target-s390x/kvm.c

   1 /*
   2  * QEMU S390x KVM implementation
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  * Copyright IBM Corp. 2012
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * Contributions after 2012-10-29 are licensed under the terms of the
  18  * GNU GPL, version 2 or (at your option) any later version.
  19  *
  20  * You should have received a copy of the GNU (Lesser) General Public
  21  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/mman.h>
  27
  28 #include <linux/kvm.h>
  29 #include <asm/ptrace.h>
  30
  31 #include "qemu-common.h"
  32 #include "qemu/timer.h"
  33 #include "sysemu/sysemu.h"
  34 #include "sysemu/kvm.h"
  35 #include "cpu.h"
  36 #include "sysemu/device_tree.h"
  37 #include "qapi/qmp/qjson.h"
  38 #include "monitor/monitor.h"
  39
  40 /* #define DEBUG_KVM */
  41
  42 #ifdef DEBUG_KVM
  43 #define DPRINTF(fmt, ...) \
  44     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  45 #else
  46 #define DPRINTF(fmt, ...) \
  47     do { } while (0)
  48 #endif
  49
  50 #define IPA0_DIAG                       0x8300
  51 #define IPA0_SIGP                       0xae00
  52 #define IPA0_B2                         0xb200
  53 #define IPA0_B9                         0xb900
  54 #define IPA0_EB                         0xeb00
  55
  56 #define PRIV_SCLP_CALL                  0x20
  57 #define PRIV_CSCH                       0x30
  58 #define PRIV_HSCH                       0x31
  59 #define PRIV_MSCH                       0x32
  60 #define PRIV_SSCH                       0x33
  61 #define PRIV_STSCH                      0x34
  62 #define PRIV_TSCH                       0x35
  63 #define PRIV_TPI                        0x36
  64 #define PRIV_SAL                        0x37
  65 #define PRIV_RSCH                       0x38
  66 #define PRIV_STCRW                      0x39
  67 #define PRIV_STCPS                      0x3a
  68 #define PRIV_RCHP                       0x3b
  69 #define PRIV_SCHM                       0x3c
  70 #define PRIV_CHSC                       0x5f
  71 #define PRIV_SIGA                       0x74
  72 #define PRIV_XSCH                       0x76
  73 #define PRIV_SQBS                       0x8a
  74 #define PRIV_EQBS                       0x9c
  75 #define DIAG_IPL                        0x308
  76 #define DIAG_KVM_HYPERCALL              0x500
  77 #define DIAG_KVM_BREAKPOINT             0x501
  78
  79 #define ICPT_INSTRUCTION                0x04
  80 #define ICPT_WAITPSW                    0x1c
  81 #define ICPT_SOFT_INTERCEPT             0x24
  82 #define ICPT_CPU_STOP                   0x28
  83 #define ICPT_IO                         0x40
  84
  85 #define SIGP_RESTART                    0x06
  86 #define SIGP_INITIAL_CPU_RESET          0x0b
  87 #define SIGP_STORE_STATUS_ADDR          0x0e
  88 #define SIGP_SET_ARCH                   0x12
  89
  90 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  91     KVM_CAP_LAST_INFO
  92 };
  93
  94 static int cap_sync_regs;
  95
  96 int kvm_arch_init(KVMState *s)
  97 {
  98     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  99     return 0;
 100 }
 101
 102 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 103 {
 104     return cpu->cpu_index;
 105 }
 106
 107 int kvm_arch_init_vcpu(CPUState *cpu)
 108 {
 109     /* nothing todo yet */
 110     return 0;
 111 }
 112
 113 void kvm_arch_reset_vcpu(CPUState *cpu)
 114 {
 115     /* The initial reset call is needed here to reset in-kernel
 116      * vcpu data that we can't access directly from QEMU
 117      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
 118      * Before this ioctl cpu_synchronize_state() is called in common kvm
 119      * code (kvm-all) */
 120     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
 121         perror("Can't reset vcpu\n");
 122     }
 123 }
 124
 125 int kvm_arch_put_registers(CPUState *cs, int level)
 126 {
 127     S390CPU *cpu = S390_CPU(cs);
 128     CPUS390XState *env = &cpu->env;
 129     struct kvm_one_reg reg;
 130     struct kvm_sregs sregs;
 131     struct kvm_regs regs;
 132     int ret;
 133     int i;
 134
 135     /* always save the PSW  and the GPRS*/
 136     cs->kvm_run->psw_addr = env->psw.addr;
 137     cs->kvm_run->psw_mask = env->psw.mask;
 138
 139     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 140         for (i = 0; i < 16; i++) {
 141             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 142             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 143         }
 144     } else {
 145         for (i = 0; i < 16; i++) {
 146             regs.gprs[i] = env->regs[i];
 147         }
 148         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 149         if (ret < 0) {
 150             return ret;
 151         }
 152     }
 153
 154     if (env->runtime_reg_dirty_mask == KVM_S390_RUNTIME_DIRTY_FULL) {
 155         reg.id = KVM_REG_S390_CPU_TIMER;
 156         reg.addr = (__u64)&(env->cputm);
 157         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 158         if (ret < 0) {
 159             return ret;
 160         }
 161
 162         reg.id = KVM_REG_S390_CLOCK_COMP;
 163         reg.addr = (__u64)&(env->ckc);
 164         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 165         if (ret < 0) {
 166             return ret;
 167         }
 168
 169         reg.id = KVM_REG_S390_TODPR;
 170         reg.addr = (__u64)&(env->todpr);
 171         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 172         if (ret < 0) {
 173             return ret;
 174         }
 175     }
 176     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_NONE;
 177
 178     /* Do we need to save more than that? */
 179     if (level == KVM_PUT_RUNTIME_STATE) {
 180         return 0;
 181     }
 182
 183     if (cap_sync_regs &&
 184         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 185         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 186         for (i = 0; i < 16; i++) {
 187             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 188             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 189         }
 190         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 191         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 192     } else {
 193         for (i = 0; i < 16; i++) {
 194             sregs.acrs[i] = env->aregs[i];
 195             sregs.crs[i] = env->cregs[i];
 196         }
 197         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 198         if (ret < 0) {
 199             return ret;
 200         }
 201     }
 202
 203     /* Finally the prefix */
 204     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 205         cs->kvm_run->s.regs.prefix = env->psa;
 206         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 207     } else {
 208         /* prefix is only supported via sync regs */
 209     }
 210     return 0;
 211 }
 212
 213 int kvm_arch_get_registers(CPUState *cs)
 214 {
 215     S390CPU *cpu = S390_CPU(cs);
 216     CPUS390XState *env = &cpu->env;
 217     struct kvm_one_reg reg;
 218     int r;
 219
 220     r = kvm_s390_get_registers_partial(cs);
 221     if (r < 0) {
 222         return r;
 223     }
 224
 225     reg.id = KVM_REG_S390_CPU_TIMER;
 226     reg.addr = (__u64)&(env->cputm);
 227     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 228     if (r < 0) {
 229         return r;
 230     }
 231
 232     reg.id = KVM_REG_S390_CLOCK_COMP;
 233     reg.addr = (__u64)&(env->ckc);
 234     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 235     if (r < 0) {
 236         return r;
 237     }
 238
 239     reg.id = KVM_REG_S390_TODPR;
 240     reg.addr = (__u64)&(env->todpr);
 241     r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 242     if (r < 0) {
 243         return r;
 244     }
 245
 246     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_FULL;
 247     return 0;
 248 }
 249
 250 int kvm_s390_get_registers_partial(CPUState *cs)
 251 {
 252     S390CPU *cpu = S390_CPU(cs);
 253     CPUS390XState *env = &cpu->env;
 254     struct kvm_sregs sregs;
 255     struct kvm_regs regs;
 256     int ret;
 257     int i;
 258
 259     if (env->runtime_reg_dirty_mask) {
 260         return 0;
 261     }
 262
 263     /* get the PSW */
 264     env->psw.addr = cs->kvm_run->psw_addr;
 265     env->psw.mask = cs->kvm_run->psw_mask;
 266
 267     /* the GPRS */
 268     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 269         for (i = 0; i < 16; i++) {
 270             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 271         }
 272     } else {
 273         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 274         if (ret < 0) {
 275             return ret;
 276         }
 277          for (i = 0; i < 16; i++) {
 278             env->regs[i] = regs.gprs[i];
 279         }
 280     }
 281
 282     /* The ACRS and CRS */
 283     if (cap_sync_regs &&
 284         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 285         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 286         for (i = 0; i < 16; i++) {
 287             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 288             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 289         }
 290     } else {
 291         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 292         if (ret < 0) {
 293             return ret;
 294         }
 295          for (i = 0; i < 16; i++) {
 296             env->aregs[i] = sregs.acrs[i];
 297             env->cregs[i] = sregs.crs[i];
 298         }
 299     }
 300
 301     /* Finally the prefix */
 302     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 303         env->psa = cs->kvm_run->s.regs.prefix;
 304     } else {
 305         /* no prefix without sync regs */
 306     }
 307
 308     env->runtime_reg_dirty_mask = KVM_S390_RUNTIME_DIRTY_PARTIAL;
 309     return 0;
 310 }
 311
 312 /*
 313  * Legacy layout for s390:
 314  * Older S390 KVM requires the topmost vma of the RAM to be
 315  * smaller than an system defined value, which is at least 256GB.
 316  * Larger systems have larger values. We put the guest between
 317  * the end of data segment (system break) and this value. We
 318  * use 32GB as a base to have enough room for the system break
 319  * to grow. We also have to use MAP parameters that avoid
 320  * read-only mapping of guest pages.
 321  */
 322 static void *legacy_s390_alloc(ram_addr_t size)
 323 {
 324     void *mem;
 325
 326     mem = mmap((void *) 0x800000000ULL, size,
 327                PROT_EXEC|PROT_READ|PROT_WRITE,
 328                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 329     if (mem == MAP_FAILED) {
 330         fprintf(stderr, "Allocating RAM failed\n");
 331         abort();
 332     }
 333     return mem;
 334 }
 335
 336 void *kvm_arch_ram_alloc(ram_addr_t size)
 337 {
 338     /* Can we use the standard allocation ? */
 339     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 340         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 341         return NULL;
 342     } else {
 343         return legacy_s390_alloc(size);
 344     }
 345 }
 346
 347 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 348 {
 349     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 350
 351     if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 352         cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 353         return -EINVAL;
 354     }
 355     return 0;
 356 }
 357
 358 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 359 {
 360     uint8_t t[4];
 361     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 362
 363     if (cpu_memory_rw_debug(cs, bp->pc, t, 4, 0)) {
 364         return -EINVAL;
 365     } else if (memcmp(t, diag_501, 4)) {
 366         return -EINVAL;
 367     } else if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 368         return -EINVAL;
 369     }
 370
 371     return 0;
 372 }
 373
 374 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 375 {
 376 }
 377
 378 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 379 {
 380 }
 381
 382 int kvm_arch_process_async_events(CPUState *cs)
 383 {
 384     return cs->halted;
 385 }
 386
 387 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 388                                  uint64_t parm64, int vm)
 389 {
 390     CPUState *cs = CPU(cpu);
 391     struct kvm_s390_interrupt kvmint;
 392     int r;
 393
 394     if (!cs->kvm_state) {
 395         return;
 396     }
 397
 398     kvmint.type = type;
 399     kvmint.parm = parm;
 400     kvmint.parm64 = parm64;
 401
 402     if (vm) {
 403         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 404     } else {
 405         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 406     }
 407
 408     if (r < 0) {
 409         fprintf(stderr, "KVM failed to inject interrupt\n");
 410         exit(1);
 411     }
 412 }
 413
 414 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 415 {
 416     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 417                                 token, 1);
 418 }
 419
 420 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 421 {
 422     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 423 }
 424
 425 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 426 {
 427     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 428 }
 429
 430 static inline void setcc(S390CPU *cpu, uint64_t cc)
 431 {
 432     CPUS390XState *env = &cpu->env;
 433     CPUState *cs = CPU(cpu);
 434
 435     cs->kvm_run->psw_mask &= ~(3ull << 44);
 436     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 437
 438     env->psw.mask &= ~(3ul << 44);
 439     env->psw.mask |= (cc & 3) << 44;
 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     uint32_t sccb;
 447     uint64_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(sccb, code);
 455     if (r < 0) {
 456         enter_pgmcheck(cpu, -r);
 457     }
 458     setcc(cpu, r);
 459
 460     return 0;
 461 }
 462
 463 static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,
 464                                uint8_t ipa0, uint8_t ipa1, uint8_t ipb)
 465 {
 466     int r = 0;
 467     int no_cc = 0;
 468     CPUS390XState *env = &cpu->env;
 469     CPUState *cs = CPU(cpu);
 470
 471     if (ipa0 != 0xb2) {
 472         /* Not handled for now. */
 473         return -1;
 474     }
 475
 476     kvm_s390_get_registers_partial(cs);
 477     cs->kvm_vcpu_dirty = true;
 478
 479     switch (ipa1) {
 480     case PRIV_XSCH:
 481         r = ioinst_handle_xsch(env, env->regs[1]);
 482         break;
 483     case PRIV_CSCH:
 484         r = ioinst_handle_csch(env, env->regs[1]);
 485         break;
 486     case PRIV_HSCH:
 487         r = ioinst_handle_hsch(env, env->regs[1]);
 488         break;
 489     case PRIV_MSCH:
 490         r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);
 491         break;
 492     case PRIV_SSCH:
 493         r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);
 494         break;
 495     case PRIV_STCRW:
 496         r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);
 497         break;
 498     case PRIV_STSCH:
 499         r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);
 500         break;
 501     case PRIV_TSCH:
 502         /* We should only get tsch via KVM_EXIT_S390_TSCH. */
 503         fprintf(stderr, "Spurious tsch intercept\n");
 504         break;
 505     case PRIV_CHSC:
 506         r = ioinst_handle_chsc(env, run->s390_sieic.ipb);
 507         break;
 508     case PRIV_TPI:
 509         /* This should have been handled by kvm already. */
 510         fprintf(stderr, "Spurious tpi intercept\n");
 511         break;
 512     case PRIV_SCHM:
 513         no_cc = 1;
 514         r = ioinst_handle_schm(env, env->regs[1], env->regs[2],
 515                                run->s390_sieic.ipb);
 516         break;
 517     case PRIV_RSCH:
 518         r = ioinst_handle_rsch(env, env->regs[1]);
 519         break;
 520     case PRIV_RCHP:
 521         r = ioinst_handle_rchp(env, env->regs[1]);
 522         break;
 523     case PRIV_STCPS:
 524         /* We do not provide this instruction, it is suppressed. */
 525         no_cc = 1;
 526         r = 0;
 527         break;
 528     case PRIV_SAL:
 529         no_cc = 1;
 530         r = ioinst_handle_sal(env, env->regs[1]);
 531         break;
 532     case PRIV_SIGA:
 533         /* Not provided, set CC = 3 for subchannel not operational */
 534         r = 3;
 535         break;
 536     default:
 537         return -1;
 538     }
 539
 540     if (r >= 0 && !no_cc) {
 541         setcc(cpu, r);
 542     }
 543
 544     return 0;
 545 }
 546
 547 static int handle_priv(S390CPU *cpu, struct kvm_run *run,
 548                        uint8_t ipa0, uint8_t ipa1)
 549 {
 550     int r = 0;
 551     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 552     uint8_t ipb = run->s390_sieic.ipb & 0xff;
 553
 554     DPRINTF("KVM: PRIV: %d\n", ipa1);
 555     switch (ipa1) {
 556         case PRIV_SCLP_CALL:
 557             r = kvm_sclp_service_call(cpu, run, ipbh0);
 558             break;
 559         default:
 560             r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);
 561             if (r == -1) {
 562                 DPRINTF("KVM: unhandled PRIV: 0x%x\n", ipa1);
 563             }
 564             break;
 565     }
 566
 567     return r;
 568 }
 569
 570 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 571 {
 572     CPUState *cs = CPU(cpu);
 573     CPUS390XState *env = &cpu->env;
 574
 575     kvm_s390_get_registers_partial(cs);
 576     cs->kvm_vcpu_dirty = true;
 577     env->regs[2] = s390_virtio_hypercall(env);
 578
 579     return 0;
 580 }
 581
 582 static void kvm_handle_diag_308(S390CPU *cpu, struct kvm_run *run)
 583 {
 584     uint64_t r1, r3;
 585
 586     cpu_synchronize_state(CPU(cpu));
 587     r1 = (run->s390_sieic.ipa & 0x00f0) >> 8;
 588     r3 = run->s390_sieic.ipa & 0x000f;
 589     handle_diag_308(&cpu->env, r1, r3);
 590 }
 591
 592 static int handle_diag(S390CPU *cpu, struct kvm_run *run, int ipb_code)
 593 {
 594     int r = 0;
 595
 596     switch (ipb_code) {
 597     case DIAG_IPL:
 598         kvm_handle_diag_308(cpu, run);
 599         break;
 600     case DIAG_KVM_HYPERCALL:
 601         r = handle_hypercall(cpu, run);
 602         break;
 603     case DIAG_KVM_BREAKPOINT:
 604         sleep(10);
 605         break;
 606     default:
 607         DPRINTF("KVM: unknown DIAG: 0x%x\n", ipb_code);
 608         r = -1;
 609         break;
 610     }
 611
 612     return r;
 613 }
 614
 615 int kvm_s390_cpu_restart(S390CPU *cpu)
 616 {
 617     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 618     s390_add_running_cpu(cpu);
 619     qemu_cpu_kick(CPU(cpu));
 620     DPRINTF("DONE: KVM cpu restart: %p\n", &cpu->env);
 621     return 0;
 622 }
 623
 624 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 625 {
 626     /* XXX */
 627     fprintf(stderr, "XXX SIGP store status\n");
 628     return -1;
 629 }
 630
 631 static int s390_cpu_initial_reset(S390CPU *cpu)
 632 {
 633     CPUState *cs = CPU(cpu);
 634     CPUS390XState *env = &cpu->env;
 635     int i;
 636
 637     s390_del_running_cpu(cpu);
 638     if (kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL) < 0) {
 639         perror("cannot init reset vcpu");
 640     }
 641
 642     /* Manually zero out all registers */
 643     cpu_synchronize_state(cs);
 644     for (i = 0; i < 16; i++) {
 645         env->regs[i] = 0;
 646     }
 647
 648     DPRINTF("DONE: SIGP initial reset: %p\n", env);
 649     return 0;
 650 }
 651
 652 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 653 {
 654     CPUS390XState *env = &cpu->env;
 655     uint8_t order_code;
 656     uint32_t parameter;
 657     uint16_t cpu_addr;
 658     uint8_t t;
 659     int r = -1;
 660     S390CPU *target_cpu;
 661     CPUS390XState *target_env;
 662
 663     cpu_synchronize_state(CPU(cpu));
 664
 665     /* get order code */
 666     order_code = run->s390_sieic.ipb >> 28;
 667     if (order_code > 0) {
 668         order_code = env->regs[order_code];
 669     }
 670     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 671
 672     /* get parameters */
 673     t = (ipa1 & 0xf0) >> 4;
 674     if (!(t % 2)) {
 675         t++;
 676     }
 677
 678     parameter = env->regs[t] & 0x7ffffe00;
 679     cpu_addr = env->regs[ipa1 & 0x0f];
 680
 681     target_cpu = s390_cpu_addr2state(cpu_addr);
 682     if (target_cpu == NULL) {
 683         goto out;
 684     }
 685     target_env = &target_cpu->env;
 686
 687     switch (order_code) {
 688         case SIGP_RESTART:
 689             r = kvm_s390_cpu_restart(target_cpu);
 690             break;
 691         case SIGP_STORE_STATUS_ADDR:
 692             r = s390_store_status(target_env, parameter);
 693             break;
 694         case SIGP_SET_ARCH:
 695             /* make the caller panic */
 696             return -1;
 697         case SIGP_INITIAL_CPU_RESET:
 698             r = s390_cpu_initial_reset(target_cpu);
 699             break;
 700         default:
 701             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 702             break;
 703     }
 704
 705 out:
 706     setcc(cpu, r ? 3 : 0);
 707     return 0;
 708 }
 709
 710 static void handle_instruction(S390CPU *cpu, struct kvm_run *run)
 711 {
 712     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 713     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 714     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 715     int r = -1;
 716
 717     DPRINTF("handle_instruction 0x%x 0x%x\n",
 718             run->s390_sieic.ipa, run->s390_sieic.ipb);
 719     switch (ipa0) {
 720     case IPA0_B2:
 721     case IPA0_B9:
 722     case IPA0_EB:
 723         r = handle_priv(cpu, run, ipa0 >> 8, ipa1);
 724         break;
 725     case IPA0_DIAG:
 726         r = handle_diag(cpu, run, ipb_code);
 727         break;
 728     case IPA0_SIGP:
 729         r = handle_sigp(cpu, run, ipa1);
 730         break;
 731     }
 732
 733     if (r < 0) {
 734         enter_pgmcheck(cpu, 0x0001);
 735     }
 736 }
 737
 738 static bool is_special_wait_psw(CPUState *cs)
 739 {
 740     /* signal quiesce */
 741     return cs->kvm_run->psw_addr == 0xfffUL;
 742 }
 743
 744 static int handle_intercept(S390CPU *cpu)
 745 {
 746     CPUState *cs = CPU(cpu);
 747     struct kvm_run *run = cs->kvm_run;
 748     int icpt_code = run->s390_sieic.icptcode;
 749     int r = 0;
 750
 751     DPRINTF("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 752             (long)cs->kvm_run->psw_addr);
 753     switch (icpt_code) {
 754         case ICPT_INSTRUCTION:
 755             handle_instruction(cpu, run);
 756             break;
 757         case ICPT_WAITPSW:
 758             /* disabled wait, since enabled wait is handled in kernel */
 759             if (s390_del_running_cpu(cpu) == 0) {
 760                 if (is_special_wait_psw(cs)) {
 761                     qemu_system_shutdown_request();
 762                 } else {
 763                     QObject *data;
 764
 765                     data = qobject_from_jsonf("{ 'action': %s }", "pause");
 766                     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
 767                     qobject_decref(data);
 768                     vm_stop(RUN_STATE_GUEST_PANICKED);
 769                 }
 770             }
 771             r = EXCP_HALTED;
 772             break;
 773         case ICPT_CPU_STOP:
 774             if (s390_del_running_cpu(cpu) == 0) {
 775                 qemu_system_shutdown_request();
 776             }
 777             r = EXCP_HALTED;
 778             break;
 779         case ICPT_SOFT_INTERCEPT:
 780             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 781             exit(1);
 782             break;
 783         case ICPT_IO:
 784             fprintf(stderr, "KVM unimplemented icpt IO\n");
 785             exit(1);
 786             break;
 787         default:
 788             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 789             exit(1);
 790             break;
 791     }
 792
 793     return r;
 794 }
 795
 796 static int handle_tsch(S390CPU *cpu)
 797 {
 798     CPUS390XState *env = &cpu->env;
 799     CPUState *cs = CPU(cpu);
 800     struct kvm_run *run = cs->kvm_run;
 801     int ret;
 802
 803     kvm_s390_get_registers_partial(cs);
 804     cs->kvm_vcpu_dirty = true;
 805
 806     ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);
 807     if (ret >= 0) {
 808         /* Success; set condition code. */
 809         setcc(cpu, ret);
 810         ret = 0;
 811     } else if (ret < -1) {
 812         /*
 813          * Failure.
 814          * If an I/O interrupt had been dequeued, we have to reinject it.
 815          */
 816         if (run->s390_tsch.dequeued) {
 817             uint16_t subchannel_id = run->s390_tsch.subchannel_id;
 818             uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;
 819             uint32_t io_int_parm = run->s390_tsch.io_int_parm;
 820             uint32_t io_int_word = run->s390_tsch.io_int_word;
 821             uint32_t type = ((subchannel_id & 0xff00) << 24) |
 822                 ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 823
 824             kvm_s390_interrupt_internal(cpu, type,
 825                                         ((uint32_t)subchannel_id << 16)
 826                                         | subchannel_nr,
 827                                         ((uint64_t)io_int_parm << 32)
 828                                         | io_int_word, 1);
 829         }
 830         ret = 0;
 831     }
 832     return ret;
 833 }
 834
 835 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 836 {
 837     S390CPU *cpu = S390_CPU(cs);
 838     int ret = 0;
 839
 840     switch (run->exit_reason) {
 841         case KVM_EXIT_S390_SIEIC:
 842             ret = handle_intercept(cpu);
 843             break;
 844         case KVM_EXIT_S390_RESET:
 845             qemu_system_reset_request();
 846             break;
 847         case KVM_EXIT_S390_TSCH:
 848             ret = handle_tsch(cpu);
 849             break;
 850         default:
 851             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 852             break;
 853     }
 854
 855     if (ret == 0) {
 856         ret = EXCP_INTERRUPT;
 857     }
 858     return ret;
 859 }
 860
 861 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 862 {
 863     return true;
 864 }
 865
 866 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 867 {
 868     return 1;
 869 }
 870
 871 int kvm_arch_on_sigbus(int code, void *addr)
 872 {
 873     return 1;
 874 }
 875
 876 void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,
 877                            uint16_t subchannel_nr, uint32_t io_int_parm,
 878                            uint32_t io_int_word)
 879 {
 880     uint32_t type;
 881
 882     type = ((subchannel_id & 0xff00) << 24) |
 883         ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);
 884     kvm_s390_interrupt_internal(cpu, type,
 885                                 ((uint32_t)subchannel_id << 16) | subchannel_nr,
 886                                 ((uint64_t)io_int_parm << 32) | io_int_word, 1);
 887 }
 888
 889 void kvm_s390_crw_mchk(S390CPU *cpu)
 890 {
 891     kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,
 892                                 0x00400f1d40330000, 1);
 893 }
 894
 895 void kvm_s390_enable_css_support(S390CPU *cpu)
 896 {
 897     struct kvm_enable_cap cap = {};
 898     int r;
 899
 900     /* Activate host kernel channel subsystem support. */
 901     cap.cap = KVM_CAP_S390_CSS_SUPPORT;
 902     r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);
 903     assert(r == 0);
 904 }
 905
 906 void kvm_arch_init_irq_routing(KVMState *s)
 907 {
 908 }
 909
 910 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
 911                                     int vq, bool assign)
 912 {
 913     struct kvm_ioeventfd kick = {
 914         .flags = KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY |
 915         KVM_IOEVENTFD_FLAG_DATAMATCH,
 916         .fd = event_notifier_get_fd(notifier),
 917         .datamatch = vq,
 918         .addr = sch,
 919         .len = 8,
 920     };
 921     if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
 922         return -ENOSYS;
 923     }
 924     if (!assign) {
 925         kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
 926     }
 927     return kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
 928 }