s390: guest support for diagnose 0x318
[qemu.git] / hw / s390x / sclp.c
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 "cpu.h"
19 #include "sysemu/sysemu.h"
20 #include "hw/boards.h"
21 #include "hw/s390x/sclp.h"
22 #include "hw/s390x/event-facility.h"
23 #include "hw/s390x/s390-pci-bus.h"
24 #include "hw/s390x/ipl.h"
25
26 static inline SCLPDevice *get_sclp_device(void)
27 {
28 static SCLPDevice *sclp;
29
30 if (!sclp) {
31 sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
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 & PAGE_MASK) + 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 /* CPU information */
129 prepare_cpu_entries(machine, entries_start, &cpu_count);
130 read_info->entries_cpu = cpu_to_be16(cpu_count);
131 read_info->offset_cpu = cpu_to_be16(offset_cpu);
132 read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
133
134 read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
135
136 /* Configuration Characteristic (Extension) */
137 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
138 read_info->conf_char);
139 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
140 read_info->conf_char_ext);
141
142 if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
143 s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134,
144 &read_info->fac134);
145 }
146
147 read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
148 SCLP_HAS_IOA_RECONFIG);
149
150 read_info->mha_pow = s390_get_mha_pow();
151 read_info->hmfai = cpu_to_be32(s390_get_hmfai());
152
153 rnsize = 1 << (sclp->increment_size - 20);
154 if (rnsize <= 128) {
155 read_info->rnsize = rnsize;
156 } else {
157 read_info->rnsize = 0;
158 read_info->rnsize2 = cpu_to_be32(rnsize);
159 }
160
161 /* we don't support standby memory, maxram_size is never exposed */
162 rnmax = machine->ram_size >> sclp->increment_size;
163 if (rnmax < 0x10000) {
164 read_info->rnmax = cpu_to_be16(rnmax);
165 } else {
166 read_info->rnmax = cpu_to_be16(0);
167 read_info->rnmax2 = cpu_to_be64(rnmax);
168 }
169
170 if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
171 memcpy(&read_info->loadparm, &ipib->loadparm,
172 sizeof(read_info->loadparm));
173 } else {
174 s390_ipl_set_loadparm(read_info->loadparm);
175 }
176
177 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
178 }
179
180 /* Provide information about the CPU */
181 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
182 {
183 MachineState *machine = MACHINE(qdev_get_machine());
184 ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
185 int cpu_count;
186 int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len);
187
188 if (be16_to_cpu(sccb->h.length) < required_len) {
189 if (ext_len_sccb_supported(sccb->h)) {
190 sccb->h.length = cpu_to_be16(required_len);
191 }
192 sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
193 return;
194 }
195
196 prepare_cpu_entries(machine, cpu_info->entries, &cpu_count);
197 cpu_info->nr_configured = cpu_to_be16(cpu_count);
198 cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
199 cpu_info->nr_standby = cpu_to_be16(0);
200
201 /* The standby offset is 16-byte for each CPU */
202 cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
203 + cpu_info->nr_configured*sizeof(CPUEntry));
204
205
206 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
207 }
208
209 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
210 bool configure)
211 {
212 int rc;
213
214 if (be16_to_cpu(sccb->h.length) < 16) {
215 rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
216 goto out_err;
217 }
218
219 switch (((IoaCfgSccb *)sccb)->atype) {
220 case SCLP_RECONFIG_PCI_ATYPE:
221 if (s390_has_feat(S390_FEAT_ZPCI)) {
222 if (configure) {
223 s390_pci_sclp_configure(sccb);
224 } else {
225 s390_pci_sclp_deconfigure(sccb);
226 }
227 return;
228 }
229 /* fallthrough */
230 default:
231 rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
232 }
233
234 out_err:
235 sccb->h.response_code = cpu_to_be16(rc);
236 }
237
238 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
239 {
240 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
241 SCLPEventFacility *ef = sclp->event_facility;
242 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
243
244 switch (code & SCLP_CMD_CODE_MASK) {
245 case SCLP_CMDW_READ_SCP_INFO:
246 case SCLP_CMDW_READ_SCP_INFO_FORCED:
247 sclp_c->read_SCP_info(sclp, sccb);
248 break;
249 case SCLP_CMDW_READ_CPU_INFO:
250 sclp_c->read_cpu_info(sclp, sccb);
251 break;
252 case SCLP_CMDW_CONFIGURE_IOA:
253 sclp_configure_io_adapter(sclp, sccb, true);
254 break;
255 case SCLP_CMDW_DECONFIGURE_IOA:
256 sclp_configure_io_adapter(sclp, sccb, false);
257 break;
258 default:
259 efc->command_handler(ef, sccb, code);
260 break;
261 }
262 }
263
264 /*
265 * We only need the address to have something valid for the
266 * service_interrupt call.
267 */
268 #define SCLP_PV_DUMMY_ADDR 0x4000
269 int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
270 uint32_t code)
271 {
272 SCLPDevice *sclp = get_sclp_device();
273 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
274 SCCBHeader header;
275 g_autofree SCCB *work_sccb = NULL;
276
277 s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader));
278
279 work_sccb = g_malloc0(be16_to_cpu(header.length));
280 s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb,
281 be16_to_cpu(header.length));
282
283 if (!sclp_command_code_valid(code)) {
284 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
285 goto out_write;
286 }
287
288 if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) {
289 work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
290 goto out_write;
291 }
292
293 sclp_c->execute(sclp, work_sccb, code);
294 out_write:
295 s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb,
296 be16_to_cpu(work_sccb->h.length));
297 sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
298 return 0;
299 }
300
301 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
302 {
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
383 void s390_sclp_init(void)
384 {
385 Object *new = object_new(TYPE_SCLP);
386
387 object_property_add_child(qdev_get_machine(), TYPE_SCLP, new);
388 object_unref(new);
389 qdev_realize(DEVICE(new), NULL, &error_fatal);
390 }
391
392 static void sclp_realize(DeviceState *dev, Error **errp)
393 {
394 MachineState *machine = MACHINE(qdev_get_machine());
395 SCLPDevice *sclp = SCLP(dev);
396 uint64_t hw_limit;
397 int ret;
398
399 /*
400 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
401 * as we can't find a fitting bus via the qom tree, we have to add the
402 * event facility to the sysbus, so e.g. a sclp console can be created.
403 */
404 if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) {
405 return;
406 }
407
408 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
409 if (ret == -E2BIG) {
410 error_setg(errp, "host supports a maximum of %" PRIu64 " GB",
411 hw_limit / GiB);
412 } else if (ret) {
413 error_setg(errp, "setting the guest size failed");
414 }
415 }
416
417 static void sclp_memory_init(SCLPDevice *sclp)
418 {
419 MachineState *machine = MACHINE(qdev_get_machine());
420 MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine());
421 ram_addr_t initial_mem = machine->ram_size;
422 int increment_size = 20;
423
424 /* The storage increment size is a multiple of 1M and is a power of 2.
425 * For some machine types, the number of storage increments must be
426 * MAX_STORAGE_INCREMENTS or fewer.
427 * The variable 'increment_size' is an exponent of 2 that can be
428 * used to calculate the size (in bytes) of an increment. */
429 while (machine_class->fixup_ram_size != NULL &&
430 (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
431 increment_size++;
432 }
433 sclp->increment_size = increment_size;
434 }
435
436 static void sclp_init(Object *obj)
437 {
438 SCLPDevice *sclp = SCLP(obj);
439 Object *new;
440
441 new = object_new(TYPE_SCLP_EVENT_FACILITY);
442 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new);
443 object_unref(new);
444 sclp->event_facility = EVENT_FACILITY(new);
445
446 sclp_memory_init(sclp);
447 }
448
449 static void sclp_class_init(ObjectClass *oc, void *data)
450 {
451 SCLPDeviceClass *sc = SCLP_CLASS(oc);
452 DeviceClass *dc = DEVICE_CLASS(oc);
453
454 dc->desc = "SCLP (Service-Call Logical Processor)";
455 dc->realize = sclp_realize;
456 dc->hotpluggable = false;
457 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
458 /*
459 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
460 * which is a non-pluggable sysbus device
461 */
462 dc->user_creatable = false;
463
464 sc->read_SCP_info = read_SCP_info;
465 sc->read_cpu_info = sclp_read_cpu_info;
466 sc->execute = sclp_execute;
467 sc->service_interrupt = service_interrupt;
468 }
469
470 static TypeInfo sclp_info = {
471 .name = TYPE_SCLP,
472 .parent = TYPE_DEVICE,
473 .instance_init = sclp_init,
474 .instance_size = sizeof(SCLPDevice),
475 .class_init = sclp_class_init,
476 .class_size = sizeof(SCLPDeviceClass),
477 };
478
479 static void register_types(void)
480 {
481 type_register_static(&sclp_info);
482 }
483 type_init(register_types);