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