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
  38 /* #define DEBUG_KVM */
  39
  40 #ifdef DEBUG_KVM
  41 #define dprintf(fmt, ...) \
  42     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  43 #else
  44 #define dprintf(fmt, ...) \
  45     do { } while (0)
  46 #endif
  47
  48 #define IPA0_DIAG                       0x8300
  49 #define IPA0_SIGP                       0xae00
  50 #define IPA0_PRIV                       0xb200
  51
  52 #define PRIV_SCLP_CALL                  0x20
  53 #define DIAG_KVM_HYPERCALL              0x500
  54 #define DIAG_KVM_BREAKPOINT             0x501
  55
  56 #define ICPT_INSTRUCTION                0x04
  57 #define ICPT_WAITPSW                    0x1c
  58 #define ICPT_SOFT_INTERCEPT             0x24
  59 #define ICPT_CPU_STOP                   0x28
  60 #define ICPT_IO                         0x40
  61
  62 #define SIGP_RESTART                    0x06
  63 #define SIGP_INITIAL_CPU_RESET          0x0b
  64 #define SIGP_STORE_STATUS_ADDR          0x0e
  65 #define SIGP_SET_ARCH                   0x12
  66
  67 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  68     KVM_CAP_LAST_INFO
  69 };
  70
  71 static int cap_sync_regs;
  72
  73 int kvm_arch_init(KVMState *s)
  74 {
  75     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
  76     return 0;
  77 }
  78
  79 int kvm_arch_init_vcpu(CPUState *cpu)
  80 {
  81     int ret = 0;
  82
  83     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
  84         perror("cannot init reset vcpu");
  85     }
  86
  87     return ret;
  88 }
  89
  90 void kvm_arch_reset_vcpu(CPUState *cpu)
  91 {
  92     /* FIXME: add code to reset vcpu. */
  93 }
  94
  95 int kvm_arch_put_registers(CPUState *cs, int level)
  96 {
  97     S390CPU *cpu = S390_CPU(cs);
  98     CPUS390XState *env = &cpu->env;
  99     struct kvm_sregs sregs;
 100     struct kvm_regs regs;
 101     int ret;
 102     int i;
 103
 104     /* always save the PSW  and the GPRS*/
 105     cs->kvm_run->psw_addr = env->psw.addr;
 106     cs->kvm_run->psw_mask = env->psw.mask;
 107
 108     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 109         for (i = 0; i < 16; i++) {
 110             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 111             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 112         }
 113     } else {
 114         for (i = 0; i < 16; i++) {
 115             regs.gprs[i] = env->regs[i];
 116         }
 117         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 118         if (ret < 0) {
 119             return ret;
 120         }
 121     }
 122
 123     /* Do we need to save more than that? */
 124     if (level == KVM_PUT_RUNTIME_STATE) {
 125         return 0;
 126     }
 127
 128     if (cap_sync_regs &&
 129         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 130         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 131         for (i = 0; i < 16; i++) {
 132             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 133             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 134         }
 135         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 136         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 137     } else {
 138         for (i = 0; i < 16; i++) {
 139             sregs.acrs[i] = env->aregs[i];
 140             sregs.crs[i] = env->cregs[i];
 141         }
 142         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 143         if (ret < 0) {
 144             return ret;
 145         }
 146     }
 147
 148     /* Finally the prefix */
 149     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 150         cs->kvm_run->s.regs.prefix = env->psa;
 151         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 152     } else {
 153         /* prefix is only supported via sync regs */
 154     }
 155     return 0;
 156 }
 157
 158 int kvm_arch_get_registers(CPUState *cs)
 159 {
 160     S390CPU *cpu = S390_CPU(cs);
 161     CPUS390XState *env = &cpu->env;
 162     struct kvm_sregs sregs;
 163     struct kvm_regs regs;
 164     int ret;
 165     int i;
 166
 167     /* get the PSW */
 168     env->psw.addr = cs->kvm_run->psw_addr;
 169     env->psw.mask = cs->kvm_run->psw_mask;
 170
 171     /* the GPRS */
 172     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 173         for (i = 0; i < 16; i++) {
 174             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 175         }
 176     } else {
 177         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 178         if (ret < 0) {
 179             return ret;
 180         }
 181          for (i = 0; i < 16; i++) {
 182             env->regs[i] = regs.gprs[i];
 183         }
 184     }
 185
 186     /* The ACRS and CRS */
 187     if (cap_sync_regs &&
 188         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 189         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 190         for (i = 0; i < 16; i++) {
 191             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 192             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 193         }
 194     } else {
 195         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 196         if (ret < 0) {
 197             return ret;
 198         }
 199          for (i = 0; i < 16; i++) {
 200             env->aregs[i] = sregs.acrs[i];
 201             env->cregs[i] = sregs.crs[i];
 202         }
 203     }
 204
 205     /* Finally the prefix */
 206     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 207         env->psa = cs->kvm_run->s.regs.prefix;
 208     } else {
 209         /* no prefix without sync regs */
 210     }
 211
 212     return 0;
 213 }
 214
 215 /*
 216  * Legacy layout for s390:
 217  * Older S390 KVM requires the topmost vma of the RAM to be
 218  * smaller than an system defined value, which is at least 256GB.
 219  * Larger systems have larger values. We put the guest between
 220  * the end of data segment (system break) and this value. We
 221  * use 32GB as a base to have enough room for the system break
 222  * to grow. We also have to use MAP parameters that avoid
 223  * read-only mapping of guest pages.
 224  */
 225 static void *legacy_s390_alloc(ram_addr_t size)
 226 {
 227     void *mem;
 228
 229     mem = mmap((void *) 0x800000000ULL, size,
 230                PROT_EXEC|PROT_READ|PROT_WRITE,
 231                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 232     if (mem == MAP_FAILED) {
 233         fprintf(stderr, "Allocating RAM failed\n");
 234         abort();
 235     }
 236     return mem;
 237 }
 238
 239 void *kvm_arch_vmalloc(ram_addr_t size)
 240 {
 241     /* Can we use the standard allocation ? */
 242     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 243         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 244         return NULL;
 245     } else {
 246         return legacy_s390_alloc(size);
 247     }
 248 }
 249
 250 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 251 {
 252     S390CPU *cpu = S390_CPU(cs);
 253     CPUS390XState *env = &cpu->env;
 254     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 255
 256     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 257         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 258         return -EINVAL;
 259     }
 260     return 0;
 261 }
 262
 263 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 264 {
 265     S390CPU *cpu = S390_CPU(cs);
 266     CPUS390XState *env = &cpu->env;
 267     uint8_t t[4];
 268     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 269
 270     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 271         return -EINVAL;
 272     } else if (memcmp(t, diag_501, 4)) {
 273         return -EINVAL;
 274     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 275         return -EINVAL;
 276     }
 277
 278     return 0;
 279 }
 280
 281 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 282 {
 283 }
 284
 285 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 286 {
 287 }
 288
 289 int kvm_arch_process_async_events(CPUState *cs)
 290 {
 291     S390CPU *cpu = S390_CPU(cs);
 292     return cpu->env.halted;
 293 }
 294
 295 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 296                                  uint64_t parm64, int vm)
 297 {
 298     CPUState *cs = CPU(cpu);
 299     struct kvm_s390_interrupt kvmint;
 300     int r;
 301
 302     if (!cs->kvm_state) {
 303         return;
 304     }
 305
 306     kvmint.type = type;
 307     kvmint.parm = parm;
 308     kvmint.parm64 = parm64;
 309
 310     if (vm) {
 311         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 312     } else {
 313         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 314     }
 315
 316     if (r < 0) {
 317         fprintf(stderr, "KVM failed to inject interrupt\n");
 318         exit(1);
 319     }
 320 }
 321
 322 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 323 {
 324     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 325                                 token, 1);
 326 }
 327
 328 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 329 {
 330     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 331 }
 332
 333 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 334 {
 335     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 336 }
 337
 338 static inline void setcc(S390CPU *cpu, uint64_t cc)
 339 {
 340     CPUS390XState *env = &cpu->env;
 341     CPUState *cs = CPU(cpu);
 342
 343     cs->kvm_run->psw_mask &= ~(3ull << 44);
 344     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 345
 346     env->psw.mask &= ~(3ul << 44);
 347     env->psw.mask |= (cc & 3) << 44;
 348 }
 349
 350 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 351                                  uint16_t ipbh0)
 352 {
 353     CPUS390XState *env = &cpu->env;
 354     uint32_t sccb;
 355     uint64_t code;
 356     int r = 0;
 357
 358     cpu_synchronize_state(env);
 359     sccb = env->regs[ipbh0 & 0xf];
 360     code = env->regs[(ipbh0 & 0xf0) >> 4];
 361
 362     r = sclp_service_call(sccb, code);
 363     if (r < 0) {
 364         enter_pgmcheck(cpu, -r);
 365     }
 366     setcc(cpu, r);
 367
 368     return 0;
 369 }
 370
 371 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 372 {
 373     int r = 0;
 374     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 375
 376     dprintf("KVM: PRIV: %d\n", ipa1);
 377     switch (ipa1) {
 378         case PRIV_SCLP_CALL:
 379             r = kvm_sclp_service_call(cpu, run, ipbh0);
 380             break;
 381         default:
 382             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 383             r = -1;
 384             break;
 385     }
 386
 387     return r;
 388 }
 389
 390 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 391 {
 392     cpu_synchronize_state(env);
 393     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 394
 395     return 0;
 396 }
 397
 398 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 399 {
 400     int r = 0;
 401
 402     switch (ipb_code) {
 403         case DIAG_KVM_HYPERCALL:
 404             r = handle_hypercall(env, run);
 405             break;
 406         case DIAG_KVM_BREAKPOINT:
 407             sleep(10);
 408             break;
 409         default:
 410             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 411             r = -1;
 412             break;
 413     }
 414
 415     return r;
 416 }
 417
 418 static int s390_cpu_restart(S390CPU *cpu)
 419 {
 420     CPUS390XState *env = &cpu->env;
 421
 422     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 423     s390_add_running_cpu(env);
 424     qemu_cpu_kick(CPU(cpu));
 425     dprintf("DONE: SIGP cpu restart: %p\n", env);
 426     return 0;
 427 }
 428
 429 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 430 {
 431     /* XXX */
 432     fprintf(stderr, "XXX SIGP store status\n");
 433     return -1;
 434 }
 435
 436 static int s390_cpu_initial_reset(S390CPU *cpu)
 437 {
 438     CPUS390XState *env = &cpu->env;
 439     int i;
 440
 441     s390_del_running_cpu(env);
 442     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 443         perror("cannot init reset vcpu");
 444     }
 445
 446     /* Manually zero out all registers */
 447     cpu_synchronize_state(env);
 448     for (i = 0; i < 16; i++) {
 449         env->regs[i] = 0;
 450     }
 451
 452     dprintf("DONE: SIGP initial reset: %p\n", env);
 453     return 0;
 454 }
 455
 456 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 457 {
 458     CPUS390XState *env = &cpu->env;
 459     uint8_t order_code;
 460     uint32_t parameter;
 461     uint16_t cpu_addr;
 462     uint8_t t;
 463     int r = -1;
 464     S390CPU *target_cpu;
 465     CPUS390XState *target_env;
 466
 467     cpu_synchronize_state(env);
 468
 469     /* get order code */
 470     order_code = run->s390_sieic.ipb >> 28;
 471     if (order_code > 0) {
 472         order_code = env->regs[order_code];
 473     }
 474     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 475
 476     /* get parameters */
 477     t = (ipa1 & 0xf0) >> 4;
 478     if (!(t % 2)) {
 479         t++;
 480     }
 481
 482     parameter = env->regs[t] & 0x7ffffe00;
 483     cpu_addr = env->regs[ipa1 & 0x0f];
 484
 485     target_cpu = s390_cpu_addr2state(cpu_addr);
 486     if (target_cpu == NULL) {
 487         goto out;
 488     }
 489     target_env = &target_cpu->env;
 490
 491     switch (order_code) {
 492         case SIGP_RESTART:
 493             r = s390_cpu_restart(target_cpu);
 494             break;
 495         case SIGP_STORE_STATUS_ADDR:
 496             r = s390_store_status(target_env, parameter);
 497             break;
 498         case SIGP_SET_ARCH:
 499             /* make the caller panic */
 500             return -1;
 501         case SIGP_INITIAL_CPU_RESET:
 502             r = s390_cpu_initial_reset(target_cpu);
 503             break;
 504         default:
 505             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 506             break;
 507     }
 508
 509 out:
 510     setcc(cpu, r ? 3 : 0);
 511     return 0;
 512 }
 513
 514 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 515 {
 516     CPUS390XState *env = &cpu->env;
 517     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 518     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 519     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 520     int r = -1;
 521
 522     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 523     switch (ipa0) {
 524         case IPA0_PRIV:
 525             r = handle_priv(cpu, run, ipa1);
 526             break;
 527         case IPA0_DIAG:
 528             r = handle_diag(env, run, ipb_code);
 529             break;
 530         case IPA0_SIGP:
 531             r = handle_sigp(cpu, run, ipa1);
 532             break;
 533     }
 534
 535     if (r < 0) {
 536         enter_pgmcheck(cpu, 0x0001);
 537     }
 538     return 0;
 539 }
 540
 541 static bool is_special_wait_psw(CPUState *cs)
 542 {
 543     /* signal quiesce */
 544     return cs->kvm_run->psw_addr == 0xfffUL;
 545 }
 546
 547 static int handle_intercept(S390CPU *cpu)
 548 {
 549     CPUS390XState *env = &cpu->env;
 550     CPUState *cs = CPU(cpu);
 551     struct kvm_run *run = cs->kvm_run;
 552     int icpt_code = run->s390_sieic.icptcode;
 553     int r = 0;
 554
 555     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 556             (long)cs->kvm_run->psw_addr);
 557     switch (icpt_code) {
 558         case ICPT_INSTRUCTION:
 559             r = handle_instruction(cpu, run);
 560             break;
 561         case ICPT_WAITPSW:
 562             if (s390_del_running_cpu(env) == 0 &&
 563                 is_special_wait_psw(cs)) {
 564                 qemu_system_shutdown_request();
 565             }
 566             r = EXCP_HALTED;
 567             break;
 568         case ICPT_CPU_STOP:
 569             if (s390_del_running_cpu(env) == 0) {
 570                 qemu_system_shutdown_request();
 571             }
 572             r = EXCP_HALTED;
 573             break;
 574         case ICPT_SOFT_INTERCEPT:
 575             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 576             exit(1);
 577             break;
 578         case ICPT_IO:
 579             fprintf(stderr, "KVM unimplemented icpt IO\n");
 580             exit(1);
 581             break;
 582         default:
 583             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 584             exit(1);
 585             break;
 586     }
 587
 588     return r;
 589 }
 590
 591 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 592 {
 593     S390CPU *cpu = S390_CPU(cs);
 594     int ret = 0;
 595
 596     switch (run->exit_reason) {
 597         case KVM_EXIT_S390_SIEIC:
 598             ret = handle_intercept(cpu);
 599             break;
 600         case KVM_EXIT_S390_RESET:
 601             qemu_system_reset_request();
 602             break;
 603         default:
 604             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 605             break;
 606     }
 607
 608     if (ret == 0) {
 609         ret = EXCP_INTERRUPT;
 610     }
 611     return ret;
 612 }
 613
 614 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 615 {
 616     return true;
 617 }
 618
 619 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 620 {
 621     return 1;
 622 }
 623
 624 int kvm_arch_on_sigbus(int code, void *addr)
 625 {
 626     return 1;
 627 }