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)
  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 static 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 = 0;
 190
 191     kvmint.type = type;
 192     kvmint.parm = parm;
 193     kvmint.parm64 = parm64;
 194
 195     if (vm) {
 196         r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
 197     } else {
 198         r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
 199     }
 200
 201     if (r < 0) {
 202         fprintf(stderr, "KVM failed to inject interrupt\n");
 203         exit(1);
 204     }
 205 }
 206
 207 void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
 208 {
 209     kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
 210                                 token, 1);
 211 }
 212
 213 static void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
 214 {
 215     kvm_s390_interrupt_internal(env, type, code, 0, 0);
 216 }
 217
 218 static void enter_pgmcheck(CPUState *env, uint16_t code)
 219 {
 220     kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
 221 }
 222
 223 static void setcc(CPUState *env, uint64_t cc)
 224 {
 225     env->kvm_run->psw_mask &= ~(3ul << 44);
 226     env->kvm_run->psw_mask |= (cc & 3) << 44;
 227
 228     env->psw.mask &= ~(3ul << 44);
 229     env->psw.mask |= (cc & 3) << 44;
 230 }
 231
 232 static int sclp_service_call(CPUState *env, struct kvm_run *run, uint16_t ipbh0)
 233 {
 234     uint32_t sccb;
 235     uint64_t code;
 236     int r = 0;
 237
 238     cpu_synchronize_state(env);
 239     sccb = env->regs[ipbh0 & 0xf];
 240     code = env->regs[(ipbh0 & 0xf0) >> 4];
 241
 242     dprintf("sclp(0x%x, 0x%lx)\n", sccb, code);
 243
 244     if (sccb & ~0x7ffffff8ul) {
 245         fprintf(stderr, "KVM: invalid sccb address 0x%x\n", sccb);
 246         r = -1;
 247         goto out;
 248     }
 249
 250     switch(code) {
 251         case SCLP_CMDW_READ_SCP_INFO:
 252         case SCLP_CMDW_READ_SCP_INFO_FORCED:
 253             stw_phys(sccb + SCP_MEM_CODE, ram_size >> 20);
 254             stb_phys(sccb + SCP_INCREMENT, 1);
 255             stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);
 256             setcc(env, 0);
 257
 258             kvm_s390_interrupt_internal(env, KVM_S390_INT_SERVICE,
 259                                         sccb & ~3, 0, 1);
 260             break;
 261         default:
 262             dprintf("KVM: invalid sclp call 0x%x / 0x%lx\n", sccb, code);
 263             r = -1;
 264             break;
 265     }
 266
 267 out:
 268     if (r < 0) {
 269         setcc(env, 3);
 270     }
 271     return 0;
 272 }
 273
 274 static int handle_priv(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 275 {
 276     int r = 0;
 277     uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
 278
 279     dprintf("KVM: PRIV: %d\n", ipa1);
 280     switch (ipa1) {
 281         case PRIV_SCLP_CALL:
 282             r = sclp_service_call(env, run, ipbh0);
 283             break;
 284         default:
 285             dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
 286             r = -1;
 287             break;
 288     }
 289
 290     return r;
 291 }
 292
 293 static int handle_hypercall(CPUState *env, struct kvm_run *run)
 294 {
 295     int r;
 296
 297     cpu_synchronize_state(env);
 298     r = s390_virtio_hypercall(env);
 299     kvm_arch_put_registers(env);
 300
 301     return r;
 302 }
 303
 304 static int handle_diag(CPUState *env, struct kvm_run *run, int ipb_code)
 305 {
 306     int r = 0;
 307
 308     switch (ipb_code) {
 309         case DIAG_KVM_HYPERCALL:
 310             r = handle_hypercall(env, run);
 311             break;
 312         case DIAG_KVM_BREAKPOINT:
 313             sleep(10);
 314             break;
 315         default:
 316             dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
 317             r = -1;
 318             break;
 319     }
 320
 321     return r;
 322 }
 323
 324 static int s390_cpu_restart(CPUState *env)
 325 {
 326     kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
 327     env->halted = 0;
 328     env->exception_index = 0;
 329     qemu_cpu_kick(env);
 330     dprintf("DONE: SIGP cpu restart: %p\n", env);
 331     return 0;
 332 }
 333
 334 static int s390_store_status(CPUState *env, uint32_t parameter)
 335 {
 336     /* XXX */
 337     fprintf(stderr, "XXX SIGP store status\n");
 338     return -1;
 339 }
 340
 341 static int s390_cpu_initial_reset(CPUState *env)
 342 {
 343     /* XXX */
 344     fprintf(stderr, "XXX SIGP init\n");
 345     return -1;
 346 }
 347
 348 static int handle_sigp(CPUState *env, struct kvm_run *run, uint8_t ipa1)
 349 {
 350     uint8_t order_code;
 351     uint32_t parameter;
 352     uint16_t cpu_addr;
 353     uint8_t t;
 354     int r = -1;
 355     CPUState *target_env;
 356
 357     cpu_synchronize_state(env);
 358
 359     /* get order code */
 360     order_code = run->s390_sieic.ipb >> 28;
 361     if (order_code > 0) {
 362         order_code = env->regs[order_code];
 363     }
 364     order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 365
 366     /* get parameters */
 367     t = (ipa1 & 0xf0) >> 4;
 368     if (!(t % 2)) {
 369         t++;
 370     }
 371
 372     parameter = env->regs[t] & 0x7ffffe00;
 373     cpu_addr = env->regs[ipa1 & 0x0f];
 374
 375     target_env = s390_cpu_addr2state(cpu_addr);
 376     if (!target_env) {
 377         goto out;
 378     }
 379
 380     switch (order_code) {
 381         case SIGP_RESTART:
 382             r = s390_cpu_restart(target_env);
 383             break;
 384         case SIGP_STORE_STATUS_ADDR:
 385             r = s390_store_status(target_env, parameter);
 386             break;
 387         case SIGP_SET_ARCH:
 388             /* make the caller panic */
 389             return -1;
 390         case SIGP_INITIAL_CPU_RESET:
 391             r = s390_cpu_initial_reset(target_env);
 392             break;
 393         default:
 394             fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", ipa1);
 395             break;
 396     }
 397
 398 out:
 399     setcc(env, r ? 3 : 0);
 400     return 0;
 401 }
 402
 403 static int handle_instruction(CPUState *env, struct kvm_run *run)
 404 {
 405     unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
 406     uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
 407     int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
 408     int r = -1;
 409
 410     dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
 411     switch (ipa0) {
 412         case IPA0_PRIV:
 413             r = handle_priv(env, run, ipa1);
 414             break;
 415         case IPA0_DIAG:
 416             r = handle_diag(env, run, ipb_code);
 417             break;
 418         case IPA0_SIGP:
 419             r = handle_sigp(env, run, ipa1);
 420             break;
 421     }
 422
 423     if (r < 0) {
 424         enter_pgmcheck(env, 0x0001);
 425     }
 426     return r;
 427 }
 428
 429 static int handle_intercept(CPUState *env)
 430 {
 431     struct kvm_run *run = env->kvm_run;
 432     int icpt_code = run->s390_sieic.icptcode;
 433     int r = 0;
 434
 435     dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code, env->kvm_run->psw_addr);
 436     switch (icpt_code) {
 437         case ICPT_INSTRUCTION:
 438             r = handle_instruction(env, run);
 439             break;
 440         case ICPT_WAITPSW:
 441             /* XXX What to do on system shutdown? */
 442             env->halted = 1;
 443             env->exception_index = EXCP_HLT;
 444             break;
 445         case ICPT_SOFT_INTERCEPT:
 446             fprintf(stderr, "KVM unimplemented icpt SOFT\n");
 447             exit(1);
 448             break;
 449         case ICPT_CPU_STOP:
 450             qemu_system_shutdown_request();
 451             break;
 452         case ICPT_IO:
 453             fprintf(stderr, "KVM unimplemented icpt IO\n");
 454             exit(1);
 455             break;
 456         default:
 457             fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
 458             exit(1);
 459             break;
 460     }
 461
 462     return r;
 463 }
 464
 465 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 466 {
 467     int ret = 0;
 468
 469     switch (run->exit_reason) {
 470         case KVM_EXIT_S390_SIEIC:
 471             ret = handle_intercept(env);
 472             break;
 473         case KVM_EXIT_S390_RESET:
 474             fprintf(stderr, "RESET not implemented\n");
 475             exit(1);
 476             break;
 477         default:
 478             fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
 479             break;
 480     }
 481
 482     return ret;
 483 }