hw/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 "apic.h"
  21 #include "apic_internal.h"
  22 #include "trace.h"
  23 #include "kvm.h"
  24
  25 static int apic_irq_delivered;
  26 bool apic_report_tpr_access;
  27
  28 void cpu_set_apic_base(DeviceState *d, uint64_t val)
  29 {
  30     trace_cpu_set_apic_base(val);
  31
  32     if (d) {
  33         APICCommonState *s = APIC_COMMON(d);
  34         APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  35         info->set_base(s, val);
  36     }
  37 }
  38
  39 uint64_t cpu_get_apic_base(DeviceState *d)
  40 {
  41     if (d) {
  42         APICCommonState *s = APIC_COMMON(d);
  43         trace_cpu_get_apic_base((uint64_t)s->apicbase);
  44         return s->apicbase;
  45     } else {
  46         trace_cpu_get_apic_base(0);
  47         return 0;
  48     }
  49 }
  50
  51 void cpu_set_apic_tpr(DeviceState *d, uint8_t val)
  52 {
  53     APICCommonState *s;
  54     APICCommonClass *info;
  55
  56     if (!d) {
  57         return;
  58     }
  59
  60     s = APIC_COMMON(d);
  61     info = APIC_COMMON_GET_CLASS(s);
  62
  63     info->set_tpr(s, val);
  64 }
  65
  66 uint8_t cpu_get_apic_tpr(DeviceState *d)
  67 {
  68     APICCommonState *s;
  69     APICCommonClass *info;
  70
  71     if (!d) {
  72         return 0;
  73     }
  74
  75     s = APIC_COMMON(d);
  76     info = APIC_COMMON_GET_CLASS(s);
  77
  78     return info->get_tpr(s);
  79 }
  80
  81 void apic_enable_tpr_access_reporting(DeviceState *d, bool enable)
  82 {
  83     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
  84     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  85
  86     apic_report_tpr_access = enable;
  87     if (info->enable_tpr_reporting) {
  88         info->enable_tpr_reporting(s, enable);
  89     }
  90 }
  91
  92 void apic_enable_vapic(DeviceState *d, target_phys_addr_t paddr)
  93 {
  94     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
  95     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  96
  97     s->vapic_paddr = paddr;
  98     info->vapic_base_update(s);
  99 }
 100
 101 void apic_handle_tpr_access_report(DeviceState *d, target_ulong ip,
 102                                    TPRAccess access)
 103 {
 104     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 105
 106     vapic_report_tpr_access(s->vapic, s->cpu_env, ip, access);
 107 }
 108
 109 void apic_report_irq_delivered(int delivered)
 110 {
 111     apic_irq_delivered += delivered;
 112
 113     trace_apic_report_irq_delivered(apic_irq_delivered);
 114 }
 115
 116 void apic_reset_irq_delivered(void)
 117 {
 118     trace_apic_reset_irq_delivered(apic_irq_delivered);
 119
 120     apic_irq_delivered = 0;
 121 }
 122
 123 int apic_get_irq_delivered(void)
 124 {
 125     trace_apic_get_irq_delivered(apic_irq_delivered);
 126
 127     return apic_irq_delivered;
 128 }
 129
 130 void apic_deliver_nmi(DeviceState *d)
 131 {
 132     APICCommonState *s = APIC_COMMON(d);
 133     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 134
 135     info->external_nmi(s);
 136 }
 137
 138 bool apic_next_timer(APICCommonState *s, int64_t current_time)
 139 {
 140     int64_t d;
 141
 142     /* We need to store the timer state separately to support APIC
 143      * implementations that maintain a non-QEMU timer, e.g. inside the
 144      * host kernel. This open-coded state allows us to migrate between
 145      * both models. */
 146     s->timer_expiry = -1;
 147
 148     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED) {
 149         return false;
 150     }
 151
 152     d = (current_time - s->initial_count_load_time) >> s->count_shift;
 153
 154     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
 155         if (!s->initial_count) {
 156             return false;
 157         }
 158         d = ((d / ((uint64_t)s->initial_count + 1)) + 1) *
 159             ((uint64_t)s->initial_count + 1);
 160     } else {
 161         if (d >= s->initial_count) {
 162             return false;
 163         }
 164         d = (uint64_t)s->initial_count + 1;
 165     }
 166     s->next_time = s->initial_count_load_time + (d << s->count_shift);
 167     s->timer_expiry = s->next_time;
 168     return true;
 169 }
 170
 171 void apic_init_reset(DeviceState *d)
 172 {
 173     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 174     int i;
 175
 176     if (!s) {
 177         return;
 178     }
 179     s->tpr = 0;
 180     s->spurious_vec = 0xff;
 181     s->log_dest = 0;
 182     s->dest_mode = 0xf;
 183     memset(s->isr, 0, sizeof(s->isr));
 184     memset(s->tmr, 0, sizeof(s->tmr));
 185     memset(s->irr, 0, sizeof(s->irr));
 186     for (i = 0; i < APIC_LVT_NB; i++) {
 187         s->lvt[i] = APIC_LVT_MASKED;
 188     }
 189     s->esr = 0;
 190     memset(s->icr, 0, sizeof(s->icr));
 191     s->divide_conf = 0;
 192     s->count_shift = 0;
 193     s->initial_count = 0;
 194     s->initial_count_load_time = 0;
 195     s->next_time = 0;
 196     s->wait_for_sipi = 1;
 197
 198     if (s->timer) {
 199         qemu_del_timer(s->timer);
 200     }
 201     s->timer_expiry = -1;
 202 }
 203
 204 static void apic_reset_common(DeviceState *d)
 205 {
 206     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 207     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 208     bool bsp;
 209
 210     bsp = cpu_is_bsp(s->cpu_env);
 211     s->apicbase = 0xfee00000 |
 212         (bsp ? MSR_IA32_APICBASE_BSP : 0) | MSR_IA32_APICBASE_ENABLE;
 213
 214     s->vapic_paddr = 0;
 215     info->vapic_base_update(s);
 216
 217     apic_init_reset(d);
 218
 219     if (bsp) {
 220         /*
 221          * LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
 222          * time typically by BIOS, so PIC interrupt can be delivered to the
 223          * processor when local APIC is enabled.
 224          */
 225         s->lvt[APIC_LVT_LINT0] = 0x700;
 226     }
 227 }
 228
 229 /* This function is only used for old state version 1 and 2 */
 230 static int apic_load_old(QEMUFile *f, void *opaque, int version_id)
 231 {
 232     APICCommonState *s = opaque;
 233     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 234     int i;
 235
 236     if (version_id > 2) {
 237         return -EINVAL;
 238     }
 239
 240     /* XXX: what if the base changes? (registered memory regions) */
 241     qemu_get_be32s(f, &s->apicbase);
 242     qemu_get_8s(f, &s->id);
 243     qemu_get_8s(f, &s->arb_id);
 244     qemu_get_8s(f, &s->tpr);
 245     qemu_get_be32s(f, &s->spurious_vec);
 246     qemu_get_8s(f, &s->log_dest);
 247     qemu_get_8s(f, &s->dest_mode);
 248     for (i = 0; i < 8; i++) {
 249         qemu_get_be32s(f, &s->isr[i]);
 250         qemu_get_be32s(f, &s->tmr[i]);
 251         qemu_get_be32s(f, &s->irr[i]);
 252     }
 253     for (i = 0; i < APIC_LVT_NB; i++) {
 254         qemu_get_be32s(f, &s->lvt[i]);
 255     }
 256     qemu_get_be32s(f, &s->esr);
 257     qemu_get_be32s(f, &s->icr[0]);
 258     qemu_get_be32s(f, &s->icr[1]);
 259     qemu_get_be32s(f, &s->divide_conf);
 260     s->count_shift = qemu_get_be32(f);
 261     qemu_get_be32s(f, &s->initial_count);
 262     s->initial_count_load_time = qemu_get_be64(f);
 263     s->next_time = qemu_get_be64(f);
 264
 265     if (version_id >= 2) {
 266         s->timer_expiry = qemu_get_be64(f);
 267     }
 268
 269     if (info->post_load) {
 270         info->post_load(s);
 271     }
 272     return 0;
 273 }
 274
 275 static int apic_init_common(SysBusDevice *dev)
 276 {
 277     APICCommonState *s = APIC_COMMON(dev);
 278     APICCommonClass *info;
 279     static DeviceState *vapic;
 280     static int apic_no;
 281
 282     if (apic_no >= MAX_APICS) {
 283         return -1;
 284     }
 285     s->idx = apic_no++;
 286
 287     info = APIC_COMMON_GET_CLASS(s);
 288     info->init(s);
 289
 290     sysbus_init_mmio(dev, &s->io_memory);
 291
 292     if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK) {
 293         vapic = sysbus_create_simple("kvmvapic", -1, NULL);
 294     }
 295     s->vapic = vapic;
 296     if (apic_report_tpr_access && info->enable_tpr_reporting) {
 297         info->enable_tpr_reporting(s, true);
 298     }
 299
 300     return 0;
 301 }
 302
 303 static void apic_dispatch_pre_save(void *opaque)
 304 {
 305     APICCommonState *s = APIC_COMMON(opaque);
 306     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 307
 308     if (info->pre_save) {
 309         info->pre_save(s);
 310     }
 311 }
 312
 313 static int apic_dispatch_post_load(void *opaque, int version_id)
 314 {
 315     APICCommonState *s = APIC_COMMON(opaque);
 316     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 317
 318     if (info->post_load) {
 319         info->post_load(s);
 320     }
 321     return 0;
 322 }
 323
 324 static const VMStateDescription vmstate_apic_common = {
 325     .name = "apic",
 326     .version_id = 3,
 327     .minimum_version_id = 3,
 328     .minimum_version_id_old = 1,
 329     .load_state_old = apic_load_old,
 330     .pre_save = apic_dispatch_pre_save,
 331     .post_load = apic_dispatch_post_load,
 332     .fields = (VMStateField[]) {
 333         VMSTATE_UINT32(apicbase, APICCommonState),
 334         VMSTATE_UINT8(id, APICCommonState),
 335         VMSTATE_UINT8(arb_id, APICCommonState),
 336         VMSTATE_UINT8(tpr, APICCommonState),
 337         VMSTATE_UINT32(spurious_vec, APICCommonState),
 338         VMSTATE_UINT8(log_dest, APICCommonState),
 339         VMSTATE_UINT8(dest_mode, APICCommonState),
 340         VMSTATE_UINT32_ARRAY(isr, APICCommonState, 8),
 341         VMSTATE_UINT32_ARRAY(tmr, APICCommonState, 8),
 342         VMSTATE_UINT32_ARRAY(irr, APICCommonState, 8),
 343         VMSTATE_UINT32_ARRAY(lvt, APICCommonState, APIC_LVT_NB),
 344         VMSTATE_UINT32(esr, APICCommonState),
 345         VMSTATE_UINT32_ARRAY(icr, APICCommonState, 2),
 346         VMSTATE_UINT32(divide_conf, APICCommonState),
 347         VMSTATE_INT32(count_shift, APICCommonState),
 348         VMSTATE_UINT32(initial_count, APICCommonState),
 349         VMSTATE_INT64(initial_count_load_time, APICCommonState),
 350         VMSTATE_INT64(next_time, APICCommonState),
 351         VMSTATE_INT64(timer_expiry,
 352                       APICCommonState), /* open-coded timer state */
 353         VMSTATE_END_OF_LIST()
 354     }
 355 };
 356
 357 static Property apic_properties_common[] = {
 358     DEFINE_PROP_UINT8("id", APICCommonState, id, -1),
 359     DEFINE_PROP_PTR("cpu_env", APICCommonState, cpu_env),
 360     DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT,
 361                     true),
 362     DEFINE_PROP_END_OF_LIST(),
 363 };
 364
 365 static void apic_common_class_init(ObjectClass *klass, void *data)
 366 {
 367     SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
 368     DeviceClass *dc = DEVICE_CLASS(klass);
 369
 370     dc->vmsd = &vmstate_apic_common;
 371     dc->reset = apic_reset_common;
 372     dc->no_user = 1;
 373     dc->props = apic_properties_common;
 374     sc->init = apic_init_common;
 375 }
 376
 377 static TypeInfo apic_common_type = {
 378     .name = TYPE_APIC_COMMON,
 379     .parent = TYPE_SYS_BUS_DEVICE,
 380     .instance_size = sizeof(APICCommonState),
 381     .class_size = sizeof(APICCommonClass),
 382     .class_init = apic_common_class_init,
 383     .abstract = true,
 384 };
 385
 386 static void register_types(void)
 387 {
 388     type_register_static(&apic_common_type);
 389 }
 390
 391 type_init(register_types)