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_KVM_HYPERCALL              0x500
  76 #define DIAG_KVM_BREAKPOINT             0x501
  77
  78 #define ICPT_INSTRUCTION                0x04
  79 #define ICPT_WAITPSW                    0x1c
  80 #define ICPT_SOFT_INTERCEPT             0x24
  81 #define ICPT_CPU_STOP                   0x28
  82 #define ICPT_IO                         0x40
  83
  84 #define SIGP_RESTART                    0x06
  85 #define SIGP_INITIAL_CPU_RESET          0x0b
  86 #define SIGP_STORE_STATUS_ADDR          0x0e
  87 #define SIGP_SET_ARCH                   0x12
  88
  89 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  90     KVM_CAP_LAST_INFO
  91 };
  92
  93 static int cap_sync_regs;
  94
  95 int kvm_arch_init(KVMState *s)
  96 {
  97     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  98     return 0;
  99 }
 100
 101 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 102 {
 103     return cpu->cpu_index;
 104 }
 105
 106 int kvm_arch_init_vcpu(CPUState *cpu)
 107 {
 108     /* nothing todo yet */
 109     return 0;
 110 }
 111
 112 void kvm_arch_reset_vcpu(CPUState *cpu)
 113 {
 114     /* The initial reset call is needed here to reset in-kernel
 115      * vcpu data that we can't access directly from QEMU
 116      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 117      * Before this ioctl cpu_synchronize_state() is called in common kvm
 118      * code (kvm-all) */
 119     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 120         perror("Can't reset vcpu\n");
 121     }
 122 }
 123
 124 int kvm_arch_put_registers(CPUState *cs, int level)
 125 {
 126     S390CPU *cpu = S390_CPU(cs);
 127     CPUS390XState *env = &cpu->env;
 128     struct kvm_one_reg reg;
 129     struct kvm_sregs sregs;
 130     struct kvm_regs regs;
 131     int ret;
 132     int i;
 133
 134     /* always save the PSW  and the GPRS*/
 135     cs->kvm_run->psw_addr = env->psw.addr;
 136     cs->kvm_run->psw_mask = env->psw.mask;
 137
 138     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 139         for (i = 0; i < 16; i++) {
 140             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 141             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 142         }
 143     } else {
 144         for (i = 0; i < 16; i++) {
 145             regs.gprs[i] = env->regs[i];
 146         }
 147         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 148         if (ret < 0) {
 149             return ret;
 150         }
 151     }
 152
 153     if (env->runtime_reg_dirty_mask == KVM_S390_RUNTIME_DIRTY_FULL) {
 154         reg.id = KVM_REG_S390_CPU_TIMER;
 155         reg.addr = (__u64)&(env->cputm);
 156         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 157         if (ret < 0) {
 158             return ret;
 159         }
 160
 161         reg.id = KVM_REG_S390_CLOCK_COMP;
 162         reg.addr = (__u64)&(env->ckc);
 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_TODPR;
 169         reg.addr = (__u64)&(env->todpr);
 170         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 171         if (ret < 0) {
 172             return ret;
 173         }
 174     }
 175     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_NONE;
 176
 177     /* Do we need to save more than that? */
 178     if (level == KVM_PUT_RUNTIME_STATE) {
 179         return 0;
 180     }
 181
 182     if (cap_sync_regs &&
 183         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 184         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 185         for (i = 0; i < 16; i++) {
 186             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 187             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 188         }
 189         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 190         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 191     } else {
 192         for (i = 0; i < 16; i++) {
 193             sregs.acrs[i] = env->aregs[i];
 194             sregs.crs[i] = env->cregs[i];
 195         }
 196         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 197         if (ret < 0) {
 198             return ret;
 199         }
 200     }
 201
 202     /* Finally the prefix */
 203     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 204         cs->kvm_run->s.regs.prefix = env->psa;
 205         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 206     } else {
 207         /* prefix is only supported via sync regs */
 208     }
 209     return 0;
 210 }
 211
 212 int kvm_arch_get_registers(CPUState *cs)
 213 {
 214     S390CPU *cpu = S390_CPU(cs);
 215     CPUS390XState *env = &cpu->env;
 216     struct kvm_one_reg reg;
 217     int r;
 218
 219     r = kvm_s390_get_registers_partial(cs);
 220     if (r < 0) {
 221         return r;
 222     }
 223
 224     reg.id = KVM_REG_S390_CPU_TIMER;
 225     reg.addr = (__u64)&(env->cputm);
 226     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 227     if (r < 0) {
 228         return r;
 229     }
 230
 231     reg.id = KVM_REG_S390_CLOCK_COMP;
 232     reg.addr = (__u64)&(env->ckc);
 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_TODPR;
 239     reg.addr = (__u64)&(env->todpr);
 240     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 241     if (r < 0) {
 242         return r;
 243     }
 244
 245     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_FULL;
 246     return 0;
 247 }
 248
 249 int kvm_s390_get_registers_partial(CPUState *cs)
 250 {
 251     S390CPU *cpu = S390_CPU(cs);
 252     CPUS390XState *env = &cpu->env;
 253     struct kvm_sregs sregs;
 254     struct kvm_regs regs;
 255     int ret;
 256     int i;
 257
 258     if (env->runtime_reg_dirty_mask) {
 259         return 0;
 260     }
 261
 262     /* get the PSW */
 263     env->psw.addr = cs->kvm_run->psw_addr;
 264     env->psw.mask = cs->kvm_run->psw_mask;
 265
 266     /* the GPRS */
 267     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 268         for (i = 0; i < 16; i++) {
 269             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 270         }
 271     } else {
 272         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 273         if (ret < 0) {
 274             return ret;
 275         }
 276          for (i = 0; i < 16; i++) {
 277             env->regs[i] = regs.gprs[i];
 278         }
 279     }
 280
 281     /* The ACRS and CRS */
 282     if (cap_sync_regs &&
 283         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 284         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 285         for (i = 0; i < 16; i++) {
 286             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 287             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 288         }
 289     } else {
 290         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 291         if (ret < 0) {
 292             return ret;
 293         }
 294          for (i = 0; i < 16; i++) {
 295             env->aregs[i] = sregs.acrs[i];
 296             env->cregs[i] = sregs.crs[i];
 297         }
 298     }
 299
 300     /* Finally the prefix */
 301     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 302         env->psa = cs->kvm_run->s.regs.prefix;
 303     } else {
 304         /* no prefix without sync regs */
 305     }
 306
 307     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_PARTIAL;
 308     return 0;
 309 }
 310
 311 /*
 312  * Legacy layout for s390:
 313  * Older S390 KVM requires the topmost vma of the RAM to be
 314  * smaller than an system defined value, which is at least 256GB.
 315  * Larger systems have larger values. We put the guest between
 316  * the end of data segment (system break) and this value. We
 317  * use 32GB as a base to have enough room for the system break
 318  * to grow. We also have to use MAP parameters that avoid
 319  * read-only mapping of guest pages.
 320  */
 321 static void *legacy_s390_alloc(ram_addr_t size)
 322 {
 323     void *mem;
 324
 325     mem = mmap((void *) 0x800000000ULL, size,
 326                PROT_EXEC|PROT_READ|PROT_WRITE,
 327                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 328     if (mem == MAP_FAILED) {
 329         fprintf(stderr, "Allocating RAM failed\n");
 330         abort();
 331     }
 332     return mem;
 333 }
 334
 335 void *kvm_arch_vmalloc(ram_addr_t size)
 336 {
 337     /* Can we use the standard allocation ? */
 338     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 339         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 340         return NULL;
 341     } else {
 342         return legacy_s390_alloc(size);
 343     }
 344 }
 345
 346 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 347 {
 348     S390CPU *cpu = S390_CPU(cs);
 349     CPUS390XState *env = &cpu->env;
 350     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 351
 352     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 353         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 354         return -EINVAL;
 355     }
 356     return 0;
 357 }
 358
 359 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 360 {
 361     S390CPU *cpu = S390_CPU(cs);
 362     CPUS390XState *env = &cpu->env;
 363     uint8_t t[4];
 364     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 365
 366     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 367         return -EINVAL;
 368     } else if (memcmp(t, diag_501, 4)) {
 369         return -EINVAL;
 370     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 371         return -EINVAL;
 372     }
 373
 374     return 0;
 375 }
 376
 377 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 378 {
 379 }
 380
 381 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 382 {
 383 }
 384
 385 int kvm_arch_process_async_events(CPUState *cs)
 386 {
 387     return cs->halted;
 388 }
 389
 390 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 391                                  uint64_t parm64, int vm)
 392 {
 393     CPUState *cs = CPU(cpu);
 394     struct kvm_s390_interrupt kvmint;
 395     int r;
 396
 397     if (!cs->kvm_state) {
 398         return;
 399     }
 400
 401     kvmint.type = type;
 402     kvmint.parm = parm;
 403     kvmint.parm64 = parm64;
 404
 405     if (vm) {
 406         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 407     } else {
 408         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 409     }
 410
 411     if (r < 0) {
 412         fprintf(stderr, "KVM failed to inject interrupt\n");
 413         exit(1);
 414     }
 415 }
 416
 417 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 418 {
 419     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 420                                 token, 1);
 421 }
 422
 423 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 424 {
 425     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 426 }
 427
 428 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 429 {
 430     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 431 }
 432
 433 static inline void setcc(S390CPU *cpu, uint64_t cc)
 434 {
 435     CPUS390XState *env = &cpu->env;
 436     CPUState *cs = CPU(cpu);
 437
 438     cs->kvm_run->psw_mask &= ~(3ull << 44);
 439     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 440
 441     env->psw.mask &= ~(3ul << 44);
 442     env->psw.mask |= (cc & 3) << 44;
 443 }
 444
 445 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 446                                  uint16_t ipbh0)
 447 {
 448     CPUS390XState *env = &cpu->env;
 449     uint32_t sccb;
 450     uint64_t code;
 451     int r = 0;
 452
 453     cpu_synchronize_state(env);
 454     sccb = env->regs[ipbh0 & 0xf];
 455     code = env->regs[(ipbh0 & 0xf0) >> 4];
 456
 457     r = sclp_service_call(sccb, code);
 458     if (r < 0) {
 459         enter_pgmcheck(cpu, -r);
 460     }
 461     setcc(cpu, r);
 462
 463     return 0;
 464 }
 465
 466 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 467                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 468 {
 469     int r = 0;
 470     int no_cc = 0;
 471     CPUS390XState *env = &cpu->env;
 472     CPUState *cs = ENV_GET_CPU(env);
 473
 474     if (ipa0 != 0xb2) {
 475         /* Not handled for now. */
 476         return -1;
 477     }
 478
 479     kvm_s390_get_registers_partial(cs);
 480     cs->kvm_vcpu_dirty = true;
 481
 482     switch (ipa1) {
 483     case PRIV_XSCH:
 484         r = ioinst_handle_xsch(env, env->regs[1]);
 485         break;
 486     case PRIV_CSCH:
 487         r = ioinst_handle_csch(env, env->regs[1]);
 488         break;
 489     case PRIV_HSCH:
 490         r = ioinst_handle_hsch(env, env->regs[1]);
 491         break;
 492     case PRIV_MSCH:
 493         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 494         break;
 495     case PRIV_SSCH:
 496         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 497         break;
 498     case PRIV_STCRW:
 499         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 500         break;
 501     case PRIV_STSCH:
 502         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 503         break;
 504     case PRIV_TSCH:
 505         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 506         fprintf(stderr, "Spurious tsch intercept\n");
 507         break;
 508     case PRIV_CHSC:
 509         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 510         break;
 511     case PRIV_TPI:
 512         /* This should have been handled by kvm already. */
 513         fprintf(stderr, "Spurious tpi intercept\n");
 514         break;
 515     case PRIV_SCHM:
 516         no_cc = 1;
 517         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 518                                run->s390_sieic.ipb);
 519         break;
 520     case PRIV_RSCH:
 521         r = ioinst_handle_rsch(env, env->regs[1]);
 522         break;
 523     case PRIV_RCHP:
 524         r = ioinst_handle_rchp(env, env->regs[1]);
 525         break;
 526     case PRIV_STCPS:
 527         /* We do not provide this instruction, it is suppressed. */
 528         no_cc = 1;
 529         r = 0;
 530         break;
 531     case PRIV_SAL:
 532         no_cc = 1;
 533         r = ioinst_handle_sal(env, env->regs[1]);
 534         break;
 535     default:
 536         r = -1;
 537         break;
 538     }
 539
 540     if (r >= 0) {
 541         if (!no_cc) {
 542             setcc(cpu, r);
 543         }
 544         r = 0;
 545     } else if (r < -1) {
 546         r = 0;
 547     }
 548     return r;
 549 }
 550
 551 static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 552 {
 553     int ret = 0;
 554     uint16_t ipa = (ipa0 << 8) | ipa1;
 555
 556     switch (ipa) {
 557     case IPA0_B2 | PRIV_CSCH:
 558     case IPA0_B2 | PRIV_HSCH:
 559     case IPA0_B2 | PRIV_MSCH:
 560     case IPA0_B2 | PRIV_SSCH:
 561     case IPA0_B2 | PRIV_STSCH:
 562     case IPA0_B2 | PRIV_TPI:
 563     case IPA0_B2 | PRIV_SAL:
 564     case IPA0_B2 | PRIV_RSCH:
 565     case IPA0_B2 | PRIV_STCRW:
 566     case IPA0_B2 | PRIV_STCPS:
 567     case IPA0_B2 | PRIV_RCHP:
 568     case IPA0_B2 | PRIV_SCHM:
 569     case IPA0_B2 | PRIV_CHSC:
 570     case IPA0_B2 | PRIV_SIGA:
 571     case IPA0_B2 | PRIV_XSCH:
 572     case IPA0_B9 | PRIV_EQBS:
 573     case IPA0_EB | PRIV_SQBS:
 574         ret = 1;
 575         break;
 576     }
 577
 578     return ret;
 579 }
 580
 581 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 582                        uint8_t ipa0, uint8_t ipa1)
 583 {
 584     int r = 0;
 585     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 586     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 587
 588     dprintf("KVM: PRIV: %d\n", ipa1);
 589     switch (ipa1) {
 590         case PRIV_SCLP_CALL:
 591             r = kvm_sclp_service_call(cpu, run, ipbh0);
 592             break;
 593         default:
 594             if (is_ioinst(ipa0, ipa1, ipb)) {
 595                 r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 596                 if (r == -1) {
 597                     setcc(cpu, 3);
 598                     r = 0;
 599                 }
 600             } else {
 601                 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 602                 r = -1;
 603             }
 604             break;
 605     }
 606
 607     return r;
 608 }
 609
 610 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 611 {
 612     CPUState *cs = ENV_GET_CPU(env);
 613
 614     kvm_s390_get_registers_partial(cs);
 615     cs->kvm_vcpu_dirty = true;
 616     env->regs[2] = s390_virtio_hypercall(env);
 617
 618     return 0;
 619 }
 620
 621 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 622 {
 623     int r = 0;
 624
 625     switch (ipb_code) {
 626         case DIAG_KVM_HYPERCALL:
 627             r = handle_hypercall(env, run);
 628             break;
 629         case DIAG_KVM_BREAKPOINT:
 630             sleep(10);
 631             break;
 632         default:
 633             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 634             r = -1;
 635             break;
 636     }
 637
 638     return r;
 639 }
 640
 641 static int s390_cpu_restart(S390CPU *cpu)
 642 {
 643     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 644     s390_add_running_cpu(cpu);
 645     qemu_cpu_kick(CPU(cpu));
 646     dprintf("DONE: SIGP cpu restart: %p\n", &cpu->env);
 647     return 0;
 648 }
 649
 650 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 651 {
 652     /* XXX */
 653     fprintf(stderr, "XXX SIGP store status\n");
 654     return -1;
 655 }
 656
 657 static int s390_cpu_initial_reset(S390CPU *cpu)
 658 {
 659     CPUS390XState *env = &cpu->env;
 660     int i;
 661
 662     s390_del_running_cpu(cpu);
 663     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 664         perror("cannot init reset vcpu");
 665     }
 666
 667     /* Manually zero out all registers */
 668     cpu_synchronize_state(env);
 669     for (i = 0; i < 16; i++) {
 670         env->regs[i] = 0;
 671     }
 672
 673     dprintf("DONE: SIGP initial reset: %p\n", env);
 674     return 0;
 675 }
 676
 677 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 678 {
 679     CPUS390XState *env = &cpu->env;
 680     uint8_t order_code;
 681     uint32_t parameter;
 682     uint16_t cpu_addr;
 683     uint8_t t;
 684     int r = -1;
 685     S390CPU *target_cpu;
 686     CPUS390XState *target_env;
 687
 688     cpu_synchronize_state(env);
 689
 690     /* get order code */
 691     order_code = run->s390_sieic.ipb >> 28;
 692     if (order_code > 0) {
 693         order_code = env->regs[order_code];
 694     }
 695     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 696
 697     /* get parameters */
 698     t = (ipa1 & 0xf0) >> 4;
 699     if (!(t % 2)) {
 700         t++;
 701     }
 702
 703     parameter = env->regs[t] & 0x7ffffe00;
 704     cpu_addr = env->regs[ipa1 & 0x0f];
 705
 706     target_cpu = s390_cpu_addr2state(cpu_addr);
 707     if (target_cpu == NULL) {
 708         goto out;
 709     }
 710     target_env = &target_cpu->env;
 711
 712     switch (order_code) {
 713         case SIGP_RESTART:
 714             r = s390_cpu_restart(target_cpu);
 715             break;
 716         case SIGP_STORE_STATUS_ADDR:
 717             r = s390_store_status(target_env, parameter);
 718             break;
 719         case SIGP_SET_ARCH:
 720             /* make the caller panic */
 721             return -1;
 722         case SIGP_INITIAL_CPU_RESET:
 723             r = s390_cpu_initial_reset(target_cpu);
 724             break;
 725         default:
 726             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 727             break;
 728     }
 729
 730 out:
 731     setcc(cpu, r ? 3 : 0);
 732     return 0;
 733 }
 734
 735 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 736 {
 737     CPUS390XState *env = &cpu->env;
 738     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 739     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 740     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 741     int r = -1;
 742
 743     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 744     switch (ipa0) {
 745     case IPA0_B2:
 746     case IPA0_B9:
 747     case IPA0_EB:
 748         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 749         break;
 750     case IPA0_DIAG:
 751         r = handle_diag(env, run, ipb_code);
 752         break;
 753     case IPA0_SIGP:
 754         r = handle_sigp(cpu, run, ipa1);
 755         break;
 756     }
 757
 758     if (r < 0) {
 759         enter_pgmcheck(cpu, 0x0001);
 760     }
 761     return 0;
 762 }
 763
 764 static bool is_special_wait_psw(CPUState *cs)
 765 {
 766     /* signal quiesce */
 767     return cs->kvm_run->psw_addr == 0xfffUL;
 768 }
 769
 770 static int handle_intercept(S390CPU *cpu)
 771 {
 772     CPUState *cs = CPU(cpu);
 773     struct kvm_run *run = cs->kvm_run;
 774     int icpt_code = run->s390_sieic.icptcode;
 775     int r = 0;
 776
 777     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 778             (long)cs->kvm_run->psw_addr);
 779     switch (icpt_code) {
 780         case ICPT_INSTRUCTION:
 781             r = handle_instruction(cpu, run);
 782             break;
 783         case ICPT_WAITPSW:
 784             /* disabled wait, since enabled wait is handled in kernel */
 785             if (s390_del_running_cpu(cpu) == 0) {
 786                 if (is_special_wait_psw(cs)) {
 787                     qemu_system_shutdown_request();
 788                 } else {
 789                     QObject *data;
 790
 791                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 792                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 793                     qobject_decref(data);
 794                     vm_stop(RUN_STATE_GUEST_PANICKED);
 795                 }
 796             }
 797             r = EXCP_HALTED;
 798             break;
 799         case ICPT_CPU_STOP:
 800             if (s390_del_running_cpu(cpu) == 0) {
 801                 qemu_system_shutdown_request();
 802             }
 803             r = EXCP_HALTED;
 804             break;
 805         case ICPT_SOFT_INTERCEPT:
 806             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 807             exit(1);
 808             break;
 809         case ICPT_IO:
 810             fprintf(stderr, "KVM unimplemented icpt IO\n");
 811             exit(1);
 812             break;
 813         default:
 814             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 815             exit(1);
 816             break;
 817     }
 818
 819     return r;
 820 }
 821
 822 static int handle_tsch(S390CPU *cpu)
 823 {
 824     CPUS390XState *env = &cpu->env;
 825     CPUState *cs = CPU(cpu);
 826     struct kvm_run *run = cs->kvm_run;
 827     int ret;
 828
 829     kvm_s390_get_registers_partial(cs);
 830     cs->kvm_vcpu_dirty = true;
 831
 832     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 833     if (ret >= 0) {
 834         /* Success; set condition code. */
 835         setcc(cpu, ret);
 836         ret = 0;
 837     } else if (ret < -1) {
 838         /*
 839          * Failure.
 840          * If an I/O interrupt had been dequeued, we have to reinject it.
 841          */
 842         if (run->s390_tsch.dequeued) {
 843             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 844             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 845             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 846             uint32_t io_int_word = run->s390_tsch.io_int_word;
 847             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 848                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 849
 850             kvm_s390_interrupt_internal(cpu, type,
 851                                         ((uint32_t)subchannel_id << 16)
 852                                         | subchannel_nr,
 853                                         ((uint64_t)io_int_parm << 32)
 854                                         | io_int_word, 1);
 855         }
 856         ret = 0;
 857     }
 858     return ret;
 859 }
 860
 861 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 862 {
 863     S390CPU *cpu = S390_CPU(cs);
 864     int ret = 0;
 865
 866     switch (run->exit_reason) {
 867         case KVM_EXIT_S390_SIEIC:
 868             ret = handle_intercept(cpu);
 869             break;
 870         case KVM_EXIT_S390_RESET:
 871             qemu_system_reset_request();
 872             break;
 873         case KVM_EXIT_S390_TSCH:
 874             ret = handle_tsch(cpu);
 875             break;
 876         default:
 877             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 878             break;
 879     }
 880
 881     if (ret == 0) {
 882         ret = EXCP_INTERRUPT;
 883     }
 884     return ret;
 885 }
 886
 887 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 888 {
 889     return true;
 890 }
 891
 892 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 893 {
 894     return 1;
 895 }
 896
 897 int kvm_arch_on_sigbus(int code, void *addr)
 898 {
 899     return 1;
 900 }
 901
 902 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 903                            uint16_t subchannel_nr, uint32_t io_int_parm,
 904                            uint32_t io_int_word)
 905 {
 906     uint32_t type;
 907
 908     type = ((subchannel_id & 0xff00) << 24) |
 909         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 910     kvm_s390_interrupt_internal(cpu, type,
 911                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 912                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 913 }
 914
 915 void kvm_s390_crw_mchk(S390CPU *cpu)
 916 {
 917     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 918                                 0x00400f1d40330000, 1);
 919 }
 920
 921 void kvm_s390_enable_css_support(S390CPU *cpu)
 922 {
 923     struct kvm_enable_cap cap = {};
 924     int r;
 925
 926     /* Activate host kernel channel subsystem support. */
 927     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 928     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 929     assert(r == 0);
 930 }