hw/intc/apic_common.c

   1 /*
   2  *  APIC support - common bits of emulated and KVM kernel model
   3  *
   4  *  Copyright (c) 2004-2005 Fabrice Bellard
   5  *  Copyright (c) 2011      Jan Kiszka, Siemens AG
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  19  */
  20 #include "qemu/osdep.h"
  21 #include "qemu/error-report.h"
  22 #include "qapi/error.h"
  23 #include "qemu-common.h"
  24 #include "cpu.h"
  25 #include "qapi/visitor.h"
  26 #include "hw/i386/apic.h"
  27 #include "hw/i386/apic_internal.h"
  28 #include "trace.h"
  29 #include "sysemu/hax.h"
  30 #include "sysemu/kvm.h"
  31 #include "hw/qdev.h"
  32 #include "hw/sysbus.h"
  33
  34 static int apic_irq_delivered;
  35 bool apic_report_tpr_access;
  36
  37 void cpu_set_apic_base(DeviceState *dev, uint64_t val)
  38 {
  39     trace_cpu_set_apic_base(val);
  40
  41     if (dev) {
  42         APICCommonState *s = APIC_COMMON(dev);
  43         APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  44         /* switching to x2APIC, reset possibly modified xAPIC ID */
  45         if (!(s->apicbase & MSR_IA32_APICBASE_EXTD) &&
  46             (val & MSR_IA32_APICBASE_EXTD)) {
  47             s->id = s->initial_apic_id;
  48         }
  49         info->set_base(s, val);
  50     }
  51 }
  52
  53 uint64_t cpu_get_apic_base(DeviceState *dev)
  54 {
  55     if (dev) {
  56         APICCommonState *s = APIC_COMMON(dev);
  57         trace_cpu_get_apic_base((uint64_t)s->apicbase);
  58         return s->apicbase;
  59     } else {
  60         trace_cpu_get_apic_base(MSR_IA32_APICBASE_BSP);
  61         return MSR_IA32_APICBASE_BSP;
  62     }
  63 }
  64
  65 void cpu_set_apic_tpr(DeviceState *dev, uint8_t val)
  66 {
  67     APICCommonState *s;
  68     APICCommonClass *info;
  69
  70     if (!dev) {
  71         return;
  72     }
  73
  74     s = APIC_COMMON(dev);
  75     info = APIC_COMMON_GET_CLASS(s);
  76
  77     info->set_tpr(s, val);
  78 }
  79
  80 uint8_t cpu_get_apic_tpr(DeviceState *dev)
  81 {
  82     APICCommonState *s;
  83     APICCommonClass *info;
  84
  85     if (!dev) {
  86         return 0;
  87     }
  88
  89     s = APIC_COMMON(dev);
  90     info = APIC_COMMON_GET_CLASS(s);
  91
  92     return info->get_tpr(s);
  93 }
  94
  95 void apic_enable_tpr_access_reporting(DeviceState *dev, bool enable)
  96 {
  97     APICCommonState *s = APIC_COMMON(dev);
  98     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  99
 100     apic_report_tpr_access = enable;
 101     if (info->enable_tpr_reporting) {
 102         info->enable_tpr_reporting(s, enable);
 103     }
 104 }
 105
 106 void apic_enable_vapic(DeviceState *dev, hwaddr paddr)
 107 {
 108     APICCommonState *s = APIC_COMMON(dev);
 109     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 110
 111     s->vapic_paddr = paddr;
 112     info->vapic_base_update(s);
 113 }
 114
 115 void apic_handle_tpr_access_report(DeviceState *dev, target_ulong ip,
 116                                    TPRAccess access)
 117 {
 118     APICCommonState *s = APIC_COMMON(dev);
 119
 120     vapic_report_tpr_access(s->vapic, CPU(s->cpu), ip, access);
 121 }
 122
 123 void apic_report_irq_delivered(int delivered)
 124 {
 125     apic_irq_delivered += delivered;
 126
 127     trace_apic_report_irq_delivered(apic_irq_delivered);
 128 }
 129
 130 void apic_reset_irq_delivered(void)
 131 {
 132     /* Copy this into a local variable to encourage gcc to emit a plain
 133      * register for a sys/sdt.h marker.  For details on this workaround, see:
 134      * https://sourceware.org/bugzilla/show_bug.cgi?id=13296
 135      */
 136     volatile int a_i_d = apic_irq_delivered;
 137     trace_apic_reset_irq_delivered(a_i_d);
 138
 139     apic_irq_delivered = 0;
 140 }
 141
 142 int apic_get_irq_delivered(void)
 143 {
 144     trace_apic_get_irq_delivered(apic_irq_delivered);
 145
 146     return apic_irq_delivered;
 147 }
 148
 149 void apic_deliver_nmi(DeviceState *dev)
 150 {
 151     APICCommonState *s = APIC_COMMON(dev);
 152     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 153
 154     info->external_nmi(s);
 155 }
 156
 157 bool apic_next_timer(APICCommonState *s, int64_t current_time)
 158 {
 159     int64_t d;
 160
 161     /* We need to store the timer state separately to support APIC
 162      * implementations that maintain a non-QEMU timer, e.g. inside the
 163      * host kernel. This open-coded state allows us to migrate between
 164      * both models. */
 165     s->timer_expiry = -1;
 166
 167     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED) {
 168         return false;
 169     }
 170
 171     d = (current_time - s->initial_count_load_time) >> s->count_shift;
 172
 173     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
 174         if (!s->initial_count) {
 175             return false;
 176         }
 177         d = ((d / ((uint64_t)s->initial_count + 1)) + 1) *
 178             ((uint64_t)s->initial_count + 1);
 179     } else {
 180         if (d >= s->initial_count) {
 181             return false;
 182         }
 183         d = (uint64_t)s->initial_count + 1;
 184     }
 185     s->next_time = s->initial_count_load_time + (d << s->count_shift);
 186     s->timer_expiry = s->next_time;
 187     return true;
 188 }
 189
 190 void apic_init_reset(DeviceState *dev)
 191 {
 192     APICCommonState *s;
 193     APICCommonClass *info;
 194     int i;
 195
 196     if (!dev) {
 197         return;
 198     }
 199     s = APIC_COMMON(dev);
 200     s->tpr = 0;
 201     s->spurious_vec = 0xff;
 202     s->log_dest = 0;
 203     s->dest_mode = 0xf;
 204     memset(s->isr, 0, sizeof(s->isr));
 205     memset(s->tmr, 0, sizeof(s->tmr));
 206     memset(s->irr, 0, sizeof(s->irr));
 207     for (i = 0; i < APIC_LVT_NB; i++) {
 208         s->lvt[i] = APIC_LVT_MASKED;
 209     }
 210     s->esr = 0;
 211     memset(s->icr, 0, sizeof(s->icr));
 212     s->divide_conf = 0;
 213     s->count_shift = 0;
 214     s->initial_count = 0;
 215     s->initial_count_load_time = 0;
 216     s->next_time = 0;
 217     s->wait_for_sipi = !cpu_is_bsp(s->cpu);
 218
 219     if (s->timer) {
 220         timer_del(s->timer);
 221     }
 222     s->timer_expiry = -1;
 223
 224     info = APIC_COMMON_GET_CLASS(s);
 225     if (info->reset) {
 226         info->reset(s);
 227     }
 228 }
 229
 230 void apic_designate_bsp(DeviceState *dev, bool bsp)
 231 {
 232     if (dev == NULL) {
 233         return;
 234     }
 235
 236     APICCommonState *s = APIC_COMMON(dev);
 237     if (bsp) {
 238         s->apicbase |= MSR_IA32_APICBASE_BSP;
 239     } else {
 240         s->apicbase &= ~MSR_IA32_APICBASE_BSP;
 241     }
 242 }
 243
 244 static void apic_reset_common(DeviceState *dev)
 245 {
 246     APICCommonState *s = APIC_COMMON(dev);
 247     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 248     uint32_t bsp;
 249
 250     bsp = s->apicbase & MSR_IA32_APICBASE_BSP;
 251     s->apicbase = APIC_DEFAULT_ADDRESS | bsp | MSR_IA32_APICBASE_ENABLE;
 252     s->id = s->initial_apic_id;
 253
 254     apic_reset_irq_delivered();
 255
 256     s->vapic_paddr = 0;
 257     info->vapic_base_update(s);
 258
 259     apic_init_reset(dev);
 260 }
 261
 262 /* This function is only used for old state version 1 and 2 */
 263 static int apic_load_old(QEMUFile *f, void *opaque, int version_id)
 264 {
 265     APICCommonState *s = opaque;
 266     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 267     int i;
 268
 269     if (version_id > 2) {
 270         return -EINVAL;
 271     }
 272
 273     /* XXX: what if the base changes? (registered memory regions) */
 274     qemu_get_be32s(f, &s->apicbase);
 275     qemu_get_8s(f, &s->id);
 276     qemu_get_8s(f, &s->arb_id);
 277     qemu_get_8s(f, &s->tpr);
 278     qemu_get_be32s(f, &s->spurious_vec);
 279     qemu_get_8s(f, &s->log_dest);
 280     qemu_get_8s(f, &s->dest_mode);
 281     for (i = 0; i < 8; i++) {
 282         qemu_get_be32s(f, &s->isr[i]);
 283         qemu_get_be32s(f, &s->tmr[i]);
 284         qemu_get_be32s(f, &s->irr[i]);
 285     }
 286     for (i = 0; i < APIC_LVT_NB; i++) {
 287         qemu_get_be32s(f, &s->lvt[i]);
 288     }
 289     qemu_get_be32s(f, &s->esr);
 290     qemu_get_be32s(f, &s->icr[0]);
 291     qemu_get_be32s(f, &s->icr[1]);
 292     qemu_get_be32s(f, &s->divide_conf);
 293     s->count_shift = qemu_get_be32(f);
 294     qemu_get_be32s(f, &s->initial_count);
 295     s->initial_count_load_time = qemu_get_be64(f);
 296     s->next_time = qemu_get_be64(f);
 297
 298     if (version_id >= 2) {
 299         s->timer_expiry = qemu_get_be64(f);
 300     }
 301
 302     if (info->post_load) {
 303         info->post_load(s);
 304     }
 305     return 0;
 306 }
 307
 308 static const VMStateDescription vmstate_apic_common;
 309
 310 static void apic_common_realize(DeviceState *dev, Error **errp)
 311 {
 312     APICCommonState *s = APIC_COMMON(dev);
 313     APICCommonClass *info;
 314     static DeviceState *vapic;
 315     int instance_id = s->id;
 316
 317     info = APIC_COMMON_GET_CLASS(s);
 318     info->realize(dev, errp);
 319
 320     /* Note: We need at least 1M to map the VAPIC option ROM */
 321     if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK &&
 322         !hax_enabled() && ram_size >= 1024 * 1024) {
 323         vapic = sysbus_create_simple("kvmvapic", -1, NULL);
 324     }
 325     s->vapic = vapic;
 326     if (apic_report_tpr_access && info->enable_tpr_reporting) {
 327         info->enable_tpr_reporting(s, true);
 328     }
 329
 330     if (s->legacy_instance_id) {
 331         instance_id = -1;
 332     }
 333     vmstate_register_with_alias_id(NULL, instance_id, &vmstate_apic_common,
 334                                    s, -1, 0, NULL);
 335 }
 336
 337 static void apic_common_unrealize(DeviceState *dev, Error **errp)
 338 {
 339     APICCommonState *s = APIC_COMMON(dev);
 340     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 341
 342     vmstate_unregister(NULL, &vmstate_apic_common, s);
 343     info->unrealize(dev, errp);
 344
 345     if (apic_report_tpr_access && info->enable_tpr_reporting) {
 346         info->enable_tpr_reporting(s, false);
 347     }
 348 }
 349
 350 static int apic_pre_load(void *opaque)
 351 {
 352     APICCommonState *s = APIC_COMMON(opaque);
 353
 354     /* The default is !cpu_is_bsp(s->cpu), but the common value is 0
 355      * so that's what apic_common_sipi_needed checks for.  Reset to
 356      * the value that is assumed when the apic_sipi subsection is
 357      * absent.
 358      */
 359     s->wait_for_sipi = 0;
 360     return 0;
 361 }
 362
 363 static void apic_dispatch_pre_save(void *opaque)
 364 {
 365     APICCommonState *s = APIC_COMMON(opaque);
 366     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 367
 368     if (info->pre_save) {
 369         info->pre_save(s);
 370     }
 371 }
 372
 373 static int apic_dispatch_post_load(void *opaque, int version_id)
 374 {
 375     APICCommonState *s = APIC_COMMON(opaque);
 376     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 377
 378     if (info->post_load) {
 379         info->post_load(s);
 380     }
 381     return 0;
 382 }
 383
 384 static bool apic_common_sipi_needed(void *opaque)
 385 {
 386     APICCommonState *s = APIC_COMMON(opaque);
 387     return s->wait_for_sipi != 0;
 388 }
 389
 390 static const VMStateDescription vmstate_apic_common_sipi = {
 391     .name = "apic_sipi",
 392     .version_id = 1,
 393     .minimum_version_id = 1,
 394     .needed = apic_common_sipi_needed,
 395     .fields = (VMStateField[]) {
 396         VMSTATE_INT32(sipi_vector, APICCommonState),
 397         VMSTATE_INT32(wait_for_sipi, APICCommonState),
 398         VMSTATE_END_OF_LIST()
 399     }
 400 };
 401
 402 static const VMStateDescription vmstate_apic_common = {
 403     .name = "apic",
 404     .version_id = 3,
 405     .minimum_version_id = 3,
 406     .minimum_version_id_old = 1,
 407     .load_state_old = apic_load_old,
 408     .pre_load = apic_pre_load,
 409     .pre_save = apic_dispatch_pre_save,
 410     .post_load = apic_dispatch_post_load,
 411     .fields = (VMStateField[]) {
 412         VMSTATE_UINT32(apicbase, APICCommonState),
 413         VMSTATE_UINT8(id, APICCommonState),
 414         VMSTATE_UINT8(arb_id, APICCommonState),
 415         VMSTATE_UINT8(tpr, APICCommonState),
 416         VMSTATE_UINT32(spurious_vec, APICCommonState),
 417         VMSTATE_UINT8(log_dest, APICCommonState),
 418         VMSTATE_UINT8(dest_mode, APICCommonState),
 419         VMSTATE_UINT32_ARRAY(isr, APICCommonState, 8),
 420         VMSTATE_UINT32_ARRAY(tmr, APICCommonState, 8),
 421         VMSTATE_UINT32_ARRAY(irr, APICCommonState, 8),
 422         VMSTATE_UINT32_ARRAY(lvt, APICCommonState, APIC_LVT_NB),
 423         VMSTATE_UINT32(esr, APICCommonState),
 424         VMSTATE_UINT32_ARRAY(icr, APICCommonState, 2),
 425         VMSTATE_UINT32(divide_conf, APICCommonState),
 426         VMSTATE_INT32(count_shift, APICCommonState),
 427         VMSTATE_UINT32(initial_count, APICCommonState),
 428         VMSTATE_INT64(initial_count_load_time, APICCommonState),
 429         VMSTATE_INT64(next_time, APICCommonState),
 430         VMSTATE_INT64(timer_expiry,
 431                       APICCommonState), /* open-coded timer state */
 432         VMSTATE_END_OF_LIST()
 433     },
 434     .subsections = (const VMStateDescription*[]) {
 435         &vmstate_apic_common_sipi,
 436         NULL
 437     }
 438 };
 439
 440 static Property apic_properties_common[] = {
 441     DEFINE_PROP_UINT8("version", APICCommonState, version, 0x14),
 442     DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT,
 443                     true),
 444     DEFINE_PROP_BOOL("legacy-instance-id", APICCommonState, legacy_instance_id,
 445                      false),
 446     DEFINE_PROP_END_OF_LIST(),
 447 };
 448
 449 static void apic_common_get_id(Object *obj, Visitor *v, const char *name,
 450                                void *opaque, Error **errp)
 451 {
 452     APICCommonState *s = APIC_COMMON(obj);
 453     int64_t value;
 454
 455     value = s->apicbase & MSR_IA32_APICBASE_EXTD ? s->initial_apic_id : s->id;
 456     visit_type_int(v, name, &value, errp);
 457 }
 458
 459 static void apic_common_set_id(Object *obj, Visitor *v, const char *name,
 460                                void *opaque, Error **errp)
 461 {
 462     APICCommonState *s = APIC_COMMON(obj);
 463     DeviceState *dev = DEVICE(obj);
 464     Error *local_err = NULL;
 465     int64_t value;
 466
 467     if (dev->realized) {
 468         qdev_prop_set_after_realize(dev, name, errp);
 469         return;
 470     }
 471
 472     visit_type_int(v, name, &value, &local_err);
 473     if (local_err) {
 474         error_propagate(errp, local_err);
 475         return;
 476     }
 477
 478     s->initial_apic_id = value;
 479     s->id = (uint8_t)value;
 480 }
 481
 482 static void apic_common_initfn(Object *obj)
 483 {
 484     APICCommonState *s = APIC_COMMON(obj);
 485
 486     s->id = s->initial_apic_id = -1;
 487     object_property_add(obj, "id", "int",
 488                         apic_common_get_id,
 489                         apic_common_set_id, NULL, NULL, NULL);
 490 }
 491
 492 static void apic_common_class_init(ObjectClass *klass, void *data)
 493 {
 494     DeviceClass *dc = DEVICE_CLASS(klass);
 495
 496     dc->reset = apic_reset_common;
 497     dc->props = apic_properties_common;
 498     dc->realize = apic_common_realize;
 499     dc->unrealize = apic_common_unrealize;
 500     /*
 501      * Reason: APIC and CPU need to be wired up by
 502      * x86_cpu_apic_create()
 503      */
 504     dc->cannot_instantiate_with_device_add_yet = true;
 505 }
 506
 507 static const TypeInfo apic_common_type = {
 508     .name = TYPE_APIC_COMMON,
 509     .parent = TYPE_DEVICE,
 510     .instance_size = sizeof(APICCommonState),
 511     .instance_init = apic_common_initfn,
 512     .class_size = sizeof(APICCommonClass),
 513     .class_init = apic_common_class_init,
 514     .abstract = true,
 515 };
 516
 517 static void apic_common_register_types(void)
 518 {
 519     type_register_static(&apic_common_type);
 520 }
 521
 522 type_init(apic_common_register_types)