hw/xen_pt.c

   1 /*
   2  * Copyright (c) 2007, Neocleus Corporation.
   3  * Copyright (c) 2007, Intel Corporation.
   4  *
   5  * This work is licensed under the terms of the GNU GPL, version 2.  See
   6  * the COPYING file in the top-level directory.
   7  *
   8  * Alex Novik <alex@neocleus.com>
   9  * Allen Kay <allen.m.kay@intel.com>
  10  * Guy Zana <guy@neocleus.com>
  11  *
  12  * This file implements direct PCI assignment to a HVM guest
  13  */
  14
  15 /*
  16  * Interrupt Disable policy:
  17  *
  18  * INTx interrupt:
  19  *   Initialize(register_real_device)
  20  *     Map INTx(xc_physdev_map_pirq):
  21  *       <fail>
  22  *         - Set real Interrupt Disable bit to '1'.
  23  *         - Set machine_irq and assigned_device->machine_irq to '0'.
  24  *         * Don't bind INTx.
  25  *
  26  *     Bind INTx(xc_domain_bind_pt_pci_irq):
  27  *       <fail>
  28  *         - Set real Interrupt Disable bit to '1'.
  29  *         - Unmap INTx.
  30  *         - Decrement xen_pt_mapped_machine_irq[machine_irq]
  31  *         - Set assigned_device->machine_irq to '0'.
  32  *
  33  *   Write to Interrupt Disable bit by guest software(xen_pt_cmd_reg_write)
  34  *     Write '0'
  35  *       - Set real bit to '0' if assigned_device->machine_irq isn't '0'.
  36  *
  37  *     Write '1'
  38  *       - Set real bit to '1'.
  39  *
  40  * MSI interrupt:
  41  *   Initialize MSI register(xen_pt_msi_setup, xen_pt_msi_update)
  42  *     Bind MSI(xc_domain_update_msi_irq)
  43  *       <fail>
  44  *         - Unmap MSI.
  45  *         - Set dev->msi->pirq to '-1'.
  46  *
  47  * MSI-X interrupt:
  48  *   Initialize MSI-X register(xen_pt_msix_update_one)
  49  *     Bind MSI-X(xc_domain_update_msi_irq)
  50  *       <fail>
  51  *         - Unmap MSI-X.
  52  *         - Set entry->pirq to '-1'.
  53  */
  54
  55 #include <sys/ioctl.h>
  56
  57 #include "pci.h"
  58 #include "xen.h"
  59 #include "xen_backend.h"
  60 #include "xen_pt.h"
  61 #include "range.h"
  62
  63 #define XEN_PT_NR_IRQS (256)
  64 static uint8_t xen_pt_mapped_machine_irq[XEN_PT_NR_IRQS] = {0};
  65
  66 void xen_pt_log(const PCIDevice *d, const char *f, ...)
  67 {
  68     va_list ap;
  69
  70     va_start(ap, f);
  71     if (d) {
  72         fprintf(stderr, "[%02x:%02x.%d] ", pci_bus_num(d->bus),
  73                 PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
  74     }
  75     vfprintf(stderr, f, ap);
  76     va_end(ap);
  77 }
  78
  79 /* Config Space */
  80
  81 static int xen_pt_pci_config_access_check(PCIDevice *d, uint32_t addr, int len)
  82 {
  83     /* check offset range */
  84     if (addr >= 0xFF) {
  85         XEN_PT_ERR(d, "Failed to access register with offset exceeding 0xFF. "
  86                    "(addr: 0x%02x, len: %d)\n", addr, len);
  87         return -1;
  88     }
  89
  90     /* check read size */
  91     if ((len != 1) && (len != 2) && (len != 4)) {
  92         XEN_PT_ERR(d, "Failed to access register with invalid access length. "
  93                    "(addr: 0x%02x, len: %d)\n", addr, len);
  94         return -1;
  95     }
  96
  97     /* check offset alignment */
  98     if (addr & (len - 1)) {
  99         XEN_PT_ERR(d, "Failed to access register with invalid access size "
 100                    "alignment. (addr: 0x%02x, len: %d)\n", addr, len);
 101         return -1;
 102     }
 103
 104     return 0;
 105 }
 106
 107 int xen_pt_bar_offset_to_index(uint32_t offset)
 108 {
 109     int index = 0;
 110
 111     /* check Exp ROM BAR */
 112     if (offset == PCI_ROM_ADDRESS) {
 113         return PCI_ROM_SLOT;
 114     }
 115
 116     /* calculate BAR index */
 117     index = (offset - PCI_BASE_ADDRESS_0) >> 2;
 118     if (index >= PCI_NUM_REGIONS) {
 119         return -1;
 120     }
 121
 122     return index;
 123 }
 124
 125 static uint32_t xen_pt_pci_read_config(PCIDevice *d, uint32_t addr, int len)
 126 {
 127     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 128     uint32_t val = 0;
 129     XenPTRegGroup *reg_grp_entry = NULL;
 130     XenPTReg *reg_entry = NULL;
 131     int rc = 0;
 132     int emul_len = 0;
 133     uint32_t find_addr = addr;
 134
 135     if (xen_pt_pci_config_access_check(d, addr, len)) {
 136         goto exit;
 137     }
 138
 139     /* find register group entry */
 140     reg_grp_entry = xen_pt_find_reg_grp(s, addr);
 141     if (reg_grp_entry) {
 142         /* check 0-Hardwired register group */
 143         if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {
 144             /* no need to emulate, just return 0 */
 145             val = 0;
 146             goto exit;
 147         }
 148     }
 149
 150     /* read I/O device register value */
 151     rc = xen_host_pci_get_block(&s->real_device, addr, (uint8_t *)&val, len);
 152     if (rc < 0) {
 153         XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);
 154         memset(&val, 0xff, len);
 155     }
 156
 157     /* just return the I/O device register value for
 158      * passthrough type register group */
 159     if (reg_grp_entry == NULL) {
 160         goto exit;
 161     }
 162
 163     /* adjust the read value to appropriate CFC-CFF window */
 164     val <<= (addr & 3) << 3;
 165     emul_len = len;
 166
 167     /* loop around the guest requested size */
 168     while (emul_len > 0) {
 169         /* find register entry to be emulated */
 170         reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);
 171         if (reg_entry) {
 172             XenPTRegInfo *reg = reg_entry->reg;
 173             uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;
 174             uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);
 175             uint8_t *ptr_val = NULL;
 176
 177             valid_mask <<= (find_addr - real_offset) << 3;
 178             ptr_val = (uint8_t *)&val + (real_offset & 3);
 179
 180             /* do emulation based on register size */
 181             switch (reg->size) {
 182             case 1:
 183                 if (reg->u.b.read) {
 184                     rc = reg->u.b.read(s, reg_entry, ptr_val, valid_mask);
 185                 }
 186                 break;
 187             case 2:
 188                 if (reg->u.w.read) {
 189                     rc = reg->u.w.read(s, reg_entry,
 190                                        (uint16_t *)ptr_val, valid_mask);
 191                 }
 192                 break;
 193             case 4:
 194                 if (reg->u.dw.read) {
 195                     rc = reg->u.dw.read(s, reg_entry,
 196                                         (uint32_t *)ptr_val, valid_mask);
 197                 }
 198                 break;
 199             }
 200
 201             if (rc < 0) {
 202                 xen_shutdown_fatal_error("Internal error: Invalid read "
 203                                          "emulation. (%s, rc: %d)\n",
 204                                          __func__, rc);
 205                 return 0;
 206             }
 207
 208             /* calculate next address to find */
 209             emul_len -= reg->size;
 210             if (emul_len > 0) {
 211                 find_addr = real_offset + reg->size;
 212             }
 213         } else {
 214             /* nothing to do with passthrough type register,
 215              * continue to find next byte */
 216             emul_len--;
 217             find_addr++;
 218         }
 219     }
 220
 221     /* need to shift back before returning them to pci bus emulator */
 222     val >>= ((addr & 3) << 3);
 223
 224 exit:
 225     XEN_PT_LOG_CONFIG(d, addr, val, len);
 226     return val;
 227 }
 228
 229 static void xen_pt_pci_write_config(PCIDevice *d, uint32_t addr,
 230                                     uint32_t val, int len)
 231 {
 232     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 233     int index = 0;
 234     XenPTRegGroup *reg_grp_entry = NULL;
 235     int rc = 0;
 236     uint32_t read_val = 0;
 237     int emul_len = 0;
 238     XenPTReg *reg_entry = NULL;
 239     uint32_t find_addr = addr;
 240     XenPTRegInfo *reg = NULL;
 241
 242     if (xen_pt_pci_config_access_check(d, addr, len)) {
 243         return;
 244     }
 245
 246     XEN_PT_LOG_CONFIG(d, addr, val, len);
 247
 248     /* check unused BAR register */
 249     index = xen_pt_bar_offset_to_index(addr);
 250     if ((index >= 0) && (val > 0 && val < XEN_PT_BAR_ALLF) &&
 251         (s->bases[index].bar_flag == XEN_PT_BAR_FLAG_UNUSED)) {
 252         XEN_PT_WARN(d, "Guest attempt to set address to unused Base Address "
 253                     "Register. (addr: 0x%02x, len: %d)\n", addr, len);
 254     }
 255
 256     /* find register group entry */
 257     reg_grp_entry = xen_pt_find_reg_grp(s, addr);
 258     if (reg_grp_entry) {
 259         /* check 0-Hardwired register group */
 260         if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {
 261             /* ignore silently */
 262             XEN_PT_WARN(d, "Access to 0-Hardwired register. "
 263                         "(addr: 0x%02x, len: %d)\n", addr, len);
 264             return;
 265         }
 266     }
 267
 268     rc = xen_host_pci_get_block(&s->real_device, addr,
 269                                 (uint8_t *)&read_val, len);
 270     if (rc < 0) {
 271         XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);
 272         memset(&read_val, 0xff, len);
 273     }
 274
 275     /* pass directly to the real device for passthrough type register group */
 276     if (reg_grp_entry == NULL) {
 277         goto out;
 278     }
 279
 280     memory_region_transaction_begin();
 281     pci_default_write_config(d, addr, val, len);
 282
 283     /* adjust the read and write value to appropriate CFC-CFF window */
 284     read_val <<= (addr & 3) << 3;
 285     val <<= (addr & 3) << 3;
 286     emul_len = len;
 287
 288     /* loop around the guest requested size */
 289     while (emul_len > 0) {
 290         /* find register entry to be emulated */
 291         reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);
 292         if (reg_entry) {
 293             reg = reg_entry->reg;
 294             uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;
 295             uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);
 296             uint8_t *ptr_val = NULL;
 297
 298             valid_mask <<= (find_addr - real_offset) << 3;
 299             ptr_val = (uint8_t *)&val + (real_offset & 3);
 300
 301             /* do emulation based on register size */
 302             switch (reg->size) {
 303             case 1:
 304                 if (reg->u.b.write) {
 305                     rc = reg->u.b.write(s, reg_entry, ptr_val,
 306                                         read_val >> ((real_offset & 3) << 3),
 307                                         valid_mask);
 308                 }
 309                 break;
 310             case 2:
 311                 if (reg->u.w.write) {
 312                     rc = reg->u.w.write(s, reg_entry, (uint16_t *)ptr_val,
 313                                         (read_val >> ((real_offset & 3) << 3)),
 314                                         valid_mask);
 315                 }
 316                 break;
 317             case 4:
 318                 if (reg->u.dw.write) {
 319                     rc = reg->u.dw.write(s, reg_entry, (uint32_t *)ptr_val,
 320                                          (read_val >> ((real_offset & 3) << 3)),
 321                                          valid_mask);
 322                 }
 323                 break;
 324             }
 325
 326             if (rc < 0) {
 327                 xen_shutdown_fatal_error("Internal error: Invalid write"
 328                                          " emulation. (%s, rc: %d)\n",
 329                                          __func__, rc);
 330                 return;
 331             }
 332
 333             /* calculate next address to find */
 334             emul_len -= reg->size;
 335             if (emul_len > 0) {
 336                 find_addr = real_offset + reg->size;
 337             }
 338         } else {
 339             /* nothing to do with passthrough type register,
 340              * continue to find next byte */
 341             emul_len--;
 342             find_addr++;
 343         }
 344     }
 345
 346     /* need to shift back before passing them to xen_host_pci_device */
 347     val >>= (addr & 3) << 3;
 348
 349     memory_region_transaction_commit();
 350
 351 out:
 352     if (!(reg && reg->no_wb)) {
 353         /* unknown regs are passed through */
 354         rc = xen_host_pci_set_block(&s->real_device, addr,
 355                                     (uint8_t *)&val, len);
 356
 357         if (rc < 0) {
 358             XEN_PT_ERR(d, "pci_write_block failed. return value: %d.\n", rc);
 359         }
 360     }
 361 }
 362
 363 /* register regions */
 364
 365 static uint64_t xen_pt_bar_read(void *o, target_phys_addr_t addr,
 366                                 unsigned size)
 367 {
 368     PCIDevice *d = o;
 369     /* if this function is called, that probably means that there is a
 370      * misconfiguration of the IOMMU. */
 371     XEN_PT_ERR(d, "Should not read BAR through QEMU. @0x"TARGET_FMT_plx"\n",
 372                addr);
 373     return 0;
 374 }
 375 static void xen_pt_bar_write(void *o, target_phys_addr_t addr, uint64_t val,
 376                              unsigned size)
 377 {
 378     PCIDevice *d = o;
 379     /* Same comment as xen_pt_bar_read function */
 380     XEN_PT_ERR(d, "Should not write BAR through QEMU. @0x"TARGET_FMT_plx"\n",
 381                addr);
 382 }
 383
 384 static const MemoryRegionOps ops = {
 385     .endianness = DEVICE_NATIVE_ENDIAN,
 386     .read = xen_pt_bar_read,
 387     .write = xen_pt_bar_write,
 388 };
 389
 390 static int xen_pt_register_regions(XenPCIPassthroughState *s)
 391 {
 392     int i = 0;
 393     XenHostPCIDevice *d = &s->real_device;
 394
 395     /* Register PIO/MMIO BARs */
 396     for (i = 0; i < PCI_ROM_SLOT; i++) {
 397         XenHostPCIIORegion *r = &d->io_regions[i];
 398         uint8_t type;
 399
 400         if (r->base_addr == 0 || r->size == 0) {
 401             continue;
 402         }
 403
 404         s->bases[i].access.u = r->base_addr;
 405
 406         if (r->type & XEN_HOST_PCI_REGION_TYPE_IO) {
 407             type = PCI_BASE_ADDRESS_SPACE_IO;
 408         } else {
 409             type = PCI_BASE_ADDRESS_SPACE_MEMORY;
 410             if (r->type & XEN_HOST_PCI_REGION_TYPE_PREFETCH) {
 411                 type |= PCI_BASE_ADDRESS_MEM_PREFETCH;
 412             }
 413         }
 414
 415         memory_region_init_io(&s->bar[i], &ops, &s->dev,
 416                               "xen-pci-pt-bar", r->size);
 417         pci_register_bar(&s->dev, i, type, &s->bar[i]);
 418
 419         XEN_PT_LOG(&s->dev, "IO region %i registered (size=0x%08"PRIx64
 420                    " base_addr=0x%08"PRIx64" type: %#x)\n",
 421                    i, r->size, r->base_addr, type);
 422     }
 423
 424     /* Register expansion ROM address */
 425     if (d->rom.base_addr && d->rom.size) {
 426         uint32_t bar_data = 0;
 427
 428         /* Re-set BAR reported by OS, otherwise ROM can't be read. */
 429         if (xen_host_pci_get_long(d, PCI_ROM_ADDRESS, &bar_data)) {
 430             return 0;
 431         }
 432         if ((bar_data & PCI_ROM_ADDRESS_MASK) == 0) {
 433             bar_data |= d->rom.base_addr & PCI_ROM_ADDRESS_MASK;
 434             xen_host_pci_set_long(d, PCI_ROM_ADDRESS, bar_data);
 435         }
 436
 437         s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;
 438
 439         memory_region_init_rom_device(&s->rom, NULL, NULL,
 440                                       "xen-pci-pt-rom", d->rom.size);
 441         pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,
 442                          &s->rom);
 443
 444         XEN_PT_LOG(&s->dev, "Expansion ROM registered (size=0x%08"PRIx64
 445                    " base_addr=0x%08"PRIx64")\n",
 446                    d->rom.size, d->rom.base_addr);
 447     }
 448
 449     return 0;
 450 }
 451
 452 static void xen_pt_unregister_regions(XenPCIPassthroughState *s)
 453 {
 454     XenHostPCIDevice *d = &s->real_device;
 455     int i;
 456
 457     for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
 458         XenHostPCIIORegion *r = &d->io_regions[i];
 459
 460         if (r->base_addr == 0 || r->size == 0) {
 461             continue;
 462         }
 463
 464         memory_region_destroy(&s->bar[i]);
 465     }
 466     if (d->rom.base_addr && d->rom.size) {
 467         memory_region_destroy(&s->rom);
 468     }
 469 }
 470
 471 /* region mapping */
 472
 473 static int xen_pt_bar_from_region(XenPCIPassthroughState *s, MemoryRegion *mr)
 474 {
 475     int i = 0;
 476
 477     for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
 478         if (mr == &s->bar[i]) {
 479             return i;
 480         }
 481     }
 482     if (mr == &s->rom) {
 483         return PCI_ROM_SLOT;
 484     }
 485     return -1;
 486 }
 487
 488 /*
 489  * This function checks if an io_region overlaps an io_region from another
 490  * device.  The io_region to check is provided with (addr, size and type)
 491  * A callback can be provided and will be called for every region that is
 492  * overlapped.
 493  * The return value indicates if the region is overlappsed */
 494 struct CheckBarArgs {
 495     XenPCIPassthroughState *s;
 496     pcibus_t addr;
 497     pcibus_t size;
 498     uint8_t type;
 499     bool rc;
 500 };
 501 static void xen_pt_check_bar_overlap(PCIBus *bus, PCIDevice *d, void *opaque)
 502 {
 503     struct CheckBarArgs *arg = opaque;
 504     XenPCIPassthroughState *s = arg->s;
 505     uint8_t type = arg->type;
 506     int i;
 507
 508     if (d->devfn == s->dev.devfn) {
 509         return;
 510     }
 511
 512     /* xxx: This ignores bridges. */
 513     for (i = 0; i < PCI_NUM_REGIONS; i++) {
 514         const PCIIORegion *r = &d->io_regions[i];
 515
 516         if (!r->size) {
 517             continue;
 518         }
 519         if ((type & PCI_BASE_ADDRESS_SPACE_IO)
 520             != (r->type & PCI_BASE_ADDRESS_SPACE_IO)) {
 521             continue;
 522         }
 523
 524         if (ranges_overlap(arg->addr, arg->size, r->addr, r->size)) {
 525             XEN_PT_WARN(&s->dev,
 526                         "Overlapped to device [%02x:%02x.%d] Region: %i"
 527                         " (addr: %#"FMT_PCIBUS", len: %#"FMT_PCIBUS")\n",
 528                         pci_bus_num(bus), PCI_SLOT(d->devfn),
 529                         PCI_FUNC(d->devfn), i, r->addr, r->size);
 530             arg->rc = true;
 531         }
 532     }
 533 }
 534
 535 static void xen_pt_region_update(XenPCIPassthroughState *s,
 536                                  MemoryRegionSection *sec, bool adding)
 537 {
 538     PCIDevice *d = &s->dev;
 539     MemoryRegion *mr = sec->mr;
 540     int bar = -1;
 541     int rc;
 542     int op = adding ? DPCI_ADD_MAPPING : DPCI_REMOVE_MAPPING;
 543     struct CheckBarArgs args = {
 544         .s = s,
 545         .addr = sec->offset_within_address_space,
 546         .size = sec->size,
 547         .rc = false,
 548     };
 549
 550     bar = xen_pt_bar_from_region(s, mr);
 551     if (bar == -1 && (!s->msix || &s->msix->mmio != mr)) {
 552         return;
 553     }
 554
 555     if (s->msix && &s->msix->mmio == mr) {
 556         if (adding) {
 557             s->msix->mmio_base_addr = sec->offset_within_address_space;
 558             rc = xen_pt_msix_update_remap(s, s->msix->bar_index);
 559         }
 560         return;
 561     }
 562
 563     args.type = d->io_regions[bar].type;
 564     pci_for_each_device(d->bus, pci_bus_num(d->bus),
 565                         xen_pt_check_bar_overlap, &args);
 566     if (args.rc) {
 567         XEN_PT_WARN(d, "Region: %d (addr: %#"FMT_PCIBUS
 568                     ", len: %#"FMT_PCIBUS") is overlapped.\n",
 569                     bar, sec->offset_within_address_space, sec->size);
 570     }
 571
 572     if (d->io_regions[bar].type & PCI_BASE_ADDRESS_SPACE_IO) {
 573         uint32_t guest_port = sec->offset_within_address_space;
 574         uint32_t machine_port = s->bases[bar].access.pio_base;
 575         uint32_t size = sec->size;
 576         rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
 577                                       guest_port, machine_port, size,
 578                                       op);
 579         if (rc) {
 580             XEN_PT_ERR(d, "%s ioport mapping failed! (rc: %i)\n",
 581                        adding ? "create new" : "remove old", rc);
 582         }
 583     } else {
 584         pcibus_t guest_addr = sec->offset_within_address_space;
 585         pcibus_t machine_addr = s->bases[bar].access.maddr
 586             + sec->offset_within_region;
 587         pcibus_t size = sec->size;
 588         rc = xc_domain_memory_mapping(xen_xc, xen_domid,
 589                                       XEN_PFN(guest_addr + XC_PAGE_SIZE - 1),
 590                                       XEN_PFN(machine_addr + XC_PAGE_SIZE - 1),
 591                                       XEN_PFN(size + XC_PAGE_SIZE - 1),
 592                                       op);
 593         if (rc) {
 594             XEN_PT_ERR(d, "%s mem mapping failed! (rc: %i)\n",
 595                        adding ? "create new" : "remove old", rc);
 596         }
 597     }
 598 }
 599
 600 static void xen_pt_begin(MemoryListener *l)
 601 {
 602 }
 603
 604 static void xen_pt_commit(MemoryListener *l)
 605 {
 606 }
 607
 608 static void xen_pt_region_add(MemoryListener *l, MemoryRegionSection *sec)
 609 {
 610     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 611                                              memory_listener);
 612
 613     xen_pt_region_update(s, sec, true);
 614 }
 615
 616 static void xen_pt_region_del(MemoryListener *l, MemoryRegionSection *sec)
 617 {
 618     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 619                                              memory_listener);
 620
 621     xen_pt_region_update(s, sec, false);
 622 }
 623
 624 static void xen_pt_region_nop(MemoryListener *l, MemoryRegionSection *s)
 625 {
 626 }
 627
 628 static void xen_pt_log_fns(MemoryListener *l, MemoryRegionSection *s)
 629 {
 630 }
 631
 632 static void xen_pt_log_global_fns(MemoryListener *l)
 633 {
 634 }
 635
 636 static void xen_pt_eventfd_fns(MemoryListener *l, MemoryRegionSection *s,
 637                                bool match_data, uint64_t data, int fd)
 638 {
 639 }
 640
 641 static const MemoryListener xen_pt_memory_listener = {
 642     .begin = xen_pt_begin,
 643     .commit = xen_pt_commit,
 644     .region_add = xen_pt_region_add,
 645     .region_nop = xen_pt_region_nop,
 646     .region_del = xen_pt_region_del,
 647     .log_start = xen_pt_log_fns,
 648     .log_stop = xen_pt_log_fns,
 649     .log_sync = xen_pt_log_fns,
 650     .log_global_start = xen_pt_log_global_fns,
 651     .log_global_stop = xen_pt_log_global_fns,
 652     .eventfd_add = xen_pt_eventfd_fns,
 653     .eventfd_del = xen_pt_eventfd_fns,
 654     .priority = 10,
 655 };
 656
 657 /* init */
 658
 659 static int xen_pt_initfn(PCIDevice *d)
 660 {
 661     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 662     int rc = 0;
 663     uint8_t machine_irq = 0;
 664     int pirq = XEN_PT_UNASSIGNED_PIRQ;
 665
 666     /* register real device */
 667     XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"
 668                " to devfn %#x\n",
 669                s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function,
 670                s->dev.devfn);
 671
 672     rc = xen_host_pci_device_get(&s->real_device,
 673                                  s->hostaddr.domain, s->hostaddr.bus,
 674                                  s->hostaddr.slot, s->hostaddr.function);
 675     if (rc) {
 676         XEN_PT_ERR(d, "Failed to \"open\" the real pci device. rc: %i\n", rc);
 677         return -1;
 678     }
 679
 680     s->is_virtfn = s->real_device.is_virtfn;
 681     if (s->is_virtfn) {
 682         XEN_PT_LOG(d, "%04x:%02x:%02x.%d is a SR-IOV Virtual Function\n",
 683                    s->real_device.domain, bus, slot, func);
 684     }
 685
 686     /* Initialize virtualized PCI configuration (Extended 256 Bytes) */
 687     if (xen_host_pci_get_block(&s->real_device, 0, d->config,
 688                                PCI_CONFIG_SPACE_SIZE) == -1) {
 689         xen_host_pci_device_put(&s->real_device);
 690         return -1;
 691     }
 692
 693     s->memory_listener = xen_pt_memory_listener;
 694
 695     /* Handle real device's MMIO/PIO BARs */
 696     xen_pt_register_regions(s);
 697
 698     /* reinitialize each config register to be emulated */
 699     if (xen_pt_config_init(s)) {
 700         XEN_PT_ERR(d, "PCI Config space initialisation failed.\n");
 701         xen_host_pci_device_put(&s->real_device);
 702         return -1;
 703     }
 704
 705     /* Bind interrupt */
 706     if (!s->dev.config[PCI_INTERRUPT_PIN]) {
 707         XEN_PT_LOG(d, "no pin interrupt\n");
 708         goto out;
 709     }
 710
 711     machine_irq = s->real_device.irq;
 712     rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
 713
 714     if (rc < 0) {
 715         XEN_PT_ERR(d, "Mapping machine irq %u to pirq %i failed, (rc: %d)\n",
 716                    machine_irq, pirq, rc);
 717
 718         /* Disable PCI intx assertion (turn on bit10 of devctl) */
 719         xen_host_pci_set_word(&s->real_device,
 720                               PCI_COMMAND,
 721                               pci_get_word(s->dev.config + PCI_COMMAND)
 722                               | PCI_COMMAND_INTX_DISABLE);
 723         machine_irq = 0;
 724         s->machine_irq = 0;
 725     } else {
 726         machine_irq = pirq;
 727         s->machine_irq = pirq;
 728         xen_pt_mapped_machine_irq[machine_irq]++;
 729     }
 730
 731     /* bind machine_irq to device */
 732     if (machine_irq != 0) {
 733         uint8_t e_intx = xen_pt_pci_intx(s);
 734
 735         rc = xc_domain_bind_pt_pci_irq(xen_xc, xen_domid, machine_irq,
 736                                        pci_bus_num(d->bus),
 737                                        PCI_SLOT(d->devfn),
 738                                        e_intx);
 739         if (rc < 0) {
 740             XEN_PT_ERR(d, "Binding of interrupt %i failed! (rc: %d)\n",
 741                        e_intx, rc);
 742
 743             /* Disable PCI intx assertion (turn on bit10 of devctl) */
 744             xen_host_pci_set_word(&s->real_device, PCI_COMMAND,
 745                                   *(uint16_t *)(&s->dev.config[PCI_COMMAND])
 746                                   | PCI_COMMAND_INTX_DISABLE);
 747             xen_pt_mapped_machine_irq[machine_irq]--;
 748
 749             if (xen_pt_mapped_machine_irq[machine_irq] == 0) {
 750                 if (xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq)) {
 751                     XEN_PT_ERR(d, "Unmapping of machine interrupt %i failed!"
 752                                " (rc: %d)\n", machine_irq, rc);
 753                 }
 754             }
 755             s->machine_irq = 0;
 756         }
 757     }
 758
 759 out:
 760     memory_listener_register(&s->memory_listener, NULL);
 761     XEN_PT_LOG(d, "Real physical device %02x:%02x.%d registered successfuly!\n",
 762                bus, slot, func);
 763
 764     return 0;
 765 }
 766
 767 static int xen_pt_unregister_device(PCIDevice *d)
 768 {
 769     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 770     uint8_t machine_irq = s->machine_irq;
 771     uint8_t intx = xen_pt_pci_intx(s);
 772     int rc;
 773
 774     if (machine_irq) {
 775         rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,
 776                                      PT_IRQ_TYPE_PCI,
 777                                      pci_bus_num(d->bus),
 778                                      PCI_SLOT(s->dev.devfn),
 779                                      intx,
 780                                      0 /* isa_irq */);
 781         if (rc < 0) {
 782             XEN_PT_ERR(d, "unbinding of interrupt INT%c failed."
 783                        " (machine irq: %i, rc: %d)"
 784                        " But bravely continuing on..\n",
 785                        'a' + intx, machine_irq, rc);
 786         }
 787     }
 788
 789     if (s->msi) {
 790         xen_pt_msi_disable(s);
 791     }
 792     if (s->msix) {
 793         xen_pt_msix_disable(s);
 794     }
 795
 796     if (machine_irq) {
 797         xen_pt_mapped_machine_irq[machine_irq]--;
 798
 799         if (xen_pt_mapped_machine_irq[machine_irq] == 0) {
 800             rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq);
 801
 802             if (rc < 0) {
 803                 XEN_PT_ERR(d, "unmapping of interrupt %i failed. (rc: %d)"
 804                            " But bravely continuing on..\n",
 805                            machine_irq, rc);
 806             }
 807         }
 808     }
 809
 810     /* delete all emulated config registers */
 811     xen_pt_config_delete(s);
 812
 813     xen_pt_unregister_regions(s);
 814     memory_listener_unregister(&s->memory_listener);
 815
 816     xen_host_pci_device_put(&s->real_device);
 817
 818     return 0;
 819 }
 820
 821 static Property xen_pci_passthrough_properties[] = {
 822     DEFINE_PROP_PCI_HOST_DEVADDR("hostaddr", XenPCIPassthroughState, hostaddr),
 823     DEFINE_PROP_END_OF_LIST(),
 824 };
 825
 826 static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)
 827 {
 828     DeviceClass *dc = DEVICE_CLASS(klass);
 829     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 830
 831     k->init = xen_pt_initfn;
 832     k->exit = xen_pt_unregister_device;
 833     k->config_read = xen_pt_pci_read_config;
 834     k->config_write = xen_pt_pci_write_config;
 835     dc->desc = "Assign an host PCI device with Xen";
 836     dc->props = xen_pci_passthrough_properties;
 837 };
 838
 839 static TypeInfo xen_pci_passthrough_info = {
 840     .name = "xen-pci-passthrough",
 841     .parent = TYPE_PCI_DEVICE,
 842     .instance_size = sizeof(XenPCIPassthroughState),
 843     .class_init = xen_pci_passthrough_class_init,
 844 };
 845
 846 static void xen_pci_passthrough_register_types(void)
 847 {
 848     type_register_static(&xen_pci_passthrough_info);
 849 }
 850
 851 type_init(xen_pci_passthrough_register_types)