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 #include "hw/s390x/s390-virtio-ccw.h" 25 26 static SCLPDevice *get_sclp_device(void) 27 { 28 static SCLPDevice *sclp; 29 30 if (!sclp) { 31 sclp = S390_CCW_MACHINE(qdev_get_machine())->sclp; 32 } 33 return sclp; 34 } 35 36 static inline bool sclp_command_code_valid(uint32_t code) 37 { 38 switch (code & SCLP_CMD_CODE_MASK) { 39 case SCLP_CMDW_READ_SCP_INFO: 40 case SCLP_CMDW_READ_SCP_INFO_FORCED: 41 case SCLP_CMDW_READ_CPU_INFO: 42 case SCLP_CMDW_CONFIGURE_IOA: 43 case SCLP_CMDW_DECONFIGURE_IOA: 44 case SCLP_CMD_READ_EVENT_DATA: 45 case SCLP_CMD_WRITE_EVENT_DATA: 46 case SCLP_CMD_WRITE_EVENT_MASK: 47 return true; 48 } 49 return false; 50 } 51 52 static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t sccb_len, 53 uint32_t code) 54 { 55 uint64_t sccb_max_addr = sccb_addr + sccb_len - 1; 56 uint64_t sccb_boundary = (sccb_addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; 57 58 switch (code & SCLP_CMD_CODE_MASK) { 59 case SCLP_CMDW_READ_SCP_INFO: 60 case SCLP_CMDW_READ_SCP_INFO_FORCED: 61 case SCLP_CMDW_READ_CPU_INFO: 62 /* 63 * An extended-length SCCB is only allowed for Read SCP/CPU Info and 64 * is allowed to exceed the 4k boundary. The respective commands will 65 * set the length field to the required length if an insufficient 66 * SCCB length is provided. 67 */ 68 if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { 69 return true; 70 } 71 /* fallthrough */ 72 default: 73 if (sccb_max_addr < sccb_boundary) { 74 return true; 75 } 76 } 77 78 return false; 79 } 80 81 static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count) 82 { 83 uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 }; 84 int i; 85 86 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features); 87 for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) { 88 if (!ms->possible_cpus->cpus[i].cpu) { 89 continue; 90 } 91 entry[*count].address = ms->possible_cpus->cpus[i].arch_id; 92 entry[*count].type = 0; 93 memcpy(entry[*count].features, features, sizeof(features)); 94 (*count)++; 95 } 96 } 97 98 #define SCCB_REQ_LEN(s, max_cpus) (sizeof(s) + max_cpus * sizeof(CPUEntry)) 99 100 static inline bool ext_len_sccb_supported(SCCBHeader header) 101 { 102 return s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) && 103 header.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE; 104 } 105 106 /* Provide information about the configuration, CPUs and storage */ 107 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) 108 { 109 ReadInfo *read_info = (ReadInfo *) sccb; 110 MachineState *machine = MACHINE(qdev_get_machine()); 111 int cpu_count; 112 int rnsize, rnmax; 113 IplParameterBlock *ipib = s390_ipl_get_iplb(); 114 int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len); 115 int offset_cpu = s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) ? 116 offsetof(ReadInfo, entries) : 117 SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET; 118 CPUEntry *entries_start = (void *)sccb + offset_cpu; 119 120 if (be16_to_cpu(sccb->h.length) < required_len) { 121 if (ext_len_sccb_supported(sccb->h)) { 122 sccb->h.length = cpu_to_be16(required_len); 123 } 124 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); 125 return; 126 } 127 128 if (s390_has_topology()) { 129 read_info->stsi_parm = SCLP_READ_SCP_INFO_MNEST; 130 } 131 132 /* CPU information */ 133 prepare_cpu_entries(machine, entries_start, &cpu_count); 134 read_info->entries_cpu = cpu_to_be16(cpu_count); 135 read_info->offset_cpu = cpu_to_be16(offset_cpu); 136 read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1); 137 138 read_info->ibc_val = cpu_to_be32(s390_get_ibc_val()); 139 140 /* Configuration Characteristic (Extension) */ 141 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR, 142 read_info->conf_char); 143 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT, 144 read_info->conf_char_ext); 145 146 if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { 147 s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134, 148 &read_info->fac134); 149 } 150 151 read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO | 152 SCLP_HAS_IOA_RECONFIG); 153 154 read_info->mha_pow = s390_get_mha_pow(); 155 read_info->hmfai = cpu_to_be32(s390_get_hmfai()); 156 157 rnsize = 1 << (sclp->increment_size - 20); 158 if (rnsize <= 128) { 159 read_info->rnsize = rnsize; 160 } else { 161 read_info->rnsize = 0; 162 read_info->rnsize2 = cpu_to_be32(rnsize); 163 } 164 165 /* we don't support standby memory, maxram_size is never exposed */ 166 rnmax = machine->ram_size >> sclp->increment_size; 167 if (rnmax < 0x10000) { 168 read_info->rnmax = cpu_to_be16(rnmax); 169 } else { 170 read_info->rnmax = cpu_to_be16(0); 171 read_info->rnmax2 = cpu_to_be64(rnmax); 172 } 173 174 if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) { 175 memcpy(&read_info->loadparm, &ipib->loadparm, 176 sizeof(read_info->loadparm)); 177 } else { 178 s390_ipl_set_loadparm(read_info->loadparm); 179 } 180 181 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 182 } 183 184 /* Provide information about the CPU */ 185 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb) 186 { 187 MachineState *machine = MACHINE(qdev_get_machine()); 188 ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb; 189 int cpu_count; 190 int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len); 191 192 if (be16_to_cpu(sccb->h.length) < required_len) { 193 if (ext_len_sccb_supported(sccb->h)) { 194 sccb->h.length = cpu_to_be16(required_len); 195 } 196 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); 197 return; 198 } 199 200 prepare_cpu_entries(machine, cpu_info->entries, &cpu_count); 201 cpu_info->nr_configured = cpu_to_be16(cpu_count); 202 cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries)); 203 cpu_info->nr_standby = cpu_to_be16(0); 204 205 /* The standby offset is 16-byte for each CPU */ 206 cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured 207 + cpu_info->nr_configured*sizeof(CPUEntry)); 208 209 210 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 211 } 212 213 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb, 214 bool configure) 215 { 216 int rc; 217 218 if (be16_to_cpu(sccb->h.length) < 16) { 219 rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH; 220 goto out_err; 221 } 222 223 switch (((IoaCfgSccb *)sccb)->atype) { 224 case SCLP_RECONFIG_PCI_ATYPE: 225 if (s390_has_feat(S390_FEAT_ZPCI)) { 226 if (configure) { 227 s390_pci_sclp_configure(sccb); 228 } else { 229 s390_pci_sclp_deconfigure(sccb); 230 } 231 return; 232 } 233 /* fallthrough */ 234 default: 235 rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED; 236 } 237 238 out_err: 239 sccb->h.response_code = cpu_to_be16(rc); 240 } 241 242 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) 243 { 244 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 245 SCLPEventFacility *ef = sclp->event_facility; 246 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 247 248 switch (code & SCLP_CMD_CODE_MASK) { 249 case SCLP_CMDW_READ_SCP_INFO: 250 case SCLP_CMDW_READ_SCP_INFO_FORCED: 251 sclp_c->read_SCP_info(sclp, sccb); 252 break; 253 case SCLP_CMDW_READ_CPU_INFO: 254 sclp_c->read_cpu_info(sclp, sccb); 255 break; 256 case SCLP_CMDW_CONFIGURE_IOA: 257 sclp_configure_io_adapter(sclp, sccb, true); 258 break; 259 case SCLP_CMDW_DECONFIGURE_IOA: 260 sclp_configure_io_adapter(sclp, sccb, false); 261 break; 262 default: 263 efc->command_handler(ef, sccb, code); 264 break; 265 } 266 } 267 268 /* 269 * We only need the address to have something valid for the 270 * service_interrupt call. 271 */ 272 #define SCLP_PV_DUMMY_ADDR 0x4000 273 int sclp_service_call_protected(S390CPU *cpu, uint64_t sccb, uint32_t code) 274 { 275 CPUS390XState *env = &cpu->env; 276 SCLPDevice *sclp = get_sclp_device(); 277 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 278 SCCBHeader header; 279 g_autofree SCCB *work_sccb = NULL; 280 281 s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader)); 282 283 work_sccb = g_malloc0(be16_to_cpu(header.length)); 284 s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb, 285 be16_to_cpu(header.length)); 286 287 if (!sclp_command_code_valid(code)) { 288 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 289 goto out_write; 290 } 291 292 sclp_c->execute(sclp, work_sccb, code); 293 out_write: 294 s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb, 295 be16_to_cpu(work_sccb->h.length)); 296 sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); 297 return 0; 298 } 299 300 int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code) 301 { 302 CPUS390XState *env = &cpu->env; 303 SCLPDevice *sclp = get_sclp_device(); 304 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 305 SCCBHeader header; 306 g_autofree SCCB *work_sccb = NULL; 307 308 /* first some basic checks on program checks */ 309 if (env->psw.mask & PSW_MASK_PSTATE) { 310 return -PGM_PRIVILEGED; 311 } 312 if (cpu_physical_memory_is_io(sccb)) { 313 return -PGM_ADDRESSING; 314 } 315 if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa 316 || (sccb & ~0x7ffffff8UL) != 0) { 317 return -PGM_SPECIFICATION; 318 } 319 320 /* the header contains the actual length of the sccb */ 321 cpu_physical_memory_read(sccb, &header, sizeof(SCCBHeader)); 322 323 /* Valid sccb sizes */ 324 if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) { 325 return -PGM_SPECIFICATION; 326 } 327 328 /* 329 * we want to work on a private copy of the sccb, to prevent guests 330 * from playing dirty tricks by modifying the memory content after 331 * the host has checked the values 332 */ 333 work_sccb = g_malloc0(be16_to_cpu(header.length)); 334 cpu_physical_memory_read(sccb, work_sccb, be16_to_cpu(header.length)); 335 336 if (!sclp_command_code_valid(code)) { 337 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 338 goto out_write; 339 } 340 341 if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) { 342 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); 343 goto out_write; 344 } 345 346 sclp_c->execute(sclp, work_sccb, code); 347 out_write: 348 cpu_physical_memory_write(sccb, work_sccb, 349 be16_to_cpu(work_sccb->h.length)); 350 351 sclp_c->service_interrupt(sclp, sccb); 352 353 return 0; 354 } 355 356 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb) 357 { 358 SCLPEventFacility *ef = sclp->event_facility; 359 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 360 361 uint32_t param = sccb & ~3; 362 363 /* Indicate whether an event is still pending */ 364 param |= efc->event_pending(ef) ? 1 : 0; 365 366 if (!param) { 367 /* No need to send an interrupt, there's nothing to be notified about */ 368 return; 369 } 370 s390_sclp_extint(param); 371 } 372 373 void sclp_service_interrupt(uint32_t sccb) 374 { 375 SCLPDevice *sclp = get_sclp_device(); 376 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 377 378 sclp_c->service_interrupt(sclp, sccb); 379 } 380 381 /* qemu object creation and initialization functions */ 382 static void sclp_realize(DeviceState *dev, Error **errp) 383 { 384 MachineState *machine = MACHINE(qdev_get_machine()); 385 SCLPDevice *sclp = SCLP(dev); 386 uint64_t hw_limit; 387 int ret; 388 389 /* 390 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long 391 * as we can't find a fitting bus via the qom tree, we have to add the 392 * event facility to the sysbus, so e.g. a sclp console can be created. 393 */ 394 if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) { 395 return; 396 } 397 398 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit); 399 if (ret == -E2BIG) { 400 error_setg(errp, "host supports a maximum of %" PRIu64 " GB", 401 hw_limit / GiB); 402 } else if (ret) { 403 error_setg(errp, "setting the guest size failed"); 404 } 405 } 406 407 static void sclp_memory_init(SCLPDevice *sclp) 408 { 409 MachineState *machine = MACHINE(qdev_get_machine()); 410 MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine()); 411 ram_addr_t initial_mem = machine->ram_size; 412 int increment_size = 20; 413 414 /* The storage increment size is a multiple of 1M and is a power of 2. 415 * For some machine types, the number of storage increments must be 416 * MAX_STORAGE_INCREMENTS or fewer. 417 * The variable 'increment_size' is an exponent of 2 that can be 418 * used to calculate the size (in bytes) of an increment. */ 419 while (machine_class->fixup_ram_size != NULL && 420 (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) { 421 increment_size++; 422 } 423 sclp->increment_size = increment_size; 424 } 425 426 static void sclp_init(Object *obj) 427 { 428 SCLPDevice *sclp = SCLP(obj); 429 Object *new; 430 431 new = object_new(TYPE_SCLP_EVENT_FACILITY); 432 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new); 433 object_unref(new); 434 sclp->event_facility = EVENT_FACILITY(new); 435 436 sclp_memory_init(sclp); 437 } 438 439 static void sclp_class_init(ObjectClass *oc, void *data) 440 { 441 SCLPDeviceClass *sc = SCLP_CLASS(oc); 442 DeviceClass *dc = DEVICE_CLASS(oc); 443 444 dc->desc = "SCLP (Service-Call Logical Processor)"; 445 dc->realize = sclp_realize; 446 dc->hotpluggable = false; 447 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 448 /* 449 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init 450 * which is a non-pluggable sysbus device 451 */ 452 dc->user_creatable = false; 453 454 sc->read_SCP_info = read_SCP_info; 455 sc->read_cpu_info = sclp_read_cpu_info; 456 sc->execute = sclp_execute; 457 sc->service_interrupt = service_interrupt; 458 } 459 460 static const TypeInfo sclp_info = { 461 .name = TYPE_SCLP, 462 .parent = TYPE_DEVICE, 463 .instance_init = sclp_init, 464 .instance_size = sizeof(SCLPDevice), 465 .class_init = sclp_class_init, 466 .class_size = sizeof(SCLPDeviceClass), 467 }; 468 469 static void register_types(void) 470 { 471 type_register_static(&sclp_info); 472 } 473 type_init(register_types); 474