target-s390x/kvm.c

   1 /*
   2  * QEMU S390x KVM implementation
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/mman.h>
  23
  24 #include <linux/kvm.h>
  25 #include <asm/ptrace.h>
  26
  27 #include "qemu-common.h"
  28 #include "qemu-timer.h"
  29 #include "sysemu.h"
  30 #include "kvm.h"
  31 #include "cpu.h"
  32 #include "device_tree.h"
  33
  34 /* #define DEBUG_KVM */
  35
  36 #ifdef DEBUG_KVM
  37 #define dprintf(fmt, ...) \
  38     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  39 #else
  40 #define dprintf(fmt, ...) \
  41     do { } while (0)
  42 #endif
  43
  44 #define IPA0_DIAG                       0x8300
  45 #define IPA0_SIGP                       0xae00
  46 #define IPA0_PRIV                       0xb200
  47
  48 #define PRIV_SCLP_CALL                  0x20
  49 #define DIAG_KVM_HYPERCALL              0x500
  50 #define DIAG_KVM_BREAKPOINT             0x501
  51
  52 #define ICPT_INSTRUCTION                0x04
  53 #define ICPT_WAITPSW                    0x1c
  54 #define ICPT_SOFT_INTERCEPT             0x24
  55 #define ICPT_CPU_STOP                   0x28
  56 #define ICPT_IO                         0x40
  57
  58 #define SIGP_RESTART                    0x06
  59 #define SIGP_INITIAL_CPU_RESET          0x0b
  60 #define SIGP_STORE_STATUS_ADDR          0x0e
  61 #define SIGP_SET_ARCH                   0x12
  62
  63 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  64     KVM_CAP_LAST_INFO
  65 };
  66
  67 static int cap_sync_regs;
  68
  69 int kvm_arch_init(KVMState *s)
  70 {
  71     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  72     return 0;
  73 }
  74
  75 int kvm_arch_init_vcpu(CPUState *cpu)
  76 {
  77     int ret = 0;
  78
  79     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
  80         perror("cannot init reset vcpu");
  81     }
  82
  83     return ret;
  84 }
  85
  86 void kvm_arch_reset_vcpu(CPUState *cpu)
  87 {
  88     /* FIXME: add code to reset vcpu. */
  89 }
  90
  91 int kvm_arch_put_registers(CPUState *cs, int level)
  92 {
  93     S390CPU *cpu = S390_CPU(cs);
  94     CPUS390XState *env = &cpu->env;
  95     struct kvm_sregs sregs;
  96     struct kvm_regs regs;
  97     int ret;
  98     int i;
  99
 100     /* always save the PSW  and the GPRS*/
 101     env->kvm_run->psw_addr = env->psw.addr;
 102     env->kvm_run->psw_mask = env->psw.mask;
 103
 104     if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 105         for (i = 0; i < 16; i++) {
 106             env->kvm_run->s.regs.gprs[i] = env->regs[i];
 107             env->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 108         }
 109     } else {
 110         for (i = 0; i < 16; i++) {
 111             regs.gprs[i] = env->regs[i];
 112         }
 113         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 114         if (ret < 0) {
 115             return ret;
 116         }
 117     }
 118
 119     /* Do we need to save more than that? */
 120     if (level == KVM_PUT_RUNTIME_STATE) {
 121         return 0;
 122     }
 123
 124     if (cap_sync_regs &&
 125         env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 126         env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 127         for (i = 0; i < 16; i++) {
 128             env->kvm_run->s.regs.acrs[i] = env->aregs[i];
 129             env->kvm_run->s.regs.crs[i] = env->cregs[i];
 130         }
 131         env->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 132         env->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 133     } else {
 134         for (i = 0; i < 16; i++) {
 135             sregs.acrs[i] = env->aregs[i];
 136             sregs.crs[i] = env->cregs[i];
 137         }
 138         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 139         if (ret < 0) {
 140             return ret;
 141         }
 142     }
 143
 144     /* Finally the prefix */
 145     if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 146         env->kvm_run->s.regs.prefix = env->psa;
 147         env->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 148     } else {
 149         /* prefix is only supported via sync regs */
 150     }
 151     return 0;
 152 }
 153
 154 int kvm_arch_get_registers(CPUState *cs)
 155 {
 156     S390CPU *cpu = S390_CPU(cs);
 157     CPUS390XState *env = &cpu->env;
 158     struct kvm_sregs sregs;
 159     struct kvm_regs regs;
 160     int ret;
 161     int i;
 162
 163     /* get the PSW */
 164     env->psw.addr = env->kvm_run->psw_addr;
 165     env->psw.mask = env->kvm_run->psw_mask;
 166
 167     /* the GPRS */
 168     if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 169         for (i = 0; i < 16; i++) {
 170             env->regs[i] = env->kvm_run->s.regs.gprs[i];
 171         }
 172     } else {
 173         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 174         if (ret < 0) {
 175             return ret;
 176         }
 177          for (i = 0; i < 16; i++) {
 178             env->regs[i] = regs.gprs[i];
 179         }
 180     }
 181
 182     /* The ACRS and CRS */
 183     if (cap_sync_regs &&
 184         env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 185         env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 186         for (i = 0; i < 16; i++) {
 187             env->aregs[i] = env->kvm_run->s.regs.acrs[i];
 188             env->cregs[i] = env->kvm_run->s.regs.crs[i];
 189         }
 190     } else {
 191         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 192         if (ret < 0) {
 193             return ret;
 194         }
 195          for (i = 0; i < 16; i++) {
 196             env->aregs[i] = sregs.acrs[i];
 197             env->cregs[i] = sregs.crs[i];
 198         }
 199     }
 200
 201     /* Finally the prefix */
 202     if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 203         env->psa = env->kvm_run->s.regs.prefix;
 204     } else {
 205         /* no prefix without sync regs */
 206     }
 207
 208     return 0;
 209 }
 210
 211 /*
 212  * Legacy layout for s390:
 213  * Older S390 KVM requires the topmost vma of the RAM to be
 214  * smaller than an system defined value, which is at least 256GB.
 215  * Larger systems have larger values. We put the guest between
 216  * the end of data segment (system break) and this value. We
 217  * use 32GB as a base to have enough room for the system break
 218  * to grow. We also have to use MAP parameters that avoid
 219  * read-only mapping of guest pages.
 220  */
 221 static void *legacy_s390_alloc(ram_addr_t size)
 222 {
 223     void *mem;
 224
 225     mem = mmap((void *) 0x800000000ULL, size,
 226                PROT_EXEC|PROT_READ|PROT_WRITE,
 227                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 228     if (mem == MAP_FAILED) {
 229         fprintf(stderr, "Allocating RAM failed\n");
 230         abort();
 231     }
 232     return mem;
 233 }
 234
 235 void *kvm_arch_vmalloc(ram_addr_t size)
 236 {
 237     /* Can we use the standard allocation ? */
 238     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 239         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 240         return NULL;
 241     } else {
 242         return legacy_s390_alloc(size);
 243     }
 244 }
 245
 246 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 247 {
 248     S390CPU *cpu = S390_CPU(cs);
 249     CPUS390XState *env = &cpu->env;
 250     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 251
 252     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 253         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 254         return -EINVAL;
 255     }
 256     return 0;
 257 }
 258
 259 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 260 {
 261     S390CPU *cpu = S390_CPU(cs);
 262     CPUS390XState *env = &cpu->env;
 263     uint8_t t[4];
 264     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 265
 266     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 267         return -EINVAL;
 268     } else if (memcmp(t, diag_501, 4)) {
 269         return -EINVAL;
 270     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 271         return -EINVAL;
 272     }
 273
 274     return 0;
 275 }
 276
 277 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 278 {
 279 }
 280
 281 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 282 {
 283 }
 284
 285 int kvm_arch_process_async_events(CPUState *cs)
 286 {
 287     S390CPU *cpu = S390_CPU(cs);
 288     return cpu->env.halted;
 289 }
 290
 291 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 292                                  uint64_t parm64, int vm)
 293 {
 294     CPUState *cs = CPU(cpu);
 295     struct kvm_s390_interrupt kvmint;
 296     int r;
 297
 298     if (!cs->kvm_state) {
 299         return;
 300     }
 301
 302     kvmint.type = type;
 303     kvmint.parm = parm;
 304     kvmint.parm64 = parm64;
 305
 306     if (vm) {
 307         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 308     } else {
 309         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 310     }
 311
 312     if (r < 0) {
 313         fprintf(stderr, "KVM failed to inject interrupt\n");
 314         exit(1);
 315     }
 316 }
 317
 318 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 319 {
 320     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 321                                 token, 1);
 322 }
 323
 324 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 325 {
 326     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 327 }
 328
 329 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 330 {
 331     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 332 }
 333
 334 static inline void setcc(CPUS390XState *env, uint64_t cc)
 335 {
 336     env->kvm_run->psw_mask &= ~(3ull << 44);
 337     env->kvm_run->psw_mask |= (cc & 3) << 44;
 338
 339     env->psw.mask &= ~(3ul << 44);
 340     env->psw.mask |= (cc & 3) << 44;
 341 }
 342
 343 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 344                                  uint16_t ipbh0)
 345 {
 346     CPUS390XState *env = &cpu->env;
 347     uint32_t sccb;
 348     uint64_t code;
 349     int r = 0;
 350
 351     cpu_synchronize_state(env);
 352     sccb = env->regs[ipbh0 & 0xf];
 353     code = env->regs[(ipbh0 & 0xf0) >> 4];
 354
 355     r = sclp_service_call(sccb, code);
 356     if (r < 0) {
 357         enter_pgmcheck(cpu, -r);
 358     }
 359     setcc(env, r);
 360
 361     return 0;
 362 }
 363
 364 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 365 {
 366     int r = 0;
 367     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 368
 369     dprintf("KVM: PRIV: %d\n", ipa1);
 370     switch (ipa1) {
 371         case PRIV_SCLP_CALL:
 372             r = kvm_sclp_service_call(cpu, run, ipbh0);
 373             break;
 374         default:
 375             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 376             r = -1;
 377             break;
 378     }
 379
 380     return r;
 381 }
 382
 383 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 384 {
 385     cpu_synchronize_state(env);
 386     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 387
 388     return 0;
 389 }
 390
 391 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 392 {
 393     int r = 0;
 394
 395     switch (ipb_code) {
 396         case DIAG_KVM_HYPERCALL:
 397             r = handle_hypercall(env, run);
 398             break;
 399         case DIAG_KVM_BREAKPOINT:
 400             sleep(10);
 401             break;
 402         default:
 403             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 404             r = -1;
 405             break;
 406     }
 407
 408     return r;
 409 }
 410
 411 static int s390_cpu_restart(S390CPU *cpu)
 412 {
 413     CPUS390XState *env = &cpu->env;
 414
 415     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 416     s390_add_running_cpu(env);
 417     qemu_cpu_kick(CPU(cpu));
 418     dprintf("DONE: SIGP cpu restart: %p\n", env);
 419     return 0;
 420 }
 421
 422 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 423 {
 424     /* XXX */
 425     fprintf(stderr, "XXX SIGP store status\n");
 426     return -1;
 427 }
 428
 429 static int s390_cpu_initial_reset(S390CPU *cpu)
 430 {
 431     CPUS390XState *env = &cpu->env;
 432     int i;
 433
 434     s390_del_running_cpu(env);
 435     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 436         perror("cannot init reset vcpu");
 437     }
 438
 439     /* Manually zero out all registers */
 440     cpu_synchronize_state(env);
 441     for (i = 0; i < 16; i++) {
 442         env->regs[i] = 0;
 443     }
 444
 445     dprintf("DONE: SIGP initial reset: %p\n", env);
 446     return 0;
 447 }
 448
 449 static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 450 {
 451     uint8_t order_code;
 452     uint32_t parameter;
 453     uint16_t cpu_addr;
 454     uint8_t t;
 455     int r = -1;
 456     S390CPU *target_cpu;
 457     CPUS390XState *target_env;
 458
 459     cpu_synchronize_state(env);
 460
 461     /* get order code */
 462     order_code = run->s390_sieic.ipb >> 28;
 463     if (order_code > 0) {
 464         order_code = env->regs[order_code];
 465     }
 466     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 467
 468     /* get parameters */
 469     t = (ipa1 & 0xf0) >> 4;
 470     if (!(t % 2)) {
 471         t++;
 472     }
 473
 474     parameter = env->regs[t] & 0x7ffffe00;
 475     cpu_addr = env->regs[ipa1 & 0x0f];
 476
 477     target_cpu = s390_cpu_addr2state(cpu_addr);
 478     if (target_cpu == NULL) {
 479         goto out;
 480     }
 481     target_env = &target_cpu->env;
 482
 483     switch (order_code) {
 484         case SIGP_RESTART:
 485             r = s390_cpu_restart(target_cpu);
 486             break;
 487         case SIGP_STORE_STATUS_ADDR:
 488             r = s390_store_status(target_env, parameter);
 489             break;
 490         case SIGP_SET_ARCH:
 491             /* make the caller panic */
 492             return -1;
 493         case SIGP_INITIAL_CPU_RESET:
 494             r = s390_cpu_initial_reset(target_cpu);
 495             break;
 496         default:
 497             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 498             break;
 499     }
 500
 501 out:
 502     setcc(env, r ? 3 : 0);
 503     return 0;
 504 }
 505
 506 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 507 {
 508     CPUS390XState *env = &cpu->env;
 509     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 510     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 511     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 512     int r = -1;
 513
 514     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 515     switch (ipa0) {
 516         case IPA0_PRIV:
 517             r = handle_priv(cpu, run, ipa1);
 518             break;
 519         case IPA0_DIAG:
 520             r = handle_diag(env, run, ipb_code);
 521             break;
 522         case IPA0_SIGP:
 523             r = handle_sigp(env, run, ipa1);
 524             break;
 525     }
 526
 527     if (r < 0) {
 528         enter_pgmcheck(cpu, 0x0001);
 529     }
 530     return 0;
 531 }
 532
 533 static bool is_special_wait_psw(CPUS390XState *env)
 534 {
 535     /* signal quiesce */
 536     return env->kvm_run->psw_addr == 0xfffUL;
 537 }
 538
 539 static int handle_intercept(S390CPU *cpu)
 540 {
 541     CPUS390XState *env = &cpu->env;
 542     struct kvm_run *run = env->kvm_run;
 543     int icpt_code = run->s390_sieic.icptcode;
 544     int r = 0;
 545
 546     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 547             (long)env->kvm_run->psw_addr);
 548     switch (icpt_code) {
 549         case ICPT_INSTRUCTION:
 550             r = handle_instruction(cpu, run);
 551             break;
 552         case ICPT_WAITPSW:
 553             if (s390_del_running_cpu(env) == 0 &&
 554                 is_special_wait_psw(env)) {
 555                 qemu_system_shutdown_request();
 556             }
 557             r = EXCP_HALTED;
 558             break;
 559         case ICPT_CPU_STOP:
 560             if (s390_del_running_cpu(env) == 0) {
 561                 qemu_system_shutdown_request();
 562             }
 563             r = EXCP_HALTED;
 564             break;
 565         case ICPT_SOFT_INTERCEPT:
 566             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 567             exit(1);
 568             break;
 569         case ICPT_IO:
 570             fprintf(stderr, "KVM unimplemented icpt IO\n");
 571             exit(1);
 572             break;
 573         default:
 574             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 575             exit(1);
 576             break;
 577     }
 578
 579     return r;
 580 }
 581
 582 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 583 {
 584     S390CPU *cpu = S390_CPU(cs);
 585     int ret = 0;
 586
 587     switch (run->exit_reason) {
 588         case KVM_EXIT_S390_SIEIC:
 589             ret = handle_intercept(cpu);
 590             break;
 591         case KVM_EXIT_S390_RESET:
 592             qemu_system_reset_request();
 593             break;
 594         default:
 595             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 596             break;
 597     }
 598
 599     if (ret == 0) {
 600         ret = EXCP_INTERRUPT;
 601     }
 602     return ret;
 603 }
 604
 605 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 606 {
 607     return true;
 608 }
 609
 610 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 611 {
 612     return 1;
 613 }
 614
 615 int kvm_arch_on_sigbus(int code, void *addr)
 616 {
 617     return 1;
 618 }