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 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 s390_ipl_convert_loadparm((char *)S390_CCW_MACHINE(machine)->loadparm, 174 read_info->loadparm); 175 176 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 177 } 178 179 /* Provide information about the CPU */ 180 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb) 181 { 182 MachineState *machine = MACHINE(qdev_get_machine()); 183 ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb; 184 int cpu_count; 185 int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len); 186 187 if (be16_to_cpu(sccb->h.length) < required_len) { 188 if (ext_len_sccb_supported(sccb->h)) { 189 sccb->h.length = cpu_to_be16(required_len); 190 } 191 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); 192 return; 193 } 194 195 prepare_cpu_entries(machine, cpu_info->entries, &cpu_count); 196 cpu_info->nr_configured = cpu_to_be16(cpu_count); 197 cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries)); 198 cpu_info->nr_standby = cpu_to_be16(0); 199 200 /* The standby offset is 16-byte for each CPU */ 201 cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured 202 + cpu_info->nr_configured*sizeof(CPUEntry)); 203 204 205 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); 206 } 207 208 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb, 209 bool configure) 210 { 211 int rc; 212 213 if (be16_to_cpu(sccb->h.length) < 16) { 214 rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH; 215 goto out_err; 216 } 217 218 switch (((IoaCfgSccb *)sccb)->atype) { 219 case SCLP_RECONFIG_PCI_ATYPE: 220 if (s390_has_feat(S390_FEAT_ZPCI)) { 221 if (configure) { 222 s390_pci_sclp_configure(sccb); 223 } else { 224 s390_pci_sclp_deconfigure(sccb); 225 } 226 return; 227 } 228 /* fallthrough */ 229 default: 230 rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED; 231 } 232 233 out_err: 234 sccb->h.response_code = cpu_to_be16(rc); 235 } 236 237 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code) 238 { 239 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 240 SCLPEventFacility *ef = sclp->event_facility; 241 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 242 243 switch (code & SCLP_CMD_CODE_MASK) { 244 case SCLP_CMDW_READ_SCP_INFO: 245 case SCLP_CMDW_READ_SCP_INFO_FORCED: 246 sclp_c->read_SCP_info(sclp, sccb); 247 break; 248 case SCLP_CMDW_READ_CPU_INFO: 249 sclp_c->read_cpu_info(sclp, sccb); 250 break; 251 case SCLP_CMDW_CONFIGURE_IOA: 252 sclp_configure_io_adapter(sclp, sccb, true); 253 break; 254 case SCLP_CMDW_DECONFIGURE_IOA: 255 sclp_configure_io_adapter(sclp, sccb, false); 256 break; 257 default: 258 efc->command_handler(ef, sccb, code); 259 break; 260 } 261 } 262 263 /* 264 * We only need the address to have something valid for the 265 * service_interrupt call. 266 */ 267 #define SCLP_PV_DUMMY_ADDR 0x4000 268 int sclp_service_call_protected(S390CPU *cpu, uint64_t sccb, uint32_t code) 269 { 270 CPUS390XState *env = &cpu->env; 271 SCLPDevice *sclp = get_sclp_device(); 272 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 273 SCCBHeader header; 274 g_autofree SCCB *work_sccb = NULL; 275 276 s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader)); 277 278 work_sccb = g_malloc0(be16_to_cpu(header.length)); 279 s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb, 280 be16_to_cpu(header.length)); 281 282 if (!sclp_command_code_valid(code)) { 283 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 284 goto out_write; 285 } 286 287 sclp_c->execute(sclp, work_sccb, code); 288 out_write: 289 s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb, 290 be16_to_cpu(work_sccb->h.length)); 291 sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR); 292 return 0; 293 } 294 295 int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code) 296 { 297 CPUS390XState *env = &cpu->env; 298 SCLPDevice *sclp = get_sclp_device(); 299 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 300 SCCBHeader header; 301 g_autofree SCCB *work_sccb = NULL; 302 303 /* first some basic checks on program checks */ 304 if (env->psw.mask & PSW_MASK_PSTATE) { 305 return -PGM_PRIVILEGED; 306 } 307 if (cpu_physical_memory_is_io(sccb)) { 308 return -PGM_ADDRESSING; 309 } 310 if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa 311 || (sccb & ~0x7ffffff8UL) != 0) { 312 return -PGM_SPECIFICATION; 313 } 314 315 /* the header contains the actual length of the sccb */ 316 cpu_physical_memory_read(sccb, &header, sizeof(SCCBHeader)); 317 318 /* Valid sccb sizes */ 319 if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) { 320 return -PGM_SPECIFICATION; 321 } 322 323 /* 324 * we want to work on a private copy of the sccb, to prevent guests 325 * from playing dirty tricks by modifying the memory content after 326 * the host has checked the values 327 */ 328 work_sccb = g_malloc0(be16_to_cpu(header.length)); 329 cpu_physical_memory_read(sccb, work_sccb, be16_to_cpu(header.length)); 330 331 if (!sclp_command_code_valid(code)) { 332 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 333 goto out_write; 334 } 335 336 if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) { 337 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); 338 goto out_write; 339 } 340 341 sclp_c->execute(sclp, work_sccb, code); 342 out_write: 343 cpu_physical_memory_write(sccb, work_sccb, 344 be16_to_cpu(work_sccb->h.length)); 345 346 sclp_c->service_interrupt(sclp, sccb); 347 348 return 0; 349 } 350 351 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb) 352 { 353 SCLPEventFacility *ef = sclp->event_facility; 354 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 355 356 uint32_t param = sccb & ~3; 357 358 /* Indicate whether an event is still pending */ 359 param |= efc->event_pending(ef) ? 1 : 0; 360 361 if (!param) { 362 /* No need to send an interrupt, there's nothing to be notified about */ 363 return; 364 } 365 s390_sclp_extint(param); 366 } 367 368 void sclp_service_interrupt(uint32_t sccb) 369 { 370 SCLPDevice *sclp = get_sclp_device(); 371 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 372 373 sclp_c->service_interrupt(sclp, sccb); 374 } 375 376 /* qemu object creation and initialization functions */ 377 static void sclp_realize(DeviceState *dev, Error **errp) 378 { 379 MachineState *machine = MACHINE(qdev_get_machine()); 380 SCLPDevice *sclp = SCLP(dev); 381 uint64_t hw_limit; 382 int ret; 383 384 /* 385 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long 386 * as we can't find a fitting bus via the qom tree, we have to add the 387 * event facility to the sysbus, so e.g. a sclp console can be created. 388 */ 389 if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) { 390 return; 391 } 392 393 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit); 394 if (ret == -E2BIG) { 395 error_setg(errp, "host supports a maximum of %" PRIu64 " GB", 396 hw_limit / GiB); 397 } else if (ret) { 398 error_setg(errp, "setting the guest size failed"); 399 } 400 } 401 402 static void sclp_memory_init(SCLPDevice *sclp) 403 { 404 MachineState *machine = MACHINE(qdev_get_machine()); 405 MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine()); 406 ram_addr_t initial_mem = machine->ram_size; 407 int increment_size = 20; 408 409 /* The storage increment size is a multiple of 1M and is a power of 2. 410 * For some machine types, the number of storage increments must be 411 * MAX_STORAGE_INCREMENTS or fewer. 412 * The variable 'increment_size' is an exponent of 2 that can be 413 * used to calculate the size (in bytes) of an increment. */ 414 while (machine_class->fixup_ram_size != NULL && 415 (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) { 416 increment_size++; 417 } 418 sclp->increment_size = increment_size; 419 } 420 421 static void sclp_init(Object *obj) 422 { 423 SCLPDevice *sclp = SCLP(obj); 424 Object *new; 425 426 new = object_new(TYPE_SCLP_EVENT_FACILITY); 427 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new); 428 object_unref(new); 429 sclp->event_facility = EVENT_FACILITY(new); 430 431 sclp_memory_init(sclp); 432 } 433 434 static void sclp_class_init(ObjectClass *oc, void *data) 435 { 436 SCLPDeviceClass *sc = SCLP_CLASS(oc); 437 DeviceClass *dc = DEVICE_CLASS(oc); 438 439 dc->desc = "SCLP (Service-Call Logical Processor)"; 440 dc->realize = sclp_realize; 441 dc->hotpluggable = false; 442 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 443 /* 444 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init 445 * which is a non-pluggable sysbus device 446 */ 447 dc->user_creatable = false; 448 449 sc->read_SCP_info = read_SCP_info; 450 sc->read_cpu_info = sclp_read_cpu_info; 451 sc->execute = sclp_execute; 452 sc->service_interrupt = service_interrupt; 453 } 454 455 static const TypeInfo sclp_info = { 456 .name = TYPE_SCLP, 457 .parent = TYPE_DEVICE, 458 .instance_init = sclp_init, 459 .instance_size = sizeof(SCLPDevice), 460 .class_init = sclp_class_init, 461 .class_size = sizeof(SCLPDeviceClass), 462 }; 463 464 static void register_types(void) 465 { 466 type_register_static(&sclp_info); 467 } 468 type_init(register_types); 469