hw/misc/ivshmem.c

   1 /*
   2  * Inter-VM Shared Memory PCI device.
   3  *
   4  * Author:
   5  *      Cam Macdonell <[email protected]>
   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 "qemu/osdep.h"
  20 #include "qapi/error.h"
  21 #include "qemu/cutils.h"
  22 #include "hw/hw.h"
  23 #include "hw/i386/pc.h"
  24 #include "hw/pci/pci.h"
  25 #include "hw/pci/msi.h"
  26 #include "hw/pci/msix.h"
  27 #include "sysemu/kvm.h"
  28 #include "migration/migration.h"
  29 #include "qemu/error-report.h"
  30 #include "qemu/event_notifier.h"
  31 #include "qom/object_interfaces.h"
  32 #include "sysemu/char.h"
  33 #include "sysemu/hostmem.h"
  34 #include "sysemu/qtest.h"
  35 #include "qapi/visitor.h"
  36
  37 #include "hw/misc/ivshmem.h"
  38
  39 #define PCI_VENDOR_ID_IVSHMEM   PCI_VENDOR_ID_REDHAT_QUMRANET
  40 #define PCI_DEVICE_ID_IVSHMEM   0x1110
  41
  42 #define IVSHMEM_MAX_PEERS UINT16_MAX
  43 #define IVSHMEM_IOEVENTFD   0
  44 #define IVSHMEM_MSI     1
  45
  46 #define IVSHMEM_REG_BAR_SIZE 0x100
  47
  48 #define IVSHMEM_DEBUG 0
  49 #define IVSHMEM_DPRINTF(fmt, ...)                       \
  50     do {                                                \
  51         if (IVSHMEM_DEBUG) {                            \
  52             printf("IVSHMEM: " fmt, ## __VA_ARGS__);    \
  53         }                                               \
  54     } while (0)
  55
  56 #define TYPE_IVSHMEM_COMMON "ivshmem-common"
  57 #define IVSHMEM_COMMON(obj) \
  58     OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_COMMON)
  59
  60 #define TYPE_IVSHMEM_PLAIN "ivshmem-plain"
  61 #define IVSHMEM_PLAIN(obj) \
  62     OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_PLAIN)
  63
  64 #define TYPE_IVSHMEM_DOORBELL "ivshmem-doorbell"
  65 #define IVSHMEM_DOORBELL(obj) \
  66     OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_DOORBELL)
  67
  68 #define TYPE_IVSHMEM "ivshmem"
  69 #define IVSHMEM(obj) \
  70     OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM)
  71
  72 typedef struct Peer {
  73     int nb_eventfds;
  74     EventNotifier *eventfds;
  75 } Peer;
  76
  77 typedef struct MSIVector {
  78     PCIDevice *pdev;
  79     int virq;
  80 } MSIVector;
  81
  82 typedef struct IVShmemState {
  83     /*< private >*/
  84     PCIDevice parent_obj;
  85     /*< public >*/
  86
  87     uint32_t features;
  88
  89     /* exactly one of these two may be set */
  90     HostMemoryBackend *hostmem; /* with interrupts */
  91     CharDriverState *server_chr; /* without interrupts */
  92
  93     /* registers */
  94     uint32_t intrmask;
  95     uint32_t intrstatus;
  96     int vm_id;
  97
  98     /* BARs */
  99     MemoryRegion ivshmem_mmio;  /* BAR 0 (registers) */
 100     MemoryRegion *ivshmem_bar2; /* BAR 2 (shared memory) */
 101     MemoryRegion server_bar2;   /* used with server_chr */
 102
 103     /* interrupt support */
 104     Peer *peers;
 105     int nb_peers;               /* space in @peers[] */
 106     uint32_t vectors;
 107     MSIVector *msi_vectors;
 108     uint64_t msg_buf;           /* buffer for receiving server messages */
 109     int msg_buffered_bytes;     /* #bytes in @msg_buf */
 110
 111     /* migration stuff */
 112     OnOffAuto master;
 113     Error *migration_blocker;
 114
 115     /* legacy cruft */
 116     char *role;
 117     char *shmobj;
 118     char *sizearg;
 119     size_t legacy_size;
 120     uint32_t not_legacy_32bit;
 121 } IVShmemState;
 122
 123 /* registers for the Inter-VM shared memory device */
 124 enum ivshmem_registers {
 125     INTRMASK = 0,
 126     INTRSTATUS = 4,
 127     IVPOSITION = 8,
 128     DOORBELL = 12,
 129 };
 130
 131 static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
 132                                                     unsigned int feature) {
 133     return (ivs->features & (1 << feature));
 134 }
 135
 136 static inline bool ivshmem_is_master(IVShmemState *s)
 137 {
 138     assert(s->master != ON_OFF_AUTO_AUTO);
 139     return s->master == ON_OFF_AUTO_ON;
 140 }
 141
 142 static void ivshmem_update_irq(IVShmemState *s)
 143 {
 144     PCIDevice *d = PCI_DEVICE(s);
 145     uint32_t isr = s->intrstatus & s->intrmask;
 146
 147     /*
 148      * Do nothing unless the device actually uses INTx.  Here's how
 149      * the device variants signal interrupts, what they put in PCI
 150      * config space:
 151      * Device variant    Interrupt  Interrupt Pin  MSI-X cap.
 152      * ivshmem-plain         none            0         no
 153      * ivshmem-doorbell     MSI-X            1        yes(1)
 154      * ivshmem,msi=off       INTx            1         no
 155      * ivshmem,msi=on       MSI-X            1(2)     yes(1)
 156      * (1) if guest enabled MSI-X
 157      * (2) the device lies
 158      * Leads to the condition for doing nothing:
 159      */
 160     if (ivshmem_has_feature(s, IVSHMEM_MSI)
 161         || !d->config[PCI_INTERRUPT_PIN]) {
 162         return;
 163     }
 164
 165     /* don't print ISR resets */
 166     if (isr) {
 167         IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
 168                         isr ? 1 : 0, s->intrstatus, s->intrmask);
 169     }
 170
 171     pci_set_irq(d, isr != 0);
 172 }
 173
 174 static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
 175 {
 176     IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
 177
 178     s->intrmask = val;
 179     ivshmem_update_irq(s);
 180 }
 181
 182 static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
 183 {
 184     uint32_t ret = s->intrmask;
 185
 186     IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
 187     return ret;
 188 }
 189
 190 static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
 191 {
 192     IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
 193
 194     s->intrstatus = val;
 195     ivshmem_update_irq(s);
 196 }
 197
 198 static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
 199 {
 200     uint32_t ret = s->intrstatus;
 201
 202     /* reading ISR clears all interrupts */
 203     s->intrstatus = 0;
 204     ivshmem_update_irq(s);
 205     return ret;
 206 }
 207
 208 static void ivshmem_io_write(void *opaque, hwaddr addr,
 209                              uint64_t val, unsigned size)
 210 {
 211     IVShmemState *s = opaque;
 212
 213     uint16_t dest = val >> 16;
 214     uint16_t vector = val & 0xff;
 215
 216     addr &= 0xfc;
 217
 218     IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
 219     switch (addr)
 220     {
 221         case INTRMASK:
 222             ivshmem_IntrMask_write(s, val);
 223             break;
 224
 225         case INTRSTATUS:
 226             ivshmem_IntrStatus_write(s, val);
 227             break;
 228
 229         case DOORBELL:
 230             /* check that dest VM ID is reasonable */
 231             if (dest >= s->nb_peers) {
 232                 IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
 233                 break;
 234             }
 235
 236             /* check doorbell range */
 237             if (vector < s->peers[dest].nb_eventfds) {
 238                 IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
 239                 event_notifier_set(&s->peers[dest].eventfds[vector]);
 240             } else {
 241                 IVSHMEM_DPRINTF("Invalid destination vector %d on VM %d\n",
 242                                 vector, dest);
 243             }
 244             break;
 245         default:
 246             IVSHMEM_DPRINTF("Unhandled write " TARGET_FMT_plx "\n", addr);
 247     }
 248 }
 249
 250 static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
 251                                 unsigned size)
 252 {
 253
 254     IVShmemState *s = opaque;
 255     uint32_t ret;
 256
 257     switch (addr)
 258     {
 259         case INTRMASK:
 260             ret = ivshmem_IntrMask_read(s);
 261             break;
 262
 263         case INTRSTATUS:
 264             ret = ivshmem_IntrStatus_read(s);
 265             break;
 266
 267         case IVPOSITION:
 268             ret = s->vm_id;
 269             break;
 270
 271         default:
 272             IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
 273             ret = 0;
 274     }
 275
 276     return ret;
 277 }
 278
 279 static const MemoryRegionOps ivshmem_mmio_ops = {
 280     .read = ivshmem_io_read,
 281     .write = ivshmem_io_write,
 282     .endianness = DEVICE_NATIVE_ENDIAN,
 283     .impl = {
 284         .min_access_size = 4,
 285         .max_access_size = 4,
 286     },
 287 };
 288
 289 static void ivshmem_vector_notify(void *opaque)
 290 {
 291     MSIVector *entry = opaque;
 292     PCIDevice *pdev = entry->pdev;
 293     IVShmemState *s = IVSHMEM_COMMON(pdev);
 294     int vector = entry - s->msi_vectors;
 295     EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
 296
 297     if (!event_notifier_test_and_clear(n)) {
 298         return;
 299     }
 300
 301     IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, vector);
 302     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 303         if (msix_enabled(pdev)) {
 304             msix_notify(pdev, vector);
 305         }
 306     } else {
 307         ivshmem_IntrStatus_write(s, 1);
 308     }
 309 }
 310
 311 static int ivshmem_vector_unmask(PCIDevice *dev, unsigned vector,
 312                                  MSIMessage msg)
 313 {
 314     IVShmemState *s = IVSHMEM_COMMON(dev);
 315     EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
 316     MSIVector *v = &s->msi_vectors[vector];
 317     int ret;
 318
 319     IVSHMEM_DPRINTF("vector unmask %p %d\n", dev, vector);
 320
 321     ret = kvm_irqchip_update_msi_route(kvm_state, v->virq, msg, dev);
 322     if (ret < 0) {
 323         return ret;
 324     }
 325
 326     return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, v->virq);
 327 }
 328
 329 static void ivshmem_vector_mask(PCIDevice *dev, unsigned vector)
 330 {
 331     IVShmemState *s = IVSHMEM_COMMON(dev);
 332     EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
 333     int ret;
 334
 335     IVSHMEM_DPRINTF("vector mask %p %d\n", dev, vector);
 336
 337     ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n,
 338                                                 s->msi_vectors[vector].virq);
 339     if (ret != 0) {
 340         error_report("remove_irqfd_notifier_gsi failed");
 341     }
 342 }
 343
 344 static void ivshmem_vector_poll(PCIDevice *dev,
 345                                 unsigned int vector_start,
 346                                 unsigned int vector_end)
 347 {
 348     IVShmemState *s = IVSHMEM_COMMON(dev);
 349     unsigned int vector;
 350
 351     IVSHMEM_DPRINTF("vector poll %p %d-%d\n", dev, vector_start, vector_end);
 352
 353     vector_end = MIN(vector_end, s->vectors);
 354
 355     for (vector = vector_start; vector < vector_end; vector++) {
 356         EventNotifier *notifier = &s->peers[s->vm_id].eventfds[vector];
 357
 358         if (!msix_is_masked(dev, vector)) {
 359             continue;
 360         }
 361
 362         if (event_notifier_test_and_clear(notifier)) {
 363             msix_set_pending(dev, vector);
 364         }
 365     }
 366 }
 367
 368 static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
 369                                  int vector)
 370 {
 371     int eventfd = event_notifier_get_fd(n);
 372
 373     assert(!s->msi_vectors[vector].pdev);
 374     s->msi_vectors[vector].pdev = PCI_DEVICE(s);
 375
 376     qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
 377                         NULL, &s->msi_vectors[vector]);
 378 }
 379
 380 static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
 381 {
 382     memory_region_add_eventfd(&s->ivshmem_mmio,
 383                               DOORBELL,
 384                               4,
 385                               true,
 386                               (posn << 16) | i,
 387                               &s->peers[posn].eventfds[i]);
 388 }
 389
 390 static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i)
 391 {
 392     memory_region_del_eventfd(&s->ivshmem_mmio,
 393                               DOORBELL,
 394                               4,
 395                               true,
 396                               (posn << 16) | i,
 397                               &s->peers[posn].eventfds[i]);
 398 }
 399
 400 static void close_peer_eventfds(IVShmemState *s, int posn)
 401 {
 402     int i, n;
 403
 404     assert(posn >= 0 && posn < s->nb_peers);
 405     n = s->peers[posn].nb_eventfds;
 406
 407     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 408         memory_region_transaction_begin();
 409         for (i = 0; i < n; i++) {
 410             ivshmem_del_eventfd(s, posn, i);
 411         }
 412         memory_region_transaction_commit();
 413     }
 414
 415     for (i = 0; i < n; i++) {
 416         event_notifier_cleanup(&s->peers[posn].eventfds[i]);
 417     }
 418
 419     g_free(s->peers[posn].eventfds);
 420     s->peers[posn].nb_eventfds = 0;
 421 }
 422
 423 static void resize_peers(IVShmemState *s, int nb_peers)
 424 {
 425     int old_nb_peers = s->nb_peers;
 426     int i;
 427
 428     assert(nb_peers > old_nb_peers);
 429     IVSHMEM_DPRINTF("bumping storage to %d peers\n", nb_peers);
 430
 431     s->peers = g_realloc(s->peers, nb_peers * sizeof(Peer));
 432     s->nb_peers = nb_peers;
 433
 434     for (i = old_nb_peers; i < nb_peers; i++) {
 435         s->peers[i].eventfds = g_new0(EventNotifier, s->vectors);
 436         s->peers[i].nb_eventfds = 0;
 437     }
 438 }
 439
 440 static void ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector,
 441                                      Error **errp)
 442 {
 443     PCIDevice *pdev = PCI_DEVICE(s);
 444     MSIMessage msg = msix_get_message(pdev, vector);
 445     int ret;
 446
 447     IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector);
 448     assert(!s->msi_vectors[vector].pdev);
 449
 450     ret = kvm_irqchip_add_msi_route(kvm_state, msg, pdev);
 451     if (ret < 0) {
 452         error_setg(errp, "kvm_irqchip_add_msi_route failed");
 453         return;
 454     }
 455
 456     s->msi_vectors[vector].virq = ret;
 457     s->msi_vectors[vector].pdev = pdev;
 458 }
 459
 460 static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
 461 {
 462     EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
 463     bool with_irqfd = kvm_msi_via_irqfd_enabled() &&
 464         ivshmem_has_feature(s, IVSHMEM_MSI);
 465     PCIDevice *pdev = PCI_DEVICE(s);
 466     Error *err = NULL;
 467
 468     IVSHMEM_DPRINTF("setting up interrupt for vector: %d\n", vector);
 469
 470     if (!with_irqfd) {
 471         IVSHMEM_DPRINTF("with eventfd\n");
 472         watch_vector_notifier(s, n, vector);
 473     } else if (msix_enabled(pdev)) {
 474         IVSHMEM_DPRINTF("with irqfd\n");
 475         ivshmem_add_kvm_msi_virq(s, vector, &err);
 476         if (err) {
 477             error_propagate(errp, err);
 478             return;
 479         }
 480
 481         if (!msix_is_masked(pdev, vector)) {
 482             kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL,
 483                                                s->msi_vectors[vector].virq);
 484             /* TODO handle error */
 485         }
 486     } else {
 487         /* it will be delayed until msix is enabled, in write_config */
 488         IVSHMEM_DPRINTF("with irqfd, delayed until msix enabled\n");
 489     }
 490 }
 491
 492 static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
 493 {
 494     struct stat buf;
 495     size_t size;
 496     void *ptr;
 497
 498     if (s->ivshmem_bar2) {
 499         error_setg(errp, "server sent unexpected shared memory message");
 500         close(fd);
 501         return;
 502     }
 503
 504     if (fstat(fd, &buf) < 0) {
 505         error_setg_errno(errp, errno,
 506             "can't determine size of shared memory sent by server");
 507         close(fd);
 508         return;
 509     }
 510
 511     size = buf.st_size;
 512
 513     /* Legacy cruft */
 514     if (s->legacy_size != SIZE_MAX) {
 515         if (size < s->legacy_size) {
 516             error_setg(errp, "server sent only %zd bytes of shared memory",
 517                        (size_t)buf.st_size);
 518             close(fd);
 519             return;
 520         }
 521         size = s->legacy_size;
 522     }
 523
 524     /* mmap the region and map into the BAR2 */
 525     ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 526     if (ptr == MAP_FAILED) {
 527         error_setg_errno(errp, errno, "Failed to mmap shared memory");
 528         close(fd);
 529         return;
 530     }
 531     memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
 532                                "ivshmem.bar2", size, ptr);
 533     memory_region_set_fd(&s->server_bar2, fd);
 534     s->ivshmem_bar2 = &s->server_bar2;
 535 }
 536
 537 static void process_msg_disconnect(IVShmemState *s, uint16_t posn,
 538                                    Error **errp)
 539 {
 540     IVSHMEM_DPRINTF("posn %d has gone away\n", posn);
 541     if (posn >= s->nb_peers || posn == s->vm_id) {
 542         error_setg(errp, "invalid peer %d", posn);
 543         return;
 544     }
 545     close_peer_eventfds(s, posn);
 546 }
 547
 548 static void process_msg_connect(IVShmemState *s, uint16_t posn, int fd,
 549                                 Error **errp)
 550 {
 551     Peer *peer = &s->peers[posn];
 552     int vector;
 553
 554     /*
 555      * The N-th connect message for this peer comes with the file
 556      * descriptor for vector N-1.  Count messages to find the vector.
 557      */
 558     if (peer->nb_eventfds >= s->vectors) {
 559         error_setg(errp, "Too many eventfd received, device has %d vectors",
 560                    s->vectors);
 561         close(fd);
 562         return;
 563     }
 564     vector = peer->nb_eventfds++;
 565
 566     IVSHMEM_DPRINTF("eventfds[%d][%d] = %d\n", posn, vector, fd);
 567     event_notifier_init_fd(&peer->eventfds[vector], fd);
 568     fcntl_setfl(fd, O_NONBLOCK); /* msix/irqfd poll non block */
 569
 570     if (posn == s->vm_id) {
 571         setup_interrupt(s, vector, errp);
 572         /* TODO do we need to handle the error? */
 573     }
 574
 575     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 576         ivshmem_add_eventfd(s, posn, vector);
 577     }
 578 }
 579
 580 static void process_msg(IVShmemState *s, int64_t msg, int fd, Error **errp)
 581 {
 582     IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
 583
 584     if (msg < -1 || msg > IVSHMEM_MAX_PEERS) {
 585         error_setg(errp, "server sent invalid message %" PRId64, msg);
 586         close(fd);
 587         return;
 588     }
 589
 590     if (msg == -1) {
 591         process_msg_shmem(s, fd, errp);
 592         return;
 593     }
 594
 595     if (msg >= s->nb_peers) {
 596         resize_peers(s, msg + 1);
 597     }
 598
 599     if (fd >= 0) {
 600         process_msg_connect(s, msg, fd, errp);
 601     } else {
 602         process_msg_disconnect(s, msg, errp);
 603     }
 604 }
 605
 606 static int ivshmem_can_receive(void *opaque)
 607 {
 608     IVShmemState *s = opaque;
 609
 610     assert(s->msg_buffered_bytes < sizeof(s->msg_buf));
 611     return sizeof(s->msg_buf) - s->msg_buffered_bytes;
 612 }
 613
 614 static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
 615 {
 616     IVShmemState *s = opaque;
 617     Error *err = NULL;
 618     int fd;
 619     int64_t msg;
 620
 621     assert(size >= 0 && s->msg_buffered_bytes + size <= sizeof(s->msg_buf));
 622     memcpy((unsigned char *)&s->msg_buf + s->msg_buffered_bytes, buf, size);
 623     s->msg_buffered_bytes += size;
 624     if (s->msg_buffered_bytes < sizeof(s->msg_buf)) {
 625         return;
 626     }
 627     msg = le64_to_cpu(s->msg_buf);
 628     s->msg_buffered_bytes = 0;
 629
 630     fd = qemu_chr_fe_get_msgfd(s->server_chr);
 631     IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
 632
 633     process_msg(s, msg, fd, &err);
 634     if (err) {
 635         error_report_err(err);
 636     }
 637 }
 638
 639 static int64_t ivshmem_recv_msg(IVShmemState *s, int *pfd, Error **errp)
 640 {
 641     int64_t msg;
 642     int n, ret;
 643
 644     n = 0;
 645     do {
 646         ret = qemu_chr_fe_read_all(s->server_chr, (uint8_t *)&msg + n,
 647                                  sizeof(msg) - n);
 648         if (ret < 0 && ret != -EINTR) {
 649             error_setg_errno(errp, -ret, "read from server failed");
 650             return INT64_MIN;
 651         }
 652         n += ret;
 653     } while (n < sizeof(msg));
 654
 655     *pfd = qemu_chr_fe_get_msgfd(s->server_chr);
 656     return msg;
 657 }
 658
 659 static void ivshmem_recv_setup(IVShmemState *s, Error **errp)
 660 {
 661     Error *err = NULL;
 662     int64_t msg;
 663     int fd;
 664
 665     msg = ivshmem_recv_msg(s, &fd, &err);
 666     if (err) {
 667         error_propagate(errp, err);
 668         return;
 669     }
 670     if (msg != IVSHMEM_PROTOCOL_VERSION) {
 671         error_setg(errp, "server sent version %" PRId64 ", expecting %d",
 672                    msg, IVSHMEM_PROTOCOL_VERSION);
 673         return;
 674     }
 675     if (fd != -1) {
 676         error_setg(errp, "server sent invalid version message");
 677         return;
 678     }
 679
 680     /*
 681      * ivshmem-server sends the remaining initial messages in a fixed
 682      * order, but the device has always accepted them in any order.
 683      * Stay as compatible as practical, just in case people use
 684      * servers that behave differently.
 685      */
 686
 687     /*
 688      * ivshmem_device_spec.txt has always required the ID message
 689      * right here, and ivshmem-server has always complied.  However,
 690      * older versions of the device accepted it out of order, but
 691      * broke when an interrupt setup message arrived before it.
 692      */
 693     msg = ivshmem_recv_msg(s, &fd, &err);
 694     if (err) {
 695         error_propagate(errp, err);
 696         return;
 697     }
 698     if (fd != -1 || msg < 0 || msg > IVSHMEM_MAX_PEERS) {
 699         error_setg(errp, "server sent invalid ID message");
 700         return;
 701     }
 702     s->vm_id = msg;
 703
 704     /*
 705      * Receive more messages until we got shared memory.
 706      */
 707     do {
 708         msg = ivshmem_recv_msg(s, &fd, &err);
 709         if (err) {
 710             error_propagate(errp, err);
 711             return;
 712         }
 713         process_msg(s, msg, fd, &err);
 714         if (err) {
 715             error_propagate(errp, err);
 716             return;
 717         }
 718     } while (msg != -1);
 719
 720     /*
 721      * This function must either map the shared memory or fail.  The
 722      * loop above ensures that: it terminates normally only after it
 723      * successfully processed the server's shared memory message.
 724      * Assert that actually mapped the shared memory:
 725      */
 726     assert(s->ivshmem_bar2);
 727 }
 728
 729 /* Select the MSI-X vectors used by device.
 730  * ivshmem maps events to vectors statically, so
 731  * we just enable all vectors on init and after reset. */
 732 static void ivshmem_msix_vector_use(IVShmemState *s)
 733 {
 734     PCIDevice *d = PCI_DEVICE(s);
 735     int i;
 736
 737     for (i = 0; i < s->vectors; i++) {
 738         msix_vector_use(d, i);
 739     }
 740 }
 741
 742 static void ivshmem_reset(DeviceState *d)
 743 {
 744     IVShmemState *s = IVSHMEM_COMMON(d);
 745
 746     s->intrstatus = 0;
 747     s->intrmask = 0;
 748     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 749         ivshmem_msix_vector_use(s);
 750     }
 751 }
 752
 753 static int ivshmem_setup_interrupts(IVShmemState *s)
 754 {
 755     /* allocate QEMU callback data for receiving interrupts */
 756     s->msi_vectors = g_malloc0(s->vectors * sizeof(MSIVector));
 757
 758     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 759         if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
 760             return -1;
 761         }
 762
 763         IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
 764         ivshmem_msix_vector_use(s);
 765     }
 766
 767     return 0;
 768 }
 769
 770 static void ivshmem_enable_irqfd(IVShmemState *s)
 771 {
 772     PCIDevice *pdev = PCI_DEVICE(s);
 773     int i;
 774
 775     for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
 776         Error *err = NULL;
 777
 778         ivshmem_add_kvm_msi_virq(s, i, &err);
 779         if (err) {
 780             error_report_err(err);
 781             /* TODO do we need to handle the error? */
 782         }
 783     }
 784
 785     if (msix_set_vector_notifiers(pdev,
 786                                   ivshmem_vector_unmask,
 787                                   ivshmem_vector_mask,
 788                                   ivshmem_vector_poll)) {
 789         error_report("ivshmem: msix_set_vector_notifiers failed");
 790     }
 791 }
 792
 793 static void ivshmem_remove_kvm_msi_virq(IVShmemState *s, int vector)
 794 {
 795     IVSHMEM_DPRINTF("ivshmem_remove_kvm_msi_virq vector:%d\n", vector);
 796
 797     if (s->msi_vectors[vector].pdev == NULL) {
 798         return;
 799     }
 800
 801     /* it was cleaned when masked in the frontend. */
 802     kvm_irqchip_release_virq(kvm_state, s->msi_vectors[vector].virq);
 803
 804     s->msi_vectors[vector].pdev = NULL;
 805 }
 806
 807 static void ivshmem_disable_irqfd(IVShmemState *s)
 808 {
 809     PCIDevice *pdev = PCI_DEVICE(s);
 810     int i;
 811
 812     for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
 813         ivshmem_remove_kvm_msi_virq(s, i);
 814     }
 815
 816     msix_unset_vector_notifiers(pdev);
 817 }
 818
 819 static void ivshmem_write_config(PCIDevice *pdev, uint32_t address,
 820                                  uint32_t val, int len)
 821 {
 822     IVShmemState *s = IVSHMEM_COMMON(pdev);
 823     int is_enabled, was_enabled = msix_enabled(pdev);
 824
 825     pci_default_write_config(pdev, address, val, len);
 826     is_enabled = msix_enabled(pdev);
 827
 828     if (kvm_msi_via_irqfd_enabled()) {
 829         if (!was_enabled && is_enabled) {
 830             ivshmem_enable_irqfd(s);
 831         } else if (was_enabled && !is_enabled) {
 832             ivshmem_disable_irqfd(s);
 833         }
 834     }
 835 }
 836
 837 static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
 838 {
 839     IVShmemState *s = IVSHMEM_COMMON(dev);
 840     Error *err = NULL;
 841     uint8_t *pci_conf;
 842     uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
 843         PCI_BASE_ADDRESS_MEM_PREFETCH;
 844
 845     /* IRQFD requires MSI */
 846     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
 847         !ivshmem_has_feature(s, IVSHMEM_MSI)) {
 848         error_setg(errp, "ioeventfd/irqfd requires MSI");
 849         return;
 850     }
 851
 852     pci_conf = dev->config;
 853     pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 854
 855     memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s,
 856                           "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
 857
 858     /* region for registers*/
 859     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
 860                      &s->ivshmem_mmio);
 861
 862     if (!s->not_legacy_32bit) {
 863         attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
 864     }
 865
 866     if (s->hostmem != NULL) {
 867         IVSHMEM_DPRINTF("using hostmem\n");
 868
 869         s->ivshmem_bar2 = host_memory_backend_get_memory(s->hostmem,
 870                                                          &error_abort);
 871     } else {
 872         assert(s->server_chr);
 873
 874         IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
 875                         s->server_chr->filename);
 876
 877         /* we allocate enough space for 16 peers and grow as needed */
 878         resize_peers(s, 16);
 879
 880         /*
 881          * Receive setup messages from server synchronously.
 882          * Older versions did it asynchronously, but that creates a
 883          * number of entertaining race conditions.
 884          */
 885         ivshmem_recv_setup(s, &err);
 886         if (err) {
 887             error_propagate(errp, err);
 888             return;
 889         }
 890
 891         if (s->master == ON_OFF_AUTO_ON && s->vm_id != 0) {
 892             error_setg(errp,
 893                        "master must connect to the server before any peers");
 894             return;
 895         }
 896
 897         qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive,
 898                               ivshmem_read, NULL, s);
 899
 900         if (ivshmem_setup_interrupts(s) < 0) {
 901             error_setg(errp, "failed to initialize interrupts");
 902             return;
 903         }
 904     }
 905
 906     vmstate_register_ram(s->ivshmem_bar2, DEVICE(s));
 907     pci_register_bar(PCI_DEVICE(s), 2, attr, s->ivshmem_bar2);
 908
 909     if (s->master == ON_OFF_AUTO_AUTO) {
 910         s->master = s->vm_id == 0 ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
 911     }
 912
 913     if (!ivshmem_is_master(s)) {
 914         error_setg(&s->migration_blocker,
 915                    "Migration is disabled when using feature 'peer mode' in device 'ivshmem'");
 916         migrate_add_blocker(s->migration_blocker);
 917     }
 918 }
 919
 920 static void ivshmem_exit(PCIDevice *dev)
 921 {
 922     IVShmemState *s = IVSHMEM_COMMON(dev);
 923     int i;
 924
 925     if (s->migration_blocker) {
 926         migrate_del_blocker(s->migration_blocker);
 927         error_free(s->migration_blocker);
 928     }
 929
 930     if (memory_region_is_mapped(s->ivshmem_bar2)) {
 931         if (!s->hostmem) {
 932             void *addr = memory_region_get_ram_ptr(s->ivshmem_bar2);
 933             int fd;
 934
 935             if (munmap(addr, memory_region_size(s->ivshmem_bar2) == -1)) {
 936                 error_report("Failed to munmap shared memory %s",
 937                              strerror(errno));
 938             }
 939
 940             fd = memory_region_get_fd(s->ivshmem_bar2);
 941             close(fd);
 942         }
 943
 944         vmstate_unregister_ram(s->ivshmem_bar2, DEVICE(dev));
 945     }
 946
 947     if (s->peers) {
 948         for (i = 0; i < s->nb_peers; i++) {
 949             close_peer_eventfds(s, i);
 950         }
 951         g_free(s->peers);
 952     }
 953
 954     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 955         msix_uninit_exclusive_bar(dev);
 956     }
 957
 958     g_free(s->msi_vectors);
 959 }
 960
 961 static int ivshmem_pre_load(void *opaque)
 962 {
 963     IVShmemState *s = opaque;
 964
 965     if (!ivshmem_is_master(s)) {
 966         error_report("'peer' devices are not migratable");
 967         return -EINVAL;
 968     }
 969
 970     return 0;
 971 }
 972
 973 static int ivshmem_post_load(void *opaque, int version_id)
 974 {
 975     IVShmemState *s = opaque;
 976
 977     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 978         ivshmem_msix_vector_use(s);
 979     }
 980     return 0;
 981 }
 982
 983 static void ivshmem_common_class_init(ObjectClass *klass, void *data)
 984 {
 985     DeviceClass *dc = DEVICE_CLASS(klass);
 986     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 987
 988     k->realize = ivshmem_common_realize;
 989     k->exit = ivshmem_exit;
 990     k->config_write = ivshmem_write_config;
 991     k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
 992     k->device_id = PCI_DEVICE_ID_IVSHMEM;
 993     k->class_id = PCI_CLASS_MEMORY_RAM;
 994     k->revision = 1;
 995     dc->reset = ivshmem_reset;
 996     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 997     dc->desc = "Inter-VM shared memory";
 998 }
 999
1000 static const TypeInfo ivshmem_common_info = {
1001     .name          = TYPE_IVSHMEM_COMMON,
1002     .parent        = TYPE_PCI_DEVICE,
1003     .instance_size = sizeof(IVShmemState),
1004     .abstract      = true,
1005     .class_init    = ivshmem_common_class_init,
1006 };
1007
1008 static void ivshmem_check_memdev_is_busy(Object *obj, const char *name,
1009                                          Object *val, Error **errp)
1010 {
1011     if (host_memory_backend_is_mapped(MEMORY_BACKEND(val))) {
1012         char *path = object_get_canonical_path_component(val);
1013         error_setg(errp, "can't use already busy memdev: %s", path);
1014         g_free(path);
1015     } else {
1016         qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
1017     }
1018 }
1019
1020 static const VMStateDescription ivshmem_plain_vmsd = {
1021     .name = TYPE_IVSHMEM_PLAIN,
1022     .version_id = 0,
1023     .minimum_version_id = 0,
1024     .pre_load = ivshmem_pre_load,
1025     .post_load = ivshmem_post_load,
1026     .fields = (VMStateField[]) {
1027         VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
1028         VMSTATE_UINT32(intrstatus, IVShmemState),
1029         VMSTATE_UINT32(intrmask, IVShmemState),
1030         VMSTATE_END_OF_LIST()
1031     },
1032 };
1033
1034 static Property ivshmem_plain_properties[] = {
1035     DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
1036     DEFINE_PROP_END_OF_LIST(),
1037 };
1038
1039 static void ivshmem_plain_init(Object *obj)
1040 {
1041     IVShmemState *s = IVSHMEM_PLAIN(obj);
1042
1043     object_property_add_link(obj, "memdev", TYPE_MEMORY_BACKEND,
1044                              (Object **)&s->hostmem,
1045                              ivshmem_check_memdev_is_busy,
1046                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
1047                              &error_abort);
1048 }
1049
1050 static void ivshmem_plain_realize(PCIDevice *dev, Error **errp)
1051 {
1052     IVShmemState *s = IVSHMEM_COMMON(dev);
1053
1054     if (!s->hostmem) {
1055         error_setg(errp, "You must specify a 'memdev'");
1056         return;
1057     }
1058
1059     ivshmem_common_realize(dev, errp);
1060     host_memory_backend_set_mapped(s->hostmem, true);
1061 }
1062
1063 static void ivshmem_plain_exit(PCIDevice *pci_dev)
1064 {
1065     IVShmemState *s = IVSHMEM_COMMON(pci_dev);
1066
1067     host_memory_backend_set_mapped(s->hostmem, false);
1068 }
1069
1070 static void ivshmem_plain_class_init(ObjectClass *klass, void *data)
1071 {
1072     DeviceClass *dc = DEVICE_CLASS(klass);
1073     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1074
1075     k->realize = ivshmem_plain_realize;
1076     k->exit = ivshmem_plain_exit;
1077     dc->props = ivshmem_plain_properties;
1078     dc->vmsd = &ivshmem_plain_vmsd;
1079 }
1080
1081 static const TypeInfo ivshmem_plain_info = {
1082     .name          = TYPE_IVSHMEM_PLAIN,
1083     .parent        = TYPE_IVSHMEM_COMMON,
1084     .instance_size = sizeof(IVShmemState),
1085     .instance_init = ivshmem_plain_init,
1086     .class_init    = ivshmem_plain_class_init,
1087 };
1088
1089 static const VMStateDescription ivshmem_doorbell_vmsd = {
1090     .name = TYPE_IVSHMEM_DOORBELL,
1091     .version_id = 0,
1092     .minimum_version_id = 0,
1093     .pre_load = ivshmem_pre_load,
1094     .post_load = ivshmem_post_load,
1095     .fields = (VMStateField[]) {
1096         VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
1097         VMSTATE_MSIX(parent_obj, IVShmemState),
1098         VMSTATE_UINT32(intrstatus, IVShmemState),
1099         VMSTATE_UINT32(intrmask, IVShmemState),
1100         VMSTATE_END_OF_LIST()
1101     },
1102 };
1103
1104 static Property ivshmem_doorbell_properties[] = {
1105     DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
1106     DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
1107     DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
1108                     true),
1109     DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
1110     DEFINE_PROP_END_OF_LIST(),
1111 };
1112
1113 static void ivshmem_doorbell_init(Object *obj)
1114 {
1115     IVShmemState *s = IVSHMEM_DOORBELL(obj);
1116
1117     s->features |= (1 << IVSHMEM_MSI);
1118     s->legacy_size = SIZE_MAX;  /* whatever the server sends */
1119 }
1120
1121 static void ivshmem_doorbell_realize(PCIDevice *dev, Error **errp)
1122 {
1123     IVShmemState *s = IVSHMEM_COMMON(dev);
1124
1125     if (!s->server_chr) {
1126         error_setg(errp, "You must specify a 'chardev'");
1127         return;
1128     }
1129
1130     ivshmem_common_realize(dev, errp);
1131 }
1132
1133 static void ivshmem_doorbell_class_init(ObjectClass *klass, void *data)
1134 {
1135     DeviceClass *dc = DEVICE_CLASS(klass);
1136     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1137
1138     k->realize = ivshmem_doorbell_realize;
1139     dc->props = ivshmem_doorbell_properties;
1140     dc->vmsd = &ivshmem_doorbell_vmsd;
1141 }
1142
1143 static const TypeInfo ivshmem_doorbell_info = {
1144     .name          = TYPE_IVSHMEM_DOORBELL,
1145     .parent        = TYPE_IVSHMEM_COMMON,
1146     .instance_size = sizeof(IVShmemState),
1147     .instance_init = ivshmem_doorbell_init,
1148     .class_init    = ivshmem_doorbell_class_init,
1149 };
1150
1151 static int ivshmem_load_old(QEMUFile *f, void *opaque, int version_id)
1152 {
1153     IVShmemState *s = opaque;
1154     PCIDevice *pdev = PCI_DEVICE(s);
1155     int ret;
1156
1157     IVSHMEM_DPRINTF("ivshmem_load_old\n");
1158
1159     if (version_id != 0) {
1160         return -EINVAL;
1161     }
1162
1163     ret = ivshmem_pre_load(s);
1164     if (ret) {
1165         return ret;
1166     }
1167
1168     ret = pci_device_load(pdev, f);
1169     if (ret) {
1170         return ret;
1171     }
1172
1173     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
1174         msix_load(pdev, f);
1175         ivshmem_msix_vector_use(s);
1176     } else {
1177         s->intrstatus = qemu_get_be32(f);
1178         s->intrmask = qemu_get_be32(f);
1179     }
1180
1181     return 0;
1182 }
1183
1184 static bool test_msix(void *opaque, int version_id)
1185 {
1186     IVShmemState *s = opaque;
1187
1188     return ivshmem_has_feature(s, IVSHMEM_MSI);
1189 }
1190
1191 static bool test_no_msix(void *opaque, int version_id)
1192 {
1193     return !test_msix(opaque, version_id);
1194 }
1195
1196 static const VMStateDescription ivshmem_vmsd = {
1197     .name = "ivshmem",
1198     .version_id = 1,
1199     .minimum_version_id = 1,
1200     .pre_load = ivshmem_pre_load,
1201     .post_load = ivshmem_post_load,
1202     .fields = (VMStateField[]) {
1203         VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
1204
1205         VMSTATE_MSIX_TEST(parent_obj, IVShmemState, test_msix),
1206         VMSTATE_UINT32_TEST(intrstatus, IVShmemState, test_no_msix),
1207         VMSTATE_UINT32_TEST(intrmask, IVShmemState, test_no_msix),
1208
1209         VMSTATE_END_OF_LIST()
1210     },
1211     .load_state_old = ivshmem_load_old,
1212     .minimum_version_id_old = 0
1213 };
1214
1215 static Property ivshmem_properties[] = {
1216     DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
1217     DEFINE_PROP_STRING("size", IVShmemState, sizearg),
1218     DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
1219     DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
1220                     false),
1221     DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
1222     DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
1223     DEFINE_PROP_STRING("role", IVShmemState, role),
1224     DEFINE_PROP_UINT32("use64", IVShmemState, not_legacy_32bit, 1),
1225     DEFINE_PROP_END_OF_LIST(),
1226 };
1227
1228 static void desugar_shm(IVShmemState *s)
1229 {
1230     Object *obj;
1231     char *path;
1232
1233     obj = object_new("memory-backend-file");
1234     path = g_strdup_printf("/dev/shm/%s", s->shmobj);
1235     object_property_set_str(obj, path, "mem-path", &error_abort);
1236     g_free(path);
1237     object_property_set_int(obj, s->legacy_size, "size", &error_abort);
1238     object_property_set_bool(obj, true, "share", &error_abort);
1239     object_property_add_child(OBJECT(s), "internal-shm-backend", obj,
1240                               &error_abort);
1241     user_creatable_complete(obj, &error_abort);
1242     s->hostmem = MEMORY_BACKEND(obj);
1243 }
1244
1245 static void ivshmem_realize(PCIDevice *dev, Error **errp)
1246 {
1247     IVShmemState *s = IVSHMEM_COMMON(dev);
1248
1249     if (!qtest_enabled()) {
1250         error_report("ivshmem is deprecated, please use ivshmem-plain"
1251                      " or ivshmem-doorbell instead");
1252     }
1253
1254     if (!!s->server_chr + !!s->shmobj != 1) {
1255         error_setg(errp, "You must specify either 'shm' or 'chardev'");
1256         return;
1257     }
1258
1259     if (s->sizearg == NULL) {
1260         s->legacy_size = 4 << 20; /* 4 MB default */
1261     } else {
1262         char *end;
1263         int64_t size = qemu_strtosz(s->sizearg, &end);
1264         if (size < 0 || (size_t)size != size || *end != '\0'
1265             || !is_power_of_2(size)) {
1266             error_setg(errp, "Invalid size %s", s->sizearg);
1267             return;
1268         }
1269         s->legacy_size = size;
1270     }
1271
1272     /* check that role is reasonable */
1273     if (s->role) {
1274         if (strncmp(s->role, "peer", 5) == 0) {
1275             s->master = ON_OFF_AUTO_OFF;
1276         } else if (strncmp(s->role, "master", 7) == 0) {
1277             s->master = ON_OFF_AUTO_ON;
1278         } else {
1279             error_setg(errp, "'role' must be 'peer' or 'master'");
1280             return;
1281         }
1282     } else {
1283         s->master = ON_OFF_AUTO_AUTO;
1284     }
1285
1286     if (s->shmobj) {
1287         desugar_shm(s);
1288     }
1289
1290     /*
1291      * Note: we don't use INTx with IVSHMEM_MSI at all, so this is a
1292      * bald-faced lie then.  But it's a backwards compatible lie.
1293      */
1294     pci_config_set_interrupt_pin(dev->config, 1);
1295
1296     ivshmem_common_realize(dev, errp);
1297 }
1298
1299 static void ivshmem_class_init(ObjectClass *klass, void *data)
1300 {
1301     DeviceClass *dc = DEVICE_CLASS(klass);
1302     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1303
1304     k->realize = ivshmem_realize;
1305     k->revision = 0;
1306     dc->desc = "Inter-VM shared memory (legacy)";
1307     dc->props = ivshmem_properties;
1308     dc->vmsd = &ivshmem_vmsd;
1309 }
1310
1311 static const TypeInfo ivshmem_info = {
1312     .name          = TYPE_IVSHMEM,
1313     .parent        = TYPE_IVSHMEM_COMMON,
1314     .instance_size = sizeof(IVShmemState),
1315     .class_init    = ivshmem_class_init,
1316 };
1317
1318 static void ivshmem_register_types(void)
1319 {
1320     type_register_static(&ivshmem_common_info);
1321     type_register_static(&ivshmem_plain_info);
1322     type_register_static(&ivshmem_doorbell_info);
1323     type_register_static(&ivshmem_info);
1324 }
1325
1326 type_init(ivshmem_register_types)