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