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(CPUState *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(CPUState *env)
  87 {
  88     /* FIXME: add code to reset vcpu. */
  89 }
  90
  91 int kvm_arch_put_registers(CPUState *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(CPUState *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 int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 139 {
 140     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 141
 142     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 143         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 144         return -EINVAL;
 145     }
 146     return 0;
 147 }
 148
 149 int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 150 {
 151     uint8_t t[4];
 152     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 153
 154     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 155         return -EINVAL;
 156     } else if (memcmp(t, diag_501, 4)) {
 157         return -EINVAL;
 158     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 159         return -EINVAL;
 160     }
 161
 162     return 0;
 163 }
 164
 165 void kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 166 {
 167 }
 168
 169 void kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 170 {
 171 }
 172
 173 int kvm_arch_process_async_events(CPUState *env)
 174 {
 175     return env->halted;
 176 }
 177
 178 void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
 179                                  uint64_t parm64, int vm)
 180 {
 181     struct kvm_s390_interrupt kvmint;
 182     int r;
 183
 184     if (!env->kvm_state) {
 185         return;
 186     }
 187
 188     env->halted = 0;
 189     env->exception_index = -1;
 190     qemu_cpu_kick(env);
 191
 192     kvmint.type = type;
 193     kvmint.parm = parm;
 194     kvmint.parm64 = parm64;
 195
 196     if (vm) {
 197         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 198     } else {
 199         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
 200     }
 201
 202     if (r < 0) {
 203         fprintf(stderr, "KVM failed to inject interrupt\n");
 204         exit(1);
 205     }
 206 }
 207
 208 void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
 209 {
 210     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
 211                                 token, 1);
 212 }
 213
 214 void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
 215 {
 216     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 217 }
 218
 219 static void enter_pgmcheck(CPUState *env, uint16_t code)
 220 {
 221     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 222 }
 223
 224 static inline void setcc(CPUState *env, uint64_t cc)
 225 {
 226     env->kvm_run->psw_mask &= ~(3ull << 44);
 227     env->kvm_run->psw_mask |= (cc & 3) << 44;
 228
 229     env->psw.mask &= ~(3ul << 44);
 230     env->psw.mask |= (cc & 3) << 44;
 231 }
 232
 233 static int kvm_sclp_service_call(CPUState *env, struct kvm_run *run,
 234                                  uint16_t ipbh0)
 235 {
 236     uint32_t sccb;
 237     uint64_t code;
 238     int r = 0;
 239
 240     cpu_synchronize_state(env);
 241     sccb = env->regs[ipbh0 & 0xf];
 242     code = env->regs[(ipbh0 & 0xf0) >> 4];
 243
 244     r = sclp_service_call(env, sccb, code);
 245     if (r) {
 246         setcc(env, 3);
 247     }
 248
 249     return 0;
 250 }
 251
 252 static int handle_priv(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 253 {
 254     int r = 0;
 255     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 256
 257     dprintf("KVM: PRIV: %d\n", ipa1);
 258     switch (ipa1) {
 259         case PRIV_SCLP_CALL:
 260             r = kvm_sclp_service_call(env, run, ipbh0);
 261             break;
 262         default:
 263             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 264             r = -1;
 265             break;
 266     }
 267
 268     return r;
 269 }
 270
 271 static int handle_hypercall(CPUState *env, struct kvm_run *run)
 272 {
 273     cpu_synchronize_state(env);
 274     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 275
 276     return 0;
 277 }
 278
 279 static int handle_diag(CPUState *env, struct kvm_run *run, int ipb_code)
 280 {
 281     int r = 0;
 282
 283     switch (ipb_code) {
 284         case DIAG_KVM_HYPERCALL:
 285             r = handle_hypercall(env, run);
 286             break;
 287         case DIAG_KVM_BREAKPOINT:
 288             sleep(10);
 289             break;
 290         default:
 291             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 292             r = -1;
 293             break;
 294     }
 295
 296     return r;
 297 }
 298
 299 static int s390_cpu_restart(CPUState *env)
 300 {
 301     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
 302     env->halted = 0;
 303     env->exception_index = -1;
 304     qemu_cpu_kick(env);
 305     dprintf("DONE: SIGP cpu restart: %p\n", env);
 306     return 0;
 307 }
 308
 309 static int s390_store_status(CPUState *env, uint32_t parameter)
 310 {
 311     /* XXX */
 312     fprintf(stderr, "XXX SIGP store status\n");
 313     return -1;
 314 }
 315
 316 static int s390_cpu_initial_reset(CPUState *env)
 317 {
 318     int i;
 319
 320     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
 321         perror("cannot init reset vcpu");
 322     }
 323
 324     /* Manually zero out all registers */
 325     cpu_synchronize_state(env);
 326     for (i = 0; i < 16; i++) {
 327         env->regs[i] = 0;
 328     }
 329
 330     dprintf("DONE: SIGP initial reset: %p\n", env);
 331     return 0;
 332 }
 333
 334 static int handle_sigp(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 335 {
 336     uint8_t order_code;
 337     uint32_t parameter;
 338     uint16_t cpu_addr;
 339     uint8_t t;
 340     int r = -1;
 341     CPUState *target_env;
 342
 343     cpu_synchronize_state(env);
 344
 345     /* get order code */
 346     order_code = run->s390_sieic.ipb >> 28;
 347     if (order_code > 0) {
 348         order_code = env->regs[order_code];
 349     }
 350     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 351
 352     /* get parameters */
 353     t = (ipa1 & 0xf0) >> 4;
 354     if (!(t % 2)) {
 355         t++;
 356     }
 357
 358     parameter = env->regs[t] & 0x7ffffe00;
 359     cpu_addr = env->regs[ipa1 & 0x0f];
 360
 361     target_env = s390_cpu_addr2state(cpu_addr);
 362     if (!target_env) {
 363         goto out;
 364     }
 365
 366     switch (order_code) {
 367         case SIGP_RESTART:
 368             r = s390_cpu_restart(target_env);
 369             break;
 370         case SIGP_STORE_STATUS_ADDR:
 371             r = s390_store_status(target_env, parameter);
 372             break;
 373         case SIGP_SET_ARCH:
 374             /* make the caller panic */
 375             return -1;
 376         case SIGP_INITIAL_CPU_RESET:
 377             r = s390_cpu_initial_reset(target_env);
 378             break;
 379         default:
 380             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 381             break;
 382     }
 383
 384 out:
 385     setcc(env, r ? 3 : 0);
 386     return 0;
 387 }
 388
 389 static int handle_instruction(CPUState *env, struct kvm_run *run)
 390 {
 391     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 392     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 393     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 394     int r = -1;
 395
 396     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 397     switch (ipa0) {
 398         case IPA0_PRIV:
 399             r = handle_priv(env, run, ipa1);
 400             break;
 401         case IPA0_DIAG:
 402             r = handle_diag(env, run, ipb_code);
 403             break;
 404         case IPA0_SIGP:
 405             r = handle_sigp(env, run, ipa1);
 406             break;
 407     }
 408
 409     if (r < 0) {
 410         enter_pgmcheck(env, 0x0001);
 411     }
 412     return 0;
 413 }
 414
 415 static int handle_intercept(CPUState *env)
 416 {
 417     struct kvm_run *run = env->kvm_run;
 418     int icpt_code = run->s390_sieic.icptcode;
 419     int r = 0;
 420
 421     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 422             (long)env->kvm_run->psw_addr);
 423     switch (icpt_code) {
 424         case ICPT_INSTRUCTION:
 425             r = handle_instruction(env, run);
 426             break;
 427         case ICPT_WAITPSW:
 428             /* XXX What to do on system shutdown? */
 429             env->halted = 1;
 430             env->exception_index = EXCP_HLT;
 431             break;
 432         case ICPT_SOFT_INTERCEPT:
 433             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 434             exit(1);
 435             break;
 436         case ICPT_CPU_STOP:
 437             qemu_system_shutdown_request();
 438             break;
 439         case ICPT_IO:
 440             fprintf(stderr, "KVM unimplemented icpt IO\n");
 441             exit(1);
 442             break;
 443         default:
 444             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 445             exit(1);
 446             break;
 447     }
 448
 449     return r;
 450 }
 451
 452 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 453 {
 454     int ret = 0;
 455
 456     switch (run->exit_reason) {
 457         case KVM_EXIT_S390_SIEIC:
 458             ret = handle_intercept(env);
 459             break;
 460         case KVM_EXIT_S390_RESET:
 461             fprintf(stderr, "RESET not implemented\n");
 462             exit(1);
 463             break;
 464         default:
 465             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 466             break;
 467     }
 468
 469     if (ret == 0) {
 470         ret = EXCP_INTERRUPT;
 471     } else if (ret > 0) {
 472         ret = 0;
 473     }
 474     return ret;
 475 }
 476
 477 bool kvm_arch_stop_on_emulation_error(CPUState *env)
 478 {
 479     return true;
 480 }
 481
 482 int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void *addr)
 483 {
 484     return 1;
 485 }
 486
 487 int kvm_arch_on_sigbus(int code, void *addr)
 488 {
 489     return 1;
 490 }