hw/pci-host/q35.c

   1 /*
   2  * QEMU MCH/ICH9 PCI Bridge Emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  * Copyright (c) 2009, 2010, 2011
   6  *               Isaku Yamahata <yamahata at valinux co jp>
   7  *               VA Linux Systems Japan K.K.
   8  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
   9  *
  10  * This is based on piix.c, but heavily modified.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30 #include "hw/hw.h"
  31 #include "hw/pci-host/q35.h"
  32 #include "qapi/visitor.h"
  33
  34 /****************************************************************************
  35  * Q35 host
  36  */
  37
  38 static void q35_host_realize(DeviceState *dev, Error **errp)
  39 {
  40     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  41     Q35PCIHost *s = Q35_HOST_DEVICE(dev);
  42     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  43
  44     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
  45     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
  46
  47     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
  48     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
  49
  50     pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
  51                            s->mch.pci_address_space, s->mch.address_space_io,
  52                            0, TYPE_PCIE_BUS);
  53     qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
  54     qdev_init_nofail(DEVICE(&s->mch));
  55 }
  56
  57 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
  58                                           PCIBus *rootbus)
  59 {
  60     Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
  61
  62      /* For backwards compat with old device paths */
  63     if (s->mch.short_root_bus) {
  64         return "0000";
  65     }
  66     return "0000:00";
  67 }
  68
  69 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
  70                                         void *opaque, const char *name,
  71                                         Error **errp)
  72 {
  73     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  74     uint32_t value = s->mch.pci_info.w32.begin;
  75
  76     visit_type_uint32(v, &value, name, errp);
  77 }
  78
  79 static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
  80                                       void *opaque, const char *name,
  81                                       Error **errp)
  82 {
  83     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  84     uint32_t value = s->mch.pci_info.w32.end;
  85
  86     visit_type_uint32(v, &value, name, errp);
  87 }
  88
  89 static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
  90                                           void *opaque, const char *name,
  91                                           Error **errp)
  92 {
  93     PCIHostState *h = PCI_HOST_BRIDGE(obj);
  94     Range w64;
  95
  96     pci_bus_get_w64_range(h->bus, &w64);
  97
  98     visit_type_uint64(v, &w64.begin, name, errp);
  99 }
 100
 101 static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
 102                                         void *opaque, const char *name,
 103                                         Error **errp)
 104 {
 105     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 106     Range w64;
 107
 108     pci_bus_get_w64_range(h->bus, &w64);
 109
 110     visit_type_uint64(v, &w64.end, name, errp);
 111 }
 112
 113 static void q35_host_get_mmcfg_size(Object *obj, Visitor *v,
 114                                     void *opaque, const char *name,
 115                                     Error **errp)
 116 {
 117     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
 118     uint32_t value = e->size;
 119
 120     visit_type_uint32(v, &value, name, errp);
 121 }
 122
 123 static Property mch_props[] = {
 124     DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
 125                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
 126     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
 127                      mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
 128     DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
 129     DEFINE_PROP_END_OF_LIST(),
 130 };
 131
 132 static void q35_host_class_init(ObjectClass *klass, void *data)
 133 {
 134     DeviceClass *dc = DEVICE_CLASS(klass);
 135     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 136
 137     hc->root_bus_path = q35_host_root_bus_path;
 138     dc->realize = q35_host_realize;
 139     dc->props = mch_props;
 140     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 141     dc->fw_name = "pci";
 142 }
 143
 144 static void q35_host_initfn(Object *obj)
 145 {
 146     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 147     PCIHostState *phb = PCI_HOST_BRIDGE(obj);
 148
 149     memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
 150                           "pci-conf-idx", 4);
 151     memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
 152                           "pci-conf-data", 4);
 153
 154     object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
 155     object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
 156     qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
 157     qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
 158
 159     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
 160                         q35_host_get_pci_hole_start,
 161                         NULL, NULL, NULL, NULL);
 162
 163     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
 164                         q35_host_get_pci_hole_end,
 165                         NULL, NULL, NULL, NULL);
 166
 167     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
 168                         q35_host_get_pci_hole64_start,
 169                         NULL, NULL, NULL, NULL);
 170
 171     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
 172                         q35_host_get_pci_hole64_end,
 173                         NULL, NULL, NULL, NULL);
 174
 175     object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
 176                         q35_host_get_mmcfg_size,
 177                         NULL, NULL, NULL, NULL);
 178
 179     /* Leave enough space for the biggest MCFG BAR */
 180     /* TODO: this matches current bios behaviour, but
 181      * it's not a power of two, which means an MTRR
 182      * can't cover it exactly.
 183      */
 184     s->mch.pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT +
 185         MCH_HOST_BRIDGE_PCIEXBAR_MAX;
 186     s->mch.pci_info.w32.end = IO_APIC_DEFAULT_ADDRESS;
 187 }
 188
 189 static const TypeInfo q35_host_info = {
 190     .name       = TYPE_Q35_HOST_DEVICE,
 191     .parent     = TYPE_PCIE_HOST_BRIDGE,
 192     .instance_size = sizeof(Q35PCIHost),
 193     .instance_init = q35_host_initfn,
 194     .class_init = q35_host_class_init,
 195 };
 196
 197 /****************************************************************************
 198  * MCH D0:F0
 199  */
 200
 201 static uint64_t tseg_blackhole_read(void *ptr, hwaddr reg, unsigned size)
 202 {
 203     return 0xffffffff;
 204 }
 205
 206 static void tseg_blackhole_write(void *opaque, hwaddr addr, uint64_t val,
 207                                  unsigned width)
 208 {
 209     /* nothing */
 210 }
 211
 212 static const MemoryRegionOps tseg_blackhole_ops = {
 213     .read = tseg_blackhole_read,
 214     .write = tseg_blackhole_write,
 215     .endianness = DEVICE_NATIVE_ENDIAN,
 216     .valid.min_access_size = 1,
 217     .valid.max_access_size = 4,
 218     .impl.min_access_size = 4,
 219     .impl.max_access_size = 4,
 220     .endianness = DEVICE_LITTLE_ENDIAN,
 221 };
 222
 223 /* PCIe MMCFG */
 224 static void mch_update_pciexbar(MCHPCIState *mch)
 225 {
 226     PCIDevice *pci_dev = PCI_DEVICE(mch);
 227     BusState *bus = qdev_get_parent_bus(DEVICE(mch));
 228     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
 229
 230     uint64_t pciexbar;
 231     int enable;
 232     uint64_t addr;
 233     uint64_t addr_mask;
 234     uint32_t length;
 235
 236     pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
 237     enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
 238     addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
 239     switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
 240     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
 241         length = 256 * 1024 * 1024;
 242         break;
 243     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
 244         length = 128 * 1024 * 1024;
 245         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
 246             MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 247         break;
 248     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
 249         length = 64 * 1024 * 1024;
 250         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 251         break;
 252     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
 253     default:
 254         enable = 0;
 255         length = 0;
 256         abort();
 257         break;
 258     }
 259     addr = pciexbar & addr_mask;
 260     pcie_host_mmcfg_update(pehb, enable, addr, length);
 261     /* Leave enough space for the MCFG BAR */
 262     /*
 263      * TODO: this matches current bios behaviour, but it's not a power of two,
 264      * which means an MTRR can't cover it exactly.
 265      */
 266     if (enable) {
 267         mch->pci_info.w32.begin = addr + length;
 268     } else {
 269         mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 270     }
 271 }
 272
 273 /* PAM */
 274 static void mch_update_pam(MCHPCIState *mch)
 275 {
 276     PCIDevice *pd = PCI_DEVICE(mch);
 277     int i;
 278
 279     memory_region_transaction_begin();
 280     for (i = 0; i < 13; i++) {
 281         pam_update(&mch->pam_regions[i], i,
 282                    pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
 283     }
 284     memory_region_transaction_commit();
 285 }
 286
 287 /* SMRAM */
 288 static void mch_update_smram(MCHPCIState *mch)
 289 {
 290     PCIDevice *pd = PCI_DEVICE(mch);
 291     bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
 292     uint32_t tseg_size;
 293
 294     /* implement SMRAM.D_LCK */
 295     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
 296         pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
 297         pd->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK_LCK;
 298         pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK_LCK;
 299     }
 300
 301     memory_region_transaction_begin();
 302
 303     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
 304         /* Hide (!) low SMRAM if H_SMRAME = 1 */
 305         memory_region_set_enabled(&mch->smram_region, h_smrame);
 306         /* Show high SMRAM if H_SMRAME = 1 */
 307         memory_region_set_enabled(&mch->open_high_smram, h_smrame);
 308     } else {
 309         /* Hide high SMRAM and low SMRAM */
 310         memory_region_set_enabled(&mch->smram_region, true);
 311         memory_region_set_enabled(&mch->open_high_smram, false);
 312     }
 313
 314     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME) {
 315         memory_region_set_enabled(&mch->low_smram, !h_smrame);
 316         memory_region_set_enabled(&mch->high_smram, h_smrame);
 317     } else {
 318         memory_region_set_enabled(&mch->low_smram, false);
 319         memory_region_set_enabled(&mch->high_smram, false);
 320     }
 321
 322     if (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) {
 323         switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
 324                 MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
 325         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB:
 326             tseg_size = 1024 * 1024;
 327             break;
 328         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB:
 329             tseg_size = 1024 * 1024 * 2;
 330             break;
 331         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB:
 332             tseg_size = 1024 * 1024 * 8;
 333             break;
 334         default:
 335             tseg_size = 0;
 336             break;
 337         }
 338     } else {
 339         tseg_size = 0;
 340     }
 341     memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
 342     memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
 343     memory_region_set_size(&mch->tseg_blackhole, tseg_size);
 344     memory_region_add_subregion_overlap(mch->system_memory,
 345                                         mch->below_4g_mem_size - tseg_size,
 346                                         &mch->tseg_blackhole, 1);
 347
 348     memory_region_set_enabled(&mch->tseg_window, tseg_size);
 349     memory_region_set_size(&mch->tseg_window, tseg_size);
 350     memory_region_set_address(&mch->tseg_window,
 351                               mch->below_4g_mem_size - tseg_size);
 352     memory_region_set_alias_offset(&mch->tseg_window,
 353                                    mch->below_4g_mem_size - tseg_size);
 354
 355     memory_region_transaction_commit();
 356 }
 357
 358 static void mch_write_config(PCIDevice *d,
 359                               uint32_t address, uint32_t val, int len)
 360 {
 361     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 362
 363     pci_default_write_config(d, address, val, len);
 364
 365     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
 366                        MCH_HOST_BRIDGE_PAM_SIZE)) {
 367         mch_update_pam(mch);
 368     }
 369
 370     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
 371                        MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
 372         mch_update_pciexbar(mch);
 373     }
 374
 375     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
 376                        MCH_HOST_BRIDGE_SMRAM_SIZE)) {
 377         mch_update_smram(mch);
 378     }
 379 }
 380
 381 static void mch_update(MCHPCIState *mch)
 382 {
 383     mch_update_pciexbar(mch);
 384     mch_update_pam(mch);
 385     mch_update_smram(mch);
 386 }
 387
 388 static int mch_post_load(void *opaque, int version_id)
 389 {
 390     MCHPCIState *mch = opaque;
 391     mch_update(mch);
 392     return 0;
 393 }
 394
 395 static const VMStateDescription vmstate_mch = {
 396     .name = "mch",
 397     .version_id = 1,
 398     .minimum_version_id = 1,
 399     .post_load = mch_post_load,
 400     .fields = (VMStateField[]) {
 401         VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
 402         /* Used to be smm_enabled, which was basically always zero because
 403          * SeaBIOS hardly uses SMM.  SMRAM is now handled by CPU code.
 404          */
 405         VMSTATE_UNUSED(1),
 406         VMSTATE_END_OF_LIST()
 407     }
 408 };
 409
 410 static void mch_reset(DeviceState *qdev)
 411 {
 412     PCIDevice *d = PCI_DEVICE(qdev);
 413     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 414
 415     pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
 416                  MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
 417
 418     d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
 419     d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
 420     d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
 421     d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
 422
 423     mch_update(mch);
 424 }
 425
 426 static AddressSpace *q35_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 427 {
 428     IntelIOMMUState *s = opaque;
 429     VTDAddressSpace *vtd_as;
 430
 431     assert(0 <= devfn && devfn <= VTD_PCI_DEVFN_MAX);
 432
 433     vtd_as = vtd_find_add_as(s, bus, devfn);
 434     return &vtd_as->as;
 435 }
 436
 437 static void mch_init_dmar(MCHPCIState *mch)
 438 {
 439     PCIBus *pci_bus = PCI_BUS(qdev_get_parent_bus(DEVICE(mch)));
 440
 441     mch->iommu = INTEL_IOMMU_DEVICE(qdev_create(NULL, TYPE_INTEL_IOMMU_DEVICE));
 442     object_property_add_child(OBJECT(mch), "intel-iommu",
 443                               OBJECT(mch->iommu), NULL);
 444     qdev_init_nofail(DEVICE(mch->iommu));
 445     sysbus_mmio_map(SYS_BUS_DEVICE(mch->iommu), 0, Q35_HOST_BRIDGE_IOMMU_ADDR);
 446
 447     pci_setup_iommu(pci_bus, q35_host_dma_iommu, mch->iommu);
 448 }
 449
 450 static void mch_realize(PCIDevice *d, Error **errp)
 451 {
 452     int i;
 453     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 454
 455     /* setup pci memory mapping */
 456     pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
 457                            mch->pci_address_space);
 458
 459     /* if *disabled* show SMRAM to all CPUs */
 460     memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
 461                              mch->pci_address_space, 0xa0000, 0x20000);
 462     memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
 463                                         &mch->smram_region, 1);
 464     memory_region_set_enabled(&mch->smram_region, true);
 465
 466     memory_region_init_alias(&mch->open_high_smram, OBJECT(mch), "smram-open-high",
 467                              mch->ram_memory, 0xa0000, 0x20000);
 468     memory_region_add_subregion_overlap(mch->system_memory, 0xfeda0000,
 469                                         &mch->open_high_smram, 1);
 470     memory_region_set_enabled(&mch->open_high_smram, false);
 471
 472     /* smram, as seen by SMM CPUs */
 473     memory_region_init(&mch->smram, OBJECT(mch), "smram", 1ull << 32);
 474     memory_region_set_enabled(&mch->smram, true);
 475     memory_region_init_alias(&mch->low_smram, OBJECT(mch), "smram-low",
 476                              mch->ram_memory, 0xa0000, 0x20000);
 477     memory_region_set_enabled(&mch->low_smram, true);
 478     memory_region_add_subregion(&mch->smram, 0xa0000, &mch->low_smram);
 479     memory_region_init_alias(&mch->high_smram, OBJECT(mch), "smram-high",
 480                              mch->ram_memory, 0xa0000, 0x20000);
 481     memory_region_set_enabled(&mch->high_smram, true);
 482     memory_region_add_subregion(&mch->smram, 0xfeda0000, &mch->high_smram);
 483
 484     memory_region_init_io(&mch->tseg_blackhole, OBJECT(mch),
 485                           &tseg_blackhole_ops, NULL,
 486                           "tseg-blackhole", 0);
 487     memory_region_set_enabled(&mch->tseg_blackhole, false);
 488     memory_region_add_subregion_overlap(mch->system_memory,
 489                                         mch->below_4g_mem_size,
 490                                         &mch->tseg_blackhole, 1);
 491
 492     memory_region_init_alias(&mch->tseg_window, OBJECT(mch), "tseg-window",
 493                              mch->ram_memory, mch->below_4g_mem_size, 0);
 494     memory_region_set_enabled(&mch->tseg_window, false);
 495     memory_region_add_subregion(&mch->smram, mch->below_4g_mem_size,
 496                                 &mch->tseg_window);
 497     object_property_add_const_link(qdev_get_machine(), "smram",
 498                                    OBJECT(&mch->smram), &error_abort);
 499
 500     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 501              mch->pci_address_space, &mch->pam_regions[0],
 502              PAM_BIOS_BASE, PAM_BIOS_SIZE);
 503     for (i = 0; i < 12; ++i) {
 504         init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 505                  mch->pci_address_space, &mch->pam_regions[i+1],
 506                  PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
 507     }
 508     /* Intel IOMMU (VT-d) */
 509     if (machine_iommu(current_machine)) {
 510         mch_init_dmar(mch);
 511     }
 512 }
 513
 514 uint64_t mch_mcfg_base(void)
 515 {
 516     bool ambiguous;
 517     Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
 518     if (!o) {
 519         return 0;
 520     }
 521     return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 522 }
 523
 524 static void mch_class_init(ObjectClass *klass, void *data)
 525 {
 526     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 527     DeviceClass *dc = DEVICE_CLASS(klass);
 528
 529     k->realize = mch_realize;
 530     k->config_write = mch_write_config;
 531     dc->reset = mch_reset;
 532     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 533     dc->desc = "Host bridge";
 534     dc->vmsd = &vmstate_mch;
 535     k->vendor_id = PCI_VENDOR_ID_INTEL;
 536     k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
 537     k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
 538     k->class_id = PCI_CLASS_BRIDGE_HOST;
 539     /*
 540      * PCI-facing part of the host bridge, not usable without the
 541      * host-facing part, which can't be device_add'ed, yet.
 542      */
 543     dc->cannot_instantiate_with_device_add_yet = true;
 544 }
 545
 546 static const TypeInfo mch_info = {
 547     .name = TYPE_MCH_PCI_DEVICE,
 548     .parent = TYPE_PCI_DEVICE,
 549     .instance_size = sizeof(MCHPCIState),
 550     .class_init = mch_class_init,
 551 };
 552
 553 static void q35_register(void)
 554 {
 555     type_register_static(&mch_info);
 556     type_register_static(&q35_host_info);
 557 }
 558
 559 type_init(q35_register);