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 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
  64 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
  65
  66 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  67     KVM_CAP_LAST_INFO
  68 };
  69
  70 int kvm_arch_init(KVMState *s)
  71 {
  72     return 0;
  73 }
  74
  75 int kvm_arch_init_vcpu(CPUS390XState *env)
  76 {
  77     int ret = 0;
  78
  79     if (kvm_vcpu_ioctl(env, 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(CPUS390XState *env)
  87 {
  88     /* FIXME: add code to reset vcpu. */
  89 }
  90
  91 int kvm_arch_put_registers(CPUS390XState *env, int level)
  92 {
  93     struct kvm_regs regs;
  94     int ret;
  95     int i;
  96
  97     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
  98     if (ret < 0) {
  99         return ret;
 100     }
 101
 102     for (i = 0; i < 16; i++) {
 103         regs.gprs[i] = env->regs[i];
 104     }
 105
 106     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 107     if (ret < 0) {
 108         return ret;
 109     }
 110
 111     env->kvm_run->psw_addr = env->psw.addr;
 112     env->kvm_run->psw_mask = env->psw.mask;
 113
 114     return ret;
 115 }
 116
 117 int kvm_arch_get_registers(CPUS390XState *env)
 118 {
 119     int ret;
 120     struct kvm_regs regs;
 121     int i;
 122
 123     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 124     if (ret < 0) {
 125         return ret;
 126     }
 127
 128     for (i = 0; i < 16; i++) {
 129         env->regs[i] = regs.gprs[i];
 130     }
 131
 132     env->psw.addr = env->kvm_run->psw_addr;
 133     env->psw.mask = env->kvm_run->psw_mask;
 134
 135     return 0;
 136 }
 137
 138 /*
 139  * Legacy layout for s390:
 140  * Older S390 KVM requires the topmost vma of the RAM to be
 141  * smaller than an system defined value, which is at least 256GB.
 142  * Larger systems have larger values. We put the guest between
 143  * the end of data segment (system break) and this value. We
 144  * use 32GB as a base to have enough room for the system break
 145  * to grow. We also have to use MAP parameters that avoid
 146  * read-only mapping of guest pages.
 147  */
 148 static void *legacy_s390_alloc(ram_addr_t size)
 149 {
 150     void *mem;
 151
 152     mem = mmap((void *) 0x800000000ULL, size,
 153                PROT_EXEC|PROT_READ|PROT_WRITE,
 154                MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 155     if (mem == MAP_FAILED) {
 156         fprintf(stderr, "Allocating RAM failed\n");
 157         abort();
 158     }
 159     return mem;
 160 }
 161
 162 void *kvm_arch_vmalloc(ram_addr_t size)
 163 {
 164     /* Can we use the standard allocation ? */
 165     if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
 166         kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
 167         return NULL;
 168     } else {
 169         return legacy_s390_alloc(size);
 170     }
 171 }
 172
 173 int kvm_arch_insert_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
 174 {
 175     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 176
 177     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 178         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 179         return -EINVAL;
 180     }
 181     return 0;
 182 }
 183
 184 int kvm_arch_remove_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
 185 {
 186     uint8_t t[4];
 187     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 188
 189     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 190         return -EINVAL;
 191     } else if (memcmp(t, diag_501, 4)) {
 192         return -EINVAL;
 193     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 194         return -EINVAL;
 195     }
 196
 197     return 0;
 198 }
 199
 200 void kvm_arch_pre_run(CPUS390XState *env, struct kvm_run *run)
 201 {
 202 }
 203
 204 void kvm_arch_post_run(CPUS390XState *env, struct kvm_run *run)
 205 {
 206 }
 207
 208 int kvm_arch_process_async_events(CPUS390XState *env)
 209 {
 210     return env->halted;
 211 }
 212
 213 void kvm_s390_interrupt_internal(CPUS390XState *env, int type, uint32_t parm,
 214                                  uint64_t parm64, int vm)
 215 {
 216     struct kvm_s390_interrupt kvmint;
 217     int r;
 218
 219     if (!env->kvm_state) {
 220         return;
 221     }
 222
 223     kvmint.type = type;
 224     kvmint.parm = parm;
 225     kvmint.parm64 = parm64;
 226
 227     if (vm) {
 228         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 229     } else {
 230         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
 231     }
 232
 233     if (r < 0) {
 234         fprintf(stderr, "KVM failed to inject interrupt\n");
 235         exit(1);
 236     }
 237 }
 238
 239 void kvm_s390_virtio_irq(CPUS390XState *env, int config_change, uint64_t token)
 240 {
 241     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
 242                                 token, 1);
 243 }
 244
 245 void kvm_s390_interrupt(CPUS390XState *env, int type, uint32_t code)
 246 {
 247     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 248 }
 249
 250 static void enter_pgmcheck(CPUS390XState *env, uint16_t code)
 251 {
 252     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 253 }
 254
 255 static inline void setcc(CPUS390XState *env, uint64_t cc)
 256 {
 257     env->kvm_run->psw_mask &= ~(3ull << 44);
 258     env->kvm_run->psw_mask |= (cc & 3) << 44;
 259
 260     env->psw.mask &= ~(3ul << 44);
 261     env->psw.mask |= (cc & 3) << 44;
 262 }
 263
 264 static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run,
 265                                  uint16_t ipbh0)
 266 {
 267     uint32_t sccb;
 268     uint64_t code;
 269     int r = 0;
 270
 271     cpu_synchronize_state(env);
 272     sccb = env->regs[ipbh0 & 0xf];
 273     code = env->regs[(ipbh0 & 0xf0) >> 4];
 274
 275     r = sclp_service_call(env, sccb, code);
 276     if (r < 0) {
 277         enter_pgmcheck(env, -r);
 278     }
 279     setcc(env, r);
 280
 281     return 0;
 282 }
 283
 284 static int handle_priv(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 285 {
 286     int r = 0;
 287     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 288
 289     dprintf("KVM: PRIV: %d\n", ipa1);
 290     switch (ipa1) {
 291         case PRIV_SCLP_CALL:
 292             r = kvm_sclp_service_call(env, run, ipbh0);
 293             break;
 294         default:
 295             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 296             r = -1;
 297             break;
 298     }
 299
 300     return r;
 301 }
 302
 303 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 304 {
 305     cpu_synchronize_state(env);
 306     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 307
 308     return 0;
 309 }
 310
 311 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 312 {
 313     int r = 0;
 314
 315     switch (ipb_code) {
 316         case DIAG_KVM_HYPERCALL:
 317             r = handle_hypercall(env, run);
 318             break;
 319         case DIAG_KVM_BREAKPOINT:
 320             sleep(10);
 321             break;
 322         default:
 323             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 324             r = -1;
 325             break;
 326     }
 327
 328     return r;
 329 }
 330
 331 static int s390_cpu_restart(S390CPU *cpu)
 332 {
 333     CPUS390XState *env = &cpu->env;
 334
 335     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
 336     s390_add_running_cpu(env);
 337     qemu_cpu_kick(env);
 338     dprintf("DONE: SIGP cpu restart: %p\n", env);
 339     return 0;
 340 }
 341
 342 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 343 {
 344     /* XXX */
 345     fprintf(stderr, "XXX SIGP store status\n");
 346     return -1;
 347 }
 348
 349 static int s390_cpu_initial_reset(CPUS390XState *env)
 350 {
 351     int i;
 352
 353     s390_del_running_cpu(env);
 354     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
 355         perror("cannot init reset vcpu");
 356     }
 357
 358     /* Manually zero out all registers */
 359     cpu_synchronize_state(env);
 360     for (i = 0; i < 16; i++) {
 361         env->regs[i] = 0;
 362     }
 363
 364     dprintf("DONE: SIGP initial reset: %p\n", env);
 365     return 0;
 366 }
 367
 368 static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 369 {
 370     uint8_t order_code;
 371     uint32_t parameter;
 372     uint16_t cpu_addr;
 373     uint8_t t;
 374     int r = -1;
 375     S390CPU *target_cpu;
 376     CPUS390XState *target_env;
 377
 378     cpu_synchronize_state(env);
 379
 380     /* get order code */
 381     order_code = run->s390_sieic.ipb >> 28;
 382     if (order_code > 0) {
 383         order_code = env->regs[order_code];
 384     }
 385     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 386
 387     /* get parameters */
 388     t = (ipa1 & 0xf0) >> 4;
 389     if (!(t % 2)) {
 390         t++;
 391     }
 392
 393     parameter = env->regs[t] & 0x7ffffe00;
 394     cpu_addr = env->regs[ipa1 & 0x0f];
 395
 396     target_cpu = s390_cpu_addr2state(cpu_addr);
 397     if (target_cpu == NULL) {
 398         goto out;
 399     }
 400     target_env = &target_cpu->env;
 401
 402     switch (order_code) {
 403         case SIGP_RESTART:
 404             r = s390_cpu_restart(target_cpu);
 405             break;
 406         case SIGP_STORE_STATUS_ADDR:
 407             r = s390_store_status(target_env, parameter);
 408             break;
 409         case SIGP_SET_ARCH:
 410             /* make the caller panic */
 411             return -1;
 412         case SIGP_INITIAL_CPU_RESET:
 413             r = s390_cpu_initial_reset(target_env);
 414             break;
 415         default:
 416             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 417             break;
 418     }
 419
 420 out:
 421     setcc(env, r ? 3 : 0);
 422     return 0;
 423 }
 424
 425 static int handle_instruction(CPUS390XState *env, struct kvm_run *run)
 426 {
 427     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 428     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 429     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 430     int r = -1;
 431
 432     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 433     switch (ipa0) {
 434         case IPA0_PRIV:
 435             r = handle_priv(env, run, ipa1);
 436             break;
 437         case IPA0_DIAG:
 438             r = handle_diag(env, run, ipb_code);
 439             break;
 440         case IPA0_SIGP:
 441             r = handle_sigp(env, run, ipa1);
 442             break;
 443     }
 444
 445     if (r < 0) {
 446         enter_pgmcheck(env, 0x0001);
 447     }
 448     return 0;
 449 }
 450
 451 static bool is_special_wait_psw(CPUS390XState *env)
 452 {
 453     /* signal quiesce */
 454     return env->kvm_run->psw_addr == 0xfffUL;
 455 }
 456
 457 static int handle_intercept(CPUS390XState *env)
 458 {
 459     struct kvm_run *run = env->kvm_run;
 460     int icpt_code = run->s390_sieic.icptcode;
 461     int r = 0;
 462
 463     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 464             (long)env->kvm_run->psw_addr);
 465     switch (icpt_code) {
 466         case ICPT_INSTRUCTION:
 467             r = handle_instruction(env, run);
 468             break;
 469         case ICPT_WAITPSW:
 470             if (s390_del_running_cpu(env) == 0 &&
 471                 is_special_wait_psw(env)) {
 472                 qemu_system_shutdown_request();
 473             }
 474             r = EXCP_HALTED;
 475             break;
 476         case ICPT_CPU_STOP:
 477             if (s390_del_running_cpu(env) == 0) {
 478                 qemu_system_shutdown_request();
 479             }
 480             r = EXCP_HALTED;
 481             break;
 482         case ICPT_SOFT_INTERCEPT:
 483             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 484             exit(1);
 485             break;
 486         case ICPT_IO:
 487             fprintf(stderr, "KVM unimplemented icpt IO\n");
 488             exit(1);
 489             break;
 490         default:
 491             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 492             exit(1);
 493             break;
 494     }
 495
 496     return r;
 497 }
 498
 499 int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run)
 500 {
 501     int ret = 0;
 502
 503     switch (run->exit_reason) {
 504         case KVM_EXIT_S390_SIEIC:
 505             ret = handle_intercept(env);
 506             break;
 507         case KVM_EXIT_S390_RESET:
 508             qemu_system_reset_request();
 509             break;
 510         default:
 511             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 512             break;
 513     }
 514
 515     if (ret == 0) {
 516         ret = EXCP_INTERRUPT;
 517     }
 518     return ret;
 519 }
 520
 521 bool kvm_arch_stop_on_emulation_error(CPUS390XState *env)
 522 {
 523     return true;
 524 }
 525
 526 int kvm_arch_on_sigbus_vcpu(CPUS390XState *env, int code, void *addr)
 527 {
 528     return 1;
 529 }
 530
 531 int kvm_arch_on_sigbus(int code, void *addr)
 532 {
 533     return 1;
 534 }