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 int kvm_arch_insert_sw_breakpoint(CPUS390XState *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(CPUS390XState *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(CPUS390XState *env, struct kvm_run *run)
 166 {
 167 }
 168
 169 void kvm_arch_post_run(CPUS390XState *env, struct kvm_run *run)
 170 {
 171 }
 172
 173 int kvm_arch_process_async_events(CPUS390XState *env)
 174 {
 175     return env->halted;
 176 }
 177
 178 void kvm_s390_interrupt_internal(CPUS390XState *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     kvmint.type = type;
 189     kvmint.parm = parm;
 190     kvmint.parm64 = parm64;
 191
 192     if (vm) {
 193         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 194     } else {
 195         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
 196     }
 197
 198     if (r < 0) {
 199         fprintf(stderr, "KVM failed to inject interrupt\n");
 200         exit(1);
 201     }
 202 }
 203
 204 void kvm_s390_virtio_irq(CPUS390XState *env, int config_change, uint64_t token)
 205 {
 206     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
 207                                 token, 1);
 208 }
 209
 210 void kvm_s390_interrupt(CPUS390XState *env, int type, uint32_t code)
 211 {
 212     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 213 }
 214
 215 static void enter_pgmcheck(CPUS390XState *env, uint16_t code)
 216 {
 217     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 218 }
 219
 220 static inline void setcc(CPUS390XState *env, uint64_t cc)
 221 {
 222     env->kvm_run->psw_mask &= ~(3ull << 44);
 223     env->kvm_run->psw_mask |= (cc & 3) << 44;
 224
 225     env->psw.mask &= ~(3ul << 44);
 226     env->psw.mask |= (cc & 3) << 44;
 227 }
 228
 229 static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run,
 230                                  uint16_t ipbh0)
 231 {
 232     uint32_t sccb;
 233     uint64_t code;
 234     int r = 0;
 235
 236     cpu_synchronize_state(env);
 237     sccb = env->regs[ipbh0 & 0xf];
 238     code = env->regs[(ipbh0 & 0xf0) >> 4];
 239
 240     r = sclp_service_call(env, sccb, code);
 241     if (r) {
 242         setcc(env, 3);
 243     }
 244
 245     return 0;
 246 }
 247
 248 static int handle_priv(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 249 {
 250     int r = 0;
 251     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 252
 253     dprintf("KVM: PRIV: %d\n", ipa1);
 254     switch (ipa1) {
 255         case PRIV_SCLP_CALL:
 256             r = kvm_sclp_service_call(env, run, ipbh0);
 257             break;
 258         default:
 259             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 260             r = -1;
 261             break;
 262     }
 263
 264     return r;
 265 }
 266
 267 static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
 268 {
 269     cpu_synchronize_state(env);
 270     env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
 271
 272     return 0;
 273 }
 274
 275 static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
 276 {
 277     int r = 0;
 278
 279     switch (ipb_code) {
 280         case DIAG_KVM_HYPERCALL:
 281             r = handle_hypercall(env, run);
 282             break;
 283         case DIAG_KVM_BREAKPOINT:
 284             sleep(10);
 285             break;
 286         default:
 287             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 288             r = -1;
 289             break;
 290     }
 291
 292     return r;
 293 }
 294
 295 static int s390_cpu_restart(S390CPU *cpu)
 296 {
 297     CPUS390XState *env = &cpu->env;
 298
 299     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
 300     s390_add_running_cpu(env);
 301     qemu_cpu_kick(env);
 302     dprintf("DONE: SIGP cpu restart: %p\n", env);
 303     return 0;
 304 }
 305
 306 static int s390_store_status(CPUS390XState *env, uint32_t parameter)
 307 {
 308     /* XXX */
 309     fprintf(stderr, "XXX SIGP store status\n");
 310     return -1;
 311 }
 312
 313 static int s390_cpu_initial_reset(CPUS390XState *env)
 314 {
 315     int i;
 316
 317     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
 318         perror("cannot init reset vcpu");
 319     }
 320
 321     /* Manually zero out all registers */
 322     cpu_synchronize_state(env);
 323     for (i = 0; i < 16; i++) {
 324         env->regs[i] = 0;
 325     }
 326
 327     dprintf("DONE: SIGP initial reset: %p\n", env);
 328     return 0;
 329 }
 330
 331 static int handle_sigp(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
 332 {
 333     uint8_t order_code;
 334     uint32_t parameter;
 335     uint16_t cpu_addr;
 336     uint8_t t;
 337     int r = -1;
 338     S390CPU *target_cpu;
 339     CPUS390XState *target_env;
 340
 341     cpu_synchronize_state(env);
 342
 343     /* get order code */
 344     order_code = run->s390_sieic.ipb >> 28;
 345     if (order_code > 0) {
 346         order_code = env->regs[order_code];
 347     }
 348     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 349
 350     /* get parameters */
 351     t = (ipa1 & 0xf0) >> 4;
 352     if (!(t % 2)) {
 353         t++;
 354     }
 355
 356     parameter = env->regs[t] & 0x7ffffe00;
 357     cpu_addr = env->regs[ipa1 & 0x0f];
 358
 359     target_cpu = s390_cpu_addr2state(cpu_addr);
 360     if (target_cpu == NULL) {
 361         goto out;
 362     }
 363     target_env = &target_cpu->env;
 364
 365     switch (order_code) {
 366         case SIGP_RESTART:
 367             r = s390_cpu_restart(target_cpu);
 368             break;
 369         case SIGP_STORE_STATUS_ADDR:
 370             r = s390_store_status(target_env, parameter);
 371             break;
 372         case SIGP_SET_ARCH:
 373             /* make the caller panic */
 374             return -1;
 375         case SIGP_INITIAL_CPU_RESET:
 376             r = s390_cpu_initial_reset(target_env);
 377             break;
 378         default:
 379             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
 380             break;
 381     }
 382
 383 out:
 384     setcc(env, r ? 3 : 0);
 385     return 0;
 386 }
 387
 388 static int handle_instruction(CPUS390XState *env, struct kvm_run *run)
 389 {
 390     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 391     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 392     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 393     int r = -1;
 394
 395     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 396     switch (ipa0) {
 397         case IPA0_PRIV:
 398             r = handle_priv(env, run, ipa1);
 399             break;
 400         case IPA0_DIAG:
 401             r = handle_diag(env, run, ipb_code);
 402             break;
 403         case IPA0_SIGP:
 404             r = handle_sigp(env, run, ipa1);
 405             break;
 406     }
 407
 408     if (r < 0) {
 409         enter_pgmcheck(env, 0x0001);
 410     }
 411     return 0;
 412 }
 413
 414 static bool is_special_wait_psw(CPUS390XState *env)
 415 {
 416     /* signal quiesce */
 417     return env->kvm_run->psw_addr == 0xfffUL;
 418 }
 419
 420 static int handle_intercept(CPUS390XState *env)
 421 {
 422     struct kvm_run *run = env->kvm_run;
 423     int icpt_code = run->s390_sieic.icptcode;
 424     int r = 0;
 425
 426     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
 427             (long)env->kvm_run->psw_addr);
 428     switch (icpt_code) {
 429         case ICPT_INSTRUCTION:
 430             r = handle_instruction(env, run);
 431             break;
 432         case ICPT_WAITPSW:
 433             if (s390_del_running_cpu(env) == 0 &&
 434                 is_special_wait_psw(env)) {
 435                 qemu_system_shutdown_request();
 436             }
 437             r = EXCP_HALTED;
 438             break;
 439         case ICPT_CPU_STOP:
 440             if (s390_del_running_cpu(env) == 0) {
 441                 qemu_system_shutdown_request();
 442             }
 443             r = EXCP_HALTED;
 444             break;
 445         case ICPT_SOFT_INTERCEPT:
 446             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 447             exit(1);
 448             break;
 449         case ICPT_IO:
 450             fprintf(stderr, "KVM unimplemented icpt IO\n");
 451             exit(1);
 452             break;
 453         default:
 454             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 455             exit(1);
 456             break;
 457     }
 458
 459     return r;
 460 }
 461
 462 int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run)
 463 {
 464     int ret = 0;
 465
 466     switch (run->exit_reason) {
 467         case KVM_EXIT_S390_SIEIC:
 468             ret = handle_intercept(env);
 469             break;
 470         case KVM_EXIT_S390_RESET:
 471             qemu_system_reset_request();
 472             break;
 473         default:
 474             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 475             break;
 476     }
 477
 478     if (ret == 0) {
 479         ret = EXCP_INTERRUPT;
 480     }
 481     return ret;
 482 }
 483
 484 bool kvm_arch_stop_on_emulation_error(CPUS390XState *env)
 485 {
 486     return true;
 487 }
 488
 489 int kvm_arch_on_sigbus_vcpu(CPUS390XState *env, int code, void *addr)
 490 {
 491     return 1;
 492 }
 493
 494 int kvm_arch_on_sigbus(int code, void *addr)
 495 {
 496     return 1;
 497 }