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/sysemu.h"
  30 #include "sysemu/kvm.h"
  31 #include "cpu.h"
  32 #include "sysemu/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     cs->kvm_run->psw_addr = env->psw.addr;
 102     cs->kvm_run->psw_mask = env->psw.mask;
 103
 104     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 105         for (i = 0; i < 16; i++) {
 106             cs->kvm_run->s.regs.gprs[i] = env->regs[i];
 107             cs->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         cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
 126         cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
 127         for (i = 0; i < 16; i++) {
 128             cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
 129             cs->kvm_run->s.regs.crs[i] = env->cregs[i];
 130         }
 131         cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
 132         cs->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 && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 146         cs->kvm_run->s.regs.prefix = env->psa;
 147         cs->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 = cs->kvm_run->psw_addr;
 165     env->psw.mask = cs->kvm_run->psw_mask;
 166
 167     /* the GPRS */
 168     if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
 169         for (i = 0; i < 16; i++) {
 170             env->regs[i] = cs->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         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             env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
 188             env->cregs[i] = cs->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 && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
 203         env->psa = cs->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(S390CPU *cpu, uint64_t cc)
 335 {
 336     CPUS390XState *env = &cpu->env;
 337     CPUState *cs = CPU(cpu);
 338
 339     cs->kvm_run->psw_mask &= ~(3ull << 44);
 340     cs->kvm_run->psw_mask |= (cc & 3) << 44;
 341
 342     env->psw.mask &= ~(3ul << 44);
 343     env->psw.mask |= (cc & 3) << 44;
 344 }
 345
 346 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 347                                  uint16_t ipbh0)
 348 {
 349     CPUS390XState *env = &cpu->env;
 350     uint32_t sccb;
 351     uint64_t code;
 352     int r = 0;
 353
 354     cpu_synchronize_state(env);
 355     sccb = env->regs[ipbh0 & 0xf];
 356     code = env->regs[(ipbh0 & 0xf0) >> 4];
 357
 358     r = sclp_service_call(sccb, code);
 359     if (r < 0) {
 360         enter_pgmcheck(cpu, -r);
 361     }
 362     setcc(cpu, r);
 363
 364     return 0;
 365 }
 366
 367 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 368 {
 369     int r = 0;
 370     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 371
 372     dprintf("KVM: PRIV: %d\n", ipa1);
 373     switch (ipa1) {
 374         case PRIV_SCLP_CALL:
 375             r = kvm_sclp_service_call(cpu, run, ipbh0);
 376             break;
 377         default:
 378             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 379             r = -1;
 380             break;
 381     }
 382
 383     return r;
 384 }
 385
 386 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 387 {
 388     cpu_synchronize_state(env);
 389     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 390
 391     return 0;
 392 }
 393
 394 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 395 {
 396     int r = 0;
 397
 398     switch (ipb_code) {
 399         case DIAG_KVM_HYPERCALL:
 400             r = handle_hypercall(env, run);
 401             break;
 402         case DIAG_KVM_BREAKPOINT:
 403             sleep(10);
 404             break;
 405         default:
 406             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 407             r = -1;
 408             break;
 409     }
 410
 411     return r;
 412 }
 413
 414 static int s390_cpu_restart(S390CPU *cpu)
 415 {
 416     CPUS390XState *env = &cpu->env;
 417
 418     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 419     s390_add_running_cpu(env);
 420     qemu_cpu_kick(CPU(cpu));
 421     dprintf("DONE: SIGP cpu restart: %p\n", env);
 422     return 0;
 423 }
 424
 425 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 426 {
 427     /* XXX */
 428     fprintf(stderr, "XXX SIGP store status\n");
 429     return -1;
 430 }
 431
 432 static int s390_cpu_initial_reset(S390CPU *cpu)
 433 {
 434     CPUS390XState *env = &cpu->env;
 435     int i;
 436
 437     s390_del_running_cpu(env);
 438     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 439         perror("cannot init reset vcpu");
 440     }
 441
 442     /* Manually zero out all registers */
 443     cpu_synchronize_state(env);
 444     for (i = 0; i < 16; i++) {
 445         env->regs[i] = 0;
 446     }
 447
 448     dprintf("DONE: SIGP initial reset: %p\n", env);
 449     return 0;
 450 }
 451
 452 static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 453 {
 454     CPUS390XState *env = &cpu->env;
 455     uint8_t order_code;
 456     uint32_t parameter;
 457     uint16_t cpu_addr;
 458     uint8_t t;
 459     int r = -1;
 460     S390CPU *target_cpu;
 461     CPUS390XState *target_env;
 462
 463     cpu_synchronize_state(env);
 464
 465     /* get order code */
 466     order_code = run->s390_sieic.ipb >> 28;
 467     if (order_code > 0) {
 468         order_code = env->regs[order_code];
 469     }
 470     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 471
 472     /* get parameters */
 473     t = (ipa1 & 0xf0) >> 4;
 474     if (!(t % 2)) {
 475         t++;
 476     }
 477
 478     parameter = env->regs[t] & 0x7ffffe00;
 479     cpu_addr = env->regs[ipa1 & 0x0f];
 480
 481     target_cpu = s390_cpu_addr2state(cpu_addr);
 482     if (target_cpu == NULL) {
 483         goto out;
 484     }
 485     target_env = &target_cpu->env;
 486
 487     switch (order_code) {
 488         case SIGP_RESTART:
 489             r = s390_cpu_restart(target_cpu);
 490             break;
 491         case SIGP_STORE_STATUS_ADDR:
 492             r = s390_store_status(target_env, parameter);
 493             break;
 494         case SIGP_SET_ARCH:
 495             /* make the caller panic */
 496             return -1;
 497         case SIGP_INITIAL_CPU_RESET:
 498             r = s390_cpu_initial_reset(target_cpu);
 499             break;
 500         default:
 501             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 502             break;
 503     }
 504
 505 out:
 506     setcc(cpu, r ? 3 : 0);
 507     return 0;
 508 }
 509
 510 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 511 {
 512     CPUS390XState *env = &cpu->env;
 513     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 514     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 515     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 516     int r = -1;
 517
 518     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 519     switch (ipa0) {
 520         case IPA0_PRIV:
 521             r = handle_priv(cpu, run, ipa1);
 522             break;
 523         case IPA0_DIAG:
 524             r = handle_diag(env, run, ipb_code);
 525             break;
 526         case IPA0_SIGP:
 527             r = handle_sigp(cpu, run, ipa1);
 528             break;
 529     }
 530
 531     if (r < 0) {
 532         enter_pgmcheck(cpu, 0x0001);
 533     }
 534     return 0;
 535 }
 536
 537 static bool is_special_wait_psw(CPUState *cs)
 538 {
 539     /* signal quiesce */
 540     return cs->kvm_run->psw_addr == 0xfffUL;
 541 }
 542
 543 static int handle_intercept(S390CPU *cpu)
 544 {
 545     CPUS390XState *env = &cpu->env;
 546     CPUState *cs = CPU(cpu);
 547     struct kvm_run *run = cs->kvm_run;
 548     int icpt_code = run->s390_sieic.icptcode;
 549     int r = 0;
 550
 551     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 552             (long)cs->kvm_run->psw_addr);
 553     switch (icpt_code) {
 554         case ICPT_INSTRUCTION:
 555             r = handle_instruction(cpu, run);
 556             break;
 557         case ICPT_WAITPSW:
 558             if (s390_del_running_cpu(env) == 0 &&
 559                 is_special_wait_psw(cs)) {
 560                 qemu_system_shutdown_request();
 561             }
 562             r = EXCP_HALTED;
 563             break;
 564         case ICPT_CPU_STOP:
 565             if (s390_del_running_cpu(env) == 0) {
 566                 qemu_system_shutdown_request();
 567             }
 568             r = EXCP_HALTED;
 569             break;
 570         case ICPT_SOFT_INTERCEPT:
 571             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 572             exit(1);
 573             break;
 574         case ICPT_IO:
 575             fprintf(stderr, "KVM unimplemented icpt IO\n");
 576             exit(1);
 577             break;
 578         default:
 579             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 580             exit(1);
 581             break;
 582     }
 583
 584     return r;
 585 }
 586
 587 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 588 {
 589     S390CPU *cpu = S390_CPU(cs);
 590     int ret = 0;
 591
 592     switch (run->exit_reason) {
 593         case KVM_EXIT_S390_SIEIC:
 594             ret = handle_intercept(cpu);
 595             break;
 596         case KVM_EXIT_S390_RESET:
 597             qemu_system_reset_request();
 598             break;
 599         default:
 600             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 601             break;
 602     }
 603
 604     if (ret == 0) {
 605         ret = EXCP_INTERRUPT;
 606     }
 607     return ret;
 608 }
 609
 610 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 611 {
 612     return true;
 613 }
 614
 615 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 616 {
 617     return 1;
 618 }
 619
 620 int kvm_arch_on_sigbus(int code, void *addr)
 621 {
 622     return 1;
 623 }