hw/ivshmem.c

   1 /*
   2  * Inter-VM Shared Memory PCI device.
   3  *
   4  * Author:
   5  *      Cam Macdonell <cam@cs.ualberta.ca>
   6  *
   7  * Based On: cirrus_vga.c
   8  *          Copyright (c) 2004 Fabrice Bellard
   9  *          Copyright (c) 2004 Makoto Suzuki (suzu)
  10  *
  11  *      and rtl8139.c
  12  *          Copyright (c) 2006 Igor Kovalenko
  13  *
  14  * This code is licensed under the GNU GPL v2.
  15  *
  16  * Contributions after 2012-01-13 are licensed under the terms of the
  17  * GNU GPL, version 2 or (at your option) any later version.
  18  */
  19 #include "hw.h"
  20 #include "pc.h"
  21 #include "pci.h"
  22 #include "msix.h"
  23 #include "kvm.h"
  24 #include "migration.h"
  25 #include "qerror.h"
  26 #include "event_notifier.h"
  27
  28 #include <sys/mman.h>
  29 #include <sys/types.h>
  30
  31 #define IVSHMEM_IOEVENTFD   0
  32 #define IVSHMEM_MSI     1
  33
  34 #define IVSHMEM_PEER    0
  35 #define IVSHMEM_MASTER  1
  36
  37 #define IVSHMEM_REG_BAR_SIZE 0x100
  38
  39 //#define DEBUG_IVSHMEM
  40 #ifdef DEBUG_IVSHMEM
  41 #define IVSHMEM_DPRINTF(fmt, ...)        \
  42     do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0)
  43 #else
  44 #define IVSHMEM_DPRINTF(fmt, ...)
  45 #endif
  46
  47 typedef struct Peer {
  48     int nb_eventfds;
  49     EventNotifier *eventfds;
  50 } Peer;
  51
  52 typedef struct EventfdEntry {
  53     PCIDevice *pdev;
  54     int vector;
  55 } EventfdEntry;
  56
  57 typedef struct IVShmemState {
  58     PCIDevice dev;
  59     uint32_t intrmask;
  60     uint32_t intrstatus;
  61     uint32_t doorbell;
  62
  63     CharDriverState **eventfd_chr;
  64     CharDriverState *server_chr;
  65     MemoryRegion ivshmem_mmio;
  66
  67     /* We might need to register the BAR before we actually have the memory.
  68      * So prepare a container MemoryRegion for the BAR immediately and
  69      * add a subregion when we have the memory.
  70      */
  71     MemoryRegion bar;
  72     MemoryRegion ivshmem;
  73     MemoryRegion msix_bar;
  74     uint64_t ivshmem_size; /* size of shared memory region */
  75     int shm_fd; /* shared memory file descriptor */
  76
  77     Peer *peers;
  78     int nb_peers; /* how many guests we have space for */
  79     int max_peer; /* maximum numbered peer */
  80
  81     int vm_id;
  82     uint32_t vectors;
  83     uint32_t features;
  84     EventfdEntry *eventfd_table;
  85
  86     Error *migration_blocker;
  87
  88     char * shmobj;
  89     char * sizearg;
  90     char * role;
  91     int role_val;   /* scalar to avoid multiple string comparisons */
  92 } IVShmemState;
  93
  94 /* registers for the Inter-VM shared memory device */
  95 enum ivshmem_registers {
  96     INTRMASK = 0,
  97     INTRSTATUS = 4,
  98     IVPOSITION = 8,
  99     DOORBELL = 12,
 100 };
 101
 102 static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
 103                                                     unsigned int feature) {
 104     return (ivs->features & (1 << feature));
 105 }
 106
 107 static inline bool is_power_of_two(uint64_t x) {
 108     return (x & (x - 1)) == 0;
 109 }
 110
 111 /* accessing registers - based on rtl8139 */
 112 static void ivshmem_update_irq(IVShmemState *s, int val)
 113 {
 114     int isr;
 115     isr = (s->intrstatus & s->intrmask) & 0xffffffff;
 116
 117     /* don't print ISR resets */
 118     if (isr) {
 119         IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
 120            isr ? 1 : 0, s->intrstatus, s->intrmask);
 121     }
 122
 123     qemu_set_irq(s->dev.irq[0], (isr != 0));
 124 }
 125
 126 static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
 127 {
 128     IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
 129
 130     s->intrmask = val;
 131
 132     ivshmem_update_irq(s, val);
 133 }
 134
 135 static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
 136 {
 137     uint32_t ret = s->intrmask;
 138
 139     IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
 140
 141     return ret;
 142 }
 143
 144 static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
 145 {
 146     IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
 147
 148     s->intrstatus = val;
 149
 150     ivshmem_update_irq(s, val);
 151     return;
 152 }
 153
 154 static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
 155 {
 156     uint32_t ret = s->intrstatus;
 157
 158     /* reading ISR clears all interrupts */
 159     s->intrstatus = 0;
 160
 161     ivshmem_update_irq(s, 0);
 162
 163     return ret;
 164 }
 165
 166 static void ivshmem_io_write(void *opaque, target_phys_addr_t addr,
 167                              uint64_t val, unsigned size)
 168 {
 169     IVShmemState *s = opaque;
 170
 171     uint16_t dest = val >> 16;
 172     uint16_t vector = val & 0xff;
 173
 174     addr &= 0xfc;
 175
 176     IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
 177     switch (addr)
 178     {
 179         case INTRMASK:
 180             ivshmem_IntrMask_write(s, val);
 181             break;
 182
 183         case INTRSTATUS:
 184             ivshmem_IntrStatus_write(s, val);
 185             break;
 186
 187         case DOORBELL:
 188             /* check that dest VM ID is reasonable */
 189             if (dest > s->max_peer) {
 190                 IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
 191                 break;
 192             }
 193
 194             /* check doorbell range */
 195             if (vector < s->peers[dest].nb_eventfds) {
 196                 IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
 197                 event_notifier_set(&s->peers[dest].eventfds[vector]);
 198             }
 199             break;
 200         default:
 201             IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
 202     }
 203 }
 204
 205 static uint64_t ivshmem_io_read(void *opaque, target_phys_addr_t addr,
 206                                 unsigned size)
 207 {
 208
 209     IVShmemState *s = opaque;
 210     uint32_t ret;
 211
 212     switch (addr)
 213     {
 214         case INTRMASK:
 215             ret = ivshmem_IntrMask_read(s);
 216             break;
 217
 218         case INTRSTATUS:
 219             ret = ivshmem_IntrStatus_read(s);
 220             break;
 221
 222         case IVPOSITION:
 223             /* return my VM ID if the memory is mapped */
 224             if (s->shm_fd > 0) {
 225                 ret = s->vm_id;
 226             } else {
 227                 ret = -1;
 228             }
 229             break;
 230
 231         default:
 232             IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
 233             ret = 0;
 234     }
 235
 236     return ret;
 237 }
 238
 239 static const MemoryRegionOps ivshmem_mmio_ops = {
 240     .read = ivshmem_io_read,
 241     .write = ivshmem_io_write,
 242     .endianness = DEVICE_NATIVE_ENDIAN,
 243     .impl = {
 244         .min_access_size = 4,
 245         .max_access_size = 4,
 246     },
 247 };
 248
 249 static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
 250 {
 251     IVShmemState *s = opaque;
 252
 253     ivshmem_IntrStatus_write(s, *buf);
 254
 255     IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
 256 }
 257
 258 static int ivshmem_can_receive(void * opaque)
 259 {
 260     return 8;
 261 }
 262
 263 static void ivshmem_event(void *opaque, int event)
 264 {
 265     IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
 266 }
 267
 268 static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
 269
 270     EventfdEntry *entry = opaque;
 271     PCIDevice *pdev = entry->pdev;
 272
 273     IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
 274     msix_notify(pdev, entry->vector);
 275 }
 276
 277 static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
 278                                                   int vector)
 279 {
 280     /* create a event character device based on the passed eventfd */
 281     IVShmemState *s = opaque;
 282     CharDriverState * chr;
 283     int eventfd = event_notifier_get_fd(n);
 284
 285     chr = qemu_chr_open_eventfd(eventfd);
 286
 287     if (chr == NULL) {
 288         fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
 289         exit(-1);
 290     }
 291
 292     /* if MSI is supported we need multiple interrupts */
 293     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 294         s->eventfd_table[vector].pdev = &s->dev;
 295         s->eventfd_table[vector].vector = vector;
 296
 297         qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
 298                       ivshmem_event, &s->eventfd_table[vector]);
 299     } else {
 300         qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
 301                       ivshmem_event, s);
 302     }
 303
 304     return chr;
 305
 306 }
 307
 308 static int check_shm_size(IVShmemState *s, int fd) {
 309     /* check that the guest isn't going to try and map more memory than the
 310      * the object has allocated return -1 to indicate error */
 311
 312     struct stat buf;
 313
 314     fstat(fd, &buf);
 315
 316     if (s->ivshmem_size > buf.st_size) {
 317         fprintf(stderr,
 318                 "IVSHMEM ERROR: Requested memory size greater"
 319                 " than shared object size (%" PRIu64 " > %" PRIu64")\n",
 320                 s->ivshmem_size, (uint64_t)buf.st_size);
 321         return -1;
 322     } else {
 323         return 0;
 324     }
 325 }
 326
 327 /* create the shared memory BAR when we are not using the server, so we can
 328  * create the BAR and map the memory immediately */
 329 static void create_shared_memory_BAR(IVShmemState *s, int fd) {
 330
 331     void * ptr;
 332
 333     s->shm_fd = fd;
 334
 335     ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
 336
 337     memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2",
 338                                s->ivshmem_size, ptr);
 339     vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
 340     memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
 341
 342     /* region for shared memory */
 343     pci_register_bar(&s->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
 344 }
 345
 346 static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
 347 {
 348     memory_region_add_eventfd(&s->ivshmem_mmio,
 349                               DOORBELL,
 350                               4,
 351                               true,
 352                               (posn << 16) | i,
 353                               event_notifier_get_fd(&s->peers[posn].eventfds[i]));
 354 }
 355
 356 static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i)
 357 {
 358     memory_region_del_eventfd(&s->ivshmem_mmio,
 359                               DOORBELL,
 360                               4,
 361                               true,
 362                               (posn << 16) | i,
 363                               event_notifier_get_fd(&s->peers[posn].eventfds[i]));
 364 }
 365
 366 static void close_guest_eventfds(IVShmemState *s, int posn)
 367 {
 368     int i, guest_curr_max;
 369
 370     guest_curr_max = s->peers[posn].nb_eventfds;
 371
 372     for (i = 0; i < guest_curr_max; i++) {
 373         ivshmem_del_eventfd(s, posn, i);
 374         event_notifier_cleanup(&s->peers[posn].eventfds[i]);
 375     }
 376
 377     g_free(s->peers[posn].eventfds);
 378     s->peers[posn].nb_eventfds = 0;
 379 }
 380
 381 static void setup_ioeventfds(IVShmemState *s) {
 382
 383     int i, j;
 384
 385     for (i = 0; i <= s->max_peer; i++) {
 386         for (j = 0; j < s->peers[i].nb_eventfds; j++) {
 387             ivshmem_add_eventfd(s, i, j);
 388         }
 389     }
 390 }
 391
 392 /* this function increase the dynamic storage need to store data about other
 393  * guests */
 394 static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
 395
 396     int j, old_nb_alloc;
 397
 398     old_nb_alloc = s->nb_peers;
 399
 400     while (new_min_size >= s->nb_peers)
 401         s->nb_peers = s->nb_peers * 2;
 402
 403     IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
 404     s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
 405
 406     /* zero out new pointers */
 407     for (j = old_nb_alloc; j < s->nb_peers; j++) {
 408         s->peers[j].eventfds = NULL;
 409         s->peers[j].nb_eventfds = 0;
 410     }
 411 }
 412
 413 static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
 414 {
 415     IVShmemState *s = opaque;
 416     int incoming_fd, tmp_fd;
 417     int guest_max_eventfd;
 418     long incoming_posn;
 419
 420     memcpy(&incoming_posn, buf, sizeof(long));
 421     /* pick off s->server_chr->msgfd and store it, posn should accompany msg */
 422     tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr);
 423     IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
 424
 425     /* make sure we have enough space for this guest */
 426     if (incoming_posn >= s->nb_peers) {
 427         increase_dynamic_storage(s, incoming_posn);
 428     }
 429
 430     if (tmp_fd == -1) {
 431         /* if posn is positive and unseen before then this is our posn*/
 432         if ((incoming_posn >= 0) &&
 433                             (s->peers[incoming_posn].eventfds == NULL)) {
 434             /* receive our posn */
 435             s->vm_id = incoming_posn;
 436             return;
 437         } else {
 438             /* otherwise an fd == -1 means an existing guest has gone away */
 439             IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
 440             close_guest_eventfds(s, incoming_posn);
 441             return;
 442         }
 443     }
 444
 445     /* because of the implementation of get_msgfd, we need a dup */
 446     incoming_fd = dup(tmp_fd);
 447
 448     if (incoming_fd == -1) {
 449         fprintf(stderr, "could not allocate file descriptor %s\n",
 450                                                             strerror(errno));
 451         return;
 452     }
 453
 454     /* if the position is -1, then it's shared memory region fd */
 455     if (incoming_posn == -1) {
 456
 457         void * map_ptr;
 458
 459         s->max_peer = 0;
 460
 461         if (check_shm_size(s, incoming_fd) == -1) {
 462             exit(-1);
 463         }
 464
 465         /* mmap the region and map into the BAR2 */
 466         map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
 467                                                             incoming_fd, 0);
 468         memory_region_init_ram_ptr(&s->ivshmem,
 469                                    "ivshmem.bar2", s->ivshmem_size, map_ptr);
 470         vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
 471
 472         IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n",
 473                          s->ivshmem_offset, s->ivshmem_size);
 474
 475         memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
 476
 477         /* only store the fd if it is successfully mapped */
 478         s->shm_fd = incoming_fd;
 479
 480         return;
 481     }
 482
 483     /* each guest has an array of eventfds, and we keep track of how many
 484      * guests for each VM */
 485     guest_max_eventfd = s->peers[incoming_posn].nb_eventfds;
 486
 487     if (guest_max_eventfd == 0) {
 488         /* one eventfd per MSI vector */
 489         s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors);
 490     }
 491
 492     /* this is an eventfd for a particular guest VM */
 493     IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
 494                                             guest_max_eventfd, incoming_fd);
 495     event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd],
 496                            incoming_fd);
 497
 498     /* increment count for particular guest */
 499     s->peers[incoming_posn].nb_eventfds++;
 500
 501     /* keep track of the maximum VM ID */
 502     if (incoming_posn > s->max_peer) {
 503         s->max_peer = incoming_posn;
 504     }
 505
 506     if (incoming_posn == s->vm_id) {
 507         s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
 508                    &s->peers[s->vm_id].eventfds[guest_max_eventfd],
 509                    guest_max_eventfd);
 510     }
 511
 512     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 513         ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd);
 514     }
 515
 516     return;
 517 }
 518
 519 /* Select the MSI-X vectors used by device.
 520  * ivshmem maps events to vectors statically, so
 521  * we just enable all vectors on init and after reset. */
 522 static void ivshmem_use_msix(IVShmemState * s)
 523 {
 524     int i;
 525
 526     if (!msix_present(&s->dev)) {
 527         return;
 528     }
 529
 530     for (i = 0; i < s->vectors; i++) {
 531         msix_vector_use(&s->dev, i);
 532     }
 533 }
 534
 535 static void ivshmem_reset(DeviceState *d)
 536 {
 537     IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
 538
 539     s->intrstatus = 0;
 540     ivshmem_use_msix(s);
 541     return;
 542 }
 543
 544 static uint64_t ivshmem_get_size(IVShmemState * s) {
 545
 546     uint64_t value;
 547     char *ptr;
 548
 549     value = strtoull(s->sizearg, &ptr, 10);
 550     switch (*ptr) {
 551         case 0: case 'M': case 'm':
 552             value <<= 20;
 553             break;
 554         case 'G': case 'g':
 555             value <<= 30;
 556             break;
 557         default:
 558             fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
 559             exit(1);
 560     }
 561
 562     /* BARs must be a power of 2 */
 563     if (!is_power_of_two(value)) {
 564         fprintf(stderr, "ivshmem: size must be power of 2\n");
 565         exit(1);
 566     }
 567
 568     return value;
 569 }
 570
 571 static void ivshmem_setup_msi(IVShmemState * s)
 572 {
 573     memory_region_init(&s->msix_bar, "ivshmem-msix", 4096);
 574     if (!msix_init(&s->dev, s->vectors, &s->msix_bar, 1, 0)) {
 575         pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,
 576                          &s->msix_bar);
 577         IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
 578     } else {
 579         IVSHMEM_DPRINTF("msix initialization failed\n");
 580         exit(1);
 581     }
 582
 583     /* allocate QEMU char devices for receiving interrupts */
 584     s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
 585
 586     ivshmem_use_msix(s);
 587 }
 588
 589 static void ivshmem_save(QEMUFile* f, void *opaque)
 590 {
 591     IVShmemState *proxy = opaque;
 592
 593     IVSHMEM_DPRINTF("ivshmem_save\n");
 594     pci_device_save(&proxy->dev, f);
 595
 596     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
 597         msix_save(&proxy->dev, f);
 598     } else {
 599         qemu_put_be32(f, proxy->intrstatus);
 600         qemu_put_be32(f, proxy->intrmask);
 601     }
 602
 603 }
 604
 605 static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
 606 {
 607     IVSHMEM_DPRINTF("ivshmem_load\n");
 608
 609     IVShmemState *proxy = opaque;
 610     int ret;
 611
 612     if (version_id > 0) {
 613         return -EINVAL;
 614     }
 615
 616     if (proxy->role_val == IVSHMEM_PEER) {
 617         fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
 618         return -EINVAL;
 619     }
 620
 621     ret = pci_device_load(&proxy->dev, f);
 622     if (ret) {
 623         return ret;
 624     }
 625
 626     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
 627         msix_load(&proxy->dev, f);
 628         ivshmem_use_msix(proxy);
 629     } else {
 630         proxy->intrstatus = qemu_get_be32(f);
 631         proxy->intrmask = qemu_get_be32(f);
 632     }
 633
 634     return 0;
 635 }
 636
 637 static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
 638                                  uint32_t val, int len)
 639 {
 640     pci_default_write_config(pci_dev, address, val, len);
 641     msix_write_config(pci_dev, address, val, len);
 642 }
 643
 644 static int pci_ivshmem_init(PCIDevice *dev)
 645 {
 646     IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
 647     uint8_t *pci_conf;
 648
 649     if (s->sizearg == NULL)
 650         s->ivshmem_size = 4 << 20; /* 4 MB default */
 651     else {
 652         s->ivshmem_size = ivshmem_get_size(s);
 653     }
 654
 655     register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
 656                                                                         dev);
 657
 658     /* IRQFD requires MSI */
 659     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
 660         !ivshmem_has_feature(s, IVSHMEM_MSI)) {
 661         fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
 662         exit(1);
 663     }
 664
 665     /* check that role is reasonable */
 666     if (s->role) {
 667         if (strncmp(s->role, "peer", 5) == 0) {
 668             s->role_val = IVSHMEM_PEER;
 669         } else if (strncmp(s->role, "master", 7) == 0) {
 670             s->role_val = IVSHMEM_MASTER;
 671         } else {
 672             fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
 673             exit(1);
 674         }
 675     } else {
 676         s->role_val = IVSHMEM_MASTER; /* default */
 677     }
 678
 679     if (s->role_val == IVSHMEM_PEER) {
 680         error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, "ivshmem", "peer mode");
 681         migrate_add_blocker(s->migration_blocker);
 682     }
 683
 684     pci_conf = s->dev.config;
 685     pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 686
 687     pci_config_set_interrupt_pin(pci_conf, 1);
 688
 689     s->shm_fd = 0;
 690
 691     memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s,
 692                           "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
 693
 694     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 695         setup_ioeventfds(s);
 696     }
 697
 698     /* region for registers*/
 699     pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
 700                      &s->ivshmem_mmio);
 701
 702     memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size);
 703
 704     if ((s->server_chr != NULL) &&
 705                         (strncmp(s->server_chr->filename, "unix:", 5) == 0)) {
 706         /* if we get a UNIX socket as the parameter we will talk
 707          * to the ivshmem server to receive the memory region */
 708
 709         if (s->shmobj != NULL) {
 710             fprintf(stderr, "WARNING: do not specify both 'chardev' "
 711                                                 "and 'shm' with ivshmem\n");
 712         }
 713
 714         IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
 715                                                     s->server_chr->filename);
 716
 717         if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 718             ivshmem_setup_msi(s);
 719         }
 720
 721         /* we allocate enough space for 16 guests and grow as needed */
 722         s->nb_peers = 16;
 723         s->vm_id = -1;
 724
 725         /* allocate/initialize space for interrupt handling */
 726         s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
 727
 728         pci_register_bar(&s->dev, 2,
 729                          PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
 730
 731         s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
 732
 733         qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read,
 734                      ivshmem_event, s);
 735     } else {
 736         /* just map the file immediately, we're not using a server */
 737         int fd;
 738
 739         if (s->shmobj == NULL) {
 740             fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
 741         }
 742
 743         IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
 744
 745         /* try opening with O_EXCL and if it succeeds zero the memory
 746          * by truncating to 0 */
 747         if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
 748                         S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
 749            /* truncate file to length PCI device's memory */
 750             if (ftruncate(fd, s->ivshmem_size) != 0) {
 751                 fprintf(stderr, "ivshmem: could not truncate shared file\n");
 752             }
 753
 754         } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
 755                         S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
 756             fprintf(stderr, "ivshmem: could not open shared file\n");
 757             exit(-1);
 758
 759         }
 760
 761         if (check_shm_size(s, fd) == -1) {
 762             exit(-1);
 763         }
 764
 765         create_shared_memory_BAR(s, fd);
 766
 767     }
 768
 769     s->dev.config_write = ivshmem_write_config;
 770
 771     return 0;
 772 }
 773
 774 static int pci_ivshmem_uninit(PCIDevice *dev)
 775 {
 776     IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
 777
 778     if (s->migration_blocker) {
 779         migrate_del_blocker(s->migration_blocker);
 780         error_free(s->migration_blocker);
 781     }
 782
 783     memory_region_destroy(&s->ivshmem_mmio);
 784     memory_region_del_subregion(&s->bar, &s->ivshmem);
 785     vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev);
 786     memory_region_destroy(&s->ivshmem);
 787     memory_region_destroy(&s->bar);
 788     unregister_savevm(&dev->qdev, "ivshmem", s);
 789
 790     return 0;
 791 }
 792
 793 static Property ivshmem_properties[] = {
 794     DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
 795     DEFINE_PROP_STRING("size", IVShmemState, sizearg),
 796     DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
 797     DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false),
 798     DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
 799     DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
 800     DEFINE_PROP_STRING("role", IVShmemState, role),
 801     DEFINE_PROP_END_OF_LIST(),
 802 };
 803
 804 static void ivshmem_class_init(ObjectClass *klass, void *data)
 805 {
 806     DeviceClass *dc = DEVICE_CLASS(klass);
 807     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 808
 809     k->init = pci_ivshmem_init;
 810     k->exit = pci_ivshmem_uninit;
 811     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 812     k->device_id = 0x1110;
 813     k->class_id = PCI_CLASS_MEMORY_RAM;
 814     dc->reset = ivshmem_reset;
 815     dc->props = ivshmem_properties;
 816 }
 817
 818 static TypeInfo ivshmem_info = {
 819     .name          = "ivshmem",
 820     .parent        = TYPE_PCI_DEVICE,
 821     .instance_size = sizeof(IVShmemState),
 822     .class_init    = ivshmem_class_init,
 823 };
 824
 825 static void ivshmem_register_types(void)
 826 {
 827     type_register_static(&ivshmem_info);
 828 }
 829
 830 type_init(ivshmem_register_types)