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 #include "trace.h"
  40
  41 /* #define DEBUG_KVM */
  42
  43 #ifdef DEBUG_KVM
  44 #define DPRINTF(fmt, ...) \
  45     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  46 #else
  47 #define DPRINTF(fmt, ...) \
  48     do { } while (0)
  49 #endif
  50
  51 #define IPA0_DIAG                       0x8300
  52 #define IPA0_SIGP                       0xae00
  53 #define IPA0_B2                         0xb200
  54 #define IPA0_B9                         0xb900
  55 #define IPA0_EB                         0xeb00
  56
  57 #define PRIV_B2_SCLP_CALL               0x20
  58 #define PRIV_B2_CSCH                    0x30
  59 #define PRIV_B2_HSCH                    0x31
  60 #define PRIV_B2_MSCH                    0x32
  61 #define PRIV_B2_SSCH                    0x33
  62 #define PRIV_B2_STSCH                   0x34
  63 #define PRIV_B2_TSCH                    0x35
  64 #define PRIV_B2_TPI                     0x36
  65 #define PRIV_B2_SAL                     0x37
  66 #define PRIV_B2_RSCH                    0x38
  67 #define PRIV_B2_STCRW                   0x39
  68 #define PRIV_B2_STCPS                   0x3a
  69 #define PRIV_B2_RCHP                    0x3b
  70 #define PRIV_B2_SCHM                    0x3c
  71 #define PRIV_B2_CHSC                    0x5f
  72 #define PRIV_B2_SIGA                    0x74
  73 #define PRIV_B2_XSCH                    0x76
  74
  75 #define PRIV_EB_SQBS                    0x8a
  76
  77 #define PRIV_B9_EQBS                    0x9c
  78
  79 #define DIAG_IPL                        0x308
  80 #define DIAG_KVM_HYPERCALL              0x500
  81 #define DIAG_KVM_BREAKPOINT             0x501
  82
  83 #define ICPT_INSTRUCTION                0x04
  84 #define ICPT_WAITPSW                    0x1c
  85 #define ICPT_SOFT_INTERCEPT             0x24
  86 #define ICPT_CPU_STOP                   0x28
  87 #define ICPT_IO                         0x40
  88
  89 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  90     KVM_CAP_LAST_INFO
  91 };
  92
  93 static int cap_sync_regs;
  94 static int cap_async_pf;
  95
  96 static void *legacy_s390_alloc(size_t size);
  97
  98 int kvm_arch_init(KVMState *s)
  99 {
 100     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
 101     cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
 102     if (!kvm_check_extension(s, KVM_CAP_S390_GMAP)
 103         || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
 104         phys_mem_set_alloc(legacy_s390_alloc);
 105     }
 106     return 0;
 107 }
 108
 109 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 110 {
 111     return cpu->cpu_index;
 112 }
 113
 114 int kvm_arch_init_vcpu(CPUState *cpu)
 115 {
 116     /* nothing todo yet */
 117     return 0;
 118 }
 119
 120 void kvm_arch_reset_vcpu(CPUState *cpu)
 121 {
 122     /* The initial reset call is needed here to reset in-kernel
 123      * vcpu data that we can't access directly from QEMU
 124      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 125      * Before this ioctl cpu_synchronize_state() is called in common kvm
 126      * code (kvm-all) */
 127     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 128         perror("Can't reset vcpu\n");
 129     }
 130 }
 131
 132 int kvm_arch_put_registers(CPUState *cs, int level)
 133 {
 134     S390CPU *cpu = S390_CPU(cs);
 135     CPUS390XState *env = &cpu->env;
 136     struct kvm_sregs sregs;
 137     struct kvm_regs regs;
 138     int r;
 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         r = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 155         if (r < 0) {
 156             return r;
 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     /*
 166      * These ONE_REGS are not protected by a capability. As they are only
 167      * necessary for migration we just trace a possible error, but don't
 168      * return with an error return code.
 169      */
 170     kvm_set_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
 171     kvm_set_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
 172     kvm_set_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
 173     kvm_set_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
 174     kvm_set_one_reg(cs, KVM_REG_S390_PP, &env->pp);
 175
 176     if (cap_async_pf) {
 177         r = kvm_set_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
 178         if (r < 0) {
 179             return r;
 180         }
 181         r = kvm_set_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare);
 182         if (r < 0) {
 183             return r;
 184         }
 185         r = kvm_set_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select);
 186         if (r < 0) {
 187             return r;
 188         }
 189     }
 190
 191     if (cap_sync_regs &&
 192         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 193         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 194         for (i = 0; i < 16; i++) {
 195             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 196             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 197         }
 198         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 199         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 200     } else {
 201         for (i = 0; i < 16; i++) {
 202             sregs.acrs[i] = env->aregs[i];
 203             sregs.crs[i] = env->cregs[i];
 204         }
 205         r = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 206         if (r < 0) {
 207             return r;
 208         }
 209     }
 210
 211     /* Finally the prefix */
 212     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 213         cs->kvm_run->s.regs.prefix = env->psa;
 214         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 215     } else {
 216         /* prefix is only supported via sync regs */
 217     }
 218     return 0;
 219 }
 220
 221 int kvm_arch_get_registers(CPUState *cs)
 222 {
 223     S390CPU *cpu = S390_CPU(cs);
 224     CPUS390XState *env = &cpu->env;
 225     struct kvm_sregs sregs;
 226     struct kvm_regs regs;
 227     int i, r;
 228
 229     /* get the PSW */
 230     env->psw.addr = cs->kvm_run->psw_addr;
 231     env->psw.mask = cs->kvm_run->psw_mask;
 232
 233     /* the GPRS */
 234     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 235         for (i = 0; i < 16; i++) {
 236             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 237         }
 238     } else {
 239         r = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 240         if (r < 0) {
 241             return r;
 242         }
 243          for (i = 0; i < 16; i++) {
 244             env->regs[i] = regs.gprs[i];
 245         }
 246     }
 247
 248     /* The ACRS and CRS */
 249     if (cap_sync_regs &&
 250         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 251         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 252         for (i = 0; i < 16; i++) {
 253             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 254             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 255         }
 256     } else {
 257         r = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 258         if (r < 0) {
 259             return r;
 260         }
 261          for (i = 0; i < 16; i++) {
 262             env->aregs[i] = sregs.acrs[i];
 263             env->cregs[i] = sregs.crs[i];
 264         }
 265     }
 266
 267     /* The prefix */
 268     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 269         env->psa = cs->kvm_run->s.regs.prefix;
 270     }
 271
 272     /*
 273      * These ONE_REGS are not protected by a capability. As they are only
 274      * necessary for migration we just trace a possible error, but don't
 275      * return with an error return code.
 276      */
 277     kvm_get_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm);
 278     kvm_get_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc);
 279     kvm_get_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr);
 280     kvm_get_one_reg(cs, KVM_REG_S390_GBEA, &env->gbea);
 281     kvm_get_one_reg(cs, KVM_REG_S390_PP, &env->pp);
 282
 283     if (cap_async_pf) {
 284         r = kvm_get_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token);
 285         if (r < 0) {
 286             return r;
 287         }
 288         r = kvm_get_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare);
 289         if (r < 0) {
 290             return r;
 291         }
 292         r = kvm_get_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select);
 293         if (r < 0) {
 294             return r;
 295         }
 296     }
 297
 298     return 0;
 299 }
 300
 301 /*
 302  * Legacy layout for s390:
 303  * Older S390 KVM requires the topmost vma of the RAM to be
 304  * smaller than an system defined value, which is at least 256GB.
 305  * Larger systems have larger values. We put the guest between
 306  * the end of data segment (system break) and this value. We
 307  * use 32GB as a base to have enough room for the system break
 308  * to grow. We also have to use MAP parameters that avoid
 309  * read-only mapping of guest pages.
 310  */
 311 static void *legacy_s390_alloc(size_t size)
 312 {
 313     void *mem;
 314
 315     mem = mmap((void *) 0x800000000ULL, size,
 316                PROT_EXEC|PROT_READ|PROT_WRITE,
 317                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 318     return mem == MAP_FAILED ? NULL : mem;
 319 }
 320
 321 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 322 {
 323     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 324
 325     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 326         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 327         return -EINVAL;
 328     }
 329     return 0;
 330 }
 331
 332 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 333 {
 334     uint8_t t[4];
 335     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 336
 337     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 338         return -EINVAL;
 339     } else if (memcmp(t, diag_501, 4)) {
 340         return -EINVAL;
 341     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 342         return -EINVAL;
 343     }
 344
 345     return 0;
 346 }
 347
 348 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
 349                                   target_ulong len, int type)
 350 {
 351     return -ENOSYS;
 352 }
 353
 354 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
 355                                   target_ulong len, int type)
 356 {
 357     return -ENOSYS;
 358 }
 359
 360 void kvm_arch_remove_all_hw_breakpoints(void)
 361 {
 362 }
 363
 364 void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg)
 365 {
 366 }
 367
 368 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 369 {
 370 }
 371
 372 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 373 {
 374 }
 375
 376 int kvm_arch_process_async_events(CPUState *cs)
 377 {
 378     return cs->halted;
 379 }
 380
 381 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 382                                  uint64_t parm64, int vm)
 383 {
 384     CPUState *cs = CPU(cpu);
 385     struct kvm_s390_interrupt kvmint;
 386     int r;
 387
 388     if (!cs->kvm_state) {
 389         return;
 390     }
 391
 392     kvmint.type = type;
 393     kvmint.parm = parm;
 394     kvmint.parm64 = parm64;
 395
 396     if (vm) {
 397         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 398     } else {
 399         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 400     }
 401
 402     if (r < 0) {
 403         fprintf(stderr, "KVM failed to inject interrupt\n");
 404         exit(1);
 405     }
 406 }
 407
 408 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 409 {
 410     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 411                                 token, 1);
 412 }
 413
 414 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 415 {
 416     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 417 }
 418
 419 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 420 {
 421     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 422 }
 423
 424 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 425                                  uint16_t ipbh0)
 426 {
 427     CPUS390XState *env = &cpu->env;
 428     uint64_t sccb;
 429     uint32_t code;
 430     int r = 0;
 431
 432     cpu_synchronize_state(CPU(cpu));
 433     sccb = env->regs[ipbh0 & 0xf];
 434     code = env->regs[(ipbh0 & 0xf0) >> 4];
 435
 436     r = sclp_service_call(env, sccb, code);
 437     if (r < 0) {
 438         enter_pgmcheck(cpu, -r);
 439     } else {
 440         setcc(cpu, r);
 441     }
 442
 443     return 0;
 444 }
 445
 446 static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 447 {
 448     CPUS390XState *env = &cpu->env;
 449     int rc = 0;
 450     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 451
 452     cpu_synchronize_state(CPU(cpu));
 453
 454     switch (ipa1) {
 455     case PRIV_B2_XSCH:
 456         ioinst_handle_xsch(cpu, env->regs[1]);
 457         break;
 458     case PRIV_B2_CSCH:
 459         ioinst_handle_csch(cpu, env->regs[1]);
 460         break;
 461     case PRIV_B2_HSCH:
 462         ioinst_handle_hsch(cpu, env->regs[1]);
 463         break;
 464     case PRIV_B2_MSCH:
 465         ioinst_handle_msch(cpu, env->regs[1], run->s390_sieic.ipb);
 466         break;
 467     case PRIV_B2_SSCH:
 468         ioinst_handle_ssch(cpu, env->regs[1], run->s390_sieic.ipb);
 469         break;
 470     case PRIV_B2_STCRW:
 471         ioinst_handle_stcrw(cpu, run->s390_sieic.ipb);
 472         break;
 473     case PRIV_B2_STSCH:
 474         ioinst_handle_stsch(cpu, env->regs[1], run->s390_sieic.ipb);
 475         break;
 476     case PRIV_B2_TSCH:
 477         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 478         fprintf(stderr, "Spurious tsch intercept\n");
 479         break;
 480     case PRIV_B2_CHSC:
 481         ioinst_handle_chsc(cpu, run->s390_sieic.ipb);
 482         break;
 483     case PRIV_B2_TPI:
 484         /* This should have been handled by kvm already. */
 485         fprintf(stderr, "Spurious tpi intercept\n");
 486         break;
 487     case PRIV_B2_SCHM:
 488         ioinst_handle_schm(cpu, env->regs[1], env->regs[2],
 489                            run->s390_sieic.ipb);
 490         break;
 491     case PRIV_B2_RSCH:
 492         ioinst_handle_rsch(cpu, env->regs[1]);
 493         break;
 494     case PRIV_B2_RCHP:
 495         ioinst_handle_rchp(cpu, env->regs[1]);
 496         break;
 497     case PRIV_B2_STCPS:
 498         /* We do not provide this instruction, it is suppressed. */
 499         break;
 500     case PRIV_B2_SAL:
 501         ioinst_handle_sal(cpu, env->regs[1]);
 502         break;
 503     case PRIV_B2_SIGA:
 504         /* Not provided, set CC = 3 for subchannel not operational */
 505         setcc(cpu, 3);
 506         break;
 507     case PRIV_B2_SCLP_CALL:
 508         rc = kvm_sclp_service_call(cpu, run, ipbh0);
 509         break;
 510     default:
 511         rc = -1;
 512         DPRINTF("KVM: unhandled PRIV: 0xb2%x\n", ipa1);
 513         break;
 514     }
 515
 516     return rc;
 517 }
 518
 519 static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 520 {
 521     int r = 0;
 522
 523     switch (ipa1) {
 524     case PRIV_B9_EQBS:
 525         /* just inject exception */
 526         r = -1;
 527         break;
 528     default:
 529         r = -1;
 530         DPRINTF("KVM: unhandled PRIV: 0xb9%x\n", ipa1);
 531         break;
 532     }
 533
 534     return r;
 535 }
 536
 537 static int handle_eb(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 538 {
 539     int r = 0;
 540
 541     switch (ipa1) {
 542     case PRIV_EB_SQBS:
 543         /* just inject exception */
 544         r = -1;
 545         break;
 546     default:
 547         r = -1;
 548         DPRINTF("KVM: unhandled PRIV: 0xeb%x\n", ipa1);
 549         break;
 550     }
 551
 552     return r;
 553 }
 554
 555 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 556 {
 557     CPUS390XState *env = &cpu->env;
 558     int ret;
 559
 560     cpu_synchronize_state(CPU(cpu));
 561     ret = s390_virtio_hypercall(env);
 562     if (ret == -EINVAL) {
 563         enter_pgmcheck(cpu, PGM_SPECIFICATION);
 564         return 0;
 565     }
 566
 567     return ret;
 568 }
 569
 570 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 571 {
 572     uint64_t r1, r3;
 573
 574     cpu_synchronize_state(CPU(cpu));
 575     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 576     r3 = run->s390_sieic.ipa & 0x000f;
 577     handle_diag_308(&cpu->env, r1, r3);
 578 }
 579
 580 #define DIAG_KVM_CODE_MASK 0x000000000000ffff
 581
 582 static int handle_diag(S390CPU *cpu, struct kvm_run *run, uint32_t ipb)
 583 {
 584     int r = 0;
 585     uint16_t func_code;
 586
 587     /*
 588      * For any diagnose call we support, bits 48-63 of the resulting
 589      * address specify the function code; the remainder is ignored.
 590      */
 591     func_code = decode_basedisp_rs(&cpu->env, ipb) & DIAG_KVM_CODE_MASK;
 592     switch (func_code) {
 593     case DIAG_IPL:
 594         kvm_handle_diag_308(cpu, run);
 595         break;
 596     case DIAG_KVM_HYPERCALL:
 597         r = handle_hypercall(cpu, run);
 598         break;
 599     case DIAG_KVM_BREAKPOINT:
 600         sleep(10);
 601         break;
 602     default:
 603         DPRINTF("KVM: unknown DIAG: 0x%x\n", func_code);
 604         r = -1;
 605         break;
 606     }
 607
 608     return r;
 609 }
 610
 611 static int kvm_s390_cpu_start(S390CPU *cpu)
 612 {
 613     s390_add_running_cpu(cpu);
 614     qemu_cpu_kick(CPU(cpu));
 615     DPRINTF("DONE: KVM cpu start: %p\n", &cpu->env);
 616     return 0;
 617 }
 618
 619 int kvm_s390_cpu_restart(S390CPU *cpu)
 620 {
 621     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 622     s390_add_running_cpu(cpu);
 623     qemu_cpu_kick(CPU(cpu));
 624     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 625     return 0;
 626 }
 627
 628 static void sigp_initial_cpu_reset(void *arg)
 629 {
 630     CPUState *cpu = arg;
 631     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 632
 633     cpu_synchronize_state(cpu);
 634     scc->initial_cpu_reset(cpu);
 635 }
 636
 637 static void sigp_cpu_reset(void *arg)
 638 {
 639     CPUState *cpu = arg;
 640     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 641
 642     cpu_synchronize_state(cpu);
 643     scc->cpu_reset(cpu);
 644 }
 645
 646 #define SIGP_ORDER_MASK 0x000000ff
 647
 648 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 649 {
 650     CPUS390XState *env = &cpu->env;
 651     uint8_t order_code;
 652     uint16_t cpu_addr;
 653     S390CPU *target_cpu;
 654     uint64_t *statusreg = &env->regs[ipa1 >> 4];
 655     int cc;
 656
 657     cpu_synchronize_state(CPU(cpu));
 658
 659     /* get order code */
 660     order_code = decode_basedisp_rs(env, run->s390_sieic.ipb) & SIGP_ORDER_MASK;
 661
 662     cpu_addr = env->regs[ipa1 & 0x0f];
 663     target_cpu = s390_cpu_addr2state(cpu_addr);
 664     if (target_cpu == NULL) {
 665         cc = 3;    /* not operational */
 666         goto out;
 667     }
 668
 669     switch (order_code) {
 670     case SIGP_START:
 671         cc = kvm_s390_cpu_start(target_cpu);
 672         break;
 673     case SIGP_RESTART:
 674         cc = kvm_s390_cpu_restart(target_cpu);
 675         break;
 676     case SIGP_SET_ARCH:
 677         *statusreg &= 0xffffffff00000000UL;
 678         *statusreg |= SIGP_STAT_INVALID_PARAMETER;
 679         cc = 1;   /* status stored */
 680         break;
 681     case SIGP_INITIAL_CPU_RESET:
 682         run_on_cpu(CPU(target_cpu), sigp_initial_cpu_reset, CPU(target_cpu));
 683         cc = 0;
 684         break;
 685     case SIGP_CPU_RESET:
 686         run_on_cpu(CPU(target_cpu), sigp_cpu_reset, CPU(target_cpu));
 687         cc = 0;
 688         break;
 689     default:
 690         DPRINTF("KVM: unknown SIGP: 0x%x\n", order_code);
 691         *statusreg &= 0xffffffff00000000UL;
 692         *statusreg |= SIGP_STAT_INVALID_ORDER;
 693         cc = 1;   /* status stored */
 694         break;
 695     }
 696
 697 out:
 698     setcc(cpu, cc);
 699     return 0;
 700 }
 701
 702 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 703 {
 704     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 705     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 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         r = handle_b2(cpu, run, ipa1);
 713         break;
 714     case IPA0_B9:
 715         r = handle_b9(cpu, run, ipa1);
 716         break;
 717     case IPA0_EB:
 718         r = handle_eb(cpu, run, ipa1);
 719         break;
 720     case IPA0_DIAG:
 721         r = handle_diag(cpu, run, run->s390_sieic.ipb);
 722         break;
 723     case IPA0_SIGP:
 724         r = handle_sigp(cpu, run, ipa1);
 725         break;
 726     }
 727
 728     if (r < 0) {
 729         enter_pgmcheck(cpu, 0x0001);
 730     }
 731 }
 732
 733 static bool is_special_wait_psw(CPUState *cs)
 734 {
 735     /* signal quiesce */
 736     return cs->kvm_run->psw_addr == 0xfffUL;
 737 }
 738
 739 static int handle_intercept(S390CPU *cpu)
 740 {
 741     CPUState *cs = CPU(cpu);
 742     struct kvm_run *run = cs->kvm_run;
 743     int icpt_code = run->s390_sieic.icptcode;
 744     int r = 0;
 745
 746     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 747             (long)cs->kvm_run->psw_addr);
 748     switch (icpt_code) {
 749         case ICPT_INSTRUCTION:
 750             handle_instruction(cpu, run);
 751             break;
 752         case ICPT_WAITPSW:
 753             /* disabled wait, since enabled wait is handled in kernel */
 754             if (s390_del_running_cpu(cpu) == 0) {
 755                 if (is_special_wait_psw(cs)) {
 756                     qemu_system_shutdown_request();
 757                 } else {
 758                     QObject *data;
 759
 760                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 761                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 762                     qobject_decref(data);
 763                     vm_stop(RUN_STATE_GUEST_PANICKED);
 764                 }
 765             }
 766             r = EXCP_HALTED;
 767             break;
 768         case ICPT_CPU_STOP:
 769             if (s390_del_running_cpu(cpu) == 0) {
 770                 qemu_system_shutdown_request();
 771             }
 772             r = EXCP_HALTED;
 773             break;
 774         case ICPT_SOFT_INTERCEPT:
 775             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 776             exit(1);
 777             break;
 778         case ICPT_IO:
 779             fprintf(stderr, "KVM unimplemented icpt IO\n");
 780             exit(1);
 781             break;
 782         default:
 783             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 784             exit(1);
 785             break;
 786     }
 787
 788     return r;
 789 }
 790
 791 static int handle_tsch(S390CPU *cpu)
 792 {
 793     CPUS390XState *env = &cpu->env;
 794     CPUState *cs = CPU(cpu);
 795     struct kvm_run *run = cs->kvm_run;
 796     int ret;
 797
 798     cpu_synchronize_state(cs);
 799
 800     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 801     if (ret >= 0) {
 802         /* Success; set condition code. */
 803         setcc(cpu, ret);
 804         ret = 0;
 805     } else if (ret < -1) {
 806         /*
 807          * Failure.
 808          * If an I/O interrupt had been dequeued, we have to reinject it.
 809          */
 810         if (run->s390_tsch.dequeued) {
 811             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 812             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 813             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 814             uint32_t io_int_word = run->s390_tsch.io_int_word;
 815             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 816                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 817
 818             kvm_s390_interrupt_internal(cpu, type,
 819                                         ((uint32_t)subchannel_id << 16)
 820                                         | subchannel_nr,
 821                                         ((uint64_t)io_int_parm << 32)
 822                                         | io_int_word, 1);
 823         }
 824         ret = 0;
 825     }
 826     return ret;
 827 }
 828
 829 static int kvm_arch_handle_debug_exit(S390CPU *cpu)
 830 {
 831     return -ENOSYS;
 832 }
 833
 834 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 835 {
 836     S390CPU *cpu = S390_CPU(cs);
 837     int ret = 0;
 838
 839     switch (run->exit_reason) {
 840         case KVM_EXIT_S390_SIEIC:
 841             ret = handle_intercept(cpu);
 842             break;
 843         case KVM_EXIT_S390_RESET:
 844             qemu_system_reset_request();
 845             break;
 846         case KVM_EXIT_S390_TSCH:
 847             ret = handle_tsch(cpu);
 848             break;
 849         case KVM_EXIT_DEBUG:
 850             ret = kvm_arch_handle_debug_exit(cpu);
 851             break;
 852         default:
 853             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 854             break;
 855     }
 856
 857     if (ret == 0) {
 858         ret = EXCP_INTERRUPT;
 859     }
 860     return ret;
 861 }
 862
 863 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 864 {
 865     return true;
 866 }
 867
 868 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 869 {
 870     return 1;
 871 }
 872
 873 int kvm_arch_on_sigbus(int code, void *addr)
 874 {
 875     return 1;
 876 }
 877
 878 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 879                            uint16_t subchannel_nr, uint32_t io_int_parm,
 880                            uint32_t io_int_word)
 881 {
 882     uint32_t type;
 883
 884     if (io_int_word & IO_INT_WORD_AI) {
 885         type = KVM_S390_INT_IO(1, 0, 0, 0);
 886     } else {
 887         type = ((subchannel_id & 0xff00) << 24) |
 888             ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 889     }
 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     int r;
 904
 905     /* Activate host kernel channel subsystem support. */
 906     r = kvm_vcpu_enable_cap(CPU(cpu), KVM_CAP_S390_CSS_SUPPORT, 0);
 907     assert(r == 0);
 908 }
 909
 910 void kvm_arch_init_irq_routing(KVMState *s)
 911 {
 912 }
 913
 914 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 915                                     int vq, bool assign)
 916 {
 917     struct kvm_ioeventfd kick = {
 918         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 919         KVM_IOEVENTFD_FLAG_DATAMATCH,
 920         .fd = event_notifier_get_fd(notifier),
 921         .datamatch = vq,
 922         .addr = sch,
 923         .len = 8,
 924     };
 925     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 926         return -ENOSYS;
 927     }
 928     if (!assign) {
 929         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 930     }
 931     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 932 }