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     CPUS390XState *env = &cpu->env;
 295     CPUState *cs = CPU(cpu);
 296     struct kvm_s390_interrupt kvmint;
 297     int r;
 298
 299     if (!env->kvm_state) {
 300         return;
 301     }
 302
 303     kvmint.type = type;
 304     kvmint.parm = parm;
 305     kvmint.parm64 = parm64;
 306
 307     if (vm) {
 308         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 309     } else {
 310         r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
 311     }
 312
 313     if (r < 0) {
 314         fprintf(stderr, "KVM failed to inject interrupt\n");
 315         exit(1);
 316     }
 317 }
 318
 319 void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 320 {
 321     kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
 322                                 token, 1);
 323 }
 324
 325 void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
 326 {
 327     kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
 328 }
 329
 330 static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
 331 {
 332     kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
 333 }
 334
 335 static inline void setcc(CPUS390XState *env, uint64_t cc)
 336 {
 337     env->kvm_run->psw_mask &= ~(3ull << 44);
 338     env->kvm_run->psw_mask |= (cc & 3) << 44;
 339
 340     env->psw.mask &= ~(3ul << 44);
 341     env->psw.mask |= (cc & 3) << 44;
 342 }
 343
 344 static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
 345                                  uint16_t ipbh0)
 346 {
 347     CPUS390XState *env = &cpu->env;
 348     uint32_t sccb;
 349     uint64_t code;
 350     int r = 0;
 351
 352     cpu_synchronize_state(env);
 353     sccb = env->regs[ipbh0 & 0xf];
 354     code = env->regs[(ipbh0 & 0xf0) >> 4];
 355
 356     r = sclp_service_call(sccb, code);
 357     if (r < 0) {
 358         enter_pgmcheck(cpu, -r);
 359     }
 360     setcc(env, r);
 361
 362     return 0;
 363 }
 364
 365 static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
 366 {
 367     int r = 0;
 368     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 369
 370     dprintf("KVM: PRIV: %d\n", ipa1);
 371     switch (ipa1) {
 372         case PRIV_SCLP_CALL:
 373             r = kvm_sclp_service_call(cpu, run, ipbh0);
 374             break;
 375         default:
 376             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 377             r = -1;
 378             break;
 379     }
 380
 381     return r;
 382 }
 383
 384 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 385 {
 386     cpu_synchronize_state(env);
 387     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 388
 389     return 0;
 390 }
 391
 392 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 393 {
 394     int r = 0;
 395
 396     switch (ipb_code) {
 397         case DIAG_KVM_HYPERCALL:
 398             r = handle_hypercall(env, run);
 399             break;
 400         case DIAG_KVM_BREAKPOINT:
 401             sleep(10);
 402             break;
 403         default:
 404             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 405             r = -1;
 406             break;
 407     }
 408
 409     return r;
 410 }
 411
 412 static int s390_cpu_restart(S390CPU *cpu)
 413 {
 414     CPUS390XState *env = &cpu->env;
 415
 416     kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
 417     s390_add_running_cpu(env);
 418     qemu_cpu_kick(CPU(cpu));
 419     dprintf("DONE: SIGP cpu restart: %p\n", env);
 420     return 0;
 421 }
 422
 423 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 424 {
 425     /* XXX */
 426     fprintf(stderr, "XXX SIGP store status\n");
 427     return -1;
 428 }
 429
 430 static int s390_cpu_initial_reset(S390CPU *cpu)
 431 {
 432     CPUS390XState *env = &cpu->env;
 433     int i;
 434
 435     s390_del_running_cpu(env);
 436     if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
 437         perror("cannot init reset vcpu");
 438     }
 439
 440     /* Manually zero out all registers */
 441     cpu_synchronize_state(env);
 442     for (i = 0; i < 16; i++) {
 443         env->regs[i] = 0;
 444     }
 445
 446     dprintf("DONE: SIGP initial reset: %p\n", env);
 447     return 0;
 448 }
 449
 450 static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 451 {
 452     uint8_t order_code;
 453     uint32_t parameter;
 454     uint16_t cpu_addr;
 455     uint8_t t;
 456     int r = -1;
 457     S390CPU *target_cpu;
 458     CPUS390XState *target_env;
 459
 460     cpu_synchronize_state(env);
 461
 462     /* get order code */
 463     order_code = run->s390_sieic.ipb >> 28;
 464     if (order_code > 0) {
 465         order_code = env->regs[order_code];
 466     }
 467     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 468
 469     /* get parameters */
 470     t = (ipa1 & 0xf0) >> 4;
 471     if (!(t % 2)) {
 472         t++;
 473     }
 474
 475     parameter = env->regs[t] & 0x7ffffe00;
 476     cpu_addr = env->regs[ipa1 & 0x0f];
 477
 478     target_cpu = s390_cpu_addr2state(cpu_addr);
 479     if (target_cpu == NULL) {
 480         goto out;
 481     }
 482     target_env = &target_cpu->env;
 483
 484     switch (order_code) {
 485         case SIGP_RESTART:
 486             r = s390_cpu_restart(target_cpu);
 487             break;
 488         case SIGP_STORE_STATUS_ADDR:
 489             r = s390_store_status(target_env, parameter);
 490             break;
 491         case SIGP_SET_ARCH:
 492             /* make the caller panic */
 493             return -1;
 494         case SIGP_INITIAL_CPU_RESET:
 495             r = s390_cpu_initial_reset(target_cpu);
 496             break;
 497         default:
 498             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 499             break;
 500     }
 501
 502 out:
 503     setcc(env, r ? 3 : 0);
 504     return 0;
 505 }
 506
 507 static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
 508 {
 509     CPUS390XState *env = &cpu->env;
 510     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 511     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 512     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 513     int r = -1;
 514
 515     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 516     switch (ipa0) {
 517         case IPA0_PRIV:
 518             r = handle_priv(cpu, run, ipa1);
 519             break;
 520         case IPA0_DIAG:
 521             r = handle_diag(env, run, ipb_code);
 522             break;
 523         case IPA0_SIGP:
 524             r = handle_sigp(env, run, ipa1);
 525             break;
 526     }
 527
 528     if (r < 0) {
 529         enter_pgmcheck(cpu, 0x0001);
 530     }
 531     return 0;
 532 }
 533
 534 static bool is_special_wait_psw(CPUS390XState *env)
 535 {
 536     /* signal quiesce */
 537     return env->kvm_run->psw_addr == 0xfffUL;
 538 }
 539
 540 static int handle_intercept(S390CPU *cpu)
 541 {
 542     CPUS390XState *env = &cpu->env;
 543     struct kvm_run *run = env->kvm_run;
 544     int icpt_code = run->s390_sieic.icptcode;
 545     int r = 0;
 546
 547     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 548             (long)env->kvm_run->psw_addr);
 549     switch (icpt_code) {
 550         case ICPT_INSTRUCTION:
 551             r = handle_instruction(cpu, run);
 552             break;
 553         case ICPT_WAITPSW:
 554             if (s390_del_running_cpu(env) == 0 &&
 555                 is_special_wait_psw(env)) {
 556                 qemu_system_shutdown_request();
 557             }
 558             r = EXCP_HALTED;
 559             break;
 560         case ICPT_CPU_STOP:
 561             if (s390_del_running_cpu(env) == 0) {
 562                 qemu_system_shutdown_request();
 563             }
 564             r = EXCP_HALTED;
 565             break;
 566         case ICPT_SOFT_INTERCEPT:
 567             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 568             exit(1);
 569             break;
 570         case ICPT_IO:
 571             fprintf(stderr, "KVM unimplemented icpt IO\n");
 572             exit(1);
 573             break;
 574         default:
 575             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 576             exit(1);
 577             break;
 578     }
 579
 580     return r;
 581 }
 582
 583 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 584 {
 585     S390CPU *cpu = S390_CPU(cs);
 586     int ret = 0;
 587
 588     switch (run->exit_reason) {
 589         case KVM_EXIT_S390_SIEIC:
 590             ret = handle_intercept(cpu);
 591             break;
 592         case KVM_EXIT_S390_RESET:
 593             qemu_system_reset_request();
 594             break;
 595         default:
 596             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 597             break;
 598     }
 599
 600     if (ret == 0) {
 601         ret = EXCP_INTERRUPT;
 602     }
 603     return ret;
 604 }
 605
 606 bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
 607 {
 608     return true;
 609 }
 610
 611 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 612 {
 613     return 1;
 614 }
 615
 616 int kvm_arch_on_sigbus(int code, void *addr)
 617 {
 618     return 1;
 619 }