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 #include "exec-memory.h"
  63
  64 #define XEN_PT_NR_IRQS (256)
  65 static uint8_t xen_pt_mapped_machine_irq[XEN_PT_NR_IRQS] = {0};
  66
  67 void xen_pt_log(const PCIDevice *d, const char *f, ...)
  68 {
  69     va_list ap;
  70
  71     va_start(ap, f);
  72     if (d) {
  73         fprintf(stderr, "[%02x:%02x.%d] ", pci_bus_num(d->bus),
  74                 PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
  75     }
  76     vfprintf(stderr, f, ap);
  77     va_end(ap);
  78 }
  79
  80 /* Config Space */
  81
  82 static int xen_pt_pci_config_access_check(PCIDevice *d, uint32_t addr, int len)
  83 {
  84     /* check offset range */
  85     if (addr >= 0xFF) {
  86         XEN_PT_ERR(d, "Failed to access register with offset exceeding 0xFF. "
  87                    "(addr: 0x%02x, len: %d)\n", addr, len);
  88         return -1;
  89     }
  90
  91     /* check read size */
  92     if ((len != 1) && (len != 2) && (len != 4)) {
  93         XEN_PT_ERR(d, "Failed to access register with invalid access length. "
  94                    "(addr: 0x%02x, len: %d)\n", addr, len);
  95         return -1;
  96     }
  97
  98     /* check offset alignment */
  99     if (addr & (len - 1)) {
 100         XEN_PT_ERR(d, "Failed to access register with invalid access size "
 101                    "alignment. (addr: 0x%02x, len: %d)\n", addr, len);
 102         return -1;
 103     }
 104
 105     return 0;
 106 }
 107
 108 int xen_pt_bar_offset_to_index(uint32_t offset)
 109 {
 110     int index = 0;
 111
 112     /* check Exp ROM BAR */
 113     if (offset == PCI_ROM_ADDRESS) {
 114         return PCI_ROM_SLOT;
 115     }
 116
 117     /* calculate BAR index */
 118     index = (offset - PCI_BASE_ADDRESS_0) >> 2;
 119     if (index >= PCI_NUM_REGIONS) {
 120         return -1;
 121     }
 122
 123     return index;
 124 }
 125
 126 static uint32_t xen_pt_pci_read_config(PCIDevice *d, uint32_t addr, int len)
 127 {
 128     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 129     uint32_t val = 0;
 130     XenPTRegGroup *reg_grp_entry = NULL;
 131     XenPTReg *reg_entry = NULL;
 132     int rc = 0;
 133     int emul_len = 0;
 134     uint32_t find_addr = addr;
 135
 136     if (xen_pt_pci_config_access_check(d, addr, len)) {
 137         goto exit;
 138     }
 139
 140     /* find register group entry */
 141     reg_grp_entry = xen_pt_find_reg_grp(s, addr);
 142     if (reg_grp_entry) {
 143         /* check 0-Hardwired register group */
 144         if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {
 145             /* no need to emulate, just return 0 */
 146             val = 0;
 147             goto exit;
 148         }
 149     }
 150
 151     /* read I/O device register value */
 152     rc = xen_host_pci_get_block(&s->real_device, addr, (uint8_t *)&val, len);
 153     if (rc < 0) {
 154         XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);
 155         memset(&val, 0xff, len);
 156     }
 157
 158     /* just return the I/O device register value for
 159      * passthrough type register group */
 160     if (reg_grp_entry == NULL) {
 161         goto exit;
 162     }
 163
 164     /* adjust the read value to appropriate CFC-CFF window */
 165     val <<= (addr & 3) << 3;
 166     emul_len = len;
 167
 168     /* loop around the guest requested size */
 169     while (emul_len > 0) {
 170         /* find register entry to be emulated */
 171         reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);
 172         if (reg_entry) {
 173             XenPTRegInfo *reg = reg_entry->reg;
 174             uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;
 175             uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);
 176             uint8_t *ptr_val = NULL;
 177
 178             valid_mask <<= (find_addr - real_offset) << 3;
 179             ptr_val = (uint8_t *)&val + (real_offset & 3);
 180
 181             /* do emulation based on register size */
 182             switch (reg->size) {
 183             case 1:
 184                 if (reg->u.b.read) {
 185                     rc = reg->u.b.read(s, reg_entry, ptr_val, valid_mask);
 186                 }
 187                 break;
 188             case 2:
 189                 if (reg->u.w.read) {
 190                     rc = reg->u.w.read(s, reg_entry,
 191                                        (uint16_t *)ptr_val, valid_mask);
 192                 }
 193                 break;
 194             case 4:
 195                 if (reg->u.dw.read) {
 196                     rc = reg->u.dw.read(s, reg_entry,
 197                                         (uint32_t *)ptr_val, valid_mask);
 198                 }
 199                 break;
 200             }
 201
 202             if (rc < 0) {
 203                 xen_shutdown_fatal_error("Internal error: Invalid read "
 204                                          "emulation. (%s, rc: %d)\n",
 205                                          __func__, rc);
 206                 return 0;
 207             }
 208
 209             /* calculate next address to find */
 210             emul_len -= reg->size;
 211             if (emul_len > 0) {
 212                 find_addr = real_offset + reg->size;
 213             }
 214         } else {
 215             /* nothing to do with passthrough type register,
 216              * continue to find next byte */
 217             emul_len--;
 218             find_addr++;
 219         }
 220     }
 221
 222     /* need to shift back before returning them to pci bus emulator */
 223     val >>= ((addr & 3) << 3);
 224
 225 exit:
 226     XEN_PT_LOG_CONFIG(d, addr, val, len);
 227     return val;
 228 }
 229
 230 static void xen_pt_pci_write_config(PCIDevice *d, uint32_t addr,
 231                                     uint32_t val, int len)
 232 {
 233     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 234     int index = 0;
 235     XenPTRegGroup *reg_grp_entry = NULL;
 236     int rc = 0;
 237     uint32_t read_val = 0;
 238     int emul_len = 0;
 239     XenPTReg *reg_entry = NULL;
 240     uint32_t find_addr = addr;
 241     XenPTRegInfo *reg = NULL;
 242
 243     if (xen_pt_pci_config_access_check(d, addr, len)) {
 244         return;
 245     }
 246
 247     XEN_PT_LOG_CONFIG(d, addr, val, len);
 248
 249     /* check unused BAR register */
 250     index = xen_pt_bar_offset_to_index(addr);
 251     if ((index >= 0) && (val > 0 && val < XEN_PT_BAR_ALLF) &&
 252         (s->bases[index].bar_flag == XEN_PT_BAR_FLAG_UNUSED)) {
 253         XEN_PT_WARN(d, "Guest attempt to set address to unused Base Address "
 254                     "Register. (addr: 0x%02x, len: %d)\n", addr, len);
 255     }
 256
 257     /* find register group entry */
 258     reg_grp_entry = xen_pt_find_reg_grp(s, addr);
 259     if (reg_grp_entry) {
 260         /* check 0-Hardwired register group */
 261         if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {
 262             /* ignore silently */
 263             XEN_PT_WARN(d, "Access to 0-Hardwired register. "
 264                         "(addr: 0x%02x, len: %d)\n", addr, len);
 265             return;
 266         }
 267     }
 268
 269     rc = xen_host_pci_get_block(&s->real_device, addr,
 270                                 (uint8_t *)&read_val, len);
 271     if (rc < 0) {
 272         XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);
 273         memset(&read_val, 0xff, len);
 274     }
 275
 276     /* pass directly to the real device for passthrough type register group */
 277     if (reg_grp_entry == NULL) {
 278         goto out;
 279     }
 280
 281     memory_region_transaction_begin();
 282     pci_default_write_config(d, addr, val, len);
 283
 284     /* adjust the read and write value to appropriate CFC-CFF window */
 285     read_val <<= (addr & 3) << 3;
 286     val <<= (addr & 3) << 3;
 287     emul_len = len;
 288
 289     /* loop around the guest requested size */
 290     while (emul_len > 0) {
 291         /* find register entry to be emulated */
 292         reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);
 293         if (reg_entry) {
 294             reg = reg_entry->reg;
 295             uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;
 296             uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);
 297             uint8_t *ptr_val = NULL;
 298
 299             valid_mask <<= (find_addr - real_offset) << 3;
 300             ptr_val = (uint8_t *)&val + (real_offset & 3);
 301
 302             /* do emulation based on register size */
 303             switch (reg->size) {
 304             case 1:
 305                 if (reg->u.b.write) {
 306                     rc = reg->u.b.write(s, reg_entry, ptr_val,
 307                                         read_val >> ((real_offset & 3) << 3),
 308                                         valid_mask);
 309                 }
 310                 break;
 311             case 2:
 312                 if (reg->u.w.write) {
 313                     rc = reg->u.w.write(s, reg_entry, (uint16_t *)ptr_val,
 314                                         (read_val >> ((real_offset & 3) << 3)),
 315                                         valid_mask);
 316                 }
 317                 break;
 318             case 4:
 319                 if (reg->u.dw.write) {
 320                     rc = reg->u.dw.write(s, reg_entry, (uint32_t *)ptr_val,
 321                                          (read_val >> ((real_offset & 3) << 3)),
 322                                          valid_mask);
 323                 }
 324                 break;
 325             }
 326
 327             if (rc < 0) {
 328                 xen_shutdown_fatal_error("Internal error: Invalid write"
 329                                          " emulation. (%s, rc: %d)\n",
 330                                          __func__, rc);
 331                 return;
 332             }
 333
 334             /* calculate next address to find */
 335             emul_len -= reg->size;
 336             if (emul_len > 0) {
 337                 find_addr = real_offset + reg->size;
 338             }
 339         } else {
 340             /* nothing to do with passthrough type register,
 341              * continue to find next byte */
 342             emul_len--;
 343             find_addr++;
 344         }
 345     }
 346
 347     /* need to shift back before passing them to xen_host_pci_device */
 348     val >>= (addr & 3) << 3;
 349
 350     memory_region_transaction_commit();
 351
 352 out:
 353     if (!(reg && reg->no_wb)) {
 354         /* unknown regs are passed through */
 355         rc = xen_host_pci_set_block(&s->real_device, addr,
 356                                     (uint8_t *)&val, len);
 357
 358         if (rc < 0) {
 359             XEN_PT_ERR(d, "pci_write_block failed. return value: %d.\n", rc);
 360         }
 361     }
 362 }
 363
 364 /* register regions */
 365
 366 static uint64_t xen_pt_bar_read(void *o, hwaddr addr,
 367                                 unsigned size)
 368 {
 369     PCIDevice *d = o;
 370     /* if this function is called, that probably means that there is a
 371      * misconfiguration of the IOMMU. */
 372     XEN_PT_ERR(d, "Should not read BAR through QEMU. @0x"TARGET_FMT_plx"\n",
 373                addr);
 374     return 0;
 375 }
 376 static void xen_pt_bar_write(void *o, hwaddr addr, uint64_t val,
 377                              unsigned size)
 378 {
 379     PCIDevice *d = o;
 380     /* Same comment as xen_pt_bar_read function */
 381     XEN_PT_ERR(d, "Should not write BAR through QEMU. @0x"TARGET_FMT_plx"\n",
 382                addr);
 383 }
 384
 385 static const MemoryRegionOps ops = {
 386     .endianness = DEVICE_NATIVE_ENDIAN,
 387     .read = xen_pt_bar_read,
 388     .write = xen_pt_bar_write,
 389 };
 390
 391 static int xen_pt_register_regions(XenPCIPassthroughState *s)
 392 {
 393     int i = 0;
 394     XenHostPCIDevice *d = &s->real_device;
 395
 396     /* Register PIO/MMIO BARs */
 397     for (i = 0; i < PCI_ROM_SLOT; i++) {
 398         XenHostPCIIORegion *r = &d->io_regions[i];
 399         uint8_t type;
 400
 401         if (r->base_addr == 0 || r->size == 0) {
 402             continue;
 403         }
 404
 405         s->bases[i].access.u = r->base_addr;
 406
 407         if (r->type & XEN_HOST_PCI_REGION_TYPE_IO) {
 408             type = PCI_BASE_ADDRESS_SPACE_IO;
 409         } else {
 410             type = PCI_BASE_ADDRESS_SPACE_MEMORY;
 411             if (r->type & XEN_HOST_PCI_REGION_TYPE_PREFETCH) {
 412                 type |= PCI_BASE_ADDRESS_MEM_PREFETCH;
 413             }
 414             if (r->type & XEN_HOST_PCI_REGION_TYPE_MEM_64) {
 415                 type |= PCI_BASE_ADDRESS_MEM_TYPE_64;
 416             }
 417         }
 418
 419         memory_region_init_io(&s->bar[i], &ops, &s->dev,
 420                               "xen-pci-pt-bar", r->size);
 421         pci_register_bar(&s->dev, i, type, &s->bar[i]);
 422
 423         XEN_PT_LOG(&s->dev, "IO region %i registered (size=0x%lx"PRIx64
 424                    " base_addr=0x%lx"PRIx64" type: %#x)\n",
 425                    i, r->size, r->base_addr, type);
 426     }
 427
 428     /* Register expansion ROM address */
 429     if (d->rom.base_addr && d->rom.size) {
 430         uint32_t bar_data = 0;
 431
 432         /* Re-set BAR reported by OS, otherwise ROM can't be read. */
 433         if (xen_host_pci_get_long(d, PCI_ROM_ADDRESS, &bar_data)) {
 434             return 0;
 435         }
 436         if ((bar_data & PCI_ROM_ADDRESS_MASK) == 0) {
 437             bar_data |= d->rom.base_addr & PCI_ROM_ADDRESS_MASK;
 438             xen_host_pci_set_long(d, PCI_ROM_ADDRESS, bar_data);
 439         }
 440
 441         s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;
 442
 443         memory_region_init_rom_device(&s->rom, NULL, NULL,
 444                                       "xen-pci-pt-rom", d->rom.size);
 445         pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,
 446                          &s->rom);
 447
 448         XEN_PT_LOG(&s->dev, "Expansion ROM registered (size=0x%08"PRIx64
 449                    " base_addr=0x%08"PRIx64")\n",
 450                    d->rom.size, d->rom.base_addr);
 451     }
 452
 453     return 0;
 454 }
 455
 456 static void xen_pt_unregister_regions(XenPCIPassthroughState *s)
 457 {
 458     XenHostPCIDevice *d = &s->real_device;
 459     int i;
 460
 461     for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
 462         XenHostPCIIORegion *r = &d->io_regions[i];
 463
 464         if (r->base_addr == 0 || r->size == 0) {
 465             continue;
 466         }
 467
 468         memory_region_destroy(&s->bar[i]);
 469     }
 470     if (d->rom.base_addr && d->rom.size) {
 471         memory_region_destroy(&s->rom);
 472     }
 473 }
 474
 475 /* region mapping */
 476
 477 static int xen_pt_bar_from_region(XenPCIPassthroughState *s, MemoryRegion *mr)
 478 {
 479     int i = 0;
 480
 481     for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
 482         if (mr == &s->bar[i]) {
 483             return i;
 484         }
 485     }
 486     if (mr == &s->rom) {
 487         return PCI_ROM_SLOT;
 488     }
 489     return -1;
 490 }
 491
 492 /*
 493  * This function checks if an io_region overlaps an io_region from another
 494  * device.  The io_region to check is provided with (addr, size and type)
 495  * A callback can be provided and will be called for every region that is
 496  * overlapped.
 497  * The return value indicates if the region is overlappsed */
 498 struct CheckBarArgs {
 499     XenPCIPassthroughState *s;
 500     pcibus_t addr;
 501     pcibus_t size;
 502     uint8_t type;
 503     bool rc;
 504 };
 505 static void xen_pt_check_bar_overlap(PCIBus *bus, PCIDevice *d, void *opaque)
 506 {
 507     struct CheckBarArgs *arg = opaque;
 508     XenPCIPassthroughState *s = arg->s;
 509     uint8_t type = arg->type;
 510     int i;
 511
 512     if (d->devfn == s->dev.devfn) {
 513         return;
 514     }
 515
 516     /* xxx: This ignores bridges. */
 517     for (i = 0; i < PCI_NUM_REGIONS; i++) {
 518         const PCIIORegion *r = &d->io_regions[i];
 519
 520         if (!r->size) {
 521             continue;
 522         }
 523         if ((type & PCI_BASE_ADDRESS_SPACE_IO)
 524             != (r->type & PCI_BASE_ADDRESS_SPACE_IO)) {
 525             continue;
 526         }
 527
 528         if (ranges_overlap(arg->addr, arg->size, r->addr, r->size)) {
 529             XEN_PT_WARN(&s->dev,
 530                         "Overlapped to device [%02x:%02x.%d] Region: %i"
 531                         " (addr: %#"FMT_PCIBUS", len: %#"FMT_PCIBUS")\n",
 532                         pci_bus_num(bus), PCI_SLOT(d->devfn),
 533                         PCI_FUNC(d->devfn), i, r->addr, r->size);
 534             arg->rc = true;
 535         }
 536     }
 537 }
 538
 539 static void xen_pt_region_update(XenPCIPassthroughState *s,
 540                                  MemoryRegionSection *sec, bool adding)
 541 {
 542     PCIDevice *d = &s->dev;
 543     MemoryRegion *mr = sec->mr;
 544     int bar = -1;
 545     int rc;
 546     int op = adding ? DPCI_ADD_MAPPING : DPCI_REMOVE_MAPPING;
 547     struct CheckBarArgs args = {
 548         .s = s,
 549         .addr = sec->offset_within_address_space,
 550         .size = sec->size,
 551         .rc = false,
 552     };
 553
 554     bar = xen_pt_bar_from_region(s, mr);
 555     if (bar == -1 && (!s->msix || &s->msix->mmio != mr)) {
 556         return;
 557     }
 558
 559     if (s->msix && &s->msix->mmio == mr) {
 560         if (adding) {
 561             s->msix->mmio_base_addr = sec->offset_within_address_space;
 562             rc = xen_pt_msix_update_remap(s, s->msix->bar_index);
 563         }
 564         return;
 565     }
 566
 567     args.type = d->io_regions[bar].type;
 568     pci_for_each_device(d->bus, pci_bus_num(d->bus),
 569                         xen_pt_check_bar_overlap, &args);
 570     if (args.rc) {
 571         XEN_PT_WARN(d, "Region: %d (addr: %#"FMT_PCIBUS
 572                     ", len: %#"FMT_PCIBUS") is overlapped.\n",
 573                     bar, sec->offset_within_address_space, sec->size);
 574     }
 575
 576     if (d->io_regions[bar].type & PCI_BASE_ADDRESS_SPACE_IO) {
 577         uint32_t guest_port = sec->offset_within_address_space;
 578         uint32_t machine_port = s->bases[bar].access.pio_base;
 579         uint32_t size = sec->size;
 580         rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
 581                                       guest_port, machine_port, size,
 582                                       op);
 583         if (rc) {
 584             XEN_PT_ERR(d, "%s ioport mapping failed! (rc: %i)\n",
 585                        adding ? "create new" : "remove old", rc);
 586         }
 587     } else {
 588         pcibus_t guest_addr = sec->offset_within_address_space;
 589         pcibus_t machine_addr = s->bases[bar].access.maddr
 590             + sec->offset_within_region;
 591         pcibus_t size = sec->size;
 592         rc = xc_domain_memory_mapping(xen_xc, xen_domid,
 593                                       XEN_PFN(guest_addr + XC_PAGE_SIZE - 1),
 594                                       XEN_PFN(machine_addr + XC_PAGE_SIZE - 1),
 595                                       XEN_PFN(size + XC_PAGE_SIZE - 1),
 596                                       op);
 597         if (rc) {
 598             XEN_PT_ERR(d, "%s mem mapping failed! (rc: %i)\n",
 599                        adding ? "create new" : "remove old", rc);
 600         }
 601     }
 602 }
 603
 604 static void xen_pt_region_add(MemoryListener *l, MemoryRegionSection *sec)
 605 {
 606     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 607                                              memory_listener);
 608
 609     xen_pt_region_update(s, sec, true);
 610 }
 611
 612 static void xen_pt_region_del(MemoryListener *l, MemoryRegionSection *sec)
 613 {
 614     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 615                                              memory_listener);
 616
 617     xen_pt_region_update(s, sec, false);
 618 }
 619
 620 static void xen_pt_io_region_add(MemoryListener *l, MemoryRegionSection *sec)
 621 {
 622     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 623                                              io_listener);
 624
 625     xen_pt_region_update(s, sec, true);
 626 }
 627
 628 static void xen_pt_io_region_del(MemoryListener *l, MemoryRegionSection *sec)
 629 {
 630     XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
 631                                              io_listener);
 632
 633     xen_pt_region_update(s, sec, false);
 634 }
 635
 636 static const MemoryListener xen_pt_memory_listener = {
 637     .region_add = xen_pt_region_add,
 638     .region_del = xen_pt_region_del,
 639     .priority = 10,
 640 };
 641
 642 static const MemoryListener xen_pt_io_listener = {
 643     .region_add = xen_pt_io_region_add,
 644     .region_del = xen_pt_io_region_del,
 645     .priority = 10,
 646 };
 647
 648 /* init */
 649
 650 static int xen_pt_initfn(PCIDevice *d)
 651 {
 652     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 653     int rc = 0;
 654     uint8_t machine_irq = 0;
 655     int pirq = XEN_PT_UNASSIGNED_PIRQ;
 656
 657     /* register real device */
 658     XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"
 659                " to devfn %#x\n",
 660                s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function,
 661                s->dev.devfn);
 662
 663     rc = xen_host_pci_device_get(&s->real_device,
 664                                  s->hostaddr.domain, s->hostaddr.bus,
 665                                  s->hostaddr.slot, s->hostaddr.function);
 666     if (rc) {
 667         XEN_PT_ERR(d, "Failed to \"open\" the real pci device. rc: %i\n", rc);
 668         return -1;
 669     }
 670
 671     s->is_virtfn = s->real_device.is_virtfn;
 672     if (s->is_virtfn) {
 673         XEN_PT_LOG(d, "%04x:%02x:%02x.%d is a SR-IOV Virtual Function\n",
 674                    s->real_device.domain, bus, slot, func);
 675     }
 676
 677     /* Initialize virtualized PCI configuration (Extended 256 Bytes) */
 678     if (xen_host_pci_get_block(&s->real_device, 0, d->config,
 679                                PCI_CONFIG_SPACE_SIZE) == -1) {
 680         xen_host_pci_device_put(&s->real_device);
 681         return -1;
 682     }
 683
 684     s->memory_listener = xen_pt_memory_listener;
 685     s->io_listener = xen_pt_io_listener;
 686
 687     /* Handle real device's MMIO/PIO BARs */
 688     xen_pt_register_regions(s);
 689
 690     /* reinitialize each config register to be emulated */
 691     if (xen_pt_config_init(s)) {
 692         XEN_PT_ERR(d, "PCI Config space initialisation failed.\n");
 693         xen_host_pci_device_put(&s->real_device);
 694         return -1;
 695     }
 696
 697     /* Bind interrupt */
 698     if (!s->dev.config[PCI_INTERRUPT_PIN]) {
 699         XEN_PT_LOG(d, "no pin interrupt\n");
 700         goto out;
 701     }
 702
 703     machine_irq = s->real_device.irq;
 704     rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
 705
 706     if (rc < 0) {
 707         XEN_PT_ERR(d, "Mapping machine irq %u to pirq %i failed, (rc: %d)\n",
 708                    machine_irq, pirq, rc);
 709
 710         /* Disable PCI intx assertion (turn on bit10 of devctl) */
 711         xen_host_pci_set_word(&s->real_device,
 712                               PCI_COMMAND,
 713                               pci_get_word(s->dev.config + PCI_COMMAND)
 714                               | PCI_COMMAND_INTX_DISABLE);
 715         machine_irq = 0;
 716         s->machine_irq = 0;
 717     } else {
 718         machine_irq = pirq;
 719         s->machine_irq = pirq;
 720         xen_pt_mapped_machine_irq[machine_irq]++;
 721     }
 722
 723     /* bind machine_irq to device */
 724     if (machine_irq != 0) {
 725         uint8_t e_intx = xen_pt_pci_intx(s);
 726
 727         rc = xc_domain_bind_pt_pci_irq(xen_xc, xen_domid, machine_irq,
 728                                        pci_bus_num(d->bus),
 729                                        PCI_SLOT(d->devfn),
 730                                        e_intx);
 731         if (rc < 0) {
 732             XEN_PT_ERR(d, "Binding of interrupt %i failed! (rc: %d)\n",
 733                        e_intx, rc);
 734
 735             /* Disable PCI intx assertion (turn on bit10 of devctl) */
 736             xen_host_pci_set_word(&s->real_device, PCI_COMMAND,
 737                                   *(uint16_t *)(&s->dev.config[PCI_COMMAND])
 738                                   | PCI_COMMAND_INTX_DISABLE);
 739             xen_pt_mapped_machine_irq[machine_irq]--;
 740
 741             if (xen_pt_mapped_machine_irq[machine_irq] == 0) {
 742                 if (xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq)) {
 743                     XEN_PT_ERR(d, "Unmapping of machine interrupt %i failed!"
 744                                " (rc: %d)\n", machine_irq, rc);
 745                 }
 746             }
 747             s->machine_irq = 0;
 748         }
 749     }
 750
 751 out:
 752     memory_listener_register(&s->memory_listener, &address_space_memory);
 753     memory_listener_register(&s->io_listener, &address_space_io);
 754     XEN_PT_LOG(d, "Real physical device %02x:%02x.%d registered successfuly!\n",
 755                bus, slot, func);
 756
 757     return 0;
 758 }
 759
 760 static void xen_pt_unregister_device(PCIDevice *d)
 761 {
 762     XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
 763     uint8_t machine_irq = s->machine_irq;
 764     uint8_t intx = xen_pt_pci_intx(s);
 765     int rc;
 766
 767     if (machine_irq) {
 768         rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,
 769                                      PT_IRQ_TYPE_PCI,
 770                                      pci_bus_num(d->bus),
 771                                      PCI_SLOT(s->dev.devfn),
 772                                      intx,
 773                                      0 /* isa_irq */);
 774         if (rc < 0) {
 775             XEN_PT_ERR(d, "unbinding of interrupt INT%c failed."
 776                        " (machine irq: %i, rc: %d)"
 777                        " But bravely continuing on..\n",
 778                        'a' + intx, machine_irq, rc);
 779         }
 780     }
 781
 782     if (s->msi) {
 783         xen_pt_msi_disable(s);
 784     }
 785     if (s->msix) {
 786         xen_pt_msix_disable(s);
 787     }
 788
 789     if (machine_irq) {
 790         xen_pt_mapped_machine_irq[machine_irq]--;
 791
 792         if (xen_pt_mapped_machine_irq[machine_irq] == 0) {
 793             rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq);
 794
 795             if (rc < 0) {
 796                 XEN_PT_ERR(d, "unmapping of interrupt %i failed. (rc: %d)"
 797                            " But bravely continuing on..\n",
 798                            machine_irq, rc);
 799             }
 800         }
 801     }
 802
 803     /* delete all emulated config registers */
 804     xen_pt_config_delete(s);
 805
 806     xen_pt_unregister_regions(s);
 807     memory_listener_unregister(&s->memory_listener);
 808     memory_listener_unregister(&s->io_listener);
 809
 810     xen_host_pci_device_put(&s->real_device);
 811 }
 812
 813 static Property xen_pci_passthrough_properties[] = {
 814     DEFINE_PROP_PCI_HOST_DEVADDR("hostaddr", XenPCIPassthroughState, hostaddr),
 815     DEFINE_PROP_END_OF_LIST(),
 816 };
 817
 818 static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)
 819 {
 820     DeviceClass *dc = DEVICE_CLASS(klass);
 821     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 822
 823     k->init = xen_pt_initfn;
 824     k->exit = xen_pt_unregister_device;
 825     k->config_read = xen_pt_pci_read_config;
 826     k->config_write = xen_pt_pci_write_config;
 827     dc->desc = "Assign an host PCI device with Xen";
 828     dc->props = xen_pci_passthrough_properties;
 829 };
 830
 831 static TypeInfo xen_pci_passthrough_info = {
 832     .name = "xen-pci-passthrough",
 833     .parent = TYPE_PCI_DEVICE,
 834     .instance_size = sizeof(XenPCIPassthroughState),
 835     .class_init = xen_pci_passthrough_class_init,
 836 };
 837
 838 static void xen_pci_passthrough_register_types(void)
 839 {
 840     type_register_static(&xen_pci_passthrough_info);
 841 }
 842
 843 type_init(xen_pci_passthrough_register_types)