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     /* The initial reset call is needed here to reset in-kernel
  93      * vcpu data that we can't access directly from QEMU
  94      * (i.e. with older kernels which don't support sync_regs/ONE_REG).
  95      * Before this ioctl cpu_synchronize_state() is called in common kvm
  96      * code (kvm-all) */
  97     if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
  98         perror("Can't reset vcpu\n");
  99     }
 100 }
 101
 102 int kvm_arch_put_registers(CPUState *cs, int level)
 103 {
 104     S390CPU *cpu = S390_CPU(cs);
 105     CPUS390XState *env = &cpu->env;
 106     struct kvm_sregs sregs;
 107     struct kvm_regs regs;
 108     int ret;
 109     int i;
 110
 111     /* always save the PSW  and the GPRS*/
 112     cs->kvm_run->psw_addr = env->psw.addr;
 113     cs->kvm_run->psw_mask = env->psw.mask;
 114
 115     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 116         for (i = 0; i < 16; i++) {
 117             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 118             cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
 119         }
 120     } else {
 121         for (i = 0; i < 16; i++) {
 122             regs.gprs[i] = env->regs[i];
 123         }
 124         ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
 125         if (ret < 0) {
 126             return ret;
 127         }
 128     }
 129
 130     /* Do we need to save more than that? */
 131     if (level == KVM_PUT_RUNTIME_STATE) {
 132         return 0;
 133     }
 134
 135     if (cap_sync_regs &&
 136         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 137         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 138         for (i = 0; i < 16; i++) {
 139             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 140             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 141         }
 142         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 143         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
 144     } else {
 145         for (i = 0; i < 16; i++) {
 146             sregs.acrs[i] = env->aregs[i];
 147             sregs.crs[i] = env->cregs[i];
 148         }
 149         ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
 150         if (ret < 0) {
 151             return ret;
 152         }
 153     }
 154
 155     /* Finally the prefix */
 156     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 157         cs->kvm_run->s.regs.prefix = env->psa;
 158         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
 159     } else {
 160         /* prefix is only supported via sync regs */
 161     }
 162     return 0;
 163 }
 164
 165 int kvm_arch_get_registers(CPUState *cs)
 166 {
 167     S390CPU *cpu = S390_CPU(cs);
 168     CPUS390XState *env = &cpu->env;
 169     struct kvm_sregs sregs;
 170     struct kvm_regs regs;
 171     int ret;
 172     int i;
 173
 174     /* get the PSW */
 175     env->psw.addr = cs->kvm_run->psw_addr;
 176     env->psw.mask = cs->kvm_run->psw_mask;
 177
 178     /* the GPRS */
 179     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 180         for (i = 0; i < 16; i++) {
 181             env->regs[i] = cs->kvm_run->s.regs.gprs[i];
 182         }
 183     } else {
 184         ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
 185         if (ret < 0) {
 186             return ret;
 187         }
 188          for (i = 0; i < 16; i++) {
 189             env->regs[i] = regs.gprs[i];
 190         }
 191     }
 192
 193     /* The ACRS and CRS */
 194     if (cap_sync_regs &&
 195         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 196         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 197         for (i = 0; i < 16; i++) {
 198             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 199             env->cregs[i] = cs->kvm_run->s.regs.crs[i];
 200         }
 201     } else {
 202         ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
 203         if (ret < 0) {
 204             return ret;
 205         }
 206          for (i = 0; i < 16; i++) {
 207             env->aregs[i] = sregs.acrs[i];
 208             env->cregs[i] = sregs.crs[i];
 209         }
 210     }
 211
 212     /* Finally the prefix */
 213     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 214         env->psa = cs->kvm_run->s.regs.prefix;
 215     } else {
 216         /* no prefix without sync regs */
 217     }
 218
 219     return 0;
 220 }
 221
 222 /*
 223  * Legacy layout for s390:
 224  * Older S390 KVM requires the topmost vma of the RAM to be
 225  * smaller than an system defined value, which is at least 256GB.
 226  * Larger systems have larger values. We put the guest between
 227  * the end of data segment (system break) and this value. We
 228  * use 32GB as a base to have enough room for the system break
 229  * to grow. We also have to use MAP parameters that avoid
 230  * read-only mapping of guest pages.
 231  */
 232 static void *legacy_s390_alloc(ram_addr_t size)
 233 {
 234     void *mem;
 235
 236     mem = mmap((void *) 0x800000000ULL, size,
 237                PROT_EXEC|PROT_READ|PROT_WRITE,
 238                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 239     if (mem == MAP_FAILED) {
 240         fprintf(stderr, "Allocating RAM failed\n");
 241         abort();
 242     }
 243     return mem;
 244 }
 245
 246 void *kvm_arch_vmalloc(ram_addr_t size)
 247 {
 248     /* Can we use the standard allocation ? */
 249     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 250         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 251         return NULL;
 252     } else {
 253         return legacy_s390_alloc(size);
 254     }
 255 }
 256
 257 int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 258 {
 259     S390CPU *cpu = S390_CPU(cs);
 260     CPUS390XState *env = &cpu->env;
 261     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 262
 263     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 264         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 265         return -EINVAL;
 266     }
 267     return 0;
 268 }
 269
 270 int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
 271 {
 272     S390CPU *cpu = S390_CPU(cs);
 273     CPUS390XState *env = &cpu->env;
 274     uint8_t t[4];
 275     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 276
 277     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 278         return -EINVAL;
 279     } else if (memcmp(t, diag_501, 4)) {
 280         return -EINVAL;
 281     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 282         return -EINVAL;
 283     }
 284
 285     return 0;
 286 }
 287
 288 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
 289 {
 290 }
 291
 292 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
 293 {
 294 }
 295
 296 int kvm_arch_process_async_events(CPUState *cs)
 297 {
 298     S390CPU *cpu = S390_CPU(cs);
 299     return cpu->env.halted;
 300 }
 301
 302 void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
 303                                  uint64_t parm64, int vm)
 304 {
 305     CPUState *cs = CPU(cpu);
 306     struct kvm_s390_interrupt kvmint;
 307     int r;
 308
 309     if (!cs->kvm_state) {
 310         return;
 311     }
 312
 313     kvmint.type = type;
 314     kvmint.parm = parm;
 315     kvmint.parm64 = parm64;
 316
 317     if (vm) {
 318         r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 319     } else {
 320         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 321     }
 322
 323     if (r < 0) {
 324         fprintf(stderr, "KVM failed to inject interrupt\n");
 325         exit(1);
 326     }
 327 }
 328
 329 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 330 {
 331     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 332                                 token, 1);
 333 }
 334
 335 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 336 {
 337     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 338 }
 339
 340 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 341 {
 342     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 343 }
 344
 345 static inline void setcc(S390CPU *cpu, uint64_t cc)
 346 {
 347     CPUS390XState *env = &cpu->env;
 348     CPUState *cs = CPU(cpu);
 349
 350     cs->kvm_run->psw_mask &= ~(3ull << 44);
 351     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 352
 353     env->psw.mask &= ~(3ul << 44);
 354     env->psw.mask |= (cc & 3) << 44;
 355 }
 356
 357 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 358                                  uint16_t ipbh0)
 359 {
 360     CPUS390XState *env = &cpu->env;
 361     uint32_t sccb;
 362     uint64_t code;
 363     int r = 0;
 364
 365     cpu_synchronize_state(env);
 366     sccb = env->regs[ipbh0 & 0xf];
 367     code = env->regs[(ipbh0 & 0xf0) >> 4];
 368
 369     r = sclp_service_call(sccb, code);
 370     if (r < 0) {
 371         enter_pgmcheck(cpu, -r);
 372     }
 373     setcc(cpu, r);
 374
 375     return 0;
 376 }
 377
 378 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 379 {
 380     int r = 0;
 381     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 382
 383     dprintf("KVM: PRIV: %d\n", ipa1);
 384     switch (ipa1) {
 385         case PRIV_SCLP_CALL:
 386             r = kvm_sclp_service_call(cpu, run, ipbh0);
 387             break;
 388         default:
 389             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 390             r = -1;
 391             break;
 392     }
 393
 394     return r;
 395 }
 396
 397 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 398 {
 399     cpu_synchronize_state(env);
 400     env->regs[2] = s390_virtio_hypercall(env);
 401
 402     return 0;
 403 }
 404
 405 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 406 {
 407     int r = 0;
 408
 409     switch (ipb_code) {
 410         case DIAG_KVM_HYPERCALL:
 411             r = handle_hypercall(env, run);
 412             break;
 413         case DIAG_KVM_BREAKPOINT:
 414             sleep(10);
 415             break;
 416         default:
 417             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 418             r = -1;
 419             break;
 420     }
 421
 422     return r;
 423 }
 424
 425 static int s390_cpu_restart(S390CPU *cpu)
 426 {
 427     CPUS390XState *env = &cpu->env;
 428
 429     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 430     s390_add_running_cpu(env);
 431     qemu_cpu_kick(CPU(cpu));
 432     dprintf("DONE: SIGP cpu restart: %p\n", env);
 433     return 0;
 434 }
 435
 436 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 437 {
 438     /* XXX */
 439     fprintf(stderr, "XXX SIGP store status\n");
 440     return -1;
 441 }
 442
 443 static int s390_cpu_initial_reset(S390CPU *cpu)
 444 {
 445     CPUS390XState *env = &cpu->env;
 446     int i;
 447
 448     s390_del_running_cpu(env);
 449     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 450         perror("cannot init reset vcpu");
 451     }
 452
 453     /* Manually zero out all registers */
 454     cpu_synchronize_state(env);
 455     for (i = 0; i < 16; i++) {
 456         env->regs[i] = 0;
 457     }
 458
 459     dprintf("DONE: SIGP initial reset: %p\n", env);
 460     return 0;
 461 }
 462
 463 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 464 {
 465     CPUS390XState *env = &cpu->env;
 466     uint8_t order_code;
 467     uint32_t parameter;
 468     uint16_t cpu_addr;
 469     uint8_t t;
 470     int r = -1;
 471     S390CPU *target_cpu;
 472     CPUS390XState *target_env;
 473
 474     cpu_synchronize_state(env);
 475
 476     /* get order code */
 477     order_code = run->s390_sieic.ipb >> 28;
 478     if (order_code > 0) {
 479         order_code = env->regs[order_code];
 480     }
 481     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 482
 483     /* get parameters */
 484     t = (ipa1 & 0xf0) >> 4;
 485     if (!(t % 2)) {
 486         t++;
 487     }
 488
 489     parameter = env->regs[t] & 0x7ffffe00;
 490     cpu_addr = env->regs[ipa1 & 0x0f];
 491
 492     target_cpu = s390_cpu_addr2state(cpu_addr);
 493     if (target_cpu == NULL) {
 494         goto out;
 495     }
 496     target_env = &target_cpu->env;
 497
 498     switch (order_code) {
 499         case SIGP_RESTART:
 500             r = s390_cpu_restart(target_cpu);
 501             break;
 502         case SIGP_STORE_STATUS_ADDR:
 503             r = s390_store_status(target_env, parameter);
 504             break;
 505         case SIGP_SET_ARCH:
 506             /* make the caller panic */
 507             return -1;
 508         case SIGP_INITIAL_CPU_RESET:
 509             r = s390_cpu_initial_reset(target_cpu);
 510             break;
 511         default:
 512             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 513             break;
 514     }
 515
 516 out:
 517     setcc(cpu, r ? 3 : 0);
 518     return 0;
 519 }
 520
 521 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 522 {
 523     CPUS390XState *env = &cpu->env;
 524     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 525     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 526     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 527     int r = -1;
 528
 529     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 530     switch (ipa0) {
 531         case IPA0_PRIV:
 532             r = handle_priv(cpu, run, ipa1);
 533             break;
 534         case IPA0_DIAG:
 535             r = handle_diag(env, run, ipb_code);
 536             break;
 537         case IPA0_SIGP:
 538             r = handle_sigp(cpu, run, ipa1);
 539             break;
 540     }
 541
 542     if (r < 0) {
 543         enter_pgmcheck(cpu, 0x0001);
 544     }
 545     return 0;
 546 }
 547
 548 static bool is_special_wait_psw(CPUState *cs)
 549 {
 550     /* signal quiesce */
 551     return cs->kvm_run->psw_addr == 0xfffUL;
 552 }
 553
 554 static int handle_intercept(S390CPU *cpu)
 555 {
 556     CPUS390XState *env = &cpu->env;
 557     CPUState *cs = CPU(cpu);
 558     struct kvm_run *run = cs->kvm_run;
 559     int icpt_code = run->s390_sieic.icptcode;
 560     int r = 0;
 561
 562     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 563             (long)cs->kvm_run->psw_addr);
 564     switch (icpt_code) {
 565         case ICPT_INSTRUCTION:
 566             r = handle_instruction(cpu, run);
 567             break;
 568         case ICPT_WAITPSW:
 569             if (s390_del_running_cpu(env) == 0 &&
 570                 is_special_wait_psw(cs)) {
 571                 qemu_system_shutdown_request();
 572             }
 573             r = EXCP_HALTED;
 574             break;
 575         case ICPT_CPU_STOP:
 576             if (s390_del_running_cpu(env) == 0) {
 577                 qemu_system_shutdown_request();
 578             }
 579             r = EXCP_HALTED;
 580             break;
 581         case ICPT_SOFT_INTERCEPT:
 582             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 583             exit(1);
 584             break;
 585         case ICPT_IO:
 586             fprintf(stderr, "KVM unimplemented icpt IO\n");
 587             exit(1);
 588             break;
 589         default:
 590             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 591             exit(1);
 592             break;
 593     }
 594
 595     return r;
 596 }
 597
 598 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 599 {
 600     S390CPU *cpu = S390_CPU(cs);
 601     int ret = 0;
 602
 603     switch (run->exit_reason) {
 604         case KVM_EXIT_S390_SIEIC:
 605             ret = handle_intercept(cpu);
 606             break;
 607         case KVM_EXIT_S390_RESET:
 608             qemu_system_reset_request();
 609             break;
 610         default:
 611             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 612             break;
 613     }
 614
 615     if (ret == 0) {
 616         ret = EXCP_INTERRUPT;
 617     }
 618     return ret;
 619 }
 620
 621 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 622 {
 623     return true;
 624 }
 625
 626 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 627 {
 628     return 1;
 629 }
 630
 631 int kvm_arch_on_sigbus(int code, void *addr)
 632 {
 633     return 1;
 634 }