1 /* 2 * SCLP Support 3 * 4 * Copyright IBM, Corp. 2012 5 * 6 * Authors: 7 * Christian Borntraeger <borntraeger@de.ibm.com> 8 * Heinz Graalfs <graalfs@linux.vnet.ibm.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or (at your 11 * option) any later version. See the COPYING file in the top-level directory. 12 * 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu/units.h" 17 #include "qapi/error.h" 18 #include "hw/boards.h" 19 #include "hw/s390x/sclp.h" 20 #include "hw/s390x/event-facility.h" 21 #include "hw/s390x/s390-pci-bus.h" 22 #include "hw/s390x/ipl.h" 23 #include "hw/s390x/cpu-topology.h" 24 25 static inline SCLPDevice *get_sclp_device(void) 26 { 27 static SCLPDevice *sclp; 28 29 if (!sclp) { 30 sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL)); 31 } 32 return sclp; 33 } 34 35 static inline bool sclp_command_code_valid(uint32_t code) 36 { 37 switch (code & SCLP_CMD_CODE_MASK) { 38 case SCLP_CMDW_READ_SCP_INFO: 39 case SCLP_CMDW_READ_SCP_INFO_FORCED: 40 case SCLP_CMDW_READ_CPU_INFO: 41 case SCLP_CMDW_CONFIGURE_IOA: 42 case SCLP_CMDW_DECONFIGURE_IOA: 43 case SCLP_CMD_READ_EVENT_DATA: 44 case SCLP_CMD_WRITE_EVENT_DATA: 45 case SCLP_CMD_WRITE_EVENT_MASK: 46 return true; 47 } 48 return false; 49 } 50 51 static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t sccb_len, 52 uint32_t code) 53 { 54 uint64_t sccb_max_addr = sccb_addr + sccb_len - 1; 55 uint64_t sccb_boundary = (sccb_addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; 56 57 switch (code & SCLP_CMD_CODE_MASK) { 58 case SCLP_CMDW_READ_SCP_INFO: 59 case SCLP_CMDW_READ_SCP_INFO_FORCED: 60 case SCLP_CMDW_READ_CPU_INFO: 61 /* 62 * An extended-length SCCB is only allowed for Read SCP/CPU Info and 63 * is allowed to exceed the 4k boundary. The respective commands will 64 * set the length field to the required length if an insufficient 65 * SCCB length is provided. 66 */ 67 if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { 68 return true; 69 } 70 /* fallthrough */ 71 default: 72 if (sccb_max_addr < sccb_boundary) { 73 return true; 74 } 75 } 76 77 return false; 78 } 79 80 static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count) 81 { 82 uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 }; 83 int i; 84 85 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features); 86 for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) { 87 if (!ms->possible_cpus->cpus[i].cpu) { 88 continue; 89 } 90 entry[*count].address = ms->possible_cpus->cpus[i].arch_id; 91 entry[*count].type = 0; 92 memcpy(entry[*count].features, features, sizeof(features)); 93 (*count)++; 94 } 95 } 96 97 #define SCCB_REQ_LEN(s, max_cpus) (sizeof(s) + max_cpus * sizeof(CPUEntry)) 98 99 static inline bool ext_len_sccb_supported(SCCBHeader header) 100 { 101 return s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) && 102 header.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE; 103 } 104 105 /* Provide information about the configuration, CPUs and storage */ 106 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) 107 { 108 ReadInfo *read_info = (ReadInfo *) sccb; 109 MachineState *machine = MACHINE(qdev_get_machine()); 110 int cpu_count; 111 int rnsize, rnmax; 112 IplParameterBlock *ipib = s390_ipl_get_iplb(); 113 int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len); 114 int offset_cpu = s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) ? 115 offsetof(ReadInfo, entries) : 116 SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET; 117 CPUEntry *entries_start = (void *)sccb + offset_cpu; 118 119 if (be16_to_cpu(sccb->h.length) < required_len) { 120 if (ext_len_sccb_supported(sccb->h)) { 121 sccb->h.length = cpu_to_be16(required_len); 122 } 123 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); 124 return; 125 } 126 127 if (s390_has_topology()) { 128 read_info->stsi_parm = SCLP_READ_SCP_INFO_MNEST; 129 } 130 131 /* CPU information */ 132 prepare_cpu_entries(machine, entries_start, &cpu_count); 133 read_info->entries_cpu = cpu_to_be16(cpu_count); 134 read_info->offset_cpu = cpu_to_be16(offset_cpu); 135 read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1); 136 137 read_info->ibc_val = cpu_to_be32(s390_get_ibc_val()); 138 139 /* Configuration Characteristic (Extension) */ 140 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR, 141 read_info->conf_char); 142 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT, 143 read_info->conf_char_ext); 144 145 if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { 146 s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134, 147 &read_info->fac134); 148 } 149 150 read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO | 151 SCLP_HAS_IOA_RECONFIG); 152 153 read_info->mha_pow = s390_get_mha_pow(); 154 read_info->hmfai = cpu_to_be32(s390_get_hmfai()); 155 156 rnsize = 1 << (sclp->increment_size - 20); 157 if (rnsize <= 128) { 158 read_info->rnsize = rnsize; 159 } else { 160 read_info->rnsize = 0; 161 read_info->rnsize2 = cpu_to_be32(rnsize); 162 } 163 164 /* we don't support standby memory, maxram_size is never exposed */ 165 rnmax = machine->ram_size >> sclp->increment_size; 166 if (rnmax < 0x10000) { 167 read_info->rnmax = cpu_to_be16(rnmax); 168 } else { 169 read_info->rnmax = cpu_to_be16(0); 170 read_info->rnmax2 = cpu_to_be64(rnmax); 171 } 172 173 if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) { 174 memcpy(&read_info->loadparm, &ipib->loadparm, 175 sizeof(read_info->loadparm)); 176 } else { 177 s390_ipl_set_loadparm(read_info->loadparm); 178 } 179 180 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 181 } 182 183 /* Provide information about the CPU */ 184 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb) 185 { 186 MachineState *machine = MACHINE(qdev_get_machine()); 187 ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb; 188 int cpu_count; 189 int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len); 190 191 if (be16_to_cpu(sccb->h.length) < required_len) { 192 if (ext_len_sccb_supported(sccb->h)) { 193 sccb->h.length = cpu_to_be16(required_len); 194 } 195 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); 196 return; 197 } 198 199 prepare_cpu_entries(machine, cpu_info->entries, &cpu_count); 200 cpu_info->nr_configured = cpu_to_be16(cpu_count); 201 cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries)); 202 cpu_info->nr_standby = cpu_to_be16(0); 203 204 /* The standby offset is 16-byte for each CPU */ 205 cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured 206 + cpu_info->nr_configured*sizeof(CPUEntry)); 207 208 209 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 210 } 211 212 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb, 213 bool configure) 214 { 215 int rc; 216 217 if (be16_to_cpu(sccb->h.length) < 16) { 218 rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH; 219 goto out_err; 220 } 221 222 switch (((IoaCfgSccb *)sccb)->atype) { 223 case SCLP_RECONFIG_PCI_ATYPE: 224 if (s390_has_feat(S390_FEAT_ZPCI)) { 225 if (configure) { 226 s390_pci_sclp_configure(sccb); 227 } else { 228 s390_pci_sclp_deconfigure(sccb); 229 } 230 return; 231 } 232 /* fallthrough */ 233 default: 234 rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED; 235 } 236 237 out_err: 238 sccb->h.response_code = cpu_to_be16(rc); 239 } 240 241 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) 242 { 243 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 244 SCLPEventFacility *ef = sclp->event_facility; 245 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 246 247 switch (code & SCLP_CMD_CODE_MASK) { 248 case SCLP_CMDW_READ_SCP_INFO: 249 case SCLP_CMDW_READ_SCP_INFO_FORCED: 250 sclp_c->read_SCP_info(sclp, sccb); 251 break; 252 case SCLP_CMDW_READ_CPU_INFO: 253 sclp_c->read_cpu_info(sclp, sccb); 254 break; 255 case SCLP_CMDW_CONFIGURE_IOA: 256 sclp_configure_io_adapter(sclp, sccb, true); 257 break; 258 case SCLP_CMDW_DECONFIGURE_IOA: 259 sclp_configure_io_adapter(sclp, sccb, false); 260 break; 261 default: 262 efc->command_handler(ef, sccb, code); 263 break; 264 } 265 } 266 267 /* 268 * We only need the address to have something valid for the 269 * service_interrupt call. 270 */ 271 #define SCLP_PV_DUMMY_ADDR 0x4000 272 int sclp_service_call_protected(S390CPU *cpu, uint64_t sccb, uint32_t code) 273 { 274 CPUS390XState *env = &cpu->env; 275 SCLPDevice *sclp = get_sclp_device(); 276 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 277 SCCBHeader header; 278 g_autofree SCCB *work_sccb = NULL; 279 280 s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader)); 281 282 work_sccb = g_malloc0(be16_to_cpu(header.length)); 283 s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb, 284 be16_to_cpu(header.length)); 285 286 if (!sclp_command_code_valid(code)) { 287 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 288 goto out_write; 289 } 290 291 sclp_c->execute(sclp, work_sccb, code); 292 out_write: 293 s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb, 294 be16_to_cpu(work_sccb->h.length)); 295 sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); 296 return 0; 297 } 298 299 int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code) 300 { 301 CPUS390XState *env = &cpu->env; 302 SCLPDevice *sclp = get_sclp_device(); 303 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 304 SCCBHeader header; 305 g_autofree SCCB *work_sccb = NULL; 306 307 /* first some basic checks on program checks */ 308 if (env->psw.mask & PSW_MASK_PSTATE) { 309 return -PGM_PRIVILEGED; 310 } 311 if (cpu_physical_memory_is_io(sccb)) { 312 return -PGM_ADDRESSING; 313 } 314 if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa 315 || (sccb & ~0x7ffffff8UL) != 0) { 316 return -PGM_SPECIFICATION; 317 } 318 319 /* the header contains the actual length of the sccb */ 320 cpu_physical_memory_read(sccb, &header, sizeof(SCCBHeader)); 321 322 /* Valid sccb sizes */ 323 if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) { 324 return -PGM_SPECIFICATION; 325 } 326 327 /* 328 * we want to work on a private copy of the sccb, to prevent guests 329 * from playing dirty tricks by modifying the memory content after 330 * the host has checked the values 331 */ 332 work_sccb = g_malloc0(be16_to_cpu(header.length)); 333 cpu_physical_memory_read(sccb, work_sccb, be16_to_cpu(header.length)); 334 335 if (!sclp_command_code_valid(code)) { 336 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 337 goto out_write; 338 } 339 340 if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) { 341 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); 342 goto out_write; 343 } 344 345 sclp_c->execute(sclp, work_sccb, code); 346 out_write: 347 cpu_physical_memory_write(sccb, work_sccb, 348 be16_to_cpu(work_sccb->h.length)); 349 350 sclp_c->service_interrupt(sclp, sccb); 351 352 return 0; 353 } 354 355 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb) 356 { 357 SCLPEventFacility *ef = sclp->event_facility; 358 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 359 360 uint32_t param = sccb & ~3; 361 362 /* Indicate whether an event is still pending */ 363 param |= efc->event_pending(ef) ? 1 : 0; 364 365 if (!param) { 366 /* No need to send an interrupt, there's nothing to be notified about */ 367 return; 368 } 369 s390_sclp_extint(param); 370 } 371 372 void sclp_service_interrupt(uint32_t sccb) 373 { 374 SCLPDevice *sclp = get_sclp_device(); 375 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 376 377 sclp_c->service_interrupt(sclp, sccb); 378 } 379 380 /* qemu object creation and initialization functions */ 381 382 void s390_sclp_init(void) 383 { 384 Object *new = object_new(TYPE_SCLP); 385 386 object_property_add_child(qdev_get_machine(), TYPE_SCLP, new); 387 object_unref(new); 388 qdev_realize(DEVICE(new), NULL, &error_fatal); 389 } 390 391 static void sclp_realize(DeviceState *dev, Error **errp) 392 { 393 MachineState *machine = MACHINE(qdev_get_machine()); 394 SCLPDevice *sclp = SCLP(dev); 395 uint64_t hw_limit; 396 int ret; 397 398 /* 399 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long 400 * as we can't find a fitting bus via the qom tree, we have to add the 401 * event facility to the sysbus, so e.g. a sclp console can be created. 402 */ 403 if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) { 404 return; 405 } 406 407 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit); 408 if (ret == -E2BIG) { 409 error_setg(errp, "host supports a maximum of %" PRIu64 " GB", 410 hw_limit / GiB); 411 } else if (ret) { 412 error_setg(errp, "setting the guest size failed"); 413 } 414 } 415 416 static void sclp_memory_init(SCLPDevice *sclp) 417 { 418 MachineState *machine = MACHINE(qdev_get_machine()); 419 MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine()); 420 ram_addr_t initial_mem = machine->ram_size; 421 int increment_size = 20; 422 423 /* The storage increment size is a multiple of 1M and is a power of 2. 424 * For some machine types, the number of storage increments must be 425 * MAX_STORAGE_INCREMENTS or fewer. 426 * The variable 'increment_size' is an exponent of 2 that can be 427 * used to calculate the size (in bytes) of an increment. */ 428 while (machine_class->fixup_ram_size != NULL && 429 (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) { 430 increment_size++; 431 } 432 sclp->increment_size = increment_size; 433 } 434 435 static void sclp_init(Object *obj) 436 { 437 SCLPDevice *sclp = SCLP(obj); 438 Object *new; 439 440 new = object_new(TYPE_SCLP_EVENT_FACILITY); 441 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new); 442 object_unref(new); 443 sclp->event_facility = EVENT_FACILITY(new); 444 445 sclp_memory_init(sclp); 446 } 447 448 static void sclp_class_init(ObjectClass *oc, void *data) 449 { 450 SCLPDeviceClass *sc = SCLP_CLASS(oc); 451 DeviceClass *dc = DEVICE_CLASS(oc); 452 453 dc->desc = "SCLP (Service-Call Logical Processor)"; 454 dc->realize = sclp_realize; 455 dc->hotpluggable = false; 456 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 457 /* 458 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init 459 * which is a non-pluggable sysbus device 460 */ 461 dc->user_creatable = false; 462 463 sc->read_SCP_info = read_SCP_info; 464 sc->read_cpu_info = sclp_read_cpu_info; 465 sc->execute = sclp_execute; 466 sc->service_interrupt = service_interrupt; 467 } 468 469 static const TypeInfo sclp_info = { 470 .name = TYPE_SCLP, 471 .parent = TYPE_DEVICE, 472 .instance_init = sclp_init, 473 .instance_size = sizeof(SCLPDevice), 474 .class_init = sclp_class_init, 475 .class_size = sizeof(SCLPDeviceClass), 476 }; 477 478 static void register_types(void) 479 { 480 type_register_static(&sclp_info); 481 } 482 type_init(register_types); 483