_addr;
 671     S390CPU *target_cpu;
 672     uint64_t *statusreg = &env->regs[ipa1 >> 4];
 673     int cc;
 674
 675     cpu_synchronize_state(CPU(cpu));
 676
 677     /* get order code */
 678     order_code = decode_basedisp_rs(env, run->s390_sieic.ipb) & SIGP_ORDER_MASK;
 679
 680     cpu_addr = env->regs[ipa1 & 0x0f];
 681     target_cpu = s390_cpu_addr2state(cpu_addr);
 682     if (target_cpu == NULL) {
 683         cc = 3;    /* not operational */
 684         goto out;
 685     }
 686
 687     switch (order_code) {
 688     case SIGP_START:
 689         cc = kvm_s390_cpu_start(target_cpu);
 690         break;
 691     case SIGP_RESTART:
 692         cc = kvm_s390_cpu_restart(target_cpu);
 693         break;
 694     case SIGP_SET_ARCH:
 695         *statusreg &= 0xffffffff00000000UL;
 696         *statusreg |= SIGP_STAT_INVALID_PARAMETER;
 697         cc = 1;   /* status stored */
 698         break;
 699     case SIGP_INITIAL_CPU_RESET:
 700         run_on_cpu(CPU(target_cpu), sigp_initial_cpu_reset, CPU(target_cpu));
 701         cc = 0;
 702         break;
 703     case SIGP_CPU_RESET:
 704         run_on_cpu(CPU(target_cpu), sigp_cpu_reset, CPU(target_cpu));
 705         cc = 0;
 706         break;
 707     default:
 708         DPRINTF("KVM: unknown SIGP: 0x%x\n", order_code);
 709         *statusreg &= 0xffffffff00000000UL;
 710         *statusreg |= SIGP_STAT_INVALID_ORDER;
 711         cc = 1;   /* status stored */
 712         break;
 713     }
 714
 715 out:
 716     setcc(cpu, cc);
 717     return 0;
 718 }
 719
 720 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 721 {
 722     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 723     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 724     int r = -1;
 725
 726     DPRINTF("handle_instruction 0x%x 0x%x\n",
 727             run->s390_sieic.ipa, run->s390_sieic.ipb);
 728     switch (ipa0) {
 729     case IPA0_B2:
 730         r = handle_b2(cpu, run, ipa1);
 731         break;
 732     case IPA0_B9:
 733         r = handle_b9(cpu, run, ipa1);
 734         break;
 735     case IPA0_EB:
 736         r = handle_eb(cpu, run, ipa1);
 737         break;
 738     case IPA0_DIAG:
 739         r = handle_diag(cpu, run, run->s390_sieic.ipb);
 740         break;
 741     case IPA0_SIGP:
 742         r = handle_sigp(cpu, run, ipa1);
 743         break;
 744     }
 745
 746     if (r < 0) {
 747         enter_pgmcheck(cpu, 0x0001);
 748     }
 749 }
 750
 751 static bool is_special_wait_psw(CPUState *cs)
 752 {
 753     /* signal quiesce */
 754     return cs->kvm_run->psw_addr == 0xfffUL;
 755 }
 756
 757 static int handle_intercept(S390CPU *cpu)
 758 {
 759     CPUState *cs = CPU(cpu);
 760     struct kvm_run *run = cs->kvm_run;
 761     int icpt_code = run->s390_sieic.icptcode;
 762     int r = 0;
 763
 764     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 765             (long)cs->kvm_run->psw_addr);
 766     switch (icpt_code) {
 767         case ICPT_INSTRUCTION:
 768             handle_instruction(cpu, run);
 769             break;
 770         case ICPT_WAITPSW:
 771             /* disabled wait, since enabled wait is handled in kernel */
 772             if (s390_del_running_cpu(cpu) == 0) {
 773                 if (is_special_wait_psw(cs)) {
 774                     qemu_system_shutdown_request();
 775                 } else {
 776                     QObject *data;
 777
 778                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 779                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 780                     qobject_decref(data);
 781                     vm_stop(RUN_STATE_GUEST_PANICKED);
 782                 }
 783             }
 784             r = EXCP_HALTED;
 785             break;
 786         case ICPT_CPU_STOP:
 787             if (s390_del_running_cpu(cpu) == 0) {
 788                 qemu_system_shutdown_request();
 789             }
 790             r = EXCP_HALTED;
 791             break;
 792         case ICPT_SOFT_INTERCEPT:
 793             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 794             exit(1);
 795             break;
 796         case ICPT_IO:
 797             fprintf(stderr, "KVM unimplemented icpt IO\n");
 798             exit(1);
 799             break;
 800         default:
 801             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 802             exit(1);
 803             break;
 804     }
 805
 806     return r;
 807 }
 808
 809 static int handle_tsch(S390CPU *cpu)
 810 {
 811     CPUS390XState *env = &cpu->env;
 812     CPUState *cs = CPU(cpu);
 813     struct kvm_run *run = cs->kvm_run;
 814     int ret;
 815
 816     cpu_synchronize_state(cs);
 817
 818     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 819     if (ret >= 0) {
 820         /* Success; set condition code. */
 821         setcc(cpu, ret);
 822         ret = 0;
 823     } else if (ret < -1) {
 824         /*
 825          * Failure.
 826          * If an I/O interrupt had been dequeued, we have to reinject it.
 827          */
 828         if (run->s390_tsch.dequeued) {
 829             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 830             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 831             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 832             uint32_t io_int_word = run->s390_tsch.io_int_word;
 833             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 834                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 835
 836             kvm_s390_interrupt_internal(cpu, type,
 837                                         ((uint32_t)subchannel_id << 16)
 838                                         | subchannel_nr,
 839                                         ((uint64_t)io_int_parm << 32)
 840                                         | io_int_word, 1);
 841         }
 842         ret = 0;
 843     }
 844     return ret;
 845 }
 846
 847 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 848 {
 849     S390CPU *cpu = S390_CPU(cs);
 850     int ret = 0;
 851
 852     switch (run->exit_reason) {
 853         case KVM_EXIT_S390_SIEIC:
 854             ret = handle_intercept(cpu);
 855             break;
 856         case KVM_EXIT_S390_RESET:
 857             qemu_system_reset_request();
 858             break;
 859         case KVM_EXIT_S390_TSCH:
 860             ret = handle_tsch(cpu);
 861             break;
 862         default:
 863             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 864             break;
 865     }
 866
 867     if (ret == 0) {
 868         ret = EXCP_INTERRUPT;
 869     }
 870     return ret;
 871 }
 872
 873 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 874 {
 875     return true;
 876 }
 877
 878 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 879 {
 880     return 1;
 881 }
 882
 883 int kvm_arch_on_sigbus(int code, void *addr)
 884 {
 885     return 1;
 886 }
 887
 888 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 889                            uint16_t subchannel_nr, uint32_t io_int_parm,
 890                            uint32_t io_int_word)
 891 {
 892     uint32_t type;
 893
 894     if (io_int_word & IO_INT_WORD_AI) {
 895         type = KVM_S390_INT_IO(1, 0, 0, 0);
 896     } else {
 897         type = ((subchannel_id & 0xff00) << 24) |
 898             ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 899     }
 900     kvm_s390_interrupt_internal(cpu, type,
 901                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 902                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 903 }
 904
 905 void kvm_s390_crw_mchk(S390CPU *cpu)
 906 {
 907     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 908                                 0x00400f1d40330000, 1);
 909 }
 910
 911 void kvm_s390_enable_css_support(S390CPU *cpu)
 912 {
 913     struct kvm_enable_cap cap = {};
 914     int r;
 915
 916     /* Activate host kernel channel subsystem support. */
 917     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 918     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 919     assert(r == 0);
 920 }
 921
 922 void kvm_arch_init_irq_routing(KVMState *s)
 923 {
 924 }
 925
 926 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 927                                     int vq, bool assign)
 928 {
 929     struct kvm_ioeventfd kick = {
 930         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 931         KVM_IOEVENTFD_FLAG_DATAMATCH,
 932         .fd = event_notifier_get_fd(notifier),
 933         .datamatch = vq,
 934         .addr = sch,
 935         .len = 8,
 936     };
 937     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 938         return -ENOSYS;
 939     }
 940     if (!assign) {
 941         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 942     }
 943     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 944 }