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_ram_alloc(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     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 349
 350     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 351         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 352         return -EINVAL;
 353     }
 354     return 0;
 355 }
 356
 357 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 358 {
 359     uint8_t t[4];
 360     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 361
 362     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 363         return -EINVAL;
 364     } else if (memcmp(t, diag_501, 4)) {
 365         return -EINVAL;
 366     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 367         return -EINVAL;
 368     }
 369
 370     return 0;
 371 }
 372
 373 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 374 {
 375 }
 376
 377 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 378 {
 379 }
 380
 381 int kvm_arch_process_async_events(CPUState *cs)
 382 {
 383     return cs->halted;
 384 }
 385
 386 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 387                                  uint64_t parm64, int vm)
 388 {
 389     CPUState *cs = CPU(cpu);
 390     struct kvm_s390_interrupt kvmint;
 391     int r;
 392
 393     if (!cs->kvm_state) {
 394         return;
 395     }
 396
 397     kvmint.type = type;
 398     kvmint.parm = parm;
 399     kvmint.parm64 = parm64;
 400
 401     if (vm) {
 402         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 403     } else {
 404         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 405     }
 406
 407     if (r < 0) {
 408         fprintf(stderr, "KVM failed to inject interrupt\n");
 409         exit(1);
 410     }
 411 }
 412
 413 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 414 {
 415     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 416                                 token, 1);
 417 }
 418
 419 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 420 {
 421     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 422 }
 423
 424 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 425 {
 426     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 427 }
 428
 429 static inline void setcc(S390CPU *cpu, uint64_t cc)
 430 {
 431     CPUS390XState *env = &cpu->env;
 432     CPUState *cs = CPU(cpu);
 433
 434     cs->kvm_run->psw_mask &= ~(3ull << 44);
 435     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 436
 437     env->psw.mask &= ~(3ul << 44);
 438     env->psw.mask |= (cc & 3) << 44;
 439 }
 440
 441 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 442                                  uint16_t ipbh0)
 443 {
 444     CPUS390XState *env = &cpu->env;
 445     uint32_t sccb;
 446     uint64_t code;
 447     int r = 0;
 448
 449     cpu_synchronize_state(CPU(cpu));
 450     sccb = env->regs[ipbh0 & 0xf];
 451     code = env->regs[(ipbh0 & 0xf0) >> 4];
 452
 453     r = sclp_service_call(sccb, code);
 454     if (r < 0) {
 455         enter_pgmcheck(cpu, -r);
 456     }
 457     setcc(cpu, r);
 458
 459     return 0;
 460 }
 461
 462 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 463                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 464 {
 465     int r = 0;
 466     int no_cc = 0;
 467     CPUS390XState *env = &cpu->env;
 468     CPUState *cs = CPU(cpu);
 469
 470     if (ipa0 != 0xb2) {
 471         /* Not handled for now. */
 472         return -1;
 473     }
 474
 475     kvm_s390_get_registers_partial(cs);
 476     cs->kvm_vcpu_dirty = true;
 477
 478     switch (ipa1) {
 479     case PRIV_XSCH:
 480         r = ioinst_handle_xsch(env, env->regs[1]);
 481         break;
 482     case PRIV_CSCH:
 483         r = ioinst_handle_csch(env, env->regs[1]);
 484         break;
 485     case PRIV_HSCH:
 486         r = ioinst_handle_hsch(env, env->regs[1]);
 487         break;
 488     case PRIV_MSCH:
 489         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 490         break;
 491     case PRIV_SSCH:
 492         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 493         break;
 494     case PRIV_STCRW:
 495         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 496         break;
 497     case PRIV_STSCH:
 498         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 499         break;
 500     case PRIV_TSCH:
 501         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 502         fprintf(stderr, "Spurious tsch intercept\n");
 503         break;
 504     case PRIV_CHSC:
 505         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 506         break;
 507     case PRIV_TPI:
 508         /* This should have been handled by kvm already. */
 509         fprintf(stderr, "Spurious tpi intercept\n");
 510         break;
 511     case PRIV_SCHM:
 512         no_cc = 1;
 513         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 514                                run->s390_sieic.ipb);
 515         break;
 516     case PRIV_RSCH:
 517         r = ioinst_handle_rsch(env, env->regs[1]);
 518         break;
 519     case PRIV_RCHP:
 520         r = ioinst_handle_rchp(env, env->regs[1]);
 521         break;
 522     case PRIV_STCPS:
 523         /* We do not provide this instruction, it is suppressed. */
 524         no_cc = 1;
 525         r = 0;
 526         break;
 527     case PRIV_SAL:
 528         no_cc = 1;
 529         r = ioinst_handle_sal(env, env->regs[1]);
 530         break;
 531     default:
 532         r = -1;
 533         break;
 534     }
 535
 536     if (r >= 0) {
 537         if (!no_cc) {
 538             setcc(cpu, r);
 539         }
 540         r = 0;
 541     } else if (r < -1) {
 542         r = 0;
 543     }
 544     return r;
 545 }
 546
 547 static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 548 {
 549     int ret = 0;
 550     uint16_t ipa = (ipa0 << 8) | ipa1;
 551
 552     switch (ipa) {
 553     case IPA0_B2 | PRIV_CSCH:
 554     case IPA0_B2 | PRIV_HSCH:
 555     case IPA0_B2 | PRIV_MSCH:
 556     case IPA0_B2 | PRIV_SSCH:
 557     case IPA0_B2 | PRIV_STSCH:
 558     case IPA0_B2 | PRIV_TPI:
 559     case IPA0_B2 | PRIV_SAL:
 560     case IPA0_B2 | PRIV_RSCH:
 561     case IPA0_B2 | PRIV_STCRW:
 562     case IPA0_B2 | PRIV_STCPS:
 563     case IPA0_B2 | PRIV_RCHP:
 564     case IPA0_B2 | PRIV_SCHM:
 565     case IPA0_B2 | PRIV_CHSC:
 566     case IPA0_B2 | PRIV_SIGA:
 567     case IPA0_B2 | PRIV_XSCH:
 568     case IPA0_B9 | PRIV_EQBS:
 569     case IPA0_EB | PRIV_SQBS:
 570         ret = 1;
 571         break;
 572     }
 573
 574     return ret;
 575 }
 576
 577 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 578                        uint8_t ipa0, uint8_t ipa1)
 579 {
 580     int r = 0;
 581     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 582     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 583
 584     dprintf("KVM: PRIV: %d\n", ipa1);
 585     switch (ipa1) {
 586         case PRIV_SCLP_CALL:
 587             r = kvm_sclp_service_call(cpu, run, ipbh0);
 588             break;
 589         default:
 590             if (is_ioinst(ipa0, ipa1, ipb)) {
 591                 r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 592                 if (r == -1) {
 593                     setcc(cpu, 3);
 594                     r = 0;
 595                 }
 596             } else {
 597                 dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 598                 r = -1;
 599             }
 600             break;
 601     }
 602
 603     return r;
 604 }
 605
 606 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 607 {
 608     CPUState *cs = CPU(cpu);
 609     CPUS390XState *env = &cpu->env;
 610
 611     kvm_s390_get_registers_partial(cs);
 612     cs->kvm_vcpu_dirty = true;
 613     env->regs[2] = s390_virtio_hypercall(env);
 614
 615     return 0;
 616 }
 617
 618 static int handle_diag(S390CPU *cpu, struct kvm_run *run, int ipb_code)
 619 {
 620     int r = 0;
 621
 622     switch (ipb_code) {
 623         case DIAG_KVM_HYPERCALL:
 624             r = handle_hypercall(cpu, run);
 625             break;
 626         case DIAG_KVM_BREAKPOINT:
 627             sleep(10);
 628             break;
 629         default:
 630             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 631             r = -1;
 632             break;
 633     }
 634
 635     return r;
 636 }
 637
 638 static int s390_cpu_restart(S390CPU *cpu)
 639 {
 640     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 641     s390_add_running_cpu(cpu);
 642     qemu_cpu_kick(CPU(cpu));
 643     dprintf("DONE: SIGP cpu restart: %p\n", &cpu->env);
 644     return 0;
 645 }
 646
 647 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 648 {
 649     /* XXX */
 650     fprintf(stderr, "XXX SIGP store status\n");
 651     return -1;
 652 }
 653
 654 static int s390_cpu_initial_reset(S390CPU *cpu)
 655 {
 656     CPUState *cs = CPU(cpu);
 657     CPUS390XState *env = &cpu->env;
 658     int i;
 659
 660     s390_del_running_cpu(cpu);
 661     if (kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL) < 0) {
 662         perror("cannot init reset vcpu");
 663     }
 664
 665     /* Manually zero out all registers */
 666     cpu_synchronize_state(cs);
 667     for (i = 0; i < 16; i++) {
 668         env->regs[i] = 0;
 669     }
 670
 671     dprintf("DONE: SIGP initial reset: %p\n", env);
 672     return 0;
 673 }
 674
 675 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 676 {
 677     CPUS390XState *env = &cpu->env;
 678     uint8_t order_code;
 679     uint32_t parameter;
 680     uint16_t cpu_addr;
 681     uint8_t t;
 682     int r = -1;
 683     S390CPU *target_cpu;
 684     CPUS390XState *target_env;
 685
 686     cpu_synchronize_state(CPU(cpu));
 687
 688     /* get order code */
 689     order_code = run->s390_sieic.ipb >> 28;
 690     if (order_code > 0) {
 691         order_code = env->regs[order_code];
 692     }
 693     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 694
 695     /* get parameters */
 696     t = (ipa1 & 0xf0) >> 4;
 697     if (!(t % 2)) {
 698         t++;
 699     }
 700
 701     parameter = env->regs[t] & 0x7ffffe00;
 702     cpu_addr = env->regs[ipa1 & 0x0f];
 703
 704     target_cpu = s390_cpu_addr2state(cpu_addr);
 705     if (target_cpu == NULL) {
 706         goto out;
 707     }
 708     target_env = &target_cpu->env;
 709
 710     switch (order_code) {
 711         case SIGP_RESTART:
 712             r = s390_cpu_restart(target_cpu);
 713             break;
 714         case SIGP_STORE_STATUS_ADDR:
 715             r = s390_store_status(target_env, parameter);
 716             break;
 717         case SIGP_SET_ARCH:
 718             /* make the caller panic */
 719             return -1;
 720         case SIGP_INITIAL_CPU_RESET:
 721             r = s390_cpu_initial_reset(target_cpu);
 722             break;
 723         default:
 724             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 725             break;
 726     }
 727
 728 out:
 729     setcc(cpu, r ? 3 : 0);
 730     return 0;
 731 }
 732
 733 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 734 {
 735     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 736     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 737     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 738     int r = -1;
 739
 740     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 741     switch (ipa0) {
 742     case IPA0_B2:
 743     case IPA0_B9:
 744     case IPA0_EB:
 745         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 746         break;
 747     case IPA0_DIAG:
 748         r = handle_diag(cpu, run, ipb_code);
 749         break;
 750     case IPA0_SIGP:
 751         r = handle_sigp(cpu, run, ipa1);
 752         break;
 753     }
 754
 755     if (r < 0) {
 756         enter_pgmcheck(cpu, 0x0001);
 757     }
 758     return 0;
 759 }
 760
 761 static bool is_special_wait_psw(CPUState *cs)
 762 {
 763     /* signal quiesce */
 764     return cs->kvm_run->psw_addr == 0xfffUL;
 765 }
 766
 767 static int handle_intercept(S390CPU *cpu)
 768 {
 769     CPUState *cs = CPU(cpu);
 770     struct kvm_run *run = cs->kvm_run;
 771     int icpt_code = run->s390_sieic.icptcode;
 772     int r = 0;
 773
 774     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 775             (long)cs->kvm_run->psw_addr);
 776     switch (icpt_code) {
 777         case ICPT_INSTRUCTION:
 778             r = handle_instruction(cpu, run);
 779             break;
 780         case ICPT_WAITPSW:
 781             /* disabled wait, since enabled wait is handled in kernel */
 782             if (s390_del_running_cpu(cpu) == 0) {
 783                 if (is_special_wait_psw(cs)) {
 784                     qemu_system_shutdown_request();
 785                 } else {
 786                     QObject *data;
 787
 788                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 789                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 790                     qobject_decref(data);
 791                     vm_stop(RUN_STATE_GUEST_PANICKED);
 792                 }
 793             }
 794             r = EXCP_HALTED;
 795             break;
 796         case ICPT_CPU_STOP:
 797             if (s390_del_running_cpu(cpu) == 0) {
 798                 qemu_system_shutdown_request();
 799             }
 800             r = EXCP_HALTED;
 801             break;
 802         case ICPT_SOFT_INTERCEPT:
 803             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 804             exit(1);
 805             break;
 806         case ICPT_IO:
 807             fprintf(stderr, "KVM unimplemented icpt IO\n");
 808             exit(1);
 809             break;
 810         default:
 811             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 812             exit(1);
 813             break;
 814     }
 815
 816     return r;
 817 }
 818
 819 static int handle_tsch(S390CPU *cpu)
 820 {
 821     CPUS390XState *env = &cpu->env;
 822     CPUState *cs = CPU(cpu);
 823     struct kvm_run *run = cs->kvm_run;
 824     int ret;
 825
 826     kvm_s390_get_registers_partial(cs);
 827     cs->kvm_vcpu_dirty = true;
 828
 829     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 830     if (ret >= 0) {
 831         /* Success; set condition code. */
 832         setcc(cpu, ret);
 833         ret = 0;
 834     } else if (ret < -1) {
 835         /*
 836          * Failure.
 837          * If an I/O interrupt had been dequeued, we have to reinject it.
 838          */
 839         if (run->s390_tsch.dequeued) {
 840             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 841             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 842             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 843             uint32_t io_int_word = run->s390_tsch.io_int_word;
 844             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 845                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 846
 847             kvm_s390_interrupt_internal(cpu, type,
 848                                         ((uint32_t)subchannel_id << 16)
 849                                         | subchannel_nr,
 850                                         ((uint64_t)io_int_parm << 32)
 851                                         | io_int_word, 1);
 852         }
 853         ret = 0;
 854     }
 855     return ret;
 856 }
 857
 858 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 859 {
 860     S390CPU *cpu = S390_CPU(cs);
 861     int ret = 0;
 862
 863     switch (run->exit_reason) {
 864         case KVM_EXIT_S390_SIEIC:
 865             ret = handle_intercept(cpu);
 866             break;
 867         case KVM_EXIT_S390_RESET:
 868             qemu_system_reset_request();
 869             break;
 870         case KVM_EXIT_S390_TSCH:
 871             ret = handle_tsch(cpu);
 872             break;
 873         default:
 874             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 875             break;
 876     }
 877
 878     if (ret == 0) {
 879         ret = EXCP_INTERRUPT;
 880     }
 881     return ret;
 882 }
 883
 884 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 885 {
 886     return true;
 887 }
 888
 889 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 890 {
 891     return 1;
 892 }
 893
 894 int kvm_arch_on_sigbus(int code, void *addr)
 895 {
 896     return 1;
 897 }
 898
 899 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 900                            uint16_t subchannel_nr, uint32_t io_int_parm,
 901                            uint32_t io_int_word)
 902 {
 903     uint32_t type;
 904
 905     type = ((subchannel_id & 0xff00) << 24) |
 906         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 907     kvm_s390_interrupt_internal(cpu, type,
 908                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 909                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 910 }
 911
 912 void kvm_s390_crw_mchk(S390CPU *cpu)
 913 {
 914     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 915                                 0x00400f1d40330000, 1);
 916 }
 917
 918 void kvm_s390_enable_css_support(S390CPU *cpu)
 919 {
 920     struct kvm_enable_cap cap = {};
 921     int r;
 922
 923     /* Activate host kernel channel subsystem support. */
 924     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 925     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 926     assert(r == 0);
 927 }
 928
 929 void kvm_arch_init_irq_routing(KVMState *s)
 930 {
 931 }
 932
 933 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 934                                     int vq, bool assign)
 935 {
 936     struct kvm_ioeventfd kick = {
 937         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 938         KVM_IOEVENTFD_FLAG_DATAMATCH,
 939         .fd = event_notifier_get_fd(notifier),
 940         .datamatch = vq,
 941         .addr = sch,
 942         .len = 8,
 943     };
 944     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 945         return -ENOSYS;
 946     }
 947     if (!assign) {
 948         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 949     }
 950     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 951 }