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 SCP_LENGTH                      0x00
  53 #define SCP_FUNCTION_CODE               0x02
  54 #define SCP_CONTROL_MASK                0x03
  55 #define SCP_RESPONSE_CODE               0x06
  56 #define SCP_MEM_CODE                    0x08
  57 #define SCP_INCREMENT                   0x0a
  58
  59 #define ICPT_INSTRUCTION                0x04
  60 #define ICPT_WAITPSW                    0x1c
  61 #define ICPT_SOFT_INTERCEPT             0x24
  62 #define ICPT_CPU_STOP                   0x28
  63 #define ICPT_IO                         0x40
  64
  65 #define SIGP_RESTART                    0x06
  66 #define SIGP_INITIAL_CPU_RESET          0x0b
  67 #define SIGP_STORE_STATUS_ADDR          0x0e
  68 #define SIGP_SET_ARCH                   0x12
  69
  70 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
  71 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
  72
  73 int kvm_arch_init(KVMState *s, int smp_cpus)
  74 {
  75     return 0;
  76 }
  77
  78 int kvm_arch_init_vcpu(CPUState *env)
  79 {
  80     int ret = 0;
  81
  82     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
  83         perror("cannot init reset vcpu");
  84     }
  85
  86     return ret;
  87 }
  88
  89 void kvm_arch_reset_vcpu(CPUState *env)
  90 {
  91     /* FIXME: add code to reset vcpu. */
  92 }
  93
  94 int kvm_arch_put_registers(CPUState *env, int level)
  95 {
  96     struct kvm_regs regs;
  97     int ret;
  98     int i;
  99
 100     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 101     if (ret < 0) {
 102         return ret;
 103     }
 104
 105     for (i = 0; i < 16; i++) {
 106         regs.gprs[i] = env->regs[i];
 107     }
 108
 109     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 110     if (ret < 0) {
 111         return ret;
 112     }
 113
 114     env->kvm_run->psw_addr = env->psw.addr;
 115     env->kvm_run->psw_mask = env->psw.mask;
 116
 117     return ret;
 118 }
 119
 120 int kvm_arch_get_registers(CPUState *env)
 121 {
 122     uint32_t ret;
 123     struct kvm_regs regs;
 124     int i;
 125
 126     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 127     if (ret < 0) {
 128         return ret;
 129     }
 130
 131     for (i = 0; i < 16; i++) {
 132         env->regs[i] = regs.gprs[i];
 133     }
 134
 135     env->psw.addr = env->kvm_run->psw_addr;
 136     env->psw.mask = env->kvm_run->psw_mask;
 137
 138     return 0;
 139 }
 140
 141 int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 142 {
 143     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 144
 145     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
 146         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
 147         return -EINVAL;
 148     }
 149     return 0;
 150 }
 151
 152 int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 153 {
 154     uint8_t t[4];
 155     static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
 156
 157     if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
 158         return -EINVAL;
 159     } else if (memcmp(t, diag_501, 4)) {
 160         return -EINVAL;
 161     } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
 162         return -EINVAL;
 163     }
 164
 165     return 0;
 166 }
 167
 168 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 169 {
 170     return 0;
 171 }
 172
 173 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 174 {
 175     return 0;
 176 }
 177
 178 int kvm_arch_process_irqchip_events(CPUState *env)
 179 {
 180     return 0;
 181 }
 182
 183 static void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
 184                                         uint64_t parm64, int vm)
 185 {
 186     struct kvm_s390_interrupt kvmint;
 187     int r;
 188
 189     if (!env->kvm_state) {
 190         return;
 191     }
 192
 193     env->halted = 0;
 194     env->exception_index = -1;
 195
 196     kvmint.type = type;
 197     kvmint.parm = parm;
 198     kvmint.parm64 = parm64;
 199
 200     if (vm) {
 201         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 202     } else {
 203         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
 204     }
 205
 206     if (r < 0) {
 207         fprintf(stderr, "KVM failed to inject interrupt\n");
 208         exit(1);
 209     }
 210 }
 211
 212 void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
 213 {
 214     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
 215                                 token, 1);
 216 }
 217
 218 static void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
 219 {
 220     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 221 }
 222
 223 static void enter_pgmcheck(CPUState *env, uint16_t code)
 224 {
 225     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 226 }
 227
 228 static void setcc(CPUState *env, uint64_t cc)
 229 {
 230     env->kvm_run->psw_mask &= ~(3ul << 44);
 231     env->kvm_run->psw_mask |= (cc & 3) << 44;
 232
 233     env->psw.mask &= ~(3ul << 44);
 234     env->psw.mask |= (cc & 3) << 44;
 235 }
 236
 237 static int sclp_service_call(CPUState *env, struct kvm_run *run, uint16_t ipbh0)
 238 {
 239     uint32_t sccb;
 240     uint64_t code;
 241     int r = 0;
 242
 243     cpu_synchronize_state(env);
 244     sccb = env->regs[ipbh0 & 0xf];
 245     code = env->regs[(ipbh0 & 0xf0) >> 4];
 246
 247     dprintf("sclp(0x%x, 0x%lx)\n", sccb, code);
 248
 249     if (sccb & ~0x7ffffff8ul) {
 250         fprintf(stderr, "KVM: invalid sccb address 0x%x\n", sccb);
 251         r = -1;
 252         goto out;
 253     }
 254
 255     switch(code) {
 256         case SCLP_CMDW_READ_SCP_INFO:
 257         case SCLP_CMDW_READ_SCP_INFO_FORCED:
 258             stw_phys(sccb + SCP_MEM_CODE, ram_size >> 20);
 259             stb_phys(sccb + SCP_INCREMENT, 1);
 260             stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);
 261             setcc(env, 0);
 262
 263             kvm_s390_interrupt_internal(env, KVM_S390_INT_SERVICE,
 264                                         sccb & ~3, 0, 1);
 265             break;
 266         default:
 267             dprintf("KVM: invalid sclp call 0x%x / 0x%lx\n", sccb, code);
 268             r = -1;
 269             break;
 270     }
 271
 272 out:
 273     if (r < 0) {
 274         setcc(env, 3);
 275     }
 276     return 0;
 277 }
 278
 279 static int handle_priv(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 280 {
 281     int r = 0;
 282     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 283
 284     dprintf("KVM: PRIV: %d\n", ipa1);
 285     switch (ipa1) {
 286         case PRIV_SCLP_CALL:
 287             r = sclp_service_call(env, run, ipbh0);
 288             break;
 289         default:
 290             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 291             r = -1;
 292             break;
 293     }
 294
 295     return r;
 296 }
 297
 298 static int handle_hypercall(CPUState *env, struct kvm_run *run)
 299 {
 300     int r;
 301
 302     cpu_synchronize_state(env);
 303     r = s390_virtio_hypercall(env);
 304
 305     return r;
 306 }
 307
 308 static int handle_diag(CPUState *env, struct kvm_run *run, int ipb_code)
 309 {
 310     int r = 0;
 311
 312     switch (ipb_code) {
 313         case DIAG_KVM_HYPERCALL:
 314             r = handle_hypercall(env, run);
 315             break;
 316         case DIAG_KVM_BREAKPOINT:
 317             sleep(10);
 318             break;
 319         default:
 320             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 321             r = -1;
 322             break;
 323     }
 324
 325     return r;
 326 }
 327
 328 static int s390_cpu_restart(CPUState *env)
 329 {
 330     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
 331     env->halted = 0;
 332     env->exception_index = -1;
 333     qemu_cpu_kick(env);
 334     dprintf("DONE: SIGP cpu restart: %p\n", env);
 335     return 0;
 336 }
 337
 338 static int s390_store_status(CPUState *env, uint32_t parameter)
 339 {
 340     /* XXX */
 341     fprintf(stderr, "XXX SIGP store status\n");
 342     return -1;
 343 }
 344
 345 static int s390_cpu_initial_reset(CPUState *env)
 346 {
 347     int i;
 348
 349     if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
 350         perror("cannot init reset vcpu");
 351     }
 352
 353     /* Manually zero out all registers */
 354     cpu_synchronize_state(env);
 355     for (i = 0; i < 16; i++) {
 356         env->regs[i] = 0;
 357     }
 358
 359     dprintf("DONE: SIGP initial reset: %p\n", env);
 360     return 0;
 361 }
 362
 363 static int handle_sigp(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 364 {
 365     uint8_t order_code;
 366     uint32_t parameter;
 367     uint16_t cpu_addr;
 368     uint8_t t;
 369     int r = -1;
 370     CPUState *target_env;
 371
 372     cpu_synchronize_state(env);
 373
 374     /* get order code */
 375     order_code = run->s390_sieic.ipb >> 28;
 376     if (order_code > 0) {
 377         order_code = env->regs[order_code];
 378     }
 379     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 380
 381     /* get parameters */
 382     t = (ipa1 & 0xf0) >> 4;
 383     if (!(t % 2)) {
 384         t++;
 385     }
 386
 387     parameter = env->regs[t] & 0x7ffffe00;
 388     cpu_addr = env->regs[ipa1 & 0x0f];
 389
 390     target_env = s390_cpu_addr2state(cpu_addr);
 391     if (!target_env) {
 392         goto out;
 393     }
 394
 395     switch (order_code) {
 396         case SIGP_RESTART:
 397             r = s390_cpu_restart(target_env);
 398             break;
 399         case SIGP_STORE_STATUS_ADDR:
 400             r = s390_store_status(target_env, parameter);
 401             break;
 402         case SIGP_SET_ARCH:
 403             /* make the caller panic */
 404             return -1;
 405         case SIGP_INITIAL_CPU_RESET:
 406             r = s390_cpu_initial_reset(target_env);
 407             break;
 408         default:
 409             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", ipa1);
 410             break;
 411     }
 412
 413 out:
 414     setcc(env, r ? 3 : 0);
 415     return 0;
 416 }
 417
 418 static int handle_instruction(CPUState *env, struct kvm_run *run)
 419 {
 420     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 421     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 422     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 423     int r = -1;
 424
 425     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 426     switch (ipa0) {
 427         case IPA0_PRIV:
 428             r = handle_priv(env, run, ipa1);
 429             break;
 430         case IPA0_DIAG:
 431             r = handle_diag(env, run, ipb_code);
 432             break;
 433         case IPA0_SIGP:
 434             r = handle_sigp(env, run, ipa1);
 435             break;
 436     }
 437
 438     if (r < 0) {
 439         enter_pgmcheck(env, 0x0001);
 440     }
 441     return r;
 442 }
 443
 444 static int handle_intercept(CPUState *env)
 445 {
 446     struct kvm_run *run = env->kvm_run;
 447     int icpt_code = run->s390_sieic.icptcode;
 448     int r = 0;
 449
 450     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code, env->kvm_run->psw_addr);
 451     switch (icpt_code) {
 452         case ICPT_INSTRUCTION:
 453             r = handle_instruction(env, run);
 454             break;
 455         case ICPT_WAITPSW:
 456             /* XXX What to do on system shutdown? */
 457             env->halted = 1;
 458             env->exception_index = EXCP_HLT;
 459             break;
 460         case ICPT_SOFT_INTERCEPT:
 461             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 462             exit(1);
 463             break;
 464         case ICPT_CPU_STOP:
 465             qemu_system_shutdown_request();
 466             break;
 467         case ICPT_IO:
 468             fprintf(stderr, "KVM unimplemented icpt IO\n");
 469             exit(1);
 470             break;
 471         default:
 472             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 473             exit(1);
 474             break;
 475     }
 476
 477     return r;
 478 }
 479
 480 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 481 {
 482     int ret = 0;
 483
 484     switch (run->exit_reason) {
 485         case KVM_EXIT_S390_SIEIC:
 486             ret = handle_intercept(env);
 487             break;
 488         case KVM_EXIT_S390_RESET:
 489             fprintf(stderr, "RESET not implemented\n");
 490             exit(1);
 491             break;
 492         default:
 493             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 494             break;
 495     }
 496
 497     return ret;
 498 }
 499
 500 bool kvm_arch_stop_on_emulation_error(CPUState *env)
 501 {
 502     return true;
 503 }